To provide a steel cord comprising uniformly arranged wires even by carrying out the collection and twisting of wires under nonrestriction conditions by arranging plural reform pins on each side face of a square pillar of a preform apparatus zigzag and in a shifted state by the diameter of the wire between adjoining side faces so as not to make a reform phase uniform between the wires.
A tubular twisting machine in which plural reform pins 61-64 are arranged zigzag on side faces 6-1 to 6-6 of a prism such as a hexagonal pillar of a preform apparatus 6 in the direction of the generating line of the square pillar and in a shifted state by the diameter of the wire between adjoining side faces in the direction of the generating line is used. Plural wires released from plural bobbins are passed through the preform apparatus 6 and reformed. The wires are collected through a twisting guide and twisted to form a steel cord.
NISHIGAITO KATSUSHI
KUBO YASUSHI
