Image forming apparatus

Inactive Publication Date: 2010-12-30
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]An object of the present invention is to provide an image forming apparatus having a structure for suppressing an impact noise that occurs when a sheet is stopped by a pair of resist rollers.

Problems solved by technology

In the structure wherein a fed-out sheet is temporarily stopped immediately before the pair of resist rollers, when the sheet curves with its leading edge stopped by the pair of resist rollers, the sheet becomes wavy and hits against the guide plates, thereby making a noise.
In this case, if the sheet path defined by the guide plates is tight, when the sheet curves with its leading edge stopped by the pair of resist rollers, the flexure of the sheet cannot be absorbed in the sheet path.
Then, the sheet hits against the guide plates strongly and makes a big impact noise.
In this way, however, a multiple of resin films are required, and the number of necessary components increases.

Method used

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Examples

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Embodiment Construction

[0018]An image forming apparatus according to an embodiment of the present invention is hereinafter described with reference to the accompanying drawings. In the drawings, the same members and parts are provided with the same reference symbols, and repetitions of the same descriptions are omitted.

[0019]An image forming apparatus according to an embodiment of the present invention is described with reference to FIG. 1. The image forming apparatus is a tandem type color printer. The printer mainly comprises process units 110 (110y, 110m, 110c and 110k) for forming toner images of yellow (Y), magenta (M), cyan (C) and black (K) respectively, a laser scanning unit 120 and an intermediate transfer unit 130.

[0020]Each of the process units 110 comprises, in a housing shown by the dotted line in FIG. 1, a photosensitive drum 112, a charging roller 113, a developing device 114, a residual toner / charge cleaner, etc., and is capable of sliding in a direction perpendicular to the paper surface ...

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PUM

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Abstract

An image forming apparatus having a sheet feeding structure for feeding a sheet fed out by a feed-out roller to a pair of resist rollers via a pair of feed rollers, wherein after a leading edge of the sheet comes to the pair of resist rollers, the sheet temporarily curves in a sheet path, between guide members disposed to face to both sides of the sheet. One of the guide members that is disposed downstream from the pair of feed rollers has a convex and a concave. The convex protrudes almost to the normal of the nip portion of the pair of feed rollers. The concave is disposed upstream from the convex with respect to the sheet feeding direction.

Description

[0001]This application is based on Japanese Patent Application No. 2009-155375 filed on Jun. 30, 2009, the content of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an image forming apparatus, and more particularly to a sheet feeding structure in an image forming apparatus such as an electrophotographic copying machine.[0004]2. Description of Related Art[0005]In an image forming apparatus such as an electrophotographic copying machine or a printer, a sheet fed out by a feed-out roller is fed to a pair of resist rollers via a pair of feed rollers, and while the pair of resist rollers holds the leading edge of the sheet, the sheet temporarily curves in a sheet path between guide plates disposed to face to both sides of the sheet. This is to correct a possible skew of the sheet and to synchronize the feeding of the sheet with carrying of a toner image to a transfer position.[0006]In the structur...

Claims

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Application Information

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IPC IPC(8): B65H5/06
CPCB65H5/38B65H9/006B65H2404/611B65H2404/512B65H2404/511
Inventor HIRAMATSU, TORU
Owner KONICA MINOLTA BUSINESS TECH INC
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