Image forming apparatus

摘要

In printing, a first power supply unit applies a transfer current with a polarity opposite to a charged polarity of toner to the transfer roller. A second power supply unit applies a toner scattering suppression current with a polarity opposite to the charged polarity of the toner to a stretching roller until a rear end of a sheet passes through a separation position after a front end of the sheet reaches the separation position. The first power supply unit applies a post-transfer current, which has a polarity opposite to the charged polarity of the toner and has an absolute value equal to or more than an absolute value of the toner scattering suppression current, to the transfer roller until the rear end of the sheet passes through the separation position after the rear end of the sheet passes through the nip position.

主权项

1. An image forming apparatus comprising:
an image carrier that carries a toner image; a conveying belt that forms a nip in contact with the image carrier and conveys a sheet via a nip position; a transfer roller that transfers the toner image to the sheet at the nip position; a stretching roller that stretches the conveying belt at a separation position which corresponds to a downstream side in a sheet conveyance direction of the nip position and at which the sheet is separated from the conveying belt; a first power supply unit that applies a transfer current with a polarity opposite to a charged polarity of toner to the transfer roller until a rear end of the sheet passes through the nip position after a front end of the sheet reaches the nip position; and a second power supply unit that applies a toner scattering suppression current with a polarity opposite to the charged polarity of the toner to the stretching roller until the rear end of the sheet passes through the separation position after the front end of the sheet reaches the separation position, wherein the first power supply unit applies a post-transfer current, which has a polarity opposite to the charged polarity of the toner and has an absolute value equal to or more than an absolute value of the toner scattering suppression current, to the transfer roller until the rear end of the sheet passes through the separation position after the rear end of the sheet passes through the nip position.