Belt member producing method

Abstract

There is provided a belt member producing method including forming a strip piece 17 of a predetermined width W by cutting a strip material 12 including a plurality of reinforcement cords 11 to a regular size, conveying the strip piece 17 to a transfer conveyor 22 in such a manner that cut sides 19 of the strip piece 17 are in parallel with a traveling direction B of the transfer conveyor 22 and overlapping continuously an integral number Nint of strip pieces 17 on each other on the transfer conveyor 22 in such a manner that the strip pieces 17 are overlapped on each other by an overlapping amount P along non-cut sides 18 thereof, so as to produce a belt member 30 having a desired length equal to a predetermined length L of a belt layer of a pneumatic radial tire, the belt member producing method being characterized by including selecting a desired cutting angle θpre relative to a traveling direction A of the strip material 17 when the strip material 12 is cut to the regular size, calculating a number Ncal of strip pieces 17 necessary for forming a belt member 30 by the following equation (1), rounding up the number Ncal so calculated to the integral number Nint and calculating an overlapping amount P of the strip pieces 17 by the following equation (2), so as to determine the integral number Nint and the overlapping amount P. Ncal=(L/W)×sin θpre  (1) P=W−L×sin θpre/Nint  (2)

Dependencies are inferred from the claim text.