EP0962566B1 - Method for controlling weft releasing and stopping operation on yarn storage devices in looms - Google Patents
Method for controlling weft releasing and stopping operation on yarn storage devices in looms Download PDFInfo
- Publication number
- EP0962566B1 EP0962566B1 EP99109509A EP99109509A EP0962566B1 EP 0962566 B1 EP0962566 B1 EP 0962566B1 EP 99109509 A EP99109509 A EP 99109509A EP 99109509 A EP99109509 A EP 99109509A EP 0962566 B1 EP0962566 B1 EP 0962566B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- characteristic feature
- time
- stopping device
- weft thread
- loom
- 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
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims 1
- 238000009941 weaving Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
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
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
- D03D47/363—Construction or control of the yarn retaining devices
Definitions
- the invention relates to a method for monitoring the weft release and Stopping process on pre-winding devices, in particular with air jet looms in Active connection.
- the main nozzle of the air jet weaving machine and the prewinder are electrically controlled in such a way that the thread stopper of the prewinder releases the weft length synchronously with the electrical control of the electromagnetic control valve of the main nozzle and the thread stopper blocks the weft release at the end of the weft insertion process.
- This necessary or defined weft thread length is achieved in that the diameter of the drum of the prewinder is adjustable and thus picks up and releases an integer number of turns which corresponds to the weft thread insertion length.
- Known designs of prewinding devices have at least one thread stopper which can be moved radially to the drum diameter and thereby releases or stops the weft thread.
- the at least one stop device is actuated electromagnetically directly or also indirectly in connection with the switching of an electromagnetically actuated valve of the main nozzle.
- the synchronous operation of the electromagnetic stopper device of the prewinder and the solenoid valve of the main nozzle of an air jet weaving machine requires, as can be seen from EP 0 544 730 B1, that both the times for releasing and stopping the weft thread and the operating times of the main nozzle are in agreement or are within reasonable limits.
- the state of the art does not monitor whether the necessary conditions for synchronous operation continue to exist during web operation.
- the weft between the pre-winder and the main nozzle is subjected to a relatively high thread tension.
- this thread tensile force can lead to a so-called weft thread break during the aforementioned relatively short period of time or as the weft thread insertion process continues.
- DE 196 02 513 C1 discloses a method for monitoring the functionality of electrically controllable solenoid valves in weaving machines.
- the background to the invention is that a possible failure of the pneumatically operated and electrically controllable auxiliary units used in weaving machines can be recognized at an early stage.
- all electromagnetic systems including electrically controlled solenoid valves, have a characteristic curve of the control current (I) over time (t).
- the special characteristic of the control current (I) over time (t) is shown in the rising part of a curve as a brief current drop. This current drop occurs regularly when the magnetic circuit is closed in an electromagnetic system.
- the object is achieved in accordance with the method steps known per se. solved the invention according to DE 196 02 513 C1. Thereafter, the characteristic current profile of a device consisting of a coil, a spring-loaded stopper and a first and second position signal transmitter for the stopper is now also detected when the electromagnetic stopper device of a pre-winding device is electrically actuated. It is essential to the invention that the brief drop in the control current, which occurs regularly when the magnetic circuit in an electromagnetically operated system is closed, is measured over time in the ascending part of a curve and is shown in a diagram.
- the occurrence of this transient current slump at the time of actuation is with a t ⁇ t 1 defined as a target value and with a determined actual value ⁇ t 1 'compared.
- the determined actual value .DELTA.t 1 ' lies outside the predetermined time .DELTA.t 1 (setpoint) or a predetermined time window (setpoint range)
- an error message is generated in the control of the weaving machine, which leads to the interruption of the weaving process.
- the actuation time of the stopper device can be moved according to the invention in the sense of an advance or delay.
- the weft thread is released electromagnetically by the stopper device spring-loaded stopper, so in an embodiment of the invention to control the Stop function generates a path or position signal.
- a path or position signal for this come e.g. as a means Photoelectric sensors, initiators, Hall sensors and the like in question.
- the characteristic feature of the brief drop in the control current (I) occurs both when the thread stopper releases and when the weft thread is stopped.
- the first or second characteristic feature can optionally be used for monitoring the switching time of the stopper device.
- the control current I is plotted on the ordinate and the time t of the effective control current of a stop device connected to a direct current source VDC or a thread braking device of a spooling device 1 according to FIG. 3, not shown, is plotted on the abscissa.
- the current profile in an electromagnetic system, such as the stopper or thread braking device is known. Accordingly, it is also known, the current characteristic curve 1 that in the ascending part 1a, a brief current slump after driving the stopper or a t yarn braking device yields at a time .DELTA.t 1 2 as a characteristic feature of such a curve. 1
- This characteristic feature 2 occurs when the magnetic circuit of the stop device consisting of at least the coil 7 and the stopper 4 or the magnetic circuit of the thread brake device, not shown, closes.
- the occurrence of the characteristic feature 2 'at a time ⁇ t 1' , its deviation in time and size compared to a characteristic feature 2 at a time ⁇ t 1 or the absence of characteristic feature 2 is an indicator of the functionality of the above-mentioned devices of a prewinding device or an indicator of harmful asynchrony in the interaction between the weft insertion system of the weaving machine and the prewinding device third
- the characteristic feature 2 at ⁇ t 1 of curve 1 according to FIG. 1 is monitored, for example, by a peak value detection.
- the detection signal is forwarded to a measuring circuit 10 known per se, see also FIG. 2.
- the characteristic feature 2 at ⁇ t 1 is represented when each stopper device or each thread brake is activated (switched on) by means of a weaving machine control not specified here.
- the relevant control device of the weaving machine receives a signal which either indicates the absence of the characteristic feature 2 in the control stream 1 of the stopper device or the thread braking device and / or triggers an interruption of the weaving process.
- a measured actual value .DELTA.t 1 ' for the occurrence of the characteristic feature 2' is shown as an example on the abscissa according to FIG.
- This actual time period ⁇ t 1 ' and / or the actual control current curve 1' is recorded as a measured value.
- These measured values are compared with the reference values in the comparator 13 according to FIG. 2.
- a measured difference value and / or one of two compared with each other curves 1 and 1 are each' 1 resulting difference in the appearance of the characteristic feature 2 or 2 'is the point in time a t, which corresponds to the activation time of the stopper device 4, 7 according to FIG.
- ⁇ t 1 and ⁇ t 1 ' are corrected. It is important that at least the difference between ⁇ t 1 and ⁇ t 1 ' does not exceed or fall below a predetermined tolerance range. If, for example, the tolerance range is determined to be exceeded in the course of the operating time of the prewinding device 1, this is indicated by a signal relating to this, which can be associated with the interruption of the weaving process.
- the prewinder 3 shown schematically in FIG. 3 has a drum 3a, on which a weft thread 5 drawn off from a thread spool, not shown, is wound.
- the weft thread 5 is drawn off from the drum 3a overhead by a weft thread insertion member, not shown, via a thread guide 8.
- the weft insertion element is the main nozzle.
- the weft thread insertion member is controlled in such a way that the stopper device, consisting of the bobbin 7, the thread stopper 4 loaded with a spring 4a and the at least one detection device 6, or for example a thread braking device arranged in the pulling direction of the weft thread, see arrow direction 9, synchronously weft thread 5 released with the control of the main nozzle and blocked at the end of the weft insertion on the drum 3a and, if necessary, a thread braking device brakes the weft.
- the stopper device and the yarn braking means are provided with known per se in Figure 2 means 10,11,12,13 and 14 in connection to the means of a desired-actual value comparison between at least the sizes .DELTA.t 1 and At 1 'information on To achieve synchronization of the switching times between the solenoid valve of the main nozzle and the at least one stopper device of a pre-winding device 3 working with the weaving machine.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Überwachen des Schussfadenfreigabe- und Stoppvorganges an Vorspulgeräten, die insbesondere mit Luftdüsenwebmaschinen in Wirkverbindung stehen.The invention relates to a method for monitoring the weft release and Stopping process on pre-winding devices, in particular with air jet looms in Active connection.
Bekannt ist, dass moderne, schnell laufende Luftdüsenwebmaschinen mit sogenannten
Vorspulgeräten in Verbindung stehen, durch die, entsprechend der
Schussfadeneintragsleistung der Webmaschine, die Schussfäden in vorbestimmten Längen
freigegeben werden.
Dem Freigeben einer definierten Schussfadenlänge folgt steuerungstechnisch das Stoppen der
freigegebenen Schussfadenlänge.
Der auf einer Trommel des Vorspulgerätes aufgewickelte Schussfaden wird dabei
abzugsseitig der Trommel von einem sogenannten Fadenstopper im Sinne einer Klemme
gehalten.
Im Prozess des Schussfadeneintragens sind die Hauptdüse der Luftdüsenwebmaschine und
das Vorspulgerät derart elektrisch angesteuert, dass der Fadenstopper des Vorspulgerätes die
Schussfadenlänge synchron mit der elektrischen Ansteuerung des elektromagnetischen
Steuerventils der Hauptdüse freigibt und der Fadenstopper am Ende des
Schussfadeneintragprozesses die Schussfadenfreigabe blockiert. Dadurch wird erreicht, dass
nur die Schussfadenlänge von dem Vorspulgerät freigegeben wird, die der notwendigen
Schussfaden-Eintragslänge entspricht. Diese notwendige bzw. definierte Schussfadenlänge
wird dabei dadurch erreicht, dass die Trommel des Vorspulgerätes im Durchmesser
verstellbar ist und so eine ganzzahlige Anzahl von Windungen aufnimmt und freigibt, die der
Schussfadeneintragslänge entspricht.
Bekannte Ausführungen von Vorspulgeräten besitzen wenigstens einen Fadenstopper, der
radial zum Trommeldurchmesser bewegbar ist und dabei den Schussfaden freigibt oder
stoppt.
Gemäss EP 0 544 730 B1 wird die wenigstens eine Stoppereinrichtung elektromagnetisch
direkt betätigt oder auch indirekt im Zusammenhang mit dem Schalten eines
elektromagnetisch betätigbaren Ventils der Hauptdüse betätigt.
Die synchrone Betriebsweise der elktromagnetischen Stoppereinrichtung des Vorspulgerätes
und des Magnetventils der Hauptdüse einer Luftdüsenwebmaschine setzt voraus, wie aus der
EP 0 544 730 B 1 hervorgeht, dass sowohl die Zeitpunkte zur Freigabe und zum Stoppen des
Schussfadens als auch die Funktionszeiten der Hauptdüse in Übereinstimmung sind oder sich
in vertretbaren Grenzen bewegen. Ob im Laufe des Webbetriebes die notwendigen
Voraussetzungen der synchronen Betriebsweise weiter bestehen, unterliegen nach dem Stand
der Technik keiner Überwachung.
Zum Beispiel in dem Fall, dass der Stopper des Vorspulgerätes den Schussfaden zu einem
Zeitpunkt freigibt, der wenige Millisekunden nach dem Funktionszeitpunkt für den
Schussfadeneintrag der Hauptdüse liegt, wird der Schussfaden zwischen dem Vorspulgerät
und der Hauptdüse einer relativ hohen Fadenzugkraft ausgesetzt. Diese Fadenzugkraft kann
je nach Garnparameter, wie z.B. Zugfestigkeit, unmittelbar während der vorgenannten relativ
kurzen Zeitspanne oder beim weiteren Verlauf des Schussfadeneintragprozesses zu einem
sogenannten Schussfadenbruch führen.
Ohne eine vergleichende Überwachung der Funktionszeiten der Stoppereinrichtung des
Vorspulgerätes, also der Zeitpunkte; zu denen der Stopper den Schussfaden freigeben und
stoppen muss, und des Funktionszeitpunktes der Hauptblasdüse, also des Zeitpunktes, an
dem der Schussfadeneintrag erfolgt, ist ein direktes Erkennen der Ursache eines
Schussfadenbruchs nicht möglich.
Auch ein Stoppen des Schussfadens zu einem Zeitpunkt, der nach dem steuerungsseitig
vorgegebenen Stoppzeitpunkt liegt, führt zu Produktionsstörungen, weil von der Trommel
des Vorspulgerätes eine weitere ganzzahlige Fadenwindung abgegeben wird, die für den
Schussfadeneintrag zunächst nicht benötigt wird.
Die Produktionsstörung kann hier im Bilden von Schussfadenschlingen liegen, die ebenfalls
Ursache von Schussfadenbrüchen sein können.It is known that modern, fast-running air jet looms are connected to so-called prewinding devices, by means of which the weft threads are released in predetermined lengths in accordance with the weft insertion performance of the loom.
In terms of control technology, the release of a defined weft thread length is followed by the stopping of the released weft thread length.
The weft thread wound on a drum of the prewinder is held on the take-off side of the drum by a so-called thread stopper in the sense of a clamp.
In the weft insertion process, the main nozzle of the air jet weaving machine and the prewinder are electrically controlled in such a way that the thread stopper of the prewinder releases the weft length synchronously with the electrical control of the electromagnetic control valve of the main nozzle and the thread stopper blocks the weft release at the end of the weft insertion process. This ensures that only the weft thread length is released from the prewinder that corresponds to the necessary weft thread insertion length. This necessary or defined weft thread length is achieved in that the diameter of the drum of the prewinder is adjustable and thus picks up and releases an integer number of turns which corresponds to the weft thread insertion length.
Known designs of prewinding devices have at least one thread stopper which can be moved radially to the drum diameter and thereby releases or stops the weft thread.
According to EP 0 544 730 B1, the at least one stop device is actuated electromagnetically directly or also indirectly in connection with the switching of an electromagnetically actuated valve of the main nozzle.
The synchronous operation of the electromagnetic stopper device of the prewinder and the solenoid valve of the main nozzle of an air jet weaving machine requires, as can be seen from EP 0 544 730 B1, that both the times for releasing and stopping the weft thread and the operating times of the main nozzle are in agreement or are within reasonable limits. The state of the art does not monitor whether the necessary conditions for synchronous operation continue to exist during web operation.
For example, in the event that the stopper of the pre-winder releases the weft at a point in time which is a few milliseconds after the point in time for the weft insertion of the main nozzle, the weft between the pre-winder and the main nozzle is subjected to a relatively high thread tension. Depending on the yarn parameters, such as tensile strength, this thread tensile force can lead to a so-called weft thread break during the aforementioned relatively short period of time or as the weft thread insertion process continues.
Without comparative monitoring of the functional times of the stopper device of the prewinding device, that is, the times; at which the stopper has to release and stop the weft and the time of operation of the main blowing nozzle, i.e. the time at which the weft is inserted, it is not possible to directly identify the cause of a weft break.
Stopping the weft thread at a point in time that is later than the stopping point specified by the control system also leads to production disruptions, because a further whole-number thread turn is emitted by the drum of the prewinder, which is not initially required for the weft thread insertion.
The production disruption can lie in the formation of weft loops, which can also be the cause of weft breaks.
Aus der DE 196 02 513 C1 ist ein Verfahren zum Überwachen der Funktionstüchtigkeit
elektrisch ansteuerbarer Magnetventile in Webmaschinen bekannt.
Hintergrund der Erfindung ist, dass frühzeitig ein möglicher Ausfall der in Webmaschinen
verwendeten pneumatisch betriebenen und elektrisch ansteuerbaren Hilfsaggregate erkannt
werden kann.
Bei der Lösung der Aufgabe ist man von der allgemeinen Kenntnis ausgegangen, dass alle
elektromagnetischen Systeme, so auch elektrisch angesteuerte Magnetventile, einen
charakteristischen Kurvenverlauf des Steuerstromes (I) über die Zeit (t) aufweisen.
Die besondere Charakteristik des Steuerstromes (I) über die Zeit (t) stellt sich im
aufsteigenden Teil einer Kurve als kurzzeitiger Stromeinbruch dar.
Dieser Stromeinbruch ergibt sich regelmäßig, wenn der Magnetkreis bei einem
Elektromagnetsystem geschlossen wird.DE 196 02 513 C1 discloses a method for monitoring the functionality of electrically controllable solenoid valves in weaving machines.
The background to the invention is that a possible failure of the pneumatically operated and electrically controllable auxiliary units used in weaving machines can be recognized at an early stage.
When solving the problem, it is assumed that all electromagnetic systems, including electrically controlled solenoid valves, have a characteristic curve of the control current (I) over time (t).
The special characteristic of the control current (I) over time (t) is shown in the rising part of a curve as a brief current drop.
This current drop occurs regularly when the magnetic circuit is closed in an electromagnetic system.
Vor diesem Hintergrund ist es Aufgabe der Erfindung, die Ist-Schaltzeiten der Stoppereinrichtung eines mit einer Webmaschine wirkverbundenen Vorspulgerätes im Hinblick auf unzulässige Abweichungen gegenüber Soll-Schaltzeiten zu überwachen.Against this background, it is an object of the invention to determine the actual switching times of the Stopper device of a pre-winder operatively connected to a weaving machine in the Monitor with regard to impermissible deviations from target switching times.
Erfindungsgemäß wird die Aufgabe durch die Anwendung der an sich bekannten
Verfahrensschritte gem. der Erfindung nach der DE 196 02 513 C1 gelöst.
Danach wird nun auch bei elektrischer Ansteuerung der elektromagnetischen
Stoppereinrichtung eines Vorspulgerätes der charakteristische Stromverlauf einer aus einer
Spule, eines federbelasteten Stoppers und eines ersten und zweiten Positionssignalgebers für
den Stopper bestehenden Einrichtung erfasst.
Erfindungswesentlich ist danach, dass der kurzzeitige Einbruch des Steuerstromes, der sich
regelmäßig ergibt, wenn der Magnetkreis bei einem elektromagnetisch betriebenen System
geschlossen wird, im aufsteigenden Teil einer Kurve über die Zeit messtechnisch erfasst und
in einem Diagramm dargestellt wird.According to the invention, the object is achieved in accordance with the method steps known per se. solved the invention according to DE 196 02 513 C1.
Thereafter, the characteristic current profile of a device consisting of a coil, a spring-loaded stopper and a first and second position signal transmitter for the stopper is now also detected when the electromagnetic stopper device of a pre-winding device is electrically actuated.
It is essential to the invention that the brief drop in the control current, which occurs regularly when the magnetic circuit in an electromagnetically operated system is closed, is measured over time in the ascending part of a curve and is shown in a diagram.
Das Auftreten dieses kurzzeitigen Stromeinbruchs zum Zeitpunkt der Ansteuerung tein wird
mit Δ t1 als Sollwert vorgegeben und mit einem ermittelten Istwert Δ t1' verglichen. Für den
Fall, dass der ermittelte Istwert Δ t1' außerhalb des vorgegebenen Zeitpunktes Δ t1
(Sollwert) oder eines vorgegebenen Zeitfensters (Sollwertbereich) liegt, wird eine
Fehlermeldung in der Steuerung der Webmaschine generiert, die zum Unterbrechen des
Webprozesses führt.
Wenn mehrmals hintereinander die gleiche Abweichung vom vorgegebenen Sollwert oder
Sollwertbereich auftritt, kann erfindungsgemäß ein Verlegen des Ansteuerzeitpunktes der
Stoppereinrichtung im Sinne einer zeitlichen Vorverlegung oder Verzögerung erfolgen.The occurrence of this transient current slump at the time of actuation is with a t Δ t 1 defined as a target value and with a determined actual value Δ t 1 'compared. In the event that the determined actual value .DELTA.t 1 ' lies outside the predetermined time .DELTA.t 1 (setpoint) or a predetermined time window (setpoint range), an error message is generated in the control of the weaving machine, which leads to the interruption of the weaving process.
If the same deviation from the specified setpoint or setpoint range occurs several times in succession, the actuation time of the stopper device can be moved according to the invention in the sense of an advance or delay.
Erfolgt die Freigabe des Schussfadens durch die Stoppereinrichtung elektromagnetisch mit federbelastetem Stopper, so wird in Ausgestaltung der Erfindung zur Kontrolle der Stoppfunktion ein Weg- oder Positionssignal generiert. Dafür kommen z.B. als Mittel Lichtschranken, Initiatoren, Hallsensoren und dgl. in Frage.The weft thread is released electromagnetically by the stopper device spring-loaded stopper, so in an embodiment of the invention to control the Stop function generates a path or position signal. For this come e.g. as a means Photoelectric sensors, initiators, Hall sensors and the like in question.
Bei Verwendung eines Umkehrhubmagneten z.B. tritt das charakteristische Merkmal des
kurzzeitigen Einbruchs des Steuerstroms (I) sowohl bei dem Freigeben als auch beim
Stoppen des Schussfadens durch den Fadenstopper auf.
Erfindungsgemäß kann nun in weiterer Ausgestaltung der Erfindung wahlweise das erste
oder zweite charakteristische Merkmal zur Schaltzeitüberwachung der Stoppereinrichtung
verwendet werden.When using a reversing lifting magnet, for example, the characteristic feature of the brief drop in the control current (I) occurs both when the thread stopper releases and when the weft thread is stopped.
According to the invention, in a further embodiment of the invention, the first or second characteristic feature can optionally be used for monitoring the switching time of the stopper device.
Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert.The invention is explained in more detail using an exemplary embodiment.
In den Zeichnungen zeigen:
- Figur 1
- ein Diagramm mit dem Verlauf des Steuerstroms (I) eines elektrisch angesteuerten elektromagnetischen Systems über die Ansteuerzeit (t),
Figur 2- ein Blockschaltbild, nach welchem die Messwerte und/oder der Steuerstromverlauf erfasst und verglichen wird,
Figur 3- ein Vorspulgerät in schematischer Darstellung mit der Stoppereinrichtung.
- Figure 1
- 1 shows a diagram with the course of the control current (I) of an electrically controlled electromagnetic system over the control time (t),
- Figure 2
- 2 shows a block diagram, according to which the measured values and / or the control current curve are recorded and compared,
- Figure 3
- a pre-winding device in a schematic representation with the stopper device.
Im Diagramm gemäß Figur 1 ist auf der Ordinate der Steuerstrom I und auf der Abszisse die
Zeit t des wirksamen Steuerstroms einer an eine Gleichstromquelle VDC angeschlossenen
Stoppereinrichtung bzw. einer nicht dargestellten Fadenbremseinrichtung eines
Vorspulgerätes 1 gemäß Figur 3 aufgetragen.
Der Stromverlauf in einem elektromagnetischen System, wie es die Stopper- oder die
Fadenbremseinrichtung darstellt, ist bekannt.
Demnach ist auch bekannt, dass sich im aufsteigenden Teil 1a der Stromverlaufskurve 1 ein
kurzzeitiger Stromeinbruch nach dem Ansteuern tein der Stopper- oder
Fadenbremseinrichtung zu einem Zeitpunkt Δt1 als charakteristisches Merkmal 2 einer
solchen Kurve 1 ergibt.
Dieses charakteristische Merkmal 2 tritt auf, wenn sich der Magnetkreis der aus wenigstens
der Spule 7 und dem Stopper 4 bestehenden Stoppereinrichtung oder der Magnetkreis der
nicht dargestellten Fadenbremseinrichtung schließt.In the diagram according to FIG. 1, the control current I is plotted on the ordinate and the time t of the effective control current of a stop device connected to a direct current source VDC or a thread braking device of a spooling device 1 according to FIG. 3, not shown, is plotted on the abscissa.
The current profile in an electromagnetic system, such as the stopper or thread braking device, is known.
Accordingly, it is also known, the current characteristic curve 1 that in the ascending part 1a, a brief current slump after driving the stopper or a t yarn braking device yields at a time .DELTA.
This
Bei Vorspulgeräten, die mit wenigstens einer elektromagnetisch wirkenden
Stoppereinrichtung und mit einer elektromagnetischen Fadenbremseinrichtung ausgerüstet
sind und die in Webmaschinen, insbesondere in Luftdüsenwebmaschinen Anwendung finden,
ist beim Ansteuern der Stoppereinrichtung oder der Fadenbremseinrichtung das Auftreten des
charakteristischen Merkmals 2' zu einem Zeitpunkt Δt1', dessen Abweichung in Zeit und
Größe gegenüber einem charakteristischen Merkmal 2 zu einem Zeitpunkt Δt1 oder das
Ausbleiben des charakteristischen Merkmals 2 ein Indikator für die Funktionstüchtigkeit der
erwähnten Einrichtungen eines Vorspulgerätes oder ein Indikator für einen schädliche
Asynchronität im Zusammenspiel zwischen dem Schusseintragssystem der Webmaschine
und dem Vorspulgerät 3.In the case of prewinding devices which are equipped with at least one electromagnetic stopper device and with an electromagnetic thread brake device and which are used in weaving machines, in particular in air jet weaving machines, when the stopper device or the thread brake device is activated, the occurrence of the characteristic feature 2 'at a time Δt 1' , its deviation in time and size compared to a
Das charakteristische Merkmal 2 bei Δt1 der Kurve 1 gemäß Figur 1 wird z.B. durch eine
Spitzenwertdetektion überwacht. Das Detektionssignal wird an eine an sich bekannte
Messschaltung 10 weiter geleitet, siehe auch Figur 2.
Das charakteristische Merkmal 2 bei Δt1 stellt sich beim Ansteuern (Einschalten) jeder
Stoppereinrichtung oder jeder Fadenbremse durch hier nicht näher genannte Mittel einer
Webmaschinensteuerung dar.The
The
Bleibt das charakteristische Merkmal 2 während des Ansteuerns im Webprozess aus oder
wird über die Messwertschaltung 10, Messwertaufnehmer 11 und Referenzwertaufnehmer 12
mittels des Vergleichers 13 z.B. eine Zeitdifferenz zwischen dem als Referenzwert Δt1
(Sollwert) abgelegten und dem gemessenen Δt1' (Istwert) festgestellt, die außerhalb eines
Toleranzbereiches liegt, erhält die betreffende Steuereinrichtung der Webmaschine ein
Signal, das entweder das Ausbleiben des charakteristischen Merkmals 2 im Steuerstrom 1 der
Stoppereinrichtung oder der Fadenbremseinrichtung anzeigt und/oder ein Unterbrechen des
Webprozesses auslöst.If the
Auf der Abszisse gemäß Figur 1 ist beispielhaft ein gemessener Istwert Δt1' für das Auftreten
des charakteristischen Merkmals 2' dargestellt. Diese Ist-Zeitdauer Δt1' und/oder die Ist-Steuerstromkurve
1' wird als Messwert erfasst. Diese Messwerte werden mit den
Referenzwerten in dem Vergleicher 13 gemäß Figur 2 verglichen.
In Abhängigkeit von der Größe eines aus den Zeiten Δt1 und Δt1' ermittelten Differenzwertes
und/oder eine sich jeweils aus zwei miteinander verglichenen Kurvenverläufen 1 und 1'
ergebende Differenz im Auftreten des charakteristischen Merkmals 2 bzw. 2' wird der
Zeitpunkt tein, der dem Ansteuerzeitpunkt der Stoppereinrichtung 4,7 gemäß Figur 3 oder der
nicht dargestellten Fadenbremseinrichtung entspricht, korrigiert. Wichtig ist dabei, dass
zumindest der Differenzwert zwischen Δt1 und Δt1' einen vorgegebenen Toleranzbereich nicht
über- oder unterschreitet.
Wird im Verlaufe der Betriebszeit des Vorspulgerätes 1 z.B. ein Überschreiten des
Toleranzbereiches festgestellt, so wird dies durch ein diesbezügliches Signal angezeigt, das
mit dem Unterbrechen des Webprozesses einhergehen kann.A measured actual value .DELTA.t 1 ' for the occurrence of the characteristic feature 2' is shown as an example on the abscissa according to FIG. This actual time period Δt 1 ' and / or the actual control current curve 1' is recorded as a measured value. These measured values are compared with the reference values in the
Depending on the size of a from the time .DELTA.t 1 and .DELTA.t 'determined difference value and / or one of two compared with each other curves 1 and 1 are each' 1 resulting difference in the appearance of the
If, for example, the tolerance range is determined to be exceeded in the course of the operating time of the prewinding device 1, this is indicated by a signal relating to this, which can be associated with the interruption of the weaving process.
Das in Figur 3 schematisch dargestellte Vorspulgerät 3 besitzt eine Trommel 3a, auf der ein
von einer nicht dargestellten Fadenspule abgezogener Schussfaden 5 aufgewickelt ist.
Der Schussfaden 5 wird im Webprozess von der Trommel 3a über Kopf durch ein nicht
dargestelltes Schussfadeneintragsorgan über eine Fadenführung 8 abgezogen. The
In the weaving process, the
In einer Luftdüsenwebmaschine ist das Schussfadeneintragsorgan die Hauptdüse.
Das Schussfadeneintragsorgan ist dabei so gesteuert, dass die Stoppereinrichtung, bestehend
aus der Spule 7, dem mit einer Feder 4a belasteten Fadenstopper 4 und der wenigstens einen
Detektiereinrichtung 6, oder z.B. eine in Abzugsrichtung des Schussfadens, siehe
Pfeilrichtung 9, angeordnete Fadenbremseinrichtung den Schussfaden 5 synchron mit der
Ansteuerung der Hauptdüse freigibt und am Ende des Schussfadeneintrags auf der Trommel 3a
blockiert und gegebenenfalls eine Fadenbremseinrichtung den Schussfaden bremst.
Die Stoppereinrichtung und die nicht dargestellte Fadenbremseinrichtung stehen mit den in
Figur 2 an sich bekannten Mitteln 10,11,12,13 und 14 in Verbindung, um mittels eines Soll-Istwert-Vergleichs
zwischen wenigstens den Größen Δt1 und Δt1' Aufschluss über die
Synchronisation der Schaltzeiten zwischen dem Magnetventil der Hauptdüse und der
wenigstens einen Stoppereinrichtung eines mit der Webmaschine zusammenarbeitenden
Vorspulgerätes 3 zu erzielen.In an air jet weaving machine, the weft insertion element is the main nozzle. The weft thread insertion member is controlled in such a way that the stopper device, consisting of the
Claims (9)
- Method for monitoring the weft thread releasing and stopping operation on prewinders for looms, according to which preferably an electromagnetically acting stopping device, as a consequence of electrical control, intermittently releases a predetermined, integral number of weft thread windings at a predetermined point in time to a loom and intermittently stops the release, characterised in that during the electrical control of the stopping device an occurring characteristic feature (2) known per se is used in the course of the control current (I) over the time (t) as a significant variable for establishing the proper service condition of the prewinder (3).
- Method according to claim 1, characterised in that the absence of the characteristic feature (2) or a recognised time lag of the characteristic feature signals the control of the loom.
- Method according to claim 1, characterised in that the correct function weft thread release is monitored by a comparison of set-point and actual values between the characteristic feature (2) occurring at a time Δ t1 and the characteristic feature appearing at a time Δ t1' differing from Δ t1.
- Method according to claim 1, characterised in that the correct function weft thread stopping is generated by a position signal released by the stopping device (4).
- Method according to claim 4, characterised in that the stop function of the stopping device (4) is effected by mechanical resetting of the stopping device.
- Method according to claim 1, characterised in that when using a reversible lifting magnet for the stopping device, monitoring of the lifting movements of the stopping device (4) is effected either by means of the characteristic feature (2) on release or by means of the characteristic feature on stopping of the weft thread (5).
- Method according to claims 1 to 6, characterised in that repeated deviation of the time Δ t1' from the time Δ t1 interprets the stopping device as worn, and a corresponding report is produced.
- Loom, especially an air jet loom having a weft thread insertion system consisting of at least one main air jet and a plurality of auxiliary air jets, the main air jet and the auxiliary air jets being in connection with electrically controllable solenoid valves, having at least one prewinder (3) having preferably an electrically controllable electromagnetic weft thread stopping device, characterised in that, for monitoring the proper service condition of the solenoid valves, a characteristic feature (2) known per se occurring in the control current of the solenoid valves is used for a comparison of set point values and actual values and in that, in addition to using the characteristic feature (2) for monitoring the solenoid valves, the characteristic feature (2) occurring in the control current (I) of the weft thread stopping device is used to monitor the proper service condition of the weft thread stopping device, and in that at least the characteristic feature (2) for monitoring the main air jet valve and the characteristic feature (2) for monitoring the stopping device are checked in a loom control for time coincidence and an error signal is generated for an alert and/or for switching off the loom whenever at least one characteristic feature (2) lies outside a time coincidence window.
- Loom according to claim 8, characterised in that the time of coincidence or the time coincidence window corresponds to an angle of rotation or range of angular rotation of the main shaft of the loom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19824613A DE19824613A1 (en) | 1998-06-02 | 1998-06-02 | Process for monitoring the weft release and stopping process on winding machines for looms |
| DE19824613 | 1998-06-02 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0962566A2 EP0962566A2 (en) | 1999-12-08 |
| EP0962566A3 EP0962566A3 (en) | 2001-05-23 |
| EP0962566B1 true EP0962566B1 (en) | 2003-10-29 |
Family
ID=7869666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99109509A Expired - Lifetime EP0962566B1 (en) | 1998-06-02 | 1999-05-12 | Method for controlling weft releasing and stopping operation on yarn storage devices in looms |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6176272B1 (en) |
| EP (1) | EP0962566B1 (en) |
| JP (1) | JPH11350301A (en) |
| DE (2) | DE19824613A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE516603C2 (en) * | 2001-02-16 | 2002-02-05 | Texo Ab | Method and apparatus for length measuring and storing thread in weaving or textile machines |
| DE10151780C1 (en) * | 2001-10-19 | 2003-05-22 | Dornier Gmbh Lindauer | Method and device for influencing the thread braking force of a weft thread brake arranged between a yarn supply system and a thread store of a weaving machine |
| US7614948B2 (en) * | 2003-09-15 | 2009-11-10 | Igt | Multi-player bingo with slept awards reverting to progressive jackpot pool |
| US7398431B2 (en) * | 2004-12-20 | 2008-07-08 | Emc Corporation | System and method of dynamically setting a fault threshold for an operational module |
| JP7260387B2 (en) * | 2019-05-06 | 2023-04-18 | 津田駒工業株式会社 | Weft inserting method and apparatus for water jet loom |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS179657B1 (en) | 1975-06-10 | 1977-11-30 | Juraj Spisiak | Wiring of apparatus for controlling active elements of weft inserting duct in jet weaving machines |
| JPS58208446A (en) | 1982-05-31 | 1983-12-05 | 津田駒工業株式会社 | Weft yarn detection for jet loom |
| US4516076A (en) * | 1982-09-17 | 1985-05-07 | The Singer Company | Fault detection arrangement for relay switching system |
| BE899671A (en) * | 1984-05-16 | 1984-11-16 | Picanol Nv | Air jet weaving loom has multi:weft injection and transport jets - with sequenced timing control program modulated by measured weft speeds |
| DE3818766A1 (en) | 1988-06-02 | 1989-12-07 | Dornier Gmbh Lindauer | NOZZLE CONTROL FOR AN AIR Loom |
| DE3843683A1 (en) | 1988-12-23 | 1990-06-28 | Dornier Gmbh Lindauer | Weft thread monitor for air weaving machines |
| US4932246A (en) * | 1989-02-22 | 1990-06-12 | Motorola, Inc. | Diagnostic fault test system and circuit |
| DE59005721D1 (en) * | 1989-09-01 | 1994-06-23 | Rueti Ag Maschf | Procedure for adjusting the weft stretch in the compartment and the air consumption of the relay nozzles of an air jet loom. |
| DE4026434A1 (en) | 1990-08-21 | 1992-02-27 | Iro Ab | METHOD FOR CONTROLLING A WIFE DELIVERY AND MEASURING DEVICE AND WIFE DELIVERY AND MEASURING DEVICE |
| JP2701545B2 (en) * | 1990-12-29 | 1998-01-21 | 株式会社豊田自動織機製作所 | Pressure controller for weft insertion in jet loom |
| JP2745848B2 (en) | 1991-03-25 | 1998-04-28 | 住友金属工業株式会社 | High-strength ERW steel pipe for automobiles with excellent fatigue properties |
| JP2970074B2 (en) | 1991-05-29 | 1999-11-02 | 株式会社豊田自動織機製作所 | Pressure control method for jet loom |
| JP3606330B2 (en) * | 1991-07-09 | 2005-01-05 | 津田駒工業株式会社 | Jet loom weft insertion control method and apparatus |
| JPH05230739A (en) | 1992-01-27 | 1993-09-07 | Toyota Autom Loom Works Ltd | Control device for jetting pressure of subnozzle in jet loom |
| DE4317109A1 (en) * | 1993-05-21 | 1994-11-24 | Herion Werke Kg | Method for checking solenoid valves and associated measuring arrangement |
| DE19602513C1 (en) * | 1996-01-25 | 1996-10-02 | Dornier Gmbh Lindauer | Monitoring functioning of magnetic valves in looms |
-
1998
- 1998-06-02 DE DE19824613A patent/DE19824613A1/en not_active Ceased
-
1999
- 1999-05-12 EP EP99109509A patent/EP0962566B1/en not_active Expired - Lifetime
- 1999-05-12 DE DE59907506T patent/DE59907506D1/en not_active Expired - Fee Related
- 1999-06-02 US US09/324,243 patent/US6176272B1/en not_active Expired - Fee Related
- 1999-06-02 JP JP11155261A patent/JPH11350301A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US6176272B1 (en) | 2001-01-23 |
| JPH11350301A (en) | 1999-12-21 |
| EP0962566A3 (en) | 2001-05-23 |
| DE19824613A1 (en) | 1999-12-09 |
| DE59907506D1 (en) | 2003-12-04 |
| EP0962566A2 (en) | 1999-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69107536T2 (en) | Device for tension regulation and withdrawal of weft yarn in weaving machines. | |
| EP0605550B1 (en) | Process and power loom | |
| EP0605531B1 (en) | Power loom and insertion brake for power looms | |
| DE60006781T2 (en) | WEAVING MACHINE WITH AN ENTRY BRAKE | |
| DE2854257C2 (en) | Textile machine | |
| EP0090911A2 (en) | Method and apparatus to optimize a work occurrence at each working station of a textile machine | |
| WO2001017886A1 (en) | Method for controlling a yarn processing system and a yarn processing system | |
| EP0962566B1 (en) | Method for controlling weft releasing and stopping operation on yarn storage devices in looms | |
| DE10151780C1 (en) | Method and device for influencing the thread braking force of a weft thread brake arranged between a yarn supply system and a thread store of a weaving machine | |
| CH667886A5 (en) | METHOD AND DEVICE FOR CONTROLLING A LUNTENSTOP ARRANGEMENT OF A SPINNING MACHINE. | |
| DE3711793C2 (en) | ||
| DE69107517T3 (en) | Weft feed device for rapier weaving machines. | |
| EP0656437A1 (en) | Process for supplying and inserting weft in the fabric of a loom and supplying device | |
| DE4338283A1 (en) | Textile machine producing cross-wound bobbins | |
| DE10210911A1 (en) | Device for detecting and / or adjusting a tensile force in a thread | |
| DE102014118743B4 (en) | Method for controlling the thread delivery of a thread delivery device and thread delivery device | |
| DE3644433A1 (en) | METHOD AND DEVICE FOR CONTROLLING A SPOOL OF A TEXTILE MACHINE PRODUCING CROSS COILS | |
| EP1141456B1 (en) | Yarn processing system and method for delivering weft yarns | |
| EP0786546B1 (en) | Process to control the operation of electrically controlled magnetic valves in looms | |
| DE4413047C2 (en) | Method and device for brake monitoring the DC motor of a printing press | |
| DE2848587C2 (en) | Release device for the automatic rapid braking of moving machine parts, in particular of weaving machines | |
| DE3117750A1 (en) | METHOD AND DEVICE FOR MONITORING A LIFESTYLE WORKING WITH FLUID MECHANISM | |
| EP3875410A1 (en) | Spinning or winding machine and method for operating a spinning or winding machine | |
| EP3159442B1 (en) | Method for controlling the thread supply of a thread supply device and thread supply device | |
| WO2004069712A1 (en) | Thread take-off device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE CH DE FR GB IT LI SE |
|
| AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
| 17P | Request for examination filed |
Effective date: 20010730 |
|
| AKX | Designation fees paid |
Free format text: BE CH DE FR GB IT LI SE |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE CH DE FR GB IT LI SE |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REF | Corresponds to: |
Ref document number: 59907506 Country of ref document: DE Date of ref document: 20031204 Kind code of ref document: P |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: R. A. EGLI & CO. PATENTANWAELTE |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20040206 |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20040730 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20050404 Year of fee payment: 7 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20050428 Year of fee payment: 7 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060512 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20060512 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20070131 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060531 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20090525 Year of fee payment: 11 Ref country code: IT Payment date: 20090521 Year of fee payment: 11 Ref country code: DE Payment date: 20090408 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20090427 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20090414 Year of fee payment: 11 |
|
| BERE | Be: lapsed |
Owner name: *LINDAUER DORNIER G.M.B.H. Effective date: 20100531 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| EUG | Se: european patent has lapsed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100531 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100531 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100513 Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100512 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100531 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20101201 |