Patent ID: 8433221
Filing Date: 2013-04-30
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: at least either an image carrier or a facing member that faces the image carrier and forms a transfer region is configured by a belt member supported by a support rotating body or a rotating body, a distance between the image carrier and the facing member in the transfer region is adjusted by changing a rotation position of cams provided to a shaft part of the support rotating body or the rotating body, and, in the transfer region, a visible image on the image carrier is transferred to the facing member or to a recording sheet passed through between the image carrier and the facing member; and biasing means for biasing the facing member toward the image carrier, wherein the image forming apparatus is configured to execute an operation for increasing the distance by pushing back the facing member against a biasing force of the biasing means as rotation drive of a penetrating shaft member and the cams is stopped at a predetermined rotation angle, before the recording sheet enters between the image carrier and the facing member, wherein the support rotating body or the rotating body provided with the cams at the shaft part thereof is configured by at least a main body part that has a through-hole penetrating in a rotary shaft line direction at a rotation center position, and said penetrating shaft member that serves as the shaft part penetrating the through-hole of the main body part and spinning the main body part on a surface of the penetrating shaft member, and wherein, out of the entire region in a longitudinal direction of the penetrating shaft member, the cams are fixed to both end regions that are not located in the main body part, such that the cams are rotated integrally with the penetrating shaft member.