Patent Application
20180043679
The present invention relates to, a printing press and method for operating a dryer device that comprises a dryer and a control device in a printing press. The printing press, in which a printing substrate can be imprinted in at least one printing point, by at least one printing unit, has a dryer device that comprises a dryer having a drying unit which is formed by an arrangement of a plurality of radiation sources arranged side by side, and extending at least across the maximum printing substrate width. The radiation sources, in the activated state thereof, can each be used for exposing the printing substrate to radiation for the purpose of drying the printing substrate. A control device is provided, by the use of which, the radiation sources or a portion thereof, are, or can be switched on and off in a repeating cycle that comprises a sequence which includes at least one active and at least one inactive phase in correlation with one of a print phase position and a printing substrate phase position. The printing press may be, in particular, a security printing press, having at least one printing unit at the printing point of which print images, having the same print image length, can be printed onto sections of a printing substrate passing through the printing point in a cycle having a fixed cycle length with respect to the printing substrate feed rate at the printing point. The printing point comprises an imaging cylinder that has a plurality of imaging printing elements or groups of imaging in printing elements on its periphery, which imaging printing elements are arranged in a plurality of columns, which are spaced equidistant from one another transversely to the direction of transport, over a circumferential length that corresponds to the print image length, and in a plurality of rows, which are spaced equidistant from one another in the direction of transport, across the cylinder width that corresponds to the print image width. A method for operating the dryer device that comprises the dryer and the control device in the printing press, in particular in the security printing press, includes the provision of the dryer with the arrangement of a plurality of radiation sources arranged side by side extending at least across the maximum printing substrate width, switching the radiation sources or a portion thereof on and off in a repeating cycle which comprises a sequence of having at least one active and at least one inactive and at least one inactive phase in correlation with the one of the press phase position and the printing substrate phase position to be applied to the control device.
EP 2025515 A1 discloses a screen printing press having a printing assembly that comprises two printing points. Each printing point is formed by a screen cylinder thrown onto an impression cylinder. A drying unit that uses UV radiation is provided in the printing substrate path between the two printing points, and can be used for at least superficially drying the ink pattern that is applied in the first printing point. A ink pattern having printed areas that directly adjoin or even overlap with the areas first printed can then be applied in the second printing point. A plurality of image elements arranged in rows and columns and comprising these two areas are thereby printed onto one printing substrate sheet, for example.
EP 1648702 B1 discloses a printing press having a printing unit that operates according to the screen printing method, in which one printing cylinder or cylinder of a conveyor line has at least one magnetic element for aligning pigments contained in the ink, and the printing substrate path comprises a dryer located downstream.
EP 2067620 B1 concerns a method for drying printed material in multicolor printing, in which drying is performed by means of a one-dimensional or two-dimensional array of radiation sources, depending on the image content. In said method, data from the prepress stage are used for controlling the light sources individually or in groups.
DE 10 2009 007873 A1 discloses a sheet-fed printing press in which a sheet imprinted with UV-curable inks is acted on by exposing a predetermined area thereof to UV light. For this purpose, the apparatus comprises a plurality of LEDs, which are arranged in predetermined zones in the transverse direction of the sheet and are switched in accordance with the location and size of predetermined areas. Individual zones can be switched on in the transverse direction based upon the width of the area of the sheet that is passing through or based upon whether an image is contained in the zone in question.
In the direction of transport, zones can be switched on based upon the leading and trailing ends of an image or based upon the spacing of a plurality of partial images spaced from one another in the longitudinal direction. The area of exposure is calculated by a corresponding calculating unit, based on data that are provided prior to the printing process.
From DE 10 2012 215491 A1 a processing machine and a method for operating the same are known, in which data relating to the subject of a job are fed to a control console, and, taking these data into account, a control device for a dryer is supplied with signals, by means of which the dryer can be activated and deactivated zonally across the format width of the printing substrate, taking the subject into account.
EP 1599340 B1 concerns the ultraviolet curing of coating compositions, in which, by way of example, in an inkjet head oscillating laterally over a printing substrate, LEDs that are moved along with the head irradiate only printed target areas for the purpose of selective drying. Control is implemented, e.g. by means of software, for example using a raster image or some other system used in the production of the printed image. In a modified variant, control of the LEDs is transferred to intermediate dryers or a final dryer of an offset printing press. Alternatively, this can also be applied to a screen printing technique, to enable the controlled drying of a printed substrate prior to a subsequent printing step.
EP 1439071 B1 concerns an inkjet printer which has a dryer that is controlled based upon a temperature or a humidity measured by a sensor.
US 2007/0206083 A1 also concerns an inkjet printer, in which the ink is cured by irradiation or some other application of energy. LEDs that are moved along with the inkjet head are used for the purpose of irradiation, with the quantity of radiation and the profile in the direction of paper transport being adjusted differently based upon the paper that is used.
DE 10 2007 040139 A1 discloses a printing press in which a dryer is positioned in a sheet-guiding drum, co-rotating therewith. The dryer can be controllable zonally in the circumferential direction and/or in the axial direction, independently of adjacent zones, and can thus be adaptable to the printed image. The zones, in a checkerboard pattern, for example, can be actuated based upon the printed image. The data for this can be taken from the prepress stage. Actuation can also be based upon operating parameters, including printed sheet parameters such as the printed sheet format.
EP 1142711 A1 discloses a controller for the dryer device of a printing press, in which the dryer device is controlled based upon variables that characterize the printing process. As one such variable, the radiation output of a UV or IR dryer can be controllable based upon the ink coverage of a printing unit upstream. In cases in which dryer devices are arranged distributed in blocks over the format width, the individual blocks can also be actuated in accordance with the ink coverage of the subject. The data concerning ink coverage to be used for this purpose can be obtained by scanning the printing plate, or preferably in the form of a data set from the digital prepress stage.
EP 2025515 A1 discloses a security printing press having two screen printing units, with one UV dryer positioned therebetween. The screen printing units can be used for applying image elements for each copy, according to a grid composed of multiple columns and rows of copies.
WO 2015/118447 A2 discloses a security printing press having a printing unit that operates according to the letterset process, and an additional screen printing unit. The printing unit that operates according to the letterset printing process can be used in its embodiment as a numbering printing unit, for example, for applying serial numbers to the copies.
EP 0949069 B1 discloses a security printing press with which, at a first printing point, a first side can be imprinted in two colors, and in a second printing point, both sides can be imprinted simultaneously in multiple colors. A UV dryer is located between the two printing points and is directed toward the side that has just been imprinted.
From EP 1466731 A1, a method and a device for drying ink on a printing substrate are known, in which an infrared absorber is applied to the printing substrate, and the printing substrate is exposed downstream to appropriately narrow-band radiation. In a refinement, the printing substrate can be acted on by a field of individual radiation sources, which are actuated such that the amount of energy input is based on the volume of printing ink previously applied.
The object of the present invention is to provide a printing press, and a method for operating a dryer device that comprises a dryer and a control device in a printing press.
The object is achieved according to the invention by the provision of the dryer device that comprises the dryer and the control device preferably being embodied and configured to switch only a portion of the radiation sources on and off collectively, per cycle, in sections, in at least four predefinable groups of radiation sources, spaced approximately equidistant from one another, and deviating no more than 20% from the average distance, transversely to the direction of transport, according to the same underlying sequence that comprises at least three active phases of the same first phase link, spaced equidistant from another, via common control means using one of the same control logic and the same switching profile. The drying unit is formed by the arrangement of a plurality of the radiation sources arranged side by side and extending at least across the maximum printing substrate width. The dryer device that comprises the dryer and the control device are embodied and configured for exposing the printing substrate that is passing through the dryer to radiation during the cycle in at least four tracks simultaneously, spaced transversely to the direction of transport, in at least three active phases that are spaced from one another by inactive phases, based on the printing substrate feed rate, collectively via a common control assembly, using one of the same control logic and the same switching profile. During the cycle, a printing substrate passing through the dryer is exposed to radiation only in a plurality of tracks that are spaced transversely to the direction of transport and clocked with respect to one of the printing substrate feed rate and the press phase. In each such cycle, only a portion of the radiation sources are switched on and off simultaneously in sections, in at least four predefined groups that are spaced approximately equidistantly from one another, and deviating no more than 20% from the average distance, transversely to the direction of transport, with one of a plurality of and at least three active phases of the same first phase lengths being spaced equidistant from one another per cycle.
The advantages to be achieved with the invention consist, in particular, in an improvement in print quality and/or less wear during printing and/or reduced energy consumption and/or reduced maintenance and cleaning effort. In this way, a particularly rapid and efficient dryer device, and printing presses that include such a rapid and efficient dryer device are created. In particular, in one advantageous embodiment or operating mode, a variable format length and/or print image length is possible, and in another embodiment or operating mode, the print image elements that are separated by longer non-printing sections can be printed, while high print quality is maintained and/or with reduced energy consumption and/or with decreased wear and/or with reduced maintenance effort. In a refinement, portions of image elements can be selectively dried and fixed, allowing an expanded production spectrum to be achieved.
In particular, an especially rapid and efficient solution for variable-length and/or selective drying is produced.
In an embodiment of a dryer device or an embodiment of a dryer device that is part of a printing press which is particularly preferred in terms of realizing the above advantages, said dryer device has a dryer with a drying means that comprises a plurality of dryer elements, which can be controlled separately and are offset from one another transversely to the direction of transport of the printing substrate, and by means of which, in the activated state thereof, a drying medium can be applied to the printing substrate for the purpose of drying the same; said dryer device also has a control device, by means of which the dryer elements, or a portion thereof, can be switched on and off in a repeating cycle that comprises a sequence having at least one active and at least one inactive phase, in correlation with the press phase position and/or the printing substrate phase position.
In a preferred solution, a dryer device for a printing press, in particular a security printing press, for printing onto a printing substrate in at least one printing point by means of at least one printing unit comprises a dryer having a drying means, which is formed by an arrangement of a plurality of radiation sources arranged side by side, extending at least across the maximum printing substrate width, which radiation sources, in the activated state thereof, can be used for exposing the printing substrate, preferably in the form of sheets, to radiation for the purpose of drying the same, and a control device, by means of which the radiation sources, or a portion thereof, are or can be switched on and off in a repeating cycle which comprises a sequence that includes at least one active and at least one inactive phase, in correlation with a press phase position and/or printing substrate phase position. The dryer device that comprises the dryer and the control device is preferably embodied and configured to switch only a portion of the radiation sources on and off, simultaneously and/or collectively, per cycle, in sections, in at least four predefinable groups of radiation sources, spaced approximately equidistant from one another, i.e. deviating no more than 10% from the average distance, transversely to the direction of transport, according to a sequence that comprises a plurality of and/or in particular at least three active phases of the same first phase length, spaced equidistant from one another.
A preferred printing press, in particular a security printing press, comprises at least one printing unit having an imaging cylinder, at the printing point of which print images of the same print image length can be printed onto sections of a printing substrate passing through the printing point, in particular sections of a printing substrate web or preferably printing substrate sheets, in a cycle that has a fixed cycle length based on the printing substrate feed rate at the printing point. The printing unit comprises an imaging cylinder having a plurality of imaging printing elements or groups of imaging printing elements, in particular of the same structure and/or configuration, on its periphery, which are arranged over a circumferential length that corresponds to the print image length in a plurality of columns spaced equidistant from one another transversely to the direction of transport, and across a cylinder width that corresponds to the print image width in a plurality of rows spaced equidistant from one another in the direction of transport. Also provided is a dryer device having a dryer that comprises an integral or multi-part drying means and is positioned downstream of the printing point in the printing substrate path, by means of which printing substrate passing through the dryer can be exposed to radiation for the purpose of drying the same. Preferably, the drying means is formed by an arrangement of a plurality of radiation sources arranged side by side and extending at least across the maximum printing substrate width. The dryer device comprising the dryer and the control device is embodied and configured to expose the printing substrate that is passing through the dryer to radiation during the cycle, in a plurality of tracks spaced approximately equidistant from one another, i.e. deviating no more than 10% from the average distance, transversely to the direction of transport, simultaneously in a plurality of and/or in particular three active phases, which are spaced equidistant from one another by inactive phases based on the printing substrate feed rate.
During operation of a dryer device that comprises a dryer and a control device in a printing press, in particular a security printing press, in which the dryer comprises an arrangement of a plurality of radiation sources arranged side by side and extending at least across the maximum printing substrate width as drying means, the radiation sources, or a portion thereof, are switched on and off in a repeating cycle that comprises a sequence having at least one active and at least one inactive phase, in correlation with a press phase position and/or printing substrate phase position to be supplied to the control device. In each cycle, printing substrate passing through the dryer is exposed to radiation in only a plurality of tracks spaced transversely to the direction of transport, in clocked manner based on the printing substrate feed rate and/or the press phase, in that in each cycle, only a portion of the radiation sources are switched on and off, simultaneously and/or collectively, in sections, in a plurality of predefined and/or predefinable groups, in particular at least four, which are spaced approximately equidistant from one another, i.e. deviating no more than 20% from the average distance, transversely to the direction of transport, according to the same sequence on which the control is based, said sequence having at least three active phases of the same first phase length, spaced equidistant from one another. Particularly in conjunction with the capability for processing a variable printing substrate format—especially during screen printing, with the normally greater ink thicknesses and/or the risk of soiling the impression surface with ink that passes in minute amounts even through areas of the screen not intended for printing—it is a particular advantage that drying is carried out only in areas in which printing has taken place according to plan. This applies similarly to the printing of relatively small image elements in letterset printing, e.g. during numbering.
Features that refine the aforementioned preferred embodiments and methods, as described in the following and/or in reference to embodiment examples and/or in the features of the dependent claims, may be applied individually or in multiples to form an advantageous refinement.
In one possible refinement of the aforementioned solution, the position and/or length of the repeating switching-on and switching-off sequence can be synchronized overall with a master axis encoder or preferably directly with signals of a sensor system that detects the press phase and/or the advancement of the printing substrate.
In an advantageous refinement of the security printing press, in particular a security printing press having at least one printing unit, at the printing point of which a print image of a certain print image length can be printed onto each of a number of sections of a printing substrate passing through the printing point, in a cycle that has a fixed cycle length based on the printing substrate feed rate at the printing point, and having a dryer device that has a dryer positioned downstream of the printing point in the printing substrate path and comprising an integral or multi-part drying means, by means of which printing substrate passing through the dryer can be exposed to radiation for the purpose of drying the same in at least one track extending in the direction of transport of the printing substrate, and a control device for controlling the operation of the dryer, a user interface with control elements is provided, which is connected to the control device and can be used by operators to configure the dryer device with respect to the lateral position and/or width of at least one track to be acted on by the dryer.
With the configuration of the dryer device in a security printing press, in particular a security printing press having at least one printing unit, at the printing point of which a print image, more particularly precisely one print image, of a certain print image length can be printed onto each of a number of sections of a printing substrate, more particularly printing substrate sheets, passing through the printing point, in a cycle that has a fixed cycle length based on the printing substrate feed rate at the printing point, wherein the dryer device has a dryer positioned downstream of the printing point in the printing substrate path and comprising an integral or multi-part drying means, by means of which printing substrate passing through the dryer can be exposed to radiation for the purpose of drying the same, in at least one track extending in the direction of transport of the printing substrate, and having a control device for controlling the operation of the dryer, the dryer device is configured at a user interface for an ongoing or pending production run with respect to the lateral position and/or width of the at least one track to be acted on by the dryer.
In addition to or in place of the aforementioned user interface, in another advantageous refinement of the security printing press, in particular a security printing press having at least one printing unit, at the printing point of which a print image of a certain print image length can be printed onto each of a number of sections of a printing substrate passing through the printing point, in a cycle that has a fixed cycle length based on the printing substrate feed rate at the printing point, and having a dryer device that has a dryer positioned downstream of the printing point in the printing substrate path and comprising an integral or multi-part drying means, by means of which printing substrate passing through the dryer can be exposed to radiation for the purpose of drying the same in at least one track extending in the direction of transport of the printing substrate, and having a control device for controlling the operation of the dryer, a device for image detection and/or image analysis, which is connected in terms of signal transmission to the control device, can be provided in the printing substrate path, and can be used for supplying the control device with positional and/or dimensional data, i.e. data specifying or representing a position and/or dimension, or information that contains these data, about image elements or image element groups that are applied upstream to the printing substrate.
With the configuration of the dryer device in a security printing press, in particular a security printing press having at least one printing unit, at the printing point of which a print image, more particularly precisely one print image, of a certain print image length can be printed onto each of a number of sections of a printing substrate, more particularly printing substrate sheets, passing through the printing point, in a cycle that has a fixed cycle length based on the printing substrate feed rate at the printing point, wherein the dryer device has a dryer positioned downstream of the printing point in the printing substrate path and comprising an integral or multi-part drying means, by means of which printing substrate passing through the dryer can be exposed to radiation for the purpose of drying the same, in at least one track extending in the direction of transport of the printing substrate, and having a control device for controlling the operation of the dryer, the dryer device is configured for an ongoing or pending production run with respect to the lateral position and/or width of the at least one track to be acted on by the dryer in that—at least inter alia—the lateral position and/or width are adjusted and/or modified using data underlying a device for image detection and/or analysis or originating therefrom, in particular data regarding the position and/or dimension of image elements.
Exemplary embodiments of the present invention are illustrated in the set of drawings and will be detailed in the following.
The drawings show:
A printing press preferably embodied, e.g. as a sheet-fed printing press or optionally as a web-fed printing press comprises on the intake side an infeed device 01 that supplies the printing press with a sheet-type or web-type printing substrate 02, at least one printing assembly 03 that prints on the printing substrate 02 one or more times on one side or on both sides, and a product delivery unit 04 where printed products or intermediate products are delivered in stacks or continuously, or are wound onto a roll (see, e.g.
In a preferred embodiment shown in the figures, the printing press is embodied as a printing press for printing securities, for example for printing on web-type printing substrate 02, e.g. a printing substrate web, or preferably for printing on sheet-type printing substrate 02, e.g. printing substrate sheets 02. Infeed device 01 for the latter embodiment is configured, e.g. as a sheet feeder 01, in which a stack of printing substrate sheets 02 to be fed in and printed can be held. The term “security printing” is intended in particular to mean the printing of, e.g. banknotes or other security-relevant documents that are equipped with one or more security features and/or are produced on security paper.
The printing press is embodied as a web-fed, or preferably as a sheet-fed printing press, preferably for the printing of securities, and configured, e.g. for producing, in one embodiment from as yet unprinted printing substrate 02, or in another embodiment from already printed printing substrate, e.g. printing substrate sheets 02, in particular security webs or more particularly, security sheets, e.g. webs or more particularly, sheets containing banknotes or other security-relevant documents as products or as intermediate products to be further processed.
In a first embodiment, which is advantageous in particular for security printing, said press is embodied as a printing press that operates—at least i.a.—according to a silkscreen and/or letterpress printing process, but in particular as a postpress machine, with which a printing substrate 02 that has already been imprinted with a grid of copies—upstream inline, or more particularly offline—is and/or can be imprinted with at least one security feature per copy and/or with an identifier that individualizes the copy in question, in a silkscreen or letterpress process.
In another described embodiment which is likewise advantageous for security printing, it is embodied for printing, particularly in a multicolor process, on a printing substrate 02, in particular a security paper, at a plurality of printing points, one behind the other in the printing substrate path, at least at one printing point on each of the two sides.
In principle, printing assembly 03 of the printing press embodied, e.g. as a security printing press, can be configured as a printing assembly 03 that is based on any printing process and has at least one printing point 06; 07; 06′; 07′, e.g. as based on a letterpress process, a gravure printing process, an offset process, a screen printing process, or a plurality of the aforementioned processes in succession. In a first described embodiment, however, printing assembly 03 is embodied for printing on the printing substrate in a silkscreen or a letterpress printing process. In a described and preferred example, printing assembly 03 is configured to print on printing substrate 02 in the area of at least one printing point 06; 07 onto at least one side of the printing substrate in a screen printing process, in particular rotary screen printing. In another example, e.g. depicted schematically in
In a third embodiment, print images having a shorter print image length in relation to the cycle length can be printed onto printing substrate 02 on at least a first of its two sides at a first printing point 06″ and on at least the second of its sides at a second printing point 07″, which is the next closest downstream, in the same cycle. An additional printing point can be located upstream of said first and second printing points.
Printing substrate 02, to be printed on, e.g. in the screen printing or letterset process, is preferably embodied as printing substrate sheets 02 and/or as printing substrate 02 that has already been printed on in another printing process, and/or as security paper comprising, e.g. textile, linen, hemp and/or synthetic fibers, e.g. plastic substrates (polymer substrates) or hybrid substrates.
In the embodiment of the printing press as a sheet-fed printing press, printing substrate sheets 02 are held in reserve, e.g. as layers of a printing substrate stack, in the infeed device 01 embodied as a sheet feeder 01, from which they are picked up individually, e.g. by means of a gripper device 08 comprising suction cups, which is not shown in detail, and are conveyed separately along a conveyor line 09, e.g. along a conveyor system 09, preferably configured as a belt system 09, and, where appropriate, an infeed drum up to an intake area of printing assembly 03. At the intake into printing assembly 03, for example at a transfer drum 11, printing substrate sheet 02 is transferred to a conveyor line assigned to printing assembly 03, e.g. to a conveyor system assigned to printing assembly 03, along the transport path of which printing substrate sheet 02 passes through one or more printing points 06; 07, before entering a third, integral or multi-part conveyor line 13—for example, via a receiving drum 12—from the conveyor line assigned to printing assembly 03, or before being transferred to a third conveyor line 13, e.g. a belt system 13, and transported by said conveyor line to product delivery unit 04, e.g. a product delivery unit 04 comprising one or more sheet delivery units for stacking.
In the case of a web-processing embodiment of the printing press, in the area of printing assembly 03 the web-type printing substrate 02 passes along a conveyor line that comprises one or more rollers and/or cylinders wrapped by the web.
In the preferred embodiment of the printing press as a sheet-processing printing press, the conveyor line assigned to printing assembly 03 is preferably configured as a gripper system, in which printing substrate sheet 02 is conveyed by successive transfers between a plurality of drums and/or cylinders, one after the other in the direction of transport along the transport path through printing assembly 03. At the end of the conveyor line configured, e.g. as a gripper system, printing substrate sheet 02 is delivered to the third conveyor line 13.
In the first embodiment, on at least one side of the conveyor line, printing assembly 03; 03′ comprises at least one printing point 06; 06′, with which one of the sides of printing substrate 02 is or can be printed. Printing point 06′ can be formed by a nip point 06; 06′ between two rotary bodies 18; 21, e.g. a nip point 06; 06′ between a cylinder 18 of a first printing unit 19; 19′ and a cylinder 21 that serves as the counter bearing for said cylinder 18, e.g. an impression cylinder and/or transport cylinder 21.
Downstream of said at least one first printing point 06; 06′ in the printing substrate path of printing substrate 02, more particularly in the conveyor line that follows downstream of printing point 06; 06′ through printing assembly 03; 03′, a first rotary body 22 can be positioned downstream of printing point 06; 06′ in the printing substrate path, in physical contact with the printing substrate side that has been printed on in the at least one printing point 06; 06′. This rotary body 22, which cooperates with the freshly printed side of the printing substrate, can be embodied, e.g. as a guide roller and/or transport roller in the conveyor system, as a conditioning roller for cooling or heating the printing substrate, or as a cylinder 22 of a printing unit 23; 23′ that follows the former printing unit 19; 19′, in particular forming an additional printing point 07; 07′.
A second printing point 07; 07′ of this type can thereby be formed by a nip point 07′ between cylinder 22 of the second printing unit 23; 23′ and a cylinder that acts as a counter bearing, which is formed, e.g. by the cylinder 21 that serves first printing unit 19; 19′ as an impression cylinder and/or transport cylinder 21, or by an additional cylinder, different therefrom, that acts as an impression cylinder and/or transport cylinder. One or more additional printing units of this type that act on this same side of the printing substrate, and/or one or more additional printing units that act on the other side of the printing substrate can also be provided upstream or downstream in the printing substrate path of the printing press and/or of printing assembly 03.
In the printing substrate path, downstream of the at least one printing point 06; 07; 06′; 07′, at least one dryer device comprising a dryer 14; 16; 36 is provided, by means of which printing fluid applied to printing substrate 02, e.g. printing ink, varnish or other coating media, is or can be at least superficially dried. Such a dryer device can be provided between a printing unit 19 and a downstream rotary body 22 that cooperates with the freshly printed printing substrate side, e.g. as an intermediate drying device between printing unit 19; 19′ and the downstream printing unit 23; 23′, and can comprise a dryer 36 directed toward the printing substrate path. In place of or preferably in addition to this, at least one dryer device can be located in the printing substrate path downstream of the sole or last printing unit 19; 19′; 23; 23′, i.e. printing assembly 03; 03′, and can comprise a dryer 14; 16 directed toward the printing substrate path.
In the printing substrate path between two printing units 19; 19′; 23; 23′ or in the printing substrate path downstream of the last printing unit 19; 19′; 23; 23′ of printing assembly 03; 03′, a conditioning device 17 that varies the optical impression of the applied printing fluid—particularly in the incompletely dried state—can be provided. Said device can be embodied, for example, as a device 17 that acts on printing substrate 02 in a directed fashion with magnetic field lines, and the printing fluid can comprise particles that can be aligned using magnetic field lines, for example magnetizable or magnetically active pigments.
In an advantageous embodiment, explicitly shown here (e.g.
Screen cylinder 18; 22 rolls along the lateral surface of impression cylinder and/or transport cylinder 21, and in the area of its aforementioned nip point 06; 07 with impression cylinder and/or transport cylinder 21, forms printing point 06, 07. In the region of its lateral surface, screen cylinder 18; 22 comprises a screen printing stencil 31; 32 as a printing forme 31; 32, arranged concentrically to the real or imaginary cylinder axis. In the mounted state, said stencil is releasably fastened at the end face, for example, to ring flanges, not shown in detail. Screen printing stencil 31; 32 can be embodied, in principle, as a continuous screen printing stencil in the shape of a cylindrical shell or sleeve, or as a finite screen printing stencil 31; 32 which, in the mounted state, is nevertheless circumferentially closed, forming a small butt joint.
Inside forme cylinder 18; 22, a squeegee 34 of a squeegee device 33 is provided, which in the thrown-on state is set against screen printing stencil 31; 32 from the inside, in a circumferential region of screen cylinder 18; 22 in which said stencil forms printing point 06; 07 with the impression and/or transport cylinder 21. This point can be provided, for example, a maximum of 5° in front of or behind the nip point 06; 07 with impression cylinder and/or transport cylinder 21—with respect to the operational direction of rotation. The squeegee 34 that is thrown on in this manner accumulates a bead of printing ink, which it rolls in front of it and forces through the permeable areas of screen printing stencil 31; 32 toward the outside.
In order to enable the quickest possible resumption of printing in the subsequent circumferential section UD, e.g. circumferential section UD, once an interruption 28, e.g. an opening 28, in impression cylinder and/or transport cylinder 21 has passed through nip point 06; 07, for the temporary and at least partial covering of opening 28 an aforementioned inking aid 29, e.g. a cover element 29 configured as a flap 29, can be provided, by means of which the opening 28 can be temporarily covered, at least in the leading area of opening 28. This allows the squeegee 34, which is lifted off during the passage of the open region of opening 28 through the nip point, for example, to be thrown on in advance. Cover element 29 can overlap slightly with the uninterrupted section of the cylindrical lateral surface, for example, and in that case shortens the length of the maximum circumferential section UD that is usable for printing. This geometric shortening is more than compensated for by throwing the squeegee on in advance, for example. By throwing the squeegee on in advance, a beginning of a printing area on the leading side—with respect to rolling during operation—can ideally be immediately adjacent to cover element 29, but optionally also with a slight stand-off distance. A lengthening of the circumferential section UN that is not usable for printing beyond the leading edge of the opening, which lengthening results from the slight overlap, for example, and optionally from a slight stand-off distance following cover element 29, and/or the distance between the earliest possible beginning of the printing area and the trailing edge of the opening can be between 10 mm and 50 mm, for example, preferably no more than 30 mm.
The maximum length LD that is usable for printing is limited by the earliest possible beginning of the printing area, determined by the press and/or safety considerations, and the latest possible end of the printing area on the trailing side, determined by the press and/or safety considerations. In principle, the latest possible end of the printing area can coincide with the leading end of the subsequent opening 28, e.g. the leading opening edge of the subsequent opening 28, or—e.g. for reasons of safety and/or the risk of contamination and/or based upon function—can be spaced by a distance aS to be maintained from the trailing edge of the following pit opening (see e.g. as schematically illustrated in
In a single-sized embodiment of impression cylinder and/or transport cylinder 21, the succeeding pit opening is understood as the same single pit opening.
In the embodiment of the printing press as a printing press for processing sheets, the at least one impression cylinder and/or transport cylinder 21 comprises at least one retaining device 24 on its circumferential surface, e.g. a gripper device 24 comprising one gripper or a group of multiple grippers, by means of which the leading end of a printing substrate sheet 02 can be picked up on the intake side and can be delivered to the conveyor line downstream on the output side. Gripper device 24 in this case is located, e.g. in a pit 26 provided in the otherwise cylindrical lateral surface 27 of cylinder 21, with the radially outwardly directed opening 28 of said pit, e.g. pit opening 28, interrupting and disrupting the cylindrical shell-shaped lateral surface 27.
In an embodiment of impression cylinder and/or transport cylinder 21 that is configured to receive, e.g. a number n (n∈) of printing substrate sheets 02, in this case, for example, n=3, one behind the other in the circumferential direction, said cylinder comprises multiple retaining devices 24 of this type, i.e. n devices, in this case, e.g. three, one behind the other in the circumferential direction, and a cylindrical shell-shaped circumferential section lying between each of these (see, e.g.
Regardless of the type and the number n of retaining devices 24 that are provided in the circumferential direction in the case of sheet printing, an interruption of the otherwise uninterrupted, cylindrically shaped lateral surface 27 is caused by the respective pit opening 28 on the circumferential surface of the impression cylinder and/or transport cylinder 21.
In an n-sized, i.e. a single-sized or multiple-sized embodiment, impression cylinder and/or transport cylinder 21, as viewed in the circumferential direction, comprises n, i.e. one or more circumferential sections UD, in particular cylindrical circumferential sections UD, that can be used as a counter bearing during printing, and n, i.e. one or more circumferential sections UN that have an interrupted lateral surface 27, which comprise retaining devices 24 and cannot be used as a counter bearing during printing. The circumferential sections UD that can be used as a counter bearing during printing are also colloquially referred to as “saddles”.
The circumferential section UN that comprises opening 28 and is not suitable and/or intended for printing has an effective length LN when rolled along the continued circumferential line which is equivalent to the length of the arc that extends over the opening. The circumferential section UN that is usable for printing therefore has a length LN that at the same time limits the maximum possible length L44 of the print image.
The circumferential section UN that cannot be used as a printing counter bearing can, in principle, be constituted solely by opening 28 of pit 26 that accommodates retaining device 24, or if applicable, by said opening 28 and—if provided—a functional section that adjoins said opening on the leading and/or the trailing side, for example an overlap area of an inking aid 29 (see below), optionally provided on the leading side, and/or a distance from the trailing edge of the pit opening that follows it, to be maintained by fixation. Conversely, the circumferential section UD that is usable for printing can be constituted, in principle, by the cylindrical outer surface section between a leading end of interruption 28, for example, the leading end of opening 28, and the trailing end of the same opening or the next opening 28 that follows in the circumferential direction. If the contour that delimits the disruption on lateral surface 27 on the leading and/or the trailing side is irregular in configuration, the length LN of the circumferential section UN that cannot be used during printing is understood, for example, as the arc length L02, as viewed in the circumferential direction, between the first point on the leading side and the last point on the trailing side of interruption 28 in the uninterrupted lateral surface 27, determined by the same retaining device 24.
Screen printing unit 19; 23 can be used for imprinting printing substrate 02, for example, which has been imprinted with a grid of copies in a plurality of rows and columns, with print image elements 56, or image elements 56 for short, or groups having a structure comparable to that of image elements 56, for each copy.
For screen printing, imaging cylinder 18; 22 carries, e.g. a plurality of imaging printing elements 25 or groups of imaging printing elements 25 on its periphery (e.g.
In a likewise advantageous embodiment (shown, e.g. in
The at least one dryer device comprises a dryer 14; 16; 36, preferably embodied as a radiation dryer 14; 16; 36. Said dryer comprises a drying means 38 for the purpose of drying, e.g. a radiation source 38, by means of which a drying medium can be applied to printing substrate 02 for the purpose of drying the same. In principle, drying means 38 or radiation source 38 can be embodied as integral and, when activated, can form an active zone A that extends continuously across an entire active width bA. The entire active width bA corresponds, for example, to at least a maximum printing width—in the transverse direction (e.g. indicated in the figures by a direction x).
As active drying means 38, the dryer device preferably comprises a plurality I of dryer elements 38k (k={1, 2, . . . I), I∈≧2), by means of which, as viewed in plane E02 of the printing substrate path at the site of cooperation, a plurality of active zones aj (j={1, 2, . . . n),n∈
≧2), e.g. drying zones aj (j={1, 2, . . . n), n∈
≧2), offset from one another transversely to the direction of transport of the printing substrate, i.e. in the transverse direction, more particularly spaced, over an active width bj in each case, e.g. drying or track width bj, can be acted upon by drying medium, for example radiation, and/or comprises a plurality of dryer elements 38k arranged offset from one another transversely to the direction of transport of the printing substrate.
Through the active or drying zones aj of dryer elements 38k, which are spaced from one another in the transverse direction, printing substrate 02 passing through the dryer 14; 16; 36 is acted on by the drying medium, preferably radiation, more particularly UV radiation, in a plurality of tracks ti (i={1, 2, . . . m), m∈≧2, in which preferably i=j and m=n) that are spaced from one another transversely to the direction of transport with respect to the printing substrate path, without interruption or preferably clocked one or more times in the manner described here for each cycle Z, as described in detail below.
Active width bj is understood as the width in the transverse direction across which the radiation profile extending through the maximum beam packet proceeding from the dryer element 38k in question has dropped to 50% of the maximum value on both sides with respect to area-based radiant output. For cases that do not involve a sharply defined boundary with an infinitely steep slope, this is understood here as the lateral boundary of the corresponding active zone aj.
Dryer elements 38k are preferably embodied as radiation sources 38k (k={1, 2, . . . I), I∈≧2) of electromagnetic radiation, e.g. light, in particular UV light, i.e. light for which at least the largest proportion of emitted radiant output lies in the UV spectral range, e.g. between 100 nm and 380 nm. In principle, dryer elements 38k could also be embodied differently, e.g. as individual blowing elements, comprising one or more nozzle openings, of a dryer 14, 16; 36 embodied as a convection dryer and/or hot-air dryer, by means of which the printing substrate can be acted on, for example, by fluid, e.g. air, as a drying medium. In a first embodiment, dryer elements 38k can each be formed, in principle, by individual drying medium sources 38k,i, e.g. by beam sources 38k,i, in particular radiation sources 38k,i themselves, or preferably by groups 38k of such beam or radiation sources 38k,i associated with one another, e.g. to be switched on and off collectively and/or simultaneously. In a first embodiment, these groups 38k can be already permanently formed and can be switched on and off only as an entire group, but can be displaceable, e.g. as group 38k, e.g. on a component configured as a type of dryer head, in the transverse direction—preferably by a motorized mechanism (see, e.g.
In an advantageous second embodiment, groups 38k can be variably formed and/or formable for different production runs from a plurality of individual beam or radiation sources 38k,i of drying means 38, in which case during operation, the individual beam or radiation sources 38k,i to be allocated to a group 38k preferably nevertheless always are and/or always can be activated and deactivated simultaneously, more particularly collectively, during the same production run (see, e.g.
The beam or radiation sources 38k,i that individually or in groups form dryer elements 38k are preferably embodied as UV light sources as described above, in particular as UV diodes, or UV LEDs for short.
In an advantageous refinement of drying means 38, the latter is embodied as a—structurally integral or multi-part—radiation source array, in particular an LED array, having a plurality of rows, extending one behind the other as viewed along the transport path, i.e. the printing substrate travel path, and extending across at least the maximum printing substrate width B02max, each row having a plurality of radiation sources 38k,i, in particular UV LEDs (see, e.g.
In a refinement that is less complex in terms of circuitry, a plurality of radiation sources 38k,i as viewed in the transverse direction, e.g. LEDs 38k,i, in particular UV LEDs 38k,i, or a plurality of longitudinal rows of radiation sources 38k,i, in particular longitudinal rows of LEDs 38k,i, can be operatively connected to the same switching element, via which they can be switched on and off only collectively as a fixed subgroup, and which are in turn to be combined to form the group 38k of radiation sources 38k,i to activated and deactivated collectively and/or simultaneously. The resolution of the irradiation is thereby decreased in the transverse direction; however, this is acceptable for some applications.
The smallest switchable unit, e.g. as viewed in the transverse direction, can be referred to here as a radiation segment—irrespective of whether this comprises merely a single radiation source 38k,i widthwise or a longitudinal row of radiation sources 38k,i, or even a plurality of individual radiation sources 38k,i or a plurality of longitudinal rows of radiation sources 38k,i.
In principle, the drying device that comprises dryer elements 38k and control device 37 can be configured as having an arrangement of dryer elements 38k that is fixed in the transverse direction and is displaceable laterally only for the purpose of aligning the dryer, and/or can be configured as having an integral or multi-part drying means 38, with which an active zone A extending continuously across an entire active width bA is or can be formed.
However, the drying device that comprises dryer elements 38k and control device 37 is preferably configured such that, in at least one operating situation, as viewed in the transverse direction, radiation that effectuates or at least supports drying can be applied by one or more of dryer elements 38k to a plurality of section widths, e.g. tracks ti, that are spaced from one another, the irradiated section widths or tracks ti being interrupted by sections or tracks that are not irradiated. In this case, each of the irradiated section widths or tracks ti can be formed by just one or by a plurality of mutually adjacent drying zones aj. The radiation profile that varies in this manner in the transverse direction with irradiated and non-irradiated sections or tracks ti can be achieved, for example, by positioning displaceable dryer elements 38k with appropriate spacing and/or preferably by activating dryer elements 38k in sections. In that case, dryer elements 38k can be in the form of radiation sources 38k or groups 38k of individual radiation sources 38k,i, as described above, which can be fixedly defined or can be variably defined, depending on the production run.
In the first embodiment comprising displaceable dryer elements 38k, a plurality or all of dryer elements 38k are preferably displaceable in such a way that positions of the active or activatable dryer elements 38k and/or spacings between the section widths that are irradiated by dryer elements 38k—preferably up to a spacing of zero or even a slight overlap—can be varied according to the characteristics of the printed product. For this purpose, dryer elements 38k can be movable and/or moved manually or in a motorized fashion in the transverse direction. In a more highly automated embodiment, dryer elements 38k can be or are positioned in the transverse direction automatically by means of control device 37.
This printed product-based configuration of the dryer device in the second embodiment, here a selecting and/or selection and/or positioning of dryer elements 38k by means of control device 37, can be carried out here on the basis of production-based data P, e.g. regarding the number and/or size and/or lateral position of copies on the printing substrate 02, that are input or selected manually—e.g. by press operators at a user interface 55—or based on production-based data that are obtained from a production plan or from an inspection. For this purpose, these data P that characterize the production run in terms of the positioning and/or formation of dryer elements 38k are supplied in the form of appropriately prepared information I(P) to control device 37, where it is processed, for example, in control means 48 configured for this purpose, e.g. computing and/or data processing means 48, to produce signals relating to the respective positioning. The data P and/or information I(P) can be obtained, in a manner explained in greater detail below, from data supplied by press operators at user interface 55, from data imported from the production plan, or from data that come from an inspection system or are supplied in parallel to the inspection system. The signals relating to positioning can then be sent, for example, to one or more drives provided for positioning. If not all of dryer elements 38k are required in each case, information (I(G(k)) about the dryer elements 38k to be activated, obtained from printed product-based characteristics, can be considered in actuating the beam or radiation sources 38k,i in that, for the production run in question, for example, only the selection G(k) of groups 38k or dryer elements 38k designated in this manner can be switched to an activatable status and/or activated.
In the second embodiment of drying means 38 with dryer elements 38k, which are provided in the form of groups 38k of beam or radiation sources 38k,i, formed or to be formed based on the printed product, the position and/or size of irradiated section widths and/or distances between section widths that are irradiated by dryer elements 38k can be varied due to the fact that, for example, from the totality of beam or radiation sources 38k,i arranged across the width b38, specific groups 38k of beam or radiation sources 38k,i that will be activated or are activated, between which groups of beam or radiation sources 38k,i that will not be activated or are inactive are arranged, are formed based upon the product-based characteristics. This also includes an embodiment in which smaller groups of beam or radiation sources 38k,i are combined in accordance with the printed product-based characteristics to form a plurality of overlapping groups 38k.
The printed product-based configuration of the dryer device in the second embodiment, in this case a designation of the sections to be exposed or to be acted on, i.e. the selection or definition of beam or radiation sources 38k,i that will be or are activated, for the formation of groups 38k to be activated, can also be carried out manually in this case—e.g. by press operators at a user interface 55—, e.g. by manual selection, or with computer assistance on the basis of data that are entered or selected manually. Examples of this are set out in detail below.
Additionally or alternatively, the designation can be made on the basis of production-based data P. The production-based data P or information I(P) can be obtained, in a manner described in greater detail below, from data supplied by press operators at user interface 55, from data imported from the production plan, or from data that come from an inspection system or are supplied in parallel to the inspection system. The data P from the production plan or the inspection system are supplied to the control device, e.g. via a data interface 59, and comprise data regarding product-based characteristics, e.g. the number and/or size and/or position of copies on printing substrate 02. In a more highly automated embodiment, such data are supplied—for example via a data interface—in the form of information I(P) concerning product-based characteristics to control device 37, where said data are used, for example, by appropriately configured control means 48, e.g. computing and/or data processing means 48, to form the groups 38k of beam or radiation sources 38k,i that can or will be activated for the production run in question. For instance, information I(G(x)) obtained from printed product-based characteristics can be considered in the actuation of the beam or radiation sources 38k,i via the groups 38k or dryer elements 38k that are formed and are to be activated from subgroups of the beam or radiation sources 38k,i in that only the selection G(x) of beam or radiation sources 38k,i that is designated in this manner can be activated for the production run in question, for example.
The selective activation of dryer elements 38k or of the beam or radiation sources 38k,i themselves that are combined into groups 38k is implemented, in accordance with the selection that is made, for example, in a dryer controller 49, which switches the dryer elements 38k or beam or radiation sources 38k,i and is optionally spatially included in the dryer 14; 16; 36. The product-relevant selection or the information I(G(k); I(G(x)) concerning this selection and/or formation of groups 38k can also form the basis for an overlapping in this regard, in the case of a switching that varies and/or is clocked in the direction of transport described below (e.g. indicated in the figures by a direction y), so that an activation and deactivation that is varied or clocked in terms of length and/or position is carried out in each case only for the dryer elements 38k that have been selected and, if applicable, positioned based on the product, and/or dryer elements that are combined to form groups 38k of beam or radiation sources 38k,i to be activated.
In the case of the first embodiment of drying means 38, for example, in a first operating situation (e.g.
In the case of the second embodiment, in a first operating situation (e.g.
A printing nip 52 is understood as printing strips that extend in the direction of transport and are limited on both sides by strips that extend in the direction of transport and are not imprinted in the printing assembly 03 or the printing unit 19; 23 in question, and that have a strip width that exceeds, e.g. the dimension of individual pixels or color points, e.g. a width of more than 5 mm, in particular more than 10 mm. However, printed strips that are interrupted by, e.g. such non-imprinted narrow strips of at least 5 mm are or can be combined, despite their discontinuity in the above sense, to form larger printing nips 52.
In an embodiment that is preferred here, the dryer elements 38k or groups 38k of beam or radiation sources 38k,i that are positioned and/or selected for activation are spaced from one another in the transverse direction, more particularly, at least three or more such dryer elements 38k or groups 38k are and/or can be arranged side by side, approximately or substantially equidistant from one another.
In an advantageous embodiment, the dryer device comprising dryer 14; 16; 36 and control device 37 is thus embodied and configured to switch on and switch off, simultaneously and/or collectively according to a specified sequence, only a portion of the radiation sources 38k,i in sections, in a plurality of predefinable groups 38k of radiation sources 38k,i, in particular at least four, which are spaced from one another transversely to the direction of transport, equidistantly, i.e. deviating by no more than 20% from the average distance. In a preferred refinement, it is embodied and configured to switch on and switch off, simultaneously and/or collectively, and once per cycle Z, to be specified in detail below, only a portion of the radiation sources 38k,i in sections, in a plurality of predefinable groups 38k of radiation sources 38k,i, in particular at least four, which are spaced equidistant from one another in this manner transversely to the direction of transport, according to a sequence that comprises a plurality of and/or at least three active phases PON of the same first phase length, spaced equidistant from one another.
Groups 38k are preferably spaced substantially equidistant from one another, i.e. deviating no more than 10% from the average distance. For example, the distances between groups 38k to be switched on and off differ from one another by a maximum of twice the smallest possible increment, as viewed transversely to the direction of transport, in the definition of groups 38k, i.e. the smallest possible increment in the transverse direction, e.g. the width of an aforementioned multi-track or preferably single-track LED row.
The configuration, i.e. the positioning and/or selection of dryer elements 38k or groups 38k to be activated, is particularly advantageously carried out based on the aforementioned product-based data P or information I(P). More particularly, this is carried out on the basis of specifications contained in the product-based information I(P), by means of which the number and position of at least three, preferably at least four print image elements 56, in particular the same print image element 56, that are or will be printed, spaced, in particular equidistant, from one another in the transverse direction, onto printing substrate 02, can be and/or is defined. Using these specifications, and factoring in the relative position between printing substrate 02 and dryer 14; 16; 36 at the site of action of the dryer 14; 16; 36, the positioning of dryer elements 38k and/or the formation of groups 38k are carried out or are undertaken accordingly.
In principle, the specifications regarding the number and distribution of the image elements 56 in the transverse direction can be obtained in any way, and can be available or made available in the information I(P). For instance, these specifications could, in principle, be obtained from image data concerning the entire width and length of the print image, e.g. from data that are available in the prepress stage, concerning the ink pattern relating to the entire print image, by the analysis of said pattern. However, this involves substantial effort; moreover, it is more likely to result in errors due to the large number of exposure areas to be designated individually.
In a particularly advantageous solution, however, these specifications to be used for positioning and/or selection are generated from specifications regarding the number nX, with nX∈≧3, in particular ≧4, preferably ≧6, and/or regarding the position and/or regarding the size of integral or multi-part image elements 56 that will be or have been applied, side by side in the transverse direction and, e.g. individually or in groups, and spaced, preferably equidistant, from one another, to printing substrate 02. Image elements 56 have, e.g. at least the same or substantially the same width, i.e. with a maximum deviation of ±2 mm, and/or even a similar ink pattern or motif. For instance, when numbers are printed as an image element 56, a number field having substantially the same dimensions, or when image elements 56 are applied by screen printing, the same motif can repeat nx times in the transverse direction. Dryer elements 38k or groups 38k then are and/or can be arranged according to this pattern of image elements 56 that are interrupted by non-printed areas. In that case, dryer elements 38k or groups 38k can be arranged in such a way, for example, and/or can be embodied as having such a width that each of the image elements 56 is fully included width-wise in the active width bA of the dryer elements 38k or groups 38k in question. In a variant of this or in another operating situation, in particular in conjunction with a conditioning device 17 that influences physical appearance and is assigned to or arranged upstream of dryer 16 in the printing substrate path, dryer elements 38k or groups 38k are or will be arranged and/or configured as having a width, for example, that is such that only a predefinable portion of the width of image elements 56 is included in and/or irradiated by the active width bA of the dryer elements 38k or groups 38k in question.
Said preferred embodiment is particularly advantageous in conjunction with an operating mode and/or embodiment of the printing press in which the print image applied by printing assembly 03 comprises a plurality, e.g. a number NX, with NX∈≧3, in particular ≧4, preferably ≧6, of copies 57 side by side across the print image width or printing area width B44, and/or a plurality, e.g. a number NY, with NY∈
≧3, in particular ≧5, of copies 57 one behind the other over the entire print image length or printing area length L44, which copies bear image elements 56 or image element groups that do not differ, at least in terms of their position in each of the copies 57 and/or even in the ink pattern. One or more of the aforementioned image elements 56 or image element groups may be provided per copy 57.
The sequence on which the control of radiation source 38 is based in this case preferably comprises a number, corresponding to the number nX of rows of imaging print image elements 56 or groups of such print image elements 56 lying one behind the other in one print image length in the circumferential direction, of active phases PON having the same first phase length, spaced equidistantly by respective inactive phases POFF, and one inactive phase POFF having a phase length that is significantly greater than the first phase length, i.e. at least twice as long. If a plurality of image elements, e.g. two, are provided per copy 57, spaced from one another in the direction of transport, a number of active phases PON having the same first phase length, said number corresponding precisely to the number of copies Ny, with each active phase covering a plurality of image elements 56, can be provided, with equidistant spacing. In a finer resolution, a plurality of such series, e.g. two, can be provided, offset from one another, each having a number Ny of phases PON with equidistant spacing.
The image elements 56 arranged side by side can each be included, as viewed in the direction of transport, in the aforementioned printing nips 52, wherein, in the direction of transport, for example, in each case a plurality of these image elements 56 or image element groups, e.g. a number nY, with nY∈≧2, can be arranged spaced from one another (see, e.g.
A “copy” 57 in this case refers to a part of the entire print image of a print section, which repeats in size and structure multiple times and preferably in a regular arrangement, and which—after at least a longitudinal and/or cross-cutting of printing substrate 02—represents a product unit, e.g. that can be used individually by intermediate or end consumers. In security printing, which is preferred in this case, for example, the individual copies 57 are formed on the printing substrate 02, which is imprinted with a print image in a printing area 44, for example, with partial print images that correspond to individual banknotes or security documents, which are first separated into the individual banknotes by cutting in the further processing path—optionally after further processing, e.g. a second printing and/or embossing and/or coating.
Independently, in principle, of the aforementioned embodiment of the dryer 14; 16, 36 having selectable and/or positionable and/or formable dryer elements 38k or groups, but preferably in conjunction therewith, drying means 38, in particular the dryer controller 49 that switches the beam or radiation sources 38k,i on and off, is connected in terms of signal transmission to a control means 51 that is part of control device 37, for example, which activates and deactivates the integral or multi-part drying means 38, which is present as a whole or preferably as selected and/or formed groups 38k, correlated in the manner indicated above, in particular synchronized with or clocked with respect to the press phase position and/or printing substrate phase position, i.e., for example, the position and/or movement of a press phase, in particular a phase position relating to the printing point 06; 07, and/or a position and/or an advancement of the printing substrate 02 in the printing press, or by means of which said drying means can be and/or is activated and deactivated as a complete unit or in parts. In particular, a correlation, more particularly a correlation of switching states SZ; SZON; SZOFF of the dryer elements 38k or groups that are involved, is carried out with respect to the length and/or position of a repeating sequence of activation and deactivation, i.e. of a switching-on and switching-off sequence that extends over a cycle length LZ and has at least one phase PON relating to the active state “ON”, e.g. switched-on state “ON”, and at least one phase POFF relating to an inactive state “OFF”, e.g. switched-off state “OFF”. The press phase can be formed from the directly or indirectly derived angular position of a cylinder 18; 21; 22 of a printing point 06; 07 or of another press element to be rotated true-to-register. The variable that relates to the advancement of printing substrate 02 can be by an angular position signal of a press element that transports printing substrate 02 in a manner true to register or by a passage signal from a sensor system provided along the transport path.
Cycle length LZ is preferably constituted by the repeat length between two successive printed sections, i.e. the shortest possible distance between the leading ends of two successive print lengths. Depending on the physical variable in question, said variable may relate spatially to a path length between two sites y or to an angle φ, or temporally to the interval of time between two points in time t. Factoring in the geometry and the transport speed profile, these variables can then be converted to one another and related, for example, to a position relative to the press phase. Cycle length LZ is equal to the sum of the length LD of a maximum section UD, e.g. circumferential section UD, that is usable for printing, as viewed along the transport path, and the length LN of a section UN that lies between two such sections UD and is not usable for printing. In the case of sheet-fed printing, the latter may be dependent, i.a. on the means for transporting sheets, and in the case of web-fed printing, it may be dependent, i.a. on interruptions caused by butt joints or even gaps between the ends of clamped printing formes. If an impression cylinder and/or transport cylinder 21 is provided, cycle length LZ is equal overall, for example, to the sum of the length LD of a circumferential section UD that is usable for printing and the length LN of a circumferential section UN that is not usable for printing and/or the nth fraction of the circumference of the n-sized or n-saddle-comprising impression cylinder and/or transport cylinder 21.
Cycle length LZ or the on/off sequence associated with it now comprises a switching-on/switching-off sequence having at least one phase PON in which drying means 38 or drying element 38k is activated, and at least one phase POFF in which drying means 38 or drying element 38k is deactivated. Here again, the term phases PON; PON can refer to a spatial variable or to an appropriately correlated temporal variable. Such a cycle-based sequence may comprise only a single activated phase PON and one deactivated phase POFF or, in a refinement, may also comprise a plurality of activated phases PON separated in each case by a deactivated phase POFF. The length of a deactivated phase POFF corresponds here, for example, to at least the width or the time required for passage of opening 28 plus the length or the time required for the passage of any functional sections that are present, which is determined, for example, by a distance aS upstream of the trailing pit edge and/or by the length of the aforementioned overlap of an optionally provided cover element 29.
The drying device thus comprises, in addition to dryer 14, 16; 36, a control device 37 having control means 51, by means of which the drying means 38, embodied, e.g. as drying elements 38k that are continuous across width b38 or as individual drying elements, can be or is switched on and off, as a whole or in part, in the aforementioned correlation with the press phase of the printing press and/or in correlation with the advancement of printing substrate 02. In particular, control device 37 comprising control means 51 can be used to move drying means 38 or at least one of drying elements 38k alternatingly to an activated or active or switched-on state “ON” for a period of time corresponding to the length of the activated phase PON, and to a deactivated or inactive or switched-off state “OFF” for a period of time corresponding to the length of the deactivated phase POFF. In so doing, switching means that are part, e.g. of dryer controller 49 and are used for switching drying means 38 and/or drying elements 38k are alternatingly brought to corresponding switching states SZON; SZOFF that effectuate the active or switched-on state “ON” and the inactive or switched-off state “ON”; “OFF” (see, e.g. as schematically illustrated in
Control device 37, which comprises data processing and/or control means 48; 51 and/or dryer controller 49, can be formed by a cohesive or distributed control circuit 37 or by cohesive or distributed data processing means 37 that are interconnected in terms of signal transmission, and comprises switching and/or data processing means for carrying out an aforementioned synchronization of a switching-on and switching-off sequence with the press phase and/or with the advancement of the printing substrate. Control device 37 can be fully or partially integrated into a press control system that is connected to other actuating means and/or drive means of the printing press, or can be fully or partially provided expressly for controlling dryer 14, 16; 36.
Said synchronization with the press phase and/or correlation to the advancement of the printing substrate of the sequence, which is based on a cycle length LZ, is accomplished, e.g. by transmitting signals SK that represent the press phase and/or the advancement of the printing substrate, e.g. a trigger signal SK, via a signal connection 35 from a clock generator 42 that represents the press phase of the printing press and/or the advancement of printing substrate 02 and serves the dryer controller, e.g. as master 42, to control device 37. Said clock generator can be constituted, for example, by a sensor system 42 that detects the relevant press phase of the printing press and/or the advancement of printing substrate 02, and/or by a master axis 42 of the drive controller that controls the indirect or direct driving of cylinder 21. In an embodiment that is particularly suitable for retrofitting purposes, this can be a sensor system 42 which is already provided in the press and is assigned to a component to be driven true-to-register, e.g. the infeed drum. For presses in which multiple components or component groups that relate to transport and/or printing are rotationally driven by mechanically independent drive motors 41 via a common electronic master axis, the master axis encoder 42 that serves as master 42 for the dryer controller can be formed by such an electronic master axis 42, which serves as master for a plurality of additional drive motors of the printing press. Said master axis 42 in the form of an actual electronic master axis 42 can follow the rotational movement of an actual angle signal, and said master axis in the form of a virtual master axis can be generated by data processing means and can be specified for all follow-on drives that are coupled thereto. In this embodiment, signal connection 35 is formed by the coupling to electronic master axis 42 and is embodied, for example, as a bus system or network system.
However, since the clocking of the dryer element or elements 38k of drying means 38 should preferably take place in real time, in an advantageous embodiment the signal connection 35 between clock generator 42, which is preferably embodied as a sensor system 42, and control device 37 is constituted by an analog line connection—as opposed to a bus system or a network—and/or the trigger signal Sk is transmitted in the form of a “rapid triggering”, e.g. via hardware signals, to control device 37 and/or to the process that will process the signals, and not via a clocked network system or bus system or a PLC that will process and/or relay the signals.
The sequence comprising one or more switching-on and switching-off processes is correlated—depending on the embodiment of the dryer controller and/or the relevant operation in one of the variants specified below—by means of a control logic, which is implemented in control means 51 and which is controlled, for example, by a mechanical switching arrangement, a purely electronic control circuit, a software routine, or a combination thereof. The recurring implementation of the sequence is correlated, in particular synchronized, with the signal SK, which represents the press phase and/or the advancement of the printing substrate. During a run through the sequence, within cycle length LZ, the position and duration of one or more active phases PON and one or more inactive phases POFF are considered, according to the circuit profile that is relevant for the operation. For this purpose, in a particularly advantageous embodiment, control means 51 comprises an electronic cam control mechanism, the virtual movement of which is synchronized with the press phase and/or the advancement of the printing substrate, and the profile of which forms the one or more active and inactive phases PON; POFF.
In principle, each switching-on and switching-off sequence, based on a cycle length LZ, for a plurality or all of the drying elements 38k or groups 38k to be activated can be correlated via dedicated control means 51 with a respective control logic each or with dedicated control logics implemented in collective control means 51, e.g. electronic cam control mechanisms. This can be advantageous preferably in conjunction with an operating mode and/or embodiment of the printing press in which the print image applied by printing assembly 03 comprises, for example, only one copy that extends across print image width B44 or a plurality of copies side by side that differ from one another within the ink pattern.
In the case of a drying means 38 that comprises a plurality of drying elements 38k or groups 38k as described above, the switching-on and switching-off sequence relating to the cycle length LZ is preferably correlated for a plurality or all of the provided and/or formed drying elements 38k or groups 38k synchronously with one another. In that case, the drying elements 38k or groups 38k to be activated for the production run in question can preferably be correlated collectively via common control means 51 using the same control logic and/or the same switching profile, or individually or in multiples via a plurality of synchronously operated control logics. Synchronous switching can be advantageous preferably in conjunction with an operating mode and/or embodiment of the printing press in which the print image applied by printing assembly 03 comprises a plurality, e.g. a number NX, of copies 57 side by side across the print image width B44, in which, e.g. NX∈≧2, in particular NX∈
≧3, more particularly ≧4, preferably ≧6, and/or a plurality, e.g. a number NY, of copies 57 one behind the other over the print image length L44, in which e.g. NY∈N≧2, in particular NY∈
≧3, preferably ≧5, each copy bearing image elements 56 that do not differ or barely differ from one another in terms of their position on the copy 57 and/or in terms of the ink pattern.
The dryer device—in particular the aforementioned control device 37 that switches drying means 38 and/or drying element 38k or groups 38k on and off in correlation with the press phase of the printing press and/or with the advancement of printing substrate 02—comprises control means 54, by means of which the length and/or position of at least one phase PON relating to the switched-on state “ON” for drying means 38 or one or more drying elements 38k or groups 38k within a repeating cycle for switching on and off can be and/or are varied on the basis of information I(P) relating to the production run, e.g. information I(F); I(L44); I(M) relating to or representing the print image or the printing substrate format F. More particularly, the information I(F); I(LB); I(M) relating to or representing the printing substrate format and/or the print image can be information I(F); I(L44); I(M) concerning the length L02, as viewed in the direction of transport, of the printing substrate sections, e.g. the printing substrate length L02, or concerning the print image length L44 relating to one printed section, or concerning the ink pattern to be printed by printing unit 19; 23. The information I(F) relating to the “printing substrate format” and/or the “printing substrate length L02” may relate directly to the actual format width and/or length, in which case, if necessary, a deduction Δf—fixedly definable, for example—(indicated by way of example for all embodiments in question in
Information I(M) relating to the print image or the ink pattern as information I(P) relating to the production run may involve geometric specifications for a grid of image elements. In that case, the length and/or position of the phase PON may be based, in the above-described manner, on the spatial or angular position thereof or the temporal correspondence thereof relative to the press phase position and/or the printing substrate position.
In a first variant, for the format-dependent or print image-dependent control of the phase length and/or phase position, for two or more discrete values or value ranges for the relevant information I(F); I(LD); I(M), a corresponding number of discrete phase lengths and/or phase positions for the one or more activated phases PON and/or a corresponding number of phase positions—e.g. at least partially spaced from one another—for the end of the activated phase PON may be provided or assigned in an assignment rule.
In an alternative, however, it can be provided that, on the basis of values that are derived from a continuous range of values for the relevant information I(F); I(LB); I(M), the control means 54 provides or supplies, via an assignment rule, a value for the phase length and/or phase position of the active phase PON or for the phase position of the end of the active phase PON from a continuous value range which is also restricted, e.g. in terms of maximum and minimum. “Continuous” is also understood as a sequence of equidistant, discrete increments, conditioned, for example, by restriction or by rounding to the smallest increments to be considered and/or managed in the variable in question.
Control device 37 processes signals SK relating to the aforementioned correlation and/or synchronization into signals ST, e.g. clocking signals ST, for controlling the switching on and switching off of drying means 38 or of a plurality of drying elements 38k or groups 38k, in particular those designated for switching-on and switching-off, taking into account a specific switching-on/switching-off profile, which is provided by control means 54 and is based on a cycle length LZ, and which has at least one phase PON relating to the active state “ON” and at least one phase POFF relating to the inactive state “OFF”. The profile supplied via control means 54 defines the phase length and/or phase position in each case for the at least one phase PON or phases PON relating to the active state “ON” in the cycle or within the cycle length LZ—preferably synchronized with the press phase position and/or the printing substrate phase position. The production-specific profile, i.e. of the at least one specific phase length and/or phase position, is obtained and supplied by control means 54 on the basis of information I(F); I(LB); I(M) that characterizes and/or relates to the printing substrate format and/or the print image (see, e.g.
Control means 54, included, e.g. in control device 37 for the correlated switching-on and off, the purpose of which is to supply the format-dependent and/or print image-dependent phase length and/or phase position, can be formed by one or more cohesive or dispersed circuitry and/or data processing means, which comprise circuitry and/or data processing means for determining a phase length and/or phase position relating to the switched-on position “ON”, based on the aforementioned received information I(F); I(LB); I(M) concerning the format and/or print image.
Control means 54, which is contained in control device 37, can be fully or partially integrated—according to control device 37 itself—into a press control system that is connected in terms of control engineering to other actuating and/or drive means of the printing press, e.g. a planning and/or control level 47, or can be provided peripherally and in close proximity to the dryer 14; 16; 36 to be controlled.
The length and/or position of the at least one active phase PON or the switching profile that extends over a cycle length LZ is determined and/or provided based on an assignment rule which is contained in control means 54, on the basis of the information I; I(F); I(LB); I(M) to be considered. The assignment rule can be provided, e.g. purely as an assignment rule in tabular form, or as a functional correlation in a computing and/or storage means that is contained in control means 54. This is also understood as a complex rule by which, on the basis of the information I(F); I(LB); I(M) to be factored in, a switching profile, which factors the specific length and/or position into a sequence that comprises one or more phases PON relating to the active state “ON”, is determined and/or created.
The information I(F); I(LB); I(M) to be considered on the input side of the assignment rule when determining the profile, i.e. the phase lengths and/or the phase ends or the phase positions, can be made available to control means 54 by the planning and/or control level 47 via a signal connection 53, for example. This can be carried out, for example—particularly in the case of information I(F); I(LB) that relates to or represents the printing substrate format F and/or the print image—from a control console assigned to the planning and/or control level 47. At said control console, the corresponding information I(F); I(LB) itself or specifications relating to this information I(F); I(LB) to be processed can be manually selected or input via a user interface 55. Manual designation is also understood to refer to a selection of areas in a correspondingly configured control screen or a selection via keys, as well as a combination of input and selection.
In a more highly automated variant, the information I(F); I(LB) or the specifications relating to said information I(F); I(LB) to be processed can be or are obtained from data relating to the product plan and/or the production plan, which are already available electronically at the planning and/or control level 47 or in a prepress stage, e.g. data concerning the number and/or size and/or position of the copies on a printing substrate sheet 02, and concerning the relative position of areas to be acted on, or in another embodiment, concerning the size and/or position of the printing substrate sheet 02.
In a first embodiment for the configuration of control means 54 or for dryer control, e.g. depicted schematically in
In the embodiment described above, in which printing substrate 02 is acted on by respective drying elements 38k or groups 38k in a plurality of tracks ti that are spaced from one another transversely to the direction of transport, the drying elements 38k or groups 38k involved are each preferably to be switched on and off once, simultaneously and/or collectively, per cycle (see
The specifications relating to the print format F or the length thereof for the case of the first embodiment, which is directed toward format-based clocking, will be or are supplied, in an advantageous solution, from the aforementioned data, which are available in electronic form from the product plan for the production run in question or from the inspection, or are supplied by means of manual input and/or a selection of such specifications, for example at the control console. The manually selected or input data regarding format F can be entered directly for the purpose in question, or can be entered previously for a different purpose and then imported.
In a second embodiment that can be implemented or provided in place of or as an alternative to the first embodiment, as the case may be, and which is indicated schematically, e.g. in
In the embodiment described above, in which printing substrate 02 is acted on by respective drying elements 38k or groups 38k in a plurality of tracks ti that are spaced from one another transversely to the direction of transport, the drying elements 38k or groups 38k involved are each preferably to be switched on and off once, simultaneously and/or collectively, per cycle (see
Although in the case of the second embodiment, which is directed toward print image length-based clocking, the specifications relating to the print image length L44 are or can be obtained, in principle, based on the aforementioned image data from the prepress stage, in a solution which is advantageous due to its decreased complexity, these specifications preferably will be or are supplied from data that are available in the product plan or by manual input and/or selection.
In a third embodiment that can be implemented or provided in place of or as an alternative to the first and/or second embodiment, as the case may be, and which is indicated schematically, e.g. in
For configuring the dryer device, the print image-based information I(L44); I(M) concerning the print image length L44 can be supplied to the second embodiment directed to the print image length-based clocking, or such information concerning the number and/or position of the printing strips 46 can be supplied to the third embodiment directed to the printing strip-based clocking, and/or the specifications on which said information I(L44); I(M) is based can be supplied, for example, from the aforementioned data that are available in electronic form for product planning for the production run in question or for the inspection, or by the manual input and/or selection of such specifications, for example at the control console. The manually selected or input data regarding format F can be entered directly for the purpose in question, or can be entered previously for a different purpose and then imported.
In principle, specifications on which this information I(L44); I(M) is based could also be based on data and/or specifications that will be or are obtained by analyzing the print image to be printed in printing point 06; 07, more particularly by analyzing the ink pattern, which is present, e.g. in the form of data in the prepress stage, i.e. directly from data that are used for producing printing forme 31; 32, or from data obtained therefrom by means of analysis. For this purpose
In the case of the third embodiment, irrespective of the way in which the underlying data are supplied, a plurality of fine strips to be printed, which are interrupted, e.g. by narrower strips that are not to be printed, can be or are combined to form larger printing strips 46, despite this discontinuity.
In the case of the third embodiment, which is directed toward printing strip-based clocking, the switching profile is preferably provided, i.e. the cycle-based n phase lengths and/or phase positions are preferably designated, based upon specifications, or based upon information I(M) that contains these specifications and describes a pattern, extending over the print image length L44 in the direction of transport, of a plurality of print image elements 56 that are or will be printed according to the plan, spaced from one another, onto printing substrate 02. These are specifications, for example, that can be and/or are used for defining the number and position of three or more print image elements 56, in particular the same print image element 56, which are or will be printed, spaced, in particular equidistant, from one another in the direction of transport, onto printing substrate 02. Using these data, and factoring in the aforementioned synchronization of the respective cycle with the press phase and/or the printing substrate phase, during production operation, drying means 38 or drying element 38k or the formed groups 38k, which is/are positioned and/or selected in the above-described manner, expose the printing substrate 02 that is transported past it to the drying medium, in particular the radiation, in a clocked manner, in accordance with the profile.
Although in principle, these specifications relating to the number and distribution of the image elements 56 in the direction of transport are all, or all can be obtained on the basis of the aforementioned data from the prepress stage, they are preferably generated from specifications regarding the position and size of an image element or a subset of a plurality of image elements 56, e.g. a number nY, with nY∈≧3, and from specifications regarding the number nX thereof, which are to be or have been applied one behind the other and spaced from one another—preferably equidistant—in the direction of transport, onto the printing substrate 02 according to plan. The specifications regarding the position and/or size of the image element or the subset of image elements 56 can be and/or are supplied directly from data from the product plan or inspection, or by means of manual input. From this position and/or extension of the at least one of a plurality of image elements 56 and from specifications that can be used to deduce the position of the remaining image elements 56, the cycle-based profile of the switching on and off of drying means 38, or of the positioned and/or selected dryer elements 38k and/or formed groups 38k, multiple times is provided via an appropriately established routine.
Image elements 56 have, e.g. at least the same or substantially the same length, i.e. ±2 mm, in the direction of transport and/or even, e.g. a similar ink pattern or motif. Dryer elements 38k or groups 38k then are or can be activated during a cycle in a plurality of active phases PON that are interrupted by inactive phases POFF, according to this pattern of image elements 56 in the direction of transport.
In a particularly advantageous embodiment, the dryer device comprising dryer 14; 16; 36 and control device 37 is embodied and configured to switch all of radiation sources 38k,i, or preferably only some of radiation sources 38k,i, on and off in sections, simultaneously and/or collectively, per repeating cycle Z, according to a sequence that comprises a plurality of and/or at least three active phases PON of the same first phase length, spaced equidistant from one another. In a preferred refinement, the subgroup of radiation sources 38k,i is to be switched on and off simultaneously and/or collectively in at least four predefinable groups 38k of radiation sources 38k,i, which are spaced from one another transversely to the direction of transport, approximately equidistant, i.e. deviating no more than 20% from the average distance.
In an advantageous solution for configuring a clocking that will be described below, configuration is accomplished using specifications regarding the number ny, with ny∈≦3, in particular ≧5, and/or regarding the position and/or the size of integral or multi-part image elements 56 that will be or have been applied to printing substrate 02, one behind the other and spaced from one another—preferably equidistant, individually or in groups—in the direction of transport.
In a particularly advantageous embodiment, the dryer device comprising dryer 14; 16; 36 and control device 37 is embodied and configured to switch all of radiation sources 38k,i, or preferably only some of radiation sources 38k,i, on and off in sections, simultaneously and/or collectively, in each repeating cycle Z, according to a sequence that comprises a plurality of and/or at least three active phases PON of the same first phase length, spaced equidistant from one another. In a preferred refinement, the subgroup of radiation sources 38k,i is to be switched on and off simultaneously and/or collectively in at least four predefinable groups 38k of radiation sources 38k,i, which are spaced from one another transversely to the direction of transport, approximately equidistant, i.e. deviating no more than 20% from the average distance.
Said preferred embodiment is particularly advantageous in conjunction with an operating mode and/or embodiment of the printing press in which the print image applied by printing assembly 03 has a plurality of copies 57, e.g. a number NY, with NY∈≧3, in the direction of transport, one behind the other in the same alignment over at least print image length L44, which copies bear image elements 56 that do not differ from one another, at least in terms of their position in the respective copy 57 and/or in terms of their dimensions and/or even in terms of the ink pattern.
The nY image elements 56 arranged one behind the other in the direction of transport are contained, e.g. in the aforementioned printing nips 52, wherein in the transverse direction, for example, in each case the number nx of these image elements 56 can be arranged spaced from one another (see, e.g.
In the above, the terms “phase length” and “phase position” or the respective shortened forms “length” and “position”, unless otherwise clearly specified, can be or are used to refer to the size and the position, respectively, of the phase in question in a spatial sense—e.g. as a position or angle—and to the temporal correspondence thereof as a duration and as a temporal relative position within the synchronized cycle length LZ. These spatial and temporal dimensions are directly correlated with one another over the speed profile. Location, time, and angle are indicated as such for the abscissae in
As has already been stated, the above-described dryer device is located in the printing substrate path downstream of at least a first printing point 06; 07 such that in the activated or active state “ON”, it is arranged with drying means 38 or with dryer elements 38k, which are positioned and/or selected or formed by groupings, directed toward the printing substrate path. In a first particularly advantageous embodiment, dryer 36 is provided as an intermediate dryer 36 between two printing points 06; 07 arranged one behind the other in the printing substrate path.
In another particularly advantageous embodiment of the printing press, dryer 14 is provided in the printing substrate path in the region of or downstream of an aforementioned conditioning device 17 that influences the physical appearance of the printing ink—e.g. by aligning particles that are contained in the printing ink. Said dryer can be directed, for example, toward a transport path in the region of a means 58 that effectuates said influence, for example toward the surface of a rotary body 58, e.g. magnetizing cylinder 58, which comprises magnetized or magnetic material and, for example, transports the printing substrate 02.
In more general terms, the preceding teaching explained in the context of an example of a security printing press embodied as a rotary screen printing press can also be applied, in principle, unless obviously contradicted, to a printing unit that operates according to flat screen printing or letterset printing, and/or to a method that operates according to flat screen printing or letterset printing. For said purposes, the term printing substrate 02 can also be understood to include other types of substrates, for example molded articles and/or hollow bodies, in addition to planar articles. The drying means 38 or all selected and/or formed dryer elements 38k can also be switched on and off in this case on the basis of information I(F); I(L44); I(M) relating to the printing substrate format and/or the print image, with phase lengths and/or phase positions that vary based on the format and/or the print image, in order to avoid the undesirable passage of ink, for example through non-printing sections of a printing forme.
However, the arrangement and/or the operation of the above-described dryer device having dryer 14, 16; 36 and the associated control device 37 is not limited to printing presses, in particular security printing presses, which have a printing assembly 03; 03′ that operates according to the screen printing method or the aforementioned letterset method, and can instead optionally be extended to printing presses, in particular security printing presses, that operate according to a printing method other than the screen printing method. Preferably, however, these are printing presses, the printing assembly 03 of which applies or can apply the ink pattern of a plurality of individual image elements 56 over a printing length, at least as viewed in the direction of transport of printing substrate 02, e.g. spaced regularly, i.e. spaced by areas that are not to be printed in the printing unit 19, 19′; 23; 23′ or printing assembly 03 in question. A printing forme 31; 32 of a printing assembly 03; 03′ embodied and/or operated in this way carries over its length—as viewed in the direction of transport and/or in the circumferential direction—e.g. with regular spacing, the subjects of individual image elements 56 to be printed in the printing unit 19; 19′; 23; 23′ or printing assembly 03 in question, which are spaced by non-printing areas.
In an alternative embodiment of a printing press which is particularly advantageous for the use of an aforementioned dryer device, more particularly a security printing press (e.g.
In this embodiment, the security printing press thus comprises at least a first printing point 06″ in the printing substrate path, at which printing substrate 02 passing through this printing point 06″ can be imprinted in sections, i.e. onto web sections or, more particularly, onto successive printing substrate sheets 02, on at least a first of its two sides, in a cycle Z having a cycle length LZ that is fixed based on the printing substrate feed rate at printing point 06″, with print images having a certain print image width B44 and a print image length L44 that is shorter in relation to the cycle length LZ, and a second printing point 07″ that is the next closest downstream, at which the printing substrate 02 passing through this printing point 07″ can likewise be imprinted with print images on at least the second of its sides. The sections are constituted as sections of a web-type printing substrate 02, or in this case preferably as printing substrate sheets 02.
In principle, the first side, and downstream the second side, can be imprinted in succession by means of printing units 19″; 23″ of any printing method and/or configuration. Preferably, however, printing substrate 02 can be imprinted at the first printing point 06″ according to an offset printing method and/or according to a heliographic printing method. At the second printing point 07″, it can then advantageously be imprinted at least on its second side, but preferably on both sides, by means of a printing unit 23″, according to an indirect printing method and/or in multiple colors simultaneously. At the second printing point 07″, it can be imprinted, preferably on both sides, according to an offset printing method and/or according to a heliographic printing method.
The dryer device comprises a dryer 14; 16; 36 having an above-described integral or multi-part drying means 38, and is located in the printing substrate path between the first and the second printing point 06″; 07″ and/or in the printing substrate path downstream of the second printing point 07′. Said drying means is able to expose the printing substrate 02 to radiation for the purpose of drying the same as it passes along its transport path through dryer 14; 16; 36. Drying means 38 of dryer 14; 16; 36 is preferably formed in the manner described above by an arrangement, extending at least across the maximum printing substrate width B02max, of a plurality of radiation sources 38k,i, in particular UV LEDs, arranged side by side, i.e. a number of at least 50 across the maximum printing substrate width B02max and/or a length-based number of at least 50, preferably at least 70 radiation sources 38k,i per meter.
In a preferred embodiment, control device 37, which controls drying means 38 of dryer 14; 16; 36 with respect to activation and deactivation, is connected in terms of signal transmission to an encoder 42, which transmits signals SK that represent the press phase and/or the advancement of the printing substrate, and effectuates, for each cycle Z, a switching on and off of drying means 38 or of at least a portion thereof, according to a sequence comprising at least one active phase PON and at least one inactive phase POFF, in correlation with the press phase position and/or printing substrate phase position. For each cycle Z, one switching on and off is carried out, more particularly, precisely one switching on and off, of radiation source 38 or at least a portion thereof, with at least one, preferably precisely one active phase PON and one inactive phase POFF per cycle Z (see, e.g.
Printing substrate 02 is preferably acted on in a track, more particularly in a single track, as viewed transversely to the direction of transport, with the width of said track being selected based on printing substrate width B02 and/or corresponding substantially to said width, i.e. for example with a maximum deviation of at most +1/−10 mm, in particular +0/−5 mm per lateral edge. (See, e.g.
For all the described embodiments and variants of the printing presses, in particular security printing presses, and/or dryer devices, the radiation output Φ to be emitted by the radiation sources 38k,i or groups 38k in the activated state, which are switched on according to the sequence, can be varied based upon a variable that represents the press feed rate or printing substrate feed rate V, or speed V for short. For this purpose, a corresponding correlation Φ(V) between a measurement of the press feed rate or printing substrate feed rate V and a measurement of the radiation output is made available, e.g. in tabular form or in the form of a function defined continuously or by section, and an algorithm for converting this dependency defined by the correlation Φ(V) is provided. The output preferably increases stepwise or continuously with the press feed rate or printing substrate feed rate V. In principle, the correlation between output and press feed rate or printing substrate feed rate V can be permanently stored in the control system. Information I(V) relating to the current speed V can be supplied to control device 38 from, e.g. the press controller or from an encoder that supplies a measurement of speed V.
However, the profile of the correlation can preferably be varied via a user interface 55 (see, e.g.
“Control elements” are understood here and in the following—unless otherwise explicitly specified—as any type of elements that are suitable for operation by press operators, e.g. buttons, keys, switches, input fields, control means for screen cursors or mouse pointers, and optionally other elements that are suitable for interaction with the system to be controlled and/or configured.
In an embodiment that is preferred here, user interface 55 is embodied as a touch-sensitive screen 55, for example what is known as a touch screen 55, or what is known as a touch panel 55, with the required actuation, or at least comprises such a touch-sensitive screen 55. The or at least some of the stated control elements 61; 62; 63 that relate to the parameterization of the aforementioned correlation are embodied, e.g. as touch-sensitive fields 61; 62; 63 of a control panel 66 configured for this purpose, e.g. an input mask 66 or screen mask 66, with programming related to the positioning function, thus in this case for influencing the profile of the correlation between a measurement of radiation output and a measurement of press feed rate or printing substrate feed rate V. In the present case, the correlation is constituted by an assignment of values for the measurement relating to the radiation output to grid points, spaced from one another, for the measurement relating to the press feed rate or the printing substrate feed rate V. The grid point to be changed can be activated, for example, via a field 63 that is assigned to said grid point, and the value thereof can be adjusted by means of fields 61; 63 that represent plus and minus buttons. In principle, however, a touch-sensitive block of numbers could be provided as an alternative for adjusting the values. The current profile of the correlation can be visualized, for example, via a display field 64 likewise represented in the screen mask 66.
The correlation to be factored in by control device 37 is made available to it, for example, via an existing or additional signal connection, and is implemented by said control device in the control of dryer 14, 16; 36, based upon the data relating to the press feed rate or printing substrate feed rate V, which are likewise available.
As has been stated at various points above, the configuration of the dryer device with respect to the positioning and/or selection of dryer elements 38k or groups 38k of radiation sources 38k,i to be activated and/or with respect to the phase profile on which the cycle Z or the sequence is based can be carried out in a first advantageous embodiment on the basis of data provided manually via a user interface, and in an alternative advantageous embodiment using data that already exist in the product plan or the printing press and that characterize the printed product or intermediate printed product to be produced.
In the first embodiment of a device for configuring the dryer device for a specific production run, a user interface 55 that is connected in terms of signal transmission to control device 37 is provided, which can be used by press operators to perform a configuration in the transverse direction. In particular, on this user interface 55, the number and/or lateral position and/or width of dryer elements 38k or groups 38k, which are spaced from one another transversely to the direction of transport and are to be activated, and/or the number and/or lateral position and/or width of provided tracks ti to be acted on by dryer elements 38k or groups 38k, and/or the number and/or lateral position and/or width of copies to be printed side by side onto printing substrate 02 in the production run in question can be defined and/or modified. For this purpose, user interface 55 comprises control elements 71; 72; 73; 74; 76; 77; 78, which are connected in terms of signal transmission to control device 37, in particular functionally connected, and by the actuation of which, specifications regarding parameters such as, in particular, the number and/or lateral position and/or width of the required groups 38k and/or the required tracks ti and/or the copies 57 provided side by side on printing substrate 02 can be manually defined and/or modified. These specifications are also understood to include specifications that are or will be processed further into the corresponding specific parameters.
In that case, keys 67 of a control field embodied as an alphanumeric keypad can be provided as control elements 67, via which specifications regarding the number and/or lateral position and/or width of groups 38k and/or regarding the tracks ti and/or the copies 57 provided side by side on printing substrate 02 can be input and, e.g. should be confirmed. Alternatively or additionally, control elements 68; 69 that function as plus and minus buttons and/or as left or right buttons can be provided, the actuation of which allows a value and/or a position of a permanently assigned parameter or a parameter that can be selected in advance, for example the number and/or position of a group 38k and/or of a track ti and/or of a number of copies, and/or the width of a group 38k and/or of a track ti and/or of a copy 57 and/or of printing substrate 02 to be modified. Finally, alternatively or in addition to one or more of the aforementioned variants, control elements—not explicitly illustrated here—can be provided, which are embodied as selection means, and which, when actuated, enable specifications regarding the number and/or lateral position and/or width of groups 38k and/or of tracks ti to be selected from predefined and, e.g. listed values.
For the aforementioned variants for configuration in the transverse direction, control elements 71; 72; 73; 74; 76; 77; 78 that are used for selecting and/or adjusting a parameter that is to be modified or adjusted are provided, the actuation of which allows the parameters that are to be adjusted, for example, via the aforementioned control elements 67; 68; 69, to be selected. Such control elements 71; 72; 73; 74; 76; 77; 78 can be used, for example, for selecting and/or, for example, setting parameters that relate to the number of groups 38k or tracks ti or copies 57 provided side by side, and/or to the lateral position of a group 38k or a track ti or a copy 57 and/or of the printing substrate 02, and/or to the width of a group 38k or a track ti or a copy 57, and/or to the lateral position of a group 38k or a track ti in relation to a copy 57 and/or the width of the printing substrate 02. In the case of the lateral position of a group 38k to be activated or of a track ti, although in principle the specification can be based on the position of printing substrate 02, it is preferably carried out via corresponding control elements 77; 78 relative to the position of a copy 57 or of a column that comprises a plurality of copies 57 one behind the other.
In a preferred refinement of the first embodiment of the device for configuring the dryer device for a specific production run, press operators can configure the dryer device, in particular the operating behavior thereof, in the longitudinal direction, i.e. with respect to the direction of transport of the printing substrate, via the stated or via an additional user interface 55 that is connected in terms of signal transmission to control device 37. In particular, the sequence of action can be configured, or the number and/or phase length and/or phase position of active phases PON in cycle Z and/or of the copies 57 provided one behind the other on printing substrate 02 can be defined and/or modified via said user interface 55. For this purpose, the user interface comprises control elements 81; 82; 83, which are connected in terms of signal transmission to control device 37, and the actuation of which enables specifications regarding parameters such as, in particular, the number and/or position and/or length of the active phase PON or phases PON in a cycle Z, and/or the number and/or position and/or length of the copies 57 provided one behind the other on printing substrate 02 to be defined and/or modified manually. These specifications are also understood as specifications that will be or are further processed to obtain the corresponding specific parameters.
In that case, additional control elements 67, embodied as keys, of the control pad or of an additional control field configured as an alphanumeric keypad can be provided, which can be used for inputting specifications regarding the number and/or position and/or length of the active phases PON and/or the number and/or position and/or length of the copies 57 provided one behind the other on printing substrate 02. Alternatively or additionally, the aforementioned or additional control elements 68; 69 that act as plus and minus buttons and/or as left or right buttons can be provided, the actuation of which enables a value and/or a position of a fixedly assigned parameter or a parameter that can be selected in advance, i.e. the number and/or position and/or length of the active phases PON and/or of the copies 57 provided one behind the other on printing substrate 02, to be modified. Finally, alternatively or in addition to one or more of the aforementioned variants, control elements—not explicitly shown here—can be provided, which are embodied as selection means and the actuation of which enables specifications regarding the number and/or lateral position and/or width of the active phases PON and/or of the copies 57 provided one behind the other on printing substrate 02 to be selected from predefined and, e.g. listed values.
For the aforementioned variants for configuration in the longitudinal direction, control elements 81; 82; 83 that are used for selection and/or adjustment can be provided, the actuation of which enables the parameter currently to be adjusted via the aforementioned control elements to be selected. Using such control elements 81; 82; 83, the number of active phases PON provided, or the number of copies 57 provided one behind the other on the printing substrate section or sheet 02, and/or the position and/or length of at least one active phase PON or of at least one copy 57 on printing substrate 02, in particular printing substrate sheet 02, can be selected and/or set, for example. For the number and position of a plurality of active phases PON provided one behind the other on the printing substrate section or printing substrate sheet 02, the specification can refer, in principle, to the position of printing substrate 02. Preferably, however, the position of the active phases PON is specified—e.g. via control elements not shown here—in relation to the position of a copy 57 or a row of copies 57 comprising a plurality of copies 57 side by side.
In principle, the control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 of the common or of each user interface 55, which relate to the configuration, in particular the parameterization, of the dryer device in the transverse direction and/or the printing substrate transport direction, can be embodied as keys of a keypad 55, which is provided, e.g. on the control console. In an embodiment that is preferred here, however, user interface 55 is embodied as a touch-sensitive screen 55, for example as what is known as a touch screen 55, or what is known as a touch panel 55, with the required actuation. The stated control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83, or at least a subgroup thereof, that relate to the parameterization of the dryer device in the transverse direction are embodied, e.g. as touch sensitive fields 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 with programming relating to the respective positioning function, thus in this case, e.g. for defining and/or modifying specifications relating to the number and/or lateral position and/or width of groups 38k and/or of the required tracks ti and/or of the copies 57 provided side by side on printing substrate 02, or specifications relating to the number and/or position and/or length of the active phases PON and/or of the copies 57 provided one behind the other on printing substrate 02. A combined embodiment of control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 may also be provided, with control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 configured both in terms of hardware and software.
In principle, the control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 embodied as touch-sensitive fields can be provided as fields of the same control panel 84; 85, e.g. an input mask 84; 85 or screen mask 84; 85, or can be distributed among a plurality of control panels 84; 85; 86, e.g. input mask, 84; 85; 86 or screen masks 84; 85; 86, e.g. grouped thematically with respect to their association with related positioning functions.
For example, one or more control elements 72; 73; 81 that relate to specifications that are required for configuring the dryer device, for example specifications regarding printing substrate dimensions and/or regarding the printing substrate position, and that also are and/or will be factored, e.g. into adjustment or control functions or processes other than the configuration of the dryer device, can be provided in one or more other input or screen masks 86 (see, e.g.
Control elements 71; 72; 73; 74; 76; 77; 78; 81; 82; 83 for the configuration or parameterization of the dryer device in the transverse direction and/or the longitudinal direction are operatively indirectly or directly connected in terms of signal transmission—irrespective of the hardware or software embodiment of said elements—to the control device 37, in particular to the aforementioned control means 48 thereof, which switches the dryer on and off at least once per cycle Z in spaced groups 38k, and/or the group or groups 38k. In this case, either the specifications regarding the relevant parameters—e.g. specifications regarding the number and/or lateral position and/or width of groups 38k and/or of tracks ti and/or of copies 57 provided side by side, and/or the specifications regarding the number and/or position and/or length of the active phases PON and/or of the copies 57 provided one behind the other on printing substrate 02—are supplied directly as production-based data P as described above via the signal connection to control device 37 and/or control means 48 and are processed there, or information I(P) relating to the configuration in the transverse and/or longitudinal direction, which has been obtained in advance by computer-assisted processing of the production-based data P generated here from the specifications regarding the parameters, are supplied to control device 37—as illustrated e.g. schematically.
In a first example of the configuration of the dryer device using a user interface 55 (see, e.g.
In a simple variant, the dryer device can be configured in the direction of transport over printing substrate length L02 or over a variable correlated therewith as a parameter. In this way, the length of the active phase PON, which is contained in the sequence and corresponds to printing substrate length L02 and which is based on a cycle Z, is defined. In that case, a control element 81 that represents, e.g. the parameter of printing substrate length L02 can be selected, and the size thereof can be adjusted or varied, e.g. via control elements 69 that function as plus or minus buttons, and/or via control elements 67 that are configured as keys of an alphanumeric keypad.
The control elements relating to the specifications regarding printing substrate length L02 can be included in the same or in a different input or screen mask 84; 86. Press operators can switch back and forth between different input or screen masks 84; 86 via, e.g. control elements 87 that function as buttons.
In this case, the the dryer device is configured, for example, by positioning dryer elements 38k or groups 38k, as viewed transversely to the direction of transport, via manually operated control elements 67; 68; 69; 71. Where appropriate, the dryer elements 38k or groups 38k to be activated for a production run can be designated using a larger number of control elements 67; 68; 69; 71. This can be carried out positively by selecting the dryer element to be activated, or negatively by selecting the inactive dryer element 38k. A dryer element 38k or a group 38k is thereby positioned, e.g. by selecting the dryer element 38k to be adjusted and the subsequent positioning either by inputting a specific position using keys of an alphanumeric keypad, or using buttons 68 that adjust the position toward one side or the other.
In a second example of the configuration of the dryer device using a user interface 55 (see, e.g.
Particularly in the case of greater resolution and/or reduced adjustment effort, however, a variant is advantageous in which the lateral position and width of a group 38k or track ti, or where applicable even a plurality of groups 38k or tracks ti, is defined on the basis of only one copy 57, and based on this definition, which is based on one copy, and the position and width of all the required groups 38k or tracks ti is determined using information relating to the number and position of copies 57 arranged side by side on printing substrate 02. In that case, the information relating to the number and position of copies 57 arranged side by side on printing substrate 02 can be available or provided in a variety of ways. For example, specifications regarding the number Nx and the width B57 of copies 57 to be arranged side by side laterally on printing substrate 02, or the width B02 of the printing substrate 02 that receives the Nx copies 57 side by side can be used for this purpose. For the specifications, e.g. appropriately configured control elements 74; 76; 72 can be provided. If the printing substrate 02 to be acted on and/or the overall print image is not symmetrical with respect to the transverse extension of dryer 38 and/or with respect to press center M, a specification regarding the corresponding lateral offset ΔM can be provided via, e.g. an additional control element 73.
The definition of the width and position of a group 38k or track ti that is to be activated based on one copy 57 can be implemented by the specific activation of individual radiation sources 38k,i or radiation segments. In the case of a touch-sensitive screen 55, this can be a direct selection of radiation sources 38k,i or radiation segments, represented true-to-scale in the transverse direction in an image of a copy 57. In the case of a touch-sensitive screen 55, selection can be made by touch. Alternatively, however, it is also possible for the definition of the group 38k or track ti based on copy 57 to be carried out by defining the two ends, i.e. the radiation sources 38k,i or radiation segments that delimit the group 38k or track ti at both ends. In a first variant, this can again be carried out by touching the relevant boundary radiation sources 38k, or radiation segments. In another variant, radiation sources 38k,i or radiation segments—e.g. as boundary radiation sources e1; e2 or boundary radiation segments—can be via appropriately configured control elements 77; 78; 67; 68, for example, by selecting the control element 77; 78 that relates to the parameter to be defined, e.g. the control element 77; 78 that relates to the right edge or the left edge of the group 38k or track ti to be formed, and the definition thereof can be by either inputting a specific position, e.g. using keys of an alphanumeric keypad, or using buttons 68 that adjust the position toward one side or the other.
In the second example of the configuration of the dryer device, in a simple variant, the dryer device can be configured in the direction of transport over only the printing substrate length L02 or over a variable that is correlated therewith. For this purpose, a control element 81 that represents, e.g. the parameter of printing substrate length L02 can be selected, and the size thereof can be adjusted or varied, e.g. via control elements 69 that function as plus or minus buttons, and/or via control elements 67 that are configured as keys of an alphanumeric keypad. As described above, the control elements relating to the specifications regarding printing substrate length L02 can be included in the same or in a different input or screen mask 85; 86.
In a refinement, it is possible for the configuration of the dryer device in the direction of transport to permit the definition of a plurality of active phases PON per cycle Z, in particular for each printing substrate length L02. For example, the dryer device can be configured in the longitudinal direction such that at least one active phase PON is provided for each of the copies 57 arranged one behind the other along a printing substrate length L02.
In a first variant, this configuration in the longitudinal direction can be carried out directly, in principle, using appropriately configured control elements 67; 68; 69; 71 for all of the active phases PON of cycle Z, wherein for each of the phases PON, the position thereof in the direction of transport and the width thereof would need to be specifically definable using corresponding control elements. In the case of a user interface 55 embodied as touch-sensitive, the formation of phases PON could alternatively be defined by selecting or defining individual longitudinal sections from a total length of a printing substrate sheet 02 shown in a screen mask.
For reduced adjustment effort, however, a variant is advantageous in which the position in the direction of transport or the longitudinal direction and the width of a phase PON or, where applicable, even of a plurality of phases PON is defined on the basis of only one copy 57, and on the basis of this definition, which is based on one copy 57, and using information relating to the number and the position of copies 57 arranged one behind the other on printing substrate 02, the position and length of all the active phases PON is determined. In that case, the information relating to the number and position of copies 57 arranged one behind the other on printing substrate 02 can be available or provided in a variety of ways. For example, specifications regarding the number NY and the length L57 of the copies 57 to be arranged one behind the other on printing substrate 02, or the length L02 of printing substrate 02 that receives the NY copies 57 one behind the other can be used for this purpose. For the specifications, e.g. appropriately configured control elements 74; 76; 72 can be provided. If the printing substrate 02 to be acted on and/or the overall print image is not symmetrical with respect to the transverse extension of drying means 38 and/or with respect to press center M, a specification regarding the corresponding lateral offset ΔM can additionally be provided via, e.g. an additional control element 73.
The definition of the length and position of a phase PON based on one copy 57 can be carried out, in principle, via a concrete specification of the individual phases PON. In the case of a touch-sensitive screen 55, this can be a direct selection of sections of a strip shown true-to-scale in the longitudinal direction in an image of a copy 57. In the case of a touch-sensitive screen 55, the definition can be made by touch. Alternatively, however, it is also possible for the definition of the phase PON based on copy 57 to be carried out by defining the two ends of the active phase PON. In a first variant, this can again be carried out by touching corresponding points on the aforementioned strip. In another variant, the boundaries of the active phase PON can be via appropriately configured control elements, for example by selecting a control element, not specifically shown here, that relates to the parameter to be defined, e.g. the control element that relates to the leading or the trailing end of the active phase PON to be defined, and the definition of said boundaries by either inputting a specific relative position, e.g. using keys of an alphanumeric keypad, or using buttons 68 that adjust the position toward one side or the other.
Regarding the configuration in the transverse direction, it can be possible for one or more groups 38k to be formed for each copy 57. For example, if two or even more spaced-apart image elements 56 or image element groups per copy 57 are to be dried, in which case the spacing justifies a differentiation, for example, then two or even more groups 38k for drying the two or more image elements 56 or image element groups can be definable per copy (see, e.g.
In a third example of the configuration of the dryer device, which is, e.g. a variant of the second example, the above statements relating to the second example apply, with the exception that in this case, the number of dryer elements 38k or groups 38k to be formed is constant, and extends to only one group 38k or track t1 of variable width to be formed, and the width of group 38k or track t1 is based not on the number of copies and the width of one copy, but on the width B02 of the printing substrate 02. In a control panel 88 or screen mask 88 that is comparable to screen mask 88 (see, e.g.
In the third example of the configuration of the dryer device, the configuration of the dryer device in the direction of transport can be embodied according to the first variant of the second example, and can be carried out over only the printing substrate length L02 or a variable correlated therewith. For this purpose, a control element 81 that represents, e.g. the parameter of printing substrate length L02 can be selected, and the size thereof can be adjusted or varied, e.g. via control elements 69 that function as plus or minus buttons, and/or via control elements 67 that are configured as keys of an alphanumeric keypad. As described above, the control elements 72; 81; 73 relating to the specifications regarding printing substrate length 02 can be included in the same or in a different input or screen mask 85; 86; 88.
The embodiment variants for the configuration of the dryer device of the first and second examples of the first embodiment are preferably particularly advantageous in conjunction with a printing press, in particular a security printing press, or a printing unit 19; 23; 19′; 23′ that comprises—e.g. in the manner described above—an imaging cylinder 18; 22; 18′; 22′ having a plurality of imaging printing elements 25; 25′ or groups of imaging printing elements 25; 25′ on its periphery, which are arranged in a plurality of columns spaced equidistant from one another transversely to the direction of transport over a circumferential length that corresponds to the print image length L44, and in a plurality of rows spaced equidistant from one another across a cylinder width that corresponds to the print image width.
In contrast, the variants for the configuration of the dryer device of the third example of the first embodiment are preferably particularly advantageous in conjunction with a printing press, in particular a security printing press, or a printing unit 19″; 23″ that prints onto a printing substrate—e.g. in the above-described manner—e.g. onto a first side and subsequently at least onto the second side, in succession in a planar fashion.
In a second embodiment of a device for configuring the dryer device, in addition to the at least one printing unit 19; 23; 19′; 23′, at the printing point 06; 07; 06′; 07′ of which a print image having a print image length L44 can be printed onto each of the sections of printing substrate 02, in particular printing substrate sheets 02, passing through the printing point 06; 07, in a cycle Z having a cycle length Lz which is fixed based on the printing substrate feed rate at the printing point 06; 07; 06′; 07′, and the dryer device having a dryer 14; 16; 36, situated downstream of printing point 06; 07; 06′; 07′ in the printing substrate path and comprising an integral or multi-part drying means 38, by means of which printing substrate 02 passing through the dryer 14; 16; 36 can be exposed to radiation for the purpose of drying the same, in at least one track t1; ti that extends in the direction of transport of the printing substrate 02, and a control device 37 for controlling the operation of the dryer 14; 16; 36, the printing press also has, in the printing substrate path, a device 89 for image detection and/or analysis, which is connected in terms of signal transmission to control device 37, and by means of which data P regarding the position and/or dimensions of image elements 56 or image element groups that have been applied upstream to printing substrate 02 can be provided to control device 37. The provision of data P is also understood here as a provision of information I(P) that comprises and/or relates to such data P, and where applicable is prepared therefrom.
In that case, control device 37 preferably comprises computing and/or data processing means 48, which are embodied for configuring the dryer device, using the provided data P, with respect to the lateral position and/or width of at least one track t1; ti to be acted on by dryer 14; 16; 36.
Drying means 38 of dryer 14; 16; 36 is preferably embodied in the above-described manner as having a plurality of radiation sources 38k,i, in particular UV LEDs, in which case a relevant group 38k can be formed variably from a plurality of beam or radiation sources 38k,i.
This configuration embodiment is particularly advantageous in conjunction with a printing unit 19; 23; 19′; 23′ contained in the printing press, the imaging cylinder 18; 22; 18′; 22′ of which, e.g. in the aforementioned manner, has a plurality of imaging printing elements 25; 25′ or groups of imaging printing elements 25; 25′ on its periphery, which are arranged over a circumferential length that corresponds to print image length L44 in a plurality of columns spaced equidistant from one another transversely to the direction of transport, and across a cylinder width that corresponds to the print image width in a plurality of rows spaced equidistant from one another in the direction of transport.
In the configuration of the dryer device in, e.g. a printing press as described above, in particular a security printing press, that has at least one printing unit 19; 23; 19′; 23′, at the printing point 06; 07; 06′; 07′ of which a print image, in particular precisely one integral or multi-part print image, having a print image length L44 can be printed onto each of the sections of a printing substrate 02, in particular printing substrate sheets 02, passing through the printing point 06; 07, in a cycle Z having a cycle length Lz that is fixed based on the printing substrate feed rate at the printing point 06; 07; 06′; 07′, and wherein a dryer device has a dryer 14; 16; 36, situated downstream of printing point 06; 07; 06′; 07′ in the printing substrate path and comprising an integral or multi-part drying means 38, by means of which printing substrate 02 passing through the dryer 14; 16; 36 can be exposed to radiation for the purpose of drying the same, in at least one track t1; ti that extends in the direction of transport of the printing substrate 02, and a control device 37 for controlling the operation of the dryer 14; 16; 36 is provided, for an ongoing or pending production run, the dryer device is configured with respect to the lateral position and/or width of the at least one track t1; ti to be acted on by the dryer 14; 16; 36 in that said dryer device is adjusted and/or modified—for example, i.a.—using data P underlying or originating from a device 89 for image detection and/or analysis.
In the first variant of the origin of data P, it is possible for information regarding the expected ink pattern of the freshly printed locations, e.g. image elements 57 or image element groups that have been applied upstream, to be supplied to the device 89 for image detection and/or analysis, and for the detection and analysis to be concentrated on these locations. This information can then be made available to control device 37 in the form of data P or in the form of information I(P) that contains these data or has been suitably processed.
In the second variant, such data P regarding the position and/or size of the are obtained upstream with image elements 57 or image element groups (in this case, e.g. applied security features), e.g. by means of device 89 for image detection and/or analysis, e.g. the print image is detected by an image detection device 91, e.g. camera 91, and is processed appropriately by means of an analysis device 92, e.g. camera software that is contained in the camera or in a separate DP means, to generate corresponding data P or information I(P) representing the position and/or size.
Irrespective of the origin of the data P or information I(P), as part of the configuration, the position and/or width of a dryer element 38k that effectuates drying in the at least one track t1; ti is preferably defined and/or modified using data P or information I(P).
Furthermore, in an advantageous refinement, at least one active phase PON, which is shorter than cycle length LZ, is configured with respect to a position and/or length that is based on a cycle Z using data P underlying or originating from device 89.
The dryer device is configured, e.g. such that the printing substrate 02 passing through dryer 14; 16; 36 for the purpose of drying the same is exposed to radiation in a plurality of tracks t1; ti that are spaced from one another. Tracks t1; ti are configured laterally, e.g. using data P regarding the position and/or size of image elements 56 or image element groups that have been or will be applied to printing substrate 02 by printing unit 19; 23; 19′; 23′, in particular in regular rows and columns.
In a first embodiment, the configuration of the dryer device and/or the operation thereof in the direction of transport are carried out such that, e.g. printing substrate 02 passing through dryer 14; 16; 36 for the purpose of drying the same is exposed to radiation for each cycle Z in only one phase PON, which is shorter than cycle Z. In that case, the configuration of a position and/or length of the phase PON is carried out, for example, using specifications that represent a printing substrate length L02.
In a second embodiment of the configuration of the dryer device, which can be selected, e.g. as an alternative to the first embodiment, configuration is carried out, e.g. using data P underlying or originating from device 89, in such a way that printing substrate 02 passing through dryer 14; 16; 36 for the purpose of drying the same is exposed to radiation in a plurality of phases PON of cycle Z that are interrupted by inactive phases POFF.
In an advantageous embodiment of the printing press and the dryer device, the data P or information I(P) come from an analysis device 92 that processes the images from an image detection device 91. In that case, the data P and/or information I(P) comprise, e.g. specifications regarding the position and/or size of image elements 56 or image element groups that have been applied upstream to printing substrate 02.
In particular, it is advantageous for the device 89 for image detection and/or analysis to be embodied as an inspection system 89. Said device is arranged in the printing substrate path downstream of printing unit 19; 23; 19′; 23′, for example, and monitors the printing for predefined quality features. A system of this type is already configured, e.g. for the purpose of inspection and is furnished, e.g. with algorithms for the purpose of identifying the image elements 56, in particular security elements, that have already been printed, and selectively directing the analysis toward said elements. For this purpose, for example, one or more printing substrate sections 02, in particular sheets 02, are imprinted by the press and are analyzed with respect to the image elements 56 in question by means of inspection system 89. During this phase, dryer 14; 16; 36 or drying means 38 is operated continuously over its entire length, for example, but more particularly over at least the printing substrate width B02. Only after verified data P or information I(P) concerning the position and/or dimensions of the image elements 56 or image element groups to be inspected and dried is available is dryer 14; 16; 36 or drying means 38 operated in tracks t1; ti according to the configuration and/or in a clocked manner.
In terms of software or circuitry, a dryer 14; 16; 36 of the second embodiment—in particular to be configured in the above-described manner—can already have, e.g., a fixed or at least predefined number z of zones in the transverse direction, with z∈≧2, in particular ≧3, each of which comprises a fixed or at least predefined number s of radiation segments arranged side by side as described above (single-row or multi-row), with s∈
≧5, in particular ≧8. In that case, the number z of zones corresponds, for example, to the number Nx of copies 57 provided side by side for printing in a standard production run of the printing press, e.g. z=Nx≧3, for example z=Nx=7. The zones are thereby fixed or at least predefined with respect to their lateral position.
In a in a first embodiment—with average resolution—the zones each comprise, e.g. at least 5, preferably at least 8, for example 10 segments. For configuration, each radiation segment of the zone, for example, can be activated or deactivated directly on the representation of one or more zones (see above), for example, or can be selected using the aforementioned control elements, e.g. the corresponding radiation sources 38k,i can be activated by selection using one control bit in one data word per zone.
In a in a second embodiment—having, e.g. increased resolution—the zones each comprise, e.g. at least 50, preferably at least 80, for example 90 segments. In that case, the segments of the zone or even of the entire drying means are numbered consecutively, for example. For configuration, for example, the or each segment can be selected by specifying a right and a left boundary radiation segment (see above), for example the corresponding radiation sources 38k,i can be activated using a start address and an end address of one data word each per—e.g. required—zone.
Both of these embodiments are and/or can be operated in a clocked manner, for example in the manner described above. For this purpose, the segments that are selected during configuration are switched on and off in correlation with and/or synchronized with the press phase position and/or the printing substrate phase position.
The zones are configured in the manner described above via a user interface 55 included in a control console, e.g. by means of one or more appropriately configured screen masks 84; 85; 86; 88, or if an inspection system is provided in the printing press, alternatively from data relating thereto, which can optionally be corrected via a user interface 55.
In addition to this embodiment of configuration using the data P or information I(P) relating to or coming from device 89, an aforementioned user interface 55 can be provided, by means of which a manual adjustment and/or a manual correction can be carried out selectively or for the purpose of correction.
While preferred embodiments of a printing press and method for operating a dryer device that comprises a dryer and a control device for a printing press in accordance with the present invention have been set forth fully and completely hereinabove, it will be apparent to one of skill in the art that various changes could be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2015 205 066.1 | Mar 2015 | DE | national |
This application is the U.S. National Phase, under 35 U.S.C. § 371, of PCT/EP2016/056006, filed Mar. 18, 2016; published as WO 2016/150867A1 on Sep. 29, 2016 and claiming priority to DE 10 2015 205 066.1, filed Mar. 20, 2015, the disclosures of which are expressly incorporated herein in their entireties by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2016/056006 | 3/18/2016 | WO | 00 |
