| 摘要 |
The present invention relates to a double acting type dynamic back spacing removed driving system which comprises a non-reversible transmission worm gear and worm set including two sets of worms coupling with a worm gear. When the system is driven, one prime worm continues applying rotary driving force, and whether or not the worm gear is driven, such force continues to engage the prime work permanently. A second prime worm is to control displacement and also couples with another worm gear (or is co-axially secured to the respective worm gear with the same or different pitch). Due to the different driven speeds of the two sets of worms when rotating in opposite directions, a tensive state is produced between the threads of the two sets of worms and the worm wheel and back-lash is eliminated. On rotation in one direction, one set of worms is driven faster and the other set is driven more slowly. When the direction is reversed, the respective speeds of the sets of worms are also reversed. The speed difference in either direction of rotation is taken up by one set of torsion limiting transmission devices so that back lash is eliminated. <IMAGE> |
