TWI810939B - Yarn feeder - Google Patents

Abstract

A yarn feeder (1) for feeding a yarn (40) to a textile machine is provided with a housing (2) having a holder (2a), with a storage body (3) from which the yarn (40) is drawn off by the textile machine, and with a braking device for adjusting a yarn tension of the yarn (40). The braking device has a brake body (8) and an adjusting device for the brake body, wherein the brake body (8) can be pressed by the adjusting device against a clamping surface (3a) at the take-off end of the storage body (3). The adjusting device comprises at least one adjustment element and at least one outlet element, wherein the adjustment element is designed to be axially movable with respect to the holder (2a), and wherein the outlet element is provided with an inlet opening aligned with the brake body for guiding the yarn (40) coming from the brake body (8) in the direction of the textile machine.

A cover element is provided at the take-off end of the storage body (3). The cover element is provided with a guide surface for guiding a threading needle coming from the outlet element to the brake body. The guide surface has an elevation, the tip of which is asymmetrical or the highest region of which is arranged in the region of the edge of the projection of the inlet opening onto the cover element and is located at a position opposite an exit direction (R) of the threading needle.

Description

yarn feeder

This invention relates to a yarn feeder for feeding yarn to a textile machine.

The yarn feeder is provided with a storage body from which the yarn is drawn out by the textile machine. This yarn feeder is also called storage yarn feeder. The yarn feeder has a braking device arranged in the yarn path downstream of the storage body for adjusting the yarn tension of the yarn. The brake device includes a brake body and an adjustment device for the brake body.

Such a yarn feeder is described, for example, in EP 3 296 242 B1. The brake body is designed as a flexible brake body cone with a regular truncated cone surface. After the yarn breaks, the operation is interrupted in order to tie the yarn ends again. One of the yarn ends passes through the adjusting device and the brake body to the storage body, or vice versa from the storage body through the brake body and the adjustment device. For example, flexible threading needles are used for this purpose.

DE 29 32 782 C2 describes a guide rail for threading needles, which guide rail is formed by guide blocks and spokes. The threading needle can be pushed through from the feed side or from the take-out side.

Instead of using a threading needle, EP 0 370 066 uses a pneumatic system.

DE 100 54 103 describes a threading channel which can be used mechanically or pneumatically with a threading needle.

The object of the present invention is to improve the yarn feeder in such a way that simple threading with a threading needle is possible. This improvement is simple and space saving in design.

Another object is to design the threading aid in such a way that the exit direction of the threading needle, ie the radial exit, can be predetermined.

This object is achieved by the features of the claims.

According to the invention, a yarn feeder for feeding yarn to a textile machine is provided with a housing with a holder, with a storage body from which the yarn is drawn by the textile machine, and with a device for adjusting the yarn Yarn tension braking device. The braking device is arranged after the storage body in the yarn path. The brake device has a brake body and an adjustment device for the brake body. The brake body can be pressed against the clamping surface at the withdrawal end of the storage body by means of adjustment means.

In one embodiment, the brake body is designed as a brake ring. In an embodiment, the braking ring is provided with elastic elements which can be pressed against the clamping surface. In one embodiment, the brake body is designed as a brake cone. In one embodiment, the braking body system is made of elastic material.

In one embodiment, the braking body system is formed as an elastic braking body cone in the form of a regular truncated cone surface, wherein the braking body is pressed against in the region of its larger diameter by adjustment means at the withdrawal end of the storage body against the clamping surface and in the area of its smaller diameter is connected to the adjustment device.

The adjustment device is configured on the holder extending along the storage body of the casing. The adjusting device comprises at least one adjusting element and at least one outlet element.

The adjustment element is designed to be axially movable relative to the holder to press the brake body against the clamping surface.

The outlet element is provided with an inlet opening aligned with the brake body for guiding the yarn from the brake body in the direction of the textile machine.

The cover element is arranged at the take-out end of the storage body. The cover element is formed with a guide surface for guiding the threading needle from the outlet element. The guide surface has an elevation, the tip of which is arranged asymmetrically in the edge region of the projection to the inlet opening on the cover element. The tip of the raised portion is located at a position opposite to the exit direction of the threading needle. The direction of this exit is predetermined. The projection of the inlet opening onto the cover element is defined as a circular area on the cover element where contact is made with a threading needle pushed through the inlet opening by the outlet member. With an inlet opening of constant diameter, the circular area becomes larger the farther the inlet opening is from the cover element and the lower the height of the outlet element, eg the outlet element is cylindrical.

The asymmetric configuration of the tip of the raised portion of the guide surface is related to the body axis of the storage body. The outlet member is substantially concentric with the body axis.

In one embodiment, the outlet direction is provided on the side facing away from the holder of the housing. The tip of the raised portion of the guide surface is attached to one side of the holder.

In order to join the two yarn ends of the broken yarn, the threading needle is guided past the outlet element. The needle emerges from the inlet opening and contacts the guide surface of the cover element. The threading needle is deflected with the guide surface in the exit direction. In the exit direction, it is directed outwards between the withdrawal end of the storage body and the braking body. There, the yarn end of the guide yarn deposited on the storage body is inserted into the threading needle. The threading needle is drawn back through the outlet element together with the entrained yarn end. Outside the outlet element, the yarn ends are joined together.

In one embodiment, the raised portion of the guide surface is formed as a cone. The cone system is offset relative to the exit direction.

In one embodiment, the raised portion of the guide surface is formed as an asymmetrical conical surface. Starting from the tip, the guide surface has a steeper slope on one side and a flatter slope on the other side. Starting from a steeper slope with a correspondingly smaller radius, the slope on the circumference of the guide surface changes continuously to a flatter slope with a larger radius. The side with the flatter slope is oriented in the exit direction. Designing the guide surface as an asymmetrical conical surface has the advantage that a tip with a smaller height is required compared to a symmetrical cone.

In an embodiment, the raised portion of the guide surface has a concave curved surface portion. The concave form of the guide surface has the advantage that the slope of the guide surface tapers off at its edges and ends up almost parallel to the surface merging into the clamping surface. At the withdrawal end where the cover element transitions into the storage body, the guidance of the threading needle is thus improved.

In one embodiment, the guide surface of the cover element has a flattened tip. In other words, the guide surface has the highest area, which is formed, for example, by raised portions. The raised portion can be round or oval.

In one embodiment, the tip or highest region itself may be asymmetric.

In one embodiment, the plate is provided with markings.

In one embodiment, the cover element is formed as a circular plate whose diameter is 20% to 80% of the diameter of the storage body.

In one embodiment, the height of the raised portion of the guide surface is 5% to 20% of the diameter of the storage body.

In an embodiment, the cover element has elements for fastening to the storage body. In one embodiment, the element for fastening comprises a collar with detent elements. In one embodiment, the collar comprises fitting elements. This assembly component determines the mounting orientation.

In one embodiment, the cover element is made of plastic or metal.

In one embodiment, the cover element is produced by injection molding or deep drawing.

The yarn feeder according to the invention is designed to feed yarn to a knitting machine. The knitting machine is a circular knitting machine or a flat knitting machine. The yarn feeder system according to the invention can also be designed to supply weft yarn to shuttle looms.

1: yarn feeder

2: shell

2a: Holder

2b: Drive shell

3: Store the body

3a: clamping surface

3b: opening

4: fastening device

5: Winding components

5a: Yarn guiding element

6: swing body

8: Brake body

10: inner ring

11: outer ring

12: Take out the flower tube

13: Entrance hook and eye

14: Export hook and eye

15: Lower ring

20: board

21: Collar

21a: Detent element

21b: Collar element

30: board

31: Collar

31a: Detent element

31b: Collar element

40: Yarn

W: Shaft

L: Bearing

S: fastening element

K: body axis

R: exit direction

PT: Path of the tip of the threading needle

P1: permanent magnet

P2: permanent magnet

T: tip

P: high rise

M: mark

N: lug

The invention is further explained with reference to an example schematically shown in the accompanying drawings, in which: Figure 1 shows a schematic diagram based on a side view of a yarn feeder according to the invention, which is shown as a zone parallel to the axis of the storage body in the area of the braking device section, and wherein the tip of the threading needle is drawn along the path of the cover element of the first example and the progress of the yarn; Fig. 2 shows a perspective view of the cover element of the first example; Fig. 3 shows a plan view of the cover element of the first example and Section A-A, section D-D and section C-C; FIG. 4 shows a view from below the cover element and section E-E, which is offset by about 45° relative to section A-A; FIG. 5 shows a plan view of the cover element of a second example, and corresponds to FIG. 3 Sections A-A, D-D and C-C of those of .

The yarn feeder 1 shown in FIG. 1 for feeding yarn 40 to a textile machine is designed as a storage yarn feeder.

The yarn feeder 1 has a housing 2 and a storage device with a storage body 3 from which yarn 40 is drawn by the textile machine. The textile machine is, for example, a circular knitting machine.

The housing 2 includes a holder 2a and a driving housing 2b. The holder 2a is provided with fastening means 4 for fastening the yarn feeder 1 to a mechanical ring of a textile machine, for example to a circular knitting machine.

The yarn feeder 1 has a drivable shaft W in the region of the braking device, which can be seen in FIG. 1 , and the storage body 3 is arranged on the shaft W via a bearing L . The shaft W is rotatably installed relative to the storage body 3 . The storage body 3 is fixed to the casing 2 . The body axis K of the storage body 3 , which substantially corresponds to the axis of the shaft W, is indicated by a chain line in FIG. 1 . The drive device for the shaft W, which is not visible in the drawing, is arranged in the drive housing 2b.

The holder 2 a of the housing 2 extends parallel to the shaft W along the storage body 3 . The storage body 3 is formed as a storage drum with a body axis K which is parallel to the axis of the shaft W and, as mentioned, substantially corresponds thereto. The storage body 3 is rounded at its withdrawal end, ie the lower end in FIG. 1 , to form a clamping surface 3 a. It has an opening 3b at the withdrawal end. The fastening element S arranged on the shaft W can enter and exit through the opening 3b. In this example, the opening 3b is provided with a raised edge.

At the winding end of the storage body 3, at the top in FIG. 1, the winding element 5 is provided with a yarn guide element 5a for winding the yarn 40 onto the storage body 3 of the storage device. Yarns 40 not shown at this moment in FIG. 1 are sequentially wound onto the storage body 3 , which are called yarns or coils.

In addition to the storage body 3 , the storage device includes a swing body 6 disposed inside the storage body 3 .

The brake device for adjusting the yarn tension of the yarn 40 has a brake body 8 and an adjustment device for the brake body 8 . The brake device is arranged in the yarn path downstream of the storage body 3 , wherein the brake body 8 is arranged at the take-out end of the storage body 3 .

The braking body 8 is conical, in particular a flexible braking body cone in the form of a regular frusto-conical surface. It is produced eg from plastic and/or metal. Corresponding or similar brake body systems are described, for example, in WO 2006/045410 A1.

The axis of the braking body 8 substantially matches the body axis K of the storage body 3 , ie apart from slight deviations, for example due to the lifting by the yarn 40 or the deformation of the elastic braking body 8 . The braking body 8 protrudes with its larger diameter above the clamping surface 3a. It can be pressed against the clamping surface 3a at the withdrawal end of the storage body 3 by means of adjustment means.

When the yarn 40 is drawn out by the textile machine, the yarn 40 extends from the storage body 3 via the clamping surface 3 a between the withdrawal end of the storage body 3 and the braking body 8 .

The adjustment device comprises an adjustment unit with at least one adjustment element and an outlet unit with at least one outlet element.

The adjustment unit has a holder for the brake body 8 with an inner ring 10 and an outer ring 11 which is arranged on the smaller diameter of the brake body, ie on its end pointing away from the storage body 3 . The inner ring 10 and the outer ring 11 are connected to each other by detent connectors.

The outlet unit comprises a take-out fountain 12 provided with an inlet hook 13 at its end facing the storage body 3 and with an outlet hook 14 at its opposite end. The outlet unit protrudes into the holder inner ring 10 of the brake body 8 with an inlet hook eye 13 . The extraction fountain 12 extends parallel to the axis K, within installation tolerances where applicable. During operation, the take-out fountain 12 guides the yarn 40 from its inlet end facing the storage body 3 through the inlet hook eye 13 to its opposite outlet end through the outlet hook eye 14, ie through the adjustment means. The take-out fountain tube 12 is disposed on the holder 2 a of the casing 2 .

In the example shown, the adjustment unit comprises a permanent magnet arrangement of an upper ring with permanent magnets P1 and a lower ring 15 with permanent magnets P2. The upper ring is the outer ring 11 formed as a holder for the brake body 8 . Down The ring 15 is arranged on the outside of the extraction fountain 12 via a threaded connection and is designed to move axially by manual rotation. The lower ring 15 forms an adjustment element designed to be axially movable relative to the holder 2a in order to press the brake body 8 against the clamping surface 3a.

The cover element of the first example is provided at the extraction end of the storage body 3 .

Figure 1 shows the path PT of the tip of the threading needle, where the point at which this path PT exits (yarn feeder) is relative to the holder 2a. When the cover element is installed, the outlet direction R points away from the holder 2a. This exit direction R is shown as an arrow in the plan view of FIG. 3 .

The cover element is shown in FIGS. 2 , 3 and 4 . Figure 2 shows a perspective view of the cover element.

3 shows a plan view of the cover element of the first example and a section A-A arranged below the plan view, a section D-D arranged on the left side of the plan view, and a section C-C arranged on the right side of the plan view.

Draw the directions of sections A-A, D-D, and C-C in the plan view. Section A-A passes through the tip S of the guide surface and a center point not shown, i.e. in the exit direction R; section D-D passes through the center point and is perpendicular to exit direction R; and section C-C is parallel to section D-D towards the tip S bias.

Figure 4 shows a view from below the cover element and a section E-E offset by approximately 45° from section A-A.

The cover element has a circular plate 20 and elements for fastening. The element for fastening has a collar 21 with a detent element 21a and a collar element 21b. The detent elements 21a are used alternately with the collar elements 21b. The diameter of the collar 21 corresponds to the diameter of the opening 3 b at the withdrawal end of the storage body 3 . The detent element 21a holds the cover element in the opening 3b.

The plate 20 in this example is shaped as a guide surface. The guide surface is formed as an asymmetrical conical surface having a concavely curved surface portion.

The elevation of the guide surface has a tip which is arranged asymmetrically onto the cover element in the edge region of the protrusion of the inlet opening of the inlet hook eye 13 . The tip sits on one side of the holder 2a, ie at a point opposite to the exit direction R of the threading needle.

The section shows the concave surface part. The portion of the surface pointing from the tip T in the direction of the outlet is concave.

The plate 20 is provided with a marking M on its upper side and on the side opposite to the outlet direction R. As shown in FIG. Marking M makes installation easy.

The collar 21 is provided with fitting elements. In this example, the collar element 21b located below the mark M has a lug N protruding outward. The opening 3b has a recess corresponding to the lug N. As shown in FIG.

The plate 20 of the cover element has a diameter that is 20% to 80% of the diameter of the storage body 3 . In this example, the diameter of the plate 20 is about 60% of the diameter of the storage body 3 . The height of the raised portion of the guide surface is 5% to 20% of the diameter of the storage body 3 . In this example, this height is approximately 10% of the diameter of the storage body 3 . The cover element is made of plastic through an injection molding process.

In order to engage the yarn end of the broken yarn 40, the threading needle is pushed through the outlet hook eye 14, the withdrawal fountain 12 and the inlet hook eye 13 to the plate 20 of the cover element forming the guide surface and towards The outer guide passes the guide surface. This is outlined in Figure 2. The dashed lines mark the progress of the yarn 40 once the yarn ends have been joined.

In an alternative, the elevation of the guide surface of the plate is formed as a symmetrical cone arranged offset with respect to the outlet direction. The tip of the cone is arranged asymmetrically on the cover element in the edge region of the protrusion of the inlet opening.

FIG. 5 shows a plan view of a cover element of a second example and sections A-A, D-D and C-C corresponding to those of FIG. 3 .

A second example of a cover element can be seen in FIG. 5 . It corresponds to the first example except for the following features. The cover element of the second example also has a circular plate 30 and elements for fastening. The element for fastening has a collar 31 with a detent element 31a and a collar element 31b. The detent elements 31a are used alternately with the collar elements 31b.

The plate 30 is shaped as a guide surface. The guide surface is formed as an asymmetrical elliptical conical surface with a flattened tip, and has a concavely curved surface portion. The raised portion of the guide surface has the highest area formed by the elliptical raised portion. The elevations are formed symmetrically and are arranged asymmetrically onto the cover element in the edge region of the protrusion of the inlet opening of the inlet hook eye 13 . This raised portion sits on one side of the holder 2a, ie at a point opposite to the exit direction R of the threading needle.

20: board

21: Collar

21a: Detent element

21b: Collar element

T: tip

M: mark

Claims (10)

A yarn feeder (1) for feeding yarn (40) to a textile machine, comprising: a housing (2) with a holder (2a), a storage body (3) from which the yarn (40) is drawn by the loom, A braking device for adjusting the yarn tension of the yarn (40), the braking device is arranged downstream of the storage body (3) in the yarn path, wherein the braking device has a braking body (8) and An adjustment device for the brake body, wherein the brake body (8) can be pressed against a clamping surface (3a) at the withdrawal end of the storage body (3) by means of the adjustment device, wherein the adjustment device is configured On the holder (2a) extending along the storage body (3), wherein the adjustment device comprises at least one adjustment element and at least one outlet element, wherein the adjustment element is designed to be axially relative to the holder (2a) ground to press the brake body (8) against the clamping surface (3a), and wherein the outlet element is provided with an inlet opening aligned with the brake body for feeding from the brake body ( 8) the yarn (40) is guided in the direction of the textile machine, A cover element is provided at the withdrawal end of the storage body (3), wherein the cover element is provided with a guide surface for guiding a threading needle from the outlet element to the brake body (8), wherein the guide The guide surface has a raised portion, the tip of which, or its highest region, is arranged asymmetrically to the cover element in the edge region of the protrusion of the inlet opening and is situated in an exit direction (R ) relative to a position. The yarn feeder as claimed in claim 1, wherein the raised portion of the guide surface is formed as a symmetrical cone. The yarn feeder as claimed in claim 1 or 2, wherein the raised portion of the guide surface is designed as an asymmetrical conical surface. The yarn feeder as claimed in claim 1 or 2, wherein the raised portion of the guide surface has a concavely curved surface portion. Yarn feeder according to claim 1 or 2, wherein the cover element is formed as a circular plate (20, 30) whose diameter is 20% to 80% of the diameter of the storage body (3). The yarn feeder according to claim 1 or 2, wherein the height of the raised portion of the guide surface is 5% to 20% of the diameter of the storage body (3). Yarn feeder according to claim 1 or 2, wherein the cover element has elements for fastening to the storage body (3). Yarn feeder according to claim 7, wherein the element for fastening has a collar (21, 31) with a detent element (21a, 31a). The yarn feeder as claimed in claim 1 or 2, wherein the cover element is made of plastic or metal. The yarn feeder according to claim 1 or 2, wherein the cover element is made by injection molding or deep drawing.