JP2003313735A - Apparatus for condensing fiber strand in spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for condensing fiber strands in a spinning machine. <P>SOLUTION: This apparatus for condensing the fiber strands is installed in the spinning machine. The fiber strand comes out of the pair of front rollers of a drafting device and enters a condensation zone disposed just downstream thereof. An air-permeable conveyor belt serves to convey the fiber strand through the condensation zone. The conveyor belt is guided in sliding motion on a static suction channel, the suction channel including a suction slit which is covered with the conveyor belt, the suction slit starts in close proximity to the pair of front rollers and ends at a nip line on the terminal of the condensation zone. The suction slit first lies along a circumference angle of ≥30° in the moving direction of the conveyor belt and follows the circumference of an upper roller by a certain distance and then deflects at an angle of ≥90° and continues in mutually different curves to the end. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION AND OVERVIEW The present invention relates to a spinning machine apparatus for condensing fiber strands, which comprises a front roller pair of a drafting device consisting of a bottom roller and a top roller, arranged downstream thereof. Including an air permeable transport belt for transporting the fiber strands through the condensation zone, a static suction channel for guiding the transport belt in a sliding motion, starting very close to the front roller pair, and arranged in the suction channel. And includes a suction slit covered by a transport belt and a nip delivery device for nipping the fiber strands at the end of the condensation zone.

When a drafted fiber strand is provided with a spin twist just downstream of a front roller pair of a drafting machine, a so-called spinning triangle occurs at the nip line of the front roller pair. This occurs because the drafted fiber strands leave a drafting device with a certain width and are twisted into a yarn with a relatively small diameter. Spun triangles contain side fibers that do not properly bond in the twisted yarn and therefore contribute little or no to the tensile strength of the spun yarn. Recently, a condensation zone has been arranged downstream of the drafting zone of the drafting device, which condensation zone is also bounded by a nip line. Only downstream of it is the yarn given its spin twist. The fibers are bundled or condensed in the condensation zone, where the feared spinning triangle is essentially narrower as the fiber strands are narrower as they leave the nip line furthest downstream. The spun yarn is more uniform then, tear resistant and less fluffy.

A device of the type mentioned above having a condensation zone arranged downstream of the drafting device is described in German published patent application 1
9846268 is a known technique. Draft fiber strands exiting the front nip line of the drafting device are deflected almost completely on their path to the suction slit, but nevertheless within this area before they reach the air-permeable transport belt. Have to bridge long distances without supports. However, the transfer area moved by the fiber strands from the pair of front rollers of the drafting device to the transport belt is, as indicated, extremely important. The changing position of the suction channel with respect to the front nip line leads to a deterioration of the yarn quality. The aim was therefore to project the suction tube as far as possible into the wedge-shaped gap of the front roller pair. However, this required a relatively small radius at the deflecting edge of the suction channel provided therein. But such a small radius
This is excluded because the transport belt is guided in a sliding movement and this sliding movement must be as smooth as possible.

The object of the invention is to improve the transition area of the fiber strands from the drafting device to the transport belt.

It is an object of the invention, according to the invention, that the suction slit first follows the circumference of the upper roller along the circumference of the transport belt along a circumference angle of at least 30 ° and by a distance therefrom, after which the suction slit forms an angle of at least 90 °. It was achieved by deflecting at and continuing with different curves until the end.

[0006] According to this embodiment, the fiber strands are very high on the transport belt after leaving the front nip line of the drafting device without the need for an unacceptably small radius due to the suction channels in the wedge gaps of the front roller pairs. Can be approached. In addition, the fiber strands are guided in this critical area in a much more defined manner than before, where as a result of the embodiment of the suction slit according to the invention, the air flow entering the suction slit is such that the air stream exiting the front nip line. Has a positive impact on top.
Subsequent deflections distributed over a large area of at least 90 ° are a direct compromise to the standard thread geometry of the ring spinning machine.

It is advantageous when there is a distance between the transport belt and the starting area of the suction slit, which is the starting area between the slide surface of the suction channel and the underside of the transport belt facing the slide surface. It means that there is a relaxing space in. Thus, the transport belt friction is noticeably reduced in this critical area, while at the same time the fiber fuzz generated in this same area is better sucked out.

It is also advantageous when the transport belt is arranged around the upper roller. The fiber strands are thus lightly nipped in this area, which contributes to a neat deposition of the fiber strands on the transport belt.

Finally, it is beneficial when the transport belt is also arranged on the periphery of the bottom roller. In this area, the transport belt runs in the opposite direction to the direction of movement of the transport belt, so that the transport belt is free of fiber dust in this manner.

[0010] These and further objects of the simplified description of the invention The drawings, features and advantages will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings. In the drawings: FIG. 1 is a cross-sectional side view of a device according to the invention, FIG. 2 is a view in the direction of arrow II of FIG. 1 for a transport belt and a suction channel, and FIG. 3 is an arrow of FIG. 1 for a condensation zone. FIG. 3 is a view in the direction III, and FIG. 4 is a partial view from FIG. 1 of the region of the front roller pairs of the drafting device according to a modified embodiment of the suction channel.

Detailed Description of the Drawings The schematically illustrated apparatus for condensing fiber strands 1 of Figures 1 to 3 is a component of a spinning machine, preferably a ring spinning machine.

The drafting device 2 is part of the device according to the invention, at least the front roller pair 3 of which consists of a drive bottom roller 4 and a top roller 5 which is pressed flexibly against this bottom roller 4. Although only a schematic is shown, the apron pair 6,7 is arranged upstream of the front roller pair 3 and the remaining components of the drafting device 2 are not shown.

In the drafting device 2, the sliver or roving 8 is drafted in the drafting direction A to a desired fineness. The drafting zone of the drafting device 2 ends at the front nip line 9 of the front roller pair 3.

A condensation zone 10 is arranged downstream of the front roller pair 3 for the reasons mentioned above. It comprises an air-permeable transport belt 11, which is preferably designed as a thin, tightly meshed woven belt, which transports the fiber strands 1 in the direction of movement B through the condensation zone 10.
The transport belt 11 is guided in a sliding motion on a stationary suction channel 12, which suction channel 12 extends over a plurality of spinning stations. The suction channel 12 is connected at various intervals via a vacuum conduit 13 to a vacuum source (not shown) for feeding several spinning stations at a time.

The suction channel 12 is provided with one suction slit 14 per spinning station, which suction slit 14 will be explained in more detail below. Each suction slit 14 is covered by a transport belt 11 and starts in close proximity to the front nip line 9 of the front roller pair 3.

The outlet side of the condensation zone 10 is a delivery device 15
Bounded by, the delivery device 15 includes a nip roller 16 which acts as a twist stop. The nip roller 16 nips the fiber strand to the delivery nip line 17 with respect to the transport belt 11,
1 is also nipped against the sliding surface of the static suction channel 12, so that the twist that is subsequently applied to the formed thread 19 does not go back to the condensation zone 10. The nip roller 16 drives the transport belt 11 and also the toothed belt 18
It is driven by the upper roller 5 via.

The produced yarn 19 is sent to the delivery nip line 17
Immediately downstream of that is given its spin twist. As a result, the yarn 19 is fed in the delivery direction C toward a twisting device (not shown), for example, a ring spindle.

The transport belt 11 is only partially guided over the suction channel 12 and is tensioned by a tensioning element 20 at a distance to the suction channel 12.

As already mentioned, the absence of a support during the transition of the fiber strand 1 from the front nip line 9 to the transport belt 11 is of particular importance. On the one hand the suction channel 12
Of the transport belt 1 should protrude into the wedge-shaped gap of the front roller pair 3 as far as possible, while on the other hand a smooth running of the transport belt 11 is required and therefore the transport belt 1
A sharp edged deflector for 1 should not be present in this region. The disadvantages of the prior art related thereto and mentioned above should be eliminated.

According to the invention, the starting area 21 of the suction slit 14 first follows the circumference of the upper roller 5 in the direction B of movement of the transport belt 11 along a peripheral angle of at least 30 ° and a certain distance therefrom. , Then suction slit 1
4 is deflected by an angle of at least 90 ° and continues with different curves to the end, so that the yarn 19 delivered to the twisting device (not shown) can be refitted during the standard spinning geometry. Stipulated. As can be seen in particular in FIG. 2, the above-mentioned starting area 21 additionally starts with a wide delta, so that the fiber strands 1 which normally cross transversely to the direction of travel B in the front nip line 9 are suction slits. The area of 14 is surely reached.

Due to this embodiment of the suction slit 14 according to the invention, the fiber strands 1 are transferred in a particularly reliable manner to the transport belt 11, which also sucks channels 12.
Will be transferred onto the slide surface. The air flow generated by the suction slit 14 according to the invention has a positive effect on the fiber strand 1 exiting the front nip line 9.

As can be seen in particular in FIG. 1, there is a distance between the suction slit 14 and the transport belt 11 in the starting area 21, and thus a loose space 22 is created between the two deflection areas. , This is the transport belt 11 on the one hand
It is advantageous due to the friction between the suction channel 12 and the suction channel 12, while on the other hand it is advantageous to keep the transport belt 11 free of fiber dust.

As can be further seen in FIG. 1, the transport belt 11 contacts the bottom roller 4. Transport belt 1
1 and the bottom roller 4 move in opposite directions in this area, so that the transport belt 11 is thus cleaned of the fiber dust that adheres to its outside.

FIG. 4 shows a portion of FIG. 1 with somewhat different embodiments of suction channel 412. The same reference numbers as above are also used, so long as the same elements as above are retained, so that repetitive description is not necessary.

The embodiment shown in FIG. 4 has a suction slit 41.
4, the starting region 421 of which is designed identically to the embodiment of FIGS. However, the difference from this embodiment is that in the embodiment of FIG.
Is to be guided in such a way that it is placed on the periphery of. The fiber strands are thus additionally nipped in this area, which improves the ordered deposition of the fiber strands 1 on the transport belt 11.

As can be seen further in FIG. 4, there is also a loose space 422 between the transport belt 11 and the suction slit 414.

[Brief description of drawings]

1 is a cross-sectional side view of a device according to the present invention.

2 is a view of the transport belt and suction channel in the direction of arrow II in FIG. 1;

3 is a view of the condensation zone in the direction of arrow III in FIG. 1;

FIG. 4 is a partial view from FIG. 1 of the region of the front roller pair of the drafting device according to a modified embodiment of the suction channel.

[Procedure amendment]

[Submission date] May 15, 2003 (2003.5.1)
5)

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (4)

[Claims] 1. A spinning machine apparatus for condensing fiber strands, comprising a front roller pair of a drafting apparatus comprising a bottom roller and a top roller,
Including a condensing zone located downstream thereof, including an air permeable transport belt for transporting fiber strands through the condensing zone, including a static suction channel for guiding the transport belt in a sliding motion, starting in close proximity to a pair of front rollers A suction slit (14; 414) starting region (14; 414), which includes a suction slit disposed in the suction channel and covered by a transport belt, and which includes a nip delivery device for nipping the fiber strands at the end of the condensation zone. 21;
421) follows in the direction of movement (B) of the transport belt 11, first around the upper roller (5) by some distance along a peripheral angle of at least 30 °, after which the suction slit 14 forms an angle of at least 90 °. A device characterized by being deflected by and continuing with different curves until the end. 2. Device according to claim 1, characterized in that there is a distance between the starting area (21; 421) of the suction slit (14; 414) and the transport belt (11). 3. The transport belt (11) is arranged on the periphery of the upper roller (5).
The device according to. 4. The transport belt (11) is arranged on the circumference of the bottom roller (4).
5. The device according to any one of 3 to 3.