US 9,811,046 B2
Image forming apparatus
Yuuji Wada, Kanagawa (JP); Naohiro Kumagai, Kanagawa (JP); Seiichi Kogure, Kanagawa (JP); Junpei Fujita, Kanagawa (JP); Kazuki Yogosawa, Kanagawa (JP); Kenji Sugirua, Kanagawa (JP); Takehide Mizutani, Tokyo (JP); Tatsuya Ohsugi, Kanagawa (JP); Hiroyoshi Haga, Kanagawa (JP); and Hirokazu Ishii, Tokyo (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Yuuji Wada, Kanagawa (JP); Naohiro Kumagai, Kanagawa (JP); Seiichi Kogure, Kanagawa (JP); Junpei Fujita, Kanagawa (JP); Kazuki Yogosawa, Kanagawa (JP); Kenji Sugirua, Kanagawa (JP); Takehide Mizutani, Tokyo (JP); Tatsuya Ohsugi, Kanagawa (JP); Hiroyoshi Haga, Kanagawa (JP); and Hirokazu Ishii, Tokyo (JP)
Filed on Jun. 22, 2016, as Appl. No. 15/189,699.
Application 15/189,699 is a continuation of application No. 14/962,062, filed on Dec. 8, 2015, granted, now 9,395,658.
Claims priority of application No. 2014-248960 (JP), filed on Dec. 9, 2014; and application No. 2015-058377 (JP), filed on Mar. 20, 2015.
Prior Publication US 2016/0306317 A1, Oct. 20, 2016
Int. Cl. G03G 15/16 (2006.01); G03G 21/00 (2006.01)
CPC G03G 21/0005 (2013.01) [G03G 15/1665 (2013.01); G03G 15/1675 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotatable image bearer:
a toner image forming device to form a toner image on the image bearer;
a transfer device contacting a surface of the image bearer, to form a transfer nip between the transfer device and the image bearer;
a transfer bias power source to output a transfer bias to transfer the toner image from the image bearer onto a recording medium in the transfer nip; and
a cleaner disposed downstream from the transfer nip in a direction of rotation of the image bearer, to electrostatically attract and remove toner from the surface of the image bearer to a surface of the cleaner,
wherein the transfer bias includes an alternating current component, and
wherein the transfer bias power source outputs a bias including the alternating current component to the transfer nip when a region between recording media of the image bearer passes the transfer nip during a time period which a plurality of recording media are continuously conveyed to form images.