JPH08184512A - Method and apparatus for measuring tension - Google Patents

Abstract

PURPOSE: To eliminate the measurement error caused by the rigidity of a long object or the like while simplifying the processing for determining tension from detected values and to lessen the work for inputting data of a memory. CONSTITUTION: A tension detecting section 2 disposed on the top of a case 11 comprises two guide rollers 12 and a sensing roller, i.e., a contactor 13, disposed between them. Both guide rollers 12 are carried on a support 14 penetrating the case 11 through a compression spring 11 which urges the support 14 downward so that the support can be displaced upward through action of a grip 16. The contactor 13 is coupled with the pressure receiving part 17 at a load detecting section 1 comprising a hollow square strain gauge load cell and a long object 18 to be measured is stretched in an S-shape being wound on both guide rollers 12 and the sensing roller 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension measuring method and apparatus for accurately measuring the tension of various long objects such as long linear objects, tapes and sheets.

[0002]

2. Description of the Related Art As a tension measuring method and apparatus,
The long object to be measured is wrapped around a movable contactor such as a sensing roller in the tension detecting section, and the force component of the tension generated by bending of the long object to be measured in the contactor is detected by the load detecting section and its detected value. It is widely known that the tension is calculated based on.

In the above-described measuring method and apparatus, bending stress due to the rigidity of the long object to be measured is applied to the contact and affects the detection value of the load detecting section, which causes the error in measuring the tension. As a tension measuring method and apparatus in consideration of the rigidity of such a long object to be measured, Japanese Patent Publication No.
In each publication such as 16539 and Japanese Patent Publication No. 6-52208, an actual detection value including the influence of rigidity by a load detection unit for a long object to be measured having an arbitrary diameter or thickness is specified by a specific empirical formula or theoretical formula. Is converted to an ideal detection value excluding the effect of rigidity based on the above, and the tension is calculated from the ideal detection value thus converted based on the relational expression between the tension stored in advance and the ideal detection value. What has been done is disclosed.

[0004]

However, in the above-described tension measuring method and device in which the conversion of the actual detected value into the ideal detected value is involved in the calculation of the tension, an accurate measured value can be obtained, but the arithmetic processing is performed. However, there is a problem in that a large-capacity arithmetic processing device is required to obtain a processing speed which is complicated and a practical range, and a large number of man-hours are required for inputting data to the storage device.

The problem to be solved by the present invention is to eliminate the occurrence of a measurement error due to the rigidity of a long object to be measured and to simplify the arithmetic processing for obtaining the tension from the detected value and to store the same in the storage device. It is an object of the present invention to provide a tension measuring method and device that reduce the work of data input.

[0006]

A tension measuring method according to the present invention is a tension measuring method in which a tension component force generated by bending a long object to be measured is detected to calculate the tension. different measuring long was the same type to each other diameter or reference detection value X _11, each of which is detected during the action of the plurality of reference tension T ₁ through T _n for a plurality Article reference long product having a thickness D ₁ to D _k ~ X _{1n to} X _k1
˜X _kn and the relational expression Y = g of the parameter Y related to the diameter or thickness D and the rigidity of a long object of the same kind as the long object to be measured.
(D) is stored, and parameters Y _a and Y _b corresponding to the diameters or thicknesses D _a and D _b and the diameter or thickness D ₀ of the two reference elongated objects among the plurality of articles and the measured elongated object, respectively. And Y ₀ is a relational expression Y
= Calculated based on g (D), diameter or thickness D _a, reference detection value according to the reference long of D _b X _a1 ~X _an and X _b1 to X _bn
From the parameters Y _a , Y _b and Y ₀ , the virtual detection values X _{01 to} X _0n relating to the long object to be measured having the diameter or the thickness D ₀ to be detected when the reference tensions T _{1 to} T _n are applied are proportional. relationship apportioning to inner挿又detection value by Tentei them linearly with extrapolation X ₀ and the tension T formula T = f ₀ (X
₀ ) is obtained, and the tension T _i is calculated based on the relational expression T = f ₀ (X ₀ ) with the variable X ₀ as the detection value X _i .

The tension measuring device according to the present invention is a tension measuring device for detecting a component force of a tension generated by bending of a long object to be measured to calculate the tension. A tension detecting unit having a movable contact that contacts with the load, a load detecting unit detecting a component force of the tension applied to the contact of the tension detecting unit as a detection value X _i , and a diameter or thickness D ₀ of the long object to be measured. A plurality of reference tensions T _{1 for} a diameter or thickness detection setting section for detecting or setting a plurality of reference elongated objects having the same type as the measured elongated object but different diameters or thicknesses D _{1 to} D _k.
To T _n , a data storage unit that stores reference detection values X _{11 to} X _{1n to} X _{k1 to} X _kn detected by the load detection unit, and a diameter of a long object of the same kind as the measured long object or Relational expression Y = g (D) between the thickness D and the parameter Y relating to rigidity
And parameter function storage unit that stores, diameter or thickness D _a of the reference long of Article 2 in plural rows, D _b and diameter or of the measured long product thickness D ₀ and each corresponding parameter Y _a, Y _b and Y ₀ are calculated based on the relational expression Y = g (D), and reference detection values X _{a1 to} X relating to the reference long object having the diameter or the thickness D _a , D _{b.
From an} and X _{b1 to} X _bn to _a long object to be measured having a diameter or a thickness D ₀ to be detected by the load detection unit when the reference tensions T _{1 to} T _n are applied based on the parameters Ya, Y _b and Y _0. The virtual detection values X _{01 to} X _0n are proportionally proportionally interpolated or extrapolated and linearly stippled to obtain a relational expression T = f ₀ (X ₀ ) between the detection value X ₀ and the tension T. The variable X ₀ based on the relational expression T = f ₀ (X ₀ )
Is provided as a detection value X _i detected by the load detection unit, and a second calculation unit that calculates the tension T _i is provided.

As the contactor in the tension detector, for example, a known sensing roller or bar is used.

The load detecting section converts the component force of the tension into a strain amount or a displacement amount of the contact and outputs them as a detection value. The tension and the detection value have a substantially linear correlation. Sex is recognized. In this case, an elastic body having a relatively large spring constant of, for example, 10 or more is used for the load detection unit, and the displacement of the contact with respect to the amount of change in tension, and hence the bending of the long object to be measured wrapped around the contact. When the angle change amount is configured to be extremely small, a particularly excellent linear correlation is obtained between the tension and the detected value, and the detected value at this time is a strain amount rather than a minute displacement amount of the contact. From the viewpoint of detection accuracy, it is preferable to adopt. From the above-mentioned viewpoint, for example, a load detecting unit including a strain gauge type load cell can be preferably adopted.

In the diameter or thickness detection setting unit, for example, a sample of a long object to be measured or a thickness gauge having the same diameter or thickness as the sample is attached to detect the diameter or thickness of the long object to be measured. A known wire diameter detecting device or a wire diameter setting device for inputting and setting a known value of the diameter or thickness of the long object to be measured can be adopted.

The relational expression Y = g (D) between the diameter or thickness D and the parameter Y in a long product of the same type as the long product to be measured is preferably determined according to the material of the long product, the cross-sectional shape and other measurement conditions. And a variation range of Y = D ^{2.7 to} D ^4.5 can be selected.

In the above structure, a known bending angle correction device is required so that the bending angle of the long object to be measured wrapped around the contact is not affected by the change in the diameter or thickness of the long object to be measured. You may adopt according to.

[0013]

[Action] In the arrangement, size or on the basis of thickness D _a, the reference detection value X _a1 to X _an, and X _b1 to X _bn according to the reference long of D _b parameter Y _a, in the Y _b and Y ₀ reference Diameter or thickness D to be detected when the tensions T _{1 to} T _n are applied
_The virtual detection values X _{01 to} X _0n related to the measured long object of ₀ are calculated by the formula X ₀₁ = (X _b1 −X _a1 ) (Y ₀ −Y _a ) / (Y _b −Y _a ).
+ X _a1 and calculation formula X _0n = (X _bn −X _an ) (Y ₀ −Y _a ).
/ (Y _b −Y _a ) + X _an or the like proportionally proportionally interpolated or extrapolated and detected values X by the linear stippling thereof.
The relational expression T = f ₀ (X ₀ ) between ₀ and the tension T is obtained,
Based on the relational expression T = f ₀ (X ₀ ), the tension T _i is calculated with the variable X ₀ as the detection value X _i , and is output and displayed as necessary.

As the two-piece reference elongated object having diameters or thicknesses D _a and D _b , in order to obtain higher measurement accuracy, the diameter or thickness D _a closer to the diameter or thickness D ₀ of the object to be measured, It is preferable to select a material having D _b from a plurality of reference long objects, and the reference detection values of three or more reference long objects are stored in advance in order to enable such selection. It is preferable.

When the amount of change in the bending angle of the long object to be measured with respect to the amount of change in tension is extremely small, an excellent linear correlation can be obtained between the tension and the detected value. Therefore, the reference tension is necessary. Accordingly, only two may be adopted, and the relational expression T = f ₀ (X ₀ ) obtained in that case shows a straight line as a whole.

The data of the reference detection value is stored in a data storage unit or the like so that it can be selectively output individually for each of a plurality of types of reference long objects having different materials, cross-sectional shapes and the like, if necessary. The relational expression Y = g (D) is also recorded in the parameter function storage unit or the like so that it can be selectively output for each of a plurality of types of long objects having different materials, cross-sectional shapes, and the like. In these cases, the reference detection value and the relational expression Y = g (D) corresponding to the type of the long object to be measured are selected based on the type setting device of the long object provided separately. You may

The relational expression Y = g (D) is Y = D ^{2.7 to} D
^When selected from the range of ^4.5 , it can be applied well to almost all kinds of long objects to be measured, and in the usual case, Y = D ³ which is estimated from material mechanics is preferably adopted. it can.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the arithmetic structure of a tension measuring method and device according to an embodiment of the present invention, and FIG. 2 is an explanation of the arithmetic structure of the tension measuring method and device shown in FIG. 1 on coordinates. FIG.

In FIG. 1, the load detecting unit 1 detects the component force F of the tension generated in the tension detecting unit 2 as a detection value X _i , and the diameter or thickness detection setting unit 3 detects
The diameter or thickness D ₀ of the measured long object is detected or set.

In the data storage section 4, the action of _two reference tensions T ₁ and T ₂ is applied to two reference long strips of the same type as the long strip to be measured but having different diameters or thicknesses D ₁ and D _2. Reference detection values X ₁₁ and X ₁₂ related to the reference elongated object of diameter or thickness D ₁ and reference detection values X ₂₁ related to the reference elongated object of diameter or thickness D ₂ , which are sometimes detected by the load detection unit 1, respectively. Each data of X ₂₂ is stored in advance. In the XT coordinate shown in FIG. 2, the data is a virtual relational expression T = f ₁ (dotted line of reference detection values X ₁₁ and X ₁₂ for a reference long object having a diameter or thickness D _{1 in} a straight line. X ₁ ), and for a reference long object having a diameter or a thickness D ₂ , it is expressed as a virtual relational expression T = f ₂ (X ₂ ) in which reference detection values X ₂₁ and X ₂₂ are dotted in a straight line. .

The parameter function storage unit 5 is previously provided with a relational expression Y = g (D) of a parameter Y relating to the diameter or thickness D and rigidity of a long object of the same kind as the measured long object.

In the first calculation unit 6, the diameters or thicknesses D ₁ and D _{2 of} the reference long object and the diameters or thicknesses D ₀ of the long object to be measured are related to the corresponding parameters Y ₁ , Y ₂ and Y ₀ , respectively. Formula Y = g
It is calculated based on (D). The calculation process is represented by the relational expression Y = g (D) in the DY coordinates shown in FIG.

Further, in the first calculation unit 6, the diameter or thickness D
_Based on the reference detection values X ₁₁ , X ₁₂ and X ₂₁ , X ₂₂ relating to the reference long object of ₁ and D _2, the measured length having the diameter or the thickness D ₀ based on the parameters Y ₁ , Y ₂ and Y _0. The virtual detection value X ₀₁ when the reference tension T ₁ of the scale is applied is calculated by the formula X ₀₁ = (X ₂₁ −X ₁₁ ) (Y ₀ −Y ₁ ) / (Y ₂ −
Y ₁ ) + X _{11 and} the virtual detection value X ₀₂ when the reference tension T ₂ is applied are calculated as X ₀₂ = (X ₂₂ −X ₁₂ ).
(Y ₀ −Y ₁ ) / (Y ₂ −Y ₁ ) + X _{12 is} proportionally proportionally interpolated or extrapolated, respectively, and the linear expression of the linear stapling of the detected value X ₀ and the tension T is T = f. ₀
(X ₀ ) is obtained. The process of the interpolation or extrapolation is shown in FIG.
It is expressed together with the relational expression T = f ₀ (X ₀ ) in the XT coordinate shown in FIG.

Then, in the second operation section 7, the tension T _{i is set} as the variable X ₀ based on the relational expression T = f ₀ (X ₀ ) as the detection value X _i detected by the load detection section 1.
Is calculated and output via the output display unit 8 as necessary. The calculation process is represented by the XT coordinate shown in FIG.

It should be noted that, in the above-mentioned arithmetic structure, in order to facilitate understanding, two reference tensions T ₁ and T 2 are provided for two reference elongated members having different diameters or thicknesses D ₁ and D ₂ .
The case where the reference detection value at the time of the action of T ₂ is stored in the data storage unit 4 as the required data is shown. However, in order to further improve the measurement accuracy, the reference long object of 3 or more articles and 3 More than one reference tension may be adopted individually or in combination, and when three or more reference long articles are adopted, an appropriate two reference long articles are selected in the above calculation.

FIG. 3 is a schematic front view of the inside of the tension measuring device shown in FIG. In the figure, the tension detecting unit 2 is provided on the top of the case 11, and the tension detecting unit 2 is provided.
Includes a contactor 13 formed of a sensing roller between the two guide rollers 12.
Is provided on the support body 14 via the compression spring 15 and is urged downward so as to be displaceable upward by the operation of the handle 16, and the contact 13 is distorted in the shape of a hollow quadrilateral installed in the case 11. It is connected to the pressure receiving portion 17 of the load detection unit 1 formed of a gauge type load cell, and a long object 18 to be measured is wound around the guide roller 12 and the sensing roller 13 in an S shape.

A thickness gauge 19 having the same thickness as the diameter or thickness of the long object 18 to be measured is sandwiched between the support 14 of both guide rollers 12 and the case 11. Is displaced upward by the above-mentioned thickness. These constitute a known bending angle correction device so that the bending angle θ of the measured long object 18 wrapped around the contact 13 is not affected by the change in the diameter or thickness of the measured long object 18. .

Further, the support 14 of both guide rollers 12 is provided with a diameter or thickness detection setting section 3 which comprises a position detection device, and this detects the thickness of the thickness gauge 19 sandwiched in the bending angle correction device. It is detected as the diameter or thickness of the measured long object 18.

It is to be noted that the above-mentioned arithmetic components and the power supply device for driving them are omitted in FIG.

[0030]

Since the method and apparatus for measuring the tension according to the present invention are configured as described above, the occurrence of the measurement error due to the rigidity of the long object to be measured can be eliminated and the tension can be obtained from the detected value. It is possible to greatly simplify the calculation processing for this by adopting proportional linear interpolation or extrapolation, linear approximation by linear point-stamping, and the like, and to reduce the work of inputting data to the storage device.

The relational expression Y = g (D) is Y = D ^{2.7 to} D ^4.5.
In the range selected from the above range, it is possible to obtain the calculated value of the tension which is almost equal to the measured value.

[Brief description of drawings]

FIG. 1 is a block diagram showing a calculation configuration of a tension measuring method and apparatus according to an embodiment of the present invention.

FIG. 2 is a graph diagram for explaining, on coordinates, a calculation configuration of the tension measuring method and apparatus shown in FIG.

FIG. 3 is a schematic front view of the inside of the tension measuring device shown in FIG.

[Explanation of symbols]

 1 load detection unit 2 tension detection unit 3 diameter or thickness detection setting unit 4 data storage unit 5 parameter function storage unit 6 first calculation unit 7 second calculation unit

Claims (3)

[Claims] 1. A method for measuring tension in which a tension component force generated by bending of a long object to be measured is detected to calculate the tension, and a diameter or thickness D _{1 of the} same type as the long object to be measured and different from each other. reference detection value are respectively detected upon action of the plurality of reference tension T ₁ through T _n for a plurality Article reference long product having a ~D _k X ₁₁ ~X _1n to X _k1
˜X _kn and the relational expression Y = g of the parameter Y related to the diameter or the thickness D and the rigidity of a long object of the same kind as the measured long object.
(D) is stored, and parameters Y _a and Y _b corresponding to the diameters or thicknesses D _a and D _b and the diameter or thickness D ₀ of the two reference elongated objects among the plurality of articles and the measured elongated object, respectively. And Y ₀ is a relational expression Y
= Calculated based on g (D), diameter or thickness D _a, reference detection value according to the reference long of D _b X _a1 ~X _an and X _b1 to X _bn
From the parameters Y _a , Y _b and Y ₀ , the virtual detection values X _{01 to} X _0n relating to the long object to be measured having the diameter or the thickness D ₀ to be detected when the reference tensions T _{1 to} T _n are applied are proportional. relationship apportioning to inner挿又detection value by Tentei them linearly with extrapolation X ₀ and the tension T formula T = f ₀ (X
₀ ), and the tension T _i is calculated based on the relational expression T = f ₀ (X ₀ ) with the variable X ₀ as the detection value X _i . 2. A tension measuring device for detecting a component force of a tension generated by bending a long object to be measured to calculate the tension, the tension having a movable contact for contacting the long object to be measured. The component force of the tension applied to the detector and the contact of the tension detector is detected value X _i
As a load detection unit, a diameter or thickness detection setting unit that detects or sets the diameter or thickness D ₀ of the measured long object, and a diameter or thickness D _{1 to} D _{k of the} same type as the measured long object and different from each other.
Data storage for storing reference detection values X _{11 to} X _{1n to} X _{k1 to} X _kn respectively detected by the load detection unit when a plurality of reference tensions T _{1 to} T _n are applied to a plurality of reference elongated objects having And a relational expression Y of a parameter Y related to the diameter or the thickness D and the rigidity of the long object of the same kind as the long object to be measured.
= G (D) and the parameter function storage unit respectively correspond to the diameters or thicknesses D _a and D _b of the two reference elongated objects in the plurality of articles and the diameter or thickness D ₀ of the measured elongated object. Parameter Y
_a , Y _b and Y ₀ are calculated based on the relational expression Y = g (D), and reference detection values X _{a1 to} X _an and X _{b1 to} X relating to the reference long object having the diameter or the thickness D _a and D _b. parameters Y _a from _bn, Y _b
And the virtual detection values X _{01 to} X _0n relating to the long object to be measured having the diameter or the thickness D ₀ to be detected by the load detecting unit when the reference tensions T _{1 to} T _n are applied based on Y ₀ and Y _0. A first calculation unit for interpolating or extrapolating and linearly stippling them to obtain a relational expression T = f ₀ (X ₀ ) between the detected value X ₀ and the tension T, and a relational expression T = f ₀ (X _The tension measuring device is provided with a second calculation unit that calculates the tension T _i using the variable X ₀ as a detection value X _i detected by the load detection unit based on ₀ ). 3. The relational expression Y = g (D) is Y = D ^{2.7 to} D
The tension measuring device according to claim 1, which is selected from the range of ^4.5 .