EP0453012A1 - Fadenbremse - Google Patents

Fadenbremse Download PDF

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Publication number
EP0453012A1
EP0453012A1 EP91200672A EP91200672A EP0453012A1 EP 0453012 A1 EP0453012 A1 EP 0453012A1 EP 91200672 A EP91200672 A EP 91200672A EP 91200672 A EP91200672 A EP 91200672A EP 0453012 A1 EP0453012 A1 EP 0453012A1
Authority
EP
European Patent Office
Prior art keywords
wire
braking element
brake according
wire brake
braking
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Withdrawn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
EP91200672A
Other languages
English (en)
French (fr)
Inventor
Henry Shaw
Bertrand Desmet
Robert Baeck
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.)
Picanol NV
Original Assignee
Picanol NV
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 Picanol NV filed Critical Picanol NV
Publication of EP0453012A1 publication Critical patent/EP0453012A1/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Withdrawn legal-status Critical Current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
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • 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 thread brake, and more particularly to a thread brake for weaving machines.
  • the wire brake can be placed between a supply reel and a pre-deliverer near the entry of this pre-deliverer, in order to brake the weft thread at the entry of the pre-deliverer.
  • Such a wire brake can also be placed between a pre-feeder and the insertion means, more particularly near the outlet of the pre-feeder, in the purpose of allowing braking of the weft thread during insertion into the crowd.
  • wire brakes have the disadvantage of not being able to be threaded automatically using an air jet.
  • the present invention relates to a wire brake which does not have the disadvantage which has just been mentioned.
  • wire brake having different adjustment functions, in particular for adjusting the braking force and for suddenly increasing or decreasing this braking force according to a predetermined value, during use. wire brake.
  • the invention relates to a wire brake, characterized in that it consists of at least one wire guide intended for the routing of a wire; a first braking element; and a second movable braking element interacting with the first braking element, the second braking element occupying a determined position when it is at rest and creating a free passage situated in the extension of the thread guide mentioned above when moved.
  • the first braking element will preferably consist of a leaf spring or the like, while the second braking element consists of a cylindrical body, the leaf spring being mounted outside the extension of the thread guide mentioned above.
  • the advantage is obtained that the first braking element makes it possible to determine the braking force, while the second braking element makes it possible to create a free passage situated in the extension of the thread guide mentioned above.
  • FIG. 1 represents an assembly of a thread brake 1 intended to brake a thread 2, in this case, a weft thread lying between a supply reel 3 and a pre-delivery device 4 in a weaving machine.
  • the pre-delivery device 4 is composed here, according to a known principle, of a pre-delivery drum 5 and of a rotating winding tube 6.
  • a blower 8 placed such that a wire 2 presented in front of this inlet 7 can be automatically blown through the winding tube 6 when threading a new wire.
  • the end of the thread of a thread 2 coming from a supply reel 3 can be retained in the bobbin 9 by means of a suction device located in the bobbin 9 and can be blown at the desired moment from the bobbin 9 to the pre-delivery device 4 by means of a blowing device located in the bobbin 9.
  • the present invention relates to a wire brake 1 allowing easy transport of the wire 2 through the section mentioned above, preferably using an air jet, so that an automatic threading can have from the supply coil 3 to the pre-delivery device 4 or even to the outlet 10 of the pre-delivery device 4.
  • wire brake 1 described below can also be used in other arrangements.
  • the wire brake 1 essentially consists of a first wire guide 11 intended for the routing of wire 2, a first braking element 12, and a second braking element 13 movable and interacting with the first braking element 12; as will be explained in detail in the remainder of this description, the second braking element 13 occupies a determined position when it is at rest and creates a free passage situated in the extension of the first wire guide 11 mentioned above when it is out of place.
  • a second thread guide 14 will preferably be provided, mounted in such a way that when the thread brake 1 is in the open position, a free and straight passage is formed between the two thread guide 11 and 14, more particularly as shown in FIG. 6.
  • the second thread guide 14 does not have to belong directly to the thread brake 1, but can consist of an existing thread guide, for example the input 7 of the pre-delivery device 4.
  • the wire brake 1 is built mainly around a body 15.
  • the first wire guide 11 is then formed by a hole passing through this body.
  • the first braking element 12 is movable by elastic means and consists of a leaf spring or a similar member.
  • the second braking element 13 consists of a rigid element. It will preferably be formed of a cylindrical body 16 mounted on a lever 17, which can rotate along an axis 18 mounted in the body 15, this axis 18 being parallel to the line 19 connecting the two wire guides 11 and 14
  • the cylindrical body 16 is mounted on the lever 17 by means of a freewheel coupling 20, so that it cannot rotate in the direction of movement of the wire 2, while being able to rotate in the opposite direction of rotation.
  • the second braking element 13 is provided with means which, when this second braking element 13 is in the rest position, force it towards the first braking element 12; these means may for example be elastic means acting on the lever 17, directly or not. In the embodiment shown in Figure 7, these elastic means consist of a spring 21 acting on a second lever 22, permanently connected to the lever 17 via the axis 18 mentioned above.
  • the wire brake 1 also has drive means making it possible to open the wire brake 1.
  • these drive means consist of a pneumatic cylinder 23 capable of exerting on the second lever 22 a force opposite to the force of the spring 21.
  • the jack 23 interacts here with the end of the second lever 22, which is opposite the end on which the spring acts 21.
  • the jack 23 is actuated by a pipe 25 connected to a source of compressed air 24 and comprising a valve 27 which can be opened and closed under the control of a control unit 26.
  • the wire brake 1 also has means which, when the wire brake is opened, generate an air jet F intended for the transport of the wire 2.
  • these means preferably consist of a blower 28, a pipe 29 between the source of compressed air 24 and the blower 28, and a valve 30 placed in the pipe 29, making it possible to supply an air jet to the blower 28 when the wire brake 1 is opened.
  • the valve 30 is preferably integrated in the body 15 and consists of a shutter member 32, adjustable by means of a second lever 22 overcoming the force of a spring 31 and having, for example, the shape of a needle capable of sliding in a bore 33.
  • the shutter member 32 makes it possible to shut off the pipe 29 and has an opening 34 which creates a free passage when the shutter member 32 is pressed.
  • the assembly according to FIG. 7 offers the advantage that the blowing begins after the opening of the wire brake 1, in other words, after the rotation of the lever 17.
  • the bore of the first wire guide element 11 opens into a wider channel 35.
  • the blower 28 mentioned above extends parallel to the bore of the first wire guide 11 and opens into the radial wall 36 forming the transition from the narrow section to the wide section.
  • the wire brake 1 is also provided with a wire detector 37 placed in the wall of the channel 35 mentioned above.
  • This wire detector 37 may consist of a piezoelectric element and is mounted in such a way that when the brake is in the closed position, the wire 2 is guided on this wire detector 37, more particularly as indicated in the figure. 4.
  • the wire detector 37 sends a signal to the control unit 26 making it possible to deduce the presence of wire 2.
  • a guide plate 38 can be mounted at the entry of the wire brake 1.
  • the second braking element 13 occupies a fixed position determined by a stop, formed in this case by the fact that the second lever 22 rests by one of its ends, and more particularly by the end on which can act the actuator 23, on a shoulder 39 or a similar part.
  • This shoulder 39 can also be replaced by an adjusting screw or the like.
  • the wire brake according to the invention incorporates various adjustment functions making it possible to adjust and modify the braking force.
  • the first braking element 12 is here mounted on an element 40 which can rotate in the body 15.
  • This rotary element 40 is made in the shape of a U and has at its two legs an end shaft 41 engaged in a bore 42 formed in an elastically folding blade 43, so that the element 40 can be easily assembled and disassembled.
  • the first braking element 12 is fixed by means of a welded connection 44 or a connection similar to a torsion element 45 fixed between the legs of the U-shaped rotary element 40.
  • the torsion element 45 consists of a wire stretched between two screws 46.
  • the wire brake 1 has means for adjusting the pressing force of the second braking element 13 on the first braking element 12.
  • these means consist, on the one hand , an adjustable stop 47, formed for example by an adjusting screw and, on the other hand, elastic means such as a pressure spring 48, these elastic means exerting on the element 40 a moment having a direction of rotation R , while the stop 47 limits this rotation to a given position.
  • the adjustable stop 47 and the pressure spring 48 interact here with the arms 49 and 50 projecting laterally from the element 40, so that a braking force is obtained which is all the greater when the adjusting screw is engaged further.
  • the leaf spring of the first braking element 12 bends only slightly or not at all and that, when the braking force is adjusted to a higher value, this is obtained mainly by the torsion of the torsion element 45. Due to the fact that the first braking element 12 is mounted on a torsion element 45, this first braking element 12 can be moved with great flexibility , even when using a leaf spring that bends only slightly or not at all.
  • the wire brake 1 according to FIGS. 2 to 9 also has controllable means making it possible to increase the braking force according to a predetermined value at desired times and during desired periods.
  • These controllable means consist of an electromagnetic device 51 comprising an armature 52 movable electromagnetically and provided with a needle 53 with the aid of which the element 40 can be moved at a given angle and preferably adjustable, overcoming the force exerted by the pressure spring 48.
  • the rotation of the element 40 is here determined by the trajectory of the armature 52, in turn determined by a stop 54 formed by the wall of the casing of the electromagnetic device 51.
  • the importance of the rotation of the element 40 following the movement of the needle 53 can be adjusted at will due to the fact that the stop 54 is adjustable, and more particularly by the fact that the housing 55 can be engaged more or less far in the body 15 by means of a thread 56.
  • a stop 57 can be provided if necessary on the body 15 and serving to prevent that, when the wire brake 1 is opened, the braking element 12 comes to be placed in the extension of the wire guide 11 mentioned above or in the path of the thread 2 to be threaded.
  • the braking force can be increased at any moment during the weaving process.
  • the two positions of the element 40 are shown in FIGS. 10 and 11.
  • FIG. 12 represents a schematic view of a variant provided with means making it possible to reduce the braking force by a determined value at any desired time and for an adequate period.
  • the pressure spring 48 and the stop 47 are mounted in such a way that the pressure spring 48 exerts on the element 40 a moment having a direction of rotation R opposite to that of FIG. 9.
  • the pressure spring 48 here exerts on the element 40 a moment such that, even when the brake is in the closed position, the rotation of the element 40 is limited by the stop 47.
  • the electromagnetic device 51 also acts in a contrary manner on the element 40 When the device 51 is actuated, the load on the torsion element 45 is reduced and the braking force decreases.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
EP91200672A 1990-04-17 1991-03-26 Fadenbremse Withdrawn EP0453012A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000424A BE1004140A3 (nl) 1990-04-17 1990-04-17 Draadrem.
BE9000424 1990-04-17

Publications (1)

Publication Number Publication Date
EP0453012A1 true EP0453012A1 (de) 1991-10-23

Family

ID=3884762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200672A Withdrawn EP0453012A1 (de) 1990-04-17 1991-03-26 Fadenbremse

Country Status (2)

Country Link
EP (1) EP0453012A1 (de)
BE (1) BE1004140A3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597239A1 (de) * 1992-11-09 1994-05-18 SOBREVIN Société de brevets industriels-Etablissement Fadenbremse
WO2006097168A1 (de) * 2005-03-15 2006-09-21 Iro Ab Fadenverarbeitungssystem und gesteuerte fadenbremse
EP1699724B1 (de) * 2003-12-31 2010-07-07 Iro Ab Fadenbremse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374451A1 (fr) * 1976-12-17 1978-07-13 Nissan Motor Dispositif de retrait de debris de fil dans un metier a tisser a jet d'air
FR2568565A1 (fr) * 1984-08-02 1986-02-07 Ppg Industries Inc Cadre de trempe a blocs segmentes, a cadres jumeles
DE8713749U1 (de) * 1987-10-13 1987-12-10 Elitex koncern textilního strojírenství, Reichenberg/Liberec Fadenbremse
GB2196994A (en) * 1986-11-06 1988-05-11 Dornier Gmbh Lindauer Weft thread brake
EP0384502A1 (de) * 1989-02-16 1990-08-29 Picanol N.V. Vorrichtung zum Bremsen eines Schussfadens in Webmaschinen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568595B1 (fr) * 1984-08-02 1986-09-05 Alsacienne Constr Mat Tex Dispositif de commande positive pour frein de fil.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374451A1 (fr) * 1976-12-17 1978-07-13 Nissan Motor Dispositif de retrait de debris de fil dans un metier a tisser a jet d'air
FR2568565A1 (fr) * 1984-08-02 1986-02-07 Ppg Industries Inc Cadre de trempe a blocs segmentes, a cadres jumeles
GB2196994A (en) * 1986-11-06 1988-05-11 Dornier Gmbh Lindauer Weft thread brake
DE8713749U1 (de) * 1987-10-13 1987-12-10 Elitex koncern textilního strojírenství, Reichenberg/Liberec Fadenbremse
EP0384502A1 (de) * 1989-02-16 1990-08-29 Picanol N.V. Vorrichtung zum Bremsen eines Schussfadens in Webmaschinen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0597239A1 (de) * 1992-11-09 1994-05-18 SOBREVIN Société de brevets industriels-Etablissement Fadenbremse
US5492286A (en) * 1992-11-09 1996-02-20 Sobrevin Societe De Brevets Industriels-Etablissement Thread brake
EP1699724B1 (de) * 2003-12-31 2010-07-07 Iro Ab Fadenbremse
CN1902114B (zh) * 2003-12-31 2011-08-31 Iro有限公司 纱线拉伸装置
WO2006097168A1 (de) * 2005-03-15 2006-09-21 Iro Ab Fadenverarbeitungssystem und gesteuerte fadenbremse
CN101160253B (zh) * 2005-03-15 2012-08-29 Iro有限公司 纱线加工系统和可控纱线制动器

Also Published As

Publication number Publication date
BE1004140A3 (nl) 1992-09-29

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