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A kind of sewing machine and thread pulling device thereof

A sewing machine and thread knife technology, which is applied in the field of sewing, can solve the problems of high tension of machine needles and threads, late time of needle and thread off-line, and can not meet the needs of sewing, and achieves the effect of simple structure and meeting the needs of sewing.

Active Publication Date: 2020-08-07
JACK SEWING MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After sewing a few stitches to form stitches, the needle thread does not need tension to ensure that the subsequent sewing stitches are neat and beautiful; The tension of the needle thread is relatively high, which leads to the delay of the needle thread unthreading after the sewing starts, which cannot meet the sewing needs

Method used

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  • A kind of sewing machine and thread pulling device thereof
  • A kind of sewing machine and thread pulling device thereof
  • A kind of sewing machine and thread pulling device thereof

Examples

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Embodiment Construction

[0023] The core of the present invention is to provide a thread pulling device for a sewing machine, which integrates the thread pulling function and the thread loosening function, and can ensure that the needle and thread start sewing smoothly and take off the thread in time. Another core of the present invention is to provide a sewing machine including the above thread wiping device.

[0024] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1 to Figure 3 , figure 1 It is a structural schematic diagram of a specific embodiment of the thread pulling device of the sewing machine provided by the present invention; figure 2 It is a rear view of a specific embodiment of the thread pulling device of the sewing machine provided by the present invention; imag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The invention discloses a sewing machine and a thread shifting device thereof. The thread shifting device comprises a mounting plate, a thread shifting tool, a thread clamping component, a driving crankshaft, a transmission connecting rod, a thread release connecting rod, a rotary driving part, a linear driving part and a return spring. The rotary driving part and the linear driving part are arranged on the mounting plate, and the return spring is used for driving the transmission connecting rod to return. When a thread shifter is required for thread shifting after sewing is finished, the rotary driving part drives the driving crankshaft to swing leftwards to enable movement of the transmission connecting rod, the return spring is stretched, the transmission connecting rod drives the thread shifting tool to rotate by a certain angle, and then the thread shifting tool hooks a thread to return under the action of the return spring and cooperates with the thread clamping component to clamp the thread. When thread release is required after stitches are formed next time, the linear driving part drives the driving crankshaft to swing leftwards by a small amplitude through the thread release connecting rod, and then the transmission connecting rod moves leftwards by a small amplitude to make the thread shifting tool rotate anticlockwise by a certain angle. A tool bit of the thread shifting tool is away from the thread clamping component, the thread is separated from the tool bit to realize timely thread release, and accordingly sewing demands can be met.

Description

technical field [0001] The invention relates to the technical field of sewing, in particular to a thread pulling device for a sewing machine. In addition, the present invention also relates to a sewing machine comprising the above thread wiping device. Background technique [0002] When the sewing mechanism sews fabrics, a certain length of thread ends is left at the needle eye of the machine needle when sewing starts. Pull up the end of the thread at the end of the last sewing, so that the needle thread has a certain tension, and ensure that the machine can drive the needle thread to start sewing smoothly at the next sewing start. [0003] After sewing a few stitches to form stitches, the needle thread does not need tension to ensure that the subsequent sewing stitches are neat and beautiful; The tension of the needle thread is relatively large, which leads to the delay of the needle thread unthreading after the sewing starts, which cannot meet the sewing needs. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B53/00
CPCD05B53/00
Inventor 李卫超王志阮勤波洪建敏
Owner JACK SEWING MASCH CO LTD
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