DRUM FOR MANUFACTURING BELT AND TREAD OF A TIRE

摘要

The invention relates to a method and a building drum (1) for manufacturing a package of a belt layer (6) and a tread layer (7) into a substantially cylindrical tire component, wherein the drum is rotatable about a drum centre line (2) and comprises a rigid support surface (3) for the tire component situated at the outward facing circumferential surface of the drum, wherein the drum comprises two support members (4, 5) which are arranged spaced apart in a substantial longitudinal direction of said drum, wherein the support members (4, 5) each comprises a tread support surface (41, 51) which faces away from the drum centre line and which tread support surfaces are radially movable between a retracted position wherein the tread support surface is arranged at or near the rigid support surface, and a raised position wherein the tread support surface is arranged in a radially outward position with respect to the rigid support surface.

主权项

1. A method for manufacturing a package of a belt layer and a tread layer into a cylindrical tire component, wherein the method comprises the steps of:
providing a belt and tread drum which is rotatable about a drum centre line, and comprises a rigid support surface for the tire component, wherein said support surface is situated at the outward facing circumferential surface of the drum, wherein the belt and tread drum comprises two support members which are arranged spaced apart in a longitudinal of said drum, wherein the support members each comprises a tread support surface which faces away from the drum centre line and which tread support surfaces are radially movable with respect to the rigid support surface, wherein the support member is arranged in a retracted position wherein the tread support surface is arranged at or near the rigid support surface, arranging one or more belt layers around the belt and tread drum on the rigid support surface, wherein the one or more belt layers are arranged to run between the two support members, moving the support member into a raised position with respect to the rigid support surface wherein the tread support surface is arranged at a radially outward position with respect to the rigid support surface, arranging a tread layer around the belt and tread drum on the one or more belt layers, wherein a leading end and a trailing end of the tread layer overlap at an overlap area, wherein the tread layer is arranged such that the overlap area is positioned partially on top of said tread support surfaces, and using a stitching device comprising a stitching roll to stitch the overlapping leading end and trailing end of the tread layer together.