Alternating Bead-Apex Stitching Members for Uniform Adhesion
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Solution Overview
Problem
Existing bead-apex stitching devices face challenges in achieving both smooth and strong stitching of an apex to a bead, as excessive pressure results in a non-uniform bead-apex while soft pressure fails to ensure proper adhesion.
Innovation Solution
A bead-apex stitching device employing two sets of stitching members with different pressure distribution mechanisms: one set for even pressure distribution to ensure smoothness and another for concentrated pressure at the base for strong adhesion, arranged in an alternating pattern to optimize both qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the presser member is pressed hard, then the apex is strongly stitched to the bead, but the resulting bead-apex is not smooth or uniform
Solution Approach 1:
The stitching device is divided into two separate sets of stitching members: the first set applies distributed pressure for smoothness, while the second set applies concentrated pressure for strong adhesion. This segmentation allows each set to be optimized for its specific function without compromising the other quality attribute.
Solution Approach 2:
Different stitching members are designed with different pressure distribution characteristics. The first stitching members distribute pressure evenly over a larger area to achieve smoothness, while the second stitching members concentrate pressure at specific locations to achieve strong adhesion. This local quality differentiation resolves the contradiction between smoothness and strength.
2Manufacturing precision
If the presser member is pressed softly, then the resulting bead-apex is smooth and uniform, but the apex is not properly stitched to the bead
Solution Approach 1:
The stitching process is segmented into two distinct phases performed by two different sets of stitching members. The first set performs the smoothness function with soft, distributed pressure, while the second set performs the adhesion function with harder, concentrated pressure. This segmentation eliminates the need to choose between the two conflicting quality requirements.
Solution Approach 2:
The first set of stitching members performs the preliminary action of creating a smooth, uniform bead-apex surface before the second set of stitching members applies the concentrated pressure needed for strong adhesion. This sequential preliminary action ensures that both smoothness and strength requirements are met in the final product.
3Device complexity
If a single set of stitching members is used, then the device complexity is reduced, but the quality of stitching cannot be optimized for both smoothness and strength
Solution Approach 1:
Rather than using a single set of stitching members that would have to compromise between smoothness and strength, the device is segmented into two specialized sets. This segmentation increases device complexity but enables each set to be optimized for its specific function, ultimately improving overall stitching quality.
Solution Approach 2:
Each set of stitching members is designed with specific local qualities appropriate for its function. The first set has characteristics optimized for distributed pressure and smoothness, while the second set has characteristics optimized for concentrated pressure and adhesion. This local quality optimization justifies the increased device complexity.
Data Source
AI summary
The invention relates to a bead-apex stitching device, a bead-apex station and a method for stitching an apex to a bead, wherein the bead-apex stitching device comprises a first set of first stitching members distributed in a circumferential direction about a central axis for stitching the apex to the bead and a second set of second stitching members for stitching the apex to the bead in a manner different from the first stitching members of the first set, wherein the second stitching members of the second set are distributed in an alternating pattern with the first stitching members of the first set in the circumferential direction.