Patent GB-141655-A (GB)
Title: Improved turret lathe or like machine
IPC: B23Q39/04
Filed: 1919-06-28
Abstract: 141,655. Potter, J. C. April 12, 1919, [Convention date]. Lathes.-In a turret lathe or like machine of the type in which a number of horizontal rotary work spindles are radially mounted on a table intermittently rotated on a vertical axis and concentrically arranged within a series of radial horizontal tool slides reciprocating on stationary guides, and one less in number than the work spindles, each work spindle at each working position may be driven at various speeds independent of the simultaneous speed of the other spindles. In the form shown, four radially arranged work spindles 10 are carried on a table 12 rotatably mounted in the framing 13 so that the work spindles may be successively brought into alinement with three radially arranged toolslides, while the work is being inserted or removed from the fourth spindle by the operator. The tool slide 76 carries a drill and a roughing-tool, the second slide, which is arranged at rightangles thereto, a boring-bar, and the third slide 78, a turret 79 carrying the finishing tools, the framing adjacent the first and second slides also carrying swinging arms 100 serving as crossslides. Three of the work spindles are independently driven from the driving shaft 26 or from a shaft 31 geared thereto, by a series of automatic change gears 30, 28 and 29, 27, removable change gears 24, 23, and gears 21, 19, the gears 19 being provided with clutch teeth automatically released from the clutch teeth 17 on the shafts of pinions 15 which are carried by the table and are geared to the work spindles. Each wheel 27 is connected to its shaft by a friction clutch operated by a dog wheel, and each wheel 28 is connected to its shaft by an automatic roller clutch. The clutches 17 are put in by a hand-lever 39, the shaft of which carries a toothed segment 41, Fig. 3, engaging a rack 42 on a disk 43 the upper surface of which has a cam groove engaging the levers 45 connected to the clutch collars; the clutches are removed by dog wheels. The clutch 36, Fig. 3, for the fourth spindle may be put in by a spring- retracted hand-operated lever 37 so that the spindle may be rotated for the operator to see if the work is properly centred. The clutch 52 for putting in the indexing mechanism is operated by a hand-lever 55, 56, which can only move when it is opposite a notch in the top of the hand lever 39, so as to ensure that the indexing mechanism is not put in until the spindle clutches are released. The indexing is effected from the driving shaft 26 through gearing, including worm gearing 50 and a shaft 490, which is connected by sprocket gear to a shaft which carries a mutilated pinion 47 engaging a mutilated gear secured to the base of the table. When the shaft 490 rotates, the spring locking-bolt 66, Fig. 4, is first removed from a recess in the table by a lever 71 and notched cam disk 72, and an expanding split ring 73 is released by the cam groove 75, withdrawing the lever 74. The indexing clutch is removed automatically after one revolution of the pinion 47 by a cam 58, which is in engagement with a lever 59 flexibly connected to the lever 55. In order that the lever 55 may be moved independently of the lever 59 to put in the clutch and yet be moved by the lever 59 to remove the clutch, the levers are provided with lugs 60, 62, Fig. 6, and a spring 64 is arranged between the part 62 and the head 63 of a pin 61 carried by the lug 60 and passing through the lug 62, the portion of the pin between the lugs being enlarged. The toolslides are independently reciprocated at speeds dependent on the nature of the operation being performed and at a speed co-related with the speed of the work spindle by a series of gears 21, 86, automatic change-speed gears 88, 89, including hand-changed gears, differential gears 84, and gears 96, 95 and 93, 92, connected to the shafts of the cam drums 80. The gears 89 are connected to their shafts by friction clutches operated by dog wheels and the wheels 88 by automatic roller clutches. The return movement of the slides is effected at constant speed from the driving shaft through gears 85. The swinging arms 100 are operated by cams 99 on shafts rotated by gearing 97, from the shaft 94 carrying the gears 95, 93.