JP2006038646A - Electric resistance measuring device of conductive sheet body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric resistance measuring device of a conductive sheet body capable of measuring stably and accurately the electric resistance of the conductive sheet body during conveyance, and capable of measuring without damaging the conductive sheet body. <P>SOLUTION: This device has a constitution wherein current supply electrode parts 3a/3b are arranged on both ends of a measuring guide roll 2, and voltage measuring electrode parts 5a/5b are arranged between the current supply electrode parts 3a/3b, and the four electrode parts are mutually insulated by a core body 9. A constant current is made to flow from a constant current source 12 into the conductive sheet body 14 in contact with the current supply electrode parts 3a/3b through current supply terminals 4a/4b, and a voltage drop between the voltage measuring electrode parts 5a/5b is measured by a voltmeter 11 through voltage measuring terminals 7a/7b, and the electric resistance value of the conductive sheet body 14 is measured continuously during conveyance from the measured voltage value and the constant current value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a device for measuring electrical resistance of a conductive sheet. More specifically, the present invention relates to an electrical resistance measurement device that continuously measures electrical resistance while conveying a conductive sheet.

  Examples of the conductive sheet include woven and knitted fabrics made of conductive fibers such as metal fibers, and conductive films that have been subjected to metal plating. Very often, continuous measurements of electrical properties, particularly electrical resistance, are required during transport. As a method for measuring the electrical resistance of the conveyed conductive sheet, for example, there is a method of directly contacting a measuring rod-shaped measuring element used in a tester with the conveyed conductive sheet, but in this method, Since wrinkles and unevenness occur in the conductive sheet body, a stable electrical contact state cannot be maintained, and an accurate measurement value cannot be obtained, and the conductive sheet body may be damaged.

Therefore, various measures for coping with such problems have been proposed. For example, in Patent Document 1, a running conductive film is disposed on the surface of a measurement guide roll having both ends insulated perpendicularly to an axis so that the resistance measurement surface is in contact with the both ends. A method is described in which a voltage is applied as two electrodes and a current is measured to measure the resistance between the electrodes, which is used as the resistance of the conductive film. Further, in Patent Document 2, when the electrical resistance in the longitudinal direction of the conductive fiber is continuously measured, the contact resistance between the conductive fiber and the contact is obtained by incorporating the principle of the four-terminal method into the measurement circuit. A method of eliminating the influence and measuring with high accuracy is described. More specifically, the first and fourth energization means are driven by sequentially contacting the conductive fibers with four energization means arranged in series (comprising a metal roll or the like serving as a contact). An electric current is supplied to the conductive fiber through the wire, and the current supplied to the conductive fiber is measured. At the same time, a voltage drop generated in the conductive fiber is measured via the second and third energizing means arranged between the first and fourth energizing means. And the electrical resistance of the conductive fiber between the 2nd and 3rd electricity supply means is calculated | required from the voltage value corresponding to the said voltage drop, and the said electric current value.
Japanese Patent Application Laid-Open No. 11-148953 JP 2001-221819 A

  In Patent Document 1 described above, since the measuring element is brought into contact with the roll in contact with the conductive film, the measuring element does not directly contact the conductive film and does not damage the measuring surface. In order to measure the electrical resistance, it is necessary that the contact between the conductive film as the object to be measured and the roll is always stable. However, actually, the contact pressure and contact area between the conductive film and the roll change with time, and the contact resistance between the conductive film and the roll changes. The fluctuation of the contact resistance affects the measurement, and an accurate electric resistance cannot be obtained.

  Further, in Patent Document 2, when the mechanical structure is complicated such that the apparatus used for the measurement method requires four metal rolls in the longitudinal direction, and the conductive fibers are in sheet form, the electrical resistance in the width direction Cannot be measured structurally. Therefore, the measurement of the electrical resistance in the width direction, which is important for the measurement of the conductive sheet body, is not assumed.

  Therefore, the present invention provides an electrical resistance measuring device for a conductive sheet body that can stably and accurately measure the electrical resistance of the conductive sheet body to be conveyed and can measure without damaging the conductive sheet body. It is intended to do.

  The electrical resistance measuring apparatus for a conductive sheet according to the present invention is provided with a pair of current supply electrode portions on the outer peripheral surface of a guide roll pressed against the conductive sheet being conveyed and a pair of current supply electrode portions between the current supply electrode portions. A voltage measurement electrode unit is provided, and a current value supplied between the current supply electrode unit and the voltage measurement electrode unit measured in a state where the conductive sheet body is in electrical contact with each electrode unit. An electrical resistance measuring device for a conductive sheet body that measures an electrical resistance value of the conductive sheet body based on a voltage value applied, wherein each electrode portion is predetermined in the axial direction along the outer peripheral surface of the guide roll. The conductor is exposed over the entire circumference with a width of, and between each electrode portion, the insulator is exposed over the entire circumference with a predetermined width in the axial direction along the outer peripheral surface of the guide roll. It is formed. Furthermore, the width of the voltage measurement electrode part is set to be equal to or less than the width of the insulator between the voltage measurement electrode parts. Furthermore, a rotating shaft made of a conductor projects from both ends of the guide roll, and a ring-shaped conductive member is fixed to the rotating shaft via an insulator, and the current supply electrode portion is Each of the rotating shafts is electrically connected to one of the rotating shafts, and each of the voltage measuring electrode portions is electrically connected to one of the conductive members, and a current supply terminal is in sliding contact with the rotating shaft. The voltage measuring terminals are arranged in sliding contact with the conductive members.

  By having the configuration as described above, a pair of current supply electrode portions are provided on the outer peripheral surface of the guide roll pressed against the conductive sheet conveyed, and a pair of voltage measurement electrode portions are provided between the current supply electrode portions. Providing a current value supplied between the current supply electrode parts and a voltage value measured between the voltage measurement electrode parts in a state where the conductive sheet body is in electrical contact with each electrode part. Since the electrical resistance value of the conductive sheet body is measured based on this, it can be measured with a circuit configuration equivalent to the four-terminal method, and high-accuracy measurement is possible.

  Further, each electrode portion is formed by exposing the conductor over the entire circumference with a predetermined width in the axial direction along the outer circumferential surface of the guide roll, and between each electrode portion, the outer circumferential surface of the guide roll is formed. Since the insulator is exposed and formed over the entire circumference with a predetermined width in the axial direction, the respective electrode portions are arranged along the axial direction of the guide roll, and the axial direction of the guide roll—that is, the conveyance It is possible to measure the electrical resistance in the width direction of the conductive sheet body.

  Moreover, since the width of the voltage measurement electrode part is set to be equal to or less than the width of the insulator between the voltage measurement electrode parts, fluctuations in the measured voltage value can be suppressed. That is, when the width of the voltage measurement electrode portion is wide, the measured voltage value is the average of the voltage values measured at various measurement distances set between the contact portions of the two electrode portions with the conductive sheet body. As a result, the fluctuation increases accordingly. Therefore, it is preferable that the voltage measurement electrode portion has a narrow width. However, when the width is narrow, the contact state with the conductive sheet body becomes unstable. Therefore, by setting the width of the voltage measurement electrode portion to be equal to or less than the width of the insulator between the voltage measurement electrode portions, it becomes possible to stably measure the voltage while suppressing the fluctuation of the voltage value.

  Then, a rotating shaft made of a conductor is provided at both ends of the guide roll, and a ring-shaped conductive member is fixed to the rotating shaft via an insulator, and the current supply electrode portion is electrically connected to one of the rotating shafts. The voltage measurement electrode part is electrically connected to one of the conductive members, and the current supply terminal is slidably contacted with the rotating shaft and the voltage measurement terminal is slidably contacted with the conductive member. By providing, it can measure, without damaging a conductor sheet | seat body. That is, both the current supply terminal and the voltage measurement terminal are disposed on the rotating shaft portions protruding from both ends of the guide roll, and are located at positions away from the outer peripheral surface of the guide roll that the conductor sheet body contacts. Therefore, the current between the voltage measurement electrode portions can be measured by supplying current to the current supply electrode portion without affecting the conductor sheet body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 shows a schematic perspective view of an embodiment according to the present invention. The electrical resistance measuring device 1 includes a measurement guide roll 2 having an electrode portion as described later, and a resistance measuring device 10 having a voltmeter 11 and a constant current source 12, and the conductive sheet body 14 is It is conveyed in the direction of the arrow by a sheet conveying device (not shown). The conductive sheet body 14 is wound around the measurement guide roll 2 and conveyed while changing the conveyance direction, and the electric resistance value is measured by the electric resistance measurement device 1 in a state of being in close contact with the measurement guide roll 2.

  FIG. 2 is a schematic cross-sectional view of the cross section passing through the rotation axis of the measurement guide roll 2 as seen from the direction AA. The measurement guide roll 2 is provided with four electrode portions on the outer peripheral surface of a core body 9 made of an insulating synthetic resin material. A pair of current supply electrode portions 3a and 3b are disposed at both ends of the core body 9, and a pair of voltage measurement electrode portions 5a and 5b are disposed between the current supply electrode portions 3a and 3b. Yes.

  When at least one of the guide rolls such as the winding guide roll and the turn guide roll disposed in the manufacturing apparatus or the inspection apparatus of the conductive sheet body 14 is replaced or modified with the measurement guide roll 2 and used. Good.

  The current supply electrode portions 3 a and 3 b are configured by molding a metal material into a cylindrical shape, and the metal surface is exposed with a predetermined width over the entire circumference of the measurement guide roll 2. The outer ends of the current supply electrode portions 3a and 3b are closed, and shaft bodies 15a and 15b are projected along the rotation axis direction. The shaft bodies 15a and 15b are made of metal together with the current supply electrode portions 3a and 3b. It is integrally molded with materials.

  The voltage measurement electrode portions 5a and 5b are also formed by molding a metal material into a cylindrical shape, and the metal surface is exposed with a predetermined width over the entire circumference of the measurement guide roll 2. Between the four electrode portions, the core body 9 is exposed with a predetermined width over the entire circumference of the measurement guide roll 2, and the exposed surface of each electrode portion and the exposed surface of the core body 9 are The joints are formed without any step so as to form a cylindrical outer peripheral surface as a whole. Since the core body 9 is an insulator, each electrode part is in an electrically insulated state.

  As the shape of the electrode portion, a cylindrical shape other than the cylindrical shape can be used. The shape of the other parts is not particularly limited as long as the outer peripheral surface is exposed with a predetermined width. As the metal material used for the electrode part, stainless steel having excellent corrosion resistance against inorganic chemicals and organic solvents is preferable.

  The shape of the core may be formed integrally or may be divided and combined. Further, it can be formed in a cylindrical shape or a cylindrical shape. As the insulating material used for the core, a resin material such as polyacetal having excellent corrosion resistance is also preferable.

  Ring-shaped insulators 16a and 16b made of an insulating synthetic resin material are fitted and fixed to the shaft bodies 15a and 15b, respectively. 6a and 6b are fixed. The conductive member 6a is electrically connected to the voltage measurement electrode portion 5a through a metal wire 8a disposed through the core body 9. Since the metal wire 8a is covered with an insulating film, only the conductive member 6a and the voltage measuring electrode portion 5a are electrically connected. Similarly, the conductive member 6b is electrically connected to the voltage measurement electrode portion 5b through a metal wire 8b disposed through the core body 9.

  The current supply terminals 4a and 4b are in contact with the shaft bodies 15a and 15b, respectively, and the voltage measurement terminals 7a and 7b are in contact with the conductive members 6a and 6b, respectively. Therefore, when the measurement guide roll 2 is rotated while the conductive sheet body 14 is being conveyed, each terminal is in a state of sliding contact with the shaft body or the conductive member, and maintains an electrically connected state. Yes. Each terminal may be configured so that, for example, a rod-shaped conductor is pressed against the shaft body or the conductive member by a biasing means such as a spring.

A constant current source 12 is connected to the current supply terminals 4a and 4b, and a voltmeter 11 is connected to the voltage measurement terminals 7a and 7b. FIG. 3 shows the above configuration with an equivalent circuit. That is, in a state where the conductive sheet body 14 is in close contact with the measurement guide roll 2, each electrode portion is in a state of being electrically connected via the conductive sheet body 14, and as shown in FIG. The circuit configuration is the same. The path of the constant current i flowing from the constant current source 12 is as follows: current supply terminal 4a → shaft body 15a → current supply electrode portion 3a → conductive sheet body 14 → current supply electrode portion 3b → shaft body 15b → current supply terminal 4b. The voltage measurement terminal 7a is connected to the conductive member 6a → the metal wire 8a → the voltage measurement electrode portion 5a, and the voltage measurement terminal 7b is connected to the conductive member 6b → the metal wire 8b → the voltage measurement electrode portion 5b to obtain the voltage measurement electrode. The electric resistance value of the conductive sheet 14 between the parts 5a and 5b can be measured by the four-terminal method. In the case of the 4-terminal method, since the internal resistance of the voltmeter is set very high, all the current supplied from the constant current source 12 flows through the conductive sheet body. The electric resistance value can be obtained from the current value i flowing from the constant current source 12 and the voltage value V measured by the voltmeter 11 by the following equation.
R = V / i

  As a method for measuring the electrical resistance value of such a conductive sheet body, there is a measurement method defined in JIS K 7194. In this measurement method, a method for testing the resistivity of conductive plastics by a four-probe method is defined, and the conductive plastic is a test piece of 80 mm × 50 mm, and its thickness is defined as 20 mm or less. Therefore, it is used as a standard measuring method for the electric resistance value of the conductive sheet body.

  In this embodiment, as demonstrated in the examples to be described later, since the electrical resistance value is measured with the circuit configuration of the four-terminal method using the above-described configuration of the electrode portion, high-precision measurement can be stably performed. The measurement result has a good correlation with the measurement result according to the above JIS standard. In particular, since the widths Da and Db of the voltage measuring electrode portions 5a and 5b are set to be equal to or less than the distance d between the voltage measuring electrode portions 5a and 5b, the conductive properties are obtained in a very stable manner. By continuously measuring the electric resistance value during conveyance of the conductive sheet body, it is possible to easily calculate a measurement value very close to the measurement result according to the standard JIS standard from the correlation obtained in advance. Therefore, since a highly accurate measurement value is obtained continuously, a fine quality check of the conductive sheet body can be easily performed, which contributes to an improvement in the quality of the conductive sheet body. When the widths Da and Db of the voltage measuring electrode portions 5a and 5b are large, the measured voltage value was measured at various measurement distances set between the contact portions of the two electrode portions with the conductive sheet body. Since the voltage value becomes an average value and the fluctuation increases accordingly, the width of the voltage measurement electrode portion is preferably narrow. However, when the width is narrowed, the contact state with the conductive sheet body becomes unstable. Therefore, the widths Da and Db are preferably set to 3% to 50% of the distance d, and more preferably set to 5% to 10%.

  In addition, since such a highly accurate measurement value can be obtained in real time during the conveyance of the conductive sheet body, it becomes possible to change the manufacturing process of the conductive sheet body in accordance with the variation of the measurement value. For example, when the electrical resistance value is increased, the conveyance speed of the conductive sheet can be adjusted in order to increase the immersion time in a plating tank that imparts conductivity by metal plating.

  In addition, since the current supply terminals 4a and 4b and the voltage measuring terminals 7a and 7b are respectively disposed on the shaft bodies 15a and 15b, these terminals do not contact the conductive sheet body and are used for transporting the conductive sheet body. Measurement can be performed stably without any trouble.

  Moreover, as the electroconductive sheet body 14 used as a measuring object, if it is a sheet-like thing which has the electroconductivity which can measure resistance by said JIS specification, it can measure. For example, a conductive film is formed on the surface of a cloth made of conductive fibers, a cloth made of non-conductive fibers, a conductive film formed on the fiber surface, a cloth made of non-conductive fibers, or a resin film. There is no particular limitation. Further, the material of the fiber or film may be any material and does not depart from the object of the present invention. In particular, in the case of the present invention, even if it is difficult to contact the probe stably, such as a woven or knitted fabric in which a mesh is formed, it can be measured stably.

  The measurement results using the measuring apparatus according to the present invention will be described below.

[Example 1]
A milliohm high tester 3220 (manufactured by Hioki Electric Co., Ltd.) was used as the resistance measuring instrument 10 using the electrical resistance measuring apparatus 1 shown in FIG. The voltage generated between the voltage measurement electrode portions 6a and 6b (width 10 mm) is applied to the current supply electrode portions 3a and 3b from the internal constant current source of the resistance measuring instrument 10 through the current supply terminals 4a and 4b. The resistance value was calculated from the applied current value and the measured voltage value. The following conductive fabric A was used as the conductive sheet.

<Conductive fabric A>
Both warp and weft are made of polyethylene terephthalate multifilament yarn (56 dtex / 72f), and the copper surface is coated by electroless plating on the fiber surface of a plain woven fabric with a warp density of 155 yarns / inch and a weft density of 118 yarns / inch. And a nickel film laminated by electroless plating. Length 100m. Width (length in a direction perpendicular to the longitudinal direction) 134 cm.

Measurement positions were determined at intervals of 10 m from 10 m to 90 m in the longitudinal direction of the conductive fabric A, and the following two set values were changed to calculate an electrical resistance value at each measurement position.
(1) Winding angle θ with respect to the roll (correlation with the contact area with the roll)
90 degrees (contact area 7.85 cm ² )
120 degrees (contact area 10.47 cm ² )
(2) Tension F applied to the conductive sheet (correlation with the contact pressure on the roll surface)
FIG. 4 shows the measurement results under the measurement conditions set in 8 steps between 2.2 kgf and 14.6 kgf.

[Comparative Example 1]
In Example 1, both the internal voltmeter and the internal constant current source are connected to the voltage measuring terminals 7a and 7b, and are intentionally set to measure by the two-terminal method. Other conditions are the same as in Example 1. Measurement was performed with setting. The measurement results are shown in FIG.

[Test Example 1]
At the measurement position set in Example 1, the conductive fabric A between the voltage measurement electrode portions was cut according to JIS standard (JIS K 7194) to create a test piece, which was a low resistance of Loresta-EP MCP-T360 ESP type. Resistance was measured by a four-probe method using a rate meter (manufactured by Mitsubishi Chemical Corporation). The measurement results are shown in FIG. 6 together with the average value of the electrical resistance value measured in Example 1 and the average value of the electrical resistance value measured in Comparative Example 1.

  As is clear from comparison between FIG. 4 and FIG. 5, the resistance measurement value measured in Example 1 is not affected by variations in contact area with the guide roll and tension, and stable measurement results are obtained. Obtainable. Further, as shown in FIG. 6, when compared with the resistance measurement value measured in Test Example 1, the resistance value measured in Example 1 has a high correlation with the value in Test Example 1, and the present invention By using such a measuring device, it is possible to obtain the electrical resistance value of the conductive sheet body with the same high accuracy as the low resistivity meter using the four-probe method. Since the conductive sheet can be continuously measured while being conveyed, the measurement work by the low resistivity meter using the four-probe method that has been used in the conventional inspection process is greatly simplified. Is possible.

  The measurement results when the width of the voltage measurement electrode unit is changed in the measurement apparatus according to the present invention will be described below. The conductive sheet used in this example is as follows.

<Conductive fabric B>
Both the warp and weft are made of polyethylene terephthalate multifilament yarn (56 dtex / 72f), and the copper surface is coated by electroless plating on the fiber surface of a plain woven fabric having a warp density of 152 yarns / inch and a weft density of 125 yarns / inch. And a nickel film laminated by electroless plating. Length 300m. Width 135cm.

[Example 2]
Using the same measurement apparatus as in Example 1, the distance d between the pair of voltage measurement electrode portions was set to 100 mm, and the electrode widths Da and Db were set to 10 mm and 100 mm. The conductive fabric B was set as a conductive sheet body so as to be wound around the guide roll 90 degrees, and a tension of 8.2 kgf was applied. The measurement was performed by fixing the conductive fabric B, manually rotating the guide roll by 90 degrees and sliding it on the conductive fabric B, and changing the contact position of the guide roll. When the electrode width was 10 mm, the contact area between the electrode portion and the conductive fabric B was 7.85 cm ² , and when the electrode width was 100 mm, it was 78.5 cm ² . The measurement results are shown in FIG.

  As is apparent from FIG. 7, when the electrode width is 10 mm and 100 mm, the measurement can be stably performed even if the contact position of the guide roller with respect to the conductive fabric changes. In particular, it can be seen that the case of 10 mm is more stable than the case of 100 mm.

  The correlation between the measurement result when the width of the voltage measurement electrode unit is changed in the measurement apparatus according to the present invention and the measurement result based on the JIS standard (JIS K 7194) will be described below. The conductive sheet used in this example is the conductive fabric B used in Example 2 and the following two conductive fabrics.

<Conductive fabric C>
Both warp and weft are made of polyethylene terephthalate multifilament yarn (56dtex / 72f), and copper coating is applied to the surface of plain woven fabric with warp density of 180 / inch and weft density of 120 / inch by electroless plating. And a nickel film laminated by electroless plating. Length 300m. Width 100cm.

<Conductive fabric D>
Both warp and weft are made of polyethylene terephthalate monofilament yarn (13 dtex), and a copper film is formed by electroless plating on the surface of a plain woven fabric having a warp density and a weft density of 136 yarns / inch. Length 300m. Width 145cm.

[Example 3]
Using the same measuring apparatus as in Example 2, the conductive fabrics B to D were measured at intervals of 10 m while being sequentially conveyed. First, the measuring device sets the width of the voltage measuring electrode section to 10 mm, measures at the measurement positions of 10 m, 20 m, and 30 m of the conductive fabric, and then changes the width of the voltage measuring electrode section of the measuring apparatus to 100 mm. And it measured in the measurement position of 40m, 50m, and 60m of conductive textiles. In addition, the winding angle with respect to the roll, the contact area with the electrode, and the tension applied to the conductive fabric were set to be the same as those in Example 2.

[Test Example 2]
Next, at each measurement position from 10 m to 60 m from the conductive fabric, the conductive fabric between the voltage measurement electrode portions was cut according to the JIS standard (JIS K 7194) to create a test piece. Resistance was measured by the probe method.

  The measurement results of Example 3 and Test Example 2 are shown in FIG. As is apparent from FIG. 8, when the electrode width is 10 mm and 100 mm, the measured values of Example 3 and Test Example 2 of each conductive fabric have a very good correlation, which affects the type of sheet body and the conveying operation. It can be seen that a highly accurate resistance value can be measured stably without receiving. In addition, when the electrode width is 10 mm and 100 mm, there is more variation in 100 mm. Therefore, when the electrode width is larger than the interval (100 mm) between the voltage measurement electrode portions, the variation becomes larger. Therefore, it is considered that the error from the measured value by the 4-probe method becomes large. Therefore, it is desirable to set the electrode width of the voltage measurement electrode portion to be equal to or less than the interval. When the electrode width is 10 mm, highly correlated data is obtained, and it is considered that more stable data can be obtained when the electrode width is narrow. However, when the electrode width is narrowed, the contact state with the conductive fabric is reduced. In view of these points, the width is preferably 5 mm to 10 mm.

It is a schematic perspective view regarding embodiment which concerns on this invention. It is a schematic sectional drawing seen from AA of the axial direction of a roller in FIG. It is a circuit diagram which shows the equivalent circuit of this embodiment. 3 is a graph showing measurement results regarding Example 1. 10 is a graph showing measurement results regarding Comparative Example 1. It is a graph which compares the measurement result of Example 1, the comparative example 1, and the test example 1. FIG. 6 is a graph showing measurement results regarding Example 2. It is a graph which shows the correlation of the measurement result of Example 2 and Test Example 2.

Explanation of symbols

1 Electrical Resistance Measuring Device 2 Guide Roll for Measurement
3a Current supply electrode
3b Current supply electrode 4 Current supply terminal
5a Voltage measurement electrode
5b Voltage measurement electrode
6a Conductive member
6b Conductive member 7 Voltage measurement terminal
8a metal wire
8b Metal wire 9 core
10 Resistance measuring instrument
11 Voltmeter
12 Constant current source

Claims (3)

  A pair of current supply electrode portions are provided on the outer peripheral surface of the guide roll that is in pressure contact with the conveyed conductive sheet body, and a pair of voltage measurement electrode portions are provided between the current supply electrode portions. The electrical resistance of the conductive sheet body based on the current value supplied between the current supply electrode parts and the voltage value measured between the voltage measurement electrode parts in a state of being in electrical contact with the part An electrical resistance measuring device for a conductive sheet body for measuring a value, wherein each electrode portion is formed by exposing the conductor over the entire circumference with a predetermined width in the axial direction along the outer circumferential surface of the guide roll. And an insulating material is exposed between the electrode portions along the outer peripheral surface of the guide roll in the axial direction with a predetermined width over the entire circumference. Resistance measuring device.   2. The electrical resistance measurement apparatus for a conductive sheet according to claim 1, wherein a width of the voltage measurement electrode portion is set to be equal to or less than a width of an insulator between the voltage measurement electrode portions.   Rotating shafts made of a conductor project from both ends of the guide roll, and ring-shaped conductive members are fixed to the rotating shafts via insulators, respectively, and the current supply electrode portions are respectively The voltage measuring electrode portion is electrically connected to one of the conductive members, and the current supply terminal is slidably in contact with the rotating shaft. The electrical resistance measuring device for a conductive sheet according to claim 1, wherein a voltage measuring terminal is slidably contacted with each of the conductive members.

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