| 摘要 |
The present invention relates to a thread cutting device for a sewing machine. The thread cutting device may adjust the state of a thread in a knife assembly since it is difficult to adjust the state of the thread through a sewing machine body. A cutting part having first and second protrusions and cut-out grooves may be formed on a knife of the knife assembly so as to reduce wasting of thread since thread remaining after sewing is cut to a short length when compared to that in a thread cutting device according to a related art. Further, the thread may be prevented from being tangled so as to improve work efficiency. The thread cutting device of the sewing machine according to the present invention consists essentially of: a sewing machine body (20); and a knife assembly (30) installed under the sewing machine body and having a knife (70) for cutting the thread after sewing. The knife assembly (30) consists essentially of: a hook body (40) mounted on a driving shaft (42); a bobbin case (50) received in the hook body (40); a bobbin (60) arranged within the bobbin case (50) so as to allow thread to be wound therearound; and the knife (70) disposed on the hook body (40) in order to cut the thread. The knife (70) has a curvature corresponding to an outer circumference of the bobbin case (50). Further, the knife has one side in which a coupling groove (72) is formed for coupling to the bobbin case (50) and the other side on which a cutting part (74) is formed for cutting the thread. |
