Patent ID: 8313098

Claim:
A paper transport device used in a paper processing apparatus for an image forming apparatus, the paper transport device comprising: a plurality of transport rollers to transport at least one paper at a time, the transport rollers includes an ejecting roller which is disposed at a most downstream of all transport rollers and which is configured to run independently of all other transport rollers in one paper transport device; a paper-jamming detecting unit to detect a paper-jamming of a paper that is being transported by the transport rollers; a position detecting unit to detect positions of papers that are being transported by the transport rollers; and a control unit to control driving of the transport rollers, wherein when the paper-jamming detecting unit detects the paper-jamming and the position detecting unit detects that a part of a paper is not exposed on an outside of the paper processing apparatus, the control unit stops the transport rollers to prevent ejection of all the papers from the paper processing device, and when the paper-jamming detecting unit detects paper-jamming and the position detecting unit detects that a part of a paper is exposed on an outside of the paper processing apparatus and another part of the same paper passes through the transport roller immediately before the ejecting roller, the control unit drives the ejecting roller to complete ejection of only the paper the part of which is exposed on the outside of the paper processing apparatus.