JPS63149079A - Arc discharging device - Google Patents

Abstract

PURPOSE:To stably cause the necessary arc in the necessary state by forming the concentration point of a high density current at the tip part of an arc electrode and by concentrating a heating thereon. CONSTITUTION:When the arc power source circuit is turned on a high current is passed to large diameter tungsten bars 15b, 15c (return path). The high current is shunted from the large diameter tungsten bar 15a to small diameter tungsten bars 15b, 15c, a high heating is first caused by a neck 15r and the high current is second passed in concentration to a small diameter branch point. The whole arc electrode 15 body is heated by the high current and the calorific power is large at the three points where it flows in concentration. These three points are located around the tip 15t of the arc electrode 15. An arc discharging is thus caused between the concentration point or its vicinity and a nozzle member and since the tip 15t of the arc electrode is nearest to the nozzle member and close to the concentration point, a plasma is projected toward the main electrode from the opening 19b of the nozzle member 19. An arc discharging is caused between the nozzle member 19 and main electrode by this plasma.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to thermal processing such as welding, cutting, and heating using arc discharge, and in particular to an arc for starting arc ignition for starting thermal processing. This invention relates to a discharge device. [Prior Art] For example, in a welding torch, plasma torch, etc., electric discharge is generated between at least one discharge main electrode and the workpiece or another electrode, and processing is performed using heat generated by the electric discharge or plasma. In processing torches for welding, cutting, thermal spraying, or heating processing of target materials, it is necessary to ignite arc discharge. A high-frequency ignition method that applies a high-frequency high voltage between them to cause dielectric breakdown between them and generates an arc discharge, or a high-frequency ignition method that generates a contact spark by bringing the main discharge electrode into contact with the workpiece material and then discharging it. The arc discharge for machining is ignited by a contact ignition method in which the main electrode is separated from the workpiece and the contact spark discharge is transformed into an arc discharge.

For example, arc processing, in which the workpiece is processed by heating, welding, cutting, thermal spraying, etc., using arc discharge.For example, non-consumable electrode type arc welding is characterized by using arc and welding using an inert gas as a shielding gas. Since the total bending is shielded from the atmosphere, the arc is extremely stable, a smooth bead is obtained, and impurities do not enter the weld metal. In other words, high quality and clean beads can be obtained.
It is widely used for high-quality welding of thin plates and root pass welding of multilayer welding of thick plates.

However, in the conventional high-frequency ignition method, the high-frequency voltage required to start the arc is large, which generates high-power electromagnetic noise, which can damage various peripheral electronic devices such as microcomputers built into automatic welding equipment. They may malfunction or be damaged, and it is necessary to take measures such as using a special noise filter to deal with this type of high-frequency, high-power noise. Furthermore, since the measuring device connected to the arc power supply circuit is damaged during high-frequency ignition, there is a problem that the measuring device cannot be easily connected to the welding electric circuit. In particular, in AC welding, it is necessary to start arc discharge for restriking every AC half wave, and therefore there is a problem in that high frequency and high power noise is often generated.

In addition, in the conventional contact ignition method, arc discharge may fail to start depending on the shape of the tip of the discharge electrode, and in AC welding, the arc may fail when switching to an AC half wave, resulting in loss of arc stability. There are things that happen. A restriking operation every AC half wave is not possible.

Due to these factors, it has been difficult to automate the process using precision equipment such as welding robots and to control welding phenomena using precision measuring equipment, especially in the non-consumable electrode type arc welding method. A touch ignition method was developed to improve this problem, but the excessive current generated during a short circuit (touch) causes wear and tear on the tungsten electrode, such as melting and deformation, significantly shortening the electrode life and sometimes making welding impossible. It can be difficult. For the non-consumable electrode type arc welding method, which is characterized by high-quality welding with a stable arc, electrode wear that leads to arc instability is a fatal drawback.

Similar problems have been pointed out in the ignition of non-consumable electrode arcs for cutting, non-consumable electrode arcs for thermal spraying, and non-consumable electrode arcs for heat treatment.

The present invention provides an easy and highly stable ignition process for the above-mentioned machining torch without substantially generating high-power, high-frequency noise during ignition, and for non-consumable electrode type arc discharge machining. There is no electrode wear caused by one firing, and by eliminating the influence of high frequency noise, it prevents malfunctions or damage to peripheral measuring equipment, etc.
The purpose is to improve the above-mentioned problems.

[Means for solving problems]

In order to improve the above-mentioned open point, the inventors of the present invention proposed a plasma injector for generating ignited plasma using a filament electrode in a processing torch.
71139 and Japanese Patent Application No. 61-165295), he also invented a non-consumable electrode type arc machining device in which a filament electrode is opposed to the workpiece and arc discharge for machining is generated between the filament electrode and the workpiece. (Special application 1986-
No. 274575). Both of these cause the filament electrode to generate heat.

Ignite plasma or processing arc. Since it is neither high frequency ignition nor contact ignition, the above-mentioned conventional problems are greatly improved. However, in these methods, the filament electrode for starting the arc discharge is a hairpin-shaped conductor made by bending a tungsten wire into a ■ or U shape, and its tip (the bent part) is connected to the arc discharge electrode of the processing torch or the workpiece. However, the filament electrode as a whole generates heat and the stability of the arc generated from the bent portion is slightly inferior to that of the normally used rod-shaped electrode. As a result, in the case of the ignition plasma generator, there is a problem in that the time from starting the ignition plasma to ignition varies.

The present invention relates to an improvement of an arc ignition device using such a filament, and in addition to the above-mentioned objects, the present invention further includes the following steps to shorten the time from filament heating to arc generation and reduce variations. The arc electrode has a high-density current concentration point at the tip facing the other conductor that generates arc discharge, and the concentration point, a current forward path to the concentration point, and a current return path from the concentration point. It shall be one continuous piece.

[Effect]

According to this, the entire arc electrode generates heat when electricity is applied to it, but since the current density and resistance value are high at the concentrated point, the highest amount of heat is generated at the concentrated point,
The concentration point has the highest temperature. As a result, the temperature at the tip of the arc electrode also rises, and an arc is generated between the arc electrode and the other conductor.

Even if an arc first occurs between the concentration point and the other conductor, it immediately moves from the concentration point to the tip of the arc electrode. Therefore, the initial arc from the arc electrode is generated quickly and stably, and since the arc is essentially located at the tip, the wear caused by the arc at the concentrated point (small diameter point) is greatly reduced, and the life of the arc electrode is extended. This increases the length of time and maintains stable heat generation characteristics. Initial arc generation is stabilized and variations in generation timing are reduced.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. This embodiment is a DC consumable electrode type arc welding torch. In Figure 1,
1 is a DC arc welding power source with constant voltage characteristics,
The negative side of the output end is connected to the tungsten electrode (referred to as the main electrode for discharge or less) 2 in the welding torch 7, and the positive side of the output end is connected to the workpiece (base material) 3 to be welded. A welding electric circuit 8 is formed by a welding power source 1, a main electrode 2, and a base material 3. An arc generator (plasma injector in this example) 13 for arc triggering is arranged near the main electrode 2, and arc discharge power supply circuit 10 for triggering is arranged.
The large diameter conductor 15a of the arc electrode 15 of the arc generator 13 is connected to the cathode side of the nozzle member 19 of the arc generator 13.
is connected to the anode side, the power supply circuit 10 and the arc generator 1
The nozzle member of the arc generator 13 is connected to the base material 3. 4, the nozzle member 1 is set with the nozzle member 19 at the same potential as the base material 3.
9 and the first electrode 15 to the main electrode 2, and when the parenthetical plasma causes discharge breakdown between the nozzle member 19 and the main electrode 2, the resulting discharge current is limited and this discharge is stopped. This current-limiting resistance is used to promote the movement of the breakage toward the main electrode 2 and the base material 3, and to substantially prevent a main arc from occurring between the main electrode 2 and the nozzle member 19.

When the arc power source 1 is turned on, the main electrode 2 ( An electric field is formed toward the cathode), and in this state, the shielding gas Gim is supplied to the shielding member 6, and the plasma gas Git is supplied into the arc generator 13.In the following explanation, the description of the plasma gas will be omitted)1 point When the arc plasma power supply circuit 10 is turned on and the output of the heating power supply circuit 30 is turned on, the tip of the arc electrode 15 generates heat, causing discharge between the arc electrode 15 and the nozzle member 19 of the arc generator 13, and ignition. Plasma is sent toward the main pole 2, and the positive ions in the ignited plasma are accelerated by the electric field and collide with the main electrode 2, increasing the temperature of the collision part and moving from the main electrode 2 to the arc generator 13. An arc discharge is generated toward the nozzle member 19, and this arc discharge instantly transfers between the main electrode 2 and the base material 3. That is, a welding arc, that is, a main arc is ignited between the main electrode 2 and the base metal 3.

When a main arc is generated, the arc current is detected by the arc ignition detector 26, and the main electrode 2 is driven by the motor controller 38 via the main electrode drive motor under predetermined conditions.

In igniting the main arc as described above, the ability of the ignition plasma generation circuit 28 to generate a low current ignition plasma of about 10 A is sufficient for ignition of the main arc. Moreover, since the gas required to generate the ignition plug is only plasma gas and no shielding gas is required, the arc generator 13 can be miniaturized.

FIG. 2a shows an enlarged cross-section of the arc generator 13. The arc electrode 15 is a large diameter tungsten rod 15 with a sharp tip.
a, and thin-diameter tungsten rods 15b and 15c branched from the large-diameter tungsten rod 15a at the tip,
These legs are fixed to the base 14. The large-diameter tungsten rod 15a has a small-diameter neck 15r formed at the rear of the branch with respect to the tip, and the five-branch portion of the small-diameter tungsten rods L5b and 15c has the smallest diameter.

The rear end of a cylindrical shield member 17 is fixed to the base, and a nozzle member 19 is attached to the periphery of the tip opening 17a.
The rear end of is fixed. The nozzle member 19 is cup-shaped and has an opening 19b at its bottom.

A pipe joint 18 having a plasma gas inlet 18a is fixed to the shield member 17.

FIG. 2b shows the configuration of the heat generating power supply circuit 30. This power supply circuit 30 includes a three-phase converter 31 having drooping characteristics, a controllable reactor 32, a three-phase rectifier circuit 33, a power storage circuit 34. It is composed of a heating switch 35 and a full-wave rectifier circuit 37.

By adjusting the current value flowing through the current value control coil of the controllable reactor 32 with the variable resistor of the full-wave rectifier circuit 37,
The output current value of the phase rectifier circuit 33 can be adjusted.

Normally, the switch 35 is open and no current flows through the arc electrode 15.

As shown in FIG. 2b, when the switch 35 is open, the rectifier circuit 33 passes the capacitor C1 through the low resistance R1.
is being charged. In this state, arc power supply circuit 1 (
1) is turned on, the shielding gas Gim is supplied to the torch 7, the plasma gas Git is supplied to the pipe joint 18, and the trigger arc discharge power supply circuit IO is turned on, and the switch 35 is closed. , capacitor C1 is
Low resistance R2, switch 35. Large diameter tungsten rod 15
a (outbound), small diameter tungsten rod 15b.

C (return path), high current flows from the three-phase rectifier circuit 33 through low resistance R1, R2, and switch 35 to large diameter tungsten rods 15a (outward path) and small diameter tungsten rods 15b, c (return path). flows to

This high current is divided from the large-diameter tungsten rod 15a to the small-diameter tungsten rods 15b and 15c, and first, high heat is generated at the neck 15r, and second, the high current is concentrated at the introduction diameter branch point. flows. Although the entire arc electrode 15 generates heat due to the high current, the amount of heat generated is large at three points where the current flows concentratedly. These three points are located around the tip 15t of the arc electrode 15. This causes an arc discharge between the concentration point or its vicinity and the nozzle member 19, and since the tip 15t of the arc electrode 15 is closest to the nozzle member 19 and is also close to the concentration point, the arc discharge immediately Moving to the tip 1st of the electrode 15 and the opening 19b of the nozzle member 19, the nozzle member 19
Plasma is injected from the opening 19b toward the main electrode 2 (FIG. 1).

This plasma first generates an arc discharge between the nozzle member 19 and the main electrode 20, but the high current flowing through the nozzle member 19 is limited by the resistor 4. A main arc is generated between the main electrode 2 and the base material 3 using this arc discharge as a trigger. Once the main arc is generated, plasma power supply circuit 10 is turned off and switch 35 is returned to open.

Here, when the switch 35 is closed, the large diameter conductor 15a
The current flowing through the small-diameter conductors 15b and 15c will be explained. When the switch 35 is closed, the capacitor C1t resistor R2
A time constant circuit is constituted by the resistors of the arc electrode 15, and the capacitor c1 is discharged with a time constant determined by these electrical values, and the discharge current (heating current) shows a peak waveform. Note that the resistances of the resistor R2 and the arc electrode 15 change due to the heat generated by them due to energization, so one time constant is not constant during one heat generation energization. After the discharge starts, the capacitor C
After the voltage of the first voltage drops to a certain value, the rectifier circuit 33
Current flows through the electrodes. This is because there is a voltage drop across the resistor R1. When the voltage of capacitor C1 falls below a certain value, rectifier circuit 33 charges capacitor C1 through resistor R1, so if switch 35 remains closed, only three-phase rectifier circuit 33 is connected to arc electrode 15. It becomes a state where current flows. The current value at this time is determined by the resistances of R1, R2, the switch 35, and the arc electrode 15. Therefore, the capacitor c1 supplies an initial start-up current (flash current) to the arc electrode 15, thereby shortening the time from the application of the heating current to the generation of the main arc. Further, it is useful for reducing the current capacity of the circuit up to the three-phase rectifier circuit 33. Note that the resistor R3 is a resistor with a relatively large resistance value for discharging the residual charge in the capacitor C1 for safety reasons when the power is turned off.

FIG. 3a shows a modified example of the filament power supply circuit 30. In this, from the three-phase rectifier circuit 33, a low resistance R1
A current constantly flows through the arc electrode 15 through the relatively high resistance R4, thereby causing the arc electrode 15. In particular, the neck 15r and the branch point are always generating heat (preheating) with a relatively low amount of heat, and during this time, the capacitor C1 is being charged. The switch 35 is closed in conjunction with or in synchronization with an on switch (not shown) of the plasma power supply circuit 10. When the switch 35 is closed, the capacitor C1 superimposes on the preheating current and flows to the arc electrode 15, which temporarily increases the amount of heat generated at the neck 15r and the branch point.
Arc discharge occurs between the 5r1 branch point or the vicinity thereof and the nozzle member 19, and since the tip 15t of the arc electrode 15 is closest to the nozzle member 19 and is close to the contact point, the arc discharge immediately 15 and the opening 19b of the nozzle member 19, and the plasma is injected from the opening 19b of the nozzle member 19 toward the main electrode 2 (FIG. 1). When the plasma power supply circuit 10 is turned off in response to the occurrence of the main arc, the switch 35 is opened and the capacitor C1 is charged.

When using this filament electrode circuit 30, since the arc electrode is preheated, it is easier to close the switch 35 before the electrode 15-
The time required to generate an arc between the nozzle members 19 is short. In other words, the filament power supply circuit 30 may have a small capacity that can supply the preheating current so that the arc can be generated quickly.

In addition, when the capacitance is extremely small, the charging current to the capacitor C1 is also applied between R1 and R2 for preheating f! A resistor is inserted to limit the flow to a small value.

A modification of the filament power supply circuit 30 shown in FIG. 3a is shown in FIG. 3b. As shown in Figure 3b.

The switch 35 is inserted between the resistor R2 and the capacitor C1 as a changeover switch, and the switch 35 is used to switch the capacitor C1.
Charge/discharge may be switched. In this example as well, when the plasma power supply circuit 10 is turned off in response to the occurrence of the main arc, the switch 35 is opened and the capacitor Cm is charged.

Another modification of the filament power supply circuit 30 is shown in FIG. 3c. In this, a switch 3 is used to switchly connect the arc electrode 15 to the preheating circuit resistor R4 and the capacitor C1.
5 and a switch 36 that opens and closes between the charging circuit resistor R1 and the capacitor C1 are used as changeover switch means. In this example.

When the plasma power supply circuit lO is off, switch 35.3
6 is the illustrated state, a preheating current flows through the arc electrode 15, and both of them generate heat. However, the calorific value is low. Capacitor C1
is charged. When the on switch (not shown) of the plasma power supply circuit IO is closed (power is turned on), the switch 35 is switched to connect the capacitor C1, and the switch 36 is switched to open, thereby connecting the capacitor C1 to the arc electrode. 15, the arc electrode 15 and the nozzle member 1
9, an arc (ignited plasma) is generated. Switches 35 and 36 return to the illustrated state in conjunction with or in synchronization with plasma power supply circuit IO being turned off, capacitor C1 is charged, and after charging is completed, sufficient preheating current is supplied to arc electrode 15. In this example, while an arc is being generated at the arc electrode 15 (power supply circuit 10 is on), the arc electrode 15
is separated from the preheating circuit and charging circuit. Therefore, it will be described later. This is advantageous when the arc electrode 15 is used as a machining arc (main arc) electrode (for example, as shown in FIG. 4). This is because the arc electrode 15 is used as a machining arc electrode.

A machining arc power supply circuit is connected to the arc electrode 15 (
For example, the plasma power supply circuit 10 in FIG. 3c is changed to the arc power supply circuit 1).

FIG. 4 shows an embodiment in which the arc discharge device of the present invention is used for non-consumable arc welding. The arc generator 13 shown here is the arc generator (plasma injector) 13 shown in FIG. 2a.
The nozzle member 19 is omitted, and the arc electrode 15 faces the base material 3 to be processed. That is, the second
This is an embodiment in which the nozzle member 19 in figure a is replaced with the base material 3. An arc power supply circuit 10 having DC drooping characteristics is connected to the arc electrode 15 and the base material 3 instead of the plasma power supply circuit, and the arc electrode 15 has a large diameter tungsten 15a and a branched small diameter tungsten 15b.

15c, the filament power supply circuit 30 (for example, the 3rd c
(The configuration shown in the figure) is connected.

When the arc power source 10 is turned on while inert gas is being supplied as a shield gas to the tip (lower end in the figure) of the arc electrode 15 through the opening 18a of the shield member 17, the filament power source circuit is activated in conjunction with or in synchronization with this. 30
The switches (35, 36) in FIG. 3C are switched to discharge, and the arc electrode 15 generates heat, particularly at the current concentration points (neck 15r and branch points). As the temperature of this concentration point increases, the energy possessed by the electrons at the concentration point increases, and the sum of this and the energy received from the electric field applied by the arc discharge power supply circuit 10 causes thermoelectrons to be emitted from the concentration point. When the working arc is excited to the energy level shown in FIG. While the processing arc is ignited, the arc electrode 15 generates heat due to the arc current, and when the processing arc stops (for example, the circuit 10 is turned off due to the completion of welding at a certain point), the filament power supply circuit 30 (third c. The switch (35°36) shown in the figure is for preheating and
Switching to charging, the arc electrode 15 is preheated and energized, and the capacitor (C1) is charged. Therefore, in this example (an example in which the power supply circuit 30 shown in FIG. 3c is used), the arc electrode 15 continues to generate heat even during the pause period between the end of welding at one location and the start of welding at another location. do. Therefore, the flash current due to capacitor (C+) may be relatively low.

Although the two embodiments shown in FIGS. 1 and 4 have been shown above, namely the arc generator of the consumable electrode type plasma arc welding torch and the non-consumable type arc welding torch, the present invention is not limited to these. , AC, DC, consumable electrode type, non-consumable electrode type,
Plasma welding torch.

Plasma cutting torch, plasma heating torch, arc welding torch, arc cutting torch, arc heating torch, etc.
It can be used as an arc generator or a machining arc generator in an arc discharge machining device that uses high current arc discharge as a machining means.

Next, a modification of the arc electrode 15 will be explained.

In the modification shown in FIG. 5a, the arc electrode 15 is ν-shaped. That is, the arc electrode 15 shown in FIG. 2a is omitted from the small diameter tungsten bar 15c, and a small diameter portion 15r2 is further formed at the branch point.

In the modification shown in FIG. 5b, the V-shaped (or U-shaped) bent end 15t has the smallest diameter 15r to maximize the electrical resistance there. In this example, the most extreme 15t has the highest amount of heat generation.

In a mode in which a machining arc is generated directly from the arc electrode 15 (for example, as shown in FIG. 4), the tip 15t of the arc electrode 15
arc electrode 1 because it is easily worn out by the machining arc.
5 is a non-consumable arc electrode material having the shape shown in FIG. 2a or FIG. 5a, so that the distance between the tip of the tip 15t and the high current concentration point (15r and the branch point) is slightly longer. When the arc electrode 15, especially its tip 15t, has low arc wear resistance, for example, in the ν-type embodiment as shown in FIG. 5a, a conductor piece 15t with high arc resistance is attached to the tip as shown in FIG. 6a. In the V-shaped embodiment shown in FIG. 5b, the sixth
As shown in Figure b, a conductor piece 15t with high arc resistance is attached to the tip. In the embodiment shown in FIG. 6b, in order to prevent the conductor piece 15t from falling off, a groove is formed in the conductor piece 15t, the tip of the arc electrode 15 is inserted therein, and a screw is attached to the conductor piece 15t to cross this groove. ing. Also in the embodiment shown in FIG. 6a, it is preferable to screw the conductor piece 15t.

Furthermore, in this case, it is more preferable that the conductor pieces 15t are integrated by joining or integrally molding.

〔Effect of the invention〕

As explained above, in the arc discharge device of the present invention, a high-density current concentration point is formed at the tip of the arc electrode and heat generation is concentrated there, so that the arc is generated from there and immediately transition to the tip. There are no problems associated with conventional high-frequency triggers, and there are also no problems such as deformation or wear and tear of the arc electrode, which occurs in the case of conventional contact arc generation.

It becomes possible to stably generate a desired arc in a desired manner, and stability in arc generation is achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2a is an enlarged sectional view of the arc generator 13 shown in FIG. 1. FIG. 2b is an electrical circuit diagram showing the structure of the filament power supply circuit 30 shown in FIG. 1. FIGS. 3a, 3b, and 3c are electrical circuit diagrams showing only the modified parts of a modified example of the filament power supply circuit 30, respectively. FIG. 4 is a sectional view showing another embodiment of the present invention. 5a, 5b, 6a and 6b are cross-sectional views showing modifications of the arc electrode 15 shown in FIG. 2a. 1: Arc power supply circuit 2: Main electrode 3: Base material 4
3 in the figure: mating conductor) 4: Current limiting resistor 6: Shield member 7: Welding torch 8: Welding electric circuit 10: Ignition plasma power supply circuit (arc discharge power supply circuit) 13: Arc generator 15: (Arc t 15a: Large diameter conductor (current forward path) 15b, c: Small diameter conductor (electrical suspension path) 1
st: tip, conductor pieces 15r, 15rl, 15r2: (high-density current concentration, ω17: shield member (shield member) 17a: opening (opening facing the other conductor) 18: pipe joint 18a: opening for introducing the casing opening) 19: Nozzle member (other conductor) 19b: Plasma injection port 26: Arc, α detector 27: Electrode tip 28: Ignition plasma generation circuit 29: Feeding roller

Claims (10)

[Claims] (1) A high-density current concentration point is provided at the tip facing the other conductor that generates arc discharge, and the concentration point, the current forward path to the concentration point, and the current return path from the concentration point are integrated. a continuous arc electrode; a shield member having an opening that surrounds at least a portion of the arc electrode and faces the other conductor, and an opening for introducing gas into the interior; supplying heating current to the current forward path and the current return path; and an arc discharge power supply circuit that supplies arc discharge power between the arc electrode and the other conductor. (2) The arc discharge device according to claim 1, wherein the arc electrode has a fork shape having a thick conductor at the center and two thin branch conductors branching symmetrically at the tips thereof. (3) The central thick conductor has a narrow diameter neck on the rear side of its tip with respect to the branch part, and the branch conductor has the smallest diameter at the branch part; arc discharge according to claim (2). Device. (4) The arc discharge device according to claim 1, wherein the arc electrode is a v-type having a thick conductor and one thin branch conductor branched at the tip thereof. (5) The arc discharge device according to claim (4), wherein the thick conductor has a narrow diameter neck on the rear side of its tip with respect to the branch portion, and the branch conductor has the thinnest diameter at the branch portion. (6) The arc discharge device according to claim 1, wherein the arc electrode has a V-shaped or U-shaped bent shape, and the bent portion is a hairpin-shaped conductor with a small diameter. (7) The arc electrode has an arc-resistant conductor piece at the tip of the claim (1), (2), (3), (4), (5) or The arc discharge device according to item (6). (8) The heating power supply circuit includes a capacitor, a charging circuit for charging the capacitor, and a switch means for discharging the charge of the capacitor to a heating element.
Section 1), Section (2), Section (3), Section (4), Section (5)
) or (6). (9) The heat generating power supply circuit includes a capacitor, a charging circuit that charges the capacitor, a switch means that discharges the electric charge of the capacitor to the heat generating element, and a circuit that energizes the heat generating element even when the switch means is open. Claim No.
Section 1), Section (2), Section (3), Section (4), Section (5)
) or (6). (10) The heating electrode circuit includes a low current supply path for supplying a low current to the heating element, a capacitor, a charging circuit for charging this capacitor, and a heating element connected to the low current supply path in the first state. and connecting the capacitor to the charging circuit, and switching means for switchingly connecting the heating element from the low current supply path to the capacitor in a second state to isolate the capacitor from the charging circuit. Section (2)
Paragraph, Paragraph (3), Paragraph (4), Paragraph (5) or Paragraph (6)
The arc discharge device described in Section 1.