SHEET FOLDING APPARATUS, IMAGE FORMING APPARATUS USING THE SAME, AND SHEET FOLDING METHOD

摘要

A sheet folding apparatus includes a fold unit to fold a center of a sheet bundle to form a fold line, a reinforce roller which reciprocates along a direction of the fold line while nipping and pressing the fold line and reinforces the fold line of the sheet bundle, and a control section to changeably set the number of times of reciprocating movement of the reinforce roller according to a thickness of a sheet contained in the sheet bundle.