| 摘要 |
<p>An indexing apparatus for a rotary table (1) has a support shaft (2) rotatably supported by a base member (3) in which indexed terminal positions of the rotary table is determined by abutment of a stopper member (5) provided on the rotary table against positioning members (6a, 6b) provided on the base member. The indexing apparatus comprises a rack-pinion mechanism (9) comprising a rack (8, 8A) and a pinion (7) fixed around the support shaft (2) of the rotary table for rotating the same, a feed screw shaft (14, 14A) rotatably supported by the base member and extending along the rack (8, 8A) in a direction of the movement thereof, a brakable electric motor (15) for driving the feed screw shaft, and a feed nut (21, 21A) engaging the feed screw shaft. The rack and the feed nut are arranged so that either one of them has integral portions disposed at both sides of the other with spaces left on both the sides in the direction of the movement of the rack. Annular springs (28a, 28b; 28aA, 28bA) are disposed in each space. As the rotary indexing operation approaches the terminal position, the spring is elastically deformed in the direction of the movement of the rack so that shocks due to the abutting are prevented.</p> |
