Electronic Keyboard Hammer Mounting Grease Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hammer devices for electronic keyboards face issues such as grease adhesion during mounting, interference with balance pins, and insufficient dynamic load, leading to noise and hindered dismounting, as well as a light touch feeling due to suboptimal weight distribution.
Innovation Solution
The design includes partition walls and stoppers to prevent actuator portion contact with the fulcrum shaft during mounting, a weight configuration that avoids balance pin interference, and a lever ratio of 5:1 to 6:1 for enhanced dynamic load and response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the actuator portion is brought close to the fulcrum shaft portion during hammer mounting, then the mounting process is simplified, but grease adheres to the actuator portion causing noise and contamination
Solution Approach 1:
The hammer is divided into functionally distinct segments: the actuator portion for key switch operation and the engaging portion for fulcrum shaft engagement. This segmentation allows the actuator portion to be positioned away from the fulcrum shaft during mounting, preventing grease adhesion while maintaining mounting simplicity through the dedicated engaging portion.
Solution Approach 2:
The engaging portion acts as an intermediary element between the hammer and fulcrum shaft. It provides a dedicated interface for mounting operations, allowing the hammer to be securely attached without the actuator portion contacting the grease-coated fulcrum shaft, thus eliminating the harmful grease adhesion effect.
2Length of moving object
If the balance pin is positioned close to the front end of the hammer, then the key front portion length is increased for better touch feeling, but the hammer interferes with the balance pin during pivotal motion
Solution Approach 1:
The hammer design incorporates local quality differentiation by positioning the weight at the front end while maintaining sufficient clearance between the hammer body and balance pin. This allows the key front portion to be extended for improved touch feeling while the localized weight placement ensures the hammer does not interfere with balance pin operation during pivotal motion.
3Weight of moving object
If the weight is positioned closer to the fulcrum to increase dynamic load, then the touch feeling is improved, but the lever ratio becomes suboptimal reducing hammer response
Solution Approach 1:
The hammer design optimizes the lever ratio by carefully positioning the weight at a specific distance from the fulcrum (5:1 to 6:1 ratio). This parameter optimization simultaneously achieves sufficient dynamic load for improved touch feeling and maintains adequate hammer response speed, resolving the contradiction between these two performance requirements.
Data Source
AI summary
A hammer device for an electronic keyboard instrument, enabling prevention of grease or the like from adhering to an actuator portion during mounting of the hammer, to thereby enable speedy hammer mounting work and improve the work efficiency. The hammer device includes a hammer support and hammers arranged side by side in a left-right direction and each pivotally supported by the hammer support to pivotally move in accordance with depression of an associated key. When mounting the hammer to the hammer support, before a shaft hole is engaged with a fulcrum shaft portion, left and right protrusions of the hammer are brought into abutment with respective left and right stopper walls provided close to the respective left and right ends of the fulcrum shaft portion, to thereby prevent the actuator portion from being brought into contact with the fulcrum shaft portion.