IMAGE FORMING APPARATUS

Abstract: an image forming apparatus includes a replaceable roller member, an applying unit that applies voltage to the roller member, a current detecting unit that detects a current flowing in the roller member to which the voltage is applied, and a controlling unit. the controlling unit calculates a value of a slope of a current-voltage characteristic of the roller member on the basis of a first current detected when a first voltage is applied to the roller member and a second current that is detected when a second voltage is applied, and determines whether or not the roller member has been replaced on the basis of an amount of change from a value of a first slope calculated at a first timing and a value of a second slope calculated at a second timing later than the first timing.

Inventor(s): MASAKI HIROSE, MASAHIDE HIRAI

CPC Classification: G03G15/553 (ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY (information storage based on relative movement between record carrier and transducer ; static stores with means for writing-in or reading-out information ; recording of television signals ))

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