Keyboard Hammer Weight Layout for Key Stroke Tuning and Noise Control
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Solution Overview
Problem
Conventional hammer devices for keyboard instruments face challenges in adjusting key stroke and touch weight on a key-by-key basis, leading to potential noise generation due to large contact areas with stoppers.
Innovation Solution
A hammer device with a hammer body and two weights, where the first weight has a stopper contact portion protruding more upward or downward than the second weight, allowing for adjustable key stroke and touch weight, and reducing noise by minimizing contact area with stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hammer device uses common weight and adjustment weight with equal heights, then the key stroke can be standardized, but the key stroke cannot be adjusted on a key-by-key basis
Solution Approach 1:
The patent applies asymmetry by making the first weight taller than the second weight in the vertical direction. This height difference allows the first weight to contact the upper stopper while the second weight contacts the lower stopper, enabling independent adjustment of key stroke for each key without increasing overall device complexity
Solution Approach 2:
The patent applies local quality by assigning different heights to different weights (first weight taller than second weight) so that each weight can independently interact with its respective stopper. This localized differentiation enables key-by-key adjustment of key stroke while maintaining a relatively simple overall structure
2Object-affected harmful factors
If both weights are brought into contact with stoppers during hammer pivotal movement, then the hammer can be restrained, but noise is generated due to large contact areas
Solution Approach 1:
The patent segments the weight structure into two distinct weights with different heights, allowing each to contact different stoppers (upper and lower). This segmentation reduces the contact area between weights and stoppers, thereby suppressing noise while maintaining effective restraint of hammer movement
Solution Approach 2:
The patent introduces a vertical dimension differentiation between the two weights (first weight taller than second weight), enabling them to engage with stoppers at different heights. This dimensional change reduces horizontal contact areas and minimizes noise generation while preserving restraint functionality
Data Source
AI summary
A hammer device for a keyboard instrument includes a plurality of hammers. Each hammer has a hammer body extending in a front-rear direction and having a front half thereof pivotally supported and a rear half thereof formed with a weight mounting portion. A first weight common in shape and size to the hammers is attached to one of left and right side surfaces of the weight mounting portion. A second weight is attached to the other of the left and right side surfaces of the weight mounting portion. The first weight includes a stopper contact portion which protrudes at least either more upward or more downward than the second weight, and is brought into contact with a stopper in accordance with pivotal movement of the hammer caused by depression of a key associated therewith.