US 11,054,786 B2
Image forming apparatus
Yuichiro Hirata, Susono (JP); Taku Watanabe, Susono (JP); Shunsuke Matsushita, Yokohama (JP); and Takayoshi Kihara, Suntou-gun (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 30, 2019, as Appl. No. 16/729,935.
Claims priority of application No. JP2019-001490 (JP), filed on Jan. 8, 2019.
Prior Publication US 2020/0218195 A1, Jul. 9, 2020
Int. Cl. G03G 21/00 (2006.01); G03G 15/16 (2006.01)
CPC G03G 21/0094 (2013.01) [G03G 15/1665 (2013.01); G03G 21/0011 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotatable image bearing member on which an electrostatic latent image is formed;
a charging member for charging a surface of the image bearing member;
an exposure unit that forms the electrostatic latent image by exposing the surface of the image bearing member charged by the charging member;
a developing apparatus which, in order to form a developer image by developing the electrostatic latent image formed on the surface of the image bearing member, supplies a developer containing a toner particle and an external additive externally added to the toner particle, the external additive having an opposite charging polarity to a regular charging polarity of the toner particle, to the image bearing member;
a cleaning member that contacts the surface of the image bearing member in order to remove the developer from the surface of the image bearing member;
a transfer member provided facing the image bearing member in order to transfer the developer image formed on the surface of the image bearing member onto a transfer subject material; and
a voltage application unit for applying a voltage to the transfer member,
wherein, (i) the developing apparatus supplies the developer to the image bearing member during an image non-formation period of a continuous printing process and (ii) the voltage application unit applies a voltage having an identical polarity to a voltage applied during the image formation operation for transferring the developer image onto the transfer subject material during the image non-formation period, the image non-formation period corresponding to a timing between page-unit image formation operations and serves as a lubrication operation for supplying a lubricant to the cleaning member.