JPH1071285A - Puckering reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a fibrous member to be easily withdrawn from a seam even if an article to be sewn is sewn to be stopped at the end. SOLUTION: A plurality of pieces of fibrous members of a number of fibrous members 1 fixed to the outer circumferential edge of an annular band 2 are properly sewn in seam portions according to the seam forming action. As an article 10 to be sewn is carried, the annular band 2 is slid and guided above a holding foot 6 in a separator part 6b, while the article 10 is guided below the holding foot 6. A right side holding part and left side holding part 6c hold down surely the article 10 at both sides of a rising portion of the annular band 2. The fibrous members 1 fixed to the annular band 2 are smoothly withdrawn from the seam portions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing wrinkles generated along a seam of an object to be sewn during a sewing operation.
The present invention relates to a puckering reducing device.

[0002]

2. Description of the Related Art As a prior art for reducing wrinkles (hereinafter referred to as puckering) generated at a seam portion of a thin or soft workpiece with a simple additional device, the same inventor as the present invention has been proposed. Japanese Patent Application Hei 7-19297
There is one. This technology uses a flexible annular band slidably fitted and held on a presser foot, with one end of a number of fibrous members arranged and fixed at the end of the annular band,
This is a puckering reducing device in which the fibrous member is sewn once to the seam at the time of sewing and is automatically removed after the formation of the seam.

[0003] According to this configuration, by using a very slippery material for the flexible annular band and the slide surface (cloth press surface) of the presser foot, the cloth or the like in contact with the presser foot is received. The press resistance of the presser foot can be made very small,
Sewing in which the superimposed cloth or the like shifts with the feeding motion can be reduced. In addition, the buckling of the material to be sewn is suppressed by the drag and elastic repulsion of the fibrous member sewn into the seam of the material to be sewn, and the fibrous member is pulled out after the seam is formed. Since an extra space is formed between the upper thread and the lower thread and the tension of the thread is loosened, it is possible to reduce sewing shrinkage generated in the sewing object. Therefore, puckering can be reduced from both sides of the seam and the seam shrinkage.

[0004]

However, according to the technique disclosed in Japanese Patent Application No. 7-192971, the fibrous member is removed from one side of the presser foot in order to mount the annular band into the concave groove of the presser foot. No cloth presser portion is formed in the portion up to the leaving position. That is, an opening is formed from the position where the presser foot is pulled out to the side. For this reason, at the removal position, the sewing object is pressed by only one side, so that the fibrous member cannot be properly removed from the seam when the annular body rises, and the sewing object together with the annular body cannot be removed. However, there is a problem that the sewing object cannot be continued because the object to be sewn is caught on the presser foot.
This problem is remarkable when the sewing strength of the fibrous member is high or when the strength of the sewn object is low. Specifically, sewing is started from the end or the corner of the sewn object. This is remarkable when the sewing is performed, and particularly when the sewing is performed at the end of the workpiece.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and not only can puckering be reduced, but also sewing can be performed from an end or a corner of a workpiece. It is another object of the present invention to provide a puckering reducing device capable of preventing a sewing object from being caught even when a stop sewing is performed.

[0006]

In order to achieve this object, a puckering reducing device according to the first aspect of the present invention includes a band having a fibrous member projecting in one direction and a sewing material passing through a seam forming point. While holding the material to be sewn to feed the object, the band is guided so that the fibrous member is positioned on the surface of the material to be sewn, and after the seam is formed, the band is moved by the fibrous member to the surface of the material to be sewn. A presser device for guiding the fiber member away from the seam, the fibrous member is sewn to a seam formed on the workpiece, and the fibrous member is removed from the seam after the seam is formed. A packing reduction device, wherein the holding device extends in parallel to a feed direction of the sewn material and presses the sewn material across a position where the band member is removed from a seam of the fibrous member. Side holding portion.

[0007] According to this configuration, since the pair of side pressing portions press the sewing object on both sides of the removal position, the sewing object is prevented from rising together with the band and being caught by the pressing device. Is done.

According to a second aspect of the present invention, there is provided the puckering reducing device according to the first aspect, wherein at least one of the pair of side pressing portions is located downstream of the removal position in the feed direction of the sewing material. A side has a separator part which separates a sewing thing and the above-mentioned belt. Separation is actively performed by the separator.

According to a third aspect of the present invention, there is provided a puckering reducing device according to the second aspect, wherein one of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and It is formed of an elastic material. One of the side holding portions is elastically deformed, and the band is attached to the holding device,
Use after elastic recovery.

According to a fourth aspect of the present invention, in the configuration of the second aspect, one of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and It is rotatably supported so as to form a passage gap for the band with respect to the other side pressing portion. One of the side pressing portions is rotated to form a passage gap, and the side pressing portion is moved back after the band is passed and mounted.

According to a fifth aspect of the present invention, there is provided the puckering reducing device according to the third or fourth aspect, wherein the free end side of the one side holding portion is arranged so that the free end side of the one side holding portion is more advanced than the removal position in the feeding direction of the workpiece. On the downstream side, it faces the other side holding portion with a gap equal to or more than the thickness of the sewing object. Since the gap is formed on the downstream side in the feed direction, even if the sewing object moves above the holding device together with the band, the sewing object can pass through the gap, so that the sewing object is caught by the holding device. There is no.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 are explanatory views of a puckering reducing device according to a first embodiment of the present invention.
1 is a plan view of a main part, FIG. 2 is a cross-sectional view of a main part, FIGS. 3 and 4 are explanatory views showing a presser foot portion, FIG. 3 is a plan view, and FIG. 4 is a side view. First, the puckering reducing device according to the first embodiment will be described with reference to FIGS. 9 to 12. 9 to 12 show the first embodiment to the third embodiment.
It is an explanatory diagram common to the embodiments. 9 is a cross-sectional view of the annular band guide, FIG. 10 is an explanatory view of the relationship between the fibrous member and the seam, FIG. 11 is a perspective view showing a state where the puckering reducing device of the present invention is attached to the sewing machine, and FIG. It is explanatory drawing of the arrangement fixing method of a shape member.

An endless rotating body T as a band according to the first embodiment of the present invention comprises an annular band 2 made of flexible polyethylene or the like. The fibrous member 1 is made of a single fiber made of a synthetic resin such as an acrylic resin or a nylon resin having a diameter smaller than that of the sewing needle 11. Fibrous member 1
Is easily curved when an external force acts on a halfway portion, and returns straight when no external force acts. As shown in FIG.
The fibrous member 1 has a structure in which one end side is woven with fixing fibers 21 made of a material such as nylon resin. Then, the woven portion M of the fibrous member 1 and the fixing fibers 21 is bonded and fixed to the annular band 2. As a result, a large number of the fibrous members 1 are fixed to the end face of the outer peripheral portion of the annular band 2 in a state where they are arranged in parallel at regular intervals. A large number of protrusions 2b having a sectional shape as shown in FIG.
Are provided continuously.

A presser foot 6 made of a plastic material such as PTFE (Teflon) having a good slippery fits and holds the annular band 2 with its projection 2b and the concave groove 5. In addition, a notch surface L is provided so that the lower surface that comes into contact with the workpiece while the annular band 2 is fitted and held is substantially flat. Further, the notch surface L is provided with a concave groove 5 having a cross-sectional shape for holding the annular band 2 slidably while fitting the annular band 2 with the protrusion 2b along the feeding direction of the sewing object. .

As shown in FIGS. 1 and 2, the presser foot 6 has a separator portion 6b downstream of the guide portion 6a having the concave groove 5 in the cloth feeding direction. Although the annular band 2 slides linearly along the notch lower surface of the presser foot 6 in the guide portion 6a, since it originally has an annular shape, it gradually rises upward when released from the restraint by the notch surface. And try to change the moving direction. When the force pulling the annular band 2 downward is strong, the moving direction does not change much upward. However, when reaching the position of the separator portion 6b, the outer peripheral surface of the annular band 2 and the upper surface of the separator portion 6b come into contact with each other, so that the annular band is forcibly moved above the presser foot at least at the position of the separator portion 6b. Can be changed.

Guide 6a of presser foot 6 and separator 6b
Is an opening G that is used when the annular band 2 is fitted into the groove of the guide portion 6a from the side and mounted. After the attachment of the annular band 2, the opening G is covered with a removable thin side cover 15 (see FIGS. 3 and 4). The side cover 15 is made of an elastic and smooth material such as PTFE, and has two cutouts 23 at both ends in the longitudinal direction. Stop pins 17 are driven into and fixed to the side surfaces of the guide portion 6a and the separator portion 6b of the presser foot, respectively. The side cover 15 has the notch 2
3 are respectively fitted to the fixing pins 17 and fixed to the presser foot 6 so as to cover the opening G. Since the side cover 15 is made of a resilient material, the notch 23 may be bent to reduce the distance between the two notches 23 when the notch 23 is to be fitted to the retaining pin 17.

As shown in FIG. 11, the presser foot 6 is screwed and fixed to a presser bar 7, and the presser bar 7 can be moved up and down by a spring (not shown) with respect to the sewing machine head 3 of the lockstitch sewing machine. Will be retained. By the action of this spring, between the lower feed dog 9 as a feed mechanism for the sewing object arranged at the place of the needle plate 8 and the presser foot 6 or the annular band 2 fitted to the presser foot 6, The sewing object 10 is securely held.

The horizontal movement of the square movement of the lower feed dog 9 causes the sewing object 10 to pass through the needle drop point (seam forming point) in the direction of arrow A (the feeding direction of the sewing object).
The annular band 2 is fed while sliding in the direction of arrow A with respect to the presser foot 6. The feed direction of the annular band 2 is
From slightly before b, it changes in the direction of arrow B. As described above, the annular band 2 does not have a fixed center of rotation, and is given a force of substantially rotating motion by the cloth feeding motion of the lower feed dog 9, the path being restricted only near the presser foot 6. become. Further, the fibrous member 1 whose one end is fixed to the outer peripheral surface of the annular band 2 also orbits substantially the same path as the annular band 2. That is, the annular band 2 is gradually guided by the presser foot (corresponding to the presser device of the present invention) 6 from a position away from the sewing object on the upstream side in the feed direction from the stitch forming point, and is sewn on the sewing object. On the downstream side in the feed direction from the eye forming point, the belt gradually separates from the sewing object.
Is rotated in one direction by the square motion of the feed dog. In the present embodiment, the endless annular band 2 is adopted as the band, but may be endless.
In this case, the feeding roller around which the band is wound is rotatably attached to the upstream side in the feed direction of the sewing machine head, and the band fed from there is attached to the presser foot 6, and then passes through the presser foot 6. The wound belt is wound around a winding roller provided on the downstream side in the feed direction of the sewing machine head. The take-up roller can be rotated by a motor in accordance with the sewing speed (the feed speed of the sewing object by the feed dog).

Next, the operation of the first embodiment based on the above configuration will be described. When sewing the sewing object 10 with the upper thread 12 and the lower thread 13, the notch surface L of the presser foot 6 and the sewing object 10
A part of the annular band 2 is sandwiched between the upper band 10a and the upper cloth 10a (FIG. 1).
And FIG. 2), the needle thread 12 and the upper cloth 10a at the needle drop point P.
A plurality of fibrous members 1 are sewn into the seam between (see FIG. 10). Since the annular band 2 originally has a bent shape, the cutout surface of the presser foot 6 is linearly slid while the workpiece 10 is fed in the direction of arrow A by the lower feed dog 9. Although it rotates, it tries to change its moving direction upward after passing through the cutout surface L.

On the other hand, the workpiece 10 is pressed against the needle plate on the downstream side in parallel with the feed direction from both sides of the seam of the side cover 15 and the left pressing portion 6c.
It is about to be fed in the direction of arrow A along the notch surface L or the surface of the needle plate 8. Therefore, the fibrous member 1 in the seam
In this case, the fixed end side of the annular band 2 is pulled upward. When the friction between the fibrous member 1 and the upper thread 12 and the upper cloth 10a is small, the fibrous member 1 starts moving in a direction to get out of the seam by the pulling force.

When the friction is large, for example, when the seam is tightly tightened, the annular band 2 is drawn toward the sewing object 10, but when the annular band 2 comes to a position where it comes into contact with the separator portion 6b. , Forcibly in the direction of arrow B above the separator 6b (see FIG. 2). At this time, the sewn object 10 is held between the side cover 15 and the left holding portion 6.
As a result, the fibrous member 1 starts moving in the direction in which the fibrous member 1 is pulled out of the seam even if there is some friction, and the seam and the fibrous member 1 Unity is in a loose state.

Accordingly, the cloth edge E is separately guided below the separator portion 6b, and is fed in the direction of arrow A along the surface of the needle plate 8. With the separator 6b interposed therebetween, the distance between the annular band 2 and the sewing object 10 gradually increases in the downstream direction of transport of the sewing object, so that the free end of the fibrous member 1 moves from the seam. Is further accelerated, and is completely removed from the seam at a removal point Q further downstream than the removal start point R (see FIGS. 2 and 10).

In the puckering reducing device of the first embodiment, the side covers 15 are formed on both sides of the seam so as to surround the seam between the extraction start point R and the extraction point Q of the fibrous member 1. The left holding part 6c and the rear holding part 6e on the downstream side
Is firmly held down, once the cloth edge E reaches below the separator section 6b and below the rear holding section 6e, the removal of the fibrous member 1 from the seam is extremely difficult. It will be performed continuously and smoothly. A pair of the side cover 15 and the left holding portion 6c extend in parallel with the feed direction of the sewn article of the present invention and press the sewn article across the position where the fibrous member of the band is removed from the seam. This corresponds to the side holding portion.

As described above, when the plurality of fibrous members 1 are sewn to the seam at the time of forming the seam, the material to be sewn 1
The plurality of fibrous members 1 inserted between the upper cloth 10a and the upper thread 12 generate a resistance against buckling and shrinkage. Then, at a position behind the first to third stitches after the formation of the stitches, the rotation trajectory of the outer periphery of the annular band 2 deviates upward from the stitch line (see FIG. 10). The member 1 is automatically extracted, and a gap between the upper thread 12 and the upper surface of the upper cloth 10a at a location where the member 1 is extracted becomes a kind of extra space. A soft seam with reduced buckling and local shrinkage of 10 is formed. Such seams have less puckering.

When the lower feed dog 9 moves squarely to feed the sewing object 10 in a certain direction, the annular band 2 directly holding down the upper cloth 10a is used to cut the notch surface of the presser foot 6 together with the cloth 10a. In this case, the contact resistance between the annular band 2 and the cutout surface of the presser foot 6 can be reduced by using a material with good slip and a small coefficient of friction for both the presser foot 6 and the annular band 2. , Can be kept very small. For this reason, compared with the conventional case where the upper cloth 10a is fed while sliding directly on the entire surface of the presser foot 6, the pressing resistance is reduced, and the lower cloth 10b is fed more than the upper cloth 10a. Thus, a seam having a small number of stitches can be obtained, and puckering caused by the stitch can be reduced.

As described above, the greater the friction between the fibrous member 1 and the upper thread 12 and the upper cloth 10a, such as the tightness of the seam, the more difficult it is for the fibrous member 1 to slip out of the seam. As shown in FIG. 1, the front end E of the
In this case, the fibrous member 1 and the work 10 are already strongly integrated from the front end E by the seam. For this reason, the resistance when the fibrous member 1 comes off from the seam is larger than usual,
The phenomenon that the front end E of the sewing object 10 is guided above the separator portion 6b while the annular band 2 and the seam sewn the sewing object 10 through the fibrous member 1 is integrated. Likely to happen. This phenomenon is more likely to occur as the stiffness of the sewn object 10 is weaker and more flexible, so that the worker holding the sewn object 10 can be sewn with both hands in a direction perpendicular to the feed direction. It is necessary to further sew the workpiece 10 while applying a pulling force to the workpiece 10 while pressing the workpiece 10 in the direction of the needle plate.

However, in the case of the first embodiment, the side cover 15 and the left pressing portion 6c are provided on both side surfaces of the seam.
Are surely pressing the sewn object 10 downward, so that even when the seam is tight and the stiffness of the sewn object 10 is weak, the above-described phenomenon is less likely to occur.

FIGS. 13 and 14 are explanatory views of a phenomenon in which the front end E of the sewing object 10 is guided above the separator 6b. 1 and 2, the annular band 2 and the sewing object 10 are integrated from the front end E via the fibrous member 1 as in the case of FIGS. 1 and 2. However, in this case, since the side cover 15 does not exist, the
Is pressed down on the left holding portion 6c side, but the front end portion E is free in the upward direction in the opening G on the separator portion 6b side. Therefore, when the direction of movement of the annular band 2 in the direction B is changed at or before the position of the separator portion 6b, the sewing object 10 is also easily guided in the same direction as the annular band 2. . That is, the sewn article 10 is
On the other hand, and on the other hand, on the lower surface side of the left holding portion 6c. Therefore, if the feeding is further advanced in this state, the front end portion E is hindered from being fed by the rear pressing portion 6e, so that the sewing cannot be continued soon.

As described above, in the case where the sewing object 10 gets on the upper surface side of the separator portion 6b,
The rear pressing portion 6e in FIGS. 13 and 14 is an obstacle to feeding. However, the sewing object 10 is separated and guided to the lower part of the separator part 6b by providing the side cover 15 as shown in FIGS.
In the case where the sewing object 10 is pressed downward from both sides of the seam at the extraction start point R by both of the steps c, the rear pressing portion 6e causes the fibrous member 1 to slip out of the seam. This has the effect of further ensuring that

A force for pulling up the seam to which the free end side of the fibrous member 1 is sewn to the sewing object 10 in order for the annular band 2 to pull up the fixed end side of the fibrous member 1 upward. However, at this time, it is desirable to press as close as possible to the seam at the extraction start point R and from all sides. By adding the rear pressing part 6e to the separator part 6b and the left pressing part 6c, even in the case of the soft and weak waist material 10, the sewing material 10 can be pressed more reliably. It can promote separation from the seam. This effect is greater than the second and third embodiments described below. Because the first
In the case of the embodiment, the opening G is formed by the side cover 15 at the time of sewing.
In the second and third embodiments, the opening G is slightly behind the extraction start point R, while the periphery of the extraction start point R is almost completely covered. Because it will remain.

Next, a puckering reducing device according to a second embodiment of the present invention will be described. FIG. 5 is a plan view of a main part, and FIG.
FIG. The difference between the configuration of the second embodiment and the configuration of the first embodiment is the presence of the right-hand pressing portion 6f and the position of the opening G. 3 and 4, the side cover 15 detachable from the presser foot 6 is the thin plate-like right side presser portion 6f integrated with the presser foot 6 in FIG. 5 and FIG. The separator portion 6b held by the holding portion 6f is located behind the separator portion 6b. Rear holding part 6
The gap between e and the separator 6b becomes the opening G.
The width of the opening G is smaller than the width of the annular band 2. This is because the entire presser foot 6 is made of an elastic material such as Teflon resin and can be slightly elastically deformed.

When attaching the annular band 2 to the guide portion 6a,
The opening G is allowed to pass while slightly widening the gap. The opening G is not blocked during sewing, but the gap is sufficiently small that the sewing object 10 is rarely pulled upward through this gap. Further, although the right-hand pressing portion 6f is formed integrally with the entire presser foot 6, the right-hand pressing portion 6f may be formed separately and one end thereof may be fixed to the main body of the presser foot 6. The right holding part 6f and the left holding part 6c correspond to a pair of side holding parts of the present invention.

Next, a puckering reducing device according to a third embodiment of the present invention will be described. FIG. 7 is a plan view of a main part, and FIG.
FIG. The difference between the configuration of the third embodiment and the configuration of the first embodiment is the presence of the swing type separator 25 and the position of the opening G. 3 and 4, the side cover 15 that can be removed from the presser foot 6 is shown in FIGS.
Is a part of the swing type separator 25 rotatably held with respect to the presser foot 6. The swing type separator 25 is formed by integrating a thin plate-like right-side pressing portion 25f and a separator portion 25b. A shaft hole 29 is provided at one end of the right-side pressing portion 25f, and a cylindrical fixed shaft 27 is rotatably held about the fixed shaft 29 through the shaft hole 29. The side shape of the swing type separator 25 is as shown in FIG.
A straight portion 25g is provided below the shaft hole 29. On the other hand, a protrusion called a stopper 31 is provided on the side surface of the guide portion 6a, below the press-fit hole of the fixed shaft 27. The swing type separator 25 swings (rotates) in the direction U about the position of the fixed shaft 27 as the center of rotation. This rotation is possible within a range of about 90 degrees. At the time of sewing, the swing type separator 25 is located where the straight portion 25g and the stopper 31 come into contact with each other and stop. Therefore, at the time of sewing, the gap between the separator portion 25b and the rear pressing portion 6e becomes the opening G. The size of the opening G is minimum when the position of the swing type separator 25 is the position at the time of sewing, and is maximum when the position of the swing type separator 25 is at a position rotated by about 90 degrees from the position at the time of sewing. Become. When the size of the opening G is the maximum, a sufficient gap required for mounting the annular band 2 on the guide portion 6a of the presser foot 6 is ensured. In the case where the size of the opening G is minimum, that is, at the time of sewing, the gap is sufficiently small, and the sewing object 10 is rarely pulled upward through the gap.
The swing-type separator 25 and the left-side pressing portion 6c correspond to a pair of side-holding portions of the present invention.

In both the second and third embodiments, the guide portion 6a of the annular band 2 can be mounted in the concave groove 5 without removing the side cover 15 as in the first embodiment. If the fibrous member 1 is severely damaged due to contact with the sewing needle 11 or the like,
Need to be replaced. At this time, there is an advantage that the replacement of the annular band 2 can be performed more easily in the second embodiment and the third embodiment than in the first embodiment.

In both the second embodiment and the third embodiment,
Since the opening G remains behind the extraction start point R, the certainty of pressing the sewing object 10 downward is inferior to that of the first embodiment. However, this may be an advantage in some cases. is there. That is the case where sewing is started after the fastening stitching is performed at the corner of the workpiece 10.

FIG. 15 is an explanatory view of a case where sewing is performed from a corner portion of the sewing object 10 using the puckering reducing device according to the second embodiment. As shown in FIG. 15, when the side end S of the workpiece 10 is located closer to the stitch line than the right-hand pressing portion 6f, the right-hand pressing portion 6f has no effect. Therefore, when the sewing is started after the fastening is performed near the corner front end K of the sewing object, when the corner front end K reaches the position of the separator portion 6b, the fibrous material sewn into the seam is formed. The sewing object 10 integrated with the annular band 2 via the member 1
Is easily led to the upper surface of the separator portion 6b.
At this time, the workpiece 10 is in contact with the upper surface on the side of the separator 6b of the presser foot 6, and is in contact with the lower surface on the side of the left presser 6c. However, even if the front end E reaches the position of the rear pressing portion 6e while the sewing object 10 is in such a positional relationship with respect to the presser foot 6, the gap of the opening G is provided between the separator portion 6b and the rear pressing portion 6e. , The workpiece 10 is merely guided to the lower surface of the rear holding portion 6e (see FIG. 17).

The sewn object 10 is sent downstream of the feed direction (direction A) through the gap of the opening G as it is, but the sewn object 10 is mainly driven by the needle plate 8 due to its own weight and the strength of the waist. Try to be sent along the surface. On the other hand, since the annular band 2 gradually changes its trajectory upward, the fibrous member 1 having one end fixed to the annular band 2 is more than usual, except when the waist of the sewing object 10 is very weak. It will slip out of the seam slightly downstream. Thus, compared to the case of FIG. 16 described below, there is an advantage that the sewing of the corner portion is easily performed normally.

FIG. 16 is an explanatory view of the case where the corners of the sewing object 10 have been led to the upper surface of the separator b in the first embodiment. When the same phenomenon as in FIG. 15 occurs, the forward end E of the sewing object is blocked by the rear pressing portion 6e, so that the feed is delayed,
Soon normal sewing will be impossible.
On the other hand, as shown in FIG. 15, since the interval between the openings G is larger than the thickness of the sewing object and smaller than the width of the annular band 2, the corner K of the sewing object passes through the opening G and the presser foot 6. The sewing can be continued. This is because if the to-be-sewn material and the annular band 2 can be separated from each other by pulling the corner portion having passed the presser foot toward the needle plate side. In this way, even if a corner or the like of the sewn object goes over the separator, the sewing operation can be continued.

The present invention is not limited to the above-described embodiment, but can be variously modified. For example, the separator 6b is commonly used in each embodiment, but is not always necessary. Some sewn articles have weak waist, and are not necessary if the fibrous member 1 can be separated from the stitch even if the stop sewing is performed.

It is not necessary to provide only one of the pair of side pressing portions (the left pressing portion 6c, the right pressing portion 6f, the swing type separator 25, etc.) for the material to be sewn and the annular band. Instead, it is also possible to provide them both.

[0042]

As described above in detail, according to the first aspect, not only a seam with little puckering can be formed, but also a seam from an end or a corner of a work can be formed. Even if the sewing is performed, it is possible to prevent the sewing object from being caught.

According to the second aspect, in addition to the effect of the first aspect, the separation of the sewn material and the band can be reliably performed by the separator, and the sewn material can be reliably prevented from being caught.

According to the third aspect, in addition to the effect of the second aspect, one of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and is formed of an elastic material. Since it is formed, when the band is mounted, it can be used immediately only by elastically deforming one of the side pressing portions and by simply restoring it elastically. That is, there is an advantage that the belt can be attached and detached with one touch, and the usability is good.

According to the fourth aspect, in addition to the effect of the second aspect, one of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and the other side pressing portion is provided. Since it is rotatably supported so as to form a passage gap for the band with respect to the holding portion, one side holding portion is turned to form a passage gap for the band and pass through the band. After the mounting, the side pressing portion can be moved back. Therefore, not only can the band be easily mounted, but also the rigidity of the side holding portion can be increased, and the product life can be extended.

According to the fifth aspect, in addition to the effect of the third or fourth aspect, the free end side of one of the side pressing portions is located on the downstream side in the feed direction of the sewing object from the removal position. It is opposed to the side holding portion with a gap equal to or more than the thickness of the workpiece. Since the gap is formed on the downstream side in the feed direction, even if the sewing object moves above the holding device together with the band, the sewing object can pass through the gap.
Sewing can be continued without the sewing object getting caught on the presser device.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a puckering reducing device according to a first embodiment.

FIG. 2 is a cross-sectional view taken along line DD of FIG.

FIG. 3 is a plan view of a presser foot portion of the first embodiment.

FIG. 4 is a side view of a presser foot portion of the first embodiment.

FIG. 5 is a plan view of a presser foot portion according to the second embodiment.

FIG. 6 is a side view of a presser foot portion according to the second embodiment.

FIG. 7 is a plan view of a presser foot portion according to a third embodiment.

FIG. 8 is a side view of a presser foot portion according to the third embodiment.

FIG. 9 is a cross-sectional view showing a state of an annular band slidably fitted and held on the presser foot.

FIG. 10 is an explanatory diagram of a process in which the fibrous member is sewn into a seam and further removed.

FIG. 11 is a perspective view showing an example of mounting the puckering reducing device of the first, second, and third embodiments on a sewing machine head.

FIG. 12 is an explanatory diagram of a method of fixing and arranging fibrous members.

FIG. 13 is a plan view illustrating end sewing by a conventional puckering prevention device.

FIG. 14 is a sectional view taken along line CC in FIG.

FIG. 15 is an explanatory diagram of corner sewn by the puckering reduction device of the second embodiment.

FIG. 16 is an explanatory diagram of corner sewn by the puckering reduction device of the third embodiment.

FIG. 17 is a diagram showing a case where the corner of the sewing object comes out above the presser foot in FIG. 15, and is an explanatory diagram showing only a main part of the presser foot as viewed from the left in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fibrous member 2 annular band 5 concave groove 6 presser foot 6a guide 6b separator 6c left presser 6e rear presser 6f right presser 9 lower feed dog 10 sewing object 15 side cover 25 swing type separator 25f right Holder 25b Separator G Opening

Claims (5)

[Claims] 1. A band having a fibrous member protruding in one direction, holding a sewing object for feeding the sewing object through a stitch forming point, and covering the band with a fibrous member. A holding device for guiding the belt to be located on the surface of the sewing product, and guiding the band after the formation of the stitch so that the fibrous member is separated from the surface of the sewing target; and forming the fibrous member on the sewing target. A puckering reducing device configured to sew the stitch to be formed and to remove the fibrous member from the stitch after the formation of the stitch, wherein the pressing device is parallel to a feed direction of the workpiece. And a pair of side holding portions for holding the material to be sewn with a position where the fibrous member of the band is removed from the seam. 2. A method according to claim 1, wherein at least one of the pair of side holding portions has a separator portion for separating the sewn material and the band at a downstream side in the sewn material feed direction from the removal position. The puckering reducing device according to claim 1, wherein 3. The device according to claim 2, wherein one of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and is formed of an elastic material. Puckering reduction device. 4. One of the pair of side pressing portions is supported in a cantilever manner with respect to the other side pressing portion, and forms a passage gap of the band body with respect to the other side pressing portion. The puckering reducing device according to claim 2, wherein the puckering reducing device is rotatably supported. 5. The free end side of said one side holding portion is at least as thick as the thickness of the material to be sewn with respect to said other side holding portion on the downstream side in the feed direction of the material to be sewn from the removal position. 4. The device according to claim 3, wherein the members face each other with a gap.
Or the puckering reducing device according to 4.