Winding method and winding device for bead filler for tire
View Patent ↗A rubber strip is transported to a molding drum. At this stage, a cutter cuts the rubber strip into a predetermined length. If a sensor detects the finishing end of the rubber strip when the rubber strip is transported, a sucker, which transports the rubber strip while drawing the rubber strip, is temporarily stopped or the movement speed of the sucker is decreased. As a result, a top portion of the rubber strip is extended in the longitudinal direction of the rubber strip. This compensates for the amount of shrinkage of the rubber strip after extrusion, thus restraining shrinkage of the rubber strip.
1. A winding method for a bead filler for a tire including winding a rubber strip of a predetermined length in an annular shape and joining opposite ends of the rubber strip to each other,
wherein, the rubber strip has a flattened triangular cross section,
a thickest section of the rubber strip corresponds to a base portion and a thinnest section of the rubber strip corresponds to a top portion, and
prior to the opposite ends of the rubber strip contacting one another, in at least one of the opposite ends of the rubber strip, the top portion is extended without an extension of the base portion.
2. The winding method for the bead filler for the tire according to claim 1 ,
wherein one of the opposite ends of the rubber strip is held by being drawn, the held end section of the rubber strip being pulled and extended in a direction opposite to a transport direction of the rubber strip.
3. The winding method for the bead filler for the tire according to claim 2 ,
wherein the rubber strip is transported to a molding drum by a conveyor, a starting end of the rubber strip being drawn by a drawing member and then moved from the conveyor onto an outer peripheral surface of the molding drum before drawing is stopped, the rubber strip being then wound around the outer peripheral surface of the molding drum in an annular shape, the drawing member being returned to an upstream side in the transport direction of the rubber strip such that a finishing end of the rubber strip is drawn by the drawing member before winding of the rubber strip is ended, the rubber strip being extended in this state.