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Image forming apparatus

An image and equipment technology, applied in the field of image forming equipment, can solve the problem that it is impossible to guarantee the contact pressure of the cleaning blade, and achieve the effect of high cleaning failure

Active Publication Date: 2017-04-19
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This only allows the selection of materials with a relatively low rubber hardness of 70°-75°, which can make it impossible to guarantee the abutment pressure required as a cleaning blade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture Embodiment 1-9

[0282]

[0283] For the cleaning blade, an elastomer blade made of polyurethane is dipped in an isocyanate-based treatment liquid to adjust the surface friction coefficient and surface elastic modulus.

[0284] Specifically, an elastomer blade made of polyurethane is dipped in a treatment liquid obtained by dissolving at least one selected from a fluorine-based polymer and a silicon-based polymer and added to an isocyanate component in a solvent and Properly refined. Elastomeric blades having physical properties shown in Table 1 below were manufactured by changing the addition amounts of the isocyanate component, fluorine-based polymer, and silicon-based polymer to thereby change the concentration of the treatment liquid.

[0285] [Table 1]

[0286]

[0287] The unit of surface elastic modulus is N / mm 2 .

[0288] ~Manufacture of toner~

[0289]

[0290] Sodium lauryl sulfate (0.7 parts) and ion-exchanged water (498 parts) were placed in a reaction vessel equipped w...

manufacture Embodiment 10

[0320]

[0321] As the cleaning blade of Manufacturing Example 10, the elastomer blade described in Example 2 in JP-A No. 2010-210879 was used as it was. That is, the elastomer blade of Example 10 was produced as follows.

[0322] -Urethane rubber

[0323] Urethane rubber having hardness of 69° and impact resilience of 49% (manufactured by Toyo Tire & Rubber Co., Ltd.)

[0324] The hardness of the urethane rubber was measured according to JIS K6253 with a durometer manufactured by Shimadzu Corporation. The sample is a laminate having a thickness of 6 [mm] or more obtained by laminating sheets having a thickness of about 2 [mm].

[0325] The impact resilience of the urethane rubber was measured with a RESILIENCE TESTER No. 221 manufactured by Toyo Seiki Seisaku-Sho, Ltd. according to JIS K6255. The sample is a laminate having a thickness of 4 [mm] or more obtained by laminating sheets having a thickness of about 2 [mm]. - Dipping solution

[0326] Isocyanate compound: MR...

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PUM

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Abstract

Image forming apparatus, including: image bearer; charging unit for electrically charging image bearer surface; developing unit for developing with toner, electrostatic latent image formed over image bearer by exposure unit for performing light exposure; transfer unit for transferring developed toner to receiving member; and cleaning unit for cleaning toner remaining over image bearer without being transferred, wherein the toner contains: external additives; and base particles made of at least binder resin and colorant, external additive content of the toner is from 4 to 7 parts by mass relative to 100 parts by mass of base particles, primary particles of at least one external additive have a number average particle diameter of 0.01 to 0.05 [mu]m, cleaning unit includes an elastic-body blade having surface elastic modulus of from 15 to 25 N / mm2 and surface friction coefficient of from 0.5 to 0.7 at an abutment part thereof abutting on image bearer.

Description

technical field [0001] The present invention relates to image forming apparatuses. Background technique [0002] Many image forming apparatuses configured to form an electrostatic latent image on an image carrier and develop the electrostatic latent image into a visible image with a developer, thereby obtaining a recorded image such as a copying machine, a printer, or a facsimile machine, employ powder toner as a developing agent (or as part of the developer) dry developing device. [0003] Further, the recent spread of electrophotographic color image forming apparatuses and the easy availability of digitized images have led to a demand for printed images with higher definition. [0004] Therefore, there are studies for pursuing higher resolution and higher grayscale properties in images, among which there are studies as improvement of toner for visualizing electrostatic latent images, in order to form high-definition images, Makes toner particles more spherical and smalle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G21/00G03G9/08G03G15/00
CPCG03G9/09716G03G9/09725G03G21/0011G03G9/08G03G21/00G03G21/1814
Inventor 中武直树山下刚司佐久间彻志吉瀬允纪野崎刚御厨义博石川义通山本淳史不破一兴深尾朋宽三木智晴
Owner RICOH KK
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