Patent GB-825469-A (GB)
Title: Improvements relating to machines for running together pairs of gears, for lapping or burnishing them or for like operations
IPC: B23F19/04
Filed: 1958-03-06
Abstract: 825,469. Lapping gears. GLEASON WORKS. March 6, 1958 [March 6, 1957], No. 7294/58. Class 60.  A machine for running together pairs of gears P, G, Fig. 1, for lapping, burnishing or like operations comprises two spindles 12, 14 for supporting the gears, a motor 34 for driving at least one of the spindles, a mechanism alternately driven in opposite directions by a reversing motor 25, Fig. 2, for effecting a cyclical relative motion between the spindles to thereby change the positional relationship between the gears as they run together, at least one of the motors being of the variable speed type, and means operating in time with the relative motion between the spindles to vary the speed of the variable speed motor. The machine is similar to that described in Specification 712,670 for running together pairs of bevel or hypoid gears and consists of the spindle 12, Fig. 1, mounted in a housing 11 laterally movable on a base 10 by a handwheel 15 and the spindle 14 mounted in a housing (not shown) which is movable laterally and longitudinally on a head 13 vertically movable on a column 16, the column being adjustable in the direction of the axis of the spindle 12 by a handwheel 17. A bracket 18, Fig. 2, is vertically adjustable on the column 16 by means of a screw 19 and has journalled therein a shaft 21 which is rotatable by reduction gearing 26 ... 33 from the variable speed, reversible, D.C. motor 25 and has a cam 22 having oppositely directed spirals cooperating with followers 23 on the head 13. The spindle 14 can thus be vertically moved by movement of the bracket or by the oscillation of the cam 22, the latter also being associated with a linkage, such as described in Specification 712,670, to move the spindle laterally and longitudinally. The relative motion between the spindles shifts the area of contact between the teeth of the gears from the posi. tion 24, shown shaded in Fig. 6, to either of the positions 24<SP>1</SP>, 24<SP>11</SP>. The shaft 21, Fig. 2, is connected by gearing 33, 51 to a shaft 49 having adjustably mounted cams 48, 48<SP>1</SP> which cooperate with followers 47, Fig. 3, attached to racks engaging the pinions 39 of autotransformers 36, 36<SP>1</SP> connected in the alternating current side of the rectifier supplying the motor 25 and arranged so that in one direction of the motor 34, which is of either the constant-speed or variable-speed type and belt-drives at least one of the spindles 12, 14, the speed of the motor 25 is controlled by one autotransformer, and in the opposite direction by the other autotransformer ; the pinions 39 are connected by clutches 42<SP>1</SP> to the shafts of the autotransformers and can be set to predetermined positions by means of calibrated rims 43 and index marks 44. In operation, the motor 34 is first run in one direction and the speed of the motor 25 varied, and hence the vertical, lateral and longitudinal movements imparted to the spindle 14 from the cam 22 and linkage varied, by one of the autotransformers which is controlled by the shape of its associated cam driven from the motor 25; the shape of the cam may be such that the motor 25 runs fast when the gears are in contact at the position 24 and slow at the positions 24<SP>1</SP>, 24<SP>11</SP>, so that more lapping occurs at the latter positions than the former. After a desired number of oscillations of the cam 22, the motor 34 is reversed to run together the other faces of the gears G, P and the speed of the motor 25 varied by the other autotransformer and cam. The cams 48, 48<SP>1</SP> are adjustable relative to each other and to the shaft 49 and may be changed for other pairs of cams to suit gears of different lapping characteristics or design. The motor 34 may be the variable speed motor, the motor 25 then running at constant speed. The electric circuits controlling the motors may be as described in Specification 712,670.