JPH03163309A - Long-material measuring method - Google Patents

Abstract

PURPOSE:To make it possible to reduce measuring errors by providing a first sensor and a second sensor on the moving path of a long material so that the interval between the detecting reference position of the first sensor and the detecting reference position of the second sensor becomes a measuring reference distance, and performing an inching measurement. CONSTITUTION:Adhesive tape 7 is sequentially bonded to the surface of a long material at a section between a tape bonding roller 10 and a tape releasing roller 11 with the running of the long material 1. The tape 7 is released from the surface of the long material 1 at the position of the roller 11 and wound 12. When the long material 1 is moved and the detecting point at the tip of a start mark 80 reaches a detecting reference position 4a of a second sensor 4, the detected signal is outputted from the sensor 4. The signal undergoes A/D conversion 6 and inputted into a main body 13 of a measuring device. At this time, the main body 13 provides a display device 14 with a display (a) as the length. The main body 13 also gives a measuring command to an image controller 5. Thus, a first sensor 3 detects a deviating distance Ci between the detecting point of a first mark 81 and a detecting reference position of 3a of the sensor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring long objects such as cables.

[Prior art] Conventionally, the measuring method for long objects has been measured using an encoder method or a measuring method (
marking method).

The encoder method brings an encoder wheel into contact with a long object, rotates the encoder wheel as the long object moves, outputs pulses from the encoder according to the rotation angle, and counts the pulses. This is a measuring method in which measuring is performed based on the pulse count number and the length of one pulse.

Such an encoder method has the advantage that it is possible to measure short lengths that cannot be measured using the marking method.

On the other hand, in the measuring method, a marker and a sensor are installed at a measuring standard distance S in the direction of movement of the long object, and the output from the sensor is sent to the main body of the measuring device such as a computer. The marker makes a mark on the surface of the long object based on the command from the sensor, and when the mark is detected by the sensor, it counts as 1, and the measuring operation is repeated by issuing the next marking command to the marker, and then the final count is made. This is a measuring method in which an object longer than N-S is measured from N and a measuring standard distance S.

In such a measuring method, a highly accurate measuring reference distance S
Since the measurement is performed as a multiple of , it has the advantage of higher measurement accuracy than the encoder method.

[Problems to be Solved by the Invention] However, such encoder methods and scale-taking methods have the following problems.

Encoder method a. Measurement errors occur due to slippage between the encoder wheel and the long object.

b. Temperature fluctuations in the outer diameter of the encoder wheel (temperature fluctuations) result in measurement errors due to fluctuations due to wear.

C. Measurement errors occur due to deformation of the surface of the long object.

Therefore, the limit of measurement accuracy of the encoder method is ±0.2%.
It is said that the degree of

Shaku-dori method a. It is not possible to make a measurement shorter than the measurement reference distance S.

b. When the accuracy of the markers is poor and the distance between adjacent marks fluctuates, this cannot be checked and measurement errors occur.

C. When the distance between marks changes due to a change in the moving speed of a long object, it cannot be checked and a measurement error occurs.

d. When the operation timing of the marker shifts due to irregularities on the surface of a long object and the distance between marks changes, this cannot be checked and a measurement error occurs.

As mentioned above, the measurement accuracy of the measuring method has the problem that it depends on the accuracy of the mark.

An object of the present invention is to provide a method for measuring a long object that can reduce measurement errors.

[Means for Solving the Problems] The means of the present invention for achieving the above means are as follows.

The invention of claim (1) provides that the measuring standard distance S is substantially equal to the length S in the longitudinal direction.
In a method for measuring a long object marked with marks at a mark interval MS according to The sensor is installed so that the distance between the detection reference position of the sensor and the detection reference position of the second sensor is the measurement reference distance S, and the second sensor is installed except for the mark at the beginning of the measurement. By repeating one count each time each of the marks is detected after that, the measuring method is performed by the measuring method. and each time the second sensor detects the detection point of the front mark among the rear marks, calculate the distance Ci by which the detection point of the rear mark deviates from the detection reference position of the first sensor. The length L of the elongated object is determined by the detection by the first sensor, and the length L of the elongated object is determined by correcting the scale value of the length measuring method using the respective distances Ci.

The invention of claim (2) provides that the measuring standard distance S is substantially equal to the length S in the longitudinal direction.
In a method for measuring a long object marked with marks at a mark interval MS according to The sensor is installed so that the distance between the detection reference position of the sensor and the detection reference position of the second sensor is the measurement reference distance S, and the second sensor is installed except for the mark at the beginning of the measurement. By repeating one count each time each of the marks is detected after that, the measuring method is performed by the measuring method. and each time the second sensor detects the detection point of the front mark among the rear marks, calculate the distance Ci by which the detection point of the rear mark deviates from the detection reference position of the first sensor. Determined by the detection of the first sensor, from the final count value N of the measuring scale in the measuring method, each distance Ci each time the second sensor detects each mark, and the measuring standard distance S. It is characterized in that the length L of the long object is determined from L=ΣCi+N−S.

[Function] When measuring as described above, the deviation in the mark interval is corrected and the measuring method is performed, so the measuring accuracy can be significantly improved without being affected by the accuracy of the marks.

Since the distance Ci of the deviation between the marks is detected by the first sensor using, for example, an image camera, the detection can be performed without using an encoder that is likely to cause errors.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of a measuring device for a long object used in the method for measuring a long object according to the present invention. In the figure, 1 is a long object such as a cable, 2 is a roller that supports the long object 1 and helps it move, and 3 and 4 are the distances between the detection reference positions on the moving path of the long object 1, which is the measuring standard distance S. The first and second sensors are installed so that The first sensor 3 is of a type such as an image camera that can electronically detect the distance Ci of the deviation between the detection point of the mark (for example, the start edge; the same applies hereinafter) and the detection reference position of the first sensor 3. Use the one. As the second sensor 4, a type that can detect edges with high accuracy, such as a laser switch, is used. 5 is an image controller that controls the first sensor 3, and 6 is an analog/digital converter (hereinafter referred to as an A/D converter) that converts the output signal from the second sensor 4 from analog to digital and outputs it. be. Reference numeral 7 denotes an adhesive tape on which marks 8 are attached by printing or the like in the longitudinal direction at a mark interval MS approximately corresponding to the measurement standard distance S, 9 a tape supply drum that feeds out the adhesive tape 7, and 10 from the first sensor 3. A tape adhesion roller 11 adheres the adhesive tape 7 to the surface of the elongated object 1 along its longitudinal direction on the upstream side, and a tape adhesion roller 11 peels off the adhesive tape 7 from the surface of the elongated object 1 on the downstream side of the second sensor 4. A tape peeling roller 12 is a tape winding drum that winds up the peeled adhesive tape 7. In this embodiment, the adhesive for the adhesive tape 7 is a releasable adhesive that can be easily peeled off when attached to the long object (2). Reference numeral 13 denotes a measuring device main body comprising, for example, a computer, which performs measuring operations using signals from the image controller 5 and the A/D converter 6 as input signals;
14 is a display device for displaying the measuring results of the measuring device main body 13;
Reference numeral 15 denotes an input device for inputting measuring results using a tape measure or the like to the measuring device main body 13 at the time of starting or ending measuring.

Next, a measuring method using such a measuring device for a long object will be explained with reference to FIG. 1 and FIGS. 2 to 5.

Before starting measuring, as shown in FIG. 1, the adhesive tape 7 fed out from the tape sublime drum 9 is adhered to the surface of the elongated object 1 along the elongated direction using the tape adhesion roller 10. Marks 8 are left at a predetermined mark interval MS in the section between the tape adhesion roller 10 and the tape peeling roller 11 on the surface of the length body 1.

When starting the measurement, the mark existing between the first and second sensors 3 and 4 is used as a start mark 8o, as shown in FIG. Also, measure the distance a from the detection point of this start mark 8o to the tip IA of the long object 1 with a tape measure or the like,
The measured value a is inputted to the measuring device body 3 using the input device 15. The measured value a is temporarily stored in the memory of the measuring device main body l3.

Note that 3a and 4a are the detection reference positions of the second and second sensors 3 and 4.

In this state, a measuring start command is given to the measuring device main body 13, the long object 1 is made to run, and measuring is started. As the long object runs, the adhesive tape 7 is successively adhered to the surface of the long object 1 in the section between the tape adhesion roller 10 and the tape peeling roller 1, and the adhesive tape 7
The tape is peeled off from the surface of the long object 1 at the position , and wound onto the tape winding drum 12 .

When the long object t moves and reaches the state shown in FIG. 2, when the detection point at the tip of the start mark 8o reaches the detection reference position 4a of the second sensor 4, a detection signal is output from the second sensor 4. The signal is inputted to the measuring device main body 13 via the A/D converter 6. At this time, the measuring device main body 13 displays a on the display 14 as a length display. Also, at this time, the measuring device main body 13 gives a measuring command to the image controller 5.

As a result, the first sensor 3 consisting of an image camera,
Distance C+ (i.e.,
This C1 is the distance of the difference between the mark interval MS and the measuring reference position S. ) is detected.

A general method for measuring this distance C1 is as follows.

The error distance Ci of the i-th mark 81 is the (i-1
)th mark 8.1 detection point is the second sensor 4
By reading the image data of the first sensor 3 at the timing detected by , it is obtained from the following equation.

Ci=(χ.1χ,)·P where χ,6: pixel order χ of the first sensor 3 where the detection point of the i-th mark 8i exists. : Order of the center pixels at the measuring reference position 3a of the first sensor 3 P: Distance between the centers of adjacent pixels The value of the distance Ci measured from the above formula is χ, in this case χ. Since it is on the left side of , it is a negative value. The value of this distance C1 is temporarily stored in the memory in the measuring device main body l3, and is added to the measuring value S of the measuring measuring meter to be performed next.
The measuring scale value S is corrected.

Normally, each time the second sensor 4 detects a mark, a measurement is performed and the count value is counted up one by one, but in the case of this invention, the first mark at the beginning of the measurement is measured. When the start mark 8RO is detected by the second sensor 4, counting is not performed, and counting is started from when the subsequent first mark 8I is detected.

The long object 1 moves from the state shown in FIG. 3 by the measuring reference distance S, and the first mark 81 reaches the detection reference position 4a of the second sensor 4 as shown in FIG. When the detection point of the mark 81 is detected, the detection signal is sent to the A/D converter 6.
It is input to the measuring device main body 13 through. At this time, the measuring device main body 13 counts the count value of the measuring meter by 1, and the detection point of the second mark 82 at this point is the first point.
Distance C2 deviated from the detection reference position 3a of the sensor 3
is detected as described above and its value is stored in memory.

The value of distance C2 in this case is χ. is χ. Since it is on the right side of , it is a positive value.

When the first scale measurement is performed in this way, the measuring device main body 13 outputs the measurement scale value (1·S) at that time,
Distance C1 of the first mark 81 when measuring this length
and the initial value a at the start (a+1・S+Cl)
The value of is displayed on the display 14 as a length display.

Such measuring operation is repeated, and when the Nth mark 8N passes the detection reference position 4a of the second sensor 4 and the measuring is completed as shown in FIG. 5, the length is displayed. It will look like this:

That is, the length display at the time when the detection point of the Nth mark 8N is detected at the detection reference position 4a of the second sensor 4 is a+ΣCi+N-S.

Furthermore, if the movement of the long object 1 is stopped in the state shown in FIG.
The input device 1 measures the distance b between the detection point at the position of the Nth mark 8N and the end 1B of the long object 1 with a tape measure or the like.
5, the length is input to the measuring device main body 13, so the length is displayed as a+Σci +N-s+b.

In the above embodiment, the distance Ci, which is the difference between the standard distance S and the mark interval MS, is corrected for each measuring scale, but the distance Ci of the difference is Instead of making the correction each time, the distance Ci of the difference may be added separately each time, and the correction of N·l/S may be performed as ΣCi at the final time.

Note that the adhesive tape 7 may be a magnetic tape with a releasable adhesive attached to one side, and a magnetic mark may be attached to the tape.

Alternatively, the marks may be placed directly on the surface of the elongated object 1 in advance without using the adhesive tape 7.

FIG. 6 shows a second embodiment of a long object measuring device used in the long object measuring method according to the present invention. In addition,
Parts corresponding to those in Figure ↓ are indicated with the same symbols. In the figure, 16 is the detection reference position 3 of the first sensor 3.
This is a marker that attaches the next mark 8 to the surface of the long object 1 in response to a command from the measuring device main body 13 when the detection point of the mark 8 reaches point a. The marker 16 is installed at a position upstream from the detection reference position uiE3a of the first sensor 3 by a distance L approximately equal to the measurement reference distance S.

Next, a measuring method using such a measuring device for a long object will be explained with reference to FIGS. 6 and 7 to 12.

Before starting measuring, as shown in FIG.
A marking command is issued to the marker 16 to attach a start mark 8o. The mark may be attached by an inkjet method, a stamp method, or the like, or by a label pasting method. Note that 16a is a position marked by the marker 16. The distance a from the detection point of the start mark 8o to the tip 1A of the long object 1 is measured with a tape measure or the like, and the measured value a is input into the measuring device main body 13 using the input device 15.

In this state, a start command is given to the measuring device main body 13,
The long object 1 is moved and measuring is started.

When the start mark 8o reaches the detection reference position 3a of the first sensor 3 and the detection point is detected by the first sensor 3 as shown in FIG. When input to the measuring device main body 13, a marking command is sent from the measuring device main body 13 to the marker 1.
6, a first mark 81 is attached to the surface of the elongated object 1.

As the long object 1 moves, the start mark 8o reaches the detection reference position 4a of the second sensor 4 as shown in FIG. 9, and the detection point of the start mark 8o is detected by the second sensor 4. Then, a detection signal is output from the second sensor 4 and A
The signal is input to the measuring device main body 13 via the /D converter 6. At this time, the measuring device main body 13 displays the above-mentioned a on the display 14 as an indication of the length. At this time, the measuring device main body 13 gives a measuring command to the image controller 5, and in the same manner as described above, the detection point of the first mark 81 is shifted from the detection reference position 3a of the first sensor 3. The first sensor 3 detects the distance C1. The value of distance C1 in this case is positive.

The value of this distance C1 is temporarily stored in the memory within the measuring device main body 13.

Further, at the time when the detection point of the start mark 8o is detected by the second sensor 4, a marking command is issued from the measuring device main body 13, and the marker 16 moves the second mark 82 to the ninth point.
It is attached to the surface of a long object 1 as shown in the figure.

As the long object 1 moves further, the first mark 81 reaches the detection reference position 4a of the second sensor 4 as shown in FIG. When detected by the sensor 4, a detection signal is output from the second sensor 4 and inputted to the measuring device main body 13 via the A/D converter 6. At this time, the measuring device main body 13 counts the count value of the measuring scale by 1, and the distance C2 at which the detection point of the second mark 82 at this point is shifted from the detection reference position 3a of the first sensor 3 Detect and store the value in memory. The value of distance C2 in this case is a negative value.

Further, at the time when the detection point of the first mark 81 is detected by the second sensor 4, a marking command is issued from the measuring device main body 13, and the marker 6 moves the third mark 83 to the 10th mark.
It is attached to the surface of a long object 1 as shown in the figure.

When the first scale measurement is performed in this way, the measuring device main body 13 outputs the measurement scale value (1·S) at that time,
Distance C1 of the first mark 81 when measuring this length
and the initial value a at the start (a+1・S+Cl)
The value of is displayed on the display 14 as a length display.

As the elongated object (2) moves further, the second mark 82 reaches the detection reference position 4a of the second sensor 4 as shown in FIG. When detected by the second sensor 4, a detection signal is output from the second sensor 4 and inputted to the measuring device main body 13 via the A/D converter 6. At this time, the measuring device main body 13 counts the count value of the measuring scale by 1, and makes the total count value 2. Also,
The measuring device main body 13 detects the distance C3 by which the detection point of the third mark 83 is shifted from the detection reference position 3a of the first sensor 3 at this time, and stores the value in the memory. The value of distance c3 in this case is a positive value.

Further, at the time when the detection point of the second mark 82 is detected by the second sensor 4, a marking command is issued from the measuring device main body l3, and the marker l6 moves the fourth mark 84 to the eleventh mark.
It is attached to the surface of a long object 1 as shown in the figure.

When the second scale measurement is performed in this way, the measuring device main body l3 calculates the difference between the current scale measurement value 2·S and the second mark 82 at the time of this measurement. Distance C2 and
Sum with initial value a at start (a+2●S+CI+02
)=(a+2●S+LCi) is displayed on the display 14 as a length display.

Such a measurement operation is repeated, and when the measurement is completed when the Nth mark 8N passes the detection reference position 4a of the second sensor 4 as shown in FIG. 12, the length is displayed. It will look like this:

That is, the length display at the time when the detection point of the Nth mark 8N is detected at the detection reference position 4a of the second sensor 4 is a+ΣCi+N●S.

Furthermore, when the movement of the long object 1 is stopped in the state shown in FIG.
Since the distance b between B and B is measured using a tape measure or the like and input into the measuring device main body 13 using the input device 15, the length displayed is a+ΣCi+N-s+b.

In this second embodiment, except for the start mark 8o and the first mark 81, the measuring device main body 13 issues a marking command at the time when the second sensor 4 detects the mark. The marking command may be issued at the time when the mark is detected. In this case, marking can be performed while avoiding the influence of twisting of the long object 1 as much as possible.

When the first sensor 3 is an image camera, a third sensor such as a laser switch is provided so that its detection reference position matches the detection reference position of the first sensor 3 in order to speed up the response. is preferred.

In each of the above embodiments, a case has been described in which the distance Ci is detected using an image camera as the first sensor 3. However, it is also possible to scan the first sensor 3 and detect the distance Ci as shown in the following equation. You can also do it. Scanning in this case can be performed, for example, by rotating the laser beam at high speed with a rotating mirror.

Ci=(tsc tc) ・Q However, t SE :The first sensor 3 is the i-th mark 81
Time to when the first sensor 3 detects the measurement reference position 3a: Time Q when the first sensor 3 detects the measurement reference position 3a: Scanning speed of the first sensor 3 In each of the above embodiments, Since both of the sensors 3 and 4 of No. 2 are of the photoelectric type, measurement can be performed without contact. When measuring without contact in this way, even if there are irregularities on the surface of the long object 1, or even if the surface of the long object 1
Even if you are not allowed to touch the surface of the surface, you can measure it without any trouble.

[Effect of the invention] As explained above, in the method for measuring a long object according to the invention, the main measuring method is performed by a measuring method with high measurement accuracy,
Difference Ci between each measuring standard distance S and the mark interval MS at that time
Since the measurement is performed using the first sensor to determine the length of a long object, the following effects can be obtained.

■Since the measuring method is performed by correcting the deviation in the mark interval, it is possible to perform the measuring method using the measuring method with high accuracy without being affected by the accuracy of the marks.

(2) Since the distance Ci of the difference in mark interval is detected by the first sensor, the detection can be performed without using an encoder which is likely to cause errors.

■In particular, in claim (2), L=
Since it is determined from ΣCi+N−S, it can be easily performed using a measuring device using a computer or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of an apparatus for carrying out the measuring method for a long object according to the present invention, and FIGS. 2 to 5 show the measuring operation process by the apparatus shown in FIG. 1. Explanatory diagram, No. 6
The figure is a block diagram showing a second embodiment of the apparatus for carrying out the method for measuring a long object according to the present invention, and FIGS.
FIG. 3 is an explanatory diagram showing a measuring operation process by the device shown in the figure. 1... Long object, 2... Roller, 3, 4... First,
Second sensor, 3a, 4a... detection reference position, 5...
- Image controller, 6... Digital/analog converter, 7... Bonding tape, 80-8N... Mark, 9... Tape supply drum, 10... Tape adhesive roller, 11... Tape peeling roller, 12... Tape winding red drum, 13... Measuring device main body, 14...
- Display device, 15... Input device, 16... Marker. Figure 2 Figure 3 Figure 4 Figure 8 Figure 1 4. Patent Application No. 301995 of 1999 Name of the invention Relationship with the case of a person who corrects the measuring method for long objects Patent applicant (529) Furukawa Electric Co., Ltd.

Claims (2)

[Claims] (1) In a method for measuring a long object in which marks are attached in the longitudinal direction at a mark interval MS that corresponds to a measuring reference distance S, the long object is 1st
, a second sensor is installed such that the distance between the detection reference position of the first sensor and the detection reference position of the second sensor is the measurement reference distance S, and the second sensor Measurement using the shaku-taking method is performed by repeating one count each time each mark is detected after excluding the mark at the beginning of the shaku. Every time the second sensor detects the detection point of the front mark among adjacent front and rear marks in a row of marks, the detection point of the rear mark at that time is determined by the first sensor. A distance Ci that deviates from the detection reference position is determined by detection by the first sensor, and the length L of the long object is determined by correcting the scale value of the measuring method using each of the distances Ci. A method for measuring long objects characterized by the following. (2) In a method for measuring a long object that is marked at a mark interval MS that corresponds to a measuring reference distance S in the longitudinal direction, the long object is placed on the moving path of the long object. 1st
, a second sensor is installed such that the distance between the detection reference position of the first sensor and the detection reference position of the second sensor is the measurement reference distance S, and the second sensor Measurement using the shaku-taking method is performed by repeating one count each time each mark is detected after excluding the mark at the beginning of the shaku. Every time the second sensor detects the detection point of the front mark among adjacent front and rear marks in a row of marks, the detection point of the rear mark at that time is determined by the first sensor. The distance Ci that deviates from the detection reference position is determined by the detection of the first sensor, and the final count value N of the measuring scale of the measuring method and the second
Each time the sensor detects each mark, each distance Ci
A method for measuring a long object, characterized in that the length L of the long object is determined from ▲a mathematical formula, a chemical formula, a table, etc.▼ from the measuring standard distance S.