DE102015208179A1 - Method for operating a sheet-fed printing machine with multiple printing units - Google Patents

Abstract

The invention relates to a method for operating a sheet-fed printing press with a plurality of printing units, wherein the respective printing unit has at least one plate cylinder, on the plate cylinder, a printing plate is clamped and the plate cylinder for this purpose is suitable for clamping the printing forme, arranged in a clamping channel clamping elements, for the Plate cylinder a accessible to the operator rotation angle range of the clamping channel is stored in a control of the sheet printing machine or this is calculated on the basis of information stored there and the printing unit is stopped so that the clamping channel of the plate cylinder comes to a standstill in this rotation angle range, wherein adjusting the printing plate for register correction of at least one printing unit of the plurality of printing units is performed at standstill.

Description

The invention relates to a method for operating a sheet-fed printing press with a plurality of printing units according to the preamble of claim 1.

In such a sheet-processing machine, in particular sheet-fed printing machine, it comes during printing in the sheet by moisture and / or Walk operations to a rolling out of the printing material at the ends. This rolling increases from one printing unit to the next, so that it is necessary to adapt the printing plates of the individual printing units to achieve a register accuracy of the deformations of the sheet. For this purpose, the pressure plate end receiving clamping rail is partially displaced in the circumferential direction and so realized an expansion of the printing plates in this direction. It is often spoken of a stretching of the printing plate. For stretching in the axial direction with respect to the plate cylinder, a clamping rail consisting of several clamping elements is used, wherein the individual clamping elements are displaced in the direction of the edges of the printing plate.

During the print run sample sheets are drawn and checked for compliance with the color register. So it can be determined on which printing unit related adjustment processes are required.

From the DE 10 2007 057 455 A1 such a solution is known. There it is proposed to equip the pressure plate cylinder carrying the printing plate and provided with a blanket transfer cylinder of a printing unit with actuators. The actuators are arranged in the cylinder channels and engage the leading edge and trailing edge of the pressure plate and the blanket. Furthermore, actuators are provided in the jacket of the cylinder recessed in the side region, which act on the side edges of the pressure plate or the blanket. The sheet-fed printing machine is associated with a control panel, which is provided with an image inspection device, which is suitable for the geometric measurement of reaching for processing sheet-shaped printing materials. The image inspection device communicates with the controller and a computer which processes the measurement results of the image inspection device and performs a target-actual comparison. If deviations from the nominal value occur in this comparison, the actuators are controlled in such a way that the deviations ascertained are minimized or compensated.

A disadvantage of this solution is the high technical complexity.

From the EP 0 534 214 A1 For example, a method and apparatus for correcting trapezoidal register deviations is known. In this case, the trailing edge of the printing plate is clamped to at least two sections and then a trial print is carried out to determine register deviations. The correction of this register deviation then takes place by pulling the two sections apart in the axial direction. Corresponding devices are present at manually operable Platteneinspannungen. These can apply a high clamping force, which is not possible with automatic plate clamping. In order to be able to correct such a register error even with a Platteneinspannung with less clamping force, it is proposed here to apply before the correction, the two sections with an additional clamping force.

The DE 690 22 378 T2 , the DE 195 31 024 A1 , the DE 10 2007 049 453 A1 , the DE 10 2004 039 536 A1 , the DE 10 2012 014 806 A1 and the DE 42 23 583 A1 disclose methods for printing plate change in which the plate cylinder is positioned at predetermined angular positions.

This solution leads to an acceptable result, but requires a lot of time.

The invention is therefore an object of the invention to provide a method for operating a sheet-fed press with multiple printing units.

Preferably, the finding of a simple technical solution is the basis, in which the time required for manually stretching the clamped pressure plate is significantly reduced. This solution should also be applicable to the re-tensioning of lifts of any kind on cylinders of printing presses.

The object is achieved by the features of claim 1.

With reference to several embodiments, the invention will be explained in more detail below. The accompanying drawing shows the schematic representation of three printing units as processing units of a sheet-fed press. However, the invention is not limited to three printing units. In addition to these printing units, coating units can also be used as further sheet processing units. Other embodiments of machining units in sheet-processing machines can, for. B. machining cylinder for punching or perforating or Folierwerke be.

1st embodiment

The part of a sheet-fed printing press shown in the drawing shows printing units 1 . 2 . 3 that with directly driven plate cylinders 4 are equipped. As each of the three printing units 1 . 2 . 3 is constructed the same, the details below only on the basis of one of the printing units 1 . 2 . 3 designated and described.

As can be seen in the figure, each of the three printing units has 1 . 2 . 3 one plate cylinder each 4 on. On each of the three plate cylinders 4 is ever a printing plate (not shown) clamped. For this purpose, each plate cylinder 4 with a clamping channel 5 fitted. In the tensioning channel 5 are arranged for tensioning the pressure plate suitable clamping elements. In particular, at least one holding element at the beginning of printing and at least one holding element at the end of printing in the clamping channel 5 arranged. The at least one retaining element at the printing end is movable by means of at least one clamping element.

In the illustrated embodiment, each printing unit 1 . 2 . 3 a plate cylinder 4 on which a separate drive M is assigned.

For coloring the printing plate is an inking unit 6 intended. Furthermore, a dampening unit 7 to the plate cylinder 4 to obtain the color / water balance required for printing.

The plate cylinder 4 is a rubber cylinder 8th assigned to a tensioning channel 13 having. In the tensioning channel 13 are clamping elements for tensioning a blanket on the outer surface of the blanket cylinder 8th intended.

The rubber cylinder 8th has contact with a sheet-guiding impression cylinder 9 , Between the counter-pressure cylinders 9 two printing unit 1 . 2 . 3 is ever a bow-carrying transfer drum 10 provided by which the sheets of printing unit 1 . 2 . 3 to printing unit 1 . 2 . 3 in the sheet transport direction 11 be transported.

The printing units 1 . 2 . 3 is an unillustrated sheet feeder upstream and downstream of a likewise not shown sheet delivery.

The impression cylinder 9 , the transfer drums 10 , the rubber cylinders 8th and preferably the inking units 6 The sheet-fed printing machine shown here are driven by at least one main drive. These are the drives M of the plate cylinder 4 synchronously trackable during printing.

At least the impression cylinder 9 , the transfer drum 10 and the rubber cylinders 8th are driven by a common Zahnradzuges of at least one main drive.

According to the sheet-fed printing machine is equipped with a control in which for each plate cylinder 4 a rotation angle range of the tensioning channel accessible to the operator 5 is stored in the controller. This is to be understood as meaning the rotation angle range which, after opening, is attached to a cover of the sheet-fed printing press 12 is accessible to the operator so that he can perform operator actions there.

Preferably, the at least one tensioning element and / or retaining element is accessible at the end of printing in this rotation angle range.

If the sheet-fed printing machine is equipped with a turning device, then information is stored in the control, on the basis of which the angle of rotation range of the clamping channel accessible to the operator 5 can be calculated.

The inventive method is realized as follows: At the beginning of the print job, the inking rollers of the inking unit 6 from the plate cylinder 4 turned off and the contact between the plate cylinder 4 and the rubber cylinder 8th is canceled (see figure). The rubber cylinder 8th is from the impression cylinder 9 switched off.

To process a print job, the inking rollers of the inking unit 6 employed and the contact between the plate cylinder 4 , Rubber cylinder 8th and impression cylinder 9 is produced. During this trial printing operation, the inked printing plate transfers the ink over the blanket cylinder 8th on the on the impression cylinder 9 guided print sheet. In this Andruckphase sheets are removed to check the register accuracy of at least parts of the printed image. The checking is done visually. In another variant, the register deviations are determined by sheet inspection. For this purpose, at least one or more sensors, in particular at least one or more cameras, are / are provided.

A register registration detecting sensor may be assigned in particular the printing press and / or a control station of the printing press. With the sensor associated with the printing press, at least parts of the at least one sheet are detected in the printing machine during the printing. With the sensor associated with the control station, at least parts of the at least one sheet lying on the control station are detected by the same order, in particular that which is currently being printed.

Upon detecting a register deviation in the printed image, the sheet-fed press is stopped. Usually the sheet travel is interrupted. The printing unit affected by the register deviation 1 . 2 . 3 (eg the printing unit 1 ), or all affected printing units 1 . 2 . 3 (eg the printing units 1 . 2 ) are identified and communicated to the controller.

Alternatively to stopping the entire sheetfed press can also be provided, the remaining printing units 2 . 3 respectively. 3 continue to run and only the identified printing units 1 respectively. 1 . 2 to stop.

Stopping the affected printing units 1 . 2 . 3 (eg the printing units 1 . 2 ) happens as follows:
In a first step, the synchronous tracking of the plate cylinder 4 of the printing unit 1 . 2 canceled the sheetfed press. Now, in a second step, the plate cylinders 4 so stopped that the tensioning channel 5 of the plate cylinder 4 the identified printing works 1 . 2 comes to a standstill in a range accessible to the operator rotation angle range. This rotation angle range is known from the controller or can be calculated from the data stored there. The movement takes place by the drive M of the plate cylinder 4 ,

In another variant of the invention, the synchronous tracking of all printing units 1 . 2 . 3 interrupted and the sheet-fed press is stopped so that the clamping channels 5 all plate cylinders 4 located in the range accessible to the operator rotation angle.

After the plate cylinder or cylinders 4 have come to a standstill in the above-described situation, preferably opens the cover automatically 12 and grants the operator and / or the operator (s) access to the respective chuck channel 5 , In another variant of the invention, the identified, now come to a standstill printing unit 1 . 2 or printing works 1 . 2 signal technically displayed and the operator must the respective cover 12 open yourself. In a further embodiment, the respective cover opens 12 automatically.

He is now able to make there operator actions. These actions may consist in particular of preferably performing settings for register correction for minimizing register errors, in particular when the respective plate cylinder is at a standstill 4 , Preferably, actions to eliminate the register deviations, for example, to make the so-called stretching of the printing plate. The clamping elements in the clamping channel 5 operated so that they are displaced to stretch the pressure plate in the circumferential direction. The displacement of the clamping elements, starting from the center in the direction of the lateral edges, leads to stretching of the pressure plate axially to the plate cylinder 4 , The displacement of the clamping elements both in the axial and in the circumferential direction can be done manually via suitable clamping means.

In this case, the respective printing form is preferably stretched in the circumferential direction and / or in the axial direction (relative to the plate cylinder).

Subsequently, the sheet-fed press can be transferred again to the production printing. This is done so that the synchronous tracking of the drives M of the plate cylinder 4 is restored to the main drive. The sheet-fed printing machine is brought to the production speed and the pressure is applied.

During the printing process, the access to the clamping channel is available 5 through a cover 12 in the housing of the printing unit 1 . 2 . 3 closed.

During the print run proof prints are taken at fixed intervals or the quality of the printout is monitored by an image inspection camera. If register deviations show up during the print run, they can now be eliminated according to the method described above.

After processing a print job, the clamping elements are returned to their original position. This is done so that the printing units 1 . 2 . 3 be stopped so that the clamping channel 5 of the plate cylinder 4 comes to a standstill in a range accessible to the operator rotation angle range and there the operator can perform the required operator actions.

2nd embodiment

The inventive method is also applicable to sheet-fed presses, in which the plate cylinder 4 be driven during the printing of the main drive of the sheet-fed press and outside the Fortdrucks of an auxiliary drive.

The method is realized as follows: When a register deviation is detected in the print image, the plate cylinders become 4 in which such an event has been detected, decoupled from the main drive and coupled to the associated auxiliary drive.

With the help of the auxiliary drives, the respective printing units 1 . 2 . 3 now stopped so that the plate cylinder 4 the relevant printing units 1 . 2 . 3 be placed in a position in which the clamping channels 5 in that for the operator accessible rotation angle range are located. The in the span channels 5 arranged clamping elements are actuated by the operator in the manner described above. If the causes of register deviation are eliminated, the sheet-fed press can be transferred again to the production run. For this purpose, the plate cylinder 4 again off the auxiliary drive and coupled to the main drive.

3rd embodiment

The inventive method is also applicable to conventional sheet-fed presses. These are to be understood as those sheet-fed presses in which the plate cylinders 4 be driven during the printing and also to perform auxiliary operations from the main drive of the sheet-fed press.

The method is realized, for example, as follows: When a register deviation is detected in the print image, the sheet-fed press is stopped. This is done so that at least one of the printing units 1 . 2 . 3 in which a register deviation was detected in the print image, the plate cylinder 4 so comes to a standstill that its span channel 5 and / or clamping channel 13 of the rubber cylinder 8th is located in a range accessible to the operator rotation angle. The cover 12 opens and the operator can perform the required operations.

Several plate cylinders 4 are selected and communicated to the controller. From these selected plate cylinders 4 or printing units 1 . 2 . 3 First, the last, based on the sheet travel direction, selected plate cylinder 4 positioned, ie the plate cylinder 4 , which is closest to the sheet delivery. This preferably comes to a standstill in the angular range accessible to the operator.

It can cover itself 12 all selected plate cylinders 4 before or after positioning the plate cylinder 4 , preferably automatically open at the same time.

Sheet-fed presses are designed so that usually at two or more printing units, the plate cylinder 4 (In particular alternately in pairs) have a matching rotational angle position, also referred to as phase position. In other words, there are usually at least two plate cylinders 4 or rubber cylinder 8th , whose tensioning channel 5 at standstill of the sheet-fed press have the same angular position. In the figure this applies to the printing works 1 and 3 to. Therefore, with both, the cover 12 open, so that if necessary at both printing units, the operator actions can be made.

Upon completion of the work, a completion message is sent to the controller by the operator. Preferably, this is done so that closing the cover 12 this enforcement message represents. The execution report can also be done in the form of pressing a button.

After completing the report, the control asks if there are any more printing units 1 . 2 . 3 are present, where an operator action is required and in which the clamping channel 5 . 13 not yet accessible for operator actions.

If this is not the case, the sheet-fed press can be transferred again to the production run.

In the case, if even more identified printing units 1 . 2 . 3 were detected, where an operator action is required and in which the clamping channel 5 was not yet accessible to operator actions, the sheet-fed press is transferred to another position or in a further phase position. Also in this additional position is the clamping channel 5 in a range of rotation angles accessible to the operator. After the operations, the last selected plate cylinder becomes 4 upstream plate cylinder 4 positioned in the range of rotation angle accessible to the operator. After the required work has been carried out, a completion message is generated again. Should still other affected printing units 1 . 2 . 3 be recognized, the mode is repeated until no further action is required.

Preference is given to at least one, in particular a preselected machining cylinder 4 . 8th or more, especially all machining cylinders 4 . 8th due to a triggering of a halt signal (due to a sequence stored in a controller). In particular, all plate cylinders 4 all printing works 1 . 2 . 3 at standstill of the sheet-guiding cylinder 9 and / or drums 10 positioned simultaneously in the area accessible to the operator. In particular, the aforementioned sequences or parts of the sequences are executed by triggering a halt signal from a controller.

This stop signal causes at least a standstill of the bow-transporting cylinder. Preferably, as a result of this stop signal before the standstill of the sheet-guiding cylinder 9 and / or drums 10 at least the bow of in the sheet transport direction 11 seen, first impression cylinder 9 removed to a sheet delivery. Preferably, no arch held by grippers is located at least from the first impression cylinder 9 up to a sheet boom in the printing press, especially at standstill sheet-guiding cylinder (eg impression cylinder) 9 and / or drums (eg transfer drum) 10 as a result of triggering a stop signal.

Preferably, all of the plate cylinders (all stored in the control) are stop signals (except emergency stop), in particular with stop signals connected in program sequences 4 the sheetfed press stopped in the range accessible to the operator rotation angle range.

In particular, the cover may be 12 before stopping, especially at standstill of the machining cylinder 4 . 8th automatically open in the operator accessible rotation angle range as a result of the control.

The signals can be triggered by aggregates or by the control console of the press.

LIST OF REFERENCE NUMBERS

1

 printing unit

2

 printing unit

3

 printing unit

4

 plate cylinder

5

 chip channel

6

 inking

7

 dampening

8th

 rubber cylinder

9

 Impression cylinder

10

 Transfer drum

11

 Sheet transport direction

12

 cover

13

 chip channel

M

 drive

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007057455 A1 [0004]
• EP 0534214 A1 [0006]
• DE 69022378 T2 [0007]
• DE 19531024 A1 [0007]
• DE 102007049453 A1 [0007]
• DE 102004039536 A1 [0007]
• DE 102012014806 A1 [0007]
• DE 4223583 A1 [0007]

Claims (29)

Method for operating a sheet-fed printing machine with multiple printing units ( 1 . 2 . 3 ), whereby - the respective printing unit ( 1 . 2 . 3 ) at least one plate cylinder ( 4 ), - on the plate cylinder ( 4 ) a printing form is clamped and - the plate cylinder ( 4 ) for this purpose suitable for clamping the printing forme, in a clamping channel ( 5 ) arranged clamping elements, - for the plate cylinder ( 4 ) accessible to the operator rotation angle range of the clamping channel ( 5 ) is deposited in a control of the sheet-fed printing machine or - this is calculated on the basis of information stored there and - the printing unit ( 1 . 2 . 3 ) is stopped so that the clamping channel ( 5 ) of the plate cylinder ( 4 ) comes to a standstill in this rotation angle range, characterized in that - setting of the printing form for register correction of at least one printing unit ( 1 . 2 . 3 ) of the several printing units ( 1 . 2 . 3 ) is performed at standstill. A method according to claim 1, characterized in that an expansion of the printing form in the circumferential direction and / or the axial direction is carried out for register correction. Method according to claim 1, characterized in that all the plate cylinders ( 4 ) of the printing units ( 1 . 2 . 3 ) in the range of rotation angles accessible to the operator as a result of triggering a stop signal, at least for arc-guiding cylinders ( 9 ) and / or drums ( 10 ) are stopped by the controller and that all the plate cylinders ( 4 ) of all printing works ( 1 . 2 . 3 ) in the area accessible to the operator when the sheet-guiding cylinders ( 09 ) and / or drums ( 10 ) are positioned simultaneously. A method according to claim 3, characterized in that after the triggering of the stop signal, at least all the sheets from the sheet-guiding cylinders ( 9 ) and / or drums ( 10 ) and then all the plate cylinders ( 4 ) are stopped in the range of rotation angles accessible to the operator. Method according to claim 1, characterized in that between the printing units ( 1 . 2 . 3 ) is provided at least one means for turning the sheet. A method according to claim 1, characterized in that during the printing process access to the clamping channel ( 5 ) through a cover ( 12 ) in the housing of the printing unit ( 1 . 2 . 3 ) is closed. Method according to claim 6, characterized in that the cover ( 12 ) opens automatically. Method according to claim 6 or 7, characterized in that the cover ( 12 ) opens when the clamping channel ( 5 ) comes to a standstill in the intended rotation angle range. A method according to claim 1, characterized in that - the respective printing unit ( 1 . 2 . 3 ) a plate cylinder ( 4 ), which is associated with its own, a main drive of the sheet-fed printing machine synchronously trackable drive (M), wherein - the printing unit ( 1 . 2 . 3 ) is stopped so that in a first step, the synchronous tracking of the plate cylinder ( 4 ) and - in a second step, the plate cylinder ( 4 ) is brought to a stop in the range of angles of rotation accessible to the operator, - the required settings for register correction in the clamping channel ( 5 ,) and - then the synchronous tracking is restored. A method according to claim 1, characterized in that - the respective printing unit ( 1 . 2 . 3 ) a plate cylinder ( 4 ), which is driven in a first mode of operation of the main drive of the sheet-fed press and in a second mode of operation by an auxiliary drive, wherein - the respective printing unit ( 1 . 2 . 3 ) is stopped so that plate cylinder ( 4 ) decoupled from the main drive and to the auxiliary drive of the plate cylinder ( 4 ) is coupled and - the auxiliary drive the plate cylinder ( 4 ) spends in a position in which the clamping channel ( 5 ) in the range of rotation angles accessible to the operator, - the required settings for register correction in the clamping channel ( 5 ), - then the plate cylinder ( 4 ) is decoupled from the auxiliary drive and - is coupled to the main drive. A method according to claim 1, 9 or 10, characterized in that the sheet-fed printing machine at least four printing units ( 1 . 2 . 3 ), and that the sheet-fed press is stopped so that the clamping channels ( 5 ) of all plate cylinders ( 4 ) of the printing units ( 1 . 2 . 3 ) are simultaneously in the range of rotation angles available to the operator. Method according to claim 1, characterized in that - the plate cylinders ( 4 ) are continuously driven by the main drive of the sheet-fed printing machine and - the sheet-fed printing machine is stopped in a position in which the clamping channel ( 5 ,) at least one plate cylinder ( 4 ) in the range of rotation angles accessible to the operator, - the required settings for register correction in the clamping channel ( 5 ). A method according to claim 1, 2, 9, 10, 11 or 12, characterized in that after the setting of the registration correction a completion message is transmitted to the controller. A method according to claim 13, characterized in that the closing of the cover ( 12 ) is transmitted to the controller after setting the register correction as a completion message. A method according to claim 13, characterized in that the enforcement message takes place in the form of pressing a button. A method according to claim 13 or 14, characterized in that is queried by the controller after successful completion of the report, if even more printing units ( 1 . 2 . 3 ) are required, where a setting for register correction is required and in which the clamping channel ( 5 ) was not yet accessible for registry correction settings. A method according to claim 16, characterized in that, if no further such settings for register correction is detected, the sheet-fed press is approached. Method according to claim 16, characterized in that if at least one further such printing unit ( 1 . 2 . 3 ) is detected, the sheet-fed press in the accessible to the operator rotation angle range of the chip channel ( 5 ) of another printing unit ( 1 . 2 . 3 ), the required settings for register correction in the span channel ( 5 ) and a completion message is transmitted to the controller. Method according to at least one of the preceding claims, characterized in that the product produced on the sheet-fed printing machine is subjected to a quality control and, if at least one quality criterion is not met, the printing unit causing the deviation ( 1 . 2 . 3 ) and the relevant printing unit ( 1 . 2 . 3 ) is stopped so that the clamping channel ( 5 ) of the plate cylinder ( 4 ) of the relevant printing unit ( 1 . 2 . 3 ) is in the range of rotation angles accessible to the operator. A method according to claim 19, characterized in that the identified printing unit ( 1 . 2 . 3 ) is signaled. A method according to claim 19, characterized in that during the execution of a print job, a check of the register takes place. A method according to claim 21, characterized in that the register deviation is determined visually on the basis of a test sheet taken during the continuous printing. A method according to claim 21, characterized in that the register deviation is determined by sheet inspection during the continuous printing. Method according to claim 21, 22 or 23, characterized in that, in order to eliminate the register deviation, the clamping elements for expanding the printing plate in the circumferential direction of the plate cylinder ( 4 ) are relocated. A method according to claim 21, 22 or 23, characterized in that to eliminate the register deviation for stretching the printing form, the clamping elements axially to the plate cylinder ( 4 ) are displaced in the direction of the lateral edges of the printing form. A method according to claim 21, 22 or 23, characterized in that the clamping elements in the clamping channel ( 5 ) are displaced manually via suitable clamping means. Method according to the preceding claims, characterized in that the required settings for register correction in the clamping channel ( 5 ) in preparation for a job to be carried out on the sheet-fed press. Method according to the preceding claims, characterized in that the required settings for register correction in the clamping channel ( 5 ) in the course of interruptions in the execution of an order to be carried out on sheet-fed press order. Method according to the preceding claims, characterized in that after the execution of an order, the clamping elements are returned to their original position, such that the at least one printing unit ( 1 . 2 . 3 ) is stopped so that the clamping channel ( 5 ) of the plate cylinder ( 4 ) comes to a stop accessible to the operator rotation angle range and there the Operator can make the necessary settings for register correction.

Images