JPH091458A - Controller for chip dresser - Google Patents

Abstract

PURPOSE: To reduce a load in dressing work by arranging a means which receives a remote control signal instructing a start of dressing from a dresser main body so as to control pressurization and pressing force for the dresser main body by an electrode chip. CONSTITUTION: In a timing generating circuit 41, a timing signal complying with the predetermined pressurization pattern is generated on the basis of a starting signal S4 from a starting input receiving circuit 31 so as to be outputted to a chip dressing pressure setting circuit 43 via an interface circuit 42. In the chip dressing pressure setting circuit 43, a pressing force level setting signal S2 serving as a voltage signal for setting pressing force for a dresser main body by an electrode chip is outputted to an electropneumatic proportional valve according to a timing signal from a timing generating circuit 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip dresser controller, and more particularly to a chip dresser having a portable dresser body for dressing (polishing) electrode chips of a welding machine such as a stationary spot welding machine and a multi-spot welding machine. Portable dresser) controller.

[0002]

2. Description of the Related Art In spot welding machines such as stationary spot welding machines and welding machines such as multi-spot welding machines, when the shape of the electrode tips is deformed due to abrasion of the electrode tip due to repeated pressurization and energization, the welding quality is improved. Since it cannot be secured, a tip dresser for polishing the electrode tip is used.

As a conventional chip dresser, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-181985,
A moving body is supported to be lifted up and down on a frame fixed on a base, the dresser body is fixed to this moving body, and a cutter blade that is driven to rotate by an air motor is attached to this dresser body. A stationary tip dresser in which a cutter blade is rotated by an air motor while the electrode tip is pressed to polish the electrode tip is known.

[0004]

However, in the above-described conventional tip dresser, since one stationary type dresser must be installed corresponding to one welding machine, the welding equipment becomes large. However, there is a problem that the cost is rising.

Therefore, the dresser main body is made portable so that an operator can carry it to the place where the welding machine is installed and polish the electrode tip appropriately, and a driving source for driving the cutting tool to reduce the burden of dressing work. A portable chip dresser (portable dresser) provided in the dresser body can be considered.

The present invention has been made in view of the above points, and an object thereof is to provide a controller suitable for a portable chip dresser.

[0007]

In order to solve the above problems, a controller of a tip dresser according to claim 1 uses a portable dresser body having a drive source for driving a cutting tool for polishing an electrode tip of a welding machine. , A controller of a tip dresser that polishes the electrode tip by driving the cutting tool while pressing the cutting tool of the dresser body with the electrode tip, and a remote control signal for instructing dress activation from the dressing body. Means for receiving and controlling the pressure and pressure of the dresser body by the electrode tip are provided.

According to a second aspect of the present invention, in a controller of a tip dresser, a portable dresser body having a driving source for driving a blade tool for polishing an electrode tip of a welding machine is used, and the blade tip of the dresser body is pressed by the electrode tip. A controller of a tip dresser that polishes the electrode tip by driving the cutting tool in a state, a start input receiving means that receives a remote control signal instructing a dress start from the dresser body and outputs a start signal, Timing generating means for generating and outputting a timing signal according to a predetermined pressurization pattern based on the activation signal from the activation input receiving means, and for the dresser body by the electrode tip according to the timing signal from the timing generation means. Dressing pressure setting means for setting the pressing force and the starting input receiving means A switching means for switching between pressurizing and non-pressurizing the dresser body by the electrode tip in response to a motion signal; a driving preparation switch means for instructing a driving preparation; and a driving preparation instruction signal from the driving preparation switch means. The operation input preparation means for enabling the operation signal output by the operation input reception means to be ready for operation, the interlock means for interlocking with another controller, and the operation start signal received from the operation input reception means. An operation preparation reset means for releasing the operation preparation state by the operation preparation means when the output is stopped is provided.

The controller of the chip dresser according to claim 3 is the controller of the chip dresser according to claim 2, wherein the interlock means outputs a start prohibition signal to another controller when the operation preparation means is in the operation preparation state. However, it is configured to include means for prohibiting the operation preparation means from entering the operation preparation state when a start prohibition signal is input from another controller.

A chip dresser controller according to a fourth aspect is the chip dresser controller according to the third aspect, wherein the interlock means operates by the operation preparation switch means when a start prohibition signal is input from another controller. It is configured to have means for invalidating the operation preparation instruction.

A tip dresser controller according to a fifth aspect of the present invention is the tip dresser controller according to any one of the second to fourth aspects, in which the dressing pressure setting means supplies an air pressure to an actuator that drives an electrode tip of the welding machine. Is controlled, and the switching means controls the pressurizing solenoid valve that opens and closes the air pressure supply path to the actuator.

A tip dresser controller according to a sixth aspect of the present invention is the tip dresser controller according to the fifth aspect, wherein the welding pressure is controlled by controlling the electropneumatic proportional valve when a start signal from the start input receiving means is not input. A welding pressure setting means for setting is set.

[0013]

The controller of the chip dresser according to claim 1 is
By receiving a remote control signal from the dresser body that instructs the dresser to start, the pressurization and pressure of the dresser body by the electrode tip of the welding machine are controlled, so the portability of the dresser body is improved and the workability of dressing work is improved. A portable chip dresser controller is obtained.

According to another aspect of the present invention, in the controller of the chip dresser, when the activation input receiving means receives the remote control signal for instructing the dress activation from the dresser main body, the activation signal is output and the timing generating means forms a predetermined pressure pattern. A corresponding timing signal is generated and output, the pressing force (dressing pressure) of the dresser body by the electrode tip is set according to this timing signal, and the pressurization of the dresser body is controlled by the switching means according to the start signal.
By instructing dress start by remote control from the dresser body, the electrode tip of the welding machine can pressurize the dresser body and polish the electrode tip, and by the operation preparation switch means, the operation preparation means and the interlock means, Since the start signal is enabled only when the other controller is not in the operation ready state, the same controller is installed in the other welding machines and the dresser main body is shared.
One dresser main body can start multiple controllers individually, and the operation preparation resetting means cancels the operation preparation state after the dressing is completed. Thus, it is possible to obtain a controller of a portable chip dresser that has good operability, does not malfunction, and can perform highly accurate control.

According to a third aspect of the controller of the chip dresser of the second aspect, in the controller of the second aspect of the chip dresser, the interlock means outputs a start prohibition signal to another controller when the operation preparation means is in the operation preparation state. Since the operation preparation means is prohibited from entering the operation preparation state when the activation prohibition signal is input from another controller, interlocking between the controllers can be ensured.

According to a fourth aspect of the chip dresser controller of the third aspect, in the tip dresser controller of the third aspect, the operation preparation switch means prepares the operation when the interlock means receives an activation prohibition signal from another controller. Since the instruction is invalidated, the operation preparation instruction itself is prohibited, and the interlock between the controllers can be more surely taken.

The tip dresser controller according to a fifth aspect is the tip dresser controller according to any one of the second to fourth aspects, in which air is supplied to an actuator for driving an electrode tip of the welding machine by an output signal of the dressing pressure setting means. The electro-pneumatic proportional valve that sets the pressure is controlled, and the pressurizing solenoid valve that switches the supply / cutoff of the air pressure to the actuator is controlled by the output signal of the switching means. The electropneumatic proportional valve and the pressurizing solenoid valve for driving the motor can be shared with the tip dresser as they are, and the configuration of the tip dresser is simplified.

A tip dresser controller according to a sixth aspect of the present invention is the tip dresser controller according to the fifth aspect, further comprising welding pressure setting means for controlling the electropneumatic proportional valve when a start signal from the start input receiving means is not input. Since it is provided, the welding pressure of the welding machine can be variably set by using this controller.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an overall system configuration diagram showing an embodiment of the present invention, FIG. 2 is an external perspective view of a dresser main body, FIG. 3 is a block diagram of a controller, FIG. 4 is a start input acceptance circuit of FIG.
FIG. 5 is a circuit diagram showing the details of the interlock relationship with the pressurizing valve switching circuit and the welding timer 8, FIG. 5 is a circuit diagram showing the details of the chattering prevention circuit, the operation preparation circuit, and the malfunction prevention circuit of FIG. 3, and FIG. 3 is a circuit diagram showing the details of the interlock circuit of FIG. 3, FIG. 7 is a circuit diagram showing the details of the timing generation circuit of FIG. 3, and FIG. 8 is a detailed view of the tip dress pressure setting circuit, the welding pressure setting circuit of FIG. A circuit diagram shown in FIG. 9, FIG. 9 is an external view of the controller, and FIG. 10 is an explanatory diagram illustrating a connection relationship between the controllers.

This tip dresser system includes electrode tips 1a and 1b of the upper gun 1A and the lower gun 1B of the welding machine.
A portable dresser main body 2 having a drive source for rotationally driving a cutting tool for polishing, and a controller according to the present invention for controlling the dressing of the electrode tips 1a, 1b using the dresser main body 2 3 and a pressurizing drive system 4 controlled by the controller 3 to pressurize the dresser body 2 by the electrode chips 1a and 1b during dressing.
And a light projector 5 and a light receiver 6 for giving a dress activation instruction from the dresser main body 2 to the controller 3 by remote control.

As shown in FIG. 2, the dresser main body 2 rotatably holds a polishing tip (blade) 12 for polishing the electrode tips 1a and 1b at the tip of the cutter holder portion 11, and at the base of the cutter holder portion 11. The polishing tip 12 is rotationally driven by a motor 13 as a drive source attached through a drive force transmission mechanism provided in the holder portion 11. Then, the grip portion 14 is attached to the base portion of the cutter holder portion 11, the battery 15 serving as the power source of the motor 13 is detachably attached to the rear end portion of the grip portion 14, and the holder portion 1
An auxiliary grip portion 16 is attached to the side portion of 1.

Further, the remote control projector 5 is provided inside the case at the base of the cutter holder 11 on the side of the motor 13, and the start switch 18 is provided on the lower surface of the grip 14. This start switch 18 is
A two-stage switch is used to instruct rotation driving of the motor 13 in the first stage, and in addition to that, instruct dress activation in the second stage so that the projector 5 emits a dress pressurizing signal which is a predetermined optical signal.

The pressurizing drive system 4 is also used as the pressurizing drive system of the welding machine itself, and supplies the air from the air source to the electropneumatic proportional valve 24 via the filter 21, the regulator 22 and the lubricator 23. The electropneumatic proportional valve 24 controls the supplied air to an air pressure according to a control voltage and sends it out. Then, the air from the electropneumatic proportional valve 24 is supplied to the cylinder 26 that drives (lowers) the upper gun 1A (electrode tip 1a) via the pressurizing solenoid valve 25. The pressurizing solenoid valve 25 opens and closes the air supply path according to the control signal. Therefore, the controller 3 outputs the pressing force level setting signal S2 to the electropneumatic proportional valve 24 to control the pressing force level (dressing pressure), and outputs the pressurizing signal S3 to the pressurizing solenoid valve 24 to pressurize / non-pressurize. The pressurization is switched and controlled.

Further, the controller 3 and the welding timer 8 of the welding machine to which a welding start instruction is given from the welding start switch 7 are connected to establish a current interlock, and a welding pressure signal from the welding timer 8 is sent. Controller 3
Is being entered.

As shown in FIG. 3, the controller 3 includes a start input receiving circuit 31 which is a start input receiving means including the light receiver 6, a drive preparation switch 32 which is a drive preparation switch means, a chattering prevention circuit 33, and a gate. The circuits 34 and 35, the operation preparation circuit 36 and the gate circuit 37 which are the operation preparation means, the malfunction prevention circuit 38, the interlock circuit 39 which is the interlock means, the reset signal generation circuit 40 which is the operation preparation reset means, and the timing generation means. Certain timing generation circuit 41, interface circuit 42 and chip dress pressure setting circuit 43 which are dressing pressure setting means, pressurizing valve switching circuit 44 which is switching means, interface circuit 45 which is welding pressure setting means and welding pressure setting circuit It is equipped with 46 etc.

The activation input acceptance circuit 31 is used for the dresser main body 2
A light receiving pressure signal which is a remote control signal emitted from the light projecting device 5 is received by the light receiving device 6, and the dresser body 2 is pressed by the electrode chips 1a and 1b from the light receiving pressure signal S1 from the light receiving device 6 The signal S4 is generated and output.

The operation preparation switch 32 is an illuminated push button type switch and outputs an operation preparation instruction signal S5. The chattering prevention circuit 33 shapes the output signal (driving preparation instruction signal S5) of the driving preparation switch 32 to generate and output the driving preparation instruction signal S6. The gate circuit 34 inputs the operation preparation instruction signal S6 from the chattering prevention circuit 33 and the activation signal S4 from the activation input acceptance circuit 31, and outputs a signal S7 corresponding to these input signals. The gate circuit 35 outputs the output signal S of the gate circuit 34.
7 and the output signal S8 from the reset signal generation circuit 40 are input, and a signal S9 corresponding to these input signals is output.

The operation preparation circuit 36 sends the operation preparation signal S1 to the gate circuit 37 in response to the output signal S9 from the gate circuit 35.
In addition to outputting 0, the operation preparation signal S10 is also output to the interlock circuit 39. The gate circuit 27 is in an open state in which the start input acceptance circuit 31 permits the input of the start signal S4 to the timing generation circuit 41 when the drive preparation signal S10 from the operation preparation circuit 36 is input (this state is It becomes "operation preparation state"). This gate circuit 3
In addition to the timing generation circuit 41, the activation signal S4 from 7
It is also input to the welding pressure setting circuit 46 via the pressure valve switching circuit 44 and the interface circuit 45.

The malfunction prevention circuit 38 is provided with an operation preparation instruction signal S from the chattering prevention circuit 33 when the dress power is turned on.
6 and the stop signals S11 and S12 that prevent the operation preparation signal S10 from being output from the operation preparation circuit 36.

The interlock circuit 39 is a circuit and an input / output system for interlocking with the controller 3 installed in another machine A and / or another machine B which are adjacent welding machines. The reset signal generation circuit 40 outputs the signal S1 output from the timing generation circuit 41 at the end of dressing.
3 is input to generate the reset signal S8, and the gate circuit 3
5 to the operation preparation circuit 36.

The timing generation circuit 41 generates a timing signal according to a predetermined pressurization pattern based on the activation signal S4 from the activation input reception circuit 31 and sends it to the chip dress pressure setting circuit 43 via the interface circuit 42. Output. Here, the "predetermined pressurization pattern" indicates the relationship between the dressing pressure and the time for applying the dressing pressure, and in the present embodiment, the pressurizing force is divided into prepressurization, main pressurization, and finishing pressure. It is set in three stages (see FIG. 15), the time for applying the pre-pressurizing force is the pre-pressurizing time, and the time for applying the main pressurizing force is the main pressurizing time. A timing signal for the pressurizing time and the timing signal for the main pressurizing time are generated.

The tip dressing pressure setting circuit 43 outputs a pressure force level setting signal S2 which is a voltage signal for setting the pressure force of the dresser body 2 by the electrode chips 1a and 1b according to the timing signal from the timing generation circuit 41. Output to the electro-pneumatic proportional valve 24. The pressurizing valve switching circuit 44 outputs a pressurizing signal S3 to the pressurizing solenoid valve 25 in response to the start signal S4 from the start input receiving circuit 31, and pressurizes / non-pressurizes the dresser body 2 by the electrode chips 1a and 1b. Switch the pressure.

The welding pressure setting circuit 46 is a voltage signal level for setting the welding pressure at the time of welding in response to the activation signal S4 from the activation input acceptance circuit 31 input through the interface circuit 45. The setting signal S2 'is output to the electropneumatic proportional valve 25.

Next, the details of each part will be described with reference to FIG. 4 and subsequent figures. Referring to FIG. 4, activation input acceptance circuit 3
When the starter switch 18 is operated and the dressing pressurization signal is emitted from the projector 5 in the state where the dresser main body 2 is set between the electrode tips 1a and 1b in a desired posture on the welder side, In addition, it is installed at a position to receive this dress pressure signal.

As shown in FIG. 4, the activation input acceptance circuit 31 has the output stage transistor TR1 of the photodetector 6.
PD1 which is on / off controlled by a dressing pressure signal S1 from
The photocoupler 51 including the phototransistor PTR1 for receiving the emitted light of the light, the Schmitt trigger inverter 52, the input side resistor R1 and the capacitor C1, the output side resistor R2 and the capacitor C2, and The activation signal S4 is output from the Schmitt trigger inverter 52 in response to the dress pressurizing signal S1.

Referring to FIG. 5, the operation preparation switch 32
Is a push button (PB) type switch having a normally open contact a and a normally closed contact b as shown in FIG. The chattering prevention circuit 33 connects the normally open contact a and the normally closed contact b of the operation preparation switch 32 to the resistor R3 and the interlock circuit 3.
Pull-up resistors R4 and R5 that pull up to the power supply Vcc via 9 and positive edge going type J
A -K type flip-flop (hereinafter referred to as "FF") circuit 53 and capacitors C3 and C4.

The FF circuit 53 has a J terminal, a K terminal, and a CK.
The (clock) terminal is grounded, the output signal S5a of the normally open contact a of the operation preparation switch 32 is input to the preset (PR) terminal, and the operation preparation switch 32 is input to the clear (CLR) terminal.
The output signal S5b of the normally closed contact b of is input. Then, the inverted Q output of the FF circuit 53 is output to the gate circuit 34 as the operation preparation instruction signal S6.

The gate circuit 34 is the activation input acceptance circuit 31.
Chattering prevention circuit 3 when the start signal S4 from is "L"
When the driving preparation instruction signal S6 from 3 becomes "L", the signal S7 which becomes "H" is output. The gate circuit 35 is
When the signal S7 from the gate circuit 34 is "L" and the reset signal S8 from the reset signal generation circuit 40 is "L", the signal S9 which becomes "H" is output.

The operation preparation circuit 36 is composed of a positive edge going type JK FF circuit 54 and a Schmitt trigger inverter 55. The FF circuit 54 is J
The terminal, the K terminal and the PR terminal are connected to the power supply VDD, the output signal S9 of the gate circuit 35 is input to the CK terminal via the Schmitt trigger inverter 55, and the blocking signal S11 from the malfunction prevention circuit 38 is input to the CLR terminal. To do. Then, the Q output of the FF circuit 54 is output to the gate circuit 37 and the interlock circuit 39 as the operation preparation signal S10. The gate circuit 37 is in the open state while the operation preparation signal S10 from the operation preparation circuit 36 is “H”, and allows the activation signal S4 from the activation input reception circuit 31 to pass.

The malfunction prevention circuit 38 includes a delay circuit 55 including a resistor R6, a capacitor C5 and a diode D1.
The Schmitt trigger inverters 56 and 57 are provided, and the delay circuit 55 delays the rise of the voltage level at the point P1 and the blocking signal S11 obtained via the Schmitt trigger inverters 56 and 57 is sent to the FF circuit 54 of the operation preparation circuit 36. Output.

A parallel circuit of a Zener diode ZD1 and a capacitor C6 is connected between the feed line (point P1) from the interlock circuit 39 to the chattering prevention circuit 33 and the ground to prevent voltage fluctuation, and also the interlock circuit. Between the connection point between the resistor 39 and the resistor R3 and the ground, a leveling permission display lamp 58 for indicating permission for driving preparation is connected via a resistor R7.

The interlock circuit 39 is, as shown in FIG. 6, a switching circuit 60 which is on / off controlled by an operation preparation signal S10 from an operation preparation circuit 36, and the controller 3 of the other machines A and B by this switching circuit 60. The start prohibition input / output system 61 outputs the start prohibition to the controller 3 and inputs the start prohibition from the controllers 3 of the other machines A and B.

The switching circuit 60 is the operation preparation circuit 3
A switching transistor TR2 for turning on / on by inputting an operation preparation signal S10 from 6 through a resistor R8.
The relays 62 and 63 to which power is supplied when the switching transistor TR2 is turned on, the backflow prevention diode D2 connected in parallel with the relays 62 and 63, and the controller 3 are in the operation ready state. Level indicator lamp 64 and resistance R9 indicating that
Consists of

Further, the start-prohibited input / output system 61 is connected to the other device A,
When connected to the start-prohibited input / output system of the controller 3 of B, the normally-closed contact CR11 of the relay 62 of the switching circuit 60 is also in the power supply path from the power supply Vcc of the controller 3 of the other machine A to the operation preparation switch 32. In addition, the normally closed contact CR11 of the relay 62 is provided in the power supply path from the power supply Vcc of the controller 3 of the other machine B to the operation preparation switch 32, and the controller of the other machine A and / or B is connected from the power supply Vcc. Power is supplied to the operation preparation switch 32 via the normally closed contact CR12 of the relay 62 of No. 3.

Next, with reference to FIG. 7, the timing generation circuit 41 includes a pre-pressurizing monomulti 65 including a dual retriggerable monostable multivibrator.
A variable resistor VR1, a resistor R10, a capacitor C7 for setting the pulse width (pre-pressurization time) of the monomulti 65, and a dual retriggerable monostable capacitor.
Mono-multi 66 for main pressurization consisting of multi-vibrator
And a variable resistor VR2, a resistor R11, a capacitor C8 for setting the pulse width (main pressurization time) of the monomulti 66, AND circuits 67 and 68, and a NOR circuit 69.

The starting signal S4 from the starting input receiving circuit 31 is input to the pre-pressurizing mono-multi 65 through the gate circuit 37, and the signal S15 which is the inverted Q output of the pre-pressing mono-multi 65 and the starting signal S4. Is input to the AND circuit 67, and the output of the AND circuit 67 is applied to the main pressurization monomulti 6
6, and the inverted Q output (signal) S15 of the pre-pressurizing monomulti 65, the inverted Q output (signal) S16 of the main pressurizing monomulti 66, and the activation signal S4 are input to the AND circuit 68.

Then, the reversal Q of the mono-multi 65 for pre-pressurization
Output S15, inverted Q output S1 of mono-multi 66 for main pressurization
6 and the output S18 obtained by inverting the output S17 of the AND circuit 68 by the NOR circuit 69, respectively.
The output S17 of the AND circuit 68 is output to the reset signal generation circuit 40 while being output to the chip dressing pressure setting circuit 43 via 2.

The reset signal generating circuit 40 includes a resistor R
12 and a capacitor C10, and an output S17 of the AND circuit 68 as it is as one input, and an integration output S8a from the integration circuit 71 is inverted by a Schmitt trigger inverter 72 as a signal S8b as a gate circuit. When the output S17 of the AND circuit 68 becomes "L", the reset signal S8 is output to the operation preparation circuit 36 via the gate circuit 35.

Next, referring to FIG. 8, the dress-type interface circuit 42 has an inverted Q output S15 of the pre-pressurizing monomulti 65 of the timing generation circuit 41, an inverted Q output S16 of the main pressurizing monomulti 66, Output S of NOR circuit 69
Three photocouplers 75 to 77 for inputting 18 respectively
Consists of The chip dress pressure setting circuit 43 includes resistors R13 to R15 and variable resistors VR3 to VR5 connected to the output sides of the photocouplers 75 to 77 of the interface circuit 42.
And a resistor R16 and diodes D3 to D5,
A voltage signal corresponding to the resistance values of the variable resistors VR3 to VR5 is output to the electropneumatic proportional valve 24 as a pressing force level setting signal S2.

Further, a welding system interface circuit 45
Is composed of a photocoupler 78 which inputs the activation signal S4 from the activation input reception circuit 31 via the gate circuit 37.
The welding pressure setting circuit 46 includes a rotary switch 79 connected to the output side of the photocoupler 78 and variable resistors VR6 to VR.
It is composed of R8, a resistor R17 and diodes D6 to D8, and outputs a voltage signal corresponding to the resistance value of the variable resistors VR6 to VR8 to the electropneumatic proportional valve 24 as a pressing force level setting signal S2 '.

Next, returning to FIG. 4, the pressurizing valve switching circuit 44 includes a switching transistor TR3,
Phototriac 81, surge absorber 82, resistance R
19 and R20, the activation signal S4 from the activation input acceptance circuit 31 is input via the gate circuit 37, this activation signal S4 is input to the transistor TR3 via the resistor R19, and the output end of the phototriac 81 is connected. The pressurizing solenoid valve 25 is provided in a power supply path to switch the light emitting element side. Further, the power supply path to the pressurizing solenoid valve 25 is provided with the normally open contacts CR21 and CR22 of the relay 63 of the interlock circuit 39 described above.

Further, the relay 6 of the interlock circuit 39
2 normally closed contacts CR13 for welding timer 8 when dressing
To the normally closed contact CR23 of the relay 63,
The solenoid valve terminal of the welding timer 8 is cut off by the CR 24 during dressing. In addition, a power supply circuit 83, a power-on display lamp 84, etc. are provided.

As shown in FIG. 9, the controller 3 described above includes the operation preparation switch 32, the welding pressurizing force selection rotary switch 79, and the dressing time setting variable resistors VR1 and V1.
R2 and dress pressure setting variable resistors VR3 to VR5 are arranged so that they can be operated externally, and a leveling permission display lamp 58, a leveling display lamp 64, and a power-on display lamp 84 are also arranged. Here, the variable resistors VR1 to VR5 are provided so that they can be externally operated while being installed on the internal PCB substrate.

As shown in FIG. 10, controllers 3, 3, 3 ... Are installed in a plurality of welding machines WA, WB, WC ... The start prohibition input / output terminals of the interlock circuit 39 of No. 3 are connected to each other. For example, welding machine WA
The start prohibition output terminal of the controller 3 of the welding machine WB, W
The start prohibition input terminal of the controller 3 of the welding machine WA is connected to the start prohibition input terminal of the controller 3 of C (corresponding to the other machines A and B in the above description) and the start prohibition output of the controller 3 of the welders WB and WC. Connect to each terminal.

Next, the operation of the chip dresser system configured as described above will be described with reference to FIG. 10 and subsequent figures. First, the startup input acceptance circuit 31 is the dresser main body 2
When the start switch 18 is set to the second stage and the dressing pressurization signal is emitted from the light projector 5, the dressing pressurization signal is received by the photodetector 6, and the transistor TR1 of the photodetector 6 is turned on. When the pressure signal S1 becomes “L”, the photodiode PD1 of the photocoupler 51 is turned on, the phototransistor PT1 is turned on, and the Schmitt trigger inverter 52 outputs the start signal S4 which becomes “H”. Output.

By activating the controller 3 by remote control with the activation switch 18 provided in the dresser main body 2 as described above, even when both hands of an operator are occupied to use the dresser main body 2, the controller 3 It becomes possible to start up, the dresser body 2 can be made portable, and workability is improved. And
The remote control start of the controller 3 is performed by the projector 5
By performing an optical signal using the light receiver 6 and the light receiver 6, the optical axes of the light emitter 5 and the light receiver 6 are deviated when the dresser body 2 is rotated during work, and the light pressure is applied from the light emitter 6 of the dresser body 2. The signal is no longer input to the light receiver 6 of the controller 3, and the dressing stops immediately.

In the activation input acceptance circuit 31, the Schmitt trigger inverter 52 is provided on the output side of the photocoupler 51 to prevent the activation signal S4 from chattering. That is, FIG.
As shown in (a), the dressing pressure signal S1 from the light receiver 6
Becomes "L", chattering occurs when the output signal of the photocoupler 51 falls as shown in FIG. 7B, so that this signal is directly used as the activation signal S4 in the gate circuit (AND circuit) 37. When input to, there is a possibility that chattering may occur in the output of the gate circuit 37 as shown in FIG. Therefore,
By outputting the output signal of the photocoupler 51 via the Schmitt trigger inverter 52, FIG.
As shown in (4), a start signal S4 without chattering is generated and output to prevent malfunction.

Next, the part related to the operation preparation will be described. First, the power supply Vc is supplied through the interlock circuit 39.
If c is supplied with power (the controllers 3 of the other devices A and B are not in the operation preparation state), the operation preparation switch 32 is pushed down to output the output signal S5a of the normally open contact a.
Becomes "L", and the output signal S5a becomes FF circuit 53.
Of the normally closed contact b, the output signal S5b of the normally closed contact b becomes “H”, and this output signal S5b is input to the CLR terminal of the FF circuit 53 of the chattering prevention circuit 33.

In this case, since chattering occurs at each contact of the push button type operation preparation switch 32, when the operation preparation switch 31 is pushed down, the normally open contact a of the operation preparation switch 31 is depressed as shown in FIG. The output signal S5a becomes stable after becoming chattering from "H" and then becomes "L" as shown in FIG. 7A, and at this time, the output signal S5b of the normally closed contact b is as shown in FIG. In addition, chattering from "L" occurs for a predetermined time earlier than the operation of the normally open contact a, and then becomes "H", which is stable. Further, when the operation preparation switch 31 is released from being pressed down, the normally open contact a returns faster than the normally closed contact b as shown in the figure, and the output signal S5a causes chattering and shifts to a stable state. After a delay, the output signal S5b causes chattering and shifts to a stable state.

Here, the FF of the chattering prevention circuit 33
Since both the J terminal and the K terminal of the circuit 53 are “H”, when the PR terminal is “L” and the CLR terminal is “H”, the Q output is set to “H” and the PR terminal is set to “H”. When the CLR terminal goes to "L", the Q output goes to "L". Therefore, when the operation preparation switch 31 is pushed down from the FF circuit 53 as shown in FIG.
Becomes "L" from the time when is closed, and the operation preparation switch 32
When the push-down is released, an inverted Q output that becomes “H” when the normally closed contact b is closed is obtained, and this inverted Q output is output as the operation preparation instruction signal S6.

As described above, the operation preparation switch 32 which is a push button type switch having the a-contact and the b-contact.
By combining the output signals including the chattering of each contact of the operation preparation switch 32 using a circuit including the resistors R4 and R5 and the FF circuit 53, the operation preparation instruction signal S6 in which the chattering is removed can be obtained. .

When the chattering prevention circuit 33 outputs the operation preparation instruction signal S6 to the gate circuit 34 in this way, as shown in FIG. 13A, at this time, the start input which is the other input of the gate circuit 34. If the activation signal S4 from the reception circuit 31 is not output, that is, if the activation signal S4 is "L" as shown in FIG. 7B, the output of the gate circuit 34 as shown in FIG. The signal S7 becomes "H", and at this time, the reset signal S8 from the reset signal generating circuit 40 which is the other input of the gate circuit 35 is "L" as shown in FIG. )
As shown in, the output signal S9 from the gate circuit 35 becomes "L".

When the output signal S9 of the gate circuit 35 becomes "L", a signal obtained by inverting the output signal S9 by the inverter 55 is input to the clock terminal CK of the FF circuit 54 of the operation preparation circuit 36. Preparation circuit 3
6 sets the operation preparation signal S10 to "H" at the timing of the fall of the output signal S9 (the rise of the signal inverted by the inverter 55) as shown in FIG.

As a result, the gate circuit 37 is opened to enter a state in which the activation signal S4 from the activation input acceptance circuit 31 can be passed (operation preparation state).
As shown in FIG. 7B, the start input reception circuit 31 receives the dress pressurization signal from the dresser main body 2 and starts the start signal S4.
Is output (set to “H”), the start signal S4 is output to the timing generation circuit 41 and the pressurization valve switching circuit 4
4 is input.

Thereafter, when the start switch 18 of the dresser body 2 is turned off and the start signal S4 from the start input receiving circuit 31 changes from "H" to "L" as shown in FIG. , A reset signal generation circuit 4 as described later.
The reset signal S8 is output from 0 as shown in FIG. 3D (from “L” to “H”), and at this time, the gate circuit 3
Since the output signal S7 of the gate circuit 34 which is the other input of 5 is "L", the output signal S9 of the gate circuit 35 is "L" as shown in FIG. The FF 54 is reset, the operation preparation signal S10 which is its Q output becomes "L", the gate circuit 37 is closed, and the operation preparation state is released.

After the dressing is completed in this way, the operation preparation circuit 3
By inputting the reset signal S8 to 6 to forcibly cancel the operation preparation state, it is possible to prevent forgetting to turn off the operation preparation state and prevent the controller 3 of another machine from entering the operation preparation state forever. The operation for releasing the driving preparation state each time the dress ends is not necessary, and the workability is improved.

As shown in FIGS. 9A and 9B, while the activation signal S4 from the activation input acceptance circuit 31 is being output ("H"), the operation preparation switch 32 is pressed to cause chattering. Even if the operation preparation instruction signal S6 is output from the prevention circuit 33 (the portion indicated by the broken line in (a)), the gate circuit 3
Since the output signal S7 of No. 4 does not change, the operation preparation circuit 36
Is not reset and the operation preparation state is not released.

Therefore, the interlock with the controllers 3 of the other machines A and B will be described. First, when the operation preparation signal S10 is output from the operation preparation circuit 36, the switching transistor TR2 of the switching circuit 60 of the interlock circuit 39 shown in FIG. 6 is turned on.
The leveling indicator lamp 64 lights up to indicate that the controller 3 is in the operation preparation state, and power is supplied to the relays 62 and 63.

As a result, the normally closed contacts CR11, CR12 of the relays 62, 63 are opened, "prohibit start" is output to the controllers 3 of the other machines A, B, and the other machines A, B are operated. It is forbidden to enter the ready state.

On the other hand, when "start prohibition" is input from the controller 3 of the other machine A or B, that is, the normally closed contact CR of the relay 62 of the controller 3 of the other machine A or B of FIG.
When 11 and CR12 are in the open state, power is not supplied from the power supply Vcc to the operation preparation switch 32, so that the operation instruction signal S5 is not output even if the operation preparation switch 32 is pressed (operation of the switch 32 becomes invalid). Therefore, the chattering prevention circuit 33 does not output the operation preparation instruction signal S6, and therefore the operation preparation circuit 36 does not output the operation preparation signal S10.

By thus interlocking with another machine, when the controller is in preparation for operation in order to polish the electrode tip of another machine,
Even if the start switch 18 of the dresser main body 2 is operated, the preparation for driving is not started. As a result, as shown in FIG.
As shown by 0, the same controller 3 is installed in each adjacent welding machine, and dressing can be performed using the common dresser main body 2.

Further, the relay 6 of the switching circuit 60
The relays 6 and 6 shown in FIG.
The second contact point CR21, CR22 is closed, the power supply path to the pressurizing solenoid valve 25 is closed, and the contact point C of the relay 62 is
Since the contacts CR23 and CR24 of R13 and the relay 63 are opened to cut off the power feeding path of the welding timer 8 and cut off the power feeding from the solenoid valve terminal of the welding timer 8, the welding timer 8 does not operate during dressing.

Further, the malfunction prevention circuit 38 includes a resistor R6,
Delay circuit 5 consisting of capacitor C5 and diode D1
5 and the Schmitt trigger inverters 56 and 57 are combined to output a blocking signal S11 that becomes “H” after a predetermined delay time when the power of the controller 3 is turned on while the operation preparation switch 32 is being pressed. Then, the "L" input is applied to the CLR terminal of the FF circuit 54 for a time sufficient for the FF circuit 54 of the operation preparation circuit 36 to be reset to prevent malfunction.

Next, the timing generation circuit 41 operates as shown in FIG.
When the activation signal S4 from the activation input reception circuit 31 is input (becomes "H") as shown in (a), as shown in FIG.
1, a signal S that becomes “L” for a predetermined time (pre-pressurization time t2) determined according to each value of the resistor R10 and the capacitor C7
15 is output, and the signal S of the pre-pressurizing monomulti 65 is output.
When 15 rises to "H", the variable resistor VR2 and the resistor R1 are released from the pressurizing monomulti 66 as shown in FIG.
1 and the signal S16 which is an inverted Q output which becomes “L” for a predetermined time (main pressurization time t3) determined according to each value of the capacitor C8, and the signal S16 of the main pressurizing monomulti 66 is “H”. ", The output signal S17 of the AND circuit 68 is output as shown in FIG.
When the output signal S18 of the NOR circuit 69, which has been inverted to "L", becomes "L" and the activation signal S4 from the activation input acceptance circuit 31 is no longer input (becomes "L"), the signal S18 becomes "H". .

Here, the pre-pressurizing mono-multi 65 and the main pressurizing mono-multi 66 need to be reset when the activation signal S4 is not input, so that each mono-multi 6
The start signal S4 is input to the CLR terminals of 5, 66,
When the start signal S4 is input to the CLR terminals of the pre-pressurization mono-multi 65 and the main pressurization mono-multi 66, the inverted Q output (signal S15) of the pre-pressurization mono-multi 65 is directly input to the main pressurization mono-multi 66. That is, if two mono-multis serving as timers are simply combined to generate a timing corresponding to a predetermined pattern, the pre-loading mono-multi 65 starts from the time when the start signal S4 is input due to the transient characteristics of the mono-multi. Since a delay time is generated until the inverted Q output of "1" becomes "L", there is a disadvantage that the main pressurizing mono-multi 66 also operates when the activation signal S4 is input.

Therefore, in this embodiment, by providing an AND circuit 67 for ANDing the activation signal S4 and the inverted Q output (signal S15) of the pre-pressurizing monomulti 65, the activation signal S4 is in the "H" state. Then, when the inverted Q output of the pre-pressurizing monomulti 65 changes from "L" to "H", the main pressurizing monomulti 66 starts to operate to prevent malfunction due to the transient effect. .

Further, in the reset signal generating circuit 40, the output signal S17 of the AND circuit 68 of the timing generating circuit 41 changes from "L" to "H" and becomes "L" again as shown in FIG. The integrated output S8a from the integrator circuit 71 shown in FIG. 7F is output by the output of the Schmitt trigger inverter 72, as shown in FIG.
Since the signal S8b is output from the same as shown in (f) of FIG.
A reset signal S8 that is "H" is output until 8a rises to a predetermined level. As described above, this makes it possible to prevent forgetting to turn off the driving preparation state.

Next, referring to FIG. 8, the tip dressing pressure setting circuit 43 outputs the signal S15 from the pre-pressing mono-multi 65.
Is in the "L" state, the photocoupler 75 of the interface circuit 42 is in the ON state, and the voltage signal corresponding to the resistance value determined by the resistors R16, R13 and the variable resistor VR3 is the signal S16 from the pressurizing mono-multi 66. During “L”, the photocoupler 76 is turned on and the voltage signal corresponding to the resistance value determined by the resistors R16 and R14 and the variable resistor VR4 is changed to N
While the signal S18 from the OR circuit 69 is "L", the photocoupler 77 is in the ON state, and the voltage signals corresponding to the resistance values determined by the resistors R16 and R15 and the variable resistor VR5 are used as the pressing force level setting signal S2. Output to the electropneumatic proportional valve 24, and the dresser body 2 by the electrode tips 1a and 1b
Set the pressing force of.

Therefore, by adjusting the variable resistors VR3 to VR5, it is possible to set the pressurizing force of the pre-pressurization, the pressurizing force of the main pressurizing, and the pressurizing force after the main pressurizing (finishing pressure). In this case, by using the photocoupler and the diode array to generate one output signal as described above, the space occupied on the board is smaller than that when a switching relay is used, and a resistor and a variable resistor are combined. A wide adjustment range can be obtained by adjusting them.

Further, the welding pressure setting circuit 46 turns on the photocoupler 78 of the interface circuit 45 when the activation signal S4 is not input (when it is "L"), that is, when it is "welding". , The variable resistors VR6 to VR8 and the resistor R from the line selected by the rotary switch 79.
A voltage signal determined according to the resistance value of 17 is output to the electropneumatic proportional valve 24 as a pressing force level setting signal S2 'to set the pressing force of the electrode tips 1a and 1b on the base metal to be welded. Therefore, during welding, the welding pressure can be selected by the rotary switch 79.

Next, the chip dressing procedure using the controller 3 will be described with reference to FIG. 15 as well. After the controller 3 is turned on, the leveling permission lamp 58 is turned on to prepare for operation. If it can be turned on, by pressing the operation preparation switch 32 (PB1), the operation preparation instruction signal S5 is output as shown in FIG. 15 (a), and the operation preparation circuit 36 outputs the operation preparation signal S10. As shown in FIG. 6B, the vehicle is in the driving preparation state. At this time, it is confirmed whether the level indicator lamp 64 is lit.

Therefore, after the cutter holder portion 11 of the dresser body 2 is aligned and set on the electrode tip 1b of the lower gun 1B, as shown in FIG.
By pulling the first stage of the starting switch 18 of FIG. 1 to give a motor command, as shown in FIG.
When the second switch of the start switch 18 is continuously pulled, the dressing pressurizing signal (pressurizing command) is emitted from the projector 5 as shown in FIG. The controller 3 is activated, the pressurizing solenoid valve 25 is actuated to lower the upper gun 1A, and the dresser body 2 is sandwiched between the electrode tips 1a and 1b as shown in FIG. Is pressed. At this time, the pressing force (chip dress pressure) is the electro-pneumatic pressure setting signal S2 for setting the pressing force at the time of pre-pressurization by the chip dress pressure setting circuit 43 according to the signal S15 from the timing generation circuit 41. Since the pressure is output to the proportional valve 24, it is set to a pre-pressurizing force.

In this case, when a problem such as alignment between the electrode tips 1a and 1b and the dresser body 2 occurs,
When the start switch 18 of the dresser main body 2 is turned off, the controller 3 stops operating.

Here, since the applied pressure is set to be higher than the pre-pressurized main pressurizing force and lower than the pre-pressurized final pressurizing force as shown in FIG. It becomes light when pre-pressurizing, and becomes heavy when shifting to main pressurization in the middle,
Further, as the dressing work is continued, the transition to the finishing pressure can be felt with a response and sound. Therefore, when the starting switch 18 is released after a few seconds, the upper gun 1A is opened and the dressing work is completed.

[0085]

As described above, according to the controller of the tip dresser of the first aspect, the remote control signal for instructing the dressing start from the dresser body is received to pressurize the dresser body by the electrode tip of the welding machine. Since the pressing force is controlled, the portability of the dresser main body is improved, and the controller of the portable tip dresser in which the workability of the dressing work is improved can be obtained.

According to the chip dresser controller of the second aspect, when the activation input receiving means receives the remote control signal instructing the dress activation from the dresser main body, the activation signal is output and the timing generating means applies a predetermined pressure. A timing signal corresponding to the pattern is generated and output,
The pressing force (dressing pressure) of the dresser main body by the electrode tip is set according to this timing signal, and the pressurization of the dresser main body is controlled by the switching means according to the start signal, so the starter is instructed by remote control from the dresser main body. By doing so, the electrode tip of the welding machine can pressurize the dresser body to polish the electrode tip, and when the other controller is not in the operation preparation state by the operation preparation switch means, the operation preparation means and the interlock means. Since the start signal is enabled only for the other welding machines, the same controller can be installed in other welding machines to share the dresser body, and one dresser body can start multiple controllers individually. Further, the driving preparation resetting means releases the driving preparation state after the dressing is completed, so that the driving preparation is forgotten. It is possible to prevent the inoperable due, in simple, can operability is good, no malfunction, yet obtain a controller of a portable tip dresser capable of performing high-precision control.

According to the controller of the chip dresser of claim 3, in the controller of the chip dresser of claim 2, the interlock means sends a start prohibition signal to another controller when the operation preparation means is in the operation preparation state. Since the output is made and the operation preparation means is prohibited from being in the operation preparation state when the activation prohibition signal from another controller is being input, the interlock between the controllers can be surely taken. .

According to the controller of the chip dresser of claim 4, in the controller of the chip dresser of claim 3, the interlock means operates by the operation preparation switch means when the activation prohibition signal from the other controller is input. Since the operation preparation instruction is invalidated, the operation preparation instruction itself is prohibited, and the interlock between the controllers can be more surely taken.

According to the tip dresser controller of claim 5, in the controller of the tip dresser according to any one of claims 2 to 4, the output signal of the dressing pressure setting means supplies the actuator for driving the electrode tip of the welding machine. It controls the electro-pneumatic proportional valve that sets the air pressure to be controlled, and controls the pressurizing solenoid valve that switches the supply / cutoff of the air pressure to the actuator with the output signal of the switching means, so it is attached to the welding machine. The electro-pneumatic proportional valve and the pressurizing solenoid valve for driving the electrode tip can be shared with the tip dresser as they are, and the configuration of the tip dresser is simplified.

According to the controller of the tip dresser of claim 6, in the controller of the tip dresser of claim 5, the welding pressurization setting for controlling the electropneumatic proportional valve when the activation signal from the activation input acceptance means is not input. Since the means is provided, the welding pressure of the welding machine can be variably set by using this controller.

[Brief description of the drawings]

FIG. 1 is an overall system configuration diagram showing an embodiment of the present invention.

FIG. 2 is an external perspective view of the dresser body.

FIG. 3 is a block diagram of a controller

FIG. 4 is a circuit diagram showing details of an interlock relationship with the start input acceptance circuit, the pressurizing valve switching circuit and the welding timer 8 of FIG.

FIG. 5 is a chattering prevention circuit, an operation preparation circuit of FIG.
Circuit diagram showing details of malfunction prevention circuit

6 is a circuit diagram showing the details of the interlock circuit of FIG.

FIG. 7 is a circuit diagram showing details of the timing generation circuit of FIG.

FIG. 8 is a circuit diagram showing details of the tip dress pressure setting circuit, the welding pressure setting circuit, etc. of FIG.

[Figure 9] External view of the controller

FIG. 10 is an explanatory diagram illustrating a connection relationship between controllers.

FIG. 11 is a timing diagram used to explain the operation of the startup input acceptance circuit.

FIG. 12 is a timing chart for explaining the operation of the chattering prevention circuit.

FIG. 13 is a timing chart for explaining the operation related to the driving preparation.

FIG. 14 is a timing diagram for explaining the operation related to timing generation.

FIG. 15 is an explanatory diagram for explaining tip dressing work.

[Explanation of symbols]

1A ... upper gun, 1B ... lower gun, 1a, 1b ... electrode tip, 2 ... dresser body, 3 ... controller, 4 ... pressurizing drive system, 5 ... projector, 6 ... photoreceiver, 8 ... welding timer, 1
2 ... Polishing tip, 13 ... Motor, 18 ... Start switch,
24 ... Pneumatic proportional valve, 25 ... Pressurizing solenoid valve, 31
... Startup input acceptance circuit, 32 ... Operation preparation switch, 33 ...
Chattering prevention circuit, 34, 35, 37 ... Gate circuit, 36 ... Operation preparation circuit, 39 ... Interlock circuit,
40 ... Reset signal generating circuit, 41 ... Timing generating circuit, 43 ... Chip dress pressure setting circuit, 44 ... Pressurizing valve switching circuit, 46 ... Welding pressurizing setting circuit.

Claims (6)

[Claims] 1. A portable dresser body having a drive source for driving a cutting tool for polishing an electrode tip of a welding machine,
A controller of a tip dresser for polishing the electrode tip by driving the cutting tool in a state where the cutting tool of the dresser body is pressed by the electrode tip, the controller being a remote for instructing a dressing start from the dresser body. A controller for a tip dresser, comprising means for receiving a control signal and controlling pressurization and pressing force of the dresser body by the electrode tip. 2. A portable dresser body having a drive source for driving a cutting tool for polishing an electrode tip of a welding machine,
A controller of a tip dresser for polishing the electrode tip by driving the cutting tool in a state where the cutting tool of the dresser body is pressed by the electrode tip, the controller being a remote for instructing a dressing start from the dresser body. Start-up input receiving means for receiving a control signal and outputting a start-up signal, timing generating means for generating and outputting a timing signal according to a predetermined pressurization pattern based on the start-up signal from the start-up input receiving means, and this timing generation Dressing pressure setting means for setting the pressing force of the dresser body by the electrode tip in accordance with a timing signal from the means, and pressurization / non-pressurization of the dresser body by the electrode tip in response to a start signal from the start input receiving means. Switching means that controls the switching of pressurization and operating standards that instruct the operation preparation. An interface is provided between the switch means, the operation preparation means that makes the start signal output by the start input reception means valid according to the operation preparation instruction signal from the operation preparation switch means, and the other controller. An interlock means for locking and a driving preparation resetting means for releasing the driving preparation state by the driving preparation means when a starting signal is no longer output from the starting input receiving means are provided. controller. 3. The chip dresser controller according to claim 2, wherein the interlock means outputs a start prohibition signal to another controller when the operation preparation means is in the operation preparation state, and the interlock means outputs from the other controller. A chip dresser controller, characterized in that it comprises means for prohibiting the operation preparation means from entering the operation preparation state when a start prohibition signal is input. 4. The chip dresser controller according to claim 3, wherein the interlock means invalidates an operation preparation instruction by the operation preparation switch means when a start prohibition signal is input from another controller. A chip dresser controller characterized by comprising means. 5. The tip dresser controller according to claim 2, wherein the dressing pressure setting means sets an air pressure supplied to an actuator that drives an electrode tip of the welding machine. Control the
A chip dresser controller, wherein the switching means controls a pressurizing solenoid valve that opens and closes an air pressure supply path to the actuator. 6. The tip dresser controller according to claim 5, wherein the welding pressure setting is performed by controlling the electropneumatic proportional valve to set the welding pressure when the activation signal from the activation input receiving means is not input. A chip dresser controller characterized in that means are provided.