EP2878721A1 - Thread delivery device - Google Patents

Abstract

An inventive yarn feeding device (1) for supplying a thread (40) to a textile machine with a storage body (3) from which the thread (40) is withdrawn through the textile machine, and with a braking device for adjusting a thread tension of the thread (40) , which is arranged in the thread path after the storage body (3) provided. The brake device has a brake body (8) and an adjustment device for the brake body (8) which can be pressed against a clamping surface (10) at the discharge end of the storage body (3). The adjusting device is provided with a PM element (11) in an element housing (16) and with a working coil (12) which is movable in the magnetic field of the PM element (11) and which is arranged to act on the brake body (8). The adjustment device is provided with a discharge pipe (15) for the yarn (40) which extends through the work coil (12) and with an axially elastic centering unit. The centering unit is arranged in the region of the brake body (8) facing the end of the working coil (12). The centering unit is designed for centering the working coil (12). The adjusting device has a sealing unit, which is arranged between the brake body (8) and the centering unit.

Description

The invention relates to a yarn feeding device for supplying a yarn to a textile machine. The yarn feeding device is provided with a storage body, from which the yarn is withdrawn through the textile machine. Such a yarn feeding device is also called a storage yarn feeding device. The yarn feeding device has a braking device arranged in the yarn path after the storage body for adjusting a yarn tension of the yarn. The brake device comprises a brake body and an adjustment device for the brake body, wherein the brake body can be pressed by the adjusting device against a clamping surface at a discharge end of the storage body.

Subject of the EP 2 065 496 B1 is a yarn feeding device with a stationary storage body and with a yarn brake with a conical, resilient brake body, wherein the brake body is pressed by mutually repelling permanent magnet arrangements on the brake body and in a support against the discharge end of the storage body. The yarn feeding device has an adjusting device with a threaded screw device for adjusting the braking effect between the brake body and the discharge end, wherein the relative axial position of the permanent magnet assembly of the support is varied. The thread supply device comprises a quick adjustment device, by means of which the axial position of both the permanent magnet arrangement of the support and of the screw device is variable. The setting device with the thread screwing device and the quick setting device are operated by hand.

A special thread brake body with the shape of a regular truncated cone shell of thin-walled, at least radially elastic material on the basis of at least plastic and / or metal is in the WO 2006/045410 described. A brake zone of the brake body is defined by the inside of a continuous wall area between the small and large diameter ends of the brake body.

In the braking devices described below, an adjusting device for the brake body has at least two magnetic field generating magnetic elements, such as coils or permanent magnets, wherein a magnetic element acts on the brake body. A desired yarn tension is adjusted or changed by varying a working current of a magnetic element designed as a working coil.

The WO 2006/048053 A1 describes a yarn braking device for a yarn feeding device with a brake body which is pressed against a discharge end of a drum-shaped storage body, with an axial force generator with a pair of permanent magnets and with a centering device. The Axialkraftgenerator has an axial direction of action and the centering device on a radial effective direction between a stationary holder and the brake body. In one embodiment, the thread braking device comprises a coil which can be acted upon by current on or outside the brake body. The coil is functionally associated with one of the permanent magnets of the axial force generator, wherein an axial force superimposed on the auxiliary power can be generated via the coil.

In alternative braking devices, the adjusting device comprises a permanent magnet element, hereinafter referred to as PM element, and a working coil movable in the magnetic field of the PM element.

The EP 0 536 088 B1 relates to a modulated yarn brake for weft feeding devices, wherein the yarn feeding device comprises a fixed drum with a supply of thread. The thread brake comprises a brake body, which is supported by an elastic device frontally and coaxially with the drum and brought into elastic contact engagement against the drum. The brake body has a cylindrical portion with a coil extending into an annular gap of the collar of a permanent magnet. The brake body is supported by a plate of the elastic means surrounding the brake body, the plate being elastically deformable along an axial direction. The elasticity of the plate is obtained by a series of concentric undulations on the plate or by punched holes in the plate.

A brake body, which is provided on a cylindrical portion with a coil, is not or can not easily be replaced when worn. An elastic support plate for the brake body, which allows a centering of the brake body by its elasticity, and attached to the brake body coil are expensive to manufacture. Since the plate is to be mounted above the coil, the assembly is complicated. With a plate with punched openings, dirt could enter the annular gap and affect the function of the coil.

The EP 0 519 970 B1 describes a trigger brake system of a yarn feeding device, in which the thread can be withdrawn axially from a yarn storage body via a trigger channel. The trigger brake system has an abutment element disposed at the discharge end of the storage body and a clamping element with a clamping function for the Thread up. The abutment element and the clamping element form a disc brake, wherein the two elements of the disc brake are slightly damped by foamed plastic material.

In one embodiment, the clamping element is connected to an adjustment device called an actuating unit. The adjusting device comprises a magnetic member, e.g. a permanent magnet in an iron core and an axially movable coil, the coil receiving electrical control signals. The coil is called a speaker coil, also known as voice coil or voice coil formed. The clamping element engages in a designated as a thread support tube exhaust pipe for the thread. The thread support tube is held in two discs called membranes. The thread support tube is attached to a membrane by means of a scar and the other membrane directly, the coil is also attached to the scar. The membranes are clamped at their outer peripheries to a housing.

The use of two diaphragms which are internally fixed to the movable thread carrying tube, in which the clamping element engages, and on the outside of the housing, hinders the mobility of the coil. The disc brake described with damped elements and the actuator are expensive to manufacture and assemble.

The object of the invention is to develop a yarn feeding device with a storage body and with a braking device with a brake body and a movable working coil for adjusting a yarn tension by the arranged at the discharge end of the storage body brake body according to the preamble of claim 1, bei_dem the brake body with simple means well to center is. The mobility of the working coil should be ensured. The working coil should be protected against penetrating contamination.

The object is solved by the features of claim 1.

An inventive yarn feeding device for supplying a yarn to a textile machine is provided with a storage body, from which the yarn is withdrawn through the textile machine, and with a braking device for adjusting a yarn tension of the yarn. The braking device is arranged in the thread path after the storage body.

The brake device has a brake body and an adjustment device for the brake body. The brake body can be pressed by the adjusting device against a clamping surface at the discharge end of the storage body.

In one embodiment, the braking device is designed as a so-called cone brake with a conical brake body, wherein the brake body has the shape of a truncated cone shell. The clamping surface at the discharge end of the storage body is formed for example by the storage body. Alternatively, the clamping surface is formed by a clamping element at the discharge end of the storage body.

The adjusting device is provided with a permanent magnet element, hereinafter PM element, in an element housing, and with a working coil which is movable in the magnetic field of the PM element.

The work coil is arranged on the brake body acting. The work coil can be brought into contact with the brake body in such a way that a movement of the work coil and / or an action on the work coil with a force by the supply of a corresponding working current to the working coil affect the brake body. The brake body is pressed by the work coil stronger or less strongly against the clamping surface on the storage body.

The adjustment is provided with a drain pipe for the thread. The exhaust pipe extends through the working coil and, possibly up to installation tolerances, parallel to an axis of the storage body. It is attached to the element housing for the PM element or to a housing of the braking device.

The adjusting device is provided with an axially elastic centering unit for the braking device. The centering unit is arranged in the region of the brake body facing the end of the working coil.

The centering unit is designed for centering the working coil. The centering unit carries the working coil. For this purpose, the work coil is connected directly to the centering unit. The work coil acts, as described above, on the brake body. The work coil is not connected to the brake body. It is not or possibly only connected via the centering unit with the exhaust pipe.

The work coil held by the centering unit is movably arranged in an air space between the exhaust pipe and the PM element. For this purpose, the working coil is arranged in each case with a distance inwardly to the exhaust pipe and outside to the PM element, which allows a mobility of the working coil. The distance, ie an air gap, is in each case dimensioned such that a tilting of the working coil, for example of up to 5 °, preferably of up to 3 °, is possible.

A brake device in which the work coil is formed as a separate component which is attached to the centering unit is easy to assemble. Since the work coil acts only on the brake body and is not connected to the brake body, it is easily removable from the brake body. As a result, the brake body is free and can be replaced. That the brake body can be exchanged.

The braking device is also suitable for the use of a conical brake body. A conical brake body which can be pressed against the accumulator body has a larger diameter compared with discs of a disc brake and requires good centering. When installing the brake device in the yarn feeding device, an offset of the axis of the working coil to the axis of the storage body occur. This can be compensated by the centering unit, which in addition to the centering also allows tilting of the working coil.

The adjusting device has a sealing unit, which is arranged between the brake body and the centering unit. The sealing unit seals the air space in which the working coil is movable to the outside. The sealing unit prevents the ingress of dirt into the air space and allows undisturbed movement of the working coil. By the sealing unit is a deterioration of the function of the braking device, in which the working coil acts as an actuator, by contamination, for example by linting a running yarn, avoided. The functionality of the brake device is guaranteed for a long time. The sealing unit also ensures the undisturbed centering of the working coil and thus of the brake body.

In one embodiment, the sealing unit has at least one plate. The plate or plates are arranged between the brake body and the centering unit.

This arrangement of at least one plate in front of the disk allows a cover of the centering unit. The plate or plates, for example, terminate with the element housing or housing of the adjustment device.

The centering unit extends in a plane perpendicular to the axis of the working coil. It is provided with an opening for the exhaust pipe, wherein it is fixed in its radially outer or radially inner region and disposed freely movable in the other region. The working coil is connected in the region with the centering unit, in which the centering unit is freely movable,

In one embodiment, the centering unit is mounted in its radially outer region and arranged to be freely movable in its inner region. The centering unit is attached, for example, to the element housing or to the housing of the braking device.

In another embodiment, the centering unit is attached to its radially inner periphery and freely movable in the region of its outer periphery. The centering unit is attached to the exhaust pipe.

In one embodiment, the working coil comprises a coil holder with at least one contact element. The one or more contact elements are arranged acting on the brake body. The one or more contact elements protrude through openings in the centering unit and extend to the brake body. The effect of the working coil on the brake body via the contact elements of the bobbin holder. In one embodiment, the centering unit is connected to the coil holder in the region of the contact elements. The contact elements are designed as, for example, three contact pins.

The contact element or elements also protrude through openings in the plate or plates of the sealing unit. The openings for the contact elements are slightly larger than the outer contour of the contact elements. This ensures the desired axial mobility and tilting of the bobbin holder and thus of the working coil. The centering of the working coil is ensured by the centering unit.

In one embodiment, sealing elements are arranged in the region of the openings of each plate of the sealing unit. The sealing elements are close to the contact elements. They allow by their deformability an axial movement and tilting of the contact elements and thus the bobbin holder. By the sealing elements necessary for the contact elements openings in the or the plates are sealed.

In one embodiment, the sealing unit has two parallel plates, between which disk-shaped sealing elements are arranged in the region of the openings. The disc-shaped sealing elements are deformed and moved by a movement of the contact elements, wherein they are guided in their movement between the two plates. This allows a safe and durable seal for the work coil.

In one embodiment, the centering unit comprises a disc which is arranged perpendicular to the axis of the coil. The disc is made of thin solid material with a thickness of, for example, 0.5 mm. Alternatively, the disc is provided with radial slots or shaped like a spoked wheel.

In an alternative embodiment, the centering unit comprises at least three radial, i. arranged perpendicular to the axis of the coil, centering. The centering elements are designed as bands. Alternatively, the centering elements are provided with coil springs.

In one embodiment, the adjustment device comprises a biasing unit with a spring element. The spring element is arranged acting on the brake body. It is arranged, for example, on the housing, the element housing or the exhaust pipe.

The spring element is arranged in the installed state so that it has a certain output force, i. a bias on the brake body exerts. In operation, the force exerted on the brake body force is increased or decreased by the working coil, starting from this output force. The movement and / or force direction of the working coil is reversed, in which the polarity of the supplied working current is reversed. The current value for a given maximum force is at a suitable bias voltage only half as large as it would have to be chosen without bias. The working coil can thereby be operated with a lower maximum current. Their warming and associated problems are less.

In one embodiment, the spring element on the exhaust pipe and the coil holder is arranged vulnerable. The spring element is supported on the exhaust pipe.

In one embodiment, the brake device has an already mentioned housing. The housing is attached to a holder of the yarn feeding device.

In one embodiment, the element housing and the exhaust pipe can be positioned in a basic position. For positioning in the basic position of the distance between the Elemtentgehäuses and the exhaust pipe to the brake body is adjustable. For this purpose, the element housing and the exhaust pipe are attached, for example, at a variable distance to the housing,

In one embodiment, the adjustment device is configured as a replacement adjustment device. For this purpose, the element housing and the exhaust pipe are arranged to be axially displaceable in the housing from the basic position to an exchange position. This allows a lifting of the element housing and the exhaust pipe from the brake body, for replacement of the brake body, for example, during wear. In one embodiment, the element housing and the exhaust pipe are connected together.

In one embodiment, the adjustment device comprises a spring against the force of the element housing and the exhaust pipe are arranged together axially displaceable. The spring is for example a compression spring.

In one embodiment, the adjusting device in addition to a spring on a locking element, by which an axial distance of the element housing and the exhaust pipe is adjustable together to the housing and against the force of the spring. By the locking element, the element housing and the exhaust pipe and thus the adjustment is adjusted in its basic position.

In one embodiment, the element housing and the exhaust pipe are connected in two positions with the housing, for example in a kind of bayonet closure.

In one embodiment, the PM element is configured to generate a magnetic field with radial field lines. The PM element is formed, for example, by an annular element or by annular segments. The PM element has one or more magnets with a strong magnetic force. The magnet or magnets are made of, for example, a material containing rare earths such as neodymium.

In one embodiment, the adjustment device has iron core elements adjoining the PM element. The iron core elements are made of soft magnetic material.

In one example, the adjustment device comprises the following iron core elements: a shell element, a disc-shaped element and an annular element. The jacket element surrounds the PM element. The annular element is arranged in the interior of the PM element and surrounds the exhaust pipe. The disk-shaped element is connected to the jacket element and the annular element at their ends facing away from the storage body. Between the annular element and the PM element, an annular air space is formed, in which the working coil is arranged. The working coil, i. the bobbin holder having one or more windings of the working coil is also formed as an annular part. The distances between the working coil to the PM element and the iron core elements are so large that a small tilt of the working coil, for example, up to 3 °, to its own axis without touching other parts is possible.

In one embodiment, the iron core elements are formed by sections of the element housing. In an alternative embodiment, the annular element of the iron core elements are formed by the exhaust pipe and the disc-shaped element and the jacket element by the element housing.

The formation of the PM element as a ring magnet, which generates a radial magnetic field, allows a strong magnetic field in which the working coil moves. This makes it possible, with low working currents for the working coil, the desired thread tension adjust. Low working currents lead to less heating of the working coil and its environment and thus to more stable conditions.

In one embodiment, the element housing and the exhaust pipe are integrally formed as a holding part. The holding part is arranged axially movable in the housing of the braking device. The holding part is made of soft magnetic material. Such a holding part, together with the PM element, enables generation of a radial magnetic field for the working coil with simple means and simplifies formation of the adjusting device as an exchange adjusting device. The adjusting device is simply constructed by the holding part.

An inventive yarn feeding device is designed to supply a yarn to a knitting machine. The knitting machine is a circular knitting machine or a flat knitting machine. An inventive yarn feeding device is designed as an alternative to the supply of a weft thread to a loom.

• Fig. 1 eine schematische Darstellung anhand einer Seitenansicht eines erfindungsgemäßen Fadenliefergerätes mit einer Bremsvorrichtung mit einem Bremskörper;
• Fig. 2 eine schematische Darstellung der Bremsvorrichtung anhand eines Schnittes parallel zur Achse des Speicherkörpers des Fadenliefergerätes;
• Fig. 3a einen Schnitt parallel zur Achse des Speicherkörpers einer perspektivischen Darstellung der Bremsvorrichtung;
• Fig. 3b eine Detailvergrößerung der Figur 3a.

The invention will be further explained with reference to an example schematically illustrated in the drawing. Show it:

• Fig. 1 a schematic representation of a side view of a yarn feeding device according to the invention with a braking device with a brake body;
• Fig. 2 a schematic representation of the braking device based on a section parallel to the axis of the storage body of the yarn feeding device;
• Fig. 3a a section parallel to the axis of the storage body of a perspective view of the braking device;
• Fig. 3b an enlarged detail of the FIG. 3a ,

An inventive yarn feeding device 1 for supplying a thread 40 to a textile machine, which in the FIGS. 1 . 2 . 3a and 3b is designed as a storage yarn feeding device. The yarn feeding device 1 has a holder 2, a take-up unit, a storage body 3, from which a thread 40 is withdrawn through the textile machine, and a brake device for adjusting a thread tension. The thread 40 is only in FIG. 2 located. The textile machine is for example a circular knitting machine.

The holder 2 is provided with a fastening device 4 for fastening the yarn feeding device 1 to the textile machine, for example on a machine ring of the circular knitting machine.

The storage body 3 is formed as a storage drum having an axis 5. At the take-up end, in the figures at the right end, of the storage body 3, the take-up unit for winding yarn turns, i. Windings of the thread, arranged on the storage body 3. The take-up unit is provided with a drive arranged in a drive housing 6 and a driven by the drive Aufwickelement 7.

The holder 2 extends parallel to the axis 5 along the storage body 3. The drive housing 6 is attached to the take-up, in the figures at the right end of the storage body 3.

The brake device for adjusting a thread tension of the thread 40 has a brake body 8 and an adjustment device for the brake body 8. The braking device is arranged in the thread path after the storage body 3, wherein the brake body 8 on, in FIG. 2 schematically drawn, withdrawal end of the storage body 3 is arranged. A housing 9 of the braking device is attached to the actuator housing 6 opposite end of the storage body to the holder 2.

The Bremsköper 8 is conical, as a compliant brake body cone in the form of a regular truncated cone, formed. For example, it is made of a plastic and / or metal. Corresponding or similar brake bodies are, for example, in the aforementioned WO2006 / 045410A1 described.

The axis of the brake body 8 is substantially true, d. H. except for small deviations e.g. by lifting through the thread 40 or upon deformation of the elastic brake body 8, with the axis 5 of the storage body 3 match. The discharge end of the storage body 3 is rounded and forms in the region of the rounding an annular clamping surface 10. The brake body 8 protrudes with its larger diameter on the clamping surface 10. It is by the adjustment against the clamping surface 10 at the discharge end of the storage body 3 can be pressed.

When the thread 40 is pulled through the textile machine, the thread 40 runs from the storage body 3 through the gap between the withdrawal end of the storage body 3 and the brake body 8 via the clamping surface 10.

The adjusting device comprises a PM element 11 and a working coil 12 movable in the magnetic field of the PM element 11. The working coil 12 is arranged so that it acts on the brake body 8.

Upon contact with the brake body 8 causes an action on the working coil 12 with a certain working current to a possibly small, axial movement of the working coil and thus changing the contact pressure of the brake body 8 against the clamping surface 10. By changing the contact force, a desired yarn tension is set.

The brake body 8 is at its smaller diameter, d. H. provided at its end facing away from the storage body 3 end, with an inner ring 13 and with an outer ring 14. The inner ring 13 is funnel-shaped and has an inner funnel-shaped Fadenleitfläche 13 a. The outer ring 14 is provided with a collar. The inner ring 13 and the outer ring 14 are interconnected by snap-in connections.

The adjustment device has a drain pipe 15 and an element housing 16 for the PM element 11. The exhaust pipe 15 extends, possibly to installation tolerances, parallel to the axis 5. The exhaust pipe 15 leads the thread 40 from its the storage body 3 facing inlet end to its opposite outlet end by the adjustment of the braking device.

The element housing 16 is arranged in a region of the exhaust pipe 15 facing the accumulator body 3. It has a perpendicular to the axis 5 extending bottom portion 16 a, which is integrally formed on the exhaust pipe 15 in its central region, and extending around the axis 5 cylindrical shell portion 16 b, on which the PM element 11 is disposed on.

The working coil 12 comprises a coil holder 17, on which one or more windings of the working coil 12 are arranged and which acts on the brake body 8. The coil holder 17 can be brought into contact with the brake body 8.

The PM element 11 is formed as a cylindrical ring or hollow cylinder portion. Also, the work coil 12 with the coil holder 17 is formed as a cylindrical ring or hollow cylindrical portion. The movable working coil 12 is located substantially inside the PM element 11.

The exhaust pipe 15 has a thickening 15a in the region of the element housing 16. The working coil 12 is arranged in an annular air space of an opening 16c of the element housing 16, wherein the air space through the bottom portion 16a and the skirt portion 16b with the PM element 11 of the element housing 16 and the thickening 15a of the exhaust pipe 15 is limited. The working coil 12 is arranged axially movably in the opening 16c, ie it is arranged at a distance from the jacket section 16b. The working coil 12 is radially outwardly spaced from the PM element and radially inward arranged at a distance from the thickening 15a. These distances allow tilting of the working coil 12 by a maximum of 3 °.

The PM element 11 rests on an annular shoulder 16d of the inner circumferential surface of the jacket section 16b.

The adjusting device has a biasing unit with a spring element 18, wherein the spring element 18 is arranged to act on the brake body 8. For this purpose, the spring element 18 is arranged on the coil holder 17. By the spring element 18 is an output force on the coil holder 17, thus exercisable on the brake body 8 and through this on the clamping surface 10 on the thread 40.

The spring element 18 is designed as a cylindrical helical spring whose axis corresponds to the axis 5, if necessary, except for installation tolerances. The above-mentioned thickening 15a of the exhaust pipe 15 is provided in the region of the opening 16c with an open towards the storage body 3 annular opening 15b for receiving the spring element 18. The thickening 15a ends in the course of the spring element 18, so that the spring element 18 protrudes from the opening 15b.

The bobbin holder 17 has a cylindrical holder portion 17a, a cover portion 17b with a collar 17c and contact elements formed as contact pins 17d. The contact pins 17d are arranged on the brake body 8 can be acted upon. Windings of the working coil 12 are arranged on the cylindrical holder section 17a. The cover portion 17b protrudes radially inwardly over the spring element 18, wherein the spring element 18 terminates with its collar 17c.

The spring member 18, which is compressed in the installed state for exerting the output force, is in contact with the cover portion 17b within the collar 17c.

Starting from the cover section 17b, several, in this example, three, contact pins 17d extend in the direction of the storage body 3. In the Figures 2 and 3a, 3b only one contact pin 17d is visible, the other two are outside the cutting plane. The contact pins 17d act on the outer ring 14 of the brake body 8, ie they are in contact with a surface 5 extending perpendicular to the axis of the collar of the outer ring 14.

The adjusting device has an axially elastic centering unit for centering the working coil 12, which is designed as an axially elastic disc 19. The disc 19 is arranged in the region of the brake body 8 facing the end of the working coil 12.

Such a flexible disk 19 is also referred to as a membrane. The disc 19 has an opening for the exhaust pipe 15 and extends perpendicular to the axis fifth

The disc 19 is at its inner periphery, i. at the edge of the opening, attached to the exhaust pipe 15. In the region of its outer periphery, the disc 19 is arranged freely movable. It is made of an elastomer.

The disc 19 is connected in its outer region with the coil holder 17. The disc 19 centers the coil holder 17 with the windings and thus the working coil 12th

In this in the Figures 2 and 3a, 3b illustrated example, the disc 19 projects beyond the coil holder 17 at its outer edge. In an alternative embodiment, the disc 19 terminates at its outer periphery with the outer circumference of the spool holder 17. The disk 19 with the working coil 12 is arranged freely movable on its outer periphery.

In particular, the disc 19 is disposed on the cover portion 17 b of the bobbin holder 17. The disc 19 has, in addition to the central opening through which the exhaust pipe 15 protrudes, further, in this example, three openings through which the contact pins 17 d of the bobbin 17 protrude. The disc 19 is connected to the contact pins 17 d with the coil holder 17 and the working coil 12. The disc 19 is located in the region of the central opening on a shoulder 15 c of the exhaust pipe 15 and is fixed thereto. At its outer periphery, the disc 19 at a distance from the skirt portion 16b of the element housing 16 and thus, as mentioned, arranged to be freely movable. The disc 19 also centers the brake body 8 via the contact pins 17d.

The adjusting device has a sealing unit for the working coil 12, which is arranged between the disc 19 and the brake body 8. The sealing device comprises two parallel sealing plates 20, 21 and one or more sealing elements 22 between the sealing plates 20, 21. The sealing plates 20, 21 extend perpendicular to the axis 5 and are fixed to the exhaust pipe 15. They are arranged at a distance from the disc 19 and cover the element housing 16 from. The sealing plates 20, 21 have, in this example three, openings 20a, 21a, through which the contact pin 17d protrude, and a central opening 20b, 21b, through which the exhaust pipe 15 protrudes. There is a gap between the contact pins 17d and the edges of the corresponding openings 20a, 21a. The sealing plates 20, 21 are fixed to the exhaust pipe 15 in the area of the central openings 20b, 21b. The storage body 3 facing away from the sealing plate 21 is located with its outer edge on the edge of the shell portion 16b.

The, in this example three, sealing elements 22 are formed as disc-shaped elements and arranged between the cover plates 20, 21 in the region of the contact pins 17d. The sealing elements 22 each have an opening 22a corresponding to the circumference of the contact pins 17d. They are made of a deformable material, for example a felt, which closely surrounds the contact pins 17d. The sealing elements 22 are designed, for example, as round disks whose outer diameter is greater than that of the corresponding openings 20a, 20b of the cover plates 20, 21.

The adjusting device comprises a spacer cylinder 23 which surrounds the exhaust pipe 15 and is arranged between the disk 19 and the cover plate 21. The adjusting device further comprises a fastening element 24, for example a nut with an internal thread, which is screwed onto the threaded end of the exhaust pipe 15 provided with a corresponding thread. By the fastening element 24, the cover plates 20, 21, the sealing elements 22 and the disc 19 are fixed. There are a snap ring 25 on the contact pins 17 d, by which the disc 19 is fixed on the coil holder 17, and a spacer ring 26 between the cover plates 20, 21 are provided.

The adjusting device comprises at the inlet end of the exhaust pipe 15 an inlet eye 27 and at its outlet end an outlet eye 28 for the thread 40. The inlet eye 27 protrudes into the inner ring 13 of the brake body. 8

The adjusting device is provided with a locking ring 29, which, in this example three, has pipe sections for the contact pins 17d. The locking ring 29 is disposed between the outer ring 14 of the brake body 8 and the element housing 16 and inserted with its pipe sections on the contact pins 17 d and connected by latching connections with the contact pins 17 d.

The adjusting device is designed as a Austauscheinstellvorrichtung. The exhaust pipe 15 and the element housing 16 are connected to each other and formed together in the housing 9 axially displaceable. This allows these parts of the adjustment in a single axial stroke of the brake body 8, on which the inner ring 13 and the outer ring 14 are arranged, and thus deduct from the storage body 3.

In this example, the exhaust pipe 15 and element housing 16 are integrally formed as a holding element, wherein a portion of the holding element, the exhaust pipe 15 and an adjacent portion form the element housing 16.

To form the adjustment as Austauscheinstellvorrichtung it has a compression spring 30. The compression spring 30 is formed as a cylindrical coil spring, which is arranged in the outlet region on the exhaust pipe 15.

The housing 9 has a housing bottom 9a running perpendicular to the axis 5 and a housing jacket 9b. The housing jacket 9b is designed as a cylinder section extending around the axis 5. The housing jacket 9b surrounds the element housing 16 and projects beyond the jacket section 16b at the inlet end. The cover plates 20, 21 are thereby disposed within the housing shell 9b.

The housing jacket 9b also extends beyond the region of the exhaust pipe 15 facing away from the accumulator body 3, so that the bottom portion 16a of the element housing 16 and the housing bottom 9a are arranged at a distance from one another. Between the housing jacket 9b and the exhaust pipe 15, an annular cavity is formed, in which the compression spring 30 is arranged on the exhaust pipe 15.

The housing jacket 9b is fastened to the holder 2 over a specific radial area along its axial extent. The holder 2 forms starting from the housing shell 2b an electronic chamber (see. Fig. 2 ), are arranged in the electronic elements of the adjusting device, such as a power supply unit, for driving the working coil. In the FIGS. 1 . 2 and 3a this area can be seen above the housing 9. In the remaining radial region, the housing jacket 9b is provided with a radial, inwardly extending housing shoulder 9c. The housing shoulder 9c subdivides the annular cavity into a first section 31 with a larger diameter, which adjoins the section surrounding the element housing 16 in a straight line, and a second section 32 with a smaller diameter through the housing section 9c, which surrounds the compression spring 30. It is supported on the inlet side on the bottom portion 16a of the element housing 16 and on the outlet side on an inner surface of the housing bottom 9a.

The casing section 16b of the element housing 16 has at its inlet edge a ring collar 16e projecting toward the casing jacket 9b. In the region of the annular collar 16e, the housing jacket 9b is provided with, for example, three, distributed over the inner circumference of the element housing 16, extending in the axial direction ribs. The annular collar 16e and the ribs of the housing shell 9b serve to guide the element housing 16 and thus of the retaining element during axial movement in the housing jacket 9b. In the Figures 2 and 3a a rib can be seen at the top of the housing jacket 9b.

The housing bottom 9a is provided with an opening 9d, through which the exhaust pipe 15 protrudes and in which it is arranged axially displaceable. In the area outside the housing 9, an annular actuating element 33 is placed on the exhaust pipe 15. The actuating element 33 can be fixed with a locking pin 34 on the exhaust pipe 15. It has a contact surface 33a, which rests in a basic position on the outside of the housing bottom 9a. The basic position is the operating position, in which the working coil 12 is arranged to act on the brake body 8.

Due to the axial displaceability of the exhaust pipe 15 through the actuating element 33 and the locking of the actuating element 33 by means of the locking pin 34 on the exhaust pipe 15 is the holding element with the exhaust pipe 15 and element housing 16 with the PM element 11 and with the attached to the exhaust pipe 15 disc 19 can be positioned with coil holder 17 and coil of the working coil 12 and with the sealing unit in the basic position. The distance between the holding element and thus the adjusting device for the brake body 8 is adjusted against a force of the compression spring 33 by means of the locking pin 34. In the basic position, the compression spring 33 is possibly only slightly compressed. The holding element is axially displaceable together with the aforementioned parts on the actuating element 33 against the compression spring 30 in the outlet direction and thus from the brake body 8, on which the inner ring 13 and the outer ring 14 are arranged, can be lifted. This allows a quick replacement of the brake body 8 with the inner ring 13 and the outer ring 14th

The PM element 11 is made of a material that generates a strong magnetic force. The material of the PM element contains rare earths, for example neodymium. The PM element 11 is radially magnetized with respect to the axis 5, i. it forms radial magnetic field lines.

The holding member constituting the exhaust pipe 15 and the element housing 16 is made of a soft magnetic material such as iron.

The exhaust pipe 15 in the region of the element housing 16 with its thickening 15a, the bottom portion 16a and the shell portion 16b form iron core elements through which close the radial magnetic field lines emanating from the PM element 11. In the annular air space of the opening 16c between the PM element 11 and the thickening 15a of the exhaust pipe 15, as mentioned, the working coil 12 is disposed axially movable and tiltable. It works on the principle of a plunger, also called "voice coil".

In operation, the thread 40 is supplied from the yarn feeding device 1 to the textile machine by the thread 40 is withdrawn through the textile machine from the storage body 3 of the yarn feeding device 1. A thread tension of the thread 40 is set in the course of the thread after the storage body 3 by the braking device by the brake body 8 is pressed against the clamping surface 10 at the discharge end of the storage body 3.

A magnetic element of the adjusting device, namely the working coil 12, which is movable in the magnetic field of the other magnetic element, the permanent magnet element 11, acts on the brake body 8. A thread tension is adjusted by adjusting a working current of the working coil 12. LIST OF REFERENCE NUMBERS 1 Yarn feeder 29 lock ring 2 holder 29a Pipe section of the lock ring 3 storage body 30 compression spring 4 fastening device 31 first section 5 axis 32 second part 6 drive housing 33 actuator 7 takeup 33a contact surface 8th Brakes 34 locking pin 9 casing 40 thread 9a caseback 9b housing jacket 9c housing shoulder 9d housing opening 10 clamping surface 11 PM-element 12 working coil 13 inner ring 13a yarn guide 14 outer ring 15 exhaust pipe 15a thickening 15b opening 15c paragraph 16 element housing 16a bottom section 16b shell section 16c opening 16d paragraph 16e gorget 17 spool holder 17a holder section 17b cover 17c Federation 17d contact pins 18 spring element 19 centering 20 sealing 20a Opening for contact pin 17d 20b Opening for exhaust pipe 15 21 sealing 21a Opening for contact pin 17d 21b Opening for exhaust pipe 15 22 sealing element 22a opening 23 spacer cylinders 24 fastener 25 snap ring 26 spacer 27 Inlet eyelet 28 Discontinued eyelet

Claims (14)

Yarn feeding device (1) for supplying a thread (40) to a textile machine,
with a storage body (3) from which the thread (40) is withdrawn through the textile machine,
with a braking device for adjusting a thread tension of the thread (40), which is arranged in the thread path after the storage body (3),
wherein the brake device has a brake body (8) and an adjustment device for the brake body (8),
wherein the brake body (8) can be pressed by the adjusting device against a clamping surface (10) at the discharge end of the storage body (3),
the adjusting device
with a PM element (11) in an element housing (16),
with a working coil (12) which is movable in the magnetic field of the PM element (11) and which is arranged so that it can act on the brake body (8),
with a discharge pipe (15) for the thread (40) extending through the working coil (12), and
with an axially elastic centering unit, which is arranged in the region of the brake body (8) facing the end of the working coil (12), characterized
that the centering unit is designed for centering the working coil (12) and
the adjusting device has a sealing unit which is arranged between the brake body (8) and the centering unit. Yarn feeding device according to claim 1, characterized in that the sealing unit has at least one plate (20, 21). Yarn feeding device according to claim 1 or 2, characterized in that the centering unit is attached to the exhaust pipe (15). Yarn feeding device according to claim 1 or 2, characterized in that the working coil (12) comprises a bobbin holder (17) and the centering unit is connected to the bobbin holder (17). Yarn feeding device according to claim 3 or 4, characterized in that at least one contact element (17d) of the bobbin holder (17) on the brake body (8) is arranged to be operative, each of the contact elements (17d) through an opening in the centering unit and through openings (20a , 20b) in the plate or plates (20, 21). Yarn feeding device according to claim 5, characterized in that deformable sealing elements (22) in the region of the openings (20a, 21 b) of each plate (20, 21) of the sealing unit are arranged. Yarn feeding device according to claim 5 or 6, characterized in that the sealing unit comprises two parallel plates (20, 21), between which in the region of the openings (20a, 21a) deformable disc-shaped sealing elements (22) are arranged. Yarn feeding device according to one of claims 1 to 7, characterized in that the centering unit comprises a disc (19). Yarn feeding device according to one of claims 1 to 8, characterized in that the adjusting device comprises a biasing unit with a spring element (18), wherein the spring element (18) on the brake body (8) is arranged to be operative. Yarn feeding device according to claim 9, characterized in that the spring element (18) on the exhaust pipe (15) supporting and on the coil holder (17) is arranged to be operative. Yarn feeding device according to one of claims 1 to 10, characterized in that the braking device comprises a housing (9) fastened to a holder (2) of the yarn feeding device (1), wherein the element casing (16) and the discharge pipe (15) in the casing (15). 9) are positionable in a basic position. Yarn feeding device according to one of claims 1 to 11, characterized in that the braking device comprises a on a holder (2) of the yarn feeding device (1) fixed housing (9), wherein the element housing (16) and the exhaust pipe (15) together in the housing (9) are arranged axially displaceable. Yarn feeding device according to one of claims 1 to 12, characterized in that the PM element (11) is adapted to generate a magnetic field with radial field lines. Yarn feeding device according to one of claims 1 to 13, characterized in that the element housing (16) and the exhaust pipe (15) are integrally formed as a holding part.

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