JPH0513558Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a high-frequency welding device for forming the end of a support member in a vehicle seat (automobile seat) with the aim of reducing thickness and weight. This invention relates to a high-frequency welding device that welds the end of a support member into a bag shape so that it can be stretched over a frame by passing a wire or the like therein.

(Prior art and its problems) As shown in Fig. 5, a cloth-like elastic support member a stretched over a frame d has a thinner sheet than a support member using a metal S-shaped spring or the like. It is known that it can be made lighter and lighter.

By the way, in order to stretch the cloth elastic support member a over the frame d, the left and right ends are formed into bag shapes, the wire b is inserted into the bag, and the wire b is attached to the frame using clips c, c... It is necessary to attach it to d. Conventionally, the ends of the cloth elastic support member are formed into a bag shape by sewing.

Therefore, not only was the workability poor, but the sewing area was pulled by the wire b, and there was a risk of damage. Furthermore, since this support member has elasticity, it has been difficult to form it with a constant width in the left and right direction by sewing.

Note that the frame d on which the support member a is stretched
A foam cushioning material is applied to the foam cushion material, and these are covered with a skin member to assemble a seat (seat bag).

(Means to be Solved by the Invention) Therefore, an object of the present invention is to enable the end portion of the fabric elastic support member to be reliably formed into a bag shape with a simple structure.

The basic structure of the present invention to achieve such an object is a lower electrode having a flat upper surface on which a fabric elastic support member is placed, and a lower electrode that is attached to the lower electrode and folds back the end of the support member. a guide rod, a pressing rod whose one end is attached to a lower electrode or near the lower electrode so as to be rotatable in vertical and horizontal directions by means of a universal joint and presses the support member against the guide rod; High-frequency welding for forming a bag-like end of a fabric elastic support member in a vehicle seat, the end of which is pressed by a pressing rod and an upper electrode is welded to the support member on the lower electrode. It is related to the device.

Therefore, when the supporting member is placed on the lower electrode, a pressing rod is placed on the supporting member, and the pressing rod slides while pressing the surface of the supporting member and presses it against the guide rod, the end of the supporting member is folded back. Then, when this folded end is pressed with the upper electrode toward the supporting member on the lower electrode and high frequency is applied, a supporting member having a bag-shaped end is welded. Note that the supporting member after welding is removed from the open end of the pressing rod.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows a high frequency welding device according to the present invention,
In the figure, 1 is a press rod whose one end is connected to the end of the lower electrode 2 having a planar upper surface by a universal joint 11, and its length is the width of the lower electrode (width in the vertical direction in Figure 1). It is a round bar having a long rigidity, and is mounted so as to be rotatable in the vertical and horizontal directions with the universal joint 11 as a fulcrum.

The lower electrode 2 is an electrode of a high-frequency welding machine, and its upper surface is formed into a planar shape, and square guide rods 4 are provided along both ends of the upper surface in the left and right direction (in the illustrated case, the left end). be. This guide rod 4 is provided with one or more plate spring clamps 5, 5 at predetermined intervals. The pressing rod 1 is connected to the universal joint 11 so as to abut along the guide rod 4. Therefore, when the pressing rod 1 is brought into contact with the guide rod 4, the pressing rod 1 is clamped by the clamps 5, 5 provided on the guide rod 4.

The upper electrode shown at 3 in the figure is located below the upper surface of the lower electrode 2 as shown in FIG. 1 when not welding.
During welding, it is mounted so that it can be rotated as shown by the two-dot chain line in FIG. 2 and placed on the lower electrode 2 to weld the cloth elastic support member a. That is, the upper electrode 3
is rotatably attached to the side wall of the lower electrode 2 via a substantially G-shaped arm 31, and by a stopper 33 provided on the side wall side of the lower electrode 2, the solid line in FIGS. Rotation is restricted to a constant state. In the figure,
Reference numeral 32 denotes a mounting bolt for rotatably attaching the arm 31.

In the illustrated embodiment, the pressing rod 1, the upper electrode 3, the guide rod 4, etc. are provided on one side of the lower electrode 2, but in reality, these are provided on both the left and right sides.

The cloth elastic support member a is, for example, a fabric that expands and contracts in the direction in which it is stretched, and has polyester twisted yarns as warp threads.
A woven fabric is used in which monofilament of elastic polyester or elastomer is plain woven into the weft, and the intersections of the weft and weft are heat-sealed to prevent the weft and warp from slipping.

Figures A, B, C, and D show the process of welding bags a2 and a2 to both ends of the support member a in the tensioning direction using the high frequency welding device.
This is explained by:

First, as shown in FIG. 3A, the support member a is placed on the lower electrode a. Then, since this support member a is formed in advance to be longer than the length of the lower electrode a so that both ends can be folded back, the end a3 protrudes outward from the guide rod 4. Therefore, when the pressing rod 1 is placed on the support member a and is slid on the support member a while hitting the guide rod 4, the support member a
One side is held between the guide rod 4 and the pressing rod 1, and the pressing rod 1 is pressed by a clamp 5 provided on the guide rod 4, so that the clamping state of the support member a is maintained. After clamping one side of the support member a in this way, a pressing rod, a guide rod,
Clamp it with a clamp (not shown).

Next, as shown in FIG. 3C, the end a3 of the support member a is folded back, and a vinyl chloride film or the like is high-frequency welded between the inside of the folded part and the support member a on the lower electrode 2. Adhesive piece b1 with excellent properties
insert.

After that, the upper electrode 3 is rotated as shown in FIG.
When pressure is applied and high frequency is applied, the adhesive piece b1 is melted by the high frequency and the end portion a3 is integrally welded to the support member a, forming the bag portion a1. and,
After molding this bag portion a1, when the support member a is taken out from the open end side of the pressing rod 1, a support member a having bag portions a1, a1 at both left and right ends as shown in FIG. 4 is obtained. In FIG. 4, a2 indicates a welded portion.

Therefore, the wire b is inserted through the bag portions a1, a1 of the support member a, and is used by being stretched over the frame d with clips c, c, . . . as shown in FIG.

(Effects) According to the present invention, since the pressing rod whose one end is attached by a universal joint is provided at or near the lower electrode, the surface of the support member placed on the lower electrode is pressed by the pressing rod. It slides while being pressed lightly. Therefore, wrinkles and sagging do not occur in the support member, so that it can be welded and formed to a predetermined width dimension. Furthermore, by arranging the upper electrodes on the left and right sides of the lower electrode, the left and right ends of the support member can be simultaneously welded to form a bag portion, which is much easier to work with than conventional sewing operations. In addition, the structure of the device itself is simple and can be provided at low cost.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view, Figure 2 is an enlarged front view of the main parts, Figure 3 A, B, C, and D are front views showing the molding process, and Figure 4 is the product of the present invention. FIG. 5 is a perspective view of the support member molded using the same support member, and FIG. 5 is a perspective view showing the attached state of the support member. In the figure, 1 is a pressure rod, 2 is a lower electrode, 3 is an upper electrode,
4 is a guide rod, a is a support member, and a3 is an end of the support member.

Claims (1)

[Claims for Utility Model Registration] (1) A lower electrode having a flat upper surface on which a fabric elastic support member is placed, a guide rod attached to the lower electrode and folding back the end of the support member; a pressing rod whose one end is attached to the lower electrode or near the lower electrode so as to be rotatable in vertical and horizontal directions using a universal joint and presses the support member against the guide rod; A high-frequency welding device for forming a bag-like end of a cloth elastic support member in a vehicle seat, the device comprising an upper electrode for welding the end of the support member pressed by the support member to the support member on the lower electrode. (2) High-frequency welding for forming an end of a cloth elastic support member in a vehicle seat according to claim 1, wherein the guide rod is provided with a plate spring clamp for holding the pressure rod together with the support member. Device.