EP0710301A1 - Spinnvorrichtung und steuer- sowie regeleinrichtung für die spinnvorrichtung - Google Patents
Spinnvorrichtung und steuer- sowie regeleinrichtung für die spinnvorrichtungInfo
- Publication number
- EP0710301A1 EP0710301A1 EP94918737A EP94918737A EP0710301A1 EP 0710301 A1 EP0710301 A1 EP 0710301A1 EP 94918737 A EP94918737 A EP 94918737A EP 94918737 A EP94918737 A EP 94918737A EP 0710301 A1 EP0710301 A1 EP 0710301A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- rotationally symmetrical
- spinning device
- symmetrical element
- spindle
- 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.)
- Granted
Links
- 238000009987 spinning Methods 0.000 title claims abstract description 60
- 230000001105 regulatory effect Effects 0.000 title description 4
- 230000005291 magnetic effect Effects 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000013016 damping Methods 0.000 description 4
- 239000003302 ferromagnetic material Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007378 ring spinning Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 206010020112 Hirsutism Diseases 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
- D01H7/02—Spinning or twisting arrangements for imparting permanent twist
- D01H7/66—Cap arrangements
- D01H7/68—Cap constructions
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/14—Details
- D01H1/42—Guards or protectors for yarns or threads, e.g. separator plates, anti-ballooning devices
- D01H1/427—Anti-ballooning cylinders, e.g. for two-for-one twist machine
Definitions
- the invention relates to a spinning device with a spool fastened to a rotatable spindle for receiving the thread, with a thread guide, which detects the incoming thread and is arranged centrally to the spool, with a freely floating, magnetically supported, concentrically surrounding the spool.
- the invention further relates to a control and regulating device for such a spinning device.
- the spinning device of the type mentioned is known from DE-OS 41 03 369.
- the thread is guided inside in the spinning or twisting ring, so that it also serves as a balloon limiter.
- an eyelet-like thread guide is provided in the area of the lower front end, which can be an inwardly projecting component.
- the spinning or twisting ring extends over a greater axial length of the coil. stretches and is kept floating for stabilization over two axially spaced magnetic bearings, both magnetic bearings being radially active magnetic bearings.
- the object of the invention further relates to a control device and a regulating device which allow the advantages of the spinning device according to the invention to be optimally used.
- the rotationally symmetrical element is tubular and is provided with an inwardly directed collar on the end face facing the incoming thread outside the area of the bobbin, is held on its part surrounding the spool by means of a radially active, axially passive magnetic bearing surrounding the element and is held on the collar on the end facing the incoming thread by means of a radially stable, axially unstable magnetic bearing.
- the radially active, axially passive magnetic bearing which comprises the rotationally symmetrical element at its lower part, can be, for example, a magnetic bearing which axially magnetizes the element, which at least partially consists of ferromagnetic material, in its axial direction by means of a surrounding element
- the radially stable, axially unstable magnetic bearing can consist of two ring-shaped permanent magnets arranged concentrically to the axis of the coil, one of which is attached to the collar and thus rotates with the element and the other, opposite the first, is fixed from the outside is appropriate.
- the rotationally symmetrical element is thus suspended in the axial direction in the axially unstable magnetic bearing. It gets its axial stability from the interaction of the two magnetic bearings.
- the sensors for detecting the axial deviations of the rotationally symmetrical element are used in conjunction with the downstream electronic device to measure the thread tension.
- the collar on the upper part of the rotationally symmetrical element serves on the one hand to attach the upper magnetic bearing, but also leads to a calming of the air circulation in the interior of the element, which has an energy-saving effect.
- the energy-saving effect is further increased in a very advantageous embodiment of the spinning device, in which the thread facing the incoming thread
- the end of the rotationally symmetrical element is closed by the collar except for a central, round recess forming the thread guide arranged centrally to the bobbin.
- the centrally arranged thread guide is formed by the central recess and therefore rotates with the element. The friction of the thread on the thread guide, as occurs when the thread guide is stationary, and which does not only have a negative effect on the winding process, but also on the process of
- the rotationally symmetrical element which tapers upwards, is conical.
- the aim is to
- the resulting smaller, average diameter of the element has an energy-saving effect due to the lower moment of inertia.
- a very advantageous embodiment of the spinning device is designed according to claim 4 such that the axial relative movement between the rotationally symmetrical element and the spindle takes place in such a way that the spindle is pushed into the rotationally symmetrical element when the yarn is being wound up.
- the winding process begins at the lower part of the spool, and the element and the spool move in such a way that the winding process continues upwards.
- the coil that grows is located outside the rotationally symmetrical element, which has the consequence that the aerodynamic losses increase sharply with increasing length and diameter of the coil.
- the coil that increases in diameter and length during the winding process is formed within the rotationally symmetrical element. Since the element and coil rotate in the same direction of rotation at almost the same speed the aerodynamic losses of the coil - compared to the usual transport movement of the coil and element during the winding process - kept small.
- the protective tube is also provided on the end face facing the incoming thread with an inwardly directed collar to which the radially stable, axially unstable magnetic bearing is fastened.
- the air gap between the rotationally symmetrical element and the protective tube has a width of no more than 2-10 mm.
- a version in which a connecting piece for a suction device is attached to the protective tube serves to further reduce air friction. By generating negative pressure in the space between the element and the protective tube, the air friction losses are further reduced.
- an embodiment has proven to be expedient in which a tube extending between the thread guides and arranged on the inner wall of the element is provided for receiving the thread guided within the element. This embodiment enables the yarn end to be sucked through the tube to facilitate the piecing process. It goes without saying that the rotationally symmetrical element, which additionally has the tube, must be balanced.
- an embodiment can be used in which the thread guide arranged on the rotationally symmetrical element and leading the thread to the bobbin is designed as a runner running around the inner circumference of the element.
- This embodiment is particularly suitable for measuring the thread tension by means of the sensors and the downstream electronic device.
- a relative movement between the rotor and the rotationally symmetrical element only occurs during the piecing phase. Because of its low inertia, the rotor will follow the rotation of the driven part very quickly, however, at the same rotational speed of the two parts, they no longer move relative to the rotationally symmetrical element. The situation after the piecing phase is thus the same as with a thread guide fixedly arranged on the element, so that during the
- the longitudinal expansion of the rotationally symmetrical element makes it possible to provide it with an electric motor drive. Its sole use - and not also the drive of the spindle - is advantageous insofar as the spindle has a lower moment of inertia than the rotationally symmetrical element due to its smaller size and weight, so that the thread tension in the piecing phase is lower is than with the sole drive of the spindle.
- control device which has technical means for executing a program that takes into account the change in the thread tension that usually occurs during an operating cycle, the driving torques of the rotationally symmetrical element and the spindle are changed accordingly.
- the control program contains the knowledge obtained by means of the sensors for measuring the thread tension that is usually obtained during piecing and during the spinning phase (here, for example, due to the changing torque of the bobbin) changing thread tension forces which can be kept low by correspondingly changing the drive torques of the spindle and / or rotationally symmetrical element.
- the control device is expediently used in the same way as the control device in a spinning device in which both the spindle and the element have an electromotive drive. It is characterized by an electronic device which uses the measurement signals of the sensors for measuring the thread tension as a reference variable for stabilizing and possibly changing the thread tension and accordingly changes the drive torques of the spindle and / or the rotationally symmetrical element.
- Embodiments of the spinning device according to the invention are shown schematically in the drawing and explained in more detail below.
- FIG. 1 shows a spinning device with a magnetically mounted, rotationally symmetrical element and a co-rotating, centrally arranged thread guide
- Figure 2 shows a spinning device according to Figure 1 with protective tube
- FIG. 3 shows a spinning device with a magnetically mounted, rotationally symmetrical element with an inner tube
- FIG. 4 shows a spinning device with a rotationally symmetrical element made of steel which is adapted to the diameter of the spindle
- Figure 5 with a spinning device according to Figure 2
- FIG. 6 shows a spinning device with a measuring device for determining the thread tension (consisting of sensors and a downstream electronic device); 7 shows a spinning device according to FIG. 1 with an " electromotive drive of rotationally symmetrical element and spindle and protective tube and with a control device; FIG. 8 shows a spinning device according to FIG. 1 with an additional electromotive drive of the rotationally symmetrical element through the
- Electromagnet system of the radial stabilization device of the radially active magnetic bearing 9 shows a spinning device according to FIG. 1, in which the axial relative movement between the rotationally symmetrical element and the spindle takes place in such a way that the spindle is pushed into the element when the yarn is being wound up.
- the coil 2 attached to the spindle 1 is surrounded concentrically by the cup-shaped rotationally symmetrical element 3.
- the thread guide 4 which guides the thread 5 to the bobbin 2, is fastened to the lower, open end face of the pot 3.
- This thread guide can have the shape of a hook as a deflection eyelet or be a bore.
- the upper end face of the pot 3 is closed except for the central recess 6, which forms the centrally arranged thread guide.
- Spindle 1 is mounted in a foot bearing 7 arranged concentrically to the central axis and is provided with an electromotive drive 8.
- the pot (or the rotationally symmetrical element) 3 is magnetically supported freely floating without a drive: the lower, radially stable, axially unstable magnetic bearing 9 comprising the rotationally symmetrical element consists of electromagnetic means arranged in a ring around the element. These can be excited by means of an electronic control device (not shown in the drawing), which are connected to sensors that detect radial deviations of the rotationally symmetrical element.
- the rotationally symmetrical element consists in its lower part 10 of ferromagnetic material.
- the bearing stator unit is attached to the pot bench 11. This magnetic bearing corresponds to the storage described in DE-PS 24 20 825.
- the foot bearing 7 and the pot bench 11 (and thus the parts firmly connected to the pot bench) can be moved in the vertical direction.
- the upper magnetic bearing consists of the concentric
- Damping element 14 is arranged in the air gap between the magnets 12 and 13, which are preferably magnetized in the axial direction, and is firmly connected to the latter. Both (permanent magnet 13 and damping element 14) are connected via a mechanical connection (not shown in the drawing) to the lower magnetic bearing 9 or the pot bench 11.
- the so-called fuse 15 as the starting material for the spinning process, is transported from the drafting device 16 to the spinning zone 17 at a constant delivery speed.
- the spun material e.g. cotton
- the torque exerted by the rotating pot 3 on the yarn 5 (indicated by the arrow) effects the desired twisting of the fibers to form a solid yarn 5.
- This yarn is transferred to the axis of rotation by the yarn guide 6 rotating with the pot guided and moves in the interior of the pot to the deflection eyelet 4 (thread guide 4).
- the pot 3 is driven by thread forces which are transferred from the yarn piece between the bobbin 2 and the thread guide 4 to the pot.
- the speed of the pot adjusts itself automatically to the speed of the bobbin and is smaller than the speed of the bobbin or spindle due to the yarn transport.
- the speed difference increases with increasing delivery speed and decreases with increasing coil diameter.
- the yarn 5 is deposited on the bobbin in layers by controlled axial relative movement between the bobbin and the pot. This movement can take place, on the one hand, by axially moving the bearing stator 7 when the pot 3 is stationary, or by axially moving the pot bench 11 when the bearing pot 7 is at a standstill. Overlapping of the transport movements is also possible.
- the first variant is preferred because here the thread length between the rotating thread guide 6 and the fixed knitting 16 remains constant. In the two other variants, this thread length changes periodically, which results in undesirable periodic quality fluctuations in the thread.
- FIG. 2 shows an embodiment of the
- the protective tube 18 is designed as a closed housing that surrounds the pot on the outside. In addition to the protective function, it lowers the noise level and the air friction on the rotating pot. It can also be used in a variant not shown in the drawing to accommodate emergency running bearings for the pot 3.
- a tube 19 is attached to the inner wall of the rotationally symmetrical element 3, in which the
- the spindle 1 is driven by the electric motor 8, the thread guided in the wing 19 (tube 19) takes the pot 3 with it.
- This embodiment variant enables the yarn end to be sucked through the tube 19 to facilitate the piecing process.
- the collar at the upper end of the element 3 is directed upwards and forms the centrally arranged thread guide 6 with its upper end.
- the design of the upper magnetic bearing corresponds to the design according to FIG. 2.
- Figure 4 shows an embodiment of the spinning device in which the rotationally symmetrical
- Element 3 is approximated in its diameter to the diameter of the spindle 2.
- element 3 is made of steel, so that the separate permanent magnet 12 (which is replaced by the upper part of element 3) is omitted.
- the embodiment variant shown in FIG. 5 is based on the embodiment variants of the spinning device shown in FIG.
- an electromagnetic drive, the drive 20 is also provided for the rotationally symmetrical element 3, which for this reason consists entirely of ferromagnetic material. Both drives are operated via a common generator 21.
- the rotationally symmetrical element 3 is also a rotor for the electromagnetic drive stator 20.
- Such a magnetic bearing variant is in "K. Boden:” Wide-Gap, Electro-Permanent Magnetic Bearing System with Radial Transmission of Radial and Axial Forces "in “Magnetic Bearings”, Proc. of the First Boarding School. Sy p., ETH Zurich, 6-8. June 1988, ed. G. Schweitzer, pp. 41-52, Springer Verlag Berlin - Heidelberg 1989 ".
- One of the motors is a synchronous drive, the other an asynchronous drive, so that the speed difference required for winding the thread 5 onto the bobbin 2 can be set freely.
- the drive motor for the spindle 1 can also be omitted.
- the pot then rotates at a constant speed.
- the yarn thus undergoes a correspondingly even twist.
- the bobbin 2 is dragged along by the yarn and lags behind the pot 3.
- the thread forces during the piecing process are relatively small due to the relatively small moment of inertia of the spindle and the empty bobbin.
- a pipe socket 22 is shown on the protective tube 18 for connection to a pump.
- FIG. 6 shows the spinning device with a measuring device for determining the thread tension.
- This measuring device consists of sensors 23 for detection the axial deviations of the rotationally symmetrical element from its desired position and the connected electronic device 24.
- the sensors 23 are attached to an edge of the part 10 of the rotationally symmetrical element consisting of ferromagnetic material.
- the electronic device is part of the electronics of the magnetic bearing, which also uses the signals from the sensors 23.
- the bearing sensor system thus has a double function in this case.
- FIG. 7 shows the embodiment of the spinning device according to FIG. 5 additionally with the measuring device according to FIG. 6.
- the signals supplied by the sensors 23 are used and used in an electronic device 25, which is part of the measuring device but also a control device, as a reference variable for the control to minimize the thread tension by changing the drive torque of the drives 8 and / or 20 and thus of the spindle 1 and / or rotationally symmetrical element 3.
- FIG. 8 shows an embodiment of the
- Spinning device which - apart from the missing protective tube 18 - differs from the variant shown in FIG. 5 in that instead of the electronic drive 20 the magnetic bearing system forms the drive system.
- FIG. 9 shows an embodiment of the spinning device which differs from the variant shown in FIG. 1 by a different relative movement of rotationally symmetrical element 3 and spindle 1 differs during the winding process.
- the yarn is wound onto the spindle, beginning at its upper part, and the spindle is pushed into the rotationally symmetrical element.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4321757 | 1993-06-30 | ||
DE4321757 | 1993-06-30 | ||
DE4328710 | 1993-08-26 | ||
DE4328710 | 1993-08-26 | ||
PCT/DE1994/000729 WO1995001472A1 (de) | 1993-06-30 | 1994-06-24 | Spinnvorrichtung und steuer- sowie regeleinrichtung für die spinnvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0710301A1 true EP0710301A1 (de) | 1996-05-08 |
EP0710301B1 EP0710301B1 (de) | 1998-04-15 |
Family
ID=25927262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94918737A Expired - Lifetime EP0710301B1 (de) | 1993-06-30 | 1994-06-24 | Spinnvorrichtung und steuer- sowie regeleinrichtung für die spinnvorrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US5590515A (de) |
EP (1) | EP0710301B1 (de) |
JP (1) | JP3515574B2 (de) |
DE (2) | DE59405725D1 (de) |
WO (1) | WO1995001472A1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19601541A1 (de) * | 1995-01-27 | 1996-08-01 | Seiko Seiki Kk | In einer Vakuumumgebung einsetzbares Vertikaltransfersystem sowie dazugehöriges Absperrventilsystem |
WO1997032065A1 (de) * | 1996-02-28 | 1997-09-04 | Vyzkumny Ústav Bavlnár^¿Sky A.S. | Spindelspinn- oder spindelzwirnverfahren und die arbeitseinheit zur durchführung des verfahrens |
DE19637270A1 (de) * | 1996-09-13 | 1998-03-19 | Schlafhorst & Co W | Topfspinnvorrichtung |
DE10306475A1 (de) * | 2003-02-14 | 2004-08-26 | Deutsche Institute für Textil- und Faserforschung | Fadenführervorrichtung für Ringspindel |
CZ2003588A3 (en) * | 2003-02-28 | 2004-10-13 | Výzkumnýáústavábavlnářskýááa@Ás | Device for spinning or twisting loops |
DE102004029207A1 (de) * | 2003-07-22 | 2005-03-10 | Rieter Ag Maschf | Textilmaschine mit rotierenden Ringen und Hülsen |
CH697668B1 (de) * | 2004-09-23 | 2009-01-15 | Rieter Ag Maschf | Spindel mit Abschirmelement. |
CZ20041160A3 (cs) * | 2004-12-01 | 2006-07-12 | VÚB a. s. | Zarízení pro smyckové predení nebo skaní |
CZ306702B6 (cs) * | 2006-03-23 | 2017-05-17 | Technická univerzita v Liberci | Zařízení pro vřetenové předení nebo skaní |
JP5098428B2 (ja) * | 2007-05-11 | 2012-12-12 | 株式会社豊田自動織機 | 繊維束配列装置 |
DE102008029482A1 (de) | 2008-06-20 | 2009-12-24 | Schaeffler Kg | Magnetische Lagerung, insbesondere Lagerung einer Faden-führungsrolle |
JP5746069B2 (ja) * | 2012-02-22 | 2015-07-08 | 株式会社豊田自動織機 | リングを有する紡機 |
US11053752B2 (en) | 2018-01-29 | 2021-07-06 | Baker Hughes, A Ge Company, Llc | Coiled tubing power cable with varying inner diameter |
DE102021101435A1 (de) | 2021-01-22 | 2022-07-28 | Saurer Spinning Solutions Gmbh & Co. Kg | Spinneinrichtung mit schwebendem Spinnring und Ballonbegrenzerhülse |
RS65456B1 (sr) * | 2021-05-15 | 2024-05-31 | Sanko Tekstil Isletmeleri San Tic A S | Uređaj i postupak za predenje i upredanje vlaknastog materijala u okvire za prstenasto predenje ili prstenasto upredanje |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117409A (en) * | 1960-12-06 | 1964-01-14 | Shino Masakazu | Method and apparatus for spinning frame |
JPS5343215B2 (de) * | 1972-08-19 | 1978-11-17 | ||
DE2420825C3 (de) * | 1974-04-30 | 1980-04-17 | Padana Ag, Zug (Schweiz) | Magnetische Lagerung eines Rotors |
DE3400327A1 (de) * | 1984-01-07 | 1985-07-18 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach | Glockenspinnvorrichtung |
IT1221716B (it) * | 1987-08-10 | 1990-07-12 | Cerit Spa | Perfezionamenti ad un sistema di filatura a limitatore di ballon rotante |
DE3741432A1 (de) * | 1987-12-08 | 1989-06-22 | Zinser Textilmaschinen Gmbh | Spinnvorrichtung |
JPH03152222A (ja) * | 1989-11-10 | 1991-06-28 | Murata Mach Ltd | 精紡機 |
DE4103369A1 (de) * | 1990-03-03 | 1991-09-05 | Stahlecker Fritz | Magnetlagerung |
EP0447895B1 (de) * | 1990-03-22 | 1995-02-22 | Maschinenfabrik Rieter Ag | Einrichtung für die Begrenzung eines rotierenden Spinnballons und Verfahren zum Ansetzen oder Anspinnen eines Fadens |
CH681630A5 (de) * | 1990-05-22 | 1993-04-30 | Rieter Ag Maschf | |
DE4018541A1 (de) * | 1990-06-09 | 1991-12-12 | Stahlecker Fritz | Magnetlagerung fuer einen rotor |
-
1994
- 1994-06-24 EP EP94918737A patent/EP0710301B1/de not_active Expired - Lifetime
- 1994-06-24 WO PCT/DE1994/000729 patent/WO1995001472A1/de active IP Right Grant
- 1994-06-24 DE DE59405725T patent/DE59405725D1/de not_active Expired - Fee Related
- 1994-06-24 JP JP50321295A patent/JP3515574B2/ja not_active Expired - Fee Related
- 1994-06-29 DE DE4422420A patent/DE4422420C2/de not_active Expired - Fee Related
-
1995
- 1995-12-19 US US08/575,694 patent/US5590515A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9501472A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995001472A1 (de) | 1995-01-12 |
DE59405725D1 (de) | 1998-05-20 |
US5590515A (en) | 1997-01-07 |
JP3515574B2 (ja) | 2004-04-05 |
DE4422420C2 (de) | 1997-01-09 |
EP0710301B1 (de) | 1998-04-15 |
JPH08512100A (ja) | 1996-12-17 |
DE4422420A1 (de) | 1995-01-12 |
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