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
  • B65H51/00—Forwarding filamentary material
  • B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
  • B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
  • B65H51/08—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements
  • B65H51/10—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements with opposed coacting surfaces, e.g. providing nips
  • B65H51/105—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate in groups or in co-operation with other elements with opposed coacting surfaces, e.g. providing nips one of which is an endless belt
• • 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
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
• • 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
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
  • B65H59/12—Stationary elements arranged to deflect material from straight path
  • B65H59/14—Stationary elements arranged to deflect material from straight path and provided with surfaces imposing additional retarding forces on material
• • 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
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
  • B65H59/18—Driven rotary elements
• • 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
  • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
  • B65H59/20—Co-operating surfaces mounted for relative movement
  • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
  • B65H59/28—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged towards each other
• • 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
  • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
  • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
  • B65H59/388—Regulating forwarding speed
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02H—WARPING, BEAMING OR LEASING
  • D02H13/00—Details of machines of the preceding groups
  • D02H13/22—Tensioning devices
  • D02H13/26—Tensioning devices for threads in warp form
• • 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
• • 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
  • B65H2701/38—Thread sheet, e.g. sheet of parallel yarns or wires

Definitions

• the invention is concerned with a mode of operation and a construction for the unwinding of yarn reels, bobbins and spin cakes from a creel (rack with reels) and placing these yarns under the same correct tension as each other for the purpose of supplying them to a machine for further processing.
• the fibres are fixed by impregnation with synthetic resin, ias is:usual for the manufacture of so-called prepregs, unidirectional material or the winding under. . tension round a (temporary) carrying core, it can be advantageous to bring them to a; . level of prestress to be further determined.
• the correct and equal tension of all the fibres is extremely important if the tensile strength of the fibres is critical for the correct working of the end product, as is the case with wound synthetic flywheels, high-pressure tanks, and synthetic rotors for ventilators and generators, among other things.
• the operating method in question does not have the above mentioned disadvantages of the current technical possibilities and can be advantageously implemented in situations where there is a need for an exact tension regulating, where many exit points are required simultaneously and with a high degree of accuracy, such as the manufacture of wide prepregs for the aircraft industry, printed circuit board manufacture and the manufacture of extremely lightweight sandwich panels. In those cases it is not unusual for a fibre bundle width of 1mm to contain 1,000 to 1,500 fibre bundles.
• the aim of the invention in question is, in a simple and inexpensive way, to bring about that the out-fed fibres all have the same tensile stress, within narrow tolerances independent of the randomly fluctuating force with which they are introduced. While the invention is also suitable for the transport and tensioning of materials with a more continuous structure such as on a production line for paper, plastics, composite materials or textiles, the invention will be further explained here by means of it's preferred application in the sphere of fibre transport.
• ABS Anti-Blocking System
• the very aim is to limit the drive power to a maximum level that can be compared to a similar maximum level of the adjacent fibre bundles.
• tension in warp fibres or fibres of a prepreg or fabric can only arise in the case of an equal elasticity of the warp threads of fibres.
• this reasoning it is so that if the passage of the. end product via a roller can take place slip-free with a peripheral velocity v 2 and the supply , of all warp threads can take place slip-free with a velocity vi , the elasticity between out- feed and supply for all warp fibres is equal.
• the coefficient of friction f depends on the properties of the material between the elements that cause the friction, here the fibre and the rod surface, and can therefore only be influenced to a limited extent, a higher friction required can be achieved by increasing the encircled section ⁇ of the rod.
• the fibre bundles are lying next to each other so that the circumference of the rod is only usable to a limited extent.
• the invention in question then also includes the increasing of the angle of contact by the application of more rods whereby the bundles of fibre can go round each rod to a maximum of almost 180 .
• a further improvement to the invention is created by rotating the rods in the direction of the transport with a peripheral velocity that is marginally smaller than the velocity of the fibre.
• each fibre or bundle of fibres has as it were its own imaginary surface across the entire installation in which all the necessary processing takes place.
• What is new is the idea that with the use of several rollers the tension in different fibres that at the start of the process may have very large differences in value from each other, irrespective of the starting tension and the differences from each other, after a particular number of rollers and remaining in their own flat plane, is reduced to a tension level that is virtually nil.
• the tension differences to be reconciled, the required accuracy, the coefficient of tension and the total (part) encirclement determine the number of rolls.
• the number of fibres that are simultaneously available in the process has no effect on the process, but only on the total required pair and the strength of the construction.
• the invention consists of the fact that this tension reduction can be used in the first part by transporting the fibres to the second part, a slip lock unit, out of which they are, in the third part, transported across a number of rollers and each brought to the required equal tension.
• the slip lock unit is constructed such that the fibres cannot slip in the unit. Control of this tension can be simply carried out automatically by measuring the result of a measuring roller under prestress preferably resting at right angles to the fibres moving over it and hereupon changing the total (part encirclement of the rollers of the first processing phase in such a way that the result of the measuring roller returns to the required state.
• the in absolute values very small difference in tension before the unit manifests itself as a very small difference in velocity.
• the final tension of all the fibres is near enough the same.
• the absolute difference between each of the tensions before the slip lock unit is determined by the difference in tension at the start of the process, the number of rollers, the coefficient of friction f and the angle of contact ⁇ across all rollers and can therefore b reduced to a required minimum.
• the invention also provides an improvement to a slip lock unit by applying an endless belt with elastomer properties, which is transported over one part of the circumference of a roller.
• the fibres are pressed onto the roller by the belt, without a great deal of deforrning arising in the fibres or in the belt or the surface of the roller.
• the large surface nevertheless makes it possible to apply a large frictional force to the fibres.
• the small deformations make it possible to transport the fibres through the unit without slippage and at a constant and known velocity, whereby the unit is not very sensitive to the tensions present in the fibres.
• the mode of operation consists of the following three processing phases: 1. Reducing the tension of the fibres from an arbitrary individual stress level to a stress level of nil or near enough nil. 2. Slippage free transport of the fibres through a slip lock unit at a known velocity determined in advance. 3. Building up the tension of each fibre equally from the nil stress level to the required collective stress level.
• the diameter of these rollers is therefore preferably chosen to be not too small. This also has the consequence that the bending stress of the individual fibres in the bundles of fibres remains fractionally low so that breakage of fibres in the construction is ruled out and the ends of the fibres even after any preceding breakage will simply be carried along in the fibre bundle package and therefore not cause any snags (the rolling up of individual fibres in a bundle of fibres as a consequence of the frictional working of stationery guiding elements).
• the invention further encompasses an arrangement for the execution of the mode of operation described above.
• Such an arrangement is according to the invention provided with a first part (de-tensioner) with at least one but preferably a number of cylinder shaped rotating elements (rollers) of which each roller can rotate on its own axle with a peripheral velocity that according to a preferred realisation is higher than the required transport velocity whereby the fibres to be transported are preferably led round the rollers in a loop in order to realise an encirclement of these rollers whereby a greater total angle of contact can be achieved than would be possible with only one roller, and a second part (slip lock unit)with at least one roller with a rigid or at least relatively non- distortable surface wherein a part of the transport, by pairing with an accompanying pressure element, preferably consists of an endless transport belt or a roller with compressible surface that exerts a frictional force on the fibres between the surfaces so that they are transported without slippage at the transport velocity of the roller with a rigid surface and therefore determines the velocity of the
• One arrangement with a very good ease of operation and suitable for a large diversity of frictional properties can be achieved by the (part) encirclement of a larger number of identical rollers whereby all the uneven numbered rollers are placed on a first part of the frame above each other at a distance from each other that is twice the diameter of one roller and all the even numbered rollers are placed on the second part of the frame above each other all at the same distance whereby through the approaching of the first part of the frame by the second part of the frame the even numbered rollers can pass over the uneven numbered rollers without them touching each other in such a way that the rotation axles of all the rollers maintain there parallelism, all with each other.
• the arrangement also provides reduction in wear and tear to the fibre and to the equipment as a consequence of the continuous slippage between the cylinder shaped elements and the fibres, by driving the cylinder shaped elements in the third part of the arrangement with a transfer velocity that is slightly less than the required throughput velocity of the fibres.
• rollers with a wear-resistant layer for example achieved by hardening the surface.
• a wear-resistant layer for example achieved by hardening the surface.
• One important positive consequence of the preferred construction according to the invention is also that through the slippage between the bundles of fibres and roller surfaces a particular maximum friction by the cylinder on the bundle of fibres can be transferred and therefore the amount of the slippage is unimportant for the correct working of the arrangement. This means that the rollers that rotate in relation to the fibre bundles with slippage do not have to be completely round and can therefore be constructed simply and cheaply.
• Figure 1 shows a schematic illustration of the physical principle upon which the invention is based.
• Figure 2 shows a schematic illustration of the entire construction according to the essence of the invention.
• Figure 3 shows a schematic illustration of the de-tensioner and the slip lock unit according to the invention, whereby the construction is in a state whereby ribbons, threads, filaments, fibres or bundles can be simply transported in the construction.
• Figure 4 shows a schematic illustration of the de-tensioner and the slip lock unit according to the invention, whereby the two parts of the frame are moved towards each other with respect to the position in Figure 3 and the ribbons, threads, filaments, fibres or bundles are in contact with a part of the circumference of the rollers.
• Figure 5 shows a schematic illustration of the de-tensioner and the slip lock unit according to the invention, whereby the two frame parts are moved further towards each other with respect to the position in Figure 4 and the ribbons, threads, filaments, fibres or bundles are in contact with a larger part of the circumference of the rollers.
• Figure 6 shows a schematic illustration of the tensioner according to the invention.
• Figure 1 shows a bundle of fibres that is moving over a driven roller at a particular velocity (v).
• the bundle of fibres partly encircles the roller at an angle ( ⁇ ).
• the roller rotates in the direction shown at the peripheral velocity ( ⁇ * R).
• the coefficient of friction of the roller surface amounts to (f).
• FI is the tensile force in the bundle of fibres before the roller.
• F2 is the tensile force in the bundle of fibres after the roller.
• Figure 2 shows in which way a single fibre coming from one of the exit points (30i to 30iii inclusive) and in the virtual plane represented by the illustration goes through all the processing steps via a free-turning roller (31) that serves to make the (part) encirclement for all parallel fibres the same to the de-tensioner in the construction.
• This is a first processing step by transporting the fibre alternatively left and right over the rollers (16) and (5) whereby because of the slippage of the fibre with respect to the periphery of the roller, the force in the fibre is further reduced by each partial loop until a negligible force remains.
• the sum of the remaining forces of all parallel fibres can be determined using a measuring roller (32) that is pressed more or less at right angles on the fibres that are travelling from the de-tensioner to the slip lock unit and of which the depression or the pressing force determines this remaining force.
• the slip lock unit the fibres are pressed between the roller (7) and the endless belt (11) so that the transport velocity of all fibres is determined by the peripheral velocity of the roller (7).
• the so-called tensioner by equal lengthening of all parallel fibres as a consequence of the alternately left and right pulling of the fibres with slippage over a number of rollers (25) and (29) an equal and desired tension is built up in all the fibres.
• the tensile force mentioned is supplied by the following process, for example by a warp beam winding device.
• This tension results in a sum of the forces of all the fibres, which force can simply be determined on the basis of a measuring roller (33) that is pressed more or less at right angles on the fibres that are travelling from the tensioner to the next process and of which the depression or the pressure force determines the remaining force in the fibres.
• FIG 3 is a schematic illustration of the de-tensioner and the slip lock unit in a state whereby the ribbons, threads, filaments, fibres or bundles (12) can be fed easily through the construction.
• the fibres (12) come from a supply (not shown) and are transported between the rollers (5, 16).
• the fibres are then led over a roller (7), whereby the fibres are pressed onto the surface (8) of the roller by a belt (11).
• This combined action of roller (7) and belt (11) forms a slip lock unit.
• the belt (11) is tensioned by rollers (9).
• the rollers (5) are supported on bearings connected to frame part (1) and the rollers (16) are supported on bearings connected to frame part (2). Both frame parts can move with respect to each other whereby a guide (3) only permits one degree of freedom.
• Figure 4 is a schematic illustration of the de-tensioners and the slip lock unit in a state whereby the ribbons, threads, fibres or bundles (12) are fed through the construction and whereby the frame parts (1 , 2) have been moved towards each other as compared with the situation in Figure 3.
• the fibres (12) now make contact with a part of the surface (6, 17) of the rollers (5, 16).
• the peripheral velocity of the rollers (5, 16) is greater than the throughput velocity of the fibres, whereby the arbitrary forces in the fibre bundles from the various exit reels are decreased by partially looping round a first slipping rotating roller, which decrease is continued by the following slipping rotating rollers so that the bundles of fibres are transported with a minimal and negligible level of force and thereby also a minimal and negligible relative difference in forces between a precisely cylindrical rotating roller (7) with a peripheral velocity determined before hand and kept constant on the one hand and an endless transport belt (11) covered with a material that offers sufficient resistance against slippage placed and supported against the roller on the other hand whereby a slippage-free drive of the bundles of fibres (13), by now brought to a very low tension, is achieved.
• Figure 5 is a schematic illustration of the de-tensioner and the slip lock unit in a state whereby the ribbons, threads, fibres or bundles (12) are transported by the construction and whereby the frame parts (1, 2) have been moved closer to each other than the situation in Figure 4.
• the fibres (12) now make contact with greater part of the surface (6, 17) of the rollers (5, 16).
• the angle of the encircled arc ⁇ of the fibres on the rollers has become greater, whereby per roller, under constant conditions, more tension is built up in the fibres.
• Figure 6 is a schematic illustration of the tensioner, whereby the ribbons, threads, filaments, fibres or bundles (24) are in contact with a part of the circumference (26) of rollers (25).
• the rollers have a peripheral velocity that is less then the throughput velocity of the fibres (24) whereby the tension in the fibres is increased by each roller according to the principle shown in Figure 1.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Moulding By Coating Moulds (AREA)
• Treatment Of Fiber Materials (AREA)
• Insulated Conductors (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Looms (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Nonwoven Fabrics (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Tension Adjustment In Filamentary Materials (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34632200

Family Applications (1)

Country Status (13)

Cited By (3)

Families Citing this family (9)

Citations (5)

Family Cites Families (4)

• 2003
  • 2003-11-25 NL NL1024868A patent/NL1024868C1/nl not_active IP Right Cessation
• 2004
  • 2004-11-11 KR KR1020067012574A patent/KR20060097054A/ko not_active Application Discontinuation
  • 2004-11-11 JP JP2006541057A patent/JP2007533571A/ja active Pending
  • 2004-11-11 MX MXPA06005888A patent/MXPA06005888A/es not_active Application Discontinuation
  • 2004-11-11 CN CNA2004800394243A patent/CN1902113A/zh active Pending
  • 2004-11-11 CA CA002547022A patent/CA2547022A1/en not_active Abandoned
  • 2004-11-11 BR BRPI0416919-0A patent/BRPI0416919A/pt not_active IP Right Cessation
  • 2004-11-11 WO PCT/NL2004/000795 patent/WO2005051823A1/en not_active Application Discontinuation
  • 2004-11-11 RU RU2006122533/12A patent/RU2006122533A/ru not_active Application Discontinuation
  • 2004-11-11 EP EP04808711A patent/EP1697247A1/en not_active Withdrawn
  • 2004-11-11 AU AU2004293350A patent/AU2004293350A1/en not_active Abandoned
  • 2004-11-11 US US10/580,591 patent/US20070120286A1/en not_active Abandoned
• 2006
  • 2006-06-26 NO NO20062982A patent/NO20062982L/no unknown

Patent Citations (5)

Non-Patent Citations (1)

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