| 摘要 |
A thread cutting device in a sewing machine comprising a clutch member mounted on the main shaft of said sewing machine for transmitting power from a prime mover to the main shaft of the sewing machine and interrupting the power transmission, a control lever for operating said clutch member in response to the rotation of the control lever in one or the other direction, a thread cutting cam for rotation as the main shaft rotates, a reciprocal shifter so associated with the control lever that the shifter moves reciprocally in response to the rotation of the thread cutting cam during the time period from the time about one complete revolution prior to the stoppage of the main shaft to the time of stoppage of the shaft, and a thread cutting mechanism for shearing a thread in response to the reciprocal movement of the shifter.
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