Keyboard Hammer Unit Mounting Efficiency via Rotation Restriction
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Solution Overview
Problem
The assembly of keyboard instruments with hammer units is inefficient due to the significant hanging down of hammer members during mounting, which impairs the assembling process.
Innovation Solution
A keyboard instrument design featuring a hammer unit with a fulcrum and a hammer holder that restricts the rotation of hammer members within a specific range, using contact points on the effort point side to prevent excessive hanging and improve mounting efficiency, where the first length between the fulcrum and the effort point is longer than the second length between the fulcrum and the restriction member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hammer unit is mounted with the hammer members freely rotatable, then the hammer members can rotate significantly during mounting, but this causes the weight section side to hang down significantly, impairing assembling work efficiency
Solution Approach 1:
The patent applies preliminary anti-action by providing a restriction member that prevents the hammer members from rotating beyond a predetermined range during the mounting process. This restriction member is installed beforehand on the keyboard chassis and actively counteracts the natural hanging down motion of the hammer members, allowing efficient assembly without the stability problems caused by excessive rotation.
2Ease of operation
If the first length between the fulcrum and the effort point is made longer than the second length between the fulcrum and the restriction member, then the hammer members are properly controlled during mounting, but this requires specific dimensional relationships in the hammer holder design
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional relationships in the hammer holder design. The first length (from fulcrum to effort point) is made longer than the second length (from fulcrum to restriction member contact point), creating optimal geometric parameters that allow the restriction member to effectively control hammer member rotation during mounting while maintaining proper mechanical function.
Data Source
AI summary
A keyboard instrument including a hammer unit which includes a plurality of hammer members each of which has an effort point provided on one end side, a load point provided on an other end side, and a fulcrum provided between the effort point and the load point, and a hammer holder which rotatably holds the plurality of hammer members, and a keyboard chassis which includes a restriction member for restricting rotations of the plurality of hammer members performed in response to key depression operations within a restriction range and in which the hammer unit is mounted, in which the hammer holder has a plurality of contact points on the effort point side which comes in contact with portions of the plurality of hammer members on the effort point side when the hammer unit is in a vertically inverted state.