Sheet post-processing apparatus with function of punching sheet

摘要

A sheet post-processing apparatus which is capable of shortening time wasted until actual start of punching and enhancing productivity. A drive unit causes a moving member which has a cam and reciprocates. A punching member is driven by a movement of the cam of the moving member and punches a sheet when the moving member moves forth and moves back. A determination unit determines a type of the sheet. A control unit controls, when a sheet to be punched is to be subjected to a punching process, the drive unit such that the moving member starts moving before conveyance of the sheet to be punched stops, and controls, when the sheet to be punched is to be subjected to the punching process, the drive unit such that timing with which the moving member starts moving is changed based on the determination by the determination unit.

主权项

1. A sheet post-processing apparatus comprising:
a moving member configured to have a cam and reciprocate; a drive unit configured to cause said moving member to reciprocate; a punching member configured to be driven by a movement of the cam of said moving member and punch a sheet when said moving member moves forth and moves back; a determination unit configured to determine a type of the sheet; and a control unit configured to, when a sheet to be punched is to be subjected to a punching process, control said drive unit such that said moving member starts moving before conveyance of the sheet to be punched stops, and when the sheet to be punched is to be subjected to the punching process, control said drive unit such that timing with which said moving member starts moving is changed based on the determination by said determination unit, wherein a type of an immediately preceding sheet punched prior to the sheet to be punched is a first type, said control unit controls said drive unit such that said moving member starts moving with earlier timing compared to a case where the type of the immediately preceding sheet is a second type that puts a heavier load on said drive unit than the first type.