EP3514090B1 - Device for automatically cutting and removing a web and method for same with an auxiliary roller - Google Patents

Description

Devices for the edge-side cutting of a material web in the form of a plastic film web are known. The edge-side trimming of such a material web is customary in order to produce a clean edge area of the material web and, for example, to change or eliminate width fluctuations.

It has been shown that in the case of more sophisticated production systems for the production of the material webs just mentioned, such as plastic films, it is known not only to suck off or remove the edge strips produced, but to wind up these edge strips at least for orderly disposal or recycling or inline one To be recycled.

Since the edge strips are produced by a continuous cut in the longitudinal direction, it is necessary at the beginning of the cutting process that above all the end of the edge strip, i.e. H. also to cut transversely to the longitudinal direction L the area in which the longitudinal cutting knife first entered the material web to cut the same.

The DE 20 2011 004 608 U1 shows a device in which a longitudinal cutting knife continuously cuts the material web into a partial web and an edge strip. The longitudinal cutting knife creates an incision which at the same time forms the boundary between the partial web and the edge strip. The transverse severing of the material web, in particular the edge strip, is carried out by a transverse severing knife which has a cutting blade and a separating device which, before the transverse severing of the edge strip, separates the edge strip from the partial web. As the cross cutting knife approaches the material web, the cutting blade finally cuts through the edge strip, the material web fed further in the longitudinal direction L running onto the cutting blade in the area of the edge strip, accumulating there and being forcibly fed to the removal device. It has been shown, disadvantageously, that the leading separating device can negatively influence the transverse cutting of the edge strip via the cutting blade. In addition, there is the risk that the material web will jam in an uncontrolled manner on the cutting blade and, in special situations, the edge strip will not be reliably discharged via the discharge device. Another disadvantage is that in the removal process the strips are not separated from the web after the longitudinal cut, which creates edge effects. Another device and a corresponding method are used in the DE 10 2007 042 025 A1 discloses, this apparatus and this method are considered to be the closest prior art.

The object of the present invention is to provide a device and a method which enable the material web to be transversely severed simply, reliably and safely even at high web speeds.

The object of the present invention is achieved by all of the features of claim 1. Advantageous configurations and developments of the invention are the subject matter of the dependent claims.

In the context of the invention, transverse severing or transverse severing is understood to mean severing the remaining web (edge strip) transversely to the longitudinal direction of the fed material web.

The essence of the invention is that the removal device is suitable - without external assistance - to remove the remaining web after the transverse cutting. In contrast to the prior art mentioned, in which according to the DE 20 2011 004 608 U1 an external separating device integrated on the cross cutting knife detects the remaining web and directs it into the removal device, according to the invention only the removal device ensures automatic drawing in and removal of the remaining web. For example, it is conceivable that such a negative pressure prevails in the discharge device, so that the remaining web is automatically sucked into the discharge device after the transverse separation. In addition, the present invention has the advantage that a large number of partial webs can be produced and the removal device can simultaneously remove several remaining webs that arise when the material web is trimmed.

An essential advantage of the invention is that the remaining web is separated from the partial web well before the cross-cutting device. This means that after a transverse separation, the remaining web is separated from the partial web well in front of the cross-cutting device, so that the edges of the remaining web are prevented from contacting the edge of the partial web and thus negative edge effects or edge defects arise.

It can advantageously be provided that the discharge device has several discharge channels in order to suck away several residual webs, in particular that the position of the discharge channels in relation to the material web can be changed. The removal device advantageously has a pressure medium which creates a desired negative pressure in order to reliably suck off the remaining webs. The pressure medium can, for example, be a fan that works centrally for each discharge channel. It can also be provided that each discharge channel has an individual pressure medium.

It is particularly advantageous that the position of the discharge channels can be changed individually with respect to one another, which depends on the position of the longitudinal cut on the material.

The discharge channels can be displaced manually or automatically via actuators, so that full automation of the device according to the invention is conceivable.

In a further measure improving the invention, the discharge device can have at least one funnel which is designed with an inlet in order to discharge the remaining web. Each discharge channel advantageously has an individual funnel in order to discharge the remaining web at its inlet. A corresponding negative pressure is set in the funnel during the automatic trimming of the material web, whereby the remaining web is automatically sucked through the inlet of the funnel. In the context of the invention, the term "funnel" is to be understood as a component that does not necessarily have a changing cross section. For example, it is conceivable that the funnel has a constant cross-section or varying cross-sections. In the context of the invention, the term "funnel" can be equated with the term "nozzle".

In addition, it can be advantageous that the discharge device can be positioned on a first roller, which ensures the transport of the material web, in particular the geometry of the funnel in the area of the inlet being at least partially adapted to the geometry of the first roller. The first roller can, for example, further transport the partial web or partial webs, with a corresponding deflection of the transport direction of the partial web or partial webs taking place on the first roller, for example. The longitudinal cutting device is advantageously located upstream of the first roller, the transverse cutting device being located downstream of the first roller. So that the remaining web is reliably removed from the removal device, the removal device is located as close as possible to the first roller. An air flow from the outside through the inlet takes place via the negative pressure that occurs inside the funnel, whereby according to the invention a favorable air flow is created at the inlet, which reliably guides the remaining web into the funnel. The first roller preferably has a cylindrical shape and rotates about an axis, the geometry of the funnel in the area of the inlet being designed like a segment of a circle. The funnel can thus be guided as close as possible to the first roller, whereby a corresponding negative pressure is established within the funnel, which makes it possible to automatically pull the remaining web into the removal device after the transverse separation.

In addition, the invention can provide that a feed roller is arranged inside the funnel in order to remove the remaining web in an improved manner. The feed roller, which is also mounted about an axis of rotation, is advantageously located inside the funnel and captures the remaining web after a transverse separation has taken place outside the discharge device. The rotation of the feed roller results in active conveyance or active transport of the remaining web in the direction of the discharge channel, with the pressure medium of the discharge device advantageously also providing a corresponding negative pressure within the respective funnel. The rotation of the feed roller results in an even tension in the remaining web and reliable separation of the remaining web from the partial web. It can advantageously be achieved in this way that negative edge effects on the partial web and / or on the remaining web as well as the undercutting of the partial web by the remaining web is avoided.

Advantageously, the feed roller can extend through a large number of hoppers arranged adjacent to one another, each hopper in particular having an opening. Additionally and / or alternatively, the funnel with its funnel housing ensures a continuous increase in the flow velocity of the air, with air turbulence being reduced at the same time. For this purpose it can be advantageous for the funnel housing to have a funnel-like geometry, in particular to narrow in its cross section.

A measure improving the invention can provide that the feed roll is rotatably arranged inside the funnel in such a way that a first air flow flowing below the draw roll forms a second air flow flowing above the draw roll. It is conceivable that the feed roller is arranged inside the funnel in such a way that the first air flow reliably pulls the remaining web into the funnel from the outside. The second air flow, which flows above the feed roller, causes the remaining web to be reliably detached from the rotating feed roller. The first air flow can also have the function of reliably pressing the remaining web against the feed roller so that satisfactory transport of the remaining web through the removal device is ensured. According to one aspect of the invention, the volume flow of the first air flow can be greater than the second air flow which flows above the draw roll.

Furthermore, it can be advantageous for at least one closing element to be provided which can be brought between a closed position and an open position, an opening of the funnel being closed in the closed position and the opening of the funnel being opened in the open position. The underpressure within the funnel can be increased via the closing element in the closed position, with an interruption in the tension in the material web during transverse cutting being reduced at the same time. This means that the closing element is advantageously in the closed position during transverse cutting. If the start of the remaining web is inside the removal device and is reliably removed there, in particular by the feed roller, the closing element can be moved into the open position in order to bring about an additional air flow into the interior of the funnel. In this way, the power of the pressure medium can advantageously be reduced during operation in order to generate the same volume flow.

In addition, the invention comprises that the cross-cutting device is arranged in the area of the inlet, in particular downstream of the first roller. Via the negative pressure inside the funnel, the remaining web is pressed against the cross-cutting device and finally separated from it there so that the beginning of the remaining web is automatically sucked into the funnel and is accordingly captured by the air flow.

In a further measure improving the invention, the discharge device can have at least one auxiliary roller that can be brought between two positions, the auxiliary roller acting on the first roller in the first position and the auxiliary roller being spaced from the first roller in the second position. The auxiliary roller is preferably in the first position so that no material web tension drops, cut interruptions, web breaks, etc. occur during transverse cutting. If transverse cutting takes place, there is no interruption in the tension in the material web, which would be disadvantageous, in particular in the area of the longitudinal cutting device. The auxiliary roller is advantageously activated via a control unit; in particular, sensors can be provided which recognize the extent to which a transverse separation has already taken place, or the remaining web is already reliably in the discharge device, etc. For example, it is conceivable that a drive can insert the auxiliary roller into its respective position offset, in particular the drive can be a pneumatic drive. Alternatively and / or additionally this can Closing element have a separate drive, a pneumatic drive also being conceivable here.

The auxiliary roller can preferably be rotatably mounted on the funnel. In addition, the invention can also include the fact that the auxiliary roller is rotatably mounted on a housing element, the housing element in particular having the closing element. It can also be provided that the auxiliary roller is moved linearly between the named positions. A combination of rotation and linear guidance of the auxiliary roller in order to bring it between the two named positions is also conceivable within the subject matter of the invention. In addition, it is conceivable that the closing element and the auxiliary roller can be combined, so that only one actuator is required for moving into the suitable position. The housing element can be arranged rotatably and / or movably in the device according to the invention, in order in particular to move the auxiliary roller and / or the closing element into the desired position.

Furthermore, the invention can be developed in such a way that the inlet of the funnel in the direction of the cross-cutting device has an enlarged area which is free from the first roller. A free space is formed through the enlarged area of the inlet, through which air flow from the outside can reliably reach the funnel without the first roller obstructing the air flow. The enlarged area has shown itself to be particularly advantageous within the scope of the invention, since the residual web is automatically removed via the removal device after the transverse separation. A large air flow comes from the outside through the enlarged area, with the air flow at the same time reliably detecting the cross-cut remaining web.

The discharge device advantageously has a suction space into which the discharge channels open. In the suction area, the remaining webs can be passed on accordingly, in particular distributed, in order, for example, to enable processing or recycling of the remaining web and / or to enable targeted disposal of the remaining web.

In a further embodiment of the invention, the feed roller can extend at least partially out of the funnel, with one in particular extending inside the funnel Adjusts the flow that flows below the feed roller. For example, the hopper housing can be designed in such a way that the feed roller at least partially extends out of the hopper. In such an embodiment it can be conceivable that only one flow is established within the funnel, which flows, for example, below the feed roller and has the function of the first air flow. An advantage of this embodiment is that the feed roller and / or the funnel can be installed and / or replaced more easily.

The cross cutting device can have a cutting blade which can be serrated. It is also conceivable that the cross-cutting device can be moved and / or removed independently of the discharge device on the material web. The invention also includes that the discharge device including the cross-cutting device can be moved from a remote position to the material web, which corresponds for example to a continuous operating position, to a position closer to the material web, which represents the cutting position in which the cross-cutting device cuts through the remaining web. After the cross-cutting of the remaining web has been effected in this way and the remaining web has been grasped by the discharge device, a more distant position to the material web can be assumed again, so that the risk of injury to an operator by the cross-cutting device is minimized. Alternatively, it can also be provided that the cross-cutting device is arranged so that it can be extended on the discharge device, in particular on the funnel.

According to the present invention, the web of material can be a plastic film or a web of paper, textile, fleece, aluminum foil, copper foil or the like.

The longitudinal cutting device can advantageously have natural knife elements, cutting elements or wedges in order to be able to carry out a corresponding longitudinal cut in the longitudinal direction. However, it is also possible to make the longitudinal section through a jet of a medium such as water. A welding device such as a laser can also be used as a cutting device. Compared to the longitudinal cutting devices with knives or wedges, these cutting means have the advantage of not wearing out. However, they have the disadvantage of high media or energy consumption. The longitudinal cut is also conceivable with two scissor rollers running against one another.

Advantageously, the cross-cutting device, which is mounted further downstream than the longitudinal cutting device, can be provided with a control unit. This control unit can calculate the time difference in which the cross-cutting device enters the material web. One advantage of the automatically working cross-cutting device is that the cross-section for separating the remaining web from the material web no longer has to be made manually, which is too complicated during machine operation and therefore causes machine downtimes.

Advantageously, the funnel and / or the feed roller can be arranged in relation to the longitudinal cutting device in such a way that the remaining web is separated from the partial web starting at the longitudinal cutting device. The invention includes that the feed roller can be arranged in the overall arrangement in such a way that the separation from the longitudinal cutting device results from the position of the feed roller and / or the first roller and / or the second roller.

In addition, the above-mentioned object is achieved by a method according to all of the features of claim 11. It is particularly advantageous that the discharge device ensures that the transversely separated residual web reliably reaches the funnel from the outside. All the advantages of the device according to the invention can also be related to the method according to the invention.

The transverse severing of the remaining web can advantageously take place with a time delay to a longitudinal severing of the longitudinal cutting device. A control unit can be used for this, which activates the longitudinal cutting device and / or the transverse cutting device accordingly.

A particularly advantageous embodiment of the invention is that the pressure inside the funnel is set by a closing element that can be brought between a closed position and an open position, with an opening of the funnel being closed in the closed position and the opening of the funnel being opened in the open position is. Advantageously, the closing element can assume the closed position before the transverse severing of the remaining web, in particular if the discharge device reliably the Remaining web discharges, the closing element is moved into the open position. Thus, before the transverse cutting, a corresponding negative pressure is created inside the funnel, as a result of which during the transverse cutting it is achieved that the transversely separated residual web reliably arrives in the funnel. If the remaining web is reliably removed after a certain time, the closing element can be moved into the open position, which creates an additional air inlet that can, for example, cause the remaining web to reliably separate from the feed roller or not adhere to it.

An auxiliary roller can advantageously bear against the first roller when the transverse severing takes place, in order to prevent an interruption in the tension in the material web. Said auxiliary roller can advantageously be brought between two positions, the auxiliary roller acting on the first roller in the first position and the auxiliary roller being spaced apart from the first roller in the second position. When the auxiliary roller is in the second position, there is an even pull in the remaining web and reliable separation from the remaining web to the partial web.

Advantageously, a feed roller that reliably removes the remaining web can be arranged within the funnel. The feed roller promotes the removal of the remaining web within the discharge device and a reliable separation, whereby a uniform pull is effected in the remaining web.

The method advantageously enables a large number of remaining webs that are parallel to one another to be removed at the same time. For this purpose, several funnels are provided within the discharge device, the remaining webs which are located downstream of the funnels being passed through discharge channels.

It can particularly preferably be provided that the remaining web is separated from the partial web far in front of the cross-cutting device, in particular that the remaining web is separated from the partial web in front of the removal device. The immediate separation of the remaining web from the partial web has the advantage that the remaining web with the partial web cannot hit against each other after a transverse separation has taken place. Edge defects on the partial web can thus be effectively prevented.

In addition, it can be provided that the funnel and / or the feed roller are arranged in relation to the longitudinal cutting device in such a way that after the transverse severing from the longitudinal cutting device, the remaining web is separated from the partial web.

Advantageously, all of the features of the device claims can be combined with all of the features of the method claims.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Vorrichtung zum automatischen Schneiden einer Materialbahn,

Fig. 2 a, b

eine mögliche Ausführungsform der erfindungsgemäßen Vorrichtung gemäß Fig. 1,

Fig. 3

eine weitere Ausführungsvariante der Vorrichtung gemäß Fig. 1,

Fig. 4

ein noch weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung gemäß Fig. 1 und

Fig. 5

eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung gemäß Fig. 1.

Further advantages, features and details of the invention emerge from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. Show it:

Fig. 1

a side view of a device according to the invention for automatically cutting a material web,

Fig. 2 a, b

a possible embodiment of the device according to the invention according to Fig. 1 ,

Fig. 3

another embodiment of the device according to Fig. 1 ,

Fig. 4

yet another embodiment of a device according to the invention according to Fig. 1 and

Fig. 5

according to another embodiment of the device according to the invention Fig. 1 .

In Fig. 1 a possible embodiment of a device 1 for automatically cutting a material web 2 is shown. The material web 2 is simplified in the Figs. 2 to 5 shown, which is trimmed via a longitudinal cutting device 60 and a transverse cutting device 70, which will be discussed below. The device 1 has a discharge device 10 which has several discharge channels 11, each discharge channel 11 opening into a suction chamber 26. At the suction space 26 A funnel 12 is provided at the opposite end of the discharge channel 11 and has an inlet 13 as an opening.

In addition, a first roller 31 is shown, which is arranged at a distance from a second roller 32. The material web 2 is guided and moved in the longitudinal direction L over the second roller 32 in the direction of the first roller 31. Between the two rollers 31, 32 there is a longitudinal cutting device 60 which continuously cuts the material web 2 in the longitudinal direction L into at least one partial web 3 and a residual web 4. In the present exemplary embodiments, the material web 1 is severed at several points, so that a large number of partial webs 3 and residual webs 4 are produced. The material web 2 can be, for example, a plastic film web, which is continuously produced, for example, as a blown or flat film and is fed to the device 1 according to the invention in a longitudinal direction L.

For example, the longitudinal cutting device 60 can have knife elements in order to effect the longitudinal separation just described on the material web 2.

In order to reliably remove the remaining web 4 and separate it from the partial web 3, a cross-cutting device 70 is provided downstream of the longitudinal cutting device 60, which penetrates in the area of the remaining web 4 with a cutting element not explicitly shown. This results in a cut on the remaining web 4 transversely to the longitudinal direction L. The fan 50 generates a corresponding negative pressure in the discharge device 10, in particular in the funnel 12, so that after the transverse separation, the air flow 5 acting from the outside automatically guides the remaining web 4 into the funnel 12 . The funnel 12 is positioned as close as possible to the first roller 31 in order to reliably suck the remaining web 4 into the funnel 12. It is particularly advantageous that in all the exemplary embodiments the geometry of the funnel 12 in the area of the inlet 13 through which the remaining web 4 is sucked into the funnel 12 is at least partially adapted to the geometry of the first roller 31. This makes it possible to achieve favorable pressure conditions within the funnel 12, at the same time ensuring that the cross-cut residual web 4 reliably reaches the funnel 12.

As shown in all of the exemplary embodiments, the device 1 has a schematically illustrated closing element 14 which can be moved between a closed position 21 and an open position 22. The open position 22 is only in Figure 2b and 5 shown, wherein the closing element 14 can also be transferred into such positions 21, 22 according to all the figures. In particular, in the Figs. 2 to 4 the closing element 14 is shown in the closed position 21. The funnel 12 has an opening 19 which can be closed or opened by the closing element 14.

The discharge device 10 has according to Fig. 2 an auxiliary roller 15 which is displaceable and / or pivotable between two positions 23, 24, wherein in the first position 23 the auxiliary roller 15 rests against the first roller 31, and in the second position 24 the auxiliary roller 15 is spaced from the first roller 31 . Before the transverse cutting takes place via the transverse cutting device 70, a longitudinal cut is first made via the longitudinal cutting device 60, the auxiliary roller 15 acting on the first roller 31, which in FIG Fig. 2a is shown. The advantage is that when the auxiliary roller 15 rests against the first roller 31, an interruption in the tension in the material web 2, in particular in the area of the longitudinal cutting device 60, is prevented. After the transverse cutting, the discharge device 10 ensures that the residual web 4 is reliably sucked into the funnel 12. If the remaining web 4 is reliably removed in the removal device 10, the auxiliary roller 15 moves from the first position 23 ( Fig. 2a ) to the second position 24 ( Figure 2b ).

According to Figs. 2 to 4 the device 1 according to the invention has a feed roller 16 which is arranged inside the respective funnel 12. As in Fig. 1 As shown, the feed roller 16 penetrates all of the hoppers 12 arranged adjacent to one another, the feed roller 16 rotating about the axis 80 while the device 1 is in operation. The feed roller 16 rotates clockwise and causes an improved removal of the remaining web 4 in the direction of the discharge channel 11, in particular in the direction of the suction chamber 26. Here, a first air flow 17 is formed, which flows below the feed roller 16, and a second air flow 18, which flows above the feed roller 16 flows. The first air flow 17 favors that the remaining web 4 is reliably guided to the feed roller 16 and then the remaining web 4 is reliably transported in the direction of the discharge channel 11. There is a uniform tensile stress on the material web 2, whereby a reliable separation of the remaining web 4 from the partial web 3 in the area of Slitting device 60 takes place when the auxiliary roller 15 is in its second position 24 according to FIG Figure 2b is and the closing element 14 is in the open position 22, which is only in Figure 5 is shown.

The second air flow 18, which flows above the feed roller 16, causes the remaining web 4 to reliably detach itself from the feed roller 16 and thus no adhesion effects of the remaining web 4 to the feed roller 16 arise.

In one possible embodiment of the invention, which is shown schematically in Fig. 2 is shown, the auxiliary roller 15 is rotatably arranged on the hopper 12. Here, the auxiliary roller 15 is arranged on a housing element 20 which can be pivoted about an axis 81. The auxiliary roller 15 can simultaneously be rotated about the axis 84. The movement of the housing element 20 can take place via a drive, in particular an electric or pneumatic drive, which is not explicitly shown. It is also conceivable that the auxiliary roller 15 can be moved linearly between its two positions 23, 24.

In addition, according to Fig. 2a and 2 B be included that the closing element 14 is arranged on the auxiliary roller 15, in particular on the housing element 20, or is integrated. When the auxiliary roller 15 is moved between its two positions 23, 24, the closing element 14 is simultaneously moved into its closed position 21 or into the open position 22. Preferably, the auxiliary roller 15 is in operative connection with the closing element 14.

If the remaining web 4 or the remaining webs 4 are reliably removed via the removal device 10, the closing element 14 opens, whereby additional ambient air can penetrate through the opening 19 into the funnel 12, which is also the case for the exemplary embodiments according to FIG FIGS. 3 to 5 applies.

So that the remaining web 4 is reliably sucked into the funnel 12 after the transverse cutting, the inlet 13 of the funnel 12 has an enlarged area 25 in the direction of the transverse cutting device 70, which is free of the first roller 31. The enlarged area 25 favors that a large air flow 5 from the surroundings within the Funnel housing 27 can penetrate, which can simultaneously push the transversely separated residual web 4 into the funnel 12.

The embodiment according to Fig. 3 shows that it works without the auxiliary roller 15 Fig. 2 can get by, with all the features from Fig. 2a and Figure 2b also in the embodiment of Fig. 3 are included. As Fig. 3 corresponds Fig. 4 essentially according to the embodiment Fig. 2 , the hopper housing 27 being designed differently, so that the feed roller 16 extends at least partially out of the hopper 12. According to Fig. 4 there is only a first air flow 17 which flows below the feed roller 16. The embodiment according to. Fig. 4 knows how Fig. 3 no feed roller 16, and it is also conceivable that the embodiment according to Fig. 4 with the feed roller 16 according to Fig. 2a and Figure 2b to combine.

The embodiment according to Fig. 5 corresponds essentially to the embodiment according to Fig. 2a and Figure 2b , the embodiment according to Fig. 5 without a feed roller 16 and without an auxiliary roller 15. The other features of the embodiment according to Fig. 5 correspond to the explanations from the previously described FIGS. 2 to 4 .

In all of the exemplary embodiments, the cross-cutting of the remaining web 4 takes place with a time delay to a longitudinal cutting of the longitudinal cutting device 60. The pressure within the funnel 12 can be adjusted, among other things, by the closing element 14, which can be moved between the closed position 21 and the open position 22. Before the residual web 4 is severed transversely, the closing element 14 assumes the closed position 21. If, after a defined time, the remaining web 4 is reliably discharged via the discharge device 10, the closing element 14 is transferred into the open position 22, whereby a supporting compensating air flow flows into the funnel 12 via the opening 19. This equalizing air flow can, inter alia, cause it to merge into the second air flow 18 or trigger improved flow effects within the funnel 12.

According to Fig. 1 , which with all embodiments according to FIGS. 2 to 5 can be combined, the discharge channels 11 are mutually displaceable in the longitudinal direction of the axis of rotation of the first roller 31, so that the distance between the Discharge channels 11 is adjustable. The material web 2, which is transported over the rollers 31, 32, can be cut in the most varied of ways, with residual webs 4 formed at the edge of the material web 2, which can also be referred to as edge strips. As in Fig. 1 As shown, the funnels 12 are designed to be widened, in particular on the left and right, in order to be able to suck off wider residual webs 4. In the center of the widened funnels 12, narrower funnels 12 are provided in order to suck off residual webs 4 which are narrower. These narrower remaining webs 4 can also be referred to as median strips.

It is also conceivable that the suction space 26 can accommodate all of the edge strips and median strips in order to feed them back into the overall process or to pass these remaining webs on for disposal. Likewise, within the scope of the inventive concept according to Fig. 1 It can be provided that the suction space 26 has several separate cavities, for example the widened discharge channels 11, which are arranged on the left and right, open into a first cavity, and the narrower discharge channels 11 open into a separate second cavity. The operator of the device 1 according to the invention is thus free to “further process” the remaining webs 4 within the separate cavities of the suction space 26 according to the corresponding requirements. This means that certain residual webs should be fed back into the overall process, for example, or certain residual webs should be disposed of. According to Fig. 1 each funnel 12 has an opening 28 through which the feed roller 16 extends, the geometry of the opening 28 essentially corresponding to the geometry of the feed roller 16.

List of reference symbols

1

contraption

2

Material web

3

Partial track

4th

Remaining track

5

Air flow

10

Discharge device

11

Drainage channel

12

funnel

13

inlet

14th

Closing element

15th

Auxiliary roller

16

Feed roll

17th

first air flow

18th

second air flow

19th

opening

20th

Housing element

21st

Closed position

22nd

Open position

23

first position

24

second position

25th

enlarged area

26th

Suction room

27

Funnel housing,

28

breakthrough

31

first roller

32

second roller

50

Pressure medium, blower

60

Slitter

70

Cross cutting device

80

axis

81

axis

82-84

axis

Claims (15)

1. A device (1) for the automatic cutting of a material web (2), having a longitudinal cutting device (60), by means of which the material web (2) can be severed in a longitudinal direction L into at least a partial web (3) and/or at least a residual web (4), a discharge device (10) for the automatic discharge of the residual web (4) produced, a transverse cutting device (70) downstream of the longitudinal cutting device (60) for severing the residual web (4) transversely to the longitudinal direction L, wherein the discharge device (10) can be positioned on a first roller (31), which provides for a transport of the material web (2), and the discharge device (10) has at least one auxiliary roller (15),
   characterized in
   that the auxiliary roller (15) can be brought between two positions (23, 24),
   and that in the first position (23) the auxiliary roller (15) acts on the first roller (31) and in the second position (24) the auxiliary roller (15) is spaced apart from the first roller (31).
2. The device (1) according to claim 1,
   characterized in
   that a separating of the residual web (4) from the partial web (3) occurs well in advance of the transverse cutting device (70) and/or that the discharge device (10) has several discharge channels (11), in order to suck off several residual webs (4), in particular, that the discharge channels (11) can be changed in their position relative to the material web (2).
3. The device (1) according to any one of the preceding claims,
   characterized in
   that the discharge device (10) has at least one hopper (12), which is formed with an inlet (13), in order to discharge the residual web (4), wherein, in particular, the geometry of the hopper (12) is adapted in the area of the inlet (13) at least partially to the geometry of the first roller (31).
4. The device (1) according to any one of the preceding claims,
   characterized in
   that a feed roller (16) is arranged within the hopper (12), in order to discharge the residual web (4) in an improved manner, in particular, that the feed roller (16) is rotatably arranged within the hopper (12) in such a manner that a first air flow (17), which flows beneath the feed roller (16), and a second air flow (18), which flows above the feed roller (16), are formed.
5. The device (1) according to any one of the preceding claims,
   characterized in
   that at least one closing element (14) is provided, which can be brought between a closed position (21) and an open position (22), wherein in the closed position (21) an opening (19) of the hopper (12) is closed and in the open position (22) the opening (19) of the hopper (12) is opened.
6. The device (1) according to any one of the preceding claims,
   characterized in
   that in the area of the inlet (13), in particular, downstream of the first roller (31) the transverse cutting device (70) is arranged.
7. The device (1) according to any one of the preceding claims,
   characterized in
   that the auxiliary roller (15) is rotatably and/or displaceably mounted on the hopper (12) and/or that the auxiliary roller (15) is rotatably mounted on a housing element (20), wherein, in particular, the housing element (20) has the closing element (14).
8. The device (1) according to any one of the preceding claims,
   characterized in
   that the inlet (13) of the hopper (12) in the direction of the transverse cutting device (70) has an enlarged area (25), which is free of the first roller (31), and/or that the discharge device (10) has a suction chamber (26), into which the discharge channels (11) open.
9. The device (1) according to any one of the preceding claims,
   characterized in
   that the feed roller (16) extends at least partially out of the hopper (12), wherein, in particular, a flow (17) arises within the hopper (12), which flows beneath the feed roller (16), and/or that the feed roller (16) extends through a plurality of hoppers (12) arranged adjacent to one another, wherein, in particular, each hopper (12) has an opening (28).
10. The device (1) according to any one of the preceding claims,
    characterized in
    that the hopper (12) and/or the feed roller (16) are arranged relative to the longitudinal cutting device (60) in such a manner that starting from the longitudinal cutting device (60) the residual web (4) is separated from the partial web (3).
11. A method, in particular, for operating a device (1) according to any one of claims 1 to 10, for the automatic cutting of a material web (2), having a discharge device (10), which is positioned on a first roller (31) transporting the material web (2), having a longitudinal cutting device (60) upstream of the first roller (31), by means of which the material web (2) is severed in a longitudinal direction L into at least one partial web (3) and at least one residual web (4), having a transverse cutting device (70) downstream of the longitudinal cutting device (60), which transverse cutting device severs the residual web (4) transversely to the longitudinal direction L, wherein
    the discharge device (10) has a hopper (12) with in each case an inlet (13) facing the first roller (31), through which inlet the residual web (4) enters the discharge device (10),

    the inlet (13) of the hopper (12) has an enlarged area (25), which is free of the first roller (31), so that a pressure situation arises within the hopper (12), whereby after a transverse cutting of the residual web (4) by the transverse cutting device (70) an automatic discharge of the residual web (4) into the discharge device (10) is carried out,

    characterized in that

    an auxiliary roller (15) rests against the first roller (31), if the transverse cutting is performed, in order to prevent a traction interruption in the material web (2).
12. The method according to claim 11,
    characterized in
    that the transverse cutting of the residual web (4) occurs with a time delay with respect to a longitudinal cutting of the longitudinal cutting device (60) and/or that the pressure (50) within the hopper (12) is set by a closing element (14), which, in particular, can be brought between a closed position (21) and an open position (22), wherein in the closed position (21) an opening (19) of the hopper (12) is closed and in the open position (22) the opening (19) of the hopper (12) is opened.
13. The method according to any one of claims 11 or 12,
    characterized in
    that before the transverse cutting of the residual web (4) the closing element (14) assumes the closed position (21), in particular, if the discharge device (10) reliably discharges the residual web (4), the closing element (14) is moved into the open position (22).
14. The method according to any one of claims 11 to 13,
    characterized in
    that within the hopper (12) a feed roller (16) is arranged, which reliably discharges the residual web (4).
15. The method according to any one of claims 11 to 14,
    characterized in
    that the hopper (12) and/or the feed roller (16) are arranged relative to the longitudinal cutting device (60) in such a manner that after the transverse cutting starting from the longitudinal cutting device (60) the residual web (4) is separated from the partial web (3), and/or that a separation of the residual web (4) from the partial web (3) occurs far in advance of the transverse cutting device (70), in particular, the separation of the residual web (4) from the partial web (3) occurs before the discharge device (10).

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