EP1126062B1 - Method and device for forming the inset selvedge in air looms - Google Patents

Method and device for forming the inset selvedge in air looms Download PDF

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Publication number
EP1126062B1
EP1126062B1 EP01103476A EP01103476A EP1126062B1 EP 1126062 B1 EP1126062 B1 EP 1126062B1 EP 01103476 A EP01103476 A EP 01103476A EP 01103476 A EP01103476 A EP 01103476A EP 1126062 B1 EP1126062 B1 EP 1126062B1
Authority
EP
European Patent Office
Prior art keywords
weft
channel
shed
pneumatic means
receiving channel
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
EP01103476A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1126062A1 (en
Inventor
Giancarlo Oprandi
Boris Nettuno
Osvaldo Capitanio
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
Promatech 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 Promatech SpA filed Critical Promatech SpA
Publication of EP1126062A1 publication Critical patent/EP1126062A1/en
Application granted granted Critical
Publication of EP1126062B1 publication Critical patent/EP1126062B1/en
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
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the present invention relates to a method and.a device for forming the inset selvage in air looms and in particular to a device of this type operated pneumatically and devoid of movable parts.
  • the weft tail thus formed was sucked up inside a suction nozzle, the nozzle was displaced into a zone upstream of the weft insertion line and, finally, the weft tail was reinserted inside the shed, reversing the direction of the air flow inside the nozzle.
  • This solution has the advantage of providing excellent results from a weaving point of view, providing an inset selvedge free from defects and with a constant height, but has the drawback of the mechanical complexity required for nozzle displacements.
  • DE-A-725262 discloses a device for pneumatically forming an inset selvage, comprising a plurality of stationary nozzles which, through respective compressed blowing/suction air jets provide to reinsert the weft tails into the shed. This document has been considered as the closest prior art of the present invention and its features are reported in the introductory part of the independent claims 1) and 5).
  • the reinsertion of the weft tail in a zone upstream of the weft insertion line is a highly desirable procedure because in this zone the distance between the warp yarns is sufficiently high to ensure that 100% of the weft tails are reinserted correctly inside the shed. If operation takes place in the vicinity of the weft insertion line, as in fact occurs in EP-A-786,547, the distance between the warp yarns is very low and therefore there is the possibility - anything but infrequent - that weft tails may be reinserted outside the shed, i.e. above or below the warp yarns, so that they are not woven inside the fabric together with the following wefts, resulting in a defective fabric.
  • the object of the present invention is therefore that of providing a method and a device for forming the inset selvage in air looms, which are devoid of the drawbacks shown by the known selvedge forming devices and, therefore, in particular, which do not use moving mechanical parts, while allowing reinsertion of the weft tails in a zone upstream of the weft insertion line, and along a direction substantially parallel to said line.
  • EP-A-1088922 is an intermediate document according to art.
  • 54(3) and (4) EPC which discloses a device for pneumatically forming an inset selvage, comprising a plurality of stationary nozzles which, through respective blowing/suction compressed air jets provide to reinsert the weft tails into the shed after having transferred the same in a zone upstream of the weft insertion line.
  • the manufacturing of this device requires however the use of different nozzles and the separate feeding of said nozzles with respective air flows.
  • This method is preferably implemented using a device according to Claim 5.
  • fig. 1 is a schematic plan view of a loom incorporating four devices for forming the inset selvage according to the present invention
  • fig. 2A is a front perspective view of the device for forming the inset selvage according to the present invention.
  • fig. 2B is a perspective view, similar to fig. 2A, with parts partially removed, showing a first selvedge formation step;
  • fig. 2C is a perspective view, similar to fig. 2B, showing a second selvedge formation step
  • fig. 3A is a perspective view, from below, of the top part of the device for forming the inset selvage according to the present invention
  • fig. 3B shows, on a larger scale, the detail of the adjustable nozzle shown in Fig. 2C;
  • figs. 4A, 4B and 4C show three different operation steps of the device.
  • FIG. 2 The particular structure of the inset selvedge forming device according to the present invention is clearly shown in Fig. 2.
  • This device consists of a block of metallic material 1 formed by a top block 1s and a bottom block 1i, which are assembled together and fixed to the loom in a manner known per se, using screw means (not shown) after performing the necessary mechanical machining operations thereon. Once assembly has been performed, the block 1 appears as in Fig. 2A, while its internal structure, described in detail below, is illustrated in the split views according to Figs. 2B and 2C as well as in Figs. 3A and 3B.
  • the top block 1s has a first vertical through-channel 2 exactly crossing the weft insertion line L.
  • the channel 2 continues into a channel 3 aligned therewith and formed in the bottom block 1i.
  • the top block 1s also comprises other three vertical through-channels 4, 5 and 6, the axes of which lie in a vertical plane which is perpendicular to the weft insertion line L and positioned at a certain distance from the channel 2, towards the outside of the weaving zone, as can be seen in Figs. 2B and 3A.
  • the channel 4 is a smooth-wall channel, similarly to the former channels 2 and 3.
  • the channel 5 has an internal threading, inside which an adjusting screw 11 with a narrow-diameter central portion is engaged.
  • the channel 6 houses internally an adjustable nozzle 7, the structure of which will be described below, and is provided with end zones with a larger diameter which form the seats for respective sealing O-rings.
  • the channels 4, 5 and 6, finally, are connected together by a transverse channel 8, which channel also has smooth walls.
  • the outlet opening 10 may have any suitable shape in order to create an outlet air jet of the desired shape.
  • a preferred opening 10 has, for example, the shape of a slit, with the larger side arranged parallel to the warp yarns and with the internal walls flared in the form of a triangle, so as to form a fan-type air jet with the desired angular width.
  • the bottom part of the top block 1s is provided with recesses 12 and 13 for guiding the air flows, the function of which will become clear below.
  • the recess 13 is formed in an undercut zone 14 of the block 1s, suitable for allowing the weft yarn T to pass through the block 1.
  • the air flow to the channel 2 is interrupted and an air flow to the channel 4 is activated.
  • the compressed air introduced into this channel splits up at the channel 8 into two streams E and F; the distribution ratio of the streams E and F may be adjusted by operating the screw 11 which throttles, with its end, the flow of the stream E through the recess 12.
  • the compressed air flow E flowing out from the recess 12, interferes with the weft tail C housed inside the channel 3 and begins to transfer the same in a direction perpendicular to the weft insertion line L, i.e. towards a zone upstream of said line, until the weft tail C is positioned in front of the outlet opening 10 of the nozzle 7.
  • the walls of the recess 12 may be formed at the outlet so as to direct the flow E towards the common axis of the channels 2 and 3.
  • the compressed air flow F passes along the whole channel 8, enters into the channel 6 at the narrow-diameter zone 7a of the nozzle 7 and then, penetrating into the inlet openings 9 and into the internal cavity of the nozzle 7, emerges from the opening 10 exactly in the zone to which the weft end C has been transferred by the air flow E.
  • the flow F allows the said weft tail C to be reinserted inside the shed, as schematically illustrated in Fig. 4C and, in greater detail, in Fig. 2C, during the weaving step where in the reed P is moving back towards the beating-up zone.
  • the angular position of the nozzle 7 may be adjusted using an ordinary screwdriver inserted into an end notch 15, so as to obtain the desired direction of insertion of the end C, which is as parallel as possible to the weft insertion line.
  • the weft tail C is displaced by the air flow E from a position aligned with the weft insertion line L into a zone upstream thereof.
  • the insertion of the weft end by the compressed air flow F may be performed in this zone in a reliable manner and parallel to the weft yarns, owing to the fact that the warp yarns are here positioned at a greater distance from each other.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
  • Treatment Of Fiber Materials (AREA)
EP01103476A 2000-02-14 2001-02-14 Method and device for forming the inset selvedge in air looms Expired - Lifetime EP1126062B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI000241 2000-02-14
IT2000MI000241A IT1316367B1 (it) 2000-02-14 2000-02-14 Metodo per la formazione della cimossa rientrata in telai ad aria edispositivo per attuare detto metodo

Publications (2)

Publication Number Publication Date
EP1126062A1 EP1126062A1 (en) 2001-08-22
EP1126062B1 true EP1126062B1 (en) 2006-09-06

Family

ID=11444001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01103476A Expired - Lifetime EP1126062B1 (en) 2000-02-14 2001-02-14 Method and device for forming the inset selvedge in air looms

Country Status (6)

Country Link
EP (1) EP1126062B1 (it)
AT (1) ATE338840T1 (it)
DE (1) DE60122799T2 (it)
ES (1) ES2269237T3 (it)
HK (1) HK1039969A1 (it)
IT (1) IT1316367B1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4132793B2 (ja) * 2001-11-22 2008-08-13 津田駒工業株式会社 織布のタックイン耳形成方法
CZ2012797A3 (cs) * 2012-11-16 2014-03-05 Incot Spol. S R.O. Multifunkční zakládací tryska
JP7290983B2 (ja) * 2019-04-04 2023-06-14 津田駒工業株式会社 空気噴射式タックイン装置用のタックインヘッド

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725262C (de) * 1939-09-02 1942-09-18 Sulzer Ag Vorrichtung zum Herstellen fester Kanten bei Geweben
IT1251849B (it) * 1991-09-23 1995-05-26 Somet Soc Mec Tessile Metodo per la formazione della cimossa rientrata in telai senza navetta ed in particolare in telai ad aria e dispositivo per realizzare tale metodo
DE19548846C1 (de) * 1995-12-27 1996-10-10 Dornier Gmbh Lindauer Verfahren und Vorrichtung zum Einlegen eines Schußfadens

Also Published As

Publication number Publication date
ITMI20000241A1 (it) 2001-08-14
ATE338840T1 (de) 2006-09-15
EP1126062A1 (en) 2001-08-22
DE60122799D1 (de) 2006-10-19
IT1316367B1 (it) 2003-04-10
ES2269237T3 (es) 2007-04-01
ITMI20000241A0 (it) 2000-02-14
HK1039969A1 (zh) 2002-05-17
DE60122799T2 (de) 2007-09-13

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