Image forming apparatus and process cartridge

An imaging device and image technology, applied in electrography, optics, instruments, etc., can solve problems such as cleaning faults, charging faults, and image density imbalance, and achieve temperature rise suppression, upper film formation suppression, and adjacent adjacency suppression area effect

Inactive Publication Date: 2014-08-27
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When filming occurs, failures such as uneven image density, cleaning failure, charging failure, etc.

Method used

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  • Image forming apparatus and process cartridge
  • Image forming apparatus and process cartridge
  • Image forming apparatus and process cartridge

Examples

Experimental program
Comparison scheme
Effect test

manufacture Embodiment 1

[0295] (Production Example of Polyester Resin)

[0296] First, 517 parts of bisphenol A ethylene oxide 2mol adduct, 317 parts of terephthalic acid, 101 parts of ethylene glycol and 65 parts of hydrogenated bisphenol A were injected into the In the reaction chamber of the tube, the product was concentrated and reacted at 170° C. under atmospheric nitrogen flow for 10 hours, and then concentrated and reacted at a reaction temperature of 210° C. for 5 hours. Then, the product was continuously reacted for 5 hours while dehydrating under a reduced pressure of 0-15 mmHg, followed by cooling to obtain a polyester resin (PE1). For the obtained polyester resin (PE1), the weight-average molecular weight (Mw) of the THF-soluble portion was 2,900; the acid value was 5KOHmg / g, the glass transition point (Tg) was 43°C, and the weight-average molecular weight and glass transition The dot ratio (Mw / Tg) was 67. Also, the molar ratio of the benzene ring frame to the 1,4-cyclohexylene frame wa...

manufacture Embodiment 2

[0304] (Production Example of Polyester Resin)

[0305] There are 613 parts of bisphenol A ethylene oxide 2mol adduct, 322 parts of terephthalic acid; 13 parts of ethylene glycol; and 52 parts of hydrogenated bisphenol A injection with cooling tube, stirrer and nitrogen introduction The reaction chamber of the tube, and polyester resin (PE2) was obtained in the same manner as in Production Example 1. For the polyester resin (PE2) obtained, the weight-average molecular weight (Mw) of the THF-soluble portion was 5,800; the acid value was 38KOHmg / g, the glass transition point (Tg) was 59°C, and the weight-average molecular weight and glass transition point The ratio (Mw / Tg) was 98. Also, the molar ratio of the benzene ring frame to the 1,4-cyclohexylene frame was 13.5, and the molar ratio of the benzene ring frame to the ester-bonded alkylene frame at both ends was 27.0.

[0306] (Manufacture example of toner)

[0307] There are 85 parts of polyester (PE2), 15 parts of prepoly...

manufacture Embodiment 3

[0309] (Production Example of Polyester Resin)

[0310] There are 548 parts of bisphenol A ethylene oxide 2mol adduct, 296 parts of terephthalic acid; 44 parts of ethylene glycol; and 113 parts of hydrogenated bisphenol A injection with cooling tube, stirrer and nitrogen introduction The reaction chamber of the tube, and polyester resin (PE3) was obtained in the same manner as in Production Example 1. For the obtained polyester resin (PE3), the weight-average molecular weight (Mw) of the THF-soluble portion was 3,300; the acid value was 7KOHmg / g, the glass transition point (Tg) was 43°C, and the weight-average molecular weight and glass transition The dot ratio (Mw / Tg) was 77. Also, the molar ratio of the benzene ring frame to the 1,4-cyclohexylene frame was 5.6, and the molar ratio of the benzene ring frame to the ester-bonded alkylene frame at both ends was 7.5.

[0311] (Manufacture example of toner)

[0312] There are 83 parts of polyester resin (PE3), 17 parts of prepoly...

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PUM

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Abstract

A disclosed image forming apparatus forms a toner image on a surface of a surface moving image bearing body and eventually transfers and fixes the toner image onto a recording medium to form an image on the recording medium and removes, by a cleaning apparatus, an adhered matter which is adhered to the surface of the image bearing body after the transferring. In the image forming apparatus, a glass transition temperature (Tg) of a toner is 40-60° C., and the cleaning apparatus causes a tip ridgeline portion of a blade member to be abutted against the surface of the image bearing body to remove the adhered matter from the surface of the image bearing body, and the tip ridgeline portion of the blade member is made of elastic rubber whose 100% modulus value at 23° C. is at least 6 MPa.

Description

technical field [0001] The present invention relates to an image forming apparatus such as a copier, a facsimile, a printer, and the like, and a process cartridge. Background technique [0002] There is known an image forming apparatus which forms an image by finally transferring a toner image formed on the surface of a surface-moving image carrier onto a recording medium to fix the transferred toner image and which removes the image-bearing image after the transfer. Adhesive substances on the surface of the body. [0003] As for the cleaning device, a cleaning blade technology is used which abuts the tip ridge portion (edge ​​portion) of the cleaning blade made of elastic rubber against the surface of the image carrier to block the toner, thereby removing the blocked toner. Regarding the cleaning blade of the related art, a single-layer blade member made of elastic rubber with low hardness is widely used. Also, a cleaning blade is known in which a high-hardness elastic ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G21/00G03G21/18
CPCG03G21/0011G03G21/0017
Inventor 渡边一彦多和田高明藤城宇贡菊地尚志
Owner RICOH KK
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