Thread trimming method for sewing machine
A sewing machine and thread trimming technology, which is applied to the thread cutting mechanism, sewing machine components, sewing equipment and other directions in the sewing machine, can solve the problems of high dependence on the shape of the cam track, complex track cam parts, etc., and achieves high reliability, simplified structure, The effect of simplifying the exercise process
Inactive Publication Date: 2017-01-04
JACK SEWING MASCH CO LTD
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Problems solved by technology
With the strengthening of research and development capabilities, the thread trimming device on the sewing machine has been developed and improved for a long time, and the thread trimming function has been realized more reliably; but there are still defects: the thread trimming device needs a cam part with a complicated track, and the cam track The shape is highly dependent, and the accuracy of the trajectory is required to ensure the reliability of the thread trimming function
Method used
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[0033] The present invention will be further described below with specific embodiment, see figure 1 -8:
[0034] A thread trimming method for a sewing machine, comprising the steps of:
[0035] 1) When thread trimming is not required, the moving knife rest 1 and the lower shaft 3 are separated, the lower shaft 3 rotates, and the moving knife rest 1 does not rotate. The moving knife rest 1 is provided with a knife 1, and the moving knife is selected in this embodiment 2.
[0036] 2) When the controller receives the thread trimming signal, before the hook 4 rotates to the thread trimming angle, the controller controls the power part to drive the clutch mechanism so that the moving knife rest 1 is connected to the lower shaft 3 and rotates together with it. At this time, the moving knife 2 also rotate together.
[0037] 3) The knife point 5 of the movable knife 2 passes through the thread loop of the upper thread 6, and the pulling groove 7 on the movable knife 2 moves to the ...
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The invention belongs to the technical field of sewing machines, and particularly relates to a thread trimming method for a sewing machine. The thread trimming method comprises the steps that firstly, when thread trimming is not carried out, a moving cutter rack and a lower shaft are in a separated state, the lower shaft rotates, and the moving rack does not rotate; secondly, when a controller receives a thread trimming signal, the controller controls a power component to drive a clutch mechanism to make the moving cutter rack and the lower shaft connected and rotate together, and a first cutter on the moving cutter rack and the lower shaft rotate together; thirdly, when the first cutter on the moving cutter rack penetrates through a thread ring of an upper thread, a thread pulling groove in the first cutter drives one side of the upper thread and a bottom thread to move towards a second cutter, when the edge of the first cutter carrying the upper thread and the edge of the second cutter are meshed, the thread is cut off, and the thread trimming action is completed. According to the thread trimming method for the sewing machine, the clutch mechanism is used for driving the moving cutter rack and the lower shaft to synchronously rotate by one circle along with a rotating shuttle to achieve the rotating thread trimming action with the fixed cutter, the dependence on a thread trimming cam in an existing structure is avoided, the thread trimming moving process and the structure of the whole thread trimming device are simplified, and the reliability of the thread trimming function is high.
Description
[0001] Technical field: [0002] The invention belongs to the technical field of sewing machines, in particular to a thread trimming method for a sewing machine. [0003] Background technique: [0004] The sewing machine needs to trim the thread after each sewing operation, that is, the thread connected between the needle and the sewing material is cut off. The traditional sewing machine itself does not have a thread trimming function, and the operator needs to use scissors to complete the thread trimming action. In response to the defects of manual thread trimming, the R&D personnel have added a thread trimming function to the sewing machine. This type of thread cutting device includes a fixed knife fixedly installed on the casing, and a reciprocating moving knife. Its working principle is: when sewing needs thread trimming, a clutch device is driven by a driving device (such as an electromagnet, cylinder, etc.) to connect the thread trimming device with the main movement me...
Claims
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Login to View More IPC IPC(8): D05B65/00
CPCD05B65/00
Inventor 蒋昌林管建平王明敏蔡鹏鹏
Owner JACK SEWING MASCH CO LTD