Method of building carcass band and stitcher apparatus

A stitcher apparatus for pressing a carcass ply sheet from its outer periphery as to be pressure-bonded onto a rubber sheet member after that the carcass ply sheet is pasted onto the rubber sheet member wound around a building drum, the stitcher apparatus including:

• a ring-shaped frame that allows passing through of the building drum;
• and
• a plurality of pressure-bond rollers, which are arranged on inner periphery of the ring-shaped frame and each of which has a roller axis tangential to a circle line that is concentric to and larger than the building drum;
• and each of the pressure-bond rollers is supported by a respective mechanism for extracting and retreating the each roller as to be shiftable to inward in diametrical direction;
• the pressure-bond rollers are arrayed, in a plurality of rows, throughout an entire range of the circle line by a constant pitch in peripheral direction;
• arraying of the pressure-bond rollers is made such that;
• their positions in peripheral direction are staggered between adjacent rows of the rollers, so as to avoid forming of a spacing by the rows of the rollers as a whole, at least at a time each of the pressure-bond rollers in each of the rows has been shifted inward in the diameter direction;
• and
• the pressure-bond rollers are constructed such that;
• when the building drum is moved in axial direction relative to the pressure-bond rollers at inside of circular array of the pressure-bond rollers, whole periphery of the carcass ply sheet is pressed to be bonded simultaneously by the pressure-bond rollers, each of which is shifted inward in a diameter direction, with a preset pressure.