Tonearm Lifter Mechanism Compact Design
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Solution Overview
Problem
Existing tonearm devices have a large electric motor for the lifter mechanism, which increases the size of the device and cannot be stored within the arm base, leading to a larger tonearm device configuration.
Innovation Solution
A tonearm device with a lifter mechanism that includes a first and second lifter, biasing members, a locking lever, and a queueing lever, allowing for upward and downward movement of the arm without the need for a large external motor, enabling a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large electric motor is used for the lifter mechanism, then the lifting function is reliable, but the device size increases and cannot be integrated within the arm base
Solution Approach 1:
The patent replaces the electric motor-driven mechanical system with a purely mechanical lifter mechanism consisting of linkages, levers, and springs. This substitution eliminates the need for a large electric motor while maintaining the lifting function through mechanical advantage and elastic energy storage in springs, thereby reducing the overall device volume and enabling integration within the arm base.
Solution Approach 2:
The lifter mechanism utilizes springs to automatically return the tonearm to its initial position after playback, eliminating the need for continuous power input. The mechanical linkages and levers work together to provide automatic lifting and positioning functions, reducing dependency on external power sources and large motors.
2Volume of moving object
If the lifter mechanism is downsized for compact integration, then the device volume is reduced, but the complexity of the mechanical structure increases
Solution Approach 1:
The lifter mechanism is divided into multiple functional components including linkages, levers, springs, and locking mechanisms. Each component performs a specific function, allowing the complex overall function to be achieved through simpler, modular elements that can be integrated within a compact space while maintaining manageability.
Solution Approach 2:
The patent employs a nested arrangement where the locking lever is disposed within the linkage structure, and various components are integrated within each other to maximize space utilization. This nesting approach allows the compact integration of multiple functional elements without proportionally increasing the external dimensions of the device.
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 lifter mechanism is downsized, allowing for a more compact tonearm device that can be integrated within the arm base, improving the device's overall size efficiency.
Implementation Method 1
a first biasing member that biases the second lifter from the second lower limit position toward the second upper limit position
Implementation Method 2
a second biasing member that biases the locking lever from the locked position toward the released position
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A lifter mechanism (16) includes: a first lifter (44) that supports an arm (24) from below and is raised and lowered between a first lower limit position and a first upper limit position; a second lifter (48) that supports the first lifter (44) from below and is raised and lowered between a second lower limit position and a second upper limit position; a first biasing member (50) that biases the second lifter (48) from the second lower limit position toward the second upper limit position; a locking lever (54) that is displaced between a locked position in which the locking lever (54) locks the second lifter (48) in the second lower limit position and a released position in which the locking lever (54) releases the lock of the second lifter (48) from the second lower limit position; a second biasing member (56) that biases the locking lever (54) from the locked position toward the released position; a holding member (58) that holds the locking lever (54) in the locked position; and a queueing lever (52) that pushes down the second lifter (48) from the second upper limit position to the second lower limit position.