Patent ID: 7017902

Claim:
A sheet processing apparatus comprising: a feeding portion to take out plural sheets on a main transport path one by one; a detection portion to detect characteristics of the sheets taken out on the main transport path by the feeding portion; a first unit including the feeding portion and the detection portion; a second unit connected to the first unit through the main transport path; a gate to selectively branch the main transport path at the downstream side in the conveying direction front the detection portion; a third unit branched from the main transport path by the gate and connected to the first unit through a diverging path lead from the first unit; a first conveying mechanism to convey the sheets taken out on the main transport path by the feeding portion in the first unit through the main transport path; a second conveying mechanism to receive sheets conveyed from the first unit by the first conveying mechanism and conveys the sheets in the second unit through the main transport path; a third conveying mechanism to receive sheets diverged from the main transport path through the gate and convey the sheets in the third unit through the diverging path; classifying/stacking portions to classify and stack the sheets conveyed to the second unit through the main transport path based on detection results by the detection portion; a banding unit to stack the sheets conveyed to the third unit through the diverging path and bands the sheets for every specified number of sheets based on the detection result by the detection portion; a first detecting portion to detect the conveying state of the sheets conveyed by the first conveying mechanism; a second detecting portion to detect the conveying state of the sheets conveyed by the second conveying mechanism; a third detecting portion to detect the conveying state of the sheets conveyed by the third conveying mechanism; and a controller to control the first conveying mechanism to stop thereof when the jamming of sheet is detected by the first detecting portion, control the second unit to classify and stack sheets conveyed to the second unit in classifying/stacking portions, and control the third unit to stack the sheets conveyed to the third unit into the banding unit.