Patent GB-190212323-A (GB)
Title: Improvements in the Construction of Multiple Spindle, Screw Making and Metal Turning Lathes.
Filed: 1902-05-31
Granted: 1903-05-28
Abstract: 12,323. Trueman, H. P., and Cleghorn, E. D. May 31. Lathes; screwing.-Relates to multiple-spindle lathes or screw machires for screwing and finishing parts formed from rods or bars. Fig. 1 shows a lathe having four spindles 2, mounted in a headstock 1, which is rotated at intervals, and is locked in the working-positions by a spring bolt, inserted by a cam 27. This bolt is withdrawn by the spring when the cam permits, and has a conical end to fit conical holes in the headstock. Any wear is taken up by a subsidiary spring. The headstock is rotated by worm gearing driven by a clutch which is put in gear automatically. In a modification, a continuously-moving chain has teeth at the required intervals, which move a chain-wheel, driving the worm gear of the headstock. The materials are fed through the spindles by a clamp-slide and a feed-slide, moved to and fro by adjustable camstrips 14, 18. These strips are flexible, and can be bent to any desired form, and secured by bolts in the slotted drum. The shaft 34 is driven at a constant speed, and drives the shaft 41 through two sets of bevel gear, automatically controlled by a clutch. When the head 3 is being drawn back, by the flexible and adjustable cam 5, and the headstock 1 is being rotated, the machine is driven at the greater speed. The rate of feed is adjusted by placing the pinion 68 in gear with the desired one of the wheels 63, on the shaft 34. The pinion 68 gears with another pinion 67, movable along the feed-shaft 65. To the head 1<a> is bolted a bracket, carrying a tool-slide 44, which is moved to and fro by a crank-pin in a slot 49. The crank-pin is rotated by a wormwheel gearing with the screwed spindle 50. The position of the slide is adjusted by rotating the spindle. The movements of the head 3 are transmitted by the stops 52, 52<a> to the spindle, which acts as a rack on the worm - wheel, and operates the slide. The bracket 45 may be mounted on the head 3, and the guide 46 on the head 1<a>. The cutting off slides are actuated by levers 80, having ball-and-socket joints to allow the slides to be set at any angle. Fig. 17 shows the screwing-device, which is driven in the same direction as the spindle 2, but at a greater speed. The die 55<a>, or a tap, is secured in a holder 55, having a stem passing through a sleeve 56, which can be adjusted longitudinally by means of a screwed sleeve 62. A pin 58 in the sleeve 56 engages a pin 57 in the holder, so that the holder is rotated by the sleeve. After the head has completed its forward movement, the pawl 59<a> engages a ratchet-wheel 59, and prevents the holder 55 from rotating, so that it unscrews itself from the work. The feed-spools are held in place, when empty, by spring - pressure balls 82, as shown in Fig. 13. Fig. 19 shows means for compensating for the wear of the tool-slide 3. The lateral wear is taken up by strips 84, screws 85, and clamping-bolts 86. The vertical wear is taken up by strips 87 and screws 88. Fig. 9 shows a reducing-socket, one end of which is screwed into the feed-tube, while the other is screwed on to the feed-shell. Chucks.-Fig. 6 shows the gripping-portion of a spring chuck. It is recessed at 5 to receive the split bush shown in Fig. 7.