YARN FEED MODULE

Abstract

The invention concerns a yarn feed module for supplying yarn into a textile machine, including a drive roller for supplying the yarn, a guide element for guiding the yarn, and a restrain element that is arranged between the drive roller and the guide element in order to ensure that, on supplying of the yarn, the yarn detaches from the drive roller. The invention also concerns a textile machine including such a yarn feed module.

Claims

1. Yarn feed module, comprising: a drive roller is arranged so as to be free; a guide element which is arranged behind the drive roller viewed in the supply direction in order, during supplying of the yarn, to guide the yarn by contact therewith so that the supply direction is adjusted by the guide element, wherein the yarn feed module has a restrain element which, viewed in the supply direction, is arranged between the drive roller and the guide element in order, on supplying of the yarn, to ensure that the yarn detaches the drive roller.

2. Yarn feed module according to claim 1, wherein the drive roller is arranged so as to be rotatable around a rotation axis; that, viewed in a projection plane perpendicular to the rotation axis, during supplying of the yarn, the yarn is supplied between the drive roller and the guide element approximately along a common tangent of the drive roller and guide element; that the restrain element comprises a restrain surface; and that viewed in the projection plane, said restrain surface is arranged on the same side of the tangent as the drive roller.

3. Yarn feed module according to claim 2, wherein the drive roller is mainly cylindrical with a radius r, and that the restrain element is arranged at an intermediate distance t from the tangent, wherein t≤the radius r of the drive roller.

4. Yarn feed module according to claim 2, wherein the point of the restrain element which is closest to the tangent is arranged at a distance x from the contact point of said tangent with the drive roller, wherein this distance x≤half the distance y from the contact point of the tangent with the drive roller to the contact point of the guide element with the tangent.

5. Yarn feed module according to claim 2, wherein the restrain surface is arranged mainly parallel to the rotation axis.

6. Yarn feed module according to claim 1, wherein the restrain element is designed so as to be convex on its side pointing towards the tangent.

7. Yarn feed module according to claim 5, wherein the restrain element is configured as a pin.

8. Yarn feed module according to claim 5, wherein, viewed in cross-section in a section perpendicular to the rotation axis, the restrain element is wedge-shaped so as to drive a wedge between the drive roller and the yarn.

9. Yarn feed module according to claim 1, wherein the restrain element is arranged fixedly.

10. Yarn feed module according to claim 1, wherein the yarn feed module comprises a carrier element which is displaceable relative to the drive roller, and comprises a drive-back element for exerting a force on the carrier element in order to drive said carrier element towards the drive roller, and comprises a guide roller which is arranged on the carrier element so as to be freely rotatable around a rotation axis in order, when the carrier element is driven towards the drive roller by the drive-back element, to clamp the supplied yarn between the drive roller and the guide roller, wherein the restrain element is arranged on the carrier element.

11. Yarn feed module according to claim 1, wherein the restrain element is configured such that, on supplying of the yarn, if the yarn tension remains above a supply yarn tension, the restrain element allows unhindered supplying of the yarn.

12. Textile machine, claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Embodiments of the disclosure will now be explained in more detail with reference to the following description. The aim of this description is exclusively to provide explanatory examples and indicate further advantages and features, and may not therefore be interpreted as restricting the area of application of the disclosure or the patent rights claimed in the claims.

[0053] In the description, by means of reference signs, reference is made to the attached drawings in which:

[0054] FIG. 1 shows a front view of a feed device with various yarn feed modules, including a first embodiment of a yarn feed module according to this disclosure;

[0055] FIG. 2 shows particularly and in more detail a part of the feed device from FIG. 1 at the position of the first embodiment;

[0056] FIG. 3 shows particularly and in perspective a part of the feed device in FIG. 1 at the position of the first embodiment;

[0057] FIG. 4 shows a front view of a part of a feed device at the position of a second embodiment of a yarn feed module according to this disclosure;

[0058] FIG. 5 shows a front view of a part of a feed device at the position of a third embodiment of a yarn feed module according to this disclosure;

[0059] FIG. 6 shows separately and in perspective a part of the feed device from FIG. 5 at the position of the third embodiment;

[0060] FIG. 7 shows a front view of a part of a feed device at the position of a fourth embodiment of a yarn feed module according to this disclosure;

[0061] FIG. 8 shows separately and in perspective a part of the feed device from FIG. 7 at the position of the fourth embodiment.

DETAILED DESCRIPTION

[0062] The yarn feed modules (1) shown each comprise, per supplied yarn (2), a drive roller (3) which is arranged so as to be rotatable around a rotation axis (R) and a motor (10) for driving said drive roller (3). By means of the drive roller (3), yarn (2) may be picked up from a yarn storage system (not shown) and supplied according to a supply direction (A) to a yarn pick-up system (not shown). Between the drive roller (3) and the yarn pick-up system, a guide element (5) is arranged, by means of which the yarn path 20 followed by the supplied yarn (2) is adjusted in order to ensure that the yarn (2) is kept away from further elements of the yarn feed module (1) or adjacent components, such as e.g. a drive roller (3) from an adjacent yarn feed module (1).

[0063] In the embodiment shown, viewed in the supply direction (A), a restrain element (6) is arranged between the drive roller (3) and the guide element (5) in order to ensure, on supplying of the yarn (2), that the yarn (2) detaches from the drive roller (3).

[0064] In the embodiment shown, furthermore a carrier element (7) is arranged so as to be rotatable around the rotation axis (T). A guide roller (4) is arranged on this carrier element (7). Springs (8) drive the carrier element (7) towards the drive roller (3) such that the guide roller (4) is clamped against the drive roller (3) in order to clamp the yarn (2) between the drive roller (3) and the guide roller (4). The yarn (2) which is supplied from the yarn storage system is first wound around part of the guide roller (4), arranged between the guide roller (4) and the drive roller (3), and wound around part of the drive roller (3). The yarn (2) is not arranged fully around these rollers (3, 4) but runs only over an arcuate part of their mantle surfaces. Instead of such a carrier element (7) with such a guide roller (4), other means are known for restricting a slippage of the yarn (2) relative to the drive roller (3).

[0065] At the top of the feed device (9) shown in FIG. 1, six known yarn feed modules (1′) according to the prior art are arranged, together with two yarn feed modules (1) according to a first embodiment of the disclosure, which are also shown in more detail in FIGS. 2 and 3. In these yarn feed modules (1) according to the disclosure, the restrain element (6) is configured as a pin which is provided on the carrier element (7). This mainly cylindrical pin is arranged parallel to the mainly cylindrical drive roller (3), so that this is displaceable together with said carrier element (7) relative to the drive roller (3).

[0066] In the second embodiment in FIG. 4, the mainly cylindrical pin from the first embodiment is replaced by a pin with a wedge-shaped cross section. In the third embodiment in FIG. 5, the restrain element (6) is again a mainly cylindrical pin which is now provided separately from the carrier element (7) and is arranged fixedly in the yarn feed module (1).

[0067] FIG. 6 shows a yarn feed module (1) according to the first embodiment (left) and a yarn feed module (1) according to the third embodiment (right). In the fourth embodiment in FIG. 7, the mainly cylindrical pin from the third embodiment has been replaced by a pin with a wedge-shaped cross section. FIG. 7 shows a yarn feed module (1) according to the first embodiment (left) and a yarn feed module (1) according to the fourth embodiment (right).

[0068] In the embodiments shown, the pins (6) each have a height which corresponds at least to the height of the mantle surface of the drive roller (3).

[0069] In all embodiments shown, viewed in a projection plane perpendicular to the rotation axis (R) of the drive roller (3), on supplying of the yarn (2), said yarn is supplied along a common tangent (X) of the drive roller (3) and the guide element (5), as shown in FIGS. 2, 4, 5 and 7. Viewed in this projection plane, the restrain element (6) is also arranged on the same side of the tangent (X) as the drive roller (3).

[0070] In the first, second and third embodiments, said restrain element (6) is arranged at a positive intermediate distance t from the tangent (X) (t >0) which is less than the radius r of the drive roller (3) (t<r). In the fourth embodiment, said restrain element (6) touches this tangent (X) without intermediate distance (t=0).

[0071] In each case, the point of the restrain element (6) which is arranged closest to the tangent (X) is arranged at a distance x from the contact point of the tangent (X) with the drive roller (3), wherein this distance x is much smaller than the distance y from the contact point of the tangent (X) with the drive roller (3) to the contact point of the guide element (5) with the tangent (X). In the first, second and third embodiments, x is around one quarter of y. In the fourth embodiment, x is approximately one twelfth of y.