EP0799340B1 - A device for controlling the movement of yarn and release means to be used in said device - Google Patents

A device for controlling the movement of yarn and release means to be used in said device Download PDF

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Publication number
EP0799340B1
EP0799340B1 EP95937213A EP95937213A EP0799340B1 EP 0799340 B1 EP0799340 B1 EP 0799340B1 EP 95937213 A EP95937213 A EP 95937213A EP 95937213 A EP95937213 A EP 95937213A EP 0799340 B1 EP0799340 B1 EP 0799340B1
Authority
EP
European Patent Office
Prior art keywords
yarn
annular element
annular
movable
movement
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
EP95937213A
Other languages
German (de)
French (fr)
Other versions
EP0799340A1 (en
Inventor
Joannes Josephus Henricus Marie Gorris
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.)
Te Strake BV
Original Assignee
Te Strake BV
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
Application filed by Te Strake BV filed Critical Te Strake BV
Publication of EP0799340A1 publication Critical patent/EP0799340A1/en
Application granted granted Critical
Publication of EP0799340B1 publication Critical patent/EP0799340B1/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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a device for controlling the movement of yarn between a stationary yarn package and a yarn-processing device having cyclic operation, said device including a winding drum comprising guide means, as well as yarn release means comprising a first annular element connected between said winding drum and said yarn-processing device.
  • a device of this kind is known from International Patent Application WO-84102361.
  • the yarn release means of said device consist of a circular plate secured to the winding drum, with spaces containing balls provided at the edge thereof. Said balls are retained within said spaces by permanent magnets. Electromagnets to be energized are positioned at some distance from the edge of said plate, said electromagnets functioning to draw out one of said balls. The result of said drawing out is that the yarn passing between said plate and said electromagnets is stopped.
  • a drawback of this known device is the fact that said stopping of the release cannot be controlled with sufficient precision. Another drawback is the fact that the known device exhibits reliability and wear problems. Furthermore the known device is costly.
  • the object of the invention is to provide a device which does not exhibit the aforesaid drawbacks.
  • a device according to the invention is characterized in that the yarn release means include a second annular element,
  • One of the first and second annular elements being movably arranged with respect to the other element and the movably arranged element being movable by means of electromagnets which are circumferentially positioned around the movable element, whereby the yarns move between said annular elements during operation of the device.
  • the gap can be closed at any desired position very quickly and accurate by moving one the annular elements radially.
  • the movable element is capable of a rotating as well as a radial movement with respect to the other annular element.
  • the two annular elements operate together as a rotating yarn release element. Due to the relative small mass of the movable element its movements can be controlled very accurately by the electromagnets.
  • One embodiment of a device according to the invention is characterized in that the position of the movable annular element is determined by a position sensor.
  • a position sensor consists of an optical sensor, by means of which the position of the movable annular element is determined.
  • a position sensor may also be in the form of a coil (flux measurement).
  • a position sensor consists of a force sensor, which force sensor may be in the form of strain gauges, by means of which it is also possible to determine the position, for example from the resultant of a number of measured forces.
  • One embodiment of a device according to the invention is characterized in that the device includes a control system for controlling the movement of yarn.
  • Figure 1 shows a first embodiment of a device 1 according to the invention.
  • the yarn 3 being fed is wound (by means of winding arm 4) on a winding drum 5 from a first side, said winding arm in principle being driven at the required speed by means of a motor.
  • the yarn 7 to be released is released to a weaving machine (not shown) from the second side of the winding drum via release means.
  • the diameter of the winding drum is substantially constant.
  • the yarn release means will release yarn.
  • the yarn 7 coming from the winding drum passes between a first annular element 9 and a second annular element 13, and eventually moves on to the weaving machine (not shown) as yarn 11.
  • the release of yarn is influenced by electromagnets 15, as a result of which the first annular element 9 moves within the second annular element 13 (see Figure 2 for a diagrammatic indication).
  • the first annular element 9 moves within the second annular element 13 in this embodiment.
  • a controllable space for the yarn is obtained, which makes it possible to control the speed and the amount of yarn to be released. Since only the first annular element moves in this embodiment, the reaction that occurs when the release of yarn is stopped is much quicker and more accurate than with the systems known so far.
  • Figure 3 shows a second embodiment of a device 1' according to the invention. Also in this device the yarn 3 is wound on a first side of the winding drum 5 and the yarn 7 is unwound on a second side.
  • the release means of this embodiment include a first annular element 9', which element does not move in this embodiment.
  • the electromagnets 15' draw the second annular element 13' towards one of the electromagnets, as a result of which the second annular element moves around the first annular element in this embodiment while releasing a predetermined amount of yarn in a controlled manner (for a diagrammatic indication refer to Figure 4).
  • the mass inertia is kept small by the manner in which the ring moves, so that a quick reaction to a stop command is obtained.
  • the location of the moving annular element can be determined by means of a position sensor, for example.
  • the position sensor may be an optical sensor, or for example a force sensor.
  • the force sensor may for example be in the shape of strain gauges.
  • the difference in diameter between the annular elements may be made adjustable in order to be able to adjust the release gap for the various types of yarn.
  • annular element for example a polygonal ring or an oval ring, may be made of a rigid material or of a flexible material.
  • the annular element may also be fitted with (additional) magnetic material.
  • the device may furthermore include means for preventing vibrations.
  • the movable annular element does not require axial support, as a result of which the annular element moves in a free-flying manner.
  • one embodiment may comprise means to effect this.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)

Description

The invention relates to a device for controlling the movement of yarn between a stationary yarn package and a yarn-processing device having cyclic operation, said device including a winding drum comprising guide means, as well as yarn release means comprising a first annular element connected between said winding drum and said yarn-processing device.
A device of this kind is known from International Patent Application WO-84102361. The yarn release means of said device consist of a circular plate secured to the winding drum, with spaces containing balls provided at the edge thereof. Said balls are retained within said spaces by permanent magnets. Electromagnets to be energized are positioned at some distance from the edge of said plate, said electromagnets functioning to draw out one of said balls. The result of said drawing out is that the yarn passing between said plate and said electromagnets is stopped.
A drawback of this known device is the fact that said stopping of the release cannot be controlled with sufficient precision. Another drawback is the fact that the known device exhibits reliability and wear problems. Furthermore the known device is costly.
Another device for controlling the movement of yarn is disclosed in the International Patent Application WO-A-93/25742, wherein a ring moves around the winding drum so as to release yarns. In this known device the movable ring is connected to and rotated by a crank mechanism in such a way that the ring is continuously at a certain point in contact with the winding drum. Due to the large total mass of the crank mechanisme and the ring, the movement of the ring cannot easily be controlled with the required accuracy.
The object of the invention is to provide a device which does not exhibit the aforesaid drawbacks. To that end a device according to the invention is characterized in that the yarn release means include a second annular element,
One of the first and second annular elements being movably arranged with respect to the other element and the movably arranged element being movable by means of electromagnets which are circumferentially positioned around the movable element, whereby the yarns move between said annular elements during operation of the device.
By using two annular elements it is possible to determine the amount of yarn to be released much more accurately, since the gap can be closed at any (desired) position.
In case the device is used with an annular gap between the two annular elements the gap can be closed at any desired position very quickly and accurate by moving one the annular elements radially.
In another embodiment of the device according to the invention, the movable element is capable of a rotating as well as a radial movement with respect to the other annular element. In this embodiment the two annular elements operate together as a rotating yarn release element. Due to the relative small mass of the movable element its movements can be controlled very accurately by the electromagnets.
One embodiment of a device according to the invention is characterized in that the position of the movable annular element is determined by a position sensor. One embodiment of a position sensor consists of an optical sensor, by means of which the position of the movable annular element is determined. A position sensor may also be in the form of a coil (flux measurement).
Another embodiment of a position sensor consists of a force sensor, which force sensor may be in the form of strain gauges, by means of which it is also possible to determine the position, for example from the resultant of a number of measured forces.
One embodiment of a device according to the invention is characterized in that the device includes a control system for controlling the movement of yarn.
Hereafter the device according to the invention will be explained in more detail by way of example with reference to the Figures, in which:
  • Figure 1 shows a first embodiment of a device according to the invention;
  • Figure 2 diagrammatically shows the first and the second annular element of Figure 1;
  • Figure 3 shows a second embodiment of a device according to the invention; and
  • Figure 4 diagrammatically shows the first and the second annular element of Figure 3.
    • Figure 1 shows a first embodiment of a device 1 according to the invention. In operation the yarn 3 being fed is wound (by means of winding arm 4) on a winding drum 5 from a first side, said winding arm in principle being driven at the required speed by means of a motor. The yarn 7 to be released is released to a weaving machine (not shown) from the second side of the winding drum via release means. The diameter of the winding drum is substantially constant.
    During the time that no yarn is to be released to the weaving machine the yarn is wound on the winding drum 5 from the first side. When yarn is to be fed to the weaving machine, the yarn release means will release yarn.
    In this embodiment the yarn 7 coming from the winding drum passes between a first annular element 9 and a second annular element 13, and eventually moves on to the weaving machine (not shown) as yarn 11.
    The release of yarn is influenced by electromagnets 15, as a result of which the first annular element 9 moves within the second annular element 13 (see Figure 2 for a diagrammatic indication).
    By placing a number of electromagnets around the second annular element, which electromagnets are energized in succession, the first annular element 9 moves within the second annular element 13 in this embodiment. As a result of this a controllable space for the yarn is obtained, which makes it possible to control the speed and the amount of yarn to be released. Since only the first annular element moves in this embodiment, the reaction that occurs when the release of yarn is stopped is much quicker and more accurate than with the systems known so far.
    Figure 3 shows a second embodiment of a device 1' according to the invention. Also in this device the yarn 3 is wound on a first side of the winding drum 5 and the yarn 7 is unwound on a second side. The release means of this embodiment include a first annular element 9', which element does not move in this embodiment. In this embodiment the electromagnets 15' draw the second annular element 13' towards one of the electromagnets, as a result of which the second annular element moves around the first annular element in this embodiment while releasing a predetermined amount of yarn in a controlled manner (for a diagrammatic indication refer to Figure 4). Also in this embodiment the mass inertia is kept small by the manner in which the ring moves, so that a quick reaction to a stop command is obtained.
    The location of the moving annular element can be determined by means of a position sensor, for example. The position sensor may be an optical sensor, or for example a force sensor. The force sensor may for example be in the shape of strain gauges.
    It will be apparent that the device can be modified in various manners without departing from the essence of the invention.
    Thus the difference in diameter between the annular elements may be made adjustable in order to be able to adjust the release gap for the various types of yarn.
    It will be apparent that the annular element, for example a polygonal ring or an oval ring, may be made of a rigid material or of a flexible material. The annular element may also be fitted with (additional) magnetic material.
    The device may furthermore include means for preventing vibrations.
    Furthermore it is possible to direct the respective annular element to a predetermined position by means of a measurement and control system (the so-called setpoint control), which position corresponds with the desired/required yarn feed characteristic.
    In principle the movable annular element does not require axial support, as a result of which the annular element moves in a free-flying manner.
    In order to ensure that the movable annular element runs true, one embodiment may comprise means to effect this.

    Claims (4)

    1. A device for controlling the movement of yarn between a stationary yarn package and a yarn-processing device having cyclic operation, said device including a winding drum (5) comprising guide means (4), as well as yarn (7) release means comprising a first annular element connected between said winding drum (5) and said yarn-processing device, characterized in that said yarn release means include a second annular element (13), one of the first and second annular elements (9,13) being movably arranged with respect to the other element and the movably arranged element being movable by means of electromagnets (15') which are circumferentially positioned around the movable element, whereby the yarn (7) moves between said annular elements during operation of the device.
    2. A device according to claim 1, characterized in that the movable annular element (9 or 13) is capable of a rotating as well as a radial movement with respect to the other annular element.
    3. A device according to claim 1 or 2, characterized in that the position of said movable annular element is determined by a position sensor.
    4. A device according to claim 1, 2, or 3, characterized in that said device includes a control system for controlling the movement of the yarn.
    EP95937213A 1994-12-20 1995-11-21 A device for controlling the movement of yarn and release means to be used in said device Expired - Lifetime EP0799340B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    NL9402159A NL9402159A (en) 1994-12-20 1994-12-20 Device for controlling a yarn run and release means for use in the device.
    NL9402159 1994-12-20
    PCT/NL1995/000395 WO1996019606A1 (en) 1994-12-20 1995-11-21 A device for controlling the movement of yarn and release means to be used in said device

    Publications (2)

    Publication Number Publication Date
    EP0799340A1 EP0799340A1 (en) 1997-10-08
    EP0799340B1 true EP0799340B1 (en) 1998-12-23

    Family

    ID=19865040

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95937213A Expired - Lifetime EP0799340B1 (en) 1994-12-20 1995-11-21 A device for controlling the movement of yarn and release means to be used in said device

    Country Status (6)

    Country Link
    EP (1) EP0799340B1 (en)
    JP (1) JPH10511438A (en)
    AU (1) AU3937995A (en)
    DE (1) DE69506915T2 (en)
    NL (1) NL9402159A (en)
    WO (1) WO1996019606A1 (en)

    Family Cites Families (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    SE8207098D0 (en) * 1982-12-10 1982-12-10 Iro Ab DEVICE FOR TEMPORES STORAGE AND FEEDING OF FOUND YARN LENGTHS, PREFERRED TO DISHWOVEN MACHINES
    DE3628485A1 (en) * 1986-08-22 1988-02-25 Iro Ab DEVICE FOR STORING YARN
    DE4219306A1 (en) * 1992-06-12 1993-12-16 Iro Ab Method and device for supplying weft threads

    Also Published As

    Publication number Publication date
    AU3937995A (en) 1996-07-10
    JPH10511438A (en) 1998-11-04
    EP0799340A1 (en) 1997-10-08
    WO1996019606A1 (en) 1996-06-27
    DE69506915T2 (en) 1999-05-12
    NL9402159A (en) 1996-08-01
    DE69506915D1 (en) 1999-02-04

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