JPH0544343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ultrasonic bonding device used to manufacture bags by irradiating superposed sheets with ultrasonic waves and bonding them.

<Prior art> When forming a bag body from a synthetic resin thread mesh-like sheet or paper sheet, etc.
An ultrasonic bonding device is used that irradiates superposed sheets with ultrasonic waves to cause intramolecular vibrations and generate heat to melt and bond the sheets.

FIG. 4 is a plan view of a conventional example of such an ultrasonic bonding device. A guide rail 42 is provided in parallel to the machine frame 41, and an ultrasonic oscillator 43 is connected to the guide rail 42.
It is designed to move back and forth along the At the left end of the ultrasonic oscillator 43 is a horn 4 that emits ultrasonic waves.
4 is attached, and its tip is attached to the clamp plate 45.
It passes through a slide hole in a push-out plate 46 supporting the sheet A and faces the sheet A. Further to the left of the horn 44, a horizontally long pedestal 47 attached to a mounting seat 49 is arranged, and a plurality of adjustment bolts 48 are used to position the pedestal 47 and the horn 44 at a constant distance. It's starting to get adjusted.

This ultrasonic bonding device
is supplied from above the surface of the paper to perform adhesion. As the sheet A is supplied, the extrusion plate 46 advances toward the pedestal 41, and the sheet A is sandwiched between the pedestal 47 and the clamp plate 45 attached to the extrusion plate 46.
Next, the ultrasonic oscillator 43 slides along the guide rail 42, and an adhesive line is formed on the sheet A by the ultrasonic wave from the horn 44.

<Problems to be Solved by the Invention> In such an ultrasonic bonding device, it is necessary to adjust the distance between the horn 44 and the pedestal 47 to 0.1 to 0.2 mm, but it is necessary to adjust all the adjustment bolts 48 uniformly. It is difficult to adjust the position of the pedestal 47, and the position of the pedestal 47 is easily misaligned.
A slope occurs. As a result, when the horn 44 moves back and forth, the tip of the horn 44 slides while contacting the pedestal 47, causing wear of the horn 44. Furthermore, even if the position of the pedestal 47 is properly adjusted, if the surface of the pedestal 47 is uneven, the distance between the horn 44 and the pedestal 47 is small, so the horn 4
4 and the pedestal 47 inevitably come into contact with each other. Therefore, in the conventional device, there was a problem that the horn 44 wore out quickly and had poor durability.

The present invention has been made in consideration of the above circumstances, and provides an ultrasonic bonding device that prevents contact between the horn and the pedestal.

<Means for Solving the Problems> In the ultrasonic bonding device according to the present invention, the horn is brought into contact with the pedestal by reciprocating the pedestal provided corresponding to the horn in synchronization with the reciprocating movement of the horn. It is characterized by preventing

<Examples> The present invention will be specifically described below with reference to illustrative examples. FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a perspective view of its essential parts, and FIG. 3 is a side view of the operating state. A pair of guide rails 2 are arranged in parallel within a machine frame 1 assembled into a rectangular plane. A roller 4 is in rolling contact with each guide rail 2, and the ultrasonic oscillator 3 is supported by the roller 4. Therefore, as the rollers 4 roll, the ultrasonic oscillator 3 moves back and forth along the guide rail 2 in the direction of the arrow. A vibrator (not shown) for performing ultrasonic vibration is installed in the ultrasonic oscillator 3, and a horn 5 connected to the vibrator protrudes from the left end of the harmonic wave generator 3. The horn 5 is formed into a pointed shape, and the amplitude of the vibration from the vibrator is expanded so that ultrasonic waves are emitted from the tip of the horn 5. Further to the left side of the horn 5 is a cradle 6 corresponding to the horn 5.
is installed. This pedestal 6 is located on the opposite side of the seat A, and is formed entirely into a cone shape that tapers toward the horn 5. It is designed to receive ultrasound from 5. The pedestal 6 is attached to the screw rod 7 by a nut 9, and is adjusted to move in the axial direction by an adjustment knob 8 that rotates the screw rod 7, so that it is kept at a constant distance (0.1 to 0.2 mm) from the horn 5. adjusted to maintain the

The ultrasonic oscillator 3 to which the pedestal 6 and the horn 5 are attached is configured to integrally reciprocate in synchronization. To explain this structure with reference to FIG. 2, the ultrasonic oscillator 3 and the pedestal 6 are attached to each tip of a bifurcated connector 10. A translation rod 11 is connected to the connector 10, and the translation rod 11 is connected to a drive means 12 such as a motor or a cylinder. Accordingly, when the drive means 12 is operated, the connector 10 reciprocates via the translation rod 11, so that the ultrasonic oscillator 3 and the pedestal 6 synchronously reciprocate as one unit. Thereby, the pedestal 6 always moves with the horn 5 while facing the horn 5, and receives the ultrasonic waves from the horn 5. With this structure, the pedestal 6 moves back and forth integrally with the horn 5, and the horn does not slide in contact with the surface of the pedestal as in conventional devices, so there is no contact between the horn and the pedestal. As a result, the horn 5 can be prevented from being worn out. In the figure, 13 is an extrusion plate, and a slide hole 14 through which the horn 5 passes is formed in the longitudinal direction. Clamp plates 15 are fixed to the side surface of this extrusion plate 13 above and below the slide hole 14, and fixed clamp plates 16 corresponding to the clamp plates 15 are spanned over the machine frame 1. The clamp plate 15 and the fixed clamp plate 16 are in pressure contact with the sheet A to be bonded from both sides to clamp the sheet A and prevent the sheet A from vibrating or wobbling during bonding. Therefore, in this embodiment, the clamp plate 1
The extrusion plate 13 to which the sheet A is fixed is connected to a pressing means (not shown) such as a motor or cylinder, and slides in the direction of the fixed clamp plate 16 or in the opposite direction to clamp and release the sheet A. I'm starting to do it.

Next, the operation of the above ultrasonic bonding device will be explained with reference to FIG. Before operation, rotate the adjustment knob 8 so that the distance between the pedestal 6 and the horn 5 is 0.1~
Adjust so that it is about 0.2mm. In this adjustment, only the single adjustment knob 8 is rotated, so that the adjustment work can be performed extremely easily and accurately. After the adjustment is completed, the switch is turned “ON” and the ultrasonic oscillator 3 starts operating.
Clamp plate 15 with sheets A stacked on top of each other
and the fixed clamp plate 16. In addition,
In this case, the sheet A has been previously glued together at both edges by passing through a separate ultrasonic bonding device. When the sheet A is fed for a predetermined length, the extrusion plate 13 slides and clamps the sheet A between the clamp plate 15 and the fixed clamp plate 16. In this state, the driving means 12 operates, and the ultrasonic oscillator 3
and the pedestal 6 move together, and the sheets A are bonded together by ultrasonic waves from the horn 5. In such an adhesion operation, the horn 5 and the pedestal 6 operate integrally, and the horn 5 and the pedestal 6 do not come into contact with each other, so that wear of the horn 5 is prevented. In addition, in this bonding operation, an adhesive seal line and a cutting line are simultaneously formed by ultrasonic irradiation, and the stacked sheets A are bonded together to form a bag body, and are cut into individual bag bodies. separated. When the ultrasonic oscillator 3 and the cradle 6 reach the end of their movement indicated by the broken line in FIG. 1, the pedestal 13 moves back and the clamp on the sheet A is released. As a result, the formed bag body falls downward, and then the next stage sheet A is supplied for a predetermined length, and the clamp plate 15 and fixed clamp plate 1
6, and the ultrasonic oscillator 3 and the pedestal 6 move in the opposite direction as one. Then, during this reverse movement, adhesion and cutting are performed simultaneously, and thereafter, the same repeated operations are performed to continuously manufacture bags.

Note that various modifications can be made to the present invention. The ultrasonic oscillator and the pedestal may be attached to separate drive means and moved synchronously by controlling the drive means. Alternatively, the sheet may be clamped by sliding both clamp plates. Furthermore, the ultrasonic bonding apparatus of the present invention can be applied not only to the production of bags but also to the production of other molded bodies.

<Effects of the Invention> As described above, according to the present invention, the pedestal provided corresponding to the horn is moved back and forth with the horn to prevent contact between the horn and the pedestal, thereby eliminating wear of the horn. Therefore, the durability is improved and it can be used for a long period of time without requiring replacement.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the ultrasonic bonding device according to the present invention, Fig. 2 is a perspective view of the main parts thereof, Fig. 3 is a side view of the operating state, and Fig. 4 is a plan view of the conventional device. It is. 3... Ultrasonic oscillator, 5... Horn, 6... cradle.

Claims (1)

[Claims] 1. A clamp plate that clamps sheets supplied in a stacked state from both sides, a horn that is attached to an ultrasonic oscillator that moves back and forth and irradiates the sheets with ultrasonic waves, and a horn that corresponds to the horn. and a pedestal disposed on the opposite side of the sheet, the pedestal being formed into a cone shape with a tip toward the horn side, and the pedestal being configured to move the ultrasonic oscillator back and forth. An ultrasonic bonding device characterized in that it is configured to move back and forth in synchronization with movement. 2. The ultrasonic bonding device according to claim 1, wherein the ultrasonic oscillator and the pedestal are connected to a single driving means.