EP0299180B1 - Unwinding device for paper or cardboard web - Google Patents

Abstract

A discontinuously operated unwinding device has a splicing device with a cross-member which can be moved transversely with respect to the web unwound from a winding roll and towards said web. A cutting device which can be placed against the cross-member from the other side of the web is used to cut through the web by lifting the empty roll, which is mounted in an unrolling device, out of its unwinding position. A new parent roll, the beginning of whose web is provided with an adhesive coating, is conveyed to the location of the empty roll by means of a transport device and the beginning of the web is positioned relative to the splicing device. The splicing device, which holds the separated web end against the cross-member, can be moved radially with respect to the axis of the new parent roll and against the latter, where the end of the web is brought into contact with the beginning of the web and is spliced by means of the adhesive coating. The length of web which is required for guiding the end of the web towards the new roll is provided using a compensating roller. <IMAGE>

Description

The invention relates to a support roller roller, backup roller roller and the like. assigned unwinding device for paper or cardboard web or the like, according to the preamble of claim 1.

Such an unwinding device is known from US Pat. No. 3,327,959. There, a winding roll (empty roll) which is about to run out is replaced by a new full roll (parent roll) while the web is being pulled off the winding roll, albeit at a reduced speed. The empty roll is lifted out of the unwinding position and the new parent roll is conveyed from its waiting position into the unwinding position. The web, which is still unwound from the roll in the new position, is guided around a crossbar designed as a guide roll, which extends close to the circumference of the new parent roll in the unwinding position. The new start of the web on the mother roll is provided with an adhesive to connect the start of the web with the outgoing web of the empty roll. For this purpose, the peripheral speed of the parent roll must be matched to the speed of the unwound web. Shortly before the web supply on the empty roll is completely unwound, the guide roller is pivoted against the circumference of the new, rotating mother roll in order to bring the end of the unwound web into contact with the adhesive point on the mother roll. After gluing, a separating device cuts through the running web, which takes the beginning of the web on the new parent roll. The empty roll is now lifted out of its position and stored in a memory from which it can be removed with a hoist.

In order to be able to carry out such a change of the empty roll against a new mother roll, the known unwinding device is designed to be relatively complex: guideways and drive means must be provided in order to convey the empty roll from the unwinding position. The new mother roll subsequently brought into the unwinding position is to be synchronized with a drive to the speed of the unwound web. In addition, a complex machine control system must be provided to carry out the splicing process. Nevertheless, in the known device during the splicing process, uncontrolled lengths of web duplication occur, which can lead to faults in the subsequent processing of the web.

In winding machines in which e.g. After a longitudinal section of the unwound web, it is wound up on support rollers or back-up rollers to form relatively large rolls, when these rolls are finished, the machine must be stopped so that the rolls can be removed from the machine. The completion of the rolls is such that an empty roll can be exchanged for a new mother roll in such a standstill. However, this considerably reduces the time advantage achieved in the aforementioned known unwinding device when changing the empty roll against a parent roll.

DE-OS 34 40 107 discloses a winding machine with an unwinding device in which, at the end of the unwinding process, a certain length of web is stored in a web length memory when the machine is at a standstill and the web is then severed. The stored web length is then wound onto a suction roll arranged parallel to the roll axis. Now the empty roll is let down from the unwinding device with a transport device and, after being transported away, a new parent roll is lifted into the unwinding position. The suction roll is now pressed against the circumference of the new parent roll the web end section located on the suction roll is unwound with simultaneous slow rotation of the roll. The end of the web meets an adhesive application on the circumference of the new parent roll, so that the end of the web is connected to the new beginning of the web, with inadmissibly long duplications of the web in the connection area being avoided by appropriate control of the suction roll and the winding roller drive. This control complicates the unwinding device, since mother rolls with different diameters have to be processed. In addition, drive means are required to wind the severed web end section onto the suction roll. Rewinding and unwinding the web section delays the process of changing an empty roll for a new parent roll, as well as the sequential separation of the web and depositing the empty roll from the unwinding device. Furthermore, the transport of the rolls in the vertical direction is disadvantageous since a new winding roll can only be fed to the unrolling device after the empty roll has been released from the transport device.

In addition, from US Pat. No. 4,173,314 a unwinding device provided for "flying roll change" is known, in which a drive device drives a mother roll provided with adhesive on the circumference and an outfeed winding roll at the same circumferential speed. A dancer roller immersed in the drawn web is used to control the drive device. In addition, a splicing device is provided which has no contact with the web in its rest position. When the winding roll empties, a mark arranged on the end face of the parent roll and in relation to the adhesive application triggers a pivoting movement of the splicing device, so that the web is cut and the end of the web formed is simultaneously attached to the parent roll.

In contrast, US Pat. No. 4,575,016 shows an unwinding device in which the splicing process takes place when the new winding reel is stationary. Before this, however, the web is introduced into a web length store of considerable length so that the web can be drawn off from the store during the splicing process and does not have to be interrupted. The web unwound from the almost empty winding roll is clamped to a splicing device, cut through and brought into a position in which the web end formed is provided with an adhesive application. The empty roll is then removed and a new winding roll in a defined position is inserted in its place. The splicer now presses the end of the web against the start of the web on the circumference of the new winding roll. After the webs have been connected, the clamping is released and the splicing device is guided away from the winding roll.

The invention has for its object to simplify an unwinder of the type mentioned in order to achieve a roll change process that can be carried out in a short time in discontinuous operation.

This object is achieved by the features characterized in claim 1.

The solution offers the following advantages:
The unwinding device according to the invention allows a very significant step in the direction of full automation and a drastic reduction in dead times. The three functions are carried out with just a few elements: holding the web, separating and gluing.

When the web is held securely, the unwound web is separated from the empty roll by clamping between the crossbar of the splicing device and the separating device. The already necessary conveying process of the empty roll from the unwinding position is used for separation.
Since the position of the new start of the web on the mother roll and the end of the web on the crossbeam of the splicing device are determined, a reliable meeting of both web sections is achieved when the end of the web is brought to the start of the web. This avoids duplication of the track following the connection point.
In the device according to the invention, if a double unrolling and a necessary synchronization device for two roller drives is omitted, a splicing process that can be carried out in a short time can still be carried out, since - as mentioned - the end of the web is formed when the empty roll is removed and immediately attached to the new mother roll can.

Advantageous embodiments of the invention are characterized in the subclaims.

The measure specified in patent claim 2 and in patent claim 3 achieves a secure hold of the web end on the splicing device with little effort.

The embodiment characterized in claim 4 serves to secure the relative position of the web end for the splicing process.

With the measure specified in claim 5, on the one hand, when the traverse moves against the web, an intensive wrapping of the traverse and, on the other hand, during the radial movement process, a secure impact of the web end on the web start is achieved even with different parent roll diameters.

An expedient further development of the subject matter of claim 4, which can be implemented with little constructive effort, is characterized in claim 6.

The measure specified in claim 7 discloses a functionally reliable separating device with a low-wear separating element.

With the development of the separating device characterized in claim 8, the web is held securely during the separating process.

The embodiment of the invention disclosed in claim 9 has the advantage that the web between the splicing device and the separating device can be reliably detected and subjected to the subsequent handling. As a result, influences originating from the top or bottom of the empty roll can be largely eliminated because of the web take-off. The separating device can be arranged depending on the position of the lifting device for the empty roll and its path of movement from the unwinding position into the memory on the corresponding web side such that when the web is lifted by lifting the empty roll, its separation on the perforation comb is reliably achieved.

With the measure specified in claim 10, the positioning of the adhesive point on the mother roll is ensured so that the beginning and end of the web meet during the splicing process.

Fig. 1

als erstes Ausführungsbeispiel in schematischer Darstellung eine Abwickelvorrichtung für Bahnen mit einer Abrolleinrichtung für eine Mutterrolle, mit einer Vorrichtung zum Abtrennen des Endes einer von einer Leerrolle abgewickelten Bahn, mit einer Einrichtung zum Ausheben dieser Rolle aus der Abwickelposition sowie mit einer Spleißvorrichtung zum Verbinden des Bahnendes mit dem Bahnanfang einer neuen Mutterrolle,

Fig. 2

als zweites Ausführungsbeispiel eine Abwandlung des ersten Beispiels hinsichtlich der gegenseitigen Zuordnung der Spleiß- und der Trennvorrichtung sowie der Aushebeeinrichtung mit Speicher,

Fig. 3

als vergrößerte Einzelheit zu Fig. 2 die Zuordnung des Bahnanfangs zum Bahnende für oberseitigen Abzug der Bahn von der Mutterrolle und

Fig. 4

als vergrößerte Einzelheit zu Fig. 2 die entsprechende Zuordnung für unterseitigen Bahnabzug.

Embodiments of the invention are explained below with reference to the drawing. Show it:

Fig. 1

as a first embodiment in a schematic representation of an unwinding device for webs with an unwinding device for a mother roll, with a device for severing the end of a web unwound from an empty roll, with a device for lifting this roll out of the unwinding position and with a splicing device for connecting the web end to the beginning of the web of a new parent roll,

Fig. 2

as a second exemplary embodiment, a modification of the first example with regard to the mutual assignment of the splicing and separating device and the lifting device with memory,

Fig. 3

as an enlarged detail of FIG. 2, the assignment of the beginning of the web to the end of the web for top-side withdrawal of the web from the parent roll and

Fig. 4

as an enlarged detail of FIG. 2, the corresponding assignment for web withdrawal on the underside.

An unwinding device designated by numeral 10 in FIG. 1 has an unwinding device 11 in which parent reels 12 coming from a paper machine, not shown, are unwound. The web 13 running from such a roll runs in the working direction from left to right through a cutting unit, not shown, and is wound up into finished rolls in a subsequent reeling station, such as a supporting roll roll, a backup roll roll and the like.

The mother roll 12 has a continuous roll axis 14 which protrudes with its ends over the end faces of the roll. With these axle ends, the master roller 12 is rotatably supported on guideways 15 of the unrolling device 11 extending on both sides of the end faces of the roller in a horizontally extending plane (in the drawing lying parallel one behind the other). The In the drawing, mother roll 12 assumes its waiting position, shown in solid lines, in unrolling device 11. This position is predetermined by foldable stops 16 on the guideways 15. In the unwinding device 11 there is also a second, emptying roll (empty roll) 17. Further mother rolls coming from the paper machine can be placed on the guideways 15 with a hoist in the area (not shown) to the left of the roll 12.

A transport device 18 is provided for conveying a mother roll 12 into the unwinding position. This consists of one behind the other in the plane of the drawing on swivel levers 19 which engage at the ends of the roller axis 14 and are each movable by a thrust motor (piston-cylinder arrangement) 20.

In order to allow the operating personnel of the unwinding device 10 access to the space between the rollers 12 and 17 located in the waiting position and the unwinding position, the guideways 15 are provided with pivotable bridges 21. On both sides of the guideways 15, machine stands 22 are arranged one behind the other (the front one is not shown in the drawing), which carry a memory 23 for empty rollers 24. A device 25 for lifting empty rolls 17 in the unwinding position is also mounted on the machine stands 22. The lifting device 25 consists of two levers 26 (lying congruently one behind the other in the drawing), which can be pivoted by thrust motors 27 between the unwinding position and the position shown by dash-dotted lines. At the end, the levers 26 are provided with a driver 29 which can be pivoted by a thrust motor 28 and by means of which they can grip the end of the roller axis 30 of the empty roller 17 in the unwinding position.

To the right of the unwinding device 11, the unwinding device 10 has a device 31 for splicing the unwound web 13 with the wound web of a new one in the unwinding position Mother role 12 'on. The splicing device 31 is pivotally mounted on a machine stand 33 with a rocker 32 parallel to the longitudinal axis of the empty roll 17. Serving as drive means serve on the one hand on the rocker 32 and on the other hand on the machine stand 33 supported thrust motors 34 (one behind the other in the drawing). The splicing device 31 has a tubular traverse 35 running parallel to the roller axis 30. This can be moved transversely by means of thrust motors 36 arranged on the rocker arm 32 as a drive means between a rest position (dash-dotted lines in FIG. 1) and a working position shown in solid lines.

The unwinding device 10 is also provided with a separating device 37 for severing the web 13 unwound from a roll 17 transversely to the web running direction. The separating device 37 arranged below the unwinding position of the unrolling device 11 has a web-wide, box-shaped cross member 38, which can be moved in the direction against the splicing device 31 by means of thrust motors 40, which are mounted on a stand 39 and act on the end side of the cross member. The crossmember 38 of the separating device 37 has a crossmember 35 of the splicing device 31 adapted to the path. The traverse 38 of the separating device 37 is equipped with a perforation comb 41 on its edge opposite the web running direction for separating the web 13. In addition, the traverse is provided on its web run-side edge with a hose 42 running parallel to its longitudinal extent.

Finally, the unwinding device 10 has a dancer roller 43 acting on the web 13 in the web running direction after the splicing device 31 and the separating device 37.

The operation of the part of the unwinding device 10 shown in the drawing is as follows:
During the unwinding process of a winding roll in the unwinding position, a new mother roll 12 is conveyed on the guideways 15 into its waiting position determined by the stops 16. Now the bridge 21 of the guideways 15 is pivoted into its vertical position so that an operator of the unwinding device 10 can step into the space between the unwinding roll 17 which is in the unwinding position and the new winding roll 12 resting in the waiting position. The operator produces a web start 44 on the new mother roll 12 and, depending on the top or bottom withdrawal of the web from the roll, provides this with an adhesive application running parallel to the roll axis 14, for example a double-sided adhesive tape 45 (FIGS. 3 and 4). After the operator has emerged from the unrolling device 11, the bridges 21 are pivoted downward so that they assume their position in alignment with the guideways 15.

With the completion of a set of finished rolls wound in the reeling station, not shown, the unwinding device 10 is brought to a standstill. A certain length of the web 13 is stored with the dancer roller 43 while the winding movement is running out (dash-dotted lines). Shortly before the unwinding device 10 comes to a standstill, the crossbeam 35 of the splicing device 31 is moved from its rest position, in which the crossbeam has no web contact, against the separating device 37 in a direction approximately perpendicular to the unwound web. The traverse 35 touches the web 13 running in a straight line (dash-dotted line in FIG. 1) from the empty roll 17. In this operating mode, the splicing device 31 is immersed in the running web (FIG. 4). The splicing device 31 can also be used when the web is at a standstill. In the course of its movement transversely to the direction of web travel, the splicing device 31 on the dancer roller 43 withdraws a certain length of the web 13 which, in the working position of the splicing device 31, envelops the traverse 35 along part of its circumference.

Now, with the unwinding device 10 stationary, the separating device 37 is put into operation by the machine control and the cross member 38 is moved from its rest position (shown in broken lines in FIG. 1) with the push motors 40 in the direction toward the splicing device 31. This movement is completed when the hose 42 in the crossmember 38 is supported against the crossmember 35 of the splicing device 31 with the interposition of the web 13. In this position, the cross member 38 of the separating device 37 has reinforced the wrap around the cross member 35 of the splicing device 31 with the web 13. In addition, the perforation comb 41 of the separating device 37 has penetrated into the web 13 on the side of the splicing device 31 facing the roller. The machine control then brings the lifting device 25 into engagement with the empty roll 17 and lifts it out of its unwinding position. The web 13 is tightened between the empty roll 17 and the splicing device 31 and severed on the perforation comb 41. The lifting device 25 places the empty roll 17 in the memory 23, where it can be fed with a lifting device (not shown) for further use in the paper machine.

The traverse 38 of the separating device 37 is then returned to the rest position by its push motors 40. So that the end 46 of the web 13 formed by the separating process does not slide off the crossbeam 35 of the splicing device 31, this can be subjected to negative pressure and is provided on the circumference with bores for holding the web end (FIGS. 3 and 4). . In the roller 35, the bores 47 are provided on their entire circumference. A parking brake, not shown, ensures in the roller 35 that the web end 46 maintains its position relative to the splicing device 31 after the cutting process.

The thrust motors 20 of the transport device 18 are now put into operation so that the pivoting levers 19 acting on the roller axis 14 of the new mother roller 12, when the stops 16 are disengaged, convey the new roller from the waiting position into the unwinding position. In this position, the roller axis 14 of the parent roller 12 is coupled to a brake generator, not shown. With its help, the mother roll 12 is positioned in the unwinding position so that the adhesive strip 45 on the circumference of the roll is opposite the web end 46 on the cross member 35 of the splicing device 31. Subsequently, the machine control unit activates the thrust motor 34 of the splicing device 31, which moves the cross member 35 in an approximately radial direction with respect to the roller axis 14 against the circumference of the new parent roller 12 in the unwinding position. The path length required for executing this movement is obtained by moving the dancer roller 43 back in the direction of the arrow. The web end held on the crossbeam 35 meets the adhesive tape 45 at the beginning of the web 44. The web 13 which has already been unwound is now securely connected to the web located on the new parent roll 12.

With the splicing process completed, the splicing device 31 is brought into its position shown in FIG. 1 and the cross member 35 is moved into its (dash-dotted) rest position. The unwinding device 10 is thus ready for operation again.

In the exemplary embodiment according to FIG. 2, the reference symbols known from the previous example are used for functionally identical assemblies and components, with an additional dash.

The deviating from Fig. 1 design of the unwinder 10 'of Fig. 2 is due to the fact that the empty roll memory 23' and the lifting device 25 'on a machine frame 33' in the web running direction to the right of the unrolling device 11 ' are. In order to achieve a safe separation of the web 13 'drawn off from an empty roll 17' in the unwinding position, in contrast to the exemplary embodiment according to FIG. 1, the positions of the separating device 37 'and the splicing device 31' are interchanged: the separating device 37 'engages from the top the web 13 'on this, while the splicing device 31' is assigned to the underside of the web. The operation of the unwinding device 10 'corresponds to the device 10 of FIG. 1.

Claims (7)

1. A reeling-off device for paper or cardboard web or the like, which is associated with a carrier cylinder, a support cylinder and the like, with the following features:

   a) a reel-off device (11), in which a supply reel (12) is placed with the ends of its reel axis (14) on guide tracks (15) and is movable by means of a transport mechanism (18) from a standby position to a reeling-off position;

   b) a separating device (37) for separating the length (13), which has been reeled off the supply roll, transversely to the movement direction of the length;

   c) a device (25) for lifting an empty spool (17), which has been separated from the reeled-off length (13), from the reeling-off position and setting it down in a store;

   d) a device for splicing (31) the ends of the reeled-off length to the start of a new supply roll (12) placed in the reel-off position, comprising a tubular traverse (35), which extends parallel with the cylinder axis (14) and which is wrapped around by the end of the length and movable by means of its drive towards the supply reel which is peripherally provided with a glue application,

   e) behind the splicing device (31), as seen in the movement direction of the length, is arranged a dancer roll (43), which on running out of roll (17) dips into the reeled-off length (13) and which retracts during execution of the splicing process:

   characterised in that

   f) the splicing device (31) is movable by its drive (36) from a position in which the traverse (35) has no length contact transversely to the movement direction of the length up to partially wrapping the traverse (35) towards the reeled-off length (13);

   g) when the length comes to a standstill, the separating device (37) takes up an operational position, which clamps the length (13) to the traverse (35) of the splicing device (31) and from which the separating device can be returned into its inoperative position after separation of the length by lifting the empty spool (17) from the unwinding position;

   h) the new supply reel (12') in its reel-off position is fixed in a position in which the applied glue (45) is located on the periphery of the roll in the movement path of the end of the length (46), which after separation is held on the traverse (35) and moved towards the supply roll;

   i) the traverse (35) is arranged as a rotating suction roller, the casing of which comprises suction bores (47);

   j) the section roller (35) is coupled to a locking brake.
2. Device according to claim 1, characterised in that the splicing device (31) has on the one hand the traverse (35) at least virtually rectangular to the reeled-off length (13), and on the other hand drive means (36, 45) which are movable at least virtually radially to the roller axis (30̸).
3. Device according to claim 2, characterised in that the traverse (35) is mounted to be transversely movable by means of thrust motors (36) on a pivotable element (32) which is pivotable parallel to the roller axis (30̸).
4. Device according to claim 1, characterised in that the separating device (37) comprises in front of the traverse (35) of the splicing device (31), as seen in the movement direction of the length, a perforation comb (41) which is laid against the length (13).
5. Device according to claim 1, characterised in that the separating device (37) comprises a hose (42) which pushes the length against the traverse (35) of the splicing device (31).
6. Device according to claim 1 or 2, characterised in that the traverse (35) of the splicing device (31) is arranged on the one side of the length (13), and the separating device (37) on the other side thereof.
7. Device according to claim 1, characterised in that, whilst in the reel-off position, the supply roll (12') is coupled to a braking generator which engages the roller axis (30̸).

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