Electronic Piano Key Switch Mounting Structure for Accurate Let-Off
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Solution Overview
Problem
Conventional electronic piano keyboard devices face challenges in accurately mounting and dismounting key switches and hammers, leading to inconsistent let-off feelings due to dimensional errors and inaccurate positioning of let-off members, which affects the touch sensation similarity to acoustic grand pianos.
Innovation Solution
The keyboard device features a hammer support made of synthetic resin with a switch mounting part above the hammers, allowing for remounting of the key switch from above and precise positioning of let-off members directly on the hammer support, ensuring accurate installation and stable let-off feeling across all keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the key switch is mounted to the lower side of the switch mounting part of the action chassis with screws via a spacer, then the key switch is securely fixed, but the mounting and dismounting work becomes troublesome and time-consuming
Solution Approach 1:
The key switch mounting structure is segmented into a key switch unit that can be independently removed. The key switch is detached from the action chassis as a separate assembly, allowing quick removal without affecting other components. This segmentation enables maintenance personnel to efficiently remove and reinstall key switches without complex disassembly procedures.
Solution Approach 2:
The key switch is extracted from the traditional screwed mounting configuration and repositioned to be directly removable from the action chassis. By taking out the key switch from its conventional mounted position and reconfiguring its attachment mechanism, the patent enables simple plug-and-play style removal and installation, dramatically reducing mounting and dismounting time while maintaining secure operation during use.
2Reliability
If the key switch is securely mounted with screws via a spacer, then the key switch position is fixed, but positioning accuracy of switch bodies relative to hammers is compromised due to dimensional errors in the spacer
Solution Approach 1:
An intermediary mounting structure is introduced between the action chassis and the key switch. This intermediary mechanism provides precise positioning references that eliminate dependence on spacer dimensional accuracy. The intermediary structure includes positioning features that directly reference the hammer positions, ensuring accurate alignment of switch bodies with hammers regardless of manufacturing tolerances in mounting components.
3Reliability
If the let-off members are mounted to the holder extending in the left-right direction and fixed to the action chassis with screws, then the let-off members are securely positioned, but accurate positioning relative to hammers is difficult to achieve
Solution Approach 1:
The mounting structures for the key switch and let-off members are merged into a unified positioning system on the action chassis. This combined mounting approach uses common reference features and coordinated positioning mechanisms, ensuring that both the key switch and let-off members are accurately positioned relative to the hammers simultaneously. The merged structure eliminates the need for separate, independent mounting procedures that previously caused positioning inaccuracies.
Data Source
AI summary
A keyboard device for an electronic keyboard instrument, which enables facilitation of work for mounting and dismounting a key switch and install hammers and the key switch with high accuracy, and provision of a touch feeling similar to one provided by an acoustic grand piano while keeping the device compact in depth. The device comprises swingable keys, a hammer support formed by a synthetic resin molded article, hammers pivotally supported by the hammer support, and a key switch including switch bodies provided in association with the hammers and a switch board. The hammer support has a switch mounting part formed with an opening vertically extending therethrough. The key switch is removably mounted to the switch mounting part, with the switch bodies facing the hammers from above via the opening and the switch board placed on the upper surface of the switch mounting part.