JPS62124951A - Multi-color rotary printing - Google Patents

Abstract

PURPOSE:To adjust a deviation in the web direction of a pattern from the second unit by printing a pattern in the first unit, using a guideline to be printed at the same time and detecting a distance between the guideline and the pattern with a sensor. CONSTITUTION:A pattern C and a guideline B are printed on a web A in the first unit of a multi-color rotary printer. A distance X between the guideline B and the pattern C is fixed. Using the distance X between the guideline B and the pattern C in the first unit 10 as a reference, a distance between a pattern to be printed after the second unit 20 and the guideline B is scanned by a sensor 24, 34. Then a difference between the distance and a reference value is calculated by a signal from the sensor, then an operational amount is detected by a controller 25, 35. After this, the amount is adjusted by moving a cylinder 21, 31 in a web width direction through the operation of a motor 23, 33.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to a multicolor rotary printing press such as a gravure rotary printing press or an offset rotary printing press, in which position adjustment in the groove direction r special registration mark? The present invention relates to a multicolor rotary printing method that can be adjusted without using the printer.

[Prior art and its top points]

Conventionally, in a multicolor rotary printing press, the pattern registration in the web running direction has been done by providing a registration mark (2) r provided in the margin of the cypress pattern (it) as shown in Fig. 6, and using this registration mark j2.
)? Detected by a sensor, and the web tension etc. are detected by the signal? Adjust and check the accuracy? I was adjusting.

On the other hand, when considering the pattern in the width direction of the web, as shown in Fig. 4, trapezoid-shaped registration marks 13) γ are provided in the margins, for example, the first color registration mark and the second color registration mark. If the width of the mark is shifted by one position, the width of the waveform will be different when detected by the sensor, as shown in Figure 5, and the cylinder of the second color will be activated by a servo motor, etc. based on the signal from the sensor to make the width of the waveform equal. It was moved and adjusted accordingly.

A register mark with a special shape like this? It is not a solution by installing it on the cylinder, but is it a pattern in advance? In order to add a new registration mark r in the shape described above to a cylinder that has been made into a plate, is it necessary to place it on a part of the image that has already been made into a plate? In addition, it would have to be printed on a new/rinder, making it unsuitable in terms of the amount of work, cost, etc.

[Problem to be solved]

Do you currently have an existing cylinder? It is an object of the present invention to provide a multicolor rotary printing method that can be used as it is and that allows registration adjustment of one picture in the width direction of the web without adding new marks etc. to the cylinder.

[Interval d point? Means to solve]

What is the distance between the pattern and the guide line, which is continuous in the web flow direction and is printed simultaneously with the first image in the first unit of the multicolor 4-print printing machine? As a reference value, in the printing process from the second unit onwards, the distance #l? between the guideline and the pattern? The problem was solved by detecting the difference γ between the skienning and reference values and operating the motors connected to the cylinders from the second unit onward to adjust the position xA of the cylinders in the web width direction.

[For production]

Since the guideline is printed at the same time as the pattern in the first unit, the distance between the pattern and the guideline is always constant in the first unit, so in the second and subsequent units, the distance from the guideline of the first unit is 4r.
What is the distance from the guideline of the pattern? Is there a shift in the web width direction of the Japanese cypress pattern due to scanning? Can be detected.

〔Example〕

The present invention will be described in detail.

First, as shown in Fig. 1, the 11 multicolor rotary stamps have a first unit I (1% second unit 12t) and a third unit ω.
... each unit consists of a cylinder (old)
121113t1. Pressure I] l+111121 pressure cylinder? Motor t1 for lateral movement
311,231 fields are 4, d.

Furthermore, after the 42nd unit, the motor 123) 1331 is activated by the signals from the sensor 12 and the sensor 24) and S41. tlJ (6
4 controller-1251C clause is provided.

The first unit 1 of the multicolor Ijaden printing press shown in FIG.
1 (I), guideline IBI is printed on web fA1 at the same time as pattern 10, and guideline IBI and pattern I
The distance to C) is constant.

This 1st unit OI guideline (old) and pattern + C1
Distance with oo￥: As a reference, after the second unit ■, mark -
1. Distance between the pattern and the guideline IBI? sensor c! 41(2), and by the signal of this sensor,! : Difference from semi-1st shift? out, controller (to) (to) detects operation, motor +231
ca Y operation, cylinder t211+411! This is a multicolor printing method that adjusts by moving the web in the width direction.

〔effect〕

Does the method of the present invention provide special register marks as described above? Is there a guideline to print at the same time as marking the pattern on the first unit without printing? What is the distance between this guideline and the pattern? By detecting this with the sensor, it is possible to adjust the web direction misalignment x, J4 of the designs after the second unit.

Is this a conventional special registration mark? Even cylinders that have not been made into a plate can be used without making a new plate, reducing the amount of work and cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a multicolor four-print printing machine, FIG. 2 is an explanatory diagram of the printing part of the web width direction of the present invention, and FIG. Are you sure about the flow direction? The attached explanatory diagram of the printed part, Figure 4, is the registration mark in the web width direction? The explanatory diagram of the attached printed part, Fig. 5, is the register mark r scanned signal in Fig. 4? FIG. A...Web B...Guidelines C...
・Picture ,25.33
...Motor 24.34. ...sensor 25.
35.・・・Controller Patent Representative Toppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] The distance between the pattern and the guideline that is continuous in the machine direction provided at the side edge of the web that is printed simultaneously with the pattern in the first unit of a multicolor rotary printing press is used as a reference value, and in the printing process from the second unit onward, the distance between the guideline and the pattern is A multicolor rotary printing method that scans the distance between the two units, detects the difference between the reference values, and moves the web in the width direction using a motor connected to cylinders from the second unit onwards.