US Patent No. 9,280,098

IMAGE FORMING APPARATUS


Patent No. 9,280,098
Issue Date March 08, 2016
Title Image Forming Apparatus
Inventorship Naoki Kanno, Fujisawa (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,280,098

1. An image forming apparatus comprising:
an image bearing member that bears a toner image;
an intermediate transfer member that is rotatable and transfers a toner image transferred from the image bearing member at
a primary transfer part onto a transfer material at a secondary transfer part;

a switching unit that can switch polarities of potentials of the intermediate transfer member which are generated at the primary
transfer part and the secondary transfer part in synchronization; and

a control unit that executes adjustment processing in which a potential having a first polarity opposite to the polarity upon
the transfer is to be generated at least one of the primary transfer part and the secondary transfer part,

wherein the control unit controls the switching unit in a manner that, in a case where the adjustment processing is performed
in a course of continuous image formation on a plurality of transfer materials conveyed to the secondary transfer part, a
timing for generating the potential having the first polarity corresponds to a timing at which toner images are not transferred
at both of the primary transfer part and the secondary transfer part.