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Printer charging unit

A technology for charging devices and printers, applied to corona discharge devices, circuits, electrical components, etc., can solve problems such as harmful to human body, high voltage, etc., and achieve the effects of easy processing, improved service life, and avoiding wear and tear problems

Inactive Publication Date: 2012-11-07
ZHUHAI BENMA PRINTMAX IMAGINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Corona wire charging requires a high voltage, so a large amount of ozone will be generated during the charging process, and it will be harmful to the human body when it accumulates to a certain extent

Method used

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Embodiment Construction

[0022] refer to Figure 1 to Figure 2 , the invention discloses a charging device for a printer, comprising a compression spring device and a charging roller 2 arranged in a gap with a photosensitive drum 1. The gap setting means that the photosensitive drum 1 and the charging roller 2 maintain a certain distance, and the photosensitive drum 1 and the charging The distance d between the rollers 2 is 0<d<0.1mm. As a preferred implementation distance of the present invention, the distance d between the photosensitive drum 1 and the charging roller 2 is preferably d=0.02mm. At this distance, the charging effect is good , and the processing accuracy is easy to grasp. In this application, the charging roller can be a metal charging roller or a conductive plastic charging roller or a conductive resin charging roller, and the conductive resin can be epoxy resin or urea-formaldehyde resin.

[0023] As shown in the figure, the two ends of the charging roller 2 are provided with a gap s...

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Abstract

The invention discloses a printer charging unit which is characterized by comprising a compressed spring device and a charge roller which is in clearance fit with a photosensitive drum, wherein the two ends of the charge roller are respectively provided with a clearance sleeve, the charge roller keeps a clearance with the photosensitive drum through the clearance sleeves, the clearance sleeves and the photosensitive drum are jacked to be closely contacted with each other through the compressed spring device, the space d between the photosensitive drum and the charge roller is larger than 0 and smaller than 0.1mm, and the absolute value of the charge voltage which is applied on the charge roller is smaller than 2000V. Accordingly, not only is the abrasion problem which is brought by the contact charging of a previous rubber charge roller and the photosensitive drum avoided, the service life of a product is prolonged, but also low voltage can be adopted to normally charge, and the defect that the environment and human bodies are harmed due to a great deal of ozone which is produced by overhigh voltage of corona charging is avoided; and moreover, the charge roller is easy to process, and has high precision.

Description

technical field [0001] The invention relates to a printer, in particular to a charging device for the printer. Background technique [0002] In electrostatic imaging equipment, such as laser printers and copiers, a complete imaging cycle is divided into charging, exposure, development, transfer, fixing, and cleaning. From this we can see that charging is the first step in imaging, and the quality of charging ultimately determines the quality of printing. Charging is the process of bringing a layer of electrostatic charge with uniform density and a certain surface potential on the surface of the photoconductor in a dark room. [0003] At present, the main way to charge the photoconductor is to charge the charging roller (such as image 3 shown) and corona charging (as Figure 4 shown) two methods: [0004] 1. Charging roller charging: The charging roller is composed of a metal core and an elastic rubber with certain conductivity coated on the metal core. When working, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/02
Inventor 曹国柱
Owner ZHUHAI BENMA PRINTMAX IMAGINE
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