Copying machine having plural developing units

Details Copying machine having plural developing units Copying machine having plural developing units

1990-07-10

1993-01-05

Grimley, A. T.

Photocopying

Contact printing

Light boxes

365200, 365204, 365245, 365326, G03G 2100

Patent

active

051775301

ABSTRACT:
A copying machine provided removably with plural developing units containing different colors of toner. Control means of the copying machine detects the loading condition of the developer and inhibits the start of copying operation when at least one developing unit is not loaded into the copying machine. The control means further performs a quick toner supply control, a control for a request for change-over of a developing unit being supplied with toner, and a control for the indication of a residual quantity of toner. The developing unit change-over control is performed so that a developing unit drive mechanism is changed over after the developer so far used is recovered into the developing unit.

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