JP3403650B2 - Displacement measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a displacement measuring device, and more particularly to a displacement detector using a counter that performs a counting process based on a detector output.

[0002]

2. Description of the Related Art In displacement measuring instruments such as linear gauges and linear scales, tolerance determination result output and BCD output format have been widely used as data formats used when a sequencer or the like is connected to the counter output side. There is. In addition, as a recent user request, it is often required to connect the counter and a sequencer arranged on the output side thereof with reduced wiring to output data capable of multistage selection.

[0003]

However, the tolerance judgment output of such a displacement measuring device is only the final result, and there is a problem that the setting of the tolerance value becomes complicated in order to carry out multistage selection. In addition, for BCD output, at least 24 signal lines are required even for 6 digits (for example, a widely used range of 999 mm with a resolution of 1 μm) for one gauge, and especially in the case of multistage measurement, the wiring becomes complicated. There was a problem.

[0004]

In order to solve such a problem , a detector input means for inputting the output of the detector for conversion, and a count value obtained by counting the output of the detector input means.
A counting processing unit for outputting a zero resetting said count value
The origin setting means and the divided counting areas that have been set
On the other hand, the area to which the count value belongs is judged to determine the division meter.
Counting area determining means for outputting a plurality of domain signals every few regions, the displacement measuring instrument having a plurality of count region output means for individually externally outputting the plurality of regions signal, the counted <br/> speed region determining means, with respect to the counted value specific division count region, "match", "above", at least one determination process performed, the counting area determining means from among the "less", the division count region displacement measuring instrument and outputting at least one of said plurality of count region output means corresponding to is provided. Further, wired connection means is the arrangement on the output side of the counting area output unit, by connecting to each other by a wired these wired connection means, easy to combine multiple coefficient domain output arbitrarily A displacement measuring device is provided.

With such a configuration, the counting result can be known only by determining which area of the predetermined divided counting area is present, instead of reading the counting result numerically, and the counting area can be known. The configuration of the output side of the output means can be simplified. As a result, it is possible to easily meet the user's request with simple processing. The present invention will be described below with reference to embodiments of the invention.

[0006]

1 shows an embodiment of a displacement measuring device according to the present invention, in which the output of a detector 1 is sent to a detector input means 21 constituting a counter 2. , Where the level of the output of the detector 1 is converted to A // in order to convert it into a signal suitable for processing in the counter 2.
Performs D conversion and the like.

The counter 2 includes, in addition to the detector input means 21 described above, a counting processing means 22 connected to the subsequent stage of the detector input means 21, an origin setting means 23 connected to the counting processing means 22, and a counting operation. Counting area determination means 24 connected to the output side of the processing means 22 and a plurality of counting area output means 251 @ 25 connected to the output side of the counting area determination means 24
It is composed of n etc.

The counting processing means 22 has a function of performing counting processing. For example, in the case of an incremental encoder, the counting processing such as integration processing is performed and the current count value is output, and in the case of an absolute encoder, the offset processing is performed. Processing is performed and the current count value is output. Further, the origin setting means 23 has a function of resetting the count value of the counting processing means 22 to zero.

The counting area judging means 24 judges to which area the current count value output from the counting processing means 22 belongs to the plurality of divided counting areas set by the counting area setting means 28. The contents of this judgment are 1) which specific area the current count value "matches", 2) which specific area the current count value is "above", and 3) which specific area the current count value is "below". Or at least one of the three types. The counting area setting means 28 also sets the counting range as a counter.

In the divided counting area, the counting range set by the counting area setting means 28 (of course, the entire counting range may be the target) is divided into n divisions, for example, 21 divisions evenly or unevenly. Specifically, ±
10 μm is equally divided into 21 regions to set a region for each 1 μm. When the “match” determination is made when the current count value is +5 μm, for example, a +5 μm region signal is output. When judging "above", -10 to + 5μm
All signals in 16 areas up to m are output. Further, in the case of making the “below” determination, all the signals in the 6 regions from +5 μm to +10 μm are output.

At this time, +10 μm or more or −10
+10 μm or −10 μm for counts less than μm
The area output of can be output or not output.

In this way, the counting area judging means 24
The signal is supplied to the count area output means 251 to 25n, which corresponds to the number of divided count areas described above and is supplied with a signal when the count value is assigned to the area. Then, the outputs of these counting area output means 251 to 25n are sent to the outside (for example, a sequencer (not shown) arranged in the subsequent stage).

With such a configuration, the counting result can be known only by determining which area of the predetermined divided counting area is present, instead of reading the counting result numerically, and moreover, the counting area. The configuration of the output side of the output means can be simplified. As a result, it is possible to easily meet the user's request with simple processing. As a result, it is possible to determine in which area the counting result is not read numerically.

FIG. 2 shows another embodiment of FIG. 1 and shows only a portion different from FIG. In FIG. 2, the output format of the counting area output means 251 @ 25n is such that the output of the relay contact output or the output of the open collector of the transistor can be yard or OR. For example, in the example of the embodiment divided into 21 in FIG.
Output signals of 0 to +6 μm, +5 to -5 μm, and -6 to -10 μm are connected by a yard or
It can be combined into three outputs of 1,02,03.

In such a configuration, when the counting area judging means 24 is caused to make a "match" judgment, the count value becomes ± 10 μm.
If it is within m, the above-mentioned three output signals O1, O
Either of the two or O3 will be output. That is, when the output corresponding to the count value of +10 μm to +6 μm is sent from the count area output means 251 @ 25 5, +
NG, OK when the output corresponding to the count value of +5 to -5 μm is sent from the count area output means 256 to 2516,
When the output corresponding to the count value of −6 to −10 μm is sent from the count area output means 2517 to 2521, −NG is given.
Can be

Since the wired OR of the output of any counting area is possible, it is possible to take out the tolerance signal of any number of stages only by wired ORing the output signal outside the counter 2 in this way. Such a configuration can be used not only for the tolerance determination but also for simple positioning control of the machine.

FIG. 3 shows another embodiment of the present invention, in which the same elements as those in FIG. 1 or elements having the same function are designated by the same reference numerals. In the figure, the difference from FIG. 1 is that the count value itself which is the output of the count processing means 22 can be output by using a plurality of count area output means 251 @ 25 n. The output switching means 26 switches whether to output the count value itself or the output of the counting area determination means.

The count values output from the count area output means 251 to 25n can be in binary or BCD format. In the case of BCD, for example, when outputting "6 digits + code", 25 counts are output. Area output means is required.

FIG. 4 shows still another embodiment of the present invention, in which two detectors and counters shown in FIG. 1 are connected in parallel. In this case, the added detector and counter are shown with the suffix "A" added to the reference numerals used so far. Of course, the number of parallel connections may be three or more.

In this way, the detectors and the counters are arranged in parallel, and the outputs of the corresponding counting area means of the counters 2 and 2A are connected by the wired OR connection. When the “below” determination is made, the maximum value or the minimum value of a plurality of counters can be easily known. For example, when the count value of the counter 2 is 5 [mu] m, and is subjected to counting "or more" in the area determination means 24 determines the output of the count region output unit 25 _{6-25 21} are all turned on. The next time the count value of the counter 2A is 7 [mu] m, and is subjected to "or" determined in the counting area determining means 24A, count region output unit ₂₅ 4 _{A~25 21}
All outputs of A are turned on. Here, the counting area output means 25 _{1 to} 25 ₂₁ are respectively the counting area output means 2
As a result of being wired-OR connected to 5 _{1 to} 25 ₂₁ A, as a result, the outputs 1 to 3 are turned off and the outputs 4 to 21 are all turned on. This is counter 2
The maximum value (here, 7 μm) is output for each of the counting results of the counter 2A and the counter 2A.

FIG. 5 shows still another embodiment of the present invention. Up to the detector 1, the detector input means 21, and the counting processing means 22, the same configuration as that shown in FIG. In this example, 6 lines are used. The same parts as those in the above-mentioned embodiments are indicated by using the same reference numerals and suffixes "1" to "6". Further, the outputs of the counting processing means 1 to 6 are supplied to the inter-axis computing means 27, and the output thereof is the counting area judging means 24 having the same configuration as that of the embodiment of FIG.
Is output to.

The inter-axis arithmetic means 27 is for performing arithmetic operations on the outputs of a plurality of counting processing means, and in this example, 6
The output from each of the calculation processing means 221 @ 226 is supplied. The arithmetic processing performed by the inter-axis arithmetic means 27 includes general numerical arithmetic operations such as addition, subtraction, multiplication, and division, and statistical arithmetic operations such as maximum, minimum, average, and width (maximum value-minimum value). .

The counting area judging means 24 judges which area the current count value belongs to among a plurality of predetermined divided counting areas. The contents of this determination are: 1) which specific area the current count value (result of the inter-axis calculation means) "matches", and 2) which specific area the current count value (inter-axis calculation result) "is above" 3) It is at least one of three types of which specific area “or less” the current count value (inter-axis calculation result) is.

In the divided counting area, a specific counting range (of course, the entire counting range may be the target) is divided into n areas, for example, 21 areas are evenly or unevenly divided. Specifically, ± 10 μm is divided into 21 to set a region for each 1 μm. When the current count value is, for example, +5 μm, a “match” determination is made, a +5 μm region signal is output. In case of “above” judgment, from −10 μm to +
All signals in 16 areas up to 5 μm are output. Also,
+5 μm to +10 μm when making “below” judgment
All signals in the 6 areas up to are output.

At this time, +10 μm or more or −10
+10 μm or −10 μm for counts less than μm
It is possible or not to output the area output of.

The area signal thus output is input to the counting area output means and externally output. This makes it possible to easily determine in which area the result of the inter-axis calculation means is not read numerically.

FIG. 6 shows still another embodiment of the present invention, in which the output switching means 26 (the same as FIG. 3) is provided in the example of FIG. That is, the numerical value itself, which is the output of the inter-axis calculation means 27, can be output by utilizing the plurality of counting area output means 25 _{1 to} 25 _n . Or a number which is the output of the shaft between the calculating unit 27 and the output of the counter 2, or, whether the output of the counting area determining means 24 and the output of the counter 2, is switched by the output switching unit 26. Counting area output means 25 _{1 to} 25 _n
The numerical value output from can be in binary or BCD format.

[0028]

As described above, by using the displacement measuring device according to the present invention, tolerance judgment and the like can be easily performed. In particular, by connecting the output of the counting area output means to the outside of the counter in a wired OR manner, it is possible to take out the tolerance signal of an arbitrary number of stages, so that it becomes easy to change the required number of tolerance stages according to the measurement work. Such a configuration can be used not only for the tolerance determination but also for simple positioning control of the machine.

Further, the tolerance calculation between the counter count values of a plurality of systems can be easily performed simply by wired OR connection, and by providing the inter-axis calculation means in the counter, general numerical calculation and statistical calculation can be performed. As a result, there is no need to install a personal computer for calculation outside, and low cost, high functionality, and flexibility are improved. Therefore,
The present invention is effective when applied to linear gauges, linear scales, and the like.

[Brief description of drawings]

FIG. 1 is a block system diagram showing an embodiment of a displacement measuring device according to the present invention.

FIG. 2 is a main part system diagram showing another embodiment of the present invention.

FIG. 3 is a block system diagram showing another embodiment of the present invention.

FIG. 4 is a block system diagram showing still another embodiment of the present invention.

FIG. 5 is a block system diagram showing still another embodiment of the present invention.

FIG. 6 is a block system diagram showing still another embodiment of the present invention.

[Explanation of symbols]

1, 1A, 11 to 16 ..... detector, 2, 2A ..... counter, 21, 21A, 211 to 216 ... detector input means, 22 , 22A, 221-226 ... Counting processing means, 23, 23A ... Origin setting means, 24, 24A ... Counting area judging means, 251- 25n: Counting area output means 26: Output switching means 27: ... Axis calculation means.

─────────────────────────────────────────────────── ─── Continued Front Page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01D 5/00-5/62 G01B 7/00-7/34 G01B 11/00-11/30 G01P 1 / 00-3/80

Claims (7)

(57) [Claims] 1. A detector input means for inputting and converting an output of a detector, and an output of the detector input means is counted and measured.
Count processing means for outputting a numerical value and a zero reset for the count value.
Origin setting means to set
Determine the area to which the count value belongs to the area
In a displacement measuring instrument having a counting area determination means for outputting a plurality of area signals for each divided counting area, and a plurality of counting area output means for individually outputting the plurality of area signals to the outside , the counting area determination means, At least one determination process is performed for the count value to match a specific divided count area, whether or not the number is equal to or more than the following, and the count area determination means is a plurality of count area output means at least equal to the number of the divided count areas. Each of the above
A displacement measuring device characterized by outputting a region signal . 2. A displacement measuring instrument according to claim 1, wherein a wired OR connecting means is arranged on the output side of at least one of the counting area outputting means. Wherein the output of the counted value, the displacement measuring instrument according to claim 1, characterized in that it has an output switching means for outputting the count region output means. 4. Detector input means for inputting and converting the output of the detector, and counting and counting the output of the detector input means.
Count processing means for outputting a numerical value and a zero reset for the count value.
Origin setting means to set
Determine the area to which the count value belongs to the area
A plurality counting area determining means for outputting a plurality of domain signals for each split count region, the system comprising a plurality of count region output means for individually externally outputting the plurality of regions signal, said corresponding of each system provided <br/> Wa Lee Yadooa connection means to the output side of the count region output means the count for each said line
Displacement measuring device characterized by outputting the maximum value or the minimum value of the numerical values . 5. Inputting the output of each of a plurality of detectors
A plurality of detector input means for converting Te, the plurality of detection
Counts each output of the instrument input means and outputs the count value
From the plurality of counting processing means ,
Between axes I arithmetic processing line between the count value of the output their respective
Inter-axis calculation means that outputs the calculation result, and the set multiple
Area to which the calculation result between axes belongs to the divided counting area
And outputs a plurality of area signals for each of the divided counting areas.
Counting area determining means for, individually the plurality of areas signals
A displacement measuring instrument, comprising: a plurality of counting area output means for external output . 6. The displacement measuring instrument according to claim 5, wherein a wired OR connecting means is disposed on the output side of at least one of the counting area output means. 7. is an output of the inter-axis operation means between said shaft
6. The displacement measuring device according to claim 5, further comprising an output switching means for sending the output of the calculation result to the counting area output means.