Patent GB-191313857-A (GB)
Title: Improvements in or connected with Machines for Cutting and Forming Teeth of Toothed Wheels, and for other purposes.
Inventor: ROWLANDS WILLIAM ELLISON
IPC: B23F1/06
Filed: 1913-06-16
Granted: 1914-06-11
Abstract: 13,857. Rowlands, W. E., and Rowlands, r. W. June 16. Machines and apparatus.-Machines for cutting spur and bevel gears and machines for similar purposes have an interlocked hydraulic control system for the cutterslide feed, and the indexing-mechanism for the work. In the embodiment described (a form cutter, blank slide and cutter pillar, machine for spur gears), the control system is also interlocked with an hydraulically-operated screw-jack which supports the wheel rim during the cut. In operation the cutter slide descends for a cut, returns and dwells. During the dwell, the jack is lowered and the blank indexed, the completion of the indexing raising the jack and putting on the feed. The cutter is driven by a gear 12, Fig. 2, linked to a pinion 10 on a pulley shaft slidably mounted at 14. The cutter slide 5 is connected at 6 to rams 4 working in cylinders 3, and carries a rod with tappets 28, 29. During the cut, water is supplied to the upper cylinders 3 by a valve 25, the position of the parts being as shown in Fig. 3. The lower cylinders exhaust through a choke valve arranged as a by-pass to a non-return valve permitting free flow in the opposite direction to give a quick feed on the idle return. On completion of the cut, the tappet 28 operates a lever 37 on the lever 30, which is held up by a detent 41 and rocks the lever 37 to trip the detent. A ram 43 throws over the lever and reverses the valve 25 from the quick return. A latch 45 has now engaged a lever 46 and on the tappet 29 coming into operation the lever 30 is only permitted to rise sufficiently to bring the valve 25 into mid position in which the ports leading to both upper and lower cylinders are both closed, thus locking the cutter slide against movement. At the same time, the lever 46 is rocked and acts on the pawl 61 to trip a one-revolution disk 62 and depress the valve 33. Pressure is thus exhausted from the cylinder 40 and the spring 68 depresses the shoulder 70 below the detent 41, which again assumes the operative position. Pressure is also exhausted from a cylinder 92 and from a duct 97 leading to the jackcylinder 96, Fig. 11. Pressure is admitted at 63 to a cylinder 64 with a fixed ram and provided with teeth 66 meshing with a pinion connected to the disk 62 through a ratchet clutch permitting the ram to return without rotating the disk which is geared to a shaft 80 connected through change gearing 84, Fig. 2, to the index-worm. On exhaust of pressure from the cylinder 96, a spring 104 slides a worm 101 to rotate a wheel 99 joined as a nut on the jack 98 to lower the jack. The position of the jack stroke is adjusted by rotating the worm by the hand-wheel shown. On completion of the stroke of the cylinder 64, a tappet 70 trips the latch 45 and the pawl 61 is freed with the notch on the completion of the revolution of the disk 62 by the ram 57. The cylinder 64 is exhausted and pressure is admitted (1) to the small cylinder 92 for the idle return of the cylinder 64, (2) to the jack cylinder to raise the jack, (3) to the cylinder 40 to complete the movement of the lever 30 and shift the valve 25 for the cutting-stroke, thus completing the cycle.