Snare Drum Strainer Cam Mechanism for Noise Reduction
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Solution Overview
Problem
Conventional snare drum strainers produce loud contact noise when switching snare wires between ON and OFF positions due to uneven movement speed and distance, leading to potential damage in musical performances.
Innovation Solution
A strainer design with a cam mechanism that linearly changes the movement distance of snare wires relative to the operation angle of the operating lever, reducing the likelihood of snare wires hitting the drumhead and incorporating a locking mechanism to maintain the ON position, along with a position adjustment mechanism for fine-tuning contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the operating lever is operated slowly to reduce contact noise, then the contact noise is reduced, but the snare wires still hit the drumhead due to high movement speed from the mechanism design
Solution Approach 1:
The cam groove is designed with a specific curved profile that changes the relationship between the operating lever's rotation angle and the cam follower's linear displacement. This parameter change in the mechanical transmission ratio ensures that the snare wires move at a controlled, reduced speed throughout the switching stroke, preventing impact with the drumhead even during normal-speed operation.
Solution Approach 2:
The cam groove employs a curved (circular arc) profile instead of a linear or simple geometric shape. This curvature allows the mechanism to transform the operating lever's rotational motion into a controlled linear motion of the cam follower, achieving a more uniform and slower movement speed of the snare wires during the switching process, thereby eliminating impact noise.
2Device complexity
If the cam groove has a standard geometric shape, then the structure is simple, but the movement distance of snare wires is uneven relative to operating lever angle
Solution Approach 1:
The cam groove is designed with a specific curved profile where the radius and curvature are carefully calculated to achieve a linear relationship between the operating lever's rotation angle and the cam follower's displacement. This parameter optimization allows the mechanism to provide uniform movement distance control without requiring complex multi-component structures.
3Adaptability or versatility
If the snare wires are positioned high immediately after switching to ON position, then the position adjustment is flexible, but the snare wires hit the drumhead producing loud contact noise
Solution Approach 1:
The cam groove's curved profile is designed to limit the maximum displacement of the cam follower, thereby controlling the maximum height to which the snare wires are raised during switching. This parameter control ensures that the snare wires approach the drumhead gently without impacting it, eliminating contact noise while still allowing position adjustment through the locking mechanism.
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 solution significantly reduces contact noise during snare wire switching, enhances the snare drum's performance by minimizing unwanted noise, and simplifies the strainer's structure, reducing manufacturing costs and maintaining resonance.
Implementation Method 1
a cam (12) which is pivotably supported to the strainer body (14) and has a cam surface (12e) contacting the cam follower (30), the cam (12) being pivoted by operation of the operating lever (13)
Data Source
AI summary
A strainer includes a strainer body, a slider to which a cam follower is fixed, a holder to which snare wires are fixed, an operating lever, and a cam that is pivoted through operation of the operating lever. The slider is slid relative to the strainer body by pivoting the cam through operation of the operating lever so that the cam follower moves along the cam surface. The movement distance of the slider linearly changes with respect to an operation angle of the operating lever.