JP2009000170A - Apparatus and method for sewing fabric end - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically perform hem-sewing of an end of the fabric of a narrow cylindrical part such as the hem of briefs by folding the fabric end and to achieve secure and beautiful finish. <P>SOLUTION: The sewing apparatus includes a fabric guide 5 for retaining the fabric W fed to a needle position S of a sewing machine 2; fabric feeding means 9 for feeding the fabric W to the needle position S; air blowing means 6 for blowing air to the fabric W in the direction orthogonally crossing the direction of feeding the fabric as seen from the top; in/out adjusting means 8 capable of applying drive to the fabric W to be hauled in the direction opposite from the direction of blowing air; and a fabric end detection part 7 for detecting the state of the fabric end matching a prescribed position of the fabric guide 5 in the inward/outward direction relative to the needle position S. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fabric edge sewing apparatus and a fabric edge sewing method.

Various devices have been proposed to fold the fabric end of the fabric formed into a cylindrical shape into a predetermined width and sew it in a border shape along the cylindrical shape, but most of the conventional devices of this type are For example, hemline stitching (for example, see Patent Document 1) for shirts and other upper articles, and top-sewing (or rubber placement) for underwear such as briefs (for example, see Patent Document 2). . Since the upper part of the upper part and the lower part (waist part) of the lower part are parts worn around the waist from the abdomen, their cylinder diameters are sufficiently large.
The upper fabric is knitted into a cylindrical shape by a circular knitting machine, etc., so there is usually no stitched part (seam) that intersects the fabric edge in the circumferential direction of the hem. Since the dough for sewing has a plurality of dough parts stitched together to form a drawing portion in a cylindrical shape, it is common that two or more stitched portions intersecting the fabric end in the circumferential direction are formed.

It should be noted that in the device for carrying out top pull sewing on the underwear (the above-mentioned patent document 2), the inner guide plate is operated to be pushed into the U-shaped curved portion toward the U-shaped curved outer guide plate. Thus, the fabric is mechanically and forcibly sandwiched between the inner and outer guide plates, and as a result, the fabric end of the fabric is bent in a U-shape.
By the way, an opening for passing the left and right feet (hereinafter referred to as “hem opening”) is formed in the bottom of the lower article such as a brief. It can be said that it is a small-diameter cylindrical part. Conventionally, no device has been proposed for automatically folding the edge of the fabric around such a small-diameter cylindrical portion around the entire circumference and automatically sewing it into an edge shape.

Conventionally, in such a small-diameter cylindrical portion, the end of the fabric is folded all around and sewn in an edged shape, once sewing is started from a predetermined stitching portion and reaches the next stitching portion, It was necessary to stop the sewing machine, reset the fabric with respect to the sewing machine, and then sew up to the next sewing position. Naturally, such labor has to be repeated as many times as the number of stitched portions.
JP-A-5-76677 Japanese Utility Model Publication No. 5-70476

As described above, there has not yet been proposed a device for automatically folding a fabric end of a small-diameter cylindrical portion around the entire circumference and automatically sewing it into an edge shape. The reason is as follows.
That is, since the cylindrical diameter of the cylindrical portion is small (peripheral length is short), the cloth cannot be stretched around the needle position of the sewing machine. As a result, with respect to the direction in which the fabric is fed to the needle position of the sewing machine (circumferential direction of the cylindrical portion), the fabric has a steep angle between the location just before folding the fabric end and the location just after folding the fabric end. A crease will occur. And this tension will cause strong tension.

Since the cloth for the underwear such as the brief is formed by sewing a plurality of cloth parts as described above, two or more stitched portions intersecting the cloth edge in the circumferential direction are formed also in the small-diameter cylindrical portion. Yes. Since such a stitched portion has a crack, it is clear that if the crease portion as described above is derived from the stitched portion, the tension generated in the stitched portion is further increased in intensity. .
As a result, in the first place, it is very difficult to fold back at the end of the fabric having a small-diameter cylindrical portion, and more and more difficult to fold at the crossing position with the stitched portion in the end of the fabric.

  In addition, the small-diameter cylindrical portion formed in the lower article such as a brief has a unique shape in which the fabric end is inclined and curved with respect to the cylindrical axis, and in addition, the stitched portion is the boundary. There is a circumstance that the fabric texture is different on both sides. Therefore, even if it can be folded back, it is difficult to stabilize the folding width and the sewing line, it is difficult to rotate the entire lower article around the cylinder axis during sewing, and twisting is likely to occur after sewing. In addition, automatic sewing has been extremely difficult due to various problems such as the fact that the sewing start and the sewing end are difficult to coincide with each other around the cylinder.

On the other hand, from the viewpoint of the machine, there is a space around the sewing machine to install a mechanism for folding the fabric, a fabric feed mechanism, a mechanism for pressing the fabric and handling the fabric, and a mechanism for adjusting the fabric in and out of the sewing machine. What I couldn't do was a big bottleneck.
Needless to say, in order to manually fold the small-diameter cylindrical portion formed in the underwear and sew it into an edged shape, it is necessary to repeat the setting of the fabric many times during sewing. As a result, there was a limit to improving work efficiency (production efficiency).

In addition, a high level of skill is required to reliably and quickly process the process of re-setting the fabric, and defective products (such as deviations in the sewing position and meandering) may occur depending on the level of skill and work variations. There was also.
The present invention has been made in view of the above circumstances, and even if it is a small-diameter cylindrical portion or the like (such as a hem opening for passing a foot in a brief) formed as a lower article, the fabric It is an object of the present invention to provide a fabric edge sewing apparatus and a fabric edge sewing method that can automatically perform an operation of folding an edge and sewing it into a border shape and obtaining a reliable and beautiful finish.

In order to achieve the above object, the present invention has taken the following measures.
That is, the cloth edge sewing apparatus according to the present invention includes a sewing machine, a cloth guide, a cloth feeding means, an air blowing means, an entrance / exit adjusting means, and a cloth edge detecting section.
The cloth guide is configured to hold the cloth in a flat state toward the needle position of the sewing machine.
The fabric feeding means feeds the fabric held in a flat state by the fabric guide to the needle position.

The air blowing means extends the fabric end of the fabric in the direction of entering and exiting the needle position by blowing air to the fabric held in a flat state by the fabric guide in a plane orthogonal to the fabric feeding direction. It is. Here, the “entrance / exit direction with respect to the needle position” refers to the direction of entering / exiting, and is not limited to any one of entering / exiting.
The entry / exit adjusting means is capable of giving a hand-feeding drive to the cloth in a direction opposite to the direction in which the edge of the cloth is extended by the air blowing means.

The “hand-feeding drive” by the in / out adjusting means refers to a drive that is generated in a direction opposite to the movement force when a movement force is generated in the cloth as the cloth edge is extended. It is assumed that the movement direction by “movement force generated in the fabric” and “hand-drawing driving” is determined based on the position where the entry / exit adjustment means is provided.
The cloth edge detecting unit detects a state in which the cloth edge matches a predetermined position of the cloth guide in the direction of entering and exiting the needle position.
With such a configuration, the cloth is pushed out in one direction using the air blowing pressure by the air blowing means, and the necessary amount of the cloth is drawn (pulled back) by the mechanical driving force by the entrance / exit adjusting means. By this method, the fabric can be aligned, so that the fabric edge of the fabric can be accurately and quickly matched to a predetermined position based on the needle position or the like.

In addition, when the fabric is pulled back too much by hand-feeding driving by the entry / exit adjustment means, for example, the entry / exit adjustment means may be driven in reverse to push out the fabric.
In this case, since the mechanism is simple and can be made compact, even if it is difficult to secure a sufficient space around the sewing machine, the machine can be installed without any problem. Therefore, the following configuration can be added.
That is, it is possible to provide a folding guide that is arranged to face the end edge of the dough guide and causes the dough to be folded in a U-turn shape at the end edge. In this case, the air blowing means may be provided so as to blow air in a direction in which the cloth end faces the cloth after being folded back via the folding guide.

By doing in this way, even if it is a small-diameter cylindrical part etc. which are formed in a lower article (for example, a hem opening for passing a foot in a brief, etc.), the end of the cloth is folded and sewed into an edge shape. The work can be done automatically.
It is preferable to provide a cloth receiving member for receiving the cloth folded back by the folding guide at the lower part of the cloth guide. In this case, the upper and lower gaps between the fabric guide and the fabric receiving member are formed with dimensions wider than the thickness of the stitched portion provided to intersect the fabric feeding direction.
In this way, even when a stitched portion that intersects the fabric end is formed in the circumferential direction of the small-diameter cylindrical portion, the fabric end is passed through the vertical gap between the fabric guide and the fabric receiving member. This makes it easy and reliable, and the stitched portion is not caught and clogged by the upper and lower gaps. As a result, the end of the fabric is folded and sewn into an edged shape automatically.

Bending assisting means can be provided on the secondary side in the fabric feed direction with respect to the needle position of the sewing machine.
In this case, the folding assisting means includes a secondary side fabric guide that can hold the fabric that has passed through the needle position of the sewing machine in a flat state, and an end facing the end of the secondary side fabric guide. The secondary side folding guide that folds the fabric in a U-turn shape at the edge, and the fabric end faces the fabric that is folded back through the secondary side folding guide and along the lower surface of the secondary side fabric guide. Having secondary air blowing means for blowing air in a direction, and an entry / exit adjusting means capable of applying hand-feeding drive to the fabric in a direction opposite to the direction in which the fabric edge is extended by the secondary air blowing means Is preferable.

When such a folding assisting means is provided, the folding guide means is used as a main stage with the dough guide and the folding guide provided on the primary side from the needle position, and the dough assisting means provides support for the main stage. (Intermediate) It becomes a stage and comes to fold the end of the dough.
As a result, the cloth edge of the cloth can be folded back to a predetermined width mechanically and automatically without any manual work by the operator. Accordingly, there is an advantage that the work burden on the worker is reduced and the efficiency of the work is improved.

A cloth separating means can be provided at a location on the primary side in the cloth feeding direction with respect to the needle position of the sewing machine. The cloth separating means includes an entry / exit adjusting means capable of giving a hand-feeding drive to the cloth in a direction opposite to a direction in which the cloth edge is extended by the air blowing means, and a cloth for feeding the cloth set on the cloth guide to the needle position. It is preferable to have a feeding means.
By doing so, it is possible to easily adjust the folding width to be constant when folding the fabric edge. In addition, it becomes possible to feed the fabric more smoothly and reliably.

The fabric feeding means may have a feeding rotor that rotates along the fabric feeding direction. At the same time, the entry / exit adjustment means has an entry / exit driving body that generates a driving force in the direction in which the dough is fed, and the entry / exit driving body is mutually predetermined in the rotation direction with respect to the feed rotor of the dough feeding means. A plurality may be provided at intervals.
That is, since the entrance / exit adjusting means is incorporated in the feed rotor of the dough feeding means, the dough feeding means and the entrance / exit adjusting means can be handled as a single mechanism or device in appearance. Simplification and compactness can be further enhanced. Therefore, even when it is difficult to secure a space around the sewing machine, it is possible to install the cloth feeding means and the entrance / exit adjusting means.

A plurality of fabric hooking portions may be provided in the center of the needle position of the sewing machine so that the cylindrical fabric can be held while being enlarged in the radial direction between the primary side and the secondary side. By doing so, the cylindrical fabric can be stably held.
On the other hand, the cloth edge sewing method according to the present invention sets the cloth on a cloth guide that can hold the cloth in a flat state toward the needle position of the sewing machine, and blows air on the cloth to guide the cloth edge. The cloth is stretched toward a predetermined position, and the cloth is fed by a hand drive that is opposite to the direction in which the cloth edge is extended until the cloth edge detection unit detects that the cloth edge matches the predetermined position. The fabric is fed along the fabric guide to the needle position and sewed while maintaining the state where the fabric edge matches the predetermined position.

  The fabric is set against the fabric guide so that the fabric is folded in a U-turn shape at the edge of the fabric guide, and the air is blown so that the fabric is stretched in the direction in which the folded fabric edge faces. It is preferable that the hand-drawing drive is applied in a direction that shortens the amount of folding from the edge of the dough guide.

  In the fabric edge sewing device and the fabric edge sewing method according to the present invention, the fabric edge can be formed even in a small-diameter cylindrical portion or the like (such as a hem opening for passing a foot in a brief) as formed in a lower article. It is possible to automatically fold and sew it into a border shape, and to obtain a reliable and beautiful finish.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 thru | or FIG. 7 has shown one Embodiment of the fabric edge sewing apparatus 1 which concerns on this invention. As shown in FIG. 7, the fabric W to be sewn in this embodiment is a brief, and the sewing location is a pair of left and right hem ports (small-diameter cylindrical portions) formed on the hem of the brief. The ends were folded back to a predetermined width and sewn into a border shape. Since the brief is formed by sewing a plurality of fabric parts, two or more stitched portions (thickened) intersecting the fabric edge are formed in the circumferential direction of the hem opening.
[overall structure]
As apparent from FIGS. 2 to 4, the fabric edge sewing device 1 according to the present invention has a fabric guide 5, an air spraying means 6, a fabric edge detecting unit 7, an entry / exit adjusting means 8 around the sewing machine 2. A dough feeding means 9 is provided. Further, on the primary side (right side in FIG. 2) with respect to the cloth feeding direction at the position where the sewing needle 10 (see FIG. 2) moves up and down (hereinafter referred to as “needle position S”) with respect to the sewing machine 2. A cloth separating means 13 is provided, and a folding assist means 14 is provided on the secondary side (left side in FIG. 2).
[sewing machine]
In the sewing machine 2, the cloth W can be held on the front side of the needle position S. At this time, the cloth W is in a cylindrical shape centered on the needle position S while maintaining a flat state at the needle position S. A stable orbiting operation (cloth feeding toward the needle position S) can be performed in the open state.

In order to realize this, the fabrics are arranged at a plurality of upper and lower locations (two locations in the example) on the primary side of the needle position S and a plurality of upper and lower locations (two locations in the diagram) on the secondary side of the needle position S, respectively. A hanging portion 15 (15A to 15D) is provided. Of these, a predetermined pulling means for applying a drive for feeding the cloth to the cloth W with respect to a predetermined cloth hanging part 15 (the cloth hanging part 15A on the secondary side and the upper side of the needle position S in the illustrated example). 16 is provided.
In the present embodiment, each of the dough hanging portions 15 is formed as a roller shaft having a smooth outer peripheral surface and a partially spherical tip, and from the sewing machine 2 in a cantilevered state where the shaft center is substantially horizontal. It protrudes in the direction (see FIG. 7). The cloth hanging portions 15A and 15D positioned on the upper side on the primary side and the secondary side of the needle position S are adjusted so that the uppermost position on the outer peripheral surface is at the same level as the needle position S. The position S can be smoothly passed in a substantially horizontal plane state.

The leading means 16 has a roller head 18 supported on a slide support base 17 so as to be slidable in the direction of approaching and moving away from the cloth hanging portion 15A. A pinch roller 20 that is rotationally driven is provided. Accordingly, the roller head 18 is advanced until the pinch roller 20 comes into contact with the cloth W covered on the outer peripheral surface of the cloth hooking portion 15A, and the pinch roller 20 is driven to rotate by the motor 19, whereby the needle is applied to the cloth W. Driving that pulls out from the position S can be applied.
[Dough guide]
The cloth guide 5 is provided on the primary side in the cloth feeding direction with respect to the needle position S of the sewing machine 2 and holds the cloth W in a flat state at the needle position S and feeds the cloth W to the needle position S in this flat state. It is intended to maintain the state that is continuously.

As shown in FIG. 1, in the present embodiment, the fabric guide 5 is a plate-like one provided in an arrangement that supports the lower surface side of the fabric W. In the present embodiment, the fabric guide 5 is configured to fold the fabric W in a U-turn shape at the end edge portion 5a. Therefore, a bending guide 23 is arranged in an opposed state at the edge portion 5 a of the fabric guide 5, and a fabric receiving member 25 is provided at the lower portion of the fabric guide 5.
The fabric guide 5 is movable in the direction of entering and exiting the needle position S by an advance / retreat driving tool 27 such as an air cylinder provided on the sewing machine 2 side. By this movement, the end edge portion 5a of the cloth guide 5 moves in the front direction (downward in FIG. 3) from the needle position S, and the end edge portion 5a exceeds the needle position S and approaches the sewing machine 2 side. The two positions can be switched.

That is, when the edge portion 5a of the fabric guide 5 exceeds the needle position S and approaches the sewing machine 2 side, an action of folding the fabric W occurs, and the edge portion 5a of the fabric guide 5 is moved from the needle position S. When moved in the front direction (separated from the sewing machine 2), the action of folding the fabric W is stopped and the positional constraint on the fabric W is also released.
The edge 5a of the fabric guide 5 is moved in the front direction from the needle position S just before the sewing start position returns to the needle position S after the sewing at the needle position S progresses (that is, the cylindrical fabric). This prevents the sewing completion portion of the fabric W from being caught by the fabric guide 5.

The folding guide 23 assists in folding the fabric W in a U-turn shape at the edge portion 5a of the fabric guide 5. It is preferable that the surface of the dough guide 5 that faces the edge 5a is formed as an inwardly curved surface.
The cloth receiving member 25 is for receiving the cloth W folded by the bending guide 23 on the cloth receiving member 25 while inserting the cloth W between the cloth guide 5 and the cloth receiving member 25. For example, it is fixed in a state of projecting from the lower part of the bending guide 23 toward the dough guide 5. The dough receiving member 25 can be provided in a fixed relationship with the dough guide 5 while holding the vertical gap G below the dough guide 5.

Between the fabric guide 5 and the fabric receiving member 25, a vertical gap G wider than the thickness of the stitched portion provided to intersect the fabric feed direction with respect to the fabric W is formed. The thickness of the stitched portion varies depending on the material of the fabric W and the number of overlapped sheets, but the relationship is that the upper and lower gaps G are always larger regardless of the thickness of the stitched portion.
For this reason, when the fabric W is fed while being guided by the fabric guide 5, the fabric end of the fabric W is induced to bend downward while causing contact interference with the folding guide 23. In particular, the cloth guide 5 is folded back by a predetermined width along the edge portion 5a.

Here, since the vertical gap G between the fabric guide 5 and the fabric receiving member 25 is wider than the stitched portion of the fabric W, the stitched portion may be caught or clogged in the vertical gap G. There is no.
[Air spraying means]
The air blowing means 6 is a place in which the fabric end of the fabric W is extended in the direction of entering and exiting the needle position S by blowing air to the fabric W held in a flat state by the fabric guide 5.

In the present embodiment, air is supplied in a direction (a direction from right to left in FIG. 1) in which the end of the fabric is directed to the fabric W that is folded from the folding guide 23 and extends along the lower surface of the fabric guide 5. I try to spray it. The air ejection hole 28 is provided on the inner curved surface of the bending guide 23 so as to face the lower surface of the fabric guide 5, and air is supplied to the ejection hole 28 through an air passage 29 provided in the bending guide 23. Is to be guided.
The air blown out from the ejection holes 28 is also blown to the entire fabric W after extending the fabric end of the fabric W. As a result, the cloth W as a whole is stretched from the sewing machine 2 in the direction of the front, so that the cloth W is prevented from being entangled with the sewing machine 2 or twisted in the cloth W itself.
[Fabric edge detector]
The cloth edge detection unit 7 is for detecting a state in which the cloth edge of the cloth W is aligned with a predetermined position of the cloth guide 5 in the entry / exit direction with respect to the needle position S (the direction in and out). Various non-contact type sensors are employed, including photo sensors such as molds.

As described above, in this embodiment, the fabric edge is folded back to the lower surface of the fabric guide 5, so that a transmission hole 26 is provided at a predetermined position of the fabric receiving member 25, and from below the fabric receiving member 25. The presence / absence of the fabric edge at the folding position can be detected.
[In / out adjustment means and dough feeding means]
The entrance / exit adjustment means 8 is a direction in which the fabric end is extended by the air blowing means 6 so that the fabric end of the fabric W held in a flat state by the fabric guide 5 matches a predetermined position in the exit / entry direction with respect to the needle position S. In the opposite direction, a drive for picking up the fabric W is applied.

The “hand feeding drive” by the entrance / exit adjusting means 8 is a drive that is generated in a direction opposite to the moving force when a moving force is generated in the fabric W as the fabric end of the fabric W is extended. In this case, it is assumed that the moving direction by the “moving force generated in the fabric W” and the “hand-drawing driving” are both determined with reference to the position where the entrance / exit adjusting means 8 is provided.
In addition, if reverse drive is generated by the entrance / exit adjusting means 8, the cloth W can be quickly pushed out in the direction in which the cloth edge is extended by the air blowing means 6 and in the forward direction.

The fabric feeding means 9 is for applying a main drive for feeding the fabric W held in a flat state by the fabric guide 5 toward the needle position S.
In the present embodiment, the entrance / exit adjusting means 8 and the dough feeding means 9 are combined with each other to form one device in appearance.
That is, as shown in FIGS. 1, 5, and 6, the dough feeding means 9 has a feed rotor 32 that is driven by a motor 30 via a transmission portion 31 such as a timing belt and is rotatable. The entry / exit adjustment means 8 has a plurality of entry / exit driving bodies 35 provided at predetermined intervals in the rotational direction with respect to the feed rotor 32 of the dough feed means 9.

  In the present embodiment, each of the entry / exit driving bodies 35 is formed in a disc shape. Each of the entrance / exit driving bodies 35 is provided with a rotation axis in a state of passing through the center of the circle, and each of the rotation axes is directed tangential to an outer circumference circle along the rotation direction of the feed rotor 32. ing. That is, when the feed rotor 32 is viewed from the front along the axis of rotation thereof (see FIG. 6), the drive-in / out bodies 35 are arranged such that their diametrical directions are radial with respect to the feed rotor 32. In addition, when the feed rotor 32 is viewed from the side (see FIGS. 1 and 5), the outer periphery of the drive-out driving body 35 protruding from the feed rotor 32 may exert a rotational force along the rotation axis of the feed rotor 32. It can be seen that the layout is correct.

Each entry / exit driving body 35 is driven to rotate by a motor 36 different from the rotational drive of the feed rotor 32 via a transmission unit 37 such as a timing belt.
The rotation direction of the feed rotor 32 is set along the cloth feeding direction toward the needle position S of the sewing machine 2 (see FIG. 2). Therefore, the rotation direction of the entrance / exit driving body 35 is relative to the needle position S of the sewing machine 2. The driving force is generated in the entry / exit direction (including at least the hand-feeding direction of the fabric W).
The entrance / exit adjusting means 8 and the cloth feeding means 9 configured as described above are directed upward with respect to the cloth guide 5 by an elevating means 40 (see FIG. 2) employing an air cylinder, a motor driving mechanism or the like. It can move up and down.

When the entry / exit adjustment means 8 and the dough feeding means 9 are lowered by the elevating means 40, the entry / exit driving body 35 of the entry / exit adjustment means 8 sandwiches the dough W between the dough guide 5 and lightly contacts the dough W. Become. When the elevating / lowering means 40 raises the entrance / exit adjusting means 8 and the dough feeding means 9, the contact with the dough W by the entrance / exit driving body 35 is released and the dough guide 5 is opened so that the dough W can be attached and detached. A convenient space spreads out.
For example, if the drive part is equipped with a clutch mechanism that can be controlled to be turned on / off in the entry / exit adjustment means 8, the air blowing means 6 can be used to blow air by making the drive part clutch-off (idling state). It is also possible to extrude the dough W in the blowing direction and the forward direction.
[Fabric handling means]
The cloth separating means 13 is provided on the primary side in the cloth feeding direction with respect to the needle position S of the sewing machine 2 and assists the introduction of the cloth W with respect to the needle position S. The position where the cloth separating means 13 is provided is a position facing the cloth W which is stretched from the cloth hanging part 15C on the secondary side and the lower side to the cloth hanging part 15D on the upper side. On the sewing machine 2 side, a receiving plate 43 is provided between the fabric hanging portion 15C and the fabric hanging portion 15D, and the receiving plate 43 and the fabric separating means 13 are opposed to each other with the fabric W interposed therebetween. Yes.

The cloth separating means 13 has an entry / exit adjusting means 8 and a cloth feeding means 9. For this reason, the entrance / exit adjusting means 8 can give a drive for pulling the dough W in the direction opposite to the direction in which the end of the dough is extended by the air blowing means 6. The fabric W held in a flat state by 5 can be fed toward the needle position S.
The specific structure is substantially the same as the entrance / exit adjustment means 8 and the fabric feed means 9 shown in FIGS. 1, 5 and 6, and a plurality of entrance / exit adjustment means 8 as the entrance / exit adjustment means 8 is provided in the feed rotor 32 as the fabric feed means 9. The driving body 35 is combined to form one device in appearance.

The cloth separating means 13 is movable in a direction approaching and moving away from the receiving plate 43 by a moving means 45 employing an air cylinder, an appropriate motor drive mechanism, or the like. In a state in which the cloth separating means 13 is close to the receiving plate 43 by the moving means 45, the entrance / exit driving body 35 of the access adjusting means 8 sandwiches the cloth W between the receiving plate 43 and comes into light contact with the cloth W. Further, when the cloth separating means 13 is separated from the receiving plate 43 by the moving means 45, the contact with the cloth W by the entrance / exit driving body 35 is released, and the side of the receiving plate 43 is opened so that the cloth W can be attached and detached. A convenient space spreads out.
[Bending aid]
The folding assisting means 14 is provided on the secondary side in the cloth feeding direction with respect to the needle position S of the sewing machine 2. The folding auxiliary means 14 includes a secondary side fabric guide 47, a secondary side bending guide 52, a secondary side air blowing means 53, and an entrance / exit adjusting means 8.

The secondary side fabric guide 47 is provided so as to protrude from the sewing machine 2 side between the fabric position 15A, which is the primary side and the upper side, from the needle position S of the sewing machine 2 and the horizontal position of the needle position S of the sewing machine 2. The cloth W that has passed the needle position S of the sewing machine 2 is held in a flat state.
As shown in FIG. 3, the secondary side fabric guide 47 is movable in the direction of entering and exiting the needle position S by appropriate advancing / retreating means 51 such as an air cylinder provided on the sewing machine 2 side. As a result of this movement, the end edge 47a facing the sewing machine 2 in the secondary side fabric guide 47 moves in the front direction (downward in FIG. 3) from the needle position S, and the end edge 47a is in the needle position. The two positions of the state of approaching the sewing machine 2 side beyond S are switched.

That is, when the edge 47a of the secondary side fabric guide 47 exceeds the needle position S and approaches the sewing machine 2 side, an action of folding the fabric W occurs. When 47a moves (separates) from the needle position S in the front direction, the action of folding the fabric W is stopped and the positional constraint on the fabric W is also released.
The edge 47a of the secondary side fabric guide 47 is moved in the front direction from the needle position S when sewing at the needle position S is started (substantially simultaneously).
The secondary side bending guide 52 is arranged in a state of facing the end edge portion 47a of the secondary side fabric guide 47, and assists in folding the fabric W in a U-turn shape at the end edge portion 47a. It is preferable that the surface of the secondary side fabric guide 47 facing the end edge portion 47a is formed as an inwardly curved surface.

The secondary side air blowing means 53 blows air in a direction in which the end of the cloth is directed to the cloth W which is folded back through the secondary side bending guide 52 and is along the lower surface of the secondary side cloth guide 47. It has become.
The entry / exit adjustment means 8 can apply a drag driving to the dough W in the direction opposite to the direction in which the end of the dough is extended by the secondary air blowing means 53. As the entrance / exit adjustment means 8, substantially the same as the entry / exit adjustment means 8 shown in FIGS. 1, 5, and 6 can be adopted. Further, the material feeding means 9 may be combined with the access adjusting means 8.

  The entrance / exit adjusting means 8 and the dough feeding means 9 can be moved up and down above the secondary dough guide 47 by appropriate lifting means 49 such as an air cylinder. In a state in which the folding assisting means 14 is lowered by the lifting and lowering means 49, the entrance / exit driving body 35 of the entrance / exit adjusting means 8 sandwiches the fabric W between the secondary side fabric guide 47 and comes into light contact with the fabric W. When the folding assisting means 14 is raised by the elevating means 49, the contact with the fabric W by the entrance / exit driving body 35 is released, and the upper side of the secondary side fabric guide 47 is opened, which is convenient for attaching and detaching the fabric W. The space is expanding.

  When such a folding assisting means 14 is provided, the folding assisting means 14 is adapted so that the fabric end of the fabric W is folded using the fabric guide 5 and the folding guide 23 provided on the primary side from the needle position S as the main stage. As a result, the fabric end of the fabric W can be folded back as a support (intermediate) stage for the main stage. As a result, the fabric end of the fabric W can be folded back to a predetermined width without any manual operation by the operator. It can be done mechanically and automatically. Accordingly, there is an advantage that the work burden on the worker is reduced and the efficiency of the work is improved.

Further, since the fabric feeding means 9 is also combined with the entry / exit adjusting means 8, the fabric W held in a flat state by the secondary side fabric guide 47 is driven along the fabric feeding direction (sewing is started). (Positioning drive up to) can also be given.
[Fabric sewing method]
Next, the fabric edge sewing method according to the present invention will be described based on the usage situation of the fabric edge sewing apparatus 1 having the above-described configuration.
First, when the fabric edge sewing device 1 is stopped, as shown in FIG. 2, the entrance / exit adjusting means 8 and the fabric feed means 9 are raised with respect to the fabric guide 5, and the entrance / exit adjusting means 8 of the folding auxiliary means 14 is also two. Ascending from the next dough guide 47, the dough separating means 13 is separated from the receiving plate 43, and the leading means 16 is also retracted.

From this state, as a manual operation by the operator, the tubular portion of the fabric W is passed over the fabric hooking portion 15 (15A to 15D) of the sewing machine 2, and the fabric end to be sewn is set toward the needle position S of the sewing machine 2. (See FIG. 7A). And an operator performs operation start operation.
Then, first, the fabric guide 5 is brought close to the folding guide 23 and the air blowing means 6 is operated so that air is ejected from the ejection hole 28 of the folding guide 23 toward the lower surface of the fabric guide 5. Become.
Therefore, the fabric W is folded in a U-turn shape at the end portion 5a of the fabric guide 5 while interfering with the folding guide 23, and is drawn into the vertical gap G between the lower surface of the fabric guide 5 and the fabric receiving member 25. Become. Then, the fabric end is extended in the front direction of the needle position S (direction away from the folding guide 23).

Further, the entrance / exit adjusting means 8 and the fabric feed means 9 are lowered toward the upper surface of the fabric guide 5, the fabric W is sandwiched between the entrance / exit driving body 35 of the entrance / exit adjusting means 8 and the fabric guide 5, and the entrance / exit driving body 35 is also moved. Comes into light contact with the fabric W.
At this time, if the cloth edge of the cloth W is detected by the cloth edge detecting section 7, the entrance / exit adjusting means 8 is operated, and the direction opposite to the direction in which the cloth edge is extended by the air blowing means 6 with respect to the cloth W. The drag driving which becomes becomes is given.
That is, since the air blowing by the air blowing means 6 is performed on the lower surface of the fabric guide 5, the movement direction of the fabric W viewed on the lower surface of the fabric guide 5 is the direction from the right to the left in FIG. (See arrow F1).

However, since the fabric W is folded in a U-turn shape at the end portion 5a of the fabric guide 5, the movement direction of the fabric W viewed from the upper surface of the fabric guide 5 is the direction from the left to the right in FIG. (See arrow F2). Since the entrance / exit adjustment means 8 is in contact with the fabric W on the upper surface side of the fabric guide 5, the movement direction of the fabric W viewed from the entrance / exit adjustment means 8 is the direction of the arrow F2. The direction of the arrow F2 is “the direction in which the fabric end is extended by the air blowing means 6 with respect to the fabric W”.
Therefore, the above-mentioned “hand-carrying drive” applied to the fabric W by the entrance / exit adjustment means 8 is the direction from the right to the left in FIG. 1 (that is, the arrow F3 opposite to the arrow F2). It becomes.

When the fabric edge detection unit 7 no longer detects the fabric edge of the fabric W by the hand-feeding drive of the entrance / exit adjustment means 8 as described above, the entrance / exit adjustment device 8 performs reverse rotation driving so that the fabric edge of the fabric W is blown with air. The means 6 pushes the fabric end in the forward direction (see arrow F2).
When the fabric end of the fabric W is detected by the fabric end detection unit 7 by this extrusion, the entry / exit adjusting means 8 is actuated again to give the fabric W a hand drive (arrow F3). By repeating this, the fabric edge of the fabric W is held at a predetermined position (detected position by the fabric edge detection unit 7) with respect to the fabric guide 5.

Also, the folding assisting means 14 performs a series of operations similar to the above, and the fabric W is folded back in a U-turn shape with respect to the secondary side fabric guide 47, and the fabric end is on the lower surface of the secondary side fabric guide 47. It will be in the state hold | maintained to the predetermined position (refer FIG. 7 (B) above).
On the other hand, the cloth separating means 13 approaches the receiving plate 43 and sandwiches the cloth W, and the leading means 16 also approaches the cloth hanging portion 15A and presses the pinch roller 20 against the cloth W.
Next, starting with the operation of the dough feeding means 9 with respect to the dough guide 5, the respective movements by the dough handling means 13 and the leading means 16 cause the entire dough W to move in the circumferential direction (rotation) according to the cylindrical shape, The cloth feed to the needle position S along the cloth guide 5 and the secondary cloth guide 47 is performed.

The sewing machine 2 starts sewing simultaneously with the feeding of the cloth. Almost simultaneously with the start of sewing, the folding assisting means 14 returns to the retracted state (that is, the role as the folding assisting means 14 ends at this point).
In this way, the folded portion formed on the fabric W is sewn at the needle position S of the sewing machine 2. Even after the start of sewing, the fabric end position control by the fabric entry / exit adjusting means 8 and the fabric end detecting unit 7 and the interlocking of the entry / exit adjusting means 8 by the fabric separating means 13 are carried out, and the fabric guide is thus implemented. The fabric edge of the fabric W is kept constant with respect to the predetermined position of 5.

In the fabric guide 5, the air blown from the ejection holes 28 of the air blowing means 6 extends the fabric end of the fabric W and then sprays the entire fabric W, and the fabric W as a whole is the sewing machine 2. It will be in the state extended like a windsock toward the front direction from. Therefore, it is possible to reliably prevent the fabric W from being entangled with the sewing machine 2 and the fabric W itself from being twisted.
In the fabric W, the fabric guide 5 is moved (separated) in the front direction from the needle position S immediately before the sewing start position returns to the needle position S (that is, immediately before the cylindrical fabric end makes a full turn). The Thereby, the sewing part of the fabric W is prevented from being caught by the fabric guide 5. Thus, the sewing is completed when the fabric end of the fabric W exceeds one cycle with respect to the needle position S and the sewing start position and the sewing end position overlap each other by a predetermined amount.

Thereafter, the entrance / exit adjusting means 8 and the fabric feeding means 9 with respect to the fabric guide 5 are lifted, the air blowing means 6 is stopped, the fabric separating means 13 is separated from the receiving plate 43, the retracting means 16 is retracted, and the yarn at the needle position S Cutting and the like are performed, and the cloth W after the sewing is completed is taken out from the sewing machine 2. This completes one cycle of the sewing work.
As is apparent from the above detailed description, in the fabric edge sewing method according to the present invention, the fabric W is set to the fabric guide 5 so that the fabric W is folded in a U-turn shape at the edge of the fabric guide 5; The blowing of air is performed so that the fabric W is stretched in the direction in which the fabric end after folding is directed, and the hand feeding drive to the fabric W is applied in a direction to shorten the folding amount from the end edge portion 5a of the fabric guide 5. To do.

In this way, the fabric W is moved in one direction using the air blowing pressure by the air blowing means 6, and the fabric W is pulled back by a necessary amount by the mechanical driving force by the entrance / exit adjusting means 8, Since the alignment of the fabric W can be performed, the fabric end of the fabric W can be accurately and quickly matched to a predetermined position based on the needle position S or the like.
Therefore, even in the case of a small-diameter cylindrical portion or the like that is formed in a lower article (for example, a hem opening for passing a foot in a brief, etc.), the work of automatically folding back the fabric end and sewing it into a border shape is automatically performed. You can do it, and you will get a reliable and beautiful finish.

By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.
In this invention, it is not limited that the sewing location of the fabric W is cylindrical. Needless to say, numerical values are not particularly limited for the cylindrical diameter in the case of the cylindrical shape.
In the present invention, there is no particular limitation on folding back the fabric end (sewing location) of the fabric W.

It is the figure which expanded the C section of FIG. 4, and partially crushed and demonstrated the sewing condition of cloth. It is the front view which showed one Embodiment of the fabric edge sewing apparatus which concerns on this invention. It is an AA arrow directional view of FIG. It is a BB line arrow directional view of FIG. FIG. 3 is a view taken along line DD in FIG. 2. It is the EE arrow directional view of FIG. (A) is the perspective view explaining the condition before mounting | wearing a cloth with a sewing machine, (B) is the perspective view explaining the condition which starts sewing. It is a perspective view explaining the situation during sewing of cloth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Material edge sewing apparatus 2 Sewing machine 5 Material guide 5a End edge part 6 Air spraying means 7 Material edge detection part 8 Incoming / outgoing adjustment means 9 Material feeding means 13 Material distribution means 14 Folding auxiliary means 15 Material hooking part 23 Bending guide 25 Material receiving member 32 Feeding rotor 35 Drive-in / out drive body 47 Secondary side fabric guide 47a End edge 53 Secondary side air blowing means W Fabric S Needle position

Claims (9)

Sewing machine (2),
A cloth guide (5) that can hold the cloth (W) in a flat state toward the needle position (S) of the sewing machine (2);
Cloth feeding means (9) for feeding the cloth (W) held in a flat state by the cloth guide (5) to the needle position (S);
The fabric end of the fabric (W) is moved in the direction of entering and exiting the needle position (S) by blowing air to the fabric (W) held in a flat state by the fabric guide (5) in a plane orthogonal to the fabric feed direction. Air blowing means (6) for extending;
An entry / exit adjustment means (8) capable of applying a hand drive to the fabric (W) in the direction opposite to the direction in which the fabric edge is extended by the air blowing means (6),
A cloth edge detecting section (7) for detecting a state in which the cloth edge matches a predetermined position of the cloth guide (5) in the direction of entering and exiting the needle position (S);
A fabric edge sewing device characterized by comprising:   A bending guide (23) for folding the dough (W) in a U-turn shape at the end edge (5a) in an arrangement facing the end edge (5a) of the dough guide (5) is provided, The air blowing means (6) is provided so as to blow air in a direction in which a cloth end faces the cloth (W) after being folded back via the folding guide (23). Item 1. The fabric edge sewing device according to Item 1.   A fabric receiving member (25) for receiving the fabric (W) folded back by the folding guide (23) is provided below the fabric guide (5). The fabric guide (5) and the fabric receiving member (25) are provided. 3. The fabric according to claim 2, wherein an upper and lower gap (G) wider than a thickness of a stitched portion provided so as to intersect with the fabric feeding direction is formed between the upper and lower sides of the fabric (W). Edge sewing device. Bending auxiliary means (14) is provided on the secondary side in the cloth feeding direction with respect to the needle position (S) of the sewing machine (2),
This folding assist means (14)
A secondary side fabric guide (47) that allows the fabric (W) that has passed through the needle position (S) of the sewing machine (2) to be held in a flat state;
A secondary side bending guide (52) for folding the fabric (W) in a U-turn shape at the end edge portion (47a) in an arrangement facing the end edge portion (47a) of the secondary side fabric guide (47); ,
Secondary side air blowing that blows air in a direction in which the end of the fabric is directed to the fabric (W) that is folded back through the secondary side folding guide (52) and is along the lower surface of the secondary side fabric guide (47). Means (53);
An entry / exit adjustment means (8) capable of imparting hand-feeding drive to the fabric (W) in the direction opposite to the direction in which the fabric edge is extended by the secondary air blowing means (53),
The fabric end sewing device according to any one of claims 1 to 3, wherein the fabric end sewing device is provided. A cloth separating means (13) is provided at a location on the primary side of the cloth feeding direction with respect to the needle position (S) of the sewing machine (2),
This dough separating means (13)
An entry / exit adjustment means (8) capable of applying a drag drive to the fabric (W) in a direction opposite to the direction in which the fabric edge is extended by the air blowing means (6);
5. A fabric feeding means (9) for feeding the fabric (W) set on the fabric guide (5) to the needle position (S). The fabric edge sewing device according to Item.   The dough feeding means (9) has a feed rotor (32) that rotates along the dough feeding direction, and the in / out adjusting means (8) has a driving force in the hand feeding direction of the dough (W). And a plurality of drive-in / out drive bodies (35) that are spaced apart from each other in the rotational direction with respect to the feed rotor (32) of the dough feed means (9). The cloth edge sewing apparatus according to any one of claims 1 to 5, wherein the cloth edge sewing apparatus is provided.   A plurality of cloth hooks (W) that make it possible to hold the cloth (W) in a cylindrical shape between the primary side and the secondary side at the center of the needle position (S) of the sewing machine (2) while expanding in the radial direction ( 15) The fabric end sewing apparatus according to any one of claims 1 to 6, wherein 15) is provided. Set the fabric (W) to the fabric guide (5) that can hold the fabric (W) in a flat state toward the needle position (S) of the sewing machine (2),
By blowing air to the fabric (W), the fabric edge is extended toward a predetermined position on the fabric guide (5),
The fabric (W) is provided with a drag driving that is opposite to the direction in which the fabric end is extended until the fabric end detection unit (7) detects a state where the fabric end matches the predetermined position.
The fabric end sewing is characterized in that the fabric (W) is fed to the needle position (S) and sewed along the fabric guide (5) while maintaining the state where the fabric end matches the predetermined position. Method. The dough (W) is set to the dough guide (5) so that the dough (W) is folded in a U-turn shape at the edge (5a) of the dough guide (5).
Air blowing is performed so that the fabric (W) is stretched in the direction in which the fabric end after turning is facing,
9. The fabric edge sewing method according to claim 8, wherein the hand-feeding drive is applied to the fabric (W) in a direction in which the amount of folding from the end edge portion (5a) of the fabric guide (5) is shortened.

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