EP2202160A1 - Method and device for securing covers on the side of a material sheet roll - Google Patents

Abstract

The method involves attaching an external front cover (28) under pressure against a front side (30) of a material web roll (29) using a pressing element (4), where the pressing element is movable in a longitudinal direction (x) of a roll positioning device (2) with respect to the front side of the material web roll. A thrust bearing (8) of the pressing element is formed under an effect of reaction force (Fr) caused by a pressing process. A common control device i.e. common pressure device, is utilized by the pressing element and the thrust bearing. An independent claim is also included for a device for attaching an external front cover to a front side of a material web roll, comprising a roll positioning device.

Description

The invention relates to a method for attaching end caps on a front side of a roll of web material by means of at least one pressing element of a device for attaching end covers to web rolls, wherein the contact element applies the end cover under pressure against the end face of the web roll.

The invention further relates to a device for attaching end caps on a front side of web rolls with a roller bearing device with at least one movable in the longitudinal direction of the roller bearing device relative to the end face of the web roll pressing element and at least one Packpressenantrieb.

Methods and devices for attaching end covers, in particular outer end covers on the front sides with material web rolls wrapped with packaging material, in particular for attachment to folding edges formed by the envelope and an inner end cover fixed in the axial direction by the folding edges are known in different embodiments from the prior art. These comprise at least one pressing element, which is movable relative to the end face of the roll of web material and can be pressed against it, wherein the end cover arranged therebetween is glued to the peripheral packaging, in particular the projecting fold edges. Depending on the design of the device, the individual end caps are applied to the contact pressure, possibly additionally heated and pressed against the roller end face. The pressing elements are designed plan and are generally aligned plane-parallel to the end face of the web roll relative to this moved and approached to this. Preferably, at least two such pressing elements are provided per device, which can be assigned to the individual end faces of the material web roll directed away from one another. Thus, the trapped between the front cover and the packaging air can escape more easily, it is known to approach the pressing elements at an angle to the end face of the web roll in a forward movement and fold for the purpose of Anpressvorganges, that is, from the inclined position in a plane-parallel position to transfer to the front page. As a result, a contact pressure force is applied to the end face of the material web roll with the entire pressure surface formed on the contact pressure element, so that a surface pressure is generated over the entire surface covered by the contact surface. To ensure correspondingly high surface pressures very large contact forces are required. The contact pressure of the contact surface can be realized by different drive concepts. These are characterized either by a separation of functions for the realization of the feed movement and the generation of the contact force or free of such a separation of functions, in the latter case, the contact force is applied by the means for generating the feed movement of the pressing with, which in total very high drive power required leaves.

From the publication DE 199 61 665 A1 a device for fastening end caps on the end faces of web rolls is known which comprises a roller bearing device, at least one movable in the longitudinal direction of the roller bearing means pressing element in the form of a pressure plate and a drive, the pack press drive in a feed drive, which carries the contact pressure element and the Anpresselementantrieb, and the Anpresselementantrieb for applying the required contact pressure on the contact element is divided. The actual Anpresselementantrieb is arranged between the pressure plate and the feed drive. This design allows the functional separation between the actual feed movement and the contact pressure of the pressing a particularly simple and cost-effective design of the entire Packpressenantriebes, with only low drive power required for the feed movement. However, since such a device in the sense of classic presses forms an abutment before the beginning of the pressing process, the achievable clock frequency is not to be increased beyond a certain level due to the associated step-by-step positioning tasks. Also constructive care must be taken that the way to be overcome for the press drive after its abutment way is not too long to avoid unfavorable leverage ratios in the pressure transmission.

The invention is therefore based on the object to provide a piece-oriented and highly effective method and a corresponding device for attaching end caps on the front side of a web roll.

This object is achieved according to the invention in a method of the type mentioned above, that forms the abutment of the contact pressure element under the action of the reaction force caused by the Anpressvorgang.

In this way, a very elegant, practically flowing transition between the, during the packaging of roles, necessary in the pressing of the end cover movements, so that such a method is capable of particularly high performance packs. The contact between the pressing element and the roller end side is the initiator of the temporary formation of the abutment for the pressing element, so that the packing process particularly strongly oriented to the geometric relationships of the roll to be packed.

The method is thus characterized in that the pressing element is first brought into contact with at least a portion of at least one end face of the roll to be packaged. In this case, the contact pressure element experiences a resistance, which is used as an initiator of the temporary formation of the abutment for the drive element.

In an advantageous variant, the method is characterized in that the abutment of the contact pressure element during pressure build-up and regresses again during pressure reduction, in particular simultaneously with the course of the acting reaction force.

Such a variant is particularly advantageous since the load capacity of the abutment always behaves proportional to the reaction force. For this purpose, it is conceivable, in particular, that a reversal of the cause-and-effect principle takes place between the two processes, forming and regressing the abutment. In the formation of the abutment, at least one section of the contact pressure element initially comes into contact with at least one section of at least one end face of the material web roll to be packaged. In this case, the contact pressure element experiences a reaction force emanating from the web roll to be packaged. This reaction force initiate the actual formation of the abutment. The possibly slightly receding during this process pressing member is then blocked in its rearward movement. The increasing pressure in the pressure device then continues to act as contact pressure on the front cover. At the same time, the pressure applied in the pressure device can also act on the support element of the abutment.

To reduce the abutment, the compression pressure is first reduced. Ideally, this is done by lowering the pressure applied in the pressure device. Along with this, the abutment also forms back. The reaction force drops and eventually becomes zero. In such a variant of the method, primarily non-positive or frictionally engaged elements are used to form the abutment. In this case, the abutment can form along a suitable path independently of fixed locking points, so that the path to be traveled for the contact pressure element in the further course of the press can remain low. Due to the unneeded locking elements and a relatively simple control technology, such a method can be implemented with low investment requirements and can also be particularly suitable for retrofitting or redesigning existing methods for attaching end covers on end faces of web rolls.

For this purpose, it is of particular advantage if the regression of the abutment of the contact pressure element is delayed and / or expires with a delay. In this way, it is ensured that the pressure element can always be supported securely at its abutment even with decreasing contact pressure. In particular, hydraulic, pneumatic or electronic delay elements can be active in the packing process for this purpose.

In another advantageous variant, the method is characterized in that the abutment of the contact element discretely off and back again.

Such a variant is characterized in that, after initiation by the reaction force experienced at the contact pressure element of the material web roll to be packaged, a secure abutment is formed which primarily has a form-fitting effect and thus immediately, but at least within shortest time (locking path) is fully loaded. In the prior art, when using a shared pack press principle, but so far proceeded as follows: First, the pressing unit is moved to a front side of the web roll to be packaged, then brought to a standstill before reaching the front side at a suitable locking position, where appropriate, adjusted and subsequently locked. Then the remaining distance is covered. Only then can the actual pressing process begin.

A variant of the inventive solution, which is characterized by a discreet off and back again forming abutment of the contact element, compared to the aforementioned variant usually requires a higher investment, but is particularly well suited for coping with packing processes, in which heavy web rolls, with web widths between 200 mm and 5,000 mm, with high cycle frequencies preferably of over 80 rolls per hour, more preferably of over 120 rolls per hour, to be packed. Because of the high weights of the material web rolls and the relatively high speeds of travel of the contact pressure element on the end face of the material web rolls, extremely large forces arise.

It is advantageous if the contact pressure element and the abutment of the contact pressure element use at least one common setting device, in particular a common pressure device.

This ensures that the formation of the abutment is coupled with the increasing contact pressure.

In the case of a steadily forming abutment, the pressure building up in the pressure device during the pressing process also acts on the abutment. This ensures a proportional behavior. about suitable actuators, a proportional ratio can be defined. For this purpose, it is possible, on the one hand, that this ratio is determined once structurally, or can be optionally changed by means of suitable control or regulating devices, in particular also during operation, that is, during the packing process.

In a suitable case, a hydraulic pressure device may be provided for implementing the method. The hydraulic pressure device may have a separate adjusting device in the form of a pressure chamber in the coupling region to the abutment. Valves can be used to control the pressure acting on the contact pressure element and the abutment pressure ratio. Due to the variably adjustable pressure ratio, it is additionally possible to react actively to changes in the components which transmit the contact pressure, in particular wear on the support element, while maintaining a required braking force.

If delay elements, for example in the form of suitable valves, are provided as outflows to the separate pressure chamber, the regression of the abutment can be delayed with respect to the regression of the contact pressure and / or can take place with a delay.

In the case of a discreetly forming and returning abutment, the formation of the abutment can take place after reaching a previously defined pressure in the common printing device in one or more steps. A common printing device can also be understood as meaning a plurality of individual, mutually coupled local printing devices.

A common actuator can generally be understood to mean a force-generating means. It can be next to a hydraulic or pneumatic pressure device also to act a suitable electromechanical device.

The object underlying the invention is achieved in a device of the type mentioned in the present invention, that the device has a support element which is suitable to form a pressing element serving abutment under the action of the contact pressure caused by the reaction force to a stationary device , in particular a housing / frame or a foundation, releasably support.

In this way, a very elegant, practically flowing, transition between the, in the packaging of roles, in the pressing of the front cover necessary movements are achievable and high packaging performance feasible. The temporary formation of the abutment of the pressing element can be initiated by contact between the pressing element and the roller end face. For this purpose, the contact pressure element can first be brought into contact with at least one section of at least one end face of the roll to be packed.

In an advantageous embodiment, the support element is supported non-positively and / or positively.

In the case of a predominantly non-positive support of the supporting element of the abutment of the pressing element is particularly well a steady education or regression of the abutment of the contact element feasible. In this way, the load capacity of the abutment can be set in a proportional relationship to the reaction force. A support element is to be designed such that it is free of defined locking points to form the abutment in the range of a suitable path. For example, a support element in the form of a brake pad formed and against a steel or concrete rail a stationary device, in particular a housing or frame or a foundation, be pressed. In this case, the surface of the region which can be brought into operative connection with the supporting element of the corresponding stationary device can have a suitable profiling. In this way, such a device variant also receives a form-fitting component. Likewise, friction-increasing coatings of the corresponding stationary device are also conceivable. Such a device is also inexpensive to manufacture.
In the case of a predominantly positive support of the support element after initiation by experienced at the contact force reaction force of the web roll to be packaged a safe abutment can be formed, which is fully resilient within a very short time, after overcoming a Verklemmungs- or locking path. This variant usually requires a higher investment requirement compared to the aforementioned variant, but is particularly well suited for coping with packing processes in which heavy material web rolls are to be packed with high clock frequencies. Due to the high weights, which are typically between 0.6 t and 12 t, the material web rolls and the relatively high acceleration velocities of the contact pressure element on the end face of the material web rolls result in extremely large forces.

Furthermore, it is advantageous if the resistor required for forming the abutment, or at least for initiating it, can be selected, in particular controlled or regulated.

In this way, the device is particularly well adapted to the requirements of the respective material web rolls to be packaged. Such a device is thus characterized in particular by a high piece-equity orientation. Also, such a device is im Over the years evolving parameters of the end cover used, in particular their adhesive properties and the associated contact pressure required adjustable.

A device may be particularly preferably configured when the support member has a releasable locking device or is in communication with a releasable lock.

In this way, the abutment is particularly stable and resilient.

It may be of great advantage if a triggering device is present, via which the locking device can be activated and / or deactivated again.

With the help of a triggering device, it is possible to abruptly overcome the path required for a positive support of the support element, so the Verklemmungs- or locking path, by activation to allow instantaneous formation of the abutment. By deactivating the locking device as instantaneous resolution of the abutment is enabled. The reaction force on the pressing element or the momentarily effective contact pressure are used as parameters for activation and deactivation respectively. The amount to be determined for the respective switching operation may be structurally defined, or preferably be modifiable via suitable control or regulating devices, in particular also during operation, ie during the packing process.

• Lage der zu verpackenden Materialbahnrolle
• Kenngrößen der zu verpackenden Materialbahn
• Anpresskraft / Anpressdruck
• Reaktionskräfte
• Leistungskenngrößen des oder der Antriebe
• Stellwege, insbesondere solche, die im Zusammenhang mit dem eigentlichen Pressvorgang und/oder den Abstützelementen stehen.

Furthermore, it is advantageous if sensors are provided by which at least one of the following parameters for controlling / regulating the device can be detected:

• Location of the web roll to be packaged
• Characteristics of the material web to be packaged
• Contact pressure / contact pressure
• reaction forces
• Performance characteristics of the drive or drives
• Travel paths, in particular those that are related to the actual pressing process and / or the support elements.

Such a configured device has particularly good conditions for a product-oriented, adaptable and user-friendly design of the control or the regulation of the device. In particular, when detecting several of the above parameters, production errors are excluded with a high level of security.

It is particularly preferred if the at least one pressing element is arranged movable, preferably guidable, on at least one supporting element which is movable, preferably guidable, relative to the stationary device, in particular the housing / frame or the foundation. Moreover, it is of particular advantage if the support element is movable by the pack press drive and the at least one pressing element has at least one separate drive.

In this way, a decoupling of the actual feed movement of the Anpresskrafterzeugung, so that the Packpressenantrieb for generating the basic feed movement over which the individual pressing elements are moved in position relative to the end faces of the web roll, can be kept free of the effect of the reaction force on the contact pressure, which leads to an increase in the availability of the components forming this drive and allows an interpretation of the pack press drive free of the consideration of any reaction forces to be supported. The required power of the pack press drive can thus be reduced. The individual drives The pressing elements can perform their tasks correspondingly high performance at relatively low travel distances and are provided as appropriate performance relatively inexpensive.

It is of great advantage if on both sides of the roll of web material to be packaged in each case one, on one of the stationary device, in particular the housing / frame or the foundation, against movable, preferably feasible, support element movable, preferably feasible, arranged pressing element is provided, the two Supporting elements are coupled to the same pack press drive.

In this way, at the same time the front cover on both sides of the web roll free from a required rotation of the roll of web material about a perpendicular to its theoretical longitudinal axis attachable. The individual pressing elements associated drives are preferably designed and arranged in an analogous manner, the formation is mirror images. In a first variant, the individual pressing elements associated drives can be completely self-sufficient driven and operated. For this purpose, each drive is preferably associated with its own control / regulation which, depending on the desired mode of operation, drives the pack press drive, the pressing element drive or drives and optionally the support element (s) of the abutment (s). Under control / regulation is understood as the entirety of a central or virtual control device, the required sensors and actuators and the connections between them - wirelessly or via lines.

According to a particularly advantageous second variant, however, a positive coupling takes place in the actuation and / or corresponding movement of the pressing elements and thus the operation of the device for attaching end caps. It is first to distinguish whether a or two Anpresseinheiten are provided. If two press units are provided, both press units have their own drives for the actual pressing process. Their respective feed movements, however, can be realized via a common pack press drive or via individual pack press drives. In a first sub-variant, in addition to two pressing units, a common pack press drive is provided for realizing the feed movements of the individual pressing units to be made in advance of the actual pressing operation. A possible positive coupling of the drives of the individual Anpresseinheiten is then implemented via a two jointly associated control / regulation.

Preferably, the both sides of the end faces of a roll of web material arranged drives the pressing elements are so positively coupled together that a plant of the end cover can be done simultaneously or synchronously or at a predefined time interval at both ends of the web roll. This forced coupling can be realized in different ways. In the simplest case, this can be generated by a common control by the temporal sequence of the control of the individual devices of the pack press drive and the drives of the Anpresseinheiten is matched in a corresponding manner to each other. With this solution, the feed paths and the required contact forces can thus vary greatly from each other. The individual pressing unit, which is assigned to one end face in each case, can be designed in an optimized manner for operation on it. The individual drives include a control / regulation.

If a mechanical positive coupling is selected, which allows a simultaneous adjustment movement of the individual pressing elements to the respective end face, can dispense with a corresponding control / regulation become. The drive is preferably realized either via a threaded spindle with threads arranged in different directions or else, for example, via a conveyor belt guided around at least two deflection rollers, whereby the deflection takes place between the two deflection rollers and the individual support elements are respectively coupled to different regions of the conveyor belt the distance is preferably half a conveyor belt length in the circumferential direction. Each movement of the conveyor belt in one direction causes a corresponding adjustment movement on the respective support element, wherein the adjusting movement takes place synchronously due to the mechanical positive coupling.

Finally, it can be provided with advantage that a pressing element is used, which is designed and arranged to be suitable to receive by means of a receiving and positioning a front cover and to position against the web roll, the at least one contact surface preferably by means of a heater is heated.

In this way, the device is particularly well suited for coping with high cycle times in the entire packaging process, since the end covers are securely fed and can be done directly on site heating of an optional, thermoplastic adhesive. Thus, different work phases are superimposed. In addition to lower investment costs due to a smaller number of individual elements, in particular a front cover holding device and a Stirndeckelbeheizvorrichtung, also significantly lower production costs.

Figur 1:

vereinfachte Seitenansicht einer erfindungsgemäßen Vor- richtung in Verbindung mit einem klassischen Antriebskon- zept

Figur 2:

vereinfachte Seitenansicht einer erfindungsgemäßen Vor- richtung in Verbindung mit einem geteilten Antriebskonzept

Figur 3:

Funktionsschema einer bevorzugten Ausführung einer An- presseinheit

The solution according to the invention is explained below with reference to figures. It details the following:

FIG. 1:

simplified side view of a device according to the invention in conjunction with a classic drive concept

FIG. 2:

simplified side view of an inventive device in conjunction with a shared drive concept

FIG. 3:

Functional diagram of a preferred embodiment of an attachment unit

The FIG. 1 illustrates in a highly simplified representation of the basic structure and the basic operation of an inventive device 1 for attaching end covers 28, in particular outer end covers on the end faces 30 of a web roll 29. The device 1 comprises a roller bearing device 2, to which the respective web roll 29 during positioning and fastening the end cover 28 is positioned with respect to its longitudinal axis 31 in position. Depending on the design and arrangement of the device 1 for the packaging of web rolls 29, the web roll 29 can either be stationary and stationary during the fastening of the end cover 28 or can be set into a rotational movement. In both cases, the storage takes place on the outer circumference of the web roll 29 by resting on a support surface formed by the roller bearing 2. The device 1 comprises at least one pressing element 4 movable relative to an end face 30 of the material web roll 29 in the longitudinal direction x of the roller bearing device 2 and thus in the direction of the longitudinal axis 31 of the web roll 29. Depending on the design of the device 1, but not shown in detail here, only one Such pressing element 4 are provided, which is used successively with rotation of the web roll 29 about a perpendicular to the longitudinal axis 31 for pressing on both end faces 30 or are, as shown, according to a particularly advantageous embodiment two oppositely oriented end faces 30 in the longitudinal direction x of the roller bearing device 2 movable pressing elements 4 are provided. These are preferably in the form of disk-shaped or plate-shaped elements, in particular in the form of press shields, which optionally can additionally be heated by means of a heating device 7. Further, the pressing member 4 may be equipped with a receiving and positioning device 6 for safe handling and rapid fixation of the end cover 28.

According to this figure, both pressing elements have their own pack press drives 27 and can be controlled via a common control device 22. For signal distribution sensors are provided. In this case, the sensor 18 is suitable to inform about the position of the material web roll 29 to be packaged, while the sensor 19 is suitable for registering parameters, in particular support dimensions, very particularly in the x direction, and weight.
The pressing surfaces 5 of the pressing elements 4 can be equipped with end covers 28 and have receiving and positioning devices 6 for the temporary fixing of the end cover 28 to the contact surfaces 5. Furthermore, in the example shown, the pressing elements 4 have heaters 7 and are therefore suitable for forehead cover 28, which have a thermoplastic adhesion promoter, in particular PE, on a functional side, particularly comfortable and quick to process. For this purpose, the heating device 7 melts the thermoplastic bonding agent located on the side of the end cover 28 facing away from it, while the contact pressure element moves towards the end face 30 of a material web roll 29. In the subsequent pressing process is thus simultaneously a gluing or bonding of the packaging.

The two pressing elements 4 move simultaneously to the web roll 29. Meets the contact surface 5 of a contact element 4 the facing her end 30 of the web roll 29 to be packaged, forming an abutment 8 under construction of the reaction force F _R. For this purpose, a sensor 16 for detecting the contact pressure or the contact pressure F _A and a sensor 17 for detecting the reaction force F _{R are} each provided in this example on both sides of the web roll 29 to be packaged. The latter is expediently located approximately in the middle of the contact surface 5 of the pressing element 4. A positioning of the sensor 17 in the lower half of the contact surface 5 of the pressing member 4 may be useful in strongly fluctuating diameters of the web rolls 29 to be packaged. It is also conceivable, but not shown here, that the contact surface 5 of the contact pressure element 4 has a plurality of sensors 17 for detecting the reaction force F _R and these are expediently distributed over the contact surface 5.

In the FIG. 1 the mechanism provided for forming a respective abutment 8 is not explicitly shown. Conceivable would be an adjusting device for the support element 9, which electronically with at least one of the sensors 16, 17 for detecting the contact pressure / contact force F _A or the reaction force F _R corresponds and simultaneously or delayed the support member 9 against a suitable support surface adjusted or against this, for example pressed by the housing / frame 25 or the base 26 formed support surface. The design of the abutment 8 may be purely non-positively depending on the brought into operative connection pressing surfaces or form-locking portions, such as profiling of the abutment 8 serving pressing surfaces have. It is also conceivable that after detection of a previously definable trigger value of a prevailing in the pressing operation contact pressure / contact force F _A by means of the sensor 16 and the reaction force F _R then occurring by means of the sensor 17 via a triggering device 15, a releasable locking device 14 is activated. Such a device is in the reverse manner after falling below a specified or selectable minimum value of the contact pressure / contact force F _A and the reaction force F _R in the reverse manner again. Of course, it is sufficient per Anpresseinheit 3 one of the two sensors 16 or 17 to provide. However, the presented in the example shown arrangement is characterized by a particularly high process reliability and serves as an intuition of possible embodiments. Also conceivable for the formation of the respective abutment 8, a mechanism of the hand FIG. 3 will be described in more detail below.

The sensor 20 for detecting the performance characteristics of the respective drive 27 completes primarily the image for the higher-level control device 22 and is, like all sensors 16 to 21 shown in the embodiments with the control device 22 wirelessly connected. In particular, the sensor 20 can also serve to monitor the powers for the adjustment paths along the x-direction which are necessary in addition to the actual pressing process and can be used as a securing element against overstressing of a pack press drive 27. The actual adjustment paths can additionally, as shown, be detected by a sensor 21.

The FIG. 2 illustrates in a greatly simplified representation of the basic structure and the basic operation of an inventive device 1 in conjunction with a shared drive concept. A device 1 which has a split drive concept has the advantage that the drive 24 of the pressing element 4 comprises a support element 23 which is movable relative to a housing / frame 25, in particular guidable, and on which the contact pressure element 4 is mounted. The pack press drive 27 is preferably arranged and supported outside the guide of the support element 23, as shown. Indicates the device For both end faces 30 of the material web roll 29 to be packaged, individual pressing units 3 can be moved by a common pack press drive 27. In this way, a decoupling of the actual feed movement of the Anpresskrafterzeugung, so that the Packpressenantrieb 27 here only for generating the basic feed movement, over which the individual pressing elements 4 are moved in position relative to the end faces 30 of the web roll 29 to be packaged, free from the effect of Reaction forces F _{R can be maintained} on the contact force F _A , which leads to an increase in the availability of the Packpressenantrieb 27 forming components and a design of this drive 27 can be made free from the consideration of possibly supported reaction forces F _R. Also, the required drive power to drive the individual drives 24 of the pressing elements 4 can be reduced compared to conventional solutions.

The respective pressing unit 3 has a device for forming an abutment 8, wherein a trained abutment is adapted to releasably fix the support member 23 relative to the housing / frame 25. In the simplest case, this is a lever system is used, wherein the reaction force F _R acts on one side of the lever and on the other at least indirectly a locking force against the guide, for example a housing / frame 25 is generated by generating an actuating force of an actuating or adjusting device, wherein the lever acts directly or via further transmission means on the adjusting and / or actuating device. In this case, the locking force is always proportional to the contact pressure of the respective pressing element. 4

Likewise, a device 1, which has a split drive concept, also have a device for forming an abutment 8, the in FIG. 3 corresponds to described embodiment. FIG. 3 illustrates in a greatly simplified representation of the basic structure of a preferred embodiment of an Anpresseinheit 3, which has a common actuating device 10, here a common printing device for the contact pressure element 4 and the abutment 8 of the pressing.

This ensures that the formation of the abutment 8 is coupled to the increasing contact pressure P. Occasion for pressure buildup can be at least one sensor 17 for detecting the contact pressure / the contact force F _A , as in FIG. 1 is shown. In the illustrated embodiment, the signal to build up the pressure P after detection of a minimum return path of the pressing 4, which results in contact of the contact surface 5 of the contact pressure element 4 and an end face 30 of a web roll 29 to be packaged independently, given by a sensor 21. The sensor 21 may be part of a magnetostrictive displacement measuring system, for example, and is housed here protected in the housing region of the pressing unit 3. In the example shown, it gives a signal for opening a valve, which is not described in detail, which is shown here in the upper area of the printing device 10.

The illustrated embodiment is suitable depending on the valve used 12 / used valves 12 to provide a steadily or a discretely forming abutment 8 ready. If the pressure P building up in the pressure device 10 during the pressing process also acts directly on the abutment, that is, the valve or valves 12 are at least partially open when the pressure builds up, the pressure in the actuating device 11, here the pressure element, of the support element 9 increases steadily , Thus, the contact pressure between the support element 9 and its abutment, in the case shown, the housing / frame 25. An on this manner forming abutment 8 is proportional to the present pressure P of the adjusting device 10 and thus to the present contact pressure or to the present contact force F _A proportional. The ratio is determined by means of valve configurations and piston surfaces in the pressure devices 10 and 11. In this case, the valve positions can also be selected during the pressing process, in particular by means of the higher-level control device 22. Due to the variably adjustable pressure ratio, it is additionally possible to react actively to changes in the components which transmit the contact pressure, in particular wear on the support element, while maintaining a required braking force.

If delay elements are provided as outflow at the separate pressure chamber 11, for example in the form of suitable valves 13, the regression of the abutment 8 can be delayed with respect to the regression of the contact pressure / contact force F _A and / or with a delay.

In the case of a discretely forming and returning abutment 8, the formation of the abutment 8 after reaching a previously defined pressure P in the common printing device 10 in one or more steps.

Of the illustrated embodiments may be departed from in many ways without departing from the inventive idea.

LIST OF REFERENCE NUMBERS

1

Device for attaching end caps to web rolls

2

Role pad accessory

3

pressing unit

4

presser

5

Contact surface of the contact pressure element

6

Pick-up and positioning device on the pressing element

7

Heating device on the pressing element

8th

Abutment of the pressing element

9

supporting

10

Adjusting device, in particular printing device

11

Setting device, in particular pressure device for support element

12

Actuator, in particular check valve

13

Actuator, in particular drain valve

14

Detachable locking device

15

triggering device

16

Sensor for detecting the contact pressure / or the contact force

17

Sensor for detecting the reaction force

18

Sensor for detecting the position of the material web roll

19

Sensor for recording characteristics of the material web roll

20

Sensor for recording performance characteristics of the drive or drives

21

Sensor for detecting travel ranges

22

Control device

23

supporting member

24

Drive for pressing element

25

Housing / frame

26

foundation

27

Pack press drive

28

front cover

29

Web roll

30

Front side of a web roll

31

Longitudinal axis of a web roll

F _A

contact force

F _R

reaction force

P

print

X

Longitudinal direction of the device

Y

transversely

Z

height direction

Claims (17)

Method for fastening end covers (28) on an end face (30) of a web roll (29) by means of at least one pressing element (4) of a device (1) for fastening end covers (28) to web rolls (29), wherein the pressing element (4) the end cover (28) under pressure against the end face (30) of the web roll (29) applies,
characterized in that
an abutment (8) of the contact pressure element (4) is formed under the action of the reaction force (F _R ) caused by the contact pressure process. Method according to claim 1,
characterized in that
on both end faces (30) of the web roll (29) to be packaged by them respectively associated pressing elements (4) end cover (28) are pressed. Method according to claim 1 or 2,
characterized in that
the abutment (8) of the contact pressure element (4) off during pressure build-up and regresses during pressure reduction, in particular simultaneously to the course of the acting reaction force (F _R ). Method according to one of the preceding claims,
characterized in that
the regression of the abutment (8) of the pressing element (4) is delayed and / or delayed expires. Method according to claim 1 or 2,
characterized in that
the abutment (8) of the contact pressure element (4) discretely off and / or back again. Method according to one of the preceding claims,
characterized in that
the pressing element (4) and the abutment (8) of the contact pressure element (4) use at least one common setting device (10), in particular a common pressure device. Device (1) for fastening end covers (28) on a front side (30) of web rolls (29) with a roll layer device (2) with at least one longitudinal direction (x) of the roll layer device (2) opposite the end face (30) of the roll of web material (2). 29) movable pressing element (4) and at least one pack press drive (27),
characterized in that
the device (1) has a supporting element (9) which is suitable for forming an abutment (8) serving for the pressing element (4) under the action of the reaction force (F _R ) caused by the pressing operation against a stationary device, in particular a housing / Stand (25) or a foundation (26), releasably support. Device according to claim 7,
characterized in that
at least two such pressing elements (4) are provided per device (1), which can be assigned to the individual end faces (30) of the web of web material (29) which are directed away from one another. Device according to claim 7 or 8,
characterized in that
the support element (9) is non-positively and / or positively supported. Device according to one of claims 7 to 9,
characterized in that
the resistor required to form the abutment (8), or at least to initiate it, can be selected, in particular controlled or regulated. Device according to one of claims 7 to 10,
characterized in that
the support element (9) has at least one releasable locking device (14) or is in communication with at least one releasable locking device (14). Device according to one of claims 7 to 11,
characterized in that
a triggering device (15) is provided, via which the locking device (14) can be activated and / or deactivated again. Device according to one of claims 7 to 12,
characterized in that
Sensors (16, 17, 18, 19, 20, 21) are provided, by which at least one of the following parameters for controlling / regulating the device can be detected: - Position of the web roll to be packaged (29) - Characteristics of the web roll to be packaged (29) - Contact pressure / contact pressure (F _A ) Reaction forces (F _R ) - Performance characteristics of the drive or drives (24, 27) - travel paths Device according to one of claims 7 to 13,
characterized in that
the at least one pressing element (4) being movable, preferably guidable, is arranged on at least one support element (23) which is movable, preferably guidable, relative to the fixed device, in particular the housing / frame (25) or the foundation (26). Device according to one of claims 7 to 14,
characterized in that
the support element (23) can be moved by the pack press drive (27) and the at least one contact pressure element (4) has at least one separate drive (24). Device according to one of claims 7 to 15,
characterized in that
on both sides of the web roll (29) to be packaged in each case one, on one of the stationary device, in particular the housing / frame (25) or the foundation (26) opposite movable, preferably feasible, support member (23) movable, preferably feasible, arranged pressing member (4 ) is provided, wherein the two support elements (23) with the same pack press drive (27) are coupled. Device according to one of claims 7 to 16,
characterized in that
a pressing element (4) is used, which is designed and arranged to be suitable to receive a front cover (28) by means of a receiving and positioning device (6) and to position it relative to the material web roll (29), wherein the at least one contact surface ( 5) is preferably heated by means of a heating device (7).

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