JPS6217861Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement regarding a press device for a high-frequency welder, and aims to improve operability.

By the way, in a high-frequency welder for processing materials such as synthetic fiber fabrics or synthetic resin films or sheets, the above materials are placed on one surface plate that also serves as an electrode, and then the other material is placed on top of the surface plate that also serves as an electrode. The pressure plate, which also serves as an electrode, is lowered, and while the material is strongly pressed by the pressure plate, the material is welded or cut by dielectric heating using high-frequency power.

However, in conventional welders, both the lowering of the pressure plate and the application of pressure by the plate described above are achieved manually using a foot-operated press device, so the position of the workpiece material and the pressure plate on the surface plate is Although alignment is easy and the pressure plate can be lowered relatively easily, on the other hand, even though a toggle mechanism is used, it takes a lot of effort to achieve strong pressure. This has the drawback that the operator is extremely fatigued, and as a result, work efficiency cannot be improved.

The present invention addresses the above-mentioned drawbacks of the conventional high-frequency welder and utilizes the advantages of a foot-operated press device while making it possible to easily achieve strong pressurization. In addition, a cam mechanism operated by mechanical force is combined, and the lowering of the pressure plate above the surface plate is performed by input, and the strong pressure applied by the pressure plate in the lowered position is performed by mechanical force. This is what I did. Hereinafter, an embodiment shown in the drawings will be described in detail.

In the figure, 1 is a high-frequency welder table, on which is placed a surface plate 2 that also serves as one high-frequency electrode, and 3 is a pressure plate that also serves as the other high-frequency electrode, on which the surface plate 2 is placed. It is located above 2. Reference numeral 4 denotes a press arm that is pivoted almost horizontally on a support shaft 5, and the above-mentioned pressure plate 3 is attached to the tip of the press arm. The pressure plate 3 is kept at a position above the surface plate 2. 7 is a toggle link pivotally supported by a support shaft 8, and together with a toggle rod 9 whose upper end is connected to the rear side of the support shaft 5 of the press arm 4, constitutes a toggle mechanism A; is a foot pedal provided at the lower end of the toggle link 7 via a pedal rod 11. Therefore, the movement of the foot pedal 10 in the direction of arrow A is transmitted to the press arm 4 via the toggle mechanism A, thereby lowering the pressure plate 3 at the tip onto the surface plate 2. Numeral 12 is a wedge-shaped cam, which together with a cam follower 13 provided at the upper end of the toggle link 7 constitutes a cam mechanism B. Numeral 14 is a cam support plate to which the cam 12 is fixed. Therefore, the movement of the cam 12 in the direction of arrow B is transmitted to the press arm 4 via the toggle mechanism A, and the pressure plate at the tip strongly presses the surface plate 2. A cam drive shaft 15 is rotatably supported by a bearing 16, and constitutes a cam drive mechanism C together with a cam drive plate 17 screwed onto a male threaded portion 15' of the shaft. However, one or more legs 18 provided on the cam support plate 14 slidably pass through the cam drive plate 17 and have a stopper 19 at the tip for preventing return, and both of the legs 14 , 17 is interposed with a pressurizing spring 20 that acts to widen the space between them. 21 is a reversible motor exemplified as a drive source for operating the cam mechanism B by mechanical force, and the cam drive shaft 15 is
The connection is via a suitable transmission mechanism, for example a belt 22. Reference numeral 23 is a foot switch that can be stepped on at will, and 24 is a press switch that is placed in a position to be pushed by a dog 25 of the pedal rod 11 when the foot pedal 10 has been rotated in the direction of arrow A. It is assumed that both switches 23 and 24 are designed to rotate the motor 21 in the required direction in order to move the cam 12 in the direction of arrow B only when both switches 23 and 24 are operated. 2
Reference numeral 6 denotes a lower limit switch that regulates the descending range of the pressure plate 3, and is attached to the cam drive plate 17, and when the drive plate moves forward by a predetermined distance with respect to the cam support plate 14, the lower limit switch 6 controls the lower limit switch of the pressure plate 3. 27 to stop the rotation of the motor 21 in the above-mentioned direction, and then to reverse the rotation after a predetermined period of time has elapsed. Reference numeral 28 denotes an upper limit switch for regulating the lifting range of the pressure plate 3, and in the illustrated example, it is attached to the bearing 16, and the cam drive plate 1
It is assumed that the motor 21 is pushed by a dog 29 that is pushed down when the motor 7 returns to a predetermined position, thereby stopping the reverse rotation of the motor 21. 30 is a workpiece material placed on the surface plate 2 described above. Note that the surface plate 2 and the pressure plate 3, which also serve as high-frequency electrodes, are connected to a high-frequency generation source in conjunction with the latter pressurizing the workpiece material 30 on the former.

In the above configuration, when the workpiece material 30 is first placed on the surface plate 2 and then the foot pedal 10 is stepped on in the direction of arrow A, the rotating action of the pedal rod 11 is caused by the rotation of the link 7 and the rod of the toggle mechanism A. 9 acts to push up the rear end of the press arm 4. Accordingly, the press arm 4 rotates counterclockwise in the figure using the support shaft 5 as a fulcrum, and lowers the pressure plate 3 at the tip onto the surface plate 2, that is, onto the workpiece material 30. Since the pressure plate 3 is lowered against the restoring spring 6, the spring 6 provides resistance to the movement of the foot pedal 10 in the direction of arrow A; however, the foot pedal Since the movement of the pedal 10 is transmitted to the press arm 4 via the toggle mechanism A as described above, the pedal can be moved easily without actually being hindered by the spring 6.

On the other hand, the positioning of the workpiece material 30 on the surface plate 2, especially the alignment of the material with respect to the pressure plate 3, is performed with the pressure plate being lowered as described above, and in this case, the positional deviation is corrected. This can be easily done by slightly adjusting the way the foot pedal 10 is depressed and slightly lifting the pressure plate 3. In addition,
When the pressure plate 3 is lowered as described above, the press switch 24 moves the dog 25 of the pedal rod 11
However, at this point, the foot switch 23 has not been operated yet, so the cam mechanism B and its drive mechanism C are also not operated, and the surface plate 2 and pressure plate 3 as high frequency electrodes are not operated.
is not connected to a high frequency source.

After the pressure plate 3 has been lowered in this manner and the positioning of the workpiece material 30 has been completed, when the foot switch 23 is then stepped on, the motor 21 rotates in a direction that advances the cam 12. That is, the rotation of the motor 21 is transmitted to the cam drive shaft 15 via the belt 22.
, the cam driving plate 17 screwed into the male threaded portion 15' of the shaft is raised and pushes up the pressure spring 20, so that the cam 12 is moved by the pressure spring acting on the cam support plate 14. The cam follower 13 of the toggle link 7 moves forward in the direction of the arrow B via the link 20 and is rotated to the position shown by the chain line.
catch up with However, at this point, the lowering switch 26 has not yet been operated, so the motor 21 continues to rotate and the cam drive plate 17 continues to press the pressure spring 20. Therefore, if the spring constant of the pressure spring 20 is made sufficiently large,
The pushing up force exerted by the cam drive plate 17 on the spring 20 is transmitted from the spring to the cam 12, and is further amplified from the cam follower 13 via the toggle mechanism A and transmitted to the press arm 4, thereby increasing the force that has already been lowered. The workpiece material 30 on the surface plate 2 is strongly pressed by the pressure plate 3. At this point, the foot switch 23 and press switch 24 are operated to connect the surface plate 2 and pressure plate 3, which are high frequency electrodes, to the high frequency generation source. Therefore, the workpiece material 30 on the surface plate 2 is strongly pressurized by the pressure plate 3 and is welded or fused by high frequency power. Note that when the cam 12 is acting on the toggle mechanism A as described above, the foot pedal 10 will not automatically return to its original position even if the foot pedal 10 is not depressed.

By the way, in the cam drive mechanism C that pushes the cam 12 as described above, as the pressure plate 3 achieves strong pressure, the pressure spring 20 begins to be compressed, and the cam drive plate 17 As it gradually approaches the cam support plate 14, the lower limit switch 26 eventually reaches the position of the dog 2.
It works with 7. Then, the motor 21, which had been rotating until now, stops and is reversed after a predetermined time has elapsed, so that the cam drive plate 17 begins to descend, causing the cam 12 to retreat in the direction opposite to arrow B. Therefore, the press arm 4 is moved back in the clockwise direction in the figure by the restoring spring 6, causing the pressure plate 3 to rise and return, and the toggle mechanism A to return to its original position, so that the foot pedal 10 is moved in the direction indicated by the arrow. Move back in the opposite direction. Note that when the cam drive plate 17 returns to its original position in this way, the dog 29 pushed by the plate operates the upper limit switch 28,
The motor 21 is stopped. Therefore, the pressure plate 3 stands still at a predetermined standby position above the surface plate 2, and the foot pedal 10 also stands still at the standby position in preparation for the next time.

As described above, the present invention combines a toggle mechanism operated by the foot pedal of a high-frequency welder with a cam mechanism and its drive mechanism, and allows the pressure plate to be lowered manually, and the pressure plate in the lowered position exerts a strong force. Since the pressurization is performed by mechanical force, the present invention has the advantages seen in foot-operated press devices, namely, the pressure plate can be lowered quickly, and the surface plate can be lowered quickly. While taking advantage of the fact that it is easy to align the workpiece material on the machine, it is possible to easily apply strong pressure using the pressure plate, which greatly reduces the required labor and greatly prevents worker fatigue. I can make it seem possible,
Therefore, it is expected that the operability of the high frequency welder will be greatly improved and the work efficiency will be greatly improved.

[Brief explanation of the drawing]

The figure is a side view showing an embodiment of the present invention. 2... Surface plate, 3... Pressure plate, 4... Press arm, 7... Toggle link, 9... Toggle rod, 10... Foot pedal, 12... Cam, 13
...Cam follower, 15...Cam drive shaft, 17
...Cam drive plate, 21...Motor, A...Toggle mechanism, B...Cam mechanism, C...Cam drive mechanism.

Claims (1)

[Scope of utility model registration request] A pressure plate is provided at the tip of a press arm pivotally supported on a support shaft, and the arm is provided with a restoring spring that acts in a direction to move the pressure plate away from the corresponding surface plate. and a foot pedal for moving the arm in the direction of bringing the pressure plate closer to the surface plate, a toggle mechanism comprising a toggle link whose intermediate part is pivoted on a support shaft and a toggle rod connected to the working end of the link. In the press device, a cam follower constituting a cam mechanism in relation to a wedge-shaped cam provided on a cam support plate is pivotally supported by a part of the toggle mechanism, and the cam is equipped with a mechanical drive source. The cam drive mechanism is configured to move forward and backward relative to the cam follower, and when the cam advances a certain length in the same direction as the operation of the pedal and presses the cam follower, the pressure plate and the surface plate are respectively moved. A press device for a high frequency welder, characterized in that it can be connected to a high frequency generation source.