Patent GB-345742-A (GB)
Title: Improvements in or relating to gear cutting machines
IPC: B23F1/06
Filed: 1930-01-27
Abstract: 345,742. Gear-cutting. GLEASON WORKS, 1000, University Avenue, Rochester, New York, U.S.A.-(Assignees of Hill, M. H. ; 1000, University Avenue, Rochester, New York, U.S.A.) Jan. 27, 1930, No. 2S31. Convention date, Sept. 19, 1929. [Class 83 (iii).] In a gear-cutting machine in which the work and the tool mechanism are separated for indexing the blank between successive cutting operations, a cam-actuated lever by which the withdrawal movement is effected is pivoted to a slidable member which may be moved in order to separate the work and tool a considerable distance to facilitate loading operations. The base 20 carries a slide 22 on which is mounted a plate 23 forming the foot of a column 24. The slide and plate are adjustable in perpendicular directions, a dial indicator being provided for the plate adjustment. A second plate 25 is vertically adjustable on the column by means of a screw 30 fitted with a micrometer head 31 and is secured by bolts 27 and screws. The plate 25 carries a saddle 35 which is angularly adjustable by means of screws 36 in order that a single rotary face-mill 40 having integral cutters may be adapted to cut different gears. The cutter spindle 41, Fig. 4, is mounted in ball bearings and is provided with a seal 46 to exclude chippings &c. An electric motor 50 mounted on the saddle drives the cutterspindle through a coupling 52, spindle 51, change gears 53, 54, shaft 55 and bevel gearing 56, the angular adjustment of the saddle being about the axis of the shaft 55. The change-gears are mounted in a housing 61 having a hinged cover 62. The spindle carrying the blank G is mounted in a head 72 which is axially adjustable on a carrier 71 angularly adjustable on a cradle 70 which oscillates in a guide 21 carried by the machine base. The work-spindle is connected to a segment arm 78 which rolls on a crown gear segment 79 to give generating movement to the blank. The indexing mechanism may be as described in Specification 339,852, [Class 83 (iii), Metals, cutting]. During the rolling movement the slide 22 is fed progressively to feed the tool to the required depth and is then withdrawn while the blank is indexed. The oscillation of the cradle is effected bv a link 94 actuated by an adjustable crank-pin on a crank shaft 85 which is driven from a motor 115 through gears 116, feed change gears 119 .. 122, shaft 123, and worm gearing 124. The shaft 85 also carries the feed cam 86, Fig. 6, which acts through a lever 103 attached to a block 106 adjustably secured to the slide 22. In order to produce an extended withdrawal of the tool for removing a finished blank the pivot 102 of the lever 103 is secured to a slide 101 which is shifted by a crank arm 133 carried by a shaft 131 which may be rocked by a hand lever 132. The shaft 131 works in an eccentric bushing which may be adjusted to take up'wear in the withdrawal mechanism. To adjust the cutter axially or after sharpening, a setting-gauge comprising a forked bar 155, Fig. 11, and contact member 156 is provided, the contact being adjusted to engage the tip of a cutter blade and being set by means of a graduated head 165. The cutter is adjusted to the gauge by means of a screw 108 operating the slide 22. In order to check the cutter-spindle after stopping the machine, the coupling 52 of the shaft 51 is braked by means of a pair of shoes 170, Fig. 8, attached respectively to a spindle 177 and a sleeve 175 which are operated by means of a lever 172 having cam portions 173, 174 engaging flanges 277, 275 mounted on the spindle and sleeve respectively. Extra change gears for the machine are mounted within the machine base which is fitted with a hinged door 181, Fig. 12, having an extension 182 provided with a rib fitted with rods 185 on which the spare gears are carried. The door is substantially balanced about the hinge 187 and its movement is limited by a flange 188 and by the outer end of the extension 182. The machine is automatically stopped on completion of a gear by means of stop mechanism which is actuated once for each revolution of the feed shaft 85 (corresponding to the cutting of a single tooth) by means of a cam. When the required number of teeth have been cut the stop mechanism is tripped to break the motor circuits and stop the machine.