JP2003144781A - Cloth end curl correcting device, and sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent occurrence of sewing defectives due to sewing an outer curl part at a cloth end in a simple constitution, and stably conduct hemming with good quality without requiring skill. SOLUTION: The outer curl part C generated in a folded end edge E of a cloth W is guided by a front guide plate 54, an upper guide plate 55, and a lower guide plate 52, it is fed to an introducing groove 6a to reduce width toward the rear side, and it is fed to be held in a raised attitude by means of a holding groove 6b of thin width continuously provided on the back side of the introducing groove 6a. It is elongated by a cloth end guide 53 protruded on the back side of the holding groove 6b to be fed to a needle location position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material end curl for correcting the outer curl generated at the material end which is folded and sewn on the back side of the material at the front side of the needle drop position when the hem is sewn. The present invention relates to a straightening device and a sewing machine including the same.

[0002]

2. Description of the Related Art As shown in FIG. 5 (a), the bottom hem sewing performed as a hem processing of a T-shirt or the like is performed by folding an end edge E of a cloth W over a predetermined width on the back side, Is a sewing process in which the vicinity of is sewn from the front side of the cloth W. Conventionally, such a hem pulling stitch is generally performed by using a flat stitch sewing machine or a double chain stitch sewing machine, folding back the edge of the fabric manually by the sewing manufacturer, and keeping the folded state to the needle drop position. It is done by sending in. In Figure 5,
A seam A is formed by double chain stitch.

However, in the hem pulling sewing by the manual work as described above, it is necessary to adjust the folding back width before the needle drop position and maintain the folding back width to feed it to the needle drop position. There is a problem that a sewing manufacturer requires a high degree of skill in order to stably realize high-quality sewing.

Under these circumstances, conventionally, a guide means for guiding the folded back edge E of the cloth W, and a knife which appears before and after the needle drop position to cut the folded back edge E of the cloth W into a predetermined width. Various sewing machines including auxiliary means for assisting the adjustment of the folding width have been proposed.

[0005]

However, even if the bottom sewing is performed using the sewing machine provided with the above-mentioned auxiliary means, for example, the cloth W to be sewn has a curl like a knit cloth. In the case of easy-to-use fabric, the folded edges of the fabric W fed to the needle drop position are curled to the front side or the back side, respectively, and the curled portion is sewn in a state of being folded back to the outside or inside of the edge E. There was a risk that

FIG. 5B shows a state where the curl portion is sewn. The sewn portion of the curl portion occurs when a part of the edge E is folded back, and in particular, when the curl portion is an outer curl curled on the front side of the cloth W, the edge E as shown in the drawing. There is a problem that a defective sewing portion B folded back to the outside is generated and the quality of the obtained sewn product is greatly impaired.

In order to prevent the outer curl portion from being sewn as described above, it is necessary to manually adjust the folding width and to perform the manual operation by the operator.
This is done by stretching and correcting the outer curl portion in front of the needle drop position, and there is a problem that this correction requires a great deal of labor, and in particular, the fabric W is highly stretchable such as a knit fabric. In the case of a cloth, there is a problem that a high degree of skill is required to correct the curl without causing these expansion and contraction.

Japanese Unexamined Patent Publication (Kokai) No. 6-254273 discloses an apparatus for correcting the outer curl generated at the edge folded back on the back side of the cloth in the hem sewing.
This device has a blowout port for blowing air along the back surface of the cloth on the front side of the needle drop position, and the outer curl portion generated at the end edge is extended by the flow of the air and sent to the needle drop position. It is what

However, in this structure, it is difficult to set the air outlet immediately before the needle drop position, and the outer curl portion extended by the air blow is restored before reaching the needle drop position. Good sewing may not be performed. In addition, there is a problem that the entire configuration including an air source for supplying air to the air outlet becomes complicated, and it is difficult to employ it in a small-sized sewing factory that does not have the air source.

The present invention has been made in view of the above circumstances, and it is possible to reliably correct the outer curl portion of the fabric end that is folded back and sewn on the back side of the fabric at the position immediately before the needle drop position. A material edge curl straightening device capable of effectively preventing the occurrence of sewing failure due to the sewing of the outer curl portion with a simple configuration and stably performing high-quality hem pulling sewing without skill, and this. It aims at providing the sewing machine provided with.

[0011]

A fabric edge curl straightening device according to a first aspect of the present invention is provided on a sewing machine for performing bottom sewing, and is generated at a folded edge of a fabric fed to a needle drop position of the sewing machine. In the material curl straightening device that corrects the outer curl portion that is in front of the needle drop position,
A guide plate that holds the folded-back portion of the cloth and folds it over the back side of the cloth when the cloth is fed to the needle drop position, and a curl receiving member that is connected to the rear side of the guide plate and that receives the outer curl portion. A portion and a curl receiving portion projecting from the rear side toward the needle drop position, abutting on the outer curl portion sent out from the curl receiving portion, so that the outer curl portion follows the back surface of the cloth, It is characterized in that it is provided with a cloth material end guide which is raised along with the feeding to the needle drop position.

According to the present invention, the outer curl portion formed on the edge folded back on the back surface of the cloth is received by the curl receiving portion by the action of the guide plate, and the curl receiving portion adjusts it to a predetermined posture and sends it out. Then, it is raised by the action of the material end guide provided on the rear side of the curl receiving portion, and is fed to the needle drop position along the back surface of the material.

Further, in the dough edge curl straightening device according to the second aspect of the present invention, the curl receiving portion in the first aspect of the invention has an introduction groove which is continuous with the front opening and has a width reduced rearward, and a rear side of the introduction groove. And a holding groove that is continuously provided on the side so that the width can be adjusted and that holds the outer curl portion in a standing posture.

In the present invention, the curl receiving portion is constituted by the introduction groove whose width is reduced toward the rear side, and the holding groove continuously provided on the rear side of the introduction groove, and the outer curl portion is provided in the introduction groove. The sheet is surely received and is introduced into the holding groove while correcting the posture due to the reduction of the width, and is fed while being kept in the standing posture by the action of the holding groove, and is reliably delivered to the rear material end guide.

Further, in the material edge curl straightening device according to the third aspect of the present invention, the material edge guide in the first or second aspect of the invention is attached such that the protrusion length of the curl receiving portion to the rear side can be increased or decreased. It is characterized in that it is composed of the wire.

In the present invention, the material end guide is made of a wire material such as a piano wire having a small diameter but high rigidity, and it is possible to project to the vicinity of the needle drop position, and the outer curl portion is provided on the back surface of the material. Send it to the needle drop position in a straightened state.

Further, the sewing machine according to the present invention is a sewing machine provided with a material end curl straightening device at a position before the needle drop position for correcting an outer curl portion generated at a folded edge of a material fed to the needle drop position. The dough edge curl straightening device holds the folded-back portion of the dough, and a guide plate that is folded back on the back side of the dough with feeding to the needle drop position, and is provided continuously to the back side of the guide plate, A curl receiving portion that receives the outer curl portion, and a curl receiving portion that projects from the rear side of the curl receiving portion toward the needle drop position and abuts the outer curl portion that is sent out from the curl receiving portion. It is characterized in that it is provided with a cloth end guide which is raised along with the feeding to the needle drop position so as to follow the back surface of the cloth.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is an external perspective view of a sewing machine including a material edge curl straightening device according to the present invention.

The sewing machine shown in the drawing has a sewing machine arm 11 whose base end is supported by legs 10 standing on the bed body 1.
Further, the flat stitch sewing machine is provided with a cylindrical bed 12 having a small diameter, which is provided on one side of the bed body 1 so as to project below the sewing machine arm 11.

A needle bar 20 and a presser bar 30 are suspended from the tip of the sewing machine arm 11, and a plurality of needles (2, 3 in the figure) are provided at the lower end of the needle bar 20. Also presser bar 30
A presser foot 3 is attached to the lower end of each. On the upper surface of the tubular bed 12, a needle plate 4 (see FIG. 2) is installed below the needles 2, 2 ... and the presser foot 3, and inside the tubular bed 12 below the needle plate 4. Is equipped with a looper and a feed dog (not shown).

The needles 2, 2 ... Are moved up and down together with the needle bar by a predetermined stroke including the up and down movement of the needle plate 4 by transmission from an upper shaft (not shown) installed inside the sewing machine arm 11. Yes. Further, the presser foot 3 is lowered onto the needle plate 4 by a predetermined operation, and the cloth W (see FIG. 2) fed into the cylindrical bed 12 as will be described later is attached to the needle plate 4.
It is designed to be held between and.

The flat stitch sewing machine constructed as described above is
As shown in FIG. 1, the curl straightening device 5 according to the present invention is provided on the front side of the needle plate 4 on the tubular bed 12. Figure 2
FIG. 3 is a perspective view showing the configuration of the curl straightening device 5 together with the needle plate 4.

As shown in the figure, a plurality of needles (2) for inserting the needles 2, 2 ... In the drawing, three needle drop holes 40, 40 ... Are formed side by side in the width direction to set the needle drop position, and the feed dogs should be projected on the front, rear, left and right sides of this needle drop position. Feed dog holes 41, 41 ... Opening in a rectangular shape are formed. 2, illustration of the needles 2, 2 ... and the presser foot 3 and illustration of the distal end portion of the tubular bed 12 extending to the left side of the needle plate 4 are omitted in order to prevent the drawing from being complicated.

The curl straightening device 5 includes a ruler plate 51 mounted on a ruler stand 50 fixed on the cylindrical bed 12 so as to traverse the front part of the needle plate 4 as described above, and the ruler plate 51. Lower guide plate 52 mounted so that the position can be adjusted in the left-right direction
And a material end guide 53 attached to the upper surface of the lower guide plate 52 as described later, and further, a front guide plate 54 attached to the front position of the lower guide plate 52, and a left and right direction on top of these. And an upper guide plate 55 that is positionally adjustable.

As shown in the figure, the ruler plate 51 is provided with a ruler edge 51a which vertically stands up the left end portion thereof and extends in the front-rear direction. On the upper part of the ruler edge 51a, a seat plate 51b extending substantially horizontally to the left so as to serve as a mounting seat for the upper guide plate 55.
Are lined up.

FIG. 2 shows a state in which the upper ruler plate 55 is removed. The upper ruler plate 55 is a thin flat plate that includes a base portion 55a having a long hole for fixing formed along one edge, and a bent piece 55b that projects obliquely outward at the other edge of the base portion 55a. The base 55a is superposed on the upper surface of the seat plate 51b, and the pair of setscrews 56, 56 inserted into the elongated holes are screwed into the separate screw holes formed on the seat plate 51b so as to be laterally separated from each other. Thus, the folded piece 55b is fixed so as to face diagonally forward to the right. The upper ruler plate 55 fixed in this way is
By loosening 6,56, using the long hole as a guide,
The position can be adjusted left and right within a predetermined length range.

FIG. 3 is a perspective view showing how the lower guide plate 52 and the front guide plate 54 are attached. In this figure, a part of the lower guide plate 52 is cut away and the front guide plate 54 is removed for the sake of clarifying the respective mounting states.

The lower guide plate 52 is a plate material having a thickness such that when it is placed on the upper surface of the ruler plate 51 on the ruler stand 50, the lower guide plate 52 is located slightly above the upper surface of the rear needle plate 4. It is provided with a mounting flange 52a in which one edge is bent at a right angle over an appropriate width and a fixing long hole extending along the one edge is formed. Such a lower guide plate 52 is placed on the upper surface of the ruler plate 51 as shown in the figure, and a pair of setscrews 57, 57 inserted through the long holes of the mounting flange 52a are attached to the front surface of the ruler stand 50. Separate screw holes (not shown) formed left and right
Like the upper ruler plate 55, it is mounted so as to be adjustable in position in the left-right direction within the length range of the elongated hole by being screwed in.

With the above attachment, the ruler edge of the ruler plate 51
On the left side edge of the lower guide plate 52 facing the 51a, a taper edge 52c which is inclined in a taper shape toward the front right direction is formed in the front half portion thereof.
Is provided. To attach the lower guide plate 52, secure a gap of an appropriate width between the portion continuous to the rear side of the tapered edge 52c and the ruler edge 51a, and between the lower guide plate 52 and the ruler plate 51, An introduction groove 6a having a wide opening in the front portion, the width of which is reduced toward the rear, and a holding groove 6b of a constant width, which is continuously provided on the rear side of the introduction groove 6a, are formed. The width of the holding groove 6b can be increased or decreased by adjusting the position of the lower guide plate 52 in the left-right direction.

The front guide plate 54 is a thin plate material formed as shown in the figure. One side of the front guide plate 54 is fixed to the front surface of the mounting flange 52a of the lower guide plate 52 by a set screw 58, and the other side of the ruler plate 51 is fixed. It is attached so that it is substantially flush with the upper surface and extends to the left. By this attachment, a guide piece 54a that is bent and formed obliquely downward is provided at the left end portion of the front guide plate 54 located near the front opening of the introduction groove 6a.

On the other hand, the material end guide 53 is, as shown in the drawing,
It is a thin wire that is cut to an appropriate length, and the lower guide plate 52
It is embedded in a groove formed on the upper surface of the holding groove 6b, and the middle portion thereof is pressed by a set screw 59 so that the tip is projected obliquely rearward of the rear opening of the holding groove 6b. The protruding length of the material end guide 53 as described above is the set screw 59
By loosening and moving it along the groove, it is possible to change it appropriately within a range where it does not interfere with the presser foot 3.

In the sewing machine having the curl straightening device 5 configured as described above, the folded piece 55b of the upper guide plate 55 is formed.
The cloth W folded back to the back side over a predetermined width in the vicinity of the edge E by using is set in a state of being sandwiched between the cloth and the lower guide plate 52, as indicated by a two-dot chain line in FIG. When the sewing machine is driven in this state, the material W is fed by the action of the feed dogs protruding above the needle plate 4, and the needles 2, 2 ... Which descend into the needle drop holes 40, 40 ... On the needle plate 4. By the operation of the looper (not shown) under the needle plate 4, the bottom hem is sewn as shown in FIG.

During this period, the edge E of the cloth W is guided onto the ruler plate 51 by the action of the guide piece 54a of the front guide plate 54,
The folding length is regulated by the ruler edge 51a, and it is fed onto the needle plate 4 with a substantially constant folding width. The upper guide plate 55 may be configured to be retracted leftward together with the ruler plate 51 by the operation of an appropriate driving means such as an air cylinder. It can be set easily.

As shown in FIG. 2, the curl straightening device 5 causes the outer curl portion C formed at the folded edge E of the cloth W to be fed with the cloth W as shown in FIG. The material is corrected in stages and is fed to the needle drop position while being properly aligned with the back surface of the cloth W.

FIG. 4 is a diagram for explaining the operation of the curl straightening device 5, and FIGS. 4 (a), 4 (b) and 4 (c) are each a line A- in FIG.
The state of the cloth W in each cross section of A, BB, and CC is shown.

The edge E of the cloth W is guided to the upper surface of the ruler plate 51 by the action of the front guide plate 54 as described above. Ruler plate 51
On the upper surface of the lower guide plate 52, there is formed an introduction groove 6a which is opened wide by the taper edge 52c of the lower guide plate 52, and the outer curl portion C generated at the end edge E is securely received in the introduction groove 6a. To be done.

The introduction groove 6a is formed so as to reduce its width toward the rear side, and the outer curl portion C is pushed toward the ruler edge 51a of the ruler plate 51 as the material W is fed. 4 and is gradually extended from the side away from the edge E and guided into the holding groove 6b continuous to the rear side of the introduction groove 6a.
As shown in (b), the holding groove 6b is held in a standing posture.

The width of the holding groove 6b can be increased / decreased by adjusting the left / right position of the lower guide plate 52, and this increase / decrease adjustment can be made according to, for example, the thickness of the cloth W and the generation state of the outer curl portion C. By doing so, it is possible to surely realize the holding posture as shown in FIG.

The outer curl portion C in the holding groove 6b as described above is
By further feeding the material W, the material W escapes to the rear side of the holding groove 6b, and on the rear side, the material end guide 53 made of a wire material is provided.
Is projected to the left diagonally rearward, and the outer curl portion C
As shown in FIG. 4 (c), it rides on the cloth end guide 53 and is extended along the back surface of the cloth W as the cloth W advances.

As described above, the protruding length of the material end guide 53 is
It is possible to bring the needle fall position on the needle plate 4 as close as possible to the range where it does not interfere with the presser foot 3, and the outer curl portion C extended by the material end guide 53 keeps this extended state and presses it. It is passed between the gold 3 and the needle plate 4. As a result, at the needle drop position, there is almost no risk of a sewing failure portion B as shown in FIG. 5B, and good hem pull-down sewing can be performed stably.

The material end guide 53 is not limited to the above-mentioned wire rod, and can be made of an appropriate material such as a rod material or a plate material. However, by using a wire rod having a small diameter, the protrusion length can be adjusted. The structure of fixing the lower guide plate 52 to the upper surface can be simply realized, and the needle drop position can be arranged as close as possible while avoiding interference with peripheral members such as the presser foot 3. The extension operation of the outer curl portion C described above can be reliably performed. As the wire rod used as the material end guide 53, it is desirable to use a wire rod having a small diameter but high rigidity, such as a piano wire.

The edge E folded back on the back side of the cloth W
In a sewing machine with a knife that is provided with a knife for trimming to a predetermined width in front of the needle drop position, the material end guide 53 can be reasonably arranged immediately before the knife, and increase / decrease adjustment of the protruding length is substantially unnecessary. . Therefore, the material end guide 53 can be a plate material, and can be configured to be fixedly supported on the upper surface of the lower guide plate 52, and further, the left edge portion of the lower guide plate 52 that forms the introduction groove 6a and the holding groove 6b. It is also possible to integrally configure the material end guide 53 at the rear end.

[0043]

As described above in detail, in the fabric edge curl straightening device according to the first aspect of the present invention, the outer curl portion formed on the edge folded back on the back surface of the fabric is the guide plate and the curl receiving portion. Also, since it is straightened by the mechanical action of the material edge guide and is fed to the needle drop position along the back surface of the material, it is possible to effectively prevent the occurrence of sewing defects due to the sewing of the outer curl portion, although it has a simple structure. Therefore, it is possible to stably perform high-quality hem pull-out sewing without requiring skill.

Further, in the fabric edge curl straightening device according to the second aspect of the present invention, the curl receiving portion is provided with an introduction groove for reducing the width toward the rear side, and a holding groove continuously provided on the rear side of the introduction groove. The outer curl portion can be reliably received in the introduction groove, and the outer curl portion that is gradually corrected by the reduction of the width of the introduction groove can be kept in the standing posture by the action of the holding groove. It can be sent out, and the final curl correction by the material edge guide can be surely performed.

In the material edge curl straightening device according to the third aspect of the present invention, since the material edge guide is composed of the wire rod attached so that the protrusion length of the curl receiving portion to the rear side can be increased or decreased, It is possible to place it closer to the position immediately before the needle drop position, it is possible to satisfactorily correct the outer curl portion, and it is possible to more reliably prevent the occurrence of sewing defects due to the sewing of the outer curl portion. .

Further, in the sewing machine according to the present invention, due to the mechanical action of the guide plate before the needle drop position, the curl receiving portion, and the material end guide, the outer edges of the folded back edge of the material fed to the needle drop position are generated. Since the curl is straightened along the back of the fabric, it is possible to suppress the occurrence of sewing defects due to the sewing of the outer curl and to perform high-quality hem pull-out sewing stably without requiring skill. And so on,
The present invention has excellent effects.

[Brief description of drawings]

FIG. 1 is an external perspective view of a sewing machine including a material edge curl straightening device according to the present invention.

FIG. 2 is a perspective view showing a configuration of a curl straightening device together with a needle plate.

FIG. 3 is a perspective view showing a mounted state of a lower guide plate and a front guide plate.

FIG. 4 is an operation explanatory diagram of the curl straightening device.

FIG. 5 is an explanatory view of a sewing failure in the bottom hem sewing.

[Explanation of symbols]

2 needles 3 presser foot 4 needle plate 5 curl straightening device 6a Introduction groove 6b retaining groove 51 Ruler plate 52 Lower guide plate 53 Material edge guide 54 Front guide plate 55 Upper guide plate C outer curl W fabric

Continued front page    (72) Inventor Yoshiyuki Tanaka             2-10-3 Hotaruikeminami-cho, Toyonaka-shi, Osaka Prefecture             Matomishin Manufacturing Co., Ltd. Toyonaka factory (72) Inventor Takayuki Hayashida             2-10-3 Hotaruikeminami-cho, Toyonaka-shi, Osaka Prefecture             Matomishin Manufacturing Co., Ltd. Toyonaka factory F term (reference) 3B150 AA12 BA03 BA11 CB06 CE07                       CE23 EC02 EC03 EC04 EC10                       ED01 ED09 HA01

Claims (4)

[Claims] 1. A fabric edge curl straightening device for straightening an outer curl portion generated at a folded edge of a fabric fed to a needle drop position of a sewing machine for hem pulling sewing at a position before the needle drop position. A guide plate that holds the folded-back portion of the cloth and folds it over the back side of the cloth when it is fed to the needle drop position, and a curl receiving member that is connected to the rear side of the guide plate and that receives the outer curl portion. Part and a rear side of the curl receiving part projecting toward the needle drop position, abutting on an outer curl part sent out from the curl receiving part, so that the outer curl part is along the back surface of the cloth, A material edge curl straightening device, comprising: a material edge guide that is raised when the material is fed to the needle drop position. 2. The curl receiving portion is connected to an introduction groove that is continuous with a front opening and has a width that decreases rearward, and a rear side of the introduction groove, the width of which is adjustable so as to be adjustable. The material edge curl straightening device according to claim 1, further comprising a holding groove that holds the posture. 3. The material edge curl according to claim 1 or 2, wherein the material edge guide is constituted by a wire rod attached so as to be able to increase or decrease the protrusion length of the curl receiving portion to the rear side. Straightening device. 4. A sewing machine comprising a material edge curl correction device for correcting an outer curl portion generated at a folded edge of a material fed to the needle drop position at a position before the needle drop position. The device holds a folded-back portion of the cloth, and a guide plate that folds and overlaps on the back side of the cloth when it is fed to the needle drop position, and is connected to the rear side of the guide plate to receive the outer curl portion. And a curl receiving portion that protrudes from the rear side of the curl receiving portion toward the needle drop position, abuts on the outer curl portion sent from the curl receiving portion, and the outer curl portion extends along the back surface of the cloth. In order to make it possible, the sewing machine is provided with a cloth material end guide which is raised when the material is fed to the needle drop position.