CA1151024A - Forming stranded stock - Google Patents
Forming stranded stockInfo
- Publication number
- CA1151024A CA1151024A CA000363057A CA363057A CA1151024A CA 1151024 A CA1151024 A CA 1151024A CA 000363057 A CA000363057 A CA 000363057A CA 363057 A CA363057 A CA 363057A CA 1151024 A CA1151024 A CA 1151024A
- Authority
- CA
- Canada
- Prior art keywords
- bundle
- stranding
- capstan
- holding
- point
- 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.)
- Expired
Links
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
- H01B13/0003—Apparatus or processes specially adapted for manufacturing conductors or cables for feeding conductors or cables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/14—Aprons, endless belts, lattices, or like driven elements
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
- Ropes Or Cables (AREA)
Abstract
D-6451a (Kab) FORMING STRANDED STOCK
Plural strands, e.g., conductors, having a particular cross section, are drawn off spool, run through straightening rolls, and are combined in a bundle in a first stranding point. Brackets on a caterpillar-like capstan grip the bundle and hold it while turning the bundle on the stranding axis. The bundle continues toward a second stranding point spaced particularly from the cap-stan. The stationary (nonrevolving) stranding pints can be estab-lished by nipples or by additional, nonrevolving capstans, in which case slidable brackets are used to compensate speed differentials.
The revolving capstan may rotate continuously or reverse periodi-cally to obtain different types of stranding patterns.
Plural strands, e.g., conductors, having a particular cross section, are drawn off spool, run through straightening rolls, and are combined in a bundle in a first stranding point. Brackets on a caterpillar-like capstan grip the bundle and hold it while turning the bundle on the stranding axis. The bundle continues toward a second stranding point spaced particularly from the cap-stan. The stationary (nonrevolving) stranding pints can be estab-lished by nipples or by additional, nonrevolving capstans, in which case slidable brackets are used to compensate speed differentials.
The revolving capstan may rotate continuously or reverse periodi-cally to obtain different types of stranding patterns.
Description
Background of the Invention The present invention relates to continuously stranding elongated stock such as conductors, etc., particularly of the variety having larger cross-section and/or complex profiles in crosssection, to obtain a stranded cable, rope or the like.
Equipment for stranding elongated stock, particularly of the heavy variety, uses storage drums or spools from which the stock is continuously paid, and these drums or spools are mounted on a rotating device. The individ-ual strands of stock are run together at a stranding point and stranded. If the strands themselves are stranded filaments or the like, a higher order stranding element is produced.
It is inevitable that the known stranding machines require movement of heavy components which limits the production speed. Furthermore, the known equipment requires an inordinate amount of space while the storage capacity for the stock being stranded together is quite limited. These features, in turn, limit the length of the product being made. A typical stranding device is shown, e.g. in United States-Letters Patent No. 3,106,815.
The aforementioned drawbacks have been attempted to be allev~ated by means of stranding the stock with reversing pitch. Each strand is guided by particular means which reverse rotation (see German printed patent application ~"
llSlOZ4 No. 25 14 033). The resulting equipment is indeed more economical and requires less space, and less consideration can be given to inertia forces resulting from rotation. Also, set up and preparation times are considerably reduced.
The known equipment as referred to in the preceding paragraph are disadvantaged by torsion forces in strands of larger cross-section. If the strands are insulated, the insulation may be damaged. In the case of cableJ
damage to the insulation cannot be tolerated.
Description of the Invention It is an object of the present invention to strand elongated stock to obtain a stranded configuration, such as a cable, a rope or the like, which is free from the deficiencies outlined above and wherein particularly the strands are not damaged in the process.
It is another object of the present invention to obtain a stranded product on a continuous basis and with little expenditure in machinery and operating personnel.
In accordance with one aspect of the invention there is provided an apparatus for stranding elongated stock, comprising:
a plurality of stationarily mounted, reelable support spools storing individual strands to be unwound from the spools upon rotation thereof;
means for combining the strands as unwound in a bundle and for providing a first stranding point through which the bundle passes;
means disposed for positively holding the strands of the bundle as a bundle for a particular travel path as the bundle moves along the travel path together and in engagement with the means for holding, said means for holding revolving about said axis in alternating direction for stranding the strands together about an axis at opposite twist, outside the travel path between the means for positively holding and the first stranding point, stranding does not occur on and along the particular travel path due to said positive holding;
reversible drive means and control means for the reversible drive means for driving said means for holding;
means defining a second stranding point through which the stranded bundle passes by operation of rotation as between the means for positively holding and the second stranding point being spaced from the means for holding by a distance being an even-numbered multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the first and second stranding points, the means for holding engaging the bundle as so moved through the travel path without stranding a portion of the bundle while on the travel path due to the positive holding.
In accordance with a second aspect of the invention there is provided an apparatus for stranding elongated stock, comprising:
a plurality of spools, storing individual strands to be unwound from the spools;
means for combining the strands, as unwound from the spools, in a bundle and providing a first, relatively nonrotating stranding point;
capstan means, including plural clamping bracket means, each engaging the bundle positively and moving with the bundle for a particular travel path before disengaging from the moving bundle;
means defining a second nonrotating stranding point, said capstan means being disposed between the first and second stranding point, the second stranding point being spaced from the capstan means by a particular distance;
reversible drive means for causing the capstan means to rotate to obtain stranding of the bundle as between the first stranding point and a point of engagement of the bundle with one of the clamping means, and to obtain additional stranding as between a~point of engagement of the bundle with another one of the clamping means, just prior to release of the bundle by the latter clamping means and the second stranding point, there being no stranding of a portion of the bundle as between the one clamping means and the other clamping means on account of said positive engaging of the bundle;
control means for reversing said drive means, said particular distance being an even number multiple of the travel path of the bundle in llSlOZ4 between reversals by the control means; and means for moving the bundle through the stranding points and the travel path as the bracket means engage the moving bundle.
The means for gripping and holding will preferably include plural brackets which grip and clamp the bundle in pairs, hold it positively for a certain length of common travel and release it thereafter, but all the while revolving about the stranding axis. The brackets, or bracket elements, may be mounted on two endless belt-like carriers constructed in caterpillar fashion and each carrying the spaced brackets. These brackets cooperate in pairs, one per carrier of each pair, to hold and grip the bundle, whereby the brackets of each pair close on the bundle as it arrives, hold it without twisting, and carry it along for the storage length, and release it as the brackets return.
Positive gripping of the bundle avoids damage to the surface of the strands.
In a preferred form, the bracket elements are mounted on endless chains and are configured to function in pairs in a gear-like fashion. One bracket element of a pair has a detent, the other one carries an elastic pin which is received by the detents of the other element as long as they run together in a common path into which the bundle is fed and is being held by the pin and against the detent.
These carriers (such as endless chains) and the brackets thereof constitute a capstan being preferably mounted in a frame ~151024 and rotating about the stranding axis and more or less frequently reverses the rotation to reverse the pitch. This way, one obtains the S-Z pattern. For reasons below, and considering S-Z stranding, the second stranding point is to be spaced from the means for gripping and holding by a distance which is an even-numbered multiple of the length of the bundle in between twist reversals which may coincide with the length the bundle is held. The revolving speed may differ in the two directions resulting in different pitch values. Also, the number of unidirectional turns or, more generally, the total angular displace-ment of the revolving capstan in between reversals may be different in the two 10 directionS
The bundling of the strands can be separated from the first stranding point by means of another capstan which grips and holds the bundle for a cer-tain length but does not rotate. Upon adjusting and synchronizing the capstans, particularly as far as opening and closing of brackets is concerned, the length of the bundle between the capstans in any instant can be made constant. Anal-ogously, the second stranding point downstream from the revolving capstan can be established by another capstan. The spacings between the capstans may be varied to change the lay and pitch of twisting. However, the rule concerning spacing between the second stranding point and the end of the revolving capstan should be observed (even multiple of the travel length between reversals). The purpose thereof is, briefly, the following. In the case of so-called S-Z
stranding, it was observed that the stranded bundle has a certain waviness.
That deficiency is of no consequence operationally, for example in the case of a cable; but the cable has a rather odd, unpleasant appearance and may be dif-ficult to handle. Appearance and ease of handling are improved if the spacing between the revolving capstan and the second stranding point is an even-numbered multiple of the travel path length for the bundle in between reversals.
If three such capstans are disposed in series, only the middle one revolving, the propagation speed of the stock from capstan to capstan reduces in downstream direction. All three capstans should be driven at the same con-stant speed for reasons of ensuring the requisite synchronization. The brack-ets should be mounted on the carriers to permit additional longitudinal move-ment during the time of engagement with the stock to compensate the above-men-tioned speed differential of the stock.
Downstream from the second stranding point, one may wrap a ribbon or the like around the cable for preventing untwisting. However, upon holding and stranding the twisted stock, e.g. by a downstream, non-revolving capstan, such wrapping may not be needed. Additionally or alternatively, a second lay may be stranded on top of the stock after leaving the device described above.
As far as further improvement is concerned, it was found advisable to jacket the bundle already upstream from the second stranding point, downstream from the revolving capstan. Jacketing may include extruding a layer and fil-ling the gaps between the stranded elements, and it may further include wrap-ping a ribbon around the bundle, possibly prior to extrusion. Also, the bundle may be marked at that point in a suitable fashion.
Stranding may be carried out in steps in that a second revolving cap-stan is provided downstream from the first revolving one, but rotating in op-posite direction. This way, the lay (pitch) is doubled. If the two capstansrevolve uniformly, the path between them serves as temporary storage.
In special cases, it may be desirable to open and reclose the brack-ets; during the open period they change their azimuthal position relative to the bundle. The brackets, therefore, will exert torsion upon the bundle for twisting it intermittently only which results in a non-uniform speed of strand-ing.
The preferred embodiment of the invention, the objects and features of the invention, and further objects, features and advantages thereof, will be l~`S1024 better understood from the following description taken in connection with the accompanying drawings~
Description of the Drawings Figure 1 is a schematic view of an apparatus for stranding stock in sccordance with the preferred embodiment of the invention;
Figure 2 is a schematic view of a different modification;
Figure 3 is a view similar to Figure 1, but showing details of a fur-ther improvement; and Figure 4 is a schematic but still more detailed view of an improved example for a capstan that can be used in any of the apparatus' described in the several figures.
Proceeding now to the detailed description of the drawings, Figure 1 illustrates several drums or spools 2, journalled for rotation about their own axis, but being otherwise stationarily mounted in a plant or the like. Indi-vidual strands 1 are taken from these drums or spools and pass through sets of straightening rollers 3. The straightened and, possibly, oriented strands 1 are fed to a stranding head or nipple 4 which, in the essence, combines the strands in a bundle la. The number of strands to be bundled and stranded is, of course, not limited to three.
The bundle la is received by the stranding device 5 arranged down-stream from nipple or head 4. The device 5 is essentially constructed as a capstan being comprised of two endless chains 6 carrying clamping jaws or brack-ets 7, which cooperate in pairs, one jaw or bracket per chain of each pair. The brackets grip the bundle positively in from closed engagement. The chains are driven by drives 8 and synchronized as to speed and phase by a linking belt, sprocket belt 16 or the like. Reference numeral 9 refers to reversing pulleys or sprockets for each chain.
The capstan chains with brackets, drives and reversing rolls 9 are ~5~024 mounted in a frame 10 having hollow shafts which are journalled in bearings 11 and 12, to permit rotation of the frame so that the capstan S revolves about the stranding axis. The frame is driven by a motor 14 such as a d.c. four quadrant motor, in that the motor drives a transmission gear 15 which, in turn, drives a belt, sprocket chain or the like, 13.
The motor 14 is a reversible one (or the transmission is constructed for reversing the direction of rotation), reversal being provided by a control-ler 14a, so that the frame and stranding device 5 can rotate in one or the op-posite direction as indicated by the two arrows. If stranding is carried out without reversing pitch, a reversibility of the drive is not required. The dis-tance between the capstan and the head 4 may be adjustable to vary the lay, i.e.
the number of twists per unit length. The drives 8 could be disposed outside of the frame so that they do not revolve with the capstan proper. A transmission is needed in this case to drive the chains whereby the chain speed is the com-posite of drive speed and revolving speed.
A second stranding head or nipple 17 is disposed downstream from de-vice 5, behind which a ribbon 19 is helically wrapped around the stranded con-ductors. A spool 18 from which the ribbon 19 is paid, revolves about the stranding axis thereby rotating about its own axis as the ribbon is paid and wrapped.
The device operates as follows. The strands 1 may be regular solid conductors or stranded conductors to obtain a higher order of stranding. The invention is of particular interest for stranding particularly pro-filed con-ductors having, e.g. pie-shaped cross-sections. The conductors may be insulated so that gentle handling of the insulation envelope is required. In either case, the conductors 1 are reeled off the drums or spools 2 and pass through straight-ening rollers 3. The rollers in each set are staggeredly arranged and they are ori-ented to straighten the conductors and to orient, for example, each sector in _ g _ 11S~024 accordance with the position it is to have in the bundle. Straightening is par-ticularly important if the strands have solid and rather large cross-sections.
Sector or pie-shaped conductors are notably stiff and require straightening.
The bundle la results from the combining action by nipple or head 4.
The two chains 6 run continuously so that each bracket is moved in a position vis-a-vis another one and together they grip the incoming bundle la, hold it for a certain distance, whereafter the brackets open. The brackets grip the bundle positively without permitting relative movement between the strands and the bracket elements. The surface area of contact must be chosen to be suffi-ciently large so that the per unit surface area clamping force is not too high.This aspect is also important for ensuring that only very low torsion fo~ces act on the insulation. It must not be forgotten that stranding does require the exertion of twisting torsion upon the conductors underneath the insulation.
During the period of time in which the stock is held by brackets, the frame 10 rotates about the stranding axis so that each bracket pair closes about the bundle in a disposition which is angularly offset by a particular amount with regard to the disposition the frame had when the preceding bracket pair closed about the bandle. The number of twists as so imparted depends on the di-mensions of the apparatus, on the relative speed of stock and the revolving cap-stan, and on the distance between capstan 5 and head 4. As stated, one maystrand the conductors in the so-called ~eander pattern, in which each twisting turn covers at the most 360 in between reversals. Reversals after 180 are quite common in other cases. Less frequent reversals result in the so-called S-Z pattern, wherein the conductors are stranded about each other in several helical turns, before the sense of winding and direction of stranding is changed for plural turns in the opposite direction, etc. The pattern actually results by cho~singthe instants and phases of reversing the capstan revolution.
The brackets hold the conductor bundle immobile in the capstan, except for the movement forced upon the bundle at the point of engagement with the brackets on account of the translatory and revolving movement of the brackets.
Therefore, upon being released, but while traveling from the point of release to nipple 17~ an additional twist is provided because the bundle upstream is held by a still closed pair of brackets which continues to revolve. One ob-tains, therefore, a double-twist stranding.
The wrapping device 18 provides the stranded stock with a helical winding for preventing the stranded conductors from untwisting. The stranded and wrapped stock can be processed further downstream, for example, by extrud-ing insulation on and around the assembly or by jacketing the assembly other-wise. Particularly, the stranded stock can be used as a core, about which are twisted further strands.
It should be noted that the effective stranding length is a continu-ously variable one. A certain length of the bundle la is twisted in any instant by cooperation of head 4 and a pair of brackets 7. When the two brackets of a pair close about the bundle, they have a particular distance from the nipple 4 and begin to twist the portion of the bundle between brackets and head as a whole, while receding from the nipple on account of the chain movement. The effective stranding length is, therefore, continuously lengthened until the next pair grips the bundle etc. In cases, this variation in effective length may be deemed undesirable.
Figure 2 illustrates how the temporary storage capacity of the strand-ing equipment itself can be increased without interfering with the features out-lined above. The elements 30, 31, 32 and 33, respectively, correspond to parts 1, 2, 3 and 4 in Figure 1, producing a bundle 34 to be stranded downstream from nipple 33. The bundle is gripped by a first revolving capstan 35 constructed and operated like capstan 5 above. Downstream from capstan 35 is provided an-other revolving capstan 36. Another strand nipple 37 is provided downstream from capstan 36~ Stranding is provided between the nipples and the capstans which run in synchronism. Of course, they should also reverse simultaneously.
Reference numeral 38 refers again to a device for wrapping the stranded stock.
This machine, employing two revolving capstans, establishes a vari-able storage capacity for the stock. The capacity can be varied by varying the distance between the two capstans 35, 36. This feature, in turn, permits the selection of the lays number of the stranding in one direction. The capstan 36 does not have to revolve at the same speed as capstan 35. Moreover, the two capstans 35 and 36 may actually revolve in opposite directions.
A specific improvement will now be explained with reference to Figure 3 which improvement is basically applicable to all of the several examples above. Plural strand elements 50 are paid from a stationary supply ~rotating drums); these elements may be of large, e.g., section-shaped cross sections, or each one of the elements 50 may be a conductor composed of stranded filaments, i.e. stranded wire bund-les. Guide sheaves or pulleys 52 run these strand ele-ments to a stranding head 53 defining the first stranding point. Rolls or pul-leys 52 may also be provided here for stretching and/or straightening of the elements 50 prior to entering the first stranding head.
Head 53 combines the stranding elements in a bundle and feeds them to a stranding device 54 placed downstream from this first stranding point. The stranding device 54 is comprised of two-serial, caterpillar-type capstans 55 and 56, any of which is shown in greater detail in Figure 6 and will be de-scribed more fully below. Suffice it to say that each capstan includes bracket elements which grip the bundle 67, hold it for a certain storage path length and release it again.
As described earlier and quite analogously, each of the capstans 55 and 56 revolve on and about the longitudinal stranding axis, either continu-ously, or in alternating directions, e.g., for obtaining S-Z type stranding.
- 12 _ For example, the direction may be changed whenever the bundle has traversed a distance equal to the storage length in the capstans 55 and 56. The twisted bundle as held by the capstans 55 and 56 is not twisted or stranded further while being so held. This path and storage length for the bundle extends spec-ifically from the point where a bracket of capstan 55 grips the arranging bun-dle up to the point where a bracket of capstan 56 releases the bundle. This storage length is denoted Qsp The stranded bundle as released by capstan 56 is fed through a wrap-ping device 57 which wraps a holding and retaining ribbon around the stranded bundle. Moreover`, the device 57 may include an extruder, extruding a suitable synthetic around it and into the gaps between the stranded elements to, there-by, embed the stranded elements into an inner core. The wrapping will occur upstream from the extrusion. In addition, the bundle as so jacketed -may be suitably marked for identification.
A second stranding point, 58, is established downstream from dev-i~e 57. This particular stranding point is also a caterpillar-like capstan, ex-cept that it does not revolve on the stranding axis. Thus, the bundle receives an additional twist in the space between revolving capstan 56 and nonrevolving capstan 58. Neither extruCion nor ribbon wrapping will interfer with the addi-tional stranding.
The stranded stock is redirected by a sheave 60 and wound onto a drum61. This is the simplest operation after the stranding. However, additional working steps may be performed on the stranded stock. For example, an armoring may be provided around the stranded bundle, and an outer jacket may be extruded, this jacket to be made of a wear-resistant material such as PVC.
The point in which a bracket of capstan 58 engages the bundle 59 is spaced from the point in which a bracket or capstan 56 releases the bundle by a distance equal to 2nQr, wherein n is a positive integer and Qr is the dis-tance the bulldle travels in between reversals for stranding in an S-Z pattern.
The storage length Qs in the capstan may be equal to that length Qr. The total distance chosen, as between capstan 56 and the second stranding point, depends upon particulars of the desired stranding. As stated above, the stranding 59 will have zero waviness, or remains very small, for the following reasons.
In the example of Figure 3, it is assumed that the first stranding point is placed rather closely to the capstan 55. Moreover, it is assumed that capstans 55 and 56 revolve in one particular direction for the time it takes a bundle increment to traverse the storage path length Qsp' whereupon the direc-tion of rotation is reversed for a like period. This way, one alternates be-tween S-twists and Z-twists and Qr = Qsp In this specific example, the second stranding point (entrance to capstan 58) is located at a distance from capstan 56 which is equal to twice the reversal length. Thus, in any instance equal quantities of S-twists and Z-twists ~i.e., one each) is located in this second stranding path. Mathem-atically speaking, the total twist on the path from capstan to second stranding point is always zero. The Figure 1 shows an instant in which the device just about reverses from Z-twist to S-twist. Accordingly, the Z-twist portion that now will gradually enter and pass through the second stranding point (58) will be gradually untwisted, but additional S-twist is imparted upon the S-twist portion. That additional S-twist is removed again from the bundle when and after the direction of revolving the capstans 55 and 56 is again reversed to-ward producing a Z-twist. As a consequence, the objectional waviness is, in fact, reduced. It was found moreover that waviness is reduced more for still longer lengths, i.e., spacing between revolving capstan and downstream strand-ing point. However, the spacing must be an even multiple of the distance any bundle increment travels in between reversals.
Figure 4 shows one of the capstans, which may be any of the capstans 5, 35, and 36 bearing in mind, however, that in some instance bracket mounts should be used to compensate differences in speed of the stock along the prop-agation path. On the other hand, the speed of the chain drive motors such as 66 and 66a could be controlled accordingly. This particular capstan is basical-ly comprised of two chains, 64 and 64a respectively looped around pairs of sprockets, 65 and 65a. One sprocket in each instance is driven by a drive, 66 and 66a, respectively. Bracket and jaw elements 62 are mounted to these chains in a particular distance from each other, but in such a way that these jaw and bracket elements face each other for gripping cooperation of the bundle. The bracket elements have detents 70, and elastic pins 68 are inserted in and àf-fixed to the detents of the bracket elements on chain 64. The pins are prefer-ably made of rigid high-density polyethylene.
The elements 62 are fastened to the chains by means of suitable fas-teners-63. These fasteners are centered with respect to pins 68, and vice versa; also, the fasteners on chain 64 are centered to the detents 70 of the respective jaw~nd bracket elements 62 on that chain. Thus, the pins 68 will engage oppositely located detents in gear-like fashion (see center line 71 in one instance). Also, the centers of the pins 68 run along a particular path 69 which merges with the corresponding path 69a of the other chain. Those are the paths of contact of the capstan with the stranded bundle 67 runs in these merging path portions and is positively engaged by the pins 68 and the respec-tive opposing detents 70, matching the pins' contours. Engagement is analogous to holding a chuck and resemble a gear engagement.
The positive engagement of pins and detents of opposing bracket ele-ments ensures automatically uniformity in the movement of both chains; an equal-ization gear, or the like, is not needed. Of course, the two drives should be adjusted toward uniform motion as accurately as possible. This arrangement is particularly advantageous in the case of a revolving capstan (55, 56, 35, 36, 1~51024 etc.) as it permits both chain systems of the capstan to have similar mass.
Also, the armatures of the t~o drives 66 and 66a can be electrically connected in parallel so that the motors can be controlled, e.g., electronically in a very simple fashion.
S The invention is not limited to the embodiments described above; but all changes and modifications thereof, not constituting departures from the spirit and scope of the invention, are intended to be included.
Equipment for stranding elongated stock, particularly of the heavy variety, uses storage drums or spools from which the stock is continuously paid, and these drums or spools are mounted on a rotating device. The individ-ual strands of stock are run together at a stranding point and stranded. If the strands themselves are stranded filaments or the like, a higher order stranding element is produced.
It is inevitable that the known stranding machines require movement of heavy components which limits the production speed. Furthermore, the known equipment requires an inordinate amount of space while the storage capacity for the stock being stranded together is quite limited. These features, in turn, limit the length of the product being made. A typical stranding device is shown, e.g. in United States-Letters Patent No. 3,106,815.
The aforementioned drawbacks have been attempted to be allev~ated by means of stranding the stock with reversing pitch. Each strand is guided by particular means which reverse rotation (see German printed patent application ~"
llSlOZ4 No. 25 14 033). The resulting equipment is indeed more economical and requires less space, and less consideration can be given to inertia forces resulting from rotation. Also, set up and preparation times are considerably reduced.
The known equipment as referred to in the preceding paragraph are disadvantaged by torsion forces in strands of larger cross-section. If the strands are insulated, the insulation may be damaged. In the case of cableJ
damage to the insulation cannot be tolerated.
Description of the Invention It is an object of the present invention to strand elongated stock to obtain a stranded configuration, such as a cable, a rope or the like, which is free from the deficiencies outlined above and wherein particularly the strands are not damaged in the process.
It is another object of the present invention to obtain a stranded product on a continuous basis and with little expenditure in machinery and operating personnel.
In accordance with one aspect of the invention there is provided an apparatus for stranding elongated stock, comprising:
a plurality of stationarily mounted, reelable support spools storing individual strands to be unwound from the spools upon rotation thereof;
means for combining the strands as unwound in a bundle and for providing a first stranding point through which the bundle passes;
means disposed for positively holding the strands of the bundle as a bundle for a particular travel path as the bundle moves along the travel path together and in engagement with the means for holding, said means for holding revolving about said axis in alternating direction for stranding the strands together about an axis at opposite twist, outside the travel path between the means for positively holding and the first stranding point, stranding does not occur on and along the particular travel path due to said positive holding;
reversible drive means and control means for the reversible drive means for driving said means for holding;
means defining a second stranding point through which the stranded bundle passes by operation of rotation as between the means for positively holding and the second stranding point being spaced from the means for holding by a distance being an even-numbered multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the first and second stranding points, the means for holding engaging the bundle as so moved through the travel path without stranding a portion of the bundle while on the travel path due to the positive holding.
In accordance with a second aspect of the invention there is provided an apparatus for stranding elongated stock, comprising:
a plurality of spools, storing individual strands to be unwound from the spools;
means for combining the strands, as unwound from the spools, in a bundle and providing a first, relatively nonrotating stranding point;
capstan means, including plural clamping bracket means, each engaging the bundle positively and moving with the bundle for a particular travel path before disengaging from the moving bundle;
means defining a second nonrotating stranding point, said capstan means being disposed between the first and second stranding point, the second stranding point being spaced from the capstan means by a particular distance;
reversible drive means for causing the capstan means to rotate to obtain stranding of the bundle as between the first stranding point and a point of engagement of the bundle with one of the clamping means, and to obtain additional stranding as between a~point of engagement of the bundle with another one of the clamping means, just prior to release of the bundle by the latter clamping means and the second stranding point, there being no stranding of a portion of the bundle as between the one clamping means and the other clamping means on account of said positive engaging of the bundle;
control means for reversing said drive means, said particular distance being an even number multiple of the travel path of the bundle in llSlOZ4 between reversals by the control means; and means for moving the bundle through the stranding points and the travel path as the bracket means engage the moving bundle.
The means for gripping and holding will preferably include plural brackets which grip and clamp the bundle in pairs, hold it positively for a certain length of common travel and release it thereafter, but all the while revolving about the stranding axis. The brackets, or bracket elements, may be mounted on two endless belt-like carriers constructed in caterpillar fashion and each carrying the spaced brackets. These brackets cooperate in pairs, one per carrier of each pair, to hold and grip the bundle, whereby the brackets of each pair close on the bundle as it arrives, hold it without twisting, and carry it along for the storage length, and release it as the brackets return.
Positive gripping of the bundle avoids damage to the surface of the strands.
In a preferred form, the bracket elements are mounted on endless chains and are configured to function in pairs in a gear-like fashion. One bracket element of a pair has a detent, the other one carries an elastic pin which is received by the detents of the other element as long as they run together in a common path into which the bundle is fed and is being held by the pin and against the detent.
These carriers (such as endless chains) and the brackets thereof constitute a capstan being preferably mounted in a frame ~151024 and rotating about the stranding axis and more or less frequently reverses the rotation to reverse the pitch. This way, one obtains the S-Z pattern. For reasons below, and considering S-Z stranding, the second stranding point is to be spaced from the means for gripping and holding by a distance which is an even-numbered multiple of the length of the bundle in between twist reversals which may coincide with the length the bundle is held. The revolving speed may differ in the two directions resulting in different pitch values. Also, the number of unidirectional turns or, more generally, the total angular displace-ment of the revolving capstan in between reversals may be different in the two 10 directionS
The bundling of the strands can be separated from the first stranding point by means of another capstan which grips and holds the bundle for a cer-tain length but does not rotate. Upon adjusting and synchronizing the capstans, particularly as far as opening and closing of brackets is concerned, the length of the bundle between the capstans in any instant can be made constant. Anal-ogously, the second stranding point downstream from the revolving capstan can be established by another capstan. The spacings between the capstans may be varied to change the lay and pitch of twisting. However, the rule concerning spacing between the second stranding point and the end of the revolving capstan should be observed (even multiple of the travel length between reversals). The purpose thereof is, briefly, the following. In the case of so-called S-Z
stranding, it was observed that the stranded bundle has a certain waviness.
That deficiency is of no consequence operationally, for example in the case of a cable; but the cable has a rather odd, unpleasant appearance and may be dif-ficult to handle. Appearance and ease of handling are improved if the spacing between the revolving capstan and the second stranding point is an even-numbered multiple of the travel path length for the bundle in between reversals.
If three such capstans are disposed in series, only the middle one revolving, the propagation speed of the stock from capstan to capstan reduces in downstream direction. All three capstans should be driven at the same con-stant speed for reasons of ensuring the requisite synchronization. The brack-ets should be mounted on the carriers to permit additional longitudinal move-ment during the time of engagement with the stock to compensate the above-men-tioned speed differential of the stock.
Downstream from the second stranding point, one may wrap a ribbon or the like around the cable for preventing untwisting. However, upon holding and stranding the twisted stock, e.g. by a downstream, non-revolving capstan, such wrapping may not be needed. Additionally or alternatively, a second lay may be stranded on top of the stock after leaving the device described above.
As far as further improvement is concerned, it was found advisable to jacket the bundle already upstream from the second stranding point, downstream from the revolving capstan. Jacketing may include extruding a layer and fil-ling the gaps between the stranded elements, and it may further include wrap-ping a ribbon around the bundle, possibly prior to extrusion. Also, the bundle may be marked at that point in a suitable fashion.
Stranding may be carried out in steps in that a second revolving cap-stan is provided downstream from the first revolving one, but rotating in op-posite direction. This way, the lay (pitch) is doubled. If the two capstansrevolve uniformly, the path between them serves as temporary storage.
In special cases, it may be desirable to open and reclose the brack-ets; during the open period they change their azimuthal position relative to the bundle. The brackets, therefore, will exert torsion upon the bundle for twisting it intermittently only which results in a non-uniform speed of strand-ing.
The preferred embodiment of the invention, the objects and features of the invention, and further objects, features and advantages thereof, will be l~`S1024 better understood from the following description taken in connection with the accompanying drawings~
Description of the Drawings Figure 1 is a schematic view of an apparatus for stranding stock in sccordance with the preferred embodiment of the invention;
Figure 2 is a schematic view of a different modification;
Figure 3 is a view similar to Figure 1, but showing details of a fur-ther improvement; and Figure 4 is a schematic but still more detailed view of an improved example for a capstan that can be used in any of the apparatus' described in the several figures.
Proceeding now to the detailed description of the drawings, Figure 1 illustrates several drums or spools 2, journalled for rotation about their own axis, but being otherwise stationarily mounted in a plant or the like. Indi-vidual strands 1 are taken from these drums or spools and pass through sets of straightening rollers 3. The straightened and, possibly, oriented strands 1 are fed to a stranding head or nipple 4 which, in the essence, combines the strands in a bundle la. The number of strands to be bundled and stranded is, of course, not limited to three.
The bundle la is received by the stranding device 5 arranged down-stream from nipple or head 4. The device 5 is essentially constructed as a capstan being comprised of two endless chains 6 carrying clamping jaws or brack-ets 7, which cooperate in pairs, one jaw or bracket per chain of each pair. The brackets grip the bundle positively in from closed engagement. The chains are driven by drives 8 and synchronized as to speed and phase by a linking belt, sprocket belt 16 or the like. Reference numeral 9 refers to reversing pulleys or sprockets for each chain.
The capstan chains with brackets, drives and reversing rolls 9 are ~5~024 mounted in a frame 10 having hollow shafts which are journalled in bearings 11 and 12, to permit rotation of the frame so that the capstan S revolves about the stranding axis. The frame is driven by a motor 14 such as a d.c. four quadrant motor, in that the motor drives a transmission gear 15 which, in turn, drives a belt, sprocket chain or the like, 13.
The motor 14 is a reversible one (or the transmission is constructed for reversing the direction of rotation), reversal being provided by a control-ler 14a, so that the frame and stranding device 5 can rotate in one or the op-posite direction as indicated by the two arrows. If stranding is carried out without reversing pitch, a reversibility of the drive is not required. The dis-tance between the capstan and the head 4 may be adjustable to vary the lay, i.e.
the number of twists per unit length. The drives 8 could be disposed outside of the frame so that they do not revolve with the capstan proper. A transmission is needed in this case to drive the chains whereby the chain speed is the com-posite of drive speed and revolving speed.
A second stranding head or nipple 17 is disposed downstream from de-vice 5, behind which a ribbon 19 is helically wrapped around the stranded con-ductors. A spool 18 from which the ribbon 19 is paid, revolves about the stranding axis thereby rotating about its own axis as the ribbon is paid and wrapped.
The device operates as follows. The strands 1 may be regular solid conductors or stranded conductors to obtain a higher order of stranding. The invention is of particular interest for stranding particularly pro-filed con-ductors having, e.g. pie-shaped cross-sections. The conductors may be insulated so that gentle handling of the insulation envelope is required. In either case, the conductors 1 are reeled off the drums or spools 2 and pass through straight-ening rollers 3. The rollers in each set are staggeredly arranged and they are ori-ented to straighten the conductors and to orient, for example, each sector in _ g _ 11S~024 accordance with the position it is to have in the bundle. Straightening is par-ticularly important if the strands have solid and rather large cross-sections.
Sector or pie-shaped conductors are notably stiff and require straightening.
The bundle la results from the combining action by nipple or head 4.
The two chains 6 run continuously so that each bracket is moved in a position vis-a-vis another one and together they grip the incoming bundle la, hold it for a certain distance, whereafter the brackets open. The brackets grip the bundle positively without permitting relative movement between the strands and the bracket elements. The surface area of contact must be chosen to be suffi-ciently large so that the per unit surface area clamping force is not too high.This aspect is also important for ensuring that only very low torsion fo~ces act on the insulation. It must not be forgotten that stranding does require the exertion of twisting torsion upon the conductors underneath the insulation.
During the period of time in which the stock is held by brackets, the frame 10 rotates about the stranding axis so that each bracket pair closes about the bundle in a disposition which is angularly offset by a particular amount with regard to the disposition the frame had when the preceding bracket pair closed about the bandle. The number of twists as so imparted depends on the di-mensions of the apparatus, on the relative speed of stock and the revolving cap-stan, and on the distance between capstan 5 and head 4. As stated, one maystrand the conductors in the so-called ~eander pattern, in which each twisting turn covers at the most 360 in between reversals. Reversals after 180 are quite common in other cases. Less frequent reversals result in the so-called S-Z pattern, wherein the conductors are stranded about each other in several helical turns, before the sense of winding and direction of stranding is changed for plural turns in the opposite direction, etc. The pattern actually results by cho~singthe instants and phases of reversing the capstan revolution.
The brackets hold the conductor bundle immobile in the capstan, except for the movement forced upon the bundle at the point of engagement with the brackets on account of the translatory and revolving movement of the brackets.
Therefore, upon being released, but while traveling from the point of release to nipple 17~ an additional twist is provided because the bundle upstream is held by a still closed pair of brackets which continues to revolve. One ob-tains, therefore, a double-twist stranding.
The wrapping device 18 provides the stranded stock with a helical winding for preventing the stranded conductors from untwisting. The stranded and wrapped stock can be processed further downstream, for example, by extrud-ing insulation on and around the assembly or by jacketing the assembly other-wise. Particularly, the stranded stock can be used as a core, about which are twisted further strands.
It should be noted that the effective stranding length is a continu-ously variable one. A certain length of the bundle la is twisted in any instant by cooperation of head 4 and a pair of brackets 7. When the two brackets of a pair close about the bundle, they have a particular distance from the nipple 4 and begin to twist the portion of the bundle between brackets and head as a whole, while receding from the nipple on account of the chain movement. The effective stranding length is, therefore, continuously lengthened until the next pair grips the bundle etc. In cases, this variation in effective length may be deemed undesirable.
Figure 2 illustrates how the temporary storage capacity of the strand-ing equipment itself can be increased without interfering with the features out-lined above. The elements 30, 31, 32 and 33, respectively, correspond to parts 1, 2, 3 and 4 in Figure 1, producing a bundle 34 to be stranded downstream from nipple 33. The bundle is gripped by a first revolving capstan 35 constructed and operated like capstan 5 above. Downstream from capstan 35 is provided an-other revolving capstan 36. Another strand nipple 37 is provided downstream from capstan 36~ Stranding is provided between the nipples and the capstans which run in synchronism. Of course, they should also reverse simultaneously.
Reference numeral 38 refers again to a device for wrapping the stranded stock.
This machine, employing two revolving capstans, establishes a vari-able storage capacity for the stock. The capacity can be varied by varying the distance between the two capstans 35, 36. This feature, in turn, permits the selection of the lays number of the stranding in one direction. The capstan 36 does not have to revolve at the same speed as capstan 35. Moreover, the two capstans 35 and 36 may actually revolve in opposite directions.
A specific improvement will now be explained with reference to Figure 3 which improvement is basically applicable to all of the several examples above. Plural strand elements 50 are paid from a stationary supply ~rotating drums); these elements may be of large, e.g., section-shaped cross sections, or each one of the elements 50 may be a conductor composed of stranded filaments, i.e. stranded wire bund-les. Guide sheaves or pulleys 52 run these strand ele-ments to a stranding head 53 defining the first stranding point. Rolls or pul-leys 52 may also be provided here for stretching and/or straightening of the elements 50 prior to entering the first stranding head.
Head 53 combines the stranding elements in a bundle and feeds them to a stranding device 54 placed downstream from this first stranding point. The stranding device 54 is comprised of two-serial, caterpillar-type capstans 55 and 56, any of which is shown in greater detail in Figure 6 and will be de-scribed more fully below. Suffice it to say that each capstan includes bracket elements which grip the bundle 67, hold it for a certain storage path length and release it again.
As described earlier and quite analogously, each of the capstans 55 and 56 revolve on and about the longitudinal stranding axis, either continu-ously, or in alternating directions, e.g., for obtaining S-Z type stranding.
- 12 _ For example, the direction may be changed whenever the bundle has traversed a distance equal to the storage length in the capstans 55 and 56. The twisted bundle as held by the capstans 55 and 56 is not twisted or stranded further while being so held. This path and storage length for the bundle extends spec-ifically from the point where a bracket of capstan 55 grips the arranging bun-dle up to the point where a bracket of capstan 56 releases the bundle. This storage length is denoted Qsp The stranded bundle as released by capstan 56 is fed through a wrap-ping device 57 which wraps a holding and retaining ribbon around the stranded bundle. Moreover`, the device 57 may include an extruder, extruding a suitable synthetic around it and into the gaps between the stranded elements to, there-by, embed the stranded elements into an inner core. The wrapping will occur upstream from the extrusion. In addition, the bundle as so jacketed -may be suitably marked for identification.
A second stranding point, 58, is established downstream from dev-i~e 57. This particular stranding point is also a caterpillar-like capstan, ex-cept that it does not revolve on the stranding axis. Thus, the bundle receives an additional twist in the space between revolving capstan 56 and nonrevolving capstan 58. Neither extruCion nor ribbon wrapping will interfer with the addi-tional stranding.
The stranded stock is redirected by a sheave 60 and wound onto a drum61. This is the simplest operation after the stranding. However, additional working steps may be performed on the stranded stock. For example, an armoring may be provided around the stranded bundle, and an outer jacket may be extruded, this jacket to be made of a wear-resistant material such as PVC.
The point in which a bracket of capstan 58 engages the bundle 59 is spaced from the point in which a bracket or capstan 56 releases the bundle by a distance equal to 2nQr, wherein n is a positive integer and Qr is the dis-tance the bulldle travels in between reversals for stranding in an S-Z pattern.
The storage length Qs in the capstan may be equal to that length Qr. The total distance chosen, as between capstan 56 and the second stranding point, depends upon particulars of the desired stranding. As stated above, the stranding 59 will have zero waviness, or remains very small, for the following reasons.
In the example of Figure 3, it is assumed that the first stranding point is placed rather closely to the capstan 55. Moreover, it is assumed that capstans 55 and 56 revolve in one particular direction for the time it takes a bundle increment to traverse the storage path length Qsp' whereupon the direc-tion of rotation is reversed for a like period. This way, one alternates be-tween S-twists and Z-twists and Qr = Qsp In this specific example, the second stranding point (entrance to capstan 58) is located at a distance from capstan 56 which is equal to twice the reversal length. Thus, in any instance equal quantities of S-twists and Z-twists ~i.e., one each) is located in this second stranding path. Mathem-atically speaking, the total twist on the path from capstan to second stranding point is always zero. The Figure 1 shows an instant in which the device just about reverses from Z-twist to S-twist. Accordingly, the Z-twist portion that now will gradually enter and pass through the second stranding point (58) will be gradually untwisted, but additional S-twist is imparted upon the S-twist portion. That additional S-twist is removed again from the bundle when and after the direction of revolving the capstans 55 and 56 is again reversed to-ward producing a Z-twist. As a consequence, the objectional waviness is, in fact, reduced. It was found moreover that waviness is reduced more for still longer lengths, i.e., spacing between revolving capstan and downstream strand-ing point. However, the spacing must be an even multiple of the distance any bundle increment travels in between reversals.
Figure 4 shows one of the capstans, which may be any of the capstans 5, 35, and 36 bearing in mind, however, that in some instance bracket mounts should be used to compensate differences in speed of the stock along the prop-agation path. On the other hand, the speed of the chain drive motors such as 66 and 66a could be controlled accordingly. This particular capstan is basical-ly comprised of two chains, 64 and 64a respectively looped around pairs of sprockets, 65 and 65a. One sprocket in each instance is driven by a drive, 66 and 66a, respectively. Bracket and jaw elements 62 are mounted to these chains in a particular distance from each other, but in such a way that these jaw and bracket elements face each other for gripping cooperation of the bundle. The bracket elements have detents 70, and elastic pins 68 are inserted in and àf-fixed to the detents of the bracket elements on chain 64. The pins are prefer-ably made of rigid high-density polyethylene.
The elements 62 are fastened to the chains by means of suitable fas-teners-63. These fasteners are centered with respect to pins 68, and vice versa; also, the fasteners on chain 64 are centered to the detents 70 of the respective jaw~nd bracket elements 62 on that chain. Thus, the pins 68 will engage oppositely located detents in gear-like fashion (see center line 71 in one instance). Also, the centers of the pins 68 run along a particular path 69 which merges with the corresponding path 69a of the other chain. Those are the paths of contact of the capstan with the stranded bundle 67 runs in these merging path portions and is positively engaged by the pins 68 and the respec-tive opposing detents 70, matching the pins' contours. Engagement is analogous to holding a chuck and resemble a gear engagement.
The positive engagement of pins and detents of opposing bracket ele-ments ensures automatically uniformity in the movement of both chains; an equal-ization gear, or the like, is not needed. Of course, the two drives should be adjusted toward uniform motion as accurately as possible. This arrangement is particularly advantageous in the case of a revolving capstan (55, 56, 35, 36, 1~51024 etc.) as it permits both chain systems of the capstan to have similar mass.
Also, the armatures of the t~o drives 66 and 66a can be electrically connected in parallel so that the motors can be controlled, e.g., electronically in a very simple fashion.
S The invention is not limited to the embodiments described above; but all changes and modifications thereof, not constituting departures from the spirit and scope of the invention, are intended to be included.
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for stranding elongated stock, comprising:
a plurality of stationarily mounted, reelable support spools storing individual strands to be unwound from the spools upon rotation thereof;
means for combining the strands as unwound in a bundle and for providing a first stranding point through which the bundle passes;
means disposed for positively holding the strands of the bundle as a bundle for a particular travel path as the bundle moves along the travel path together and in engagement with the means for holding, said means for holding revolving about said axis in alternating direction for stranding the strands together about an axis at opposite twist, outside the travel path between the means for positively holding and the first stranding point, stranding does not occur on and along the particular travel path due to said positive holding;
reversible drive means and control means for the reversible drive means for driving said means for holding;
means defining a second stranding point through which the stranded bundle passes by operation of rotation as between the means for positively holding and the second stranding point being spaced from the means for holding by a distance being an even-numbered multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the first and second stranding points, the means for holding engaging the bundle as so moved through the travel path without stranding a portion of the bundle while on the travel path due to the positive holding.
a plurality of stationarily mounted, reelable support spools storing individual strands to be unwound from the spools upon rotation thereof;
means for combining the strands as unwound in a bundle and for providing a first stranding point through which the bundle passes;
means disposed for positively holding the strands of the bundle as a bundle for a particular travel path as the bundle moves along the travel path together and in engagement with the means for holding, said means for holding revolving about said axis in alternating direction for stranding the strands together about an axis at opposite twist, outside the travel path between the means for positively holding and the first stranding point, stranding does not occur on and along the particular travel path due to said positive holding;
reversible drive means and control means for the reversible drive means for driving said means for holding;
means defining a second stranding point through which the stranded bundle passes by operation of rotation as between the means for positively holding and the second stranding point being spaced from the means for holding by a distance being an even-numbered multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the first and second stranding points, the means for holding engaging the bundle as so moved through the travel path without stranding a portion of the bundle while on the travel path due to the positive holding.
2. An apparatus as in Claim 1, the means for holding including pairs of clamping brackets holding the bundle from opposite sides.
3 An apparatus as in Claim 2, the brackets being mounted on two endless, belt-like carriers.
4. An apparatus as in Claim 1, said means for holding including a pair of caterpillar-like elements with clamping brackets establishing a capstan for holding said bundle over said travel path;
a frame for said capstan journalled for rotation on said axis; and means for driving said frame.
a frame for said capstan journalled for rotation on said axis; and means for driving said frame.
5. An apparatus as in Claim 4, said second stranding point being established by a second capstan.
6. An apparatus as in Claim 5, and including a fur-ther capstan between said means for combining and said rotat-ing capstan.
7. An apparatus for stranding elongated stock, comprising:
a plurality of spools, storing individual strands to be unwound from the spools;
means for combining the strands, as unwound from the spools, in a bundle and providing a first, relatively nonrotating stranding point;
capstan means, including plural clamping bracket means, each engaging the bundle positively and moving with the bundle for a particular travel path before disengaging from the moving bundle;
means defining a second nonrotating stranding point, said capstan means being disposed between the first and second stranding point, the second stranding point being spaced from the capstan means by a particular distance;
reversible drive means for causing the capstan means to rotate to obtain stranding of the bundle as between the first stranding point and a point of engagement of the bundle with one of the clamping means, and to obtain addi-tional stranding as between a point of engagement of the bundle with another one of the clamping means, just prior to release of the bundle by the latter clamping means and the second stranding point, there being no stranding of a portion of the bundle as between the one clamping means and the other clamping means on account of said positive engaging of the bundle;
control means for reversing said drive means, said particular distance being an even number multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the strand-ing points and the travel path as the bracket means engage the moving bundle.
a plurality of spools, storing individual strands to be unwound from the spools;
means for combining the strands, as unwound from the spools, in a bundle and providing a first, relatively nonrotating stranding point;
capstan means, including plural clamping bracket means, each engaging the bundle positively and moving with the bundle for a particular travel path before disengaging from the moving bundle;
means defining a second nonrotating stranding point, said capstan means being disposed between the first and second stranding point, the second stranding point being spaced from the capstan means by a particular distance;
reversible drive means for causing the capstan means to rotate to obtain stranding of the bundle as between the first stranding point and a point of engagement of the bundle with one of the clamping means, and to obtain addi-tional stranding as between a point of engagement of the bundle with another one of the clamping means, just prior to release of the bundle by the latter clamping means and the second stranding point, there being no stranding of a portion of the bundle as between the one clamping means and the other clamping means on account of said positive engaging of the bundle;
control means for reversing said drive means, said particular distance being an even number multiple of the travel path of the bundle in between reversals by the control means; and means for moving the bundle through the strand-ing points and the travel path as the bracket means engage the moving bundle.
8. An apparatus as in Claim 7, said capstan means including two capstans arranged in series, each defining a portion of the travel path.
9. An apparatus as in Claim 8, said capstans rotat-ing in opposite directions to obtain additional stranding of the bundle extending between them.
10. An apparatus as in Claim 1 or 7, including means for wrapping around a ribbon, disposed upstream from the second stranding point.
11. An apparatus as in Claims 2 or 7, said bracket means being mounted on the two juxtaposed, endlessly driven chains, each of the clamping bracket means including a pair of clamping brackets, one bracket per chain, for gripping the bundle.
12. An apparatus as in Claim 11, wherein one of the brackets of a pair has a detent, the other one a matching pin for holding the bundle against the detent.
13. An apparatus as in Claim 1 or 7, including means for extruding a filler jacket around and into the stranded bundle, and being disposed upstream from the second stranding point.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792942924 DE2942924A1 (en) | 1979-10-24 | 1979-10-24 | METHOD AND DEVICE FOR CONTINUOUS WIREING OF CORES OF LARGER CROSS SECTIONS FOR ELECTRICAL CABLES |
| DEP2942924.1 | 1979-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151024A true CA1151024A (en) | 1983-08-02 |
Family
ID=6084241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363057A Expired CA1151024A (en) | 1979-10-24 | 1980-10-23 | Forming stranded stock |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5667114A (en) |
| BE (1) | BE885847R (en) |
| CA (1) | CA1151024A (en) |
| CH (1) | CH649168A5 (en) |
| DE (1) | DE2942924A1 (en) |
| SU (1) | SU1088675A3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113198091A (en) * | 2021-04-15 | 2021-08-03 | 上海中医药大学附属龙华医院 | Medicated thread manufacturing system and medicated thread manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112951516B (en) * | 2021-03-17 | 2023-11-21 | 成都大唐线缆有限公司 | Data cable set serial production equipment |
-
1979
- 1979-10-24 DE DE19792942924 patent/DE2942924A1/en active Granted
-
1980
- 1980-06-03 CH CH428280A patent/CH649168A5/en not_active IP Right Cessation
- 1980-06-24 SU SU802937816A patent/SU1088675A3/en active
- 1980-10-23 JP JP14767380A patent/JPS5667114A/en active Pending
- 1980-10-23 CA CA000363057A patent/CA1151024A/en not_active Expired
- 1980-10-23 BE BE0/202573A patent/BE885847R/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113198091A (en) * | 2021-04-15 | 2021-08-03 | 上海中医药大学附属龙华医院 | Medicated thread manufacturing system and medicated thread manufacturing method |
| CN113198091B (en) * | 2021-04-15 | 2022-11-22 | 上海中医药大学附属龙华医院 | Medicated thread manufacturing system and medicated thread manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| BE885847R (en) | 1981-04-23 |
| JPS5667114A (en) | 1981-06-06 |
| DE2942924C2 (en) | 1987-05-21 |
| CH649168A5 (en) | 1985-04-30 |
| DE2942924A1 (en) | 1981-05-07 |
| SU1088675A3 (en) | 1984-04-23 |
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