| 摘要 |
A vacuum roller assembly adapted to singulate a sheet from a stack of sheets. The vacuum roller assembly comprising a stationary inner plenum having a substantially linear plenum slot disposed in fluid communication with the vacuum source and a rotating vacuum roller disposed over the stationary inner plenum and rotating about a rotational axis. The vacuum roller includes a plurality of apertures disposed in fluid communication with the substantially linear plenum slot and about the periphery in at least one region of the roller. Furthermore, each of the apertures is substantially slot-shaped and defines a major axis. The major axis is off-axis with respect to the substantially liner plenum slot of the inner plenum to reduce audible noise levels produced by the rotating vacuum roller as air flows through each rotating aperture into the stationary linear plenum slot.
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