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Belt meandering preventing device and image forming apparatus including the same

一种曲折、带宽的技术，应用在带曲折防止装置领域，能够解决难偏移等问题

Inactive Publication Date: 2011-05-25
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using the structures of JP2008-275800 and JP2005-338522, it is difficult to detect the deviation of the annular zone in the bandwidth direction with high detection resolution within a wide detection range

Method used

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  • Belt meandering preventing device and image forming apparatus including the same
  • Belt meandering preventing device and image forming apparatus including the same
  • Belt meandering preventing device and image forming apparatus including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[0048] The structure of a printer as an example of an electrophotographic image forming apparatus according to an embodiment of the present invention is described below.

[0049] figure 1 is a schematic diagram of the printer of this embodiment.

[0050] The printer includes two optical scanning units 1YM and 1CK and four process units 2Y, 2M, 2C and 2K, which form yellow (Y), magenta (M), cyan (C) and black (K) toner images, respectively . The printer also includes a paper feed path 30 , a pre-transfer conveyance path 31 , a manual paper feed path 32 , a manual paper feed tray 33 , a pair of resist rollers 34 , a conveyor belt unit 35 , a fixing unit 40 , a conveyance path switching unit 50 , and a paper ejection path 51 , the paper ejection roller pair 52, the paper receiving tray 53, the first paper feeding cassette 101, the second paper feeding casset...

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Abstract

A belt meandering preventing device includes a belt displacement detection unit detecting the amount of displacement in a belt width direction of an endless belt rotatably stretched over support parts; and a belt meandering correction unit correcting the displacement in the belt width direction of the endless belt based on the amount of displacement detected by the belt displacement detection unit. The belt displacement detection unit includes a moving part moving in association with the displacement of the endless belt or an edge of the endless belt in the belt width direction and optical sensors outputting signals with output levels corresponding to the proportions of the moving part in optical paths of the optical sensors. The optical sensors are arranged such that the output levels ofthe optical sensors change as the endless belt is displaced in the belt width direction in a predetermined high-resolution detection range.

Description

technical field [0001] Certain aspects of the present invention relate to a belt meandering preventing device and an image forming apparatus including the belt meandering preventing device. Background technique [0002] Certain types of image forming apparatuses such as copiers and printers use endless belts, such as intermediate transfer belts, photosensitive belts, or paper transfer belts, to form images. Such endless belts are usually stretched over two or more rollers including drive rollers. While the endless belt is running (being driven or rotated), the endless belt is often shifted in a direction orthogonal to its running direction (hereinafter referred to as the belt direction). Such offsets are referred to below as belt meanders. When an image is formed on the outer surface of the endless belt or on a recording medium placed on the outer surface of the endless belt, belt meandering causes deformation of the image. Also, when a multi-color image is formed by sequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/00
CPCG03G2215/00143G03G15/161G03G2215/0016G03G15/1615
Inventor 工藤宏一程岛隆广瀬雄一
Owner RICOH KK