| 摘要 |
A stapling machine with an increased momentum of the driver-ram combination for a heavy-duty task, the ram being accelerated by means of two electrical coils which surround externally the path of the ram to produce magnetic forces to speed up the movement of the ram. The rebound of the drive-ram combination is slowed down by means of an absorbing device which consists of many heavy-weight metal particles confined in a hollow round bar forming the ram, which particles move along but lag behind the movement of the ram so that the ram, when it rebounds will move against the particles still moving forward thereby dissipating ram momentum to prevent bouncing-back movement of the ram.
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