JPS628380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper conveyance attitude control device in a copying machine or the like.

(Prior Art) Conventionally, in a copying machine, etc., when paper is conveyed at high speed through a paper conveyance path arranged inside the machine, when the conveyance means changes, that is, when the conveyance means is stopped or the conveyance speed is changed, the corresponding If the conveyance speed of the paper is not controlled to a speed suitable for transfer immediately before the transfer, there is a high possibility of overrun and damage when stopping or changing the conveyance speed, causing problems such as paper jams. Therefore, conventionally, just before the point where the conveyance means changes, for example, in the case of a registration device as shown in FIG. Place 2′,
By causing the paper to slip when passing between the rolls 2 and 2', the conveyance force is controlled to be appropriate for transfer, thereby preventing damage to the paper.

However, such paper damage prevention means can be used at high speeds, even if the nip force between the rolls 2 and 2' is the minimum that allows the paper to be transported without slipping, such as tracing paper, etc. However, when conveying thin paper, damage to the paper cannot be avoided.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the above-mentioned paper conveyance posture control means, and provides a pair of upper and lower nips disposed in front of a paper conveyance posture correction device such as the registration gate. Instead of a weak roll, an endless rotating belt is placed horizontally along the conveyance direction using a pulley at the bottom of the area, and a magnetic paper guide is provided at the top of the belt. An electromagnet is placed between the pulleys of the belt, and a light source and a photo sensor are placed at appropriate locations on the conveyance path before the paper entrance of the conveyor belt. A photo sensor detects the amount of transmission, sends the signal to the central processing unit (CPU), compares it with a preset reference value, and sends a signal corresponding to the difference to the electromagnet to guide the paper. By freely controlling the strength of the adsorption force on the conveyor belt, the paper guide and the conveyor belt can
The conveyance force of the paper transferred to the next conveyance means is
It is an object of the present invention to provide a paper conveyance attitude control device which can appropriately control the paper to prevent damage or the like from occurring just before the paper reaches the next transfer means in any case of thin paper.

(Structure of the Invention) The present invention will be described in detail below, taking as an example a case where the invention is disposed in front of a registration device of a copying machine shown in the drawings.

FIG. 2 is a schematic configuration diagram showing an embodiment of the paper conveyance posture control device of the present invention.

An endless rotary conveyor belt 4 is installed along the conveyance direction under the conveyance path in front of a registration gate 3, which serves as a conveyance posture correction device provided in the paper conveyance path of the copying machine, using pulleys 4 and 4'. Place it horizontally. A magnetic paper guide 6 with a paper input/output section curved upward is placed on top of the transport belt 4, and the paper is nipped between the magnetic paper guide 6 and the transport belt 4. The paper is conveyed in the direction of the registration gate 3 by the rotation of the conveyor belt 4, and an electromagnet 7 is arranged between the pulleys 5 and 5' of the conveyor belt 4 for the magnetic paper guide 6. However, the electromagnet 7 attracts the magnetic paper guide 6 onto the conveyor belt 4 to strengthen the nipping force on the paper, thereby increasing the conveyance force. In order to operate the electromagnet 7, a light source 8 and a photo sensor 9 are placed at appropriate locations on the conveyance path in front of the paper entrance between the conveyor belt 4 and the magnetic paper guide 6. A central processing unit (CPU) 1 measures the amount of light transmitted through a photo sensor 9.
0, and then compares it with a preset reference value, and sends a signal to the electromagnet 7 according to the difference. The intermediate processing device 10 is also connected to a drive mechanism (not shown) for the registration gate 3, and at the same time it issues an opening signal for the gate 3, it operates the electromagnet 7 to move the magnetic paper guide 6. It is also made so that it can be adsorbed onto the conveyor belt 4.

The present invention is constructed as described above. Next, its operation will be explained.

It is now assumed that the paper 11 has been transported from the right to the left in the figure by the transport rolls 12, 12'.
When the paper 11 passes through the position where the light source 8 and photo sensor 9 are arranged, the central processing unit 10 compares the thickness of the paper 11 with a reference setting value and determines the thickness of the paper 11 based on the amount of light transmitted. When it is determined that the thickness of the paper 11 is thicker than the standard setting value,
Send a signal to that effect to electromagnet 7 and turn on electromagnet 7.
Then, the magnetic paper guide 6 is attracted onto the conveyor belt 4 to strengthen the nipping force on the paper 11 at that location, and the paper 11 is conveyed to the registration gate 3 with a strong conveyance force. However, when it is determined that the paper is thinner than or equal to the reference setting value, the electromagnet 7 does not operate, and the paper 11 receives a weak nipping force due to the self-weight of the magnetic paper guide 6.
In other words, the thin paper 11 can be transported without any problem,
Moreover, the paper is transported with such a transport force that no damage occurs when the paper 11 hits the registration gate 3. When the paper 11 hits the registration gate 3, if the paper is thick paper, the electromagnet 7 is turned off and the nipping force against the paper 11 is reduced to just the weight of the magnetic paper guide 6. Alternatively, the electromagnet may remain in the ON state. This determination is made by the central processing unit 10 based on the amount of light transmitted at the positions of the light source 8 and photo sensor 9. When the central processing unit 10 issues a gate opening signal to the drive mechanism (not shown) of the registration gate 3 to open the registration gate 3, the central processing unit 10 also sends a signal to the electromagnetic coil 7. is activated to attract the magnetic paper guide 6 onto the conveyor belt 4, nip the rear of the paper 11, and transfer it to the conveyor rolls 13, 13'. When the registration gate 3 opens, the electromagnet 7 is operated and the magnetic paper guide 6 is attracted onto the conveyor belt 4 in the same manner when the paper 11 is thin paper. transport.

(Effects of the Invention) As described above, the present invention allows the paper transport speed to be adjusted immediately before the paper being transported is temporarily stopped or transferred to a transport means with a different speed in the paper transport path of a copying machine or the like. Since the speed can be adjusted to correspond to the thickness, damage to the paper during the temporary stop or transfer can be significantly reduced, regardless of the high-speed conveyance machine or the thickness of the paper.

Therefore, the occurrence of paper jams due to the paper damage is reduced, which helps improve the reliability of machines such as copying machines.

It should be noted that there is no reason why the present invention should be limited to the above-mentioned embodiments. For example, the magnetic paper guide 6 may be a chute, and the entire guide need not be made of a magnetic material, but may be made of an electromagnetic material. It goes without saying that a magnetic plate or the like may be attached only to the suction portion of the solenoid 7.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a registration device in a conventional copying machine, and FIG. 2 is a schematic configuration diagram showing an embodiment of the paper conveyance attitude control device of the present invention. In the figure, 4... conveyor belt, 5, 5'... pulley, 6... paper guide, 7... electromagnet, 8... light source, 9... photo sensor, 10... central processing unit.

Claims (1)

[Claims] 1. In the paper conveyance path of a copying machine, etc., an endlessly rotating conveyor belt is placed horizontally along the conveyance direction using a pulley, etc. at a suitable location below the paper conveyance posture correction device such as a registration gate. death,
A magnetic paper guide is placed on top of the belt so that the paper is nipped and transported between the magnetic paper guide and the conveyor belt, and the magnetic paper guide is connected to the pulley of the conveyor belt. An electromagnet is placed between them so that when the electromagnet is energized, it can be attracted onto the conveyor belt, and a light source and a photo sensor are placed at appropriate locations on the paper conveyance path in front of the paper entrance of the conveyor belt and the magnetic paper guide. By arranging a sensor and connecting the photo sensor and the electromagnet to a central processing unit, the thickness of the paper conveyed through the paper conveyance path can be determined by the amount of light that passes between the light source and the photo sensor. The amount of transmission is detected, and the attraction force of the electromagnet is controlled by the central processing unit based on the signal, so that the force of conveying the paper by the conveyor belt and the magnetic paper guide is changed depending on the thickness of the paper. A paper conveyance force control device characterized by: