EP2724950B1 - Gluing unit - Google Patents

Description

The invention relates to a gluing unit, in particular for a labeling device, with a glue roller and a motor for driving the glue roller.

Such gluing units are known, for example for labeling machines for labeling bottles in the beverage industry. The glue roller is used to transfer glue to so-called pallets, which in turn apply the glue to the back of the labels to be attached. About a gripper cylinder, the labels are then removed from the pallets and applied to the appropriate container.

In known gluing plants, the glue rollers are usually attached to a polygonal shaft. The shaft is ball-bearing at the lower end in the housing. The upper end of the shaft is counter-supported in a hinged lid. To change the glue roller, the lid is opened and the glue roller is then pulled off the shaft upwards.

The glue roller has a continuous hub with polygonal profile. The shaft-hub connection should be as free of play and yet be carried out releasably. This is achieved in known glue rollers in that a suitable material selection is made. The shaft is usually made of stainless steel, while the hub is made of a copper and / or brass alloy. This results in a composite construction, which is correspondingly expensive. In addition, the internal centering requires heavy castings, so that the mass of the known glue rollers is correspondingly large. This is also ergonomically unfavorable, since the expansion of known glue rollers is usually carried out by lifting, as described above.

There are also glue rollers known that can be removed laterally. This is ergonomically cheaper, since lifting the heavy glue roller can be largely avoided. However, it is quite complicated in the known systems to separate the connection between glue roller and drive motor.

From the DE 10 2008 038 147 A1 For example, a gluing device for a labeling machine is known which comprises a glue roller with a drive shaft.

The post-published EP 2 610 188 A1 discloses a glue roller, which is rotatably suspended at its lying above a support structure end in a supported on the support structure support hanging and is in direct drive connection with a top mounted on the storage electric servomotor, wherein, preferably, the glue roller above in or with the storage can be removed laterally.

Object of the present invention is therefore to provide a gluing unit that allows easier removal of the glue roller. This object is achieved with a gluing unit according to claim 1.

For this purpose, the invention provides a gluing unit, in particular for a labeling apparatus, comprising a glue roller and a motor for driving the glue roller, the motor being arranged above the glue roller, the motor being mounted so as to be vertically variable with respect to a supporting structure of the motor, and wherein Height of the engine via a lever is variable, in particular via a toggle lever or a rocker arm.

Due to the height-adjustable mounting of the motor, it is possible to remove the glue roller, first lift the engine and then remove the glue roller side. By using a lever, the force required to adjust the height position of the motor for an operator can be reduced.

The motor may in particular be a direct drive motor, for example it may be an electric servomotor. Thus, an individual speed control can be achieved. This is useful, for example, in normal operation to achieve an exact synchronization between the surface speed of the glue roller and the Abwälzbewegungsgeschwindigkeit a label pallet. This in turn can improve the quality of the glue transfer.

The gluing unit can be designed in particular for a labeling device for labeling containers in the beverage industry, in particular for labeling bottles. The glue roller can be designed to transfer hot glue or cold glue.

The motor can be brought from an operating position in a first height position into a removal position in a second height position, wherein the glue roller can be removed in the removal position by a lateral movement of the gluing unit.

The engine may be arranged higher in the removal position, in particular, than in the operating position. In other words, the motor may be liftable from the first height position to the second height position.

In the operating position, the glue roller can be fixed in the gluing unit.

The gluing unit comprises an adjusting device for the motor, which is designed such that with this the height position of the motor is variable.

The motor may in particular be displaceably mounted along a guide, in particular along a linear guide. As a result, a controlled change in position of the engine can be achieved. The motor can be connected via the guide with the support structure. The guide can in particular be supported or mounted on the support structure. The guide may comprise at least one spar, in particular two spars.

It is expedient to arrange the axis of the glue roller, in particular its longitudinal axis, approximately vertically during operation of the gluing unit.

The motor can therefore be displaceably mounted, in particular along a substantially vertical axis. The vertical axis may in particular be an axis parallel to the longitudinal axis of the glue roller. The vertical axis may also correspond to the longitudinal axis of the glue roller.

The lever can be designed as a rocker arm. On the rocker arm, a switching roller can be fixed, which slides in a cam groove. The cam groove may be attached to the motor housing. Switching roller and cam groove may in particular be arranged such that by folding the rocker arm of the engine is adjustable in height. In addition, a spring can be attached, which presses the engine down. As a result, on the one hand the connection to the glue roller can be kept under tension; on the other hand, the motor can thus be held in position in the upper position by the spring overpresses the rocker arm in a dead position.

The lever, in particular in the form of a toggle lever or a rocker arm, is part of the above adjustment.

The gluing unit may also include a glue scraper. Thus, the glue can be applied in a predetermined manner precisely on the surface of the glue roller.

In particular, the glue scraper may comprise a first locking element, and the labeling device may further comprise a holder for the glue scraper, which comprises a second locking element, wherein the locking elements can be locked together by rotation of one or both locking elements. This also allows a quick and easy replacement of the glue scraper.

Locking can be understood here in particular as meaning that the two locking elements can be connected to one another in a form-fitting manner. A screw, for example, is not to be regarded as a lock.

The locking elements can be locked together in particular by rotation of one or both locking elements about the respective longitudinal axis of the locking elements. In other words, either the first locking element or the second locking element or the first locking elements and the second locking element can each be rotated about its longitudinal axis to produce a locking of the two elements together.

The first or the second locking elements may in particular be a spout, a tube piece, a part of a shaft or a part of an axle.

In particular, the second locking element may be part of a cylindrical axis of rotation. In other words, the holder or storage for the glue scraper may be an axis of rotation, in particular a substantially cylindrical axis of rotation.

One of the locking elements may have a recess, wherein the recess and the other locking element are formed such that the other locking element can be introduced into the recess in a first orientation and is connected after rotation in a second orientation positively with the one locking element.

For example, the recess may be a cylindrical receiving bore which is exposed or slotted at one point. In this case, the other locking element may be formed such that it can be inserted at the slotted point in a first orientation in the cylindrical receiving bore, wherein it is designed such that it no longer rotates by the exposure or the slot from the receiving bore can be removed, so it is positively connected to the receiving bore having locking element.

To release the connection or locking one or both locking elements can be rotated again accordingly, so that the positive connection can be canceled. For example, a locking element can be rotated again in the first orientation, so that it can be removed from the recess.

As an example, one of the locking elements may have a circular cross-section with two opposing flats, and the other of the locking elements may have a U-shaped receptacle with a widening, wherein the one of the locking elements fits into the U-shaped receptacle due to the flattening and by rotation can be locked in the region of the expansion with the other of the locking elements. As a result, a particularly simple locking can be made possible. The locking element with the opposing flattenings may in particular be the second locking element. The locking element with the U-shaped receptacle may in particular be the first locking element.

The locking element with two opposing flattenings can in particular have the flattening only in a first subsection, while in a second subsection the cross section is completely circular. In this case, the gluing unit can be designed in this way be that the locking elements by rotation of one or both locking elements and a displacement of one or both locking elements along the longitudinal axis of one or both locking elements are locked together, so that after the displacement along the longitudinal axis, the receptacle of a locking element is arranged in the portion of the other locking element which has a completely circular cross-section. By such a construction, an unwanted solution of the lock can be effectively prevented. To release the lock can then be carried out again a displacement along a longitudinal axis and a corresponding rotation.

The first and second locking element may be formed such that a rotation of one or both locking elements in a certain angular range is possible without loosening the connection or locking. As a result, the low twisting of the glue scraper required for adjusting the glue film thickness can be made possible.

The glue roller can take on a cylindrical casing, on the upper and lower opening of which a cover plate is arranged in each case, and wherein one of the cover plates comprises a toothing, in particular a Hirth toothing, for connecting the glue roller to a drive motor. By gearing so a torque transmitting rotary coupling can be made with the engine, in particular a Hirth coupling. This has the advantage that this coupling can be easily engaged and disengaged even in confined spaces only by a tilting movement.

The teeth may have regularly distributed, equal teeth or interdental spaces in the circumferential direction. In this case, an additional positioning device for a predetermined engagement position between the teeth of the glue roller and the toothing of the drive motor can be provided. This may be, for example, a centering pin or a receptacle for a centering pin. At the toothing of the drive motor, the respective complementary centering can be provided.

Alternatively, the teeth may also have an irregular arrangement of the teeth. In this case, the irregular arrangement of teeth can serve the positioning, since a positive connection to an irregular arrangement of teeth in a toothing of the rotary motor is possible only at an angular position.

To connect the glue roller with a mounting device or storage device, one of the cover plates can have a receiving cone as a counterpart of a centering tip of the mounting device include. In particular, these may be the other cover plate, ie those which are opposite the cover plates with the toothing.

The recording cone can also be referred to as a centering recess. A connection with a centering tip enables a particularly safe and low-wear centering.

Alternatively, for connecting the glue roller with a holding device, a centering tip can also be provided which is arranged on the cover plate, in particular connected thereto.

In particular, the gluing unit may comprise a magnetic axial securing device for stabilizing the position of the glue roller in a mounted position. The magnetic axial securing may in particular comprise a magnet, which is arranged in particular in the region of the Hirth toothing. For example, one or more tooth elements can be formed by a magnet, in particular a permanent magnet.

Alternatively or additionally, one or more magnets may also be mounted in the toothed ring of the motor.

It is also conceivable to use a non-positive and / or positive axial locking, for example in the form of a clamping screw or a bayonet coupling.

The rotor of the motor may be thermally isolated from the rotor shaft. This can prevent the heating of the motor from being transmitted to the glue roller. Increased Tem ^perature would allow to dry the glue film.

The thermal insulation can be achieved for example by a thermosetting fiber composite material. Thermoplastic plastics, in particular with fiber reinforcement, are also conceivable.

The cylindrical shell may have a thickness of 1 mm to 5 mm, in particular of 1.5 mm to 3 mm. As a result, a particularly simple design of the glue roller is possible.

The cylindrical shell may in particular comprise stainless steel or consist of stainless steel.

The cylindrical jacket may also comprise or consist of a carbon fiber reinforced plastic (CfK). This further weight reduction is possible.

In the carbon fiber reinforced plastic at least one annular element made of a metal, in particular steel, may be incorporated, wherein the at least one annular Element is arranged in particular in the region of the upper or lower edge of the cylindrical shell. Such a ring-shaped element can provide a sharp edge at the edges of the cylindrical surface, allowing for precise wiping of the glue.

The cylindrical jacket can be coated with a, in particular metallic, wear-resistant layer, in particular on the outside thereof.

For example, at least the outside of the cylindrical shell may be hard chrome plated. The hard chrome layer can serve as a wear protection layer for the contact of the glue roller with a glue scraper when stripping the glue. The cylindrical shell can also be completely hard-chrome plated. The cover plates can be partially or completely hard chrome plated.

The hard chrome layer may have a thickness of 30 .mu.m to 60 .mu.m, advantageously from 60 .mu.m to 150 .mu.m.

As an alternative to hard chrome plating, other coatings and / or hardenings are also conceivable. For example, at least the outside of the cylindrical shell may be provided with a gel coat or a chromium oxide coating. At least the outside of the cylindrical shell may alternatively or additionally also be plasma-nitrided.

At least a part of the outside of the cylindrical shell may be formed such that the surface in this part has a roughness (average roughness Ra) of less than 2 μm, in particular less than 1 μm. A roughness depth of Ra = 0.03 μm to 0.06 μm has proved to be advantageous. In particular, a wear protection layer described above may have said surface roughness.

The part of the outside of the cylindrical shell which has said roughness depth may in particular be the part which comes into contact with the glue scraper in operation. With such a smooth surface, a uniform glue application can be achieved. In addition, such a surface can be cleaned well. It can also have the entire outside of the cylindrical shell such a roughness.

At least a part of the outside of the cylindrical shell may be formed so that the surface in this part has a surface hardness of 53 HRC (Rockwell C) to 62 HRC. This can be achieved in particular by a wear protection layer described above. A hardness of 68 HRC to 72 HRC has proven to be advantageous (corresponds to 900 HV (Vickers hardness) to 1200 HV).

In particular, the part of the outside of the cylindrical shell which has the stated hardness can again be the part which comes into contact with the glue scraper in operation. As a result, an advantageous abrasion resistance or wear resistance can be achieved. Also, the corrosion resistance can be improved. It may also have the entire outside of the cylindrical shell such a surface hardness.

The cover plates can be welded to the cylindrical jacket, in particular laser welded.

The inside of the glue roller can be hollow. In other words, the space within the cylindrical shell and between the two cover plates may be free of other elements. As a result, a further weight reduction can be achieved.

The two cover plates may also have a small thickness or material thickness, in particular between 3 mm and 6 mm.

On the inner surface of the cylindrical shell, one or more stiffening elements, in particular stiffening rings, can be arranged. The stiffening elements may in particular be welded to the inside of the jacket. By the stiffening elements, a higher stability can be achieved even if the cylindrical shell is thin-walled.

Alternatively or additionally, a foam may be arranged at least in a part of the interior of the glue roller. The foam can in particular fill the entire cavity in the interior of the glue roller. The foam also stabilizes the jacket.

The foam may for example correspond to a foamed plastic, in particular polyurethane foam.

The gluing unit according to the invention can also be designed for a labeling device.

The labeling device may in particular be a labeling device for labeling containers in the beverage industry, in particular for labeling bottles.

The labeling apparatus may further comprise a pallet carousel having a plurality of pallet shafts, a label magazine and a gripper cylinder. With these elements, the labels could first be provided with a glue and then placed on the gripper cylinder on containers, such as bottles. The individual elements of the labeling device can be arranged on a common support structure. In this case, the engine is mounted on this support structure. But it is also possible that the main components, in particular the engine, are mounted on their own support structures.

Figur 1

ein beispielhaftes Leimwerk für eine Etikettiervorrichtung;

Figur 2

eine Detailansicht der Leimwalze eines beispielhaften Leimwerks;

Figuren 3Aund 3B

Details zur höhenverstellbaren Lagerung eines Motors eines beispielhaften Leimwerks;

Figur 4

einen Querschnitt durch einen Motor eines beispielhaften Leimwerks;

Figur 5

eine Draufsicht auf einen Verriegelungsmechanismus für einen Leimschaber eines beispielhaften Leimwerks in einer ersten Position;

Figur 6

einen Verriegelungsmechanismus gemäß Figur 5 in einer zweiten Position;

Figur 7

einen Verriegelungsmechanismus gemäß Figuren 5 und 6 in einer dritten Position;

Figur 8

eine perspektivische Ansicht eines beispielhaften Leimwerks;

Figur 9

einen Querschnitt durch eine beispielhafte Leimwalze;

Figur 10

einen Querschnitt durch eine beispielhafte Leimwalze in einer Einbaulage; und

Figuren 11A bis 11C

Details zur höhenverstellbaren Lagerung eines Motors eines weiteren beispielhaften Leimwerks.

Further features and advantages of the invention will be explained below with reference to the exemplary figures. Showing:

FIG. 1

an exemplary gluing unit for a labeling device;

FIG. 2

a detailed view of the glue roller of an exemplary gluing unit;

Figures 3A and 3B

Details of the height-adjustable mounting of a motor of an exemplary gluing plant;

FIG. 4

a cross-section through a motor of an exemplary gluing unit;

FIG. 5

a plan view of a locking mechanism for a glue scraper of an exemplary gluing unit in a first position;

FIG. 6

a locking mechanism according to FIG. 5 in a second position;

FIG. 7

a locking mechanism according to Figures 5 and 6 in a third position;

FIG. 8

a perspective view of an exemplary gluing unit;

FIG. 9

a cross-section through an exemplary glue roller;

FIG. 10

a cross section through an exemplary glue roller in a mounting position; and

FIGS. 11A to 11C

Details on the height-adjustable mounting of a motor of another exemplary gluing unit.

FIG. 1 shows parts of an exemplary gluing unit. The gluing unit can be part of a labeling device, in particular for liquid containers such as bottles. For clarity, known elements such as label magazine, pallet carousel and gripper cylinder are not shown.

The gluing unit shown comprises a glue roller 1 with a motor 2 for driving the glue roller 1. The motor is arranged above the glue roller 1 during operation. This has the advantage that when cleaning the water can run down and thus there is little risk that water passes through a potentially vulnerable rotary seal in the engine 2. The motor 2 is mounted on two columns or spars 4, 5 on a support structure 3, in particular a steel plate, height-adjustable. In other words, the bearing of the motor 2 is designed such that the height of the motor 2 is variable over the support structure 3.

In the upper region 6 of the glue roller 1, the glue roller 1 is connected to the motor 2 via a rotary coupling, in particular a Hirth coupling. In the lower region 7 of the glue roller 1, the glue roller 1 is connected to a holder or mounting for the glue roller 1. Especially the glue roller 1 can be mounted there by means of a centering tip and a corresponding centering cone for receiving the centering tip. As a result, a particularly stable storage is possible. The underside of the glue roller 1 can thus comprise either a centering tip or a centering cone.

FIG. 2 shows a further detailed view of the exemplary gluing unit. In addition to the columns 4, 5, the glue roller 1 with the upper portion 6 and the lower portion 7, in this figure, a glue scraper 10 is shown, which also includes a scraper to remove glue residue from the glue roller 1.

FIG. 3 shows details for mounting the motor 2 on the glue roller 1, in particular an adjusting mechanism for changing the height of the motor 2 on the support structure. 3

The adjusting device comprises a toggle lever 23. In the in FIG. 3A shown position of the toggle lever, the motor 2 is arranged in a height position in which the connection between glue roller 1 and motor 2 is separated. Between the gear elements 21 of the glue roller 1 and the counter toothed ring 22 of the motor 2, a distance is thus formed, which makes it possible that the glue roller 1 is removed laterally by tilting. The distance between the glue roller 1 and the motor 2 is in FIG. 3A illustrated by a double-sided arrow.

The motor 2 can be displaced along guide rods (ie a linear guide) substantially along a vertical axis.

When the toggle 23, as in FIG. 3B shown, is brought into a second position, the height position of the motor 2 may change so that the teeth 22 and 21 are brought into engagement, so a drive connection between the motor 2 and glue roller 1 is made.

The gluing unit may also include a magnetic axial lock to stabilize the position of the glue roller in a mounted position. In this case, the glue roller in contrast to FIG. 3A also be raised by the magnetic force effect together with the engine. For lateral removal of the glue roller, the magnetic axial securing over a tilting movement of the upper end of the glue roller can be solved.

In the case of a non-positive and / or positive axial securing, it may be necessary to bring the non-positive and / or positive axial lock in a release position prior to the lateral removal of the glue roller.

FIG. 4 shows a cross section through an exemplary motor 2. The rotor shaft 31 is separated by a thermal insulation 33 from the rotor 32. This can be prevented that a heating of the motor 2 is transmitted to the glue roller 1 and thus the glue film dries on the glue roller. The engine 2 also includes an outer housing 30 which protects the moving parts of the engine 2.

FIG. 5 11 illustrates an exemplary locking mechanism for a squeegee 10. For this, the squeegee 10 includes a first locking member 40 having a U-shaped receptacle with a widening 41. This widening 41 is formed as a cylindrical receiving bore. Through a recess 42 in the locking element 40, the widening 41 is accessible from the outside.

A holder or mounting for the glue scraper 10, which is connected, for example, to the support structure, comprises a second locking element 43, which has a circular cross-section, which is provided with two opposite flattenings 44 and 45. The distance between the flats 44 and 45 corresponds to the extent of the recess 42 in the first locking element 40.

Due to the flattening 44, 45, the locking element 43 thus fits in the U-shaped receptacle, in particular in the recess 42, provided that the locking element 43 is arranged in the correct orientation, in which the flats 44, 45 are aligned with the edges of the recess 42 ,

In FIG. 5 In addition, the upper part 46 of the glue scraper 10 and the glue roller 1 can be seen.

FIG. 6 shows the locking system of FIG. 5 as described above, but wherein the second locking element 43 has been introduced through the recess 42 in the expansion in the form of a cylindrical receiving bore. In this orientation, however, there is still no complete positive connection between the locking elements 40 and 43. The locking element 43 could in turn be disengaged by the receptacle 42.

FIG. 7 shows that in Figures 5 and 6 described locking system, wherein the locking elements 40, 43 were locked by rotation of the first locking member 40 about its longitudinal axis with each other. In other words, a positive connection between the locking elements 40, 43 has been produced by the rotation.

In FIG. 8 is a perspective view of the gluing unit to see, with the glue scraper 10 is connected via a locking mechanism described above with a receptacle or bearing axis 50. The first locking element 40 with the recess 42 is shown. In addition, one of the flats 44 of the second locking element can be seen. Here, after the rotation, a translation of the glue scraper 10 was also made in a direction parallel to the longitudinal axis of the receiving axis 50, in this case downwards. As a result, the first locking element 40 has been displaced into a region of the axis 50 in which the cross section of the axis 50 is completely circular. Thus, a safer connection can be made, since unlocking requires first a slight lifting of the glue scraper 10 and a subsequent rotation.

FIG. 9 shows a cross section through an exemplary glue roller 1. This can, as shown, in particular be made in lightweight construction. The glue roller 1 comprises a cylindrical jacket 51, which may comprise, for example, steel and / or carbon fiber reinforced plastic (CfK - carbon fiber reinforced plastic). The jacket 51 may be formed thin-walled, in particular with a thickness or material thickness of 1 mm to 5 mm, in particular from 1.5 mm to 3 mm. In the interior 59 of the glue roller 1 stiffening rings 57, 58 may be arranged to reinforce the thin-walled sheath 51. Except for the stiffening rings 57, 58, the interior 59 of the glue roller 1 may be hollow. However, the interior 59 may also be filled with a foamed material. By this foam, an additional stabilization of the glue roller can be achieved, yet the weight can be kept low.

At the upper and lower end of the cylindrical shell 51 cover plates 52, 53 are arranged. On the upper cover plate 52 toothing elements 56 are arranged, in particular a Hirth toothing in order to establish a connection with the drive motor can. In the region of the toothed elements 56, a permanent magnet can also be arranged. This can serve as axial securing for the glue roller 1.

In the lower cover plate 53, a receiving cone 54 is provided, the surface 55 serves as an abutment to a centering tip of a mounting device. To the lower cover plate 53 is still a Wandungsverlängerung 60 connected, which protects the connection area between glue roller and mounting device from glue. The Wandungsverlängerung 60 may be integrally formed with the lower cover plate 53 or be connected to this, in particular cohesively.

In FIG. 10 is the exemplary glue roller 1 from the FIG. 9 shown in installation position. In this case, the centering tip 60 of the mounting device can be seen. About this centering tip 60, the glue roller 1 is mounted on a support structure 3.

Also visible is the gear rim 61 of the motor 2, which is in communication with the toothed elements 56 of the glue roller 1, so that the torque can be transmitted from the motor to the glue roller 1.

The motor 2 may in particular be a servomotor or a stepper motor.

In the FIGS. 11A to 11C is shown a part of an exemplary gluing unit in which the height of the motor 2 with the aid of a rocker arm 70 is adjustable. On the rocker arm 70, a switching roller 71 is fixed, which slides in a cam groove. The cam groove is attached to the motor housing. Switching roller 71 and cam groove are arranged such that by folding the rocker arm, the motor is adjustable in height. In addition, spring elements 72, 73 are mounted, which press the motor 2 down. As a result, on the one hand the connection to the glue roller can be kept under tension; on the other hand, the motor 2 can thus be held in position in the upper position by the springs 72, 73 overpress the rocker arm 70 in a dead position.

It is understood that features mentioned in the embodiment described above are not limited to these specific combinations and are also possible in any other combinations, as long as they do not depart from the inventive framework defined by the following claims.

Claims (13)

1. Gluing unit, in particular for a labeling apparatus, comprising a glue roller (1) and a motor (2) for driving said glue roller (1), where said motor (2) is positioned above said glue roller (1), where said motor (2) is with respect to a support structure (3) of said motor (2) mounted in a height-adjustable manner, where the height position of the motor is adjustable using an adjustment apparatus of the gluing unit, where the height of said motor (2) is adjustable using a lever, which is part of the adjustment apparatus, in particular using an elbow lever (23) or a rocker lever, and
   where said motor (2) can from an operating position in a first height position be brought to a removal position in a second height position, where said glue roller (1) can in the removal position be removed from the gluing unit by a lateral motion.
2. Gluing unit according to claim 1, where said motor (2) is mounted movable along a guide, in particular along a linear guide.
3. Gluing unit according to one of the preceding claims, where said motor (2) is mounted movable along an essentially vertical axis
4. Gluing unit according to one of the preceding claims, further comprising a glue wiper (10) comprising a first locking element (40), and a support for said glue wiper (10) comprising a second locking element (43), where said locking elements (40, 43) can be locked with each other by rotation of one or both locking elements (40, 43).
5. Gluing unit according to claim 4, where said first or said second locking element (40, 43) can be a socket, a part of a pipe, or a part of a shaft, or a part of an axle.
6. Gluing unit according to claim 4 or 5, where one of said locking elements (40) comprises a recess (42), and where said recess (42) and said other locking element (43) are configured such that said other locking element (43) in a first orientation can be introduced into said recess (42) and, following a rotation, in a second orientation is connected with said one locking element (40) in a positive-fit manner.
7. Gluing unit according to one of the claims 4 to 6, where one of said locking elements (43) has a circular cross-section with two oppositely disposed flattened portions (44, 45), and the other of said locking elements (40) has a U- shaped seat with a widening (41), where said one of said locking elements (43), due to the flattened portions (44, 45) fits into said U-shaped seat and can be locked with said other of said locking elements (40) by rotation in the area of the widening (41).
8. Gluing unit according to one of the preceding claims, where said glue roller (1) comprises a cylindrical jacket (51), on each upper and lower opening of which a lid plate (52, 53) is arranged, and where one of said lid plates (52) comprises a gearing (56), in particular a Hirth-type serration, for connecting said glue roller (1) with a drive motor (2).
9. Gluing unit according to one of the preceding claims, where said glue roller (1) comprises a cylindrical jacket (51), on each upper and lower opening of which a lid plate (52, 53) is arranged, and where one of said lid plates (53) comprises one or more elements for connecting said glue roller (1) with a support device of a labeling apparatus.
10. Gluing unit according to claim 9, where said lid plate (53) for connecting said glue roller (1) to a support device comprises a centering tip (60) or a receiving cone (54) as a counterpart to a centering tip (60) of said support device.
11. Gluing unit according to one of the preceding claims, comprising a magnetic axial lock for stabilizing the position of said glue roller (1) in an installed position.
12. Gluing unit according to one of the preceding claims, where the rotor (32) of said motor (2) is thermally insulated from the rotor shaft.
13. Gluing unit according one of the claims 10 - 13, where said cylindrical jacket (51) has a thickness from 1 mm to 5 mm, in particular from 1.5 mm to 3 mm.

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