EP2025783A1 - Weft thread monitoring in the thread clamp of a loom - Google Patents
Weft thread monitoring in the thread clamp of a loom Download PDFInfo
- Publication number
- EP2025783A1 EP2025783A1 EP07016066A EP07016066A EP2025783A1 EP 2025783 A1 EP2025783 A1 EP 2025783A1 EP 07016066 A EP07016066 A EP 07016066A EP 07016066 A EP07016066 A EP 07016066A EP 2025783 A1 EP2025783 A1 EP 2025783A1
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- EP
- European Patent Office
- Prior art keywords
- thread
- weft
- weft thread
- weaving machine
- sensor
- 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.)
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 5
- 238000009941 weaving Methods 0.000 claims abstract description 21
- 238000012806 monitoring device Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241001295925 Gegenes Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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
- D03D51/34—Weft stop motions
-
- 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
Definitions
- the invention relates to a loom and a method for weft thread monitoring in a loom according to the preamble of the independent claims.
- the senor is arranged on the stationary thread clamp, which is located in the region of the sheet stop of the goods.
- Such stationary thread clamps are provided in some types of equipment, especially in the processing of relatively thick yarns, and have the task of keeping the weft thread taut.
- the senor is a triboelectric sensor.
- the Use of optical, capacitive, piezoelectric or inductive sensors is also conceivable that the Use of optical, capacitive, piezoelectric or inductive sensors.
- the edge thread clamp 3 moves synchronously to the sheet 1. It stops the inserted weft thread 4 fixed his end and leads him together with the sheet 1 against the stop 7.
- FIG. 1 Schematically drawn in Fig. 1 is also a frame 8 of the weaving machine, which is stationary and on which the other components are fixed or movable.
- At least one stationary thread clamp 10 is also provided in the weaving machine. It is located laterally next to the product 6 at the level of the stop 7. It is fixed to the frame 8.
- the thread clamp 10 is used to temporarily hold the registered and brought from the sheet 1 and the edge thread clamp 3 to stop 7 weft. She keeps the weft taut in this area. As a rule, she keeps several weft threads at the same time.
- stationary thread clamps 10 are arranged on both sides of the product, so that the weft thread can be kept taut between them.
- the weft monitoring device described below can be arranged on one or both of these thread clamps.
- the position of the second thread clamp is in Fig. 1 indicated by the reference numeral 10 '.
- the use of two thread clamps with the weft thread monitoring device described below has the advantage that additional types of defects can be detected (eg breakage of the weft thread on the insertion side or jumping out of the entry side thread clamp) which can not be detected with only one weft thread monitoring device ,
- a first embodiment of the thread clamp 10 is made Fig. 2 seen. It has two arms 11, 12, which are pressed against each other, so that they are able to pinch the weft thread 4 between them and able to hold. Preferably, they are resiliently urged against each other, ie by means of elastic forces.
- at least one of the arms, namely, the upper arm 12, is elastic and is pressed under deformation against the other arm.
- a weft yarn monitoring device is arranged on the thread clamp 10.
- This has a triboelectric sensor, which consists essentially of a conductor portion 13 which is disposed on one of the arms 11, 12, in the present embodiment on the lower, more massive arm 11.
- the upper end of the conductor portion 13 is located on the surface of the Thread clamp 10 in the area between the arms 11, 12, so that it comes into contact with the guided through the thread clamp 10 weft and thus detects whether the weft thread between the arms 11, 12 has occurred.
- electrical charges are transferred between the conductor section 13 and the weft thread, which generate a detectable charge shock.
- a high-impedance electrical amplifier 15 is connected to the conductor section 13.
- the conductor section 13 is preferably electrically isolated from the arm 11 by means of an insulator 14.
- Fig. 2 seen that the two arms 11, 12 are mechanically connected to a common bracket 16, which, as in Fig. 1 shown schematically, is attached to the frame 8.
- the described triboelectric detection of the weft thread has the advantage that it is relatively insensitive to contamination and allows a relatively reliable detection in the environment of a loom.
- other measuring methods are also conceivable, some of which are described below.
- Fig. 3 shows an embodiment of the weft monitoring device with optical sensor, with the optical absorption, scattering and / or reflection can be detected on the weft.
- this embodiment operates as a light barrier and has a light source 18 whose signal is coupled into a light guide 19 shown schematically.
- Light guide 19 is disposed on the upper arm 12 and guides the light into the gap between the arms 11, 12.
- a second light guide 20 is arranged, which the light receives and leads to an optical detector 21, whose signal is then amplified by the amplifier 15.
- weft thread enters the region between the two light guides 19, 20, it interrupts the light path, which leads to a corresponding signal at the output of the amplifier 15.
- Fig. 4 shows a further embodiment of the weft monitoring device with optical sensor.
- the optical sensor measures in reflection.
- only one light guide 20 is provided, in which light is coupled from the light source 18, reflected in the region of the gap between the arms 11, 12 and fed back into the light guide 20 and then guided to the optical detector 21.
- a partially transparent mirror or beam splitter 22 is provided.
- Fig. 5 shows a weft-monitoring device with capacitive sensor. This consists of two electrodes 24, 25 which are arranged on opposite sides of the gap between the arms 11, 12. Preferably, at least one of the electrodes is covered by an insulating cover layer 26, so that direct electrical contact between the electrodes is avoided.
- weft thread changes their distance and thus the capacitance between the electrodes.
- the weft thread has a dielectric constant ⁇ unlike that of air, which also leads to a change in the electrical capacitance when the weft thread is between the electrodes 24, 25.
- Fig. 6 shows an inductive sensor weft monitoring device. This has, for example, a coil 30 which is arranged in the arm 11 is, and which generates a magnetic field, which penetrates the other arm 12. If the other arm 12 is made of metal, then a movement of the other arm 12 causes an inductance change in the coil 30, which in turn can be detected by a suitable measuring electronics 28.
- a coil 30 which is arranged in the arm 11 is, and which generates a magnetic field, which penetrates the other arm 12. If the other arm 12 is made of metal, then a movement of the other arm 12 causes an inductance change in the coil 30, which in turn can be detected by a suitable measuring electronics 28.
- measuring methods which are based on the fact that the electrical resistance between the arms 11, 12 changes during insertion of the weft thread. For this purpose, it can be measured what kind of current flows between the arms.
- the change in the contact force is detected, for example, with a piezoelectric sensor.
- a piezoelectric sensor 31 is shown schematically in FIG Fig. 2 drawn and carries one of the two arms 11, 12th
- FIG. 7 Another embodiment of the device is in Fig. 7 shown.
- This is a triboelectric sensor 13, 14, as in the embodiment according to Fig. 2 ,
- the sensor is not disposed between the arms 11, 12, but at the entrance mouth 32 of the thread clamp 10.
- This entrance mouth 32 is formed by a region in which the arms 11, 12 form two expanding guide surfaces which catch the incoming thread and between the arms 11, 12 lead.
- This arrangement can be advantageous in practical operation since the sensor can be placed in a convex part of the surface of the clamp so that it is less prone to fouling.
- Fig. 8 An example of an optical sensor is in Fig. 8 shown.
- a light source 18, a partially transparent mirror 22 and a light detector 21 are provided are.
- the operation of the arrangement essentially corresponds to that of Fig. 4 ,
- the present weft yarn monitoring device is also suitable for retrofitting in weaving machines, e.g. together with the subsequent installation of stationary thread clamps 10.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Die Erfindung betrifft eine Webmaschine und ein Verfahren zur Schussfadenüberwachung in einer Webmaschine gemäss Oberbegriff der unabhängigen Ansprüche.The invention relates to a loom and a method for weft thread monitoring in a loom according to the preamble of the independent claims.
Es sind verschiedene Webmaschinen bekannt, die eine Schussfaden-Überwachungsvorrichtung zum Überwachen des Schussfadens besitzen. Beispielsweise wird in
Es zeigt sich allerdings, dass mit einem derartigen Verfahren insbesondere spät im Maschinenzyklus auftretende Fehler nicht verlässlich gemessen werden können. Es stellt sich deshalb die Aufgabe, eine Webmaschine bzw. ein Verfahren der eingangs genannten Art bereitzustellen, das auch noch spät im Maschinenzyklus auftretende Fehler zu detektieren vermag.It turns out, however, that such a method can not reliably measure errors occurring late in the machine cycle. It is therefore the object to provide a loom or a method of the type mentioned, which is able to detect even late in the machine cycle occurring errors.
Diese Aufgabe wird von der Webmaschine bzw. dem Verfahren gemäss den unabhängigen Ansprüchen gelöst.This object is achieved by the loom or the method according to the independent claims.
Demgemäss wird der Sensor an der stationären Fadenklemme angeordnet, welche sich im Bereich des Blattanschlags der Ware befindet. Derartige stationäre Fadenklemmen sind in einigen Gerätetypen, insbesondere bei der Verarbeitung relativ dicker Garne, vorgesehen und haben die Aufgabe, den Schussfaden gespannt zu halten.Accordingly, the sensor is arranged on the stationary thread clamp, which is located in the region of the sheet stop of the goods. Such stationary thread clamps are provided in some types of equipment, especially in the processing of relatively thick yarns, and have the task of keeping the weft thread taut.
Dank der Durchführung der Messung an der stationären Fadenklemme wird es möglich, den Eintrag und das Anschlagen des Schussfadens bis ganz zum Schluss zu überwachen und auch noch sehr späte Fehler, wie z.B. ein Fadenbruch oder ein Herausspringen aus der Fadenklemme, zu detektieren.By carrying out the measurement on the stationary thread clamp, it becomes possible to monitor the entry and the striking of the weft thread up to the very end, and also very late errors, such as e.g. a yarn break or jumping out of the thread clamp to detect.
Vorzugsweise ist der Sensor ein triboelektrischer Sensor. Denkbar ist jedoch insbesondere auch der Einsatz optischer, kapazitiver, piezoelektrischer oder induktiver Sensoren.Preferably, the sensor is a triboelectric sensor. However, it is also conceivable that the Use of optical, capacitive, piezoelectric or inductive sensors.
Weitere bevorzugte Ausführungen ergeben sich aus den abhängigen Ansprüchen sowie aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:
-
Fig. 1 eine Webmaschine mit einer ersten Ausführung eines erfindungsgemässen Detektors, -
Fig. 2 eine Seitenansicht der stationären Fadenklemme vonFig. 1 mit triboelektrischem und/oder piezoeketrischem Detektor, -
Fig. 3 eine schematisierte Seitenansicht einer zweiten Ausführung der stationären Fadenklemme mit optischem Detektor zur Messung in Transmission, -
Fig. 4 eine schematisierte Seitenansicht einer dritten Ausführung der stationären Fadenklemme mit optischem Detektor zur Messung in Reflektion, -
Fig. 5 eine schematisierte Seitenansicht einer vierten Ausführung der stationären Fadenklemme mit kapazitivem Detektor, -
Fig. 6 eine schematisierte Seitenansicht einer fünften Ausführung der stationären Fadenklemme mit induktivem oder kapazitiven Detektor, -
Fig. 7 eine schematisierte Seitenansicht einer weiteren Ausführung mit triboelektrischem Detektor an der Mündung der Klemme und -
Fig. 8 eine schematisierte Seitenansicht einer weiteren Ausführung mit optischem Detektor an der Mündung der Klemme. -
Fig. 1 zeigt einen Bereich der Schussfaden-Ankunftsseite einer Projektil-Webmaschine. Sichtbar ist das Blatt 1 mit einer Vielzahl von Blattstäben 2 und eine Randfadenklemme 3 für den Schussfaden 4. Schematisch dargestellt ist ferner dasFach 5 und die bereitsgewobene Ware 6 mit demBlattanschlag 7.
-
Fig. 1 a weaving machine with a first embodiment of a detector according to the invention, -
Fig. 2 a side view of the stationary thread clamp ofFig. 1 with triboelectric and / or piezoelectric detector, -
Fig. 3 a schematic side view of a second embodiment of the stationary thread clamp with optical detector for measurement in transmission, -
Fig. 4 a schematic side view of a third embodiment of the stationary thread clamp with optical detector for measurement in reflection, -
Fig. 5 a schematic side view of a fourth embodiment of the stationary thread clamp with capacitive detector, -
Fig. 6 a schematic side view of a fifth embodiment of the stationary thread clamp with inductive or capacitive detector, -
Fig. 7 a schematic side view of another embodiment with triboelectric detector at the mouth of the terminal and -
Fig. 8 a schematic side view of another embodiment with optical detector at the mouth of the terminal. -
Fig. 1 shows an area of the weft arrival side of a projectile loom. Visible is the sheet 1 with a plurality of leaf rods 2 and a Randfadenklemme 3 for the weft thread 4. Schematically represented is thetray 5 and the alreadywoven goods 6 with the sheet stop. 7
Die Randfadenklemme 3 bewegt sich synchron zum Blatt 1. Sie hält den eingetragenen Schussfaden 4 an seinem Ende fest und führt ihn zusammen mit dem Blatt 1 gegen den Anschlag 7.The edge thread clamp 3 moves synchronously to the sheet 1. It stops the inserted weft thread 4 fixed his end and leads him together with the sheet 1 against the
Schematisch eingezeichnet in
Wie bereits erwähnt, ist in der Webmaschine ferner mindestens eine stationäre Fadenklemme 10 vorgesehen. Sie befindet sich seitlich neben der Ware 6 auf Höhe des Anschlags 7. Sie ist fix mit dem Rahmen 8 verbunden.As already mentioned, at least one
Die Fadenklemme 10 dient dazu, den eingetragenen und vom Blatt 1 und der Randfadenklemme 3 zum Anschlag 7 gebrachten Schussfaden temporär zu halten. Sie hält in diesem Bereich den Schussfaden gespannt. In der Regel hält sie mehrere Schussfäden gleichzeitig.The
Der Arbeitsablauf der Webmaschine nach
- Zuerst wird der Schussfaden 4 ins
Fach 6 eingetragen und sein Ende wird von der Randfadenklemme 3 ergriffen. Dann wird das Blatt 1 gegen denAnschlag 7 bewegt und drückt den Schussfaden 4 in diese Richtung. Gleichzeitig bewegt sich auch die Randfadenklemme 3, um der Bewegung des Schussfadens 4 zu folgen. Im Lauf seiner Bewegung wird der Schussfaden kurz vor oder nach Erreichen desAnschlags 7 horizontal (d.h. parallel zur Ware 6) in dieFadenklemme 10 eingeführt von dieser erfasst und temporär amAnschlag 7 gehalten. Nur wird der Schussfaden beidseitig abgeschnitten bzw. abgelängt. Sodann verlässt der Schussfaden 4 auf der weiteren Bewegung derWare 6 dieFadenklemme 10 wieder.
- First, the weft thread 4 is entered into the
compartment 6 and its end is gripped by the edge thread clamp 3. Then, the sheet 1 is moved against thestopper 7 and presses the weft thread 4 in this direction. At the same time, the edge thread clamp 3 also moves to follow the movement of the weft thread 4. In the course of its movement, the weft thread is inserted shortly before or after reaching thestop 7 horizontally (ie parallel to the product 6) in thethread clamp 10 of this detected and temporarily held on thestop 7. Only the weft is cut on both sides or cut to length. Then leaves the weft thread 4 on the further movement of theproduct 6, thethread clamp 10 again.
Vorzugsweise sind auf beiden Seiten der Ware 6 stationäre Fadenklemmen 10 angeordnet, so dass der Schussfaden zwischen diesen gespannt gehalten werden kann. Die im Folgenden beschriebene Schussfaden-Überwachungsvorrichtung kann an einer oder beiden dieser Fadenklemmen angeordnet werden. Die Position der zweiten Fadenklemme wird in
Der genaue Aufbau einer ersten Ausführung der Fadenklemme 10 ist aus
Wie aus
Zur Detektion des Signals ist ein hochohmiger elektrischer Verstärker 15 mit dem Leiterabschnitt 13 verbunden.For detecting the signal, a high-impedance
Ist der Arm 11 aus Metall, so wird der Leiterabschnitt 13 vorzugsweise elektrisch vom Arm 11 isoliert, mittels eines Isolators 14.If the
Weiter ist aus
Im Arbeitszyklus der Webmaschine wird nun geprüft, ob der Schussfaden in einem vorgegebenen Zeitintervall (= Intervall im Maschinenzyklus) bei der Fadenklemme 10 ankommt und dabei von der Schussfaden-Überwachungsvorrichtung detektiert wird. Ist dies nicht der Fall, so kann auf eine Fehlfunktion geschlossen werden.In the working cycle of the weaving machine is now checked whether the weft yarn in a predetermined time interval (= interval in the machine cycle) arrives at the
Derartige Fehlfunktionen können durch verschiedene Ereignisse ausgelöst werden, insbesondere:
- Der Schussfaden kommt gar nicht bei der stationären Fadenklemme 10 an, z.B. weil er von der beweglichen Randfadenklemme 3 nicht erfasst werden konnte;
Die Fadenklemme 10 verliert den Schussfaden wieder;Die Fadenklemme 10 ist defekt und nicht in der Lage, den Schussfaden zu halten.
- The weft does not arrive at the
stationary thread clamp 10, for example because it could not be detected by the movable edge thread clamp 3; - The
thread clamp 10 loses the weft again; - The
thread clamp 10 is defective and unable to hold the weft.
Die beschriebene triboelektrische Detektion des Schussfadens hat den Vorteil, dass sie gegenüber Verschmutzungen relativ unempfindlich ist und eine relativ verlässliche Detektion im Umfeld einer Webmaschine erlaubt. Denkbar sind jedoch auch andere Messverfahren, von denen einige im Folgenden beschrieben werden.The described triboelectric detection of the weft thread has the advantage that it is relatively insensitive to contamination and allows a relatively reliable detection in the environment of a loom. However, other measuring methods are also conceivable, some of which are described below.
Wie schematisch dargestellt, arbeitet diese Ausführung als Lichtschranke und besitzt eine Lichtquelle 18, deren Signal in einen schematisch gezeigten Lichtleiter 19 eingekoppelt wird. Lichtleiter 19 ist am oberen Arm 12 angeordnet und führt das Licht in den Spalt zwischen den Armen 11, 12. Gegenüber am unteren Arm 11 ist ein zweiter Lichtleiter 20 angeordnet, welcher das Licht empfängt und zu einem optischen Detektor 21 führt, dessen Signal sodann vom Verstärker 15 verstärkt wird.As schematically shown, this embodiment operates as a light barrier and has a
Tritt der Schussfaden in den Bereich zwischen den beiden Lichtleitern 19, 20, so unterbricht er den Lichtgang, was zu einem entsprechenden Signal am Ausgang des Verstärkers 15 führt.If the weft thread enters the region between the two light guides 19, 20, it interrupts the light path, which leads to a corresponding signal at the output of the
Das Einführen eines Schussfadens zwischen die Arme 11, 12, ändert deren Abstand und somit die Kapazität zwischen den Elektroden. Zudem besitzt der Schussfaden eine dielektrische Konstante ε ungleich jener von Luft, was ebenfalls zu einer Änderung der elektrischen Kapazität führt, wenn sich der Schussfaden zwischen den Elektroden 24, 25 befindet. Somit kann über eine kapazitive Messung mit einer geeigneten Messelektronik 28 die Anwesenheit des Schussfadens detektiert werden.The insertion of a weft thread between the
Denkbar sind beispielsweise auch Messverfahren, welche darauf abstützen, dass sich der elektrische Widerstand zwischen den Armen 11, 12 beim Einführen des Schussfadens ändert. Hierzu kann gemessen werden, was für ein Strom zwischen den Armen fliesst.Also conceivable, for example, are measuring methods which are based on the fact that the electrical resistance between the
Weiter ist auch denkbar, dass die Änderung der Anpresskraft z.B. mit einem piezoelektrischen Sensor detektiert wird. Ein solcher Sensor 31 ist schematisch in
Eine weitere Ausführung der Vorrichtung ist in
Die Anordnung des Sensors an der Eingangsmündung der Klemme, so dass er das Eintreffen des Schussfadens bei der Eingangsmündung detektiert, eignet sich auch für die anderen, oben erwähnten Sensortypen. Ein Beispiel für einen optischen Sensor ist in
Die vorliegende Schussfaden-Überwachungsvorrichtung eignet sich auch für den nachträglichen Einbau in Webmaschinen, z.B. zusammen mit dem nachträglichen Einbau von stationären Fadenklemmen 10.The present weft yarn monitoring device is also suitable for retrofitting in weaving machines, e.g. together with the subsequent installation of stationary thread clamps 10.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP20070016066 EP2025783B1 (en) | 2007-08-16 | 2007-08-16 | Weft thread monitoring in the thread clamp of a loom |
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EP20070016066 EP2025783B1 (en) | 2007-08-16 | 2007-08-16 | Weft thread monitoring in the thread clamp of a loom |
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EP2025783A1 true EP2025783A1 (en) | 2009-02-18 |
EP2025783B1 EP2025783B1 (en) | 2013-06-12 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2312709A1 (en) * | 1972-03-17 | 1973-09-27 | Vnii Ljochkowo I Textilnowo Ma | DEVICE FOR HOLDING THE WEFT END ON SHUTTERLESS WEB MACHINES |
US3978893A (en) * | 1974-09-26 | 1976-09-07 | Enshu, Limited | Apparatus for detecting success in weft insertion of shuttleless looms |
US4498504A (en) * | 1982-09-23 | 1985-02-12 | Burlington Industries, Inc. | Filling fringe waste reduction |
DE3921033A1 (en) * | 1988-06-27 | 1989-12-28 | Tagawa Kikai Co | DEVICE FOR DETECTING THE WIFE THREAD IN THE CONTACTLESS WEAVING MACHINE |
US5083584A (en) * | 1989-04-07 | 1992-01-28 | Gebruder Loepfe Ag. | Weft yarn detector for a shuttleless weaving loom |
-
2007
- 2007-08-16 EP EP20070016066 patent/EP2025783B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2312709A1 (en) * | 1972-03-17 | 1973-09-27 | Vnii Ljochkowo I Textilnowo Ma | DEVICE FOR HOLDING THE WEFT END ON SHUTTERLESS WEB MACHINES |
US3978893A (en) * | 1974-09-26 | 1976-09-07 | Enshu, Limited | Apparatus for detecting success in weft insertion of shuttleless looms |
US4498504A (en) * | 1982-09-23 | 1985-02-12 | Burlington Industries, Inc. | Filling fringe waste reduction |
DE3921033A1 (en) * | 1988-06-27 | 1989-12-28 | Tagawa Kikai Co | DEVICE FOR DETECTING THE WIFE THREAD IN THE CONTACTLESS WEAVING MACHINE |
US5083584A (en) * | 1989-04-07 | 1992-01-28 | Gebruder Loepfe Ag. | Weft yarn detector for a shuttleless weaving loom |
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