JPS59136260A - Device for positioning band material of printing-punching and emboss overall machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing paper, adhesive paper, cartons, metal or plastic sheets, or composites thereof, in which a strip is moved stepwise and translated by a plurality of processing stations, such as a printing device. In the processing of strips, such as materials, the strip is advanced through a plurality of processing points provided in a line at each stage by exactly a piece length that ensures precise processing in register at a certain or several subsequent points. Difficulties arise. This is especially the case when materials with low or varying modulus of elasticity have to be processed. Materials with a low modulus of elasticity, such as special plastic films, can be subject to elongation and differential elongation due to the tension in the strip required for processing. and/or chemicals applied during processing, such as ink. The change in elongation is due to the fact that when separating paper, the humidity conditions inside the paper roll itself change from the outside to the inside, so different feed lengths can occur with a uniform strip tension equilibrium. It may occur due to Significant misregistration can therefore occur.

Attempts were made to determine the difference in the tension-pulled transport length by scanning a plurality of markings and thus to compensate for the deviation by movement of the processing location itself on the stationary strip. This method did not help. This is because it is necessary to move large masses by expensive means, which extremely slow down progressive machining due to the moment of inertia of the large masses. The object of the present invention is to perform step-by-step processing at several processing points at constant strip tension, even though the actual length of the strip drawn forward may vary due to low or varying elastic modulus. The object of the present invention is to develop a device which guarantees accurate positioning of the strip that is to be drawn forward and stopped for processing.

The main solution is carried out with a device consisting of an electro-optical scanning device for a plurality of strip markings, a programmable computer and a feed device that can be controlled by this computer. The feed device, which is independent of the main drive of the printing machine, is moved by a direct current drive that is aligned and stepped electronically. By means of electro-optical scanning, the length of the strip to be drawn forward in each case is determined via the computer and compared with the target length to be drawn to the processing location. The difference in feed length is then compensated for by appropriate control of the feed device.

In known printing machines, the aim is to minimize the number of single passes in the processed strip piece. This is because the shorter the length of the stretched strip, the more likely it is that elongation changes will occur. However, up to 20 single feeds can be required to draw the working length into the printing machine. With the device according to the invention, the result is that in the case of 20 single feeds, first 19 feeds are drawn in, for example by an electronically controlled roll feed, and the length of the single feed draws out how many meters. ignore it,
It is ensured via the scanning device and computer that it is exactly equal to the length between the two marks.

The number of feeds during the draw-in and the actual length in meters are obtained by the computer and are therefore compared with the target length and compensate for the difference measured by controlling the feed of the last piece. Preferably, the scanning device is arranged immediately after the entrance of the strip with the plurality of markings. This is because the strip material immediately after the inlet of Suzeraba is in a relatively ideal state of stabilization and cooling consisting of the loop in front of it. With the aid of a computer it can be ensured that only the strip pieces resulting from the actual distance between the two markings are fed into the printing machine. If the actual distance is smaller or greater than the target distance entered into the computer due to changes in the strip after the markings have been installed, the resulting error will be sent through the computer, ignoring the markings. compensated by the control of

When using materials that are modified during processing by the influence of chemical agents such as ink or by heat removal, e.g. drying of overprint ink, or by cutting and punching processes, the strip material It is advantageous to arrange the scanning device relatively close in front of the nearest processing point where a change in length can occur. Therefore, subsequent machining is carried out accurately.

For a detailed description of the invention, reference will be made to embodiments according to the invention that are illustrated in the accompanying drawings.

The printing machine 1 shown in FIG. 1 consists of a rewinding device 2, a translational printing section 3, a translational punching device 4 and a grid drawer, longitudinal cutting and winding device 5. The paper strip wound on the roll 6 is rotated out of the unwinding device and is thus fed into a loop 7 in which the paper strip is suspended and stable.

The printing parts that undergo translational work include, for example, three large-area printing devices 8, 9, 10 and two punching devices 12 and 1! A subsequent translational section consisting of I, from which punching devices the predetermined punching forms have to be punched out dimensionally into the preprinted printing forms.

A loop 11 provided between the printed part 3 and the processed part 4
An electronically controlled DC drive device 15 for the roll feed device 16 is provided behind the processing section 4.
Step by step pull in the paper strip.

At the end of the working part 4 there is a further roll feed device 17 with a constant torque drive 18 which applies and holds a predetermined constant tension.

As can be seen from FIG. 2, an electro-optical scanning device 19 is provided above the paper strip behind the roll feed device 16, and this scanning device scans the markings attached to the paper strip. , thus transmitting the scanning information to a computer not shown. The roll feeding device 16 is controlled by the computer via the DC drive device 15 so that it only draws in the length of the paper strip corresponding to the distance of the marking.

Assuming that 20 feeds are required to feed a given working length from the inlet to the punching device, first 19 feed lengths are fed according to the distance between the two markings. During this process the computer adds the respective measured distances between the two markings. After reaching the 19th feed, the difference between the target swath length for the 20th feed and the swath length to be pulled forward for the 19th feed is determined in the computer, and thus The determined difference in meters is transmitted from the computer to the control device of the DC drive 15 as the target value for the 20th feed. For the first time, the roll feeding device 16 conveys a certain length of paper strip in accordance with the target input, regardless of the marking.

The device according to the invention can also be provided between the inlet and the punching device in case of registration inaccuracies during printing that have to be corrected.

The device according to the invention has the advantage that it is possible to achieve high registration accuracy even with sensitive materials. In fact, it is possible to process a paper strip that has been processed once again in the same printing machine or in another same printing machine, without having to wrap the paper strip around it. If the paper strip has a positive error during the first processing, the paper strip has a negative error that is updated but compensated for during the return process.

Another advantage may be that rolls and rollers made of lighter materials can be used in printing machines compared to the known and highly accurate steel rolls, and peripheral inaccuracies can be ignored. This is because all inaccuracies limited by the printing machine are compensated for by controlling the feed. Due to the use of lightweight rolls, it is advantageous to use drives that are relatively lightweight and therefore have relatively low inertia. This is because relatively little mass needs to be moved. It is also possible to use a disc armature DC motor to drive the rolls and the feed device, which, because of its low mass, reacts quickly to control actions. This again has the advantage that the electronic control unit is not influenced by undesired moments of inertia.

Another advantage of the device according to the invention is that it results in a considerably improved and therefore economical device for printing machines.

The equipment of the printing machine must be carefully prepared to take into account the necessary observations and to avoid large material consumption. In such external machines, if the web feed is carried out via the main drive of the machine, the web feed is also slow during servicing. A slow feed relative to the standard drive during maintenance can affect the paper web.

This is because the elongation of the paper strip also depends on the speed at which the paper strip is pulled forward. In contrast, the device according to the invention makes it possible to feed the paper strip at a preselected speed relative to the standard drive even during maintenance, and also allows the work process controlled by the main drive to run at a slow speed independent of the feed. can proceed at high speed.

Furthermore, this device can obtain an optimum feed rate that is independent of the speed of the processing process by inputting various material and processing criteria into the computer.

[Brief explanation of drawings]

1 is a schematic side view of a printing machine having a device according to the invention, and FIG. 2 is a schematic side view of a feed device of the printing machine. 15... DC drive device 16.17... Roll feeding device 18... Constant torque drive device

Claims (1)

Claims: t. Roll transport device (16) and constant torque drive driven by an electronically controlled direct current drive (15)! (1B) and a roll transport device (17) driven by a roll transport device (17), which is then provided with a positioning device for strips with a plurality of working locations, preferably with a combined printing, punching and embossing mW. Device characterized in that a programmable computer is provided for controlling the stepped positioning DC drive (15). 2 The marking scanning device (19) is connected to the roll feeding device (1
6) A device according to claim 1, characterized in that the device is provided immediately after the step 6). 6. Device according to claim 1, characterized in that the marking scanning device (19) is arranged immediately before the punching device (12, 13) or the printing device (8, 9, 10). .