EP0261330B1 - Apparatus to compress and to automatically introduce a textile fibre sheet to a conveying slot - Google Patents

Description

The invention relates to a device for compressing and automatically inserting a textile fiber strip into a conveying nip, in particular a roller nip, with a transport channel, a flow generator for forming a gas flow in the transport channel, and an insertion mouthpiece adjoining the transport channel, one with the transport channel aligned, tapering in the direction of flow mouthpiece channel and in the mouth area has at least one lateral slot-like opening for the outflow of the gas stream from the mouthpiece channel.

From US-A 4 318 206 (Fig. 3) a device of this type is known, in which a series of slots is cut in the mouthpiece, which lie in planes perpendicular to the direction of transport. These slits thus run transversely to the longitudinal direction of the mouthpiece channel and form a kind of slit grille in it over a little more than half of its circumference, through which the transport gas can escape laterally. The mouth of the mouthpiece channel is formed in the known device as a flat, circular opening without adaptation to the contour of the rollers delimiting the conveyor gap. Fibers remain on the edges of the slits running transversely to the transport direction. The narrow circular mouth, in conjunction with the transverse slots, is an insurmountable obstacle to the unavoidable thickening of the sliver. This can, with unfavorable properties of the sliver, lead to blockages of the mouthpiece in the known device, which prevent reliable, automatic insertion of the sliver into the conveying gap and even compression of the sliver.

A device is also known from US Pat. No. 4,318,206 (FIGS. 1 and 2) in which the mouthpiece channel does not taper in the direction of transport, but only continues the transport channel. In the mouthpiece area, this channel has rows of bores around its circumference through which the transport gas can escape. In this embodiment, the frontal contour of the mouthpiece is adapted to a small extent to the contour of the rollers forming the conveying gap. Since the mouthpiece channel is just as wide as the transport channel here, so that the fiber sliver is not compressed in any way, reliable introduction of the large-diameter fiber sliver into the nip cannot be carried out without problems. This is all the more so because the sliver is swollen by the transport gas flowing out in all directions and gets stuck on its periphery at the edges of the holes.

The invention is based on the object of designing a device of the type described at the outset in such a way that trouble-free automatic insertion of a textile fiber band into a conveyor nip is possible with simultaneous compression of the fiber band.

This object is achieved in that the opening is formed as a longitudinal gap extending from the mouth of the mouthpiece channel in its longitudinal direction in a plane substantially perpendicular to the plane of the conveying gap, and in that the mouth-side contour of the insertion mouthpiece on both sides of the longitudinal gap is the contour of the conveying gap forming components, especially rollers, is aligned.

The design of the outflow path for the transport gas as a longitudinal gap running in the transport direction has the advantage that no resistances running transversely to the transport direction inhibit the movement of the textile fibers. Unavoidable thickening in the sliver can expand radially into the longitudinal gap without clogging the mouthpiece channel. Nevertheless, the sliver is reliably compressed, because at the mouth the sliver in the plane of the conveyor gap through the side walls of the conveyor gap or the mouthpiece channel and in the plane perpendicular to it through the contour of the components forming the conveyor gap, in particular the press rolls, engaging in the mouthpiece contour. is limited. The device according to the invention therefore on the one hand allows the sliver a certain freedom for radial expansion in order to avoid blockages; on the other hand, it ensures reliable compression of the belt directly at the entry into the conveyor gap. If fibers inadvertently emerge to the side through the longitudinal gap, they are immediately grasped by the surfaces of the press rolls running in the conveying direction and reinserted into the fiber sliver. The effects described are particularly important at the beginning of the sliver, where it often consists of individual pieces. These accumulate in the area of the mouth, but can expand into the longitudinal slot and are caught by the rollers as soon as enough fiber material has accumulated. This enables trouble-free threading of the beginning of the sliver. The invention is primarily intended for this application.

If the conveyor gap is formed by a pair of rollers, a longitudinal gap is expediently provided on both sides of the level of the conveyor gap. As a result, the belt can expand transversely to the conveying gap in both directions and is nevertheless compressed at the mouth against these two directions of expansion.

If, on the other hand, the conveying gap is formed by a roller and a stationary counter body, the longitudinal gap is expediently only provided on the roll side in the insertion mouthpiece.

The mouthpiece channel, which has a circular cross section, advantageously ends at a small distance in front of the mouth and is connected to it solely by the longitudinal gap which also forms the mouth, the width of the longitudinal gap being less than the diameter of the last section of the mouthpiece channel. In this embodiment, the longitudinal gap defines the width of the Sliver parallel to the plane of the conveyor gap, the longitudinal gap in this plane compressing the sliver as it emerges from the mouthpiece channel, while the compression in the plane perpendicular thereto is then taken over by the components forming the conveyor gap.

It is expedient if the longitudinal gap, viewed in the direction of transport, has a radially freely opening initial section. Since the contour of the mouthpiece in the region of the longitudinal gap is adapted to the contour of the parts forming the conveying gap, a radially freely opening initial section of the longitudinal gap ensures an unimpeded outflow of the transport gas.

The width of the longitudinal gap can be in millimeters in the order of the gram weight of the sliver per meter, so that with a sliver of 5 g / m the width of the longitudinal gap is approximately 3-5 mm, preferably 4 mm.

In the mouthpiece channel, a gradual taper towards the mouth has proven to be beneficial. In contrast, the transport channel tapers conically in the direction of the mouthpiece channel.

In the known device according to US Pat. No. 4,318,206, the flow generator is a suction fan which sucks air out of a closed space surrounding the insertion mouthpiece, so that the air is sucked in through the transport duct. Optionally, an air injector can also be provided at a location in the transport channel that is not specified.

However, it has been shown that for the reliable introduction of the sliver into the conveying gap, it is particularly favorable to design the flow generator as a gas injector directly upstream of the mouthpiece channel. This measure also proves to be useful regardless of the design of the outflow opening as a longitudinal gap, so that independent protection is claimed for this.

The gas injector preferably has an annular channel which tapers conically in the direction of flow and surrounds the transport channel and which opens into the mouthpiece channel. This creates a concentrated gas flow that reliably drives the fiber sliver through the mouth of the insertion mouthpiece into the conveying gap.

A particularly high degree of reliability of the device is achieved if a swirl device is assigned to the gas injector. This automatically tapering the beginning of the tape.

The swirl device preferably consists of swirl grooves in the ring channel.

The device according to the invention is particularly suitable for attachment to the end of an outlet elbow of a turntable opening into a can. This results in a clean and space-saving storage of a sliver in the jug, the sliver being treated particularly gently.

• Fig. 1 eine Ansicht einer erfindungsgemäßen Vorrichtung in der Ebene des Förderspalts quer zur Transportrichtung, teilweise im Längsschnitt;
• Fig. 2 eine Ansicht der Vorrichtung in Richtung senkrecht zur Ebene des Förderspalts, ebenfalls quer zur Förderrichtung, im teilweisen Längsschnitt entsprechend der Schnittlinie 11-11 in Fig. 1, in gegenüber Fig. 1 verkleinertem Maßstab;
• Fig. 3 eine Stirnansicht der Vorrichtung nach den Fig. 1 und 2 in richtung auf die Mündung;
• Fig. 4 einen Längsschnitt senkrecht zur Ebene des Förderspalts durch eine gegenüber den Fig. 1 - 3 abgewandelte Ausführungsform einer erfindungsgemäßen Vorrichtung;
• Fig. 5 einen senkrecht zur Ebene des Förderspalts gelegten Vertikalschnitt durch eine weitere Ausführungsform einer erfindungsgemäßen Vorrichtung;
• Fig. 6 eine Ansicht der Vorrichtung nach Fig. 5 mit Blickrichtung auf die Mündung;
• Fig. 7 eine Draufsicht auf die Vorrichtung nach den Fig. 5 und 6, senkrecht zur Ebene des Förderspalts; und
• Fig. 8 eine Ansicht eines Drehtellers mit einer erfindungsgemäßen Vorrichtung, teilweise im Vertikalschnitt.

The invention is explained in more detail below on the basis of exemplary embodiments. Show it:

• Figure 1 is a view of a device according to the invention in the plane of the conveyor gap transverse to the direction of transport, partially in longitudinal section.
• 2 shows a view of the device in the direction perpendicular to the plane of the conveying gap, likewise transversely to the conveying direction, in a partial longitudinal section corresponding to the section line 11-11 in FIG. 1, on a smaller scale than in FIG. 1;
• Fig. 3 is an end view of the device of Figures 1 and 2 towards the mouth.
• 4 shows a longitudinal section perpendicular to the plane of the conveying gap through an embodiment of a device according to the invention modified compared to FIGS. 1-3;
• 5 shows a vertical section through a further embodiment of a device according to the invention, perpendicular to the plane of the conveyor gap;
• 6 shows a view of the device according to FIG. 5 with a view of the mouth;
• 7 shows a plan view of the device according to FIGS. 5 and 6, perpendicular to the plane of the conveying gap; and
• Fig. 8 is a view of a turntable with a device according to the invention, partially in vertical section.

1-3 shows a device which is used to insert a sliver into a conveyor gap 1 and at the same time to compress this sliver. The conveying nip is formed in this embodiment by a pair of press rolls 2, 3. The level of the conveyor gap is indicated by E - E. The press rolls 2, 3 rotate in opposite directions in the directions indicated by arrows.

The device contains a transport channel 4, which tapers conically in the transport direction T and is connected at its inlet end 5 to a conventional transport channel in which a textile sliver is conveyed, for example by means of transport air. The device also has an insertion mouthpiece 6, through which a mouthpiece channel 7 extends, which extends coaxially to the transport channel 4. The mouthpiece channel 7 tapers step by step in the transport direction T, the steps being chamfered or rounded to avoid flow resistance. The transport channel 4, however, is tapered in the transport direction T.

The insertion mouthpiece 6 consists essentially of a cylindrical body 8, the end face facing the rollers 2, 3 above and below the plane E - E of the conveying gap 1 is provided with such grooves 9, 10 that the frontal contour of the insertion mouthpiece 6 adjoins the circle arcuate contour of the rollers 2, 3 on both sides of the plane of the conveying gap 1, as can be seen clearly in FIG. 1. Between the grooves 9, 10 there remains a web 11 with an end face vertical to the direction of transport T (FIG. 3).

A longitudinal gap 12 is cut into the front end of the body 8, which extends in the longitudinal direction of the mouthpiece channel 7 and extends in a plane perpendicular to the plane E-E of the conveying gap 1. In the embodiment according to FIGS. 1-3, in which the conveying gap is delimited on both sides by rolling, the longitudinal gap 12 extends on both sides of the conveying gap plane E-E. Its two sections are identified by 12a and 12b. The longitudinal gap 12 cuts the grooves 9, 10 on the outside and the mouthpiece channel 7 on the inside. It extends counter to the transport direction T so far that its initial section 12c is exposed radially outwards, that is to say not from the contour of a roller or another that delimits the conveyor gap Partly, is covered. This is clearly evident from Fig. 1.

The mouthpiece channel 7 has a circularly closed cross-section up to its transition point 13 into the longitudinal gap 12 and is then opened perpendicular to the conveyor gap plane E-E due to the narrower longitudinal gap 12 compared to its diameter dimensions transverse to the transport direction T and in the plane of the conveyor gap 1. The mouthpiece channel 7 ends, as can be seen clearly from FIG. 1, at 14 at a small distance from the end face 11 of the body 8, so that the actual mouth 15 of the insertion mouthpiece 6 is defined by the walls of the longitudinal gap 12.

The width of the longitudinal gap 12 depends on the weight of the sliver. In millimeters it should be about the same order of magnitude as the weight of the sliver in grams per meter. With a sliver of 5 g / m, for which the device according to FIGS. 1-3 is intended, the width of the longitudinal gap is 12 4 mm.

A gas injector, generally designated 16, is attached to the end of the insertion nozzle 6 facing away from the mouth 15 and has a cylindrical housing 17. In this housing there is a sleeve 19 which forms the conical section of the transport channel 4. The bushing 19 forms an annular gap section 20a with the housing 17 and a conically tapering annular gap section 20b with the body 8 of the insertion mouthpiece 6, which is in flow connection with the section 20a and is sealed off from the outside by a seal 21. The annular gap section 20a starts from an annular space 21 in the housing 17, which is connected via a connection bore 22 to a compressed air source (not shown). The annular gap section 20b opens into the mouthpiece channel 7 at 23. The gas injector 16 is assigned a swirl device 24 which, in the exemplary embodiment shown, consists of swirl grooves 24 'in the annular gap section 20b, as can be seen from the partially cut-away representation of FIG. 2. These swirl grooves can be formed in part 19 or in part 8.

• Im Transportkanal 4 wird in Richtung T ein Faserband mit üblichen Mitteln, beispielsweise mittels Förderluft, transportiert. An der Stelle 23 wird das Faserband von einem mit hoher Geschwindigkeit und mit Drall aus dem Ringspaltabschnitt 20b austretenden Gasstrom erfaßt, verdrillt und durch den Mundstückskanal 7 und die Mündung 15 hindurch in den Förderspalt 1 zwischen den Preßwalzen 2, 3 hineingetrieben. Besonders wichtig ist diese Arbeitsweise am Anfang eines Faserbands. Dieser Anfang wird durch die Verdrillung "zugespitzt", so daß das spitze Anfangsstück im weiteren Verlauf störungsfrei und selbsttätig in den Förderspalt zwischen den Walzen hineingefördert wird.

The device according to FIGS. 1-3 works as follows:

• In the transport channel 4, a sliver is transported in the direction T by conventional means, for example by means of conveying air. At point 23, the sliver is detected by a gas stream emerging from the annular gap section 20b at high speed and with twist, twisted and driven through the mouthpiece channel 7 and the mouth 15 into the conveying gap 1 between the press rolls 2, 3. This way of working is particularly important at the beginning of a sliver. This beginning is "sharpened" by the twisting, so that the pointed starting piece is conveyed into the conveying gap between the rollers automatically and without interference in the further course.

The gas flowing in the mouthpiece channel 7 can escape laterally through the longitudinal gap sections 12a, b, the radially exposed section 12c ensuring unobstructed outflow. The sliver is first compressed radially in the conical section of the transport channel and then by the step-like tapering of the mouthpiece channel. From point 13 onwards, however, it can extend into the longitudinal gap sections 12a, b perpendicularly to the plane E-e of the conveying gap, so that thickenings do not lead to the formation of jams and to tearing of the fiber sliver. In the last section before the mouth 15, the sliver is compressed by the walls of the longitudinal gap 12 in the plane of the conveyor gap 1, but can still extend perpendicularly to the gap. Immediately after leaving the mouth 15, the fiber sliver is then gripped by the press rolls which cling to the insertion mouthpiece 6 on both sides of the conveying nip plane and is now compressed in the direction perpendicular to the plane of the conveying nip. At this point, there is no longer any risk of jamming, because the surfaces of the press rolls that continue to attack the fiber sliver. The fiber sliver is first compressed radially from all sides, then only essentially in the plane of the conveyor gap and finally perpendicular to this plane. Since there is nowhere to fear jamming or tearing off, the sliver is reliably and trouble-free fed to the roller pair 2, 3 under compression.

The functional parts of the exemplary embodiment according to FIG. 4 correspond to those according to FIGS. 1-3. Functionally identical parts are therefore identified by the same reference symbols and are not described again.

The device according to FIG. 4 is mounted on a stationary support wall 25. The gas injector 16 is attached to the body 8 of the insertion mouthpiece on the front side with a flange part 16a. Instead of the sleeve 19 of FIGS. 1-3, the gas injector is provided with a sleeve 19 'which is formed in one piece with it and which, between itself and the mouthpiece body 8, leaves an annular space 21' for the compressed gas, which in this case is supported by the supporting wall 25 and the body 8 is fed through the setting line 26 and a radial line section 27. The annular gap section 20'b extends directly from the annular space 21 '.

The device according to FIG. 3 functions exactly like that according to FIGS. 1-3.

5-7, the conveying gap 1 "is formed between a press roll 2" rotating in the direction of the arrow and a fixed counter body 8 "a which is formed in one piece with the body 8" of the insertion mouthpiece 6 ". The body 8" again contains the mouthpiece channel 7 ". A longitudinal gap 12" a is only provided on that side of the plane E-E of the conveying gap 1 "on which the press roll 2" also lies. A conical recess 28 is machined into the end of the body 8 "facing away from the conveying gap 1", into which a gas injector is inserted analogously to the embodiments according to FIGS. 1-3 and 4.

6 and 7, the press roll 2 "is omitted. It can be seen that the counter body 8" a forms a trough 29, which is adapted in the contour to the circular contour of the press roll 2 ".

The operation of this device is again analogous to that of the device described above.

A further injector for introducing the transport gas for the conveyor belt can be assigned upstream of the device described. Furthermore, in the transport path of the band material, preferably (viewed in the transport direction) after the transition between the closed mouthpiece channel and the region of this channel cut by the longitudinal gap, a e.g. capacitive, monitoring element can be arranged. In addition, the boundary surface of the outflow path formed by the longitudinal gap can merge into the outer surface of the mouthpiece without edges, as a result of which better gas separation is achieved.

When inserting or threading the beginning of the belt, the gas injector 16 takes action for as short a time as possible and thus generates an instantaneous overpressure by means of which the beginning of the textile belt material is shot into the conveying gap. With the device according to the invention, ends of any shape - blunt, torn off, open - can be introduced into a conveying gap.

In order to achieve an additional compression of the band material in front of the conveyor gap, the walls of the insertion mouthpiece can be designed to be movable at their outlet-side area, so that after the beginning of the textile band material has been introduced into the conveyor gap, the distance between the walls can be reduced.

8 shows an application example of the invention, which is explained in more detail below. It is the turntable 30 of a spin can 31 shown in the illustration. The turntable 30 comprises an outlet elbow 33 rotatably arranged on the top of the cover 32, on the lower end of which, facing the spin can 31, a device according to the invention is arranged, as shown in FIGS 3 has been described. It can be clearly seen that the gas injector 16 is connected to the lower end of the outlet elbow 33. The mouthpiece 6 with the longitudinal slot 12 is arranged below the gas injector 16. Below the mouthpiece 6 are the two press rolls 2 and 3, which form the conveyor gap.

The compressed air is supplied to the gas injector 16 from a compressed air source 36 via a compressed air line 34 which is passed through the swivel joint 35. While the part of the line 34 arranged between the compressed air source 36 and the swivel joint 35 is arranged stationary with respect to the cover 32, the part of the line 34 located between the swivel joint 35 and the gas injector 16 also rotates with the outlet elbow.

In the left half of Fig. 8, the outlet manifold 33 is shown in a solid line. In the middle of FIG. 8, in which the outlet elbow is shown in dashed lines, it has already rotated 90 _° about the swivel joint 35 in relation to the position in the left half of the figure. During this rotation, the sliver is simultaneously conveyed through the outlet elbow 33 and via the gas injector 16 through the press rolls 2 and 3 and is thus deposited in the spinning can 31.

Claims (13)

1. Apparatus for the compression and automatic insertion of a textile sliver into a conveying nip (1 or 1"), in particular a roll nip, having a transport channel (4), a flow generator (16) for the development of a gas stream in the transport channel, and an insertion mouthpiece (6 or 6"), which adjoins the the transport channel and has a mouthpiece channel (7 or 7"), aligned with the transport channel and tapering in flow direction, as well as at least one lateral slit-like opening in the mouth region for the flowing-away of the gas stream out of the mouthpiece channel, characterized in that the opening is designed as a longitudinal gap (12,12a, b; or 12"a), extending from the mouth (15) of the mouthpiece channel (7 or 7") in the longitudinal direction of the latter in a plane essentially perpendicular to the plane (E-E) of the conveying nip (1 or ₁"), and in that the mouth-side contour (9 or 9", 10) of the insertion mouthpiece (6 or 6") on both sides of the longitudinal gap (12, 12a, b or 12"a) is matched to the contour of the components (2, 3 or 2", 8"a), in particular rolls (2, 3), forming the conveying gap (1 or ₁").

2. Apparatus according to Claim 1, characterized in that, when the conveying gap (1) is formed by a pair of rolls (2, 3), on either side of the plane (E-E) of the conveying cap (1), a longitudinal gap (12a, b) is provided.

3. Apparatus according to Claim 1, characterized in that, when the conveying gap (1") is formed by a roll (2") and a fixed counter element (8"a), the longitudinal gap (12"a) is provided on the roll side in the insertion mouthpiece (6").

4. Apparatus according to one of Claims 1 to 3, characterized in that the mouthpiece channel (7) having a circular cross-section ends a small distance in front of the mouth (15) and is connected to the latter alone by the longitudinal gap (12) forming the mouth, the width of the longitudinal gap being less than the diameter of the final section of the mouthpiece channel (7).

5. Apparatus according to one of Claims 1 to 4, characterized in that the longitudinal gap (12 or 12"a) has, seen in the direction of transport (T), a radially freely opening-out initial section (12c or 12"c).

6. Apparatus according to one of Claims 1 to 5, characterized in that the width of the longitudinal gap (12 or 12"a) is about 3-5 mm, in particular 4 mm, in the case of a sliver of 5 g/m.

7. Apparatus according to one of Claims 1 to 6, characterized in that the mouthpiece channel (7 or 7") tapers in stages in the direction of the mouth (15).

8. Apparatus according to one of Claims 1 to 7, characterized in that the transport channel (4) tapers conically in the direction of the mouthpiece channel (7).

9. Apparatus, in particular according to one of Claims 1 to 8, characterized in that the flow generator is a gas injector (16) connected directly upstream of the mouthpiece channel (7).

10. Apparatus according to Claim 9, characterized in that the gas injector (16) has an annular channel (20a, b) which tapers conically in the direction of flow, surrounds the transport channel (4) and opens out into the mouthpiece channel (7).

11. Apparatus according to one of Claims 9 and 10, characterized in that the gas injector (20) is assigned a swirl device (24).

12. Apparatus according to Claim 11, characterized in that the swirl device (24) consists of swirl grooves (24') in the annular channel (20a, b).

13. Use of the apparatus according to one of the preceding claims, characterized in that the apparatus is fitted at the end of a discharge elbow (33) of a turntable (30), which elbow opens out into a can (31).

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