JPS6217530B2 - - Google Patents

Abstract

PURPOSE:To permit welding without causing wrinkles, folded welding and missed welding by an apparatus wherein a plurality of sheets placed one upon another are passed between a rotary roller having a number of pressed bosses over the entire surface and a plurality of ultrasonic vibrators axially arrayed in a special fashion. CONSTITUTION:A plurality of ultrasonic vibrators 3 are axially arrayed along the roll surface of a rotary roll 2 having a number of pressed bosses thereon, and a number of sheet-like materials 4, 5 placed one above another are inserted for transfer between an action surface 3a of the vibrators 3 and the pressed bosses 1 of the roll 2. Then, the sheet-like materials are jointed with to each other by ultrasonic welding. At this time, the plurality of ultrasonic vibrators 3 are aligned with minute gaps 6 therebetween, and the action surface 3a of each vibrator 3 is so formed that sides 3b, 3c opposite to each other with the minute gap make an oblique angle alpha (preferably 70 deg.) relative to the axial direction of the roll 2. By so doing, it becomes possible to prevent wrinkles, loosening and folded welding resulted therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of the invention described in Japanese Patent Publication No. 52-28846.

A plurality of ultrasonic transducers are arranged in the axial direction along the roll surface of a rotating roll with embossing protrusions on the roll surface, and two or more sheet-like materials stacked one on top of the other are connected to the rotating roll and the ultrasonic transducer. The apparatus described in the above-mentioned patent publication is described in the above-mentioned patent publication. There are drawbacks.

When multiple ultrasonic transducers are arranged in a row with a little distance between them so as not to cause resonance, the parts between them are not affected by spot welding, so linear welding can be performed on the joined sheet-like objects. A deficiency appears.
In order to prevent such welding missing lines from occurring, in the apparatus described in the above publication, a plurality of ultrasonic transducers are arranged in two rows, shifted in the length direction of the sheet-like object every other time. The entire width can be covered by the action surface of the ultrasonic transducer. Although this method was able to prevent the appearance of missing weld lines, the following new drawbacks occurred.

That is, when the stacked sheets reach the first row of ultrasonic transducers and are welded, the parts of the sheets that are not subjected to the welding action between each transducer are wrinkled and become overlapped. It is. When this overlapped part is subjected to the action of the second row of ultrasonic transducers, this part is welded while being pressed against the edge of the part that has already been welded by the first row of transducers. Folded or seam-like portions appear in the finished sheet-like bonded product, which seriously impairs the appearance of the product.

In order to compensate for this drawback, the invention described in Japanese Patent Publication No. 54-2234 has been proposed. This is because the ultrasonic transducers are arranged in two rows, and the first row
A pressing member that engages with the sheet-like material is provided between each vibrator in the row along the length direction of the row, thereby pressing the sheet-like material to prevent bagging. However, in this method, since the pressure welding member is arranged so as not to come into contact with the vibrator, it is unavoidable that small wrinkles form in the distant part, and the wrinkles are welded into a folded shape by the second row of vibrators. Therefore, it was not possible to completely prevent damage to the appearance of the sheet-like bonded product. Furthermore, since a pressure contact member is provided, the mechanism of the welding section is complicated.

In view of this point, the present invention has been developed to prevent the occurrence of baggy sheet-like materials and folded welding during welding, as well as to prevent the occurrence of missing weld lines, without providing the above-mentioned pressure welding member. A sonic vibration welding device is provided.

Hereinafter, an explanation will be given with reference to figures of examples. Figure 1,
FIG. 2 shows the entire apparatus of the present invention, and FIGS. 3 to 6 show the ultrasonic transducer used in the apparatus of the present invention. As shown in the figure, in the present invention, a plurality of ultrasonic transducers 3 are disposed in the axial direction along the roll surface of a rotary roll 2 having embossing protrusions 1 disposed on the roll surface, and two or more ultrasonic transducers 3 are superimposed. The sheet-like materials 4 and 5 are inserted and transferred in a press-contact manner between the working surface 3a of the ultrasonic vibrator 3 and the embossing protrusion 1 of the roll 2, and the sheet-like materials are joined by ultrasonic vibration welding. In the apparatus, a plurality of ultrasonic transducers 3 are arranged in a row with a minute interval 6, and the shape of the working surface 3a of each ultrasonic transducer 3 is changed to sides 3b, 3 facing each other with the minute interval.
c is formed at an oblique angle α with respect to the axial direction of the roll 2, and the oblique angle α is preferably about 70°.

In FIGS. 3 to 6, reference numeral 7 indicates a screw hole for connecting the vibrator to the ultrasonic generator, and reference numeral 8 indicates a through hole provided to uniformly transmit vibrations to the working surface of the vibrator.

The two sheet-like materials 4 and 5 are superimposed and sent, and as they pass between the ultrasonic vibrator 3 and the embossing protrusion 1 of the roll, they are welded in spots over the entire width. At this time, in the present invention, a plurality of ultrasonic transducers 3 are arranged in a row with a minute interval 6, and the sides 3b and 3c of their working surfaces facing each other with a minute interval are in the axial direction of the roll 2. oblique angle α
Because it is configured to do
- The drawbacks of the No. 28846 invention, such as wrinkling and bagging of the sheet-like material and resulting folded welding caused by arranging the ultrasonic transducers in two rows, do not occur at all. Furthermore, the installation of a pressure welding member in the invention of Japanese Patent Publication No. 54-2234, which was adopted to eliminate the above-mentioned drawback, but which could not be said to be completely eliminated, is completely unnecessary in the present invention, and therefore the welding effect is improved. The mechanism of the section has become significantly simpler.

Furthermore, in the present invention, although a plurality of ultrasonic transducers are arranged in a row, the intervals between the working surfaces of each transducer are minute, and the sides facing each other with the interval are relative to the axial direction of the roll. Since the working surface is obliquely angled, the working surface can cover substantially the entire width of the moving sheet-like object, and no weld missing lines will occur. In order to prevent missing welds, it is desirable that the bevel angle be as acute as possible, but a bevel angle of about 70° is advantageous because it allows the vibration to be transmitted almost uniformly to the four corners of the working surface of the ultrasonic vibrator. .

[Brief explanation of the drawing]

FIG. 1 is a plan view of the apparatus of the present invention, and FIG. 2 is a side view thereof. Figures 3 to 6 show the ultrasonic transducer used in the device of the present invention, with Figure 3 being a plan view and Figure 4 being a top view.
The figure is a bottom view, Figure 5 is a front view, and Figure 6 is a front view.
-A section sectional view. DESCRIPTION OF SYMBOLS 1... Embossed projection, 2... Roll, 3... Ultrasonic transducer, 3a... Working surface, 3b, 3c... Side, 4, 5... Sheet-like material, 6... Minute interval.

Claims (1)

[Scope of Claims] 1 A plurality of ultrasonic transducers are arranged in the axial direction along the roll surface of a rotary roll having embossing protrusions arranged on the roll surface, and a sheet-like material made by overlapping two or more sheets. In an apparatus for joining sheet-like objects by ultrasonic vibration welding, a plurality of ultrasonic vibrators are inserted at minute intervals between the working surface of the ultrasonic vibrator and the embossing protrusion of a roll, and the sheet-like objects are transferred by being inserted in a press-contact manner. The ultrasonic transducers are arranged in a row with a gap between them, and the shape of the working surface of each ultrasonic vibrator is formed such that the sides facing each other with the slight spacing therebetween form an oblique angle with respect to the axial direction of the roll. Ultrasonic vibration welding equipment. 2. The ultrasonic vibration welding device according to claim 1, wherein the oblique angle is approximately 70°.