Image forming apparatus having an exchangeable unit exchange tim

Details Image forming apparatus having an exchangeable unit exchange tim Image forming apparatus having an exchangeable unit exchange tim

1989-05-31

1991-11-19

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355200, G03G 2100

Patent

active

050669788

ABSTRACT:
The image forming device of this invention is related to a device such as a duplicator, a printer, a facsimile or the like in which a printing operation is carried out by utilizing an electrophotographic recording system and an electrostatic recording system, wherein the device includes a plurality of consumable working parts including at least a developing unit, a drum unit, a fixing unit, and a transfer unit, and the device further includes a unit for integrating the working time of each of the working parts, a memory for storing the integrated working time of each working part, a lifetime setting unit in which a predetermined lifetime of each working part is set, and a generator for generating an exchange requirement signal for at least one of the working parts when the integrated working time of the working part reaches the lifetime of the part set in the lifetime setting unit, whereby an image forming device having a system in which these consumable working parts can be exchanged at correct intervals, regardless of the conditions of use, is provided.

REFERENCES:
patent: 4496237 (1985-01-01), Schron
patent: 4551000 (1985-11-01), Kanemitsu et al.
patent: 4687320 (1987-08-01), Nakanishi et al.
patent: 4751484 (1988-06-01), Matsumoto et al.
patent: 4851875 (1989-07-01), Tanimoto

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