Patent GB-497439-A (GB)
Title: Improvement in feed mechanism controls for automatic lathes and like machine tools
IPC: B23Q5/34
Filed: 1937-06-24
Abstract: 497,439. Automatic lathes. JONES & LAMSON MACHINE CO. June 24, 1937, No. 17644. Convention date, July 18, 1936. [Class 83 (iii)] A feed mechanism control for automatic lathes &c., wherein a toolsupporting member is movable in one direction relative to a work holder, comprises a plurality of relatively adjustable stops selectively presentable into operative position to bring about the stoppage of the tool at predetermined points, and means for rendering all the stops ineffective without altering their relative adjusted positions. The turret base 1 is rotatably mounted on a cross-slide 3 provided with a circular boss 4, Fig. 2, to which the base 1 may be clamped between inclining motions by a ring 5. The slide 3 carries a plate 10 with an extension 11 in which one end of a square &c. bar 13, Fig. 5, is journalled. The bar is grooved at 14 and provided with threaded holes 15 and clamping- bolts 140 of angle stop elements 16. Each face of the bar may carry one or two stops. The bar may be rotated to bring any selected stop or pair of stops into action. A fixed safety stop 19, Fig. 5, may be secured to extension 11 to prevent inward over-travel of the slide 3. The saddle is traversed longitudinally by a rack 26 and pinion 27, Fig. 3. A power-feed shaft 28 extends along the bed 25. The turret saddle has an apron portion 30 around the shaft. This carries a long gear 31, Fig. 11, which engages a short gear 32 on a sleeve 33 with a second gear 34 on a stub shaft 134. This provides a reverse, cross-slide drive which can be idle or operative. A sliding gear 35 on a shaft 36 may be driven directly by the gear 31 or reversely by the gear 34. A handle 350, Fig. 3, determines the direction. The shaft 36 drives a shaft 37 through a variable-gear slidable-sleeve 38, and shaft 37 drives through a second sliding-gear sleeve 41 and safety slip clutch 42, a worm shaft 40. The sliding gears may be actuated by a handle 45, Fig. 3, as described in Specification 448,369. The worm 48 drives a wheel 50 secured to a sleeve 52, Fig. 10, with a gear-portion 53 in mesh with a gear 54 on shaft 55. The gear 54 is integral with , a clutch sleeve 56 which may engage a similar sleeve 57 axially movable on shaft 55. Sleeve 57 is biassed out of gear by springs 58, and engages a cam plate 59 of a knock-off lever 60 arranged as shown in U.S.A. Specification 2,006,155 and provided with a pivoted portion 61 engaged by latch mechanism 62. The gear 57 through gears 65, 66 drives a pinion 67 geared to a cross-feed screw 68, Figs. 2, 10, which engages a nut 170 on the turret saddle. The position of the gear 35, Fig. 11, determines the direction of traverse. The sleeve 52 may, through a clutch, drive wheel 71, shaft 72 and feed pinion 27. The clutch 70, which is unclutched by springs 73, is held in action by a knock-off lever 75 and handle 76, Fig. 3. This lever, which controls the stopping of the saddle traverse, may be actuated by stops as described in U.S.A. Specification 2,006,144. The knockoff actuating mechanism for the cross slide may positively stop the cross-feed at any of a plurality of selected positions by means of shaft 13, and also when it reaches mid-position on the outward direction of motion of the turret slide. The lever 60 may be released by the mechanism shown in Fig. 8. The pin 80 is projected against the resistance of spring 81, as described in U.S.A. Specification 2,006,144. The released lever 60 swings down into position where the clutch 57 is disengaged from member 56, Fig. 10. The rock-shaft 82, Figs. 5, 6, 8, has a lateral projection 83, and at one end is cut away to form a rectangular projection 87 which lies in the path of the stop 16. The stop 19 may also engage it. The bar is rocked on contact to move the projection 83 to the left, to project the pin 80 and release the knockoff lever to disconnect the power feed. The opposite end of the bar 82 carries a handle 88 for hand manipulation, and to permit its withdrawal against the resistance of spring 802 from co-operation with the stop 16. The bar is turned out of its working position to hold it out of action. Means are provided to ensure the return of the cross-slide to its exact midposition. The shaft 82 has a cut-away portion 90 forming a shoulder 91. This is engaged by a shoulder on a second rock-shaft 95 at rightangles thereto, Figs. 5, which may rock the shaft 82 in the release direction by an axial movement thereof. The end of the shaft 95 is cut away and forms two stops 98, 103, Fig. 5. The stop 98 engages a part 99 on the cross-slide when it passes forwardly beyond its central position. The stop 103 engages the part 99 at the central position. A handle 100 on shaft 95 may engage either of a pair of stops 101, 102 to cause the stops 98, 103 respectively to be operative. The end 98 acts as a limit stop similar to the part 19.