Patent ID: 7892161

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 in parallel with the first axis and biased to the first folding roller separably to a separating direction to make a nip together with the first folding roller therebetween; a blade unit configured to push the plurality of sheets stacked by the stacker into the nip; a panel formed a concave portion recessed from a side facing to the plurality of sheets supported by the stacker at a position; a movable roller cover formed to bend at a side nearest the concave portion so as not to interfere with the panel, configured to move together with the second axis without rotation in the separating direction to prevent the second folding roller from contacting the plurality of sheets stacked by the stacker when the blade unit starts contacting the plurality of sheets stacked by the stacker; and a stapler head configured to staple at the position the plurality of sheets supported by the stacker at a side of the second folding roller.