EP1079009A2 - Vorrichtung und Verfahren zum Bilden einer Schnittleiste in einer Webmaschine - Google Patents

Vorrichtung und Verfahren zum Bilden einer Schnittleiste in einer Webmaschine Download PDF

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Publication number
EP1079009A2
EP1079009A2 EP00111570A EP00111570A EP1079009A2 EP 1079009 A2 EP1079009 A2 EP 1079009A2 EP 00111570 A EP00111570 A EP 00111570A EP 00111570 A EP00111570 A EP 00111570A EP 1079009 A2 EP1079009 A2 EP 1079009A2
Authority
EP
European Patent Office
Prior art keywords
selvedge
weave
yarns
parameters
moment
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Withdrawn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
EP00111570A
Other languages
English (en)
French (fr)
Other versions
EP1079009A3 (de
Inventor
Dario Pezzoni
Diego Poletti
Adriano Zenoni
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.)
Promatech SpA
Original Assignee
NUOVA VAMATEX SpA
Promatech SpA
SOMET Societa Meccanica Tessile SpA
Vamatex Nuova SpA
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 NUOVA VAMATEX SpA, Promatech SpA, SOMET Societa Meccanica Tessile SpA , Vamatex Nuova SpA filed Critical NUOVA VAMATEX SpA
Publication of EP1079009A2 publication Critical patent/EP1079009A2/de
Publication of EP1079009A3 publication Critical patent/EP1079009A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C11/00—Selvedge shedding mechanisms not forming part of main shedding mechanism

Definitions

  • the present invention concerns a device and a method to form the split selvedge in weaving looms, particularly gripper looms.
  • the split selvedge is used to keep the weft yarns tensioned during and soon after their insertion into the shed, and to allow a regular cutting thereof in order to produce fabrics having a uniform fringe of weft yarn tails.
  • a group of warp yarns forming the split selvedge is placed at the two sides of the normal warp yarns meant to form the fabric, and at a certain distance therefrom, thereby forming a lateral extension of the warp shed.
  • Such selvedge yarns are guided by means of at least two yarn-guide elements, which alternately move them in groups in opposite directions, so that said yarns - as an extension of the warp shed formed by the warp yarns meant to form the fabric - are apt to form a lateral warp shed which opens and closes, housing the ends of the weft yarns.
  • These last ones are then tied between the selvedge yarns according to a predetermined pattern, the so-called weave.
  • the split selvedge has been thus formed it is possible, by acting thereon with tensioning devices such as the templets, to proceed to the cutting of the weft yarns - in the zone between the fabric and the split selvedge, where no warp yarns are present - at the desired distance from the edge of the fabric, and while the weft yarns are perfectly tensioned; this allows to obtain a lateral fringe of weft yarn tails of perfectly uniform length, and thus particularly appreciated for the high finishing level conferred to the fabric.
  • tensioning devices such as the templets
  • the conventional devices to form the split selvedge are moved, through a synchronized mechanism, by the main motion of the loom.
  • This allows to accomplish certain types of weaves, for instance a one-one weave wherein a link is formed at each weft insertion, or else a two-two weave wherein a link is formed at each two successive weft insertions.
  • To change from one weave pattern to another it is necessary to replace some elements which operate the selvedge forming device - for instance the gearwheels - between the control lever and the main shaft of the loom. This replacement, besides involving a waste of time, forcedly requires to stop the loom thereby determining a slowing down of the production.
  • Such conventional devices equally allow, by adopting cam mechanisms, to form other weave patterns, for instance one-two weaves, wherein a first weft yarn is tied and the two subsequently inserted weft yarns are then tied together.
  • To change the preset weave pattern it is of course necessary to replace the cams of the mechanism, with the same inconveniences reported hereabove.
  • the yarn-guide elements are moved forward and backward between their end positions by means of the motors described in the aforecited patent applications. Since the movement of such motors is fully independent from the main motion of the loom, it is possible to vary the timing of said motors in respect of the main motion of the loom, so as to obtain any desired weave. For example, if the yarn-guide elements are moved by said motors forward and backward between their end positions at each weaving cycle, a one-one weave is formed in the split selvedge. Whereas, if the forward and backward movement of the yarn-guide elements is completed at each two or three weaving cycles, a two-two or three-three weave is formed. It is also possible to cause such motors to operate alternate cycles between those cited above, so as to obtain a relative motion of the yarn-guide elements apt to form weaves at will, for example a one-two or a one-three weave.
  • This second type of selvedge forming devices has thus proved to be more versatile.
  • Such devices are currently preferred also because, being free from any mechanical connection to the main motion of the loom, they can be easily mounted on a loom and removed again from the same. Furthermore, they can be applied on the frame of the loom, adjustable in respect of the loom width, so as to be used also in looms weaving fabrics of different widths, or more pieces of fabric.
  • the object of the present invention is to thus overcome the aforementioned drawback, by supplying a device and a method to form the split selvedge, which allows to tie all the wefts with the same tension so that the fringe of the fabric, once it has been removed from the split selvedge, turns out to be of a perfectly uniform length.
  • said object is reached by means of a device as in the characterizing portion of Claim 1, and by means of a method as in the characterizing portion of Claim 6.
  • Fig. 1 diagrammatically illustrates a weaving loom T, of the type with grippers P and a weft yarn presenting device S, meant for weaving two pieces of fabric C.
  • the top part of the loom comprises - fixed in an adjustable position to an upper crosspiece F of the loom - devices to form the split selvedge A and devices to form the leno heald weave B, all equipped with autonomous motor means, for example of the type described in the introductory part of the present description.
  • Each device to form the split selvedge A comprises at least one pair of yarn-guide elements, apt to move alternately and in opposite directions the warp yarns O A meant to form the split selvedge A, just as done by the heald frames in respect of the warp yarns O C meant to form the fabric C.
  • the selvedge forming devices operated by means of linear motors or step-by-step motors of the aforedescribed type, it is possible to cause the moment of mutual shifting of the selvedge yarns to coincide with a very precise time of the weaving cycle, not only in a constant manner for a specific fabric, but individually on each inserted weft, thereby allowing to obtain a punctual and precise control on the stopping modes of each single weft.
  • the logic functions of the loom are modified as per the block diagram of fig. 2.
  • the central processing and control unit U of the loom sends instructions to the weft presenting device S to select a special weft, it contextually provides to interrogate a parametric table R, previously stored into a storage area of the same unit U, obtaining therefrom a default value of the moment of mutual shifting of the selvedge yarns, which is most appropriate for that particular weft.
  • the parametric table R can, for example, be prearranged so as to contain all the possible sets of weaving parameters of the different wefts woven on the loom and of the different working conditions of the loom, associating to each of said sets a default value of the moment of mutual shifting of the selvedge yarns.
  • the moment of mutual shifting of the selvedge yarns can thus be adapted to any weaving cycle, according to the type of weft, to the way in which the weft is inserted, to the preset channel of weft insertion, to the weaving speed, and to other variable working parameters of the loom.
  • the parametric table R can be replaced by an appropriate algorithm which, on the basis of the weaving parameters concerning each single weft insertion, reckons each time the exact value of the moment of mutual shifting of the selvedge yarns.
  • said algorithm can be provided with self-learning functions - well known to a technician skilled in the art - so as to optimize the reckoned result according to the results previously obtained in the same parametric conditions.
  • the two systems can of course be combined, selecting the most appropriate mode for each weaving parameter to be placed under control.
  • the selvedge forming device also allows, with a fully similar logic, to modify the type of weave not only for each fabric being woven - as done so far in known technique - but also for each weft or group of wefts.
  • the selvedge forming device comprises more than two yarn-guide elements which, time after time, are controlled by a driving motor.
  • the selvedge forming device comprises more than two yarn-guide elements which, time after time, are controlled by a driving motor.
  • four yarn-guide elements can be provided which form each time a set of two yarn-guide elements moving in opposite directions. Each set is then controlled by an autonomous motor and by an autonomous drive shaft. This allows to form special weaves with more selvedge yarns.
  • the present invention has fully reached the intended object, namely to be able to control the final tension level of each single weft, by adjusting for each single weft the moment of mutual shifting of the selvedge yarns.
  • Such an adjustment can be carried out in any wanted manner, even by differentiating the closing times of the right-hand and left-hand selvedge of the fabric - always within the scope of the present invention - associating thereto also the most appropriate type of weave, without requiring any mechanical interventions or stops of the loom.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
EP00111570A 1999-05-31 2000-05-30 Vorrichtung und Verfahren zum Bilden einer Schnittleiste in einer Webmaschine Withdrawn EP1079009A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI991221 1999-05-31
IT99MI001221A ITMI991221A1 (it) 1999-05-31 1999-05-31 Dispositivo e metodo per la formazione della cimosa in un telaio di te ssitura

Publications (2)

Publication Number Publication Date
EP1079009A2 true EP1079009A2 (de) 2001-02-28
EP1079009A3 EP1079009A3 (de) 2001-05-30

Family

ID=11383095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00111570A Withdrawn EP1079009A3 (de) 1999-05-31 2000-05-30 Vorrichtung und Verfahren zum Bilden einer Schnittleiste in einer Webmaschine

Country Status (2)

Country Link
EP (1) EP1079009A3 (de)
IT (1) ITMI991221A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872653A (ja) * 1994-09-06 1996-03-19 Sensor Technol Kk エアバッグ装置
US5803133A (en) * 1995-05-29 1998-09-08 Picanol N.V. Selvage-forming device for a power loom
EP0878570A1 (de) * 1997-05-16 1998-11-18 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Bilden einer Gewebe- und Fangleistenkante bei der Herstellung eines Gewebes auf Webmaschinen und Vorrichtung zur Durchführung des Verfahrens
EP0893522A1 (de) * 1997-07-17 1999-01-27 NUOVA VAMATEX S.p.A. Vorrichtung zum Antrieb des Schlitzdreherlitzenmechanismus in Webmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872653A (ja) * 1994-09-06 1996-03-19 Sensor Technol Kk エアバッグ装置
US5803133A (en) * 1995-05-29 1998-09-08 Picanol N.V. Selvage-forming device for a power loom
EP0878570A1 (de) * 1997-05-16 1998-11-18 Lindauer Dornier Gesellschaft M.B.H Verfahren zum Bilden einer Gewebe- und Fangleistenkante bei der Herstellung eines Gewebes auf Webmaschinen und Vorrichtung zur Durchführung des Verfahrens
EP0893522A1 (de) * 1997-07-17 1999-01-27 NUOVA VAMATEX S.p.A. Vorrichtung zum Antrieb des Schlitzdreherlitzenmechanismus in Webmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07, 31 July 1996 (1996-07-31) & JP 08 072653 A (SENSOR TECHNOL KK), 19 March 1996 (1996-03-19) *

Also Published As

Publication number Publication date
EP1079009A3 (de) 2001-05-30
ITMI991221A1 (it) 1999-08-31

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