CN1295124C - yarn feeder - Google Patents

Abstract

A yarn feeder comprising a housing (H), a storage body (D) rotatably positioned on a winding shaft (S), permanent magnets (P1, P2) assigned to the housing and to the storage body and oriented relative to each other, which support the storage body (D) in a fixed manner; and an extension arm fixed to the housing and provided with a ring-shaped support thereon as a ring-shaped yarn brake, the ring-shaped support being adjustable from an operating position to a threading position remote from the storage body, the permanent magnet (P2) assigned to the housing (H) being integrated into the ring-shaped support (R) of the yarn brake (B), the permanent magnet assigned to the storage body (D) being placed in the region of its front end, the opposite permanent magnets (P1, P2) being magnetically separated in the threading position of the ring-shaped support (R), the storage body being released for free rotational movement.

Description

yarn feeder

The invention relates to a yarn feeder suitable for a knitting machine.

A yarn feeder disclosed by EP 0 370 066 has a housing on which a yarn storage body that can freely rotate on a reel is provided, and the permanent magnets in the housing and the permanent magnets arranged in a straight line in the yarn storage body The magnets are magnetically held in place to prevent co-rotation. The permanent magnet acts magnetically through the gap between the housing and the storage body, in which gap a winding part rotates together with the reel. A ring-shaped weft thread brake cooperates with the storage drum in a touch-contact manner. The elongate arm of the housing supports the axial extraction hole and nozzle structure. The weft yarn brake is mounted on a ring support and can be adjusted axially to feed a new yarn from the winding part upwards into the withdrawal hole via the pneumatic yarn system. In order to accommodate the permanent magnets, the storage body requires a specific shape and complex structural dimensions within the housing. In the threading position, the access to the storage body is greatly restricted.

WO 92/195245 discloses a yarn feeder, arranged on a housing, with a drivable yarn storage body for rotation, in which a brush brake is incorporated in the front section of the yarn storage body. An elongated arm is mounted on the upper side of the housing, on which a conical hollow body is arranged via an arm. In said arm, a pivot shaft joint and a coupling are provided to move the conical hollow body between an operative position and a deflected position. In the operating position, the cone is oriented coaxially with the storage drum, being drawn with a circumferential gap above the front end of the storage body. In the offset position, the conical hollow body is moved away from the storage body by an axial and rotational movement to the storage body. In order to rotate the conical hollow body and the yarn storage body at the same time, the conical hollow body is fixed in the rotating bracket of the arm. In addition, a magnetic linkage permanent magnet is provided on the outside of the cone and inside the yarn storage body, and the permanent magnet is dragged along the cone hollow body due to the rotation of the yarn storage body.

The yarn feeder for knitting machines of Memminger-Iro GmbH in Germany is marketed under the model name SFE (shown in Figure 4 of EP 0 658 507 A), which consists of a typical design and a photoelectric yarn A rotatably driven yarn storage body of a line scanning device assigned to the yarn storage body in an elongated arm fixed to the housing. The SFE yarn feeder is a compact structure, the bracket of the yarn storage body is combined with the drive motor part in the housing. The construction principle is only partially realized by the rotating yarn storage body. Despite the excellent performance of the SFE yarn feeder, the construction principle with a rotatably driven yarn storage body and a rotating brake part is limited for different reasons, e.g. High yarn tension, modern knitting machines actually sometimes present operational problems. In this construction principle, low and stable yarn tensions are preferred, for example at high yarn speeds. But this requires fundamental changes.

The object of the present invention is to specify a yarn feeder, in particular for knitting machines with high yarn speeds, characterized in that it has a compact construction, facilitates the threading of new yarns and enables Trouble-free processing at high yarn speeds. Part of this purpose consists in designing the yarn feeder of the present invention so that it is substantially adapted to the design of known SFE yarn feeders which use a large number of components which are substantially unchanged compared to the SFE yarn feeder for use in The following fields of application, for example due to high yarn speeds, drastically changing consumption and/or sensitive yarn quality, rotatably driven yarn storage bodies are no longer new.

The above object is achieved by the following technical features, that is, a yarn feeder F, suitable for knitting machines, comprising a housing H, wherein the yarn storage body D is rotatably positioned on a rotatably driven reel S of a winding part W above; the permanent magnets P1, P2 respectively assigned to the housing and the storage body and oriented to each other, while magnetically engaging and firmly supporting the storage body against co-rotation with the reel relative to the housing, and fixed to the housing and in An elongated arm 2 on which is provided at least one annular support R with an annular yarn brake B interacting with the front end of the storage body in an operating position concentric with the storage body to A contact pressure against the yarn storage body is generated on the yarn brake, the annular support R is adjusted between an operating position and an active position, in which the yarn brake B is separated by the front end of the yarn storage body, which Characteristic in that the permanent magnet P2 assigned to the housing H is integrated into the annular support R with the yarn brake B, for supporting the storage body D, by means of an elongated arm in the direction of rotation of the reel S relative to the housing H 2 to support the ring support R, through the permanent magnet P2 to prevent co-rotation with the reel S, the permanent magnet P1 assigned to the storage body D is placed in the front end area, and at the starting position of the ring support R, it is assigned to the storage The permanent magnet P1 of the body D is magnetically separated from the permanent magnet P2 assigned to the ring support R, which is located at the end of the extension arm 2 of the housing H, to release the storage body for free rotational movement around the storage body axis X. The pivot bearing 3 moves along the curved moving route between the operating position and the starting position, and the pivot bearing 3 is arranged at one end of the extension arm 2, which includes a pivot perpendicular to the axis X of the yarn storage body D, The positioning stoppers 6, 7 are arranged to define an operating position, and the annular support R is supported on the positioning stoppers 6, 7 by the magnetic force between the permanent magnets P1, P2 in the operating position.

The yarn feeder is a compact design as there is no structural dimension required to hold the storage body against co-rotation with the shaft in the area of the pivot bearing of the reel in the housing, but is mainly utilized at the front end of the storage body in the Available structure space at any speed. The ring support is used to support the yarn brake, which, like the yarn storage body, is supported essentially in a fixed manner and thus can handle very high yarn speeds. In addition, the ring support can be used to accommodate permanent magnets, the The permanent magnet cooperates with the permanent magnet arranged at the front end area of the yarn storage body which can be used at any speed, and can fix the yarn storage body. Relative to the housing or the elongated arm fixed to the housing, the movability of the annular support is advantageous in allowing, for example, an exchange of the weft brake at the operating position and/or providing unhindered access to the storage body (wearing). yarn position) to thread a new yarn. The fixed yarn storage body with fixed weft brake, especially the easy-to-use straw ring, allows high yarn speeds up to approx. 1200m/min and/or highly variable consumption Handles yarn materials that are sensitive to entanglement.

Based on the structural principle of the present invention, using multiple components of the SFE yarn feeder, a yarn feeder similar in appearance to the SFE yarn feeder can be provided, which has basically the same compact size as the SFE yarn feeder, because the yarn storage A lot of changes are needed in the front end area of the body. The compactness of the yarn feeders is particularly advantageous because usually in knitting machines a large number of these yarn feeders are arranged next to each other in a compact area, the time lost by threading a new yarn passing through the threading position in the ring support The ease of penetrability prevents.

Suitably, the annular support is secured to a pivot bearing of the housing or to an elongated arm of the housing so that it can move back and forth along an arcuate path of travel. This allows comfortable one-handed operation. Here, however, the ring holder can be turned away and in the same way turned laterally or pulled away axially.

By means of a pivot bearing at the free end of the elongated arm of the fixed housing and by means of an axis positioned perpendicularly, preferably even tangentially, to the axis of the storage body, and by means of mutual attraction using permanent magnets in the operating position of the annular support Positioned stop for stable and space-saving support of the ring support.

Expediently, the ring carrier is provided with an arm on which the extraction opening is fixed, which at the same time serves as an actuating device for adjusting the ring carrier.

An accessory that is open to the storage body and serves as, for example, a weft brake in loose contact therewith allows a quick exchange of the weft brake, such as a straw ring, which, if necessary, can be manipulated without any other fixing means.

In order to ensure the multi-functionality of the annular support in a very limited construction space, the annular support should be designed as a frustoconical ring, in its small diameter end the permanent magnets are arranged in a ring, and the yarn storage body containing other permanent magnets The free front end should have a frusto-conical design. The gap between the cooperating permanent magnets can be made wide enough to allow unrestricted passage of the yarn and still produce a high rotational holding force on the yarn storage body.

In particular, for sensors operating on different areas of the storage body's circumference, it is possible to predetermine the rotational position of the storage body by placing permanent magnets in said positions - sensing devices that find the best working conditions.

The inner diameter of the small diameter end of the annular bracket should be smaller than the outer diameter of the storage drum.

At the front end of the storage body designed as a rod cage, a pot-shaped insert is advantageously fixed and contains permanent magnets. The insert utilizes the free space available at any speed on the front end of the storage body. In addition, the insert, which is advantageous for manufacture and assembly, covers outwardly the pivot bearing of the storage body, forming a frusto-conical head of the storage body which facilitates yarn control. In addition, the insert prevents excessive lint deposition in said region which hinders the running of the yarn.

Here, a cone angle of between 60° and 75° is advantageous.

For comfortable and time-saving threading of a new yarn, the reel on which the winding element is provided should form a threading needle for manual threading or a joint passage for the threading air flow of pneumatic threading. Therefore, when the ring support has been moved to the threading position, the new yarn can easily pass manually through the weft brake and reach the extraction hole, and the new yarn quickly moves upwards through the reel and the winding part and enters the surface area of the storage body.

The pre-threaded state on the surface of the yarn storage body can be achieved particularly easily by means of a yarn-conducting channel or a threading air nozzle at the end of the reel on the inlet side, which is introduced into the conducting channel and forms a Air nozzle required for partial threading. The new yarn needs to be brought for example only into the area of the threading air nozzle after the operation and is automatically blown through the conduction channel up to the storage body where it is manually controlled and threaded through the exposed yarn brake into the extraction hole.

The invention is described by way of example with reference to the accompanying drawings, in which:

Figure 1 is an axial section of a yarn feeder according to the invention in the operating position.

In Fig. 1, a yarn feeder F, especially suitable for knitting machines, comprises a housing H secured by a clamp handle 1 to a chuck (not shown) of the knitting machine. The housing H has an axis X, along which a transversely aligned elongate arm 2 fixed to the housing extends substantially parallel. In the housing H there is provided an electric drive motor M for the reel S, the axis of which coincides with the axis X and which is rotatably supported in a bearing 22 of the housing H. The bearing 22 is at least partially coincident with the motor M in the direction of the axis X. On the reel S, the winding part W extends out in a laterally inclined manner, for example in the form of a winding disc, mounted in a fixed manner. A storage body D with hub and pivot bearing 15 , for example in the form of a rod holder, is supported in a freely rotatable manner at the end of a reel S protruding above the winding part W. Inside the storage body D, the advancing part 13 is supported by pivot bearings 12, said bearing 12 being inclined relative to the axis X so that due to the rotation of the reel S, the bearing 12 performs a tumbling movement so that between the rods 14 of the storage body D Clamp outwards and push the wound yarn loop forward to the free front end of the storage body D. The yarn feeder F is mainly used in the position shown in Fig. 1, ie in a vertical upright position.

An annular support R coaxial with axis X in the operating position in FIG. 1 is connected to housing H in pivot bearing 3 , preferably at the free end of extension arm 2 . The pivot bearing 3 sets an axis at the free end of the extension arm 2, which is perpendicular to the axis X and approximately tangent to the yarn storage body D, and is combined with the ring support R with the bracket 5. Positioning detents 7 , 6 defining the illustrated operating position of the annular support R are provided between the carriage 5 and the extension arm 2 . Furthermore, an oblique projecting arm 8 comprising an extraction hole 9 coaxial with the axis X is fixed on the annular support R. As shown in FIG.

The ring support R comprises a stepped surrounding appendix 4, which is open to the yarn storage body D, serving as an optionally available, e.g. annular, yarn brake B (e.g. a straw ring inserted with a radical play) , the yarn brake in the operating position of the ring support R is in touch contact with the retraction edge at the free front end of the storage body D or with the outer ring therein. In the illustrated embodiment, the thread brake B is a so-called grass ring with elastic and obliquely oriented teeth or bristles. Alternatively, brush rings or lamellar rings can be used as a yarn brake B or so-called ring brake in the attachment 4, which consists of a support ring supported in the attachment and a frustoconical continuous outer circumference. An endless braking band, for example a so-called bending brake, is pressed axially on the retracted edge of the storage body D.

Because the yarn storage body D is drawn together via the pivot bearing 15 due to the rotation of the spool S, the yarn storage body D must be fixedly supported relative to the housing H. As a result, the ring support is additionally designed as a chuck for several permanent magnets P2 and other permanent magnets P, the permanent magnets P2 being for example embedded in the ring support R, the permanent magnets P1 aligned in line with the permanent magnets P2 and belonging to the storage body D , positioned at the free front end of the yarn storage body D. Said free front end is formed by an insert 17 fixed to the front end of the yarn storage body D by a bolt 18 . The permanent magnets P1 , P2 can be distributed in a ring on the respective peripheral part, inclined with respect to the axis X. They exert a magnetic force on each other through the peripheral gap between the ring support R and the front end of the storage body. Relative to the magnetic force of the permanent magnet P1 assigned to the yarn storage body P, the magnetic force generated by the permanent magnet P2 assigned to the housing H prevents the yarn storage body D from co-rotating with the spool S.

The annular support is substantially frusto-conical, preferably with a short cylindrical section 20 in which the appendage 4 is located and a conical section 19 in which the permanent magnet P2 is located. The inner surface may be smooth (balloon breaking effect).

In addition, the extension arm 2 has a sensor 21 for detecting the yarn and the storage body D. The signal output by the sensor 21 can be used to control the drive motor M so that, according to the respective needs, a specific yarn supply is always observed on the storage body D, said yarn supply at predetermined maximum and minimum change within limits. The yarn is drawn out from the yarn supply on the yarn storage body D outside the front end of the yarn storage body D by a consumed textile machine, such as a knitting machine or also a loom, through a withdrawal hole 9 approximately in the direction of the axis X , the yarn rotates around the front end of the yarn storage body D, and the yarn is controlled by the yarn brake B to generate a specific and substantially constant yarn tension.

A pivot bearing 3 may also be provided between the elongated arm 2 and the housing bracket at the top over a larger area than shown, so that the entire elongated arm 2 can rotate with the ring bracket R out of the way. Furthermore, the pivot bearing 3 can additionally be designed as a pivot bearing to move the ring support R out of the way, if necessary, also laterally from the axis X after turning. In addition, the pivot bearing 3 can be designed as a pull bearing, in which the ring support R can only be introduced into the threading position in the direction of the axis X. Another possibility is that the ring bracket, which is magnetically held in the operative position at any speed, is only hooked in the extension arm 2, and this hook connection is fully disengaged, and the ring bracket is removed.

In order to thread the yarn into the feeder F, a standard needle T is used, which is pushed through an inner tube 11 formed by the hollow initial part of the spool S forming the channel 10 and winding part, and the yarn is passed through it. Pull through. The end of the yarn is gripped by hand and passes through the yarn brake B into the extraction hole 9 when the ring support has moved into the threading position. Because in the threading position of the ring support R, the yarn storage body D is no longer fixed and does not rotate, so the rotation position can be adjusted, for example, for cleaning the yarn storage body or scanning area, and the new rotation position can be fixed for yarn storage Body D. After the yarn has been pulled through the withdrawal hole 9, the annular support R returns again to the operating position, in which it is magnetically fixed and prevents the storage body D in several possible rotations predetermined by positioning the permanent magnets P1, P2 One of the positions is co-rotated again. The yarn brake B will act on the initially loosely positioned yarn on the yarn storage body D. When the motor M is started, new coils are immediately wound onto the yarn storage body D, preventing the yarn resistance held by the yarn brake B, so that the yarn feeder F will again be quickly ready for standard operation.

Claims (8)

1. A yarn feeder (F), suitable for a knitting machine, comprising a housing (H) in which a yarn storage body (D) is rotatably positioned on a rotatably driven reel ( S) above; the permanent magnets (P1, P2) respectively assigned to the housing and the yarn storage body and oriented to each other, while magnetically cooperating and firmly supporting the yarn storage body to prevent it from co-rotating with the reel relative to the housing, and fixed to housing and on which is provided an elongated arm (2) of at least one annular support (R) with an annular yarn brake (B) operating concentrically with the storage body position interacts with the front end of the storage body to generate a contact pressure on the yarn brake relative to the storage body, the ring support (R) is adjusted between the operating position and The thread brake (B) is separated by the front end of the yarn storage body, characterized in that the permanent magnet (P2) assigned to the housing (H) is integrated in the ring support (R) with the thread brake (B) , in order to support the yarn storage body (D), the ring support (R) is supported by the elongated arm (2) in the rotation direction of the reel (S) relative to the housing (H), and the permanent magnet (P2) is used to To prevent co-rotation with the reel (S), the permanent magnet (P1) assigned to the storage body (D) is placed in its front end area, in the active position of the ring support (R), the permanent magnet (P1) assigned to the storage body (D) The magnet (P1) and the permanent magnet (P2) assigned to the ring support (R) in the housing are magnetically separated to release the free rotational movement of the storage body around the storage body axis (X) (H) The pivot bearing (3) of the extension arm (2) moves along the curved movement route between the operating position and the starting position, and the pivot bearing (3) is arranged on the extension arm (2) At one end, it comprises a pivot perpendicular to the axis (X) of the storage body (D), and positioning stops (6, 7) are arranged to define the operating position, in which the annular support (R) is passed between permanent magnets ( The magnetic force between P1, P2) is supported on positioning stops (6, 7). 2. According to the yarn feeder of claim 1, it is characterized in that the arm (8) with the extraction hole (9) is arranged on the ring support (R) and is designed as a kind of adjusting device of the ring support (R), For manual adjustment of the ring support (R) between the operating position and the working position respectively. 3. Yarn feeder according to claim 1, characterized in that the annular support (R) has the shape of a frustoconical ring (19, 20), at its small diameter end permanent magnets (P2) are placed in the form of rings, storing The free front end of the yarn body (D) supporting the permanent magnet (P1) has a frusto-conical shape. 4. Yarn feeder according to claim 1, characterized in that by placing the permanent magnets (P1, P2) at a preset angle relative to a sensor (21) mounted on the elongated arm (2) of the housing Placed inside the ring support (R) and the storage body (D), one or several static rotational positions of the storage body (D) around the storage body axis (X) are fixed. 5. Yarn feeder according to claim 3, characterized in that the free front end of the storage body (D) designed as a rod holder is formed by an insert (17) whose front side is in the Fixed on the yarn storage body (D), which is pot-shaped. 6. Yarn feeder according to the preceding claim 3, characterized in that the cone angle of the front end and the annular support (R) is between 60° and 75°. 7. Yarn feeder according to the preceding claim 1, characterized in that the hollow section of the spool (S) on the inlet side and the inner channel (11) of the winding part (W) are designed for the needles (T ) or a continuous conduction channel (10) for threading air flow (J). 8. Yarn feeder according to claim 7, characterized in that the threading air nozzle (N) introduced into the passage (10) is arranged at the entry-side end of the reel (S).

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