Sliver Guide for a Drawing Frame, and Drawing Frame

Abstract

The invention relates to a sliver guide for guiding a multiple number of fiber slivers (2) in an entrance area (3) of a draw frame (4), with a first guide section (5) for guiding a first group of fiber slivers (2), with a second guide section (6) for the separate guidance of a second group of fiber slivers (2), whereas, in a side view of the sliver guide (1), the first guide section (5) and the second guide section (6) are spaced apart from each other. In accordance with the invention, it is proposed that the sliver guide (1) features a third guide section (7) which, in the specified side view, is spaced apart from the first guide section (5) and the second guide section (6), whereas lateral guide elements (9) are allocated to at least one of the guide sections (5; 6; 7) for the lateral guidance of fiber slivers (2), whereas the mutual distance (A) of the lateral guide elements (9) is adjustable.

Claims

1. Sliver guide for guiding a multiple number of fiber ribbons (2) in an entrance area (3) of a draw frame (4), with a first guide section (5) for guiding a first group of fiber ribbons (2), with a second guide section (6) for the separate guidance of a second group of fiber ribbons (2), whereas, in a side view of the ribbon guide (1), the first guide section (5) and the second guide section (6) are spaced apart from each other, characterized in that the ribbon guide (1) features a third guide section (7) which, in the specified side view, is spaced apart from the first guide section (5) and the second guide section (6), whereas lateral guide elements (9) are allocated to at least one of the guide sections (5; 6; 7) for the lateral guidance of fiber slivers (2), whereas the mutual distance (A) of the lateral guide elements (9) is adjustable.

2-14. (canceled)

Description

[0023] Further advantages of the invention are described in the following embodiments. The following is shown:

[0024] FIG. 1 a side view of a draw frame,

[0025] FIG. 2 a perspective of a sliver guide in accordance with the invention,

[0026] FIG. 3 a top view of a sliver guide in accordance with the invention,

[0027] FIG. 4 a side view of a section of a sliver guide in accordance with the invention in the entrance area of a stretching unit,

[0028] FIG. 5 a side view of a section of an alternative sliver guide in accordance with the invention,

[0029] FIG. 6 a guide element for a sliver guide in accordance with the invention, and

[0030] FIG. 7 a top view of an additional sliver guide in accordance with the invention.

[0031] FIG. 1 shows a side view of a draw frame 4 for stretching (making uniform) several fiber slivers 2. During the operation of the draw frame 4, the fiber slivers 2 are taken from one or more so-called spinning cans 21, and are fed through corresponding reversing chambers 20 and a sliver guide 1 to the stretching unit 18 of the draw frame 4 (or in the case of a multi-head draw frame: the stretching unit 18 of the draw frame 4).

[0032] The stretching unit or each of the stretching units 18 typically includes three or more roller assemblies, each of which may feature at least one bottom roller 17 and one or more top rollers 25. The desired drawing of the fiber sliver from the individual fiber slivers 2 finally arises from the fact that the individual cylindrical bottom rollers 17, and thus also the individual top rollers 25 in contact with them have a progressively greater peripheral speed in the shown transport direction T of the stretching unit 18. While other solutions are also possible, in the embodiments shown, the stretching unit 18 has bottom rollers 17 in the form of an entry cylinder, a medium cylinder and an output cylinder (viewed in the transport direction, arranged one after the other). The individual cylinders are in turn in contact with one or more opposing cylinders formed by the top rollers 25, such that the fiber composite may be guided by clamping. Given the peripheral speeds of the specified cylinder increasing in the transport direction, the stretching and thus the fiber sliver is finally made uniform.

[0033] Following the stretching unit 18, the stretched fiber material (=fiber fleece 19) is typically conducted by a compressor (not shown), which is preferably formed as a fleece funnel and brings about a compaction of the fiber fleece 19.

[0034] Subsequently, the fiber fleece 19 arrives in the area of a draw-off device 23, which typically comprises a multiple number of rotatable or at least partially driv-en draw-off elements, for example in the form of two draw-off disks 22 contacting the fiber fleece 19 from two sides. Through a correspondingly high conveying speed, the draw-off device 23 brings about a further drawing of the fiber fleece 19. Finally, the fiber fleece 19 is typically fed to a rotating rotary plate 16 and is stored by this in the form of a loop in a provided spinning can 21.

[0035] As already mentioned, the individual fiber slivers 2 are typically guided by means of a sliver guide 1 arranged in the entrance area 3 of the stretching unit 18. For this purpose, the known sliver guide 1 usually has a multiple number of rods running in parallel to each other and vertically, between which the individual fiber slivers 2 are guided.

[0036] However, if one of the fiber slivers 2 has a certain property (thickness, composition, fiber length, etc.) that is different from the corresponding property of the other fiber slivers 2, in the drawn fiber fleece 19, this lack of quality usually can still be seen in the fact that the homogeneity of the same deviates from a desired tar-get value.

[0037] In order to counter this disadvantage, the present invention proposes a new sliver guide 1, as is shown for example in FIGS. 2, 3 and 7 (details of the same shown in FIGS. 4 to 6).

[0038] In principle, the sliver guide 1 in accordance with the invention comprises at least three, preferably four (as is shown), guide sections 5, 6, 7, 8, which, in different manners, serve the purpose of guiding individual or all fiber slivers 2 fed to the stretching unit 18, whereas the stretching unit 18, with reference to FIG. 2, would be located at the bottom left, and the sliver guide 1 may be connected, for example, through the shown mounts 24 to a corresponding connection of the draw frame 4 in such a manner that the fiber slivers 2, after leaving the sliver guide 1, may directly enter the stretching unit 18, or between the two entry rollers (shown on the left in FIG. 1).

[0039] As can now be seen in FIGS. 3 (top view) and 4 (principle course of the individual fiber slivers 2 in a side view of the sliver guide 1 shown only schematically), the fiber slivers 2, which, viewed in the transport direction, are preferably initially guided with the use of the fourth guide sections 8, are divided into two groups (alternatively, the fourth guide section 8 can be dispensed with, whereas, in this case, after passing through the reversing chambers 20 shown in FIG. 1, the fiber slivers 2 would be split into the first and second guide sections 5, 6).

[0040] As can be seen in this connection from FIG. 4, the first group of fiber slivers 2 may rest on the first guide section 5 through its underside, while the fiber slivers 2 of a second group may abut from below at the second guide section 6 and are thus also guided at least in the vertical direction.

[0041] After passing through the first and the second guide sections 5, 6, the fiber slivers 2 ultimately arrive in the area of a third guide section 7 (for this purpose, see also FIG. 3), whereas the individual fiber slivers 2 thereby are at least partially overlaid (this is indicated in FIG. 4 by the distance of the fiber slivers 2 between the third guide section 7 and the entry rollers assembly of the stretching unit 18 following in the transport direction T). Thereby, a mixing of the individual fiber slivers 2 arises in front of the entrance into the stretching unit 18, such that differ-ences in quality may have less strong effects on the fiber fleece 19 leaving the stretching unit 18.

[0042] Of course, the course of the fiber slivers 2 that is shown is only meant to be used as an example. It would also be conceivable, for example, to guide the fibers in accordance with FIG. 5, whereas, in such a case, the third guide section 7 passes from the first group of the fiber slivers 2 at the top and from the second group of fiber slivers 2 at the bottom.

[0043] At this point, it is also to be noted, in general for the entire disclosure, that the invention is not limited to distributing the fiber slivers 2 to two guide sections. Rather, it would also be possible to provide additional guide sections, in addition to the specified first and second guide sections 5, 6, such that the fiber slivers 2 could be divided, for example, among three or four groups, before they are once again united in the area of the guide section 7 designated as the third guide section within the framework of the previous description, and are thereby overlaid.

[0044] In general, however, it is essential to the invention that two lateral guide elements 9 for the fiber slivers 2 to be guided are allocated to at least one of the guide sections 5, 6, 7, 8, whereas the distance A of the guide elements 9 is adjustable (preferably through the movement of one or both guide elements 9). As can be seen in this connection, for example from FIG. 3, the guide elements 9 serve the purpose of the lateral guidance of the fiber slivers 2 and thus the setting of the width of the guide area to be passed through by the fiber slivers 2. Depending on the type, number and thickness of the fiber slivers 2 to be stretched, the specified width may finally be adjusted by moving one or both guide elements 9, such that it is always ensured that the fiber slivers 2 are at least partially overlaid in the area of the third guide section 7.

[0045] As can be inferred, for example, from FIG. 2 (with which the guide elements 9 are not shown for reasons of clarity), the individual guide sections 5, 6, 7, 8 are preferably realized by separate guide elements 9, in particular in the form of, for example, guide rods 10 fixed on both sides with respect to the corresponding side walls. In cross-section, the guide rods 10 may be, for example, round, oval or in teardrop shape, and, with the assistance of fixing devices 11 (such as screws), may be detachably connected to the side walls 26 of the sliver guide 1.

[0046] Further, it is conceivable that intermediate guides 15 are present in the area of the individual guide sections 5, 6, 7, 8, preferably in the area of the first and the second guide sections 5, 6. These may be formed, for example, by ring disks, which are mounted (for example, detachably) on the specified guide rods 10, and, with their assistance, the individual fiber slivers 2 may be guided in a manner separated from each other (compare FIG. 7). The intermediate guides 15 of the individual guide sections 5, 6, 7, 8 can also be offset from each other in the width direction of the sliver guide 1 (i.e., perpendicular to the transport direction T), resulting in a highly reliable superimposition of the individual fiber slivers 2 in the area of the third guide section 7.

[0047] As FIGS. 3 and 7 also show, the guide elements 9 may be attached directly to a guide rod 10 featuring a guide section 5, 6, 7, 8, and it is conceivable, for example, to form the respective guide element 9 in a paddle shape and to realize the attachment to the guide bar 10 with the assistance of a pivot axis 14, such that, by pivoting the guide element(s) 9, their mutual distance A may also be adjusted.

[0048] Alternatively, the guide elements 9 may also be formed by eccentric disks 13 shown in FIGS. 5 to 7, which are preferably inserted through a through hole 12 to the respective guide rod 10 and, for example, may be fixed with a fixing device 11 (screw, threaded bolt, or the like) to the intended position. By rotating the eccentric disks 13, the lateral guidance of the fiber slivers 2 may ultimately be adjusted if necessary (see FIG. 5, in which the eccentric disks 13 are aligned dif-ferently; incidentally, in FIG. 5, only guide elements 9 arranged behind the sheet level are shown, in order to enable a view of the fiber slivers 2).

[0049] This invention is not limited to the illustrated and described embodiments. Varia-tions within the framework of the claims, such as any combination of the described characteristics, even if they are illustrated and described in different parts of the description or the claims or in different embodiments. For example, the individual guide sections need not all be part of a sliver guide detachably connect-able with the draw frame. Rather, the individual guide sections may be attached independently of each other to a support or a frame of the draw frame.

REFERENCE SIGNS

[0050] 1 Sliver guide [0051] 2 Fiber sliver [0052] 3 Entrance area [0053] 4 Draw frame [0054] 5 First guide section [0055] 6 Second guide section [0056] 7 Third guide section [0057] 8 Fourth guide section [0058] 9 Guide element [0059] 10 Guide rod [0060] 11 Fixing device [0061] 12 Through hole [0062] 13 Eccentric disk [0063] 14 Pivot axis [0064] 15 Intermediate guide [0065] 16 Rotary plate [0066] 17 Bottom roller [0067] 18 Stretching unit [0068] 19 Fiber fleece [0069] 20 Reversing chamber [0070] 21 Spinning can [0071] 22 Draw-off disk [0072] 23 Draw-off device [0073] 24 Mount [0074] 25 Top roller [0075] 26 Side wall [0076] A Distance [0077] T Transport direction of the stretching unit