| 摘要 |
945,837. Machine-tool details. UNITED SHOE MACHINERY CORPORATION. Dec. 10, 1959 [Dec. 10, 1958], No. 41976/59. Heading B3B. [Also in Division F2] Gearing between a rotary table 32 and its supporting structure 20 comprises a flexible strain gear 23 having internal teeth 24 which are adapted to be brought into engagement at circumferentially spaced regions on the peripheries of a fixed gear 22 on the supporting structure 20 and a gear 30 on the table 32. The strain gear 23 has the same circular pitch as the gear 22 and has the same number of teeth as the gear 30. The strain gear 23 is surrounded by a cam shaped wave generator 28 which acts on the gear 23 through bearing elements 26 having a flexible inner race 25 and a flexible outer race 27. The wave generator 28 can be rotated by utilizing capstan holes 28<SP>1</SP> in its periphery and has a 90 degrees lost motion connection with the inner race 25, which varies in thickness, so that in one direction of rotation the gear 23 becomes circular, Fig. 13a, to allow freedom of rotation of the table 32 with respect to the supporting structure 20, and in the other direction of rotation it makes the inner race 25 elliptical, Fig. 13c. The table 32 may be clamped in position by a lever 39 actuating an eccentric 38 controlling a spring pressed sleeve 34 having a conical clamping portion 34<SP>2</SP>. Reference has been directed by the Comptroller to Specification 790,171. |
