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

A sheet processing apparatus comprising:

• a first guide plate having a plurality of first openings;
• a second guide plate facing the first guide plate with a given space in a thickness direction of a sheet, the second guide plate having a plurality of second openings and a third opening;
• a sheet conveyance passage between the first guide plate and the second guide plate;
• and
• a sheet conveyor to convey the sheet along the sheet conveyance passage in a sheet conveyance direction, the sheet conveyor including:
• a plurality of drive rollers protruding from the first guide plate toward the sheet conveyance passage through the plurality of first openings;
• a plurality of first driven rollers facing the plurality of drive rollers and protruding from the second guide plate toward the sheet conveyance passage through the plurality of second openings;
• and
• a second driven roller protruding from the second guide plate toward the sheet conveyance passage through the third opening at such a position that the second driven roller does not face the plurality of drive rollers, and
• the second driven roller disposed at a position shifted from the drive roller in a width direction orthogonal to the sheet conveyance direction and the thickness direction,
• wherein the plurality of first driven rollers and the second driven roller are rotatably and commonly supported by a support shaft, said support shaft extending in a width direction.