JPS61248859A - Roller device for paper folding machine - Google Patents

Abstract

PURPOSE:To sharpen the crease of a sheet of paper without making the whole device larger by movably providing a press roller within a pinch roller, being directed to a driving roller. CONSTITUTION:When a solenoid 14 is not being excited, an arm 10 is swung upward up to hit against a stopper 13 by means of a spring 12, a press roller 7 is separated from the inner surface of a pinch roller 3, causing the nipping pressure between a driving roller 2 and the nipping part 15 of the pinch roller 3 to be very weak, and, thereby, a very large force is not applied to a sheet of paper which passes through the nipping part. When the solenoid 14 is excited swinging the arm 10 downward against the spring 12, the press roller 7 is pressed against the inner periphery of the pinch roller 3 to increase the nipping pressure between the pinch roller 3 and the driving roller 2, thereby, sharpening the crease of a sheet of paper when folding said paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roll device for a paper stapler for folding paper.

As disclosed in Japanese Patent Publication No. 49-44416, there is known an apparatus that folds a sheet by pressing a pair of blades into contact with each other and passing the sheet through the nip portion.

Problems to be Solved by the Invention Since the paper is creased by the pressure between a pair of rollers, that is, the nip pressure, it is necessary to increase the nip pressure in order to strengthen the creases in the paper.

However, due to the mechanical properties of the four rollers themselves, the nip pressure cannot be increased beyond a certain limit determined by the roller diameter.

For this purpose, the roller diameter is increased to improve cutting performance, which increases the nip pressure and strengthens the folds in the paper.
If you do this, the diameter of the rollers will increase, making the entire device heavier and larger, and when the paper is nipped, the rollers will deform due to the thickness of the paper, and this deformation will cause a large amount of force (damage, stress) on the paper. ), which causes wrinkles in the paper and prevents it from being conveyed smoothly, making it virtually impossible to use it as a normal conveyance device without folding the paper.

A pressure roller is provided inside a cylindrical pinch roller that is in pressure contact with the drive reeler so as to be movable toward the drive roller, and this pressure roller t-X moving roller Provide a mechanism to move toward
By moving the pressure roller, the nip pressure at the nip portion between the drive roller and the pinch roller can be increased or decreased.

Embodiment A driving cape roller 2 and a pinch roller 3 are rotatably supported horizontally between a pair of frames 1.1, and the pinch roller 3 is cylindrical and fixed to the frame 1 via an elastic body 4. It is rotatably supported on the outer peripheral surface of the bracket 5 via a bearing 6, and a pressure roller 7 is provided inside the bracket 5. Both ends of the support shaft 8 of the pressure roller 7 are connected to the hole 5α of the bracket 5 and the frame. 1 protrudes outward υ from the opening 9 of the frame 1, and is supported by one end of each arm 10.
The spring 12 swings upwardly until it hits a stopper 13, and the solenoid 14 swings downwardly.

A paper guide 16 is provided on the entrance side of the nip portion 15 between the drive roller 2 and the pinch roller 3, and a discharge guide 17 is provided on the exit side. The leading edge of the loaded paper comes into contact with the stopper 19, and the middle part curves into a loop shape and protrudes toward the nip section 15. When passing through the nip section 15, the paper is folded and ejected from the ejection guide 17. .

Therefore, when the solenoid 14 is de-energized, the arm 10
is swung upward by the spring 12 until it hits the stopper 13,
Since the pressure roller 7 is separated from the inner peripheral surface of the pinch roller 3, the nip pressure at the nip portion 15 between the drive roller 2 and the pinch roller 3 becomes extremely weak, and a large force ( Since the paper can be smoothly fed without causing wrinkles (damage or stress), it can be used as a paper conveyance device without folding the paper.

Also, the solenoid 14 is energized and the arm 10
2. When the pressure roller swings downward against the
The pinch roller 3 is pressed against the inner peripheral surface of the roller 3, and the nip pressure between the pinch roller 3 and the drive roller 2 can be increased, and the crease of the paper can be strengthened when folding the paper.

At this time, the pinch ruler 3 is held between the drive roller 2 and the pressurizing roller 2, and no force is applied to crush the entire pinch roller 3 in the radial direction, so the entire pinch roller 3 is pushed down and pressure is applied to the drive roller 2. Pinch view compared to the case
It is necessary to increase the rigidity of the pinch roller 3, and since the pinch roller 3° is cylindrical, even if the nip pressure of the nip portion 15 is sufficiently increased, the diameter of the pinch roller 3 needs to be slightly increased. There is no weight, and the weight is not too heavy.

Therefore, the folds of the paper can be strengthened, and the entire apparatus can be made lighter and smaller.

Note that if the solenoid 14 is energized only when the folded portion of the paper passes through the nip 15, the nip pressure is increased only when folding the paper, and the ninth fold is strongly pressed.
At other times, the paper can be conveyed smoothly without applying a large force to the paper.

In the above embodiment, the arm 1o, the spring 12, and the solenoid 1
4, the pressure roller 7t is moved up and down, but the pressure roller 7't may be moved up and down directly by the solenoid 14, or the arm 1o is vertically swung by a cam to move the pressure roller 7t up and down. You may move it up or down.

In other words, it is possible to provide a mechanism for moving the pressure roller 7 toward the drive roller 2.

Effects of the Invention By pressing the pinch roller 3 against the drive roller 2 using the pressure roller ruff, the nip pressure at the nip portion 15 can be increased, which makes it possible to strongly suppress creases in the paper, and also makes the entire device heavy and dust-free. It will never change.

By separating the pressure t-rough from the inner peripheral surface of the pinch roller 3, the nip pressure at the nip portion 15 can be reduced, so the paper can be conveyed smoothly without wrinkles, and the paper can be conveyed normally without folding. It can also be used as a transport device.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is similar to 1-1 in FIG.
2 is a sectional view taken along the line ■--■ in FIG. 1. 21'tl[IO-ra, 3 is a pinch roller, 7 is a pressure roller.

Claims (1)

[Claims] A device in which a drive roller 2 and a cylindrical pinch roller 3 are brought into pressure contact and paper is folded by passing the paper through the nip portion 15, in which a pressure roller 7 can be moved within the pinch roller 3 toward the drive roller 2. This pressure roller 7
1. A roller device for a paper folding machine, characterized in that a mechanism for moving the roller device is provided.