GB859605A - Improvements in or relating to apparatus for making electrical connections - Google Patents

Abstract

859,605. Coiling wire on terminals; wiring printed circuit boards. STANDARD TELEPHONES & CABLES Ltd. June 5,1959 [June 9, 1958], No. 18416/58. Classes 83 (2) and 83 (4). A wire-wrapping tool for wrapping wire about a terminal, has a rotatable wrapping bit mounted for axial and rotary movement in a sleeve and arranged to be moved axially against a spring or like loading force by the wire during the wrapping operation, whereby adjacent turns of the wire touch each other. Wire W to be wrapped around a terminal T projecting from a panel P is laid in a channel 5 in a rotatable bit 2 so that its end abuts a step 6, the other end passing through a slot 9 in a sleeve 3, surrounding the bit 2, where it is held by an operator against the base of the terminal T accommodated in a recess 4 in the bit 2. A driving member 7 then rotates the bit 2 to wrap the wire in the channel 5 around the terminal T, the bit 2 being forced back by the wound wire against a spring 8, to operate, at the end of its traverse, contacts or a micro-switch between it and the driving member 7 to actuate a light or buzzer. In another embodiment, Fig. 6, to wrap wire around both a terminal T and a further piece of wire extending alongside it, a pre-cut length of wrapping wire W is inserted in the channel 5 and its outer end is clamped between inturned ends 9, 10 of a sleeve 3 split longitudinally and contracted by a wedge-shaped end-portion of a further sleeve 11 on axial movement thereof. The bit 2 is then rotated to wrap the wire. In a further embodiment, Fig. 7, a notch 16 at the end of a sleeve 14 surrounding the bit 2 serves to cut off the wire W, after wrapping, on turning the sleeve. In another embodiment, Fig. 11, the outer end of the wire W is wound round a lug 20 on a sleeve 19 surrounding the bit 2 and after wrapping the wire on the terminal T the sleeve 19 is rotated so that the wire W is cut off by one of the edges of the terminal T. In a power-driven embodiment, Fig. 13, the bit 2 is rotated, through a clutch 23a, 23b, by an armature 22. The armature spindle, the forward end of which is secured to the bit 2, is secured at its other end to a sleeve 24 screwed into a housing 25 for a collet 26. Wrapping wire W is fed from a reel through the collet 26, the spindle of the armature 22, along the channel 5 in the bit 2 and the end is wound on a lug 20 on the sleeve 3. In operation the bit 2 is rotated to wrap the wire W and as wrapping proceeds the bit 2, armature 22 and spindle, sleeve 24 and collet 26, are moved axially back against a spring 8 until the collet 26 abuts a stop 27, whereupon it is forced into the sleeve 24 to close and grip the wire W. Continued rotation of the bit 2 tightens the wire until it breaks off at the edge of the terminal T. An automatic machine, Figs. 15, 16, for securing lead-out wires 39 of components 40 on a printed circuit board 37 to terminals 35 of metal strips 33 having tags 34 fitted into holes 36 in the board, comprises a fixed tool head 28 and a movable tool-head 29 adjustable according to the distance between two terminals to be wrapped. Each head includes a jaw 30 and a jaw 31 pivoted to close to clamp the wires W and 39 to the strip 33 and surround a bit 2, accommodating the terminal and wire 39, secured in a rotatable sleeve 41. The wire W passes through off-centre holes in the bit 2 and in a fixed core-member 43 coaxial with the bit 2, having been fed by rolls 45. Rotation of the bit 2 shears the wire W where it leaves the core 43 and as wrapping proceeds the tool moves back against the action of a spring (not shown). Specification 817,428 is referred to.