Image Forming Apparatus Provided with Cleaning Member Capable of Reliably Cleaning Image Bearing Member

摘要

An image forming apparatus includes: including: an image forming unit; and a controller. The image forming unit includes: an image bearing member; a charging member; a transfer member; and a cleaning member. The controller selectively applies first and second transfer biases to the transfer member. A first transfer current flows between the image bearing member and the transfer member upon application of the first transfer bias. A second transfer current flows therebetween upon application of the second transfer bias. The controller selectively applies first and second charging biases to the charging member. The image bearing member has a first surface potential upon application of the first charging bias, and a second surface potential upon application of the second charging bias. The controller applies the first charging bias when applying the first transfer bias, and applies the second charging bias when applying the second transfer bias.

主权项

1. An image forming apparatus comprising:
an image forming unit including:
an image bearing member having a surface and configured to carry a developer image on the surface;a charging member configured to apply an electric charge to the surface of the image bearing member;a transfer member configured to transfer the developer image carried on the surface of the image bearing member to a transfer medium; anda cleaning member configured to remove residual developer that remains on the surface of the image bearing member after the developer image has been transferred onto the transfer medium from the surface of the image bearing member; and a controller configured to selectively apply a plurality of transfer biases including a first transfer bias and a second transfer bias to the transfer member, a first transfer current flowing between the image bearing member and the transfer member when the first transfer bias is applied to the transfer member, a second transfer current larger than the first transfer current flowing between the image bearing member and the transfer member when the second transfer bias is applied to the transfer member, the controller being further configured to selectively apply a plurality of charging biases including a first charging bias and a second charging bias to the charging member, the image bearing member having a first surface potential when the first charging bias is applied to the charging member, the image bearing member having a second surface potential higher than the first surface potential when the second charging bias is applied to the charging member, wherein the controller applies the first charging bias to the charging member when applying the first transfer bias to the transfer member, and applies the second charging bias to the charging member when applying the second transfer bias to the transfer member.