Photocopying – Contact printing – Light boxes
Patent
1988-02-29
1989-10-10
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355209, 355246, 355260, G03G 2100
Patent
active
048735493
ABSTRACT:
A device for detecting the life of a process unit which is detachably mounted in an image forming apparatus includes a sensor for detecting the density of the toner in the developing device and a signal detector receiving an output from the sensor and operable to determine whether the output exceeds or is less than a predetermined value during a predetermined time period which starts after a developing roller of the process unit starts rotating. A control is connected to the signal detector and is operable to effect different operating conditions depending on whether the output exceeds or is below the predetermined value, one of the operating conditions being an indication that the life of the process unit has expired and another of the operating conditions being an indication that the life of the process unit is unexpired.
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Williams, G. T., "Toner Control Interlocks", IBM Technical Disclosure Bulletin, vol. 17, No. 4, Sep. 1974, p. 1096.
Aikawa Yukihiro
Hirobe Junichi
Hori Kazuto
Tada Tomio
Takamatsu Junichi
Braun Fred L.
Mita Industrial Co. Ltd.
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