Life detecting system for detecting the useful life of a process

Details Life detecting system for detecting the useful life of a process Life detecting system for detecting the useful life of a process

1997-03-28

1998-06-23

Royer, William J.

Electrophotography

Diagnostics

Consumable

G03G 1500

Patent

active

057714207

ABSTRACT:
The present invention provides a life detecting system that accurately detects the end of the useful life of a process unit used in electrophotographic printers. The life detecting system comprises a RAM that stores a count of the number of driving pulses generated at an exposure unit and a ROM that stores a predetermined reference count that represents the useful life of the process unit in terms of a driving pulse count. The system indicates that the end of the useful life of the process unit has been reached when it determines that the count stored in the RAM is greater than or equal to the predetermined reference count stored in the ROM.

REFERENCES:
patent: 4851875 (1989-07-01), Tanimoto
patent: 5572292 (1996-11-01), Chatani et al.

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