EP2209718B1 - Labeling assembly comprising an electrically heating gluing roller - Google Patents

Abstract

On an electrically heatable gluing roller (10) for use with labeling machines, comprising a roller element (11) that can be driven to rotate about a gluing roller axis (LA), said roller element forming at least one circumferential or gluing surface, which surrounds the gluing roller axis and is configured rotation-symmetrically to said axis, for the application of glue to be transferred at least partially to labels, and comprising a heating device (19) having at least one induction coil (19.1, 19.2, 19.3) for heating the roller element (11) at least on the glue surface (12.1) by currents induced in the roller element, the at least one heating device is completely accommodated in a space (20) that is located inside the gluing surface, or the imaginary extension thereof in the direction of the gluing roller axis.

Description

The invention relates to a labeling unit according to the preamble of claim 1 and in particular to a labeling unit with electrically heatable glue roller.

Labeling units for use in labeling machines are known in different designs. Also known is the use of glue rollers for a direct or indirect application of the required glue film on the labels, wherein it is often required depending on the type of glue used, not only the glue supply to the respective glue roller, but also the glue roller itself heat.

A glue application device for labeling machines ( DE 298 22 906 U1 , According to the preamble of claim 1) with a glue roller whose circumferentially driven roller element is inductively heated by an electric heater on its peripheral or glue surface. The heater is stationary, ie not arranged circumferentially with the roller element. The heating of the roller element is carried out inductively. The disadvantage here is, inter alia, that the heating device and temperature sensors for controlling the heating power in each case outside the glue roller or the circumferentially driven roller element and in the immediate vicinity of the outer or adhesive surface of the roller element are, ie in an area in which these components of a strong Pollution in particular by glue as well as the risk of mechanical damage are exposed by external force. In the known glue application device, the heating device further extends over the entire axial height of the rotating roller element of the glue roller, so that an individual temperature control or - individual control, in the direction of the axis of the roller element adjacent or successive areas is not possible. Disadvantage is further in the known glue application device, that by the stationary arranged at the periphery of the roller element heater only temporarily each located directly on this heater portion of the roller element is heated, so for a heating of the roller element on the entire circumferential or gluing surface in each case a full revolution of the roller element is required, which in particular when starting a labeling a relatively long preheating time is required at circumferentially driven roller element.

Inductively heatable rollers ( JP 2002-170659 A . US 3 790 736 A . DE 37 41 232 C2 . DE 202 17 966 U1 . EP 1 168 889 A2 . US 2006/0276317 A1 ), in which at least one induction coil is arranged within the roller body as heating element. However, these known rolls are not glue rolls, but rolls for heating strand or fiber material guided over the respective roll, heatable rolls of a printing device, heatable calender rolls or heatable rolls for producing webs of fiber material.

The object of the invention is to show a labeling, which avoids the aforementioned disadvantages and allows for a protected against contamination and mechanical damage housing the heating of the glue roller short heating of this roller. To solve this problem, a labeling according to the patent claim 1 is formed.

Further developments, advantages and applications of the invention will become apparent from the following description of exemplary embodiments and from the figures. In this case, all described and / or illustrated features alone or in any combination are fundamentally the subject of the invention, regardless of their summary in the claims or their dependency. Also, the content of the claims is made an integral part of the description.

Fig. 1

in vereinfachter Darstellung und in Draufsicht das Etikettieraggregat einer Etikettiermaschine, zusammen mit einer beheizbaren Leimwalze gemäß der Erfindung;

Fig. 2

in schematischer Darstellung und im Schnitt die beheizbare Leimwalze des Etikettieraggregates der Figur 1.

The invention will be explained in more detail below with reference to the figures of an embodiment. Show it:

Fig. 1

in a simplified representation and in plan view of the labeling of a labeling machine, together with a heatable glue roller according to the invention;

Fig. 2

in a schematic representation and in section the heatable glue roller of the labeling of the FIG. 1 ,

In the figures, 1 is a labeling machine for labeling bottles 2, which are moved on a driven around a vertical axis of the machine rotor 3 on a labeling unit 4. The labeling unit 4 is u.a. controlled from one to a vertical axis synchronously with the rotor 3 circumferentially driven pallet carrier 5 with several on the pallet carrier via control cams

The FIG. 2 shows the heatable glue roller 10 in a schematic representation and in section. It consists essentially of a cup-like roller element 11 which is circumferentially driven by the vertical Leimwalzenachse LA by a drive, not shown, and of a ring segment 12 with circular cylindrical outer surface 12.1 and circular cylindrical inner surface 12.2 and arranged perpendicular to Leimwalzenachse LA and at one end with the circular segment associated circular disk-shaped bottom segment 13 is formed. The outer surface 12.1 of the ring segment 12 is the glued over the glue bar 10.1 circular cylindrical peripheral or glue surface of the glue roller 10th

With the bottom segment 13, the roller element 11 is mounted on a coaxial with the glue roller axis LA arranged shaft 14 which is rotatably mounted in a manner not shown in a machine frame of the labeling unit 4 and connected to the drive, also not shown. In the wall of the ring segment 12 at least one parallel to Leimwalzenachse LA extending bore 15 for receiving electrical temperature sensors 16.1 - provided 16.3, the temperature of the ring segment 12 corresponding measurement signals via an electrical rotary connection or rotary transformer 17 individually and preferably non-contact, eg capacitive or inductive or other suitable ones The rotary transformer 17 consists for example of a provided on the shaft 14 rotor 17.1, the inside of the roller element 11th is connected to the at least one temperature sensor 16.1 - 16.3 and from a stator 17.2, which is connected to the forwarding of the measuring signal to the measuring and control electronics 18.

The heating of the roller element or of the mantle or glue surface of the glue roller 10 forming ring segment 12 is carried out inductively by a plurality of electrical induction windings or coils 19.1, 19.2 and 19.3, which in the space enclosed by the ring segment 12 interior 20 of the roller element 11 and thus u.a. are also housed in a largely protected against contamination especially by glue space or volume, in such a way that the offset in the direction of Leimwalzenachse LA offset from each other and spaced annular induction coils 19.1 - 19.3 with their coil axes each coaxially arranged with the Leimwalzenachse LA are. Held are the induction coils 19.1 - 19.3 on a circular cylindrical surface of a core 21, which also extends coaxially with the axis Leimwalzenachse LA from above through the open end of the roller member 11 into the space 20 and at its upper end to a support arm or carrier 22 of the gluing station 7 is held, with the roller member 11 is not circulating.

The individually driven by a Ansteuer- or power stage 23 induction coils 19.1 - 19.3 form a heater 19 and are with its outer surface of the inner surface 12.2 of the ring segment 12 adjacent, but spaced from this inner surface. Furthermore, in the induction coil 19.1 - 19.3 at least one temperature sensor 16.1 - 16.3 assigned, which is in the illustrated embodiment each at the same or approximately the same axial height with the associated induction coil 19.1 and 19.3, ie, is arranged such that the respective temperature sensor 16.1 - 16.3 with its active, the temperature measuring area approximately in the Leimwalzenachse LA perpendicular intersecting center plane of the associated induction coil 19.1 and 19.3 is arranged. For heating the roller element 11 or of the ring segment 12, the induction coils 19.1-19.3 are supplied by the control or power electronics 23, for example with an alternating current, eg with a 50 Hz alternating current, to generate an alternating magnetic field and to induce eddy currents , Especially within the ring segment 12, which then cause the heating of this segment by electrical power loss. Adjacent induction coils 19.1 and 19.3 are each driven in opposite directions by the drive or power electronics 23. The regulation or control, in particular the temperature-dependent control or control of the currents through the induction coil 19.1 - 19.3 is done for example by a phase control.

In order to ensure a sufficiently high magnetic flux for the alternating magnetic field, at least the core 21, at least in its outer region, consists of a material with high magnetic conductivity. In order furthermore to induce eddy currents mainly in the ring segment 12 and to avoid them in the core 21 by the magnetic alternating field, the core 21 is formed by material selection and / or by appropriate design and / or structuring so that there is no or substantially no in the core closed flow paths for induced by the magnetic alternating field of the induction coils 19.1 - 19.3 eddy currents. The ring segment 12, however, consists of a material or a combination of materials, which has a high magnetic conductivity and at the same time a high electrical conductivity to ensure the highest possible magnetic flux for the respective alternating field, namely for the induction of the highest possible eddy currents.

By using a plurality of individually controllable induction coils 19.1 - 19.3, it is possible, for example, depending on the labels used and thus in dependence on the axial width, the glue application on the outer surface 12.1 of the ring segment 12 in the direction of Leimwalzenachse LA has to heat the peripheral surface 12.1 only on a partial area by appropriate control of the associated induction coil 19.1 - 19.3, for example, to save electrical energy, and / or by the individual control of the induction coils 19.1 - 19.3 for the most uniform temperature over the entire axial Height of the outer surface 12.1 to provide, for example, by an increased power of the two outer induction coils 19.1 and 19.3 and a correspondingly reduced power of the middle induction coil 19.2.

• ➢ So wird durch die induktive Beheizung die Leimwalze 10 dort, wo eine Erwärmung erforderlich ist, nämlich an der Außenfläche 12.1 des Ringsegments schnell und direkt aufgeheizt, ohne das weitere Bauteile, insbesondere auch Lager für die Welle 14 unnötig erwärmt werden.
• ➢ Durch die Induktionsspulen 19. - 19.3 erfolgt ein Beheizen des Ringsegmentes 12 am gesamten Umfang.
• ➢ Die Induktionsspulen 19.1 - 19.3 und die zugehörigen Temperatursensoren 16.1 - 16.3 bilden somit mehrere getrennt regelbare Heizzonen. Durch die Aufteilung in mehrere getrennte regelbare Heizzonen ist eine optimale Anpassung des Temperaturniveaus bzw. -verlaufs an der Außenfläche 12.1 in Richtung der Leimwalzenachse LA möglich.
• ➢ Durch die Messung der Temperatur mit den in dem Ringsegment 12 untergebrachten Temperatursensoren 16.1 - 16.3 ergibt sich eine Temperaturmessung mit hoher Genauigkeit.
• ➢ Sämtliche für das Beheizen der Leimwalze 10 bzw. des Walzenelementes 11 sowie für die temperaturabhängige Regelung oder Steuerung dienenden Elemente sind gegen Verschmutzung und mechanische Beschädigung geschützt untergebracht, nämlich bei der dargestellten Ausführungsform die Induktionsspule 19 - 33 im Innenraum 20 des Walzenelementes 11 und die Temperatursensoren 16.1 - 16.3 in der wenigstens einen Bohrung 15.
• ➢ Keines der für das Beheizen und/oder die Temperaturregelung oder - steuerung dienenden Elemente befindet sich somit innerhalb eines Bereichs der Beleimungsstation 7, der einer erhöhten Verschmutzung unterliegt.
• ➢ Die Aufheizzeit des Walzenelements 11 kann stark reduziert werden, beispielsweise auf maximal fünf Minuten, während bei bekannten Beleimungsstationen mit beheizten Leimwalzen Aufheizzeiten bis zu 30 - 45 Minuten erforderlich sind.
• ➢ Durch die Erfindung wird somit die Verfügbarkeit der Beleimungsstation 7 bzw. des Etikettieraggregats wesentlich verbessert.
• ➢ Dadurch, dass die Heizleistung bei der erfindungsgemäßen Leimwalze auf den tatsächlich zu beheizenden Bereich, nämlich auf das Ringsegment 12 und dessen Umfangsfläche 12.1 konzentriert wird, ergeben sich weiterhin auch eine merkliche Reduzierung der für das Beheizen notwendigen Leistung und damit eine erhebliche Energieeinsparung. So kann beispielsweise die Heizleistung der beheizbaren Leimwalze 10 von den bei derartigen Leimwalzen bisher üblichen 1,2 KW auf 0,5 KW reduziert werden.

The glue roller 10 has considerable advantages in particular over known heatable glue rollers:

• ➢ Thus, the inductive heating, the glue roller 10 where heating is required, namely heated on the outer surface 12.1 of the ring segment quickly and directly without the other components, especially bearing for the shaft 14 are unnecessarily heated.
• ➢ Through the induction coils 19. - 19.3 takes place a heating of the ring segment 12 on the entire circumference.
• ➢ The induction coils 19.1-19.3 and the associated temperature sensors 16.1-16.3 thus form several separately controllable heating zones. Due to the division into several separate controllable heating zones, an optimal adaptation of the temperature level or course on the outer surface 12.1 in the direction of the glue roller axis LA is possible.
• ➢ By measuring the temperature with the accommodated in the ring segment 12 temperature sensors 16.1 - 16.3 results in a temperature measurement with high accuracy.
• ➢ All elements used for heating the glue roller 10 or the roller element 11 and for the temperature-dependent control or control are protected against contamination and mechanical damage, namely in the illustrated embodiment, the induction coil 19 - 33 in the interior 20 of the roller element 11 and the temperature sensors 16.1-16.3 in the at least one bore 15.
• ➢ None of the elements used for the heating and / or the temperature control or control is thus within a range of the gluing station 7, which is subject to increased contamination.
• ➢ The heating time of the roller element 11 can be greatly reduced, for example to a maximum of five minutes, while in known Beleimungsstationen with heated glue rollers heating times up to 30 - 45 minutes are required.
• ➢ Thus, the availability of the gluing station 7 or of the labeling unit is substantially improved by the invention.
• ➢ The fact that the heating power is concentrated in the glue roller according to the invention on the actually heated area, namely on the ring segment 12 and its peripheral surface 12.1, continue to result in a significant reduction of the power required for heating and thus a significant energy savings. Thus, for example, the heating power of the heatable glue roller 10 can be reduced from 0.5 kW, which has hitherto been the case with such glue rollers, to 0.5 KW.

The invention has been described above by means of an exemplary embodiment. It is understood that numerous changes and modifications are possible. It has been assumed above that the induction coils 19.1-19.3 are operated with alternating current. In principle, there is also the possibility of the induction coil 19.1 - 19.3 with rotating roller element 11, i. to control with DC during operation of the labeling unit 4. The control of the induction coils 19.1 - 19.3 with alternating current then takes place, for example, only during a heating phase, i. at non-rotating or only at low speed rotating roller element 11th

To improve the magnetic flux, it may also be expedient to increase the diameter of the core 21 such that the core 21 made of a material having high magnetic conductivity extends with its peripheral surface into the vicinity of the inner surface 12. 2 and between the core 21 and the core Inner surface 12.2 only a narrow magnetic gap remains, as in the FIG. 2 with the broken ones Lines 21.1 is indicated. The core 21 is formed on its peripheral surface with grooves, in which then the induction coils 19.1 - 19.3 are added, so that there is a very low magnetic resistance for the magnetic flux of the alternating field.

It has been assumed above that the induction coils 19.1-19.3.3 each consist of a winding which is rotationally symmetrical with respect to the glue roller axis LA on the core 21 and are arranged with its axis coaxially with the glue roller axis LA. However, it is also possible to arrange one or more induction coils, for example consisting of a plurality of individual windings or coils within the space 20 such that these induction coils are oriented with their axes radially to the glue roller axis LA. The non-rotating core carrying the induction coils or their individual windings is then designed, for example, corresponding to the laminated core of the armature or rotor of an electric motor, with grooves in which the windings forming the induction coil or its individual coils are accommodated.

LIST OF REFERENCE NUMBERS

1

labeling

2

bottle

3

rotor

4

labeling

5

pallet carrier

6

label range

7

gluing station

8th

label magazine

9

gripper cylinder

10

glue roller

10.1

adhesive strip

11

revolving roller element

12

ring segment

12.1

Outer surface of the ring segment and thus of the roller element eleventh

12.2

Inner surface of the ring segment

13

ground segment

14

wave

15

drilling

16.1-16.3

temperature sensor

17

electric rotary transformer

17.1

Rotor of the rotary transformer 17th

17.2

Stature of Drehübertragers 17th

18

Measuring and control electronics

19

heater

19.1-19.3

induction coil

20

Interior of the roller element 11th

21

core

22

Carrier or support arm

23

Control or power electronics

LA

Leimwalzenachse

Claims (18)

1. Labelling device for labelling machine with at least one electrically heatable gluing roller (10), with a roller element (11) which can be driven circulating around a gluing roller axis (LA) and forms at least one circumferential or gluing surface surrounding the gluing roller axis (LA) and formed rotationally symmetrical to this axis for a glue application to be transferred at least partly to labels, with a heating device (19) comprising at least one induction coil (19.1 - 19.3) for heating the roller element (11) at least on the gluing surface (12.1) with currents induced in the roller element (11), and with at least one temperature sensor (16.1 - 16.3) for detecting the temperature of the roller element (11) on at least one region of the at least one gluing surface (12.1), characterised in that the at least one heating device (19) is accommodated completely in a space (20) located inside the gluing surface (12.1) or its imaginary extension in the direction of the gluing roller axis (LA), and that the at least one temperature sensor (16.1 - 16.3) on the roller element (11) is accommodated protected, in particular protected against soiling and/or mechanical damage.
2. Labelling device according to claim 1, characterised in that the at least one heating device (19) comprises at least two induction coils (19.1 - 19.3), preferably at least three induction coils (19.1 - 19.3), and that the induction coils (19.1 - 19.3) can be controlled individually.
3. Labelling device according to claim 2, characterised in that at least one temperature sensor (16.1 - 16.3) is allocated to each induction coil (19.1 - 19.3).
4. Labelling device according to any one of the preceding claims, characterised in that the at least one heating device (19) is arranged in the interior space (20) of the roller element (11) forming the gluing surface (12.1).
5. Labelling device according to any one of the preceding claims, characterised in that the at least one gluing surface is a circular cylindrical surface (12.1) concentrically surrounding the gluing roller axis (LA).
6. Labelling device according to any one of the preceding claims, characterised in that the at least one heating device (19) or the space containing the at least one induction coil (19.1 - 19.3) comprises an inner surface (12.1) concentrically surrounding the gluing roller axis (LA) and formed rotationally symmetrically to this axis, and that the heating device (19) or the at least one induction coil (19.1 - 19.3) is arranged adjacent to this inner surface (12.2).
7. Labelling device according to claim 6, characterised in that the inner surface (12.2) is a circular cylindrical surface concentrically surrounding the gluing roller axis (LA).
8. Labelling device according to any one of the preceding claims, characterised in that the at least one heating device (19) or the at least one induction coil (19.1 - 19.3) is provided not rotating with the roller element (11) forming the at least one gluing surface (12.1).
9. Labelling device according to any one of the preceding claims, characterised in that the at least one induction coil (19.1 - 19.3) is designed rotationally symmetrical or substantially rotationally symmetrical about a coil axis and is arranged with its coil axis coaxial to the gluing roller axis (LA).
10. Labelling device according to claim 9, characterised in that in the case of several heating devices (19) or induction coils (19.1 - 19.3), these are provided offset in the direction of the gluing roller axis (LA).
11. Labelling device according to any one of the preceding claims, characterised in that the at least one induction coil (19.1 - 19.3) is provided on a core (21).
12. Labelling device according to claim 11, characterised in that the core (21) at least in its region adjacent to the at least one induction coil (19.1 - 19.3) consists of a material with high magnetic conductivity.
13. Labelling device according to claim 11 or 12, characterised in that the core (21) is formed by material selection and/or constructional design and/or structuring so that an eddy current formation in the core (21) is at least largely prevented.
14. Labelling device according to any one of the preceding claims, characterised in that the roller element (11) at the heated region comprises a material or a material combination with high electric and/or high magnetic conductivity.
15. Labelling device according to any one of the preceding claims, characterised by at least two temperature sensors (16.1 - 16.3) to determine the temperature at the different regions of the at least one gluing surface (12.1).
16. Labelling device according to any one of the preceding claims, characterised in that the at least one temperature sensor (16.1 - 16.3) provided on the roller element (11) is connected with measuring and control electronics (18) via a rotary transmitter, preferably via a contactless rotary transmitter.
17. Labelling device according to any one of the preceding claims, characterised in that in the case of several heating devices or induction coils (19.1 - 19.3), at least one temperature sensor (16.1 - 16.3) is allocated to each heating device or each induction coil (19.1 - 19.3).
18. Labelling device according to any one of the preceding claims, characterised in that a carrier or core (21) with the at least one heating element (19) or the at least one induction coil (19.1 - 19.3) extends from an open face of the roller element (11) into the interior space (20) formed by this element.

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