BELT FOLDING BACK METHOD AND APPARATUS IN TIRE MOLDING MACHINE

摘要

PURPOSE:To simply perform folding back work and to obtain a width dimension of high accuracy by providing a habit forming apparatus for forming a folding back habit only to a rubber layer along the longitudinal direction of a belt material on the rear side of the folding back position of the belt material supplied to a molding drum. CONSTITUTION:A belt material W having a predetermined length is supplied to a tire molding drum 1 from a member supply apparatus 4 to be wound around said drum 1. When both side edge parts of the belt material are folded back to the outside, a cylinder 10 is preliminarily operated to allow the leading end of a hot knife 8 to protrude from the guide hole 7 formed to a feed surface 4a toward the rear of the folding back position Wa of the belt material W supplied to the molding drum 1 from the member supply apparatus 4 and a folding back habit 5 is formed only to the rubber layer Tb of the belt material W along the longitudinal direction. By folding back the belt material W wound around the molding drum 1 by a bladder or a ring, stress is conc. to the habit part and this habit part becomes a folding line naturally and the predetermined position of the belt material W is folded back over a predetermined width with good accuracy.