Manufacturing method and forming device for tire

A tire manufacturing method, comprising:

• sequentially arranging and bonding one band-like strip material comprising a plurality of reinforcing cords arranged in parallel with each other and coated with an unvulcanized rubber to a forming surface located on an outer circumferential side of a rigid core in a circumferential direction of the rigid core such that the reinforcing cords are extended in an oblique direction at a predetermined inclination angle with respect to the circumferential direction, thereby forming a belt layer in which the strip materials that are bonded adjacent to each other in the circumferential direction are bonded;
• constructing a belt multilayer structure by layering a plurality of the belt layers in which the reinforcing cords of the belt layers vertically adjacent to each other have opposite inclination directions with respect to the circumferential direction;
• forming a green tire having the belt multilayer structure;
• and
• vulcanizing the green tire,
• the method comprising:
• when constructing the belt multilayer structure, forming each of the belt layers by repeatedly performing a step of holding in a vertically sandwiched manner, by a pair of gripping portions of one holding machine, the one strip material supplied through one strip material supply line, moving and placing the strip material into one arrangement unit, and bonding the strip material placed in the arrangement unit to the forming surface, in which the pair of gripping portions is vertically turned while the pair of gripping portions holding the strip material moves from the strip material supply line to the arrangement unit, thereby the strip material held by the pair of gripping portions is turned upside down and placed in the arrangement unit so that the inclination directions of the reinforcing cords of the belt layers vertically adjacent to each other are opposite to each other;
• wherein
• the strip material supply line has two conveying mechanisms which are disposed with a gap therebetween, the one strip material supplied straddles the gap so that the one strip material bridges over each of the conveying mechanisms, and the pair of gripping portions inserted between the gap vertically sandwich and hold the strip material.