Image Forming Apparatus

摘要

An image forming apparatus includes an image carrier, a charging member, a transfer member, a cleaning member and a control device configured to switch a first mode and a second mode. When executing the second mode, the control device applies a second charging bias having the same polarity as a first charging bias and having an absolute value smaller than the first charging bias to the charging member, applies a second transfer bias having the same polarity as a first transfer bias and having an absolute value smaller than the first transfer bias to the transfer member, and applies a second cleaning bias having the same polarity as the charged polarity of the toner to the cleaning member and sets a potential difference between a surface potential of the image carrier and the second cleaning bias within a predetermined range.

主权项

1. An image forming apparatus comprising:
an image carrier configured to carry a toner image thereon; a charging member configured to charge a surface of the image carrier; a transfer member configured to transfer the toner image from the image carrier to a transfer medium; a cleaning member configured to remove and hold an attached matter, which is attached to the image carrier, after the toner image has been transferred from the image carrier to the transfer medium; and a control device configured to switch a first mode and a second mode by controlling a charging bias applied to the charging member, a transfer bias applied to the transfer member and a cleaning bias applied to the cleaning member, wherein the first mode is a mode of forming an image, and wherein the second mode is a mode of returning the attached matter held on the cleaning member to the image carrier, wherein in a case of executing the first mode, the control device is configured to:
apply a first charging bias having the same polarity as a charged polarity of toner to the charging member;apply a first transfer bias having a polarity opposite to the charged polarity of the toner to the transfer member; andapply a first cleaning bias having a polarity opposite to the charged polarity of the toner to the cleaning member, and wherein in a case of executing the second mode, the control device is configured to:
apply a second charging bias having the same polarity as the first charging bias and having an absolute value smaller than the first charging bias to the charging member;apply a second transfer bias having the same polarity as the first transfer bias and having an absolute value smaller than the first transfer bias to the transfer member; andapply a second cleaning bias having the same polarity as the charged polarity of the toner to the cleaning member and set a potential difference between a surface potential of the image carrier and the second cleaning bias within a predetermined range.