JPS6038301B2 - paper folding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper folding device having swing fins for folding continuous printing paper alternately front and back, and a cutting means for cutting the paper every time a print job is completed.

Generally, in a folding device, the paper that has been folded and accumulated on the table is ejected every time a job is completed, but it is necessary to stop the printing device at the time of such ejection, which reduces the edge utilization rate of the printing device. There was a problem.

For this reason, it has been proposed to stop ejecting the paper after each job and stack paper one after another, but it is said that the next paper will not be folded unless the end of the cut paper is folded accurately and securely. There were drawbacks.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to enable accurate and reliable folding of the trailing edge of a sheet.

The present invention focuses on the fact that when the swing fin is operated at a slower speed than the normal speed when processing the end of the paper, the end of the paper is reliably folded. It is characterized by the fact that

FIG. 1 is a schematic diagram of a paper folding device.

In FIG. 1, a continuous printing paper 1 discharged from a printing device (not shown) is sent by a tractor 2 and guided to a swing fin 8 via a pair of rollers 3, 13, 4, 14 and 5, I5, respectively. The paper is then folded alternately front and back by the swing fins 8 and deposited on the table 9. 6,
16 is a guide.

- Said rollers 3, 13
assumes that the paper 1 is fed at the same speed as the tractor 2, and the rollers 4, 14 and rollers 5, 15 are used to feed the paper 1 at a slightly faster speed than the rollers 3, 13 so that the paper does not slacken in the middle.
Suppose you send

The roller 14 is normally located above as shown by the broken line,
It is assumed that when a cutting command, that is, a signal cutting command, which will be described later, is generated, the line falls as shown by the solid line. When the roller 14 descends and contacts the roller 4 through the paper 1, the rollers 3 and 1
Due to the speed difference between the paper 1 and the loaves 4 and 14, tension is applied to the paper 1 between them. Thereafter, the paper 1 is cut by lowering the blade 7. Cut paper 1
is sent toward the swing fin 8 by rollers 4 and 14 and rollers 5 and 15. As is well known, the swing fin 8 swings back and forth once every two pages of paper 1 is fed, and the swinging speed is equal to the paper feeding speed of the rollers 3 and 13 before cutting.
After cutting, the paper feed speed of the rollers 4, 14, etc. is controlled to correspond to the paper feeding speed. In FIGS. 2 to 5, the swing fin 8 is operated at the same speed as the rollers 4 and 14 and the rollers 5 and 15 during the termination process. As shown in FIG. 4, when the swing fin 8 is at the rightmost position and the end of the paper 1 is in a position where it passes through the swing fin 8, the paper 1 becomes free between the folded paper 1 and the swing fin 8. As shown by the solid line or broken line in FIG. 5, it is not possible to reliably fold the end of the paper 1. Figures 6 to 9 show the speed of the swing fin 8 during end processing being slower than the rollers 4, 14 and rollers 5, 15. Since the paper 1 is forcibly guided toward the paper holder 9 by the fins 8, the end of the paper 1 can be surely folded. The control circuit will be explained below with reference to FIG. 10 showing the control circuit.

The paper feed signal is a pulse generated every time the paper 1 is fed by a unit amount, and is generated, for example, from an encoder attached to a drive shaft (not shown) of the tractor 2. The paper folding length information is the length of one page of paper, the paper feed information is information indicating the distance between the blade 7 and the swing fin 8, and the signal cut command is a logical value generated when the crease to be cut is located on the blade 7. 1 pulse. Reference numeral 21 denotes an oscillator that generates pulses with a period longer than the period corresponding to the paper feeding speed of the rollers 4, 14 and 5, 15.

The counting control unit 22 drives the swing fin drive motor 26 via the amplifier 28 so that the swing fin 8 reciprocates once every two pages of paper 1 are fed.
The paper folding length information is input, and a paper feed signal is used before the paper is cut, and a pulse is generated every time a predetermined number of oscillation pulses from the oscillator 21 are input after the paper is cut. When the signal cut command is generated, the flip-flop 24 is set, and its 0 side output closes the asod gate 30, thereby prohibiting the paper feed signal from being applied to the counting control section 22.

Further, the down counter 23 is loaded with the paper feed information by the signal cut command, and is counted down by the oscillation pulse of the oscillator 21 inputted to the town input terminal. Similarly, the counting control section 22 inputs the oscillation pulse from the oscillator 21 via the AND gate 31 and the OR gate 32, so that the paper 1 is fed out of the swing fin 8 by the rollers 4, 14 and 5, 15. It will now swing slower than the speed at which it is moving. When the end of the cut paper 1 reaches the tip of the swing fin 8, all outputs of the down counter 23 become a logical value of 0. As a result, the flip-flop 24 is reset via the OR gate 33 and the inverter 34, and the AND gate 31
is closed, and the oscillation pulse is no longer applied to the counting control section 22. When the flip-flop 24 is reset, its 0-side output becomes a logical value 1, which is applied to the initial state control section 25 via the differentiating circuit 29. Initial state control section 25
becomes operational when a signal of logical value 1 is applied from the differentiating circuit 29, and the counting control section 22 continues until it detects an encoder pulse indicating its initial position from the encoder 27 attached to the rotating shaft (not shown) of the motor 26. and amplifier 28
to the motor 26 via. As a result, the paper 1 is reliably folded to its end. In the above embodiment, the oscillation period of the oscillator 21 is fixed, but
The oscillation period from the oscillator 21 is made variable for each paper folding length based on the paper folding length information, and the swing fin 8 and the paper 1 By making the phase variable, it is possible to set the optimum phase for each sheet folding length, and it is possible to fold the trailing edge of the sheet accurately and reliably.

According to the present invention, since the paper can be folded accurately and reliably to the end thereof, the paper sheets of consecutive jobs can be stacked one after another, and the next paper can be easily processed in a feminine manner. There is.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of the paper folding device of the present invention, FIGS. 2 to 9 are side views illustrating paper end processing, and FIG. 10 is a block diagram showing a control circuit of the present invention. It is. In the figure, 1 is paper, 2 is a tractor, 3-5, 13-
15 is a roller, 6 and 16 are guides, 7 is a blade, 8 is a swing fin, 9 is a table, 21 is an oscillator, 22 is a counting control section, 23 is a down counter, 24 is a flip-flop, 25 is an initial state control section, 26 is a motor, 27 is an encoder, 28 is an amplifier, 29 is a differential circuit, 30,3
1 is an AND gate, and 32 and 33 are OR gates. Figure 1 Figure 2/Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A paper folding device comprising a swing fin that swings back and forth once every two pages of paper to fold the paper back and forth alternately, and a cutting means provided in front of the swing fin that cuts the paper, A paper folding device comprising means for generating a pseudo paper feed signal with a longer cycle than the paper feed signal, and after paper cutting, the swing fin is swung by the paper feed pseudo signal, and then the swing fin is swung to an initial position. Device.