| 摘要 |
1,247,170. Grinding. LANDIS TOOL CO. 3 Dec., 1968 [4 Dec., 1967], No. 57195/68. Heading B3D. A mechanism for the rotary location of a crank-shaft in a machine tool having a work drive spindle 12, Fig. 1, comprises an index plate 22 having a locating pin 25 for entering a locating hole O or recess in the crank-shaft to angularly position the crank-pins, and resilient means for applying a rotational force to the crank-shaft to maintain contact between the locating pin and a locating surface in the locating hole or recess. A clamping fixture 11 secures the crank-shaft to the work spindle 12 and includes an arm 13 operable by a piston-and-cylinder device 16, 17 to urge a member 18 to grip the crank-shaft against a block 21. The locating pin 25 is carried by the index plate and comprises two semi-cylindrical elements 27, 28, Fig. 4. The element 27 is rigid and at its end carries a ball 34 for engaging the locating hole O in the flange of the crank-shaft. The element 28 is resilient and at its end carries a ball 33 for engaging the locating hole, the resiliency of the member 28 acting through the ball 33 to ensure contact between the ball 34 and hole O to accurately position the crank-shaft. In another embodiment, the locating pin is in one piece formed with a transverse bore 41, Fig. 7, at one end receiving a screw-threaded member 46 for engaging the hole O in the flange and at the other end a spring-loaded ball 43 which engages the hole to press the member 46 into contact with the hole. The balls may be replaced by cylindrical elements. |
