EP1330408B1 - Thread supplying device - Google Patents

Description

The invention relates to a yarn feeding device specified in the preamble of claim 1 Art.

In the yarn feeding device known from US-A-4 676 442, the ring support is fixed to the casing boom. The cooperating permanent magnets are arranged on the one hand in the ring support and on the other hand in the cylindrical region of a front part of the storage body to prevent co-rotation of the storage body with the rotationally driven winding shaft in the operative position. The permanent magnets act together only in the radial direction, based on the memory body axis. In case of a malfunction access to the storage body surface is hindered by the ring support and the annular thread brake.

In the yarn feeding apparatus known from DE-B-2 701 718 a arm extending along the storage body is arranged on a stationary support of the winding shaft, the free end of which is bent towards the storage body axis and supports a withdrawal eye. The arm is pivotally mounted on the carrier in an axis perpendicular to the storage body axis and is supported in the operative position in which the trigger eye is aligned with the storage body axis by a ball latch. The arm carries a ring support with inwardly standing, elastic fingers, which produce a thread braking effect, and cooperate with a toothed peripheral surface at the front end of the storage body to hindem in the operative position of the storage body against turning with the rotary driven winding shaft. The arm can be released around the axis from the operative position access to the storage body.

A known from US-A-5 094 275 yarn feeding device has on its housing on the winding shaft freely rotatable storage body which is magnetically held stationary by permanent magnets in the housing and thereon aligned permanent magnets in the storage body against rotation. The permanent magnets act magnetically through a gap between the housing and the storage body, in which gap with the winding shaft a winding element rotates. An annular thread brake cooperates with the storage drum in contact. The housing extension supports an axial extraction eye and a suction nozzle structure. The thread brake is mounted on the ring support and can be axially adjusted with this, to allow passage for threading a new thread by means of a pneumatic threading system from the winding element to the trigger eye. To accommodate the permanent magnets of the storage body requires a special shape and complex structural measures are required in the housing. In the Einfädellage access to the storage body is severely limited.

The yarn feeding device known from US Pat. No. 5,489,068 has on the housing a storage body which can be driven for rotation, in the front end of which a brush brake is integrated. On the housing, a boom is mounted on which by means of an arm, a conical hollow body is mounted. In the arm, a pivot joint and a coupling for moving the conical hollow body between the operative position and a staggered position is provided. In the operative position of the conical body is aligned coaxially with the storage drum and slipped over the storage body front end with a circumferential gap. In the staggered position, the conical hollow body is moved away from the storage body by axial and rotational movement to release access to the storage body. In order to rotate the conical hollow body synchronously with the storage body rotation, the conical hollow body is held in a pivot bearing of the arm. Furthermore, magnetically interacting permanent magnets are provided on the outside of the conical body and inside the storage body, which entrain the conical hollow body during rotation of the storage body.

Known on the market is a yarn feeding machine for knitting machines from Memminger-Iro GmbH, DE under the type designation SFE (shown in FIG. 4 in EP 0 658 507 A), which has a characteristic design and a rotatably driven storage body with a storage body in the housing Boom associated, optoelectronic thread scanning device has. The SFE yarn feeding device is compact, the storage of the storage body is partially incorporated in the housing in the drive motor. This construction principle can be realized only with the rotatable storage body. Although the SFE yarn feeding device has proved to be extremely successful, in practice modern knitting machines occasionally have operating conditions with yarn speeds or yarn speed variations that are so high that the construction concept with the rotationally driven storage body and with the rotating braking element has different reasons, e.g. too high thread tension, finds its limit. In this construction concept, for example, a low and constant yarn tension at high yarn speeds would be desirable, but this would require fundamental modifications.

The invention has for its object to provide a yarn feeding device, especially for knitting machines with high yarn speed, which is characterized by a compact design, easy to use also with regard to the threading of the new thread, and coped with high thread speeds easily. Part of the task is to make the yarn feeding device according to the invention in the widest possible adaptation to the design of the known SFE delivery device using a large number compared to the SFE delivery device unmodified components for applications in which due to example high yarn speed, widely varying consumption and / or sensitive filament qualities a rotationally driven storage body is no longer timely.

The stated object is achieved with the features of claim 1.

The yarn feeding device is compact, since in the area of the rotary bearing of the winding shaft in the housing no structural measures for holding the storage body against turning with the winding shaft are required, but this essentially the space is used, which is already available at the front end of the storage body. The ring support is used to support the thread brake, which is like the storage body mounted substantially stationary and therefore can cope with very high thread speeds, and in addition to housing the permanent magnets, which cooperate with placed in the range of the already usable front end of the storage body permanent magnet and the storage body fix stationary. The mobility of the ring support relative to the housing or to the housing-fixed arm is expedient in order, for example, to enable the replacement of the thread brake in the service position and / or to clear unimpeded access (threading position) to the storage body for threading a new thread. The stationary storage body with the stationary yarn brake, in particular a user-friendly Strohring, allows easy processing twist-sensitive thread material and at high yarn speeds up to 1200 m / min and / or greatly varying consumption. The ring support is mounted in a pivotal mounting of the housing or the housing arm so that it can be moved back and forth in an arcuate trajectory. This allows a comfortable one-hand operation. A stable and space-saving storage of the ring support results with a pivot bearing at the free end of the housing fixed arm and an axis perpendicular to the axis of the storage body, preferably even tangential, and with stops that in the operative position of the ring support the mutual attraction of the Use permanent magnets for positioning.

With the construction principle according to the invention can be created using a variety of components of the SFE yarn feeding device, a yarn feeding device whose appearance is similar to that of the SFE yarn feeding device and has substantially the same compact dimensions as this. In fact, modifications are essentially required in the area of the storage body front end. The compactness of the yarn feeding device is of particular advantage since, as a rule, in a knitting machine a very large number of such yarn feeding devices are closely adjacent is to be arranged to each other, with time losses during threading a new thread can be avoided by the good accessibility in the threading position of the ring support.

In order to ensure the multiple function of the ring support in the smallest possible space, the ring support should be designed as a truncated cone, in the small diameter end portion of the permanent magnets are placed in a ring assembly, and the free, the other permanent magnets having front end of the storage body should be frusto-conical. In this way, the gap between the cooperating permanent magnets for undisturbed thread passage can form far enough and still produce a high rotational holding force for the storage body.

It is expedient to provide a retaining arm holding a withdrawal eye on the ring support, which arm is simultaneously used as an operating handle for adjusting the ring support.

A socket open to the storage body for the, e.g. Loosely applied, thread brake allows rapid replacement of the thread brake, e.g. a Strohring which optionally requires no further holding means.

The inner diameter of the small diameter end portion of the ring support should be smaller than the outer diameter of the storage drum.

At the front end of the rod drum-shaped storage body expediently a cup-shaped insert is set, in which the permanent magnets are housed. The insert uses the already existing free space at the front end of the storage body. The insert is also low manufacturing and assembly technology, covers the pivot bearing of the storage body to the outside and forms a favorable for the thread control, frusto-conical nose portion of the storage body. The insert also protects against excessive, the yarn path disturbing lint deposits in this area.

In this case, cone tip angles between 60 ° and 75 ° are expedient.

Fig. 1

einen Axialschnitt eines erfindungsgemäßen Fadenliefergeräts in der operativen Lage.

Reference to the drawings, embodiments of the subject invention will be explained. Show it:

Fig. 1

an axial section of a yarn feeding device according to the invention in the operative position.

A yarn feeding device F, in particular for knitting machines, in FIG. 1 has a housing H, which is fixed stationarily by means of a clamping holder 1 on a support, not shown, on the knitting machine. The housing H has an axis X to which a housing-fixed, laterally angecrdneter boom 2 is substantially parallel. In the housing H, an electric drive motor M is arranged for a winding shaft S, whose axis coincides with the axis X and which is rotatably mounted in a bearing 22 in the housing H. The bearing 22 may be at least partially overlaid with the motor M in the direction of the axis X. On the winding shaft S is a laterally obliquely wegstrebendes winding element W, for example in the form of a winding disk, fixedly mounted. On the winding element W projecting end portion of the winding shaft S is a, for example, rod drum-shaped storage body D with a hub and a rotary bearing 15 freely rotatably mounted. In the storage body D, a feed element 13 may be supported by means of a tilted to the X axis pivot bearing 12 such that it rotates the winding shaft S performs a wobbling movement, thereby reaching between bars 14 of the storage body D outwards and the wound yarn turns to the free front end of the storage body D. pushes forward. The yarn feeding device F is predominantly in the position shown in Fig. 1, i. standing vertically, inserted.

With the housing H, at the free end of the boom 2, a in the operative position shown in Fig. 1 to the axis X coaxial ring support R in a pivot bearing 3 is connected. The pivot bearing 3 has at the free end of the boom 2 a perpendicular to the axis X, to the storage body D in approximately tangential axis at which the ring support R is articulated with a bracket 5. Between the bracket 5 and the boom 2 positioning stops 7, 6 are provided, which define the operating position of the ring support R shown. At the ring support R, an obliquely projecting arm 8 is also fixed, which contains a withdrawal eye 9 which is coaxial with the axis X.

The ring support R has a storage body D open, stepped and circumferential socket 4 for an optional, e.g. annular thread brake B (for example, a radial play inserted Strohring), which is in the operative position of the ring support R either with the withdrawal edge at the free front end of the storage body D or with its outer periphery in touching contact. In the illustrated embodiment, the yarn brake B is a so-called Strohring with feathers, obliquely set teeth or bristles. Alternatively, a brush ring or lamellar ring can be used as thread brake B in the socket 4, or a so-called ring brake having a support ring mounted in the socket 4 and a circumferentially continuous, against the withdrawal edge of the storage body D axially pressed band brake ring frusto-conical shape, e.g. a so-called flexbrake.

Since, during rotation of the winding shaft S, the storage body D would be entrained via its pivot bearing 15, it is necessary to support the storage body D in a stationary manner relative to the housing H. For this purpose, the ring support is additionally formed as a carrier of a plurality of permanent magnets P2, which are embedded in the ring support R, and further permanent magnets P1 are positioned in the free front end of the storage body D aligned on the permanent magnet P2, which belong to the storage body D. The permanent magnets P1, P2 may be distributed annularly over the respective peripheral region and are inclined relative to the axis X. They interact magnetically through a circumferential gap between the ring support R and the front end of the storage body. The resulting magnetic forces of the housing H associated permanent magnet P2 to the storage body D associated permanent magnet P1 hindem the storage body D at co-rotating with the winding shaft S.

The ring support is substantially frusto-conical, conveniently with a short cylindrical portion 20 in which the socket 4 is provided, and a conical portion 19 in which the permanent magnets P2 are arranged. The inside surface could be smooth (balloon refraction function).

The boom 2 also carries a sensor device 21 for scanning the thread and the storage body D. Signals emitted by the sensor device 21 can be used to control the drive motor M so that, depending on demand, a certain thread supply on the storage body D is maintained between predetermined maximum and minimum limits fluctuate. The thread is from the consuming textile machine, z. B. a knitting machine or a weaving machine from the yarn supply on the storage body D over the front end of the storage body D and withdrawn through the take-off eyelet 9 approximately in the direction of the axis X, wherein the thread rotates about the front end of the storage body D and the thread control and Generating a certain, substantially constant yarn tension by the yarn brake B is acted upon.

For threading a thread in the yarn feeding device F, a conventional threading needle T can be used, which is pushed through a guide channel 10 formed by the hollow initial region of the winding shaft S and an inner channel 11 of the winding element and pulls through the new thread. The thread end is then grasped by hand and threaded in the threading position displaced ring support through the yarn brake B in the trigger eye 9. Since in the Einfädellage the ring support R, the rotation of the storage body D is repealed, the rotational position, eg for Säubem the storage body or the scanning, set or can then be set a new rotational position for the storage body D. After the thread is pulled through the trigger 9, the ring support R is back in the reset operative position in which it is held by the magnetic force and prevents the storage body D in one of possibly more. By the positioning of the permanent magnets P1, P2 predetermined rotational positions again co-rotating. The yarn brake B then acts on the first loose yarn on the storage body D. By turning on the motor M are immediately wound against the resistance of the yarn brake B held thread new turns on the storage body D, so that the yarn feeding device F immediately return to normal Operation is ready.

Claims (8)

1. A yarn feeding apparatus (F), especially for knitting machines, comprising a housing (H) in which a storage body (D) is rotationally positioned on a rotationally drivable winding shaft (S) of a winding element (W), permanent magnets (P1, P2) which are assigned to the housing and the storage body and oriented towards each other and which cooperate magnetically and stationarily support the storage body (D) against co-rotation with the winding shaft relative to the housing, and an extension arm (2) which is fixed to the housing and has arranged thereon a ring support (R) for a ring-shaped yarn brake (B) which in an operative position is concentric to the storage body axis (X) and is pressed with contact pressure of the yarn brake against the storage body, the permanent magnets (P2) which are assigned to the housing (H) for supporting the storage body (D) against co-rotation with the winding shaft (S) being incorporated into the ring support (R) of the yarn brake (B), which ring support is supported by the extension arm (2), in the direction of the rotation of the winding shaft (S) such that it remains fixed to the housing,the permanent magnets (P1) assigned to the storage body (D) being placed in the region of the front end of the storage body, characterized in that the ring support (R) can be pivoted in a pivot bearing (3) at the free end of the extension arm (2) out of the operative position along a curved movement path into a service position where the permanent magnets (P1, P2) are magnetically separated and release the storage body for free rotational movement, that the pivot bearing (3) comprises positioning stops (6, 7) for defining the operative position, and that the permanent magnets (P1, P2) are inclined relative to the axis (X) of the storage body such that, in the operative position, the ring support (R) is supported by the magnetic force between the permanent magnets (P1, P2) at the positioning stops (6, 7).
2. The yarn feeding apparatus according to claim 1, characterized in that the pivot bearing (3) comprises a pivot axis which is arranged on the free end of the extension arm (2) fixed onto the housing and is approximately perpendicular relative to the axis (X), preferably tangential to the storage body (D).
3. The yarn feeding apparatus according to claim 1, characterized in that the ring support (R) has the shape of a frustoconical ring (19, 20) in the small-diameter end portion of which the permanent magnets (P2) are placed in an annular arrangement, and that the free front end of the storage body (D) which supports the permanent magnets (P1) has a frustoconical shape.
4. The yarn feeding apparatus according to claim 3, characterized in that the inner diameter of the small-diameter region of the ring support (R) is smaller than that of the outer diameter of the storage body (D).
5. The yarn feeding apparatus according to claim 3, characterized in that the front end of the storage body (D) is formed by a preferably pot-shaped insert (7) fixed at the front side to the storage body (D), and that the insert contains the permanent magnets (P1) in an annular arrangement.
6. The yarn feeding apparatus according to claim 3 characterized in that the cone apex angles of the front end and of the ring support (R) are at least approximately identical between 60° and 75°.
7. the yarn feeding apparatus according to claim 1, characterized in that an arm (8) which holds a withdrawal eyelet (9) is provided on the ring support (R) and is designed as an adjusting handle of the ring support (R).
8. The yarn feeding apparatus according to claim 1 characterized in that the ring support (R) comprises an enclosure (4) which is open towards the storage body (D) and is used for securing the yarn brake (B).

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