JP2003242845A - Method of manufacturing communication cable with element wires having equal length - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a communication cable with element wires having an equal length. <P>SOLUTION: The method of manufacturing the communication cable with the element wires having an equal length comprises a step of delivering the required number of element wires 11, 12 while giving proper tension thereto to run in a vertical direction, a step of properly arranging the element wires 11, 12 at their running positions in such a manner as to divide the circumference of a diameter into equal parts, a step of properly and disorderly arranging the element wires 11, 12 at their running positions within a circular region of the diameter in a completely irregular fashion, and a step of gathering and stranding the element wires 11, 12 right after the previous step. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a communication cable having an equal length of a wire, and more particularly, to a twisted-wire communication cable having an outer peripheral portion. The present invention relates to a method for manufacturing a communication cable in which the length of a wire located at the center and the length of a wire near the center are equal to each other. 2. Description of the Related Art In a communication cable used for connection between computer devices, in particular, for connection between an imaging device and a display device and between a display device and a printer, it is compared that the length of each element wire is equal. Required with high precision. The reason is to prevent the image transmitted and received between the two devices from being distorted due to the difference in arrival time of the signal. [0003] The work of attaching such terminals to both ends of such communication cables dedicated to connection is the work of related equipment manufacturers, and of course, as a wire manufacturer, long cables that do not have terminals attached to both ends. They are produced and sold in shapes. There has been no invention disclosed as an optimum method for manufacturing such a dedicated cable. [0004] As described above, it is required that the lengths of the individual wires are equal to each other for such a dedicated cable. However, in the case of a conventional general twisted cable, the condition of the lengths of the respective wires is required. Let's consider what is happening in Figure 2. [0005] Suppose that a portion having a length L is cut out between points A and B from a stranded wire 100 having an outer shape d shown in FIG. FIGS. (B) and (c) show the strand 102 located at the center of the stranded wire 100 and the strand 101 located at the periphery. The actual length of the helix line having a diameter d is √ (p ² + π ² d ² ) where p is the pitch, and the number of pitches included in the length L cut out from the cable 100 is Assuming that n, the actual length of the wire 101 at the periphery is n√ (p ²
+ Π ² d ² ). From the comparison between FIGS. 1B and 1C, the difference between the actual length of the wire 102 located at the center and the wire 101 located at the periphery is calculated from the difference of the diameter d in the above equation. The difference is obvious at first glance, and it is clear that conventional ordinary twisted wires cannot be used as such connecting cables. SUMMARY OF THE INVENTION The present invention provides a method for manufacturing such a dedicated cable, that is, a stranded cable in which the lengths of the individual wires are substantially equal. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. According to the first aspect of the present invention, a required number of element wires are appropriately added. Sending them out while applying tension and running them in the vertical direction, arranging the running positions of the respective wires equally around the circumference of an appropriate diameter, and setting the running positions of the respective wires to an appropriate diameter. A method of manufacturing a communication cable having the same length of wires, comprising a step of completely arranging the wires in a circular area and a step of assembling and twisting the wires immediately after the step. FIG. 1 shows an example of an apparatus used to carry out the method of the present invention. The method of the present invention will be described below through the operation of the apparatus. The required number of strands 11, 12,... Are unreeled from the respective delivery bobbins, and are delivered downstream by a take-off device 2, such as a belt-wrap type capstan. Of course, here, each strand 11, 12, ...
Is given an appropriate back tension by the take-up device 2. Each of the strands 11, 12... Is led to a circular arrangement dividing plate 4 via a girder roll 3. As shown in the figure, the circular arrangement dividing plate 4 is a dividing line for arranging the individual wires 11, 12... In a circle around the center line (the center line of the downstream set die 6) in a circumferentially equal manner. It is a plate, and as a simple form, it may be considered that a hole through which a wire runs is formed in the periphery of the disk centered on the above-mentioned center line. Downstream of the circular arrangement distribution plate 4, coaxially therewith, a generally annular element location dislocation arrangement device 5 is provided. This is the most important device of the present invention, and the traveling position of each of the wires 11, 12 and the like is always defined as the central portion at the center portion and the peripheral portion at the peripheral portion as in a conventional ordinary stranded wire. This is a device that avoids a state in which the elementary wire travels in the center, for example, and moves to the periphery at the next moment. The wire location random arrangement device 5 includes a plurality of wire springs 53 extending radially inward from circumferentially equal positions of a ring-shaped main body frame 51 at the ends thereof.
A line guide 52 having perforated holes such as 1 and 12 is attached. The wire spring 53 is a relatively weak spring which can expand and contract in the radial direction, and as shown in FIG. The position changes its position within the circular area inside the body frame 51. That is, as is well known, assuming that the spring constant of the wire spring 53 is k and the amount of extension is x, as shown in FIG.
That is, the position of the line guide 52 changes so that the relationship of nθ = kx holds. The spring constants k of the respective wire springs 53 may be equal to each other or may be slightly different. Each strand 1
Since the tensions of 1, 12,... Always fluctuate, the running position is also within the circular area inside the main body frame 51.
According to the above equation, it changes constantly and irregularly. This is because the device 5 is named a wire location random arrangement device. After passing through the strand location random arrangement device 5, the strands 11, 12,... Are assembled at a collecting die 6 located on the center axis thereof, and are appropriately twisted by a rotary winder 10. Reference numeral 1A indicates a bobbin for winding a product stranded wire, and 1B indicates a traverse device for aligned winding. The rotary winder 1 provided at the last position of the line
0 is disposed horizontally, so that a directional change pulley 8 is disposed between the collecting die 6 and the rotary winder 10, and compensators 7A and 7B for compensating the twisting rotation before and after the directional change pulley 8. Is installed. According to the present invention, since the position of each strand constituting the stranded wire immediately before entering the collective die constantly changes inward and outward, the strand which is always located at the peripheral portion is also changed. Conversely, there is no longer a wire always located at the center, and the running position of each wire is constantly changing. As a result, when the product becomes a stranded wire, the length of each wire is almost equal to each other. There is an advantage that an optimum cable can be manufactured as a communication cable for connection between image-related devices of a computer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a partial perspective view of an apparatus according to an embodiment of the present invention. FIG. 2 is a side view for explaining the actual length difference between an outer strand and an ordinary strand. FIG. 3 is a side view for explaining the operation principle of the strand location random arrangement device. DESCRIPTION OF SYMBOLS 1 Twisted wires 11 and 12 having the same length of strands ... Strand 100 Ordinary strand 101 Strand 102 at the periphery of strand 100 Strand 2 at the center of strand 100 Pulling device 3 Cross-girder roll 4 Circularly-arranged branching plate 5 Elemental wire location irregular arrangement device 51 Main frame 52 Line guide 53 Wire spring 6 Collecting dies 7A, 7B Compensator 8 Collecting dies 10 Rotary winder 1A Winding bobbin 1B Traverse device

Claims (1)

Claims: 1. A step of sending out a required number of strands (11, 12,...) While applying an appropriate tension and running them in a vertical direction; , 12,...) Are arranged equally equally around the circumference, and the running positions of the individual wires (11, 12,...) Are disturbed in a completely irregular circular area. A method for manufacturing a communication cable having the same length of wires, comprising a step of arranging and a step of assembling and twisting the wires (11, 12,...) Immediately after the step.