| 摘要 |
PURPOSE:To prevent an endless transmission belt from coming off a pulley by forming an annular groove on a first pulley and inserting a second pulley in this annular groove. CONSTITUTION:An annular groove 11, which is opened around the whole circumference, is formed on a first pulley 3, and a second pulley 4 is inserted in this annular groove 11. Thereby, the distance between the shafts of the mutually adjoining two pulleys 3, 4 can be set less than half the sum of the outside diameters of the two pulleys 3, 4. Furthermore, it does not occur that the endless transmission belt 10 is engaged with any of the pulleys 3, 4, being deviated in the direction of its shaft, i.e., in the axial line of the pulleys 3, 4 and, thereby, the endless transmission belt 10 can be prevented from coming off the pulleys 3, 4 while moving. |
