Method of folding tire breaker ply edges
AssigneeThe Goodyear Tire & Rubber Company
InventorsDouglas Raymond Weaver, Joseph Anthony Farelli
Life of this patent
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Abstract
Circumferentially spaced folding modules of a tire building drum have axially movable belt lifting and conveying nose pieces which carry wide breaker ply edges over narrow breaker ply edges laid on the drum.
Claims10
A method of building a folded breaker for a tire building drum having a plurality of drum folding modules at spaced apart edge positions circumferentially of said drum with each module having a belt with a first belt end fastened to said module and a second belt end fastened to an axially movable nose member comprising:
- a. wrapping a wide breaker ply around said drum and said first belt end of each said belt fastened to said module and splicing the leading edge and trailing edge together,
- b. wrapping a narrow breaker ply having a width less than the width of said wide breaker ply around said wide breaker ply exposing an overlap edge of said wide breaker ply at each edge of said wide breaker ply and splicing the leading edge and trailing edge of said narrow breaker ply, characterized by,
- c. folding each said overlap edge of said wide breaker ply over each edge of said narrow breaker ply by moving said belt carrying each said overlap edge over each said edge of said narrow breaker ply and by moving said nose member over each said edge of said narrow breaker ply.
A tire building drum assembly for folding edges of a wide breaker ply over edges of a narrow breaker ply wrapped around said wide breaker ply comprising a plurality of circumferentially spaced drum segments characterized by a center module mounted on each of said drum segments, a folding module mounted on each of said segments at each end of said center module, each said folding module having a nose piece movable axially of said drum from an axially outer position having the same diameter as the diameter of said center module to an axially inner position overlapping said center module, a folding belt wrapped around each said nose piece with an axially inner end fastened to said center module and an axially outer end connected to a spring means on said nose piece for maintaining tension in said belt providing a support for an overlap edge of said wide breaker ply in the axially outer position of said nose piece and providing for sliding movement of said belt over said nose piece upon said axial movement of said nose piece to said axially inner position for folding each said overlap edge of said wide breaker ply over each said edge of said narrow breaker ply.
Dependencies are inferred from the claim text.