JPH03283208A - Insulated core wire twister - Google Patents

Abstract

PURPOSE:To obtain an insulated core wire twister which can detect a very small pinhole securely by a detection part of a very simple constitution by providing a means for moving an electrode consisting of conductive fibers to slide to get in contact with each insulation core wire being drawn and applying a DC high voltage between the electrode and the conductor of the insulation core wire through respective channel. CONSTITUTION:Insulation core wires W supplied from a twister 1 are collected and arranged to pass a detection part 2 of a pinhole checker. A high voltage is applied to the outer circumference of the insulation core wire W by a high voltage electrode 11 of the detection part 2 at the time. The insulation core wire W has an insulation coating B on the outer circumference of a core C. When a pinhole P is generated in the insulation coating B, a gap is produced to the forward end of a carbon fiber brush of the high voltage electrode 11 to generate a spark discharge. When this spark discharge is generated, the high voltage electrode 11 is shortcircuitted with the earth, so the voltage is reduced rapidly. A pulse wave by the voltage reduction is detected by a pulse detecting part 14 of a detection circuit 5', so the existence of the pinhole is checked. When the existence of the pinhole and its position are detected, the insulation core wire is cut and eliminated around the position of the pinhole after completion of a twisting work, thereby only complete products are used.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a pinhole checker that simultaneously checks whether or not there are pinholes in the insulating layer of a plurality of thin insulated core wires using a plurality of channels. This invention relates to an insulated core wire twisting machine equipped with.

[Conventional technology]

A conventional pinhole checker for insulated core wires slides a chain or ball chain onto the insulating layer of a running insulated core wire, applies a DC high voltage between the conductor of the insulated core wire and the chain, and checks this The current capacity of the DC high-voltage power supply is made small, and if there is a pinhole in the insulating layer, a spark will fly between the chain and the conductor, causing a sudden drop in the power supply voltage.Use this to check for pinholes in the insulating layer. It is configured.

[Problem to be solved by the invention]

Here, since these conventional electrodes are composed of chains or ball chains, fine-sized items such as the insulated core wire of communication cables cannot be matched with chains or ball chains, and pinhole checks may be missed. There are problems such as the large size of the detection unit and the large size of the detection unit.

Furthermore, if a chain or a ball chain is used as an electrode, there is also the problem that the insulation layer of the communication cable is thin, and the insulation layer may be scratched.

In particular, it is extremely difficult to incorporate a pinhole checker into the star-twisting or pair-twisting process of communication cables.

This invention was made in view of the various problems with the conventional insulated core wire twisting machines described above, and its purpose is to twist insulated core wires that are thin and have a thin insulation layer, such as the insulated core wires of communication cables. To provide an insulated core wire twisting machine that facilitates pinhole checking, requires a small installation space, and is equipped with a pinhole checker that can record pinhole positions.

[Means to solve the problem]

Therefore, in this invention, as a means for solving the above problems, a first means for twisting a plurality of insulated core wires, and an insulated core wire that is twisted in synchronization with the first means are provided. In the insulated core wire twisting machine, the insulated core wire twisting machine is equipped with a second means for attracting and taking over the insulated core wires while aligning the insulated core wires, and a third means for twisting the insulated core wires in synchronization with the first means. An electrode made of conductive fiber is brought into sliding contact with each insulated core wire taken at the stage where the insulated core wires are aligned and attracted, and a means is attached for applying a high DC voltage between the electrode and the conductor of the insulated core wire through each channel. The structure of the insulated core wire twisting machine was adopted.

[Effect]

Since the present invention is constructed as described above, it includes a first means for twisting the insulated core wire, a second means for attracting and taking over the insulated core wire, and a third means for twisting the insulated core wire. In the normal process of twisting insulated core wires together, the high DC voltage applied to each electrode made of conductive fibers is maintained at a high voltage unless there are pinholes or other flaws in the insulation coating of the insulated core wires. .

However, if there is a slight scratch such as a pinhole, a spark discharge occurs due to the slight gap between the electrode and the insulating coating at that location, and the potential of the electrode drops instantaneously. By detecting this voltage drop as a pulse signal, the presence or absence of a pinhole in the insulated core wire is detected.

In the above-mentioned pinhole check, since extremely fine conductive fibers are used as electrodes, the check can be performed with higher precision than in the past.

〔Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an overall external view of an insulated core wire twisting machine equipped with a pinhole checker according to the present invention.

This insulated core wire twisting machine generally consists of four sets of untwisting machines 1 (
In the illustrated example, only one set is shown and the others are omitted), the detection part 2 of the pinhole checker, the take-up machine 3, and the star twist II
4, and a control panel 5 which includes a detection circuit 5' of the pinhole checker and controls the driving of each of the devices.

Similar to the conventional example, the twisting machine 1 unwinds an insulated core wire W wound around a drum 6 via a large number of pulleys, and rotates the drum 6 around a rotating shaft (not shown) with respect to a base 7. This gives twist to the insulated core wire.

A plurality of insulated core wires W are fed out from the twisting machine 111 and are collected and aligned, and taken out [13
The twisted insulated core wire is then twisted by the star twister 4 which is also driven in synchronization with the twister 1 to form a twisted insulated core wire.

The detecting section 2 and the detecting circuit 5' provided between the untwisting machine 1 and the take-off machine 3 of the above-mentioned insulated wire twisting machine form a pinhole checker. FIG. 2 shows a block diagram of the main parts of this pinhole checker. The detection unit 2 is composed of a plurality of high voltage electrodes 11 (in the illustrated example, four are provided to match the number of star twists). The details are shown in FIG.

As shown in the figure, this high-voltage electrode 11 is formed from an aluminum plate 12 with a large number of carbon fiber brushes 13 embedded therein. In the illustrated example, the carbon fiber brushes 13 are formed by laminating two 1000 r x 3 brushes each having a diameter of 7 fm. Moreover, as shown in FIG. 2, this high voltage electrode 11
Four pairs of pinholes are provided facing each other so that pinholes can be checked all around the insulated core wire W.

A high voltage is applied to each of the high voltage electrodes 11 from the detection circuit 5'. The applied voltage is, for example,
DC power supply (not shown) voltage E = 1.5 from ν to 1.2
A high voltage of kV is applied. However, the applied current is a weak current of a maximum of 2 cods, and is within a safe range even if it comes into contact with the human body.

The detection circuit 5' includes a resistor R, as shown in FIG.

~□ capacitors CI and □ are connected in series, and four sets of pulse detection units 14 are provided in parallel to detect the voltage change (pulse) of the resistor at the negative end.

15 is a touch sensor, and 16 is a detection roller, by which the running of the insulated core wire W is detected. 17 is a capstan of the take-up machine.

In the twisting device of this embodiment constructed as described above, pinholes are checked in the following manner during one twisting process.

The insulated core wires W fed out from the twisting machine 1 are collected and aligned, and then pass through the detection section 2 of the pinhole checker. At this time, a high voltage is applied to the outer periphery of the insulated core wire W by the high voltage electrode 11 of the detection unit 2.

The insulated core wire W has an insulating coating B on the outer periphery of the core C, but this insulating coating B may have invisible pinholes. As shown in FIG. 4, if a pinhole P occurs in the insulation coating B, the high voltage electrode 11
A gap is created between the tip of the carbon fiber brush and a spark discharge occurs.

When this spark discharge occurs, the high-voltage electrode 11 becomes short-circuited to the ground, causing a sudden drop in voltage. The pulse detection section 14 of the detection circuit 5' detects the pulse wave caused by this voltage drop to check whether there is a pinhole. Although not shown in the figure, if a position detector is provided that measures the rotational speed and travel distance in conjunction with the capstan 17 of the collecting machine 3, the pinhole position f when checking the pinholes described above can be determined.
can also be detected.

When the existence and position of a pinhole is detected, the insulated core wire is cut near the pinhole position after the twisting process is completed.
Only removed and intact products will be used.

〔effect〕

As explained in detail above, in the insulated core wire twisting machine according to the present invention, a detection section consisting of a conductive fiber electrode of a pinhole checker is provided between the twisting means and the pulling means, and the detection section detects the pinhole. When a pinhole is detected, the pulse wave is detected by a detection circuit and the presence or absence of a pinhole is detected. Therefore, the extremely simple configuration of the detection unit can reliably detect minute pinholes that cannot be detected by conventional pinhole checkers. This has the advantage of being able to be detected.

[Brief explanation of drawings]

Fig. 1 is a general schematic diagram of an embodiment of an insulated core wire twisting machine according to the present invention, Fig. 2 is a schematic block diagram of a pinhole checker, and Fig. 3 is a detailed diagram of a high-voltage electrode made of a carbon fiber brush. , FIG. 4 is a diagram illustrating the operation of spark discharge by the pinhole checker. 1... Retwisting machine, 2... Detection section,
3...Bow 1 pulling machine, 4...Star twisting machine,
5... Control panel, 5'... Detection circuit, 11... High voltage electrode, 13...
Carbon fiber brush.

Claims (1)

[Claims] (1) A first means of twisting a plurality of insulated core wires;
a second means for arranging and pulling the insulated core wires which have been twisted in synchronization with the first means; and a second means for twisting the insulated core wires in synchronization with the first means. In the insulated core wire twisting machine equipped with the third means, an electrode made of conductive fiber is brought into sliding contact with each insulated core wire taken off at the stage where the insulated core wires are aligned and drawn. An insulated core wire twisting machine characterized by being equipped with means for applying a high DC voltage between conductors through respective channels.