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 {HEAD ~ an arm member} 46 is secured to {TAIL ~ the end portion} of the knife support shaft extending out of the machine frame 2 
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 { HEAD ~ an arm member } 46 is secured to { TAIL ~ the end portion } of the knife support shaft extending out of the machine frame 2
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