JPH04341294A - Skin joining structure of seat - Google Patents

Abstract

PURPOSE:To prevent the sewing failure, etc., and to easily execute automatization of a process by joining at least one skin of a chemical fiber compound skin and a thermoplastic film skin by ultrasonic welding. CONSTITUTION:On the seat surface of a seat cover for a seat cushion, a chemical fiber compound skin 4 and a thermoplastic film 5 are joined by ultrasonic welding 6. That is, by putting a tool horn of an ultrasonic welding machine and pressing it, the chemical fiber compound skin 4 and the thermoplastic film skin 5 are welded, therefore, they can be joined without using a sewing machine thread, and a failure caused by a thread such as thread breakage, fraying, etc., is eiliminated. Also, a replenishing/changing work of a thread on the way of a sewing work is eliminated, and since the ultrasonic welding machine can set comparatively freely its structure, the process can be automatized easily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat skin bonding structure suitable for use in automobile seats and the like.

0002

[Prior Art] Conventionally, the chemical fiber skin and thermoplastic film skin of automobile seats etc. have been joined by sewing.
This was done by stitching together with thread using a sewing machine.

0003

However, this method requires the use of thread for sewing, and there is a problem in that poor sewing often occurs due to thread breakage, skipped stitches, fraying, etc.

[0004] Furthermore, the timing of replacing and replenishing the thread (particularly in the case of a lockstitch sewing machine, replenishing the bobbin thread) may occur in the middle of the sewing operation, which causes problems in sewing defects. .

[0005] Furthermore, when considering automation of sewing work, there is a problem in that the structure of the sewing machine and the replenishment and replacement of threads are hindered and difficult.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a sheet skin joining structure that does not cause sewing defects and can easily automate the process.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that at least one of the chemical fiber skin and the thermoplastic film skin is joined by ultrasonic welding.

[0008]

[Operation] With the above structure, there is no need to use a sewing machine to sew, thereby eliminating problems caused by threads such as thread breakage and fraying. Furthermore, there is no need to replenish or replace thread during the sewing process. Furthermore, since the structure of an ultrasonic welding machine can be set more freely than a sewing machine, it is easier to automate the process.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 12. For example, in an automobile seat 1 as shown in FIG. 1, a seat cover 2 for a seat back (see FIG. 2) and a seat cover 3 for a seat cushion (see FIG.
reference) is used.

For example, in the seat surface of a seat cover 3 for a seat cushion, a chemical fiber skin 4 and a thermoplastic film skin 5 are joined by ultrasonic welding 6, as shown in FIG. In other words, the chemical fiber skin 4 and the thermoplastic film skin 5 are welded together by applying pressure with the tool horn of an ultrasonic welding machine to the parts that were conventionally sewn together using a sewing machine. Thereby, the chemical fiber skin 4 and the thermoplastic film skin 5 can be joined without using sewing thread.

FIGS. 5 and 6 show the thermoplastic film skin 7,
8 are joined by ultrasonic welding 9 as in the example of FIG. That is, the thermoplastic films 7 and 8 (including wadding and backing fabric) are welded by applying pressure with the tool horn of an ultrasonic welding machine to the parts that were conventionally sewn together using a sewing machine. In FIGS. 5 and 6, 7a and 8a are the front side of the epidermis, and 7b and 8
b is the back side of the epidermis. And 9a is the welded part, a
indicates the middle side of the sheet.

In the examples shown in FIGS. 4 and 5, the welded portion 9a is hardened (
(plasticization) and increases rigidity, causing problems such as the feeling of a foreign body on the seat surface. As a countermeasure to this problem, the rigidity is lowered by making the receiving jig (anvil) 10 of the ultrasonic welding machine uneven (see FIG. 7) or by making the teeth slanted to make the weld discontinuous. 8 and 9 show the appearance of the welded part 9a after welding, and FIG. 8 shows the case where the receiving jig 10 is uneven as shown in FIG. 7, and FIG. 9 shows the case where the teeth of the receiving jig are slanted. Each case is shown below.

FIG. 10 shows the joining of the end portions of the seat cover. That is, a thermoplastic resin plate or film is welded to the end portion of the thermoplastic film skin 11 using an ultrasonic welder to make it harder than other parts of the thermoplastic film skin 11 to form the hardened portion 12.

The purpose of making this end portion hard is to fix the cover end to the seat frame after the seat cover is placed over the cushioning material of the seat. That is, as shown in FIG. 11, a thermoplastic film skin 11 is placed on a cushion material, and a hardened portion 12 is attached to a frame structure material 13 with a hog ring 1.
Stop at 4.

Further, as shown in FIG. 12, after the thermoplastic film skin 11 is wrapped around the cushioning material, the hardened portion 1 is attached to the hook 13a formed on the frame structural material 13.
2 may be hooked into the hole 12a for fixation.

In the embodiments described above, the skin can be joined without using threads, and considering the examples shown in FIGS. 11 and 12, it is possible to join the skins without using threads. Effects such as eliminating the need for metal wires previously used can be obtained.

[0017]

[Effects of the Invention] As described above, the present invention provides the following effects. ■Since there is no need to sew with a sewing machine, problems caused by threads such as thread breaks and fraying are eliminated. ■There is no need to replenish or replace thread during the sewing process. ■The structure of an ultrasonic welding machine can be set relatively freely compared to a sewing machine, making it easier to automate the process. ■In the seat cover skin end treatment, the number of parts is reduced compared to conventional methods. ■When used for tacking parts during the sewing process, tacking thread becomes unnecessary. ■The above basting can be done more easily than sewing with a sewing machine.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an automobile seat according to an embodiment of the present invention.

FIG. 2 is a perspective view of a seat cover for a seat back according to an embodiment of the present invention.

FIG. 3 is a perspective view of a seat cover for a seat cushion according to an embodiment of the present invention.

FIG. 4 is a partially enlarged perspective view of section IV in FIG. 3;

FIG. 5 is a partially enlarged perspective view of the V section in FIG. 3;

FIG. 6 is a perspective view showing a state in which the epidermis is expanded from the state in FIG. 5;

FIG. 7 is a perspective view of a receiving jig according to an embodiment of the present invention.

8 is a perspective view of a welded portion when using the receiving jig shown in FIG. 7; FIG.

9 is a perspective view of a welded portion when a receiving jig different from the receiving jig shown in FIG. 7 is used; FIG.

FIG. 10 is a partially enlarged perspective view of the X section in FIG. 3;

FIG. 11 is a perspective view of a seat cover end processing section according to an embodiment of the present invention.

FIG. 12 is a perspective view of a seat cover end processing section different from that shown in FIG. 11;

[Explanation of symbols]

1 Automotive seat 4 Chemical fiber skin 5, 7, 8, 11 Thermoplastic film skin 6, 9
Ultrasonic welding 12 hardened part

Claims (1)

[Claims] 1. A skin joint structure for a sheet, characterized in that at least one of a chemical fiber skin and a thermoplastic film skin is joined by ultrasonic welding.