JPH0150046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a random number pitch stranded wire and a method for manufacturing the same, and more specifically, the twist pitch of the stranded wire is randomly selected for each appropriate length section of the stranded wire, and a desired one is obtained. The present invention relates to a twisted wire that changes one after another by taking random numbers within a numerical range, and a method for manufacturing the same.

BACKGROUND ART Conventionally, in a communication cable, a technique is widely known in which the twist pitches of a plurality of twisted pairs or cut-stranded wires to be assembled are made to differ from each other, thereby improving the crosstalk characteristics of the communication cable. This is a measure to reduce static coupling and electromagnetic coupling between each stranded wire, but if there are many stranded wires included in one aggregate cable, the twist pitches of all stranded wires may be It is difficult to manufacture different wire bobbins with different twist pitches, and the management of selecting and combining stranded wire bobbins with different twist pitches and installing them in the sending section of the collecting machine is complicated. The current situation is that there is no such thing.

In addition, various electronic devices have recently been widely used in offices, laboratories, factories, etc., with so-called office automation becoming popular.
Power cables, control cables, communication cables, etc. of electronic devices are often complicated and close together, and there is a risk that each electronic device may be confused or malfunction due to electromagnetic induction between these cables. Furthermore, with the recent rapid advancement of computerization, there is a tendency for similar accidents to occur inside the engine compartment of automobiles.

The present invention was made in view of these current circumstances, and provides a new random number pitch twisted wire and a method for manufacturing the same, which can be applied to all communication cables, control cables, and input/output power cables.

FIG. 1 explains the random number pitch stranded wire S of the present invention, and for simplicity, a twisted pair wire made by twisting two strands w is shown, but of course this is limited to a twisted pair wire. The same applies to twisted wires or twisted wires containing any number of strands. In FIG. 1a, a section of length L ₁ of the stranded wire has a twist pitch p ₁ , a next section of length L ₂ has a twist pitch p ₂ , then a twist pitch p ₃ , The twist pitch changes one after another for each appropriate length section of the twisted wire, and the value to be taken as the twist pitch is set as a random number such as pi = 50, 73, 91, 61, 86, etc. be. As for the numerical range of this random number, for example, 30 mm≦pi≦150 mm is preferably used in the case of twisted wires for ordinary communication cables, but of course, this numerical range changes depending on the use of the twisted wire. Further, FIG. 1B shows a case where the lengths L of successive sections of the same twist pitch are the same, and this is easier in actual manufacturing.

Next, we will explain the manufacturing method of such random number pitch stranded wire.
The method will now be described with reference to FIG. 2, which shows an example of a device for carrying out this method, and FIG. 3, which also shows a circuit diagram.

In Figure 2, which shows the most basic shape of a wire twisting machine, the first pulse generator is installed in the fryer 2 of the wire twisting machine.
PG ₁ will be established. This is a device that generates one or more pulses per rotation of the fryer 2 by attaching one or more magnets, photoelectric elements, etc., near the outer periphery of the rotating part of the fryer 2, or dividing the circumference evenly. .

Next, a measuring wheel 4 with a known circumference l is provided in the middle of the product stranded wire S being wound by the winding device 5 and traveling, and a second pulse generator PG ₂ similar to that described above is connected to the measuring wheel 4. establish.

FIG. 3 shows a block diagram of the control system used in the present invention. First, the first counting circuit C ₁ counts the number of pulses generated by the first pulse generator PG ₁ ;
Further, a second counting circuit _C2 is provided to count the number of pulses generated by the second pulse generator _PG2 . If one pulse is emitted each for one revolution of the fryer 2 and the measuring wheel 4, then _{n 1} pulses are emitted for each n revolution of the flyer 2 within a certain period of time.
are counted in the counting circuit C ₁ and during the same time period n ₂ pulses per n ₂ revolutions of the measuring wheel 4 will be counted in the second counting circuit C ₂ . Therefore, in this case, the rotation speed of fryer 2 is
n ₁ , the traveling speed of the product stranded wire S is n ₂ l, and the twist pitch p is calculated as p=n ₂ l/n ₁ . However, the circuit that actually performs this calculation is the arithmetic circuit A. A comparison circuit CP is also provided,
The pitch value p is input from the arithmetic circuit A to the comparison circuit CP, and a random number pitch pi within a desired numerical range to be compared with this is input from a separately provided random number generator or random number tape reader. In this comparator circuit CP, the pitch value p of the twisted wire S, which is currently being twisted, is compared with a set random number pitch value pi. Of course, when p=pi, the current operating state is sufficient, so there is no output from the comparator circuit. p＞
When pi, a negative pulse is output from the comparison circuit CP and enters the motor control circuit, which decelerates the motor M that drives the winding device 5. When p<pi, a positive pulse is output from the comparator circuit CP, enters the motor control circuit, and speeds up the motor M. In this way, the twist pitch p of the currently ongoing twisting process is constantly compared with the set random number pitch pi, and the winding speed of the twisted wire is adjusted so as to be equal to this pitch value pi.

Now, during the length section of the twisted wire string, that is, for example, the length L shown in Fig. 1b, one random value,
For example, suppose you adjust the twist pitch to p ₁ . The point at which this length section L ends can be detected as the number of pulses by the second pulse generator _PG2 provided in the measuring wheel 4, so at this point a signal is sent to the random number generator or tape router TR. The next random value, ie, _p2 , is input to the comparator circuit CP.
A practical and easy method is to use porcelain tape 7 (fourth
For example, 200 to 300 random numbers within a desired numerical range are entered in the binary representation format shown in the figure).
The magnetic tape 7 may be read by the tape reader TR by circularly rotating the magnetic tape 7, and the read random number may be inputted to the comparator circuit CP as the set random number at that time. In this way, the twist pitch will be a random value for each section of length L of the twisted wire.
Random number pitch twisted wires that sequentially change as p ₁ , p ₂ , p ₃ , etc. can be easily obtained. It should be noted that the numerical values on the tape 8 on the left side of FIG. 4 are the binary representation of the magnetic tape 7 on the right side converted into decimal representation.
Furthermore, the Japanese Industrial Standard (JIS) is used as a random number generator.
Based on the principle of creating random numbers, mathematical operations such as the multiplication method or the median square method are performed, and the digit of the resulting number is used.

In this embodiment, the number of rotations of the flyer 2 is counted as a digital quantity by the first pulse generator _PG1 , and the traveling speed of the stranded wire S is also counted by the second pulse generator PG1.
The number of rotations of the measuring wheel 4 per unit time is counted as a digital quantity by the PG ₂ , and control is performed by calculating and comparing these digital quantities. However, it is also possible to adopt a modified embodiment in which the rotational speed of the fryer 2 is detected using an analog value such as voltage using a tacho generator, and the winding speed is controlled by comparing the analog value and using a control circuit. .

The length L of consecutive sections of the same twisted pitch depends on the type of twisted wire and the purpose of use, but for short wires such as those for automobiles and control purposes, L = 2 ~
3m, and L = 10 to 20m is suitable for communication cables.

The random number pitch stranded wire of this invention is one type of stranded wire as a whole even though the twist pitch varies randomly in the longitudinal direction. When manufacturing a wire collecting machine, there is no need to take any consideration and it is sufficient to install a bobbin of one type of random number pitch-stranded wire. For example, when assembling 5-cut communication cables, the probability that parts with the same twist pitch of the 5 cut-stranded wires exist in parallel is fairly low, and in fact, it is important to pay attention to the twist pitch of the 5 cut-stranded wires. This has the effect of producing the same result as when five-cut cables are assembled with different points, but with extremely low management effort and cost.

In addition, it is possible to effectively eliminate or reduce the inconvenience caused by electromagnetic induction between many wires that are complicated and close to each other in control cables, power cables, etc. for electronic devices.
This is a truly groundbreaking electric wire for the 21st century.

[Brief explanation of drawings]

FIGS. 1a and 1b are simplified side views showing an embodiment of the present invention; FIG. 2 is a simplified side view showing an example of a basic twisted wire device for carrying out the method of the present invention;
Figure 3 is a circuit diagram explaining the method of this invention;
The figure is a simplified plan view showing an example of a magnetic tape showing random numbers. 2... Flyer, 4... Measuring wheel, PG ₁ ...
...Second pulse generator, PG ₂ ...Second pulse generator,
C ₁ , C ₂ ... Counting circuit, A ... Arithmetic circuit, CP ...
Comparison circuit, TR...tape reader or random number generator.

Claims (1)

[Claims] 1. In a twisted wire formed by twisting a plurality of strands (w), the twist pitch value is sequentially set at random values (pi) within a desired numerical range for each appropriate length section. A random number pitch twisted wire that is characterized by the fact that it changes over time. 2. (a) Step of detecting the number of revolutions (n ₁ ) of the stranding machine flyer 2 within a certain period of time, and (b) Detecting the running length (n ₂ l) of the product stranded wire within the said period of time. (c) Inputting the running length (n ₂ l) of the twisted wire and the rotation speed (n ₁ ) detected from each of the above steps into an arithmetic circuit to calculate the current twist pitch value (p = n ₂ l/n ₁ ), (d) step of successively setting random numbers within a desired numerical range for each appropriate length section of the stranded wire, and (e) calculation in the previous step. Twisted pitch value (p)
and a step of inputting and comparing said set random value (pi) into a comparison circuit; , and a step of controlling the rotation speed to be lowered when p<pi.