ES2673624T3 - Device and procedure for adjusting the position of a band of packaging material relative to a reference in a packaging machine - Google Patents

Abstract

Device (10) for adjusting the position of a band of packaging material (1, 1 '), particularly of the center (2, 2') of the band of packaging material (1, 1 '), relative to a reference ( 103) in a packing machine, where two devices (21, 26) are provided to adjust the position of the band of packing material (1, 1 '), where the first device (21) is designed to linearly move the band of packing material (1, 1 ') in a direction perpendicular to the transport direction (23) of the band of packing material (1, 1') and the second device (26) is designed to pivot the band of packing material (1, 1 ') around an axis (28) arranged perpendicular to the direction of transport (23) of the band of packaging material (1, 1'), where both devices (21, 26) have in each case a central position and two extreme positions, characterized in that the device comprises a control device, where the device Control device (50), when the first or second device (21, 26) approaches an extreme position, activates in each case another device (26, 21) in such a way that the first device mentioned (21, 26) can move again in the direction of its central position.

Description

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DESCRIPTION

Device and procedure for adjusting the position of a band of packaging material relative to a reference in a packaging machine.

Current state of the art

The invention relates to a device for adjusting the position of a band of packaging material, particularly the band center of the band of packaging material, relative to a reference in a packaging machine according to the general concept of claim 1. Furthermore, the invention relates to a method for adjusting the position of a band of packaging material, preferably by means of a device according to the invention and a packaging machine in the form of a tubular bag machine with a device according to the invention.

A device according to the general concept of claim 1 is known from DE 10 2011 003 666 A1. The device arranged in the feeding zone of a band of packaging material in the area of a tubular bag machine comprises a device, which aligns the band of packaging material with the molding tube of the tubular bag machine, displacing the packaging material band in a direction transverse to the transport direction of the packaging material band. In addition, thanks to DE 44 44 228 C2 a device for adjusting the center of a band of packaging material is known, where the device has several deflection and / or transport rollers, around which the material band is carried packaging. The rollers are arranged on a pivoting frame, which can rotate about an axis arranged perpendicular to the direction of transport of the web of packaging material and, thus, influences the direction of the web of transported packaging material. Finally, thanks to the 10 2007 003 727 B4 it is known, by selective application of a pressure on the surface of a band of packing material in the area of a deflection roller by means of a clamping device, to influence the transport address of the packing material band.

Devices known from the current state of the art have in common that they only have a single device to influence the position of the band of packaging material and / or its center. This results in that, depending on the tolerance position of the band of transported packing material, as well as other circumstances, the band of packing material has to be modified relatively strongly in the area of the (single) device in its direction of transport, to particularly align the center of the packing material band with a reference point of the packaging machine. This means a relatively high mechanical load of the material of the packing material web, which can be critical especially for relatively thin packing materials, so that there is a risk of tearing the packing material web. On the other hand, the provision of only a single device to influence the direction of the packaging material band requires careful alignment and / or distribution of the rest of the parts and / or devices that influence the position of the material band of Packing in the packing machine. SORSEN S L "Basic techniques to control the position of the packing strips", Automation, publication Penton XX, vol. 13, No. 4, April 1, 1965, p. 105-110, XP 000562946 exposes different techniques to change a position of the packing strips. Figure 1d shows how the position of the packing strips can be changed by rotating a roller. The possibility of lateral adjustment of a roller is shown in Figure 4a.

Thanks to EP 309818A2, a device for separating bands of material into two partial bands is known. To achieve a divergence of the separated bands after direct separation, two band adjusting members with correspondingly rotated rollers are arranged. Even before the cut another adjustment body is arranged.

Thanks to DE 19516871 A1, a tubular bag machine and a method for operating the tubular bag machine are known. Here, the path of a band of the packing strips is corrected by means of a device for changing the tension of the packing strips in the area of at least one of both edges of the packing strips. The correction is carried out through a control device due to the measured values of a device to detect the exact course of the packing strips.

Disclosure of the invention

Starting from the current state of the art represented, the invention is based on the object of developing a device for adjusting the position of a band of packaging material, particularly the center of the band of packaging material, with respect to a reference in a machine of packaging according to the general concept of claim 1 in such a way that at a relatively low mechanical load of the material of the band of packaging material a possible influence as large as possible on the position and / or center of the material band of packaging with respect to a reference of a packaging machine. Particularly, critical packaging materials with respect to the influence in the center should also be relatively easy to handle in a packaging machine.

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This object is solved according to the invention in a device with the characteristics of claim 1, providing two devices for adjusting the position, where the first device is designed for linear displacement of the packaging material in a direction perpendicular to the transport direction and the second device is designed to pivot the band of packaging material about an axis perpendicular to the direction of transport of the band of packaging material. The provision of two separate devices to adjust and / or influence in particular the center of the band of packaging material makes it possible to choose relatively small the change of direction required of the band of packaging material in the area of each individual device, giving as result a relatively low mechanical load on the material of the band of packaging material. On the other hand, the disruptive factors that appear during the transport of the band of packing material along its transport path, which cause a deviation from the actual position with respect to a theoretical position, particularly the center of the packaging material band, by means of the second device usually arranged at relatively short distance from the packaging material band processing machine, so that the packaging machine can use the packaging material band completely, for example, To form the packing. According to the invention, it is provided that both devices have in each case a central position and two extreme positions, and that the control device, when the first or second device approaches an extreme position, activates in each case another device in such a way , that the first named device can move again in the direction of its central position. In this way it is particularly avoided that, if one of the devices should already be in the area of its extreme position, it is not possible or only to some extent an additional adjustment in the direction of the extreme position. It is, so to speak, a system of self-alignment.

Favorable improvements of the device according to the invention are specified in the subclaims.

It is especially preferred that the first device is a component of a support device, in which the band of packaging material is stored in the form of a roll of packaging material. The design of the first device is therefore relatively simple in terms of device technology, since the support device already provided for storing the band of packaging material only has to be designed to move in a direction transverse to the transport direction of the packing material band, to configure the first device. On the other hand, such configuration of the first device allows relatively large tolerances, as regards the positioning of the roll of packaging material on the support device, since the theoretical position of the band of packaging material on the support device can adjust using the first device within a wide range.

Furthermore, it is preferably provided that the second device comprises a pivotable rotating frame around an axis, and that a first distance between the two devices is greater than a second distance between the second device and a molding device of the packaging machine, in whose zone the reference is arranged. In particular, due to the second relatively small distance between the second device and the molding device a small deviation from the center of the web is achieved with respect to the reference at the critical point of the packaging machine, since between the second device and The reference only provides a brief transport route for the packing material band. In addition, it becomes possible through a relatively large distance between the two devices, which, even with a relatively small variation of the transport direction of the band of packaging material in the area of the first device, due to the relatively large distance to the second device, the center varies relatively strongly to the area of the second device, so that the direction or position of the center in the first device only has to be altered relatively little.

An especially preferred arrangement of the invention provides that between both devices a device is provided for measuring the band voltages acting in the transverse direction of the packaging material band, and that a control device activates the two devices as a function of the band voltages detected from the band of packaging material. Such a configuration makes it possible in particular to activate both devices in such a way that an as uniform evolution as possible of the band tension is obtained transversely to the transport direction of the band of packaging material and / or, seen as a whole, an especially small load of the band of packing material.

To control the actual position of the band of packaging material, it is envisioned that a sensor system is arranged between the second device and the molding device of the packaging machine to detect the position of the band of packaging material. The control device of the packaging machine then activates the two devices depending on the detected position of the band of packaging material.

The invention also comprises a packaging machine in the form of a tubular bag machine with a device according to the invention to adjust the position, in particular the center of the band of packaging material, with respect to a reference.

Furthermore, the invention includes a method for adjusting the position, in particular the center of a band of packaging material, with respect to a reference in a packaging machine, preferably using a device according to the invention, in which two separate independent devices in the transport direction of the

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Band of packaging material are intended to influence the position of the band of packaging material, as well as a control device to control both devices, which activates the two devices to achieve a theoretical position based on a real position detected from the packing material band.

In order to achieve the lowest possible mechanical load of the band of packaging material and / or relatively low stresses in the band of packaging material, it is envisaged that the control of both devices in the band of packaging material will take place depending on a tension of band detected between the two devices.

Other advantages, features and details of the invention will be apparent from the following description of the preferred embodiments, as well as based on the drawing.

This shows in:

Fig. 1 a simplified plan view of a packaging machine in the form of a tubular bag machine with a device according to the invention to adjust the center of a band of packaging material relative to a reference point of the bag machine tubular in a first mode of operation;

Fig. 2 the packing machine of Fig. 1 during a second mode of operation and

Figs. 3a and 3b flow charts to explain the different modes of operation.

The same elements and / or elements with the same function are provided in the Figures of the same reference numbers.

In Figs. 1 and 2 a packaging machine is shown in the form of a tubular bag machine 100. Particularly a molding and filling tube 101 is recognized, which is enclosed by a molding shoulder 102. The molding shoulder 102 serves to mold a tube of packaging material from a band of packaging material 1. The band of packaging material 1 is particularly a strip of heat-sealable packaging material 1, made of plastic material, but material bands are also conceivable, for example Packing 1 of paper coated with a layer of glue. It is essential that, for the correct molding of the packaging material tube, from which filled bags are manufactured, the center 2 of the packaging material band 1 must be aligned with respect to the molding shoulder 102. In the example of In this embodiment, it is assumed that the center 2 of the band of packaging material 1 has to be aligned centrally with respect to the molding shoulder

102 and / or the molding and filling tube 101, which is represented by reference line 103.

The band of packaging material 1 is stored in the form of a roll of packaging material and rotatably mounted on a support device 15 in a horizontal direction. Thus, by removing the band of packaging material 1, for example, by means of the transport rollers 16 to 18 shown in Fig. 1, it is possible and / or facilitates a transport of the band of packaging material 1 in the direction towards the molding shoulder 102.

According to the invention, it is envisaged that the tubular bag machine 100 is equipped with a device 10, which makes it possible to position and / or align the center 2 of the band of packing material 1 with respect to the reference line 103. For this, the device 10 comprises a first device 21, made by the support device 15. The first device 21 has in particular a displacement drive not shown, which makes it possible to move the support device 15, and therefore also the band of stored packing material 1 on the support device 15, in the direction of the double arrow 22 in a direction perpendicular to the transport direction 23 of the band of packaging material 1. On the other hand, the first device 21 comprises at least a first sensor 24, which detects, for example, an edge 3, 3 'of the band of packaging material 1, from which a control device 50, knowing the width of the band of packaging material 1, in the exact position of the band of packaging material 1 and / or the center of band 2, 2 ’includes the area of the support device 15.

In addition, the device 10 comprises, at a distance A1 from the first device 21, a second device 26, which has a rotating frame 27 with conveyor or deflection rollers, which serves to transport the web of packaging material 1. It is essential that the rotating frame 27 is pivotally mounted in the direction of the double arrow 29 around an axis 28, which runs perpendicularly to the plane of the drawing of Fig. 1. Also the second device 26 is coupled to the control device 50 for, on the one hand, supply the control device 50 with the position of the second device 26 and / or its angular position as an input value, and, on the other hand, be activated by the control device 50, to position the rotary frame 27 in axis 28 in a theoretical position.

By means of both devices 21, 26, which are activated by the control device 50 or connected to it, the center 2 of the band of packing material 1 can be affected with respect to the reference line

103 of the molding shoulder 102. The second device 26 is located at a distance A2 from the molding shoulder 102

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which, in contrast to the representation of Figures 1 and 2, is substantially less than the distance Ai between the two devices 21,26.

In addition, a sensor system 30 with edge sensors 31, 32 is provided between the second device 26 and the molding shoulder 102, whose signals are also supplied to the control device 50 as input values. Between the sensor system 30 and the molding shoulder 102 an exemplary deflection roller 33, which feeds the packing material band 1 to the molding shoulder 102, is shown exemplary.

In addition, it is noted that the area between the first device 21 and the molding shoulder 102, in addition to the transport rollers 16 to 18 and the deflection roller 33, can still have a large number of additional deviation and / or transport rollers , which are not represented solely for simplicity. On the other hand, it is pointed out that the transport of the packing material band 1 from the support device 15 to the molding shoulder 102 can be carried out either continuously or pulsed, or in a mixed form, in which in a Partial area between the support device 15 and the molding shoulder 102 is a buffer zone with the so-called crazy rollers, which allows compensation between a pulsed and a continuous transport of the band of packaging material 1.

In addition, it is optionally provided that in the area between the two devices 21 and 26, a device 35 is provided to detect the material properties of the band of packaging material 1. Particularly, by means of the device 35, which is also connected to the control device 50, a tension profile of the band voltages of the packaging material band 1 can be determined transversely to the transport direction 23 of the packaging material band 1.

The device 10 described so far to adjust the center 2 of the band of packaging material 1 with respect to the reference line 103 of the tubular bag machine 100 can operate in different modes of operation. With a view to Figs. 1 and 3a, a first mode of operation is explained, in which the final state to be reached of the position of the band of packaging material 1 is represented by the continuous lines of the edges of the band 3 and 4, in which center 2 is oriented to reference line 103a. By means of the discontinuous representation of the band of packaging material 1 'an initial state with edges of band 3', 4 'is represented, in which between the center 2 in the final state and the center 2' in the initial state there is a lateral deviation a. To arrive from the initial state to the final state, the position of the band of packing material 1 on the support device 15 is then determined by means of at least a first sensor 24 and then (known the width of the band of packing material 1), the support device 15 adjustable and / or the first device 21 is activated by the control device 50 in such a way that the band of packing material 1 in the exemplary embodiment represented in the plane of the drawing of Fig. 1 moves from right to left, until the actual position of the band of packing material 1 coincides with the theoretical position, in which the center 2 is aligned with the reference line 103. The alignment of the Center 2, 2 'with the reference line 103 is also carried out depending on the speed of the band of packaging material 1 and other specific properties of the packaging.

Particularly for materials of the band of packaging material 1 relatively qualitatively bad with respect to transport, however, large so-called arc errors may appear, which ensures that, although the center 2, 2 'of the band of packaging material 1 matches in the area of the support device 15 with the theoretical position (this means that the roll of packaging material present on the support device 15 is centrally arranged with respect to the reference line 103), the center 2, 2 'may have on the shoulder of molding 102, however, a deviation a. This deviation a, which is detected by means of the sensor system 30, can be quickly compensated by the second device 26, which is relatively short of the molding shoulder 102, rotating the second device 26 in one of the two directions of the double arrow 29.

In Fig. 3a the modification of the center 2 ’with respect to the referenced center 2 (curve Y) is represented by the evolution of the X curve over time t. In addition, the evolution of the control signal for the first device 21 is recognized by the Z curve. Particularly it is recognized that for the positioning described so far from the center 2 with respect to the reference line 103, in principle, it is only necessary the first device 21. Also the compensation of the mentioned arc error of the band of packaging material 1 can be performed basically only with the first device 21, although it is favored and / or accelerated with the second device 26.

A second mode of operation is shown in Fig. 2, which may appear during production in an already established state of the packing material band 1 in the already aligned state of the band center 2 with respect to the reference line 103. Since the second device 26 is arranged at a relatively short distance A2 from the molding shoulder 102 and / or the reference line 103 on the molding shoulder 102, it can occur, inter alia, that the second device 26 is already so strongly rotated around axis 28, which is close to the edge of its working area, which should be represented by the discontinuous representation of the rotating frame 27. In this case, another correction of center 2 is no longer possible for a deviation a in said direction detected by the sensor device 30. Therefore, it is desirable, in order to avoid production pauses, that the second device 26 is pivoted (back) of the discontinuous representation back to a position average n, from which deviations can be compensated center 2 with respect to the reference line 103 in both directions by

the second device 26. This is carried out by causing the first device 21 to move the support device 15 from the position shown by the discontinuous representation to the right, so that the second device 26 can pivot back relative to its angle with respect to to axis 28 in the direction of its middle position. The mode of operation of this second mode of operation is clarified by Fig. 3b. It represents that the real and theoretical position of center 2 (curve X) are aligned with the reference line 103 throughout the time. The control signal for the first device 21 is clarified by the Y curve, which, after a certain time, allows a return of the second device 26 to its central position, which is illustrated by the Z curve (control signal of the second device 26).

The device 10 described so far can be varied or modified in various ways, without departing from the 10 objects of the independent claims. Particularly it is also conceivable to activate both devices 21, 26 depending on the band tension profile detected by the device 35 such that transversely to the longitudinal direction of the band of packing material 1 therein certain tensions are not exceeded, to load the material of the packing material band 1 as little as possible. In addition, the application of the device 10 should not be limited to tubular bag machines 100, but can also be used in other packaging machines. It can also be provided that, when the first device 21 approaches one of its extreme lateral positions, analogously to the manner explained in relation to Figs. 2 and 3b, the second device 26 is activated so that the first device 21 can move from new in the direction of its central position.

Claims (7)

1. Device (10) for adjusting the position of a band of packing material (1, 1 '), particularly of the center (2, 2') of the band of packing material (1, 1 '), relative to a reference (103) on a packing machine, where 5 two devices (21, 26) are provided to adjust the position of the band of packaging material (1, 1 '), where the first device (21) is designed to linearly move the band of packaging material (1, 1 ') in a direction perpendicular to the transport direction (23) of the band of packaging material (1, 1') and the second device (26) is designed to pivot the band of packaging material (1, 1 ') around an axis (28) arranged perpendicularly to the direction of transport (23) of the band of packaging material (1, 1 '), where both 10 devices (21,26) have in each case a central position and two extreme positions, characterized in that the device comprises a control device, where the control device (50), when the first or second device (21, 26) approaches an extreme position, activates in each case another device (26, 21 ) in such a way that the first mentioned device (21,26) can move again in the direction of its central position. 2. Device according to claim 1, 15 characterized in that The first device (21) is a component of a support device (15), in which the band of packaging material (1) is housed in the form of a roll of packaging material. 3. Device according to claim 1 or 2, characterized because 20 the second device (26) comprises a rotating frame (27) pivotable about the axis (28), and because a first distance (A1) between both devices (21, 26) is greater than a second distance (A2) between the second device (26) and a molding device (102) of the packaging machine, in whose area the reference (103) is arranged. 4. Device according to one of claims 1 to 3, 25 characterized in that between both devices (21, 26) a device (35) is provided for measuring the band voltages acting in the transverse direction of the band of packaging material (1, 1 '), and because the control device (50) activates both devices (21,26) based on the detected band voltages of the packing material band (1, 1 '). 5. Device according to claim 3 or 4, 30 characterized because Between the second device (26) and the molding device (102) a sensor system (30) is arranged to detect the position of the band of packaging material (1, 1 ’). 6. Packaging machine in the form of a tubular bag machine (100) with a device (10) according to one of claims 1 to 5. 35 7. Procedure for adjusting the position, particularly the center (2, 2 ’) of a band of packaging material (1, 1 '), with respect to a reference (103) in a packaging machine, preferably by means of a device (10) according to one of claims 1 to 5, wherein two different, spaced apart devices (21, 26) are provided. in the transport direction (23) of the band of packaging material (1, 1 '), to influence the position of the band of packaging material (1, 1'), as well as a control device (50) to control both devices (21, 26), which activates both devices (21, 26) to reach a theoretical position based on a real detected position of the band of packing material (1, 1 '), where both devices ( 21, 26) have in each case a central position and two extreme positions, characterized in that the control device (50), when the first or second device (21, 26) approaches an extreme position, activates in each case another device (26, 21) in such a way that the first device (21,26) cited may later lacing again in the direction of its central position. 8. Method according to claim 7, characterized in that The control of both devices (21,26) is carried out based on a band voltage detected between both devices (21,26) in the band of packaging material (1, 1 ’).