JPH11279855A - Spinning machine equipped with draft machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sliver guide in the drafting process so that the satisfactory quality of the yarn is attained in any cases. SOLUTION: In a spinning machine, the drafting machine is equipped with at least one pair of the first rollers w1 and at least one pair of the second rollers w2 and the lower-side apron 14 or the upper side apron 12 are arranged between them and both aprons are partially guided by the turning bridge 18 or cage 16 between the roller couples w1, w2. The sliver 10 are bent roughly in an S-shape on its pass way from roller couple w1, via between the aprons 12, 14 or the cage 16 at the bending bridge 18 to the second roller couple w2. Further, in the first range of the S-shape, the curvature of the sliver is made smaller than radius of curvatures r2, r3, until it comes at least to the turning point, resultantly it gradually increases on the side opposing to the bending bridge sliver 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning machine having a draft device, wherein the draft device comprises at least one first roller pair and a second roller pair. Each roller is wound by a lower apron or an upper apron, both aprons being closed and being in close contact with each other over a predetermined section through the lower diverting bridge or the upper cage.
Of the sliver introduced between the pair of rollers or the apron.

[0002]

2. Description of the Related Art Patent documents describe a drafting device for a spinning machine in which a sliver is bent a plurality of times between two roller pairs each time. In this case, the sliver is partially
The apron follows the course of the aprons being pressed together between the deflection members for the apron arranged between the roller pairs. The intention of the multiple deflections is to push the slivers such that the fibers do not disperse excessively during the drafting process and are guided in a controlled manner with respect to the speed increase. Corresponding publications are known from EP 0 450 361 and German Patent Application No. 43 43 199.2.

It has been found that conventional solutions do not achieve satisfactory yarn quality in all cases.

[0004]

It is an object of the present invention to further improve sliver guidance during the drafting process.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to an embodiment of the present invention, at least three curves having at least three kinds of radii of curvature are provided on a side of the deflection bridge facing the lower apron and the cage. At the same time, these curvature ranges being continuous in the direction of travel of the sliver, relative to the mutual spacing of the roller pairs, preferably the following value range: r1 = (0.3. ... 0.7) s r2 = (0.7... 1.2) s r3 = (0.25... 0.5) s I did it.

[0006]

According to the spinning machine having the draft device according to the present invention, it is possible to produce a yarn having higher quality than a yarn produced by a conventional draft member.

An object of the present invention is a spinning machine having a draft device comprising at least one first roller pair and a second roller pair, wherein each roller of the first roller pair has a lower apron or a lower apron. Wound by the upper apron, both aprons are closed and are guided towards the second pair of rollers in close contact with each other over a predetermined section through the lower diverting bridge or the upper cage. . In this case, an attempt is made to produce a curved profile of the sliver introduced between the roller pair or the apron. In this case, the lower apron and the side facing the cage of the deflecting bridge have approximately three curvatures with different radii of curvature, these curvatures being continuous in the direction of travel of the sliver. , Initially transitioning from a moderate curvature to a weak curvature and from this weak curvature to a stronger curvature. The radius of curvature of the diverting bridge is initially approximately half the distance between the roller pairs, relative to the distance between the roller pairs, and takes a value corresponding to the distance between the roller pairs in the central range, The end range closest to the roller pair is at most half the distance between the roller pairs. The length of the deflecting bridge in the range defining the profile of the sliver is approximately half the distance between the two roller pairs. The first radius of curvature of the diverting bridge, which has a radius of curvature corresponding to approximately half the distance between the roller pairs, extends in the direction of travel of the sliver over the length of up to half of the diverting bridge, while following it Both curved regions having a reduced radius of curvature are located in the central region or the terminal region of the diverting bridge. The diameter of each roller should be between 50 and 50
Reaches 70%. The end of the cage is located as close as possible to the second pair of rollers, the end being located between the end of the diverting bridge having a third range of curvature and the second pair of rollers. The result is preferably an S-shaped profile of the sliver between the two roller pairs. The diverting bridge and the cage are formed such that a gradually closing gap is created between the lower apron and the upper apron in the first bending range of the diverting bridge, and the sliver entering in this gap is tightened. . In the subsequent bending range, the pressure per unit area applied to the sliver gradually increases. This is best achieved by a gradual increase in the curvature of the deflection bridge in the second and third bending ranges. During drafting of the sliver, the sliver is always guided on a curved trajectory at least in the region of the diverting bridge, the curvature of this curvature being the part of the diverting bridge located in the vicinity of the second pair of rollers. To increase in range. The curvature range initially has a relatively strong curvature to enter the gap between the upper and lower aprons in the direction of travel of the sliver. The second area of the diverting bridge continues to have a relatively low curvature and relatively little sliver compression. Such a second
In the range, the fibers are tightened less than in the last area with a relatively strong curvature following this second area, with a smaller radius of curvature than the first or entry area of the diverting bridge. So it can be drafted rather.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The sliver 10 is further moved by the roller pair w through the break draft area to the first roller pair w1 and then to the second roller pair w1.
Sliver 10 is supplied to a kneading / winding device. Between the roller pair w1 and w2, there is a diverting bridge 18 and a cage 16 abutting on the diverting bridge 18, and the end of the cage 16 facing the roller pair w2 is formed between the diverting bridge 18 and the roller pair w2. The range is in between. Each roller of the first roller pair w1 is wound by a lower apron 14 or an upper apron 12, both aprons being guided only by a deflection bridge 18 or a cage 16 which is only partially shown. The apron is closed and circulated by the roller pair w1, thereby transporting the sliver 10 from the roller pair w1 to the roller pair w2. As can be seen in the diagram, the sliver 10 then proceeds in an S-shaped path. In this case, the first arc of S is created by the contour of the deflection bridge 18 facing the cage, and the second arc of S is created by the aforementioned end contour of the cage 16. Cage 1 with deflection bridge 18, lower apron 14 and upper apron 12 facing this deflection bridge
6, and roller pair w1 and w2 are apron 1
4, 12 and sliver 10 or roller pair w1 and w
The two rollers are shown to have sufficient spacing from each other. In the actual drafting device of the spinning machine, the rollers w1,
The distance between w2 and the aprons 14, 12 is
Are sized so that the fibers of the sliver 10 can be properly drafted.

In accordance with the present invention, the diverting bridge 18 has at least three different ranges of curvature simultaneously having radii of curvature r1, r2, and r3. The roller pairs w1 and w2 are arranged at an interval s from each other. The dimension s and the length u of the deflecting bridge 18 acting on the sliver 10 are approximately 2: 1 with each other, measured in the direction of the connection line of the clamping gap of the roller pairs w1 and w2. Radius of curvature r
1, r2, r3 are such that the first radius r1 is approximately half of the roller spacing s, the radius r2 is approximately equal to the roller spacing, and the radius of curvature r3 is only about one third of the roller spacing s. Selected. In a preferred embodiment, the diameter D of the roller pair w1, w2 is one half of the roller spacing s.
A little bigger.

From the following table, the preferred dimensions of the above-mentioned components of the drafting device are clear.

[0012]

[Table 1]

The above dimensions are given in mm in the example of a ring spinning machine. Regardless of the effective dimensions, the dimensions of the members of the drafting device can be indicated relative to each other as follows.

[0014]

[Table 2]

The effective size can be calculated by substituting an arbitrary value for the roller interval s.

[Brief description of the drawings]

FIG. 1 is a schematic view of a draft device of a spinning machine according to the present invention.

[Description of Signs] 10 sliver, 12 upper apron, 14 lower apron, 16 cage, 18 turning bridge,
r1 radius of curvature, r2 radius of curvature, r3 radius of curvature,
w roller pair, w1 first roller pair, w2 second roller pair, s roller spacing, u length of deflecting bridge with curvature range

Continued on the front page (72) Inventor Felix Bratmann Wiesendengen Stazionstrasse 74

Claims (8)

[Claims] 1. A spinning machine having a draft device,
The drafting device includes at least one first roller pair (w1) and a second roller pair (w2), and each roller of the first roller pair (w1) has a lower apron (1).
4) or wound around by an upper apron (12), both aprons being closed and in close contact with each other over a predetermined section through the lower diverting bridge (18) or the upper cage (16). The sliver (1) introduced between the roller pair (w1, w2) or the apron (12, 14) towards the second roller pair (w2)
0) wherein the curved profile is guided so as to produce a curved profile, wherein the side facing the lower apron (14) and the cage (16) of the deflection bridge (18) has at least three different radii of curvature ( r1, r2, r3) at the same time, these curvature ranges being continuous in the direction of travel of the sliver (10) and the spacing of the roller pairs (w1, w2) to each other. Relative to (s),
Preferably the following value range: r1 = (0.3 ... 0.7) s r2 = (0.7 ... 1.2) s r3 = (0.25 .... 0.5) A spinning machine having a draft device, characterized by having a radius of curvature at s. 2. Three types of bending ranges (r1, r2, r3)
The length (u) of the diverting bridge (18) having
The following value range u = (0.5... 0.7) s is provided relative to the roller interval (s) in the direction of the coupling line of the tightening gap of the roller pair (w1, w2). The spinning machine according to claim 1, wherein 3. A first radius of curvature having a radius of curvature (r1) extends over approximately half the length (u / 2) of the diverting bridge in the direction of travel of the sliver (10), followed by it. 3. The spinning machine according to claim 2, wherein the two curved regions having the radii of curvature (r2, r3) are located in a central region on the relevant side of the deflection bridge (18) or in a terminal region on the relevant side. 4. The value range of the diameter (D) of the roller pair (w1, w2) relative to the roller interval (s) is as follows: D = (0.5... 0.7) s The spinning machine according to any one of claims 1 to 3, comprising: 5. The end of the cage (16) is located between the end of the diverting bridge (18) whose end has a third radius of curvature (r3) and the second pair of rollers (w2). Claimed in that the sliver has an S-shaped profile between the pair of rollers (w1, w2), as it is located near the second pair of rollers (w2). Item 5. The spinning machine according to any one of Items 1 to 4. 6. A deflection bridge (18) and a cage (16).
Is the first bending range (r1) of the diverting bridge (18).
Lower apron (14) and upper apron (12) in
Between the apron (14, 12) and a sliver (1) entering the gap.
0) is arranged so as to be tightened, and in another bending range (r2, r3) thereafter, the sliver (1) is further tightened.
The spinning machine according to any one of claims 1 to 5, wherein the pressure per unit area according to (0) increases. 7. A cage having a deflecting bridge (18) having a lower apron (14) and an upper apron (12) between a first roller pair (w1) and a second roller pair (w2). (16) is a sliver (10) running between a pair of rollers (w1, w2) or an apron (12, 14).
Are arranged so as to be guided in an S-shape towards the clamping gap of the roller pair (w2), the curvature preferably increasing progressively on the S-shaped path to at least the S turning point. The spinning machine according to any one of claims 1 to 6, wherein: 8. A spinning machine having a draft device, comprising:
A diverting bridge (1) having a lower apron (14) between a first roller pair (w1) and a second roller pair (w2).
8) and a cage (16) having an upper apron (12), the roller pair (w
1, w2) or apron (12, 14) is guided on a constantly curved track at least in the area of the deflection bridge (18) towards the clamping gap of the roller pair (w2). Wherein the curvature of the curvature increases in at least one sub-region of the diverting bridge (18) located near the second pair of rollers (w2). A spinning machine having a draft device.