JPH0375647B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a toothed card cylinder that is installed later in the direction of passage of a coarse web among a plurality of toothed card cylinders that sequentially rotate in the same direction in the direction of passage of a coarse web. The card cylinders that are inserted each form a walker with respect to the card cylinder in front, and the fibers of the coarse web, which fly away from the card cylinders under the effect of centrifugal force, reach in each case a wedge-shaped area between the card cylinders through a drop-in channel. The present invention relates to a device for producing a sliver that impinges on a continuously moved and suctioned air collection surface.

[Conventional technology]

In order to produce roving yarn from a rough web, the rough web is first subjected to a carding process by at least one toothed card cylinder, before dividing the rough web into a plurality of slivers and combining these slivers into roving yarn. . The uniformity of these rovings is therefore related to the uniformity of the sliver, which is insufficient, especially at high material throughputs.

In the production of random webs, in order to ensure good opening of the coarse web and uniform fiber distribution to the suctioned collection surface, several card cylinders rotating in the same direction are arranged one behind the other, each with a It is known to comb the fiber material conveyed by a card cylinder from a card cylinder in front of it by the action of a walker, and to throw the uncombed fibers immediately following the combing process onto a collecting surface below the card cylinder (Austrian patent No.
379619 specification). Thereby, the coarse web is opened into a plurality of fiber substreams, which are deposited one after the other on the collecting surface, so that even though the material throughput through the device is relatively high, the fiber substreams contain only a small number of fibers. density, which is a prerequisite for high web uniformity in connection with the deposition of multiple fiber layers.

In order to improve the cohesion of the roving fiber bundles formed from the fiber web or from fibers that are deposited in free flight onto the conveyor belt, the fibers or the conveyor belt receiving the fiber web, relative to the direction of its movement, are By providing inclined suction zones and blowing air through the conveyor belt between these suction zones, the fibers of the roving are separated by zone-by-zone fiber blowing and suction, and the suction zone is blown relative to the conveying direction of the conveyor belt. It is also known (US Pat. No. 2,274,425) to exert a transverse force on the fibers and to create a rotational moment by means of tilting, thereby effecting a bonding of the fiber bundles of the individual rovings. In this known device, the distribution of the fibers within the individual rovings is significantly adversely affected, so that the production of particularly uniform rovings is not possible. Furthermore, the possible passage capacity is also limited.

In order to obtain a high uniformity of the drawn sliver, which is necessary for the subsequent formation of the drawn sliver, several slivers are fed into a common drawing mechanism, where the drawn sliver is formed from the sliver and passed through the rotating plate. The data is stored in the can via the . Since the through capacity of the known devices for producing sliver is relatively small compared to the through capacity of the drawing mechanism, the sliver must first be stored in a can and then sent to the drawing mechanism for forming a drawn sliver, and the sliver must be individually After processing the sliver in a can, the empty can must be replaced by a can full of sliver, which also causes interruptions in the production of the drawn sliver during automatic can exchange, which involves high construction costs.

[Problem to be solved by the invention]

The problem on which the invention is based is therefore to combine the uniformity obtained with regard to fiber deposition during the production of random webs into a sliver with sufficient throughput to process the sliver directly into drawn sliver without intermediate storage. It is also necessary to guarantee the manufacture of

[Means to solve the problem]

Starting from a device of the first type mentioned, it is provided according to the invention to solve this problem, in which the collection surface in the area of the drop-in channel is sucked in only section by section, depending on the width of the sliver to be produced. In the area of the individual drop channels, the suction areas are arranged transversely and spaced apart from each other at right angles to the direction of movement of the collection surface.

〔Effect of the invention〕

Due to the area-specific suction of the collection surface in the area of the drop channel, the respective thrown-off fibers are not deposited evenly over the entire width of the collection surface, but only in bands depending on the suction area. As a result, individual slivers are obtained as is, and there is no need to later divide the fiber web into a plurality of slivers.
The advantages of opening the coarse web into several sub-streams and flying them sequentially onto the collection surface for deposition are maintained in the band-like deposition of fibers on the collection surface, so that large amounts of material can pass through. Nevertheless, individual slivers can be produced with a high degree of uniformity.
The area-by-area suction of the collection surface required to separate each of the fiber sub-streams to be thrown away does not impair uniform fiber deposition in the area of the individual suction areas. The fibers are carried by the suction air stream to the collection surface and held there, and the fibers that reach the extent of the unsuctioned intermediate zone are suctioned into one or the other of the following suction zones, so that the mutual spacing of the suction zones is comparable. Clear separation of the slivers is achieved, even if the target is small. The random state of the fibers within the fiber bundles of the individual slivers provides the advantage that the rovings made of the slivers are easily opened into individual fibers.

In order to form individual suction zones in the area of the drop channel, the suction zones can be separated from one another by an intermediate piece following the collection surface. In the area of this intermediate bar, the collection surface is covered against the suction air flow.
Another possibility for suctioning the collection surface zone by zone is to separate the suction zones by unvented parts of the collection surface. In this variant, too, non-suction areas are provided between the individual suction zones.

Due to the large amount of material passing through, with the device according to the invention it is possible not only to obtain a sliver with the desired sliver weight, but also to produce it at high outlet velocities, so that for the device for the production of drawn slivers, It is sufficient to provide a conventional drawing mechanism after the sliver production device according to the invention. Intermediate storage of the sliver in cans is therefore unnecessary, and the disadvantages associated with cans are thereby also eliminated.

〔Example〕

An embodiment of the invention is shown in the drawing.

In the illustrated sliver production device, the rough web passes through a material inlet conventionally consisting of a feed roller 1 and a recessed table 2, followed by a plurality of card cylinders 3, 4, 5 rotating in the same direction, 6. Beneath these card cylinders 3 , 4 , 5 and 6 extends a ventilation collecting surface 7 which is constructed as a circulating conveyor belt and is sucked in via a suction box 8 . The card cylinders 3, 4, 5 and 6 have a cover 9 against the collection surface 7, between which a drop passage 10 is formed leading to a wedge-shaped area between the card cylinders. These drop passages 10
follows the already deposited fiber layer by means of guide walls on the entry and exit sides of the collection surface 7, so that the dosing channel 10 is protected against the harmful effects of lateral air currents in the area of the collection surface 7. It's sealed.

The velocity of the air flow in the dropping passage 10 can be matched to the dropping passage of the fibers, while the fibers are captured by the feeding air stream while separating them from the card cylinders 3, 4, 5 and 6, so that the side far from the collection surface 7 is A blowing nozzle 11 is provided on the side of the card cylinders 3, 4, 5 and 6 located at the side of the card cylinder, and the blowing air passes through the narrowest gap between the card cylinders into the dropping passage 10.
flows into.

Card cylinders 3, 4, 5 and 6 immediately follow one after another, so that each succeeding card cylinder forms a walker of the preceding card cylinder. The coarse web fed to the card cylinder 3 is thus partially combed by the card cylinder 4 rotating in the same direction, and the fibrous material not picked up by the card cylinder 4 is thrown into the drop channel 10 between the card cylinders 3 and 4. and is deposited on the collection surface 7. The fibrous material sent forward via the card cylinder 4 is divided into a partial stream to be dumped again in the area of the card cylinder 5 and a partial stream to be sent forward, the latter partial stream being divided again by the card cylinder 6. , the fiber layer to be deposited on the collection surface 7,
It is composed of a plurality of fiber sub-streams each having a relatively low fiber density.

In order to be able to increase the opening of the coarse web, each of the card cylinders 3, 4, 5, and 6 is provided with a walker 12 and a stripper 13, respectively, on the peripheral side remote from the collection surface 7. Comes with it. A portion of the covering fibers of each card cylinder is combed by the walker 12, and the walker 12
The fibers collected by the stripper 13 are delivered to the stripper 13 and supplied to the card cylinder again. The covering fibers of the individual card cylinders are therefore already opened before being fed to the next card cylinder, and at the same time the irregularities of the fibers are evened out.

In order to form a plurality of slivers and to ensure a ribbon-shaped fiber deposit on the collection surface 7, the outlet region is shown in FIG.
The collection surface 7 is suctioned only zone by zone, the individual suction zones 14 being spaced apart from one another and arranged transversely at right angles to the direction of movement of the collection surface 7 . According to FIGS. 1 to 3, these suction areas 14 are separated from one another by an intermediate bar 15 and adjoin the collection surface 7 on the side facing away from the drop channel 10. The fibers thrown off from the individual card cylinders 3, 4, 5 and 6 are therefore drawn onto the collection surface 7 only in the area of the suction area 14 between the intermediate bars 15, so that the fibers are deposited in a strip. Thus, a sliver 16 with high uniformity is formed.

Another possibility of separating the suction areas from each other in the area of each dosing channel 10 is shown in FIG. According to this embodiment, the collection surface 7 that ventilates over its entire width is not covered in a band shape against the suction air flow, but this collection surface itself forms the band-shaped non-ventilated portion 17. , a fiber deposit in the form of a sliver 16 takes place.

As can be seen in FIG. 5, a large number of slivers 16 are formed in the device 18 for producing slivers from a rough web 19 according to the invention, exit the device 18 at mutually spaced intervals, and are grouped into subgroups and each pressed into tablets. It is supplied to the mechanism 20. A common drawing of the sliver 16 fed to the individual drawing devices 20 results in each drawing sliver 21, which is stored in a can 22 according to the exemplary embodiment. Drill mechanism 20
immediately follows the device 18, so that intermediate storage of the sliver 16 in cans is eliminated and a continuous supply of the sliver 16 to the drawing mechanism 20 takes place;
This allows continuous production of the drawn sliver 21.

[Brief explanation of drawings]

Fig. 1 is a schematic longitudinal sectional view of an apparatus for producing sliver from a rough web according to the present invention, Fig. 2 is a partially cutaway plan view thereof, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 The figure is a sectional view corresponding to FIG. 3 of a modification of the collection surface, and FIG. 5 is a schematic plan view of an apparatus for manufacturing a drawn sliver using the apparatus according to the present invention. 3-6... Card cylinder, 7... Collection surface, 1
0...Drop passage, 14...Suction area, 16...Sliver, 19...Rough web.

Claims (1)

[Claims] 1. Of a plurality of toothed card cylinders that rotate in the same direction sequentially in the direction of passage of the coarse web,
The card cylinders arranged later in the direction of passage of the coarse web form respective walkers with respect to the card cylinders in front, and the fibers of the coarse web flying away from the card cylinders under the action of centrifugal force enter the wedge-shaped area between the card cylinders. In the case of the suctioned air collecting surface which is continuously moved through the respectively reaching dosing channel, in the area of the dosing channel 10 the collecting surface 7 is divided in sections according to the width of the sliver 16 to be produced. The suction area 14 in the area of the individual drop passage 10 is located at the collection surface 7.
Apparatus for producing sliver from a coarse web, characterized in that the slivers are arranged side by side and spaced apart from each other at right angles to the direction of movement of the slivers. 2. Device according to claim 1, characterized in that the suction areas (14) in the region of the individual dosing channels (10) are separated from one another by an intermediate bar (15) adjoining the collection surface (7). 3. Device according to claim 1, characterized in that the suction areas (14) in the region of the individual drop channels (10) are separated from each other by non-ventilated parts (17) of the collection surface (7). 4. The sliver production device 18 is characterized in that it is followed by a drawing mechanism 20 which directly takes over at least part of the sliver 16 coming out of this device 18,
Apparatus for producing a drawn sliver from a plurality of slivers using a sliver production apparatus according to one of claims 1 to 3.