| 摘要 |
A sheet feeding apparatus has a stocker unit for storing a stack of sheet materials, a forward sheet feed roller having an operative condition capable of feeding a sheet material in a forward direction from the stocker unit during each cycle of operation of the apparatus, a sheet passageway through which a sheet material is to be fed in the forward direction further away from the stocker unit, a detector assembly for detecting the presence of a single sheet material or the concurrent presence of two or more sheet materials in the sheet passageway, a backward/forward feed roller located in proximity to the forward sheet feed roller and operative to feed a sheet material in a backward direction toward the stocker unit, a control system for actuating the backward/forward feed roller to feed a sheet material in the backward direction toward the stocker unit if the concurrent presence of two or more sheet materials in the sheet passageway is detected by the detector assembly when the forward sheet feed roller is in the operative condition, or the presence of at least one sheet material in the sheet passageway is detected by the detector assembly when the forward sheet feed roller is not in the operative condition.
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