Image forming apparatus

摘要

An image forming apparatus includes an image carrier; a facing member facing the image carrier via a transfer position; a power supply to output a voltage between a first position on the image carrier side and a second position on the facing member side; a resistance detector to detect electrical resistance between the first position and the second position via the transfer position; and a controller to switch between a first transfer mode in which the power supply outputs a direct current voltage, and a second transfer mode in which the power supply outputs a superimposed voltage. When a toner image on the image carrier is transferred onto a recording medium at the transfer position, the controller selects either the first transfer mode or the second transfer mode. When the resistance detector detects the electrical resistance, the controller selects the first transfer mode.

主权项

1. An image forming apparatus, comprising:
an image carrier to bear a toner image; a facing member disposed opposite and facing the image carrier via a transfer position at which the toner image is transferred onto a recording medium from the image carrier; a power supply to output a voltage between a first position on the image carrier side from the transfer position and a second position on the facing member side from the transfer position; a resistance detector to detect electrical resistance between the first position and the second position via the transfer position; and a controller to selectively switch between a first transfer mode, in which the power supply outputs only a direct current voltage, and a second transfer mode, in which the power supply outputs a superimposed voltage in which an alternating current voltage is superimposed on a direct current voltage, wherein, when the toner image on the image carrier is transferred onto the recording medium at the transfer position, the controller selects either the first transfer mode or the second transfer mode, and when the resistance detector detects the electrical resistance between the first position and the second position via the transfer position, the controller selects the first transfer mode.