Line-Winding Device Tension Detection Without Line Bending
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Solution Overview
Problem
Existing line-winding devices, such as fishing reels, face challenges in accurately detecting tension without bending the line path, which complicates miniaturization and leads to inaccurate tension measurement, especially when the device is stopped or under external forces.
Innovation Solution
A line-winding device incorporating a spool, a support shaft, a restoring force generation unit, and a detection unit that measures rotational movement and fishing line diameter to calculate tension without bending the line path, utilizing a non-contact detection mechanism like magnetic or optical sensors to ensure accurate and compact tension detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide part such as a pulley is used to bend the fishing line for tension detection, then the tension can be detected, but the device size increases and resistance occurs during high-speed line feeding
Solution Approach 1:
The patent extracts the tension detection function from the mechanical line path by using a sensor that detects tension through magnetic field interaction with a detection weight, eliminating the need for guide parts like pulleys that bend the line. This allows tension detection without adding mechanical complexity or resistance to line feeding.
Solution Approach 2:
The patent replaces the mechanical bending system (guide parts, pulleys) with a magnetic field-based detection system. A detection weight with magnetic properties interacts with a magnetic sensor to detect tension, substituting mechanical line path manipulation with a non-contact magnetic detection method that reduces device complexity and line resistance.
2Reliability
If the rotating body is displaced by external forces, then the detection mechanism responds, but accurate tension detection becomes difficult
Solution Approach 1:
The patent employs feedback control where the detection weight's position, detected by the magnetic sensor, provides information about tension forces. The system can distinguish between displacement caused by line tension versus other external forces on the reel body, as the detection weight responds specifically to forces transmitted through the line to the spool, enabling accurate tension measurement despite external disturbances.
Solution Approach 2:
The detection weight acts as an intermediary between the line tension and the magnetic sensor. It is specifically coupled to the spool rotation, so it responds to tension forces transmitted through the line while being isolated from other external forces acting on the reel body, thereby enabling selective and accurate tension detection.
3Device complexity
If non-contact detection mechanism is used, then device size is reduced and line path bending is eliminated, but detection accuracy at stopping must be maintained
Solution Approach 1:
The patent uses a magnetic field-based detection system where a magnetic sensor detects the position of a magnetically property-equipped detection weight. This non-contact mechanism eliminates mechanical friction and wear, maintaining high detection accuracy even when the reel is stationary, while keeping the device compact without requiring mechanical guide parts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy tension measurement even at stopping without bending the line path, allowing for downsized and efficient operation, reducing resistance during high-speed line feeding and avoiding external disturbance effects.
Implementation Method 1
utilizing a non-contact detection mechanism like magnetic or optical sensors
Implementation Method 2
utilizing a non-contact detection mechanism like magnetic or optical sensors
Implementation Method 3
a restoring force generation unit for generating a restoring force between the support shaft portion and the spool
Data Source
AI summary
A line-winding device including a tension detection unit that can be incorporated in a reel, can be downsized, and can measure a tension with high accuracy even at the time of stopping without the need to bend a line path. A line-winding device is configured to include: a spool capable of winding a fishing line; an operating part for winding the fishing line around the spool; a support shaft portion for rotatably supporting the spool; a restoring force generation unit for generating a restoring force between the support shaft portion and the spool; a restricting part for restricting a rotational movement amount of the spool; and a detection unit for detecting the rotational movement amount of the spool.