EP0465928A1 - Dispositif pour commander l'alimentation des tuyères transportant le fil de trame le long de la foule d'une machine à tisser à tuyères - Google Patents

Dispositif pour commander l'alimentation des tuyères transportant le fil de trame le long de la foule d'une machine à tisser à tuyères Download PDF

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Publication number
EP0465928A1
EP0465928A1 EP91110552A EP91110552A EP0465928A1 EP 0465928 A1 EP0465928 A1 EP 0465928A1 EP 91110552 A EP91110552 A EP 91110552A EP 91110552 A EP91110552 A EP 91110552A EP 0465928 A1 EP0465928 A1 EP 0465928A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
feeding
shed
solenoid valves
weft
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Withdrawn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
EP91110552A
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German (de)
English (en)
Inventor
Pezzoli Luigi
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.)
Vamatex SpA
Original Assignee
Vamatex 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 Vamatex SpA filed Critical Vamatex SpA
Publication of EP0465928A1 publication Critical patent/EP0465928A1/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Withdrawn legal-status Critical Current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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3053—Arrangements or lay out of air supply systems
    • 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply
    • D03D47/304—Controlling of the air supply to the auxiliary nozzles

Definitions

  • the present invention concerns a system to control the feeding of nozzles conveying the weft along the shed of fluid jet looms, said system allowing to vary the weft motion law along the shed by widening the range of adjustment and making it far more precise than with the conventional systems.
  • Fluid jet looms are well known and now widely diffused: the weft is fed therein and conveyed along the warp shed by means of fluid jets - especially air jets - blown by a main nozzle facing the inlet of the shed and by a set of secondary nozzles distributed along said shed and fed either singly or in groups.
  • each of said nozzles or groups of nozzles receives the fluid (air) required for its working from a duct controlled by a single solenoid valve, operated by the electronic devices provided to transfer the weft in synchronism with the other functions of the loom, as that of the sley and of the weave device.
  • Said solenoid valve receives air from a feeding system in which the pressure value can be varied manually or automatically by means of pressure regulators, in times which are considerably longer than the length of a blowing phase in each cycle of the same solenoid valve. Furthermore, said pressure regulators always control more than one solenoid valve and thus more nozzles or groups of nozzles.
  • the present invention proposes to reach both these objects with a system to control the feeding of nozzles conveying the weft along the shed of fluid jet looms, which allows to set the pressures and blowing times for each single nozzle or group of nozzles.
  • Said system is essentially characterized in that the feeding of the single fluid jet nozzles or groups of nozzles is controlled by means of at least two solenoid valves with mutually connected outlets, each of said valves being operated independently by an electronic device depending from the electronic system which controls the working of the loom.
  • the system is apt to control both the feeding of the main nozzle and that of the secondary nozzles or groups of nozzles of the loom.
  • the solenoid valves can be fed together from a common pressure source or, alternatively, in a separate way from different pressure sources.
  • the solenoid valves can be independently operated by said electronic device in times and for lengths of time which can be differently prearranged for each solenoid valve and for each type of loom operation, and which can even be varied for each working cycle.
  • the system according to the invention provides for each electronic device controlling single nozzles (as the main loom nozzle) or groups of nozzles (as the secondary nozzles) to use at least two solenoid valves, the capacity of which should be at least equal to that of the single solenoid valve of conventional devices, said solenoid valves having mutually connected outlets to feed the nozzle or groups of nozzles controlled by the device, and being in turn fed either separately or together (in this last case also their inlets are mutually connected).
  • the solenoid valves are chosen so that the single operation of only one of them does not allow to reach the top pressure value in the circuit downstream of said valve, in relation to a given inlet pressure Pi upstream thereof.
  • the top pressure value in the circuit downstream of the valves is meant to be reached only when all the valves are open.
  • Figure 1 shows a group G of three secondary nozzles 1, 2, 3, of a fluid jet loom; the group G is fed by a single duct 4 into which converge the outlets 5, 6, 7, of three solenoid valves 8, 9, 10, being in turn fed, at the same pressure Pi, from a reservoir 11 through the inlets 12, 13, 14.
  • Figure 2 shows instead two groups G1 and G2 of three secondary nozzles; the group G1 is fed by the solenoid valves 15, 16, 17, and the group G2 is fed by the solenoid valves 18, 19, 20, similarly to the group G of figure 1. Nevertheless, in this case, the valves are fed separately at different pressures - Pi1 for the valves 15 and 18, Pi2 for the valves 16 and 19, and Pi3 for the valves 17 and 20 - by way of ducts 21, 22, 23, controlled by pressure regulators 25, 26, 27.
  • the solenoid valves are operated by an electronic device DE, depending from the electronic system controlling the whole working of the loom.
  • FIG. 3 clearly illustrates how it may thus be possible to set the pressure (ordinates) in the nozzles during the weft insertion cycle in the loom, - by simply varying the energizing times (abscissae) of the solenoid valves 8, 9, 10.
  • the capacity of the single solenoid valves used in the system according to the invention should be smaller than the capacity of one single equivalent solenoid valve: this allows to realize, with small valves, a compact body which is not necessarily greater in size than the body of a single equivalent valve.
  • the practical solution to the problem is favoured by the recent appearance on the market of miniaturized solenoid valves.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP91110552A 1990-06-27 1991-06-26 Dispositif pour commander l'alimentation des tuyères transportant le fil de trame le long de la foule d'une machine à tisser à tuyères Withdrawn EP0465928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2077990 1990-06-27
IT02077990A IT1250918B (it) 1990-06-27 1990-06-27 Sistema di controllo dell'alimentazione degli ugelli di trasporto della trama nel passo di telai a getto di fluido

Publications (1)

Publication Number Publication Date
EP0465928A1 true EP0465928A1 (fr) 1992-01-15

Family

ID=11171949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110552A Withdrawn EP0465928A1 (fr) 1990-06-27 1991-06-26 Dispositif pour commander l'alimentation des tuyères transportant le fil de trame le long de la foule d'une machine à tisser à tuyères

Country Status (2)

Country Link
EP (1) EP0465928A1 (fr)
IT (1) IT1250918B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554222A1 (fr) * 1992-01-28 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Procédé pour contrôler l'insertion de trame dans un métier à jet
EP0554221A1 (fr) * 1992-01-27 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Appareil pour contrôler la pression d'injection d'un fluide dans une buse auxiliaire d'un métier à jet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3300934A1 (de) * 1982-01-18 1983-07-21 Rueti Te Strake Bv Verfahren zum eintragen verschiedener schussfaeden von unterschiedlicher garnbeschaffenheit in das webfach einer duesenwebmaschine und duesenwebmaschine zum durchfuehren des verfahrens
GB2151266A (en) * 1983-12-13 1985-07-17 Saurer Diederichs Sa Compressed air supply device for a weaving machine with pneumatic picking of at least two weft threads
US4877064A (en) * 1987-01-26 1989-10-31 Vilminore Officine Meccaniche S.P.A. Device for the automatic control of the weft yarn feed in air looms
US4932442A (en) * 1988-07-12 1990-06-12 Nissan Motor Co., Ltd. Preliminary jet feedforward weft insertion control system for jet loom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3300934A1 (de) * 1982-01-18 1983-07-21 Rueti Te Strake Bv Verfahren zum eintragen verschiedener schussfaeden von unterschiedlicher garnbeschaffenheit in das webfach einer duesenwebmaschine und duesenwebmaschine zum durchfuehren des verfahrens
GB2151266A (en) * 1983-12-13 1985-07-17 Saurer Diederichs Sa Compressed air supply device for a weaving machine with pneumatic picking of at least two weft threads
US4877064A (en) * 1987-01-26 1989-10-31 Vilminore Officine Meccaniche S.P.A. Device for the automatic control of the weft yarn feed in air looms
US4932442A (en) * 1988-07-12 1990-06-12 Nissan Motor Co., Ltd. Preliminary jet feedforward weft insertion control system for jet loom

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554221A1 (fr) * 1992-01-27 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Appareil pour contrôler la pression d'injection d'un fluide dans une buse auxiliaire d'un métier à jet
EP0554222A1 (fr) * 1992-01-28 1993-08-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Procédé pour contrôler l'insertion de trame dans un métier à jet

Also Published As

Publication number Publication date
IT9020779A1 (it) 1991-12-27
IT1250918B (it) 1995-04-21
IT9020779A0 (it) 1990-06-27

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