| 摘要 |
PURPOSE:To prevent the deviation of meshing position between a rack and a gear by forming each of a linear slot and a linear projection having a complementary shape so as to be fitted to a carrier provided with the rack and the gear meshing with the rack while being extended into the carrier moving direction. CONSTITUTION:Each of the linear slot 33a and the linear projection 5f having the complementary shape so as to be mated with the carrier 5 provided with the rack 5d and the double gear 33 meshing with the rack 5d is formed while being extended in the moving direction of the carrier 5. Thus, the gear 33 and the rack 5d have no mutual meshing deviation and the carrier 5 is always stopped at the normal stop position.
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