TRANSFER DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME

摘要

A transfer device includes an image bearer to bear a toner image, a nip forming device to contact the image bearer to form a transfer nip, a transfer bias power source including a direct current (DC) power source and an alternating current (AC) power source electrically connected to each other to output a transfer bias including at least one of a DC bias and a superimposed bias to transfer the toner image from the image bearer onto a recording medium interposed in the transfer nip, a contact-and-separation device to cause the image bearer and the nip forming device to contact and separate from each other, and a controller to control the contact-and-separation device to increase a size of a space between the image bearer and the nip forming device upon transfer using the superimposed bias such that the space is larger than the space upon transfer using the DC bias.

主权项

1. A transfer device, comprising:
an image bearer to bear a toner image on a surface of the image bearer; a nip forming device to contact the image bearer to form a transfer nip between the nip forming device and the image bearer; a transfer bias power source including a direct current (DC) power source and an alternating current (AC) power source electrically connected to each other, to output a transfer bias including at least one of a DC bias and a superimposed bias in which a DC voltage and an AC voltage are superimposed to transfer the toner image borne on the image bearer onto a recording medium interposed between the nip forming device and the image bearer in the transfer nip; a contact-and-separation device to cause the image bearer and the nip forming device to contact and separate from each other; and a controller to control the contact-and-separation device to increase a size of a space between the image bearer and the nip forming device upon transfer using the superimposed bias such that the size of the space upon transfer using the superimposed bias is larger than a size of the space upon transfer using the DC bias.