PURPOSE: To prevent the arising of flaws, causing quality lowering or breakage, etc., by elevating a drum chock pivotally mounted on one end part of an interlocking arm to which the rotating motion of first and second drive shafts is combinedly transmitted.
CONSTITUTION: When a band plate is shorn, a motor 13 is driven to concurrently rotate a drum rotating shaft 11, a second drive shaft rotating shaft 24 and a first drive shaft rotating shaft. A first drive shaft 16 is rotated by the rotation force of the first drive shaft rotating shaft via a shaft 18 and a gear 17 to cause the eccentric motion of a second drive shaft 20. The second drive shaft 20 is rotated by the rotation force of the second drive shaft rotating shaft 24. Consequently the eccentric motion and rotating motion of the second drive shaft 20 is combined to become the elevating motion of a drum chock 2, via an interlocking arm 22, to elevate upper and lower drums 3 and 4. Consequently the elevation of the drum chock 2 synchronizes with the rotation period of the upper and lower drums 3 and 4, upper and lower shearing edges 5 and 6 make contact with the band plate only at the time of shearing.
UNOKI KENICHI
HASHIMOTO RITSUO
