Patent GB-1357478-A (GB)
Title: Wave wound coil-making apparatus
IPC: H02K15/085
Filed: 1972-04-27
Abstract: 1357478 Making wave-wound coils RO-BAND CORP 27 April 1972 [19 May 1971] 19733/72 Heading B3A Apparatus for winding wire in wave form into slots 21 of a circular core 20, e.g. a stator for alternators, motors or generators, comprises a core supporting means 28, Fig. 12, a rotatably indexible wire feeding head 57 mounted for reciprocable movement axially of the core, wire laying needles 61 radially adjustably mounted in the periphery of the head for movement from a position in which wire is laid close to the bases of the core slots to positions progressively nearer the core centre, guiding fingers 33, 33<SP>1</SP> radially adjustably mounted on the core-supporting means to enable progressive winding of the wire, and retaining means 36, 36<SP>1</SP>, 37, 37<SP>1</SP> supported for movement toward and away from each end of the core-supporting means and having a circle of holding elements (70), Figs. 8, 9 (not shown), positioned to engage looped ends of wire windings and thus maintaining the windings towards the core slot bases. The core-supporting means 28 is mounted on a cradle 27 on a machine base 26. Tooling rings 31, 31<SP>1</SP>, which are slidably mounted on rods 30 passing through the cradle, have a plurality of slots 32, 32<SP>1</SP> for receiving fingers 33, 33<SP>1</SP> which are bent to form L-shaped portions 34, 34<SP>1</SP>. Recesses 43, 43<SP>1</SP>, 44, 44<SP>1</SP> allow clearance of the respective fingers. The head 57 is mounted on a tubular spindle 45 supported in a bearing 46 and carries an indexing disc 48 with notches 49 which engage with an indexing key 50. The wire is supplied from spools 51 mounted on a turntable 52 which is driven in sequence with the head to compensate for rotation of the head and to prevent wire twisting. The wire is passed through a fitting 56, spindle 45, and thence through openings 60 into radially adjustable needles 61. A ring portion 59 clamps the needles in a predetermined position of adjustment during wire winding sequences. Operation.-The core is inserted in the support so that the fingers are opposite lands 35, Fig. 7, between the slots. The needles 61 are adjusted to their maximum outwardly-extending position by placing a pin (69), Figure 13 (not shown), in hole 63 and the wires 53-55 are then threaded through bore 58 of the head to each needle and anchored to pins 33<SP>1</SP>. The head is indexed clockwise to a selected position and moved through the core, Fig. 4 (not shown), pulling the wires through three alternate slots, Fig. 3 (not shown). The spindle 45 then indexes to enable each wire to pass over hook portions 34, Fig. 5 (not shown) and then the head is drawn back through the core and indexed again in the same direction as before and the loop of each wire is passed over hooks 34<SP>1</SP> as the head passes back through the core. This procedure continues until a sequence of a plurality of turns is wound, each turn corresponding to a complete revolution of the head 57. Hooked portions 34, 34<SP>1</SP> can be adjusted to give room for a further winding sequence on top of the first plurality of turns and the retainer rings are also adjusted so that holding elements (70) engage the loop ends of the first sequence to hold it closely to the slot bases. Further winding may then be carried out with the apparatus adjusted accordingly after which the finished core, Fig. 11 (not shown), is removed from the support. The apparatus may be power driven and the winding sequences may be programmed for automatic operation according to the particular core being wound.