JPH08252760A - Starting control device for equipment - Google Patents

Abstract

PURPOSE: To provide a starting control device to realize the starting control of the equipment with simple constitution in accordance with the preset timing pattern. CONSTITUTION: A starting control device is provided with a starting signal generating circuit 32 to generate the starting signal based on the dress starting signal, a timing generating circuit 33 to generate and output the timing signal according to the prescribed pressing pattern based on the starting signal, a hold command circuit 34 to hold the starting signal to be outputted from the starting signal generating circuit 32 according to the timing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-up control device for equipment, for example, 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 start-up control device applied to a controller for performing necessary control when polishing is performed by using.

[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.

By the way, when such a hand dresser is used, it is desirable to perform the positioning (inching operation) of the two so that the dresser main body fits well with the electrode tip when performing the dressing work. As a switch for giving a dress activation instruction, a push-button type switch that outputs a signal while it is pressed is suitable, but on the other hand, it is necessary to keep pressing the push-button type switch during dressing work. Deteriorate.

The present invention has been made in view of the above points, and an object of the present invention is to provide an activation control device capable of performing activation control of a device with a simple structure in accordance with a predetermined timing pattern.

[0007]

According to a first aspect of the present invention, there is provided a device activation control device for controlling activation of a device in accordance with a predetermined timing pattern. A start signal generating means for generating a start signal based on the start signal, a timing generating means for outputting a timing signal of the predetermined timing pattern using the start signal output from the start signal generating means as an input signal, and a timing generating circuit from the timing generating circuit. Hold means for outputting a hold command signal for causing the start signal generating means to hold the output of the start signal based on a timing signal.

According to a second aspect of the present invention, there is provided a start-up control device for equipment according to the first aspect, wherein the start-up signal from the start-up signal generating means is integrated with an integration means, and the integration output of the integration means and the timing generation. An AND circuit for taking a logical product with the timing signal of the means is provided, and the output of the AND circuit is output to the holding means.

[0009]

According to another aspect of the present invention, the activation control device generates an activation signal based on the activation instruction, generates a timing signal having a predetermined timing pattern by using the activation signal as an input signal, and holds the hold command signal based on the timing signal. Since the activation signal is held by, the activation control device that controls the activation of the device according to a predetermined timing pattern can be obtained with a simple configuration.

According to a second aspect of the present invention, there is provided the activation control device according to the first aspect.
In the startup control device of, the logical product of the integrated output of the startup signal and the timing signal is taken, and the result is used to generate the hold command signal.Therefore, the malfunction when the monostable multivibrator is used as the timing generation means Can be prevented.

[0011]

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 which is a starting switch means 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 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, timing generation circuit 33, hold command circuit 34 and logic circuit 35, interface circuit 36, chip dress pressure setting circuit 37, pressurizing valve switching circuit 3
8, a dress / 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. In the present embodiment, in addition to the dress activation switch 5, the chattering prevention circuit 31, the activation signal generation circuit 32, the timing generation circuit 33, the hold command circuit 34 of the controller 3 are provided.
And the logic circuit 35 constitutes an activation control device.

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 has a timing signal S corresponding to a predetermined pressure pattern (timing pattern) based on the activation signal S6 from the activation signal generation circuit 32.
7 is generated and output to the chip dress pressure setting circuit 37 via the hold command circuit 34 and the interface circuit 36. The hold command circuit 34 includes the timing generation circuit 33.
Starting signal generation circuit 3 according to the timing signal S7 from
The hold command signal S8 for holding the start signal S6 output from the control signal generator 2 is supplied to the start signal generation circuit 32 via the logic circuit 35.
Output to.

Here, the "predetermined pressurizing 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 timing generation circuit 33 sets the finishing pressure in three stages (see FIG. 12), the time for applying the pre-pressurizing force is the pre-pressurizing time, and the time for applying the main pressurizing force is the main pressurizing time. The timing signals for the pre-pressurization time and the main pressurization time are generated by.

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 in response 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, 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 starting signal generating 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 including a dual retriggerable monostable multi-vibrator.
And the pulse width of this mono-multi 63 (pre-pressurization time = first
Variable resistor VR1 and resistor R for setting (setting time)
5. Main pressurization monomulti 64 consisting of capacitor C3, dual retriggerable monostable multivibrator, and variable resistance for setting the pulse width (main pressurization time = second set time) of this monomulti 64 VR
2, resistor R6, capacitor C4, and AND circuits 65, 6
6, an integrating circuit 6 including a resistor R7 and a capacitor C5
7 and a Schmitt trigger inverter 68.

The starting signal S6 from the starting signal generating circuit 32 is input to the pre-pressurizing mono-multi 63, and the integrating circuit 67 which integrates the signal S12 which is the inverted Q output of the pre-pressing mono-multi 63 and the starting signal S6. The integrated output S13 of
It is input to the D circuit 65 and the output of the AND circuit 65 is input to the main pressurizing monomulti 64.
Inverted Q output (signal) S12, mono press 64 for main pressurization
The inverted Q output (signal) S14 and the integration output S13 of the integration circuit 67 are 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 activation signal S6 from the activation signal generation circuit 32 and inputs it to the photocoupler 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 starting 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, the hold command circuit 34 becomes "L" when a predetermined time (pre-pressurization time) t2 has elapsed from the rising of the start signal S6 as shown in FIG. Then, after a predetermined time (time until the start signal S6 becomes "L" by pressing the dress start switch 5 again), the hold command signal S8 that becomes "H" is output. Then, until the pre-pressurization time t2 elapses, the output of the logic circuit 35 is maintained at "L", so that the output of the FF circuit 53 is not inverted, and the outputs shown in FIGS. As shown by the broken line, every time the dress start signal S5a from the chattering prevention circuit 31 becomes "H", the activation signal S6 becomes "H".

As a result, from the time when the dress start switch 5 is pressed until the pre-pressurization time, which is the first set time, elapses, the press start / release of the dress start switch 5 is repeated and the pressurization / non-pressurization 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.

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 this time, as 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 elapses, until the second pressurization time, which is the second set time, elapses, even if the user depresses the dress start switch 5 to release the depression, the start-up is started. Since the activation signal S6 of the signal generating circuit 32 is held and the pressurization of the dresser body 2 by the electrode tips 1a and 1b is held, the dressing work can be concentrated and the workability is improved.

Then, under this condition, by depressing the dress start switch 5 again, a clock is input to the FF circuit 53, its Q output becomes "L", and the start 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, the pre-pressurizing mono-multi 63 and the main pressurizing mono-multi 64 need to be reset when the start signal is not input.
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 the AND circuit 65 which performs the AND of the starting signal S6 and the inverted Q output (signal S12) of the pre-pressurizing monomulti 63, the starting 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. .

In the timing generating circuit 33, the inverted Q output of the pre-pressurizing monomulti 63, the inverted Q output of the main pressurizing monomulti 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 resistances VR3 to VR5, it is possible to set the pressurizing force of the pre-pressurization, the pressurizing force of the main pressurizing, and the pressurizing force after the main pressurizing (finishing pressure). In this case, by using the photocoupler and the diode array to generate one output signal as described above, the space occupied on the board is smaller than that when a switching relay is used, and a resistor and a variable resistor are combined. A wide adjustment range can be obtained by adjusting them.

In the welding pressure setting circuit 44, the photo coupler 74 of the interface circuit 43 is turned on 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 acceptance 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 to 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
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.

At this time, the output of the dressing / welding changeover switch 40 is directly connected to the chattering prevention circuit 31.
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 two Schmitt trigger inverters, a predetermined delay time is provided when the power of the controller 3 is turned on with the dress / welding changeover switch 40 on 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.

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

Under this condition, the dresser main 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-pressing force and the finishing pressure force is lower than the pre-pressing force. When the arm 11 of the dresser main body 2 is repeated while the switch 5 is being pressed to perform the dressing operation, it feels light during the initial pre-pressurization and heavy during the transition to the 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 pushed,
The upper gun 1A is opened and the dressing work is completed.

In the above embodiment, the activation control device according to the present invention is applied to the controller of the handdresser, but the target equipment is not limited.

[0067]

As described above, according to the activation control device of the first aspect, the activation signal is generated based on the activation instruction, and the activation signal is used as the input signal to generate the timing signal of the predetermined timing pattern. Since the activation signal is held by the hold command signal based on this timing signal, the activation control device for controlling the activation of the device according to a predetermined timing pattern can be obtained with a simple configuration.

According to the activation control device of the second aspect, in the activation control device of the first aspect, the logical product of the integrated output obtained by integrating the activation signal and the timing signal is obtained, and the result is used to generate the hold command signal. Since it is used, it is possible to prevent malfunctions when a monostable multivibrator is used as the timing generation means.

[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 start control device for starting and controlling a device according to a predetermined timing pattern, the start signal generating means generating a start signal based on a start instruction, and the start signal generating means. Timing generation means for outputting a timing signal of the predetermined timing pattern using a start signal as an input signal, and a hold command signal for causing the start signal generation means to hold the output of the start signal based on the timing signal from the timing generation circuit. And a holding means for outputting the device. 2. The start-up control device for equipment according to claim 1, wherein an integration means for integrating the start-up signal from the start-up signal generation means, an integrated output of the integration means and a timing signal of the timing generation means are provided. An AND control circuit for taking a logical product is provided, and the output of the AND circuit is output to the holding means.