JP2001190879A - Triple-winding sewing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a triple-winding shape untill a cloth to be sewn reaches a position. SOLUTION: This device comprises an auxiliary binder 6 close to an upstream position of a triple-winnding binder 1 in the hem feeding direction, and in the device an upper end 6b1 of the auxiliary binder is adapted to hold an end W1 of cloth to be sewn W that is set in a condition to be folded into two, from below, when at least the binder 1 advances.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-roll sewing device for sewing a cloth, such as a hem of a trouser, into three rolls.

[0002]

2. Description of the Related Art As shown in FIG. 4, a three-piece sewing machine is configured such that a cloth end W1 of a sewing product W such as trousers is bent at a first bent end W2 and a second bent end W2.
Is folded inward at the bent end W3 to form a triple hem, and the triple wrapped portion w is sewn with two stitches (indicated by a dashed line) to prevent fraying of the hem I am trying to do it.

[0003] As one of such triple winding sewing machines, there is known a sewing machine shown in Japanese Patent Publication No. 3-78, in which the bottom of a tubular cloth is wound into three windings.

As shown in FIG. 5, MP is a sewing machine main body having two sewing needles 1P that move up and down.
Is moved up and down to form a seam in the triple winding w with the shuttle in the bed 2P. 3P is a cloth foot,
Reference numerals 4aP and 4bP denote upper and lower cloth feed rollers which hold the sewing product W and are rotatable by a pulse motor (not shown) to feed the sewing product W.

[0005] Reference numeral 5P denotes a rear guide roller for holding the sewn material W, which rotates with the feed of the sewn material W, and 6P for biasing the sewn material W from the inside to the outside to make it in a stretched state. It is a skirting roller and rotates with the feed of the sewing product W.

Reference numeral 7P denotes a detection sensor for detecting steps G, G formed when the front cloth and the rear cloth of the pants are sewn. The detection sensors 7P determine the exact positions of the steps G, G. As a result, it is possible to perform accurate position control based on the steps G, G.

Reference numeral 8P denotes a triple-wound binder, which moves in a direction perpendicular to the plane of the paper and forms a three-wound skirt.

Then, the operator first folds the annular hem of the sewing cloth W inward once, and the sewing cloth W is
P, the lower feed roller 4bP, the rear guide roller 5P, the skirting roller 6P, and the triple winding binder 8P (in FIG.
(Indicated by the dotted line). Next, when the apparatus is started, the triple winding binder 8P is moved from the near side to the far side in FIG. That is, from the state of FIG. 6A in which the first bent end W2 of the sewing cloth W abuts on the hem end guide 9P and is prevented from moving to the right, the cloth end W1 becomes the three-fold binder 8P. The state shown in FIG. 6B is obtained in which the three-wound portion w is formed by being wound along the curved surface 8aP. Thereafter, by sending the sewing cloth W in the hem feed direction (FIG. 5), the hem of the sewing cloth W is formed into three windings when passing sequentially through the three winding binder 8P, and the sewing needle 1P is located below (sewing position). The sewing to the hem (three winding part) is performed.

[0009]

However, in the conventional three-winding sewing device, as shown in FIG. 7, when the three-winding binder 8P is driven, the cloth end W1 is not reliably wound up. Sometimes it broke down to the other side. In such a case, the cloth end W1 is
There was a problem that the three-roll sewing could not be performed due to clogging in P.

Therefore, an object of the present invention is to stably supply three windings to a sewing position.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. According to the first aspect of the present invention, a hem of a sewn cloth is folded and set, and the hem of the sewn cloth is set at the cloth end. On the other hand, the three-fold binder is advanced, the cloth edge is wound into the two-folding by the curved part of the three-fold binder to form a three-fold part, and the sewing cloth is started to be fed and the sewing machine is started to operate. In a three-roll sewing apparatus for sequentially forming a three-roll portion through a three-roll binder and feeding and sewing the formed three-roll portion below a needle, the three-roll sewing device is disposed in the vicinity of the three-roll binder and has at least three Cloth holding means is provided for holding the cloth edge from below so that the cloth edge of the folded sewn cloth does not hang down when the binder advances.

Thus, the cloth holding means holds the cloth end from below when at least the triple winding binder advances, so that the triple winding binder can reliably wind the cloth end into the two-folded state. Therefore, it is ensured that the sewing cloth has a complete three-roll shape until the sewing cloth reaches the sewing position.

Therefore, it is possible to form a beautiful triple winding with a stable quality at the sewing position.

As the cloth holding means, for example, a means provided with an auxiliary binder directly in contact with the cloth end, or a means provided with an air discharge mechanism for blowing air from below toward the cloth end can be considered. .

The invention described in claim 2 is the first invention.
Is provided with an auxiliary binder which holds the cloth edge from below by contacting the cloth edge with the cloth edge.

Thus, since the auxiliary binder directly abuts on the cloth edge to prevent the cloth edge from sagging, it is possible to surely prevent the cloth from sagging irrespective of the flexibility of the cloth.

The auxiliary binder may be one that holds the cloth edge from below only when the triple winding binder advances, or one that continues to hold not only when the triple winding binder advances but also when the triple winding is formed. Further, the auxiliary binder may be a fixed type or a movable type which can move the cloth end so as to lift the cloth edge from below.

The invention described in claim 3 is the same as the invention described in claim 2.
The auxiliary binder described in (1) is located on the upstream side in the hem feed direction of the triple winding binder.

Thus, since the auxiliary binder is arranged on the upstream side in the hem feeding direction of the triple winding binder, the auxiliary binder may obstruct the hem formed into three windings through the triple winding binder during the hem feeding. And can be sent to the sewing position without breaking three windings.

The invention described in claim 4 is the same as the claim 2.
The auxiliary binder described in (1) is configured to hold the cloth edge from below even after the three-fold binder advances.

Thus, the three-fold binder can be wound around the cloth edge already facing upward by the auxiliary binder, so that even during sewing, the three-fold binder is completely wound until the sewing cloth reaches the sewing position. Can be formed.

Further, according to a fifth aspect of the present invention, the upper end of the auxiliary binder according to the fourth aspect is located below the upper surface of the end portion of the curved portion of the triple winding binder on the upstream side in the hem feeding direction. It is configured as follows.

[0023] Thus, since the cloth edge, whose hanging is prevented, is smoothly guided into the curved portion, it is possible to reliably form a complete three-roll before the sewing cloth reaches the sewing position.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction different from the present invention and the prior art is a construction for forming a triple winding (a triple winding forming apparatus).
The other configurations are the same, and a detailed description is omitted.

The triple winding forming apparatus of the present invention is shown in FIGS.
It is shown in (c).

Reference numeral 1 denotes a triple-wound binder, which is movable in the same manner as a conventional binder and has a hem formed into a triple-wound. That is, the three-fold binder 1 has an arrow FS,
The mounting base 2a is fixed to the front end of the slide base 2 movable in the BS direction in the FS direction, and a mounting stay 2a is provided on the front end side of the slide base 2 in the BS direction so as to extend upward along the longitudinal direction. The rod 4a of the binder drive cylinder 4 is connected to 2a via a fixed block 3. Thus, when the triple winding binder 1 drives the binder driving cylinder 4, the arrow F
Move in the S and BS directions. In addition, FIG.
In (b), the state in which the triple winding binder 1 has moved in the direction of the arrow FS is shown by a solid line, and the state in which it has moved in the direction of the arrow BS is shown by a two-dot chain line.

On the side surface of the triple winding binder 1 in the BS direction, a first curved portion 1a and a second curved portion 1b are formed so as to be depressed in the FS direction in order to form a triple winding. And the 1st bending part 1a located in the hem feed direction upstream is
It is formed so as to be gradually inclined in the BS direction as it goes in the hem feed direction.

Reference numeral 5 denotes a skirt end guide, which guides the skirt end (first bent end W2).

Reference numeral 6 denotes an auxiliary binder as a cloth holding means, which has a substantially U-shape having both ends positioned in the hem-feeding direction as shown in FIG. On the side, a bottom portion 6a is fixed to a sewing machine frame via a fixing plate 7 having an L-shaped cross section. The upper side portion 6b of the auxiliary binder 6 is formed so as to gradually incline upward along the upper surface of the triple winding binder 1 in the hem feed direction. The upper end 6b1 of the upper side 6b is shown in FIG.
As shown in (b), the first curved portion 1a is located below the curved portion end upper surface 1c, which is the upper surface of the upstream end of the hem feed direction. Further, as shown in FIG. 1A, when the triple winding binder 1 moves in the BS direction indicated by the two-dot chain line, the upper end 6b1 and the end of the first curved portion 1a on the upstream side in the hem feed direction are close to each other. It will be in the state of having done.

Reference numeral 8 denotes a sewing table, which is disposed downstream of the slide base 2 in the hem-feed direction and whose upper surface is parallel to the upper surface of the slide base 2.

The operation of the above configuration will be described below.

Before setting the sewing cloth, the rod 4a of the binder driving cylinder 4 projects, and the triple winding binder 1
Located in the direction.

The operator folds the cloth edge W1 of the sewing cloth W inward and sets it on the apparatus as shown in FIG. Then, the sewing cloth W is in a state where the first bent end W2 is in contact with the skirt end guide 5 and the cloth end W1 is on the upper side 6b of the auxiliary binder 6. As a result, as shown in FIG. 2B, the cloth end W1 of the sewing cloth W also faces upward without sagging downward at the second curved portion 1b.

When started in this state, the rod 4a of the binder driving cylinder 4 is immersed, and the triple winding binder 1 moves in the BS direction as shown in FIG. As a result, as shown in FIG.
and is wound along the line b to form three windings. At this time, since the cloth edge W1 is directed upward by the auxiliary binder 6, the cloth edge W1 does not drop downward.

In the present invention, the upper side 6b of the auxiliary binder 6
Is formed so as to gradually incline upward along the upper surface of the triple winding binder 1 in the hem-feeding direction, and the cloth end W1 of the sewing product W is sent along this inclination, so that it is smooth. Can be guided upward.

Also, the upper end 6b1 of the upper side 6b is shown in FIG.
As shown in (b), the curved portion end upper surface 1c of the first curved portion 1a
Since the cloth edge is located lower than the upper end portion 6b, the cloth edge moving along the upper side portion 6b can be smoothly guided into the first curved portion 1a of the triple winding binder 1.

Further, since the upper end 6b1 of the auxiliary binder 6 is close to the first curved portion 1a of the triple winding binder 1,
The cloth edge W1 is reliably guided to the triple winding binder 1 with the cloth end W1 being lifted upward at the upper end 6b1.

Further, as shown in FIG. 3A, the upper side portion 6b of the auxiliary binder 6 guides the cloth end W1 upward even after the triple winding binder 1 moves in the BS direction. Therefore, the subsequent winding of the cloth edge W1 is smooth.

It is needless to say that the present invention is not limited to the above embodiment, but can be variously modified without departing from the gist of the invention. For example, in the present embodiment, the auxiliary binder is arranged close to the triple winding binder, but if it is far away, there is a fear that the held cloth edge may hang down again before reaching the triple winding binder. For this reason, it is desirable that such proximity is ensured in order to reliably feed the triple-winding binder while holding the cloth edge, but it is desirable to move the triple-winding binder while holding the cloth edge. It is not always necessary to be close as long as it can be fed, but it is sufficient if it is near the triple winding binder.

[0040]

According to the first aspect of the present invention, the cloth edge is held from below at least when the triple winding binder advances, so that the cloth edge is securely held when the triple winding binder advances. Since the sewn cloth can be wrapped in two, it is ensured that the sewn cloth has a three-fold shape before reaching the sewing position.

Therefore, it is possible to form a beautiful triple winding having a stable quality at the sewing position.

According to the second aspect of the present invention, the auxiliary binder as the cloth holding means directly abuts on the cloth end to prevent the cloth end from hanging down. Even if it is a fabric, it can be surely prevented from sagging.

According to the third aspect of the present invention, since the auxiliary binder is disposed on the upstream side in the hem feeding direction of the three-winding binder, the three windings pass through the three-winding binder during the hem feeding. It can be sent to the sewing position without breaking the three windings without disturbing the cut hem.

According to the fourth aspect of the present invention, since the three-winding binder only needs to wrap the cloth end already facing upward by the auxiliary binder, the sewing cloth is kept at the sewing position even at the time of sewing. It is possible to reliably form a complete triple winding before reaching.

Further, according to the invention described in claim 5,
Since the cloth edge directed upward is smoothly guided into the curved portion, it is possible to reliably form a complete triple winding by the time the sewing cloth reaches the sewing position.

[Brief description of the drawings]

FIG. 1 is a three-view drawing of a triple winding forming apparatus applied to a triple winding sewing apparatus of the present invention. (A) Top view (b) Front view (c) Side view

FIG. 2 is a diagram illustrating a state before driving a triple winding binder.
(A) Front partial enlarged view (b) AA sectional view of FIG. 1 (a)

FIG. 3 is a diagram showing a state after driving a triple winding binder.
(A) Front partial enlarged view (b) AA sectional view of FIG. 1 (a)

FIG. 4 is a view for explaining three winding sewing.

FIG. 5 is a schematic front view of a conventional triple winding sewing apparatus.

FIG. 6 is a diagram showing a state of triple winding formed by a triple winding binder. (A) Cross-sectional view before driving the triple winding binder (b) Cross-sectional view after driving the triple winding binder

FIG. 7 is a cross-sectional view illustrating a state in which the cloth edge has been bent downward and three windings have failed.

[Explanation of symbols]

1 ····· Triple winding binder 1a ····· 1st curved portion (curved portion) 1b ····· 2nd curved portion (curved portion) 1c ····· Curved portion end upper surface 2 ··· ... Slide base 4 ... Binder drive cylinder 5 ... Hem end guide 6 ... Auxiliary binder (cloth holding means) 6b1 ... Fixing plate 8 .... Sewing table

Claims (5)

[Claims] 1. A hem of a sewing cloth is set in a state of being folded in two, and a triple winding binder is advanced to a cloth end of the cloth, and the cloth end is bent into the two-fold by a curved portion of the triple winding binder. The three windings are formed by winding the sewing cloth and the sewing machine is started.The hem is sequentially passed through the three winding binder to form the three windings, and the formed three windings are fed below the needle. In the triple winding sewing device to be sewn, the sewing machine is disposed near the triple winding binder, and at least when the triple winding binder advances, the cloth edge of the folded sewn cloth does not hang down. A triple winding sewing device comprising a cloth holding means for holding a cloth end from below. 2. The triple winding sewing apparatus according to claim 1, further comprising an auxiliary binder that holds the cloth edge from below by contacting the cloth holding means with the cloth edge. 3. The triple winding sewing apparatus according to claim 2, wherein the auxiliary binder is located upstream of the triple winding binder in the hem-feeding direction. 4. The triple winding sewing apparatus according to claim 2, wherein the auxiliary binder holds the cloth edge from below even after the triple winding binder advances. 5. The triple winding according to claim 4, wherein an upper end of the auxiliary binder is located below an upper surface of an end of the curved portion of the triple winding binder on an upstream side in a hem-feeding direction. Sewing equipment.