Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/08—Cylinders
  • B41F13/10—Forme cylinders
  • B41F13/12—Registering devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F33/00—Indicating, counting, warning, control or safety devices
  • B41F33/0081—Devices for scanning register marks

Definitions

• the invention relates to a method for registering a roation printing machine with a plurality of inking units.
• Register corrections to the substrate webs between longitudinal and transverse registers have revolutionized the possibilities of registering.
• the provision of affordable sensor or camera systems has significantly improved the ability to provide readings even during the printing process.
• Another way of distinguishing prior art registration methods is to consider the reference quantities used to determine the deviation of the position of the printed images from their desired position. By this differentiation possibility can be distinguished between train-rail method and rail-cylinder method.
• the web-web process for example DE 199 17 773 A1
• these parts of the monochrome print images are register marks that are specially printed for this purpose by each inking register marks. Due to the detected deviation of the position of the images of their target position correction signals are generated, the drives of the Actuate printing plate cylinder until the deviation of the position of their monochrome print images on the substrate is within a tolerance range.
• One of the weak points of this method is that registration can not occur when register marks are printed one above the other.
• the object of the present invention is to propose a register method that can manage with fewer sensor systems.
• the invention is based on a web-cylinder method and solves the problem in that during the register process one after the other
• Plunger cylinder is in printing position that the at least one sensor station in each case records the resulting monochrome print images and - that the correction signals for the one or more actuators of a
• Platen cylinder and the information about the rotational movements of at least one printing plate cylinders are obtained.
• the method according to the invention is particularly suitable for pre-registering.
• the pre-registration can be carried out particularly well here in an automated form.
• a camera system that is positioned in the web running direction behind the last inking unit inking system is sufficient.
• On the printing of register marks may possibly be completely dispensed with.
• the information about the rotational movements are often present in the form of trigger signals.
• all other types of sensor output signals - whether digital or analog, trigger signal or encoder signal - are conceivable.
• the correction signals can be present in any conceivable form.
• register methods of the prior art they bring about a brief acceleration (increase or decrease in the peripheral speed) of the controlled cylinder, so that it approaches its desired position.
• the position of the printing cylinder is changed transversely to the direction of the printing material.
• a printing cylinder is usually located in the pressing position and produces monochrome printed images which are recorded by the at least one sensor station. Similar to a cylinder-web method, the position of the monochrome print image on the substrate at a time - when recording the print image by the sensor station - is related to information on the rotational movements of printing plate cylinders as their angular position plotted against time. In this case, the information mentioned to a certain extent generates a temporal coordinate system with which the angular position of printing cylinders in relation to the recording time of the image can be set by the sensoration.
• This temporal coordinate system then allows the comparison of the position of the single monochrome print images, which at different times of the at least one sensor station are recorded.
• the information about the rotational movements of printing plate cylinders may be, for example, averaged information about the rotational movements of a group of printing plate cylinders. Most likely, however, is that information be taken about the rotational movement of a single plate cylinder - preferably the one that is first set to the printing position. This pressure plate cylinder can then continue to turn during the entire register process and thus help to generate the information - for example, one trigger signal per revolution.
• a preferred field of application of the method is the pre-registering of particular Zentraizylindermaschinen. Especially when used as a pre-register method, the method can be combined with other methods that register during the printing operation.
• register operations according to the invention are also conceivable during ongoing printing operation. If the images recorded by the sensor station are displayed on a screen, then it is advantageous for the machine operator if the display produces, for example, a linear relationship between a desired position of an image and the image.
• the register process is carried out as follows: Firstly, a first printing plate cylinder - "master cylinder" - is brought into printing position, and its angular position is corrected by correction signals, which in this example trigger the operator by pressing a button, until the front edge of the monochrome print image of the As shown, this means that the leading edge of the monochrome image reaches the screen mark when the trigger signal indicates the completion of one revolution of the master cylinder, after which the master cylinder is turned off from the print position but further rotated in the parked position.
• the machine operator adjusts the angular position of the other cylinders one after the other with further correction signals so that, with each recording, that is, with each trigger signal of the master cylinder with its front edge, they also rest against this marking In this way, the angular positions of all printing plate cylinders are brought into line with that of the master cylinder.
• the distance of the print image from the mark is displayed linearly on the screen to facilitate the operator's work.
• the angular position of all printing plate cylinders is well adjusted to each other.
• the control device can then calculate the correction signals which ensure that these two markings are printed on the printing substrate web in such a way that they are printed one above the other at a specific angular position of the master cylinder (s). The same can be done without machine operator if a control device sets such markings, or if it uses specific points in the monochrome print images for the described purpose. It is advantageous if a printing press for carrying out the method according to the invention contains control devices with which a part of the illustrated and claimed methods can be carried out automatically.
• a rotary printing press for carrying out the method according to the invention is generally equipped with sensor arrangements which are passed by the printing substrate after the last inking unit arranged on the impression cylinder, since sensor arrangements arranged in this way can receive the print images of all these inking units.
• FIG. 1 shows a functional sketch of a central cylinder flexographic printing machine 3 during the execution of a print job to which all six inking units Fn are required. Therefore, all printing plate cylinders D1 to D6 are shown in their printing position.
• the arrow 5 symbolizes the recording direction of the sensor station S.
• the point P illustrates the location of the printing material on which the screen mark 8 is located on the screen 7 of FIGS. 4 to 6.
• FIG. 2 shows the same functional sketch at the beginning of an example of a register method according to the invention. Only the printing cylinder D1 is employed on the counter-pressure cylinder 2, and prints the printing material web 1 with a monochrome print image 6. In FIG. 3, the register process has progressed further. The registration has already been carried out on the plate cylinders D1 to D4. These cylinders D1 to D4 were turned off again after their registration by the counter-pressure cylinder 2 and continue to rotate at the same speed. In the moment shown in FIG. 3, only the printing plate cylinder D5 prints. The registration of the cylinder D6 is still pending.
• Suitable sensors on the first registered printing plate cylinder D1 provide a trigger signal at each completed rotation of this cylinder, which causes the sensor assembly S, an image of the printing material web take.
• the cylinder D1 thus assumes a master function.
• Figure 4 shows a schematic representation of an image on the screen 7. In the image, the substrate web 2 with its 2 edges 11 can be seen, which carries the monochrome print images 6a to d. The image has been recorded by the sensor array S before registering. For this reason, the front edge of the monochrome printed image 6c in the transport direction of the web z is still spaced from the screen mark for the longitudinal register 8.
• This screen mark corresponds to the illustration of the position of the screen mark P and may well be fixedly mounted on the machine frame.
• FIG. 6 shows a screen 7 on which printed images 6, which originate from different inking units, are shown at the same time.
• the so-called addition process is performed at the beginning of a print job.
• this setting-up process is generally carried out similarly to the register process explained with reference to the figures in that the individual inking units successively produce monochrome print images which are preferably recorded by a sensor arrangement arranged downstream of the web 2 in the direction of travel of the last printing unit Dn.
• the images 6a-d recorded by the sensor array are examined.
• the provisioning process is regulated.
• the images obtained in this way can also be used for a register process according to the invention. Therefore, all possible combinations of Beistellmaschine described in US 6,634,297 B2 and claimed in this document register method are considered advantageous.
• the two methods rely on the same or similar hardware components.
• Such register processes in which then monochrome print images but, for example, two-color print images are evaluated, would be faster to perform than due to monochrome print images performed procedures.
• This method would advantageously use one or more cameras that can resolve the spectral regions of monochrome print images from one another in a multicolored print image. This appears to be possible in particular due to the reflected light of the areas of the multicolor printed image in which only one color has been applied. In the areas in which two or more printed images have been printed on top of each other, an evaluation of the multicolor printed image appears more difficult. With an eight or ten-color print image, such areas will be harder to find than in a two- or three-color print image. Under the conditions outlined, it is also possible to make the provision described in US Pat. Nos.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Rotary Presses (AREA)
• Shift Register Type Memory (AREA)
• Communication Control (AREA)

Applications Claiming Priority (2)

Publications (3)

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• 2005
  • 2005-02-03 DE DE102005004972A patent/DE102005004972A1/de not_active Ceased
• 2006
  • 2006-01-19 DE DE502006001240T patent/DE502006001240D1/de active Active
  • 2006-01-19 EP EP06706321.4A patent/EP1843898B2/fr active Active
  • 2006-01-19 US US11/883,707 patent/US7966935B2/en not_active Expired - Fee Related
  • 2006-01-19 AT AT06706321T patent/ATE402816T1/de not_active IP Right Cessation
  • 2006-01-19 ES ES06706321T patent/ES2308716T5/es active Active
  • 2006-01-19 WO PCT/EP2006/000480 patent/WO2006081950A1/fr active IP Right Grant

Non-Patent Citations (1)

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