JPS60178308A - Digital display type length measuring system - Google Patents

Abstract

PURPOSE:To avoid computation errors and to improve working efficiency, by directly processing the output data of a length measuring means by a data processing means including a table preparing device. CONSTITUTION:A digital display type length measuring system is composed of micrometers 1A and 1B as two length measuring means and a data processing device 2 as a data processing means, which sequentially receives the measured length data from the micrometers 1A and 1B and obtains the quality control data and the like from the received measured length data. The data processing device 2 obtains the quality control data such as average values and ranges from the output data from the micrometers 1A and 1B. On a printer 33 as a table preparing device, the sets of the data are displayed in the feeding direction of paper and the control data are displayed in the crossing direction with said feeding direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field J] The present invention relates to a digital display type length measurement system equipped with a quality control data creation function.

[Background Art] In general, so-called direct-reading length measuring devices such as calipers, micrometers, and dial gauges are used in all industrial fields.
In addition, there are also so-called digital display type length measuring devices, which have an optical or electrostatic encoder installed in the main body and can display the measurement results digitally on a digital display or CRT. It is becoming more and more popular.

Traditionally, with both direct reading and digital display types, inspectors record measurement results in notebooks, so in order to use this as quality control data, they must be calculated manually using a calculator or processed on a computer. was.

Therefore, in either case, the occurrence of calculation errors was inevitable to some extent, and the reliability of the calculation results was low.

Furthermore, in the former case, calculation errors occur, work efficiency is extremely low, and individual errors are particularly likely to occur among inspectors.

On the other hand, in the latter case, ■ input errors are likely to occur; ■ because it is a large computer that also performs other processes, the results cannot be checked near the actual product, and you have to wait until other processes are completed; ■ etc. On the other hand, there were many problems such as having to sacrifice other processing while processing quality control data.

As a solution to this problem, it is possible to integrate the calculation function and printer into a digital display measuring instrument, but this would make the measuring instrument itself large and make it difficult to measure the length of the object being measured. Become. In addition, the battery life of the power source is short, which makes it impractical, and furthermore, the functions that can be used are limited, and as a result, such a measuring device has not yet appeared.

[Object of the Invention] Here, the object of the present invention is to be able to calculate quality control data by inputting measurement value data as is without transcribing the measurement value data, and to create a control chart from this input data. It is an object of the present invention to provide a digital display type length measurement system that displays a data set in the sheet feeding direction of a tabulation device, taking into account the uncertainty of the data set and the number of samples when creating the data.

[Structure of the Invention] Therefore, the present invention provides an encoder that detects the amount of movement displacement of a spindle or the like that comes into contact with an object to be measured as an electrical signal, and a digital display that digitally displays the output signal from this encoder. A length measuring means including a length measuring means, an arithmetic circuit that records quality control data such as an average value ('5F) and a range (R or S) from the output data of this length measuring means, and a tabulation device having a control chart creation function. the tabulation device is configured to display a set of data in the paper feed direction and display management data in a direction orthogonal thereto to create a control chart; It is characterized by

[Example] FIG. 1 shows the appearance of a digital display type length measuring system according to this example. In this embodiment, the system sequentially imports the length measurement data measured by two micrometers IA and IB as length measuring means and the micrometers IA and IB. It is comprised of a data processing device 2 as a data processing means for generating quality control data and the like from the data. Here, each of the micrometers IA, 1B and the data processing device 2 are housed in separate housings, and are connected to each other via a signal transmission cable 3 so as to be able to exchange information.

Each of the micrometers IA and IB has a U-shaped frame 1.
1. The U-shaped frame 11 is provided with an anvil 12 at one end and a spindle 14 at the other end that moves forward and backward with respect to the anvil 12 by rotating the simple 13 and holds the object to be measured between them. U
A digital display 15 for digitally displaying the amount of displacement of the spindle 14, that is, the dimensions of the object to be measured, and various operation switches 16 are respectively disposed on the front side of the character-shaped frame 11 toward the spindle 14. Here, three types of operation switches 16 are provided: a power switch 16A, a zero clear switch 16B, and a hold switch 16C.

Further, inside the U-shaped frame 11, as shown in FIG. 2, there is an encoder 21 that detects the amount of displacement of the spindle 14 as an electric signal and displays it digitally on the digital display 15.

An output circuit 22 converts various signals from the encoder 21 into BCD coded signals and outputs the signals to the data processing device 2 through the signal transmission cable 3, and a battery supplies power to the encoder 21 when the power switch 16A is turned on. 11A29 and the like are respectively provided.

The encoder 21 includes a main scale 23 provided along the outer periphery of the spindle 14 in the longitudinal direction, an index scale 24 disposed opposite to the main scale 23, and irradiates light onto the main scale 23 through the index scale 24. The reflected light from the light emitting element 25 and the main scale 23 is reflected by the index scale 2.
A light receiving element 26 that receives light through 4, and this light receiving element 26
A signal processing circuit 27 that performs predetermined processing on the signal from the light receiving element 26, such as waveform shaping processing that shapes the sine wave signal received by the light receiving element 26 into a rectangular wave, division processing, direction discrimination processing, display unit conversion processing, etc.; a counter 2 that counts the output from the processing circuit 27 and displays the counted number, that is, the displacement amount of the spindle 14 on the digital display 15;
It consists of 8.

Further, the output circuit 22 outputs various information based on the operation of the encoder 21 and the operation switch 16.

That is, length measurement mode information, length measurement value information, code information, decimal point position information, and length measurement unit information are transmitted to the data processing device 2.
Convert to BCD code according to the data import command from
It is output via serial in synchronization with the clock pulse from the data processing device 2. The data is 13 digits d+ of l digit 4 bits, as shown in FIG.
-d'o, and 2 degrees of do in order from 2 degrees of d+.
Up to 3 bits are output in bit serial format. In terms of format, dI" d4 is the length measurement mode identification code that specifies the type of length measurement value, d5 is the code code that specifies the direction of increase/decrease of the length measurement value, and d6 to d11 are the length measurement values. , d12 are set to a decimal point position designation code for specifying the position of the decimal point to be added to the measured length value, and do is set to a unit and pass/fail determination code, respectively.

Here, the length measurement mode identification code is "in the case of normal length measurement values such as the micrometers IA, , IB".
'F F F
F" is set to "7" for the minimum hold value of a length measuring instrument with a minimum value hold function. In addition, the code code is set to "7" for the minimum hold value of a length measuring device with a minimum value hold function.
o”, and in the case of -, “8pa”. In addition, the decimal point position designation code is set to 0" to "5°" as the decimal point moves from the smallest digit of the measured length value to the higher digit. Furthermore, the unit and pass/fail judgment code are set in millimeters, It is set in inch units and in accordance with the pass/fail judgment data for each unit from 0°° to 7'°. For example, a normal measurement value of -210,768 (mm) is converted as shown in Figure 4 (A), and a normal measurement value of 2.0199 (inch) is converted as shown in Figure 4 (B). Ru.

On the other hand, as shown in FIG. 5, the data processing device 2 includes an input circuit 31 that receives signals transmitted via the signal transmission cable 3 from the output circuits 22 of the micrometers IA and IB, and An arithmetic circuit 32 that processes the data received by the circuit 31 according to a predetermined procedure and records quality control data, and a printer 33 as a tabulation device that prints and displays the data from the arithmetic circuit 32.
It also includes a digital display 34, a keyboard 35, and a control circuit 36 that operates the arithmetic circuit 32 according to a predetermined procedure based on commands from the keyboard 35.

As shown in FIG. 6, the keyboard 35 includes a measuring device selection switch 40 for selecting either the micrometer IA or IB, print selection keys 41 from "A" to rDJ, "x", "÷", " Arithmetic key 42 consisting of + and -
, a numeric keypad 43 from "0" to "9", and various function keys 44, as well as four print data display lamps 45A to 45D corresponding to each of the "A" to rDJ keys of the print selection key 41 and the Limit value setting display lamps 46 are provided corresponding to the rLIMIT J key of the function keys 44, respectively.

Here, when the rAJ key of the print selection keys 41 is pressed, the print data display lamp 45A is lit, and printing of the length measurement value data is excluded. Further, when the "B" key is pressed, the print data display lamp 45B is lit, and printing of statistical result data determined from the length measurement value data is excluded. Furthermore, when the rCJ key is pressed, the print data display lamp 45C is lit, and printing of histogram data created from length measurement value data is excluded. Furthermore, when the "D" key is pressed, the print data display lamp 45D lights up, and the print of the defective rate FRA determined from the length measurement value data, and the process capability index C1P data is excluded. There is. On the other hand, the function keys to 44 include an all clear key rAcJ and a preset key rP.
SETJ, initial key r INITJ, Rimi・
ENT key r LIMIT J, feed key r FEE
OJ, tabulation key r++c'', data import key rIIA
TAJ, print key rPRINT J, cancel key rCEJ, pass key r PASSJ, memory set key r MSETJ, load key r LOA
DJ, decimal point setting key “φ”, sign conversion key r
+/-" etc. are arranged respectively.

The control circuit 36 also includes the keyboard 35 inside.
A storage section 51 that stores setting data from the micrometers IA and IB, and length measurement value data transferred from each of the micrometers IA and IB.
, and after legally importing the length measurement data measured by the micrometers IA and IB according to commands from the keyboard 35, obtaining quality control data from the length measurement data according to a predetermined procedure, Print the result to printer 3.
It is configured to output to 3. The storage unit 51 stores the seventh rI! As shown in J, each micrometer A, 1B
Setting data storage area 52A, 52B, measurement value data storage area 53A, 53B, calculation data storage area 5
4A, 54B and control chart data storage areas 55A, 5
5B is allocated to each. Each of the setting data storage areas 52A and 52B contains the date, measurer number, part number, device number, sampling number N, first upper and lower limit values (usually upper and lower limits of allowable dimensions) HH, LL, and this first The second value is set within the allowable dimensions than the upper and lower limits HH and LL.
The upper and lower limits H and L, the number of divisions Nd that equally divides the range between the first upper and lower limits HH and LL, the division division Ndj equally divided by this number of divisions N-d, etc. are arbitrarily set and stored. It has become so. Further, length measurement value data from 1 to 1000 taken into the data processing device 2 from each micrometer IA and IB is sequentially stored in each length measurement value data storage area 53A, 53B. . Also,
Each calculation data storage area 54A, 54B stores the data number i of length measurement value data Di taken into the data processing device 2,
Frequency F for each division Ndj to which the length measurement value data Di belongs
In addition to j, the results calculated by the calculation circuit 32, for example, the average value data, runout R1 standard deviation S, D
, defective rate FR^, D, process capability index C0P, etc. are stored respectively. Further, each control chart data storage area 55A, 55B stores a set N of average value data xk and amplitude Rk determined by the arithmetic circuit 32.
They are marked with o and are transferred and stored sequentially.

Next, the operation of this embodiment will be explained. Before measurement, first perform setting work.In the setting work, first select either micrometer IA or
After selecting B, for example, micrometer 1-A, press the initial key r of the function keys 44 as shown in FIG.
INITJ, use the load key "LO^D", the decimal point setting key "・", and the numeric keypad 43 to input date data such as year, month, day, etc., and the numeric keypad 43 and the load key r LOAD.
Enter the measurer NO.1, part NO.1, device NO., and sampling number N using
rT” and the load key r LOADJ.
When the two upper and lower limit values HH, LL, H, L and the division number Nd for equally dividing the first upper and lower limit values HH, LL are input in sequence, those data are transferred to the control selected by the measuring device selection switch 40. Setting data storage area 52A of circuit 36
, and are sequentially printed out by the printer 33. At this time, after printing the number of divisions Nd, the value obtained by dividing the range of the first upper and lower limits HH, LLnn by the number of divisions Nd, that is, the class width of one division Ndj, is printed, and for each division Ndj. The range of is determined. Also,
By operating the limit key rLIMIT J, the limit value setting display lamp 46 is lit. Note that if the 1.2 upper and lower limit values HH, LL, H, and L are not set, it is possible to skip to the next operation by operating the pass key r PASSJ.

Next, use the print selection key 41 to specify data that does not need to be printed.In this case, to omit printing of measurement value data, press the rAJ key, to omit printing of statistical results, press the rBJ key, and press the histogram key. To omit the printing of rCJ -1--wo, defective rate FRA, D
To omit printing of the ability index c and p, use r[
Press the lJ key. At this time, when the "A" key is pressed, the print data display lamp 45A is pressed, and when the "B" key is pressed, the print data display lamp 45B is
” key is pressed, the print data display lamp 45C is pressed, and “DJ key is pressed, the print data display lamp 45C is pressed.
5D are lit respectively.

Therefore, it is possible to confirm what data will be omitted from printing based on the lighting conditions of these lamps.

Now, after the setting work is completed in this manner, when the power switch 16A of the micrometer IA is turned on, the data from the encoder 21, that is, the displacement amount of the spindle 14 is displayed on the digital display 15. Here, the operator operates the simple 13 to move the spindle 14 to a predetermined position, for example, to a position where it contacts the anvil 12, and then turns on the zero clear switch 16B, thereby setting the count number of the counter 28 to zero. After the object is cleared, the spindle 14 is moved according to the object to be measured.

When the spindle 14 moves, the sine -
The signal is detected by the light receiving element 26. The signal detected by the light receiving element 26 is subjected to predetermined processing by a signal processing circuit 27 and then counted by a counter 28. The count number of the counter 28 and the amount of movement of the spindle 14 from the backrest 12 are digitally displayed on the digital display 15 and are provided to the output circuit 22.

Now, when the spindle 14 is moved and the object to be measured is sandwiched between the anvil 12 and the spindle 14, when the data acquisition key rDATAJ of the data processing device 2 is pressed, the control circuit 36 performs the process shown in FIG. Processing is performed according to the flowchart. That is, when a data acquisition command is given from the control circuit 36 to the output circuit 22 of the micrometer IA, the output circuit 22 receives various information given from the encoder 21, that is, length measurement mode information, length measurement value information,
After the code information, decimal point position information, length measurement unit, and pass/fail determination information are converted into BCD coded signals, the data processing circuit 2
Transmitted via heavy serial. Then, in the data processing circuit 2, the length measurement value data Di transmitted from the output circuit 22 is taken in, and the data number i is counted up by +1, and then the data number i is added to the sampling number N by 1. It is determined whether the number (N+1) has been reached.

Here, the length measurement value data D taken into the data processing device 2
Until the data number i of i reaches (N+1), it is determined whether the length measurement value data Di belongs to any division Ndj of the allowable dimensions equally divided by the number of divisions Nd, and the length measurement value data Di After the frequency Fj corresponding to the division section Ndj to which belongs is counted up by +1, the first upper and lower limit value H
It is sequentially determined whether H, LL and second upper and lower limit values H, L are set.

Here, if the first upper and lower limit values HH, LL and the second upper and lower limit values H, L are both set, is the length measurement value data Di greater than the first upper limit value HH? , is smaller than the first lower limit value LL? , is it within a range that is less than or equal to the first upper limit value HH and greater than the second upper limit value H? , first lower limit L
Is the second lower limit value greater than or equal to L and within a smaller range? ,
are judged one after another, and depending on the judgment result, the
After the "ma" code is stored in the length measurement data storage area 53A in order, the process proceeds to print processing.
FIG. 10(A) shows the relationship between the determination area and the additional code. Furthermore, if only the first upper and lower limit values HH and LL are set, is the length measurement value data Di greater than the first upper limit value HH? , is smaller than the first lower limit value LL? , are judged sequentially, and depending on the judgment result, "mu" and "
Measured value data storage area 53A with “ma” code added.
After being stored in order, the process proceeds to print processing. FIG. 1O CB) shows the relationship between the determination area and the additional code. Note that if both the first and second upper and lower limit values HH and LL are not set, the process proceeds to print processing without making these determinations.

In the print process, the measurement value data Di is provided on the condition that the "A" key of the print selection key 41 is not turned on.
is printed. In other words, the r of the print selection key 41
If the AJ key is pressed, the length measurement value data Di is not printed. Incidentally, the length measurement value data Di is always displayed regardless of whether the print selection key 41 is on or off.

Now, in the process of sequentially importing the length measurement value data Di by operating the data import key r If you want to import the measured length data Di, first press the cancel key r CEJ,
While measuring new length measurement data Di with the micrometer IA, press the data capture key rDATAJ. Then, the next captured length measurement value data Di is updated and stored in the storage area of the previously captured length measurement value data Di. That is, the previous length measurement value data Di is rewritten to the next captured length measurement value data Di. Therefore, it is possible to rewrite erroneously captured data to normal data.

In this way, when the data number i of the length measurement value data Di taken into the data processing device 2 becomes equal to (N+1),
Quality control data is determined based on the length measurement data Di from i=1 to i=N.

Here, the (N+1)th captured length measurement value data D
The maximum value Dnax from among N length measurement value data excluding i
, minimum value [1w1n, amplitude R1 average value de, standard deviation S
In addition to D, defective rate FRA, capacity, and process capacity C1P are included. At this time, the average value M and the amplitude R are sequentially appended with No. and stored in the management data storage area 55A.

By the way, the swing width R is the maximum value D wax and the minimum value Dm
The difference between in and (Dmai - Dmin) can be claimed. It can also be determined by the average value or Moreover, the standard deviation SD can be calculated by: Also, the defective rate FR^.

D can be calculated from the quotient obtained by dividing the number of length measurement data obtained from the first upper limit values H'H, LL by the number of samplings N. Furthermore, the process capabilities C and P can be determined by:

Subsequently, after the maximum frequency F wam is determined among the frequencies Fj for each division Ndj, this maximum frequency F l1 is determined.
A quotient Fs is calculated by dividing ax by the number of printing digits n of the printer. Here, any 1 from among the integers greater than or equal to the quotient Fs
After one weighting coefficient Cn consisting of 2 numbers is selected, a respective quotient Qj is determined by dividing each frequency Fj by the selected weighting coefficient Cn, and the smallest integer Nj larger than these quotients Qj is determined. is determined.

After that, on the condition that the rBJ key of the print selection key 41 is not turned on, statistical result data (here,
The number of data i, the maximum value Dax, the minimum value Dmin, the amplitude R1 average value or the standard deviation SD) is the histogram data (here, the first upper Lower limit values HH, LL, number of divisions N, class width, histogram representing the integer Nj for each division Ndj as a bar graph, frequency Fj for each division Ndj), the "D" key is not turned on. Data such as defective rate FRA, D, process capacity C9P, etc. are printed under the conditions of . In other words, when the rBJ key is pressed, the statistical result data is displayed, when the "C" key is pressed, the histogram data is displayed, and when the "DJ main key is pressed, the defect rate FRA, D and process capability C1P
However, they are not printed. Thereafter, the length measurement data storage area 53A is cleared, and the (N+1)th captured length measurement data Di is stored in the length measurement data storage area 53A as f=1 data for the next step, and After setting j=1, it is printed.

On the other hand, if the print key rPRINT J is pressed at any time before the data number i of length measurement data taken into the data processing device 2 reaches N+1, statistical processing and histogram processing are performed as in FIG. It is done. Thereby, statistical processing and histogram processing can be performed at an intermediate point in time before the number i of length measurement value data taken into the data processing device 2 reaches N+1.

By the way, control charts such as Ni control charts and R control charts are usually measured every few days, and these control charts are created from the measured data. In this case, if the number of samplings N in one measurement is set to one of 4 to 6, for example 5, and the length measurement value data Di is sequentially imported each time, the management data storage area 55A contains the following data: The average value of the five length measurement value data Di sequentially taken in for each group number and the runout IIIR are sequentially stored. On the other hand, after selecting micrometer IB with the measuring device selection switch 40,
In the micrometer IB, when the setting work and the measuring work are performed in the same manner as described above, the length measurement value data Di of the sampling number N preset for each set number is stored in the management data storage area 55B. The average value of R and the amplitude R are sequentially stored.

Here, if you want to continuously output the 7 control chart and R control chart of the parts measured with the micrometer IA, and the i control chart and R control chart of the parts measured with the micrometer IB, enter the "O1" code. If you want to continuously output control charts for parts measured with both micrometers IA and IB, select 2.
If you want to continuously output the R control chart of the parts measured with both micrometers IA and 1B, use the 02" code.
3" After entering each code, press the tabulation key rFIG"
Press. Then, the control circuit 36 performs processing according to the flowchart shown in FIG.

That is, after the average value length of the average value i- to 7 and the average value R of the runout IIIRI to Rk stored in the management data storage area 55A are determined, the upper control limit U of the i control chart is determined.
CL, lower control limit LCL, and upper control limit UCL and lower control limit LCL of the R control chart are determined, respectively. Subsequently, after the average values 1 to 1 and the average values i of the amplitudes R and Rk stored in the management data storage area 55B are determined, the upper control limit UCL of the control chart is determined.
Lower control limit LCL and upper control limit UC of R chart
L and lower control limit LCL are respectively determined. Incidentally, the average values x and R can be divided into 9. Here, Σf
is the sum of father and ~wa, ΣR is the sum of R-~Rk, and k is the number of pairs. Further, the upper control limit UCL and lower control limit LCL of the i control chart can be determined by U CL = x + A 2 R L CL = x A 2 R. In addition, the upper control limit UCL and lower control limit LCL of the R chart are UCL = D 4
It can be determined that R L CL = D 3π. Note that A2, D3, and D4 are coefficients determined by the size of the set (number of samples N),
It is set in advance.

Next, the code data input before the work key rFIGJ is 01. '02'', '03'' (7
) It is determined whether there is a difference. Here, when the code data is 01'', various data such as the date and measurement person number stored in the setting data storage area 52A and the calculation results (i, UCL, LCL, R, UC) are stored in the setting data storage area 52A.
After L) is printed, a control chart and a control chart B are sequentially printed for the parts measured by the micrometer IA based on the calculation results and each data in the management data storage area 55A. Subsequently, various data of the date, iM former number, and the calculation result (length, UCL, LCL, R, UCL, LC) stored in the setting data storage area 52B are displayed.
After L) is printed, an f control chart and an R control chart of the component measured with the micrometer IB are sequentially printed based on the calculation result and each data in the management data storage area 55B. At this time, the drawing data for these control charts is
After being edited into a predetermined format so that the group number is displayed in the paper feed direction and the management data is displayed in a direction perpendicular to the set number, that is, in the paper radial direction, the data is output to the printer 33.

Therefore, these control charts are output in the format shown in FIG.

Further, when the code data is 02'', the various data stored in the setting data storage areas 52A and 52B and the calculation results (x, UCL, LCL) are printed in sequence, and then the calculation results and management data are printed. Micrometer IA based on the average value of storage area 55A
of parts measured in! A control chart is printed, and then an i control chart of the component measured with the micrometer IB is printed based on the average value k in the management data storage area 55B. Therefore, it is output in the format shown in FIG.

Further, when the code data is 03'', the various data stored in the setting data storage areas 52A and 52B and the calculation results (R, UCL, LCL) are printed in sequence, and then the calculation results and management data are printed. The R control chart of the component measured with the micrometer IA is printed based on the amplitude H in the storage area 55A, and then the R control chart of the component measured with the micrometer 1B is printed based on the amplitude H in the management data storage area 55B. A control chart is printed.

Therefore, it is output in the format shown in FIG.

Therefore, according to this embodiment, the data processing device I2 is separate from the micrometers 1-A and 1-B, and both are connected to each other by the signal transmission cable 3 so that they can exchange information, and each micrometer IA, In the IB, in response to a data import command from the data processing device 2, after converting length measurement mode information, length measurement value information, code information, decimal point position information, length measurement unit, and pass/fail judgment information into a BCD encoded signal. Since the data processing device 2 is synchronized with the clock pulse from the data processing device 2 and is transmitted in a heavy serial manner, the micrometers IA and IB can be used as conventional length measuring instruments, so the measurement work itself has been significantly changed. In other words, it is not necessary to acquire specialized skills, and the features of small size and ease of handling can be maintained. Moreover, with such a configuration, the micrometer can be used alone.

Furthermore, since the length measurement value data is directly input to the data processing device 2, there are no errors associated with transcription, and therefore accurate quality control data can be obtained quickly and efficiently. This also does not require a particularly large computer, so there is no risk of reducing its operating rate.Furthermore, since the data transmission is BCD code clock pulse serial transmission, large amounts of data can be transmitted at high speed, and the circuit It is also compact and easy to use.

In addition, since quality control data can be obtained at the measurement location, the process capability of the production line can be immediately determined, and in particular, tools can be replaced immediately. Moreover, since a data import key rDATAJ is provided on the data processing device 2, there is no fear that length measurement value data will be erroneously imported due to an operational error during measurement.

In addition, the upper and lower limits of the allowable dimensions for the reference dimensions of the object to be measured are set as first and upper limits HH and LL, and
A second upper limit value H and a lower limit value are set within the allowable dimensions than these upper and lower limit values HH and LL, and the quality of the length measurement data given from micrometers IA and 1B is determined based on these upper and lower limit values. This makes it easy to distinguish between non-defective products and defective products, and also to easily determine the status of transition from non-defective products to defective products. Note that the first upper and lower limit values HH
, LL and the second upper and lower limit values H, L, if a warning is issued when a preset number of measurement value data Di continues, it can be done before processing a large number of defective products. Tools can be replaced or adjusted.

In addition, each time the data import key r IIATAJ is pressed, it is determined whether the imported length measurement value data Di belongs to any division Ndj of the allowable dimensions equally divided by the number of divisions NJ, and each division Length measurement value data Di belonging to Ndj
Count up the frequency Fj.

When the number I of the length measurement data Di reaches a predetermined value, a predetermined arithmetic processing is performed so that these ≠ - digits fit within the printing digits of the printer, and then displayed as a histogram according to the frequency. Since the accuracy distribution of the length measurement data of a group of objects to be measured and their changes can be judged at a glance, it is possible to omit measurement or reduce the number of samples for certain processed products. It can also be used as reference material for adjustments on the processing machine side.

This also has the advantage of not requiring a high degree of judgment from the operator.

In addition, from the imported length measurement value data Di, statistical data such as the average value f, swing width R1 standard deviation S, D, and defective rate FR
Since quality control data such as A, D, process capability index c, p, etc. are automatically entered, these data can be created easily and quickly.

Also, when the number I of length measurement value data Di becomes the number (N+1) obtained by adding 1 to the preset sampling number N, N
Since the above-mentioned statistical processing and histogram processing are automatically performed based on the data up to the Nth measurement, the Nth measurement error may occur due to a measurement error such as misidentification of the surface to be measured, insufficient contact between the two, or a change in the measuring force. Even if long value data Di is imported, after canceling that length value data and importing new length value data, automatic processing will be performed when the next (N+1st) length value data is imported. Therefore, quality control data can always be generated based on normal data without including erroneous length measurement value data. Moreover, since the N+1-th data is stored and printed as the first data of the next process, there is no need to perform a new measurement.

On the other hand, a print key rPRINT J is provided, and when this print key rPRINT J is operated, the above-mentioned statistical processing and histogram processing are automatically performed, so that the above-mentioned processing can be performed at any time when the number of data is 1. can. Therefore, even when the sampling number N is large, for example about 1000, it is not necessary to wait until the data quantity reaches the sampling number N, and statistical data and histogram data at an intermediate point in time can be obtained at any time.

In addition, the average value i of the length measurement value data Di of the sampling number N
and the runout R are sequentially transferred and stored in the management data storage areas 55A and 55B with set numbers added, and tabulation key rFI is used.
When GJ is pressed, these management data storage areas 55
Since control charts and R control charts are automatically output based on the average value and runout H stored in A and 55B, these control charts can be created extremely easily and quickly. . Moreover, when creating these control charts, N sets of data are created in the paper feeding direction.

The management data is displayed in the direction perpendicular to the width direction of the paper, that is, the indefinite set number is displayed in the paper feed direction, and the qualitative management data is displayed in the paper whose width is predefined. Since the data are displayed in the respective radial directions, it is possible to simplify the processing for storing the data in a predetermined paper.

Furthermore, the data processing device 2 includes a plurality of micrometers IA,
Connect IB and each micrometer IA.

x, R control chart for each 2B, each micrometer IA.

Since IB homogeneous control charts can be selectively output, if output is specified, necessary management can be output in the most easily viewable format.

In addition, during the setup work before starting measurement, on the 1st day, measurer N
0, part number, device number, etc., and these are printed on paper, so these printed contents can be used as data headings, which is extremely convenient when creating or storing quality control data later. On the other hand, print selection keys 41 are provided, and if these keys are turned on in advance, the print data corresponding to each key is not printed, so if no key is operated, all the contents are predetermined. It is possible to print out the items in the specified order, and therefore, it is not necessary to selectively combine the items to be printed, so the key operations are extremely easy and the work is quick.

In the above embodiment, two micrometers IA and IB are used as the length measuring means, but three or more may be used as the measuring means, and in addition to the micrometers, calipers, dial gauges, hide gauges, etc. Using measuring equipment,
Signals from those measuring instruments can also be directly input to the data processing device 2. Incidentally, a dial gauge or the like may detect the amount of movement of a spindle, and a caliper, a hide gauge, or the like may detect the amount of movement of a slider as an electric signal. Moreover, among these measuring instruments, for those equipped with a maximum value and minimum value hold function, a code that identifies the type is used as the length measurement mode identification code, and for those equipped with a pass/fail determination function, a code that identifies the type is used as the pass/fail determination code. A unit code containing data may be set in the unit and pass/fail determination code.

In addition, as an encoder that detects these movement amounts,
In addition to the photoelectric type using the main scale and index scale explained in the above embodiment, for example, a magnetic scale type,
Various types of rings such as capacitive type, contact type, resistive type, and laser type can be applied.

Further, in the above embodiment, the data acquisition key is provided only on the data processing device 2, but the data acquisition key may be provided on the length measuring means such as a micrometer as well as the data processing device M2. . Furthermore, instead of providing a data acquisition key, for example, in a caliper or a micrometer, a piezoelectric element is provided on one of the contact members that contact the object to be measured.
Each of the data may be acquired based on a detection signal when a certain measuring force is applied to the piezoelectric element.

In this case, a touch signal probe is preferable to a piezoelectric element in a hide gauge or the like.Furthermore, the recording means for each data may be, for example, a CRT, a recorder, etc. in addition to a printer.

Further, in the above embodiment, the number of data i of the length measurement value data Di
When the number reaches N+1, calculations such as statistical results etc. are started automatically, but any calculation is possible as long as it is N+1 or more. The information may be recorded on a card or the like and inserted into the data processing device 2 to be read.

Furthermore, as for control charts, in addition to the control charts and R control charts described in the above embodiments, control charts and S control charts (S: standard deviation) may also be used. You can use this to print control charts in different colors. Furthermore, at least management data storage areas 55A, 55
Regarding data B, it is preferable to take measures to ensure that the memory is not erased even if the power is cut off due to a power outage, etc. In addition, the upper control limit UCL and lower control limit LCL of the k control chart and R control chart can be determined by calculation. In addition to inputting a predetermined value from a keyboard, it is also possible to enter a predetermined value using a keyboard.

[Effects of the Invention] As described above, according to the present invention, it is possible to calculate quality control data by directly inputting measurement value data without transcribing the measurement value data, and when creating a control chart from this input data. Since there is no need to take into account the uncertainty of the number of data sets, it is possible to provide a digital display type length measurement system that can simplify the processing for this purpose.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view showing the overall appearance, Fig. 2 is a block diagram showing the micrometer circuit, and Fig. 3 is an explanatory diagram showing the format of transmission data. , FIG. 4 is an explanatory diagram showing an example of the same data, FIG. 5 is a block diagram showing the circuit of the data processing device, FIG. 6 is a front view showing the keyboard, and FIG. 7 is an explanatory diagram showing the contents of the storage section. . Figures 8 (A), (B), and (C) are diagrams showing key operation examples and print samples, Figures 9 (A) and (B) are flowcharts based on data import key operations, and Figure 1O is a diagram showing limit values. FIG. 11 is a flowchart based on the operation of the tabulation key, and FIGS. 12 to 14 are printed control chart samples. IA, IB...Micrometer as length measuring means, 2
...Data processing device as data processing means, 14.
...Spindle, 15...Digital display, 21...
- Encoder, 32... Arithmetic circuit, 33... Printer as tabulation device, 36... Control circuit. Agent Patent attorney Minoru Kinoshita (and 1 other person) Figure 1 Figure 6 Figure 7 Figure 8 (A) Figure 8 (B) Figure 8 (C) Figure 10 1 Food Figure 1

Claims (1)

[Claims] (1) A length measuring means including an encoder that detects the amount of displacement of the spindle, etc. that comes into contact with the object to be measured as an electrical signal, and a digital display that digitally displays the output signal from the encoder. , From the output data of this length measuring means, the average value (k) and range (R
or S), etc., and a data processing means including an arithmetic circuit for storing quality control data and a tabulation device having a control chart creation function. The tabulation device is a digital display type measurement device characterized in that it is configured to display a set of data in the paper feeding direction and display control data in a direction perpendicular to this to create a control chart. long system.