| 摘要 |
A plurality of feed units feed a copy sheet (13) down a sheet feed path (41) along which various operating units (18), (37) are disposed. The operating units (18), (37) function to transfer and fix a toner image to the copy sheet (13). Sensors (42), (43), (44), (46), (47) sense for the presence of the copy sheet (13) in the feed units at respective times. Absence of the copy sheet (13) indicates that the copy sheet (13) is jammed or stopped in the previous feed unit. In such a case, all feed units downstream of the feed unit in which the jam is sensed are driven to feed out prior copy sheets (13) in the downstream units. All feed units upstream of and including the feed unit in which the jam is sensed are de-energized to enable the operator to clear the jam.
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