Sheet aligning and shifting device

A sheet storage apparatus comprising:

• a sheet discharge path having a sheet discharge outlet;
• a stack tray disposed on a downstream side of the sheet discharge outlet;
• a support device disposed between the sheet discharge outlet and the stack tray to load at least a part of a sheet;
• a sheet end regulation device for regulating a position of at least one end edge of the sheet supported by the support device;
• and
• an aligning transport device disposed in the support device to carry the sheet toward the sheet end regulation device,
• wherein the aligning transport device is comprised of a friction transport body that engages in a top surface of the sheet supported by the support device, and
• a transport body travel device for shifting the friction transport body along a sheet surface by a predetermined amount in a travel direction crossing a sheet discharge direction at a predetermined angle, and
• the friction transport body has a rotating member rolling along the top surface of the sheet supported by the support device, and the rotating member rotates in a direction crossing the travel direction.