Image forming apparatus

Details Image forming apparatus Image forming apparatus

1989-03-29

1990-07-03

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355326, G03G 1501

Patent

active

049395483

ABSTRACT:
In an image forming apparatus, a support member attachably and detachably supporting a plurality of developing units is provided for moving the developing units upwardly and downwardly or along a common circular orbit by vertical or rotative movement. A vertical movement support member balances with balancers, while a rotary support member has rotative balance by mutual position of each developing unit. A lock member for locking a support member at a desired position and a sensor for detecting the movement of the support member when unlocked are actuated for judging an unbalanced state of the support member by a detecting signal of the sensor.

REFERENCES:
patent: 4697915 (1987-10-01), Hayashi et al.

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