Patent ID: 7866644

Claim:
A sheet folding apparatus, comprising: a stacker configured to stack a plurality of sheets; a first folding roller configured to rotate around a first axis; a second folding roller configured to rotate around a second axis which is parallel with the first axis and biased to the first folding roller separably to make a nip together with the first folding roller therebetween; a blade unit configured to push a surface of the plurality of sheets, stacked by the stacker, into the nip; a stationary support configured to support the blade unit linearly movable to avoid deviating from a common tangential direction of the first folding roller and the second folding roller at the nip to a first folding roller side, the stationary support comprising a pair of skids with aligning axes of the pair of skids in a direction parallel with the common tangential direction; and a movable support relatively movable against the blade unit, configured to bias the blade unit to the first folding roller side deviatably from the common tangential direction to a second folding roller side.