JPH07125594A - Manufacture of air bag for vehicle - Google Patents

Abstract

PURPOSE:To improve the extent of productivity by cutting a nearly rectangular air bag fabric so as to make the longitudinal direction of this fabric set a specified angle to the weaving yarn of a material roll, while folding double this cut fabric with the latitudinal direction as the return line, and sewing respective superposed fellow sides together. CONSTITUTION:Using a material roll 1 consisting of a longitudinal strip fabric of plain weave extending in a direction of length or width weaving yarn 1a, a nearly rectangualr air bag fabric 2 is cut so as to make a center line 3 in the longitudinal direction of this fabric 2 become an angle alpha of about 22.5 deg. or so to a direction 4 of the weaving yarn 1a of the material roll 1. In addition, this cut fabric 2 is folded double with the latitudinal direction as the return line 5, then respective superposed sides are sewn in U-shaped form. This sewing operation is carried out for only three sides as compared with the conventional method that the whole circumference of two sheets of cloth must be sewn, so that productivity in the air bag is well improvable.

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 an air bag body of a vehicle air bag device.

[0002]

2. Description of the Related Art An airbag device is a safety device that protects an occupant by inflating the airbag instantaneously as an aid to a seat belt when a vehicle has a frontal collision and the impact is more than a predetermined value. An inflator which is a gas generator, and an airbag which is inflated by the gas of the inflator,
The air bag is configured to enclose the inflator together with the air bag in a substantially airtight manner. And
Upon operation of the airbag device, the gas instantly ejected from the inflator fills the airbag case and the airbag to generate an internal pressure, and the internal pressure causes the bag to deploy.

[0003]

By the way, in the air bag of such an air bag device, two air bag cloths having substantially the same shape are cut from a raw material such as a plain weave, and these cloths are overlapped to each other. The airbag body is manufactured by stitching the peripheral portions together, but since the two cloths have to be cut and the outer circumferences of these cloths have to be sewn, the manufacture is made. Man-hours increase.

Therefore, Japanese Utility Model Laid-Open No. 1-58348 proposes an airbag in which a rectangular airbag cloth for two squares is folded in two and stitched on the three sides that have been overlapped. There is room for improvement in the method of cutting from the original fabric.

The present invention addresses the above-mentioned actual situation, and
By finding a new method for cutting an airbag made of a piece of cloth from a fabric, it is intended to cross the weaving threads of the sewn portion of the cloth in the airbag which simplifies the sewing. is there.

[0006]

That is, in the method of manufacturing an airbag of the present invention which meets the above-mentioned object, a substantially rectangular cloth for an airbag is prepared in which the longitudinal direction of the cloth is in the direction of the original yarn. It is characterized in that it is cut at an angle of about 20 to 25 °, and the cut cloth is folded in two with the short side direction being a folding line, and the overlapped sides are sewn together.

[0007]

According to the above-described manufacturing method of the present invention, the fabric yarn is cut so that the longitudinal direction of the airbag fabric forms an angle of about 20 to 25 °. When folded and polymerized in two, the upper and lower overlapping fabrics are in a state in which the weaving yarns are crossed in the range of about 40 to 50 °.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 relate to a method of manufacturing an airbag according to an embodiment of the present invention. FIG. 1 is a plan view showing a state in which an airbag cloth is cut from a raw fabric, and FIG. 2 is sewn after cutting a base cloth. It is a top view showing a state.

In the figure, reference numeral 1 denotes a raw fabric, which is made of a plain-woven long strip-shaped cloth extending in the direction of the longitudinal or transverse weaving yarn 1a. In the embodiment of the present invention, a substantially rectangular air bag cloth 2 as shown in the figure has a longitudinal center line 3 of about 22.5 ° with respect to the direction 4 of the weaving yarn 1a of the material 1.
As shown in FIG. 2, the front and rear angles α are cut, and the cut cloth 2 is folded in two with the short side direction as a folding line 5, and the overlapped sides are set as shown in FIG. Sew in a U shape.

As described above, in the method for manufacturing an airbag of the present invention, the weaving yarn 1a of the original fabric 1 is cut so that the longitudinal direction of the airbag fabric 2 is within a range of about 20 to 25 ° When this cloth 2 is folded in two as shown in FIG. 2, the overlapping upper cloth 6 and lower cloth 7 are overlapped with each other at an angle β (about 45 ° in the figure) of about 40 to 50 ° as shown in the drawing. , 1a 'are crossed.

Further, the sewing 8 can improve the productivity of the airbag because it requires sewing on only three sides as compared with the conventional one in which the entire circumference of two cloths is sewn.

Then, the angled cutting of the present invention is performed by arranging a plurality of cloths 2 in parallel so that the center lines 3 are parallel to each other as shown in FIG. appear.

[0014]

As described above, according to the present invention, a substantially rectangular airbag cloth is cut so that the longitudinal direction of the cloth makes a predetermined angle with respect to the original yarn, and the cut cloth is cut. The short-side direction is folded back in two, and the overlapped sides are sewn together, and the weaving yarns of the sewn portion can intersect. Further, the above-mentioned sewing also has an effect that the productivity of the airbag can be improved by simplifying the sewing as compared with the conventional sewing of two cloths.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which an airbag cloth according to an embodiment of the present invention is cut from an original fabric.

FIG. 2 is a plan view showing a state in which an airbag cloth of the same method is cut and sewn.

FIG. 3 is a perspective view showing an example of continuous cutting of an airbag cloth from the original fabric of the same method.

[Explanation of symbols]

 1 Fabric 1a Weaving thread 1a 'Weaving thread 2 Airbag cloth 3 Centerline of cloth 4 Direction of weaving thread 5 Short-side folding line 6 Upper cloth 7 Lower cloth 8 Sewing

Claims (1)

[Claims] 1. A roughly rectangular airbag fabric, wherein the longitudinal direction of the fabric is about 20 to 25 with respect to the direction of the original yarn.
Cut it at an angle so that it becomes °, and fold this cut cloth in two with the short direction as the folding line,
A method for manufacturing an airbag for a vehicle, which comprises stitching the overlapped sides together.