Double-thread over-locking sewing machine
A sewing machine and thread lock technology, which is applied to sewing machine components, sewing equipment, cloth pressing mechanisms, etc., can solve the problems of increasing manufacturing costs and achieve the effect of reducing costs.
Inactive Publication Date: 2006-05-17
YAMATO SEWING MASCH MFG CO LTD
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Problems solved by technology
[0008] However, if the electronic motor is used to electronically control the entire sewing machine, there will be a problem of increased manufacturing costs.
Method used
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[0044] refer to figure 1 with figure 2 ,in figure 1 It is a perspective view showing a double-thread overlock sewing machine 30 according to a first embodiment of the present invention, figure 2 It is an enlarged perspective view showing the vicinity of the needle plate 32 of the sewing machine 30 from behind. The sewing machine 30 has a sewing machine head 31 and a sewing machine body 33 provided above the sewing machine head 31 . The base end portion of this sewing machine body 33 is provided with a thread clamp 39 and a thread tension device 60 with a plurality of thread clamping members 130; The needle bar 61 is supported on the front end of the sewing machine body 33, and can be moved up and down vertically. In the needle holder 34 at the lower end of the needle bar 61, two needles 35, 36 are vertically fixed at intervals left and right. Behind the needle bar 61 , a pressing bar 59 is provided parallel to the needle bar 61 . A presser foot 37 is attached to the low...
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A double-thread overlock sewing machine with low cost and switchable thread clamping state, which has an upper thread clamping part, a lower thread clamping part, and a pin provided between the upper thread clamping part and the lower thread clamping part. The thread tension state switching member, and the reciprocating movement mechanism, the reciprocating movement mechanism includes: a thread loosening return lever, which is engaged with a pin provided on the thread tension state switching member, and the thread tension state switching member is moved toward the said one side moves; a curved part is provided on the end of one side of the said thread clamping state switching member, and the reciprocating movement mechanism stretches the curved part to the other side to make the thread clamping The state switching member moves to the other side, and the angular displacement of the thread loosening return lever is performed in conjunction with the operation of the function of raising the presser foot. By raising the presser foot, the first or second Any one of the thread clamping states in the switch to another thread clamping state.
Description
technical field [0001] The invention relates to a double-thread lockstitch sewing machine, in particular to a double-thread lockstitch sewing machine whose clamping state can be changed. Background technique [0002] In the case of continuous sewing of many layers of fabrics (gray fabrics) with a double-thread overlock sewing machine, sometimes a gap is left between the fabrics and a so-called "empty loop" seam (stitch) is formed between the fabrics connection, so that the sewing operation can be carried out continuously. [0003] When sewing, the upper thread is in a tensioned state and the lower thread is in a slack state to sew, but when an empty loop is formed, the upper thread is in a loose state and the lower thread is in a tighter state. In this way, the switching of the clamping state (tension state) of the upper thread and the lower thread is performed by the thread tension device. [0004] The thread tension device includes: a pair of thread tension discs for pin...
Claims
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IPC IPC(8): D05B1/12D05B29/08D05B47/00D05B47/02D05B1/10
Inventor 岩井胜彦水崎隆冈部正人
Owner YAMATO SEWING MASCH MFG CO LTD