JP2002085873A - Presser bar for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a presser bar for a fabric capable of smoothly sewing the fabric without partially dislocating the downside of the fabric to be sewn or without any stopping stitches. SOLUTION: In the presser for sewing machine, a receiving knife 12 is fixed to one presser foot 2, a movable knife 13 moving back and forth from/to the receiving knife and cutting the erecting part of a fabric edge passed through a passage 5 equally at a fixed height while being cooperated with the receiving knife is attached to another presser foot 3, a guide pawl 2a to be protruded inside the passage as getting nearer to the needle hole is arranged above the bottom of one presser foot and on the side of a needle hole rather than the knife, a fabric guide bar extending in a fabric feeding direction toward the passage and having a vertical guide plane is located on a sewing machine bed, and a fabric end presser guide plane is provided on the rear end of the passage. In the presser, an auxiliary guide tool (leaf spring) 19 is installed on the presser foot on the side provided with the guide pawl, the fabric edge between the presser foot on the side provided with the guide pawl and the fabric guide bar is pressed to the fabric guide bar, the bottom of the presser foot facing the protrusion of the guide pawl is recessed to keep the width thereof up to the fabric end pressing guide plane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot for a sewing machine, and superimposes two cloth edges while abutting each other on the edges thereof. Used for sewing machines that are joined together.

[0002]

2. Description of the Related Art This type of sewing machine is disclosed in Japanese Utility Model Publication No. 59-3445.
No. 7 discloses this. In this sewing machine, as a preparation before sewing, the two cloth edges are raised in an upwardly convex shape, the other part is spread out flat to the left and right, and the presser foot of the sewing machine is inserted into the passage between the presser feet which is branched right and left. The raised part is set, and the other part is elastically pressed by the presser shoe attached to the presser foot. Then, while trimming the upper part of the rising part to a certain height with a scalpel provided on the presser foot, lay one fabric edge flat and the other fabric edge on top of it, and decorate the overlapped part I try to sew. As a result, the two cloths are joined together. In this sewing machine, a cloth guide bar extending into the passage is provided. This cloth guide bar vertically supports the rising edge of the cloth edge so that it can be trimmed to a fixed height with a scalpel.

[0003]

However, in the conventional sewing machine, if there is an extra gap between the presser foot and the cloth guide rod, the rising portion of the lower left cloth edge is particularly irregularly curved. In some cases, the lower fabric edge is cut off from the seam during sewing. In particular, soft cloth is sucked into the suction port of the dust collector provided near the presser foot,
The problem was frequent. In addition, there has been a problem that the cloth edge partially protruding from the seam is caught by the cloth end presser guide surface provided at the bottom of the presser foot or at the rear end of the passage, and there is a problem that sewing occurs on the left and right cloths.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sewing machine as described above, in which a presser foot which can be sewn smoothly without a part of a lower side of a fabric to be seamed partially protruding from a seam or causing a seam jam. Is to provide.

[0005]

According to a first aspect of the present invention, a path is provided between two presser feet which are branched in the left and right direction and arranged in parallel, a receiving knife is fixed to one of the presser feet, and the other is fixed. A movable knife that moves back and forth toward the receiving knife and cooperates with the receiving knife to trim the rising portion of the cloth edge passed through the passage to a fixed height is attached to the presser foot, and one of the presser foot bottoms A guide claw that protrudes gradually into the passage as it approaches the needle hole above the scalpel and closer to the needle hole than the scalpel, and further includes a cloth guide rod extending in the cloth feed direction toward the path and having a vertical guide surface. In the presser foot of the sewing machine that is disposed on the sewing machine bed and has a cloth end presser guide surface at the rear end of the passage, an auxiliary guide tool made of a leaf spring is installed on the presser foot on the side where the guide nail is provided, and the guide nail is provided. Between the presser foot on the side While as against the cloth guide bar the cloth edge, characterized in that the width so as to maintain up to the fabric edge presser guide surface by depressing the bottom of the presser foot which faces the protruding guide claws.

[0006] In particular, it is desirable that the cloth guide rod and the auxiliary guide can be adjusted horizontally in a direction perpendicular to the cloth feeding direction.

[0007]

According to the present invention, prior to sewing, two fabric edges are raised in the passage between the presser feet, and the fabric is guided under the presser feet. Then, when the sewing machine is operated, the rising edge of the cloth edge is passed through the receiving knife and the movable knife while being trimmed to a certain height.
At this time, the rising portion of the lower fabric edge is pressed by the fabric guide bar by the auxiliary guide and is supported vertically,
The upper ends of the rising portions of both cloth edges are cut in a state where the movable knife has moved to fall on the receiving knife side. One of the edges of the cloth trimmed to a certain height is flattened down by the guide claw,
The other falls over. The overlapped fabric edge passes under the needle hole and is sewn, and then pressed by the fabric edge pressing guide surface. After the cutting edge of the cloth is cut by the receiving knife and the movable knife, the presser foot bottom facing the projection of the guide claw is depressed, so that the rising part of the lower cloth edge is not particularly caught by the presser foot bottom. It is slid smoothly and fed to the needle hole or the cloth end guide surface. By adjusting the position of the cloth guide bar and the auxiliary guide horizontally along the direction perpendicular to the cloth feeding direction, the lower cloth edge of the spliced cloth can be stably protruded from the seam or vice versa. The stitch can be stably stored.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of the present invention. The presser foot 1 includes two presser feet 2 and 3 which are branched in the left and right directions and arranged in parallel so that a passage 5 extending toward the needle hole 4 is formed. An auxiliary presser foot 8 that is pressed down by a spring 7 is mounted in the shank 6. The auxiliary presser foot 8 has a cloth end press guide surface 8a. The cloth end press guide surface 8a is engaged with a portion of the cloth edge that has passed below the needle hole 4 through the passage 5 from above, and the cloth presser guide surface 8a The edge portion is pressed against the needle plate 20 of the sewing machine. A guide groove 9 is formed on the upper surface of one of the presser feet 2 to discharge backward a piece of cloth cut by a scalpel. This guide groove 9
The cloth is formed obliquely from the rear of the passage 5 so that the chips of the cloth do not go above the needle hole 4.

A groove is formed in each of the presser feet 2 and 3 in the horizontal direction from the outer wall surface toward the passage 5. A receiving knife 12 is fixed to the groove of one presser foot. This receiving knife 1
The second cutting edge protrudes into the passage 5 as appropriate. A movable knife 13 that reciprocates by a known drive mechanism (not shown) is arranged in the groove of the other presser foot. By the cooperation of the scalpels 12 and 13, the rising portion of the cloth edge passing through the passage 5 is trimmed at a constant height.

The bottoms of the presser feet 2 and 3 are formed by presser shoes 14 and 15 having both ends of a leaf spring bent. A guide claw 2a is arranged above one of the holding shoes 14. The guide claw 2 a is located closer to the needle hole 4 than the knives 12 and 13, and is fixed to the presser foot 2 with a screw 2 b. The guide claw 2a gradually protrudes into the passage 5 as approaching the needle hole 4, and the degree of protrusion can be adjusted in the elongated hole 2c formed in the guide claw 2a when the screw 2b is relaxed. Has become. The adjustment of the degree of protrusion is for responding to the thickness of the fabric. As shown in FIG. 2, the holding shoes 14 and 15 are fixed by screws 16 and 17 disposed in front of the holding feet 2 and 3. The presser shoe 15 facing the protrusion of the guide claw 2a is recessed in a horizontal direction orthogonal to the cloth feeding direction F, and its width is maintained up to the cloth end presser guide surface 8a of the auxiliary presser foot 8.

On the other hand, a sewing machine bed B on the near side of the presser foot 1
As shown in FIG. 3, the cloth guide rod 18 is fixed with a screw 18c. The cloth guide rod 18 has vertical guide surfaces 18a and 18b, and its fixing position is a screw 18
By adjusting the inside of the long hole 18d when c is relaxed, it is possible to move in the horizontal direction orthogonal to the cloth feeding direction F. The cloth guide rod 18 extends along the cloth feeding direction F to below the working portion of both knives 12 and 13, and its tip is slightly right curved below the working portion of both knives. An auxiliary guide 19 is installed on the presser foot 2 on the side where the guide claw 2a is provided. The auxiliary guide 19 is made of a leaf spring, and its tip is urged against the guide surface 18a of the cloth guide rod 18. The fixing position of the auxiliary guide 19 can be adjusted in the elongated hole 19a when the screw 16 is loosened, so that the auxiliary guide 19 can be moved in the horizontal direction orthogonal to the cloth feeding direction F. With this auxiliary guide 19, the cloth edge between the presser foot 2 on which the guide claw 2a is provided and the cloth guide rod 18 is pressed against the cloth guide rod 18.

The operation of the presser foot of the sewing machine described above will be described. First, the presser foot 1 is separated from the known needle plate 20 provided on the sewing machine. Next, the two cloths W1 and W2, which are raised from the left and right, are fed between the presser foot and the needle plate. Then, after the rising portions e1, e2 of the fabrics W1, W2 are arranged in the passage 5, the presser foot 1 is lowered, and the fabric is set. Cloth W set
1 and W2 are elastically pressed against the needle plate 20 by the presser shoes 14 and 15 of the presser foot 1.

When the sewing machine is driven in this state, the rising portions e1 and e2 are fed into the passage 5 along the cloth feeding direction F by a known feed dog (not shown) provided on the sewing machine. At this time, as shown in FIG. 4, the rising portion e1 of the lower edge of the cloth is particularly pressed against the guide surface 18a of the cloth guide rod 18 by the auxiliary guide 19 and is supported vertically. At the time of subsequent cloth feeding, the upper ends of both rising portions e1 and e2 of the movable knife 13 and the receiving knife 12 are trimmed to a fixed height. At this time, the upper ends of both rising portions e1 and e2 are, as shown in FIG.
By the movement of No. 3, it is cut in a state where it is tilted to the receiving knife 12 side.

Thereafter, the rising portion e1 is tilted toward the rising portion e2, and the rising portion e2 is laid on the flatly extending rising portion e1. Then, decorative sewing by the sewing machine is performed on the overlapped portion, and the two fabrics W1 and W2 are joined. The spliced fabrics W1 and W2 pass through the auxiliary presser foot 8 while maintaining the flatness by the fabric end guide surface 8a. After the cutting of the cloth edge by the scalpels 12, 13, the pressing shoe 15 facing the protrusion of the guide claw 2a is depressed, so that the rising portion e1 of the lower cloth edge can be held by the pressing shoe 15 in particular. Needle hole or auxiliary presser foot 8
To the cloth end guide surface 8a.

Before the sewing, the cloth guide rod 18 is
And the auxiliary guide 19 are horizontally adjusted along a direction orthogonal to the cloth feeding direction, so that the relative positions of the knives 12 and 13 with respect to the cutting positions are changed. With this change, the cut lengths of both cloth edge rising portions e1 and e2 are changed, and the lower cloth edge of the spliced fabric stably protrudes from the seam or is stably stored in the seam. Or will be.

[0016]

As described above, according to the present invention, when the movable knife moves toward the receiving knife, the rising portion of the lower cloth edge is pinched by the auxiliary guide and the cloth guide rod. Due to the forced bending, the rising portion can be trimmed to a certain height, so that the lower fabric edge of the spliced fabric does not partially protrude from the seam. it can. In addition, after the cutting edge of the cloth is cut by the receiving knife and the movable knife, the presser foot bottom portion facing the projection of the guide claw is depressed, so that the rising portion of the lower cloth edge can be held by the presser foot sole portion. It can be fed smoothly to the needle hole or the cloth end guide surface without any trouble. The lower fabric edge of the spliced fabric can be stably protruded from the seam or, conversely, can be stably stored in the seam, so that the appearance as a sewn product is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a presser foot of a sewing machine applied to the present invention.

FIG. 2 is a schematic bottom view showing a main part of a presser foot of the sewing machine.

FIG. 3 is a schematic plan view showing a presser foot of the sewing machine and the vicinity thereof;

FIG. 4 is a partial cross-sectional view illustrating a cloth set on the sewing machine according to the first embodiment;

FIG. 5 is a partial cross-sectional view illustrating a cloth set on the sewing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Presser foot 2 Presser foot 2a Guide claw 4 Needle hole 5 Passage 12 Receiving knife 13 Movable knife 14, 15 Pressing shoe (foot bottom of foot) 18 Cloth guide rod 19 Auxiliary guide e1, e2 Rising section B Sewing bed W1, W2 Fabric

Claims (2)

[Claims] A passage is provided between two presser feet that are branched in the left and right direction and arranged in parallel, a receiving knife is fixed to one of the presser feet, and the other presser foot advances and retreats toward the receiving knife. A movable scalpel for trimming the rising portion of the cloth edge passed through the passage to a predetermined height in cooperation with the scalpel is attached, and a needle hole is provided above one presser foot sole and on the needle hole side of the scalpel. A guide claw is provided to gradually protrude into the passage as approaching, and a cloth guide rod extending in the cloth feeding direction toward the passage and having a vertical guide surface is arranged on the sewing machine bed. In a presser foot of a sewing machine having a presser guide surface, an auxiliary guide device made of a leaf spring is installed on a presser foot on a side where a guide claw is provided, and between a presser foot on a side where a guide claw is provided and the cloth guide bar. Press the fabric edge of the fabric against the fabric guide bar. A presser foot of a sewing machine, characterized in that a bottom of a presser foot opposed to an extension of a guide claw is depressed to maintain its width up to a cloth end presser guide surface. 2. The cloth guide bar and the auxiliary guide can be adjusted horizontally in a direction perpendicular to the cloth feeding direction.
Sewing foot of the described sewing machine.