WO2006005203A1 - Procede et dispositif d'arret automatique d'un metier a tisser - Google Patents

Procede et dispositif d'arret automatique d'un metier a tisser Download PDF

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Publication number
WO2006005203A1
WO2006005203A1 PCT/CH2005/000362 CH2005000362W WO2006005203A1 WO 2006005203 A1 WO2006005203 A1 WO 2006005203A1 CH 2005000362 W CH2005000362 W CH 2005000362W WO 2006005203 A1 WO2006005203 A1 WO 2006005203A1
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WO
WIPO (PCT)
Prior art keywords
loom
warp
contact
short
simulated
Prior art date
Application number
PCT/CH2005/000362
Other languages
German (de)
English (en)
Inventor
Reto Gehrig
Rolf Joss
Original Assignee
Uster Technologies Ag
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 Uster Technologies Ag filed Critical Uster Technologies Ag
Publication of WO2006005203A1 publication Critical patent/WO2006005203A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions

Definitions

  • the present invention relates to a method and a device for the automatic shutdown of a loom, according to the preamble of the independent claims.
  • Such stopping devices the z. B. can be configured as electric warp stop, typically include a across the width of the web parallel to each other, electrically mutually insulated busbar pair.
  • the warp threads to be monitored each carry one.
  • Multilam Each contact lamella is arranged and arranged so that it at a
  • Kettfadenbruch the pair of busbars electrically connected together and so closes a circuit. If the circuit is closed, transmits a corresponding electrical circuit a stop signal to the
  • An automatic monitoring system for a web is z. B. from EP-O'162'134 known.
  • Such monitoring systems typically scan the web along its width with a scanning head containing an optoelectronic sensor. The sensor signal is evaluated in a processor. The evaluation includes the construction of the image of a part of the web, the detection of possible errors and the. Triggering an action associated with a detected error. Such an action may in certain cases be the automatic shutdown of the weaving machine, for example when determining a coarse or impermissible fault in the web.
  • the shutdown of a loom is not a problem: It would be possible for the skilled person to connect the monitoring device by means of a suitable connection cable with the control cabinet of the loom so that the transmission of a shutdown signal via the connection cable causes a shutdown of the loom. In practice, however, such a direct approach involves difficulties that should not be underestimated. There are probably several dozen weaving machine types of different ages from different manufacturers. The weaving machines in use have a large variety of interfaces for connecting cables of the type mentioned. Therefore, either the connection cable would have to be individually adapted to the weaving machine in question, or with each monitoring device, a set of several dozen connecting cables would have to be made available, of which, hopefully, one would fit the loom to be monitored. Both alternatives are complex and expensive.
  • the solution idea for the task is based on the recognition that most weaving machines are equipped with stopping devices, which automatically turn off the loom when a thread breakage is detected. Such stopping devices are usually easily accessible. These findings spurred the idea of a solution to simulate a thread break in order to stop the weaving machine by means of an already existing stopping device. Direct access to the machine control system, which offers complex solutions Special cables or adapters and complicated cable laying would require, is therefore unnecessary.
  • an event is simulated which causes the stopping device to stop the loom automatically.
  • a thread break preferably a warp, weft, catch, leno thread break or other categories of yarn breaks, simulated.
  • the device according to the invention for carrying out the method according to the invention includes action means which are suitable for acting on the stopping device in such a way that it causes the weaving machine to be switched off automatically.
  • 1 shows an automatic warp stop motion according to the prior art in a partially cutaway perspective view
  • FIG. 2 shows a first embodiment of a process stop device according to the invention in a partially cutaway perspective view
  • FIG. 3 shows an adapter for use in the process stop device according to FIG.
  • FIG. 4 shows a second embodiment of a process stop device according to the invention in a partially cutaway perspective view
  • Fig. 5 is a theoretical, caused by a Kettfadenbruch electrical signal of a warp stop as a function of time, and
  • FIG. 6 shows a theoretical electrical signal of a warp thread monitor as a function of time, generated according to the method according to the invention.
  • an automatic warp stopper 101 is shown according to the prior art.
  • the warp stop motion detector 101 has a contact rail 102 running in the weft direction.
  • the contact rail 102 includes a U-shaped first bus bar 121, in which a second bus bar 122 is housed with the interposition of an electrical insulation 123.
  • On an unbroken, to be monitored warp 107 each hangs a contact blade 104, at least partially made of electrically conductive material is made.
  • the contact lamella 104 drops to a lower position due to gravity and electrically connects the first bus bar 121 to the second bus bar 122. This completes a circuit and shuts off the loom (not shown).
  • a warp thread breakage is simulated in order to force a shutdown of the weaving machine in a simple manner.
  • the simulation can be done directly or indirectly, as the following figures 2 and 4 explain.
  • FIG. 2 shows a first embodiment of a device 1, hereinafter referred to as "process stop device", for carrying out an "immediate" shutdown method according to the invention.
  • the first bus bar 121 and the second bus bar 122 are respectively directly contacted by means of suitable contact electrodes 21, 22, which are indicated very schematically in FIG. 2.
  • the contact electrodes 21, 22 may be mounted on an adapter 2 according to FIG. 3, which can be placed on the contact rail 102.
  • the required parking signal is from a known monitoring device 6 for the woven (not shown) web, for example.
  • a shut-off relay 61 include, which acts as a switch for closing the circuit formed by the bus bars 121, 122, - the contact electrodes 21, 22 and the connecting lines 31, 32.
  • the shut-off relay 61 in turn is controlled by a program driver, which is assigned to a present in the monitoring device 6 or the monitoring device 6
  • the program typically causes the loom to be shut down if a gross or impermissible fault in the web is detected during automatic monitoring.
  • a relay another switching element with an analogous function, eg. As a transistor, an opto-coupler, etc., can be used.
  • FIG. 1 An example of an adapter 2 which can be used for contacting the busbars 121, 122 is shown in FIG.
  • the adapter 2 is designed as composed of two parts 23, 24 block, which the
  • Contact rail 102 encloses.
  • contact electrodes 21, 22 are embedded in corresponding contact electrodes 21, 22 of the adapter 2.
  • the contact electrodes 21, 22 can be connected by means of connecting lines 31, 32 to the monitoring device 6 indicated in FIG. 2.
  • FIG. 4 shows a possible embodiment of a process stop device 1 for carrying out an "indirect" shutdown method according to the invention.
  • This second embodiment includes a plate carrier 5 which can be mounted on the contact rail 102.
  • the plate carrier 5 has an actuatable holding element 51 for its own simulation contact plate 4.
  • the simulation contact blade 4 depends in the illustrated state of readiness on the holding element 51, in a similar manner as the other contact blades 104 each depend on their associated warp threads 107, - see. FIG. 1.
  • the holding element 51 can be actuated by means of an actuating element (not shown) such that it can drop the simulation contact lamella 4 onto the contact rail 102 in response to a corresponding stop signal.
  • a suitable actuator may, for. B. be designed as an electromagnet, with the movable armature, the finger-shaped holding member 51 is operatively connected. Dropping the simulation contact blade 4 results in the weaving machine stopping because the stopping device does not distinguish between the simulation contact blade and another contact blade.
  • the actuating element is, for example, connected via two electrical connecting lines 31, 32 to the parking relay 61 in the monitoring device 6.
  • Monitoring device 6 with Abstellrelais 61 is already indicated in Fig. 2.
  • the parking relay 61 controls the actuator 51 and causes its operation when the loom is to be turned off.
  • z. B. the relay contacts to be connected to the supply of an electromagnet, which may be present as an actuator in the plate carrier 5.
  • the actuator 51 can be controlled in other ways known in the art.
  • the existing sensors including the stopping devices 101
  • an evaluation unit which evaluates the sensor signals.
  • an external data acquisition system or expert system may perform the evaluation.
  • the evaluation unit can keep a statistic of the detected shutdowns. Such a statistic could be falsified by the inventive method in an undesirable manner, because yes in the inventive method, a thread break is simulated, which is none, but is detected in the statistics as such.
  • corruption of the statistics may be avoided, as shown below.
  • the idea for preventing statistical corruption is based on the finding that a contact blade 104 falling down due to yarn breakage and a closing shut-off relay 61 cause different electrical signals at the two busbars 121, 122.
  • the parking relay 61 in a controlled manner, for. B. during a predefined time, be operated.
  • the signal 91 illustrates a theoretical, of 'caused a yarn breakage electrical signal 91 as a function of time t recorded.
  • the signal 91 is initially at a first level, e.g. In the warp break, the signal 91 shows a typical transient response with a variety of signal peaks, which is explained by the partially elastic rebound of the contact blade 104 of the contact rail 102. Only after the contact blade 104 by damping has come to rest, the signal 91 remains constant at a second level, for example at the value "1". The second signal level "l w" is maintained until the yarn break has been rectified and the contact blade 104 is again in the suspended ready state. If necessary, the signal could already be debounced in the warp stop motion, so that any signal peaks would have already been filtered out.
  • the signal 92 can be distinguished with simulated yarn breakage. The latter is also recorded theoretically and as a function of time t in FIG. Also, this signal 92 has when switching on the Abstellrelais 61 some caused by oscillations signal peaks, and this signal could possibly also be entprellt already in the warp stop, so that any signal peaks would be filtered out.
  • Important for the discrimination of the signal 92 (FIG. 6) from signal 91 (FIG. 5) is the fact that the shutdown relay 61 for the simulation of the thread break remains switched on only during a defined time interval T and can then be switched off again. In other words, the loom is turned off by a pulse of well-defined pulse duration T.
  • the pulse duration T can be chosen to be significantly shorter than the time it takes to fix a thread break, for example between fractions of a second and a few seconds.
  • the evaluation of the loom, z. As the process control unit and / or the corresponding data acquisition or expert system, can determine with a simple routine, how long the signal remains at the second signal level "1" ' Is the dwell time at the second signal level "1 ⁇ only short - just predefined pulse duration T -, this is a simulated thread break, which must not be taken into account in the statistics.A longer dwell time at the second signal level "1" is a real thread break, which must be included in the statistics.
  • Connecting lines 31, 32 can thus supply signals with different shapes and meanings to the

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

Abstract

L'invention concerne un procédé d'arrêt automatique d'un métier à tisser, par exemple, lors de la constatation d'un gros défaut dans la nappe de tissu par un dispositif de surveillance (6). On part du principe que le métier à tisser est équipé d'un garde de fil de chaîne (101). Des moyens actifs, par exemple, des électrodes de contact (21, 22) et les lignes de raccordement (31, 32) correspondantes spécialement montés sur le garde de fil de chaîne (101) permettent d'effectuer une simulation de rupture du fil de chaîne. Le garde de fil de chaîne (101) provoque l'arrêt automatique du métier à tisser. Le garde de fil de chaîne (101) est, pour quasiment toutes les générations et tous le types de métiers à tisser, facilement accessible en vue d'installer les moyens actifs (21, 22, 31, 32). Cela permet de renoncer aux solutions coûteuses utilisant des câbles spéciaux et des câbles compliqués.
PCT/CH2005/000362 2004-07-15 2005-06-30 Procede et dispositif d'arret automatique d'un metier a tisser WO2006005203A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH11972004 2004-07-15
CH1197/04 2004-07-15

Publications (1)

Publication Number Publication Date
WO2006005203A1 true WO2006005203A1 (fr) 2006-01-19

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ID=34970675

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PCT/CH2005/000362 WO2006005203A1 (fr) 2004-07-15 2005-06-30 Procede et dispositif d'arret automatique d'un metier a tisser

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1078215A (en) * 1913-04-14 1913-11-11 Draper Co Warp-stop-motion attachment.
US3929171A (en) * 1974-11-27 1975-12-30 Rockwell International Corp Fail safe stop motion for looms
FR2486972A1 (fr) * 1980-07-21 1982-01-22 Saurer Diederichs Sa Dispositif de controle des cordons de fausse lisiere, pour machine a tisser sans navette
CH636387A5 (de) * 1979-04-25 1983-05-31 Sulzer Ag Kettfadenwaechtereinrichtung fuer eine webmaschine.
US4546802A (en) * 1984-06-04 1985-10-15 Burlington Industries, Inc. Automatic failure sensor for hot wire cutters
EP0162134A2 (fr) * 1984-04-24 1985-11-27 Zellweger Uster Ag Procédé et dispositif pour la surveillance automatique de configurations textiles planes, en particulier bandes de tissus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1078215A (en) * 1913-04-14 1913-11-11 Draper Co Warp-stop-motion attachment.
US3929171A (en) * 1974-11-27 1975-12-30 Rockwell International Corp Fail safe stop motion for looms
CH636387A5 (de) * 1979-04-25 1983-05-31 Sulzer Ag Kettfadenwaechtereinrichtung fuer eine webmaschine.
FR2486972A1 (fr) * 1980-07-21 1982-01-22 Saurer Diederichs Sa Dispositif de controle des cordons de fausse lisiere, pour machine a tisser sans navette
EP0162134A2 (fr) * 1984-04-24 1985-11-27 Zellweger Uster Ag Procédé et dispositif pour la surveillance automatique de configurations textiles planes, en particulier bandes de tissus
US4546802A (en) * 1984-06-04 1985-10-15 Burlington Industries, Inc. Automatic failure sensor for hot wire cutters

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