Tracking Apparatus Slip Correction Boundary Sensors
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Solution Overview
Problem
Conventional tracking apparatuses face challenges in maintaining tracking accuracy across multiple conveyance tables, particularly when slips occur, leading to errors that accumulate and decrease accuracy, especially in long-distance conveyance scenarios.
Innovation Solution
A tracking apparatus equipped with sensors at boundary positions, speed standard setting, chattering removal, time delay correction, slip judgment, and correction means to adjust tracking positions based on sensor detection, ensuring accurate alignment and synchronization of head and tail end tracking even during slips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tracking corrections are performed by calculating slip amount based on conveyance table acceleration and deceleration, then tracking adjustments can be made, but tracking errors accumulate and accuracy decreases over long conveyance distances
Solution Approach 1:
The patent divides the conveyance system into multiple conveyance tables (first, second, third conveyance tables) with sensors positioned at their boundaries. Each sensor independently detects material presence at specific locations, segmenting the tracking verification into discrete checkpoints rather than relying on continuous calculation over the entire conveyance path. This segmentation prevents error accumulation by providing localized verification points.
Solution Approach 2:
The patent implements feedback by using sensors to detect the actual presence of conveyed material at boundary positions and comparing this with the calculated tracking position. When a discrepancy is detected (indicating slip), the system generates correction signals to adjust the tracking position. This closed-loop feedback mechanism corrects accumulated errors rather than allowing them to propagate over long distances.
2Reliability
If sensors are placed at boundary positions to detect material presence, then slip detection capability is improved, but system complexity increases due to multiple sensors and signal processing requirements
Solution Approach 1:
The patent places sensors at specific boundary positions between conveyance tables, segmenting the monitoring function into discrete locations rather than requiring continuous monitoring. Each sensor has a dedicated detection function, and the control unit processes signals from each sensor independently based on its specific location, reducing the complexity of signal integration while maintaining reliable slip detection.
Solution Approach 2:
The patent assigns different functional roles to sensors based on their local positions - sensors at different boundaries detect different aspects of material conveyance. The control unit applies location-specific logic to each sensor signal, tailoring the detection and correction approach to the local conveyance conditions at each boundary, thereby improving reliability without requiring a uniform complex system throughout.
Data Source
AI summary
A tracking apparatus which can ensure good-accuracy coincidence between a conveyed material and a tracked position thereof, even when slip occurs in the conveyed material moving across conveyance tables. A sensor is located at a boundary position of a conveyance table, of conveyance tables arranged adjacent to each other, to detect the presence or absence of a conveyed material. Head and tail end tracking data of the conveyed material is generated, and positions of head and tail ends are calculated using conveyance speed of a selected conveyance table as a speed standard. Then, occurrence or nonoccurrence of slip of the conveyed material is determined from the detection signal of the sensor and the positions of head and tail ends. When slip has occurred, head and tail end tracking data generation is stopped. Head and tail end tracking data generation is restarted considering a time delay due to removal of chattering from the detection signal.