Patent GB-398098-A (GB)
Title: Improved machine for producing gears
IPC: B23F9/10
Filed: 1933-02-16
Abstract: 398,098. Gear-cutting. GLEASON WORKS, 1000, University Avenue, Rochester, New York, U.S.A. Feb. 16, 1933, No. 4831. Convention date, Feb. 27, 1932. [Class 83 (iii).] In a gear-cutting machine for producing bevel and hypoid gears with a rotary annular cutting-tool the tool is mounted on a cradle which is adjustable through 360‹ and the cutter is adjustable angularly on the cradle about an axis intersecting the cradle axis. The cradle housing consists of a lower part 21 secured to the frame and a separate upper part 22 secured by screws 23. The cradle 27 oscillates in front and rear bearings 25, 26 in the housing and is secured against axial movement by a gib 28. The front face of the cradle has guides for a radially-adjustable slide 33, adjustment being indicated on a scale 48 and being effected from a stub shaft 40 through worm gearing 41, pinion 42, and rack 45 on the cradle. A carrier 50 is rotatably adjustable in a circular opening in the slide 33, this adjustment being effected from a shaft 56 through gearing 57 and internal gear 60. The carrier 50 is of ring form and has a depending bracket portion 68. An angularly-adjustable swivel head is mounted in the central opening of the ring and has a bearing portion 66 seating in the bracket 68 so that the swivel head may be angularly adjusted about the axis of a shaft 69 mounted on ball bearings in the parts 66, 68. This adjustment is indicated on a scale and is effected by rotation of a stub shaft 75, connected by bevel gearing 80 and worm gearing 83 to a segment 85 on the carrier. The cutterspindle 92 is mounted on ball bearings 97, 98 in a slidable member 94 which is adjustable in the swivel head axially of the cutter spindle. The cutter which is of usual face mill construction is secured to its spindle by bolts 113. Axial adjustment of the cutter to compensate for the reduction in blade height caused by sharpening is effected by a screw. The member 94 is held in adjusted position by a bolt 120 passing through a straight slot 121 and having its head located in an arcuate slot 122. The cutter is driven from a motor 125 through bevel gearing 127, gearing 132, shaft 134 coaxial with the cradle, bevel gearing 141, splined shaft 147, bevel gearing 154, 160, shaft 69 and bevel gearing 172. A spline slot 175 and key 174 permit the axial adjustment of the cutter. The sliding base 185 moves in the direction of the cradle axis as in Specification 279,405, [Class 83 (iii), Metals, Cutting], and is controlled by a cam 210. The carrier 188, angularly adjustable on the base in accordance with the blank cone angle, carries a column 192 adjustable axially of the work spindle to set the blank to the required cone distance, and the work-head is vertically adjustable on the column for offsetting a hypoid gear blank and carries a work spindle 205. In operation, the sliding base is fed to depth and cradle and blank are rotated in timed relation for the generating roll. The blank is then withdrawn and indexed. The cradle may, if necessary, be adjusted on its axis by hand operation of the cradle drive shaft 380, a pointer 387 moving over a scale to indicate the setting.