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Sheet feeding device and image forming apparatus

a feeding device and a technology of forming apparatus, applied in the direction of transportation and packaging, thin material processing, article separation, etc., can solve the problems of increasing the force necessary to separate and convey the sheet having the large stiffness, and the performance of the separation performance degrades for the sheet having the small stiffness

Inactive Publication Date: 2014-06-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a sheet feeding device that includes a sheet stacking portion, a sheet feeding portion, a separating portion, a force applying portion, and a support portion. The separating portion has a movable separating slope that separates sheets one by one when fed by the sheet feeding portion. The force applying portion applies a force opposite to the sheet feeding direction to the separating portion. The support portion supports the separating portion such that it is movable and sloped in connection with the movement when abutting on the sheet fed by the sheet feeding portion and moving a downstream side in the sheet feeding direction against the force applying portion. This design helps to ensure smooth and reliable feeding of sheets through the device.

Problems solved by technology

That is, separating performance degrades for the sheet having the small stiffness when the force necessary to separate and convey the sheet having the large stiffness is decreased, and the force necessary to separate and convey the sheet having the large stiffness increases when the sheet having the small stiffness is securely separated.

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 embodiment

[0021]Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view illustrating a configuration of an image forming apparatus including a sheet feeding device according to the present invention. In FIG. 1, the numeral 50 designates a laser beam printer and the numeral 50A designates a laser beam printer body (hereinafter referred to as a printer body). The printer body 50A includes an image forming portion 50B. A sheet feeding device 1 that feeds a sheet S, such as a recording sheet, which is stacked on and stored in a tray 3, to the image forming portion 50B is provided in a lower portion of the printer body 50A.

[0022]The image forming portion 50B includes a process cartridge 21, and the process cartridge 21 includes a photosensitive drum 21a, a charging device (not illustrated), a development sleeve (not illustrated), and a cleaner (not illustrated). The image forming portion 50B also includes a laser scanner 20 tha...

second embodiment

[0050]In the second embodiment, as illustrated in FIGS. 9 and 10, the first boss groove 9a is formed so as to be inclined obliquely upward with increasing distance from the feeding roller 5. In the case that the first boss groove 9a in FIGS. 9 and 10 is formed, the angle formed between the sheet abutting surface 6b of the movable wall 6 and the sheet stacking surface 3a changes when the movable wall 6 moves, and the upper end of the sheet abutting surface 6b is always higher than a height H6 at the position in the standby state irrespective of a movement amount of the movable wall 6.

[0051]FIG. 11A illustrates the state in which the user sets the sheet S into the tray 3 in the second embodiment. At this point, the cam 7 abuts on the surface on the opposite side to the sheet abutting surface 6b of the movable wall 6. FIG. 11B illustrates the state in which the thin paper having the basis weight of 60 g / m2 is fed. At this point, the cam 7 separates from the movable wall 6, and the mova...

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PUM

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Abstract

One aspect of the present invention provides a sheet feeding device and an image forming apparatus, in which a sheet can stably be separated and fed irrespective of stiffness of the sheet. A movable wall includes a sheet abutting surface that separates the sheet one by one by abutting on the sheet, which is stacked on a tray and fed by a feeding roller. The movable wall is movable in a sheet feeding direction, and a force applying spring applies a force to the movable wall in a direction opposite to the sheet feeding direction. A support portion supports the movable wall such that the movable wall is movable, and such that the movable wall is sloped when abutting on the sheet, which is fed by a feeding roller, and moving on a downstream side in the sheet feeding direction against an applying force of a force applying spring.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a sheet feeding device and an image forming apparatus, particularly to a sheet feeding device and an image forming apparatus, in which a sheet is separated one by one using a separating slope.[0003]2. Description of the Related Art[0004]Conventionally, an image forming apparatus, such as a copying machine, a printer, and a facsimile machine, includes a sheet feeding device that feeds a sheet to an image forming portion, and a separating portion is provided in the sheet feeding device in order to separate the sheet one by one. For example, there is a separating portion including a slope separation system (see U.S. Pat. No. 5,622,364). In the slope separation system, a separating slope is provided on a leading end side of a tray on which the sheet is stacked, and the sheet fed by a feeding roller is pressed against the separating slope to separate the sheet one by one.[0005]Nowadays, there...

Claims

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Application Information

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IPC IPC(8): B65H1/12
CPCB65H3/0684B65H3/56B65H7/00B65H2220/01B65H2405/1134B65H2405/1136B65H2511/214B65H2515/30B65H2515/81B65H2701/171B65H2220/08B65H2220/11B65H3/5215
Inventor FURUSAWA, MOTOHIROFUJINUMA, YASUHITO
Owner CANON KK