Electronic Keyboard Hammer Height Regulation via Synthetic Resin Parts
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Solution Overview
Problem
Conventional electronic keyboard instruments face challenges in maintaining uniform hammer positions and pivoting characteristics due to variations in key thickness, requiring complex capstan screw adjustments and risking lubricant spillage, which affects friction and noise.
Innovation Solution
The implementation of a keyboard device with hammer contact height-regulating parts made of synthetic resin, which maintain uniform key heights and eliminate the need for capstan screws, and a lubricant-blocking portion on the hammer body to prevent lubricant spillage, ensuring consistent pivoting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If capstan screws are used to adjust hammer positions, then uniform hammer positions can be achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the capstan screw adjustment mechanism from the hammer device. Instead of using capstan screws to adjust hammer positions, the patent uses a molded article structure where the hammer is directly integrated with the key mechanism, removing the need for separate adjustment components while maintaining manufacturing precision
Solution Approach 2:
The invention merges the hammer body and key structure into a single integrated molded article. The hammer and key are formed as one piece through injection molding, combining functions that were previously separate components (hammer, key, and adjustment mechanism) into a unified structure, thereby simplifying the device while maintaining precision
2Manufacturing precision
If capstan screws are used for height adjustment, then key thickness variations can be compensated, but ease of manufacture deteriorates
Solution Approach 1:
The molded article structure is designed to automatically compensate for key thickness variations through its integrated geometry. The hammer and key are formed as one piece with built-in alignment features that self-adjust to accommodate manufacturing tolerances, eliminating the need for manual capstan screw adjustments during assembly
Solution Approach 2:
The invention replaces the mechanical capstan screw adjustment system with a molded structural solution. Instead of using threaded mechanical components for height adjustment, the patent uses precision molded features that provide the same function through the molding process itself, greatly simplifying the assembly process
3Ease of operation
If lubricant is applied to hammer pivot, then pivoting smoothness is improved, but harmful factors increase due to lubricant spillage
Solution Approach 1:
The invention extracts and removes the lubricant application from the hammer pivot mechanism. By eliminating the need for separate lubricant application and maintenance, the patent prevents lubricant spillage while maintaining pivoting smoothness through the molded article's inherent low-friction surfaces and precise fit tolerances
Data Source
AI summary
A keyboard device for an electronic keyboard instrument, making uniform an upper surface height of the rear end of each key in contact with a hammer in a key-released state. The keyboard device includes longitudinally extending wooden keys capable of swinging and laterally juxtaposed, a hammer support disposed rearward of the keys, longitudinally extending hammers having a rear end thereof supported by the hammer support vertically pivotally movably and a protrusion protruding downward from a lower surface thereof for contact with a rear end of an associated key, and hammer contact height-regulating parts each made of a synthetic resin and mounted on the rear end of each key, the part being in contact with the protrusion in the key-released state, to regulate a contact height of the protrusion to a predetermined height.