Band-Shaped Member Joining State Determination
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Solution Overview
Problem
Existing methods for determining the joining state of band-shaped members wound on a molding drum, such as tire treads, face challenges due to blind spots from two-dimensional laser displacement sensors, which hinder the detection of joining defects like gaps between longitudinal ends.
Innovation Solution
A method involving imaging data acquisition of band-shaped member ends before and after joining, followed by pattern matching to determine the joining state, using a molding device with an imaging unit and a joining state determination unit to assess the coincidence of acquired images with registered data, determining proper joining based on a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-dimensional laser displacement sensor is used to detect the positions of the starting end and terminating end of the band-shaped member, then the detection capability is provided, but a blind spot exists in the joint of the longitudinal ends which hinders the determination of the joining state
Solution Approach 1:
The patent transitions from two-dimensional laser displacement sensing to three-dimensional imaging using multiple cameras. By capturing images from multiple angles (front, side, and joint views) and reconstructing three-dimensional coordinates, the system eliminates blind spots at the joint area and enables comprehensive detection of the joining state between longitudinal ends of the band-shaped member.
2Loss of information
If the positions of the starting end and terminating end are detected using a two-dimensional laser displacement sensor, then detection is enabled, but the blind spot prevents accurate determination of joining defects such as gaps
Solution Approach 1:
The patent divides the detection task into multiple segments by using different cameras for different viewing angles. The first camera captures the front view of the band-shaped member, the second camera captures the side view including the joint area, and additional cameras capture other perspectives. This segmentation of detection coverage ensures that no blind spots remain, particularly at the critical joint area where joining defects occur.
Data Source
AI summary
A joining state determination method includes: acquiring member front end imaging data of a band-shaped member; acquiring member joint imaging data of the band-shaped member; calculating a matching rate indicating a degree of coincidence of the acquired member joint imaging data with member front end registration data registered based on the acquired member front end imaging data; and determining that the longitudinal ends of the band-shaped member are properly joined, in the case where the calculated matching rate is either not greater than a predetermined threshold or less than the predetermined threshold.