Patent GB-778290-A (GB)
Title: Improvements relating to machines for testing or forming gears
IPC: B23F19/04
Filed: 1954-07-22
Abstract: 778,290. Lapping or burnishing gears. GLEASON WORKS. July 22, 1954 [Aug. 3, 1953], No. 21429/54. Class 60 [Also in Groups XIX and XXXVII] A machine, for running gears P, G, Fig. 3, together for lapping or burnishing them, comprises a frame 20, drive and driven spindles 24, 25 for the gears, upper and lower motor supports 134, 135, Fig. 1, pivoted to the frame 20, a connector 141 pivoted to each support to form therewith a parallelogram assembly, a motor driven shaft 123 or 129; Fig. 2, journalled on each support, aligned pulleys 124, 131 on the shafts and an endless drive belt 132 connecting them, aligned pulleys 125, 99 on the shaft 123 and the spindle 24 and a second belt 126 connecting them, and means 142, 146 and 148 for raising and lowering the supports to declutch and clutch the belt 126. The motor 117 is a low-speed motor connected through reduction gearing 121 and an electromagnetic clutch 122 to the shaft 123 while the motor 118 is a high-speed motor connected through an electromagnetic clutch 128 to the shaft 129, the pulleys 124, 131 being stepped so that a range of speeds for the drive spindle 24 may be obtained from the motor 118. The means to clutch and declutch the belt 126 includes an eccentric 146 operated by a handle 148 and connected to the support 134 by a turnbuckle 142, which enables the tension of the belt 126 to be adjusted. A second turnbuckle. to adjust the belt 132, is provided in the connector 141. The drive spindle 24 is journalled in a bracket 22 pivotally connected to the frame 20 by anti-friction bearings which are pre-loaded by their cover plates 52, Fig. 6. An extended part 53 of the bracket may be engaged by either of two spring-loaded plungers 54 and the pressure applied by the plunger may be adjusted by a calibrated screw 56. When the gears are run together, any errors of eccentricity, tooth spacing or tooth shape cause a pivotal movement of the bracket 22 which is indicated by a gauge 66 and recorded by an electromagnetic transducer 71 comprising a variable differential transformer connected to. a record unit (not shown). The spindle 24 may be turned by hand to feel irregularities in the gears when the belt 126 is declutched. To enable the gears to be run together on fixed axes, the part 53 is clamped in' a central position by a pair of members 57, 58 which also engage an aligning part 59 on the frame, the members being operated against the pressure of springs 61 by a hand-operated eccentric 62 to which they are connected by an axially displaceable rod and tube 64, 65. The spindle 25 for the driven gear is mounted on a column 27 adjustable along a way 28 upon a sliding base 29 adjustable along a way 31 on the upper surface of the frame 20. Springs (not shown) hold the sliding base 29 in contact with the frame and means are provided to clamp both the base and the column. The driven gear is adjustably braked by an electric generator 149 connected to an ammeter and a rheostat. An over voltage relay switches off the driving motors, each of which is connected to the supply through a forward and reverse controller, if the speed of the generator is excessive due to the belts not being properly adjusted. The clutches are operated automatically with the motors from a rectifier in the electric circuit of the machine and the clutch 122 is partially energized whenever the high-speed motor 118 isswitched off so that the low-speed motor 117 acts as a brake. The spindle 24, 25, Fig. 5, are mounted in bearings 74, 75 preloaded by relative rotation between threaded sleeves 77, 79 one of which has teeth 82 for engagement with an adjustment mechanism (not shown). The gear P or G is held against an arbor 84 by a draw pin 85 gripped by a collet 87 which is contracted by a tapered bore 83 when it is displaced to the left by a draw rod 88 and springs 92. To dechuck the gear, a lever 93 is turned to screw a part 108 on to a part 107 until the latter, moving against the resistance of a light spring 114, abuts an external flange on the hollow drive pulley 99 for the spindle 24 or 25. Continued turning of the lever 93 causes a pin 105 and the draw rod 88 to move the collet 87 to the right and thus release the pin 105. The length of the draw rod 88 and the compression of the springs 92 maybe adjusted. An alternative collet-actuating mechanism is shown in Fig. 13 in which the draw rod 209 is displaced axially by a nut 213 threaded on to the spindle 202 which is held against rotation by a locking pin 206. The nut 213 abuts a nut 211 locked to the draw rod by a nut 212 and is rotated by a knob 217 and a spring- loaded saw-tooth clutch 214 which prevents excessive tightening of the collet. To treat hypoid or bevel gears the driven spindle 25 is mounted on a slide vertically adjustable on a horizontally adjustable slide which may be angularly adjusted about a vertical axis and clamped to the upper surface of the frame 20. Specification 778,291 [Group .XXII] is referred to.