EP2653398A1 - Directly driven rotary knives for tubular film - Google Patents

Abstract

The apparatus has a knife actuating ring (3) and a knife carrier (2). The blades are folded inwardly, when the knife actuating ring is rotated relative to the blade carrier. The knife actuating ring and/or the knife carrier are driven directly. Independent claims are included for the following: (1) device for applying labeling case; and (2) method for cutting labeling sleeve of film tube.

Description

The invention relates to a device for cutting Etikettierhülsen of a film tube, a device for applying a Etikettierhülse and a method for applying a Etikettierhülse.

For example, in the field of beverage filling shrink labels are used, which are cut from an endless tube to the correct length and then passed over the bottle. Subsequently, the bottle can be passed through a shrink tunnel, in which the labeling sleeve is then shrunk. Other labeling sleeves, such as flexible Etikettierhülsen, may be present on film tubes and used in the field of beverage bottling.

In the prior art devices are disclosed for cutting of labeling sleeves, which control the blades by means of electromagnets as in EP 1 454 832 B1 described the rotary knives as in the EP 0 330 167 B1 use or control the knives with a flyweight as in the DE 2010 49 72 U1 ,

Such devices, when operated with timing belts, have the disadvantage that belt operation is loud and the belts are subject to high wear and tear. Therefore, such machines are loud, maintenance-intensive and susceptible to failure.

The object of the invention is to provide an improved device for cutting Etikettierhülsen.

This object is achieved by a device for cutting Etikettierhülsen according to claim 1.

A device according to the invention comprises a knife actuating ring and a knife carrier, wherein the knives are rotatably mounted on the knife carrier and are mechanically coupled via the knife actuating ring. Knife carrier and knife actuating ring are usually arranged coaxially. If the knife carrier and knife actuating ring are displaced in the direction of rotation in relation to each other in one direction, then the knives fold inwards due to the mechanical coupling via the knife actuating ring into the cutting position. Knife carrier and knife operating ring can both be referred to as a cutting wheel below. In order to fold back the knives, knife carrier and knife actuating ring are returned to their original relative position. By "inward", in particular, in a substantially radial direction towards the center of the substantially understood annular contact carrier, ie in the direction of the label material to be cut.

The knife actuating ring and / or the knife carrier are rotatably mounted according to the invention. During operation, the knife carrier and knife actuating ring run synchronously for this process. For the cutting process, a speed difference between the running speeds is generated in each case for a short time so that the knife carrier and knife actuating ring move in the direction of rotation. For example, the knife actuating ring or the knife carrier can be braked compared to the other cutting wheel. As a result, the blades fold into the cutting position. During cutting, the cutting ring and knife carrier run synchronously, so that the position of the knife does not change. In order to fold the knives back out of the cutting position, this relative displacement must be canceled again after the cut. This is usually done by again briefly generating the reverse speed difference between the running speeds until the relative displacement has been canceled. For this purpose, for example, the previously braked blade actuating ring or knife carrier can be accelerated in the direction of rotation for a short time compared to the other cutting wheel.

Speed in the direction of rotation is used in the text to increase the speed in the direction of rotation. In other embodiments, the device may also be designed so that a cutting wheel, ie knife carrier or knife actuating ring is accelerated in the direction of rotation first to unfold the cutting blade and thereby the relative position between the two cutting wheels is changed. For example, following a cut, the cutting blades can be brought back into the original relative position by braking the respective cutting wheel. In further embodiments, a cutting wheel is accelerated in the direction of rotation and the second cutting wheel braked at the same time to move the cutting wheels against each other. In order to restore the original relative position, then, for example, after cutting the previously accelerated in the direction of rotation cutting wheel braked again and the second, previously braked cutting wheel can be accelerated simultaneously in the direction of rotation.

Knife actuating ring and / or knife carrier are driven directly in a device according to the invention. In this case, directly driven can mean that the knife carrier and / or the knife actuating ring, which is directly driven, is driven by a motor without a toothed belt transfer. This may for example be the case when the knife carrier is connected and / or the knife actuating ring is directly and / or fixedly connected to a drivable component, wherein the movable components move the knife carrier and / or knife actuator ring. In particular, in the case of a direct drive can be dispensed with a toothed belt.

For example, such a device may be designed so that a cutting wheel is driven with a toothed belt and the second cutting wheel, which brakes for folding and folding the knife and accelerated in the direction of rotation, or is accelerated and decelerated in the direction of rotation, is directly driven.

In such a device but also knife actuating ring and knife carrier can be driven directly. This can be advantageous, for example, since the space required for the device can thereby be reduced, since, for example, the motor can be integrated into an aggregate base plate. Also, for example, the blade unit can be pre-assembled and tested.

In a device according to the invention, the direct drive for a cutting wheel by an electric motor, in particular, for example, a torque motor done. In particular, an electric motor can be present for each directly driven cutting wheel, which can drive the respective directly drivable cutting wheel.

In some embodiments, one or two rotors of one or two electric motors may drive the rotating parts. Here, usually each rotor is part of exactly one electric motor and usually each electric motor comprises exactly one rotor. In particular, each directly driven cutting wheel can be connected to a rotor of an electric motor or comprise a rotor of an electric motor or be part of the rotor, wherein this connection is preferably not detachable. In particular, knife actuating ring and / or knife carrier can each be connected to a rotor of an electric motor, wherein the connection is preferably not solvable. Non-releasable in this context means a solid connection, which is not held by releasable means such as screws, but by solid compounds, such as glue, nails or welds. However, the connection between a directly driven cutting wheel and an associated rotor of an electric motor can also be made detachable.

In a previously described device, the rotors of the electric motors may be coaxial with each other and / or coaxial with the knife actuating ring and the knife carrier and / or its axis (s) parallel to the axis of rotation of the cutting knife or blades. This can be advantageous since, for example, when the two cutting wheels are displaced relative to one another, the knives coupled to the knife actuating ring pass through the shift can be moved quite easily. In addition, a space-saving arrangement of the device parts can be achieved thereby.

In some embodiments, an apparatus for cutting labeling sleeves (also referred to as a device in the text) may be configured such that the one or more electric motors associated with the one or more rotors of the one or more electric motors are fixed to the stationary part of the apparatus. (A fixed part of the device is hereby designated the part which is not moved during operation of the device.) A movement of the whole device is not taken into account.) Such stators of the electric motor or motors can also be coaxial with one another and / or with one or both rotors be arranged of the electric motors or the device.

In some devices, the knife carrier and / or the knife actuating ring may be individually controllable. In this case, the control can take place, for example, by a central control unit, which can take into account, for example, the control and / or position of the respective other cutting wheel. In the control, for example, the optional position detection of knife actuating ring and / or knife carrier can be incorporated.

In some embodiments, the knife carrier and / or knife actuating ring may be mounted on the stationary part of the device via one, two or more ball bearings. For example, the knife carrier can be mounted on the stationary part via a first ball bearing and the knife actuating ring can be mounted on the knife carrier via a second ball bearing. In some embodiments, the blade actuating ring may be mounted on the stationary part via a first ball bearing and the blade actuating ring may be mounted on the blade carrier via a second ball bearing. In some embodiments, both the knife actuating ring and the knife carrier may be mounted on the stationary part of the device via a respective ball bearing.

In some embodiments of the device, the device may include a sensor that can detect the position of the blade carrier. For example, the position relative to the stationary part of the device can be detected. Such a sensor may include, for example, a scanning head, for example, a hollow shaft encoder.

In some embodiments of the device, the device may detect a sensor that can detect the position of the blade actuating ring. For example, the position relative to the stationary part of the device can be detected. Such a sensor may include, for example, a scanning head, for example, a hollow shaft encoder.

A sensor that can detect the position of the blade carrier and / or a sensor that can detect the position of the blade actuating ring can detect the position, for example, by means attached to the stationary part of the device or by the stationary part of the device. For example, a position detection can be carried out on the basis of a hollow shaft encoder, so an aid may be formed, for example, as a donor wheel of a hollow shaft encoder.

For example, in some embodiments, the position detection may be based on one or two optical sensors that may detect, for example, measurement scales attached to the stationary part of the device.

In some embodiments, the sensor for detecting the position of the blade actuating ring and / or the sensor for detecting the position of the blade carrier may be attached to or included in the stationary part of the device. At the same time, aids for detecting the position on the knife actuating ring and / or the knife carrier can also be attached to or covered by this or these.

The fixed part of the device may for example comprise a hollow shaft, in particular it may be formed as a hollow shaft.

In some embodiments, the device may include four individual cutting blades on the knife carrier. Such blades are referred to in this text as a knife. The device may alternatively comprise only one or two or three cutting blades on the knife carrier. In an arrangement of more than one knife, in particular, for example, four knives, however, a significantly faster cut can be achieved because each knife only has to cut a portion of the circumference of the film tube. Usually, the knives are arranged at equidistant intervals on the knife carrier. With such a device, for example, a cut can be carried out within less than 100 ms, in particular less than 60 ms, in particular less than 40 ms. On the cutting speed, the direct drive can also have a positive effect, since in some cases, the cutting speed can be increased.

The invention also includes a device for applying a labeling sleeve, which comprises a previously described device for cutting labeling sleeves of a film tube (which is also referred to as a device).

Furthermore, the invention also includes a method for applying a Etikettierhülse with a device for cutting Etikettierhülsen of a film tube (which also called device). The method comprises synchronously driving knife carrier and knife actuating ring. The knife carrier and / or the knife actuating ring is driven directly. Furthermore, the method comprises the short-term generation of a speed difference between the running speeds, so that the knife carrier and knife actuating ring (in the direction of rotation) move against each other. For example, the knife actuating ring or the knife carrier can be braked compared to the other cutting wheel. As a result, the blades fold into the cutting position. During the cut, the two cutting wheels can then run synchronously again. In order to fold the knives out of the cutting position, this relative displacement must be canceled again. This is usually done by again briefly generating a speed difference between the running speeds until the relative displacement is canceled, ie the two cutting wheels are in particular again in the original relative position and can continue to be driven synchronously. In particular, the previously generated speed difference for the same duration with the opposite sign can be applied to the cutting wheel whose speed has previously been changed. For this purpose, for example, the previously braked blade actuating ring or knife carrier can be accelerated in the direction of rotation for a short time compared to the other cutting wheel.

In some embodiments, a speed difference and thereby induced displacement of the cutting wheels to each other can also be generated by the fact that at the same time a cutting wheel braked and the other is accelerated in the direction of rotation. For returning to the original relative position then the operations can be reversed, so for example, the previously braked cutting wheel accelerated in the direction of rotation and the previously accelerated in the direction of rotation cutting wheel are decelerated.

Figur 1a

Ein Beispiel für eine Vorrichtung zum Abschneiden von Etikettierhülsen von einem Folienschlauch in Richtung der Achse des Messerträgers und Messerbetätigungsrings;

Figur 1b

Eine Detail einer beispielhaften Vorrichtung zum Abschneiden von Etikettierhülsen von einem Folienschlauch.

Figur 2

Einen Ausschnitt aus einer beispielhaften Vorrichtung zum Abschneiden von Etikettierhülsen im Querschnitt durch die Achse des Messerträgers und Messerbetätigungsrings.

Further embodiments of the invention will be described with reference to the figures. It shows

FIG. 1a

An example of an apparatus for cutting labeling sleeves from a film tube in the direction of the axis of the knife carrier and knife actuating ring;

FIG. 1b

A detail of an exemplary apparatus for cutting labeling sleeves from a film tube.

FIG. 2

A section of an exemplary device for cutting Etikettierhülsen in cross section through the axis of the knife carrier and knife actuating ring.

In FIG. 1a a device is shown for cutting labeling sleeves from a film tube in the direction of the axis of the knife carrier and knife actuating ring. Visible is in FIG. 1a the knife actuating ring 3, the knife carrier 2 and the cutting blade 14, which are rotatably mounted about an axis 15. The cutting blades 14 are mechanically, here by way of example, coupled via a pin 16a to the blade actuating ring 3. The optionally present pivotable limiting region 16b can restrict the possibility of movement of the pin 16, for example. In the FIG. 1a The arrangement shown can be operated so that knife operating ring and blade carrier are operated with timing belt. If at least the knife actuating ring or knife carrier is driven directly, the in FIG. 1 a shown arrangement in a device according to the invention for cutting Etikettierhülsen of a film tube may be included.

In FIG. 1b a detail of a device for cutting labeling sleeves is visible in which a cutting blade 14 is more clearly visible. The view is from the in FIG. 1a rearward side so that details are visible in FIG. 1a are not visible. Depending on the drive type of the knife carrier and knife actuating ring, such an arrangement may be included in some embodiments of a device according to the invention. Also visible is the axis 15 about which the cutting blade 14 is rotatably mounted. The cutting blade 14 is rotatably mounted as shown on the blade carrier 1, and mechanically coupled to the blade actuating ring 3. This coupling to the knife actuating ring can take place, for example, via a pin (not shown here) whose movement possibility can be restricted, for example, through the opening 17 in the optionally present pivotable limiting region 16b. The pivotable boundary region 16b can be pivoted about the axis 18, for example.

In FIG. 2 An example of an embodiment of the invention is shown in cross-section through the axis of the knife actuating ring and the knife carrier. Since a device according to the invention can be rotationally symmetric, is in FIG. 2 only one half of the cross-section of the device shown. Visible here are the fixed part 1 of the device, the knife carrier 2 and the knife actuating ring 3. The knife carrier 2 is in this example connected to the rotor 6, which may be part of an electric motor, in particular a torque motor, which further comprises stator 7.

The knife actuating ring 3 is in this example connected to the rotor 8, which may be part of an electric motor, in particular a torque motor, which further comprises stator 9. The two rotors 6, 8 and / or the two stators 7, 9 can be arranged coaxially with each other be like in FIG. 2 visible, noticeable. The rotors 6, 8 and / or the stators 7, 9 can in particular also be arranged coaxially with the knife carrier 2 and knife actuating ring 3.

The fixed part 1 of the device may comprise a hollow shaft. The knife carrier may be mounted on the fixed part 1 via ball bearings 4. Also by a ball bearing 5 can as in the in FIG. 2 be shown example Messerbetätigungsring 3 and knife carrier 2 be stored. Knife actuating ring and knife carrier are arranged rotatably and can be driven directly by the electric motors, in particular can be driven by driving the rotor 6 of the knife carrier 2 and by driving the rotor 8 of the knife actuating ring 3.

Alternatively, knife actuating ring and knife carrier can also be arranged differently than in FIG. 2 shown. For example, a knife carrier may be arranged as an inner cutter wheel and a knife actuating ring as an outer cutter wheel, in contrast to the one in FIG FIG. 2 shown example, in which the knife carrier is designed as an outer, and the knife actuating ring as an inner cutting wheel.

Also visible in FIG. 2 an optionally available scanning 12 of a hollow shaft encoder for the blade carrier and the optional encoder wheel 13 of a hollow shaft encoder for the blade carrier. Accordingly, the optional scanning head 10 of a hollow shaft encoder for the blade actuating ring and the optional encoder wheel 11 of a hollow shaft encoder for the blade actuating ring are visible. The connection between the knife carrier 2 and scanning 12 is carried out in the example shown here detachably, for example by a screw, the connection between the knife actuating ring and the scanning 10 is carried out in the example shown here also releasably, for example by a screw.

If the device shown is operated, the two cutting wheels, namely knife actuating ring 3 and knife carrier 2 rotate synchronously. In order to unfold the cutting blades in the cutting position, one of the two cutting wheels is accelerated for a short time with respect to the other cutting wheel, for example braked or its rotational speed increased, whereby the two cutting wheels are shifted from each other. As a result, the cutting blades fold in the cutting position. In this position, a cut can be carried out while the two cutting wheels run synchronously again. In order to fold back the cutting wheels, the previously accelerated cutting wheel is again accelerated for a short time, for example, its rotational speed is increased or decelerated so that the two cutting wheels can reach the original relative position and can continue to be operated synchronously. To the better understanding is a cutting blade 14, for example, a cutting blade FIG. 1a Accordingly, dash-dotted in cross-section shown.

In the FIG. 2 The device shown can be part of a device for applying a labeling sleeve (not shown here).

Claims (15)

Device for cutting labeling sleeves from a film tube, comprising a knife actuating ring (3) and a knife carrier (2), in which the knives are folded inwards when the knife actuating ring (3) is displaced relative to the knife carrier (2), characterized in that the knife actuating ring (3) and / or the knife carrier (2) are driven directly. Apparatus for cutting Etikettierhülsen of a film tube according to claim 1, characterized in that the knife actuating ring (3) and knife carrier (2) are driven directly. Apparatus for cutting Etikettierhülsen of a film tube according to any one of claims 1-2, characterized in that the direct drive is effected by one or two electric motors. Device for cutting labeling sleeves of a film tube according to one of claims 1-3, characterized in that one or two rotors (6, 8) of the one or two electric motors drive the rotating parts. Apparatus for cutting labeling sleeves of a film tube according to any one of claims 1-4, characterized in that the rotors (6, 8) of the electric motors coaxial with each other and / or coaxial with the blade actuating ring and the knife carrier and / or their axis (s) in parallel to the rotation axes (15) of knives (14) are formed. Device for cutting labeling sleeves from a film tube according to one of claims 1-5, characterized in that one or two stators (7, 9) are fastened to the stationary part of the device. Apparatus for cutting Etikettierhülsen of a film tube according to any one of claims 1-6, characterized in that the knife carrier (2) and / or knife actuating ring (3) are individually controllable. Device for cutting labeling sleeves of a film tube according to one of claims 1-7, characterized in that the knife carrier (2) and / or the knife actuating ring (3) via one or two or more ball bearings (4, 5) on the fixed part ( 1) of the device are stored. Apparatus for cutting Etikettierhülsen of a film tube according to any one of claims 1-8, characterized in that the position of the knife carrier (2) by a sensor (12) is detected. Apparatus for cutting Etikettierhülsen of a film tube according to any one of claims 1-9, characterized in that the position of the blade actuating ring (3) by a sensor (10) is detected. Device for cutting labeling sleeves of a film tube according to any one of claims 1-10, characterized in that the sensor (12), which detects the position of the knife carrier (2), and / or the sensor (10), the position of the knife actuating ring (3) detects the position detected on attached to the fixed part of the device aids. Apparatus for cutting Etikettierhülsen of a film tube according to any one of claims 1-11, characterized in that the fixed part of the device comprises a hollow shaft. Device for cutting labeling sleeves of a film tube according to one of claims 1-12, characterized in that it comprises four individual knives (14) on the knife carrier (2). Apparatus for applying a labeling sleeve, characterized in that it comprises a device for cutting of labeling sleeves of a film tube according to any one of claims 1-13. A method for applying a labeling sleeve with a device for cutting labeling sleeves of a film tube of a labeling sleeve according to any one of claims 1-14, further comprising: Synchronous driving of knife carrier and knife actuating ring, wherein the knife carrier and / or the knife actuating ring are driven directly, momentary generation of a speed difference between the running speeds, so that the knife carrier and knife actuating ring (in the direction of rotation) move against each other, momentary generation of a speed difference between the running speeds of the knife carrier and the knife actuating ring, so that the knife carrier and knife actuating ring return to the original relative position.

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