Fold-enforcing assembly, post-processing apparatus, and image forming system

A fold-enforcing assembly comprising:

• a fold-enforcing device including:
• a pair of pressing members configured to nip and press a fold of a sheet bundle in a direction of thickness of the sheet bundle;
• a pressing mechanism configured to pressurize and depressurize the pair of pressing members in the direction of thickness;
• and
• a driver configured to drive the pressing mechanism;
• a moving device configured to move the fold-enforcing device in a direction of the fold;
• and
• control circuitry configured to:
• move, with the moving device, the fold-enforcing device in accordance with a size of the sheet bundle in the direction of the fold;
• adjust a pressing position from an end of the sheet bundle in the direction of the fold, the pressing position at which the pair of pressing members presses the sheet bundle;
• pressurize, with the pressing mechanism, the pair of pressing members in the direction of thickness to press a first end portion of the sheet bundle in the direction of the fold;
• move, with the moving device, the fold-enforcing device to a second end portion of the sheet bundle opposite the first end portion in the direction of the fold;
• and
• depressurize, with the pressing mechanism, the pair of pressing members in the second end portion.

A controller configured to control a moving device to move a fold-enforcing device, the fold-enforcing device including a pair of pressing members configured to nip and press a fold of a sheet bundle in a direction of thickness of the sheet bundle, a pressing mechanism configured to pressurize and depressurize the pair of pressing members in the direction of thickness, and a driver configured to drive the pressing mechanism, the controller comprising:

• control circuitry configured to,
• move, with the moving device, the fold-enforcing device in accordance with a size of the sheet bundle in the direction of the fold,
• adjust a pressing position in a direction of conveyance of the sheet bundle, the pressing position at which the pair of pressing members presses the sheet bundle,
• pressurize, with the pressing mechanism, the pair of pressing members in the direction of thickness to press a first end portion of the sheet bundle in the direction of the fold,
• move, with the moving device, the fold-enforcing device to a second end portion of the sheet bundle opposite the first end portion in the direction of the fold, and
• depressurize, with the pressing mechanism, the pair of pressing members in the second end portion.