EP3409818B1 - Cutting device for a nonwoven fabric winder and method for same - Google Patents

Description

The invention relates to a cutting device for a web winder, a web winder equipped therewith and a method for the web winder provided with such a device.

Fleece winder per se are known. They serve to wind a fleece coming out of a card, for example, onto a winding shaft. For this purpose, empty winding shafts are placed in a magazine of the fleece winder and gradually brought into a waiting position. The waiting position serves, on the one hand, to separate the winding shaft from the other winding shafts and, on the other hand, to set it in rotation from the beginning of the actual winding process.

In order to end the winding of a winding shaft and to initiate the winding of a subsequent, empty winding shaft, the fleece must be separated. For this purpose, it is known to move a knife rotating transversely to the axis of rotation of a contact roller of the fleece winder along the axis of rotation of that very contact roller. This has several disadvantages. On the one hand, such a separation process tends to tear the fleece at certain points, so that it is unusable for further use after winding. On the other hand, the contact roller continues to rotate when the fleece is cut. This leads to a cutting pattern that includes an acute angle with respect to the direction of transport of the fleece, which increases the problem of unusable areas of the fleece. To address this problem, fold-out knives have been developed. However, there is the problem with both separation variants that the cut off Fleece does not get safely onto the empty winding shaft to be rewound, where it adheres to an adhesive surface, which is implemented, for example, by means of an adhesive layer.

Known winders for webs of material, having a separating device, of the type mentioned are described in the publications DE 1 5 74 426 B , EP 0 853 060 A1 , WO 2013/156036 A1 and EP 0 957 054 A1 described.

Furthermore, retractable cutting devices for the web of material can be used in the winding machine for the documents WO 96/06791 A1 , JP 2014 198632 A , WO 95/15901 A1 and EP 0 698 571 A2 already known.

The object of the invention is therefore to create a device for a fleece winder which at least reduces the aforementioned disadvantages.

This object is achieved by the subject matter of claims 1, 7 and 8. Advantageous further developments are given in the subclaims.

According to the invention a device is provided which is designed to be integrated into a fleece winder in such a way that the fleece winder is able to separate a fleece at a predetermined position while it is being wound onto a first winding shaft and a partial fleece resulting from the separation, whose has the free end in the transport direction of the fleece to be conveyed against a second winding shaft arranged opposite to the transport direction. I. E. the device is able to actively convey the free end of the fleece in the direction of the empty winding shaft.

The partial fleece is preferably conveyed by means of at least one blower nozzle of the device. The blower nozzle is connected to a compressed air connection and, when the fleece is separated, is arranged in such a way that compressed air coming from the compressed air connection emerges from the blower nozzle, essentially in the direction of the second winding shaft and against a predetermined area of the partial fleece in such a way that the partial fleece against the second winding shaft is blown. This is a particularly simple solution in terms of construction, since this part of the fleece is not attacked mechanically and thus no other problems can be caused, for example due to friction.

In both devices, the separation is implemented by means of a cutting device of the device, which has a holding section. This is designed to be rotatably arranged on the web winder along a contact surface of a contact roller of the web winder in a direction of rotation of the contact roller. The cutting device further comprises a separating section with a cutting section which extends at least over a width of the fleece to be separated. The cutting section is fixed in relation to an axis of rotation of the contact roller or can be driven in an oscillating manner by means of a drive of the cutting device. The cutting device also comprises an actuating section. This is set up to accommodate the separating section in a first state in the holding section in such a way that the cutting device is prevented from coming into contact with the fleece. The cutting device therefore hardly poses a risk of injury to an operator. The actuating section is also set up, in a second state, to move the separating section essentially along a plane of rotation defined by means of the axis of rotation of the device, so that the cutting section is pushed against a side of the fleece facing the contact roller in such a way that the fleece is separated by means of the cutting section. I. E. only at the time of cutting is the cutting section brought into the second state corresponding to a cutting or cutting position. Moving along the plane of rotation enables the cutting device (or its knife section) to sever the fleece essentially parallel and not at an angle to the axis of rotation, which helps reduce the unusable material.

The separating section preferably also has a second section. This extends essentially parallel to the cutting section. The cutting section has a contour that is designed in the second state to hold the fleece in the transport direction in relation to the holding section and / or to cut it due to its shape. In the first case, a further step is necessary, for example by moving the cutting section away from the axis of rotation. In the second case, holding is either not necessary or is done by the cutting section itself when the fleece is severed.

According to the invention, the separating section is arranged in the holding section so as to be rotatable or movable. The actuating section is therefore designed to rotate or drive the separating section back and forth between the first and second states. This is a movement that is easy to automate, in particular since no other movements, for example along the axis of rotation of the contact roller, are required.

The actuating section has a pneumatic cylinder. It is an inexpensive and easy to integrate drive means.

If a holding section is present, the device according to the invention preferably also has a sensor system. This is set up to detect the presence of at least one of the states of the separating section. This ensures that the blower nozzle is only activated when the cutting device is in the second state. It is therefore possible to operate the device according to the invention in a more controllable manner and, moreover, can be integrated very well into the operation of the fleece winder. Apart from that, no blown air and therefore no operating energy are wasted.

The sensor system preferably has at least one sensor which is set up to be coupled to a control circuit of the fleece winder via a connecting section of the device. The connecting section comprises a pivot bearing and a fixed bearing. The fixed bearing has a connection which is accessible from the outside in relation to the fleece winder to connect a first sensor line. It also has an internal sensor line. The pivot bearing is designed to be stationary with respect to the holding section and rotatably mounted with respect to the fleece winder. It also has a second sensor line. This is designed to be coupled to the first sensor line for data transmission at one end in every rotational position and to be coupled for data transmission to the sensor at the other end. This makes it possible to bring the sensor directly into the vicinity of the cutting device in order to detect its current state. From the outside only the control of the web winder has to be connected.

The at least one sensor is preferably formed by means of an electronically and / or pneumatically acting sensor. The sensor lines are accordingly of an electronic and / or pneumatic type. The electronic variant has the advantage of being able to process the sensor signal directly by means of the controller. A pneumatic sensor has the advantage of being able to transmit the signal using simple and inexpensive channels in the rotary and fixed bearing. Outside the arrangement there is also a signal converter that converts the pneumatic signal into a processable electrical signal.

A fleece winder according to the invention has one of the aforementioned devices and a drive. The drive is designed to bring the device from a waiting position into an operating position. After reaching the operating position, the drive is able to engage the first winding shaft Winding up the fleece by the fleece winder also having a rotatably driven contact roller. Furthermore, the fleece winder has a pressure element which is set up to press the first winding shaft against the contact roller. It is also set up to wind the fleece to be wound around a partial circumference of the contact roller due to the rotation of the first winding roll caused by friction between the contact roller and the rotation of the first winding roll on the first winding roll. In addition, the web winder is set up to use the device to separate the web and to convey the partial web in the direction of the second winding roll. A reliable change of the fleece from one winding shaft to the other can thus be achieved, and this with simple and inexpensive means.

A method according to the invention for operating the aforementioned fleece winder has, according to the invention, a step of winding an incoming fleece around the first winding roll. In addition, the method has a step of detecting the presence of a separation state in which the fleece is to be separated. If this state of separation is detected, the method has a step of separating the fleece and, when the fleece has been separated or immediately after it has been separated, conveying the partial fleece in the direction of the second winding shaft. The invention therefore offers a very simple method for changing the fleece from one winding shaft to another.

If the device of the fleece winder is provided with at least one blowing nozzle, the partial fleece is transported or conveyed by applying compressed air to the at least one blowing nozzle. This is also very easy and inexpensive to implement.

According to the invention, the method, during or immediately after the conveying of the partial fleece, furthermore has a step of moving the separating section into the first state. The step of separating the fleece then comprises moving the separating section into the second state. This increases security and is also easy to implement.

Each of the aforementioned methods can furthermore have a step of detecting the presence of an activation state in which the device is to be activated. If the activation state is present, the method further comprises a step of rotating the holding section into a separation position such that the fleece is guided around a surface of the holding section facing away from the contact roller. In addition, it is provided within the scope of the method that the holding section is rotated during or immediately after the conveying of the partial fleece out of the separating position, so that the fleece can freely move past the holding section.

In the case of the two last-mentioned variants, the step of separating the fleece can comprise a translatory back and forth movement of the cutting section along the axis of rotation of the holding section. This makes the separation of the fleece safer.

Figur 1

einen Vlieswickler gemäß einer Ausführungsform der Erfindung,

Figur 2

den Vlieswickler von Figur 1 in größerem Detail,

Figur 3

den Vlieswickler von Figur 1 im Rahmen seines Trennabschnitts vergrößert im Ausschnitt,

Figur 4

den Vlieswickler von Figur 1 im Rahmen seines Trennabschnitts mit teilweise geöffnetem Gehäuse

Figur 5

den Trennabschnitt von Figur 3 ohne Gehäuse,

Figur 6

ein Verfahren zum Betreiben des Vlieswicklers von Figur 1 und

Figur 7

den Prozess des Vliestrennens von Figur 6 in größerem Detail.

Further features and advantages of the invention emerge from the following description of preferred embodiments. Show it:

Figure 1

a fleece winder according to an embodiment of the invention,

Figure 2

the fleece winder from Figure 1 in greater detail,

Figure 3

the fleece winder from Figure 1 enlarged in the context of its separating section,

Figure 4

the fleece winder from Figure 1 in the context of its separating section with the housing partially open

Figure 5

the separation section of Figure 3 without housing,

Figure 6

a method of operating the web winder from Figure 1 and

Figure 7

the process of separating the fleece from Figure 6 in greater detail.

Figure 1 shows a fleece winder 1 according to an embodiment of the invention. The constituents that are not essential to the invention are not explained further.

The fleece winder 1 essentially comprises two frame walls 7, which are combined via unmarked connectors to form a frame which receives or holds all other functional elements of the fleece winder 1.

In a right-hand area, the frame walls 7 have a magazine 2 in which there are unmarked winding shafts (here: two).

Furthermore, the fleece winder 1 comprises a recess on each frame wall 7 which defines a waiting position 3 for a winding shaft. Since the winding shafts are held on both sides by a respective frame wall 7, a waiting position 3 is thus implemented by means of the two frame walls 7.

In the waiting position 3, the winding shaft arranged therein is set in rotation by means of a turning section 12. The turning section 12 makes contact with the area of the winding shaft which is used to receive fleece. I. E. not the entire winding shaft is set in rotation but only the winding section of the winding shaft which is arranged in the middle and which forms the actual winding surface on the circumferential side.

In order to transfer a winding shaft from the magazine 2 into the waiting position 3, a transport section 9 is provided.

Furthermore, the fleece winder 1 has a start-up position 4 which is located in a kink area between the frame wall 7 and a contact roller 8. The contact roller 8 leads the incoming fleece to the winding shaft to be wound in a known manner.

For the automatic change of the fleece from one winding shaft to the next, a separating section 20 is provided, which comprises a cutting section not further designated here.

Furthermore, the fleece winder 1 has a winding position 5, which is implemented by means of a section between the frame wall 7 and the contact roller 8 arranged here on the left. In this position 5, the corresponding winding shaft, which has already picked up fleece in the winding-on position 4, is finally wound.

A locking and movement section 10 is used to transport a respective winding shaft from the waiting position 3 via the initial winding position 4 to the winding position 5.

After the winding of the respective winding shaft, the fleece is separated by means of the separating section 20, and the wound winding shaft is moved into an ejection position 6 of the fleece winder 1 by means of a winding and push-out section 11.

Figure 2 shows the fleece winder 1 in greater detail. Two housing parts 21, 30 thereby form a housing which is arranged rotatably about an axis at both ends by means of pivoting parts 22 arranged here at both ends, which axis coincides with the axis of rotation of the contact roller 8.

In order to bring about the rotary movement of the arrangement 21, 22, 30, a respective drive unit is preferably arranged on both frame walls 7 on their outer sides. In the example shown, this includes an electric motor 26 which is rotationally connected to a drive wheel 24 by means of a gear 27. Each drive wheel 24 is rotationally connected to an associated pivoting part 22 via a belt 23.

The drive wheels 24 of both drive units are preferably rotationally connected to one another via a connecting shaft 25. Thus, only one motor 26 could be sufficient to drive both drive wheels 24.

The drive units are preferably attached to the associated frame wall 7 by means of a respective fastening part 28.

In general, the assembly 21, 22, 30 only rotates in one direction, namely clockwise according to FIG Figure 2 .

Figure 3 shows the fleece winder 1 within the framework of the separating section 20, enlarged in the cutout. The housing part 30 has on the front side here preferably a plurality of through openings 31. Furthermore, the entire housing 21, 22, 30 has an opening on the side pointing upwards here, which in the example shown is formed by means of a recess 32 in the housing part 30.

It is thus possible to let cutting elements 46 protrude through the housing 21, 22, 30 here upward through the recess 32 to the outside.

Furthermore, blow nozzles 51 are provided, only one of which is visible here. These are arranged in such a way that they can allow air to pass through the respective opening 31 to the outside with respect to the housing 21, 22, 30.

Furthermore, a driven gear 29 with a belt 23 arranged around it and the pivoting part 22 can be seen.

Figure 4 shows the separating section 20 with the housing partially open. The housing part 30 is missing as an example.

As can be seen, the cutting elements 46 of a cutting cut 40 are arranged on a shaft 42, the axis of rotation of which coincides with the axis of rotation of the contact roller 8, not shown here.

Figure 4 shows the cutting section 40 in the folded-in position, in which it is not possible for the cutting elements 46 to separate a fleece by means of their cutting edges 41. The cutting elements 46 are located in the interior of the housing 21, 22, 30.

A blow section 50 is accommodated in the housing 21, 22, 30. This comprises several blowing elements 51, which make it possible to let air out here towards the front. The blowing elements 51 are preferably arranged in a rotationally fixed manner on a shaft 52. The shaft 52 is advantageously adjustable on the housing 21, 22, 30 and is rotatably supported here on the pivot part 22. In addition, the shaft 22 is mounted on at least one bearing section 14 which is attached in the housing 21, 22, 30 in order to prevent the shaft 22 from bending.

The pivoting part 22 is preferably fastened to the output gear 29 and also forms a one-sided limit on the left side for the belt 23 looped around the output gear 29. The pivoting part 22 can also be designed in one piece with the output gear 29.

The shaft 42 with the cutting elements 46 non-rotatably arranged thereon also comprises a pivot lever 44, which in turn is non-rotatably arranged on the shaft 42. Furthermore, a fastening element 45 is shown on the right-hand side which rotatably accommodates the shaft 42 on the pivot part 22.

Figure 5 FIG. 13 shows the internal structure of the partition portion 20 from the one in FIG Figure 4 opposite, left end. Both housing parts 21, 30 are missing here.

The shaft 42 is preferably only rotatably received by the fastening element 45, specifically via a pivot bearing 48. Alternatively, the shaft 42 can of course also be supported by means of the pivoting part 22, not shown here.

The cutting elements 46 are fastened to the shaft 42 by means of fastening elements 47.

A free end of the pivot lever 44 is connected via a pivot bearing 49 to a free end of a piston, not designated, of a pneumatic cylinder 43. It is thus possible for the pneumatic cylinder 43 to pivot the pivot lever 44 counterclockwise here by retracting its piston and thus pivot the cutting elements 46 upwards in the same direction around the axis of rotation 42. Thus, the cutting edge 41 of the respective cutting element 46 according to FIG. 2 protrudes from the recess 32 upward out of the housing 21, 22, 30. This makes it possible to separate a fleece arranged above it.

The blower element 51 is attached by way of example by means of fastening elements 57 to a fastening part 55, which in turn is arranged non-rotatably on the shaft 52 via fastening elements 56.

Furthermore, an adjusting screw 13 is shown here floating freely. Actually, it is screwed into the pivoting part 22 (not shown here) and with its end facing the shaft 52 it clamps in the pivoting part 22. For this purpose, the pivot part 22 has a continuous opening so that the screw 13 is accessible from the outside with a screwing tool. It is thus possible to lock the shaft 52 in any rotational position. The blower elements 51 attached to the shaft 52 can thus be aligned in their position with respect to their nozzles 53.

In the example shown, air introduced into the respective blower element 51 via a connection 54 is blown out via the blower nozzles 53 in a direction which includes an acute angle to the folded-in position of the cutting elements 46 shown here. This enables the fleece arranged below the respective cutting edge 41 to be moved in the direction of the winding shaft to be wound.

Figure 6 FIG. 11 shows a method for operating the fleece winder 1.

After starting in a step S1, a subsequent step S2 checks whether there is a winding shaft change, that is to say whether or not a fleece is to be separated.

If this is not the case (no branch after step S2), a jump is made back to step S2.

Otherwise (yes branch after step S2), the separation of the fleece is initiated in a step S10. In parallel to this (dash-dotted line) or afterwards (solid line), the separated partial fleece intended for the new winding shaft is conveyed in a step S3 by means of the blow section 50 in the direction of the new winding shaft.

Immediately after the process in step S10 (dashed line) or after step S3 (dash-dotted line), the cutting section 40 or its cutting elements 46 are folded in again in a step S4.

Then a jump back to step S2 is made.

The step of the final winding of the respective winding shaft has been omitted for the sake of clarity. It is clear, however, that this step is to be provided between steps S1 and S2.

Figure 7 shows the process of separating the fleece in step S10 in greater detail.

In a first step S11, the separating section 20 is rotated into the separating position by means of rotation, specifically by means of the motor 26.

Immediately thereafter (solid line) or parallel to it (dash-dotted line), the cutting section 40 or its cutting elements 46 are unfolded in a step S12. At the end of this step, the cutting edges 41 protrude from the housing 21, 22, 30.

The actual web separation then takes place in a subsequent step S13.

Then, in a last step S14 of this process, the separating section 20 is advantageously moved out of the separating position (i.e. pivoted or rotated) so that the fleece winder 1 or the new winding shaft is or are not hindered in the course of the winding process.

The process in step S10 is then ended.

The invention is not restricted to the preceding embodiments.

In addition or as an alternative to the folding mechanism for the cutting elements 46, provision can also be made for the cutting elements 46 to be operated in an oscillating manner. A link guide is the solution. In this setting, the cutting elements 46 are oscillated in and out of the housing 21, 22, 30 and / or transversely to this direction of movement.

As an alternative to the aforementioned solutions, a conventional, rotating cutting knife can also be provided, which moves along the axis of rotation of the contact roller 8 and thereby rotates about an axis which runs perpendicular to the axis of rotation of the contact roller 8 and is arranged so that the plane of rotation of the cutting knife is parallel to the travel of the cutting knife. In that case, steps S11 and S14 can be omitted.

The preceding explanations can also have a sensor system which is set up to detect when the separating section 20 is in the separating mode, that is to say when the fleece is currently being separated. In the case of a pneumatic drive of the cutting elements 46 or the cutting knife, the sensor system can have a pneumatic sensor. This enables the coupling to an evaluation circuit arranged externally in relation to the separating section, even if this means signal transmission from a stationary part (for example the frame wall 7) and a movable part (for example the housing 21, 22, 30).

In the case of a pneumatic sensor, this is preferably connected to a signal converter outside the separating section 20, which converts the sensor signal of the pneumatic sensor into an electrical signal and is coupled to a corresponding control circuit. This makes it possible to continue to use electrical control circuits.

The tips of the cutting edges 41 can be replaced by any other contour or combined with one that enables the nonwoven to be separated.

Of course, instead of a pneumatic drive (pneumatic cylinder 43), an electric motor drive can also be provided.

The belt 23 can of course be replaced by any other traction means such as a chain.

As a result, the invention creates a simple but safe device for separating fleece, which can be easily integrated into fleece winder and also enables a very simple operating method.

List of reference symbols

1

Fleece winder

2

magazine

3

Waiting position

4th

Winding position

5

Wrapping position

6th

Extension position

7th

Rack wall

8th

Contact roller

9

Transport section

10

Locking and moving section

11

Winding and pushing out section

12th

Turning section

13th

Adjusting screw

14th

Warehouse section

20th

Separation section

21

Housing part

22nd

Swivel part

23

belt

24

drive wheel

25th

wave

26th

engine

27

transmission

28

Fastening part

29

Output gear

30th

Housing part

31

opening

32

Recess

40

Cutting section

41

Cutting edge

42

wave

43

Pneumatic cylinder

44

Swivel lever

45

Fastener

46

Cutting element

47

Fastener

48.49

Pivot bearing

50

Blow section

51

Blowing element

52

wave

53

jet

54

connection

55

Fastening part

56.57

Fastener

Si; i ∈ N

step

Claims (12)

1. A device,

   • configured for being incorporated into a web winder (1) such that the web winder (1) is able to

   - sever the web at a predetermined position during winding on a first winding shaft, and

   - transport a partial web, which results from severing, the free end thereof pointing in transport direction of the web, towards a second winding shaft, which is disposed opposite the transport direction,

   • wherein severing is realized by means of a cutting device (20, 40) of the device, including

   - a retaining section (21, 22, 23), configured for being rotatably disposed at the web winder (1) along a contact surface of a contact roll (8) of the web winder (1) in a direction of rotation of the contact roll (8),

   - a severing section (20) with a cutting section (40), wherein the cutting section (40)

   • extends at least over a width of the web to be severed,

   • with regard to an axis of rotation of the contact roll (8) is disposed

   ° stationarily or

   ° oscillatingly drivable by means of a drive (23 to 27) of the cutting device (20, 40),

   • is rotatably or in a protruding manner disposed in the retaining section (21, 22, 23), as well as

   - an actuating section (43),

   • adapted for accommodating the severing section (20)

   ° in a first condition, in the retaining section (21, 22, 23) so that the cutting section (40) is prevented from getting into contact with the web, and

   ° in a second condition, for moving the severing section (20) essentially transversely to a plane of rotation of the device, which is defined by means of the axis of rotation of the device, so that the cutting section (40) is urged against a side of the web facing the contact roll (8), such that the web is severed by means of the cutting section (40),

   • configured for rotating back and forth, respectively for moving the cutting section (40) between the first and the second condition, as well as

   • including a pneumatic cylinder (43) as the drive means.
2. The device according to claim 1, in that the transport of the partial web is realized by means of at least one blow nozzle (51) of the device, which

   • is connected to a compressed air connection (54), and

   • upon severing the web, is disposed so that compressed air coming from the compressed air connection (54) exits from the blow nozzle (51),

   - essentially in the direction of the second winding shaft, and

   - is blown against a predetermined area of the partial web such that the partial web is blown against the second winding shaft.
3. The device according to any of the preceding claims, wherein the severing section (20) further includes a second section, which

   • essentially extends parallel to the cutting device (20, 40),

   • has a contour, which, in the second condition, is configured

   - for retaining the web in transport direction with regard to the retaining section (21, 22, 23) and/or

   - for cutting based on the shape thereof.
4. The device according to any of the preceding claims, furthermore including a sensor system adapted for detecting the presence of at least one of the conditions of the cutting section (40).
5. The device according to claim 4, wherein

   • the sensor system includes at least one sensor, adapted for being coupled to a control circuit of the web winder (1) via a connection section of the device, and

   • the connection section comprises a rotary bearing and a fixed bearing,

   • the fixed bearing, which

   - includes a connection, which is accessible from outside with regard to the web winder (1), for connecting a first sensor line, an d

   - includes an inner sensor line, and

   • the rotary bearing, which

   - is stationarily disposed with regard to the retaining section (21, 22, 23),

   - is configured for being rotatably supported disposed with regard to the web winder (1), and

   - includes a second sensor line, configured for

   ° at one end in any rotary location, being coupled as data-transmitting to the first sensor line, and

   ° at the other end, for being coupled as data transmitting to the sensor.
6. The device according to claim 5, wherein

   • the at least one sensor is formed by means of an electronic and/or pneumatic acting sensor, and

   • accordingly, the sensor lines are of an electronic and/or pneumatic type.
7. A web winder (1),

   • including

   - a device according to any of the preceding claims,

   - a drive (23 to 27), configured for bringing the device from a waiting position to an operating position, and

   • adapted

   - for winding a web on the first winding shaft, in that the web winder (1) further includes

   ° a rotatably driven contact roll (8),

   ° a pressure element, adapted for pressing the first winding shaft against the contact roll (8),

   - for winding the web to be wound on the first winding shaft, in a manner guided around a partial circumference of the contact roll (8) based on the rotation of the first winding shaft caused by the friction between the contact roll (8) and the first winding shaft, as well as

   - by means of the device,

   ° for severing the web, and

   ° for transporting the partial web in the direction second winding shaft.
8. A method for operating a web winder (1) according to claim 7, including the steps

   • winding an arriving web around the first winding shaft,

   • detecting (52) the presence of a severing condition, in which the web is to be severed,

   • when detecting the presence of the severing condition,

   - severing (S10) the web, and

   - when severing or directly after realized severing the web, transporting (S3) the partial web in the direction second winding shaft.
9. The method according to claim 8, wherein

   • the device is formed according to claim 2, and

   • transporting (S3) the partial web is realized in that compressed air is admitted in the at least one blow nozzle (51).
10. The method according to claim 8 or 9, wherein

    • the method further includes, when transporting or directly after transporting (S3) the partial web, a step (S4) of moving the cutting section (40) to the first condition, and

    • the step (S10) of severing the web comprises moving (S12) the cutting section (40) to the second condition.
11. The method according to any of the claims 8 to 10, furthermore including

    • a step (S2) of detecting the presence of an activating condition, in which the device is to be activated,

    • upon detected presence of the activating condition, rotating (S11) the retaining section (21, 22, 23) to a severing position such that the web is guided around a surface of the retaining section (21, 22, 23) facing away from the contact roll (8), and

    • when transporting or directly after transporting (S3) the partial web, rotating (S14) the retaining section (21, 22, 23) out of the severing position, so that the web is freely movable past the retaining section (21, 22, 23).
12. The method according to claim 10 or 11, wherein the step (S10) of severing the web comprises translatory moving the cutting section (40) back- and forth along the axis of rotation of the retaining section (21, 22, 23).

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