JPH042885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention Industrial Application Field The present invention relates to an inspection device that inspects the pulse pitch of a rotary encoder and displays whether it is normal or abnormal on an analog monitor.

Conventionally, when inspecting the pulse pitch of a rotary encoder, the encoder pattern is directly enlarged and the pattern pitch dimension is measured, or the output pulse of the rotary encoder is measured pulse by pulse over one rotation by electrical means. I found a method etc.

Problems to be Solved by the Invention In the conventional configuration as described above, the higher the resolution of the encoder, the more time and effort it takes to enlarge and measure the pulse pattern in the former, and to divide and measure the output pulses of one revolution in the latter. It was a time-consuming task.

The present invention solves the above-mentioned drawbacks, and while rotating the reference rotary encoder and the rotary encoder to be inspected on the same axis, it is possible to clear the error every rotation and display the abnormal output pulse portion in analog on the monitor. The purpose is to provide an inspection device.

(2) Means for solving the structural problems of the invention The rotary encoder inspection device of the present invention is provided with a reference rotary encoder having a division accuracy of n times on the same axis as the rotary encoder to be inspected. The difference between n times the number of output pulses and the number of output pulses of the reference rotary encoder is converted into an analog value, the number of output pulses of the reference rotary encoder is converted into an analog value, and each of the above outputs is converted using the origin signal of the reference rotary encoder. The number of pulses is cleared, and the difference in the number of pulses between the rotary encoder to be inspected and the reference rotary encoder during one rotation is always output to the X-Y monitor, making it possible to inspect the pulse pitch while rotating. be.

Effects In the present invention, the reference rotary encoder and the rotary encoder to be inspected are rotated on the same axis and are cleared by the origin signal of the reference rotary encoder, so inspection can be performed from anywhere during rotation.

Since the reference rotary encoder has n-fold division accuracy, the rotary encoder to be inspected can also be inspected by multiplying the calculations by n-fold, making it possible to make accurate judgments. Moreover, the difference between the measured values from each rotary encoder is displayed in analog on the X and Y axes of the monitor.
The displacement of the output pulses can be displayed at a glance, making continuous visual inspection possible without stopping the rotation of the rotary encoder to be inspected.

Example Hereinafter, an example will be described based on FIGS. 1 to 3. FIG. 1 is a block diagram illustrating the present invention. 1 is a rotary encoder to be inspected, 2 is a reference rotary encoder with n times division accuracy, 3 is a motor that rotates each of the above encoders 1 and 2 on the same axis, 4 is a rising edge of the output pulse of the rotary encoder 1 to be inspected, A counter that detects and counts the falling edge; 5 is an arithmetic unit that multiplies the value of the counter 4 by n; 6 is a counter that detects and counts the rising and falling edges of the output pulse of the reference rotary encoder 2; 7 is the value of the arithmetic unit 5. 8 is an A-D converter that converts the output of the subtracter 7 into an analog value; 9 is an A-D converter that converts the value of the counter 6 into an analog value; The -D converter 8 is connected to the Y-axis of the monitor 10, and the A-D converter 9 is connected to the X-axis of the monitor 10. The origin signal of the reference rotary encoder is passed through the waveform shaping circuit 11 to the counters 4 and 6, the n-fold calculator 5, and the subtracter 7.
connected to the clear terminal of Therefore, the monitor's
The axis represents the pulse pitch error of the rotary encoder to be inspected, and the Y axis represents the rotation angle during one rotation.

FIG. 2 shows a case where the pulse pitch of the rotary encoder to be inspected is normal, and FIG. 3 shows a case where it is abnormal.
The standard rotary encoder has twice the division accuracy. In Figure 2, a is the output pulse waveform of the rotary encoder under test, b is the origin signal of the reference rotary encoder, c is the output pulse waveform of the reference rotary encoder, d is the rising and falling waveforms of the output pulse of the rotary encoder under test, and e is twice the count value of the rising and falling pulses of the output pulse of the rotary encoder under test during one rotation, f is the waveform of the rising and falling pulses of the reference rotary encoder output pulse, and g is the count during one rotation. h is the subtracted value of each value, and i is the waveform of the subtracted value on the X-Y monitor.

In Fig. 3, a is the output pulse waveform of the rotary encoder under test, b is the output pulse waveform of the reference rotary encoder, c is the rising and falling waveforms of the output pulse of the rotary encoder under test, and d is the rotary encoder under test during one rotation. The value is twice the count value of the rising and falling pulses of the encoder output pulse, e is the rising and falling pulse waveform of the reference rotary encoder output pulse, f is the count value during one rotation, and g is the subtraction of each value. The value h is the waveform of the subtracted value on the XY monitor.

If the rotary encoder under test has a pulse pitch error, that is, in Fig. 3a, 3/4T
If there is an error of X-
The change in the value of the X axis of the Y monitor becomes large.

(3) Effects of the Invention As described above, according to the present invention, the pulse pitch error of the rotary encoder is
It is expressed as a variation value in the axial direction, and inspection can be performed in a short time and with good workability while rotating.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
Figures a to i are waveform diagrams of various parts when the pulse pitch of the rotary encoder to be inspected is normal, and Figure 3 a to h
These are waveform diagrams of various parts when the pulse pitch of the rotary encoder to be inspected is abnormal (deviated by 3/4T). DESCRIPTION OF SYMBOLS 1...Rotary encoder to be inspected, 2...Reference rotary encoder, 4-7...Circuit for calculating the difference between measured values, 8, 9...A-D conversion circuit, 10...
…monitor.

Claims (1)

[Claims] 1. A reference rotary encoder that is installed on the same axis as the rotary encoder to be inspected and has a number of pulses in one rotation that is n times the number of pulses in one rotation of the rotary encoder to be inspected, and a rotary encoder to be inspected when these encoders rotate simultaneously. A circuit that measures the number of rising and falling pulses of the output of a rotary encoder, multiplies it by n, and converts the difference between the measured value of the number of rising and falling pulses of the output of a reference rotary encoder into an analog value, and a reference rotary encoder. A circuit that converts the number of output pulses into an analog value, a circuit that clears each of the above measured values using the origin signal of the reference rotary encoder, and a circuit that displays each of the above analog values.
A rotary encoder inspection device characterized by comprising a Y monitor.