Airbag coating equipment

Abstract

To provide a coating device which can change amount of coating at both of a width direction of a base fabric and a transportation direction when coating a coating material on a base fabric of an air bag.SOLUTION: A coating device 10 comprises: a second roller 13; a first roller 14; a knife part 15 which can reserve a coating material C between the knife part and a second outer peripheral surface 13S of the second roller 13 and is divided into a plurality of parts 15a-15k in an axial direction; and a controller 16C which controls pressing force against a second outer peripheral surface 13S of each of the parts 15a-15k. After coating the coating material C on the second outer peripheral surface 13S while the second roller 13 rotates, transfer coating of the coating material C is performed on a base fabric 2 of a hollow weave air bag 1 passing through between the second roller 13 and the first roller 14 while the first roller rotates with the second roller. The pressing force of each of the parts 15a-15k is individually changed, thereby changing amount of coating of the coating material C on the second outer peripheral surface 13S in the axial direction and in the transportation direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an airbag coating apparatus. [Background technology]

[0002] Conventionally, some hollow woven airbags, such as curtain shield airbags installed in automobiles, have a coating of silicone rubber or the like applied to their surfaces to maintain airtightness when inflated and deployed. In the hollow woven airbag described in Patent Document 1, a knife is used to adjust the amount of coating applied to the base fabric, and the radius of curvature of the tip of the cross section of the knife is partially changed in the width direction, thereby varying the amount of coating in a band-like pattern across the width. Also, some airbags are formed by cutting plain woven base fabric into parts and sewing them together, and a coating of silicone rubber or the like is applied to the surface to partially increase heat resistance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-261380 Summary of the Invention [Problem to be solved by the invention]

[0004] The coating device for hollow woven airbags described in Patent Document 1 can vary the amount of resin applied in a band-like pattern across the width of the base fabric. This allows for thicker coatings at seams where airtightness is particularly important, while thin coatings are applied elsewhere, reducing the amount of resin applied. However, because the amount of resin applied cannot be varied in the conveyance direction of the base fabric, if areas requiring thick coating are separated in the conveyance direction, it is not possible to increase the amount of resin applied only to those areas. This creates a problem: it is not possible to further optimize the amount of resin applied locally and reduce the amount of resin applied. Similar problems exist with airbags formed by sewing together individual parts.

[0005] In view of these problems, an object of the present invention is to provide an airbag coating device that can change the amount of coating agent applied in two directions, the width direction and the conveying direction of the base fabric, when applying the coating agent to the base fabric of the airbag. [Means for solving the problem]

[0006] A first aspect of the present invention is an airbag coating device comprising: a first roller; a second roller arranged with its axis parallel to the first roller; a knife that is pressed radially against a second outer peripheral surface that is the outer peripheral surface of the second roller and is capable of storing a coating agent between the first roller and the second roller, the knife having an abutment portion that extends in the axial direction and is divided into multiple portions in the axial direction so that the pressing force of each portion against the second outer peripheral surface can be individually changed; and a control device that controls the pressing forces of each portion.The first roller is rotated while the second roller is rotated in the opposite direction to the first roller, and the base fabric of the airbag is passed between the first outer peripheral surface that is the outer peripheral surface of the first roller and the second outer peripheral surface, thereby transferring and conveying the coating agent applied to the second outer peripheral surface of the second roller.The amount of coating agent applied to the second outer peripheral surface can be changed in two directions, that is, the axial direction and the conveying direction, by individually changing the pressing force of each portion of the knife using the control device.

[0007] According to the first aspect of the present invention, the coating agent is applied while the pressing force of each part of the knife against the second outer peripheral surface of the second roller is individually changed by the control device, and then the coating agent applied to the second outer peripheral surface of the second roller is transferred and applied to the base fabric for conveyance. This allows the amount of coating agent applied to the base fabric to be changed in two directions, the axial direction and the conveyance direction, so that the amount of coating agent applied can be increased only in areas where a large amount is needed, thereby reducing the total amount of coating agent used.

[0008] The second invention of the present invention is characterized in that, in the above-mentioned first invention, a silicone coating is formed on the second outer peripheral surface of the second roller, and the cross section of the abutment portion of the knife taken along a plane perpendicular to the axial direction has an R-shape.

[0009] According to the second invention, the knife can be smoothly slid against the second outer peripheral surface of the second roller while the coating agent is stored between the knife and the second outer peripheral surface of the second roller, making it easy to change the amount of coating agent applied to each part of the knife.

[0010] A third aspect of the present invention is an airbag coating device comprising: a first roller; a knife that is pressed radially against a first outer surface, which is the outer surface of the first roller, and whose contact portion against the first roller extends in the axial direction and is divided into multiple parts in the axial direction so that the pressing force of each part against the first outer surface can be individually changed; and a control device that controls the pressing force of each part, wherein while the first roller is rotated and the base fabric of the airbag is conveyed between the first outer surface and the knife, a coating agent is supplied onto the base fabric on the side opposite to the conveying direction of the knife, and the pressing force of each part of the knife is individually changed by the control device, thereby changing the amount of coating agent applied to the base fabric in two directions, that is, the axial direction and the conveying direction.

[0011] According to the third aspect of the present invention, the coating agent is supplied onto the base fabric while the first roller is rotating and the base fabric is in contact with the first outer peripheral surface, and the amount of coating agent applied to the base fabric by the knife can be varied in two directions, the axial direction and the conveying direction, so that the amount of coating agent applied can be increased only in areas where a large amount is needed, thereby reducing the total amount of coating agent used.In addition, the coating device has a simple structure with few component parts.

[0012] A fourth aspect of the present invention is an airbag coating device comprising: a first roller; a knife that is pressed vertically against a base fabric of the airbag in a tensioned state as the airbag rotates, contacting a first outer peripheral surface of the first roller and being fed in a conveying direction, the knife having a contact portion against the base fabric extending parallel to the axial direction of the first roller and divided into a plurality of portions in the axial direction so that the pressing force of each portion against the base fabric can be individually changed; and a control device that controls the pressing force of each portion, wherein the first roller is rotated to press the knife against the base fabric being conveyed, and the amount of coating agent applied to the base fabric can be changed in two directions, that is, the axial direction and the conveying direction, by supplying a coating agent onto the base fabric on the side of the knife opposite to the conveying direction and individually changing the pressing force of each portion of the knife using the control device.

[0013] According to the fourth aspect of the present invention, the first roller is rotated to bring the knife into contact with and press against the backing fabric being conveyed, and the coating agent is supplied onto the backing fabric on the side opposite the conveying direction of the knife. This allows the amount of coating agent applied to the backing fabric by the knife to be varied in two directions, the axial direction and the conveying direction, so that the amount of coating agent can be increased only in areas where a large amount is needed, thereby reducing the total amount of coating agent used. In addition, the coating device has a simple structure with few component parts.

[0014] The fifth invention of the present invention is characterized in that, in any of the first to fourth inventions, the base fabric has a double-woven portion made of a double woven fabric, a single-woven portion made of a single woven fabric, a first joint formed between the double-woven portion and the single woven portion, and a second joint partially connecting the two woven fabrics that make up the double-woven portion, and the amount of coating agent applied is increased in areas of the first joint and the second joint where the weave is likely to open when the hollow woven airbag is deployed.

[0015] According to the fifth invention, it is only necessary to increase the amount of coating agent applied to only those portions of the first and second joints where the weave is likely to open when the hollow woven airbag is deployed, thereby reducing the total amount of coating agent used. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic side view of a coating device for a hollow woven airbag according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an enlarged view of part II of the embodiment. [Figure 3] FIG. 2 is a view of part II of the embodiment as seen from above. [Figure 4] FIG. 1 is a diagram showing a hollow woven airbag. [Figure 5] 10 is a view corresponding to FIG. 2 for explaining a second embodiment of the present invention. [Figure 6] 10 is a view corresponding to FIG. 2 for explaining a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] An airbag coating device (hereinafter referred to as "coating device") according to a first embodiment of the present invention will be described with reference to Figures 1 to 4. In the following description, directions will be described based on the up-down, front-rear, left-right directions shown in each drawing. Here, the forward direction is the conveying direction in which the airbag base fabric is conveyed.

[0018] First, we will describe the hollow woven airbag 1 manufactured by the coating apparatus 10. The hollow woven airbag 1 is formed by applying a silicone resin coating agent C to both sides of a substantially rectangular, planar base fabric 2 that has been woven and then cut to a predetermined shape. The base fabric 2 has a substantially rectangular double-woven portion 21 with its longitudinal axis extending in the front-to-rear direction, a single-woven portion 22 formed on the outer periphery of the double-woven portion 21, a first joint 23 formed between the double-woven portion 21 and the single-woven portion 22, and a second joint 24 that partially connects the two woven fabrics that make up the double-woven portion 21. The second joint 24 has a front second joint 24a at the front, a central second joint 24b at the center, and a rear second joint 24c at the rear, all of which are used to control the thickness direction of the hollow woven airbag 1 when it is inflated and deployed. Both bifurcated ends of the front second joint 24a are formed into a loop shape, and the opposite ends of the bifurcated portions are connected to the first joint 23. One end of the middle second joint 24b is connected to the first joint 23, and the other end is formed in a loop shape. Both ends of the rear second joint 24c are formed in a loop shape. These loop shapes are intended to avoid excessive stress concentration at the end of the second joint 24 when the hollow woven airbag 1 is inflated and deployed, and to suppress gas leakage due to openings in the fabric. A gas inlet 25 protruding diagonally forward and left is disposed in the center of the left side of the base fabric 2 in the front-to-rear direction. An inflator (not shown) is connected to the gas inlet 25, and gas is introduced from the inflator into the double-woven portion 21 during a vehicle collision. The base fabric 2 is known in the art as OPW or one-piece weave.

[0019] The amount of coating agent C applied to both sides of the base fabric 2 is approximately 1 for the thickly coated area 26 shown hatched in Figure 4, with the thinly coated areas 27 other than the thickly coated area 26 being approximately 1 / 2. There are 11 thickly coated areas 26, from left to right: thickly coated area 26a, thickly coated area 26b, thickly coated area 26c1, thickly coated area 26c2, thickly coated area 26d1, thickly coated area 26d2, thickly coated area 26e1, thickly coated area 26e2, thickly coated area 26f1, thickly coated area 26f2, and thickly coated area 26g. All of these areas are rectangular, with the same left-to-right dimension, approximately 1 / 7 of the left-to-right dimension of the base fabric assembly 2G described below, and different front-to-rear dimensions. The thick coating portion 26 is mainly arranged at the first joint 23 and the second joint 24 in areas where excessive stress concentration is likely to cause openings in the fabric when the hollow woven airbag 1 is inflated and deployed, such as the end of the second joint 24 and the first joint 23 near the gas introduction portion 25.

[0020] An apparatus for manufacturing a hollow woven airbag 1 by applying a coating agent C to a base fabric 2 will be described. As shown in FIG. 1, a coating apparatus 10 has a supply unit 11, a coating roller unit 12, a drying unit 18, and a winding unit 19. The supply unit 11 has the function of holding a base fabric assembly 2G, in a roll state, in which a plurality of uncut base fabrics 2 are aligned in the front-to-rear direction and integrated into a strip, and supplying it to the coating roller unit 12. The supply unit 11 is installed on a floor F. As shown in FIG. 3, the base fabric assembly 2G has colored yarns 2C woven between the base fabrics 2.

[0021] As shown in Figures 2 and 3, the coating roller unit 12 includes a first roller 14 located at the front, a second roller 13 located at the rear, and a knife unit 15. The first roller 14 is a roller with a first outer peripheral surface 14S having a diameter of approximately 200 mm and an axis 14A extending in the left-right direction. The second roller 13 is a roller with a second outer peripheral surface 13S having approximately the same diameter as the first roller 14 and an axis 13A extending in the left-right direction parallel to the axis 14A. A silicone coating is formed on the second outer peripheral surface 13S. The first roller 14 and the second roller 13 are arranged so that the axes 14A and 13A are coplanar, so that a clearance G is formed when the fabric assembly 2G is passed between the first outer peripheral surface 14S and the second outer peripheral surface 13S. Here, the knife unit 15 corresponds to the "knife" in the claims.

[0022] As shown in FIG. 3, the knife section 15 is divided into multiple sections in the left-right direction. Specifically, from left to right, there are eleven sections: a first section 15a, a second section 15b, a third section 15c, a fourth section 15d, a fifth section 15e, a sixth section 15f, a seventh section 15g, an eighth section 15h, a ninth section 15i, a tenth section 15j, and an eleventh section 15k. The first section 15a and the eleventh section 15k at both ends are larger in left-right dimension than the other sections, the second section 15b through the tenth section 15j. The left-right dimensions of the second section 15b through the tenth section 15j are the same. As shown in FIG. 2, the cross section of each section of the knife section 15 is the same, and the rectangular front end narrows vertically toward the front, forming an R-shaped section 15A with a diameter of approximately 25 mm at the front end. Air cylinders 16 are disposed behind each part so as to be immovable relative to the floor F, and piston rods 17 are connected to the rear of each part, so that each part can slide a predetermined amount in the front-to-rear direction but cannot move left-to-right. This allows each part to change the pressure with which the rounded portion 15A presses against the second roller 13 by changing the pressure of the air introduced into the air cylinders 16. Here, the front end of the rounded portion 15A corresponds to the "contact portion" in the claims.

[0023] As shown in Figures 2 and 3, the air pressure supplied to each air cylinder 16 connected to each section is controlled by the control device 16C. The control method will be explained using the seventh section 15g of the knife section 15 as a representative example. In Figure 3, if the feed speed of the base fabric assembly 2G is v, the time required for the colored yarn 2C to move from the front end of the thickly coated section 26e1 is x1 / v, the time required for the colored yarn 2C to move from the front end of the thickly coated section 26e1 to the rear end of the thickly coated section 26e1 is x2 / v, the time required for the colored yarn 2C to move from the rear end of the thickly coated section 26e1 to the front end of the thickly coated section 26e2 is x3 / v, and the time required for the colored yarn 2C to move from the front end of the thickly coated section 26e2 to the rear end of the thickly coated section 26e2 is x4 / v. When the control device 16C receives a signal from a colored yarn detection sensor (not shown), it enters its initial state and continues to supply high-pressure air to the air cylinder 16 connected to the seventh section 15g for x1 / v. Next, the control device 16C continues to supply low-pressure air to the air cylinder 16 connected to the seventh portion 15g during x2 / v. Next, the control device 16C continues to supply high-pressure air to the air cylinder 16 connected to the seventh portion 15g during x3 / v. Next, the control device 16C continues to supply low-pressure air to the air cylinder 16 connected to the seventh portion 15g during x4 / v. While high-pressure air is being supplied, the R-shaped portion 15A of the seventh portion 15g is strongly pressed against the second outer peripheral surface 13S of the second roller 13, thereby reducing the thickness of the coating agent C applied to the second outer peripheral surface 13S of the second roller 13. While low-pressure air is being supplied, the R-shaped portion 15A of the seventh portion 15g is weakly pressed against the second outer peripheral surface 13S of the second roller 13, thereby reducing the thickness of the coating agent C applied to the second outer peripheral surface 13S of the second roller 13. When the coating agent C on the second outer peripheral surface 13S of the second roller 13 is transferred and applied to the base fabric assembly 2G, the areas x1 and x3 corresponding to the seventh portion 15g become a thinly coated area 27, and the areas x2 and x4 become a thickly coated area 26. The other areas corresponding to the third portion 15c, fourth portion 15d, fifth portion 15e, sixth portion 15f, and eighth portion 15h also become thinly coated areas 27 and thickly coated areas 26 by similar air pressure control.

[0024] As shown in Figure 1, the fabric assembly 2G coated with the coating agent C is conveyed while being heated and dried in the drying section 18, and the coating agent C hardens. The fabric assembly 2G with the hardened coating agent C is wound into a roll in a winding section 19 installed on the floor F. Finally, the fabric assembly 2G coated with and dried with the coating agent C is unrolled from the roll and cut into a predetermined shape to obtain a plurality of hollow woven airbags 1.

[0025] The present embodiment configured as described above operates and provides the following effects. First, the coating agent C stored between the second outer peripheral surface 13S and the knife portion 15 is applied to the second outer peripheral surface 13S while the control device 16C individually changes the pressing force with which the R-shaped portions 15A of the knife portion 15 contact and press against the second outer peripheral surface 13S of the second roller 13. Then, the second roller 13 is rotated while the first roller 14 is rotated in the opposite direction to the second roller 13, and the fabric assembly 2G is passed between the second outer peripheral surface 13S and the first outer peripheral surface 14S. With a clearance G formed, the coating agent C applied to the second outer peripheral surface 13S of the second roller 13 is transferred and applied to the fabric assembly 2G while being pressed by the second roller 13 and the first roller 14, and is then conveyed. This allows the amount of coating agent C applied to the base fabric assembly 2G to be changed in two directions: left-right (axial direction of the second roller 13 and the first roller 14) and front-back (conveying direction), so that thick coating sections 26 can be provided only in areas where a large amount of coating is required, thereby reducing the total amount of coating agent C used.

[0026] In addition, a silicone coating is formed on the second outer peripheral surface 13S of the second roller 13, and the cross section of the R-shaped portion 15A, which is the contact portion of the knife portion 15, cut along a plane perpendicular to the left-right direction has an R-shape. This allows the knife portion 15 to slide smoothly over the second outer peripheral surface 13S of the second roller 13 with the coating agent C stored between the knife portion 15 and the second outer peripheral surface 13S of the second roller 13, making it easy to change the amount of coating agent C applied to each portion of the knife portion 15.

[0027] Furthermore, the base fabric 2 has a double woven portion 21, a single woven portion 22, a first joint 23 formed between the double woven portion 21 and the single woven portion 22, and a second joint 24 partially connecting the two pieces of fabric that make up the double woven portion 21. The first joint 23 and the second joint 24 have thick coating portions 26 in the areas where the weave is likely to open when the hollow woven airbag 1 is deployed. This allows the thick coating portions 26 to be formed only in the areas of the first joint 23 and the second joint 24 where the weave is likely to open when the hollow woven airbag 1 is deployed, thereby reducing the total amount of coating agent C used.

[0028] A coating apparatus 10A according to a second embodiment of the present invention will be described with reference to FIG. 5. The coating roller unit 12A does not include a second roller 13, and instead applies the coating agent C directly to the fabric assembly 2G on the first roller 14. Components that overlap with those in the first embodiment are denoted by the same reference numerals and will not be described again. The fabric assembly 2G is fed from below and rearward of the first roller 14 and conveyed forward while contacting the first outer peripheral surface 14S. The R-shaped portion 15A of the knife unit 15 contacts the fabric assembly 2G from above the first roller 14. The central axis of the knife unit 15 in the front-rear direction intersects perpendicularly with the shaft 14A. A plate-shaped dam member 18 extending in the left-right direction is disposed behind the knife unit 15, with the central axis of its cross section intersecting perpendicularly with the shaft 14A. The cross section of the dam member 18 is tapered toward the tip of the second roller 14, and its tip is positioned so that a small gap is left between the fabric assembly 2G and the dam member 18. The coating agent C is stored on the fabric assembly 2G between the knife portion 15 and the weir member 18. In this state, the first roller 14 is rotated to apply the coating agent C to the fabric assembly 2G while transporting it.

[0029] The present embodiment configured as described above operates and provides the following effects. The coating agent C is supplied while the first roller 14 is rotating and the fabric assembly 2G is in contact with the first outer peripheral surface 14S. The amount of coating agent C applied to the fabric assembly 2G by the knife unit 15 can be varied in two directions: the left-right direction (the axial direction of the first roller 14) and the front-back direction (the conveying direction). This allows the thick coating unit 26 to be provided only in areas where a large amount of coating is required, thereby reducing the total amount of coating agent C used. Furthermore, the structure of the coating roller unit 12A is simple because the second roller 13 is not required.

[0030] A coating apparatus 10B according to a third embodiment of the present invention will be described with reference to FIG. 6. The difference from the first embodiment is that the coating roller unit 12A does not include a second roller 13, and instead applies the coating agent C directly to the fabric assembly 2G while it is being transported. Components that overlap with the first embodiment are denoted by the same reference numerals and will not be described again. The fabric assembly 2G is supplied from below and rearward of the first roller 14 and transported forward while contacting the first outer peripheral surface 14S. The R-shaped portion 15A of the knife unit 15 contacts the stretched fabric assembly 2G from above between the first roller 14 and a transport roller 19 positioned forwardly from the first roller 14. The central axis of the knife unit 15 in the front-to-rear direction is perpendicular to the fabric assembly 2G. A plate-shaped weir member 18 extending in the left-to-right direction is disposed behind the knife unit 15 and parallel to the knife unit 15. The cross section of the dam member 18 is formed so that the thickness narrows toward the tip on the side of the fabric assembly 2G, and the tip is positioned so that there is a small gap between the fabric assembly 2G and the dam member 18. The coating agent C is stored on the fabric assembly 2G between the knife section 15 and the dam member 18. In this state, the first roller 14 is rotated to apply the coating agent C to the fabric assembly 2G while transporting it.

[0031] The present embodiment configured as described above operates and provides the following effects. The coating agent C is supplied while the first roller 14 is rotating and the fabric assembly 2G is in contact with the first outer peripheral surface 14S. The amount of coating agent C applied to the fabric assembly 2G by the knife unit 15 can be varied in two directions: the left-right direction (the axial direction of the first roller 14) and the front-back direction (the conveying direction). This allows the thick coating unit 26 to be provided only in areas where a large amount of coating is required, thereby reducing the total amount of coating agent C used. Furthermore, the need for the second roller 13 negates the need for the coating roller unit 12B, simplifying its structure.

[0032] Although specific embodiments have been described above, the present invention is not limited to those external appearances and configurations, and various modifications, additions, and deletions are possible within the scope of the present invention. For example, the following can be mentioned.

[0033] 1. In the above embodiment, a plurality of uncut base fabrics 2 are aligned in the front-rear direction and integrated into a strip-like fabric assembly 2G, which is held in a roll state and supplied to the coating roller units 12, 12A, and 12B. However, this is not limiting, and a single uncut base fabric 2 may be supplied to the coating roller units 12, 12A, and 12B for coating.

[0034] 2. In the above embodiment, the pressing force that causes each part of the knife section 15 to come into contact and press is generated by air pressure, but this is not limited to this, and pressure control using hydraulics or a servo motor, etc., can also be used.

[0035] 3. In the above embodiment, the airbag to be coated is a hollow woven airbag 1, but this is not limited to this and the invention can also be applied to a plain woven airbag in which cut parts are sewn together. [Explanation of symbols]

[0036] 1. Woven airbag 2 Base fabric 2G base fabric assembly 10, 10A, 10B Coating equipment 12, 12A, 12B Coat roller section 13 Second Roller 13S 2nd outer surface 13A axis 14 First Roller 14S 1st outer surface 14A shaft 15 Knife section (knife) 15A R-shaped part (contact part) 15a~15k part 16C Control Unit 21 Double Oribe 22 Single Oribe 23 1st joint 24 Second joint 26 Thick coating area 27 Lightly painted area C Coating Agent G clearance

Claims

1. An airbag coating apparatus comprising: a knife that is pressed radially against a second outer peripheral surface that is the outer peripheral surface of the second roller, capable of storing a coating agent between the knife and the second roller, and whose contact portion with the second roller extends in the axial direction and is divided into a plurality of portions in the axial direction so that the pressing force of each portion against the second outer peripheral surface can be changed individually; and a control device that controls the pressing force of each portion, The first roller is rotated and the second roller is rotated in the opposite direction to the first roller, and the base fabric of the airbag is passed between the first outer peripheral surface, which is the outer peripheral surface of the first roller, and the second outer peripheral surface, thereby transferring and conveying the coating agent applied to the second outer peripheral surface of the second roller onto the base fabric, An airbag coating device that can change the amount of coating agent applied to the second outer surface in two directions, the axial direction and the conveying direction, by individually changing the pressing force of each part of the knife using the control device.

2. 2. The airbag coating device according to claim 1, wherein a silicone coating is formed on the second outer peripheral surface of the second roller, and the contact portion of the knife has an R-shaped cross section cut along a plane perpendicular to the axial direction.

3. An airbag coating apparatus comprising: a first roller; a knife that is pressed radially against a first outer peripheral surface that is the outer peripheral surface of the first roller, and whose contact portion with the first roller extends in the axial direction and is divided into a plurality of portions in the axial direction so that the pressing force of each portion against the first outer peripheral surface can be individually changed; and a control device that controls the pressing force of each portion, An airbag coating device that can change the amount of coating agent applied to the base fabric in two directions, the axial direction and the conveying direction, by supplying a coating agent onto the base fabric on the side opposite to the conveying direction of the knife while conveying the base fabric between the first outer peripheral surface and the knife while rotating the first roller and individually changing the pressing force of each part of the knife using the control device.

4. An airbag coating apparatus comprising: a first roller; a knife that is pressed in a direction perpendicular to the base fabric of the airbag in a tensioned state as the airbag rotates and is in contact with a first outer peripheral surface of the first roller, the first outer peripheral surface being fed in the conveying direction, the knife having a contact portion with the base fabric extending parallel to the axial direction of the first roller and divided into a plurality of portions in the axial direction so that the pressing force of each portion against the base fabric can be individually changed; and a control device that controls the pressing force of each portion, An airbag coating device that rotates the first roller to press the knife against the base fabric being transported, supplies coating agent onto the base fabric on the side opposite the transport direction of the knife, and changes the pressing force of each part of the knife individually using the control device, thereby changing the amount of coating agent applied to the base fabric in two directions, the axial direction and the transport direction.

5. 5. An airbag coating device according to claim 1, wherein the base fabric has a double-woven portion made of a double-woven fabric, a single-woven portion made of a single-woven fabric, a first joint formed between the double-woven portion and the single-woven portion, and a second joint that partially connects the two pieces of fabric that make up the double-woven portion, and wherein the amount of coating agent applied is increased in areas of the first joint and the second joint where the weave is likely to open when the hollow-woven airbag is deployed.

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