Sheet separator, sheet post-processing device, and image forming apparatus

A sheet separator, comprising:

• a first driving roller that rotates about a first rotation shaft and conveys a sheet bundle comprising a plurality of sheets;
• a pressing body that is capable of approaching the first driving roller;
• a sheet bending arm that is pivotable about the first rotation shaft located on a base end of the sheet bending arm;
• and
• a pressing arm that has a lock portion and is pivotable about a second rotation shaft located on a distal end of the sheet bending arm,
• wherein the first driving roller is rotatable in a first direction with the sheet bundle sandwiched between the first driving roller and the pressing body, and
• the pressing body pivots in the first direction about the first rotation shaft with the sheet bundle sandwiched between the first driving roller and the pressing body to cause the plurality of sheets to deviate from one another at edges.