JPS6246848A - Paper feed device for rotary printing press - Google Patents

Abstract

PURPOSE:To aim at stabilizing a brake force during splicing paper sheets, by providing a rotary potentiometer associated with the motion of a turn arm and generating a voltage value corresponding to the amount of the motion, and a controller for giving a brake force to a new roller paper sheet shaft in accordance with the voltage value. CONSTITUTION:During stationary printing operation, a circuit for controlling a brake 13 for an old rolled paper sheet is established, including an old rolled paper sheet diameter detector 9, a circuit 10, a tension controller 11 and a power amplifier 12. During splicing paper sheets, a deflection DELTAtheta of a turn arm 7 about a turn arm shaft 24s as a turning center is amplified and is converted into the deflection of the potentiometer, and therefore, it is possible to obtain the diameter data of a new rolled paper sheet. The diameter data of the new rolled paper sheet obtained before splicing the paper sheets, is automatically delivered to the tension controller through a new rolled paper sheet diameter detecting potentiometer 31, and is used as a data for the diameter of the rolled paper sheet just after the splicing to control a brake force, thereby it is possible to aim at stabilizing the tension of the paper sheet during splicing paper sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for a rotary printing press using a rotating reel stand.

[Conventional technology]

5 and 6 show an outline of a conventional rotating arm type paper feeding device 4), so FIG. 5 is a side view of the main part.

Figure 6 is a part of the circuit diagram of the old paper roll and the new paper roll tension automatic control device.

In FIG. 5, as printing progresses, the diameter of the old web 01 gradually decreases and when it reaches a specified value, the new web 040
The paster arm 03 rotates in the six directions of arrows at the paper end paste portion, and the two paper splicing brush 05 presses the new and old rolled paper to perform paper splicing. After the knife 06 operates to cut the old web, the paster arm 03 returns to rotation in the direction of arrow B.

07 is a rotating arm, and 08 is a reel stand.

In order to perform stable control in a paper tension control device for an offset rotary press, it is necessary to control the braking force of the web according to the diameter of the web during one unrolling. The diameter of the rotating web is a roll of known diameter (
It can be determined by comparing and calculating the rotation pulse of the measure roll and the rotation pulse of the take-up shaft.

However, immediately after the paper is spliced onto the new paper, the diameter of the new paper cannot be detected properly, which causes the tension when the two papers are joined to become unstable. Therefore, as a preparatory work before splicing, the operator inputs the diameter of the new roll paper measured in advance into the new roll diameter increase setting device 014, and only immediately after splicing the first paper, passes through the solid line circuit 015 to the tension control circuit 01 and the power amplifier 012. A circuit for operating the new web brake device 016 is formed through the.

[Problem that the invention seeks to solve]

If the new take-up diameter changes during paper splicing, the settings must be changed by the operator. If the manual force value of the new winding diameter is not set correctly, the brake control will not work properly. However, manual measurement and human power often involve human errors and fluctuations, making it impossible to stabilize the braking force during paper joints.

[Means for solving problems]

In the present invention, the rotating arm of the reel stand on which the new web is attached rotates from a standby position during the preparation stage for splicing one sheet to a splicing position where the new web and the paster brush of the paster arm maintain a constant distance. In the paper feeding device of a rotary printing press that is stationary.

A rotary potentiometer that operates in conjunction with the movement of the swing arm and generates a voltage value according to the amount of operation, and a controller that inputs the voltage value and applies a new web shaft braking force corresponding to the magnitude of the voltage value. It is an object of the present invention to provide a paper feeding device for a rotary printing press, which is characterized by the above-mentioned features and is capable of stabilizing the braking force when splicing two sheets.

〔Example〕

The present invention will now be described in detail based on the illustrated embodiments shown in FIGS. 1 to 4.

The swing arm 7 is rotatably mounted on the reel stand 8 via the swing arm shaft 24θ, and one set of swing arms is formed on the drive side and the operating side, and both ends of the swing arm are connected to the old roll paper 1 and It has a structure in which the new web 4 can be rotatably held.

The swing arm 7 is permanently equipped with two tension rolls 22,22 (
Rift L is here. The machine frame 2o is equipped with a rotating arm 7 that is rotated in preparation for paper splicing, and stopped when the rotating arm is brought to rest at a position where the surface of the new web 40 and the paster brush 5 in the paster arm 3 maintain a constant distance. A light emitter/receiver 2 for detecting the position is arranged, and a guide roll group 21
The paster arm 3 is swingably supported via an upper support i11+, and the upper support bin of the fluid cylinder 23 is fixedly mounted. The lower bottle of the fluid cylinder 23 is fitted into the paster arm 3, so that the paster arm 3 can be swung left and right by operating the fluid cylinder. The pivot arm shaft 246 is connected to the cam shaft 268. It is rotatably supported by a part of the machine frame 2o together with the sector gear shaft 28s and the binion shaft 29B. The deviation Δθ of the swing arm 7 about the swing arm axis 248 is determined by the large gear 24. Small gear25. Cam plate 26. Cam follower 27.
The mutual combination of sector gear 28 and pinion 29 amplifies and converts the displacement of potentiometer 30 .

FIG. 3 shows a correlation diagram between the potentiometer output and the winding diameter, which shows that the diameter of the new roll can be directly read from the change in the output corresponding to the i position of the potentiometer 3o. In Fig. 4, during steady printing, the pulse output from the rotation speed detection transmitter installed at the end of the old web shaft is transmitted to the old winding diameter detector 9.
The tension controller 11 is connected through a circuit 10 indicated by a dashed line. A circuit for operating the old web brake device 13 via the power amplifier 12 is formed. What is different from the conventional method is that a new winding installation detection potentiometer 31 is provided in place of the new winding diameter increase setting device.

In this way, the diameter data of the new roll paper obtained before paper splicing is automatically input to the tension control device via this new roll diameter increase detection potentiometer 3], and is used to control the brake force as the data of the winding diameter immediately after the two paper splices. It is useful for stabilizing the tension when joining the paper.

〔Effect of the invention〕

In this way, the present invention detects the momentum of the new paper web in the preparation stage for paper splicing using a rotary potentiometer that is linked to the movement of the rotating arm, and applies a braking force to the new paper web shaft corresponding to the magnitude using the controller. The tension is stabilized over time, resulting in high quality printing. or.

Significant labor savings are also possible.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a side view of the main parts, FIG. 2 is an explanatory diagram of the potentiometer drive system, FIG. 3 is a correlation diagram between the potentiometer output and the winding diameter, and FIG. FIG. 4 is a block diagram illustrating a control device, FIG. 5 is a side view of main parts of a conventional sheet feeding device, and FIG. 6 is a block diagram illustrating a conventional web tension automatic control device. 3... Paster arm, 4... New roll paper, 5...
Paster brush, 7... Swivel arm, 8... Reel stand, 11... Controller, 30... Potentiometer. 1z Figure 2 Figure 4 Figure 5 Figure 6 Haze

Claims (1)

[Claims] Rotary printing in which the rotating arm of the reel stand equipped with a new web roll rotates from a standby position to a splicing position where the new web paper and the paster brush of the paster arm maintain a constant distance and remains stationary as a preparation stage for splicing. In the paper feeding device of the machine, a rotary potentiometer that operates in conjunction with the movement of the swing arm and generates a voltage value corresponding to the amount of operation, and a new paper roll shaft brake that inputs the voltage value and corresponds to the magnitude thereof. A paper feeding device for a rotary printing press, comprising: a controller for applying force.