Patent Application
20100206192
The present invention relates generally to web printing presses and more particularly to a system for providing web printing press management.
In certain printing operations, a web is fed from a roll mounted in a splicer to a sequence of printing equipment, which may include a number of different print mechanisms such as an infeed unit, a plurality of printing units, a dryer, a cooling unit, a folder superstructure and a delivery unit. The output of the delivery unit may be a plurality of signatures, formed from folded ribbons, the web being slit into ribbons, each signature having a printed image. The individual signatures may be assembled with other printed signatures to form a final product, such as a newspaper.
Some printing presses are manually reconfigured for different print jobs by way of discrete individual adjustments between different print jobs when the printing press is not in operation. This method of reconfiguration increases the risk of human error and contributes to inefficiency, considerable production down-time and waste of valuable run-time.
It is an object of the invention to provide a printing press which is automatically reconfigured and thus overcomes the problems associated with manual reconfiguration.
The present invention is addressed to a method for automatically controlling a printing press including at least one reconfigurable printing mechanism. At least one reconfigurable printing mechanism is configured to print according to a first set of predetermined printing parameters for a first print job and then the first print job is printed on a first print web. The completion of the first print job detected, at least one reconfigurable printing mechanism is automatically configured to print according to a second set of predetermined printing parameters different from the first set of predetermined printing parameters for a second print job, and the second print job is printed on a second print web. The first print web may be the same size as the second print web, or the first print web may a different size as the second print web.
The present invention is also addressed to a web fed rotary printing press apparatus which comprises at least one printing mechanism which is reconfigurable based on received control signals, a sensor for detecting the end of a print job, and a controller coupled to the sensor and at least one printing mechanism and which provides control signals representing predetermined printing parameters for a subsequent print job to the at least one print mechanism upon detection of the end of a print job. The apparatus may further include a planning computer coupled to the controller for generating printing parameters for each print job based on user input. Furthermore, the printing parameters generated by the planning computer for a print job may be stored as data in JDF files communicated to the controller which may be used to provide control signals representing predetermined printing parameters for a print job based on the data in the JDF files.
In an alternative embodiment, the planning computer functions are included in the controller which also generates printing parameters for each print job based on user input. In this alternative embodiment, the printing parameters generated by the controller may also be stored as data in JDF files and the control signals provided by the controller representing predetermined printing parameters for a print job may be based on the data in the JDF files.
In an embodiment of the invention, at least one of the printing mechanisms is a slitter which can be automatically reconfigured to slit the web at different positions, and the slitter is automatically configured by laterally moving at least one slitter blade in the slitter. Separate actuators may be provided which are associated with each slitter blade for moving the slitter blades laterally. Sensors may be provided which detect the completion of the first print job by sensing predetermined register marks on the first print web or by the job count, for example, good product delivered. The slitter may be moved to a new slit position with the web in motion. The ribbon path to the former would have to remain the same.
The above and related objects, features and advantages of the present invention will be more fully understood by reference to the following detailed description of the presently preferred, albeit illustrative, embodiments of the present invention when taken in conjunction with the accompanying drawings wherein:
The Job Definition Format (JDF) is an industry specification for exchanging product specifications using an Extensible Markup Language (XML)-based file format. JDF files are often used in the printing industry to simplify data exchange between different applications and systems. JDF files allow data communication between a printing press and its management system as well as provide access to print job data and printing press configuration data such as, for example, paper, coverage requirements, colors (inks), web width, ribbon width, web path, ribbon path, product fold, skip/tab slitter requirements and former board position. JDF files are created and sent to the printing press by print planning systems.
Splicer 13 mounts and splices a roll 14 of a new web 12 onto an end of a web 16, which is fed from a mounted roll 15. Rolls 14, 15 may be of any diameter and any width. New web 12 is used in the next print job and web 16 is used in the current print job. In order to attach new web 12 to the depleting, almost used-up, web 16, an adhesive patch may be applied, via splicer 13, to join the two webs.
Upon exiting splicer 13, web 16 travels to infeed unit 17. Infeed unit 17 feeds web 16 to a sequence of printing units 18, 19, 20, 21. The number of printing units is shown in the exemplary embodiment as four, but could be higher or lower, depending on the different job requirements for printing press 100.
Web 16 then travels, in the exemplary embodiment, through dryer 22, which is positioned downstream from printing units 18, 19, 20, 21. Dryer 22 is used to apply heat to the passing web 16 to dry the ink applied by printing units 18, 19, 20, 21. After passing through dryer 22, web 16 is fed to cooling unit 23, for passage between water cooled rollers 24 before entry into folder superstructure 26.
In folder superstructure 26, web 16 is longitudinally slit into a plurality of ribbons 27 by slitters 25, which are movable via operably connected actuators 33 (see
After slitting, ribbons 27 are guided to a roller top of former 28, which is mounted at the infeed of a former board 29. Once ribbons 27 pass over roller top of former 28, ribbons 27 are drawn over former board 29 by infeed rollers 30, which, if driven, may be used to maintain precise web tension in order to minimize web tearing. Former board 29 imparts a longitudinal fold to ribbons 27 as ribbons 27 pass over former board 29. The newly folded ribbons 27 are then cut by a crosscutter 31 into individual signatures and are guided for input to delivery unit 32.
Planning computer 10 is in digital signal communication with controller 11. Planning computer 10 is used to create and send JDF files to controller 11. Planning computer 10 and controller 11 may, alternatively, be embodied in a single unit. Controller 11 may be, for example, a computer or circuitry, such as an application-specific integrated circuit (ASIC). Controller 11 is also JDF data compatible. Controller 11 is programmed to receive and monitor, as inputs, the outputs of various sensors as discussed below with respect to
In one mode of operation, where one roll of web corresponds to a single print job, controller 11, continuously monitors web consumption. Upon detecting the impending depletion of web 16 rolled onto mounted roll 15, controller 11 decreases the speed at which web 16 passes through printing press 100 to a certain setup speed. Then, using sensor data and JDF files, controller 11 determines the amount of web 16 left on mounted roll 15 for the current print job in order to successfully activate web splicer 13 and issues a command to splice the web feed from the depleting mounted roll 15 to the unused roll 14 and adjust the circumferential speed of the newly mounted roll 14 to the printing speed. A conventional tail-cutter may be used to remove the loose end of the new roll 14. Subsequently, using sensor data and JDF files, controller 11 tracks the splicing location of new web 12 to web 16 as new web 12 travels through printing press 100 and timely adjusts the positions of slitters 25 and former board 29 as well as maintain proper web tension via infeed rollers 31 for the new print job.
In an alternative mode of operation, more than one roll of web may correspond to a single print job. In such a mode of operation, upon detecting the impending depletion of the last roll allocated for and used in the currently running print job, controller 11 will proceed in a similar mode of operation as where one roll corresponds to one print job and treat the last roll as web 16.
A plurality of various operation data sensors are included in printing press 100. The sensors are used to sense, monitor and output quality control data for the web that moves through printing press 100. The sensors may include, for example, densitometers, color spectrometers, registration sensors, cut-off sensors and fold sensors. The sensors are strategically positioned throughout printing press 100 and configured to sense, monitor and output operating and product quality control parameters such as, for example, printing press speed, printing press operating events, product image density, ink presets, web tension, register marks, ribbon positions, product fold, former board and slitter positions. The sensors are in digital signal communication with controller 11 or planning computer 10 or both.
Printing press 100 is automatically reconfigured for the next print job if no ribbon path changes take place and if at least two print job configurations are known: a current print job configuration and a next print job configuration. This data is included in two corresponding JDF files: e.g., a first file that corresponds to the current print job and a second file that corresponds to the next print job. The ribbon path data is known to printing press 100 via JDF data. In addition, it is desirable that JDF2 file is available to controller 11 prior to the conclusion of the current print job.
For example, printing press 100 is configured for a presently running print job via a JDF file, e.g., JDF1. When the next print job requires a different printing press configuration, prior to the conclusion of the current print job, a printing press operator utilizes planning computer 10 to create and transmit the JDF2 file for the next print job to controller 11 for processing. Controller 11 processes the JDF2 file and the sensor data and, without stopping printing press 100, automatically reconfigures printing press 100 from the current print job configuration to the next print job configuration. Such reconfiguration may include one or more of the following steps: detecting the impending depletion of web feed from mounted roll 15, slowing printing press 100 to a certain set up speed, activating splicer 13 to splice web 16 from mounted roll 15 to web 12 from roll 14, adjusting the lateral positions of slitters 25 via slitter actuators 33 (see
Slitter 25, in the presently preferred embodiment, includes three slitter blades 25A, 25B and 25C and three associated actuators 33A, 33B and 33C. In this presently preferred embodiment, the three slitter blades 25A, 25B and 25C can be moved laterally via respective operably connected actuators 33A, 33B and 33C. The number of slitters 25 and actuators 33 is shown as three, but as one of skill in the art will readily recognize, could be greater or lesser, depending on the different job requirements for printing press 100.
In the example shown in
In the example shown in
In addition, sensors installed in splicer 13 can alert controller 11 of the splicing of narrow web 201 onto wide web 200. Such alert signal(s) may include, for example, splicing operation data such as the exact time and web speed at which the splicing operation took place. Also, sensors, strategically positioned throughout printing press 100, can notify controller 11 of the current location, within printing press 100, of the edge of narrow web 201 spliced onto wide web 200 and allow controller 11 to track the edge of narrow web 201 throughout printing press 100. Using splicing data, tracking data, JDF files and sensor data, controller 11 can calculate the exact time that narrow web 201 reaches various units within printing press 100 such as, for example, folder superstructure 26. Once that time is known, controller 11, using the sensor data and the JDF files, can calculate the new configuration information including the desired parameters, the timing for readjustment and the rate of readjustment of printing press 100 components such as, for example, slitters 25A, 25B, 25C, former board 29 and infeed rollers 30. When the desired parameters, the timing for readjustment and the rate of readjustment of slitters 25A, 25B, 25C, former board 29 and infeed rollers 30 are calculated, controller 11 issues commands to reconfigure printing press 100.
During printing, wide web 200 moves through printing press 100 at a designated transition velocity V, e.g., one meter per second (1 m/s). The transition velocity V is the maximum speed that is safe for lateral movement of slitters 25A, 25B, 25C without tearing the web or impairing the necessary web tension. The transition velocity V is known to controller 11 via the JDF file or sensor data. The transition velocity V may be different for different types of webs or different print jobs.
In operation, wide web 200 will reach a transition web distance D, e.g., two meters remaining from an end of an almost depleted wide web 200, at a particular point in time. The transition web distance D is the minimum amount of web, when it is traveling at a certain transition velocity V or a minimum setup speed, that is necessary for safe readjustment of slitters 25A, 25B, 25C and former board 29 without tearing the web or impairing the necessary web tension. The amount of transition web distance D is calculated by controller 11 via the JDF file or sensor data. The transition web distance D may be different for different types of webs or different print jobs.
Since the transition web distance D, the transition velocity V, the current position (X1, X2, X3) and desired position (Y1, Y2, Y3) of slitters 25A, 25B, 25C and the print job data and the printing press configuration data for both print jobs are known to controller 11, in operation, controller 11 calculates a transitioning time T and the rate of lateral movement for slitters 25A, 25B, 25C. Once the transitioning time T and the rate of lateral movement for slitters 25A, 25B, 25C are known and the transition web distance D is detected by sensors 204, 205, controller 11 begins to laterally reposition slitters 25A, 25B, 25C for slitting of narrow web 201 from the X1, X2, X3 positions to the Y1, Y2, Y3 positions as disclosed in the JDF2 file.
Three scenarios are possible for transition. First, it is possible that when the web reaches the end of the transition web distance D, slitters 25A, 25B, 25C will have completed their lateral repositioning movement from the X1, X2, X3 positions to the Y1, Y2, Y3 positions. Second, it is possible that slitters 25A, 25B, 25C, located at the positions X1, X2, X3, may not completely reposition to the Y1, Y2, Y3 positions by the time the web reaches the end of transition web distance D, but instead will reach the Y1, Y2, Y3 positions after the transition to narrow web 201. This is possible if the lateral positions of slitters 25A, 25B, 25C are within the width of narrow web 201 at the time when the transition to narrow web 201 reaches slitters 25A, 25B, 25C. In this scenario, the transition time may be extended. Third, it is possible that slitters 25A, 25B, 25C, located at the positions X1, X2, X3, may reach the Y1, Y2, Y3 positions before narrow web 201 reaches slitters 25A, 25B, 25C. In this scenario, the transition time is shortened.
In order to minimize web waste and optimize printing press efficiency, controller 11 will use sensor and the JDF files to determine the optimal method of readjusting slitters 25A, 25B, 25C (before, at or after slitters 25A, 25B, 25C reach the end of transition web distance D) and execute the slitter adjustment accordingly.
In one embodiment, controller 11 uses the formula: T=D/V to calculate the transition time T that it would take for narrow web 201 to travel the transition web distance D at a given transition velocity V. For example, when the transition web distance D is 2 meters and the transition velocity V is 1 meters/second, it will take 2 seconds for wide web 200 to travel the transition web distance D.
The lateral distance LD, which is the amount of lateral movement that each individual slitter of slitters 25 will move from the current positions (X1, X2, X3) to the new desired lateral positions (Y1, Y2, Y3), is also be known to controller 11. In the
In the
The maximum lateral speed of slitters 25A, 25B, 25C will be obtained via known data such as, for example, JDF data for a given web type.
The newly introduced narrow web 201 is advanced through printing press 100 by the preceding wide web 200, which pulls the narrow web 201 as wide web 200 travels through printing press 100.
Reconfiguration of printing press 100, from wide web 200 to narrow web 201, will be accomplished if no ribbon path changes are needed. The ribbon path will be known to printing press 100 via at least one of the JDF files.
In the example shown in
In the example shown in
In addition, sensors installed in splicer 13 can alert controller 11 of the splicing of wide web 301 onto narrow web 300. Unlike the exemplary slitter adjustment in
Upon splicing of wide web 301 onto narrow web 300, sensors installed in splicer 13 can alert controller 11 of the splicing of wide web 301 onto narrow web 300. Such alert signal(s) may include such as, for example, the ramp-cut details, the exact time and the web speed at which the splicing operation took place.
Also, sensors, strategically positioned throughout printing press 100, can notify controller 11 of the current location, within printing press 100, of the edge of wide web 301 spliced onto narrow web 300 and allow controller 11 to track the edge of wide web 301 throughout printing press 100. Using splicing data, tracking data, JDF files and sensor data, controller 11 can calculate the exact time that wide web 301 reaches various units within printing press 100 such as, for example, folder superstructure 26. Once that time is known, controller 11, using the sensor data and the JDF files, can calculate the new configuration information including the desired parameters, the timing for readjustment and the rate of readjustment of printing press 100 components such as, for example, slitters 25A, 25B, 25C, former board 29 and infeed rollers 30. When the desired parameters, the timing for readjustment and the rate of readjustment of slitters 25A, 25B, 25C, former board 29 and infeed rollers 30 are calculated, controller 11 issues a command to reconfigure printing press 100.
During printing, narrow web 300 moves through printing press 100 at a transition velocity V, e.g., one meter per second (1 m/s) and reaches the transition web distance D of two meters remaining from an end of an almost depleted narrow web 300 at a particular point in time. The transition web distance D, the transition velocity V, the current position (X1, X2, X3) and the desired position (Y1, Y2, Y3) of slitters 25A, 25B, 25C and the print job data and the printing press configuration data for both jobs are known to controller 11. Thus, controller 11 calculates the transitioning time T and the rate of lateral movement for slitters 25A, 25B, 25C. Once the transitioning time T and the rate of lateral movement for slitters 25A, 25B, 25C are known and the transition web distance D is detected by sensors 306, 307, controller 11, if necessary, begins to laterally reposition slitters 25A, 25B, 25C, for slitting wide web 301, from the X1, X2, X3 positions to the Y1, Y2, Y3 positions as disclosed in JDF2 file.
The same three scenarios exist with respect to the transition of the slitters, except that if any of the slitters need to be positioned to a point outside the dimension of the current web, the transition will never take less than time T.
The
As with the
While the present invention has been particularly shown and described with reference to the preferred embodiments and various aspects thereof, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. It is intended that the appended claims be interpreted as including the embodiments described herein, the alternatives mentioned above, and all equivalents thereto.
