Image forming system

An image forming system including an image forming apparatus, and a post-processing apparatus which is connected to a downstream side of the image forming apparatus in a conveyance direction of a sheet and which performs punching processing of forming a punch hole in a sheet conveyed along a conveyance path from the image forming apparatus, the image forming system comprising:

• a punch unit, provided in the post-processing apparatus, which includes a punch member that performs the punching processing on the sheet conveyed from the image forming apparatus while the punch member rotates;
• a surface property detection unit configured to detect a surface property of the sheet conveyed along the conveyance path toward the punch unit;
• a basis weight detection unit configured to detect a basis weight of the sheet conveyed along the conveyance path toward the punch unit;
• and
• a control unit configured to:
• control conveyance of the sheet such that the sheet is conveyed to the punch unit at a conveyance speed corresponding to the surface property detected by the surface property detection unit,
• control rotation of the punch member such that the punch member performs the punching processing on the sheet conveyed from the image forming apparatus while the punch member rotates at a rotation speed corresponding to the conveyance speed, and
• control discharge of the sheet such that the sheet is discharged without the punching processing being performed on the sheet, in a case where the basis weight detected by the basis weight detection unit is greater than a basis weight threshold.