Patent GB-263798-A (GB)
Title: Improvements in or relating to machines for producing curved tooth gears
IPC: B23F9/10
Filed: 1926-12-20
Abstract: 263,798. Gleason Works, (Assignees of Wildhaber, E.). Dec. 23, 1925, [Convention date]. Gear - cutting; mailling - cutters. - In a machine for cutting tapered gears with longitudinally curved teeth, a tool is moved in a curved path across the face of the blank which is rotated while at the same time the blank and tool are moved relatively about an axis offset from the blank axis to generate the tooth profiles. The blank is indexed between successive cutting operations. The tool housing 12 is mounted in a cradle 11 and the blank B is carried or. a spindle 14 in the frame 13. The tool T consists of a rotary face mill having blades of circular profile, but other curved profiles or straight sided blades may be employed. The tool-housing is mounted on a standard 18 having a foot supported by a slide 20 which is laterally adjustable in the cradle 11 by rack and pinion gearing 22, 23 in order to cut gears of different face widths. The tool may also be adjusted about two perpendicular axes and also vertically so that the same tool may be used to cut gears of various root angles, dedendum angles and spiral angles. One of the angular adjustments is performed about the axis of a stud 27 on the plate 19 by means of a shaft 28 and worm gearing 29, 30. A scale 31 may be employed to facilitate this adjustment. The standard 18 carries a vertical slide 33 adjustable by a screw 36 to position the tool according to the spiral angle to be cut. This slide carries a plate 38 which, in order to obtain the second angular adjustment of the tool, may be moved around a stud 39 by worm gearing from.a shaft 40. The housing 12 is adjustable on the plate 38 in the direction of the axis of the cutter spindle in order to take up wear. This adjustment is made by means of a shaft 48 and gearing 49. The axes of the studs 27 and 39 preferably intersect each other at right angles at a point on the axis of the tool spindle. A scale 54 is provided for setting the plate 38. In order to drive the tool in any adjusted position, a motor 60 is built into the housing 12 and is connected through bevel gearing 61, shaft 64, spur gearing 65, shaft 67, bevel gears 68, shaft 69 and pinion 70 to an internal gear on the tool head. During cutting, the blank and the tool cradle 11 are synchronously rotated to generate the tooth profiles. The blank spindle 14 is mounted in a guide 72 vertically adjustable on an upright 73 integral with the blank head 74 which is laterally adjustable on the frame 13 by hand-operated rack gearing. The frame 13 is angularly adjustable about a vertical axis Y to adjust the blank in the desired cutting plane, this adjustment being effected through a pinion and circular rack 84, the rack being oscillated by means of a cam 88 in order to withdraw the blank periodically from the tool to permit indexing. The vertical adjustment of the member 72 serves to offset the blank axis from the cradle axis so that hypoid gears may be generated as well as ordinary bevels. A graduated dial 101 on a shaft 98 is provided for this adjustment. The generating motions are derived from a mainshaft 105 through gearing shown diagrammatically in Fig. 11. A gear train from the shaft 105 including change gears 113 drives a shaft 114 which through reversing gearing 117, 119, spur gearing 123, shaft 124, and bevel gearing 146 actuates the cradle-driving worm 148. Further gearing from the shaft 124 including change gears 128, differential gear 130, and gearing 131 - - 143 drives a worm wheel 144 on the blank spindle. Telescopic shafts 137 and 140 are incorporated in this gearing to permit the adjustments of the blank. The cam 88 is rotated continuously to withdraw the blank for indexing by gearing 150 - - 153 from the shaft 114. Indexing is effected by gearing from the shaft 114 including an intermittent locking-mechanism 164 which periodically imparts motion to the casing of the differential 130 to superpose the indexing movement on the blank rotation. The release of the indexing shaft 159 may be effected through a pawl 165 actuated by a cam 166 on the shaft 89. Instead of a rotary face mill a planing tool may be employed.