JPS6345253Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a presser foot for a sewing machine, and particularly to a presser foot for forming both welts used in a two-needle sewing machine with a knife.

[Conventional technology]

There are two known methods for making both bead edges, such as those used for pocket openings of clothing, by hand and automatically using a sewing machine. When making it by hand, layer the beaded fabric for the hem on the body fabric, sew it around the area that will become the beaded edge, make a notch, pull the beaded fabric from the notch to the back side, Adjust the shape of the bead and sew around it, then trim both ends of the bead and the edge of the bead fabric.

On the other hand, the method of automatically forming both bead edges using a sewing machine is a method that automatically performs the work equivalent to the above in one sewing operation.
It is disclosed in Japanese Patent No. 57-128978. Konoji Kaiaki
According to Publication No. 57-128978, first, the body fabric is placed on a workbench and pressed with a body fabric presser, and the hem fabric is formed into an inverted T shape using the hem fabric presser and a folding mechanism that cooperates with the hem fabric presser. Fold it into a shape, place it on top of the body fabric, transfer it to the sewing machine position by the fabric transfer mechanism, and place it at a position 2 inside the bent ends of both sides of the inverted T-shape of the welt fabric. The book is sewn using parallel sewing machine stitches, and the incisions are made using a scalpel.

[Problem that the invention attempts to solve]

As mentioned above, the method of making both bead edges by hand is time-consuming and requires skill, and is extremely inefficient.

On the other hand, the automatic welt forming device described above uses air cylinders and servo motors to operate the body fabric presser, hem decoration fabric presser, folding mechanism, fabric transfer mechanism, etc., and to detect the position of each fabric. , microcomputers, etc. are used, making it an extremely large-scale and extremely expensive device. Moreover, it is a completely dedicated machine, and the equipment efficiency is poor.

The purpose of this invention is to solve the above-mentioned problems, and it is a very inexpensive method that can easily form both bead edges, and can also form narrow both bead edges.
To provide a double welt forming presser foot that can be attached to an existing sewing machine.

[Means for solving problems]

The double welt forming presser foot of the present invention is a presser foot that is attached to a two-needle sewing machine with a female. It consists of a welt cloth guide binder that is integrally provided with the presser foot, and a knife guide that is connected to the binder, and the binder has an inverted T-shaped outer guide and an inverted T that partitions the inner space of the outer guide.
a female guide extending rearwardly from a vertical portion of the inverted T-shaped inner guide;
It is characterized by consisting of two guide walls that diverge at the position of the knife.

[Effect]

In the double welt forming presser foot of the present invention, the presser foot serves to press and guide the body fabric in the same way as a normal presser foot, and the binder serves to fold the welt fabric into an inverted T-shape. In addition, the knife guide is designed to prevent the knife located behind the sewing machine needle (with respect to the cloth feeding direction) from cutting the two free ends of the welt fabric that extend above the welt fabric folded into an inverted T-shape. It serves to open the free end.

To make both bead edges using the presser foot for forming double bead edges of the present invention, first place the bead cloth into the inverted T-shaped space formed between the outer guide and the inner guide of the binder for guiding the bead cloth. , fold the welt fabric into an inverted T-shape, guide the body fabric under both hem-forming presser feet, press it with the presser foot, place these at the needle drop position, and fold both sides of the inverted T-shape of the welt fabric. Two parallel machine stitches are applied to the inside of the folded edge to sew the hem fabric and body fabric together. Immediately behind the needle drop position, two free ends extending above the beaded fabric folded in an inverted T-shape are opened by the two guide walls of the knife guide, and the knife is inserted between the guide walls. Go in and make cuts in the beading fabric and body fabric.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

Figure 1 is a perspective view of the presser foot for forming both bead edges of the present invention, Figure 2 is a side view, Figure 3 is a top view of Figure 2, Figure 4 is a bottom view of Figure 2, and Figure 5 is a bottom view of Figure 2. The figure is a front view,
FIG. 6 is a rear view. Figures 7 to 9 are diagrams showing the relationship between the welt cloth, the body fabric, and the binder; Figure 7 is an end view of the cross section taken along the - line in Figure 2; FIG. 9 is a partially omitted end view taken along the line - in FIG. 2, and FIG. 9 is a partially omitted end view taken along the line - in FIG. Fig. 10 is a sectional view showing the beading fabric and body fabric sewn by the device of the present invention, and Fig. 11 shows the free end of the beading fabric being pulled out from the cut in the beading fabric and body fabric. The sectional view and FIG. 12 are perspective views showing both bead edges in a state just before completion.

As shown in FIG. 1, the double welt forming presser foot of the present invention is used by being attached to a sewing machine equipped with two sewing machine needles 5 and a knife 6, and includes a binder 1, a knife guide 2, and a fabric presser foot. 3 is the main part.

The presser foot 3 is similar to a normal presser foot, and the sewing machine needle 5
It has a presser foot 31 that functions to press the cloth before and after the needle drop position 33 where the needle drops, and this presser foot 31
It is attached to the support member 4 by a pivot 34 at a protrusion 35 from the support member 4 . The presser foot 3 can be attached to a presser bar (not shown) via a support member 4 and appropriate members in the same way as a normal presser foot.

A binder 1 for guiding the bead cloth is integrally connected to the tip of the presser part 31 by welding or the like.
As shown in FIGS. 3 to 5, the binder 1 is
It is located between two presser feet 3.

The binder 1 is composed of an inverted T-shaped outer guide 11 consisting of a vertical part 111 and a horizontal part 112, and an inverted T-shaped inner guide 12 also made of a vertical part 121 and a horizontal part 122, as shown in FIG. and the fifth
As clearly shown in the figure, the inner guide 12 hangs down from the top of the vertical portion 111 of the outer guide 11 and partitions an inverted T-shaped interior space of the outer guide 11. As shown in Figures 3 and 4,
Outer guide 11 and inner guide 12 of binder 1
is tapered from the front to the rear in the cloth feeding direction shown by arrow A, and as shown in FIG. This makes it easy to feed the body fabric to which the beading fabric is sewn underneath.

The vertical portion 121 of the inner guide 12 is shown in FIGS.
As shown in the drawings and FIG. 4, the knife guide 2 is formed of two guide walls 21 that protrude rearward from the outer guide 11 and branch from the vicinity of the needle drop position 33. The space formed between these two guide walls 21 is located corresponding to the knife 6 provided behind the sewing machine needle 5 when the double welt forming presser foot of the present invention is attached to the sewing machine. 6 becomes the female entry space 22 into which it enters.

The guide wall 21 of the knife guide 2 is shown in FIGS. 2 and 6.
As shown in the figure, preferably the lower surface of the presser foot 3
so that it is approximately the same height as the bottom of the In this way, the bead cloth 7 can be held down by the lower surface of the guide wall 21 (see FIG. 9), and the bead cloth 7 will not shift even when making cuts with the scalpel 6. In addition, when the knife 6 is installed upward as shown in FIG. Since it will not run away, you can make sure to make a cut. Note that even when the knife 6 is installed below the throat plate 9, the lower surface of the guide wall 21 is set at approximately the same height as the bottom surface of the presser foot 3, as described above, so that the bead cloth 7 is not affected by the action of the knife 6. It is best to avoid floating at times.

Also, the needle drop position 33 of the presser foot 31 of the presser foot 3
A welt cloth gripping portion 32 extends upward from the vicinity toward the horizontal portion 112 of the binder 1. This welt cloth gripping portion 32 serves to hold down the free end portion 73 of the folded welt cloth 7 that has come out of the binder 1 and prevent it from spreading outward.
(see figure).

The procedure for forming bead edges using the presser foot for forming double bead edges of the present invention will be explained below based on FIGS. 7 to 12.

To make both bead edges using the presser foot for forming double bead edges of the present invention, pass the bead fabric 7 through the bead fabric guide binder 1 and fold it into an inverted T shape, and place the body fabric 8 on the throat plate 9. Place the cloth and press it with the presser foot 3, then use the sewing machine to sew the beading fabric 7 and body fabric 8 together with two parallel seams 71. Make a cut 72 in 7 and body fabric 8.

That is, as shown in FIG. 7, near the tip of the double welt forming presser foot of the present invention, the body material 8 is placed on the throat plate 9, while the outer guide 11 of the binder 1 is placed on the needle plate 9.
The bead cloth 7 is passed through the space formed between the inner guide 12 and the inner guide 12, and is bent along the inverted T-shaped inner guide 12. In this case, the beading cloth 7 and body fabric 8 should be facing inside, and the bottom side of the beading cloth 7 should be facing out.
The body fabric 8 is placed with the top side facing out.

FIG. 8 is a diagram showing the relationship between the welt forming presser foot, the sewing machine needle 5, the welt fabric 7, and the body fabric 8 at the needle drop position 33. Note that the presser portions 31 of the pressers for forming both bead edges are omitted from the illustration. Needle drop position 33
In this case, holes 91 are provided in the throat plate 9 at locations corresponding to the two sewing machine needles 5, respectively. At this position, the beading cloth 7 and the body fabric 8 are sewn with the sewing machine needle 5, and two parallel stitches 71 are formed inside the bent ends 74 of the inverted T-shape of the beading cloth 7.
is formed. At this time, the free end 73 of the welt cloth 7
are separated from each other by vertical portions 121, but are prevented from spreading outward by beading grips 32, so that the free end 73 of beading cloth 7 is inadvertently caught by sewing machine needle 5. Sewing is prevented.

In addition, in FIG. 8, the tip of the welt cloth gripping part 32 is shown by a two-dot chain line.

FIG. 9 is a cross-sectional view at the position of the knife 6,
Similarly to FIG. 8, the presser portion 31 is omitted from the illustration. In this position, the presser portion 31 presses not only the body fabric 8 but also the bent end 74 of the welt cloth 7. As shown in FIG.
There are two guide walls 21 and a hole 92 formed in the needle plate 9 for female entry. Two free ends 73 extending upwardly of the welt cloth 7 are opened by the guide wall 21, and the knife 6 is inserted into the knife entry space 22 between the guide walls 21.
enters and makes a cut 72 in the welt cloth 7 and the body cloth 8 approximately at the center of the two stitches 71 sewn by the sewing machine needle 5. Since the knife 6 operates with the free end 73 of the welt cloth 7 opened by the guide wall 21, the free end 73 of the welt cloth 7 is not accidentally cut by the scalpel 6. There is no.

FIG. 10 is a sectional view showing the hem cloth 7 and body cloth 8 in a sewn state. The beading cloth 7 and the body cloth 8 folded into an inverted T-shape are sewn together on the front side by two seams 71, and a notch 72 is provided between the seams 71 and the seams 71. The portion of the bent end 74 on the outside of the seam 71 of the beading cloth 7 is the part that becomes the beading edge. Since the notch 72 is linear, after sewing, make V-shaped notches at both ends of the notch 72 so that the notched ends are in the shape of arrow feathers, and the end of the welt edge will be finished neatly. be able to.

Figure 11 shows the cut 7 in the welt cloth 7 and the body cloth 8.
2, the free end 73 (facing upward in FIG. 10) of the welt cloth 7 is pulled out to the back side of the body fabric 8.

FIG. 12 is a perspective view showing both welts in a state just before completion, with the free end 73 of the welt cloth 7
The back side of the body fabric 8 is further bent from the state shown in Figure 1, and in this way the two bent ends 7 of the welt fabric 7 are folded.
4 becomes the bead. From this state, the free ends 73 are disposed of as usual and both ends of the bead are finished, thereby completing both bead edges.

In addition, it is preferable to prepare several types of inverted T-shaped binders for the presser foot for forming both bevel edges of the present invention, depending on the width of the bevel to be formed or the thickness of the fabric to be sewn. . And when changing the width of the bead,
It is best to adjust the needle spacing and replace with a suitable binder.

[Effect of idea]

According to the present invention, even an unskilled worker can easily form both welts by simply passing the welt cloth through the binder, resulting in high production efficiency. Furthermore, since the binder for forming the bead is integrated with the presser foot of the sewing machine, the bead fabric is reliably guided by the binder until just before it is sewn, and a neat finish can therefore be achieved. Moreover, with the presser foot for forming double bead edges of the present invention, not only wide bead edges but also narrow bead edges (for example, a 3 mm wide bead edge) can be easily and neatly formed.

The double welt forming presser foot of the present invention is much cheaper than conventional automatic welt forming devices, and can be attached to existing sewing machines. By using the presser foot for forming double welt edges of the present invention, the sewing machine does not need to be a dedicated machine for forming welt edges. Therefore, it can be replaced with another presser foot as needed, making effective use of the sewing machine. can.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the presser foot for forming both bead edges of the present invention, Figure 2 is a side view, Figure 3 is a top view of Figure 2, Figure 4 is a bottom view of Figure 2, and Figure 5 is a bottom view of Figure 2. The figure is a front view,
FIG. 6 is a rear view. Figures 7 to 9 are diagrams showing the relationship between the welt cloth, the body fabric, and the binder; Figure 7 is an end view of the cross section taken along the - line in Figure 2; FIG. 9 is a partially omitted end view taken along the line - in FIG. 2, and FIG. 9 is a partially omitted end view taken along the line - in FIG. Fig. 10 is a sectional view showing the beading fabric and body fabric sewn by the device of the present invention, and Fig. 11 shows the free end of the beading fabric being pulled out from the cut in the beading fabric and body fabric. The sectional view and FIG. 12 are perspective views showing both bead edges in a state just before completion. DESCRIPTION OF SYMBOLS 1... Binder, 2... Knife guide, 3... Presser foot, 4... Support member, 5... Sewing machine needle, 6... Scalpel, 7... Welt cloth, 8... Body fabric, 9... needle plate,
11...Outer guide, 12...Inner guide, 21...
Guide wall, 121... Vertical section, 33... Needle drop position.

Claims (1)

[Scope of utility model registration request] This is a presser foot for a two-needle sewing machine with a female, and the presser foot has a cloth presser foot provided corresponding to the needle drop position, and a bead located in front of the needle drop position and integrally provided with the cloth presser foot. It consists of a fabric guide binder and a female guide connected to the binder, the binder consists of an inverted T-shaped outer guide and an inverted T-shaped inner guide that partitions an internal space of the outer guide, A presser foot for forming double welt edges, characterized in that the knife guide consists of two guide walls extending rearward from the vertical part of the inverted T-shaped inner guide and branching at the knife position.