| 摘要 |
An infant swing apparatus comprises a first pivot shaft coupled with a swing arm, a motorized drive unit configured to drive rotation of the first pivot shaft in alternate directions, and a swing motion sensing unit including an encoder wheel securely mounted with a second pivot shaft. The second pivot shaft is directly coupled with the first pivot shaft in angular displacement via frictional interaction. As a result, the rotation of the first pivot shaft and corresponding swing motion can monitored in a precise manner.
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