Patent GB-189809563-A (GB)
Title: Improvements in and relating to Engine Lathes and similar Machine Tools.
Inventor: BROOKES ALFRED GEORGE
Filed: 1898-04-26
Granted: 1899-03-25
Abstract: 9563. Brookes, A. G., [Draper Machine Tool Co.]. April 26. Lathes; f e e d - motions. -The invention is described with reference to the feed and screwcutting motions of a lathe, but may be applied to corresponding motions of similar machine tools to enable them to be more easily varied. Motion is transmitted from the lathe spindle to a feed-shaft B, Fig. 1, through the usual reversing-train and change or other wheels a<6>, b<10>, and toothed cones b, b<1>. The wheels of the cone b rotate together on a stud, but the wheels of the cone b<1> are independently r e - voluble o the shaft B. Any wheel of the cone b<1> can be locked to the shaft by a feather b<4>, Fig. 3, with a spring end b<3>, which can be slid along by a knob b<9>. Collars b<7> be. tween the wheels depress the ends b<3>, preventing it from locking two wheels and holding it in place when set. Fig. 4 shows a view of the saddle apron E from the rear. A cone e<x>, composed of toothed wheels keyed on a sleeve, is mounted in bearings e, e<1> concentrically with the leading screw C. Any one of these wheels may be connected to a pinion e<6> feathered on the feed-shaft by the arrangement shown in Fig. 6. A quadrant plate e<11> is pivoted on the hub of the pinion e<6>, and carries an intermediate wheel e<14> which can be swung into engagement with any one of the cone wheels. The position of the quadrant plate is regulated by an arm e<20> engaging notches e<16> in a cover plate e<15> on the saddle, and the quadrant plate is held by a spring pin F. The end of the cone in the bearing e is formed as one member of a clutch, the other member h<1>, feathered on the screw, being brought into engagement with it when the half nuts are closed on the screw. A pinion e<5> fixed on the cone sleeve gears with a pinion n which can be clutched to a worm shaft N on the saddle to actuate the traversing and surfacing slides. The worm-wheel spindle t<14> carries a pinion t<1> engaging a pinion t on a rock plate which can be swung to engage a pinion s<4> to operate the surfacing-screw S, or to engage a wheel s<5> operating the rack pinion s<6>, or may remain in the idle mid-position shown. The worm-wheel t<12> is clutched to its spindle by the usual clutch operated from the front of the saddle. Any one of the speeds given by the cones b, b<1> may thus be used with any one of the speeds from the cone e<x> to actuate the screw-cutting, traversing, or surfacing motions. To prevent the screw-cutting and feed motions from being simultaneously brought into engagement, the device shown in Fig. 8 is provided. The slotted plate k<2>, which causes the half-nuts to engage when the handle K is raised, simultaneously moves a bar P to the left by means of a pin k<15> and cam slot p<7>. This movement disengages the clutch n<1> n<2> on the worm shaft N and stops the feed. Lugs t<30>, t<31> may be provided on the rock plate carrying the wheel t to co-act with lugs p<8>, p<9> on the bar P and prevent its movement unless the rock plate is in its idle or mid position. A shaft R for actuating the reversing-train on the headstock may be operated from the saddle by a travelling handle M to reverse or stop the feed, or the shaft may be operated at any desired points by cams on the saddle engaging adjustable cams on the shaft.