EP0482475A1 - Lap detacher - Google Patents

Abstract

The invention relates to a process and an apparatus for detaching a lap start (9) from a lap roll (4). To follow up with a new lap roll (4), it is known to detach the new lap start (9) of the new lap roll (49) from the roll automatically by suction or blowing off. The set object of the invention is to improve the processes and apparatuses known hitherto. It is proposed, in order to detach the lap start (9), to generate over at least the lap width (B) and at a distance from the periphery (P) of the lap roll (4) an airstream (S) which leads to the lap roll approximately tangentially and in the unrolling direction (A). In the apparatus proposed for this, a tubular nozzle (10) having an air discharge slit (16) directed to the lap roll (4) approximately tangentially and in the unrolling direction (A) is arranged over at least the lap width (B) and at a distance from the periphery (P) of the lap roll. <IMAGE>

Description

The invention relates to a method for releasing a cotton wool beginning from a cotton wadding, or to an apparatus for carrying out the method.

When tracking or starting a new wadding roll on a combing machine or on a wadding sweeping section, the new wadding is loosened by hand after placing a new wrap on a holder to unroll the wadding and manually applied to the end of the wadding.

From DE-AS-1283718, however, a device can be found, a new reserve winding being kept ready and the new wadding beginning being automatically updated.

Two solutions are proposed to replace the new wadding. In the first solution, the new wadding start is removed by means of a sieve drum that is under vacuum inside and placed downwards in the nip of two conveyor rollers for attachment to the running wadding end.

In the second solution, the new wadding is blown off by means of a nozzle which acts counter to the unwinding direction of the roll and is placed on the wadding end which is running out. The blowing process, or the loosening of the new wadding end, is monitored by a sensor.

The solution with the sieve drum is relatively complex and expensive and carries the risk of contamination of the sieve drum during continuous operation due to fiber fly and other components. The delivery of the new cotton wadding detached from the sieve drum to the subsequent conveyor rollers can lead to problems, especially since the new cotton wadding hangs freely down on part of the delivery path to the conveyor rollers and is not guided. As a result, the tips of the new wadding start can fold over and there can be mass accumulations in the area of the attachment point with the wiping end of the wadding. This turning over of the tips of the new wadding can occur when uncontrolled air flows occur in the area of the dispensing.

When blowing off the beginning of the wadding, an unwanted flipping of the tips can also occur. In addition, it is difficult to achieve a desired coverage when starting with this device.

From JP-A-1-292121 a device for removing the wadding is known, the wadding beginning being sucked off by means of a suction tube which can be fed to the winding and brought into overlap with an outgoing wadding end. This system normally ensures a safe removal of the new wadding from the wrap. However, as soon as the front edge of the new wadding start lies transversely to the longitudinal axis of the suction tube on the roll, it can happen that only a part of the wadding start is seen across the width of the roll and is pulled off.

It is therefore an object of the invention to improve the known methods and the devices for detaching a new wadding start of a wadding roll to ensure simple and safe detachment of the wadding beginning from the wrap using a simple and safe detaching device. At the same time, the device or the method is intended to ensure a safe transfer to a subsequent attachment point to the leaking cotton wool.

This object is achieved in that an air flow leading approximately tangentially and in the unwinding direction to the wadding roll is generated over at least the wadding width and at a distance from the periphery of the wadding roll.

The subsequent guidance after detachment in a predetermined position ensures the safe transfer to the subsequent attachment point.

The formation of the air flow in the form of air flowing in a flat surface creates a constant negative pressure area across the entire width of the roll, since the air jet generated mixes with the environment and entrains considerable amounts of air in the direction of the jet (see also paperback DUBBEL - "Properties of the free jet "), which creates an air flow along the wrap, which guarantees a safe detachment of the entire new wadding.

The detachment can take place by rotating the wadding roll, the wadding beginning at the wadding reaching the area of the air flow or by correspondingly stationary feeding of the wadding roll, whereby the wadding beginning at the winding is positioned in the area of the air flow.

The further proposed possibility of changing the air speed ensures an optimal setting according to the respective work step. To carry out the method, it is proposed that a nozzle with one or more air outlet openings oriented approximately tangentially and in the unwinding direction to the wadding wrap be arranged over at least the wadding width and at a distance from the periphery of the wadding wrap. Here, the expression tangential is not to be understood in a restrictive manner, precisely to the tangent to the outer circumference of the winding, but rather in an angular range which includes the tangent and is at least not directed against the unwinding direction.

The outlet openings for the air jet from the nozzle can be designed both as a continuous slot projecting beyond the width of the wadding or as bores which are spaced apart from one another. The further proposed guide surface in the extension of the air outlet openings of the nozzle ensures a safe transfer to the subsequent attachment point.

The further proposed geometric arrangement of the air outlet openings in relation to the periphery of the wadding roll and the nozzle in the detaching position ensures that, due to the prevailing air currents and the resulting vacuum areas, the wadding start is safely released from the roll after passing through the nozzle.

The movable attachment of the nozzle enables a simple and safe transfer of the removed wadding beginning to a subsequent attachment point to an outgoing wadding end.

For better coordination of the removal or attachment process of the new wadding beginning, it is further proposed that the air speed of the air jet generated by the nozzle is designed to be changeable during the removal or attachment process. Advantageously, it is proposed to apply a high air speed and, after the removal process has taken place, a lower air speed of the air jet via the nozzle. The attachment of side guides to the guide surface restricts the lateral spread of the air jet and ensures that the removed wadding begins to retain its width and does not break out laterally.

Further advantages of the invention are described and shown in more detail with reference to the following exemplary embodiment.

• Fig. 1 eine schematische Seitenansicht einer Abroll- und Abnahmevorrichtung für einen Wickel einer Kämmaschine
• Fig. 2 eine vergrösserte Seitenansicht der Abnahmevorrichtung für das Wattenende nach Fig. 1
• Fig. 3 eine verkleinerte Teilansicht nach Fig. 1 - Aufbereiten des Wattenendes
• Fig. 4 eine verkleinerte Teilansicht nach Fig. 1 - Anlegen des aufbereiteten Wattenendes
• Fig. 5 eine verkleinerte Teilansicht nach Fig. 1 - Ablösen des angelegten und aufbereiteten Wattenendes
• Fig. 6 eine verkleinerte Teilansicht nach Fig. 1 - Ansetzen des neuen Wattenendes an das auslaufende Wattenende
• Fig. 7 eine verkleinerte Teilansicht nach Fig. 1 - Abrollen des neu angesetzten Wikkels zum Auskämmen
• Fig. 8 eine perspektivische Ansicht nach Fig. 1.
• Fig. 9 eine weitere Ausführungsform der Düse entsprechend der Fig. 2

Show it:

• Fig. 1 is a schematic side view of an unwinding and removal device for a winding of a combing machine
• FIG. 2 shows an enlarged side view of the removal device for the cotton end according to FIG. 1
• Fig. 3 is a reduced partial view of FIG. 1 - preparation of the wadding end
• Fig. 4 is a reduced partial view of FIG. 1 - putting on the prepared cotton end
• Fig. 5 is a reduced partial view of FIG. 1 - detaching the applied and prepared cotton end
• Fig. 6 is a reduced partial view of FIG. 1 - attaching the new wadding end to the emerging wadding end
• FIG. 7 is a reduced partial view according to FIG. 1 - unrolling of the newly attached winding for combing out
• 8 is a perspective view of FIG .. 1
• 9 shows a further embodiment of the nozzle corresponding to FIG. 2

Fig. 1 shows a winding holder 1, which is provided with a front winding roller 2 and a rear winding roller 3 for receiving the wadding roll 4. The wadding roll 4 consists of a wadding 5, which was wound onto a sleeve 6 in a special process. As indicated schematically, the winding rollers 2, 3 are coupled to a drive 7. In the area of the front winding roller 2 there is a detaching device 8 for detaching the wadding beginning 9. The detaching device 8 consists of a tubular nozzle 10 which extends at least over the width of the roll 4 and which has pivot arms 11, 12 attached about both ends about the axis of rotation 13 of the front Winding roller 2 is pivotally arranged. The nozzle 10 has an air outlet slot 16 which, in the solid position of the detaching device shown in FIG. 1, points in the tangential direction and in the unwinding direction A of the roll 4. The air outlet slot 16 also extends continuously over the width of the winding 4. Instead of the slot 16, a large number of bores made next to one another could also be present.

Below the air outlet slot 16, a guide plate 17 is attached to the nozzle 10, which also extends over the width of the cotton swab 4. The guide plate 17 is provided with lateral guides 53 on its narrow sides for lateral guidance of the wadding beginning 9 or the air flow S. Within the tubular nozzle 10, a distributor pipe 18 is attached with outlet openings 19 provided on its circumference. This can be seen in particular from FIG. 2. The distributor pipe 18 serves to supply compressed air and is closed at one end and connected to a compressed air line 20 at the other end. The compressed air line 20 is attached flexibly so that it can also be moved when the detaching device 8 is pivoted. A uniform pressure distribution in the area of the outlet slot 16 is ensured by the supply of the compressed air via the openings 19 provided on the circumference of the distributor pipe 18.

As can be seen from FIG. 2, the two swivel arms 11, 12 of the nozzle 10 are connected via a plate 14, which at the same time forms a guide surface for the rolling cotton wool.

The nozzle 10 is closed on its lateral end faces, so that the compressed air supplied via the compressed air line 20 can only emerge at the air outlet slot 16.

The pivoting movement of the detachment device into the dash-dotted lower layer shown in FIG. 1 is carried out by a cylinder 22 articulated on a schematically indicated frame 21. The winding rollers 2, 3 and the other elements listed are also mounted on this frame 21. In the position shown in FIG. 1, the start of winding 9 is already in a detachment position and is released to an attachment point 23 by pivoting the detachment device 8 into the lower position shown in broken lines.

The attachment point 23 consists of a lower roller 24 and an upwardly displaceable pressure roller 25. As can be seen from FIG. 1, between the roller 24 and the pressure roller 25 there is a wadding end 26 of the outgoing wadding 27 which protrudes backwards and downwards a combing device 28 is supplied. The cotton wool 27 is guided over a guide plate 31 and fed to a pair of tongs 33 via a feed cylinder 32. Arranged below the pliers 33 is a rotating circular comb 34 which combs out the fiber beard which projects in the clamped position of the pliers in a known manner. The combed-out fiber beard is pulled out of the cotton wool 27 by means of subsequent tear-off cylinders 35 and passes through a correspondingly supplied fixed comb 36 during the tear-off process.

The lower roller 24 of the attachment point, the feed cylinder 32, the circular comb 34 and the tear-off cylinder 35 are connected to a schematically indicated drive 37. The drive unit 37 is also responsible for the movement of the pliers unit 33. For reasons of clarity, however, the illustration has been omitted.

For exact control of the time of detachment of the wadding beginning 9, the control 29 of the compressed air source 30 for supplying the nozzle 10 with compressed air to generate the air flow S, the control of the drive 7 of the winding rollers 2, 3 and the control of the compressed air source 47 of the cylinder 22 for the pivoting of the nozzle 10 is connected to one another in a central control unit 52.

Instead of the combing device 28 shown, a sweeping device for the cotton wool could also be arranged in a cotton wool sweeping section when using this attachment device.

Between the two winding rollers 2, 3 and below the wadding roll 4, a preparation device 40 for the wadding end 9 is pivotably attached to the frame 21 via swivel arms 38, 39. The preparation device 40 here consists of a suction channel 41 and a clamping part 42 which is pivotally attached to the entrance of the suction channel. The clamping part 42 can be pivoted about a flexible sleeve 44 via a cylinder 43. In the clamping position, the clamping part 42 rests on the opposite wall part 45 of the suction channel 41. A sensor 48 for detecting the start of the wadding is located below the clamping point. The suction channel 41, which is otherwise closed on all sides except for the suction opening 49, has an opening on one of its end faces, to which a suction pipe 50 is flexibly connected.

3 to 7 with reference to FIGS. 1 and 2, the detaching process of the cotton wool beginning 9 and the feed to a connection point 23 are described in more detail below: FIG. 3 shows a position, with a new cotton wool roll 4 already opening the winding rollers 2,3 is located. This wadding roll 4 was manually or automatically placed on the winding rollers 2, 3 after the empty sleeve of the leaking wadding 27 was removed or removed manually via an ejection device (not shown). Such an ejection device could e.g. be designed according to the design according to JP-AS 63-27449. The running out of the old roll is monitored by a sensor 51, which then responds as soon as the contrast changes from the white running out cotton wool to the black surface of the sleeve 6. After the sensor 51 has signaled that the old cotton wadding has run out, a device (not shown in any more detail here) is put into operation, which prepares the running cotton end 26 for a subsequent attachment process with a new wadding start. This means that a part of the tapering cotton end 26 is removed or torn off via the device (not shown) in order to obtain a uniform tear-off edge of the tapering cotton end 26, as seen across the width of the cotton tread 27. Such a device can be found in the earlier British patent application with the application number 9009939.1 from May 2, 1990 of Maschinenfabrik Rieter AG.

After the sleeve of the old lap has been ejected and the lap end 26 of the emerging lap 27 has been prepared, the lap 27 is transferred to the position shown in FIG. 3, the lap end 26 being clamped over the attachment point 23 and in the direction of the new lap lap 4 given piece protrudes. 3 is controlled by sensors (not shown) and has already been addressed in the earlier British patent application cited. The further transport of the leaking cotton wool 27 to the subsequent processing unit is now interrupted, ie the cotton end 26 protruding rearward from the attachment point 23 assumes a waiting position for the application of a new cotton wool start 9. The new wadding roll 4 already put on in FIG. 3 is rotated clockwise by the driven winding rolls 2, 3, whereby the as yet unprepared start of the wrap reaches the area of the preparation device 40 or the suction channel 41.

The negative pressure generated during the rotational movement of the winding 4 in the suction channel 41 has the effect that the beginning of the winding of the new winding 4 is drawn into the channel 41 when it reaches the area of the suction opening 49. A sensor 48 installed in the suction channel 41 detects the pulling in of the start of the winding into the suction channel 41. As soon as the sensor 48 triggers the signal "cotton wool present", the clamping part 42 is actuated via the cylinder 43 and clamps the unprepared cotton wool beginning of the cotton roll 4 to it Wall part 45 of the suction channel 41 fixed.

Now, as shown in FIG. 4, the drive of the winding rollers 2, 3 is reversed, as a result of which the winding 4 rotates counterclockwise. The winding 4 is now rotated through a predetermined angle of rotation, as a result of which the new wadding beginning held by the clamping part 42 is separated and a new and prepared wadding beginning 9 is thereby formed. The rotational movement of the winding 4 counterclockwise is at least so far that the new wadding beginning 9 is pressed against the outer periphery P of the winding 4 via the winding roller 3, so that this does not move automatically from the winding 4 when the direction of rotation is reversed on the way to the front winding roller 2 solves. As can also be seen from FIG. 4, the suction channel 41 can be pivoted into a lower position shown in dash-dotted lines in order to tear off the unprepared cotton end.

With a corresponding geometric attachment of the suction channel 41 to the winding roller 3, the pivoting of the channel 41 for tearing off could be dispensed with, i.e. the opposite rotational movement of the winding 4 can be sufficient to tear it off.

After this tear-off process, the torn end of the wadding is sucked off via the suction pipe 50 after opening of the clamping part 42 and, after the suction device has stopped, the direction of rotation of the roll 4 or the drive of the winding rollers 2, 3 is reversed again.

Based on the predetermined angle of rotation of the roll 4 during the tear-off process for preparing the new wadding beginning 9, its position on the circumference of the roll 4 is precisely defined. This means that the system knows when the new wadding 9 comes into the area of the detaching device 8.

As can be seen from FIG. 5, the winding 4 rotates clockwise again, as a result of which the newly prepared cotton wool beginning 9 reaches the area of the detaching device 8. As soon as the beginning of the cotton wool 9 has passed the point of contact of the front winding roller 2, the nozzle 10 of the detaching device 8 is pivoted from a lower position shown in broken lines to an upper position via a cylinder 2. After reaching this upper position, the nozzle 10 is supplied with compressed air from the compressed air source 30 via the compressed air line 20 and via the distributor pipe 18 and its outlet openings 19. This compressed air now emerges at the air outlet slot 16 and generates an air flow S along the guide plate 17. The air pressure in the distributor pipe 18 is of the order of 6 bar.

The compressed air is then switched on when the front end of the wadding 9 has passed the air outlet slot 16 of the tubular nozzle 10 with the detaching device 8 pivoted up and is at a certain distance from the latter. This process is precisely controlled by the control unit 52. The exact point in time of the compressed air supply is decisive for the gentle removal of the cotton wool start 9.If the compressed air supply is too early, i.e. if e.g. the front edge of the wadding beginning 9 is at the height of the outlet opening 16, the previously prepared wadding beginning can be changed negatively by the air currents which arise, the tips of which can also fold backwards. If the compressed air supply is too late, there is a risk that the wadding start 9 will no longer be detached from the winding 4.

The air flow S applied along the guide plate 17 creates a vacuum space U and, due to the entrained ambient air between the periphery P of the roll and the guide plate 17, an air flow along the roll 4 (counter to its unwinding direction), whereby the wadding 9 detaches from the winding 4 and based on the existing pressure conditions due to the air flow S on the guide plate 17. Between the guide surface of the guide plate 17 and the cotton wool, an interface layer of not precisely defined air speed is formed due to the friction between the air jet and the guide surface. The cotton "floats" on this boundary layer so that there is practically no friction between the cotton and the guide surface.

As soon as the wadding 9 is detached from the roll 4 and rests on the guide surface 17, the nozzle 10 is moved by means of the swivel arms 11, 12 of the cylinder 22 is pivoted downwards. During this pivoting movement, the pressure roller 25 of the attachment point 23 is lifted off the lower roller 24.

As the winding 4 continues to rotate, the front edge of the wadding beginning 9 is displaced along the guide plate 17 up to the end thereof. The immediate pivoting of the nozzle 10 after loosening the wadding beginning 9 is therefore important in order to prevent the front edge of the wadding beginning 9 from erecting due to the turbulence arising between the end region of the guide surface 17 and the periphery P of the winding 4 and possibly to the rear flipped.

As can be seen from FIG. 6, the wadding end 9 is transferred between the nip point of the roller 24 and the raised printing roller 25 and at the same time is placed on the wiping end 26 of the wadding.

In order not to disrupt this attachment process, after the wadding end 9 has been detached from the wrap 4, the amount of pressure of the applied compressed air can be reduced. As soon as the cotton end 9 has reached the position shown in FIG. 6, the pressure roller 25 is lowered again, whereby the new cotton end 9 connects to the outgoing cotton end 26.

After the pressure roller 25 has been lowered, as shown in Fig. 7, the subsequent cotton processing device, e.g. Combing device 28, including the cotton feed device 32, is restarted and the supply of compressed air in the nozzle 10 is interrupted.

The cotton is now continuously fed back to the subsequent cotton processing device via the guide plate 31.

FIG. 8 shows a perspective illustration of FIG. 1, with the illustration of all the parts shown in FIG. 1 being omitted for reasons of clarity. The suction device 50 or the compressed air line 20 could also be attached on both sides. Correspondingly, the cylinders 22 and 46 could also be mounted on the opposite swivel arms 12 and 39, respectively. 8 shows in particular that the detaching device 8 or the nozzle 10 extends over the entire width B of the roll 4.

FIG. 9 shows a further variant of the nozzle 10 corresponding to the representation according to FIG. 2. The nozzle is designed as a square tube and the air outlet slot 16 is located between the guide plate 17 and a guide rod 54 with a corresponding cross section, which is fixed on the guide plate 17 is attached. The guide plate 17 and the nozzle 10 are provided with slots 55 which together form a passage to the air outlet slot 16 for supplying the compressed air. The mode of operation corresponds to that already listed under FIG. 2.

With this proposed device for removing a wadding end of a new lap, it is possible to ensure automatic and functionally reliable tracking of a new wadding lap in continuous operation.

Claims (16)

1. A method for releasing a wadding beginning (9) from a wadding wrap (4), characterized in that
An air flow (S) leading approximately tangentially and in the unwinding direction to the wadding roll (4) is generated over at least the wadding width (B) and at a distance from the periphery (P) of the wadding roll (4). 2. The method according to claim 1, characterized in that
the detached cotton wool start (9) is guided in a predetermined position and transferred to a subsequent holder (23). 3. The method according to claim 1 or 2, characterized in that
the air flow (S) is formed from air flowing in a flat surface. 4. The method according to any one of claims 1 to 3, characterized in that
the air speed of the air flow (S) is changeable. 5. The method according to claim 5, characterized in that
the air velocity of the air flow (S) is reduced after loosening the wadding beginning (9). 6. Device for releasing a wadding beginning (9) from a wadding wrap (4), characterized in that
A nozzle (10) with one or more air outlet openings (16) directed approximately tangentially and in the unwinding direction (A) to the cotton roll (4) is arranged over at least the cotton width (B) and at a distance from the periphery (P) of the cotton roll. 7. The device according to claim 6, characterized in that
the outlet opening is designed as an air outlet slot (16) projecting over at least the wadding width (B). 8. The device according to claim 6, characterized in that
the air outlet openings are arranged as bores in the nozzle which are at a short distance from one another over at least the wadding width (B). 9. Device according to one of claims 6 to 8, characterized in that
the nozzle (10) is provided with a guide surface (17) in the extension of the air outlet openings (16). 10. The device according to claim 9, characterized in that
the guide surface (17) is attached to the nozzle (10) approximately parallel to the air flow (S) emerging from the air outlet openings (16) such that the air flow (S) is between the periphery (P) of the wadding roll (4) and the guide surface (17). 11. The device according to one of claims 6 to 10, characterized in that
based on the periphery (P) of the wadding winder (4) in the detaching position (Fig. 9), the distance (X) of the air outlet openings (16) is greater than the smallest distance (Y) of the nozzle (10). 12. Device according to one of claims 6 to 11, characterized in that
the nozzle (10) is movably attached. 13. The apparatus according to claim 12, characterized in that
the nozzle (10) is pivotally attached via swivel arms (11, 12). 14. The apparatus according to claim 13, characterized in that
the wadding roll (4) is carried over two winding rolls (2, 3) and the swivel arms (11, 12) of the nozzle (10) are mounted on the axis (13) of the front winding roll (2). 15. The device according to one of claims 9 to 14, characterized in that
the guide surface (17) is provided in the region of its narrow sides with lateral guides (53) pointing towards the periphery (P) of the cotton roll (4). 16. The device according to one of claims 1 to 15, characterized in that
at least the control (29) of a compressed air source (30) for generating the air flow (S), the drive (7) of the winding rolls (2, 3) which set the cotton roll (4) in motion for unwinding, and an adjusting device (22) for pivoting the nozzle (10) are connected to one another in terms of control.

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