Apparatus for processing sheets and apparatus for forming images provided with the apparatus

A sheet processing apparatus comprising:

• a placement tray adapted to place transported sheets;
• and
• a press bind unit adapted to press a bunch of sheets placed on the placement tray to bind,
• wherein the press bind unit is provided with a receiving portion including an opening to receive a part of a bunch of placed sheets, pressing teeth that press from the frontside and backside of a bunch of sheets received in the receiving portion in a bind position to crimp the sheets, and
• a sheet guide provided in the receiving portion to guide a sheet to carry in to the bind position, and
• the apparatus is provided with a shift hold member that holds the sheet guide to shift between a guide position for narrowing the opening to carry the sheet in the bind position and an expanded position with an opening wider than the opening, in conjunction with a shift in a pressing direction of the pressing teeth.

A sheet processing apparatus comprising:

• a placement tray adapted to place transported sheets as a bunch;
• and
• a bind unit adapted to shift along an end edge of a bunch of sheets placed on the placement tray,
• wherein the bind unit is provided with a receiving portion including an opening to receive a part of a bunch of placed sheets, a bind portion that binds the bunch of sheets received in the receiving portion in a bind position, and
• a sheet guide provided in the receiving portion to guide a bunch of sheets to carry in to the bind position, and the sheet guide is able to be positioned in a guide position for narrowing the opening to carry in a sheet and in an expanded position with an opening wider than the opening, and when the bind unit shifts along the end edge of a bunch of sheets, is positioned in the expanded position.

A sheet processing apparatus comprising:

• a placement tray adapted to place sheets to undergo binding processing as a bunch;
• and
• a press bind unit adapted to be able to shift along an end edge of a bunch of sheets on the placement tray, wherein the press bind unit is provided with a receiving tooth, and a pressing tooth which meshes with the receiving tooth to perform press binding on the bunch of sheets nipped therebetween, and
• the pressing tooth includes a press position for meshing with the receiving tooth, and a sheet receiving position spaced a predetermined distance away from the receiving tooth to receive the sheets in between the receiving tooth and the pressing tooth, and in the case of displacing the press position and performing multiple press binding after pressing the bunch of sheets, is shifted to an intermediate position between the press position and the sheet receiving position.