AT518065B1 - circular loom - Google Patents

Abstract

Circular loom (1) with - a main axis (2e); - a Rundriet (2); - a warp-tape feeding device (3a) for feeding warp tapes (4); - At least two along the Rundriets (2) rotating Webschützen (12) each having a coil holder (15) for rotatably supporting a Schussspule (13; 13a, 13b) about its longitudinal axis (16), a Schussspulen-changing device (18) for replacing a The exchange device (18) has at least two grippers (22) for detachable connection to a respective one of the firing spools (13, 13a, 13b), wherein the changing device (18) a frame (25) on which the grippers (22) are each transferable between a gripper stock position and a gripper changing position, the changer (18) having a conveyor (26) for transferring each gripper (22) between the gripper stock position and the gripper change position; wherein as the conveying element (26) an endless element for circulation on the frame (25) of the changing device (18) is provided.

Description

Description: [0001] The invention relates to a circular loom according to the preamble of claim 1.

In the prior art circular looms of this type have long been known. For example, EP 0 786 026 B1 describes a generic circular loom, in which a plurality of shooters in the so-called weaving or traveling compartment circulates between two sets of warp ribbons on a horizontal circular path. The shooters carry shot-wins, from which weft ribbons are delivered to the fabric edge of the produced tubular fabric. The tubular fabric can then be pulled up and folded into a flat tubular fabric. In this prior art, the longitudinal axes of the Schussspulen are oriented substantially in the direction of the tangent to the circular orbital motion of the shooter.

However, the known circular looms bring the disadvantage that the replacement of spent weft coils is cumbersome. So far, the circular loom must be stopped. Thereafter, the weft coils are changed manually. When handling the weft bobbins, special care must be taken to avoid damaging the weft bobbins, the fabric, and possibly even the circular loom.

Accordingly, the object of the present invention is to eliminate or at least alleviate the disadvantages of the prior art. Accordingly, the invention is in particular the goal to simplify the handling of the weft coils and to reduce the downtime of the circular loom.

This object is achieved by a circular loom with the features of claim 1.

The circular loom according to the invention comprises a weft coil changing device for exchanging a recorded in the coil holder weft coil. The changing device has at least two grippers for detachable connection, each with a firing spool. In addition, the changing device has a frame on which the grippers can each be transferred between a gripper storage position and a gripper changing position, the changing device having a conveying element for transferring each gripper between the gripper storage position and the gripper changing position. As a conveying element, an endless element is provided for circulation on the frame of the changing device.

Advantageously, so the replacement of spent weft coils can be significantly simplified. As a result, the staffing can be reduced, and also lower demands on the operating staff can be made. As a result, on the one hand the reliability is increased. On the other hand, the downtime of the circular loom can be shortened. Thus, the performance of the circular loom can be increased and the waste can be reduced.

If a firing coil is consumed, the affected firing coil can be moved to a replacement position on Rundriet. The state of consumption of the weft coil (i.e., the length of the weft ribbon wound on the weft spool) may be detected by a suitable sensor. Thereafter, the upper Kettbändchenschar can be pulled apart to provide access to the coil holder with the Schussspule. The changing device can initially be arranged in a waiting position, which is preferably located completely above the round rake. Thereafter, the changing device can be lowered into a change position, in which the changing device can be brought into engagement with the spent shot coil. By lifting the changer into the waiting position, the firing spool can then be removed from the spool holder of the shuttle. Finally, a full firing coil can be inserted into the coil support to complete replacement of the spent firing coil with a full firing coil.

In a preferred embodiment, the bobbin holder is adapted to rotate the longitudinal axis of the shuttle as the shuttle rotates substantially in the direction of the tangent to the circular orbital motion of the shuttle, i. in a tangential direction in the plane substantially perpendicular to the main axis of the circular loom, to keep.

In an alternative embodiment, the bobbin holder is adapted to the shuttle in order to keep the longitudinal axis of the shuttle in the direction perpendicular to the direction of rotation of the shuttle. In this embodiment, the longitudinal axis of the shuttle may be substantially in the direction of the main axis when the shuttle is in circulation. be arranged substantially vertically, or in the radial direction with respect to the main axis.

For the purposes of this disclosure, the location and direction indications such as "top", "bottom", "vertical", "horizontal", "up", "down", "lift", "lower" etc., on the intended operating condition of the circular loom.

The main axis of the circular loom preferably extends in operation substantially in the vertical direction. The round rake is arranged substantially symmetrically about the main axis of the circular loom.

In order to enable the storage or the change of several Schussspulen, the changing device has at least two grippers for releasable connection with a respective Schussspule. Accordingly, at least two grippers are provided which allow the arrangement of a corresponding number of weft coils, that is, of at least two weft coils. As a result, the changing device is also designed as a magazine. Because of the at least two grippers, therefore, at least one further firing coil can be mounted on the changer device in addition to a firing coil to be dispensed into the coil mount or to be received by the coil mount.

In order to prepare for or complete the replacement of a firing coil, the changing device has a frame on which the grippers can each be transferred between a gripper stock position and a gripper changing position. Preferably, the changing device has at least two functional positions, wherein in each functional position of the changing device exactly one gripper is arranged in the gripper changing position and at least one further gripper in the gripper stock position. In a preferred embodiment, the gripper is pivoted during the transfer of the gripper stock position in the gripper changing position by a pivot angle of preferably substantially 90 °.

To replace a spent shot coil, an empty gripper (i.e., a gripper without a firing spool attached thereto) may be placed in the gripper change position. Thereafter, the changer may be brought from the raised standby position to the lowered change position to engage the gripper with the spent shot coil in the spool holder. Subsequently, the changing device can be transferred upwards to the waiting position. To insert a full firing spool into the spool holder, a gripper with a full firing spool can first be transferred to the gripper changing position. Thereafter, the changing device can be lowered from the waiting position to the change position and the full shot coil are discharged from the gripper into the spool holder.

The changeover process is facilitated by the fact that the changing device has a conveying element for transferring each gripper between the gripper stock position and the gripper changing position. As a conveying element is an endless element, in particular an endless belt or an endless chain, provided for circulation on the frame of the changing device. In this embodiment, a conveying element is mounted on the frame such that the grippers can be moved from the gripper storage position to the gripper changing position and vice versa. For storage of the endless element, the frame preferably has an upper and a lower bearing element, in particular in the form of bearing rollers, around which the endless element rotates during the transfer of the gripper between its storage and gripper changing position.

Preferably, the gripper is designed for a positive connection with the firing spool. In a further embodiment, the gripper and the firing coil have cooperating magnetic elements, so that a magnetic connection between the gripper and the firing coil can be produced. The gripper is designed to take the shot coil during the transfer of the changing device from the waiting position to the change position and vice versa.

For receiving the firing coil from the bobbin holder or for delivering the firing coil in the coil holder, it is advantageous if the gripper has a pair of gripper elements for releasable connection with opposite ends of a firing coil. The gripper elements preferably engage with connection elements of the firing coil, which are preferably arranged symmetrically about the longitudinal axis of the firing coil at the longitudinal ends of the firing coil. For example, the firing spool may have two side windows, at the outer sides remote from the firing ribbon winding, the connecting elements are provided. The connecting elements may in particular have circumferential depressions, on which the gripper elements can engage. To discharge the firing coil into the coil holder, the connection between the gripper elements and the connection elements is released. Accordingly, the connection between the gripper elements and the connecting parts is made when the shute coil is to be lifted out of the coil holder. This variant is particularly advantageous when the coil holder is set up for tangential horizontal storage of the firing coil.

Preferably, the gripper elements are arranged at a distance from each other, which corresponds to the distance between the points of engagement of the gripper elements on the firing spool. If the coil holder for holding the longitudinal axis of the firing spool is arranged essentially in the tangential direction with respect to the main axis of the circular loom, the gripper elements are preferably spaced apart in the tangential direction.

In order to raise the shot coil safely and reliably from the spool holder and to lower the spool holder, each gripper element in a preferred embodiment, two gripper legs which releasing between a fixed at the ends of the firing coil holding position and one of the ends of the firing coil Release position are mutually pivotable. In this embodiment, two gripper arms, each pivotable about a pivot axis, are provided, which can be pivoted apart for fixing or for releasing the firing coil. In a preferred embodiment, a gate is provided on the bobbin holder of the weaving, on which the gripper elements can drive up to release the bobbin for delivery to the bobbin holder. In the case of an empty firing coil, the winding is missing, whereby the backdrop is not engaged and the firing coil can be accommodated. Alternatively, for example, a pneumatic opening means may be provided for pivoting apart of the gripper legs.

In order to reliably ensure the changeover of the changing device, it is advantageous if a guide device is provided for guiding the changing device between the waiting position and the change position.

Particularly preferred is an embodiment in which the guide means comprises a first linear guide for guiding the changing device from the waiting position to an intermediate position and a second linear guide for guiding the changing device from the intermediate position to the change position. In this embodiment, the feed movement of the changing device to the coil holder is divided into two sections. Preferably, the changing device in the waiting position in plan view is at least partially, preferably completely, arranged outside the Rundriets. This means that the changing device protrudes in the waiting position in the radial direction at least over the Rundriet. As a result, the attachment of the changing device is facilitated on the guide device. Advantageously, the guide device in the waiting position for the operator is particularly accessible, so that the handling of the changing device and their replacement is greatly simplified. Starting from the waiting position, the device Wechseleinrich along the first linear guide, i. in a first linear or rectilinear motion, are moved inwardly towards the main axis until the changer enters the intermediate position. Thereafter, the changer is moved along the second linear guide, i. in a second linear or linear motion, lowered from the intermediate position to the change position to allow the reception of a spent shot coil from the spool holder into the changer or the delivery of a full shot spool from the changer to the spool holder. This design allows a particularly simple handling of the changing device by the operator of the circular loom. Furthermore, a simple construction is achieved, which is characterized by low maintenance.

In order initially to achieve an approximation of the changing device to the main axis and then a lowering of the changing device to the coil holder, it is particularly advantageous if the second linear guide extends substantially perpendicular to the first linear guide.

Particularly preferred is an embodiment in which the first linear guide extends substantially perpendicular to the main axis and the second linear guide substantially in the direction of the main axis. Preferably, the first linear guide extends substantially in the radial direction, the second linear guide substantially in the axial direction, in each case relative to the main axis of the circular loom.

In order to arrange the changing device reliably in the intermediate position before the reduction is made in the change position, it is advantageous if a locking device is provided for locking the changing device in the intermediate position. The latching device may for example have a gripper unit with two mutually verschenkba-ren gripper arms, which can be brought into engagement with a corresponding counter element. The gripper unit can in this case be attached to the changing device and the counter element to the guide device. However, it is also a reversed arrangement possible in which the gripper unit is mounted on the guide means and the counter-element on the changing device.

To support the movement of the changing device along the first linear guide and / or along the second linear guide, the guide means may be connected to a first drive unit. In a preferred embodiment, the first drive unit is adapted to accomplish the lowering of the changing device from the intermediate position to the change position. The first drive unit may for example have a rack and pinion drive.

In a preferred embodiment, the guide means comprises a movable guide member having a first leg and a second leg, wherein the movable guide member between an upper position and a lower position along a first stationary guide member is displaceable, wherein the first leg of the movable Guide element in the upper position in extension of a second stationary guide member is arranged, wherein the changing device in the upper position of the movable guide member along the second stationary guide member and the first leg of the movable guide member in the intermediate position and together with the movable guide member from the intermediate position along the first stationary guide element is displaceable in the change position.

In order to facilitate the transfer of the changing device from the first linear guide in the second linear guide, it is advantageous if the first leg and the second leg of the movable guide member are arranged substantially perpendicular to each other. In this embodiment, the first linear guide is formed by the second stationary guide member and the first leg of the movable guide member. The second linear guide results from the linear displacement of the movable guide element along the first stationary guide element.

For the purposes of this disclosure, "stationary" means that the first and second stationary guide element are immovably arranged during the transfer of the changing device from the waiting position to the change position.

In order to facilitate the handling of the changing device, the changing device preferably has a bearing element for releasable connection with the guide device, in particular with the second stationary guide element on. The bearing element is in particular designed to be hooked into the guide device, in particular into the second stationary guide element.

In order to support the transfer of the gripper from the gripper storage position into the gripper changing position and vice versa, the conveying element of the changing device is preferably connected or connectable to a second drive unit.

Particularly preferred is an embodiment in which the second drive unit is mounted on the guide means, wherein the second drive unit is separated in the waiting position of the changing device of the conveying element and connected in the intermediate position with the conveying element. Accordingly, in the transfer of the changing device from the waiting position into the intermediate position, a force-transmitting connection between the second drive unit and the conveyor element can be made, so that the Umlaufbewe-tion of the conveyor element in the intermediate position of the changing device can be done with the support of the second drive unit. Advantageously, the weight of the changing device can thus be reduced, so that the handling of the changing device before its attachment to the guide device is substantially facilitated. Furthermore, it is advantageous that the changing device itself can be kept free of a power supply.

The invention will be explained below with reference to a preferred embodiment, to which it should not be limited, however. In the drawing: Fig. 1a is a perspective view of a circular loom according to the invention with a changing device for exchanging spent weft bobbins against full weft coils, wherein the changing device is shown in an outer waiting position above a Rundriets; 1b, 1c are each a detailed view of the circular loom of Figure 1a in the War testellung. Fig. 2 is a diagrammatic detail view of the machine shown in Fig. 1a, 1b, 1c round weaving machine, wherein the changing device has been moved along a first linear guide in the radial direction inwardly into an intermediate position; Fig. 3a is a perspective view of the circular loom of Fig. 1a to 1c, 2, wherein the changing device has been lowered into a change position for gripping a spent shot coil; Fig. 3b is a further perspective view of the circular loom, wherein the Wech seleinrichtung is shown as in Figure 3a in the change position. Fig. 4 is a view of the changing device of the invention Rundwebma machine in the waiting position (see Fig. 1a, 1b, 1c), wherein eight full weft coils was arranged in lateral storage positions and an empty gripper for a spent shot coil in a lower Greifenwechselposition ; Fig. 5 is a view of the changing device according to Fig 4 in the intermediate position, wherein the empty gripper is located above and at a distance to the spent shot coil on the (not shown in Figure 5) coil holder. Fig. 6 is a view of the changing device according to Figure 5 in the change position, wherein the gripper has taken on the underside of the changing device, the spent shot coil. Fig. 7a is a view of the changing device, which has been moved starting from the position of Figure 6 upwards in the intermediate position, wherein the empty weft coil is still arranged in the gripper changing position. FIG. 7b shows a side view of the changing device in the position according to FIG. 7a; FIG. Fig. 8 is another view of the changing device, starting from the

Position shown in Figure 7a, 7b a full shot coil in the gripper change position and the spent shot coil was placed in a gripper storage position. and [0045] FIG. 9 is a further view of the changing device of the circular machine according to the invention, from which the holder of the weft bobbins on the grippers of the changing device can be seen.

In the drawing there is shown a circular loom 1, the basic structure of which has been known for a long time in the prior art (cf., for example, EP 0 786 026 B1 or EP 2 829 645 A1). The circular loom 1 is provided for the use of tapes, threads, monofilaments and multifilaments as Kettbändchen and Schussbändchen.

The circular loom 1 has a Rundriet 2, which is arranged around a in the operating position shown substantially vertically extending main axis 2e. Usually, the main axis 2e runs along a machine shaft (not shown).

The circular loom 1 comprises a warp-feeder 3a having a plurality of warp-tape guiding elements 3b, which are formed as length compensating compensators each comprising a spring bar and an eyelet at the upper end of the spring bar for passing and deflecting a warp tape 4. The warp-tape guiding elements 3b are arranged distributed around the round pile 2 of the circular loom 1. For better clarity, only one feeder 3a is shown in a schematic representation. The round reed 2 comprises an upper hoop 2a and a lower hoop 2b between which a plurality of reed bar segments 2d are uniformly distributed with spaces between adjacent reed bars. The warp strips 4 are passed through the warp ribbon guide elements 3, not shown, by the warp ribbon guide elements 3 and further through the spaces between the reed rods.

Between the warp-tape guiding elements 3b and the round pile 2, shedding means 5 are arranged around the round pile 2. The shedding means 5 comprise a plurality of first strands 6 and a plurality of second strands 7, which are connected together at their ends and wrap around an upper roller and a lower roller 8a. Each of the first strands 6 has an eyelet through which a warp tape 4 is passed. These warp strips 4, which are passed through the loops of the first strands 6, form a first warp band 10. Each of the second strands has an eyelet, through which a warp tape 4 is passed. These looped through the eyelets of the second strands 7 Kettbändchen form a second Kettbändchenschar 11. Alternatively Ösenbänder can be used. In one embodiment, a lever driven by an eccentric moves the loop of hoop around the fixed rollers up or down (not shown). As a result, the two Kettbändchenscharen 10, 11 is given a mutually opposite reciprocal movement up or down, creating a shed 9 (also called moving compartment) is opened and closed. The shed 9 forms in the open state one of the two Kettbändchenscharen 10, 11 defined space in which a weaver 12, which carries a Schussbändchenspule (hereinafter short-shot coil) 13, moves on a circular path along the Rundriets 2 and thereby not shown Draws ribbon from the weft coil 13 carried by him and enters into the shed 9. The shed 9 is closed when the strands 6, 7 are in a central position in which the eyelets of the first strands 6 and the second strands 7 are at the same height, whereby both Kettbändchenscharen 10, 11 lie in the same area or together this Stretch the surface. In other words, the surface of the closed shed 9 is substantially the bisecting line between the first Kettbändchenschar 10, which is the upper Kettbändchenschar in Fig. 1a, and the second Kettbändchenschar 11, which is the lower Kettbändchenschar in Fig. 1a. It is therefore the case that the angle between the first warp sheet 10 and the surface is equal to the angle between the second warp sheet 11 and the surface. The surface is also defined as the surface containing the geometric connecting lines between the warp-knitting guide elements 3b and the weaving ring 14.

The size of the defined by the two Kettbändchenscharen 10, 11 space of the shed 9 changes constantly with the opposite movement of the two Kettbändchenscharen 10, 11, starting at zero with a closed shed. The space of the shed 9 reaches a maximum when the two Kettbändchenscharen 10, 11 are located at the opposite reversal points of their reciprocal change movement, as shown in Fig. 1a. At these points of reversal, the so-called change of subject begins by reversing the movement imparted to the opposing chains of bands 10,11. By changing the tray the last entered in the shed 9 Schussbändchen is fixed in the tissue, and it can be entered by the next shooter 12, the next weft ribbon in the shed. As can be seen in FIG. 1a, an even number of weavers 12, for example eight weavers 12, run at equal distances from each other in the round pile 2 (in FIG. 1 a only two shooters 12 are shown for the sake of clarity). The generated tubular fabric is guided inwardly to a centrally located Webring 14, where it is deflected to (not shown) take-off rollers out.

As can be seen schematically from Fig. 1a, the shuttle 12 has a spool support 15 which connects the longitudinal axis 16 of the spool 13 substantially parallel to a tangent to a direction of rotation 17 of the shuttle 12 on the spool 2, i.e., the spool. essentially in the tangential direction with respect to the main axis 2e.

As can be seen from the drawing, the circular loom 1 further comprises a weft changing device 18 for exchanging spent weft bobbins 13a (see, e.g., Fig. 3b) in the bobbin holders 15. According to FIG. 1 a, the changing device 18 is shown in a waiting position, in which the changing device 18 can be detachably connected to a guide device 19 by an operator of the circular loom 1. In the waiting position, the changing device 18 is located in the radial direction, relative to the main axis 2e, outside of the round rake 2. In addition, the changing device 18 in the waiting position in the axial direction, again relative to the main axis 2e, arranged above the Rundriets 2. As a result, the changing device 18 can be attached to the guide device 19 from the outside or removed therefrom. The guide device 19 has a first linear guide 20 for guiding the changing device 18 from the waiting position in the same height position inwards into an intermediate position and a second linear guide 21 for guiding the changing device 18 from the intermediate position down into the changing position. The second linear guide 21 extends substantially perpendicular to the first linear guide 20. In the embodiment shown, the first linear guide 20 extends substantially perpendicular to the main axis 2e in the radial direction, whereas the second linear guide 20 substantially in the direction of the main axis 2e, i. in the axial direction, extends. Thus, the changing device 18 can be displaced from the waiting position along the first linear guide 20 in the radial direction inwardly into the intermediate position and then from the intermediate position in the axial direction down to the change position. The guide device 19 has in the embodiment shown two first linear guides 20 and two second linear guides 21, which are designed to guide opposite longitudinal sides of the changing device 18. The following statements relate equally to both first linear guides 20 and second linear guides 21.

The changing device 18 has a plurality of grippers 22 for gripping or holding the weft coils 13. In the embodiment shown, the changing device 18 has nine grippers 22, to which a corresponding number of weft coils 13 can be attached. In the illustrated state of Fig. 1a, eight full weft bobbins 13b are disposed on the changer 18, with a gripper 22 on the underside of the changer 18 being empty, i. free of a shooting coil 13, is.

Each gripper 22 has a pair of gripper members 23 for releasable connection to opposite ends of a shuttle 13. The gripper elements 23 each have two gripper legs 24a, which together form a recess 24b for receiving connecting elements 24c of the weft spools 13 (compare FIG. 9).

In Fig. 9, the structure of the Schussspulen 13 and the Flalerung the Schussspulen 13 can be seen on the changing device 18, wherein only for reasons of better understanding of individual grippers 22, the items of the Schussspulen 13 are shown. Accordingly, the weft coils 13 seen in the direction of the longitudinal axis 16 have two ends on which the connection elements 24c are arranged. The connection elements 24c project outward from side windows 13c of the weft coils 13. On the connecting elements 24c circumferential recesses 24d are formed, which are formed as engagement points for the gripper arms 24a. In the connected state, the firing spool 13 is fastened to the gripper elements 23 of the grippers 22 via the connection elements 24c.

The gripper arms 24a are pivotable relative to each other between a holding position holding the connecting elements 24c at the longitudinal ends of the firing coil 13 and a release position which releases the connecting elements 24c of the firing coil 13.

As can be seen in particular from FIGS. 4 to 9, the changing device has a frame 25 on which the grippers 22 can each be transferred between a gripper stock position and a gripper changing position. In the illustration of Fig. 4, the gripper 22 are arranged with the eight full Schussspulen 13b each in a gripper storage position, whereas the gripper 22 is arranged at the bottom in the gripper changing position.

For transferring a gripper 22 from the gripper storage position to the gripper changing position, the changing device 18 has a conveying element 26, which in the embodiment shown is designed as an endless belt which is set up for full circulation on the frame 25 of the changing device 18. Thus, each gripper 22 can be placed in one of the eight gripper stock positions or in the gripping change position. The grippers 22 are arranged at intervals on the conveying element 26 as viewed in the direction of conveyance or circulation. In the gripper storage positions, the weft spools 13 are arranged lying horizontally one above the other on both longitudinal sides of the frame 25 of the changing device 18. In the embodiment shown, four gripper storage positions are formed on each longitudinal side of the frame 25 and exactly one gripping change position on the underside of the frame 25.

From FIGS. 4 to 9, furthermore, the guide device 19 for guiding the changing device 18 between the waiting position and the change position can be seen on a larger scale.

Accordingly, the guide device 19 has a movable guide element 27 consisting of a first leg 27a and a second leg 27b, wherein the first leg 27a and the second leg 27b are arranged substantially perpendicular to each other. The movable guide member 27 is slidable between an upper position and a lower position along a first fixed guide member 28. The first leg 27a of the movable guide member 27 extends in the upper position a second stationary guide member 29. The changer 18 is in the upper position of the movable guide member 27 from the standby position (see Fig. 4) along the second stationary guide member 29 and the first Leg 27a of the movable guide member 27 in the intermediate position (see FIG .. 5) slidably before the changer 18 is displaceable together with the movable guide member 27 from the intermediate position along the first stationary guide member 28 in the change position (see Fig .. 6).

The guide device 18 is connected to a first drive unit 30, with which the transfer of the changing device 18 along the second linear guide 21 is driven. In the embodiment shown, the first drive unit 30 has an electric motor 31 which is connected via an output shaft 32 and a gear 33 to the second leg 27b of the movable guide element 27 designed as a toothed rack (cf. FIG. 4). The gear 33 is meshed with the rack of the second leg 27b of the movable guide member 27 to accomplish the rotational movement of the output shaft 32 in the linear movement of the movable guide member 27 along the first stationary guide member 28.

The changing device 18 has a bearing element 34 for detachable connection to the second stationary guide element 29 of the guide device 19. As a bearing element 34, a roller is provided in the embodiment shown, which runs along the second stationary guide member 29 and the first leg 27a of the movable guide member 27. For this purpose, the second fixed guide member 29 and the first leg 27a of the movable guide member 27 are each formed as a guide rail. The fixed guide elements 28, 29 are fastened to a frame 35.

Furthermore, in the drawing, a locking device 36 can be seen, with which the changing device 19 can be latched upon reaching the intermediate position. The latching device 36 has a gripper unit 37 with two mutually pivotable gripper arms 38, which can be brought into engagement with a corresponding counter element 39. The gripper unit 37 is in this case attached to the changing device 18 and the counter element 39 on the guide device 19.

In the embodiment shown, a second drive unit 40 is also provided, with which the circulation movement of the conveying element 26 is driven on the frame 25 of the changing device 18. The second drive unit 40 is in this case mounted on the movable guide element 27 of the guide device 19, wherein the second drive unit 40 is separated in the waiting position of the changing device 18 of the conveying element 26 and connected in the intermediate position with the conveying element 26. For this purpose, the second drive unit 40 has a drive, in particular an electric drive 41, whose output shaft can be coupled to a drive shaft of the conveyor element 26 via a connecting element 42 conical in the illustrated embodiment. The connecting element 42 can be extended in the intermediate position in order to produce a torque-transmitting connection with the conveying element 26.

In the drawing, only necessary for understanding the invention components of the circular loom 1 are shown, with numerous known in the prior art components have been omitted for the sake of clarity or only schematically indicated. For example, in the drawing, a sucker 43 can be seen, with which the weft ribbons can be sucked by the weft coils 13.

Claims (15)

claims 1. circular loom (1) with - a main axis (2e); - a Rundriet (2); - a warp-tape feeding device (3a) for feeding warp tapes (4); - At least two along the Rundriets (2) circulating weavers (12) each having a coil holder (15) for rotatably supporting a Schussspule (13; 13a, 13b) about the longitudinal axis (16), characterized by - a Schussspulen-changing device (18) for exchanging a weft spool (13; 13a, 13b) accommodated in the spool support (15), wherein the changer (18) comprises at least two grippers (22) for releasable connection to a respective one of the weft spools (13; 13a, 13b), wherein the changer means (18) has a frame (25) on which the grippers (22) each between a gripper storage position and a gripper changing position can be transferred, said changing means (18) comprises a conveying element (26) for transferring each gripper (22) between the gripper stock position and the Gripper change position, wherein as the conveying element (26) an endless element for circulation on the frame (25) of the changing device (18) is provided. 2. loom (1) according to claim 1, characterized in that as endless element, an endless belt or an endless chain for circulation to the frame (25) of the changing device (18) is provided. 3. circular loom (1) according to claim 1 or 2, characterized in that the frame (25) has an upper and a lower bearing element, in particular in the form of bearing rollers, around which the endless element with the grippers (22) rotates. 4. loom (1) according to one of claims 1 to 3, characterized in that the conveying element (26) is adapted to the gripper (22) during the transfer of the gripper stock position in the gripper changing position by a pivoting angle of substantially 90 ° pivot. 5. loom (1) according to one of claims 1 to 4, characterized in that the gripper (22) has a pair of gripper elements (23) for releasable connection to opposite ends of a shooting coil (13). 6. loom (1) according to claim 5, characterized in that each gripper element (23) has two gripper arms (24a) which between a fixed to the ends of the firing coil (13) holding position and the ends of the firing coil (13) releasing the release position are mutually pivotable. 7. circular loom (1) according to one of claims 1 to 6, characterized in that the changing device (18) between a lowered to the coil holder (15) changing position and one of the coil holder (15) standby position can be transferred, wherein a guide device (19 ) is provided for guiding the changing device (18) between the waiting position and the change position. 8. circular loom (1) according to claim 7, characterized in that the guide device (19) has a first linear guide (20) for guiding the changing device (18) from the waiting position to an intermediate position and a second linear guide (21) for guiding the changing device ( 18) from the intermediate position to the change position. 9. loom (1) according to claim 8, characterized in that the second linear guide (21) extends substantially perpendicular to the first linear guide (20). 10. circular loom (1) according to claim 8 or 9, characterized in that the first linear guide (20) substantially perpendicular to the main axis (2e) and the second linear guide (21) substantially in the direction of the main axis (2e) is extended. 11. circular loom (1) according to one of claims 8 to 10, characterized in that a latching device (36) for latching the changing device (18) is provided in the intermediate position. 12. Circular loom (1) according to any one of claims 8 to 11, characterized in that the guide means (19) comprises a movable guide member (27) having a first leg (27a) and with a second leg (27b), wherein the movable guide member (27) is displaceable between an upper position and a lower position along a first fixed guide member (28), wherein the first leg (27a) of the movable guide member (27) in the upper position is arranged in extension of a second fixed guide member (29) wherein said changing means (18) in the upper position of the movable guide member (27) along the second fixed guide member (28) and the first leg (27a) of the movable guide member (27) in the intermediate position and together with the movable guide member (27) from the intermediate position along the first stationary guide element (28) displaceable in the change position is. 13. Circular loom (1) according to one of claims 7 to 12, characterized in that the changing device (18) has a bearing element (34) for releasable connection with the guide device (19), in particular with the second stationary guide element (29). 14. circular loom (1) according to one of claims 1 to 13, characterized in that the conveying element (26) of the changing device (18) with a second drive unit (40) is connected or connectable. 15. Circular loom (1) according to claim 14, characterized in that the second drive unit (40) on the guide means (19) is mounted, wherein the second drive unit (40) in the waiting position of the changing device (18) of the conveying element (26). separated and connected in the intermediate position with the conveying element (26). For this 13 sheets of drawings