JPS5815114A - Detector using pulse encoder - Google Patents

Abstract

PURPOSE:To make the detection of the rotating angles of crank shafts in mechanical presses, etc. and the positions in hydraulic presses, etc. common by permitting the change in counting systems of a counting means that counts the output pulses of a pulse encoder. CONSTITUTION:The 1st and 2nd output pulse signals 3, 5 of a pulse encoder 1 are subjected to waveform shaping 21 then to decision 27 of the rotating direction of the encoder 1 and are counted with a reversible counter 29. The counter 29 is set of counting systems by the switching signal 31 from a control part 15. A computer part 13 calculates rotating angles and positions from the latched 9 count signal 11'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device for a press, and is a common device for detecting the rotation angle of a crankshaft at -18 in a mechanical press, etc., and the position of a table, work feed, gauge, etc. in a hydraulic press, etc. Detection device using a converted pulse encoder! Regarding.

Conventionally, in mechanical presses, etc., in order to detect the rotation angle of a crankshaft, a pulse encoder is used that outputs the rotation angle as a co-res signal.For example, when detecting the rotation angle in units of 1 degree, a pulse encoder is used. The detection device was constructed using a 3604 reversible counter as a counter for counting the pulse signals.

On the other hand, in hydraulic presses, for example, to detect the position of the slide, table, work feed, gauge, etc.
In addition to devices using pulse encoders, various types of detection devices were used.

When a pulse encoder is used in the position detection device in the hydraulic press, etc., the counter for counting the pulse signals is different from the counter for detecting the rotation angle of the crankshaft, and the position detection device is used as the counter for counting the pulse signals. If a system other than a pulse encoder is used, a device must be designed and manufactured completely separately from the crankshaft rotation angle detection device, which is time-consuming and increases the cost of the machine! As a result, there has been a demand for a common device for detecting the rotation angle and position of the crankshaft.

This invention was made in view of the above, and its purpose is to provide a common device for detecting the rotation angle of the crankshaft in mechanical presses, etc., and the position of the table, work feed, gauge, etc. in hydraulic presses, etc. An object of the present invention is to provide a detection device using a pulse encoder that has been converted into a pulse encoder. In order to achieve the above object, a pulse encoder, a counting means capable of changing the counting method of pulses outputted from the pulse encoder, and a latch section that latches a counting signal indicating a counted value of pulses from the counting means are provided. , a computer section that performs processing based on the latched count signal from the counting means, and a control section that controls the latch section and the counting means, and the counting method of the counter can be changed depending on the purpose of detection. The gist is that the structure is as follows.

The 'A11FA example of the present invention will be explained below using the following factors.

FIG. 1 shows an embodiment of the present invention, in which numeral 1 denotes a pulse encoder, such as a tally encoder, which outputs first and second pulse signals 3 and 5, which have different phases depending on the direction of rotation. 7 is a counting means for inputting the first and second pulse signals 3 and 5 output from the pulse encoder 1 and counting the pulses; 9 is a counting means for counting the pulses by the counting means 7; A latch unit latches a count signal 11 indicating a count value; 13 is a computer unit that performs processing based on the count signal 11' latched by the wrinkle latch unit 9; 15 is a computer unit 13;
The counting means 7 receives the latch command signal I7 from
and a control section that controls the latch section 9.

The counting means 7 includes a waveform shaping section 21 that performs waveform shaping of the first and second pulse signals 3 and 50 inputted from the pulse encoder 1, and a waveform shaping section 21 that determines the rotation direction of the pulse encoder 1 with respect to the waveform shaped signals. , U during forward rotation
P (j number 23, a determination unit 27 that outputs a DOWN signal 25 when the reverse is in progress, and the UP signal 23 or the DOWN signal 25 as input, counts up when the UP signal 23 is applied, and applies the DOWN signal 25. A reversible counter 29 (hereinafter referred to as rate K) counts down when
counter). In addition, the above counter 2
9 selects the counting method from the switching signal 3 from the control section 15.
1, when the pulse encoder l is attached to a mechanical press or the like and used to detect the rotation angle of the crankshaft, it is, for example, 360K, and when it is attached to a hydraulic press or the like and used to detect the position, for example, Switched to 512 base. Further, the determination section 27 determines whether the pulse encoder 1 rotates forward or reverse, for example, by comparing the phases of the first and second pulse signals 3 and 5 of the pulse encoder 1.
Normal rotation is when the second pulse signal 5 is delayed in phase with respect to pulse signal 3 of $2, and reverse rotation is when the phase of pulse signal 50 of $2 is ahead (see FIG. 2).

The computer s13 inputs the count signal 11' latched by the latch unit 9 to an input port 33, and inputs the count signal 11' input from the input port 31 and indicates the count value of pulses read via the data bus 35. It has a CPU 37 that performs processing such as various calculations based on the CPU 37, and an output port 39 that outputs a launch command 17 having a predetermined period, which is one of the processing results of the #Cpu 37.

The control unit 15 inputs the latch command 17 and a signal from the changeover switch 19 for setting the counting method of the counter 29 to either one for detecting the rotation angle of the crankshaft or for detecting the position, and inputs the latch command 17 to the latch 811S9. The counter 29 is supplied with a signal 41, a switching signal 31 for setting a counting method, and a clear signal 43 for clearing the counter 29.

FIG. 2 is a time chart showing a processing example in the determination 927, in which (A) jd and (B) are the first and second pulse signals 3 and 5 output from the pulse encoder 1, respectively, <cI is UP signal 23, (b) is DO
A WN signal 25 is shown. In addition, UP signal 23G'! , 1st
The pulse signal 3 is at the Heilepel (■) and is output at the rising edge of the second pulse signal 5, and the DOWN signal 25 is
The first pulse signal 3 is at a low level (L) K and is output at the rising edge of the second pulse signal 5.

FIG. 3 is an example of a time chart for detecting the rotation angle of the crankshaft, and the counter 29 is set to count, for example, at 360 degrees.

In the figure, (4) ~ (Shun is the body in Figure 2) ~ (2
), and (9) is the count signal 11 indicating the pulse count value. A count signal 11' indicating a numerical value (6) indicates a read signal of the count signal 11' of the CPU 37.

Figure 4 is an example of a time chart for position detection.
The counter 29 is set, for example, to count in 512 decimal notation @II, where (I) is the clear signal 43, (-
indicates a signal indicating the position detection data calculated by the CPU 37, and the signal waveform of (Al - (Hl) is the same as (4) to (6) in FIG. 3.

The operation of this embodiment will be described below along with the drawings described above.

First, in a mechanical press or the like, if a pulse encoder l is installed to output pulses at a rate of 1 pulse/degree as the crankshaft rotates, in order to detect the rotation angle of the crankshaft, The counting method of counter 29 is set to 3.
604. Therefore, the number of pulses output from the pulse encoder 1 is counted by the counting means 7, and the counting signal 11 (see FIG. Count signal 11 latched with
' (see FIG. 3(G)), the CPU 37 can detect the rotation angle.

It should be noted that the installation of the pulse encoder l for detecting the rotation angle of the crankshaft does not necessarily have to be limited to 1 pulse/degree, but the counter 29 can be installed at an integer multiple or an integer fraction of 360 decimal depending on the resolution of the pulse encoder l. may be configured.

Next, when detecting the position of a table, work feed, gauge, etc. of a hydraulic press, etc., the counting system of the counter 29 is in 360 decimal notation, so the changeover switch 19 sets the counter 29 to 512 decimal notation. At that time, the output of the count signal 11 of the counter 29 is a binary coded 9 bit, and the upper one bit is set as the sign bit.
capable of counting pulses from 56 to +255;
Then, as the movable parts such as the table, work feed, and gauge move, pulses are output from the clock engager 1, and the pulses are counted by the counter 29 (see Fig. 4 (g)). , the count signal 11 is latched at a predetermined period (see FIG. 4, 01). Then, in order to count the next pulse, the control s15 supplies a clear signal to the counter 29, and after clearing its output, the CP
u37 reads the latched count signal 11' and performs calculations to calculate the position of the movable object (see No. 411 (J)). Note that the latch command 170
The number of pulses that can be counted by the counter 29 within a period must be within -256 to +255, and this is related to the speed FIK of the movable object, such as the latch command 17.
If the period of is 0.01 seconds and the output of the pulse signal from pulse encoder 1 is 1 pulse 10, 1 m, the maximum allowable speed of the movable object is, and this speed is a sufficient value for practical use. I can say that. In addition, a counter 2 for position detection
It is not necessary to limit the counting method of 9 to 512 decimals (by increasing the number of output signals of the counter 29, a binary counter can be constructed. can be done.

Therefore, according to the above embodiment, the counting method of the counter that counts the pulses from the pulse encoder can be switched between 360 base and 512 base depending on the detection purpose, so that the rotation angle of the crankshaft, the gauge, and the workpiece can be changed. sending,
The position of the table, etc. can be detected using the same hardware.

Since the present invention is configured within the scope of the @I'F M requirement, it is possible to use a common device for detecting the rotation angle of the crankshaft in a maple mechanical press or the like and the position in a hydraulic press or the like.

Note that the present invention is not limited to the above-mentioned embodiments, and may be implemented in other embodiments depending on the circumstances.

[Brief explanation of drawings]

FIG. 1 shows a block diagram showing the configuration of an embodiment of this invention.
Figure 2 is a time chart showing the operation of the determination section. Figure J3 is a time chart when one rotation angle of the crankshaft is detected in the embodiment of this invention, and Figure 4 is a time chart when the position of the table, work feed, gauge, etc. is detected in the embodiment of this invention. Show yards. (Explanation of the symbols representing the main wall part of @) 1-axis pulse encoder 3.5-first pulse signal, second pulse signal 7...
Counting means 11, 11'... counting signal 9...
Latch section 13--Computer section patent applicant
Amada J9 Co., Ltd. Figure 3 (H) Figure 4

Claims (1)

[Claims] a pulse encoder, a stitch number means capable of changing the counting method of pulses output from the pulse encoder, a latch section for latching a count signal indicating a count value of the pulses from the counting means, and the latched count. 1. A detection device using a pulse encoder, comprising a computer section that performs processing based on a signal, and a control section that controls the latch section and counting means.