Patent GB-190900924-A (GB)
Title: Improvements in Lathes.
Inventor: SIMPSON THOMAS
IPC: B23B3/00
Filed: 1909-01-14
Granted: 1909-11-11
Abstract: 924. Simpson, T. Jan. 14. L a t h e s.-A turning- lathe fur sliding, surfacing, boring, screwcutting, &c, and for taper-turning, is provided with a movable bed capable of moving longitudinally or transversely, or of swivelling on a fixed bed. The change - feed gear and change-speed driving gear are contained in the driving-head. The change-feed gear is used for screw-cutting, the same control levers being also used. The screwing feeds are used for sliding, surfacing, and boring feeds. The movable bed 18, Figs. 3 and 16, can be adjusted by screws 83 in the end standards 9, 17, the screws actuating nuts 139. The bed is locked in position by the rotation of a spindle 80 which actuates a bolt 79 through worm gearing. The bed can be moved longitudinally by means of a screw 84, which engages aswivel nut 85 in the support 9 and is provided with shoulders engaging an extension 18<a> on the movable bed. An extensible connexion allows of this movement of the bed. The tool carriage 19 is traversed by a screw 46, adjustable as to height and operated from the driving-head, through the extensible connexion and through gearing 76, 77. Two tool rests 87, 88 are provided, one 87 for surfacing, being fed automatically, and the other being fed by hand. The rest 87 receives motion from the screw 46 through worm and other gearing and clutch connexions. The surfacing - tool is fed forward by a nut on the tool rest. Should the tool encounter undue resistance, one of the clutch connexions breaks down. Pins on the tool carriage carry a double clasp nut to engage the screw 46 for traversing the carriage when boring or screwcutting. A handle operates the screw gearing for the clasp nut, and a spring is employed, the arrangement being such that when the clutch is in engagement for surfacing work the clasp nut is disengaged, and vice versa. A similar handle serves to feed the surfacing -tool by hand. The tool carriage may be traversed longitudinally by hand. The second tool rest 88 is fed by hand-operated screw- and-nut gearing. The change gear for the headstock spindle is shown in Fig. 7. Any of the change-wheels 33 or 42 can be keyed on their respective shafts : the change-wheels 31, 32 are all keyed to their shafts. The key-piece 36 is attached to the slide 35, which is operated from the handle 41 by means of a hollow spindle 40, a crank 39, and a collar 38. A handle 45 operates the key 36<a> through the medium of spindle 44, a forked crank 43, and a collar 38<a>. The change-feed gear comprises a set of wheels 54 loose on a shaft 53 and gearing with a set 57, keyed on a spindle 58 and another set 59, keyed on the spindle 58, gearing with a set 60 loose on a shaft 61. Either wheel of the loose sets may be connected to its shaft by sliding keys controlled by hardles 56, 64. The shaft 61 is connected to the guide-screw by an extensible connexion 72, which consists of two universal joints coupled together. A fork 69, Fig. 8, a pin 70, and a block 71 transmit motion by a similar arrangement to the feed-screw 46. A taper slip serves for taking up slack and maintaining the tailstock in alinement with the fixed head. The tailstock is in one piece, has no overhang, and is clamped by a plate which extends the whole length of the tailstock.