Keyboard Device Interlock Control for Double Strike Prevention
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Solution Overview
Problem
Existing keyboard devices for instruments like pianos have complex braking mechanisms that increase instrument size and manufacturing complexity, requiring accurate motion timing to prevent double strikes on strings.
Innovation Solution
A keyboard device with a simplified structure featuring interlock control sections that use a guide section and interlock projecting section to control the motion of hammer members, preventing unnecessary motion and reducing the size of the instrument.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking member is used to stop the hammer member after string strike, then double strikes are prevented, but the structure becomes complicated and size increases
Solution Approach 1:
The invention extracts the braking function from a separate braking member and integrates it into the interlock control section. The guide section and interlock projecting section work together to automatically control the hammer member's motion, eliminating the need for a dedicated braking mechanism while maintaining the ability to prevent double strikes.
Solution Approach 2:
The invention merges the braking function with the interlock control mechanism. The guide section that guides the interlock projecting section also serves to control and limit the hammer member's motion, combining multiple functions into a single integrated structure that reduces overall complexity.
2Reliability
If a braking member is used to control hammer motion, then double strikes are prevented, but manufacturing and assembling works increase
Solution Approach 1:
The braking function is extracted from a separate component and integrated into the interlock control section, reducing the number of parts that need to be manufactured and assembled. This integration simplifies the manufacturing process and reduces assembly complexity.
Solution Approach 2:
The interlock control section serves multiple functions: it controls the transmission member's motion, guides the hammer member's movement, and prevents double strikes. This multi-functionality reduces the total number of components needed, thereby simplifying manufacturing and assembly operations.
3Reliability
If a braking member is installed to stop hammer motion, then double strikes are prevented, but the size of the instrument increases
Solution Approach 1:
The guide section and interlock projecting section are integrated into the existing action mechanism structure, eliminating the need for a separate braking member installation space. This merging of functions allows the double-strike prevention feature to be implemented without increasing the overall instrument size.
Solution Approach 2:
The dedicated braking member is extracted and its function is redistributed to the interlock control section components, which are already present in the action mechanism. This eliminates the need for additional installation space while maintaining the double-strike prevention capability.
4Reliability
If accurate motion timing is required for the braking member, then double strikes are prevented, but the structure becomes more complex
Solution Approach 1:
The interlock control section uses the natural motion sequence of the transmission member and hammer member to automatically control the timing. The guide section and interlock projecting section interact based on the existing motion timing, eliminating the need for additional timing control mechanisms while maintaining accurate motion sequencing.
Solution Approach 2:
The guide section is positioned and configured in advance to guide the interlock projecting section along a predetermined path. This preliminary arrangement ensures that the hammer member's motion is automatically controlled at the correct timing without requiring complex real-time timing mechanisms.
Data Source
AI summary
A keyboard device including a plurality of transmission members which are provided corresponding to a plurality of keys arranged in parallel and each of which makes a rotating motion in response to a depression operation on a corresponding key, a plurality of hammer members which are provided corresponding to the plurality of keys and each of which makes a rotating motion in response to the rotating motion of the transmission member and thereby provides an action load to the key, and a plurality of interlock control sections each of which controls the rotating motion of the hammer member made in response to the rotating motion of the transmission member by a relative motion of an interlock projecting section of the transmission member with respect to a guide hole provided in the hammer member.