JPH08252759A - Timing generating device - Google Patents

Abstract

PURPOSE: To provide a timing generating device capable of generating the correct timing signal using two mono-multis. CONSTITUTION: The starting signal S6 is inputted in the input terminal and the clear terminal of a mono-multi 63 for preliminary pressing to set the preliminary pressing time, and the first signal S12 which is obtained from the reverse Q output of the mono-multi 63 for preliminary pressing and the starting signal S6 are inputted in an AND circuit 67. The output signal of the AND circuit 67 is respectively inputted to the input terminal and the clear terminal of the mono-multi 64 for permanent pressing to set the permanent pressing time to obtain the second signal S14 from the reverse Q output of the mono-multi 64 for the permanent pressing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing generator, and uses a manually operated tip dresser (hand dresser) for dressing (polishing) electrode tips of a welding machine such as a stationary spot welding machine and a multi-spot welding machine. The present invention relates to a timing generation device in a controller for performing necessary control when polishing by polishing.

[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, since the above-mentioned conventional tip dresser is a stationary tip dresser, one tip dresser must be installed corresponding to one welding machine. However, this leads to an increase in the size of welding equipment and an increase in costs. Therefore, there is a demand for a portable tip dresser (hand dresser) that allows an operator to manually polish an electrode tip at a place where a welding machine is installed.

In the case of using such a hand dresser, when performing the dressing work, the dresser body is pressurized with a weak pressure until the first set time elapses from the start of the dressing, and the first set time is set. It is desirable to be able to perform control so as to pressurize the dresser main body with a strong pressurizing force until after the second set time has elapsed after the passage of.

In order to perform such control, two monostable multivibrators (hereinafter also referred to as "monomulti") are combined, and the first stage monomulti is activated by an input signal (activation signal). The output obtained when the first set time has elapsed from the first-stage mono multi is used as the first signal, the next-stage mono-multi is activated by this first signal, and the second-stage mono-multi It is conceivable to use the output obtained when the set time has passed as the second signal.

In this case, if two monomultis are to be reset when the input signal is not input,
When two mono-multis are simply combined, the input signal is input due to the transient effect of the mono-multis, that is, the delay time between the input of the input signal and the output transition. At the same time, the inconvenience occurs that both of the two mono-multis are activated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a timing generation device capable of generating an accurate timing signal by using two mono-multis.

[0009]

In order to solve the above problems, the timing generator according to the present invention outputs a first signal indicating that a first set time has elapsed from the time when the input signal was input. At the same time, in the timing generation device for outputting the second signal indicating that the second set time has elapsed from the time when the first set time has elapsed, the input signal is changed to the first set time. Input to the input terminal and the clear terminal of the first monostable multivibrator to be set, respectively, and input the first signal and the input signal obtained from the output terminal of the first monostable multivibrator to the AND circuit. The output signal of the AND circuit is the second signal
Input to the input terminal and the clear terminal of the second monostable multivibrator for setting the set time of the second monostable multivibrator, and the output terminal of the second monostable multivibrator to the second terminal.
It is configured to obtain the signal of.

According to a second aspect of the present invention, there is provided the timing generation apparatus according to the first aspect, wherein the first and second monostable multivibrators are set to variably set the first and second set times. Adjustment means were provided.

[0011]

According to the timing generator of the present invention, the input signal is input from the output terminal of the first monostable multivibrator by inputting the input signal to the input terminal and the clear terminal of the first monostable multivibrator, respectively. A first signal indicating that the first set time has elapsed from the time of being input is output, and the first signal from the first monostable multivibrator and the input signal are output to the second signal via the AND circuit. By inputting each to the input terminal and the clear terminal of the monostable multivibrator, it is shown that the second set time has elapsed after the first signal was output from the output terminal of the second monostable multivibrator. The second signal is output. At this time, by ANDing the first signal and the input signal,
The second monostable multivibrator is prevented from being activated by the transient effect of the first monostable multivibrator, and when the input signal is no longer input, 2
Two monostable multivibrators can be reset.

According to a second aspect of the present invention, there is provided the timing generation device according to the first aspect, wherein the first and second monostable multivibrators are set to variably set first and second set times. Since it is provided, the first set time and the second set time can be adjusted within a required range.

[0013]

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 exploded perspective view of a dresser main body, FIG. 3 is a block diagram of a controller, and FIG. 4 is a chattering prevention circuit, a start signal generation circuit, and an interface of FIG. FIG. 5 is a circuit diagram showing details of the lock acceptance circuit and malfunction prevention circuit, FIG. 5 is a circuit diagram showing details of the timing generation circuit of FIG. 3, and FIG. 6 is details of the tip dress pressure setting circuit, the welding pressure setting circuit of FIG. 7 is a circuit diagram showing details of the pressurizing valve switching circuit of FIG. 3 and the like, and FIG. 8 is an external view of the controller.

This hand dresser system includes electrode tips 1a and 1b of an upper gun 1A and a lower gun 1B of a welding machine.
Dresser body 2 that can be rotated manually for polishing
And the dresser body 2 is used for the electrode tips 1a and 1b.
Controller 3 that controls the manual polishing (hand dressing) of the wafer, a pressure drive system 4 that is controlled by the controller 3 to press the dresser body 2 by the electrode tips 1a and 1b during the hand dressing, and a controller. Three
And a dressing start switch 5 for outputting a dressing pressure signal S1 for instructing the start of dressing.

The pressure drive system 4 of this hand dresser system is also used as the pressure drive system of the welding machine itself. Further, the controller 3 and the welding timer 6 of the welding machine to which a welding start instruction is given from the welding start switch 7 are connected for interlocking, and a welding pressure signal from the welding timer 6 is input to the controller 3. are doing.

As shown in FIG. 2, the dresser main body 2 holds a holder receiving member 12 at the tip of a grip portion 11 so as to be swingable, attaches a holder 13 to the holder receiving member 12, and polishes the inside of the holder 13. The chip 14 is fixedly held and a cover 15 is attached.

The pressurizing drive system 4 applies air from an air source to the filter 16, the regulator 17 and the lubricator 1.
It is supplied to the electropneumatic proportional valve 20 via 8. The electro-pneumatic proportional valve 20 controls and delivers the air supplied to the air pressure according to the control voltage. And this electro-pneumatic proportional control valve 20
The air from is supplied to the cylinder 22 which drives the electrode tips 1a and 1b via the pressurizing solenoid valve 21. The pressurizing solenoid valve 21 opens and closes the air supply passage according to the control signal. Therefore, the controller 3 outputs the pressing force level setting signal S2 to the electropneumatic proportional valve 20 to control the pressing force level (dressing pressure), and outputs the pressurizing signal S3 to the solenoid valve 21 to pressurize / non-pressurize. Is controlled by switching.

As shown in FIG. 3, the controller 3 includes a chattering prevention circuit 31 and a start signal generation circuit 3.
2, a timing generation circuit 33, a hold command circuit 34 and a logic circuit 35, an interface circuit 36 and a chip dress pressure setting circuit 37, a pressurizing valve switching circuit 38, a dress /
A welding changeover switch 40, an interlock input acceptance circuit 41, a malfunction prevention circuit 42, an interface circuit 43, and a welding pressure setting circuit 44 are provided.

The chattering prevention circuit 31 outputs the output signal of the dressing start switch (PB) 5 (dressing pressure signal S1).
Are shaped to generate a dress start signal S5, and the dress start signal S5 is generated via the logic circuit 35 to the start signal generation circuit 3
Output to 2. The activation signal generation circuit 32 inputs a dress start signal S5 from the chattering prevention circuit 31 and a hold command signal S8 from a hold command circuit 34, which will be described later, via a logic circuit 35, and based on each of these input signals, an electrode chip. A start signal S6 for pressurizing the dresser main body 2 is generated by 1a and 1b, and the start signal S6 is output to the welding pressurizing setting circuit 44 via the timing generating circuit 33, the pressurizing valve switching circuit 38, and the interface circuit 43. To do.

The timing generation circuit 33 generates a timing signal S7 according to a predetermined pressurizing pattern based on the activation signal S6 from the activation signal generation circuit 32, and a chip via the hold command circuit 34 and the interface circuit 36. It is output to the dressing pressure setting circuit 37. Hold command circuit 3
4 is a timing signal S from the timing generation circuit 33.
The hold command signal S8 for holding the start signal S6 output from the start signal generation circuit 32 according to
Is output to the activation signal generation circuit 32 via.

Here, the "predetermined pressurization pattern" indicates the relationship between the dressing pressure and the time for applying the dressing pressure. In this embodiment, the pressurizing force is prepressurized, main pressed, The finishing pressure is set in three stages (see FIG. 12), the time for applying the pre-pressurizing force is the pre-pressurizing time (first set time), and the time for applying the main pressurizing force is the main pressing time As the (second set time), the timing generation circuit 33 generates timing signals for the pre-pressurization time and the main pressurization time.

The tip dressing pressure setting circuit 37 is a voltage signal for setting the pressure applied to the dresser main body 2 by the electrode chips 1a and 1b according to the timing signal S7 from the timing generation circuit 33. Is output to the electropneumatic control valve 20. The pressurizing valve switching circuit 38 uses the activation signal S from the activation signal generation circuit 32.
The pressurizing signal S3 is output to the pressurizing solenoid valve 21 in accordance with No. 6, and the dresser main body 2 by the electrode tips 1a and 1b.
Switches between pressurizing and non-pressurizing.

The dress / welding changeover switch 40 is a toggle type switch and outputs a signal according to the changeover of dress / welding. The interlock input acceptance circuit 41 cuts off the power supply to the welding timer 6 during dressing in response to an input signal from the dressing / welding changeover switch 40. The malfunction prevention circuit 42 outputs blocking signals S9 and S10 that prevent the dressing start signal S1 from the chattering prevention circuit 31 and the activation signal S6 from the activation signal generation circuit 32 from being output when the dressing power supply is turned on. Welding pressure setting circuit 4
Reference numeral 4 outputs to the electropneumatic control valve 20 a pressing force level setting signal S2 ′ which is a voltage signal for setting the welding pressing force according to the starting signal S6 from the starting signal generating circuit 32.

Next, the details of each part will be described with reference to FIG. 4 and subsequent figures. First, referring to FIG. 4, the dress starting switch 5 which is the starting switch means has an a (normally open) contact 5
Push button (P) with a and b (normally closed) contacts 5b
B) type switch. The chattering prevention circuit 31
Normally open contact 5a and normally closed contact 5b of the dress start switch 5
Pull-up resistors R1 and R for pulling up the power supply to Vcc
2, a negative edge going type JK flip-flop (hereinafter referred to as “FF”) circuit 51,
It is composed of an AND circuit 52 and a capacitor C1.

The FF circuit 51 has a J terminal, a K terminal, and a CK.
Ground the (clock) terminal, input the output signal (dress pressurizing signal) S1a of the normally open contact 5a of the dress start switch 5 to the preset (PR) terminal, and normally close the dress start switch 5 to the clear (CLR) terminal. The output signal (dress pressurizing signal) S1b of the contact 5b is input through the AND circuit 52. The AND circuit 52 is a malfunction prevention circuit 42 described later.
Is a gate circuit that allows the output signal S1b of the normally closed contact 5b of the dress starting switch 5 to pass when the blocking signal S9 that is the output of the high level H (hereinafter simply referred to as "H"). The Q output of the FF circuit 51 is used as the dress start signal S5a, and the inverted Q output is used as the dress start signal S5.
It is output to the activation signal generation circuit 32 as b.

The start signal generation circuit 32 is a negative edge going type JK FF circuit 53, a Schmitt trigger inverter 54, and NOR gate circuits 55, 5.
It consists of 6 and 6. The FF circuit 53 has a J terminal, a K terminal and a P terminal.
The R terminal is connected to the power supply Vcc, the output of the logic circuit 35, which is a NOR gate circuit, is input to the CK terminal via the Schmitt trigger inverter 54, and the blocking signal S9 from the malfunction prevention circuit 42 is input to the CLR terminal. The logic circuit 35 includes a dress start signal S5b, which is an inverted Q output of the FF circuit 51 of the chattering prevention circuit 31, and a hold command circuit 34.
The hold command signal S8 from is input.

The Q output of the FF circuit 53 and the dress start signal S5a which is the Q output of the FF circuit 51 of the chattering prevention circuit 31 are input to the NOR gate circuit 55, and the output of the NOR gate circuit 55 is input to the malfunction prevention circuit 42. The blocking signal S10 is output as the activation signal S6 via the NOR gate circuit 56 having the other input.

On the other hand, the dress / welding changeover switch 40 is a toggle type switch. The contact a side is connected to the power supply Vcc with the "dress" side, the contact b side is grounded with the "welding" side, and the common contact c is connected. It is connected to the lock acceptance circuit 41. The interlock acceptance circuit 41 is a relay (C
R) 57, a switching transistor TR1, an input resistor R3, a diode D1 and a Schmitt trigger inverter 58, and outputs a signal S11 having a level according to the state of the dress / welding changeover switch 40.

The malfunction prevention circuit 42 comprises a delay circuit 59 composed of a resistor R4 and a capacitor C2, and Schmitt trigger inverters 60 and 61. The delay circuit 59 delays the signal S11 from the interlock acceptance circuit 41 and the Schmitt trigger inverter. The blocking signal S10 obtained via 60 is applied to the NOR gate circuit 56 of the activation signal generation circuit 32.
At the same time, the blocking signal S10 is output to the AND circuit 52 of the chattering prevention circuit 31 and the FF circuit 53 of the activation signal generating circuit 32 as the blocking signal S9 obtained through the Schmitt trigger inverter 61.

Next, referring to FIG. 5, the timing generation circuit 33 includes a pre-loading mono-multi 63 which is a first monostable multi-vibrator composed of a dual retriggerable monostable multi-vibrator, and this mono-multi. A setting time adjusting means including a variable resistor VR1, a resistor R5, and a capacitor C3 for setting a pulse width of 63 (prepressurization time = first setting time), and a dual retriggerable monostable multivibrator. 2 is a monostable multivibrator for the main pressurization, and a variable resistance VR for setting the pulse width (main pressurization time = second set time) of the monomulti 64.
2. A set time adjusting means including a resistor R6 and a capacitor C4, AND circuits 65 and 66, an integrating circuit 67 including a resistor R7 and a capacitor C5, and a Schmitt trigger inverter 68.

The starting signal S6 from the starting signal generating circuit 32 is inputted to the pre-pressurizing mono-multi 63 as an input signal in the present invention, and the signal (first signal) which is the inverted Q output of the pre-pressurizing mono-multi 63 (first signal). ) S12 and the integration output S13 of the integration circuit 67 that integrates the activation signal S6 are combined into an AND circuit 6
5 and the output of the AND circuit 65 is input to the main pressurizing mono-multi 64 to invert Q of the pre-pressurizing mono-multi 63.
Output (signal) S12, inverted Q of mono press multi 64 for main pressurization
Output signal (second signal) S14 and integrating circuit 67
The integrated output S13 of is input to the AND circuit 66.

Then, the reversal Q of the mono-multi 63 for pre-pressurization
Output S12, inverted Q output S1 of mono-multi 64 for main pressurization
4 and the output S16 obtained by inverting the output S18 of the AND circuit 66 by the Schmitt trigger inverter 68, the chip dress pressure setting circuit 3 via the interface circuit 36, respectively.
7, the Q output S17 of the main pressurizing monomulti 64 and the output S18 of the AND circuit 66 are input to the hold command circuit 34.

The hold command circuit 34 is composed of a NOR gate circuit, and inputs the Q output S17 of the main pressurizing monomulti 64 and the output S18 of the AND circuit 66 as described above,
The hold command signal S8 is output to the logic circuit 35 described above.

Next, referring to FIG. 6, the interface circuit 36 includes an inverted Q output S12 of the pre-pressurizing monomulti 63 of the timing generation circuit 33, an inverted Q output S14 of the main pressurizing monomulti 64, and a Schmitt trigger inverter. Three photocouplers 71 to which the output S16 of 68 is respectively input
It consists of ~ 73. The chip dress pressure setting circuit 37 includes resistors R10 to R12 and variable resistors VR3 to V connected to the output sides of the photocouplers 71 to 73 of the interface circuit 36.
It is composed of R5, a resistor R9 and diodes D2 to D5, and outputs a voltage signal corresponding to the resistance values of the variable resistors VR3 to VR5 and the resistors R9 to R12 to the electropneumatic proportional valve 20 as a pressing force level setting signal S2.

The interface circuit 43 receives the start signal S6 from the start signal generation circuit 32 and receives the photo coupler 7 from the photo coupler 7.
It consists of 4. The welding pressure setting circuit 44 includes the photo coupler 7
4, a rotary switch 75 connected to the output side, variable resistors VR6 to VR8, a resistor R15 and a diode D5 to
D7 and variable resistors VR6 to VR8 and resistor R1
The voltage signal corresponding to the resistance value of 5 is applied to the pressure level setting signal S
2'is output to the electropneumatic proportional valve 20.

Next, referring to FIG. 7, the pressurizing valve switching circuit 38 includes a switching transistor TR.
3, a phototriac 77, a surge absorbing element 78, and resistors R13 and R14. The activation signal S6 from the activation signal generation circuit 32 is transmitted through the resistor R11 to the transistor TR.
3, the output end of the phototriac 77 is inserted in the power feeding path to the pressurizing solenoid valve 21 to switch the light emitting element side. The normally open contacts CR1 and CR2 of the relay 57 of the interlock receiving circuit 41 described above are interposed in the power supply path to the pressurizing solenoid valve 21. The normally-closed contact CR3 of the relay 57 outputs the energization to the welding timer 6 during dressing, and the normally-closed contacts CR4 and CR5 shut off the solenoid valve terminal of the welding timer 6 during dressing.

As shown in FIG. 8, the controller 3 described above includes a dress / welding changeover switch 40, a welding pressure selection rotary switch 75, and a dressing time setting variable resistance V.
R1, VR2, dressing pressure setting variable resistors VR3 to VR5
Is arranged so that it can be operated externally together with the "power-on" display lamp 80. Here, the variable resistors VR1 to VR5 are provided so that they can be externally operated while being installed on the internal PCB substrate.

Next, the operation of the hand dresser system configured as described above will be described with reference to FIG. 9 and subsequent figures. First, the operation of each unit of the controller 3 will be described. The operation of the chattering prevention circuit 31 will be described. It is assumed that the dressing / welding changeover switch 40 is set to the contact a side and is switched to the dressing state. At this time, the transistor TR1 of the interlock acceptance circuit 41 is turned on, the relay 57 is activated, and the pressurizing solenoid valve 2 is activated.
Normally open contact CR of relay 57 interposed in the power supply path to 1
1 and CR2 are in a closed state. Further, the output signal S11 of the interlock acceptance circuit 41 becomes "H",
The blocking signal S10 of the malfunction prevention circuit 42 is at a low level "L" (hereinafter simply referred to as "L"), and the blocking signal S9.
Is "H". As a result, the gate of the AND circuit 52 of the chattering prevention circuit 31 is in an open state.

Under this condition, when the dress start switch 5 is pushed down, the output signal S1a of the normally open contact 5a becomes "L".
Then, the output signal S1a is input to the PR terminal of the FF circuit 51, and the output signal S1b of the normally closed contact 5b is "H".
Then, the AND circuit 52 whose output signal S1b is in the open state
Is input to the CLR terminal of the FF circuit 51 via.

In this case, since chattering occurs at each contact of the push button type dressing start switch 5, when the dressing start switch 5 is pushed down, the normally open contact 5a of the dress start switch 5 is pushed as shown in FIG. The output signal S1a becomes stable after becoming chattering from "H" and then becomes "L" as shown in FIG. 7A, and at this time, the output signal S1b of the normally closed contact 5b 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. Also,
When the depression of the dress start switch 5 is released, the normally open contact 5a returns faster than the normally closed contact 5b as shown in the figure, and the output signal S1a chatters to a stable state. The output signal S1b causes chattering and shifts to a stable state.

Since the J terminal and the K terminal of the FF circuit 51 are both "H", the PR terminal is "L" and the CL terminal is CL.
When the R terminal becomes "H", the Q output is set to "H" and P
Q when the R terminal is "H" and the CLR terminal is "L"
Set the output to "L". Therefore, when the dress starting switch 5 is pushed down from the FF circuit 51 as shown in FIG. 7C, it becomes "H" from the time when the normally open contact 5a is closed, and when the pushing down of the dress starting switch 5 is released. , When the normally closed contact 5b is closed, a Q output that becomes “L” is obtained, and this Q output is output as the dress start signal S5a. As shown in FIG. Is output as the dress start signal S5b.

As described above, the dress start switch 5 which is a push button type switch having the a-contact and the b-contact.
By combining output signals including chattering at each contact of the dress start switch 5 using a circuit including the resistors R1 and R2 and the FF circuit 51, a dress start signal with chattering removed can be obtained. Then, by using such a push button type switch as the starting switch, it is possible to facilitate the inching operation at the time of pre-pressurization, as described later.

Next, the start-up signal generation circuit 32 is output by the clock input of the FF circuit 53 when the input signal to the Schmitt trigger inverter 54 (the output signal of the logic circuit 35) changes from "L" to "H". Is reversed, so
As shown in 0 (a) and (b), the chattering prevention circuit 31 outputs dress start signals S5a and S5b by depressing the dress start switch 5 to instruct dress start (pressurize command). Assuming that the blocking signal S10 from the malfunction prevention circuit 42 is "L", the dress start signal S5a from the chattering prevention circuit 31 becomes "H", so that the output of the NOR gate circuit 55 becomes the Q output of the FF circuit 53. Regardless, it becomes "L" and the activation signal S6 which is the output of the NOR gate circuit 56 becomes "H" as shown in FIG.

Therefore, as will be described later, from the hold command circuit 34, a first set time (pre-pressurization time) t2 predetermined from the rising of the start signal S6 as shown in FIG.
Becomes "L" when the time elapses, and after a predetermined time elapses from the time when the first set time elapses (again, the dress start switch 5
(Time until the start signal S6 becomes "L" by pushing down)
The hold command signal S8 which becomes "H" when is passed is output. Then, the output of the logic circuit 35 is maintained at "L" until the pre-pressurization time t2 elapses.
The output of the FF circuit 53 is not inverted, and the activation signal S6 is "H" every time the dressing start signal S5a from the chattering prevention circuit 31 becomes "H" as shown by the broken lines in FIGS. become.

As a result, during the period from when the dress starting switch 5 is pressed until the pre-pressurization time which is the first set time elapses, the pressing and non-pressurizing of the dress starting switch 5 is repeated. The pressure can be switched and controlled (inching operation), and the electrode tip 1
Since the dresser main body 2 can be aligned so that the dresser body 2 fits well with a and 1b, the workability of the dressing work is improved.

Then, when the pre-pressurization time t2 elapses while the dress start switch 5 is being pressed, the hold command signal S8 changes from "H" to "L", at which time it is shown in FIG. As described above, since the dress activation signal S5b is "L", the output of the logic circuit 35 changes from "L" to "H".
Then, the clock is input to the FF circuit 53, and the Q output of the FF circuit 53 becomes “H”. Therefore, even if the pressing of the dress start switch 5 is released thereafter and the dress start signal S5a of the chattering prevention circuit 31 becomes "L", the output of the NOR gate circuit 55 is held at "H" and the NOR gate The activation signal S6, which is the output of the circuit 56, also remains held at "H".

Therefore, after the pre-pressurization time t2 has passed, after the main pressurization time, even if the user depresses the dress start switch 5 to release the depression, the start signal S6 of the start signal generation circuit 32 is held. Since the pressure applied to the dresser main body 2 by the electrode tips 1a and 1b is maintained, the dressing work can be concentrated and the workability is improved.

Then, under this condition, the dress starting switch 5 is pressed down again to input the clock to the FF circuit 53, the Q output thereof becomes "L", and the starting signal S6 from the NOR gate circuit 56 becomes "L". That is, the activation signal S6 is not output.

Next, the timing generation circuit 33 operates as shown in FIG.
When the activation signal S6 from the activation signal generation circuit 32 is input (becomes "H") as shown in (a), as shown in FIG.
1, a signal S1 which becomes “L” for a predetermined time (pre-pressurization time t2) determined according to each value of the resistor R5 and the capacitor C3
2 is output, and the signal S1 of the premultiplying monomulti 63 is output.
When 2 rises to "H", as shown in FIG. 7C, a predetermined time (main pressurization time t3) determined from the main pressurizing monomulti 64 according to the values of the variable resistor VR2, the resistor R6 and the capacitor C4. Signal S, which is an inverted Q output that only becomes “L”
14 is output.

Here, since the pre-pressurization monomulti 63 and the main pressurization monomulti 64 need to be reset when the start signal is not input, each monomulti 63,
The activation signal S6 must be input to the CLR terminal 64. However, when the activation signal S6 is input to the CLR terminals of the pre-pressurizing mono-multi 63 and the main pressurizing mono-multi 64 in this way, the reverse Q of the pre-pressurizing mono-multi 63 is obtained.
When the output (signal S12) is directly input to the main pressurizing mono-multi 64, that is, when two mono-multis serving as timers are simply combined to generate a timing corresponding to a predetermined pattern, the result shown in FIG. As shown in the figure, a delay time Δt1 occurs between the time when the activation signal S6 is input due to the transient characteristics of the mono-multi and the time when the inverted Q output of the pre-press mono-multi 63 becomes “L”.
When the start signal S6 is input, the inconvenience arises in that the main pressurizing mono-multi 64 also operates as shown by the broken line in FIG.

Therefore, in the present embodiment, by providing an AND circuit 65 for ANDing the activation signal S6 and the inverted Q output (signal S12) of the pre-pressurizing monomulti 63, the activation signal S6 is in the "H" state. Thus, when the inverted Q output of the pre-pressurizing monomulti 63 changes from "L" to "H", the main pressurizing monomulti 64 starts to operate to prevent malfunction due to the transient effect. .

Further, in the timing generation circuit 33, the inverted Q output of the pre-pressurizing mono-multi 63, the inverted Q output of the main pressurizing mono-multi 64 and the output of the AND circuit 66 for inputting the start signal S6 and the main pressurizing operation. Mono Multi 64 Q
The output and the output are input to the hold command circuit 34 that generates the hold signal S8.

In this case, the activation signal S6 is ANDed as it is.
When input to the circuit 66 and the AND circuit 65, when the activation signal S6 is input from the hold command circuit 34 due to the transient effect described above, the output of the AND circuit 66 is "H" as shown by the broken line in FIG. 11 (e). Becomes (AN
The output of the D circuit 65 is also the same), and one pulse is output as the hold command signal S8 from the hold command circuit 34 as indicated by the broken line in FIG.
As described in 2, the clock signal is input to the FF circuit 53, and the activation signal S6 is held. As a result, not only the inching operation during the pre-pressurization time becomes impossible, but even if the dress starting switch 5 is pressed thereafter, the monomultis 63, 64 of the timing generation circuit 33 cannot be reset.

Therefore, the activation signal S6 is not directly input to the AND circuits 66 and 65, but the integration circuit 6
7 is provided and the output obtained by integrating the start signal S6 is AND circuit 6
6 and the AND circuit 65, the output of the integration circuit 67 (signal S13) is "H" until the inverted Q output of the monomulti 63 becomes "L" as shown in FIG. 11 (f). Therefore, it is possible to prevent the hold command signal S8 from being output during the delay time due to the transient effect.

Next, referring to FIG. 6, the chip dress pressure setting circuit 37 outputs the signal S12 from the pre-pressing mono-multi 63.
While "L" is set, the photocoupler 71 of the interface circuit 36 is turned on, and the voltage signal corresponding to the resistance value determined by the resistors R9 and R10 and the variable resistor VR3 is output. While "L", the photocoupler 72 is in the ON state, and the voltage signal corresponding to the resistance value determined by the resistors R9 and R11 and the variable resistor VR4 is supplied to the signal S16 from the Schmitt trigger inverter 68 (FIG. 11).
While the (inverted signal of (e)) is “L”, the photocoupler 73 is in the ON state and the resistors R9 and R12 and the variable resistor VR5 are
A voltage signal corresponding to the resistance value determined by is output to the electropneumatic proportional valve 20 as a pressing force level setting signal S2 to set the pressing force of the dresser body 2 by the electrode tips 1a and 1b.

Therefore, by adjusting the variable resistors VR3 to VR5, it is possible to set the pre-pressurizing force, the main pressurizing force, and the post-main pressurizing (finishing pressure) pressurizing force. 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.

The welding pressure setting circuit 44 turns on the photocoupler 74 of the interface circuit 43 when the activation signal S6 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 75.
A voltage signal determined according to the resistance value of 15 is output to the electropneumatic proportional valve 20 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 75.

Next, returning to FIG. 4, when the dress / welding changeover switch 40 is set to the dress side, the transistor TR1 of the interlock receiving circuit 41 is turned on and the output signal S11 becomes "H". , Relay 57
Is powered. This closes the contacts CR1 and CR2 of the relay 57 as shown in FIG.
Since the CR5 opens to cut off the power supply to the welding timer 6 and cut off the power supply from the solenoid valve terminal of the welding timer 6, the welding timer 6 does not operate during dressing.

Further, since the output signal S11 of the interlock acceptance circuit 41 becomes "H", the malfunction prevention circuit 42 is provided.
Since the blocking signal S10 which is the output of the above becomes "L" and the blocking signal S9 becomes "H", the starting signal generating circuit 32 can output the starting signal S6 as described above, and the starting signal generating circuit 32 outputs the starting signal S6. When the activation signal S6 is output, the pressurizing valve switching circuit 38 shown in FIG. 7 is turned on and the power supply path to the pressurizing solenoid valve 21 is closed.

By the way, at this time, the chattering prevention circuit 31 is directly connected to the output of the dressing / welding changeover switch 40.
FF circuit 51 and FF circuit 5 of the start signal generation circuit 32
When the CLR terminals of 3 are input, the C of the FF circuits 51 and 53 is turned on when the controller 3 is turned on with the dress / welding changeover switch 40 being set to the dress side.
The dress is executed for one cycle before the LR terminal becomes “H” and the dress start switch 5 is pressed.

Therefore, the malfunction prevention circuit 42 has a resistor R4.
By providing the combination of the delay circuit 59 including the capacitor C2 and the Schmitt trigger inverter, a predetermined delay time is provided when the controller 3 is turned on with the dress / welding changeover switch 40 in the dress side. A sufficient time required for outputting the blocking signal S9 which becomes “H” after the elapse and resetting the FF circuit 51 of the chattering prevention circuit 31 and the FF circuit 53 of the activation signal generation circuit 32 is the CLR terminal of each FF circuit 51, 53. The "L" input is given to prevent the malfunction.

On the other hand, when the dress / welding changeover switch 40 is set to the welding side, the transistor TR1 of the interlock acceptance circuit 41 is turned off and the output signal S11 is output.
Becomes "L", the blocking signal S9 of the malfunction prevention circuit 42 becomes "L", and the blocking signal S10 becomes "H". Therefore, even if the dress start switch 5 is pressed, the AND circuit 52 of the chattering prevention circuit 51 is closed. To start dressing signal S5
Is not output, and since one input of the NOR gate circuit 56 of the activation signal generation circuit 32 is "H", its output is "L" regardless of the other input and the activation signal S6 is output. It will not happen.

The handdressing operation procedure using the controller 3 will now be described with reference to FIG. 12 as well. After the controller 3 is turned on, the dress / welding changeover switch 40 is set to the "dress" side. As a result, as described above, the welding timer 6 becomes inoperable and the welder cannot operate.

Under this condition, when the dresser body 2 is set on the electrode tip 1b of the lower gun 1B of the welding machine and the dress start switch 5 is pressed, as shown in FIG. S1 (dress command) is input to the chattering prevention circuit 31 of the controller 3, the chattering prevention circuit 31 outputs a dress start signal S5, and the activation signal generation circuit 32 outputs an activation signal S6. As shown in FIG. 5, the pressurizing valve switching circuit 38 operates the pressurizing solenoid valve 21 to open the air supply path, so that the upper gun 1A of the welding machine descends and the dresser body 2 is sandwiched between the electrode tips 1a and 1b. And is pressurized. At this time, the pressurizing force (chip dressing pressure) is a static pressure level setting signal S2 for setting the pressurizing force at the time of pre-pressurization by the chip dressing pressure setting circuit 37 according to the signal S12 from the timing generation circuit 33. Since it is output to the proportional valve 21, it is set to a pre-pressurizing pressure.

In this case, when a problem such as alignment between the electrode tips 1a and 1b and the dresser body 2 occurs,
Since the inching operation is possible during the pre-pressurization as described above, by releasing the depression of the dress start switch 5, the upper gun 1A of the welding machine is opened and the dresser body 2 is pressed by the electrode tips 1a and 1b. Is stopped, the position can be adjusted by pressing the dressing start switch 5 again.

As shown in FIG. 12 (c), the pressing force is set so that the main pressing force is higher than the pre-pressurizing force and the finishing pressure force is lower than the pre-pressing force. When the dressing operation is performed by repeating the arm 11 of the dresser main body 2 while pressing the switch 5, it feels light at the time of initial pre-pressurization and heavy at the time of shifting to main pressurization. Therefore, when the dress starting switch 5 is released, the self-holding state is held as described above, so that the user can concentrate on the dressing work.

Further, when the dressing work is continued, the repetitive work becomes lighter when the pressure is changed to the finishing pressure. Therefore, after the dressing work is performed several times, the dressing start switch 5 is pressed.
The upper gun 1A is opened and the dressing work is completed.

In the above embodiment, an example in which the timing generator according to the present invention is applied to the controller of the handdresser has been described, but it is shown that the first set time has elapsed from the time when the input signal was input. The timing generation device according to the present invention is similarly applied to a device that requires a first signal and a second signal indicating that the second set time has elapsed from the time when the first set time has elapsed. However, the target device is not limited.

[0069]

As described above, according to the timing generator of the first aspect, the input signal is input to the input terminal and the clear terminal of the first monostable multivibrator which sets the first set time. , A second monostable for inputting a first signal and an input signal obtained from the output terminal of the first monostable multivibrator to an AND circuit and setting the output signal of the AND circuit for a second set time. Since the second signal is obtained from the output terminal of the second monostable multivibrator by inputting it to the input terminal and the clear terminal of the multivibrator, respectively, when the input signal is no longer input, the two monostable multivibrators are connected. Can be reset and produces accurate timing signals unaffected by the transient effects of the monostable multivibrator Timing generation device capable of force is obtained.

According to a second aspect of the present invention, there is provided the timing generation device according to the first aspect, wherein the first and second monostable multivibrators have variably set first and second set times. Since it is provided, the first set time and the second set time can be adjusted within a required range.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of a hand dresser body.

FIG. 3 is a block diagram of a controller

FIG. 4 is a circuit diagram showing details of a chattering prevention circuit, a start signal generation circuit, an interlock acceptance circuit, and a malfunction prevention circuit of FIG.

FIG. 5 is a circuit diagram showing details of the timing generation circuit of FIG.

6 is a circuit diagram showing details of a tip dressing pressure setting circuit, a welding pressure setting circuit, etc. of FIG. 3;

7 is a circuit diagram showing details of the pressure valve switching circuit and the like in FIG.

[Figure 8] External view of the controller

FIG. 9 is a timing chart for explaining the operation of the chattering prevention circuit.

FIG. 10 is a timing diagram used for explaining the operation of the start signal generation circuit and the holding means.

FIG. 11 is a timing diagram for explaining the operation of the timing generation circuit and the holding means.

FIG. 12 is an explanatory diagram for explaining tip dressing work.

[Explanation of symbols]

1A ... Upper gun, 1B ... Lower gun, 1a, 1b ... Electrode tip, 2 ... Dresser main body, 3 ... Controller, 4 ... Pressurization drive system, 5 ... Dress start switch, 6 ... Welding timer, 2
0 ... Static control valve, 21 ... Pressurizing solenoid valve, 31 ...
Chattering prevention circuit, 32 ... Activation signal generation circuit, 33
... Timing generation circuit, 34 ... Hold command circuit, 35
... logic circuit, 37 ... tip dress pressure setting circuit, 38 ... pressurizing valve switching circuit, 41 ... interlock acceptance circuit, 42 ... malfunction prevention circuit, 44 ... welding pressurizing setting circuit.

Claims (2)

[Claims] 1. A first signal indicating that a first set time has elapsed from when an input signal was input, and a second set time from when the first set time has elapsed In a timing generation device for outputting a second signal indicating that time has elapsed, the input signal is input to an input terminal and a clear terminal of the first monostable multivibrator that sets the first set time, respectively, The second signal for inputting the first signal and the input signal obtained from the output terminal of the first monostable multivibrator to an AND circuit and setting the output signal of the AND circuit for the second set time Timing for inputting to the input terminal and the clear terminal of the monostable multivibrator, respectively, and obtaining the second signal from the output terminal of the second monostable multivibrator Generator. 2. The timing generation device according to claim 1, wherein the first and second monostable multivibrators are provided with setting time adjusting means for variably setting the first and second setting times. A timing generation device characterized by.