EP2034061A1 - Cutting device for a loom and method for operating the same - Google Patents
Cutting device for a loom and method for operating the same Download PDFInfo
- Publication number
- EP2034061A1 EP2034061A1 EP08161824A EP08161824A EP2034061A1 EP 2034061 A1 EP2034061 A1 EP 2034061A1 EP 08161824 A EP08161824 A EP 08161824A EP 08161824 A EP08161824 A EP 08161824A EP 2034061 A1 EP2034061 A1 EP 2034061A1
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- EP
- European Patent Office
- Prior art keywords
- cutting
- spring
- cutting device
- pneumatic actuator
- weaving machine
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005520 cutting process Methods 0.000 title claims description 121
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000009941 weaving Methods 0.000 claims description 31
- 238000003825 pressing Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/70—Devices for cutting weft threads
Definitions
- the invention relates to a cutting device for a loom according to the preamble of claim 1 and a method for operating the same according to the preamble of claim 8 and a weaving machine with such a cutting device and for carrying out such a method.
- the various weaving machine types such as air jet loom, rapier weaving machine or projectile weaving machine, are named based on the type of weft insertion.
- rapier weaving the weft thread is registered for example by means of a fixed to a rod or a flexible belt rapier in a shed and taken over at a transfer point in the middle part of the shed of a gripper and carried on.
- the Bringergreifer has the task to take the presented by means of a thread roving weft safe to enter the same in the shed and precisely feed the gripper rapier.
- the submitted weft thread must be separated from the previously entered weft before it can be entered into the shed.
- a cutting device which comprises a fixed and a movable cutting edge.
- the movable blade is formed on a cranked lever which communicates with a pneumatic cylinder containing a piston and a spring.
- the cutting device is at rest by acting on the piston Spring kept open.
- the compressed air cylinder is acted upon by a control valve with compressed air.
- the rapier grippers are moved at high speed during weft insertion.
- the rapier has a speed of typically 20 m / s, i. he travels a distance of 2 cm in 1 ms. Accordingly, the cutting device must be able to separate the weft within a period of a few ms, since this is not cut clean but torn off.
- the object of the invention is to provide a cutting device for a weaving machine, in particular a rapier weaving machine, and a method for separating a weft thread to be introduced into a shed of a weaving machine, in particular a rapier weaving machine, which are capable of the weft thread within a period of time cleanly separated from a few ms.
- Another object of the invention is to provide a weaving machine with such a cutting device and for carrying out such a method.
- the cutting device according to the invention for a weaving machine comprises a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive, which cooperates with the second cutting carrier, and a pneumatic actuator and a feather contains one in a shed to be entered or registered weft thread, wherein the spring by means of the pneumatic actuator can be tensioned and optionally the two cutting edges are moved apart, and wherein by means of the force of the spring, the two cutting edges are closed.
- the second, movable blade carrier is designed as a lever arm, in particular as a rotatable or rotatably mounted lever arm.
- the pneumatic actuator as a piston / cylinder unit or pneumatic rotary drive are formed, and / or the spring formed as a compression spring, in particular as a helical compression spring, wherein the spring may be arranged for example in the piston / cylinder unit.
- the cutting device comprises a control valve for controlling the pneumatic actuator, for example for pressurizing the actuator to tension the spring and optionally to move the blades apart, and / or for venting the actuator to trigger the cutting operation.
- the cutting device additionally comprises a sensor for detecting the cutting time and occasionally a control and control unit, which may be connected to the sensor and the control valve to automatically correct possible deviations from a predetermined cutting time.
- a cutting device which has a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive includes, which cooperates with the second blade carrier, and containing a pneumatic actuator and a spring, and separated the weft thread by means of the cutting device.
- the spring is / are tensioned by means of the pneumatic actuator, the two blades are opened and used to separate the actuator Weft the two cutting edges closed by the force of the spring.
- the pneumatic actuator is controlled by means of a control valve.
- the spring is tensioned and optionally the blades are moved apart by applying pressure to the pneumatic actuator, and / or the cutting process is triggered by the pneumatic actuator being vented.
- the cutting time is / are detected with a sensor and possible deviations between the detected cutting time and a predetermined cutting time are automatically corrected.
- the invention comprises a weaving machine, in particular a rapier weaving machine with a cutting device according to one of the embodiments and variants described above and / or equipped for carrying out a method according to the above description.
- the cutting device according to the invention and the method according to the invention for separating a weft thread to be introduced or inserted into a shed have the advantage that the spring can store enough potential energy to safely separate the weft thread, that the potential energy of the spring at least in principle less than 1 ms can be converted into kinetic energy, and the pneumatic actuator and the pressure supply of the same can be designed so that this comparatively slow spring, for example, within 30 ms, tensioned. Compared to a direct drive the closing movement by the pneumatic actuator, as described in the cited prior art, this results in significant savings.
- Fig. 1 shows a schematic view of an embodiment of a loom, as used in the context of the present invention.
- the weaving machine 1 is formed in the illustrated embodiment as a rapier and includes a Bringergreifer 3 and a Holergreifer 4, each containing a thread clamp to receive a recorded weft yarn 2 and hold.
- the Bringerund Holergreifer is typically each attached to a rod, not shown, or a flexible band, not shown, which are displaced and driven in the insertion direction.
- the weft thread can be entered into a shed and at a transfer point in the middle part of the shed from the gripper rapier be taken over and forwarded.
- the weaving machine may comprise, for example, a yarn package 2a and a yarn storage 2b, from which the weft yarn 2 can be withdrawn, and occasionally a yarn brake 5 and / or a sensor 6 to measure the yarn tension and / or optionally a thread rug or a color picker 7 with several Fadenvorlegern and / or a control unit 9 for controlling the weft insertion.
- the weaving machine comprises a cutting device 10 for separating the weft thread 2, for example as shown in FIG Fig. 1 shown to be separated from the previously entered weft before it is entered into the shed.
- Fig. 2 shows a detailed view of a rapier 3 and a cutting device 10 of the embodiment of Fig. 1 before separating the weft.
- the weft thread 2 to be inserted and picked up by the picking rapier 3 is moved forward in the weft insertion direction by the picking rapier 3.
- Fig. 2 shows the Bringergreifer in three different times, which are represented by solid and dashed outlines.
- the weft thread 2 is held in a thread clamp of the bringer rapier and deflected at a deflection point 3a in the bringer rapier.
- the weft thread over a thread rug 7a of a in Fig. 2 Thread storage not shown, while on the other hand, as in Fig. 2 shown, is still connected to the previously entered weft.
- a cutting device 10 is provided to separate the weft thread to be entered.
- the cutting time and the time required for the separation period is critical because too early in the separation of the weft thread too little train is exerted on the same to pull it safely during recording in the thread clamp, and on the other hand in a too late separation of the weft in the cutting device is torn.
- Fig. 3 shows a schematic view of an embodiment of a cutting device 10 according to the present invention.
- the cutting device comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive which cooperates with the movable blade carrier, and which includes a pneumatic actuator 14 and a spring 15 to separate a weft inserted or inserted into a shed, wherein the spring 15 is tensioned by means of the pneumatic actuator 14 and optionally the two Cutting 12.1, 12.2 are movable apart, and wherein by means of the force of the spring, the two cutting edges are closed.
- the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
- a lever arm for example as a rotatable or rotatably mounted lever arm.
- the pneumatic actuator may be designed as a piston / cylinder unit 14 with a pressure cylinder 14a and a longitudinally movable piston 14b in the same.
- the spring 15 may be formed as a compression spring, for example as a helical compression spring, which, for example, as in Fig. 3 shown, may be arranged in the piston / cylinder unit.
- the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14, for example, to pressurize the actuator to tension the spring 15 and optionally to move the blades apart, and / or occasionally for venting the actuator 14th to trigger the cutting process.
- the control valve can be designed for example as a 3/2-way valve.
- a pressure line or a pressure source 17 may occasionally be provided in order to supply the pneumatic actuator 14 or the control valve 17 with compressed air.
- Fig. 4 shows a schematic view of a second embodiment of a cutting device 10 according to the present invention.
- the cutting device comprises a first cutting edge 12. 1 on a first, typically stationary cutting carrier 11. 1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and which includes a pneumatic actuator 14 and a spring 15 to separate a wedge thread to be inserted or inserted into a shed, wherein the spring 15 by means of pneumatic actuator 14 can be tensioned and optionally the two cutting edges 12.1, 12.2 are moved apart, and wherein by means of the force of the spring, the two cutting edges are closed.
- the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
- the pneumatic actuator be designed as a pneumatic rotary drive 14 '.
- the spring 15 may be formed, for example, as a compression spring, for example as a helical compression spring. But it is also possible, for example, to form the spring 15 as a torsion spring and to integrate occasionally in the pneumatic rotary drive.
- the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14.
- a control valve 16 for controlling the pneumatic actuator 14.
- Fig. 5 shows an oblique view of a third embodiment of a cutting device 10 according to the present invention.
- the cutting device comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and a pneumatic actuator 14 and a spring 15 contains, to separate a weft thread 2 to be entered or registered in a shed, wherein the spring 15 can be tensioned by means of the pneumatic actuator 14 and optionally the two cutting edges 12.1, 12.2 are moved apart, and wherein the two cutting edges can be closed by means of the force of the spring ,
- the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm.
- a lever arm for example as a rotatable or rotatably mounted lever arm.
- the pneumatic actuator be designed as a piston / cylinder unit 14.
- the spring 15 may be formed as a compression spring, for example as a helical compression spring, which, for example, as in Fig. 5 shown, can be arranged coaxially with the piston / cylinder unit.
- the movement of the piston in the piston-cylinder unit 14 may, for example, as in Fig. 5 are transmitted by means of a piston rod 14c on a cranked lever 14d, which in turn can be connected to the movable blade carrier 11.2.
- a thread ripper 7a shown is not part of the cutting device 10.
- the cutting device 10 comprises a control valve 16 for controlling the pneumatic actuator 14.
- a control valve 16 for controlling the pneumatic actuator 14.
- the cutting device 10 may additionally comprise a sensor 13 for detecting the cutting time and, if necessary, a control and control unit 18, which may be occasionally connected to the sensor and the control valve 16 to possible deviations from to correct a given cutting time.
- Possible deviations between the detected and predetermined cutting time are mainly due to the cutting device, for example, the switching time of the control valve or the venting of the pneumatic actuator may change or by the friction conditions in the pneumatic actuator or between the blades change, for example in the time a machine stop or as a result of temperature changes or wear.
- the described Control of the cutting time has the advantage that it can be precisely adhered to, even if the time interval between initiation of the cutting process and cutting time, ie the time by the weft is separated, is subject to change in practical operation.
- a cutting device 10 which comprises a first cutting edge 12.1 on a first, typically fixed blade carrier 11.1, a second cutting edge 12.2 on a movable and guided blade carrier 11.2 and a drive, which cooperates with the movable blade carrier, and a pneumatic Actuator 14, 14 'and a spring 15 contains, and the weft thread 2 separated by means of the cutting device 10.
- the spring 15 is / are tensioned by means of the pneumatic actuator 14, 14 ', the two cutting edges 12.1, 12.2 are opened and, to separate the weft thread, the two cutting edges are closed by means of the force action of the spring.
- the pneumatic actuator 14, 14 ' is controlled by means of a control valve 16.
- the spring 15 is tensioned and optionally the cutters are moved apart by applying pressure to the pneumatic actuator, and / or the cutting process is triggered by the pneumatic actuator being vented.
- the cutting time is / are detected with a sensor 13 and possible deviations between the detected cutting time and a predetermined cutting time are corrected.
- the inventive cutting device and the inventive method for separating a weft thread in a loom thanks to the spring drive of the closing movement, it is possible to separate the weft thread within a few milliseconds so that it can be cut cleanly, even if the cutting device is used on a high-speed rapier weaving machine.
- the described control for the cutting time allows to comply with the same more accurately, even if the time interval between the initiation of the cutting operation and the time when the weft thread is separated changes in practical operation.
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Abstract
Description
Die Erfindung betrifft eine Schneidvorrichtung für eine Webmaschine gemäss Oberbegriff von Anspruch 1 und ein Verfahren zum Betrieb derselben gemäss Oberbegriff von Anspruch 8 sowie eine Webmaschine mit einer derartigen Schneidvorrichtung und zur Ausführung eines derartigen Verfahrens.The invention relates to a cutting device for a loom according to the preamble of claim 1 and a method for operating the same according to the preamble of claim 8 and a weaving machine with such a cutting device and for carrying out such a method.
Die verschiedenen Webmaschinentypen, wie Luftdüsenwebmaschine, Greiferwebmaschine oder Projektilwebmaschine, werden auf Grund der Art des Schusseintrags benannt. In Greiferwebmaschinen wird der Schussfaden zum Beispiel mittels eines an einer Stange oder einem flexiblen Band befestigten Bringergreifers in ein Webfach eingetragen und an einer Übergabestelle im mittleren Teil des Webfaches von einem Nehmergreifer übernommen und weiterbefördert. Der Bringergreifer hat die Aufgabe den mittels eines Fadenvorlegers vorgelegten Schussfaden sicher zu fassen, denselben ins Webfach einzutragen und präzise dem Nehmergreifer zuzuführen. Der vorgelegte Schussfaden muss dabei vom vorher eingetragenen Schussfaden abgetrennt werden, bevor er ins Webfach eingetragen werden kann.The various weaving machine types, such as air jet loom, rapier weaving machine or projectile weaving machine, are named based on the type of weft insertion. In rapier weaving the weft thread is registered for example by means of a fixed to a rod or a flexible belt rapier in a shed and taken over at a transfer point in the middle part of the shed of a gripper and carried on. The Bringergreifer has the task to take the presented by means of a thread roving weft safe to enter the same in the shed and precisely feed the gripper rapier. The submitted weft thread must be separated from the previously entered weft before it can be entered into the shed.
Aus dem Dokument
In modernen Greiferwebmaschinen werden die Bringergreifer beim Schusseintrag mit hoher Geschwindigkeit bewegt. Im Schnittzeitpunkt hat der Bringergreifer eine Geschwindigkeit von typisch 20 m/s, d.h. er legt in 1 ms einen Weg von 2 cm zurück. Dementsprechend muss die Schneidvorrichtung in der Lage sein, den Schussfaden innerhalb einer Zeitspanne von wenigen ms abzutrennen, da dieser sonst nicht sauber geschnitten sondern abgerissen wird.In modern rapier weaving machines, the rapier grippers are moved at high speed during weft insertion. At the time of cutting, the rapier has a speed of typically 20 m / s, i. he travels a distance of 2 cm in 1 ms. Accordingly, the cutting device must be able to separate the weft within a period of a few ms, since this is not cut clean but torn off.
Herkömmliche Schneidvorrichtungen, wie beispielsweise die aus
Aufgabe der Erfindung ist es, eine Schneidvorrichtung für eine Webmaschine, insbesondere eine Greiferwebmaschine, und ein Verfahren zum Abtrennen eines in ein Webfach einer Webmaschine, insbesondere einer Greiferwebmaschine, einzutragenden Schussfadens zur Verfügung zu stellen, die in der Lage sind, den Schussfaden innerhalb einer Zeitspanne von wenigen ms sauber abzutrennen. Eine weitere Aufgabe der Erfindung besteht darin, eine Webmaschine mit einer derartigen Schneidvorrichtung und zur Ausführung eines derartigen Verfahrens zur Verfügung zu stellen.The object of the invention is to provide a cutting device for a weaving machine, in particular a rapier weaving machine, and a method for separating a weft thread to be introduced into a shed of a weaving machine, in particular a rapier weaving machine, which are capable of the weft thread within a period of time cleanly separated from a few ms. Another object of the invention is to provide a weaving machine with such a cutting device and for carrying out such a method.
Diese Aufgabe wird erfindungsgemäss durch die in Anspruch 1 definierte Schneidvorrichtung und durch das in Anspruch 8 definierte Verfahren zum Abtrennen eines in ein Webfach einzutragenden Schussfadens gelöst sowie durch die in Anspruch 12 definierte Webmaschine.This object is achieved according to the invention by the cutting device defined in claim 1 and by the method defined in claim 8 for separating a weft thread to be inserted into a shed and by the weaving machine defined in claim 12.
Die erfindungsgemässe Schneidvorrichtung für eine Webmaschine, insbesondere eine Greiferwebmaschine, umfasst eine erste Schneide auf einem ersten, typischerweise feststehenden Schneidenträger, eine zweite Schneide auf einem zweiten, bewegbar geführten Schneidenträger und einen Antrieb, der mit dem zweiten Schneidenträger zusammenwirkt, und der einen pneumatischen Aktuator und eine Feder enthält, um einen in ein Webfach einzutragenden oder eingetragenen Schussfaden abzutrennen, wobei die Feder mittels des pneumatischen Aktuators spannbar ist und wahlweise die beiden Schneiden auseinander bewegbar sind, und wobei mittels der Kraftwirkung der Feder die beiden Schneiden schliessbar sind.The cutting device according to the invention for a weaving machine, in particular a rapier weaving machine, comprises a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive, which cooperates with the second cutting carrier, and a pneumatic actuator and a feather contains one in a shed to be entered or registered weft thread, wherein the spring by means of the pneumatic actuator can be tensioned and optionally the two cutting edges are moved apart, and wherein by means of the force of the spring, the two cutting edges are closed.
In einer vorteilhaften Ausführungsvariante ist der zweite, bewegbare Schneidenträger als Hebelarm ausgebildet, insbesondere als drehbarer oder drehbar gelagerter Hebelarm. In einer weiteren vorteilhaften Ausführungsvariante sind der pneumatische Aktuator als Kolben/Zylindereinheit oder pneumatischer Drehantrieb ausgebildet, und/oder die Feder als Druckfeder ausgebildet, insbesondere als spiralförmige Druckfeder, wobei die Feder beispielsweise in der Kolben/Zylindereinheit angeordnet sein kann.In an advantageous embodiment, the second, movable blade carrier is designed as a lever arm, in particular as a rotatable or rotatably mounted lever arm. In a further advantageous embodiment variant of the pneumatic actuator as a piston / cylinder unit or pneumatic rotary drive are formed, and / or the spring formed as a compression spring, in particular as a helical compression spring, wherein the spring may be arranged for example in the piston / cylinder unit.
In einer weiteren vorteilhaften Ausführungsvariante umfasst die Schneidvorrichtung ein Steuerventil zur Steuerung des pneumatischen Aktuators, beispielsweise zum Beaufschlagen des Aktuators mit Druck, um die Feder zu spannen und wahlweise die Schneiden auseinander zu bewegen, und/oder zum Entlüften des Aktuators, um den Schneidvorgang auszulösen.In a further advantageous embodiment variant, the cutting device comprises a control valve for controlling the pneumatic actuator, for example for pressurizing the actuator to tension the spring and optionally to move the blades apart, and / or for venting the actuator to trigger the cutting operation.
In einer vorteilhaften Ausführungsform umfasst die Schneidvorrichtung zusätzlich einen Messaufnehmer zur Erfassung des Schnittzeitpunktes und fallweise eine Regel- und Steuereinheit, die mit dem Messaufnehmer und dem Steuerventil verbunden sein kann, um mögliche Abweichungen von einem vorgegebenen Schnittzeitpunkt automatisch zu korrigieren.In an advantageous embodiment, the cutting device additionally comprises a sensor for detecting the cutting time and occasionally a control and control unit, which may be connected to the sensor and the control valve to automatically correct possible deviations from a predetermined cutting time.
Im erfindungsgemässen Verfahren zum Abtrennen eines in ein Webfach einer Webmaschine, insbesondere einer Greiferwebmaschine, einzutragenden oder eingetragenen Schussfadens wird eine Schneidvorrichtung vorgesehen, die eine erste Schneide auf einem ersten, typischerweise feststehenden Schneidenträger, eine zweite Schneide auf einem zweiten, bewegbar geführten Schneidenträger und einen Antrieb umfasst, der mit dem zweiten Schneidenträger zusammenwirkt, und der einen pneumatischen Aktuator und eine Feder enthält, und der Schussfaden mittels der Schneidvorrichtung abgetrennt. Zusätzlich wird/werden die Feder mittels des pneumatischen Aktuators gespannt, die beiden Schneiden geöffnet und zum Abtrennen des Schussfadens die beiden Schneiden mittels der Kraftwirkung der Feder geschlossen.In the method according to the invention for separating a weft thread to be introduced or inserted into a shed of a weaving machine, in particular a rapier weaving machine, a cutting device is provided which has a first cutting edge on a first, typically fixed cutting carrier, a second cutting edge on a second, movably guided cutting carrier and a drive includes, which cooperates with the second blade carrier, and containing a pneumatic actuator and a spring, and separated the weft thread by means of the cutting device. In addition, the spring is / are tensioned by means of the pneumatic actuator, the two blades are opened and used to separate the actuator Weft the two cutting edges closed by the force of the spring.
In einer vorteilhaften Ausführungsvariante des Verfahrens wird der pneumatische Aktuator mittels eines Steuerventils gesteuert. In einer weiteren vorteilhaften Ausführungsvariante des Verfahrens wird die Feder gespannt und es werden wahlweise die Schneiden auseinander bewegt, indem der pneumatische Aktuator mit Druck beaufschlagt wird, und/oder es wird der Schneidvorgang ausgelöst, indem der pneumatische Aktuator entlüftet wird.In an advantageous embodiment variant of the method, the pneumatic actuator is controlled by means of a control valve. In a further advantageous embodiment variant of the method, the spring is tensioned and optionally the blades are moved apart by applying pressure to the pneumatic actuator, and / or the cutting process is triggered by the pneumatic actuator being vented.
In einer vorteilhaften Ausführungsform des Verfahrens wird/werden der Schnittzeitpunkt mit einem Messaufnehmer erfasst und mögliche Abweichungen zwischen dem erfassten Schnittzeitpunkt und einem vorgegebenen Schnittzeitpunkt automatisch korrigiert.In an advantageous embodiment of the method, the cutting time is / are detected with a sensor and possible deviations between the detected cutting time and a predetermined cutting time are automatically corrected.
Weiter umfasst die Erfindung eine Webmaschine, insbesondere eine Greiferwebmaschine mit einer Schneidvorrichtung gemäss einer der oben beschriebenen Ausführungsformen und -varianten und/oder ausgerüstet zum Ausführen eines Verfahrens gemäss oben stehender Beschreibung.Furthermore, the invention comprises a weaving machine, in particular a rapier weaving machine with a cutting device according to one of the embodiments and variants described above and / or equipped for carrying out a method according to the above description.
Die erfindungsgemässe Schneidvorrichtung und das erfindungsgemässe Verfahren zum Abtrennen eines in ein Webfach einzutragenden oder eingetragenen Schussfadens haben den Vorteil, dass die Feder genügend potentielle Energie speichern kann, um den Schussfaden sicher zu trennen, dass die potentielle Energie der Feder zumindest grundsätzlich in weniger als 1 ms in Bewegungsenergie umgewandelt werden kann, und der pneumatische Aktuator und die Druckversorgung desselben so ausgelegt werden können, dass dieser die Feder vergleichsweise langsam, beispielsweise innerhalb von 30 ms, spannt. Gegenüber einem direkten Antrieb der Schliessbewegung durch den pneumatischen Aktuator, wie er im zitierten Stand der Technik beschrieben ist, ergeben sich dabei erhebliche Einsparungen.The cutting device according to the invention and the method according to the invention for separating a weft thread to be introduced or inserted into a shed have the advantage that the spring can store enough potential energy to safely separate the weft thread, that the potential energy of the spring at least in principle less than 1 ms can be converted into kinetic energy, and the pneumatic actuator and the pressure supply of the same can be designed so that this comparatively slow spring, for example, within 30 ms, tensioned. Compared to a direct drive the closing movement by the pneumatic actuator, as described in the cited prior art, this results in significant savings.
Die obige Beschreibung von Ausführungsformen und -varianten dient lediglich als Beispiel. Weitere vorteilhafte Ausführungsformen gehen aus den abhängigen Ansprüchen und der Zeichnung hervor. Darüber hinaus können im Rahmen der vorliegenden Erfindung auch einzelne Merkmale aus den beschriebenen oder gezeigten Ausführungsformen und -varianten miteinander kombiniert werden, um neue Ausführungsformen zu bilden.The above description of embodiments and variants is merely an example. Further advantageous embodiments will become apparent from the dependent claims and the drawings. In addition, you can In the context of the present invention, individual features from the described or shown embodiments and variants are combined with each other to form new embodiments.
Im Folgenden wird die Erfindung an Hand des Ausführungsbeispiels und an Hand der Zeichnung näher erläutert. Es zeigen:
- Fig. 1
- eine schematische Ansicht eines Ausführungsbeispiels einer Webmaschine, wie sie im Zusammenhang mit der vorliegenden Erfindung eingesetzt wird,
- Fig. 2
- eine Detailansicht eines Bringergreifers und einer Schneidvorrichtung aus dem Ausführungsbeispiel von
Fig. 1 vor dem Abtrennen des Schussfadens, - Fig. 3
- eine schematische Ansicht eines Ausführungsbeispiels einer Schneidvorrichtung gemäss vorliegenden Erfindung,
- Fig. 4
- eine schematische Ansicht eines zweiten Ausführungsbeispiels einer Schneidvorrichtung gemäss vorliegenden Erfindung, und
- Fig. 5
- eine Schrägansicht eines dritten Ausführungsbeispiels einer Schneidvorrichtung gemäss vorliegenden Erfindung.
- Fig. 1
- a schematic view of an embodiment of a loom, as used in the context of the present invention,
- Fig. 2
- a detailed view of a Bringergreifers and a cutting device of the embodiment of
Fig. 1 before separating the weft thread, - Fig. 3
- a schematic view of an embodiment of a cutting device according to the present invention,
- Fig. 4
- a schematic view of a second embodiment of a cutting device according to the present invention, and
- Fig. 5
- an oblique view of a third embodiment of a cutting device according to the present invention.
Zusätzlich umfasst die Webmaschine eine Schneidvorrichtung 10, um den Schussfaden 2 abzutrennen, beispielsweise, wie in
In einer vorteilhaften Ausführungsvariante ist der bewegbare Schneidenträger als Hebelarm ausgebildet, beispielsweise als drehbarer oder drehbar gelagerter Hebelarm. Selbstverständlich ist es auch möglich, an Stelle eines Hebelarms zum Beispiel einen linear geführten bewegbaren Schneidenträger vorzusehen.In an advantageous embodiment, the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm. Of course, it is also possible to provide, for example, a linear guided movable blade carrier instead of a lever arm.
In einer weiteren vorteilhaften Ausführungsvariante kann, wie in
In einer weiteren vorteilhaften Ausführungsvariante umfasst die Schneidvorrichtung 10 ein Steuerventil 16 zur Steuerung des pneumatischen Aktuators 14, beispielsweise zum Beaufschlagen des Aktuators mit Druck, um die Feder 15 zu spannen und wahlweise die Schneiden auseinander zu bewegen, und/oder fallweise zum Entlüften des Aktuators 14, um den Schneidvorgang auszulösen. Das Steuerventil kann dazu beispielsweise als 3/2-Wege-Ventil ausgebildet sein. Zudem kann fallweise eine Druckleitung oder eine Druckquelle 17 vorgesehen sein, um den pneumatischen Aktuator 14 beziehungsweise das Steuerventil 17 mit Druckluft zu versorgen.In a further advantageous embodiment, the cutting
In einer vorteilhaften Ausführungsvariante ist der bewegbare Schneidenträger als Hebelarm ausgebildet, beispielsweise als drehbarer oder drehbar gelagerter Hebelarm. In einer weiteren vorteilhaften Ausführungsvariante kann, wie in
In einer weiteren vorteilhaften Ausführungsvariante umfasst die Schneidvorrichtung 10 ein Steuerventil 16 zur Steuerung des pneumatischen Aktuators 14. Für Einzelheiten zum Steuerventil wird auf die oben stehende Beschreibung des in
In einer vorteilhaften Ausführungsvariante ist der bewegbare Schneidenträger als Hebelarm ausgebildet, beispielsweise als drehbarer oder drehbar gelagerter Hebelarm. Selbstverständlich ist es auch möglich, an Stelle eines Hebelarms zum Beispiel einen linear geführten bewegbaren Schneidenträger vorzusehen.In an advantageous embodiment, the movable blade carrier is designed as a lever arm, for example as a rotatable or rotatably mounted lever arm. Of course, it is also possible to provide, for example, a linear guided movable blade carrier instead of a lever arm.
In einer weiteren vorteilhaften Ausführungsvariante kann, wie in
In einer weiteren vorteilhaften Ausführungsvariante umfasst die Schneidvorrichtung 10 ein Steuerventil 16 zur Steuerung des pneumatischen Aktuators 14. Für Einzelheiten zum Steuerventil wird auf die oben stehende Beschreibung des in
Unabhängig vom Ausführungsbeispiel und den konkreten Ausführungsformen und -varianten kann die Schneidvorrichtung 10 zusätzlich einen Messaufnehmer 13 zur Erfassung des Schnittzeitpunktes und bei Bedarf eine Regel- und Steuereinheit 18 umfassen, die fallweise mit dem Messaufnehmer und dem Steuerventil 16 verbunden sein kann, um mögliche Abweichungen von einem vorgegebenen Schnittzeitpunkt zu korrigieren. Mögliche Abweichungen zwischen dem erfassten und vorgegeben Schnittzeitpunkt sind hauptsächlich durch die Schneidvorrichtung bedingt, indem sich beispielsweise die Schaltzeit des Steuerventils oder das Entlüften des pneumatischen Aktuators verändern kann oder indem sich die Reibungsverhältnisse im pneumatischen Aktuator oder zwischen den Schneiden ändern, zum Beispiel in der Zeit nach einem Maschinenstopp oder als Folge von Temperaturänderungen oder Abnützung. Die beschriebene Regelung des Schnittzeitpunktes hat den Vorteil, dass dieser genau eingehalten werden kann, selbst wenn der zeitliche Abstand zwischen Auslösung des Schneidvorgangs und Schnittzeitpunkt, d.h. dem Zeitpunkt, indem der Schussfaden abgetrennt wird, im praktischen Betrieb Änderungen unterliegt.Regardless of the embodiment and the specific embodiments and variants, the cutting
Ein Ausführungsbeispiel des erfindungsgemässen Verfahrens zum Abtrennen eines in ein Webfach einer Webmaschine, insbesondere einer Greiferwebmaschine, einzutragenden oder eingetragenen Schussfadens 2 wird im Folgenden an Hand der
In einer vorteilhaften Ausführungsvariante des Verfahrens wird der pneumatische Aktuator 14, 14' mittels eines Steuerventils 16 gesteuert. In einer weiteren vorteilhaften Ausführungsvariante des Verfahrens wird die Feder 15 gespannt und es werden wahlweise die Schneiden auseinander bewegt, indem der pneumatische Aktuator mit Druck beaufschlagt wird, und/oder es wird der Schneidvorgang ausgelöst, indem der pneumatische Aktuator entlüftet wird.In an advantageous embodiment variant of the method, the
In einer vorteilhaften Ausführungsform des Verfahrens wird/werden der Schnittzeitpunkt mit einem Messaufnehmer 13 erfasst und mögliche Abweichungen zwischen dem erfassten Schnittzeitpunkt und einem vorgegebenen Schnittzeitpunkt korrigiert.In an advantageous embodiment of the method, the cutting time is / are detected with a
Die erfindungsgemässe Schneidvorrichtung und das erfindungsgemässe Verfahren zum Abtrennen eines Schussfadens in einer Webmaschine erlauben dank des Federantriebs der Schliessbewegung, den Schussfaden innerhalb weniger ms abzutrennen, so dass dieser sauber geschnitten werden kann, selbst wenn die Schneidvorrichtung auf einer schnell laufenden Greiferwebmaschine eingesetzt wird. Darüber hinaus ermöglicht die beschriebene Regelung für den Schnittzeitpunkt, denselben genauer einzuhalten, selbst wenn sich der zeitliche Abstand zwischen Auslösung des Schneidvorgangs und dem Zeitpunkt, indem der Schussfaden abgetrennt wird, im praktischen Betrieb ändert.The inventive cutting device and the inventive method for separating a weft thread in a loom thanks to the spring drive of the closing movement, it is possible to separate the weft thread within a few milliseconds so that it can be cut cleanly, even if the cutting device is used on a high-speed rapier weaving machine. In addition, the described control for the cutting time allows to comply with the same more accurately, even if the time interval between the initiation of the cutting operation and the time when the weft thread is separated changes in practical operation.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP08161824A EP2034061B1 (en) | 2007-09-10 | 2008-08-05 | Cutting device for a loom and method for operating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP07116005 | 2007-09-10 | ||
EP08161824A EP2034061B1 (en) | 2007-09-10 | 2008-08-05 | Cutting device for a loom and method for operating the same |
Publications (2)
Publication Number | Publication Date |
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EP2034061A1 true EP2034061A1 (en) | 2009-03-11 |
EP2034061B1 EP2034061B1 (en) | 2010-09-01 |
Family
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Family Applications (1)
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EP08161824A Not-in-force EP2034061B1 (en) | 2007-09-10 | 2008-08-05 | Cutting device for a loom and method for operating the same |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090065089A1 (en) |
EP (1) | EP2034061B1 (en) |
JP (1) | JP2009068157A (en) |
CN (1) | CN101387038A (en) |
DE (1) | DE502008001238D1 (en) |
Cited By (2)
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CN104593936A (en) * | 2015-03-02 | 2015-05-06 | 林允杜 | Impact type high-speed weft cutting device |
CN105177824A (en) * | 2015-09-17 | 2015-12-23 | 江苏华佳丝绸有限公司 | Scissor device used for solving problem of large weft tension on rapier loom |
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BE1019379A3 (en) * | 2010-06-21 | 2012-06-05 | Wiele Michel Van De Nv | DEVICE AND METHOD FOR CUTTING THE POOL YARN TO BE WOVEN IN AN AXMINSTER WEAVING MACHINE. |
BE1019807A3 (en) * | 2011-07-12 | 2012-12-04 | Picanol | DEVICE AND METHOD FOR CLOSING AN IMPOSITION WIRE |
CN108754795A (en) * | 2018-09-12 | 2018-11-06 | 太平洋纺织机械(常熟)有限公司 | Pair of weft heating scissors for a rapier loom device |
TWI732251B (en) | 2018-09-27 | 2021-07-01 | 義大利商桑德森力瑪集團有限公司 | Weft thread cutting device for shuttleless looms |
CN109457375B (en) * | 2018-11-19 | 2020-06-16 | 南京玻璃纤维研究设计院有限公司 | 2.5D prefabricated part weft shearing mechanism |
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Also Published As
Publication number | Publication date |
---|---|
US20090065089A1 (en) | 2009-03-12 |
JP2009068157A (en) | 2009-04-02 |
DE502008001238D1 (en) | 2010-10-14 |
EP2034061B1 (en) | 2010-09-01 |
CN101387038A (en) | 2009-03-18 |
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