Electronic Keyboard Hammer Weight Mounting Mechanism
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Solution Overview
Problem
Conventional hammers for electronic keyboards are difficult to assemble and disassemble due to complex mounting mechanisms and potential gaps between components, leading to wobbling and noise during pivotal motion.
Innovation Solution
A hammer design featuring a resin molded hammer body with a weight mounting portion that includes a housing with a complementary shape for the weight's mounting portion, allowing for secure and easy assembly and disassembly through a sliding mechanism with latching and holding features, preventing wobbling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mounting mechanism is used to secure the weight to the hammer body, then the weight is securely attached, but the assembly and disassembly process becomes complicated and troublesome
Solution Approach 1:
The mounting portion is divided into two functional segments: a latching portion that secures the weight during operation and a release portion that enables easy disassembly. This segmentation allows the mechanism to provide secure attachment while maintaining simplicity in assembly and disassembly operations.
Solution Approach 2:
The mounting portion transitions from a static locked state during operation to a dynamic release state during disassembly. The latching portion engages automatically during assembly, then can be easily released by pressing the release portion, providing both secure attachment and ease of operation through dynamic state changes.
2Reliability
If manufacturing precision is high to eliminate gaps between components, then wobbling and noise are reduced, but manufacturing cost increases
Solution Approach 1:
The latching portion automatically engages with the hammer body during assembly without requiring high precision manufacturing. The self-latching mechanism compensates for normal manufacturing tolerances, eliminating the need for expensive high-precision manufacturing while still preventing wobbling and noise.
Solution Approach 2:
The design changes the engagement parameter from requiring precise dimensional matching to using a mechanical latching action that is insensitive to normal manufacturing variations. This parameter change allows standard manufacturing tolerances to suffice while maintaining reliability.
3Strength
If the hammer holder is made of hard synthetic resin material, then structural strength is improved, but the urging force required for assembly increases
Solution Approach 1:
The assembly force is segmented into two phases: initial insertion phase requiring moderate force, and latching phase where the latching portion automatically engages without requiring additional urging force. This segmentation allows use of hard synthetic resin material while controlling the assembly force requirement.
Solution Approach 2:
The latching portion performs the final securing action automatically during assembly, eliminating the need for high urging force. The self-latching mechanism does the work that would otherwise require additional assembly force, allowing use of harder materials.
Data Source
AI summary
A hammer for an electronic keyboard instrument, constructed to ensure secure mounting of a weight to a hammer body and enable both assembly and disassembly of the hammer to be easily performed. The hammer includes a hammer body having a weight mounting portion that is open on one side in a left-right direction and a weight removably mounted to the hammer body via a mounting portion. The weight mounting portion has a housing portion that has an opening having a shape complementary to the mounting portion, and houses the mounting portion in a manner slidable between a fit-in position and a fixed position, latching portions for latching the mounting portion incapable of falling off from the opening when in the fixed position, and holding portions for holding the mounting portion non-slidable to the fit-in position.