Tire Strip Joining via Overlap and Width Measurement
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Solution Overview
Problem
Existing tire manufacturing devices face challenges in achieving accurate and strong joint connections between strip-shaped members due to complex structures and limited joint areas, leading to instability and difficulty in continuous, automatic joining.
Innovation Solution
A device and method that includes a drum for arranging strip-shaped members with a joint portion of smaller thickness, measuring the width between members, and rotating the drum to position them accurately for overlapping and joining, ensuring precise alignment and increased joint strength through a frame with abutting means for secure bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If side portions of strip-shaped members are abutted and joined together without overlapping, then the occurrence of steps in side portions is prevented, but the joint area is small and the structure becomes complicated
Solution Approach 1:
The invention transitions from abutting side portions edge-to-edge (1D contact) to overlapping side portions with a width greater than zero (2D contact area). By making the overlapping width in the circumferential direction greater than zero, the joint area is significantly increased while maintaining flatness, resolving the contradiction between joint area and shape flatness.
2Strength
If a rubber portion having a small thickness is provided on a side portion to increase joint area, then joint strength is improved, but it is difficult to continuously and automatically join with accuracy
Solution Approach 1:
The invention replaces the complex mechanical alignment system required for precise edge-to-edge abutting with a simplified system based on predetermined overlapping positioning. The drum rotation control system automatically positions members based on their width measurements, eliminating the need for complex real-time mechanical alignment mechanisms and enabling continuous automatic operation with high accuracy.
Solution Approach 2:
The invention incorporates a feedback mechanism where the width of each strip-shaped member is measured, and based on this measurement, the drum is controlled to rotate to a position that ensures accurate overlapping. This closed-loop feedback system enables continuous automatic joining with high precision, resolving the contradiction between joint strength and automation capability.
3Strength
If the joint area of side portions is increased by overlapping, then joint strength is improved, but the structure becomes more complex and manufacturing accuracy is difficult to maintain
Solution Approach 1:
The invention performs preliminary measurement of each strip-shaped member's width before joining. Based on these pre-measured values, the drum rotation position is predetermined and controlled in advance, ensuring accurate overlapping positioning. This preliminary action approach simplifies the joining process and maintains high manufacturing precision while achieving large joint area.
Data Source
Figure 1~2B
Figure 3
Figure 4A~4D
AI summary
Side portions of a plurality of strip-shaped members to be arranged on a drum are positioned accurately and joined with accuracy while sufficient joint strength is assured. The drum (2) is rotated each time the strip-shaped member (90) is arranged by arranging means (10), and a plurality of the strip-shaped members (90) are sequentially arranged in a drum peripheral direction. The side portions of the adjacent strop-shaped members (90) are joined by joining means (40) so as to manufacture a constituent member of a tire. A joint portion whose thickness is relatively small is provided on one of the side portions of the strip-shaped member (90), and the plurality of strip-shaped members (90) are arranged by overlapping the joint portion on one of the side portions and the other side portion. A width between the both side portions of each strip-shaped member (90) is measured, the drum (2) is rotated based on the measurement result of the width, and the positions of the side portions to be overlapped and arranged are matched.