Patent GB-190416006-A (GB)
Title: Improvements in Turret Lathes and like Machines.
Inventor: JOHNSON MOSES CARLYLE
Filed: 1904-07-19
Granted: 1904-09-15
Abstract: 16,006. Johnaon, M. C. July 19. Lathes.-Turret lathes are provided with cylindrically-seated tool-holders arranged to be brought successively into and locked in the operative position, together with a corresponding stop to determine the travel of the turret head, the motions being derived from the travel of the latter. The turret head 30, Fig. 3, has a number of cylindrical seatings 33 co-axial with the live spindle, and is rotatably mounted on a carriage 8, being kept in place by bearings 13, 8<1> and held down by a ring 29 engaging the flange of an indexing-ring 25 secured to the turret head. The ring 29 is screwed to the carriage, and is locked in position by a plunger a' adapted to enter one of a number of holes d in the ring. The plunger is depressed for adjustment of the ring by a rod inserted at e. The rod allows the ring to rotate with the turret head until the plunger is allowed to snap into another hole in the ring. The carriage 8 is traversed by a hand-wheel and pinion 23, and, when it is moved away from the live spindle, pins 35 on the turret head engage the end of a lever 39 pivoted to a bar 38 adjustably secured to the lathe bed. The lever 39 is normally held in the operative position by a spring pin 41, Fig. 10, bearing against a projection on the bar 38, and is cut away at 48 to clear the adjacent pin on the turret head. A bolt 49, which engages recesses 26 in the indexing-ring to lock the turret in position, is frictionally held by a gib 57 and is withdrawn prior to the action of the lever 39 on the pins 35 by a bellcrank lever 50. The gib 57 is held against a screw stop 58 by an adjustable spring plunger 61. The lever 50 has a forked end enclosing a bowl and carrying a projecting pin. The bowl engages a spring plunger 54 which normally holds the bolt in its locking position, and the pin engages a cam 43 on a lever 42 pivoted to the bar 38 and rides up an incline 43<2>, Fig. 10, turning the lever and withdrawing the bolt, which is held back by the part 43<4> of the cam during the indexing of the turret. The pin then escapes from the cam 43 and allows the plunger 54 to shoot the bolt again. The lever 42 is provided with a spring pin 44 similar to the pin 41 on the lever 39, and the levers have their travel limited by pins and slots 43', 39<3>. A tongue 14, Fig. 3, on the carriage slides between the shears and is bored longitudinally at 16 and vertically at 15, the bore 15 registering with a bore 31 in the turret head. The bore 15 may form the seating for a pivot pin for the turret head, but, preferably, receives an arbor for supporting the turret head during the cutting of the seatings, which is effected in position by means of a tool carried by the live spindle. The bore 16 receives a cylinder 71, Fig. 8, tored to receive adjustable stop-rods 82, Figs. 8 and 9, corresponding in number to the seatings on the turret head. The cylinder is held in position by a detent 84, Fig. 3, and is intermittently rotated through a pawl 79 carried by a cam-cylinder 69 oscillated by a bowl carried by a projection 66 on the bar 38. In a modified form of turret hoad, tool-holders are secured by T-headed bolts to slides operated by screws in the turret head. In the operation of the machine, the turret head and cylinder 71 are set to bring the required tool and stop-rod into line with the stock to be turned, and the carriage is advanced until the stop-rod contacts with a stop on the bed. The carriage is then returned, thus indexing the turret head and cylinder in a second position by the mechanism as described above, and so on until the work is completed.