| 摘要 |
1,126,472. Gear-cutting. CENTRE ELECTRONIQUE HORLOGER S.A. 10 Jan., 1966 [26 Jan., 1965], No. 1043/66. Headings B3B and B3L. [Also in Divisions H1 and H2] A machine for cutting toothed wheels 9 for watches, etc., comprises tool 60 moved in its cutting and feed movements by an electromechanical oscillator. The oscillator comprises a tuning-fork 2 carrying the tool on its limb 2c, the other limb serving to balance the system. Two permanent magnet systems 5a, 6a and 5b, 6b co-operate with the single copper-plate secondary windings 7, 8 of transformers 24, 25. The primary transformer windings 24b, 25b are connected to amplifiers 21, 23 connected to a pick-up coil 18 co-operating with a bar on the limb 2b. A de-phasing circuit 22 maintains the output of the amplifiers 90‹ out-of-phase with each other. The amplifier 21 has a direct voltage supply but the amplifier has a variable supply from a cutting control circuit 30. The limbs 2a, 2b oscillate in balanced elliptical orbits. The wheel to be cut is mounted on a rod 10 carrying an indexing wheel 11 co-operating with an electro-magnetically operated indexing plunger 12. The indexing device 11, 12 is actuated by the discharge of a capacitor 27 after a build-up of the feed voltage of amplifier 23 has caused the tool to feed to full depth. Upward indexing movement of the plunger 12 is dampled by a dashpot plunger 46 and the indexing wheel 11 is braked by a spring 49. Grooves 2c, 2d filed in the arms of the fork assist in preventing unwanted natural vibrations during indexing. The shaft 10 is deformed to hold the work 9 steady by balls 63, 64 on an adjustable bar 16 engaged by a pressure screw 50. The wheel is held in a recess 52, 55, Fig. 5, in the rod by a leaf spring 53. The diamond tool 60 is glued to a block 65. |
