Sheet processing apparatus having punching unit for punching sheets and image forming apparatus

A sheet processing apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a sheet length which is a length in the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to determine a first conveyance position which is a position in a width direction orthogonal to the conveyance direction when the sheet of the sheet length is conveyed by the conveyance unit, obtain size information of the sheet, determine, based on the size information, a second conveyance position which is a position in the width direction when the sheet is conveyed by the conveyance unit, and by comparing the first conveyance position and the second conveyance position, control whether or not to execute an avoidance process that causes the punching unit to move away from the sheet.

A sheet processing apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a sheet length which is a length in the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to obtain size information relating to a first sheet width which is a length of the sheet in a width direction orthogonal to the conveyance direction, determine, based on the sheet length, a second sheet width which is a length of the sheet in the width direction, and by comparing the first sheet width and the second sheet width, control whether or not to execute an avoidance process that causes the punching unit to move away from the sheet.

A sheet processing apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a first detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a first conveyance position which is a position in a width direction orthogonal to the conveyance direction of the sheet conveyed by the conveyance unit;
• a second detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a sheet length which is a length in the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to obtain information relating to a first sheet width which is a length of the sheet in the width direction, determine, based on the first sheet width, a second conveyance position which is a position in the width direction when the sheet is conveyed by the conveyance unit, determine, based on the sheet length, a second sheet width which is a length of the sheet in the width direction, and in order to control whether or not to execute an avoidance process which causes the punching unit to move away from the sheet, execute a comparison between the first sheet width and the second sheet width and a comparison between the first conveyance position and the second conveyance position.

An image forming apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• an image forming unit configured to form an image on the sheet conveyed by the conveyance unit;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a first conveyance position which is a position in a width direction orthogonal to the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to obtain size information of the sheet, determine, based on the size information, a second conveyance position which is a position in the width direction when the sheet is conveyed by the conveyance unit, and by comparing the first conveyance position and the second conveyance position, control whether or not to execute an avoidance process that causes the punching unit to move away from the sheet.

An image forming apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• an image forming unit configured to form an image on the sheet conveyed by the conveyance unit;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a sheet length which is a length in the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to determine a first conveyance position which is a position in a width direction orthogonal to the conveyance direction when the sheet of the sheet length is conveyed by the conveyance unit, obtain size information of the sheet, determine, based on the size information, a second conveyance position which is a position in the width direction when the sheet is conveyed by the conveyance unit, and by comparing the first conveyance position and the second conveyance position, control whether or not to execute an avoidance process that causes the punching unit to move away from the sheet.

An image forming apparatus, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• an image forming unit configured to form an image on the sheet conveyed by the conveyance unit;
• a punching unit configured to punch the sheet conveyed by the conveyance unit;
• a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet;
• a first detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a first conveyance position which is a position in the width direction orthogonal to the conveyance direction of the sheet conveyed by the conveyance unit;
• a second detection unit arranged on an upstream side of the conveyance path with reference to the punching unit, and configured to detect a sheet length which is a length in the conveyance direction of the sheet conveyed by the conveyance unit;
• and
• a control unit configured to obtain information relating to a first sheet width which is a length of the sheet in the width direction, determine, based on the first sheet width, a second conveyance position which is a position in the width direction when the sheet is conveyed by the conveyance unit, determine, based on the sheet length, a second sheet width which is a length of the sheet in the width direction, and in order to control whether or not to execute an avoidance process which causes the punching unit to move away from the sheet, execute a comparison between the first sheet width and the second sheet width and a comparison between the first conveyance position and the second conveyance position.