JP2002362771A - Recording paper separating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording paper separating device capable of surely positioning a tip part in the paper feeding direction of the recording paper, and preventing the skew and jam. SOLUTION: This recording paper separating device for closely pressing a paper feed roller 1 to plural sheets of recording paper 4 stacked on a paper cassette 5 for separating and conveying the same, is provided with the paper feed roller 1 selectively rotated in the paper feed direction or stopped, and a stopper 9 selectively delivering and stopping the recording paper 4. The paper feed roller 1 is rotated to bend the tip part of the recording paper 4, then the rotation of the paper feed roller 1 is stopped, and the stopper 9 is opened simultaneously or late.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a facsimile, a printer and a copying machine, an image reading apparatus such as a scanner, and a multifunction machine having these functions (hereinafter simply referred to as an image forming apparatus). 2) relates to a recording paper separating apparatus for separating and conveying recording paper.

[0002]

2. Description of the Related Art Conventionally, for example, various types of separation paper feeders have been used in a paper feeder in an image forming apparatus or the like. Is provided with a pair of left and right separation claws. These are fed with a conveying force to the recording paper by the rotation of the paper feed roller. Then, the sheet is fed to the image forming unit.

[0003]

However, in the conventional claw separation method, a pair of left and right separation claws are provided on the leading end side in the paper feeding direction, and two paper feeding rollers are provided on both sides of the recording paper. I have. For this reason, skew or a jam has occurred due to a shift in the timing at which the left and right separation claws come off. As a countermeasure for this, the use of high-precision parts and the adjustment of assembly were performed.

Therefore, according to the invention described in each of the claims, the leading end of the recording paper in the paper feeding direction is reliably positioned by a stopper, separated one by one, conveyed to an image forming section, and skewed or jammed. It is an object of the present invention to provide a recording paper separating device capable of preventing the occurrence of the recording paper.

[0005]

According to the present invention, in order to solve the above-mentioned problems, according to the first aspect of the present invention, a plurality of recording papers stacked in a paper feed cassette are pressed against each other by a paper feed roller to be separated and conveyed. A recording paper separating apparatus, comprising: a paper feeding roller for selectively rotating and stopping rotation in a paper feeding direction; and a stopper for selectively transporting and stopping the recording paper. The stopper is opened simultaneously with or after the rotation of the paper feed roller is stopped after the leading end of the recording paper is bent.

According to a second aspect of the present invention, in the recording paper separating apparatus according to the first aspect, a transport roller and a slippery roller are arranged at a position where the bending of the recording paper cannot be extended.

According to the third aspect of the present invention, the first or second aspect is provided.
In the recording paper separating apparatus described above, the paper feed roller is provided at one position at the center of the recording paper.

In the present invention, the recording paper can naturally be used for paper used in an image forming apparatus and the like, and also for an original such as a facsimile apparatus.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side cross-sectional view showing a state in which a stopper of the recording paper separating apparatus of the present invention is closed, and FIG. 2 is a side cross-sectional view showing a state in which the stopper is open, partially.

As shown in FIGS. 1 and 2, the recording paper separating apparatus includes a paper feeding roller 1, a transporting roller 2, a transporting unit 3 including an opposing roller, and a feeding unit capable of storing the recording paper 4. And a paper cassette 5. One paper feed roller 1 is arranged at the center of the recording paper 4.

On the cassette body 6 of the paper feed cassette 5, the recording paper 4 is loaded on a loading plate 7 rotatable up and down about a support shaft (not shown) as a fulcrum. By being pushed upward, the leading end in the sheet feeding direction is lifted. Recording paper 4 stored in cassette body 6
Are restricted by guide plates (not shown) on both sides in the width direction.

The guide plate is provided with a stopper 9 for holding the leading ends of the plurality of recording papers 4 stacked on the stacking plate 7 and the upper surface of the leading end portion. Has one end supported, and the recording paper 4
The upper end and the upper end of the upper end are regulated. The stopper 9 does not necessarily need to be attached to the paper feed cassette 5, but may be attached to the main body of the apparatus and moved up and down.

A description will be given of a state in which the stopper 9 is closed as shown in FIG.
First, when the paper feed roller 1 is driven to rotate, only the uppermost recording paper 4 in contact with the outer peripheral surface of the paper feed roller 1 is conveyed. The recording paper 4 is curved convexly between the stopper 9 and the paper feed roller 1. That is, the recording paper 4 is bent upward. Then, when a certain degree of bending is achieved, the paper feed roller 1 stops rotating while pressing the recording paper 4,
At the same time, when the stopper 9 is opened, the recording paper 4 is nipped and conveyed by the conveying roller 2 and the opposing roller 3 (slippery roller) using the stiffness of the recording paper 4.

Further, the opened stopper 9 is used for the recording paper 4.
Are opened and closed each time they are separated and transported one by one. Further, it is needless to say that the same effect can be obtained even if the timing is delayed, though slightly, as compared with the case where the stopper 9 is opened simultaneously with the sheet feeding roller 1.

The distance between the conveying roller 2, the opposing roller 3, and the recording paper 4 is such that the leading end of the recording paper 4 moves forward in order to increase the bending of the recording paper 4, but the conveying roller 2 is located at a position where the bending is not fully expanded. The opposing roller 3 is arranged. By ensuring that the leading end of the recording paper 4 comes to the contact point of the rollers 2 and 3, the recording paper 4
And the rollers 2 and 3 can be accurately positioned. Further, it may be optimized by the thickness of the recording paper 4, the strength of the waist, and the like.

The transport roller 2 is formed of rubber.
The opposing roller 3 may be made of a slippery material, for example, metal or resin. If one of the rollers 2 and 3 is a slippery roller, the leading end of the recording paper 4 is reliably nipped and conveyed without skew.

Although the description has been given of the image forming apparatus, the same effect can be obtained in other recording apparatuses and reading apparatuses.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified at the stage of implementation without departing from the scope of the invention. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed components. For example, even if some components are deleted from all the components shown in the embodiments, the problem described in the column of the problem to be solved by the invention can be solved, and the problem described in the column of the effect of the invention can be solved. In the case where a certain effect can be obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

[0019]

As described above, according to the invention described in each of the claims, the leading end of the recording paper in the paper feeding direction is reliably positioned by the stopper, separated one by one, and conveyed to the image forming section. In addition, skew and jam can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state in which a stopper of a recording paper separating apparatus according to an embodiment of the present invention is closed, with a part thereof being cut away.

FIG. 2 is a side sectional view showing a state in which a stopper of the recording paper separating apparatus according to the embodiment of the present invention is opened, with a part thereof being cut away.

[Explanation of symbols]

 1 paper feed roller 4 recording paper 5 paper feed cassette 9 stopper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H072 BA08 BA12 BA20 CA01 CB05 HB07 JA02 JC08 3F102 AA02 AA10 AA11 AB01 BA02 BA09 BB02 DA06 EA01 3F343 FA02 FB02 FB03 FC05 FC14 GA03 GB01 GC01 GD01 HD18 HE07 JA03 KA06 LD MB13 MC04 MC10 MC26

Claims (3)

[Claims] 1. A paper feed roller for selectively rotating and stopping rotation in a paper feed direction in a recording paper separating apparatus for pressing and separating a plurality of recording papers stacked in a paper feed cassette by a paper feed roller to separate and convey the paper. And a stopper for selectively performing conveyance and stop of the recording paper, and rotating the paper supply roller to bend the leading end of the recording paper, and simultaneously stopping the rotation of the paper supply roller, or A recording paper separating device, characterized in that the stopper is opened with a delay. 2. The recording paper separating apparatus according to claim 1, wherein a conveying roller and a slippery roller are arranged at a position where the bending of the recording paper cannot be extended. 3. The recording paper separating apparatus according to claim 1, wherein the paper feed roller is provided at one position of a center of the recording paper.