Ricoh Company, Ltd.

Norihisa Masamura

Yoshihide Sugiyama

Masatoshi Hosoi

Mitsuru Ichikawa

A sheet processing apparatus for punching a sheet having a detachable punching unit for accomplishing wide varieties of combinations of punching conditions such as a number of the hole, diameter of the hole, and a position of the hole at a sheet. A sort of the punching unit which is mounted to the apparatus is recognized by a recognition device and one of a sheet conveying speed, a punching speed, and a punch operation timing is controlled by a controller in accordance with a condition predetermined for each sort of the punching unit which is recognized by the recognition device.

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Mizunami, Japan

Norihisa Masamura