Sliver guide for a drawing frame, and a drawing frame with the silver guide

Abstract

A sliver guide for guiding a plurality of textile slivers in an entry region of a drawing frame, includes a first guide portion for guiding a first group of textile slivers, and a second guide portion for separately guiding a second group of textile slivers. In a side view of the sliver guide, the first guide portion and the second guide portion are spaced apart from one another. The sliver guide has a third guide portion spaced apart from the first guide portion and from the second guide portion. To at least one of the guide portions, lateral guide elements for laterally guiding textile slivers are assigned, wherein the mutual distance of the guide elements can be adjusted.

Claims

1. A sliver guide for guiding a multiple number of fiber slivers in an entrance area of a draw frame, comprising: a first guide section disposed to guide a first group of fiber slivers; a second guide section disposed to separately guide a second group of fiber slivers; in a side view of the sliver guide, the first guide section and the second guide section spaced apart from each other in one or both of a vertical direction or a transport direction of the fiber slivers through the sliver guide; a third guide section spaced apart from the first guide section and the second guide section in the side view in one or both of the vertical direction or the transport direction of the fiber slivers through the sliver guide; first lateral guide elements configured with at least one of the guide sections, wherein a lateral distance between the first lateral guide elements is adjustable.

2. A sliver guide for guiding a multiple number of fiber slivers in an entrance area of a draw frame, comprising: a first guide section disposed to guide a first group of fiber slivers; a second guide section disposed to separately guide a second group of fiber slivers; in a side view of the sliver guide, the first guide section and the second guide section spaced apart from each other; a third guide section spaced apart from the first guide section and the second guide section in the side view; first lateral guide elements configured with at least one of the guide sections, wherein a lateral distance between the first lateral guide elements is adjustable; and further comprising a fourth guide section spaced apart from the first, second, and third guide sections in the side view, and second lateral guide elements configured with the fourth guide section, wherein a lateral distance between the second lateral guide elements is adjustable.

3. The sliver guide in accordance with claim 1, wherein at least two of the guide sections run parallel to each other.

4. A sliver guide for guiding a multiple number of fiber slivers in an entrance area of a draw frame, comprising: a first guide section disposed to guide a first group of fiber slivers; a second guide section disposed to separately guide a second group of fiber slivers; in a side view of the sliver guide, the first guide section and the second guide section spaced apart from each other; a third guide section spaced apart from the first guide section and the second guide section in the side view; first lateral guide elements configured with at least one of the guide sections, wherein a lateral distance between the first lateral guide elements is adjustable; and wherein at least one of the guide sections comprises an elongated rod mounted on one side or both sides thereof.

5. The sliver guide in accordance with claim 4, wherein at least one of the first lateral guide elements is adjustable in position relative to the elongated rod.

6. The sliver guide in accordance with claim 5, further comprising a fixing device that releasably fixes the lateral guide element in position along the elongated rod.

7. The sliver guide in accordance with claim 5, wherein the lateral guide element comprises an eccentric disk with a through hole, the elongated rod passing through the through hole.

8. The sliver guide in accordance with claim 5, the lateral guide element pivotal at a pivot axis relative to the elongated rod.

9. The sliver guide in accordance with claim 2, wherein any one or combination of the first through fourth guide sections further comprises one or more longitudinally spaced intermediate guides that guide laterally spaced fiber slivers moving over the respective guide section.

10. The sliver guide in accordance with claim 9, wherein the intermediate guides are adjustable along a longitudinal axis of the respective guide section.

11. A draw frame, comprising: an entrance area for fiber slivers to be drafted; a drafting unit comprising a plurality of drafting unit rollers; a sliver guide section at the entrance area, the sliver guide section further comprising a first guide section disposed to guide a first group of fiber slivers; a second guide section disposed to separately guide a second group of fiber slivers; in a side view of the sliver guide, the first guide section and the second guide section spaced apart from each other in one or both of a vertical direction or a transport direction of the fiber slivers through the sliver guide; a third guide section spaced apart from the first guide section and the second guide section in the side view in one or both of the vertical direction or the transport direction of the fiber slivers through the sliver guide; first lateral guide elements configured with at least one of the guide sections, wherein a lateral distance between the first lateral guide elements is adjustable.

12. A draw frame, comprising: an entrance area for fiber slivers to be drafted; a drafting unit comprising a plurality of drafting unit rollers; a sliver guide section at the entrance area, the sliver guide section further comprising a first guide section disposed to guide a first group of fiber slivers; a second guide section disposed to separately guide a second group of fiber slivers; in a side view of the sliver guide, the first guide section and the second guide section spaced apart from each other; a third guide section spaced apart from the first guide section and the second guide section in the side view; first lateral guide elements configured with at least one of the guide sections, wherein a lateral distance between the first lateral guide elements is adjustable; and wherein the sliver guide further comprises a fourth guide section spaced apart from the first, second, and third guide sections in the side view, and second lateral guide elements configured with the fourth guide section, wherein a lateral distance between the second lateral guide elements is adjustable.

13. The draw frame in accordance with claim 12, wherein the first through fourth guide sections are aligned horizontally or perpendicular to a transport direction of the fiber slivers through the drafting unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages of the invention are described in the following embodiments. The following is shown:

(2) FIG. 1 is a side view of a draw frame;

(3) FIG. 2 is a perspective of a sliver guide in accordance with the invention;

(4) FIG. 3 is a top view of a sliver guide in accordance with the invention;

(5) FIG. 4 is a side view of a section of a sliver guide in accordance with the invention in the entrance area of a drafting unit;

(6) FIG. 5 is a side view of a section of an alternative sliver guide in accordance with the invention;

(7) FIG. 6 is a guide element for a sliver guide in accordance with the invention; and

(8) FIG. 7 is a top view of an additional sliver guide in accordance with the invention.

DETAILED DESCRIPTION

(9) Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

(10) FIG. 1 shows a side view of a draw frame 4 for drafting (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 via corresponding deflection devices 20 and a sliver guide 1 to the drafting unit 18 of the draw frame 4 (or in the case of a multi-head draw frame: the drafting units 18 of the draw frame 4).

(11) The drafting unit or each of the drafting 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 drafting of the fiber assembly consisting of 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 drafting unit 18. While other solutions are also possible, in the embodiments shown, the drafting 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 assembly may be guided by clamping. Given the peripheral speeds of the specified cylinder increasing in the transport direction, the drafting and thus the fiber assembly is finally made uniform.

(12) Following the drafting unit 18, the drafted fiber material (=fiber web 19) is typically conducted through a condenser (not shown), which is preferably formed as a web funnel and brings about a condensing of the fiber web 19.

(13) Subsequently, the fiber web 19 arrives in the area of a draw-off device 23, which typically comprises a multiple number of rotatable or at least partially driven draw-off elements, for example in the form of two draw-off disks 22 contacting the fiber web 19 from two sides. Through a correspondingly high conveying speed, the draw-off device 23 brings about a further draft of the fiber web 19. Finally, the fiber web 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.

(14) 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 drafting unit 18. For this purpose, the known sliver guides 1 usually have a multiple number of rods running in parallel to each other and vertically, between which the individual fiber slivers 2 are guided.

(15) 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 web 19, this lack of quality usually can still be seen in the fact that the homogeneity of the same deviates from a desired target value.

(16) 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).

(17) 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 drafting unit 18, whereas the drafting 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 drafting unit 18, or between the two entry rollers (shown on the left in FIG. 1).

(18) 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 section 8, are divided into two groups (alternatively, the fourth guide section 8 can be dispensed with, whereas, in this case, after passing the deflection devices 20 shown in FIG. 1, the fiber slivers 2 would be split into the first and second guide sections 5, 6).

(19) 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.

(20) 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 herein 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 drafting unit 18 following in the transport direction T). Herein, a mixing of the individual fiber slivers 2 arises in front of the entrance into the drafting unit 18, such that differences in quality may have less strong effects on the fiber web 19 leaving the drafting unit 18.

(21) 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 is passed by the first group of the fiber slivers 2 at the top and by the second group of fiber slivers 2 at the bottom.

(22) 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.

(23) 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 drafted, 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 at least partially overlay each other in the area of the third guide section 7.

(24) 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.

(25) 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.

(26) 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.

(27) 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 differently; 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).

(28) This invention is not limited to the illustrated and described embodiments. Variations within the framework of the claims are also possible, 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 connectable 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

(29) 1 Sliver guide 2 Fiber sliver 3 Entrance area 4 Draw frame 5 First guide section 6 Second guide section 7 Third guide section 8 Fourth guide section 9 Guide element 10 Guide rod 11 Fixing device 12 Through hole 13 Eccentric disk 14 Pivot axis 15 Intermediate guide 16 Rotary plate 17 Bottom roller 18 Drafting unit 19 Fiber web 20 Deflection device 21 Spinning can 22 Draw-off disk 23 Draw-off device 24 Mount 25 Top roller 26 Side wall A Distance T Transport direction of the drafting unit