Keyboard Link Mechanism With Counterweight for Grand Piano Feel
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Solution Overview
Problem
Existing keyboard instruments lack a mechanism that accurately replicates the dynamic properties and balanced operation of grand piano keys, particularly in terms of key movement and weight distribution, which affects the playing feel and overall performance.
Innovation Solution
A keyboard instrument with a link mechanism featuring a first and second link pivotally supported on fixing fulcrums, a coupling link maintaining a fixed distance between their ends, and a counterweight positioned forward of the second fulcrum, which balances weight distribution and mimics grand piano dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a link mechanism with fixed distance coupling is used to replicate grand piano key movement, then key movement accuracy and dynamic properties are improved, but device complexity increases
Solution Approach 1:
The key mechanism is divided into multiple links (first link, second link, coupling link) with specific fulcrums and pivot points. Each link performs a specific function in the movement sequence, allowing precise replication of grand piano key dynamics through modular mechanical segments rather than a single complex component.
Solution Approach 2:
The coupling link acts as an intermediary element that maintains a fixed distance between the first and second links while allowing their relative movement. This intermediary structure enables precise motion transmission and maintains the geometric relationship necessary for authentic key action without requiring direct rigid connection between all components.
2Ease of operation
If a counterweight is added to balance key operation, then playing feel and weight distribution are improved, but device complexity increases
Solution Approach 1:
A counterweight is introduced into the link mechanism to compensate for the weight distribution of the hammer and key assembly. The counterweight is positioned at a specific location on the second link to create balancing moments that replicate the natural weight distribution of grand piano keys, improving playability and reducing the need for additional balancing mechanisms.
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 mechanism provides a balanced key operation and dynamic feel similar to a grand piano, allowing for precise key movement and efficient use of space within the instrument.
Implementation Method 1
a counterweight provided further forwards than the second fixing fulcrum
Implementation Method 2
a first link pivotally supported on the first fixing fulcrum on one end side thereof, a second link pivotally supported on the second fixing fulcrum on one end side thereof
Data Source
AI summary
A keyboard instrument having a key and a link mechanism provided on a lower side of the key, and the link mechanism has a first member having a first fixing fulcrum, a first link pivotally supported on the first fixing fulcrum on one end side, a second member having a second fixing fulcrum provided further forwards and further downwards than the first fixing fulcrum, a second link pivotally supported on the second fixing fulcrum on one end side and a coupling link configured such that a distance between the other end side of the first link rotating about the first fixing fulcrum in response to a key operation and the other end side of the second link rotating about the second fixing fulcrum in response to the key operation is fixed and remains unchanged, and the second link has a counterweight provided further forwards than the second fixing fulcrum.