| 摘要 |
A thread cutting device includes a thread catching member having a catching portion, wherein the thread catching member moves back and forth across a path of a lower thread reeled out from a bobbin so as to catch the lower thread by the catching portion and cuts the lower thread by cooperating with a fixed knife, a first power transmitting portion which transmits a power to the thread catching member, a first cam member provided on a lower shaft rotated by a sewing machine motor and transmits a first moving force to the thread catching member through the first power transmitting portion, a second power transmitting portion which transmits a second moving force from a stepping motor to the thread catching member through the first power transmitting portion.
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