JPH09136131A - Position detecting circuit for numerical command device in spring production device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the detecting precision of the rotation amount and the rotation angle of a main shaft without being influenced with chattering by forming a position detecting circuit for a spring production machine into a four-multiple circuit of two phase pulse obtained from a rotary encoder installed on a main shaft of the production machine. SOLUTION: A phase detecting circuit 62 to detect the phase quadrant from A and B two phase pulses of a rotary encoder, and a vibration preventing circuit 63 to output phase pulses e, f whose phases are different by 90 deg. to the two phase pulses A and B based on phases a, b, c, d and which have hysteresis are installed. Further, the position detecting circuit is composed of a rotary direction discriminating circuit 64 to detect a normal rotation signal i and a reverse rotation signal j of the rotary encoder 24 based on these phase pulses e, f, an exclusive OR circuit 65a to obtain a repeating pulse k for researching the exclusive OR of the phase pulses e, f and pulse generating circuits 65, 66 to obtain a normal rotation pulse n and a reverse rotation pulse p based on the signals of the repeating pulse k and the rotary direction discriminating circuit 64.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detection circuit for a numerical command device in a spring manufacturing apparatus suitable for improving the position detection accuracy of a spindle of a spring machine by numerical control.

[0002]

2. Description of the Related Art Conventionally, a rotary encoder has been used as a means for detecting a rotation amount and a rotation angle.
For example, there is a drawback that the detection accuracy of the rotation amount and the angle deteriorates due to the occurrence of chattering during the start / stop control of the axis. In particular, when chattering occurs, the shaft moves so that the shaft reverses from normal rotation to normal rotation again, so three pulses are output even though one pulse is originally obtained, and the detection accuracy is increased. There was a problem that was worse.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to accurately detect the rotation amount of a shaft even if chattering occurs on the shaft. Moreover, it is another object of the present invention to provide a position detection circuit for a numerical command device in a new spring manufacturing device in which the detection resolution of the rotation amount is improved four times.

[0004]

In order to solve the above-mentioned problems, the position detection circuit of the numerical command device in the spring manufacturing apparatus of the present invention is a rotary encoder which outputs a two-phase pulse of A phase and B phase, A phase detection circuit that detects the phase quadrant of the rotary encoder from the two-phase pulses of the A-phase and the B-phase, and the 90-degree phase difference from the two-phase pulse based on the phase pulse detected by the phase detection circuit, and
A vibration prevention circuit that outputs two phase pulses having hysteresis, and a rotary encoder that detects a forward rotation signal that indicates normal rotation and a reverse rotation signal that indicates reverse rotation of the rotary encoder based on the phase pulse output from the vibration prevention circuit. A rotation direction discriminating circuit, an exclusive OR circuit for obtaining a repeating pulse whose level changes for each phase quadrant of the rotary encoder by obtaining an exclusive OR of the two phase pulses, and the exclusive OR circuit The pulse generator circuit obtains a quadruple normal rotation pulse and a reverse rotation pulse based on the forward rotation signal and the reverse rotation signal obtained by the rotation direction discrimination circuit.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a position detecting circuit of a numerical command device in a spring manufacturing device of a numerical control command device in a spring machine according to the present invention will be described with reference to FIGS. FIG. 1 shows numerical control (hereinafter, NC (Numeri)
FIG. 2 is a block diagram for explaining the control operation of the NC command device and the main spindle and the slave shaft, and FIGS. 3 to 6 are various spring machining machines. Therefore, FIG. 3 is a block diagram of the hot coiling machine, FIG. 4 is a block diagram of the hot leaf spring rolling machine, and FIG.
Is a block diagram of a hot barrel type spring coiling machine, and FIG. 6 is a block diagram of a cold coiling machine. FIG. 7 is a circuit diagram of a quadrupling circuit for quadrupling a two-phase pulse obtained from a rotary encoder provided on the main shaft of the spring machine of FIGS. 3 to 6, and FIGS. 8 to 12 are operations of the quadrupling circuit. It is a timing chart showing the waveform of each part of the state.

First, before describing the position detection circuit of the present invention, various spring manufacturing machines using the circuit of the present invention and an NC command device for controlling the spring manufacturing machine will be described.

In FIG. 1, reference numeral 1 is an NC command device,
The NC command device 1 is provided with an input / output device such as a keyboard 2 for inputting numerical data, a floppy disk 3 for reading stored data, a monitor 4 for displaying input data and operating conditions, and a printer 5 for printing out data. There is. Reference numeral 6 denotes an arithmetic control unit, and this arithmetic control unit 6
Has an arithmetic CPU section 7 and a control counter section 8. Reference numeral 9 is a computer which is an externally connected device of the NC command device 1, 10 is a sequencer, and this sequencer 10 is connected to the arithmetic control unit 6 through an input / output interface 11 provided in the NC command device 1. .

Reference numeral 20 denotes a hot coiling machine controlled by the NC command device 1. The hot coiling machine 20 controls a powder metal clutch / brake 22 and an air clutch / brake 23 for rotating a spindle by a core bar rotation control driver 21. To do. A rotary encoder 24 is provided for the rotation of the main shaft to output rotation information to the NC command device 1. 2
5 is a guide roller, and this guide roller 25 is DC
A servo motor 26 and a hydraulic servo cylinder 27 are provided to control the slave axis movement. Reference numeral 30 denotes a hot leaf spring rolling machine controlled by the NC command device 1. The hot leaf spring rolling machine 30 drives a length measuring carriage 31 by an AC servo motor 32, and a moving pulley of the length measuring carriage 31 is moved. The movement information of the length measurement carriage 31 is taken out by the attached first rotary encoder 33. Further, the rotation amount of the rolling roll 34 is detected by the second rotary encoder 36, and the slave shaft movement control of the hydraulic servo cylinder 35 is performed based on the rotation amount of the rotary encoder 33 or the rotary encoder 36 to obtain a leaf spring having a predetermined shape. To manufacture.

Reference numeral 40 denotes a hot barrel type spring coiling machine controlled by the NC command device 1. The hot barrel type spring coiling machine 40 has a forming roll 41 and a DC servo motor 42.
In addition to controlling the position with, the molding roll rotation control driver 43 controls the powder clutch / brake 44,
Further, the spindle rotation information of the forming roll 41 is output to the NC command device 1 using the rotary encoder 45. Also,
The NC command device 1 controls the slave axis movements of the forming roll 41 and the pitch tool 46 by the DC servo motors 42 and 47, respectively, based on the data obtained by the rotary encoder 45, to generate a barrel-shaped coil. 50 is an NC command device 1
The cold coiling machine 50 is driven by the feed roll rotation control driver 51 and drives the pulse motor 52 while controlling the electromagnetic clutch / brake 53 to rotate the feed roll. . The rotary encoder 54 outputs the rotation information of the feed roll to the NC command device 1. On the other hand, the NC command device 1 drives the molding tool 55 with the pulse motor 56 based on the data of the rotary encoder 54,
Also, the pitch tool 57 is driven by the pulse motor 58,
A coil having a predetermined shape is generated.

The NC command device 1 thus constructed controls the operation of each of the above various spring machining machines, takes in the spindle rotation information of the spring machining machine by the rotary encoder, and controls the slave axis movement with respect to the spindle rotation. There is. FIG. 2 shows the control of the NC command device 1 and the main shaft / slave shaft of the spring machine, and the same parts as those in FIG. The calculation controller 6 of the NC command device 1 calculates the calculation CP
The calculation CPU comprises a U section 7 and a control counter section 8.
The section 7 is composed of a 16-bit main CPU 7a that processes data by data operation software and an 8-bit sub CPU 7b that issues a rotation control drive command for the spring machine, and these two CPUs provide high-speed and high-precision data. Processing can be performed. The main CPU 7a is connected to an input / output device such as a keyboard 2 and a floppy disk 3 via an interface 6a via a data bus 6b to perform various data processing. The sub CPU 7b is used for operating information of the sequencer 10 and each spring manufacturing machine. Based on the output of the rotary encoder provided on the main spindle and the control output of the CPU 7a, rotation control of the main spindle of the spring processing machine and control of the slave spindle are performed.

In the NC command device 1 thus constructed,
The spring processing data is directly input to the predetermined spring processing machine from the keyboard 2 or the data I is input from the keyboard 2.
By inputting the D number, it is called from among the contents recorded on the floppy disk 3 and set in the main CPU 7a of the arithmetic control unit 6. These setting data can be confirmed on the monitor 4, and at the same time, the operating state of the spring machine can be displayed on the monitor 4. Further, the data input from the keyboard 2 can be written in the floppy disk 3, and the input data and the data read from the floppy disk 3 can be printed out by the printer 5. The keyboard 2 and the monitor 4
Since the operation control unit 6 and the operation control unit 6 are connected by an optical fiber cable, the operation panel of the keyboard 2 and the monitor 4 can be arranged at a predetermined place several hundred meters apart in a large factory. It is possible to control the arithmetic and control unit 6 of the command device 1 at high speed and surely from a distant place.

Interface 6a of the arithmetic control unit 6
Is a computer 9 and RS-232C that are externally connected devices
The computer 9 can be used to control not only numerical data collectively for various spring machines but also production order, time management, and the like. Also, the sequencer 10
Is configured to monitor and control a predetermined interlocking state of each spring processing machine to execute automated production for safe and diversified spring products.

The control counter section 8 detects, for example, rotation information of the spindle 28 of the hot coiling machine 20 from the rotary encoder 24 as a spindle movement amount, and a spindle multiplication circuit for multiplying the spindle movement pulse of the rotary encoder 24 by 4. 8a and a tracing control circuit 8b for tracing the slave axis based on the output pulse of the quadruple multiplication circuit 8a. The tracing control circuit 8b is the main CPU 7a.
Hot coiling machine 20 based on the control data set in
The slave spindle moving feed command of the guide roller 25 is output to the actuator, and timing information such as control and data switching is interrupted and input to the main CPU 7a and the sub CPU 7b, so that the slave spindle corresponding to the movement amount of the spindle 28 is moved. Running control.

Next, an outline of each spring manufacturing machine will be described. FIG. 3 is a block diagram of the hot coiling machine 20, and the core bar rotation control driver 21 is the clutch / brake 2.
The torque control of 2 and 23 is performed. The clutch / brake 22 and 23 are directly connected to the motor 21a and the speed reducer 21b, and the clutch controls the transmission of the rotation of the motor 21a to the speed reducer 21b. Alternatively, it has a brake device for stopping the rotation of the motor 21a. A cored bar 28, which is a main shaft, is directly connected to the speed reducer 21b, and the rotation of the cored bar 28 is controlled by the rotation control from the cored bar rotation control driver 21. As shown in FIG. 2, the rotation control of the main shaft is performed by supplying the rotation data detected by the tacho generator (TG) 28a connected to the main shaft 28 to one input terminal of the comparison circuit 21c so that the speed feedback circuit (F .B.). On the other hand, the drive data from the sub CPU 7b is supplied to the other input terminal of the comparison circuit 21c, the comparison circuit 21c controls the clutches / brakes 22 and 23 based on the drive data, and the main shaft rotates in a predetermined rotation. Controlled by the number.

The end of the coil material 29 is fixed to the starting end 28a of the cored bar 28 of the hot coiling machine 20, and the coiled material 29 is wound along the cored bar 28 for coiling. In this coiling, the grooved guide roller 25a is DC
It is controlled by a slave shaft moving guide mechanism 25b that is moved by a servo motor 26 or a hydraulic servo cylinder 27, and positions a coil material 29 on a cored bar 28 to perform coiling at a predetermined pitch. As shown in FIG. 2, this slave axis movement is provided with a slave axis drive servo mechanism, and the position data of the grooved guide roller 25a is detected by the detector 25d.
Detected by the position feedback circuit (F.
B. ) Is formed, and the other input terminal of the comparison circuit 25e is supplied with the slave axis feed command output from the profile control circuit 8b of the arithmetic control unit 6 of the NC command device 1, and based on this slave axis feed command. The grooved guide roller 25 is controlled by controlling the DC servo motor 26 and the hydraulic servo cylinder 27.
It controls the slave axis movement of a.

Next, FIG. 4 is a block diagram of the hot leaf spring rolling machine 30. The leaf spring material 37 is rolled by the rolling roll 34. The thickness of the leaf spring to be rolled is the same as that of the hydraulic servo cylinder 35. It is set by the slave axis movement by driving. On the other hand, the length-measuring carriage 31 is attached to a drive wire 31b laid on a moving pulley 31a driven by a rotation clutch / brake 32b of an AC servomotor 32, and the length-measuring carriage 3 is moved based on the movement of the drive wire 31b.
A move of 1 is set. The AC servomotor 32 is provided to move the length measuring carriage 31 to a predetermined position in advance, and a clutch / brake 32b is provided between the AC servomotor 32 and the moving pulley 31a.
When moving the measuring carriage 31, the clutch is turned on, the brake is turned off, and when stopped, the clutch OF is turned off.
F and the brake are turned on, and in the case of the profile control, both the clutch and the brake are turned off to let the leaf spring move. Then, the first rotary encoder 33 detects the moving state, position, etc. of the length-measuring cart 31, and the rotation data of the first rotary encoder 33 is supplied to the arithmetic control unit 6 of the NC command device 1, and the profile control circuit The hydraulic servo cylinder 35 is slave-axis controlled by the slave-axis feed command from 8b. In this apparatus, the hydraulic servo cylinder 35 can also be controlled by the second rotary encoder 36 provided on the rolling roll 34 without using the length measuring carriage.

FIG. 5 is a block diagram of the hot-spring type spring coiling machine 40. The coil material 48 has two forming rolls 41 abutting on the outer contact portion of the coil material 48 as shown in the figure.
The a and 41b and the forming roll 41c that is in contact with the inner contact portion of the coil material 48 are rotationally driven via the clutch / brake 44 by the driving of the forming roll rotation driver 43. By the rotation of the forming rolls 41a, 41b, 41c, the coil material 48 is formed into the forming rolls 41a, 41b, 4
Coiling is performed after passing through 1c. The rotation data of the forming rolls 41a, 41b, 41c is taken out by the rotary encoder 45, and this data is supplied to the arithmetic control unit 6 of the NC command device 1.

The NC command device 1 includes a rotary encoder 4
By controlling the relative positions of the forming rolls 41a and 41b based on the detection data of No. 5, spindle control is performed so as to obtain a coil curved to a predetermined curvature. That is, the positions of the molding rolls 41a and 41b are set by the molding roll 41c.
The forming roll 41a corresponds to the position of the DC servomotor 4
2a performs follower control of the forming rolls 41a and 41b, and the forming roll 41b also moves along the direction of arrow B by the DC servomotor 42b.
The coiling bending process is performed by the relative positions of b and 41c.

On the other hand, the pitch tool 46 can be slidably driven in the direction of arrow C by the DC servo motor 47 to obtain a desired coil pitch by the slave axis movement. By controlling the relative positions of the forming rolls 41a, 41b, 41c while pressing the coil material 48 in the diametrical direction and controlling the pitch tool 46, it is possible to generate a desired barrel-shaped coil.

FIG. 6 is a block diagram of the cold coiling machine 50. The feed roll rotation control driver 51 drives and controls the pulse motor 52 and also controls the operation of the clutch / brake 53 directly connected to the pulse motor 52. The individual feed rolls 51a and 51b are rotationally driven. The coil material 59 is nipped and passed through the gap between the two feed rolls 51a and 51b, and is pressed by the forming tool 55 which is slave-axis controlled by the pulse motor 56 and the pitch tool 57 which is slave-axis driven by the pulse motor 58. The coil material 59 is formed into a coiling having a desired curvature. The control of the forming tool 55 and the pitch tool 57 is controlled by the rotation data from the rotary encoder 57 that takes in the spindle movement information of the coil material 59 to the arithmetic control unit 6 of the NC command device 1 as in FIGS. It

The hot coiling machine 20, the hot leaf spring rolling machine 30, the hot barrel type spring coiling machine 40, and the NC command device 1 thus constructed by various input / output devices and the arithmetic and control unit 6 etc. The coiling work of various spring processing machines such as the cold coiling machine 50 can be operated by NC control. Particularly, in the coiling control of the spring processing machine, it is possible to accurately generate a desired coiling with high accuracy by performing arithmetic processing of the spindle movement through the rotary encoder to control the slave axis movement. Further, the rotation data processing from the rotary encoder is performed by a quadruple multiplication circuit 8a.
To prevent vibration (chattering) by using
Since it is possible to obtain a spindle detection resolution that is four times as high as the rotation data of the rotary encoder, it is possible to perform more precise slave axis movement control.

Next, the position detection circuit of the numerical command device in the spring manufacturing apparatus of the present invention will be described based on the circuit diagram of FIG. 7 and the timing charts of FIGS. 8 to 12.
The two-phase pulse of the A phase and the B phase having the phase difference of 90 degrees generated from the rotary encoder 24 of the hot coiling machine 20 is transmitted through the respective interfaces 60 and 61 to 4
It is supplied to the phase detection unit 62 of the multiplication circuit 8a. FIG. 8 is a timing chart showing the operation of the quadrupling circuit 8a. FIG. 8 (a) shows the operation at the time of normal rotation of the spindle movement, and FIG. 8 (b) shows the operation at the time of reverse rotation. is there. The waveforms of symbols A and B in this timing chart represent two-phase pulses of A phase and B phase determined by the axial angle of the rotary encoder 24. The phase detector 62 includes two sets of inverting inverters 62a and 62b and four positive NAND (NAND) gate circuits 62c, 62d, 62e and 62.
4 phase quadrants in one cycle of the two-phase pulses A and B. The second phase quadrant (90 ° to 180 °) is detected by the pulse signal a obtained at the output of the NAND gate circuit 62c.
Similarly, b is the fourth phase quadrant (270 ° to 360 °), c
Is the third phase quadrant (180 ° to 270 °), and d is the first phase quadrant (0 ° to 90 °).

The pulse signals a, b, c, d of each phase quadrant detected in this way are supplied to the chattering prevention unit 63. The chattering prevention unit 63 forms two JK flip-flop circuits 63a and 63b composed of NOR gate circuits, and again from the pulse signals a and b and the pulse signals c and d at a 360 ° cycle. Two phase pulses e and f which are 90 ° out of phase are output. The phase pulses e and f are supplied with JK flip-flop circuits 63a and 6a.
By using 3b, the rotary encoder 24 is provided with a hysteresis characteristic that causes a phase shift of ± 90 ° due to a difference in rotation direction due to normal rotation and reverse rotation, and normal rotation to reverse rotation (or reverse rotation to normal rotation).
By setting dead time when changing direction to
The occurrence of mispulses due to chattering such as shaft vibration of the rotary encoder 24 is prevented.

The phase pulses e and f of the chattering prevention circuit 63 are supplied to the rotational direction discriminating unit 64 composed of D flip-flop circuits 64a and 64b, and the phase states of the two phase signals e and f are detected and held. Then, the direction of rotation is discriminated. Two sets of D flip-flop circuits 64a and 64b are used in the rotation direction discriminating unit 64. That is, D
The flip-flop circuit 64a detects normal rotation, and the D flip-flop circuit 64b detects reverse rotation. And
At the time when the Q output of the D flip-flop circuit 64a rises, that is, when the normal rotation is detected, the Q output of the D flip-flop circuit 64b is already at the "L" level and the detection signal indicating the reverse rotation is lowered. ing. And
The Q output waveform g of the D flip-flop circuit 64a and the Q bar output waveform h bar of the D flip-flop circuit 64b are taken into the AND gate circuit 64d, and D
By supplying the Q output waveform g bar of the flip-flop circuit 64a and the Q output waveform h of the D flip-flop circuit 64b to the AND gate circuit 64c, the normal rotation signal i indicating the normal rotation and the reverse rotation indicating the reverse rotation. We get the signals j and.

Further, the phase pulses e, f of the chattering prevention unit 63 and the output signals i, f of the rotation direction discriminating unit 64.
A quadruple output is generated by j as follows. First,
The phase pulses e and f are converted into XOR (Exclusive).
OR) first doubler of circuit 65a (pulse generation circuit)
A repeating pulse signal k having a cycle of 180 ° is generated by supplying an exclusive OR of two phase pulses to the signal 65. This repeated pulse signal k is applied to the chattering prevention unit 63.
90 ° phase in forward / reverse due to the hysteresis characteristics of
Moving. On the other hand, the output signals i, j of the rotation direction discrimination unit 64
And the repetitive pulse signal k which is the output of the first doubler 65 is supplied to a second doubler (pulse generation circuit) 66 which further doubles it. The second doubler 66 supplies the output signals i, j to the AND gate circuits 66a, 66b.
And the repetitive panel signal k is input, and a pulse having the same 180 ° cycle as the repetitive pulse signal k is output. In FIG. 8A, the output pulse l of the AND gate circuit 66b with respect to the normal rotation signal i in the normal rotation state (indicated by the arrow direction of each waveform).
Is output as an output signal with a cycle of 180 °, and the reverse signal j
The output signal m of the AND gate circuit 66a on the side does not appear as shown in the figure.

The one-shot pulse circuits 66e, 6 are supplied with the double pulse 1 in the forward direction, which has been discriminated in the direction of rotation in this way.
By supplying 6f to the positive and negative edges of the output pulse 1, that is, the positive rotation pulse n which is quadrupled from the two-phase pulse which is the output of the rotary encoder 24 at a 90 ° cycle, is a positive NOR (NOR) circuit. 6
It can be output from the output terminal 67b as a spindle movement pulse via 6h. On the other hand, at the time of reverse rotation, as shown in FIG. 8B (in the figure, the rotation state is indicated by the arrow direction), the output pulse m is output to the output of the gate circuit 66a by the reverse rotation signal j which discriminates the reverse rotation direction by the rotation direction discrimination unit 64b. Is obtained,
From the one-shot circuits 66c and 66d which operate at the rising and falling edges of the output pulse m, the reverse pulse p multiplied by 4 in a 90 ° cycle is fed to the positive NOR (N).
OR) output terminal 6 for the spindle movement pulse via circuit 66g
Can be output to 7a.

FIG. 8B is a timing chart showing the reverse rotation state. In the state where the A-phase and B-phase pulses are output from the right to the left in the figure, the phase pulses e and f are obtained. Then, the forward rotation signal i is reset at the position of 270 ° in the figure, and the reverse rotation signal j rises at the next position of 180 °. Therefore, the reverse pulse p having the quadruple detection capability based on the repeated pulse k is obtained.

As described above, the output signal of the rotary encoder 24 for detecting the main shaft movement of the spring working machine, for example, the hot coiling machine 20 is supplied to the quadruple multiplication circuit 8a, resulting in a quadrupled output. Pulses n and p are obtained, which makes it possible to control the slave axis with four times the detection resolution. Moreover, as described above, the JK flip-flop circuits 63a and 63b and the D flip-flop circuit 64 are provided.
Due to the 90 ° dead time due to the hysteresis characteristics of a and 64b, a total of 180 ° dead time can be obtained, and the occurrence of miscount pulses due to the chattering phenomenon of the rotary encoder 24 can be prevented. 9 and 10 show that chattering due to shaft vibration of the rotary encoder occurs near 0 °, passes through the phase angle of 0 ° in the forward rotation direction, then reverses, passes through 0 ° again, and returns again in the forward rotation direction. 3 shows signal waveforms of respective parts for chattering that changes to 0 and passes through 0 °.

As shown in FIG. 10, during reverse rotation, the phase pulses e and f are both kept at "L" level, and the normal rotation signal i indicating the rotation direction is at "H" level. Is shown. In this state, the repetitive pulse k
Also at "L" level, no output pulse is obtained at the output terminals 67a and 67b. Then, the normal rotation state is again entered, and the phase pulse e rises at the position of 90 °, so that the output of the repeating pulse k is started and the normal rotation pulse n is obtained again. Even if chattering occurs, the miss pulse is not output.

11 and 12 show a state in which chattering has occurred near 270 °, and in this case as well, the phase pulses e and f are kept at the "L" and "H" levels, respectively, and the normal rotation signal is generated. Both i and the repeating pulse k are held at the "H" level. For this reason, since the phase pulse f is output again in the state of returning to 0 °, the output terminal 67 is output again.
A forward rotation pulse n is obtained at b.

Although the pulse output timings have been described above in the case of the phase angles of 0 ° and 270 °, unnecessary chattering pulses are generated due to the dead time of the hysteresis characteristic at any other pulse output timing phase angle. It is clear to prevent the occurrence. In this way, the output signal of the quadrupling circuit 8a which prevents the generation of unnecessary chattering pulses and the rotation direction discrimination switching due to chattering can detect the high-precision spindle movement state having a resolution four times the original, This high-resolution spindle detection signal is applied to the "tracing" control circuit 8b, and a slave-axis feed command is supplied to the slave-axis driver mechanism to accurately execute slave-axis movement with respect to the spindle movement of various spring machines. Therefore, more accurate coiling work can be performed.

[0032]

Since the position detection circuit of the numerical command device in the spring manufacturing apparatus according to the present invention is configured as described above, it is preferable that the main shaft of the spring machine is stopped on the phase quadrant boundary line of the rotary encoder. It is possible to prevent the occurrence of miss pulses due to the shaft vibration of the rotary encoder. If the main shaft oscillates n times on the phase quadrant boundary of the rotary encoder, n miss pulses will be generated by this, and the actual command to the slave shaft will be issued, which will cause malfunction of the device and adversely affect the machining shape. Result in poor product quality. Further, there is an effect that the quadruple multiplication circuit can obtain a quadruple resolution with respect to the detection signal of the rotary encoder, and more highly precise slave axis movement control can be performed. Further, it can be used in a wide range of applications such as a hot or cold coiling machine and a hot leaf spring rolling machine, and has a simple structure and can be constructed at low cost, so that it is easy to implement. It has excellent features such as. Actually, there is a difference in the degree of variation between hot and cold compared with the conventional device, but there are variations in the taper portion of the leaf spring, the free length of the coil spring, and the diameter of the coil. About 25% to 50
%, Which is extremely high quality.

[Brief description of the drawings]

FIG. 1 is a block diagram of a numerical control device and various spring processing machines showing an embodiment of a position detection circuit of a numerical command device in a spring manufacturing device according to the present invention.

FIG. 2 is a block diagram showing a control operation of an NC command device and a main axis movement / slave axis movement.

FIG. 3 is a block diagram of a hot coiling machine.

FIG. 4 is a block diagram of a hot leaf spring rolling machine.

FIG. 5 is a block diagram of a hot barrel type spring coiling machine.

FIG. 6 is a block diagram of a cold coiling machine.

FIG. 7 is a circuit diagram of a quadruple multiplication circuit that multiplies the two-phase pulse of the rotary encoder by four.

FIG. 8 is a timing chart showing the waveform of each part in the normal rotation and reverse rotation states of the quadruple multiplication circuit.

FIG. 9 is a diagram illustrating the level of each main part near 0 °.

FIG. 10 is a diagram showing a state in which chattering occurs in the vicinity of 0 ° and the rotation is reversed.

FIG. 11 is a diagram illustrating a level of a main part near 270 °.

FIG. 12 is a diagram showing a state of being reversed around 270 °.

[Explanation of Codes] 1 NC command device 6 Arithmetic control unit 7 Arithmetic CPU unit 7a Main CPU 7b Sub CPU 8 Control counter unit 8a 4 multiplication circuit 8b Tracing control circuit 20 Hot coiling machine 30 Hot leaf spring rolling machine 40 Hot Barrel type spring coiling machine 50 cold coiling machine 62 phase detector 63 vibration preventer 64 rotation direction discriminator 65 first doubler (pulse generator) 66 second doubler (pulse generator)

Claims (1)

[Claims] 1. A rotary encoder for outputting two-phase pulses of A phase and B phase, a phase detection circuit for detecting a phase quadrant of the rotary encoder from the two-phase pulse of A phase and B phase, and the phase detection circuit. A vibration preventing circuit that outputs two phase pulses having a 90 degree phase difference from the two-phase pulse and having hysteresis based on the phase pulse detected by the above, and a rotary based on the phase pulse output from the vibration preventing circuit. A rotary direction discriminating circuit for detecting a forward rotation signal indicating forward rotation and a reverse rotation signal indicating reverse rotation of the encoder, and a level for each phase quadrant of the rotary encoder by obtaining an exclusive OR of the two phase pulses. , An exclusive-OR circuit for obtaining a repeating pulse whose value changes, and a repeating pulse and the rotation obtained at the output of the exclusive-OR circuit. Position detection of a numerical command device in a spring manufacturing device, characterized by comprising a pulse generating circuit for obtaining a quadruple normal rotation pulse and a reverse rotation pulse based on a normal rotation signal and a reverse rotation signal obtained by a direction discrimination circuit. circuit.