JP2008023165A - Presser foot metal fitting of sewing machine, and presser foot set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a presser foot metal fitting of a sewing machine and a presser foot set for sewing without deteriorating the stretchability of a stretchable fabric. <P>SOLUTION: The presser foot metal fitting 1, which constitutes the presser foot set together with a needle plate having a first needle hole 10, includes a presser member 4 having a second needle hole 10, and a pair of auxiliary presser members 6A and 6B are mounted on the left and right sides of the presser member 4 in such a way as movable in the vertical direction. A roll body 13 turnable around a horizontal shaft 12, is laid between the auxiliary presser members 6A and 6B at an upstream position in the feeding direction (indicated by an arrow W) from the second needle hole 10, and the roll body 13 is disposed so that the lower end on the outer peripheral surface of the roll body 13 is located lower than the lower surfaces of the auxiliary presser members 6A and 6B. Coil springs are interposed between the presser member 4 and the respective auxiliary presser members 6A and 6B for energizing the auxiliary presser members 6A and 6B downward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sewing machine presser fitting and a presser set that are suitable for sewing elastic fabrics that are frequently used in recent years.

  In a general sewing machine, the sewing needle and the presser foot are lowered when the fabric placed on the needle plate is sewn, and the feed member protruding and retracting from the feed guide groove of the needle plate ties the fabric with the lower surface of the presser foot. The fabric is fed by a certain amount while being pinched, and the fabric retainer is lowered to press the fabric against the needle plate, and the sewing needle sews the fabric in this state. Such a cloth presser fitting for a sewing machine is described, for example, in Patent Document 1 below.

Japanese Patent Laid-Open No. 11-226282 (FIG. 1 and others)

  By the way, the conventional sewing machine has mainly sewed a small stretch fabric. On the other hand, in recent years, fabrics rich in stretchability are being frequently used for clothes. Therefore, when a stretchable fabric was sewn with the sewing machine disclosed in Patent Document 1, a normal seam F was formed on the fabric S as shown in FIG. When the position S of the fabric S sewn in this way is held with one hand and the position E is held with the other hand and pulled in the stitch direction, the fabric S itself is still stretched, but the stitch F The portion of the position E was extended only up to the position Ea. Thus, when there is little elongation of the fabric S, the elongation characteristic peculiar to the fabric will not be utilized.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a presser foot fitting and a presser foot set for a sewing machine that can be sewn without impairing the stretch characteristics of a stretchable fabric.

  In order to achieve the above object, a cloth presser fitting for a sewing machine according to the present invention presses a cloth on a needle plate close to the upper surface of a needle plate having a first needle passage hole and has a second needle passage hole. A presser foot bracket provided with a member, wherein a pair of auxiliary presser members are provided on both left and right sides of the presser member so as to be movable up and down, and the pair of auxiliary presser members at a position upstream of the second needle through hole of the presser member in the cloth feed direction. A roll body rotatable around a horizontal axis orthogonal to the cloth feeding direction is installed between the auxiliary presser members, and the lower end of the outer peripheral surface of the roll body is positioned below the lower surfaces of the pair of auxiliary presser members. Thus, the roll body is arranged, and an elastic member for biasing each auxiliary presser member downward is provided between at least the front end portion of the pair of auxiliary presser members and the presser member.

  Moreover, in the said structure, the lower surface around the 2nd needle penetration hole in a presser member is formed as a step part which protrudes below rather than the lower surface of the cloth feed direction downstream of a 2nd needle penetration hole.

  The presser foot set according to the present invention has the above-described presser foot fitting and the upstream position of the first needle passage hole in the cloth feed direction, and the upper surface position facing the roll body of the lowered presser foot fitting. And a needle plate having a recess which is formed to be depressed downward and accommodates the roll body.

  According to the presser foot bracket and the presser foot set of the sewing machine according to the present invention, at the time of sewing, the roll body of the presser foot lowering member enters the recess of the needle plate, and the fabric is bent between the roll body and the recess. Therefore, an appropriate feeding resistance is applied to the fabric during the fabric feeding operation by the feeding member of the sewing machine, and the fabric between the roll body and the concave portion and the feeding member is stretched, and is sewn with the sewing needle in the stretched state. Therefore, a large loop stitch can be formed on the fabric. Thereby, the stretch of the fabric in the stitch direction regulated by the stretch of the stitch can be increased, and the stretch characteristics of the stretchable fabric can be effectively extracted. In addition, the roll body of the presser foot clamp is installed between a pair of auxiliary presser members provided on the left and right sides of the presser member so as to be movable up and down, and the auxiliary presser member is interposed between the presser member and the auxiliary presser member. Since the elastic members for biasing the members downward are respectively provided, the time during which the fabric is clamped between the descending presser foot fitting and the needle plate becomes longer due to the elastic movement of the auxiliary presser member. Large loop seams can be formed to further increase fabric stretch. In addition, the presser foot of the fabric becomes soft and beautiful sewing is realized. Further, when the fabric retainer is raised and the fabric is fed, the roll body rolls on the fabric to smoothly feed the fabric.

  When the lower surface of the presser member around the second needle passage hole is formed as a step portion projecting downward from the lower surface of the second needle passage hole on the downstream side in the cloth feeding direction, this step portion is formed by the second needle passage hole. Since the fabric is sewn with the fabric around the hole pressed onto the needle plate, the fabric in the vicinity of the seam is less likely to swell. Incidentally, when sewing with a plurality of sewing needles, the gap between the stitches is flat and the appearance is improved.

The best mode for carrying out the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention. Here, FIG. 1 is an external view showing a cloth retainer of a sewing machine according to an embodiment of the present invention, FIG. 2 is a side view of the cloth retainer, FIG. 3 is a bottom view of the cloth retainer, and FIG. It is the components figure which decomposed | disassembled the cloth clamp and was seen from the left side surface.
In each figure, a presser foot fitting 1 according to this embodiment includes a holder 3 fixed to a vertical drive shaft 2 of a sewing machine, and a swingable vertical movement via a pivot shaft 5 at a front lower portion of the holder 3 (in FIG. 4). And a presser member 4 for pressering the fabric supported by the presser E).
As a sewing machine using this cloth presser fitting 1, here, a three-needle flat stitch sewing machine capable of attaching a maximum of three sewing needles will be described as an example. In order to pass the three sewing needles, three second needle through holes 10, 10, 10 are formed side by side in the substantially central portion of the presser member 4. However, the sewing machine of the present invention includes a form in which only one, two, or all three sewing needles are used.

  On both sides of the rear portion of the presser member 4, projecting portions 4 d and 4 d are formed with the upper portion projecting leftward and rightward from the lower portion. In these projecting portions 4d and 4d, longitudinal guide grooves 14 and 14 are formed so as to be indented in the left and right directions, respectively. Female screw holes 38 are formed on the side surface of each overhang portion 4d. The side surfaces of the overhang portions 4d, 4d are covered with side covers 35, 35 that can swing back and forth (see arrow D in FIG. 4) via pivot shafts 36, 36, respectively. Each side cover 35 is fixed to the side surface of each overhanging portion 4d by screwing male screws 37, 37 passed through its own through holes 39, 39 into the female screw holes 38, 38.

  A pair of auxiliary pressing members 6 </ b> A and 6 </ b> B are provided along the left and right sides of the pressing member 4. The auxiliary presser members 6A and 6B have sliding shaft portions 7A and 7B that are erected on the rear portion of a leg that is long in the front-rear direction. Since these sliding shaft portions 7A and 7B can slide in the guide grooves 14 and 14 of the pressing member 4, the auxiliary pressing members 6A and 6B can move up and down with respect to the pressing member 4. Locking pins 42 and 42 projecting inwardly on the upper inner surfaces of the sliding shaft portions 7A and 7B are hooked on the upper surfaces of the projecting portions 4d and 4d to prevent the guide grooves 14 and 14 from coming off. Has been. Further, the auxiliary presser members 6A and 6B are prevented from falling off from the presser member 4 outwardly by the rear portions of the auxiliary presser members 6A and 6B being slidably covered by the side covers 35 and 35 described above.

Support holes 41, 41 are formed on the inner side surfaces of the auxiliary presser members 6 </ b> A, 6 </ b> B upstream of the second needle passage hole 10 of the presser member 4 in the cloth feeding direction. These support holes 41, 41 span a horizontal axis 12 in a direction perpendicular to the cloth feeding direction (arrow W in FIG. 3). Note that both ends of the horizontal shaft 12 are mounted in the support holes 41, 41 in a loose fit. Thereby, even when the heights of the auxiliary presser members 6A and 6B change, the horizontal shaft 12 can move in the support holes 41 and 41, and can tilt with respect to the auxiliary presser members 6A and 6B ( FIG. 11). The roll body 13 is formed in a columnar shape and has a shaft hole 9 penetrating the roll axis. The roll body 13 is rotatable about the axis of the horizontal shaft 12 by the shaft hole 9 being slidably fitted to the horizontal shaft 12.
In addition, the drilling positions of the support holes 41, 41 in the auxiliary pressing members 6 </ b> A, 6 </ b> B are such that when both ends of the horizontal shaft 12 passed through the shaft hole 9 of the roll body 13 are attached to the support holes 41, 41 13 is set at a height position such that the lower end of the outer peripheral surface protrudes downward by, for example, about 1.5 mm from the lower surfaces of the auxiliary pressing members 6A and 6B.

A storage portion 11 for retractably storing the roll body 13 is formed in an upwardly recessed manner at a position upstream of the second needle through holes 10, 10, 10 on the lower surface of the presser member 4 in the cloth feeding direction. . That is, the storage portion 11 is formed at a position facing the support holes 41, 41 of the auxiliary presser members 6 </ b> A, 6 </ b> B mounted at a specified position on the side surface of the presser member 4.
The periphery of the second needle passage holes 10, 10, 10 on the lower surface of the presser member 4 is 0.1 ± 0 below the lower surface 4c on the downstream side in the cloth feeding direction of the second needle passage holes 10, 10, 10. It is formed as a stepped portion 4b protruding about 0.05 mm. Further, the front end portion of the lower surface 4c is a recessed portion 43 that is inclined forward and upward.

  Mounting holes 31 and 31 for receiving and supporting lower portions of coil springs 32 and 32 (an example of an elastic member) are formed on the upper surfaces of the front end portions 6a and 6a of the auxiliary pressing members 6A and 6B. On the other hand, the front portion 4a of the pressing member 4 is formed in a T-shape in front view with the left and right side portions projecting outward, and the upper portions of the coil springs 32 and 32 are accommodated and supported on the lower surface of the left and right projecting portions. Mounting holes 31, 31 are formed. In this manner, the coil springs 32, 32 for biasing the auxiliary presser members 6A, 6B downward are interposed between the front end portions 6a, 6a of the auxiliary presser members 6A, 6B and the front portion 4a of the presser member 4. The

  At the upstream positions of the left and right guide grooves 14, 14 in the cloth feed direction of the overhang portions 4 d, 4 d of the presser member 4, mounting holes 33, 33 that are recessed upward from the lower surface of the overhang portions 4 d, 4 d are formed. ing. Coil springs 34 and 34 are accommodated in the mounting holes 33 and 33. The lower ends of the coil springs 34 and 34 are supported on the upper surfaces of the auxiliary pressing members 6A and 6B attached to the specified positions on both side surfaces of the pressing member 4. Accordingly, the coil springs 34 and 34 also elastically bias the auxiliary pressing members 6A and 6B downward.

  On the other hand, as shown in FIG. 5, the needle plate 20 has three first needle holes 21, 21, 21 formed side by side. These first needle through holes 21, 21, 21 are the second needle through holes of the presser foot 1 that are close to each other from above in a state where the needle plate 20 is attached to a predetermined position of the sewing machine body 26 (see FIG. 6). 10, 10 and 10 are arranged so as to face each other, and the sewing needle passes through the second needle through hole 10 and the first needle through hole 21 in series from above the presser member 4. Then, on the upstream side of the first needle through-holes 21, 21, 21 in the needle plate 20 in the cloth feeding direction (arrow W direction), two feed guide grooves 23, 23 penetrating vertically are formed along the cloth feeding direction. In addition, two feed guide grooves 24 and 24 penetrating vertically also on the downstream side of the first needle through holes 21, 21, 21 in the cloth feeding direction are formed along the cloth feeding direction. On the left and right sides of the first needle through holes 21, 21, 21, feed guide grooves 23, 23, and feed guide grooves 24, 24, long feed guide grooves 22, 22 penetrating vertically are provided along the cloth feed direction. Is formed.

  In the needle plate 20, the position facing the roll body 13 of the lowered fabric retainer 1 at a position immediately upstream of the first needle through holes 21, 21, 21 in the cloth feeding direction (for example, the first needle through holes On the upper surface 20A upstream from (21 mm before 21, 21, 21), a recess 25 is formed so as to be depressed downward (for example, about 2 mm in depth). The needle plate 20 is installed on the upper surface of the sewing machine main body 26 of the sewing machine M and fixed with screws or the like (see FIG. 6). The needle plate 20 and the cloth presser metal fitting 1 constitute a cloth presser set B according to the present embodiment.

Next, the sewing operation of the fabric S by the presser set B of the sewing machine M having the above configuration will be described with reference to FIGS. 6 to 9 based on FIGS. Here, as the fabric S, a highly stretchable fabric formed using yarns including polyester fibers, nylon fibers, and the like was used.
First, the fabric S is inserted between the presser member 4 and the auxiliary presser members 6A and 6B and the upper surface 20A of the throat plate 20 with the sewing needle 28 and the presser foot 1 raised, and the sewing machine M is driven.
As a result, as shown in FIG. 6, the sewing needle 28 and the cloth presser 1 are lowered to approach the upper surface 20 </ b> A of the needle plate 20. Further, the feed member 27 protrudes upward from the feed guide groove 24 and sandwiches the fabric S between the lower surface 4 c of the rear portion of the presser member 4.

  Then, as shown in FIG. 7, the feeding member 27 moves in the direction of arrow W while holding the fabric S and pulls the fabric S. At this time, since the fabric S is lightly pressed against the inner surface of the concave portion 25 by the roll body 13 at the upstream side position of the feeding member 27, tensile resistance is applied, and therefore, the wide arrow V between the roll body 13 and the feeding member 27 is indicated. So as to be stretched. As the presser foot 1 continues to descend, the fabric S is elastically held between the elastically biased auxiliary presser members 6A and 6B and the needle plate 20.

  Further, when the presser foot 1 is lowered, the presser member 4 approaches the upper surface 20A of the needle plate 20, and the step 4b of the presser member 4 and the lower surfaces of the auxiliary presser members 6A and 6B are flush with each other. Press down. In this way, the fabric S is stretched as shown in FIG. 8 and is pressed onto the needle plate 20 by the step 4b around the second needle through holes 10, 10, 10 and is sewn with the lowered sewing needle 28. It is done.

  After the sewing, as shown in FIG. 9, the sewing needle 28 and the presser foot 1 are raised, the sewing needle 28 comes out of the fabric S, and the feed member 27 is separated from the fabric S and enters the feed guide groove 24. As a result, the fabric S that has been pulled until then becomes free and shrinks back toward the roll body 13 (in the direction of the wide arrow Y). At this time, a large amount of sewing thread is drawn out to form a large stitch.

When the elastic fabric S is sewed by the sewing machine M provided with the above-described fabric presser set B, a loop having a large stitch Fa (> conventional stitch F (FIG. 10 (b) )))) Was formed. Therefore, when the position S of the fabric S is held with one hand and the position E is held with the other hand and pulled in the stitch direction, the portion of the position E is a position Ea where the fabric sewn by the conventional sewing machine is extended (FIG. 10 ( It extended to a position Eb farther than b).
As described above, according to the present embodiment, since the stitches Fa having a large loop can be formed, the stretch of the fabric S in the stitch direction regulated by the stretch of the stitches Fa can be increased. It is possible to effectively draw the elongation characteristics of the fabric S. As a result, it was possible to realize beauty without twisting of sewing, shrinkage of the sewing thread, puckering and the like, and good sewing without feeling the resistance of the sewing thread when the cloth S after sewing was stretched.

  Further, since the auxiliary presser members 6A and 6B are elastically biased downward with respect to the presser member 4 by the front end coil springs 32 and 32 and the rear coil springs 34 and 34, the presser condition of the fabric S is soft and beautiful. Sewing is obtained. Further, since the descending presser foot fitting 1 is elastically moved by the auxiliary presser members 6A and 6B, the time for which the fabric S is sandwiched between the needle plate 20 is lengthened, so that a larger loop seam is formed and the fabric S is formed. Will grow even more.

  By the way, the present inventor has filed a patent application (Japanese Patent Application No. 2005-40100) for a presser foot fitting and a presser foot set in which a hanging protrusion is provided on the lower surface of the presser member instead of the roll body of the present invention. Compared with the presser foot metal fitting and presser foot set that have been applied for this patent, the present invention can provide the following further effects due to the presence of the roll body. That is, when the roll body 13 enters the concave portion 25 of the needle plate 20, the fabric S is bent downward with the concave portion 25 to generate sufficient feed resistance, while when the roll body 13 is pulled up from the concave portion 25, Since the roll body 13 rolls on the cloth S to be fed, it can be smoothly performed without hindering the cloth feeding.

  The auxiliary presser members 6A and 6B are attached to both sides of the presser member 4 independently of each other, and coil springs 32 and 32 are interposed between the front end parts 6a and 6a and the front part of the presser member 4, respectively. Therefore, a state as shown in FIG. 11 occurs. That is, even when one of the auxiliary presser members 6A, 6B (in this example, the auxiliary presser member 6B) rides on the thick portion (the already-sewn sewing portion R) of the fabric S, the auxiliary presser member 6B that rides on has the elasticity of the coil spring 32. While moving upward against the force, the auxiliary presser member 6 </ b> A presses a portion of the fabric S. At this time, the roll body 13 and the horizontal axis 12 are inclined. Therefore, even if the cloth presser fitting 1 is a cloth S having portions with different thicknesses, the cloth S can be stably fed by the auxiliary presser members 6A and 6B on both sides, and can be stably fed. It contributes to sewing.

  On the other hand, the fabric S sewn with the three sewing needles 28, 28, 28 at the time of three-needle flat stitching swells between the three straight stitches to form a bulge-like bulge. May be damaged. On the other hand, according to the presser foot fitting 1 of the present embodiment, the step 4b of the presser member 4 is sewn in a state where the fabric S around the second needle through holes 10, 10, 10 is firmly pressed, so As described above, the gap between the seams is flat and remains very flat. This effect is also exhibited in the case of two-needle flat stitching.

The sewing machine to which the present invention is applied is not particularly limited as long as it is a sewing machine having a sewing needle, a presser foot set made of a presser foot fitting and a needle plate, and a feed member. That is, the sewing machine is not limited to the above-described flat stitch sewing machine, and can be applied to various sewing machines such as a lockstitch sewing machine and an overlock sewing machine. The present invention also includes a cloth presser fitting having a presser member in which the “step portion” is omitted and the lower surface is formed flat.
Further, the elastic member used in the present invention is not limited to the above coil spring, and for example, a rubber material or the like may be used. Further, the rear side coil springs 34 and 34 are omitted, and even if only the coil springs 32 and 32 of the front end portion 6a of the auxiliary pressing members 6A and 6B are used, the auxiliary pressing members 6A and 6B are elastically biased downward. It exhibits the action of

It is an external view which shows the cloth clamp of the sewing machine which concerns on one Embodiment of this invention. It is a side view of the said cloth clamp. It is a bottom view of the cloth clamp. It is the components figure which decomposed | disassembled the said cloth presser fitting and was seen from the left side surface. It is a top view of the throat plate which comprises a presser foot set with the said presser foot metal fitting. It is explanatory drawing which shows the sewing operation | movement of the sewing machine equipped with the said work clamp set, and includes the AA arrow cross section of FIG. FIG. 7 is an explanatory view including a partial side cross-section illustrating a sewing operation subsequent to FIG. 6. FIG. 8 is an explanatory view including a partial cross-sectional view illustrating a sewing operation subsequent to FIG. 7. FIG. 9 is an explanatory view including a partial side cross-section illustrating the sewing operation subsequent to FIG. 8. (A) It is a top view which shows the seam sewn by the sewing machine of this embodiment, and (b) the seam sewn by the conventional sewing machine. It is a front view which shows another operation | movement at the time of sewing using the said cloth clamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cloth clamp metal 4 Presser member 4b Step part 4c Lower surface 6A, 6B Auxiliary presser member 6a Front end part 10 Second needle passage hole 11 Storage part 12 Horizontal shaft 13 Roll body 20 Needle plate 20A Upper surface 21 First needle passage hole 25 Recess 28 Sewing needle 31 Mounting hole 32 Coil spring (elastic member)
40 Mounting hole 41 Support hole B Work clamp set M Sewing machine S Cloth W Arrow

Claims (3)

A presser foot fitting that includes a presser member that presses the fabric on the throat plate close to the upper surface of the throat plate having the first pierced hole and has the second pierced hole,
A pair of auxiliary presser members are provided on the left and right sides of the presser member so as to be movable up and down.
A roll body rotatable around a horizontal axis perpendicular to the cloth feeding direction is installed between the pair of auxiliary pressing members at a position upstream of the second needle through-hole of the pressing member in the cloth feeding direction. The roll body is arranged so that the lower end of the circumferential surface is positioned below the lower surface of the pair of auxiliary pressing members,
A sewing machine cloth presser bracket, wherein an elastic member for biasing each auxiliary presser member downward is interposed between at least the front end portion of the pair of auxiliary presser members and the presser member. The sewing machine cloth presser fitting according to claim 1, wherein a lower surface of the presser member around the second needle passage hole is formed as a step portion projecting downward from a lower surface of the second needle passage hole on the downstream side in the cloth feeding direction. The cloth presser fitting according to claim 1 or 2 and the first needle threading hole upstream of the cloth feed direction, and the upper face of the lowered presser fitting facing the roll body are depressed downward. A presser foot set comprising: a needle plate having a concave portion that is formed to accommodate the roll body.

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