Patent ID: 8995851
Filing Date: 2015-03-31
Classification: G03G

Abstract:
1. A developing device, comprising: a developer container configured to contain a developer including toner; an agitation conveyance member configured to agitate and convey the developer in the developer container; a toner detection sensor configured to detect a toner concentration or a remaining amount of toner in the developer container; and a scraper, provided on the agitation conveyance member, configured to clean a detection surface of the toner detection sensor when the agitation conveyance member rotates, wherein the agitation conveyance member is configured to be rotatable forward during image formation to agitate and convey the developer in the developer container, and rotatable reversely when image formation is not performed, the scraper includes a first member that comes into contact with the detection surface of the toner detection sensor when the agitation conveyance member rotates forward, and a second member that comes into contact with the detection surface of the toner detection sensor when the agitation conveyance member rotates reversely, the first member has a wear resistance higher than that of the second member, and a coefficient of friction between the second member and the detection surface is higher than a coefficient of friction between the first member and the detection surface.