Different problems can be present in the transport of a printing substrate web to an electrographic printing device. For example, problems occur when the printing substrate web is delivered from differently arranged sources, for example from differently arranged printing substrate web stacks or from another printing device or from different types of printing substrate webs (a printing substrate web of a different width, pre-folded). In order to prevent web tears or web loops of the printing substrate web that are too large, storage buffers for the printing substrate web are provided. In a printing device a storage buffer is also required in order to have a sufficient reserve of printing substrate web upon starting and stopping the printing device. In particular, due to the re-proofing calculated for the pages in the retraction required in the printing device (for example in color printing), based on the start ramp-up to reach the printing speed a reserve amount of printing substrate web must be held back in order to avoid a tearing of the printing substrate web.
It is known (for example WO 98/39691 A1 or U.S. Pat. No. 6,246,856 B1) to solve this problem with the aid of what is known as a dancing roller arranged in a reserve buffer, a roller resting freely directed on the printing substrate web. If a loosening of the printing substrate web (a sagging of the printing substrate web) occurs in operation, this is drawn by the weight of the dancing roller into the reserve buffer and a loop is therefore formed. For example, this can be executed (for example DE 10 2004 002 232.1-51) such that sensors scanning the loop are arranged in the reserve buffer, which sensors output sensor signals indicating the length of the loop that are used to control the transport of the printing substrate web.
U.S. Pat. No. 6,068,172 A describes an electrographic printing device with a printing substrate transport device. A drive unit (made up of two drive rollers 12, 13) that transport the printing substrate into the printing device are provided outside the printing device. The printing substrate web is supplied in the printing device via a tension spring to a pendulum and from there arrives via deflection rollers at the transfer printing station in which the toner images are transfer-printed onto the printing substrate. After the transfer printing station an additional drive unit is provided that draws the printing substrate from the transfer printing station. The printing substrate conveyed by the drive unit into the printing device is supplied, tensioned by the tension spring, to the pendulum. The drive unit is thereby controlled by the tension of the printing substrate since the wrap angle of the printing substrate around the rollers is changed depending on the tension of the printing substrate. Depending on this angle, the drive motor for the rollers is regulated such that the deflection of the pendulum is between the end positions of the pendulum.
A device with which paper sheets can be laterally aligned arises from U.S. Pat. No. 3,436,002 A.
US 2005/158099 A1 discloses a device that is arranged at the output of a printing device in order to prepare the printing substrate for the processing by a post-processing apparatus. The printing substrate is initially supplied to a buffer storage, and arrives from there at a smoothing device. The printing substrate is subsequently moistened in a moistening device and is finally cooled in a cooling device. The printing substrate is subsequently supplied to the post-processing apparatus.
JP 09 086742 A describes a paper transport device in which the paper web is extracted from a storage roll, is directed via a brake to a buffer consisting of a spring, and subsequently arrives at a feed unit. The goal is to keep the paper web tensioned at the start of the feed of said paper web. This is achieved in that a slack of the paper web is accepted by the buffer and is additionally braked before the buffer. The paper web is therefore supplied to the feed unit in a tensioned state.
EP 0 756 215 A shows a device with which a printing substrate web can be cleaned on both sides. For this the printing substrate web is directed in an S-shape past cleaning rollers.
U.S. Pat. No. 5,540,146 A describes a device with which a printing substrate web can be laterally aligned. The alignment occurs with the aid of a sensor that scans the edge of the printing substrate web. The printing substrate web is mechanically aligned depending on the scan signal.
DE 27 21 003 A discloses a transport device for a printing substrate web via which a deviation and a zigzag movement of the paper web during the feed can be corrected.
GB 2 023 553 A shows a buffer storage with a negative pressure chamber at whose floor is arranged a vacuum pump that generates in the chamber a negative pressure via which the paper web is drawn into the chamber. A drive unit for the paper web is provided at the input of the chamber (as viewed in the transport direction of the paper web). The drive unit is arranged at a distance from the chamber.
A buffer device for a belt with two buffer stores situated in series, between which is arranged a drive drum that can be driven in both directions, arises from GB 1 469 844 A. The buffer stores are realized as negative pressure chambers in which respective sensors for scanning the loop length are arranged.
U.S. Pat. No. 3,464,610 A describes a paper transport device with a vacuum chamber in which sensors to scan the loop length are provided. A vacuum source is arranged on the floor of the chamber. A channel in which a negative pressure is generated is provided in the outer wall over which the paper web is drawn (by a drive unit), via which negative pressure an air cushion is formed at the end of the channel and at the input of the vacuum chamber over which the paper web is directed to the drive unit.
A buffer for a belt arises from U.S. Pat. No. 4,199,766 A. The belt is drawn into the buffer by the force of gravity. A gas cushion exists at the floor of the buffer.
U.S. Pat. No. 3,829,080 A shows a buffer storage that operates with negative pressure. The vacuum source is arranged at the floor of the buffer memory. A channel via which an air cushion is formed under the paper web before this is supplied to the drive unit is provided in the side wall.
FR 2 385 627 A describes a chamber through which a belt is directed downward through an opening at the floor of the chamber. The chamber is executed at an angle at the floor.
US 2003/039496 A1 deals with a printing in which a buffer storage is arranged before the transfer printing station. Three sensors with which the loop length is scanned are arranged in the buffer storage. The unit is arranged at the input of the buffer storage.
U.S. Pat. No. 5,729,817 A describes a color printing device with buffer stores that are realized as loop pullers.
US 2003/188647 A1 shows a printing device that has at an input an input module with a tensioning device for the paper web.
A regulation for transport of a printing substrate web in an electrographic printing apparatus is known from DE 10 2004 002 232 A1 or the corresponding US 2005/158099 A1.
The printing module M2 contains (as an example) two electrophotography units E1 and E2 of known design that respectively generate toner images of images to be printed on a photoconductor belt; these toner images are transfer-printed onto transfer belts T1, T2, there are collected upon color printing, and finally the toner images are transfer-printed from the transfer belts T1, T2 onto the printing substrate web 10. The functions of the printing module M2 can be individually learned from WO 98/39691 A1.
The toner images are fixed on the printing substrate web 10 (for example with the aid of radiation fixing) in module M3; refer also in this regard to WO 98/39691 A1.
The feed module M1 for the printing substrate web 10 is arranged in the printing device DR in WO 98/39691 A1 or U.S. Pat. No. 6,246,856 B1. It contains a reserve buffer VP with a loop puller 11 that collects a slack of the printing substrate web 10. This is particularly of importance in start-stop operation of the printing module M2 since it can therefore be prevented that the printing substrate web 10 tears. From the feed module M1, the printing substrate web 10 arrives at the internal transport path TW for the printing substrate web 10 within the printing module M2. The feed module M1 can receive new printing substrate web, for example from a printing substrate web stack (not shown in
The feed module M1 according to
An object is to specify a device for the feed of a printing substrate web to a printing device with which the requirements that the printing substrate web can be optimally aligned and fed to the printing device in a tensioned state are met. If, upon stopping the printing process (for example given color printing), printing substrate web is conveyed backward into a slack condition, upon restarting the printing process a shock to the printing substrate web that occurs at the moment at which the printing substrate web tightens again should be prevented.
In a device for supplying a printing substrate web to an internal transport path of the printing substrate web of a printing device, a device accepts the printing substrate web from the printing substrate web source. A drive unit is provided at an output of the device and draws the printing substrate web from the device. A buffer device having a buffer reservoir is provided at an output of the drive unit. The buffer reservoir has a negative pressure device that generates a negative pressure in a buffer reservoir. The negative pressure acts on the printing substrate web to pull the printing substrate web drawn by the drive unit into the buffer reservoir and thereby tensions the printing substrate web before it is supplied to the internal transport path.
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the preferred embodiments/best mode illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, and such alterations and further modifications in the illustrated device and method, and such further applications of the principles of the invention as illustrated as would normally occur to one skilled in the art to which the invention relates are included.
According to a first aspect of the preferred embodiment, the printing substrate web is supplied to the internal transport path of the printing device via a device,
In a preferred exemplary embodiment the guide and tensioning device of the pre-centering device has two round extruded profiles over which the printing substrate web is directed in an S-shape. The pre-centering device can be arranged such that it can rotate to adjust the wrap angle. The pre-centering device can have a braking brush before the guide element or before the extruded profiles, which braking brush produces or establishes a tension of the printing substrate web in the pre-centering device. A suction device can be arranged adjacent to the braking brush.
In a further preferred exemplary embodiment of the first aspect of the preferred embodiment, the buffer device has a buffer reservoir in which a negative pressure is generated by a negative pressure device, which negative pressure acts on the printing substrate web directed over the buffer reservoir. At least one sensor can be arranged in the buffer reservoir with which a loop of the printing substrate web in the buffer reservoir is scanned and whose sensor signal is used to regulate the transport of a printing substrate web in the buffer reservoir.
The pre-centering device can have at least one edge guide mounted to the side of the printing substrate web, which edge guide is adjustable to the width of the printing substrate web.
The drive unit can in particular have a drive roller driven by a step motor and a counter-pressure roller.
In a further preferred exemplary embodiment, a drive is respectively provided in the buffer device and in the transport path of the printing device, wherein the two drives are coupled with one another in terms of their control. Furthermore, one or more deflection and/or guide rollers can be provided within the transport path between the buffer device and the printing device, at which deflection and/or guide rollers sensors are provided that scan the parameters of the printing substrate, for example its transport speed or its acceleration. An additional buffer for the printing substrate web can also be additionally provided by means of rollers designed such that they can move, over which rollers the printing substrate web is directed in a wandering manner, and this buffer as well can also be scanned by means of sensors with regard to the quantity of printing substrate web located in the buffer.
The two drives cited above can advantageously be specifically controlled with the signals of the sensors so that the web tension of the printing substrate web is always within a predetermined range in specific movement states (for example start, stop, run-up or shut-down) in the printing device in order to prevent a tearing of the printing substrate web.
The drive unit can also advantageously be arranged on a side wall of the buffer reservoir of the buffer device.
According to an aspect of the preferred embodiment, a buffer device is provided to take up a printing substrate web in an electrographic printing device in that the buffer device has a buffer reservoir under negative pressure and—viewed in the transport direction of the printing substrate web—a drive unit is arranged at the input of the buffer reservoir to transport the printing substrate web into the buffer reservoir.
According to a preferred exemplary embodiment, a negative pressure device that generates a negative pressure acting on the printing substrate web in the buffer reservoir is provided on the floor of the buffer reservoir. The drive unit can be arranged adjacent to and on the edge of the one side wall of the buffer reservoir via which the printing substrate web is supplied to the buffer reservoir. The upper edge of the other side wall of the buffer reservoir via which the printing substrate web is drawn out of the buffer reservoir by the printing device can in particular be designed to be sloped.
Furthermore, the drive unit can comprise a drive roller. In particular, it can have a drive roller and a contact pressure roller that rests on the drive roller such that it can rotate freely, and/or a step motor.
According to a further preferred exemplary embodiment of the invention, the drive unit comprises a first drive roller arranged at the edge of the one side wall and a second drive roller arranged adjacent to the first drive roller in the buffer reservoir, between which first drive roller and second drive roller the printing substrate web is directed, and which first drive roller and second drive roller rotate in the direction of the inside of the buffer reservoir. The second contact pressure roller can be rigidly arranged, can be adjustable in stages inside the buffer reservoir or even be variably or continuously adjustable inside the buffer reservoir.
According to further preferred exemplary embodiments, the buffer device is arranged adjacent to or removed from an input roller of the printing device. Furthermore, a third drive roller that rotates in the direction of the buffer reservoir can thereby be arranged adjacent to the edge of the other side wall. The third drive roller can interact with the contact pressure roller.
According to a further preferred exemplary embodiment, the drive unit can have a drive roller and a loop puller interacting with the drive roller. Depending on the draw force of the printing substrate web, the loop puller from the buffer reservoir can thereby rest on the drive roller and can establish the contact pressure force of the printing substrate web on the drive roller.
In a further preferred exemplary embodiment, channels for a negative pressure flow via which the printing substrate web are drawn to the edges of the side walls of the buffer reservoir are arranged in both side walls.
The pre-centering device can advantageously be mounted so as to be adjustable relative to the printing device. The pre-centering device can have a guide element that, for example, comprises two round extruded profiles over which the printing substrate web is directed in an S-shape. The pre-centering device can thereby be arranged such that it can rotate in order to establish the wrap angle, in particular around the extruded profiles.
In order to set the tension of the printing substrate web, the pre-centering device can provide a braking element (for example a braking brush) before the guide element or before the extruded profiles. Furthermore, the pre-centering device can have edge guides mounted to the side of the printing substrate web, which edge guides are adjustable to the width of the printing substrate web. A proper guidance of the printing substrate web through the pre-centering device is therefore ensured. If a suction device is arranged adjacent to the braking brush, the printing substrate web can additionally be cleaned.
An advantageous embodiment of the drive unit provides a drive roller driven by a step motor and a counter-pressure roller.
The buffer device can have a buffer reservoir under negative pressure that acts on the printing substrate web. If at least one sensor with which the loop of the printing substrate web in the buffer reservoir is scanned is arranged in the buffer reservoir, the sensor signal can be used to regulate the drive roller.
Via the use of a device made up of pre-centering device, drive unit and buffer device before the internal transport path of the printing device, the course of the printing substrate web in the printing device can be decoupled from external interference variables. The pre-centering device makes the guidance of the printing substrate web insensitive to the manner of how the printing substrate web is provided to the printing device. Furthermore, high process speeds are enabled via the exact control of the feed of the printing substrate web upon starting and stopping the printing substrate web. The printing substrate web is additionally supplied to the printing device with minimal transversal forces and a defined longitudinal force (web tension) via the use of a buffer device before the input of the internal transport path. A more stable travel of the printing substrate web and a good print image registration (for example upon printing a form) thereby result.
The buffer device to take up a slack of the printing substrate web can be arranged in the transport path of the printing substrate web to the printing device, from which buffer device the printing device then can draw the printing substrate web in the printing operation. The buffer device can have a buffer reservoir under negative pressure and—viewed in the transport direction of the printing substrate web—a drive unit arranged at the input of the buffer reservoir to convey the printing substrate web in the printing operation.
An advantageous buffer device has a buffer reservoir that provides at the floor a negative pressure device that generates negative pressure in the buffer reservoir that acts on the printing substrate web, and in which a drive unit is arranged adjacent to and above the one side wall of the buffer reservoir via which the printing substrate web is supplied to the buffer reservoir. The upper end of the other side wall of the buffer reservoir via which the printing substrate web is drawn from the buffer reservoir (for example by the printing device) can thereby be designed in sloped fashion.
In order to regulate the buffer device, sensors that scan the end of the loop of the printing substrate web in the buffer reservoir and generate a sensor signal dependent on the loop to control the drive unit can be arranged in the buffer reservoir.
The drive unit can advantageously be realized as a drive roller. The drive unit can thereby have a drive roller and a contact pressure roller resting on the drive roller in a freely movable manner.
It is advantageous when the drive unit provides a first drive roller arranged adjacent to and above the one side wall and a second drive roller arranged adjacent to the first drive roller in the buffer reservoir, between which first drive roller and second drive roller the printing substrate web is directed, and which first drive roller and second drive roller rotate in the direction towards the inside of the buffer reservoir. The second drive roller can then be rigidly arranged. Or the second drive roller can be realized so as to be adjustable in stages inside the buffer reservoir. Finally, the second drive roller can be variably or continuously adjustable
In this embodiment the buffer device can be arranged adjacent to an input roller of the internal transport path of the printing device.
Adjacent to the upper end of the other side wall of the buffer reservoir, a third drive roller can be arranged that rotates in the direction of the buffer reservoir, or the other side wall of the buffer reservoir can have an air channel via which a negative pressure is exerted on the printing substrate web in the direction of the upper end of the side wall. The buffer device can then be arranged at a distance from the input roller of the internal transport path of the printing device.
In a further advantageous realization of the preferred embodiment, the drive unit can have a drive roller and a loop puller interacting with the drive roller. The contact pressure force of the printing substrate web on the drive roller is set depending on the draw force of the printing substrate web from the buffer reservoir.
Finally, channels for the negative pressure flow via which the printing substrate web is drawn onto the ends of the side walls of the buffer reservoir can be arranged in both side walls.
An embodiment of the device according to the preferred embodiment is shown in
The printing substrate web 10 is fed from the buffer device PV to the internal transport path TW in the printing module M2.
The pre-centering device VZ has the task of feeding the printing substrate web 10, laterally aligned and pre-tensioned, to the drive unit AE. It can be arranged outside of the printing device DR or, depending on the feed type of the printing substrate web, in various ways at the printing device DR. For example, it can be realized with two round extruded profiles situated adjacent to one another over which the printing substrate web 10 is directed in an S-shape. A web tension is thereby already achieved in the pre-centering device VZ. The diameter of the extruded profiles 12 can be 60 mm, for example. In order to be able to adjust a web tension for the most different types of printing substrate web 10, the pre-centering device VZ is arranged such that it can rotate (indicated by the arrow 13) so that the wrap angle for the printing substrate web 10 is adjustable. A braking device (for example a braking brush of known design or, for example, a negative pressure brake) can additionally be arranged before the extruded profiles 12 (not shown in
The drive unit AE arranged after the pre-centering device VZ can have the following technical features:
Sensor devices and drives can likewise be provided within the internal transport path TW of the printing device DR. In the shown exemplary embodiment, a sensor 22c is provided with which the transport speed of the printing substrate web 10 is measured via the unrolling speed of the roller 24b. The input roller 25 is driven via a step motor 25 that is controlled by a controller ST1 that also controls other drives, and therefore the feed of the printing substrate web in the pre-centering device VZ, the buffer device PV and the internal transport path TM up to the transport roller 25 are regulated altogether.
The regulation can, for example, be designed according to DE 10 2004 002 232 A (corresponding to US 2005/158099 A1); see there in particular the statements regarding
The buffer device PV for the printing substrate web 10 has the following features according to
The feed unit can follow the buffer device PV as part of the internal transport path TW of the printing module M2 that, for example, is designed corresponding to
The sensor device 22 in
On the other hand, upon continuing the printing process the printing substrate web 10 is initially drawn from the internal buffer storage 47. If this internal storage approaches the end, the deflection roller 24b successively moves with relatively lesser acceleration due to the spring-mounted, pre-tensioned loop puller. This transport movement of the printing substrate web 10 is thus already detected relatively early by the sensor 22c and with flat slope, and the controller ST1 can start a correspondingly time-accurate, regulated run-up of the drive 17a at the buffer device PV without it leading to excessively high accelerations (and therefore tensions up to the point of tearing of the printing substrate web).
With the sensor 22b in the buffer device it is monitored that the loop 21 is not too small. If the sensor 22b outputs a corresponding signal, the drive 17a is accelerated or the drive 25a is delayed.
The controller ST1 is shown in
An important problem in the feed of printing substrate webs 10 to a printing module M2 is to prevent a slack of the printing substrate web 10. In order to avoid this problem, a buffer device PV independent of printing devices DR can be provided that is executed such that it can be inserted as needed between printing devices DR without having the change the printing devices DR. The buffer device PV can thus accept a slack condition of the printing substrate web 10 (that can occur during start-stop operation, for example) independent of the printing devices. In subsequent
The statements regarding the controller ST2 also apply for the exemplary embodiments of other Figures in which a control of drives (and thus a regulation of the transport of the printing substrate web) occurs by means of sensor signals.
In following
The buffer device PV2 according to
The buffer device PV3 of
In the embodiment PV4 according to
In the embodiment PV6 of
The negative pressure in the buffer reservoir 27 can be generated with the aid of a blower 20 that is arranged in the lower region of the buffer reservoir 27. A revolving perforated belt 46 can be arranged between blower 20 and the remainder of the buffer reservoir 27 in order to avoid friction and to prevent the printing substrate web 10 from being drawn into the blower 20. This is advantageous given solutions in which no regulation of the loop 21 of the printing substrate web 10 occurs.
An arrangement of a perforated unit (for example a perforated wall) above the blower 20 is likewise advantageous in the exemplary embodiments of
The embodiments PV1 through PV6 shown in
The buffer devices PV1 through PV6 can be used in the feed device according to
In addition to the aforementioned sensors, additional sensors can be arranged in the travel region of the printing substrate web to regulate the transport of the printing substrate web. The additional sensors can be arranged in the printing device and/or outside of the printing device. They can be provided before the printing device and/or after the printing device in the travel direction. One or more sensors can be provided in the region of the pre-centering device VZ; and one or more sensors can be arranged in the transport path TW in which a printing group lies. The printing group can operate on an electrical basis; however, it can also be based on other printing principles, for example the inkjet principle or also the offset printing principle. The sensors can respectively monitor the position, the draw tension, the speed and/or variables derived from these, for example the acceleration of the printing substrate web. The more sensors that are provided, the more complex that the regulation process can be; more precisely, the more precisely that the transport of the printing substrate web can be regulated. The statements regarding the sensors also apply for the drives: the more drives that are provided for the transport of the printing substrate web at the respective points within and outside of the printing device, the more precisely that the transport can be regulated (at least per region, but also as a whole).
Although preferred exemplary embodiments are shown and described in detail in the drawings and in the preceding specification, these should be viewed purely as examples and not as limiting the invention. It is noted that only preferred exemplary embodiments are presented and described, and all variations and modifications that presently and in the future lie within the protective scope of the invention should be protected.
Number | Date | Country | Kind |
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10 2007 034 246 | Jul 2007 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2008/059623 | 7/23/2008 | WO | 00 | 1/25/2010 |
Publishing Document | Publishing Date | Country | Kind |
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WO2009/013300 | 1/29/2009 | WO | A |
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Number | Date | Country | |
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