Patent GB-191228232-A (GB)
Title: Improvements in or relating to a Machine for the Automatic Manufacture of Wheels with Helical or Compound Helical Teeth.
Inventor: BOULT ALFRED JULIUS
IPC: B23F1/06
Filed: 1912-12-06
Granted: 1913-10-23
Abstract: 28,232. Boult, A. J., [Maschinenfabrik Lorenz]. Dec. 6. G e a r - c u t t i n g.- A machine primarily intended for cutting double helical wheels by the use of formed end mills is arranged for complete automatic actuation. Separate change gears control the angle of the teeth and the number of the teeth. A pulley or electromotor F, Fig. 1, drives a shaft 5 at a constant high speed and a shaft G<1> through a change-speed gear I. The cutter spindle 1 is driven from the shaft G<1> and is geared to a shaft 4, Fig. 3. Axial movement of the cutter spindle is obtained from the shaft 6 and lateral from the shaft 14 through a reversing gear 12. Clutches 15, 17 connect the shafts 6 and 14 to the shaft 4 for feeds and clutches 16, 18 to sleeves loose on the shafts and driven at 5<e> from the shaft 5, for idle movements. The gear 12 permits the rapid movement to be employed for feeding when required. The clutches are controlled by an escapement device, Fig. 4, driven, when permitted, by a slipping coupling and gearing from the wheel 34<a>, Fig. 3. Stops 33<1> ... 33<4> are staggered to engage consecutively an abutment 36 when the abutment is in different lateral positions. Cam grooves 31 and levers 27 are arranged so that one clutch only is driving at any one time. S t o p s 52, 52<1>, Fig. 8, for the lateral and 53, 54 for the axial movements of the cutter spindle actuate racks 50, 48 geared together and to the rack 41, which carries the abutment 36. The arrangement is such that the cutter spindle is (1) fed into the wheel blank according to the depth of tooth, (2) traversed to cut out a tooth space, (3) withdrawn clear of the blank, (4) returned across the blank to the original position. The completion of each movement releases the escapement to effect the clutch operation for the next movement. During the lateral movements of the cutter spindle, the wheel blank is rotated by the head D, Fig. 1. The motion is derived from the driven side of the gear 12, Fig. 3, and is transmitted by the shaft 5<a> and gearing 72, 76, Fig. 9, to a reversing gear 55 loose on the shaft 56 but driving it through the change-gear train 59 which controls the angle of the teeth. Drive is taken from the shaft 5 through gearing 5<y>, 79, 81, 83, Fig. 9<a>, and clutch 84 for indexing purposes, and this motion as well as that from the shaft 56 are conveyed to the head D through differential gearing 69, change gearing 62, and a worm drive 63<1>, Fig. 1. The clutch 84 is actuated to effect the indexing during movement (4) of the cutter spindle, and is engaged by a spring when permitted by a lever 84<11> operated in connexion with two other levers (not shown), which engage recesses in the disk 70<Î>, to lock the wheel 70 when the clutch 84 is open. The control mechanism for the levers is such that after four turns of the wheel 70, one of the two other levers is allowed to spring home, permitting the lever 84<11> to return and, by means of a cam, disengage the clutch 84. The third lever then springs home and locks the wheel 70. If the reversing gear 55 is rendered inoperative, the machine can be employed for milling spur-wheels with teeth on one side of the central plane staggered by half the pitch with respect to those on the other side.