| 摘要 |
1279002 Gear-cutting HOBOURN-EATON MFG CO Ltd 22 June 1970 [23 June 1969] 31682/69 Heading B3K In a machine for cutting a rack on a workpiece 11, the latter is held on a table 16 by clamps 13, the table is slidably mounted on an intermediate member 15, and the latter is fixed to a carriage 10, which is slidable on a bed 8. A follower 22 engages a cam path 24 fixed to bed 8, and the follower is carried by a bell-crank lever 18, pivoted at 19 to a bracket 17, fixed to carriage 10. In operation, carriage 10 is moved past a reciprocating rotary cutter, and roller and cam 22, 24, cause a movement of table 16 relative to the carriage along the axis of workpiece 11, so that the pitch of the rack teeth cut on the workpiece varies along its length, and since the cutter is driven in timed relationship to the movements of carriage 10, and rotates in mesh with the rack teeth which it cuts, the teeth are of the required correct shape. The pitch can be arranged to vary in any way by providing a cam of suitable design. |
