JPH04109319A - Method for positioning phase of waveform outputted from machine tool positioning device - Google Patents

Abstract

PURPOSE:To effectively position a machine tool by moving a piece of machinery at fixed speed and executing checking work on such as timing or existence of change between two waveforms by means of an NC device. CONSTITUTION:When measurement is started, a timer in a RAM 8 is initialized. When current time is included within a measuring time, i.e. a set sampling time, whether a change exists in the input of A or B phase is judged, and when the change exists, its changing time is counted by the number of oscillation clock pulses oscillated from an oscillator 9a, and the counted value and the waveform data are stored in the RAM 8. When the measured value reaches the set value, a measured result is displayed on a CRT 4 as S6 independently of the intervals of clock pulses as shown in Fig.2 (a), (b).

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for phase positioning of an output waveform in a positioning device for a machine tool. The present invention relates to a method for positioning an output waveform that is a two-phase pulse train having different phases.

[Prior Art] Sensors such as proximity switches and microswitches are used as positioning devices for tables, tool rests, etc. of numerically controlled (NC) machine tools. These sensors measure the rotation speed, rotation direction, and
Rotation angle can be detected. Two sensors are prepared, and as the rotation axis rotates, A with a phase difference of 90 degrees from each other.
, B2 phase pulse train (or approximate sine wave) is output. Further, the rotation direction can be determined from the phase relationship between the two phases A and B.

In this positioning device, a disk and a sensor are usually arranged so as to produce a precise phase difference of 90 degrees in the circumferential direction. To adjust the disks that generate the A and B phase signals and the mounting positions of the sensors, it was necessary to actually operate the mechanical equipment, connect an oscilloscope to the sensor, and perform visual observation from the oscilloscope's CRT screen. . This method requires an oscilloscope and requires time for adjustment.

[Problems to be Solved by the Invention] An object of the present invention is to provide a phase positioning method for the output waveform of a positioning device of a machine tool, which measures the time interval of on-off changes of A and B phase signals and displays the waveform. It is about providing.

Another object of the present invention is to provide a method for displaying the output waveform of a positioning device of a machine tool on an NC device in order to easily adjust the mounting positions of A and B phase sensors.

[Means and actions for solving the above problems] In order to solve the above problems, the following measures are taken.

a positioning device for an element constituting an NC machine tool; a first output signal of a first phase output from the positioning device;
A second output signal of a second phase outputted from the positioning device and having a phase different from the first output signal, and a waveform change of the second output signal and the second output signal are detected, and the detected elapsed time is temporarily stored. A phase positioning method of an output waveform of a positioning device of a machine tool, wherein the first and second output signals are stored in a means, and the first and second output signals are displayed in a constant width on a display means regardless of the magnitude of the elapsed time, and the positioning device is adjusted. be.

The display means is a display means for an NC device that controls the NC machine tool.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) are time charts showing A-phase and B-phase output waveforms of the positioning device. Figure 1(c)
1 is a time chart diagram showing clock pulses generated from A phase and B phase. FIG. 1(d) is a time chart showing the output pulses of the oscillator. FIG. 1(a) shows the A phase which is a leading signal, and FIG. 1(b) shows the B phase which is a delayed signal.

FIG. 1(c) shows a clock pulse signal, and by counting the number of clock pulses, the disk 10 (third
(see figure) shows the amount of rotation. If the encoder is operating normally, the phase difference between the A-phase and B-phase output waveforms is 90 degrees. The NC device or programmable controller is activated to rotate the shirt I to which the disk 10 is attached at a constant speed. With the measurement starting point as 0, the time when either phase A or phase B changes, that is, T I ,
T.J.

. . . Each elapsed time data from T8 and 0 point is measured in the counting circuit 9, and this is stored in the RAM 8 in the positioning device together with the states of the A and B phases.

In the clock shown in FIG. 1(c), clock pulses are generated at the times when the A-phase and B-phase signals change, that is, at the rising and falling points. This clock pulse can be realized with a well-known circuit using flip-flops. Therefore, this circuit will not be described in detail. The time interval of this clock pulse signal is measured as follows. The time interval of the clock pulses is measured by counting how many oscillating clock pulses from the oscillator 9a (see FIG. 3) enter the counting circuit 9 within the time interval of the clock pulses.

That is, the clock pulse signal controls the gate of the counting circuit 9, and the oscillator 9a during the clock pulse interval.
The rotational speed of the disk 10 is measured by accurately counting the number of pulses emitted from T,
, T2...T8 and are stored in the RAM memory. At the same time, the shape of the waveform is also sampled and captured at regular time intervals and stored in the RAM 5.

The following display is made from the stored elapsed time data and the waveform changes of the A and B phases. The stored waveform change, elapsed time data and T, , T2...T
To display the elapsed time of 8 at equal intervals regardless of the length of time. FIGS. 2(a) and 2(b) are examples of the display. That is, the displayed time axis is not proportional to the real time axis. Therefore, even in a system in which the A and B phases do not change for a long time, phase changes can be displayed within a fixed display range.

From this display, it can be determined whether the circle i10, sensors 11, 12, etc. are operating normally.

Further, while viewing this display, the mounting position of the sensors 11, 12 or the disk 10 can be easily adjusted.

A, B phase positioning control device FIG. 3 is a functional block diagram of the A, B phase positioning control device. CPU1 is connected to the NC device and this A.
, a central processing unit for controlling the entire B-phase positioning control device. CPU1 is connected to RO via bus 2.
M3 is connected. The ROM 3 stores a program for driving the A and B phase positioning control devices and for displaying as will be described later. CBr4 has the waveforms shown in FIG. 2 (a>, (b)) and T, , T2...T8.
The elapsed time is displayed.

(The RT controller 5 is a drive circuit for displaying on the CBr 4. The keyboard 6 is a board 1 equipped with various keys for inputting to the A and R phase positioning device. RAM 8 is the waveform change of the A phase or B phase and the time TL when either one changes.

T2. ...This is for storing the elapsed time data and waveform of T8. The count circuit 9 is a digital counter and outputs the A-phase and B-phase signals of the disc] O to the sensor 11.
, 12 is for taking and counting.

The count circuit 9 receives and receives the A-phase and B-phase output signals from the sensors 1, 1, and 12, and generates a lock pulse signal as described above using a circuit using built-in flip-flops (see Fig. 1). c). Furthermore, Karan 1-times i
9 is the oscillator 9 within the time interval of this clock pulse signal.
The time interval between clock pulse signals is measured by counting how many oscillation clock pulses are received.

The sensors 11 and 12 of this embodiment detect the protrusion 13 provided on the disc]0 and output A-phase and B-phase waveforms. Furthermore, the A-phase and B-phase output signals are input to the bus 2 via the input capo-I-14. The drive unit 15 is connected to drive means or driven means such as a motor for rotationally driving the disc 10 . Drive commands such as clockwise rotation and counterclockwise rotation are issued to the drive unit ]5 via the output capos 1 to ]6.

Operation flow of A and B phase position method FIG. 4(a) shows A provided in the NC device.

FIG. 3 is an operation flow diagram showing an outline of an operation for the B-phase position measurement control device to measure the A and B phases and display them on CBr4 of the NC device. When measurement starts, a timer in RAM 5 is initialized (Sl). A or B within the measurement time, that is, within the set sampling time
To judge whether there is a change in the phase input (S3), if there is a change, the change time is counted by the number of oscillation clock pulses emitted from the oscillator 9a in the counting circuit 9, and the number and waveform data are sent to the RA. , store it in M8 (S4). If the measured number reaches the set number (S5), the measurement result is displayed on the CBr4 regardless of the clock pulse interval as shown in Figure 2 (a) and (b) (S6). .

Other Embodiments In the embodiment described above, the protrusion 13 provided on the disc 10 is detected in an inductive manner using the proximity sensors 11 and 12 to obtain an output waveform, but the present invention is not limited thereto. It can also be applied to other methods such as a photoelectric switch method in which a slit is provided in a disk and light is transmitted through the slit, or a magnetic switch method in which magnetism is detected. Further, the present invention is applicable to both absolute type and incremental type.

[Effects of the Invention] As detailed above, in order to adjust the position of the A and B phase sensors and docks of this invention, the mechanical device is moved at a constant speed, and the A and B waveforms at that time are measured using an oscilloscope. The timing of the waveform and the presence or absence of cracks were checked by observing the waveform using a computer, etc., but these tasks can be performed on an NC device and can be accomplished without connecting a separate measuring device.

[Brief explanation of the drawing]

Figures 1 (a) and (1)) are diagrams showing examples of actual waveforms of the positioning device, Figure 1 (c) is a time chart diagram of a clock signal, and Figure 1 (d) is a diagram showing an oscillation clock. Time charts 1 to 1, and Figures 2 (a) and (b) do not show the waveforms displayed on the CRT. The figure is a flow diagram showing the operation of the A and B phase determining device. 1...CPU, 3...ROM, 4...CRT, 5
...OR, T controller, 6...keyboard, 8
...RAM, 9...Karan I circuit, 10...Disk, 11.12...Sensor, 14...Input board, 1
5... Drive unit, 16... Output boat

Claims (1)

[Claims] 1. A positioning device for an element constituting an NC machine tool, a first output signal of a first phase output from the positioning device, and a first output signal output from the positioning device. Detecting waveform changes of a second output signal of a second phase having different phases and the first and second output signals, storing the detected elapsed time in a temporary storage means, and determining whether the detected elapsed time is related to the magnitude of the elapsed time. A method for positioning a phase of an output waveform of a positioning device of a machine tool, the method comprising: displaying the first and second output signals on a display means with a constant width, and adjusting the positioning device. 2. A method for positioning a phase of an output waveform of a positioning device for a machine tool according to claim 1, wherein the display means is a display means for an NC device that controls the NC machine tool.