OVERLAP AMOUNT MEASUREMENT DEVICE AND OVERLAP AMOUNT MEASUREMENT METHOD

摘要

An apparatus and method is provided for accurately measuring an amount of overlap in joining together the end portions of a sheet-shaped member constituting a tire. The amount of overlap of the front end and the rear end of the sheet-shaped member is measured when the sheet-shaped member having been molded into a predetermined length with molding marks extending on the surface in width direction thereof is wound around the periphery of a molding drum from the front end. In doing so, a detecting means detects a first molding mark formed on the sheet-shaped member on the rear end side and a second molding mark formed on the the sheet-shaped member on the front end side by capturing images of an entire area including the overlap from above by image capturing means. And a calculating means calculates the amount of overlap by measuring the distance between the first molding mark and the second molding mark on the sheet-shaped member from the frames of captured images.