Patent GB-304260-A (GB)
Title: Improvements in lathes having longitudinal and transverse tool slides
IPC: B23Q5/34
Filed: 1927-10-18
Abstract: 304,260. Heinemann, W. Oct. 18, 1927. Turning.-A lathe having front and rear tool slides for traversing and surfacing respectively has two lay shafts and a control lever for each, oscillation of the levers in one direction producing a slow feed and in the other direction a rapid feed. A pair of discs are driven by the shafts and carry adjustable dogs for actuating the respective levers automatically. The lathe spindle 1 , Fig. 3, drives, through gearing, a shaft 2 which carries two worms 3, 3<1> engaging worm-wheels 5 rotatable on the lay shafts 4, 4<1>. Each shaft has splined thereto a sleeve 25, Fig. 1, which, when moved axially in one direction engages a clutch 21 with the worm-wheel to effect the slow feed of the slides and when moved in the other direction causes clutch parts 50, 51 to be pressed against a gear wheel 46 to effect the rapid feed. Axial movement of each sleeve is produced by a lever 22 carrying a screwed bush 23 and acting through ball thrust bearings 24, 47. The high speed gear wheels 46 are driven from a gear 45 on a hollow shaft 44 driven through a clutch 43 controlled by a hand operated rod sliding through the shaft 44, bevel gearing 40 and a shaft 39 belt driven from the lathe spindle. Each tool slide carries a rack, that on the facing slide being in engagement with a pinion on a vertical shaft driven by bevel gearing 15 and a shaft 8<1> connected by change gears 7<1>, 6', to the lay shaft 4<1>, while the rack on the traversing slide is engaged by a pinion 12 on a shaft 11 driven through gearing 10, shaft 8 and change gearing 7 from the lay shaft 4. The facing slide may also be moved longitudinally by means of a shaft 17 rotated from the bevel gear 15. Concentric with each of the shafts 4, 4<1> is mounted a disc 31 rotated through gearing 37, 36 respectively from the shafts 8, 8<1>, each disc carrying adjustable dogs 32, 58 for actuating the levers 22. A recessed pin 29 is pivotally mounted near each lever and may be oscillated by a hand lever 61. To impart a slow feed to the traversing slide the lever 22 is oscillated by hand to the left to engage the clutch 21 and is maintained in this position by a square projection 28 on the lever engaging the pin 29 until the dog 32 trips the lever 61 and allows the lever 22 to be oscillated by a spring 30 to release the clutch. If it is desired to engage the rapid reverse. traverse automatically as soon as the forward traverse is finished, a piece 54 on the lever 22 is adjusted as shown in Fig. 3, whereupon the spring 30 may oscillate the lever past its neutral point into contact with a dog 55 on a disc 56, freely rotatable on the hub 53 but anchored bv a spring y, and thereby engage the clutch 50. 51. At the end of the rapid traverse a dog 58 on the disc 31 returns the lever 22 to its neutral position. In order to stop the slow feed of the traversing slide without engaging the rapid reverse, the piece 54 is rotated to the opposite sida of a pin x on the lever 22, whereupon the spring 30 can only oscillate the lever into its neutral position, i.e. with the piece 54 in contact with the dog 55. From this position the lever 22 mav be oscillated bv hand against the spring y. When the levers 22 are in neutral position the slides mav be actuated by hand wheels or cranks 62. The facing slide is similarly onntrolled, with the exception that the spring 30 is replaced by a weight 30<1>.