EP1721712A1 - Rotary cutting device, method of disabling a rotary cutting device and method of operating a rotary cutting device - Google Patents

Abstract

The rotary cutting device (10) has a swiveling cutting roller (24) and a counter roller (44). A supporting ring (40,42) is provided for supporting the cutting roller at the counter roller. A lifting device (80) is provided for moving apart the cutting roller and the counter roller. Independent claims are also included for the following: (A) Method for disabling a rotary cutting device; and (B) Method for operating a rotary cutting device.

Description

The invention relates to a rotary cutting device, comprising a rotatably mounted cutting roller and a counter-roller, wherein for supporting the cutting roller on the counter-roller at least one support ring is provided.

The invention further relates to a method for decommissioning a rotary cutting device with a rotatably mounted cutting roller and a counter-roller.

Furthermore, the invention relates to a method for operating a rotary cutting device with a rotatably mounted cutting roller and a counter-roller.

Rotary cutting devices are for example from the EP 0 976 510 A2 , of the EP 1 180 419 A1 , of the EP 1 186 387 A2 or the EP 1 238 765 A2 known.

The invention has for its object to provide a rotary cutting device of the type mentioned, which has an increased freedom from interference.

This object is achieved according to the invention in the rotary cutting device mentioned above in that a lifting device is provided for moving apart cutting roller and counter roller apart.

Usually, the cutting roller is pressed against the counter roll to perform cutting operations. If the cutting roller is no longer driven, for example by a defined shutdown of a drive or by an emergency stop, then the contact pressure is reduced. As a result, sliding friction between the cutting roller and the counter roller is relevant, which can lead to increased wear. In addition, it can come to cold welding. The lifting device allows the cutting roller and the counter roller to move apart to prevent mechanical contact and thereby sliding friction. The solution according to the invention thus allows the wear to be reduced.

It is also possible, for example, for foreign bodies, such as metallic foreign bodies, to be contained in a material web to be cut. These can lead to increased wear of cutting a cutting device of the cutting roller. Such foreign bodies can in principle be detected by sensors. By a corresponding sensor signal, the lifting device can be controlled to move apart the cutting roller and the counter roller and thereby prevent contact of the foreign body with the cutting device. This also reduces the wear.

In particular, by the lifting device, the distance between the cutting roller and the counter roller can be increased so that no contact between the Cutting roller and counter roll longer exists. In particular, these then no longer touch each other. As a result, there is no longer any mechanical contact between the cutting roller and the counter roller and sliding friction is prevented.

In particular, the cutting roller and the counter roller are translationally movable away from each other by the lifting device to prevent sliding friction.

It is envisaged that the cutting roller and the counter roller are movable away from each other by the lifting device in the direction transverse to the axis of rotation of the cutting roller. As a result, the distance between the cutting roller and the counter roller can be increased in order to "lift" a mechanical contact.

In one embodiment, the counter roll is held translationally and the cutting roller is translationally movable by the lifting device relative to the counter roll. Such a rotary cutting device has a favorable structural design. As a result, for example, can easily press the cutting roller against the backing roll to have a biasing force for cutting operations. By the lifting device, the distance between the cutting roller and the counter roller can be increased against this biasing force.

It is alternatively also possible that the cutting roller is held in translation and the counter-roller is translationally movable relative to the cutting roller by the lifting device. In principle, it is also possible that both cutting roller and counter roller are translationally movable.

It is particularly advantageous if the lifting device can be activated in a controlled manner for moving apart cutting roller and counter roller. Initiation signals may then be provided to effect the movement apart. For example, an initiation signal may be coupled to a drive stop, an emergency stop of the rotary cutter, or a foreign object detection.

In particular, a lift device controller is coupled to a drive controller of the rotary cutter. If a drive is switched off (for example, when decommissioning the rotary cutter or in an emergency stop), then it can be achieved by a mutual movement of the cutting roller and the counter-roller relative to each other to prevent sliding friction. This allows a defined decommissioning or a defined emergency stop for the rotary cutting device even with large mass of the cutting roller (and thus large inertia) can be achieved. As a result, increased wear is avoided and the rotary cutting device can operate trouble-free. Even when reaching threshold values (for example, for the delay of the rotational movement of the cutting roller), the lifting device can be activated.

In particular, the lifting device control is coupled to a drive control of the cutting roller in order to obtain, for example, when switching off the drive or when exceeding / falling below a speed threshold or acceleration threshold or deceleration threshold of the cutting rollers (rotary) movement a defined disengagement.

It can also be provided that a lifting device controller is coupled to one or more sensors in order to be able to initiate a movement apart via a sensor signal.

For example, the lifting device controller is connected to one or more crop sensors. As a result, for example, a foreign body detection can initiate a movement apart.

It is advantageous if the lifting device can be activated by exceeding / falling below a threshold value for the speed and / or acceleration and / or deceleration of the cutting roller and / or counter-roller. In particular, the lifting device control is coupled to a drive control of the cutting roller or counter-roller, so that it can be monitored via the lifting device control, if a certain threshold value is exceeded, for example with respect to the delay of the rotational movement of the cutting roller or counter-roller to a lifting of cutting roller and Activate counter roll. In this way disturbances can be avoided.

It is advantageous if the lifting device can be activated by an emergency stop. As a result, a defined movement apart can also be achieved during emergency stop (the cutting roller or the rotary cutting device or a system comprising the rotary cutting device).

In particular, a drive for the cutting roller is provided, that is, the cutting roller is driven to perform cutting operations.

It is advantageous if the lifting device is supported on a machine frame. As a result, the lifting device can be realized in a structurally simple manner and accommodate space.

It is particularly advantageous if the lifting device has a force accumulator. It can then achieve a movement apart, even if, for example, the rotary cutter is no longer supplied with electrical energy. For example, the force accumulator is "biased" when the cutting roll and the backing roll are in their normal operating mode. For decommissioning (for example, triggered by an emergency stop) a "lock" is released in order to effect the movement apart.

It is advantageous if the cutting roller is mounted movable in translation. This can be achieved in a simple way a divergence.
It can thereby also easily exert a biasing force on the cutting roller in order to be able to press against the counter-roller.

In one embodiment, the cutting roller is arranged above the counter-roller with respect to the direction of gravity. This results in a simple structural design of the rotary cutting device.

In particular, the lifting device is designed so that the cutting roller can be lifted from the counter-roller in a lifting direction against the direction of gravity. A corresponding rotary cutting device can be realized in a structurally simple manner.

It is favorable if the lifting device has one or more resettable devices. As a result, can easily bring the cutting roller and the backing roll in a mode of operation for cutting operations and it can be achieved in a simple way a movement apart of cutting roller and mating roll.

For example, the lifting device comprises one or more elastic elements such as springs, which can also serve as energy storage. These springs are biased, for example, when the cutting roller is pressed onto the counter roll to perform cutting movements. If a "lock" of the elastic members is released, then they may, for example, press the cutting roller away from the backing roll to provide liftoff.

The lifting device may also include one or more pneumatic or hydraulic means to provide for movement of the cutting roller away from the backing roll.

It is advantageous if the at least one restorable device is biased on support of the cutting roller on the mating roll, that is, when a bias in the normal operating mode (cutting mode) is present. This provides an energy storage that can be used to automatically lift (without the need for additional power). In particular, this can be achieved in an emergency stop a defined withdrawal.

The aforementioned object is further achieved according to the invention in that the cutting roller and / or the counter-roller is associated with a braking device.

As a result, a defined deceleration of the cutting roller and / or the counter roller can be achieved, in particular even during an emergency stop.

Such a braking device or brake devices can cooperate with the lifting device described above, such cooperation is not mandatory.

By providing a braking device or braking devices, a drive for the cutting roller can be made simpler, as by a defined deceleration, a design for lower forces is possible.

For example, a brake controller is coupled to a drive controller of the rotary cutter. As a result, a defined braking can be achieved, for example, during a drive stop.

It is advantageous if a brake device control is coupled to a lifting device control of a lifting device for moving apart cutting roller and counter roller. As a result, in addition to lifting off the cutting roller and the counter roller relative to one another, braking of the cutting roller and counter roller can also be achieved.

In an advantageous embodiment, the braking device comprises at least one disc brake. As a result, a defined braking of cutting roller and / or counter roller can be achieved in a simple space-saving manner.

It is favorable if, for a cutting operation, the cutting roller can be pressed against the counter-roller. As a result, a defined contact pressure can be provided for a cutting process.

The aforementioned object is further achieved according to the invention that the cutting roller and / or the counter-roller is associated with a damping device by which the translational relative movement of the cutting roller and counter-roller is controllable.

Even in a normal operation mode (cutting mode) of a rotary cutter, there may be a problem that a material web is thickened in a certain range. This can lead to a separation of the cutting roller from the counter roll. Then, when subsequently a material area of "normal" thickness is transported by the rotary cutter, then the previously lifted cutting roller moves towards the counter roll. This can lead to a hard impact of the cutting roller on the counter roll and for compression of the at least one support ring. This in turn can lead to a hard striking a cutting device of the cutting roller to the mating roll. This leads to increased wear of cutting and can in the worst case too cause a destruction of a cutting edge. (Blade assemblies are often made of brittle materials such as carbide materials that are particularly susceptible to hard impact.)

The damping device ensures a controlled movement (in particular with regard to speed and / or acceleration / deceleration) between the cutting roller and the counter roller in order to prevent a hard impact. In particular, the Zubewegung slow to avoid a hard stop. This results in a reduced susceptibility to interference.

In particular, the damping device is adjusted so that the impact speed and the impact force of the cutting roller on the counter-roller is so small that substantially no additional compression of the at least one support ring takes place. As a result, a striking of a cutting device of the cutting roller is prevented from the counter roll.

It is advantageous if the damping device is designed so that a fast movement apart is possible in comparison to the movement of cutting roller and counter roller. As a result, for example, a lifting of the cutting roller of the counter-roll by a lifting device as described above is possible to prevent the sliding friction of the cutting roller and counter-roller.

In particular, the damping device is arranged between a machine frame and the cutting roller. About the machine frame, the damping device can be supported.

In particular, the damping device has at least one damping element in order to avoid a hard impact.

For example, a first damping element is connected to a first end side of the cutting roller and a second damping element is connected to a second end side of the cutting roller. The connection can be direct or indirect. For example, a damping element is connected to a bearing housing of the cutting roller, which is in communication with the corresponding end face. Over damping elements, which are arranged on opposite sides of the cutting roller, can be effectively avoided a hard striking.

In particular, the at least one damping element is an oil damper. This can be a simple and effective way to avoid a hard striking, with a rapid deceleration of the relative Zubewegung between cutting roller and counter-roll can be taken care of.

It is favorable if the at least one damping element is arranged on a lever arm. As a result, an effective adhesion can be achieved with an effective Wegvergößerung.

It is particularly advantageous if the at least one support ring is arranged on the cutting roller and a cutting device of the cutting roller in the radial direction relative to a rotation axis of the cutting roller is set back relative to a support surface of the at least one support ring, wherein the radial distance between the cutting device and the support surface is set in dependence on the modulus of elasticity of the at least one support ring, that the cutting device almost touches the counter-roller when exerting a biasing force acting between the cutting roller and the counter-roller. It is particularly advantageous if a cutting device and a cooperating with this cutting support means (effective range of the backing roll) are made at least in the region of its surface made of hard metal. Even in high-strength materials, for example in very strong aramid fiber nets or steel nets, then can perform a precise cut, with minimal wear of the cutting device occurs. Since there is the risk of breakage of the cutting device when using carbide for the cutting device and the cutting support, it is provided that the cutting device with respect to the axis of rotation of the cutting roller has a smaller radial extent than the support surfaces of the at least one support ring. The cutting device is thus reset in the unloaded state of the rotary cutting device in the radial direction relative to the support surface. The radial distance between the cutting device and the support surface is achieved as a function of the modulus of elasticity of the at least one support ring, that is, depending on the respective existing material elasticity of the support ring. When a biasing force between the cutting roller and the counter roll is exerted, the at least one support ring undergoes a radial deformation so that the radial extent of the at least one support ring is reduced with respect to the axis of rotation of the cutting roller as a function of the respective modulus of elasticity. The relative distance between the cutting device and the cutting support is selected in the unloaded state of the rotary cutting device such that the cutting device in loaded state (that is, upon exertion of biasing force) the mating roll almost touched, that is, the cutting device with minimal distance of the cutting support on the mating roll faces or slightly touched. Such a light touch ensures on the one hand a reliable cut and on the other hand, a breakage of the cutting device is avoided and avoided damage to the backing roll. The cutting edge reset is in the EP 1 168 387 A2 described, to which reference is expressly made.

Furthermore, it is advantageous if the cutting roller and / or the counter-roller is stretched in itself. As a result, an advantageous mode structure can be achieved. Such a tension is in the EP 1 238 765 A2 described, to which reference is expressly made.

The invention is further based on the object of providing a method for decommissioning a rotary cutting device with a rotatably mounted cutting roller and a counter-roller, by means of which the susceptibility to malfunction of the rotary cutting device can be reduced.

This object is achieved in that the cutting roller and the counter roll are moved translationally away from each other when decommissioning.

The advantages of the method according to the invention have already been described in detail in connection with the rotary cutting device according to the invention.

Further advantageous embodiments of the method according to the invention have also already been described in connection with the rotary cutting device according to the invention.

In particular, the cutting roller is lifted from the counter roll to prevent sliding friction between the cutting roll and counter roll. By lifting the contact with the foreign bodies can be avoided with a cutting device of the cutting roller.

For example, the movement apart is initiated by exceeding / falling below a threshold value for the rotational movement of the cutting roller and / or counter-roller. In particular, it is initiated by a drive stop of the cutting roller. It may also be initiated by an interfering signal, such as a foreign object detection signal.

It is advantageous if the cutting roller and / or the counter-roller are braked in their rotational movement by a braking device. As a result, a defined deceleration can be achieved.

The invention is further based on the object of providing a method for operating a rotary cutting device with a rotatably mounted cutting roller and a counter roller, by means of which a reduced susceptibility to malfunction of the rotary cutting device is achieved.

This object is achieved in that the supply of the cutting roller to the mating roll after lifting the cutting roller of the mating roll is controlled due to Schnittgut-influence by a damping device to prevent a hard abutment of the cutting roller on the mating roll.

The advantages of the method according to the invention have already been explained in connection with the rotary cutting device according to the invention.

Figur 1

eine schematische Vorderansicht eines Ausführungsbeispiels einer erfindungsgemäßen Rotationsschneidvorrichtung; und

Figur 2

eine Teilseitenansicht der Rotationsschneidvorrichtung gemäß Figur 1.

The following description of preferred embodiments is used in conjunction with the drawings for a more detailed explanation of the invention. Show it:

FIG. 1

a schematic front view of an embodiment of a rotary cutting device according to the invention; and

FIG. 2

a partial side view of the rotary cutter according to Figure 1.

An exemplary embodiment of a rotary cutting device according to the invention, which is shown in FIGS. 1 and 2 and designated therein by 10, comprises a machine frame 12. This machine frame 12 has, for example, a base 14, via which the rotary cutting device 10 can be set up on a base. At the bottom 14, portal-like supports 16, 18 are arranged, wherein a support 16, 18 comprises spaced, vertically extending pillars 20a, 20b.

The supports 16, 18 are connected by a crossbar 22.

On the machine frame 12, a driven cutting roller 24 is rotatably mounted about an axis of rotation 26, wherein for storage a corresponding bearing means 28 is provided.

The cutting roller 24 comprises a shaft 30, which is coupled to a drive 32 and in particular a drive motor. About the drive 32, the shaft 30 can be put into a rotational movement. The cutting roller 24 further comprises a storage area 34, via which the cutting roller 24 is supported on the bearing device 28 on the machine frame 12.

The cutting roller has a cylindrical portion 36 which is positioned between the posts 16, 18. This cylindrical portion 36 carries a cutting device 38 with cutting edges, the arrangement and formation of the cutting device 38 on the cylindrical region 36 being determined by the specific application (that is to say by the cutting contour to be achieved).

The cutting roller 24 includes a first support ring 40 and a spaced second support ring 42, via which the cutting roller 24 is supported in a cutting operation on a counter-roller 44. The support rings 40, 42 are rotationally symmetrical to the axis of rotation 26 arranged and formed. They have a cylindrical support surface 46, with which they act on the counter-roller 44 for support.

The cutting edges of the cutting device 38 are made of a hard metal, for example, at least in one surface area. For example, it may be a tungsten based sintered material with a cobalt based binder or may be a titanium carbide containing material.

It can also be provided that an active region 48 of the counter-roller 44 is made of a hard metal material at least in a surface region.

To carry out cutting operations, the cutting roller 24 can be pressed in a direction 50 against the counter-roller 44. For this purpose, corresponding adjusting devices 52a, 52b are provided, which are arranged, for example, at least partially on the traverse 22. By means of the adjusting devices 52a, 52b, for example, the cutting roller 24 can be pneumatically pressed against the counter roller 44 to provide a contact pressure. By means of the adjusting devices 52a, 52b, a biasing force can be exerted on the cutting roller 24.

It is envisaged that the cutting device 38 in the radial direction with respect to the axis of rotation 26 of the cutting roller 24 as a cutting tool relative to the support surface 46 of the support rings 40, 42 is reset (if the support rings 40, 42 are not elastically deformed). The radial distance between the cutting device 38 (that is, between the locations of the cutting device 38 with the greatest distance from the axis of rotation 26) and the support surface 46 of the support rings 40, 42 is adjusted depending on the modulus of elasticity of the support rings 40, 42 that the cutting device 38 at exercise a biasing force acting between the cutting roller 24 and the counter-roller 44 almost touches the effective area 48 of the counter-roller 44.

This solution is particularly advantageous if the cutting device 38 and the active region 48 of the counter-roller 44 that cooperates with it are made of hard metal at least in the region of their surface. It can then perform a precise cut, with only a minimal support of the cutting device 38 adjusts to the effective range 48. This in turn can increase the life.

Such a rotary cutting device is in the EP 1 186 387 A2 or in the US 2002/0029675 A1 described, to which reference is expressly made.

The cutting roller 24 is mounted translationally on the machine frame 12. This is indicated in FIG. 1 by the directional double arrow 54. It is a translational movement of the cutting roller 24 in the vertical direction and in the opposite direction 50 possible.

The counter-roller 44 is rotatably mounted on the machine frame 12 so as to be translationally fixed. A corresponding axis of rotation 56 is aligned parallel to the axis of rotation 26 of the cutting roller 24. In a cutting operation, the axes of rotation 26 and 56 are spaced by a distance D.

The active region 48 of the counter-roller 44 is cylindrical. The cutting roller 24 is supported with its support rings 40, 42 (wherein the support rings 40 and 42 are formed substantially equal) on the counter-roller 44 from.

The counter-roller 44 may be driven or freely rotatable.

For pivotal mounting of the counter roll 44 on the machine frame 12, a bearing device 58 is provided.

During operation of the rotary cutting device 10, a web of material to be cut between the cutting roller 24 and the counter-roller 44 is performed, wherein the cutting device 38 "periodically" acts on the clippings. It may happen that the cut material has a non-uniform thickness that the cutting roller 24 is lifted from the counter-roller 44 in the opposite direction to the direction 50. When the thickened portion of the material has passed through the rotary cutter 10, then the cutting roller 24 again moves toward the counter roll 44 due to the biasing force.

There is a damping device 60 is provided which serves to avoid hard abutment in the movement of the cutting roller 24 on the counter-roller 44.

The damping device 60 comprises, for example, a first damping element 62 and a second damping element 64, wherein these damping elements 62, 64 are arranged on or in the vicinity of one end articulated and in particular pivotable on the machine frame 12. A corresponding pivot axis 66 is aligned substantially parallel to the axis of rotation 26.

The damping elements 62, 64 are connected to a respective end face 68, 70 directly or via corresponding connection means 72 (Figure 2) articulated. Such a connection device 72 is designed in particular as a lever arm, that is to say a connection point 74 (FIG. 2) of the corresponding damping elements 62, 64, to which it is connected in an articulated manner to the connection device 72, lies at a distance from the axis of rotation 26 of the cutting roller 24 it is possible to achieve a greater possible displacement path and thus better force coupling.

The coupling of the damping elements 62, 64 to the end faces 68, 70 of the cutting roller 24 can be done for example via the bearing device 28.

The damping elements 62, 64 are designed for example as oil damper 76 (hydraulic damper) with a piston which can move linearly displaceable in a piston chamber.

The damping device 60 is supported on the machine frame 12 and the cutting roller 24. It is designed so that a rapid lifting of the cutting roller from the counter-roller 44 is possible, that is, such a lifting is not impeded by the damping device 60 substantially. The movement of the cutting roller 24 on the counter-roller 44 (with the risk of hard abutment) is controlled attenuated by the damping device 60 controlled, that is slowed down and delayed so that a hard striking is avoided. The damping elements 62, 64 are adjusted so that the impact speed of the cutting roller 24 on the Counter roll 44 is such that no significant additional compression of the support rings 40, 42 takes place.

As a result, the risk of hard abutment when setting the resetting of the cutting device 38 to the support surfaces 46 need not be considered.

When the cutting roller 24 moves toward the counter-roller 44, it is necessary, in particular, to work against the oil pressure of the oil dampers 76, which causes the corresponding damping. About oil damper can be a "fast" deceleration of the translational movement of the cutting roller 24 reach the counter-roller 44. For example, it is provided that a stop of the movement of the cutting roller 24 onto the counter-roller 44 takes place within at most one second.

The damping elements 62, 64 always have contact with the machine frame 12 and the cutting roller 24 via the connecting device 72.

During operation of the rotary cutting device 10, the cutting roller 24 rotates and supports itself via the support rings 40, 42 on the counter-roller 44. The cutting roller 24 is driven by the drive 32. The drive 32 is associated with a drive control 78, for example.

There may be the problem that when the drive 32 of the cutting roller 24 is turned off, it slides on the counter roller 44 due to the reduction of the pressing force of the cutting roller 24 on the counter roller 44. (Usually, the cutting roller 24 when switching off the drive 32 rotate due to their inertia.) Due to the inertia of the cutting roller 24, a stop of the rotation of the cutting roller 24 is not necessarily reached when switching off the drive 32 immediately. Due to the sliding friction of the cutting roller 24 on the counter-roller 44, the wear on the support rings 40, 42 is increased. There is also the risk of cold welding.

According to the invention, a lifting device 80 is provided, via which the cutting roller 24 and the counter-roller 44 can be moved apart in order to prevent sliding friction of the cutting roller 24 against the counter-roller 44. The lifting device acts to the effect that the distance between the axes of rotation 26 and 56 is increased so that the support rings 40, 42 no longer touch the counter-roller 44. As a result, the mechanical contact between the cutting roller 24 and the counter-roller 44 is avoided, so that no sliding friction can occur.

By the lifting device 80, the cutting roller 24 is lifted away from the counter-roller 44 against the biasing force of the adjusting devices 52a, 52b.

The lifting device 80 is supported on the machine frame 12 and the cutting roller 24 in order to lift them.

For this example, pneumatic elements or hydraulic elements or spring elements may be provided. For example, electromagnets may be provided.

It is basically advantageous if the lifting device comprises resettable devices such as springs, pneumatic or hydraulic devices. In particular, these devices are biased; in a normal cutting movement, the lifting device 80 is not effective, with the corresponding devices (indicated in Figure 2 by springs 82) in a non-activated operating position. Upon activation, the corresponding devices then act and lift the cutting roller 24 away from the backing roll 44. By biasing a power storage is provided for lifting.

As a result of the recoverability, it is possible, for example, to press the cutting roller 24 against the counter roller 44 again via the adjusting devices 52a, 52b in order to be able to return to the normal cutting operation.

The actuation of the lifting device 80 for moving away the cutting roller 24 is controllable by a lifting device controller 84. By this, the withdrawal of the cutting roller 24 of the counter-roller 44 can be initiated. In particular, a "lock" such as a mechanical or electromagnetic switch for a force accumulator is released by the lifting device controller 84 so that biased devices such as springs, pneumatic elements or hydraulic elements can act on the cutting roller 24 to lift it.

The lifting device controller 84 is in particular coupled to the drive control 78 such that an exceeding / falling below a threshold value for the rotational movement of the cutting roller 24 and in particular a Drive stop for the cutting roller 24 of the lifting device controller 84 is communicated. This can then initiate the withdrawal of the cutting roller 24. For example, the lifting device controller 84 is informed whether a threshold value for the speed and / or acceleration and / or deceleration of the cutting roller 24 has been exceeded or undershot. In principle, it is also possible for one or more threshold values to be stored in the lifting device controller 84 and to check them for exceeding / undershooting.

It is also advantageous if the lifting device controller 84 is coupled to an emergency stop device 86. It can then cause an automatic lifting of the cutting roller 24 when triggering an emergency stop for the rotary cutter 10.

It can also be provided that the lifting device controller 84 is coupled to one or more sensors 88. For example, the hoist control 84 is coupled to material sensors. For example, if a foreign body such as a metallic foreign body is detected in the material to be cut, then the cutting roller 24 can be automatically lifted by the counter roller 44 to prevent contact of the metallic material with the cutter 38.

The cutting roller 24 is associated with a braking device 90. This includes, for example, one or more disc brakes. If the cutting roller 24 is no longer driven by switching off the drive 32, then leaves to achieve a defined deceleration by the braking device 90. In particular, this makes it possible to achieve a faster stop of the rotation of the cutting roller 24. This can be a real "emergency stop" of the cutting roller 24 done.

The braking device 90 is coupled, for example, to the lifting device controller 84, or it may be coupled directly to the drive controller 78. It can also be coupled directly to the emergency stop device 86.

As a result, for example, with the lifting off of the cutting roller 24 from the counter roller 44, an automatic deceleration of the cutting roller 24 can be achieved.

Also, the counter roll 44 may be associated with a braking device 92, which includes, for example, one or more disc brakes. By the braking device 92, the rotation of the counter-roller 44 can be decelerated. In this case, a coupling to the lifting device controller 84 or directly to the drive control 78 or the emergency stop device 86 can again be provided. With the braking device 92, a defined braking of the counter-roller 44 can be achieved in order to prevent, for example, a rolling up of a material web.

The cutting roll 24 (and also the counter roll 44) may be biased inwardly (and preferably substantially parallel to the axis of rotation 26) to obtain a favorable mode structure with respect to vibrations of the cutting roll 24. This is in the EP 1 238 765 A2 and in the US 2002/0144580 A1 described, to which reference is expressly made.

The rotary cutter according to the invention functions as follows:

During normal operation (cutting operation) of the rotary cutter 10, a web of material between the cutting roller 24 and the counter roller 44 is performed. The cutting roller 24 is pressed with a certain biasing force (set by the adjusting means 52a, 52b) on the counter-roller 44. The cutting whale 24 rotates driven and brings contour cuts in the web.

If due to a material thickening the cutting roller 24 is lifted from the counter-roller 44 and then moves back to the counter-roller 44, then the damping device 60 prevents a hard striking, that is, the cutting roller 24 is due to the damping device 60 at a reduced speed on the counter-roller 44th too moved. As a result, in particular a deflection of the support rings 40, 42 is prevented, which could lead to that the cutting device 38 "hard" abuts the active region 48.

When decommissioning the rotary cutting device 10 (either by deliberate decommissioning or an emergency stop) the cutting roller 24 is lifted from the counter roll 44 via the lifting device 80 to cancel the mechanical contact between the cutting roller 24 and the counter roll 44. As a result, the sliding friction between the cutting roller 24 and the counter-roller 44 (on the support rings 40, 42) is avoided.

About the braking devices 90, 92 can be a defined deceleration of the cutting roller 24 and the counter roll 44 reach.

Even with cutting rollers 24 and counter-rollers 44 with large mass and thus high inertia can be at the decommissioning of the rotary cutter 10, the sliding friction between cutting roller 24 and counter-roller 44 avoid. By the braking devices 90, 92 can achieve a defined deceleration.

Trouble-free operation can also be achieved by carrying out a foreign body detection on a material web via one or more sensors 88 and removing the cutting device 38 from the material web if such a foreign body is detected before it reaches the cutting device 38.

In the case of the rotary cutting device 10 according to the invention, the drive 32 can be dimensioned smaller, since a defined decommissioning is ensured; The drive 32 must in principle withstand the forces acting on the emergency stop, which are greater with a larger mass. By the braking device 90, these forces can be reduced. Furthermore, these can be reduced by the withdrawal.

Claims (46)

Rotary cutting device, comprising a rotatably mounted cutting roller (24) and a counter-roller (44), wherein for supporting the cutting roller (24) on the counter-roller (44) at least one support ring (40; 42) is provided,
characterized in that a lifting device (80) for moving apart cutting roller (24) and counter-roller (44) is provided. Rotary cutting device according to claim 1, characterized in that by the lifting device (80), the distance between the cutting roller (24) and the counter-roller (44) is increased so that no contact between the cutting roller (24) and counter-roller (44) exists more. Rotary cutting device according to claim 1 or 2, characterized in that the cutting roller (24) and the counter-roller (44) by the lifting device (80) are translationally movable away from each other. Rotary cutting apparatus according to one of the preceding claims, characterized in that the cutting roller (24) and the counter-roller (44) by the lifting device (80) in a direction transverse to the rotational axis (26) of the cutting roller (24) are movable away from each other. Rotary cutting device according to one of the preceding claims, characterized in that the counter-roller (44) is held translationally and the cutting roller (24) by the lifting device (80) relative to the counter-roller (44) is translationally movable. Rotary cutting device according to one of claims 1 to 4, characterized in that the cutting roller is held in translation and the counter-roller is translationally movable relative to the cutting roller by the lifting device. Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) for the movement apart of cutting roller (24) and counter-roller (44) is activated activated. Rotary cutting apparatus according to claim 7, characterized in that a lifting device controller (84) is coupled to a drive control (78) of the rotary cutting device. Rotary cutting apparatus according to claim 8, characterized in that the lifting device controller (84) to a drive control (78) of the cutting roller (24) is coupled. Rotary cutting apparatus according to any one of claims 7 to 9, characterized in that a lifting device controller (84) is coupled to one or more sensors (88). Rotary cutting apparatus according to claim 10, characterized in that the lifting device controller (84) is connected to one or more crop sensors (88). Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) can be activated by exceeding / falling below a threshold value for the speed and / or acceleration and / or deceleration of the cutting roller (24) and / or counter-roller (44). Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) can be activated by an emergency stop. Rotary cutting device according to one of the preceding claims, characterized in that a drive (32) for the cutting roller (24) is provided. Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) is supported on a machine frame (12). Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) has a force accumulator. Rotary cutting device according to one of the preceding claims, characterized in that the cutting roller (24) is mounted so as to be movable in translation. Rotary cutting device according to one of the preceding claims, characterized in that the cutting roller (24) with respect to the direction of gravity above the counter-roller (44) is arranged. Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) is formed so that the cutting roller (24) of the counter-roller (44) in a lifting direction against the direction of gravity can be lifted. Rotary cutting device according to one of the preceding claims, characterized in that the lifting device (80) has one or more resettable devices. Rotary cutting device according to claim 20, characterized in that the lifting device (80) has one or more elastic elements. Rotary cutting device according to claim 20 or 21, characterized in that the lifting device (80) comprises one or more pneumatic devices. Rotary cutting device according to one of claims 20 to 22, characterized in that the lifting device (80) has one or more hydraulic devices. Rotary cutting device according to one of claims 20 to 23, characterized in that the at least one recoverable device is biased upon support of the cutting roller (24) on the counter-roller (44). Rotary cutting device according to the preamble of claim 1 or one of the preceding claims, characterized in that the cutting roller (24) and / or the counter-roller (44) is associated with a braking device (90; 92). Rotary cutting apparatus according to claim 25, characterized in that a braking device control is coupled to a drive control (78) of the rotary cutting device. Rotary cutting apparatus according to claim 25 or 26, characterized in that a braking device controller is coupled to a lifting device controller (84) of a lifting device (80) for moving the cutting roller (24) and counter-roller (44) apart. Rotary cutting device according to one of claims 25 to 27, characterized in that the braking device (90; 92) comprises at least one disc brake. Rotary cutting device according to one of the preceding claims, characterized in that for a cutting operation, the cutting roller (24) against the counter-roller (44) can be pressed. Rotary cutting device according to the preamble of claim 1 or one of the preceding claims, characterized in that the cutting roller (24) and / or the counter-roller (44) is associated with a damping device (60) through which the translational relative movement of the cutting roller (24) and Counter roll (44) is controllable. Rotary cutting apparatus according to claim 30, characterized in that the damping device (60) is adjusted so that the impact speed and the impact force of the cutting roller (24) on the counter-roller (44) is so small that no additional compression of the at least one support ring (40; 42). Rotary cutting device according to claim 30 or 31, characterized in that the damping device (60) is designed so that in comparison to the movement of the cutting roller (24) and counter-roller (44) rapid movement apart is made possible. Rotary cutting device according to one of claims 30 to 32, characterized in that the damping device (60) between a machine frame (12) and the cutting roller (24) is arranged. Rotary cutting device according to one of claims 30 to 33, characterized in that the damping device (60) has at least one damping element (62; 64). Rotary cutting apparatus according to claim 34, characterized in that a first damping element (62) with a first end face (68) of the cutting roller (24) is connected and a second damping element (64) with a second end face (70) of the cutting roller (24) is connected , Rotary cutting device according to claim 34 or 35, characterized in that the at least one damping element (62; 64) is an oil damper (76). Rotary cutting device according to one of claims 34 to 36, characterized in that the at least one damping element (62; 64) is arranged on a lever arm. Rotary cutting device according to one of the preceding claims, characterized in that the at least one support ring (40; 42) is arranged on the cutting roller (24) and a cutting device (38) of the cutting roller (24) in the radial direction with respect to an axis of rotation (26) The radial distance between the cutting device (38) and the support surface (46) so depending on the modulus of elasticity of the at least one support ring (40. 42) is reset relative to a support surface (46) of the at least one support ring (40; 42) is set so that the cutting device (38) upon application of a between the cutting roller (24) and the counter-roller (44) acting biasing force almost touches the counter-roller (44). Rotary cutting device according to one of the preceding claims, characterized in that the cutting roller (24) is tensioned in it. A method for decommissioning a rotary cutting device with a rotatably mounted cutting roller and a counter-roller, wherein the cutting roller and the counter-roller are translationally moved away from each other. A method according to claim 40, characterized in that the cutting roller is lifted from the counter roll. A method according to claim 40 or 41, characterized in that the movement apart is initiated by exceeding / falling below a threshold value for the speed and / or acceleration and / or deceleration of the cutting roller and / or counter-roller. Method according to one of claims 40 to 42, characterized in that the movement apart is initiated by an interference signal. Method according to one of claims 40 to 43, characterized in that the cutting roller is braked in its rotational movement by a braking device. Method according to one of claims 40 to 44, characterized in that the counter-roller is braked. Method for operating a rotary cutting device with a rotatably mounted cutting roller and a counter-roller, wherein the movement of the cutting roller is controlled on the counter-roller after removal of the cutting roller from the counter-roller due to Schnittgut-influence by a damping device to a hard abutment of the cutting roller to the counter-roller prevent.

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