Sealing Tool Misalignment Detection Using Token Sensors
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Solution Overview
Problem
Packaging machines with sealing tools struggle to reliably detect tool misalignments, especially when products protrude above the tray rim, as conventional cameras and sensors fail to distinguish between the product and foreign objects, leading to potential damage during the sealing process.
Innovation Solution
The implementation of at least two tokens detectable by sensors in specific operating positions of the sealing tool, allowing for the measurement of time differences or elapsed times between signal losses to determine tool misalignments, which enables accurate detection even when products protrude above the tray edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cameras or sensors for measuring film tension are used to detect foreign objects, then foreign object detection capability is improved, but the system cannot reliably distinguish between protruding products and foreign objects when products extend above the tray rim
Solution Approach 1:
The detection system is segmented into multiple sensors positioned at different locations (first sensor and second sensor at different horizontal positions). Each sensor monitors a specific zone, and the combination of signals from multiple sensors enables precise object identification. This segmentation allows the system to distinguish between protruding products (which may trigger one sensor but not both simultaneously in specific patterns) and foreign objects (which trigger specific sensor combinations), resolving the ambiguity problem.
2Reliability
If conventional sensors are used to detect tool misalignment, then detection capability is insufficient, but the patent implements multiple tokens with sensors to achieve reliable detection
Solution Approach 1:
Tokens are introduced as intermediary elements attached to the sealing tool. These tokens serve as mediators between the sealing tool and the sensors, enabling indirect detection of tool position and alignment. The tokens carry specific signals that sensors can detect, allowing the system to infer tool misalignment from token position changes. This intermediary approach simplifies the overall detection mechanism while maintaining high reliability.
Solution Approach 2:
The patent replaces complex mechanical alignment detection mechanisms with an optical/electronic sensor-based system. Instead of using mechanical gauges or physical alignment indicators, the system uses sensors to detect tokens optically or electromagnetically. This substitution reduces mechanical complexity while improving detection precision and reliability.
3Productivity
If the sealing tool operates without misalignment detection, then operational speed is maintained, but potential damage to packaging, goods, or sealing tool occurs
Solution Approach 1:
The system performs preliminary detection of tool alignment using multiple sensors and tokens before the sealing operation commences. The control unit evaluates sensor signals in advance to determine if misalignment exists, and only permits the sealing cycle to proceed when alignment is confirmed. This preliminary action prevents misalignment-related damage while maintaining continuous operation speed, as properly aligned tools can seal without interruption.
Solution Approach 2:
The system implements a feedback mechanism where sensors continuously monitor token positions during the sealing cycle. If misalignment is detected at any stage, the control unit receives feedback and can immediately halt the operation to prevent damage. This real-time feedback loop ensures that productivity is maintained through continuous operation when aligned, while damage prevention is activated automatically when misalignment occurs.
Data Source
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AI summary
A method for detecting a tool misalignment of a sealing tool (10) arranged in a packaging machine (1), wherein at least two tokens (19a, 19b) are arranged on the sealing tool (10) such that their respective presence in a first operating position of the sealing tool (10) can be detected by corresponding sensors (20a, 20b) of the packaging machine (1) and cannot be detected in a second operating position, comprising detecting a first signal from a first of the at least two sensors (20a, 20b) indicating the presence of a first of the at least two tokens (19a, 19b), detecting a second signal from a second of the at least two sensors (20a, 20b) indicating the presence of a second of the at least two tokens (19a, 19b), monitoring the first and second signals, and detecting a first signal loss of one of the first and second signals and/or the other of the first and second signals.Determining a tool misalignment based on the time difference between the two signal losses or based on the time elapsed after the first signal loss.