wherein said means for moving said knives comprises two guide pins mounted in spaced relationship in said U shaped holder, individual guide parts having on both ends spherical bushings which run on said guide pins and a guide cylinder for moving each of said guide parts back and forth along said guide pins, and wherein each of said knife holders includes {HEAD ~ two cotter pins} by {TAIL ~ means} of which said knife holders can be inserted into holes which are in said individual guide parts 
wherein said means for moving said knives comprises two guide pins mounted in spaced relationship in said U shaped holder , individual guide parts having on both ends spherical bushings which run on said guide pins and a guide cylinder for moving each of said guide parts back and forth along said guide pins , and wherein each of said knife holders includes { HEAD ~ two cotter pins } by { TAIL ~ means } of which said knife holders can be inserted into holes which are in said individual guide parts
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