EP0510735B1 - Vorfadenspeicher für Webmaschinen - Google Patents

Vorfadenspeicher für Webmaschinen Download PDF

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Publication number
EP0510735B1
EP0510735B1 EP92200596A EP92200596A EP0510735B1 EP 0510735 B1 EP0510735 B1 EP 0510735B1 EP 92200596 A EP92200596 A EP 92200596A EP 92200596 A EP92200596 A EP 92200596A EP 0510735 B1 EP0510735 B1 EP 0510735B1
Authority
EP
European Patent Office
Prior art keywords
winding
wheel
prewinder
weft thread
thread
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.)
Expired - Lifetime
Application number
EP92200596A
Other languages
English (en)
French (fr)
Other versions
EP0510735A1 (de
Inventor
Henry Shaw
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 EP0510735A1 publication Critical patent/EP0510735A1/de
Application granted granted Critical
Publication of EP0510735B1 publication Critical patent/EP0510735B1/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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins

Definitions

  • the present invention relates to a pre-winder for weaving looms, provided with a stationary winding drum, a rotary winding element and drive means intended to drive the winding element.
  • weft thread is removed from the bobbins and then, intermittently, it is inserted into the crowd of the weaving loom by means of weft insertion means. It is also known that a prewinder is placed between the coils and the weft insertion means.
  • a pre-winder of this type is generally constituted by a fixed winding drum, a winding arm and drive means intended to rotate the winding arm, the whole so that the winding of the weft thread on the winding drum is effected by the movement of the winding arm. The weft thread can then be removed from the winding drum intermittently.
  • the drawback associated with the use of the aforementioned pre-winders lies in the fact that the tension with which the windings are deposited on the winding drum varies according to the diameter of the coil, the fact that the resistance which is exerted when one pulls a wire of a reel, depends on the diameter of this last.
  • This characteristic in turn has the consequence that the resistance to be overcome in order to draw the weft thread from the winding drum also depends on the diameter of the coil.
  • this characteristic means that the time necessary for the insertion of a weft thread in the crowd also varies during weaving, which can give rise to weaving defects.
  • this characteristic also has the consequence that the length of the weft thread also varies during weaving, which can give rise to weaving defects, since this length is determined by the release of a certain number of windings and that it decreases as the aforementioned tension increases.
  • the subject of the present invention is a prewinder by which we exclude or limit to a minimum the disadvantages mentioned above.
  • the present invention relates, for this purpose, to a pre-winder which is designed to be placed between a reel and the weft insertion means of a loom, which has the advantage of ensuring that the tension is exerted on the weft yarn is small when spooled on the winding drum, that this tension is relatively constant regardless of the tension with which the weft yarn is drawn from the spool and that, therefore, speeds can be obtained weaving without running the risk of increasing yarn breakage and / or weaving defects.
  • the prewinder has a wire withdrawal element along the periphery of which the weft wire is guided before being conveyed to the winding element (3) and which is driven by the means. mentioned above.
  • the wire removal element is constituted by a wheel which makes it possible to exert a tensile force on the weft thread before routing this weft thread to the input of the winding element. In this case, the weft thread is guided along the surface of this wheel.
  • the wheel is driven so that, when the above-mentioned drive means are switched on, the peripheral speed of this wheel is greater than the speed at which the weft thread is spooled on the winding drum.
  • the wheel has a diameter which is greater than the diameter of the drum. winding.
  • a pre-winder 1 is mainly constituted by a fixed winding drum 2, a rotary winding element 3 and drive means 4, for example an electric motor, intended to drive the winding element 3.
  • drive means 4 for example an electric motor, intended to drive the winding element 3.
  • the weft thread 5 of the spool 6 is wound by means of the winding element 3 on the winding drum 2.
  • weft thread 5 is inserted, during weaving, intermittently, into the shed 7 of the loom, by means of weft insertion means 8.
  • weft insertion means 8 consist of a blower, as shown, for example, in FIG. 1.
  • the characteristic of the invention resides in the fact that the pre-winder 1 is equipped with a wire withdrawal element 10 driven by the drive means 4 and rotating jointly with the winding element 3.
  • This wire removal element 10 mainly consists of a wheel 11, all in such a way that the weft thread 5 is guided along the periphery of this wheel 11 before being routed to the inlet 12 of the winding element 3.
  • the pre-winder 1 In order to guide the weft thread 5 around the wheel 11 and then, in the direction of the entry 12, the pre-winder 1 is provided with various guides 13 to 17.
  • the guides 13 and 14 are preferably placed so that we guide the weft thread 5 around the wheel 11 over a distance ranging from three quarters of a turn to one turn.
  • the friction exerted between the weft thread 5 and the wheel 11 is greater than the sum of the frictions to which the weft thread 5 is subjected in the guides 13 to 17 and in the element of winding 3 itself.
  • the wheel 11 can be made of a suitable material.
  • the winding element 3 consists mainly of a winding arm 18 which is mounted on a shaft 19.
  • the shaft 19 is mounted on the frame 20 by means of bearings 21.
  • the winding drum 2 consists of a series of elements 22 distributed over the periphery, the latter forming a whole mounted on the shaft 19 by means of bearings 23.
  • the winding drum 2 is locked in rotation in a known manner, for example, by means of an oscillating element 24 mounted on the shaft 19, which, by its free ends, can cooperate with locking elements 25 which are mounted at remains in the frame 20.
  • the winding drum 2 can be fixed by means of magnets.
  • the aforementioned wheel 11 is mounted on the shaft 19 and is located at the height of the winding arm 18.
  • the diameter of the wheel 11 is greater than the diameter of the winding drum 2.
  • the wheel 11 is mounted at the height of the free end 26 of the winding arm 18.
  • the abovementioned guide elements 13 and 14 are formed, in the embodiment of the figure 2, by openings made in the frame 20.
  • the wire guide element 15 does not appear in the embodiment of FIG. 2.
  • weft thread 5 is guided around the wheel 11, when the drive means 4 are switched on, the weft thread 5 is taken up by its friction with the wheel 11 and removed from the spool 6.
  • the winding arm 18 takes less weft thread 5 than the quantity conveyed to the wheel 11.
  • the weft thread 5 is loosely arranged on the wheel 11, causing the wheel 11 to slide along the weft thread 5.
  • a balance is established, by which the thread weft 5 is removed from the spool 6 by the intervention of the wheel 11 and is deposited on the winding drum 2 by the intervention of the winding arm 18, with a well-defined speed.
  • the tension with which the windings are arranged on the winding drum 2 is lower than that which is encountered in the case of a wheel-free prewinder 11 and it is practically independent of the tension with which we draw the weft thread 5 from the spool 6.
  • a prewinder according to the invention offers the advantage that the spool 6, as shown in Figures 1 and 2, can be installed next to, below or above the prewinder 1, which allows to reduce the axial length of the assembly constituted by the prewinder 1 and the corresponding spool 6, compared to that which is encountered in conventional looms, so that the total length of the loom can be reduced .
  • the present invention is in no way limited to the embodiment described by way of example and shown in the figures; on the contrary, a prewinder of this type can be produced in different shapes and with different measures, without going beyond the ambit of the invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (9)

  1. Vorfadenspeicher für Webmaschinen, versehen mit einer festen Wickeltrommel (2), einem drehbaren Wickelelement (3) und Antriebsmitteln (4), die zum Antreiben des Wickelelements (3) bestimmt sind, dadurch gekennzeichnet, daß der Vorfadenspeicher (1) unter anderem ein Fadenabzugselement (10) aufweist, entlang dessen Umfang der Schußfaden (5) geführt wird, bevor er dem Wickelelement (3) zugeführt wird, und welches durch die vorgenannten Antriebsmittel (4) angetrieben wird.
  2. Vorfadenspeicher gemäß Anspruch 1, dadurch gekennzeichnet, daß das Fadenabzugselement (10) mit dem Wickelelement (3) mitdreht.
  3. Vorfadenspeicher gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Fadenabzugselement (10) hauptsächlich aus einem Rad (11) besteht.
  4. Vorfadenspeicher gemäß Anspruch 3, dadurch gekennzeichnet, daß, wenn die Antriebsmittel (4) eingeschaltet werden, das Rad (11) eine Umfangsgeschwindigkeit aufweist, die höher ist als die Geschwindigkeit, womit das Wickelelement (3) den Schußfaden (5) auf der Wickeltrommel (2) anbringt.
  5. Vorfadenspeicher gemäß einem der Ansprüche 3 und 4, dadurch gekennzeichnet, daß das Rad (11) einen Durchmesser aufweist, der größer ist als der Durchmesser der Wickeltrommel (2).
  6. Vorfadenspeicher gemäß einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß das Wickelelement (3) hauptsächlich aus einem auf einer Welle (19) montierten Wickelarm (18) besteht und daß das obenerwähnte Rad (11) auf dieser Welle (19) montiert ist, spezieller auf der Höhe des Wickelarms (19).
  7. Vorfadenspeicher gemäß Anspruch 6, dadurch gekennzeichnet, daß das Rad (11) sich auf der Höhe des freien Endes (26) des Wickelarms (18) befindet.
  8. Vorfadenspeicher gemäß einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß er eine bestimmte Anzahl von Führungselementen (13, 14, 15, 16, 17) aufweist, die gestatten, den Schußfaden (5) um das Rad (11) herum und anschließend in Richtung des Eingangs (12) des Wickelelements (3) zu führen.
  9. Vorfadenspeicher gemäß Anspruch 8, dadurch gekennzeichnet, daß er eine bestimmte Anzahl von Führungselementen (13, 14) aufweist, die gestatten, den Schußfaden (5) um das Rad (11) herum zu führen, über einen Abstand, der einer dreiviertel bis einer ganzen Umdrehung entspricht.
EP92200596A 1991-04-22 1992-03-02 Vorfadenspeicher für Webmaschinen Expired - Lifetime EP0510735B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9100374 1991-04-22
BE9100374A BE1004745A3 (nl) 1991-04-22 1991-04-22 Voorafwikkelaar voor weefmachines.

Publications (2)

Publication Number Publication Date
EP0510735A1 EP0510735A1 (de) 1992-10-28
EP0510735B1 true EP0510735B1 (de) 1995-10-25

Family

ID=3885460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200596A Expired - Lifetime EP0510735B1 (de) 1991-04-22 1992-03-02 Vorfadenspeicher für Webmaschinen

Country Status (3)

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EP (1) EP0510735B1 (de)
BE (1) BE1004745A3 (de)
DE (1) DE69205614T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6060447A (en) * 1987-05-19 2000-05-09 Chiron Corporation Protein complexes having Factor VIII:C activity and production thereof
DE59308414D1 (de) * 1992-12-03 1998-05-20 Iro Ab Verfahren zum steuern eines fadenliefersystems und fadenliefersystem

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280668A (en) * 1978-10-05 1981-07-28 Aktiebolaget Iro Thread-storage and delivery device for textile machines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911735B2 (de) * 1968-10-14 1971-11-11 Fadenspeicher und liefervorrichtung
DE3031260A1 (de) * 1980-08-19 1982-03-25 Sobrevin Société de brevets industriels-Etablissement, Vaduz Liefervorrichtung fuer laufende faeden

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280668A (en) * 1978-10-05 1981-07-28 Aktiebolaget Iro Thread-storage and delivery device for textile machines

Also Published As

Publication number Publication date
BE1004745A3 (nl) 1993-01-19
DE69205614D1 (de) 1995-11-30
DE69205614T2 (de) 1996-05-02
EP0510735A1 (de) 1992-10-28

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