Sheet processing device and image forming device provided with the sheet processing device

Abstract

To provide a sheet processing device that performs saddle stitching processing that binds a bundle of stacked paper sheets at a position around a center thereof and then folds in half the paper sheet bundle at the binding portion, the device being capable of selectively performing both saddle stitching using a metallic staple and saddle stitching not using the metallic staple for environmental protection and capable of reducing a size. A sheet processing device includes a stacker section that temporarily stacks conveyed paper sheets in a substantially vertical attitude, a stopper that regulates the paper sheets stacked in the stacker section, a first binding section that is provided in the stacker and saddle-stitches, with a metallic staple, a paper sheet bundle at a binding position around a center of the paper sheet bundle in a sheet conveying direction, a second binding section that saddle-stitches, without using the metallic staple, the paper sheet bundle at the binding position around the center of the paper sheet bundle in the sheet conveying direction, and a folding section that folds in half the paper sheet bundle. An interval between the second binding section and folding section is set smaller than an interval between the first binding section and folding section.