JPS5926836A - Sheet feeder - Google Patents

Abstract

PURPOSE:To provide a durable thick sheet feeder mechanism, by forcibly pressing a sheet by means of an elastic member having high friction factor of 0.8 or more and hardness of 30 deg.-50 deg.. CONSTITUTION:Each of holder arms 2, vertically rockably mounted to both inner surfaces of a cassette body 9, is provided at its forward end with a sheet retaining part 2a and an elastic member 4 which is elastically deformed resulting from its collosion with a copying sheet 1 fed out by rotation of a convey roll 7 to form a gap, having a size sufficient to allow the passage of one copying sheet 1, between the elastic member and the sheet retaining part 2a, the elastic member 4 being made of a natural rubber material having high friction factor of 0.8 or more and hardness of 30 deg.-50 deg.. This enables very thick copying sheets, such as postcards, book cards, etc. to be reliably fed out one by one without damaging them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a copying machine used for feeding extra thick sheets such as government postcards and library cards.

In the paper feeding device of a conventional copying machine, as shown in Fig. 1, corner claws A' (i7) are swingably provided on both sides of the front end of the paper feed cassette a. Ta.

However, in the case of extra-thick paper such as government-made oysters and illustrated cards, the corner claws 6 are used to buckle the paper.
In order to separate and feed only the top sheet, a large feeding force is required, making it difficult to actually use a corner hook.

In addition, another conventional paper feeding method was to control feeding using the site-on-kundo method, but this method caused friction with the edges of the paper and the sidebands caused wear noises due to long-term use, resulting in unreliability. It had the disadvantage of being lacking in

In addition to the above methods, there are also paper feeding methods using a retard roll system or a refrad belt system, but these methods have the drawback of high costs for small-sized copying machines.

The present invention has been made in view of the above circumstances, and its purpose is to provide a paper feeder that can reliably feed out one sheet at a time without damaging extremely thick copy paper such as official postcards and library cards. The goal is to provide equipment.

Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures.

Reference numeral 7 in the drawing indicates a conveyance roll, which belongs to the main body of the copying machine and is fixed to and driven by a drive shaft 8.

The paper feed cassette A is equipped with a cassette main body 9.

A bottom plate 5 is provided in the cassette body 9 so as to be movable up and down, and a spring 6 is interposed between the bottom plate 5 and the bottom of the cassette body 9, and the spring 6 is placed on the bottom plate 5. The copy paper 1 is pressed against the transport roll 7 with appropriate pressure.

The base end of the holding arm 2 is attached to the inner surface of the cassette body 9 by a shaft 3, and the holding arm 2 can move up and down about the shaft 3 as a fulcrum.

A paper holding portion 2a is provided in the horizontal direction at the tip of the holding arm 2, and an elastic member attachment portion 2h is provided at the tip of the holding arm 2.
This elastic member attachment portion 2hK is attached by press-fitting the elastic member 4.

The tab and paper holding part 2α are continuous with the upper end surface 2' of the holding arm 2, and are bent inward to form a thin plate-like body extending to the tip end surface 2#. Tip surface 2N
The elastic member 4 has a mounting hole 4α into which the elastic member mounting portion 2b is press-fitted, and an upper end hollow portion 475, and the upper end surface 4C is circular. The elastic member 4 has a high friction coefficient of 0.8 or more, and is curved in an arc shape and is mounted by press-fitting the mounting hole 4α into the elastic member mounting portion 2h. It is made of natural rubber material with a bend of 30° to 50°.

When the paper pressing portion 2α is centered on the stacked paper 1 by the weight of the holding arm 2, the elastic member 4 faces the leading edge of the copy paper 1.

Further, a partition plate 10 is provided between the bottom plate 5 and the holding arm 2 integrally with the cassette main body 9, and the copy paper I can be fixed at a set position on the side surface by the partition plate 10.

When the copy start button is pressed, the transport roll 7
begins to rotate and the uppermost copy sheet 1 is fed and the elastic member 4
However, due to the feeding force of the copy paper 1 and the stiffness of the copy paper 1, the elastic member 4 flexes and the upper end surface 4 of the elastic member 4 is bent.
A gap is created between c and the paper holding part 2a. When this gap reaches a size necessary for one sheet to pass through, the copy paper 1 is sent out from this gap.

At this time, if the second and subsequent sheets of copy paper 1 from the top are fed at the same time, the second and subsequent sheets of copy paper 1 will hit the elastic member 4 due to the frictional resistance between the elastic member 4 and the paper 1. It will not be stopped, double fed, and go out of the cassette.

Further, the elastic member 4 has a high coefficient of friction of 0.8 or more,
Since it is made of natural rubber material with a hardness of 30" to 50°, it has the function (that is, paper handling ability) to prevent the second and subsequent sheets of copy paper from being fed multiple times and coming out of the cassette. It becomes superior and has improved durability.

Paper feeding force sensor A) in the paper feeding device according to the present invention can be used in conventional general copying machines.

In addition, it is possible to remove the corner claws and install a new holding arm 2 on a conventional paper feed center with corner claws. In this case, the cassette body and bottom plate are the same as the conventional product, so Cost reduction is possible.

Since the present invention has been described in detail above, it is possible to reliably feed extra-thick copy sheets such as official postcards and library cards one by one without damaging them.

Furthermore, since the elastic member 4 is a natural rubber material having a high coefficient of friction of 048 or more and a hardness of 30'' to 50°,
Excellent paper handling ability and improved durability.

[Brief explanation of drawings]

Figure 1 is a partial perspective view of a conventional paper feeding device;
3 is a plan view of the same, FIG. 4 is a partially omitted perspective view of the same, and FIG. 5 is an explanation of the paper feeding state of the paper feeding device according to the present invention. It is a diagram. ] is a copy paper, 2 is a holding arm, 2α is a paper presser, 4 is an elastic member, and 7t is a transport roll. Representative Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 3 Figure 4 Cause Figure 5

Claims (1)

[Claims] A holding arm 2 is provided on both sides of the inside of the cassette body 9 so as to be able to swing up and down, and a paper holding part 2α is provided at the tip of the holding arm 2. Due to the collision of the paper 1, it is elastically deformed and the paper holding part 2
An elastic member 4 is provided to form a gap through which a sheet of copy paper 1 can pass, and the elastic member 4 is made of a material having a high friction coefficient of 0.8 or more and a hardness of 30' to 50°. A paper feeding device characterized by being made of natural rubber material with