JPH10125151A - Stranding period detecting method for stranded cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure and inspect the stranding period of a cable in the stranding process without measuring with a sample. SOLUTION: A signal is given only to a specific objective insulating electric wire of a plurality of insulating electric wires of a stranded cable 10, while the cable 10 during stranding is moved in the axial direction, the variation of electromagnetic or electrostatic effect on the environment given by the signal of the objective insulating electric wire is detected with a sensor 11 approached to the outer surface of the stranded cable 10. The variation of the separated distance between the sensor 11 and the objective insulating electric wire stranded in the stranded cable 10 is detected, and the stranding period of the objective insulating electric wire is computed and detected based on the detected variation of separated distance and the moved length in the axial direction of the stranded cable 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a twist period of a twisted cable including an inverted twisted cable in which an insulated wire is repeatedly inverted at a predetermined cycle in a twisted cable.

[0002]

2. Description of the Related Art Generally, in a communication field such as a telephone line, a CCP (Color Coded Pol) shown in FIGS.
A local communication cable (CCP cable) made of yethylene (color identification polyethylene) is often used.

This CCP cable has a diameter of 0.4 mm.
A colored polyethylene insulation is applied to the outer periphery of the soft copper wire of about 0.9 mm to form an insulated element wire 1, which is arranged in a square shape with four cross sections and twisted to form a two-paired quad 2.
The subunits 3 are formed by combining these with five quads (10 pairs) and roughly bundling them with a thin colored resin tape. Then, this is twisted by a required number to form a predetermined logarithm, and a protective upper winding tape 4 made of resin is wound around the outer periphery thereof to bundle a group of insulated wires to form a cable core 5.

In the twisting (assembling) step, the subunits 3 are spirally wound in one direction over the entire length and assembled.
"One-way twist" can be adopted, but "Left and right alternate twist" or "S", such as repeatedly reversing the twisting direction at a constant cycle length over the entire length of the cable core, can be adopted.
In many cases, a method called “Z twist” is adopted.

[0005] The outer periphery of the cable core 5 which is formed by inverting at a constant cycle in this manner has a length of about 0.2 m for electrostatic shielding.
m thick aluminum tape 6 into a pipe shape at both ends 6a,
6b, and an outer coating (sheath) of black polyethylene or the like having good weather resistance on carbon is applied thereon.
In a cylindrical shape with a required thickness. At this time, the lower pipe-shaped aluminum tape 6 is thermally fused to the inner surface of the polyethylene sheath 7 by the heat generated when the polyethylene sheath 7 is applied. In this way, a high-strength composite structure sheath (LAP sheath: Laminated sheath) in which the aluminum tape 6 and the polyethylene sheath 7 are integrated on the cable core 5
Aluminum Polyethylene) is applied to complete the CCP cable.

The SZ twist is characterized in that the right twist and the left twist are alternately twisted adjacent to each other when viewed in a part, but when viewed as a whole averaged in the length direction of the cable, the right twist is turned right. The twisted portion (+ twist) and the left twisted portion (-twist) cancel each other out, and no twist is applied. If the length of each twisted portion (reversal period length) is relatively short, the sheath 7 can be cut open and the subunit 3 or the quad 2 can be easily pulled out of the cable. As described above, since a slack that can be pulled out for each subunit 3 or quad 2 is provided in the cable, the pulling out operation becomes easy when connection is made at an intermediate portion of the cable.

[0007] In such a CCP cable, it is required that the slack amount of the subunit 3 or the quad 2 satisfies a predetermined standard value. Approximately 4 m samples are sampled at regular intervals, and inspected in the finished product inspection process.

[0008] This inspection is as follows. First, the sheath 7 is stripped off at about 40 mm in the middle of the cable, and the amount of slack when the cable core 5 of the target subunit 3 is pulled out with a force of about 1 kg is measured. It was tested to see if it was met (FIG. 1).

[0009]

As described above, in the prior art, a sample was extracted and sampled and measured after the completion of the cable manufacturing process. In addition, an extra amount of the measurement sample must be manufactured, which increases the cost.

In addition, since the inspection is performed after the manufacture of the cable is completed, the number of steps and time required for the inspection are increased.

Furthermore, if it is found out of the inspection that the standard is out of specification, it is highly likely that the portion other than the sampling location is also out of standard.
In this case, since the inspection is performed after the completion of the cable, it is highly likely that it is already too late, and many defective products may have been manufactured due to delay in adjusting and changing the assembly conditions in the twisting process High in nature.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for detecting a twist period during twisting of a twisted cable, which can reduce the sample cost and the number of inspection steps.

[0013]

Means for Solving the Problems In order to solve the above problems,
The present invention relates to a twisting cycle detecting method for detecting a twisting cycle of the insulated wire with respect to a twisted cable formed by twisting a plurality of insulated wires, wherein the twisted twisted cable is moved in an axial direction. At this time, a signal is given only to a specific target insulated wire to be measured among a plurality of insulated wires of the stranded cable, and the target insulated wire of the target insulated wire is detected by an electrical detection sensor close to the outer surface of the stranded cable. By detecting a change in the electrical influence of the signal on the surroundings, a change in the separation distance between the electric detection sensor and the target insulated wire twisted in the twisted cable is detected, and the detected separation is detected. The twist period of the target insulated wire is calculated and detected based on a change in distance and a moving length of the twisted cable in the axial direction. This makes it possible to easily detect the twisting period for all the cables without extracting and inspecting a sample.

Here, specifically, at least one pair of the insulated wires of the stranded cable is used as the target insulated wire, and a signal generator is connected to one end of the pair of the target insulated wires and the other ends are connected to each other. By forming an electric loop circuit by stranded insulated wires by connecting, using an electromagnetic sensor as the electric detection sensor, the change of the magnetic field caused by giving a signal from the signal generator to the electric loop circuit. Detected by the electromagnetic sensor, on the other hand, the axial movement length of the stranded cable is detected by a predetermined measuring instrument, and the change in the separation distance obtained from the output signal of the electromagnetic sensor and obtained from the measuring instrument. And detecting the twist pitch of the target insulated wire in the twisted cable based on the moving length.

Alternatively, an electrostatic sensor is used as the electrical detection sensor, and the electrostatic sensor detects a change in capacitance generated between the electrostatic sensor and the target insulated wire given the signal. On the other hand, the axial movement length of the stranded cable is detected by a predetermined measuring instrument, and the change in the separation distance obtained from the output signal of the electrostatic sensor and the moving length obtained from the measuring instrument are detected. And detecting the twist pitch of the target insulated wire in the twisted cable.

Here, when the insulated wire is repeatedly inverted and twisted at a predetermined cycle in the twisted cable, not only the twist pitch but also the twist inversion cycle length of the inverted twisted cable is detected. be able to. In this case, a pulse signal is formed based on an output signal from the electrical detection sensor, and a first pulse signal of a first cycle and a second pulse signal of a second cycle longer than the first cycle are formed from the pulse signal. The two pulse signals are separated and taken out from each other, and the first cycle is set as the twist pitch, the second cycle is set as the twist inversion cycle length, and the twist pitch and the twist inversion cycle length are identified and detected. I do.

Specifically, after forming a pulse signal based on an output signal from the electrical detection sensor, the pulse signal is converted into a delay waveform signal by a delay circuit, and the delay signal converted by the delay circuit is converted into a delayed waveform signal. The first pulse signal of the first cycle is extracted by comparing the waveform signal with a first threshold value, and the first pulse signal is extracted from the delayed waveform signal converted by the delay circuit. Second different from the threshold
The second threshold of the second period is compared with the threshold of
What is necessary is just to extract a pulse signal.

When the stranded cable is moved in the axial direction, the stranded cable is moved while being wound by a winding drum of a predetermined winding device.
Connecting the target insulated wire to a first conductive member that rotates with the winding drum; and connecting the second conductive member to a signal generator that supplies a signal to the target insulated wire with the first conductive member. The signal from the signal generator may be given to the target insulated wire through the second conductive member and the rotating first conductive member.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

<< Principle of the Invention >> First, the relationship between the slack amount of the subunit and the quad and the SZ twist pitch will be described. In addition,
In the following description, each element code of the CCP cable exemplified in the conventional description is used as it is. In general, as shown in FIG. 1, the amount of slack when the sheath 7 is cut and the subunit 3 or the quad 2 is taken out is not uniquely determined, but is a cycle in which right-handed twisting and left-handed twisting are alternately reversed. Length (hereinafter referred to as “twist inversion cycle length”) Pr and the subunit 3 or the quad 2 are helically twisted in each of the right-twisted section and the left-twisted section and make one rotation ( 1 cycle) length (hereinafter referred to as “twist pitch”)
Ps and a radius R from the center of the cable core 5 at a position where the subunit 3 or the quad 2 is spirally arranged.
Etc. are determined from various structural dimensions.

More specifically, assuming that there is no parallel portion with respect to the axis of the cable core 5 in the inversion portion of the SZ twist, the twist length of the subunit 3 and the like within each twist inversion cycle length Pr. Assuming that (surplus length) is er, er is expressed in principle by the following equation (1).

[0021]

(Equation 1)

However, the twisted length er cannot be pulled out of the cable core 5 as a total slack. That is, in addition to the above factors Pr, Ps, R,
For example, the pressing force of the upper winding tape 4 on the cable core 5, the force for fastening the cable core 5 by the sheath 7, and the like work as a force for suppressing the drawing out of the twist length er. However, the twist of SZ at the time of SZ twist assembly must be suppressed by the upper winding tape 4 so as not to return. For this reason, it is very important that the subunit 3 and the like are arranged in the twisted arrangement as expected in the cable core 5, and it is continuously confirmed that this state is stable over the entire length during the SZ twisted assembly. It is necessary to be able to measure and monitor.

As described above, although it depends on the tightening force of the upper winding tape 4 and the cable core 5 of the sheath 7, the above (1) is generally used.
As shown in the formula, the twist inversion cycle length Pr is large, and the twist pitch P
As s decreases, the amount of slack tends to increase. In addition, when the tension of the cable core 5 of the upper winding tape 4 and the sheath 7 is weaker, the subunit 3 moves more easily when the subunit 3 is pulled out by 1 kg, so that the slack amount increases.

As described above, in the SZ assembling step, the radius R from the cable center at the position where the subunit 3 is twisted,
It is manufactured while adjusting and measuring the twist reversal cycle length Pr and the twist pitch Ps of the one-way twist portion. In particular, the twist reversal cycle length Pr and the twist pitch Ps related to the twist are set in the subunit sent to the SZ twisting device. It may fluctuate with tension of 3, etc.
It is desirable to measure the entire length of the cable core 5 online and control the tape material / size, winding tension, winding pitch, etc. of the upper winding tape 4 on the cable core 5 based on the result.

Therefore, in the present invention, these influential parameters are measured by an SZ set pitch continuous measuring device described later, and control is performed based on the measurement result.
The resulting slack withdrawable amount is managed so as to be within a desired standard.

FIG. 2 is a schematic diagram showing an SZ twisting device C and an SZ assembly pitch continuous measuring device (slack measuring device) A according to a first embodiment of the present invention. FIG. The SZ set pitch continuous measuring device A used here is a C
During the axial movement in the twisting step of the CP cable 10, the twist reversal cycle length Pr and the twist pitch Ps of the subunit 3 or the quad 2 of the CCP cable 10 are set near the side of the cable core 5 during the traveling movement. Sensor 11 provided
From the cable core 5 and a length signal from a separately provided cable length measuring instrument 12 to calculate the cable core 5
It is intended to continuously measure the pattern of the twist reversal cycle length Pr and the twist pitch Ps of the subunit 3 and the like in the above.

1. Configuration of Sensor The above-described sensor 11 is provided by a sensor head 11a provided so as to be electrically or electrostatically or electromagnetically coupled to a specific subunit 3 to which a signal current is supplied, by SZ twist. Specific subunit 3
The change in the distance between the sensor head 11a and the sensor head 11a, that is, the change in the electrical coupling signal due to the twist pitch Ps is taken out.

As such a sensor 11, an electromagnetic detection type and an electrostatic detection type can be considered. Here, an electromagnetic detection type (electromagnetic sensor) is applied. This electromagnetic sensor 11 has a sensor head 11a provided with an electromagnetic coil formed by winding a predetermined insulated wire a plurality of times near the side of the cable core 5. Next, a signal current supply mechanism for sensing, which is a premise of such an electromagnetic sensor 11, will be described.

This signal current supply mechanism, as shown in FIG.
In the CCP cable 10 to be measured, an arbitrary pair or one quad conductor (target insulated wire) 13 (subunit 3 or quad 2) is selected and a signal generator 14 is electrically connected to one end thereof. Thus, a high-frequency signal current can be sent to the conductor 13, and the other end of the conductor 13 is connected and connected to each other by a predetermined conductive member B, so that the signal current from one end of the conductor 13 is connected. Is connected at the other end so that it returns to the signal generator 14 at one end.

More specifically, as shown in FIG.
A pair of insulated wires 15a, which are shielded from each other,
15b are drawn out, and these insulated wires 15a, 15
b is connected to brushes (brushes) 16a and 16b, respectively. On the other hand, one end of the cable core 5 is wound around a drum 19 of a cable core winding device 18 for winding the twisted cable core 5, and the selected one pair or one quad is selected. One end of the conductor 13 is connected to sliding rings (slip rings) 17 a and 17 b which are directly connected to the drum 19 of the cable core winding device 18 and rotate. The brushes 16a and 16b are in slidable contact with the sliding rings 17a and 17b of the cable core winding device 18.

Here, the frequency of the signal to be set in the signal generator 14 avoids the frequency of the noise signal, and practically uses a frequency of about 10 KHz or 1 KHz.

As described above, the signal generator 14 flows the signal current I to the insulated conductor 13 connected to form a reciprocating circuit by the predetermined conductive members B as shown in FIG.

It should be noted that a configuration as shown in FIG. 4 may be employed instead of the configuration shown in FIG. Here, a configuration in which a rotary coupling type transformer (coupling transformer) 21 is used to electromagnetically couple the drum 22 side rotating during the SZ twisting work and the signal generator 14 side stationaryly arranged is used. Has adopted. In this case, reference numerals 20a and 20b in FIG.
The primary coils 20a are fixed on the fixed side, and the insulated wires 15a are in the same manner as in the example of FIG.
a and 15b are connected at points 16a and 16b, the secondary coil 20b is on the rotating side that rotates integrally with the winding drum 21, and at the connection points 17a and 17b in the twisted cable 10 to be measured. Since it is coupled to the pair of conductors 13 to form an electric loop circuit, there is no sliding between the primary coil 20a and the secondary coil 20b, and they are electromagnetically coupled close to each other and can rotate freely. . With this configuration, the pair of conductors 13 is indirectly connected to the signal generator 14.

Now, assuming that the distance between the conductor 13 to which the signal current I is supplied from the signal generator 14 and the sensor head 11a is g (see FIG. 5), the current reciprocates as shown in FIGS. 6 and 7. Since a magnetic field H (∝I / g) is generated around the flowing area, the fluctuation of the magnetic field H generates an excitation power having the same frequency as the signal current I in the sensor head (detection coil) 11 a. It is extracted as a signal.

The voltage Er induced in the magnetically coupled portion of the sensor head 11a is, as shown in FIG.
It is proportional to the magnitude of the mutual inductance M during this time. That is, Er = jωMI, but the mutual inductance M is M∝Log between the reciprocating current circuit formed by the conductor 13 through which the signal flows and the distance g between the sensor head 11a.
There is a relationship of (1 / g), and the mutual inductance M decreases as the distance g between them increases. Therefore, if the twisted pitch of the reciprocating current circuit (subunit 3) that periodically approaches and separates from the sensor head 11a is calculated from the induced voltage and the moving distance of the cable core 5 in the twisted axial direction, The twist pitch of the cable core 5 can be easily obtained. The configuration of the arithmetic circuit for that will be described later.

2. Configuration of Cable Length Gauge The detection result of the sensor 11 described above only detects a temporal change in the detection value due to the twist pitch Ps, and it is necessary to convert such information into length information. Therefore, in order to obtain a pulse signal related to the movement length of the CCP cable 10,
An existing cable length measuring instrument 12 as shown in FIG. 2 is provided. That is, the cable length measuring instrument 12 includes a measuring wheel 28 having a fixed circumferential length that rotates so as not to slide in contact with the SZ-stranded cable core 5. The length of the cable core 5 that has passed under the measuring wheel 28 is determined by counting pulse signals generated at predetermined intervals by a proximity switch or the like (including an optical proximity switch: not shown). It is.

3. Arithmetic circuit Detection signal from sensor 11 and cable length measuring instrument 12
Arithmetic circuit 2 for performing arithmetic processing based on the length signal from
9 is used as shown in FIG. In this circuit, a pulsating circuit unit 31 such as a Schmitt trigger circuit for converting a signal from the sensor 11 into a pulse wave is described.
And a first delay circuit unit 32 that delays the pulse wave from the pulsating circuit unit 31 and separates a twist pitch component and a twist inversion cycle length component by predetermined threshold values Es and Er, respectively. And the second delay circuit unit 33, the component signals for the twist pitch and the twist inversion cycle length obtained from the first delay circuit unit 32 and the second delay circuit unit 33, and the signal from the cable length measuring instrument 12. A first counting section 34 and a second counting section 35 are provided for counting and calculating the twist pitch Ps and the twist reversal cycle length Pr from the measuring signal. And
Each of the counting units is connected to an external predetermined first display unit 36 and second external display unit 37, and a twist pitch P required by the operator.
The information of s and the twist reversal cycle length Pr is displayed so as to be visible. In addition, among the above elements, the first counting unit 34 and the second
Is a functional component in a computer that operates according to a predetermined software program in a general CPU to which a ROM, a RAM, and the like are connected.

<Operation> A measuring method using the SZ set pitch continuous measuring device having the above configuration will be described. First, the existing SZ
When performing the twisting operation of the cable core 5 as shown in FIG. 12A using the twisting device C, a specific insulated wire (subunit or quad: hereinafter referred to as a conductor 13) in the CCP cable 10 being twisted. ) Is continuously applied from the signal generator 14 through the slide transmission units 16 and 17 provided in the cable core winding device 18 or the rotary coupling transformer 21 or the like. At this time, an AC signal of 1 KHz or more is used as an applied signal applied from the signal generator 14 to the conductor 13, and its waveform is as shown in FIG.

Then, the sensor 11 detects a change in the separation distance between the conductor 13 twisted and applied with the high-frequency signal and the sensor head 11a by the above-described electromagnetic detection method. At this time, the sensor head 11a induces and receives a signal voltage having a changed amplitude as shown in FIG. When such a signal voltage is detected, the waveform of the envelope of the peak value of the amplitude of the detection signal is shown in FIG.
1 and FIG. 12B, a signal having such a waveform is obtained as an output from the sensor head 11a.

On the other hand, the moving distance due to the twisting of the cable core 5 during the twisting, that is, the twisting speed is determined by the cable length measuring instrument 12 linked to the movement of the cable core 5 in FIG.
A pulse-shaped measuring signal such as 2 (g) for each unit length (for example, 1 mm) is obtained.

Here, the symbol Ps in FIG.
The symbol Pr indicates a twist inversion cycle length, the symbol Es indicates a threshold value for detecting the twist pitch Ps, and the symbol Er indicates a threshold value for detecting the twist inversion cycle length Pr. Since the fluctuation of the amplitude of the received signal of the sensor head 11a includes the fluctuation of the conductor 13 to be measured 13 in the cable core 5 due to the twist pitch Ps and the fluctuation due to the twist inversion cycle length Pr, FIG. The calculation is performed by the calculation circuit 29. That is,
The signal from the sensor head 11a is converted into a pulse
1 by comparing with a predetermined threshold value (X) as shown in FIG. 12 (b), to form a pulse as shown in FIG. 12 (c), and the first delay circuit unit 32 and the second delay circuit unit 33 And FIG.
After the delay as shown in (d), the pulse signals as shown in FIGS. 12 (e) and 12 (f) are separated by comparing them with two predetermined thresholds (Es, Er). And take it out. Here, FIG. 12E shows a pulse signal synchronized with the twist pitch Ps, and FIG. 12F shows a pulse signal synchronized with the twist inversion cycle length Pr. Using these as gate signals, the first counting unit 34 and the second counting unit 35 count the number of pulses of the measuring signal coming between the gate pulses by a counter, respectively, and measure the unit length of the measuring pulse interval. The first display unit 36 and the second display unit 3
7 for display.

This makes it possible to continuously measure the twist pitch Ps and the twist reversal cycle length Pr measured during the twisting. Therefore, if there is a bias, the twisting speed of the cable core 5, that is, the winding speed of the cable core winding device 18 or the twisting rotation speed of the mesh plate of the SZ twisting device is compared with the predetermined set value. In addition, feedback control can be performed for the inversion cycle and the inversion cycle.
During twisting, a desired twist pitch Ps, SZ
The twist inversion cycle length Pr can be accurately and stably obtained. As a result, the conductor 13 (subunit 3 or quad 2) in the SZ-twisted cable core 5 is given a slack that can be pulled out enough and sufficient for the connection work after the installation.

{Second Embodiment} In the second embodiment,
As the sensor 11 for detecting the influence of the high-frequency signal of the conductor 13 for detecting the twist pitch Ps on the surroundings, an electrostatic detection type (electrostatic sensor) is applied instead of the electromagnetic sensor of the first embodiment. I have. In the case of this electrostatic sensor 11, the conductor 1 constituting the subunit 3 in the cable
Since it is necessary to apply a high-frequency signal current to FIG.
As in 3, around the drum 19 of the cable core winding device 18 similar to the first embodiment, the insulated wire 15a connected to one of the pair of conductors 13 is connected to the voltage application terminal of the signal generator 14. At the same time, the insulated wire 15b connected to the other end of the conductor 13 is grounded,
a and 15b are connected so as to provide a potential difference. In addition,
As in the case of the electromagnetic detection of the first embodiment, the frequency of the signal supplied from the signal generator 14 avoids the frequency of the noise signal and practically uses a frequency of about 10 KHz or 1 KHz.

In the case of the electrostatic sensor 11, the induced voltage from the conductor 13 to which the high-frequency signal is applied is not directly detected, but is recognized as an electrostatic capacitance and a high-sensitivity measurement described later is performed. The target conductor 13 and the sensor head 11a are incorporated in a possible bridge circuit (reference numeral 26 in FIG. 19) by a change in an output voltage from the bridge circuit 26.
, That is, a change due to the twist pitch Ps, and the same signal processing as described in the electromagnetic method is used to determine the twist pitch Ps.

Here, the relationship between the capacitance C between the sensor head 11a and the target conductor 13 and the distance g between them is as follows.
Since there is a relationship of C∝1 / Log (g), the capacitance C decreases as the distance between the two increases. 14 and 15 illustrate only the relationship with the detection electrode (P). However, since the partial capacitance exists between all of the electrodes, conductors, and ground, the present embodiment In the case of the morphological measurement method, as shown in FIG. 16, it is necessary to consider the influence on at least six partial capacitances. In this case, the following configuration is adopted.

First, it is preferable that the width and length of the sensor head 11a be small in order to increase the detection resolution.
The value of the capacitance decreases, and the detection sensitivity decreases. Further, when the sensor head 11a is exposed, fluctuations of other conductors 13 and objects present in the surroundings are caused by the sensor head 11a.
A variation is caused in the capacitance measurement value due to a, causing an error.
For this reason, as shown in FIG. 17, a shield cover 24 (E) as a metal ground layer that functions as a protective electrode is provided between the sensor head 11a and the periphery thereof.
As a result, as shown in FIG. 18, each of the sensor head 11a (P), the shield cover 24 (E), and the measurement conductor 13 (T) and the other conductor (O) existing on the outer circumference in the cable core 5 to be measured. Capacitance CPE, CEO, CPT, C
PO, CTE and CTO will occur. In this state, when the position of the measurement conductor 13 (T) is changed in the cable core 5 as shown by the arrow in FIG. 17, the capacitances CPE, CEO, CPT, CPO, CTE, The CTO changes, but among them, the capacitance CPT changes greatly, and the others do not change much.

As for the capacitances CTO and CTE, when they are twisted and integrated, the distance between the conductors becomes shorter, and the capacitance gradually increases. In addition, as the amount of the cable core 5 wound up by the cable core winding device 18 becomes longer due to the progress of the twisting and the length of the cable core 5 wound up by the cable core winding device 18, the target conductor 13 (T) and the other Conductor (○)
The capacitance CTO gradually increases. That is, the capacitance CPT between the sensor head 11a of the electrostatic detection type and the target conductor 13 is the capacitance CPT that increases gradually.
It will be superimposed on TE and CTO. Since there is a substantially constant amount of change over the entire length depending on the arrangement position of the target conductor 13, the rate of change of the capacitance CPT changes in a direction decreasing with the progress of twisting. As a result, the signal generator 1
4 increases, the amount of change in the output voltage from the detection circuit 26 decreases, and the measurement sensitivity decreases.

Therefore, in order to cancel the changes in the capacitances CTE and CTO and to increase the sensitivity of the capacitance type detection, this embodiment uses a capacitance measurement bridge circuit 26 as shown in FIG. ing. In this case, as shown in FIGS. 17 and 18, the sensor head 11a (positive electrode) (P),
A shield cover 24 (E) grounded as a protective electrode,
All electrodes of the target conductor 13 (T) and other conductors (O)
Partial capacitance between conductors CPE, CPT, CPO, CET, CT
Since there are E and CTO, these are connected to the terminals A, B and D of the predetermined bridge circuit 26 and inserted into appropriate sides of the bridge, so that there is no error in the measurement of the capacitance CPT to be measured at the time of measurement. It is configured as follows.

In this case, as shown in FIG.
The variable capacitance 26 is set such that the equilibrium condition is established when the capacitance CPT between the sensor head 11a (positive electrode) and the sensor head 11a is minimum.
a By adjusting the variable resistor 26c, the output of the bridge detector 26b between the points C and D is set to a zero balanced state so as to become zero, and thereafter, the change in the detected value with respect to the zero balanced state at the detector 26b is determined. It is configured to look. According to such a configuration, the variable capacitance 26a is adjusted so that the width of the change of the output signal is maximized, so that the detection sensitivity can be maximized.

In this case, the partial capacitances CTE, CTO, CPO, CPE, and CEO that do not need to be measured other than CPT are set to the four terminals A, B, and B of the bridge circuit so as not to affect the balance condition.
It is necessary to connect to points C and D. Therefore, the bridge circuit has two sides as resistors. That is, the variable high resistance element 26d is inserted between B and C, and the high resistance element 26d is inserted between B and D. A capacitor 26e is inserted on the side of the line A-D to which the capacitance CPT is connected. Also, the shield cover 24
(E) and the other conductor (O) are both grounded.
The capacitance CEO in FIG. 6 and FIG. 18 disappears and becomes zero. The positive electrode P (11a) is connected to the point D, the conductor T (13) is connected to the point A, the shield cover 24 (E) and the other conductor (O) are collectively connected to the point B and grounded. The CPT is inserted between the ADs of the bridge in parallel at positions that affect the balance of the bridge. CPO and CPE are in parallel with the high resistance between BD and do not affect the equilibrium condition, and CTO and CTE are between the diagonals A and B of the bridge, which are also irrelevant to the equilibrium condition. As a result, the sensitivity of the bridge detection circuit is reduced. It will not be reduced.

However, in the actual wiring, it is necessary to connect the signal generator 14 and the point A of the bridge circuit. Therefore, as shown in FIGS. 13, 14 and 15, the wires 15a and A of the wiring connected to the conductor 13 are connected. Wiring (XX) connecting the points is provided.

With this configuration, an output voltage mainly corresponding to a change in the capacitance CPT between the sensor head 11a (P) and the target conductor 13 (T) appears between the terminals C and D. It can be used as the output voltage of the sensor 11 of FIG. As a result, the variation in the error of the bridge to the equilibrium condition is suppressed to a minimum, and therefore, the bridge circuit 26 having high measurement accuracy can be configured.

The other configurations, that is, the configurations of the cable length measuring instrument 12 and the arithmetic circuit 29 (FIG. 8) are the same as those of the first embodiment, and the description is omitted.

Also in this embodiment, as in the first embodiment, during the twisting step of the CCP cable 10, the C
While moving the CP cable 10, a high-frequency signal is given only to a specific conductor 13 in the CCP cable 10, and the electrostatic influence exerted on the surroundings by the high-frequency signal is detected by the sensor 1.
1 can be obtained. At this time, the sensor 11
FIG. 12B shows a signal obtained by the above operation. After that, the pulse signal is compared with a predetermined threshold value (X) as shown in FIG. 12B by the pulsating circuit unit 31 to form a pulse as shown in FIG. 12C, and the first delay circuit unit 32 and the second After being delayed by the delay circuit unit 33 as shown in FIG. 12D, by comparing with two predetermined threshold values (Es, Er),
Pulse signals as shown in FIGS. 12E and 12F are separated and extracted. And, using these as gate signals,
The first counting unit 34 and the second counting unit 35 respectively count the number of pulses of the measuring signal (FIG. 12 (g)) entering between the gate pulses by a counter, and use the unit length of the measuring pulse interval. After being converted into the length, it is output to the first display unit 36 and the second display unit 37 for display.

Of course, the effect achieved by this operation is the same as in the first embodiment.

<< Modifications >> (1) In the first embodiment, the cable length measuring instrument 12
As described above, the measuring wheel 28 is configured to rotate so as not to come into contact with the SZ-twisted cable core 5 so as to slip, but to move the cable core in a non-contact manner using an optical displacement measuring device (laser Doppler detection) or the like. A device for measuring the distance may be used.

(2) In the above embodiment, the CCP cable with periodic reversal has been described. However, the present measuring device may be applied to continuous measurement of the twist pitch of a general twisting machine or a collective machine.

[0058]

According to the first to third aspects of the present invention,
An electrical detection sensor that provides a signal only to a specific target insulated wire to be measured among the multiple insulated wires of the stranded cable, moves the stranded cable in the axial direction, and approaches the outer surface of the stranded cable. By detecting the change in the electrical effect of the signal of the target insulated wire on the surroundings, the change in the separation distance between the electrical detection sensor and the target insulated wire twisted in the twisted cable is detected and detected. The twisting cycle of the target insulated wire is calculated and detected based on the change in the separation distance and the length of movement of the twisted cable in the axial direction, so the total length of the twisted cable to be shipped to the market as a product is Inspection can be performed simultaneously during the twisting operation. That is, since it is not necessary to perform sampling as in the conventional case, it is not necessary to manufacture a cable length including the extra sample length, and it is possible to reduce the loss cost for the extra sample size and to reduce the man-hour and time required for the sample inspection. Can be omitted.

In addition, when the twisted cable is moved in the axial direction at the time of the twisting operation, the inspection can be performed at the same time, so that many defective products are generated as compared with the conventional inspection after completion. Can be prevented in advance, and the twisting work environment can be improved.

Further, the twisting period can be easily detected quantitatively with high accuracy over the entire length of the cable without taking out a sample and performing an inspection having a relatively large measurement error.

According to the fourth and fifth aspects of the present invention, particularly when the insulated wire is repeatedly inverted and twisted at a predetermined cycle in the stranded cable, Not only the pitch but also the twist reversal period length can be easily detected.

Further, according to the invention described in claim 6,
When the twisted cable is moved while being wound by a winding drum of a predetermined winding device, a first rotating with the winding drum is performed.
The signal from the signal generator can be easily applied to the moving insulated wire only by making the conductive member slidable with respect to the second conductive member.

According to the invention, when the twisted cable is moved while being wound by the winding drum of the predetermined winding device, the transformer 2 rotates together with the winding drum.
There is an advantage that the signal from the signal generator can be easily applied to the moving object insulated wire through a small power transmission unit by the transformer primary coil provided rotatably concentrically with the secondary coil.

[Brief description of the drawings]

FIG. 1 is a side view showing slackening of an insulated wire inside when a sheath of a CCP cable according to a first embodiment of the present invention is partially removed.

FIG. 2 is a schematic view showing the principle of an SZ set pitch continuous measuring device according to the present invention.

FIG. 3 is a schematic diagram showing a signal current supply mechanism according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a CCP cable, a cable core winding device, and a signal generator according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an equivalent circuit of a CCP cable, a signal generator, and a sensor according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a state of generation of a magnetic field when a target insulated wire pair in the CCP cable according to the first embodiment of the present invention approaches a sensor.

FIG. 7 is a diagram illustrating a state of generation of a magnetic field when the target insulated wire pair in the CCP cable according to the first embodiment of the present invention is separated from the sensor.

FIG. 8 is a block diagram showing an arithmetic circuit and a display unit according to the first embodiment of the present invention.

FIG. 9 is a waveform diagram showing an applied signal applied to a conductor from the signal generator according to the first embodiment of the present invention.

FIG. 10 is a waveform chart showing signal voltages received by the sensor head according to the first embodiment of the present invention.

FIG. 11 is a diagram showing a signal waveform when detecting a signal voltage from the sensor according to the first embodiment of the present invention.

FIG. 12 is a diagram showing input waveforms of various parts in the arithmetic circuit according to the first embodiment of the present invention.

FIG. 13 is a CCP cable according to a second embodiment of the present invention;
It is a figure showing a cable core winding device and a signal generator.

FIG. 14 is a diagram illustrating a state of capacitance when a target insulated wire in a CCP cable according to a second embodiment of the present invention is separated from a sensor.

FIG. 15 is a diagram illustrating a state of capacitance when a target insulated wire in a CCP cable according to a second embodiment of the present invention approaches a sensor.

FIG. 16 is a diagram illustrating a state of a partial capacitance between each electrode of a sensor unit, a target insulated wire, and other insulated wires in a CCP cable according to a second embodiment of the present invention.

FIG. 17 is a schematic view illustrating a structure of a sensor according to a second embodiment of the present invention.

FIG. 18 is a diagram showing an equivalent circuit of a partial capacitance between each electrode and an insulated wire conductor of the sensor according to the second embodiment of the present invention.

FIG. 19 is a diagram illustrating a bridge detection circuit according to a second embodiment of the present invention.

FIG. 20 is a partially cutaway perspective view showing a CCP cable.

FIG. 21 is a sectional view showing a CCP cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated strand 2 Quad 3 Subunit 4 Upper winding tape 5 Cable core 6 Aluminum tape 7 Sheath 10 CCP cable 11 Sensor 11a Sensor head 12 Cable length measuring instrument 13 Conductor 14 Signal generator 16a, 16b Brush 18 Cable core winding device 19 Drum 24 Shield cover 26 Bridge circuit 28 Measurement wheel 29 Arithmetic circuit 31 Pulsing circuit unit 32 First delay circuit unit 33 Second delay circuit unit 34 First counting unit 35 Second counting unit 36 First display Part 37 Second display part

Claims (7)

[Claims] 1. A twisting cycle detecting method for detecting a twisting cycle of an insulated wire of a twisted cable formed by twisting a plurality of insulated wires, wherein the twisted twisted cable is moved in an axial direction. At the time, a signal is given only to a specific target insulated wire to be measured among a plurality of insulated wires of the stranded cable, and the target insulated wire is detected by an electrical detection sensor close to an outer surface of the stranded cable. By detecting a change in the electrical influence of the signal on the surroundings, a change in the separation distance between the electrical detection sensor and the target insulated wire twisted in the twisted cable is detected, and the detected change is detected. A method for detecting a twist period of a twisted cable, wherein the twist period of the target insulated wire is calculated and detected based on a change in a separation distance and a moving length of the twisted cable in an axial direction. 2. The twisting period detecting method according to claim 1, wherein at least one pair of the insulated wires of the twisted cable is the target insulated wire, and a signal is generated at one end of the pair of the target insulated wires. Forming an electric loop circuit by twisted insulated wires by connecting the other end to each other, using an electromagnetic sensor as the electric detection sensor, and sending a signal from the signal generator to the electric loop circuit. The electromagnetic sensor detects a change in the magnetic field caused by the following, while detecting the axial movement length of the stranded cable with a predetermined measuring instrument, the separation distance obtained from the output signal of the electromagnetic sensor Detecting the twist pitch in the twisted cable of the target insulated wire based on the change in the length and the moving length obtained from the measuring instrument. Way out. 3. The twisting period detecting method according to claim 1, wherein an electrostatic sensor is used as the electric detection sensor, and the signal is given by the electrostatic sensor. Detecting a change in capacitance occurring between the target insulated wire and the other end, detecting a moving length of the stranded cable in the axial direction with a predetermined measuring instrument, and obtaining the output signal of the electrostatic sensor. A method for detecting a twist period of a twisted cable, comprising: detecting a twist pitch in the twisted cable of the target insulated wire based on a change in the separation distance and a movement length obtained from the measuring instrument. 4. The method of claim 1, wherein the insulated wire is repeatedly inverted at a predetermined cycle in the stranded cable and twisted. A twisting cycle detection method for detecting a twist pitch and a twist reversal cycle length, wherein a pulse signal is formed based on an output signal from the electrical detection sensor, and a first pulse of a first cycle is formed from the pulse signal. A signal and a second pulse signal of a second cycle longer than the first cycle are separated and taken out from each other,
The cycle of the twist is determined as the twist pitch, the second cycle is defined as the twist inversion cycle length, and the twist pitch and the twist inversion cycle length are distinguished from each other and detected. Method. 5. The twisting period detecting method according to claim 4, wherein after forming a pulse signal based on an output signal from the electrical detection sensor, the pulse signal is converted into a delayed waveform signal by a delay circuit. And extracting the first pulse signal of the first cycle by comparing the delayed waveform signal converted by the delay circuit with a first threshold value. Wherein the second pulse signal of the second period is extracted by comparing the delayed waveform signal with a second threshold value different from a first threshold value. Synchronous period detection method. 6. The twisting cycle detecting method according to claim 1, wherein when the twisted twisted cable is moved in the axial direction, the twisting is performed by a winding drum of a predetermined winding device. The cable is moved while being wound up. At this time, the target insulated wire is connected to a first conductive member that rotates together with the winding drum, and a second signal generator is connected to a signal generator that supplies a signal to the target insulated wire. A conductive member disposed slidably with respect to the first conductive member, and a signal from the signal generator is passed through the second conductive member and the rotating first conductive member to the target insulated wire. And a method for detecting a twisting cycle of a twisted cable. 7. The twisting period detecting method according to claim 1, wherein the object that rotates together with a winding drum of a predetermined winding device when the twisted cable is moved in an axial direction. A signal from the signal generator is supplied to the target insulated wire through a transformer secondary coil connected to the insulated wire pair and a transformer primary coil provided concentrically and rotatably. A method for detecting the twisting cycle of a twisted cable.