JP2000355097A - Registering correcting device for multicolor sheet-fed press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the simple and easy correcting operation of a plate cocking by a method wherein this device has a function for substituting the correcting information of the twisting adjustment of the operational control for commanding the actuation to a registering correction including the correction of a printing plate towards its plate point for an other registering correcting operation, which includes no registering correction towards its plate point. SOLUTION: In order to perform a twisting adjustment, the adjustment toward either one of the driving side of a printing machine is necessary or the distinction between a plate point direction and a plate tail end direction is necessary. For the distinction, a button and a displaying part are provided. In a plate cocking system, after the registering correcting value toward the plate point, which is actually impossible, is inputted, a registering correcting execution button is depressed, so as to send all the correcting information to an operational controlling means. The fundamental roll of the operational controlling means is to perform numerical calculations, signal conversions or the like on the basis of a correcting information sent from an inputting means 9 so as to substitute the correcting information on the twisting adjustment for an other registering correcting operation, which includes no registering correction towards its plate point. Thus, an intuitive inputting operation can be realized, an operationally convenient plate cocking can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-color sheet-fed printing press, and more particularly, to a register correcting device for the same.

[0002]

2. Description of the Related Art In a multicolor sheet-fed printing press, a printing plate is wound around a plate cylinder of a printing unit for each color, and overprinting is sequentially performed. At this time, good printing quality cannot be obtained unless the respective colors are overprinted at the correct position on one sheet.

In order to obtain a correct register for each color, a cross-shaped register mark commonly called a register mark is printed on a margin of a sheet. Then, the amount of misregistration of the register mark for each color is measured to determine the desired amount of register correction, and register correction is performed in the vertical / horizontal direction and twist adjustment.

[0004]

2. Description of the Related Art Register correction in the up-down direction / left-right direction is performed by advancing the rotational phase of a plate cylinder and moving it left and right, and has already been technically established as disclosed in, for example, JP-A-63-91253. Have been. In addition, the register correcting device for twist adjustment includes a plate cylinder cocking method in which the plate cylinder itself is twisted, and a plate tip of a printing plate wound around the plate cylinder being slightly moved so that the blanket cylinder facing the blanket cylinder can be adjusted. There is a plate cocking method in which the sheet is spread in the direction of the bottom of the plate under contact pressure. Of these, the plate cylinder cocking method has the problem that the printing machine is easily overwhelmed.In recent years, the focus has been on development of a plate cocking method that can provide a large amount of register correction and has a relatively simple structure. For example, Japanese Patent Application Laid-Open
There is a twist adjusting device disclosed in Japanese Patent No. 77398.

[0005]

Despite the great advantages described above, the plate cocking method inherently spreads the printing plate from the plate tip to the plate bottom, so that the twist adjustment is performed in the plate bottom direction. There is a restriction that you can only do it.
However, there are various correction modes required in the actual register correction work, and there is a case where correction in the direction of the printing plate end is desired. In such a case, it is difficult and time-consuming for the operator to make a determination and work for realizing a desired register correction operation while avoiding the twist adjustment in the plate tip direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an advanced register correcting apparatus, which aims to make the correcting operation in plate cocking simple and easy and to improve the function in plate cocking. It is to realize an intuitive and free correction operation as if there were no restriction.

[0007]

According to the present invention, there is provided a register correcting device according to the present invention, wherein an arithmetic control unit (25) for sending an operation command signal to a register correcting unit (8) is provided with correction information on twist adjustment. When register registration in the printing plate direction is included, a function of replacing the correction information with another register correction operation that does not include registration in the plate direction is included.

[0008]

The operator may input the amount of register correction to the input means (9) as it is, even if the twist adjustment includes register correction in the direction of the printing plate. Arithmetic control means (25)
Determines the correction information from the input means (9), and includes register correction in the printing direction that is impossible in practice, for example, as a combination of top-down direction correction and twist adjustment in the plate edge direction. The replacement operation is performed, and the register correcting means (8) is operated. As a result, it is possible to realize register correction equivalent to a case where a twist adjustment is performed in the printing plate direction.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a schematic explanatory view of a multicolor sheet-fed printing press provided with a register correcting device according to the present invention, FIG. 2 is a plan view of input means of the device, FIG. 3 is an operation flowchart of the device, and FIGS. FIGS. 4A and 4B are explanatory diagrams of a pattern of a register correction operation.

In FIG. 1, reference numeral (1) denotes a paper feed unit on which sheets to be printed are piled, and (2) denotes a paper discharge unit from which printed sheets are taken out. The sheet is transported through four printing units (3) in this case,
Each color is sequentially overprinted.

Each printing unit (3) comprises a plate cylinder (4), a blanket cylinder (5), and an impression cylinder (6) each having a printing plate wound thereon, and these are connected by an intermediate transport cylinder (7). ing.

The plate cylinder (4) on which the printing plate is wound is, as is well known from the above-mentioned publications and the like, the plate cylinder (4).
While adjusting the position of itself in the vertical direction (the direction of movement of the sheet) / left and right direction (the direction perpendicular to the direction of movement),
There is a register correcting means (typically represented by a block indicated by reference numeral (8)) for adjusting the twist of the printing plate by the plate cocking method.

Reference numeral (9) denotes an input means as a control console, and as shown in plan view in FIG.
There is a section (10) for inputting a desired register correction amount in the left-right direction with a button, and a section (11) for inputting a desired register correction amount for the twist adjustment with a button. Of these, the input of the correction amount in the up-down direction is performed by the buttons (12) and (1) with the up-down arrow for each increase or decrease.
3) by pressing until the desired value appears on the display (14). Similarly, in the left-right direction, the buttons (15) and (16) with left and right arrows may be pressed while looking at the display unit (17).

As for the twist adjustment, it is necessary to consider whether the adjustment is performed on the driving side (for example, the left side in the traveling direction) or the operation side (the same side on the right side) of the printing press. We have to distinguish between adjustment to the direction and the direction of the plate edge. Therefore, the four buttons (18), (19), (20), (21) and 2
Display units (22) and (23) are provided. What is important here is that in the apparatus of the present invention, the register correction value in the printing direction, which is not actually possible depending on the plate cocking method, may be directly input. In this case, a negative value is displayed on the display units (22) and (23). After all the register correction information is input, the register correction execution button (24) is pressed,
All the correction information is sent to the arithmetic and control unit (25).

The basic role of the arithmetic control means (25) is as follows.
The operation command signal is transmitted to the register correcting means (8) based on the correction information from the input means (9), and various operations such as numerical calculation and signal conversion are performed. However, the arithmetic control means (25) of the apparatus of the present invention is not limited to this. If the correction information relating to the twist adjustment received from the input means (9) includes the register correction toward the plate edge of the printing plate (this As described above, such register correction cannot be performed in the plate cocking method.) There is a function of replacing this correction information with another register correction operation that does not include a correction operation in the direction of the printing plate end. are doing.

Since such a replacement operation can be classified into several types of patterns, the replacement operation will be described with reference to FIG. First, 4-A on the left side of FIG.
As shown in (1), when the mark (shown as a right-angled cross mark) indicating the amount of deviation related to twist adjustment is shifted only on one side of the sheet with respect to the correct position of the register mark on the sheet (literally shown as a cross). (In other words, when the twist registration is deviated only on one of the drive side and the operation side of the printing press), the top-bottom correction is performed for the desired correction amount that is the same as the deviation amount (4- B). Next, the other side of the sheet (in other words, 4
If the shift of -A is on the operation side, then the same amount as the desired correction amount for the drive side) is adjusted by twisting in the plate edge direction (4-C). Thereby, as shown in 4-D, the correct registration is obtained. In other words, in this case, if the twist adjustment in the plate tip direction is possible in the plate cocking method, it is possible to immediately shift from the state of 4-A to the correct register of 4-D, but it is not actually possible. Therefore, by combining the top-bottom correction in the direction of the printing plate and the twist adjustment in the direction of the printing plate, a replacement operation equivalent to a twist adjustment in the direction of the printing plate is performed by the arithmetic control means (25).
Is being done.

Next, as shown at 5-A on the left side of FIG. 5, when twist adjustment is required in the sheet tip direction on both the sheet operating side and the driving side, the desired correction amount is increased on the side (5-A). B performs the vertical correction for the same amount as the operation side. Then, for the difference between the desired correction amount on the operation side and the desired correction amount on the operation side, the twist is adjusted in the direction of the edge of the printing plate as shown in FIG.
You get

Further, as shown at 6-A on the left side of FIG.
In the case where the twist adjustment toward the plate tip (in this case, the operation side on the right side of 6-A) and the twist adjustment toward the edge of the plate (the left side drive side of 6-A) are simultaneously requested, The same amount as the desired correction amount in the printing direction is corrected in the vertical direction in the printing direction (6-
B) Then, on the opposite side (drive side), the total amount of the correction amount in the original printing direction and the correction amount in the printing direction is adjusted by twisting in the printing direction (6-C), and the correct register is obtained. (6-
D).

When only the one side of the sheet needs to be adjusted in the direction of the edge of the plate, as indicated by 7-A on the left side of FIG. 7, the twist can be adjusted in the direction of the edge of the plate. -B). In addition, as shown by 8-A on the left side of FIG. 8, when the twist adjustment is performed in both directions on the operation side and the drive side in the direction of the edge of the printing plate, the vertical correction is performed in the direction of the edge of the printing plate for the small amount of the desired correction. -B), by adjusting the difference between the two correction amounts by twisting the side having the larger desired correction amount in the direction of the edge of the plate (8-
C), correct registration can be obtained (8-D).

Finally, returning to FIG. 3, the operation flow of the apparatus of the present invention is summarized. The operator measures the register mark (stage 101 (S-101)), and adjusts the vertical / horizontal direction and the desired twist adjustment. The register correction amount is directly input to the input means (9) (Stage 102 (S-10
2)).

The arithmetic control means (25) determines whether or not the correction information relating to the twist adjustment includes a register correction in the printing direction (stage 103 (S-103)). Operation is performed (stage 104 (S-
104)). Then, an operation command signal is transmitted (stage 1).
05 (S-105)), the register correction correcting means (8) is operated based on this (stage 106 (S-105)).
-106)).

[0022]

According to the apparatus of the present invention, it is possible to adjust the twist in the printing direction which is impossible by the plate cocking method.
Since it is realized through another register correction operation by the replacement function of the arithmetic control means, the operator can simply intuitively input and operate. Therefore, the apparatus of the present invention has an important significance in that the plate cocking technique is close to completion in terms of usability.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a multicolor sheet-fed printing press provided with a register correcting device according to the present invention.

FIG. 2 is a plan view of an input unit of the device.

FIG. 3 is an operation flowchart of the apparatus.

FIG. 4 is an explanatory diagram of a pattern for twist adjustment, in which one side of a sheet is twist-adjusted in a plate tip direction.

FIG. 5 is an explanatory diagram of a pattern in a case where both sides of a sheet are twist-adjusted in a plate tip direction.

FIG. 6 is an explanatory diagram of a pattern in a case where a twist adjustment in a plate tip direction and a plate tail direction are mixed.

FIG. 7 is an explanatory diagram of a pattern when only one side of a sheet is twist-adjusted in the direction of the plate edge.

FIG. 8 is an explanatory diagram of a pattern in a case where a twist adjustment is performed on both sides of a sheet in the direction of a plate edge.

[Explanation of symbols]

 Reference Signs List 3 printing unit 4 plate cylinder 8 register correction means 9 input means 25 arithmetic control means

Claims (1)

[Claims] 1. A register correcting means (8) for adjusting the position of a plate cylinder (4) in the vertical / horizontal direction and adjusting the twist of a printing plate, and adjusting a desired register correction amount to a vertical / horizontal direction and a twist adjustment. Input means (9) for inputting for each of
A multi-color sheet-fed printing press comprising: an arithmetic control unit (25) for sending an operation command signal to the register correcting unit (8) based on the correction information from the input unit (9). Has a function of replacing the correction information with another register correction operation that does not include the register correction to the printing plate when the correction information related to the twist adjustment includes the register correction in the printing plate direction. Register correcting device characterized by the above-mentioned.