| 摘要 |
<p>The invention relates to a thread cutting device (10) of a sewing machine. The thread cutting device (10) includes a moving knife and a stand-by knife (3). The thread cutting device (10) is configured to cut a thread by a cooperation of the moving knife (2) and the stand-by knife (3) when the moving knife (2) is retreated to a cutting position. The thread cutting device (10) further includes a cam mechanism (40) configured to give a back and forth turning movement to the moving knife (2), an actuator (51) configured to connect and disconnect a power transmission between the cam mechanism (40) and the moving knife (2), and to advance the moving knife (2) from the most retreated position and retreat the moving knife (2) to the most retreated position, an interlocking mechanism (60) configured to interlock the stand-by knife (3) with the advancing movement of the moving knife (2) until the stand-by knife (3) reaches its most advanced position, a stand-by mechanism (70) configured to hold the stand-by knife (3) to prevent the stand-by knife (3) from retreating when the moving knife (2) retreats, a releasing means (24) for releasing the stand-by knife (3) from the stand-by mechanism (70) when the moving knife (2) has passed the cutting position, and a returning means (12, 12A) for returning the stand-by knife (3) to its most retreated position.</p> |
