JPS6253334B2 - - Google Patents

Abstract

PURPOSE:To obtain the titled machine capable of welding two objects with a certain width thereof being overlapped, by giving bending moments to the objects by two pressing elements when the objects are moved. CONSTITUTION:The right margin of a first sheet 20 is inserted between a press plate 23 and a bed 2 and is abutted on a pin 22. The left margin of a second sheet 21 is inserted between a receiving plate 25 and a press plate 28 and is abutted on a pin 27. A prescribed width B of the sheet 20 and the sheet 21 are overlapped. A press roller 15 is lowered to pinch the overlapped section between the press roller 15 and a processing surface 12 of a processing horn 11, and ultrasonic vibrations are generated in an ultrasonic vibrator 6. Rotating shafts 24a, 29a of rollers 24, 29 borne down on the sheets 20, 21 are inclined againt the feeding direction of the roller 15 to give bending moments to the sheets 20, 21 so that the sheets 20, 21 are urged to abut on the guide pins 22, 27.

Description

DETAILED DESCRIPTION OF THE INVENTION In order to join a pair of sheet-shaped workpieces made of thermoplastic resin, the edge portions of each workpiece are overlapped with each other, and the overlapping portion is heated by frictional heat based on ultrasonic vibration. The purpose of this invention is to provide an ultrasonic processing machine that can weld two workpieces with a constant overlapping width.

An embodiment of the present invention will be described below with reference to the drawings. First, in Fig. 1, 1 is a workbench that constitutes a part of the machine frame, and a bed 2 is placed on the top surface of the workbench.
is fixed. Reference numeral 3 denotes a frame fixed to the lower surface of the bed 2, on which a vibrator assembly 5 is supported via a pair of supports 4 so as to be rotatable around a vertical line. This transducer assembly 5 contains an ultrasonic transducer 6, and is rotated in a predetermined direction by a motor 7 fixed to the frame 3 via a belt 8. The ultrasonic transducer 6 is supplied with a high-frequency current from a high-frequency generator (not shown) via a pair of slip rings 9 fixed to the transducer assembly 5 and a pair of contacts 10 fixed to the frame 3. It begins to vibrate like a sonic wave. 11 is an ultrasonic transducer 6
The processing horn is connected to the upper part of the processing horn via an amplification horn (not shown).The upper part of the processing horn is formed into a cylindrical shape, and the annular processing surface 12, which is the upper end surface, vibrates ultrasonically in the vertical direction. It is exposed to the upper surface of the workbench 1 through a circular hole 13 formed in the bed 2, and its processing surface 12 is placed at the same level as the upper surface of the bed 2.

On the other hand, reference numeral 14 denotes a head portion fixed above the workbench 1 by a support mechanism (not shown), and a presser roller 15 is arranged at the bottom of this head portion so as to face the left side portion of the processing surface 12 in FIG. . This pressing roller 15 is rotatably provided on a roller support 16 that is supported movably in the vertical direction by the head section 14, and is brought into contact with the processing surface 12 via a belt 18 by a motor 17 fixed to the head section 14. It is rotated in the same direction as the rotation direction of the processing surface 12. Reference numeral 19 denotes a presser foot lifting lever provided on the head portion 14, which, when pushed up as shown in FIG.

Now, FIGS. 2 and 3 show a sheet guiding device, which is mounted on the bed 2 in front of the presser roller 15.
First and second sheets 20 and 21 made of thermoplastic resin corresponding to first and second workpieces are guided to overlap with each other with a predetermined overlap width. To explain the specific configuration of this seat guiding device, 22
are a pair of first guide pins corresponding to the first guide member, which are located in front of the right side of the presser roller 15 (second
It protrudes above the bed 2 with a front-to-back positional relationship (downward in the figure). Reference numeral 23 denotes a first holding plate whose right end is supported by the first guide pin 22 so as to be rotatable in the vertical direction. A first roller 24, which is a first pressure contact and presses against the sheet 20, is rotatably attached. The rotation shaft 24a of the first roller 24 is arranged at an angle of about 45 degrees with respect to the feeding direction of the sheets 20, 21 (indicated by arrow A in FIG. 2). Reference numeral 25 designates a receiving plate for the second sheet 22 whose left half is formed high in a stepped manner, and this left half is stacked above the right half of the first holding plate 23, and has a long hole extending in the left-right direction. 25a
It is fixed on the bed 2 with a screw 26 inserted therethrough so that its horizontal position can be adjusted. Reference numeral 27 denotes a pair of second guide pins corresponding to the second guide member, and these are located in front of the left side of the presser roller 15 (lower side in FIG. 2).
The guide pin 25 is protruded from the left end of the receiving plate 25 in a front-to-back positional relationship, and is spaced leftward from the first guide pin 22 by a predetermined distance B. Reference numeral 28 denotes a second holding plate whose left end is supported rotatably in the vertical direction by the second guide pin 27, and this holds the second sheet 21 at a position away from the second guide pin 27, for example at the right end. A second roller 29, which is a second pressure contact, is sandwiched between the receiving plate 25
is rotatably provided. And this second
The rotating shaft 29a of the roller 29 rotates between the sheets 20, 2
It is arranged at an angle of about 45 degrees with respect to the feeding direction A of 1. 30 is a presser arm fixed to the upper end of the second guide pin 27 on the front side that projects upward from the second presser plate 28, and screw rods 3 are attached to both left and right ends of this presser arm.
1 and 32 protrude downward. 33 is a compression spring, which is connected to the first holding plate 23 and the screw rod 3.
1 and an adjustment knob 34 screwed onto the first sheet 20 to urge the first presser plate 23 downward, thereby bringing the first roller 24 into pressure contact with the first sheet 20. The strength of the pressure contact force can be changed by turning an adjustment knob 34 and moving it up and down. A compression spring 35 is provided between the second presser plate 28 and an adjustment knob 36 screwed onto the screw rod 23, and in the same way as the compression spring 33, this compressor spring is attached to the second presser plate 28 and the second roller 29. is brought into pressure contact with the second sheet 21.

In the above configuration, the first and second sheets 20,
21 to each other, first push up the presser foot lifting lever 19 to hold the presser roller 15 in the upper position, and move the right edge of the first sheet 20 to the first presser plate 23 using the compression spring 33. It is pushed up against the spring force of , and is inserted between the holding plate 23 and the bed 2 and brought into contact with the first guide pin 22 . Further, the left end edge of the second sheet 21 is similarly inserted between the receiving plate 25 and the second holding plate 28 and brought into contact with the second guide pin 27. As a result, the right edge of the first sheet 20 and the second sheet 2
The left edge of No. 1 is overlapped with a predetermined overlapping width B. Therefore, the presser foot lifting lever 19 is operated to lower the presser foot roller 15, and the first and second sheets 2 are lowered.
The overlapping portion 37 of 0 and 21 is sandwiched between the press roller 15 and the machining surface 12 of the machining horn 11, and in this state, the ultrasonic vibrator 6 generates ultrasonic vibration, and the motors 7 and 17 are started. let Then,
Ultrasonic vibrations are transmitted to the processing horn 11, and the processing horn 11 and presser roller 15 rotate, thereby causing the first and second sheets 20, 21
is sent in the direction of arrow A while the overlapping portion 37 of the portion sandwiched between the processing surface 12 and the presser roller 15 is welded. In this case, the first and second sheets 20,
first and second rollers 24 in pressure contact with 21;
29 rotates as each sheet 20, 21 is transported, but each rotating shaft 24a, 29a is rotated in the feeding direction A.
Because it is tilted relative to
exerts a frictional force on Further, due to the pressure contact of the rollers 24, 29 to each sheet 20, 21, a frictional force also acts between the bed 2, the receiving plate 25, and each sheet 20, 21. And these frictional forces are applied to each sheet 2
It acts as running resistance of 0.21, but roller 2
Since the pressure contact position of sheets 4 and 29, that is, the position where the running resistance is applied, is in front of the position of the presser roller 15, that is, the position where the running force is applied, and shifted in the left-right direction, a bending moment is applied to each sheet 20, 21. Forces in the directions of arrows C and D that approach each other act. Furthermore,
In this embodiment, since the rollers 24 and 29 are tilted, the same feeding force in the directions of arrows C and D is applied to the sheets 20 and 21 by their rotation. This 2
The first and second sheets 20, 2 are
1 is constantly moved in the direction of arrow A by keeping its right and left edges connected to the first and second guide pins 22, 2.
7 and is urged to come into contact with it. Therefore, even if the operator does not put his hands on the edges of both sheets to keep them in constant contact with the position regulating guide pins in order to keep the overlapping width of both sheets constant as in the conventional case, both sheets 20 and 21 can be fixed. The overlapping width of the guide pins 22 and 27 is automatically adjusted to be always equal to the distance B between the first and second guide pins 22 and 27.

Note that in this embodiment, the first and second insulation displacement
and second rollers 24, 29, but
The present invention is not limited to this, and each pressure contact may be constructed of a mere protrusion for frictional sliding contact, as long as it does not cause any problem even if the steel ball or workpiece is slightly scratched. The frictional resistance generated by the protrusions creates a bending moment in each sheet 20, 21, so that the overlapping width can always be kept constant.

As described above, the present invention allows the edges of both workpieces to always overlap each other as the two workpieces are transferred, even if the operator does not always guide the two workpieces with his/her hand. This has an excellent effect in that the overlapping width can always be adjusted to a constant value by applying a biasing force in the direction.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a partially cutaway front view, FIG. 2 being an enlarged plan view of the main part, and FIG. 3 being an enlarged longitudinal cross-sectional view of the same. In the figure, 2 is a bed, 6 is an ultrasonic vibrator, 11 is a processing horn, 12 is a processing surface, 15 is a presser roller, 20, 21 are first and second sheets (workpieces), 22, 27 are first and second guide pins (guiding members), 24 and 29 are first and second rollers (pressure contacts), and 37 is an overlapping portion.

Claims (1)

[Claims] 1. In order to connect the first and second sheet-shaped workpieces made of thermoplastic resin, one edge of each is overlapped, and the overlapping part is placed opposite the processing surface of the processing horn and the processing surface thereof. In an ultrasonic processing machine that transfers the workpiece while welding the workpiece by applying ultrasonic vibration to the processing horn while holding the workpiece between the disposed presser rollers, the first workpiece is in contact with an edge of the workpiece a first guide member that guides the workpiece to the machining surface, and an edge of the second workpiece adjacent to the first guide member; a second guide member that guides the polymerization;
A first guide member disposed close to the first guide member and located in front of the processing horn and away from the edge.
a first insulator that is pressed against the workpiece, and a second workpiece that is disposed close to the second guide member and faces the first insulator across the edge of the workpiece. and a second pressure welding element that is pressed into contact with the second pressure welding element.
When the two workpieces are transferred, the first and second insulators are configured such that the edges of the first and second workpieces abut the first and second guide members, respectively. , an ultrasonic processing machine characterized in that a bending moment is applied to each workpiece.