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Charged roller

A charging roller and conductivity technology, applied in the field of charging rollers, can solve problems such as reduced charging characteristics, easy residual toner, and changes in resistance value, and achieve the effect of maintaining charging characteristics and long-term charging characteristics

Active Publication Date: 2014-08-06
SYNZTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the conventional charging roller has the problem that the photoreceptor tends to retain toner or adhere to external additives.
If it is easy to adhere to external additives, etc., long-term use will cause a large amount of external additives to adhere, and the resistance value will change or deviate, and the charging characteristics will decrease.
Decreased charging characteristics lead to image defects in image forming apparatuses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089]

[0090]0.5 parts by mass of sodium trifluoroacetate as a conductivity imparting agent, 3 parts by mass of zinc white, 2 parts by mass of stearic acid, 1.5 Parts by mass of the vulcanizing agent was kneaded with a roll mixer, and press-molded on the surface of a mandrel having a diameter of 6 mm to obtain a roll having an elastic layer formed on the surface of the mandrel.

[0091]

[0092] Grind the roll with an abrasive tool, and use it after the size is met figure 2 The apparatus shown performs wet grinding to form irregularities extending in the circumferential direction so that the surface roughness in the axial direction is larger than the surface roughness in the circumferential direction.

[0093]

[0094] 100 parts by mass of ethyl acetate and 20 parts by mass of an isocyanate compound (MDI) were dispersed and mixed with a ball mill for 3 hours.

[0095]

[0096] The said roll was immersed for 30 second in the state which maintained the surface treatm...

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PUM

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Abstract

The invention relates to a charged roller. The invention provides the charged roller capable of maintaining the charge characteristic for a long time. The outer periphery of a spindle of the charged roller is provided with at least one conductive rubber elastic layer. The average roughness of ten points of the charged roller in the axial direction is Rz1, the average roughness of ten points of the charged roller in the circumferential direction is Rz2, the average distance between concave and convex parts of the charged roller in the axial direction is Sm1, and the average distance between concave and convex parts of the charged roller in the circumferential direction is Sm2. The surface state of the charged roller satisfies the following formula, and the microhardness of the charged roller is 48-60 DEG. In the formula [1], 1.00<Rz1 / Rz2<=2.00, 0<Sm1 / Sm2<=1.00, and 11Mum<Rz1.

Description

technical field [0001] The present invention relates to a charging roller used to impart uniform static electricity to photoreceptors and the like of image forming apparatuses such as electrophotographic copiers and printers, or ink jet copiers and printers. Background technique [0002] A charging roller used in image forming apparatuses such as electrophotographic copiers and printers is required to have a predetermined conductivity in addition to the property not to contaminate a photoreceptor or the like. [0003] However, the conventional charging roller has a problem that toner is likely to remain on the photoreceptor or an external additive is easily adhered. If the external additives and the like are easily adhered, a large amount of the external additives and the like are adhered during long-term use, and the resistance value changes or its variation occurs, and the charging characteristics are degraded. Deterioration of the charging characteristics leads to image ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/02
Inventor 大浦孝祐
Owner SYNZTEC