Sheet processing apparatus, sheet laminator, image forming apparatus, and image forming system

A sheet processing apparatus comprising:

• a sheet separator device configured to:
• separate two sheets of a two-ply sheet, in which the two sheets are overlapped and bonded together at a bonding portion, to perform a sheet separating operation;
• and
• insert a sheet medium between the two sheets separated from each other to perform a sheet inserting operation, the sheet medium to be conveyed in a conveyance direction toward the sheet separator device;
• a position detector device configured to:
• detect an amount of a positional deviation of the two-ply sheet in a width direction orthogonal to the conveyance direction;
• and
• detect an amount of a positional deviation of the sheet medium in the width direction;
• a position adjuster device configured to adjust the positional deviation of the two-ply sheet in the width direction, before the sheet separating operation, based on the amount of the positional deviation of the two-ply sheet detected by the position detector device;
• a take-up roller configured to take up one of the two sheets of the two-ply sheet subjected to the sheet separating operation;
• and
• a take-up assembly mechanism configured to move the take-up roller in the width direction,
• wherein the position adjuster device is further configured to cause the positional deviation of the two-ply sheet in the width direction to be adjustable based on the amount of the positional deviation of the sheet medium, and
• the take-up assembly mechanism is further configured to cause the take-up roller to be movable in sync with a movement of the position adjuster device.