DE1535531A1 - Method and device for inserting the weft in ribbon looms with needle-shaped weft insertion elements - Google Patents

Description

Jakob Müller Fr ick (Aargau, Switzerland)

PROCEDURE UIiD DEVICE FOR CARRYING THE EGG IN BAlTD WEB MACHINES KIT NADEIPO-PERMITTED 8-SHOT ENTRIES.

Ribbon looms are known in which the weft thread is entered into the shed by means of a needle, the

the weft entered in this way is grasped and crocheted by a tying element, e.g. a latch needle. It doesn't matter whether the stitch formation takes place with the aid of the weft thread itself or by using an auxiliary thread. Both hitherto known machines of this type generally made both the weft insertion member and the latch needle reciprocating Movements that are each in one plane. The weft thread is grasped by the latch needle in the following way:

When the weft insertion member has reached its end position after the weft has been inserted into the shed, the latch needle becomes guided forward so that it engages behind the weft thread. If now the LSchusseintragorgan is withdrawn, so the weft thread gets stuck on the latch needle and, when this is then also withdrawn, the loop is formed. This Movement requires the utmost precision, both waa the mutual Location of the two organs mentioned as well as their movement, because if the setting is insufficiently precise, either the Latch needle is unable to grasp the weft thread or latch needle and weft insertion element collide and beuchädlgt

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the. Achieving this precision is particularly fast running machines, all the more difficult since vibrations are inevitable, which must be taken into account.

It has therefore already been proposed that the weft insertion member to lead in one plane, but to perform a combined circular and oscillating movement in this plane allow. The security achieved in this way of grasping the weft thread by the latch needle, however, was only minimal larger than with the looms described above and had to go through a much more complicated control system of the weft insertion element to be bought.

Attempts have therefore also been made to create a weft insertion member which carries out a normal reciprocating movement assign a swinging or elliptical movement making latch needle. However, this arrangement is also not advantageous, because of the restless movement of the latch needle large and therefore loose stitches are created.

The present invention aims at a method which ensures that the inserted weft thread is reliably grasped by the tying element, for example a latch needle, even without oversized Precision of the setting made possible with relatively simple means. This method of entering the shot in ribbon looms with needle-shaped weft insertion organs and binding organs is characterized in that the inserted weft thread is in readiness through the weft insertion element in each case tss division brought binding organ is inserted. The device to use this process, with a weft insertion and

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a binding member, is characterized in that a control is provided that the binding organ or the binding organs in. A reciprocating, rectilinear or curved movement drives and the weft insertion member a reciprocating Movement, combined with a rocking movement for inserting the weft thread into the tying element.

An embodiment of the device according to the invention is shown schematically in the drawing in three phases of movement.

Pig. 1 shows the position after the last weft insertion with the shed closed and with the reed attached.

Fig. 2 shows the position with the reed swung out and open compartment during the reciprocating movement of the weft insertion element and the tying element.

Fig. 3 shows the final phase of the weft insertion, in which the weft insertion member has just carried out its rocking movement Has.

In these figures, 1 is the band that goes behind the web " sheet 2 divides into the as yet unwoven chain parts 3 and 4. In the division shown in Fig. 1, this is the binding organ representing latch needle 5 is completely withdrawn so that it lies outside the range of motion of the reed 2, which has just struck the weft thread 6 at the stop line 7. The weft thread 6 forms the latch needle 5 around the hook 8 a loop 9 and runs between the two fork-shaped ends 10 of the weft insertion element 11, which instead of the fork could also have an eyelet.

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In Pig. 2, the reed 2 has moved to its outermost position to the right and also that through the chain parts 5 and 4 formed compartment open. This is the way for that Weft insertion member 11 has become free, which executes a straight or slightly curved movement towards the viewer and thereby the weft thread 6 enters the shed. At the same time, the latch needle 5 has moved to the right, so that the loop 9 of the weft thread 6 could slide along the latch needle 5, the tongue 12 being turned over so that the loop 9 P now lies beyond the tongue 12 on the shaft of the latch needle 5. This and the weft insertion element 11 is now for the insertion of the Weft thread 6 ready, which is shown in Fig. J5.

In this the reed 2, the latch needle 5 and its tongue 12 are in the same position when the shed is open like in Pig. 2 · The weft insertion member, however, has a short one Rocking movement carried out downwards, whereby the weft thread 6 is inserted into the hairs 8 of the latch needle 5. This insertion takes place in a position in which the latch needle and the weft insertion member are spatially separated from one another enough to also if these two organs are not precisely adjusted, they cannot come into contact with one another. The rocking movement of the weft insertion element 11 could also be rotated around exist its longitudinal axis.

As soon as that in Pig. 3 has been inserted, the latch needle 5 and the weft insertion member 11 are withdrawn at the same time, the latter being returned to its original upper air _; , e bounces back. By withdrawing the latch needle 5, the loop 9 throws the tongue 12 over the end

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of the hook 8 and can over this to form a stitch fall over the weft thread 6 inserted there, which in turn forms a new loop 9 again. Immediately after the latch needle 5 and the weft insertion member 11 in their starting position have returned, the reed 2 is attacked and all weaving elements are again in the Pig. I shown Starting position.

The above-described method and the device for its application, which can differ in detail from the exemplary embodiment shown without departing from the scope of the invention, achieve a number of advantages. The movement of the weft insertion member is reduced to a minimum, which protects the weft thread and enables the use of less tear-resistant material. This protection is also given by the fact that the weft thread is not guided over a thread wrapping piece and is therefore additionally stressed. The Einle- * gen of the weft thread into the Abbindeorgan done with the utmost safety, without it being necessary to carry out these two institutions a time-consuming and precise adjustment that may also not touch, so that damage is avoided. Because the latch needle only executes a back and forth movement, small stitches are achieved. The length of the bowl support member can be small, so that vibrations are avoided.

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Claims (7)

PATEKI CLAIMS 1 B 3 t C 3 1 1. Method for inserting the weft in ribbon looms with needle-shaped weft insertion organs and binding organs, characterized in that the inserted weft thread (6) through the weft insertion organ (10) is inserted into the binding element (5) which is brought into the ready position. 2. The method according to claim 1, characterized in that the insertion of the weft thread (6) into the binding element (5) by a rocking movement of the weft insertion element (10). P 3 «device for applying the method according to claim 1 or 2, with a weft insertion and a binding member, characterized in that a control is provided that the binding member or drives the binding members (5) in a reciprocating, straight or curved movement and the weft insertion member (10) perform a to-and-fro movement combined with a rocking movement to insert the weft thread into the tying element (5) leaves. 4, device according to claim 3 »characterized in that the forward movements of the binding element (5) and the weft insertion element (10) take place at least approximately simultaneously. 5, device according to claim 3 or 4, characterized in that that the binding element (5) and the weft insertion element (10) are arranged in such a way are that their trajectories do not cross in the same plane, so they cannot collide. 6, device according to one of several of claims 5 to 5, characterized in that the weft insertion member (10) is fork-shaped. 009845 / ^ 187 ORIGJNAi- [, WECTED 7. Device according to one or more of claims 3 "to 6, characterized in that the AVbinding element (5) is a latch needle. 009845 / Π187 Blank page