Image forming apparatus with power source control

Details Image forming apparatus with power source control Image forming apparatus with power source control

1994-08-10

1996-01-30

Royer, William J.

Photocopying

Contact printing

Light boxes

355208, 355274, 355285, 355309, G03G 2100

Patent

active

054884578

ABSTRACT:
In an image forming apparatus which adjusts transferring condition according to an output signal from a moisture sensor, a control circuit has an off-time estimation device for estimating a power source interruption period from a surface temperature of a fixing roller and heat radiation elapsed time characteristics of the fixing roller and a time measuring device for measuring the time elapsed after the loading of a sheet feeding cassette. The control circuit further includes a moisture content converter for converting a total elapsed time after loading the sheet feeding cassette and for converting humidity into moisture content data of the transferring sheets. The control circuit controls the output from a high voltage power source of the apparatus, based on the moisture content data.

REFERENCES:
patent: 4134147 (1979-01-01), Watanabe
patent: 4610530 (1986-09-01), Lehmbeck et al.
patent: 4912515 (1990-03-01), Amemiya et al.
patent: 5119141 (1992-06-01), Bhagat
patent: 5291253 (1994-03-01), Kumasaka et al.

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