| 摘要 |
975,261. Indexing work-tables. E. A. THOMPSON. March 8, 1961, No. 8549/61. Heading B3B. A table, mounted on a base for intermittent movement, has sockets on the table for holding workpieces into which a locating pin on the base is arranged to extend by means operative during intermissions in table movement. The indexible table 10, Fig. 2, carries work-holders 114 which are brought under tool stations 14. The table is clamped during working operations on a flat support surface 20 and a tapered surface 18 provided on the support 16 secured to a base 13. The table 10 is secured to a rotatable centre shaft 28 supported by the member 16 and base 13 and urged downwardly to clamp the table by a spring disc at the lower end. An internal gear ring 108 is provided on the table, which is engaged by a plunger 92, Fig. 1, prior to indexing. The latter is moved outwardly against a spring 96 by fluid pressure in a cylinder 98. The plunger is carried in an arm 70 pivoted on the centre shaft 28 and having gear segments 74 which engage a pair of racks 78 operated by fluid pistons 80. The arm 70 is oscillated between stops 88 to effect the indexing of the table. The latter is accurately located in the working positions by fluid operated plungers 120, Fig. 2, which move upwardly to engage recesses in the underfaces of work-holders 114 bolted to the table. A combined electrical and fluid-pressure layout for giving an automatic co-ordinated cycle to the table and tool-stations is described, Fig. 5 (not shown). |
