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(11) | EP 2 228 477 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Thread cutting device for sewing machine |
| (57) The invention relates to a thread cutting device (20) for a sewing machine (10).
The thread cutting device (20) includes an upper knife (22), a lower knife (23), an
open-close link (24) coupled to the upper knife (22) and the lower knife (23), a drive
source (28) coupled to the open-close link (24) to move the open-close link (24) back
and forth along a linear direction. A thread is cut by closing the upper knife (22)
and the lower knife (23). The thread cutting device (20) further includes a conversion
link (25) having one end rotatably coupled to the open-close link (24) and the other
end rotatably coupled to the lower knife (23). The conversion link (25) converts the
back-and-forth movement of the open-close link (24) into a circular movement and transmits
the circular movement to the lower knife (23).
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