Sheet processing apparatus

A sheet processing apparatus that processes a sheet supplied from an image forming apparatus, comprising:

• a saddle folding unit configured to fold and discharge the sheet supplied from the image forming apparatus;
• and
• an assisting mechanism arranged in a sheet carrier path extending from the image forming apparatus to the saddle folding unit and configured to form a folding line on the sheet in a first direction orthogonal to a direction of the carrying of the sheet in order to assist folding of the sheet, the assisting mechanism has a pad arranged parallel to the direction of movement of the moving body, and moves the moving body while pushing the sheet to the pad by the roller blade,
• wherein the pad has a V-shaped groove at a position facing the circumferential surface of the roller blade along the first direction.

A sheet processing apparatus comprising:

• a saddle folding unit configured to fold and discharge the sheet supplied form the image forming apparatus;
• an assisting mechanism arranged in a sheet carrier oath extending from the image forming apparatus to the saddle folding unit and configured to be able to form a folding line on the sheet in a first direction orthogonal to a direction of the carrying of the sheet in order to assist folding of the sheet;
• a control unit configured to control operation of the assisting mechanism in accordance with the number of the sheets;
• wherein the saddle folding unit can bundle plural sheets and fold them, and
• the control unit controls the assisting mechanism, and forms the folding line on a predetermined number of sheets in the case where the number of sheets forming the bundle of sheets exceeds a present number of sheets.

A sheet processing apparatus that processes a sheet supplied from an image forming apparatus, comprising:

• a saddle folding unit configured to fold and discharge the sheet supplied from the image forming apparatus;
• an assisting mechanism arranged in a sheet carrier path extending from the image forming apparatus to the saddle folding unit and configured to be able to form a folding line on the sheet in a first direction orthogonal to a direction of the carrying of the sheet in order to assist folding of the sheet;
• and
• a control unit configured to control operation of the assisting mechanism in accordance with page of the sheets,
• wherein the saddle folding unit can bundle plural sheets and fold them, and
• the control unit controls the assisting mechanism and forms the folding line on the sheets other than a first page and a last page forming the bundle of sheets.

A sheet processing apparatus that processes a sheet supplied from an image forming apparatus, comprising:

• a saddle folding unit configured to fold and discharge the sheet supplied from the image forming apparatus;
• an assisting mechanism arranged in a sheet carrier path extending from the image forming apparatus to the saddle folding unit and configured to be able to form a folding line on the sheet in a first direction orthogonal to a direction of the carrying of the sheet in order to assist folding of the sheet;
• a first control unit configured to control operation of the assisting mechanism;
• and
• a second control unit configured to control the saddle folding unit,
• wherein the second control unit performs control in order to discharge the sheet on which the folding line is formed by the assisting mechanism, without performing the folding processing, in accordance with the need.