| 摘要 |
895,062. Automatic lathes. HAHN, E., [trading as INDEX-WERKE KOMM.-GES. HAHN & LESSKY]. May 8, 1959, No. 15962/59. Class 83 (3). An automatic single spindle lathe is provided with means for turning a workpiece end-for-end which supports the workpiece during cutting-off and then turns it to present the previously machined end for gripping in the chuck, the means being operable at each second working cycle of the lathe. A constantly rotating shaft 26, Fig. 1, is adapted to drive a coupling device 30, 30a whereby the shaft 31 and the shaft 31a may be given a rotation in timed relation to other operations of the machine. The shaft 31 supports a chuck-operating cam 32 keyed thereto and a " reciprocating-gripper " feed-cam 33 which is free on the shaft 31 but may be clutched to the cam 32 for rotation. The outer end of shaft 31, Fig. 2, carries a pinion 42 which drives a larger pinion 43 in a 2: 1 ratio. The latter pinion has a cam-ring 67 integral therewith which operates a spring-pressed fork 50 controlling the position of a spring-pressed clutch-sleeve arrangement 56, 60, 62. The cam-ring 67 is shaped to disengage the barstock feed cam from its driving cam 32 at each revolution of wheel 43, that is at each second operation of the chuck cam. Operation. While the bar-stock feed is " missing " an operation, as above, clutch 30a operates to set in motion, for a revolution, the cam 34 secured to shaft 31a. This moves a rod 39 connected to a slide 75, Fig. 7, which is movable parallel to the workpiece and is carried by the transverse slide 23 of the machine. The slide 75 supports a rotatable spindle 77 with three spring-controlled gripping arms 83-85 at one end. These are forced in by movement of slide 23 to embrace a workpiece 20 just prior to parting-off and when this has taken place the slide 75 is moved axially in a rearward direction by the rod 39. A slidable rack 90 also housed in the slide 75 engages a pinion 87 connected through a ratchet device with the spindle 77 so that when the end of the rack strikes a stop 100, Fig. 8, mounted on the transverse slide 23, the movement of the rack is halted and pinion 87 is rotated to turn spindle 77 and thus turn the workpiece end-for-end. The workpieee is finally forced back into the lathe chuck by a pin mounted in one of the turret stations. |
