US 11,693,341 B2
Image forming apparatus
Satoshi Ishida, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 19, 2022, as Appl. No. 17/723,822.
Claims priority of application No. 2021-072939 (JP), filed on Apr. 22, 2021.
Prior Publication US 2022/0342351 A1, Oct. 27, 2022
Int. Cl. G03G 15/16 (2006.01); G03G 15/01 (2006.01); G03G 21/16 (2006.01); G03G 15/00 (2006.01)
CPC G03G 15/1665 (2013.01) [G03G 15/0131 (2013.01); G03G 15/1675 (2013.01); G03G 15/5054 (2013.01); G03G 21/168 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a transfer member configured to form a transfer portion where the toner image is transferred from said image bearing member onto a transfer material in contact with said image bearing member;
a moving portion configured to move said transfer member, relative to said image bearing member, to a plurality of positions including a contact position where said transfer member is contacted to said image bearing member to and a separated position where said transfer member is separated from said image bearing member;
a driving portion configured to drive said moving portion;
an applying portion configured to apply a voltage to said transfer member;
a first detecting portion configured to detect at least one of a voltage applied to said transfer member by said applying portion and a current flowing through said transfer member when the voltage is applied to said transfer member by said applying portion; and
a second detecting portion configured to detect a position of said transfer member,
wherein on the basis of a detection result of said first detecting portion acquired when a first test voltage is applied to said transfer member by said applying portion, said second detecting portion sets a second test voltage, and
wherein said second detecting portion detects the position of said transfer member on the basis of a detection result of a current value by said first detecting portion acquired when the second test voltage is applied to said transfer member by said applying portion.