JP6148567B2 - Electrostatic coating equipment - Google Patents

Description

  The present invention relates to an electrostatic coating apparatus including a spray gun and an electrostatic controller.

  For example, as a device for coating an object to be coated such as an automobile body, fine particles of paint sprayed from a spray gun for electrostatic coating are negatively generated by a DC high voltage generator (cascade) incorporated in the spray gun. 2. Description of the Related Art There is known an electrostatic coating apparatus that is charged to a high voltage and causes the charged paint particles to adhere to the surface of the object to be coated by electrostatic force acting between the object to be grounded (anode).

  The spray gun includes the DC high voltage generator, a paint valve, an air valve, a trigger, and the like. The electrostatic controller includes a control unit that performs overall coating control and various adjustments, an air flow switch that responds to air flow by opening the air valve, a power source unit that supplies power to the DC high voltage generation unit, and the DC high voltage controller. A high-voltage current detection circuit for detecting the current of the voltage generator is provided. The electrostatic controller and the spray gun are electrically connected by an electric cable having a power line and a signal line.

  When the operator operates the trigger of the spray gun, the paint valve and the air valve are opened, and the paint is discharged (sprayed) in the form of a mist. At the same time, the air flow switch is actuated so that the control unit activates the power supply unit and supplies power to the DC high voltage generation unit. This DC high voltage generator generates a high voltage to charge the sprayed paint fine particles with negative charges.

  In the electrostatic coating apparatus described above, various settings are performed on the electrostatic controller side. For example, the voltage of the DC high voltage generator is switched and set, or the air pressure is adjusted and set. For this purpose, an input operation means such as an operation switch is provided in the electrostatic controller (Patent Document 1).

Japanese Patent Laid-Open No. 5-184979 ([0011], [0026]) JP-A-6-328013

  By the way, the painting booth that performs the painting work with the spray gun and the control booth where the electrostatic controller is installed are separated or far away from each other. The worker had to go to the electrostatic controller one by one. In particular, the painting booth and the control booth are tens of meters apart, or the floors of the floor may be different up and down. In such a case, the working efficiency is particularly bad.

  On the other hand, there is one provided with an input operation means for turning on and off the DC high voltage generator near the spray gun (Patent Document 2). In this device, a branch portion is provided in an air supply pipe near the spray gun, and a manual open / close type air on / off valve is provided as an input operation means in the branch portion. The electrostatic controller is provided with an air pressure responsive switch, and the air pressure forward switch and the air on / off valve are connected by an air pressure transmission pipe.

  In the above-described configuration, when an operator manually opens or closes the air on / off valve, the air pressure change associated therewith is transmitted to the air pressure responsive switch on the controller side via the air pressure transmitting pipe. The air pressure responsive switch is turned on and off electrically. The controller changes the voltage of the DC high voltage by this on / off.

However, this configuration requires a complicated air open / close valve and air pressure responsive switch, and the air pressure transmission piping routed between the paint booth and the control booth does not have a bent portion in the middle. Need to be routed.
Therefore, an object of the present invention is to provide an electrostatic coating apparatus that can perform an input operation on the spray gun side and with a simple configuration.

  The invention of claim 1 includes a spray gun for electrostatic coating, which has a trigger and a DC high voltage generator, and sprays a paint charged in accordance with the operation of the trigger to be applied to an object to be coated. An electrostatic controller having a control unit that performs general control and various settings, and a power supply unit that supplies power to the DC high voltage generation unit, and electrically connects the electrostatic controller and the spray gun. A cable and input operation means for performing an input operation for setting or adjusting a predetermined control object, and the input operation means is provided in the vicinity of the spray gun in the cable and is magnetically responsive. A magnetically responsive part for generating an electrical signal and a magnet, and a responsive position for the magnet to magnetically react the magnetically responsive part to the spray gun and the magnet to the magnetically responsive part. Parts consist of a displaceably provided operating member and a non-responsive position which does not magnetically responsive, said controller controls the controlled object in response to an electrical signal which the magnetic responsive portion occurs.

  According to the above configuration, the electric signal generation state of the magnetically responsive portion differs when the operator switches the operation member provided on the spray gun between the responsive position and the non-responsive position. And a control part controls a controlled object according to an electric signal which a magnetic actuator generates. Therefore, input operations such as setting and adjustment of the control target can be performed on the spray gun side. Moreover, since the input operation means is composed of a magnetically responsive portion and an operation member having an electromagnet, the configuration of the input operation means can be simplified as compared with the conventional case.

  According to a second aspect of the present invention, the spray gun has a grip portion, and is detachably equipped with a cable attachment member for attaching the cable to the bottom portion of the grip portion, and the operation member is attached to the cable attachment member. It has been. According to this, since the operation member is attached to the cable attachment member of the spray gun, the operation member can be attached to the spray gun using the existing cable attachment member, and the cable attachment member can be attached to and detached from the grip portion. Therefore, the operation member can be easily attached to the spray gun. Further, since the response member of the input operation means is provided on the cable and the operation member of the input operation means is attached to the cable attachment member, the input operation means is provided in one unit composed of the cable and the cable attachment member. The positioning and assembly of the response member and the operation member are simplified.

According to a third aspect of the present invention, the operation member is provided so as to be displaceable between the responsive position and the non-responsive position in a lower region of the grip portion. According to this, it can avoid that an operator carelessly operates an operation member during a painting operation.
According to a fourth aspect of the present invention, the controlled object is an output voltage of a direct current high voltage generator. According to this, it is possible to control the output voltage of the DC high voltage generator by an input operation on the spray gun side, and accordingly, the output voltage is increased or decreased depending on the type of paint or the type of object to be coated. Or if you want to stop it.
According to a fifth aspect of the present invention, the magnetically responsive portion includes a reed switch. According to this, since the reed switch itself has a simple configuration and is small in size, it can be easily provided inside the cable.

  According to the present invention, an input operation can be performed on the spray gun side with a simple configuration.

1 is a side view of a spray gun according to a first embodiment of the present invention. Side view of the input operation device part of the spray gun 2 equivalent view with different operating members Perspective view of the input operation device part in the spray gun The rear view of the partial cross section seen from the arrow XX direction of FIG. Development view of the reed switch in the cable Cable cross section Diagram showing the electrical configuration, paint supply system, and air supply system of the electrostatic coating device Flow chart showing the control contents of the control unit Time chart for explaining the operation of each part The flowchart which shows the control content of the control part by 2nd Embodiment. Time chart for explaining the operation of each part FIG. 8 equivalent diagram according to the third embodiment Time chart for explaining the operation of each part

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG. 8, the electrostatic coating apparatus 1 includes a spray gun 2 and an electrostatic controller 3. As shown in FIG. 1, the spray gun 2 has a main body 2a. The main body 2a has a main body (barrel) 2b made of an electrically insulating synthetic resin and a grip 2c made of a conductive synthetic resin provided at the rear thereof. Further, a trigger 2d is provided on the main body 2b. Further, a pin electrode 2e and a nozzle 2f are provided at the tip of the main body 2b. An output voltage display LED 24 is provided at the rear end of the grip portion 2c.

Further, a cable attachment member 5 for attaching the cable 4 is detachably attached to the bottom of the grip portion 2c. An air supply pipe attachment member 7 for attaching the air supply pipe 6 is detachably attached to the bottom of the grip portion 2c. A holder 9 for holding the paint supply pipe 8 is provided below the grip portion 2c.
The spray gun 2 is provided with an input operation device 10 as input operation means. The input operation device 10 includes a reed switch 11 as a magnetically responsive portion and an operation member 12. As shown in FIG. 6, the reed switch 11 is embedded in the vicinity of the spray gun 2 in the cable 4.

  This cable 4 is a five-core cable, two of which constitute power supply lines 4a and 4b, another one constitutes a current detection signal line 4c, and the remaining two constitute signals for the reed switch 11. Lines 4d and 4e are formed. Each end of the reed switch 11 is connected to the ends of the signal lines 4d and 4e for the reed switch 11. A protective tube 4h is provided on the outer periphery of the connecting portion of the cable 4 with the spray gun 2.

The operation member 12 is attached to the cable attachment member 5 via a holder 13 and a support shaft 14 as shown in FIGS. The holder 13 is attached to the cable attachment member 5 so as to be substantially parallel to the cable 4 and directed downward of the grip portion 2c. An operation member 12 is attached to the holder 13 so as to be rotatable in the direction of arrow A and in the opposite direction. A magnet 15 is embedded in one surface side of the operation member 12 so as to be partially exposed, and an operation projection 12a is formed on a surface different from the surface where the magnet 15 exists.
As shown in FIG. 5, the operating member 12 exists in a lower region E of the grip portion 2 c and is provided in the lower region E so as to be displaceable between the responsive position and the non-responsive position. Yes.

  Now, in the state of FIG. 2, the operation member 12 is in a position (responding position) where the magnet 15 faces the reed switch 11. In this state, the magnetic force of the magnet 15 acts on the reed switch 11 and the reed switch. 11 is a switch closed (ON) (magnetically responsive). From this state, when the operation protrusion 12a of the operation member 12 is rotated in the direction of arrow A, the operation member 12 is displaced to the position (non-responsive position) shown in FIG. In the state shown in FIG. 3, the magnet 15 moves away from the reed switch 11, the magnetic force hardly acts on the reed switch 11, and the reed switch 11 is turned off (becomes a non-magnetic state). .

Next, the electrical configuration of the electrostatic coating apparatus 1, the paint supply system, and the air supply system will be described with reference to FIG.
The electrostatic controller 3 includes a control unit 16, a power supply unit 17, a power transmission current detection circuit 18, a high voltage current detection circuit 19, an operation determination circuit 20, and an air flow switch 21.
The spray gun 2 includes a DC high voltage generator 22, an LED drive circuit 23 as a display drive circuit, an LED 24 as a display, a paint valve 25 (paint supply system), and an air valve 26 (air supply system). .

The control unit 16 is mainly composed of a microcomputer having a CPU, a ROM, a RAM, and the like, and controls the overall electrostatic coating.
The power supply unit 17 includes an oscillation circuit 17a, a DC power supply 17b, two switching elements 17c and 17d, and an output transformer 17e.

  The output of the DC power supply 17b is connected to the power supply ground via the switching elements 17c and 17d on the primary side of the output transformer 17e. Specifically, the output terminal of the DC power supply 17b is on the positive side with respect to the ground potential by the output transformer 17e and the switching element 17c, and is negative on the ground potential by the output transformer 17e and the switching element 17d. It is connected to the.

  The switching elements 17c and 17d are constituted by semiconductor switches such as MOSFETs, for example, and the conduction state can be controlled by energization. The switching elements 17c and 17d are in a conductive state (on) when energized, and in a non-conductive state (off) when the energization is stopped, the on / off state is controlled by the oscillation circuit 17a and the control unit 16. . The control unit 16 outputs a command signal for controlling the energization time (ON time) of the switching elements 17c and 17d to the oscillation circuit 17a. The oscillation circuit 17a generates a pulsed drive signal based on this command signal and outputs it to the switching elements 17c and 17d.

  The switching elements 17c and 17d change their energization state in conjunction with the drive signal output from the oscillation circuit 17a, and switch the output of the DC power supply 17b to the positive side or the negative side. The drive signal is output at a timing at which the ON states of the switching elements 17c and 17d do not overlap with each other. The switching elements 17c and 17d are alternately turned on / off according to the pulse width of the drive signal, whereby the output transformer is output. A low-voltage AC voltage Vac corresponding to the output voltage of the DC power supply 17b is generated on the secondary side of 17e.

  Here, the control unit 16 outputs a command signal (first output voltage command and second output voltage command) for changing the voltage of the DC power supply 17b to the DC power supply 17b, whereby the AC voltage is changed. The voltage value of Vac can be changed to the first AC voltage Vac1 and the second AC voltage Vac2 (Vac1> Vac2). The AC voltage Vac (Vac1, Vac2) is supplied to the DC high voltage generator 22 (so-called cascade) via the power supply lines 4a, 4b of the cable 4. The first AC voltage Vac1 is a voltage for setting an output voltage Vdc of a DC high voltage generator 22 described later to a first DC voltage Vdc1, for example, −60 kV, and the second AC voltage Vac2 is a DC high voltage described later. This is a voltage for setting the output voltage Vdc of the voltage generator 22 to the second DC voltage Vdc2, for example, −30 kV. That is, the control unit 16 outputs the first output voltage command, thereby causing the output voltage Vdc of the DC high voltage generation unit 22 to be the first DC voltage Vdc1 (−60 kV) and the second output voltage command. By outputting, the output voltage Vdc of the DC high voltage generator 22 is set to the second DC voltage Vdc2 (−30 kV). Further, the control unit 16 also outputs an output stop command. When this output stop command is output, the power supply unit 17 stops the output of the AC voltage Vac (the output of the DC high voltage generating unit 22). The voltage Vdc is set to 0 kV). The AC voltage Vac is changed by outputting to the oscillation circuit 17a command signals (first output voltage command and second output voltage command) that change the energization time (ON time) of the switching elements 17c and 17d. You can also These commands are output in response to an electrical signal (switch signal) generated by opening / closing the reed switch 11 as described later.

  The transmission current detection circuit 18 detects the AC voltage Vac output from the output transformer 17e and supplies it to the control unit 16. The control unit 16 controls the power supply unit 17 based on the AC voltage detected by the transmission current detection circuit 18 so that the AC voltage becomes a predetermined voltage (Vac1 or Vac2) set at the present time.

  The high-voltage current detection circuit 19 is connected to the DC high voltage generation unit 22 via the current detection signal line 4 c of the cable 4 and detects a current flowing through the DC high voltage generation unit 22. The current detection result is given to the control unit 16, and the control unit 16 stops the supply of the AC power supply Vac when the current detection result is an excessive current value.

The operation determination circuit 20 is connected to the reed switch 11 through signal lines 4 d and 4 e of the cable 4. That is, the operation determination circuit 20 is supplied with the switch signal (switch open signal and switch close signal) of the reed switch 11 through the signal lines 4 d and 4 e of the cable 4.
When the reed switch 11 is in the switch open state (non-responsive state, switch open signal output state), the operation determination circuit 20 sets the output to a low level, and from this switch open state to the switch closed state (responsive state, switch close signal output). When the state changes to (state), a high level closing determination signal S20 is output.

  The closing determination signal S20 is given to the control unit 16. In response to the input of the closing determination signal S20, the control unit 16 sets the output voltage Vdc of the DC high voltage generation unit 22 to the first DC voltage Vdc1 (−60 kV), the second DC voltage Vdc2 (−30 kV), and 0 kV. (Output stop)) (to be described later).

The air flow switch 21 operates when air flows through the air piping path, and supplies an air flow detection signal, that is, a trigger operation detection signal to the control unit 16.
The DC high voltage generator 22 in the spray gun 2 includes a step-up transformer 22a, a voltage doubler rectifier circuit 22b, and an output resistor 22c, and a DC voltage having a magnitude proportional to the AC voltage Vac supplied from the power supply unit 17. Is generated and output. That is, the AC voltage Vac input to the step-up transformer 22a is boosted and then boosted and rectified by, for example, a Cockcroft-Walton type voltage doubler rectifier circuit 22b, and converted to a DC high voltage. The voltage doubler rectifier circuit 22b changes the direction of a diode (not shown) in the circuit so that the polarity of the output voltage is either positive (plus) or negative (minus) with respect to the ground potential. can do.

The output voltage Vdc of the voltage doubler rectifier circuit 22b is supplied to the pin electrode 2e provided in the vicinity of the nozzle 2f of the spray gun 2 via the output resistor 22c.
In the DC high voltage generator 22, the output voltage Vdc changes according to the magnitude of the input AC voltage Vac. In this case, when the AC voltage Vac is the first AC voltage Vac1, the output voltage Vdc is the first DC voltage Vdc1 (−60 kV), and when the AC voltage Vac is the second AC voltage Vac2, the second DC voltage Vdc2 ( -30 kV), and the output voltage Vdc is 0 kV when the AC voltage Vac is 0 kV.

  The LED drive circuit 23 controls the lighting of the LED 24, and generates a voltage corresponding to the AC voltage Vac given to the primary side of the step-up transformer 22a to light the LED 24. That is, when the AC voltage Vac is the first AC voltage Vac1 for the first DC voltage Vdc1 (−60 kV), the illuminance of the LED 24 becomes high, and the voltage for the second DC voltage Vdc2 (−30 kV) is increased. In the case of the second AC voltage Vac2, the illuminance of the LED 24 is low. In this way, it is displayed that the output voltage Vdc of the direct-current high voltage generator 22 is the first direct-current voltage Vdc1 and the second direct-current voltage Vdc2 when the illuminance of the LED 24 is “high” and “low”. Further, the LED 24 is turned off to indicate that the output voltage Vdc of the DC high voltage generator 22 is 0 V (output stop).

  The paint valve 25 and the air valve 26 are opened when the trigger 2d is pulled. The paint valve 25 is connected to the paint tank 28 via the paint supply pipe 8 and the paint pump 27. When the paint valve 25 is opened, the paint travels from the paint discharge port near the nozzle 2f to the surface of the pin electrode 2e. Discharged.

  The air valve 26 is connected to the compressor 29 via the air supply pipe 6 and the air flow switch 21. As described above, the air flow switch 21 operates when air flows through the air piping path, and supplies an air flow detection signal, that is, a trigger operation detection signal to the control unit 16.

  The compressed air supplied from the compressor 29 is discharged from an atomizing air hole and a pattern forming air hole provided in the vicinity of the nozzle 2f, thereby atomizing the discharged paint and atomizing the paint. The particles are formed into a shape suitable for painting (paint pattern) and sprayed. The paint particles are charged by the pin electrode 2e almost simultaneously with atomization. The charged paint particles adhere to the grounded object by electrical adsorption, whereby the object to be coated is applied.

Now, the control contents of the control unit 16 will be described with reference to FIG. When the operation member 12 is set to the non-responsive position in FIG. 3 and the compressor 29 is turned on, when the operator pulls the trigger 2d, the air flow switch 21 is turned on.
When determining that the air flow switch 21 is turned on in step P1, the control unit 16 outputs a first output voltage command to the oscillation circuit 17a in step P2. As a result, the power supply unit 17 outputs the first AC voltage Vac1, and the DC high voltage generator 22 outputs the first DC voltage Vdc1 (the first DC voltage Vdc1 is output as the initial voltage. The previous voltage. Can also be stored as the initial voltage.) At the same time, the LED 24 has high illuminance for displaying the first DC voltage Vdc1 as described above.

  In the next step P3, it is determined whether or not the operating member 12 has been operated so as to reach the response position in FIG. 2, that is, whether or not there is an input on-edge of the closing determination signal S20. If it is determined that there is an input on-edge of the closing determination signal S20, a second output voltage command is output to the oscillation circuit 17a instead of the first output voltage command in step P4. As a result, the power supply unit 17 outputs the second AC voltage Vac2, and the DC high voltage generation unit 22 outputs the second DC voltage Vdc2. At the same time, the LED 24 has low illuminance for displaying the second DC voltage Vdc2 as described above.

  Next, in step P5, it is determined whether or not the operating member 12 is once moved to the non-responsive position of FIG. 3 and then moved again to the non-responsive position of FIG. 2, that is, whether there is an input on-edge of the closing determination signal S20. To do. If it is determined that there is an input on-edge of the close determination signal S20, an output stop command is output to the oscillation circuit 17a instead of the second output voltage command in step P6. As a result, the power supply unit 17 stops the output of the DC voltage from the DC high voltage generator 22 by stopping the output of the AC voltage Vac. At the same time, the LED 24 is turned off as described above.

  In step P7, the operating member 12 is once again operated to the non-responsive position of FIG. 3 and then operated to reach the reactive position of FIG. 2, that is, there is again an input on-edge of the closing determination signal S20. It is determined whether or not. If it is determined that the closing determination signal S20 has an input on-edge, the process returns to step P2 described above, and in step P2, the first output voltage command is output to the oscillation circuit 17a.

When the pulling operation of the trigger 2d is released, the air valve 26 is closed and the air flow switch 21 is turned off, so that the control unit 16 stops the above-described control operation and enters the air flow switch 21 on standby state.
As described above, when the trigger 2d is pulled, the control unit 16 controls the direct-current high voltage generation unit 22 to be the first direct-current voltage Vdc1, and the operation member 12 reaches the responsive position. Each time the operation is performed (every time an input operation is performed), the switching control is performed as follows: second DC voltage Vdc2 → output stop → first DC voltage Vdc1 → second DC voltage Vdc2 →... (See FIG. 10).

  In the first embodiment described above, the input operating device 10 for adjusting the output voltage Vdc of the DC high voltage generator 22 as a predetermined control target is magnetically actuated to generate an electrical signal (switch opening / closing signal). The reed switch 11 serving as a magnetically responsive part that generates a magnetic field and an operation member 12 having a magnet 15 are provided. The reed switch 11 is provided in the vicinity of the spray gun 2 in the cable 4, and the operation member 12 is sprayed. The gun 2 is provided so as to be displaceable between a responsive position where the magnet 15 magnetically reacts the reed switch 11 and a non-responsive position where the magnet 15 does not magnetically react the reed switch 11. And the control part 16 adjusts and controls the said control object according to the switch opening / closing signal which is an electrical signal which the reed switch 11 generate | occur | produces.

  According to the above configuration, the electrical signal generation state of the reed switch 11 differs when the operator switches the operation member 12 provided on the spray gun 2 between the responsive position and the non-responsive position. Since the control unit 16 adjusts and controls the output voltage Vdc of the DC high voltage generation unit 22 according to the electrical signal generated by the reed switch 11, the output voltage Vdc of the DC high voltage generation unit 22 is adjusted to the spray gun 2 Can be adjusted on the side. In addition, since the input operation device 10 includes the reed switch 11 and the operation member 12 having the magnet 15, the configuration of the input operation device 10 can be simplified.

  Further, in the present embodiment, paying attention to the fact that the spray gun 2 is provided with a detachable cable mounting member 5 for mounting the cable 4 at the bottom of the grip portion 2c, the operation member 12 is connected to the cable mounting member 5 It is attached to. According to this, the operation member 12 can be attached to the spray gun 2 using the cable attachment member 5 originally provided in the spray gun 2. In addition, since the cable attachment member 5 can be attached to and detached from the grip portion 2c, the operation member 12 can be easily attached to the spray gun 2. Further, since the reed switch 11 of the input operation device 10 is provided on the cable 4 and the operation member 12 of the input operation device 10 is attached to the cable attachment member 5, the input operation device is connected to one unit of the cable 4 and the cable attachment member 5. Thus, the positioning and assembly of the reed switch 11 and the operation member 12 are simplified.

  Further, in the present embodiment, as shown in FIG. 5, the operation member 12 is provided so as to be displaceable between the responsive position and the non-responsive position in the lower region E of the grip portion 2c. According to this, it is possible to prevent the operator from inadvertently operating the operation member 12 during the painting operation. That is, since the cable 4 and the air supply pipe 6 are originally present in the lower region E of the grip portion 2c, the operator is always careful not to contact the cable 4 and the air supply pipe 6. Therefore, the operation member 12 existing in the lower region E is not contacted, and the operator does not carelessly operate the operation member 12. However, when the operator intends to perform the operation, the operation member 12 exists in the lower region E of the grip portion 2c, so that even if the operator is right-handed (the hand holding the spray gun 2 is the right hand). Even if it is left-handed, the other hand can easily reach the operation member 12, the operation member 12 can be easily operated, and it is easy to use.

  In the present embodiment, the control target is the output voltage Vdc of the DC high voltage generator 22. According to this, the output voltage Vdc of the DC high voltage generator 22 can be increased, decreased, or stopped (change-controlled) by the operation on the spray gun 2 side. This can be simplified when the output voltage Vdc is changed according to the type of the object.

In the present embodiment, the magnetically responsive portion is constituted by the reed switch 11. According to this, since the reed switch 11 itself has a simple configuration and a small size, it can be easily provided inside the cable 4.
Note that the position of the operation member 12 is not limited to the lower region E of the grip portion 2c described above. The magnetically responsive part may be a Hall IC. Furthermore, air pressure or the like may be used as a control target. Further, the output voltage Vdc of the DC high voltage generator 22 may be switched other than −60 kV, −30 kV, and 0 kV.

  11 and 12 show a second embodiment. In this embodiment, when the operating member 12 is operated so as to reach the responsive position, and conversely, when the operating member 12 is operated so as to reach the responsive position from the non-responsive position, the direct-current high voltage generator 22 is respectively provided. The output voltage Vdc is alternately switched between the second DC voltage Vdc2 and the first DC voltage Vdc1. That is, in FIG. 11, when the control unit 16 determines that the airflow switch 21 is turned on (“YES” in step T1), the control unit 16 outputs a first output voltage command in step T2 (DC high voltage generation unit 22). Output voltage Vdc of the first DC voltage Vdc1).

  Next, when there is an input of the closing determination signal S20 (determined in step T3), a second output voltage command is output in step T4 (the output voltage Vdc of the DC high voltage generator 22 is set to the second DC voltage Vdc2). ). Next, when the input of the closing determination signal S20 is lost (determined in step T5), the process returns to step T2, and the first output voltage command is output in step T2 (the output voltage Vdc of the DC high voltage generator 22 is the first). DC voltage Vdc1).

As described above, in the second embodiment, first, the output voltage Vdc of the DC high voltage generator 22 is set to the first DC voltage Vdc1, and then the operation of the operating member 12 from the non-responsive position to the responsive position, and Based on the reverse operation, the output voltage Vdc of the DC high voltage generator 22 is controlled to be switched to the second DC voltage Vdc2, the first DC voltage Vdc1, the second DC voltage Vdc2,.
According to the second embodiment, the output voltage Vdc of the DC high voltage generator 22 is changed to the second DC voltage Vdc2 based on the operation of the operating member 12 from the non-responsive position to the responsive position and vice versa. And the first DC voltage Vdc1 can be switched (adjusted).

  13 and 14 show a third embodiment. In FIG. 13, an interlocking switch 30 that closes in conjunction with the pulling operation of the trigger 2d is provided inside the spray gun 2, and the interlocking switch 30 and the reed switch 11 are connected in series. The operation determination circuit 20 outputs a high-level close determination signal S20 only when both the interlock switch 30 and the reed switch 11 are closed (on) (see FIG. 14). The controller 16 sets the output voltage Vdc of the DC high voltage generator 22 to the first DC voltage Vdc1 when the closing determination signal S20 is input from the operation determination circuit 20. According to this embodiment, by operating the operation member 12 in a state where the trigger 2d is pulled (a state where paint is sprayed), the output voltage Vdc of the DC high voltage generator 22 is set to the first DC voltage Vdc1 and 0 kV. And can be switched. Further, according to this embodiment, the air flow switch 21 shown in FIG. 8 can be omitted.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and equivalents thereof.

  In the drawings, 1 is an electrostatic coating device, 2 is a spray gun, 2c is a grip part, 2d is a trigger, 3 is an electrostatic controller, 4 is a cable, 5 is a cable mounting member, and 10 is an input operation device (input operation means). , 11 is a reed switch (magnetic response part), 12 is an operation member, 15 is a magnet, 16 is a control part, 17 is a power supply part, and 22 is a direct current high voltage generation part.

Claims (5)

A spray gun for electrostatic coating that has a trigger and a direct-current high-voltage generator and sprays the paint charged in accordance with the operation of the trigger to apply to the object to be coated;
An electrostatic controller including a control unit that performs overall control of the coating and various settings, and a power supply unit that supplies power to the DC high voltage generation unit;
A cable for electrically connecting the electrostatic controller and the spray gun;
An input operation means for performing an input operation for setting or adjusting a predetermined control target,
The input operation means;
A magnetically responsive part that is provided in the vicinity of the spray gun in the cable and generates an electrical signal by magnetically responsively;
An operation which is configured to have a magnet and is provided on the spray gun so as to be displaceable between a responsive position where the magnet magnetically reacts the magnetically responsive portion and a non-responsive position where the magnet does not magnetically react the magnetically responsive portion. Composed of members,
The said control part is an electrostatic coating apparatus which controls the said control object according to the electrical signal which the said magnetic response part generate | occur | produces. The spray gun has a grip part and a detachable cable attachment member for attaching the cable to the bottom of the grip part.
The electrostatic coating apparatus according to claim 1, wherein the operation member is attached to the cable attachment member.   The electrostatic coating apparatus according to claim 2, wherein the operation member is provided so as to be displaceable between the responsive position and the non-responsive position in a lower region of the grip.   The electrostatic coating apparatus according to any one of claims 1 to 3, wherein the control target is an output voltage of a DC high voltage generator.   The electrostatic coating apparatus according to claim 1, wherein the magnetically responsive portion is constituted by a reed switch.

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