CA1126711A - Stranding machine provided with central bobbins - Google Patents
Stranding machine provided with central bobbinsInfo
- Publication number
- CA1126711A CA1126711A CA366,612A CA366612A CA1126711A CA 1126711 A CA1126711 A CA 1126711A CA 366612 A CA366612 A CA 366612A CA 1126711 A CA1126711 A CA 1126711A
- Authority
- CA
- Canada
- Prior art keywords
- wire
- bobbin
- disc
- set forth
- stranding machine
- 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
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
- D07B3/02—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the supply reels rotate about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the component strands away from the supply reels in fixed position
- D07B3/04—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the supply reels rotate about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the component strands away from the supply reels in fixed position and are arranged in tandem along the axis of the machine, e.g. tubular or high-speed type stranding machine
- D07B3/045—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the supply reels rotate about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the component strands away from the supply reels in fixed position and are arranged in tandem along the axis of the machine, e.g. tubular or high-speed type stranding machine with the reels axially aligned, their common axis coinciding with the axis of the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/02—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package
- B65H59/04—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating delivery of material from supply package by devices acting on package or support
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/02—Machine details; Auxiliary devices
- D07B7/06—Bearing supports or brakes for supply bobbins or reels
Abstract
ABSTRACT OF THE DISCLOSURE
A stranding machine comprising a plurality of units each of which comprises a pair of spaced wire bobbins rotatably mounted on a hollow shaft and a pair of spaced discs rotatably mounted on the shaft intermediate the bobbins. One bobbin can be loaded with wire while wire from the other bobbin is supplied to a stranding station through the hollow shaft. Each bobbin rotates during stranding and is braked by a braking device for wire tensioning purposes and to stop relative rotation of bobbins and the adjacent discs when the machine stops.
The brake can be released after the machine is stopped to permit a bobbin to rotate while it is being loaded with wire.
A stranding machine comprising a plurality of units each of which comprises a pair of spaced wire bobbins rotatably mounted on a hollow shaft and a pair of spaced discs rotatably mounted on the shaft intermediate the bobbins. One bobbin can be loaded with wire while wire from the other bobbin is supplied to a stranding station through the hollow shaft. Each bobbin rotates during stranding and is braked by a braking device for wire tensioning purposes and to stop relative rotation of bobbins and the adjacent discs when the machine stops.
The brake can be released after the machine is stopped to permit a bobbin to rotate while it is being loaded with wire.
Description
STRANDING ~CHTNE PROVIDED WITH CENTRAL soBBINs The present invention relates to a stranding machine which comprises a plurality of bobbins assembled in idle relation on the machine shaft, which bobbins are used both to strand and to wind up new wire.
~ achines of this type are employed to strand several wires together or to strand several wires about a central core, as for instance a rope, the conductor of an electric cable, or a similar element of considerable length progressively moved in the direction of its axis.
In general, the machines comprise a plurality of hollow shafts aligned with one another, each of which is-free to rotate about a support and is driven into rotation by appropriate motor means, at least one pair of bobbins assembled on the shaft in idle relation but permanently fixed to it, a paying-off element or arm for decoiling the wire from a bobbin, and appropriate driving pulleys.
In these machines, during the stranding operation, the wires of one of the bobbins of all the pairs assembled on each shaft in idle relation thereto are progressively paid off from the related adjacent decolling element which in said phase is fast with the rotating shaft and, by means of a system of pulleys, the wires are guided through the plurality of hollow shafts towards the stranding station, the necessary tension being exerted by appropriate tensioning means.
On their turn, the second bobbins of the various pairs, adjacent on the same shaft to the stranding bobbins, are driven into rotation to be loaded with coils of new wire which will be subsequently used for the stranding phase when the first adjacent bobbins are exhausted.
~67~
In machines of this kind, it is necessary to impart to the wire a correct paying-off tension and to provide convenient tension regulation systems; also, i~ is important to carry out, when the machine stops, a relevant braking action, stronger than that exerted in the paying-off phase, so as to stop the bobbin at the same moment at which the machine is stopped.
In fact, when the sense of rotation - in the paying-off phase - is concordant with that of the arm, so that the latter is always pulling the bobbin into rotation, the absolute speed of the bobbin is equal to the arm speed, for instance of the ;~
order of 600-700 r.p.m., plus the paying-off speed, for instance of the order of 50 r.p.m.
On the contrary, when the sense of rotation - in the paying-off phase - is opposite to that of the arm, the absolute speed of the bobbin is equal to the arm speed minus the paying-off speed, but is still very high.
Therefore, in the above described machines it is necessary to provide a system which - besides~putting the wire under `~
tension - must supply to the bobbin, when the machine stops, a strong braking force, because the rotation of the bobbin in-volves, besides the paying-off speed, also the speed caused by pulling which is ten or more times higher than the paying-off speed.
The provision of a satisfactory solution is complicated by the need of further complying not only with the working con-ditions of the machine to obtain a good stranding, but also with those caused by a stopping due to any reason, this must be ensured by means which are able to allow an automatic passage ~`
from the light tension action exerted on the wire to be payed-off to the strong braking action necessary to stop the bobbin, and a further feature must be the possibility of a quick release
~ achines of this type are employed to strand several wires together or to strand several wires about a central core, as for instance a rope, the conductor of an electric cable, or a similar element of considerable length progressively moved in the direction of its axis.
In general, the machines comprise a plurality of hollow shafts aligned with one another, each of which is-free to rotate about a support and is driven into rotation by appropriate motor means, at least one pair of bobbins assembled on the shaft in idle relation but permanently fixed to it, a paying-off element or arm for decoiling the wire from a bobbin, and appropriate driving pulleys.
In these machines, during the stranding operation, the wires of one of the bobbins of all the pairs assembled on each shaft in idle relation thereto are progressively paid off from the related adjacent decolling element which in said phase is fast with the rotating shaft and, by means of a system of pulleys, the wires are guided through the plurality of hollow shafts towards the stranding station, the necessary tension being exerted by appropriate tensioning means.
On their turn, the second bobbins of the various pairs, adjacent on the same shaft to the stranding bobbins, are driven into rotation to be loaded with coils of new wire which will be subsequently used for the stranding phase when the first adjacent bobbins are exhausted.
~67~
In machines of this kind, it is necessary to impart to the wire a correct paying-off tension and to provide convenient tension regulation systems; also, i~ is important to carry out, when the machine stops, a relevant braking action, stronger than that exerted in the paying-off phase, so as to stop the bobbin at the same moment at which the machine is stopped.
In fact, when the sense of rotation - in the paying-off phase - is concordant with that of the arm, so that the latter is always pulling the bobbin into rotation, the absolute speed of the bobbin is equal to the arm speed, for instance of the ;~
order of 600-700 r.p.m., plus the paying-off speed, for instance of the order of 50 r.p.m.
On the contrary, when the sense of rotation - in the paying-off phase - is opposite to that of the arm, the absolute speed of the bobbin is equal to the arm speed minus the paying-off speed, but is still very high.
Therefore, in the above described machines it is necessary to provide a system which - besides~putting the wire under `~
tension - must supply to the bobbin, when the machine stops, a strong braking force, because the rotation of the bobbin in-volves, besides the paying-off speed, also the speed caused by pulling which is ten or more times higher than the paying-off speed.
The provision of a satisfactory solution is complicated by the need of further complying not only with the working con-ditions of the machine to obtain a good stranding, but also with those caused by a stopping due to any reason, this must be ensured by means which are able to allow an automatic passage ~`
from the light tension action exerted on the wire to be payed-off to the strong braking action necessary to stop the bobbin, and a further feature must be the possibility of a quick release
-2-of the bobbin to enable it to pass from the stranding phase tothe reloading phase.
Further, the provided solution must be suitable for a simple and economical application to a plurality of bobbins, which sometimes is considerable, comprising, for instance, 18 pairs of bobbins or even more.
It is moreover to be noted that in the above indicated machines, the involved speeds lead to the facing of the problems originated by the high centrifuga~forces which could compromise or handicap the means envisioned to put the wire under tension and to brake the bobbins.
The Applicant considers that the improvements to be made to the above indicated stranding machines must ensure the three following characteristics: an immediate braking of the bobbins when the machine stops, a tension of the wire being stranded which can be automatically applied to all the bobbins mounted on the shaft in a central position and a quick release of the bobbins for their subsequent reloading.
The present invention aims at providing a stranding machine provided with central bobbins which is able to solve all of the above mentioned oroblems, ensuring, therefore, an im-proved performance.
Accordingly, the object of the present application is a stranding machine for several wires, which comprises a plurality of pairs of bobbins, used both to strand and to wind up new wire and assembled in idle relation on at least a hollow shaft free to rotate about a support, a pair of discs idle Oll said shaft and h~ving an axially inner position with-respect to a pair of bobbins, each of said discs being made fast with the shaft when the adjacent bobbin is in the stranding phase and.which com-prises a paying-off element or decoiling arm with a respective .
pulley intended to guide - in combination with a group of pulleys - the wire payed-off from the bobbin towards the inside of the hollow shaft where it is subjected to tension and is dragged inside said shaft towards the stranding station, the machine being characterized in that it comprises connection means between the bobbin and the disc which originate in the stranding phase a controlled relative movement between the bobbin and the disc and secure the -former to the latter when the machine stops, and means to disengage the bobbin from the disc to prepare it for the subsequent phase of reloading with new wire and during said phase. In a preferred embodiment, said connection means comprises a band brake wrapped at a pre-established angle around the periphery of a suitable brake drum for the bobbin, the band ends being respectively connected to a point on the disc and to a first spring having pre-established characteristics and applied to the disc in such a way as to transmit to the band a braking orce able to stop the bobbin loaded with the wire, rotating at its rated speed, at the same time at which the machine stops, a unit for adjusting the tension of the wire to be payed-off formed by a system of levers swinging about a pin on the disc in accordance with the wire ~;
tension and acting on a pulley associated with a first side of the lever and with the contrasting action of a second spring of pre-established characteristics, applied to the disc with one end on the second side of the lever, and hy an element able to transmit a tension of the wire, which is higher than the con-trast force of said second s~ring from the lever system to the band brake, to vary the braking action of the band on the ~
bobbin drum and to maintain at a constant value the tension of ~ .
the wire being payed-off. According to a particular solution, the means for releasing the bobbin from the disc when the . ,~
7~
machine is stopped comprises a device permanently associated with the disc and provided with an element exerting a tension action on one of the two ends of the first sprin~ during the stranding phase and ahle to nullify the camber o~ said first spring when the machine is stopped.
From the above, it can be noted that according to the ~referred solutions, the main features of the invention consist in a band connection between the bobbin and the disc, a device for adjusting the tension action in the stranding operation, and a releasing device for the immediate passage of the bobbin from the stranding phase to its-reloading with new wire.
The band connection, associated with the tension adjusting system, produces a wire tension of constant value in the relative movement between the bobbin and the disc; in par~
ticular, owing to the above described characteristics, during the transitory step preceding the machine stopping, the action exerted by the element transmitting the wire tension on the band brake is progressively reduced, thus giving rise to a progressively increased braking action of the first spring, until the elimination of the relative movement between the disc and the bobbin.
The releasing device completes the above cited band connection since in the stranding phase it has the task of loading the first spring; when the machine stops, the relative approach of the ends of said first spring permits the disengage-ment between the disc and the bobbin. ~;~
According to a preferred embodiment, particularlyintended to reduce the effect of the centrifugal force on the wire tension adiusting system, the machine is characterized in that in the lever system, the lever pin and the axis of rotation of the pulleys on the lever are in a position radial ~.~Zt;~
to the axis of rotation of the machine.According to a further embodiment, the st~anding machine is characterized in that the wire to be payed-off, before passing on the swinging pulley of said lever system, travels on a return roller arranged parallel to the bobbin axis and im-mediately outside the bobbin flange.
The present invention will now be better understood from the following detailed description, given by way of non-limiting example and made with reference to the figures of the attached sheets of drawings, in which:
Fig. 1 is a longitudinal view of the machine which, for simplicity's sake, comprises only two pairs of bobbins;
Fig. 2 is a front view of the disc adjacent to a central bobbin and shows the wire tension adjusting means, the bobbin braking means and the bobbin release device;
Fig. 3 illustrates a detail of the wire tension adjusting system in a longitudinal partial view of the machine, but not showing the band brake;
Fig. 4 is a partial perspective view of the machine showing the travel of the wire through the pulleys as far as the inside of the machine shaft; and Fig. 5 illustrates a detail of the bobbin releasing device.
The invention is applicable to machines for manufacturing one-layer strands or several layer strands having alternate senses and/or different pitches.
The following description concerns one of the possible embodiments of the invention; for instance, it concerns a machine 1 (Fig. 1) used to strand several wires 2 about a ~ , ...
t~
central core or, still by way of example, to form a screening about the central part 3, formed by the conductor and relative insulation, of a power cable.
The machine comprises several units 4, equal in number to the number of wires to be stranded. Each unit comprises a hollow shaft 5 (Figs. 1;3) free to rotate about a central support 6, a pair of bobbins 7,8 assembled in idle relation on the shaft 5 at the sides of the support 6 and used simultaneously both to strand and to wind up the wire, their function being inverted in successive steps, a pair of discs 9,10 mounted to idle on the shaft 5 at the sides of the support 6 in an axially inner position with respect to the bobbin, a paying-off element or decoiling arm 11 carried by each disc with a related pulley 12 and intended to pay-off wire from the bobbin and to guide it - by means of a further pulley 13 mounted on the revolving shaft 5 - inside the latter, a single dispenser 14 (Fig. 1) of the wire to be alternatively wound up on either bobbin of the pair of bobbins 7,8, and a system for transmitting motion to the bobbins in the winding-up phase.
The units 4 of machine 1 - iIlustrated in number of two for simplicity's sake - have their respective shafts 5 aligned and separated so as to allow an advantageous connection between the end of the wire payed-off from bobbin 8 in the stranding phase and the end of the adjacent bobbin 7' of other units 4, loaded by dispenser 14 during the stranding phase of bobbin 8.
An appropriate auxiliary shaft 15, by means OL gears or other equivalent driving means provided on supports 6, rotates the shafts 5 and the discs associated with them ~ith suitable means in the stranding phase of the respective adjacent bobbins.
All the units 4 (Fig. 1) are situated between a core paying-off stand 16 and a final station 17 which comprises a P~l~
perforated plate 18, for the passage of the wires 2 through suitable holes, which plate 18 rotates integrally with the shaft of the last unit, a die 19 secured to a base 20 and con-ventional tensioning and collection means (not illustrated).
Therefore, the wires 2 and the core 3 are guided inside the plurality of shafts 5 and are subjected to the tension imparted by the tensioning means.
Of course, when the machine is used to manufacture multi-layer strands, for instance, two-layer strands, the machine units are divided into two successive groups, one for each layer, each group having units whose rotation senses and speeds are egual to or different from, those of the units of the other group, depending on whether the layers have alternate laying senses or not, each group being moreover provided with the relative plate 18 for the passage of the wires and with the thereto associated die 19.
The dispenser 14 of the wire to be alternatively wound up on either bobbin of one same pair and the system for im-parting motion to the bobbins in the winding up phase can be identical to those described in the Canadian Application No.
363,576 of the same applicant filed on October 30, 1980.
In particular, mention is made of the fact that dis-penser 14 comprises an arm 21 which is rotatable through an angle of 180 from one bobbin to the other and which can be moved in a direction parallel to the machine axis with a stroke corresponding to the distance between the flanges of the bobbin and an end pulley 22, able to guide the wire coming from a i`
feeding drum on the machine bobbin, which moves together with arm 21.
The actuation system of the bobbins in the winding-up phase can comprise a central shaft, positioned between the discs and driven by a motor independent of the main shaft 15,and two ~ , , 7h~
lateral shafts, assembled on the discs in idle position and connected to gears of the bobbins. This embodiment foresees specific claw clutches between the lateral shafts and the central shaft, which are ex~lained in detail in the above cited application of the applicant and are not described herein for brevity in the present specification.
Some main characteristics of the invention illustrated in detail in Fig. 2 will now be explained more particularly.
More precisely, such characteristics relate to the c~nnection means between the bobbin and the disc which are able to produce, in the stranding phase, a controlled relative movement to obtain a correct tension of the wire, and to secure the bobbin to the disc when the machine stops, as well as to the means able to disengage the bobbin from the disc to prepare it for reloading with new wire and during the latter step.
These means, the same for each unit of the machine, are described with reference to bobbin 8 and to disc 10 of Fig. 1.
The connection means comprises (Fig. 2) a band brake 23 acting on bobbin 8, a lever system 24 sensitive to the variations of tension of t~e wire payed-off from bobbin 8, an element 25 arranged between the lever system 24 and the band 23 for trans-mitting a change in the tension of the wire being payed-of which is higher than a pre-established value, saia element being able to vary the braking of the band on the bobbin, adjusting, therefore, to a practically constant value the tension of said wire payed-off.
The band 23 is wrapped - at a pre-established angle -around the periphery of an appropriate brake drum 26 secured to the bobbin, one end 27 of the band being connected to a fixed point on disc 10 and the other end 28 being subjected to the action of a first spring 29 having such characteristics and _9_ ~' . . .
., ~Z~i'71~
ap~lled to the disc in such a manner as to transit to the band a braking force able to stop the bobbin, loaded with the wire and rotating at the rated speed, at the same moment at which the machine is stopped.
Preferably, the band brake 23 comprises a plate 30 rotatable about a pin 31 parallel to the disc 10 axis and mounted on the disc. The plate 30 is attached to, respectively applied on opposite parts with respect to the pin 31, a first end 32 of the first spring 29, the second end 33 of which is secured and stretched on a part 34 fast with the disc 10, and an end 35 of the element 25 which transmits the variation of the wire tension between the lever system 24 and the band 23.
The plate 30 carries moreover the end 28 of band 23, the connection being made at the same side - with respect to the pin 31 - on which is applied the first spring 29.
By means of the above indicated arrangement, the first spring 29, subjected to tension by the action exerted on end 33 secured to the disc, originates with respect to pin 31 a rota~ -tion of plate 30, the sense of rotation - as shown in Fig. 2 -being such as to wrap closely the band 23 around the brake drum and to impart to it the maximum braking force.
The release of this braking action depends on the action exerted on plate 30 by element 25 in accordance with the oscil-lations of system 24 providing the wire tension adjustment, which will now be explained in detail.
Substantially, said lever system 24 is based on the use of a lever, having a rotation pin on an appropriate support fast with the disc, and with sides respectively subjected to the action of the wire and to that of an opposing spring 43.
The spring 43 has pre-established characteristics, in the sense that it ensures an unvaried position of the lever as : ::
~Z~i7~L
lor.g as the wire does not exceed a pre-established tension; in the contrary case, the oscillation of the lever act~ on the transmission element 25 and the bobbin is released to bring again the wire tension to a practically constant value.
Several typical solutions in respect of the wire tension adjusting system can be provided iII accordance with the above indicated principle. The preferred one will be described here-below.
Said solution comprises a lever 36 whose mounting pin 37 is associated with a support 38 (see Figs. 3,4) extending in a direction substantially parallel to the bobbin axis. The side 39 of the lever bears a pulley 41 having an axis of rotation 42, whilst the side 40 is, instead, subjected to the action of a second spring 43 having the already cited function and shown in Fig. 2. The pin 37 of the lever is directed radially to the bobbin axis (see Figs. 3,4) so that the lever can swing along planes orthogonal to said direction, with the advantageous result not to be subjected to the influence of the centrifugal forces involved, which might otherwise compromise the whole adjusting system.
The second spring 43 has one end 44 applied to a fixed point on the disc 10 and the other end ~5 fixed to a further lever 46 (Figs. 2,3) which has a pin 47 in orthogonal position to the disc and associated thereto and a side 48 associated at 48' to lever 36 by means of connections (not shown) comprising a pin slidable in accordance with the oscillations of the system provided at the fork end of side 40 of lever 36.
The end ~14 of the spring can be situated on the disc in different positions in order to vary the load of the same springs.
Regulation means of conventional type (not illustrated) are pro-vided for this purpose.~
~Ztit71~
The second lever 46 is attached moreover (Fig. 2), and associated with it, to the end 49 of the transmission element 25 between the lever system 24 and the band brake 23.
In one embodiment, said element 25 is flexible and transmits only tension forces. For instance, it is a metallic rope or a nylon string whose end 49 is connected to the lever 46, at the opposite side of spring 43 with respect to the position of pin 47.
The use of a metallic rope instead of a rigid element represents a further advantage of the invention. In fact, being flexible, the rope can be curved by passing, for instance, over a pulley 25' associated to the disc (Figs. 2,5), permitting an easy arrangement of both springs inside the space defined by the rope itself. Effectively, in this case, the two springs can be situated very near to the centre of rotation of the disc 10, reducing therefore the influence of the centrifugal force and, ultimately, affording the advantage of a correct braking of the bobbin.
Still with reference to the preferred embodiment con-cerning the lever system 24, description will now be made ofthe travel of the wire payed-off from the bobbin, before and~
after its passage about the pulley 41 swinging about pin 37.
The wire 2 outcoming from the bobbin 8 is at first directad on the return roller 50 (Fig. 4), which is mounted to idle on shaEt 11 :in a direction parallel to the bobbin axis and immeaiately outside flange 51. Then, it passes around pulley 41 of lever 36, and then it is directed around pulley 52 which idles on shaft 11, in a way independent from roller 50.
Subse~uently, it is deviated towards pulley 13 mounted on the shaft 5 and then passes inside the shaft 5 towards the stranding station.
According to the above cited preferred solution, the wire 2, instead of passing at first on a pulley integral with a paying-off arm and then on a pulley secured to the shaft 5, namely instead of following a practically rectilinear travel, the wire 2 travels along a multi-directional line, namely is substantially deviated several times, hence, with a reduction of the maximum radius of the rotating parts of the machine owing to the presence of the return roller 50, on which the wire passes directed to pulley 41, and with the consequent possi-bility of increasing the machine speed because - the radial dimensions being reduced - the problems regarding balance and structure are less, so that a lesser power absorption due to aerodynamic resistance is achieved.
The further main characteristic of the machine, regarding the means for releasing the bobbin from the disc to prepare it to be reloaded with new wire and during said phase, will now be explained.
Said means (Figs. 2,5) comprise a device 53 permanently secured to disc 10 and moved into rotation with the latter even during the stranding phase.
The device 53 acts on one of the two ends of the first spring of the band brake 23 and is based on the principle of stretching said spring during the stranding phase and of allowing an approach of the spring ends and therefore a reduction of the relative camber, with release of the bra~e when the machine stops.
As indicated in the figures, the device 53 acts on the second end 33 of spring 29 and comprises a peg 54 and a seat 55 on the disc 10, intended to receive the end of the peg pushed by a small spring 56.
On its turn, said peg 54 can be situated at the end of a -~13-7~
lever 57 having a rotation pin 58 on the disc lO, an end 33 of spring 29 being applied to said lever 57 in a position opposite to the peg 54. The device further comprises a handle 58' to rotate the lever 57 in the clockwise direction with reference to Fig. 2, thus releasing spring 29 and opening the band brake 23.
After the description of the main features of the in-vention, it will be easy to understand the relative working operations herebelow indicated, starting from the arrangement of Fig. 1, in which the bobbin 7,7' and 8,8' of the units of machine 1 work in the winding phase and in the stranding phase, respectively.
During the reloading with new wire, the disc 9 of bobbin 7 is secured, for instance, by a pin, to the central support 6 with an appropriate orientation which is just selected to move the paying-off arm ll downward and to avoid any interference with the wire guiding system 14.
The bobbin 7 is rotated by the motor purposely included for re-winding the wire coming from a feeding drum and/or reel, an adjusting action on the coils to be formed being exerted by dispenser 14 which moves in one sense or in the opposite sense the moving arm 21 and the pulley 22 at a speed correlated, by a pre-established rate, to the revolutions of bobbin 7.
The winding up of new wire on bobbin 7' is carried out in an analogous manner.
During the stranding phase, disc lO of bobbin 8 is connected, for instance, by a pin, to an appropriate flange, not shown, of shaft 5, which is rotated by the~auxiliary shaft 15, and the transmission motion for reloading the bobbln with new wire is interrupted.
The bobbin 8 is rotated about shaft 5 in consequence -of the tension exerted on the wire 2 by the tensioning means, 71~
and said wire ~ is guided in its passage from the outside to the inside of shaft 5 at first through its contact with the periphery of the return roller 50 (Fig. 4), then on pulley 41 of the adjusting lever 36, then on pulley 52 at the end of roller 50 and finally on pulley 13, the mounting of which rotates with shaft 5.
Simultaneously with wire 2, the cable core 3 passes inside shaft 5. Also, said core 3 is subjected to the tension exerted by the tensioning means and is directed from the paying-off stand 16, through the hollow shafts of all units 4 of the machine, towards the stranding station 18-19.
Still in this phase~the tension of wire 2 passing over pulley 41 on the swinging lever 36 is balanced by the reaction force of the spring 43 (Fig. 2). The tension resulting from ; said balance, through the metallic rope 25, exerts a reducing action on the braking of band 23 exerted by spring 29, the band 23 being around the brake drum of the bobbin.
When the machine stops for any reason, disc 10 is braked separately by a suitable brake, for instance pneumatically actuated~ and bobbin 8 tends still to rotate relative to the disc.
Consequently, a slackening of the wire takes place, so that the action exerted by the wire on the band brake 23 through the pulley 41 and the swinging lever 36 and intended to reduce the braking action is eliminated. Therefore, the brake, no longer subjected to the tension exerted on the metallic rope 25, may apply its maximum braking force, giving rise to a closer coupling between disc 10 and bobbin 8 until their relative movement is stopped.
The operation of bobbin 8' in the stranding phase takes place analogously to what is indicated for bobbin 8.
~ '~
In the intermediate steps, the inversion in the function of the bobbins of a same unit occurs as follows:
- when the machine is stopped, the bobbin 7 is disengaged from the motor intended to reload new wire and disc 9 is coupled to a suitable flange of shaft 5;
- then the end of the wire on bobbin 7 is connected to the end of the wire on the bobbin which is already empty and which is carried by the adjacent unit nearest the stranding station 19.
An analogous system is used to prepare for the stranding phase the bobbins reloaded with wire in the preceding phase in all the units of the machine.
Then the bobbin 8, already empty, is prepared to its subsequent reloading with new wire.
This is carried out by acting on handle 58l (Figs. 2,5) of device 53, thus causing the disconnection of peg 54 from its seat 55 on disc 10 (Fig. 5) and the consequent release of spring 29, which results in the release of the bobbin.
Then - with bobbin 8 free to rotate - the following operations are carried out:
- at first disc 10 is angularly moved in such a way that the paying-off arm 11 does not interfere with the position to be taken by dispenser 14 with its wire~
guiding arm 21; ~;~
- th~e moving arm 21 is then rotated through 180 until pulley X2 is aligned with bobbin 8;
- the disc 10 is secured to the support and the wire reloading motor is mechanically connected to bobbin 8;
- at last the wire coming from the feeding drum or resl is guided around pulley 22 and hence around bobbin 8 and the reloading of bobbin 8 is started.
~ .
~26~
In particular, the invention has the advantage that the bobbin braking elements, namely the two springs and the brake band, are arranged in a position extremely near to the disc, ::
without an excessive deviation in axial direction, so that they, together with the other parts of the machine, contribute to the arrangement of many pairs of bobbins in a relatively reduced area.
Although the present invention ha~ been described and illustrated with reference to a preferred embodiment, it is : -understood that its.scope includes any other possible embodiment deriving from the above indicated inventive principle.
-17- :~
.A.
Further, the provided solution must be suitable for a simple and economical application to a plurality of bobbins, which sometimes is considerable, comprising, for instance, 18 pairs of bobbins or even more.
It is moreover to be noted that in the above indicated machines, the involved speeds lead to the facing of the problems originated by the high centrifuga~forces which could compromise or handicap the means envisioned to put the wire under tension and to brake the bobbins.
The Applicant considers that the improvements to be made to the above indicated stranding machines must ensure the three following characteristics: an immediate braking of the bobbins when the machine stops, a tension of the wire being stranded which can be automatically applied to all the bobbins mounted on the shaft in a central position and a quick release of the bobbins for their subsequent reloading.
The present invention aims at providing a stranding machine provided with central bobbins which is able to solve all of the above mentioned oroblems, ensuring, therefore, an im-proved performance.
Accordingly, the object of the present application is a stranding machine for several wires, which comprises a plurality of pairs of bobbins, used both to strand and to wind up new wire and assembled in idle relation on at least a hollow shaft free to rotate about a support, a pair of discs idle Oll said shaft and h~ving an axially inner position with-respect to a pair of bobbins, each of said discs being made fast with the shaft when the adjacent bobbin is in the stranding phase and.which com-prises a paying-off element or decoiling arm with a respective .
pulley intended to guide - in combination with a group of pulleys - the wire payed-off from the bobbin towards the inside of the hollow shaft where it is subjected to tension and is dragged inside said shaft towards the stranding station, the machine being characterized in that it comprises connection means between the bobbin and the disc which originate in the stranding phase a controlled relative movement between the bobbin and the disc and secure the -former to the latter when the machine stops, and means to disengage the bobbin from the disc to prepare it for the subsequent phase of reloading with new wire and during said phase. In a preferred embodiment, said connection means comprises a band brake wrapped at a pre-established angle around the periphery of a suitable brake drum for the bobbin, the band ends being respectively connected to a point on the disc and to a first spring having pre-established characteristics and applied to the disc in such a way as to transmit to the band a braking orce able to stop the bobbin loaded with the wire, rotating at its rated speed, at the same time at which the machine stops, a unit for adjusting the tension of the wire to be payed-off formed by a system of levers swinging about a pin on the disc in accordance with the wire ~;
tension and acting on a pulley associated with a first side of the lever and with the contrasting action of a second spring of pre-established characteristics, applied to the disc with one end on the second side of the lever, and hy an element able to transmit a tension of the wire, which is higher than the con-trast force of said second s~ring from the lever system to the band brake, to vary the braking action of the band on the ~
bobbin drum and to maintain at a constant value the tension of ~ .
the wire being payed-off. According to a particular solution, the means for releasing the bobbin from the disc when the . ,~
7~
machine is stopped comprises a device permanently associated with the disc and provided with an element exerting a tension action on one of the two ends of the first sprin~ during the stranding phase and ahle to nullify the camber o~ said first spring when the machine is stopped.
From the above, it can be noted that according to the ~referred solutions, the main features of the invention consist in a band connection between the bobbin and the disc, a device for adjusting the tension action in the stranding operation, and a releasing device for the immediate passage of the bobbin from the stranding phase to its-reloading with new wire.
The band connection, associated with the tension adjusting system, produces a wire tension of constant value in the relative movement between the bobbin and the disc; in par~
ticular, owing to the above described characteristics, during the transitory step preceding the machine stopping, the action exerted by the element transmitting the wire tension on the band brake is progressively reduced, thus giving rise to a progressively increased braking action of the first spring, until the elimination of the relative movement between the disc and the bobbin.
The releasing device completes the above cited band connection since in the stranding phase it has the task of loading the first spring; when the machine stops, the relative approach of the ends of said first spring permits the disengage-ment between the disc and the bobbin. ~;~
According to a preferred embodiment, particularlyintended to reduce the effect of the centrifugal force on the wire tension adiusting system, the machine is characterized in that in the lever system, the lever pin and the axis of rotation of the pulleys on the lever are in a position radial ~.~Zt;~
to the axis of rotation of the machine.According to a further embodiment, the st~anding machine is characterized in that the wire to be payed-off, before passing on the swinging pulley of said lever system, travels on a return roller arranged parallel to the bobbin axis and im-mediately outside the bobbin flange.
The present invention will now be better understood from the following detailed description, given by way of non-limiting example and made with reference to the figures of the attached sheets of drawings, in which:
Fig. 1 is a longitudinal view of the machine which, for simplicity's sake, comprises only two pairs of bobbins;
Fig. 2 is a front view of the disc adjacent to a central bobbin and shows the wire tension adjusting means, the bobbin braking means and the bobbin release device;
Fig. 3 illustrates a detail of the wire tension adjusting system in a longitudinal partial view of the machine, but not showing the band brake;
Fig. 4 is a partial perspective view of the machine showing the travel of the wire through the pulleys as far as the inside of the machine shaft; and Fig. 5 illustrates a detail of the bobbin releasing device.
The invention is applicable to machines for manufacturing one-layer strands or several layer strands having alternate senses and/or different pitches.
The following description concerns one of the possible embodiments of the invention; for instance, it concerns a machine 1 (Fig. 1) used to strand several wires 2 about a ~ , ...
t~
central core or, still by way of example, to form a screening about the central part 3, formed by the conductor and relative insulation, of a power cable.
The machine comprises several units 4, equal in number to the number of wires to be stranded. Each unit comprises a hollow shaft 5 (Figs. 1;3) free to rotate about a central support 6, a pair of bobbins 7,8 assembled in idle relation on the shaft 5 at the sides of the support 6 and used simultaneously both to strand and to wind up the wire, their function being inverted in successive steps, a pair of discs 9,10 mounted to idle on the shaft 5 at the sides of the support 6 in an axially inner position with respect to the bobbin, a paying-off element or decoiling arm 11 carried by each disc with a related pulley 12 and intended to pay-off wire from the bobbin and to guide it - by means of a further pulley 13 mounted on the revolving shaft 5 - inside the latter, a single dispenser 14 (Fig. 1) of the wire to be alternatively wound up on either bobbin of the pair of bobbins 7,8, and a system for transmitting motion to the bobbins in the winding-up phase.
The units 4 of machine 1 - iIlustrated in number of two for simplicity's sake - have their respective shafts 5 aligned and separated so as to allow an advantageous connection between the end of the wire payed-off from bobbin 8 in the stranding phase and the end of the adjacent bobbin 7' of other units 4, loaded by dispenser 14 during the stranding phase of bobbin 8.
An appropriate auxiliary shaft 15, by means OL gears or other equivalent driving means provided on supports 6, rotates the shafts 5 and the discs associated with them ~ith suitable means in the stranding phase of the respective adjacent bobbins.
All the units 4 (Fig. 1) are situated between a core paying-off stand 16 and a final station 17 which comprises a P~l~
perforated plate 18, for the passage of the wires 2 through suitable holes, which plate 18 rotates integrally with the shaft of the last unit, a die 19 secured to a base 20 and con-ventional tensioning and collection means (not illustrated).
Therefore, the wires 2 and the core 3 are guided inside the plurality of shafts 5 and are subjected to the tension imparted by the tensioning means.
Of course, when the machine is used to manufacture multi-layer strands, for instance, two-layer strands, the machine units are divided into two successive groups, one for each layer, each group having units whose rotation senses and speeds are egual to or different from, those of the units of the other group, depending on whether the layers have alternate laying senses or not, each group being moreover provided with the relative plate 18 for the passage of the wires and with the thereto associated die 19.
The dispenser 14 of the wire to be alternatively wound up on either bobbin of one same pair and the system for im-parting motion to the bobbins in the winding up phase can be identical to those described in the Canadian Application No.
363,576 of the same applicant filed on October 30, 1980.
In particular, mention is made of the fact that dis-penser 14 comprises an arm 21 which is rotatable through an angle of 180 from one bobbin to the other and which can be moved in a direction parallel to the machine axis with a stroke corresponding to the distance between the flanges of the bobbin and an end pulley 22, able to guide the wire coming from a i`
feeding drum on the machine bobbin, which moves together with arm 21.
The actuation system of the bobbins in the winding-up phase can comprise a central shaft, positioned between the discs and driven by a motor independent of the main shaft 15,and two ~ , , 7h~
lateral shafts, assembled on the discs in idle position and connected to gears of the bobbins. This embodiment foresees specific claw clutches between the lateral shafts and the central shaft, which are ex~lained in detail in the above cited application of the applicant and are not described herein for brevity in the present specification.
Some main characteristics of the invention illustrated in detail in Fig. 2 will now be explained more particularly.
More precisely, such characteristics relate to the c~nnection means between the bobbin and the disc which are able to produce, in the stranding phase, a controlled relative movement to obtain a correct tension of the wire, and to secure the bobbin to the disc when the machine stops, as well as to the means able to disengage the bobbin from the disc to prepare it for reloading with new wire and during the latter step.
These means, the same for each unit of the machine, are described with reference to bobbin 8 and to disc 10 of Fig. 1.
The connection means comprises (Fig. 2) a band brake 23 acting on bobbin 8, a lever system 24 sensitive to the variations of tension of t~e wire payed-off from bobbin 8, an element 25 arranged between the lever system 24 and the band 23 for trans-mitting a change in the tension of the wire being payed-of which is higher than a pre-established value, saia element being able to vary the braking of the band on the bobbin, adjusting, therefore, to a practically constant value the tension of said wire payed-off.
The band 23 is wrapped - at a pre-established angle -around the periphery of an appropriate brake drum 26 secured to the bobbin, one end 27 of the band being connected to a fixed point on disc 10 and the other end 28 being subjected to the action of a first spring 29 having such characteristics and _9_ ~' . . .
., ~Z~i'71~
ap~lled to the disc in such a manner as to transit to the band a braking force able to stop the bobbin, loaded with the wire and rotating at the rated speed, at the same moment at which the machine is stopped.
Preferably, the band brake 23 comprises a plate 30 rotatable about a pin 31 parallel to the disc 10 axis and mounted on the disc. The plate 30 is attached to, respectively applied on opposite parts with respect to the pin 31, a first end 32 of the first spring 29, the second end 33 of which is secured and stretched on a part 34 fast with the disc 10, and an end 35 of the element 25 which transmits the variation of the wire tension between the lever system 24 and the band 23.
The plate 30 carries moreover the end 28 of band 23, the connection being made at the same side - with respect to the pin 31 - on which is applied the first spring 29.
By means of the above indicated arrangement, the first spring 29, subjected to tension by the action exerted on end 33 secured to the disc, originates with respect to pin 31 a rota~ -tion of plate 30, the sense of rotation - as shown in Fig. 2 -being such as to wrap closely the band 23 around the brake drum and to impart to it the maximum braking force.
The release of this braking action depends on the action exerted on plate 30 by element 25 in accordance with the oscil-lations of system 24 providing the wire tension adjustment, which will now be explained in detail.
Substantially, said lever system 24 is based on the use of a lever, having a rotation pin on an appropriate support fast with the disc, and with sides respectively subjected to the action of the wire and to that of an opposing spring 43.
The spring 43 has pre-established characteristics, in the sense that it ensures an unvaried position of the lever as : ::
~Z~i7~L
lor.g as the wire does not exceed a pre-established tension; in the contrary case, the oscillation of the lever act~ on the transmission element 25 and the bobbin is released to bring again the wire tension to a practically constant value.
Several typical solutions in respect of the wire tension adjusting system can be provided iII accordance with the above indicated principle. The preferred one will be described here-below.
Said solution comprises a lever 36 whose mounting pin 37 is associated with a support 38 (see Figs. 3,4) extending in a direction substantially parallel to the bobbin axis. The side 39 of the lever bears a pulley 41 having an axis of rotation 42, whilst the side 40 is, instead, subjected to the action of a second spring 43 having the already cited function and shown in Fig. 2. The pin 37 of the lever is directed radially to the bobbin axis (see Figs. 3,4) so that the lever can swing along planes orthogonal to said direction, with the advantageous result not to be subjected to the influence of the centrifugal forces involved, which might otherwise compromise the whole adjusting system.
The second spring 43 has one end 44 applied to a fixed point on the disc 10 and the other end ~5 fixed to a further lever 46 (Figs. 2,3) which has a pin 47 in orthogonal position to the disc and associated thereto and a side 48 associated at 48' to lever 36 by means of connections (not shown) comprising a pin slidable in accordance with the oscillations of the system provided at the fork end of side 40 of lever 36.
The end ~14 of the spring can be situated on the disc in different positions in order to vary the load of the same springs.
Regulation means of conventional type (not illustrated) are pro-vided for this purpose.~
~Ztit71~
The second lever 46 is attached moreover (Fig. 2), and associated with it, to the end 49 of the transmission element 25 between the lever system 24 and the band brake 23.
In one embodiment, said element 25 is flexible and transmits only tension forces. For instance, it is a metallic rope or a nylon string whose end 49 is connected to the lever 46, at the opposite side of spring 43 with respect to the position of pin 47.
The use of a metallic rope instead of a rigid element represents a further advantage of the invention. In fact, being flexible, the rope can be curved by passing, for instance, over a pulley 25' associated to the disc (Figs. 2,5), permitting an easy arrangement of both springs inside the space defined by the rope itself. Effectively, in this case, the two springs can be situated very near to the centre of rotation of the disc 10, reducing therefore the influence of the centrifugal force and, ultimately, affording the advantage of a correct braking of the bobbin.
Still with reference to the preferred embodiment con-cerning the lever system 24, description will now be made ofthe travel of the wire payed-off from the bobbin, before and~
after its passage about the pulley 41 swinging about pin 37.
The wire 2 outcoming from the bobbin 8 is at first directad on the return roller 50 (Fig. 4), which is mounted to idle on shaEt 11 :in a direction parallel to the bobbin axis and immeaiately outside flange 51. Then, it passes around pulley 41 of lever 36, and then it is directed around pulley 52 which idles on shaft 11, in a way independent from roller 50.
Subse~uently, it is deviated towards pulley 13 mounted on the shaft 5 and then passes inside the shaft 5 towards the stranding station.
According to the above cited preferred solution, the wire 2, instead of passing at first on a pulley integral with a paying-off arm and then on a pulley secured to the shaft 5, namely instead of following a practically rectilinear travel, the wire 2 travels along a multi-directional line, namely is substantially deviated several times, hence, with a reduction of the maximum radius of the rotating parts of the machine owing to the presence of the return roller 50, on which the wire passes directed to pulley 41, and with the consequent possi-bility of increasing the machine speed because - the radial dimensions being reduced - the problems regarding balance and structure are less, so that a lesser power absorption due to aerodynamic resistance is achieved.
The further main characteristic of the machine, regarding the means for releasing the bobbin from the disc to prepare it to be reloaded with new wire and during said phase, will now be explained.
Said means (Figs. 2,5) comprise a device 53 permanently secured to disc 10 and moved into rotation with the latter even during the stranding phase.
The device 53 acts on one of the two ends of the first spring of the band brake 23 and is based on the principle of stretching said spring during the stranding phase and of allowing an approach of the spring ends and therefore a reduction of the relative camber, with release of the bra~e when the machine stops.
As indicated in the figures, the device 53 acts on the second end 33 of spring 29 and comprises a peg 54 and a seat 55 on the disc 10, intended to receive the end of the peg pushed by a small spring 56.
On its turn, said peg 54 can be situated at the end of a -~13-7~
lever 57 having a rotation pin 58 on the disc lO, an end 33 of spring 29 being applied to said lever 57 in a position opposite to the peg 54. The device further comprises a handle 58' to rotate the lever 57 in the clockwise direction with reference to Fig. 2, thus releasing spring 29 and opening the band brake 23.
After the description of the main features of the in-vention, it will be easy to understand the relative working operations herebelow indicated, starting from the arrangement of Fig. 1, in which the bobbin 7,7' and 8,8' of the units of machine 1 work in the winding phase and in the stranding phase, respectively.
During the reloading with new wire, the disc 9 of bobbin 7 is secured, for instance, by a pin, to the central support 6 with an appropriate orientation which is just selected to move the paying-off arm ll downward and to avoid any interference with the wire guiding system 14.
The bobbin 7 is rotated by the motor purposely included for re-winding the wire coming from a feeding drum and/or reel, an adjusting action on the coils to be formed being exerted by dispenser 14 which moves in one sense or in the opposite sense the moving arm 21 and the pulley 22 at a speed correlated, by a pre-established rate, to the revolutions of bobbin 7.
The winding up of new wire on bobbin 7' is carried out in an analogous manner.
During the stranding phase, disc lO of bobbin 8 is connected, for instance, by a pin, to an appropriate flange, not shown, of shaft 5, which is rotated by the~auxiliary shaft 15, and the transmission motion for reloading the bobbln with new wire is interrupted.
The bobbin 8 is rotated about shaft 5 in consequence -of the tension exerted on the wire 2 by the tensioning means, 71~
and said wire ~ is guided in its passage from the outside to the inside of shaft 5 at first through its contact with the periphery of the return roller 50 (Fig. 4), then on pulley 41 of the adjusting lever 36, then on pulley 52 at the end of roller 50 and finally on pulley 13, the mounting of which rotates with shaft 5.
Simultaneously with wire 2, the cable core 3 passes inside shaft 5. Also, said core 3 is subjected to the tension exerted by the tensioning means and is directed from the paying-off stand 16, through the hollow shafts of all units 4 of the machine, towards the stranding station 18-19.
Still in this phase~the tension of wire 2 passing over pulley 41 on the swinging lever 36 is balanced by the reaction force of the spring 43 (Fig. 2). The tension resulting from ; said balance, through the metallic rope 25, exerts a reducing action on the braking of band 23 exerted by spring 29, the band 23 being around the brake drum of the bobbin.
When the machine stops for any reason, disc 10 is braked separately by a suitable brake, for instance pneumatically actuated~ and bobbin 8 tends still to rotate relative to the disc.
Consequently, a slackening of the wire takes place, so that the action exerted by the wire on the band brake 23 through the pulley 41 and the swinging lever 36 and intended to reduce the braking action is eliminated. Therefore, the brake, no longer subjected to the tension exerted on the metallic rope 25, may apply its maximum braking force, giving rise to a closer coupling between disc 10 and bobbin 8 until their relative movement is stopped.
The operation of bobbin 8' in the stranding phase takes place analogously to what is indicated for bobbin 8.
~ '~
In the intermediate steps, the inversion in the function of the bobbins of a same unit occurs as follows:
- when the machine is stopped, the bobbin 7 is disengaged from the motor intended to reload new wire and disc 9 is coupled to a suitable flange of shaft 5;
- then the end of the wire on bobbin 7 is connected to the end of the wire on the bobbin which is already empty and which is carried by the adjacent unit nearest the stranding station 19.
An analogous system is used to prepare for the stranding phase the bobbins reloaded with wire in the preceding phase in all the units of the machine.
Then the bobbin 8, already empty, is prepared to its subsequent reloading with new wire.
This is carried out by acting on handle 58l (Figs. 2,5) of device 53, thus causing the disconnection of peg 54 from its seat 55 on disc 10 (Fig. 5) and the consequent release of spring 29, which results in the release of the bobbin.
Then - with bobbin 8 free to rotate - the following operations are carried out:
- at first disc 10 is angularly moved in such a way that the paying-off arm 11 does not interfere with the position to be taken by dispenser 14 with its wire~
guiding arm 21; ~;~
- th~e moving arm 21 is then rotated through 180 until pulley X2 is aligned with bobbin 8;
- the disc 10 is secured to the support and the wire reloading motor is mechanically connected to bobbin 8;
- at last the wire coming from the feeding drum or resl is guided around pulley 22 and hence around bobbin 8 and the reloading of bobbin 8 is started.
~ .
~26~
In particular, the invention has the advantage that the bobbin braking elements, namely the two springs and the brake band, are arranged in a position extremely near to the disc, ::
without an excessive deviation in axial direction, so that they, together with the other parts of the machine, contribute to the arrangement of many pairs of bobbins in a relatively reduced area.
Although the present invention ha~ been described and illustrated with reference to a preferred embodiment, it is : -understood that its.scope includes any other possible embodiment deriving from the above indicated inventive principle.
-17- :~
.A.
Claims (16)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a stranding machine for supplying wire to a stranding station, said machine having a unit comprising a hollow shaft rotatably mounted on a support, a pair of bobbins rotatably mounted in spaced-apart positions on the shaft, each of the bobbins being adapted to receive wire or to dispense wire for stranding, a pair of spaced discs rotatably mounted on the shaft intermediate the bobbins, means for securing a disc to the shaft for rotation therewith when the adjacent bobbin is dis-pensing wire, and paying-off means on each disc for paying-off wire from a bobbin and into the interior of the shaft, the combination therewith of control means carried by each of the discs for controlling the relative movement between a bobbin and its adjacent disc while wire is being dispensed from the last-mentioned bobbin and for securing said last-mentioned bobbin against relative movement between the last-mentioned bobbin and its adjacent disc when the machine stops and release means for disengaging the last-mentioned bobbin from its adjacent disc to permit relative movement between the last-mentioned bobbin and its adjacent disc for reloading the last-mentioned bobbin with wire.
2. A wire stranding machine as set forth in claim 1 wherein each said control means comprises a brake drum coupled to a bobbin for rotation therewith, a brake shoe or band mounted on the disc adjacent to the last-mentioned bobbin for engagement with the brake drum, one portion of the shoe being secured to the last-mentioned disc and another portion of the shoe being coupled to the last-mentioned disc by spring means which urges the shoe toward the drum, lever means mounted on the last-mentioned disc and operable by the wire being dis-pensed from the last-mentioned bobbin in accordance with the tension on the wire and an interconnecting element inter-connecting the lever means and the shoe so that increased tension on the wire reduces the braking force applied to the brake drum whereby the tension on the wire may be maintained at a substantially constant value as it is payed-off a bobbin and when the machine stops, rotation of a bobbin relative to its adjacent disc is stopped.
3. A wire stranding machine as set forth in claim 2 wherein said lever means comprises a first lever pivotally mounted on the disc and carrying a rotatable pulley at one end thereof over which the wire passes, a second lever pivotally mounted on the disc and engagable at one end with the other end of said first lever, said element being connected to said second lever adjacent the one end thereof, and further spring means connected to said second lever and acting in a direction which causes said element to reduce the braking force applied to said drum.
4. A wire stranding machine as set forth in claim 2 wherein said release means comprises an arm pivotally mounted on the disc and wherein said first mentioned spring means extends between said shoe and said arm, said arm being movable to a position in which the force applied to the shoe by the first-mentioned spring means is negligible.
5. A wire stranding machine as set forth in claim 3 in which the pivot axis of said first lever and the axis of rotation of the pulley thereon extend radially of the hollow shaft.
6. A wire stranding machine as set forth in claim 3 wherein there is a return roller rotatably mounted on the disc with its axis parallel to the bobbin axis, said roller being mounted adjacent to the bobbin, and wherein the wire passes at least partly around the roller during the stranding phase.
7. A wire stranding machine as set forth in claim 6 wherein said return roller is rotatably mounted on a shaft extending from the disc and further comprising a further pulley rotatably mounted on said shaft, the wire also passing at least partly around the further pulley.
8. A wire stranding machine as set forth in claim 7 further comprising a feed pulley mounted on the hollow shaft for feeding the wire into the interior of the hollow shaft, the wire passing from said further pulley to said feed pulley.
9. A wire stranding machine as set forth in claim 2 wherein the spring means is connected at one end to a plate rotatably mounted on the disc, the end of the spring means being connected to the plate, at one side of the axis of rotation thereof and the other portion of the shoe being connected to the plate at said one side of the axis of the plate and wherein the interconnecting element is connected to said plate at the opposite side of the axis of the plate.
10. A wire stranding machine as set forth in claim 9 wherein the interconnecting element is a flexible element.
11. A wire stranding machine as set forth in claim 10 wherein the interconnecting element is a metal rope.
12. A wire stranding machine as set forth in claim 11 further comprising a circular guide rotatably mounted on the disc, said rope passing over at least part of the circular guide and said spring being disposed radially inwardly of said rope.
13. A wire stranding machine as set forth in claim 4 wherein said arm is pivotally mounted on a peg removably received in a seat in the disc.
14. A wire stranding machine as set forth in claim 13 wherein the peg is urged into the seat by spring means acting between the arm and the peg.
15. A wire stranding machine as set forth in claim 1 further comprising at least one further said unit mounted adjacent the first-mentioned unit with the hollow shaft of the first-mentioned unit axially aligned with and spaced from the hollow shaft of the further unit.
16. A wire stranding machine as set forth in claim 15 further comprising means on each unit for supplying wire to an empty bobbin when it has been released by the release means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT07219/79A IT1165923B (en) | 1979-12-12 | 1979-12-12 | CENTRAL SPOOLS CORDING MACHINE |
| IT7219A/79 | 1979-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126711A true CA1126711A (en) | 1982-06-29 |
Family
ID=11124822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA366,612A Expired CA1126711A (en) | 1979-12-12 | 1980-12-11 | Stranding machine provided with central bobbins |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS56107092A (en) |
| AR (1) | AR223258A1 (en) |
| AU (1) | AU532071B2 (en) |
| BR (1) | BR8008139A (en) |
| CA (1) | CA1126711A (en) |
| DE (1) | DE3046940A1 (en) |
| DK (1) | DK156837C (en) |
| ES (1) | ES8202449A1 (en) |
| FI (1) | FI69319C (en) |
| FR (1) | FR2471439A1 (en) |
| GB (1) | GB2064611B (en) |
| IT (1) | IT1165923B (en) |
| NO (1) | NO157185C (en) |
| NZ (1) | NZ195534A (en) |
| SE (1) | SE462878B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20040609A1 (en) * | 2004-03-29 | 2004-06-29 | Cortinovis Spa | TUBULAR CORDING MACHINE |
| CN101737566B (en) * | 2008-11-07 | 2012-11-14 | 江苏江扬建材机械有限公司 | Prefabricated pipe winding machine |
| CN103440930B (en) * | 2013-09-12 | 2016-08-31 | 兰州众邦电线电缆集团有限公司 | The unwrapping wire strand body of cable cabling machine |
| KR102284956B1 (en) | 2014-08-18 | 2021-08-03 | 에디 커런트 리미티드 파트너쉽 | Tuning of a kinematic relationship between members |
| KR102449222B1 (en) | 2014-08-18 | 2022-09-28 | 에디 커런트 리미티드 파트너쉽 | Tuning of a kinematic relationship between members |
| JP6721250B2 (en) | 2014-08-18 | 2020-07-08 | エディ・カーレント・リミテッド・パートナーシップ | Latch device, rope feeding device, passenger seat restraint device, vehicle and zip line |
| DE102014219356A1 (en) * | 2014-09-25 | 2016-03-31 | Zf Friedrichshafen Ag | Vibration damping system |
| CA2969407C (en) | 2014-12-04 | 2022-10-11 | Eddy Current Limited Partnership | Latch activation between elements |
| WO2016089226A1 (en) | 2014-12-04 | 2016-06-09 | Eddy Current Limited Partnership | Methods of altering eddy current interactions |
| CA3220079A1 (en) | 2014-12-04 | 2016-06-09 | Eddy Current Limited Partnership | Energy absorbing apparatus |
| WO2016089228A1 (en) | 2014-12-04 | 2016-06-09 | Eddy Current Limited Partnership | Eddy current brake configurations |
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| CN108221419A (en) * | 2018-01-25 | 2018-06-29 | 河南四达石墨新材料有限公司 | A kind of vertical stranding machine for graphite glass composite band |
| CN109626124B (en) * | 2019-02-15 | 2023-12-26 | 江苏俊知光电通信有限公司 | Automatic accurate tension control cage twisting machine for outdoor optical cable |
| CN110459365A (en) * | 2019-04-03 | 2019-11-15 | 广西松发线缆有限公司 | A kind of cable pipe twisting machine |
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| CN115142285B (en) * | 2022-08-03 | 2023-08-04 | 兰陵县瑞生绳业有限公司 | Device for reinforcing tightness of rope core wrapped by outer rope leather |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1216321A (en) * | 1958-10-06 | 1960-04-25 | Cta Comp Ind Textiles | Advanced twist-wire device |
| US2331648A (en) * | 1942-07-23 | 1943-10-12 | Western Electric Co | Strand twisting apparatus |
| DE1510103A1 (en) * | 1966-01-21 | 1970-02-12 | Kabel Metallwerke Ghh | Spool brake |
| JPS4845635A (en) * | 1971-10-19 | 1973-06-29 | ||
| DD106066A1 (en) * | 1973-08-24 | 1974-05-20 | ||
| JPS5138820A (en) * | 1974-09-27 | 1976-03-31 | Matsushita Electric Ind Co Ltd | SUIHEIHENKOSHUTSURYOKUSOCHI |
-
1979
- 1979-12-12 IT IT07219/79A patent/IT1165923B/en active
-
1980
- 1980-11-10 AU AU64237/80A patent/AU532071B2/en not_active Expired
- 1980-11-12 NZ NZ195534A patent/NZ195534A/en unknown
- 1980-11-21 FI FI803638A patent/FI69319C/en not_active IP Right Cessation
- 1980-12-03 FR FR8025671A patent/FR2471439A1/en active Granted
- 1980-12-09 AR AR283545A patent/AR223258A1/en active
- 1980-12-10 BR BR8008139A patent/BR8008139A/en not_active IP Right Cessation
- 1980-12-10 SE SE8008684A patent/SE462878B/en not_active IP Right Cessation
- 1980-12-10 GB GB8039603A patent/GB2064611B/en not_active Expired
- 1980-12-11 CA CA366,612A patent/CA1126711A/en not_active Expired
- 1980-12-11 JP JP17520280A patent/JPS56107092A/en active Granted
- 1980-12-11 NO NO803743A patent/NO157185C/en not_active IP Right Cessation
- 1980-12-12 DE DE19803046940 patent/DE3046940A1/en active Granted
- 1980-12-12 ES ES498314A patent/ES8202449A1/en not_active Expired
- 1980-12-12 DK DK532880A patent/DK156837C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ES498314A0 (en) | 1982-02-01 |
| AU6423780A (en) | 1981-06-18 |
| IT7907219A0 (en) | 1979-12-12 |
| AU532071B2 (en) | 1983-09-15 |
| FI69319C (en) | 1986-01-10 |
| DK156837B (en) | 1989-10-09 |
| JPH0128153B2 (en) | 1989-06-01 |
| NO157185C (en) | 1988-02-03 |
| GB2064611B (en) | 1983-06-02 |
| NO157185B (en) | 1987-10-26 |
| SE462878B (en) | 1990-09-10 |
| FI69319B (en) | 1985-09-30 |
| GB2064611A (en) | 1981-06-17 |
| JPS56107092A (en) | 1981-08-25 |
| NZ195534A (en) | 1984-07-06 |
| DE3046940A1 (en) | 1981-09-03 |
| FR2471439B1 (en) | 1983-11-25 |
| NO803743L (en) | 1981-06-15 |
| DK532880A (en) | 1981-06-13 |
| DE3046940C2 (en) | 1991-05-23 |
| IT1165923B (en) | 1987-04-29 |
| AR223258A1 (en) | 1981-07-31 |
| FR2471439A1 (en) | 1981-06-19 |
| DK156837C (en) | 1990-03-12 |
| ES8202449A1 (en) | 1982-02-01 |
| FI803638L (en) | 1981-06-13 |
| BR8008139A (en) | 1981-06-30 |
| SE8008684L (en) | 1981-06-13 |
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