DE8915663U1 - Labeling station for objects, especially bottles - Google Patents

Description

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02.11.1990 KN/HW 49052G

ETI-TEC Maschinenbau GmbH

Psidhe.r.-i*er Straße 45 D - iJC:5 Erkrath 2

Labelling for objects, especially bottles

The invention relates to a labeling station for objects, in particular bottles, with several stations arranged one behind the other along a track, namely a glue roller, a label box and a label transfer cylinder and with at least one removal element for the labels which is rotatably mounted on a rotating carrier and moves past the stations at a different angular speed with each revolution of the carrier, each of which has an outwardly curved receiving surface for the label which rolls along the stations, whereby a cam gear is provided as the drive for each removal element, which consists of a fixed double cam disk common to all removal elements with one-sided outer curves arranged one above the other in two planes and of two sets of two engagement members each, which

are mounted at an angle to one another on the drive shaft or a bearing shaft coupled to it by means of a carrier element and, by means of a positive connection with the two curves when the carrier rotates, ensure the forced movement of each extraction element over its full rotation, whereby the axes of all engagement elements lie within the gear pole curve of the cam gear and at least one engagement element, in particular all engagement elements, lie partially outside the gear pole curve.

In order to be able to rotate the removal elements at the various stations on labeling machines in the same direction at different angular speeds over their entire rotation, various cam-controlled drives are known.

In a first drive (DT 2 ¹ » 36 003 P2), the removal elements are each driven by a pair of lever arms, each of which is guided with an engagement element in a closed groove curve. The partially overlapping groove curves are located in different planes for the purpose of clearly guiding the lever arms. Because each engagement element is guided on two flanks of the groove curve assigned to it, each engagement element is clearly guided. The groove curves are designed in such a way that one engagement element is torque-effective when the other engagement element is in a dead position. However, such a drive has not been able to prevail in practice.

Another drive for a labeling machine of the type mentioned above (DE 27 09 521 Al) has not been able to prevail in practice. In this drive, two cam disks with external curves are provided in two levels arranged one above the other, each of which is assigned a set of two engagement elements. The four

The engagement elements are offset by 90 degrees from each other on the support element and are arranged at the same radial distance (same lever arm length) from the bearing shaft of the support element. It is not possible to determine from the state of the art whether special precautions have been taken to ensure a compact design of the drive with the best possible loading of the drive at the variously designed stations.

The invention is based on the object of creating a labeling station of the type mentioned at the beginning with a simply designed, compact drive in which the load on the drive is as favorable as possible, taking into account the different angular velocities at the individual stations.

This object is achieved according to the invention in that at least some engagement members have lever arms of different lengths. In this case, some engagement members can, but do not necessarily have to, be offset from one another by an angle other than 90.

In the solution according to the invention, it is advantageous for a favorable distribution of the load on the individual engagement elements, taking into account their different lever arm lengths, if the following engagement alternatives are available:

Either two engagement elements with large lever arms or two engagement elements with small lever arms and one engagement element with a large lever arm are engaged with the curves.

Taking into account the different requirements at the individual stations, the geometrical conditions for the engagement elements should be such that

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be chosen so that the following intervention alternatives arise:

a) On the single roller, two engagement elements with a small lever arm transmit torque and an engagement element with a large lever arm counteracts.

b) On the label box, an engagement element with a large lever arm transmits torque and an engagement element with a large lever arm counteracts it.

c) On the label transfer cylinder, an engagement element with a large lever arm transmits torque and two engagement elements with a small lever arm provide counter-holding.

This solution ensures that, with a compact design of the labeling station, the removal element is not only guided in a defined manner at every point, but above all the load on the elements involved in the drive is as low as possible. If only one engagement element is torque-effective

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Of the engagement elements that produce torque, these are the engagement elements with small lever arms. It is therefore particularly advantageous that two engagement elements with small lever arms produce torque on the glue roller, where the greatest torque must be applied due to the high acceleration required in the rotation of the removal elements.

With regard to minimizing the effective forces, it is also advantageous if the torque-effective engagement element on the label box with a large lever arm is assigned to the curve that is closer to the drive or bearing shaft.

According to a further embodiment, each set of engagement members should comprise an engagement member with a long lever arm and an opposite engagement member with a short lever arm.

Further geometrical features of the invention are that the running circle radius of the bearing shaft is larger than the running circle radius of the drive shaft of the extraction element and that the axes of the drive elements lie within the gear pole path of the cam gear.

The compact design achieved with the invention can be achieved with a gear ratio between the drive shaft and the bearing shaft together with a robust design of the drive according to one embodiment of the invention in that at least one engagement member with a long lever arm with its periphery touches or projects beyond the pitch circle of the gear arranged on the bearing shaft. If, as is known per se, the engagement members consist of rollers mounted on bearing pins, the bearing pins closest to the bearing or drive shaft should be connected in one piece to the carrier element, which carries the gear on a radially recessed shoulder. Even for the engagement members with a long lever arm, a robust connection to the carrier element is achieved with this embodiment.

In the following, the invention is explained in more detail with reference to a drawing showing an embodiment.

In detail:

Fig. 1 a labelling station in schematic representation in plan view,

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Fig. 2 a cam gear of the labeling station

according to Figure 1 in axial section along the line I-I of Figure 1,

Fig. 3 the labeling station according to Figure 1 in

Top view and reduced representation with highlighted outer curves,

Fig. 4 and the labeling station according to Figure 1 in Fig. 5 detail in two rolling phases of a

removal element to a" glue roller in

Top view,

Fig. 6 and the labeling station according to Figure 1 in Fig. 7 detail in two phases of the

Rolling process of a removal element

on a label box

and

Fig. 8 and the labeling machine 9 according to Figure 1 in Fig. 9 detail in two phases of the

Rolling process of a removal element

on the gripper cylinder.

The labeling station shown to scale in the figure consists of a plate-shaped carrier on which four removal elements 2,3,4,5 are arranged at equal angles. Each removal element 2,3,4,5 has a cylindrically curved receiving surface 2',3',4',5' for a label and is mounted between this and its center of curvature in the carrier 1 with a drive shaft 6,7,8,9. When the carrier 1 rotates in the direction of arrow 10, the removal elements 2,3,4,5 inevitably rotate in the same direction in the direction of arrows 11,12,13,14, i.e. in the opposite direction to the carrier 1, by a drive to be described below.

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During this rotation of the carrier 1, the removal elements 2,3,4,5 are moved past the individual stations by executing a rolling movement at various stations, namely a glue roller 15 rotating in the direction of arrow 10, a stationary label box 16 with a stack of labels located therein and a label transfer cylinder (gripper cylinder) 18 rotating in the direction of arrow 17. In this process, the receiving surface 2',3*, 4 ',5' of each removal element 2,3,^,5 is first glued by the glue roller 15 . When rolling on the front label of the label stack located in the label box 16 , the front label is removed from the label stack due to the adhesive effect of the glue on the receiving surface 2', 3', 4', 5' and, upon further rotation of the carrier 1 , is fed to the gripper cylinder 18, which removes it from the receiving surface 2', 3', 4', ⁵ ' and transfers it to objects (not shown here) moving past it, such as bottles.

In order for the receiving surface 2', 3', 4', 5' to roll at the variously designed stations 15, 16, 17, it is necessary that the rotation of each removal element 2, 3, 4, 5 is accelerated and decelerated in the direction of arrow 11, 12, 13, 14. For this purpose, each removal element 2, 3, 4, 5 is connected via a pinion 20, 21, 22 on its drive shaft 6, 7, 8, 9 to a larger gear 23, 24, 25, 26, which is mounted in the carrier 1 behind the associated removal element 2, 3, 4, 5 in the direction of rotation by means of a bearing shaft not shown in Figure 1.

The larger gear 23,24,25,26 is part of a cam mechanism. Each of these cam mechanisms has the same structure, so that the description below can be restricted to the cam mechanism associated with the removal element 2, shown in detail in Figure 2.

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A carrier element 24 is fixedly mounted on the lower end of the bearing shaft mounted in the carrier. The carrier element consists of an outer body 24a and an inner body 24b. The outer body 24a points inwards
The inner body 2.4b has claws directed inwards and the inner body 2.4b has claws directed outwards, lying between the claws directed inwards. Between the two bodies and also between the interlocking claws an insert 24c made of rubber-elastic material is arranged. A d%.!»-like support element is the subject of the older
German patent application P 38 11 868.

The outer body 24a carries on a radial
The larger gear 23 is located on the upper shoulder, which is set back and consists of two gears that can be rotated against each other to eliminate play and are fixed to the outer body 24a by means of non-
shown screw bolt lockable gears 23a,23b.

At the bottom of the not recessed
Support element 24 are two opposite
The engagement members 25, 26 are made up of a bearing pin 26a, 27a and a roller 26b, 27b mounted rotatably on it. The bearing pins 26a, 27a are connected in one piece to the non-recessed lower part of the carrier element. As can be seen from Figure 2 and also from Figure 1, the roller 26b projects with its outer periphery beyond the pitch circle of the gear wheel 23, 23a, 23b. With this geometry, a robust design in two-part construction, in which the associated bearing pin 26a would have to be accommodated in a hole in the carrier element, would not be possible.

The bearing pins 26a, 27a carry on their underside a bridge member 30 in the form of a ring, on the lower side of which two opposite and to the engagement members

26,27 offset engagement members 28,29, which also consist of a bearing pin 28a and a roller 28b arranged thereon, are attached. The engagement members 26-28 are, as shown in Figure 1, at an angle to each other

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which is between 70 and 110 and is not equal to 90. In addition, the engagement members 25-28 have a different radial distance from the axis of the bearing shaft 25, and therefore engage with different lever arm lengths. In each plane there is one engagement member with a long lever arm and one engagement member with a short lever arm. The two sets of engagement members ^2c -29 are assigned a double cam disk 31 with two outer curves 32,33. This double cam disk 31 is rigidly connected to the machine frame 35 of the labeling station via a support bridge 36. The outer curves 32,33 have the basic shape of ovals with indentations on some of their long sides and are arranged crosswise to one another.

As shown in Figure 1 and indicated in dash-dotted lines in Figure 2, the outer curves 32, 33 are located in sections in the area of the axis of the bearing shaft 25. However, since the construction with the bridge member 30 located between the outer curves 32, 33 has created a wave-free space 36 in the area of the outer curve 32 in the middle between the engagement members 26, 27 and the drive or bearing shaft 25 did not need to be pulled through in the area of the lower outer curve 33 anyway, the outer curves 32, 33 can be optimally designed over their entire length and the entire drive can be made compact with little outlay on components. At each point on the outer curves 32, 33, at least one engagement member is effective in transmitting torque and at least one engagement member is effective in supporting, so that a defined rotational position for the removal element is always achieved.

Figure 3 shows an example of a cam mechanism.

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stationary locking pole curve 36 and the associated movable gear pole curve 37 are shown. Locking pole curve 36 and gear pole curve 37 represent curves that roll over each other in a point-like manner and follow the same law of motion as the cam gear realized with the two outer curves 32, 33 and the associated engagement elements 26-29. From this !>?· &igr;&oacgr; division it can be seen that the axes of all engagement elements 26-29 lie inside and their periphery outside the movable gear pole curve 37. From Figure 3 it can also be seen that the running circle R of the bearing shaft 25 lies inside the running circle R of the drive shaft

A 6 of the extraction element. This geometry also contributes

contributes to the compact design.

Figures 1 and 5 show the engagement of the engagement members on the glue roller. At the beginning of the rolling process, the two engagement members 27»28 are torque-effective and the engagement member 26 with a long lever arm is engaged in a counter-holding manner. In this initial phase, which is particularly important for the glueing process, optimal guidance is achieved through the double engagement of the two engagement members with a short lever arm and the counter-holding engagement member with a long lever arm. As the rolling process continues, when the requirements for the guidance of the removal element are no longer so high, the engagement of the fine engagement member with a short lever arm is lost. This moment is shown in Figure 5.

In the area of the label box, the two engagement members 26, 29 with a large lever arm are engaged, as shown in Figures 6 and 7. From the beginning of the rolling process to at least the middle, the engagement member 26 closest to the bearing shaft is torque-effective, while the engagement member 29 is counter-holding. The proximity of the engagement member 26 with a long lever arm to the bearing cell also results in very precise guidance.

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Since the guidance of the removal element 2 is the least critical of all stations 15, 16, 17 on the gripper cylinder 18, the engagement element 29 with a long lever arm that is the one with the greatest distance from the bearing shaft 25 is the one that has the greatest torque effect at the start of the rolling process. This guidance, which is not as optimal as the torque-effective engagement elements at the other stations, is nevertheless completely sufficient. In this case, the two engagement elements 27 128 with a short lever arm act as a counter-hold.

Claims (8)

02.11.1990 KN/HW 49052G CLAIMS 1. Labelling station for objects, in particular bottles, with several stations arranged one behind the other along a track, namely a gluing roller (15), a label box (16) and a label transfer cylinder (18) and with at least one removal element (2,3,4,5) for the labels which is rotatably mounted on a rotating carrier (1) and moves past the stations (15,16,18) at different angular speeds with each revolution of the carrier (1), each of which has an outwardly curved receiving surface ( ^21,3 ',4',5') for the label which rolls along the stations (15,16,18), wherein a cam gear is provided as the drive for each removal element (2,3,4,5), which consists of a stationary double cam disk (31) common to all removal elements (2,3,4,5) with one-sided Outer curves (32,33) and two sets of two engagement members (26,27,28,29) each, which are mounted at an angle to one another on the drive shaft (6,7,8,9) or a bearing shaft (25) coupled to it by means of a carrier element (24) and, by means of a form connection with the two curves (32,33), ensure the forced running of each removal element (2,3»4,5) over its full rotation when the carrier (1) rotates, the axes of all engagement members (26,27,28,29) lying within the gear pole curve (37) of the cam gear and at least one engagement member (26,29), in particular 4 2 all engagement members (26,27,28,29) are partially located outside the gear pole curve (37), characterized in that at least some engagement members (26,27,28,29) have lever arms of different lengths. 2. Labeling station according to claim 1, characterized in that at least some engagement members (26, 27, 28, 29) &ogr; offset from each other by an anglee&unequal to 90 are. 3. Labeling station according to claim 1 or 2, characterized by the following engagement alternatives of the engagement members (26, 27, 28, 29): Either two engagement members (26,29) with large lever arms or two engagement members (27,28) with small lever arms and one engagement member (26,29) with large lever arm are in engagement with the curves (32,33). 4. Labeling station according to claim 3» characterized by the following intervention alternatives: a) On the glue roller (15) there are two engagement elements (27,28) with small lever arms torque-transmitting and an engagement member (26) with a large lever arm acts as a counter-holding element. b) On the label box (16), an engagement member (26) with a large lever arm transmits torque and an engagement member (29) with a large lever arm acts as a counter-hold. I t • * I e · c) On the label transfer cylinder (18), an engagement member (29) with a large lever arm transmits torque and two engagement members (27, 28) with small lever arms act to counteract it. 5· Labeling station according to one of claims 1 to 4, characterized in that the torque-effective gripping member (26) on the label box (16) is assigned to the curve (32) closer to the drive or bearing shaft (25). 6. Labeling device according to one of claims 1 to 5, characterized in that each set of engagement members (26-29) comprises an engagement member (26, 29) with a long lever arm and an opposite engagement member (27, 28) with a short lever arm. 7. Labeling station according to one of claims 1 to 6, characterized in that the running circle (R ) of the drive shaft (6) of the removal element (2) is larger than the running circle (R ) the bearing shaft (25) of the removal element (2). 8. Labeling station according to one of claims 1 to 7, characterized in that in a gear transmission mechanism (19-26) located between the drive shaft (6) and the bearing shaft (25), at least one engagement member (26) with a long lever arm is tangent to or projects beyond the pitch circle of the gear (23, 23a, 23b) arranged on the bearing shaft (25). 9· Labeling station according to claim 8, characterized in that the engagement members (26, 27) consist of bearing pins (26a, 27a) mounted rollers (26b,27b), wherein the bearing journals (26a,27a) closest to the bearing shaft (25) are connected in one piece to the carrier element (24), since the gear wheel (23,23a,23b) is supported on a radially recessed shoulder.