JPH045478Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The invention is applicable to copying machines, facsimile machines, printers,
The present invention relates to a paper feeding device, such as a printing machine, equipped with a device for preventing paper dust from adhering to a paper feeding roller.

(Prior art) In a paper feeding device, the paper feeding tray loaded with transfer paper is kept horizontal and moved upward by a drive motor, and the topmost paper is pressed against the paper feeding roller.The paper feeding roller moves slightly up and down. I'm starting to get it.

In other words, when it hits the rising transfer paper, it moves upwards for cushioning and abuts against the uppermost paper with constant pressure (by its own weight), and the thickness of the transfer paper stack decreases as the paper is fed. When it arrives, it moves slightly downward due to its own weight. When movement to the lower limit of the predetermined movement range is detected, the drive motor is activated.
The paper feed tray is lifted upward again by the amount of paper that has been reduced.

When paper is fed by the paper feeding mechanism as described above, paper powder adheres to the surface of the paper feeding roller. If paper dust adheres to the paper, slips may occur between the paper feed roller and the paper, resulting in a delay in the timing of conveyance.

In particular, the delay is noticeable for paper with a smooth surface such as the second original drawing, and slippage may result in non-feeding.

In the past, in order to solve this problem, there have been systems that have been equipped with a rubbing mechanism that brings a brush into contact with the roller surface to remove the paper dust, but this conventional method has the disadvantage of poor collection of paper dust. It was hot.
In addition, there is a known technology in which a paper dust removal roller is provided with a paper dust removal roller that has a different circumferential speed at all times, but this has problems with the durability of the paper dust removal roller, and furthermore, the surface of the paper dust removal roller deteriorates over time. This method has the disadvantage that the roller becomes saturated with paper dust and the cleaning performance of the roller is reduced, making it unsuitable for copying machines that feed a large amount of transfer paper.

(Purpose) The present invention eliminates the drawbacks of the conventional example and prevents troubles caused by paper dust slip by removing paper dust on the surface of the paper feed roller using a simple mechanism, and also prevents paper dust from adhering. The object of the present invention is to provide a paper feeding device with excellent durability.

(Structure) In order to achieve the above-mentioned object, the present invention includes a paper feed roller that comes into contact with the paper stacked on the paper feed tray and whose surface is exposed when feeding the paper, and takes out the paper that comes into contact with the paper by frictional force caused by rotational motion; The paper dust collection member has a paper dust absorption roller that can rotate together with the paper feed roller, and a paper dust collection member having a mesh-like surface that collects paper dust on the surface of the paper dust absorption roller. Pressing the paper dust suction roller only during paper feeding operation, applying a rotational load to the paper feeding roller via the paper dust suction roller and the paper dust suction roller, and causing the paper dust suction roller to adsorb paper dust on the paper feeding roller; The paper dust collection member performs the paper dust collection operation of the paper dust suction roller at the same time.

The configuration of the present invention will be described below based on examples.

FIG. 1 is a simplified front view of a paper feeding device according to an embodiment of the present invention.

In the figure, a paper feed roller 1 and a conveyance roller 2 are supported at both ends by a pair of side plates 4. Reference numeral 3 denotes a separation roller that is pressed against the conveyance roller 2 by a spring (not shown). Transfer paper on a paper feed tray 8 fed by a paper feed roller 1 is separated one by one by a conveyance roller 2 and a separation roller 3.

Also, the stay members 6 in both side plates 4 are closer to the fixing members 5.
A coil spring 7 is applied to the side plate 4 so as to apply a counterclockwise biasing force to the side plate 4 around the rotation support shaft 15 of the conveyance roller 2 . The paper feed roller 1 is therefore likewise urged downwards and comes into contact with the uppermost paper with a predetermined pressure.

When the transfer paper is loaded on the paper feed tray 8, the paper feed operation is started by the drive of the paper feed tray motor (not shown), and the paper feed tray 8 rises, but the side plate 4 near the paper feed roller 1 The attached shutter plate 9 also rises as the paper feed tray 8 rises. When the detection device 10 attached to the fixed member 5 detects that it has risen to a predetermined position,
The motor stops driving and the paper feed tray 8 stops. At this time, the paper feed roller 1 is pressed against the transfer paper by the coil spring 7. When a paper feed signal is input, drive is transmitted from the outside to the paper feed roller 1, and the paper feed roller 1 rotates in the direction of the arrow to feed paper. Each time paper is fed, the position of the paper feed roller 1 is lowered by the thickness of the paper, and when 15 to 20 sheets of paper have been fed, the shutter plate 9 moves to the detection device 10.
is set to turn off. When turned off, the paper feed tray 8 rises again.

Then, as mentioned above, the uppermost paper feeds the paper feed roller 1.
is moved slightly upward, and as a result, the side plate 4 is also moved upward, causing the shutter plate 9 to rise, which is detected by the detection device 10, and the drive is stopped using this detection signal. be.

Note that the paper feed roller 1 descends approximately 1.5 mm and then rises. In other words, it oscillates with a width of 1.5 mm.

In the paper feeder having such a configuration, the present invention is provided with a paper powder suction roller 11 and a paper powder collection member 13.

The paper powder adsorption roller 11 is configured to be able to swing around a rotational support shaft 15 by an arm member 12, and is brought into contact with the paper feed roller 1 under its own weight. As the paper feed roller 1 rotates, it rotates with the rotation of the paper feed roller 1. Furthermore, the collection member 13 is attached to the cover 14 of the fixed member 5, making it easy to replace. This collection member 13 is adapted to come into contact with the paper powder suction roller 11 when it is located above. Collection member 13 and paper powder adsorption roller 11
When they are in contact with each other, a rotational load is applied between them, and the circumferential speed of the paper powder suction roller 11 becomes slower than the circumferential speed of the paper feed roller 1 or stops. Therefore, paper dust on the surface of the paper feed roller 1 tends to adhere to the paper dust suction roller, and paper dust adhered to the paper dust suction roller 11 tends to adhere to the collection member 13.

When the paper feed roller 1 descends as the paper feeding operation is stopped, the paper dust suction roller 11 separates from the collection member 13, so that the paper dust suction roller rotates together with the paper feed roller.

It is preferable to use a foamed polyurethane roller as the paper powder adsorption roller and a foamed polyurethane mat as the collection member. If cleaning is performed intermittently as described above, durability will be improved.

If the mesh of the collecting member is made finer than the foamed polyurethane mesh of the paper dust absorbing roller 11, the efficiency of cleaning the surface of the paper dust absorbing roller 11 by the collecting member 13 will be further improved, and the collection performance will be improved.

FIG. 2a shows a state in which the paper powder suction roller 11 and the collection member are in contact, and FIG. 2b shows a state in which they are separated.

(Effects) The present invention is as described above, and according to the present invention, the paper dust collecting member comes into pressure contact with the paper dust suction roller only during paper feeding operation, and rotates between the paper dust suction roller and the paper feeding roller. By applying a load, the paper dust suction roller performs the paper dust suction operation of the paper feed roller and the paper dust collection member performs the paper dust collection operation of the paper dust suction roller at the same time. By collecting the powder with the paper dust collection member, it is possible to prevent the paper dust absorption capacity of the paper dust absorption roller from decreasing over a long period of time, and also to make the paper dust absorption roller and the paper dust collection member operate most efficiently. Since the wear of the paper dust suction roller and the paper dust collection member can be reduced as much as possible, it is possible to provide a paper feeding device that has excellent durability and economical efficiency and can be miniaturized as a whole.

In addition, when feeding paper, the paper stacked on the raised paper feed tray comes into pressure contact with the paper feed roller, which causes the support members that rotatably support the paper feed roller and the paper dust absorption roller to rotate, and the paper dust If the suction roller is brought into pressure contact with the paper dust collecting member, a paper feeding device having the above effects can be provided with an extremely simple mechanism.

Furthermore, if the paper dust collection member is attached to a cover that covers the opening of the fixed member disposed above the paper feed roller, it becomes easy to replace the paper dust collection member soiled with collected paper dust.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a paper feeding device according to an embodiment of the present invention, FIG. FIG. DESCRIPTION OF SYMBOLS 1...Paper feed roller, 4...Side plate, 11...Paper powder adsorption roller, 13...Recovery member, 15...Rotation shaft.

Claims (1)

[Claims for Utility Model Registration] (1) A paper feed tray on which sheets of paper are stacked, and a paper feed tray that, when feeding paper, comes into contact with the exposed surface of the paper stacked on the paper feed tray and is caused by rotational movement. In a paper feeding device equipped with a paper feeding roller that takes out paper that comes into contact with the paper by frictional force, a paper dust suction roller that can rotate together with the paper dust suction roller in contact with the paper dust suction roller and paper dust on the surface of the paper dust suction roller are collected. , has a paper dust collection member with a mesh-like surface, the paper dust collection member presses against the paper dust absorption roller only during paper feeding operation, and collects the paper dust through the paper dust absorption roller and the paper dust absorption roller. A rotational load is applied to the paper feed roller so that the paper powder suction roller performs the paper powder adsorption operation of the paper feed roller and the paper powder collection member performs the paper powder collection operation of the paper powder adsorption roller at the same time. A paper feeding device featuring: (2) It has a support member that rotatably supports a paper feed roller and a paper powder suction roller, and is rotatable around a rotation axis, and when paper is fed, the paper is stacked on the raised paper feed tray. 2. The paper feeding device according to claim 1, wherein the support member is rotated by pressure contact between the paper and the paper feed roller, and the paper dust suction roller is brought into pressure contact with a paper dust collecting member. (3) a fixing member disposed above the paper feed roller;
3. The paper feeding device according to claim 2, further comprising a cover removably attached to cover the opening of the fixing member, and a paper dust collecting member is attached to the cover.