Patent GB-190506845-A (GB)
Title: Improvements in or relating to Gear Cutting or Generating Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1905-03-31
Granted: 1905-12-21
Abstract: 6845. Boult, A. J., [Gleason, J. E.]. March 31. Planing and shaping; dividing-apparatus.-An automatic machine for planing or generating the teeth of bevel-wheels is shown in the Figures, the blank X being mounted on the spindle 86 of a headstock 3, which is adjustable by means of a screw 80 towards and away from the centre of the cutter-carrying parts 5, 10. The main shaft 21 drives a worm-wheel or casing 125 by means of a worm 126 and bevel-wheels 130, 135, 141, a crankdisk 173 by means of a chain 179, spur-wheels 181, 182, bevel gearing, and a shaft 25 in the centre of the part 5, and a cam 53 by means of gearing 38, 37, a shaft 35<a>, worm-wheel 34, and worm, pinions 31, 30, a shaft 28, and bevel-wheels 27, 24, 23. The parts 5, 10 are moved about the centre of the part 5, to suit the conicity of the blank, by means of a ratchet lever, pinion, and rack 12, and the part 5 is oscillated relatively to the part 10, to feed. the cutters into the blank, by the cam 53, a groove 68 in which engages a pin 69, Fig. 23, on a lever 70 having an adjustable block 73 working in a slotted arm 72 secured to the part 5. The substantially straight-edged tools 205, Figs. 19, 22, and 25, are held between compressible jaws 202 let into the clamping-bolts 199 of blocks 195, 195<a>, which are reciprocated, by the variable-throw crank 173 and the rods 176, in guides 191,192, which are pivoted at 189, 190, Fig. 18, and adjusted in inclination to each other by a right and left handed nut 194, Fig. 22, the lines of motion of the tools always passing through the intersection of the shafts 187, 25, 86. The ends of the guides 191, 192 are locked to a bracket 193 having a projection 206 engaging a horizontal groove in a block 207, which also has a projection 209 engaging a groove 210 in the curved lever 167. This lever is pivoted at 168, Fig. 2, in alinement with the shaft 86, and also on a sleeve 156 on the shaft, and has a divided end and slots to receive blocks 164 mounted on trunnions 163 on a vertically movable rack 160 gearing with a segmental rack on the sleeve 156, which is splined on the sleeve 84 enclosing the spindle 86. The plate 87 carrying the dividing-mechanism forms part of the sleeve 84, the worm 126 being in alinement with the spindle 86, so that the worm and worm-wheel 126, 125 are always in gear. When the tools have been fed to the required depth, a ring on the cam 53 retracts the locking- pin 51, Fig. 10, from a stop 43, Fig. 22, on the crank-arm 42, and simultaneously conneets the arm to the shaft 35<a> by means of the clutch 47, 49, the arm being then rotated once, and, by means of the adjustable crank-pin 45 and the connecting-rod 46, first to lower the block 207, then to raise it to the same extent, and finally to return it to its original position. This action causes the lines of motion of the tools 205 to oscillate about the shaft 187 and the blank about its axis simulcaneously and uniformly, so as to generate the profiles of the teeth as indicated in Fig. 25. The cam 53 then withdraws the tools, and a projection 55 on the bevel-wheel 38 on the same shaft as the cam 53 moves the rod 57, rotates the ratchet-wheel 60 and pinion 62, and moves the segmental rack 63, thus turning the shaft 66. The turning of the shaft 66 Fig. 8, raises a lever 150 and a locking-pin 144, and, by means of a lever 146, lowers the locking- pin 116. Since the wheel 143 is now locked, the bevel pinion 118 mounted in the continuouslyrotating casing 125 rolls on the wheel 124 and rotates the wheel 117, the wheel 109, the changewheels 108, and a pinion 99 clutched on the shaft of the worm which gears with the worm-wheel 88 on the work spindle 86. The blank is rotated until the wheels 117, 109, and the single-notched plate 114, Fig. 5, have made one revolution, when a spring attached to the lever 146 pushes the pin 116 into the notch 115 in the plate 114, and withdraws the pin 144. When the pin 116 engages the notch 115, a pin 111 on a spring-pulled lever 112 is in contact with an incline on the periphery of a cam 110 on the same shaft as the plate 114, thus tending to rotate the latter and to keep one end of the notch 115 against the stop 116. The pin 107 carrying the change-wheels 108 is adjustable in a radial slot in a plate 106, which is angularly adjustable about the shaft 102.