Patent ID: 8945323
Filing Date: 2015-02-03
Classification: B29D

Abstract:
1. A method of forming a carcass band for forming a tire, comprising: pasting a carcass ply sheet onto a rubber sheet member that is wound around a building drum; then, pressing the carcass ply sheet from its outer periphery using a stitcher apparatus comprising wherein the building drum is placed inside of the circle line, and the building drum is moved in axial direction relative to the pressure-bond rollers inside a circular array of the pressure-bond rollers during the pressing step, and wherein, when the building drum is moved in the axial direction relative to the pressure-bond rollers, the pressure-bond rollers are moved inward in a diameter direction such that the inscribed circle diameter of the pressure-bond rollers in the circular array is made to be smaller than the outer diameter of the carcass ply sheet on the building drum, and whole periphery of the carcass ply sheet is pressed to be bonded simultaneously by the pressure-bond rollers with a preset pressure, wherein the carcass ply sheet is pressed by the pressure-bond rollers to pressure-bond from a center portion in a width direction over to a side end by moving the building drum relative to the pressure-bond rollers of the stitcher apparatus starting from a vicinity of a center portion to the side in the axial direction, wherein the pressure-bond rollers of respective rows are advanced inward in the drum diameter direction, in a state that positions of the pressure-bond rollers are arranged in the drum peripheral direction such that at least portions of the pressure-bond rollers of contiguous rows overlap each other in the drum axial direction, while the pressure-bond rollers are not spaced apart by intervals in the drum peripheral direction as a whole, wherein each of the pressure-bond rollers are axially supported by a bracket provided at a front end portion of an output shaft of the air cylinder, and capable of being independently shifted, and retracting the pressure-bond rollers in a non-pressing operation state, so that an interval between the rollers in the peripheral direction of the drum is larger than a roller width.