GB694366A - Method of and machine for making grommets from wire, cord or other suitable material - Google Patents

Abstract

694,366. Making joint-making packing; coiling. BRITISH ROPES, Ltd., and ELKINGTON, R. June 4, 1951 [June 2, 1950], No. 13852/50. Classes 83 (ii) and 83 (iv). [Also in Group XXV] A grommet is made from a predetermined length of wire, or other material, prewound on a bobbin, by fastening one end thereof to an endless core which is then axially traversed while the major part of said length is mechanically wound thereon by moving the bobbin in a fixed circular path about an axis formed by one run of the core and then severing the core and withdrawing it and at the same time tucking the final part of said length of wire into the hole left thereby. The machine for effecting the first step comprises two grooved wheels 12, 13 carrying the endless core, mounted on vertical shafts 37, 137, the former being driven from a motor through belt and worm gearing 31, 35 and the latter adjustable by hand-operated screws 16 to tension the core. A bracket 43 carries a slit tube 42 concentric with one run of the core and a slit and a toothed disc 41 is mounted to rotate on this tube 42, being driven by the motor through a pinion on the shaft 33. The bobbin 45, which carries the length of wire, is freely mounted in a bracket 46, Fig. 4, adjustably carried by a spindle 47 freely mounted in the disc and connected by a crank 48 to a slit annulus 50 free to rotate about an axis eccentric to the tube 42, being supported by this tube and by two rollers 51, Fig. 6. This arrangement keeps the axis of the bobbin from angular displacement as it moves. The said major part of the wire may be preformed helically before the whole is wound on the bobbin 45. When the core is all covered the machine is stopped and the core is exposed and severed at the starting-point. The remaining length of wire is then tucked in, as the core is removed, by suitable hand-tools while the machine traverses the work slowly. The slits 52 are arranged to coincide in their highest position for the insertion of the core and the removal of the grommet.