A novel piano action mechanism is presented, which is based on a multi-lobed lifting cam. The cam replaces several bodies in the standard action mechanism and allows the upright piano to achieve fast repetition of a single note, which is a quality more commonly attributed to grand piano actions. The use of simulation software to aid in tuning of the design is described, and the final simulation results are presented. These results indicate the ability of the new mechanism to achieve good performance over a range of playing intensities and to play repeated notes in rapid succession.

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