Patent ID: 8083218

Claim:
A sheet folding apparatus comprising: a fold unit configured to fold a center of a sheet bundle to form a fold line, wherein the sheet bundle on which the fold line is formed includes a cover sheet and an inner sheet sandwiched between the cover sheet; a reinforce roller configured to reciprocate along a direction of the fold line while nipping and pressing the fold line and reinforce the fold line of the sheet bundle; and a control section configured to: set the number of times of reciprocating movement of the reinforce roller to a first number of times when each of the cover sheet and the inner sheet is a standard paper with a specified thickness or less, and set the number of times of reciprocating movement of the reinforce roller to a second number of times larger than the first number of times when the cover sheet is a thick paper thicker than the standard paper and the inner sheet is the standard paper.