| 摘要 |
A high speed sheet feeder machine includes at least one pusher that follows a loop-shaped path of travel as the machine operates. The pusher pushes an insert into an envelope during a forward and downward part of its path of travel and then retreats rearwardly and upwardly along the loop-shaped path of travel before repeating an insertion. In this way, the pusher makes no abrupt changes in its path of travel. Very high rates of insertion are made possible by providing multiple pushers at longitudinally spaced apart intervals along the loop-shaped path of travel. A stop plate is integrally formed with each pusher assembly and a fixed position barrier is mounted on the machine adjacent the rearward end of the loop-shaped path of travel to prevent over-rotation of each pusher member at very high speeds.
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