EP0726343A1 - Frein de fil à arrêt amorti - Google Patents

Frein de fil à arrêt amorti Download PDF

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Publication number
EP0726343A1
EP0726343A1 EP95116089A EP95116089A EP0726343A1 EP 0726343 A1 EP0726343 A1 EP 0726343A1 EP 95116089 A EP95116089 A EP 95116089A EP 95116089 A EP95116089 A EP 95116089A EP 0726343 A1 EP0726343 A1 EP 0726343A1
Authority
EP
European Patent Office
Prior art keywords
extension
thread brake
functional
braking
particular according
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Withdrawn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
EP95116089A
Other languages
German (de)
English (en)
Inventor
Hans Rudolf Meyer
Alberto Gustavo Sarfati
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.)
Sobrevin Societe de Brevets Industriels
Original Assignee
Sobrevin Societe de Brevets Industriels
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 Sobrevin Societe de Brevets Industriels filed Critical Sobrevin Societe de Brevets Industriels
Publication of EP0726343A1 publication Critical patent/EP0726343A1/fr
Withdrawn legal-status Critical Current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
    • B65H2551/00—Means for control to be used by operator; User interfaces
    • B65H2551/20—Display means; Information output 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
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a thread brake according to the preamble of claim 1.
  • a thread brake in question is known from US Pat. No. 5,305,966.
  • the braking member is designed as a rotating finger with a reduced cross-sectional area, which can be moved back and forth between two pivot positions, with a different braking effect being achieved in the functional positions.
  • the braking effect can be completely canceled in a first functional position and the braking effect can be present in a second functional position.
  • a disk spring brake is also known from this patent, a disk spring being acted upon by a spring which is again tensioned by a spring tensioning element which can be moved back and forth between two functional positions in a manner that changes the braking action.
  • the invention is therefore based on the object of improving a generic thread brake to increase the functional speed.
  • the braking element can be moved back and forth faster between the two functional positions.
  • a stop is assigned to each of the two functional positions. So that the braking element does not rebound when the stop is reached, but remains there exactly for the duration of the functional position, movement damping of the fixed stop is provided.
  • This movement damping is preferably carried out by fluid damping. This damping changes its damping properties dynamically. At a high displacement speed, a correspondingly high damping effect occurs in order to remove the kinetic energy from the braking member or the braking member actuating means.
  • the thread brake is configured as described in US Pat. No. 5,305,966 with reference to FIGS. 1 to 8.
  • the braking element can be designed as a rotatable finger with different cross-sectional areas.
  • the different cross-sectional areas are distributed over different peripheral areas of the braking element.
  • the brake finger has a cylindrical outer contour in a cross-sectional area.
  • a window is incorporated into the brake finger in an area with reduced cross-section on the same circumferential line.
  • the brake finger works together with a leaf spring, which acts on the circumferential surface of the brake finger. If the area with reduced cross-section lies opposite the leaf spring, the thread can be pulled through the window without braking. In the other functional position, in which the area not reduced in cross-section is acted upon by the leaf spring, the thread is pressed by the leaf spring against the surface of the brake finger and thus braked.
  • the brake finger swings back and forth between two angular positions.
  • the brake finger sits on an axis and can be shifted by an electric motor, preferably by means of an initial pulse.
  • An extension can be arranged on the shaft, which cooperates with a fixed stop. If the extension runs onto the fixed stop, the rotation of the brake finger is stopped. Before the brake finger finally stops and stays in its functional position, the speed of rotation is reduced by damping, so that the speed of impact of the extension on the fixed stop is reduced.
  • the extension is preferably stored together with the fixed stop in a container which is at least partially filled with a viscous gas or a liquid.
  • the container preferably forms a chamber which is closed by the extension shortly before one of the two fixed stops is reached, so that the liquid or the gas in the chamber is compressed and thus leads to a reduction in movement. It is then preferably provided that the gas or the liquid escape from the chamber through openings, so that a disciplinary damping is achieved and a rebound of the extension at the fixed stop is prevented.
  • the openings are preferably formed by the gaps which the extension forms with the chamber wall.
  • the chamber content is preferably an oil.
  • the extension consequently forms a displacement body for the oil.
  • the thread brake is stopped, which is preferably operated in time with the weft entry of a weaving machine and is connected to it in a first functional position and receives a corresponding signal from the weaving machine, the shaft of the thread brake is briefly greatly accelerated by an electromagnetic pulse and then swings automatically due to the inertia up to in the second functional position. Shortly before reaching the second functional position, the damping occurs, so that the speed of rotation of the braking member is reduced and the braking member runs against the stop at a low speed and does not rebound there.
  • the braking member is first brought to a high angular velocity in the form of a pulse when it exits the first functional position.
  • the braking member rotates without drive over a certain angular range until shortly before reaching the second functional position.
  • the dynamic braking of the braking element sets in such a way that the braking element runs into the second functional position without rebounding.
  • the braking element can also be held by a magnetic force.
  • the holding force of the magnet and the damping are matched to one another in such a way that, despite the magnetic force acting in the direction of movement, there is no harmful ricocheting of the braking element from the second functional position, but on the other hand a secure fixation of the braking element in the functional positions is ensured.
  • the thread brake shown in the drawings has a motor housing 3, from which projects on one side a pin designed as a finger, which forms the braking element 1.
  • the finger 1 has an essentially cylindrical section, which forms two opposite windows, each of which is designed with a cross-sectional reduction.
  • a leaf spring 4 is provided which can be adjusted in its bearing tension on the cylindrical section of the finger 1 by adjusting the setting wheels 5, 6.
  • the contact force of the leaf spring 4 on the braking member 1 determines the braking force with which the thread which is pulled between the leaf spring 4 and the cylindrical surface of the braking member 1 is braked.
  • the thread is pulled through two opposite eyelets 7, 8, between which eyelets in alignment in one a further functional position of the braking member, there is a window when the area 2 of reduced cross section lies opposite the leaf spring 4.
  • the two functional positions are approximately apart by a swivel angle of 90 °.
  • the motor not shown, arranged in the motor housing 3 applies an electromagnetic pulse to the braking element 1, which is in a first functional position. This accelerates the braking member 1 briefly over a small swivel angle to a very high angular velocity, so that the braking member continues to rotate due to its inertia.
  • the damping begins, which is completed when a rotation position of 90 ° is reached, in which the rotary movement of the braking element 1 is limited by a stop.
  • the acceleration phase extends approximately over the angular range in which the damping takes place when entering the functional position, so that any damping that may occur when exiting the functional position is compensated for.
  • a damping device is provided on the thread brake, which is opposite to the braking element in the axial direction.
  • the motor housing 3 is therefore penetrated by a shaft 10 on which on the one hand the braking element 1 is arranged and on the other hand an extension 11 which interacts with stops 20, 21.
  • the extension 11 is designed as a displacement body, namely two oppositely.
  • the extension 11 is assigned to a separate extension carrier, which is connected by a wedge is rotatably connected to the shaft 10.
  • the extension 11 can be moved between two opposite chambers or niches 13.
  • the chambers 13 and the extension 11 are arranged in a closed container 12, which can be filled with an oil, another viscous liquid or a gas.
  • the niche 13 is delimited by a web 22 which is arranged between two niches 13.
  • a circumferential wall of the recess 13 is provided with the reference number 16.
  • the wall 16 is not fully closed circumferentially, but forms an opening.
  • the extension 11 with a side surface 11 ′′ abuts against a stop surface 20 of the web 22.
  • the radially outwardly projecting end surface 11 ′ lies opposite the inside 16 ′ of the wall 16, forming a thin gap.
  • the extension 11 is displaced out of the recess 13.
  • the damping agent an oil or the like
  • the damping agent flows through the gap between the end face 11 'and the side wall 16' into the recess 13.
  • the extension 11 is rotated so far that the recess 13 opens, the extension into the When the area of the breakthrough has reached, the movement-driving pulse ends.
  • the braking member 1 now only shifts due to its inertia (see FIG. 3).
  • the extension 11 After a further partial rotation, the extension 11 reaches the position shown in FIG. 7. An edge of the end face 11 'of the extension 11 now comes opposite to a side edge 16''of the wall 16. It forms there is now a gap between the side wall 16 'of the wall 16 and the end face 11' of the extension 11, through which the oil located in the recess 13 can escape. Due to the viscosity of the oil, it takes time and energy to flow out. The speed of the extension 11 and thus the shaft 10 and the braking member 1 is braked until the extension 11 abuts the stop surface 21.
  • the shaft on which the extension and the braking member is seated is the rotor of an electric motor in the exemplary embodiment.
  • the armature / magnets of the motor are arranged in such a way that in the functional positions the braking member is subjected to a holding force which holds the braking member in the functional positions.
  • the thread brake preferably runs synchronously with the weft insertion of a weaving machine. If the weft thread is drawn off by a thread supplier, the brake is in an open position, which enables the thread to be pulled out without braking. As soon as the thread withdrawal has ended, for example the projectile has reached the end of the compartment, the brake is shifted into the braking position (second functional position) at high speed, so that the thread is braked.
  • the control is preferably carried out by the weaving machine itself.
  • the container in which the extension and the chambers or niches 13 are arranged has a bottom and a lid that can be screwed to the floor.
  • the chamber walls 22 can form lugs 23 which engage positively in corresponding niches of the cover and thus seal the chambers.
  • Holes or openings 15 are provided in the bottom of the container. These bores 15 can be connected to one another in the form of an annular chamber below the bottom, so that the fluid can flow through these openings 15 when the extension 11 enters the recess 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Stepping Motors (AREA)
  • Braking Arrangements (AREA)
EP95116089A 1995-01-19 1995-10-12 Frein de fil à arrêt amorti Withdrawn EP0726343A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29500757U 1995-01-19
DE29500757U DE29500757U1 (de) 1995-01-19 1995-01-19 Anschlaggedämpfte Fadenbremse

Publications (1)

Publication Number Publication Date
EP0726343A1 true EP0726343A1 (fr) 1996-08-14

Family

ID=8002659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116089A Withdrawn EP0726343A1 (fr) 1995-01-19 1995-10-12 Frein de fil à arrêt amorti

Country Status (2)

Country Link
EP (1) EP0726343A1 (fr)
DE (1) DE29500757U1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561139A1 (fr) * 1992-03-16 1993-09-22 Gebrüder Loepfe Ag Dispositif de freinage de fil
DE4306911C1 (de) * 1993-03-05 1993-12-23 Dornier Gmbh Lindauer Schußfadenbremse mit steuerbarer Bremswirkung
US5305966A (en) 1991-07-22 1994-04-26 Sobrevin Societe De Brevets Industriels-Etablissement Device for the differential braking of traveling threads, wires or the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305966A (en) 1991-07-22 1994-04-26 Sobrevin Societe De Brevets Industriels-Etablissement Device for the differential braking of traveling threads, wires or the like
EP0561139A1 (fr) * 1992-03-16 1993-09-22 Gebrüder Loepfe Ag Dispositif de freinage de fil
DE4306911C1 (de) * 1993-03-05 1993-12-23 Dornier Gmbh Lindauer Schußfadenbremse mit steuerbarer Bremswirkung

Also Published As

Publication number Publication date
DE29500757U1 (de) 1996-05-15

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