Sheet processing apparatus and image forming apparatus having the same

A sheet processing apparatus includes a conveying portion， a stack portion on which sheets are stacked， a first binding portion moving in a crossing direction crossing a conveying direction， a first regulating portion regulating a position of a sheet bundle stacked on the stack portion in the crossing direction， a first rack moving in the crossing direction with the first regulating portion， a first pinion forming a rack-pinion mechanism with the first rack， a second regulating portion regulating a position of a sheet bundle stacked on the stack portion in the crossing direction， a second rack moving in the crossing direction with the second regulating portion， a second pinion forming another rack-pinion mechanism with the second rack， a third regulating portion regulating a position of a sheet bundle stacked on the stack portion， and a second binding portion which binds a corner portion of a sheet bundle without a staple.

一种纸张处理设备，包括输送部、用于堆叠纸张的堆叠部、沿与输送方向交叉的横向移动的第一装订部、对堆叠于该堆叠部的纸张堆在该横向的位置进行调节的第一调节部、与该第一调节部一同沿横向移动的第一齿条、与该第一齿条构成齿轮齿条机构的第一小齿轮、对堆叠于该堆叠部的纸张堆在该横向的位置进行调节的第二调节部、与该第二调节部一同沿横向移动的第二齿条、与该第二齿条构成另一齿轮齿条机构的第二小齿轮、对堆叠于该堆叠部的纸张堆进行位置调节的第三调节部，以及无需使用订书钉即可装订纸张堆边角部位的第二装订部。