EP0945382B1 - Roll winder drum - Google Patents

Description

The invention relates to a roll winder roller with a elastic surface layer on a core, in whose surface openings are arranged.

Such a roll winder roller is, for example known from EP 0 683 125 A2. Here are the openings in the surface as relatively short blind holes. They serve to structure the surface, to make the cover "softer" than that elastic surface layer forming material and is for itself. Instead of the openings, others can Serve surface structures, for example circumferential, spiral or cross-shaped grooves or pimple-like elevations.

The invention is based on a paper web described that wound up into a paper web roll becomes. Instead of the paper web, other material webs, for example cardboard or foils made of metal or plastic. The problem also arises with textile webs if they are not or only partially permeable to air.

When wrapping paper, air is in the area between the roll winder roller and the paper web. As a rule, this is the Carrier or backup roller. This problem grows with increasing Winding speed. The greater the speed the incoming paper web, the more air is in the area between the roller and the paper web moved in. This air causes the Web from the roller and thus on one hand to run, what dirty front edges on the winding roll causes. On the other hand, the contact deteriorates between the paper web and the roll winder roller and thus leads to problems in torque transmission.

This problem is known per se. There are already a number of proposed solutions have been made.

A scraper blade is provided in DE 29 44 958 A1, the on the paper roll and possibly on the Paper web rests to scrape the air off the web.

DE 38 43 246 C1 suggests drilling through the roller shell pass through and in a helical shape or circumferential grooves open to let. This is to ensure that by air entering the holes in other areas of the Roller that is not covered by the paper web, can escape again.

A similar proposal is made in DE 28 14 682 A1. The roller shown there has a circumferential direction running channels in their elastic reference, whereby the circumferential grooves one in a ratio of about 1: 2 narrowed mouth on the surface. This roller is used to drain webs. The elastic Cover is squeezed together in the nip so that the openings disappear. In front of the nip where the Amount of liquid is present, but the opening is open, so that the water can drain off here.

All of these solutions are either too expensive or too expensive do not show sufficient effect or they are not Can be used when the winding roll is relieved of compressed air is provided, in which the support roller jacket a represents the lateral seals of the pressure chamber.

JP-A-59-031245 shows a transport roller for a paper web with openings in the surface that with channels of a suction system running parallel to the axis are connected. The axially extending channels are over Radial bores and channels in the journal with a rotating union connected in which a suction port is arranged is.

US-A-3 405 855 shows a paper guide roll with a elastic surface, in the circumferential direction Grooves are provided to attach to the paper web to allow adhering air to drain.

GB-A-1 056 372 shows a guide roll for a paper web with a hard, non-compliant surface, through the holes that are with the hollow Interior of the roller communicating. A part the bores at a predetermined peripheral portion the roller can be vacuumed. Alternatively, the essential axial grooves on the surface the roller provided by the air at the axial ends can flow off.

The invention is based, the risk the floating of the material web even at higher speeds to reduce.

This task is the in a roll winder type mentioned solved in that each opening via a duct in connection with an air intake volume stands, at least in the circumferential direction of the Roller is completed.

The on the material web, especially a paper web, adhering air can then when the material web for Attachment to the winder roller comes into the air intake volume be pushed in. It says there "Alternative room" with a relatively large volume Available that can be filled via the channel. If the material web is lifted off the roller, then the air pushed in there can escape again.

This creates an air jam that could lead to air bubbles effectively avoided. The air intake volume must of course be of a certain size in order to accommodate Also take in air practically without resistance can. However, this is easily possible. Because the openings be kept relatively small in the surface marking of the material web can be avoided become. Of particular advantage, however, is the characteristic that the air intake volume is completed in the circumferential direction is. So there are no connections or short circuits between individual openings in the circumferential direction. Accordingly, the roll winder roller also used to seal a changing bed be in which with the help of compressed air a weight relief the winding roll is effected. The compressed air can also be pressed into the air intake volume become. An escape through connecting channels, which run approximately in the circumferential direction, however not possible. The one pushed into the air intake volume Compressed air is of course used to relieve the pressure on the rollers not available. The resulting losses but are relatively small. A collision with compressed air filled air intake volumes with those attached to the material web should absorb persistent air not because the beginning of the edition of the material web outside the compressed air zone.

The air intake volume is preferably dependent of the operating speed of the roller so great chosen that the pressure rise is less than 50 mbar remains. The roll winder roller has an operating speed, that of the target speed of the Roll winder is specified. Depending on the Operating speed, i.e. the peripheral speed the roller, the web of material becomes a certain Drag the amount of air to its surface. The higher the Speed, the greater the amount of Air and the larger the air intake volume must be chosen become. The necessary minimum size can be find out relatively easily by simple experiments.

The air intake volume preferably points in the axial direction and / or radial direction a larger extent than the channel on. So you can see the air intake volume provide a sufficient size without the cross section of the channel or the size of the opening must choose excessive. With this combination there is enough space to to absorb the air layer adhering to the material web. On the other hand, a marking of the material web effectively avoided.

Advantageously, several air intake volumes are essential connected to each other in the axial direction. A Connection of the air intake volumes in the axial direction harms with regard to the relief of compressed air Not winding roll, because then all openings and Air intake volumes that are interconnected are always subjected to the same pressure. on the other hand can the size by the "cross connection" of the connected air intake volumes quite considerably increase so that with a low constructive High impact can be achieved can.

The openings are preferably each in a line arranged opposite an axially parallel line includes a predetermined angle. You get there with the fact that not all at one revolution of the roller Openings of a row at the same time to the plant Material web come. This results in a smoother run. Out of roundness is kept small or even avoided. This also helps to reduce the marking risk at. By placing the channels under one predetermined angles to the surface can still be Use axially parallel connection channels.

The air intake volume preferably has during operation a predetermined minimum size. Air is in compressible to a significant degree. To the adherent However, as mentioned above, being able to take in air is a certain minimum volume is necessary. Dependent on of where the air intake volume is located it in operation due to the prevailing loads, e.g. the weight of the winding roll or the tensile force of the material web, to a deformation of the boundary walls this volume of air intake come, for example then when one or more boundary walls of the Air intake volume still in the elastic surface layer are arranged. Through the channels and the Cavities that form the air intake volumes the elastic property of the surface layer is not be significantly changed. Nevertheless, are smaller Deformation cannot be excluded. According to the invention now ensured by appropriate dimensioning that the air intake volume is maintained, at least with a given minimum size.

It is particularly preferred here that the air intake volume an essentially constant variable in operation having. This can increase pressure in the air intake volume be avoided if, for example, the corresponding Air intake volume under the nip or nip that the winding roll comes with the roll winder roller forms.

The air intake volume is preferably within one Insert arranged radially below the surface. The insert can be made relatively stable, so that the risk of deformation of the air intake volume stays small. Even if the stake is not completely ensures that deformation takes place, he can keep the deformation small.

The insert is preferably formed by the core. The channels are at least through the surface layer drilled through or otherwise produced. At its core, which is usually made of steel or cast iron, this results in a sufficiently stable boundary wall for the cavities in which the air intake volumes be formed.

Alternatively, the use can be made by essentially one axially extending tube be formed. Naturally this tube can also make a small angle with the Include axial direction. Such a pipe can for example in the elastic surface layer be embedded.

In a further alternative embodiment, the Use as a built-in part, the inside a roller shell is arranged, which forms the core. The roller is, as is often the case, as a hollow roller educated. You can get one in the hollow interior Insert the insert, for example radially outwards springs and axially extending on its radial outside Has recesses, which then with the core forming shell forms the cavities that the air intake volumes take up.

The volume of air intake is advantageously at a limit arranged between two layers of material. This makes it easier manufacturing. You can see the individual Air intake volumes when manufacturing the roller relative easily generate it by placing it on the outside of a Provides material before the next, radially further external material is applied. For example the air intake volumes on the border between the core and the surface layer or within a boundary between two layers of material Surface layer may be provided.

In addition to the openings, blind holes are advantageous provided in the surface. These blind holes can only be used to a limited extent to the adhesive Take in air. With those in question The radial thickness of the roll winder roll is sufficient Extent usually not sufficient to be sufficient to provide a large volume of air intake. But they can be used to make the elastic To change the properties of the surface layer.

Preferably, that of openings or openings and Blind boreholes penetrated less than 15% of the area Surface. In most cases, it will be enough keep it between 10 and 15%. So that the material web and the winding roll is adequately supported. On the other hand, there is enough cross-sectional area available through which the adhering to the material web Air can kick.

It is preferably provided that each air intake volume in a continuous axial direction the front closed chamber is arranged, the is divided axially by at least one partition. So you can with a simple construction of the roller Take changing roll widths into account. This training the roller allows a relatively simple manufacture. You can, for example, the chamber by an axial running hole form over the entire length the roller goes through. You can also use an axially extending one Pipe in the surface cover or in the cavity insert the core or between the surface layer and axially extending the surface of the core Provide grooves. In all cases it is beneficial if these components enclosing the chamber in the axial direction can let go because this is manufacturing simplified. If you now provide that additional There are partitions dividing this chamber, then you can also with a pressure relief Use changing roll widths of the winding roll. In In this case, you can build up the pressure face sealing elements on the width of the winding roll restrict. An axial short circuit path forms in this case, because the connection between Openings within the pressurized Area of the changing bed and outside of this area interrupted by the partition or partitions is.

The at least one partition is advantageous arranged stationary. This is enough if you do it beforehand knows which roll widths to wrap. If you arrange several partitions stationary, then you can correspondingly many different roll widths wrap.

It is advantageous in the axial direction between each two openings arranged a partition. Leave with it practically all roll widths wrap. As soon as one Opening in the pressurized area of the changing bed is placed, it is pressurized. The Compressed air cannot pass through the adjacent opening, which is then outside the pressurized area is arranged to escape because of the partition this prevents.

The partitions are preferably by means of clamping plugs educated. Clamping plugs, for example from one material comparable to rubber, can be axially in the chamber be driven. There is a certain Effort is necessary, but without the manufacturing more can be made available. As soon as the Stoppers have reached their intended location, clamp them tight. The clamping force is sufficient for the due to the air pressure in the changing bed to resist. Here, the clamp connection does not have to be absolutely tight. The tightness between the plugs and the wall of the chamber only has to be sufficient to ensure that the weight relief of the Maintain the necessary pressure in the changing bed remains.

In an alternative or additional embodiment can be provided that at least one partition in Is designed to be movable and fixable in the axial direction. In this case you can set the zone width that can be pressurized. The partition must just put between the two openings which are inside and outside an axial Limit of the pressurized zone of the changing bed. In this case you can see the air intake volume make relatively large within the pressurized zone, i.e. a pressure equalization between neighboring ones Air intake volumes are not hindered by partition walls.

Preferably, two partitions are in opposite directions in pairs movable. For example, if only two partitions are present, they can be to the axial plane of symmetry always adjust symmetrically. This makes it easier the setting of roll widths in particular then if only ever a single winding roll or axially adjacent winding rolls are wound.

Advantageously, several open one after the other in the circumferential direction arranged openings in the same air intake volume. This configuration can also be done directly use on the subject of the main patent without it it is necessary that the chamber is divided in the axial direction is. If multiple openings are available, then either the usable cross-section increases, through which the air can escape, or you can make the individual cross sections of the openings smaller make, so that the danger of marking the to be developed Material web becomes even smaller.

It is preferred that the same in the air intake volume opening in the circumferential direction have a smaller distance from each other than from openings, which in an adjacent in the circumferential direction Air intake volume flow out. This eliminates the risk that in the circumferential direction a "short circuit" arises, through which Escape pressure from the pressurized changing bed can, kept small.

In a preferred embodiment, that the air intake volume via at least one relief hole with a compensation volume in connection stands. This can ensure an even better adhesion of the material web can be reached on the surface of the roller. The term "relief drilling" is not intended here be limited to being pierced by a Process is established. The relief hole can can also be generated in other ways.

The air adhering to the material web can through the Open the opening and the duct into the air intake volume. The resulting pressure increase is not excessively large, but measurable. The higher pressure can as the roller continues to rotate through the relief bore be dismantled again. The air can namely through the relief hole in the compensation volume flow away. Because when the material web on the Surface of the roller has come to rest, no other If air is replenished, the material web comes after a predetermined time used to depressurize is, so after a predetermined angle of rotation the roller, to a very dense and therefore firm system to the surface of the roller. The facility is so firm and stable that the material web runs sideways practically no longer on the surface of the roller he follows. If the surface of the roller then in a zone comes where the winding roll with the help of compressed air is supported (run-out area), then this comes Compressed air, of course, also through the openings and the air intake volume to the relief bore. However, the pressure increase in the air intake volume is much stronger than that on the material web adhering air. Is also usually the angle of rotation, the surface of the roller in the printing area covered, shorter, so that although some air through drain the relief bore into the compensation volume can. However, this loss is tolerable. It lowers the pressure below the winding roll is not in one measure from which a much higher supply pressure is necessary would do. This combines the advantages a roller, the jacket of which is completely perforated and that’s why it’s not related to a Compressed air support can use with the advantages a roller that is used for compressed air support suitable is. The compromise is formed by the fact that the to drain the air through the relief hole available cross-sectional area essential is smaller than the sum of the cross-sectional areas of the Openings.

The compensation volume is preferably through an interior space formed, which is surrounded by the roll shell. This interior is available for many rollers anyway Available, which are designed as a hollow roller. If can use this interior as compensation volume you save yourself complicated cable routing.

The interior advantageously has a connection to the surroundings on. One can use the connection for this ensure that the pressure inside is the same, like in the environment, so atmospheric pressure. This Design has the advantage that the interior does not have to divide into a zone that corresponds to the printing area, i.e. the outlet area, is adjacent, and a Zone that is the infeed area for the web of material is adjacent. Rather, it allows that in the printing area Small amounts of compressed air in the interior can penetrate. This causes a pressure increase but not instead because of the pressure from the connection can escape to the environment. Accordingly leads this pressure increase also does not lead to a lifting of the material web in the "infeed area" of the roll winder roller.

The air intake volume is preferably in the axial direction divided into several chambers and each chamber has at least one relief hole. With this Design makes it easier to adapt the roll winder roller to different widths of the winding roles. Air from the compressed air support area can not then in the axial direction by the Escape aerial view volume. Still there is the possibility available that in the infeed area air adhering to the material web into the compensation volume can drain off.

The relief bore is preferably a throttle channel educated. This throttle channel forms a flow resistance for the air. That means that from entrained air that leads to a slight increase in pressure in the air intake volume, can flow through the throttle. Because for this one is available for a relatively long time, namely the Time in which the material web on the roller surface is present, which is quite about angular ranges in the order of magnitude from 120 to over 180 ° can be the case the material web can at least at the end of this wrap angle very firmly on the surface of the Put the roller on. With the sudden pressure increase, like when the corresponding surface area enters into the compressed air support zone the throttle, however, has a relatively large pressure drop. Air can also come from the air intake volume flow into the compensation volume. Because of the the air volume can even have a larger pressure difference be larger than in the inlet area. But it is always enough not yet out to a noteworthy pressure drop to lead in the air intake volume. Accordingly the pressure in the compressed air support zone too not significantly lowered, i.e. it is practically none additional power for feeding a larger one Air volume in the compressed air support area necessary.

Alternatively or in addition to this, the relief bore can be provided with a valve. This valve opens when the corresponding sector of the Roller is in the infeed area, so if from the material web entrained air through the relief bore should drain off. However, the corresponding one comes Roller sector in the exit area where due to the compressed air support the increased air pressure prevails, then the valve is closed and the outflow of air will be prevented.

This configuration can then be particularly simple realize if the valve is self-closing Valve is formed. As long as the pressure difference between the air intake volume and the compensation volume is small, the valve remains open. This is in Infeed area the case. However, the pressure difference bigger, as is the case if the corresponding Air intake volume comes into the outlet area, then the valve is closed. The valve can be designed in the manner of a check valve, that is kept open by springs or other forces, which are only overcome by a larger pressure difference can be.

The air intake volume is preferably through a pipe formed, which is arranged in an axial groove in the core, whose side walls overlap the tube towards the outside. Such a groove can be created, for example, by that first with an milling cutter with an axial groove a rectangular cross section is generated. Subsequently you can mill these grooves with a form cutter. Then when you push the tube in, it's in the radial direction, so against the centrifugal force, sure held. This is a relatively easy to implement and yet reliable solution.

Preferably, the tube essentially closes with the Surface of the core. This way you get again an almost smooth surface of the roller on which then the elastic surface layer can be applied can. The little grooves between the pipe and remain on the surface of the core, fill with the coating material and improve the adhesion between the surface layer and the core.

Fig. 1

einen schematischen Längsschnitt durch eine Rollenwicklerwalze,

Fig. 2

einen Ausschnitt eines Querschnitts der Walze nach Fig. 1,

Fig. 3

eine Detailansicht von Fig. 2 mit einer Ergänzung,

Fig. 4

eine Draufsicht auf die Oberfläche der Walze im Ausschnitt,

Fig. 5

verschiedene Ausführungsformen in der Ansicht nach Fig. 3,

Fig. 6

eine weitere Walze mit zwei verschiedenen Ausbildungen von Luftaufnahmevolumina,

Fig. 7

eine schematische Schnittansicht II-II nach Fig. 6,

Fig. 8

einen Ausschnitt einer weiteren Walze im Radialschnitt,

Fig. 9

eine Stirnseitenansicht der Walze nach Fig. 8,

Fig. 10

eine Einzelheit III aus Fig. 9 und

Fig. 11 bis 13

abgewandelte Nutformen.

The invention is described below with reference to preferred embodiments in conjunction with the drawing. In it show:

Fig. 1

2 shows a schematic longitudinal section through a roll winder roller,

Fig. 2

1 shows a section of a cross section of the roller according to FIG. 1,

Fig. 3

2 with a supplement,

Fig. 4

a plan view of the surface of the roller in the cutout,

Fig. 5

3 different embodiments in the view according to FIG. 3,

Fig. 6

another roller with two different designs of air intake volumes,

Fig. 7

6 shows a schematic sectional view II-II according to FIG. 6,

Fig. 8

a section of another roller in radial section,

Fig. 9

8 shows an end view of the roller according to FIG. 8,

Fig. 10

a detail III from Fig. 9 and

11 to 13

modified groove shapes.

Fig. 1 shows a roller 1 with a core made of steel or Cast, which is designed as a shell, i.e. a hollow Interior 3 has.

The roller shown can be used, for example, as a supporting roller be used in a roll winder, where two carrier rollers together form a changing bed, that are pressurized with compressed air can to relieve the weight of a winding roll cause.

The interior of the covers is on the two end faces 4, 5 closed, to which the roll neck 6, 7 attached are. 9 shows a top view, for example on one side with a lid.

On the outside of the core 2 is an elastic Layer 8 arranged, for example made of rubber or a comparable elastomer can be formed.

The core 2 is drilled peripherally, i.e. he has one Plurality of parallel to the axial direction 9 Bores 10, which also pass through the covers 4, 5 and closed at the end faces with plug 11 are. The holes 10 can, for example, one Have a diameter of about 10 mm.

Openings 12 are provided in the rubber layer 8. each Opening 12 is via a channel 13 with the bore 10 in connection. Accordingly, air from the Surface 14 of the layer 8 through the channel 13 in the Get hole 10 and back. The bore 10 forms that is, an air intake volume. The channel has one Diameters in the order of 3 to 4 mm.

If a material web is used in a roll winder is guided around the roller 1, then can the air adhering to the material web through the openings 12 and the channels 13 in the as air intake volume trained bores 10 arrive. simultaneously but is prevented from going around the circumference of the roller 1 around gives a short circuit for compressed air, so that a such roller easily related to a compressed air relief of the winding roll used can be. The compressed air is also in the Aerial volume 10 pressed. But it cannot continue to flow because the air intake volumes in the circumferential direction Are completed.

Of course, it is permissible if the bore 10 has a small deviation from the axial direction as long as therefore no short circuit between a print area in the changing bed and an outside area arises.

The size of the bore 10 and thus the size of each the air intake volume is so chosen that when the material web runs through the adhering air there is no major pressure increase. The pressure increase in the bore 10 remains below 50 mbar, usually even at a maximum of 10 mbar.

In addition, blind holes can also be found in layer 8 15 are provided, which lead to a slight change, especially softening that leads to layer 8. The Sum of the areas of the openings 12 and the blind bores 15 in the surface 14 have a share of below 15%, preferably between 10 and 15%. So that will the elastic property of layer 8 is not significant changed. The risk that the openings 12 and the blind bores 15 to markings in the material web lead remains small. On the other hand, the layer 8 so stable that the cross section of the channels 13 always remains open. The channels 13 and the bores 10 (if the holes 10 are arranged in the layer 8) never completely of displaced material elastic layer 8 filled.

From Fig. 4 it can be seen that the openings 10 and the blind bores 15, on the one hand, are not exactly circumferential lying one behind the other and not exactly lie next to each other parallel to the axial direction 9. Rather, small angles .alpha., .Beta Exaggerated for reasons of clarity are. They just have to be so big that not all openings 12 or blind holes 15 in a row come into contact with the material web at the same time.

5 shows several alternatives, such as the air intake volumes and the openings 12 and the channels 13 can be arranged to each other. The blind holes 15 are omitted for the sake of clarity.

5a shows one more for a better comparison Arrangement as already shown schematically in Fig. 3 is. The holes 10 are provided in the core 2 and form the air intake volume there. You are over Channels 13, both the elastic layer 8 and push a part of the core 2 through with the openings 12 connected to the surface 14.

5b, the channels are 13 not only through the entire surface layer 8, but also performed by the thickness of the core 2. In the interior 3 of the core tubes 15 are arranged which the Form air intake volumes.

In Fig. 5c the air intake volumes are axial extending grooves 17 formed with a semicircular cross section, the in the radially outer surface of the Core 2 are arranged. The channels 13 enforce the elastic layer and open into the grooves 17. Between the elastic layer 8 and the core 2 is a sealing tape 18 arranged, which prevents the air in the area of contact between the elastic Layer 8 and the core 2 is pressed.

5d, the tubes 16 are in the elastic layer arranged. The elastic layer consists of two parts, namely one located radially further out Layer 8a made of a softer material, for example softer rubber, and one radially further inside lying layer 8b made of a harder material, for example harder rubber. The tubes 16 are here in the area of contact between the two views 8a, 8b arranged.

5e shows a similar embodiment with a single-layer layer 8. Here are the tubes 16 on the Border arranged between the core 2 and the layer 8.

5f shows an embodiment in which the channels 13 again fully enforce layer 8 and core 2. An insert 19 is arranged in the cavity 3, which has grooves 20 on its radial outside. The grooves 20 run essentially in the axial direction. The insert 19 expresses itself with a certain Preload against the inside of the core 2. Accordingly the grooves 20 form the air intake volumes.

5g, the tubes 16 are in turn arranged in layer 8, but this time completely in layer 8. You can, as shown, the border to the core 2 arranged adjacent his. Of course, it is also possible to use them to shift further radially outwards.

Fig. 5h shows an embodiment without stabilizing Measures come down to the volume of the holes 10 to keep constant. Although will be due the elasticity of the layer 8 a small in operation Deformation result. However, this is not critical because it only takes place when the material web is already rests on the surface 14 of the roller which critical air bubble is eliminated.

The rollers shown can both be put together with compressed air relief as well as without compressed air relief use. In all cases, the material web lies smooth on the surface 15 of the roller.

The bore 10 thus forms a chamber. This chamber can now be divided axially by several partition walls 30, 31 be so that several within the bore 10 Air intake volumes are formed.

Fig. 6 shows two different ways to Bore 10 in the axial direction in several air intake volumes to divide.

An embodiment is shown in the upper half, in which the partitions 30 by clamping plugs be formed. Between every two neighboring ones Channels 13 each have a partition 30. Air flowing through a duct 13 into an air intake volume 36 arrives, can only again through the channel 13 escape, but not through adjacent channels. In order to a short circuit is avoided, for example would have negative effects if a winding roll or a lying stack of adjacent winding rolls would be wound, the axial length of which is smaller is as the axial length of the roller 1. In this case could namely when compressed air is applied to the changing bed the compressed air through a centrally located duct 13 enter and continue axially through the bore 10 get out where they exit through a canal could be outside of a sealed area lies in which the compressed air is applied to the winding roll he follows.

By using a plurality of partitions 30, each channel 13 has its own air intake volume 36 assignments, one is in the choice of those to be wrapped Roll width extremely flexible.

Another possibility is in the lower half of FIG. 6 shown. Here are only two partitions 31 provided that are axially movable in the bore 10. The partitions 31 are arranged on a threaded spindle 32, on the right a right hand thread 34 and on the left Left thread 35 has. When you have an actuator 33 rotates, the partitions 31 move in opposite directions in the axial direction symmetrical to a plane of symmetry in the axial center of the roller 1. This training has particular advantages if you have the Always place the winding roll in the center of the roller 1. By adjusting the position of the partition walls 31 with The width of the threaded spindle 32 can then be adjusted the pressurized zone to the width of the winding roll to adjust.

Of course, with a roller you only become one of the two Use solutions shown in Fig. 6.

From Fig. 7 it can be seen that there are also several in the circumferential direction arranged one behind the other channels 13, in In the present case, two channels 13, in the same hole 10 can flow. Accordingly, the Openings 12a and 12b in the surface 14 with the same bore 10 in connection. Adjacent openings 12c and 12d communicate with other holes. Here is the distance between two openings 12a, 12b connected to the same bore 10 stand, in the circumferential direction smaller than the distance between two holes 12a, 12c and 12b, 12d, which in different Holes 10 open. Through this configuration you can either use the flow cross section enlarge so that the air with even less resistance gets into the bore 10, or you can Keep the cross section of each individual opening 12a, 12b small, to further reduce the marking sensitivity.

8, the core 2 has a Variety of circumferentially evenly distributed Axial grooves 17 on its radially outer surface. These grooves 17 can be milled, for example. They originally have a rectangular cross section. To the bulged or bulged shown To create walls 43 is used after insertion the rectangular grooves a ball mill, so that the cross section the grooves 17 is substantially circular.

In each of these grooves 17 is a tube 16, for example made of brass, arranged. It lies on the bottom of the groove and gets out from the side walls of the groove overlapped. This brass tube can be easily from one Front of the roller 1 are inserted here.

The depth of the groove 17 is chosen so that the outer Surface of the tube 16 with the surface of the core 2 practically completes. This leaves the uncoated Just roll narrow grooves on both Sides of the tube 16, the 8 can be concluded, but no negative effects have on the uniformity of the covering 8.

Openings 12 are provided in the elastic layer 8. Each opening 12 is above a channel 13 and one Bore 45 in the wall of tube 16 with an air intake volume 10 connected through the inside of the Tube 16 is formed. There are several inside the tube Plug 11 arranged distributed in the axial direction, which the air intake volume 10 axially into several sections or chambers divided. While the pipe 16 an inner diameter of the order of 10 mm has, the channel 13 has a diameter in the The order of 3 to 4 mm.

The interior 3 of the roller is through a relief bore 40 connected to the inside of the tube 16. For this the relief bore 40 is guided through the core 2. The tube 16 also has a corresponding bore 46 on. The bore 46 can be closed by a valve formed by a plate 41 made by Springs 42 at a certain distance from the inner wall of the Tube 16 is held. So this valve is normal open. If, however, a slightly higher pressure differential between the inside of the tube 16, i.e. the Air intake volume 10, and the interior 3 is present, then the plate 41 is against the inner wall of the tube 16th pressed and closes the relief bore 40.

The relief bore 40 is designed as a throttle, i.e. it sets a certain amount of air flowing through Resistance to. So in some cases it is Valve 41, 42 is not even necessary.

When the roller 1 is used in a roll winder a material web 47 then runs, as in FIG. 9 shown, wraps around the roller 1 over an angle of just over 180 ° and then on a roll 48 wound up. The area where the web of material 47 rests on the roller 1, is also called "Infeed area" a. To the pressure of the increasing role 48 on the roller 1 not To get too big is in a so-called "Run-out area" b, which covers an essential extends smaller angle, a compressed air support provided, i.e. here in one by the roller 1, the roller 48 and other elements not shown confined space creates a higher air pressure.

Air adheres to the material web 47 as it approaches it at first, a smooth and full system of the material web 47 prevented on the surface 14 of the roller 1. However, the air can pass through openings 12 and the channels 13 penetrate into the air intake volume 10. The pressure increase is relatively small. Since the Material web over a relatively long period of time Roller 1 abuts, can in each air intake volume 10th a pressure equalization to the interior 3 take place over the relief holes 40. Since during the edition the material web 47 on the roller 1 no supply of Air takes place after a certain angle of rotation the roller 1 actually all or almost all of the air between the material web 47 and the surface 14 of the Roller 1 displaced. The material web 47 then adheres relatively firmly on the roller 1, so that bleeding is avoided can be.

If the roller continues to turn, the openings will come 12 also in the outlet area b, where the corresponding there is higher pressure. Of course plants this higher air pressure also in the air intake volume 10 continues. Due to the higher pressure difference between the air intake volume 10 and the interior 3 of the roller 1 but closes the valve 41, 42 so that the air cannot flow into the interior. A loss of pressure therefore does not take place in outlet zone b.

Even if the valve 41, 42 is missing, the pressure loss is negligible small. The relief bore 40 lets air flowing out. Because of their flow resistance the amount of air flowing out is still how before relatively small.

So that the outflowing air does not increase the Pressure in the interior 3 of the roller 1 leads are in the Covers 4 openings 44 are provided through which the interior 3 communicates with the surrounding atmosphere.

The cross section of the axial groove 17 can also be different from that in FIG 9 illustrates being shaped. So are with the Axialnut 17a in Fig. 11 through the curved walls 43 Pairs of tangent walls 43a replaced. The side walls of the axial groove 17b in FIG. 12 have one recess each with parallel bases 43b. In the axial groove 17c in Fig. 13 is the Cross-section trapezoidal with correspondingly sloping side walls 43c. In all cases, the tube 16 sits on Groove base and is in at least two places from contacted the groove wall, so that there is a secure locking of the pipe results. The axial grooves can be in be produced in such a way that first a rectangular groove milled and then using a form cutter exact groove shape is generated.

Claims (31)

1. Reel winding roll having a resilient surface layer (8) on a core (2), openings (12) being arranged in the surface of the surface layer (8), characterized in that each opening (12) is connected via a duct (13) to an air absorption volume (10, 16, 17, 20) which is closed, at least in the circumferential direction of the roll (1).
2. Roll according to Claim 1, characterized in that the air absorption volume (10, 16, 17, 20) is chosen to be of a size depending on the operating speed of the roll (1) such that the pressure rise remains less than 50 mbar.
3. Roll according to Claim 1 or 2, characterized in that the air absorption volume (10, 16, 17, 20) has a greater extent in the axial direction (9) and/or radial direction than the duct.
4. Roll according to one of Claims 1 to 3, characterized in that a plurality of air absorption volumes (10, 16, 17, 20) are connected to one another, substantially in the axial direction (9).
5. Roll according to one of Claims 1 to 4, characterized in that the openings (12) are each arranged on a line which forms a predetermined angle (β) with respect to a line parallel to the axis.
6. Roll according to one of Claims 1 to 5, characterized in that, during operation, the air absorption volume (10, 16, 17, 20) has a predetermined minimum size.
7. Roll according to one of Claims 1 to 6, characterized in that, in operation, the air absorption volume (10, 16, 17, 20) has a substantially constant size.
8. Roll according to one of Claims 1 to 7, characterized in that the air absorption volume (10, 16, 17, 20) is arranged within an insert radially underneath the surface (14).
9. Roll according to Claim 8, characterized in that the insert is formed by the core (2).
10. Roll according to Claim 8, characterized in that the insert is formed by a pipe (16) extending substantially axially.
11. Roll according to Claim 8, characterized in that the insert is designed as an installed part (19) which is arranged within a roll shell which forms the core (2).
12. Roll according to one of Claims 1 to 10, characterized in that the air absorption volume (16, 17) is arranged at a boundary between two material layers (2, 8; 8a, 8b).
13. Roll according to one of Claims 1 to 12, characterized in that, in addition to the openings (12), blind holes (15) are provided in the surface (14).
14. Roll according to one of Claims 1 to 13, characterized in that the region through which openings (12) or openings (12) and blind holes (15) pass is less than 15% of the surface (14).
15. Roll according to one of Claims 1 to 14, characterized in that each air absorption volume (36) is arranged in a chamber (10) which passes through in the axial direction and is closed at the end and which is subdivided axially by at least one dividing wall (30, 31).
16. Roll according to Claim 15, characterized in that the at least one dividing wall (30) is arranged to be stationary.
17. Roll according to Claim 15 or 16, characterized in that, in the axial direction (9), a dividing wall (30) is arranged between each two openings (12).
18. Roll according to one of Claims 15 to 17, characterized in that the dividing walls (30) are formed by gripping plugs.
19. Roll according to one of Claims 15 to 18, characterized in that at least one dividing wall (31) is designed such that it can be moved and fixed in the axial direction.
20. Roll according to Claim 19, characterized in that in each case two dividing walls (31) can be moved in opposite directions in pairs.
21. Roll according to one of Claims 15 to 20, characterized in that a plurality of openings (12a, 12b) arranged one behind another in the circumferential direction open into the same air absorption volume (10).
22. Roll according to Claim 21, characterized in that the openings (12a, 12b) that open into the same air absorption volume (10) have a smaller spacing from one another in the circumferential direction than from openings (12c, 12d) which open into an air absorption volume that is adjacent in the circumferential direction.
23. Roll according to one of Claims 1 to 22, characterized in that the air absorption volume (10) is connected to a compensating volume (3) via at least one relief bore (40).
24. Roll according to Claim 23, characterized in that the compensating volume (3) is formed by an internal space which is surrounded by the roll cover (2).
25. Roll according to Claim 24, characterized in that the internal space (3) has a connection to the surroundings.
26. Roll according to one of Claims 23 to 25, characterized in that the air absorption volume (10) is subdivided in the axial direction into a plurality of chambers, and each chamber has at least one relief bore (40).
27. Roll according to one of Claims 23 to 26, characterized in that the relief bore (40) is constructed as a restrictor duct.
28. Roll according to one of Claims 23 to 27, characterized in that the relief bore (40) is provided with a valve (41, 42).
29. Roll according to Claim 28, characterized in that the valve (41, 42) is constructed as a self-closing valve.
30. Roll according to one of Claims 23 to 29, characterized in that the air absorption volume (10) is formed by a pipe (16) which is arranged in an axial groove (17; 17a; 17b; 17c) in the core, whose side walls (43; 43a; 43b; 43c) engage over the outside of the pipe.
31. Roll according to Claim 30, characterized in that the pipe (16) terminates substantially at the surface of the core (2).

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