EP1295830B2 - Roll changer and method for the automatic change of rolls during stop - Google Patents

Abstract

The reel-changer incorporates a first mounting (1,4) for the working roller, and a second mounting (2,5) for the reserve roller. The reserve and working webs are joined by a connector (10). A holder (21) for fixing the working web is situated down-path from the connector. A traction piece (16), in the form of a tensioning device, between the connector and holder is positioned in the path of the working web and pulls the working web from being stationary away from the working roller. The traction piece consists of at least one cylinder (17) and a drive mechanism (19).

Description

The invention relates to a roll changer for a web-processing or processing machine, which is set up for a roll change at standstill of the roll changer. The invention further relates to a method for an automatic reel change in such a machine, in which a web to be replaced, although retracted into the machine, but is not in production. Such reel changers are eg from the DE 1256501 , of the US 5,514,237 , of the US 5,064,488 and the US 4,892,263 known.

Web-fed rotary printing machines, which are preferred examples of web-processing machines for the purposes of the invention, usually have reelstands which are capable of carrying out a so-called flying reel change. At a unwinding in the reel splitter from a work roll working web is fully automatically added in a flying reel change during production a stock web and connected to the work path. The supply track winds in the roll changer from a supply roll. The work path is cut, and the old work role either also fully automatically or manually taken from the reel changer and replaced, for example, against a new supply roll. The supply track attached to the working track is the new working track.

Although reelstands that are set up for a flying reel change are standard, at least for large newspaper presses, the reel change causes problems when the reelstand is at a standstill. In particular, no reel changers are known which are set up both for a flying reel change and for a fully automatic reel change when the reel changer is at a standstill.

It is therefore an object of the invention to enable an automatic roll change at standstill of the roll changer, preferably in a roll changer, with a flying role change is feasible.

The invention is based on a reel splicer for a web processing machine, which is set up for processing a work web to be processed from a work roll, attaching a supply web to the work web and connecting the two webs to one another. A preferred example of a web-processing machine is a web-fed rotary printing press, preferably an offset press for newspaper printing, especially newspaper printing in large runs. However, the machine may also be a web-processing machine for plastic or metal and basically any web-like material, for example a plastic film, a metal foil, but more preferably paper. As a work path in the context of the invention, the one web is referred to, which is already fed into the machine and is to be replaced by the supply track, for example, according to consumption.

The reel changer has a first storage for the work roll and a second storage for the supply roll. The bearings are preferably movable in the reel changer so that they are movable in alternation in a working position and in an exchange position. The working position advantageously also forms a joining position, which is an adhesive position when joined by gluing. Preferably, the bearings are formed by roller arms, which are pivotable alternately in the working position and in the replacement position. The roll changer further comprises a connecting device for connecting the supply web with the working web. The connecting device is preferably designed as an adhesive device in order to produce an adhesive bond between the working web and the supply web. This is the usual connection technology for webs in web-fed rotary printing. In machines for processing or processing plastic films, however, the connecting device can also be formed, for example, by a welding device; also in machines for the treatment or processing of metallic webs. However, other suitable joining techniques should also not be excluded, even for paper webs.

The roll changer further comprises a holding device, which in the conveying direction of the working path behind the connecting device, i. down the connection device is arranged. The holding device is designed such that it can fix, preferably completely block, the working path in relation to the conveying direction. The fixation is preferably carried out exclusively by frictional engagement, particularly preferably by clamping the work path.

The reel changer finally includes a draw gear for the work path. The traction device is arranged in the path of the work path between the connecting device and the holding device and set up or designed so that it can pull the working web from the work roll. The removal from the work roll is either entirely without engine assistance or with engine assistance or even against a braking force that may be generated by a drive motor or an additional brake. In any case, an advantageous web tension is generated and maintained by means of the pulling device, optionally in conjunction with a rotary drive of the work roll or a brake for the work roll, during the peeling. Although the traction device may be a traction device with which the web is also conveyed during ongoing production, the trajectory is preferably conveyed by the traction device only when the reelstand is at a standstill, but this length must of course be sufficiently great establish the connection of the supply track with the work path and the automatic roll change with fixed work path to carry out. If the towing device promotes the web in the current production, this is preferably done only temporarily.

A particularly elegant solution is the use of a clamping device, which serves to compensate for web tension fluctuations during ongoing production of the machine, as a pulling device. For this purpose, known web tension devices, such as pivotally or linearly movably mounted pendulum rollers and equivalent roller devices, which are wrapped by the web and regulate by their own movement transversely to its longitudinal axis, the web tension by changing the length of the web path. The tensioned by the web clamping element, a cylinder body in the case of a roller or possibly even a simple rod or the plurality of cylinder body in the case of a roller device is mounted movable against the elasticity of a return element transverse to its longitudinal axis. In the development according to the invention to a traction device, the clamping element is further coupled with a drive causing this transverse movement. The drive may be, for example, an electric motor or a fluid drive, in particular a piston-cylinder arrangement. Such a pulling device known from tensioning devices can also be used only as a pulling device and does not have to be used as a tensioning device. A restoring element for generating a restoring elasticity force does not necessarily have to be present accordingly.

The holding device can in principle be formed by one or more of the roll changer in the path of the work following loading or processing facilities of the machine, which is counted for the purposes of the invention in such a design of the holding device belonging to the reel splitter or be. Preferably, however, the holding device is formed on the web path of the work path in front of the first processing or processing device, which follows the traction device according to the invention, to obtain a short path between the traction device and the holding device. By means of the holding device, it must be ensured that the stationary working path can actually be pulled by the pulling device by a sufficient track length from the working roller. The work path must be pulled out at least by such a length that the connection to the work path can be made. Preferably, the web start of the supply roll should be replaced by the withdrawal from the supply roll. The holding device must therefore fix the web at least in the sense that the working web is not pulled out of the machine in the direction of the roll changer by means of the pulling device, while a withdrawal or withdrawal of the working web from the work roll does not take place to a sufficient extent.

In a web-fed rotary printing press, the holding device can in particular be formed by a draw roller or a plurality of draw rollers, which are or are arranged in the path of the work path in front of the first printing unit, in particular by an infeed mechanism for the printing unit or several printing units. This applies analogously to the corresponding devices in other web-processing or processing machines as well. For the roll change at standstill such a tension roller or the plurality of tension rollers is set, i. the tension roller or tension rollers is or are preferably blockable. If the coefficient of friction between the web and such a tension roller or a plurality of tension rollers is already sufficient for a fixation of the web, an already existing traction device can directly form the holding device according to the invention. Preferably, however, adjacent to one of the traction device according to the invention next following tension element, in particular tension roller, a pressure element arranged so that the pressure element can be pressed against the tension member to clamp the web between the tension member and the pressure element and hold so that the web through the Action of the pulling device according to the invention can not be retracted backwards.

In a method according to the invention for an automatic standstill roll change in a web processing machine, at least the following operations are performed: The supply roll is moved to a joining position. In the joining position, the supply web wound up into the supply roll lies parallel to the working web drawn into the machine at a distance, so that in the case of its development the supply web comes to lie exactly in coincidence with the working web. The work path is pressed in the joining position of the supply roll to a web start of an outermost web layer of the supply roll and connected to this web start. The work path is fixed downstream of the web start of the supply roll, preferably clamped so that it does not move under the influence of acting for the role change tensile forces at the location of fixation or at least not in a practically relevant extent in the web longitudinal direction. The fixation is preferably carried out before the connection is made. The fixation can be made after pressing the working web to the supply roll or preferably before pressing. It should also not be ruled out that the work path has already been fixed before the supply roll has taken the joining position. After making the connection, a tensile force is exerted on the fixed work path at a point between the web start of the supply roll and the point of fixation and the work path thereby pulled from the work roll. Finally, the work path is severed at a point between the work roll and the web start of the supply roll.

During the extraction process of the work roll, the unwinding of the working web from the Work roller controlled, for example by the work roll is driven in a tuned to the withdrawal speed of the pulling device according to the invention manner of a rotary drive motor. Instead of by a coordinated in this sense, preferably controlled drive the work role, the controlled development can also be advantageously effected by a controlled braking of the work roll to adjust a favorable for the withdrawal web tension.

Figur 1

einen Rollenwechsler mit einer verbrauchten Arbeitsrolle und einer neuen Vorratsrolle vor einem Rollenwechsel,

Figur 2

den Rollenwechsler in einem Zustand, in dem eine von der Arbeitsrolle ablaufende Arbeitsbahn an die Vorratsrolle angedrückt ist,

Figur 3

den Rollenwechsler nach einem teilweisen Ausziehen der Arbeitsbahn,

Figur 4

den Rollenwechsler nach Ablösen einer Vorratsbahn von der Vorratsrolle und

Figur 5

den Rollenwechsler nach dem Rollenwechsel.

A preferred embodiment of the invention will be explained below with reference to figures. The features disclosed in the exemplary embodiment advantageously each individually and in each combination of features form the subject matter of the claims. Show it:

FIG. 1

a roll changer with a used work roll and a new supply roll before a roll change,

FIG. 2

the reel changer in a state in which a working web running from the work roll is pressed against the supply roll,

FIG. 3

the reel changer after a partial removal of the working web,

FIG. 4

the reel changer after detachment of a supply web of the supply roll and

FIG. 5

the reel changer after the roll change.

The figures show a roll changer for web-fed rotary printing presses which is set up to receive two rolls of paper R1 and R2. It has a first roller arm 1 which rotatably supports the roller R1 about a rotation axis 4. The roller R1 forms a working roll from which a working web A drawn into the printing press unwinds. The other roller R2 is also rotatably mounted on a second roller arm 2 about an axis of rotation 5 formed by this roller arm 2. The second roll R2 is a supply roll of a supply web V, which is to replace the almost used work roll R1. A motor M1 forms a rotary drive for the work roll R1, which rotates the work roll R1 about the rotation axis 4 during operation of the machine. A similar motor M2 forms a rotary drive for the supply roll R2 in order to drive the supply roll R2 about its axis of rotation 5.

The two roller arms 1 and 2 form aligned pivot arms about a common pivot axis 3. Another motor M3 forms a pivot drive for pivoting the roller arms 1 and 2 about the pivot axis 3. By the pivoting movement in the counterclockwise direction, the roller arm 2 in the for the roller arm. 1 be pivoted in the figures shown pivot position. Accordingly, in such a pivotal movement of the roller arm 1 is pivoted in the pivot position shown in the figures for the roller arm 2. Furthermore, two guide rollers 9 are pivotable on pivot arms about the pivot axis 3. The pivot arms for the guide rollers 9 are torsionally rigidly connected to the roller arms 1 and 2 and form a cross with these.

In addition to the described bearing device for the rollers R1 and R2, the reel changer comprises a connecting device 10, a pulling device 16 and a holding device 21 along a path formed for the working path A.

The connecting device 10 is designed as an adhesive device. It comprises, as a joining element, an adhesive roller 14, which is rotatably mounted on a pivoting arm 11 of the supply roll R2 opposite. The pivot arm 11 is pivotable about a pivot axis 12 which is parallel to the axis of rotation 5 of the supply roll R2. Also, the axis of rotation of the adhesive roller 14 has parallel to the axis of rotation 5. The adhesive roller 14 is, as in FIG. 1 indicated, by means of the pivoting movement about the pivot axis 12 to the supply roll R2 pressed. The pivoting movement towards the supply roll R2 and away from the supply roll R2 is effected by means of a pivot drive 13, which is formed by a piston-fluid-cylinder arrangement. The working web A is guided in the position of the work roll R1 shown in the figures between the supply roll R2 and the adhesive roll 14.

In the path of the work A, immediately behind the connecting device 10, the pulling device 16 is arranged. The pulling device 16 comprises a cylinder body 17, which is pivotably mounted on a pivoting arm about a pivot axis 18. The cylinder body 17 is freely rotatably mounted about its longitudinal axis and is formed in the embodiment of a web-width roller body. The working path A wraps around the cylinder body 17 with a wrap angle of more than 90 ° and is deflected down the track of the cylinder body 17 about a guide roller 20. The working path A is freely stretched between the guide roller 9 of the roller bearing and the cylinder body 17, i. There are no other deflecting elements in this part of the railway. Only the connecting device 10 acts to produce the joint connection in this track section on the working path A. Basically, however, before and / or behind the connecting device 10 further deflecting be arranged.

The cylinder body 17 preferably forms a per se known pendulum roller, as in the embodiment, which serves to compensate for web tension fluctuations. The cylinder body 17 is accordingly against a resilience of a return element, such as a compression spring or a fluidbeaufschlagter cylinder, pivotable about the pivot axis 18, wherein the cylinder body 17 is moved by the wrapping work A due to the web tension against the force of the return element. The traction device 16 is equipped with a drive 19, which corresponds to the example selected Pendelwalzenanordnung is designed as a pivot drive. The drive 19 is preferably a piston-fluid cylinder arrangement and serves to pivot the cylinder body 17 about the pivot axis 18. In the figures, an average normal or nominal position and two positions of the cylinder body 17 located on both sides of the central position are shown.

In the path of the work path A follows on the thus formed tensioning and pulling device 16, the holding device 21. The holding device 21 includes a rotationally driven cylinder body 22 which is looped by the working line A. In the exemplary embodiment, the cylinder body 22, as is preferred, a draw roller. Between the guide roller 20 of the tensioning and pulling device 16 and the tension roller 22, the working path A is tensioned freely, i. In this track section, there are no further elements acting on the working track A. In principle, however, deflecting bodies can be arranged therebetween. The holding device 21 is preferably formed by a home-made pulling device, which is arranged between the tensioning and pulling device 16 and the closest in the web path printing unit of the machine. If such an intake train has a plurality of draw rollers, preferably the train roller closest to the tensioning and pulling device 16 forms the cylinder body 22. To ensure that the work path A can be fixed by the holding device 21 in such a way that it can be subject to the influence of the When a roller change effective tensile forces is not moved, the cylinder body 22 opposite a formed by a clamping element 23 blocking element is arranged, which can be turned off to the cylinder body 22 and from the cylinder body 22, for example by means of a pivotal mounting of the clamping element 23. The clamping element 23 when forming the cylinder body 22 as a roller preferably also formed by a roller body which is not rotatable for the purpose of fixing the working path A about its own longitudinal axis.

Finally, the roll changer also comprises a sensor 7 directed onto the surface of the supply roll R2. The sensor 7 serves to detect a splice 6 on which a web start of the supply web V is glued to a next web layer of the supply roll R2.

A control device 24, the signals of the sensor 7 are supplied. The control device 24 is used to control and preferably also control of the drives M1, M2, M3, 13 and 19, a rotary drive for the cylinder body 22 and a drive for switching on and off of the clamping element 23. The corresponding connections with the said drives for transmission the control signals are shown in dotted lines. The connection can in each case be wired or wireless, for example by radio or optical, executed. By means of the control device 24, the roll change is carried out automatically at least after an optionally manual insertion of the supply roll R2 and removal of the old, for example, used work roll R1. This applies to a flying reel change during production and, according to the invention, also for a reel change to be performed at standstill of the reel changer.

An automatic roll change at standstill is described below. The time sequence sequence at standstill change is in the FIGS. 1 to 5 shown.

FIG. 1 shows the reel changer with retracted work A. The unwound from the work roll R1 working web A is first passed through the one of the guide rollers 9 and between the supply roll R2 and the connecting device 10 through to the tensioning and pulling device 16, wraps around the cylinder body 17 by about 140 °, is deflected immediately behind the cylinder body 17 from the guide roller 20 to the cylinder body 22 of the holding device 21, wraps around the cylinder body 22 by preferably at least 90 ° and is finally guided from there through the first printing nip of the printing press. In the in FIG. 1 illustrated state of the roll changer is the work roll R1 in a working position and the supply roll R2 in a joining or adhesive position, from which they are further pivoted after bonding in a working position for the current supply roll and new work roll R2. The pivot arm 11 with the adhesive roller 14 is in an initial position in which the working path A is not touched, that is, the working path A runs freely in the state shown between the supply roll R2 and the connecting device 10. The cylinder body 17 of the tensioning and pulling device 16 is held by the drive of the work roll R1 by means of the working web A, ie by their web tension, in a forward position in which the web path between the next adjacent guide rollers 9 and 20 on both sides of the cylinder body 17th has its smallest length. The working path A is already fixed by the holding device 21 by the clamping element 23 is pressed with a pressing force against the cylinder body 22 and the web A is firmly clamped in the nip formed between the cylinder body 22 and the surface preferably elastically resilient clamping member 23 formed.

The supply roll R2 takes in the in FIG. 1 shown state of the reel changer already a defined rotational position. For this purpose, the supply roll R2 was previously rotated in the illustrated pivot position by means of the motor M2. During this rotary movement, the splice 6 was detected by means of the sensor 7 and determined by the control device 24. After the detection of the splice 6 and the determination of the rotational position of the supply roll R2 was controlled by the motor M2 controlled by the controller 24 in the illustrated rotational angular position with the rotational position angle α rotated and preferably set in this rotational position. The rotational position angle α defining this rotational position is the Measured in angular degrees distance, the splice 6 from the contact point of the adhesive roller 14 has when the adhesive roller 14 is pressed against the supply roll R2.

FIG. 2 shows the state of the roll changer after the adhesive roller 14 has been pivoted about the pivot axis 12 and turned against the supply roll R2 and is now pressed against its surface. Otherwise take all other elements of the roll changer including the holding device 21 still the same positions as in the state of FIG. 1 one. If necessary, the work roller R1 was rotated a little by pressing.

FIG. 3 shows the entire arrangement, after the work path A by means of the pulling device 16 already a distance from the in FIG. 2 shown state has been deducted from the work roll R1. In order to exert the necessary tensile force on the work A, the cylinder body 17 of the drive 19 about the pivot axis 18 and against the web tension in the in FIG. 3 shown, middle target position pivoted. This setpoint position assumes the cylinder body 17 during operation also, but pivots freely according to the interaction of the web tension and the return element. During the extraction of the working web A by means of the drive 19 forced pivoting movement of the cylinder body 17, the rotational movement of the work roll R1 by means of the motor M1 and / or a brake 8 is controlled so that adjusts a favorable web tension and Auszugsgeschwindigkeit. Particularly preferably, an additional brake 8 is not required in this case. Rather, it is driven during the extraction of the working path A of the motor M1 at a defined speed or even works as a brake generator, and it is the cylinder body 17 acted upon by the drive 19 with a defined restoring force, so that the cylinder body 17 assumes the middle target position. The pull-out movement of the working line A is in FIG. 3 indicated with two solid arrows in the railway.

During the pull-out movement, the supply roll R1 is due to the friction caused by means of the pressing adhesive roller 14 from their in the FIGS. 1 and 2 shown angular position in the in FIG. 3 shown rotational position has been rotated, in which the splice 6 comes to rest under the adhesive roller 14. Since the splice 6 has been previously made "sharp", the working web A is pressed by the adhesive roller 14 firmly against the splice 6 having web start of the supply web V in the rotational angle position shown and thereby the web start of the supply web V glued to the work path A. The braking force of the brake 8 is adjusted by the control device 24 in accordance with the pivoting movement of the cylinder body 17 of the pulling device 16. The tuning is such that the braking force of the brake 8 is set so that the cylinder 17 of the pulling device 16 performs a pivoting movement at a defined speed up to a rear position, which in FIG. 4 is shown in a solid line. Instead of an additional brake 8, the motor M1 can be operated as a brake generator. In particular, a motor for both directions of rotation form the motor M1. Such a motor with reversible directions of rotation may additionally be designed as a brake generator.

FIG. 4 shows in the sequence the state in which the cylinder body 17 assumes its rear position and the working path A has therefore been pulled out during the standstill roll change by the maximum extension length. During the entire extraction process, ie from the in FIG. 2 up to the in FIG. 4 As shown, the adhesive roller 14 is pressed against the supply roll R2. After making the connection, which is primarily in the in FIG. 3 shown state is effected by the further pressing of the adhesive roller 14 a clean detachment of the web start of the supply web V of the supply roll R2. In the in FIG. 4 shown state of the web beginning of the supply web V is already detached from the supply roll R2. Further, after the detachment of the web start already the working web A behind the splice 6, ie, as in the embodiment even more preferably behind the adhesive roller 14, has been cut by means of Kappmessers 15. FIG. 4 shows the old work A immediately after the cap.

After capping the brake 8 is released, and it is the working web A wound by reverse rotation of the work roll R1 again to the capped web start of the work A on the work roll R1. This condition is in FIG. 5 shown. Subsequently, the old work roll R1 can be taken out of the roll changer automatically or by hand.

After the connection has been made and the web start of the supply web has been detached from the supply roll R2, the connecting device 10 is again turned off by the supply roll R2. Subsequently, the cylinder body 17 by the drive M1 of the work roll R1 from his in FIG. 4 shown rear position back to the middle position (target position) moves, the cylinder body 17 also occupies the later operation of the machine or to which it oscillates in the event of web fluctuations. The work A is still fixed by the holding and pulling device 21 while. During the return movement of the cylinder body 10 into the middle position, the supply roll R2, from which the working web subsequently unwinds, is turned back in order to keep the web tension constant or at least substantially constant. The reverse rotation is indicated by the indicated rotary arrow. The role change is in this, in FIG. 5 displayed state completed.

If the drive 19 is a pneumatic drive, it can also form the return element for the elastic compensation of web fluctuations. However, it has no elasticity, because it is formed for example by a hydraulic drive or electric drive, such a drive 19 is disengaged for the purpose of web tension compensation during machine operation.

To record the production with the new work path formed by the supply track, only the fixation between the cylinder body 22 and the clamping element 23 has to be released by parking the clamping element 23.

Reference numerals:

1

Storage, first roller arm

2

Storage, second roller arm

3

swivel axis

4

axis of rotation

5

axis of rotation

6

splice

7

sensor

8th

brake

9

deflecting

10

Connecting device, adhesive device

11

swivel arm

12

swivel axis

13

Rotary actuator

14

Pressing element, adhesive roller

15

Cutting knife

16

drawbar

17

Cylinder body, pendulum roller

18

swivel axis

19

drive

20

deflecting

21

holder

22

Tension element, tension roller

23

Clamping element, blocking element

24

control device

A

working web

V

supply web

M1

roller drive

M2

roller drive

M3

Rotary actuator

R1

work role

R2

supply roll

α

Rotational position angle

Claims (13)

1. A reel changer for a web processing machine, said reel changer being equipped for unwinding a working web (A) to be processed from a working reel (R1) and for connecting a supply web (V) from a supply reel (R2) to the working web (A), and comprising:

   a) a first bearing (1, 4) for the working reel (R1) and a second bearing (2, 5) for the supply reel (R2);

   b) a connecting means (10) for connecting the supply web (V) to the working web (A);

   c) a holding means (21), arranged downstream of the connecting means (10) on the web, for fixing the working web (A);
   characterised by:

   d) a drawing means (16) which is arranged in a web path of the working web (A) between the connecting means (10) and the holding means (21) and equipped for drawing the working web (A) from the working reel (R1) from a standstill of the working reel (R1).
2. The reel changer according to claim 1, characterised in that a tensioning means, which serves to equalise variations in web tension while the machine is running, forms the drawing means (16).
3. The reel changer according to any one of the preceding claims, characterised in that the drawing means (16) comprises at least one cylinder body (17) and a drive (19), by means of which the cylinder body (17) can be moved transversely with respect to the working web (A), in order to draw the working web (A) from the working reel (R1).
4. The reel changer according to the preceding claim, characterised in that the cylinder body (17) is mounted such that it can move transversely with respect to its longitudinal axis, against an elasticity force of a restoring means, wherein the elasticity force counteracts a force which acts on the cylinder body (17) from the working web (A).
5. The reel changer according to any one of the preceding two claims, characterised in that a dancing roller which is mounted such that it can move, preferably pivot, transversely with respect to the working web (A) forms the cylinder body (17).
6. The reel changer according to any one of the preceding claims, characterised in that the connecting means (10) is arranged opposite the supply reel (R2) situated in a jointing position and is mounted such that it can be adjusted to the supply reel (R2).
7. The reel changer according to any one of the preceding claims, characterised in that the holding means (21) comprises a drawing element (22) for conveying the working web (A) or is already formed by the drawing element (22) alone.
8. The reel changer according to the preceding claim, characterised in that the holding means (21) comprises a clamping element (23) which can be pressed against the drawing element (22) for fixing the working web (A) due to the clamping between the drawing element (22) and the clamping element (23).
9. The reel changer according to any one of the preceding claims, characterised in that a drawing means which is arranged in the web path of the working web (A), before a processing means of the machine which immediately follows the reel changer, forms the holding means (21).
10. The reel changer according to any one of the preceding claims, characterised in that a motor (M1) for a rotary drive of the working reel (R1) is formed as a brake generator.
11. A method for an automatic reel change in a web processing machine, wherein:

    a) a supply reel (R2) of a supply web (V) is moved up to a jointing position in relation to a working web (A) which is drawn into the machine and unwinds from a working reel (R1);

    b) the working web (A) is pressed onto and connected to the beginning of a web of the supply reel (R2);

    c) the working web (A) is fixed downstream on the web of the beginning of the web of the supply reel (R2);
    characterised in that:

    d) a drawing force is exerted on the fixed working web (A) at a point between the beginning of the web of the supply reel (R2) and the point of fixing, and thus the working web (A) is drawn from the working reel (R1);

    e) when the working web (A) is drawn, the supply reel (R2) is rotated by pressing on the working web (A) or by a drive on its own; and

    f) once the connection has been established, the working web (A) is separated at a point between the working reel (R1) and the beginning of the web of the supply reel (R2).
12. The method according to the preceding claim, characterised in that the working web (A) pressed onto the supply reel (R2) is tensioned by braking the working reel (R1) or driving the working reel (R1) in a controlled manner.
13. The method according to any one of the preceding claims, characterised in that once the working web (A) has been separated, and the fixing still exists, the supply reel (R2) is rotated back, counter to the conveying direction of the supply web (V) forming a new working web, in order to tension the new working web.

Images