Patent GB-190322443-A (GB)
Title: An Improved Apparatus for Winding Inductive, and Noninductive Coils
Inventor: WILSON WILLIAM HAMILTON
Filed: 1903-10-17
Granted: 1904-10-06
Abstract: 22,443. Wilson, W. H. Oct. 17. Wire; bending.-Relates to a method of, and apparatus for, winding inductive and non-inductive coils which are built up of a continuous series of flat helices set face to face, the wire being wound firstly from within outwards and then virtually from the outside inwards. Two annular discs a, b, Fig. 1, mounted on the mandrel c of a lathe, are spaced apart by a small ring of insulating-material fixed by pins p to the disc b, which is formed with a split sleeve d provided with a strap e and clamp. ing-screw f. The reel l holding the wire k is first placed on a pin situated at a suitable distance from the apparatus, (shown in dotted lines), and, after securing the free end of the wire to the insulating-ring, the mandrel c is rotated until the space between the two discs is filled by the first helix, whereupon an equal length of wire for the second helix is wound (in the same direction for an inductive, or in the opposite direction for a non- inductive, coil) upon a conical drum g integral with or mounted upon the mandrel. A speedcounter q serves to indicate the length of wire on the drum g. The disc b is next removed, the reel l is threaded through it and thrust on a pin m thereon having a catch-spring n, and the disc is replaced, leaving sufficient room for the second helix and with the wire k passing out through a slot at its inner circumference. The mandrel is again rotated (in the opposite direction for an inductive coil, or for a non-inductive coil in the same direction as in forming the first helix), and the wire from the drum g is guided by hand or by a tool into the groove, being thus virtually wound from the outside inwards. The disc b is removed, the reel l put into the position shown in dotted lines, and the operations repeated. Any slack remaining between the two helices is taken up by rotating the disc b on the mandrel relatively to the disc a. Sheets of paraffined paper or the like may be placed between the sections, and, in place of the drum g, a separate cylinder &c. mounted on an independent shaft and working freely during the winding-off of the wire may be employed. For paraffining the wire as it passes into the helices, the device shown in Fig. 8 may be used. This consists of a trough t carried by a handle s and containing a grooved roller u, the spindle of which is fixed at one end v only, so that the wire may be passed through a loop w and thence under the roller. The trough may be heated by a lamp or burner. In order to allow the helices to be examined at intervals, the inner face of the disc b is recessed to receive a cross-shaped device having four arms, and pins projecting from the latter through the disc terminate in a circular ring. On sliding away the disc laterally, the helix is still held firm by the cross-armed device. In making long coils in which the helical surfaces tend to become uneven, after winding a pair of helices, the disc a, Figs. 5 and 6, is removed from the mandrel, thus allowing the helices to be backed on to a sleeve 8. The disc a has a slot at one side in which fits by means of tongues and grooves a sliding piece 2, kept in position by a pivoted plate 4 having a notch 5 at one end held under the head of a screw 6. The wires, one of which may be uninsulated, may be wound simultaneously in making a non-inductive resistance, and the first winding may be virtually from the outside to the inside. The Provisional Specification states that, in place of threading the reel l through the centre of the disc b, the wire may be passed through a radial slot cut in the latter, and that the wire from the drum g may be wound into a second "former" on a separate spindle, the helix thus formed being removed and placed against the first section.