Sheet finisher

A finisher for binding a sheet bundle, comprising:

• a conveying portion configured to convey a sheet;
• a tray configured to stack the sheet conveyed by the conveying portion one by one for forming the sheet bundle;
• an insertion portion to which the sheet bundle is configured to be inserted by an operator, the insertion portion being arranged on a front side of the finisher relative to the tray in a front-rear direction of the finisher;
• a stapler, configured to bind the sheet bundle by a staple, having
• a head at a front portion of the stapler for binding the sheet bundle, and
• a cartridge at a rear portion of the stapler for containing the staple;
• a stapler moving mechanism configured to move the stapler to a first stapling position for binding a corner portion of the sheet bundle at a rear side in the front-rear direction formed on the tray, a second stapling position for binding the sheet bundle inserted into the insertion portion located at the front side relative to the first stapling position in the front-rear direction, and a staple loading position for removing the cartridge and replenishing a new cartridge at a front position relative to the first stapling position in the front-rear direction;
• and
• a stapler turning mechanism configured to turn the stapler to a posture such that the rear portion rather than the front portion of the stapler is located at the front side in the front-rear direction in order that the cartridge can be easily removed in a direction from the front portion to the rear portion when replacing the cartridge.