Sheet processing apparatus and image forming system

A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:

• a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
• a transport section adapted to be able to transport the sheet in a first direction for drawing the sheet transported to the transport path, and in a second direction for switching back the drawn sheet in a direction opposite to the direction for drawing;
• a rotating body pair adapted to nip the sheet transported to the transport path by a nip portion to rotate, and thereby perform folding processing on the sheet;
• a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
• a press member adapted to press the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
• and
• a support portion adapted to support the press member,
• wherein the support portion is disposed on a side opposite to the rotating body pair with the transport path therebetween and on an other direction side opposite to the one direction side in the transport direction with a nip line for connecting between the nip portion and a front end portion of the folding blade therebetween.

A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:

• a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
• a rotating body pair adapted to be able to transport the sheet in a first direction for nipping the sheet transported to the transport path by a nip portion to rotate, and thereby drawing the sheet to perform folding processing, and in a second direction for switching back the sheet subjected to the folding processing in a direction opposite to the direction for drawing;
• a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
• a direction change member adapted to change a direction of the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
• and
• a support portion adapted to support the direction change member,
• wherein the support portion is disposed on a side opposite to the rotating body pair with the transport path therebetween and on an other direction side opposite to the one direction side in the transport direction with a nip line for connecting between the nip portion and a front end portion of the folding blade therebetween.

A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:

• a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
• a transport section adapted to be able to transport the sheet in a first direction for drawing the sheet transported to the transport path, and in a second direction for switching back the drawn sheet in a direction opposite to the direction for drawing;
• a rotating body pair adapted to nip the sheet transported to the transport path by a nip portion to rotate, and thereby perform folding processing on the sheet;
• a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
• a direction change member adapted to change a direction of the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
• and
• a support portion adapted to support the direction change member,
• wherein the support portion is disposed on a side opposite to the rotating body pair with the transport path therebetween and on an other direction side opposite to the one direction side in the transport direction with a nip line for connecting between the nip portion and a front end portion of the folding blade therebetween.