JPH0666576U - Sewing machine presser foot - Google Patents

Abstract

(57) [Abstract] [Purpose] The path between the two presser feet that are branched in parallel to the left and right of the presser foot is used as the path, and the two edges of the cloth that are abutted are raised in a convex shape to the path After passing through, cut the rising part of the cloth edge to a certain height with a knife provided on the presser foot, and then tilt it so that one cloth edge overlaps with the other cloth edge,
In the presser foot used in the sewing machine in which the flat stitches are performed on the overlapped portion, the front and rear shifts of the two cloths and the seam clogging by the cloth thickness step portion are prevented. [Structure] A bottom portion of a presser foot opposite to a guide claw for tilting a cloth edge is cut out to widen a space between two bottom surfaces of the presser foot near the guide claw. In addition, the end of the bottom of the presser foot provided with the guide claw on the passage side is formed substantially linearly in the cloth feeding direction, and the bottom of the presser foot is made lower than the bottom of the other presser foot, and A knife was placed on the tip side of the presser foot to increase the distance from the knife to the needle hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a presser foot of a sewing machine, in which two cloth edges are overlapped with each other in a state of being butted against each other, and two cloths are spliced together while covering the overlapped portion with a flat stitch decorative stitch. Used for.

[0002]

[Prior art]

 A sewing machine of this type is shown in Japanese Utility Model Publication No. 59-34457. In this sewing machine, the two fabric edges are raised in a convex shape and the other parts are spread flat to the left and right, and the raised part is passed through the passage between the left and right presser feet of the presser foot of the sewing machine. While tilting the upper part of the rising part with a cutter attached to the presser foot to a certain height, tilt one fabric edge downward and the other fabric edge so that it overlaps with the upper side, I try to make decorative stitches.

In this sewing machine, while the raised fabric edges are cut and aligned at a constant height, one of the fabric edges is positioned below the other fabric edge by the guide slanted end face and the guide claw of the presser foot protruding toward the passage side. However, since the inclined guide end face imparts frictional resistance to the upper surface of the fabric, the fabric feed speed of one fabric edge becomes slow and the left and right fabrics are sewn. -When joining a fabric with a fabric thickness step sewn with an edging tape such as a binder like a crotch joint, the fabric thickness step is clogged in the passage narrowed by the inclined guide end face. There was a concern that it would end up.

[0004]

[Problems to be solved by the device]

 This invention is a sewing machine of the type described above, in which the cloths to be sewn together are smoothly sewn without causing the front and back of the cloths to be sewn relative to each other or the seam of the cloth thickness step portion to cause a sewn smoothly To provide a presser foot for obtaining

[0005]

[Means for Solving the Problems]

 This invention uses a path between the presser feet that are branched in parallel to the left and right and is fixed, and the receiving knife is fixed to the cloth feeding side from the needle hole of one presser foot and at a constant height from the bottom of the presser foot. Then, on the other presser foot, a movable knife that moves back and forth toward the receiving knife and cooperates with the receiving knife to cut the rising portion of the cloth edge that is passed through the passage to a uniform height is attached. One presser foot Above the bottom of the foot and on the needle hole side of the knife, a guide claw that gradually protrudes into the passage as it approaches the needle hole is provided, and a sewing machine presser with a cloth end pressing guide surface at the rear end of the passage. One feature of the gold is that the distance between the bottoms of the two presser feet at the guide claw installation part is wider than the other parts, and the bottom edge of the presser foot with the guide claws on the passage side is fed. In a straight line, Another feature is that a recess is provided at the end edge of the presser foot bottom portion facing the guide claw, and yet another feature is that the receiving knife and the movable knife are provided closer to the cloth feeding side than the center of the presser foot. , And the bottom of the other presser foot is set higher than the bottom of the presser foot with the guide claw.

[0006]

[Action]

 When two cloth edges are raised in the passage between the presser foot of the decorative sewing machine with this presser foot and the cloth is guided under the presser foot to operate the sewing machine, the receiving knife and the movable knife While the edges of the fabric edges are trimmed to a certain height by and, the two fabrics are pressed by the left and right presser feet and fed straight to the needle hole. One of the rising edges of the trimmed cloth edge is tilted to the recess side of the presser foot bottom by the guide claw, and the other rising edge is gradually moved to the recess side by the tilted rising edge, and the trailing edge of the passage is continued. At the end, the other fabric edge is overlapped by the fabric edge pressing guide surface on the previously collapsed fabric edge, and decorative sewing is applied to the overlapped portion.

In this presser foot, only the rising edge of the cloth edge is brought close to the concave portion of the presser foot, and the flat portion of the cloth has a wide space between the presser foot bottom portions, so that a sewing clogging occurs at the guide claw portion. In addition, if the inner edge of the foot of the presser foot with the guide claw is made almost straight, the fabric on the side affected by the guide claw will be guided straight and delayed or bent with respect to the other fabric. Without being fed, the left and right fabrics will not be sewn at the end of sewing.

Further, if a knife is provided on the tip side of the presser foot, the distance until the trimmed cloth edge reaches the needle hole can be lengthened, so the cloth edge can be gently tilted down with the guide claws. You can Also, if the bottom of the other presser foot is higher than the bottom of the presser foot with the guide claw, the lower fabric will be laid down first, so that the overlapping of the fabrics will be smoother. Become.

[0009]

【Example】

 The structure of an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a presser foot 1 is provided with two presser feet 2 and 3 which are branched in parallel to the left and right. A passage 5 extending toward the needle hole 4 is provided between the presser feet 2 and 3, and an auxiliary presser foot 8 that is pressed down by a spring 7 is loaded in the shank 6 as shown in FIG. The auxiliary presser foot 8 presses down the fabric edge which has passed through the passage 5 and sunk under the presser foot 1 to be overlapped. On the upper surface of one of the presser feet 2, a guide groove 9 for discharging the cloth chips cut by a knife, which will be described later, to the rear is formed obliquely rearward from the rear portion of the passage 5.

A groove 10 and a hole 11 are formed in each presser foot 2, 3 in the horizontal direction from the outer side surface toward the passage 5, and a receiving knife 12 is inserted into the groove 10 of one presser foot 2 from the outside. The blade tip is fixed in the passage by a suitable length, and the movable knife 13 is inserted into the hole 11 of the other presser foot 3 so as to face the knife 12, and reciprocates by a drive mechanism (not shown). In cooperation with the receiving knife 12, the rising edge of the cloth edge passing through the passage 5 is cut at a constant height.

Presser shoes 14 and 15 in which both ends of a leaf spring are bent and fixed to the presser foot 1 are put on the presser feet 2 and 3, respectively, and form the bottom of the presser foot. These are designed to be able to elastically press the cloth on the needle plate, which will be described later, and the pressing shoe 15 on the side of the movable knife 13 is formed by notching an arcuate concave portion 16 at the center of the inner end edge. In addition, the bottom surface is set to be slightly higher than the presser shoe 14 (see FIG. 5). On the other hand, the inner edge of the presser shoe 14 attached to the presser foot 2 side where the receiving knife 12 is provided has a shallow concave portion 17 in the central portion, but is generally straight from the front end to the rear end. There is.

Further, a cam-like portion that protrudes gradually into the passage 5 as it approaches the needle hole 4 is closer to the needle hole 4 than the fixed portion of the receiving knife 12 of the presser foot 2 as shown in FIGS. 3 and 4. Of the presser foot 2 is provided so as to be flush with the bulging guide surface 2a of the presser foot 2 and slightly above the bottom surface of the presser shoe 14, and the protrusion thereof is the recess 16 of the presser shoe 15. Is facing. The part of the presser foot 1 from the rear end of the passage 5 to the needle hole 4 has an arch-shaped guide surface 19 (see FIG. 7) on the bottom surface.

The presser foot 1 is used in combination with the needle plate 21 and the front and rear feed dogs 22 and 23 shown in FIG. 1, and the needle plate 21 has five rows in front of the needle holes 24 and rear rows. The four rows of feed dog holes 25 are formed, and the upper surface thereof has a right upper surface 26a corresponding to the presser shoe 15 higher than the left upper surface 26b. Similarly, the feed teeth 22 and 23 are also on the right row. 22a and 23a are higher than the left columns 22b and 23b.

To sew the edge portion of the cloth using the above-described four-needle sewing machine equipped with the presser foot, the needle plate and the feed dog, first press the presser foot 1 and raise the cloth W1. W2 is abutted from the left and right to raise the edge of the cloth in a convex shape as shown in Fig. 5, insert the rising parts e1 and e2 into the passage 5, and press the cloths WI and W2 on both sides of the rising part. After feeding it under -14 and 15 in the direction of arrow F in FIGS. 1 and 4, lower the presser foot 1.

Next, when the sewing machine is operated, the rising portions e1 and e2 are fed rearward in the passage 5 by the cloth feeding action of the feed dogs 22 and 23, and the rising portions are caused by the movable knife 13 and the receiving knife 12. The upper edge of is trimmed to a certain height. The guide claws 18 press the rising portion e1 toward the rising portion e2 side with the subsequent feeding of the cloth, and the rising portion e2 falls down, and the rising portion e2 is brought close to the concave portion 16 side of the presser shoe 15 as shown in FIG. The tip of the rising part e1 smoothly falls into the space S created by the retreat of the rising part e2, and the tip is extended flat. Then, when the rising portion e2 is sent to the end of the passage 5, the arch-shaped guide surface 19 of the presser foot 1 gradually tilts downward and presses it down as shown in FIG. Stacked on the extended e1. Then, as shown in FIG. 8, decorative sewing is performed on the overlapped portion with four sewing machine needles 28, and two cloths W1 and W2 are joined.

[0016]

[Effect of device]

 As described above, in the presser foot of the present invention, since the distance between the presser feet is wide in the portion where the cloth edge is laid down, sewing clogging due to thick material and shift of the left and right cloths are prevented, and the cloth edge is smoothly laid down. By using this presser foot, it is possible to obtain excellent sewn products.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a presser foot according to an embodiment of the present invention.

FIG. 2 is a perspective view of a presser foot, a needle plate, and a feed dog used in an embodiment of the present invention.

FIG. 3 is a bottom view showing the positional relationship between the presser foot of the presser foot of FIG. 1, a knife, and a guide claw.

FIG. 4 is a partial side view of the presser foot of FIG.

5 is an explanatory view of the operation of the AA cross section of FIG. 4;

FIG. 6 is an explanatory view of the operation of the BB cross section of FIG. 4;

FIG. 7 is an explanatory view of the operation in the CC cross section of FIG. 4;

FIG. 8 is an explanatory view of the operation of the DD cross section of FIG. 4;

[Explanation of symbols]

 2, 3 ... Presser foot 4 ... Needle hole 5 ... Passage 12 ... Receiving knife 13 ... Movable knife 14, 15 ... Presser shoe 16, 17 ... Recessed portion 18 ... -Guide claw 19 ... Guide surface e1, e2 ... Standing part W1, W2 ... Fabric

Claims (4)

[Scope of utility model registration request] 1. A path is defined between two presser feet that are branched to the left and right and arranged in parallel, and is received at a constant height from the bottom of the presser foot on the cloth feeding side with respect to the needle hole of one presser foot. A knife is fixed, and a movable knife is attached to the other presser foot, which moves back and forth toward the receiving knife and cooperates with the receiving knife to cut the rising portion of the cloth edge passed through the passage to a uniform height. A sewing machine is provided with a guide claw above the bottom of one of the pressers and closer to the needle hole than the knife to gradually protrude into the passage as it approaches the needle hole, and further has a cloth end pressing guide surface at the rear end of the passage. In the presser foot, the space between the bottom portions of the two presser feet at the guide claw installation portion is wider than that of the other portion, and the presser foot of the sewing machine. 2. The presser foot according to claim 1, wherein the bottom edge of the presser foot having the guide claw is formed to have a substantially linear shape in the cloth feed direction and the other presser foot is provided. A presser foot for a sewing machine, characterized in that a recess is provided on an edge of the foot facing the guide claw. 3. The presser foot for a sewing machine according to claim 1, wherein the receiving knife and the movable knife are provided closer to the cloth feeding side than the center of the presser foot. 4. The presser foot for a sewing machine according to claim 1, wherein the bottom of the other presser foot is set at a position higher than the bottom of the presser foot provided with the guide claw.