Electrophotography – Image formation – Development
Patent
1995-11-20
1997-09-09
Pendegrass, Joan H.
Electrophotography
Image formation
Development
430120, G03G 1508
Patent
active
056666250
ABSTRACT:
In an image forming apparatus, a developing device has a first developer carrier for depositing a developer thereon, a regulating member for regulating the amount of the developer deposited on the first developer carrier, and a second developer carrier having an elastic surface, and contacting the first developer carrier while biting into it by a predetermined amount. The developer is provided with a preselected degree of fluidity. Hence, even when the same portion of the surface of the second developer carrier runs a plurality of times past a position where the two developer carriers contact each other without any developer being fed from the second developer carrier to an image carrier, the first developer carrier can surely strip the developer from the second developer carrier. As a result, a developer on which a predetermined amount of charge is deposited is transferred from the first developer carrier to the second developer carrier. This successfully protects images from defects. Particularly, when the developer has a zinc stearate content of greater than 0.1 wt %, it is possible to prevent the developer from melting and adhering to a member which regulates the developer.
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Endoh Shuichi
Hosokawa Hiroshi
Komatsubara Satoru
Matsumae Iwao
Murakami Eisaku
Pendegrass Joan H.
Ricoh & Company, Ltd.
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