JPS64219Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a presser foot used in flat sewing machines such as lockstitch sewing machines, double chainstitch sewing machines, and interlock stitch sewing machines.

For knitted underwear, swimsuits, knitted outerwear, etc., the edges of the fabric sewn using an overlock sewing machine are reinforced without impairing the elasticity of the knitted material, and the quality of the fabric is improved by improving the feel of the garment. Open the fabric sewn with an overlock sewing machine using a two-needle double chainstitch sewing machine or an interlock stitch sewing machine, and then fold the edge part to the fabric side, or sew again on top of it without folding it down. A so-called cover stitch is often used.

For this reason, double chainstitch and interlock stitch machines generally have a seam guide equipped with a guide groove on the machine frame in front of the presser foot to guide the hem under the presser foot to hold the fabric in an open position. In addition, the edge part on the back side is passed through a guide groove and sent under the presser foot, and the edge part sent under the presser foot either falls to one side, the left or right, or it does not fall down and is sent under the presser foot. Well, it's starting to be sewn on. Whether or not to fold the edge hem, and if so, in which direction it should be folded, are determined by the preferences of the sewing worker, the intended use of the sewn product, and the type of knitted fabric, and a seam guide suitable for this is used. In other words, when the hemline on the back side of the sewing product is to be tilted to the left, the seam guide should be set so that the guide groove is to the right with respect to the needle, and when the hem is to be tilted to the right, the seam guide should be to the left, and the seam guide should not be tilted to the left. When overstitching is performed with the seam raised in the middle, a seam guide with a guide groove positioned between the needles is used.

As described above, generally a seam guide having a guide groove that is suited to the direction in which the edge overhang is tilted is used. However, as shown in Utility Model Publication No. 132665/1982, there is also a seam guide which is divided into left and right halves and each is attached to the sewing machine frame in an adjustable position, making it possible to change the position of the guide groove and even the width of the groove.

However, in any case, with only the above-mentioned seam guide, the direction in which the hem folding part will fall is unstable, not only for thick fabrics such as terry cloth, but also for thin fabrics such as cotton and jersey. It has a tendency to not fit into the seam formed by a two-needle double chainstitch sewing machine or a two-needle interlock stitch sewing machine, but to protrude from the seam, resulting in a deterioration in the quality of the product.

This idea is to provide a guide body whose mounting position can be adjusted in the direction perpendicular to the feeding direction on the front surface of the sloped part of the cloth feed side of the presser foot, and when overstitching is to be performed, the guide body is installed in a direction corresponding to the guide groove of the seam guide. After adjusting the installation position, when opening the fabric, place the concave or step part of the seam on the guide body, and work with the seam guide to guide the fabric under the presser foot, thereby removing the hemline. The direction is stabilized so that the part is always placed in the stitches formed by a two-needle double chainstitch sewing machine or a two-needle interlock stitch sewing machine.

The figure shows an embodiment in which the presser foot according to the present invention is used in a two-needle double chainstitch sewing machine, and a presser foot body 2 is tiltably attached to the lower end of a presser foot bar 1. An auxiliary presser foot 3 is attached to both sides of the presser foot so as to be slidable in the vertical direction, and is normally pressed against the throat plate 5 by a spring 4.
A mounting plate 8 is mounted on the presser foot main body 2 so that its position can be adjusted by a set screw 7 screwed into the main body 2 through a long hole 6 formed in a direction perpendicular to the feed direction. A guide body 9 bent more vertically downward is extended toward the throat plate 5 along the front surface of an inclined portion 10 on the cloth feeding side of the presser foot body 2. In the diagram, 12 is the sewing machine frame 13 in front of the presser foot.
The seam guide is attached to the seam guide, and is divided into left and right parts, each of which is fixed so that its position can be adjusted in a direction perpendicular to the feeding direction, so that the position and width of the guide groove 14 formed by both parts can be adjusted.

When overstitching is performed, the fabric is relatively thin, such as cotton or jersey, and the edge stitching is
As shown in the figure, when the seam guide 12 is to be tilted to the right, the seam guide 12 is positioned so that the guide groove 14 is located to the left of the center between the two needles 15. Then, the cloth W is opened by passing the edge part 16 through the groove 14, and
The guide body 9 is positioned so as to be in contact with the stepped portion 17 created by tilting the edge part 16 to the right side. When you drive the sewing machine as described above,
As shown, a double needle chain stitch 18 is formed over the hem 16. When turning the hemline part to the left side, reverse the above, move the seam guide 12 so that the guide groove 14 is located on the left side between both needles 15.
positioning. Then, cut the edge part 16 into the groove 1.
4 to open the cloth W, and apply the guide body 9 to the stepped portion created by tilting the hemlock portion 16 to the left.

When the fabric is relatively thick like terry cloth,
The seam guide 12 is adjusted and installed so that the guide groove 14 is located in the center between both needles 15 and has a groove width that corresponds to the thickness of the edge overhang. Then, the cloth W is opened by passing the edge part 20 through the groove 14, and the guide member 9 is placed so that the lower end is placed in the recess formed at the seam part.
(Figure 3). When the sewing machine is started, the hem 20 does not fall in either the left or right direction and is sewn into the double chain stitch with the two needles.

When cover stitching is not to be performed, the guide body together with the seam guide is removed from the presser foot body by tightening the set screw that attaches the mounting plate.

In the above embodiment, the seam guide is divided into left and right parts so that the position and width of the guide groove can be adjusted, but a conventional integrated seam guide with different guide groove positions and widths may be used. .

The presser foot of the present invention is constructed as described above, and when performing oversewing, the mounting position of the guide body is adjusted in accordance with the guide groove of the seam guide provided in front of the presser foot, and then the edges are overstitched. Open the fabric by passing the edge of the fabric through the guide groove of the seam guide.
The guide body is applied to the recess or stepped portion that occurs at the seam, and the seam guide works together to guide the fabric under the presser foot.The position and width of the guide groove of the seam guide can be changed, By adjusting the installation position of the guide, it is not only possible to perform oversewing with the edge hem turned to the left or right, or to either the left or right side, but also to sew the edge hem. The direction of the edge part is always stabilized so that it fits inside the seam, and the deterioration in product quality caused by the edge part protruding from the seam is eliminated.

Moreover, when overlay stitching is not to be performed, it can be easily removed and simple interlock stitching can be performed.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main parts of a two-needle double chainstitch sewing machine equipped with a presser foot according to the present invention, Figure 2 shows the state when oversewing relatively thin fabric, and Figure 3 shows the state when oversewing thick fabric. FIG. 1... Presser bar, 2... Presser foot body, 6... Long hole, 7... Set screw, 8... Mounting plate, 9... Guide body, 10... Inclined part, 12... Seam guide, 1
5...needle.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) After aligning the edges of the overlapped fabrics with the stitches using an edge stitch sewing machine, open the fabric W and fold the edge edges to the fabric side or without folding it. In a presser foot of a sewing machine used for overstitching to sew again from above, the edge of the seam guide 12 provided in front of the presser foot is applied to a recess or stepped portion that occurs at the seam of the open cloth W. Head part 1
A guide body 9 that guides the cloth under the presser foot in cooperation with the guide groove 14 that guides the presser foot 6 and 20 is attached to the front surface of the inclined part on the cloth feeding side of the presser foot so that its position can be adjusted in a direction perpendicular to the cloth feeding direction. Sewing machine presser foot. (2) The presser foot for a sewing machine according to claim 1, wherein the seam guide is divided into left and right parts, and the mounting positions of the seam guides can be adjusted in directions perpendicular to the feed direction.