Patent ID: 7027746
Filing Date: 2006-04-11
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member for bearing an electrostatic image; developing means for developing the electrostatic image on said image bearing member with a developer including toner at a developing position, said developing means including: density detecting means for detecting a toner density on said developer carrying member of any said developing devices located at a position different from the developing position; toner replenishment control means, responsive to an output of said density detecting means, for controlling toner replenishment to said developing devices, and control means for controlling said detecting means to detect the toner density after executing a non-image forming rotation of said developer carrying member for a predetermined time period, in the case that said detecting means is to detect the toner density on said developer carrying member having passed through said developing position without rotation relative to said developing device during movement of said moving means.