EP3083463B1 - Apparatus for automatically cutting and discharging a web of material, and associated method - Google Patents

Description

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

It has been found that in more advanced production equipment for the production of the just-mentioned material webs, such as plastic films, it is known not only to suck off or dissipate the generated edge strips, but to wind these edge strips at least for an orderly disposal or recycling or immediately inline one To recycle.

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

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 into an edge strip. The longitudinal cutting blade produces an incision which at the same time forms the boundary between the partial web and the edge strip. The cross-cutting of the material web, in particular of the edge strip, is effected by a cross-cutting knife, which has a cutting blade and a separating device, which causes a separation of the edge strip from the part web before the cross-cutting of the edge strip. As the cross-cutting blade continues to approach the material web, the cutting blade finally cuts through the edge strip, wherein the material web fed further in the longitudinal direction L runs onto the cutting blade in the region of the edge strip, jams there and is forcibly fed to the removal device. It has disadvantageously been shown that the leading separating device can negatively influence the cross cutting of the edge strip over the cutting blade. In addition, there is a risk that an uncontrolled jamming of the material web is formed on the cutting blade, and in special situations it does not come to the reliable removal of the edge strip on the discharge device. Another disadvantage is that in the removal process, the strips are not separated from the web after the longitudinal section, whereby edge effects occur.

The DE 10 2005 000 190 A1 discloses a device for cutting a material web with a longitudinal cutting device and a discharge device for discharging an edge strip of the material web.

The DE 10 2007 042 025 A1 discloses another device for cutting a web of material.

The object of the present invention is to provide a device and a method which enables a simple, reliable and secure cross-separation of the material web even at high web speeds.

The object of the present invention is achieved by all features of claim 1 or 3. Advantageous embodiments and modifications of the invention are the subject of the dependent claims.

For the purposes of the invention, cross-cutting or cross-cutting is understood to mean a severing of the residual web (edge strip) transversely to the longitudinal direction of the fed material web.

The essence of the invention is that the discharge device is suitable - without external assistance - to dissipate the residual web after cross-cutting. In contrast to the cited prior art, in which according to the DE 20 2011 004 608 U1 An external separating device integrated on the cross-cutting blade detects the residual web and directs it into the discharge device, according to the invention provides exclusively the discharge device for an automatic retraction and removal of the residual web. For example, it is conceivable that such a negative pressure prevails in the discharge device, so that automatically after the cross cutting the residual web is sucked into the discharge device. In addition, the present invention has the advantage that a plurality of partial webs can be produced and the discharge device can dissipate several residual webs simultaneously, which are formed when trimming the material web.

An essential advantage of the invention is that a separation of the residual web from the partial web takes place well in front of the cross-cutting device. This means that after a cross-cutting the residual web is separated from the part track far in front of the cross-cutting device, so that it is avoided that the edges of the residual web contact the edge of the part web and thus negative edge effects or edge defects occur.

Advantageously, it may be provided that the discharge device has a plurality of discharge channels in order to suck off a plurality of residual webs, in particular that the discharge channels can be changed in their position relative to the material web. Advantageously, the discharge device to a pressure medium, which produce a desired negative pressure leaves to reliably suck the residual webs. The pressure means may be, for example, a fan which 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 discharge channels are individually variable in their position to each other, which depends on the position of the longitudinal section of the material. The displacement of the discharge channels can be done manually or automatically via actuators, so that a full automation of the device according to the invention is conceivable.

According to the invention, the discharge device has at least one funnel, which is formed with an inlet in order to remove the residual web. Advantageously, each discharge channel has an individual funnel in order to discharge the residual web at its inlet. In the hopper, a corresponding negative pressure sets during the automatic trimming of the web, whereby the residual web is automatically sucked through the inlet of the hopper. In the context of the invention, the term "funnel" is to be understood as a component which does not necessarily have a changing cross section. Ex. Is it conceivable that the funnel has a constant cross section or varying cross sections. The term "funnel" can be equated within the scope of the invention with the term "nozzle".

In addition, it may be advantageous that the removal device can be positioned on a first roller, which ensures transport of the material web, wherein in particular the geometry of the funnel in the region of the inlet is at least partially adapted to the geometry of the first roller. The first roller can, for example, continue to transport the partial web or partial webs, wherein, for example, a corresponding deflection of the transport direction of the partial web or partial webs takes place on the first roller. Advantageously, the slitter is upstream of the first roller, wherein the cross-cutting device is downstream of the first roller. So that the residual web is reliably removed from the discharge device, the discharge device is as close as possible to the first roller. About the resulting negative pressure within the funnel, an air flow from the outside through the inlet, wherein according to the invention a favorable air flow at the inlet is formed, which reliably leads the residual web into the hopper. Preferably, the first roller has a cylindrical shape and rotates about one Axis, wherein the geometry of the funnel is designed in the region of the inlet of a circular segment. Thus, the hopper can be guided as close to the first roller, whereby a corresponding negative pressure within the hopper is established, which manages to automatically pull the residual web into the discharge device after the cross-cutting.

In addition, the invention provides that within the funnel a preferred roller is arranged to dissipate the residual web improved. Advantageously, the preferred roller, which is likewise mounted about an axis of rotation, within the funnel and detects the residual web, after a transverse separation has taken place outside the discharge device. By the rotation of the preferred roller takes place an active promotion or an active transport of the residual web in the direction of the discharge channel, wherein via the pressure medium of the discharge advantageously a corresponding negative pressure within the respective funnel is provided. About the rotation of the preferred roller results in a uniform train in the residual web and a reliable separation of the residual web of the partial web. Advantageously, it can thereby be achieved that negative edge effects on the partial web and / or on the residual web as well as the underflow of the partial web through the residual web is avoided.

Advantageously, the preferred roller can extend through a multiplicity of hoppers arranged adjacent to one another, wherein in particular each hopper has an opening. Additionally and / or alternatively, the funnel with its funnel housing ensures a continuous increase in the flow rate of the air, at the same time reducing air turbulence. For this purpose, it may be advantageous that the funnel housing has a funnel-like geometry, in particular narrows in its cross section.

A measure improving the invention can provide that the preferred roller is rotatably arranged inside the funnel such that a first air flow, which flows below the preferred roller, forms a second air flow, which flows above the preferred roller. In this case, it is conceivable that the preferred roller is arranged within the funnel such that the first air flow reliably pulls the residual web from the outside into the funnel. The second air flow, which flows above the feed roller, causes the residual web to reliably detach again from the rotating feed roller. The first Air flow can also have the function to reliably press the residual web to the preferred roller, so that a satisfactory transport of the residual web is ensured by the discharge device. The volumetric flow rate of the first airflow may, according to an aspect of the invention, be greater than the second airflow that flows above the preferredroller.

Furthermore, it may be advantageous that at least one closing element is provided, which can be brought between a closed position and an open position, wherein in the closed position, an opening of the funnel is closed and in the open position, the opening of the funnel is open. By means of the closure element located in the closed position, the negative pressure within the funnel can be increased, wherein a train interruption in the material web during cross-cutting is simultaneously reduced. This means that advantageously in cross-cutting the closing element is in the closed position. If the residual web start within the discharge device and is reliably dissipated there, in particular by the preferred roller, the closing element can be moved into the open position to effect an additional air flow into the interior of the funnel. As a result, the power of the pressure medium during operation can advantageously be reduced in order to produce the same volume flow.

In addition, the invention comprises that in the region of the inlet, in particular downstream of the first roller, the cross-cutting device is arranged. About the negative pressure within the hopper, the residual web is pressed to the cross-cutting device and finally separated from her there, so that the start of the residual web is automatically sucked into the hopper and is detected accordingly by the air flow.

In a further measure improving the invention, the discharge device may comprise at least one auxiliary roller which can be brought between two positions, wherein in the first position the auxiliary roller acts on the first roller and in the second position the auxiliary roller is spaced from the first roller. So that no web tension dips, interruptions cut, web breaks, etc. arise during cross cutting, the auxiliary roller is preferably in the first position. If a cross-cutting occurs, in particular in the area of the longitudinal cutting device no train interruption in the material web, which would be disadvantageous. Advantageously, the control of the Auxiliary roll via a control unit, in particular sensors may be provided which detect the extent to which a transverse separation has already occurred, or the residual web is already reliably located in the discharge device, etc. For example, it is conceivable that a drive offset the auxiliary roll in its respective position in particular, the drive may be a pneumatic drive. Alternatively and / or additionally, the closing element can have a separate drive, wherein here too a pneumatic drive is conceivable.

Preferably, the auxiliary roll can be rotatably mounted on the hopper. In addition, the invention may include that the auxiliary roll is rotatably mounted on a housing element, wherein in particular the housing element has the closing element. It can also be provided that the auxiliary roll is moved linearly between said positions. A combination of rotation and linear guide of the auxiliary roll to bring them between the two mentioned positions is also conceivable within the subject invention. In addition, it is conceivable that the closing element and the auxiliary roll may be combined, so that only one actuator is required for moving into the appropriate position. The housing element may be rotatable and / or movable in the device according to the invention, in particular to move the auxiliary roller and / or the closing element in 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 that is free of the first roller. A clearance is formed through the enlarged area of the inlet, through which reliable air flow can enter the hopper from outside, without the first roller hindering the flow of air. The enlarged area has been found to be particularly advantageous in the context of the invention, since an automatic removal of the residual web takes place after the cross-cutting via the discharge device. A large air flow passes from the outside through the enlarged area, wherein the air flow reliably detects the transverse separated residual web at the same time.

Advantageously, the discharge device has a suction space into which the discharge channels open. In the suction space, the residual webs can be forwarded accordingly, in particular distributed, for example, a processing or To enable recycling of the residual web and / or to enable a targeted disposal of the residual web.

In a further inventive idea, the preferred roller extends at least partially out of the funnel, wherein within the funnel a flow is established which flows below the preferred roller. For example, the funnel housing may be formed such that at least partially the preferred roller extends from the funnel. In such an embodiment, it may be conceivable that only a flow within the funnel sets, for example, flows below the preferred roller and has the function of the first air flow. An advantage of this embodiment is that the preferred roller and / or the funnel are easier to mount and / or replace.

The cross-cutting device may comprise a cutting blade, which may be formed jagged. It is also conceivable that the cross-cutting device is movable and / or removable independently of the discharge device to the material web. Likewise, the invention comprises that the removal device, including the cross-cutting device, is displaceable from a remote position to the material web, which corresponds, for example, to a continuous operating position, into a closer position to the material web, which represents the cutting position in which the cross-cutting device cuts through the residual web. After the cross-cutting of the residual web has been effected in this way, and the residual web has been detected by the discharge device, a more distant position can be taken again to the material web, so that the risk of injury to an operator is minimized by the cross-cutting device. Alternatively, it can also be provided that the cross-cutting device is arranged extendable on the discharge device, in particular on the hopper.

According to the present invention, the material web can be a plastic film or a web of paper, textile, fleece, aluminum foil, copper foil or the like. Advantageously, the longitudinal cutting device can 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 the longitudinal section through to make a jet of a medium like water. A welding agent, such as a laser, comes as a cutting tool in question. Compared with the slitting devices with knives or wedges, these cutting means have the advantage not to wear. However, they have the disadvantage of high media or energy consumption. The longitudinal section is also conceivable with two mutually running shear rollers.

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

Advantageously, the funnel and / or the preferred roller can be arranged in such a way to the longitudinal cutting device that, as of the longitudinal cutting device, the residual web is separated from the partial web. The invention includes that the feed roller may 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 object is achieved by a method according to all features of claim 16. It is particularly advantageous that the discharge device ensures that the cross-separated residual web reliably enters the funnel from the outside. All advantages of the device according to the invention can also relate to the inventive method.

Advantageously, the cross-cutting of the residual web can be carried out with a time delay to a longitudinal separation of the longitudinal cutting device. For this purpose, a control unit can be used, which activates the longitudinal cutting device and / or the cross-cutting device accordingly.

A particularly advantageous embodiment of the invention is that the pressure within the funnel is adjusted by a closing element, which can be brought in particular between a closed position and an open position, wherein in the closed position, an opening of the funnel is closed and opened in the open position, the opening of the funnel is. Advantageously, before the cross-cutting of the residual web, the closing element take the closed position, in particular when the discharge device reliably dissipates the residual web, the closing element is moved into the open position. Thus, a corresponding negative pressure within the funnel is created before the cross-cutting, which is achieved during cross-cutting, that reliably the cross-separated residual web enters the funnel. If after a certain time a reliable removal of the residual web, the closing element can be converted into the open position, whereby an additional air inlet is formed, which can cause, for example, that the residual web reliably separates again from the preferred roller or does not adhere to this.

Advantageously, an auxiliary roll may abut against the first roll when the cross-cutting takes place in order to prevent a break in the web of material. Said auxiliary roll can be advantageously brought between two positions, wherein in the first position, the auxiliary roller acts on the first roller and in the second position, the auxiliary roller is spaced from the first roller. When the auxiliary roll is in the second position, there is a uniform pull in the residual web and a reliable separation from the residual web to the partial web.

Advantageously, a preferred roller can be arranged within the hopper, which reliably dissipates the residual web. The preferred roller favors the removal of the residual web within the discharge device and a reliable separation, whereby a uniform train in the residual web is effected.

Advantageously, the method allows a plurality of residual webs, which are parallel to each other, to be removed simultaneously. For this purpose, a plurality of funnels are provided within the discharge device, wherein in discharge channels the residual webs are passed, which are downstream of the funnels.

Particularly preferably, it can be provided that the residual web is separated from the partial web far in front of the cross-cutting device, in particular the separation of the residual web from the partial web takes place before the removal device. The immediate separation of the residual web from the partial web has the advantage that the residual web with the partial web can not beat each other after a cross-cutting has occurred. Thus, edge defects on the partial web can be effectively prevented.

In addition, it can be provided that the hopper and / or the preferred roller are arranged in such a way to the longitudinal cutting device, that after the cross cutting from the longitudinal cutting device, the residual web is separated from the partial web.

Advantageously, all features of the device claims can be combined with all 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 nicht erfindungsgemäße Ausführungsform der Vorrichtung gemäß Fig. 1.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, embodiments of the invention are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired 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 Fig. 1 .

Fig. 3

a further embodiment of the device according to Fig. 1 .

Fig. 4

a still further embodiment of an inventive device according to Fig. 1 and

Fig. 5

a further non-inventive embodiment of the device according to 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 Fig. 2 to 5 shown, which is trimmed by a slitting device 60 and a cross-cutting device 70, which will be discussed below. The device 1 has a discharge device 10, which has a plurality of discharge channels 11, wherein each discharge channel 11 opens into an extraction space 26. At the end of the discharge channel 11 opposite the suction chamber 26, a funnel 12 is provided which 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 in the longitudinal direction L via the second roller 32 in the direction of the first roller 31 and moved. Between two rollers 31, 32 there is a longitudinal cutting device 60 which continuously cuts through the material web 2 in at least one partial web 3 and a residual web 4 in the longitudinal direction L. In the present exemplary embodiments, the material web 1 is severed at several points, so that a multiplicity of partial webs 3 and residual webs 4 are formed. The material web 2 may be, for example, a plastic film web which is continuously produced, for example, as a blown or flat film and fed in a longitudinal direction L of the device 1 according to the invention.

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

In order to dissipate the residual web 4 reliably and to separate it from the part web 3, a cross-cutting device 70 is provided downstream of the longitudinal cutting device 60, which penetrates in the region of the residual web 4 with a cutting element not explicitly shown. This results in a cut on the residual 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 hopper 12, so that after the cross-cutting automatically acting from the outside air flow 5, the residual web 4 into the hopper 12 , The hopper 12 is positioned as close to the first roller 31 as possible to reliably suck the residual web 4 into the hopper 12. It is particularly advantageous that in all Embodiments, the geometry of the funnel 12 in the region of the inlet 13 through which the residual web 4 is sucked into the hopper 12, at least partially adapted to the geometry of the first roller 31. In this way, favorable pressure conditions within the funnel 12 can be achieved, while at the same time ensuring that the transverse separated web 4 passes reliably into the funnel 12.

As shown in all embodiments, the device 1 has a schematically illustrated closing element 14, which is movable between a closed position 21 and an open position 22. The open position 22 is only in Fig. 2b and 5 shown, wherein the closure member 14 according to all figures also in such positions 21, 22 can be transferred. In particular, in the Fig. 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 slidable and / or pivotable between two positions 23, 24, wherein in the first position 23, the auxiliary roller 15 abuts the first roller 31, and in the second position 24, the auxiliary roller 15 spaced from the first roller 31 , Before the cross-cutting takes place via the cross-cutting device 70, a longitudinal cut first takes place via the longitudinal cutting device 60, the auxiliary roller 15 acting on the first roller 31, which acts in FIG Fig. 2a is shown. The advantage is that, when the auxiliary roller 15 abuts against the first roller 31, an interruption of the train in the material web 2, in particular in the region of the longitudinal cutting device 60, is prevented. The removal device 10 ensures, after the cross-cutting, that the residual web 4 is reliably sucked into the hopper 12. If a reliable removal of the residual web 4 in the discharge device 10, the auxiliary roller 15 moves from the first position 23 (FIG. Fig. 2a ) to the second position 24 ( Fig. 2b ).

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

The second air flow 18, which flows above the preferred roller 16, causes the residual web 4 to reliably detach from the preferred roller 16 again and thus no adhesion effects of the residual web 4 on the preferred roller 16 arise.

In a possible embodiment of the invention, which is schematically illustrated in FIG Fig. 2 is shown, the auxiliary roller 15 is rotatably mounted on the hopper 12. Here, the auxiliary roller 15 is arranged on a housing element 20 which is pivotable about an axis 81. The auxiliary roll 15 is simultaneously rotatable 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 explicitly not 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 with that the closing element 14 is arranged on the auxiliary roller 15, in particular on the housing element 20 or integrated with. Thus, when the auxiliary roller 15 is moved between its two positions 23, 24, there is simultaneously a co-movement of the closing element 14 in its closed position 21 or in the open position 22. Preferably, the auxiliary roller 15 is in operative connection with the closing element fourteenth

If the residual web 4 or the residual webs 4 are reliably removed via the discharge device 10, an opening process of the closing element 14 takes place, as a result of which additional ambient air can penetrate through the opening 19 into the funnel 12, which is also suitable for the embodiments according to FIGS FIG. 3 to FIG. 5 true.

So that the residual web 4 is reliably sucked into the hopper 12 after the cross-cutting, the inlet 13 of the hopper 12 in the direction of the cross-cutting device 70 has an enlarged area 25 which is free of the first roller 31. The enlarged area 25 favors that a large air flow 5 can penetrate from inside into the funnel housing 27, which at the same time can push the transverse separated web 4 into the funnel 12.

The embodiment according to Fig. 3 clarifies that it is off without the auxiliary roller 15 Fig. 2 can get along, with all the features off Fig. 2a and Fig. 2b also in the embodiment of Fig. 3 are included. As Fig. 3 corresponds to Fig. 4 essentially in accordance with the exemplary embodiment Fig. 2 , wherein the funnel housing 27 is designed differently, so that at least partially the preferred roller 16 extends from the hopper 12. According to Fig. 4 only results in a first air flow 17, which flows below the feed roller 16. The embodiment acc. Fig. 4 shows how Fig. 3 a preferred roller 16, wherein it is also conceivable, the embodiment according to Fig. 4 with the preferred roller 16 according to Fig. 2a and Fig. 2b to combine.

The embodiment according to Fig. 5 essentially corresponds to the embodiment according to Fig. 2a and Fig. 2b , wherein the embodiment according to Fig. 5 without advantage roller 16 and without auxiliary roller 15 manages. The remaining features of the embodiment according to Fig. 5 correspond to the explanations of the previously described Fig. 2 to Fig. 4 ,

In all embodiments, the transverse separation of the residual web 4 takes place with a time delay to a longitudinal separation of the longitudinal cutting device 60. The pressure within the funnel 12 can be adjusted inter alia by the closing element 14, which is movable between the closed position 21 and the open position 22. Before the cross-cutting of the residual web 4, the closing element 14 assumes the closed position 21. If after a defined time a reliable removal of the residual web 4 via the discharge device 10, the closing element 14 is transferred to the open position 22, whereby an assisting compensation air flow flows through the opening 19 in the hopper 12. Among other things, this compensation air flow can cause these to flow into the second Air flow 18 passes, or improved flow effects within the funnel 12 triggers.

According to Fig. 1 , which with all embodiments according to Fig. 2 to Fig. 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 via the rollers 31, 32, can be cut in various ways, wherein at the edge of the material web 2 residual webs 4 are formed, which can also be referred to as edge strips. As in Fig. 1 is shown, the funnels 12, in particular widened to the left and right, in order to be able to aspirate wider residual webs 4. Narrower funnels 12 are provided in the middle of the widened funnels 12 in order to suck off residual webs 4, which are narrower. These narrower residual webs 4 can also be referred to as central stripe.

It is also conceivable that the suction chamber 26 can accommodate all edge strips and central strips in order to re-supply them to the overall process or to continue these residual webs for disposal. Likewise, within the scope of the inventive concept according to Fig. 1 be provided that the suction chamber 26 has a plurality of 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. Thus, the operator of the device 1 according to the invention is free to "continue to process" the residual webs 4 within the separate cavities of the suction chamber 26 according to corresponding requirements. This means that certain residual webs, for example, are to be fed back into the overall process or certain residual webs have to be disposed of. According to Fig. 1 For example, each funnel 12 has an opening 28 through which the preferred roller 16 extends, the geometry of the opening 28 substantially corresponding to the geometry of the preferred roller 16.

LIST OF REFERENCE NUMBERS

1

device

2

web

3

part web

4

residual web

5

airflow

10

discharge device

11

discharge channel

12

funnel

13

inlet

14

closing element

15

auxiliary roll

16

advancement roller

17

first airflow

18

second air flow

19

opening

20

housing element

21

closed position

22

open position

23

first position

24

second position

25

enlarged area

26

suction chamber

27

Hopper 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 (23)

1. A device (1) for automatically cutting a web of material (2), having a longitudinal cutting device (60), by means of which the web of material (2) can be separated into at least one partial web (3) and into at least one residual web (4) in a longitudinal direction (L), a discharge device (10) for automatically discharging the obtained residual web (4), a transverse cutting device (70), which is downstream of the longitudinal cutting device (60) and is used for separating the residual web (4) transversely to the longitudinal direction (L), wherein the discharge device (10) has at least one funnel (12), which is formed with an inlet (13), in order to discharge the residual web (4),
   characterized in
   that within the funnel (12) an advancing roller (16) is arranged, in order to discharge the residual web (4) in an improved manner.
2. A device (1) according to Claim 1,
   characterized in
   that the advancing roller (16) is rotatably arranged within the funnel (12) in such a manner that a first air flow (17) is formed, which flows underneath the advancing roller (16), and a second air flow (18) is formed, which flows above the advancing roller (16).
3. A device (1) for automatically cutting a web of material (2), having a longitudinal cutting device (60), by means of which the web of material (2) can be separated into at least one partial web (3) and into at least one residual web (4) in a longitudinal direction (L), a discharge device (10) for automatically discharging the obtained residual web (4), a transverse cutting device (70), which is downstream of the longitudinal cutting device (60) and is used for separating the residual web (4) transversely to the longitudinal direction (L), wherein the discharge device (10) has at least one funnel (12), which is formed with an inlet (13), in order to discharge the residual web (4),
   characterized in,
   that the advancing roller (16) extends partially out of the funnel (12), wherein within the funnel (12) a flow (17) is established, which flows underneath the advancing roller (16).
4. A device (1) according to any one of the preceding claims,
   characterized in,
   that a separation of the residual web (4) from the partial web (3) takes place far before the transverse cutting device (70).
5. A device (1) according to any one of the preceding claims,
   characterized in,
   that the discharge device (10) has a plurality of discharge channels (11), in order to siphon off a plurality of residual webs (4), in particular, that the discharge channels (11) can be varied in their position relative to the web of material (2).
6. A device (1) according to any one of the preceding claims,
   characterized in
   that the discharge device (10) can be positioned on a first roller (31), which provides for a transport of a web of material (2), wherein in particular the geometry of the funnel (12) in the region of the inlet (13) is adapted at least partially to the geometry of the first roller (31).
7. A device (1) according to any one of the preceding claims,
   characterized in
   that at least one closing element (14) is provided, which can be moved between a closed position (21) and an open position (22), wherein in the closed position (21) an opening (19) of the funnel (12) is closed and in the open position (22) the opening (19) of the funnel (12) is opened.
8. A device (1) according to Claim 6 or 7,
   characterized in
   that in the region of the inlet (13), the transverse cutting device (70) is arranged downstream of the first roller (31).
9. A device (1) according to Claim 6, 7 or 8,
   characterized in
   that the discharge device (10) has at least one auxiliary roller (15), which can be moved between two positions (23, 24), wherein 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).
10. A device (1) according to Claim 9,
    characterized in,
    that the auxiliary roller (15) is mounted rotatably and/or displaceably on the funnel (12).
11. A device (1) according to Claim 9 or 10,
    characterized in
    that the auxiliary roller (15) is mounted rotatably on a housing element (20), wherein in particular the housing element (20) has a closing element (14).
12. A device (1) according to any one of the preceding Claims 6 to 11,
    characterized in
    that the inlet (13) of the funnel (12) in the direction of the transverse cutting device (70) has an enlarged region (25), which is free from the first roller (31).
13. A device (1) according to any one of the preceding claims,
    characterized in
    that the discharge device (10) has a suction chamber (26), into which the discharge channels (11) open.
14. A device (1) according to any one of the preceding claims,
    characterized in,
    that the advancing roller (16) extends through a plurality of funnels (12) arranged adjacent to one another, wherein in particular each funnel (12) has an aperture (28).
15. A device (1) according to any one of the preceding claims,
    characterized in
    that the funnel (12) and/or the advancing roller (16) is arranged relative to the longitudinal cutting device (60) in such a manner that, as of the longitudinal cutting device (60), the residual web (4) is separated from the partial web (3).
16. A method for operating a device (1) according to any one of Claims 1 to 15, for automatically cutting a web of material (2), having a discharge device (10), which is positioned on a first roller (31) transporting the web of material (2),
    a longitudinal cutting device (60) upstream of the first roller (31), by means of which the web of material (2) is separated in a longitudinal direction (L) into at least one partial web (3) and at least one residual web (4),
    a transverse cutting device (70) downstream from the longitudinal cutting device (60), which transverse cutting device separates the residual web (4) transversely to the longitudinal direction (L), wherein the discharge device (10) has funnels (12) with in each case one inlet (13) facing the first roller (31), through which the residual web (4) enters the discharge device (10),
    the inlet (13) of the funnel (12) has an enlarged region (25), which is free from the first roller (31), so that within the funnel (12) a pressure situation is established, whereby after a transverse separation of the residual web (4) by the transverse cutting device (70) an automatic discharging of the residual web (4) into the discharge device (10) is performed.
17. A method according to Claim 16,
    characterized in
    that the transverse separation of the residual web (4) takes place delayed in time relative to a longitudinal separation of the longitudinal cutting device (60).
18. A method according to Claim 16 or 17,
    characterized in,
    that the pressure (50) within the funnel (12) is established by a closing element (14), which in particular can be moved between a closed position (21) and an open position (22), wherein in the closed position (21) an opening (19) of the funnel (12) is closed and in the open position (22) the opening (19) of the funnel (12) is opened.
19. A method according to Claim 16, 17 or 18,
    characterized in,
    that before the transverse separation 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).
20. A method according to Claim 16, 17, 18 or 19,
    characterized in
    that an auxiliary roller (15) abuts against the first roller (31), if the transverse separation takes place, in order to prevent a course interruption in the web of material (2).
21. A method according to Claim 16, 17, 18, 19, or 20,
    characterized in,
    that within the funnel (12) an advancing roller (16) is arranged, which reliably discharges the residual web (4).
22. A method according to Claim 16, 17, 18, 19, 20 or 21 ,
    characterized in,
    that the funnel (12) and/or the advancing roller (16) is arranged relative to the longitudinal cutting device (60) in such a manner that after the transverse separation, as of the longitudinal cutting device (60), the residual web (4) is separated from the partial web (3).
23. A method according to Claim 16, 17, 18, 19, 20, 21 or 22,
    characterized in,
    that the separation of the residual web (4) from the partial web (3) takes place far before the transverse cutting device (70), in particular, the separation of the residual web (4) from the partial web (3) takes place before the discharge device (10).

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