Canon Kabushiki Kaisha

Kathuhito Kato

Kenji Kobayashi

Noriyoshi Ueda

Yuji Morishige

The present invention provides a sheet binding apparatus for effecting stapling operation by rotation of a motor including a current measuring device for measuring a current of the motor, a first timing output device for defining the timing of the stapling operation, a second timing output device for effecting the output at a different timing from an output timing of the first timing output device, a calculation device for measuring outputs of the current measuring device in response to signals from the first and second timing output devices to seek the difference between the measured values, a base current measuring device capable of setting a current value in advance on which the judgement of the presence/absence of a needle is based, and a discriminating device for comparing an output value from the calculation device with a set value of the base current value setting device to judge the presence/absence of the needle.

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Kawasaki, Japan

Kathuhito Kato