Pneumatic Or Magnetic Patents (Class 242/419.3)
  • Patent number: 9080232
    Abstract: An electromagnetic vibration suppression device 1 includes a plurality of electromagnet pairs 2 (2A, 2B) disposed in the width direction of a steel sheet Sa. Each electromagnet pair is oppositely disposed in the thickness direction of the steel sheet Sa traveling in a predetermined direction. A control section 4 is adapted to control current to be applied to each electromagnet 2A, 2B to suppress the vibration of the steel sheet Sa traveling between electromagnets 2A and 2B. The control section 4 is arranged to determine an edge position Sae of the steel sheet Sa by computation based on an inputted width dimension of the steel sheet Sa and a meandering amount of the steel sheet Sa inputted therein, and separately control a current amount to be applied to the electromagnets 2A and 2B based on the edge position Sae of the steel sheet Sa.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: July 14, 2015
    Assignee: SINFONIA TECHNOLOGY CO., LTD.
    Inventors: Hisanori Ohara, Kazuhisa Matsuda
  • Publication number: 20150102153
    Abstract: The negative pressure roll 1 is provided with a rotating shaft 2, an internal cylinder 3, an intermediate cylinder 4 and a multi-layered non-woven fabric laminated outer layer 5. Further, the rotating shaft 2 is a member at the center of rotation of the negative pressure roll 1 and connected to the internal cylinder 3 by a reinforcement circular disk 9. Still further, the internal cylinder 3 is formed in a tubular shape and rotates together with the rotating shaft 2. In addition, the rotating shaft 2 and the internal cylinder 3 correspond to a rotating main body. Further, the intermediate cylinder 4 is a cylindrical tubular material formed outside the internal cylinder 3 and rotates in association with the rotating shaft 2 and the internal cylinder 3. Still further, the multi-layered non-woven fabric laminated outer layer 5 is formed outside the intermediate cylinder 4 and given as a part at which the negative pressure roll 1 is in contact with the metal strip 13.
    Type: Application
    Filed: February 6, 2013
    Publication date: April 16, 2015
    Applicant: JDC, inc.
    Inventors: Yoshito Hashikawa, Ryouta Ikeda
  • Patent number: 8616033
    Abstract: A method for vibration damping and shape control of a suspended metal strip is provided. The method includes the steps of: measuring distance to the metal strip by a plurality of non-contact sensors, providing distance measurements; generating a deflection profile based on the distance measurements; decomposing the deflection profile to a number of base shapes; and controlling the deflection profile by a plurality of non-contact actuators. The step of controlling includes providing for each of the base shapes a corresponding combination of force profiles.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: December 31, 2013
    Assignee: ABB Research Ltd.
    Inventors: Mats Molander, Robert Stal, Peter Rybing
  • Patent number: 8500056
    Abstract: A self-compensating tension control device for regulating the payout of filamentary material from a spool includes a fixed support and a spindle assembly rotatably carrying the spool. A tension force applied to the filamentary material, in opposition to a biasing force, moves the spindle assembly linearly in relation to the fixed support. An eddy current braking system includes a conductive member rotatable with the spindle assembly and a magnetic member carried by the fixed support. The spindle assembly and the conductive member move linearly toward a side-by-side relationship with the magnetic member when the tension force applied to the filamentary material is reduced and unable to overcome the biasing force. Linear movement of the spindle assembly and the associated conductive member can be obtained by either a straight line mechanism or a linear ball bushing mechanism. A supplemental brake may also be used.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: August 6, 2013
    Assignee: RJS Corporation
    Inventor: Raymond J. Slezak
  • Patent number: 8403251
    Abstract: A filament winding apparatus detects that a fiber bundle is likely to break and prevents generation of defective products. The filament winding apparatus applies a prescribed winding tension to the fiber bundle unwound from a fiber bundle feeding package and winds the tension-applied fiber bundle around a mandrel. A tension applying portion applies the winding tension to the fiber bundle at a position that is immediately before a side of the mandrel between the fiber bundle package and the mandrel. A tension sensor detects the tension of the fiber bundle between the fiber bundle feeding package and the tension applying portion. A determination means determines a tension abnormality of the fiber bundle by comparing pre-set reference information with the tension measured value measured by the tension sensor.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: March 26, 2013
    Assignee: Murata Machinery, Ltd
    Inventors: Tadashi Uozumi, Motohiro Tanigawa
  • Patent number: 8393369
    Abstract: A labeling machine for labels printed on continuous film, comprising, in an intermediate position between a motorized reel and a feed roller, a tunnel provided with suction elements adapted to determine on the film in transit inside it an attraction that gives it a bent configuration, elements being provided which are adapted to control the depth of the bend, the tunnel being provided with a bottom and a lid that are adapted to align the film at a constant height.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: March 12, 2013
    Assignee: P.E. Labellers S.p.A.
    Inventor: Mario Ballarotti
  • Patent number: 8119055
    Abstract: A method and an apparatus for corrugating and winding up rolls of a plastic film. The plastic film is corrugated as it is continuously wound onto a roll, by a film drawing drum conformed with a plurality of longitudinally extending grooves to perform open-end corrugation or folds which extend crosswise the film; the plastic film is corrugated crosswise, causing the same film to penetrate into the grooves of the drawing drum by suction of air through a plurality of suction holes which open out into the grooves of the drum.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: February 21, 2012
    Assignee: NO. EL. S.R.L.
    Inventor: Roberto Pellengo Gatti
  • Publication number: 20110204175
    Abstract: The present invention relates to a transfer device that can feed a work in a stable condition without applying it any excess loads. The transfer device for feeding a tape-shaped work to a process stage standing in an upright position, which is placed on one side of the process stage and which includes a supply reel, a take-up reel and a work feeding mechanism. Specifically, the supply reel, around which the work and a protective sheet are wound, is adapted to feed the work and the protective sheet therefrom. The take-up reel is adapted to wind the work and the protective sheet that have been fed from the supply reel, and it is located below the supply reel. The work feeding mechanism is adapted to forward the work from the supply reel to the take-up reel through the process stage.
    Type: Application
    Filed: May 6, 2011
    Publication date: August 25, 2011
    Applicant: ORC Manufacturing Co., Ltd.
    Inventors: Jin SATO, Akira NAKAZAWA
  • Patent number: 7913944
    Abstract: A cable brake system for deployments of cable comprising: a frame configured to be mounted on a ship; a repeater supporting track mounted longitudinally to the frame, the supporting track being configured for slidingly supporting a plurality of repeaters; a spool positioned exterior to the frame, the spool having the cable wrapped therearound and being capable of supplying the cable to an interior of the frame; at least one planar surface on an interior of the frame, the planar surface being positioned approximately parallel to the repeater supporting track; and a plurality of brake sub-assemblies being supported by the planar surface in a manner so as to establish a serpentine path for the cable and to impart variable frictional resistance to the cable.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: March 29, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Tammy Lombardi, Jeff GilChrist, Aaron Bratten, Lynn Collins, Steve Whiteside, Frank Gonzales, Kristin Smith
  • Patent number: 7896279
    Abstract: A yarn braking device includes a braking body with the shape of a frustocone coat. The braking body is put over a rounded withdrawal end of a storage body and is pressed from the small diameter end by a resilient axial force against the withdrawal end. The axial force defines the braking effect between the braking body and the withdrawal end. Between a stationary holder and the braking body an axial force generator and a centering device acting in radial direction are provided. The axial force generator is formed by at least one pair of permanent magnets. The permanent magnets are axially aligned by the centering devices with an intermediate gap. The centering device neither is an axial sliding guiding system structurally and functionally separated from the pair of permanent magnets, or is formed free of contact directly by the pair of permanent magnets, respectively.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: March 1, 2011
    Assignee: IRO AB
    Inventors: Renato Comotto, Kurt Arne Gunnar Jacobsson
  • Patent number: 7887001
    Abstract: An elastomeric fiber can be easily unwound from a package by way of using an OETO unwinding device which comprises a fiber package, a standby package and a static guide such that the distance from the inlet orifice of the static guide to the center of the static guide-facing side of the fiber package is in the range of 25 to 38 cm, and the distance (R) between the centers of the static guide-facing sides of the fiber package and standby package is in the range of 25 to 50 cm.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: February 15, 2011
    Assignee: Hyosung Corporation
    Inventors: Keon Yong Yoon, Yeon Soo Kang, Seung Won Seo
  • Patent number: 7874507
    Abstract: A system and method of modulating tape tension during operation of a tape drive data storage system in which a fixed position tape guide utilizes one or more drag elements to exert a control force on a tape medium that affects downstream tape tension. Drag elements that may be used include, but are not necessarily limited to, air ports that delivery positive or negative air pressure to the tape medium, skiving edge elements that are positionable into and out of engagement with the tape medium, and brakes or motors that engage the tape guide (if it is rotatably mounted) to control its rotational torque. A tension control circuit is used to vary the operation of the one or more drag elements. Signal inputs to the control circuit are provided by a tape tension sensor adjacent to or incorporated in the tape guide.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: January 25, 2011
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czamecki
  • Publication number: 20100224715
    Abstract: A device for supplying a wire from a wire roll to a capillary of a wire bonder comprises a holder, driven by a motor, for a wire roll and a wire store. The wire store comprises a plurality of channels that can be loaded with compressed air and the exit apertures of which are located on a circular arc and span a predetermined angle range and which run in a substantially radial direction with respect to the center of the circular arc, in order that the wire runs substantially along a circular path within the predetermined angle range.
    Type: Application
    Filed: June 4, 2007
    Publication date: September 9, 2010
    Applicant: OERLIKON ASSEMBLY EQUIPMENT AG, STEINHAUSEN
    Inventor: Armin Felber
  • Patent number: 7661621
    Abstract: The invention relates to a thread tensioner comprising tensioning elements that define a thread tensioning zone. In said tensioner, the first tensioning element rests on a stop and the second tensioning element can be pressed against the first tensioning element by means of an adjustable magnet contact force produced by a magnet armature and a repelling magnet actuator. The stop is located on the opposite side of the thread tensioning zone from the first tensioning element. The first tensioning element is stressed by a spring force in the direction of the second tensioning element against the stop. Said spring force is greater in the thread tensioning zone than the respectively adjusted maximum magnetic contact force. The mass of the first tensioning element is smaller than the mass of the magnet armature.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: February 16, 2010
    Assignee: IRO AB
    Inventor: Renato Comotto
  • Patent number: 7611087
    Abstract: A method and an apparatus f or winding careless and soft-core rolls (11), of film materials (10). The film (10) is made to advance, at differentiate speeds (S1, S2), between a first and a second drawing unit (12, 21) making the film (10) to perform a floating loop (19). The film (10) is fed in a controlled way, making it adhere to a grooved corrugating drum (22) by an air jet (29) to corrugate cross corrugations in the film (10) while it is being wound up; the corrugations of the film (10) traps air and prevents the implosion of the roll (11). A programmable electronic unit (32), controls the drawing units (12, 21) in relation to control signals (E1, E2) related to the feeding and winding up speeds (S1, S2) of the film (10), and in relation to a control signal supplied by a sensing device (28) for detecting the position of the floating loop (19).
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: November 3, 2009
    Assignee: No.El. S.r.l.
    Inventor: Roberto Pellengo Gatti
  • Publication number: 20090026303
    Abstract: The method and unit for braking a metal strip (1), running off a wind-out coiler (2.1) in the form of a coil (1.1) and running onto a wind-on coiler (2.2) again, are to guarantee that a surface of the metal strip remains undamaged and a full effective braking force is exerted on the metal strip (1) by means of an eddy current brake (3.1) with a rotating magnet system (3.2). The above is achieved, whereby the braking force is exerted on the metal strip (1) by means of an induced counter-torque against a support bearing (4) to one side in a non-contact manner, whereby the support bearing (4) may be embodied as a counter roller (4.1).
    Type: Application
    Filed: December 6, 2005
    Publication date: January 29, 2009
    Inventors: Eckard Schmitz, Volker Wandelt
  • Patent number: 7467757
    Abstract: A system and method of modulating tape tension during operation of a tape drive data storage system in which a fixed position tape guide utilizes one or more drag elements to exert a control force on a tape medium that affects downstream tape tension. Drag elements that may be used include, but are not necessarily limited to, air ports that delivery positive or negative air pressure to the tape medium, skiving edge elements that are positionable into and out of engagement with the tape medium, and brakes or motors that engage the tape guide (if it is rotatably mounted) to control its rotational torque. A tension control circuit is used to vary the operation of the one or more drag elements. Signal inputs to the control circuit are provided by a tape tension sensor adjacent to or incorporated in the tape guide.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: December 23, 2008
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czamecki
  • Patent number: 7204401
    Abstract: A web material feeding apparatus has a suction plate 24 provided near an outlet of a reservoir box 2. The suction plate 24 can be shifted in the direction across a feeding path for tip paper C, by operation of a motor 76. The feeding apparatus also has a sensor unit 96 provided at the upstream side of a receiving drum 12. The sensor unit 96 supplies a detection signal to a controller 120. When the controller 120 detects meandering of the tip paper C on the basis of the detection signal supplied from the sensor unit 96, the controller 120 actuates the motor 76 to shift the suction plate 24 to thereby correct the meandering of the tip paper C.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: April 17, 2007
    Assignee: Japan Tobacco Inc.
    Inventors: Hisao Suzuki, Syozo Horikawa, Hiroshi Okamoto, Takayuki Irikura, Hiroyuki Yoshinari
  • Patent number: 7114674
    Abstract: An idler roll brake in a paper handing machine wherein the roll brake employs a brake shoe mounted to the roll end bearing. The brake shoe slides forward to bring the brake shoe against the interior surface of the roll. An electromagnet positioned external to and mounted closely spaced from the cylindrical shell the roll attracts a ferromagnetic armature or permanent magnet mounted to the brake to pull the brake shoe into engagement with the inner surface of the roll.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: October 3, 2006
    Assignee: Metso Paper, Inc.
    Inventors: Lawrence J. Fuchs, Michael J. Daul
  • Patent number: 7017849
    Abstract: An idler roll brake in a paper handing machine employs an electromagnet positioned close to the periphery all of the idler roll which interacts with and induces eddy currents a conducive roll and a gear shaped steel ring fitted within the conducive roll. The electromagnet is arranged transverse to the axis of the roll and has three poles. The gear-shaped steel ring forms opposite poles which are attracted to the poles of the electromagnet which bring the roll to complete stop. An alternative embodiment roll brake employs a brake shoe mounted to the roll end bearing. The brake shoe slides forward to bring the brake shoe against the interior surface of the roll. An electromagnet positioned beneath the roll attracts a ferromagnetic armature or permanent magnet mounted to the brake to pull the brake shoe into engagement with the inner surface of the roll.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: March 28, 2006
    Assignee: Metso Paper, Inc.
    Inventors: Lawrence J. Fuchs, Michael J. Daul
  • Patent number: 7007885
    Abstract: A reel assembly includes a reel having a magnet rim, turntable, magnetic key, and a wire feed tube. The reel is self starting and holds the feed wire upon the completion of winding.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: March 7, 2006
    Assignee: The Boeing Company
    Inventor: Richard J. Buckwitz
  • Publication number: 20040245364
    Abstract: The combination of a bobbin assembly and a support for the bobbin assembly. The bobbin assembly has a core around which a supply of thread can be wrapped. The core has a rotational axis. The bobbin assembly further has a first flange with first and second oppositely facing surfaces, with the first surface bounding a storage space for thread wrapped around the core. The support allows the bobbin assembly to rotate around the rotational axis. The support has a third surface facing the second surface with the bobbin assembly operatively connected to the support. The bobbin assembly and support are magnetically attracted to each other with a force of a first magnitude with the bobbin assembly and support in a first state. The force resists rotation of the bobbin assembly around the rotational axis.
    Type: Application
    Filed: June 6, 2003
    Publication date: December 9, 2004
    Inventor: Ronald Kronenberger
  • Patent number: 6659384
    Abstract: A pre-wound bobbin for sewing, having a single flange or a pair of flanges, in which one flange of the bobbin comprises a magnetized material such that the flange magnetically adheres to the end wall of a steel bobbin case in which the bobbin is carried in a sewing machine. The flange is sized to provide a contact area with the end wall that, in relation to the magnetic strength of the magnetized material, achieves a magnetic attraction force exceeding the weight of the bobbin so that the bobbin is held in the bobbin case. The flange preferably is flexible.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: December 9, 2003
    Assignee: J. & P. Coats Limited
    Inventors: Dennis A. Milanese, William C. Stuckey, Michael W. Moennig
  • Publication number: 20030080230
    Abstract: Method of and apparatus for feeding string involving entertainment of the string around two godet rolls, driving one or both rolls in the direction for feeding the string forward, retarding the forward feed upstream from the rolls and accelerating the feed downstream from the rolls by blowing air on the string.
    Type: Application
    Filed: October 26, 2001
    Publication date: May 1, 2003
    Applicant: Kimberly-Clark Worldwide, Inc.
    Inventor: Gregory J. Rajala
  • Patent number: 6511012
    Abstract: An apparatus for controlling the tension of a traveling yarn includes a rake tensioner having stationary and displaceable yarn tensioning elements in engagement with the traveling yarn, and an electrical coil to which electrical current is supplied by a regulating device. The displaceable yam tensioning elements and the electrical coil are disposed on a common pivot lever. The electrical coil is pivotable in an air gap through which magnetic field lines pass. The tension of the traveling yarn is controlled as a function of the current supplied to the electrical coil. The present invention, thusly, improves the control of the tension of the traveling yarn in spinning or bobbin winding machines.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: January 28, 2003
    Assignee: W. Schlafhorst AG & Co.
    Inventors: Ferdinand-Josef Hermanns, Franz-Josef Flamm, Christian Sturm
  • Patent number: 6499641
    Abstract: A rope system includes an endless rope, a measuring device and a rope cutter. The endless rope is configured to travel through a machine, while the endless rope is under tension. The measuring device is used to measure the tension in the endless rope. The rope cutter is positioned to sever the endless rope if the tension exceeds a predetermined value.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: December 31, 2002
    Assignee: Voith Paper Patent GmbH
    Inventor: James Dadd
  • Patent number: 6471153
    Abstract: The present invention relates to an apparatus for controlling vibration of steel sheet being processed in a processing line. The apparatus includes: electromagnet devices for generating magnetic forces acting at right angles on the steel sheet; sensor devices for detecting separation distances between the steel sheet and the electromagnet devices; control devices for controlling a flow of excitation current through the electromagnet devices according to separation distances detected by the sensor devices; and actuator devices for adjusting the separation distance between the steel sheet and the electromagnet devices; wherein the actuator devices adjust the separation distance when a specific condition is attained in a positional relationship between the steel sheet and the electromagnet devices.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: October 29, 2002
    Assignee: Shinko Electric Co., Ltd.
    Inventors: Tetsuyuki Kimura, Yasushi Muragishi, Kazumichi Kato
  • Patent number: 6439488
    Abstract: A textile machine for processing yarn including a yarn tensioning device comprising a generally C-shaped frame having a generally vertical leg carrying generally parallel and horizontal arms in spaced positions along one side thereof each having a yarn guide. A pair of tensioning disks are rotably carried by the leg intermediate of the eyes. The disks are continuously urged into mutual contact. A mounting block is carried by the textile machine. A pair of connectors carried by the mounting block and frame are adapted to removably secure the frame with the mounting block. Yarn drawn through the tensioning device is maintained under proper tension as it passes through the disk while the disks are carried to rotate by movement of the yarn into the textile machine, which rotation frees the disks of lint thus maintaining uniform tension on the yarn.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: August 27, 2002
    Inventor: Bobby Hunter
  • Patent number: 6340129
    Abstract: A method for operating a work station (10) of a cheese-making textile machine. A work station computer (32) communicates with a tensile yarn force sensor (54) for monitoring the tensile yarn force of a yarn (22) traveling from a supply bobbin (12) to a takeup bobbin (14). A yarn tensioner (36) regulates the tensile yarn force of this yarn and a yarn cutting device (52) performs a controlled severing of the running yarn. According to the invention, the work station computer (32) predetermines the contact pressure (APD) of a yarn braking device (114, 116) of the yarn tensioner (36) acting on the yarn (22) in accordance with the tensile yarn force ascertained by the tensile yarn force sensor (54), compares the predetermined contact pressure (APDist) with a predetermined contact pressure value (APDmax), and interrupts the bobbin winding process if the limit value is attained or exceeded for a predetermined time period (t2−t1).
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: January 22, 2002
    Assignee: W. Schlafhorst AG & Co.
    Inventors: Rolf Haasen, Hans-Günter Wedershoven, Bernd-Rüdiger Theele
  • Patent number: 6286562
    Abstract: A weft brake for weaving looms, comprising a rigid, fixed and flat plate made of non-magnetic material and a flexible lamina made of magnetic material, between which a weft thread slides; the flexible lamina is actuated magnetically against the rigid and fixed plate by the action of a plurality of permanent magnets which are supported by a movable yoke; the yoke is subjected to an electric actuator which moves the yoke with respect to the lamina, moving the magnets towards or away from the lamina; due to this action, the attraction applied by the magnets to the lamina varies and accordingly varies the pressure that the lamina applies to the thread.
    Type: Grant
    Filed: September 25, 2000
    Date of Patent: September 11, 2001
    Assignee: L.G.L. Electronics S.p.A.
    Inventors: Pietro Zenoni, Giovanni Pedrini, Rosario Castelli
  • Publication number: 20010017331
    Abstract: An apparatus for controlling the tension of a traveling yarn includes a rake tensioner having stationary and displaceable yarn tensioning elements in engagement with the traveling yarn, and an electrical coil to which electrical current is supplied by a regulating device. The displaceable yarn tensioning elements and the electrical coil are disposed on a common pivot lever. The electrical coil is pivotable in an air gap through which magnetic field lines pass. The tension of the traveling yarn is controlled as a function of the current supplied to the electrical coil. The present invention, thusly, improves the control of the tension of the traveling yarn in spinning or bobbin winding machines.
    Type: Application
    Filed: February 28, 2001
    Publication date: August 30, 2001
    Inventors: Ferdinand-Josef Hermanns, Franz-Josef Flamm, Christian Sturm
  • Patent number: 6230616
    Abstract: A storage device for receiving a loop section of a flexible material web (8) moved in a conveying direction (18) between a feed area upstream of the storage device and a discharge area downstream thereof is described, the material web speeds at least periodically differing from one another in the feed area and the discharge area. The speed differences are compensated by a length change of the loop section stored in the storage device. On the feed side the storage device has a first pulling device formed by a suction belt (35, 55) and on the discharge side a separate, second pulling device formed by a parallel suction belt (35, 56). As a result of the parallel suction belts the drawn-in loop section is securely held by vacuum over most of its length, whereas between the pulling devices a tensile force-free loop partial section (4a) is moved to and fro in the store longitudinal direction with substantially no shape change in accordance with the store filling.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: May 15, 2001
    Inventor: Armin Steuer
  • Patent number: 6224009
    Abstract: Device for modulated braking of a weft yarn for textile machines, comprising a set of three yarn guiding eyes, which form a straight path for the yarn, and an oscillating lever, which is connected to a U-shaped braking, element which straddles a central eye of said eyes and engages the yarn in free portions that lie between said central eye and the end eyes of said eyes in order to divert its straight path for braking, wherein the oscillating lever is controlled by an electromagnetic actuation means which comprises at least one permanent magnet which is constituted by a cylindrical body having a N-S polar axis arranged radially; the body is associated with a stem which is articulated to the oscillating lever and can move in a linear fashion inside a cylindrical shroud with high magnetic permeance, on which at least one coil is wound, an excitation current flowing through the coil; is the axis of the cylindrical shroud, which coincides with the axis of the movable stem, being perpendicular to the polar axis of
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: May 1, 2001
    Assignee: L.G.L. Electronics S.p.A.
    Inventor: Pietro Zenoni