Keyboard Pillow Lifting Mechanism for Fine Stroke Adjustment
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Solution Overview
Problem
Conventional stroke adjustment devices for keyboard instruments lack fine adjustment capabilities for key depression stroke and hammer stroke, resulting in insufficient controllability of weak tones and requiring additional pedals, which increases manufacturing costs and alters the design of instruments like grand pianos.
Innovation Solution
A stroke adjustment device with a keyboard pillow-lifting mechanism, operation mechanism, and driving force transmission mechanism that allows manual adjustment of key depression stroke and hammer stroke by lifting the keyboard pillow, enabling precise control of tone production through rotation of a shaft and movement of rack parts, with a lock mechanism for setting multiple levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional stroke adjustment device with a stroke pedal is used, then the key depression stroke and hammer stroke can be adjusted to two fixed positions, but fine adjustment capability is insufficient and controllability of weak tones is inadequate
Solution Approach 1:
The keyboard pillow is made movable vertically through a lifting mechanism driven by a rotary operation part. This dynamic adjustment system allows continuous variation of the pillow's vertical position, enabling fine control of key depression stroke and hammer stroke, thereby resolving the contradiction between adjustment precision and controllability.
Solution Approach 2:
The invention changes the physical parameter of the keyboard pillow's vertical position continuously through rotational operation, rather than providing only two fixed positions. This parameter change approach enables precise control of stroke length and hammer strength, achieving both high adjustment precision and ease of operation.
2Measurement precision
If additional stroke adjustment pedals are added to achieve fine adjustment capability, then adjustment precision improves, but device complexity and manufacturing costs increase
Solution Approach 1:
The single rotary operation part serves multiple functions: it drives the keyboard pillow lifting mechanism for stroke adjustment, and through the lock mechanism, it can also lock the pillow at various positions. This multi-functionality eliminates the need for separate adjustment devices, maintaining simplicity while achieving fine adjustment precision.
Solution Approach 2:
The lifting mechanism and lock mechanism are integrated within the existing pedal structure. The rotary operation part, lifting mechanism, and lock mechanism form a nested arrangement where components are combined in a space-efficient manner, avoiding additional external pedals and reducing overall device complexity.
3Measurement precision
If additional stroke adjustment pedals are added to improve adjustment precision, then fine control capability is enhanced, but the instrument's design integrity is compromised
Solution Approach 1:
The stroke adjustment function is merged with the existing pedal mechanism. The rotary operation part is integrated into the pedal structure, and the lifting mechanism is combined with the keyboard pillow support structure. This merging approach maintains the instrument's original design integrity while adding fine adjustment precision.
4Measurement precision
If the keyboard pillow is made movable for stroke adjustment, then adjustment precision improves, but device complexity increases
Solution Approach 1:
The complex multi-pedal mechanical adjustment system is replaced with a simplified rotary operation mechanism. The rotary operation part converts rotational motion into vertical lifting motion through the lifting mechanism, providing precise control with fewer components and reduced mechanical complexity.
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
Enables fine adjustment of key depression stroke and hammer stroke, providing sufficient controllability of weak tones and expanding the dynamic range, while maintaining the instrument's design integrity without the need for additional pedals.
Implementation Method 1
a plurality of gear portions provided on the rotating shaft at respective predetermined locations in a longitudinal direction of the rotating shaft and configured to rotate in unison with the rotating shaft, a plurality of rack parts that are in mesh with the respective gear portions and are vertically movable
Data Source
AI summary
A stroke adjustment device for a keyboard instrument, which can finely adjust key depression stroke and hammer stroke to obtain sufficient controllability of weak tones during musical performance and make the dynamic range even wider. This device includes a lifting mechanism for lifting up and down a keyboard pillow on which rear ends of keys are placed, an operation mechanism manually operated for driving the lifting mechanism, and a driving force transmission mechanism for transmitting a driving force generated by operation of the operation mechanism to the lifting mechanism. The lifting mechanism has a rotating shaft body rotatably provided below the keyboard pillow, vertically movable rack parts in mesh with gear portions that rotate in unison with the rotating shaft, and a lifting part extending over the rack parts and vertically moving in unison with the rack parts to lift up and down the keyboard pillow.