EP1806443A1 - Feeding gripper for a shuttleless weaving loom - Google Patents

Abstract

The feeding gripper (1) has a thread clamp (4) for clamping a weft thread, and an auxiliary guiding and/or holding device (10) for guiding and/or holding the weft thread by a feeding and/or guiding element (5) and has a mass (6). The guiding and/ or holding elements are guided and/or moved by the inertia force of the mass by the acceleration or deceleration of the feeding gripper. An independent claim is also included for a method for guiding and holding a weft thread in feeding gripper.

Description

The invention relates to a rapier for a rapier with a thread clamp for clamping at least one weft thread, and a method for guiding and holding a weft thread in a Bringergreifer according to the preamble of claim 8 and a loom with such Bringergreifer and for carrying out such a method.

In rapier weaving the weft thread is registered 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 by a gripper rapier and forwarded. The bringer rapier has the task to capture the presented weft thread, enter it into the shed and deliver it precisely to the gripper. Such a rapier, which contains a thread guide formed therein and a thread clamp, is for example in the publication EP 0 441 099 A1 disclosed.

In modern rapier weaving machines, the rapier grippers are moved at high speed during weft insertion. From this high speed, the Bregergreifer must be braked so that the weft thread can be taken over at the transfer point by the gripper rapier. Due to the inertia of the weft thread, it may happen that the weft thread continues to move at the transfer point, so that the piece of thread to be taken over by the gripper gripper leaves its intended position and the gripper rapier does not leave the weft thread can take. To reduce such weft defects, a controlled yarn brake can be provided on the entry side in the area of the yarn feeding devices, which brakes the leading weft yarn. However, the risk that the piece of thread to be taken leaves its intended position in the rapier, especially in heavier weft threads even if a thread brake slows down the weft, since the inertial forces that occur during slowing down the weft thread, stretch it elastically after the yarn brake.

The object of the invention is to provide a rapier for a rapier loom and a method for guiding and holding a weft thread in a Bringergreifer available, which prevent a pre-run of the weft thread at the transfer point, and which make it possible to guide the weft such that he can be safely taken over by a gripper grab.

This object is achieved by the invention defined in claim 1 Bringergreifer and defined in claim 8 method for guiding and holding a weft thread in a Bringergreifer and by the defined in claim 10 loom.

The inventive rapier for a rapier loom comprises a thread clamp for clamping at least one weft thread. In addition, the bringer rapier comprises a guiding and / or holding device for guiding and / or holding the weft thread with a guiding and / or holding element and a mass, wherein the guiding and / or holding element by means of inertial forces, which in accelerating or decelerating the Bregergreifers act on the mass, taxable and / or movable. In a preferred embodiment, the guiding and / or holding element and / or the mass are arranged movably on the rapier.

In a preferred embodiment, the thread clamp and the guiding and / or holding element are arranged at a distance from one another, so that the weft thread can be guided and / or held on both sides of the gripper rapier during the transfer to a gripper rapier. In a In a preferred embodiment, the rapier comprises two side walls, wherein the thread clamp is arranged in the vicinity of the one side wall and the guiding and / or holding element in the vicinity of the second side wall.

In a further preferred embodiment, the guide and / or holding element is resiliently mounted or mounted or connected to a spring element and the mass arranged on the guide and / or holding element, and in an additional preferred embodiment, the guiding and / or holding element designed as a movably mounted pawl, wherein the mass may be part of the pawl, so that it is movable by the inertia of their own mass.

In a preferred embodiment, the guiding and / or holding element is designed and arranged such that the weft thread can be held by the same in a notch formed in the rapier, in particular in an upper part of the rapier.

Further, the invention comprises a method for guiding and holding a weft thread in a Bringergreifer in which the weft thread is received by the Bringergreifer and clamped by a thread clamp in the same, wherein the weft thread in the Bringergreifer additionally guided by means of a guiding and / or holding device and / or held, which is controlled and / or moved by the inertia of a mass.

In a preferred embodiment of the method, the guide and / or holding device is closed by the inertia of the mass before reaching the transfer point, so that the weft thread extends upon reaching the transfer point between thread clamp and guiding and / or holding device, and extending between thread clamp and guiding and / or holding device extending weft thread taken over by a gripper rapier.

Furthermore, the invention comprises a rapier loom with a Bringergreifer according to one of the embodiments described above and / or equipped for carrying out a method according to the above description.

The inventive rapier and the inventive method for guiding and holding a weft thread in a Bringergreifer have the advantage that thanks to the additional, controllable by inertial forces guiding and / or holding device in the yarn transfer from Bringergreifer on the gripper rapier high reliability can be achieved. This is particularly important for fast weft insertion, for example, at 350 rounds / min or 500 rounds / min. and higher. If a pre-run of the weft thread occurs, this happens outside the thread transfer area, so that the pre-run hardly occurs disturbing in the yarn transfer. Thanks to the additional guiding and / or holding device, the weft thread at the yarn transfer must be braked at most minimally, so that most weft threads can be entered without controlled thread brake. It is particularly advantageous that the weft thread can be fixed more firmly in the slave clamp, as is ensured by the holder of the weft thread on both sides of the slave clamp, the necessary thread tension on both sides. Another advantage is that the risk is low that the weft thread is overstretched when hanging on the gripper rapier, since the ground voltage can be kept low.

The above description of embodiments is merely an example. Further advantageous embodiments will become apparent from the dependent claims and the drawings. In addition, in the context of the present invention, individual features of the described or shown embodiments and variants can be combined with each other to form new embodiments.

Fig. 1

eine Schrägansicht eines Ausführungsbeispiels eines Bringergreifers gemäss vorliegender Erfindung zusammen mit einem Nehmergreifer,

Fig. 2A

eine vergrösserte Schrägansicht desselben Ausführungsbeispiels mit eingelegtem Schussfaden und geöffneter Führungs- und/oder Haltevorrichtung,

Fig. 2B

eine Schrägansicht des in Fig. 2A gezeigten Ausführungsbeispiels mit geschlossener Führungs- und/oder Haltevorrichtung,

Fig. 3A

eine Schrägansicht eines zweiten Ausführungsbeispiels mit eingelegtem Schussfaden und geöffneter Führungs- und/oder Haltevorrichtung, und

Fig. 3B

eine Schrägansicht des in Fig. 3A gezeigten Ausführungsbeispiels mit geschlossener Führungs- und/oder Haltevorrichtung.

In the following the invention will be explained in more detail with reference to the embodiment and with reference to the drawing. Show it:

Fig. 1

1 is an oblique view of an embodiment of a Bringergreifers according to the present invention together with a gripper rapier,

Fig. 2A

an enlarged oblique view of the same embodiment with inserted weft and opened guide and / or holding device,

Fig. 2B

2 is an oblique view of the embodiment shown in FIG. 2A with the guide and / or holding device closed;

Fig. 3A

an oblique view of a second embodiment with inserted weft and opened guide and / or holding device, and

Fig. 3B

an oblique view of the embodiment shown in Fig. 3A with closed guide and / or holding device.

Fig. 1 shows an embodiment of a Bringergreifers according to the present invention together with a slave gripper 2 in an oblique view. The weft insertion direction is marked in FIG. 1 with an arrow 12. In the exemplary embodiment shown, the gripper rapier 1 comprises a thread clamp 4 for clamping at least one weft thread and additionally a guiding and / or holding device 10 for guiding and / or holding the weft thread with a guiding and / or holding element 5 and a mass 6, wherein the guide - And / or holding element 5 by means of inertial forces, which act on an acceleration or deceleration of the rapier 1 on the mass 6, taxable and / or is movable. In an advantageous embodiment, the guiding and / or holding element 5 and / or the mass 6 are arranged movably on the rapier. The design and mode of operation of the guiding and / or holding device 10 will be discussed in more detail in connection with the description of FIGS. 2A, 2B and 3A, 3B.

In a further advantageous embodiment, the bringer rapier 1, comprise further parts, for example, as shown in Fig. 1, two Side walls 1a, 1b and, if necessary, a top 9. The top can, as shown, be provided with a notch 8, in which the weft thread can be inserted to guide this during the entry. Further, the guide and / or holding member 5 may be secured to the upper part 9, for example by means of a fastening element 7, which may be designed, for example, as a screw.

In a preferred embodiment, the thread clamp 4 and the guiding and / or holding element 5 are spaced apart from each other, so that the weft thread is guided or held on the transfer of the gripper rapier 2 on both sides of the gripper rapier. If the rapier 1 comprises two side walls 1a, 1b, the thread clamp can be arranged for example in the vicinity of the one side wall and the guiding and / or holding element in the vicinity of the second side wall.

Fig. 2A shows an enlarged oblique view of the same embodiment with inserted weft and opened guide and / or holding device. In the exemplary embodiment, the rapier 1 comprises a thread clamp 4 and additionally a guiding and / or holding device 10, which is arranged at a distance from the thread clamp. The guide and / or holding device 10 includes in this embodiment, a guide and / or holding element 5, which is resilient, for example in an advantageous embodiment as a bending spring, which is attached at one end to the rapier, for example with a fastener 7 at one Upper part 9 of the rapier. The other end of the guide and / or holding element 5 and the bending spring is free and in the position shown in Fig. 2A as far as the thread clamp 4 out deflected that the weft thread 3 slide past the guide and / or holding member 5 and, for example, in a notch 8 can be inserted in the upper part 9. Further, the guiding and / or holding device 10 includes a mass 6. This may for example consist of the mass of the spring element 5, or if this is too light, from an additional mass which is arranged on the spring element. A particular advantage of this embodiment is that the free end of the guiding and / or holding element 5 can be moved without friction.

The Bregergreifer shown in Fig. 2B differs from that shown in Fig. 2A only by the position of the guide and / or holding member 5. The free end of the formed as a bending spring guide and / or holding member 5 is in Fig. 2B in the direction deflected to a laterally arranged in the rapier 1 notch 8 out so that the free end closes the notch, for example, by the guide and / or holding member 5 touches one side of the notch or protrudes beyond the one side. An inserted into the notch weft thread 3 is thus included, even if the running outside of the bringer rapier piece of thread, as indicated in Fig. 2B by a forward loop, precedes the Bringergreifer. The guide and / or holding element 5 thus forms together with the notch 8 a guide eye. Optionally, the guide and / or holding element 5 z. B. also be formed as part of a thread clamp. On the notch 8 or guide eye opposite side of the rapier of the weft thread 3 is held by the thread clamp 4, so that the weft thread is held on both sides of the Bringergreifers. Thanks to the arranged on the guiding and / or holding element 5 mass 6, the free end thereof can be deflected sideways by the inertial forces occurring during acceleration and deceleration of the rapier and open the notch 8 and guide eyelet and / or closed.

Fig. 3A shows an oblique view of a second embodiment with inserted weft and opened guide and / or holding device. In the illustrated embodiment, the Bringergreifer 1 comprises a thread clamp 4 and in addition a guide and / or holding device 10, which is arranged at a distance from the thread clamp. The guide and / or holding device 10 includes in this embodiment, a movably mounted pawl 5, which is for example mounted pivotably about a bearing element 5a. Further, a stop 5b may be provided to limit the rotational movement when opening the pawl. The pawl shown comprises a closing part, which in the position shown in FIG. 3A is pivoted so far toward the thread clamp 4 that the weft thread 3 slides past the closing part and, for example, into a notch 8 in an upper part 9 of the rapier 1 can be inserted. In an advantageous embodiment, the pawl 5 has its own mass, which is sufficient to overcome the bearing friction, so that the pawl during acceleration and deceleration of the rapier is movable by the force acting on the mass inertial forces. If necessary, the pawl may additionally be connected to a spring element, for example to keep the pawl 5 open during slow movements of the rapier.

The Bregergreifer shown in Fig. 3B differs from that shown in Fig. 3A only by the position of the pawl 5. The pawl shown comprises a closing part, which is pivoted in Fig. 2B towards a laterally arranged in the rapier 1 notch 8 out in that the closing part closes the notch, for example by touching one side of the notch or protruding beyond the one side. An inserted into the notch weft thread 3 is thus included, even if the running outside the bringer thread piece of thread over the bringer rapier precedes. The closing part of the pawl 5 forms together with the notch 8 a guide eye. On the notch 8 or guide eye opposite side of the rapier of the weft thread 3 is held by the thread clamp 4, so that the weft thread is held on both sides of the Bringergreifers. Thanks to the own mass of the pawl 5, this can be pivoted by the inertial forces occurring during acceleration and deceleration of the rapier and open the notch 8 or guide eyelet and / or closed.

An embodiment of the inventive method for guiding and holding a weft thread in a Bringergreifer will be described below with reference to Figures 2A and 2B. In the method, the weft thread 3 is received by the bringer rapier 1 and clamped by means of a thread clamp 4 in the same. For this purpose, the presented weft thread can be taken, for example, at the beginning of the weft insertion by the Bringergreifer, wherein the weft thread is pulled by the forward movement of the Bringergreifers in the thread clamp and clamped in this. When receiving the weft thread by the bringer rapier, the same, if desired, also in a spaced from the thread clamp 4 arranged guide are inserted in the rapier, for example, as shown in Fig. 2A, in a notch 8. In the process, the weft thread 3 is additionally guided and / or held in Bringergreifer 1 by means of a guiding and / or holding device 10, which is controlled and / or moved by the inertia of a mass 6.

In an advantageous embodiment of the method, the Bringergreifer 1 is delayed before reaching the transfer point, wherein the guiding and / or holding device 10 is closed by the force acting on the mass 6 inertial forces, so that the weft thread 3 upon reaching the transfer point, as shown in FIG 2B, between thread clamp 4 and guide and / or holding device 10 extends. The weft thread extending between the thread clamp and the guiding and / or holding device is now taken over by a gripper rapier. Conveniently, the guiding and / or holding device 10 is designed so that the weft thread can be pulled out with the guide and / or holding device closed. In this way it can be ensured that when taking over the weft thread on both sides of the slave clamp a thread tension is present.

It is advantageous that the inertia-controlled guiding and / or holding device is inevitably open when picking up the weft thread at the beginning of the weft insertion because of the positive acceleration present in this phase. Only with very slow gripper movements, it may be expedient to ensure the opening of the guiding and / or holding device by additional measures, for example by a spring element.

Thanks to the additional, controllable by inertial forces guiding and / or holding device, a high reliability can be achieved in the yarn transfer from the rapier on the gripper rapier, especially in fast weft entries. If a pre-run of the weft thread occurs, this happens outside of the thread clamp between the thread clamp and guide and / or holding device extending piece of thread, so that the pre-emergence hardly occurs in the thread transfer in appearance. In addition, the risk is low that the weft during Hanging on the gripper rapier is overstretched, since the ground voltage can be kept low. It is also advantageous that the weft thread at the thread transfer must be braked at most minimally, so that most weft threads can be entered without controlled thread brake, and that the weft thread can be better fixed in the slave clamp, since the weft thread in the acquisition on both sides of the Clamp is held and thus on both sides a tensile stress is present.

Claims (10)

Bringer gripper for a rapier with a thread clamp (4) for clamping at least one weft thread (3), characterized in that the Bringergreifer (1) additionally a guide and / or holding device (10) for guiding and / or holding the weft with a guide - And / or holding element (5) and a mass (6), and that the guiding and / or holding element (5) by means of inertial forces acting on an acceleration or deceleration of the rapier on the mass (6), and tax / or is movable. Bringergreifer according to claim 1 wherein the guiding and / or holding element (5) and / or the mass (6) are arranged movably on the bringer rapier (1). A rapier according to claim 1 or 2, wherein the thread clamp (4) and the guide and / or holding element (5) are arranged at a distance to guide the weft thread (3) in the transfer to a gripper rapier (2) on both sides of the gripper rapier and / or keep. A rapier according to claim 2 or 3, wherein the rapier (1) comprises two side walls (1a, 1b), and wherein the thread clamp (4) is arranged in the vicinity of the one side wall and the guiding and / or holding element (5) in the Near the second side wall. Bringergreifer according to one of claims 1 to 4, wherein the guide and / or holding element (5) is resiliently formed or fixed or connected to a spring element, and wherein the mass (6) on the guide and / or holding element (5) is arranged , Bringer gripper according to one of claims 1 to 5, wherein the guiding and / or holding element is designed as a movably mounted pawl (5) which is movable by means of the inertia of its own mass. Bringergreifer according to one of claims 1 to 6 wherein the guiding and / or holding element (5) is designed and arranged such that the weft thread (3) through the same in a Bringergreifer (1), in particular in an upper part (9) of the Bringergreifers , trained notch (8) is held. Method for guiding and holding a weft thread in a bringer rapier, in which method the weft thread (3) is received by the bringer rapier (1) and clamped therein by means of a thread clamp (4), characterized in that the weft thread in the bringer rapper is additionally guided by means of a guide - And / or holding device (10) is guided and / or held, which is controlled and / or moved by means of the inertia of a mass (6). Method according to claim 8, wherein before the transfer point is reached, the guiding and / or holding device (10) is closed by the inertia of the mass (6), the weft thread (3) reaching the transfer point between thread clamp (4) and guiding and / or holding device (10), and wherein a gripper rapier (2) takes over the weft thread extending between the thread clamp and the guiding and / or holding device. Rapier weaving machine with a rapier according to one of claims 1 to 7 and / or equipped for carrying out a method according to one of claims 8 or 9.

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