JP3666929B2 - Start signal generator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a start signal generating apparatus, and is necessary when polishing using a manually operated tip dresser (hand dresser) for dressing (polishing) an electrode tip of a welding machine such as a stationary spot welder or a multi-spot welder. The present invention relates to an activation signal generation device in a controller for performing various controls.
[0002]
[Prior art]
In spot welders such as stationary spot welders, multi-spot welders, etc., when the shape of the electrode tip wears out due to repeated pressurization, welding quality cannot be ensured. A tip dresser for polishing the electrode tip is used.
[0003]
As a conventional chip dresser, for example, as disclosed in Japanese Patent Laid-Open No. 1-181985, a moving body is supported by a frame fixed on a base so as to be movable up and down, and the dresser body is fixed to the moving body. A stationary blade in which a cutter blade rotated by an air motor is attached to the dresser body, and the electrode tip is polished by rotating the cutter blade with an air motor while pressing the electrode tip from above and below the cutter blade. A type chip dresser is known.
[0004]
[Problems to be solved by the invention]
However, since the conventional tip dresser described above is a stationary tip dresser, one tip dresser must be installed corresponding to one welding machine, which increases the size and cost of the welding equipment. Has been rising. Therefore, there is a demand for a portable tip dresser (hand dresser) that allows the operator to polish the electrode tip by manual operation at the place where the welding machine is installed.
[0005]
By the way, when such a hand dresser is used, when performing dressing, pressurization / non-pressurization (release) by the electrode tip is repeated until the electrode tip and the dresser body are aligned, It is desirable that the pressure state by the electrode tip can be maintained after the alignment between the electrode tip and the dresser body is completed.
[0006]
The present invention has been made in view of the above points, and it is an object of the present invention to provide an activation signal generation device that improves workability when a required operation is performed using a device to which an activation instruction is given manually. And
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in claim 1, a holder receiving member is swingably held at the tip of the grip portion, a holder is attached to the holder receiving member, and a polishing chip is fixedly held in the holder. In the start signal generating device used for the type chip dresser, the start signal generating device includes start switch means for instructing start of start, and a pre-pressurization time determined in advance from the start of start instruction from the start switch means. By repeatedly depressing the start switch and releasing the depressing until it passes, For pressurizing the dresser body with an electrode tip during manual polishing Can switch between pressurization / non-pressurization of the pressure drive system, After the pre-pressurization time has passed with the start switch depressed The pressurization of the manually operated tip dresser is maintained even when the start switch is released.
[0010]
[Action]
The start signal generating device according to claim 1 is a start signal according to the start start instruction of the start switch means until a predetermined pre-pressurization time elapses when the start start is instructed from the start switch means. After a predetermined pre-pressurization time has elapsed, a start signal is generated and output until a start start instruction for the start switch means is issued again regardless of the start start instruction for the start switch means. Until the predetermined pre-pressurization time elapses, by repeatedly depressing the release switch and releasing the depression, For pressurizing the dresser body with an electrode tip during manual polishing The pressure drive system can be controlled to switch between pressurization and non-pressurization, After the pre-pressurization time has passed with the start switch depressed Since a start signal can be obtained without operating the start switch means, workability is improved.
[0013]
【Example】
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 body, FIG. 3 is a block diagram of a controller, and FIG. 4 is a chattering prevention circuit, a start signal generation circuit, an interface of FIG. FIG. 5 is a circuit diagram showing details of the timing generation circuit of FIG. 3, and FIG. 6 is details of the chip dress pressure setting circuit, welding pressure setting circuit, etc. of FIG. FIG. 7 is a circuit diagram showing details of the pressurizing valve switching circuit of FIG. 3, and FIG. 8 is an external view of the controller.
[0014]
This hand dresser system includes a dresser body 2 that can be manually rotated for polishing electrode tips 1a and 1b of an upper gun 1A and a lower gun 1B of a welding machine, and electrode tips 1a and 1b using the dresser body 2. , A controller 3 for controlling the manual polishing (hand dressing), a pressure driving system 4 for controlling the dresser body 2 by the electrode chips 1a and 1b and controlling the controller 3 during the hand dressing, and the controller 3 includes a dress start switch 5 that is a start switch means for outputting a dress pressurizing signal S1 instructing dress start.
[0015]
Further, the pressure drive system 4 of this hand dresser system is shared with the pressure drive system of the welding machine itself. Further, the controller 3 and a welding timer 6 of a welding machine to which a welding start instruction is given from the welding start switch 7 are connected for interlocking, and a welding pressurization signal from the welding timer 6 is input to the controller 3. doing.
[0016]
As shown in FIG. 2, the dresser body 2 holds a holder receiving member 12 at the tip of the grip portion 11 so as to be swingable. A holder 13 is attached to the holder receiving member 12, and a polishing tip 14 is placed in the holder 13. The cover 15 is fixed and held.
[0017]
The pressurization drive system 4 supplies air from the air source to the electropneumatic proportional valve 20 via the filter 16, the regulator 17, and the lubricator 18. The electropneumatic proportional valve 20 controls and sends out the air supplied to the air pressure corresponding to the control voltage. The air from the electro-pneumatic proportional control valve 20 is supplied to the cylinder 22 that drives the electrode tips 1a and 1b via the pressurizing solenoid valve 21. The pressurizing solenoid valve 21 opens and closes the air supply path according to the control signal. Therefore, the controller 3 outputs a pressure level setting signal S2 to the electropneumatic proportional valve 20 to control the pressure level (dress pressure), and outputs a pressure signal S3 to the solenoid valve 21 to increase / decrease pressure. Is controlled to be switched.
[0018]
As shown in FIG. 3, the controller 3 includes a chattering prevention circuit 31, a start signal generation circuit 32, 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, pressurization A valve switching circuit 38, a dress / weld changeover switch 40, an interlock input reception circuit 41, a malfunction prevention circuit 42, an interface circuit 43, and a welding pressure setting circuit 44 are provided. 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, and the logic circuit 35 of the controller 3 constitute an activation signal generation unit. These constitute the activation signal generating apparatus according to the present invention.
[0019]
The chattering prevention circuit 31 shapes the output signal (dress pressurization signal S1) of the dress start switch (PB) 5 to generate a dress start signal S5, and generates the start signal via the logic circuit 35. Output to the circuit 32. The start 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 these input signals, the electrode chip An activation signal S6 for pressurizing the dresser body 2 is generated by 1a and 1b, and this activation signal S6 is output to the welding pressure setting circuit 44 via the timing generation circuit 33, the pressure valve switching circuit 38, and the interface circuit 43. To do.
[0020]
The timing generation circuit 33 generates a timing signal S7 corresponding to a predetermined pressurization pattern based on the activation signal S6 from the activation signal generation circuit 32, and sets the chip dress pressure via the hold command circuit 34 and the interface circuit 36. Output to the circuit 37. The hold command circuit 34 outputs a hold command signal S8 for holding the activation signal S6 output from the activation signal generation circuit 32 in response to the timing signal S7 from the timing generation circuit 33 to the activation signal generation circuit 32 via the logic circuit 35. To do.
[0021]
Here, the “predetermined pressurization pattern” indicates the relationship between the dress pressure and the time during which the dress pressure is applied. In this embodiment, the pressurization pressure is pre-pressurization, main pressurization, and finish pressure. The timing generation circuit is set to three stages (see FIG. 12), the time for applying the pre-pressurizing pressure is set as the pre-pressurizing time (set time), and the time for applying the pressurizing pressure is set as the main pressurizing time. 33 generates a timing signal of the pre-pressurization time and the main pressurization time.
[0022]
The chip dress pressure setting circuit 37 receives the pressure level setting signal S2, which is a voltage signal for setting the pressure of the dresser body 2 by the electrode tips 1a and 1b in response to the timing signal S7 from the timing generation circuit 33. Output to the empty control valve 20. The pressurization valve switching circuit 38 outputs a pressurization signal S3 to the pressurization solenoid valve 21 in response to the start signal S6 from the start signal generation circuit 32, and pressurizes / non-presses the dresser body 2 by the electrode tips 1a and 1b. Change the pressure.
[0023]
The dress / weld changeover switch 40 is a toggle switch, and outputs a signal corresponding to the dress / weld changeover. The interlock input receiving circuit 41 cuts off the energization to the welding timer 6 at the time of dressing according to the input signal from the dress / weld changeover switch 40. The malfunction prevention circuit 42 outputs blocking signals S9 and S10 that block the output of the dress start signal S1 from the chattering prevention circuit 31 and the start signal S6 from the start signal generation circuit 32 when the dress power is turned on. The welding pressurization setting circuit 44 supplies the electropneumatic control valve 20 with a pressurizing level setting signal S2 ′, which is a voltage signal for setting the pressurizing force during welding in accordance with the start signal S6 from the start signal generating circuit 32. Output.
[0024]
Next, details of each part will be described with reference to FIG. First, referring to FIG. 4, dress starting switch 5 as a starting switch means is a push button (PB) type switch having a (normally open) contact 5a and b (normally closed) contact 5b. The chattering prevention circuit 31 includes pull-up resistors R1 and R2 for pulling up the normally open contact 5a and the normally closed contact 5b of the dress starting switch 5 to the power source Vcc, and a negative edge going JK type flip-flop (hereinafter referred to as “K” flip-flop). It is referred to as “FF”.) The circuit 51, the AND circuit 52, and the capacitor C1.
[0025]
The FF circuit 51 grounds the J terminal, K terminal, and CK (clock) terminal, and inputs the output signal (dress pressurization signal) S1a of the normally open contact 5a of the dress starting switch 5 to the preset (PR) terminal and clears it. The output signal (dress pressurization signal) S1b of the normally closed contact 5b of the dress starting switch 5 is inputted to the (CLR) terminal via the AND circuit 52. The AND circuit 52 outputs an output signal S1b of the normally closed contact 5b of the dress starting switch 5 when a blocking signal S9, which is an output of a malfunction prevention circuit 42 to be described later, is at a high level H (hereinafter simply represented by “H”). It is a gate circuit that passes through. The Q output of the FF circuit 51 is output to the activation signal generation circuit 32 as the dress start signal S5a and the inverted Q output as the dress start signal S5b.
[0026]
The start signal generation circuit 32 includes a negative edge going JK type FF circuit 53, a Schmitt trigger inverter 54, and NOR gate circuits 55 and 56. The FF circuit 53 connects the J terminal, the K terminal, and the PR terminal to the power supply Vcc, inputs the output of the logic circuit 35, which is a NOR gate circuit, to the CK terminal via the Schmitt trigger inverter 54, and the malfunction prevention circuit 42 to the CLR terminal. The blocking signal S9 from is input. The logic circuit 35 receives 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 signal S8 from the hold command circuit 34.
[0027]
Then, 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 used as a blocking signal of the malfunction prevention circuit 42. The activation signal S6 is output through the NOR gate circuit 56 having S10 as the other input.
[0028]
On the other hand, the dress / weld changeover switch 40 is a toggle type switch, which is connected to the power source Vcc with the contact a side as the “dress” side, grounded with the contact b side as the “welding” side, and the common contact c as an interlock receiving circuit. 41 is connected. The interlock receiving circuit 41 includes a relay (CR) 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 corresponding to the state of the dress / weld changeover switch 40. .
[0029]
The malfunction prevention circuit 42 includes a delay circuit 59 including 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 reception circuit 41, and the Schmitt trigger inverter 60 passes through the delay circuit 59. The blocking signal S10 obtained in this way is output to the NOR gate circuit 56 of the starting signal generation circuit 32, and the blocking signal S9 obtained via the Schmitt trigger inverter 61 is converted into the blocking signal S10 and the AND circuit 52 of the chattering preventing circuit 31 and the starting signal. The data is output to the FF circuit 53 of the generation circuit 32.
[0030]
Next, referring to FIG. 5, the timing generation circuit 33 includes a pre-pressurization mono-multi 63 composed of a dual retriggerable monostable multivibrator, and a pulse width of the mono-multi 63 (pre-pressurization time = set time). ) Variable resistor VR1, resistor R5, capacitor C3, and a mono-multi 64 for pressurization comprising a dual retriggerable monostable multivibrator, and a pulse width (main pressurization time) of the mono-multi 64 A variable resistor VR2, a resistor R6, 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 are included.
[0031]
The pre-pressurization mono-multi 63 receives the start-up signal S6 from the start-up signal generation circuit 32, and integrates the signal S12, which is the inverted Q output of the pre-pressurization mono-multi 63, and the start-up signal S6. S13 is input to the AND circuit 65, and the output of the AND circuit 65 is input to the main pressurization mono-multi 64. The inverted Q output (signal) S12 of the pre-pressurization mono-multi 63 and the main pressurization mono-multi 64 are inverted. The Q output (signal) S14 and the integration output S13 of the integration circuit 67 are input to the AND circuit 66.
[0032]
Then, the inverted Q output S12 of the prepressurization mono-multi 63, the inverted Q output S14 of the pressurization mono-multi 64, and the output S16 obtained by inverting the output S18 of the AND circuit 66 by the Schmitt trigger inverter 68 are respectively connected via the interface circuit 36. Are output to the chip dress pressure setting circuit 37, and the Q output S 17 of the pressurizing mono-multi 64 and the output S 18 of the AND circuit 66 are input to the hold command circuit 34.
[0033]
The hold command circuit 34 is composed of a NOR gate circuit. As described above, the Q output S17 of the pressurization mono-multi 64 and the output S18 of the AND circuit 66 are input and output to the logic circuit 35 as the hold command signal S8. To do.
[0034]
Next, referring to FIG. 6, the interface circuit 36 includes an inverted Q output S12 of the pre-pressurization monomulti 63 of the timing generation circuit 33, an inverted Q output S14 of the main pressurization monomulti 64, and an output of the Schmitt trigger inverter 68. It consists of three photocouplers 71 to 73 that respectively input S16. The chip dress pressure setting circuit 37 includes resistors R10 to R12 and variable resistors VR3 to VR5 connected to the output side of the respective photocouplers 71 to 73 of the interface circuit 36, a resistor R9 and diodes D2 to D5, and the variable resistor VR3. To VR5 and the resistance values of the resistors R9 to R12 are output to the electropneumatic proportional valve 20 as the pressure level setting signal S2.
[0035]
The interface circuit 43 includes a photocoupler 74 that receives the activation signal S6 from the activation signal generation circuit 32. The welding pressure setting circuit 44 includes a rotary switch 75 connected to the output side of the photocoupler 74, variable resistors VR6 to VR8, a resistor R15, and diodes D5 to D7, and the resistances of the variable resistors VR6 to VR8 and the resistor R15. A voltage signal corresponding to the value is output to the electropneumatic proportional valve 20 as a pressure level setting signal S2 ′.
[0036]
Next, referring to FIG. 7, the pressurizing valve switching circuit 38 includes a switching transistor TR3, a phototriac 77, a surge absorbing element 78, and resistors R13 and R14, and receives the activation signal S6 from the activation signal generation circuit 32. The signal is input to the transistor TR3 via the resistor R11, and the output end of the phototriac 77 is interposed in the power supply path to the pressurizing solenoid valve 21 to switch the light emitting element side. Further, the power supply path to the pressurizing solenoid valve 21 is provided with the normally open contacts CR1 and CR2 of the relay 57 of the interlock receiving circuit 41 described above. In addition, the energization cut-off to the welding timer 6 is output at the time of dressing by the normally closed contact CR3 of the relay 57, and the solenoid valve terminal of the welding timer 6 is shut off at the time of dressing by the normally closed contacts CR4 and CR5.
[0037]
As shown in FIG. 8, the controller 3 described above includes a dress / weld changeover switch 40, a welding pressure selection rotary switch 75, dressing time setting variable resistors VR <b> 1 and VR <b> 2, and dressing pressure setting variable resistors VR <b> 3 to VR <b> 5. Together with the “power on” indicator lamp 80, it is arranged to be externally operable. Here, the variable resistors VR1 to VR5 are provided so as to be externally operable while being installed on the internal PCB substrate.
[0038]
Next, the operation of the hand dresser system configured as described above will be described with reference to FIG. First, the operation of each part of the controller 3 will be described. The operation of the chattering prevention circuit 31 will be described. It is assumed that the dress / weld changeover switch 40 is switched to the dressing state with the contact a side. At this time, the transistor TR1 of the interlock receiving circuit 41 is turned on, the relay 57 is activated, and the normally open contacts CR1 and CR2 of the relay 57 interposed in the power supply path to the pressurizing solenoid valve 21 are closed. It has become. Further, the output signal S11 of the interlock receiving circuit 41 becomes “H”, the blocking signal S10 of the malfunction prevention circuit 42 is low level “L” (hereinafter simply referred to as “L”), and the blocking signal S9 is “H”. "It has become. As a result, the AND circuit 52 of the chattering prevention circuit 31 is in a state where the gate is opened.
[0039]
In this state, when the dress starting switch 5 is depressed, the output signal S1a of the normally open contact 5a becomes “L”, and this output signal S1a is input to the PR terminal of the FF circuit 51, and the normally closed contact 5b The output signal S1b becomes “H”, and this output signal S1b is input to the CLR terminal of the FF circuit 51 via the open AND circuit 52.
[0040]
In this case, since chattering occurs at each contact of the push button type dress starting switch 5, when the dress starting switch 5 is depressed, the output signal S1a of the normally open contact 5a of the dress starting switch 5 is shown in FIG. As shown in FIG. 6A, after chattering from “H”, it becomes “L” and becomes stable. At this time, the output signal S1b of the normally closed contact 5b is normally open as shown in FIG. The chattering starts from “L” earlier than the operation of the contact a by a predetermined time, and then becomes “H” and is stable. Further, when the depression of the dress starting switch 5 is released, as shown in the figure, the return of the normally open contact 5a is earlier than the return of the normally closed contact 5b, and the output signal S1a is chattered and shifts to a stable state. The output signal S1b chatters with a delay and shifts to a stable state.
[0041]
Here, since both the J terminal and the K terminal of the FF circuit 51 are “H”, when the PR terminal is “L” and the CLR terminal is “H”, the Q output is set to “H”, and the PR terminal When Q is “H” and the CLR terminal is “L”, the Q output is set to “L”. Therefore, when the dress starting switch 5 is pushed down from the FF circuit 51 as shown in FIG. 5C, it becomes “H” when the normally open contact 5a is closed, and when 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 a dress start signal S5a. As shown in FIG. Is output as the dress start signal S5b.
[0042]
As described above, the dress start switch 5 that is a push button type switch having the a contact and the b contact, and the output including the chattering of each contact of the dress start switch 5 using the circuit including the resistors R1, R2 and the FF circuit 51. By combining the signals, a dress start signal from which chattering has been removed can be obtained. And by using such a push button type switch as an activation switch, the inching operation at the time of pre-pressurization can be facilitated as will be described later.
[0043]
Next, when the input signal to the Schmitt trigger inverter 54 (the output signal of the logic circuit 35) changes from “L” to “H”, the activation signal generation circuit 32 inverts the output by the clock input of the FF circuit 53. Therefore, as shown in FIGS. 10A and 10B, when the dress start switch 5 is depressed to instruct the dress start (pressurization instruction), the chattering prevention circuit 31 outputs the dress start signals S5a and S5b. The If 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.
[0044]
Therefore, as will be described later, the hold command circuit 34 becomes “L” when a predetermined time (pre-pressurization time) t2 elapses from the rising edge of the start signal S6 as shown in FIG. A hold command signal S8 that becomes “H” is output when time has elapsed (the time from when the dress activation switch 5 is depressed again until the activation signal S6 becomes “L”). 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 FIGS. As indicated by the broken line, the activation signal S6 becomes “H” every time the dress start signal S5a from the chattering prevention circuit 31 becomes “H”.
[0045]
As a result, during the period from when the dress activation switch 5 is pressed until the pre-pressurization time that is the set time elapses, the dress activation switch 5 is repeatedly depressed and released so as to switch between pressurization / non-pressurization. (The inching operation) can be performed, and the dresser body 2 can be aligned so that the electrode tips 1a and 1b fit well, so that the workability of the dressing operation is improved.
[0046]
When the pre-pressurization time t2 elapses with the dress activation switch 5 kept pressed, the hold command signal S8 changes from “H” to “L”, and at this time, as shown in FIG. Since the activation signal S5b is “L”, the output of the logic circuit 35 changes from “L” to “H”, the clock is input to the FF circuit 53, and the Q output of the FF circuit 53 becomes “H”. . Therefore, even if the dress activation switch 5 is subsequently released and the dress activation 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, is also held at “H”.
[0047]
Therefore, even after the pre-pressurization time t2 has elapsed and after the main pressurization time, the activation signal S6 of the activation signal generation circuit 32 is held and the electrode chip 1a is held even if the release is released by releasing the hand from the dress activation switch 5. , 1b, the pressure of the dresser body 2 is maintained, so that it is possible to concentrate on dressing work and workability is improved.
[0048]
Thereafter, by depressing the dress start switch 5 again in this state, the clock is input to the FF circuit 53, the Q output thereof becomes “L”, and the start signal S6 from the NOR gate circuit 56 becomes “L”. That is, the start signal S6 is not output.
[0049]
Next, when the activation signal S6 from the activation signal generation circuit 32 is input to the timing generation circuit 33 ("H") as shown in FIG. 11A, as shown in FIG. The pre-pressurization mono-multi 63 outputs a signal S12 that becomes “L” for a set time (pre-pressurization time t2) determined according to the values of the variable resistors VR1, R5, and capacitor C3. When the signal S12 of 63 rises to “H”, as shown in FIG. 5C, a predetermined time (main pressurization) determined from the main press mono-multi 64 according to each value of the variable resistor VR2, the resistor R6 and the capacitor C4. A signal S14, which is an inverted Q output that becomes "L" only at time t3), is output.
[0050]
Here, since the pre-pressurization mono-multi 63 and the main-pressurization mono-multi 64 need to be reset when the activation signal is not input, the activation signal S6 is input to the CLR terminal of each mono-multi 63, 64. There must be.
However, when the start signal S6 is thus input to the CLR terminals of the pre-pressurization mono-multi 63 and the main-pressurization mono-multi 64, the inverted Q output (signal S12) of the pre-pressurization mono-multi 63 is directly used for the main pressurization. When the mono-multi 64 is input, that is, when two mono-multi serving as a timer are simply combined to generate a timing according to a predetermined pattern, as shown in FIG. Since a delay time Δt1 occurs between when the start signal S6 is input and when the inverted Q output of the pre-pressurization mono-multi 63 becomes “L”, when the start signal S6 is input, FIG. As indicated by the broken line in (c), there arises a disadvantage that the pressurizing mono-multi 64 also operates.
[0051]
Therefore, in this embodiment, by providing an AND circuit 65 that ANDs the activation signal S6 and the inverted Q output (signal S12) of the pre-pressurization mono-multi 63, the activation signal S6 is preliminarily added in the “H” state. When the inverted Q output of the pressure mono-multi 63 changes from “L” to “H”, the press-use mono multi-64 starts to operate to prevent malfunction due to the transient effect.
[0052]
Further, in this timing generation circuit 33, the inverted Q output of the prepressurization monomulti 63, the inverted Q output of the main pressurization monomulti 64, and the output of the AND circuit 66 for inputting the start signal S6 and the main pressurization mono multi 64 The Q output is input to a hold command circuit 34 that generates a hold signal S8.
[0053]
In this case, when the activation signal S6 is directly input to the AND 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, as shown by a broken line in FIG. The output of the AND circuit 66 becomes “H” (the output of the AND circuit 65 is the same), and one pulse is output from the hold command circuit 34 as the hold command signal S8 as shown by the broken line in FIG. As described in the start signal generation circuit 32, the start signal S6 becomes a hold state as a clock input to the FF circuit 53. As a result, the inching operation during the pre-pressurization time becomes impossible, and the mono-multi 63 and 64 of the timing generation circuit 33 cannot be reset even if the dress start switch 5 is pressed thereafter.
[0054]
Therefore, the integration signal 67 is not input to the AND circuit 66 and the AND circuit 65 as it is, but an integration circuit 67 is provided and an output obtained by integrating the activation signal S6 is input to the AND circuit 66 and the AND circuit 65, thereby integrating the integration circuit 67. Since the output (signal S13) does not become “H” until the inverted Q output of the monomulti 63 becomes “L” as shown in FIG. 11 (f), a hold command is issued during the delay time due to the transient effect. It is possible to prevent the signal S8 from being output.
[0055]
Next, referring to FIG. 6, in the chip dress pressure setting circuit 37, while the signal S12 from the pre-pressurization mono-multi 63 is "L", the photocoupler 71 of the interface circuit 36 is turned on and the resistors R9, R9, The voltage signal corresponding to the resistance value determined by R10 and the variable resistor VR3 is output while the photocoupler 72 is turned on while the signal S14 from the pressurizing mono-multi 64 is "L", and the resistors R9 and R11 and the variable resistor VR4 are turned on. When the signal S16 from the Schmitt trigger inverter 68 (inverted signal of FIG. 11 (e)) is “L”, the photocoupler 73 is turned on and the resistors R9, R12, A voltage signal corresponding to the resistance value determined by the variable resistor VR5 is output to the electro-pneumatic proportional valve 20 as a pressure level setting signal S2, respectively, and the dressing by the electrode tips 1a and 1b is performed. Setting the pressure of the main body 2.
[0056]
Therefore, by adjusting the variable resistances VR3 to VR5, it is possible to set the pre-pressurizing pressure, the main pressing force, and the pressing force after the main pressing (finishing pressure). In this case, as described above, a single output signal is generated using a photocoupler and a diode array, so that less space is required on the board than when a switching relay is used, and a resistor and a variable resistor are combined. By adjusting, the adjustment range can be widened.
[0057]
Further, the welding pressure setting circuit 44 turns on the rotary switch when the photocoupler 74 of the interface circuit 43 is turned on when the start signal S6 is not inputted (when “L”), that is, when “welding”. The voltage signals determined according to the resistance values of the variable resistors VR6 to VR8 and the resistor R15 from the line selected at 75 are output to the electropneumatic proportional valve 20 as the pressure level setting signal S2 ′, respectively, by the electrode tips 1a and 1b. Set the pressure applied to the base material to be welded. Therefore, the welding pressure can be selected by the rotary switch 75 during welding.
[0058]
Next, referring back to FIG. 4, when the dress / weld changeover switch 40 is set to the dress side, the transistor TR1 of the interlock receiving circuit 41 is turned on, the output signal S11 becomes “H”, and the relay 57 Is supplied with power. As a result, the contacts CR1 and CR2 of the relay 57 are closed as shown in FIG. 7, and the contacts CR3 to CR5 are opened to cut off the energization to the welding timer 6 and cut off the power supply from the solenoid valve terminal of the welding timer 6. Therefore, the welding timer 6 does not operate during dressing.
[0059]
Further, since the output signal S11 of the interlock receiving circuit 41 becomes “H”, the blocking signal S10 that is the output of the malfunction prevention circuit 42 becomes “L” and the blocking signal S9 becomes “H”. As described above, the start signal S6 can be output from the start signal generation circuit 32. When the start signal S6 is output from the start signal generation circuit 32, the pressurization valve switching circuit 38 shown in FIG. The power supply path to the solenoid valve 21 is closed.
[0060]
By the way, if the outputs of the dress / weld changeover switch 40 are directly input to the CLR terminals of the FF circuit 51 of the chattering prevention circuit 31 and the FF circuit 53 of the start signal generation circuit 32, the dress / weld is switched. When the controller 3 is turned on with the changeover switch 40 set to the dress side, dressing is executed for one cycle before the CLR terminals of the FF circuits 51 and 53 become “H” and the dress start switch 5 is pressed. It will end up.
[0061]
Therefore, the malfunction prevention circuit 42 is provided with a combination of the delay circuit 59 including the resistor R4 and the capacitor C2 and two Schmitt trigger inverters, so that the dress / weld changeover switch 40 is set to the dress side. When the power is turned on, a blocking signal S9 that becomes “H” after a lapse of a predetermined delay time is output, and sufficient to reset the FF circuit 51 of the chattering prevention circuit 31 and the FF circuit 53 of the activation signal generation circuit 32. Time “L” input is given to the CLR terminals of the FF circuits 51 and 53 to prevent malfunction.
[0062]
On the other hand, when the dress / weld changeover switch 40 is set to the welding side, the transistor TR1 of the interlock receiving circuit 41 is turned off, the output signal S11 becomes “L”, and the blocking signal S9 of the malfunction prevention circuit 42 is “ Since the blocking signal S10 becomes “H” at “L”, the dress start signal S5 is not output even if the dress activation switch 5 is pressed, and the AND circuit 52 of the chattering prevention circuit 51 is closed, and the activation signal Since one input of the NOR gate circuit 56 of the generation circuit 32 is “H”, the output becomes “L” regardless of the other input, and the activation signal S6 is not output.
[0063]
Then, the hand dress operation procedure using this controller 3 will be described with reference to FIG. 12 as well. After the controller 3 is turned on, the dress / weld changeover switch 40 is set to the “dress” side. As described above, the welding timer 6 becomes inoperable and the welding machine cannot be operated.
[0064]
Under this state, 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. ) Is input to the chattering prevention circuit 31 of the controller 3, the dressing start circuit S5 is output from the chattering prevention circuit 31, and the start signal S6 is output from the start signal generation circuit 32, as shown in FIG. The pressurizing solenoid valve 21 is actuated by the pressurizing valve switching circuit 38 to open the air supply path, so that the upper gun 1A of the welding machine is lowered, and the dresser body 2 is sandwiched between the electrode tips 1a and 1b and pressurized. Is done. At this time, the applied pressure (chip dress pressure) is determined by the applied pressure level setting signal S2 for setting the applied pressure at the time of pre-pressurization by the chip dress pressure setting circuit 37 in accordance with the signal S12 from the timing generation circuit 33. Since it is output to the proportional valve 21, it is set to the pre-pressurizing pressure.
[0065]
In this case, when a problem such as alignment between the electrode tips 1a, 1b and the dresser body 2 occurs, the inching operation can be performed during pre-pressurization as described above, and therefore the depression of the dress starting switch 5 is released. As a result, the upper gun 1A of the welding machine is opened and the pressurization of the dresser body 2 by the electrode tips 1a and 1b is stopped, so that the dress activation switch 5 can be pressed again to perform alignment.
[0066]
Here, as shown in FIG. 12C, the pressurizing force is set such that the pressurizing force of the main pressurizing is set higher than the prepressurizing and the pressurizing pressure of the finishing pressure is set lower than the prepressurizing. When the dressing operation is performed by repeating the arm 11 of the dresser main body 2 while being pressed, it feels light at the time of initial pre-pressurization and becomes heavy when shifting to the main pressurization in the middle. Therefore, when the dress activation switch 5 is released, as described above, the self-holding (hold) state is established, so that it is possible to concentrate on the dressing operation.
[0067]
Furthermore, if the dressing operation is continued, the repetitive operation becomes lighter when shifting to the finishing pressure. Therefore, after performing the dressing operation several times, when the dress start switch 5 is pressed, the upper gun 1A is opened and the dressing is performed. The work is complete.
[0068]
In the above embodiment, the example in which the activation signal generation device according to the present invention is applied to the controller of the hand dresser has been described. However, in a device to which the activation instruction is given by manual operation, a predetermined time has elapsed since the activation instruction was given. Similarly, if the device is required to be able to be restarted until it is started, or if the device is required not to be restarted after a predetermined time has elapsed after giving the start instruction, the start according to the present invention is similarly applied. The signal generation device can be applied, and the target device is not limited.
[0069]
【The invention's effect】
As described above, according to the start signal generating device of the present invention, when the start start is instructed from the start switch means, the start switch means is instructed whether there is a start start instruction until the pre-pressurization time elapses. In response to this, a start signal is generated and output, and after the pre-pressurization time has elapsed, a start signal is generated and output until a start start instruction for the start switch means is issued again regardless of whether the start switch means has been instructed to start. So, by repeatedly depressing the start switch and releasing the depress until the pre-pressurization time elapses, For pressurizing the dresser body with an electrode tip during manual polishing The pressure drive system can be controlled to switch between pressurization and non-pressurization, After the pre-pressurization time has passed with the start switch depressed Since a start signal can be obtained without operating the start switch means, workability is improved.
[Brief description of the 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.
4 is a circuit diagram showing details of the chattering prevention circuit, the start signal generation circuit, the interlock reception circuit, and the malfunction prevention circuit of FIG. 3;
5 is a circuit diagram showing details of the timing generation circuit of FIG. 3;
6 is a circuit diagram showing details of a chip dress pressure setting circuit, a welding pressure setting circuit, etc. in FIG. 3;
7 is a circuit diagram showing details of the pressurizing valve switching circuit of FIG.
Fig. 8 External view of controller
FIG. 9 is a timing chart for explaining the operation of the chattering prevention circuit.
FIG. 10 is a timing chart for explaining the operation of the start signal generation circuit and the hold means.
FIG. 11 is a timing chart for explaining the operation of the timing generation circuit and the holding means.
FIG. 12 is an explanatory diagram for explaining chip dress work.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1A ... Upper gun, 1B ... Lower gun, 1a, 1b ... Electrode tip, 2 ... Dresser body, 3 ... Controller, 4 ... Pressure drive system, 5 ... Dress start switch, 6 ... Welding timer, 20 ... Pneumatic control valve , 21 ... Pressurizing solenoid valve, 31 ... Chattering prevention circuit, 32 ... Start signal generation circuit, 33 ... Timing generation circuit, 34 ... Hold command circuit, 35 ... Logic circuit, 37 ... Chip dress pressure setting circuit, 38 ... Pressurization Valve switching circuit, 41 ... interlock receiving circuit, 42 ... malfunction prevention circuit, 44 ... welding pressure setting circuit.

Claims (1)

In a start signal generating device used for a manually operated type chip dresser that holds a holder receiving member at the tip of a grip part so as to be swingable, attaches a holder to the holder receiving member, and holds and holds a polishing tip in the holder. The start signal generating device includes a start switch means for instructing start of start, and pressing and depressing of the start switch from when the start start instruction is issued from the start switch means until a predetermined pre-pressurization time elapses. By repeating the release, it is possible to switch between pressurization / non-pressurization of the pressurization drive system to pressurize the dresser body with the electrode tip during manual polishing, and the pre-pressurization time with the start switch held down start signal but after the expiration, characterized in that the pressure of the manually operated type tip dresser also release the depression of the start switch is held Generating device.

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