JPH07236787A - Sewing auxiliary device for sewing machine - Google Patents

Abstract

PURPOSE:To make the detaching device of a sewing auxiliary attachment to feed a bottom opening or sleeve opening of clothes being tucked into the needle position and a cloth pressing member simpler and to shorten an exchanging work time. CONSTITUTION:An engagement protrusion 5 is formed protruding in front of a cloth pressing member 1 and an engagement member 6 with a cylinder shape, of which inner shape is agreed with the section of the engagement protrusion, is set on attachments 3 and 4 respectively. Each attachment is made possible to be attached, detached and exchanged by the engagement of the engagement protrusion 5 and the engagement member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a sewing machine such as a flat stitch sewing machine, in which the hem around the garment and the edges of the fabric such as the cuffs are folded inward before the needle position and are sewn. The present invention also relates to a sewing auxiliary device for a sewing machine, which is used when sewing laces, tapes, or the like at the same time as sewing the edges.

[0002]

2. Description of the Related Art In a conventional flat stitch sewing machine, a stainless steel or brass plate is bent to form a plurality of trumpets as an attachment, which is used as an attachment device for sewing the hem and cuffs. For this reason, a predetermined trumpet is screwed to the bed (needle plate) of the sewing machine according to the change in sewing. In addition, a sewing auxiliary device that performs hem pulling sewing with an overlock sewing machine has, for example, as disclosed in Japanese Utility Model Publication No. 2-6920, at the front end of a cloth pressing member instead of the above trumpet. There are some types of attachments that have a structure so that they can be detached and used interchangeably.

[0003]

In the former case of the above-mentioned conventional sewing auxiliary device, most of the manufacturing of the trumpet is a manual work, requires skill, and since the steps such as sheet metal and welding are performed, the cost is high. However, there were various obstacles in production, such as the shape accuracy was difficult to keep constant, and it took days from ordering the product to delivering it, resulting in poor responsiveness to parts replenishment. Further, when attaching and detaching the attachment, tightening and loosening of the screw must be performed at a plurality of places, so that there is a disadvantage in use that it takes time to replace.

On the other hand, in the latter, the bearing portion is erected on the upper surface of the front portion of the cloth pressing member mounted on the lower end of the pressing rod, and the attachments having different auxiliary sewing structures are provided with the bearing portions. By attaching a shaft whose outer end is screwed, the attachment and detachment and replacement can be done freely, so it takes time to manufacture the bearing part and the screw shaft, resulting in high cost. There is a drawback. In addition, the attachment and detachment and replacement of the attachments require tightening and loosening of screws, which is troublesome.

Therefore, it is possible to improve the attaching / detaching means of the cloth pressing member and each attachment so that the cost can be reduced and the attaching / detaching can be done without any trouble.
This has been a problem to be solved in this type of device.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a front portion of a cloth pressing member with a projection for fitting with an attachment, for attaching a lace, for sewing a hem blind, and a tape. Each attachment having different sewing auxiliary structures such as for attachment has an inner surface that matches the cross-sectional shape of the fitting projection and is a tube that is detachably tightly fitted to the fitting projection. Provided is a sewing auxiliary device for a sewing machine, in which a fitting portion having a shape is provided, and the attachments are detachably attached to and replaceable with respect to the cloth pressing member.

Further, according to the present invention, the fitting protrusion is provided on the front portion of the cloth pressing member warping in a boat shape so as to be inclined along the cloth feeding direction, and the central upper surface of the tip end portion of the fitting projection is provided. It has small projections with curved front and back, and hooks are provided on both sides of the base end part to abut the insertion opening of the fitting portion, and the fitting portion of each attachment has a front edge of the insertion opening. Provide a fitting guide groove for the small projection on the back surface of the upper part, and provide a notch groove on the front side of the fitting guide groove to prevent the small projection that elastically passed through the inner surface of the fitting part from returning and come off. Due to
The fitting depth of the fitting part on each attachment side with respect to the fitting protrusion on the cloth pressing member side is regulated to be constant, and the fixing at the fitting position is sufficiently maintained, and in the cloth feed direction. It is possible to provide a detachable structure that is easily fitted along and is hard to come off.

Further, the present invention provides each of the attachments,
The fitting portion is provided on the upper surface, and the sewing auxiliary structure is formed in a U-shaped cross section with the bottom portion positioned on the right side of the cloth pressing member orthogonal to the cloth feeding direction, and opens along the left side of the cloth pressing member. By using the attachment having the cloth feed guide portion having the opening, it is possible to easily insert the cloth into the attachment and to smoothly turn back the edge of the cloth to be sewn.

Further, according to the present invention, as an attachment for assisting sewing, a partition plate part is provided at the bottom part of the U-shaped cross section for partitioning the cloth feed guide part into upper and lower parts, leaving a gap around which the cloth goes around. It is divided into an upper guide part having an opening and a lower guide part, and the upper edge of a vertical partition plate formed in an L-shaped cross section is connected to the back surface of the partition plate part, and the side surface of the lower guide part. Attachment for closing the left side of the cloth in the cloth feed direction, and the lower guide so that the cloth feed guide section is partitioned into an upper guide section and a lower guide section leaving a gap around the bottom of the U-shaped section for the cloth to wrap around. By providing a folding plate portion folded back from the left side surface of the portion, the attachment for hem blind sewing having the opening portion formed on the left side of the upper guide portion, and the upper and lower parts of the opening portion. A folding back closing portion is provided which is provided with folding back closing portions for closing the side surface and the lower left side surface, respectively, and which divides the inside of the guide portion into three upper and lower steps leaving a gap around which the cloth goes around at the bottom portion of the U-shaped section, and closing the lower left side surface. Is formed in a T-shape in cross section and is provided with a tape attachment attached to the lower left side of the opening.
According to the desired stitching, the cloth edge to be folded back can be positioned in the attachment, and the cloth can be smoothly supplied such as lace attachment, hem blind stitching and tape attachment to the needle position.

Further, according to the present invention, by integrally molding the fitting portion and the cloth feed guide portion of the respective attachments with a synthetic resin, the attachments are lighter in weight than the conventional trumpet, have uniform accuracy, and have a low production cost. It is intended to provide an attachment in which the distribution of the product is enhanced while reducing the value to several tenths.

[0011]

According to the present invention, since the fitting portion of each attachment having the inner surface whose cross-sectional shape matches, is attached to and detached from the fitting protrusion provided on the front portion of the cloth pressing member. By eliminating the use of bearings, screws and screw shafts, and simplifying the attachment / detachment method between the presser foot member and each attachment, productivity is improved in terms of manufacturing and sewing auxiliary equipment for sewing machines that is easy to use. Can be provided.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the present invention comprises a pressing member 1 and a plurality of attachments 2, 3, 4 each having a different sewing auxiliary structure. The cloth pressing member 1 has a fitting protrusion 5 having a rectangular cross section formed in a convex shape along the cloth feeding direction at a front portion which is inclined so that the front side thereof rises while warping in a boat shape, and each attachment 2, Reference numerals 3 and 4 each have a cylindrical fitting portion 6 whose inner surface has a cross-sectional shape that matches the cross-sectional shape of the fitting portion 5 at a common position. It can be used by exchanging it with any attachment.

For example, when using the attachment 2 for attaching a race, as shown in FIG. 2, the fitting portion 6 is used by being fitted into the fitting projection 5 from the front end of the cloth pressing member 1 and the fitting is performed. It can be exchanged for other attachments 3 and 4 by removing it. In addition, the attachment / detachment direction of the cloth pressing member and each attachment is not limited to the case where the cloth pressing member is attached along the cloth feeding direction, and may be the direction orthogonal to the cloth feeding. Also,
The cross-sectional shape is not limited to a rectangle.

The fitting projection 5 of the cloth pressing member 1 is provided with a small projection 7 having a curved front and back on the central upper surface of the tip end portion, and the insertion opening 8 of the fitting portion 6 is provided on both sides of the base end portion. A hooking portion 9 that contacts the edge is formed. The fitting portion 6 of each attachment is provided with a fitting guiding groove 10 on the upper back surface of the front edge of the insertion port 8 for guiding fitting with the small protrusion 7.
On the front side of 0, a small projection 7 that elastically passes through the inner surface of the fitting part
A cutout groove 11 is provided to reposition and prevent slipping out.

When the fitting projection 5 integral with the cloth pressing member 1 and the fitting section 6 of each attachment 2, 3, 4 are fitted, the fitting projection groove 10 is guided by the small projection 7 to a certain depth. After that, the small projection 7 is elastically passed through the inner surface of the fitting portion 6 after being tightly fitted, and the small projection 7 is inserted into the notch groove 11 at the fitting stop position where the insertion port 8 contacts the hook portion 9. By returning to the original position, the fitting depths of the attachments 2, 3, and 4 with respect to the cloth pressing member 1 are regulated so as to be constant, and the cloth pressing member 1 is firmly held at a predetermined position. In addition, the small protrusions 7 having front and rear surfaces formed into curved surfaces facilitate the insertion of the fitting protrusion 5 and the tubular fitting portion 6 having the same cross section. As described above, the attachment / detachment structure of the fitting protrusion 5 and the fitting portion 6 has a smooth attachment / detachment operation and is a structure that is easily fitted to each other and is hard to come off.

As shown in FIG. 1, each of the attachments used in this embodiment includes an attachment 2 for attaching a race,
It consists of an attachment 3 for hem blind stitching and an attachment 4 for tape attachment. The fitting portions 6 are provided at common positions on the upper surface of the attachment 3, and a bottom portion is provided on the right side of the cloth pressing member 1 at right angles to the cloth feeding direction. An opening 1 which is formed in a U-shaped cross section and is opened along the left side of the cloth pressing member 1.
It has a cloth feed guide portion 13 including 2. The attachments 2, 3 and 4 can be easily manufactured by using a synthetic resin one in which the fitting portion 6 with the fitting protrusion 5 of the cloth pressing member 1 and the cloth feed guide portion 13 are integrally molded. In addition, the weight is reduced and the shape is made uniform, so that it is suitable for distribution.

The attachment 2 for attaching the lace is shown in FIG.
As shown in (a) of FIG. 11, a partition plate portion 15 is provided at the bottom of the U-shaped cross section to partition the inside of the cloth feed guide portion into upper and lower parts, leaving a gap 14 around which the cloth wraps around.
It is partitioned into an upper guide portion 13a having the opening 12 and a lower guide portion 13b, and the upper edge of a vertical partition plate 16 having an L-shaped cross section is connected to the back surface of the partition plate portion 15. , The lower guide part 13 on its triangular side surface
The left side surface of b is closed in the cloth feed direction.

As shown in FIG. 3 (a), the cloth 17 (for example, the hem mouth portion) inserted from the left opening 12 has a U-shaped cross section at its edge. While being folded back along the inner surface of the portion 13, the cloth is fed forward, and together with the belt-shaped race 18 having the edge inserted into the upper surface of the vertical partition plate 16 until the needle position of the sewing machine is reached (Fig. As shown in a '), they are overlapped and sutured.

Attachment 3 for hem blind sewing
As shown in FIG. 4 (a), the inside of the cloth feed guide portion 13 is divided into an upper guide portion 13a and a lower guide portion 13b, leaving a gap 14 around which the cloth wraps around the bottom portion of the U-shape. The opening 12 is formed on the left side of the upper guide portion 13a by providing the folded-back plate portion 19 folded back from the left side surface of the lower guide portion 13b, and the left side surface of the lower guide portion 13b is moved in the cloth feeding direction. It is closed.

As shown in FIG. 4 (a), the cloth 17 (eg, hem and cuffs) inserted through the left opening 12 has a U-shaped cross section at its edge. While being folded back along the inner surface of the feed guide section 13, the cloth is fed to the needle position of the sewing machine, and as shown in FIG. Further, when using the attachment 3 for the hem blind, as shown in FIG. 4 (b), the edge of the cloth 17 is further folded back in the lower guide portion 13b, and then the attachment is made as shown in FIG. 4 (b '). As shown, it can be sutured by forming a triple folded state.

The attachment 4 for attaching the tape is shown in FIG.
As shown in (a) of FIG. 1, the cloth feed guide portion 1 is left with the gaps 14 at the bottom of the U-shaped cross section around which the cloth goes around.
A fold-back for partitioning the inside of 3 into upper and lower three sections, and providing a flat guide section 13c that forms the opening 12 on the left side between the lower guide section 13b and the upper guide section 13a and closing the left side surface of the lower guide section 13b. The closing portion 20 has a T-shaped cross section and extends to the left side of the lower surface of the opening 12.

The attachment 4 for attaching the tape is
As shown in FIG. 5 (a), the edge of the cloth 17 (for example, the hem mouth, the neckline and the portion for the front meeting) to be inserted into the flat surface guide portion 13c from the opening 12 on the left side is largely folded back to make it double. The folded back edge 17 'is inserted into the upper guide portion 13a, the edge of the cloth 17 connected to the folded back edge 17' is inserted into the lower guide portion 13b, and the cloth is fed, as shown in (a ') of FIG. Cloth that is folded in four by sewing
The edges of 7 are sutured.

The attachment 4 is shown in FIG. 5 (b).
As shown in FIG. 7, the cloth 17 is inserted along the plane guide portion 13c between the lower guide portion 13b and the upper guide portion 13a, and both sides of the tape 21 are folded in two, and one of the folded edge 21 ' Is inserted into the upper guide portion 13a and the other folded edge 21 "is inserted into the lower guide portion 13b, as shown in FIG. 5 (b ').
It is also possible to sew a tape 21 having double-folded both side edges on the front and back sides of the edge of the cloth 17.

When sewing the edges folded as described above or simultaneously sewing other band-shaped materials, the attachments 2, 3 and 4 are closed by the cloth feed guide portion 13.
The edge of the cloth or the folded edge can be guided to the needle position (not shown) under the condition that the edge of the cloth or the folded edge is in contact with the side of the cloth There is an advantage that it is possible to sew, and it is possible to perform edge sewing that is accurate and easy to feed the cloth.

In the figure, reference numeral 22 is a needle hole provided in the cloth pressing member 1. Further, in the cloth pressing member 1, a half-shaft shaft hole 25 at a lower portion of a pressing holder 24 is fitted to a shaft 23 which is laterally extended, and an operating lever 26 is pressed against a restoring spring (not shown). Is opened and the spring plate 27 connected to the lower end of the spring plate 27 is moved forward to be connected to a presser bar (not shown). The pressing member 1 is separated. The cloth pressing member used in the present invention is
A snap-on type is preferable because it is easy to attach and detach, but the present invention is not limited to this.

[0027]

As described above, according to the present invention, the fitting portion of each attachment having the inner surface of which the cross-sectional shape matches the fitting projection provided on the front portion of the cloth pressing member is attached and detached. Therefore, it is possible to omit the manufacturing of the trumpet like the above-mentioned conventional device and the adoption of the attaching / detaching means of the bearing, the screw and the screw shaft, and the attachment and the replacement of the attachment can be performed only by removing or inserting it in the fitting direction. By simplifying the attachment / detachment means so as to be possible, it is possible to provide a sewing auxiliary device for a sewing machine which improves productivity in terms of production and is easy to use in terms of use.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view when a lace attachment is attached to a cloth pressing member.

FIG. 3 is an explanatory view showing a usage state of a lace attachment and a sewing state thereof.

FIG. 4 is an explanatory view showing a usage state and a sewing state of the hem blind attachment.

FIG. 5 is an explanatory view showing a usage state and a sewing state of the tape attachment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cloth pressing member 2 Attachment for lace attachment 3 Attachment for hem blind 4 Attachment for tape attachment 5 Fitting protrusion 6 Fitting portion 7 Small projection 8 Insertion port 9 Engagement portion 10 Fitting guide groove 11 Notch groove 12 Opening 13 Cloth feed guide part 13a Upper guide part 13b Lower guide part 13c Plane guide part 14 Gap 15 Partition plate part 16 Vertical partition plate 17 Cloth 17 'Folding edge 18 Race 19 Folding plate part 20 Folding closing part 21 Tape 21' Folding end Edge 21 "Folded edge 22 Needle hole 23 Shaft 24 Presser holder 25 Shaft hole 26 Operation lever 27 Spring plate

Claims (5)

[Claims] 1. A front projection of a presser foot member (1) is provided with a fitting projection (5) for attachment, and is provided with different auxiliary sewing structures for lace attachment, hem blind stitching, tape attachment, etc. The attachments 2, 3 and 4 are provided with a cylindrical fitting portion 6 which has an inner surface matching the cross-sectional shape of the fitting projection 5 and which is detachably tightly fitted to the fitting projection. A sewing auxiliary device for a sewing machine, wherein the above-mentioned attachments are detachably attached to the cloth pressing member and can be exchanged. 2. The fitting protrusion 5 is provided in a front portion of the cloth pressing member 1 which is warped in a boat shape so as to be inclined along the cloth feeding direction, and has a front and rear curved surface formed on a central upper surface of the tip portion. Provided on both sides of the base end portion with hooks 9 for contacting the insertion opening 8 of the fitting portion 6. The fitting portion 6 of each attachment has a front edge of the insertion opening 8. A fitting guide groove 10 for fitting with the small projection 7 is provided on the back surface of the upper part, and a notch groove 11 is provided on the front side of the fitting guide groove for returning the small projection elastically passing through the inner surface of the fitting portion to prevent the small projection from coming off. 2. The sewing auxiliary device for the sewing machine according to claim 1, further comprising: 3. The attachments 2, 3, 4 are provided with the fitting portion 6 on the upper surface thereof, and the bottom portion is located on the right side of the cloth pressing member 1 orthogonal to the cloth feeding direction as the sewing auxiliary structure. The sewing auxiliary device for a sewing machine according to claim 1, further comprising a cloth feed guide portion (13) having a U-shaped cross section and having an opening (12) opening along the left side of the cloth pressing member (1). 4. Each of the attachments 2, 3 and 4 is provided with a partition plate part 15 for partitioning the inside of the cloth feed guide part into upper and lower parts leaving a gap 14 around which the cloth turns around at the bottom part of the U-shaped section.
The partition plate portion divides the upper guide portion 13a and the lower guide portion 13b having the opening 12 into upper and lower portions of the vertical partition plate 16 having an L-shaped cross section. Inside the cloth feed guide part, there is an attachment 2 for connecting to the back surface, the left side surface of the lower guide part 13b of which is closed in the cloth feed direction at the side surface thereof, and a gap 14 around which the cloth goes around at the bottom of the U-shaped section. The folded back plate portion 19 folded back from the left side surface of the lower guide portion so as to partition the upper guide portion 13a and the lower guide portion 13b.
And an attachment for hem blind stitching in which the opening 12 is formed on the left side of the upper guide portion, and folded back closing portions 20, 20 for closing the upper left side surface and the lower left side surface above and below the opening portion 12, respectively. Is provided to partition the inside of the guide portion into three upper and lower portions, leaving a gap 14 around which the cloth wraps around the bottom portion of the U-shaped section, and a folded back closing portion 20 for closing the lower left side surface is formed in the T-shaped section and the opening is formed. 4. A sewing auxiliary device for a sewing machine according to claim 3, further comprising a tape attachment attached to the lower left side of the section. 5. The sewing auxiliary for a sewing machine according to claim 3, wherein each of the attachments 2, 3 and 4 is formed by integrally molding the fitting portion 6 and the cloth feed guide portion 13 with a synthetic resin. apparatus.