JPH0570472U - Presser foot device for pleats in overlock sewing machines - Google Patents

Abstract

(57) [Abstract] [Purpose] In overlock sewing machines with two feed dogs with different cloth feed amount, it is suitable to fold seams while forming pleats on the cloth, regardless of the thickness of the cloth to be sewn. The pleated seam is formed and the sewing position from the edge of the fabric can be freely set. [Structure] A support body P installed on the upper surface of a presser foot 3, and an upper support movably supported by the support body P in the vertical direction, and a lower presser foot 3 and a first feed dog 1 with a large amount of cloth feed. Is provided with a blocking plate C for separating the lower cloth W1 and the upper cloth W2 between them, and the central portion Ca connecting the upper and lower portions of this blocking plate C is located behind the female portion 7 of the cutting means of the sewing machine. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a presser foot device for pleat stitches in an overlock sewing machine, and more particularly to a presser foot device for pleat stitches in an overlock sewing machine that forms an appropriate pleat stitch regardless of the thickness of the fabric to be sewn.

[0002]

[Prior Art]

 Fig. 3 shows the sewn portion of the pleated seam that is sewn while forming pleats (frills) on the fabric. In FIG. 3, 1 is a first cloth feed dog, and 2 is a second cloth feed tooth.

As is well known, the cloth feed dog of the sewing machine makes four movements so as to project from the through hole 4a of the needle plate 4 and feeds the cloth W placed on the upper surface of the needle plate 4, and is pleated. In sewing, the cloth feed amount of the first cloth feed dog 1 located at the front of the cloth W in the feed direction (indicated by an arrow) is large, and the cloth feed amount of the second cloth feed tooth 2 located at the rear is small. It has become.

As described above, in the cloth W fed by the two feed teeth having different cloth feed amounts, the fold A is formed due to the difference in the feed amount, and the formed fold A is the bottom surface of the presser foot 3. To the inside of the pleated receiving groove 5 formed in.

The sewing needle N forms a predetermined stitch in the state where the fold A is formed, and the fold A can be left on the cloth W.

By the way, the cloth W sewn in the pleat sewing generally consists of two cloths, an upper cloth W1 and a lower cloth W2.

When pleats are sewn with the two cloths W1 and W2, the upper cloth W1 is sewn so that the upper cloth W1 is flat and the folds A are formed on the lower cloth W2.

In order to perform such sewing, it is necessary to make the feed amount constant in the upper cloth W1, and today, as shown in FIGS. 4 and 5, between the first feed dog 1 and the presser foot 3. A method is adopted in which a blocking plate is installed so that the drive of the first feed dog 1 is not transmitted to the upper cloth W1, and the upper cloth W1 is fed only by the second feed dog 2.

4 and 5 both show (a) a side view of the presser foot device for pleat stitching and (b) a front view of the presser foot device for pleat stitching.

The blocking plate shown in FIG. 4 is fixed to the upper surface of the presser foot 3 at an upper portion thereof, has a U-shaped cross section, and is formed by a leaf spring 6 positioned below the presser foot 3 at a predetermined interval.

The shut-off plate shown in FIG. 5 has one end fixed to the machine frame 8 and the tip formed by a fixed plate 7 positioned at a predetermined distance from the first feed dog 1.

[0012]

[Problems to be solved by the device]

 However, the above-mentioned conventional presser foot device for pleat sewing has the following problems. When the upper cloth W1 has a thin shape, the blocking plate 6 made of a leaf spring shown in FIG. 4 is in a state of being thinner than the distance between the presser foot 3 and the blocking plate 6 in the blocking plate portion. Since it was not pressed down at all, it shook during sewing and made the quality of the sewn product unstable.

When the upper cloth W1 is thick, that is, when the upper cloth W1 is thicker than the distance between the presser foot 3 and the blocking plate, the upper cloth W1 is strongly pressed by the blocking plate regardless of the pressing pressure of the pressing foot 3. However, the inconvenience of not being able to feed the proper feed amount has occurred.

Further, since the sewing position of the cloth W is limited by the folded-back portion 6 a of the blocking plate 6, the cutting width of the cloth W by the cutting means 7 (see FIG. 2) installed near the presser foot 3 is increased. There was an inconvenience that it could not be taken.

On the other hand, in the case of the blocking plate composed of the fixing plate 7 shown in FIG. 5, the above-mentioned inconvenience occurs due to the thickness of the lower cloth W2, and the structure is complicated, resulting in a high cost. ..

[0016]

[Means for Solving the Problems]

 The presser foot device for pleat stitching according to the present invention has been made to solve the above-mentioned conventional problems.The presser foot device for pleat stitching is provided with a support installed on the upper surface of the presser foot and an upper part. An attempt is made to solve the above-mentioned conventional problems by supporting a movable body in a vertical direction on a support and providing a blocking plate for separating a lower cloth and an upper cloth between a presser foot and a first feed dog at a lower portion. Is.

[0017]

[Action]

 The presser foot device for pleat stitching according to the present invention cuts off the upper cloth from the first feed dog by a blocking plate movably supported in the vertical direction on the presser foot, regardless of the thickness of the cloth. Try to make proper sewing.

[0018]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals, and duplicate description will be omitted. 1 and 2 are views showing one embodiment of a presser device for pleat stitching according to the present invention.

In FIG. 1, P is a pin as a support member installed on the upper surface of the presser foot 3, and two pins are installed in this embodiment.

C is a blocking plate, and the blocking plate C is supported by a pin P on the upper side so as to be movable in the vertical direction, and the lower side is between the first feed dog 1 and the presser foot 3.

Note that Pa is a stopper plate provided above the pin P so that the blocking plate C does not come off from the pin P.

As shown in FIG. 2, the blocking plate C is installed so that the central portion (folding portion) Ca connecting the upper side and the lower side is located behind the female portion 7 of the cutting means.

The presser foot device for pleat stitching configured as described above changes the height position of the blocking plate C by changing the height position of the blocking plate C even if the thicknesses of the upper cloth W1 and the lower cloth W2 are changed at the time of sewing. The upper cloth W1 can be cut off from the first feed dog 1 without changing the pressure.

Further, the central portion (folding portion) Ca of the blocking plate C is positioned behind the female portion 7 of the cutting means, and the cloth W is cut before the cloth W is engaged with the central portion Ca. Since it is performed, the sewing position is not limited, that is, the cutting width of the cloth W can be freely set.

[0025]

[Effect of the device]

 As described above, the presser foot device for pleat stitches in the overlock sewing machine according to the present invention supports the blocking plate movably in the vertical direction and cuts the central portion connecting the upper and lower parts of the blocking plate. Since it is installed behind the female part of the means, the upper cloth can be cut off from the first feed dog regardless of the thickness of the upper cloth and the lower cloth, and proper seams can be formed. The sewing position of the cloth is not limited, and the cloth cutting width by the cutting means can be freely set.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a presser foot device for pleat sewing according to the present invention.

FIG. 2 is a front view showing the presser foot device for pleat sewing shown in FIG.

FIG. 3 is a side view showing a conventional presser foot for pleat sewing.

FIG. 4 is an explanatory view showing a conventional presser foot device for pleat sewing, which is provided with a blocking plate composed of a leaf spring whose upper part is fixed to a presser foot.

FIG. 5 is an explanatory view showing a conventional presser foot device for pleat sewing, which is provided with a blocking plate whose one end is fixed to a machine frame of a sewing machine.

[Explanation of symbols]

 1 1st feed dog 2 2nd feed dog 3 Presser foot A A pleat P Support C Blocking plate W1 Upper cloth W2 Lower cloth

Claims (2)

[Scope of utility model registration request] 1. A first cloth feed tooth having a large cloth feed amount and a second cloth feed tooth having a small cloth feed amount are provided, and sewing is performed while forming a pleats on the cloth by the difference in the feed amount of these two feed teeth. A presser foot device for pleat sewing in an overlock sewing machine, comprising a support body installed on the upper surface of the presser foot, and an upper support movably supported in the vertical direction, and a presser foot and first feed A presser foot device for pleat sewing in an overlock sewing machine, which is provided with a blocking plate for separating the lower cloth and the upper cloth between the teeth. 2. The over part according to claim 1, wherein the central part connecting the upper part and the lower part of the blocking plate is installed so as to be behind the female part of the cutting means installed in the overlock sewing machine. Presser foot device for pleats in lock sewing machines.