| 摘要 |
1349004 Cutting tool feed devices R SCHMIDT and E SCHMIDT 4 May 1971 [6 May 1970] 13082/71 Heading B3T Tool feed apparatus in a lathe comprises a tool guide and slide 1, 2 attached to the compound slide 9, 23 of the lathe, connecting means 3 formed by a stop rod 4 secured to the lathe frame 10 and connected to the tool slide 2 by way of a lever linkage and which is adapted to cause retraction and feed traverse of the cutting tool 2a with the slide 2 as a result of the traverse of the compound slide 9, 23, the top slide being set obliquely to the lathe spindle axis. In operation the lathe cross slide 23 is set to the required in feed position and the cutting traverse commenced the tool and slide 2a, 2 moving in the normal traversing motion and stop rod 3 sliding in its support 11 on the lathe frame 10 until a stop 5 or the rod 4 abuts a sleeve 12 through which the rod is sliding. The stopping of the rod 4 causes pivoting of lever link 19 which in turn pivots a further lever 6 against a spring 17 which releases a latch pawl 16 from a recess in the guide 1 to permit the tool slide 2 to move relative to the guide 1 and whereby continued movement of the compound slide 9, 23 due to the oblique orientation of the slides retracts the tool slide and tool from the workpiece. The direction of traverse of the compound slide is then reversed and the assembly 1, 2, is moved with the rod until the stop 7 or the rod 4 engages the spring 25 whereupon the latch pawl is re-engaged in its recess. The infeed is then reset and a further cutting traverse can be commenced. In the embodiments described the machining operation performed is that of screw cutting. Internal and external thread can be cut by changing the orientation of the slide 9 with respect to the spindle axis. |
