JPS5878765A - Rotary printer with endless-belt-shaped plate cylinder - Google Patents

Abstract

PURPOSE:To correct the positional slippage of a pattern from a printed pattern and to facilitate the manufacture of a plate cylinder by a constitution wherein a mechanism fo detecting a phase difference between the pattern of an endless- belt-shaped plate cylinder of a rotary printer printing discontinuos patterns and a printed pattern on paper is linked to a mechanism for controlling the speed of rotation of the plate cylinder or a positioning mechanism therefor. CONSTITUTION:A mark P is attached to an appropriate place in a blank part (b) located in front of a pattern 3' of a plate cylinder 1, while a mark Q is attached in a blank part (a) located in front of a position on printing paper 6 whereat a printed pattern is formed, and the time points of passage of the two marks P and Q are detected by photoelectric detecting devices 8 and 9. When the feeding speed of the plate cylinder 1 is controlled, the speed of rotation of a rotating cylinder is adjusted by counting a timing whereat the blank parts (a) and (b) reach the position of transfer printing. When the position of the pattern of the plate cylinder 1 is corrected, a guide cylinder 5 is made separable from the rotating cylinder 4, while only the blank part (b) of the plate cylinder 1 is made flexible so as to be matched with the blank part (a) of the paper 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary printing press that prints discontinuous printing patterns;
In particular, the plate cylinder is formed using an endless band, and the production tube for one plate cylinder is particularly characterized by a significantly reduced manufacturing cost.

A rotary printing press is a printing machine that uses a cylindrical plate cylinder and transfers the printed pattern in nine patterns onto the circumferential surface of the plate cylinder. Conventionally, art materials such as cardboard are cut in advance into nine dimensions corresponding to the unfolded shape of the product box, and then the paper is printed one by one. This is because art paper is so thick and strong that it cannot be sharpened when rolled, so inefficient methods had to be used. In contrast, recently there has been a demand for improved printing speed mainly from a cost perspective, and in recent years, paper for art has diversified, such as weak cardboard paper and surfaces that are difficult to print with conventional methods. A method is being considered in which printing is performed on box material paper having a transparent pattern, and then the paper is used as art material paper. This method uses rolls of thin paper, so it can be printed using a regular rotary printing machine.
This significantly improves printing efficiency, but on the other hand, rotary printing presses are suitable for large-volume printing, but the lot size of face material paper is small, and the shape of the product, the box, is not constant and is rarely used. Since each plate cylinder has a different size and shape, it becomes difficult to manufacture the entire plate cylinder. In other words, the plate cylinder must be formed so that its outer circumference closely matches the pitch of the printed pattern 6], so if the pitch of the printed patterns differs in the printing of the above-mentioned face material paper, the plate cylinder Because it is not possible to specify the dimensions in advance and then manufacture according to those specifications, products with dimensions that match the pitch of the printed pattern must be manufactured each time an order is received.
It took a lot of man-hours, cost and tPl to make this! That's what I do. In addition, the number of plate cylinders required is equal to the number of colors used for one printing, so in order to print face material paper, it is necessary to manufacture a large number of plate cylinders and stock them. Cost and location tl! This, combined with the fact that the printing lot of face material paper is small, reduces printing efficiency, delays delivery, and increases printing costs by 1.

This FIA was developed in view of the above points, and the printed pattern is discontinuous, like the raw material paper for the facing paper, and there is an appropriate blank space between the printed patterns. The purpose is to provide a rotary printing press for printing printed matter, and in particular, the plate V4 is formed using an endless band, which makes it easy to manufacture, and allows a plate cylinder of the same size even if the pitch size of the printed pattern is slightly different. This reduces the number of types of plate cylinders, standardizes their dimensions, and significantly reduces production costs, thereby lowering printing costs and shortening delivery times. .

The present invention will be described in detail below based on the illustrated embodiments. I will clarify. Reference numeral 1 in the figure is a plate cylinder. This material is formed into an endless shape using a suitable flexible material such as synthetic rubber, rubber, urethane rubber, or TD C') Congo A, and of course has a printed pattern 2 on its surface. A corresponding pattern 3 is engraved. This plate is an integer multiple of one pitch of the printing pattern 2, or is approximately nine in length, and is suspended between the rotary pj 44 and the guide cylinder 5 to form a nine-plate cylinder corresponding to the so-called conventional cylindrical plate cylinder. It consists of
Needless to say, since the shapes and dimensions of printing horizontal pattern 2 and pattern 3 are the same except that they are both inverted, the pitch of printing horizontal pattern 2 and the pitch of pattern 3 are the same. If they do not match, the length of the blank portion of pattern 3 is different from the length of the blank portion of printing press s2.

Reference numeral 6 is printing paper, and 7 is an impression cylinder. This printing paper 6
The relationship between pressure 8PI7 and plate cylinder 1 is the same as that of a normal rotary printing press, and the 9 ink applied to pattern 3 of plate cylinder 1 is transferred to printing paper 6, so p1 is not shown, but it is a rotary printing press. Depending on the type of oak, a blanket cylinder is interposed between the plate cylinder 1 and the printing paper 6. This rotary printing machine corrects the difference in length between the pitch of printed pattern 2 and the pitch of pattern 3, in other words, the length of the blank space between printed pattern 2 and the blank space of pattern 3. The pattern 3 is provided with a mechanism for matching the positional relationship between the pattern 3 and the pattern 3 and overlapping them.

Next, a mechanism for matching the positional relationship between the printed pattern 2 and the pattern 3 will be explained in detail. In FIG. 2, (a) shows a shape 11 in which the blank area between the patterns 30 on the plate cylinder l is longer than the blank area a of the printed pattern 2 on the printing paper 6, and the plate cylinder l is shown in an extended state. Needless to say, the pattern 3 engraved on the cylinder IK is sandwiched between the rotary cylinder 4 and the impression cylinder 7 and is transferred to the printing paper 6 at the friendly part, so the positional relationship between the pattern 3 and the printed pattern 2 is different in this part. They match, but the pattern 3' that is then injected into the transfer position and the position 112' that should be the printed pattern are shifted by the blank area a and bζ, so 1. f('') (b) shows an example of a method for correcting the positional deviation between the two, and the blank part 1 and b are located between the rotating cylinder 7 (transfer position). When reaching 9, the rotation is accelerated and the plate cylinder 1 is rapidly fed by an amount corresponding to the difference between the blank areas & and b. (C) is another example, in which blank areas a and b are transferred. Before reaching the position ', the blank part of the plate cylinder 1 is shortened to match this length t-&. There is no particular limitation on the method of detecting the positional deviation from the 2° position where the printed pattern on the paper 6 should be. Sen P (
For example, a through hole) T- is attached, and a mark 11 is placed in the blank area a in front of the position where the printing pattern on the other printing paper should be. Q is attached, and photoelectric detection devices i8 and 9 are installed on the respective travel tracks of both markers P%Q, so that both markers P%Q
By detecting the time point at which the two lines pass, the deviation between the two positions is detected, and the corrections shown in (B) and C above are performed. That is, (
→ When adopting the method of sub-indicating the feed speed of the plate cylinder 1, the rotary cylinder 4 is equipped with a side line mechanism similar to the plate cylinder rotation speed side line mechanism in conventional rotary printing presses, and After detecting the deviation between the passing points of P and Q, the rotational speed t of the rotary cylinder 4 is adjusted by timing the blank area &b to reach the transfer position, and (c) the correction method shown in K is When adopting the guide cylinder 5, the guide cylinder 5 is provided so as to be releasable from the rotary cylinder 4, and a positioning mechanism is connected to this so that the plate cylinder 1 can be expanded and contracted by changing the distance from the rotary cylinder 4. 1 forms only the blank space so that it can be expanded and contracted. As a means to make the blank space stretchable, for example, the plate cylinder 1 may be made of an elastic material such as synthetic rubber to make the blank space thin, or a steel tape may be attached to the back of the area where the pattern 2 is engraved. etc. to prevent this part from expanding or contracting. The guide cylinder 5 is immediately moved closer to the rotation 1@4 to shorten the blank portion bf, thereby making it coincide with the blank portion a.

As described above in detail, the present invention is a rotary press that prints discontinuous printing patterns, in which the plate cylinder is formed using an endless belt, and the phase of the pattern engraved on the plate g4 and the printed pattern on the printing paper is Equipped with a mechanism to correct misalignment, the production of the plate cylinder is extremely easy, and since the plate cylinder does not need to match the pitch of the printed pattern, standardizing its length becomes a ciJ function. This has many advantages, such as making it possible to stock endless strips as material for plate cylinders, and making it easier to store finished copper plates.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention, and FIG. 2 is a principle diagram showing a method for correcting misalignment between a pattern and a printed pattern. 1; plate cylinder 2; printing pattern 3; pattern 4-rotating cylinder 5; guide cylinder 6; printing paper 7; impression cylinder (c)

Claims (1)

[Claims] In a rotary printing press that prints discontinuous patterns, the plate cylinder is formed using an endless band, which is connected to the guide cylinder, rotary cylinder, and KJI, so that one point in the blank area of the pattern on the plate cylinder and the printing pattern on the printing paper are connected. A mechanism that detects the phase difference with one point in the blank area,
A mechanism for controlling the rotation speed of the rotary cylinder or a mechanism for positioning the guide cylinder, and a mechanism for correcting the positional deviation between the pattern and the printed pattern by connecting this with the mechanism for detecting the phase difference. A rotary printing machine featuring