| 摘要 |
Disclosed is a sheet feeder device including means for supporting a generally vertical stack of sheets. The supporting means include endless belts having an upper belt run position to extend across the bottom of the stack of sheets. A stationary gate forming member is provided which is positioned above the upper run of the belts and adjacent the forward side of the stack to define a nip which forms a gap between the gate forming member and the upper run for permitting the lowermost sheet of the stack to pass forwardly from the stack through the nip. The gate forming member is a cylindrical roll defining a central axis and an outer peripheral surface which is concentric to the central axis. The roll has a groove extending axially along the length thereof. An elastomeric bar is disposed in the groove, and the bar has a coefficient of friction which is higher than that of the material of the roll. Also, the bar is sized so as to extend radially beyond the peripheral surface. This portion of the bar includes a rearwardly facing edge surface which extends generally along a tangent to the outer peripheral surface of the roll. In operation, the lowermost sheet is fed by the endless belts through the nip without engaging the bar and without significant frictional resistance, while the sheet immediately above the lowermost sheet engages the bar and is retarded in its advance by its engagement with the material of the bar.
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