EP1048766A2 - Process for inserting weft in a linear shed multiphase loom - Google Patents

Abstract

To insert weft yarns into the successive sheds of a rolling shed loom, formed by a loom rotor (4), a weft (10a-10d) is inser into the passage (2a-2d), at the rotor, by a fixed feed. The weft for insertion is cut (25) at the leading end to form a new wef insertion point. The weft is retracted (32) from the rotor until the weft point (33b) is in the feed or near the feed outlet opening, and is then inserted into a new passage of the rotating rotor. The retracted weft section is temporarily stored in the feed, as a yarn loop (32b). The weft is retracted by a fluid flow and/or a mechanical action on the weft. The weft is passed continuously into the feed unit and, if required, is stored temporarily, to held by a controlled fluid flow and/or a direct mechanical action on the yarn. The weft insertion into a passage at the rotor is synchronized. When the entry opening of the rotor passage at the rotor is aligned with the weft point, the weft is inserted.

Description

The invention relates to a method for inserting a weft thread into a series shed weaving machine according to the preamble of claim 1. Die The invention further relates to a series shed loom operated with this Procedure.

EP 0 433 216 B1 describes a method for entering a Weft thread in a row shed loom known, in which the Weft thread is cut after insertion, creating a new one Weft thread tip arises, and in which the weft thread is comprehensive this weft tip opposite to the direction of rotation of the weaving rotor moved and with the formation of a loop another Weft insertion path is fed.

The disadvantage of this known weft insertion method is the fact that the weft thread is sometimes so obstructed during the insertion will result in an incorrect weft insertion.

It is an object of the present invention to provide a method for registration propose a weft in a row shed weaving machine, which is more beneficial and less prone to failure.

According to the invention, this object is achieved by a method having the features of claim 1. Subclaims 2 to 7 relate to further advantageous process steps.

• indem ein Schussfaden über eine feststehende Zuführvorrichtung in eine der Schusseintragsstrecken des rotierenden Webrotors eingetragen wird,
• indem der eingetragene Schussfaden schusseintragsseitig geschnitten wird und dadurch am Schussfaden eine neue Schussfadenspitze erzeugt wird,
• indem der Schussfaden mittels der Zuführvorrichtung aus dem Webrotor zurückgezogen wird bis sich die Schussfadenspitze in der Zuführvorrichtung beziehungsweise im Austrittsbereich derselben befindet,
• und indem der Schussfaden daraufhin in eine weitere Schusseintragsstrecke des rotierenden Webrotors eingetragen wird.

The object is achieved in particular with a method for inserting a weft thread into a weaving rotor of a row shed weaving machine having a plurality of weft insertion paths,

• by inserting a weft thread into one of the weft insertion sections of the rotating weaving rotor via a fixed feed device,
• by cutting the inserted weft thread on the weft insertion side and thereby creating a new weft thread tip on the weft thread,
• by pulling the weft thread out of the weaving rotor by means of the feed device until the weft thread tip is in the feed device or in the exit area thereof,
• and by then inserting the weft thread into a further weft insertion section of the rotating weaving rotor.

The cut weft will encompass the new weft tip initially fully retracted into the feeder respectively withdrawn in such a way that the weft thread tip is in the area of the Exit opening of the feeder is located after the weft starting from the feed device into the weft insertion section of the To blow in the web rotor.

The method according to the invention has the advantage that the No weft thread during conveying in the area of the weft thread tip Loop forms more. This has the advantage that the weft can be inserted into the weft insertion path very precisely and free of interference is. The weft is actively withdrawn from the feed device. The weft thread is advantageously withdrawn in such a way that it a straight orientation remains. This ensures that the Do not form a loop in the weft thread area can. Such an entry procedure is advantageous, for example, if the Weft threads consist of a relatively stiff or very fine yarn.

Advantageously, between a thread supplying Thread feed device and the feed device a thread store arranged, which a portion of the retracted weft save allowed. The weft thread is advantageously stored in the thread store saved forming a thread loop.

In a further advantageous method, the weft thread becomes continuous fed by the thread feeder of the feeder, the Weft thread store during the retreat of the cut one Weft is controlled in such a way that both the withdrawn Thread section as well as the thread section supplied in this time period is stored in the thread memory.

Fig. 1

ein aus der zitierten Druckschrift bekannter Stand der Technik;

Fig. 2

eine schematische Darstellung eines Schussfadeneintrages in den Webrotor einer Reihenfachwebmaschine;

Fig. 3

schematisch einen Längsschnitt durch einen Webrotor sowie eine davor angeordnete Rückzugsvorrichtung;

Fig. 4a

einen Längsschnitt durch einen weiteren Webrotor entlang der Schnittlinie A-A;

Fig. 4b

eine perspektivische Ansicht des Webrotors gemäss Fig. 4a;

Fig. 5

eine Zuführ- und Rückzugsvorrichtung für den Schussfaden;

Fig. 6

einen Längsschnitt durch eine Fluiddüse;

Fig. 7

eine weitere Rückzugsvorrichtung für den Schussfaden.

The invention is explained using several examples. Show it:

Fig. 1

a prior art known from the cited document;

Fig. 2

is a schematic representation of a weft thread entry in the weaving rotor of a row shed loom;

Fig. 3

schematically shows a longitudinal section through a weaving rotor and a retraction device arranged in front;

Fig. 4a

a longitudinal section through a further weaving rotor along the section line AA;

Fig. 4b

a perspective view of the weaving rotor according to FIG. 4a;

Fig. 5

a weft feed and retraction device;

Fig. 6

a longitudinal section through a fluid nozzle;

Fig. 7

another weft retractor.

The known row shed weaving machine shown schematically in FIG. 1 comprises a weaving rotor 4 with a plurality of weft channels 7, wherein the weaving rotor 4 is rotatably mounted in the direction of rotation 5. From one Thread feed device 31 is a weft thread 10 over a Feed device comprising a feed nozzle 22 and an auxiliary nozzle 26 fed. The transfer of the weft thread 10 from the feed device to the weaving rotor takes place via a two-part device, which is a fixed one Part 21 and a rotating part 11 firmly connected to the weaving rotor 4 includes. The two parts 11, 21 are via a separating and sealing surface 20 designed to abut one another, a feed channel 24 being formed, which via a guide element 16, a fixed edge 27, a takeover channel 14, and a shooting tube 12 opens into the firing channel 7. In addition, one Blow-off nozzle 17 arranged to position the weft 10 inside to influence this channel. The weft thread 10 was in the weft channel 7a completely entered, cut on the weft entry side and is now included Help the nozzle 17 within the feed channel 24 to form a Retracted loop from the shooting tube 12a and the Shot tube 12b supplied. The weaving rotor moves as well rotating part 11 in the direction of rotation 5, whereas the weft thread 10 opposite to this direction of rotation 5 is conveyed in the feed channel 24. This promotion of the weft caused under loop formation for example a ball formation, resulting in a faulty one Weft thread entry results.

Fig. 2 shows schematically the entry of a weft 10a in the Weft insertion path 2 of the weaving rotor 4 rotating in the direction of rotation 5 Weft thread 10a is fed through the feed device 18 in the insertion direction 3a supplied and by means of the feed tube 18a designed as a fluid nozzle of the fluid supplied via the channels 18e, 18f into the Shot insertion section 2 shot. The weft 10a preferably synchronized in this way with respect to the position of the weaving rotor 4 fed that the weft thread 10a then into the weft insertion section 2 shot when the delivery nozzle 13a of the weaving rotor 4 is approximately in a aligned position to the flight direction determined by the feed pipe 18a located. The weft thread 10a is thus over the feed tube 18a straight flight path entered in the delivery nozzle 13a. The Web rotor 4 has already changed by one in the position shown in FIG Section moved in the direction of rotation 5, and the weft 10a through the feed pipe 18a and the delivery nozzle 13a into the Weft insertion path 2 is entered, the weft thread tip 33b is in the position shown in the firing channel 7. The one between the Feed pipe 18a and the conveying nozzle 13a located section of the Weft thread 10a runs essentially in the direction of rotation 5. In illustrated embodiment, the weft thread 10a over a Shot entry rotation angle 5a of 120 degrees completely into the Weft insertion distance 2 entered. Fig. 2 shows the position of the dot-dash line completely inserted weft thread 10a, which with a thread scissors 25 is cut, a new weft thread tip 33b being formed. The between the feed tube 18a and the weft tip 33b located weft thread section is fed by the feed device 18 withdrawn, preferably so far that the weft thread tip 33b is located within the feed pipe 18a. The weft tip 33b could are also located in the region of the outlet opening 23a, in particular also a little outside or just before the outlet opening 23a.

The method for inserting a weft thread 10a, 10b, 10c, 10d in a weaving rotor 4 rotating about an axis of rotation D. Row shed weaving machine is further illustrated in the diagram 3 explained. The weaving rotor 4 has a plurality of essentially extending in the direction D1 of the axis of rotation D. Weft insertion paths 2, wherein the weft thread 10a has a Feed device 18a of the weft insertion section 2 is fed. Each Weft insertion section 2 comprises an inlet opening 2a, 2b, 2c, 2d and a shot channel 7a, 7b, 7c, 7d. The weft 10a is in one of the Feed device 18a subsequent transition section 35 essentially shot in the direction D1 to the front side 4a of the weaving rotor 4 and the entry so timed with the location of the weft insertion distance 2; 2a, 7a matched that this at the beginning of the insertion of the weft 10a when the weft thread tip 33b is approximately in the position shown is arranged essentially in alignment with the weft thread 10a, around the weft 10a securely from the feeder 18a in To promote weft insertion direction 33c and in the inlet opening 2a Shoot in shot insertion path 2. While entering the Weft thread 2a in weft channel 7a turns weaving rotor 4 in Direction of rotation 5, so that part of the weft 10a along the Thread guide channel 34a extends. After the complete entry of the As shown in FIG. 3, this becomes weft thread 10a on the weft insertion side cut with thread scissors 25. In the process example shown is then the weft 10a fed using a Retraction device 32 around the thread section shown in broken lines retracted until the weft tip 33b is approximately in the illustrated Location. The retraction device 32 comprises a nozzle 28a, which the weft thread 10a held between the eyelets 29a under formation a thread loop 32b moves in the direction 32a. An advantage of this Withdrawal can be seen in the fact that the weft thread 10a is constantly in one stretched position that the weft thread tip 33b using a Sensor, not shown, can be positioned precisely, and that the Weft thread 10a without a hindrance in the weft channel 7a is shootable. Thanks to the storage function of the retraction device 32 the weft 10a can be continuously fed from the thread feeder of the Retraction device 32 are supplied. The further weft threads 10b, 10c, 10d become identical to the weft thread 10a via not shown Guide elements 18b, 18c, 18d are fed to the firing channels 7b, 7c, 7d.

4a shows a longitudinal section through a further embodiment of a Web rotor 4, which has an additional guide element 2g on its end face has, which is firmly connected to the weaving rotor 4. The guide element 2g has the function of the thread sections which are between the outlet opening 23a, 23b, 23c, 23d and the entry opening 2a, 2b, 2c, 2d, to lead each other without contact. In the exemplary embodiment according to FIG. 4a has the guide element 2g grooves 19a, 19b, 19c, 19d, in which shown section, the groove 19d has an inlet opening 2d, which for Inlet opening 13e of the delivery nozzle 13d opens out.

As shown in the perspective view according to FIG. 4b, the Grooves 19a, 19b, 19c, 19d ring-shaped in the guide element 2g, with each groove 19a, 19b, 19c, 19d at least one inlet opening 2a, 2b, 2c, 2d arranged through which the weft thread 10a, 10b, 10c, 10d the weft channel 7a, 7b, 7c, 7d can be fed. The grooves 19a, 19b, 19c, 19d prevent one mutual contact of the weft threads 10a, 10b, 10c, 10d. From the Section along the line A-A can be seen in Fig. 4a that the Outlet opening 23d of the guide element 18d opposite the inlet opening 2d located so that the weft thread 10d can be inserted into the weft channel 7d. The guide element 18d extends in the direction D1 and essentially arranged in alignment with the weft channel 7d, the weft thread 10d executes a slight transverse movement within the guide element 2g. The Row shed loom is with thread storage devices 32 or retraction devices 32, each one Air nozzle 28a, 28b, 28c, 28d and eyelets 29a, 29b, 29c, 29d include. The Thread storage devices 32 allow that of the Thread feed device 31 continuously fed thread 10a, 10b, 10c, 10d for a short time, for example in such a way that the thread 10a, 10b, 10c, 10d after the thread storage device 32 briefly motionless rests. The thread storage device 32 can also be operated in such a way that the weft after cutting with scissors 25, as for the Weft thread 10a shown opposite to the direction of entry in Withdrawn towards 3a until the tip of the weft thread for example in the guide element 18a. A can be in the guide element 18a Not shown sensor may be arranged, which the position of the tip supervised. The guide elements 18a shown have air inlet openings on which compressed air can be blown in to the weft insertion or to assist the retraction of the weft thread tip.

Fig. 5 shows a feed device 18, which of an upstream Thread feeder 31 continuously wefts 10a in Direction of conveyance 3a is supplied. The weft thread 10a opens into one Thread store 32 and passes through the fluid nozzle 18h and the feed tube 18a in the weft insertion channel 2 of the weaving rotor 4. In the illustrated Method step, the weft thread 10a was completely in the weft channel 7, 7a entered and with the formation of a new weft tip 33b cut. Then the fluid nozzle 18h is reversed such that the weft thread 10a located in the weft insertion path 2 in Retraction direction 33e is withdrawn continuously, at least as long as until the weft tip 33b has entered the feed tube 18a. Here the storage nozzle 28a is activated, in which it is a fluid, preferably Air flows out to the withdrawn from the fluid nozzle 18h emerging weft thread 10a to form a thread loop 32b save at short notice. In addition, the thread feed device 31 constantly fed weft in the conveying direction 3a, which on the feed part 18g, which comprises a feed nozzle 22, also in the thread loop 32b is saved at short notice.

Fig. 6 shows a section through the fluid nozzle 18h, which two mutually aligned fluid nozzles 41, 44 with outlet openings 43 having connected to one another via a common channel 42 are. The common channel 42 opens into the two outlet openings 45, 46. Depending on the requirements, the fluid nozzles 41, 44 can be controlled such that the weft thread 10a located in the fluid nozzle 18h to the left or right or in the direction of entry 3a or in the direction of withdrawal 33e is funded.

7 shows a mechanically designed retraction device 32 acts on the between the feed nozzle 22 and the feed pipe 18a located weft section a lever 36a, which on a Bearing 36b is mounted, and its position via a drive 36c is controllable. If the lever 36a is moved downward, it forms the Weft thread 10a has a loop 32b. He will lever up 36a is moved, the weft thread 10a is moved over a in the feed tube 18a arranged fluid nozzle withdrawn and the stored in the loop 32b Weft section pulled off until the weft 10a between the Feed nozzle 22 and the feed pipe 18a, the dash-dotted line, stretched position. It can prove to be advantageous in the feed pipe 18a to arrange a controllable thread clamp 37 which determines the position of the Weft thread 10a can be temporarily fixed by clamping.

Claims (8)

Method for inserting a weft thread into a plurality weaving rotor having weft insertion sections Row shed weaving machine, characterized in that a Weft over a fixed feed device in one of the Weft insertion distances of the rotating weaving rotor is entered, that the registered weft thread is cut on the weft insertion side and thus a new weft tip on the weft is generated that the weft thread by means of the feed device the weaving rotor is pulled back until the weft thread tip is in the feed device or in the area of the outlet opening Feeder is located, and that the weft is then in a entered further weft insertion distance of the rotating weaving rotor becomes. A method according to claim 1, characterized in that the withdrawn section of the weft thread in the short term Feeder is stored. A method according to claim 2, characterized in that the Weft thread is stored with formation of a thread loop. Method according to one of the preceding claims, characterized characterized that the weft by fluid flow and / or a means acting mechanically on the weft thread is withdrawn. Method according to one of claims 2 to 4, characterized in that that the weft is continuously fed to the feeder and that the continuously fed weft thread, if required, also temporarily stored in the feeder becomes. Method according to one of the preceding claims, characterized characterized in that the weft thread tip by means of a Weft acting fluid flow and / or a direct device acting mechanically on the weft thread in the Feed device is controllably held releasably. A method according to claim 6, characterized in that the Inserting the weft thread into a weft insertion section of the rotating web rotor is synchronized in such a way that if the entry opening of the weft insertion section is approximately flush with the Weft thread tip is arranged, the weft thread is entered. Row shed weaving machine operated with a method according to a of the preceding claims.

Images