EP3850133B1 - Weaving machine having a device for selecting the weft thread colour - Google Patents

Description

The invention relates to a weaving machine with a weft thread color selection device having the features according to the preamble of claim 1.

Weft thread color selection devices for weaving machines are required if weft threads of different colors and/or different material properties are used in the production of a multicolored fabric. However, they are also used for single-colored fabrics with the same weft thread materials, for example to reduce the load on the bobbins when weft threads are drawn off. Weft thread color selectors of this type are known. The weft thread transfers used on rapier weaving machines are characterized by the fact that transfers with up to 16 colors are sometimes possible, but this presents a handicap for the weaver in terms of operation, because the view of the thread eyelets in particular is not only difficult, but often completely is covered or the insertion of a weft thread is difficult in practice, which can lead to incorrect insertions.

The known weft thread transfers also have the disadvantage that the weft threads have to be strongly deflected in thread guide eyelets before they are handed over and transferred to, for example, a gripper, which can definitely damage the weft thread yarn. This restricts the production of high-quality fabrics, particularly because these types of damage are visible in the fabric.

In CN 101 314 881 B a weft thread color selection device is described, in which weft threads of different colors or types are each guided through eyelets arranged next to one another in a color selection disc. The color selection disc with the individual eyelets makes it possible, when the same is moved, to bring a weft thread to be inserted into a position in which a delivery needle can transfer the weft thread to a gripper. Since the gripper runs below the color selector device, the respective weft thread must be pressed or guided down to the gripper by means of the delivery needle immediately after it has exited the color selection disc, so that the gripper can take over the thread. A hard deflection of the weft thread with possible damage to the same is unavoidable.

In CN 105 274 712 A2 a color selection disk is described as the weft thread color selection device, which has guide eyelets on its outer circumference, through which weft threads of different colors and/or types are guided. An arrangement in the immediate vicinity of a handing needle to the color selection disk is described in this known weft thread color selection device, which is intended to ensure a somewhat gentler handling of the weft threads when they are fed to a gripper, but each weft thread experiences a relatively hard deflection when the weft thread is transferred to the grasping gripper before it is inserted into a shed. This not inconsiderable deflection in the closed eyelets in the color selection disc is well suited for guiding the weft threads, but the weft threads are not necessarily guided gently.

In DE 38 08 777 A1 describes a device for selectively feeding a weft thread from a number of multiple weft threads to a gripper projectile. A feeder clamp is provided for each individual weft thread to hold this weft thread so that the respective weft threads can be fed to the gripper. The clamping device is designed as a rotatably mounted ring with a ring clamp which, on its circular movement, stretches the weft thread released by the presentation clamp across the imaginary extension of the gripper track. The number of weft threads corresponding to the number of weft threads to be provided, with corresponding devices for carrying out the respective clamping effect, is mechanically quite complex and does not solve, for example, the problem of accessibility of the weft threads when changing weft threads, nor does it solve the damage to the weft threads as a result of the clamping effect by the weft threads.

Furthermore, in JP 2001/131847 A a weft thread color selection device is described, in which a weft thread ring is provided with a plurality of weft thread guide eyelets, in which a weft thread is guided. By turning the weft thread ring, a selected weft thread is always brought to a predetermined position from which it can be gripped by means of a pivoting lever with a hook at its tip and transferred to be inserted into a shed. The disadvantage of this known weft thread color selection device is that the rotatable weft thread ring is twisted in relation to a stationary weft thread ring. Each time a specific weft thread is handed over or selected, all the weft threads arranged between the fixed and the rotatable weft thread ring are twisted, as a result of which they experience some hard deflections in the closed thread guide eyelets.

In EP 1 500 731 B1 describes a weft feeding device for weaving machines with a single feeding rod. The weft thread guide has a perforated plate and a feed fork, the movement of which is controlled by two drives which are coupled to one another via a linkage. One drive is provided for the linear movement of the feeder fork and the other drive for a rotary or pivoting movement. The color selection device does not have a color selection disc and has only closed eyelets for all weft thread guide eyelets, so that the weft threads are sometimes subjected to several and also hard deflections until they are reached for grasping, for example by means of a gripper.

And finally is in GB 1 002 093 A describes a weft thread changer for weaving machines with grippers. To change a weft thread to a weft thread of a different color, a plate-shaped lever with a closed eyelet is pushed in the direction of the transfer point to the gripper. However, each weft thread of a different color has its own plate-shaped lever.

In contrast, the object of the present invention is to provide a weft thread color selection device for a weaving machine which avoids the disadvantages of known devices such as twisting the weft threads between the stationary thread guide and the color selection disc and minimizes or excludes damage to the weft threads as a result of deflection when the weft thread is provided. A further object of the present invention is to provide a weft thread color selection device for a weaving machine, which does not obscure the weaver's view of the thread eyelets when they are passed in such a way that a weaver is not able to comfortably pull in the weft thread, and which has the largest possible number of weft threads can be held up for entry without the line spacing having to be reduced significantly, i.e. without the line density having to be increased significantly.

This problem is solved by a weaving machine with the features according to claim 1. Expedient developments are defined in the dependent claims.

According to the invention, the weaving machine has a weft thread color selection device, by means of which individual weft threads from a number of provided weft threads can be fed to a gripper in a selected sequence. The weft thread color selector has a Thread guide, by means of which the weft threads, which are supplied by a prewinder, can be fed via the thread guide of the weft thread color selection device. The weft thread color selection device has thread guide eyelets, which can be moved with a first drive for the color wheel in such a way that a respective, selected weft thread can be brought into its respective delivery position. The thread guide eyelets each take at least one weft thread for its selection and delivery to the gripper for weft insertion into the shed. The weft thread color selection device now has such a number of thread guide eyelets that the number of weft threads of different colors or different materials that are required for the fabric to be woven can be kept in reserve, so that from the large number of weft threads provided for a weft insertion, that one is selected in each case which is required for the weaving pattern of the fabric.

The handing over position is to be understood as the position in which a thread guide eyelet, namely that thread guide eyelet from which the weft thread guided therein is to be fed to the gripper, is positioned such that the thread guide eyelet for the selected weft thread is assigned to the gripper with regard to its radial direction.

A delivery needle, which is driven by a second drive, now feeds the weft thread selected for weft insertion from the delivery position to the gripper, in which this weft thread is clamped, so that it is inserted through the shed into the shed by the movement of the gripper. Irrespective of the number of weft threads held in front, this arrangement of color disc and delivery needle ensures that each weft thread is fed to the gripper from the same position and under essentially identical conditions. Identical conditions therefore prevail for each weft thread when it is transferred to the gripper. The positive aspect of such an arrangement is that the adjustment and pick-up position of the presented weft thread are made much easier by the gripper. In known systems with, for example, a number of delivery needles corresponding to the number of weft threads, the distance between the first and last delivery needle becomes larger, as a result of which the system is more error-prone.

According to the invention, the thread guide eyelets of the weft thread color selection device are designed in such a way that they are open to the outside at least in their reaching position. The outside is to be understood as the side of the thread guide eyelet which faces the gripper or the clamping element, by means of which the weft thread is inserted into the shed, faces. Because at least the thread guide eyelet from which a weft thread is being passed to the gripper is open in the direction of the gripper, the weft thread, when it is gripped by the delivery needle and fed to the gripper, is used to transfer the selected weft thread to the Looper guided out of the thread guide eyelet via its open outside without deflection. This represents an extremely gentle transfer of the weft thread from the thread guide eyelet to the gripper, because when the weft thread intended for insertion is transferred by means of the brain calibration needle, the selected weft thread is no longer deflected. Damage to the weft thread as a result of a deflection that is otherwise present, which is also quite hard, is thus ruled out according to the invention.

According to a first exemplary embodiment of the invention, the weft thread color selection device has a color disc which has a defined number of thread guide eyelets which are arranged in its outer peripheral area, each thread guide eyelet having an opening running radially to the outside of the color disc.

The color wheel is preferably driven to rotate by the first drive, which ensures that the selected weft thread is rotated with its thread guide eyelet or with the opening of the thread guide eyelet in such a way that the opening points towards the gripper and thus assumes the handing-over position for the gripper Has. This is to be understood here as meaning that the thread is aligned with the gripper with regard to its opening in the thread guide eyelet, and can therefore be gripped by the handing needle in the next step in the handing-over position and fed directly to the gripper. The delivery position is therefore not the position which the weft thread assumed immediately when it was transferred to the gripper by the delivery needle. By moving the delivery needle in the direction of the rapier, the selected weft thread is guided out of the open thread guide eyelet and can thus be fed to the rapier. This is made possible by the fact that the opening of the thread guide eyelet points towards the gripper and in this position the delivery needle preferably grips the weft thread in the direction of the opening of the thread guide eyelet on the outside of the colored disc and feeds it to the gripper.

However, the movement of the passing needle does not necessarily have to take place in the radial direction of a line which runs through the pivot point of the color disc and the opening of the thread guide eyelet from which the weft thread is to be fed. Rather, it is sufficient if the delivery needle transfers the weft thread to the gripper with respect to the color disk via a directional component relative to the color disk with at least one direction component running in the radial direction. A deviation from an exactly radial direction of movement of the delivery needle can be structural or functional.

Preferably, the open thread guide eyelets that are not in their delivery position can be closed or secured or blocked or possibly also covered by means of a bolt to secure the respective weft thread in the respective thread guide eyelet, with the bolt closing the thread guide eyelets having a slot which is always arranged at the handing over position and, after alignment of the colored disc with the opening of the thread guide eyelet for the weft thread to be inserted, points towards the slot and thus towards the gripper. As a result, the weft thread to be inserted can be fed from the open thread guide eyelet through the slot of the bolt to the gripper without being deflected. The colored disk can be rotated relative to the bar with the first drive in such a way that the slot always releases only the thread guide eyelet from which the weft thread is transferred to the gripper.

The bar can be arranged in the feeding direction of the weft thread before, at the level of or after the color wheel. If the bolt is arranged before or after the colored disk, the bolt is preferably designed as a disk or disk segment analogous to the colored disk in the sense of a double disk arrangement and has a slot running radially to its outer circumference, which is arranged in the reaching position and represents an opening which allows the weft thread to be fed to the gripper without deflection for each thread guide eyelet of the colored disk in its handing-over position. The bolt is preferably arranged close to the colored disk, preferably even touching it.

If the bolt is arranged at the level of or in the plane running through the colored disk, the bolt can preferably be designed as a ring segment-shaped bolt which surrounds the colored disk in a spatially fixed manner, so to speak, as a ring or ring segment, preferably enclosing it and thus covering the thread guide eyelets of the colored disk. With Except for that thread guide eyelet which has been rotated into the handing-over position, at which the bar has a slot for guiding the weft thread out without deflection and feeding it to the gripper. Preferably, a locking ring in the shape of a ring segment is normally attached to the outer circumference of the colored disc that has the open thread guide eyelets, and its shape is congruent with the smooth outer circumference of the colored disc. This ring-segment-shaped bar serves to close off the open thread guide eyelets, with the exception of the thread guide eyelet of the weft thread, which is in the handing over position for immediate transfer by means of the handing needle to the gripper. Closing the other outwardly open thread guide eyelets serves to ensure that the weft threads do not fall out of their respective open thread guide eyelets or get lost.

After the weft thread has been picked up by the rapier, the thread tensioned by the insertion into the shed is guided back through the slot into the thread guide eyelet of the color wheel by the movement of the delivery needle and is thus inserted without being deflected. As soon as the starting position of the handing needle has been reached, it is possible to rotate the color disc to the new handing position to be handed in, or if the color to be entered is the same, the handing position of the color wheel remains.

According to a further exemplary embodiment, the colored wheel is preferably designed in two parts. A first partial color disc and a second partial color disc are preferably provided, which are driven independently of one another by means of controllable drives and according to the invention also each have thread guide eyes open to the outside. Due to the fact that the color disk consists, strictly speaking, of two color disks, namely the first partial color disk and the second partial color disk, and each partial color disk is driven independently of the other by means of controllable drives, with two partial color disks and the delivery needle, at least three preferably independent drives are required, so to speak, one each Drive for the respective partial color wheel and a drive for a handing needle. However, it is also possible for further partial color discs to be provided, with each partial color disc then having a separate drive. It is also possible for more than one delivery needle to be provided, so that a respective drive may also be provided for each delivery needle.

The second partial color disk can be arranged in the weft insertion direction in a plane in front of or behind the first partial color disk and essentially parallel thereto. The second Partial color disc is designed, so to speak, in a layered arrangement with respect to the first partial color disc. Layered arrangement means only the spatial arrangement. A connection to the first partial color disk is only provided with regard to the fact that both partial color disks have a separate drive, which enables independent pivoting of the respective partial color disk relative to the other partial color disk. However, the pivoting movement of the two partial color discs relative to one another must be coordinated in such a way that the positions of the thread guide eyelets open to the outside can be coordinated with one another so that the respective weft threads, namely the weft threads that are guided in the thread guide eyelets of the first partial color disc, as well as the weft threads , which are guided in the open thread guide eyes of the second partial color disc, can be handed over to a gripper. The radial extent of the second partial color disk from its point of rotation to the outside is preferably less than this radial distance in the case of the first partial color disk.

An essentially parallel arrangement of the partial color disks to one another should also include smaller deviations from parallelism, which can amount to up to 15 to 20° due to the function or arrangement.

In addition to the thread guide eyelets that are open on the outer circumference and towards the outer circumference, the first partial color wheel preferably has a longitudinal slot that is configured essentially parallel to the curvature of its outer circumference. This longitudinal slit extends with essentially the same curvature, so to speak, within the first partial color disc without a direct connection to the thread guide eyelets that are open to the outside. From the longitudinal slot in the first partial color disc, a passage or a slot is provided, which realizes a connection from the interior of the longitudinal slot to the outside or to the outer circumference of the first partial color disc. The weft threads, which are guided inside the curved longitudinal slit, cannot unintentionally fall out of the respective thread guide eyelets of the second partial color disc through this longitudinal slit. Rather, it is only possible for these weft threads, which are guided there in the longitudinal slit, to be guided out via the passage or the slit. Thus, the weft threads, which are fed to the gripper from the second partial color disc, are led out via the first partial color disc, because the leading out takes place via the passage connecting the longitudinal slot with the outside of the first partial color disc. The passage is preferably arranged centrally in the first partial color disc. However, it is also possible for certain applications to provide this passage off-centre. Central arrangement of the passage is closed understand that the first partial color disc is designed as a disc segment and the bisector of which coincides with the arrangement of the passage.

So that the weft threads can be reliably guided out both from the first partial color disk and from the second partial color disk and can be fed to the gripper with the delivery needle, the first and the second partial color disk can be pivoted relative to one another in such a way that, in order to feed a weft thread from the respective thread guide eyelet in the second partial color disc, this thread guiding eyelet is brought into alignment with the passage, so that this weft thread can be fed to the gripper by means of the delivery needle from the second partial color disc via this passage, i.e. via the first partial color disc. The first and second partial color discs are now pivoted in such a way that the passage in the first partial color disc always coincides with the weft thread and thus the thread guide eyelet of the second partial color disc, from which a corresponding weft thread is to be fed to the gripper and introduced into the shed.

In the case of a double weft insertion, it must be ensured that the delivery needle intended for the double weft, which can have a double receiving eyelet, i.e. a double lowering, in order to be able to feed two weft threads simultaneously to a rapier head with a single delivery needle, a first weft thread from a thread guide eyelet of the first partial color disk and a corresponding second weft thread from a thread guide eyelet of the second partial color disk by means of the double lowering and can feed the gripper. For this purpose, there must be no weft thread adjacent to the guide eyelet that guides the second weft thread in the second partial color disc, because otherwise the delivery needle would seize another weft thread. However, the delivery needle could not lead this further weft thread out of the thread guide eyelet and feed it to the gripper, since this thread guide eyelet is not located at the passage of the longitudinal slot in the first partial color disk.

According to a further exemplary embodiment, the first and the second partial color disks are not arranged one behind the other in the weft thread insertion direction, but essentially in one plane, with this plane extending essentially perpendicularly to the weft thread insertion direction. Also according to this exemplary embodiment, the first and second partial color disks each have their own drive, so that both partial color disks can also be moved essentially independently of one another.

According to this exemplary embodiment, the colored disc is designed as a disc segment and is preferably divided in the middle of the angle bisecting the segment. The separate drives for both partial color disks can, for example, move one partial color disk from the operating position into a parking position, so that at least the weft threads can only be fed to the gripper from the other partial color disk in the operating position for a certain time. Such a mode of operation makes sense, for example, if the number of weft threads to be kept available is relatively high, so the segment angle of the color wheel is relatively large overall and larger pivoting paths would therefore be required, for example to pass through a weft thread that is arranged on the far left when looking at the color wheel to replace a weft thread, which is arranged in the thread guide eyelet on the far right in the same viewing direction. If, for example, depending on the type of weft thread to be inserted, a certain number of weft threads are used during a predetermined weaving time, which are guided in one of the partial color discs in its thread guide eyes, then in this operating position reliable operation and reliable provision of corresponding weft threads can be achieved via only this one partial color disc be reached. Only when a weft thread that is not used that often is to be inserted, or if a second group of weft threads is only needed from time to time, can the partial color wheel that was in the operating position be pivoted out of its operating position into a parking position. The other partial color wheel is then pivoted back out of its parking position into its now desired operating position. Above all, when there is a large number of weft threads that are not to be used all at the same time with the same frequency, this type of divided color wheel is advantageous in terms of shortening the movement paths of the color wheel.

Due to the fact that the drives for the two partial color discs can work independently of one another, it is also possible that for certain applications in which the frequency of the weft threads to be inserted does not vary significantly, both drives for both partial color discs can be coordinated with one another in such a way that the movement of the two partial color disks in the sense of an integral color disk takes place as if the color disk was formed in one piece. The division of the color disc into two partial color discs therefore offers overall greater flexibility in the selection of the corresponding weft threads to be inserted than if only a single color disc were present in a non-divided design.

According to a second exemplary embodiment, the weft thread color selection device is designed at least as an elongate element in which thread guide eyelets are arranged next to one another and each guide at least one weft thread. The thread guide eyes are in turn open via an edge of the elongate element facing the gripper. This is to ensure that only the weft thread that is about to be inserted and that is in the delivery position can be fed to the gripper. So that the other weft threads do not accidentally or unintentionally fall out of an open thread guide eyelet, a bar designed as a longitudinal bar is preferably provided, which has a slot in the reaching position of the elongate element.

The yarn guide eyes are open with their edge in the direction of a plane in which the gripper works. This ensures that the weft thread introduced into the shed via the open edge of the thread guide eyelet is fed to the gripper without being deflected in the reaching position. So that the weft thread does not undergo a sharp deflection when the weft thread to be inserted is passed, the elongated element and thus the thread guide eyelet or the one from which the weft thread is to be inserted into the shed is pushed or moved sideways in relation to the fixed longitudinal bartack in the direction of the gripper that the weft thread can be fed out of this open thread guide eyelet via the slot in the longitudinal bartack and fed to the gripper.

Preferably, the elongate member has a first drive, which is preferably a linear motor. This first drive moves the elongate element in the direction of its longitudinal extent by pushing, pulling or pushing in such a way that that thread guide eyelet which just has the weft thread which is to be transferred to the gripper reaches its reaching position for the slot in the bartack. However, this drive can preferably also be a hydraulic cylinder or a pneumatic cylinder, with this first drive being designed in such a way that a linear drive movement is made possible for the movement of the elongate element in its longitudinal extent. This is equally possible using known mechanical systems such as toothed belts, cranks, etc., which can also be used for a color wheel. However, it is also possible for the elongate element to consist of two separate parts, each of which has its own first drive for moving it in the respective longitudinal extension. It can thus be ensured that the length of the elongate element can be halved, for example, in order to obtain a greater compactness of the weft thread color selection device.

Preferably, the open thread guide eyelets that are not in their reaching position are closed or covered or can be covered or closed by means of the longitudinal bar to secure the respective weft thread in its respective thread guide eyelet. The elongate element can therefore be moved relative to the longitudinal bar in such a way that only the thread guide eyelet located in the selected delivery position is kept open because the longitudinal bar has its slot there. From this thread guide eyelet, the weft thread intended for entry into the shed is brought to the gripper by means of a delivery needle. The passing needle is preferably designed as a pivoting bracket and has a second drive for pivoting the pivoting bracket from a non-handing position via a handing-over position into a transfer position. The swivel bracket is designed with such a bracket height that the weft threads held in reserve for weft insertion in the elongate element can be passed over without contact by the delivery needle when the respective weft thread is in the delivery position with its open thread guide eyelet. If two sub-elements of the elongate element are arranged one on top of the other, the bracket height of the swivel bracket must be greater, but the bracket length is shorter in such a case, so that the stability is higher and the tendency to be susceptible to vibrations is lower.

The longitudinal bar is spatially fixed with respect to its associated elongate element and preferably arranged analogously to the exemplary embodiment with the weft thread color selection device in the form of the color disc in the weft thread feed direction before or after the elongate element or at its height. Preferably the longitudinal bar is located as close as possible to the elongate member, preferably in sliding contact. "Upon its height" means that the elongate element is slidably arranged on the longitudinal bar or close to it, so that its movement takes place until the thread guide eyelet, from which the weft thread is to be inserted, is brought to the slit, i.e. to the reaching position.

Preferably, the delivery needle has a depression in its front region, also in the manner of an open eyelet. This lowering prevents lateral loss of the weft thread to be transported to the gripper by means of the delivery needle while the weft thread is being passed to the gripper. It is understood that the delivery needle in its design with a drop is applicable for a color wheel as well as for an elongate element with the corresponding open thread guide eyelet.

For a double weft insertion, the handing needle preferably has an open double drop in the manner of a double fork. With such a double lowering, it is possible to feed two weft threads side by side to a gripper at the same time. The size of the double depression is preferably matched to the thread guide eyelet or to the distance between two adjacent thread guide eyelets in the elongate element or in the colored disc. In order to implement a double weft insertion, the slot for releasing the weft threads to be inserted both in the longitudinal tack and in the tack for a colored disc is designed with such a width that the weft threads provided for the double weft insertion are both guided out of their respective thread guide eyelets essentially simultaneously with the delivery needle and can be transferred to the gripper.

Preferably, for the delivery of weft threads to the gripper, a system with two delivery needles for inserting one weft thread each is also provided. This increases the flexibility of the weaving machine according to the invention with the weft thread color selection device, because this allows both the handing over of a single weft thread and the handing over of two weft threads, namely simultaneously to a gripper, without structural modifications.

According to a further exemplary embodiment of the invention, the delivery needle or the delivery needles have a built-in weft thread tension measuring sensor in their respective lowering, by means of which the weft thread tension can be measured in the presence of a weft thread in such a lowering and, in the sense of a weft thread monitor, the presence of a weft thread can be measured. This makes it possible to set a thread tension that is required or desired for optimization of the weaving process.

Figur 1

eine Schussfadenfarbwahleinrichtung in Form einer Farbscheibe, bei welcher die Fadenführungsöse mit einzubringendem Schussfaden in der Hinreichungsposition ist;

Figur 2

eine Schussfadenfarbwahleinrichtung mit der Farbscheibe gemäß Figur 1, bei welcher eine Hinreichungsnadel für einen Doppelschusseintrag ausgebildet ist;

Figur 3

eine Farbscheibe mit ringsegmentförmigem Riegel zum Verschließen und Sichern der offenen Fadenführungsösen für nicht zuzuführende Schussfäden mit einem Schussfaden in einer Übergabeposition zum Greifer;

Figur 4

eine dreidimensional dargestellte Schussfadenfarbwahleinrichtung in Form eines länglichen Elementes gemäß einem zweiten Ausführungsbeispiel der Erfindung;

Figur 5

die Schussfadenfarbwahleinrichtung in gegenüber Figur 4 geänderter dreidimensionaler Darstellung;

Figur 6

den Grundaufbau einer Teilfarbscheibe sowie das Prinzip der Schussfadenhinreichung mit erster und zweiter Teilfarbscheibe für Einfach- und für Doppelschusseintrag;

Figur 7

eine Schussfadenfarbwahleinrichtung im Grundaufbau gemäß Figur 1, jedoch nach einem Ausführungsbeispiel mit erster und zweiter Teilfarbscheibe;

Figur 8

das Bespiel gemäß Figur 7 in vergrößerter Darstellung im Moment des Hinreichens des Schussfadens zum Greifer;

Figur 9

das Ausführungsbeispiel gemäß den Figuren 7 und 8 in dreidimensionaler Darstellung mit seitlicher Blickrichtung;

Figur 10

ein Ausführungsbeispiel gemäß Figur 7, jedoch für Doppelschusseintrag;

Figur 11

das Ausführungsbeispiel gemäß Figur 7 mit Blickrichtung von hinten auf den Riegel mit durch die Hinreichungsnadel ergriffenen Schussfaden;

Figur 12

ein weiteres Ausführungsbeispiel mit zwei Teilfarbscheiben, welche in derselben Schwenkebene angeordnet sind;

Figur 13

das Ausführungsbeispiel gemäß Figur 11, jedoch für Doppelschusseintrag;

Figur 14

ein Ausführungsbeispiel gemäß Figur 7 für Einzelschusseintrag aus einer Fadenführungsöse in der zweiten Teilfarbscheibe; und

Figur 15

ein Ausführungsbeispiel analog zu Figur 14, jedoch für Doppelschusseintrag.

Further advantages, details of the embodiment of the invention and possible applications will now become clear with regard to the accompanying drawings. Show in the drawing:

figure 1

a weft thread color selection device in the form of a color disc, in which the thread guide eyelet is in the handing-over position with the weft thread to be inserted;

figure 2

a weft thread color selector with the color disc according to figure 1 wherein a handing needle is configured for double pick insertion;

figure 3

a colored disc with a ring-segment-shaped bar for closing and securing the open thread guide eyelets for weft threads that are not to be fed in with a weft thread in a transfer position to the gripper;

figure 4

a three-dimensional weft thread color selection device in the form of an elongate element according to a second embodiment of the invention;

figure 5

the weft thread color selector in opposite figure 4 changed three-dimensional representation;

figure 6

the basic structure of a partial color disk and the principle of weft thread presentation with a first and second partial color disk for single and double weft insertion;

figure 7

a weft thread color selection device in the basic structure according to figure 1 , but according to an embodiment with a first and second partial color wheel;

figure 8

the example according to figure 7 in an enlarged view at the moment of reaching the weft thread to the rapier;

figure 9

the embodiment according to figures 7 and 8th in a three-dimensional view with a side view;

figure 10

an embodiment according to figure 7 , but for double weft insertion;

figure 11

the embodiment according to figure 7 looking from behind at the bartack with the weft thread caught by the handing needle;

figure 12

another embodiment with two partial color discs, which are arranged in the same pivot plane;

figure 13

the embodiment according to figure 11 , but for double weft insertion;

figure 14

an embodiment according to figure 7 for single weft insertion from a thread guide eyelet in the second partial color wheel; and

figure 15

an embodiment analogous to figure 14 , but for double weft entry.

figure 1 shows a fabric section with a shed 11 stretched out, in which a weft thread color selection device 1 according to the invention in the form of a color wheel 14 according to a first exemplary embodiment of the invention is shown on the side. The color disc 14 represents the actual thread guide 4 and has thread guide eyelets 6 for weft threads on its outer circumference, which are fed to the weft thread color selection device 1 by a prewinding device (not shown). Usually there is a weft thread 2 in each thread guide eyelet 6 . The thread guide eyelets are lowered from the outer edge or the outside 13 or the opening of the thread guide eyelet 6 into the colored disc 14 .

The weft thread color selection device 1 also has a delivery needle 12, which has a lowering 21 at its front end, which is designed like a fork, so that between the tines of the fork of the front end of the delivery needle 12, the weft thread 2 as soon as the color disk 14 is in the delivery position 10, by moving the handing needle 12 downwards towards a gripper 3, is fed to the gripper 3 in which it is clamped. In the usual way, the weft thread is held in a catch bar at a fabric edge until it comes back to the template.

The gripper 3, which clamps the weft thread 2 to be introduced into the shed 11, is guided on a gripper guide rail 26 and, after the weft thread 2 has been clamped, takes the weft thread with it as it moves through the shed 11, so that it is inserted into the shed 11. A movement of the sley, which is not shown here, causes the weft thread 2 to be beaten up at the binding point and thus tied off in the fabric and the edge or catch bar. The weft thread 2 is tied off in the fabric 24 by reading in the new binding-dependent opening of the woven shed 11 that follows.

The colored disc 14 has a first drive 8, by means of which the respective thread guide eyelet 6 is rotated into the handing-over position 10, so that after the colored wheel 14 has been moved from a non-handing position (not shown) with respect to the weft thread to be inserted, the handing needle 12 and its fork-shaped end can ) in a handing position 10 by lowering the handing needle 12, the weft thread 2 is guided out of the thread guide eyelet 6 without deflection and transferred to the gripper 3 for clamping the same. After clamping, the renewed Shot insertion realized. The passing needle 12 is moved by means of a second drive 9.

The number of different colors or different materials that can be used for the weft threads is defined by the number of thread guide eyelets 6 in the color selection disc 14.

In this exemplary embodiment, the weft thread color selection device is designed as a double arrangement of two disc segments. The disc segment arranged at the front in the feeding direction of the weft thread represents a bolt 16, which serves to close the open thread guide eyelets of the disc segment 14 arranged at the rear in the feeding direction of the weft thread, the weft threads of which are not to be inserted into the shed. The front disk segment designed as a latch 16 has a fixed position, whereas the disk segment 14 designed with the open thread guide eyelets can be rotated relative to the latch 16 . At least one weft thread is guided in each thread guide eyelet. The disk segment in the form of the color disk 14 provided with the thread guide eyelets 6 is now rotated in such a way that that thread guide eyelet 6, from which a defined or selected weft thread 2 is to be transferred to the gripper 3, has a slot 15 (see figure 3 ) is brought into agreement so that the weft thread to be fed can be fed from the thread guide eyelet 6 to the gripper 3 without being deflected. The thread guide eyelets which are not in the handing over position 10 are closed by the latch 16 in order to prevent the weft threads held in front from falling out unintentionally or unintentionally. The front disk segment provided with the slot 15 and designed as a latch 16 has a longitudinal slot 20 running parallel to the outer circumference of this disk segment, which slot 15 is formed by an opening. The weft thread can only be fed to the gripper 3 by means of the delivery needle 12 without being deflected if the slot 15 matches a defined thread guide eyelet from which a corresponding weft thread is to be fed to a gripper. The slot 15 in the forward disc segment is formed radially to its outer periphery. The disk segment designed as a bolt 16 is preferably arranged close to the colored disk 14, preferably even touching it.

When the weft thread 2 is in its delivery position 10 and ready for the delivery needle 12 to transfer it to the gripper 3, by lowering the handing needle 12 the weft thread 2 is led out of the outwardly open thread guide eyelet 6 through the slot 15 in the bar 16 and has no deflection whatsoever at any edge with regard to the direct color wheel 14, so that the weft thread 2 is not injured or damaged on the outside.

In figure 2 an arrangement of a weft thread color selection device 1 is shown in the form of a color wheel 14, which basically according to the illustration figure 1 corresponds, in which, however, the delivery needle 12 has at its front end for the simultaneous gripping of two weft threads for a double weft insertion two depressions in the sense of a double depression 22, in each of which a weft thread 2 is located. The spacing of the depressions 21 in the front end of the passing needle 12 essentially corresponds to the spacing of the open thread guide eyelets 6 in the color disc 14, so that when the handing needle 12 moves downwards, two weft threads 2 are guided out of their respective thread guide eyelets 6 and together with the Gripper 3 are supplied for the double weft insertion. The fabric 24 shown shows a finished piece of fabric with a cut edge or laid-in edge 25 and a shed 11 stretched out from the binding point of the fabric in the right direction of the drawing.

In figure 3 a double arrangement of disc-segment-like color disc 14 and also disc-segment-like bolt 16 is shown. In figure 3 is in the weft thread insertion direction of the bar 16 lying at the front in the double arrangement of the two disk segments, followed by the color disk 14 having the thread guide eyelets 6 . The disk segment-like bolt 16 has a longitudinal slot 20 running in its circular circumferential direction parallel to the circumference, which represents a slot 15 in the sense of a breakthrough through the outer ring-shaped web of the bolt 16 that results. The locking bar 16 is in a fixed position, with its slot 15 being arranged in such a way that a weft thread guided out through this slot from an open thread guide eyelet 6 of the colored disc 14 can be fed to a gripper. In figure 3 is now shown that a weft thread within the longitudinal slot 20 following the circumferential contour in the bar 16 is secured against unintentionally falling out, that on the other hand a weft thread 2 intended for insertion into a shed 11 has already passed through the slot 15 and thus also from the corresponding slot with the slot in Match brought guide eyelet 6 has been brought out, with the help of the handing needle 12, which has a corresponding fork-shaped depression in its front end, the gripper 3 has been fed to the terminals. The position in which the handing needle has brought the weft thread fed to the gripper 3 is referred to as the transfer position. In the figure 3 The weft thread situation shown is therefore the one that has arisen after the color disc 14 with its thread guide eyelet 6, from which a corresponding weft thread 2 is to be fed to the gripper 3, has been brought into alignment with the slot 15 of the bar 16 and by means of the delivery needle 12 this weft thread has been brought out of the open thread guide eyelet 6 through the slot 15 into the transfer position, which in figure 3 is shown. In the transfer position, a clamping device on the gripper 3 grips this weft thread and then inserts the weft thread into the shed.

In figure 4 a second exemplary embodiment according to the invention is shown, in which the weft thread color selection device 1 is designed as an elongate element 17 in which thread guide eyelets 6 arranged side by side downwards in the direction of the fabric 24 are provided. The thread guide 4 embodied as an elongate element 17 is displaced by means of a first drive 8 in such a way that the weft threads 2 arranged in the respective thread guide eyelets 6, which are open towards the underside, are moved in the longitudinal direction by means of the first drive 8 from a non-reach position (not shown) into a reach position 10 to be brought. The second thread guide 4 embodied as an elongate element 17a, which is at the front in the direction of weft thread insertion, can even have closed thread guide eyelets without there being a strong deflection between the two elongate elements 17, 17a of the weft thread 2 arranged one behind the other. The delivery needle 12 has a depression 21 at its front end.

In figure 4 It can be clearly seen that the longitudinal bar 18 is arranged between the thread guide 4 having closed eyelets and the elongate element 17 having open eyelets. Only two weft threads are shown as an example. According to the representation figure 4 The right weft thread is now aligned by means of the thread guide 4 in such a way that the weft thread 2 is exactly in the position of the fixed longitudinal bar 18, in which the thread guide eyelet 6 of the elongated element 17 is aligned with the slot 15 in the longitudinal bar 18, so that the weft thread then by means of the pivot bracket 19 and the corresponding lowering 21, which is located on the front area of the delivery needle designed as a pivot bracket 19, can be guided out of the thread guide eyelet 6 from exactly this delivery position 10 into the transfer position to the gripper 3. the inside figure 4 The weft thread arranged on the left, on the other hand, is arranged outside of the slot 15 in the longitudinal bar 18 and can therefore not be guided out of the corresponding thread guide eyelet without being deflected. In any case, it is always the longitudinal bar 18 which closes the open thread guide eyelets, which applies to all those weft threads or weft thread guide eyelets with weft threads correspondingly received therein which are not intended for weft insertion.

A delivery needle 12 designed as a swivel bracket 19 with a second drive 9 grips over the gripper 3 together with its gripper guide rail 26 and guides the weft thread 2 to be inserted into the shed 11 out of the thread guide eyelet 6, which is open at the bottom, and guides it without deflection to the gripper 3, which guides it clamps and then enters the shed 11. the inside figure 4 in the insertion direction for the weft thread at the front, i.e. the first arranged thread guide 4 or the elongate element 17a with its closed eyelets is moved with a first drive 8 also arranged there essentially synchronously with the movement of the actual thread guide 4 or elongate element 17, so that additional deflections of the weft thread 2 on the way to the gripper 3 are avoided.

figure 5 shows the weft thread color selection device 1 in a opposite figure 4 changed three-dimensional representation, whereby the direction of view of the representation is not so much from above as in figure 4 is the case, but is shown more from the side of the fabric. This has the advantage that the spatial arrangement of the various assemblies, such as the elongated element 17, 17a with thread guide eyelets 6, first drives 8 for the thread guides 4 and a second drive 9 for the pivot bracket 19, are shown better. In figure 5 it is shown that the swivel bar 19 has just guided the weft thread 2 out of the thread guide eyelet in the elongate element 17, which is open to the outside. For the sake of clarity, the slot 15 in the longitudinal bar 18 is shown in FIG figure 5 not visible.

To both the first embodiment according to the figures 1 and 2 and 3 and the second embodiment according to the figures 4 and 5 In order to achieve optimal weaving conditions, it is also provided that a weft thread tension measuring sensor 23 (see figure 3 ) is arranged, which emits information or a signal on the prevailing thread tension. It can thus be ensured that the thread tension can be kept essentially constant or at a correspondingly desired value during the entire weaving process, which guarantees optimal weaving conditions.

After the weft thread 2 has been transferred to the gripper 3, the swivel bracket 19 and the delivery needle 12 are returned to their respective starting positions.

In figure 6 the basic structure of a first partial color disk for the exemplary embodiment with two partial color disks arranged in parallel planes to one another, a first partial color disk 14.1 and a second partial color disk 14.2, is shown. In Figure 6a ) It is shown that the first partial color disk 14.1 according to the invention has thread guide eyelets 6.1 open to the outside 13. Parallel to the curvature of the outer contour of the partial color disk 14.1, offset inwards with the same curvature, runs a longitudinal slot 20.1, which is used for guiding weft threads 2 to that according to Figure 6b ) arranged second partial color disk 14.2 is provided to prevent the thread guide eyelets 6.2 that are open to the outside from unintentionally losing the weft threads that are fed in and guided there in the thread guide eyelets 6.2. This curved longitudinal slot 20.1 has a passage 15.1, which establishes a connection from the longitudinal slot 20.1 to the outside of the first partial color disc 14.1.

In the following Figures 6b) to 6f ) to be registered weft threads 2 for the sake of clarity of the illustration with small numbers in the open thread guide eyes 6.1. and 6.2.

In Figure 6b ) shows the double arrangement of the first and second partial color disks 14.1, 14.2. In addition, the delivery needle 12 is located to correspond to the Figures 6b) and 6c ) to show the supply of a weft thread from a thread guide eyelet 6.1 of the first partial color disk 14.1 on the one hand and a weft thread 2 from a thread guide eyelet 6.2 of the second partial color disk 14.2 on the other hand. Both partial color disks 14.1 and 14.2 can be swiveled independently of one another, so that greater flexibility and a larger number of weft threads are made possible while the threading density of the thread guide eyelets 6.1, 6.2 is maintained. In Figure 6b ) shows how a weft thread 2 with the number 5 is to be taken from a thread guide eyelet 6.1 of the first partial color disk 14.1 by the reaching needle 12 and fed to the gripper.

In Figure 6c ) shows how a weft thread with the number 9 is to be fed from the weft thread guide eyelet 6.2 of the second partial color wheel 14.2 via the passage 15.1 to a gripper 3 after the weft thread has been gripped by the delivery needle 12.

Figure 6d ) shows how two weft threads, which are denoted by the numbers 2 and 3, can be grasped from the thread guide eyelets 6.1 of the first partial color disk 14.1 by means of the handing needle 12 and fed to the gripper 3 by means of a handing needle 12 for a double weft insertion. The second partial color disk 14.2 is not in action because it has been pivoted to the side.

In Figure 6e ) it is shown that the arrangement of a double partial color disc 14.1, 14.2 with double weft insertion has another special feature, namely that adjacent thread guide eyelets 6.2 in the second partial color disc 14.2 must be left empty (designated with an x) if a combination of weft threads is to be inserted which a weft thread, here the number 4, from a thread guide eyelet 6.1 of the first partial color disc 14.1 and a weft thread, here the number 11, from a thread guide eyelet 6.2 of the second partial color disc 14.2 are to be fed to a gripper 3 in the sense of a double weft insertion.

A similar example is in Figure 6f ) is shown, with a weft thread numbered 4 from a thread guide eyelet 6.1 of the first partial color disk 14.1 and a weft thread numbered 9 from the second partial color disk 14.2 by means of the delivery needle 12 for a double weft insertion to a gripper 3. The feed to the gripper 3 is for the sake of simplicity in the Figures 6b) to 6f ) Not shown.

The embodiment with two partial color discs 14.1 and 14.2 arranged in parallel planes to one another offers advantages in terms of a larger number of colors with the same lateral spacing of the thread guide eyes 6.1, 6.2, i.e. with a constant line-up density. Alternatively, it is also possible to increase the lateral distance between the eyelets and retain the same number of different weft threads. Overall, there are more possible combinations for a double weft insertion. In principle, the arrangement of two partial color disks 14.1, 14.2 offers the possibility of even retrofitting existing systems, which previously only worked with one color disk, in order to provide a larger number of colors or types for weft threads.

figure 7 shows a basic arrangement of a weft thread color selection device 1, the basic structure accordingly figure 1 corresponds, in which, however, according to the second aspect of the invention, two partial color disks 14.1, 14.2 are arranged in planes parallel to one another and one behind the other in the weft thread insertion direction. The essential basic structure corresponds to that of figure 1 , so that the same components have the same reference numerals and the basic basic structure is not explained in detail again here. Visible in figure 7 is that the first partial color disk 14.1 and the second partial color disk 14.2 are arranged on a bolt 16 by means of a common pivot point or a common pivot axis. Both partial color disks have on their outer side 13 open thread guide eyelets 6.1, 6.2, in which weft threads are guided and from there are fed by means of a delivery needle 12 to a gripper 3, which is guided on a gripper guide rail 26. As soon as the weft thread 2 passed to the gripper has been clamped by the gripper, the weft thread is inserted into the shed 11.

Examples are in figure 7 drawn three held weft threads, with two weft threads are guided in thread guide eyelets 6.1 of the first partial color disc 14.1, whereas in the second partial color disc 14.2 a weft thread is guided in a thread guide eyelet 6.2. Two longitudinal slots 20 are provided in the bolt 16 and extend parallel to the outer circumference of the bolt 16 . In the insertion direction of the weft thread, the passing needle 12 is arranged after both partial color disks 14.1, 14.2, in such a way that the forwarding needle 12 is arranged in the area of the pivot axis of both partial color disks 14.1, 14.2 and such an alignment in its movement for grasping a weft thread and guiding it out allows the outwardly open and released thread guide eyelet 6.1 of the respective partial color disk to the gripper.

The two first drives 8.1 and 8.2 for the first partial color disk 14.1 and the second partial color disk 14.2 are shown in a schematic representation, which drive the two partial color disks independently of one another, so that the partial color disks 14.1 and 14.2 can be pivoted relative to one another. By pivoting against each other, it is achieved that the segment angle of the first partial color disc 14.1 does not have to be larger if the number of weft threads should increase. For this purpose, the partial color wheel 14.2 arranged parallel to it is provided, which also has thread guide eyelets 6.2 open to the outside. The weft threads, which are guided in the thread guide eyelets 6.2 of the second partial color disc 14.2, could in principle slip out of the outwardly open thread guide eyelets 6.2. To prevent this, there is a longitudinal slit 20.1 in the first partial color disk 14.1, which extends parallel to the curvature of the outside of the first partial color disk 14.1 inside the partial color disk and guides the weft threads for the second partial color disk 14.2. Not evident from figure 7 Because covered by the second partial color disk 14.2, there is a passage 15.1 from the longitudinal slot 20.1 in the first partial color disk 14.1 outwards to its outer side 13. In a pivoting state in which the weft thread to be fed to the second partial color disk 14.2 is pivoted with respect to the first partial color disk 14.1 in such a way that the sufficient weft thread or the thread guide eyelet 6.2 carrying this weft thread is brought into alignment with the passage 15.1, the delivery needle 12 has brought the weft thread out of the thread guide eyelet 6.2 of the second partial color disk 14.2 through the outer region of the first partial color disk 14.1 and fed it to the gripper 3. Since the delivery needle 12 has a separate second drive 9, a total of three drive motors 8.1, 8.2 and 9 to be controlled and operated independently of one another are provided.

The provision of two partial color disks 14.1, 14.2, which can be moved parallel to one another and independently of one another, increases the flexibility of the weft threads to be inserted, including the number of preferably different weft threads that can be reached.

figure 8 shows the basic arrangement of the weft thread color selection device 1 according to FIG figure 7 , but in an enlarged partial view. The partial color disk 14.1 with the thread guide eyelets 6.1 open to the outside and the longitudinal slot 20.1, which extends behind the open thread guide eyelets 6.1 as a curved slot arrangement when viewed from the outside 13, is clearly visible. As an example, two weft threads 2 are shown, which are guided in two adjacent thread guide eyelets 6.1, the ends of which have just been tied into the fabric. Another weft thread 2 is just being gripped by the delivery needle 12 in order to be guided to the clamping device of the gripper 3 so that the latter can then insert this weft thread into the shed 11 . This third weft thread shown has been guided in a thread guide eyelet 6.2 of the second partial color disk 14.2 and has already been guided out of this through the delivery needle 12, namely from the outwardly open thread guide eyelet 6.2 through the passage (not shown) from the longitudinal slot 20.1 in the first partial color disk 14.1.

In a slightly different, also perspective view, in figure 9 the formation of the weft thread color selection device 1 in three-dimensional representation according to the figure 8 shown, but in a viewing direction opposite to the weft insertion direction. For the sake of simplicity of the illustration, only the first drive 8.1 for the first partial color disk 14.1 and the first drive 8.2 for the second partial color disk 14.2 are shown. The longitudinal slot 20.1 for guiding the weft threads is shown in the first partial color disk 14.1, which are led to the entry into the shed via the second partial color disk 14.2. The delivery needle 12 is not yet in a position in which the weft thread 2 can be gripped and guided out of the thread guide eyelet 6.2 of the second partial color disc 14.2. Before this weft thread is guided out of the second partial color disc 14.2 by means of the delivery needle 12, the second partial color disc 14.2 must first be pivoted upwards to the right in the direction of view of this partial color disc 14.2 until the thread guide eyelet 6.2 guiding this weft thread is congruent with the passage 15.1 in the first partial color disk 14.1, so that this weft thread from the second partial color disk 14.2 can then be guided outwards, so to speak, through the first partial color disk 14.1 by means of the delivery needle 12.

In figure 10 1 is a basic structure of the weft thread color selection device 1 according to FIG figure 7 shown, the only difference to this basic structure according to figure 7 is that the handing needle 12 is intended for double pick insertion. For this purpose, the delivery needle 12 has double depressions in the head of the delivery needle 12 at its front end, by means of which the weft threads can be gripped and fed to the gripper 3 from the thread guide eyes 6.1, which are open on the outside. In the present example according to figure 10 two weft threads in the first partial color disc 14.1 are guided in adjacent thread guide eyelets 6.1 and are ready to be fed to the gripper 3 by means of the reaching needle 12 provided for double weft insertion, after the first partial color disc 14.1 has been pivoted far enough in relation to the bar 16 that the passage of the Longitudinal slot 20 in the bolt 16 releases the two thread guide eyelets 6.1 to the outside.

The three required drives for the weft thread color selection device 1 according to the invention can be clearly seen, namely the drive 9 for the passing needle 12, the drive 8.1 for the first partial color disc 14.1 and the drive 8.2 for the second partial color disc 14.2, which three drives are independent of one another for driving the respective elements are provided.

In the figure 10 The representation shown is viewed from behind onto the weft thread color selection device 1, ie in the direction of weft insertion, in figure 11 shown. The bar 16, which is fixed, has two longitudinal slots 20 running concentrically to one another and to the outer circumference, which each have an opening via a slot 15 for leading out the weft threads guided in the longitudinal slots 20 to the outside, so that the weft threads ultimately come out of the to the outside open thread guide eyelets 6.1, 6.2 can be guided out by means of the delivery needle 12 and fed to the gripper 3, which is an example for one of the three weft threads shown in figure 11 is shown. This weft thread, which has just been transferred from the delivery needle 12 to the clamp of the gripper 3, has already been guided out of the longitudinal slot 20 via the slot 15 from its guide and thus also out of the corresponding thread guide eyelet 6.1 of the relevant partial color disk 14.1. The first partial color disk 14.1 and the second partial color disk 14.2 are again shown, the latter being only partially recognizable due to the viewing direction. The ones in the upper part of figure 11 The dashed line shown represents the pivot axis about which the first and second partial color discs 14.1, 14.2 can be pivoted relative and independently of one another, with the bolt 16 not being able to be pivoted as well, but occupying a spatially fixed position.

According to a further embodiment, which is figure 12 is shown, a first partial color disk 14.1 and a second partial color disk 14.2 are again shown, but which differ from the exemplary embodiment according to FIG Figures 7 to 11 are not arranged in different parallel planes to one another in the weft insertion direction, but which are both arranged in one plane. The partial color disk 14.1 and the partial color disk 14.2 have a common pivot point in relation to the bolt 16 and are articulated on it. They can be pivoted independently of each other. This means that the first partial color disk 14.1 with its thread guide eyelets 6.1 has a first drive 8.1 and the second partial color disk 14.2 with its thread guide eyelets 6.2 has a first drive 8.2, whereas a further drive 9 is provided for driving the handing needle 12. Each of the two partial color disks 14.1 and 14.2 can assume an operating position or a parking position. In the present case, each partial color disc 14.1, 14.2 has four thread guide eyelets 6.1, 6.2, so that this is equivalent to a single color selection disc with eight thread guide eyelets when pivoting together is coordinated. In principle, this division of color selection disks in one plane is advantageous if, for example, certain weft threads are used more often than others during a weaving period, whereas individual or other weft threads that are guided in the other partial color disk are only used occasionally. In such a case, in order to reduce the path of movement of the partial color disk, the partial color disk whose weft threads are not currently needed can be folded away from its operating position into a parking position. In this way, the path of movement and thus the time for preparing the respective weft threads can be reduced. Otherwise, the rest of the structure is identical to that described in the earlier exemplary embodiments.

In figure 13 is the closed figure 11 shown analogous view, in which only the handing needle 12 is provided for handing over two weft threads at the same time, ie for a double weft insertion. All other functions and structural features are identical to those described above and are therefore not explained further here.

In figure 14 an illustration is shown in which two weft threads are provided by the weft thread color selection device 1, so to speak, but only a single weft thread is to be inserted with the handing-in needle 12 or the gripper 3 is to be fed by means of the handing-in needle 12. For this purpose, the second partial color disk 14.2 is brought into a position in which it is in line with the passage 15.1, so that this weft thread can also be led out of the first partial color disk 14.1 through the passing needle 12 from the longitudinal slot 20.1 in the first partial color disk 14.1 via the passage 15.1 and can be fed and transferred to the gripper 3 for gripping and insertion into a shed 11.

Finally is in figure 15 a basic structure as shown in figure 13 for a double weft insertion, in which it is shown how the reaching needle 12 grabs two weft threads straight out of the respective thread guide eyes 6.1, 6.2 for the double weft insertion in order to lead them out of the thread guide eyes. One weft thread is guided by the first partial color disc 14.1, while the second weft thread is guided by the second partial color disc 14.2, whose thread guide eyelet 6.2 guiding it has just been made congruent with the passage 15.1. The second partial color wheel 14.2 has been pivoted in relation to the first 14.1 into the position that the corresponding thread guide eyelet 6.2 coincides with the passage 15.1. The rest of the function and the rest of the structure correspond to what has already been described.

Reference List

1

Weft thread color selector

2

weft thread

3

gripper

4

thread guide

6

thread guide eyelet

6.1

Thread guide eyelet for the first partial color wheel

6.2

Thread guide eyelet second partial color disc

8th

first drive

8.1

first drive first partial color wheel

8.2

first drive second partial color wheel

9

second drive

10

handover position

11

shed

12

handing pin

13

outside

14

Color disc/disc segment

14.1

first partial color disc

14.2

second partial color disk

15

slot

15.1

Passage of the first partial color disk

16

bars

17

elongated element

17a

elongated element

18

longitudinal bars

19

swivel bracket

20

Longitudinal slot latch

20.1

Longitudinal slot of the first partial color wheel

21

Lowering the handover needle

22

double lowering

23

Weft thread tension measuring sensor

24

tissue

25

Inlay edge/cut edge

26

gripper guide rail

Claims (20)

1. Weaving machine having a weft thread colour selection device (1) from which individual weft threads of a number of provided weft threads (2) are able to be supplied to a gripper (3) in a selected sequence, and which has a thread guide (4) by means of which the weft threads supplied from a weft thread prewinding device are able to be supplied to the weft thread colour selection device (1) by way of the thread guide (4), the thread guide eyelets (6, 6.1, 6.2) of said weft thread colour selection device (1) by way of the first drive (8) of the latter being able to be moved to a respective feeding position (10) and each one receiving at least one weft thread (2) in order for the latter to be selected and provided to the gripper (3) for weft insertion into a weaving shed (11), and the fed weft thread by means of a feeding needle (12) driven by a second drive (9) being able to be supplied to the gripper (3) in the feeding position (10), characterized in that each thread guide eyelet (6, 6.1, 6.2) of the weft thread colour selection device (1), at least in the feeding position (10) thereof, is open towards the external side (13) by way of which the respective selected weft thread is able to be fed to the gripper (3) and able to be transferred to the latter by means of the feeding needle (12), wherein the feeding needle by way of the open external side (13) of the thread guide eyelet (6, 6.1, 6.2) guides the weft thread in a deflection-free manner out of the thread guide eyelet (6, 6.1, 6.2).
2. Weaving machine according to Claim 1, characterized in that the weft thread colour selection device (1) has a colour disc (14), the thread guide eyelets (6, 6.1, 6.2) thereof being disposed in the region of the external circumference of said colour disc (14) and each one having one opening that runs radially toward the external side (13).
3. Weaving machine according to Claim 1 or 2, characterized in that the feeding needle (12) with regard to the colour disc (14) transfers the weft thread (2) to the gripper (3) by way of at least one directional component that runs in the radial direction to the colour disc (14).
4. Weaving machine according to Claim 2 or 3, characterized in that the thread guide eyelets (6, 6.1, 6.2) that are not situated in the feeding position (10) thereof are able to be closed by means of a latch (16) which for securing the respective weft thread (2) in the respective thread guide eyelet (6, 6.1, 6.2) has a latch (16) comprising a slot (15) to be closed, wherein the colour disc (14) by means of the first drive (8) is rotatable in relation to the latch (16) in such a manner that the slot (15) always releases only that thread guide eyelet (6, 6.1, 6.2) from which the weft thread (2) is to be transferred from the feeding position (10) to the gripper (3).
5. Weaving machine according to one of Claims 2 to 4, characterized in that the colour disc (14) is configured in at least two parts and has a first colour sub-disc (14.1) and a second colour sub-disc (14.2) which are driven in a mutually independent manner by means of controllable drives (8.1, 8.2) and have thread guide eyelets (6, 6.1, 6.2) each one being open towards the external side.
6. Weaving machine according to Claim 5, characterized in that the second colour sub-disc (14.2) in the weft thread insertion direction is disposed in a plane parallel to the first colour sub-disc (14.1).
7. Weaving machine according to Claim 5 or 6, characterized in that the first colour sub-disc (14.1) has a longitudinal slot (20.1) which is configured so as to be parallel to the curvature of the external circumference of said first colour sub-disc (14.1) and in the first colour sub-disc (14.1) has a passage (15.1) that penetrates the external circumference of the latter such that a weft thread (2) guided in the longitudinal slot (20.1) by way of the feeding needle (12) is able to be supplied to the gripper (3) via the passage (15.1).
8. Weaving machine according to Claim 7, characterized in that the passage (15.1) is disposed so as to be centric in the first colour sub-disc (14.1).
9. Weaving machine according to Claim 7 or 8, characterized in that the first colour sub-disc (14.1) and the second colour sub-disc (14.2) are driven so as to be mutually pivotable in such a manner that, for supplying a weft thread (2) from a thread guide eyelet (6.2) in the second colour sub-disc (14.2), this thread guide eyelet (6.2) can be brought to be congruent with the passage (15.1) and by means of the feeding needle (12) is able to be supplied from the second colour sub-disc (14.2) to the gripper (3) via the first colour sub-disc (14.1).
10. Weaving machine according to one of Claims 5 to 9, characterized in that, for a double weft insertion in which a first weft thread by means of the feeding needle (12) is acquired from a thread guide eyelet (6.1) of the first colour sub-disc (14.1) and a second weft thread by means of the feeding needle (12) is acquired from a thread guide eyelet (6.2) of the second colour sub-disc (14.2) and said weft threads are supplied to the gripper (3), no weft thread is situated in the thread guide eyelet (6.2) that is disposed so as to be adjacent to that thread guide eyelet (6.2) that guides the second weft thread.
11. Weaving machine according to Claim 5, characterized in that the first colour sub-disc (14.1) and the second colour sub-disc (14.2) are disposed in one plane and each one being pivotable from an operating position in which weft threads are able to be fed to the gripper (3) to a parking position in which no weft threads (2) are fed to the gripper (3).
12. Weaving machine according to Claim 1, characterized in that the weft thread colour selection device (1) is configured as at least one elongate element (17) in which thread guide eyelets (6) thereof each one guiding one weft thread (2) are disposed next to one another and are open by way of the external side (13) that faces the gripper (3).
13. Weaving machine according to Claim 12, characterized in that the elongate element (17) by means of the first drive (8) in the form of at least one linear motor is displaceable in terms of the longitudinal extension of said elongate element in such a manner that the thread guide eyelet (6) that guides the weft thread (2) to be currently transferred to the gripper (3) is moved to the feeding position (10) of said thread guide eyelet (6).
14. Weaving machine according to Claim 12 or 13, characterized in that the thread guide eyelets (6) that are not situated in the feeding position (10) thereof are - for securing the respective weft thread (2) in the respective thread guide eyelet (6)- able to be closed by means of a longitudinal latch (18) comprising a slot (15), wherein the elongate element (17) is displaceable in relation to the longitudinal latch (18) in such a manner that only the thread guide eyelet (6) is open that in the selected feeding position (10) is situated on the slot (15).
15. Weaving machine according to one of Claims 12 to 14, characterized in that the elongate element (17) is composed of two separate parts which for the displacement thereof each one having one linear motor.
16. Weaving machine according to one of Claims 12 to 15, characterized in that the feeding needle is configured as a pivoting bracket (19), has a drive for pivoting the pivoting bracket from a non-feeding position via the feeding position (10) to a transfer position in which the selected weft thread is able to be transferred to the gripper, and the pivoting bracket (19) is configured having a bracket with such a height that the weft threads (2) held available for weft insertion in the elongate element (17) are overlapped in a noncontacting manner by the pivoting bracket (19).
17. Weaving machine according to one of Claims 1 to 16, characterized in that the feeding needle (12) has at least one depression (21) which prevents the weft thread (2) being laterally lost when the latter is fed to the gripper (3).
18. Weaving machine according to one of Claims 1 to 17, characterized in that the feeding needle (12) for double weft insertion has a double depression (22) in the manner of a double fork.
19. Weaving machine according to one of Claims 1 to 17, characterized in that two feeding needles (12) are provided for inserting one weft thread (2) each.
20. Weaving machine according to one of Claims 1 to 19, characterized in that the feeding needle (12) in the depression (21) thereof that supplies a respective weft thread (2) to the gripper (3) has a weft thread tension measuring sensor (23) by means of which the weft thread tension and, in the context of a weft thread monitor, the presence of a weft thread (2), is able to be detected.

Images