DE19511686A1 - Printing plate change procedure - Google Patents

Abstract

The plate cylinder of any one printing unit is first twisted into a plate release setting. This allows the plate to be removed from the circumference of the cylinder as the cylinder turns in its uncoiling direction. Each plate (1-8) is removed from its cylinder as these turn together in the uncoiling sense until the last plate has been removed. The plate cylinder of the first unit is turned into its plate-clamping position to admit the fresh plate (11) as all cylinders turn in the coiling-up direction. New plates (11-18) are installed in each adjoining cylinder as the cylinders turn into the clamping setting as indicated. A signal is emitted automatically or by hand when a plate (11-17) has been successfully clamped so as to turn the respective cylinder into its clamping position. The cylinders turn into their release settings in parallel to one another.

Description

The invention relates to a method for changing Printing plates on plate cylinders from one behind the other arranged printing units of a rotary printing press are attached, the cylinders of the printing units synchronously are drivable.

To change printing plates quickly in rotary printing presses To be able to carry out the development went in the last Years in the printing press area that automatically working devices were created that a Operator on the press should be made redundant.

EP 0 435 413 A2 is one Printing plate changing process known in which the used Printing plates fully automatically from the respective Plate cylinders are discharged and the following new printing plates are fed to the plate cylinders. The Removing the printing plates from the, or feeding the Printing plates to the plate cylinders are made by one certain machine angle offset simultaneously.

However, it has been found that it is particularly in automatic plate loading can cause problems such as B. register problems, clamping problems, clamping problems, Winding problems, etc. It is therefore necessary that the responsible operator, e.g. B. the printer Pressure plate feed personally monitored on site and intervening, if necessary. Here it is in the Usually necessary that sometimes half in the press inserted pressure plate by turning the respective backwards Plate cylinders run out of the printing machine again must become.  

It is in the process according to EP 0 435 413 A2 Disadvantage that the synchronous to the respective Other pressure plates introduced at one Misfeed of a printing plate at the same time as the relevant printing plate again from the respective Printing units must be brought out. This can cause it to other plate feeding problems also on the neighboring ones Printing units come.

The invention is therefore based on the object of a method to create, on the premise of greatest possible personal surveillance of the Printing plate feed by an operator a quick Printing plate change is guaranteed.

The object is achieved by the characterizing Part of claim 1 solved.

The advantage of the method according to the invention lies especially in that each printing plate is under supervision an operator, e.g. B. the responsible printer who Printing machine can be fed and that at less critical work steps, e.g. B. when leading out Printing plates, fully automatic work steps provided are.

In a further embodiment of the method, it is provided that that the printer is on after successfully clamping the printing plate generates a signal to the printing unit monitored by him by means of of which the printing unit to be loaded next into a Printing plate receiving position is rotated. In this way the time it takes for the printer to finish itself to get to the next printing unit, used to the next plate cylinder of the next printing unit in Rotate printing plate receiving position.  

It is alternatively suggested that after successful Printing plate clamping automatically generates a signal, and the positioning of the plate cylinder of each subsequent printing unit and the printer only at a misfeed interrupts this automatism.

An embodiment for the method according to the invention is described below and is in the form of a Bar chart shown in the figure.

In the figure, a bar chart is shown, which qualitatively the temporal consequence of a printing plate change a rotary printing machine with z. B. eight printing units and the corresponding eight plate cylinders shows.

With 1 , the printing plate of the first printing unit is designated, the z. B. 0-machine degree in an "unclamping position" for the rear edge of the printing plate 1 . During a forward rotation - clockwise - of the plate cylinder of the first printing unit, the printing plate 1 is unwound from the circumference of the first plate cylinder and transferred to an intended device for receiving the printing plate 1 . After an approximately 120 ° rotation of the first plate cylinder, a plate cylinder of the second printing unit comes into a "unclamping position" for the rear edge of a printing plate 2 arranged on the plate cylinder.

After loosening the rear edge of the printing plate 2 , it is unwound from its plate cylinder. After a further approximately 120 ° rotation, a plate cylinder of the third printing unit comes into an "unclamping position" for the rear edge of a printing plate 3 . This is also released and unwound by rotating a corresponding plate cylinder.

In an advantageous embodiment of the method, the printing plates 1 , 4 , 7 are simultaneously unclamped, unwound from their plate cylinder and transferred simultaneously to the printing plate holding devices provided in each case. The process steps for unclamping and guiding out the printing plates 2 , 5 , 8 and 3 , 6 each run synchronously in accordance with the process for unclamping the printing plates 1 , 4 , 7 .

In contrast to the simultaneous or simultaneously overlapping unclamping of the printing plates, the new printing plates 11 to 18 are clamped "in series", that is to say one after the other.

After moving to the "clamping position" of the plate cylinder of the first printing unit, the new printing plate 11 is fed to the corresponding plate cylinder and wound, clamped and tensioned on the plate cylinder by rotating it counterclockwise. As soon as the "clamping process" of the printing plate 11 on the plate cylinder of the first printing unit has been successfully completed, an operator, e.g. B. the printer immediately sends a signal to the printing press, e.g. B. by means of a button or switch, so that the printing press rotates based on this signal in a "clamping position" for the new printing plate 12 of the plate cylinder of the second printing unit. This process is repeated until all new printing plates 11 to 18 are attached to their respective plate cylinders. The printer goes from printing unit to printing unit and monitors the clamping process of each individual printing plate. It is provided that the signal for further rotation of the plate cylinder of the subsequent printing unit into the "clamping position" is given manually immediately on the previous printing unit. In an alternative form of the method, it is provided that the signal is generated automatically, but the printer is given an opportunity to intervene.

Reference list

1 pressure plate
2 pressure plate
3 pressure plate
4 pressure plate
5 pressure plate
6 pressure plate
7 pressure plate
8 pressure plate
11 pressure plate (new)
12 pressure plate (new)
13 pressure plate (new)
14 pressure plate (new)
15 pressure plate (new)
16 pressure plate (new)
17 pressure plate (new)
18 pressure plate (new)

Claims (5)

1. A method for changing printing plates which are mounted on plate cylinders of printing units of a rotary printing press arranged one behind the other, the cylinders of the printing units being drivable synchronously, characterized in that
that the plate cylinder of any printing unit is rotated into a "printing plate unclamping position" and that the printing plate ( 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ) is removed from the circumference of the plate cylinder during the rotation of the plate cylinder,
that each printing plate ( 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ) of the further printing units is removed from their respective plate cylinder when their respective "printing plate unclamping position" is reached during the simultaneous rotation of all plate cylinders in the unwinding direction,
that after removal of the last printing plate ( 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ) from the plate cylinders of the rotary printing machine, the plate cylinder of the first printing unit is rotated into "printing plate clamping position" and that a new printing plate ( 11 ) during the rotation all plate cylinders are applied in the winding direction to the plate cylinder of the first printing unit, that after the "printing plate clamping process" the plate cylinder of the adjacent printing unit is rotated into the "printing plate clamping position" and that a new printing plate ( 11 ; 12 ; 13 ; 14 ; 15 ; 16 ; 17 ; 18 ) is applied to this plate cylinder during the rotation of all plate cylinders in the winding direction. 2. The method according to claim 2, characterized in that after successful completion of the printing plate clamping process one of the printing plates ( 11 to 17 ) a signal is generated by which the plate cylinder of the adjacent printing unit is rotated into the "printing plate clamping position". 3. The method according to claim 2, characterized, that the signal is generated automatically. 4. The method according to claim 2, characterized, that the signal is generated manually. 5. The method according to any one of the preceding claims, characterized in that the unclamping process of the printing plates ( 1 , 4 , 7 ; 2 , 5 , 8 ; 3 , 6 ) takes place parallel to one another.