Cleaning bias control for an image forming apparatus

摘要

An image forming apparatus includes: an endless belt having an outer circumferential surface for conveying a recording sheet; a photosensitive member provided to face the outer circumferential surface of the endless belt; a cleaning member provided to face the outer circumferential surface of the endless belt and configured to clean the outer circumferential surface of the endless belt; and a control device configured to control a cleaning bias to be applied to the cleaning member such that while a portion of the outer circumferential surface of the endless belt, which has contacted the recording sheet since being cleaned by the cleaning member, faces the cleaning member, a second bias, which is larger than a first bias having been applied to the cleaning member before the corresponding portion faces the cleaning member, is applied to the cleaning member.

主权项

1. An image forming apparatus comprising:
an endless belt having an outer circumferential surface for conveying a recording sheet; a photosensitive member that is provided to face the outer circumferential surface of the endless belt; a sensor configured to detect a leading end of the conveyed recording sheet; a cleaning member that is provided to face the outer circumferential surface of the endless belt and that is configured to clean the outer circumferential surface of the endless belt; and a control device configured to control a cleaning bias to be applied to the cleaning member, wherein the control device is configured to control the cleaning bias so as to:
apply a first bias to the cleaning member before a portion of the outer circumferential surface of the endless belt, which has contacted the recording sheet since being cleaned by the cleaning member, faces the cleaning member; andapply a second bias, which is larger than the first bias, to the cleaning member while the portion of the outer circumferential surface of the endless belt, which has contacted the recording sheet since being cleaned by the cleaning member, faces the cleaning member, and wherein the control device is configured to change the cleaning bias from the first bias to the second bias when a first predetermined time elapses from a timing of detection of the leading end of the recording sheet by the sensor.