Patent Application
20090095185
This application claims the priority of German Patent Document No. 10 2007 047 180.9, filed Oct. 2, 2007, the disclosure of which is expressly incorporated by reference herein.
The invention related to a web-fed printing press.
Web-fed printing presses have several printing-plate-based printing units for statically printing at least one printing substrate web surface of at least one printing substrate web with the same printed image for all printed copies of a print job. Each copy is normally comprised of several printed pages. These types of printing-plate-based printing units, which are used for static printing of the or each printing substrate web, are typically designed as offset printing units. It is likewise possible for the printing-plate-based printing units to be designed as gravure printing units.
In a web-fed printing press, it is already known from practice, in addition to the printing-plate-based printing units, which are used for statically printing the or each printing substrate web with a printed image that is the same for all printed copies, to provide at least one processing device for individualizing the printed copies in-line by dynamic printing in addition to the static printing. Such a processing device may be a printing-plate-less printing device such as, for example, an inkjet printing device, in order to print at least one printing substrate web surface of at least one printing substrate web with a printed image that is variable for at least some printed copies, i.e., dynamic. In addition, this type of processing device may be a coating device or a gluing device or a laser cutting device or a foil transfer device or a perforating device or an imprinting device for RFID or odorous substances or invisible ink or the like.
In the case of web-fed printing presses that have at least one printing-plate-based printing unit for statically printing at least one printing substrate web and at least one processing device for the in-line individualization of at least one printing substrate web, the control-side integration of the or each processing device into the web-fed printing press causes problems, namely particularly when an already existing, conventional web-fed printing press, which up to now has been comprised exclusively of printing-plate-based printing units and no processing devices such as, for example, printing-plate-less inkjet printing devices, is supposed to be retrofitted with at least one such processing device. In this case, there are no possibilities on the existing printing press control system for making control commands available to the or each processing device.
Starting herefrom, the present invention is based on the objective of creating a novel web-fed rotary printing press.
According to the invention, the or each processing unit is respectively assigned a sensor, which automatically measures a statically printed printing substrate web and, depending upon the measurement of the printing substrate web, triggers the respective processing device in order to position the processing to be performed with the processing device, in particular the to-be-printed dynamic printed image, in the transport direction and/or transverse to the transport direction of the printing substrate web at the desired position on the printing substrate web, wherein the or each processing device is assigned an operating device in order to make control commands available to the or each processing device independent of a printing press control system.
The advantage of the present invention is that the or each processing device, which is preferably used for individualizing at least one statically printed printing substrate web, is independent of a printing press control system, because it is possible to make control commands available individually for the or each processing device via an operating device without the aid of the printing press control system. The statically printed printing substrate web is measurable via a sensor assigned to the respective processing device, wherein the respective processing device may be triggered depending upon the measurement of the respective printing substrate web. If the sensor is not able to automatically determine a transport speed of the respective printing substrate web, the respective processing device requires the transport speed of the respective printing substrate web as the only input variable from the web-fed printing press. Otherwise, the or each processing device is self-sufficient on the control side so that, when retrofitting an existing web-fed printing press, no changes to the printing press control system are required. It is possible in a simple manner to retrofit existing web-fed printing presses with processing devices preferably for individualizing statically printed printing substrate webs.
Preferred developments of the invention are yielded from the following description. Without being limited hereto, one exemplary embodiment of the invention is described in greater detail on the basis of the drawing.
In the following, the invention will be described, making reference to
However, the invention is not limited to this application case. In fact, other processing devices such as a coating device or a gluing device or a laser cutting device or a foil transfer device or a perforating device or an imprinting device for RFID or odorous substances or invisible ink or the like may also be integrated into a web-fed printing press within the scope of the invention.
After printing the printing substrate web 12 in the area of the printing unit 10, the printing substrate web 12 may be diverted at a guide roller 13 in such a way that, following the guide roller 13, the printing substrate web 12 is essentially transported in the horizontal direction in order to thereby convey the statically printed printing substrate web 12 to an inkjet printing device 14, which is used to dynamically print a printing substrate web surface of the printing substrate web 12 with a printed image that is variable at least for some printed copies. This makes it possible to individualize the static printed image printed in the printing unit 10.
The inkjet printing device 14 is assigned a sensor 15, which automatically measures the visible printing substrate web surface of the printing substrate web 12 that is printed with a static printed image, wherein, on the one hand, a transverse offset is automatically determined for the inkjet printing device 14 depending upon the measurement in order to position the printed image to be printed with the inkjet printing device 14 transverse to the transport direction of the printing substrate web, as viewed from the desired position on the printing substrate web 12 or a corresponding printed page, and wherein, on the other hand, a triggering signal for the inkjet printing device 14 is automatically determined depending upon the measurement of the printing substrate web 12 in order to position the printed image to be printed with the inkjet printing device 14 in the transport direction of the printing substrate web, as viewed from the desired position on the printing substrate web or the corresponding printed page.
Consequently, the dynamic printed image to be printed by the inkjet printing device 14 is able to be positioned via the sensor 15 in the transport direction of the printing substrate web 12 and transverse to the transport direction of the printing substrate web 12 at a desired position on the printing substrate web 12.
The inkjet printing device is assigned an operating device 16 that is independent of a printing press control system in order to make control commands available to the inkjet printing device 14 independent of the printing press control system. In this case, the operating device 16 according to
The computer unit 17 generates control commands for the inkjet printing device 14 on the basis of the data entered via the data entry and display unit 18.
Consequently, a web-fed printing press is provided by the invention, wherein the inkjet printing device 14 that is integrated into the web-fed printing press is self-sufficient on the control side and consequently does not require an interface to a printing press control system, in particular to a central control console of the web-fed printing press. The position of the dynamic printing in the transport direction as well as transverse to the transport direction of the printing substrate is automatically and self-sufficiently determined by the sensor 15 assigned to the inkjet printing device 14. Control commands for the inkjet printing device 14 are able to be made available self-sufficiently via the operating device 16 that is independent of the printing press control system. The transport speed of the printing substrate web 12 is the only additional information, which the inkjet printing device 14 requires for proper operation.
The sensor 15 is able to automatically determine the transport speed of the printing substrate web 12 either automatically, or a printing unit 10 positioned upstream from the inkjet printing device 14 makes the transport speed of the printing substrate web 12 available to the inkjet printing device 14. In the case in which the sensor 15, during the measurement of the printing substrate web 12, measures printed marks with a predetermined distance on the printing substrate web, the transport speed of the printing substrate web 12 may be automatically determined by the sensor 15 from the distance of the marks as well as the time between two successive marks. If the precision of this speed determination is not sufficient then it is possible to fall back on a speed signal provided by the printing unit 10 used for the static printing.
The operating device 16 may be used to input, for example, correction commands as control commands for the inkjet printing device 14 in order to correct the position of the dynamic printing of the printing substrate web 12 determined by the sensor 15 in the transport direction as well as transverse to the transport direction of the printing substrate web 12.
In addition, it is possible to input the target position for the dynamic printing by the inkjet printing device 14 with respect to the to-be-measured marks of the printing substrate web 12 as a control command via the operating device 16. In addition, a start command or a stop command for the inkjet printing device 14 may be made available via the operating device 16. Furthermore, maintenance and servicing functions may be invoked using the operating device 16 for the inkjet printing device 14. In addition, status messages and error messages as well as operating tips may be visualized on the operating device 16.
In the case in which the web-fed printing press is comprised of several inkjet printing devices 14 with corresponding sensors 15, control commands may be made available via a common operating device 16 for all inkjet printing devices 14, wherein the operating device 16 may be used to select the inkjet printing device 14 for which current control commands are supposed to be made available.
With the inventive design of a web-fed rotary printing press, it is possible to retrofit existing web-fed rotary printing presses whose printing press control systems are not designed for the integration of inkjet printing devices for dynamic printing of printing substrate webs but only for static printing of the same, with a low expense with inkjet printing devices, because it is possible to make control commands available via the separate operating device for the or each inkjet printing device independent of the printing press control system. Via the sensor of the respective inkjet printing device, the same automatically determines the position for the dynamic printing of the printing substrate web in the transport direction as well as transverse to the transport direction of the printing substrate web. Any speed signal concerning the transport speed of the printing substrate web that may still be required is either determined automatically by the sensor or made available by a printing unit, which is used for the static printing of the printing substrate web.
List of Reference Numbers:
The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2007 047 180.9 | Oct 2007 | DE | national |
