JPH0769134B2 - Insulated metal wire group spacing measurement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for measuring a metal wire interval of a metal wire group in which insulated conductors are juxtaposed in a flat band like a core wire conductor of a flat cable. .

[Prior Art] Demand for flat cables in which a large number of insulated core conductors are arranged in parallel and formed into a flat band has been increasing with the spread of OA equipment, but when connecting the cable terminals, the flat cables are closely arranged. Since it is laborious and not easy to connect the ends of many thin core conductors to the connector, it is desired to automate the connecting work. In order to automate the connector connection work for such a large number of flat cables, it is necessary that the spacing between the core conductors be a specified value, so the spacing between the core conductors must be measured accurately. I have to
Conventionally, the distance between the core conductors has been visually measured.

Unlike flat cables, many thin metal wires are insulated and are not parallel to each other in a flat strip, but cores of spiral reinforcements connected in a spiral direction in the circumferential direction to the main reinforcements of linear reinforcement inside a concrete cylinder. In order to detect the arrangement interval of the material, the side length of the detection coil is formed to be the same as the pitch of the spiral streak so that the mutual inductance between the coil and the spiral streak is large, and this coil is attached to the side of the concrete cylinder. In addition, there is known a method for detecting the arrangement interval of Japanese Patent Laid-Open No. 52-4262, in which the pitch of the spiral muscle is detected by the change of the magnetic flux of the coil.

In order to detect the rotation speed of the gear, the yoke of the coil that detects the pitch of the gear is formed in a tapered shape so that the magnetic flux density is not saturated, and the diameter of the end face of the small diameter part of this tapered yoke is set to the gear tooth. Electromagnetic induction of No. Sho 58-80518, in which the tip of a detection coil, which is formed with the same pitch as the pitch and has a coil wound around its outer circumference, faces the rotating gear and detects the number of rotations of the gear by changing the magnetic flux. Type detectors are known.

Also, in order to reduce the leakage magnetic flux of the coil that detects the number of rotations of the gear by changing the magnetic flux with the tip facing the rotating gear, a permanent magnet is sandwiched between the magnetic yokes.
A gear sensor of -149822 is known.

[Problems to be Solved by the Invention] As described above, by visually measuring the interval between a large number of thin core conductors closely arranged in a flat cable,
Not only is the efficiency low, but it is difficult to obtain accurate measurement results because high precision is required as the equipment becomes more precise, and it is not easy to automate the connector connection work.

Further, the method for detecting the arrangement interval of the spiral reinforcements of the concrete cylinder disclosed in the above-mentioned patent application requires that the side length of the coil be formed to be the same as the pitch of the spiral reinforcements, so that the coil size changes every time the spacing of the spiral reinforcements changes. Has to be changed, and when measuring, it is necessary to target every two spiral muscles. This is a flat line where a number of thin metal wires are insulated and parallel to each other in a flat strip. It cannot be applied to the distance measurement of a core conductor group such as a cable.

Further, the electromagnetic induction type detector and gear sensor for detecting the number of rotations of the gear of the above-mentioned utility model application also measure the core conductor spacing in which a large number of thin core conductor groups are densely arranged in a flat band like a flat cable. Can not be used for.

The present invention provides an insulated metal wire group spacing measuring method capable of accurately and efficiently measuring the spacing between conductor metal wires in which thin insulated core wire conductor groups, such as the core wire conductors of a flat cable, are densely arranged in a flat band. The purpose is to do.

[Means for Solving the Problems] In order to solve the above problems, the insulated metal wire group interval measuring method according to the present invention is high-frequency excited by a magnetic head having two sharply facing sharp tips 3 and 4. A coil 6 is provided to form a high-frequency magnetic field having a non-uniform magnetic flux density distribution in the gap between the opposed acute-angled tips 3 and 4, and insulates the two opposed acute-angled tips 3 and 4 into a flat strip shape. The metal wire groups are arranged on both sides of the magnetic wire group, and the flat strip-shaped parallel insulating metal wire groups are placed between the acute-angled sharp tips 3 and 4 of the magnetic head so that the magnetic flux crosses the insulating metal wire groups. The flat strip-shaped parallel insulated metal wire is moved by relatively moving the head and the flat strip parallel insulated metal wire group, and the interval time of each pulse signal detected by the pulse signal detection coil 7 provided in the magnetic head is measured. Measure the spacing between each metal wire in the group It is a method characterized by that.

[Operation] The high-frequency exciting coil forms a high-frequency magnetic field in the gap of the magnetic head, and the two acute-angled tips 3 and 4 facing each other are
The magnetic flux density distribution in the gap is made non-uniform to generate a concentrated magnetic flux at the sharp tip, and the central metal wire located directly under the opposite sharp tip 3, 4 of the metal wire group placed in the gap. Maximize the density of the magnetic flux across.

The two acute-angled tips 3 and 4 of the magnetic head are arranged so as to face each other so as to sandwich the flat-belt-shaped parallel insulated metal wire group and form the magnetic flux distribution as described above. When a flat strip-shaped parallel insulated metal wire group is placed in the gap between the four and the flat strip-shaped parallel insulated metal wire group is relatively moved in the direction in which the magnetic flux crosses the insulated metal wire group, directly below the points of the acute-angled tips 3, 4 facing each other. Each time each metal wire crosses, the concentrated magnetic fluxes of the acute-angled tips 3 and 4 that face each other intersect with the metal wire to generate a pulse signal, and each pulse signal is detected by the pulse signal detection coil. The interval time of each pulse signal detected for each metal wire is measured, and the interval between the metal wires is calculated by this interval time measurement value and the relative moving speed.

As described above, by moving the flat strip-shaped parallel insulated metal wire group between the two sharp-angled tips 3 and 4 of the magnetic head which face each other, between the thin core conductors closely arranged like a flat cable. Accurate and efficient measurement is possible even at intervals.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of measuring the distance between metal wires which are core conductors of a flat cable by the method of the present invention.

In FIG. 1, reference numeral 1 is a magnetic head made of ferrite, and the head of the gap 2 facing the head is formed at an acute pointed tip 3, 4 having a conical shape. Two sharp-angled tips 3 and 4 of this magnetic head are made to face each other, and they are arranged on both sides of a group of insulating metal wires parallel to each other in a flat band shape.

Reference numeral 5 denotes a yoke portion, on which a high frequency exciting coil 6 and a pulse signal detecting coil 7 are wound. 8
Is a high frequency oscillating circuit connected to the high frequency exciting coil 6, and 9 is a detection signal processing circuit connected to the pulse signal detecting coil 7.

A high-frequency exciting current of, for example, 50 is applied to the high-frequency exciting coil 6.
When an exciting current of 0 KHz is passed, a high-frequency magnetic field is formed in the gap 2 between the acute-angled tips 3 and 4 of the magnetic head 1.
A large amount of leakage magnetic flux is concentrated at the sharp tips 3 and 4, and a very uneven magnetic flux density distribution is generated in the gap 2.

This is because the magnetic flux in the non-magnetic material is almost perpendicular to the crossing interface between the ferromagnetic material such as ferrite and the non-magnetic material, and as shown in FIG.
Let θ1 and θ2 be the angles at which the magnetic flux Φ passes at the interface A-A between the non-magnetic substance of 1 and the ferromagnetic substance of μ2 (μ1 << μ2).
tan θ1 / tan θ2 = μ1 / μ2 and μ2 = 6000μ1 and θ2 = 89 °, θ1 = 0.54 °. As described above, a large amount of leakage magnetic flux is concentrated on the sharp-angled tips 3 and 4 in the gap 2, and the distribution of the magnetic flux density becomes extremely uneven. Third
The figure shows the distribution of the magnetic flux density at the acute-angled tips 3 and 4 of such a magnetic head.

As described above, the flat cable B is placed in the gap 2 between the two opposed acute-angled tips 3 and 4 in which the high-frequency magnetic field is formed, and the magnetic head 1 or the flat cable B is relatively arranged in the direction perpendicular to the core conductor C. When you move it to this gap 2
Since the core wire conductor C of the conductive metal wire crosses the magnetic flux of
An electromotive force of dΦ / dt is generated, and this electromotive force is proportional to the changing speed of the magnetic flux, and when the frequency is constant, the larger the magnetic flux density is, the larger the electromotive force is generated. As a result, the detection signal of the pulse signal detection coil 7 is output to the detection signal processing circuit 9.

Thus, the magnetic flux interlinking with each core conductor C of the flat cable B placed in the high frequency magnetic field in the gap 2 is
As shown in the third drawing, the density of the magnetic flux across the central core conductor C ₀ located immediately below the facing acute-angled tips 3 and 4 of each core conductor C is the highest.

Therefore, when the magnetic head 1 is moved in the direction indicated by the arrow in FIG. 1 at a moving speed V and the magnetic fluxes of the two acute-angled tips 3 and 4 cross the flat cable B at the speed V, the pulse signal detecting coil 7 The detection signal is amplified and detected in the detection signal processing circuit 9, and signal waveforms p01, p02, p0 as shown in the fourth diagram are obtained.
3 will be obtained. This signal is converted into pulse signals p1, p2, p3 ... As shown in FIG. 5 by a comparator having an appropriate threshold value (e).

Since the intervals between the pulse signals p1, p2, p3 ... Are proportional to the intervals between the core conductors C of the flat cable B, the core conductors are measured by measuring the interval time between the pulse signals p1, p2, p3. The distance between can be measured.

In order to obtain a more accurate measurement value of this interval time measurement, the time difference between the rising edges of the pulse signals p1, p2, p3 ...
If the time difference t2 between t1 and the falling time is measured, the distance D between the conductor core wires can be calculated from the average value of t1 and t2 and the moving speed V of the magnetic head by the equation D = V. (t1 + t2) / 2. . The measured value of each time difference and the calculated value of the above equation can be quickly obtained by a computer.

As described above, the distance between the conductive metal wires, which are the core conductors of the flat cable, can be accurately and efficiently measured, so that it is possible to automate the connector connection work for many flat cables.

The method of detecting and measuring the position of the metal wire by the magnetic head 1 provided with the two acute-angled tips 3 and 4 facing each other as described above is the same as the measurement of the core conductor of the flat cable described above. It can be used not only for measuring the position of a long metal wire having properties, but also for measuring the position of a metal sphere.

EFFECTS OF THE INVENTION As described above, according to the present invention, the magnetic head is provided with two opposed acute-angled peaks to make the magnetic flux density distribution in the gap non-uniform, and a flat strip shape is formed between the two opposed acute-angled peaks. The insulating metal wire groups parallel to each other are arranged on both sides of the sandwiched metal wire group, and the flat strip-shaped parallel insulating metal wire groups are relatively moved in the direction in which the magnetic flux crosses the insulating metal wire group between the two opposed acute-angled tips 3, 4. Since the interval time of pulse signals generated by interlinking the magnetic flux of this acute angle with the metal wire group is measured to measure the interval between the metal wires, a large number of thin core wires arranged closely like a flat cable are measured. The distance between conductors can be measured accurately and efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory view of one embodiment of the present invention, FIG. 2 and FIG.
The figure is an illustration of magnetic flux distribution, and FIGS. 4 and 5 are illustrations of pulse signals. 1: Magnetic head 2: Gap 3, 4: Sharp tip 6: High frequency exciting coil C: Metal wire

Claims (1)

[Claims] 1. A high-frequency exciting coil is provided in a magnetic head having two sharp-edged tips facing each other to form a high-frequency magnetic field having a non-uniform magnetic flux density distribution in the gap between the sharp-edged tips. The sharp edges facing each other of the head are arranged on both sides of the insulating metal wire group parallel to each other in a flat band shape, and the flat parallel insulating metal wire groups are placed between the facing sharp edge tips of the magnetic head. Magnetic flux relatively moves the magnetic head and the flat strip-shaped parallel insulated metal wire group in the direction in which the magnetic flux crosses the flat strip-shaped parallel insulated metal wire group, and each is detected by a pulse signal detection coil provided in the magnetic head. An insulating metal wire group interval measuring method, characterized in that the interval between each metal wire of the flat strip parallel insulated metal wire group is measured by measuring the interval time of the pulse signal.