Patent GB-458011-A (GB)
Title: Improvements in and relating to automatic turret lathes
IPC: B23B7/12
Filed: 1936-05-08
Abstract: 458,011. Lathes. POPPENSIEKER, F., 39, Ubierring, Cologne, Germany. May 8, 1936, No. 13099. [Class 83 (iii)] In an automatic turret lathe the movement of the longitudinal turret slide 7 is derived from the usual cam drum 10 while the idle movement is effected at higher speed by means of hydraulic gearing. The machine has a box frame consisting of side members 2, 3 and a top beam 5 from which the turret slide is suspended. A second slide 6 is mounted on a bracket 4. The drum 10 which operates the slide 7 through the rod 11 is mounted in the standard 3 and carries a series of six cams 12, 13, Fig. 3, for consecutive working movements of the turret slide. These cams are separated by spaces wherein the cam roller 18 on the member 11 may be operated by a hydraulic ram 23 for the high speed approach or withdrawal movement. A motor 32, Fig. 5, is connected through gears 33, bevel gearing 35, change gears 36, shaft 37, overrunning coupling 38, clutch 50, shaft 39, and worm gearing 40 to the cam drum which carries a control disc 21. A branch train from the shaft 37 including an overrunning coupling 41, shaft 42, and worm gearing 43 drives a control shaft 25. At the end of a working stroke the cam drum is quickly rotated to shift the roller from position 19 to 22 in preparation for the quick return movement, and after the approach movement the cam drum is again quickly rotated to move the roller from 28 to 31 at which point the slow working rotation begins. The shaft 34 drives bevel gears 45 and gears 46, 47 which are associated with couplings 48, 49 respectively. When these couplings are engaged high speed movement is imparted to the cam drum and to the control shaft 25, the low speed drives being overrun. The ram 23 is supplied by a pump 51 driven from the shaft 34. When the cam drum reaches the position 19 with respect to the roller a lug 20 on the control disc actuates a linkage 52 to release a detent 53 and allow a spring-pressed member 54 to fall so as to disengage clutch 50 and operate a member 56 to engage a clutch 58 with a gear 59 coupled to a wheel 60 on a onerevolution control drum 61 driven from shaft 34, the revolution of the control drum being started by the descent of the member 54 acting through a rod 64. This causes the cam drum to be driven between positions 19 and 22. During rotation of the control drum a cam 69 thereon actuates a lever 70 to operate the control valve 27 of the hydraulic gearing to admit fluid through line 73 to withdraw the ram 23 and the turret slide at high speed. During this movement a lever 74 engages a lug 75 on a selector stop bar 92 to rotate a shaft 77. This acts through linkage 79 to rotate the valve 27 so that the pressure fluid passes to exhaust and the withdrawal movement is arrested. Further a lever 82 on shaft 77 acts through linkage 83 to engage a one revolution clutch 84 to actuate gearing 85 .. 88 and index the turret 8. At the same time the stop bar 92 is also indexed. A lug 26 on the control disc 93 now operates the valve 27 to allow fluid to pass to the other side of the ram 23 and effect the next quick approach movement of the turret slide, towards the end of which a stop 95 acts to rotate shaft 77 and operate the valve 27, so that fluid is admitted to a piston 97 which is then moved downwardly to release a catch 57 from member 56, which is then moved up by a spring to engage clutch 50. At this time the clutch 48 is already in engagement so that the cam drum 10 is driven at high speed from 28-31 and the control drum 61 is stopped. This movement is terminated by lugs 30 acting on the linkage 102 to disengage clutch 48, whereupon the cam drum is driven at low speed for the working movement.