JPS5934615B2 - 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 folded and stacked on the table is ejected every time a job is completed, but since it is necessary to stop the printing device at the time of such ejection, there is a problem that the operating rate of the printing device decreases. It was hot.

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 flaws.

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 leading edge of the next sheet guides the trailing edge of the previous sheet, the trailing edge of the sheet is reliably folded. It is characterized in that the leading edge of the paper is guided by swing fins.

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

In FIG. 1, a continuous printing paper 1 is discharged from a printing device (not shown) and is sent by a tractor 2, and guided to a swing fin 8 through a pair of rollers 3, 13, 4, 14 and 5, 15, respectively. The sheets are then folded alternately, front and back, by the swing fins 8 and deposited on the table 9. 6,
16 is a guide.

The rollers 3 and 13 feed the paper 1 at the same speed as the tractor 2, and the rollers 4 and 14 and the rollers 5 and 15 feed the paper 1 at a slightly faster speed than the rollers 3 and 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 signal falls as shown by the solid line. When the roller 14 descends and comes into contact with the roller 4 through the paper 1, the rollers 3, 1
Due to the speed difference between rollers 3 and rollers 4 and 14, tension is applied to 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. The swing fin 8 swings back and forth once every two pages of the well-known starting paper 1, 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. FIGS. 2 to 9 are diagrams showing the swing fin 8 and the paper 1 during end processing. Conventional end processing is as shown in Figures 2 to 5. Especially for papers with short folding length and large ream weight, the last page of paper 1 sticks out as shown in Figure 5. , it is not possible to reliably fold the end of the paper 1.

6 to 9 are diagrams showing the operation of the swing fin 8 and paper 1 according to the present invention. In the state shown in FIG. 6, the swing fin 8 is temporarily stopped, and then the leading edge of the paper 1 to be folded is
By feeding out the amount that comes out from the tip of the swing fin 8 and then swinging the swing fin in the directions shown in FIGS. 7 to 9, the protruding end of the sheet 1 can be folded up reliably.

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. A pulse of 1, a paper feed request signal, is a signal that temporarily stops the swing fin 8 and requests paper feed by the amount by which the leading edge of the paper 1 to be folded next comes out from the leading edge of the swing fin 8. Reference numeral 21 is an oscillator that generates pulses corresponding to the paper feeding of the rollers 4, 14 and 5, 15.

The counting control unit 22 drives the swing fin driving motor 26 once via the amplifier 28 so that the swing fin 8 makes one reciprocation every time two pages of the paper 1 are fed, and the counting control unit 22 drives the swing fin drive motor 26 once through the amplifier 28. The input is a paper feed signal before the paper is cut, and after the paper is cut, a pulse is generated every time a predetermined number of oscillation pulses from the oscillator 21 are applied. When the signal cut command is generated, the flip-flop 25 is set, and its O side output closes the AND gate 30, and the paper feed signal is sent to the counting control section 22.
prohibited from being added to.

Further, the paper feed information is loaded into the down counter 24 by the signal cut command, and the down counter 24 is counted down by the oscillation pulse of the oscillator 21 inputted to the down input terminal. At the same time, the counting control section 22 receives the oscillation pulse as input through the AND gate 31 and the OR gate 33, so that the swing fin 8 corresponds to the speed at which the paper 1 is fed out from the rollers 4, 14 and 5, 15. It will now swing at the same speed. When the end of the cut sheet 1 reaches the tip of the swing fin 8, all outputs of the down counter 24 become a logical value of 0.

As a result, the AND gate 31 is closed and the oscillation pulse is no longer applied to the counting control section 22. At the same time, the temporary stop control section 3
Added to 6. The temporary stop control unit 36 becomes operational when a signal of logical value 1 is applied from the differentiating circuit 29, and the encoder 2 attached to the rotation shaft (not shown) of the motor 26 is activated.
7, the temporary stop position is applied to the motor 26 via the counting controller 22 and the amplifier 28 until an encoder pulse is detected. On the other hand, the temporary stop control section 36 sends out the paper feed request signal after detecting the temporary stop position. When the paper feed signal is generated in this state, the AND gate 3
2, the paper feed amount is counted by a counting control section 23.
When the count reaches a predetermined value, the counting control section 23 requests the temporary stop control section 36 to stop the paper feed request signal, and at the same time resets the flip-flop 25. At the same time, the initial state control section 37 receives a signal from the counting control section 23 and becomes operational. Add to motor 26. This binding paper 1 is folded securely to its end. In the above embodiment, the swing fin 8 is temporarily stopped at the position shown in FIG. 6, and after feeding the paper 1, the swing fin 8 is swung from FIG. 7 to FIG. 9. According to the present invention, it is also possible to send the next sheet 1 while swinging the swing fin 8 so that the relationship shown in FIGS. 6 to 9 is achieved without temporarily stopping at the position shown in FIG. 6. Since the sheets can be folded accurately and reliably to the end, sheets of successive jobs can be stacked one after another, and the starting edge of the next sheet can be easily processed.

[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 the 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,
23 is a counting control section, 24 is a down counter, 25 is a flip-flop, 26 is a motor, 27 is an encoder, 28
29 is an amplifier, 30 to 32 are AND gates, 33 and 34 are OR gates, 35 is an inverter, 36 is a temporary stop control section, and 37 is an initial state control section.

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 alternately from front to back, and a cutting means provided in front of the swing fin to cut the paper, A means for generating a pseudo paper feed signal corresponding to the paper feed signal after cutting is provided, the swing fin is swung by the paper feed pseudo signal, and then the starting end of the next paper is brought out from the tip of the swing fin, and the swing A paper folding device characterized by swinging fins to an initial position.