JPS6047177B2 - paper folding device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a method for folding continuous printing paper alternately front and back.
The present invention relates to a paper folding device having a cutting means for cutting each paper sheet.

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 swing fin is operated faster than the normal speed when processing the end of paper, the end of the paper is reliably folded. The swing fin is characterized in that the swing fin is operated faster than the normal speed until the target is reached.

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

In FIG. 1, continuous printing paper 1 is 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, 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 at a slightly faster speed than the rollers 3 and 13 so that the paper 1 does not slacken in the middle. Suppose we send 1. It is assumed that the roller 14 is normally positioned upward as shown by the broken line, and moves downward as shown by the solid line when a cutting command, ie, a signal cut command, which will be described later, is generated. When the roller 14 descends and contacts the roller 4 through the paper 1, the rollers 3, 13 and the rollers 4, 1
Due to the speed difference between paper 1 and paper 4, tension is applied to paper 1 between them. Thereafter, the paper 1 is cut by lowering the blade 7. The cut paper 1 is transferred to the rollers 4 and 14
and is sent in the direction of the swing fin 8 by the rollers 5 and 15. As is well known, the swing fin 8 swings back and forth once when the paper 1 is fed two pages, and the swinging speed is the same as the paper feeding speed of the rollers 3 and 13 before cutting, and the paper feeding speed of the rollers 4 and 14 etc. after cutting. It is controlled according to the speed.
2 to 4, the swing fin 8 is operated at the same speed as the rollers 4, 14, 5, and 15 during the termination process. Paper 1. When the end of the paper 1 comes off the rollers 5 and 15, the weight of the paper 1 causes the paper 1 to move closer to the table 9 than usual.
The end of the sheet 1 cannot be reliably folded as shown in FIG. Figures 5 to 7 show the speed of the swing fin 8 at the time of the end processing of the rollers 4, 14, 5, 15.
There is a mechanism that operates faster and can reliably fold the end of the paper 1. Swing fin 8 in this case
The speed of the paper 1 is determined by taking into account the movement of the paper 1 after the end of the paper 1 is removed from the rollers 5 and 15. The control circuit will be explained below with reference to FIG. 8 showing the control circuit.

The paper feed signal is a pulse generated each time the paper 1 is fed to a single position, and is generated, for example, from an encoder attached to a drive shaft (not shown) of the tractor 2. The paper feed information is information indicating the distance between the blade 7 and the swing fin 8, the paper folding information is information indicating the length of one page of the paper 1, and the signal cut command is generated when the crease to be cut is located on the blade 7. This is a logic 1 pulse. 21 is the roller 4, 14, 5, 1
This is an oscillator that generates pulses with a shorter cycle than the cycle corresponding to the paper feed speed of 5.

The counting control unit 22 drives the swing fin drive motor 26 via the amplifier 28 so that the swing fin 8 swings back and forth once every two pages of the paper 1 is fed. It is used as an input, and an output is generated every time a predetermined number of paper feed signals and oscillation pulses from the oscillator 21 are input before and after cutting the paper. When the signal cut command is generated, the flip-flop 24 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.

In addition, 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 down input terminal. 32, the swing fin 8 is connected to the rollers 4, 14,
5 and 15, the paper is swung faster than the speed at which it is fed out. 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 reset, its 0 side output becomes a logical value 1, and the differentiating circuit 29
It is added to the initial 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 detected and applied to the motor 26 via the counting control section 22 and amplifier 28. As a result, the paper 1 is reliably folded to its end. According to the present invention, since the paper can be folded accurately and reliably to the end, it is possible to stack the papers of consecutive jobs one after another, and
This has the effect of making it easier to process the starting edge of the next sheet.

[Brief explanation of drawings]

FIG. 1 is a side view showing a schematic configuration of a paper folding device according to the present invention, FIGS. 2 to 7 are side views showing paper end processing, and FIG. 8 is a block diagram showing a control circuit thereof. 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.

Claims (1)

[Claims] 1. A swing fin that swings back and forth once every two pages of paper to fold the paper back and forth alternately, a cutting means provided in front of the swing fin to cut the paper, and a combination of the cutting means and the swing fin. A paper folding device is provided substantially above a swing fin between the paper folding devices and has a paper feed roller, the paper folding device having means for generating a pseudo paper feed signal having a cycle shorter than a cycle corresponding to the paper feed speed of the roller, and means for validating the pseudo paper feed signal only from the time of occurrence until the end of the cut paper reaches the swing fin, and the pseudo paper feed signal causes the swing fin to be activated until the end of the paper reaches the swing fin. A paper folding device characterized by being driven at a speed faster than the feed speed at the end of the paper.