| 摘要 |
A high speed sheet feeder comprises a support for supporting a stack of sheets. The sheets are driven by a backing plate assembly along the support toward a singulator. The backing plate is driven by a drive member such as a drive chain positioned along the support. The drive chain moves the backing plate in predetermined increments. The singulator is mounted on a bracket that moves in response to pressure exerted by the leading face of the stack thereupon. The increments in which the backing plate moves are varied based upon the degree of movement of the singulator bracket in response to pressure exerted thereupon by the stack. Minimum pressure causes a maximum increment of movement while maximum pressure causes a minimum increment or virtually no movement in the backing plate assembly. The singulator comprises an elastomeric wheel pivotally mounted on a support bracket having concentric a sleeve that is mechanically interconnected with the drive mechanism. The singulator assembly further comprises a pair of belts, located below the singulator wheel that moving conjunction with the singulator wheel. The belts are located adjacent opposite sides of the singulator and are received by grooves in a feed ramp at the end of the support.
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