Cylindrical Member Widthwise Misalignment Detection
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Solution Overview
Problem
Existing methods for assessing widthwise misalignment in cylindrical members molded from strip-shaped members are inadequate, leading to inconsistent tire quality due to strain in the width direction of the drum during tire manufacturing.
Innovation Solution
A device and method utilizing a position sensor and control unit to detect and calculate the degree of widthwise misalignment by comparing the positions of the strip-shaped member's ends with respect to the molding drum's end faces, determining if the misalignment is within an allowable range, and assessing the appropriateness of the spliced state through thickness measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strip-shaped members are wound around the molding drum in a meandering manner or offset, then the manufacturing process is simpler and faster, but widthwise misalignment occurs causing strain in the cylindrical member
Solution Approach 1:
The patent applies preliminary action by measuring the widthwise position of the strip-shaped member at multiple points along its length before the winding process completes. The control unit calculates the degree of widthwise misalignment based on these preliminary measurements, allowing the system to assess alignment accuracy before the cylindrical member is fully formed, thus preventing strain issues while maintaining efficient winding speeds
Solution Approach 2:
The patent replaces mechanical alignment control with an optical/electronic measurement system. Instead of relying on mechanical guides or fixtures to maintain alignment, the system uses sensors to detect the widthwise position of the strip-shaped member and electronically calculates misalignment, enabling faster winding speeds without sacrificing precision
2Measurement precision
If the width position of the strip-shaped member is measured along the whole length, then the widthwise misalignment can be accurately assessed, but the inspection time and complexity increase
Solution Approach 1:
The patent applies partial action by measuring the widthwise position at multiple discrete points along the length of the strip-shaped member rather than continuously along the entire length. The control unit calculates misalignment based on these sampled measurements, achieving sufficient measurement precision while reducing inspection time and complexity compared to continuous measurement
Data Source
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AI summary
Provided are a device and a method for inspecting a cylindrical member, whereby it is possible to accurately assess a widthwise misalignment of a cylindrical member obtained by molding a strip-shaped member into a cylindrical shape. During inspection of a cylindrical member (9a) obtained by winding a strip-shaped member (8a) around a molding drum (5), placing a longitudinal distal end (E1) and a longitudinal rear end (E2) of the strip-shaped member (8a) against each other and molding the strip-shaped member (8a) into a cylindrical shape, a drum-widthwise end position (L1) of the strip-shaped member (8a) wound around the molding drum (5) is detected by a position sensor (2) along the entire length of the strip-shaped member (8a) in the longitudinal direction thereof, a degree of widthwise misalignment of the strip-shaped member (8a) wound around the molding drum (5) is calculated by a control unit (4) on the basis of detection data from the position sensor (2) and position data of drum-widthwise end faces (DL) that are perpendicular to a drum axial center (DX) of the molding drum (5), and the widthwise misalignment of the strip-shaped member (8a) is determined to be inside or outside an allowable range on the basis of the calculation result.