Spool Brake Device Using Rotational Acceleration Prediction
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Solution Overview
Problem
Existing spool brake devices for fishing reels face challenges in accurately detecting the maximum rotational velocity of the spool, leading to instability and difficulty in appropriate braking, which results in inadequate prevention of backlash.
Innovation Solution
A spool brake device that includes a velocity detector, a spool controller with an acceleration generator, an acceleration determiner, and a brake time predictor, which uses rotational acceleration data to set a prediction starting time and predict a brake starting time for reliable spool braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotational velocity detection is used to determine braking timing, then the system structure remains simple, but the maximum velocity detection becomes inaccurate due to instability in the velocity range around the maximum value
Solution Approach 1:
The patent changes the detection parameter from rotational velocity to rotational acceleration. By detecting the maximum value of rotational acceleration and using it to determine braking timing, the system avoids the instability issue inherent in velocity detection around the maximum velocity point. This parameter transformation resolves the contradiction by achieving accurate timing detection without requiring complex additional systems.
2Reliability
If braking is initiated based on maximum velocity detection, then the braking response is delayed due to detection instability, but early braking reduces casting efficiency
Solution Approach 1:
The patent replaces the velocity-based control mechanism with an acceleration-based control mechanism. By substituting the detection of rotational velocity with detection of rotational acceleration, the system achieves more reliable timing determination. The maximum acceleration point provides a clear, stable signal for triggering the braking sequence, ensuring reliable backlash prevention while maintaining optimal casting efficiency.
3Ease of operation
If gradual braking force increase is used to prevent backlash, then the braking process becomes smooth and effective, but the braking start timing must be precisely controlled
Solution Approach 1:
The patent implements preliminary detection and prediction of the maximum acceleration timing. By detecting the maximum rotational acceleration in advance and predicting the corresponding brake starting time, the system prepares for braking before the optimal moment arrives. This preliminary action enables precise timing control for the gradual braking force increase, ensuring both smooth operation and effective backlash prevention.
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
The device effectively brakes the spool using rotational acceleration, ensuring appropriate braking and reliable initiation of the braking process, improving upon traditional methods that rely solely on rotational velocity detection.
Implementation Method 1
The velocity detector detects a rotational velocity of a spool
Implementation Method 2
The accelerator generator generates time-series data of a rotational acceleration based on the rotational velocity of the spool
Implementation Method 3
The spool brake includes a magnet mounted to a spool and one or more coils mounted to a reel unit... the spool brake brakes the spool such that a braking force acting thereon gradually increases
Data Source
AI summary
A spool brake device for a fishing reel includes a velocity detector, a spool controller and a spool brake. The velocity detector is configured to detect a rotational velocity of a spool. The spool controller includes an acceleration generator, an acceleration determiner and a brake time predictor. The accelerator generator is configured to generate time-series data of a rotational acceleration based on the rotational velocity. The acceleration determiner is configured to determine whether the rotational acceleration has satisfied a predetermined condition based on the time-series data of the rotational acceleration. The brake time predictor is configured to set a prediction starting time based on a point of time at which the rotational acceleration has satisfied the predetermined condition and to predict a brake starting time of the spool based on the prediction starting time. The spool brake is configured to start braking the spool at the brake starting time.