Patent GB-723093-A (GB)
Title: Improvements in single spindle chucking machines
IPC: B23B5/00
Filed: 1951-01-10
Abstract: 723,093. Lathes. FAIRWEATHER, H. G. C. (National Acme Co.). Jan. 10, 1951, No. 768/51. Class 83 (3). A single spindle chucking machine comprises cross slides 32, 34 mounted on the front of a housing, independent motors for the spindle and slides, means for connecting the spindle and slide drives, and hand controlled means on said front for controlling the machine. The lathe comprises a forming or facing cross-slide 32, Fig. 2, and a second crossslide 34 bearing a third slide 35. for taper or form-turning or boring. Beds and framings; catching cuttings.-The machine is built so that the operator can stand in front of the spindle. All change-gears and cams are accessible by removing cover-plates. The machine base includes a pan having outlets for cuttings. Taper-turning; copying.-The axiallymovable slide 35 is actuated by a pull-rod 35b attached at 35a. The depth of movement is determined by an adjusting screw 109. For taper work the slide is mounted at an angle. For form-turning, or-boring, a combination holder is mounted on the slide 35 and is controlled by a cam on the surface 36. Operation. In operation, the " Start " button Fig. 2, is pressed to start a main motor M which, through change gearing and a gear 5, Fig. 9, rotates the spindle 1 carrying the chuck. A pedal at the front of the machine is then depressed to actuate a solenoid, causing a chuck-operating draw-spindle to be moved rearwardly by an air cylinder 11 attached at 11a, Fig. 9. The pedal is operative only when the cross-slides are in their withdrawn positions and a snap-lock-switch 108 has been actuated. Brake-actuating mechanism.-A lever S is moved forward, operating an air-valve and causing an air piston to move a yoke 7, Fig. 9, and engage the spindle-driving clutch. 6. The lever S also actuates a switch to start an independent high-speed motor 56, Fig. 4. The main-spindle is stopped at any time by rearward movement of the lever S which engages a braking clutch 8. Feed-motions.-To start the feed movement of the slides, the operator pulls forward a lever F which actuates an air piston to move a rod 63 and engage a clutch 42, Fig. 11. The drive is taken off a gear 4, Fig. 9, which rotates a worm 22. The drive is taken from the worm 22 via change gears 52, the clutch 42, shaft 38 and worm gearing 71 to a cam-shaft 25, on which the gear 71 is mounted, and cam shafts 26, 27, Fig. 13. The shaft 25 carries a camdrum to actuate the slide 35 through lever means and the rod 35b and the shafts 26, 27 carry drums 31, 33 to actuate the slides 32 and 34. The feed is stopped at any time by rearward movement of the lever F. The tool slides are returned at high speed by means operated by a cam 48, Fig. 4, on the shaft 25. This cam moves a lever 49, thus turning a shaft 59 to move a yoke 62, Fig. 11, and engage a clutch 46 on a gear 55. The gear 55 is geared directly to the independent high speed motor 56. An over-running roller clutch 65 enables the slow feed drive to continue running without interruption. When the machine cycle is complete, a cam on the periphery of the cam-disc 48 operates the snap lock-switch L, Fig. 4, which causes the lever S to be moved backwards by a solenoid. If it is desired to withdraw the tools during machining a lever R is moved backwards. This movement releases a catch from the rod 63 and actuates the air piston controlling that rod to disengage the clutch 42 and engage a clutch 45. The clutch 45 is rotated at high speed from the motor 56 by a chain-drive on the gear 55. At the end of the return movement, a cam on the gear 71 moves a lever 68 to move the rod 63 and place the yoke 43 in neutral position. The clutches 42, 45 may be actuated for adjusting purposes by a hand lever (not shown). A push-button is provided for jogging the spindle, and a handle 40 is provided for turning the cam-drive worm 39, for setting-up purposes. Stop-motions.-If air-pressure falls below a, certain value, all motors are stopped. The pressure of the air actuating the chuck can be adjusted and is indicated by a gauge. Lubricating machines.-A gear on the shaft of the motor 56 drives a lubricating-oil pump, the pump passing the oil through a filter 0, Fig. 4. Lubricating and cooling tools and work.- Lubricant is supplied by a motor 57, Fig. 4; to a funnel nozzle 104. The supply is stopped automatically by a valve actuated by the slide 32 on its return movement.