Patent GB-190103342-A (GB)
Title: Improvements in Turret Lathes
Inventor: JOHNSON JAMES YATE
Filed: 1901-02-15
Granted: 1901-05-18
Abstract: 3342. Johnson, J. Y., [Enterprise Manufacturing Co.]. Feb. 15. Lathes.-An automatic turret lathe for operating on separate identical blanks is provided with a hopper feed to enable the blanks to be automatically chucked. The hollow spindle C is driven by loose cone pulleys C<2>, C<3>, either of which can be clutched to it to run the spindle in opposite directions. The clutches are operated by cams b<2> on a drum B<2> through a rod C<5>, rock-shaft, arm C<4>, and sliding collar c<2>. Roughing and finishing tools are mounted in ordinary holders D', D' on opposite sides of the lathe on a slide D, operated by a lever D<3>, pivoted at d, d on the front of the machine and operated by cams e, arranged in annular grooves on a disc E and acting on a roller d<2> on the lever. The disc E is driven from the cam shaft B carrying the drum B<2>. The cam shaft is driven by a cone pulley (not shown) at the back of the lathe and variable-speed friction gear f, f<1>, 16 (shown in dotted lines) regulated by an arm M on a rock-shaft M', operated by an arm m and cams m<2> on a disc B<3> on the cam shaft. The arm M is temporarily held in place by a spring pin n on its upper end engaging a fixed toothed plate N. The friction gear drives a worm shaft B<4> and wheel b on the cam shaft through differential gearing controlled by a lever I, link I<2>, lever I<1>, and cam b<4> on a drum B' acting on a roller i<2> on the lever I<1>. The turret J is mounted on a slider j, reciprocated by an arm on a rock-shaft K, which is rocked by the engagement of an arm K<2> with a slide K<3> reciprocated by cams on the drum B'. The turret is rotated one or more steps at a time by toothed segments l<1> of suitable length on the disc B<3>, which engage a pinion l feathered on a shaft L, operating the turret by the mechanism shown in Fig. 13. The turret J revolves in a casing J<1> with a coned seat on which bears a ring 3, held against rotation on the turret and pressed down to take up wear by rods 4 and a screwed ring 5. The turret is rotated by a pin g on a wiper 8 engaging slots in a wheel 6 secured to the turret. The boss of the wiper is formed with a bevelled segmental portion opposite the pin to engage corresponding recesses between the slots in the wheel 6, and thus lock the turret in the adjusted positions. The wiper and the wheel 10 by which it is driven from the shaft L are loose on a pin 11, and are pressed up by a spring 14 to ensure accurate locking. The turret is clamped by a bolt 20, to the lower end of which is pivoted a link 22, to which is pivoted a bellcrank lever 23, the short arm of which is fulcrumed in the bottom of the casing J<1>, and the long arm of which is depressed by a cam 24 on the shaft L to release the turret. The clamping is effected by a spring plunger 25, which presses the link 22 towards a vertical position. The chuck P for holding the work is of the split cone type, the jaws being carried by a tube extending through the hollow spindle. A screwed sleeve, held longitudinally on the tube, engages the internally-screwed rear end of the spindle, and carries a ratchet-wheel R<2>, which is normally clutched to a bevel-wheel S' by a spring clutch ring S. Pinions p<3>, on studs secured radially to the spindle, connect the wheel S<1> to a similar wheel T, carrying a ratchet-wheel T', both bevel-wheels being loose on the spindle. A slide u on a slideway U at the front of the machine is moved by cams on the drum B<2> to interpose a stop u<3> in the path of the wheel T' or a stop u<2> in the path of the wheel R<2>, or to release both wheels. When the wheel T' is held, the wheel T causes the pinions to drive the wheels S', R<2> and to rotate the screwed sleeve, drawing back the tube carrying the jaws to grip the article. When the grip is sufficient, the clutch ring S slips, the slide then being moved to release the wheel T'. The blank remains gripped till the slide moves to hold the wheel R<2>, causing the sleeve and tube to be screwed forward to release the blank. An ejector rod V with a grooved disc v is then operated by an arm on a slide at the back of the lathe similar to the slide u and operated from the cam drum B<2> The rod may merely eject a blank, or may be used in conjunction with a turret tool to transfer a blank from the hopper to the chuck. The hopper feed-mechanism comprises a frame 27, Figs. 1 and 16, secured immediately over the chuck, and serving as a guide for a slide 29, Fig. 20, vertically reciprocated at the desired intervals by a segment 34 operated from the cam shaft. A cap plate 30, secured to the frame in front of the slide, is vertically grooved at 32 to receive the blanks (not shown). The slide has a carrier 50 at its lower end into which the lowest blank can fall when the carrier is in its upper position shown in Fig. 16, an opening in the carrier being then adjacent to the grooved cap plate. The rear of the carrier is toothed to engage a loose rack 49 in the slide which also engages a mutilated wheel 44, mounted on the rear of the slide and carrying a mutilated pinion 43. A lug 45 on the wheel 44 travels in grooves 46, 47 in the frame. When the slide is caused to descend with a blank in the carrier, a detent 55, pivoted at 53, is pushed forward by a spring plunger 56 to hold up the remaining blanks, and the end 65 of a spring catch 63, pivoted at 62 on the carrier, moves inwards to hold the blank in the carrier. The pinion 43 engages a short rack 52 fixed on the frame, imparting to the pinion, and consequently to the carrier, a half revolution, transmitted through the loose rack, a widened recess 48 allowing the lug 45 to pass from the groove 46 to the groove 47. When opposite the chuck the blank is gripped, the catch 63 yielding as the slide ascends. The carrier is again inverted and returns to its initial position, the catch 63 and plunger 56 being pressed back by the engagement of an arm 64 on the catch with the plunger head, allowing the lowest blank to press back the detent and fall into the carrier. A second catch and detent may be provided if the blanks are of irregular shape.