Developing device and image forming device

A developing device and image technology, which are applied in the direction of an electric recording process applying a charge pattern, equipment and instruments for an electric recording process applying a charge pattern, etc. Changes in charged power, etc.

Inactive Publication Date: 2009-01-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The growing developer ball falls to the downstream side of the return plate 103 due to its own weight, and therefore, a developer circulation path toward the developer supply unit cannot be formed in the container 104
Also, the number of on / off times of the developer magnetic permeability sensor provided at the bottom of the container is increased, thereby increasing the variation in the charge amount of the developer

Method used

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  • Developing device and image forming device
  • Developing device and image forming device
  • Developing device and image forming device

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0080] The present invention will be described below with reference to the drawings.

[0081] FIG. 1 is a cross-sectional view showing the structure of a developing device according to the present invention.

[0082] The developing device includes: a container 1 for storing a two-component developer; a developing roller 3 for transferring the developer to an electrostatic latent image on a photosensitive drum 2 and developing the electrostatic latent image; A control member 4 for the amount of developer conveyed to the electrostatic latent image; a scraper 5 facing the developing roller 3 with a second gap G2 larger than the first gap formed between the developing roller 3 and the controlling member 4 a gap G1, the scraping member 5 controlling the layer thickness of the developer delivered to the first gap G1 to scrape the developer; a return plate 6 for returning the excess developer controlled by the control member 4 away from the control member 4; and Stirring roller 7 th...

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PUM

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Abstract

The invention discloses a developing device, which comprises the following parts: developing rod, which possesses magnetic rod to transmit developing agent and develops electrostatic latent image; control part, which controls developing agent quantity from developing rod to electrostatic latent image; reflux board, which refluxes excessive developing agent out of control part, scraping and erasing part, which is set as the opposite surface developing rod of first gap and second gap limited by developing rod and control part and transmits the scraping and erasing to the developing agent of first gap, wherein the scraping and erasing part proceeds positive charging on the developing agent of initial charging.

Description

technical field [0001] The present invention relates to a developing device used in an image forming apparatus employing an electrophotographic system such as a copier, a printer, and a facsimile, and to an image forming apparatus. Background technique [0002] Figure 13 is a cross-sectional view showing the structure of a conventional developing device. [0003] A developing device used in an image forming apparatus employing an electrophotographic system such as a copying machine includes: a developing roller 101 having a magnetic roller 100 that conveys a two-component developer and for developing an electrostatic latent image carried on a photosensitive drum; A control member 102 for the amount of developer conveyed by the roller 101 to the electrostatic latent image; a return plate 103 for recirculating excess developer controlled by the control member 102 to exit the control member 102; a container 104 containing the developer; and for agitation A stirring roller 105...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/09
Inventor 冨田章嗣西野俊夫恩田裕若林雄石井洋
Owner SHARP KK
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