Imaging apparatus

An imaging device and image technology, applied in electrography, optics, instruments, etc., can solve problems such as complex mechanisms, and achieve the effects of reducing the number of drives, easy layout, and long service life

Inactive Publication Date: 2003-12-03
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the image forming devices disclosed in Japanese Patent Application Publication No. 2001-242680 and Japanese Patent Application Publication No. 2000-181184 are still accompanied by a problem that these image forming devices require a complicated mechanism for making the respective The photoreceptor of the image is separated from the belt

Method used

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Embodiment Construction

[0030] The present invention will be described below through preferred embodiments of the present invention.

[0031] figure 2 and image 3 is a schematic cross-sectional view of a first embodiment of an image forming apparatus suitable for a color copying machine according to the present invention. figure 2 shows the state of imaging in color mode of operation, while image 3 A state in which imaging is performed in the black-and-white operation mode is shown.

[0032] refer to figure 2 and image 3, arranged in order horizontally: a photosensitive drum 11K adapted to carry a K-color (black) toner image formed thereon; and three photosensitive drums 11Y, 11M, and 11C adapted to be carried thereon to form Y color (yellow), M color (magenta), and C color (cyan) toner images. The three photosensitive drums 11Y, 11M, and 11C for color images are arranged at a higher height than the photosensitive drum 11K for black images. The endless intermediate transfer belt 20 is ar...

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PUM

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Abstract

An image forming apparatus has a black sensitized body and plural color sensitized bodies arranged in a row as well as a belt adapted to move round on a course, sequentially passing by or coming into contact with the plural sensitized bodies, of which the black sensitized body is located at an end of the row, a roll for causing the belt to come into contact with the black sensitized body and a retractable roll located between the color sensitized body disposed at the other end of the row of the sensitized bodies opposite to the black sensitized body and the color sensitized body immediately adjacent to the black sensitized body and adapted to shift from a position for holding itself in contact with the belt to a position for separating itself from the belt and vice versa to change the course of round movement of the belt.

Description

field of invention [0001] The present invention relates to an electrophotographic image forming apparatus usable for copiers, printers, and the like. Background technique [0002] Two main types of conventional full-color electrophotographic image forming devices include so-called four-cycle type image forming devices and so-called tandem type image forming devices. A four-cycle type electrophotographic image forming device has a photoreceptor and a developing device containing a given amount of toners of different colors. As the photoreceptor is driven to rotate, toner images of different colors are sequentially overlapped and formed on the photoreceptor, and are superimposedly transferred onto a transfer object to form a color image. On the other hand, a tandem type image forming apparatus has a given number of photoreceptors provided with respective developing devices of different colors. As the toner images formed on the respective photoreceptors are sequentially overl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/01G03G15/16
CPCG03G2215/0119G03G15/0136G03G15/00
Inventor 萩原和义石川雅
Owner FUJIFILM BUSINESS INNOVATION CORP
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