Tread cutter
A thread cutting and driving device technology, which is applied to the control device for sewing machines, the mechanism for cutting threads in sewing machines, textiles and papermaking, etc.
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Embodiment 1
[0045] Before describing the thread cutting device 11 of the first embodiment, a schematic configuration of a lockstitch buttonhole sewing machine provided with this thread cutting device will be described.
[0046] As shown in Figure 2, the sewing machine frame 4 placed on the sewing machine table has a slightly rectangular box-shaped machine table 1, and a vertical main body 2 erected from the rear of the machine table 1, and is positioned at the vertical main body 2 top, and the machine table. 1 opposite and extending nose 3.
[0047] In addition, a needle bar (not shown) to which the needle 5 is fixed is supported at the front end of the machine head 3 so as to be able to move up and down and swing left and right. A rotary hook device (not shown) opposite to the needle bar is provided on the machine table 1 . The rotary hook device is equipped with a bobbin for winding the bottom thread, and cooperates with the machine needle 5 to form flat seam stitches.
[0048] Below ...
Embodiment 2
[0105] Below, refer to Figure 6 ~ Fig. 8, the thread cutting device of the second embodiment is described.
[0106] The thread cutting device of this example is installed on the buttonhole sewing machine similarly to the first embodiment. That is, the same as in Embodiment 1, the sewing machine has a frame, a machine needle, a rotary hook, a needle bar up and down drive mechanism, a needle bar swing mechanism, a cloth pressing mechanism, and a cloth pressing arm 7 ( Figure 6 And shown in Figure 7), cloth feeding mechanism, depression bar and cloth cutting mechanism. In the second embodiment, the same structures as those in the first embodiment are denoted by the same symbols, and detailed description thereof will be omitted.
[0107] The thread cutting device of this example includes an upper thread cutting device 71 for cutting the upper thread and a lower thread cutting device 90 for cutting the lower thread.
[0108] First, the upper thread cutting device 71 will be desc...
Embodiment 3
[0137] Next, the thread cutting device of the third embodiment will be described.
[0138] The thread cutting device of this embodiment is installed on the buttonhole sewing machine similarly to the first embodiment. That is, the same as in Embodiment 1, the sewing machine has a frame, a machine needle, a rotary hook device, a drive mechanism for the needle bar to move up and down, a needle bar swing mechanism, a cloth pressing mechanism, and a cloth pressing arm 7 (shown in FIGS. 9 and 10 ) , cloth feeding mechanism, pressing rod and cloth cutting mechanism, etc. In addition, in the third embodiment, the same reference numerals are assigned to the same structures as those in the first embodiment, and description thereof will be omitted.
[0139] The thread cutting device of Embodiment 3 has the upper thread cutting device 100 (shown in Fig. 9 and Fig. 10) for cutting the upper thread drawn out from the machine needle and the lower thread cutting device 130 (shown in Fig. 12 ...
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