Patent ID: 8023840

Claim:
An image forming apparatus comprising: a rotatable image bearing member; toner image forming means for forming a toner image on said image bearing member, wherein said toner image forming means is capable of forming a toner image having a predetermined width measured in an axial direction of a rotational axis of said image bearing member at each of different positions; a transfer member, pressed against said image bearing member, for forming a transfer portion for transferring the toner image onto the transfer material from said image bearing member; a current detector for detecting a current flowing through the transfer member; a calculating portion for calculating a resistance difference in said transfer member with respect to the axial direction, on the basis of outputs of said current detector for the toner images at the different positions when the toner images pass through the transfer portion; and an output portion for outputting an abnormality on the basis of an output of said calculating portion.