JP3585577B2 - Equipment starter - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a device starting device, for example, a device for starting a device such as a portable tip dresser for dressing (polishing) an electrode tip of a welding machine such as a stationary spot welding machine or a multi-spot welding machine.
[0002]
[Prior art]
In spot spot welding machines such as stationary spot welding machines and multi-spot welding machines, if the shape is deformed due to repeated wear and tear of the electrode tip due to repeated pressurization and energization, welding quality cannot be ensured. A tip dresser for polishing an electrode tip is used.
[0003]
As a conventional chip dresser, for example, as disclosed in JP-A-1-181985, a moving body is supported on a frame fixed on a base so as to be able to move up and down, and a dresser body is fixed to the moving body. A cutter blade that is driven to rotate by an air motor is attached to the dresser body, and the electrode tip is polished by rotating the cutter blade with an air motor while pressing the electrode tip from above and below the cutter blade. Type tip dressers are known.
[0004]
[Problems to be solved by the invention]
However, in the conventional tip dresser described above, since one stationary tip dresser must be installed corresponding to one welding machine, the size of the welding equipment and the cost are increased. There are issues.
[0005]
Therefore, the dresser body is made portable so that the operator can carry it to the installation location of the welding machine so that the electrode tip can be appropriately polished, and a drive source for driving the blade tool to reduce the burden of dressing work is provided on the dresser body. A portable tip dresser (portable dresser) provided is conceivable.
[0006]
By the way, in such a portable tip dresser, a controller for controlling the operation of the welding machine is required in order to perform the tip dressing operation, and this controller must be activated when performing the tip dressing operation. In this case, when the work is carried out by holding the dresser body with both hands, it becomes difficult to give the start command to the controller together with the start of the dresser body.
[0007]
The present invention has been made in view of the above points, and has as its object to facilitate the start-up operation of a device main body and a device provided with a control device separate from the device main body.
[0008]
[Means for Solving the Problems]
In order to solve the above problems,According to the present invention, in a tip dresser including a portable dresser main body having a drive source that rotationally drives a cutting tool for polishing an electrode tip of a welding machine and a separate control device, the dresser main body side includes the dresser. A two-stage switch for instructing activation of the main body and the control device is provided. The first stage of the two-stage switch drives the drive unit of the dresser body, and the second stage is at least portable when the start of the control device is commanded in addition to the drive command. And a start command output means for outputting a start command by an optical signal to the control device. Further, the control device includes at least a photodetector and a Schmitt trigger inverter having a capacitor connected to the input side, and a start input receiving means for receiving a start command by an optical signal from the start command output means, and a dresser at the time of work. When the main body is rotated or the like, the optical axes of the light emitter and the light receiver are shifted, so that the dress pressure signal is not input from the light emitter of the dresser body to the light receiver of the controller, and the dress is immediately stopped.
[0010]
[Action]
The device activation device according to claim 1 outputs an activation command by an optical signal from the device main body to the control device by instructing activation of the device main body and the control device by a switch provided on the device main body side, Since the control device starts by receiving the start command by the optical signal, the start operation of the device is facilitated, and by using the optical signal, the control device can be stopped when a positional displacement of the device body occurs. become able to.
[0011]
The starting device of the device according to claim 2, wherein the starting input receiving means on the control device side inputs a starting command signal corresponding to the input starting command, and a light receiving element for receiving emission light of the light emitting device. Also, since it has the Schmitt trigger element provided on the output side of the light receiving element, chattering of the signal output from the light receiving element can be prevented, and the control device can be prevented from malfunctioning.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall system configuration diagram showing an embodiment of a chip dresser to which an apparatus for activating a device according to the present invention is applied, FIG. 2 is an external perspective view of a dresser body, FIG. 3 is a block diagram of a controller, and FIG. FIG. 5 is a circuit diagram showing details of an interlock relationship between a start input receiving circuit, a pressurizing valve switching circuit, and a welding timer 8 of FIG. 5, and FIG. 5 is a circuit showing details of a chattering prevention circuit, an operation preparation circuit, and a malfunction prevention circuit of FIG. 6 is a circuit diagram showing details of the interlock circuit of FIG. 3, FIG. 7 is a circuit diagram showing details of the timing generation circuit of FIG. 3, and FIG. 8 is a tip dress pressure setting circuit of FIG. FIG. 9 is a circuit diagram showing details of a setting circuit and the like, FIG. 9 is an external view of a controller, and FIG. 10 is an explanatory diagram for explaining a connection relationship between controllers.
[0013]
The tip dresser system includes a portable dresser body (equipment body) 2 having a drive source for rotating and driving a blade for polishing electrode tips 1a and 1b of an upper gun 1A and a lower gun 1B of a welding machine, and the dresser. A controller (control device) 3 that controls the polishing (dressing) of the electrode chips 1a and 1b using the main body 2, and the dresser main body 2 is pressurized by the electrode chips 1a and 1b under the control of the controller 3 during dressing. And a light-emitting device (start-up command output means) 5 and a light-receiving device 6 for giving a dress start-up command (start-up command) from the dresser body 2 to the controller 3 by remote control. I have.
[0014]
As shown in FIG. 2, the dresser body 2 rotatably holds a polishing tip (blade) 12 for polishing the electrode tips 1 a and 1 b at a tip end of the cutter holder 11, and a drive attached to a base of the cutter holder 11. The polishing tip 12 is rotationally driven by a motor 13 as a source via a driving force transmission mechanism provided in the holder portion 11. A grip 14 is attached to the base of the cutter holder 11, and a battery 15 serving as a power source for the motor 13 is detachably attached to the rear end of the grip 14, and an auxiliary grip is attached to the side of the holder 11. The part 16 is attached.
[0015]
Further, the projector 5 for remote control is provided in the case at the base of the cutter holder 11 on the side of the motor 13, and an activation switch (switch means) 18 is provided on the lower surface of the grip 14. The start switch 18 uses a two-stage switch to instruct the rotation of the motor 13 in the first stage, and in addition to this, instructs the start of the dress in the second stage. A pressure signal (start command signal) is emitted.
[0016]
The pressurizing drive system 4 is used in common with the pressurizing drive system of the welding machine itself, and supplies air from an air source to an electropneumatic proportional valve 24 via a filter 21, a regulator 22 and a lubricator 23. The electropneumatic proportional valve 24 controls the supplied air to an air pressure according to the control voltage and sends out the air. The air from the electropneumatic proportional valve 24 is supplied via a pressurized solenoid valve 25 to a cylinder 26 for driving (falling) the upper gun 1A (electrode tip 1a). The pressure solenoid valve 25 opens and closes an air supply path according to a control signal. Therefore, the controller 3 outputs a pressure level setting signal S2 to the electropneumatic proportional valve 24 to control the pressure level (dress pressure), and outputs a pressurization signal S3 to the pressure solenoid valve 24 to pressurize / non-press. The pressurization is controlled by switching.
[0017]
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 to the controller 3. You are typing.
[0018]
As shown in FIG. 3, the controller 3 includes a start input receiving circuit 31, a start preparation switch 32, a chattering prevention circuit 33, gate circuits 34 and 35, and a start preparation circuit 36, which are start input receiving means including the light receiver 6. , Gate circuit 37, malfunction prevention circuit 38, interlock circuit 39, reset signal generation circuit 40, timing generation circuit 41, interface circuit 42 and chip dress pressure setting circuit 43, pressurizing valve switching circuit 44, interface circuit 45, and welding A pressure setting circuit 46 and the like are provided.
[0019]
The start input receiving circuit 31 receives a dress press signal (start command) based on an optical signal, which is a remote control signal emitted from the light projector 5 of the dresser body 2, by the light receiver 6, and pressurizes the dress from the light receiver 6. From the signal S1, an activation signal S4 for pressurizing the dresser body 2 by the electrode tips 1a and 1b is generated and output.
[0020]
The operation preparation switch 32 is composed of an illuminated push button switch and outputs an operation preparation instruction signal S5. The chattering prevention circuit 33 shapes an output signal (operation preparation instruction signal S5) of the operation preparation switch 32, generates and outputs an operation preparation instruction signal S6. The gate circuit 34 receives the operation preparation instruction signal S6 from the chattering prevention circuit 33 and the start signal S4 from the start input receiving circuit 31, and outputs a signal S7 corresponding to these input signals. The gate circuit 35 receives the output signal S7 of the gate circuit 34 and the output signal S8 from the reset signal generation circuit 40, and outputs a signal S9 corresponding to these input signals.
[0021]
The operation preparation circuit 36 outputs the operation preparation signal S10 to the gate circuit 37 according to the output signal S9 of the gate circuit 35, and also outputs the operation preparation signal S10 to the interlock circuit 39. When the operation preparation signal S10 from the operation preparation circuit 36 is input, the gate circuit 38 enters an open state in which the input of the start signal S4 from the start input accepting circuit 31 to the timing generation circuit 41 is permitted (this state is assumed to be this state). "Operation ready state"). The start signal S4 from the gate circuit 38 is also input to the welding pressure setting circuit 46 via the pressure valve switching circuit 44 and the interface circuit 45 in addition to the timing generation circuit 41.
[0022]
The malfunction prevention circuit 38 outputs the operation preparation instruction signal S6 from the chattering prevention circuit 33 and the inhibition signals S11 and S12 for preventing the operation preparation signal S10 from being output from the operation preparation circuit 36 when the dress power is turned on.
[0023]
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 is an adjacent welding machine. The reset signal generation circuit 40 receives the signal S13 output from the timing generation circuit 41 at the end of dressing, generates a reset signal S8, and outputs the reset signal S8 to the operation preparation circuit 36 via the gate circuit 35.
[0024]
The timing generation circuit 41 generates a timing signal corresponding to a predetermined pressure pattern based on the activation signal S4 from the activation input reception circuit 31, and outputs the timing signal to the chip dress pressure setting circuit 43 via the interface circuit. Here, the “predetermined pressurization pattern” indicates a relationship between the dress pressure and the time for applying the dress pressure. In the present embodiment, the pressurizing force is determined by pre-pressing, main pressing, and finishing pressure. The timing is set in three stages (see FIG. 15), and the time for applying the pre-pressurizing force is set as the pre-pressurizing time, and the time for applying the main pressurizing force is set as the main pressurizing time. Timing signals for the pressure time and the main pressure time are generated.
[0025]
The tip dress pressure setting circuit 43 converts the pressure level setting signal S2, which is a voltage signal for setting the pressure applied to the dresser body 2 by the electrode chips 1a and 1b, according to the timing signal from the timing generation circuit 41, to the electropneumatic. Output to the proportional valve 24. The pressurizing valve switching circuit 44 outputs a pressurizing signal S3 to the pressurizing solenoid valve 25 in response to a start signal S4 from the start input receiving circuit 31, and pressurizes / non-presses the dresser body 2 by the electrode chips 1a and 1b. Switch pressurization.
[0026]
The welding pressure setting circuit 46 is a pressing force level setting signal S2 which is a voltage signal for setting the pressing force at the time of welding in response to the start signal S4 from the start input receiving circuit 31 input via the interface circuit 45. 'To the electropneumatic proportional valve 25.
[0027]
Next, details of each unit will be described with reference to FIG.
Referring to FIG. 4, the light receiving device 6 of the start input receiving circuit 31 is operated by operating the start switch 18 with the dresser body 2 set in a required posture between the electrode tips 1a and 1b on the welding machine side. When a dress pressurizing signal is emitted from 5, it is installed at a position for receiving the dress pressurizing signal.
[0028]
As shown in FIG. 4, the start-up input receiving circuit 31 includes a photodiode PD1, which is a light emitting element that is turned on / off by a dress pressing signal S1 from the output transistor TR1 of the light receiver 6, and the photo diode PD1. A photocoupler 51 comprising a phototransistor PTR1 which is a light receiving element for receiving the light emitted from the diode PD1, a Schmitt trigger inverter 52 which is a Schmitt trigger element, a resistor R1 and a capacitor C1 on the input side, a resistor R2 on the output side, and the like. And a start signal S4 from the Schmitt trigger inverter 52 in response to the dress pressure signal S1 from the light receiver 6.
[0029]
Referring to FIG. 5, the operation preparation switch 32 is a push button (PB) switch having a normally open contact a and a normally closed contact b as shown in FIG. The anti-chattering circuit 33 includes pull-up resistors R4 and R5 for pulling up the normally open contact a and normally closed contact b of the operation preparation switch 32 to the power supply Vcc via the resistor R3 and the interlock circuit 39, and positive edge going. A JK flip-flop (hereinafter referred to as “FF”) circuit 53 and capacitors C3 and C4.
[0030]
The FF circuit 53 grounds the J terminal, the K terminal, and the CK (clock) terminal, inputs the output signal S5a of the normally open contact a of the operation preparation switch 32 to the preset (PR) terminal, and operates the clear (CLR) terminal. The output signal S5b of the normally closed contact b of the preparation switch 32 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.
[0031]
The gate circuit 34 outputs a signal S7 which becomes “H” when the activation signal S4 from the activation input reception circuit 31 is “L” and the operation preparation instruction signal S6 from the chattering prevention circuit 33 is “L”. . The gate circuit 35 outputs a signal S9 that becomes “H” 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”.
[0032]
The operation preparation circuit 36 includes a positive-edge-going type JK FF circuit 54 and a Schmitt trigger inverter 55. The FF circuit 54 connects the J terminal, the K terminal, and the PR terminal to the power supply VDD, inputs the output signal S9 of the gate circuit 35 to the CK terminal via the Schmitt trigger inverter 55, and outputs the signal from the malfunction prevention circuit 38 to the CLR terminal. Is input. 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 opened while the operation preparation signal S10 from the operation preparation circuit 36 is “H”, and passes the start signal S4 from the start input reception circuit 31.
[0033]
The malfunction prevention circuit 38 includes a delay circuit 55 including a resistor R6, a capacitor C5, and a diode D1, and Schmitt trigger inverters 56 and 57. The delay circuit 55 delays the rise of the voltage level at the point P1, and the Schmitt trigger inverter The inhibition signal S11 obtained through 56 and 57 is output to the FF circuit 54 of the operation preparation circuit 36.
[0034]
A parallel circuit of a zener diode ZD1 and a capacitor C6 is connected between a power supply path (point P1) from the interlock circuit 39 to the chattering prevention circuit 33 and the ground to prevent voltage fluctuation. Between the connection point with R3 and the ground, a continuation permission display lamp 58 for displaying the operation preparation permission is connected via a resistor R7.
[0035]
As shown in FIG. 6, the interlock circuit 39 is a switching circuit 60 that is turned on and off by an operation preparation signal S10 from the operation preparation circuit 36, and the switching circuit 60 controls the controller 3 of the other machines A and B. An activation inhibition input / output system 61 for outputting activation inhibition and inputting activation inhibition from the controllers 3 of the other devices A and B is provided.
[0036]
The switching circuit 60 is supplied with an operation preparation signal S10 from the operation preparation circuit 36 via a resistor R8 to be turned on and off, and is supplied with power when the switching transistor TR2 is turned on. It comprises a relay 62, 63, a backflow prevention diode D2 connected in parallel with these relays 62, 63, a run-in indicator lamp 64 for indicating that the controller 3 is in an operation ready state, and a resistor R9. .
[0037]
When the start prohibition input / output system 61 is connected to the start prohibition input / output system of the controller 3 of the other machines A and B, the start prohibition input / output system 61 is 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. The normally closed contact CR11 of the relay 62 of the switching circuit 60 is similarly disposed 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. At the same time, power is supplied from the power supply Vcc to the operation preparation switch 32 via the normally closed contact CR12 of the relay 62 of the controller 3 of the other machine A and / or B.
[0038]
Next, referring to FIG. 7, the timing generation circuit 41 sets a pre-pressurizing mono-multi 65 composed of a dual retriggerable monostable multi-vibrator and a pulse width (pre-pressurizing time) of the mono-multi 65. The variable resistor VR1, the resistor R10, the capacitor C7, the main pressurizing mono-multi 66 composed of the dual retriggerable monostable multivibrator, and the pulse width (main pressurizing time) of the mono-multi 66 are set. , A variable resistor VR2, a resistor R11, a capacitor C8, AND circuits 67 and 68, and a NOR circuit 69.
[0039]
The start signal S4 from the start input receiving circuit 31 is input to the pre-press mono-multi 65 through the gate circuit 37, and the signal S15, which is the inverted Q output of the pre-press mono-multi 65, and the start signal S4 are ANDed. The output of the AND circuit 67 is input to the mono-multi for pressurization 66, and the inverted Q output (signal) S15 of the mono-multi 65 for pre-pressurization and the inverted Q output (signal) of the mono-multi 66 for pressurization S16 and the start signal S4 are input to the AND circuit 68.
[0040]
The inverted Q output S15 of the pre-pressurizing monomulti 65, the inverted Q output S16 of the main pressurizing monomulti 66, and the output S18 of the AND circuit 68 inverted by the NOR circuit 69 are output via the interface circuit 42, respectively. The output is output to the chip dress pressure setting circuit 43 and the output S17 of the AND circuit 68 is output to the reset signal generation circuit 40.
[0041]
The reset signal generation circuit 40 receives the integration circuit 71 including the resistor R12 and the capacitor C10 and the output S17 of the AND circuit 68 as one input as they are, and inverts the integration output S8a from the integration circuit 71 by the Schmitt trigger inverter 72. A gate circuit 73 receives the signal S8b as the other input, and outputs a reset signal S8 to the operation preparation circuit 36 via the gate circuit 35 when the output S17 of the AND circuit 68 becomes "L".
[0042]
Next, referring to FIG. 8, the dress system interface circuit 42 includes an inverted Q output S15 of the pre-pressurizing mono-multi 65 of the timing generation circuit 41, an inverted Q output S16 of the main pressurizing mono-multi 66, and a NOR circuit 69. , And three photocouplers 75 to 77 to which the respective outputs S18 are input. The chip dress pressure setting circuit 43 includes resistors R13 to R15, variable resistors VR3 to VR5 connected to the output side of each of the photocouplers 75 to 77 of the interface circuit 42, a resistor R16 and diodes D3 to D5, and includes a variable resistor VR3. A voltage signal corresponding to the resistance value of VR5 to VR5 is output to the electropneumatic proportional valve 24 as a pressure level setting signal S2.
[0043]
The welding-related interface circuit 45 includes a photocoupler 78 that inputs a start signal S4 from the start input receiving 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, variable resistors VR6 to VR8, a resistor R17, and diodes D6 to D8, according to the resistance values of the variable resistors VR6 to VR8. The output voltage signal is output to the electropneumatic proportional valve 24 as a pressure level setting signal S2 '.
[0044]
Next, returning to FIG. 4, the pressurizing valve switching circuit 44 includes a switching transistor TR3, a phototriac 81, a surge absorbing element 82, and resistors R19 and R20, and gates a start signal S4 from the start input receiving circuit 31. The start signal S4 is input to the transistor TR3 via the resistor R19, and the output terminal of the phototriac 81 is interposed in the power supply path to the pressure solenoid valve 25. Switching. The normally open contacts CR21 and CR22 of the relay 63 of the interlock circuit 39 are provided on the power supply path to the pressure solenoid valve 25.
[0045]
The normally closed contact CR13 of the relay 62 of the interlock circuit 39 outputs the power to the welding timer 8 at the time of dressing, and the normally closed contacts CR23 and CR24 of the relay 63 shuts off the solenoid valve terminal of the welding timer 8 at the time of dressing. Like that. In addition, a power supply circuit 83, a power-on display lamp 84, and the like are provided.
[0046]
As shown in FIG. 9, the controller 3 described above can externally operate the operation preparation switch 32, the rotary switch 79 for selecting the welding pressure, the variable resistors VR1 and VR2 for setting the dress time, and the variable resistors VR3 to VR5 for setting the dress pressure. In addition, a continuation permission display lamp 58, a continuation ON display lamp 64, and a power ON display lamp 84 are also disposed. Here, each of the variable resistors VR1 to VR5 is provided so as to be operable externally while being installed on the internal PCB substrate.
[0047]
Then, as shown in FIG. 10, the controllers 3, 3, 3,... Are respectively installed in a plurality of (here, only three) welding machines WA, WB, WC. The start prohibition input / output terminals of the lock circuit 39 are connected to each other. For example, the start prohibition output terminal of the controller 3 of the welding machine WA is connected to the start prohibition input terminal of the controller 3 of the welding machines WB and WC (corresponding to the other machines A and B in the above description). Are connected to the start prohibition output terminals of the controllers 3 of the welding machines WB and WC, respectively.
[0048]
Next, the operation of the chip dresser system configured as described above will be described with reference to FIGS.
First, the start input relationship will be described. With the cutter holder 11 of the dresser main body 2 set and positioned on the electrode tip 1b of the lower gun 1B, pull out the first stage of the start switch 18 of the dresser main body 2 and pull out the motor. When a command is given to drive the motor 13 and the start switch 18 is continuously pulled down, a dress pressurizing signal (start command) is emitted from the projector 5 of the dresser body 2 as an optical signal. At this time, if the optical axis of the projector 5 of the dresser main body 2 and the optical axis of the light receiver 6 of the controller 3 coincide, the start command emitted from the dresser main body 2 is received by the light receiver 6 of the controller 3 side. .
[0049]
When the light-receiving device 6 of the controller 3 receives the start command from the light-emitting device of the dresser body 2 in this way, the start input receiving circuit 31 turns on the transistor TR1 of the light-receiving device 6 and generates the dress pressure signal S1. When the signal 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 a start signal S4 that becomes “H”.
[0050]
Thus, the start switch 18 for instructing the dresser main body 2 to start the drive source of the dresser main body 2 and for starting the controller 3 is provided. A start command signal is output as a signal, and the start command signal is received on the controller 3 side to generate a start signal. Therefore, even when both hands of an operator are blocked to use the dresser body 2, the controller 3 can be used. 3, the dresser main body 2 can be made portable, and its operability and operability are improved. Then, the remote control of the controller 3 is started by an optical signal using the light emitter 5 and the light receiver 6, so that the optical axis of the light emitter 5 and the light receiver 6 is shifted when the dresser body 2 is rotated during work. Then, the dress pressurizing signal from the projector 6 of the dresser body 2 is not input to the light receiver 6 of the controller 3, and the dressing is immediately stopped.
[0051]
In addition, the start input receiving circuit 31 prevents the occurrence of chattering in the start signal S4 by interposing a Schmitt trigger inverter 52 on the output side of the photocoupler 51. That is, when the dress pressure signal S1 from the light receiver 6 becomes “L” as shown in FIG. 11A, and when the output signal of the photocoupler 51 falls as shown in FIG. Since chattering occurs, if this signal is input as it is to the gate circuit (AND circuit) 37 as the activation signal S4, chattering will occur in the output of the gate circuit 37 as shown in FIG. There is. Therefore, by outputting the output signal of the photocoupler 51 through the Schmitt trigger inverter 52, a start signal S4 without chattering is generated and output as shown in FIG.
[0052]
Next, a part related to the operation preparation will be described. First, assuming that the power supply Vcc is supplied via the interlock circuit 39 (the controller 3 of the other machines A and B is not in the operation ready state), the operation preparation switch 32 is depressed to output the normally open contact a. The signal S5a becomes "L", the output signal S5a is input to the PR terminal of the FF circuit 53, the output signal S5b of the normally closed contact b becomes "H", and the output signal S5b is output from the chattering prevention circuit 33. The signal is input to the CLR terminal of the FF circuit 53.
[0053]
In this case, since chattering occurs at each contact of the push button type operation preparation switch 32, as shown in FIGS. 12A and 12B, when the operation preparation switch 32 is pressed down and released, the normally open state is established. Chattering occurs in the output signal S5a of the contact a and the output signal S5b of the normally closed contact b. However, the FF circuit 53 of the chattering prevention circuit 33 has the PR terminal because the J terminal and the K terminal are both "H". To make the Q output "H" when the CLR terminal becomes "H" at "L" and to make the Q output "L" when the PR terminal is "H" and the CLR terminal becomes "L" When the operation preparation switch 31 is depressed from the FF circuit 53 as shown in FIG. 3 (c), it becomes “L” from the time when the normally open contact a is closed, and when the operation preparation switch 32 is released from being depressed, Always Contact b inverted Q output becomes "H" is obtained when closed, the inverted Q output no chattering is outputted as an operation preparation instruction signal S6.
[0054]
When the chattering prevention circuit 33 outputs the operation preparation instruction signal S6 to the gate circuit 34 as shown in FIG. 13A, the start input receiving circuit 31 which is the other input of the gate circuit 34 at this time. Is not output, that is, if the activation signal S4 is "L" as shown in FIG. 3B, the output signal S7 of the gate circuit 34 becomes as shown in FIG. At this time, the reset signal S8 from the reset signal generation circuit 40, which is the other input of the gate circuit 35, is at "L" as shown in FIG. As described above, the output signal S9 from the gate circuit 35 becomes “L”.
[0055]
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. Sets the operation preparation signal S10 to "H" at the falling edge of the output signal S9 (rising edge of the signal inverted by the inverter 55), as shown in FIG.
[0056]
As a result, the gate circuit 37 is opened to enter a state in which the start signal S4 from the start input receiving circuit 31 can be passed (operation preparation state). Thereafter, as shown in FIG. When the circuit 31 receives the dress pressurizing signal from the dresser main body 2 and outputs a start signal S4 (turns it to “H”), the start signal S4 is input to the timing generating circuit 41 and the pressurizing valve switching circuit 44. .
[0057]
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. Thus, the reset signal S8 is output from the reset signal generation circuit 40 (from "L" to "H") as shown in FIG. 4D, and the output of the gate circuit 34 which is the other input of the gate circuit 35 at this time. Since the signal S7 is "L", the output signal S9 of the gate circuit 35 becomes "L" as shown in FIG. 3E, and the FF 54 of the operation preparation circuit 36 is reset to the Q output. The operation preparation signal S10 becomes "L", the gate circuit 37 is closed, and the operation preparation state is released.
[0058]
After the dressing is completed, the reset signal S8 is input to the operation preparation circuit 36 to forcibly cancel the operation preparation state, thereby preventing the operation preparation state from being forgotten to be cut off. It is possible to prevent a situation where the user cannot enter the ready state, and it is not necessary to release the operation ready state every time the dress is completed, thereby improving workability.
[0059]
Also, as shown in FIGS. 7A and 7B, while the start signal S4 is being output from the start input receiving circuit 31 ("H"), the operation preparation switch 32 is pressed and the chattering preventing circuit 33 is pressed. Even if the operation preparation instruction signal S6 is output from the controller (part indicated by a broken line in FIG. 7A), the output signal S7 of the gate circuit 34 does not change, so that the operation preparation circuit 36 is reset and the operation preparation state is released. There is no.
[0060]
Therefore, an interlock between the other devices A and B and the controller 3 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. It is displayed that the controller 3 is in the operation preparation state, and power is supplied to the relays 62 and 63.
[0061]
As a result, the normally closed contacts CR11 and CR12 of the relays 62 and 63 are opened, and “start prohibition” is output to the controllers 3 of the other machines A and B, so that the other machines A and B are ready for operation. It is forbidden to enter.
[0062]
On the other hand, when “start prohibition” is input from the controller 3 of the other device A or B, that is, the normally closed contacts CR11 and CR12 of the relay 62 of FIG. Is not supplied from the power supply Vcc to the operation preparation switch 32, the operation instruction signal S5 is not output even if the operation preparation switch 32 is pressed (the operation of the switch 32 is invalidated). The preparation instruction signal S6 is not output, and therefore, the operation preparation signal S10 is not output from the operation preparation circuit 36.
[0063]
As described above, by interlocking with the other machine, the operation switch 18 of the dresser main body 2 can be operated even when the controller is ready for operation for polishing the electrode tip of the other machine. You will not be ready for operation. Thereby, as shown in FIG. 10 described above, the same controller 3 can be installed in each of the adjacent welding machines, and dressing can be performed using the common dresser body 2.
[0064]
When the relays 62 and 63 of the switching circuit 60 operate, the contacts CR21 and CR22 of the relay 62 shown in FIG. 4 are closed to close the power supply path of the pressurized solenoid valve 25HR. The contacts CR23 and CR24 of 63 are opened to cut off the current supply to the welding timer 8 and cut off the power supply from the solenoid valve terminal of the welding timer 8, so that the welding timer 8 does not operate at the time of dressing.
[0065]
Further, the malfunction prevention circuit 38 is provided with a combination of the delay circuit 55 including the resistor R6, the capacitor C5 and the diode D1, and the Schmitt trigger inverters 56 and 57, so that the power of the controller 3 is turned on while the operation preparation switch 32 is pressed. When this is done, a blocking signal S11 that becomes "H" after a predetermined delay time has elapsed is output, and "L" is input to the CLR terminal of each FF circuit 54 for a time sufficient for the FF circuit 54 of the operation preparation circuit 36 to be reset. To prevent malfunction.
[0066]
Next, when the start signal S4 from the start input receiving circuit 31 is input (becomes “H”) as shown in FIG. 14 (a), the timing generation circuit 41 as shown in FIG. 14 (b) The pre-pressing monomulti 65 outputs a signal S15 that becomes “L” for a predetermined time (pre-pressing time t2) determined according to the values of the variable resistor VR1, the resistor R10, and the capacitor C7. When the signal S15 at 65 rises to "H", as shown in FIG. 3C, a predetermined time (main pressurization) determined from the main pressurizing mono-multi 66 according to each value of the variable resistor VR2, the resistor R11 and the capacitor C8. A signal S16, which is an inverted Q output that becomes "L" for a time t3), is output. When the signal S16 of the main mono-multi 66 for pressurization rises to "H", an AND circuit 68 as shown in FIG. Output signal S When the output signal S18 of the NOR circuit 69 obtained by inverting the signal 7 ((d) in FIG. 7) becomes "L" and the start signal S4 from the start input receiving circuit 31 is no longer input (to "L"). The signal S18 becomes "H".
[0067]
Here, since the pre-pressurizing mono-multi 65 and the main pressurizing mono-multi 66 need to be reset when the start signal S4 is not input, the start signal S4 is input to the CLR terminals of the mono-multis 65 and 66. However, when the start signal S4 is input to the CLR terminals of the pre-pressurizing monomulti 65 and the main pressurizing monomulti 66, the inverted Q output (signal S15) of the prepressurizing monomulti 65 is directly input to the main pressurizing monomulti. When the start signal S4 is inputted from the input signal of the start signal S4 due to the transient characteristics of the monomulti, the input to the pre-pressurization is performed by combining two monomultis serving as timers. Since a delay time occurs before the inverted Q output of the mono-multi 65 becomes “L”, when the start signal S4 is inputted, Caused a disadvantage that the mono-multi 66 also ends up working.
[0068]
Therefore, in the present embodiment, by providing an AND circuit 67 that performs an AND operation between the start signal S4 and the inverted Q output (signal S15) of the pre-pressurizing mono-multi 65, the pre-loading is performed when the start signal S4 is in the “H” state. When the inverted Q output of the pressure mono-multi 65 changes from "L" to "H", the pressure mono-multi 66 is started to operate, thereby preventing a malfunction due to a transient effect.
[0069]
Also, the reset signal generation circuit 40 changes the output signal S17 of the AND circuit 68 of the timing generation circuit 41 from “L” to “H” and changes to “L” again, as shown in FIG. An integration output S8a from the integration circuit 71 as shown in FIG. 11F is output, and a signal S8b as shown in FIG. 11F from the Schmitt trigger inverter 72 as shown in FIG. Therefore, the reset signal S8 which becomes "H" is output from the time when the activation signal S4 becomes "L" to the time when the integral output S8a rises to a predetermined level. As described above, it is possible to prevent the operator from forgetting to turn off the operation preparation state.
[0070]
Next, referring to FIG. 8, while the signal S15 from the pre-pressurization mono-multi 65 is “L”, the chip coupler pressure setting circuit 43 turns on the photocoupler 75 of the interface circuit 42, and the resistance R16, A voltage signal corresponding to the resistance value determined by R13 and the variable resistor VR3 is supplied to the photocoupler 76 while the signal S16 from the pressurizing mono-multi 66 is “L”, and the resistors R16 and R14 and the variable resistor VR4 are turned on. The voltage signal according to the resistance value determined by the resistors R16 and R15 and the variable resistor VR5 while the signal S18 from the NOR circuit 69 is "L" while the photocoupler 77 is in the ON state. The signal is output to the electropneumatic proportional valve 24 as a pressure level setting signal S2 to set the pressure of the dresser body 2 by the electrode tips 1a and 1b.
[0071]
Therefore, by adjusting the variable resistors VR3 to VR5, it is possible to set the pressing force of the pre-pressing, the pressing force of the main pressing, and the pressing force after the main pressing (finish pressure). In this case, by using the photocoupler and the diode array to generate one output signal as described above, the occupied space on the board can be reduced as compared with the case where a switching relay is used, and a combination of a resistor and a variable resistor can be used. By adjusting, the adjustment range can be widened.
[0072]
When the start signal S4 is not input (at “L”), that is, at the time of “welding”, the photocoupler 78 of the interface circuit 45 is turned on, and the welding pressure setting circuit 46 turns on the rotary switch. From the line selected at 79, voltage signals determined according to the resistance values of the variable resistors VR6 to VR8 and the resistor R17 are output to the electropneumatic proportional valve 24 as the pressure level setting signal S2 ', respectively, and are output by the electrode tips 1a and 1b. Set the pressure on the base metal to be welded. Therefore, at the time of welding, the welding pressure can be selected by the rotary switch 79.
[0073]
Next, the tip dressing procedure using the controller 3 will be described with reference to FIG. 15. After turning on the power of the controller 3, the operation permission lamp 58 is turned on to enter the operation preparation state. If possible, by pressing the operation preparation switch 32 (PB1), the operation preparation instruction signal S5 is output as shown in FIG. 15A, and the operation preparation signal S10 is output from the operation preparation circuit 36, and The operation preparation state is entered as shown in ()). At this time, it is confirmed whether the run-in indication lamp 64 is lit.
[0074]
Therefore, as described above, after the cutter holder 11 of the dresser main body 2 is positioned and set on the electrode tip 1b of the lower gun 1B, the start switch 18 of the dresser main body 2 is set as shown in FIG. By giving the motor command by pulling down the step, the motor unit 13 is driven as shown in FIG. 3D, and then, when the second step of the start switch 18 is continued, as shown in FIG. A dress pressure signal (pressure command) is emitted from the light emitter 5 and received by the light receiver 6 on the welding machine side, the controller 3 is activated, and the pressure solenoid valve 25 is operated as shown in FIG. Then, the upper gun 1A descends, and the dresser main body 2 is pressed between the electrode tips 1a and 1b. At this time, in response to the signal S15 from the timing generation circuit 41, the tip pressure setting circuit 43 sets the pressure (chip dress pressure) to a pressure level setting signal S2 for setting the pressure during pre-pressurization. Since the pressure is output to the proportional valve 24, the pressure is set to the pre-pressurizing pressure.
[0075]
In this case, when a problem such as alignment between the electrode tips 1a, 1b and the dresser body 2 occurs, the controller 3 stops operating by turning off the start switch 18 of the dresser body 2.
[0076]
Here, as shown in FIG. 8 (g), the pressing force of the main pressurization is set higher than the prepressurization and the pressing force of the finishing pressure is set lower than the prepressurization as shown in FIG. Sometimes it is light, when it shifts to the main pressurization on the way, it feels heavy, and furthermore, as you continue the dressing work, you can feel that the shift to the finishing pressure is responsive and sound, so after several seconds release the start switch 18 Then, the upper gun 1A is opened to complete the dressing operation.
[0077]
In the above embodiment, an example in which the present invention is applied to a chip dresser has been described. However, it is necessary to activate the control device when the device main body is used, which includes a device main body and a control device separate from the device main body. If it is a device, it can be applied to any device to obtain its operational effects,
[0078]
【The invention's effect】
As explained aboveIn a tip dresser of the present invention, which is a portable dresser main body having a drive source that rotationally drives a cutting tool for polishing an electrode tip of a welding machine and a control device separate from the dresser main body, the dresser main body side includes: A two-stage switch for instructing activation of the dresser body and the control device; a first stage of the two-stage switch driving a drive unit of the dresser body; a second stage in addition to the drive command; When the start of is instructed, a start command output means for outputting a start command by an optical signal to the control device including at least a portable light projector is provided, and the control device side, at least a light receiver, Including a Schmitt trigger inverter connected to a capacitor on the input side, a start input receiving means for receiving a start command by an optical signal from the start command output means is provided, With each other when the suppressor body is rotated deviated optical axes of the transmitter and receiver, projector from dress pressurization signal of the dresser body is no longer input to the controller of the optical receiver, immediately because dress was made to stop,The start-up operation of the device is facilitated, and the use of the optical signal makes it possible to stop the control device when the position shift of the device main body occurs.
[0079]
In addition, the tip dresser of the present inventionIs a light-emitting element for inputting a start command signal corresponding to the input start command, a light-receiving element for receiving light emitted from the light-emitting element, and an output side of the light-receiving element. EstablishmentConnected a capacitor to the input sideThe presence of the Schmitt trigger element prevents chattering of the signal output from the light receiving element, thereby preventing the control device from malfunctioning.
[Brief description of the drawings]
FIG. 1 is an overall system configuration diagram showing an embodiment of a chip dresser to which an apparatus for activating a device according to the present invention is applied.
FIG. 2 is an external perspective view of a dresser body.
FIG. 3 is a block diagram of a controller.
FIG. 4 is a circuit diagram showing details of an interlock relationship between a start input receiving circuit, a pressure valve switching circuit, and a welding timer 8 of FIG. 3;
FIG. 5 is a circuit diagram showing details of a chattering prevention circuit, an operation preparation circuit, and a malfunction prevention circuit of FIG. 3;
6 is a circuit diagram showing details of the interlock circuit shown in FIG. 3;
FIG. 7 is a circuit diagram showing details of the timing generation circuit of FIG. 3;
FIG. 8 is a circuit diagram showing details of a tip dress pressure setting circuit, a welding pressure setting circuit, and the like in FIG. 3;
FIG. 9 is an external view of a controller.
FIG. 10 is an explanatory diagram illustrating a connection relationship between controllers.
FIG. 11 is a timing chart for explaining the operation of a start input receiving circuit;
FIG. 12 is a timing chart for explaining the operation of the chattering prevention circuit;
FIG. 13 is a timing chart for explaining an operation related to operation preparation;
FIG. 14 is a timing chart for explaining the operation related to the timing generation;
FIG. 15 is an explanatory diagram for explaining a tip dressing operation;
[Explanation of symbols]
1A: Upper gun, 1B: Lower gun, 1a, 1b: Electrode chip, 2: Dresser body, 3: Controller, 4: Pressurizing drive system, 5: Projector, 6: Receiver, 8: Weld timer, 12: Polishing Chip, 13: motor, 18: start switch, 24: static proportional valve, 25: pressurized solenoid valve, 31: start input receiving circuit, 32: operation preparation switch, 33: chattering prevention circuit, 34, 35, 37 ... Gate circuit, 36: operation preparation circuit, 39: interlock circuit, 40: reset signal generation circuit, 41: timing generation circuit, 43: tip dress pressure setting circuit, 44: pressurizing valve switching circuit, 46: welding pressure setting circuit.

Claims (1)

A tip dresser comprising a control device separate from a portable dresser main body having a drive source for rotating and driving a blade tool for polishing an electrode tip of a welding machine, wherein the dresser main body and the control are provided on the dresser main body side. A two-stage switch for instructing the start of the device is provided, and the first stage of the two-stage switch drives the drive unit of the dresser body. In the second stage, in addition to the drive command, the start of the control device is instructed. At least, a start command output means for outputting a start command by an optical signal to the control device including at least the portable light projector, and at least a light receiver and a capacitor on the input side are provided on the control device side. A starter input receiving means for receiving a start command by an optical signal from the start command output means, comprising a connected Schmitt trigger inverter; Rotated with each other when shifted optical axes of the transmitter and receiver, activation of the device projector of dress pressurization signal of the dresser body is no longer input to the controller of the light receiver, immediately characterized in that dress is stopped apparatus.

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