JPH08290474A - Ultrasonic stapler - Google Patents

Abstract

PURPOSE: To carry out the ultrasonic welding of good finish. CONSTITUTION: This stapler comprises an ultrasonic wave generating means 14 for generating the ultrasonic vibration, a horn section 12 for amplifying the ultrasonic vibration, a tool section 20 provided with a processing face 20a at its end and fitted on the horn section 12, and a stapler main body 16 for holding the horn section 12 and the ultrasonic wave generating means 14. Also a clamping handle 18 engaged rotatably with the stapler main body 16 and having a pressurizing face 18a facing the processing face 20A of the tool section 20 on its rotating end is provided, and the end of the tool section 20 is bent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic stapler, and more particularly to an ultrasonic stapler suitable for hand-held work.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional example. In the ultrasonic stapler 50, an ultrasonic wave generating means 54 and a horn portion 52 adjacent to the ultrasonic wave generating means 54 are housed in a stapler body 56, and a tip portion of the horn portion 52 is exposed to the outside of the stapler body 56. And figure 1 of stapler body
A gripping handle 58 is rotatably provided at the right end portion of 1.

The tip portion of the horn portion 52 is formed in a columnar shape, and on the outer peripheral surface of this columnar portion, it is opposed to the pressing surface 58A provided at the rotating end of the holding handle 58 described above. A processed surface 52A is provided. Then, the object to be welded is sandwiched between the processing surface 52A and the pressing surface 58A to perform ultrasonic welding.

When this conventional example is used, first, ultrasonic vibration is generated from the ultrasonic wave generating means 54, its amplitude is amplified by the horn portion 52, and vibration in the axial direction is generated at the cylindrical tip portion of the horn portion 52. Transmitted.

At this time, the welding object is sandwiched between the processed surface 52A of the horn portion 52 and the pressing surface 58A of the lower receiving member 58, and the lower receiving member 58 is pulled toward the stapler main body 56 side, so that the welding object is welded. Is pressed to the processed surface 52A side. Then, ultrasonic vibrations are transmitted in a direction parallel to the machined surface 52A to the machined surface 52A that is in contact with the object to be welded, and the frictional heat generated at that time causes the object to be welded to be melted. It is pressed from the pressure surface 58A to complete the welding.

[0006]

However, in the ultrasonic stapler in the above-mentioned conventional example, ultrasonic vibration is transmitted in the direction parallel to the processing surface, and welding is performed by frictional heat generated by sliding of the objects to be welded. In this case, since the material to be welded is melted over a wider area than the machined surface of the tool portion, its finish state is severely deformed,
The shape becomes messy, which causes uneven welding strength at the welded part.In addition, since the tip of the tool part vibrates laterally during pressing, the welded surface of the object to be welded may be roughened. It was

[0007]

OBJECTS OF THE INVENTION It is an object of the present invention to improve the disadvantages of the conventional example, and in particular to provide an ultrasonic stapler having a good finished state of the material to be welded.

[0008]

According to the present invention, an ultrasonic wave generating means for generating ultrasonic vibrations, a horn portion for amplifying the ultrasonic vibrations, and a tip portion mounted on the horn portion are provided. A tool part having a processed surface, a horn part, and a stapler main body for accommodating the ultrasonic wave generating means, and additionally, rotatably engages the stapler main body and has a tool part at its rotating end. And a gripping handle having a pressing surface opposed to the processed surface, and further, the tip portion of the tool portion is curved.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the tip portion of the tool portion is in a state substantially vertical to the vibration direction of the ultrasonic vibration generated by the ultrasonic wave generating means. The structure is curved.

In addition to the structure of the present invention described in claim 1 or 2, the present invention described in claim 3 has a structure in which the tool portion is detachably formed with the horn portion.

The above structure is intended to achieve the above-mentioned object.

[0012]

When ultrasonic vibration is generated by the ultrasonic wave generation means, the horn portion receives the ultrasonic vibration and amplifies the amplitude of this ultrasonic vibration and transmits it to the tool portion. Then, the ultrasonic vibration is transmitted to the processing surface provided on the curved tip portion of the tool portion. At this time, the ultrasonic vibration is transmitted according to the curved shape of the tip portion of the tool portion, and the ultrasonic vibration is transmitted on the processing surface in the direction perpendicular to the processing surface.

Further, between the pressing surface provided at the rotating end of the pinching handle which is rotatably engaged with the stapler body for accommodating the horn portion and the ultrasonic wave generating means, and the processing surface which faces the pressing surface. , Hold the gripping handle and the stapler body at the same time with the material to be welded in between, and pull the gripping handle toward the stapler body so that the material to be welded is between the processed surface and the pressure surface. Sandwiched between
The work surface is pressed and brought into close contact.

As a result, ultrasonic vibration is applied perpendicularly to the object to be welded from the machined surface at the tip of the tool.
As a result, the material to be welded is melted and welded.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall view of an ultrasonic stapler 10 of this embodiment. The ultrasonic stapler 10 is equipped with an ultrasonic wave generating means 14 for generating ultrasonic vibrations, a horn portion 12 for amplifying the ultrasonic vibrations, and a tip of the horn portion 12 along the vibration direction of the ultrasonic vibrations. Further, it has a tool portion 20 having a processed surface 20A at its tip, and a stapler body 16 for accommodating the horn portion 12 and the ultrasonic wave generating means 14.

At the rear end of the stapler body 16 (the right end in FIG. 1), there is provided a gripping handle 18 which is rotatably engaged with the stapler body 16 and is used for gripping. The rotating end of the handle 18 has a pressing surface 18 facing the processing surface 20A of the tool portion 20.
A is provided.

Each section will be described in detail below.

First, in the horn portion 12, a cylindrical portion 12B having a relatively large diameter and a cylindrical portion 12D having a relatively small diameter are integrally formed via an intermediate portion 12C having a substantially exponential shape. A flange 12E having a flange shape is provided between the large cylindrical portion 12B and the intermediate portion 12C.

In this horn portion 12, an intermediate portion 12C and a small column portion 12D are projected to the outside from a projecting hole 16A provided at the front end side (the left end portion in FIG. 1) of the stapler body 16 described above, and a flange is formed. 12E with protruding hole 16A
The fitting state of the horn portion 12 is maintained with respect to the stapler main body 16 by fitting the fitting groove 16B provided near the staple groove 16B.

Further, the horn portion 12 is a large cylindrical portion 12
The end face of B is adjacent to the ultrasonic wave generating means 14, and ultrasonic vibrations are transmitted in the axial direction of the horn portion 12. Also,
The tool portion 20 is detachably mounted on the tip of the small column portion 12D.

The ultrasonic wave generating means 14 is the stapler body 1.
It is stored in 6. The ultrasonic wave generation means 14 has an aluminum block, an electrode, and a ceramic vibrator, which are sequentially arranged adjacent to the horn portion 12, and these portions are fastened and fixed by bolts (not shown).

The ceramic vibrator is connected to an oscillator 15 outside the ultrasonic stapler 10 via electrodes and lead wires. When a voltage of a predetermined oscillation frequency is applied from the oscillator 15 via the electrodes and the lead wire, ultrasonic vibration is generated from the ceramic vibrator, and this ultrasonic vibration is transmitted to the horn unit 12, and this horn unit 12 is transmitted. The amplitude is amplified at 12 and further transmitted to the tool unit 14.

The stapler main body 16 is a long rectangular parallelepiped, and inside the stapler main body 16, there is a space for accommodating the horn portion 12 and the ultrasonic wave generating means 14. Further, as described above, the tip end portion is provided with the projecting hole 16A that is electrically connected to the internal space, and the fitting groove 16B provided slightly inside the projecting hole 16A is used to mount and hold the horn portion 12. .

On the other hand, at the rear end portion (right end portion in FIG. 1) of the stapler body 16, a gripping handle 18 is provided.
The stapler body 16 is rotatably engaged with the stapler body 16.
Reference numeral 18B indicates a pin that serves as a rotation fulcrum of the gripping handle 18.

The gripping handle 18 is formed of a long plate-like member, one end of which is provided with an engaging portion with the stapler body 16, and the other end of which is a rotating end is provided with a tool portion 20. The pressing surface 18A facing the processed surface 20A is provided. When the pressing surface 18A is in contact with the processing surface 20A at the tip of the tool portion 20, the gripping handle 18 is substantially parallel to the stapler body 16.

Stapler body 16 of gripping handle 18
Side walls 18D, 18D (one of the two is not shown) rising from both side ends of the gripping handle 18 at one end (the right end in FIG. 1) of the engaging portion with
The stapler body 16 is interposed between the two side walls 18D and 18D, and the pin 18
By penetrating B through the through holes provided in the side wall 18D, the stapler body 16, and the side wall 18D in this order,
The gripping handle 18 is rotatably engaged with the stapler body 16.

Further, the engaging portion of the gripping handle 18 has an opening formed in a U shape when viewed from the direction of arrow A in FIG. 1, and the U-shaped bottom portion 18C (dotted line portion) is formed. ,
Since it is formed with a predetermined thickness, the gripping handle 1
When the pressing surface 18A is separated from the processing surface 20A by rotating 8, the bottom surface of the stapler body 16 and the U-shaped bottom portion 18C come into contact with each other (see FIG. 4), and the gripping handle 18 is rotated. It has a structure that restricts movement.

Furthermore, while the gripping handle 18 is restricted from rotating as described above, the pressing surface 18A is provided by an elastic member (not shown) provided between the gripping handle 18 and the stapler body 16. And the processed surface 20A are urged in a direction of separating from each other. With this elastic member, at the time of work, the gripping handle 18 is pulled toward the stapler body 16 side to perform ultrasonic welding, and then the gripping handle 18
Is urged by the elastic member and automatically rotates so that the pressing surface 18A and the processing surface 20A are separated from each other, so that the next ultrasonic welding work is immediately continued without the need for manpower for this separation work. It is possible to use this ultrasonic stapler 10
Will improve the workability of.

Further, the elastic member may be any member having an elastic force such as a coil spring, a leaf spring, an air spring, rubber or sponge. Furthermore, by fixing one end of these elastic members to the gripping handle 18 side and fixing the other end to the stapler main body 16 side, the sandwiching handle 18 is urged by the elastic member after the welding and is separated. It is possible to add not only a function of rotating the gripping handle 18 in the direction but also a function of restricting the gripping handle 18 from rotating more than necessary.

Reference numeral 24 is a lead-lead switch, and the application of the voltage of the oscillation frequency from the oscillator 15 to the ultrasonic wave generating means 14 is performed through the lead-lead switch 24.
The push lead switch 24 is attached near the tip of the stapler body 16. As a result, as shown in FIG. 4, when the gripping handle 18 is pulled toward the stapler body 16 side to perform the welding work, the push lead switch 24 is located at the position of the thumb of the operator's hand T. The pressing operation of the lead switch 24 can be easily performed.

Next, the tool section 20 will be described. As shown in FIG. 2 (A), the tool portion 20 in the present embodiment is mainly composed of a linear portion 20B formed in a linear column shape and a curved portion 20C formed in a column shape curved downward in the figure. Is configured. The straight portion 20B and the curved portion 20C are formed to have a uniform diameter except for the contact portion with the horn portion 12 which is formed to be slightly thicker, and the diameter is smaller than that for welding work in a narrow region. It is finely tuned to be possible.

Further, the processed surface 2 is provided at the tip of the curved portion 20C.
0A is formed.

Further, the center axis of the curved portion 20C at the position of the machined surface 20A is orthogonal to the center axis of the straight portion 20B, and the machined surface 20A is formed perpendicular to the center axis of the curved portion 20C.

As described above, the ultrasonic vibration transmitted to the machining surface of the tool portion 20 which is formed in a shape curved toward the tip end causes the linear portion 20B near the horn portion 12 to move in the central axis direction of the linear portion 20B. To the processed surface 2 at the tip
At 0A, the vibration in the vertical direction is mainly transmitted to the processed surface 20A. That is, in the processed surface 20A, the straight line portion 2
Ultrasonic vibrations are transmitted in a direction orthogonal to the central axis direction of 0B.

Here, the shape of the tool portion is not limited to the above. For example, the processed surface 20
A may be formed obliquely with respect to the central axis of the linear portion 20B, and as shown in FIG. 2B, the central axis of the curved portion at the machining surface position is relative to the central axis of the linear portion. It may be formed at a certain angle α (α ≠ 90 °). In this case, the pressing surface 1 provided at the rotating end of the gripping handle 18
8A needs to be formed in an inclined state corresponding to the processed surface.

As shown in FIG. 2 (A), a screw portion 20D is provided on the mounting portion of the tool 20 on which the horn portion 12 is attached. The screw portion 20D is screwed into a screw hole 12F provided at the tip of the horn portion 12, and the tool 20 is detachably attached to the tip portion of the horn portion 12.

Another tool 40 is shown in FIG. This tool 40 replaces the threaded portion 20D of the tool 20 described above,
An insertion section 40A is provided. The corresponding horn portion 32 is provided with a fitting hole 32A that fits into the insertion portion 40A at its tip. Further, a screw hole 32B is formed at the tip of the horn portion 32 so as to vertically penetrate the fitting hole 32A from the outside, and a set screw 32C screwed into the screw hole 32B allows the insertion portion 40A of the tool portion 40 to be inserted. Is fixed by pressing.

The operation of this embodiment will be described by taking as an example the operation of welding the opening of the plastic egg pack 26.

First, as shown in FIG. 4, an operator holds the ultrasonic stapler 10 by holding the stapler body 16 and the gripping handle 18 with one hand T. Then, the ultrasonic stapler 10 is brought close to the egg pack 26, and the processing surface 20A of the tool portion 20 and the pressing surface 1 provided on the gripping handle 18 are provided.
Positioning is performed so that the welding points 27, 27 of the egg pack 26 are interposed between the 8A and 8A.

After the positioning, the gripping handle 18 is manually pulled in the direction in which the pressing surface 18A approaches the processing surface 20A. At this time, simultaneously with this operation, the push lead switch 24 is pressed downward in FIG. 4 by the thumb. As a result, the ultrasonic wave generation means 14 is applied with a voltage of the oscillation frequency from the oscillator 15, and ultrasonic vibrations are transmitted, which are transmitted to the tool portion 20 via the horn portion 12, and the processed surface 20A is ultrasonically vibrated. It becomes a state.

By pulling the gripping handle 18, the welding points 27, 27 of the egg pack 26 are clamped between the processing surface 20A of the tool portion 20 and the pressing surface 18A. As a result, the processing surface 20A and the pressing surface 18A of the tool portion 20
The pressing force from and is applied, the ultrasonic vibration is transmitted, and the egg pack 26 is melted and welded.

FIG. 5 shows a welded state of the egg pack 26 according to this embodiment. The egg pack 26 has the welding point 2
7, 27 are clamped between the processed surface 20A of the tool portion 20 and the pressing surface 18A of the clamping handle 18 as described above, and are pressed against these surfaces. At this time, ultrasonic vibrations in a direction perpendicular to the processed surface 20A of the tool portion 20 are transmitted to the processed surface 20A, and the direction of pressure contact and the direction of this ultrasonic vibration coincide with each other. As a result, ultrasonic vibrations are efficiently transmitted from the processed surface 20A to the welding portion, so that in the above-mentioned welding operation, the processed surface 20A of the tool portion 20 abuts on the egg pack 26 before the egg pack 26 melts. The time to start is extremely short. Then, by completing the welding operation in a short time, the excess portion of the welding portion 27 of the egg pack 26 is not melted. For example, as shown in FIG. 5, the upper welding portion 27 and the lower welding portion 27 are welded. Since only the contact portion 27A of the portion 27 is melted, the finish is beautiful, and since the deformation of the material to be welded is not caused, the strength after welding is increased.

FIG. 6 shows a finished state after welding when another tool portion having a machined surface different in shape from the tool portion 20 is used. According to this, reference numeral 28A
Indicates the finish when the machined surface of the tool portion is donut-shaped, reference numeral 28B indicates the finish when the processed surface is triangular, and reference numeral 28C indicates the finish when the processed surface is quadrangular. In this way, since the object to be welded is pressed in the vibration direction of the machined surface of the tool portion, the transmission efficiency of the vibration energy is good, and the welding operation is performed promptly. Therefore, the shape of the machined surface of the tool portion is changed. This makes it possible to change the finished shape of the material to be welded.

Here, in the present embodiment, a limit switch may be provided between the stapler body 16 and the gripping handle 18 instead of the push lead switch 24 described above. This limit switch is used for gripping handle 1 when welding.
8 is pulled toward the stapler main body 16 side and the space between the stapler main body 16 and the gripping handle 18 is narrowed, so that the stapler main body 16 or the gripping handle 18 presses the oscillator, and the limit switch is closed. The structure is such that the voltage of the transmission frequency from 15 is applied. As a result, the gripping handle 1
The ultrasonic welding is performed only by the operation of pulling 8, so that it is possible to eliminate the trouble of pressing the lead push switch every time the work is performed. Further, this limit switch is always applied at a constant timing in the process of pulling the gripping handle 18 toward the stapler body 16 side. Therefore, by attaching the limit switch to a predetermined position, the welded substance can be fixedly welded. It is possible to perform ultrasonic welding in this state.

Further, the oscillator 15 described above may be integrally and suitably mounted inside the stapler body 16 of the ultrasonic cutter 10. As a result, since the lead wire stretched between the ultrasonic cutter 10 and the oscillator 15 does not limit the operation range associated with the work of the ultrasonic cutter, the working range of the ultrasonic cutter 10 is widened and the portability is improved. Is improved.

Here, a comparative example having a configuration different from that of this embodiment will be described with reference to FIG.

As shown in FIG. 7, in this comparative example, the ultrasonic wave generating means 4 arranged in a line in the stapler body are arranged.
4, a horn portion 42 and a tool portion 43, and a stapler main body 46 having a predetermined length and equipped with these at one end,
The ultrasonic stapler 40 is composed of a holding handle 48 that is rotatably engaged with the other end of the stapler body 46. In this comparative example, the tool portion 43 is formed in a linear shape.

A processing surface 43A is provided at the tip of the tool portion 43 for contacting the object to be welded and transmitting ultrasonic vibrations. The processing surface 4A is provided at the turning end of the gripping handle 48.
A pressing surface 48A facing the 3A is provided.

By arranging the ultrasonic wave generating means 44, the horn portion 42 and the tool portion 43 in a line, the ultrasonic vibration generated from the ultrasonic wave generating means 44 passes through the horn portion 42 and the tip portion of the tool portion 43. Is transmitted to the machined surface 43A through a straight path. As a result, ultrasonic vibration is transmitted to the processed surface 43A in a direction perpendicular to the processed surface 43A.

When performing ultrasonic welding, it is desirable that ultrasonic vibrations be transmitted in a direction perpendicular to the object to be welded. In this comparative example, in order to achieve this object, the ultrasonic wave generating means 44, The horn portion 42 and the tool portion 43 are arranged in a line in a direction orthogonal to the stapler body 46 and are mounted on the stapler body 46. Further, the pressurizing surface 48A provided at the tip of the gripping handle 48 that is rotatably engaged with the stapler main body 46 has a processing surface 43A.
Since the welded object is sandwiched between the machining surface 43A and the pressing surface 48A, ultrasonic vibrations are transmitted perpendicularly from the machining surface 48A because of the positional relationship in which the machining object A and the pressing surface 48A are in parallel contact with each other.

As a result, during the ultrasonic welding work according to the comparative example, heat is generated due to collision and compression of the objects to be welded, almost only in the region of the machined surface 43A where the objects to be welded are in contact with each other. The material to be welded is melted and welded. As a result, the object to be welded is welded in a shape substantially equal to the shape of the processed surface 43A without being deformed irregularly,
Also, the welding strength is stable because the finish is always constant.

However, the ultrasonic stapler 40 in the comparative example has one end portion of the stapler main body 46 for the purpose of applying ultrasonic vibration in a direction perpendicular to the object to be welded.
Since the ultrasonic vibration generating means 44, the horn part 42 and the tool part 43 are arranged in a direction orthogonal to the stapler body 46, the shape of the ultrasonic stapler 40 is substantially L-shaped as shown in FIG. , This ultrasonic stapler 4
It was unavoidable to increase the size to 0.

The ultrasonic stapler 10, which is an embodiment of the present invention, is provided so as to protrude from the stapler body 16 because the ultrasonic wave generating means 14 and the horn portion 12 are housed inside the stapler body 16. Of course, the entire ultrasonic stapler is downsized as compared with the comparative example. Since the tip end side of the tool portion 20 is curved, the processing surface 20 provided at the tip of the curved tool portion 20.
Since ultrasonic vibrations are transmitted perpendicularly to A, ultrasonic welding can be performed on the object to be welded in the same finished state as in the comparative example.

Various tests were conducted for the purpose of investigating the influence of the vibration state on the machined surface due to the size and shape of each part of the tool part, and the results will be described with reference to FIGS. 8 to 10.

First, comparison and examination were carried out for a plurality of tool parts having different sizes and shapes. The same condition is that each of these tool parts has a machined surface formed parallel to the central axis direction of the straight part.

FIG. 8 is an explanatory diagram for explaining the reference numerals set for the dimensions of each part of the tool part. First, the central axis direction of the linear portion of the tool part is the X axis direction, and the direction orthogonal to this is the Y axis direction. The symbol φ indicates the diameter of the straight portion and the curved portion of the tool portion. The straight portion and the curved portion are formed of a cylinder having the same diameter. Reference sign L is the length in the X-axis direction excluding the screw part of the tool part, and reference sign D is the length in the Y-axis direction. Further, the symbol R indicates the radius of curvature of the curved portion, and the symbol θ indicates the angle formed by the central axis direction of the straight portion and the central axis at the machining surface position of the curved portion.

Amplitudes in the X-axis direction and the Y-axis direction of each machining surface are measured in four tool parts (1) to (4) having different numerical values set by the above-mentioned symbols, and the measurement results are shown in FIG. 9 shows. In FIG. 8, X indicates the amplitude in the X-axis direction,
Y indicates the amplitude in the Y-axis direction. Here, as the vibrator incorporated in the ultrasonic wave generation means used for this measurement, a vibrator that oscillates at a vibration frequency of 60 [kHz] was used.

It is desirable that the amplitude of ultrasonic vibration on the machined surface be large in the vertical direction and small in the horizontal direction with respect to the machined surface. That is, the amplitude in the Y-axis direction should be large and the amplitude in the X-axis direction should be small. According to FIG. 8, results close to this appear in the tool parts (3) and (4).
These tool parts have a common point that the radius of curvature R of the curved part is small and the angle θ formed by the central axis direction of the straight part of the tool part and the central axis at the machining surface position of the curved part is 90 degrees. Therefore, it is considered that the tool part satisfying these conditions can perform the ultrasonic welding work more ideally.

FIG. 10 shows the tendency condition of the tool portion in which the amplitude of ultrasonic vibration on the machined surface is large in the vertical direction and small in the horizontal direction with respect to the machined surface. FIG. 10A shows the relationship between the radius of curvature R of the curved portion and the diameter φ of the tool portion,
FIG. 10B is a diagram showing the relationship between the radius of curvature R of the curved portion and the oscillation frequency f of the ultrasonic vibration generated by the ultrasonic wave generation means. In any of the figures, the straight line in the figure shows a tendency that the amplitude of the machined surface is an ideal vibration. FIG. 10 (A)
According to the above, when the diameter φ of the tool increases, the radius of curvature R
Tends to increase in proportion to that, and FIG.
According to the above, the radius of curvature tends to decrease as the oscillation frequency f increases.

As the tool portion 20 equipped on the ultrasonic stapler 10 disclosed in the above-described embodiment, one that satisfies the conditions shown in the above test results is used. Therefore, the processed surface 20A of the tool portion 20 is
Ultrasonic vibrations in the vertical direction are transmitted to A, whereby the object to be welded is welded in a shape substantially equal to the shape of the processed surface 20A without being deformed in a random manner, and the finish is the same as that of the comparative example described above, and it is always The welding strength becomes stable because of the finish in a certain state.

[0062]

According to the present invention as set forth in claim 1, the tool portion is curved so that the processing surface provided at the tip portion of the tool portion faces the pressing surface provided at the rotating end of the gripping handle. Therefore, the ultrasonic vibration in the vertical direction of the work surface is transmitted to the work piece that is in contact with the work surface, and the work piece is approximately the same in shape as the work surface without being deformed randomly. The shape is welded, and the weld strength is stable because the finish is always constant.

Further, when the ultrasonic vibrations in the vertical direction of the machined surface are transmitted, the ultrasonic vibrations are transmitted efficiently and the welding work can be carried out quickly and in a short time. Therefore, the material to be welded is excessively melted. It is possible to weld only a predetermined welded portion without causing any damage. Further, this makes it possible to perform ultrasonic welding in a predetermined welding shape according to the shape of the processed surface.

Since the tool portion is curved,
It is possible to store the ultrasonic vibration generating section and the horn section in the stapler main body, so that the ultrasonic vibration generating means and the horn section do not project from the stapler main body, and it is possible to reduce the overall size, Since the position of the center of gravity of the entire ultrasonic stapler is almost at the stapler body, it is possible to perform the work in a stable operation when the ultrasonic stapler is held by hand.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the tip portion of the tool portion is in a state substantially vertical to the vibration direction of the ultrasonic vibration generated from the ultrasonic wave generating means. Since it is curved, the ultrasonic vibration generated from the ultrasonic wave generating means is better transmitted to the machined surface of the tip portion of the tool portion in the direction perpendicular to the machined surface.

In addition to the effect of the present invention as set forth in claim 1 or 2, the present invention according to claim 3 is characterized in that the tool portion is detachably formed with the horn portion, so that the tool portion having different shapes and sizes is provided. When using, the replacement is easier than in the case where the horn part is integrated, and since only the tool part is formed, a small amount of material is required.

When the tool part and the horn part are separate members, at the time of forming them, it is possible to use at least a shaving means such as a lathe to form the horn part. The formation is facilitated as compared with the case where these are integrally formed.

According to the present invention, it is possible to provide an unprecedented excellent ultrasonic stapler having the above-mentioned effects.

[Brief description of drawings]

FIG. 1 is a schematic front view in which an ultrasonic stapler of the present invention is partially cut away.

FIG. 2 is an explanatory view showing a tool unit equipped in the ultrasonic stapler of the present invention, FIG. 2 (A) is a view showing the tool unit disclosed in FIG. 1, and FIG. 2 (B) is another. It is a figure which shows an example of the tool part of.

FIG. 3 is an explanatory view showing another tool unit attached to the horn unit by a method different from that of FIG. 2 (A).

FIG. 4 is an explanatory diagram showing the operation of the ultrasonic stapler disclosed in FIG. 1.

FIG. 5 is an explanatory view showing a melted state of a material to be welded during ultrasonic welding work.

FIG. 6 is an explanatory view showing a welded state of an object to be welded when another horn portion is used.

FIG. 7 is a partially cutaway front view showing a comparative example of an ultrasonic stapler.

FIG. 8 is an explanatory diagram for explaining setting of symbols of respective dimensions when performing a comparative test using a plurality of tool portions having different shapes and dimensions of respective portions.

9 is an explanatory diagram showing the results of the comparative test of FIG.

FIG. 10 is an explanatory diagram showing the tendency of ultrasonic vibrations to occur in the direction perpendicular to the machined surface of the tool portion, and FIG.
Is a diagram showing the relationship between the radius of curvature of the tool part and the diameter of the tool part, and FIG. 10B is a diagram showing the relationship between the radius of curvature of the tool part and the oscillation frequency.

FIG. 11 is a partially cutaway schematic front view showing an ultrasonic welding machine as a conventional example.

[Explanation of symbols]

 10 Ultrasonic Stapler 12 Horn Unit 14 Ultrasonic Wave Generation Unit 16 Stapler Main Body 18 Clamping Handle 18A Pressurizing Surface 20 Tool Part 20A Processing Surface

Claims (3)

[Claims] 1. An ultrasonic wave generating means for generating ultrasonic vibrations, a horn part for amplifying the ultrasonic vibrations, a processing part at the tip part, and a tool part mounted on the horn part, the horn part, and A stapler body for holding the ultrasonic wave generating means, and a gripping handle which is rotatably engaged with the stapler body and has a pressing surface at a rotating end portion thereof which faces a processing surface of the tool portion; An ultrasonic stapler, characterized in that the tip portion of the tool portion is curved. 2. The ultrasonic stapler according to claim 1, wherein a tip portion of the tool portion is curved in a state substantially vertical to a vibration direction of ultrasonic vibration generated by the ultrasonic wave generating means. 3. The ultrasonic stapler according to claim 1, wherein the tool portion is formed so as to be detachable from the horn portion.