| 摘要 |
A bobbin case tool to aid in the removal and installation of a prior art bobbin case on a sewing machine. The bobbin case tool includes an elongated arm having a clearance, a pair of lead in chamfers, a locking tooth disposed between the pair of lead in chamfers, and a locking tooth face. In application, the bobbin case tool designed to engage a releasing lever of the bobbin case and operatively pivot the releasing lever to an unlock position. The bobbin case tool is positioned so that the locking tooth is engaged in a spindle clearance of the releasing lever. The releasing lever of the bobbin case is rotated by the bobbin case tool until the releasing lever forces a locking plate of the bobbin case out of a spindle locking groove of a sewing machine's bobbin holder.
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