Developer supply device and image forming apparatus

Details Developer supply device and image forming apparatus Developer supply device and image forming apparatus

2011-08-02

2011-08-02

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Development

C399S119000

Reexamination Certificate

active

07991335

ABSTRACT:
An apparatus includes an upstream transport surface TSa which, while facing a circumferential surface DS of a developing roller, is disposed upstream of an area (developing area) in the vicinity of a latent image forming surface LS, and a downstream transport surface TSb which, while facing the circumferential surface, is disposed downstream of the developing area. The apparatus forms electric fields on the upstream and downstream transport surfaces for moving a charged developer T from an upstream side toward a downstream side. In the apparatus, the transport speed of developer on the upstream transport surface is higher than that on the downstream transport surface. As a result, there can be lowered a speed at which the developer which has not adhered to the circumferential surface and has reached a downstream end portion of the upstream transport surface flies out toward the vicinity of the developing area. Also, there can be avoided a problem in that the developer stagnates at an upstream end portion of the downstream transport surface with a resultant hindrance to collection of the developer.

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International Search Report: PCT/JP2007/065983, Mailing Date: Sep. 25, 2007.

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