JPH0354699Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a metal fitting for holding a cloth attached to a two-needle downstitch sewing machine.

(b) Prior Art When sewing knitted fabrics for athletic wear, overlock stitching as shown in FIGS. 3 and 4 is commonly performed. For the purpose of reinforcing this overlock seam, lowering the lock part 22 to lower the peak, and creating a stitch decoration on the surface along both sides of the suture line 21, a double needle is often used to stitch it down. be. The present invention relates to a metal fitting for holding down the cloth used for this down stitching.

As a recent trend in overlock sewing mentioned above, the height of the lock part 22 is increasing due to the widening of the seam allowance in order to strengthen the seam. Now, some disadvantages have become apparent.

Conventional hold-down metal fittings are equipped with a fabric holding plate and a fabric guide claw, but they do not have a structure suitable for sewing the lock part, which is becoming taller these days. First, in particular, since the guide claw is integrally fixed to the main body of the metal fitting, when the presser metal fitting is used to perform covert stitching, the bulk of the lock portion 24 will increase as shown in FIGS. 5 and 6, for example. Therefore, the guiding operation of the fabric is not performed smoothly, and the fabric is fed in a distorted state, which causes the stitching line 23 to become bent, and stitches 25 and 26 of the upper thread of the lie-down stitch that appear on both sides of the stitching line 23. Often, these do not appear at equal intervals with respect to the suture line 23, seriously detracting from the appearance. In the figure, 27 indicates the bobbin thread of the lie-down stitch.

(c) Problems to be solved by the invention In view of the above-mentioned problems in the prior art, the present invention solves the problem of overlock stitching with a high lock part as shown in Figs. 7 and 8. , stitches 29 and 30 of the needle thread on both sides of the suture line 28 by overlocking are applied to the suture line 28.
To provide a fabric presser metal fitting for smoothly and beautifully performing down stitching with a double needle, such as appearing at equal intervals.

(d) Means for solving the problem The means adopted to solve the above problem will be described using an illustrative diagram. A pair of fabric presser plates 4 and 5 are attached to the presser metal body 3 so as to be movable up and down with the plate surfaces horizontally located on the outer sides of the parts 1 and 2, and a push spring provided on the presser metal body 3 is attached. 6 and 7 to press the cloth presser plates 4 and 5 from above, and then insert the plate-shaped cloth guide claw 8 on the presser metal main body 3 so that the plate surface is positioned forward on the center line of the needle drop portions 1 and 2. It is characterized in that it is attached vertically so as to be movable up and down, and the cloth guide pawl 8 is pressed from above by a pressing spring 9 provided on the presser metal body 3.

In addition, the presser metal fitting for double-needle understitching of this invention is
In the above configuration, the bottom surface 3 of the presser metal body 3
It is characterized in that cloth presser plates 4 and 5 are provided below the bottom surface and spaced apart from the bottom surface by a distance 10.

(E) Function The fabric having the overlocked seam is held down by the fabric holding plates 4 and 5, the fabric guide claw 8 is placed on the stitching line, the fabric is fed, and two-needle downstitching is performed. At this time, the lock portion of the fabric collapses due to the pressure of the sewing machine table, and at the same time, the fabric surface in this vicinity is raised. The cloth pressing plates 4 and 5 are pressed by pressing springs 6,
7, it moves up and down depending on the degree of bulge on the fabric surface, and does not cause distortion to the fabric. The cloth guide claw 8, which is pressed from above by the pressure spring 9, also moves up and down according to the degree of protrusion of the cloth surface, and during this time, the lower end of the nail plate perpendicular to the plate surface presses the cloth on the seam line. The fabric is fed while keeping the suture line straight.

Fabric presser plates 4 and 5, which are provided below the bottom surface 3a of the presser main body with an interval 10 from the bottom surface, rise to the maximum extent due to the protrusion of the fabric surface and come into contact with the bottom surface 3a of the main body. Even if there is a case, there is a space between the bottom surface 3a of the main body and the fabric surface at least equivalent to the thickness of the fabric presser plate 4 in the area sandwiched between the pair of fabric presser plates 4 and 5. Therefore, the bumps on the fabric surface can be accommodated in this space,
Does not interfere with cloth feeding.

(F) Example The example is as shown in FIGS. 1 and 2.
Bracket 1 protruding from the plate surface of cloth holding plates 4 and 5
1 and 12 pass through the presser metal body 3 and are slidable, one end of each of push springs 6 and 7 made of metal wire is fixed to the upper end of the bracket, and the other ends of the push springs are fixed to the upper end of the bracket. It is fixed to the first half body 3. A pair of cloth pressing plates 4, 5 are provided symmetrically with respect to the center line of the device, and are located below the bottom surface 3a of the main body.
A portion of each inner side overlaps with the bottom surface 3a.

The cloth guide claw 8 is provided between the bifurcated parts of the presser metal body 3, and has a long hole 13 on the plate surface.
14, and pins 15 and 16, which are installed in the branched portions of the main body 3, are loosely fitted into the elongated holes. The bottom of the U-shaped push spring 9 made of a metal wire presses the back of the cloth guide pawl 8, and the two ends of the push spring are fixed to the tips of the branched portions of the main body 3, respectively.

In the figure, 17 is a clamp that grips the presser bar.
The presser metal fitting is connected to the sewing machine body via this presser bar. 18 indicates a needle.

(g) Effect of the invention When the locking part of the overlock sewing fabric is sewn using the device of the invention, the fabric presser plates 4 and 5
The fabric guide claws 8 act as described above, and the fabric being fed is not distorted and the suture line can maintain a straight line. 1 and 2, the sewn fabric has a straight suture line 28 as shown in FIGS. The stitches 29 and 30 of the needle thread by the lie-down stitch appear neatly, and on the back side, the lock portion 31 is laid down by the bobbin thread 32 of the lie-stitch, reducing the height. The device of the present invention is suitable for face stitching of sewn fabrics with a tall lock part.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the device of the present invention, and FIG. 2 is a front view thereof. Fig. 3 is a surface view of the overlock stitched fabric, Fig. 4 is its cross-sectional view, Fig. 5 is a surface view of the conventional lay-sewn fabric, Fig. 6 is its cross-sectional view, and Fig. 7 is its cross-sectional view.
The figure is a surface view of the down-stitched fabric using the device of the present invention, and FIG. 8 is a sectional view thereof. 1, 2...needle drop part, 3...presser fitting body,
3a... Bottom surface, 4, 5... Cloth press plate, 6, 7...
...Press spring, 8...Cloth guide claw, 9...Press spring,
10...interval.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of fabric presser plates 4, 5 are attached to the presser metal main body 3 with their surfaces horizontal, so that they are located on the outer sides of the needle entry portions 1, 2 of the twin needles. Pressing springs 6 and 7 are movably attached and provided on the presser metal body 3.
Press the cloth presser plates 4 and 5 from above, and then insert a plate-shaped cloth guide pawl 8 on the presser metal body 3 with the plate surface perpendicular so that it is located forward on the center line of the needle drop portions 1 and 2. This presser metal fitting for double needle down stitching is characterized in that the presser metal fitting is attached so as to be movable up and down, and the cloth guide pawl 8 is pressed from above by a pressing spring 9 provided on the metal fitting main body 3. 2. The presser metal for double needle down stitching according to claim 1, characterized in that fabric presser plates 4, 5 are provided below the bottom surface 3a of the presser metal main body 3, spaced apart from the bottom surface by an interval 10.