Transfer omission detector in tranfer unit for image forming app

Details Transfer omission detector in tranfer unit for image forming app Transfer omission detector in tranfer unit for image forming app

1994-08-12

1996-08-13

Dang, Thu Anh

Photocopying

Contact printing

Light boxes

355208, 355276, G03G 1500

Patent

active

055461727

ABSTRACT:
When a transfer is to be performed, a setting device sets a transfer voltage value VTC, which is that at which optimum transfer is obtained, as well as a transfer assuring voltage value VAC which assures transfer. A constant-current source performs constant-current control in such a manner that the transfer voltage having the set value is applied to a transfer corona discharge device so that a constant transfer current I.sub.T will flow. As a result, the transfer corona discharge device charges printing paper to a polarity opposite that of the electric charge of toner by corona discharge, thereby transferring the toner image to the paper. A voltage detector detects a voltage V.sub.T applied to the transfer corona discharge device, and a comparator compares the detected voltage V.sub.T with the transfer assuring voltage V.sub.A. If the detected voltage V.sub.T is less than the transfer assuring voltage V.sub.A, then the comparator takes this as meaning that transfer omission has occurred, as the result of a discharge abnormality such as leakage, and issues an alarm ALM1.

REFERENCES:
patent: 4772918 (1988-09-01), Karasawa et al.
patent: 4797705 (1989-01-01), Nishioka
patent: 4890125 (1989-12-01), Egawa et al.
patent: 5155501 (1992-10-01), Fujita et al.
patent: 5278613 (1994-01-01), Bisaiji et al.
patent: 5287144 (1994-02-01), Takeda

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