SHEET FOLDING DEVICE, SHEET PROCESSING DEVICE, SHEET CARRYING DEVICE, IMAGE FORMING DEVICE AND SHEET FOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce operation force during additional-folding operation and suppress troubles in a drive system. SOLUTION: An additional-folding part 525 for folding a carried sheet bundle S and then additionally folding the sheet bundle S is provided with a guide rod 526 installed in the direction orthogonal to the sheet carrying direction; a slider 522 moved along the guide rod 526; an additional-folding roller 520 rolled on a fold and pressurizing it; lower and upper housings 530, 532 for supporting the additional-folding roller 520 vertically with respect to a face parallel with the moving direction of the slider 522 and rotatably in parallel with the parallel face at an inclination angleθ1 so that the pressurizing point when the fold is pressurized is positioned on the moving direction upstream side from the normal extended from a mounting portion to the slider 522 to the face of the sheet bundle S; and a compression spring 521 for elastically energizing the additional-folding roller 520 to the sheet shaped recording medium direction. COPYRIGHT: (C)2009,JPO&INPIT