Image forming system

摘要

An image forming apparatus includes an image bearer; a transfer rotator to contact the image bearer to form a transfer nip therebetween; a bias application device to apply, to the transfer rotator, a transfer bias, a cleaning bias to remove toner adhering to the transfer rotator, and a non-image area bias smaller in absolute value than the cleaning bias; and a controller to control the bias application device and set a sheet feeding interval according to a predetermined condition. When the sheet feeding interval exceeds a predetermined threshold, the controller causes the bias application device to apply, to the transfer rotator, the non-image area bias for an application time Z and the cleaning bias for a time X−Z within the sheet feeding interval when X represents the sheet feeding interval, and the application time Z is increased as the sheet feeding interval is increased.

主权项

1. An image forming apparatus comprising:
an image bearer to rotate and bear a toner image; a transfer rotator to rotate and contact the image bearer to form a transfer nip therebetween; a bias application device to apply multiple biases to the transfer rotator, the multiple biases including:
a transfer bias to transfer the toner image from the image bearer onto a sheet transported to the transfer nip,a cleaning bias to remove toner adhering to the transfer rotator, anda non-image area bias smaller in absolute value than the cleaning bias; and a controller to control the bias application device and set a sheet feeding interval according to a predetermined condition, the sheet feeding interval being a period from when the sheet is sent out from the transfer nip to when a subsequent sheet is fed to the transfer nip while multiple sheets are successively fed to the transfer nip, wherein, when the sheet feeding interval exceeds a predetermined threshold, the controller causes the bias application device to apply the non-image area bias for an application time Z within the sheet feeding interval and apply the cleaning bias for an application time expressed as X−Z within the sheet feeding interval, X representing the sheet feeding interval, and the controller sets the application time Z to an increased length of time as the sheet feeding interval is increased, and wherein the application time of the cleaning bias is a fixed value regardless of a length of the sheet feeding interval.