Weft Extraction Hook and Anvil Mechanism for Tire Ply
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Solution Overview
Problem
Existing methods for removing weft threads during tire manufacturing are inefficient, leading to irregularities in reinforcing thread spacing and potential weakening of rubber bridges due to residual weft threads.
Innovation Solution
A device with a hook and disengageable anvil that performs an alternating movement to grip and extract weft threads, ensuring complete removal by pinching them between the hook and anvil, and utilizing cutting elements and air currents for efficient extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotating knives and claws are used to cut and extract weft threads, then the majority of weft sections can be removed, but some weft sections remain intertwined with reinforcing threads causing irregularities in spacing
Solution Approach 1:
The patent extracts the harmful weft threads from the reinforcing ply by using a hook mechanism that grabs individual weft sections and pulls them out completely. The hook engages with the weft thread and extracts it from between the reinforcing threads, removing the source of spacing irregularities while preserving the regular arrangement of reinforcing threads.
Solution Approach 2:
The patent introduces a hook as an intermediary element between the cutting mechanism and the weft threads. The hook acts as a mediator that captures the cut weft sections and transports them away from the reinforcing ply, preventing them from remaining intertwined and causing spacing problems.
2Stability of the object's composition
If weft threads are present in the ply during conformation operation, then they maintain thread position, but they act against increase in spacing pitch causing irregularities at crown portion
Solution Approach 1:
The patent applies preliminary action by removing the weft threads before the conformation operation that transforms the tire blank from cylindrical to toroidal shape. By extracting the weft threads in advance, the subsequent conformation operation can proceed without resistance, allowing uniform spacing pitch increase at the crown portion without interference from the weft threads.
3Ease of manufacture
If weft residues remain after calendering, then they constitute local thickenings, but they weaken the bridges of rubber between reinforcing threads
Solution Approach 1:
The patent extracts weft threads completely before the calendering operation by using a hook mechanism that removes individual weft sections. This preliminary extraction prevents weft residues from remaining in the ply during and after calendering, eliminating the source of local thickenings and preserving the strength of rubber bridges between reinforcing threads.
Data Source
AI summary
Device intended for extracting weft threads (T) arranged transversely in a straight grain reinforcing ply (F) comprising a hook capable of gripping a weft thread (T) by performing an alternating movement between a high position and a low position, characterized in that the hook engages with a disengageable anvil capable of moving along the path (XX′) of the hook so that when the device is in operation, the anvil is engaged in contact with the hook during all or part of the descending movement of said hook, forming a clamp capable of holding a section of weft between the hook and the anvil the anvil is disengaged from contact with said hook during the remainder of the travel of the hook, so as to enable the hook to engage a weft thread (T) and to release a section of weft (T).