JPH04226366A - Manufacture of print sample of indivisual color or combined color - Google Patents

Abstract

PURPOSE: To extract color automatically by performing insertion/removal of a cylinder for individual print unit of a printing press according to a stored programming step. CONSTITUTION: A controller 12 is provided at the time of producing a print sample of individual colors or combination of colors in a printing press, and at least one control program is stored therein. The control program is configured of individual programming steps and insertion/removal of a cylinder for individual print unit 2 of the printing press 1 is performed according to the stored programming step.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing individual color or color combination swatches in a printing press.

0002

[Prior Art] West German Patent Publication No. 153644
No. 9 discloses a control device for a rotary offset printing press for multicolored sheets. Therein, a selected blanket cylinder or any combination of blanket cylinders of a printing unit is adjustable from the main operating position in the position of the printing end or in the position of the non-printing end. This allows printed samples of any color or combination of colors to be produced without great expense.

[0003] What is considered to be a drawback of this control system is that the operator must manually insert or remove the shell. The number of print swatches produced with a selected color or color combination cannot be precisely determined. This means that there is a risk that too many sheets will be printed in a selected color or combination of colors and that these will eventually become printed waste paper.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to describe a method for automatically extracting colors.

[0005]

SUMMARY OF THE INVENTION According to the invention, a control device is provided, in which at least one control program can be stored, the control program being constructed from individual programming steps. This problem has been achieved in that the loading and unloading in the individual printing units of the printing press are carried out in accordance with stored programming steps.

[0006]

An advantageous development of the method according to the invention provides that the control program is selected from a programming library. In this programming library, predetermined control programs are stored, for example depending on the number of colors to be printed, which control programs automatically generate all print samples necessary for judging a printed product. being considered. This means that the type of color extraction and the number of prints to be produced are automatically taken into account.

[0007] In parallel with this configuration, a control program includes:
It can be constructed from freely programmable program steps. This measure enables the operating personnel to produce special printed specimens corresponding to the desired requirements.

[0008] In another more advantageous configuration of the present invention,
For each individual programming step, the number of prints to be made in the printing unit of the corresponding printing press is determined.
It is possible to make a selection in advance. By preselecting the sheets to be printed during the programming step in this way, it is possible to produce as many print samples of one color or color combination as are necessary for the evaluation of the print samples. It becomes like this. This means that not only cost savings but also time savings can be achieved.

A further development of the method according to the invention provides that after the execution of the program steps, ie after the printing of a preselected number of sheets in one color or color combination, the separating strip is removed. Automatic insertion into the storage pile is proposed. The operator can easily visually observe when a print sample of a single color or a combination of colors is completed or when the next operation is started.

In accordance with a further development of the method according to the invention, it is proposed to preset the printing speed of the printing press. This measure makes it possible to achieve a printing result that is optimally adapted to the actual printing process carried out at a later point in time.

According to a further development of the invention, it is proposed to automatically clean the rubber blankets of blanket cylinders that have not yet been rolled in before, after or during a programmed run.

[0012] In an advantageous development of the method according to the invention, the waste printing sheets are pre-stacked for proofing, the number of printing waste sheets is transmitted to the control device, and the printing waste sheets are stacked after the printing waste sheets have been processed. It has been proposed to start the actual control program for the first time. In this case, too, it has been found to be advantageous to be able to separate the print waste sheets from the good sheets by automatic strip insertion. Furthermore, it is proposed to take into account a preselected number of printed waste sheets between two programming steps.

A further advantageous measure is that good sheets are automatically separated when printing samples of one color or a combination of colors are produced, so that the operator can without any additional effort,
It becomes possible to judge each print sample.

Furthermore, it is provided to take into account the number of printed waste sheets printed between two programming steps. This ensures that the judgment of each print sample is made on the good sheet and not in the forward running phase.

In order to be able to achieve a stable printing condition as quickly as possible after changing the printing sample, the printing should be additionally rolled up before carrying out the next programming step. It has been proposed to ink the printing plate of the unit and thoroughly moisten it.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail with reference to a few drawings.

FIG. 1 shows a sheet-fed printing press 1 with two printing units 2 , a feeder 3 and a delivery 4 . The individual printing unit 2 itself shows a conventional cylinder arrangement consisting of a form cylinder 5, a blanket cylinder 6, an impression cylinder 7 and a transfer cylinder 8. A reversing drum 9 is arranged between both printing units 2. An angle signal transmitter 11 is attached to the shaft of the paper feed cylinder 10 with registration device. The information emitted by the angle signal transmitter 11 over the respective angular position of the printing press 1 is transmitted via data lines to a control device 12 mounted, for example, in a switchboard. A control panel 13 is used as a barrier between the machine and humans, on which a plasma display 14 and a keyboard 15 are provided for inputting and outputting data. The operator can call up the programmed control program from this control panel 13. Corresponding to the programming steps stored in this program, individual print samples of various colors and combinations of colors can be produced in the printing press 1.

In the two-color sheet printing machine shown in FIG. 1, it is possible to produce a predetermined number of sheets in individual colors as well as in simultaneous printing of two colors. The sound loading and unrolling of the impression cylinder 7 on the blanket cylinder 6, the insertion of the separating strip into the sheet pile and the unrolling of the sheet-fed unit after the program has been executed are performed by the corresponding printing press 1. This is done via adjustment devices 16, 17, 18 located at positions . In order to further optimize the production of print samples, a rubber blanket cleaning device is activated automatically before, during and after the execution of the individual programming steps.

Furthermore, before carrying out the next programming step, the printing plate of the newly inserted printing unit is inked via a dampening device 19 and an inking device 20;
The possibility also exists that it can be sufficiently moistened.

[Brief explanation of the drawing]

1 is a schematic side view of a two-color sheet-fed printing press with a control device connected to carry out the method of the invention; FIG.

2 is a schematic side view of a two-color sheet-fed printing press with a control device connected to carry out the method of the invention; FIG.

[Explanation of symbols]

1 Sheet-fed printing press 2 Printing unit 3 Feeder 4 Delivery 5 Plate cylinder 6 Blanket cylinder 7 Impression cylinder 8 Transfer cylinder 9 Reversing drum 10 Feed drum with registration device 11
Angle signal transmitter 12 Control device 13 Control panel 14 Display 15 Keyboard 16, 17, 18 Adjustment device 19 Dampening device 20 Inking device

Claims (12)

[Claims] 1. A method for producing print samples of individual colors or combinations of colors in a printing press, comprising: a control device (12), in which at least one control device is provided; The program is memorizable and −
This control program is then built up from individual programming steps, and the loading and unrolling in the individual printing units (2) of the printing press (1) correspond to the stored programming steps. A method for producing printed samples of individual colors or combinations of colors in a printing press, characterized in that the method is carried out in a printing press. 2. A method according to claim 1, characterized in that the control program is selected from a programming library. 3. Method according to claim 1, characterized in that the control program is constructed from freely programmable programming steps. 4. According to claim 3, characterized in that the number of prints to be carried out for each programming step is preselectable in the printing unit (2) of the corresponding printing press (1). Method. 5. characterized in that the separation strip is automatically inserted after the programming step has been carried out,
The method according to claim 4. 6. Method according to claim 4, characterized in that the printing speed of the printing press (1) is predetermined. 7. The step of claim 1, characterized in that before, after or during the programming execution, the rubber blanket is cleaned on the already printed and not yet rolled-in blanket cylinder (6). The method described in any one of paragraphs 6 to 6. 8. If the printing waste sheets are pre-stacked for the proofing and - the printing waste sheets have already been printed, the operation of the control program is started by inputting the number of the respective printing waste sheets. 8. A method according to claim 1, characterized in that: 9. A method as claimed in claim 8, characterized in that the printing waste sheets are separated from the good sheets by automatic insertion of strips. 10. The method according to claim 1, wherein the non-defective sheets are automatically separated one by one. 11. Method according to claim 1, characterized in that the number of printed waste sheets is automatically taken into account and this is printed between two programming steps. 12. The method as claimed in claim 1, further comprising inking the printing plate and overwetting it before carrying out the programming step.