JPH11216A - Manufacture of bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture an elegant bag without exposing stitches from both front and back surfaces. SOLUTION: The end edge parts of both main bodies 11 are piled up on both end edge parts of a front gore 12 and sewn together by a first stitch. Then, one end edge part of both back gores 14 is piled up on the end edge part of both main bodies 11 and the total of three layers including the front gore 12 as well are sewn together by a second stitch. Thereafter, the whole body is temporarily turned over from both end edge parts, the front gore 12 and both back gores 14 in the turned-over state are successively separated in opposite directions, the other end edge parts of both back gores 14 are sewn by a third stitch 16, both main bodies 11 are turned right side up and thus, the first and second stitches are hidden invisibly from both front and back sides.

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 more particularly, to a method for easily manufacturing an elegant bag with no exposed stitches using a general-purpose sewing machine.

[0002]

2. Description of the Related Art As a bag for carrying a woman or a shoulder bag, as shown in FIG. 17, an approximately 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, in the bag of the above embodiment, one end (3f) of a stitch (3) for sewing the folded piece (1a) of the main body (1) and the folded polymer piece (2a) of the gusset (2) is sewn. ) Is exposed to the front side along the edge of the gusset (2), which is incompatible with the design specification of the bag, and restricts the design freedom.

Furthermore, it is impossible to make the bag see-through by using a material such as transparent vinyl for the main body (1). This is because the other end (3r) of the stitch (3) is exposed to the back side along the edge of the main body (1), which is extremely unsightly.

In the bag of the above-described embodiment, a special sewing machine for three-dimensionally sewn goods (FIG. 18-20) is provided with a tall post-type bed (4) and a bifurcated fork type fabric presser foot (5). As shown in FIG. 20, a folded piece (1a) of the main body (1) and a folded polymer piece of a gusset (2) are spread on the post-type bed (4) by using a post sewing machine (6) as shown in FIG. (2a) and the dough foot (5), if it is not stably pressed by the serrated rough surface (5a),
The sewing operation cannot be performed correctly and efficiently. That is, the special and expensive post sewing machine (6) is indispensable. (7) shows the sewing needle of the post sewing machine (6).

[0006] In particular, when a bag having high shape-retaining strength is obtained by inserting a reinforcing core into the gusset (2) while adopting a soft or thin cloth material, the above-mentioned stitching operation is increasingly 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.

[0007]

SUMMARY OF THE INVENTION The present invention intends to drastically solve such a problem. As a method of manufacturing a bag useful for this purpose, the present invention is directed to a method of manufacturing a bag with a predetermined band width at both ends of a front gusset. The corresponding edges of a pair of opposite main bodies are stacked, and the two layers are sewn together by a first stitch, and then one end edge of a pair of opposite back gushes narrower than the front gusset to the edges of both main bodies. Stack the parts,
A total of three layers including the front gusset are stitched together by the second stitch substantially parallel to the first stitch,

[0008] Thereafter, the pair of main body and back gusset facing the sewn front gusset are once turned upside down from both end edges, and the front gusset and both back gussets in the inverted state are replaced with each other. By continuing to separate in the opposite direction, the entire body including both the main body is folded and flattened, and the other end edges of both back gussets are bent and raised and joined as a piece, and then the bent and raised pieces are joined together. 3 stitches are sewn, and finally, the first and second stitches are invisible from both front and back sides by bending and raising both main bodies so that the front gusset and both back gussets face up and down. It is characterized in that it is concealed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIGS. 1 to 10 show a basic embodiment of a bag (B) aimed at, and (11) is preferably transparent. Or, a pair of opposed main bodies made of translucent vinyl, nylon, or other various fabric materials, and the edges except for the edge (upper edge) for taking in and out of the article,
The entire piece is bent in a substantially L-shape to the rear side as a bent piece (11a).

Reference numeral (12) denotes a front gusset having a predetermined band width (W1) which covers a space between the two main bodies (11) facing each other, and is made of non-transparent cloth, synthetic leather, vinyl, and other various fabric materials. Both ends are folded in a substantially U-shape to the back side of the main body (11) in contact with the folded piece (11a) as a pair of folded pieces (12a).

Then, both folded pieces (12a) of the front gusset (12) and folded pieces (11a) of both body (11).
Are sewn together by the first stitch (13). (L1) indicates a seam allowance for the first stitch (13).

Further, (14) is a pair of opposite back gussets made of the same or different non-transparent cloth material as the front gusset (12), and the band width (W2) of each of the back gussets is (1).
The width is reduced to about half of the band width (W1) in 2). Moreover, one end edge of each of the back gussets (14) is folded back as a folded piece (14a) in a substantially U-shape to the back side in contact with the folded piece (11a) of the main body (11).

That is, the bent pieces (11a) of the main bodies (11) are both turned pieces (12a) of the front gusset (12).
And the folded pieces (14a) of both back gussets (14)
It is sandwiched from both sides, and a total of three layers are sewn via a second stitch (15) substantially parallel to the first stitch (13).

Therefore, the first and second stitches (13) (1)
5) results in that the bag (B) is kept invisible from not only the front side but also the back side. Even if a transparent material is used for the two main bodies (11), an elegant design specification in which the first and second stitches (13) and (15) do not appear at all can be obtained. (L2) indicates a seam allowance for the second stitch (15).

On the other hand, the other end edges of both back gussets (14) are bent at approximately right angles (14b) to form the front gussets (1).
The bonding state on the line (OO) that bisects the band width (W1) of (2) is maintained, and the first and second stitches (13) (1)
The third stitch (16) which is substantially perpendicular to 5) is sewn and integrated with each other. Therefore, a space (S) in the shape of a closed bag is defined between the facing gussets (12) and the back gussets (14) facing each other.

(17) is a reinforcing core inserted into the space (S) prior to the sewing and integration of the both back gussets (14) by the third stitch (16), and has flexibility. It is made of cardboard, synthetic resin plate, and other various materials with high shape retention strength.

In this case, in the illustrated embodiment, the reinforcing core (1
7) is inserted into the space (S) so as to be wrapped by the folded parts (12a) of the front gusset (12), and the bent parts (14) of the two back gussets (14) are bent.
b) Comrades are sewn and sealed.
A reinforcing core (17) may be attached to the back side of (2) in a temporarily fixed state, and then the bent and raised pieces (14b) of both back gussets (14) may be finally sewn and integrated.

Further, in the illustrated embodiment, both main bodies (11) are provided.
The seam allowance (L2) of the second stitch (15) for sewing a total of three layers of the bent piece (11a), the folded pieces (12a) of the front gusset (12), and the folded pieces (14a) of the both gussets (14). ) Is replaced with both folded pieces (12a) of the front gusset (12) and the folded pieces (11) of both body (11).
By setting the seam allowance (L1) of the first stitch (13) to sew the two layers of (a) and (b) wider, the folded pieces (14a) of the two back gussets (14) can be connected to both the main body (1).
Although it prevents floating from the bent piece (11a) of 1), the seam allowance (L2) of the second stitch (15) is made smaller than that of the first stitch (13). I can't tell.

The bag (B) having the above structure can be used by a general-purpose sewing machine (19) having a common flat bed (18) as shown in FIG. Sewing work can be easily performed as follows. (20) shows a sewing needle of the sewing machine (19).

That is, in manufacturing the bag (B), first, as shown in FIG. 5, a pair of main bodies (1) opposed to both ends of a front gusset (12) having a predetermined band width (W1) are provided.
The corresponding edges in 1) are stacked and the two layers are stitched together by a first stitch (13). In that case, it is preferable that the seam allowance (L1) of the first stitch (13) is determined to be as narrow as possible.

Next, as shown in FIG. 6, one end edge of a pair of opposite back gussets (14) narrower than the front gusset (12) is stacked on the edges of the two main bodies (11). A total of three layers including the front gusset (12) are sewn together by the second stitch (15) substantially parallel to the first stitch (13) under the wide seam allowance (L2).

Then, the stitched front gusset (1
The pair of main bodies (11) and back gussets (14) facing 2) are once again turned upside down in the direction indicated by the arrow (X) in FIG.

Then, as is apparent from the inverted state of FIG. 7, the edge portions of both the main bodies (11) are bent (11).
a), and both end edges of the front gusset (12) sandwiching this are turned back pieces (12a), and one end edges of both back gussets (14) are turned back pieces (14a). By doing so, the first and second stitches (1
3) As a result, (15) is concealed invisibly from both sides of the bag (B).

Thereafter, the front gusset (12) and the two back gussets (14) in the inverted state in FIG. 7 are separated in the opposite direction indicated by the arrow (Y) in FIG. 7 to include both the main body (11). The whole is folded and flattened as shown in FIG.
The other end edges of both back gussets (14) are bent and raised to form
4b), and the bent joint pieces (14)
b) The comrades are sewn and integrated by the third stitch (16).

By the sewing of the third stitch (16), a reinforcing core is provided before the space between the front gusset (12) and both back gussets (14) is sealed as a closed bag-shaped space (S). (17) is inserted as shown in FIGS.

Finally, after the sealing of the reinforcing core (17) is completed, the main body (11) is bent and raised from the folded flat state in FIG. 8 to the three-dimensional state in FIG. The front gusset (12) and the two back gussets (14) are maintained so that the bag (B) has the normal front and back faces.

Then, the first and second stitches (13) and (15) can be confirmed from the overall views of FIGS.
However, it is possible to obtain an elegant see-through bag (B) that is concealed not only from the front side but also invisible from the back side and has a high shape-retaining strength in which the reinforcing core (17) is enclosed.

In the basic embodiment shown in FIGS. 1 to 10, the bent-up pieces (14 b) of both back gussets (14) are connected to the front gusset (1).
The band width (W1) in (2) is joined on the bisector (OO) of the band width (W1) and sewn and integrated by the third stitch (16). W
As shown in the first modified embodiment of FIG. 11, the bending piece (14 b) is located at a position eccentric to one of the bisectors (OO) as shown in the first modified embodiment of FIG. 11. ) Even if the comrades are sewn together, it can only be said.

In the basic embodiment, the front gusset (1
A reinforcing core (17) is sealed in a space (S) defined between the back gusset (2) and the back gusset (14), but the installation of the reinforcing core (17) is omitted in FIG. It is also possible to finish as a bag (B) as shown in the second modified embodiment.

Further, in the basic embodiment, the front gusset (1
After the reinforcing core (17) is inserted into the space (S) defined between the back gusset (2) and the back gusset (14), the bent back pieces (14b) of the back gusset (14) are connected to each other. Are sewn and sealed by a third stitch (16).
As shown in the third modified embodiment of FIG. 6, a reinforcing core (17) is attached to the back side of the front gusset (12) in a temporarily fixed state from the beginning, and then a pair of main bodies ( 11) and the back gusset (14) are turned upside down, so that the reinforcing core (17) is turned upside down (12).
And the back gussets (14) are wrapped between them, and finally the bent and raised pieces (14b) of the back gussets (14) are put together by the third stitch (16) to enclose the reinforcing core (17). It may be sewn and integrated.

Since the other configurations and the manufacturing method in the first to third modified embodiments are substantially the same as those in the above-described basic embodiment, the corresponding reference numerals in FIGS. Just fill it in and omit the detailed explanation.

[0032]

As described above, in the method for manufacturing a bag according to the present invention, the pair of main bodies (11) opposed to both end portions of the front gusset (12) having the predetermined band width (W1). And the two layers are stitched together by the first stitch (13), and then the two bodies (11)
One end edge of a pair of opposite back gussets (14) narrower than the front gusset (12) is stacked on the edge of
A total of three layers including the front gusset (12) are sewn together by a second stitch (15) substantially parallel to the first stitch (13),

Then, the sewn front gusset (1
A pair of the main body (11) and the back gusset (14) facing each other are turned over once from both end edges to the inverted state, and the front gusset (12) and both back gussets (14) in the inverted state are turned over. Are continuously folded away in the opposite direction (Y) to fold and flatten the entire body including both main bodies (11) and to bend and raise the other end edges of both back gussets (14) to form pieces (14b). Then, the bent pieces (14b) are sewn together by a third stitch (16), and finally, both main bodies (11) are attached to the front gusset (1).
The first and second stitches (13) and (15) are hidden from view from both front and back sides by bending and raising the back and front gussets (2) to the normal front and back sides. Thus, there is an effect that the problem of the related art described with reference to FIGS.

That is, according to the manufacturing method of the present invention, the first and second stitches (13) and (15) are concealed invisibly from both the front and back sides, so that the pair of main bodies (11) facing each other.
A general-purpose sewing machine (1) provided with a common flat bed (18)
Using 9), anyone can easily produce a very elegant see-through bag (B).

In particular, if the manufacturing methods of claims 2 and 3 are adopted, even a worker who does not have a high level of skill and abundant experience, the bag (B) having a high shape retention strength by the reinforcing core (17). Can be easily sewn, which helps to improve the mass production effect.

Furthermore, if the manufacturing method of the fourth aspect is adopted, there is a possibility that the folded pieces (14a) of the two back gussets (14) may float from the folded pieces (11a) of the both main bodies (11), and the seam allowance (L2 The second stitch (15) having a large width has the effect of reliably preventing the second stitch.

If the manufacturing method of claim 5 is adopted,
A pair of opposing main bodies (11) that can be seen through, a front gusset (12) that cannot be seen through, and a pair of opposite gussets (1).
Combination with 4) has the effect of obtaining an elegant see-through bag (B) rich in interest.

[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 a perspective view of a sewing machine used for sewing the bag according to the present invention.

FIG. 5 is a partially enlarged cross-sectional view showing a stitching step by a first stitch of the bag.

6 is a partially enlarged cross-sectional view showing a sewing step in a second stitch subsequent to FIG. 5;

FIG. 7 is a partially enlarged cross-sectional view showing an inverted state following FIG. 6;

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

FIG. 9 is a partially enlarged cross-sectional view showing the face-up finish state following FIG. 8;

FIG. 10 is a perspective view showing an insertion operation of a reinforcing core.

FIG. 11 is a sectional view corresponding to FIG. 9 and illustrating a first modified embodiment of the present invention.

FIG. 12 is a sectional view corresponding to FIG. 9 showing a second modified embodiment.

FIG. 13 is a sectional view of a sewing step corresponding to FIG. 5 and showing a third modified embodiment.

FIG. 14 is a cross-sectional view showing a sewing step in a second stitch subsequent to FIG. 13;

FIG. 15 is a cross-sectional view showing the inverted state following FIG. 14;

FIG. 16 is a cross-sectional view showing a sewing step in a third stitch subsequent to FIG. 15;

FIG. 17 is an enlarged side sectional view showing a sewing portion of a conventional bag.

FIG. 18 is a perspective view showing a conventional bag sewing special sewing machine.

FIG. 19 is a perspective view showing the dough presser of FIG. 18 extracted.

FIG. 20 is a partially enlarged sectional view showing a conventional bag sewing process.

[Explanation of symbols]

 (11) ・ Body (11a) ・ Bending piece (12) ・ Front gusset (12a) ・ Bending piece (13) ・ First stitch (14) ・ Back gusset (14a) ・ Folding piece (14b) ・ Bending piece (15) ・ Second stitch (16) ・ Third stitch (17) ・ Reinforcement core (B) ・ Bag (S) ・ Space (X) ・ Flip over direction (Y) ・ Pull direction (L1) ・ First stitch Seam allowance (L2), seam allowance for second stitch (W1), band width of front gusset (OO), bisector

Claims (5)

[Claims] 1. A front gusset (12) having a predetermined band width (W1).
The corresponding edges of a pair of opposite bodies (11) are stacked on the opposite edges, and the two layers are sewn together by the first stitch (13), and then to the edges of both bodies (11). The above table gusset (12)
One end edges of a pair of opposite gussets (14) narrower than each other are stacked, and a total of three layers including the front gusset (12) are second stitches (15) substantially parallel to the first stitches (13). Then, the pair of main body (11) and back gusset (14) facing the front gusset (12) and the back gusset (14) are once turned upside down from both end edges, and are turned to the inverted state. One front gusset (12) and both back gussets (14)
And subsequently in the opposite direction (Y),
The entire body including both the main bodies (11) is folded and flattened, and the other end portions of both back gussets (14) are bent and raised as a piece (14b) to be joined together, and then the bent and raised pieces (14b) are formed. ) Sew the competitor by the third stitch (16), and finally, bend both main bodies (11) so that their front gussets (12) and both back gussets (14) are turned upside down with proper front and back. The first and second stitches (13)
A method for producing a bag, wherein (15) is concealed so as to be invisible from both sides. 2. A bent piece (14b) of both back gussets (14).
The comrades are sewn by the third stitch (16), and before the space between the back gusset (14) and the front gusset (12) is sealed as a closed bag-shaped space (S), the space between the back gusset (14) and the front gusset (12) is sealed. 2. The method according to claim 1, wherein a reinforcing core is inserted. 3. A reinforcing core (17) is attached to the back side of the front gusset (12) in a temporarily fixed state from the beginning, and then a pair of main bodies (11) and the back gusset (14) facing the front gusset (12). The method according to claim 1, characterized in that the reinforcing core (17) is wrapped between the front gusset (12) and the two back gussets (14) by inverting the entirety of the bag. 4. The method according to claim 1, wherein the seam allowance (L2) of the second stitch (15) is set wider than the seam allowance (L1) of the first stitch (13). 5. The first and second stitches (1) and (2) are made by making the front gusset (12) and both back gussets (14) non-transparent fabric materials while using both body (11) as transparent fabric material. 1
3) The method of manufacturing a bag according to claim 1, wherein (15) is concealed so as to be invisible from both sides.