JP2004149310A - Sheet feeder - Google Patents

Abstract

Provided is a friction-separation-type sheet feeding device capable of enhancing an abnormal noise prevention effect with a simple configuration.
A friction member (2) is pressed against a paper feed roller (1) by a pressure spring (5), and paper is separated one by one at a nip portion between the paper feed roller (1) and the friction member (2), and is fed from the uppermost paper. In the paper feeding device of the system, a vibration isolating member 6 is provided at one end of the pressure spring 5.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a friction separation type paper feeding device in which a friction member is pressed against a paper feed roller by a pressure spring, and paper is separated one by one at a nip portion between the paper feed roller and the friction member and fed from the top paper. About. The paper feeding device of the present invention is applied to an image forming apparatus such as a copying machine, a facsimile, a printer, and a multifunction peripheral.
[0002]
[Prior art]
The friction separation type paper feeder, which presses the friction member against the paper feed roller by a pressure spring, separates the paper one by one at the nip between the paper feed roller and the friction member, and feeds the paper from the top paper, has a structure. It is simple and is widely used especially in low-cost popular machines (image forming apparatuses).
[0003]
However, this type of sheet feeding device has a problem that a friction noise is generated between the sheet feeding roller and the friction member. For this reason, in the related art, the friction member is divided into the upstream and downstream portions in the paper traveling direction to take measures against abnormal noise (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-302004 A
[Problems to be solved by the invention]
As described above, it has been conventionally proposed to take measures against abnormal noise in a paper feeder of a friction separation system. However, the generation of the fricative noise cannot be completely suppressed by the conventional technology.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a friction-separation type sheet feeding device that can enhance the noise prevention effect with a simple configuration.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the friction member is pressed against the paper feed roller by a pressure spring, and the paper is separated one by one at a nip portion between the paper feed roller and the friction member to form the uppermost sheet. The most important feature of a friction separation type paper feeding apparatus that feeds paper from paper is that a vibration isolating member is provided at one end of a pressure spring.
[0008]
According to a second aspect of the present invention, the vibration isolating member is mainly provided at the end of the pressure spring on the side of the base to which the pressure spring is fixed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a main part configuration diagram of a sheet feeding device according to an embodiment of the present invention. An upstream-side friction member 2a and a downstream-side friction member 2b are arranged to face the sheet feed roller 1. The upstream friction member 2a and the downstream friction member 2b are held by a holder 3.
[0010]
A pressure spring 5 is interposed between the holder 3 and the base 4 in a compressed state. The holder 3 is urged toward the paper feed roller 1 by the elastic force of the pressure spring 5, whereby the upstream friction member 2 a and the downstream friction member 2 b are pressed against the paper feed roller 1. The sheets S are separated one by one at a nip N between the sheet feeding roller 1 and the upstream friction member 2a and the downstream friction member 2b, and are sequentially fed downstream from the top sheet.
[0011]
Here, in the present invention, the vibration isolating member 6 is provided at one end of the pressure spring 5. In the present embodiment, the vibration isolating member 6 is provided at the end of the pressure spring on the side of the base 4 to which the pressure spring 5 is fixed. The material of the vibration isolator 6 may be rubber, sponge, foam material, or the like.
[0012]
By providing the vibration isolating member 6, when the paper feed roller 1 is driven or rotated, the noise generated between the rubber of the paper feed roller 1 and the paper S or between the paper S and the friction member 2 via the holder 3 ( Vibration noise) can be prevented.
[0013]
【The invention's effect】
As described above, according to the present invention, the friction member is pressed against the paper feed roller by the pressure spring, the paper is separated one by one at the nip portion between the paper feed roller and the friction member, and the paper is fed from the top paper. With a simple configuration in which a vibration isolating member is provided only at one end of a pressure spring, an abnormal noise (vibration noise) generated between the paper feeding roller and the paper or between the paper and the friction member is obtained. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a main part configuration diagram of a sheet feeding device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper feed roller 2a Upstream friction member 2b Downstream friction member 3 Holder 4 Base part 5 Pressure spring 6 Anti-vibration member

Claims (2)

In a friction separation type paper feeder that presses a friction member against a paper feed roller by a pressure spring, separates the paper one by one at the nip between the paper feed roller and the friction member, and feeds the paper from the top paper, A sheet feeding device, wherein a vibration isolating member is provided at one end of a spring. 2. The sheet feeding device according to claim 1, wherein the vibration isolating member is provided at an end of the pressure spring on a side of the base to which the pressure spring is fixed.

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