EP1233090A1 - Verfahren zur Überwachung des Betriebes einer Eintragsbremse - Google Patents

Verfahren zur Überwachung des Betriebes einer Eintragsbremse Download PDF

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Publication number
EP1233090A1
EP1233090A1 EP02075431A EP02075431A EP1233090A1 EP 1233090 A1 EP1233090 A1 EP 1233090A1 EP 02075431 A EP02075431 A EP 02075431A EP 02075431 A EP02075431 A EP 02075431A EP 1233090 A1 EP1233090 A1 EP 1233090A1
Authority
EP
European Patent Office
Prior art keywords
brake element
yarn
brake
movable
rest
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.)
Granted
Application number
EP02075431A
Other languages
English (en)
French (fr)
Other versions
EP1233090B1 (de
Inventor
Gijsbertus De Swart
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.)
Iro AB
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 EP1233090A1 publication Critical patent/EP1233090A1/de
Application granted granted Critical
Publication of EP1233090B1 publication Critical patent/EP1233090B1/de
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
    • 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
    • B65H59/28—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged towards each other
    • B65H59/30—Surfaces movable automatically to compensate for variation in tension
    • 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 method for monitoring the operation of an insertion brake suitable for being used between a yarn preparing device and a loom, comprising a movable brake element which is movable between a position of rest on one side of the yarn and a braking position on the other side of the yarn, wherein the brake element is coupled to an electric driving motor via a shaft.
  • An insertion brake of the kind to which the method according to the present invention relates is disclosed in the present applicant's International patent application WO 00/44970.
  • Said known insertion brake is used for decelerating the yarn that is unwound at high velocity from a yarn preparing device for a loom at very precisely determined points in time.
  • the movable element thereof which is usually in the form of an elongated arm or fork which is coupled to the shaft of the electric drive unit, is moved from a position of rest on one side of the yarn to a braking position on the other side of the yarn.
  • the object of the invention to provide a system for monitoring the operation of the insertion brake of a loom, in which a signal is generated which indicates whether the brake as such is still intact or not.
  • the method according to the invention is characterized in that the acceleration of the shaft and the parts connected thereto is determined with every stroke of the brake element, and if the measured value is higher than or lower than a specified value, a signal indicating this will be generated.
  • the brake element and the parts of the drive unit connected thereto have a specific mass, which is moved with a specific acceleration when a specific voltage is applied to the motor. If the acceleration value is found to be lower than a specified minimum value, this in fact signals that the brake is not operating properly.
  • the acceleration value of the brake element and the parts connected thereto is found to be higher than a specified value, this means that the acceleration is too high, which is normally a sign that the mass of the brake element has decreased, and that in all probability the brake element has fractured, therefore, as a result of which it can no longer function properly. If this happens, the loom will generate a specific signal, which either stops the loom or which signals to the user that something is wrong, so that the user can take adequate measures.
  • the determination of the acceleration value takes place by establishing the distance between the position of rest and the position of the brake movement at a specific point in time as well as the maximum current or the average current that occurs during the movement between the position of rest and the position at said specific point in time, after which the quotient of the distance travelled and the maximum current is determined and a signal will be generated if a specified value is exceeded.
  • a very good measure of the acceleration of the moving brake element is obtained, as will be explained in more detail hereinafter with reference to the drawing, and thus an adequate signal for determining whether the brake is properly functioning or not.
  • the aforesaid position at said specific point of time in the path of movement of the moving brake element lies before the position at which the brake element normally comes into contact with the yarn. In this way, the yarn is prevented from influencing the measurement of the acceleration value of the moving element, and only the acceleration value of the brake element itself is measured, without the yarn having any influence thereon.
  • the measured acceleration value may be too high, from which it can be concluded that the brake element has probably fractured or lost at least part of its mass, but the measured acceleration value may also be too low, which may be caused by fouling and/or wear, as a consequence of which the quality of the woven fabric will be poor.
  • a weft yarn 1 is fed from a supply drum 4, via an insertion brake 6, to a main injector 7.
  • the main injector 7 feeds the yarn 1 past scissors 8 to the shed 3 formed by the warp yarns 2, which has a width W.
  • the drawing furthermore shows that the compressed air pipe 11 is connected to a compressed air generator 16 via a pipe 15, whilst the drawing furthermore shows a drum 18 for the finished product, which drum is disposed between side walls 17.
  • the insertion brake 6 is built up of two fixedly disposed yarn guides 20, between which a movable brake element 21 is arranged.
  • the movable brake element 21 is connected to a driving device 23 via a lever 22.
  • the insertion brake 6 furthermore comprises a sensor 24 for sensing the instantaneous position of the movable brake element 21.
  • the loom furthermore comprises an electronic control device 25, which includes a programme section 26 in which at least one time-position programme for the movable brake element 21 is stored.
  • the position detection sensor 24 continuously transmits the sensed instantaneous position of the movable brake element 21 to the electronic control device 25 via line 27, which control device compares said instantaneous position with the desired position in programme section 26, after which, in case of a difference between the sensed instantaneous position and the desired position, the electronic device varies the excitation of the driving device 23 via line 28, in such a manner that the sensed difference is at least substantially eliminated.
  • a stop element 30 acts on the supply drum 4, which stop element is pushed against the supply drum surface at the end of the insertion process, that is, when the end of the weft yarn has reached the end of the shed, so that further unwinding of the yarn from the supply drum is stopped.
  • FIG. 2 One embodiment of an insertion brake which can be used in the loom according to Fig. 1 is shown in Fig. 2.
  • a lever 21 in the form of a fork is movable between two fixedly disposed yarn guides 20.
  • the lever 21 includes a block 31 on its other side, which is mounted on a shaft 32 of a solenoid motor 33.
  • the block 31 includes a magnet 34, which cooperates with a sensor 35.
  • a solenoid electric motor is used for driving the movable brake element 21 in this embodiment, it will be apparent that also other types of electric motors can be used, it is even possible to use hydraulic or pneumatic motors.
  • a first stroke-limiting stop 41 is disposed on one side of the movable element 21, and a second stop 42 is disposed on the other side thereof.
  • the position detection sensor 35 is furthermore connected to a schematically indicated electronic control device 25, which includes the aforesaid programme section 26 of the time-position programme as well as a control module 43 for adjusting the position of the position detection sensor 35 and a function verification module 44 for verifying the correct operation of the brake. Said verification does not comprise the detection of a possible change in the mass of the brake element, however, which might occur in case of fracture of the fork 21.
  • the function of the verification module has been extended in such a manner that said module will now also measure the acceleration value of the movable brake element 21, and if the measured acceleration value is higher than or possibly lower than a specified value, a signal will be generated which indicates that the brake is no longer functioning properly.
  • the movement of the brake element 21 starts from its position of rest P 0 at point in time t 0 until 1 its braking position P 2 at point in time t 2 .
  • the yarn position is indicated by dotted line G. If the mass inertia moment of the brake element 21 is high, i.e. normal, the brake element will follow the line 50 between P 0 and P 2 , which means that its position at point in time t 3 lies at point P 3 . If, in an extreme situation, a part of the arm 21 has broken off for some reason, the mass inertia moment thereof will have decreased considerably.
  • the distance between h 0 and h 3 is smaller than the distance between h 0 and h 3 ', which means that the quotient of said distances and the maximum current I max such as occurs in the range between t 0 and t 1 has become larger, and if this quotient exceeds a specified value, the module 44 will generate a specific signal, which either stops the loom or warns the user that something is wrong, so that the user can take adequate action. From the diagram it will be apparent that the range over which measuring takes place lies before the point at which the brake element has reached the yarn G. This means that the measurement is not influenced by the force which the yarn exerts on the brake element.
  • the maximum value of the current (I max ) has been used as the control magnitude. It is also possible to use the average value of the current (I avg ) while retaining the same operation and the same advantages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20020075431 2001-02-16 2002-02-01 Verfahren zur Überwachung des Betriebes einer Eintragsbremse Expired - Lifetime EP1233090B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1017378A NL1017378C2 (nl) 2001-02-16 2001-02-16 Werkwijze voor de functiebewaking van een inlooprem.
NL1017378 2001-02-16

Publications (2)

Publication Number Publication Date
EP1233090A1 true EP1233090A1 (de) 2002-08-21
EP1233090B1 EP1233090B1 (de) 2006-05-10

Family

ID=19772915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020075431 Expired - Lifetime EP1233090B1 (de) 2001-02-16 2002-02-01 Verfahren zur Überwachung des Betriebes einer Eintragsbremse

Country Status (3)

Country Link
EP (1) EP1233090B1 (de)
DE (1) DE60211233T2 (de)
NL (1) NL1017378C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019032007A1 (en) * 2017-08-08 2019-02-14 Iro Aktiebolag ADJUSTABLE WIRE BRAKE
EP3754069A1 (de) * 2019-06-17 2020-12-23 Vandewiele NV Schussfadenspannungsvorrichtung und verfahren zum betrieb der schussfadenspannungsvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467059A1 (de) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Vorrichtung zur Spannungsregulierung und Rückziehen von Schussgarn in Webmaschinen
DE4131656A1 (de) * 1991-09-23 1993-03-25 Iro Ab Verfahren und webmaschine
WO2000044970A1 (en) * 1999-01-29 2000-08-03 Te Strake B.V. Loom with an insertion brake

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467059A1 (de) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Vorrichtung zur Spannungsregulierung und Rückziehen von Schussgarn in Webmaschinen
DE4131656A1 (de) * 1991-09-23 1993-03-25 Iro Ab Verfahren und webmaschine
WO2000044970A1 (en) * 1999-01-29 2000-08-03 Te Strake B.V. Loom with an insertion brake

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019032007A1 (en) * 2017-08-08 2019-02-14 Iro Aktiebolag ADJUSTABLE WIRE BRAKE
EP3754069A1 (de) * 2019-06-17 2020-12-23 Vandewiele NV Schussfadenspannungsvorrichtung und verfahren zum betrieb der schussfadenspannungsvorrichtung
WO2020254091A1 (en) * 2019-06-17 2020-12-24 Vandewiele Nv Weft thread tensioning device and method of operating a weft thread tensioning device
CN113924390A (zh) * 2019-06-17 2022-01-11 范德威尔公司 纬纱张紧设备和操作纬纱张紧设备的方法
CN113924390B (zh) * 2019-06-17 2023-10-03 范德威尔公司 纬纱张紧设备和操作纬纱张紧设备的方法

Also Published As

Publication number Publication date
NL1017378C2 (nl) 2002-08-19
EP1233090B1 (de) 2006-05-10
DE60211233T2 (de) 2007-03-08
DE60211233D1 (de) 2006-06-14

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