Reference numeral 41 denotes a knife support shaft rotatably supported in the machine frame 2 and adapted to rock in response to the rotation of the drive shaft 1 and an arm member 46 is secured to {HEAD ~ the end portion} of {TAIL ~ the knife support shaft} extending out of the machine frame 2 
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Reference numeral 41 denotes a knife support shaft rotatably supported in the machine frame 2 and adapted to rock in response to the rotation of the drive shaft 1 and an arm member 46 is secured to { HEAD ~ the end portion } of { TAIL ~ the knife support shaft } extending out of the machine frame 2
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