Patent ES-281759-A1 (ES)
Title: Winding head for motor armatures
IPC: H02K15/09
Filed: 1962-10-22
Abstract: A machine for winding armatures with series arranged coils and loops of wire between the coils comprises a variable-speed winding head, means for rotatably supporting an armature with its spindle at rightangles to the winding head shaft, locking means for the armature, means on the winding head for unlocking and rotating the armature while the head is running at a slow speed, a hook operable during the rotation of the armature to grip the wire and form a loop therein, the hook being movable along and rotatable about an axis which crosses the centre-line of the armature spindle, the axial movement of the hook being controlled by the means which cause rotation of the rotor, and the rotary movement of the hook which twists the loop being produced by means controlled by the variations in speed of the winding head. The winding head comprises a housing 1 fitted with a collet 2 by which it can be attached to the shaft of a coil-winding machine. A sleeve 7 which carries a cam follower 8 slides on the housing, and also carries a pin 6 which runs in a radial groove 5 in the housing. An intermediate ring 10 and an upper part 11 are connected to the housing by screws 9. The pin 6 passes through an adjustable nut 13 on a shaft 14 which carries a channel member 15. Mounted in the channel are a pawl 19 loaded by a spring 25 and a pawl 16 connected to the pawl 19 by a spring 22a. The rest positions of the pawls are adjusted by screws 18 and 21. An armature to be wound is shown at 23 and is locked against rotation by lugs 24 on the channel 15, which also carries a rack 27. The shaft 14 slides in a sleeve 30 and rotatable about this sleeve is a member 31 with pinion teeth 32 at one end and a gear-wheel 33 formed at the other end. The pinion 32 meshes with two wheels 34 mounted on pins 35 and unsymmetrically weighted by lead pieces. The wheels 34 are biased by springs 38 to rotate in one direction against adjustable stops. The wheel 33 meshes with a pinion 40, Fig. 3, integral with a wheel 42 which drives a toothed sleeve 72, which has keyed to it a shaft 43. At the upper end of the shaft 43 is a hook 44 and an intermediate portion of the shaft has annular teeth 45 thereon so that it forms a cylindrical rack. A wheel 51 meshes with this rack and is secured to a wheel 49 which meshes with a wheel 47 which in turn engages the rack 27. The upper part 11 of the head carries a shaft 53 bearing a hub 54 from which radiates spokes 54a. The number of spokes is one less than the number of poles of the armature to be wound which is mounted on pins 63 and 64. The hub 54 has upper ratchet teeth 56 which co-operate with teeth on a fixed member 55 mounted on the shaft 53, and lower ratchet teeth 57 which co-operate with teeth on a freely rotatable member 58. The member 58 has a projecting pin 59 carrying a weight 60, and is acted on by a compression spring 61 which also urges the pin 59 against a stop-pin 62. Operation.-An armature is placed between the pins 63 and 64, the leading end of the wire 79 is attached to it and the machine started so that the head rotates at high speed which causes the wheels 34 to be rotated by the weights 36 against the springs 38. The weight 60 also swings out but the fixed member 55 prevents rotation of the hub 54. When the first winding is completed the speed of the winding head is considerably reduced and simultaneously a cam engages the follower 8 and moves the sleeve 7 downwards, carrying the shaft 14 with it and hence the pawls 16 and 19, so that a catch on the pawl 19 rotates the armature through 30 degrees. The rack 27 is also lowered and through the wheels 47, 49, 51 and 45 raises the shaft 43, so that the hook 44 is moved up to grip the wire 79. The cam follower 8 is now raised to its initial position which raises the shaft 14 and causes the pawl 16 to rotate the armature through a further 30 degrees. At the same time the hook 44 is lowered and draws the wire into a loop. The speed of the winding head is increased and the weights 36 swing outwards thereby rotating the wheels 34 and hence the shaft 43 so that the loop of wire is twisted and lies in a sector between two of the spokes 54a. When the speed of the winding-head is next reduced the shaft 43 rotates in the opposite direction, the loop of wire is deflected by the rotation of the spoked hub 54 and detached from the hook, and due to centrifugal force extends in the direction of the rotor shaft and is caught by a lug 71.