Patent ID: 8270885
Filing Date: 2012-09-18
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: plural image bearers configured to bear toner images comprising a black toner image, which are developed with a two-component developer comprising a carrier and a toner including a binder resin and an additive; a receptor configured to receive the toner images; plural pressers each configured to press the receptor to each of the plural image bearers at a predetermined pressure, wherein the additive has a burial rate X indicated by the following formula not less than 40%: wherein A represents a BET specific surface area (cm2/g) of the toner and B represents a BET specific surface area (cm2/g) of the toner after the additive is buried, wherein one of the pressers pressing the receptor to the image bearer bearing the black toner image presses the receptor thereto at a pressure lower than those of the other pressers, wherein each of the pressers includes a pressing member contacting the receptor, configured to press the receptor to each of the image bearers downward in the vertical direction, wherein the predetermined pressure of each presser is generated by a weight of each presser, and wherein the weight of the plural pressers is different between two or more pressers.