JPH0757492B2 - High frequency vinyl processing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to welding and molding of vinyl by heating the vinyl by applying a high-frequency current between the upper and lower molds while pressing the vinyl with the upper mold and the lower mold. Related to the device.

[0002]

2. Description of the Related Art In general, this processing operation involves placing a vinyl to be welded on a lower die, lowering the upper die to keep the vinyl under pressure between the dies, and then turning on a high frequency oscillator. When the vinyl is heated to oscillate, and the vinyl is pressure welded or molded, the high frequency oscillator stops oscillating, and after a while, cool the vinyl to a temperature at which it does not deform, and then press the upper mold. The procedure is as follows: ascend and take out the welded or molded vinyl.

In the conventional high-frequency vinyl automatic processing device,
In general, press the start button to lower the press operated by air or a motor, and when the press falls and the vinyl is sandwiched between the dies, the power circuit of the high frequency oscillator closes,
A meter relay inserted in the DC circuit of a high-frequency oscillator,
When the timer inserted in the power supply circuit works at the same time and the meter relay reaches the set current value or the timer reaches the set time, the power supply circuit of the high frequency oscillator is opened, and then the press rises after the time set in the cooling timer has passed. It is like this.

Generally, a high-frequency vinyl processing device has a structure shown in FIG.
As shown in, a high frequency oscillator 1 using a high frequency triode 2 is used, and is connected to a commercial power supply circuit 4 via a transformer. The upper mold 13 and the lower mold 14 are connected to the high frequency oscillator 1 via a tuning circuit 11. Depending on the vinyl 15 to be processed and the upper mold 13 and the lower mold 14 used for the processing, the maximum electric power for appropriately heating and processing the vinyl 15 differs depending on each vinyl and the mold to be used. Therefore, the tuning circuit 11 is first tuned. The container 12 is adjusted so that the electric power can be processed so that the vinyl does not cause dielectric breakdown.

When a high-frequency current is applied to vinyl, as it is heated and its temperature rises, the dielectric loss increases and the passing current increases. Along with this, the current flowing through the DC circuit of the high frequency triode 2 also increases. Therefore, the meter relay 3 is inserted into the DC circuit of the high frequency triode 2 so that the meter relay 3 operates at a current value which is considered to allow appropriate welding or molding to open the power supply circuit. .

When the meter relay is actuated to open the power supply circuit, excessive processing or insufficient processing may occur due to variations in the thickness and material of vinyl. Also, even if the current value of the meter relay is set so that it can be processed properly when the temperature of the vinyl or mold is low, such as when starting work in the morning, the vinyl will be warmed by the rising temperature. When the temperature of the mold rises due to the continuation of work, the resistance of the mold to the high-frequency current passing through becomes large, and the current decrease due to the resistance becomes larger than the current increase due to the temperature rise of the vinyl, and the meter relay is set. If the power is closed until the proper processing temperature is reached before the set current value and the set current value of the meter relay is reached,
Since it is excessively welded or processed, it is necessary to gradually reduce the set current value of the meter relay.

On the other hand, since the timer for opening the power supply circuit acts as a safety device, it is necessary to set the timer longer than the operating current value after the current flows through the meter relay. The smaller the current value, the shorter the set time of this timer must be adjusted. The adjustment of the meter relay and the timer is different in winter and summer, and it is different at the start of work and after continuing work, and before and after lunch break, so you must always adjust the meter relay, vinyl Proper welding or molding required years of skill and intuition.

In order to solve this problem, a temperature sensor is provided in the mold, and when the detected temperature is within the proper temperature range,
It may be possible to disconnect the commercial power supply circuit. However, this method has a drawback that the device is expensive.

[0009]

SUMMARY OF THE INVENTION According to the present invention, at the start of work, the set current value of the meter relay is set and the set time of the timer is determined. It is an object of the present invention to provide a high-frequency vinyl processing device that does not require any change in the set current value or the set time and is inexpensive, requires no skill, and can be welded or molded in a constant state at all times.

[0010]

In order to achieve the above object, a high frequency vinyl processing apparatus provided by the present invention is inserted into an anode current circuit of a high frequency triode of a high frequency oscillator, and is slightly higher than the minimum current value required for proper processing. A meter relay that operates with a small set current value, a timer that is inserted in parallel with the commercial power supply circuit of the high-frequency oscillator, and that is operated when the set current value is reached by the meter relay, and a vinyl heating temperature that is appropriate by the timer. And a device for opening a commercial power supply circuit to the high-frequency oscillator when a set time for reaching the maximum temperature and the minimum temperature required for processing has elapsed. High frequency vinyl processing equipment.

When machining is performed using this apparatus, the set current value of the meter relay is set to be lower than the minimum current value that can be properly machined in the conventional work, for example, when the mold temperature is rising. Set a little smaller. Then,
In all cases, including the case where the mold temperature is low, the vinyl temperature does not reach the processing temperature range even when the set current value is reached, regardless of the time until the set current value is reached. However, after reaching this set current value, the temperature of the vinyl reaches the processing temperature range in a relatively short time. Therefore, according to the thickness of the material and the variation of the material, the vinyl will be heated within the range of the maximum temperature and the minimum temperature that can be properly processed, and the timer will be activated after the preset current value of the meter relay is reached By setting the set time of the timer up to, it is possible to always perform proper processing regardless of conditions such as mold temperature.

When starting work using a fixed vinyl and mold, the set current value of the meter relay that can be properly processed when the temperature of the mold and vinyl is the lowest is 1 A, for example.
At the time of, it is about 10% lower than this set current value, and it is set to 0.8A which is slightly lower than the conventional set current value, which is the lowest for proper machining during continuous machining, and the timer time is set. For example, 2 seconds. With this setting, when the temperature of the vinyl or mold is the lowest, it takes a long time to reach the set current value of the meter relay.
When the temperature reaches the minimum temperature within the temperature range that allows proper processing within a second, and the mold temperature and vinyl temperature are the highest,
Although it takes a short time to reach the set current value of the meter relay, it reaches the maximum temperature within the temperature range in which proper processing can be performed within 2 seconds set by the timer.

[0013]

1 shows an embodiment of the device of the present invention, in which a meter relay 3 is inserted in a DC circuit of a high frequency triode 2 of a high frequency oscillator 1. A commercial power supply circuit 4 connected to the high-frequency oscillator 1 via a transformer has a normally open contact 5 inserted in parallel with the transformer, and a circuit having the normally open contact 5 has a timer 6 inserted in series with the normally open contact 5. ing. The normally open contact 5 is closed by the meter relay 3. A normally closed contact 7 is inserted in series with the commercial power supply circuit 4. Therefore, when the meter relay 3 closes the normally open contact 5, the timer 6 operates, and after the time set in the timer 6, the normally closed contact 7 opens,
The commercial power supply circuit 4 of the high frequency oscillator 1 is turned off.

Further, in the commercial power supply circuit 4, a normally open contact 8 and a safety timer 9 are inserted in parallel with the circuit of the normally open contact 5 and the timer 6, and the normally open contact 8 is closed by the meter relay 3. It is like this. A normally closed contact 10 is inserted in series in the commercial power supply circuit 4, and the normally open contact 8 is closed by the meter relay 3 to operate the safety timer 9. After the time set in the safety timer 9, the normally closed contact 10 is closed. 10 is open. The time set in the safety timer 9 is set to be about 5 seconds longer than the maximum time from the activation of the meter relay 3 to the opening of the normally closed contact 7, and the safety device is provided when the meter relay 3 or the timer 6 is out of order. It was done.

In the above embodiment, the timer 6 directly opens the normally-closed contact 7 inserted in series with the commercial power supply circuit 4, but the timer 6 keeps the commercial power supply circuit 4 closed. The relay circuit may be opened and the commercial power supply circuit 4 may be opened. The same applies to the safety timer 9.

When processing vinyl using this apparatus, an expert sets the set current of the meter relay 3 at the start of work and sets the time of the timer 6, so that the worker can do the rest. You can work without adjusting 6.

[0017]

According to the present invention, it is possible to provide a high-frequency vinyl processing apparatus which can perform welding or molding in a constant state at low cost and without requiring any skill.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the device of the present invention.

[Explanation of symbols]

 1 High Frequency Oscillator 2 High Frequency Triode 3 Meter Relay 4 Commercial Power Circuit 5 Normally Open Contact 6 Timer 7 Normally Closed Contact 8 Normally Open Contact 9 Safety Timer 10 Normally Closed Contact 11 Tuning Circuit 12 Tuner 13 Upper Mold 14 Lower Mold 15 Vinyl

Claims (2)

[Claims] 1. In a high-frequency vinyl processing apparatus for welding or molding vinyl by applying a high-frequency current between molds sandwiching vinyl, the minimum required for proper processing is inserted into the anode current circuit of the high-frequency triode of the high-frequency oscillator. A meter relay that operates at a set current value slightly smaller than the current value, a timer that is inserted in parallel with the commercial power supply circuit of the high-frequency oscillator, and is operated when the set current value is reached by the meter relay, and vinyl heating by the timer. A high-frequency vinyl processing device comprising: a device for opening a commercial power supply circuit to the high-frequency oscillator when a set time for reaching a temperature within a range of a maximum temperature and a minimum temperature required for proper processing has elapsed. 2. The high-frequency vinyl processing according to claim 1, further comprising a safety timer operated by the meter relay inserted in parallel with the commercial power supply circuit, and a device for opening the commercial power supply circuit by the safety timer. apparatus.