| 摘要 |
PURPOSE:To replace a belt in a fixed state without moving the position of the shaft center by providing a wedge member between rotary shaft or a support table and a pulley disc in such a manner that the pulley disc is capable of sliding on the support table. CONSTITUTION:In case of replacing a belt, a bolt 16b among a plurality of bolts 16 is detached and a bolt 16a is loosened. When a wedge member 4 is released by a bolt 16 in such a condition, as pressing force produced by belt tension is applied to a pulley disc 15, the pulley disc slides along an elongated hole 15e on a support table 13. When the wedge member 14 is detached, a clearance which is substantially half the length of the elongated hole 15 is formed between the pulley disc and the belt. Accordingly, the belt can be easily replaced by using the clearance. When the wedge member 4 is again fastened to a rotary shaft 11 by the bolt 17 after the completion of replacing the belt, as the pulley disc 15 is returned to the coaxial position with the rotary shaft 11, the bolts 16a, 16b are tightened. Thus the belt can be replaced easily without moving the position of the shaft center. |
