EP0402782B1 - Disque de friction - Google Patents
Disque de friction Download PDFInfo
- Publication number
- EP0402782B1 EP0402782B1 EP90110857A EP90110857A EP0402782B1 EP 0402782 B1 EP0402782 B1 EP 0402782B1 EP 90110857 A EP90110857 A EP 90110857A EP 90110857 A EP90110857 A EP 90110857A EP 0402782 B1 EP0402782 B1 EP 0402782B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- zone
- friction
- curvature
- thread
- friction coefficient
- 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 - Lifetime
Links
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 9
- 241001589086 Bellapiscis medius Species 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000011089 mechanical engineering Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
- D02G1/04—Devices for imparting false twist
- D02G1/08—Rollers or other friction causing elements
- D02G1/082—Rollers or other friction causing elements with the periphery of at least one disc
Definitions
- the invention relates to a friction disk according to the preamble of claim 1.
- the object of the invention is to avoid this disadvantage.
- the invention also divides the friction disk into zones, of which one zone performs the functions of twisting and conveying and the other zone performs the function of optimal thread guidance.
- the zones for swirling and conveying on the one hand and the thread guide on the other hand are designed in such a way that the conveying effect is not impaired.
- This precisely defined division of the zones can on the one hand result in an optimal friction effect and on the other hand an optimal thread guidance.
- the thickness of the friction disks is limited to values that have previously been customary and are acceptable in mechanical engineering.
- the friction false twister has three shafts 1, 2, 3, which are rotatably mounted in the base plate 4.
- the waves are supported on the corners of an equilateral triangle.
- the shafts are driven by a tangential belt 6 running in the machine length, which abuts a whorl 5.
- the whorl 5 is attached to the shaft 1.
- From the shaft 1, the other shafts 2 and 3 are driven in the same direction via pulleys 7 and 8 and small drive belts.
- three friction disks 11, 12, 13 are mounted on the shafts 1, 2, 3 in such a way that they overlap in an overlap region 14.
- the overlap region 14 lies over the center of the equilateral triangle, on the corner points of which the shafts 1, 2, 3 are mounted.
- the base plate 4 has an insertion slot 9 which projects into the central overlap region 14 of the disks.
- the friction disks 12 and 13 form a gusset 10 into which the thread is inserted so that it reaches the overlap area 14.
- the formation of the new friction disks 11, 12, 13 results from FIGS. 3 and 5.
- a known friction disk is shown in FIG. 7.
- the friction disks have a spherical circumferential surface over which the thread 15 runs.
- the thread 15 partially wraps around the spherical peripheral surface.
- the wrap area is designated with UIV or UVI or UVIII.
- the geometry of the friction false twister results in a thread guide in which the thread is inclined to the tangent over the circumference of the disc.
- the angle of inclination alpha denotes the complement angle to the angle between the thread and the circumferential tangent. In the static state, this angle of inclination alpha is constant over the entire wrap area U.
- FIGS. 4A, 6A, 8A a development of the circumference is shown in FIGS. 4A, 6A, 8A. This development represents the spherical circumference of the friction disk linearly both in the circumferential direction and in the axial direction.
- the new friction disks according to FIGS. 3 and 5 now consist of zones with different coefficients of friction, namely a zone 16 with high friction, hereinafter referred to as “friction zone”, and a zone 17 with low friction, hereinafter referred to as “guide zone”.
- the friction zone has e.g. compared to the thread a coefficient of friction of 0.25 and the guide zone a coefficient of friction of 0.1.
- the friction zone has a larger radius of curvature than the guide zone.
- the coefficient of friction there is a direct relationship between the coefficient of friction and the radius of curvature. That means: the greater the coefficient of friction, the greater the radius of curvature.
- the decisive factor is rather the following: The disc becomes very thick due to a large radius of curvature. This is undesirable in mechanical engineering.
- the contact distance cannot be as short as desired, since this would lead to impermissible surface pressures between the thread and the friction disk. Surface pressures are to be kept particularly low if the friction disc has a high coefficient of friction.
- the radius of curvature of the friction disc which determines the length of the contact distance in the friction zone, should therefore be designed according to the permissible surface pressure.
- the permissible surface pressure can only result from tests and experience and is very much dependent on the material on the one hand the friction surface and on the other hand the thread.
- the radius of curvature of the guide zone is chosen to be as small as is expedient in mechanical engineering in order to achieve a small disk thickness and for thread guidance.
- the radius of curvature of the friction zone can e.g. 7 mm, the guide zone is 2 mm.
- the zones of different friction can now be arranged in a different order in the thread running direction.
- the friction zone 16 is located at the entrance and the guide zone 17 is located at the exit of the friction disk.
- the development of the circumference of the friction disk results in the following picture:
- the thread first runs onto the friction disk at an angle of inclination alpha, specifically into the friction zone 16, which is essentially due to the geometrical design of the friction false twister and the resulting thread guide is due.
- the thread is then very heavily carried over through the friction zone in the sense of a reduction in the angle of inclination alpha. Therefore, the movement component of the circumferential speed of the friction disk, which points in the direction of the thread axis, which is therefore effective in conveying, becomes smaller and smaller.
- the angle of inclination alpha goes to zero.
- the length of the friction zone 16 is limited.
- the friction zone 16 Before the angle of inclination alpha approaches zero, the friction zone 16 is followed by the guide zone 17, which has only a small amount of friction. However, the thread carryover is in the low friction zone low. Therefore, there is no further decrease in the angle of inclination alpha.
- the arrangement of the guide zone thus causes the thread to leave the friction zone at a minimum angle alpha and is therefore always exposed to a positive, but in no case a negative, conveying effect.
- the thread tension diagram of FIG. 4B shows the effect on the thread tension.
- the decrease in the thread tension does not continue, since the angle of inclination alpha and thus the conveying effect of the friction disc is reduced.
- the thread tension remains essentially constant.
- FIGS. 7 and 8 A friction disk of the prior art is now shown in FIGS. 7 and 8.
- the wrap-around area UVIII is equipped with a uniform coefficient of friction. This means that at the beginning - as shown in FIG. 8B - the thread tension of the friction zone also decreases. Subsequently, however, the angle of inclination changes so decisively that the thread tension increases again. When the thread leaves the friction disc, the thread tension is higher than in the entrance of the friction disc. This shows that the delivery effect at the exit of the friction disc is negative.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Braking Arrangements (AREA)
Claims (7)
- Disque de friction (11) pour la fausse torsion d'un fil synthétique (15), le disque (11) étant entraîné en rotation et présentant, sur son pourtour, une surface de friction incurvée sur laquelle le fil (15) passe transversalement à la direction périphérique, le disque de friction (11) présentant une zone (16) avec un rayon de courbure plus grand et un coefficient de friction plus élevé et une zone (17) avec un rayon de courbure plus petit et un coefficient de friction plus faible, les deux zones formant l'ensemble de la surface périphérique se trouvant en contact avec le fil,
caractérisé par le fait que
la zone (16) ayant le coefficient de friction plus élevé présente un rayon de courbure exclusivement plus grand. - Disque de friction suivant la revendication 1,
caractérisé par le fait
que le coefficient de friction plus élevé s'élève à environ 0,25 et le coefficient de friction plus faible à environ 0,1. - Disque de friction suivant l'une des revendications 1 ou 2,
caractérisé par le fait
que le rayon de courbure de la zone (16) à coefficient de friction plus élevé est d'environ 7 mm et le rayon de courbure de la zone (17) à coefficient de friction plus faible est d'environ 2 mm. - Disque de friction suivant l'une des revendications 1 à 3,
caractérisé par le fait que
la zone (17) à coefficient de friction plus faible se trouve, dans le sens de déplacement du fil, en avant de la zone (16) à coefficient de friction plus élevé. - Dispositif pour la fausse torsion d'un fil (15), comprenant une plaque de fixation (4) et trois arbres (1, 2, 3) qui sont montés en rotation autour d'axes parallèles sur la plaque de fixation (4) en étant situés aux angles d'un polygone équilatéral dont le nombre de côtés est égal au nombre des arbres, une pluralité de disques circulaires (11, 12, 13) fixés sur chaque arbre de telle manière que les zones marginales des disques se chevauchent en un point situé au milieu entre les arbres et forment entre elles un trajet de mouvement pour le fil, et un dispositif d'entraînement pour la rotation simultanée des disques dans le même sens, chaque disque (11, 12, 13) présentant un corps circulaire disposé coaxialement à l'axe de rotation de l'arbre associé et portant sur son pourtour une surface de friction sur laquelle le fil passe transversalement à la direction périphérique, et la surface de friction présentant axialement côte à côte une première zone (16) à coefficient de friction plus élevé et à rayon de courbure plus grand et une deuxième zone (17) à coefficient de friction plus faible et à rayon de courbure plus petit,
caractérisé par le fait que
la zone (16) à coefficient de friction plus élevé présente un rayon de courbure exclusivement plus grand, et que les deux zones forment l'ensemble de la surface périphérique en contact avec le filé. - Dispositif suivant la revendication 5,
caractérisé par le fait que
la deuxième zone (17) est située dans le sens de déplacement du fil en avant de la première zone (16). - Dispositif suivant la revendication 5 ou 6,
caractérisé par le fait que
le rayon de courbure de la première zone (16) s'élève à environ 7 mm et le rayon de courbure de la deuxième zone (17) à environ 2 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3919395 | 1989-06-14 | ||
DE3919395 | 1989-06-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0402782A2 EP0402782A2 (fr) | 1990-12-19 |
EP0402782A3 EP0402782A3 (fr) | 1991-04-10 |
EP0402782B1 true EP0402782B1 (fr) | 1995-09-20 |
Family
ID=6382717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90110857A Expired - Lifetime EP0402782B1 (fr) | 1989-06-14 | 1990-06-08 | Disque de friction |
Country Status (3)
Country | Link |
---|---|
US (1) | US5349808A (fr) |
EP (1) | EP0402782B1 (fr) |
DE (1) | DE59009674D1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH683700A5 (de) * | 1991-06-21 | 1994-04-29 | Rieter Ag Maschf | Drallorgan für mechanisches Falschdrallspinnen. |
DE4401321A1 (de) * | 1994-01-18 | 1995-07-20 | Temco Textilmaschkomponent | Friktionsfalschdrallaggregat mit variabler Drehrichtung für S- bzw. Z-Drehung |
US20050019325A1 (en) * | 1996-01-08 | 2005-01-27 | Carter Paul J. | WSX receptor agonist antibodies |
EP0943022B1 (fr) | 1997-09-26 | 2001-12-12 | B a r m a g AG | Broche de fausse torsion |
DE19814921A1 (de) * | 1998-04-03 | 1999-10-07 | Temco Textilmaschkomponent | Geometrische Anordnung für eine Texturiervorrichtung |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1419085A (en) * | 1972-03-06 | 1975-12-24 | Scragg & Sons | Yarn processing |
DE2213881C3 (de) * | 1972-03-22 | 1978-11-30 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Friktions-Falschdrallvorrichtung |
CH564619A5 (fr) * | 1973-02-12 | 1975-07-31 | Kugelfischer G Schaefer & Co | |
DE2306853B2 (de) * | 1973-02-12 | 1975-06-12 | Kugelfischer Georg Schaefer & Co, 8720 Schweinfurt | Reibscheibe |
CH584780A5 (fr) * | 1974-06-12 | 1977-02-15 | Kugelfischer G Schaefer & Co | |
DE2518538B1 (de) * | 1975-04-25 | 1976-01-29 | Kugelfischer G Schaefer & Co | Reibscheibe |
US4051655A (en) * | 1975-07-30 | 1977-10-04 | Barmag Barmer Maschinenfabrik Aktiengesellschaft | Friction false twister |
DE7623421U1 (de) * | 1976-07-24 | 1977-04-07 | Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal | Friktionsfalschdraller |
JPS5361748A (en) * | 1976-11-12 | 1978-06-02 | Teijin Ltd | Friction falseetwisting apparatus |
DE2708204C2 (de) * | 1977-02-25 | 1979-04-05 | Feldmuehle Ag, 4000 Duesseldorf | Falschdrallvorrichtung |
US4218870A (en) * | 1978-12-18 | 1980-08-26 | Milliken Research Corporation | False twist machine |
DE3126726C2 (de) * | 1980-07-16 | 1987-02-26 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Reibscheibe |
DE8532434U1 (de) * | 1985-11-16 | 1986-01-02 | FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt | Reibrotor zum Falschdrallen von synthetischen Fäden |
-
1990
- 1990-06-01 US US07/531,894 patent/US5349808A/en not_active Expired - Fee Related
- 1990-06-08 DE DE59009674T patent/DE59009674D1/de not_active Expired - Fee Related
- 1990-06-08 EP EP90110857A patent/EP0402782B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0402782A2 (fr) | 1990-12-19 |
US5349808A (en) | 1994-09-27 |
EP0402782A3 (fr) | 1991-04-10 |
DE59009674D1 (de) | 1995-10-26 |
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