Patent ID: 6669798
Filing Date: 2003-12-30
Classification: B29D,B60C,Y10S,Y10T

Abstract:
A method of manufacturing a belt member for a pneumatic radial tire comprising the steps of:feeding a strip material including a plurality of reinforcing cords from a standard measure feeding device which is adjustable in feeding angle to a carrier conveyor; cutting the strip material to a predetermined size in sequence to form strip pieces having a predetermined width A while alternately moving the strip material and the carrier conveyor intermittently in synchronization with each other; transferring the strip pieces onto the carrier conveyor; determining an integer number Nint of strip pieces necessary to form a belt member having a desired length equal to a predetermined length L of a belt layer for the tire with the strip pieces having the predetermined width A by: selecting a preferred cutting angle &thgr;pre for the strip pieces; calculating a number Ncal of strip pieces required to form the belt member by applying the following formula: Ncal=(L/A)Ã—sin &thgr;pre; rounding the calculated number Ncal of strip pieces either up or down to an integer number Nint; and setting an actual cutting angle &thgr;a for the integer number Nint of strip pieces by applying the following formula: &thgr;a=sinâˆ’1 (NintÃ—A/L); and butting the Nint strip pieces cut at the actual cutting angle &thgr;a sequentially against each other along their longitudinal edges to form the belt member having the desired length equal to the predetermined length L of the belt layer for the pneumatic tire.