Record Player Tonearm Auto-Stop Assembly with Position Sensor
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Solution Overview
Problem
Existing record players lack an automatic mechanism to lift the tone arm and stop the turntable after a vinyl record has finished playing, leading to unnecessary power consumption and potential damage to the stylus due to continued rotation.
Innovation Solution
An electric arm lifting and turntable auto-stop assembly that includes a power-driven turntable, a movable arm, a lift mechanism, and a sensor system, where the lift mechanism is activated by a microcontroller to lift the arm and stop the turntable when the sensor detects the arm has reached a predetermined position, protecting the stylus and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turntable continues to rotate after the record has finished playing, then the power consumption increases and the stylus may be damaged, but without an automatic stopping mechanism, the system remains simple and reliable
Solution Approach 1:
The patent applies preliminary action by detecting when the record has finished playing (when the groove ends) and automatically initiating the arm lifting sequence before the user can manually intervene. The sensor detects the end of the record and triggers the microcontroller to activate the lifting motor, which raises the tonearm and simultaneously stops the turntable rotation, preventing stylus damage and power waste
Solution Approach 2:
The patent implements feedback through a sensor system that continuously monitors the position of the tonearm and the rotation state of the turntable. The sensor detects when the arm reaches the lift point and sends signals to the microcontroller, which then controls the lifting mechanism and turntable stop functions, creating a closed-loop control system that ensures proper operation
2Reliability
If an automatic sensor-based lifting mechanism is implemented, then the stylus protection and power savings are achieved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by designing a system that automatically performs the arm lifting and turntable stopping functions without requiring user intervention. The sensor detects the end of the record, the microcontroller processes the signal, and the lifting motor automatically raises the tonearm while the turntable stops, making the system self-regulating and eliminating the need for manual operation
Solution Approach 2:
The patent implements multi-functionality by integrating multiple functions into a single automated system: the sensor serves both to detect arm position and trigger the lifting sequence, the microcontroller manages both the lifting motor and turntable stop functions, and the lifting mechanism simultaneously raises the arm and stops the turntable, reducing the need for separate dedicated components
Data Source
AI summary
An electric arm lifting and turntable's auto-stop assembly of a record player is revealed. A record player is disposed with a power-driven turntable, a rotatable and movable arm disposed on one side of the turntable, a lift mechanism used for pushing against and moving the arm upward, and a sensor. The arm is moveable over the turntable. The sensor is arranged at an arm rotating shaft of the arm and used for sending a signal while detecting that the arm is moved to a lift point over the turntable. The lift mechanism is activated to move the arm upward and the turntable is stopped simultaneously for protecting a needle on the arm while the sensor detects that the arm has been moved from the turntable to the lift point.