EP0298519A1 - Device and apparatus for depositing a textile sliver in a can - Google Patents

Abstract

In a known process and device, the card sliver is introduced into a rotary depositing tube (4) by means of a current of compressed or aspirated air during draw-in stage and conveyed continuously through the tube to the can (2) during a depositing stage. The drawback of this process is that dust particles and short fibres are conveyed to the can together with the card sliver or escape to the surroundings. In the process according to the invention, short fibres and dust particles are prevented from escaping by generating an aspirated air current in the depositing tube during the depositing stage in the opposite direction to the direction of transport of the card sliver. The process and device are useful in installations in the textile industry in which card slivers are deposited temporarily in cans.

Description

The invention relates to a method for depositing a textile sliver into a can, in which the sliver is drawn into a depositing tube by means of a compressed or suction air flow and then continuously transported through the depositing tube into the can in a depositing phase.

The invention also relates to a device for performing the method, with a turntable, to which a deposit tube is assigned, at the discharge end of which a pair of pressure rollers is arranged, and with a compressed gas injector for drawing in the fiber sliver.

After nonwovens removed from a card have been formed into a fiber band, these fiber bands are generally deposited in so-called spinning cans before further processing. Such a device is known from US-PS 43 18 206 (CH-PS 639 628). The turntable of the known device is shielded by a fixed hood, the space under the hood being connected to a suction line. The delivery tube protrudes with the delivery end through the plane of the turntable into the spinning can, the pair of pressure rollers being arranged on the underside of the turntable. The discharge end, which is relatively close to the pair of pressure rollers, is provided with outlet openings which open into the space enclosed by the cover and the turntable. Due to the negative pressure generated in the enclosed space by means of the suction line, the sliver is drawn in through the laying tube up to the pressure rollers. As an alternative to a suction line, a compressed gas injector can also be provided.

When the fiber sliver is drawn into the laying tube, dust and short fibers are sucked out briefly by the suction flow. The outlet openings are clogged relatively quickly by short fibers. In addition, the suction can essentially only be realized during the drawing-in phase, since otherwise there is a risk that parts of the sliver are sucked out laterally from the conveyor nip of the pressure rollers.

The invention is therefore based on the object of improving a method and an associated device of the type mentioned in such a way that, with improved drawing-in properties, effective dedusting of the fiber sliver can also be carried out in the laying phase of the fiber sliver.

This object is achieved in that a suction air flow is generated in the laying tube during the laying phase, which is directed against the transport direction of the sliver.

From the beginning, this suction air flow is not generated for transport purposes, but essentially exclusively for venting and removing dust particles and short fibers. In this way, the air flow used to insert the sliver into the laydown tube cannot be impaired by short fibers or dust particles. The suction air flow can also be maintained at full strength in the laying phase, since no outward air flow is generated at the conveying gap between the pressure rollers.

With regard to the device, the object is achieved according to the invention by a suction connection which can be connected to a vacuum device and which, viewed in the transport direction, is at a distance from the end of delivery Storage tube is arranged. As a result, the suction air flow directed against the transport direction is generated in the storage tube in a simple manner.

According to a preferred embodiment, a first compressed gas injector is arranged directly in front of the pair of pressure rollers and behind the discharge end of the delivery tube and a second pressure gas injector, viewed in the transport direction, at a distance before the delivery end of the delivery tube, with a gap between the delivery end of the delivery tube and the input of the first pressure gas injector is trained. This has the advantage that when the sliver is drawn in it is ensured that the sliver is always inserted into the conveyor nip of the pair of pressure rollers, with an even stronger drag air flow for pulling in the sliver being able to be achieved in the pulling-in phase. The gap has a double function. The gap on the one hand brings about a pressure equalization when the sliver is drawn in, so that no conveying air can flow into the inlet of the first compressed gas injector from the laying tube. As a result, a larger pressure difference can be built up in the first pressurized gas injector, which enables the sliver to be drawn into the conveying gap between the two press rollers even more reliably. On the other hand, air for the suction air flow can enter the laying pipe through the gap in the laying phase.

It is advantageous if a compressed air connection line is passed through the first rotary coupling, for the first compressed gas injector arranged at the discharge end of the storage tube. In this way, the storage tube with the associated compressed air connection line of the Turn the most compressed gas injector around the rotary coupling without having to turn the part of the compressed air connection line that leads from the outside to the first rotary coupling.

A structurally simple solution is obtained if the rotary coupling has two rotating parts which can be rotated relative to one another and which enclose a compressed air space which is sealed off from the outside and to the storage tube, a connection bore opening into the compressed air space being provided on both rotating parts for a compressed air line.

According to a preferred embodiment of the invention, the rotating parts of the rotary coupling are designed as sleeves which are essentially coaxially one inside the other and are connected to the respective tube and can be rotated relative to one another by means of two radial bearings which are spaced axially from one another and sealed, the compressed air space being delimited by the radial bearings and the sleeves, and wherein the connection bore in the outer sleeve is designed as a radial bore, while the connection bore in the inner sleeve is essentially designed as an axial bore. This makes it particularly easy to achieve that the compressed air connection line is passed through the rotary coupling without pressure losses occurring.

In such devices, in which an approximately S-shaped pipe bend is arranged between the transport tube and the first rotary coupling, which is rotatably connected to the end of the transport tube via a second rotary coupling and rotatably connected to the storage tube with the first rotary coupling, it is advantageous that a compressed air line is also passed through the second rotary coupling. In these devices, the turntable for depositing the sliver in the jug is not only rotated about an axis that passes through the center of the turntable, but is stored in a lid that is his on the one hand rotates about an axis which is arranged eccentrically to the center of the turntable. Alternatively, the can can rotate around the latter axis instead. This results in cycloid-like deposit patterns when the sliver is laid down. Due to the fact that a compressed air line is also passed through the second rotary coupling, the actual compressed air connection for the first compressed gas injector can be made stationary to the transport pipe, the subsequent compressed air line with the subsequent pipe sections, such as pipe elbow and storage pipe, being able to rotate with each other.

It is particularly advantageous if the suction connection is arranged in the region of the second rotary coupling. The suction connection is in this way close enough to the discharge end of the storage tube and can nevertheless be provided at the non-rotating end of the transport tube. In the conveying direction upwards from the second rotary coupling, the suction air flow always acts in the transport direction of the sliver; only between this rotary coupling and the outlet of the deposit tube does the suction air flow towards the sliver.

According to a preferred embodiment, the suction connection is formed on a part of the second rotary coupling which is connected to the transport pipe. This is advantageous because the pipe sections projecting into the rotary coupling must always be slightly spaced apart because of the possibility of being able to be rotated relative to one another. This automatically creates a gap that only needs to be adapted to the desired suction air flow.

A particularly simple attachment of the suction connection is obtained if the suction connection is designed as a flange attached to the second rotary coupling, to which the transport pipe and a suction line are connected are.

A particularly uniform suction of the short fibers and dust particles is made possible by the fact that between the end of the transport pipe opening into the rotating coupling and the second rotating coupling a gap is formed which is sealed to the outside by the flange and which is connected to the suction line by flow. As a result, an annular gap is achieved which enables the short fibers and the dust particles to be sucked off around the sliver, an annular flow surrounding the outer circumference of the sliver being able to form in the laying tube and the elbow.

• Fig. 1 in einer Seitenansicht eine Übersichtsdarstel­lung einer erfindungsgemäßen Vorrichtung, bei der einige Teile weggebrochen sind,
• Fig. 2 in einer Draufsicht eine schematische Prinzip­skizze mit einem Ablegemuster des Faserbandes bei einer Vorrichtung nach Fig. 1,
• Fig. 3 eine Detailansicht III in fig. 1,
• Fig. 4 eine Schnittansicht durch einen Teil der Vor­richtung entlang der Linie IV-IV in Fig. 3 und
• Fig. 5 das Detail V in Fig. 1 in einer teilweise ge­schnittenen Ansicht.

An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. Show it:

• 1 is a side view of an overview of a device according to the invention, in which some parts have broken away,
• 2 is a plan view of a schematic diagram with a laying pattern of the sliver in a device according to FIG. 1,
• Fig. 3 is a detailed view III in fig. 1,
• Fig. 4 is a sectional view through part of the device along the line IV-IV in Fig. 3 and
• Fig. 5 shows the detail V in Fig. 1 in a partially sectioned view.

1 shows, in a partially cut and partially broken away side view, a device 1 according to the invention for depositing a textile sliver into a can 2.

Only the top left of can 2 can be seen. The lower part of the can and large parts of the right half of the can have broken away for the sake of clarity.

Above the can 2, a turntable 3 is arranged, to which a storage tube 4 is assigned. The deposit tube 4 is designed to be rotatable and, on the one hand, is held with its upper end in a first rotary coupling 5, while the lower, discharge end 7 faces a rotatable disk 6. The rotatable disc 6 is mounted within a larger rotatable disc 8, which in turn is rotatably supported in an outer edge 9.

As can be seen from the schematic illustration in FIG. 2, both the small rotatable disk 6 and the large rotatable disk 8 are each arranged to be rotatable about their own center. The sliver leaving the discharge end 7 is deposited in an exploded, helical pattern.

The deposit tube 4 has at its discharge end 7 a pair of pressure rollers 10, from where the sliver passes through a small rotating disc 6 into the interior of the can 2 through a mouthpiece tube 11 adapted to the contour of the pair of pressure rollers 10.

In Fig. 1 the laying tube 4 is shown in two positions (in a solid line and in a broken line).

In the left position of the deposit tube 4 in FIG. 1 it can be seen that the pressure rollers 10 are mounted on the rotatable disc 6 and are driven by a shaft 12. The pressure rollers 10 and the rotatable disks 6 and 8 are driven in a conventional manner and are therefore not shown.

Arranged above the first rotary coupling 5 is an essentially S-shaped pipe bend 13 which can be rotated relative to the support tube 4. The upper end of the pipe bend 13 is connected to a transport pipe 15 via a second rotary coupling 14.

The transport tube 15 can for example lead from a card, not shown here.

As is known per se, during operation of the device 1, on the one hand the pipe elbows 13 rotate about the axis 16 of the can and on the other hand the deposit tube 4 about the axis 17 of the small rotatable disc 6 and also about the axis 16. The axes of the two Swivel couplings 5 and 14 coincide with axes 17 and 16, respectively.

As shown in FIG. 1, a first pressurized gas injector 18 is connected between the discharge end 7 and the pair of pressure rollers 10, which introduces the sliver into the conveyor nip between the two pressure rollers 10. The first pressurized gas injector 18 is designed to converge in the interior and ends in a longitudinal gap 37, which is arranged transversely to the delivery gap between the two pressure rollers 10. The compressed air is fed through an annular gap nozzle (see also compressed gas injector 20). A gap 19 is formed between the first compressed gas injector 18 and the discharge end 7 of the deposit tube 4, through which gap air can enter or exit.

Seen in the transport direction T, a second compressed gas injector 20 is arranged at a distance from the discharge end 7 of the deposit tube 4. More specifically, the second compressed gas injector 20, as seen in the transport direction, is arranged in front of the second rotary coupling 14 in the transport pipe 15. The compressed gas injector 20 is designed as an annular nozzle and, together with the first compressed gas injector 18, is connected to a common compressed air source 21. A first connecting line 22 leads from the compressed air source 21 to the first compressed gas injector 18 and a second connecting line 23 leads to the second compressed gas injector 20. While the second connecting line 23 leads directly to the second compressed gas injector, which is arranged in a stationary manner with the transport pipe 15, the first connecting line leads via the second rotary coupling 14 and via the first rotary coupling 5 to the first compressed gas injector 18.

As better shown in FIGS. 3 and 5, the two rotary couplings 5 and 14 are constructed essentially identically and each have two rotating parts 24 and 25 which can be rotated relative to one another. The two rotating parts 24 and 25 enclose a compressed air space 26, on both Rotary parts 24 and 25 each have a connection bore 27 and 28 opening into the compressed air space 26. The two rotating parts 24 and 25 are designed as sleeves which are essentially coaxially one inside the other and connected to the respective tube. The outer sleeve 24 can be rotated relative to the inner sleeve 25 by means of two axially spaced deep groove ball bearings 29 and 30. The grooved ball bearings 29 and 30, as can be seen in particular from FIG. 5, are sealed off from the compressed air space 26 with seals 31. The compressed air chamber 26 is therefore limited by the outer sleeve 24, the inner sleeve 25 and the deep groove ball bearings 29 and 30 or their seals 31. The connection bore 27 in the outer sleeve 24 is designed as a radial bore, while the connection bore 28 in the inner sleeve is essentially designed as an axial bore, wherein it can be seen in the drawing that the connection of the first connection line 22 to the axial bore 28 also takes place radially .

1, it can be seen that a suction connection 32 is provided in the region of the second rotary coupling 14. More specifically, the suction connection is formed directly on the outer sleeve 24 of the second rotary coupling 14, which is fixedly connected to the transport pipe 15.

The more precise design of the suction connection 32 can be seen in FIGS. 3 and 4. It can be seen there that both the transport pipe 15 and a suction pipe 34 are connected to a flange 33 on the upper side of the second rotary coupling 14. Between the end of the transport tube 15 opening into the second rotary coupling 14 and the rotary coupling itself, a gap 35 is formed which is sealed off from the outside by the flange 33 and which is in flow communication with the suction tube 34. For this purpose, the gap 35 also extends below the suction pipe 34. The gap 35 is with the interior of the pipe bend mers 13 flow-connected and sealed from the compressed air space 26 by the inner sleeve 25 of the rotary coupling 14.

The suction pipe 34 is arranged behind the transport pipe 15 in FIG. 1 and lies slightly above the transport pipe.

The mode of operation of the invention is explained in more detail below.

To pull the fiber sliver into the device 1 up to the pair of pressure rollers 10, the two compressed gas injectors 18 and 20 are fed with compressed air by the compressed air source 21 and via the connecting lines 22 and 23. At the same time, the two disks 6 and 8 each rotate about their axes 17 and 16, which is why the support tube 4 and the elbow 13 also rotate about these axes. So that the first compressed gas injector 18 can be supplied with compressed air in spite of this rotation, the first connecting line 22 leads through the rotary coupling 14 and 5, respectively. The respective connecting bores 27 and 28 can rotate relative to one another without the connecting line 22 being twisted.

By feeding in compressed air by means of the compressed gas injectors 18 and 20, a compressed air flow is generated in the transport pipe 15, in the downstream pipe bend 13 and in the storage pipe 4. A suction air flow directed in the transport direction T forms in front of the second compressed gas injector 20. This suction air flow draws in the fiber sliver up to the second compressed gas injector 20, after which the fiber sliver insertion is gripped by the compressed air flow and is conveyed through the second swivel coupling 14, the elbow 13, the first rotating coupling 5 and the laying tube 4. The compressed air in the deposit tube 4 can escape through the gap 19, so that no overpressure can build up at the input of the first compressed gas injector 18, which would reduce the effect of the first compressed gas injector. The first compressed gas injector 18 draws in the incoming sliver end and conveys it into the conveying gap between the two pressure rollers 10 rotating in the direction of the arrow (see dashed line). From there, the sliver is conveyed further through the mouthpiece tube 11 through the smaller rotatable disc 6 into the can 2.

The pull-in phase has now ended. The two compressed gas injectors 18 and 20 are switched off while the suction pipe 34 remains connected to a vacuum device 36. The suction flow is weaker than the pressure flow, so that the latter outweighs the former in the pull-in phase. As a result, a suction flow is formed in the suction pipe 34, which continues via the suction connection 32 both into the transport pipe 15 and into the pipe elbow 13 and the storage pipe 4. As a result, a suction flow is formed in the suction pipe 34, which continues via the suction connection 32 both into the transport pipe 15 and into the pipe elbow 13 and the storage pipe 4.

The direction of the suction flow is shown by the arrows S. It can be seen that, seen in the transport direction T, the suction direction S in front of the suction connection 32 is aligned with the transport direction T, while, seen in the transport direction T, the suction direction S is opposite to the transport direction T behind the suction connection 32. This means that the sliver, which is conveyed by the pressure rollers 10 in the now initiated laying phase, moves in the region of the pipe bend 13 and the laying pipe 4 along an opposite air flow. This opposite air flow begins in the area of the discharge end 7 at the Gap 19 between the discharge end 7 and the first compressed gas injector 18 and ends at the suction connection 32.

The counter-air flow has the effect that practically no short fibers or dust particles can escape in the region of the discharge end 7, the pair of pressure rollers 10 and the mouthpiece tube 11. It is therefore not only achieved that the fiber sliver is already deposited essentially free of short fibers and dust particles in the can 2, it is also avoided that short fibers or dust particles can get into the environment. For this purpose, the vacuum device 36 can have a separator in the form of a filter.

The slivers are deposited in the can 2 in a pattern, as can be seen in FIG. 2.

The mouthpiece tube 11 is preferably made of a plastic and is arranged so close to the contour of the pair of pressure rollers 10 that the best possible seal between the pair of pressure rollers 10 and the mouthpiece tube 11 results.

Claims (12)

1. A method for depositing a textile sliver into a jug, in which the sliver is drawn into a rotatable deposit tube by means of a compressed or suction air flow and then continuously transported through the deposit tube into the can in a deposit phase, characterized in that during during the laying phase, a suction air flow (S) is generated in the laying pipe (4), which is directed against the transport direction (T) of the sliver. 2. Device for performing the method according to claim 1, with a turntable (3), which is assigned a storage tube (4), at the discharge end (7) of which a pressure roller pair (10) is arranged, and with a compressed gas injector (18) for drawing in of the fiber sliver, characterized by a suction connection (32) which can be connected to a vacuum device (36) and which, viewed in the transport direction (T), is arranged at a distance from the discharge end (7) of the laying tube (4). 3. Apparatus according to claim 2, characterized in that a first pressurized gas injector (18) is arranged directly in front of the pair of press rollers (10) and behind the discharge end (7) of the storage tube (4), that a second pressurized gas injector (20), in the transport direction (T) seen, is arranged at a distance in front of the discharge end (7) of the deposit tube (4), and that a gap (19) is formed between the discharge end (7) of the deposit tube (4) and the input of the first compressed gas injector (18) . 4. Device according to one of claims 2 to 3, wherein the storage tube (4) via a first rotary coupling (5) is connected to a transport tube (15), characterized in that the second compressed gas injector (20), in trans Port direction (T) seen, is arranged in front of the first rotary coupling (5) in the transport tube (15). 5. Device according to one of claims 2 to 4, characterized in that a compressed air connection line (22) is guided through the first rotary coupling (5) for the first compressed gas injector (18) arranged at the discharge end (7) of the storage tube (4). 6. Device according to one of claims 2 to 5, characterized in that the rotary coupling (5, 14) has two mutually rotatable rotary parts (24, 25) which include an outwardly and to the storage tube (4) sealed compressed air space (26) A connection bore (27, 28) opening into the compressed air space (26) for a compressed air line (2) is provided on each of the two rotating parts (24, 25). 7. Device according to one of claims 2 to 6, characterized in that the rotary parts (24, 25) of the rotary coupling (5 or 14) as substantially coaxially one inside the other with the respective tube (4, 13 or 13, 15th ) connected sleeves are formed, which can be rotated relative to one another by means of two axially spaced and sealed radial bearings (29, 30), the compressed air space (26) being delimited by the radial bearings (29, 30) and the sleeves (24, 25), and wherein the connection bore in the outer sleeve (24) is designed as a radial bore (27), while the connection bore (28) in the inner sleeve (25) is designed as an axial bore. 8. Device according to one of claims 2 to 7, in which an approximately S-shaped pipe bend (13) is arranged between the transport pipe (15) and the first rotary coupling (5), which is rotatable via a second rotary coupling (14) with the end the transport pipe (15) and over the first Rotary coupling (5) is rotatably connected to the support tube (4), characterized in that a compressed air line (22) is also passed through the second rotary coupling (14). 9. Device according to one of claims 2 to 8, characterized in that the suction connection (32) is arranged in the region of the second rotary coupling (14). 10. Device according to one of claims 2 to 9, characterized in that the suction connection (32) is formed on a part (33) of the second rotary coupling (14) connected to the transport tube (15). 11. Device according to one of claims 2 to 10, characterized in that the suction connection (32) is designed as a flange (33) attached to the second rotary coupling (14), on which the transport tube (15) and a suction line (34) are connected. 12. Device according to one of claims 2 to 11, characterized in that between the end of the transport pipe (15) opening into the rotary coupling (14) and the second rotary coupling (14) a gap (33) sealed to the outside ( 35) is formed, which is fluidly connected to the suction line (34).

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