Needle-thread guiding out device of sewing machine

Abstract

The present invention relates to a needle thread lead-out device of a sewing machine which is formed by controlling the lead-out of the needle thread fed by a fixed needle thread track from a thread adjuster and descending toward the needle. The third needle thread lead-out hole is a first needle thread lead-out hole formed through the front end portion of the movable thread lead-out member that reciprocates in the vertical direction and a second needle thread lead-out hole formed in the substantially middle portion in the longitudinal direction. The needle thread part in between is guided downward in a substantially V-shaped curved state, so that, not to mention ordinary fabrics, even soft and elastic fabrics such as microfiber textured fabrics are used as sewing objects. , It is also possible to appropriately control the amount of derivation, so that good sewing can be performed without causing quality degradation such as poor sewing and half-moon bulging.

Description

【Technical field】 [0001] The present invention relates to a needle thread lead-out device (reeling device) mainly used in a multi-needle flat chain sewing machine. Specifically, it relates to a needle thread lead-out device for a sewing machine having a structure in which a needle supported by a left end portion of the sewing machine arm so as to reciprocate in an up and down direction is provided at a substantially middle position on the left and right sides of the arm of the sewing machine. The up and down reciprocating movement of the rod is synchronously linked, and the movable needle thread lead-out member reciprocatingly rocks in the up and down direction, through the reciprocating rocking motion of the movable needle thread lead-out member, After the tuner) is exported (reeled out), the needle thread supplied by the fixed needle thread path is exported and controlled, and is guided downward toward the needle installed at the lower end of the needle bar. 【Background t...

AI Technical Summary

Problems solved by technology

[0004] However, when the gray cloth made of a very soft and elastic material such as microfiber texture, which has become more versatile in recent years, is used as the sewing object, if the above-mentioned conventional needle thread deriving device is used as it is, it will not slack. Needlework and looping thread (ル—パ ) and the sewing stitches formed are wrapped around the hooks of the needle plate and are difficult to pull out from the hooks. Not only is the feeding of the gray fabric hindered, resulting in poor sewing, but even if the stitches can be pulled out from the hooks, the following phenomena will appear: When the needle penetrates the gray cloth and reaches the bottom dead center, the needle thread in the tensioned state is pressed downward into the gray cloth. The loop thread lowers the needle penetration part of the gray fabric, so that the gray fabric part at the sewing place is tightened too strongly, and as a result, the gray fabric part at the sewing place rises in a half-moon shape, and the sewing quality deteriorates.

[0005] That is to say, the variable mechanism with conventional needle thread lead-out devices, in the final analysis, when the usual gray cloth is used as the sewing object, the lead-out amount of the needle thread can only be adjusted within the range that can maintain thread adjustment and seam adjustment. Therefore, the control range of the needle thread lead-out amount determined by it cannot sufficiently avoid the above-mentioned sewing defects that occur when the gray fabric made of a very soft and elastic material such as the above-mentioned microfiber texture is used as the sewing object. and half-moon bulge caused by the range of sewing quality degradation, so the reduction in sewing quality such as half-moon bulge cannot be avoided

Images