EP1201805B1 - Throttle valve and weft insertion apparatus in a jet loom provided with the same - Google Patents

Throttle valve and weft insertion apparatus in a jet loom provided with the same Download PDF

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Publication number
EP1201805B1
EP1201805B1 EP01125328A EP01125328A EP1201805B1 EP 1201805 B1 EP1201805 B1 EP 1201805B1 EP 01125328 A EP01125328 A EP 01125328A EP 01125328 A EP01125328 A EP 01125328A EP 1201805 B1 EP1201805 B1 EP 1201805B1
Authority
EP
European Patent Office
Prior art keywords
valve
weft insertion
valve body
nozzle
throttle
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
Application number
EP01125328A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1201805A2 (en
EP1201805A3 (en
Inventor
Hirohiko Ishikawa
Masao Shiraki
Daisuke Ito
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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
Priority claimed from JP2000329890A external-priority patent/JP2002138349A/ja
Priority claimed from JP2001123746A external-priority patent/JP2002317350A/ja
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1201805A2 publication Critical patent/EP1201805A2/en
Publication of EP1201805A3 publication Critical patent/EP1201805A3/en
Application granted granted Critical
Publication of EP1201805B1 publication Critical patent/EP1201805B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/306—Construction or details of parts, e.g. valves, ducts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3053—Arrangements or lay out of air supply systems

Definitions

  • the present invention relates to a throttle valve for regulating the flow rate of a pressure fluid. More specifically, the present invention relates to a weft insertion apparatus adopting the throttle valve in a jet loom in which a switch valve is present in a fluid channel leading to a weft insertion nozzle or an auxiliary nozzle disposed in a weft insertion path, supply and suspension of supply of compressed air to the weft insertion nozzle or auxiliary nozzle are conducted by switching the switch valve, and weft insertion is effected by a compressed air injection function of the weft insertion nozzle or auxiliary nozzle in an open state of the switch valve.
  • compressed air from a pressure source 1 such as a compressor is adjusted to a set pressure by a pressure reducing valve 2 disposed in a first conduit 3, guided to a compressed air supply tank 4, and reserved therein.
  • a pressure reducing valve 2 disposed in a first conduit 3, guided to a compressed air supply tank 4, and reserved therein.
  • the pressure source 1, the pressure reducing valve 2, the first conduit 3, and the compressed air supply tank 4 are collectively referred to as a compressed air source.
  • the compressed air travels from the compressed air supply tank 4 to a second conduit 5, has its flow rate regulated by a throttle valve 7, and appropriately supplied to a weft insertion nozzle 8 via an electromagnetic switch valve 7.
  • a weft is injected from the weft insertion nozzle 8 to a warp opening by compressed air.
  • it is required to appropriately regulate the flow rate of the compressed air injected from the weft insertion nozzle 8 by the electromagnetic switch valve 7 in accordance with the kind of a weft and various kinds of operation states so that a time for the tip end of the weft to reach a selvage becomes constant.
  • a valve body 15 is disposed so as to be opposed to the valve hole 13, and a valve 16 is disposed so as to be opposed to a valve hole 14.
  • the valve body 15 has a cylindrical shape with a slanted cross-section 17.
  • An opening degree of the valve hole 13 is regulated on the side of the valve body 15 opposed to the valve hole 13 by rotating of the valve body 15 about an axis in the conduit 10. Due to the regulation of the opening, the flow rate of the compressed air is regulated.
  • the relationship between the rotating angle of the valve body 15 and the effective cross-sectional area of the fluid channel is as shown in a graph of Fig. 3A.
  • the relationship between the rotating angle of the valve body 15 and the entrance pressure of the nozzle 8 is as shown in Fig. 3B.
  • the valve hole 14 is appropriately opened/closed by the valve 16 operated by a solenoid 18.
  • the present invention has been made in view of the above-mentioned problems, and a primary object of the present invention is therefore to provide a throttle valve with high precision, which has a low pressure loss and can easily regulate a flow rate.
  • a throttle valve according to claim 1 is provided
  • a change in the cross-sectional area of the flow channel is smooth at a throttle portion. Therefore, a loss of pressure is small, and vena contracta a is unlikely to occur. Furthermore, a change in the cross-sectional area of the flow channel has linearity with respect to a rotating angle of the valve body, so that it becomes easy to regulate the flow rate.
  • the depth of the concave engraved portion becomes gradually deeper toward the circumferential direction, and then, becomes gradually shallow.
  • a change in the cross-sectional area of the flow channel is smooth at the throttle portion and a loss of pressure becomes small.
  • the concave engraved portion is composed of a combination of partial cones formed about an axial center eccentric to an axial center of the valve body. Because of this configuration, the concave engraved portion of the valve body can be easily formed by simple mechanical processing using turning.
  • valve body is cylindrical
  • the concave engraved portion is formed on the circumferential surface of the cylindrical valve body, and a track of the concave engraved portion corresponding to rotation of the valve body crosses the fluid channel.
  • a change in a passage cross-sectional area involved in rotation of the cylindrical valve body can be further smooth.
  • the above-mentioned throttle valve further includes an actuator provided with an output axis that is electrically rotated, in which the valve body can be regulated for rotation by being attached to the output axis of the actuator. Because of this configuration, the rotation of the valve boy can be automated.
  • a central axis of the valve hole is provided at a position eccentric to a central axis of the fluid channel. Because of this configuration, a flow channel with a certain size can be kept at all times even when the flow rate is made minimum.
  • a weft insertion apparatus in a jet loom includes the above-mentioned throttle valve, and is characterized in that the fluid channel connects a compressed air source adjusted for pressure in a jet loom to a nozzle for injecting the compressed air.
  • the above-mentioned functions of a throttle valve can be exhibited in a jet loom. More specifically, in a jet loom, fine pressure adjustment is made depending upon the kind of a weft to be used and a weft insertion state. Therefore, a weft insertion function can be enhanced, leading to a reduction in a consumption amount of the compressed air.
  • a weft insertion apparatus in a jet loom of the present invention is characterized in that the nozzle is a weft insertion nozzle for inserting a weft, the weft insertion apparatus in the jet loom further includes a switch valve provided on the fluid channel connecting the compressed air source to the weft insertion nozzle, the switch valve supplying and stopping supply of the compressed air to the weft insertion nozzle by switching of the switch valve, and allowing the weft to be inserted by a compressed air injection function of the weft insertion nozzle in an open state of the switch valve, and a throttle state of the throttle valve is controlled in accordance with a switch timing of the switch valve for one cycle of weft insertion.
  • a driving signal of a pulse train is output to an electromagnetic switch valve to open/close the electromagnetic switch valve little by little, and an injection pressure at the end of injection of the weft insertion nozzle is gradually decreased.
  • injection pressure characteristics at the weft insertion nozzle can be improved without using an electromagnetic switch valve capable of operating at a high speed.
  • the injection pressure characteristics at the weft insertion nozzle can be adjusted by selecting a throttle state of a throttle valve different from a switch valve. Thus, it is not required to operate the switch valve at a high speed in order to obtain desired injection pressure characteristics.
  • the above-mentioned weft insertion control apparatus in a jet loom further includes a control means for controlling a throttle state of the throttle valve in accordance a switch timing of the switch valve for one cycle of weft insertion.
  • the throttle state of the throttle valve can be regulated more easily.
  • the throttle valve is provided upstream from the switch valve.
  • a place upstream from the switch valve is suitable for disposing the throttle valve in order to avoid a prolonged pressure remaining state downstream from the switch valve.
  • weft insertion nozzle can be at least one of a weft insertion main nozzle and weft insertion auxiliary nozzle.
  • Fig. 1 has been referred to for the purpose of illustrating the prior art.
  • the basic configuration of the present invention is the same as that shown in Fig. 1 in the case of adopting the present invention in a jet loom. Therefore, only the throttle valve of the present invention is denoted with new reference numerals (60, 80, 90 and 100), and the other elements are denoted with the same reference numerals as those in Fig. 1.
  • a throttle valve 60 of the present invention will be described in detail with reference to Figs. 4 to 8.
  • a fluid channel 62 communicated with a second conduit 5 is drilled through a body 61, and a valve hole 63 is bored in the body 61 in a direction orthogonal to the fluid channel 62.
  • the fluid channel 62 and the valve hole 63 are communicated with each other.
  • a valve body 64 with a cylindrical shape is inserted into the valve hole 63 about its axial center so that its rotating can be regulated.
  • the central axis of the valve hole 63 is provided at a position decentered from the central axis of the fluid channel 62.
  • the cross-sectional area of the fluid channel 62 can be made zero, i.e., the throttle valve 60 can be fully closed, depending upon the diameter and eccentricity of the valve body 64. This will be described in detail below.
  • One end of a projection of the valve body 64 from the body 61 is covered with a knob 65 for regulating the valve body 64 by its rotating.
  • the other end of the projection of the valve body 64 from the body 61 is provided with a circlip 66 for preventing the projection from dropping.
  • O-ring grooves 67 are engraved in the vicinity of both ends of the valve body 64. In the O-ring groove 67, an O-ring 68 for keeping airtightness is fitted.
  • a concave engraved portion 69 whose depth is continuously varied in an outer peripheral direction is provided on an outer peripheral surface.
  • the concave engraved portion 69 can be easily obtained by cutting with a bite while the valve body 64 is rotated by being chucked at an eccentric position, using turning, for example.
  • upper and lower partial cones 70a and 70b are combined to form the concave engraved portion 69.
  • the depth of the concave engraved portion 69 is continuously varied in a circumferential direction (continuously increased, and continuously decreased). More specifically, the cross-sectional area of the fluid channel is continuously varied.
  • the concave engraved portion is composed of a combination of partial cones directed in opposite directions with each other, and the cross-section of the fluid channel of the concave engraved portion has a triangle shape.
  • the present invention is not limited thereto.
  • the cross-section of the fluid channel of the concave engraved portion can be varied in various kinds of shapes such as a semicircular shape and a square shape.
  • the regulation of the flow rate of the compressed air supplied to a weft insertion nozzle 8 (regulation of the pressure at an entrance of the weft insertion nozzle 8) is conducted by operator's rotating the valve body 64 with the knob 65. More specifically, due to the rotation of the valve body 64, the effective cross-sectional area of the fluid channel 62 is appropriately regulated by the concave engraved portion 69.
  • a central line S line connecting an axial center of the partial cones 70a and 70b forming the concave engraved portion 69 to an axial center of the valve body 64
  • a channel width G 1 at the concave engraved portion 69 becomes maximum. That is, the cross-sectional area of the flow channel becomes maximum.
  • valve body 64 is further rotated to a position shown in Fig. 8. At this position, sealing is possible at a portion 71, and a channel width G 3 at the concave engraved portion 69 becomes minimum. More specifically, the cross-sectional area of the flow channel becomes minimum. The cross-sectional area of the flow channel is continuously varied gently between the maximum and the minimum (see Fig. 9A). Therefore, the pressure at the entrance of the weft insertion nozzle 8 also satisfies the relationship shown in Fig. 9B, and more controllability and higher precision can be obtained.
  • the rotating of the valve body 64 is regulated manually by an operator via the knob 65.
  • an actuator such as a stepping motor, a servo motor, and a solenoid is connected to the valve body instead of the knob, the rotating can be regulated automatically.
  • the entire system that controls the flow rate of the compressed air can be controlled automatically. This will be described below.
  • a throttle valve 60 is provided in the fluid channel connecting the compressed air source of a jet loom to the weft insertion nozzle (weft insertion main nozzle) 8.
  • a throttle valve may be provided in the fluid channel connecting a plurality of auxiliary nozzles disposed in a bending width direction of the jet loom (that is, along a weft insertion path of a weft) to the compressed air source.
  • a throttle valve 80 of Embodiment 2 according to the present invention will be described with reference to Figs . 10A to 10C and 11A to 11C.
  • Reference numeral 8 shown in Fig. 10A denotes a weft insertion main nozzle.
  • a weft Y is injected to a warp opening by the weft insertion main nozzle 8 for weft insertion.
  • Reference numeral 4 denotes a compressed air supply tank.
  • the pressure of the compressed air supply tank 4 is regulated by a pressure reducing valve 2.
  • the compressed air supply tank 4 is connected to the electromagnetic switch valve 7 via a supply tube 85.
  • a valve hole 91 is formed so as to be orthogonal to the fluid channel 141 for the compressed air in the supply tube 85.
  • a valve body 87 is rotatably attached. More specifically, the valve body 87 is provided so that its rotating central axis line 161 is orthogonal to the fluid channel 141.
  • the valve body 87 is attached to an output axis 171 of a stepping motor 88.
  • the stepping motor 88 rotates the valve body 87.
  • the stepping motor 88 is controlled by the control apparatus 89.
  • the control apparatus 89 controls the rotation of the stepping motor 88 based on a loom rotation angle detection information obtained by a rotary encoder 90 that detects the rotation angle of the loom.
  • the control apparatus 89 that is control means controls the operation of the stepping motor 88 in accordance with a switch timing of the electromagnetic switch valve 7 for one weft insertion cycle.
  • a concave engraved portion 162 is formed on a circumferential surface of the valve body 87 so as to extend in a circumferential direction.
  • the concave engraved portion 162 is formed by combining a pair of cone surfaces E1 and E2 in opposite directions with each other.
  • the concave engraved portion 162 becomes gradually deep toward a circumferential direction, and then, becomes gradually shallow.
  • the track of the concave engraved portion 162 corresponding to the rotation of the valve body 87 crosses the fluid channel 114.
  • the compressed air of the compressed air supply tank 4 cannot be supplied to the side of the electromagnetic switch valve 7.
  • the valve body 87 is at a rotation position in Fig. 10C, the cross-sectional area through which fluid passes in the valve hole 91 becomes maximum. Therefore, the compressed air in the compressed air supply tank 4 can be supplied in the maximum amount to the electromagnetic switch valve 7.
  • valve hole 91 described above, and the valve body 87 provided with the concave engraved portion 162 constitute a throttle valve 80.
  • a curve M in Fig. 11A represents an exciting signal with respect to the electromagnetic switch valve 7 for one cycle of weft insertion.
  • a curve C1 represents a valve opening regarding the valve body 87 for one cycle of weft insertion (i.e., a passage cross-sectional area at the valve hole 91).
  • the valve opening regarding the valve body 87 is prescribed as follows: a fully closed state in Figs. 10B and 11B is valve opening zero, and a fully opened state in Figs. 10C and 11C is a maximum valve opening Ho.
  • a curve F1 represents a valve opening state represented by the curve C1, i.e., an injection pressure waveform of the weft insertion main nozzle 8 for one cycle of weft insertion in the case where a throttle state and an exciting signal M are given.
  • a curve Fo in Fig. 11D represents an injection pressure waveform when the electromagnetic switch valve 7 is excited in the absence of the throttle valve composed of the stepping motor 88 and the valve body 87.
  • a horizontal axis ⁇ of each graph represents a loom rotation angle.
  • the control apparatus 89 controls the operation of the stepping motor 88 so that the valve body 87 changes the rotation position in the order of Figs. 10B and 10C, Figs. 11B and 11C.
  • the throttle state shown in Figs. 10B and 10C correspond to one cycle of weft insertion
  • the throttle state shown in Figs. 11B and 11C corresponds to the subsequent one cycle of weft insertion.
  • a central axis line 211 of a valve hole 92 of the throttle valve 90 in Embodiment 3 as shown in Fig. 12B is positioned away from a central axis line of a fluid channel 141.
  • a concave engraved portion 221 is formed so as to extend in a circumferential direction.
  • the concave engraved portion 221 is formed by combining a pair of cone surfaces E3 and E4 in opposite directions with each other.
  • the concave engraved portion 221 becomes gradually deep toward the circumferential direction, and then, becomes gradually shallow.
  • a track of the concave engraved portion 221 corresponding to the rotation of the valve body 93 crosses the fluid channel 141.
  • the passage cross-sectional area in the vicinity of the valve hole 92 becomes maximum.
  • the passage cross-sectional area in the vicinity of the valve hole 92 becomes minimum.
  • a curve C2 in Fig. 13D represents a valve opening regarding the valve body 93, i.e., a passage cross-sectional area in the vicinity of the valve hole 92.
  • the valve opening regarding the valve body 93 is prescribed as follows: the throttle degree in Figs. 12A, 12B, and 13A is a maximum valve opening H1, and the throttle degree in Figs. 13B and 13C is a minimum valve opening H2.
  • a curve F2 represents an injection pressure waveform of the weft insertion main nozzle 8 in the case where a valve opening state represented by the exciting signal M and the curve C2 is given.
  • the control apparatus 89 controls the operation of the stepping motor 88 so that the valve body 93 changes the rotation position in the order of Figs. 13A, 13B, and 13C.
  • the throttle state shown in Figs. 13A, 13B, and 13C corresponds to one cycle of weft insertion.
  • the injection pressure characteristics represented by the curve F3 in the graph shown in Fig. 14, injection pressure characteristics represented by the curves F41 and F42 in the graph shown in Fig. 15, and injection pressure characteristics represented by the curve F5 in the graph shown in Fig. 16 can be realized. It is understood from Fig. 14 that steep falling of an injection pressure is suppressed in the same way as in Embodiment 2.
  • Fig. 15 shows an example in which cutting shock caused when an inserted weft is separated from fabric by cutting is alleviated by an injection pressure represented by a curve F42.
  • Fig. 16 shows an example in which steep rising of an injection pressure is suppressed in weft insertion of weak thread, thereby preventing thread breakage.
  • valve opening curves C3 and C5 are obtained by using the throttle valve 90 in Embodiment 3.
  • valve opening curves C41 and C42 can be obtained by using the throttle valve 80 in Embodiment 2.
  • a valve body 95 is disposed at a right-angle portion of a fluid channel 231 in a supply tube 94 having an angle shape.
  • the valve body 95 driven by a stepping motor 88 is provided with a slanted surface 241.
  • the slanted surface 241 rotates between a solid line position and a broken line position in Fig. 17.
  • the throttle amount by the valve body 95 is adjusted by the rotation position of the valve body 95.
  • valve bodies 87, 93, and 95 can be driven with a servo motor. Furthermore, in the case where the valve bodies 87, 93, and 95 are switched only between two positions, they can be driven with a rotary solenoid. Furthermore, as a throttle valve, a normally open type electromagnetic switch valve can be used. A throttle valve can also be disposed downstream from a switch valve.
  • the throttle valve has been applied to a jet loom.
  • the present invention is not limited thereto. As long as pressure fluid is controlled for a flow rate, the present invention can be applied.
  • the present invention can be applied to general air transportation, fuel injection apparatus for automobiles, and the like.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP01125328A 2000-10-30 2001-10-26 Throttle valve and weft insertion apparatus in a jet loom provided with the same Expired - Lifetime EP1201805B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000329890 2000-10-30
JP2000329890A JP2002138349A (ja) 2000-10-30 2000-10-30 絞り弁及びエアジェット織機用絞り弁
JP2001123746A JP2002317350A (ja) 2001-04-23 2001-04-23 ジェットルームにおける緯入れ制御装置
JP2001123746 2001-04-23

Publications (3)

Publication Number Publication Date
EP1201805A2 EP1201805A2 (en) 2002-05-02
EP1201805A3 EP1201805A3 (en) 2003-05-07
EP1201805B1 true EP1201805B1 (en) 2006-08-23

Family

ID=26602998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01125328A Expired - Lifetime EP1201805B1 (en) 2000-10-30 2001-10-26 Throttle valve and weft insertion apparatus in a jet loom provided with the same

Country Status (4)

Country Link
EP (1) EP1201805B1 (zh)
KR (1) KR100433883B1 (zh)
CN (1) CN1311179C (zh)
TW (1) TW507033B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7526993B2 (en) 2005-07-25 2009-05-05 Smc Corporation Fluid pressure cylinder apparatus having throttle valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2345756A1 (en) * 2010-01-18 2011-07-20 ITEMA (Switzerland) Ltd. Control unit for air supply in a relay nozzle of an air jet weaving loom
CN103410999A (zh) * 2013-05-22 2013-11-27 麦特汽车服务股份有限公司 一种流量调节阀对流量精细调节的实现方法
US9759335B2 (en) * 2014-05-01 2017-09-12 Dresser, Inc. Flow restrictor having multiple flow modifying regions
CN111853270A (zh) * 2020-08-06 2020-10-30 中建环能科技股份有限公司 一种气流调节阀门

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JPS596934B2 (ja) * 1978-02-10 1984-02-15 株式会社豊田自動織機製作所 ジエツトル−ムにおける補助ノズル給気方法及びその装置
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JPS5947055B2 (ja) * 1980-01-08 1984-11-16 日産自動車株式会社 流体噴射式織機の開閉弁
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US4644980A (en) * 1984-12-28 1987-02-24 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Device for inserting weft yarn in a fluid jet loom
CN1003873B (zh) * 1985-06-06 1989-04-12 株式会社丰田自动机械制作所 流体射流织机的引纬监测方法和装置
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JPH06306737A (ja) * 1993-04-19 1994-11-01 Toyota Autom Loom Works Ltd ジェットルームにおける緯入れ制御装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7526993B2 (en) 2005-07-25 2009-05-05 Smc Corporation Fluid pressure cylinder apparatus having throttle valve

Also Published As

Publication number Publication date
EP1201805A2 (en) 2002-05-02
CN1311179C (zh) 2007-04-18
KR100433883B1 (ko) 2004-06-04
CN1351235A (zh) 2002-05-29
KR20020033521A (ko) 2002-05-07
EP1201805A3 (en) 2003-05-07
TW507033B (en) 2002-10-21

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