A gripper assembly is provided which rides on guide shafts adjacent said channel with the movement of the gripper in the channel constantly being monitored by an encoder connected thereto and positive drive is supplied to {HEAD ~ the gripper} towards {TAIL ~ the blade} by a clutch means in conjunction with a rack and pinion arrangement 
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A gripper assembly is provided which rides on guide shafts adjacent said channel with the movement of the gripper in the channel constantly being monitored by an encoder connected thereto and positive drive is supplied to { HEAD ~ the gripper } towards { TAIL ~ the blade } by a clutch means in conjunction with a rack and pinion arrangement
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