JPS5839195Y2 - sewing machine suturing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a suturing device for a sewing machine that feeds a material to be sewn in the cloth feeding direction and sews it together, and particularly relates to a device that sews a material to be sewn made of a material with long legs so that it does not become fuzzed.

Conventionally, when sewing materials with long legs, such as knitted fabrics with pattern threads, the sides with pattern threads are overlapped on the front and back sides, sheared and sent in the cloth feeding direction, and the edges are overstitched, the edges of the fabric are The pattern thread on the front side becomes free due to shearing, and as a result, the pattern thread on the front side is pressed by the flat pressing part of the presser foot, and the material to be sewn moves in the cloth feeding direction by the feed dog, so that the material is moved in the cloth feeding direction due to friction. Bend it towards the front, and the pattern thread on the back side is fed by biting into the feed dog and bent in the cloth feeding direction, so the tip of the pattern thread cannot be sewn into the seam, and the pattern thread T protrudes from the seam, resulting in good quality. Not only is it impossible to obtain a product, but there are also drawbacks such as the protruding pattern thread getting tangled with the needle tip and breaking, or getting stuck in the feed dog, which interrupts work and reduces work efficiency.

The present invention aims to eliminate such drawbacks.

An embodiment of the present invention will be described with reference to the drawings. Fig. 2 is a perspective view of the presser foot A of the present invention in an overcut sewing machine, in which the front end 1 rises upward toward you along the cloth feeding direction, and the front end 1 On the lower surface of the presser foot 2, which extends rearward along the cloth feeding direction with the same width, there is a notch 3 cut out along the side edge of the cloth edge side, and a thread loop that extends rearward in series with this. 4, and a concave portion 6 facing the thread stitching portion 4 through the opening 5 is formed along the cloth feeding direction.

One end of the plate-shaped l-flange 7 is fixed to the upper surface of the rear end 8 of the presser foot A with a screw 9, and the other end is bent upward in the cloth feeding direction.

As shown in FIG. 3, the leg portion 10 extends upward from the left side of the upper surface of the presser foot A, and its tip is swingably fixed to the upper surface of the presser foot A.

The feed dog B is a sawtooth 12a that is disposed below the presser foot A, parallel to each other along the cloth feed direction, and has a tooth portion provided at the tip in a direction perpendicular to the cloth feed direction.

12b, 12C, and a notch 12d which is parallel to these sawtooths and has the teeth at the tip cut off so as to face the notch 3 of the presser foot A, and a rocker connected to a drive mechanism (not shown). It is supported on the upper end of the movable rod 11 and is configured to perform four-feeding motions by swinging the swing rod 11.

The needle plate C is placed on the sewing machine bed (not shown) facing the presser foot A, and has the saw teeth 12 a , 12 b , 12
Elongated holes 13 a and 13 into which C and 12 d are loosely fitted
b, 13 C13d is provided.

A needle N is provided above the opening 5 of the presser foot A, holds a needle thread (not shown) at its lower end, and moves up and down.

Since the present invention has the above-mentioned configuration, a workpiece made of a material with long legs, for example, a knitted fabric F in which the pattern threads T are exposed on the front and back sides as shown in Fig. 3, is sheared with an overedge sewing machine, To overlock the edges, first place the knitted fabric F on the throat plate C and presser foot A.
While pressing with the saw teeth 12 a , 12 b , 12 C
When the knitted fabric F is fed into the fabric feed direction, the front end 1 of the presser foot A is the same width as the presser foot 2 and is pushed upward toward the front, so that the knitted fabric F is not exposed to the front side. The knitted fabric F can be reliably advanced without catching the loops of the pattern threads T.

The knitted fabric F fed into the front end 1 has sawtooth 12a, 12
b, 12C, the thread is further sent to the presser foot section 2, and after being sheared by upper and lower knives (not shown), it is overstitched in the thread stitching section 4 with the thread (not shown) held at the lower end of the needle N. Since the pattern threads T, which are aligned at the time, move forward without contacting the notch 3 and the sawtooth notch 12d, the tips of the pattern threads T, which are perpendicular to the cloth feeding direction, are not bent in the cloth feeding direction, so that the seams are It is sewn securely into the seams without sticking out.

The sewn pattern thread T on the front side moves forward along the four parts 6 and is pressed by the lower surface of the rear end part 8 of the presser foot A.

It should be noted that the empty ring produced by the thread used to overlock the knitted fabric F is prevented from turning over to the overlocking portion 4 by the swivel collar 7.

As described above, in a sewing machine that feeds the workpiece F in a straight line in the cloth feeding direction and sews it, the present invention presses the workpiece vOF from above, and at the same time, the pressing part 2 is configured to press the workpiece VOF so as not to touch the workpiece F. A presser foot A with a notch 3 along the feeding direction and a workpiece F are fed in the cloth feeding direction and the workpiece is sewn: *
By providing a suturing device for a sewing machine that is equipped with a feed dog B having a notch 12d formed by cutting off the upper surface of the saw tooth facing the notch 3 of the presser foot A so as not to contact the presser foot A, it is possible to When a material, for example, a knitted fabric F made of pattern threads T, is overlapped and sheared and sewn as described above, the cut pattern threads T do not contact the presser foot A or the feed dog B, and are Since it is fed in the feeding direction and sewn into the seam, the tip of the pattern thread T does not protrude from the seam, and not only can a high-quality product with a beautiful appearance be obtained, but also the protruding pattern thread T can be sewn onto the needle N. This is highly effective in improving work efficiency because the work of threading the feed dog can be done smoothly without breaking the needle or interrupting the work.

In the embodiment of the present invention, an example of an overlock sewing machine is given, but a lockstitch sewing machine may also be used.In addition, in this embodiment, the notch 3 of the presser foot A is fed to the side edge of the back side of the presser foot A. Although the grooves are provided along the cloth feeding direction, the same effect can be obtained by providing grooves extending along the cloth feeding direction at appropriate locations on the back surface of the presser foot A.

[Brief explanation of drawings]

Fig. 1 is a perspective view of silk fabric sewn with handle threads using a conventional suturing device, Fig. 2 is a perspective view of the presser foot of the present invention, and Fig. 3 is a cross section of the suturing device of the present invention taken along Fig. 2 III-III. It is a diagram. In the figure, A is the presser foot, 2 is the presser foot, 3 is the notch, B is the feed dog, 12d is the notch, C is the throat plate, N is the needle, F is the knitted fabric, and T is the pattern thread. .

Claims (1)

[Scope of utility model registration request] In a sewing machine that sews a workpiece along a straight line in the cloth feeding direction, a notch along the cloth feeding direction is formed in a part of the suppression part that presses the workpiece from above so as not to contact the workpiece. A sewing machine comprising a presser foot and a feed dog having a notch opposite to a notch in the presser foot so that the workpiece does not come into contact with some of the serrations that feed the workpiece in the cloth feeding direction. suturing device.