Patent GB-945558-A (GB)
Title: Drive mechanism for the feed movements in machine tools, in particular for the feed movements of lathe tool-slides
Inventor: SEIFERT WOLFGANG
IPC: B23Q5/34
Filed: 1961-01-27
Abstract: 945,558. Lathe details. GROSSDREHMASCHINENBAU & MAI VEB. Jan. 27, 1961, No. 3298/61. Heading B3T. A worm-wheel 23 connected to the drive for the traverse and cross tool slides of a lathe is driven for normal feed of the slides from a shaft 5 slidable in the apron 4 of the lathe carriage, and for rapid return by a high-speed motor 12. A gear 6 rotatable with and slidable on spindle 5, drives worm-wheel 23 in one direction via gear 8, clutch 18, 19, gears 16, 21, and worm 22, and in the other direction, through gears 11, 10, clutch 17, 19, gears 16, 21, and worm 22. With the clutch disengaged, worm-wheel 23 is driven at rapid return speed by motor 12. Adjacent worm 22 a collar 24 on shaft 20 is in contact with a sleeve 25 non-rotatably but slidably mounted on the shaft, and rotatably and slidably carried by wall 2 of the carriage. A further sleeve 27 is slidably connected to shaft 20 by a pin 27<SP>1</SP>, and is slidably and rotatably carried by wall 1, sleeves 25, 27 being urged apart by a spring 26. The end of shaft 20 is rotatably but non-slidably connected to a bar 29 which is secured to a slidable bar 29<SP>1</SP>, having a block 30 secured thereto. A bar 33 mounted in walls 3, 4, coaxially with bar 29<SP>1</SP> is slidable against springs 39, 40, has a clutch fork 38, and a block 34 secured thereto. A member 31 pivotally mounted about a pin 32 has pegs 31<SP>1</SP>, 31<SP>11</SP>, which engage with block 30, and the end of the member engages a recess in a pin 47 slidably mounted in a housing 49. When member 31 is pivoted by the sliding of bars 29<SP>1</SP>, 33, pin 47 is retracted from a quadrant 45 against the action of a spring 37 which engages a stop 48 secured to the pin. Block 34 has a lug 34<SP>11</SP> which engages a lug 36<SP>1</SP> on a spring-urged locking piece 36, and a groove 34<SP>1</SP> which engages a key 46 secured to quadrant 45, the latter having holes 45<SP>1</SP>, 4511 for engagement by pin 47. Quadrant 45 is secured to a fork end shaft 42 rotatable on a flange 44. A toothed quadrant 41 carried by the fork of shaft 42 is pivotable about a pin 35b by a lever 35, so that a rack 43 connected to the clutch for the tool slides, may be actuated. A switch 53 for cutting in motor 12 as required, is actuated by a bar 51 in lever 35, operated by a button 50. In operation, lever 35 is moved from position N to position L<SP>1</SP> in the gate, Fig. 6, thus switching to traverse feed via rack 43, and engaging clutch 18, 19, to drive work 23 and feed the traverse tool slide towards the lathe headstock. As lever 35 moves from L to L<SP>1</SP>, block 34 moves to the right so that lug 36<SP>1</SP> of locking piece 36 engages behind lug 34<SP>11</SP>, and pin 47 engages hole 45<SP>1</SP> in quadrant 45. To terminate the feed manually, lever 35 is moved to L, pin 47 is withdrawn, from hole 45<SP>1</SP>, and moves locking piece 36 against spring 37, and spring 40 moves bar 33 to disengage the clutch. To disengage the drive when the tool slide engages a stop, worm-wheel 23 stops, worm 22 moves to the left to tension spring 26, and bars 29, 29<SP>1</SP> are also moved to the left. Member 31 is rocked by block 30, and pin 47, and locking piece 36 are withdrawn to allow spring 40 to move bar 33 to disengage the clutch. Movement of lever 35 to L2 feeds the slide towards the tailstock and positions P1, P2, of lever 35, drive the tool cross-slide. Rapid return of the slides is effected when lever 35 is in positions L or P.