JPS5882931A - Paper feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feed device for an image forming machine, and particularly to a paper feed device having a cleaning function for a rotary paper feed member that feeds out sheets.

For example, a photo camera is equipped with a paper feeding device for picking up a sheet of paper to be transferred from a paper feeding cassette and feeding it to a destination position. For example, a paper feeder that feeds sheets one by one by bringing a paper feed roller into contact with the topmost sheet of paper placed in a paper feed cassette and rotating this paper feed roller. It is well known that this method is mainly used.

In the above paper feeding system, the uppermost sheet of paper is sequentially separated and sent to the destination position by the rotating action of the paper feeding roller and the separating action by appropriate means such as a corner separator. In such cases, the sheet of paper is fed out by the frictional action between the paper feed roller and the sheet of paper in contact with it. Therefore, in the method of feeding sheet paper using friction, conditions such as the smoothness of the chest surface of the paper feed roller, the coefficient of friction, and the distribution of dust ensure that the timing is set for each sheet of paper one by one. This has a big impact on the speed at which it is delivered. Particularly dust such as toner and paper powder.
Predicting success is very difficult.

By the way, the cleaning device for the paper feed roller of the paper feed device was developed in Japanese Unexamined Patent Application Publication No. 4
It is described in No. 55741 of 1988 and #f Kai No. 106130 of 1972. In any of the conventional devices, the paper feed motor is cleaned by bringing a cleaning member into contact with the circumferential surface of the paper feed roller and sliding the cleaning member.

FIG. 1 shows an embodiment of this conventional paper feed roller cleaning device. l is the paper feed roller.

2 is a sheet of paper, 3 is a cleaning belt, and 4.4' is a pulley 15 is a motor. The paper feed roller 1 is in contact with the uppermost position sheet F, and this paper feed roller 1 rotates to feed out the sheet paper.

There are both boos on the top of the paper feed roller! A cleaning belt 3 stretched between J-4 and J-4' is in contact with each other.

This cleaning belt 3 is rotated by a motor 5 to rub and clean the paper feed roller.

However, such conventional devices have complicated structures, are expensive, and require difficult maintenance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple, reliable, and inexpensive paper feeding device that has a function of cleaning the surface of a rotating paper feeding member and maintaining a smooth and reliable paper feeding operation.

The present invention provides a paper feeding device having a rotating paper feeding member that feeds sheets in contact with sheet paper in a cassette that is attached to and detached from an image forming machine main body, in which the rotating paper feeder is configured to feed sheets in accordance with the attachment and detachment operation. The member is provided with a leaning material that can be brought into contact with the rotating paper feed member in a separated manner, and the mounting operation of the cassette releases the contact between the rotating paper feeding member and the cleaning material, and the detaching action of the cassette causes the rotating paper feeding member and the cleaning material to come into contact with each other. It is characterized by contact.

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

FIGS. 2 and 3 are side views of a first embodiment of the present invention. FIG. 2 shows a state in which the paper feed cassette is inserted into the main body of the copying machine, and FIG. 3 shows a state in which the paper feed cassette is removed. 1 is a paper feed roller, 6 is a friction member, 7 is a presser plate, and 8 is a spring.

9 is a paper feed cassette, and 10 is a part of the side plate of the main body of the copying machine.

When the paper feed cassette runs out of sheets or when the paper feed cassette is removed from the copying machine to replace the paper feed cassette, the presser plate 7 is pushed up by the spring 8, and the friction member attached to the upper surface of the presser plate 7 6 contacts the paper feed roller 1. In conventional copying machines, when the paper feed cassette is taken out from the copying machine main body, the copying machine stops feeding the paper, but in the present invention, the bale from which the paper feed cassette is taken out and the paper feed roller rotate several times. The mechanism is incorporated into the control circuit of the paper feed roller body. It also remembers the number of copies made by the copier,
When the paper feed cassette is taken out after making a certain number of copies, the Mi roller may rotate several times. In addition, Ih allows you to rotate the paper feed roller arbitrarily,
If the paper feed roller becomes dirty, the paper feed cassette may be removed and the paper feed roller may be rotated.

After taking out the paper feed cassette 9 from the copying machine as described above, the friction member 6 on the presser plate 7 and the paper feed roller 1 are brought into contact with each other, and the paper feed roller 1 is rotated several times. The friction member adsorbs developing toner, fine cut scraps of sheet paper, and dust adhering to the peripheral surface. Therefore, the surface of the paper feed roller is kept clean and paper can be fed smoothly and reliably.

Possible materials for the friction member include rubber, felt, cloth, and cloth treated with flocking.
The rubbing member may be coated with a cleaning solution such as alcohol or trichloride, and cleaned with a cloth or the like, or replaced with a new one.

FIG. 4 is a cross section V of the second embodiment of the present invention, showing the sweetfish rubbing member 6.
By bending the presser plate 7 at the part where it is attached, the contact area between the paper feed roller 1 and the friction member 6 is increased, and the cleaning ability is improved. The other configurations are the same as those of the embodiments of the present invention described above. FIG. 5 is a cross-sectional view of a third embodiment of the present invention, in which the friction member 6 is divided into two parts so that it comes into contact with the paper feed roller at two places, and there is no dust or dirt between the two friction members. It has a place to put paper powder, etc. The other configurations are the same as those of the embodiments of the present invention described above, and will therefore be omitted.

As described above, according to the present invention, there is no need to incorporate a complicated device into the copying machine for cleaning the paper feed roller, a part of the control circuit of the rotating paper feed member drive system of the close-up copying machine is changed, and the cleaning of the paper feed roller and other Very simple 11 that only requires adding a few parts
It is possible to realize an inexpensive cleaning device for a rotating paper feeding member.

Furthermore, by using the apparatus according to the present invention, dirt on the circumferential surface of a rotating paper feeding member such as a paper feeding roller can be removed, and the surface roughness can be made substantially constant, and the gap between the sheet paper and the rotating paper feeding member can be removed. It is possible to maintain the coefficient of friction at a predetermined value and always perform smooth and reliable paper feeding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a conventional paper feed roller cleaning Ml device, FIGS. 2 and 3 are sectional views of an embodiment according to the present invention, and FIG. 4 is a sectional view of a second embodiment of the present invention. FIG. 5 is a sectional view of a third embodiment of the present invention. l is a paper feed roller, 6 is a friction member (cleaning material),
7 is a presser plate, 8 is a spring, and 9 is a paper feed cassette. −＼ Round 8

Claims (1)

[Claims] Sea) M in a cassette that can be attached to and detached from the image forming machine body
A sheet feeding device having a rotating sheet feeding member that feeds sheets in contact with the cassette is provided with a leaning material that can separate and abut against the rotating sheet feeding member in response to the loading/unloading operation, a paper feeding device, characterized in that the abutting string between the rotating paper feeding member and the cleaning material is released, and the rotating paper feeding member is brought into contact with the cleaning material by the above-described detachment operation of the cassette;