JPS5934614B2 - 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 the printing device must be stopped when such ejection occurs, which reduces the operating rate of the printing device. There was a problem.

For this reason, it has been proposed to stop discharging the paper after each job and stack the paper one after another, but the next folding will not be possible unless the trailing edge of the cut paper is folded accurately and reliably.

It is an object of the present invention 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 end of the paper is in the swing fin, the end of the paper is reliably folded if the swing fin is quickly returned to the initial position, and the present invention detects when the end of the paper reaches the swing fin and swings the end of the paper into the swing fin. This is characterized in that the fins are returned to their initial positions.

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

Continuous printing paper 1 discharged from a printing device (not shown) is sent by a tractor 2, and a pair of upper and lower rollers 3, (1
3), 4, (14), 5, (15) and 6, (16) are guided to the swing fins 8, folded alternately from front to back by the swing fins 8, and deposited on the table 10. . Note that 9 is a small roller attached to the lower end of the swing fin 8 in order to make the trailing edge of the sheet of paper 1 well exposed, and 11 is a guide. It is assumed that the rollers 3, (13) feed the paper 1 at the same speed as the tractor 2, and the rollers 4, (13) feed the paper 1 at the same speed as the tractor 2.
(14), 5, (15) and 6, (16) are rollers 3,
(Assume that the paper 1 is fed at approximately twice the speed of 13 oki.The roller 14 is normally positioned upward as shown by the broken line, and when a cutting command, that is, a signal cut command, which will be described later, is generated, it descends as shown by the solid line.) .Roller 14 descends and paper 1
When the paper 1 comes into contact with the roller 4 through the roller 4, a large tension is applied to the paper 1 between them due to the speed difference between the rollers 3, (13) and 4, (14>0), and the paper 1 is cut by the brake 7. The cut paper 1 is transferred to rollers 4, (14 pieces 5, (
15) and 6 and (16), it is sent at about twice the speed as described above. As is well known, the swing fin 8 is
Every time two pages of paper 1 are fed, the paper 1 is oscillated back and forth once, and the oscillation speed is the same as the paper feeding speed of roller 3 (13) before cutting and the paper feeding speed of roller 4 (14) after cutting. The control circuit is controlled in a corresponding manner, and will be explained below with reference to FIG. 2, which shows 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 indicates the length of one page of the paper 1, the paper feed information indicates the distance between the blade 7 and the swing fin 8, and the signal cut command indicates when the fold to be cut is located on the blade 7. This is a logic 1 pulse that is generated. Reference numeral 21 denotes an oscillator that oscillates pulses with a period corresponding to the paper feeding speed of the rollers 4, (14), etc.

The counting control unit 22 drives a swing fin driving motor 26 via an amplifier 28 so that the swing fin 8 swings back and forth once every two pages of paper 1 is fed, and the counting control unit 22 drives a swing fin driving motor 26 via an amplifier 28 so that the swing fin 8 swings back and forth once every two pages of paper 1 are fed. is input, and before and after cutting the paper, a pulse is generated every time a predetermined number of paper feed signals and oscillation pulses from the oscillator 21 are input. When the signal cut command is generated, the flip-flop 24 is set, and its O-side output closes the AND gate 30 and prohibits 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 in response to the signal cut command, and is counted down by the oscillation pulse of the oscillator 21 inputted to the down input terminal. At this time, the counting control section 22 controls the AND gate 3
1 and the OR gate 32, the swing fin 8 is swung at about twice the speed. When the end of the cut paper 1 reaches the swing fin 8, all output terminals of the down counter 23 have 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 transmitted to the counting controller 22.
can no longer be added to. When the flip-flop 24 is set, its O side output becomes a logical value 1, and the differential circuit 29
It is applied to the initial prone state control section 25 via.

The initial state control section 25 becomes operational when a signal of logical value 1 is applied from the differentiating circuit 29, and converts the encoder pulse from the encoder 27 attached to the not-illustrated rotating shaft of the motor 26 into an encoder pulse indicating the initial position. is applied to the motor 26 via the counting control section 22 and the amplifier 28 until it is detected. Therefore, the swing fin 8 is quickly returned to its initial position. As a result, paper 1
is guaranteed to be folded to its end. In the above embodiment, the paper feed signal after cutting the paper is generated in a pseudo manner using the oscillator 21; , this encoder pulse may be used instead.

Also, as a method of cutting the paper 1, the roller 3, (13)
and 4, (14) and (7) Although tension is applied by the speed difference and the blade 7 is used for cutting, the cutting may be performed using, for example, a general Sure, rotary cutter, or the like.

As described above, according to the present invention, sheets can be folded accurately and reliably to the end of the sheet, so sheets of continuous jobs can be stacked one after another, and the starting edge of the next sheet can be easily processed. There is.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view showing a schematic configuration, and FIG. 2 is a block diagram showing a control circuit. In the figure, 1 is paper, 2 is a tractor, 3-6, 13-
16 is a roller, 7 is a blade, 8 is a swing fin, 9
10 is a small roller, 10 is a table, 11 is a guide, 21 is an oscillator, 22 is a counting control section, 23 is a down counter, 24
25 is a flip-flop, 25 is an initial state control unit, 26 is a motor for driving the swing fin 1, 27 is an encoder, 28
is an amplifier, 29 is a differential circuit, 30 and 31 are AND gates, 32 and 33 are OR gates, and 34 is an inverter.

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, Distance information indicating the distance between the cutting means and the swing fin and a paper feed signal after cutting are input, and the paper feed signal is added and compared with the distance information to determine that the end of the cut paper has reached the swing fin. and an initial position control means that receives position information indicating the position of the swing fin and generates a signal to drive the swing fin drive motor until the initial position of the swing fin is detected, A paper folding device characterized in that an initial position control means is operated in response to a detection signal from the arrival detection means to rapidly return the swing fin to an initial position.