Patent GB-345559-A (GB)
Title: Improvements in and relating to turning lathes
IPC: B23B5/00
Filed: 1930-05-15
Abstract: 345,559. Lathes. FAœDI, F., 190, Hansa-Allee, Oberkassel, D³sseldorf, Germany. May 15, 1930, No. 14971. [Class 83 (iii).] A multiple tool-holder lathe has a number of tools arranged side by side on a carrier which is movable along the axis of the lathe on a carriage movable transversely to the axis and indexed by the rearward movements of the carrier. As applied to a lathe for machining the ball-sockets of universal joints a drill 10a, Fig. 4, and a seamer 10b are secured to the carrier 8 which is movable axially for feeding the tools on the carriage 7, Fig. 1, which is slidable on transverse ways 6 on the lathe bed 1. A third tool 10c is provided for forming an annular recess in the bore of the socket X and is attached to a supplementary slide 14 which is movable in transverse guides 12 on the carrier 8 by means of a cam 17 rotatable by a hand-lever 20. An adjust. able screw stop on the carrier engages the lever and limits the depth of the recess formed whilst springs 22, 23 return the cam and slide to the inoperative positions. A plate 13 covers the guides 12. The carrier is fed by a hand-wheel 28 connected by a shaft 26 to a pinion 25 engaging a rack 24 on the carrier which is also provided with a bracket 53 notched at 54 to engage a roller 52 on a slide 47 so as to cause the slide to move with the carrier. A lever 44, Figs. 1 and 2, pivoted at 46 to the slide 47 is pressed by a spring 50 into contact with a cam 43 secured to the vertical spindle of a pinion 32 which engages one of two transverse racks 33, Figs. 1 and 4, attached to a frame 31. The frame is movable by a hand-lever 40 connected by a shaft 39 to an eccentric 38 engaging a recessed lug 36 on the frame so as to cause either rack to mesh with the pinion and determine the direction of travel imparted to the carriage 7 through strips 35 on the carriage in contact with the ends of the frame. During rearward movement of the carriage to bring the tools away from the work a pin 63, Fig. 1, on the slide 47 engages an inclined projection 61 on a lever 60 which lies on a shoulder 62 on a spring bolt 57, thus withdrawing the bolt from an aperture in a transverse notched bar 55 secured to the carrier 8 and allowing the latter to be indexed by engagement of the lever 44 with the cam 43. As the carrier continues its rearward movement the lever 60 and bolt 57 are released by the pin 63 to allow the spring 58 to snap the bolt into the succeeding notch of the bar 55 when the corresponding tool is opposite the work. During the forward feeding movement of the carrier the pin 63 rides under the projection 61 and raises the lever 60 against its spring 60a without affecting the bolt 57. To return the carriage 7 after completing a work-piece the frame 31 is moved by the lever 40 and eccentric 38 to bring the other rack 33 into engagement with the pinion 32, whereupon the carrier 8 is given several reciprocations by means of the hand-wheel 28, depending on the number of tools in use. Chucks ; operating-mechanism connected to brake on spindle.-The work X is gripped by spring jaws 5c joined at 5a and having a conical rear part 5b which is drawn into the bevelled end of the hollow lathe spindle 4 by means of a drawbar 70. A handlever 74 is pivoted to a stationary bracket 75 and carries a yoke 74a connected by pins 76 to a sleeve 73 slidable on the spindle and engaging a disc 71 on the draw-bar through fingers 72. Two brakeshoes 82, 83 are pivoted at 84 to a pillar 85 on the lathe bed and embrace a drum 81 adjacent the cone-pulley 80 on the spindle. When the chuck jaws are closed on the work the brake shoes are forced apart by a wedge 86 slidable in brackets 87 and connected by a link 90 to the lever 74, whilst when the jaws are opened for changing the work the shoes are applied to the drum by springs 88, the drive having been disconnected previously.