| 摘要 |
PURPOSE:To facilitate centering alignment work by meshing the driving gear with a screwed driven gear fitted on the rotary shaft with capability of axially moving together with the shaft through the shaft supporting part, and by putting said screwed part in engagement with a fixed housing. CONSTITUTION:A ring-shaped driven gear 12 having at a portion of its periphery a screwed part 12a is fitted on a rotary shaft 2 through a bearing 11 capable of receiving the force both in the radial and thrust directions. This gear 12 is borne by a fixed housing 14 in screw engagement with said screwed part 12a and coupled with a driving gear 16 mounted at the shaft end for a location adjustment drive motor 17 through an intermediate gear 15 fitted in said housing 14. When this location adjustment drive motor 17 is actuated, the abovementioned ring-shaped driven gear 12 is rotated through the driving gear 16 and intermediate gear 15, and the screw action given with the fixed housing 14 moves the ring-shaped gear 12, bearing 11 and rotary shaft 2 in the axial direction. |
