JP2669266B2 - Paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a facsimile machine and the like, and more particularly to a paper feeding mechanism.

[0002]

2. Description of the Related Art In a conventional paper feeding mechanism, holes are provided in a plate-shaped paper guide so that roller portions of a feed roller and a pinch roller protrude from a window portion, and paper is fed while being guided. Alternatively, the cover or the like is a plate-shaped paper guide in which the inside of the integrally molded plastic member is rib-shaped.

[0003]

In the paper guide of the conventional paper feeding mechanism, the plate-like member has a physical thickness, and the protrusion hole of the roller portion is set to be smaller than the roller by 1 to 2 times.
mm. Therefore, in feeding various sizes of paper, there is a drawback that the paper hits a gap between the paper guide and the roller and becomes a jam.

Further, the paper guide using the rib member on the inner surface of the cover has a drawback that the leading end of the paper guide has a high degree of freedom in feeding the paper, so that wrinkles, inclinations, jams, etc. of the paper are likely to occur.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a paper feeding mechanism for a printing apparatus or the like, which comprises a rib-shaped paper bar guide for guiding paper feeding, and a plurality of feeders arranged near the paper guide. Rollers, a plurality of pinch rollers engaged in pairs with the plurality of feed rollers, a bearing member for rotating and holding each of the plurality of pinch rollers, and a film member disposed along the paper transport surface. It has. Further, one end of the film member may be located in the vicinity of a contact portion between the plurality of feed rollers and the pinch roller, and the rib-shaped paper guide may also serve as the bearing member.

Further, the paper guide having the rib shape may have a curved surface, and the film member, the plurality of pinch rollers, or the film member and the plurality of pinch rollers are subjected to a static elimination process. There may be.

[0007]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention. In FIG. 1, the rib portion 1a on the inner side of the plastic cover 1 serves as a paper guide portion, and the paper is fed in the paper feeding direction indicated by an arrow A through a pinch roller 2 paired with a feed roller (not shown). Since there are various sizes of paper and sufficient flatness cannot be maintained only by the rib portion 1a, stable paper feeding is possible by providing the film-shaped paper guide 3.

FIG. 2 shows a bearing member 4 of the pinch roller 2 of FIG.
FIG. 3 is an enlarged view showing the assembly of FIG. In FIG. 2, the bearing member 4 is partially provided with a cut-and-raised portion 4a using a spring material.
A can be easily assembled by attaching a to the pinch roller mounting portion 1b.

FIG. 3 is a view showing another embodiment in which the pinch roller 3 is assembled by a rib portion 1b utilizing the spring property of a plastic material, for example.

FIG. 4 is a sectional view showing a case where the paper guide portion has a curved surface as still another embodiment. FIG.
Since the feed roller 5 side is a side from which the sheet escapes, the sheet fed in the direction of arrow B abuts against the pinch roller 2 and the rib portion 1a so as to be sandwiched. Then, the paper is guided by a film, which is a paper guide, riding on the circumferential surface of the pinch roller 2.

If the film 6 or the pinch roller 2 of the present embodiment or the film 6 and the pinch roller 2 are subjected to the static electricity removal treatment, the adsorption phenomenon due to the static electricity can be eliminated and the effect is further exerted. Can be.

[0013]

As described above, according to the paper feeding mechanism of the present invention, one end of the film disposed along the paper feeding surface is located near the contact portion between the plurality of feed rollers and the pinch rollers. Since the paper guide has a curved surface, the paper can be smoothly moved.

This film actually has a thickness of 0.1 m.
Although a sheet having a thickness of about m is used, since it is thin like this, it can be arranged in the vicinity of the contact portion between the feed roller and the pinch roller.
The occurrence of jam can be prevented.

Furthermore, by using the film, the pinch roller, or the film and the pinch roller, which have been subjected to the static electricity removing treatment, the adsorption phenomenon due to the static electricity can be eliminated, so that there is an effect that the sheet feeding becomes smoother. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing the pinch roller 2 of FIG.

FIG. 3 is an enlarged view showing another embodiment of the pinch roller 2 of FIG. 2;

FIG. 4 is a cross-sectional view illustrating a sheet feeding unit according to another embodiment of the present invention.

[Explanation of symbols]

 1 plastic cover 1a, 1c rib part 1c pinch roller mounting part 2 pinch roller 3 paper guide 4 bearing member 4a cut and raised part 5 feed roller 6 film

Claims (5)

(57) [Claims] 1. A paper feed mechanism for a printing device or the like, comprising a rib-shaped paver guide for guiding the paper feed.
A plurality of feed rollers arranged in the vicinity of the paper guide, a plurality of pinch rollers paired with and engaged with the plurality of feed rollers; a bearing member for rotating and holding the plurality of pinch rollers; And a film member arranged along the feeding surface of the sheet feeding mechanism. 2. The sheet feeding mechanism according to claim 1, wherein one end of the film member is located near a contact portion between the plurality of feed rollers and the pinch roller. 3. The sheet feeding mechanism according to claim 1, wherein the rib-shaped paver guide also serves as the bearing member. 4. The rib-shaped paver guide has a curved surface, according to claim 1.
Paper feed mechanism according to the item. 5. The film member, the plurality of pinch rollers, or the film member and the plurality of pinch rollers are subjected to a static elimination process. 2. The paper feeding mechanism according to claim 1.