Cutting blade assembly and packaging material cutting device

Abstract

Cutting knife arrangement for a device for cutting packaging material, the cutting knife arrangement comprising at least one cutting knife unit with a cutting knife rotatably mounted about an axis of rotation and a movably arranged stripper associated with the cutting knife for stripping packaging material from the cutting knife, wherein the stripper can be moved between a stripping position and a locking position, wherein the stripper can strip packaging material from the cutting knife in the stripping position and the stripper extends radially from the axis of rotation beyond the cutting knife in the locking position.

Description

[0001] The present invention relates to a cutting blade arrangement for a device for cutting packaging material according to claim 1 and to a device for cutting packaging material according to claim 11. State of the art

[0002] Cutting knife arrangements and devices for cutting packaging material are well known in the art.

[0003] Devices for cutting packaging material typically comprise a transport device in which packaging material (e.g., a plastic film) is transported along a transport direction and fed to a cutting device. The cutting device comprises a lower blade assembly and a cutting blade assembly that together can cut packaging material. It is known to implement both line cuts and strip cuts, with strip cuts being created by pairs of slightly spaced cutting blades (e.g., 1 cm apart in a direction parallel to the rotation axis of the cutting blades), which cut the packaging material by separating a strip of packaging material between the cutting blades.

[0004] During maintenance work or due to malfunctions, it may be necessary to remove the cutting blade assembly from the device. Since the cutting blades must be exposed, at least in the direction of the packaging material, to cut the packaging material from above (in interaction with the lower blade assembly), this poses a risk of injury to the operator.

[0005] In addition, strip cutting requires the removal of the resulting material strips. For this purpose, a stripping body or ring is arranged between the adjacent cutting blades, as in DE 3 841 250 C2, for example, along which the material strip can be guided and moved to an extraction device or extraction pipe. Task

[0006] Based on the known state of the art, the technical problem to be solved is to achieve a reliable removal of packaging material strips during strip cutting and, at the same time, a high operational reliability of a cutting knife arrangement and a device for cutting packaging material. Solution

[0007] This object is achieved according to the invention by the cutting blade arrangement for a device for cutting packaging material according to claim 1 and the device for cutting packaging material according to claim 11. Advantageous developments of the invention are covered in the subclaims.

[0008] The cutting knife arrangement according to the invention for a device for cutting packaging material comprises at least one cutting knife unit with a cutting knife mounted so as to be rotatable about a rotation axis and a movably arranged stripper assigned to the cutting knife for stripping packaging material from the cutting knife, wherein the stripper can be moved between a stripping position and a securing position, wherein the stripper can strip packaging material from the cutting knife in the stripping position and the stripper extends beyond the cutting knife in the securing position in the radial direction from the rotation axis.

[0009] The stripper can be designed, for example, as a frame or a flat metal structure (measured in a direction parallel to the rotation axis, for example, up to 2 mm, up to 5 mm, or up to 7 mm thick) with or without a contour. At least in the stripping position, it can be spaced from the cutting blade in a direction parallel to the rotation axis by up to 5 mm, up to 3 mm, up to 2 mm, or less than 2 mm. This distance can be identical, smaller, or larger in the locking position, but is preferably no more than 3 mm.

[0010] The cutting blade arrangement according to the invention enables the stripper to be used both to ensure reliable removal of strips of packaging material from the cutting blade and to provide a safety function for the stripper when handling the cutting blade arrangement, so that the risk of injury to the operator due to cuts from the cutting blades is low, but at the same time a reliable removal of material is achieved with comparatively low component usage.

[0011] It can be provided that the cutting blade is arranged to be movable between a working position for cutting packaging material and a rest position, and wherein the stripper in the securing position extends in the radial direction from the axis of rotation beyond the cutting blade in the rest position, and wherein the stripper in the stripping position can strip packaging material from the cutting blade in the working position.

[0012] In this embodiment, a simplified removal of the cutting knife unit and / or the entire cutting knife arrangement from a device for cutting packaging material can be ensured, whereby the operational safety for an operator is increased.

[0013] It can be provided that the cutting blade and the stripper are designed to be movement-coupled. The movement-coupled design of the cutting blade and the stripper is to be understood in particular that a movement of the cutting blade either leads to a movement of the stripper or vice versa, or that the cutting blade and the stripper are arranged to be movable and optionally connected to one another in such a way that their movement occurs at least partially together. The cutting blade and stripper do not have to undergo the same movement (in the sense of a movement path in space), but can also travel different paths, although the cutting blade preferably assumes its working position at the same time as the stripper's stripping position, and the cutting blade preferably assumes its rest position at the same time as the stripper's securing position.This means, in particular, that the movement of the scraper between the stripping position and the safety position takes place at the same time as the movement of the cutting blade between the working position and the rest position. This increases operational reliability.

[0014] The cutting blade unit may comprise exactly one cutting blade and the stripper may be arranged spaced from the cutting blade in a direction parallel to the rotation axis, or the cutting blade unit may comprise two cutting blades arranged concentrically and spaced from each other along the rotation axis, and the stripper may be arranged between the two cutting blades.

[0015] The first alternative increases operational safety, as the scraper prevents operator intervention in a direction perpendicular to the cutting blade's rotation axis. The second alternative also ensures reliable material removal.

[0016] The cutting blade assembly may comprise at least two cutting blade units. This allows the cutting blade assembly to be used reliably in devices for cutting packaging material, in which the packaging material is to be cut into a plurality of parallel strips.

[0017] In one embodiment, it is provided that each cutting knife unit is assigned an actuating element of the cutting knife arrangement for effecting a movement of the cutting knife into a working position for cutting packaging material and / or of the stripper into the stripping position, or that the cutting knife arrangement comprises a common actuating element for effecting a movement of the cutting knives into the working position and / or of the strippers into the stripping position of at least two cutting knife units.

[0018] In the first embodiment, isolated replacement of the cutting blade units or work on the individual cutting blade units is possible with a low risk of injury. The second alternative allows simultaneous movement of the cutting blades of the cutting blade arrangement between the working position and the rest position, and of the strippers between the securing position and the stripping position. In this context, it is understood that the respective actuating elements can enable not only movement of the cutting blades from the rest position to the working position, or of the strippers from the securing position to the stripping position, but also from the working position or the stripping position to the rest position or the securing position. Overall, this design increases operational reliability.

[0019] It can be provided that a detection element is connected to the actuating element or the common actuating element, wherein the detection element, in an installed state of the cutting knife arrangement, can actively or passively signal the installed state and / or wherein the detection element can bring about a movement of the actuating element or the common actuating element. Active signaling can in particular comprise the detection element being designed as a transmitter for emitting an electromagnetic signal (e.g. by means of wired or wireless signal transmission) or as comprising such a transmitter and can hereby transmit a signal indicative of the installed state, for example to a control unit of a device for cutting packaging material in which the cutting knife arrangement is to be used. Passive signaling can, for example,include that the detection element, in the installed state of the cutting blade arrangement, makes (physical) contact with another corresponding contact element of the device and that this contact element is actuated by contact of the detection element in order to emit a corresponding signal for the installed state.

[0020] The fact that the detection element can cause a movement of the actuating element or the common actuating element can, in particular, include the detection element being physically connected to the actuating element or the common actuating element, so that a movement of the detection element upon assuming the installed state is translated by the cutting blade assembly into a movement of the actuating element or the common actuating element. This embodiment further increases operational reliability.

[0021] The cutting blade unit may be provided with a preloading element for preloading the stripper into the locking position. This ensures that the cutting blade of the cutting blade unit is always protected by the stripper, thus minimizing the risk of injury to an operator when the stripper is not actively moved into the stripping position.

[0022] It can be provided that the scraper undergoes a rotational movement about an axis parallel to the rotational axis when moving between the stripping position and the securing position, and / or that the scraper undergoes a linear movement in a plane perpendicular to the rotational axis when moving between the stripping position and the securing position. By appropriately adjusting the spatial movement, for example, the cutting blade arrangement can be made more compact or the movement amplitude of the scraper can be kept as small as possible, which can simplify the design of the cutting blade arrangement while simultaneously ensuring high operational reliability.

[0023] The cutting blade assembly may include a guide, and the cutting blade unit may be arranged to be movable along the guide in a direction parallel to the rotation axis. This increases the flexibility of the cutting blade assembly.

[0024] According to the invention, a device for cutting packaging material is further provided, wherein the device comprises a transport device for transporting packaging material and a cutting device comprising a lower blade assembly and a cutting blade assembly according to one of the embodiments described here, and wherein the cutting blade assembly and the lower blade assembly can cooperate to cut packaging material. This device can be operated reliably, while at the same time, for example, the risk of injury to an operator is minimized, for example, during maintenance work.

[0025] The cutting blade assembly can be detachably connected to a frame of the device. This design ensures reliable replacement of the cutting blade assembly.

[0026] In one embodiment, it is provided that a detection element of the cutting blade arrangement can come into contact with a contact element of the device in an installed state of the cutting blade arrangement and can actuate an actuating element of the cutting blade arrangement to effect a movement of the cutting blade into the working position and / or of the stripper into the stripping position, or that a detection element of the cutting blade arrangement can come into contact with a contact element of the device in an installed state of the cutting blade arrangement and can actuate a common actuating element of the cutting blade arrangement to effect a movement of the cutting blades into the working position and / or of the stripper into the stripping position of at least two cutting blade units. This can ensure more reliable operation while at the same time allowing the operator to easily adjust the working position of the cutting blades.

[0027] The device may include a strip suction system for suctioning a strip of material from a cutting blade unit. This reliably ensures the removal of material strips during strip cutting.

[0028] All described embodiments can be combined with each other. Short description of the characters

[0029] Figure 1 shows a schematic view of a device for cutting packaging material. Figure 2 shows an embodiment of a cutting blade unit. Figure 3 shows another embodiment of a cutting blade unit. Figures 4 to 6 show embodiments for transferring the stripper from a stripping position to a securing position. Figure 7 shows an embodiment of a stripper with a pretensioning element. Figure 8 shows an embodiment of a cutting blade unit with an actuating element. Detailed description

[0030] Fig. 1shows an embodiment of a device 100 for cutting packaging material 130. Devices for cutting packaging material are generally known from the prior art and are used, for example, in the food industry or the packaging industry in general to separate packaging material, for example in the form of flat plastic films or already formed but still connected packaging components (such as packaging trays).

[0031] Basically, two options for separating or cutting the packaging material 130 are known. One option involves severing adjacent pieces of packaging material, and the second option involves the so-called "strip cut," in which the continuous packaging material is separated by removing a strip of packaging material. The device according to the invention can basically be used with both variants.

[0032] Fundamentally, the device 100 in the embodiment shown is designed to transport the packaging material 130 along a transport direction T. During this process, the packaging material 130 passes through a cutting arrangement 113 comprising a lower blade arrangement 101 and a cutting blade arrangement 102. The lower blade arrangement 101 is known to comprise at least one, preferably a row of, lower blades 111. These can, but do not have to, be designed as cutting elements that can sever the packaging material 130. Alternatively, the lower blades 111 can also be designed as counterpressure elements, which are, for example, mounted so as to be rotatable about a rotation axis and can interact with the cutting blades of the cutting blade arrangement 102 such that the packaging material is severed.

[0033] The cutting blade assembly 102 may include at least one cutting blade unit 121. The cutting blade unit 121 includes at least one cutting blade that is rotatably mounted about a rotation axis and can interact with the lower blade 111 corresponding to this cutting blade such that packaging material 130 is cut thereby.

[0034] To drive the cutting blades of the cutting blade arrangement 102, a drive unit 122 can be provided, for example in the form of a drive shaft extending through the cutting blades of the cutting blade arrangement 102 or a drive shaft spaced from the axis of rotation of the cutting blades of the cutting blade arrangement 102, which can be operatively connected to the respective cutting blades, for example via a gear and in particular via a gear wheel rotatable about the axis of rotation of the cutting blade, so that the cutting blades can be set in rotation.

[0035] Alternatively, it can also be provided that at least one or more or each cutting blade unit 121 of the cutting blade arrangement 102 comprises an independent drive element that can cause the respective cutting blade to rotate about its axis of rotation. If a common drive element is provided for the cutting blades of the cutting blade arrangement 102 (for example in the form of a common drive shaft), this allows for a speed-synchronous movement of the cutting blades in a structurally simple manner. The provision of individual drive units (e.g., an electric motor, in particular a servo motor) enables separate control of the individual cutting blades and can, for example, also be advantageously used to selectively cut or not cut portions of packaging material.

[0036] The cut strips 131 to 134 of packaging material 130 can then be transported away and, for example, used for other purposes.

[0037] The device 100 may further comprise a frame 104, which may be configured as a transport device for the packaging material 130. This may be configured in a known manner to feed packaging material, for example in the form of an "endless material strip," from a roll of packaging material to the device and / or to remove the strips 131 to 134 from the device.

[0038] Furthermore, the device 100 can comprise a control unit 180, which can be configured, for example, as a computer or another generally known central control unit of a device for cutting packaging material and can control one or more functions of the device. In particular, it can be provided that the control unit 180 enables the operation of the device 100 only when the cutting blade arrangement 102 is correctly positioned, as will be explained below.

[0039] The invention is not limited with regard to the packaging material 130 to be cut. In particular, it can be plastic film or plastic composite film. Combinations of plastic and paper, or packaging material consisting of paper or other organic and / or inorganic equivalents, are also conceivable.

[0040] In the Figure 1In the embodiment shown, the lower blade assembly 101 comprises three cutting blades, and the cutting blade assembly 102 also comprises three cutting blades or three cutting blade units 121, each of which can comprise up to two cutting blades (in the case of strip cutting, each cutting blade unit comprises two cutting blades and otherwise one cutting blade). The invention is not limited with regard to the number of cutting blade units provided on the cutting blade assembly 102 or the lower blades 111 on the lower blade assembly 101. More or fewer cutting blade units or lower blades can also be provided, although the number of lower blades 111 is preferably equal to the number of cutting blade units 121 of the cutting blade assembly.

[0041] Figure 2 shows an embodiment of a cutting blade unit 121 of the cutting blade arrangement 102, as used in connection with Figure 1described. This is shown here isolated from the other cutting blade units (if provided) of the cutting blade arrangement. The cutting blade unit 121 can optionally be mounted together with the other cutting blade units of the cutting blade arrangement on a guide 270 and arranged to be movable relative thereto in a direction parallel to the rotational axis D of the cutting blades of the cutting blade unit 121. However, this is not mandatory, and the cutting blade unit can also be arranged fixedly on the guide 270.

[0042] The cutting blade unit 121 may comprise a body 250, on or in which the remaining components of the cutting blade unit are arranged. In this embodiment, the cutting blade unit 121 comprises two cutting blades 221 and 222, which are rotatably mounted about a common rotation axis D. The drive may be provided either via a drive unit in the cutting blade unit (for example, in the body 250) or, as in connection with the Figure 1 As already described, this can be done via a separate drive device, such as a common drive shaft for all cutting blade units.

[0043] In this embodiment, the two cutting blades 221 and 222 are spaced apart from each other. A distance adjustment unit (not shown here) can be provided as part of the cutting blade unit 121, with which the distance between the cutting blades 221 and 222 can be adjusted. This allows the distance between the cutting blades 221 and 222 and thus the width of the strip of material cut from the packaging material by the blades to be adjusted.

[0044] Furthermore, in this embodiment, the cutting blade unit 121 comprises a stripper 223, which is arranged here between the cutting blades 221 and 222 at a distance Q 1 or Q 2 from the respective cutting blade. The stripper 223 has a shape and is arranged such that, in a working position of the cutting blades 221 and 222, when the stripper assumes a stripping position, it is arranged such that a strip of packaging material cut out by the cutting blades 221 and 222 is guided by the stripper and, for example, to a strip suction device (see Figure 4 ) which can remove the strip of material.

[0045] The wiper 223 can, for example, be designed as a sheet metal which is arranged and shaped in such a way that it is located between a Figures 4 to 6 can be moved back and forth in the stripping and securing position described below.

[0046] Figure 3 shows a Figure 2alternative embodiment. Here, too, the cutting blade unit 121 is optionally movably arranged on the guide 270. The remaining components of the cutting blade unit 121 also correspond to the Figure 2 described, whereby in the Figure 3 In the embodiment shown, exactly one cutting blade 324 is provided in the cutting blade unit 121, which is arranged adjacent to the stripper 325 at a distance Q 3 and is rotatably mounted about the rotation axis D.

[0047] The cutting blade and the scraper are again arranged on or in the body 350 of the cutting blade unit 121.

[0048] The distances Q 1 , Q 2 , and Q 3 can, in principle, be chosen arbitrarily. If a strip cut is intended, the distances Q 1 and Q 2 are preferably selected such that their sum, together with the extension of the stripper 223 in the direction of the rotation axis D, corresponds to the width (measured transversely to the transport direction T of the packaging material) of the strip to be cut out. The distance Q 1 , Q 2 , and Q 3 is preferably less than 0.5 cm, more preferably less than 3 mm, and most preferably less than 2 mm. This places the cutting blade as close as possible to the stripper, which can reduce the risk of injury to an operator.

[0049] In Figure 4 a cutting blade unit 121 is shown in a side view, wherein the image plane is perpendicular to the rotational axis D of the cutting blade 402 of the cutting blade unit 121.

[0050] Analogous to the Figures 2 and 3The cutting blade unit 121 comprises a body 450 in or on which the stripper 401 and the cutting blade 402 (at least one) are arranged. The embodiment shown here can be used with the embodiments of the cutting blade unit according to Figure 2 as well as with the designs of the cutting blade unit according to Figure 3 be realized.

[0051] The embodiment shown here also includes an optional strip suction device 460, which is arranged in the area of ​​the stripper 401 and the cutting blade 402 so that it can suction off a strip of material 431 that has been removed from the packaging material. The packaging material 130 and the associated lower blade 111 are shown for illustrative purposes only.

[0052] In the Figure 4In the view shown, the cutting blade 402 is arranged or positioned in a working position in which it can cut packaging material together with the lower blade 101. The stripper 401 is arranged or positioned in its stripping position in the embodiment shown, so that it can feed the material strip removed by the cutting blade 402 and the lower blade 111 to the suction device 460. If a cutting blade unit 121 is arranged or positioned accordingly Figure 3If provided, it can be envisaged that the stripper 401 can assume a corresponding "stripping position," which then does not allow stripping of a material strip in the direction of a strip suction device 460, but at least has a distance from the cutting edge of the cutting blade 402 pointing in the direction of the lower blade 111, which distance assumes a value h. This value can be 1 mm, 2 mm or more, for example, up to 5 mm or up to 10 mm, and enables the cutting blade 402 to reliably cut through the packaging material 130 while simultaneously preventing the packaging material 130 from dragging against the stripper.

[0053] As already described, at least the scraper 401 is movably arranged in the cutting blade unit, in particular the body 450.

[0054] Figure 5 shows how the stripper 501 moves from the stripping position ( Figure 4) can be brought into a securing position in which it preferably completely surrounds the cutting blade in the plane shown here, or extends beyond the cutting blade in the radial direction from the rotational axis D (but in a direction parallel to the rotational axis D according to the embodiments of the Figures 2 and 3 to the cutting blade). In the embodiment shown here, compared with the embodiment of the Figure 4 not only the scraper 501 was moved, but also the cutting blade 502 was moved from its original working position ( Figure 4) is raised so that the distance to the packaging material 130 increases. In addition, the stripper 501 in the embodiment shown here was rotated about a rotation axis K, which preferably runs parallel to the rotation axis D but at a distance from it, so that in the rest position of the cutting blade 502 and the securing position of the stripper 501, viewed in the radial direction from the rotation axis D of the cutting blade 502, the stripper extends beyond the cutting blade 502.

[0055] The design of the Figure 5can be realized, for example, by the stripper 501 being rotatably mounted in a suspension, which can be arranged, for example, in the body 550, so that a rotation of the stripper about the rotation axis K takes place when it is moved between the stripping position 401 and the securing position. Such an embodiment can be particularly advantageous if only a small movement amplitude of the stripper 501 in a direction perpendicular to the packaging material plane 130 is desired or possible, for example, to move the cutting blade unit 121 in the transport direction T (see Figure 1) and the packaging material. In the securing position, the stripper extends radially beyond the cutting blade 502 in at least one direction by a distance A (for example, 1 mm or 5 mm or 10 mm or more). This distance A does not have to be constant along the circumference of the cutting blade 502, but can also vary, but is preferably not less than a minimum distance of, for example, 1 mm, preferably at least 5 mm, in order to reliably prevent injuries.

[0056] Figure 6 shows a further embodiment of the movement of the stripper 601 and the cutting blade 602 between the stripping position 401 and the securing position of the stripper 601 or between the working position and the rest position of the cutting blade 602. Instead of a turning movement or rotary movement of the stripper 601 when moving from the stripping position to the securing position (see Figure 5) or vice versa, a linear movement along the double arrow direction is provided for the wiper 601. Analogous to the embodiment of the Figure 5 In this embodiment, the stripper 601 also extends in the securing position in the radial direction from the rotational axis D of the cutting blade 602 beyond the cutting blade 602 (at least by the distance A, which is at least 1 mm, preferably at least 5 mm, particularly preferably at least 10 mm).

[0057] The embodiments of the Figures 5 and 6 can also be combined with each other, so that a combined rotary ( Figure 5 ) and translational or linear ( Figure 6 ) Movement of the scraper from the securing position to the scraping position can be provided.

[0058] While it can be provided that the cutting blade 502 or 602 can also be moved between a working position and a rest position, wherein in the working position it can cut packaging material with the lower blade 111 and in the rest position such cutting of packaging material is not possible, it can also be provided that the cutting blade 602 is not arranged to be movable with respect to the cutting blade unit 121 or with respect to the body 650 (except for a rotation about the rotation axis D). Then it can be provided that only the stripper 601 is arranged to be movable such that it can be moved between the stripping position, in which it can cut packaging material from the strip suction device (see Figure 4 ) and the securing position in which the scraper extends at least in the radial direction from the rotation axis D over the cutting blade 602 by the distance A.

[0059] If both the cutting blade 602 and the stripper 601 are arranged to be movable, it can be provided that the stripper 601 and the cutting blade 602 can be moved in a motion-coupled manner. This can, in particular, include a movement of the cutting blade between the working position and the rest position occurring together with (i.e., at the same time as) a movement of the stripper from the stripping position to the securing position, so that when the cutting blade reaches the rest position, the stripper is also arranged in the securing position.

[0060] A mechanical coupling of the movement of the cutting blade and the stripper can be provided, so that, for example, a drive element and / or actuating element can move the cutting blade and the stripper together. However, the movement amplitudes and / or directions of the cutting blade and the stripper can differ from each other.

[0061] In order to move the cutting blade and / or the stripper, an associated drive element (e.g. an actuator and / or a servo motor) can be provided, which can effect the movement between the securing position and the stripping position or between the working position and the rest position.

[0062] Figure 7shows a further embodiment of a cutting blade unit 121, which can also be combined with the previous embodiments. In this embodiment, the cutting blade unit 121 comprises (e.g., as part of the body 750) a pretensioning element 751, which is connected to the stripper in such a way that it pretensions the stripper 701 into the securing position. Transferring the stripper from the securing position to the stripping position then occurs via a suitable actuation of the stripper (e.g., by actuating the drive element described above for moving between the securing position and the stripping position). Optionally, this pretensioning element 751 or a second pretensioning element (not shown here) can be connected to the cutting blade 702 in such a way that the cutting blade is also pretensioned into the rest position.This ensures that even when the cutting blade arrangement is removed, the cutting blade is surrounded by the stripper 701 in the radial direction as seen from the axis of rotation or that the stripper extends beyond the cutting blade, so that direct intervention in the cutting blade and thus injuries to the operator are avoided.

[0063] The preloading element 751 can, for example, be designed as a mechanical spring or be formed from a pair of magnets arranged with opposite poles or magnets arranged with the same poles, which are arranged relative to each other in such a way that the stripper 701 is preloaded into the securing position and can only be moved into the stripping position by applying force against the magnetic force and / or the spring force. Alternatively or additionally, a securing mechanism, e.g., a blocking element, can be provided that blocks movement of the stripper 701 from the securing position to the stripping position, provided, for example, that the cutting blade assembly is not in the installed state.

[0064] Figure 8 shows another embodiment of a cutting blade unit 121.

[0065] In the embodiment shown here, the cutting blade assembly 102 further comprises an actuating element 851 associated with a cutting blade unit 121, which is physically connected to the stripper 801 (e.g., via the driver 853) such that the actuating element can cause the stripper 801 to move between the stripping position and the securing position. Alternatively or additionally, the actuating element 851 can also be connected to the cutting blade 802 (e.g., via a movement coupling of the cutting blade 802 to the stripper 801) such that the cutting blade can be moved between the working position and the rest position by the actuating element.

[0066] If a pre-tensioning element is installed according to Figure 7 provided, the actuating element 851 can further be designed such that it can cause the wiper to move against the preload force from the securing position to the stripping position.

[0067] In this embodiment, it can be provided that the actuating element 851 is assigned only to the cutting blade unit 121. Alternatively, a common actuating element 851 can be provided, which is connected to all or at least two cutting blade units 121 of the cutting blade arrangement (see, for example, Figure 1 ) and can cause the stripper 801 to move from the securing position to the stripping position via, for example, a driver 853.

[0068] In addition, it can be provided that the cutting blade arrangement comprises a detection element 852 which is fixedly connected to the actuating element 851 or at least is arranged such that a movement of the detection element 852 can be translated into a movement of the actuating element 851. The detection element can be provided to come into contact with a contact element 441 of the device for cutting packaging material (e.g. arranged in the frame 104 of the device) when the cutting blade arrangement is fastened to the device or is in an installed state on the device. If the detection element 852 comes into contact with the contact element 841, it can be provided that the detection element actively or passively signals the installed state of the cutting blade arrangement or at least of the cutting blade unit 121. This signal can, for example,the control unit 180 shown schematically here, wirelessly or via cable, so that the control unit 180 can use this signal to enable the operation of the device, since it is ensured that the cutting blade of the cutting blade unit or the cutting blade unit and / or the cutting blade arrangement as a whole is in the correct position.

[0069] Alternatively, the detection element 852 can be designed passively and, for example, in interaction with the contact element 841, actuate the contact element 841 to transmit a corresponding signal to the control unit 180.

[0070] The contact element 841 can be arranged in a groove or other recess or opening 842 in the frame 104 of the device for cutting packaging material. However, this embodiment is not mandatory. Any other positioning of the contact element 841 in the device for cutting packaging material such that the contact element 841 can interact with a detection element 852 of the cutting blade assembly is also possible.

Claims

1. Cutting knife arrangement (102) for a device (100) for cutting packaging material (130), the cutting knife arrangement (102) comprising at least one cutting knife unit (121) with a cutting knife (221, 222, 324) mounted rotatably about a rotation axis (D) and a movably arranged stripper (223, 325) associated with the cutting knife for stripping packaging material (130) from the cutting knife (221, 222, 324), wherein the stripper (223, 325) can be moved between a stripping position and a securing position, wherein the stripper (223, 325) can strip packaging material (130) from the cutting knife (221, 222, 324) in the stripping position and the stripper (223, 325) extends in the securing position in the radial direction from the axis of rotation beyond the cutting blade (221, 222, 324).

2. Cutting knife arrangement (102) according to claim 1, wherein the cutting knife (221, 222, 324) is arranged to be movable between a working position for cutting packaging material (130) and a rest position, and wherein the stripper (223, 325) in the securing position extends in the radial direction from the axis of rotation (D) beyond the cutting knife (221, 222, 324) in the rest position, and wherein the stripper (223, 325) in the stripping position can strip packaging material from the cutting knife (221, 222, 324) in the working position.

3. Cutting blade arrangement (102) according to claim 1 or 2, wherein the cutting blade (221, 222, 324) and the stripper (223, 325) are designed to be movement-coupled.

4. Cutting blade arrangement (102) according to one of claims 1 to 3, wherein the cutting blade unit (121) comprises exactly one cutting blade (324) and the stripper (325) is arranged at a distance from the cutting blade in a direction parallel to the rotation axis (D); or wherein the cutting blade unit (121) comprises two cutting blades (221, 222) arranged concentrically and spaced from one another along the rotation axis (D), and wherein the stripper (223) is arranged between the two cutting blades.

5. Cutting blade assembly (102) according to one of claims 1 to 4, wherein the cutting blade assembly (102) comprises at least two cutting blade units (121).

6. Cutting knife arrangement (102) according to one of claims 1 to 5, wherein each cutting knife unit (121) is assigned an actuating element (851) of the cutting knife arrangement (102) for effecting a movement of the cutting knife (802) into a working position for cutting packaging material and / or of the stripper (801) into the stripping position; or wherein the cutting knife arrangement (102) comprises a common actuating element (851) for effecting a movement of the cutting knives (802) into the working position and / or of the strippers (801) into the stripping position of at least two cutting knife units (121).

7. Cutting blade assembly (102) according to claim 6, wherein a detection element (852) is connected to the actuating element (851) or the common actuating element (851), wherein the detection element (852) can actively or passively signal the installed state in an installed state of the cutting blade assembly (102) and / or wherein the detection element (852) can cause a movement of the actuating element (851) or the common actuating element.

8. Cutting blade assembly (102) according to one of claims 1 to 7, wherein the cutting blade unit (121) comprises a biasing element (750) for biasing the stripper (701) into the securing position.

9. Cutting blade arrangement (102) according to one of claims 1 to 8, wherein the stripper (501) undergoes a rotational movement about an axis (K) parallel to the rotational axis (D) during the movement between the stripping position and the securing position and / or wherein the stripper (501) undergoes a linear movement in a plane perpendicular to the rotational axis (D) during the movement between the stripping position and the securing position.

10. Cutting blade assembly (102) according to one of claims 1 to 9, wherein the cutting blade assembly (102) comprises a guide (270) and the cutting blade unit (121) is arranged to be movable along the guide in a direction parallel to the axis of rotation (D).

11. Device (100) for cutting packaging material (130) comprising a transport device for transporting packaging material and a cutting device (113) comprising a lower knife arrangement (101) and a cutting knife arrangement (102) according to one of claims 1 to 10 and wherein the cutting knife arrangement (102) and the lower knife arrangement (101) can cooperate to cut packaging material (130).

12. Device (100) according to claim 11, wherein the cutting blade assembly (102) is releasably connected to a frame (104) of the device.

13. Device (100) according to claim 12, wherein a detection element (852) of the cutting blade assembly (102) can come into contact with a contact element (841) of the device in an installed state of the cutting blade assembly (102) and can actuate an actuating element (851) of the cutting blade assembly (102) to effect a movement of the cutting blade (802) into the working position and / or the stripper (801) into the stripping position; or wherein a detection element (852) of the cutting blade arrangement (102) can come into contact with a contact element (841) of the device in an installed state of the cutting blade arrangement (102) and can actuate a common actuating element (851) of the cutting blade arrangement (102) to effect a movement of the cutting blades (802) into the working position and / or the strippers (801) into the stripping position of at least two cutting blade units (121).

14. Device (100) according to one of claims 11 to 13, wherein the device (100) comprises a strip suction device (460) for suctioning a strip of material (431) from a cutting blade unit.

Images