Patent GB-843685-A (GB)
Title: Surface generating apparatus using rotary tools
IPC: B23Q35/10
Filed: 1956-09-17
Abstract: 843,685. Copy-milling; chucks. LAMBERT BRAKE CORPORATION. Sept. 17, 1956 [Aug. 15, 1956], No. 28384/56. Class 83 (3). An apparatus for simultaneously generating two or more elongated arcuate surfaces 36, varying in depth, on a workpiece 30, comprises a head means 246 for rotatably-supporting two or more tools 382, means 210, 212, for relatively shifting the head means and a work-holder 80 to and from working positions, and means for simultaneously relatively arcuately and axially feeding the head means and the work-holder. The workpiece illustrated is the disc 30, Figs. 16 and 19, of a braking device. Two such discs 30, 32, are separated by balls 38, so that when a pivot 52, attached by links 48, 50, to the discs, is pulled outwardly, the balls ride up the cam surfaces 56, 54, forcing the discs further apart to operate the brake. The workpiece 30 is gripped by three jaws actuated through a drawbar 96 by the fluid-pressure means 104. The chuck 80 is secured to a spindle 78 by screws 98 and a driving-dog 100. The workpiece is supported between the jaws by pads 92. The spindle 78 carries a face-cam 112 co-operating with face-cam 110 on the machine frame. A spindle-rocking fluid-pressure means, having one end universally-mounted on the frame, has its piston-rod universally-attached to a crankarm 114 on the spindle 78, so that, as the piston is advanced, the cams 110, 112 cause the chuck to rotate and move axially. Upper surfaces 200 on the cam 112 are engaged by fixed pins 204 to hold the cams in engagement. The cutter head 246 is fed downwardly against springs 270, 272 by the pistons 210, 212. An electric motor 374 carries a gear on its shaft driving radiallyopposite gears on shafts carrying further radially-opposite gears engaging a central gear on a stub-shaft, which at its lower end carries a gear engaged by gears on each of the cutterspindles 376, 378, 380. Fluid pressure for the chuck-actuating means 104 is provided by a pump driven by an electric motor. A similar pump and motor provide pressure for the cutter-feeding pistons 210, 212 and the spindlerocking means. Operation.-In operation, three switches are operated to start the pump motors and the spindle motor, and a further switch is operated to open the chuck jaws. A workpiece is placed in position, and a switch actuated to operate a solenoid-controlled valve, causing downward movement of the cutter head. As the cutter head descends, a cam thereon actuates a switch, causing closing of the chuck jaws. Gauging-devices.-Just before the head is stopped at the correct cutting-depth by collars 266, 268, a further cam on the head actuates a switch to start the chuck movement. When cutting is complete, a projection on the chuck actuates a switch, which causes the parts to return to their initial positions. Lubricating machines.-On each down-stroke of the head 246, a rod 334 operates a piston-type pump which forces oil up a passageway 348 into passages 352, 358 leading to the spindle bearings 74, 76. Oil from the bearing 76 drains into a passage 366, whence it is passed to the cam 112 to maintain an oil film on the cam surfaces. Furthermore, a bevel-gear on the shaft 380 rotates a gear-type pump which forces oil upwardly from a reservoir surrounding the lower bearings of the spindles, to lubricate the spindle drive. Specification 583,108 is referred to.