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Sheet feeding device and image forming apparatus

a feeding device and a technology for forming apparatus, applied in the direction of thin material processing, article separation, transportation and packaging, etc., can solve the problems of abnormal noise, chattering noise, abnormal noise, etc., and achieve the effect of reducing the speed of sheet conveyance and suppressing any vibration

Inactive Publication Date: 2008-12-18
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention suppresses any vibration generated during an abutment of a feeding roller against a separating pad without any reduction of a sheet conveyance speed or any degradation of a separating / feeding performance, so as to prevent any generation of an abnormal noise (i.e., a chattering noise) due to the vibration.
[0011]According to the present invention, the vibration generated during the abutment of the feeding roller against the separating pad can be suppressed without any reduction of the sheet conveyance speed or any degradation of the separating / feeding performance, so that the generation of an abnormal noise (i.e., a chattering noise) due to the vibration can be prevented.

Problems solved by technology

In the sheet feeding device of the separation system, vibrations may be generated between the feeding roller and the separating pad according to a type of sheet to be fed, and further, the vibrations may cause an abnormal noise (i.e., a chattering noise).
However, even the above-described prior art cannot prevent any vibration caused by friction between the sheet and the separating pad generated at the time of the abutment of the feeding roller rotated during the sheet feeding against the separating pad via the sheet, and therefore, the vibration causes an abnormal noise (i.e., a chattering noise).
However, this degrades the separability of the sheet by the separating pad, thereby achieving a satisfactory separating / feeding performance.
However, this reduces a sheet conveyance speed.

Method used

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  • Sheet feeding device and image forming apparatus
  • Sheet feeding device and image forming apparatus
  • Sheet feeding device and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

[0026]FIG. 1 is a view exemplifying the schematic configuration of an image forming apparatus provided with a sheet feeding device, and FIG. 2 is a perspective view illustrating essential parts of the sheet feeding device.

[0027]As shown in FIGS. 1 and 2, an inside plate 101 is disposed in a sheet cassette 114, and thus, presses upward sheets S stacked thereon by force of an urging spring 113. A feeding roller 102 is fixed to a support shaft 108, to be rotatably supported thereon. An uppermost sheet out of the sheets S pressed up by the inside plate 101 abuts at the tip thereof against the feeding roller 102. The feeding roller 102 has a roller surface 102r which feeds the sheet thereon. The roller surface 102r is formed into an arcuate shape in cross section, and is disposed at a part of the feeding roller in a rotational direction. Here, the feeding roller 102 has the roller surface 102r formed into a semicircle in cross section. A front portion 102ra illustrated in FIG. 8 of the r...

second exemplary embodiment

[0044]A sheet feeding device in a second exemplary embodiment is described in reference to FIGS. 10A and 10B. Here, a mechanical structure in the present exemplary embodiment is substantially identical to that in the first exemplary embodiment. Therefore, reference numerals illustrated in FIGS. 1 to 9 are used, and further, constituent elements designated by the reference numerals will not be described. In addition, an operation in the second exemplary embodiment also is identical to that in the first exemplary embodiment, and therefore, its description will be omitted below.

[0045]In the present exemplary embodiment, out of boundaries 103b between a separating pad holding member 103 and a separating pad 104, boundaries 103b2 in a second region are formed in a sheet conveyance direction upstream of another boundary 103b1 in a first region, against which a feeding roller surface 102r abuts. Here, a distance t between the boundary 103b1 and the boundary 103b2 is set to 0.8 mm, although...

third exemplary embodiment

[0049]A sheet feeding device in a third exemplary embodiment is described in reference to FIGS. 11A and 11B. Here, a mechanical structure in the present exemplary embodiment is substantially identical to those in the first and second exemplary embodiments. Therefore, reference numerals illustrated in FIGS. 1 to 9 are used, and further, constituent elements designated by the reference numerals will not be described. In addition, an operation in the third exemplary embodiment also is identical to those in the first and second exemplary embodiments, and therefore, its description will be omitted below.

[0050]In the present exemplary embodiment, a separating pad holding member 103 holds a sliding member 103s, which is made of a material harder than the separating pad holding member 103 and has a high surface performance, in a region (having a width 103w), against which a feeding roller surface 102r abuts, and upstream in a sheet conveyance direction of a separating pad 104. Here, an SUS ...

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PUM

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Abstract

A boundary is formed between a separating pad holding member and a separating pad in a sheet conveyance direction such that a sheet feeding device includes: a feeding roller having a feeding roller surface at a part in a rotational direction; the separating pad which separates the sheet at a holding portion between the feeding roller surface and the same; the separating pad holding member which presses the separating pad against the feeding roller; and a rolling member which is disposed coaxially with the feeding roller and abuts against the separating pad free from the holding state in cooperation with the roller surface; the feeding roller surface abutting against the separating pad holding member and the separating pad in this order, respectively, via the sheet S during the rotation of the feeding roller.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a sheet feeding device which separates sheets such as originals or recording sheets one by one and feeds them, and an image forming apparatus having the sheet feeding device such as a copying machine, a facsimile or a printer.[0003]2. Description of the Related Art[0004]In an image forming apparatus such as a copying machine or a printer, the stability of feeding performance and the reduction of an operational noise has been required for a sheet feeding device which separates sheets such as originals or recording sheets one by one and feeds them. There has been conventionally known a sheet feeding device having a system in which sheets are separated one by one by a semicircular feeding roller and a separating pad pressed against the feeding roller. In the sheet feeding device of the separation system, vibrations may be generated between the feeding roller and the separating pad according...

Claims

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Application Information

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IPC IPC(8): B65H5/06
CPCB65H3/0638B65H3/5223B65H2404/1112B65H2404/5311
Inventor MURAMATSU, MOTOYASU
Owner CANON KK