JPH09278212A - Paper feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a replacement property and mounting precision of a bottom plate pad arranged in a bottom plate of a paper feeding tray so as to reduce the number of disposal of the bottom plate pad in replacement. SOLUTION: A recess part 17 is arranged at the front end in the paper feeding direction in a bottom plate 15, and a pair of claws 18, 18 are opposedly arranged on both side edge parts of the recess part, 17 while extended over the recess part 17. Notches 19, 19 whose shapes allow insertion of the claws 18, 18 are arranged in a bottom plate pad 16 which is formed so as to be allowed to be fitted into the recess part 17. The notches 19, 19 are also arranged on the back face of the bottom plate pad 16, so that the shape of the bottom plate pad 16 on the front side is the same as that on the back side. The bottom plate pad 16 is inserted into the recess part 17 from the paper feeding directional front end side, and the claws 18 are fitted into the notches 19 while the bottom plate pad 16 is deformed according to elasticity of itself, and the bottom plate pad 16 is set on the bottom plate 15 when the bottom face of the notch 19 is pressed. If the front face side is abraded, the bottom plate pad 16 is removed once, and then, the bottom plate pad 16 is turned upside down so as to be set again in the bottom plate 15 in the same way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device such as a printer, a copying machine and a fax machine.

[0002]

2. Description of the Related Art In a conventional paper feed tray, as shown in FIG. 5, in all types of FRR paper feed, friction pad paper feed, corner claw paper feed, etc., the paper feed tray rises according to the remaining amount of paper and reaches the top. The bottom plate 1 is used to feed the above paper to the paper feed section. A bottom plate pad 2 made of a friction member such as cork is adhered to the bottom plate 1 by a double-sided tape or the like in order to prevent the stacked sheets from being bundled together and fed to the paper feed section. Is provided (for example, the actual exploitation 58
-197974).

[0003]

This bottom plate pad 2 is
Each time the paper feeding operation is repeated, the lower surface of the lowermost paper stacked on the bottom plate 1 is brought into sliding contact with the lower paper, so that the paper is worn down and the frictional force is reduced according to the number of paper feeding. Therefore, it is necessary for a service person or a user to regularly replace the bottom plate pad 2. In order to replace the bottom plate pad 2, it is necessary to peel off the bottom plate pad 2 fixed with a double-sided tape or the like from the surface of the bottom plate 1 and attach a new pad again each time, but it does not easily peel off. There was a problem that it was difficult to stick it to a predetermined position because it became oblique when sticking. Further, there has been a problem that the bottom plate pad, which has been removed in the past, must be discarded each time it is replaced.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to provide a paper feeding device which is excellent in replaceability, has high mounting accuracy, and can reduce the number of times of discarding the bottom plate pad at the time of replacement. And

[0005]

According to a first aspect of the present invention, there is provided a paper feeding unit for separating and feeding paper sheets one by one, a stacking unit for stacking paper sheets, and a stacked unit. In a sheet feeding device having a bottom plate that moves up and down according to the number of sheets to guide the sheets to the separating unit and a bottom plate pad fixed to the bottom plate so as to abut the lowest sheet of the stacked sheets, the bottom plate pads are engaged and recessed. Is engaged with the bottom plate.

According to a second aspect of the present invention, a concave portion and a claw body projecting above the concave portion are provided at a portion of the bottom plate where the bottom plate pad is provided, and the bottom plate pad has a shape capable of being fitted into the concave portion. It is characterized in that at least one surface which is a surface at the time of fitting is provided with a recess into which the claw body can be fitted.

A third aspect of the present invention is characterized in that the front and back surfaces of the bottom plate pad have the same shape.

According to a fourth aspect of the present invention, a pair of cut grooves are provided at a portion of the bottom plate where the bottom plate pad is provided, and a projection is formed at an opening end of the cut groove, and the bottom plate pad is an annular belt body. As a result, the edge portion can be locked by the protrusion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view (A) and an enlarged perspective view (B) of a main part of an embodiment of a sheet feeding device according to the present invention.
FIG. 2 is a perspective view corresponding to FIG. 1B showing a state where the bottom plate pad is attached to the bottom plate in the apparatus of the embodiment shown in FIG.
In the figure, the paper 11 stacked on the paper feed tray 10 is F
In the RR paper feeding, the pickup roller 12 feeds the sheets one by one, and the feed roller 13 and the reverse roller 14
The paper 11 guided to the nip between the
When 1 runs out, the bottom plate 15 rotates upward and the paper 1
Raise a stack of 1. At this time, the bottom plate pad 16 is provided substantially at the center of the front end of the bottom plate 15 so that the bottom plate pad 16 is in contact with the lower surface of the lowermost paper 11 so that the paper 11 is not sent out as a bundle (that is, not to be double-fed). .

The bottom plate pad 16 is attached to the bottom plate 15 as shown in FIG. 1 (B). That is, the bottom plate 1
A concave portion 17 is provided at the center of the front end of the sheet feeding direction of FIG. 5 by squeezing, and a pair of claws 18, 18 are provided on both side edges of the concave portion 17 so as to project above the concave portion 17. Further, the bottom plate pad 16 has a shape capable of being fitted into the recess 17, and notches 19 and 19 having a shape capable of fitting the claw 18 into a position corresponding to the claw 18 are provided at both ends in a direction orthogonal to the sheet feeding direction. . The notch 19 is also provided on the back surface of the bottom plate pad 16, so that the bottom plate pad 16 has the same shape on the front and back sides. As the material of the bottom plate pad 16, it is possible to use a material that has elasticity and is conventionally used.

When the bottom plate pad 16 is set on the bottom plate 15, the bottom plate pad 16 is inserted into the recess 17 from the front end side in the sheet feeding direction, and the claw 18 is fitted into the notch 19 while being deformed by the elasticity of the bottom plate pad 16 itself. Just attach it like this. Then, as shown in FIG. 3, the claw 18 presses the bottom surface of the notch 19, and rattling of the bottom plate pad 16 can be regulated without fixing with an adhesive or the like. If the bottom plate pad 16 is used in this state and the surface side of the bottom plate pad 16 has worn down and has decreased, once
It can be reused by removing it, reversing the front and back, and setting it again in the same manner, and it is not necessary to replace it once.
Further, since the mounting position of the bottom plate pad 16 to the bottom plate 15 is regulated by the recessed portion 17, the mounting position does not deviate no matter how many times it is replaced.

FIG. 4 is an enlarged perspective view of an essential part showing another embodiment of the present invention. The bottom plate 20 of the present embodiment is provided with a pair of grooves 21, 21 at the center of the front end side in the sheet feeding direction, and projections 22 projecting inwardly of the grooves are formed at the open ends thereof. On the other hand, the bottom plate pad 23 is formed by forming a belt body in an annular shape. When the bottom plate pad 23 is set on the bottom plate 20, the elasticity of the bottom plate pad 23 is used to form the grooves 21, 2
It is only necessary to insert it into the connector 1 and press the edge of the bottom plate pad 23 with the protrusion 22. In this example, the bottom plate pad 23
If the wear is worn, the annular belt-shaped bottom plate pad 23 may be rotated to position it on the upper surface of the bottom plate 20 so that the unweared portion can be used. In this example,
The position where the bottom plate pad 23 is attached to the bottom plate 20 is the groove 21,
Since it is restrained by 21, the mounting position will not be misaligned no matter how many times it is replaced.

[0013]

As described above, in the paper feeding device according to the first and second aspects of the invention, the bottom plate pad is attached to the bottom plate by the concave and convex engagement, in other words, the bottom plate pad is attached to the bottom plate by the so-called snap fit. No adhesive is required for mounting,
Positioned easily and accurately by a serviceman or user,
This has the effect of enabling attachment and replacement.

In the paper feeding device of the third aspect, since the bottom plate pad has the same shape as the front and back sides, in addition to the above common effect, one side can be turned over after use, and the number of times the bottom plate pad is discarded is half that of the conventional one. The effect is that you can do it.

In the paper feeding device according to the fourth aspect of the invention, the bottom plate pad is belt-shaped and is inserted into a pair of grooves of the bottom plate to be stopped. Therefore, in addition to the above-described common effects, the belt-shaped bottom plate pad is worn and worn. Since it is possible to use the parts other than the parts, it is possible to significantly reduce the number of times the bottom plate pad is discarded.

[Brief description of drawings]

FIG. 1 is a sectional view (A) and an enlarged perspective view (B) of a main part of an embodiment of a sheet feeding device according to the present invention.

FIG. 2 is a perspective view showing a state where a bottom plate pad is attached to the bottom plate in the apparatus of the embodiment shown in FIG.

FIG. 3 is a sectional view of the same.

FIG. 4 is an enlarged perspective view of an essential part showing another embodiment of the present invention.

FIG. 5 is a perspective view showing a bottom plate and a paper feed pad of a conventional paper feeder.

[Explanation of symbols]

 10 Paper Tray 11 Paper 12 Pickup Roller 13 Feed Roller 14 Reverse Roller 15 Bottom Plate 16 Bottom Plate Pad 17 Recess 18 Claw 19 Notch 20 Bottom Plate 21 Groove 22 Projection 23 Bottom Plate Pad

Claims (4)

[Claims] 1. A paper feeding section for separating and feeding the sheets one by one, a stacking section for stacking the sheets, a bottom plate for raising and lowering the sheets according to the number of the stacked sheets to guide the sheets to the separating section, and A sheet feeding device having a bottom plate pad fixed to the bottom plate so as to contact the lowest sheet, wherein the bottom plate pad is engaged with the bottom plate by concave and convex engagement. 2. A concave portion and a claw body projecting above the concave portion are provided at a portion of the bottom plate where the bottom plate pad is provided, and the bottom plate pad has a shape capable of being fitted into the concave portion and serves as a surface at least when fitted. 2. The paper feeding device according to claim 1, wherein a concave portion into which the claw body can be fitted is provided on one surface. 3. The paper feeder according to claim 2, wherein the front and back surfaces of the bottom plate pad have the same shape. 4. A pair of cut grooves is provided at a portion of the bottom plate where the bottom plate pad is provided, and a projection is formed at an opening end of the cut groove, and the bottom plate pad serves as an annular belt body, and an edge portion thereof is projected. The sheet feeding device according to claim 1, wherein the sheet feeding device is capable of being locked by the section.