WO1998024955A1 - Vorrichtung zur steuerung der querbewegung mindestens eines fadens einer textilmaschine - Google Patents
Vorrichtung zur steuerung der querbewegung mindestens eines fadens einer textilmaschine Download PDFInfo
- Publication number
- WO1998024955A1 WO1998024955A1 PCT/CH1997/000404 CH9700404W WO9824955A1 WO 1998024955 A1 WO1998024955 A1 WO 1998024955A1 CH 9700404 W CH9700404 W CH 9700404W WO 9824955 A1 WO9824955 A1 WO 9824955A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- driving part
- thread
- springs
- holding
- piston
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C3/00—Jacquards
- D03C3/20—Electrically-operated jacquards
- D03C3/205—Independently actuated lifting cords
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C13/00—Shedding mechanisms not otherwise provided for
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C13/00—Shedding mechanisms not otherwise provided for
- D03C13/02—Shedding mechanisms not otherwise provided for with independent drive motors
- D03C13/025—Shedding mechanisms not otherwise provided for with independent drive motors with independent frame drives
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C3/00—Jacquards
Definitions
- the innovation relates to a device for controlling at least one thread of a textile machine, in particular a warp thread of a weaving machine, according to the preamble of claim 1.
- Devices for controlling the transverse movement of a thread of a textile machine, in particular a warp thread of a weaving machine are known in large numbers.
- the threads are firmly drawn in and guided in the eyelets of strands, the strands themselves being moved according to the program via connecting means with various drive devices such as jacquard, dobby machines, treading devices and color control devices.
- a large number of components are involved in these machines and devices, which inevitably has a negative influence on the speed of the thread control.
- Other striking disadvantages of the known systems are: high inertia forces, high wear, high noise, high vibrations, large space requirements, high manufacturing and operating costs, poor ergonomics and the like.
- the device contains a driving part which is used to take at least one thread and is clamped between two springs.
- a holding device which can be controlled by means of a control unit serves to temporarily hold the driving part in at least one extreme position.
- the driving part is designed as a strand, which has a band part arranged between two insulators, in which a conductor is arranged. This part of the belt is guided over a roller that can be activated electrically.
- the frictional behavior of the belt part between the roller and the belt part is increased, so that it can be taken along by the roller and moved into an extreme position in which magnetic holding means are present that hold the strand hold on as long as the electrical holding devices are activated.
- the strand has to be equipped with a band part which contains electrically conductive means, and on the other hand the entrainment takes place via a pure frictional connection. This leads to high wear between the roller and the belt part.
- a constant friction behavior between the belt part and the roller is not guaranteed, since this is subject to ongoing changes due to wear and tear and pollution.
- the object of the innovation is to further improve a device of the type mentioned.
- the object is achieved by the characterizing features of claim 1. Because the springs and the driving part are designed as a system that freely oscillates at the natural frequency, this oscillates, once excited, automatically, and it is only necessary to add as much energy. result in system-related losses such as friction losses and the like being compensated for. Such an energy supply is possible with very simple means.
- the result is a device for controlling the transverse movement of at least one thread of a textile machine, which is extremely simple and can therefore be manufactured economically.
- the device is low-wear and requires little energy to keep it in operation.
- the holding device enables selective control directly on the thread-taking part.
- the low-component and low-wear device enables significantly higher drive speeds.
- An embodiment according to claim 3 is particularly advantageous, since, for example, a shed can be further controlled individually. In particular, it is possible to match the vibration system to the speed of the connected machine, in particular a weaving machine.
- a mechanically, pneumatically or electrically actuated holding pin can be assigned to the driving part.
- a particularly simple and low-wear device is described in claim 4.
- the magnetic device can, for example, be a permanent magnetic device which interacts with a ferromagnetic part and can be released by mechanical and pneumatic means.
- an embodiment according to claim 5 is more advantageous. In order to keep the vibrating system vibrating, it is necessary to supply energy according to claim 6. This can be done in very different ways.
- An embodiment according to claim 7 is particularly expedient, since here the holding device also serves to supply the necessary energy, since the driving part is always raised to the same height.
- a more active supply of energy is made possible by the embodiment according to claim 8.
- a pressure fluid supplied according to claim 9 can serve as a means for supplying energy.
- claim 10 describes a particularly simple solution. The energy supply can be designed in such a way that it goes beyond what is required to maintain the oscillation movement of the oscillation system, so that additional control effects can be achieved.
- the device is preferably equipped in accordance with claim 11 with a reset device to temporarily render the spring effects of the vibration system ineffective.
- a reset device is used in particular when, for example, the thread-carrying parts have to be brought into a central compartment position for adjustment and / or repair work. From this position, the device cannot start automatically since the spring effects cancel each other out.
- the reset device By means of the reset device, the corresponding thread-carrying parts have to be brought into contact with the holding devices in one of the extreme positions. Only from the extreme positions can the thread entrainment parts be released into the oscillating movement due to the corresponding spring preload.
- the resetting device can, for example, act directly on the thread driving part or relieve the springs on one side. The latter can be achieved for example by the training according to claim 12.
- the device is designed according to claim 13, wherein the thread driver is arranged between the springs and according to claim 15 as Eyelet is formed.
- the connection of the thread can be led out of the oscillating system by means of an extension of the driving part.
- the vibrating system can be used to control a single thread or simultaneously several threads.
- the driving part can be designed as a shaft frame.
- FIG. 1 shows the vibration system of Figure 1, in
- Figure 3 shows the course of the vibration of the vibration system of Figures 1 and 2 in the theoretical ideal state
- Figure 4 shows the vibration system of Figures 1 and 2 in real condition
- Figure 5 shows the vibration system of Figures 1 and 2 with holding devices in the extreme positions
- FIG. 6 shows a controlled course of the oscillation movement of the oscillation system according to FIG. 5;
- FIG. 7 shows the course of the curve of the vibration system as a function of the rotational position of the connected machine at different machine speeds
- Figure 8 shows the combination of a holding device and a device for supplying energy in vertical section
- Figures 9 and 10 a further holding device in the two extreme positions in vertical section
- Figure 11 shows another holding device
- FIG. 12 is a schematic illustration of a weaving machine equipped with the innovation device
- Figure 13 shows the force curve of the upper and lower springs of the device of Figure 12 during half a vibration process
- FIG. 15 the weaving machine of FIG. 14 with a holding device according to FIGS. 9 and 10;
- Figure 16 shows the schematic of a weaving machine with a further modified innovation device in a side view.
- FIGS. 1 and 2 as well as diagrams 3 and 4 show the principle of the oscillating system on which the present innovation is based, comprising a driving part 2 for the transverse movement of a thread 4, the driving part 2 by means of an upper spring 6 and a lower spring 8 in a machine frame 10 is clamped.
- the oscillation system would oscillate infinitely according to curve 13 in FIG. 3, specifically with the natural frequency f [oscillations / second]:
- V m mean:
- m the mass of the vibrating system, whereby the mass of the spring and that of the threads to be moved must also be taken into account;
- FIG. 5 and diagram 6 show the vibration system of FIGS. 1 and 2, but the device has been supplemented by an upper holding device 12 and a lower holding device 14, which are electromagnetic and can be controlled by a control unit 16.
- the vibrating driving part 2 is deflected into the extreme position caused by the amplitude A with each vibration.
- the holding devices 12, 14 serve on the one hand to supply energy, since they compensate for the vibration reduction ge ass ⁇ A, and on the other hand to control the vibration system.
- the entrainment part can be held in the upper or lower position during a full oscillation for an adjustable duration ts, as is indicated by curve sections 13b and 13c of curve 13 in FIG. This enables individual control of the transverse movement of the thread 4, as is required, for example, for the production of patterned fabrics in a weaving machine.
- FIG. 7 shows the course of the curve of the device for one revolution of the main shaft of a weaving machine at different speeds n [revolutions / second].
- Curve 13 shows the limit case when the speed of the weaving machine matches the frequency of the vibrating System corresponds. If the weaving machine runs slower, the vibration system must be stopped periodically in order to synchronize the vibration system with the speed of the weaving machine.
- Curve 13d shows the conditions for fast-running weaving machines, in which the stopping time per half oscillation is 2 x tsl. The stopping time increases when the speed of the weaving machine is reduced and is, for example, 2 x ts2 for curve 13e when the weaving machine runs more slowly.
- the area 15 available for weft insertion is also shown in FIG.
- FIG. 8 shows a further embodiment of the device for the transverse movement of a thread.
- the driving part 2a has a rod 18, on which a piston-like member 20 is attached, which is designed as a permanent magnet.
- This piston-like member is guided in a cylinder 22, which has a ferromagnetic termination 24, 26 at the upper and lower ends, to which the member 20 adheres in the upper or lower extreme position.
- a coil 28 is arranged in the cylinder 22 and is connected to the control unit 16 via lines 30. Depending on the activation of the coil 28, this device has very different tasks. On the one hand, the coil can serve to release the member 20 from the ferromagnetic termination 24, 26 in order to trigger the oscillatory movement.
- the coil 28 can also be activated in such a way that it supports the movement of the link 20 and thus of the driving part 2a against the termination 24 or 26.
- the coil 28 is used to supply energy to the vibration system.
- the configuration can be such that the cylinder 22 extends over the entire stroke of the driving part 2a.
- the cylinder 22 can be divided and, as in the embodiment according to FIG. 11, to be limited to the extreme positions of the vibration system.
- the cylinder can also be connected to a pressure flow system, which can be used for the controlled supply of energy.
- Figures 9 and 10 show a further driving part 2b, which is equipped with a rod 32 on which two piston-like Links 34,36 are arranged, between which holding devices 12b and 14b are fastened, which are combined in blocks.
- the holding device 12b determining the upper extreme position, against which the piston-like member 34 rests, lies below and the holding device 14b determining the lower extreme position against which the member 36 rests lies above.
- the holding devices 12b, 14b consist of permanent magnetic rings 38, the same poles of which face one another. Inside each ring 38 there are electromagnets 40 which can be actuated by the control unit 16 mentioned above.
- the piston-like members 34, 36 adhere firmly to the respective holding devices 12b, 14b and are only released when the electromagnets 40 are activated in order to be able to carry out a further oscillatory movement.
- FIG. 11 shows the device of FIGS. 9 and 10, but the holding devices 12c, 14c are arranged at a distance from one another which determines the stroke, and the driving part 2c has only one piston-like member 42 which goes back and forth between the two holding devices 12c, 14c is movable.
- FIG. 12 shows the diagram of a weaving machine on which the devices of the type according to the innovation are arranged.
- the weaving machine contains a warp beam 44, on which warp threads 46 are wound, which are fed to the weaving point 50 via a deflection roller 48.
- Devices 52 according to the invention serve to control the warp threads 46 and to form the shed 54, into which weft threads 56 are inserted and which are picked up by means of a reed 58.
- the fabric 60 produced is drawn off via a goods take-off 62.
- the control device 52 contains a driving part 2a and a holding device 12a, 14a in accordance with the type shown in FIG. 8.
- the driving part 2a is provided with a strand 64 which has an eyelet 66 for driving a warp thread 46.
- the control device 52 is also equipped with a resetting device 68 which has an arm 72 which can be pivoted about an axis 70 and to which the lower end of the lower spring 8 is fastened.
- An actuator 74 can move the swivel arm Move up and relieve the springs 8.
- the resetting device 68 serves to bring the control device 52 into a starting position required for starting the operation, in which the piston-like member 20 bears against the respective holding device 12a, 14a if this is not the case for any reason, for example after adjustment or repair work should be the case.
- Such a situation exists, for example, when the eyelets are in the central compartment 76.
- the lower springs 8 are relieved when the actuator 74 is actuated, as a result of which the spring force of the upper springs 6 predominates, so that the piston-like members 20 can be brought into contact with the respective upper holding devices 12
- FIG. 13 shows the force curve of the springs 6, 8, where Ko stands for the upper spring 6 and Ku stands for the lower spring 8, from which the force curve Kr results for the driving part 2a. It can be seen from this that when the driving part 2a is located in the central compartment 76, no force acts on the driving part, so that the driving part 2a can only be brought into contact with a holding device again by the resetting device 68.
- FIG. 14 shows the diagram of a further weaving machine, which is designed analogously to that of FIG. 12, but is equipped with holding devices 12c, 14c according to FIG.
- FIG. 15 shows the diagram for equipping the weaving machine with holding devices 12b, 14b according to FIGS. 9 and 10.
- FIG. 16 shows the weaving machine shown schematically in FIG. 14, but the eyelet 78 for carrying the warp thread 46 is not arranged inside, that is to say between the upper and lower springs 6, 8, but outside.
- the driving part 2d is designed as a rod which is extended upwards by the upper spring 6 and carries the eyelet 78 there.
- an eyelet for carrying an individual thread is shown as the thread driver.
- the order can also be made so that the driving part is connected to a known shaft frame instead of the eyelet, which serves for the simultaneous guidance of several threads.
- the device according to the innovation can thus achieve, for example, the following essential properties or advantages:
- the machine does not require any superstructures. This gives an optimal overview of the whole machine and excellent handling.
- the workplace can be optimally equipped with ergonomic ergonomics.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97944673A EP0943023B1 (de) | 1996-12-03 | 1997-10-24 | Vorrichtung zur steuerung der querbewegung mindestens eines fadens einer textilmaschine |
AU46134/97A AU4613497A (en) | 1996-12-03 | 1997-10-24 | Device for controlling the transverse movement of at least one thread in a textile machine |
DE59707446T DE59707446D1 (de) | 1996-12-03 | 1997-10-24 | Vorrichtung zur steuerung der querbewegung mindestens eines fadens einer textilmaschine |
US09/308,895 US6079455A (en) | 1996-12-03 | 1997-10-24 | Device for controlling the transverse movement of at least one thread in a textile machine |
JP52501598A JP4093593B2 (ja) | 1996-12-03 | 1997-10-24 | 繊維機械の少なくとも1本の糸の横運動の制御のための装置 |
CA002273885A CA2273885C (en) | 1996-12-03 | 1997-10-24 | Device for controlling the transverse movement of at least one thread in a textile machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29621008U DE29621008U1 (de) | 1996-12-03 | 1996-12-03 | Vorrichtung zur Steuerung der Querbewegung mindestens eines Fadens einer Textilmaschine |
DE29621008.0 | 1996-12-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998024955A1 true WO1998024955A1 (de) | 1998-06-11 |
Family
ID=8032778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1997/000404 WO1998024955A1 (de) | 1996-12-03 | 1997-10-24 | Vorrichtung zur steuerung der querbewegung mindestens eines fadens einer textilmaschine |
Country Status (10)
Country | Link |
---|---|
US (1) | US6079455A (de) |
EP (1) | EP0943023B1 (de) |
JP (1) | JP4093593B2 (de) |
CN (1) | CN1077161C (de) |
AU (1) | AU4613497A (de) |
CA (1) | CA2273885C (de) |
DE (2) | DE29621008U1 (de) |
ES (1) | ES2175468T3 (de) |
TW (1) | TW380175B (de) |
WO (1) | WO1998024955A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001086045A1 (en) * | 2000-05-08 | 2001-11-15 | Micael Schmitz Elektronic Ab | Device for shed-forming displacement of warp threads in a loom |
WO2008116325A1 (de) * | 2007-03-27 | 2008-10-02 | Textilma Ag | Vorrichtung zur steuerung der querbewegung der kettfäden einer textilwebmaschine |
US7806149B2 (en) | 2006-09-28 | 2010-10-05 | Textilma Ag | Shedding apparatus for a weaving machine, in particular for a ribbon weaving machine |
WO2012163571A2 (de) | 2011-06-01 | 2012-12-06 | Textilma Ag | Schaftwebmaschine und entsprechendes webverfahren |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29621008U1 (de) * | 1996-12-03 | 1997-01-30 | Textilma Ag | Vorrichtung zur Steuerung der Querbewegung mindestens eines Fadens einer Textilmaschine |
DE10331916A1 (de) * | 2003-07-15 | 2005-02-24 | Lindauer Dornier Gmbh | Antriebsvorrichtung zur Erzeugung einer hin- und hergehenden Bewegung eines angetriebenen Bauteil, insbesondere in Webmaschinen |
US6948530B2 (en) * | 2004-01-02 | 2005-09-27 | Yi-Shan Yao | Weaving machine |
BE1016217A5 (nl) * | 2004-09-28 | 2006-05-02 | Wiele Michel Van De Nv | Gaapvormingsinrichting en weefmachine voorzien van dergelijke gaapvormingsinrichting. |
CN101080519B (zh) * | 2004-12-16 | 2011-01-12 | 泰克斯蒂尔玛股份公司 | 用于纺织技术的梭口装置 |
CN101516612B (zh) * | 2006-08-04 | 2012-09-05 | Md光纤技术公司 | 用于连续制造多轴向织物幅的方法 |
JP5188944B2 (ja) * | 2008-12-08 | 2013-04-24 | 株式会社豊田自動織機 | 綜絖枠 |
JP4821868B2 (ja) | 2009-03-13 | 2011-11-24 | 横浜ゴム株式会社 | 熱可塑性エラストマー組成物 |
CN104032439A (zh) * | 2014-05-26 | 2014-09-10 | 苏州潮盛印花制版实业有限公司 | 一种电磁经线调节装置 |
CN104141192B (zh) * | 2014-07-11 | 2015-10-28 | 青岛铠硕纺机有限公司 | 交织方式的喷水织机 |
BE1021951B1 (nl) * | 2014-07-18 | 2016-01-28 | Michel Van De Wiele Nv | Gaapvormingsinrichting voor een weefmachine |
IT202000014749A1 (it) * | 2020-06-19 | 2021-12-19 | Textilma Ag | Gruppo attuatore per una macchina tessile |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2203925A1 (de) * | 1972-01-28 | 1973-08-02 | Vaupel Gustav Adolf | Steuervorrichtung fuer die laengsbewegung von fadenfuehrungselementen in textilmaschinen, wie webmaschinen |
EP0304985A1 (de) * | 1987-08-26 | 1989-03-01 | N.V. Florin | Fachbildungsvorrichtung für Webmaschinen |
EP0353005A1 (de) * | 1988-07-26 | 1990-01-31 | Raymond Leslie Palmer | Kontrollvorrichtung für Webmaschinen oder dergleichen |
DE29621008U1 (de) * | 1996-12-03 | 1997-01-30 | Textilma Ag | Vorrichtung zur Steuerung der Querbewegung mindestens eines Fadens einer Textilmaschine |
Family Cites Families (5)
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US3867966A (en) * | 1971-10-16 | 1975-02-25 | Sulzer Ag | Electro-mechanical device for forming a shed in a weaving machine |
DE2746094A1 (de) * | 1977-10-13 | 1979-04-26 | Stapperfend Gmbh & Co | Verfahren und vorrichtung zur fachbildung bei webmaschinen |
DE3130461A1 (de) * | 1981-07-23 | 1983-02-10 | Vaupel Textilmaschinen KG, 5600 Wuppertal | Vorrichtung zur bildung des faches in webmaschinen, insbesondere bandwebmaschinen |
DE3301931C2 (de) * | 1982-10-26 | 1986-08-28 | Textilma Ag, Hergiswil | Einzellitzensteuervorrichtung für eine Webmaschine mit einer Fachbildevorrichtung |
DE3902792C1 (de) * | 1989-01-31 | 1990-03-01 | Fa. Oskar Schleicher, 4050 Moenchengladbach, De |
-
1996
- 1996-12-03 DE DE29621008U patent/DE29621008U1/de not_active Expired - Lifetime
-
1997
- 1997-10-24 ES ES97944673T patent/ES2175468T3/es not_active Expired - Lifetime
- 1997-10-24 WO PCT/CH1997/000404 patent/WO1998024955A1/de active IP Right Grant
- 1997-10-24 AU AU46134/97A patent/AU4613497A/en not_active Abandoned
- 1997-10-24 JP JP52501598A patent/JP4093593B2/ja not_active Expired - Lifetime
- 1997-10-24 CA CA002273885A patent/CA2273885C/en not_active Expired - Fee Related
- 1997-10-24 US US09/308,895 patent/US6079455A/en not_active Expired - Lifetime
- 1997-10-24 EP EP97944673A patent/EP0943023B1/de not_active Expired - Lifetime
- 1997-10-24 DE DE59707446T patent/DE59707446D1/de not_active Expired - Lifetime
- 1997-10-24 CN CN97180265A patent/CN1077161C/zh not_active Expired - Fee Related
- 1997-11-08 TW TW086116674A patent/TW380175B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2203925A1 (de) * | 1972-01-28 | 1973-08-02 | Vaupel Gustav Adolf | Steuervorrichtung fuer die laengsbewegung von fadenfuehrungselementen in textilmaschinen, wie webmaschinen |
EP0304985A1 (de) * | 1987-08-26 | 1989-03-01 | N.V. Florin | Fachbildungsvorrichtung für Webmaschinen |
EP0353005A1 (de) * | 1988-07-26 | 1990-01-31 | Raymond Leslie Palmer | Kontrollvorrichtung für Webmaschinen oder dergleichen |
DE29621008U1 (de) * | 1996-12-03 | 1997-01-30 | Textilma Ag | Vorrichtung zur Steuerung der Querbewegung mindestens eines Fadens einer Textilmaschine |
Non-Patent Citations (1)
Title |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001086045A1 (en) * | 2000-05-08 | 2001-11-15 | Micael Schmitz Elektronic Ab | Device for shed-forming displacement of warp threads in a loom |
US7806149B2 (en) | 2006-09-28 | 2010-10-05 | Textilma Ag | Shedding apparatus for a weaving machine, in particular for a ribbon weaving machine |
WO2008116325A1 (de) * | 2007-03-27 | 2008-10-02 | Textilma Ag | Vorrichtung zur steuerung der querbewegung der kettfäden einer textilwebmaschine |
US7806146B2 (en) | 2007-03-27 | 2010-10-05 | Textilma Ag | Device for controlling the transverse movement of the warp threads of a textile weaving machine |
WO2012163571A2 (de) | 2011-06-01 | 2012-12-06 | Textilma Ag | Schaftwebmaschine und entsprechendes webverfahren |
Also Published As
Publication number | Publication date |
---|---|
JP4093593B2 (ja) | 2008-06-04 |
ES2175468T3 (es) | 2002-11-16 |
DE29621008U1 (de) | 1997-01-30 |
JP2001504901A (ja) | 2001-04-10 |
EP0943023B1 (de) | 2002-06-05 |
CA2273885A1 (en) | 1998-06-11 |
US6079455A (en) | 2000-06-27 |
EP0943023A1 (de) | 1999-09-22 |
TW380175B (en) | 2000-01-21 |
CA2273885C (en) | 2005-10-04 |
DE59707446D1 (de) | 2002-07-11 |
CN1239524A (zh) | 1999-12-22 |
AU4613497A (en) | 1998-06-29 |
CN1077161C (zh) | 2002-01-02 |
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