Wire feeding equipment

Abstract

A yarn feeding device (1) for feeding a yarn (40) to a textile machine is provided with: a housing (2) with a bracket (2a); a storage body (3) from which the yarn (40) is withdrawn by the textile machine; and a braking device for adjusting the yarn tension of the yarn (40). The braking device has a brake body (8) and an adjusting mechanism 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 the adjusting mechanism. The adjusting mechanism includes at least one adjusting element and at least one feeding element, wherein the adjusting element is configured to be axially movable with respect to the bracket (2a), and wherein the feeding element is provided with a feeding opening oriented towards the brake body, and the feeding opening is used to guide the yarn (40) from the brake body (8) towards the textile machine. A covering element is provided at the withdrawal end of the storage body (3). The covering element is provided with a guiding surface for guiding the threading needle from the feeding element to the brake body. The guiding surface has a protrusion, and the tip of the protrusion is arranged asymmetrically, or its highest area is arranged in the area of the projection of the feeding opening onto the covering element and at a position opposite to the extending direction (R) of the threading needle.

Description

Technical Field

[0001] The present invention relates to a yarn feeding device for feeding yarn to a textile machine. Background Art

[0002] The yarn feeding device is provided with a storage body, and the textile machine withdraws the yarn from the storage body. Such a yarn feeding device is also called a storage type yarn feeding device. The yarn feeding device has a braking device arranged behind the storage body in the yarn running direction for adjusting the yarn tension of the yarn. The braking device includes a braking body and an adjusting mechanism for the braking body.

[0003] Such a yarn feeding device is illustrated, for example, in EP 3296242 B1. The braking body is configured as a soft braking body cone in the form of a regular truncated cone shell. After the yarn is broken, the operation is interrupted for tying a knot to the yarn end again. One of the yarn ends is threaded through the adjusting mechanism and the braking body all the way to the storage body or vice versa from the storage body through the braking body and the adjusting mechanism. For this purpose, a flexible threading needle is used, for example.

[0004] DE 2932782 C2 illustrates a guide rail for a threading needle, which is formed by guide blocks and spokes. The threading needle can be inserted from the feeding side or the pulling side.

[0005] Instead of using a threading needle, a pneumatic system is used in EP0370066.

[0006] DE 10054103 illustrates a threading channel, which can be used mechanically with a threading needle or pneumatically. Summary of the Invention

[0007] The object of the present invention is to improve a yarn feeding device such that easy threading can be performed with a threading needle. The improvement should be constructed easily and space-savingly.

[0008] Another object is to construct a threading aid such that the protruding direction of the threading needle, i.e., the radial outlet, can be predetermined.

[0009] The object is solved by a yarn feeding device for feeding yarn to a textile machine.

[0010] The yarn feeding device for feeding yarn to a textile machine according to the present invention is provided with: a housing with a support; a storage body from which the textile machine withdraws the yarn; and a braking device for adjusting the yarn tension of the yarn. The braking device is arranged behind the storage body during the running of the yarn. The braking device has a braking body and an adjusting mechanism for the braking body, and the braking body can be pressed against a clamping surface on the extraction end of the storage body by the adjusting mechanism. Wherein the adjusting mechanism is arranged on the support, the support extends along the storage body, wherein the adjusting mechanism includes at least one adjusting element and at least one feeding element, wherein the adjusting element is configured to be axially movable with respect to the support for pressing the braking body against the clamping surface, and wherein the feeding element is provided with a feeding opening directed towards the braking body, and the feeding opening is used for guiding the yarn from the braking body towards the textile machine. According to the present invention, a covering element is provided at the extraction end of the storage body, wherein the covering element is provided with a guiding surface for guiding the threading needle from the feeding element to the braking body, wherein the guiding surface has a protrusion, and the tip or its highest region of the protrusion is asymmetrically arranged in the region of the edge of the projection of the feeding opening on the covering element and is in a position opposite to the extending direction of the threading needle.

[0011] In one embodiment, the braking body is configured as a braking ring. In one embodiment, the braking ring is provided with an elastic element that can be pressed against the clamping surface. In one embodiment, the braking body is configured as a braking cone. In one embodiment, the braking body is made of an elastic material.

[0012] In one embodiment, the braking body is configured as a soft braking body cone in the form of a regular truncated cone housing, wherein the braking body is pressed against the clamping surface on the extraction end of the storage body in the region of its larger diameter by the adjusting mechanism and is connected to the adjusting mechanism in the region of its smaller diameter.

[0013] As described above, the adjusting mechanism is arranged on the support of the housing that extends along the storage body. The adjusting mechanism includes at least one adjusting element and at least one feeding element.

[0014] The adjusting element is configured to be axially movable with respect to the support for pressing the braking body against the clamping surface.

[0015] The feeding element is provided with a feeding opening directed towards the braking body, and the feeding opening is used for guiding the yarn from the braking body towards the textile machine.

[0016] A covering element is provided at the extraction end of the storage body. The covering element is configured with a guiding surface for guiding the yarn threading needle from the feeding element. The guiding surface has a protrusion, and the tip of the protrusion is asymmetrically arranged in the region of the edge of the projection of the feeding opening onto the covering element. The tip of the protrusion is in a position opposite to the extending direction of the yarn threading needle. The extending direction is predefined. The circular area on the covering element is defined as the projection of the feeding opening onto the covering element, and the yarn threading needle pushed through the feeding opening by the feeding element touches the circular area. When the diameter of the feeding opening is the same, the farther the feeding opening is from the covering element and the smaller the height of the feeding element such as a cylindrical one, the larger the circular area is.

[0017] The asymmetric arrangement of the tip of the protrusion of the guiding surface relates to the body axis of the storage body. The feeding element is oriented substantially concentrically with the body axis.

[0018] In one embodiment, the extending direction is provided on the side facing away from the bracket of the housing. The tip of the protrusion of the guiding surface is on the bracket side.

[0019] To connect the two ends of the broken yarn, the yarn threading needle is guided through the feeding element. The yarn threading needle extends from the feeding opening and touches the guiding surface of the covering element. The yarn threading needle turns on the guiding surface in the extending direction. Along the extending direction, the yarn threading needle is guided outwards through the space between the extraction end of the storage body and the braking body. There, the end of the wound yarn laid on the storage body is inserted into the yarn threading needle. The yarn threading needle and the guided end are pulled back through the feeding element together. The ends are connected to each other outside the feeding element.

[0020] In one embodiment, the protrusion of the guiding surface is configured as a cone. The cone is arranged offset in the direction opposite to the extending direction.

[0021] In one embodiment, the protrusion of the guiding surface is configured as an asymmetric conical surface. The guiding surface has a relatively steep slope on one side starting from the tip and a relatively flat slope on the opposite side. Starting from the relatively steep slope with a correspondingly smaller radius, the slope continuously changes to a relatively flat slope with a larger radius on the periphery of the guiding surface. The side with the relatively flat slope is oriented along the extending direction. The guiding surface being configured as an asymmetric conical surface has the advantage that the required tip has a smaller height than in a symmetric cone.

[0022] In one embodiment, the protrusion of the guiding surface has a recessedly curved surface section. The recessed shape of the guiding surface has the advantage that the slope of the guiding surface becomes smaller and smaller at its edge and finally extends almost parallel to the surface that transitions into the clamping surface. The guiding of the yarn-passing needle is thus improved in the transition region from the covering element to the extraction end of the storage body.

[0023] In one embodiment, the guiding surface of the covering element has a flattened tip. That is to say, the guiding surface has a highest region, which is formed, for example, by a platform. The platform can be circular or oval.

[0024] In one embodiment, the tip or the highest region itself can be configured asymmetrically.

[0025] In one embodiment, the plate is provided with markings.

[0026] In one embodiment, the covering element is configured as a circular plate, the diameter of which is 20% to 80% of the diameter of the storage body.

[0027] In one embodiment, the height of the protrusion of the guiding surface is 5% to 20% of the diameter of the storage body.

[0028] In one embodiment, the covering element has means for fixing to the storage body. In one embodiment, the fixing means has a retaining ring with a locking element. In one embodiment, the retaining ring has an adapter element that determines the installation direction.

[0029] In one embodiment, the covering element is made of plastic or metal.

[0030] In one embodiment, the covering element is manufactured by injection molding or by deep drawing.

[0031] The yarn feeding device according to the invention is configured to feed yarn to a knitting machine. The knitting machine is a circular knitting machine or a flat knitting machine. As an alternative, the yarn feeding device according to the invention is configured to feed weft yarn to a loom. Description of the Drawings

[0032] The invention is further explained by means of examples schematically shown in the drawings. Among them:

[0033] Figure 1 A schematic view is shown by means of a side view of the yarn feeding device according to the invention, which is shown as a cross-section parallel to the axis of the storage body in the region of the braking device and in which the tip of the yarn-passing needle is drawn along the path of the covering element of the first example and the running direction of the yarn;

[0034] Figure 2 A perspective view of the covering element of the first example is shown;

[0035] Figure 3 A top view of the covering element of the first example and cross-sections A-A, D-D, and C-C are shown;

[0036] Figure 4 A view looking at the covering element from below and cross-section E-E offset by approximately 45° with respect to cross-section A-A are shown;

[0037] Figure 5 A top view of the covering element of the second example and cross-sections A-A, D-D, and C-C respectively corresponding to the cross-sections in Figure 3 are shown. DETAILED DESCRIPTION

[0038] In Figure 1 a yarn feeding device 1 for feeding a yarn 40 to a textile machine is shown, which is configured as a storage-type yarn feeding device.

[0039] The yarn feeding device 1 has a housing 2 and a storage device with a storage body 3, from which the yarn 40 is withdrawn by the textile machine. The textile machine is, for example, a circular knitting machine.

[0040] The housing 2 includes a support 2a and a drive housing 2b. The support 2a is provided with a fixing device 4 for fixing the yarn feeding device 1 to the textile machine, for example, to the machine ring of a circular knitting machine.

[0041] The yarn feeding device 1 has a drivable shaft W, which is visible in Figure 1 in the region of a braking device, and the storage body 3 is arranged on this shaft by means of a bearing L. The shaft W is supported in a rotatable manner relative to the storage body 3. The storage body 3 is fixed to the housing 2. The body axis K of the storage body 3, which substantially corresponds to the axis of the shaft W, is represented by a dashed line in Figure 1 The drive device of the shaft W, which is not visible in the drawing, is arranged in the drive housing 2b.

[0042] The support 2a of the housing 2 extends along the storage body 3 parallel to the shaft E.

[0043] The storage body 3 is configured as a storage drum having a body axis K, which extends parallel to the axis of the shaft W and substantially corresponds to the axis of the shaft W as mentioned. The storage body 3 is at its withdrawal end, that is, in Figure 1The lower end portion thereof is rounded to form a clamping surface 3a. The storage body has an opening 3b at the extraction end. The fixing element S arranged on the shaft W can be accessed through the opening 3b. The opening 3b is provided with a raised edge in this embodiment.

[0044] On the winding end portion of the storage body 3, that is, Figure 1 In the upper part, a winding element 5 with a yarn guiding element 5a is arranged, which is used to wind the yarn 40 onto the storage body 3 of the storage device. At this position, Figure 1 The yarn 40 not shown in the figure is wound onto the storage body 3 in the form of a winding called warping or winding.

[0045] In addition to the storage body 3, the storage device also includes a swing body 6, which is arranged inside the storage body 3.

[0046] The braking device for adjusting the yarn tension of the yarn 40 has a braking body 8 and an adjusting mechanism for the braking body 8. The braking device is arranged behind the storage body 3 during the running of the yarn, and the braking body 8 is arranged at the extraction end of the storage body 3.

[0047] The braking body 8 is conical and more precisely is constructed as a soft braking body cone in the form of a regular frustum shell. The braking body is made of, for example, plastic and / or metal. A corresponding or similar braking body is described, for example, in WO 2006 / 045410A1.

[0048] The axis of the braking body 8 is basically, that is, except for small deviations caused by, for example, lifting caused by the yarn 40 or deformation of the elastic braking body 8, consistent with the body axis K of the storage body 3. The braking body 8 extends above the clamping surface 3a with its larger diameter. The braking body can be pressed against the clamping surface 3a at the extraction end of the storage body 3 by the adjusting mechanism.

[0049] When the yarn 40 is extracted by the textile machine, the yarn 40 runs from the storage body 3 between the extraction end of the storage body 3 and the braking body 8 onto the clamping surface 3a.

[0050] The adjusting mechanism includes an adjusting unit with at least one adjusting element and a feeding unit with at least one feeding element.

[0051] The adjusting unit has a fixing frame of the braking body 8, which has an inner ring 10 and an outer ring 11. The fixing frame is arranged at the smaller diameter of the braking body, that is, at the end where it points away from the storage body 3. The inner ring 10 and the outer ring 11 are connected to each other by a locking connection.

[0052] The delivery unit includes a withdrawal cylinder 12, which is provided with a feed loop hole 13 at its end pointing to the storage body 3 and a delivery loop hole 14 at its opposite end. The delivery unit extends with the feed loop hole 13 reaching into the inner ring 10 of the fixed bracket of the brake body 8. The withdrawal cylinder 12 extends parallel to the axis K except for possible mounting tolerances. During operation, the withdrawal cylinder 12 guides the yarn 40 from its feed end facing the storage body 3 through the feed loop hole 13 towards its opposite delivery end above the delivery loop hole 14, that is, through the adjustment mechanism. The withdrawal cylinder 12 is arranged on the bracket 2a of the housing 2.

[0053] In the illustrated example, the adjustment unit includes a permanent magnet device, which has an upper ring with a permanent magnet P1 and a lower ring 15 with a permanent magnet P2. The upper ring is configured as the outer ring 11 of the fixed bracket of the brake body 8. The lower ring 15 is externally arranged on the withdrawal cylinder 12 by means of a threaded connection and is configured to be axially movable by manual rotation. The ring 15 forms an adjustment element, which is configured to be axially movable with respect to the bracket 2a in order to press the brake body 8 against the clamping surface 3a.

[0054] A covering element of the first example is provided at the withdrawal end of the storage body 3.

[0055] Figure 1 The path N of the tip of the threading needle is shown, and the tip extends at a position relative to the bracket 2a. The extending direction R points away from the bracket 2a in the installed state of the covering element. The extending direction R is Figure 3 shown as an arrow in the top view.

[0056] The covering element is shown in Figure 2 、 3 and 4. Figure 2 A perspective view of the covering element is shown.

[0057] Figure 3 The top view of the covering element of the first example is shown, as well as the cross-section A-A arranged below the top view, the cross-section D-D arranged beside the top view on the left, and the cross-section C-C arranged beside the top view on the right.

[0058] The orientations of the cross-sections A-A, D-D, C-C are drawn in the top view. The cross-section A-A is made through the tip S of the guiding surface and an unshown midpoint, that is, along the extending direction R. The cross-section D-D is made through the midpoint and perpendicular to the extending direction R. The cross-section C-C is made parallel to the cross-section D-D and offset towards the tip S.

[0059] Figure 4Shows a view looking at the covering element from below and a section offset by approximately 45° with respect to section A-A.

[0060] The covering element has a circular plate 20 and a fixing device. The fixing device has a snap ring 21, which in turn has a locking element 21a and a snap ring element 21b. The locking elements 21a alternate with the snap ring elements 21b. The diameter of the snap ring 21 corresponds to the diameter of the opening 3b at the extraction end of the storage body 3. The locking element 21a holds the covering element in the opening 3b.

[0061] The plate 20 is formed as a guiding surface in this example. The guiding surface is configured as an asymmetrically tapered surface and has a recessed curved surface section.

[0062] The protrusion of the guiding surface has a tip, which is arranged asymmetrically in the region of the edge of the projection of the feed opening of the feed loop hole 13 onto the covering element. The tip is on one side of the support 2a, that is, in a position opposite to the extending direction R of the yarn threading needle.

[0063] The section shows a recessed surface section. The surface section starting from the tip S and pointing in the extending direction is recessed.

[0064] The plate 20 of the covering element is provided with a mark M on its upper side on the side opposite to the extending direction R. The mark M facilitates installation.

[0065] The snap ring 21 is provided with an adaptation element. In this example, the snap ring element 2b arranged below the mark M has an outwardly protruding lug N. The opening 3b has a clearance corresponding to the lug N.

[0066] The plate 20 of the covering 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 approximately 60% of the diameter of the storage body 3. The height of the protrusion of the guiding surface is 5% to 20% of the diameter of the storage body 3. In this example, the height is approximately 10% of the diameter of the storage body 3. The covering element is made of plastic by an injection molding method.

[0067] In order to connect the ends of the broken yarn 40, the yarn threading needle is pushed through the delivery loop hole 14, the extraction cylinder 12, and the feed loop hole 13 to the plate 20 of the covering element forming the guiding surface and guided outwards along the extending direction by the guiding surface. This is Figure 2 sketched. The dotted line marks the path of the yarn 40 after connecting the ends.

[0068] In an alternative embodiment, the protrusions of the guide surface of the plate are configured as symmetric cones, which are arranged offset in the direction opposite to the protruding direction. The tip of the cone is asymmetrically arranged in the region of the edge of the projection of the feed opening onto the covering element.

[0069] Figure 5 The top view of the covering element of the second example is shown, as well as the cross-sections A-A, D-D, and C-C corresponding to the Figure 3 cross-section.

[0070] The covering element of the second example is visible in Figure 5 . It corresponds to the covering element of the first example except for the following features: The covering element of the second example also has a circular plate 30 and means for fixing. The means for fixing has a snap ring 31, which has a locking element 31a and a snap ring element 31b. The locking element 31a and the snap ring element 31b alternate.

[0071] The plate 30 is formed into a guide surface. The guide surface is configured as an asymmetrically elliptical conical surface with a flattened tip and has a concavely curved surface section. The protrusion of the guide surface has the highest region formed by an elliptical platform. The platform is symmetrically formed and asymmetrically arranged in the region of the edge of the projection of the feed opening of the feed loop hole 13 onto the covering element. The platform is on one side of the support 2a, that is, in a position opposite to the protruding direction R of the yarn threading needle.

[0072] List of reference numerals:

[0073] 1 Yarn feeding device

[0074] 2 Housing

[0075] 2a Support

[0076] 2b Drive device housing

[0077] 3 Storage body

[0078] 3a Clamping surface

[0079] 3b Opening

[0080] 4 Fixing device

[0081] 5 Winding element

[0082] 5a Yarn guiding element

[0083] 6 Oscillating body

[0084] 8 Braking body

[0085] 10 Inner ring

[0086] 11 Outer ring

[0087] 12 Extraction cylinder

[0088] 13 Feed-in circular hole

[0089] 14 Delivery circular hole

[0090] 15 Ring

[0091] 20 Plate

[0092] 21 Snap ring

[0093] 21a Locking element

[0094] 21b Snap ring element

[0095] 30 Plate

[0096] 31 Snap ring

[0097] 31a Locking element

[0098] 31b Snap ring element

[0099] 40 Yarn

[0100] W axis

[0101] L bearing

[0102] S fixing element

[0103] K body axis

[0104] R extending direction

[0105] N Route of the tip of the yarn threading needle

[0106] P1 Permanent magnet

[0107] P2 Permanent magnet

[0108] S Tip

[0109] P Platform

[0110] M Mark

[0111] N Lug.

Claims

1. A yarn feeding device (1) for feeding a yarn (40) to a textile machine, having: a housing (2) with a bracket (2a); a storage body (3) from which the yarn (40) is withdrawn by the textile machine; a braking device for adjusting the yarn tension of the yarn (40), the braking device being arranged behind the storage body (3) during yarn running, wherein the braking device has a brake body (8) and an adjusting mechanism for the brake body, wherein the brake body (8) can be pressed against a clamping surface (3a) on the withdrawal end of the storage body (3) by the adjusting mechanism, wherein the adjusting mechanism is arranged on the bracket (2a) which extends along the storage body (3), wherein the adjusting mechanism includes at least one adjusting element and at least one feeding element, wherein the adjusting element is configured to be axially movable with respect to the bracket (2a) in order to press the brake body (8) against the clamping surface (3a), and wherein the feeding element is provided with a feeding opening directed towards the brake body, the feeding opening being for guiding the yarn (40) from the brake body (8) in the direction of the textile machine, characterized in that a covering element is provided at the withdrawal end of the storage body (3), wherein the covering element is provided with a guiding surface for guiding a threading needle from the feeding element to the brake body (8), wherein the guiding surface has a protrusion, the tip or its highest region of the protrusion being asymmetrically arranged in the region of the edge of the projection of the feeding opening onto the covering element and being in a position opposite to the extending direction (R) of the threading needle.

2. The wire feeding device according to claim 1, wherein The protrusion of the guiding surface is configured as a symmetric cone.

3. The wire feeding device according to claim 1 or 2, characterized in that, The protrusion of the guiding surface is configured as an asymmetric conical surface.

4. The wire feeding device according to any one of claims 1 or 2, characterized in that, The protrusion of the guiding surface has a recessedly curved surface section.

5. The wire feeding device according to any one of claims 1 or 2, characterized in that The covering element is configured as a circular plate (20, 30), the diameter of the circular plate being 20% to 80% of the diameter of the storage body (3).

6. The wire feeding device according to any one of claims 1 or 2, characterized in that The height of the protrusion of the guiding surface is 5% to 20% of the diameter of the storage body (3).

7. The wire feeding device according to any one of claims 1 or 2, characterized in that The covering element has means for fixing to the storage body (3).

8. The wire feeding device according to claim 7, characterized in that The means for fixing has a snap ring (21, 31) with snap elements (21a, 31a).

9. The wire feeding device according to any one of claims 1 or 2, characterized in that, The covering element is made of plastic or metal.

10. The wire feeding device according to any one of claims 1 or 2, characterized in that The covering element is manufactured by injection molding or by deep drawing.

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