PURPOSE: To improve the stability of transfer paper separation and the transfer efficiency, by chaning the discharge current of a corona discharger for transfer paper separation and/or the irradiation light of a pre-transfer photoreceptor exposure lamp on a basis of information of the developing current at the development time.
CONSTITUTION: The discharge current of a separating electrode 2 is controlled by a controlling circuit 14 on a basis of the output of a detecting circuit 11, which is obtained by converting the developing current of a toner developing equipment 8 to a voltage, to separate a transfer paper stably even if an original is changed to a photographic original and a character original. The separating electrode 2 is so controlled that a pre-transfer exposure lamp 16 is lit when the discharge current becomes a certain value or more, that is, when the potential of the surface of the photoreceptor becomes a certain voltage or more or the quantity of the light of the pre-transfer exposure lamp 16 is increased according as the developing current is increased. The quantity of the light of the pre-transfer exposure lamp 16 is switched, for example, in two stages, and thus, the transfer paper is separated stably to reduce the fatigue of the photoreceptor as much as possible.
MOTOHASHI MITSUO
NEMOTO SANJI
| JPS56104363A | 1981-08-20 | |||
| JPS5675679A | 1981-06-22 |