Patent ID: 8185039

Claim:
A sheet processing apparatus comprising: a sheet stacking portion on which a sheet bundle is stacked; a sheet bundle moving portion which moves the sheet bundle stacked on the sheet stacking portion; a stapler which performs a stapling process at a plurality of staple positions of the sheet bundle stacked on the sheet stacking portion; a stapler moving device which moves the stapler; and a controller which controls the sheet bundle moving portion and the stapler moving device to perform the stapling process at the plurality of staple positions of the sheet bundle by a movement of the stapler and the sheet bundle, the controller controls the sheet bundle moving portion and the stapler moving device so that a moving speed of the sheet bundle at which a number of sheets in the sheet bundle to be moved by the sheet bundle moving portion is lower than a predetermined number value or a weight of the sheet bundle to be moved by the sheet bundle moving portion is lower than a predetermined weight value is set faster than a moving speed of the sheet bundle at which the number of sheets in the sheet bundle to be moved by the sheet bundle moving portion is not lower than the predetermined number value or the weight of the sheet bundle to be moved by the sheet bundle moving portion is not lower than the predetermined weight value.