SHEET-LIKE MEDIUM POST PROCESSING DEVICE, IMAGE FORMING DEVICE AND METHOD FOR POST PROCESSING FOR SHEET-LIKE MEDIUM

摘要

PROBLEM TO BE SOLVED: To realize the compactification and the reduction of the cost of a constitution in a sheet-like medium post processing device and also to excellently perform the stapling work of all parts without being affected by rise or curls caused by staples. SOLUTION: This image forming device 1 has an image forming part 2 and the sheet-like medium post processing device 4 provided by a top mount system to the image forming part 2. The sheet-like medium post processing device 4 has an arraying means 99 and a stapler 9 on the downstream side of the pair of paper ejecting rollers 3, so that the array of paper by the arraying means 99 and the stapling of arrayed paper are performed on an ejected paper tray 12. An auxiliary tray 55 selectively set at a horizontal position and a perpendicular position is provided on the upper side of the ejected paper tray 12, and paper rear end parts are stacked, are arrayed and are stapled at the auxiliary tray 55 in the state of being isolated from paper on the ejected paper tray 12 in a staple mode.