Developing unit

Details Developing unit Developing unit

2006-08-29

2009-12-01

Gary, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S227000

Reexamination Certificate

active

07627273

ABSTRACT:
A developing unit is provided with developers, toner supply pipes, a drive mechanism, a position holding mechanism, and a retraction mechanism. Each of the plurality of developers has a development roller that corresponds to a color. Each toner supply pipe has a toner supply port and supplies toner to one of the plurality of developers. The drive mechanism moves the toner supply pipes so that each toner supply pipe can be positioned at a toner supply position and a retraction position. The position holding mechanism restricts the movement of the toner supply pipes so that one of the toner supply pipes is positioned at the toner supply position. If the electric power is cut off such that one of the toner supply pipes is positioned at the toner supply position, then the retraction mechanism releases the restriction of movement of that toner supply pipe and positions that toner supply pipe at the retraction position.

REFERENCES:
patent: 7274899 (2007-09-01), Tomoe
patent: 10-198149 (1998-07-01), None

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