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Sewing machine

a sewing machine and needle technology, applied in the field of sewing machines, can solve the problems of reducing efficiency, frequent needles, and interfering phenomena, and achieve the effect of preventing thread cutting or deteriorating quality

Inactive Publication Date: 2021-01-21
PARK JEONG HYEON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The disclosure describes a sewing machine that can prevent thread from being cut and maintain its quality by preventing interference between the needle and the upper thread.

Problems solved by technology

Due to such a horizontal movement of the sewing material in forward and backward and left and right directions, an interference phenomenon that the upper thread under the needle hole may brush a leading end of the needle may frequently occur.
In particular, since a relatively large tension is applied to the upper thread when the needle is lifted, the interference with the leading end of the needle may cause serious damage to the upper thread, which may be a serious cause of the occurrence of thread cutting and the reduction in efficiency accordingly, or a factor of deterioration in stitch quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

third embodiment

[0040] the excursion driver includes an excursion profile part 2212 that is disposed on a presser foot arm 2210 and has an inclined surface extending downward, and a roller member 2600 that is in contact with the excursion profile part 2212 and applies the excursion acting force when the pressing part 220 is at the lifting release height position.

[0041]In this case, as illustrated, the presser foot arm 2210 may further include an elastic member in the form of a leaf spring 2510 that smoothly performs the excursion movement and the release of the excursion movement in some sections.

[0042]According to the third embodiment, the presser foot arm 2210 moves up and down in synchronization with the needle bar 100 by a separate driver, and in this process, when the presser foot arm 2210 is lowered as illustrated in FIG. 6 due to the action of the excursion profile part 2212 and the roller member 2600, the roller member 2600 does not apply the excursion acting force to the excursion profile ...

fourth embodiment

[0044] the driver slidably drives the presser foot arm 3210 to move the presser foot arm 3210 up and down along the driving axial line, so the pressing part 220 is at the normal horizontal position where the axial line of the needle 110 and the axial line of the needle guide hole 221 match each other from the downward pressing height position, and is at the excursion horizontal position where the downward extending portion 21 of the upper thread 20 does not interfere with the needle 110 from the lifting release height position. At this time, the driving axial line corresponds to a moving axial line of the needle guide hole 221 at the normal horizontal position and the excursion horizontal position.

[0045]Hereinabove, as specifically describing the embodiments of the disclosure, according to the disclosure, the downward extending portion 21 of the upper thread 20 is spaced apart from the needle 110 when the needle 110 is lifted to prevent the interference between the upper thread 20 a...

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PUM

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Abstract

Disclosure relates to sewing machine capable of preventing thread cutting or deterioration caused by interference between leading end of needle and upper thread, that includes: head frame; needle bar supported on head frame to be movable up and down; needle having needle hole that penetrates in transverse direction with respect to axial line and has upper thread inserted thereinto and be coupled to lower end of needle bar to move up and down between lowered stitching position and lifted needle position; and presser foot unit having pressing part that is provided with needle guide hole through which needle passes and moves up and down between downward pressing height position where pressing part presses sewing material and lifting release height position where pressing part is lifted and spaced apart from sewing material and pressing foot arm that supports pressing part.

Description

TECHNICAL FIELD [1] The disclosure relates to a sewing machine.BACKGROUND ART[0001]In a sewing machine, a needle moves up and down vertically to form a stitch on a sewing material horizontally arranged. To this end, the needle is provided with a needle hole penetrating in a transverse direction, and an upper thread is lowered from the top, passes through the needle hole, and then extends downward. In the existing sewing machine, the sewing material mainly move linearly in one direction, but in a sewing machine, such as an embroidery machine, which forms various patterns, the sewing material moves in forward and backward and left and right directions within a horizontal plane with respect to an axial line of the needle.[0002]Due to such a horizontal movement of the sewing material in forward and backward and left and right directions, an interference phenomenon that the upper thread under the needle hole may brush a leading end of the needle may frequently occur. In particular, since...

Claims

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Application Information

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IPC IPC(8): D05B29/06D05B19/14D05B55/06
CPCD05B29/06D05B55/06D05B19/14
Inventor PARK, JEONG HYEON
Owner PARK JEONG HYEON