Tire Building Apparatus with Independent Stitching Rolls
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Solution Overview
Problem
Existing tire building methods face challenges in achieving a secure bond without voids when spirally winding ribbon-shaped rubber strips, as conventional holding rolls struggle to apply sufficient pressure across the entire width due to variations in strip posture and thickness, leading to incomplete bonding and void formation.
Innovation Solution
A tire building method and apparatus that incorporates a holding roll and two sets of stitching rolls arranged in parallel to ensure independent pressing motions, with the stitching rolls positioned ahead in the advancing direction to address concave portions caused by spiral winding, ensuring comprehensive bonding without voids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simply cylindrical-shaped holding roll is used to press rubber strips during spiral winding, then the apparatus structure is simple, but the pressing force is insufficient on fore concave portions leading to incomplete bonding and void formation
Solution Approach 1:
The holding roll is divided into multiple independent pressing sections (first holding roll section, second holding roll section, third holding roll section) along the advancing direction. Each section can independently apply pressing force to different regions of the rubber strip, specifically targeting fore concave portions that were previously insufficiently pressed. This segmentation allows the system to maintain structural simplicity while achieving comprehensive bonding quality.
2Productivity
If rubber strips are spirally wound with partial overlapping to improve conformability, then productivity and conformability are improved, but variation in laminated posture occurs causing insufficient pressing and voids
Solution Approach 1:
Different holding roll sections are positioned to apply pressing forces at specific locations where laminated posture variation occurs during spiral winding. The first, second, and third holding roll sections target different regions along the advancing direction, providing localized pressing quality exactly where needed to compensate for the posture variations inherent in spiral winding with partial overlapping.
3Manufacturing precision
If a holding roll presses the entire width of the rubber strip, then comprehensive bonding is achieved, but the roll cannot adequately press fore concave portions due to posture variation
Solution Approach 1:
The holding roll system transitions from a static, uniform pressing approach to a dynamic, multi-section pressing system. Each holding roll section (first, second, third sections) can independently adjust its pressing action along the advancing direction, allowing the system to adapt to the dynamic posture variations of the rubber strip during spiral winding while maintaining comprehensive bonding coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and apparatus effectively prevent the generation of voids by ensuring consistent pressure across the rubber strip width, even in cases of varying postures and thickness, resulting in a secure and complete bond during tire construction.
Implementation Method 1
causing the holding roll to press and bond the rubber strip in a position, in which the rubber strip is wound round a peripheral surface of the rotary support body
Implementation Method 2
causing the stitching roll positioned fore in an advancing direction of the traverse movement, out of the two sets of stitching rolls, to perform a pressing motion in a regional part just after the press whereby a fore part of the rubber strip in the advancing direction is pressed and bonded
Data Source
AI summary
The invention can surely accomplish lamination without the generation of voids in building a tire constructed to comprise a plurality of rubber members for a tire when a ribbon-shaped rubber strip (R) is spirally wound and laminated, and uses holding rolls (30) and two sets of stitching rolls (40a), (40b) arranged in parallel with a center of a rubber strip width (W) therebetween to enable performing of an independent pressing motion, such that the rubber strip (R) is pressed and bonded by the holding rolls (30) in a position, in which the rubber strip (R) is wound, and the stitching roll (40a) or (40b) positioned fore in an advancing direction of traverse movement, out of the two sets, is caused to perform a pressing motion in a regional part just after the press whereby a fore part of the rubber strip in the advancing direction is pressed and bonded.