EP1499764A1

EP1499764A1 - Yarn feeding device

Info

Publication number: EP1499764A1
Application number: EP03727222A
Authority: EP
Inventors: Falk Kühn; Hermann Schmodde
Original assignee: Memminger IRO GmbH
Current assignee: Memminger IRO GmbH
Priority date: 2002-05-02
Filing date: 2003-04-25
Publication date: 2005-01-26
Anticipated expiration: 2023-04-25
Also published as: US20050126228A1; EP1499764B1; CN1650058A; US7261251B2; TW200403368A; KR100638508B1; DE50301864D1; BR0309352B1; BR0309352A; DE10219537A1; TWI229157B; KR20050006189A; CN100359069C; DE10219537B4; JP2005532481A; WO2003093549A1; AU2003233766A1

Abstract

A yarn lifting element (28), which is provided on a positive thread regulating wheel, comprises straight yarn-bearing surfaces (34,35) whose position cannot be displaced by the yarn (2), enabling the yarn to slip in relation to the thread feeding wheel (17) when required. Said additional measure enables the positive thread regulating wheel to be used in areas which were previously excluded on account of the required synchronicity between the feeding of the thread and the consumption of the thread.

Description

Fadenliefercrerät

The invention relates to a thread delivery device for supplying a thread to a thread consumption point, such as the knitting point of a knitting machine.

Thread delivery devices are used to pull the thread from a thread supply, for example a yarn spool, and to deliver it to a thread-consuming device, for example with a predetermined thread speed or with a predetermined thread tension or according to other specifications. Such thread consuming devices can be the knitting points of knitting machines or other technical African facilities ^' . Elastic threads, inelastic threads made of natural fibers or synthetic fibers, staple yarns, other yarns or monofilaments can be considered as threads. Often the thread consumption point does not have a constant thread consumption, so that the thread delivery has to be adapted to the thread consumption. This applies, for example, when the thread consumption point is switched on and off, for example in the case of ringing or jacquard machines. For this purpose, friction feeders have become known in which the thread loops around a rotatingly driven drum, but is lifted off the drum at one or more points. For example, a thread delivery device is known from ÜS-PS 2539527, the thread delivery wheel is formed by a drum cage rod cage. Two hook-shaped spiral springs are arranged in the vicinity thereof, which partially lift the single thread winding that wraps around the drum from the rod cage.

With different thread tensions, the wrap around the rod cage changes due to the deflection of the spiral springs.

From FR-PS 964455 another yarn delivery device is known which has a rotatingly driven yarn delivery drum. This is wrapped several times by a thread. The individual thread windings formed in this way also loop around two pivotably mounted pins which, depending on the pivot position, extend parallel to the thread feed drum or at an acute angle to it. The pins can pivot away from the drum, thus increasing the thread reserve if the subsequent knitting point does not take off any thread. Here too, the looping conditions change due to the movement of the pins.

A thread delivery device is also known from Sü-PS 785168, which has a rotationally driven cylindrical thread delivery drum and a thread lifting element assigned to it. The thread lifting element has a kinked thread support surface, the first section of which extends at an acute angle from 15 ° to 20 ° to the drum surface and the second section of which runs parallel to the drum surface. The lower end of the thread lifting element is bifurcated, with a machine stop lever reaching into the interstice space.

Because of the kink provided in the contact surface between its upper part and its lower part, the individual windings which wrap around the lifting element and the drum have different lengths. A large or small thread tension therefore does not easily continue evenly through all turns.

Frequently, there is also the desire that a thread delivery device can be operated in different operating modes. The aforementioned devices according to the prior art, however, are set up either as positive feeders with thread supply or friction feeders. It also shows that the existing devices must be matched to the thread to be supplied. This represents a significant limitation, which must primarily be remedied. Proceeding from this, it is an object of the invention to create a thread delivery device that can be used in a variety of ways.

This object is achieved with the thread delivery device according to claim 1. The thread delivery device has at least one thread contact surface in the vicinity of the thread delivery wheel, through which the windings spanning the thread delivery wheel can run. For this purpose, for example, a single thread lifting element is provided. Alternatively, two thread contact surfaces can be provided on two separate thread lifting elements. Both thread delivery devices, however, have in common the basic geometric design of the thread contact surface (s) of the thread lifting element and the design of the thread delivery wheel. The thread delivery device according to the invention can be used both as a positive feeder and as a friction feeder. The thread delivery wheel has a thread inlet area with a means which gives the thread winding a feed. This is achieved, for example, by designing the thread inlet area as a very steep cone, which merges smoothly into the storage area, which can be designed as a slender cone, for example. The thread windings picked up by the rotating thread delivery wheel thus squeeze between the inlet area and the storage area and thus shift the winding in the axial direction in order to make room for itself. This is particularly important for positive operation, in which the thread does not run over the thread lifting element. In order to perform friction operation, the thread lifting element enables a limited frictional engagement between the thread and the thread delivery wheel, so that the thread delivery device at a more or less constant speed of the thread delivery wheel can deliver fluctuating thread quantities. The feed of the thread roll on the thread delivery wheel can be supported by a taper of the storage area. In addition, an acute angle between the thread contact surface of the thread lifting element and the side of the thread feed wheel remote from the thread lifting element can cause a winding feed.

The feed means provided in the inlet area, which, as mentioned above, is preferably formed by the shape of the thread delivery wheel itself, can also be formed by other devices which move the thread winding in the axial direction. This can be, for example, a disk which is arranged in the thread feed wheel and which has spokes projecting outwards through openings in the thread feed wheel. When the axis of rotation of the disc is slightly inclined against the axis of rotation of the thread delivery wheel, the spokes of the disc push the winding axially forward on a thread delivery wheel side. In addition, the storage area can be formed by two cages running into one another at an acute angle, which cause a thread feed.

Regardless of the specific design of the feed means, the thread delivery device can be used with and without thread lifting element. If the thread lifting element is not used or even removed, the feed means causes an orderly winding to be formed. This can have ten to twenty turns without turns overlapping. In the case of friction operation, on the other hand, at least several turns of the thread winding are guided over the thread lifting element and its thread contact surface. The required winding feed comes here at least partially due to the interaction of the thread lifting element with the thread delivery wheel. The axial feed force acts on each individual turn, so that a relatively large winding with ten to twenty turns (eg fifteen turns) can be accommodated on the thread delivery wheel. Even with such large coils, friction operation is made possible and the overlapping of individual turns (which would lead to malfunctions) is avoided. The large thread wrap, some or all of which windings lead over the thread lifting element, ensures that the end of a thread does not run into the goods to be manufactured if a thread is interrupted. An inlet stop, which detects a thread interruption, switches off the downstream thread-consuming machine. The thread reserve on the thread delivery wheel is sufficient to supply the machine with thread while it is running out. This applies to both positive operation and friction operation. A new thread can thus be attached to the existing thread end, so that malfunctions can be remedied quickly and easily.

In a preferred embodiment of the invention, the thread delivery wheel is designed and the thread lifting element is arranged in such a way that each older turn in the winding that is being formed is somewhat shorter than the adjacent younger turn. Every single turn is therefore subject to the feed effect. Depending on the thread type and thickness, the winding length decrease can be adjusted by changing the inclined position of the thread lifting element. This can also be used to regulate the distances between the turns. The thread contact surface is preferably straight, that is to say it is designed to be free from bending and kinks. The thread cannot change the position of the thread lifting elements. This results in constant funding conditions. Furthermore, the thread-lifting element or elements are preferably arranged in such a way that less than 240 ° of each thread turn of the thread winding is in contact with the thread feed wheel (contact angle), ie a portion of each turn of more than 120 ° is lifted off the thread feed wheel. The entire winding lies against the thread delivery wheel with less than 2/3 the length of a completely fitting (cylindrical) winding. However, the contact angle is preferably greater than 180 °.

It turns out that the straight, i.e. Kink-free contact surface of the thread lifting element represents a good compromise for all threads to be conveyed and delivered, especially in connection with a thread delivery wheel, as is used by pure positive feeders. A drop in the thread output tension can occur temporarily, which continues due to the kink-free formation of the contact surfaces through all turns and leads to slippage. This prevents the thread turns from overlapping at low thread tension (loose turns).

It has also been shown that a particularly large spectrum of possible threads can be processed if the distance between the two contact surfaces is approximately 10 mm to 30 mm, preferably 12 mm to 18 mm. This is especially true in connection with thread delivery wheels, which are designed as rod cages or ribbed drums. The distance from the drum is preferably in the range between 10 mm and 20 mm. The thread lifting elements can be made of ceramic (wear resistance) or by wire pins or wire brackets (simple manufacture). In addition, the thread lifting element can be formed by a bent sheet metal part. If the thread lifting element is made of metal (wire or sheet metal), it is advantageous to provide a wear-reducing coating, such as ceramic.

In addition to the thread delivery wheel, the thread delivery device preferably has no other thread conveying means, such as belts or the like resting on the thread delivery wheel. The thread delivery wheel thus has a free outer circumference. This enables a controlled slip between the thread delivery wheel and the thread.

The thread delivery wheel has an inlet section which e.g. can be conical. Conical in this sense means that the diameter of the thread feed wheel in the area of the inlet section changes depending on the axial direction. The cone can have the shape of a steep circular cone or other curved shapes. The conical shape enables the thread feed to be generated on the thread delivery wheel by the thread that is coming up. The inlet section is preferably designed as a closed surface area or as a rod cage.

In addition, in an advantageous embodiment, the thread delivery wheel can be provided with a conical thread run-off edge. This can in turn be frustoconical or otherwise conical. The thread run-off edge enables thread bevel withdrawal, which is particularly advantageous in the case of yarns causing deposits, which contain equipment and size or are heavily fluffed.

A storage area is provided between the inlet section and the thread outlet edge, which is preferably not cylindrical and whose diameter is smaller than the diameter of the inlet section and the thread outlet edge. The storage area can have a polygonal outline, so that the thread turns are only taken up by strip-shaped areas of the thread feed wheel. The thread feed wheel can be designed as a rod cage or as a one-piece part, for example as a deep-drawn sheet metal part or as a ceramic part. The polygonal area-by-area arrangement of the thread turns enables the positive delivery without slippage as well as the slippery conveyance of the thread in a particularly good way. The outer diameter can decrease somewhat towards the thread run-off edge.

The Eingangsfadenleiteinrichtung the yarn feeding device is preferably Toggle above the storage area ^• ordered so that the thread is forced to run through the inlet region of the yarn feed wheel to the memory area. The input thread guide device is preferably rigidly mounted, which creates defined thread inlet conditions.

In an advantageous embodiment, the output thread guiding device is also rigidly mounted and preferably arranged below the storage area. It is preferably axially and radially offset from the thread feed wheel, so that it also below the thread run-off edge. stands. This gives the running thread the possibility to slide over the running edge to keep it clean. The rigid, possibly manually adjustable, mounting of the starting thread guide device creates defined thread flow conditions.

Both thread guide devices are preferably arranged in one plane with the axis of rotation of the thread delivery wheel. This creates symmetrical operating conditions, the thread delivery wheel can be driven clockwise or anti-clockwise.

The thread lifting element can be fixedly mounted on the thread delivery device. However, it is preferably manually adjustable. An adjustment device can be provided with which the inclination of the thread lifting element against the longitudinal axis or axis of rotation of the thread feed wheel can be adjusted. This allows adjustments to be made to adapt the thread delivery device to different thread properties or applications.

In addition, the thread lifting element can be adjustably mounted on a circular path which is arranged concentrically with the thread feed wheel. This adjustment option creates improved handling without significantly influencing the thread conveying properties. Especially when space is limited, for example when a large number of similar thread delivery devices are mounted on a machine ring of a circular knitting machine, it can be helpful to swivel a carrier with the lifting element to the side next to the thread delivery device in order to place the thread manually. Is he hung up the carrier can remain in this position or can be pivoted, for example, by 90 °, so that the lifting element stands under the main body or carrier of the thread delivery device and thus no longer takes up space. The position is largely irrelevant for the function of the thread delivery device. This not only increases ease of use but also security against incorrect settings.

The lifting element preferably projects beyond the storage area both at the inlet section and at the outlet edge of the thread delivery wheel. This ensures that the straight thread contact surfaces extend over the entire storage area of the thread delivery wheel.

The thread lifting element is preferably detachably connected to the thread delivery device. As a result, the thread delivery device can be operated as a pure positive feeder if necessary. The thread lifting element can be offered as an additional or add-on part.

With the design of the thread delivery device with two lifting elements, it can be advantageous to store both on different supports, which are adjustable with respect to one another. This has an advantageous advantage in particular when the lifting elements are set to different radii with respect to the axis of rotation of the thread delivery wheel. There is the possibility of placing the two lifting elements behind one another in the radial direction, so that only the outside is effective.

A pulley can be used to drive the thread feed wheel. It is also possible to use the thread delivery device to be provided with an individual electric drive motor that drives the thread delivery wheel. The drive motor can, for example, be operated in accordance with thread requirements or under thread tension control.

Further details of advantageous embodiments of the invention result from the drawing, the description or subclaims.

Exemplary embodiments of the invention are illustrated in the drawing. Show it:

FIG. 1 the thread delivery device in a perspective view,

FIG. 2 shows the thread delivery device according to FIG. 1 in a side view,

FIG. 3 shows the thread delivery device according to FIG. 2 in an end view,

FIG. 4 shows a modified embodiment of the thread delivery device in a side view,

FIG. 5 shows a further modified embodiment of the thread delivery device in a side view,

FIG. 6 shows an embodiment of the thread delivery device with an electric drive in a side view,

FIG. 7 shows an embodiment of the thread delivery device with separate lifting elements in a side view, FIG. 8 shows a further embodiment of a thread delivery device with separate lifting elements in front view,

FIG. 9 shows a lifting element fastened to a carrier in a top view,

FIG. 10 shows a modified embodiment of a lifting element in a top view,

FIG. 11 shows two lifting elements held on separate carriers in a top view,

FIG. 12 shows the geometric relationships of the thread delivery device according to FIG. 1 and an alternative embodiment,

Figure 13 is a yarn delivery device with two diametrically opposite thread lifting elements, based on the representation of its geometric relationships, and

Figure 14 shows the geometric relationships between the thread delivery wheel and the thread lifting element.

FIG. 1 illustrates a thread delivery device 1 which is used to deliver a thread 2 shown in FIG. 2 to a knitting point of a knitting machine, which is not further illustrated, or to another thread consumption point. The thread delivery device 1 has an elongated base body 3, for example made of plastic, which is equipped at one end with a clamp 4 for fastening the thread delivery device 1 to an annular support (machine ring) of a knitting machine. At the opposite end, the base body 3 is provided with thread inlet means 5, to which e.g. an inlet eyelet 7, e.g. made of ceramic, a knot catcher 8, a thread brake 9 and an inlet eyelet 12 held immovably on a rigid support 11, which forms an input thread guiding device 13.

Between the input thread guiding device 13 and the clamp 4, a shaft is rotatably mounted on or in the base body 3 and carries at its upper end one or more pulleys 14, 15 which can be coupled non-rotatably to the shaft via an axially displaceable coupling ring 16. Below the base body 3, the shaft is rotatably connected to a thread delivery wheel 17, which can thus be driven in rotation by the pulleys 14, 15. The thread feed wheel 17 has an inlet section 18, which is characterized in that its diameter decreases from top to bottom with respect to the axial direction A of the thread feed wheel 17. As can be seen, the inlet section 18 consists of a first conical section with a small opening angle, which merges into a second conical section 18b with a very large opening angle. The conical section forms a guide surface 18a as a feed means for the winding 26. The shaft is oriented essentially vertically. In slip-free operation (positive operation), the thread that is not removed can sag downwards like a crank - without being wound backwards.

A storage area 21 adjoins the inlet section 18, which is designed as a closed surface without interruption, the horizontal cross section of which preferably deviates from the circular shape. In the present exemplary embodiment, the thread delivery wheel 17 is formed as a one-piece sheet metal deep-drawn part. The storage area 21 is formed here by a cylindrical section 22 from which ribs 23 protrude. The ribs each have a rounded back on which the thread 2 rests in individual turns 24, 25 as a winding 26. The turns 24, 25 of the thread 2 are exposed between the individual ribs 23. Nevertheless, the yarn feed wheel 17 is free of openings as a whole. The storage area 21 is also closed. The storage area 21 can taper slightly towards the bottom.

Starting from the cylindrical portion 22, the diameter of the ^'yarn feed wheel increases again until it reaches the outside diameter of the ribs 23 exceeds. A thread drain edge 27 then begins here, which widens conically. It forms a smooth, closed surface into which the ribs 23 pass without a step.

The thread feed wheel 17 runs freely, ie it is only in contact with the thread 2. There are no further elements contacting the thread delivery wheel 17 or conveying the thread 2. A thread lifting element 28 is arranged adjacent to the thread delivery wheel 17 and is formed by a U-shaped bracket 29 according to FIGS. 1, 2 and 3. This is preferably made of wire. The bracket 29 has two mutually parallel legs 31, 32 (FIG. 1) which are connected to one another at their lower free end via a web 33. The legs 31, 32 are straight in their sections adjacent to the storage area 21 and extend at an acute angle or parallel to the axial direction A, which is predetermined by the axis of rotation of the yarn feed wheel 17. The legs 31, 32 thus define thread contact surfaces 34, 35 (FIG. 2) over which each turn 24, 25, 26 of the thread 2 leads. The thread contact surfaces 34, 35 are curved (eg cylindrically curved) and in each case straight in the leg longitudinal direction R, specifically over the entire height of the storage area 21. The lower ends of the legs 31, 32 are radially extended slightly outwards, so that the web 33 extends from the Thread delivery wheel 17 is angled away. The bending point is below the storage area. It prevents falling of thread loops lying loosely on the thread drum. At their respective upper ends, the legs 31, 32 are preferably cranked or angled outward above the inlet section 18 (FIG. 3). This prevents incoming thread turns from getting too high. This also prevents thread windings from sliding over the upper edge of the drum and being wound up by the drum axis. The upper shoulder of the pins 31, 32 formed by the offset or bend thus increases operational reliability.

The bracket 29 can in particular be provided with a ceramic coating on its contact surfaces 34, 35. The longitudinal leg direction R coincides with the axial direction of the thread delivery wheel 17 or forms an acute angle with it. As a result, the length of all turns 24, 25, 26 decreases from turn to turn from the inlet side to the outlet side. In this case, as illustrated in FIG. 14, it is important that an acute angle α is formed between the thread contact surface 34 and a surface line M of the storage area 21 opposite the thread feed wheel 17. Instead of the open space between the legs 31, 32, a closed surface can also be provided here.

The two upper ends of the legs 31, 32 are held on a carrier 36 (FIGS. 1 and 3), which is mounted on the base body 3 of the thread delivery device 1 so that it can pivot, for example, about the axis of rotation D of the thread delivery wheel 17 extending in the axial direction Ax. The axis of rotation D is arranged vertically. At its outer end, the carrier 36 has a spring hinge 37 which connects it to the legs 31, 32. The spring hinge 37 holds the legs 31, 32 of the bracket 29 in the relaxed state at an acute angle to the axis of rotation D. As illustrated in FIG. 3, an adjusting screw 38 is provided in the immediate vicinity of the spring hinge 37, which is supported on the carrier 36 and the possibility opened to adjust the pivot position of the bracket 29 with respect to the carrier 36. It is seated in a threaded bore in a base section 39, which is connected to the carrier 36 via the spring hinge 37 and also receives the upper ends of legs 31, 32. Alternatively, it can sit in a threaded bore of the carrier 36 and be supported on the base section 39 (FIG. 1). The setting Availability of the angle of inclination of the bracket 29 allows the thread feed to be adapted to different yarn qualities.

The carrier 36 is designed such that it holds the bracket 29 and thus the legs 31, 32 at a distance of approximately 10 mm to 15 mm from the outer circumference of the storage area 21 of the thread delivery wheel 17. Figure 12 illustrates this. The pin spacing A, i.e. the distance between the thread contact surfaces 34, 35 from one another (FIG. 12) is preferably approximately 15 mm to 20 mm. This applies to a diameter of the thread delivery wheel of approximately 45 mm and leads to the desired wrap angle, which is greater than 180 ° but less than 240 °. In any case, the radius of curvature r of the thread contact surfaces 34, 35 is smaller than the distance A.

FIG. 2 also shows an output thread guiding device 41, to which a bracket 42 belongs, as can be seen from FIGS. 2 and 3. The bracket 42 is arranged laterally next to the thread feed wheel 17 and has a lower horizontal section 43 which guides the thread 2 and which is held laterally below the thread feed wheel 17 (FIG. 3). This causes the thread to be pulled off at an angle. Following the exit thread guiding device 41, a further bracket 44 and an outlet stop 45 are provided, which bear on the thread 2 between the brackets 42, 43. An inlet stop 46, which monitors the thread running to the thread delivery wheel 17, can rest on the thread between the thread brake 9 and the input thread guiding device 13. The thread guide device 41, the inlet eye 12 and the axis of rotation D lie in a common plane. As a result, the thread delivery device 1 has no preferred direction of rotation - the thread delivery wheel 17 can be operated both clockwise and counterclockwise.

The thread delivery device 1 described so far operates as follows:

In operation, the thread delivery wheel 17 is driven in rotation by a belt running over the pulley 14, not shown. The thread 2 wraps around the thread delivery wheel 17 as illustrated in FIG. 2. The turns 24, 25, 26 run over the thread lifting element 28. The speed of the thread feed wheel 17 is dimensioned such that the peripheral speed of the thread feed wheel is slightly greater than the desired maximum thread speed. The windings 24, 25, 26 wrap around the thread feed wheel 17 over a large part of its circumference, but are lifted off the thread feed wheel by the thread lifting element 28. This reduces the frictional engagement between the thread 2 and the thread delivery wheel 17, but the friction is so great that the thread 2 is normally delivered with only slight slippage. The thread has a peripheral speed that e.g. Is 10% less than the peripheral speed of the thread delivery wheel 17.

If the thread consumption point temporarily needs less thread than the thread delivery device 1 delivers, then the required thread speed falls significantly below the peripheral speed of the thread delivery wheel 17. In such a case, the thread tension between the Thread delivery wheel 17 and the thread consumption point. The lifting element 28 has a somewhat braking effect on the thread and prevents the thread from being conveyed further at full speed. The winding built up from the windings 24, 25, 26 loosens somewhat, as a result of which the conveying speed drops until the thread is delivered more slipping and as required. The reduced frictional engagement allows the turns 24, 25, 26 to slip without movement or adjustment of the thread lifting element 28, so that the thread 2 lags behind the thread delivery wheel 17 to a certain extent. It runs significantly slower than the circumferential speed of the thread delivery wheel 17 corresponds. This is particularly favored by the rib structure of the surface of the storage area 21.

The thread lifting element 28 is rigidly supported by the structure of the adjusting device shown in FIG. 3, which is formed from the adjusting screw 38 and the spring hinge 37. The adjusting screw 38 is supported between the thread delivery wheel 17 and the bracket 29 between the carrier 36 and the base portion 39, whereas the spring hinge 37 is located radially on the outside. Increased thread tension can thus not cause the bracket 29 to pivot toward the thread delivery wheel 17.

The carrier 36 is preferably designed to be removable. The thread delivery device 1 can then be operated both as a pure positive feeder without a slip effect and, as described above, as a friction feeder in which the knitting point temporarily reduces less thread with reduced thread tension. It is also possible to provide the carrier 36 with a hinge or joint, with which the thread lifting element 28 can be pivoted or folded into a non-functional rest position. Locking or other locking means can be provided in order to hold the thread lifting element in the working position and in the rest position.

Furthermore, it is possible to use the thread delivery device 1 in both ways, in that the windings 24, 25, 26 are either placed on the thread lifting element 28 or are not placed thereon. In addition, the thread lifting element 28 can be designed to be replaceable, e.g. to provide different brackets 29 for different threads. However, it has been shown that all threads of a wide spectrum of threads tested can run over one and the same bracket 29 if the geometric conditions mentioned above are observed.

A modified embodiment of the thread delivery device 1 is illustrated in FIG. 4. Except for the thread delivery wheel 17, it corresponds in all other parts to the thread delivery device 1 described above (FIGS. 1 to 3), so that the same description is used to refer to the above description. In contrast to the thread delivery wheel 17 described above, however, the thread delivery wheel 17 according to FIG. 4 has the basic structure of a rod cage. It is formed by a plurality of straight rods 48 replacing the ribs 23, which together form a cylinder cage or a very slightly conical cage. The rods 48 sink into an end plate 49, the conical outer surface of which forms the thread run-off edge 27. Openings 51 are formed in the conical outer surface, into which the rods 48 dip. The rods 48 are also in one at their upper end upper cover plate 52, which forms the inlet section 18 with its outer surface.

Another embodiment of the thread delivery device 1 can be seen from FIG. This embodiment largely corresponds to the embodiment according to FIGS. 1 to 3 and differs from it only in the design of the thread run-off edge 27 of the thread delivery wheel 17. This is designed as a straight truncated cone, i.e. the radius of the thread run-off edge 27 increases linearly with the axial direction of the thread feed wheel 17 from top to bottom. Otherwise, the structural and functional description given for FIGS. 1 to 3 applies based on the same reference numerals.

FIG. 6 illustrates a further embodiment of the thread delivery device 1, which is characterized in that an electric motor 53 is provided for driving the thread delivery wheel 17. This sits in the base body 3 or protrudes from it, as can be seen from FIG. 6. It is also possible to place the electric motor 53 on top of the base body instead of the pulleys 14, 15. The thread delivery wheel 17 can be designed according to any of the versions described above. Here, the lifting of the thread from the thread feed wheel 17 has the function of allowing the thread feed wheel to slip through if the thread delivery and thread take-off do not match exactly, in particular if the thread is taken down without the stop responding.

In all the embodiments of thread delivery devices 1 described above, instead of a thread lifting element 28 with a fixed assignment of the two legs 31, 32 to one another, the design shown in FIG. 8 with two thread lifting elements 28a, 28b can also be used. Both are held on their own supports 36a, 36b via their own base sections 39a, 39b. Pins 54, 55 of straight design, which like the legs 31, 32 are arranged essentially parallel to the axis of rotation D or at an acute angle thereto, serve as thread lifting elements. The pins 54, 55 are aligned parallel to one another, and they can also be adjusted differently by their adjusting screws 38a, 38b if necessary. The two supports 36a, 36b can be pivoted independently of one another, so that the pins 54, 55 can be set at different distances from one another. In this way, the engagement angle !, with which the thread 2 rests on the thread delivery wheel 17, can be controlled manually, as a result of which the thread delivery device 1 can be adapted to installation conditions and / or thread properties. This can be seen, for example, from FIG. 7, which illustrates the two supports 36a, 36b which can be pivoted towards and away from one another. In addition, FIG. 7 illustrates the parallel alignment of the pins 54, 55, which is maintained regardless of the inclination to the axis of rotation D.

FIG. 9 illustrates a modified embodiment of the thread lifting element 28. In contrast to the embodiment illustrated in FIGS. 1 to 6, in which the thread lifting element 28 is formed by a bracket 29, it is here formed by a solid web 56 which forms one forms an elongated cross section with rounded flanks. The rounded flanks define the thread contact surfaces 34, 35. The web 56 can, for example, be made of .hard metal, ceramic or another

rs ren wear-resistant fabric be formed. It can also be bent from sheet metal and provided with a hard material coating, for example ceramic. It is rigidly connected or manually adjustable by means of an adjusting device (not illustrated further) to the carrier 36, which has an annular extension 57 for attachment to the basic carrier 3.

As shown in FIG. 10, the web 56 can have a fillet 58 between its thread contact surfaces 34, 35, which the thread 2 spans. Operation as described in connection with FIG. 13 can be achieved.

In both embodiments of the thread lifting element 28, according to FIG. 9 and according to FIG. 10, the distance between the thread contact surfaces 34, 35 is preferably in the range between 15 mm and 20 mm. Thus, the web 56 replaces the bracket 29 and works like this.

The modification of the embodiment according to FIGS. 7 and 8 illustrated in FIG. 11 is also possible. FIG. 7 assumes that both pins 54, 55 are arranged at the same distance from the thread delivery wheel 17. The carriers 36a, 36b are thus of the same length. In a departure from this, the embodiment according to FIG. 11 provides carriers 36a, 36b of different lengths, so that the two pins 54, 55 are held at different distances from the axis of rotation D and the thread delivery wheel 17. This opens up the additional possibility of rendering the pin 55 ineffective by pivoting it into the position 59 shown in dashed lines in FIG. Figure 12 illustrates an alternative with dashed lines. The legs 31, 32 are replaced by a single thread lifting element 28 ', which is arranged at a large distance from the thread feed wheel 17. This is dimensioned such that the angle β is unchanged, which the thread 2 running to the leg 31 encloses with the thread 2 running away from the leg 32.

FIG. 13 discloses a further embodiment of a thread delivery device with two pins 54, 55. These are arranged at an angular distance of approximately 180 °. The pin 54 is arranged in a fixed manner, while the pin 55 can be mounted so as to be adjustable in the direction of the arrow 61. The pin 54 thus defines a lifting zone of e.g. 70 ° fixed, while the other lifting zone is variable. The wrap angle γ is the sum of both partial wrap angles γl and γ2.

A thread lifting element 28 is provided on a positive feeder and has straight thread contact surfaces 34, 35. These are not adjustable in their position by the thread 2 and, if necessary, allow the thread to slip with respect to the thread delivery wheel 17. This additional measure thus allows the positive feeder to open up areas of application which were previously closed to him because of the required synchronicity between thread delivery and thread consumption. Reference list:

1 thread delivery device

2 threads

3 basic bodies

4 clamp

5 thread enema

7 inlet eyelet

8 knot catchers

9 thread brake

11 carriers

12 inlet eyelet

13 input thread guiding device

14, 15 pulleys

16 coupling ring

17 Thread delivery wheel

18 inlet section

18a, 18b sections

19 Thread protection sleeve

21 thread conveying area

22 cylindrical section

23 ribs

24, 25.26 turns

27 thread run-off edge

28 thread lifting element

29 bracket

31, 32 legs

33 footbridge

34, 35 thread contact surfaces

36 carriers

37 spring hinge

38 adjusting screw

39 base section

41 Exit thread guiding device hanger

web

hanger

output stop

Einlaufabsteller

Rod

end disk

openings

lens

engine

pencils

web

approach

fillet

position

Claims

Claims:

1. thread delivery device (1) for delivering a thread (2) to a thread consumption point,

with a thread feed wheel (17) which has a storage area (21) for receiving a thread spool (26) and an inlet section (18) with a feed means (18a) in order to effect a spool feed,

with a rotary drive device (14, 15, 53) which is connected to the thread delivery wheel, and

with at least one thread lifting element (28) which is arranged next to the thread delivery wheel (17) and is held stationary and has a thread contact surface (34) for turns (24, 25) of the thread winding.

2. Thread delivery device according to claim 1, characterized in that the feed means is formed by an annular, in the axial direction (Ax) tapering guide surface (18a) which merges into the storage area (21) without a step.

3. Thread delivery device according to claim 1, characterized in that the thread delivery wheel (17) is a rod cage, the rods (48) of which define the storage area (21) and the inlet area (18).

4. Thread delivery device according to claim 1, characterized in that the thread delivery wheel (17). through a one-piece drum with a by ribs (23) formed profiling in the memory area (21) is formed.

5. Thread delivery device according to claim 1, characterized in that the diameter of the storage area (21) decreases in the thread running direction.

6. Thread delivery device according to claim 1, characterized in that in front of the thread delivery wheel (17) an input thread guide device (13) for the thread delivery wheel (17) running thread (2) is provided, which is arranged stationary, and that behind the thread delivery wheel (17) an output thread guide device (41) is provided for the thread (2) running away from the thread feed wheel (17).

7. Thread delivery device according to claim 1, characterized in that the thread contact surface (34),

- is straight and smooth in a given direction (R),

- Is held in a fixed orientation to the thread feed wheel (17) during the operation of the thread delivery device (1), and

- Includes an acute angle () with the remote side of the thread feed wheel, the wrap angle (γ) of each turn with which the thread of the turn bears against the thread feed wheel being constant and less than 240 °.

8. Thread delivery device according to claim 1, characterized in that the input thread guide device (13), the output thread guide device (41) and the thread feed wheel (17) on a common plane. are arranged, and that the input thread guide device (13) is arranged above the storage area (21), that the output thread guide device (41) is rigidly mounted and that the output thread guide device (41) is arranged below the storage area (21).

9. Thread delivery device according to claim 1, characterized in that the thread lifting element (28, 28a, 28b) is manually adjustable.

10. Thread delivery device according to claim 1, characterized in that the thread lifting element (28, 28a, 28b) axially projects beyond the storage area (21) of the thread delivery wheel (17) on the inlet section (18) and on its thread outlet edge (27).

11. Thread delivery device according to claim 1, characterized in that the thread lifting element (28) on the thread delivery device (1) is detachably held.