GB1389064A - Method and apparatus for winding cores with aperture or openings - Google Patents

Abstract

1389064 Winding toroidal helices PULSE ENG Inc 2 March 1972 [4 March 1971] 9745/72 Heading B3E Apparatus for winding wire on to a core with a central opening comprises means for feeding and guiding the wire into a single layer of circular loops each passing through the opening, means for simultaneously rotating all the loops through the opening at a rate faster than the rate of feed of the wire, and means for anchoring one end of the wire, whereby turns of wire are sequentially wound on to the core. The apparatus shown comprises an inwardly facing fixed circular channel 22 formed by a lower aluminium annulus 26, an upper transparent annulus 34, and an intermediate brass annulus 28. The channel is interrupted by a wire entry gap 72, a gap for the core 20 to be wound, and by two pairs of wire advancing rubber surfaced rollers 16, one of each pair being driven. The wire is fed by rollers 62, 64; Fig. 2, through tube 56 which has a curved end to impart to the wire a curvature somewhat less than that of channel 22 and to deliver it to the channel through gap 72. The leading end of the wire follows the radially outermost part of the channel, and is advanced by the rollers 16, so as to form a series of loops passing through the core aperture 19 and radially outward of a spring pressed ball 40 extending across the channel. When sufficient wire is in the loops, a solenoid is actuated to rock arm 65, Fig. 2, to disengage roller 64 from roller 62 and clamp the wire between roller 68 and plate 69, anchoring the wire. The loops are still rotated by rollers 16, each shaped as part of a cone with vertex at 45 to give all loops equal angular velocity. The innermost loop tightens and is pulled past ball 40 and further tightened to form a first turn on core 20. At this point a cutter 58 severs the wire at the end of tube 56. Each further revolution of the loops makes another turn on the core, which is slowly rotated to produce juxtaposed turns. Two or more wires may be fed in together through individual tubes 56, to form interleaved loops and thus interwound turns. The leading ends of such wires are staggered, and they are sequentially anchored, so that consecutive turns on the core are consecutively tightened. The core feed and rotating mechanism is shown in Fig. 10, where a core 20 is held in grooves in driven roller 90 and idlers 92 on an arm 94. To change cores, a first solenoid is operated to release a lock on arm 94, and a second solenoid is then operated to rotate arm 82 with plunger 80 first anticlockwise to allow the next core to fall down shoot 78, and then clockwise to push the new core into engagement with the rollers and discharge the wound core. The lock on arm 94 automatically re-engages.