EP0284204A1 - Manufacture of telecommunications core units - Google Patents

Manufacture of telecommunications core units Download PDF

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Publication number
EP0284204A1
EP0284204A1 EP19880301529 EP88301529A EP0284204A1 EP 0284204 A1 EP0284204 A1 EP 0284204A1 EP 19880301529 EP19880301529 EP 19880301529 EP 88301529 A EP88301529 A EP 88301529A EP 0284204 A1 EP0284204 A1 EP 0284204A1
Authority
EP
European Patent Office
Prior art keywords
guide
conductor
changing means
position changing
movable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19880301529
Other languages
German (de)
English (en)
French (fr)
Inventor
John N. Garner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of EP0284204A1 publication Critical patent/EP0284204A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H01B13/04—Mutually positioning pairs or quads to reduce cross-talk

Definitions

  • This invention relates to the manufacture of telecommunications cable core units.
  • a telecommunications cable is constructed with a core comprising one or more core units, each having a multiplicity of twisted units of conductors, each conductor unit conventionally being a twisted pair of conductors.
  • a core may be formed as a single core unit of twisted conductor units, e.g. 25 or 50 pairs.
  • a larger core i.e. up to 3600 twisted pairs, comprises a plurality of core units. The twisted pairs are stranded together in a stranding machine to form a core unit with the conductors of each pair twisted with a predetermined lead to the twist, i.e. the distance taken along the pair for each conductor to complete a single revolution along its path.
  • twist lay This distance will be referred to in this specification as the "twist lay" of a pair.
  • twist lays provided for the twisted pairs in a core unit with a pair having a particular twist lay being adjacent to other pairs of different twist lays. Care is taken, so far as is practicable, to ensure that pairs of equal or similar twist lays are separated from each other. The reason for this arrangement is to attempt to maximize the communications performance of the cable, e.g. to lessen pair-­to-pair capacitance unbalance, to reduce crosstalk between pairs and to lower the coefficient of deviation of mutual capacitance of pairs in the cable.
  • the conductor pairs enter a guide arrange­ment which comprises a system of horizontal guides movable horizontally and located in vertically tiered fashion.
  • the pairs are distributed throughout the tiers and relative horizontal movement of the guides changes the relative positions of the pairs as they move downstream.
  • the conductor pairs need to be controllably arranged together in their changing relative positions preparatory to their passage into a closing die, in which they are drawn together to form the core unit.
  • Controllable arrangement of the pairs should be possible by passing them from their various positions partly around rollers.
  • extreme height of the Ericsson machine even for changing positions of twenty-five pairs, is such that severe change in angles of feedpaths of some of the conductor pairs is required for them to pass around the rollers. Such a severe change can cause damage to either the conductors or to their insulation, particularly if the insulation is made from pulp, and will also induce large tension variations between conductor pairs.
  • the present invention provides an apparatus for controllably positioning conductor units in a cable core unit thereby minimizing the possibility of two adjacent conductor units lying side-by-side for any substantial distance along the core unit.
  • the apparatus of the present invention may also be used to prevent conductor units from following similar or parallel paths which, even though not closely adjacent, could have some disadvantageous crosstalk or electrical effects.
  • the invention also provides a cable core unit which may be constructed upon the apparatus of the invention and has certain advantageous constructional characteristics.
  • the invention provides according to one aspect, an apparatus for forming a core unit from telecommunications conductor units in which each conductor unit is formed of twisted together insulated conductors, the apparatus comprising a plurality of arcuate position changing means for conductor units, each position changing means for moving an individual conductor unit laterally as it is moved along an individual passline, the position changing means located in spaced side-by-side relationship in series in the general direction of passlines for conductors and so as to extend around a volumetric space; each position changing means comprising a movable conductor unit guide, a guide mounting means providing an arcuate path for movement of the movable guide into four quadrants around the volumetric space, and driving means drivably connected to the movable guide to move the guide alternately in one direction and then in the other around the arcuate path and into all four quadrants around the volumetric space; fixed guide means disposed upstream of the plurality of position changing means, the fixed guide means defining an individual fixed guide surface for each conductor unit and cooperating with
  • each guide mounting means defines an arcuate path lying on the arc of a circle, the arc lying also in a plane transverse to the associated feedpath.
  • the guide mounting means may define arcuate paths other than circular, for instance ellipsoidal paths.
  • guide mounting means and their arcuate paths prefferably have diameters which are substan­tially equal from one position changing means to another.
  • each of the conductor units moves laterally by virtue of movement of the movable guides, around a path which lies on the surface of a cone with each movable guide moving around the periphery of the base of the cone and the fixed guide surface disposed at the cone apex.
  • the conductor units move around paths lying on the surfaces of respective cones which are telescoped within one another and are contained at least partly within the volumetric space but, in any case, do not extend radially outside it.
  • the plurality of position changing means may occupy a small space both axially and radially and in practice the radial direction of the changing means need not be substantially greater than the finished diameter of the core unit.
  • the guide surfaces lie along a line which is inclined relative to the general direction of the feedpaths with the guide surfaces succeeding one another downstream in the same downstream order as their associated movable guides.
  • the invention also provides a core unit for a telecommunications cable comprising a plurality of conductor units each formed from twisted together insulated conductors and in which each conductor unit extends along the core unit while moving angularly around the longitudinal axis of the core unit in reversing manner for an angle of above 270° and approaching 360° and wherein each conductor unit is randomly disposed over any given core unit length in relation to any other conductor unit.
  • a first embodiment as shown in Figure 1 twenty-­five conductor pairs 10, each formed from two twisted together individually insulated conductors, are drawn in conventional fashion, from twenty-five reels 12 of the conductor pairs, for forming into a core unit 14.
  • the core unit 14 is formed at the downstream end of the apparatus by passing the conductor pairs through a closing die 16 which draws the conductor pairs together, and a binding head 18 at which position a binding material is closed around the drawn together conductor pairs to hold them together in convention­al manner. Downstream from the binding head 18 is a conven­tional motor driven core unit take-up reel 26.
  • a device 28 Upstream from the closing die 16 is a device 28 for changing the relative positions of conductor pairs.
  • the device 28 comprises a plurality of position changing means 30.
  • Each position changing means is for moving an individual conductor unit pair 10 laterally as it is moved along an individual passline from a reel 12 to the closing die 16.
  • the position changing means comprise a plurality of elongate rigid members 32, one for each changing means, the members 32 disposed side-by-side in series in the general direction of the passlines of the conductor pairs. As shown in Figures 2, 3, 4 and 5, the members 32 are spaced slightly to provide gaps 34 between them, for reasons to be described, and together surround a volumetric space 36. The gaps 34 in Figure 5 are shown with increased width for reasons of clarity.
  • Each rigid member 32 comprises an arcuate portion 38 which lies on the arc of a circle and a rectilinear portion 40 which extends from one end of the arcuate portion at a tangent to the arc.
  • the other end 42 of the arcuate portion is secured to a part of the member at or adjacent the junction of the arcuate portion with the rectilinear portion, thereby providing a closed loop.
  • the rigid members 32 may be formed from structurally rigid material such as steel or aluminum. In any case, the rigid members must have smooth surfaces in areas which may be contacted by a travelling conductor pair. To provide such a smooth surface and make it hard and wear resistant, each member 32 is formed from steel which is hardened or is ceramic coated or has an anodized polymer impregnated surface.
  • each rigid member is formed with two convex surfaces 44 and 46 which converge at two axially opposite positions. These convex surfaces are provided to assist in the passage of conductor pairs through the gaps 34 and, to this end, the downstream position 48 of convergence of each member is radially outside the upstream position 50 of convergence of the next adjacent downstream member.
  • Each gap 34 is thus inclined generally in a radially outward and axially downstream direction although the arcuate portions 38 of the members 32 lie at substantially equal diameters and are axially aligned.
  • Each rigid member 32 forms a guide mounting means for a movable conductor unit guide 52 which is a short cylinder. As shown in Figures 3, 4 and 5, each movable guide 52 is located radially inwardly of a guide channel 54 formed along the length of the associated rigid member. Driving means is provided for moving the movable guide around the inside of the arcuate portion 38 of each rigid member. For each position changing means, the driving means comprises a flexible member in the form of a cable 56 ( Figure 4) which is slidably received within its guide channel 54. Each metal strip is held in position in its channel by a retaining plate 58 secured to an upstream side of the surface 46.
  • the retaining plate 58 is formed of a suitable material such as spring steel which may easily be flexed into the shape required and secured into position.
  • a radial opening 60 to the channel is provided between an edge of the plate 58 and the opposite edge of the channel. Through this opening extends a rigid neck 62 which secures one end of the cable 56 to the movable guide 52.
  • the other end of cable 56 is joined to a piston rod which extends from an air cylinder 64 (see particulary Figure 5).
  • each position changing means is secured to a frame 66 which extends along side the changing means in a position away from passlines for conductor pairs, the rectilinear portions 40 of the rigid members and cylinders 64 attached to the frame.
  • the air cylinder provides a primary moving member of the driving means and moves the cable 56 along channel 54 to move the guide 52 along an arcuate path around the inside of the rigid member 32.
  • Each movable guide 52 is movable alternately, in one direction and then in the other, into all four quadrants of the arcuate portion 38 of its rigid member 32.
  • each movable guide moves around the arc of a circle transversely to the general feedpath of conductor pairs and angularly for more than 270° around the center of curvature of the arcuate path.
  • the angle is actually about 310° with regard to the center of radius of each of the arcuate portions 38.
  • each movable guide is dictated by the stroke of the piston in the cylinder, but in any case cannot extend beyond the limits of the arc length of radial opening 60 to the guide channel 54.
  • the rigid members are disposed with cylinders 64 inclined. In these positions, the radial openings 60 extend around the arcuate portions 38 between positions 'A' and 'B'. Compare Figures 5 and 6 particularly. Thus the movable guides cannot move upwardly beyond these two positions.
  • Each of the movable guides 52 is a short cylinder ( Figure 4) of smooth and hard wearing surface material, such as steel with an a dized polymer impregnated surface or ceramic coat, or possibly tool steel.
  • the inner bore blends smoothly with the ends of the cylinder with a small radius 68 to eliminate any sharp edges to the cylinder.
  • the device 28 also comprises guide means disposed upstream of the position changing means to guide conductor pairs 10 into the volumetric space 36 and to feed them into their respective guides 52.
  • This guide means is fixed and is essentially constructed to locate guide surfaces in such relative positions to avoid twisting together of conductor pairs as they pass through the volumetric space 36 and during movement of the guides 52 along their arcuate paths.
  • This guide means comprises a guide bar 70 which, as shown in Figures 2 and 3, slopes with regard to the general feedpath for the conductor pairs and also with regard to the plane of each of the arcuate portions 38 of the rigid members 32.
  • the guide bar 70 is formed with a plurality of guide apertures 72, these aper­tures being spaced apart from end-to-end of the guide bar. The apertures succeed each other downstream in the same downstream order as their associated position changing means.
  • the angle of inclination of the guide bar 70 is such that after conductor pairs have been fed through their respective guide apertures 72 and through their respective guides 52, then movement of the guides 52 along their arcuate paths randomly and out-of-phase with each other, causes no twisting together of the conductor pairs
  • each of the guides 52 moves around an arc 73 of approximately 310° around the center of its circular path and between positions 'A' and 'B' (compare Figures 5 and 8) so that its conductor pair 10 (shown chain dotted in Figure 8) sweeps around the surface of an asym­metrical cone (for instance shown at 74, 75 and 76 in Figures 7 and 8).
  • each cone coincides with the outlet or downstream side of the respective apertures 72. If the parts of conical surfaces unswept by conductor pairs are located correctly with regard to the guide bar 70 then all of the conductor pairs will move in an arc which avoids a top central region 78 between positions 'A' and 'B' and which accommodates the apices 80 of all of the conductor pairs downstream from it. In this way, although the conical surfaces of pair movement are telescoped within one another, contact between any conductor pair and a downstream pair is avoided by the simple fact that each upstream pair moves around the surface of a cone which lies completely outside the surfaces of all of the swept cones downstream from it. Thus a simple method is provided of producing random movement of the conductor pairs around their respective arcs while ensuring that the conductor pairs avoid each other.
  • the device 28 Downstream from the assembly of position changing means the device 28 comprises an array forming member 82 ( Figures 2 and 3) located in a plane transversely of the general direction of the feedpaths for holding the conductor units on their feedpaths in an arcuate array.
  • the array forming member 82 is a toroid which is disposed coaxially with regard to the assembly of position changing means and has an outside diameter which is greater than the outside diameter of each of the arcuate portions 38.
  • the surface of the array forming member 82 is of a hard wearing resistant material.
  • the array forming member may be formed from steel or aluminum which is suitably coated with a ceramic or has an anodized polymer impregnated surface for instance. Downstream from the array forming member 82 is the closing die 16.
  • each conductor pair In use of the apparatus 10, the individual conduc­tor pairs are fed from their respective reels 12 and each pair is passed through its respective guide passage 72 which guides the pair through the volumetric space 36 and then through its movable guide 52.
  • each conductor pair then emerges from the downstream end of its guide 52 and passes immediately between its own and the next immediately downstream arcuate portion 38, i.e. through adjacent downstream gap 34, before proceeding axially along the downstream position changing means while being radially disposed outwardly from them.
  • the conductor pairs then pass around and into contact with the outside of the array forming member 82, before moving through the closing die 16.
  • the pairs pass through the binder head 18 to form the core unit 14 which then passes to the take-up reel 26.
  • each of the air cylinders 64 is individually operated, possibly with computer control to move the cables 56 and thus the movable guides 52, each in a particular individual reciprocating manner and individual speed around the arcuate portions 38.
  • the movement of each of the movable guides 52 is completely unrelated to the movement of any of the other movable guides with regard to speed or position. Further to this, the speed of any of the movable guides may be changed at any instant as required.
  • each conductor pair is caused to sweep around the surface of its asymmetrical cone (e.g. cones 74, 75 and 76 in Figure 7) as it moves through the volumetric space 36.
  • each of the conductor pairs may be forced to follow a sweeping path of movement for a maximum angle of ap­proximately 310° around the center of radius of the arcuate portion 38 of its respective rigid member 32 and this effectively moves the conductor pairs circumferentially around the array forming member 82 as they proceed towards the closing die 16.
  • This angle may be below 310° for any particular pair as decided by the length of stroke in the associated cylinder under computer control. While it has been found that the movable guides 52 tend to position the conductor pairs generally in a particular circumferential region upon the array forming member 82 at any particular instant, the position of any conductor pair within a specific circumferential arc tends to be rather random.
  • each conductor pair is in a completely randomized position at any instant with regard to other conductor pairs and its movement characteristics are unre­lated to those of other pairs. It is also ensured that at least some and preferably all conductor pairs move constantly in reciprocating manner through the four quadrants of the finished core unit as the pairs extend along the core unit.
  • the combination of the plurality of position changing means, fixed guide means and array forming member in apparatus of the invention may be made particularly small with regard to the important function which it is to perform.
  • the total length of the device 28 is about 138 cms while the diameter of the arcuate portions 38 of rigid members 32 is approximately 25 cms.
  • the axial distance along the in series position changing means 30 is approximately 60 cms.
  • the apparatus is particularly small, it is particularly effective in obtaining the type of randomized movement of the conductor pairs into the four quadrants of a core unit which will provide a construction to minimize the disadvantageous crosstalk and electrical effects which are found with the side-by-side location of conductor pairs in a conventional core unit.
  • the structure which is otherwise as described for the first embodiment has a device 84 for changing the relative positions of conductor pairs in a core unit and which comprises a rigid cylindrical support 86 ( Figure 9).
  • This support is formed with spaced circumferen­tial slots 88 which extend around the support for angles in excess of 300° to provide arcuate ring sections 90 joined together by a remaining axially extending part of the support or backbone 92.
  • the spaced ring sections 90 and the backbone 92 surround a volumetric space 94.
  • each ring 96 is held axially upon its ring section 90 in this embodiment by screws 98 received screw-threadedly secured within a hole through the ring, the screws passing into a circumferential groove 100 around the ring section 90 and having inner screw ends shaped for sliding reception within the groove.
  • the rings 96 are formed with convex upstream surfaces 102 and the ring sections 90 with convex downstream surfaces 104 to assist in passage of conductor pairs 10 through the gaps between the ring sections 90 formed by the slots 88.
  • the ring sections 90 and rings 96 are smooth surfaced for hardness and wear resistance and may be of the material and surface finish of the rigid members 32 of the first embodiment.
  • a movable conductor pair guide 106 is securely mounted upon the outer surface of each ring 96, the guide being similar to the structure of the guides 52 in the first embodiment.
  • Driving means is provided for each movable guide 106.
  • Each driving means comprises a driven gear 108 formed on the downstream side of the associated ring 96 ( Figure 10) and concentric with it, and a driving gear 110 ( Figure 9) in mesh with gear 108 and rotatably mounted upon the backbone 92 of cylindrical support 86.
  • Each gear 110 is drivable by a vertical shaft 112 of the driving means which also includes an individual primary drive for the shaft.
  • This primary drive may be an electrically controlled pneumatic device (not shown) or a quick reversing electric motor (not shown). Reversal of each device and thus of its ring 96 is effected at the end of ring rotation in each direction by a rotation position device.
  • Such devices include an inductance measuring device operable by a trigger element mounted upon the ring 96 or by a reed switch. As such devices are well known, further detail is deemed unnecessary.
  • the device 84 also has a fixed guide bar 114 and an array forming member 116 of similar structure to guide bar 70 and member 82 of the first embodiment.
  • the conductor pairs extend through individual guide passages in guide bar 114, through volumetric space 94 and then each pair passes through an individual gap created by the slot 88 formed immediately upstream from the movable guide 106 through which the pair 10 passes.
  • Each pair continues along its passline from its movable guide 106 and around the array forming member then to proceed through the closing die and binding head to the take-up reel as described in the first embodiment.
  • the rings 96 are rotated by the stepper motors 110, alternately in one direction and then in the other to render the guides 106 movable around the axis of cylindrical support 86. During this movement each of the conductor pairs 10 while passing through its respective gap formed by a slot 88 is also caused to move around the slot in a circumferential direction.
  • the conductor pair positions and lateral movement as they pass over the array forming member 116 are completely unrelated to one another from one pair to another while each pair is desirably caused to move into each quadrant of the finished cable.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP19880301529 1987-03-27 1988-02-23 Manufacture of telecommunications core units Withdrawn EP0284204A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA533213 1987-03-27
CA533213 1987-03-27

Publications (1)

Publication Number Publication Date
EP0284204A1 true EP0284204A1 (en) 1988-09-28

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Application Number Title Priority Date Filing Date
EP19880301529 Withdrawn EP0284204A1 (en) 1987-03-27 1988-02-23 Manufacture of telecommunications core units

Country Status (3)

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EP (1) EP0284204A1 (fi)
JP (1) JPS63257133A (fi)
FI (1) FI881444A (fi)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530726A (en) * 1948-12-16 1950-11-21 Bell Telephone Labor Inc Cable stranding machine
DE1914133B2 (de) * 1969-03-20 1973-06-20 Kabel und Metallwerke Gutehoff nungshutte AG, 3000 Hannover Verfahren zur herstellung von fernmeldebuendelkabeln
US3757505A (en) * 1970-02-25 1973-09-11 Ericsson Telefon Ab L M Apparatus for changing the relative position of the conductors during the manufacture of a telecommunication cable
GB1502644A (en) * 1974-02-08 1978-03-01 Nippon Telegraph & Telephone Telecommunication cable and method and apparatus for manufacturing the same
US4712368A (en) * 1987-03-30 1987-12-15 Northern Telecom Limited Manufacture of telecommunications cable core units

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530726A (en) * 1948-12-16 1950-11-21 Bell Telephone Labor Inc Cable stranding machine
DE1914133B2 (de) * 1969-03-20 1973-06-20 Kabel und Metallwerke Gutehoff nungshutte AG, 3000 Hannover Verfahren zur herstellung von fernmeldebuendelkabeln
US3757505A (en) * 1970-02-25 1973-09-11 Ericsson Telefon Ab L M Apparatus for changing the relative position of the conductors during the manufacture of a telecommunication cable
GB1502644A (en) * 1974-02-08 1978-03-01 Nippon Telegraph & Telephone Telecommunication cable and method and apparatus for manufacturing the same
US4712368A (en) * 1987-03-30 1987-12-15 Northern Telecom Limited Manufacture of telecommunications cable core units

Also Published As

Publication number Publication date
JPS63257133A (ja) 1988-10-25
FI881444A (fi) 1988-09-28
FI881444A0 (fi) 1988-03-25

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