JP4114263B2 - Method and apparatus for forming gathers on sheet material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for forming gathers on a sheet material used as an interior material such as a door trim of an automobile or an exterior material of furniture.
[0002]
[Prior art]
Gather formation in this type of sheet material is performed by sewing a sheet material cut to a predetermined size so as not to stretch while being squeezed along the edge by hand.
[0003]
[Problems to be solved by the invention]
However, such a gathering method according to the prior art is different in quality depending on the type of sheet material, the condition of the sewing machine, the environmental conditions such as temperature and humidity, the skill level of the worker and the wrinkles, especially for high-grade sheets. In the case of genuine leather, which is preferred as a material, there is a large variation in the characteristics of the material, so the variation in quality also increases. Further, the sewing work is a manual work and requires considerable skill and labor, which has been a factor in increasing costs. The present invention aims to solve such problems.
[0004]
[Means for Solving the Problems]
In the method of forming a gather on a sheet material according to the present invention, the sheet material is placed on the one side surface of the main jig having a plurality of groove portions formed on one side surface, and a plurality of push bars of the push jig are attached to the main jig. By inserting the sheet material into the groove portion from a side surface side, the sheet material is drawn into the groove portion from a direction orthogonal to the groove portion, and a holding film is stacked on the sheet material, and then placed on one side surface of the main jig. The sheet material and the holding film are pressed to each other at a portion excluding the groove portion by pressing with a pressing mold moving toward the surface, and then the push bar is provided in each groove portion in a state where the push bar is detached from the groove portion. The sheet material and the holding film drawn into each groove by a movable block that moves toward the pressing mold are pressed against the pressing mold to bond them together. Than is. The sheet material drawn into each groove is pressed by a movable block that moves toward the pressing mold in the groove, so that it is compressed in a direction perpendicular to the groove and is irregularly folded and bonded to the holding film. Will not extend from the folded state.
[0005]
In the invention of the preceding paragraph, the sheet material is preferably bonded to the holding film by the movable block at both ends of the groove.
[0006]
In the inventions of the preceding two paragraphs, it is preferable to use a heated pressing mold and a hot-melt adhesive for each bonding.
[0007]
An apparatus for forming a gather on a sheet material according to the present invention is placed on the one side by entering a main jig having a plurality of grooves on one side and entering each groove from the one side. A pressing jig having a plurality of pressing bars for pulling the sheet material into each groove portion from a direction orthogonal to the groove portion, and the sheet material provided on the side surface of the main jig so as to be close to and separated from the side surface. A pressing die that presses the holding film against the one side surface and adheres the two in a portion excluding the groove portion, and the pressing die that is provided in the groove portion of the main jig so as to approach and separate from the pressing die. It consists of a movable block which presses the said sheet | seat material and said holding | maintenance film drawn in in each said groove part by the movement which goes to the said press type | mold, and adhere | attaches these both. The sheet material drawn into each groove by the pushing bar of the pushing jig is orthogonal to the groove by being pressed by a movable block that moves forward in the groove toward the pressing mold in a state where the pushing bar is detached from the groove. The sheet is pressed and shrunk in an irregular direction, and is irregularly folded, and is not stretched from the folded state by being bonded to the holding film.
[0008]
It is preferable that the movable block of the invention of the preceding item is one that adheres the sheet material to the holding film at both ends of the groove.
[0009]
The push bar according to the inventions of the preceding two paragraphs may move substantially parallel to the groove portion to push the sheet material into each groove portion, or swings against the groove portion to push the sheet material into each groove portion. It is good. In addition, it is preferable that the pressing molds of the inventions of the preceding two items and the respective items are heated so that the sheet material and the holding film are heat-sealed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6 show a first embodiment of a method and apparatus for forming a gather on a sheet material according to the present invention. The apparatus of this embodiment is attached to a main jig A attached to a lower fixed support member (not shown) and an upper movable support member (not shown) as shown in FIGS. It consists of the pressing die 20 and the pressing jig B, whereby a gather sheet C as shown in FIGS. 5 and 6 is formed.
[0011]
First, the main jig A will be described mainly with reference to FIGS. A plurality of fixing blocks 11 and 12 are fixed on the base 10 of the main jig A via round support bars 13. Each of the fixed blocks 11 and 12 has the same length (left and right direction in FIG. 2) and thickness, but the horizontal width of the fixed blocks 11 at both ends is larger than the six fixed blocks 12 at the middle ( (See FIG. 1). The upper surfaces of the fixed blocks 11 and 12 are arranged on one plane, and a groove portion 14 having a constant width is formed between them.
[0012]
The elevating member 15 having substantially the same plane shape as the base 10 is provided with a number of holes 15a through which the support rods 13 of the fixed blocks 11 and 12 are slidable. Thus, in the assembled state shown in the figure, the elevating member 15 can be moved up and down between a position contacting the upper surface of the base 10 and a position contacting the bottom surface of each of the fixed blocks 11 and 12 (see arrow Y in FIGS. 1 and 2). On the upper side of the elevating member 15, seven elongated protrusions 16 that are slidably inserted into the respective groove portions 14 between the fixed blocks 11 and 12 are formed. A rod 17 is slidably provided in a guide hole 16a penetrating both ends (see FIG. 2) of each protrusion 16 in the vertical direction, and slidably provided in the groove 14 at the upper end of each rod 17. Both ends of the elongated movable block 18 are fixed. A spring 19 that winds the rod 17 is interposed between the protruding portion 16 and the movable block 18, so that the rod 17 and the movable block 18 have a head at the lower end of the rod 17 in the illustrated free state where no external force is applied. The portion 17a is biased to the raised position where it is engaged with the lower portion of the elevating member 15. In the illustrated embodiment, as shown in FIG. 1, the rising positions of the movable blocks 18 in this free state are higher on the left three than on the right four. The elevating member 15 is moved up and down by an operating device (not shown), whereby the movable block 18 is moved closer to and away from the lower surface of the pressing mold 20 described later.
[0013]
Next, the pushing jig B will be described with reference to FIGS. The fixed side plate 30 of the pushing jig B is an elongated rectangle, and the base ends of seven pushing bars 31 arranged in parallel at the same pitch as the grooves 14 of the main jig A are fixed by welding. As shown in FIGS. 1 and 3, each push bar 31 is disposed with a step corresponding to the difference in height of the movable block 18 described above. The presser side plate 32 has seven insertion holes 32a into which the tips of the chamfered push bars 31 can be inserted and removed.
[0014]
The pressing die 20 can be approached and separated from the upper side of the main jig A. FIGS. 1, 2, 4A and 4B show the state where the pressing die 20 is separated, and FIG. ) And FIG. 4 (d) show the closest approach. The lower surface of the pressing die 20 is a plane corresponding to the upper surfaces of the fixed blocks 11 and 12 of the base 10. The pressing die 20 of this embodiment is heated to the extent necessary for bonding with a hot-melt adhesive described below.
[0015]
The sheet material 40 used in this embodiment is a flexible sheet made of genuine leather, woven fabric, synthetic leather or the like. The holding film 41 is obtained by applying a hot-melt adhesive (for example, a hot-melt sheet having a melting point of 80 to 120 ° C.) to the back surface of a thin polyurethane sheet or polyester sheet. The holding film 41 of this embodiment has a contour shape substantially the same as that of the sheet material 40, and has a large opening 41a except for the outer peripheral portion. The holding film 41 has a strength sufficient to hold the folded portion 42 for forming the gathers so as not to extend after the gather sheet C is formed. May be.
[0016]
Next, a method of forming a gather on the sheet material 40 according to the first embodiment will be described mainly with reference to FIG. First, as shown in FIG. 4A, the sheet material 40 is placed on the main jig A so that the surface thereof is on the side of the fixed blocks 11 and 12, and then the push bar 31 is moved as shown in FIG. The pushing jig B whose tip is inserted into the holding side plate 32 is brought close to the main jig A, and the pushing bars 31 are inserted into the grooves 14 from the upper side of the main jig A as shown in FIG. As a result, the sheet material 40 slides as shown by an arrow X, and is drawn into each groove portion 14 from a direction orthogonal to the groove portions 14. In order to perform this retraction smoothly, the pushing jig B is inclined, and as shown in FIG. 4 (b), first, the pushing bar 31 on one end side is inserted until it hits the movable block 18 in the corresponding groove portion 14, and then It is preferable to insert each push bar 31 into the corresponding groove portion 14 in order from one end side by eliminating the inclination of the push jig B. In this embodiment, the pushing bar 31 is inserted into the groove portion 14 manually. However, depending on the material and structure of the push bar 31 and the sheet material 40, it is possible to insert all the push bars 31 into the groove portion 14 at the same time.
[0017]
When each pushing bar 31 of the pushing jig B comes into contact with the movable block 18 in the corresponding groove portion 14, the holding film 41 is flat on the sheet material 40 riding on the upper surfaces of the fixed blocks 11 and 12. Overlapping as it is. Next, the heated pressing die 20 is brought close to the main jig A, the sheet material 40 and the holding film 41 are sandwiched and pressed between the lower surface of the pressing die 20 and the upper surfaces of the fixed blocks 11 and 12, so that the groove portion 14 is formed. The sheet material 40 and the holding film 41 are bonded to each other except the portion (see FIG. 4C).
[0018]
Then, after the push bar 31 is pulled out in the horizontal direction together with the fixed side plate 30 to be separated from the inside of the groove portion 14, as shown in FIG. The movable block 18 rising toward the pressing mold 20 together with the elevating member 15 presses and compresses the sheet material 40 drawn into each groove portion 14 in a direction orthogonal to the groove portions 14 and then folds the sheet material 40 irregularly. Bonding with a hot-melt adhesive. In this embodiment, the height of the movable block 18 differs between the three on the left side and the four on the right side, and the folding portion 42 in each groove portion 14 has a slight difference in thickness. Although there are differences in the amount of movement, these differences are absorbed by the spring 19. Since the sheet material 40 drawn into each groove portion 14 is not restrained at all in a state in which the push bar 31 is detached, the folding is performed irregularly and is different for each groove portion 14.
[0019]
When the pressing die 20 is raised when the bonding is completed and the sheet material 40 and the holding film 41 are taken out, the folded portion 42 of the sheet material 40 formed in each groove portion 14 is bonded to the holding film 41 and folded. Since it does not stretch, a gather sheet C as shown in FIGS. 5 and 6 is obtained. Since the folding of the sheet material 40 for forming the gathers is performed by the operation of the movable block 18 provided in the groove portion 14, manual operation by a skilled worker is not required, and in the direction orthogonal to the groove portion 14. Since the degree of pressing and shrinking of the sheet material 40 is a predetermined level, the quality is also stable. Furthermore, since the folding of the sheet material 40 by the movable block 18 is performed irregularly, the gathers to be formed differ from place to place and are rich in texture.
[0020]
The gather sheet C obtained by the first embodiment is provided with an opening 41a in the holding film 41, and the sheet material 40 drawn into the groove portion 14 is bonded to the holding film 41 only at both ends to be folded. As shown in FIGS. 5 and 6, the intermediate portion except for both edge portions of the sheet material 40 is not bonded to the holding film 41, and a flexible and large gather different from both edge portions is formed as shown in FIGS. 5 and 6. It is formed. In the state where it is taken out from the main jig A, the folding part 42 is restored in the thickness direction to have a shape as shown in FIG.
[0021]
In this embodiment, since the four movable blocks 18 on the right side are lower in height than the three on the left side in the free state, the degree of compression of the folding portion 42 and the resulting gather The degree of is also increased. Thereby, the texture of gathers can be changed depending on the place or as a whole. Such a change in gather texture can also be performed by changing the widths of the fixed block 12 and the groove portion 14.
[0022]
Next, a second embodiment will be described with reference to FIG. This embodiment is different from the first embodiment only in that the pushing bar 37 of the pushing jig B is swung, and the holding film 41 without the opening 41a is used. In the following description, only this difference will be mainly described.
[0023]
As shown in FIG. 7, swing-type pushing jigs B are provided on both sides of the main jig A which is substantially the same as that of the first embodiment. The rotation block 35 of the pushing jig B is rotated by an actuating device about a shaft 36 provided on a fixed portion (base 10 and fixed blocks 11, 12) of the main jig A. The pushing bar 37 to which the base end portion is fixed extends in a direction orthogonal to the shaft 36. As the left and right pivot blocks 35 pivot inward, each push bar 37 swings and is inserted into the corresponding half of the groove 14 from above and detached upward. As in the case of the first embodiment, the sheet material 40 placed on the fixed blocks 11 and 12 is drawn into the respective groove portions 14 by the push bar 37.
[0024]
The left and right push bars 37 are respectively provided corresponding to the respective groove portions 14, and in the same way as in the first embodiment, in order to smoothly draw the sheet material 40 into the groove portions 14, the central groove portions are provided. It is preferable that the push bar 37 corresponding to 14 is first inserted into the groove portion 14, and the push bar 37 is inserted into each corresponding groove portion 14 with a delay in order toward the outer side. However, depending on the material and structure of the push bar 37 and the sheet material 40, it is possible to insert all the push bars 37 into the groove portion 14 at the same time. The pushing bar 37 of the pushing jig B of the second embodiment is easy to automate because it rotates around the shaft 36 provided at the fixed portion of the main jig A. Therefore, it is suitable for mass production.
[0025]
In the second embodiment, the sheet material 40 placed on the fixed blocks 11 and 12 of the main jig A is moved into the groove portion 14 by swinging the push bar 37 of the push jig B. Then, it is drawn into each groove portion 14 from a direction orthogonal to the groove portions 14. Next, after the pushing bar 37 is swung upward and separated from the inside of the groove portion 14, the holding film 41 is overlaid on the sheet material 40 in a flat state and heated as in the case of the first embodiment. The pressed die 20 is brought close to the main jig A, and the sheet material 40 and the holding film 41 are bonded at a portion excluding the groove portion 14.
[0026]
And the raising / lowering member 15 is raised with an actuator, and the sheet | seat material 40 drawn in in each groove part 14 is compressed in the direction orthogonal to the groove part 14, and is folded irregularly like the case of 1st Embodiment. Is pressed against the holding film 41 and bonded with a hot-melt adhesive. When the bonding is completed, the pressing die 20 is raised, and the gather sheet C to which the sheet material 40 and the holding film 41 are bonded is taken out.
[0027]
In the second embodiment, since the opening 41a is not provided in the holding film 41, the obtained gather sheet C has the sheet material 40 and the holding film 41 over the entire length of the portion corresponding to the fixed blocks 11 and 12. The parts corresponding to the grooves 14 are formed with relatively fine gathers having the same texture over the entire length.
[0028]
Even in the second embodiment, if the recess 18a is provided in the intermediate portion excluding both ends of the movable block 18, the sheet material 40 is not adhered to the holding film 41 in the recess 18a. A flexible and large gather different from both edge portions is formed in an intermediate portion of a portion corresponding to 14. Further, if the concave portion 21 having the contour shape corresponding to the opening 41 a of the holding film 41 of the first embodiment is formed on the lower surface of the pressing mold 20, the sheet material 40 is bonded to the holding film 41 in the concave portion 21. Therefore, the gather sheet C in which only the peripheral portion of the sheet material 40 is bonded to the holding film 41 is obtained, which is the same as that obtained in the first embodiment. Further, the same gather sheet C can be obtained even if the adhesive is applied not to the entire surface of the holding film 41 but only to the outside of the contour shape corresponding to the opening 41a of the holding film 41 of the first embodiment.
[0029]
In the second embodiment, the pushing bar 37 of the pushing jig B is inserted into and detached from the groove portion 14 only by swinging. However, each pushing jig B is disposed on both sides of the main jig A. The push bar 37 is inserted into the groove portion 14 in the same manner as described above with the push jig B approached, and the push bar 37 is removed from the groove portion 14 by retracting the push jig B. You may be made to do by. In this way, as in the case of the first embodiment, after the sheet material 40 and the holding film 41 are bonded to each other except the groove portion 14 by the heated pressing die 20, the pressing bar 37 is pulled out in the lateral direction. Can be separated from the inside of the groove portion 14. According to this modification, in addition to all the effects of the second embodiment, the certainty of adhesion between the sheet material 40 and the holding film 41 in the portion excluding the groove portion 14 is enhanced.
[0030]
When the concave portion 21 is formed on the lower surface of the pressing mold 20 as described above, a cover pad made of a flexible foam sheet having a contour shape corresponding to the concave portion 21 is interposed between the sheet material 40 and the holding film 41. The levers 40 and 41 can be bonded to each other, so that a gather sheet having a cover pad on the back surface of the sheet material 40 can be obtained.
[0031]
In each of the above-described embodiments, the holding film 41 is provided with a hot-melt adhesive or a hot-melt sheet. However, the present invention is implemented by applying a hot-melt adhesive to the back surface of the sheet material 40. May be. In this case, since the sheet members 40 are also bonded to each other at the folding part 42, even if the sheet material 40 is taken out from the main jig A, the folding part 42 is not restored in the thickness direction as shown in FIG.
[0032]
Further, in each of the above-described embodiments, a bonding method using a hot-melt adhesive is adopted, and according to this, the time required for one gather formation can be shortened, and the manufacturing cost of gathers can be further reduced. However, the present invention can also be implemented by other bonding methods.
[0033]
The gather sheet formed as described above can be used by being mounted on a base material such as a door trim through a separate pad, or urethane or the like set on a foam mold and supplied to the back side. It can also be used as an assembly in which the foam is integrally formed by foaming the foam material. In the latter case, in order to prevent the foam material impregnated on the back surface of the sheet material from being cured, a gather sheet (for example, the second embodiment described above) provided with the holding film 41 on the entire back surface of the sheet material 40 is used. It is preferable to use those obtained in (1).
[0034]
【The invention's effect】
As described above, according to the method and apparatus for forming a gather in the sheet material of the present invention, the sheet material drawn into each groove is irregularly folded and bonded to the holding film so that it does not stretch. Become. In addition, the irregular folding of the sheet material for forming the gathers is performed by the operation of the movable block provided in the groove, so that a gather with stable quality can be formed at a low manufacturing cost without requiring skill.
[0035]
In the invention of the preceding paragraph, according to what the sheet material is bonded to the holding film at both ends of the groove portion, the intermediate portion excluding both edge portions of the sheet material is not bonded to the holding film. Different flexible gathers are formed.
[0036]
In the inventions of the preceding two paragraphs, according to the use of a heated pressing die and a hot melt adhesive, the time required for one gathering can be shortened, and the production cost of gathers can be further reduced. Can do.
[0037]
In the apparatus for forming gathers on the sheet material according to the present invention, the structure in which the push bar is moved substantially parallel to the groove portion is suitable for small-scale production because the structure of the push jig is simplified. . In addition, the one that swings with respect to the groove is easy to automate and is suitable for mass production.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view showing a first embodiment of a method and apparatus for forming gathers on a sheet material according to the present invention.
2 is a cross-sectional view taken along the line 2-2 in FIG.
FIG. 3 is a perspective view of a pushing jig used in the first embodiment.
FIG. 4 is a partially enlarged cross-sectional view for explaining the operation of the first embodiment.
5 is a partially enlarged sectional view corresponding to FIG. 4 of a gather sheet manufactured according to the present invention.
6 is a cross-sectional view taken along the line 6-6 in FIG.
FIG. 7 is a cross-sectional view corresponding to FIG. 2 of a second embodiment of a method and apparatus for forming gathers on a sheet material according to the present invention.
[Explanation of symbols]
A ... main jig, B ... pushing jig, 14 ... groove, 18 ... movable block, 20 ... pressing mold, 31, 37 ... pushing bar, 40 ... sheet material, 41 ... holding film.

Claims (8)

By placing a sheet material on the one side surface of the main jig having a plurality of groove portions formed on one side surface, and inserting a plurality of pushing bars of the pushing jig into the groove portions from one side surface of the main jig. The sheet material is pulled into the groove portions from a direction orthogonal to the groove portions, and is pressed by a pressing mold that moves toward one side of the main jig after a holding film is overlaid on the sheet material. And the holding film are bonded to each other in the portion excluding the groove portion, and then the movable bar is provided in each groove portion and moves toward the pressing mold in a state where the push bar is detached from the groove portion. A method of forming gathers on a sheet material, wherein the sheet material and the holding film drawn in are pressed against the pressing mold and bonded together. The method for forming a gather on a sheet material according to claim 1, wherein the sheet material is bonded to the holding film by the movable block at both end portions in the groove portion. The method for forming gathers on a sheet material according to claim 1 or 2, wherein the pressing mold is a heated one, and a hot-melt adhesive is used for each bonding. A main jig in which a plurality of groove portions are formed on one side surface, and a sheet material placed on the one side surface by entering the groove portion from the one side surface side in each groove portion from a direction orthogonal to the groove portion. A pressing jig having a plurality of pressing bars to be pulled into the main jig, and the sheet material and the holding film stacked thereon are pressed against the one side surface of the main jig to press the groove portion. A pressing die that adheres both of them in the removed portion, and the sheet material that is provided in the groove portion of the main jig so as to approach and separate from the pressing die and is drawn into each groove portion by moving toward the pressing die. And an apparatus for forming a gather on a sheet material, comprising a movable block that presses the holding film against the pressing mold and adheres the two. The said movable block is an apparatus which forms gathers in the sheet | seat material of Claim 4 which adheres the said sheet | seat material with respect to the said holding | maintenance film in the both ends of the said groove part. 6. The apparatus for forming a gather on a sheet material according to claim 4, wherein the push bar moves substantially parallel to the groove portion to push the sheet material into each groove portion. 6. The apparatus for forming a gather on a sheet material according to claim 4, wherein the push bar swings with respect to the groove portion and pushes the sheet material into each groove portion. The apparatus for forming a gather on a sheet material according to any one of claims 4 to 7, wherein the pressing mold is heated so as to heat-bond the sheet material and the holding film.

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