EP0351398A1 - Filament winding machine - Google Patents

Filament winding machine

Info

Publication number
EP0351398A1
EP0351398A1 EP19870901573 EP87901573A EP0351398A1 EP 0351398 A1 EP0351398 A1 EP 0351398A1 EP 19870901573 EP19870901573 EP 19870901573 EP 87901573 A EP87901573 A EP 87901573A EP 0351398 A1 EP0351398 A1 EP 0351398A1
Authority
EP
European Patent Office
Prior art keywords
card
drive
winding
driven
axis
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.)
Ceased
Application number
EP19870901573
Other languages
German (de)
French (fr)
Inventor
Peter Foot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0351398A1 publication Critical patent/EP0351398A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/8008—Component parts, details or accessories; Auxiliary operations specially adapted for winding and joining
    • B29C53/8016—Storing, feeding or applying winding materials, e.g. reels, thread guides, tensioners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/564—Winding and joining, e.g. winding spirally for making non-tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/347—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation combined with compressing after the winding of lay-ups having a non-circular cross-section, e.g. flat spiral windings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types

Definitions

  • This invention relates to a winding machine for use in the manufacture of hoop-wound fibre-reinforced resin structures of substantially laminar form. It is well known to lay fibre reinforcements in selected directions in the manufacture of resin articles in order to secure specifically orientated qualities in the resultant article. In particular, it is known to engender hoop stresses in a cylindrical article by the inclusion of hoop-wound fibres.
  • a hoop-wound cylinder is fairly simply achieved by machines which rotate a cylindrical former about its own axis so as to cause a tow of resin-wetted fibres to be drawn onto its circumference from a feed means having a laying-on head main ⁇ tained continguous with the circumference at the laying-on location so as to consolidate the fibres.
  • These machines rely upon the axial symmetry of the cylinder to ensure that the laying-on location remains at a constant radial distance from the axis of rotation.
  • a more complex system is required for the fabrica ⁇ tion of hoop-wound articles which are not axi-symmetric, in order to maintain the laying-on head constantly in contact with the periphery of the article.
  • Machines for fabricating flat panels, in which a resin-wetted fibre tow is wound onto a substantially laminar former, hereinafter referred to as a winding card. These normally operate on the principle of moving the laying-on head with respect to a fixed winding card, the laying-on head being mounted, together with a tow wetting means, on a carriage which runs on tracks surrounding the periphery of the card at a constant separation therefrom.
  • Such machines require computer control to ensure consistency of the various feed parameters which include, for example, tow tension, tow velocity (upon which depends the resin volume picked up by the tow as it is drawn through the wetting means), and consolidation of the laid-on tow.
  • the present invention seeks to provide a machine for rotating a winding card about an axis in the plane of the card in a manner permitting the laying-on head to be located at a fixed position with a minimal wetted tow length.
  • a filament winding machine for winding a resin- wetted fibre tow onto a substantially laminar winding card includes: a framework; a prime mover attached to the framework; a drive shaft journalled in the framework and driveable by the prime mover about a drive axis; a crank arm attached to the drive shaft so as to rotate therewith; a driven shaft journalled in the crank arm so as to be rotatable about a driven axis parallel with the drive axis and spaced therefrom by a crank length; a transmission mechanism coupled between the two said shafts, geared for rotating the driven shaft at half the speed of the drive shaft; a winding card securing means attached to the driven shaft and orientated so as to locate a median of the axial plane of the winding card in alignment with the driven axis, the winding card being selected to have a card length perpen ⁇ dicular to the said median which is four times greater than the crank length, thereby to provide that rotation of the drive shaft will cause the card length to describe a cardio
  • the transmission mechanism comprises: a drive sprocket centred on the drive axis and fixed to the framework; a driven sprocket centred on the driven axis and attached to the driven shaft, the driven sprocket being selected to have twice the diameter of the drive sprocket; and a continuous toothed drive belt or drive chain engaged between the drive sprocket and the driven sprocket.
  • Figure 3 is an enlarged part-section taken on line III-III of Figure 1 ,
  • Figure 4 is a diagrammatic representation of Figure 2 showing two distinct positions of the winding card
  • Figure 5 is a plot of the locus of the winding card through 180° of revolution, as seen from the same viewpoint as Figure 4 and indicating the location of the feed means.
  • the winding machine illustrated in Figures 1 and 2 comprises a framework 1 supporting a prime mover 2 and a pair of bearings 3 disposed in alignment on a drive axis A.
  • a hollow drive shaft 4, externally journalled in the bearings 3, carries a crank plate 5 and a toothed drive ring 6 which is engaged with the prime mover 2 by a drive chain 7 ( Figure 2).
  • the drive shaft 4 and the crank plate 5 are depicted in section i n Figure 3 > revealing a fixed shaft 10 extending co-axially through the hollow drive shaft 4, which shaft 10 is secured at one end to the framework 1 by a clamp 11.
  • the shaft 10 is maintained co-axial with the shaft 4 by a bearing sleeve 12 and extends through a clearance hole 13 in the crank plate 5 to support a drive sprocket 14 rigidly attached to the emergent end.
  • crank plate 5 extends through equal radii on either side of the drive axis A, one radius bearing a counterweight 15 and the opposing radius being provided with a drive belt cover plate 16, which plate together with the confronting portion of the crank plate 5 comprises the crank arm 17.
  • a driven shaft 20 is journalled in a pair of bushes 19 located in the crank arm 17 and centred on a driven axis B parallel with and separated from the axis A by a crank length L.
  • Attached to the shaft 20 interjacent the plates 5 and 16 is a driven sprocket 21 having a 2:1 relationship with the drive sprocket 14, with which it is coupled by a toothed drive belt 22.
  • the driven shaft 20 supports a socket 23 comprising the winding card securing means, a winding card 24 of card length 4L being provided with a centrally disposed mandrel 25 which is located in the socket 23 and held therein by a transverse locking pin 26.
  • rotation of the drive shaft 4 causes the crank arm 17 to rotate about the drive axis, thereby tracking the drive belt 22 around the fixed drive sprocket 14. This movement of the belt 22 consequently causes the driven sprocket 21 to rotate the driven shaft 20 at half the speed of the drive shaft 4.
  • Figure 4 illustrates two positions ⁇ f the winding card 24 and 24', one (24) being that shown in Figure 2 and the other (24') occurring when the crank length L has rotated counter-clockwise (as drawn) through an angle 2a.
  • the axial plane 30 of the winding card has been rotated through an angle a. Consequently the winding card will be rotated through 180° for every complete revolution of the drive ring 6.
  • FIG. 5 A fuller plot of the winding card positions obtained for one complete revolution of the crank arm 17 about the axis A appears in Figure 5, from which it will be readily seen that the perimetric curve of the locus of the card is equivalent to that followed by a point on the circumference of a circle having a diameter 2 L when rolled around another circle of equal diameter, ie a cardioid.
  • the cardiod has a cusp 31 situated at the axis B where the crank length L Is perpendicular to the axial plane 30 of the card.
  • a suitable feed means 33 includes the laying-on head 32 com ⁇ prised in this embodiment by a leaf spring adjacent the winding card at the cusp 31, a feed eye 41, wetting-out rollers 42 supplied with resin from a resin pump 43, and a tow of fibres 44 which is drawn from a fibre creel 45 through the rollers 42, the eye 41 and the leaf spring 32 by the rotation of the winding card 24.
  • the feed means 33 may be extended to comprise a multiple array perpendicular to the plane of Figure 5 so as to lay parallel tows simultaneously over the full width of the winding card.
  • the single head 32 and the eye 41 may be traversed perpen ⁇ dicularly to the said plane by appropriate drive means (not shown).
  • the manner in which the winding card always presents itself to the laying-on head is advantageous not only in permitting a fixed location of the head, but also in reducing to a minimum the feed length of wetted tow, ie the distance of the wetting-out rollers from the winding card. Further advantage lies in the simple mechanical synchronization of the card and the crank, ensuring reliability and consistency throughout the winding process.
  • the cardioid rotation of the winding card causes sinusoidal variation of the tow velocity.
  • the amplitude of this variation is however 50% less than would be obtained by simple circular rotation of the card about its own axis. If desired, these sinusoidal variations can be reduced still further to provide a constant tow velocity by appropriate control of the speed of the prime mover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Une bobineuse servant à enrouler une étoupe de fibres (44) imprégnées de résine sur une carde d'enroulement laminaire (24) est conçue pour faire tourner la carde autour d'un axe (B) reposant dans son propre plan, de façon à décrire un lieu cardioïde ayant un sommet de courbe (31) à travers lequel passe chaque point sur la surface de la carde, ce qui permet à une tête de pose (32) de l'étoupe d'être placée à une position fixe adjacente au sommet de la courbe. La bobineuse a l'avantage de produire une longueur d'étoupe imprégnée minimale entre la tête de pose et son organe d'avance (33) qui, en conjonction avec une synchronisation mécanique simple dudit organe, assure des caractéristiques d'enroulement fiables et constantes.A winder for winding a tow of resin impregnated fibers (44) on a laminar winding card (24) is designed to rotate the card about an axis (B) lying in its own plane, so as to describe a cardioid location having a curve apex (31) through which each point on the surface of the card passes, allowing a packing head (32) to be placed in a fixed position adjacent to the apex of the curve. The winder has the advantage of producing a minimum impregnated tow length between the laying head and its feed member (33) which, in conjunction with simple mechanical synchronization of said member, ensures reliable and constant winding characteristics. .

Description

FILAMENT WINDING MACHINE
This invention relates to a winding machine for use in the manufacture of hoop-wound fibre-reinforced resin structures of substantially laminar form. It is well known to lay fibre reinforcements in selected directions in the manufacture of resin articles in order to secure specifically orientated qualities in the resultant article. In particular, it is known to engender hoop stresses in a cylindrical article by the inclusion of hoop-wound fibres. The manufacture of a hoop-wound cylinder is fairly simply achieved by machines which rotate a cylindrical former about its own axis so as to cause a tow of resin-wetted fibres to be drawn onto its circumference from a feed means having a laying-on head main¬ tained continguous with the circumference at the laying-on location so as to consolidate the fibres. These machines rely upon the axial symmetry of the cylinder to ensure that the laying-on location remains at a constant radial distance from the axis of rotation. Obviously, a more complex system is required for the fabrica¬ tion of hoop-wound articles which are not axi-symmetric, in order to maintain the laying-on head constantly in contact with the periphery of the article.
Machines are known for fabricating flat panels, in which a resin-wetted fibre tow is wound onto a substantially laminar former, hereinafter referred to as a winding card. These normally operate on the principle of moving the laying-on head with respect to a fixed winding card, the laying-on head being mounted, together with a tow wetting means, on a carriage which runs on tracks surrounding the periphery of the card at a constant separation therefrom. Such machines require computer control to ensure consistency of the various feed parameters which include, for example, tow tension, tow velocity (upon which depends the resin volume picked up by the tow as it is drawn through the wetting means), and consolidation of the laid-on tow.
It is also known to rotate a winding card about an axis lying in its own plane whilst applying the fibre tow from a laying-on head located on an articulated robot arm having complex computer control for following the periphery of the card, the wetting means being located at the fixed end of the arm. A disadvantage of this system is the long linkage length necessary between the moving and fixed ends of the arm, particularly when the length of the card, ie the diameter of the rotation locus, is great. The correspondingly long length of wetted tow that must therefore be drawn through the various rollers of the arm increases the risk of fouling.
The present invention seeks to provide a machine for rotating a winding card about an axis in the plane of the card in a manner permitting the laying-on head to be located at a fixed position with a minimal wetted tow length.
Accordingly, a filament winding machine for winding a resin- wetted fibre tow onto a substantially laminar winding card includes: a framework; a prime mover attached to the framework; a drive shaft journalled in the framework and driveable by the prime mover about a drive axis; a crank arm attached to the drive shaft so as to rotate therewith; a driven shaft journalled in the crank arm so as to be rotatable about a driven axis parallel with the drive axis and spaced therefrom by a crank length; a transmission mechanism coupled between the two said shafts, geared for rotating the driven shaft at half the speed of the drive shaft; a winding card securing means attached to the driven shaft and orientated so as to locate a median of the axial plane of the winding card in alignment with the driven axis, the winding card being selected to have a card length perpen¬ dicular to the said median which is four times greater than the crank length, thereby to provide that rotation of the drive shaft will cause the card length to describe a cardioid locus in a plane perpendicular to the drive axis, the cardiod having a cusp located at the orthogonally occurring intersection of the crank length with the card length; which machine further includes a resin-wetted tow feed means located outwardly of the cardiod locus adjacent the cusp.
Preferably the transmission mechanism comprises: a drive sprocket centred on the drive axis and fixed to the framework; a driven sprocket centred on the driven axis and attached to the driven shaft, the driven sprocket being selected to have twice the diameter of the drive sprocket; and a continuous toothed drive belt or drive chain engaged between the drive sprocket and the driven sprocket.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings of which Figures 1 and 2 are side and front elevations respectively of a filament winding machine fitted with a winding-card,
Figure 3 is an enlarged part-section taken on line III-III of Figure 1 ,
Figure 4 is a diagrammatic representation of Figure 2 showing two distinct positions of the winding card, and Figure 5 is a plot of the locus of the winding card through 180° of revolution, as seen from the same viewpoint as Figure 4 and indicating the location of the feed means.
The winding machine illustrated in Figures 1 and 2 comprises a framework 1 supporting a prime mover 2 and a pair of bearings 3 disposed in alignment on a drive axis A. A hollow drive shaft 4, externally journalled in the bearings 3, carries a crank plate 5 and a toothed drive ring 6 which is engaged with the prime mover 2 by a drive chain 7 (Figure 2).
The drive shaft 4 and the crank plate 5 are depicted in section in Figure 3> revealing a fixed shaft 10 extending co-axially through the hollow drive shaft 4, which shaft 10 is secured at one end to the framework 1 by a clamp 11. The shaft 10 is maintained co-axial with the shaft 4 by a bearing sleeve 12 and extends through a clearance hole 13 in the crank plate 5 to support a drive sprocket 14 rigidly attached to the emergent end.
The crank plate 5 extends through equal radii on either side of the drive axis A, one radius bearing a counterweight 15 and the opposing radius being provided with a drive belt cover plate 16, which plate together with the confronting portion of the crank plate 5 comprises the crank arm 17.
A driven shaft 20 is journalled in a pair of bushes 19 located in the crank arm 17 and centred on a driven axis B parallel with and separated from the axis A by a crank length L. Attached to the shaft 20 interjacent the plates 5 and 16 is a driven sprocket 21 having a 2:1 relationship with the drive sprocket 14, with which it is coupled by a toothed drive belt 22.
The driven shaft 20 supports a socket 23 comprising the winding card securing means, a winding card 24 of card length 4L being provided with a centrally disposed mandrel 25 which is located in the socket 23 and held therein by a transverse locking pin 26. In use, rotation of the drive shaft 4 causes the crank arm 17 to rotate about the drive axis, thereby tracking the drive belt 22 around the fixed drive sprocket 14. This movement of the belt 22 consequently causes the driven sprocket 21 to rotate the driven shaft 20 at half the speed of the drive shaft 4.
Figure 4 illustrates two positions ϋf the winding card 24 and 24', one (24) being that shown in Figure 2 and the other (24') occurring when the crank length L has rotated counter-clockwise (as drawn) through an angle 2a. At this second position, the axial plane 30 of the winding card has been rotated through an angle a. Consequently the winding card will be rotated through 180° for every complete revolution of the drive ring 6.
A fuller plot of the winding card positions obtained for one complete revolution of the crank arm 17 about the axis A appears in Figure 5, from which it will be readily seen that the perimetric curve of the locus of the card is equivalent to that followed by a point on the circumference of a circle having a diameter 2 L when rolled around another circle of equal diameter, ie a cardioid. The cardiod has a cusp 31 situated at the axis B where the crank length L Is perpendicular to the axial plane 30 of the card.
The particular advantage of this locus Is that all points on the surface of the winding card must process through the cusp 31 , which cusp thus defines a fixed location adjacent which a laying-on head 32 of a resin-wetted fibre feed means 33 can be sited. With an infinitely thin winding card this procession would occur through a single spatial point, which spreads into a circle of increasing diameter as card thickness is increased. When the ratio of card length to card thickness is great, as in the case of a beam-like structure, the spread of the point is of no great significance. A suitable feed means 33 includes the laying-on head 32 com¬ prised in this embodiment by a leaf spring adjacent the winding card at the cusp 31, a feed eye 41, wetting-out rollers 42 supplied with resin from a resin pump 43, and a tow of fibres 44 which is drawn from a fibre creel 45 through the rollers 42, the eye 41 and the leaf spring 32 by the rotation of the winding card 24.
Compensation for any significant spread of the cusp point which occurs when thick winding cards are wound may be achieved by mount¬ ing the head 32 on a cam-follower (not shown). The feed means 33 may be extended to comprise a multiple array perpendicular to the plane of Figure 5 so as to lay parallel tows simultaneously over the full width of the winding card. Alter¬ natively, the single head 32 and the eye 41 may be traversed perpen¬ dicularly to the said plane by appropriate drive means (not shown). The manner in which the winding card always presents itself to the laying-on head is advantageous not only in permitting a fixed location of the head, but also in reducing to a minimum the feed length of wetted tow, ie the distance of the wetting-out rollers from the winding card. Further advantage lies in the simple mechanical synchronization of the card and the crank, ensuring reliability and consistency throughout the winding process.
The cardioid rotation of the winding card causes sinusoidal variation of the tow velocity. The amplitude of this variation is however 50% less than would be obtained by simple circular rotation of the card about its own axis. If desired, these sinusoidal variations can be reduced still further to provide a constant tow velocity by appropriate control of the speed of the prime mover.

Claims

1. A filament winding machine for winding a resin-wetted fibre tow (44) onto a substantially laminar winding card (24) including: a framework (1) ; a prime mover (2) attached to the framework; a drive shaft (4) journalled in the framework and driveable by the prime mover about a drive axis (A);&crank arm (17) attached to the drive shaft (4) so as to rotate therewith; characterised by a driven shaft (20) journalled in the crank arm (17) so as to be rotatable about a driven axis (B) parallel with the drive axis (A) and spaced therefrom by a crank length (L) ; a transmission mechanism (14, 21, 22) coupled between the two said shafts, geared for rotating the driven shaft at half the speed of the drive shaft; a winding card securing means (23) attached to the driven shaft (20) and orientated so as to locate a median of the axial plane of the winding card in alignment with the driven axis (B) , the winding card being selected to have a card length perpendicular to the said median which is four times greater than the crank length (L) , thereby to provide that rotation of the drive shaft will cause the card length to describe a cardioid locus in a plane perpendicular to the drive axis, the cardioid having a cusp (31) located at the orthogonally occurring intersection of the crank length with the card length; said machine further including a resin-wetted tow feed means (33) located outwardly of the cardioid locus adjacent the cusp (31).
2. A filament winding machine as claimed in Claim 1 wherein the transmission mechanism is characterised by a drive sprocket (14) centred on the drive axis (A) and fixed to the framework (1); a driven sprocket (14) centred on the driven axis (B) and attached to the driven shaft (20) , the driven sprocket being selected to have twice the diameter of the drive sprocket; and a continuous toothed drive belt (22) or chain engaged between the drive sprocket and the driven sprocket.
EP19870901573 1987-03-06 1987-03-06 Filament winding machine Ceased EP0351398A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1987/000158 WO1988006516A1 (en) 1987-03-06 1987-03-06 Filament winding machine

Publications (1)

Publication Number Publication Date
EP0351398A1 true EP0351398A1 (en) 1990-01-24

Family

ID=10610296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870901573 Ceased EP0351398A1 (en) 1987-03-06 1987-03-06 Filament winding machine

Country Status (2)

Country Link
EP (1) EP0351398A1 (en)
WO (1) WO1988006516A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6413503B1 (en) 1999-06-18 2002-07-02 Basf Aktiengesellschaft Use of cyclic enamines as light protection agents
US7423469B2 (en) 2004-06-12 2008-09-09 Texas Instruments Incorporated Triangulating phase interpolator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR921592A (en) * 1944-09-29 1947-05-12 Materials for the preparation in sheets of filiform or fibrous reinforcements intended to receive plastic impregnations
DE871785C (en) * 1951-03-08 1953-03-26 Licentia Gmbh Device for the machine winding of template coils for electrotechnical purposes
AT316132B (en) * 1969-06-06 1974-06-25 Florjancic Peter Device for the production of a link chain
FR2466852A1 (en) * 1979-10-05 1981-04-10 Videon Sa Adjustable movement transmission coil winding machine - has wire-guide, orbiting around moving core and tracking square with rounded corners w.r.t. point on core axis
DE3109365C2 (en) * 1981-03-12 1984-09-20 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Device for winding preferably non-rotationally symmetrical components made of fiber-reinforced materials

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8806516A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6413503B1 (en) 1999-06-18 2002-07-02 Basf Aktiengesellschaft Use of cyclic enamines as light protection agents
US6603014B1 (en) 1999-06-18 2003-08-05 Basf Aktiengesellschaft Use of cyclic enamines as light protection agents
US7423469B2 (en) 2004-06-12 2008-09-09 Texas Instruments Incorporated Triangulating phase interpolator

Also Published As

Publication number Publication date
WO1988006516A1 (en) 1988-09-07

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