Method of sensing a remaining amount of developer for a color im

Details Method of sensing a remaining amount of developer for a color im Method of sensing a remaining amount of developer for a color im

1989-12-04

1991-01-22

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118688, 118690, 355209, 355245, 355326, G03G 2100

Patent

active

049874497

ABSTRACT:
A remaining developer sensing method for an image forming apparatus operable with a plurality of replaceable developing units each storing a developer of different color maintains the amounts of developers of remaining in the individual developing units equal to each other at all times. An exclusive sensor responsive to the remaining amount of toner is mounted on the bottom of a toner hopper of each developing unit and outputs a toner absence signal when the amount of toner remaining in the associated developing unit becomes short. When the toner absence signal continuously appears over a predetermined period time, the operation of the apparatus is inhibited. The predetermined period time differs from one developing unit to another.

REFERENCES:
patent: 4032227 (1977-06-01), Hubbard et al.
patent: 4626096 (1986-12-01), Ohtsuka et al.
patent: 4666290 (1987-05-01), Yoshiura
patent: 4669856 (1987-06-01), Yamada

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