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Method of controlling driving of developing roller in image forming apparatus

A technology of an imaging device and a developing roller, which is applied to the equipment of the electric recording process applying the charge pattern, the electric recording process applying the electric charge pattern, the electric recording technique, etc., can solve the problem of poor toner durability and excessive toner. Aggregation etc.

Inactive Publication Date: 2007-06-20
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the developing roller is still unnecessarily driven during the time when the blank margin portion where no image is formed on the printing medium moves past the developing roller
This unnecessary operation of the developing roller results in excessive accumulation of toner, which forms a thicker film on the surface of the developing roller
Such unnecessary operation of the developing roller also wears down the cleaning blade for controlling the thickness of the toner film attached to the developing roller and deteriorates the durability of the toner

Method used

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  • Method of controlling driving of developing roller in image forming apparatus
  • Method of controlling driving of developing roller in image forming apparatus
  • Method of controlling driving of developing roller in image forming apparatus

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Embodiment Construction

[0015] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0016] A feature of the embodiment of the present invention is that the driving (rotation) time of the developing roller is the shortest because the developing roller is driven only during the time of developing the electrostatic latent image. To achieve this feature, an aspect of the invention includes determining in memory when the last portion of the virtual image reaches the developer roller to determine a drive stop point for the developer roller.

[0017] In order to fully explain this feature of the present invention, a schematic structure of an image forming apparatus used in an embodiment of the present invention will be described, and then a method of contro...

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Abstract

The invention discloses a method to control the driving of a developing roller includes controlling a driving stop point of the developing roller which is independently driven, wherein the driving stop point of the developing roller is determined by adding the print medium feed time from a virtual print medium start point to a virtual image end point and the time a photosensitive drum takes to rotate from an exposure point to a developing point on the photosensitive drum, so that the developing roller is driven only for the time during which an electrostatic latent image is developed.

Description

technical field [0001] The present invention relates to an image forming apparatus, and more particularly, to a method of controlling the driving of a developing roller to minimize the time during which the developing roller is driven during a printing operation. Background technique [0002] Generally, an electro-photosensitive image forming apparatus forms an electrostatic latent image corresponding to a desired image on a photosensitive medium using an exposure apparatus, develops the electrostatic latent image using a toner, and transfers the developed image to a printing medium. , and the image is fixed on the printing medium by heating and pressurizing the printing medium, thereby forming a desired image on the printing medium. The print medium may be paper, transparencies, and the like. An electrophotographic image forming apparatus generally includes a developing unit that stores toner. An electrostatic latent image is formed on a photosensitive medium. The develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08G03G15/04G03G15/00
CPCG03G15/0806
Inventor 崔得铉
Owner SAMSUNG ELECTRONICS CO LTD