Copying apparatus provided with a roll-up type sheet refeeding unit

A sheet refeeding apparatus which comprises a belt laid between a first and a second shafts, wherein as the belt is wound around the first shaft, copy sheets ejected from a copying machine are wound around the first shaft together with the belt, and as the belt is wound around the second shaft, the sheets wound around the first shaft are fed out thereof back to the copying machine. In collecting sheets, the first shaft is rotated in the same direction as that of the rotation of a photosensitive drum, and a sheet turn-over section is disposed upstream of the belt with respect to sheet conveying direction. Marks are provided for the belt to recognize the position of the belt. An initial position mark is given to the belt, and the mark functions as a standard for a return of the belt to the initial position on a supply of power for the apparatus or on the completion of a sheet refeeding operation. Further, when a sheet is detected being fed out of the belt during the return of the belt to the initial position, it is judged that a paper jam has occurred, and the returning operation is discontinued. The sheet refeeding apparatus comprises an ejection path through which sheets are ejected directly outside of the apparatus, an ejection path cover which is capable of opening and closed, and a switch for requesting coercive ejection of sheets. The switch is operative from the outside only when the cover is in an open state, and when the switch is operated, sheets are ejected onto the cover. Furthermore, the drive of the belt is controlled, when collecting sheets, to reduce the intervals among the sheets, when feeding the sheets out of the collecting section back to the copying machine, to gain the intervals among the sheets and when ejecting the sheets outside of the apparatus, to keep the intervals among the sheets as they were collected. The coercive ejection is allowed only when a sheet which is unnecessary for the sheet refeeding is included.