Pretransfer corotron switching

Details Pretransfer corotron switching Pretransfer corotron switching

1974-07-25

1977-08-02

Hix, L. T.

Photocopying

Including fiber optics

96 1C, 355 14, G03G 1516

Patent

active

040392570

ABSTRACT:
An electrostatographic machine is provided with a manually operable switch for changing the output of a pre-transfer corona discharge device depending upon the contrast characteristic of an original document to be copied. If the pre-transfer device is energized by an A.C. signal biased to a preselected D.C. level, this D.C. bias level may be changed in accordance with contrast quality of the original document to vary the image density at which transition from transfer suppression to transfer enhancement takes place. Alternatively, the A.C. excitation level may be varied to change the point at which transition from transfer enhancement to transfer suppression occurs.

REFERENCES:
patent: 3124457 (1964-03-01), Schwartz
patent: 3322098 (1967-05-01), Pegram, Jr.
patent: 3778841 (1973-12-01), Gundlach et al.
patent: 3883242 (1975-05-01), Takahashi et al.

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