Rubber Strip Affixing Roller Position for Tire Drum Accuracy
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Solution Overview
Problem
The existing methods for affixing rubber strips on tire forming drums result in radial misalignment due to differences in velocity between the outer and inner edges of the rubber strip, leading to inaccuracies in tire formation.
Innovation Solution
A method and device where the rubber strip is supplied at a right angle to the drum side surface and affixed using a roller with its shaft center positioned downstream from a reference line, creating a velocity vector component that counters the outward tension, thereby reducing radial misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rubber strip is affixed using a pressing roller at the reference line position, then the affixing process is simple, but radial misalignment occurs due to velocity difference between outer and inner edges
Solution Approach 1:
The invention moves the pressing roller from the reference line position (radial dimension) to a downstream position in the drum rotation direction (tangential dimension). This dimensional shift creates a velocity vector component that counteracts the radial outward tension, resolving the misalignment problem without increasing radial complexity
Solution Approach 2:
The invention changes the positional parameter of the pressing roller from being at the reference line (distance = 0) to being at a downstream distance L (20-40 mm) in the drum rotation direction. This parameter change transforms the velocity vector relationship, creating an inward component that balances the outward tension and achieves accurate affixing
2Ease of manufacture
If the rubber strip is supplied at a right angle to the drum side surface, then the supply method is straightforward, but the outer edge moves faster than the inner edge causing misalignment
Solution Approach 1:
The invention applies preliminary anti-action by positioning the pressing roller downstream to create an inward velocity component before the affixing process completes. This preemptive counter-force balances the outward tension caused by differential velocity, preventing misalignment rather than correcting it after occurrence
Solution Approach 2:
The invention introduces dynamic consideration by accounting for the velocity difference between outer and inner edges of the rubber strip during affixing. By positioning the roller at distance L downstream, the system dynamically balances the velocity vectors, allowing the rubber strip to be affixed accurately despite the inherent velocity gradient
Data Source
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AI summary
Trough use of an applicator, a rubber strip is supplied to the drum side surface in a conveyance direction at a right angle to a reference line extending over the drum side surface from the shaft center of the drum outward in the radial direction. The supplied rubber strip is pressed against and affixed to the drum side surface using an affixing roller. The affixing roller is supported so as to be able to rotate about a roller shaft center parallel to the reference line. The roller shaft center is disposed at a distance (L) downstream from the reference line in the drum rotation direction.