EP0942083A2 - Modulierte Schussfadenbremse für Textilmaschinen - Google Patents

Modulierte Schussfadenbremse für Textilmaschinen Download PDF

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Publication number
EP0942083A2
EP0942083A2 EP99103942A EP99103942A EP0942083A2 EP 0942083 A2 EP0942083 A2 EP 0942083A2 EP 99103942 A EP99103942 A EP 99103942A EP 99103942 A EP99103942 A EP 99103942A EP 0942083 A2 EP0942083 A2 EP 0942083A2
Authority
EP
European Patent Office
Prior art keywords
thread
braking
eyelets
movable yoke
coil
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.)
Withdrawn
Application number
EP99103942A
Other languages
English (en)
French (fr)
Other versions
EP0942083A3 (de
Inventor
Pietro Zenoni
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics SpA
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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0942083A2 publication Critical patent/EP0942083A2/de
Publication of EP0942083A3 publication Critical patent/EP0942083A3/de
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/13—Actuating means linear magnetic, e.g. induction motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a modulated weft thread braking device for textile machines.
  • the invention relates to a conventional braking device comprising two or more fixed and mutually spaced thread guiding eyelets, which trace a straight path for the thread through the braking device, and at least one braking element, which is actuated electrically and is adapted to engage the thread in the spaces between the thread guiding eyelets in order to deflect the thread from its straight path and produce the modulated braking thereof according to the breadth of the angles of deflection imparted to said thread.
  • These devices are typically interposed between the loom (or other textile machine) and the weft feeder, which is usually provided with a braking means of its own of the friction type, and are meant to eliminate the peaks of mechanical tension that the loom discharges onto the thread during its operation.
  • the modulated braking device in which the braking element is actuated with an excitation current variable according to the same criterion as the advancement speed or mechanical tension of the thread, so as to constantly adapt the braking action and maintain the mechanical tension of the thread substantially constant.
  • Another device actuates the braking element by means of an electromagnet provided with a movable keeper which, in addition to having a considerable mass, has a high mutual inductance coefficient. Both of these factors considerably delay the response of the device, eliminating the benefit of the greater electrodynamic force applied by the electromagnet to the braking element.
  • the aim of the present invention is accordingly to solve said drawbacks.
  • an important object of the present invention is to provide a modulated thread braking device of the specified type, with actuation means which are adapted to ensure the maximum response speed of the braking element, which in practice reacts without appreciable delay to variations in the advancement speed of the thread and accordingly in its mechanical tension.
  • Another object of the invention is to provide a modulated thread braking device of the specified type, with actuation means which are adapted to actuate the braking element with high intensity and accordingly to accelerate the braking element adequately in order to follow, without appreciable delays, variations in the speed and mechanical tension of the thread.
  • Another object of the invention is to provide a modulated thread braking device which has a simple structure and is reliable in operation.
  • the invention is based on the concept of providing a braking device with an actuation system which is extremely lightweight but at the same time capable of providing a substantial working force.
  • the system uses, for this purpose, a movable yoke which is subjected to the interacting actions of a magnetic field and of a current which circulates in an excitation coil.
  • the movable yoke has an actuation rod rigidly coupled thereto which actuates a first oscillating lever, whereto the braking element is rigidly coupled; said braking element is constituted by a second oscillating lever which is U-shaped and is adapted to straddle a central thread guiding eyelet which is interposed between two end thread guiding elements in order to engage the thread that slides within said eyelets, deflecting its path in the free portions that lie between the central eyelet and the end ones.
  • the movable yoke supports said excitation yoke, which is wound on a hollow cylindrical support and is placed in the field of a permanent magnet which generates a flux which circulates in a cylindrical jacket which surrounds the coil and is closed across an annular air gap on a cylindrical pivot which is slidingly contained in the cavity of the cylindrical support of said coil.
  • the movable yoke is constituted by at least one movable permanent magnet which replaces said actuation rod and moves in the cylindrical seat of the jacket of an electromagnet which is excited by at least one coil through which the corresponding excitation current flows.
  • the reference numeral 10 generally designates a braking device, which comprises a box-like body 11 with a cover 12, to the side of which there is a set of three thread guiding elements 13, 14 and 15 which are aligned, are mutually spaced by an extent t which has a convenient length, and trace a straight path of the thread F through the braking device 10.
  • a permanent magnet 16 ( Figure 3) which generates a magnetic flux which circulates in a cylindrical jacket 17 made of a material with very high magnetic permeance and closes across a cylindrical pivot 18 which is separated from the jacket 17 by an annular air gap TA.
  • a movable yoke 19 is fitted on the cylindrical pivot 18 so as to slide freely and comprises a hollow cylindrical support 20 made of electrically insulating material with a low relative density, for example cardboard, a mat of resin-impregnated fibers and the like, whereon an excitation coil 21 is wound.
  • a current I flows through the coil and can vary with a criterion which is equal to, and the inverse of, the criterion with which the advancement speed of the thread F varies.
  • the current I is generated in a known manner by a microprocessor (not shown) which receives in input a signal modulated by a movable element of the loom or, as an alternative, by a sensor for detecting the mechanical tension of the thread.
  • connection system uses a pair of strips 22 made of elastic material, for example the material known commercially as Kapton, on which a copper lamina a few hundredths of a millimeter thick is applied by electrolytic methods.
  • the strips have a substantial free length which significantly reduces stresses, which are mainly torsional, increasing the fatigue strength of the connection.
  • K electrodynamic force
  • L is the number of turns of the coil 21, which tends to move the yoke in an axial direction along the cylindrical pivot 18.
  • the actual braking element is rigidly coupled to the lever 24 and is constituted by a second U-shaped oscillating lever 27 which is adapted to straddle the central thread guiding element 14 in order to engage the thread F and deflect its path in the free portions that lie between the central eyelet and the end ones 13-15, as clearly shown in Figure 2.
  • the above-described system is extremely lightweight and follows without appreciable delay the variations in the excitation current I, modulating the braking action on the thread with corresponding larger or smaller deflections of the path of the thread applied by the oscillating lever 27.
  • the movable yoke is constituted by at least one permanent magnet, preferably two permanent magnets 190-191 shaped like cylindrical bars, for example made of neodymium, which are arranged end to end, replace the rod 23 and move in the cylindrical seat of the jacket 170 of an electromagnet which is excited by at least one coil, preferably two coils 210-211 arranged electrically in parallel and crossed by the excitation current I.
  • the magnet bar 191 has an end portion which passes through the cover 12 in order to be articulated to the lever 24 so as to move said lever.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP99103942A 1998-03-12 1999-03-08 Modulierte Schussfadenbremse für Textilmaschinen Withdrawn EP0942083A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO980207 1998-03-12
IT98TO000207A ITTO980207A1 (it) 1998-03-12 1998-03-12 Dispositivo di frenatura modulata del filato di trama per macchine tessili

Publications (2)

Publication Number Publication Date
EP0942083A2 true EP0942083A2 (de) 1999-09-15
EP0942083A3 EP0942083A3 (de) 1999-12-15

Family

ID=11416567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99103942A Withdrawn EP0942083A3 (de) 1998-03-12 1999-03-08 Modulierte Schussfadenbremse für Textilmaschinen

Country Status (2)

Country Link
EP (1) EP0942083A3 (de)
IT (1) ITTO980207A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6224009B1 (en) * 1998-07-17 2001-05-01 L.G.L. Electronics S.P.A. Device for modulated braking of a weft yarn for textile machines

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300161A (en) * 1963-09-21 1967-01-24 Frau Sigrid Heim Control device
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens
EP0467059A1 (de) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Vorrichtung zur Spannungsregulierung und Rückziehen von Schussgarn in Webmaschinen
EP0527510A1 (de) * 1991-08-13 1993-02-17 Picanol N.V. Fadenbremse
DE4335089A1 (de) * 1992-10-16 1994-04-21 Murata Machinery Ltd Verfahren und Vorrichtung zur Steuerung einer automatischen Wickeleinrichtung
DE19544202A1 (de) * 1995-11-28 1997-06-05 Schlafhorst & Co W Verfahren und Vorrichtung zum Spannen eines laufenden Fadens in einer Textilmaschine mittels eines Rechenspanners
WO1997049630A1 (en) * 1996-06-27 1997-12-31 Nuova Roj Electrotex S.R.L. Yarn brake for looms
EP0826806A1 (de) * 1996-09-03 1998-03-04 L.G.L. Electronics S.p.A. Schussfadenbremse insbesondere für Luftdüsenwebmaschinen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300161A (en) * 1963-09-21 1967-01-24 Frau Sigrid Heim Control device
EP0326784A1 (de) * 1988-01-15 1989-08-09 Gebrueder Loepfe Ag Verfahren zur Abbremsung eines laufenden fadenartigen Gebildes und Fadenbremse zur Durchführung des Verfahrens
EP0467059A1 (de) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Vorrichtung zur Spannungsregulierung und Rückziehen von Schussgarn in Webmaschinen
EP0527510A1 (de) * 1991-08-13 1993-02-17 Picanol N.V. Fadenbremse
DE4335089A1 (de) * 1992-10-16 1994-04-21 Murata Machinery Ltd Verfahren und Vorrichtung zur Steuerung einer automatischen Wickeleinrichtung
DE19544202A1 (de) * 1995-11-28 1997-06-05 Schlafhorst & Co W Verfahren und Vorrichtung zum Spannen eines laufenden Fadens in einer Textilmaschine mittels eines Rechenspanners
WO1997049630A1 (en) * 1996-06-27 1997-12-31 Nuova Roj Electrotex S.R.L. Yarn brake for looms
EP0826806A1 (de) * 1996-09-03 1998-03-04 L.G.L. Electronics S.p.A. Schussfadenbremse insbesondere für Luftdüsenwebmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6224009B1 (en) * 1998-07-17 2001-05-01 L.G.L. Electronics S.P.A. Device for modulated braking of a weft yarn for textile machines

Also Published As

Publication number Publication date
ITTO980207A1 (it) 1999-09-12
EP0942083A3 (de) 1999-12-15

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