Circular loom

Abstract

The invention relates to a circular loom (1) for producing a circular woven fabric (14), comprising: a main axis (2); a reed for guiding a shuttle for weft yarns; a supply holder (3) for warp yarns (5); a drawing-in device (7) for drawing in the warp yarns (5) from the supply holder (3); an arrangement of guiding and length-compensating elements (13) comprising feedthroughs (19) for the warp yarns (5) drawn in by the drawing-in device (7); an outer stop (20) against which the guiding and length-compensating elements (13) are positioned in an outer stop position when they are in an initial state in which they are not loaded by the warp yarns (5); an inner stop (21) against which the guiding and length-compensating elements are positioned in an inner stop position; a middle stop (22) against which the guiding and length-compensating elements are positioned in an operating position, wherein the guiding and length-compensating elements (13) each comprise a spring rod (16) having a first spring rod part (17) on which the feedthrough (19) is provided, wherein the first spring rod part (17) can be deflected in the operating position by being bent up to the inner stop position at the inner stop (21), wherein the spring rods (16) each comprise a second spring rod part (18) which presses the guiding and length-compensating element (13) into the outer stop position when it is in an initial state in which it is not loaded by the warp yarns (5).

Description

[0001] The invention relates to a circular weaving machine according to the preamble of claim 1.

[0002] Such a circular weaving machine is known from DE 44 00 005 C1.

[0003] Another circular loom is known, for example, from EP 2 829 645 A1. This circular loom has warp guide elements arranged around a circular frame for feeding a multitude of warp threads. Shed-forming devices group the fed warp threads into two sets and impart opposing alternating movements to them, thereby opening and closing a shed between the two sets. A shuttle moves on a circular track within the open shed, carrying a weft thread from a spool it holds into the shed, thus forming a woven fabric. The fabric is then drawn off through a heddle. The warp guide elements are designed as length-compensating compensators, each comprising a spring bar and an eyelet at the upper end of the spring bar for guiding and redirecting a warp thread.

[0004] These length compensation elements, hereinafter also referred to as compensators, serve two main purposes: firstly, to compensate for the different lengths of the warp threads during the shed stroke, which occurs when switching between the upper and lower sheds after each shuttle pass, thus providing tension compensation; and secondly, to perform a monitoring function. The circular loom can be stopped if the compensators are triggered by a warp thread breakage, warp thread run-out at the outer stop, or warp thread overtension at the inner stop. This reduces defective fabric production and waste.

[0005] In the prior art, the compensators have a default setting for the empty state, i.e., without warp threads and consequently without warp thread tension towards the center of the circular loom. The compensators are cast into a bearing bracket. Separate tension springs are provided below the bearing bracket, connected at one end to the compensators and at the other end to another ring, the so-called tension spring ring. This design is in Fig. 3 This is illustrated in the present disclosure. With the aid of these separate tension springs, the compensators are brought into the outer resting position by a stop against an outer ring. During the weaving process, the compensators are moved by the warp tension against the tension spring force towards the center of the loom until the lower ends of the compensators abut another stop ring. In this pre-tensioned position, the compensator begins to operate. From this position onwards, only the bending spring force of the compensator acts, because the effective length of the tension spring is limited by the ring in the working position and is therefore already exhausted. From this working position, the compensator interacts with the warp feed. The compensator can therefore move continuously from the working position to the inner stop by means of bending as the tension of the warp threads increases.When the warp tension decreases, the compensator moves back towards the outer stop position, at which point the tension spring comes back into effect. The compensator positions can differ due to the uniform warp feed and the tension variations resulting from the weaving process (passage of shuttles, incorporation). Because the warp feed runs at the same speed as the fabric take-off speed, there is no way to actively and controllably influence the individual warp tension. This can often lead to warp threads that are either too loose or too tight. On the path from the stock holder to the reed, differences in angle, friction, and tension between the individual warp threads can also increase positional differences, resulting in warp threads that are either too loose or too tight.Excessively loose warp threads, through contact between the compensator and the outer stop position, cause the weaving machine to stop. This also leads to warp thread breaks, weaving defects, inadequate fabric structure, increased waste, and production downtime. Another drawback is the tension springs, which wear through at both the hook and the compensator with continued operation and can also be overstretched when re-hooking the machine. Due to poor visibility and accessibility, the tension springs are often not replaced after wear and tear, resulting in missing springs in some areas. Consequently, the affected compensator can no longer perform its emergency shutdown function in the event of warp thread breakage, warp thread run-out, or warp thread overtension at that point.This can lead to blockages that require significant effort to clear, result in long downtimes, increased waste, and consequently, poor overall efficiency of the weaving machine. If excessive warp tension occurs, caused by a disruption in the warp bobbin feed at the creel or in the feed area before the compensation mechanism, and the compensator is pulled from the warp to the inner stop position, a further arc restricts the movement, creates a contact, and stops the weaving machine.

[0006] The further general state of the art is illustrated by EP 0253799 A2 and AT 507558 A4.

[0007] In contrast, the present invention aims to alleviate or eliminate at least some disadvantages of the prior art.

[0008] This problem is solved by a circular weaving machine according to claim 1. Preferred embodiments are specified in the dependent claims.

[0009] According to the invention, the spring rods each have a second spring rod part which presses the guide and length compensation element into the outer stop position in the basic state unloaded by the chain straps.

[0010] Thus, the second spring bar sections are designed to move the first spring bar sections into the outer stop position when the guide and length compensation elements are in their unloaded state, i.e., without tension from the warp threads. Unlike the prior art, the preload of the guide and length compensation element, also known as a compensator, can be generated by the counter-tension of the spring bar itself. Advantageously, this eliminates the need for a separate tension spring, which in the prior art pushes the spring bars into the outer stop position. This avoids tension springs with the disadvantages described above. The second spring bar section is flexible enough that, in the unloaded state, the guide and length compensation element is moved into the outer stop position by the elastic restoring force resulting from the bending of the second spring bar section. The first spring bar section is also flexible.When the guide and length compensation element is positioned against the spring force of the second spring bar section in the working position at the center stop, the first spring bar section can be elastically deflected by the warp thread against the restoring force due to the bending of the first spring bar section, depending on the tensile tension, up to the inner stop position at the inner stop. The spring bar remains attached to the center stop. The first spring bar section can have an eyelet or a maillon, particularly at its upper end, to allow the passage of the respective warp thread.

[0011] For the purposes of this disclosure, terms of location and direction, such as "horizontal," "vertical," "above," and "below," refer to the intended operating state of the circular loom on a horizontal floor with the main axis vertically aligned. "Inside" means closer to the main axis, i.e., closer to the center of the circular loom. "Outside" means farther from the main axis, i.e., from the center of the circular loom.

[0012] During operation of the circular loom, the guide and length compensation element is moved by the warp tension at the guide towards the center of the loom until it rests against the center stop. In this pre-tensioned state, the guide and length compensation element is in its working position. From this point, the first spring rod section of the guide and length compensation element begins to compensate for the change in warp length caused by the shuttle change.The designated spring section of the first spring rod, extending from the working position (coming from the outer stop position) to the inner stop position, is designed to compensate for the change in warp length caused by the shed change. This ensures that the guide and length compensation element is positioned at a sufficient distance from both the outer and inner stop positions in the working position. While the guide and length compensation element oscillates around the working position, the weaving process, particularly due to variations in warp incorporation, warp density, and warp tension, can cause individual warp threads to become looser or tighter during operation.

[0013] Preferably, the circular weaving machine has a device for stopping the circular weaving machine due to a stop of one of the guide and length compensation elements in the outer stop position and / or in the inner stop position.

[0014] The design according to the invention reliably prevents the failure to detect malfunctions via the outer stop position due to insufficient chain tension, since tension springs and thus also worn-through tension spring hooks or rings are eliminated.

[0015] Furthermore, the design of the guide and length compensation elements with the second spring bar sections allows for a more compact construction compared to the prior art. The elimination of the tension springs means that the warp overflow bracket used in the prior art, located directly before the compensation, can be omitted. In a preferred embodiment, therefore, no warp overflow bracket is provided directly in front of the guide and length compensation elements. Preferably, the circular weaving machine has an eyelet arch. This eyelet arch can be positioned higher compared to the prior art. Preferably, the eyelet arch is located at a height above the lower end of the guide and length compensation element, particularly adjacent to the lower shed when the shed is fully open. This would not be possible in the prior art because the warp threads could collide with the tension springs.Another advantage of the above embodiment lies in the homogenization of the entry angles of the individual warp threads, as they are distributed over 360°.

[0016] In a preferred embodiment, the first and second spring rod parts have the same, preferably round, in particular circular, cross-section.

[0017] In a preferred embodiment, the first and second spring rod sections are designed as the first and second segments of the spring rod, respectively. In this embodiment, the first and second spring rod sections are preferably formed as a single piece. For example, the first and second spring rod sections can be formed by sections of round wire. The opening, particularly at the upper end of the first spring rod section, can also be formed by a segment of the single-piece spring rod, especially round wire.

[0018] Depending on the design, the elongated spring rods can have a length of 100 to 500 millimeters (mm). In a round wire version, the spring rod can, for example, have a diameter of 1 mm to 3 mm, particularly 2 mm.

[0019] Various designs of spring bars can be provided to pre-tension the guide and length compensation elements into the outer stop position.

[0020] In a preferred embodiment, the spring rods forming the first and second spring rod sections are each bent at least once by more than 90°, and in particular at least once by more than 135°, relative to the outer stop position. Therefore, at least one bending point is provided in this embodiment.

[0021] In a first embodiment, the spring rods forming the first and second spring rod sections are each bent exactly once by more than 135° relative to the outer stop position. Preferably, in this embodiment, the spring rods are bent into a substantially U-shape. This embodiment is advantageous for manufacturing reasons because only a single bending point is required, while simultaneously enabling a space-saving arrangement.

[0022] In a second variant, the spring rods forming the first and second spring rod sections are each bent at least twice by more than 135°, and in particular exactly three times by more than 135°, relative to the outer stop position. Preferably, the spring rods in this variant are essentially "W"-shaped. This embodiment is particularly space-saving.

[0023] In another embodiment, the second spring rod sections are arranged at an angle of less than 30° to the first spring rod sections, relative to the outer stop position. Preferably, in this variant, the spring rods are essentially "I"-shaped.

[0024] To apply the spring force, it is advantageous if the second spring rod parts, especially at their free ends, are each placed under preload against a (stationary during the weaving process) stop element, especially a stop ring.

[0025] The guide and length-compensating elements are preferably arranged in a ring-shaped configuration around the reed. The warp threads can be guided from the guide and length-compensating elements through openings in the reed. As is common in the prior art, shed-forming devices for opening and closing a shed can be provided between the guide and length-compensating elements and the reed, distributed around the reed.

[0026] For easy assembly and arrangement of the guide and length compensation elements in the intended positions around the main axis of the circular weaving machine, the spring rods are held according to the invention on bearing brackets, each of which is mounted on a bearing element (stationary during the weaving process), in particular a bearing ring.

[0027] To allow for subsequent replacement, in a preferred embodiment the spring rods are detachably arranged on the bearing brackets, preferably via plug connections. This embodiment is also advantageous from an ecological point of view.

[0028] Preferably, the spring rods are made of metal and / or the bearing brackets are made of plastic.

[0029] In a preferred embodiment, the bearing brackets are arranged between the opposite ends of the spring rods. Each spring rod can have a retaining element, in particular a retaining section of the spring rod, which extends between the first and the second spring rod section. The retaining element, in particular the retaining section, is held on the bearing bracket.

[0030] According to the invention, the bearing mounts are designed as pivot bearing mounts, which are pivoted, preferably about a horizontal pivot axis, when the guide and length compensation elements transition between the working position and the outer stop position.

[0031] To precisely define the working position, the swivel bearing brackets according to the invention each have a stop surface which, in the working position, is abutted against the center stop. The stop surface of the swivel bearing bracket can be curved, in particular according to an outer contour of the center stop. In the working position, the first spring rod sections can be deflected by elastic bending in the direction of the inner stop position to allow dynamic length compensation of the warp threads during compartment changes.

[0032] In a preferred embodiment, the spring rods are each held in a retaining groove of the pivot bearing bracket. This ensures secure retention of the spring rods on the pivot bearing brackets. Furthermore, it is advantageous that the bearing width of the guide and length compensation elements is increased. Preferably, the bearing width of the guide and length compensation element, including a desired clearance, corresponds to the circumference of the bearing ring, less any attachment points on the weaving machine, divided by the maximum number of warp threads on the weaving machine. This eliminates the need for the separators used in the prior art between the individual guide and length compensation elements.

[0033] In a preferred embodiment, the spring rods are arranged on the pivot bearing brackets such that the effective length of the first spring rod sections (i.e., the portion of each first spring rod section available for deflection) decreases from the working position to the inner stop position. This is preferably achieved by increasing the length of the spring rod's bearing surface on the pivot bearing bracket from the working position to the inner stop position. This allows for progressive spring tension under higher warp tension due to the shorter spring length of the first spring rod section.

[0034] In one variant, the support for the spring rod has at least one edge at which the effective length of the first spring rod section is shortened between reaching the working position and the inner stop position. In this variant, the effective spring length of the first spring rod section is shortened in steps.

[0035] In a second variant, the support for the spring rod has a curved contact surface, which continuously shortens the effective length of the first spring rod section towards the inner stop position.

[0036] In a preferred embodiment, the pivot bearing brackets each have a hook, preferably directed downwards, which limits the pivoting of the pivot bearing bracket outwards, i.e. away from the center of the circular weaving machine.

[0037] In another embodiment, the bearing brackets are arranged at the ends of the second spring bar sections opposite the openings for the warp threads. In this embodiment, the outer stop, the inner stop, and the center stop can be positioned between the opening at one end of the spring bar and the bearing bracket at the other end.

[0038] The invention is explained below with reference to preferred embodiments, which are illustrated in the following drawings. Fig. 1 shows a schematic side view of a circular weaving machine according to the invention, in which the compensation device for guiding and length equalizing the warp threads has individual spring bars with first spring bar parts and second spring bar parts. Fig. 2 schematically shows the circular weaving machine of the Fig. 1 Top view. Fig. 3 schematically shows guide and length compensation elements according to the state of the art. Fig. 4 schematically shows an embodiment of the guide and length compensation elements according to the invention. Fig. 5 shows another embodiment of the guide and length compensation elements. Fig. 6 bis 9 Figure 1 shows various embodiments of the guide and length compensation elements according to the invention in a basic state unloaded by the warp threads. Fig. 10 bis 13 show the Fig. 6 bis 9 corresponding views of the guide and length compensation elements in a working position.

[0039] In Fig. 1 and Fig. 2 A circular loom 1 is shown, designed for use with tapes, threads, monofilaments, and multifilaments as warp and weft tapes. The circular loom 1 has a reed (not shown for clarity), hereinafter referred to as the reed, which is arranged in a ring around a substantially vertical main axis 2, along which a shaft runs. A shuttle (not shown) with a weft tape spool is guided along the reed to deliver a weft tape. The circular loom 1 also has a stock holder 3, a so-called creel, on which warp tape spools 4 with warp tapes 5 are arranged vertically one above the other in horizontal rows. On the opposite side of the circular loom 1, mirrored with respect to the main axis 2, another stock holder (not shown) is provided, which can be of identical design.The warp threads are fed from the warp thread spools 4 via gate eyes 6 at angles 6A to a feed device 7, which has a deflecting roller 8 and a feed roller 9. The feed roller 9 is driven by a motor to control the feed of the warp threads 5.

[0040] As from Fig. 1 , 2As further shown, after the feeder 7, the warp threads 5 are fed via further deflection rollers 10, 11 and an eyelet arc 12 to an arrangement of guide and length-compensating elements 13, so-called compensators, which are described in detail below and are arranged around the main axis 2, outside the reed. Dynamic fluctuations in the warp thread tension are compensated for by means of the guide and length-compensating elements 13. Sheath-forming devices (not shown here) are arranged around the reed between the guide and length-compensating elements 13 and the reed. These devices produce two sets of warp threads (shown schematically) that perform opposing alternating movements upwards and downwards, thereby opening and closing a shed.When open, the shed forms a space defined by the two sets of warp tapes, through which the shuttle moves with the weft tape spool and releases a (not visible) weft tape to produce the circular fabric 14.

[0041] As from Fig. 3 As can be seen, the guide and length compensation elements 13 are each pre-tensioned by means of a tension spring 15 in the prior art.

[0042] Fig. 4 In contrast, Figure 1 schematically shows an embodiment of the guide and length-compensating element 13 as a spring rod 16 with a first spring rod section 17 and a second spring rod section 18. At their upper, free ends, the first spring rod sections 17 have openings 19, in particular an eyelet or a loop or a maillon, through which the warp threads 5 are guided. The guide and length-compensating elements 13 interact with an outer stop 20, an inner stop 21, and a center stop 22 (each in Fig. 4 (only shown schematically). In an outer stop position, which is in Fig. 4 In the position marked "A", the first spring rod section 17 rests against the outer stop 20. In an inner stop position, which is in Fig. 4 The first spring rod section 17, marked "C", rests against the inner stop 21. In a working position that is in Fig. 4 When labelled "B", the spring rod 17 rests against the center stop 22. In the working position with the spring rod 16 resting against the center stop, the spring rod 16 can be moved further into the inner stop position by elastic deflection of the first spring rod section 17, in which the spring rod 16 is also resting against the inner stop 21.

[0043] Regarding the state of the art, see: Fig. 3 The tension spring 15 is used to bring the guide and length compensation element 13 into the outer stop position at the outer stop 20. In contrast, in the embodiment of the Fig. 4 The second spring rod section 18 is designed to push the spring rod 16 into the outer stop position. This prevents malfunctions, for example, due to worn hooks on the tension springs 15. Furthermore, an overrun bracket 23 (see...) can be used. Fig. 3 ) can be dispensed with.

[0044] In the embodiment of the Fig. 1 and Fig. 4 The spring rod 16 is bent exactly once by more than 135°, relative to the outer stop position of the guide and length compensation element 13, to form the first 17 and the second spring rod section 18. The second spring rod section 18 is elastically pre-tensioned at one end of the spring rod 16 opposite the passage 19 and is attached to a stop element 24 (stationary during the weaving process), in particular to a stop ring extending annularly around the main axis 2 (in the Fig. 6 bis 13 The stop element 24 is symbolized with "V" for preload. Furthermore, the spring rod 16 is attached to a - in Fig. 1 and Fig. 4 The bearing support 25, which is only schematically visible, is held on a bearing element 26 (stationary during the weaving process), in particular on a bearing ring running in a ring shape around the main axis 2.

[0045] Fig. 5 Figure 1 shows a further embodiment of the guide and length compensation element 13 in the working position attached to the center stop 22, illustrating three different bending states of the first spring bar section 17 during the dynamic length compensation of the tensile stresses by the chain. In the embodiment of Fig. 5 The spring rod 16 is bent at a first bend 27, a second bend 28, and a third bend 29. The spring rod 16 is detachably held, here via a plug connection, on the bearing bracket 25, which in the illustrated embodiment is designed as a pivot bearing bracket between the opposite ends of the spring rod 16. The pivot bearing bracket has a pivot axis 31 about which the pivot bearing bracket can pivot relative to the bearing element 26. The pivot bearing bracket has a stop surface 34 which, upon reaching the working position, is struck against the center stop 22 from the outer stop position to block further inward pivoting of the pivot bearing bracket during the movement of the spring rod 16 to the inner stop position of the spring rod 16. The spring rod 16 is held in an end-face retaining groove 32 of the pivot bearing bracket.On the side of the first spring rod section 17, the retaining groove 32 transitions into a support 33, here a bearing groove, against which the first spring rod section 17 rests when deflected after reaching the working position towards the inner stop position. This allows the effective length of the first spring rod section 17 to decrease towards the inner stop position, thus achieving a progressive spring characteristic. The pivot bearing bracket also has a downward-facing hook 34. If individual spring rods 16 are missing during partial assembly, the pivot bearing bracket could tilt outwards and then downwards during operation, thus compromising separation; or the pivot bearing bracket could fall out, creating a gap. These malfunctions are prevented by the hook 34, which limits the outward pivoting.

[0046] Fig. 6 bis 9 Figure 1 shows various embodiments of the guide and length compensation elements 13, which are positioned in the outer stop position in the basic state unloaded by the warp threads 5. In the Fig. 10 bis 13 The corresponding views for the working position of the guide and length compensation elements 13, which are attached to the center stop 22, are shown.

[0047] Fig. 6 and Fig. 10 show an embodiment in which the first 17 and the second spring rod part 18 are in the basic state (cf. Fig. 6 ) are arranged in an essentially I-shape, i.e., essentially in a line. The free end of the second spring rod section 18 is pre-tensioned by means of the stop element 24.

[0048] Fig. 7 and Fig. 11 show the embodiment of the Fig. 1 and 4 , so that reference can be made to the above explanations.

[0049] Fig. 8 and Fig. 12 show, in simplified form, the embodiment of the Fig. 5 , so that reference can be made to the above explanations.

[0050] Fig. 9 and Fig. 13 show an embodiment in which the bearing holder 25 is provided at one end of the spring rod 16 opposite the passage 19. Reference number list:

[0051] 1 Circular weaving machine 2 Main shaft 3 Supply holder 4 Warp bobbins 5 Warp tapes 6 Creep eyes 6 Angle 7 Feed device 8 Deflection roller 9 Feed roller 10, 11 Additional deflection rollers 12 Eyelet arc 13 Guide and length compensation element ("compensator") 14 Circular fabric 15 Tension spring 16 Spring bar 17 First spring bar section 18 Second spring bar section 19 Guide 20 Outer stop 21 Inner stop 22 Center stop 23 Overflow bracket 24 Stop element 25 Bearing bracket 26 Bearing element 27 First bend 28 Second bend 29 Third bend 31 Swivel axis 32 Holding groove 33 Support 34 Stop surface

Claims

1. A circular weaving machine (1) for producing a circular fabric (14), comprising: a main axis (2), a reed for guiding a weaving shuttle for weft webs, a supply holder (3) for warp webs (5), a draw-in device (7) for drawing in the warp webs (5) from the supply holder (3), an arrangement of guide and length compensation elements (13) with passages (19) for the warp webs (5) drawn in by the drawing-in device (7), an outer stop (20) against which the guide and length compensation elements (13) are applied in an outer stop position in a basic state unloaded by the warp webs (5), an inner stop (21) against which the guide and length compensation elements are applied in an inner stop position, a middle stop (22) against which the guide and length compensation elements are applied in a working position, wherein the guide and length compensation elements (13) each have a spring bar (16) with a first spring bar portion (17), on which the passage (19) is provided, wherein the first spring bar portion (17) can be deflected in the working position by means of bending up to the inner stop position on the inner stop (21), the spring bars (16) each have a second spring bar portion (18), which presses the guide and length-compensating element (13) into the outer stop position in the basic state unloaded by the warp webs (5) wherein the spring bars (16) are held on bearing holders (25), which are each mounted on a bearing element (26), in particular a bearing ring, wherein the bearing holders (26) are designed as pivot bearing holders, which are pivoted between the working position and the outer stop position during the transition of the guide and length compensation elements (13), characterised in that the pivot bearing holders each have a stop surface (34) which, in the working position, abut against the middle stop (22).

2. The circular weaving machine (1) according to claim 1, characterised in that the spring bars (16) for forming the first spring bar portion (17) and second spring bar portion (18) are each bent at least once by more than 90°, in particular at least once by more than 135°, relative to the outer stop position.

3. The circular weaving machine (1) according to claim 2, characterised in that the spring bars (16) are bent over by more than 135° in relation to the outer stop position in order to form the first spring bar portion (17) and the second spring bar portion (18).

4. The circular weaving machine (1) according to claim 2, characterised in that the spring bars (16) for forming the first spring bar portion (17) and second spring bar portion (18) are each bent at least twice by more than 135°, in particular at least three times by more than 135°, relative to the outer stop position.

5. The circular weaving machine (1) according to claim 1, characterised in that the second spring bar portions (18) are arranged at an angle of less than 30° to the first spring bar portions (17), with respect to the outer stop position.

6. The circular weaving machine (1) according to any of claims 1 to 5, characterised in that the second spring bar portions (18), in particular at their free ends, are each placed under prestress against a stop element (24), in particular against a stop ring.

7. The circular weaving machine (1) according to any of claims 1 to 6, characterised in that the spring bars (16) are arranged detachably, preferably via plug connections, on the bearing holders (26).

8. The circular weaving machine (1) according to any of claims 1 to 7, characterised in that the bearing holders (26) are arranged between the opposite ends of the spring bars (16).

9. The circular weaving machine (1) according to any of claims 1 to 8, characterised in that the spring bars (16) are each held in a retaining groove (32) of the pivot bearing holder.

10. The circular weaving machine (1) according to any one of claims 1 to 9, characterised in that the spring bars (16) are arranged on the pivot bearing holders in such a way that an effective length of the first spring bar portions (16) decreases from the working position toward the inner stop position.

11. The circular weaving machine (1) according to any one of claims 1 to 10, characterised in that the pivot bearing holders each have a hook (34), preferably directed downwards, which restricts the outward pivoting of the pivot bearing holder.

12. The circular weaving machine (1) according to any of claims 1 to 6, 8 to 11, characterised in that the bearing holders (26) are arranged on the ends of the second spring bar portions (18) opposite to the passages (19).

Images