Photocopying – Contact printing – Light boxes
Patent
1988-11-18
1990-12-04
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355246, G03G 1508
Patent
active
049757423
ABSTRACT:
The toner density control device of the invention is adapted to an image forming apparatus in which a plurality of processes for image formation are executed, and includes a toner sensor for detecting toner density in a developing section of the image forming apparatus, toner supplying means for supplying toner to the developing section according to output of the toner sensor, and cancelling means for temporarily cancelling function of the toner supplying means or output of the toner sensor in response to switching of operations in the process for image formation. Even if a meachanical vibration is generated during switching of operations in the process for image formation, the function of the toner supplying means or the output of the toner sensor is temporarily cancelled, so that an erroneous detection of toner density or inappropiate toner density control based on the aforesaid errorneous detection can be avoided. Accordingly, it is possible to prevent such a drawback that the density of a formed image becomes too dark or too weak in places due to mechanical vibration in the process of the image formation.
REFERENCES:
patent: 4622916 (1986-11-01), Tanaka et al.
Tada Tomio
Takamatsu Junichi
Mita Industrial Co. Ltd.
Pendegrass Joan H.
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