JPH0412226B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present application relates to a rotary printing machine that requires high accuracy in alignment between a printing surface and a processing position of a folding machine or the like.

Conventional Technology and Problems Conventionally, in rotary printing machines for printing materials such as continuous paper or continuous vinyl sheets, in order to improve printing accuracy by uniformizing the feeding tension of the traveling printing material,
Rotary printing comprising a tension detector that detects the feeding tension and a tension adjustment means having, for example, a dancer roller, that adjusts the feeding tension based on the detection output between the roll of the printing material and the printing section. The machine is known.

However, according to the rotary printing press that is equipped with a tension detector and a tension adjustment means between the roll of the printing material and the printing section as described above, the printing accuracy after the part where the tension is detected has the greatest effect. Subtle tension fluctuations in the paper that occur in the affected printing section, such as changes in paper expansion and contraction due to adhesion of water and ink or drying in the case of offset printing, fluctuations in the contact pressure between the printing cylinder and the impression cylinder, or temporary interruption of operation. It is extremely difficult to adjust the feed tension fluctuations due to fluctuations in the inertial motion of the rotating mechanism when restarting the machine. It is necessary to adjust the printing pressure, synchronization, etc., but since there is a tension detector in the part before the printing section, adjusting the printing pressure, synchronization, etc., and matching this with the feed tension is extremely complicated. This method is disadvantageous in that it takes a long time and causes a lot of printing waste, and this defect has become a big problem, especially in printing, for example, copy slips, which require accurate overlapping of printing positions.

OBJECTS, EMBODIMENTS, AND OPERATIONS OF THE INVENTION The present application aims to improve the deficiencies of the prior art, and embodiments thereof will be described in detail below with reference to the drawings.

FIG. 1 shows a configuration diagram in which only a single printing system A is detailed, main parts of other printing systems B to E are omitted, and a copy slip is created by overlapping printed materials. A winding body 2 that winds up the printing material
is rotatably supported on the support stand 3. The printing material 1 pulled out from the roll 2 is moved through a pair of guide rollers 4, one dancer roller 5 located between them, a feeding section 6 consisting of three feeding rollers, and one dancer roller 7. It is guided to the printing section 9 via one guide roller 8 . Said first
The dancer roller 5 is connected to a movable part of a pressurized fluid actuating part 11 operated by a manual adjustment part 10, for example, and is moved up and down in the figure by the pressurized fluid actuating part 11 to move the printing material to be sent out from the roll 2. Adjust the feed tension in step 1. The printing section 9 includes a plate cylinder 9a
, a blank cylinder 9b, and an impression cylinder 9c, and a plurality of printing units 9 are arranged in the transport direction of the printing medium 1 as necessary. A tension sensor 12 is provided. This tension detector 12 has a fluid control section 13 that operates in accordance with its detection output, and this fluid control section 13 is controlled by the fluid control section 13 to movably displace the second dancer roller 7 to print on the printing material. A second pressurized fluid operating body 14 for adjusting the feed tension of the bodies 1 is connected to each.

A second feed roller 15 is located behind the tension detector 12, and a guide roller 1 is located further behind that.
6, a superimposing section 17 for superimposing printed substrates 1 from other printing systems B to E together, and a perforation,
Post-processing section 18 that performs cutting, bending, additional printing, etc.
are arranged respectively.

According to the present application, the printing material 1 fed out from the roll 2 includes the guide roller 4, the first dancer roller 5, the first feed roller 6, the second dancer roller 7, the guide roller 8, the printing unit 9, the tension detection Vessel 12,
Second feed roller 15, overlapping section 17 and post-processing section 1
8, and in this process, the first dancer roller 5 performs coarse adjustment of the paper feed tension, and the second dancer roller 7 performs fine adjustment of the paper feed tension.

In the above description, the dancer rollers 5 and 7 are moved by the pressurized fluid operating bodies 11 and 14 to adjust the paper feed tension, but the tension adjustment means is not limited to the above configuration.

Effects of the Invention As described above, according to the present application, it is possible to effectively detect fluctuations in the feeding tension of the printing material caused by the printing section, which is the most important factor for printing accuracy, and to output the detected output. This is a configuration in which the feeding tension adjusting means provided between the printing section and the preceding feeding roller is actuated by the printing unit, so it is possible to perform rotary printing with extremely high printing accuracy, and the configuration is simple and inexpensive. It is easy to maintain, and is particularly effective for correctly overlapping multiple sheets of printed paper, such as for creating copy slips, etc., as well as when converting a new roll or when the printed content has changed. Adjust the feed tension matching,
Providing a tension detector after the printing section has the advantage that it can be carried out quickly and efficiently, and that printing waste can be greatly reduced.

[Brief explanation of drawings]

The drawings are configuration diagrams showing embodiments of the present application. In the figure, 1 is a printing medium, 2 is a winding body, 6 is a first feed roller, 7 is a dancer roller, 9 is a printing section, 12 is a tension detector, 13 is a fluid control section, 14 is a pressurized fluid operating body, 15 is a second feed roller, 17 is an overlapping part,
18 is a post-processing section.

Claims (1)

[Scope of Claims] 1. During the process in which the printing material sent out from the roll of the printing material passes through the feed roller, the printing section, and the post-processing section, a tension detector is installed between the printing section and the post-processing section. A rotary printing press, comprising: a tension adjusting means for adjusting the feeding tension of the printing medium based on a detection output from the tension detector, between the printing section and the feeding roller. 2. In a configuration that includes a plurality of printing systems and overlaps printed paper from each printing system at a position before the post-processing section, a tension detector is installed between the overlapping section and each printing section in each printing system. A rotary printing press according to claim 1, wherein the rotary printing press is provided with a plurality of rotary presses. 3. The tension adjusting means comprises a dancer roller movable in a direction perpendicular to the surface of the printing medium, and a processing fluid operating body that moves the dancer roller in response to a detection output from a tension detector. 1
The rotary printing press according to item 1 or 2. 4 Claim 1 in which the printing material is continuous paper
3. The rotary printing press according to item 1, 2 or 3.