Patent ID: 6157794
Filing Date: 2000-12-05
Classification: G03G

Abstract:
An image forming apparatus comprising:a rotatable image bearing member;charging means for charging said image bearing member;first developing means for developing an electrostatic latent image formed on said image bearing member with two-component developer including magnetic carrier and nonmagnetic toner;second developing means disposed downstream of said first developing means in a rotational direction of said image bearing member for developing with magnetic toner, said second developing means including a magnetic member producing a magnetic force which acts on said magnetic toner, said magnetic member being moveable between a development operative position in which said second developing means performs a development operation with respect to said image bearing member and a development inoperative position in which said second developing means does not perform the development operation with respect to said image bearing member;transferring means for collectively transferring images of said nonmagnetic toner and said magnetic toner formed on said image bearing member onto a transfer material; anddetecting means for detecting an error of said image forming apparatus,wherein between a time when the error is detected by said detecting means and a time when a rotation of said image bearing member is stopped, there is a time period during which a voltage for preventing said magnetic carrier from adhering from said first developing means to said image bearing member is applied to first developing means and a time period during which said magnetic member is moved from said development operative position to said development inoperative position.