Tread Extension Clamping for Two-Direction Retread Brushing
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Solution Overview
Problem
In the retreading process, existing methods often result in irregular finishing patches due to insufficient brushing of tread longitudinal ends in aggressive tread patterns, requiring manual re-brushing and additional time and labor.
Innovation Solution
A tread extension device that secures to the tread, allowing it to be brushed in two directions along its entire length by attaching first and second tread extensions to the longitudinal ends using connecting devices with needle assemblies and clamps, ensuring the entire underside surface is prepared uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread is held at one end during brushing, then the brushing operation can be performed safely without jamming, but the longitudinal end held during brushing cannot be brushed in that direction
Solution Approach 1:
The invention divides the brushing operation into two separate passes: first brushing the intermediate section and one longitudinal end, then repositioning to brush the other longitudinal end. This segmentation allows each end to receive adequate brushing while maintaining operational safety by always holding one end during each pass.
Solution Approach 2:
The invention performs preliminary brushing of the intermediate section and first longitudinal end before repositioning to brush the second longitudinal end. This preliminary action ensures that the majority of the tread surface is prepared first, then the remaining end is addressed in a second pass.
2Productivity
If the tread is brushed in one direction only, then the brushing operation is simple and fast, but irregular finishing patches occur in longitudinal ends for aggressive tread patterns
Solution Approach 1:
The invention applies periodic action by performing brushing in two distinct directions through two separate passes. The first pass brushes in one direction covering the intermediate section and first end, while the second pass brushes in the opposite direction covering the second end, ensuring uniform finishing quality across the entire tread surface.
3Manufacturing precision
If manual re-brushing is performed to correct irregular patches, then finishing quality is improved, but additional time and labor are required
Solution Approach 1:
The invention ensures continuity of useful action by designing a two-pass brushing process that proactively prevents irregular patches from forming in the first place. By brushing each longitudinal end in two different directions during the two passes, the system eliminates the need for corrective manual re-brushing, maintaining high finishing quality while minimizing total processing time.
Data Source
AI summary
A tread extension device (10) is provided that has first (12) and second (14) tread extensions for holding a tread during brushing operations. A first connecting device (28) connects the first tread extension (12) to a first longitudinal end (18) of the tread, and engages both the first tread extension (12) and the first longitudinal end (18) of the tread. A second connecting device (30) is included that connects the second tread extension (14) to the second longitudinal end of the tread. The second connecting device (30) engages both the second tread extension and the second longitudinal end of the tread. The tread is able to be brushed in both a first direction and a second direction along its underside.