Patent GB-190406203-A (GB)
Title: Improvements in Feed Motions for Automatic Lathes.
Inventor: HERBERT ALFRED
Filed: 1904-03-14
Granted: 1905-01-12
Abstract: 6203. Herbert, A., and Vernon, P. V. March 14. Lathes.-Full automatic lathes have their cam shafts driven at a speed always proportional to the speed of the spindles, the particular ratio being determined by intermediate variablespeed gearing controlled by the cam shafts themselves. Two speeds are provided between the spindles and the main driving-shafts, and the latter are connected to the variable-speed gears through ordinary chain gearing and through gearing arranged to continue to run in the same direction even when the spindles are reversed. A constant high speed for the idle motion of the cam shafts is obtained from separate belt pulleys driving through clutches, and the low-speed gears are provided with a release for setting the machines by hand. The lathe spindle 56, Fig. 18, carries wheels 54, 55, arranged to gear with wheels 52, 53, connected together and slidable on the main shaft 51. A wheel 57 on the shaft 51 gears with wheel mounted on a stud adjustable in a swing arm 60, and rotating with a wheel 61 also mounted on the stud and driving a wheel 62 on a shaft 45, Figs. 4 and 6. A wheel 47, loose on the shaft 45, gears with a pinion 49, meshing with a pinion 48, driven by a wheel 46, fast on the shaft 45. The wheels 46, 47 will thus rotate in opposite directions. Clutch-pieces 50<b>, Fig. 12, are mounted in the wheels 46, 47, and engage a sliding piece 50<a>, mounted in a pinion 50, loose on the shaft 45, and gearing with one of a set of wheels 36, secured to a shaft 37. As shown in Figs. 4 and 6, the wheel 46 is the driver ; if the motion of the spindle be reversed, the piece 50<a> is moved across to engage the pin 50<b> carried by the wheel 47, and the shaft 37 will continue to rotate in the same direction. A set of wheels 35, meshing with the wheels 36, are arranged to drive a sliding shaft 34 by means of a spring key 38. A worm 13 on the shaft 34 meshes with a wheel 14, Figs. 3 and 4, carrying a number of pawls engaging a ratchet-wheel 15 on a worm shaft 4 which drives the cam shaft 1. A disc 44 on the cam shaft carries on its circumference a number of adjustable plates provided with holes corresponding to the wheels 35. Pegs placed in these holes engage profile pieces carried by a lever 41, having a pin engaging collars 39 on the sliding shaft 34, and cause the latter to take up successive positions, so that the key 38 engages the wheels corresponding to the holes in which the pegs are placed. A second disc on the cam shaft has two grooves 21<a>, in which a series of dogs 20, Fig. 14, may be fixed in any required proximity to engage successively a pin 22 on a lever connected by segmental gearing and a rackbar to a lever 30, with an ordinary throw-over arrangement at 32, and a clutch fork 31 engaging a clutch-part 18, driven by a pulley 5 loose on the shaft 4. When the clutch 18, 19 is engaged, the ratchet-wheel 15 overruns the pawls. The worm 3 is driven from its shaft through a friction clutch 6. A block 6<b> is keyed to a ring 6<a> and to the shaft. A rod 7<a> has a wedge-end adapted to force a pin 6<c> against an arm 6<d>, Fig. 10, to expand the ring 6<a> to grip the clutch-case. A hand-wheel 8, normally held in the idle position by a spring 9, may be pressed in to engage clutch-parts 11, 12 for the rotation of the worm.