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Image forming device

An image and image-carrying technology, which is applied in the fields of electrical recording technology using charge graphics, equipment using electrical recording technology using charge graphics, and electrical recording technology. It can solve color shift, chemical cost, slow first print, etc. question

Inactive Publication Date: 2009-01-28
RICOH KK
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

At this time, it takes a certain amount of time to reach the target speed. During this time, that is, before the vibration converges, a transfer is started, and adverse phenomena such as color shift will occur.
[0008] In order to avoid the above-mentioned bad phenomenon, methods such as delaying the first transfer time can be adopted, but this will cause the problem that the first print is slow

Method used

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Embodiment Construction

[0030] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, although various limitations are made to the constituent elements, types, combinations, shapes, relative configurations, etc., these are only examples, and the present invention It is not limited to this.

[0031] FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.

[0032] The image forming apparatus 101 is provided with a plurality of image forming units, in this embodiment, four image forming units 51Y, 51C, 51M, and 51K. The image forming units 51Y, 51C, 51M, and 51K form images electrophotographically using toners of different colors, where Y represents yellow, C represents cyan, M represents magenta, and K represents black. Among them, for example, the image forming section 51Y is provided with a photoreceptor drum 10Y as an ...

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Abstract

To prevent color shifts in a toner image, without delaying the first printing process by making the roller revolution reach the target speed soon after the start, when feedback-controlling the revolution of the rollers driving the image carrier belt. The control unit 3 finds the speed of the intermediate transfer belt 12, by obtaining the angular speed of the driven roller 16 from the output of a rotation sensor, and feedback-controls the motor 4, based on the obtained speed to maintain the speed of the intermediate transfer belt 12 constant. It uses feedback-control coefficients different for the time immediately after the start of the driven roller 16 to a certain time later and for the time after a fixed period.

Description

technical field [0001] The present invention relates to an electrophotographic image forming apparatus. Background technique [0002] Toner images of different colors (cyan, magenta, yellow, black) are respectively formed on several photosensitive drums, the intermediate transfer belt moves along the photosensitive drums as an image carrier, and the toners of each color The images are sequentially superimposed and transferred on the intermediate transfer belt to form a color image. For such an image forming device, refer to, for example, Japanese Patent Laid-Open No. 10-268595 (hereinafter referred to as "Patent Document 1"), or Japanese Patent Laid-Open No. 2004 - Publication No. 109744 (hereinafter abbreviated as "Patent Document 2"). [0003] Patent Document 1 discloses a technology capable of suppressing the vibration of the intermediate transfer belt caused by the impact of external force so that the intermediate transfer belt can move stably. [0004] Patent Document...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G21/14G03G15/16G03G15/01
Inventor 冈部将二
Owner RICOH KK
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