JPH0251831B2 - - Google Patents

Description

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

In the conventional paper feeding device of a copying machine, the first
As shown in the figure, corner claws b swingably provided on both sides of the front end of a paper feed cassette a are used to feed the paper.

However, in the case of extremely thick paper such as government-made postcards and library cards, a large feeding force is required to buckle the paper using corner claws b, peel off only the topmost paper, and send it out. It was difficult to use b.

Another conventional paper feeding method was to control feeding using a side pad method, but this had the disadvantage that the side pads would wear out over long periods of use due to friction with the edges of the paper, resulting in poor reliability. Ta.

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

The present invention was made in view of the above circumstances, and its purpose is to provide a paper feeder that can reliably feed out extremely thick copy paper such as official postcards and library cards one by one without damaging them. 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, and the conveyance roll 7 belongs to the main body of the copying machine, and is fixed to and driven by a drive shaft 8.

A is a paper feed cassette, and the paper feed cassette A is provided with a cassette main body 9.

A bottom plate 5 is provided inside 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.

At the tip of the holding arm 2, there is a paper holding part 2 in the horizontal direction.
Further, an elastic member attachment part 2b is provided at the tip of the holding arm 2, and an elastic member 4 is attached by being press-fitted into the elastic member attachment part 2b.

In other words, the paper holding part 2a is a thin plate-like body that is continuous with the upper end surface 2' of the holding arm 2, bent inward and extending to the tip end surface 2'', and the elastic member attachment part 2b is the tip of the holding arm 2. The elastic member 4 is a thin plate-shaped body that is bent inward and continuous with the surface 2'', and has a mounting hole 4a into which the elastic member mounting portion 2b is press-fitted, and an upper end side cavity 4b. 4c is curved in an arc shape and is attached by press-fitting the attachment hole 4a into the elastic member attachment part 2b, and the upper end surface 4c is pressed against the lower surface of the paper holding part 2a and is slightly deformed, and the elastic member 4 is A material having a high coefficient of friction against the copying paper 1, such as urethane rubber, or a material capable of elastic deflection may be used.

When the paper holding part 2a is set on the paper 1 piled up by the weight of the holding arm 2, the elastic member 4
is opposed to 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 1 is fixed at the set position on the side surface by the partition plate 10.

When the copy start button is pressed, the transport roll 7 starts to rotate and the uppermost copy paper 1 is fed and hits the elastic member 4, but due to the feeding force of the copy paper 1 and the stiffness of the copy paper 1, Due to this, the elastic member 4 is bent between the upper end surface 4c of the elastic member 4 and the paper holding part 2a.
There will be a gap between the two. 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 hit the elastic member 4 and the elastic member 4 and paper 1
It is stopped by frictional resistance in between, so that it is not fed twice and goes out of the cassette.

Further, since the elastic member 4 has an upper end side cavity 4b and an upper end surface 4c is curved in an arc shape, the contact pressure applied to the paper holding part 2a of the elastic member 4 changes due to dimensional variations when attaching the parts. can be made small, the upper end surface 4c can always be brought into pressure contact with the paper holding part 2a with the optimum contact pressure, and the contact area of the upper end surface 4c can be increased to improve the paper handling effect, so that double feeding can be reliably prevented.

The paper feeding cassette 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 from a conventional paper feed cassette with corner claws and install a new holding arm 2. In this case, the cassette body and bottom plate are the same as the conventional product, resulting in a significant cost reduction. is possible.

Since the present invention has been described in detail above, it is possible to reliably send out extremely thick copy paper sheets such as government postcards and library cards one by one without damaging them.

In addition, since the elastic member 4 has the upper end side cavity 4b and the upper end surface 4c curved in an arc shape, it can always be pressed against the paper holding part 2a with an optimal contact pressure, and the paper handling effect can be improved. Double feeding can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a part of a conventional paper feeding device, FIG. 2 is a longitudinal sectional view of an embodiment of the present invention, FIG. 3 is a plan view of the same, and FIG. 4 is a perspective view of the same partially omitted. FIG. 5 is an explanatory diagram of the paper feeding state of the paper feeding device according to the present invention. 1 is a copy paper, 2 is a holding arm, 2a is a paper presser, 4 is an elastic member, 4b is a hollow portion, 4c is an upper end surface, and 7 is a transport roll.

Claims (1)

[Claims] 1. A holding arm 2 is provided on both sides of the inner side of the cassette body 9 as an arm that can swing vertically, a paper holding part 2a is provided at the tip of the holding arm 2, and a paper presser 2a is provided at the tip of the holding arm 2. A sheet of copy paper 4 is elastically deformed by the collision of the fed-out copy paper 1 and is provided between the paper presser 2a and the elastic member 4 between the upper end side cavity 4b and the arcuate curved upper end surface 4c. A paper feeding device characterized in that the upper end surface 4c thereof is in constant pressure contact with the paper holding portion 2a.