BLASETIKETTIERER

Description

[0001] The invention relates to a blown labeller for applying labels to packaging.

[0002] Labeling machines are used in price marking systems for variable-weight price and product labeling in retail, trade, and industrial settings. During transport, the weight of the packaging is determined by a load cell on which the conveyor belt rests. The labeling machine then prints a corresponding label with the weight and price and affixes the label to the packaging.

[0003] With a stamp labeler, the labels are mechanically stamped onto the packaging using a stamping head. Depending on the design, this can damage the packaging. In contrast, with a blow labeler, the labels are blown onto the packaging without contact, thus preventing damage. Furthermore, a blow labeler can also label uneven packaging.

[0004] Document DE 10 2015 106 647 A1 discloses a blow-applied labeling machine with a blow-off head that has a label application surface interspersed with suction and blow-off openings. The labels are held on the application surface by suction and blown off by compressed air. The machine allows the labels to be rotated before being applied to the packaging so that they can be aligned relative to the packaging in the direction of rotation. For this purpose, part of the application surface is designed as an annular area with suction openings. To rotate a label held on the application surface, the annular area with the label attached to it is extended from the rest of the application surface, rotated, and then retracted before the label, in its new position due to the rotation, is blown off towards the respective packaging.However, extending and retracting the ring-shaped area takes time and thus limits the throughput of the blow labeler.

[0005] A blow-applied labeler with the features of the preamble of claim 1 is known from document WO 2020 / 116575 A1. Document US 10,407,201 B1 discloses a blow-applied labeler with a base platform and a holding platform with a label application surface, wherein the holding platform is configured for blowing off and sucking on labels. Document EP 3 271 254 B1 discloses a blow-applied labeler comprising a base platform with an air connection and a holding platform configured as a blow-off and / or suction nozzle with a label application surface. In both of the latter documents, the holding platform is rotatably mounted on the base platform, wherein the base platform has a drive configured to rotatably drive the holding platform in order to rotate a label held against the label application surface.

[0006] The invention is based on the objective of providing a way to align labels and packaging in the direction of rotation relative to each other, while simultaneously ensuring a high throughput when applying the labels to the packaging.

[0007] This problem is solved by a blow-applied labeler with the features of claim 1, and in particular by a blow-applied labeler for applying labels to packaging, comprising a blow head, a base platform with an air connection device comprising several connections with a compressed air connection and at least one suction air connection, and a holding platform with a label application surface, which is penetrated by a plurality of blow-off openings connected to the compressed air connection and a plurality of suction openings connected to the at least one suction air connection, wherein the holding platform is rotatably mounted on the base platform, wherein the base platform has a drive with an electric motor, and wherein the drive is designed to rotatably drive the holding platform in order to rotate a label held on the label application surface.

[0008] The blow-applying head comprises a base platform and a rotating holding platform with the label application area and the blow-off and intake openings of the blow-applying head. The base platform is equipped with connections for compressed air and suction air for the blow-off and intake openings, as well as an electric motor for rotating the holding platform. In contrast to the blow-applying labeler known from the prior art, the blow-applying labeler according to the invention rotates not just a portion of the label application area with only some of the intake openings, but the entire label application area with all its blow-off and intake openings. This eliminates the need for the additional insertion and retraction of the labels required by the prior art blow-applying labeler, thus enabling a high throughput when applying the labels to the packaging.The wording "with one compressed air connection" does not preclude the possibility that more than one compressed air connection is provided.

[0009] The holding platform can be designed to rotate in both directions. Specifically, it can be rotatable from a starting position in both directions, and / or rotated out of a starting position in one direction and back to the starting position in the opposite direction. Additionally or alternatively, the holding platform can be designed to rotate without limit, meaning that no stop is provided for the rotation, and the holding platform can rotate continuously in at least one of the two directions.

[0010] According to a preferred embodiment, the air connection device features a multi-channel rotary union to provide a sealed connection for compressed and suction air between the base platform and the mounting platform, which is rotatable relative to the base platform. The rotary union allows for the simple and reliable rotatable mounting of the mounting platform on the base platform, while simultaneously ensuring the supply of compressed and suction air to the exhaust and intake ports. Preferably, the number of channels in the rotary union corresponds to the number of ports on the base platform. The rotary union can, in principle, have axial and / or radial interfaces for transferring the compressed and suction air.In particular, the rotary feedthrough can comprise an outer cylinder and an inner cylinder rotatable relative to the outer cylinder by the drive, wherein the holding platform is fixed to the inner cylinder in a rotationally and axially fixed manner.

[0011] Specifically, a number of mutually sealed annular channels corresponding to the number of connections can be formed between the outer cylinder and the inner cylinder. Each annular channel is connected radially to one of the connections via a corresponding opening in the outer cylinder and axially to a corresponding compressed air or suction air channel via a corresponding opening in the inner cylinder. One compressed air channel and at least one suction air channel are provided, running side by side within the inner cylinder and towards the same axial end of the inner cylinder. The other axial end of the inner cylinder can thus be kept free of connections, allowing the drive to engage at this end of the rotary union without obstruction. The phrase "one compressed air channel" does not preclude the possibility of more than one compressed air channel.In principle, the rotary feedthrough can have one or more additional ring channels besides the aforementioned ring channels, to which, however, no connections are assigned or which are not used.

[0012] Preferably, the holding platform comprises a compressed air and suction air duct system that connects the blow-off openings and the intake openings to the rotary feedthrough, in particular to the aforementioned compressed air duct and the aforementioned at least one suction air duct. The compressed air and suction air duct system can be branched multiple times to connect all blow-off openings and all intake openings to the compressed air duct or the at least one suction air duct, respectively.

[0013] Preferably, the holding platform has an air connection port projecting towards the base platform, which forms a common interface between the compressed air and suction air line system and the rotary union. When the inner cylinder rotates, this air connection port is driven along by a counter-shaped coupling section integrally formed at one end of the inner cylinder facing the holding platform. This allows the compressed air and suction air line system of the holding platform and the rotary union of the base platform to be connected mechanically and fluidically in a simple manner. In particular, the coupling section may have a receptacle that engages the air connection port.

[0014] The drive system can comprise a belt drive downstream of the electric motor, with a drive pulley and an output pulley, wherein the rotatable inner cylinder is fixedly connected to the output pulley. The belt drive allows for the simple and maintenance-free transmission of torque from the electric motor to the inner cylinder. Furthermore, it ensures elastic power transmission that dampens shocks and vibrations.

[0015] According to the invention, the label application surface comprises a first application area and a second application area that is linearly displaceable relative to the first application area in the plane of the label application surface, wherein the suction openings are formed at least in the second application area, and wherein the base platform has a further electric motor, which is part of a further drive designed to linearly displace the second application area in order to linearly move a label held on the second application area. The labels to be applied to the packaging can therefore not only be rotated but also linearly displaced before being blown off, so that not only the orientation of the labels on the packaging but also their position can be influenced.

[0016] Furthermore, to facilitate the transfer of labels, the second system area can be moved towards a label feeder of the blow labeler, in particular a printer with a label dispensing edge, in order to simplify or make the transfer of the labels from the label feeder to the blow head more secure.

[0017] In particular, it may be provided that only intake openings are formed in the second system area. The blow-off openings are then exclusively formed in the first system area. Both intake and blow-off openings may be formed in the first system area. It may be provided that the intake openings of the first and second system areas are alternately supplied with suction air, in particular that the labels are transferred from the second system area to the first system area. The blow-off of the labels can take place through the blow-off openings of the first system area.

[0018] Preferably, the intake openings are provided in both the second and the first system area, with the blow labeler being designed to supply only the intake openings of the second system area with suction air when the second system area is moved. Supplying the intake openings of the first system area would be a hindrance during the label movement and is therefore preferably avoided.

[0019] According to a further preferred embodiment, the blow labeler is designed to move the second feed area from a starting position to a transfer position during operation. In the transfer position, it picks up a label, then moves the second feed area with the picked-up label back from the transfer position to the starting position. During this return movement, only the intake openings of the second feed area are supplied with suction air. After the return movement, only the intake openings of the first feed area are supplied with suction air, and then the label is blown off. The second feed area can then be moved back into the transfer position for the next label while the holding platform is still being rotated into the correct orientation for the current label. This further increases the throughput when applying labels to the packaging.

[0020] Preferably, the at least one suction air connection comprises a first suction air connection and a second suction air connection, wherein the intake openings of the first holding area are in fluid communication with the first suction air connection and the intake openings of the second holding area are in fluid communication with the second suction air connection. This makes it easy to supply the first and second holding areas with suction air separately, and in particular alternately.

[0021] The first and second application areas can each be formed by several application strips, all oriented in the same direction, with the application strips of the first and second application areas arranged alternately side by side. This allows both the first and second application areas to apply suction air over the largest possible area of ​​a label held against the label application surface. This is particularly advantageous for alternating application. Specifically, the application strips of the second application area can be shorter than those of the first. In the aforementioned transfer position, the application strips of the second application area can be flush with the application strips of the first application area.

[0022] According to a further preferred embodiment, the holding platform comprises a base body with the first contact area and a slide assembly with the second contact area, wherein the slide assembly can be linearly driven via a drive shaft rotatably mounted on the base body, which is part of the further drive system. This allows the second contact area to be moved in a simple and reliable manner. The base body can include two retaining brackets projecting towards the base platform, against which the slide assembly is supported.

[0023] The slide arrangement can comprise two slides that are parallel and slidable relative to each other, with each slide carrying one of two parts of the second support area. The two slides can be arranged on opposite sides of the aforementioned rotary feedthrough, thereby achieving a certain symmetry that allows for balanced rotation of the holding platform as well as balanced movement of the second support area.

[0024] The holding platform can comprise two threaded spindles, with each of the two slides designed as a spindle nut and threaded onto one of the two threaded spindles. Rotation of the two threaded spindles causes the two slides to move. This allows for precise movement of the two slides in a simple manner. The holding platform can have at least one guide rod for each slide, along which the respective slide is guided for movement. This ensures that the two slides are held particularly stable during movement. In particular, the guide rods are supported by the two retaining brackets.

[0025] Preferably, the holding platform has a multi-drive belt drive, which is part of the overall drive system, wherein the two threaded spindles are effectively connected to the drive shaft via the multi-drive belt drive. A coupling between the drive shaft on the one hand and the two threaded spindles on the other can be easily achieved by means of a multi-drive belt drive.

[0026] Preferably, the base platform comprises a further belt drive downstream of the second electric motor, with an additional drive pulley and an additional output pulley. This further belt drive is part of the additional drive system, wherein the additional output pulley is mounted on the rotatable inner cylinder, in particular via a ball bearing. The additional belt drive allows for the simple and maintenance-free transmission of torque from the second electric motor. Furthermore, it ensures elastic power transmission that dampens shocks and vibrations.

[0027] Furthermore, it is preferred if the additional drive comprises a bevel gear transmission downstream of the additional belt drive, with a ring gear and a pinion, wherein the ring gear is mounted on the rotatable inner cylinder, in particular by a plain bearing, and is non-rotatably connected to the additional output pulley, and wherein the pinion is rotatably mounted on the base body and non-rotatably connected to the drive shaft. The electric motor and the additional electric motor each have an output shaft which, in particular for a particularly compact design of the blow head, are preferably aligned parallel to each other. With a bevel gear transmission, a rotary motion parallel to the axis of rotation of the holding platform can be easily converted into a rotary motion transverse, in particular perpendicular, to the axis of rotation of the holding platform.This allows the additional electric motor of the second drive to be attached to the base platform and prevents it from moving along with the rotation of the support platform. The weight of the additional electric motor therefore does not contribute to the inertia of the support platform.

[0028] Preferably, the blow-applied labeler is designed to control the additional electric motor in such a way as to compensate for any displacement of the second application area caused by a rotation of the inner cylinder. Depending on the design of the additional drive, a rotation of the holding platform can lead to a displacement of the second application area. This can be counteracted by appropriate counter-control using the additional drive. If it is intended to displace the second application area simultaneously with a rotation of the holding platform, the displacement of the second application area caused by the rotation of the inner cylinder is taken into account when controlling the additional electric motor in order to achieve the desired displacement of the second application area.

[0029] The invention further relates to a price marking system for the automatic weighing and labeling of packages with a blow labeller as described above and a transport device including a weighing belt to weigh the packages and guide them past the blow labeller.

[0030] According to a preferred embodiment, the price marking system comprises a camera arranged in the transport direction in front of the blow labeler to detect the rotational position of the respective package, and a control unit connected to the camera and the blow labeler, which is designed to control the electric motor of the blow labeler drive depending on the detected rotational position of the respective package.

[0031] Typically, packages are guided past the blow labeler in the correct orientation. However, the actual orientation of a package can be rotated by 90° relative to the desired orientation; that is, a package intended to be oriented lengthwise arrives at the blow labeler oriented crosswise, or vice versa. This can be detected by the camera, and the label to be applied to that package can be rotated by 90° accordingly to ensure it is oriented correctly.

[0032] Furthermore, it can happen that individual packages pass the blow labeler misaligned, meaning they are twisted relative to their longitudinal or transverse orientation, especially by a few degrees. Such a twist can also be detected by the camera and compensated for by rotating the label to be applied accordingly, so that the label can be applied to the package with the correct orientation despite the twisted packaging.

[0033] Further advantageous embodiments of the invention are described in the dependent claims, the description of the figures and the drawing.

[0034] The invention is described below by way of example with reference to the drawing. The drawing shows Fig. 1 a perspective front view of a blow head of a blow labeller according to the invention comprising a base platform with a rotary feedthrough and a holding platform with a base body, Fig. 2 a perspective rear view of the blow head made of Fig. 1 , Fig. 3 the blow head made of Fig. 1 In a view from below, Fig. 4, the rotary feedthrough according to Fig. 1 In detail, Fig. 5 the rotary feedthrough made of Fig. 4 In an exploded view, Fig. 6, an inner cylinder of the rotary feedthrough is shown. Fig. 4 from below, and Fig. 7 the holding platform made of Fig. 1 in a perspective view.

[0035] In the Fig. 1 and 2Figure 11 shows a blow head 11 of a blow labeler according to the invention for applying labels to packaging. The blow labeler is part of a price marking system for the automatic weighing and labeling of packaging. In addition to the blow labeler, the price marking system includes a transport device with a weighing belt for weighing the packaging and guiding it past the blow labeler.

[0036] The blow head 11 comprises a base platform 13 and a holding platform 15. The base platform 13 includes an air connection device with a compressed air connection 17 (in Fig. 1 left center) and a first suction air connection 17 (in Fig. 1 top right) and a second suction air connection 17 (in Fig. 1(bottom right). The compressed air connection 17 is connected to a compressed air generator, and the two suction air connections 17 are connected to a suction air generator or vacuum generator, the two suction air connections being independently operable with suction air or vacuum. A label application surface 23 is formed on the underside of the holding platform, on which the labels can first be held by suction air and then blown onto packaging by compressed air. For this purpose, a plurality of blow-off openings 25 connected to the compressed air connection 17 and a plurality of suction openings 27 connected to the two suction air connections 17 are provided in the label application surface 23, as shown in Fig. 3This is evident. All blow-off openings 25 are marked with a reference symbol. For the sake of clarity, however, only some of the intake openings 27 are marked with a reference symbol. The effective area of ​​the intake openings 27 is increased by grooves 95 and circular indentations 97 formed in the label application area 23. No further blow-off or intake openings are provided.

[0037] To enable the labels to be rotated after being transferred from the label feeder of the blown labeler, the holding platform 15 is rotatably mounted on the base platform 13. This allows the labels to be aligned relative to the packaging in the direction of rotation. For this purpose, the base platform 13 has a drive with an electric motor 29. To transfer the compressed air and suction air available at the compressed air connection 17 and at the two suction air connections 17 from the stationary base platform 13 to the rotatable holding platform 15 with the blow-off and suction openings 25, 27, the air connection device has a multi-channel rotary feedthrough 31 (see the Figs. 4 to 6The rotary feedthrough 31 comprises a stationary outer cylinder 33 and a rotatable inner cylinder 35, to the lower end of which the mounting platform 15 is attached. At its upper end, the inner cylinder 35 is coupled to an output pulley 39, which belongs to a toothed belt drive connected downstream of the electric motor 29, the drive pulley 37 of which is driven by the motor shaft of the electric motor 29. The belt of the toothed belt drive is not shown for the sake of better visibility of the other components.

[0038] Between the outer cylinder 33 and the inner cylinder 35, three mutually sealed annular channels 41 are formed. Within the inner cylinder 35, a compressed air channel 45 associated with the compressed air connection 17, a first suction air channel 45 associated with the first suction air connection 17, and a second suction air channel 45 associated with the second suction air connection 17 are formed. The annular channels 41 are each fluidly connected radially to one of the three connections 17 via a corresponding opening 43 formed in the outer cylinder 33, and axially to one of the three channels 45 via a corresponding opening 47 formed in the inner cylinder 35, of which only two are visible. The channels 45 lie side by side and extend towards the lower end of the inner cylinder 35. Due to this design of the rotary feedthrough 31, the holding platform 15 can rotate in both directions and without limitation, i.e., without a stop.

[0039] To connect the blow-off openings 25 with the pressure channel 45 and the intake openings 27 with the two suction air channels 45, the holding platform 15 includes an air connection nozzle 49 projecting towards the base platform 13 (see figure). Fig. 7), which forms a common interface between a compressed air and suction air line system 51 of the holding platform 15 and the rotary feedthrough 31. At its lower end, the inner cylinder 35 has an integrally formed coupling section 53 with a receptacle 55 shaped opposite to the air connection nozzle 49, which engages the air connection nozzle 49 and, when the inner cylinder 35 rotates, engages the air connection nozzle 49, thus rotating the holding platform 15 accordingly. The channels 45 dip into receiving openings 89 formed in the air connection nozzle 49, from which the compressed air and suction air line system 51 extends to the blow-off and intake openings 25, 27. The compressed air and suction air piping system 51 is designed such that the lines assigned to the compressed air duct 45, the lines assigned to the first suction air duct 45 and the lines assigned to the second suction air duct 45 run separately from each other.

[0040] As can be seen from Fig. 3 The label application area 23 is divided into a first application area 57 and a second application area 59, wherein the second application area 59 is linearly displaceable relative to the first application area 57 in the plane of the label application area 23, as explained in more detail below, in order to linearly move a label held by the second application area 59. This allows the position of the labels on the packaging to be adjusted. Furthermore, the labels can be picked up from the label feeder by means of the displaceable second application area 59.

[0041] Both the first setup area 57 and the second setup area 59 of the label setup surface 23 are each formed by several setup strips 61, 63. All setup strips 61, 63 are oriented in the same direction, with the setup strips 61, 63 of the first and second setup areas 57, 59 arranged alternately next to each other. As can be seen from Fig. 3 As can be seen, the installation bars 63 of the second installation area 59 are shorter than the installation bars 61 of the first installation area 57. InThe first system area 57 has both intake openings 27 and exhaust openings 25, while the second system area 59 has only intake openings 27. The intake openings 27 of the first system area 57 are connected to the first suction air connection 17, and the intake openings 27 of the second system area 59 are connected to the second suction air connection 17. Specifically, it is designed that only the intake openings 27 of the second system area 59 are supplied with suction air when the second system area 59 is moved.

[0042] This enables the operation of the blown labeler in which the feed bars 63 of the second feed area 59 from the in Fig. 3The starting position shown is moved to a transfer position (not shown) in which it is flush with the contact strips 61 of the first feed area 57 in order to pick up a label from the label feeder. The contact strips 63 of the second feed area 59 are then moved back to their starting position, with only the intake openings 27 of the second feed area 59 being supplied with suction air during this movement. After the return movement, the second feed area 59 transfers the label to the first feed area 57 by deactivating the intake openings 27 of the second feed area 59 and activating the intake openings 27 of the first feed area 57. The label can then be blown off through the blow-off openings 25 of the first feed area 57.The transfer of the label from the second plant area 59 to the first plant area 57 allows the second plant area 59 to be moved back into the receiving position to pick up the next label, while the holding platform 15 is still being rotated into the correct orientation for the current label.

[0043] To move the second plant area 59, the base platform 13 has an additional drive with another electric motor 65. Downstream of this electric motor 65 is another toothed belt drive with another drive pulley 67 and another output pulley 69, which is mounted on the rotatable inner cylinder 35 via a ball bearing. The belt of this additional toothed belt drive is not shown for the sake of better visibility of the other components, and the additional drive pulley 67 is toothed, contrary to the illustration. Downstream of this additional toothed belt drive is a bevel gear drive with a ring gear 71 and a pinion 73.The ring gear 71 is non-rotatably connected to the further output pulley 69 and is plain-bearing mounted on the rotatable inner cylinder 35, and the pinion 73 and a drive shaft 77 non-rotatably connected to the pinion 73 are each rotatably mounted on a base body 75 of the holding platform 15.

[0044] The first mounting area 57 is formed on the underside of the base body 75. In order to connect the intake openings 27 of the mounting strips 61 of the first mounting area 57 to the compressed air channel 45 and the first suction air channel 45, the compressed air and suction air piping system 51 is partly designed as tubes 19 integrated into the base body 75 of the holding platform 15 and partly as pipe sections 21 arranged on the upper side of the base body 75.

[0045] Furthermore, the base body 75 has two retaining brackets 79 projecting towards the base platform 13, on which a slide assembly is supported and driven by the drive shaft 77, the second contact area 59 being formed on the underside of the slide assembly. The slide assembly is formed by two slides 81 that are slidable parallel and in the same direction relative to each other. Each of the two slides 81 carries two of the contact strips 63 of the second contact area 59.

[0046] The two slides 81 are each designed as a spindle nut and are each threaded onto a threaded spindle 83. The two threaded spindles 83 are driven by the drive shaft 77 via a multi-drive belt transmission 85. Rotation of the two threaded spindles 83 causes a displacement of the two slides 81 and thus of the second contact area 59. The two slides 81 are guided along two guide rods 87, which are supported by the two retaining brackets 79.

[0047] In order to connect the intake openings 27 of the mounting strips 63 of the slides 81 to the second suction air duct 45 or the second suction air connection 17, the compressed air and suction air duct system 51 has an outlet 91 extending laterally from the air connection nozzle 49, which is connected via a T-shaped branched pipe hose (not shown) to a respective inlet 93 of the two slides 81.

[0048] Since the pinion 73 moves relative to the ring gear 71 when the holding platform 15 rotates, the second contact area 59 would also automatically shift when the holding platform 15 rotates. This is prevented by controlling the additional electric motor 65 in such a way that any shift of the second contact area 59 caused by a rotation of the inner cylinder 35 is compensated for. If the holding platform 15 is to be rotated and the second contact area 59 shifted simultaneously, this is taken into account accordingly. Reference symbol list

[0049] 11 Blow head 13 Base platform 15 Holding platform 17 Compressed air or suction air connection 19 Tube 21 Pipe section 23 Label application surface 25 Blow-off opening 27 Intake opening 29 Electric motor 31 Rotary feedthrough 33 Outer cylinder 35 Inner cylinder 37 Drive pulley 39 Output pulley 41 Ring channel 43 Opening 45 Compressed air or suction air channel 47 Opening 49 Air connection nozzle 51 Compressed air and suction air duct system 53 Coupling section 55 Mount 57 First contact area 59 Second contact area 61 Contact strip 63 Contact strip 65 Additional electric motor 67 Additional drive pulley 69 Additional output pulley 71 Ring gear 73 Pinion 75 Base body 77 Drive shaft 79 Retaining bracket 81 Slide 83 Threaded spindle 85 Multi-drive belt drive 87 Guide rod 89 Mounting opening 91 Outlet 93 Inlet 95 Groove 97 Recess

Claims

1. A blow-on labeler for applying labels to packages, comprising a blow head (11) having a base platform (13), which has an air connection device that comprises a plurality of ports (17) having a compressed air port (17) and at least one suction air port (17), and a holding platform (15) having a label contact surface (23) which is perforated by a plurality of blow-off openings (25) in fluid communication with the compressed air port (17) and a plurality of suction openings (27) in fluid communication with the at least one suction air port (17), wherein the holding platform (15) is rotatably supported at the base platform (13), wherein the base platform (13) has a drive having an electric motor (29), and wherein the drive is configured to rotatably drive the holding platform (15) in order to rotate a label held at the label contact surface (23), characterized in that the label contact surface (23) comprises a first contact region (57) and a second contact region (59) which is linearly displaceable relative to the first contact region (57) in the plane of the label contact surface (23), with the suction openings (27) being formed at least in the second contact region (59), and with the base platform (13) having a further electric motor (65) that is part of a further drive which is configured to drive the second contact region (59) in a linearly displaceable manner in order to linearly move a label held at the second contact region (59).

2. A blow-on labeler according to claim 1, characterized in that the holding platform (15) is rotatable in both directions of rotation and / or is rotatable without limitation.

3. A blow-on labeler according to claim 1 or 2, characterized in that the air connection device has a multi-channel rotary union (31) to realize a sealed passage for the compressed air and the suction air between the base platform (13) and the holding platform (15) which is rotatable relative to the base platform (13), wherein it is in particular provided that the rotary union (31) comprises an outer cylinder (33) and an inner cylinder (35) which can be rotated relative to the outer cylinder (33) by the drive, wherein the holding platform (15) is held at the inner cylinder (35) in a rotationally and axially fixed manner.

4. A blow-on labeler according to claim 3, characterized in that, between the outer cylinder (33) and the inner cylinder (35), a number of annular channels (41) sealed from one another corresponding to the number of ports (17) is formed, with one of the ports (17) being connected to each annular channel (41) in the radial direction via an associated opening (43) in the outer cylinder (33) and an associated compressed air or suction air channel (45) being connected to each annular channel (41) in the axial direction via an associated opening (47) in the inner cylinder (35), with a compressed air channel (45) and at least one suction air channel (45) being provided that run side by side within the inner cylinder (35) and toward the same axial end of the inner cylinder (35).

5. A blow-on labeler according to claim 3 or 4, characterized in that the holding platform (15) comprises a compressed air and suction air line system (51) which connects the blow-off openings (25) and the suction openings (27) to the rotary union (31), in particular to the compressed air channel (45) and the at least one suction air channel (45).

6. A blow-on labeler according to claim 5, characterized in that the holding platform (15) has an air connection nozzle (49) which projects toward the base platform (13), which forms a common interface of the compressed air and suction air line system (51) to the rotary union (31) and which, upon a rotation of the inner cylinder (35), is taken along by a complementarily shaped coupling section (53) which is molded to an end of the inner cylinder (35) facing the holding platform (15), wherein it is particular provided that the coupling section (53) has a receptacle (55) which engages over the air connection nozzle (49).

7. A blow-on labeler according to any one of the claims 3 to 6, characterized in that the drive comprises a belt drive connected downstream of the electric motor (29) and having a drive pulley (37) and a driven pulley (39), with the rotatable inner cylinder (35) being connected in a rotationally fixed manner to the driven pulley (39).

8. A blow-on labeler according to any one of the claims 3 to 7, characterized in that the base platform (13) comprises a further belt drive connected downstream of the further electric motor (65) and having a further drive pulley (67) and a further driven pulley (69), which further belt drive is part of the further drive, with the further driven pulley (69) being supported on the rotatable inner cylinder (35), in particular via a ball bearing.

9. A blow-on labeler according to any one of the preceding claims, characterized in that only suction openings (27) are formed in the second contact region (59) and / or both suction openings (27) and blow-off openings (25) are formed in the first contact region (57).

10. A blow-on labeler according to any one of the preceding claims, characterized in that the suction openings (27) are formed both in the second contact region (59) and in the first contact region (57), with the blow-on labeler being configured to supply only the suction openings (27) of the second contact region (59) with suction air upon a displacement of the second contact region (59).

11. A blow-on labeler according to any one of the preceding claims, characterized in that the blow-on labeler is configured to displace the second contact region (59) from a starting position into a takeover position during operation in order to take over a label in the takeover position, to displace the second contact region (59) with the taken-over label from the takeover position back into the starting position, with, upon the displacement back, only the suction openings (27) of the second contact region (59) being supplied with suction air, and, after the displacement back, to supply only the suction openings (27) of the first contact region (57) with suction air and, subsequently, to blow off the label.

12. A blow-on labeler according to any one of the preceding claims, characterized in that the at least one suction air port (17) comprises a first suction air port (17) and a second suction air port (17), with the suction openings (27) of the first contact region (57) being in fluid communication with the first suction air port (17) and the suction openings (27) of the second contact region (59) being in fluid communication with the second suction air port (17).

13. A blow-on labeler according to any one of the preceding claims, characterized in that the first contact region (57) and the second contact region (59) are each formed by a plurality of contact strips (61, 63) which are all oriented in the same direction, with the contact strips (61) of the first contact region (57) and the contact strips (63) of the second contact region (59) being arranged alternately side by side, wherein it is in particular provided that the contact strips (63) of the second contact region (59) are shorter than the contact strips (61) of the first contact region (57).

14. A blow-on labeler according to any one of the preceding claims, characterized in that the holding platform (15) comprises a base body (75) having the first contact region (57) and a carriage assembly having the second contact region (59), with the carriage assembly being linearly drivable via a drive shaft (77) which is rotatably supported at the base body (75) and which is part of the further drive, wherein it is in particular provided that the base body (75) comprises two retaining brackets (79) which project toward the base platform (13) and at which the carriage assembly is supported.

15. A blow-on labeler according to claim 14, characterized in that the carriage assembly comprises two carriages (81) which are displaceable parallel to and in unison with one another, with each carriage (81) carrying one of two parts (63) of the second contact region (59).

16. A blow-on labeler according to claim 15, characterized in that the holding platform (15) comprises two threaded spindles (83), with the two carriages (81) each being formed as a spindle nut and each being threaded onto one of the two threaded spindles (83), with a rotation of the two threaded spindles (83) causing a displacement of the two carriages (81).

17. A blow-on labeler according to claim 15 or 16, characterized in that the holding platform (15) comprises, for each carriage (81), at least one guide rod (87) which is in particular supported at the two retaining brackets (79) and along which the respective carriage (81) is guided in a displaceable manner.

18. A blow-on labeler according to claim 16 or 17, characterized in that the holding platform (15) has a multiple-drive belt transmission (85) which is part of the further drive, with the two threaded spindles (83) being drive-effectively connected to the drive shaft (77) via the multiple-drive belt transmission (85).

19. A blow-on labeler according to any one of the claims 14 to 18 and claim 8, characterized in that the further drive comprises a bevel gear transmission connected downstream of the further belt drive and having a ring gear (71) and a pinion (73), with the ring gear (71) being supported, in particular sliding supported, on the rotatable inner cylinder (35) and being connected in a rotationally fixed manner to the further driven pulley (69), and with the pinion (73) being rotatably supported at the base body (75) and being connected in a rotationally fixed manner to the drive shaft (77).

20. A blow-on labeler according to any one of the preceding claims, characterized in that the blow-on labeler is configured to control the further electric motor (65) in such a way that a displacement of the second contact region (59) caused by a rotation of the inner cylinder (35) is compensated for.

21. A price labeling system for the automatic weighing and labeling of packages comprising a blow-on labeler according to any one of the preceding claims and a transport device including a weighing belt to weigh the packages and to guide them past the blow-on labeler.

22. A price labeling system according to claim 21, characterized in that the price labeling system comprises a camera arranged in the transport direction in front of the blow-on labeler to detect the rotational position of the respective package, and a control unit which is connected to the camera and the blow-on labeler and which is configured to control the electric motor (29) of the drive of the blow-on labeler in dependence on the detected rotational position of the respective package.