DE102020207415A1 - Device for separating printing plates - Google Patents

Abstract

A device for separating printing plates (8) comprises a detection element (23) with suction elements (30) for removing the printing plates (8) from a plate stack (53) and an air blowing element (54) for blowing air onto the plate stack (53). The air blowing element (54) is coupled to a button (55) for feeling the uppermost pressure plate (8) of the plate stack (53) and is thereby adjusted to a decreasing height (H) of the plate stack (53).

Description

The present invention relates to a device for separating printing plates, comprising a detection element with suction elements for removing the printing plates from a stack and an air blowing element for blowing air onto the stack of plates.

In DE 101 04 078 A1 describes a device for separating printing plates. The air blowing element of this device has a blowing slot which extends over the entire height of the stack. The device is provided in particular for separating printing plates that have not yet been exposed and are to be fed to a platesetter. What is unfavorable about this device is that as the stack height decreases in the course of the separation, the exposed slot length not covered by the plate edges increases and thus the proportion of false air also increases. The efficiency and reliability suffer as a result.

The object of the invention is to create a separating device that works reliably and with a high degree of efficiency.

This object is achieved by a device for separating printing plates, comprising a sensing element with suction elements for removing the printing plates from a stack of plates and an air blowing element for blowing air onto the stack of plates, characterized in that the air blowing element is equipped with a button to feel the top printing plate of the Plate stack is coupled and is thereby tracked to a decreasing height of the plate stack.

An advantage of the device according to the invention is that the blown air element is always optimally aligned when working and false air is avoided. This ensures a high degree of efficiency and great reliability.

An additional advantage is the good suitability for separating already exposed printing plates that are to be fed to the printing units of a printing press. In practice, such illustrated printing plates are usually coated with preservatives to protect them. The preservative is sticky, which is why, as an unavoidable side effect, these printing plates adhere particularly tightly to one another in the stack.

• Der Taster und/oder das Luftblasorgan kann verschiebbar und/oder schwenkbar sein. Die Koppelung kann so beschaffen sein, dass eine Verschiebung des Tasters eine Verschiebung und/oder eine Schwenkbewegung des Luftblasorgans bewirkt und/oder dass eine Schwenkbewegung des Tasters eine Verschiebung und/oder eine Schwenkbewegung des Luftblasorgans bewirkt. Bevorzugt wird die Variante, bei der eine Schwenkbewegung des Tasters eine Schwenkbewegung des Luftblasorgans bewirkt. Die Koppelung des Luftblasorgans mit dem Taster kann elektronisch und/oder mechanisch realisiert sein. Bei der elektronischen Koppelung kann der Taster ein kontaktlos arbeitender Sensor sein, z. B. ein Abstandssensor. Bei der mechanischen Koppelung ertastet der Taster die oberste Druckplatte unter Kontakt mit dieser. Es kann ein das Luftblasorgan mit dem Taster koppelndes Getriebe vorhanden sein, z. B. ein Schraubengetriebe oder ein Koppelgetriebe. Beispielsweise kann eine elektro-mechanischen Koppelung vorgesehen sein, bei der zur Nachführung das Luftblasorgan über ein Schraubengetriebe verschoben wird, das von einem Elektromotor angetrieben wird, der in Abhängigkeit von Signalen eines Abstandsensors angesteuert wird.

The further developments of the invention described below can be implemented individually or - if they are not technically mutually exclusive - in any combination with one another:

• The button and / or the air blowing element can be displaceable and / or pivotable. The coupling can be such that a displacement of the button causes a displacement and / or a pivoting movement of the air blowing element and / or that a pivoting movement of the button effects a displacement and / or a swiveling movement of the air blowing element. The variant in which a pivoting movement of the pushbutton causes a pivoting movement of the air blowing element is preferred. The coupling of the air blowing element with the button can be implemented electronically and / or mechanically. With electronic coupling, the button can be a contactless sensor, e.g. B. a distance sensor. With the mechanical coupling, the button feels the top pressure plate in contact with it. There may be a transmission coupling the air blowing element with the button, e.g. B. a helical gear or a coupling gear. For example, an electro-mechanical coupling can be provided in which, for tracking, the air blowing element is displaced via a helical gear that is driven by an electric motor that is controlled as a function of signals from a distance sensor.

It is particularly advantageous if a coupling gear is available for pivoting the button.
The coupling mechanism can be a four-bar mechanism with a first rocker arm, a second rocker arm and a coupling mechanism.
The button can be arranged on the coupling, for. B. molded or attached to it.
The air blowing element can be attached to the first rocker and rotate together with the first rocker.
The first rocker can be mounted in a frame or a plate via a first swivel joint, and a geometric axis of rotation of the air blowing element can be arranged coaxially with the first swivel joint.
The second rocker can be connected to the frame or the plate via a second swivel joint.
An actuator, e.g. B. a pneumatic or hydraulic working cylinder or another linear drive can attack the first rocker.
The first rocker can have a first arm and a second arm. The first arm can be articulated to the coupling and / or the actuator can act on the second arm. The actuator can act either directly or indirectly via an intermediate gear on the second arm. If the actuator is designed as a working cylinder, it can act directly on the second arm with its piston rod. If the actuator is designed as an electric motor, it can act indirectly on the second arm via a helical gear.
The air blowing element can only have a single blowing nozzle, but preferably has at least two blowing nozzles or a row of blowing nozzles.
The air blowing device can be a blow pipe.
It is preferred that the air blowing element is a blowing tube and that it has at least two blowing nozzles along the blowing tube.

The device can have several air blowing organs. For example, a first air blowing element can be arranged close to one side edge of the plate stack and a second air blowing element close to the other side edge, both air blowing elements being coupled to a common button or being coupled to a separate button each.

The detection element can be a swivel arm.
The suction elements can be lifting suction devices.
The separating device can be used in a plate handling device which has a first pallet carrier and a second pallet carrier, but also in a plate handling device with only a single pallet carrier.

Further developments, which can be implemented individually or - insofar as they are not technically mutually exclusive - in any combination with one another or with the developments already mentioned above, result from the following description of an exemplary embodiment and the associated drawing.

• 1 eine Vorrichtung zum Handhaben von Druckplatten an einer Druckmaschine in Seitenansicht,
• 2 die Vorrichtung aus 1 in Draufsicht,
• 3 eine zur Handhabungsvorrichtung aus den 1 und 2 gehörende Vorrichtung zur Vereinzelung von Druckplatten als Ausschnitt in Seitenansicht,
• 4 die Vereinzelungsvorrichtung aus 3 in vergrößerter Draufsicht,
• 5 die Vereinzelungsvorrichtung aus 3 beim Abheben einer Druckplatte von einem Plattenstapel und
• 6 eine Detaildarstellung der Vereinzelungsvorrichtung aus 3, vergrößert und ohne Plattenstapel dargestellt, mit zur 3 entgegengesetzter Blickrichtung.

It shows:

• 1 a device for handling printing plates on a printing machine in a side view,
• 2 the device off 1 in plan view,
• 3 one to the handling device from the 1 and 2 associated device for separating printing plates as a cutout in side view,
• 4th the separating device off 3 in an enlarged plan view,
• 5 the separating device off 3 when lifting a printing plate from a stack of plates and
• 6th a detailed representation of the separating device 3 , enlarged and shown without a stack of plates, with for 3 opposite viewing direction.

A printing press 1 includes printing units arranged in a row 2 , 3 for offset printing on sheets in a feeder 4th a stack 5 form. Every printing unit 2 , 3 is with a record changer 6th , 7th for printing plates 8th equipped with a shaft 9 for fresh printing plates 8th - so-called new panels - and a shaft 10 for used printing plates 8th - so-called old panels - has. The printing press 1 is combined with a plate logistics system that controls the printing plates 8th to the record changers 6th , 7th and promotes it back after use. The operator removes a pallet 12th with the printing plates 8th therein from a floor conveyor 11 and hands over the pallet 12th to a pallet lift 13th .

The orthogonal coordinate system in the drawing includes the vertical direction z and horizontal directions x , y , where x is the longitudinal direction and y is the transverse direction of the printing machine 1 is equivalent to.

The pallet lift 13th is towards x in front of the jetty 4th arranged and transported the pallet 12th along the directions z and y to a charging station 14th that are above the pile 5 and a suction head 15th of the investor 4th is arranged. The charging station 14th serves to unload the new panels from the pallet 12th and loading with old panels and has a first pallet carrier 16 and second pallet carrier 17th on that towards y are arranged one behind the other. The pallet lift 13th has a third pallet carrier 18th on. The first pallet carrier 16 and the second pallet carrier 17th are via several coupling gears 19th on a sled 20th attached by a rail 21 led towards y is adjustable.

With the linkage 19th actuators are connected 22nd through which the first and second pallet carriers 16 , 17th relative to the third pallet carrier 18th be swiveled. The third pallet carrier reaches through 18th that pallet carrier 16 or 17th that was previously along the rail 21 in one direction x aligned opposite with the third pallet carrier 18th has been proceeded. With this reaching through, the third pallet carrier hands over or takes over 18th the pallet to or from the other pallet carrier 16 or 17th .

One to the charging station 14th belonging swivel arm 23 with a transport side 25th for the printing plates 8th is around one direction y running axis 24 pivotable at its lower end. The swivel arm 23 captures the printing plates as they are separated and can therefore also be used as a capturing element 23 are designated. The swivel arm 23 becomes from his re 1 left end position (drawn with full line) to its right end position (drawn with phantom line) and swiveled back again, and each time folded beyond its vertical alignment. In the right end position, the transport side rises 25th obliquely to the top right and it extends parallel to the first pallet carrier 16 or second pallet carrier 17th and the respective pallet 12th or. 26th in this. In the left end position the increases Transport side 25th obliquely to the top left and it extends parallel or flush with a transport strand of a first conveyor belt 27 of a belt conveyor 28 standing over a sheet feed table 29 of the investor 4th is arranged.

The swivel arm 23 has lifting suction cups 30th that came from the transport side 25th extend and the top pressure plate 8th the stack of panels on the pallet 12th to take. The lifting suction cups 30th can also be used generally as suction elements 30th are designated. The swivel arm 23 swivels with that of the lifting suction cups 30th suctioned pressure plate 8th from the right to the left end position, where the lifting suction cups 30th in the swivel arm 23 retract again to the gripped pressure plate 8th on the first conveyor belt 27 to discard. Then the working cycle of the swivel arm is repeated 23 which the printing plates 8th one at a time from the range 12th removes and on the belt conveyor 28 drops.

The belt conveyor 28 includes a second conveyor belt 31 , which by an actuator 52 around a geometric axis 32 in a first operating position (drawn with a solid line) and a second operating position (drawn with a phantom line) is alternately pivoted. The second conveyor belt 31 is vertically aligned in the first operating position and forms a common conveying level in the second operating position 33 with the first conveyor belt 27 . The two conveyor belts 27 , 31 each consist of several endless belts that are the same length and run parallel to each other around pulleys. Along the axis 32 are pulleys, over which the endless belts of the first conveyor belt 27 run, arranged alternately with pulleys, over which the endless belts of the second conveyor belt 31 to run. In other words: the endless belts of the first conveyor belt 27 run in a gap between the endless belts of the second conveyor belt 31 .

The swivel arm 23 has a direction y running row of prongs that match the gaps between the endless belts of the first conveyor belt 27 align and with these gaps in the left end position of the swivel arm 23 comb.

The first and second conveyor belt 27 , 31 are designed as suction belts on which the printing plate 8th is held in place by vacuum during transport, and each comprise a vacuum box. The vacuum box sucks the printing plate through the gaps between the endless belts or perforations in the endless belts 8th so that it is held pneumatically on the endless belts.

The belt conveyor 28 transfers the new panels to a panel conveyor 34 , the one above the printing units 2 , 3 is arranged, and later takes over from the plate conveyor 34 the old records. The plate conveyor 34 includes wagons 35 , their number that of those with the printing plates 8th printing units to be supplied 2 , 3 is equivalent to. The wagons 35 are on an endless traction mechanism 36 attached or engaged with this, especially a toothed belt, and are jointly via the traction mechanism 36 from a drive wheel 37 driven. The traction device 36 runs from the loading station when the new panels are conveyed 14th to the printing units 6th , 7th with reference to 1 clockwise around and when conveying the old plates from the printing units 2 , 3 to the charging station 14th counter clockwise. One with the drive wheel 37 Electric motor connected as a direct drive is reversed accordingly in order to change the direction of the traction mechanism 36 to effect.

A rail system 38 for driving the car 35 includes an upper rail piece 39 and a lower rail piece, which is passed through a horizontal rail 40 that is formed towards x runs. The entire rail system 38 has an oval or elongated ring shape along which the carriages 35 circulate. To form the ring shape, the upper and lower rail pieces, which are straight and run parallel to one another, are connected to one another at their ends by curved rail pieces.

To the car 35 are self-supporting beams 41 with grippers 42 for holding the printing plates by clamping 8th arranged. The bars 41 extend towards y along its length, taking towards y every bar 41 at least as long as the pressure plate 8th is wide. The number of in series on a wave 49 arranged gripper 42 per bar 41 is two in the example and can also be three. With their synchronized transport along the horizontal rail 40 hang the printing plates 8th perpendicular to the beam 41 .

On a plate 43 are control cams 44 to operate the gripper 42 who have favourited cars 35 with the bars 41 , the rail system 38 for driving the car 35 and the traction device 36 to drive the car 35 arranged. The plate 43 is of stand 45 worn, each of which is a different printing unit 2 , 3 is assigned. The stand 45 can be used as telescopic rail guides 50 be trained. Any stand 45 forms a vertical rail 46 for guiding the plate 43 or has one. Along the vertical rails 46 becomes the plate 43 together with the said elements arranged thereon by one or more actuators (not shown in the drawing) in the uprights 45 adjusted up and down. The actuators can be inside the stand 45 be arranged. Adjusting the rail system 38 downwards is used to insert the new plates into the plate changer synchronously with one another 6th , 7th , especially the shafts 9 . Said Upward adjustment is also used to pull the old plates out of the plate changer synchronously with each other 6th , 7th , especially the shafts 10 .

The control cams 44 are on a pole 47 arranged on which an actuator 48 who attacks the pole 47 in the direction x moves to the pole 47 in the required position, e.g. B. to open the gripper 42 to switch. Every control curve 44 has a direction x inclined slope that occurs when adjusting the control cam 44 in the direction x on a cam roller 51 on the plate 43 pushes, causing the rod 47 in the direction y is moved to over with the grippers 42 connected lever the gripper 42 to operate.

When handing over the respective printing plate 8th from the second conveyor belt 31 on the corresponding bar 41 is the second conveyor belt 31 When folded down, it is in its said first operating position. The pressure plate to be transferred and located in the vertical position is hereby 8th pneumatically, i.e. through the suction box of the second conveyor belt 31 , held on to the latter. The end of the pressure plate pointing upwards 8th protrudes over the second conveyor belt 31 and the funding level 33 out and can therefore be used by the grippers 42 just be taken. A hook-shaped fold of said protruding end of the pressure plate 8th serves to securely attach the pressure plate 8th on the plate cylinder of the printing unit and has the additional effect of securing the printing plate 8th against their slipping out of the then closed grippers 42 .

To switch the charging station 14th from loading the pallet 26th with the old panels onto the unloading of the new panels from the pallet 12th becomes the sled 20th with the first and second pallet carrier 16 , 17th along the rail 21 in the direction y procieedings. This is the first pallet carrier 16 with the pallet still filled with the new panels 12th in an active position with respect to direction x aligned opposite of the first pallet carrier 16 with the swivel arm 23 brought and arrives the second pallet carrier 17th into a passive position on the drive side of the printing machine 1 like this in 2 is shown. The swivel arm 23 takes over the new panels one after the other from the pallet during unloading 12th and places them on the belt conveyor 28 from.

To switch the charging station 14th from unloading the new panels from the pallet 12th on loading the pallet 26th the sledge is made with the old panels 20th with the first and second pallet carrier 16 , 17th along the rail 21 move in the opposite direction. The second pallet carrier will be used 17th with the still empty pallet 26th for the old panels in the active position with respect to direction x aligned opposite with the swivel arm 23 brought and arrives the first pallet carrier 16 into a passive position on the operator side of the printing machine 1 . The swivel arm 23 takes over the old panels one after the other from the belt conveyor during loading 28 and puts them in the palette 26th from.

On the first pallet carrier 16 two separation devices are arranged, one on the drive side of the printing machine 1 lying end of the first pallet carrier 16 and the other at the operator-side end. The two separating devices are constructed mirror-symmetrically to one another, which is why the following with reference to FIG 3 until 6th only one separating device needs to be described and this description also applies in a figurative sense to the other separating device.

The separating device has an air blowing element 54 with z. B. two air nozzles 67 on whose air jets 68 during operation on the upward-facing narrow side of a stack of panels 53 are directed to the printing plates 8th in the palette 12th form. Through the air jets 68 are those inside the stack of plates 53 pressure plates lying further above 8th fanned out, the blown air in the spaces between these z. B. two printing plates 8th penetrates, as in 4th indicated. This will increase the adhesion of these printing plates 8th reduced to each other, so that when unloading the swivel arm 23 the topmost printing plate 8th easily from the stack of plates 53 can take off, as in 5 recognizable. The air-blowing organ 54 is a blowpipe with a connector 69 for blown air, e.g. B. a hose connector for a compressed air hose. The two air nozzles 67 form a row that is parallel with an axis of rotation 63 runs, and the air jets 68 are transverse to the axis of rotation 63 oriented. The air-blowing organ 54 is operated by an actuator 64 around the axis of rotation 63 rotated, so also with decreasing height in the course of the separation H of the stack of plates the air nozzles 67 always aim precisely at the topmost stack area.

This tracking is done by a button 55 and a linkage 56 causes over which the air blowing organ 54 and the button 55 are mechanically linked so that they move together. As in 6th best recognizable is the linkage 56 a paddock 59 on that has a swivel joint with a first swing arm 57 and another swivel joint with a second rocker arm 58 connected is. In addition to these two swivel joints, which are not designated in more detail, there is a first swivel joint 61 over which the first swing arm 57 with a plate 60 connected, and a second swivel joint 62 over which the second swing arm 58 with the plate 60 connected is present. The first swivel joint 61 has the geometric axis of rotation 63 on. The button 55 is as an extension of the paddock 59 formed, with a flat side of the coupling 59 and one flat side of the button 55 are oriented orthogonally to each other and the first rocker 57 about in the middle of the paddock 59 and button 55 existing structural unit is hinged. The first swing arm 57 has a first arm 65 that at the paddock 59 is articulated, and a second arm 66 on which the actuator 64 is hinged. This is designed as a pneumatic working cylinder and engages with its piston rod on the first rocker 57 on. The air-blowing organ 54 is with the first swing arm 57 non-rotatably connected, so that both only together around the axis of rotation 63 are rotatable.

• Zu Beginn der Vereinzelung befinden sich noch alle Druckplatten 8 (Neuplatten) für die Druckwerke 2, 3 in der Palette 12, die sich im ersten Palettenträger 16 befindet. Der Stellantrieb 64 bzw. seine Kolbenstange wird ausgefahren, wodurch das Koppelgetriebe 56 in eine erste Richtung geschwenkt wird und das Luftblasorgan 54 bezüglich 3 entgegen dem Uhrzeigersinn um die Drehachse 63 gedreht wird. Dabei schlägt der Taster 55 an der Flachseite der innerhalb des Plattenstapels 53 obersten Druckplatte 8 an, wodurch eine Endlage des Koppelgetriebes 56 bestimmt wird, in der die Blasdüsen 67 auf den Spalt zwischen der obersten und der darunter liegenden Druckplatte 8 ausgerichtet sind. Dann wird die Druckluftzufuhr aktiviert, sodass kurz vorm Abheben der obersten Druckplatte 8 durch den Schwenkarm 23 die Blasdüsen 67 in besagten Spalt hineinblasen, wie in 4 angedeutet. Durch die in den sich dabei erweiternden Spalt eindringende Blasluft wird die oberste Druckplatte 8 weg von der darunter liegenden Druckplatte 8 gedrängt, wodurch das Aneinanderhaften der beiden Druckplatten 8 verringert wird. Danach wird die Druckluftzufuhr wieder deaktiviert und durch den Stellantrieb 64 das Koppelgetriebe 56 in eine zweite Richtung geschwenkt. Dabei wird das Luftblasorgan im Uhrzeigersinn gedreht und der Taster 55 aus dem Überlappungsbereich mit der Flachseite der obersten Druckplatte 8 herausgeschwenkt, sodass der Taster 55 beim nachfolgenden Abheben der obersten Druckplatte 8 diese nicht blockiert.

The separation device works as follows:

• At the beginning of the separation there are still all the printing plates 8th (New plates) for the printing units 2 , 3 in the palette 12th that is in the first pallet carrier 16 is located. The actuator 64 or its piston rod is extended, whereby the linkage 56 is pivoted in a first direction and the air blowing member 54 with reference to 3 counterclockwise around the axis of rotation 63 is rotated. The button strikes 55 on the flat side of the inside of the plate stack 53 top pressure plate 8th on, whereby an end position of the linkage 56 is determined in which the air nozzles 67 on the gap between the uppermost and the lower pressure plate 8th are aligned. Then the compressed air supply is activated so that the top pressure plate is just about to be lifted off 8th through the swivel arm 23 the air nozzles 67 blow into said gap, as in 4th indicated. The top pressure plate is created by the blown air penetrating into the widening gap 8th away from the underlying pressure plate 8th urged, causing the two pressure plates to stick together 8th is decreased. The compressed air supply is then deactivated again and activated by the actuator 64 the linkage 56 pivoted in a second direction. The air blowing element is turned clockwise and the button 55 from the area of overlap with the flat side of the top pressure plate 8th swiveled out so that the button 55 when the top pressure plate is subsequently lifted off 8th this is not blocked.

After that, the explained sequence is carried out one after the other with all in the plate stack 53 following printing plates 8th repeated, taking the height H of the plate stack 53 with each removal of a printing plate 8th from the stack of plates 53 decreases. The linkage 56 is based on a kinematic chain that ensures that the air nozzles 67 for each printing plate to be separated 8th of the plate stack 53 each in an optimal blowing position relative to the uppermost pressure plate 8th be aligned.

The air nozzles 67 can have comparatively small nozzle openings due to their tracking and the air jets 68 bundle them comparatively strongly, which avoids or at least reduces false air proportions.

List of reference symbols

1

Printing press

2

Printing unit

3

Printing unit

4th

Investors

5

stack

6th

Record changer

7th

Record changer

8th

printing plate

9

Manhole

10

Manhole

11

Floor conveyor

12th

palette

13th

Pallet lift

14th

Charging station

15th

Suction head

16

first pallet carrier

17th

second pallet carrier

18th

third pallet carrier

19th

Linkage

20th

sleds

21

rail

22nd

Actuator

23

Swivel arm

24

axis

25th

Transport side

26th

palette

27

first conveyor belt

28

Belt conveyor

29

Sheet feed table

30th

Lifting suction device

31

second conveyor belt

32

axis

33

Funding level

34

Plate conveyor

35

dare

36

Traction means

37

drive wheel

38

Rail system

39

upper rail piece

40

horizontal rail

41

bar

42

Grapple

43

plate

44

Control curve

45

Stand

46

vertical rail

47

pole

48

Actuator

49

wave

50

Telescopic rail guide

51

Cam roller

52

Actuator

53

Stack of plates

54

Air blowing device

55

Button

56

Linkage

57

first swing arm

58

second swing arm

59

Paddock

60

plate

61

first swivel joint

62

second swivel joint

63

Axis of rotation

64

Actuator

65

first arm

66

second arm

67

Air nozzle

68

Air jet

69

connection

H

height

x

direction

y

direction

z

direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10104078 A1 [0002]

Claims (11)

Device for separating printing plates (8), comprising a detection element (23) with suction elements (30) for removing the printing plates (8) from a plate stack (53) and an air blowing element (54) for blowing air onto the plate stack (53), characterized in that the air blowing element (54) is coupled to a button (55) for feeling the uppermost pressure plate (8) of the plate stack (53) and thereby tracks a decreasing height (H) of the plate stack (53). Device according to Claim 1 , characterized in that a coupling gear (56) for pivoting the button (55) is present. Device according to Claim 2 , characterized in that the coupling gear (56) is a four-bar gear with a first rocker (57), a second rocker (58) and a coupling (59). Device according to Claim 3 , characterized in that the button (55) is arranged on the coupling (59). Device according to Claim 3 or 4th , characterized in that the air blowing member (54) is attached to the first rocker (57) and rotates together with this. Device according to one of the Claims 3 until 5 , characterized in that the first rocker (57) is mounted in a plate (60) via a first swivel joint (61) and a geometric axis of rotation (63) of the air blowing element (54) is arranged coaxially with the first swivel joint (61). Device according to Claim 6 , characterized in that the second rocker (58) is connected to the plate (60) via a second swivel joint (62). Device according to one of the Claims 3 until 7th , characterized in that an actuator (64) engages the first rocker (57). Device according to Claim 8 , characterized in that the first rocker (57) has a first arm (65) and a second arm (66), that the first arm (65) is articulated to the coupling (59) and that the actuator (64) on second arm (66) engages. Device according to one of the Claims 1 until 9 , characterized in that the air blowing member (54) is a blow pipe. Device according to Claim 10 , characterized in that it has at least two blower nozzles (67) along the blowpipe.

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