JP2007070119A5 - - Google Patents

Claims (7)

A binding unit that sandwiches and stacks the sheet bundle that is sequentially entered and stacked between the first binding unit and the second binding unit between the first binding unit and the second binding unit, and the first binding unit . A sheet processing apparatus comprising: an alignment unit configured to align a sheet that has entered between the binding unit and the second binding unit; and a control unit that controls the binding unit.
The control means causes the frontage between the first binding portion and the second binding portion of the binding means to wait at a first frontage distance until the final sheet of the sheet bundle enters between the binding portions, and the alignment The sheet processing apparatus is controlled to change to a second frontage distance before the start of the binding operation that is smaller than the first frontage distance before the final sheet aligning operation by the means is completed.   2. The sheet processing apparatus according to claim 1, wherein the control unit changes the second frontage distance in accordance with at least one binding condition of the number of sheets bundled, the bundle thickness, and the curl amount.   The sheet processing apparatus according to claim 2, wherein the control unit sets the second frontage distance to a minimum frontage distance at which a binding operation can be performed under the binding condition.   4. The image forming apparatus comprising: an image forming unit that forms an image on a sheet; and a sheet processing apparatus that performs processing on the sheet on which the image is formed. 5. An image forming apparatus comprising the sheet processing apparatus according to claim 1. An image forming apparatus comprising: an image forming unit that forms an image on a sheet; a sheet processing device that performs processing on the sheet on which the image is formed; and a control unit that controls the sheet processing device.
The sheet processing apparatus includes a binding unit that sandwiches and stacks sheet bundles that are sequentially entered and stacked between the first binding unit and the second binding unit between the first binding unit and the second binding unit. And an aligning means for aligning the sheet that has entered between the first binding portion and the second binding portion,
The control means causes the frontage between the first binding portion and the second binding portion of the binding means to wait at a first frontage distance until the final sheet of the sheet bundle enters between the binding portions, and the alignment An image forming apparatus that controls to change to a second frontage distance before starting the binding operation that is smaller than the first frontage distance before the final sheet aligning operation by the means is completed.   The image forming apparatus according to claim 5, wherein the control unit changes the second frontage distance in accordance with at least one binding condition of the number of sheets bundled, the bundle thickness, and the curl amount.   The image forming apparatus according to claim 6, wherein the control unit sets the second frontage distance to a minimum frontage distance at which a binding operation can be performed under the binding condition.