JPS6228063B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a paper folding device in which a continuous printing paper used in a printing device such as a line printer is folded alternately from front to back by a swing fin that operates in a pendulum manner.

As is well known, in a paper folding device using such a swing fin, the paper that comes out through the swing fin is driven by driving the swing fin in accordance with the paper folding length, that is, the length of one page of paper. The folding operation is performed continuously by being guided in the direction of the creases provided at regular intervals. i.e. 1/of the swing fin
One page of paper is folded with two reciprocating pendulum movements, and 1/2 of this swing fin is made in S steps regardless of the length of one page of paper.The folding length of the paper is M inches, and the paper is 1 inch. Assuming that the number of paper feed pulses generated each time the paper is fed is P, and the swing fin is moved one step by counting q pulses of paper feed pulses, the swing fin is driven so that the relational expression MP=qS holds. Paper is folded by control.

In the paper folding device, a paper feeding roller (hereinafter referred to as a puller) that rotates at a predetermined speed is provided in order to feed the paper sent from the printing device to the swing fin. There are many different lengths of paper used in printing devices, but the pendulum movement speed in one step of the swing fin is the speed that can keep up with the amount that the shortest length of paper that can be used by the printing device is fed out from the puller. It's getting old.

However, the shortest length of paper is rarely used, and longer paper is generally used. For this reason, the pendulum movement speed at each step of the swing fin is set as described above, so when long paper is used, the pendulum movement of the swing fin becomes step-like and makes rapid movements. Become. As a result, there is a drawback that the paper moves and folding of the paper is not performed properly.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to change the pendulum movement speed at each step of the swing fin for each folding length of each sheet, thereby reducing the amount of paper that occurs due to the sudden movement of the swing fin. The purpose is to reduce the undulation and fold the paper properly.

When the paper feeding speed of the puller is L inches/second, the minimum operation time when folding a paper sheet with a folding length of M inches by the pendulum motion of the swing fin in 1/2 reciprocation is M/L seconds. Assuming that the swing fin is made to reciprocate once by two revolutions of the motor that drives the swing fin, the number of revolutions of the drive motor is L/Mrps. By controlling the speed of the drive motor in accordance with the folded length of the paper in this manner, the swing fin follows the paper feed amount and smoothly oscillates, resulting in good folding characteristics.

The present invention will be explained below with reference to embodiment drawings.

Continuous printing paper 1 is transported by a tractor 2, and printed on it by a printing section consisting of a printing hammer 3 and a type transport body 4. The printed paper 1 is sent from the printing device 10 into the paper folding device 20, folded alternately from front to back through a puller 5 and swing fin 6, and stacked on a paper holder 8. The swing fin 6 is driven by a drive motor 7 and performs a pendulum operation.

In FIG. 2, it is assumed that the control pulses are paper feed pulses generated each time the printing device 10 feeds the paper 1 a predetermined length, and as described above, P control pulses are generated every time the paper 1 is fed by 1 inch. The paper length information is an information signal indicating the folded length of the paper 1 to be used.

The paper length switching control unit 29 is composed of a memory such as a ROM, for example, and stores the numerical value q and the cycle data of the drive pulse for driving the drive motor 7 for each folded length of the paper 1. . Therefore, the switching control section 29 sends the numerical value q corresponding to the folded length to the counting control section 21 in accordance with the input sheet length information, and also sends the periodic data to the motor speed control circuit 28. send.

The counting control section 21 is composed of, for example, a counter and a decoder, and counts the control pulses. When the count value matches the numerical value q input from the switching control section 29, it generates an output, and up-downs the output. Add to the addition input terminal of the counter 22. The output of the counter 22 is applied to an amplifier circuit 24 via an OR gate 23. When the output from the OR gate 23 is input, the amplifier circuit 24 supplies the output of the motor speed control circuit 28 to the drive motor 7, drives the motor 7, and starts the pendulum operation of the swing fin 6.

Here, it is assumed that the swing fin 6 performs 1/2 reciprocation, that is, one-way movement in 12 steps, and makes one reciprocation for every two revolutions of the drive motor 7. The number of slits in the encoder 25 directly connected to the drive motor 7 is 360.
shall be. Encoder pulses from the encoder 25 are input to a counter 27 and a motor speed control circuit 28 via an amplifier circuit 26. The counter 2
7 is the encoder pulse of encoder 25 of 30
(=360/12), that is, when the swing fin 6 moves by one step, it is composed of a 30-decimal counter that generates an output and inputs it to the subtraction input terminal of the up-down counter 22. Therefore, the up-down counter 22 starts driving the drive motor 7 upon receiving the output from the counting control section 21, and when the swing fin 6 moves one step and the counter 27 generates an output, the up-down counter 22 starts driving the drive motor 7.
It acts to stop the Speed control circuit 28
compares the periodic data from the switching control section 29 with the encoder pulse from the amplifier circuit 26, and controls the speed of the drive motor 27 to a speed corresponding to the periodic data.

If the paper feeding speed by the puller 5 is L inches/second, the period T of the output pulse of the encoder 25 when folding the paper 1 with a length of M inches is M/(L×360), so the encoder 25 The speed of the drive motor 7 is controlled by the speed control circuit 28 so that the output pulse period of the drive motor 7 is T seconds.

Therefore, the paper length switching control section 29 stores the cycle data of M/(L×360) for each folding length of the paper 2.

Therefore, the drive motor 7 can drive the swing fin 6 at a speed corresponding to the folded length of each sheet 2 during the pendulum operation at each step of the swing fin 6. It is possible to prevent the paper 2 from dancing and to fold the paper 2 well.

As described above, according to the present invention, the pendulum movement at each step of the swing fin can be changed for each paper length, and the longer the paper, the slower the pendulum movement speed, which prevents sudden movements of the swing fin. It is possible to reduce folding defects caused by paper undulating. In addition, the noise caused by the paper can be reduced, and the vibration of the mechanical system can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of a folding device to which the control device of the present invention is applied, and FIG. 2 is a block diagram showing an embodiment of the control device of the present invention. In the figure, 1 is paper, 6 is a swing fin, 7 is a drive motor, 8 is a paper holder, 10 is a printing device, 2
0 is a paper folding device, 21 is a counting control unit, 2
2 is up-down counter, 23 is or gate,
24, 26 are amplifier circuits, 25 is an encoder, 27
28 is a motor speed control circuit, and 29 is a paper length switching control section.

Claims (1)

[Scope of Claims] 1. Continuous printing paper having creases at regular intervals that falls from above is folded by a swing fin that is step-driven by a drive motor and operates as a pendulum in the folding direction, and placed on a paper holder alternately front and back. In a sheet folding device for folding and stacking sheets, the sheet length switching control unit stores periodic data of drive pulses of the drive motor for each folding length of each sheet, and a sheet length switching control unit that stores periodic data of drive pulses of the drive motor for each folding length of each sheet, and a paper length switching control unit that stores cycle data of drive pulses of the drive motor for each folding length of each sheet, and a motor speed control means for receiving a drive pulse of periodic data from the paper length switching control section and applying it to the drive motor, and driving the drive motor, and controlling the pendulum operating speed of the swing fin at each step of the printing paper. A control device for a paper folding device characterized by changing the folding length according to the folding length.