JP2939029B2 - Measuring device with set value detection function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring apparatus having a set value detecting function, which is configured to set a desired value in a measuring system, and to detect a set value at the time of measurement and to report the fact. About. In particular, the present invention relates to a measurement device with a set value detection function that can easily determine the relationship between the current measured value and the set value when the relationship between the current measured value and the set value becomes unclear due to interruption of measurement or the like.

[0002]

2. Description of the Related Art A conventional measuring apparatus 1a having a set value detecting function.
Is the measured value from the measuring means 2a, as shown in FIG.
Set value V held in desired value setting means 3a₁a, V_Two
a, V 3a,..., Vna are each set to n comparators
4₁a, 4_Twoa, 4_Threea ... 4na and compare them
Exclude the section where the result of changes from small to large or large to small
Element of logical OR circuit 11₀a, 11₁a, 11_Twoa ... 11
The configuration is obtained by na. Set value detection function
With this configuration, the measuring device 1a with the current measurement value and the set value
When the magnitude relationship of
Knows that it is in the only section made up of
Is to continue. Note that V_LIndicates that the set value is a measured value
Element 11 of the exclusive OR circuit₀Enter a
Force, V_HIs larger than the measured value
Is input to the element 11na of the exclusive OR circuit.
It is.

[0003] Another conventional measuring device 1 with a set value detecting function.
b comprises a desired value setting means 3b, a comparator 4b and a control means 8b, as shown in FIG.
Calls the set value from the desired value setting means 3b and sends one to each of the comparators 4b for comparison with the measured value of the measuring means 2b. The set value whose comparison result changes from positive to negative or from negative to positive A measuring device 1b with a set value detection function configured to be found is conceivable.

[0004]

[SUMMARY OF THE INVENTION] In the setting value detecting function measuring apparatus constant 1a, n pieces of comparator - data 4 ₁ a, 4 ₂ a,
4 requires ₃ a ... 4NA and (n + 1) pieces of exclusive elements of OR circuit _{11 0 a, 11 1 a,} 11 2 a ... 11na,
There is a problem that the number of parts is large, the assembly is complicated, and the manufacturing cost is high. In particular, as a practical problem, the number n of the set values is not determined in the configuration in which the measuring apparatus 1a with the set value detection function has versatility, and it is not clear how many comparison systems should be provided. Therefore, the number of set values n
Considering a relatively large number of devices, if the number of comparators and exclusive OR circuit elements is made corresponding to the number, the manufacturing cost increases and the whole device becomes large, and unnecessary comparisons are made. The system was not used and the problem was more serious.

On the other hand, a measuring device 1b with a set value detecting function
Can reduce manufacturing costs, but has the problem that it takes a lot of processing time to compare measured values with set values one by one. As described above, the control has a problem that the control means 8b has a complicated configuration. The present invention has been made in view of the above circumstances, and when a value set at the time of measurement is detected, this fact is reported, and when the relationship between the current measured value and the set value becomes unknown, the relationship is found. The cost can be reduced by reducing the number of parts, the processing time is short without much time for comparing the set value and the measured value, and the configuration of the control means used is simple. A measurement device with a value detection function is provided.

The present invention includes two comparison systems for comparing a measured value and two consecutive set values, and has a configuration in which two set values related to the comparison can be selectively called. , A first multiplexer and a second multiplexer interposed between the desired value setting means and the first comparator and the second comparator, respectively, and the control means separates the first multiplexer and the second multiplexer from the first multiplexer and the second multiplexer, respectively. This is a measuring device with a setting value detection function configured to selectively send two continuous setting values to the first comparator and the second comparator. The more detailed configuration depends on the measuring means and the desired
Desired value setting means for setting the value of
A first value and a second value for comparing a value with a set value of a desired value setting unit;
The comparator and the current measured value of the measuring means are set to the desired value setting means.
Is detected to be equal to the set value of
The two consecutive setting values from the value setting means are
To the comparators one by one,
Each comparison, the measured value is outside between the two set values
In such a case, sandwich the measured value between two consecutive set values.
The desired value setting means to each of the two comparators
Retrieves continuous set values one by one and intermittently sandwiches measured values
Control means for controlling the two set values to be determined.
A desired value setting means, and a first comparator.
Between the first comparator and the second comparator, respectively.
A multiplexer and a second multiplexer are interposed, and
The first multiplexers are linked to the first comparator.
One of the following two setting values is assigned by the second multiplexer.
The other of the two consecutive set values is output to the second comparator.
The control means sends a signal for selectively transmitting each signal to the first mark.
Output to the multiplexer and the second multiplexer.
Measurement with set value detection function characterized by
Device.

[0007]

The two consecutive set values from the desired value setting means are selectively sent to the two comparators by the control means and the two multiplexers, where they are compared with the measuring device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. However, the present invention is not limited by the embodiment. Measuring device 1 with set value detection function
Is a measuring means 2 and a desired value setting means 3 as shown in FIG.
And comparators 4 and 5, multiplexers 6 and 7,
Control means 8 and processing means 9 are provided. The measuring means 2 includes a main scale (not shown) and an index scale (not shown), and when the processing means 9 and the workpiece 10 move relative to each other, the distance (length) of the relative movement.
Is measured.

The desired value setting means 3 is for setting a desired value within the measurement range of the measuring means 2.
That is, when the processing means 9 and the workpiece 10 take a specific relative position, the processing means 9 is operated to perform processing on the workpiece 10, the relative position is set, and When the relative position set during the relative movement with the workpiece 10 is obtained, this is detected.
The comparator 4 compares the measured value of the measuring means 2 with the value from the multiplexer 6, and the comparator 5 compares the measured value of the measuring means 2 with the value from the multiplexer 6, and sends the result to the control means 8. What to send. The multiplexers 6 and 7 both receive signals S ₁ , S ₂ , S ₃ ,... Sn indicating n set values from the desired value setting means 3 and selectively output these signals to the comparators 4 and 5 respectively. To send to.

When the current measured value obtained by the measuring means 2 and the value set in the desired value setting means 3 become equal, the control means 8
This is to detect that. Further, it controls the processing means 9. The control means 8 is further adapted to easily obtain the unknown positional relationship when the relationship between the current relative position and the set value becomes unclear due to interruption or the like during the relative movement between the processing means 9 and the workpiece 10. It is. That is, if the relationship set value as the current relative position (current measured value of the measuring means 2) is unknown, the control unit 8, the comparator 4 the signal S _i corresponding to the set value V _i which is continuous from the multiplexer 6, set The control signal is sent to the multiplexers 6 and 7 so that the signal S _{i + 1} corresponding to the value V _{i + 1} is selected and output from the multiplexer 7 to the comparator 5. Here, in the comparison result of the comparator 4 and 5, the measurement values are two set values V _i of the measuring unit 2, and if it is outside between the V _{i + 1,} the measured values in two settings successive The comparator 4 has the set value Vi _{+ 2} , the comparator 5 has the set value Vi _{+ 1} , the comparator 4 has the set value Vi _{+ 2} , and the comparator 5 has the set value Vi _{+ 3.} To
The control means 8 further sends control signals to the multiplexers 6 and 7 to select signals corresponding to two consecutive set values and output the signals to the comparators 4 and 5 one by one. In addition, the control means 8 grasps the magnitude relation between the set value and the measured value, and when the value reaches the value set at the time of measurement, notifies the processing means 9 by a signal to that effect.

The processing means 9 is means for processing the workpiece 10 and performs relative movement with the workpiece 10, and the relative movement is measured by the measuring means 2. The measuring device 1 with a set value detection function is configured as described above. When the measuring device 1 with the set value detecting function is operated, the control means 8 calls and compares the value set in the desired value setting means 3 with the current measured value from the measuring means 2,
When the current measurement value reaches a certain set value, the control means 8 sends a signal for performing predetermined processing to the processing means 9. The processing means 9 receives the signal and performs predetermined processing on the workpiece 10.

When the processing means 9 and the workpiece 10 are relatively moved while the processing means 9 is processing the workpiece 10 at the relative position corresponding to the set value, the processing means 9 and the workpiece 10 relative positions, ie measuring means 2
When the position of the set value becomes unknown due to interruption of the relative movement or the like with respect to the current measured value, the control means 8 sends a signal to the multiplexer 6 and the multiplexer 7 so that the two consecutive set values are compared with the comparator 4 and the comparator. In this case, the current measurement value is set to a state where the current measurement value is sandwiched between the two successive set values, thereby obtaining the relationship between the current measurement value and the set value (see FIG. 2). ).

The control means 8 finds the set values for the measured values relating to the relative positions of the processing means 9 and the workpiece 10 by using the continuous two set values from the desired value setting means 3 in the multiplexers 6,7. Selector 4, depending on
5 and then compare it with the measured values. Therefore, the measuring apparatus 1 with the set value detecting function does not require a comparator and an exclusive OR circuit element corresponding to the number of set values, and can reduce the number of parts, thereby reducing the cost. Has been obtained. Also, by comparing a measured value between two set values, it is much more necessary to obtain the relationship between the set value and the current measured value than to compare the measured value with one set value. Processing time is shortened without requiring time. Further, the control means 8 calls the set values in cooperation with the multiplexers 6 and 7, as compared with the conventional case where the set values are selected one by one from the desired value setting means 3b and called out to the comparator 4b. With the configuration, the configuration of the control unit 8 is simplified. Even if the set value increases, it is possible to cope with the increase in the set value by providing the multiplexers 6 and 7 with a margin on the input side in advance. With the increase in the set value, the comparator and the exclusive logic are increased. There is no need to increase the number of elements in the sum circuit.

[0014] Incidentally, in the comparison of the two settings is continuous with the current measured value, the current measured value of the measuring means 2 comparator - motor 4 side set value V _i and comparator - of motor 5 side setting value V _{i + 1} If the outside between, comparator - motor 4 and at the set value V _{i + 2} comparators - motor 5 is set value V _i + _1, then comparator - data 4
Is the set value V _{i + 2} , the comparator 5 is the set value V _{i + 3} , and the comparator 4 is the set value V _{i + 4} and the comparator 5
The control means 8 is configured to selectively send a signal to the multiplexer 6 and the multiplexer 7 so as to change one of the values of the comparator 4 and the comparator 5, such as the set value Vi _{+ 3} ,. Because of this, the number of signals to be sent is smaller than when signals are sent to the multiplexers 6 and 7, respectively.

Here, the measuring device 1 with the set value detecting function obtains the relative position between the processing means 9 and the workpiece 10 based on the set value closest to the current measured value, and performs the processing corresponding to the relative position at that time. The control means issues a signal to the processing means 9 to cause the processing means 9 to perform predetermined processing so as to perform the processing on the workpiece 10. The processing means 9 resumes processing on the workpiece 10 at the position set by the desired value setting means 3.

In the measuring apparatus 1 with a set value detecting function, the measuring means 2 measures the moving distance of the relative movement between the processing means 9 and the workpiece 10, but in addition to this, the relative movement may be a rotational movement. For example, in the case of three-dimensional movement, measurement in three directions of so-called X direction, Y direction and Z direction may be mentioned. The processing by the processing means 9 specifically includes cutting, opening of a through hole, grinding, and the like. The processing means 9 may be composed of a single device such as a machining center, and may be a plurality of devices. May be used.

[0017]

According to the present invention, when a set desired value is detected during the measurement, the fact is notified, and the two measured values are compared with the current measured value and two consecutive set values. By providing a comparison system and making it possible to select and call two setting values related to comparison, it is possible to find out the relationship between the current measurement value and the setting value when it becomes unclear. Therefore, the cost can be reduced by reducing the number of parts, and the processing time is short without requiring much time for comparing the set value and the measured value, and the configuration of the control means to be used is simple to detect the set value. It is a measuring device with a function.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a main part of the embodiment shown in FIG. 1;

FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional technique.

FIG. 4 is a diagram corresponding to FIG. 1 showing another conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring apparatus with a setting value detection function 2 Measuring means 3 Desired value setting means 4, 5 Multiplexer 6, 7 Comparator 8 Control means

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G01B 7/00-7/34 G01B 21/00-21/30

Claims (1)

(57) [Claims] 1. A measuring means, a desired value setting means for setting a desired value for the measuring means, and first and second comparators for comparing a measured value obtained by the measuring means with a set value of the desired value setting means. And that the current measured value of the measuring means becomes equal to the set value of the desired value setting means. In addition, two continuous set values from the desired value setting means side are transferred to the two comparators. Call each one and compare it with the measured value of the measuring means.If the measured value is outside the two set values, sandwich the measured value between two consecutive set values,
A control means is provided for controlling so that successive setting values are called one by one from the desired value setting means to the two comparators, and two continuous setting values sandwiching the measured value are determined. A first multiplexer and a second multiplexer are interposed between the setting means and the first comparator and the second comparator, respectively, and the first multiplexer is connected to the first comparator. One of the two set values to be set is changed by the second multiplexer to the second comparator.
A setting value detection function, wherein the control means outputs a signal for selectively transmitting the other of the two continuous setting values to the first multiplexer and the second multiplexer. With measuring device.