Stopper magnet for a measuring yarn feeder
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IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0479389
(2002-05-29)
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우선권정보 |
SE-0001890 (2001-05-29) |
국제출원번호 |
PCT/EP02/05943
(2004-06-14)
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§371/§102 date |
20040614
(20040614)
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국제공개번호 |
WO02/09717
(2002-12-05)
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발명자
/ 주소 |
- Johansson, Birger
- Svensson, Henrik
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출원인 / 주소 |
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대리인 / 주소 |
Flynn, Thiel, Boutell &
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인용정보 |
피인용 횟수 :
0 인용 특허 :
8 |
초록
▼
A method for controlling the motion of a yarn stopper magnet in a measuring feeder for textile machines, preferably for weaving machines of the air-or waterjet-type. The stopper magnet has an armature connected to a yarn stopper element, which armature co-acts with at least one electromagnetic coil
A method for controlling the motion of a yarn stopper magnet in a measuring feeder for textile machines, preferably for weaving machines of the air-or waterjet-type. The stopper magnet has an armature connected to a yarn stopper element, which armature co-acts with at least one electromagnetic coil in order to achieve the desired motion of the stopper magnet. During an initial part of the motion of the stopper element, the electromagnetic coil is supplied with a voltage with an amplitude considerably exceeding the average level of the voltage during the remaining part of the motion, in order to achieve an optimally fast motion with a low input energy amount and thereby a low heat development, as well as low kinetic energy (speed) of the stopper element at the end of its motion.
대표청구항
▼
1. Method for controlling the motion cycle of a yarn stopper magnet in a measuring yarn feeder for textile machines, the stopper magnet having an armature connected to a yarn stopper element, which armature co-acts with at least one electromagnetic coil for achieving the desired motion cycle of the
1. Method for controlling the motion cycle of a yarn stopper magnet in a measuring yarn feeder for textile machines, the stopper magnet having an armature connected to a yarn stopper element, which armature co-acts with at least one electromagnetic coil for achieving the desired motion cycle of the yarn stopper element at least from an initial start position at a first point in time to an end position reached at a second point in time, wherein during at least an initial part of the motion cycle the electromagnetic coil is supplied with an increased voltage with an amplitude considerably exceeding the average voltage level amplitude during the remaining part of the motion cycle and for a duration not essentially greater than an electric time constant part of the stopper magnet.2. Method according to claim 1, wherein the increased voltage exceeds the average voltage level during the remaining of the motion cycle by at least 100%.3. Method according to claim 1, wherein the initial part of the motion cycle has a duration of approximately 1 millisecond (ms).4. Method according to claim 1, wherein after the initial part of the motion cycle and in close proximity to a nominal point in time corresponding to the end position of the yarn stopper element, a second increased voltage is supplied to the electromagnetic coil, the second increased voltage being smaller than the first increased voltage, and the second increased voltage being supplied for a duration not essentially greater than the electric time constant of the stopper magnet.5. Method according to claim 1, wherein the increased voltage is controlled to drop according to a predetermined curve or in one or several predetermined steps to the average voltage level amplitude.6. Method according to claim 1, wherein a holding current for holding the armature and the yarn stopper element in the end position is reduced considerably or is shut off completely just before starting a return motion of the yarn stopper element .7. Method as in claim 1, wherein a holding force is generated in the end position of the yarn stopper element by a permanent magnet mounted to the yarn stopper element co-acting with soft-iron material mounted to a fixed part of the stopper magnet.8. Stopper magnet for a measuring yarn feeder for textile machines, and for carrying out the method according to claim 1, the stopper magnet having an armature connected to a yarn stopper element, which armature co-acts with at least one electromagnetic coil for achieving a desired motion cycle of the yarn stopper element at least from an initial start position to an end position, wherein the electromagnetic coil is connected with a DC-voltage source supplying maximally approximately 300 volts or with a voltage generator supplying maximally approximately 48 volts and is designed for an average long duration voltage level amplitude in the range between approximately 5 V to 150 V or 15 V to 25 V, respectively, and a permanent magnet is mounted to the yarn stopper element for yarn providing a holding force in the end position of the yarn stopper element in cooperation with a member of soft-magnetic iron placed in a fixed part of the stopper magnet.9. Stopper magnet according to claim 8, wherein at least one counter-mass, of soft magnetizable or soft-magnetic machine steel is axially movably located at least partly within the electromagnetic coil in an aperture of the stopper magnet for mechanical co-action with the armature, wherein the counter-mass is loosely kept in position in proximity to a resilient damper, and wherein the counter-mass has a mass of the same magnitude as the sum of the masses of the armature, the yarn stopper element and the permanent magnet.10. Stopper magnet as in claim 8, wherein the yarn stopper element is a metal tube at least partially filled with plastic material, and wherein the armature is formed as a shell made of magnetizable or magnetic material and is attached to the yarn stopper element by a filling of plastic material provided in the shell.11. Method according to claim 1, wherein the increased voltage exceeds the average voltage level during the remaining part of the motion cycle by at least 300%.12. Method according to claim 4, wherein the second increased voltage is supplied for a duration of approximately 2 milliseconds (ms).13. Method according to claim 12, wherein the second increased voltage is controlled to drop according to a predetermined curve or in one or several predetermined steps to the average voltage level amplitude.
이 특허에 인용된 특허 (8)
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Covelli Marco,ITX, Device to block weft yarn during cutting on a weft feeder.
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Maina Bruno (Valdengo ITX), Electromagnet for stopping the unwinding of the weft yarn in weft feeding devices for weaving looms.
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Ghiardo Fiorenzo (Vigliano Biellese ITX), Electromagnetic blocking unit for a weft storage drum.
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Zenoni Pietro,ITX ; Pedrini Giovanni,ITX ; Castelli Rosario,ITX, Electromagnetic yarn stopping device for premeasuring weft feeders of air-jet looms.
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Lillie James B. (Longmont CO) Sanford James L. (Boulder CO), Fast cycling, low power driver for an electromagnetic device.
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Grundmann Ernst H. (4005 Meerbusch 2 Am Sportplatz 36a ; DEX), Low voltage switchgear.
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Menzel Klaus (Berlin DEX) Erd Ludwig (Berlin DEX) Marinescu Marlene (Frankfurt am Main DEX), Magnetic drive system for generating linear movements.
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Tholander Lars H. G. (Ulricehamn SEX), Weft measurer and storer with bistable solenoid controlled stop pin.
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