JP2010234909A - Method for manufacturing airbag and the airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve airtightness of a joining portion of an airbag, and to prevent adhesion of an adhesive seal to a sewing device. <P>SOLUTION: In the curtain airbag arranged on a side part of a cabin of an automobile, base fabric parts 11 and 12 are superposed, and are joined along an inner joining part 15. The inner joining part 15 includes two coating part 31 on which the adhesive seal 30 is coated, and a sewed part 37 obtained by sewing a non-coating part 33 between the coating parts 31. The non-coating part 33 is formed by pressing one preliminary coating part 40 by a tool. Adhesion of the adhesive seal 30 to the sewing machine 51 can be prevented, and maintenance work of the sewing machine 51 can be facilitated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an airbag manufacturing method and an airbag that are inflated and deployed by introducing a gas.

  2. Description of the Related Art Conventionally, a so-called curtain airbag that deploys along a side window portion of an automobile cabin is known as an airbag that is inflated and deployed by introducing gas. This type of airbag is required to absorb the kinetic energy of the occupant's head with a short stroke at the time of a side collision, and maintain the inflated and deployed state for a predetermined time, for example, several seconds, when the vehicle rolls over. Is required. Therefore, the airbag is required to have a configuration that maintains the internal pressure of the airbag for a long time in a relatively high state as compared with the airbag mounted on other portions.

  In this regard, for example, with respect to a portion where the base fabrics are joined together by sewing, a configuration is known in which the base fabrics are bonded together with an adhesive sealant and the bonded portions are sewn with a sewing thread (see, for example, Patent Document 1). ).

  In addition, for example, a configuration is known in which a polyurethane sheet between base fabrics is heat-melted to join base fabrics together, and the base fabrics are sewn together, or a portion sandwiching an unvulcanized rubber sheet is sewn. (See, for example, Patent Document 2).

  However, as described above, in the configuration in which the portion where the adhesive seal such as the adhesive seal material or the unvulcanized rubber sheet is arranged is sewn, each part of the sewing machine that is a sewing device, for example, a sewing needle, a press fitting, and a bobbin Further, there is a problem that the adhesive seal adheres to the bobbin case, the hook, etc., and the productivity is deteriorated. That is, the adhesive seal sticks to each part and is difficult to remove.In particular, when the adhesive seal adheres to the vicinity of the bobbin in the bobbin case for adjusting the lower thread, the lower thread torque of the sewing machine is out of the specified range. The joint strength (thread tension) may be inferior, and the lower thread may become entangled in the bobbin case. For this reason, the troublesome operation | work which removes the adhered adhesive seal from each part of a sewing machine is needed regularly, and it has the problem that productivity falls and manufacturing cost rises.

  Also known is a configuration in which sewing needles are sewn along the outer edge of the portion where the base fabrics are bonded together, that is, the opposite edge of the air chamber into which gas is introduced, and stains on the sewing needle are suppressed. (See, for example, Patent Document 3).

  In this configuration, although contamination of the sewing needle can be suppressed, the sewing thread is exposed on one side of the adhesive seal, and in the configuration in which gas is supplied to both sides of the adhesive seal, the sewing needle is supplied to one side of the adhesive seal. Gas is liable to leak from the seam. Further, in the sewing process, an operation of accurately sewing along one side of the edge of the adhesive seal is required, and it is not easy to reduce the manufacturing cost.

JP 2006-273109 A (Page 3, FIG. 2) JP-A-10-129380 (5th page, FIG. 11, FIG. 13) JP 2003-2149 A (page 3, FIGS. 1-4)

  As described above, in the configuration in which the portion where the adhesive seal is disposed is sewn, it is necessary to remove the adhesive seal attached to each part of the sewing machine, which makes it difficult to improve productivity and increase the manufacturing cost. is doing. In addition, in the configuration in which sewing is performed along one edge of the adhesive seal, the gas supplied to one side of the adhesive seal is easily leaked, and an operation for accurately sewing along the one side of the adhesive seal is required. Therefore, it is not easy to reduce the manufacturing cost.

  This invention is made | formed in view of such a point, and it aims at providing the manufacturing method and airbag of an airbag which can ensure airtightness and can reduce manufacturing cost.

  The method for manufacturing an airbag according to claim 1 is a method for manufacturing an airbag in which the overlapped base fabric portions are joined linearly at a joint portion bonded and sewn, and an adhesive seal is provided between the base fabric portions. The two strips applied and the non-application portion with a predetermined width dimension that is not applied to the adhesive seal and is formed between the application portions are formed along the non-application portion using a sewing device provided with a sewing needle. Then, the base fabric portions are sewn together with a thread to form a sewn portion.

  The airbag manufacturing method according to claim 2 is the airbag manufacturing method according to claim 1, wherein the sewing device is slidably contacted with a step portion generated by a difference in thickness between the application portion and the non-application portion. The guide part which guides is provided.

  The airbag manufacturing method according to claim 3 is the airbag manufacturing method according to claim 1 or 2, wherein a single pre-applied portion to which an adhesive seal is applied is formed, and the pre-applied portion in the width direction is formed. The central portion is pressed along the longitudinal direction to eliminate the adhesive seal between the base fabric portions and form a non-application portion.

  The method for manufacturing an airbag according to claim 4 is the method for manufacturing an airbag according to claim 1 or 2, wherein two coated portions are formed with a constant interval, and a portion between the coated portions is formed. This is a non-application part.

  The airbag according to claim 5 is an inflatable portion that constitutes an air chamber that inflates when gas is supplied between the overlapped base fabric portions, and a linear shape that is located in the inflatable portion and joins the base fabric portions together. The joint portion is formed of two strips of application portions in which an adhesive seal is applied between the base fabric portions, and a non-fixed width dimension that is located between the application portions and is not applied with the adhesive seal. An application part and the sewing part by which the base fabric parts were sewn along the above were provided.

  According to the method for manufacturing an airbag according to claim 1, by forming a non-applied portion having a predetermined width dimension to which an adhesive seal is not applied, and sewing the base fabric portions along the non-applied portion, adhesion and A joint portion for joining the base fabric portions firmly and airtightly can be formed by sewing. Since the joining portion includes an application portion in which an adhesive seal is applied on both sides of the sewing portion, gas leakage can be suppressed on both sides of the sewing portion to improve airtightness. During sewing, the sewing needle of the sewing device makes no or little contact with the adhesive seal, so the adhesion of the adhesive seal to the sewing device, including the sewing needle, is suppressed, making it easy to maintain the sewing device and increase productivity. The manufacturing cost can be reduced.

  According to the method for manufacturing an airbag according to claim 2, in addition to the effect according to claim 1, by guiding the sewing needle in sliding contact with the step portion generated by the difference in thickness between the non-application portion and the application portion. The sewing part can be formed by sewing an accurate position in the non-application part with a simple configuration. It is possible to prevent the sewing needle from coming into contact with the adhesive seal and facilitate maintenance work of the sewing apparatus, and it is not necessary to provide a complicated control device for guiding the movement of the sewing needle, thereby reducing the manufacturing cost.

  According to the method for manufacturing an airbag according to claim 3, in addition to the effect according to claim 1 or 2, the apparatus for applying an adhesive seal may apply a single adhesive seal, simplifying the manufacturing apparatus, Manufacturing cost can be reduced.

  According to the method for manufacturing an airbag according to claim 4, in addition to the effect according to claim 1 or 2, the sewing needle does not come into contact with the adhesive seal, the maintenance work of the sewing means can be facilitated, and the manufacturing cost is reduced. Can be reduced.

  According to the airbag of the fifth aspect, the joint portion disposed in the inflating portion can firmly and airtightly join the base fabric portions by adhesion and sewing, thereby defining the airbag deployment shape. Gas is supplied along the both sides in the longitudinal direction of the joint portion arranged in the inflatable portion, but since it has an application portion to which an adhesive seal is applied along both sides of the sewing portion, the airtightness can be easily improved. . Since the sewing part is formed in the non-application part where the adhesive seal is not applied, it is possible to prevent the adhesive seal from contacting the sewing device during sewing. Therefore, adhesion of the adhesive seal to the sewing device can be suppressed, maintenance work of the sewing means can be facilitated, productivity can be improved, and manufacturing cost can be reduced.

It is explanatory drawing of the manufacturing process which shows one Embodiment of the manufacturing method of the airbag of this invention. It is explanatory drawing of the state which extended the base fabric part of the airbag same as the above to planar shape. It is explanatory drawing of the manufacturing apparatus used for the manufacturing method of an airbag same as the above. It is explanatory drawing of the manufacturing process which shows other embodiment of the manufacturing method of the airbag of this invention. It is explanatory drawing of the manufacturing process which shows other embodiment of the manufacturing method of the airbag of this invention. It is explanatory drawing of the manufacturing process which shows other embodiment of the manufacturing method of the airbag of this invention. It is a side view of the manufacturing apparatus used for the manufacturing method of an airbag same as the above. It is explanatory drawing of the manufacturing apparatus used for the manufacturing method of an airbag same as the above.

  Hereinafter, an embodiment of an airbag manufacturing method and an airbag according to the present invention will be described with reference to the drawings.

  In FIG.1 (e) and FIG.2, 1 is an airbag and the airbag apparatus provided with this airbag 1 is arrange | positioned at the roof side part of the side part of the compartment of the motor vehicle as a vehicle. The airbag 1 is also called a curtain airbag, a side impact airbag, a side airbag, an inflatable curtain type, or a head protection airbag. When the airbag 1 receives an impact such as a side collision, The airbag 1 is deployed in a planar shape on the side of the occupant along the side of the passenger compartment to protect the occupant as a protected object.

  The airbag device is a so-called front / rear seat airbag that can protect passengers in the front / rear seats, and is stored in an elongate folded state on a roof side part surrounded by a roof side rail and a head lining. 1 and an inflator (not shown) that is stored above the vehicle body of the passenger in the rear seat and supplies gas to the airbag 1, and is attached to the roof side rail via a bracket.

  The airbag 1 includes an airbag main body 3 having a bag shape, and although not shown, an inner tube disposed inside the airbag main body 3 for guiding gas, and a front end portion of the airbag main body 3 And a tension strap, which is a string-like base fabric attached to the.

  The airbag body 3 is formed into a flat bag shape by folding back one base fabric or overlapping a plurality of base fabrics and joining the outer peripheral portion or the like. A first base fabric portion 11 and a second base fabric portion 12 as two base fabric portions, which are called together with a panel or the like, are overlapped, and an outer peripheral joint portion 14 that joins the base fabric portions 11 in an airtight or substantially airtight manner. Further, an inner joint portion 15 as a joint portion is formed, and an inflatable portion 17 having a hollow air chamber 16 therein is formed.

  More specifically, the base fabric portions 11 and 12 that are a pair of opposing base fabric panels are arranged inside and outside the vehicle compartment, that is, the passenger, and the outer peripheral portions of these base fabric portions 11 and 12 are arranged at the rear end portion. Except for the gas introduction part 18, the expansion part 17 having the air chamber 16 is formed by air-tight stitching at the linear outer peripheral joint part 14. The inflatable portion 17 is partitioned by a plurality of linear inner joint portions 15 formed in the inflatable portion 17, the width dimension at the time of deployment is restricted, and the front and rear direction of the airbag body 3 is defined. A communication part 21 that is located in the upper part along the longitudinal direction and guides gas, a front seat protection part 22 that communicates with the front side of the communication part 21, and a rear seat protection part 23 that communicates with the rear side of the communication part 21 And etc. are formed. Further, the end portion of the linear inner joint portion 15 is formed such that a part thereof is continuous with the outer peripheral joint portion 14 and a part thereof is closed in a ring shape. A part protection part 25 is formed.

  Further, a coating agent such as silicone is applied to the inner surfaces of the respective base fabric portions 11 and 12, thereby improving airtightness and heat resistance. A plurality of attachment pieces 26 that are attachment portions for attachment to the bracket are formed at a predetermined interval on the upper edge portion of the airbag body 3. These attachment pieces 26 are formed by extending one or both of the base fabric portions 11 and 12, folding back and sewing. Each attachment piece 26 is formed with a through hole to which attachment means such as a screw is attached.

  And the inner side joining part 15 and the outer periphery joining part 14 are joining the base fabric parts 11 and 12 firmly and airtightly, combining bonding and sewing, respectively. More specifically, as shown in FIG. 1 (e), the inner joint portion 15 is a two-line-like structure in which, for example, an adhesive seal 30 made of silicone is applied to airtightly bond the base fabric portions 11 and 12 to each other. A single linear non-coating having a predetermined width dimension over the entire length of the coating portion 31, 31 and the coating portion 31, 31 between which the adhesive seal 30 is not applied at all or substantially. A portion 33 and a single linear sewing portion 37 that are located at the center in the width direction of the non-application portion 33 and are sewn together using threads 35 and 36 are provided. That is, application portions 31, 31 that are seal bands are formed on both sides of the sewing portion 37, and the yarn of the sewing portion 37 is protected from gas by these application portions 31, 31, and from the needle hole of the sewing portion 37. Airtightness is enhanced so that gas does not leak. Here, the fact that it is not substantially applied means that the presence of the adhesive seal 30 to the extent that the thickness cannot be measured is allowed.

  The outer peripheral joint 14 will be described as having the same configuration as the inner joint 15. However, the outer peripheral joint 14 is formed separately on one strip of the coating portion 31 and the outer side of the coating portion 31, that is, on the side where no gas is supplied. It can also be constituted by a single sewing part 37 made.

  Next, the manufacturing process of the airbag 1 will be described focusing on the manufacturing process of the inner joint portion 15.

  First, as the base cloth cutting process which is the first process, the first base cloth part 11 and the second base cloth part 12 are each cut into a predetermined shape. Here, the first base fabric portion 11 is an upper base fabric disposed on the upper side in the manufacturing process, and the second base fabric portion 12 is a lower base fabric disposed on the lower side in the manufacturing process.

  Next, as a seal coating process which is the second process, the inner joint 15 and the outer circumference joint are formed on the silicone-coated surface of the second base fabric part 12 which is the lower base cloth using a seal coating machine. Along the position of the portion 14, as shown in FIG. 1 (a), an adhesive seal 30 is applied in a single line shape. The seal applicator can handle a high-viscosity fluid of 150 to 400 Pa · s, and discharges and supplies a predetermined amount while mixing the main agent and the curing agent.

  Next, before the adhesive seal 30 is cured, as a seal bonding step, which is a third step, the silicone-coated surface is directed downward on the second base fabric portion 12 to which the adhesive seal 30 has been applied. The first base fabric portion 11 is stacked, and pressing is performed to apply a pressure from above and below to a specified thickness while closely contacting. Here, when the thickness dimension of the first base cloth part 11 and the second base cloth part 12 is 0.25 mm, the thickness dimension of the press space is 1.5 mm and the adhesive seal 30 is 1.0 mm. The first base cloth part 11 and the second base cloth part 12 are brought into close contact with each other while being spread to a thickness of 1 mm to form a preliminary application part 40 as shown in FIG. In this step, a member such as an inner tube is disposed at a predetermined position between the first base cloth part 11 and the second base cloth part 12.

  Next, before the adhesive seal 30 is cured, a molding process which is a fourth process is performed. In this step, a tool 42 shown in FIG. 3 is used. The tool 42 has a molded body 43 at a tip portion which is a lower end portion, and the molded body 43 is driven by a driving unit. The driving means can move the molded body 43 with the same movement as that of the seal applicator, and includes, for example, a 6-axis robot, an XYZ orthogonal robot, a scalar robot, or the like. The molded body 43 includes a molded body main body 44 and a rotating shaft 45 that rotatably supports the molded body main body 44. The molded body 44 is formed of a hard and slippery material such as metal or synthetic resin, and a horizontal pressing portion 44a having a large diameter is formed at the center in the width direction, and gradually increases in diameter on both sides of the horizontal pressing portion 44a. An inclined surface side pressing portion 44b is formed so as to be reduced.

  Therefore, in this molding process, before the adhesive seal 30 is cured, a portion to which the adhesive seal 30 is applied, that is, a preliminary application portion, is applied from one of the base fabric portions 11 and 12, here the upper side of the first base fabric portion 11. The preliminary application part 40 is moved while pressing the pre-applied part 40 with the molded body 43 of the tool 42 so as to follow the pre-applied part 40 from right above the central part in the width direction. Then, as shown in FIG. 1 (c), the adhesive seal 30 moves to both sides in the molded body 43 of the tool. The portion pressed by the horizontal pressing portion 44a has no or substantially no adhesive seal 30, that is, the thickness dimension is substantially zero, and the first base fabric portion 11 and the second base fabric portion 12 are separated. The non-application part 33 of a fixed width dimension which is a so-called zero-seal part in direct contact is formed. Further, the portions on both sides pressed by the side pressing portion 44b become inclined step portions 48, and the two coating portions 31 are formed including the step portion 48 portion. In addition, the width dimension L1 of the non-application part 33 is set to 2.0 mm or more and 10.0 mm or less.

  Note that the shape of the molded body 44 of the molded body 43 can be an arbitrary shape, and the stepped portion 48 having an arbitrary shape can be formed. When the dimension between the outer edges of the stepped portion 48 is L2 with respect to the width dimension L1 of the non-application portion 33, it is desirable that L1 ≦ L2. Further, the molded body 44 can be fixed, for example, as a truncated cone having a small diameter on the distal end side, not rotatable. The driving means is, for example, a 6-axis robot that freely moves the molded body 43 three-dimensionally, an XYZ orthogonal robot that moves the molded body 43 in the XYZ directions without tilting, or a scalar robot. Composed.

  Then, the adhesive seal 30 completes curing in about 12 hours and maintains the shape of the application part 31.

  Next, a sewing process which is a fifth process is performed. In this step, as shown in FIG. 1 (d), a sewing machine 51 as a sewing device is used. The sewing machine 51 has a sewing needle 52 and a presser fitting 54 that also serves as a guide device for guiding the position of the sewing needle 52. The presser fitting 54 includes a through hole portion 55 through which the sewing needle 52 is inserted, and guide portions 56 that are located on both sides of the through hole portion 55 and are inclined so as to be slidable along the stepped portions 48 on both sides. Further, a horizontal guide portion 57 that functions in the same manner as a normal pressing metal fitting extends from the upper end portion of the guide portion 56 in the horizontal direction.

  Therefore, the sewing machine 51 is positioned not only in the vertical direction but also in the horizontal direction by lowering the presser fitting 54 to the position indicated by the wavy line A, so that the guide portions 56 on both sides are in sliding contact with the step portions 48 on both sides. The through hole 55, that is, the sewing needle 52 is arranged at the center in the width direction of the non-application part 33. By sewing the sewing machine 51 in this state, the first base fabric portion 11 and the second base fabric portion 12 are threaded along the central portion in the width direction of the non-application portion 33 by the threads 35 and 36. A sewing portion 37 is formed by sewing in a linear shape.

  In this way, as shown in FIG. 1 (e), the inner joint portion 15 and the outer peripheral joint portion 14 including the application portion 31, the non-application portion 33, and the sewing portion 37 are formed. In this sewing process, the attachment piece 26 is sewn.

  Next, as the sixth inspection process, the deployment state of the airbag 1 is confirmed.

  Next, as an assembly process, which is a seventh process, the airbag 1 is folded into an elongated shape and connected to an inflator or the like to constitute an airbag apparatus.

  When an automobile equipped with the airbag device undergoes a side collision or the like, the inflator is activated under the control of a control device equipped with a sensor, gas is introduced into the air chamber 16 of the airbag 1, and the inflating portion 17 Expands and expands. At this time, the first base fabric portion 11 and the second base fabric portion 12 are joined by the inner joint portion 15 disposed in the inflatable portion 17, and the shape of the inflatable portion 17 is regulated, so that a desired flat shape is obtained. Inflates and expands into shape to protect occupants. Furthermore, the inner joint 15 and the outer joint 14 are hermetically sealed by the application part 31 of the adhesive seal 30 to suppress gas leakage, and the internal pressure of the airbag 1 is maintained for a relatively long time.

  As described above, according to the present embodiment, the non-applied part 33 having a certain width dimension to which the adhesive seal 30 is not applied is formed, and the base is formed along the non-applied part 33, that is, between the applied parts 31. By sewing the cloth parts 11 and 12 together to form the sewing part 37, the inner joint part 15 and the outer joint part 14 that join the base cloth parts 11 and 12 firmly and airtightly by bonding and sewing can be formed.

  When sewing, the sewing needle 52 of the sewing machine 51 does not contact the adhesive seal 30 at all or hardly, so that not only the portion having a small thickness can be easily sewn, but also the sewing needle 52 of the sewing machine 51, the presser fitting 54 Suppresses adhesion of the adhesive seal 30 to the hook, bobbin, bobbin case, etc., and facilitates maintenance work of the sewing machine 51.In other words, it eliminates the need for periodic maintenance to remove the adhesive seal 30, improving productivity. In addition, the manufacturing cost can be reduced. For example, in the above configuration, if the portion to which the adhesive seal 30 is applied is sewed without providing the non-application portion 33, about 0.2 g of debris is adhered when 50 m (8.3 m / body) is sewn. Things could be lost and sewing could be performed continuously.

  Further, since the inner joint portion 15 and the outer peripheral joint portion 14 are provided with the application portions 31 to which the adhesive seal 30 is applied on both sides of the sewing portion 37, the heat and force applied to the sewing portion 37 when the airbag 1 is inflated and deployed. It can suppress, can protect the sewing part 37, and can suppress gas leakage on both sides of the sewing part 37 to improve the airtightness.

  Further, since the sewing machine 51 guides the sewing needle 52 by positioning the guide part 56 of the presser fitting 54 in sliding contact with the step part 48 formed by the thickness of the application part 31 on both sides, the width of the non-application part 33 The sewing portion 37 can be accurately formed at a desired position without being displaced along the central portion in the direction. For this reason, while being able to prevent the airbag 1 from contacting the adhesive seal 30, it is possible to suppress gas leakage, improve airtightness, and maintain a state inflated and deployed for a long time. Further, it is not necessary to provide a highly accurate control device for guiding the movement of the sewing needle 52 for the sewing machine 51, and the manufacturing cost can be reduced.

  Further, in the seal bonding process, it is only necessary to form the pre-applied portion 40 of the single adhesive seal 30, so the shape of the nozzle tip (after mixer) of the seal coating machine can be simplified, that is, the manufacturing apparatus can be simplified, Equipment costs can be reduced and manufacturing costs can be reduced.

  Further, in order to accelerate the curing (curing) of the adhesive seal 30 of the base fabric portions 11 and 12 sandwiching the adhesive seal 30, when performing the heating and heating treatment in a warm warehouse (oven), the non-application portion 33 and There is an effect that the adjacent portions can be heated relatively well through the base cloth portions 11 and 12, that is, the so-called heat can be accelerated. Therefore, the portion in the vicinity of the non-application part 33 is cured by a short time oven treatment.

  In this way, the airbag 1 that has high strength and airtightness of the joint portions 14 and 15 and can maintain the internal pressure for a long time can be provided at low cost. Moreover, since the internal pressure of the airbag 1 can be easily maintained at a high level, the output of the inflator can be reduced and the manufacturing cost can be reduced.

  In the above-described embodiment, the non-application part 33 is formed by pressing so that the adhesive seal 30 does not remain, so that the part where the adhesive seal 30 is applied after the press in the seal application process is copied. Although it performed, it is not restricted to this structure, A shaping | molding process can also be performed simultaneously in the case of the press of a seal | sticker application process. For example, for a base cloth that is sealed like a coated cloth, air contained in the pre-applied part 40 of the adhesive seal 30 can be easily removed by pouring in a lightly pressed state. At the same time, the non-application part 33 and the step part 48 can be formed.

  For example, as shown in FIG. 4, at least one of the flat upper table 61 and the lower table 62 used in the press in the seal application process, in the present embodiment, the non-application part 33 is provided on the lower surface side of the upper table 61. It is also possible to integrally form a convex shaped part 64 to be formed. The molding portion 64 has the same cross-sectional shape as the lower side portion of the molded body 44, that is, has a horizontal pressing portion 64a and a side pressing portion 64b, and is formed along the entire length of the joint portions 14 and 15. Has been.

  Therefore, as shown in FIG. 4 (a), the base fabric portions 11 and 12 are disposed between the upper table 61 and the lower table 62 to apply the adhesive seal 30 to form the preliminary application portion 40. As shown in FIG. 4B, the non-application part 33 and the pair of application parts 31 are simultaneously provided along the longitudinal direction of the preliminary application part 40 to which the adhesive seal 30 is applied by bringing the upper table 61 and the lower table 62 closer to each other. The manufacturing cost can be reduced by shortening the time required for manufacturing the airbag 1. In this configuration, the shapes of the application part 31 and the non-application part 33 can be freely defined by the shape of the molding part 64. Further, the thickness dimension of the base fabric parts 11 and 12 and the application part 31 can be controlled by setting the height dimension, that is, the projecting dimension of the molding part 64.

  Further, for example, as shown in FIG. 5, at least one of the upper table 61 and the lower table 62, in the present embodiment, an opening 66 is formed in the lower table 61 along the preliminary application portion 40. A molding part 64 that is separate from the lower table 62 and a cylinder 68 that is a driving means for moving the molding part 64 up and down can be disposed along the part 66. In this configuration, as shown in FIG. 5 (a), the upper table 61 and the lower table 62 are pressed close to each other, and at the same time, as shown in FIG. 5 (b), the cylinder 68 is driven to form. By pushing the portion 64 into the opening 66, the non-application portion 33 and the pair of application portions 31 can be formed simultaneously along the longitudinal direction of the preliminary application portion 40 to which the adhesive seal 30 has been applied, and the time required for manufacturing the airbag 1 Manufacturing cost can be reduced.

  In addition, in order to make the in-process work-in-process flow smooth, a method of sewing the non-application part 33 in an uncured state of the application part 31 or a method of sewing in a semi-cured state can be employed. Even in the uncured / semi-cured state, the adhesive seal 30 hardly exists in the non-applied portion 33, so that the stain on the sewing machine 51 proceeds more slowly than in the case where the thick adhesive seal 30 is present as in the prior art. In addition, curing can be promoted by locally raising the temperature of the coating part 31 with a hot press body similar to a pressing device after pressing the non-coating part 33 or after pressing. Since there is only a very small amount of the adhesive seal 30 in the non-applied portion 33, the curing progresses quickly, and the base fabric portions 11 and 12 can be pressed more strongly without adjusting control to obtain the predetermined thickness of the adhesive seal 30. The temperature is easy, so the so-called heat environment is improved.

  Further, in each of the above-described embodiments, after forming one pre-applied part 40, the pre-applied part 40 is pressed to form two applied parts 31 and one non-applied part 33. Without being limited to this configuration, the two coating portions 31 can be formed from the two adhesive seals 30 without forming the preliminary coating portion 40.

  For example, for the seal application process, along the positions of the inner joint 15 and the outer joint 14 on the silicone-coated surface of the second base fabric 12 that is the lower base using a seal applicator. Then, as shown in FIG. 6 (a), two strips are applied simultaneously, or are applied in a linear manner in two steps one by one, and two adhesive seals 30 are applied close to each other.

  Then, as shown in FIG. 6 (b), the first base cloth part 11 is overlaid on the second base cloth part 12 and the pressure is applied in the vertical direction as shown in FIG. By performing the press to make the thickness, two coated portions 31 and one non-coated portion 33 are formed.

  Then, after the adhesive seal 30 is cured, sewing is performed in the sewing process, so that the sewing portion 37 is formed in the non-application portion 33 and the joint portions 14 and 15 can be formed.

  As described above, in the configuration in which the two coated portions 31 are formed from the two adhesive seals 30 at a predetermined interval, the molding process can be omitted, and the adhesive seal 30 is completely present in the non-coated portion 33. As a result, the sewing needle 52 does not come into contact with the adhesive seal 30, and the adhesion of the adhesive seal 30 to the sewing machine 51 can be prevented, maintenance work of the sewing machine 51 can be facilitated, and the manufacturing cost can be reduced. In the configuration in which two strips of application portions 31 are formed simultaneously, two strips of coating portions 31 and one strip of non-application portion 33 can be formed simultaneously, and the airbag 1 can be manufactured quickly.

  In the configuration shown in FIG. 6 as well, as in the configuration shown in FIGS. 1 to 5, a tool 42 or the like is used to press the non-application portion 33 in the direction in which the application portions 31 on both sides are separated from each other. The shapes of the non-application part 33, the application part 31, and the step part 48 can also be defined.

  In addition, for the configuration shown in FIG. 6, in addition to applying two strips of adhesive seals 30 to one of the base fabric portions 11, 12, one strip is applied to each of the first base fabric portion 11 and the second base fabric portion 12, It is also possible to apply the adhesive seal 30 in such a positional relationship that a gap is formed when the layers are stacked, and press the layers while being stacked at a relatively high speed.

  Further, in each of the above embodiments, before the seal application step, a separator portion that prevents intrusion of the adhesive seal 30 is formed in advance along the position where the non-application portion 33 is formed, and the shape of the non-application portion 33 And the adhesion of the adhesive seal 30 to the sewing machine 51 can be prevented. For example, a non-adhesive separator is formed in a linear shape on the second base cloth 12 by applying a quick-drying foamed resin along the position where the non-application part 33 is formed. Two adhesive seals 30 are applied along both sides of the first base fabric portion 11, the first base fabric portion 11 is layered on the second base fabric portion 12, and pressure is applied from above and below to a prescribed thickness. By performing pressing, two strips of application portions 31 and one strip of non-application portion 33 are formed. In this configuration, the coating portion 31 and the non-application portion 33 are formed with substantially the same thickness, and the sewing portion 37 is formed so as to penetrate the separator portion. There is no adhesiveness and the sewing machine 51 can be prevented from being stained.

  Further, in the configuration for forming the separator portion, in the configuration in which two strips of the adhesive seal 30 are applied along the both sides of the separator portion, or the single strip of the adhesive seal 30 is applied so as to cover the separator portion. The coating part 40 is formed, the first base cloth part 11 is stacked on the second base cloth part 12 and pressed, and further, the application part 31 on both sides is separated from each other by the tool 42 along the separator part. It is also possible to eliminate the adhesive seal 30 in the separator portion by pressing in the direction in which it is applied.

  In each of the above embodiments, the manufacturing apparatus including a seal applicator that applies an adhesive seal onto the second base fabric portion 12 can take various configurations. In the manufacturing apparatus to be formed, by performing the seal coating process that requires relatively time and complicated equipment and other processes in parallel, the time required for production is shortened while effectively using the equipment, Manufacturing cost can be reduced.

  For example, as in the manufacturing apparatus 71 shown in FIG. 7, a seal coating machine 72 and a device for transporting and pressing the base fabric portions 11 and 12 to the seal coating machine 72 can be provided. That is, the manufacturing apparatus 71 includes two seal applicators 72 at the top of the main frame 74, and includes an upper table device 75 positioned below the seal applicator 72, and further includes the upper table. A lower table device 76 is provided below the device 75. The upper table device 75 is provided with upper holding surface portions 75a and 75a capable of sucking and holding the base fabric portions 11 and 12 on the upper surface and the lower surface, and further rotated by a motor 75b so that the upper and lower surfaces can be switched. ing. Further, the lower table device 76 includes a lower holding surface portion 76a on which the base fabric portions 11 and 12 are placed, and the lower holding surface portion 76a is pressed against the upper holding surface portion 75a facing downward, that is, a press to be pressed. It is movable between the position P1 and a work position P2 that is drawn below the press position P1 and on the front side of the operator.

  Therefore, in the manufacturing apparatus 71, the operation is started in a state where the cut second base cloth portion 12 is placed on the lower holding surface portion 76a of the work position P2 of the lower table device 76. Then, the lower holding surface portion 76a moves to the press position P1. Here, the upper table device 75 sucks the second base cloth portion 12, and the lower holding surface portion 76a returns to the work position P2. Here, the upper holding surface portions 75a and 75a of the upper table device 75 are rotated so that the inner surface of the second base cloth portion 12 faces upward. Then, an adhesive seal 30 is applied to the second base fabric portion 12 by a seal applicator 72. Further, during the application process of the adhesive seal 30, the second second base cloth portion 12 is placed on the lower holding surface portion 76a of the work position P2 of the lower table device 76, and the lower holding surface portion 76a is After moving to the press position P1, the upper table device 75 sucks the second second base cloth part 12, and the lower holding surface part 76a returns to the work position P2. And the 1st 1st base fabric part 11 is mounted in the lower holding surface part 76a which returned to the working position P2.

  Then, after the application process of the adhesive seal 30 on the first second base cloth portion 12 is completed, the upper holding surface portions 75a and 75a of the upper table device 75 are rotated to rotate the second second base fabric portion 12. The process of applying the adhesive seal 30 on the second second base cloth part 12 is started with the inner surface of the cloth part 12 facing upward. During this coating process, the lower holding surface portion 76a moves to the press position P1, and the first base fabric portion 11 is pressed against the second base fabric portion 12 to which the adhesive seal 30 has been applied, so that a predetermined dimension is obtained. For example, as shown in the above embodiment, pressing is performed so that the thickness of the space is 1.5 mm. Thereafter, the upper holding surface portion 75a releases the suction of the first second base fabric portion 12 and opens, and the lower holding surface portion 76a moves to the working position P2, and the first base fabric portion 11 and the second base fabric portion 11 The semi-finished product in a state where the base fabric portion 12 is bonded with the adhesive seal 30 is conveyed to a molding step or a curing step of the next step by a manual operation or a conveying device (not shown).

  Further, the process is continuously executed so that the third holding base part 12 and the second first base cloth part 11 are sequentially conveyed by the lower holding surface part 76a.

  In addition, a tool 42 that presses the preliminary application part 40 to form the non-application part 33 can be incorporated in the manufacturing apparatus 71.

  In addition, the manufacturing apparatus 71 can be provided with a seal applicator 72 that can apply two adhesive seals 30 simultaneously. As shown in FIG. 8, the seal applicator 72 includes a first metering pump 81 for supplying a main agent and a second metering pump 82 for supplying a curing agent, and is discharged from these metering pumps 81 and 82. The main agent and the curing agent are mixed in a vertically arranged tube body 84 called an aftermixer to form an adhesive seal 30. A head portion 86 having two nozzles 85 and 85 at a predetermined interval is provided at the distal end portion of the tube body 84. Further, the head portion 86 is provided with a uniaxial motor 87, and a portion provided with two nozzles 85, 85 can be rotated coaxially with the tube body 84.

  Therefore, in this seal applicator 72, for example, the seal applicator 72 is moved relatively horizontally with respect to the second base cloth portion 12, and the nozzles 85 and 85 are rotated and the nozzles 85 and 85 are bonded. By discharging the seal 30, two adhesive seals 30 can be applied simultaneously at a constant interval, that is, two application portions 31 and one non-application portion 33 can be easily formed. A certain amount is supplied from the nozzle while mixing the main agent and the curing agent.

  Further, in each of the above-described embodiments, two application portions 31 and one non-application portion 33 are provided. However, the present invention is not limited to this configuration, and there are a plurality of application portions 31 such as three or four or more. It is also possible to form the sewing portion 37 by forming the plurality of non-application portions 33 that are formed in parallel and set between the application portions 31 respectively. In this configuration, the base fabric portions 11 and 12 can be bonded to each other at the joint portions 14 and 15 more firmly and reliably by the combination of the plurality of application portions 31 and the sewing portion 37.

  Further, in each of the above embodiments, a so-called curtain airbag that is provided in a side portion of a vehicle compartment and covers a window or the like has been described. However, the present invention is not limited to this configuration and is provided in a vehicle or a moving body other than a vehicle. The present invention can be applied to the airbags of various airbag devices.

  In the above embodiment, a manufacturing apparatus that is an automatic machine is used. However, the present invention is not limited to this configuration, and the seal application process, the seal bonding process, the molding process, the sewing process, and the like are performed by an automatic machine process and a manual operation. Can be combined with the process.

  The present invention can be applied to, for example, an airbag that is provided on a side portion of a passenger compartment of an automobile and that inflates and deploys to protect an occupant when the automobile collides.

1 Airbag
11 First base fabric
12 Second base fabric
15 Inner joint as joint
16 air chamber
17 Expansion part
30 Adhesive seal
31 Application part
33 Unapplied part
35, 36 yarn
37 Sewing part
40 Pre-application area
48 steps
51 Sewing machine as sewing device
52 Sewing needle
56 Guide section

Claims (5)

A method of manufacturing an airbag in which the overlapped base fabric portions are joined in a linear manner at a joint portion bonded and sewn,
Between the base fabric portions, two strips of application portions to which an adhesive seal is applied, and a non-application portion having a predetermined width dimension that is located between the application portions and to which the adhesive seal is not applied are formed.
A method for manufacturing an airbag, comprising: using a sewing device provided with a sewing needle, and sewing a base fabric portion with a thread along the non-application portion to form a sewing portion. The method for manufacturing an airbag according to claim 1, wherein the sewing device includes a guide portion that slides in contact with a step portion generated by a difference in thickness between the application portion and the non-application portion and guides the sewing needle. A single pre-applied part to which an adhesive seal is applied is formed, the central part in the width direction of the pre-applied part is pressed along the longitudinal direction, and the non-applied part is removed by eliminating the adhesive seal between the base fabric parts. It forms. The manufacturing method of the airbag of Claim 1 or 2 characterized by the above-mentioned. The method for manufacturing an airbag according to claim 1 or 2, wherein two coated portions are formed at a constant interval, and a portion between the coated portions is a non-coated portion. An inflating portion constituting an air chamber in which gas is supplied and inflated between the overlapped base fabric portions;
It comprises a linear joining part that joins the base fabric parts located in this expanding part,
The joint part includes two application parts in which an adhesive seal is applied between the base cloth parts, a non-application part having a fixed width dimension that is located between the application parts and the adhesive seal is not applied, and the above An airbag comprising: a sewn portion in which base fabric portions are sewn together.

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