Patent ID: 7751742

Claim:
An image forming apparatus having a main body unit for forming an image on a recording medium, connectable to at least one post-processing unit for performing post-processing for the recording medium on which the image is formed, the image forming apparatus comprising: a current value acquiring portion for acquiring at least one of a calculated value of a current flowing through the main body unit calculated based on a relation between an operation and a consumption current flowing in the main body unit and based on a relation between an operation and a consumption current flowing in each post-processing unit supplied an electric power from the main body unit, and a measured value of the current flowing through the main body unit, as a value of the current flowing through the main body unit; and a control portion for selecting an operation mode from a plurality of operation modes each having a distinct value of current flowing through the main body unit, wherein a control unit selects an operation mode to optimally operate each post-processing unit from the plurality of operation modes so that the value of the current flowing through the main body unit becomes below or equal to an allowable current value, in a case when the value of the current acquired by the current value acquiring portion exceeds the allowable current, and operating each unit according to selected mode.