JPS5955751A - Method for aligning picture pattern of offset rotary press - Google Patents

Abstract

PURPOSE:To make it possible to reduce spoilage of papers, by a method wherein a roll is moved aside to a position where a register mark mounted to a plate can be printed and, after a rotary press is operated to align a picture pattern, the roll is returned to a regular position to continuously perform printing. CONSTITUTION:A picture pattern aligning register mark 16 is put in a plate 17 at the outside position from the position of regular paper 8' and bent to be mounted to plate cylinders 12, 13. In the next step, the register mark detector 19 of a cooling part 4 is moved to be adjusted to a position capable of detecting the mark 16 and the support arm 17 of a roll 6 is moved by the central manipulation panel of a waste paper part 5 or the paper 8 is moved by the sensor position of a PEC apparatus 10 to start printing while an automatic picture pattern aligning apparatus is operated. When the alignment is judged by a display device, the paper 8 is returned to a regular position and printed matter having no mark is discharged as a product. By this method, the alignment of the picture pattern is enabled even with respect to printed matter to which the the register mark must not be applied and the number of spoilages can be reduced to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern matching method for an offset rotary printing press, and more particularly, to a pattern matching method for an offset rotary printing press that prints products that cannot include register marks for automatic pattern matching. 1-2 completed.

In recent years, the quality of offset rotary printing presses and printing materials has improved.

Improved performance has made it possible to print high-end printed materials such as catalogs and advertisements on rotary presses, which were previously printed on sheet-fed presses. In addition, the number of newspaper insert advertisements for general products is increasing year by year, and most of these are printed on rotary presses and placed in newspapers delivered to homes as leaflet advertisements without any processing. Therefore, since it is not possible to insert register marks for pattern matching in the margins of flyer advertisements, the operator must look at the pattern and correct any misregistration, which requires a high degree of skill.

If the design of a printed matter changes, the plate must be replaced, but there are errors caused by bending each color plate with a folding machine, errors when it is mounted on the plate cylinder, and the amount of paper elongation between each color due to changes in paper quality. Due to the difference in printing, the amount of pattern deviation in the paper advance direction and width direction becomes large, 1 to 2 mm, at the beginning of printing.

In order to match this pattern deviation, generally about 1500 ~
This would result in 2,000 copies of wasted paper, which would be a huge waste of paper and labor, and K would have to be a skilled worker with many years of experience in order to match the designs in a short time. In these days when there are few skilled workers, it is very difficult to secure talented people and it is a headache for managers.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to quickly match the designs of products in which register marks cannot be removed, without requiring a skilled technician, and with a reduced number of copies of wasted paper. There is a way to provide that.

The pattern matching method for an offset rotary printing press according to the present invention is for printing products in which register marks for automatic pattern matching cannot be placed. Then, move the web to a position where the register mark can be printed, operate the rotary printing press, use the automatic pattern matching device to match the pattern using the register mark, then return the web to its normal position and press the rotary press. This is a pattern matching method for an offset rotary printing press, which is characterized in that pattern matching and product printing are performed continuously without stopping the printing press.

Prior to a detailed description of the method of the present invention, the configuration of a rotary offset printing press will be explained based on FIG. 1. Offset rotary printing presses generally have a paper feed section].

Printing department 2. Drying section 3. It consists of a cooling section 4 and a paper discharge section 5.

In the paper feed section 1, a web 6 is generally supported by an arm 7,
The paper 8 is pulled between a mechanically driven feed roller and a press roller 9, and is fed out with a constant tension applied thereto. A brake (not shown) is applied to the web 6 using electric forward air pressure. The widthwise position of the paper 8 is determined by the state in which the web 6 is attached to the arm 7, but generally the position of the arm 7 can be adjusted electrically or manually for positioning after attachment.

Further, in order to prevent the paper 8 from meandering during operation depending on the paper quality, an automatic adjustment device 10 (abbreviated as EPC) detects the paper edge using a sensor and adjusts the paper 8 so that it always passes through the same position. is the provision.

The paper 8 fed from the paper feed section 1 enters the printing section 2, passes through each unit sequentially from the first unit 11, and prints black paper.

- 5 pages Multi-colored paper printed on both sides at the same time: indigo, red, yellow 8
The ink is sent to the drying section 3, where the ink is dried, and then the ink is sent to the cooling section 4.
After the ink is fixed on the paper to prevent it from becoming dirty, the paper is sent to the paper discharge section 5, where it is cut into a required size, folded, and discharged.

Color printing is performed by transferring four colors of ink onto paper 8 in the printing section 2. In order to transfer these four colors without any deviation, the printing cylinder 12. shown in FIG. 2 is used. It is necessary to be able to adjust the back plate cylinder 13 to the advance direction arrow 4 and the width direction arrow 15 of the paper 8 for each color before and during operation. Printing machines of this type are equipped with manual or electric adjustment means.

Generally, in order to facilitate image matching, a register mark 16 for pattern matching is placed on the plate 17 so that it can be printed on the margin area where the printed product is to be cut, and the plate 17 is folded using a folding machine.
2, 1.3.

Further, an automatic pattern matching device (not shown) having a detector 19 for detecting register marks 16 installed in the cooling unit 4 is provided.
This is provided. The automatic pattern matching device automatically moves the front and back plate cylinders in the traveling direction and the width direction based on the position signal of the register mark 6-16 printed by the front and back plate cylinders of each color from the detector 19. Match the pattern to.

However, if the blank space is not cut and the f-1: product is produced, register marks for pattern matching cannot be placed in the blank space as described above. The method of the present invention is used for pattern matching of such printed matter.

To explain one aspect of the method of the present invention based on the drawings, as shown in FIG. 3, a register mark 16 for pattern matching is placed on the plate 17 at a position 18 shifted outward from the position of the regular paper 8', Fold the front and back plate cylinders 12 with a folding machine as usual.
, 1.3 (see Figure 2).

Next, the register mark 16 installed in the cooling section 4 in FIG.
The detection detector 19 is moved and adjusted to a position where the register mark 16 can be detected. Furthermore, in order to move the paper to the position where the register mark 16 is printed as shown in FIG. Paper 8 is moved by remote control. When printing is started in this state and the automatic pattern matching device is activated in the same manner as described above, the pattern will be automatically matched without the operator having to perform concentrated operation of the paper ejection unit 5 to press the push button on the page board to match the pattern. can do. The automatic pattern matching device has an indicator that lets you know that the patterns match, so you can judge whether the patterns match without looking at the printed material.

If the pattern matches, the paper 8 is moved back from the position 18 to the normal position, and the printed matter without the register mark 16 is discharged as a product. Once the pattern is matched, it rarely goes wrong, but if you occasionally perform a sampling inspection and make fine adjustments by pressing buttons on the central control panel, you can print a sufficient product. In other words, the automatic pattern matching device can be used only when printing a poem, and thereafter it is sufficient to advance the plate cylinder and adjust the width direction by pressing a button without using the automatic device.

As described above, the method of the present invention allows even printed matter in which register marks cannot be placed, to be able to avoid errors in bending the plate, mounting errors on the plate cylinder, differences in the amount of elongation due to changes in paper quality, and variations in the image size due to differences in the indoor environment. Since patterns can be matched using an automatic pattern matching device regardless of the situation, there is no need for skilled workers and the number of copies of wasted paper can be kept below the conventional value of ]/2, which not only saves resources but also ensures a stable Great effects can be obtained by printing quality products.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a general offset rotary printing press, Figure 2
The figure is a perspective view showing the configuration of the printing cylinder, and FIG. 3 is a diagram showing the arrangement of paper relative to the plate in an embodiment of the method of the present invention. 1. Clam paper section, 2. Printing section, 3. Drying section, 4.
...Cooling section, 5...Paper discharge section, 6...Wrap paper, 8...
・Paper, 8'...Paper in normal position, 12...Top cylinder, 1
3...Back plate cylinder, 16...Register mark, 17...
- Plate, 18... Position where paper is shifted, 19... Register mark detector.

Claims (1)

[Claims] Automatic pattern matching In the pattern matching method for rotary offset printing machines that print products that cannot be marked with register marks, register marks can be printed on the web by installing a plate with register marks placed at a position outside the regular paper width position. After aligning the web to the correct position, operating the rotary printing press, and using the automatic pattern matching device to match the patterns using the register marks, the web is returned to its normal position and the patterns are matched without stopping the rotary printing press. A pattern matching method for an offset rotary printing press that is characterized by continuous printing of products.