JP2673400B2 - Manufacturing method of passenger airbag - Google Patents

Abstract

PURPOSE:To automate the manufacture of an air bag by means of sewing operation and thereby promote a reduction in cost by constituting the bag with one-piece ground fabric cut into a specified form, while making the sewing operation at each part perfromable rectilinearly and flatly, at the time of manufacturing the air bag for a front passenger's seat. CONSTITUTION:A top face part ground fabric 3 and a bottom face ground fabric 4 with each of mouth part ground fabrics 2, 2 at each tip are solidly extended each out of both vertical ends of a bottom part ground fabric 1 receiving a rider at the time of unfurling as the ground fabric of an air bag. Using one-piece cloth having each side face part ground fabric 5 constituting a half of the side face part of a quadrangular pyramid each extended solidly from each double side edge part of these top and bottom surface ground fabrics 3 and 4, the air bag is manufactured by bending and sewing this ground fabric by means of a specified method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device which is mounted on a vehicle and automatically inflates in the event of a vehicle collision to protect an occupant. More specifically, the invention relates to an airbag bag for a passenger airbag device. The present invention relates to a method for manufacturing a body.

[0002]

2. Description of the Related Art An airbag device is used when a vehicle collides.
A safety device for inflating a bag instantaneously as an assistance of a seat belt when an impact is equal to or more than a predetermined amount and protecting an occupant, usually an inflator which is a gas generator, a bag which is inflated by gas of an inflator, And an airbag case which substantially surrounds and stores the airbag together with the bag. When the airbag device is operated, the gas ejected from the inflator due to an electric signal fills the airbag case and the airbag to generate an internal pressure, and the internal pressure causes the bag to be instantly deployed.

By the way, the airbag device is not limited to the one for the driver's seat, but in recent years, one for the passenger seat has been developed. A bag as shown in FIG. 8 has been conventionally used as an airbag bag body of the passenger side airbag device. The bag includes a body cloth (16) sewn in a cylindrical shape and the body cloth (1).
6) side surface cloths (12) sewn on both side surfaces of the cylindrical body cloth (16), and a rectangular opening (13) is provided in a part of the peripheral surface of the cylindrical body cloth (16) to form a gas for the inflator. It is an inflow port. And this opening (13)
The retainer mounting portions (14) and (15), which are different from the main body cloth (16), are formed into a bag shape so that the main body cloth (1
6) sewn onto the retainer mounting portion (14),
(15) is attached to the airbag case via a retainer (not shown) inserted therein.

[0004]

However, in the above-mentioned conventional airbag, since the bag is formed by stitching the main body cloth, the side cloth, and the cloths constituting the mounting portion as described above, the respective parts are sewn. The sewing, especially the side edge of the main body cloth and the outer peripheral edge of the side surface cloth, requires a large number of man-hours because the sewing must be performed in a curved and three-dimensional manner. Was becoming.
In addition, Japanese Patent Publication No. 52-4371 discloses an air bag formed of a single piece of base cloth. However, even in such an air bag, the base cloth is not appropriately cut. However, an extra part remains after sewing, and this remaining part makes the airbag heavy and gives an excessive impact to the occupant at the time of deployment, and the remaining part also obstructs the automation of sewing by the machine. I have a problem.

The present invention copes with the actual situation as described above, and by making a new cut on a single piece of airbag base fabric, it is possible to perform straight and planar sewing, thereby forming an airbag bag body. The purpose of this is to perform automatic sewing by a machine.

[0006]

However, the feature of the method for manufacturing a passenger airbag according to the present invention, which meets the above-mentioned object, is that the bottom surface portion for receiving the occupant from the mouth portion fixed to the opening portion of the airbag case. In a method of manufacturing a substantially truncated quadrangular pyramid-shaped air bag that spreads in a taper shape, as shown in FIG. 1, as a base fabric of an airbag, upper and lower end portions of a bottom face base fabric (1) constituting the bottom face portion From which the base cloth (3) for the upper surface and the base cloth (4) for the lower surface, each of which has the base cloth (2) for the mouth portion and the base cloth (4) for the lower portion, respectively, are integrally extended. (3) and the side surface base cloth (5) ... (5), which form the side surface of the quadrangular pyramid, are integrally extended from both side edges of the base cloth (4) for the lower surface. Using a piece of cloth, as shown in FIG. 3, fold the above base cloth in two and form a top surface base cloth (3) Opposing edges (5a) ... (5a) of the side surface base cloths (5) ... (5), which are overlapped with the lower surface base cloth (4) and extend from the upper and lower surface base cloths. And the step of sewing the base cloth folded in two into a pyramid shape as shown in FIG. 4 to form both side edges (1a), (1a) of the base cloth for the bottom surface (1a) and the side surface. Base cloth (5) ...
(5) The step of sewing the base end side edge portions (5b) ... (5b) is performed, and then the base cloth is turned over to form the airbag bag. In the manufacturing method of the present invention, as shown in FIG. 5, the sewn portions of the base cloth (1) for the bottom surface and the base cloth (5) for side surfaces (5) are replaced with the base cloth for the bottom surface (1). ) Is superposed on the bottom surface base cloth (1) at each corner portion, and is sewn together with the upper surface base cloth (3) or the lower surface base cloth (4) adjacent to the back side in a diagonal shape of each corner portion. It is also preferable to improve the airtightness of the corner portion and to secure the expanded shape of the air bag. Further, in each of the above manufacturing methods, as shown in FIG. 3, the base fabrics (2) and (2) for the mouth portion are respectively folded and sewn to the base end side to form a bag shape, and the retainer mounting portion. It is also preferable to provide.

[0007]

By carrying out the above-described manufacturing method of the present invention, a passenger seat airbag having a substantially pyramidal shape can be formed of a single piece of base cloth, and linear and planar sewing can be performed. It becomes possible to perform the sewing, and the airbag bag can be manufactured by automatic sewing by a machine.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of an airbag base fabric used in a manufacturing method of an embodiment of the present invention, and FIGS. 2 to 6 are explanatory views showing an airbag production method using the same base fabric. The airbag after sewing is shown. As shown in FIG. 6, a substantially truncated quadrangular pyramid that spreads in a taper shape from a mouth portion (A ₂ ) fixed to an opening portion of an airbag case (not shown) to a bottom surface portion (A ₁ ) that receives an occupant. It is for passenger seats that have a shape.

On the other hand, the air bag base fabric is, as shown in FIG. 1, the bottom portion base fabric for the bottom portion constituting the (A ₁₎ (1)
Trapezoidal upper surface base cloth (3) having rectangular mouth base cloths (2) and (2) respectively at the tips from the upper and lower ends
In addition, the base cloth (4) for the lower surface part is integrally extended, and the side base parts (3) of the upper surface part and the base cloth (4) for the lower surface part of the side surface part of the quadrangular pyramid are respectively separated. It is made of a single piece of cloth in which the triangular side surface base cloths (5) ... (5) forming one half are integrally extended. The base cloth has a seam allowance separately from the drawing. Further, the side cloth (5) has a size such that the other side opposite to the side cloth covers the side surface.
The other one may be as large as the seam allowance.

On the other hand, in the method of manufacturing an airbag according to the embodiment of the present invention, first, as a first step, the base cloth is folded in two along the folding line (6) shown in FIG. The base fabric (3) for lower surface part and the base fabric (4) for lower surface part are polymerized, and as shown in FIG. 3, the base fabric for side surface parts (5) ... (5) extended from the base fabric for upper and lower surface parts. ) Opposite edge (5
a) ... (5a) are sewn to each other, and the base fabrics (2) and (2) for the mouth portions are respectively sewn to the base end side by fold back lines (7) shown in FIG. The retainer mounting portions (8) and (8) are formed by forming the retainer into a bag shape.

Next, as shown in FIG. 4, in a second step, the two-folded base cloth is raised in the shape of a pyramid, and both side edge portions (1a), (1a) of the bottom surface base cloth (1). And the base end edge portion (5b) of the side surface base cloth (5) (5) (5)
b) Sew and. Then, as a third step, as shown in FIG. 5, the bottom portion base cloth (1) and the side surface base cloth (5) ... Is superposed on the bottom surface base cloth (1) at the four corners of
Moreover, by diagonally sewing (H) together with the upper surface base cloth (3) or the lower surface base cloth (4) adjacent to the back side, the corner airtightness as shown in FIG. 6 is obtained. The air bag is formed so as to improve the property and secure the shape of the air bag, and then this is turned over and the process ends.

As described above, according to the method of manufacturing an airbag of the present invention, the passenger seat airbag having a substantially pyramidal shape is constituted by a single piece of base cloth cut into a predetermined shape, and each portion is sewn. By making the airbag straight and flat, all the airbag manufacturing by sewing as described above can be performed by a machine, and the number of man-hours is significantly reduced as compared with the conventional one, and the cost of the passenger airbag is reduced. It has a great effect that it can be mass-produced at low cost and can be mass-produced.
Further, in the method of manufacturing the airbag of the present invention, since the sewing is performed in a plane as described above, the positioning pins (9) ... (9) and the through holes (10) for sewing, as shown in FIG.
(10) Using a pair of upper and lower sewing jigs, a flap with holes (11) ... (1) from the outer edge of the stitched portion of the base cloth.
1) Extend and use it for positioning pins (9) ... (9)
It is possible to perform the automatic sewing by inserting the base cloth into the base material and inserting the base cloth with this jig to further facilitate the positioning of the base cloth during superposition.

[0013]

As described above, according to the method of manufacturing an airbag for a passenger seat of the present invention, as the base fabric for an airbag, the base fabric for the bottom portion that receives an occupant at the time of deployment is attached to the tip from the upper and lower ends, respectively. The base cloth for the upper surface and the base cloth for the lower surface, each of which has the base cloth for the mouth portion, are integrally extended, and the square pyramid is respectively provided from both side edges of the base cloth for the upper surface and the base cloth for the lower surface. Using a single piece of fabric in which the side face base fabric that constitutes the side face part is integrally extended, the airbag is manufactured by bending and stitching this base fabric by a predetermined method. By constructing a passenger seat airbag having a substantially pyramidal shape with a single piece of base fabric cut as described above, and by sewing each part linearly and in a plane,
All of the manufacturing of airbags by sewing is automated by a machine, and the number of man-hours is significantly reduced compared to the past, which significantly reduces the manufacturing cost of passenger airbags and is suitable for mass production. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a plan view of an airbag base fabric used in a manufacturing method according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a first step of an example manufacturing method using the same base cloth.

FIG. 3 is an explanatory diagram showing the first step.

FIG. 4 is an explanatory diagram showing the second step.

FIG. 5 is an explanatory diagram showing the third step.

FIG. 6 is a perspective view showing the airbag after the completion of the third step.

FIG. 7 is an explanatory diagram showing a sewing example of the manufacturing method of the present invention using a sewing jig.

FIG. 8 is a perspective view showing an example of a conventional passenger airbag.

[Explanation of symbols]

 (1) Base fabric for bottom part (2) Base fabric for mouth part (3) Base fabric for top part (4) Base fabric for bottom part (5) Base fabric for side part (6) (7) Folding line (8) ) Retainer mounting part (1a) Side edge of base cloth for bottom surface (5a) Opposing edge of base cloth for side surface (5b) Base end side edge of base cloth for side surface

Front Page Continuation (72) Inventor Takeshi Yamaji, Miyoshi-cho, Nishikamo-gun, Aichi Oita, No. 3 Igayama, Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (72) Inventor Motoaki Naruse, Miyoshi-cho, Nishikamo-gun, Aichi Uchikoshi character Igayama No. 3 Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (3)

(57) [Claims] 1. A method for manufacturing a substantially truncated quadrangular pyramid-shaped airbag that spreads in a taper shape from a mouth fixed to an opening of an airbag case to a bottom surface for receiving an occupant, the method comprising: Base cloth (3) for upper surface part and base material for lower surface part having base cloths (2), (2) for mouth parts respectively at the tips from the upper and lower ends of the base cloth (1) for bottom parts constituting the bottom part For the side surface part of which the cloth (4) is integrally extended, and the side surface parts of the quadrangular pyramid are respectively formed from the respective side edges of the upper surface part base material (3) and the lower surface part base cloth (4). The base cloth (5) ... (5) is made of a single piece of cloth, and the base cloth is folded in two to form a base cloth (3) for the upper surface and a base cloth (4) for the lower surface. And the opposite edge portions (5a) ... (5a) of the side face base fabrics (5) ... (5) extending from the upper and lower face base fabrics. The step of sewing a sword and raising the two-folded base cloth into a pyramid shape, and forming both side edges (1a) and (1a) of the bottom surface base cloth (1) and the side surface base cloth (5). ... (5) Base end side edge (5b) ... (5b) is sewn, and then the base cloth is turned over to form an airbag bag body. Air bag manufacturing method. 2. The bottom part base cloth (1) and the side part base cloth (5) ... (5) are sewn together at the respective corners of the bottom part base cloth (1). The base fabric (1) is superposed and is sewn diagonally to each corner together with the base fabric (3) for the upper surface or the base fabric (4) for the lower surface adjacent to the back side. A method for manufacturing the passenger airbag as described. 3. The airbag for a passenger seat according to claim 1 or 2, wherein the base fabrics (2), (2) for the mouth portion are folded back and sewn to the base end side to form a bag shape. Production method.