JP2908382B2 - Bag manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bag, and is devised so as to give the bag a shape-retaining strength and an elegant edging pattern.

[0002]

2. Description of the Related Art As a bag for carrying a woman or a shoulder bag, as shown in FIG. 12, a substantially L-shaped bent piece (1a) facing the edge of a main body (1) and a gusset (2). It is known that a U-shaped folded back piece (2a) facing back is laminated on the corresponding edge portion and sewn into a total of three layers.

[0003]

However, the bag of the above embodiment has a tall post-type bed (3) as shown in FIGS. 13 to 15, and a double-blade or fork-shaped fork foot (4). Using a special sewing machine for three-dimensional sewing products (commonly known as a post sewing machine) (5), the folded piece (1a) of the main body (1) is unfolded onto the post-type bed (3) as shown in FIG. Unless the folded polymer pieces (2a) of the gusset (2) are stacked and pressed down stably by the rough surface (4a) of the dough foot (4), the sewing operation cannot be performed correctly and efficiently. That is,
A special and expensive post sewing machine (5) for three-dimensional sewing products is indispensable. (6) shows the sewing needle of the post sewing machine (5).

[0004] In particular, when a flexible or thin cloth material is used and a reinforcing core is inserted into the gusset (2) to finish the bag with a high shape-retaining strength, the above stitching operation becomes more and more troublesome. And difficulties,
An operator who does not have a high level of skill and abundant experience cannot easily produce a bag with high shape retention strength.

[0005] Further, even if the main body (1) and the gusset (2) can be stitched together by using the special and expensive dedicated post sewing machine (5), the main body (1) can be stitched. The folded piece (1a) and the folded superposed piece (2a) of the gusset (2) are stitched by a single row of stitches (7) as an equivalent seam allowance (L), so that the stitch (7) is the main body (1). ) Is not exposed at all from the front,
It only appears along the edge of the gusset (2).

As a result, the stitch (7) cannot be effectively used as a rim pattern of the bag yet, and there is a problem that an elegant design specification with a variety of interests cannot be easily obtained.

[0007]

SUMMARY OF THE INVENTION The present invention contemplates an improvement in such a problem, and as a method of manufacturing a bag useful for this purpose, an edge portion of a main body and a reinforcing core are attached in a backing state. The corresponding edge of the gusset is sewn by the first stitch in the vertical position relationship where the latter is stacked on the former, and then the gusset is folded back in the direction in which the reinforcing core is wrapped and sewn to the tip of the folded piece. Is further folded in the same direction in which the reinforcing core is present, so that the folded piece of the body and the folded piece of the gusset are kept in a staircase in the vertical positional relationship in which the latter is wider, and While pressing down the main body located at the top, to the gusset folded piece located at the bottom,
The second so that the wrapped reinforcing core also penetrates
By sewn the stitch, its penetrated second
It is characterized in that both ends of the stitch are exposed from the front side of the gusset and the front side of the main body.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bag according to the present invention; FIG.
(11) is a pair of opposing main bodies made of cloth, synthetic leather, vinyl, nylon, and other various flexible fabric materials, and the opening / closing rim of the bag (B). The edges other than the (upper edge) are all bent to the rear side in substantially L-shape as bent pieces (11a).

Further, (12) is a gusset made of the same or different flexible cloth material as the main body (11), and a reinforcing core (13) is attached to the backing state. The reinforcing core (13) is made of a material having a shape-retaining strength such as a cardboard or a synthetic resin plate.
Since it is fixed and integrated with 2), it is not always necessary to affix to the gusset (12) in advance with an adhesive or the like.
You may just join it.

The edge of the gusset (12) corresponding to the edge of the main body (11) is folded back in a substantially U-shape as a folded piece (12a). (13) surrounds the edge.

Then, the tip of the folded piece (12a) of the gusset (12) and the folded piece (11a) of the main body (11) are sewn together by a first stitch (14) penetrating the two layers. It is. that time,
The seam allowance (L1) of the first stitch (14) is
It is set narrow so as not to interfere with 3), and is not exposed from either the main body (11) or the gusset (12).

Further, a second stitch (15) penetrating through a total of three layers including the reinforcing core (13) wrapped thereby is provided in the bending part of the folded piece (12a) of the gusset (12). It is sewn substantially parallel to the first stitch (14).

That is, as is apparent from FIG.
The second stitch (1) for the folded piece (12a) of (2)
The seam allowance (L2) of the fifth stitch (L2) is set wider than the seam allowance (L1) of the first stitch (14). ) Is sewn in a penetrating state only on the folded piece (12a) of the gusset (12). The main body (1
It is not stitched with the bent piece (11a) of 1).

As a result, one end (15r) of the penetrating second stitch (15) is exposed from the front side of the gusset (12), and the other end (15f) is also exposed from the front side of the main body (11). And the second stitch (15)
As the edging pattern of the bag (B),
It can give an elegant decoration effect.

The bag (B) having the above-mentioned structure has a flat bed (16) as shown in FIGS.
Anyone can easily sew as follows using the general-purpose sewing machine (18) provided with (7). (1
9) is a sewing needle of the sewing machine (18).

That is, in manufacturing the bag (B), first, as shown in FIG. 7, a main body (11) and a gusset (12) to which a reinforcing core (13) is temporarily fixed in advance on the back side. Then, the universal sewing machine (18) is stacked on the flat bed (16), and its edges are stitched together by the first stitch (14).

The first stitch (14) for stitching
Is to keep the seam allowance (L1) of the bent piece (11a) of the main body (11) as small as possible and to penetrate the successive turned tip of the turned piece (12a) of the gusset (12). Next, position.

Next, the above gusset (12) is removed from FIG.
As described above, the main body (11) sewn to the folded front end portion is folded in the same direction in which the reinforcing core (13) is present, while being folded in the wrapping direction of the reinforcing core (13). 11) bent piece (11)
a) and the folded piece (12a) of the gusset (12) are kept in a staircase in a vertical positional relationship in which the latter is wider.

Then, the main body (11) located on the upper stage thereof
Is pressed down from above by the single-blade type fabric presser foot (17) of the general-purpose sewing machine (18), while the lower gusset (12) is positioned.
As a wide seam allowance (L2) through which the reinforcing core (13) wrapped around the folded piece (12a) of the
The stitch (15) is sewn.

Then, the main body (11) and the gusset (12)
As a result, a bag (B) sewn as shown in FIG. 4 is obtained.
a) of one end (15) of the second stitch (15)
r) is not only exposed from the front side of the gusset (12), but also the other end (15f) is exposed from the front side of the main body (11). It is finished in an elegant bag (B),
Moreover, the bag (B) is given the shape-retaining strength by the reinforcing core (13).

9 to 11 show the main body (11) and the gusset (1).
According to a modified embodiment in which the arrangement of 2) is different from the above-described basic embodiment, it goes without saying that the manufacturing method of the present invention can be applied to the bag (B) having such a configuration. Other configurations in the modified embodiment are as follows.
Since it is substantially the same as the above basic embodiment, FIG.
Only enter the corresponding symbols in FIGS.
A detailed description thereof will be omitted.

[0022]

As described above, in the method for manufacturing a bag according to the present invention, the edge of the main body (11) and the gusset (12) provided with the reinforcing core (13) in a backing state correspond to the positions. With the edge, as the vertical positional relationship where the latter is stacked on the former,
Stitching is performed by the first stitch (14), then the gusset (12) is folded back in the direction in which the reinforcing core (13) is wrapped, and the main body (11) sewn to the tip of the folded piece (12a) is further sewn. Reinforcement core (13)
Of the main body (11) and the folded piece (12a) of the gusset (12) are maintained in a staircase in a vertical positional relationship in which the latter has a wider width. Then, while pressing down the main body (11) located at the upper stage from above, the reinforcing core (13) wrapped around the folded portion (12a) of the gusset (12) located at the lower stage also penetrates. By sewing a second stitch (15) to the
Since both ends (15r) and (15f) of the stitch (15) are exposed from the front side of the gusset (12) and the front side of the main body (11), the problems of the prior art described with reference to FIGS. There is an effect that can be completely improved.

That is, according to the manufacturing method of the present invention, it is not necessary to use a conventional and expensive post sewing machine (5) for three-dimensional sewing, and a flat bed (16) as shown in FIGS.
Using a common general-purpose sewing machine (18) having a single-blade type fabric presser (17), the reinforcing core (13) is wrapped around the reinforcing core (13) and has high shape-retaining strength, and the front side of the gusset (12) and the main body (11). ), Anyone can easily produce an elegant bag (B) with the second stitch (15) exposed from the front side as a border pattern.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a basic embodiment of a bag according to the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is an enlarged side sectional view showing a sewn portion of the bag according to the present invention.

FIG. 5 is a perspective view of a sewing machine used for sewing the bag.

FIG. 6 is an oblique view showing the fabric presser foot of FIG. 5 extracted.

FIG. 7 is a partially enlarged cross-sectional view showing a stitching step by a first stitch of the bag.

FIG. 8 is a partially enlarged cross-sectional view showing a second stitch sewing step subsequent to FIG. 7;

FIG. 9 shows a modified embodiment of the bag according to the present invention.
FIG.

FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 9;

FIG. 11 is a sectional view taken along line 11-11 of FIG. 10;

FIG. 12 is an enlarged side sectional view showing a sewing portion of a conventional bag.

FIG. 13 is a perspective view showing a conventional bag sewing special sewing machine.

FIG. 14 is an oblique view of the fabric presser foot of FIG. 13 extracted and shown.

FIG. 15 is a partially enlarged sectional view showing a conventional bag sewing process.

[Explanation of symbols]

 (11) ・ Main body (11a) ・ Bending piece (12) ・ Machi (12a) ・ Folding piece (13) ・ Reinforcing core (14) ・ First stitch (15) ・ Second stitch (15r) ・ One end (15f) )-Other end (B)-Bag (L1)-Seam allowance (L2)-Seam allowance

Claims (1)

(57) [Claims] 1. An edge of a body (11) and a reinforcing core (13).
Are sewn by a first stitch (14) with the corresponding edge of the gusset (12) attached to the backing state in a vertical positional relationship in which the latter is stacked on the former, and then the gusset (12) is The reinforcing core (13) is folded in the wrapping direction and the folded piece (12a)
Is further folded in the same direction where the reinforcing core (13) is present, so that the folded piece (11a) of the body (11) and the folded piece (12) of the gusset (12) are folded. 12a), and the latter is kept in a staircase in a vertical positional relationship in which the latter is wider, and while the main body (11) located on the upper stage is pressed down from above, the gusset (12) located on the lower stage is folded back A piece (12a) is wrapped around the reinforcing core (1
3) By sewing the second stitch (15) so as to penetrate, both ends (15r) and (15f) of the penetrated second stitch (15) are connected to the front side of the gusset (12) and the main body (11). A method for producing a bag, characterized in that the bag is exposed from the front side.