EP2570530B1 - Warp stop motion detector and circular loom - Google Patents

Description

The invention relates to a Kettbändchenwächter for weaving machines, in particular looms, with a sensor piece having a passage for a warp, wherein the sensor piece between a rest position, in which it is biased, and a working position, in which it by a tensile stress of the passage passing through Kettbändchens is movable back and forth, and with a rest position detector which detects the presence of the sensor piece in the rest position or the approach of the sensor piece to the rest position and emits a rest position signal when detected rest position of the sensor piece or its approach to the rest position.

The invention further relates to a circular loom, to which a plurality of warp tapes can be fed to a Rundriet, with a main drive and a control device, wherein the circular loom is equipped with Kettbändchenwächtern.

Round looms have been known for a long time. They generally have a Rundriet, which is fed by a "gate" called frame or a so-called "warp beam" a variety of warp. This Kettbändchen is issued in Rundriet by arranged around a central axis Kettbändchenhubmittel, which are mostly designed as a flock of about upper and lower rollers back and forth Ösenbänder, in pairs an opposite up and down alternating motion, which is formed between droves of warp a shed in which one or more weft ribbon spools circulate on wefts about the central axis and thereby insert a weft ribbon between two Kettbändchenscharen, whereby a tubular fabric is formed, which is withdrawn from the loom and further processed or rolled into bales.

Round looms of this type are for example from the document EP 0 786 026 B1 known.

The gates, each with a plurality (typically hundreds) of warp coils, or the warp beams, each consisting of a rotatable axle and a plurality of warp windings independently wound on that axle, typically flank the loom of two or more sides. The warp tapes of each reel are fed individually to the round reed of the circular loom. Each time a warp or warp winding is exhausted, ie If the warp tape on it has reached its end, the empty warp spool concerned must be replaced by a full spool (or the entire warp beam) and the new warp tape (s) must be threaded into the circular weaving machine. This threading process can be made much easier, if not yet the end of the previous Kettbändchens was pulled into the loom. Then you can simply knot the end of the previous Kettbändchens with the beginning of the new Kettbändchens, so that threading the new Kettbändchens is unnecessary in the circular loom. However, one must be able to detect the exhaustion of a warp coil in time, which is not easy with sometimes hundreds of warp spools.

For this purpose, in the past, warp tape guards have been developed that can detect the exhaustion of a warp coil and give a warning signal. Such a Kettbändchenwächter is eg from the document DE 562975 known.

However, it has been found that merely displaying the end of a warp tape can often not prevent damage to the loop loom because the unavoidable loss of tension that occurs when the end of a warp string passes from the reel causes the warp to move undefined in the warp Circular loom around, can form loops that get tangled with other Kettbändchen or wrap around moving parts of the loom and prevent them from proper movement. The consequence of such undefined in the circular loom "flying around" Kettbändchenenden can be fatal and lead to the widespread destruction of the circular loom. Apart from that, the Kettbändchenende is accelerated as a rubber band before by the sudden weakening tension when a warp spool exhaustion, whereby it usually gets into a position in which it is not tangible for the attachment of the replacement Kettbändchens.

It is the object of the present invention to provide a solution to the described problems of the prior art.

The present invention solves this problem in a first aspect by further development of an initially quoted Kettbändchenswächters by a Kettbändchenklemmeinrichtung is provided, between which and the sensor piece, the Kettbändchen is clamped when the sensor piece moves to its rest position. By this measure, not only reliably reaches the end and thus leakage of a warp tape from his spool, but also held an end of the warp tape before he can be fed into the loom. It is thus safely prevented the leaked warp in the circular loom can cause damage. Furthermore, the Kettbändchenende is at a well-defined position for attaching the replacement Kettbändchens available.

The bias of the sensor piece in its rest position can be effected for example by gravity and / or spring force.

The present invention achieves the stated object in a second aspect by providing a circular loom, to which a plurality of warp tapes can be fed to a round reed, which has a main drive and a control device, wherein the circular weaving machine is equipped with warp tape monitors according to the invention, their rest position signals can be fed to the control device are, wherein the control device shuts off the main drive when a quiescent signal occurs. By shutting off the main drive, it is possible to use a new Kettbändchenspule and to link the beginning of the new Kettbändchens with the end of the detected spilled Kettbändchens while this is clamped by the invention Kettbändchenwächter.

Further advantages and features of embodiments of the invention Kettbändchenwächters be explained below.

In a further development of the Kettbändchenwächters the passage for the Kettbändchen in the sensor piece is formed transversely to the direction of its reciprocating motion between the rest position and the working position. Thus, a short and consequently low-friction path of the warp strip is created through the sensor piece. Furthermore, the occurrence of deflection forces on the sensor piece is prevented obliquely to the direction of displacement. Finally, in this embodiment, changes in the tension of the warp tape and its associated more or less severe sagging to considerable displacements of the sensor piece, which are of course easier to detect than minor displacements.

Advantageously, the passage for the warp strip in the sensor piece is formed as a laterally open groove, whereby a great deal of time is saved when hooking the Kettbändchens when commissioning the circular loom.

To ensure defined clamping forces between the clamping device and the sensor piece, it is advantageous if the sensor piece is mounted rotationally fixed.

High clamping forces on the warp tape can be achieved if, in the warp stopper according to the invention, the clamping device is provided with a clamping surface designed as a friction surface, wherein preferably the friction surface is provided by a friction lining, such as e.g. a gumming, or surface roughening, or the formation of serrations is realized.

In order to ensure that the warp tape between the clamping device and the sensor piece is firmly clamped, is provided in a variant of the invention, the clamping surface and / or a clamping surface facing the surface of the sensor piece in convex training form facing each other.

As a further measure for generating high clamping action, it can be provided that the clamping device at least partially surrounds the sensor piece in a plane transverse to the reciprocating direction of the sensor piece. By this measure, a secure clamping effect can be achieved even with varying ribbon position.

In a preferred embodiment of the invention Kettbändchenwächters is provided that the sensor piece has a head and a shaft, wherein in the head of the passage for the Kettbändchen is formed and the Kettbändchen between the head and the clamping device can be clamped when the sensor piece approaches its rest position. Such a sensor piece is cheap and accurate to produce, with the clamping forces occurring between the sensor piece and the clamping device are well-defined.

In a preferred embodiment of the invention, the shaft is guided axially displaceable. The axial mobility of the shaft defines the reciprocating direction of the sensor piece between the rest position and the working position as a translational movement. This translatory movement is easily detectable by the detector, which is why it is preferred in this embodiment that the detector detects the approach of the sensor piece to its rest position on the basis of the position of the shaft.

In order for a warp-ribbon guard to be adaptable to different tape weights and tape stiffnesses, in a preferred embodiment of the invention it is provided that weights variable to the head can be fastened, preferably weights between 10 g and 100 g, or the stock is interchangeable and shanks with different weights, preferably weights between 10 g and 100 g, are provided. The attachment of the weights or Austauschschäfte the head can be done for example by means of plugging, screwing, or gluing.

A high clamping effect between sensor piece and clamping device is achieved when the head has a tapering in the direction of the rest position, preferably having a taper angle (α) between 5 ° and 120 °, more preferably between 5 ° and 60 °. In other words, in this embodiment, the head is formed as a "wedge", whereby the warp tape is "wedged". The smaller the taper angle, the higher the naturally achievable clamping force; a lower limit of the taper angle is achieved when the sensor piece develops a tendency to become stuck on the clamp. An upper limit of the taper angle is achieved when the clamping forces achieved become too small.

Preferably, the head is formed of a ceramic material because it is durable and low in wear.

As a material for the shaft, metal, preferably steel, is preferred because it is easy to machine and suitable for a variety of detectors.

In order to ensure a stable guidance for the moving Kettbändchen, Kettbändchenführungen can be provided, which - seen in the reciprocating direction of the sensor piece - are arranged laterally from the sensor piece, wherein the sensor piece between the Kettbändchenführungen is movable therethrough.

Furthermore, it is proposed to use detectors based on optical, electrical or magnetic principles in the warp tape monitors according to the invention. Such detectors may e.g. as a light barrier, as a switch in that the sensor piece short-circuits or disconnects switching contacts, or be designed as inductive or capacitive devices by an inductance or capacitance is influenced by displacement of the sensor piece.

During operation of the circular loom, fluctuations in the warp tension occur again and again, which have nothing to do with the exhaustion of a warp coil, but are operationally caused, for example, by an edge turn of a warp coil falls down on the coil axis and thereby causes a short-term, transient Zugspannungsabfall which, however, corrects itself if that Kettbändchen was retracted by the length of the fallen turn in the loom. In order to prevent in such cases a misinterpretation of a tension loss of the warp tape as reaching the Kettbändchenendes, it is provided according to the invention that the detector emits the rest position signal only after he has detected the presence of the sensor piece in the rest position during a predetermined period of time. By doing so, transient warp ribbon variations that cause displacement of the sensor piece in or near the home position are not misinterpreted as leaking out of a warp coil. This proposed measure can also be implemented by software (eg in the controller).

In order to minimize the cabling effort, it may be provided in the case of the warp-ribbon monitor according to the invention that a single detector detects the rest position of a multiplicity of sensor pieces.

• Fig. 1 zeigt eine erste Ausführungsform eines erfindungsgemäßen Kettbändchenwächters in Seitenansicht.
• Fig. 2 zeigt ein Detail der ersten Ausführungsform des erfindungsgemäßen Kettbändchenwächters in Seitenansicht.
• Fig. 3 zeigt ein weiteres Detail der ersten Ausführungsform des erfindungsgemäßen Kettbändchenwächters in Vorderansicht.
• Fig. 4 zeigt die erste Ausführungsform des erfindungsgemäßen Kettbändchenwächters in der Perspektive.
• Fig. 5 zeigt eine alternative Ausführungsform eines Sensorstücks des Kettbändchenwächters.
• Fig. 6 zeigt wiederum eine andere Ausführungsform eines Sensorstücks des Kettbändchenwächters.
• Fig. 7 zeigt das Sensorstück von Fig. 6 mit einer anderen Klemmeinrichtung.
• Fig. 8 zeigt eine Rundwebmaschine mit dem erfindungsgemäßen Kettbändchenwächter in schematischer Seitenansicht.
• Fig. 9 zeigt eine Detailansicht der Rundwebmaschine von Fig. 8.
• Fig. 10 zeigt eine Detailansicht der Rundwebmaschine von Fig. 8, bei der erfindungsgemäße Kettbändchenwächter an anderen Stellen platziert sind.

The invention will now be explained in more detail by means of embodiments with reference to the drawings.

• Fig. 1 shows a first embodiment of a Kettbändchenwächters invention in side view.
• Fig. 2 shows a detail of the first embodiment of the invention Kettbändchenwächters in side view.
• Fig. 3 shows a further detail of the first embodiment of the invention Kettbändchenwächters in front view.
• Fig. 4 shows the first embodiment of the invention Kettbändchenwächters in perspective.
• Fig. 5 shows an alternative embodiment of a sensor piece of Kettbändchenwächters.
• Fig. 6 again shows another embodiment of a sensor piece of Kettbändchenwächters.
• Fig. 7 shows the sensor piece of Fig. 6 with another clamping device.
• Fig. 8 shows a circular loom with the invention Kettbändchenwächter in a schematic side view.
• Fig. 9 shows a detailed view of the circular loom of Fig. 8 ,
• Fig. 10 shows a detailed view of the circular loom of Fig. 8 , are placed in the invention Kettbändchenwächter in other places.

In the FIGS. 1 . 2 . 3 and 4 a first embodiment of a Kettbändchenwächters 1 according to the invention for weaving machines, in particular for looms is shown. First, reference is made to Fig. 1 showing in side view two adjacent Kettbändchenwächter 1, and Fig. 4 , which shows in perspective a plurality of in two rows side by side and one behind the other arranged Kettbändchenwächtern 1. Each Kettbändchenwächter 1 comprises a sensor piece 2, which has a passage 3a for a Kettbändchen K1, K2. The sensor piece 2 is between a rest position R, in which it is biased by gravity, alternatively by spring tension, and a working position A, in which it is displaced by a tensile stress F of passing through the passage Kettbändchens K1, K2, back and forth , The sensor piece 2 is mounted rotationally fixed in a guide 7.

In Fig. 1 is the sensor piece 2 of the right Kettbändchenwächters 1 in the rest position R. The dashed Kettbändchen K1 comes from the top right of a Kettbändchenspulengatter or warp beam, not shown, is deflected at an upper roller 10 and a lower roller 11, then passes through the passage 3a the sensor piece 2 passes, continues to a first rod-shaped Kettbändchenführung 12, where it is deflected again, then continues on a second rod-shaped Kettbändchenführung 13, and finally via a guide roller 14 in a circular loom, not shown. It should be noted that the sensor piece 2 is therefore in the rest position R because the warp strip K1 has already reached the end of its warp coil, not shown, and thus is no longer under tension.

In Fig. 1 is the sensor piece 2 of the left Kettbändchenwächters 1 in the working position A. The drawn in a solid Kettbändchen K2 comes from the bottom right of the not shown Kettbändchenspergengatter or warp beam, is deflected at the lower roller 11, then passes through the first Kettbändchenführung 12 through the Passage 3a of the sensor piece 2 through, then continues on the second Kettbändchenführung 13 and finally on the guide roller 14 in the circular loom, not shown. It should be noted that the sensor piece 2 is therefore in the working position A because the warp tape K2 is under tensile stress F, caused on the one hand by its insertion into the circular loom and on the other hand by the opposing force of Kettbändchenspule on which the Kettbändchen K2 is wound becomes.

The upper and lower rollers 10, 11 and the first and second Kettbändchenführung 12, 13 are - seen in the direction of movement T of the sensor piece 2 - laterally arranged from the sensor piece 2, wherein the sensor piece 2 between the Kettbändchenführungen 10, 11, 12, 13 is movable therethrough.

Each Kettbändchenwächter 1 further comprises a rest-position detector 5, which detects the presence of the sensor piece 2 in the rest position R or the approach of the sensor piece 2 to this rest position R and emits a rest position signal 6 at detected rest position R of the sensor piece 2 or its approach to the rest position R. In Fig. 1 the right sensor piece 2 is in the rest position R, so that the right-hand rest-position detector 5 outputs the rest-position signal 6.

An essential feature of the invention Kettbändchenwächters 1 is - formed in this embodiment by two rods - Kettbändchenklemmeinrichtung 15, 16 for the right Kettbändchenwächter or Kettbändchenklemmeinrichtung 16, 17 for the left Kettbändchenwächter. The Kettbändchen K1 is clamped between the Kettbändchenklemmeinrichtung 15, 16 and located in the rest position sensor piece 2 of the right Kettbändchenwächters 1.

Now it will open Fig. 2 Reference is made, which shows the left Kettbändchenwächter 1 in an enlarged view in a solid line in the rest position R and in dotted line in working position A. The sensor piece 2 comprises a head 3 and a shaft 4, wherein in the head 3 of the passage 3a for the warp K2 is formed. The Kettbändchen K2 is clamped between the head 3 of the sensor piece 2 and the clamping device 16, 17 when the sensor piece 2 approaches its rest position by the head 3 moves into the clamping device 16, 17 formed by the two rods, wherein the two rods are arranged at a distance parallel to each other, which is smaller than the width of the head 3, so that the head 3 gets stuck between the rods. To increase the friction, the rods of the clamping device 16, 17 are each provided with a clamping surface designed as a friction surface 16a, 17a, for example, the friction surface of the clamping device 16 by a friction lining such as a rubber coating, and the friction surface of the other clamping device 17 by a surface roughening, or the formation of serrations is realized. The rods have a circular cross-section, so that the clamping surfaces 16a, 17a are convexly facing the surface of the head 3 of the sensor piece 2. This results in a very good clamping effect.

The shaft 4 has a rectangular cross-section and is in rectangular recesses 7a (see also Fig. 4 ) of the guide 7 rotationally fixed, but along its longitudinal axis L between the working position A and the rest position R back and forth (Double arrow T) led. It can be seen that the passage 3a for the warp strip K2 in the sensor piece 2 is formed transversely to the direction T of its reciprocating movement between the rest position R and the working position A. From the front view of Fig. 3 , to which reference is now also made, it can be clearly seen that the passage 3a for the warp strip K2 is formed in the head 3 of the sensor piece 2 as a laterally open (3c) groove. This allows a time-saving hooking the Kettbändchens when commissioning the loom. In this embodiment, the detector 5 detects the approach of the sensor piece 2 to its rest position R based on the position of the shaft 4. The detector 5 can be based on optical, electrical or magnetic principle and, for example, as a light barrier, or switch by the shaft 4 of the sensor piece. 2 Switching contacts in the detector 5 shorts or disconnects, or be designed as an inductive or capacitive detector 5, wherein the displacement of the shaft 4 of the sensor piece 2 affects an inductance or capacitance which is detected.

At the head 3, a variable weight 3b is fixed, which preferably weighs between 10 g and 100 g, wherein the attachment of the weight 3b on the head 3 can be done for example by plugging, screwing, or gluing. Furthermore, the shaft 4 can also be exchangeably connected to the head 3, and shafts with different weights, preferably between 10 g and 100 g, can be provided. The attachment of the shaft 4 to the head 3 can e.g. by plugging, screwing, or gluing done. Due to these variable weights, the sensor piece can be adapted to different ribbon weights and stiffnesses.

The head 3 has a tapering in the direction of the rest position R shape, wherein it preferably has a taper angle α between 5 ° and 120 °, more preferably between 5 ° and 60 °. The smaller the taper angle α, the higher the achievable clamping force. However, if it is chosen smaller than 5 °, there is a risk that the head 3 gets stuck in the clamping device 16, 17.

Preferably, the head 3 is formed of a ceramic material. The shaft 4 is made of metal, preferably steel.

In Fig. 4 it can be seen that, for reasons of space, a multiplicity of sensor pieces 2 are arranged in two parallel rows and offset relative to one another in the guide 7. This arrangement of the sensor pieces can be suitably used to detect the presence of a plurality of sensor pieces in the rest position by means of a single detector. For this purpose, one forms the detector as a light barrier and arranges it so that a detector detects a whole series of sensor pieces. For this purpose, the light barrier is set up so that the light path of the light barrier is not interrupted in the working position of all sensor pieces of this row; but if only one sensor piece lowers to its rest position, it enters the light path of the light barrier. In the arrangement of all sensor pieces in two parallel rows can thus be found with only two detectors Auslangen.

Fig. 5 shows one Fig. 2 similar side view of an alternative sensor piece 22, which differs from the in Fig. 2 used sensor piece only by the shape of the head 23. Namely, the head 23 is formed with concave outer surfaces 23a, 23b facing the convex clamping surfaces 16a, 17a of the clamper 16, 17. As a leg of the taper angle α, the tangents at the points of contact between the outer surfaces 23a, 23b and the clamping surfaces 16a, 17a are to be regarded. The remaining parts correspond to the embodiment of the Kettbändchenwächters 1 of Fig. 1 to Fig. 4 and are also numbered with the same reference numerals.

Fig. 6 shows one Fig. 2 similar side view of another alternative embodiment of the sensor piece 32, which differs from the in Fig. 2 used sensor piece only differs by the shape of the head 33. The head 33 is disc-shaped in its lower part, so that it has a convex outer surface 33 a, which faces the clamping device 34, 35. In this embodiment, the clamping means 34, 35 are in the form of two parallel bars of rectangular cross-section, defining plane clamping surfaces 34a, 35a which are inclined to each other. As a leg of the taper angle α, the tangents at the points of contact between the outer surface 33a and the clamping surfaces 34a, 35a are to be regarded. The remaining parts correspond to the embodiment of the Kettbändchenwächters 1 of Fig. 1 to Fig. 4 and are also numbered with the same reference numerals.

Fig. 7 shows the sensor piece 32 in cooperation with the in the Figures 1-4 shown clamping device 16, 17, which is formed by two spaced rods with a circular cross-section. In this embodiment, both the clamping surfaces of the clamping device and the surface of the sensor piece in convex formation facing each other.

Fig. 8 shows a schematic side view of a circular loom 100. A detailed view of the circular loom 100 is shown in Fig. 9 shown. Left and right of the circular loom 100 each have a gate 101 is arranged. Each gate carries one Variety of Kettbändchenspulen 102, of which the Kettbändchen K individually removable and about various deflections, such as the guide roller 14, a Rundriet 105 of the circular loom 100 can be fed. The circular loom further comprises a main drive 103 and a control device 104, the main drive 103 driving the movable elements of the circular loom 100, and the control device 104 electronically controls all the functions of the circular loom 100. The operation of such a circular loom is well known to those skilled and therefore needs no further explanation. The special feature of this circular loom 100 is the arrangement of the invention Kettbändchenwächter 1 in the path of Kettbändchen K between the Kettbändchenspulen 102 and their collection in the circular loom 100. In the representation of FIGS. 8 and 9 the Kettbändchenwächter 1 are arranged near the deflection roller 14. It is essential that the rest-position signals 6 of the warp-ribbon monitor 1 are fed to the control device 104. When the controller 104 receives a home page signal 6, it turns off the main drive 103. As a result, the circular loom 100 comes to a standstill and an operator can change the empty warp bobbin 102, from which a warp K has completely expired, thereby losing its tension, which in turn the associated sensor piece 2 has assumed its rest position and the warp stop button 1 has issued the rest position signal 6 ,

Occasionally, however, it happens that individual turns of warp K fall from their warp coil 102 onto the spool axis. Affected are, in particular, windings arranged at the edges of the warp coil 102. This dropping of individual Kettbändchenwindungen has further no negative effects, but the loose winding is successively unwound. However, dropping a warp turn results in a temporary loss of tension of the warp tape involved. In order to prevent in such cases a misinterpretation of the tension loss of the warp K as exhaustion of Kettbändchenspule 102, it is provided that the detector of Kettbändchenwächters 1, the rest of the signal signal 6 only when he has detected the presence of the sensor piece in the rest position during a predetermined period of time , This retarding measure does not take account of transient warp tension fluctuations which cause a displacement of the sensor piece into or close to the rest position. This measure can also be implemented in software in the control device 104 by being programmed so that it only reacts to the rest position signal 6 when it has received it for a predetermined period of time.

Fig. 10 shows a detailed view of the circular loom of Fig. 8 , in which the Kettbändchenwächter 1 according to the invention are placed directly on the gate 101.

Claims (19)

1. A warp band stop motion (1) for looms, in particular circular looms, comprising a sensor piece (2, 22 32) which has a passage (3a) for a warp band (K, K1, K2), wherein the sensor piece (2, 22, 32) can be reciprocated between a rest position (R) in which it is biased and a working position (A) into which it can be displaced by a tensile stress (F) of the warp band (K, K1, K2) running through the passage, and comprising a rest position detector (5) which detects the presence of the sensor piece (2, 22, 32) in the rest position (R) or the approach of the sensor piece (2, 22, 32) toward the rest position (R) and emits a rest position signal (6) if the rest position (R) of the sensor piece (2, 22, 32) or its approach toward the rest position has been detected, characterized by a warp band clamping device (15, 16; 16, 17; 34, 35) between which and the sensor piece (2, 22, 32) the warp band (K, K1, K2) can be clamped when the sensor piece (2, 22, 32) moves into its rest position (R).
2. A warp band stop motion according to claim 1, characterized in that the passage (3a) for the warp band (K, K1, K2) in the sensor piece (2, 22, 32) is formed transversely to the direction (T) of its reciprocating movement between the rest position (R) and the working position (A).
3. A warp band stop motion according to claim 1 or 2, characterized in that the passage (3a) for the warp band in the sensor piece (2, 22, 32) is designed as a groove which is laterally open (3c).
4. A warp band stop motion according to any of the preceding claims, characterized in that the sensor piece (2, 22, 32) is mounted so as to be resistant to torsion.
5. A warp band stop motion according to any of the preceding claims, characterized in that the warp band clamping device (15, 16; 16, 17; 34, 35) is provided with a clamping surface (16a, 17a, 34a, 35a) designed as a friction surface, wherein the friction surface is preferably implemented by a friction lining such as, e.g., a rubber coating or a roughened surface or the formation of spikes.
6. A warp band stop motion according to claim 5, characterized in that the clamping surface (16a, 17a, 34a, 35a) and/or a surface (33a) of the sensor piece (2, 32) which faces the clamping surface face each other in a convex design.
7. A warp band stop motion according to any of the preceding claims, characterized in that the clamping device surrounds the sensor piece at least in a section at a level transversely to the direction of the reciprocating movement of the sensor piece.
8. A warp band stop motion according to any of the preceding claims, characterized in that the sensor piece (2, 22, 32) comprises a head (3, 23, 33) and a shaft (4), wherein the passage (3a) for the warp band (K, K1, K2) is formed in the head (3, 23, 33) and the warp band (K, K1, K2) can be clamped between the head (3, 23, 33) and the warp band clamping device (15, 16; 16, 17; 34, 35) when the sensor piece (2, 22, 32) approaches its rest position (R).
9. A warp band stop motion according to claim 8, characterized in that the shaft (4) is guided so that it can be displaced axially (L).
10. A warp band stop motion according to claim 8 or 9, characterized in that the detector (5) detects the approach of the sensor piece (2, 22, 32) toward its rest position (R) on the basis of the position of the shaft (4).
11. A warp band stop motion according to any of claims 8 to 10, characterized in that variable weights (3b), preferably weights between 10 g and 100 g, can be fastened to the head (3), or the shaft (4) is replaceable and shafts with different weights, preferably weights between 10 g and 100 g, are provided.
12. A warp band stop motion according to any of claims 8 to 11, characterized in that the head (3, 23, 33) has a shape tapering in the direction of the rest position, wherein it preferably has a tapering angle (α) of between 5° and 120°, more preferably of between 5° and 60°.
13. A warp band stop motion according to any of claims 8 to 12, characterized in that the head (3, 23, 33) is formed of a ceramic material.
14. A warp band stop motion according to any of claims 8 to 13, characterized in that the shaft (4) is formed of metal, preferably steel.
15. A warp band stop motion according to any of the preceding claims, characterized by warp band guides (11, 12; 12, 13) which - viewed in the direction (T) of the reciprocating movement of the sensor piece (2, 22, 32) - are arranged laterally to the sensor piece (2, 22, 32), the sensor piece being movable between the warp band guides.
16. A warp band stop motion according to any of the preceding claims, characterized in that the detector (5) is based on an optical, electric or magnetic principle.
17. A warp band stop motion according to any of the preceding claims, characterized in that the detector (5) will emit the rest position signal (6) only after it has detected the presence of the sensor piece (2, 22, 32) in the rest position (R) for a predetermined time span.
18. A warp band stop motion according to any of the preceding claims, characterized in that a single detector (5) detects the rest position of a plurality of sensor pieces (2, 22, 32).
19. A circular loom (100) at which a plurality of warp bands (K) can be supplied to a circular reed (105), comprising a main drive (103) and a control device (104), characterized by warp band stop motions (1) according to any of the preceding claims the rest position signals (6) of which can be supplied to the control device (104), wherein the control device (104) switches off the main drive (103) in the occurrence of a rest position signal (6).

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