Patent ID: 7756446
Filing Date: 2010-07-13
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a rotatable photosensitive member; a charging device configured to electrically charge said photosensitive member; an exposure device configured to expose said photosensitive member, after being electrically charged, to form an electrostatic image; a developing device configured to develop the electrostatic image with toner to form a toner image; a brush, disposed in contact with said photosensitive member on an upstream side of said charging device with respect to a rotational direction of said photosensitive member; an applying device configured to apply a bias to said brush, for collecting toner remaining on said photosensitive member in said developing device; a counter configured to count an integral of a number of image formations; a humidity sensor; and a controller configured to control said applying device so as to apply a pulse-like bias to said brush during a toner discharging process so that the toner collected in said brush is discharged toward said photosensitive member, said controller configured to change a number of pulses of the bias applied to said brush on the basis of a humidity obtained by said humidity sensor and the integral of a number of image formations.