Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H54/00—Winding, coiling, or depositing filamentary material
  • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
  • B65H54/28—Traversing devices; Package-shaping arrangements
  • B65H54/32—Traversing devices; Package-shaping arrangements with thread guides reciprocating or oscillating with variable stroke
  • B65H54/325—Traversing devices; Package-shaping arrangements with thread guides reciprocating or oscillating with variable stroke in accordance with growth of the package
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H55/00—Wound packages of filamentary material
  • B65H55/04—Wound packages of filamentary material characterised by method of winding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments
  • B65H2701/312—Fibreglass strands
  • B65H2701/3122—Fibreglass strands extruded from spinnerets

Definitions

• the invention relates to the manufacture of windings of wires such as glass wires, and more particularly to the manufacture of windings of frustoconical shape.
• Yarn windings in the form of coils are a common means of temporary storage of yarn for subsequent feeding of yarn processing machines, for example textile machines.
• a spool of thread is formed by combining a series of filaments into a single thread, which is collected on a rotating support where it is wound in a spool.
• glass filaments obtained by the flow of molten glass are stretched through orifices in a die. These filaments are then coated with a size by a coating device so as to facilitate fiberizing and the gathering of the filaments into a thread, and to increase their mechanical properties, in particular with aging. Then these filaments are brought together to an assembly device to give birth to the wire to be wound.
• the wire coming from the assembly device is wound around a support arranged in a horizontal plane perpendicular to the vertical plane of arrival of the wire, and animated by a rotary movement at constant speed.
• the thread to be wound runs on the surface of a thread guide located between the assembly device and the support, and moving in a back-and-forth movement parallel to the longitudinal axis of the support in rotation.
• the spool of thread thus obtained is called cake.
• a cake is rarely used directly for feeding yarn into textile machines, for example. Indeed, the textile machines operate at high speed and the yarn must then be able to be easily extracted from the spool, avoiding any friction which could cause a break, which is difficult to achieve from cakes. It is then necessary to manufacture, from these intermediate coils called cakes, coils of cylindrical shape whose wire is twisted.
• SHEET D smallest diameter and therefore immediately deviates from the coil as soon as a turn comes off.
• the frustoconical shape of the spool, the base of which consists of the flank, is then obtained by assigning a constant value to the speed of rotation of the drawing device and by controlling the speed of movement of the wire guide and the speed of rotation of the support.
• the association of a sidewall at the base of the support is not without causing problems of precision as regards the deposition of the wire in this area.
• the wire at the side can be either deposited in excess, which leads to unwinding the rise in bundle, then causing the breakage of the wire, or deposited in default then causing the scuffing of the wire to unwinding by its pinching between different layers of turns.
• the thread of which has not been subjected to a twisting operation and does not show any undulation it is common to encounter problems of deterioration of the thread because the crossing of the untwisted yarn means that that is to say the angle between two intersecting turns is insufficient.
• a frustoconical coil may be preferred, the two frusto-conical base and unwinding ends of which have distinct generators, that is to say different base and unwinding angles with respect to the axis. of the coil.
• the application JP 10-218 489 although of different application of a winding of glass wire since relating to a supply can of wiring or braiding machines, shows such a form of coil and describes its process for obtaining .
• the construction of the reel is carried out according to four stages which correspond to four successive parts of the reel: the first part consists of the lower part of the bobbin and represents at most half the height of the winding, it is preferably well less than half of the winding, the angle of this frustoconical base relative to the axis of the bobbin being between 16 and 22 °.
• the second part is obtained by means of layers parallel to those of the first part and of identical length, but the thickness of the layers decreases due to an acceleration of the displacement of the cusps upwards of the bobbin.
• the third part built in parallel layers but with an inclination different from those deposited in the first and second parts, fully realizes the unwinding cone whose final angle relative to the axis of the bobbin is less than that of the cone basic.
• the fourth part aims to complete the main body of the coil in cylindrical form by rapidly bringing the low cusp point closer to the high cusp point.
• this method requires on the one hand, four separate winding steps, and on the other hand, the change of deposit inclination of the layers of wire during these steps, which does not simplify its implementation.
• this winding process generates an angle of construction of the first layers with respect to the axis of the coil which is too large for a winding application such as that desired, namely winding glass wire from a pathway.
• This large construction angle induces large variations in circumference between the circumference of the base cone and the circumference obtained at the end of the first step of the process; or, for a winding of glass wire whose drawing speed must be kept constant to keep the constant thread count, such variations in circumference would impose consequent variations in the speed of the support of the coil both in acceleration and in braking, which is difficult to achieve materially.
• the wire guide element for its deposition consists of a guide eyelet which moves parallel to the axis of the support of the rotating coil.
• this guide mode cannot be envisaged for guiding a glass wire for winding, in particular a wire coming directly from a die. Indeed, in the event of breakage of the filaments coming from the die, the restarting of the winding would prove to be too complicated; it is too difficult after collecting the filaments to pass them again through the eyelet which has a closed circumference, it is also impossible with an eyelet to transfer the winding of the thread from one reel to another reel without having to break the wire, which affects the optimization of production times.
• the eyelet has an opening for the passage of the wire that is far too large in relation to the diameter of said wire to allow precise guidance of the deposition of the wire.
• the invention therefore aims to overcome the aforementioned drawbacks and to provide a process for obtaining a frustoconical coil having good mechanical strength and easy unwinding, the winding being done in a horizontal plane without requiring significant modifications of the already existing conventional implementation device.
• the first rule of displacement of the wire guide consists in establishing back-and-forth movements parallel to the axis of the support between an initial position (x 0 ) and a final position (x z ) which correspond, respectively, in a projection perpendicular to the support, to each of the end sections of the coil, each reciprocating movement being defined by:
• ⁇ is a constant which is a function of the slope to be given to the generator of the main body.
• the second rule of displacement of the wire guide consists in making back and forth movements parallel to the axis of the support, between an initial position which constitutes the final position (x z ) of the wire guide according to the first rule and an end position (x t ) located between the final position (x z ) according to the first rule and imposed according to the value of the diameter D2 desired for the wire feed cone to be formed, and the starting position of the last movement according to the first rule, each back and forth movement being defined by:
• the successive starting positions (x k ) according to the second rule are separated by an equal distance ( ⁇ '), and the successive intermediate positions (x m ) of change of direction according to the second rule are spaced by the same distance ( ⁇ ) than that separating the successive starting positions (X j ) according to the first rule.
• the wire guide is moved concomitantly with the movement parallel to the axis X according to a coplanar movement and perpendicular to the axis X so that the resulting movement is parallel to the generatrix of the main body.
• the length thrown remains constant for a deposit of the wire as precise as possible.
• the wound wire has an undulation so that the crossing angle between two turns is between 0.5 ° and 6 °.
• This process is advantageously applied for winding glass wire coming directly from a die.
• FIG. 1 is a longitudinal sectional view of the coil according to the invention on its winding support
• FIG. 3 shows a schematic view of an installation for implementing the method according to the invention
• - Figure 4 shows a side view of a wire guide constituted by a cam through which the wire runs;
• - Figure 5 shows different positions taken by the wire guide on its axis of movement parallel to the support in combination with a partial longitudinal sectional view of the coil.
• FIG. 1 shows a frusto-conical coil 10 produced according to the invention, obtained by winding a wire around a cylindrical support 20 of longitudinal axis X and devoid of any flank at its ends.
• the wound wire is, for example, glass wire.
• the coil 10 comprises a coil body 11 of frustoconical shape and two truncated cones 12 and 13 situated respectively at the two longitudinal and opposite ends of the coil, on each side of the coil body 11.
• the coil body 11 has a base 11a of diameter D1 and an end section 11b of diameter D2 less than the diameter D1, the generatrix L1 of the frustoconical body 11 thus being inclined relative to the axis X at an angle ⁇ .
• the end truncated cone 12 formed in the first place during winding will hereinafter be called the basic cone. It has a base 12a constituted by the base 11a of the coil body 11 of diameter D1, and a termination 12b whose diameter corresponds to that of the support 20.
• the truncated cone 12 includes a generator L2 whose slope forms with the surface of the support 20, or with the X axis, an acute angle ⁇ .
• the second end truncated cone 13 will be called the unwinding cone because its section is always smaller than that of the base cone, the unwinding will be carried out from the latter to facilitate the detachment of the wire from the spool.
• the unwinding cone 13 has a base 13a constituted by the end section 11b of the coil body 11 of diameter D2, and a termination 13b whose diameter corresponds to that of the support 20.
• the truncated cone 13 comprises a generator L3 whose slope forms with the surface of the support 20, or with the axis X, an acute angle ⁇ whose value is independent of that of the angle ⁇ .
• the generators L2 and L3 of the base 12 and reel 13 cones are therefore inclined relative to the axis X in opposite directions so as to be connected to the generator L1 of the frustoconical body 11.
• the coil 10 thus formed of three truncated cones makes it possible to reinforce its mechanical strength as well as to improve the quality of the unwinding and consequently to keep the properties of the wire as best as possible, namely its integrity and its tensile strength.
• This finished product also has great ease of use for further processing of fiberglass.
• the base cone 12 constitutes the place where the most wire can accumulate on the winding, helping to increase the weight of the latter.
• the angle ⁇ can be as close as possible to the perpendicular to the X axis up to a limit which defines the appearance of landslides on winding or transport.
• the angle ⁇ will be between 40 ° and 75 ° relative to the axis X.
• the angle ⁇ of the unwinding cone 13 mainly influences the behavior of the turns at the point of change of direction of the thread guide, also called a cusp, the angle ⁇ will preferably have a value between 30 ° and 60 ° by relative to the X axis.
• Figures 1a to 1d illustrate the combination of the different values of the angles ⁇ and ⁇ according to several lengths of coil.
• the length of the coil between the terminations 12b and 13b can vary between 150mm and 500mm, and preferably between 180mm and 400mm.
• the ease of unwinding which the frusto-conical shape of the spool already provides is embodied by characteristics specific to the wound thread.
• the wound wire 50 has turns 52, two of which are adjacent, intersecting at a crossing angle ⁇ , and has a ripple 51. Obtaining these characteristics will be explained later.
• the winding method according to the invention making it possible to manufacture a coil such as that described above, can be implemented in the context of an installation which is illustrated diagrammatically in FIG. 3.
• the installation comprises a die 30 supplied with glass by a power source not shown.
• the die can be fed from cold glass, obtained and stored in the form of beads in a hopper placed above the die, the die then being heated to melt the glass, or can be directly fed from molten glass, the die also being heated to maintain the glass at a sufficient temperature so that it reaches the viscosity suitable for drawing it in the form of continuous filaments.
• the molten glass flows vertically from a multiplicity of orifices, such as the pins 31, and is immediately drawn into a multiplicity of filaments 40, gathered here in a single ply 41.
• This ply 41 comes into contact with a device coating 32 intended to coat each filament with a size of the aqueous or anhydrous type.
• the device 32 may consist of a tank permanently supplied with a sizing bath and a rotating roller, the lower part of which is constantly immersed in the bath. This roller is permanently covered with a sizing film which is removed in passing by the filaments 40 sliding on its surface.
• the ply 41 then converges towards an assembly device 33 where the different filaments are joined to give birth to the wire 50.
• the assembly device 33 can be constituted by a simple pulley with groove or by a plate provided with a notch.
• the wire 34 such as a cam, to be wound around the support 20 disposed in a horizontal plane relative to the vertical arrival of the wire towards the wire guide.
• the wire is therefore wound by coming directly from the die without an intermediate step such as the prior production of a cake.
• the support 20 is fixed on a spindle 21 which is rotated.
• the support 20 is advantageously hollow, its internal shape matching the external shape of the spindle 21, and its internal section being substantially larger than that of the spindle in order to be threaded and held tight around it by an expansion device of the pin not visible.
• the spindle 21 is rotated by a motor 22 whose drive speed is adjustable.
• the wire guide 34 is driven in a horizontal back-and-forth movement M and parallel to the longitudinal axis X of the support, and preferably, in a horizontal back-and-forth movement N perpendicular to the X axis and carried out in concomitance with the movement M as will be explained later.
• the wire guide 34 is fixed to the end of a movable arm 35 directed by an electronic drive device 36.
• a control device 37 such as a programmable automaton is provided for controlling the movement of the mobile arm 35 and the speed of movement of the wire guide 34 as well as the speed of rotation of the spindle 21.
• the speed of rotation of the spindle 21 and the speed of linear movement of the wire guide 34 parallel to the axis X can vary.
• the implementation of these speed variations can be carried out optionally according to the desired quality of the wire after winding.
• the rotational speed of the spindle is imposed according to the flow rate of the die and the linear mass of the desired thread. As for the speed of the wire guide, it influences the quality of the unwinding.
• the linear mass of the wire corresponds to the ratio of the flow rate of the die to the speed of drawing of the wire. It is always desirable for the linear mass to be constant so that the wound wire has a uniform quality of mechanical strength.
• the variation in section of the coil 10 necessarily involves a variation in the drawing speed. So that the linear mass is constant, it is therefore necessary to maintain constant the drawing speed on the assumption that the flow rate of the die remains constant.
• the thread guide has no effect on wire drawing, the drawing speed depends only on the spindle rotation speed.
• the speed of rotation of the spindle 21, therefore of the support 20, is therefore varied, so that the wire constantly encounters a surface whose peripheral speed is substantially constant.
• the constancy of the linear mass of the wire is controlled by programming the drawing speed imposed by the speed of rotation of the spindle 21 and according to the position of the wire guide corresponding to a given section of the coil.
• the speed of movement of the wire guide it can therefore also vary.
• the angle ⁇ of the generator L1 with the axis X is preserved during the winding, which makes it possible to make the unwinding properties constant regardless of the position of the wire.
• the wire guide 34 is, as we have already indicated, preferably constituted by a cam as illustrated in FIG. 4.
• This cam has a continuous groove 34a in which the wire 50 travels.
• the groove is generally helical in shape and has at least two sections 34b and 34c, the respective slopes of which reverse.
• the cam has a pitch p which corresponds to the width, measured parallel to the axis of rotation, between the two tangential points of passage of the wire on a section for which the curvature of the wire takes place. This step determines the amplitude given to the undulation of the wire.
• the helical shape of the groove makes it possible to give the wire during winding an undulation, the number of sinusoids on a turn and their width are a function of the pitch p of the cam and the speed of rotation of the latter.
• the periodicity of the ripple that is to say the number of sinusoids, acts on the number of crossings of the wire when several layers of turns are superimposed. The proportion of the number of crosses must be advantageously balanced.
• the speed of rotation of the cam is adapted to establish an adequate periodicity of the ripple.
• This speed can be defined with respect to the wire drawing speed, it varies between -10% and + 30% of the value of the drawing speed, and preferably between the value of the drawing speed and + 15% of this value.
• crossings prevent a turn of one of the layers from sliding on the turns of a lower layer, thus achieving better mechanical strength of the coil once formed and facilitating the unwinding of the wire, but the angle of ⁇ crossing also contributes to the precision of cone formation, and prevents the last turn of the coil from being free.
• this length should be short to avoid the risk of tearing of the wire during the release of the turns around the unwinding cone when friction phenomena appear such as that of the double balloon.
• the average value of the angle ⁇ depends on the speed of movement of the wire guide 34 parallel to the axis X and on the speed of rotation of the spindle 21.
• the actual value of the angle ⁇ at each crossing point it also depends on the combination of the displacement of the thread guide and the position of the thread induced by the position of the thread guide at the time of deposition of the thread on the winding surface.
• a suitable mean value of the crossing angle ⁇ is preferably between 0.5 ° and 6 °.
• the winding method according to the invention is based on the reciprocating movement imposed on the thread guide 34. It breaks down into two stages according to two rules respective displacement, the first creating a part of the generator L2 of the base cone 12, and the second ending the generator L2 then simultaneously carrying out the formation of the generators L1 and L3, respectively, of the body 11 and of the wire feed cone 13.
• the first step consists in moving the wire guide between an initial position xo which corresponds to an end position of the spool for which the first turn of the spool is wound, that is to say to the position of the termination 12b of the base cone 12, and a final position x z which corresponds to the position of the opposite end of the spool, that is to say of the base 13b of the unwinding cone 13.
• the thread guide 34 performs several displacements d, back and forth, each of which comprises a outward path a, in the direction of the position x z and a return path R, in the direction of the initial position xo.
• the first displacement d ⁇ comprises the outward journey ai and the return R 1 t the outward journey ai starting from the initial position x 0 and ending at the position xi such that x ⁇ xo + ⁇ , and the return path Ri beginning at the position Xi and ending at position x 0 + ⁇ , the thread guide not returning to the initial position x 0 .
• the starting position x 0 + (z-1) ⁇ of the last displacement is defined according to the desired value of the diameter D1 of the base cone.
• x x 0 + i ⁇ , with i varying from 0 to z, z non-zero integer - and an arrival position constituting the next starting position the last movement of this first stage corresponding to a path to position x ⁇ without return in the opposite direction.
• ⁇ depends on the angles ⁇ and ⁇ that we want to assign to the base and unwinding cones.
• ⁇ a positive constant, depends on the slope that we want to give to the generator L1 and is therefore a function of the value of ⁇ . The higher the value of
• ⁇ is small, the larger the angle ⁇ of the generator L1 with the X axis.
• This value ⁇ is chosen so that the angle ⁇ is between 0.5 ° and 5 °, and preferably between 0.75 ° and 3 °.
• the wire guide 34 moves back and forth between the position x z occupied at the end of the first step and an end position x t for which the desired diameter D2 of the base 13a is reached. of the wire feed cone.
• Each movement comprises a outward path starting at a position x k and a return path starting at an intermediate position for changing direction x m and stopping at an arrival position x k + ⁇ , the thread guide always stopping to change direction to a position prior to the position occupied at the start or at the end of the previous trip.
• the outward and return journeys therefore decrease in distance in both directions.
• the outward journey begins at position x z - ⁇ ', arrives at the intermediate direction change position x 0 + z ⁇ + ⁇ and starts again until position x z -2 ⁇ '.
• the spool body 11 and the unwinding cone 13 are formed.
• the last movement of the wire guide 34 is programmed so that it stops at the position x t , which corresponds to the position x z -t ⁇ ', for which the desired value of the diameter D2 is reached.
• the variation in section of the spool in particular in the direction of reduction at the level of the body 11 and of the unwinding cone 13, generates, when the thread guide moves at constant speed, as the reduction in the section a very significant increase in the thickness of the coil, which results at the end of the winding by a decrease in the angle ⁇ between the generators L1 and L3 can be greater than 1 °.
• the die delivers a constant quantity of glass per unit of time while the wire guide moves at constant speed
• an identical mass of glass per unit of time is then deposited on the support; but the section of the coil is not uniform, a larger amount of wire is deposited as the section decreases.
• the distance separating the thread guide from the surface of the spool increases which leads to a growing imprecision of the deposition of the wire making on the one hand the winding less stable, in particular on the side of the unwinding cone, and on the other hand, disadvantaging the quality of the unwinding.
• the movements are carried out thanks to the mobile arm 35 whose movement is controlled by the electronic device 36.
• the electronic device 36 it would be possible to use mechanical means constituted by a guide rail fixed parallel to the future generator L1 and on which the thread guide 34.

Landscapes

• Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)
• Winding Filamentary Materials (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Storage Of Web-Like Or Filamentary Materials (AREA)
• Unwinding Of Filamentary Materials (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9548390

Family Applications (1)

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Family Cites Families (17)

• 1999
  • 1999-07-22 FR FR9909506A patent/FR2796631B1/fr not_active Expired - Fee Related
• 2000
  • 2000-06-28 CN CN00810721A patent/CN1373732A/zh active Pending
  • 2000-06-28 WO PCT/FR2000/001800 patent/WO2001007350A2/fr not_active Application Discontinuation
  • 2000-06-28 US US10/031,574 patent/US6929211B1/en not_active Expired - Fee Related
  • 2000-06-28 JP JP2001512445A patent/JP2003524562A/ja not_active Withdrawn
  • 2000-06-28 MX MXPA01013335A patent/MXPA01013335A/es unknown
  • 2000-06-28 KR KR1020017016852A patent/KR20020020762A/ko not_active Application Discontinuation
  • 2000-06-28 DE DE60027779T patent/DE60027779T2/de not_active Expired - Lifetime
  • 2000-06-28 CZ CZ20020258A patent/CZ303847B6/cs not_active IP Right Cessation
  • 2000-06-28 EP EP00946031A patent/EP1261543B1/de not_active Expired - Lifetime
  • 2000-06-28 BR BR0012586-5A patent/BR0012586A/pt not_active Application Discontinuation
  • 2000-06-28 CA CA002377262A patent/CA2377262A1/fr not_active Abandoned
  • 2000-08-03 TW TW089114650A patent/TW518310B/zh active

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