Image forming apparatus

a technology of forming apparatus and forming tube, which is applied in the direction of transportation and packaging, thin material processing, and article separation, etc., can solve the problems of increasing the workload of cleaners and wasting toner, and achieves the effect of less workload on cleaners, less waste of toner, and simple structur

Inactive Publication Date: 2006-11-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The present invention provides an image forming apparatus that can achieve a less waste of toner and a less workload on cleaners with a simple structure.

Problems solved by technology

This leads to a waste of toner and an increase in workload of the cleaners.

Method used

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  • Image forming apparatus
  • Image forming apparatus
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Examples

Experimental program
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Embodiment Construction

[0037] Numerous exemplary embodiments of the present invention will now be described with reference to the drawings.

[0038]FIG. 1 schematically illustrates a color image forming apparatus, which is an example of an image forming apparatus according to an exemplary embodiment of the present invention. The image forming apparatus includes an image-forming unit 1, which includes image-forming device 1A to 1D respectively for four colors, which are yellow (y), magenta (M), cyan (C), and black (Bk). The image-forming device 1A to 1D respectively include photoconductive drums 10a to 10d, primary charge rollers 2a to 2d, exposure portions 3a to 3d, developing portions 11a to 11d, primary transfer rollers 53a to 53d, and cleaners 4a to 4d.

[0039] The image forming apparatus also includes a sheet cassette 8 defining a sheet container capable of holding sheets P to be fed, and a sheet feeder unit 5 configured to feed each sheet P contained in the sheet cassette 8. The sheet feeder unit 5 incl...

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PUM

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Abstract

An image forming apparatus includes a feeder unit configured to feed one or more sheets held in a sheet container, and a sheet sensor configured to detect whether or not there are any sheets in the sheet container. When a sheet is to be fed to an image-forming unit, the feeder unit preliminarily conveys the sheet in a sheet feeding direction by a predetermined distance from a held position in the sheet container so that a trailing end of the sheet passes a detecting position of the sheet sensor.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to image forming apparatuses that are capable of forming images on sheets. [0003] 2. Description of the Related Art [0004]FIG. 7 illustrates a conventional image forming apparatus. The image forming apparatus includes photoconductive drums 100a to 100d on which yellow (Y), magenta (M), cyan (C), and black (Bk) toner images can be formed, respectively. The toner images formed on the photoconductive drums 100a to 100d are primarily transferred onto an intermediate transfer belt 12 in sequence so as to become a full-color toner image. Developing portions 110a to 110d are provided for developing electrostatic latent images formed on the photoconductive drums 100a to 100d using toner so as to form the toner images on the photoconductive drums 100a to 100d. [0005] A sheet cassette 40 provided in the image forming apparatus is capable of holding sheets P therein. When one of the sheets P conta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65H5/00
CPCB65H1/04B65H5/34B65H2801/21B65H2801/06B65H2701/1313B65H2701/1311B65H2513/514B65H2513/512B65H2511/514B65H2511/22B65H7/20B65H7/18B65H2220/03B65H2220/02B65H2220/01
Inventor ISHIKAWA, JUNJI
Owner CANON KK
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