Equipment for sorting printed plates

Abstract

The invention relates to a device for sorting printing plates (8), comprising a gripping device (23) with a suction element (30) for removing the printing plates (8) from a printing plate stack (53) and an air blowing device (54) for blowing air onto the printing plate stack (53). The air blowing device (54) is coupled to a detection head (55) for detecting the uppermost printing plate (8) of the printing plate stack (53) and thereby tracks the descending height (H) of the printing plate stack (53).

Description

Technical Field

[0001] The invention relates to a device for sorting printing plates, the device comprising a gripping mechanism having a suction element for removing printing plates from a stack and an air blowing mechanism for blowing air onto the printing plate stack. Background Art

[0002] DE 101 04 078 A1 describes a device for sorting printing plates. The air blowing mechanism of this device has a blowing gap, which extends over the entire stack height. The device is particularly designed to sort printing plates that have not yet been exposed, which are to be fed to a printing plate exposer. The disadvantage of this device is that as the stack height decreases during the sorting process, the length of the exposed gap that is not covered by the edge of the printing plate increases, and thus the proportion of erroneous air also increases. This can impair efficiency and reliability. Summary of the invention

[0003] The object of the present invention is to provide an order-issuing device which operates reliably and efficiently.

[0004] This task is achieved by a device for sorting printing plates, which includes a gripping mechanism and an air blowing mechanism, wherein the gripping mechanism has a suction element for removing the printing plates from a printing plate stack, and the air blowing mechanism is used to blow air onto the printing plate stack, characterized in that the air blowing mechanism is coupled to a detection head (Taster) for detecting the top printing plate in the printing plate stack and thus tracks the descending height of the printing plate stack.

[0005] The advantage of the device according to the invention is that the air blowing device is always optimally oriented during operation and wrong air is avoided, thereby ensuring high efficiency and high reliability.

[0006] An additional advantage of the device according to the invention is that it is well suited for sorting already exposed printing plates which are to be fed to a printing unit of a printing press. Such exposed printing plates are in practice usually coated with a preservative for their own protection. The preservative is sticky, so that, as an inevitable side effect, the printing plates in the stack adhere particularly firmly to one another.

[0007] The embodiments of the invention described below can be realized individually or (as long as they do not technically exclude one another) in any desired combination with one another:

[0008] The detection head and / or the air blowing mechanism can be movable and / or swingable. The coupling process can be realized in this way: the movement of the detection head will promote the movement and / or swinging movement of the air blowing mechanism, and / or the swinging movement of the detection head will promote the movement and / or swinging movement of the air blowing mechanism. This variant is preferred: in the variant, the swinging movement of the detection head will promote the swinging movement of the air blowing mechanism. This coupling of the air blowing mechanism and the detection head can be realized electronically and / or mechanically. In the case of electronic coupling, the detection head can be a sensor that works contactlessly, such as a spacing sensor. In the case of mechanical coupling, the detection head detects the top printing plate by contacting the top printing plate. According to the present invention, a transmission mechanism that couples the air blowing mechanism with the detection head can be provided, such as a helical gear transmission mechanism or a coupling transmission mechanism. For example, an electronic mechanical coupling can be provided, in which, in order to track, the air blowing mechanism is moved by a helical gear transmission mechanism, and the helical gear transmission mechanism is driven by an electric motor, and the electric motor is driven according to the signal of the spacing sensor.

[0009] It is particularly advantageous if a coupling mechanism is provided for pivoting the probe head.

[0010] The coupling transmission mechanism may be a four-bar transmission mechanism having a first rocker, a second rocker and a connecting rod.

[0011] The detection head can be arranged on the connecting rod, for example, formed thereon or fastened thereto.

[0012] The air blowing mechanism can be fastened to the first swing arm and rotate together with the first swing arm.

[0013] The first pivot lever can be supported in a frame or a plate via a first pivot joint, and the geometrical axis of rotation of the air blowing mechanism can be arranged coaxially with the first pivot joint.

[0014] The second swing arm can be connected to the frame or the plate through a second rotation joint.

[0015] An adjusting actuator (for example a pneumatic or hydraulic working cylinder or another linear drive) can act on the first pivot lever.

[0016] The first rocker can have a first arm and a second arm. The first arm can be connected to the connecting rod in an articulated manner, and / or the adjusting actuator can act on the second arm. The adjusting actuator can act on the second arm either directly or indirectly via an intermediate transmission mechanism. In the case where the adjusting actuator is configured as a working cylinder, the adjusting actuator can act directly on the second arm with its piston rod. In the case where the adjusting actuator is configured as an electric motor, the adjusting actuator can act on the second arm indirectly via a helical gear transmission mechanism.

[0017] The air blowing device can have only a single blowing nozzle, but preferably has at least two blowing nozzles or an arrangement of blowing nozzles.

[0018] The air blowing mechanism can be an air blowing tube.

[0019] The air blowing mechanism is preferably an air blowing pipe, and the air blowing mechanism has at least two air blowing nozzles along the air blowing pipe.

[0020] The device can have a plurality of air blowing mechanisms. For example, a first air blowing mechanism can be arranged near one side edge of the plate stack, and a second air blowing mechanism can be arranged near another side edge, wherein the two air blowing mechanisms are coupled to a common detection head or to each a single detection head.

[0021] The gripping mechanism may be a swing arm.

[0022] The suction element may be a reciprocating suction device.

[0023] The singulation device can be used in a printing plate handling device having a first carriage carrier and a second carriage carrier, but can also be used in a printing plate handling device having only a single carriage carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] From the following description of the exemplary embodiments and the associated drawings, further developments emerge, which can be realized individually or (as long as they are not technically mutually exclusive) in any combination with each other or with the previously mentioned developments.

[0025] Figure 1 A device for handling printing plates on a printing press is shown in side view,

[0026] Figure 2 Shown in top view from Figure 1 equipment,

[0027] Figure 3 Shown in side view Figure 1 and Figure 2A partial view of a device for sorting printing plates,

[0028] Figure 4 The enlarged top view shows the Figure 3 The order splitting equipment,

[0029] Figure 5 Shows the flow of printing plates from the printing plate stack when they are removed. Figure 3 Order splitting equipment, and

[0030] Figure 6 With Figure 3 The opposite direction of sight is from Figure 3 The detailed illustration of the sheet separation device is shown enlarged and without a printing plate stack. DETAILED DESCRIPTION

[0031] The printing press 1 comprises printing units 2, 3 arranged in a row for offset printing on sheets, which form a stack 5 in a feeder 4. Each printing unit 2, 3 is equipped with a plate changer 6, 7 for printing plates 8, which has a shaft 9 for new printing plates 8 (so-called new printing plates) and a shaft 10 for used printing plates 8 (so-called old printing plates). The printing press 1 is combined with a plate logistics system, which transports the printing plates 8 to the plate changer 6, 7 and transports them back after use. The operator removes a tray 12 with the printing plates 8 therein from a floor transport device 11 and delivers the tray 12 to a tray lift 13.

[0032] The orthogonal coordinate system in the drawing includes a vertical direction z and horizontal directions x, y, wherein x corresponds to the longitudinal direction of the printing press 1 and y corresponds to the transverse direction of the printing press 1 .

[0033] The carriage lifting device 13 is arranged in front of the feeder 4 in the direction x and transports the carriage 12 in the directions z and y to a loading and unloading station 14, which is arranged above the stack 5 and the suction head 15 of the feeder 4. The loading and unloading station 14 is used to unload new printing plates from the carriage 12 and load them with old printing plates, and has a first carriage carrier 16 and a second carriage carrier 17, which are arranged one after the other in the direction y. The carriage lifting device 13 has a third carriage carrier 18. The first carriage carrier 16 and the second carriage carrier 17 are fastened to a carriage 20 via a plurality of coupling transmission mechanisms 19, and the carriage 20 can be adjusted in the direction y by means of a rail 21.

[0034] An adjusting actuator 22 is connected to the coupling mechanism 19, by which the first and second tray carriers 16, 17 are pivoted relative to the third tray carrier 18. In this case, the third tray carrier 18 has a gripping action on the tray carrier 16 or 17 that was previously moved along the rail 21 into an opposite position aligned with the third tray carrier 18 in the direction x. During this gripping action, the third tray carrier 18 delivers or transfers the tray to or from the other tray carrier 16 or 17.

[0035] The swivel arm 23 belonging to the loading and unloading station 14, which has a conveying side 25 for the printing plates 8, can be swiveled about an axis 24 extending in the direction y at its lower end. The swivel arm 23 is swiveled from its reference Figure 1 4. The conveying side 25 is swung from its left end position (drawn with a solid line) to its right end position (drawn with a dashed line) and back again and in this process each time flips through its vertically oriented position. In the right end position, the conveying side 25 rises obliquely to the upper right and extends parallel to the first carrier carrier 16 or the second carrier carrier 17 and the corresponding carrier 12 (or 26) therein. In the left end position, the conveying side 25 rises obliquely to the upper left and extends parallel or flush with the conveying run of the first conveyor belt 27 of the belt conveyor 28, which is arranged above the sheet supply table 29 of the feeder 4.

[0036] The swing arm 23 has a reciprocating suction device 30, which extends from the conveying side 25 and grabs the topmost printing plate 8 of the printing plate stack on the carrier 12. The swing arm 23 is swung from the right end position to the left end position together with the printing plate 8 sucked by the reciprocating suction device 30, and the reciprocating suction device 30 moves inward into the swing arm 23 again to place the grabbed printing plate 8 on the first conveyor belt 27. Then, the working cycle of the swing arm 23 is repeated, and the swing arm 23 takes the printing plates 8 out of the carrier 12 one by one and places them on the belt conveyor 28.

[0037] The belt conveyor 28 comprises a second conveyor belt 31, which is supported so as to be alternately swingable about a geometric axis 32 in a first operating position (drawn with a solid line) and in a second operating position (drawn with a dotted line) by adjusting an actuator 52. The second conveyor belt 31 is oriented vertically in the first operating position and forms a common conveying plane 33 with the first conveyor belt 27 in the second operating position. The two conveyor belts 27, 31 are respectively composed of a plurality of endless belts, which have the same length and extend parallel to each other around deflection wheels. The deflection wheels through which the endless belt of the first conveyor belt 27 runs are arranged alternately along the axis 32 with the deflection wheels through which the endless belt of the second conveyor belt 31 runs. In other words: the endless belt of the second conveyor belt 31 runs in the gap between the endless belts of the first conveyor belt 27.

[0038] The oscillating arm 23 has an arrangement of pointed teeth extending in the direction y, which are aligned with the gaps between the endless circulating belts of the first conveyor belt 27 and mesh with these gaps in the left end position of the oscillating arm 23 .

[0039] The first and second conveyor belts 27, 31 are configured as suction belts, on which the printing plate 8 is fixedly held by vacuum during its transport, and the first and second conveyor belts 27, 31 respectively include vacuum boxes. The vacuum boxes suck the printing plate 8 through the gaps between the endless belts or through the perforations in the endless belts, thereby pneumatically holding the printing plate 8 on the endless belts.

[0040] The belt conveyor 28 delivers the new printing plate to the plate conveyor belt 34 arranged above these printing groups 2, 3, and then takes over the old printing plate from the plate conveyor belt 34. The plate conveyor belt 34 includes pulleys 35, the number of which corresponds to the number of printing groups 2, 3 to be supplied with printing plates 8. The pulleys 35 are fastened to an endlessly circulating traction device 36 or mesh with the endlessly circulating traction device (especially a toothed belt) and are jointly driven by the driving wheel 37 via the traction device 36. When the new printing plate is transferred from the loading and unloading station 14 to these printing groups 2, 3, the traction device 36 is referred to Figure 1 The traction device 36 is moved around in a clockwise direction, while the traction device 36 is moved around in a counterclockwise direction when old printing plates are transferred from the printing units 2, 3 to the loading and unloading station 14. Accordingly, the electric motor connected to the drive wheel 37 as a direct drive is reversed to cause the traction device 36 to change direction.

[0041] The rail system 38 for guiding the trolley 35 comprises an upper rail section 39 and a lower rail section, the lower rail section being composed of a horizontal rail 40 extending in the direction x. The entire rail system 38 has an oval or elongated ring shape along which the trolleys 35 circulate. In order to form this ring shape, the upper rail section and the lower rail section are connected to each other at their ends by arcuate rail sections, the upper rail section and the lower rail section being straight and extending parallel to each other.

[0042] On the trolleys 35 are arranged suspended beams 41, which have grippers 42 for holding the printing plates 8 by clamping. The beams 41 extend over their length in the direction y, wherein in the direction y each beam 41 is at least as long as the width of the printing plate 8. In this example, the number of grippers 42 arranged in an array on the shaft 49 is two for each beam 41, and can also be three. The printing plates 8 are suspended vertically on the beams 41 while they are transported along the horizontal rails 40 in synchronization with one another.

[0043] Arranged on a plate 43 are: a control cam 44 for operating a gripper 42, a trolley 35 with a beam 41, a rail system 38 for guiding the trolley 35, and a traction device 36 for driving the trolley 35. The plate 43 is supported by columns 45, each of which is assigned to a different printing unit 2, 3. These columns 45 can be configured as telescopic rail guides 50. Each column 45 forms a vertical rail 46 for guiding these plate members 43 or has such a vertical rail 46. Along the vertical rail 46, the plate 43 together with the aforementioned elements arranged thereon are adjusted downward and upward by one or more adjustment actuators (not shown in the drawing) in these columns 45. These adjustment actuators can be arranged inside these columns 45. The rail system 38 is adjusted downward, which is used to introduce these new printing plates into the plate changer 6, 7 (especially the shaft 9) synchronously with each other. The aforementioned upward adjustment also serves to pull the old printing plates out of the plate changer 6 , 7 (in particular the shaft 10 ) synchronously with one another.

[0044] These control cams 44 are arranged on a rod 47, on which an adjustment actuator 48 acts, which moves the rod 47 in the direction x in order to transfer the rod 47 into the required position (for example, to open the gripper 42). Each control cam 44 has an inclined surface inclined relative to the direction x, which presses on a curved roller 51 on the plate 43 when the control cam 44 is adjusted in the direction x, thereby moving the rod 47 in the direction y in order to operate the gripper 42 via a lever connected to the gripper 42.

[0045] When delivering the individual printing plates 8 from the second conveyor belt 31 to the corresponding beam 41, the second conveyor belt 31 is turned downward, i.e., it is in its aforementioned first operating position. Here, the printing plates 8 to be delivered and in a vertical position are held pneumatically (i.e., by the suction box of the second conveyor belt 31) on the second conveyor belt 31. The ends of the printing plates 8 pointing upward here protrude beyond the second conveyor belt 31 and the conveying plane 33 and can therefore be easily gripped by the gripper 42. The hook-shaped bend of the aforementioned protruding end of the printing plate 8 serves to securely fasten the printing plate 8 to the plate cylinder of the printing unit and has the additional effect here of securing the printing plate 8 to prevent it from slipping out of the gripper 42 that is subsequently closed.

[0046] In order to switch the loading and unloading station 14 from loading the carriage 26 with old printing plates to unloading new printing plates from the carriage 12, the carriage 20 with the first and second carriage carriers 16, 17 is moved along the rails 21 in the direction y. In this process, the first carriage carrier 16 with the carriage 12 still loaded with printing plates is brought into the active position, in which the first carriage carrier 16 and the swivel arm 23 are in an opposite position aligned with reference to the direction x, and the second carriage carrier 17 is brought into the passive position on the drive side of the printing press 1, as shown in FIG. Figure 2 The swing arm 23 takes over new printing plates from the carriage 12 one by one during unloading and places them on the belt conveyor 28 .

[0047] In order to switch the loading and unloading station 14 from unloading new printing plates from the carriage 12 to loading the carriage 26 with old printing plates, the carriage 20 and the first and second carriage carriers 16, 17 are moved in opposite directions along the rails 21. In this process, the second carriage carrier 17 with the still empty carriage 26 for the old printing plates is brought into the active position, in which it is in an opposite position aligned with the reference direction x with the swivel arm 23, and the first carriage carrier 16 is brought into the passive position on the operating side of the printing press 1. During loading, the swivel arm 23 successively takes over the old printing plates from the belt conveyor 28 and places them in the carriage 26.

[0048] Two sheet-separating devices are arranged on the first carrier 16, one sheet-separating device is at the end of the first carrier 16 on the drive side of the printing press 1, and the other sheet-separating device is at the end on the operating side of the printing press 1. The two sheet-separating devices are designed to be mirror-symmetrical to each other, so that they will be referred to in the following. Figures 3 to 6 Only one order-issuing device needs to be described and this description also applies to the other order-issuing device in the sense of transfer.

[0049] The sheet separation device has an air blowing device 54, which has, for example, two blowing nozzles 67, the air jets 68 of which are directed during operation at the upwardly directed narrow sides of the printing plate stack 53 formed by the printing plates 8 in the carrier 12. The air jets 68 fan out the printing plates 8 located further up within the printing plate stack 53, wherein the blowing air enters, for example, the intermediate space between two printing plates 8, such as in Figure 4 As shown in FIG. , the adhesion of the two printing plates 8 to each other is reduced, so that when the swing arm 23 is unloaded, the uppermost printing plate 8 can be removed from the printing plate stack 53 without any problems, as in FIG. Figure 5 The air blowing device 54 is a blow pipe with a connection 69 for blowing air (for example, a hose connection for a compressed air hose). The two blow nozzles 67 form an arrangement extending parallel to the rotation axis 63, and the air jets 68 are oriented transversely to the rotation axis 63. The air blowing device 54 is rotated about the rotation axis 63 by adjusting the actuator 64, so that the blow nozzles 67 are always accurately aimed at the uppermost stacking area at the height at which the printing plate stack is lowered during the ordering process.

[0050] This tracking is achieved by the detection head 55 and the coupling transmission mechanism 56, through which the air blowing mechanism 54 is mechanically connected to the detection head 55 so that they move together. Figure 6 As can be best seen in FIG. 1 , the coupling mechanism 56 has a connecting rod 59, which is connected to the first swing rod 57 via a swivel joint and to the second swing rod 58 via another swivel joint. In addition to the two swivel joints not shown, a first swivel joint 61, via which the first swing rod 57 is connected to a plate 60, and a second swivel joint 62, via which the second swing rod 58 is connected to the plate 60. The first swivel joint 61 has a geometric axis of rotation 63. The probe head 55 is designed as an extension of the connecting rod 59, wherein the flat side of the connecting rod 59 and the flat side of the probe head 55 are oriented orthogonally to each other, and the first swing rod 57 is articulated approximately in the center of the structural unit consisting of the connecting rod 59 and the probe head 55. The first swing rod 57 has a first arm 65, which is articulated on the connecting rod 59, and a second arm 66, which is articulated on the adjusting actuator 64. The adjusting actuator 64 is designed as a pneumatic working cylinder and acts with its piston rod on the first pivot lever 57. The air blowing mechanism 54 is connected to the first pivot lever 57 in a rotationally fixed manner, so that both can only be rotated together about the rotation axis 63.

[0051] The order splitting device works as follows:

[0052] At the beginning of the order separation, all the printing plates 8 (new printing plates) for the printing units 2 and 3 are still located in the carriage 12, which is located in the first carriage carrier 16. The adjusting actuator 64 (or its piston rod) moves outward, whereby the coupling transmission mechanism 56 is swung in the first direction, and the air blowing mechanism 54 is moved with reference to the first direction. Figure 3 The sensor head 55 acts on the flat side of the top printing plate 8 inside the plate stack 53, thereby determining the final position of the coupling drive mechanism 56, in which the blowing nozzle 67 is aligned with the gap between the top printing plate 8 and the printing plate 8 located below it. Then, the compressed air supply device is activated, so that the blowing nozzle 67 blows air into the aforementioned gap before the swing arm 23 removes the top printing plate 8, such as Figure 4 As shown in the figure. The blowing air entering into the widened gap causes the top printing plate 8 to be pushed away from the printing plate 8 located below it, thereby reducing the mutual adhesion of the two printing plates 8. Then, the compressed air supply device is deactivated again, and the coupling transmission mechanism 56 is swung in the second direction by adjusting the actuator 64. Here, the air blowing mechanism rotates in the clockwise direction, and the detection head 55 is swung out of the overlapping area with the flat side of the top printing plate 8, so that the detection head 55 will not get stuck when the top printing plate 8 is removed next.

[0053] The explained process is then repeated successively for all printing plates 8 that follow one another in the printing plate stack 53, wherein the height H of the printing plate stack 53 decreases each time a printing plate 8 is removed from the printing plate stack 53. The coupling drive 56 is based on a kinematic chain, which ensures that the blowing nozzle 67 orients each printing plate 8 to be singulated of the printing plate stack 53 in the respectively optimal blowing position relative to the respectively uppermost printing plate 8.

[0054] Due to their tracking effect, the blowing air nozzles 67 can have relatively small nozzle openings and focus the air jets 68 relatively strongly, thereby avoiding or at least reducing incorrect air portions.

[0055] Reference numerals list

[0056] 1 Printing press

[0057] 2 Printing unit

[0058] 3 Printing unit

[0059] 4 Feeder

[0060] 5. Stacking

[0061] 6 Plate Changer

[0062] 7 Plate Changer

[0063] 8 print version

[0064] 9 Hoistway

[0065] 10 Well

[0066] 11 Ground Transportation Devices

[0067] 12 Bracket

[0068] 13 Bracket lifting device

[0069] 14 Loading and unloading station

[0070] 15 Suction head

[0071] 16 First bracket carrier

[0072] 17 Second bracket carrier

[0073] 18 Third bracket carrier

[0074] 19 Coupling transmission mechanism

[0075] 20 Slide

[0076] 21 tracks

[0077] 22 Adjusting the actuator / servo drive

[0078] 23 Swing arm (grasping mechanism)

[0079] 24 Axis

[0080] 25 Conveying side

[0081] 26 Bracket

[0082] 27 First Conveyor Belt

[0083] 28 Belt conveyor

[0084] 29-sheet feed table

[0085] 30 Reciprocating suction device (suction element)

[0086] 31 Second conveyor belt

[0087] 32 Axis

[0088] 33 Transmission plane

[0089] 34 Plate transport

[0090] 35 Pulley

[0091] 36 Traction Devices

[0092] 37 Drive wheel

[0093] 38-track system

[0094] 39 Upper track section

[0095] 40 Horizontal rail

[0096] 41 Liang

[0097] 42 Grab

[0098] 43 Panels

[0099] 44 Control curves / control cams

[0100] 45 Column

[0101] 46 vertical rail

[0102] 47 shots

[0103] 48 Adjusting the actuator / servo drive

[0104] 49 Axis

[0105] 50 Telescopic rail guide

[0106] 51 Curve Roller

[0107] 52 Adjusting actuators / servo drives

[0108] 53 Plate stacking

[0109] 54 Air blowing mechanism

[0110] 55 Detector Head

[0111] 56 Coupling transmission mechanism

[0112] 57 First Swing

[0113] 58 Second swing

[0114] 59 Connecting rod

[0115] 60 Panels

[0116] 61 First revolute joint

[0117] 62 Second revolute joint

[0118] 63 Rotation axis

[0119] 64 Adjustment of actuators / servo drives

[0120] 65 First Arm

[0121] 66 Second Arm

[0122] 67 Air blowing nozzle

[0123] 68 Air Beam

[0124] 69 Connector

[0125] H Height

[0126] x direction

[0127] y direction

[0128] z-direction.

Claims

1. A device for sorting printing plates (8), the device comprising: a gripping device (23) having a suction element (30) for removing a printing plate (8) from a printing plate stack (53), and - an air blowing mechanism (54) for blowing air onto the printing plate stack (53), It is characterized in that The air blowing device (54) is coupled to a detection head (55) and thereby tracks the descending height (H) of the printing plate stack (53), wherein the detection head is used to detect the uppermost printing plate (8) of the printing plate stack (53). A coupling transmission mechanism (56) is provided for swinging the detection head (55). The coupling transmission mechanism (56) is a four-link transmission mechanism having a first swing rod (57), a second swing rod (58) and a connecting rod (59). The first swing rod (57) is supported in the plate (60) via a first rotation joint (61), and The geometric rotation axis (63) of the air blowing mechanism (54) is arranged coaxially with the first rotation joint (61).

2. The device according to claim 1, It is characterized in that The detection head (55) is arranged on the connecting rod (59).

3. The device according to claim 1 or 2, It is characterized in that The air blowing mechanism (54) is fastened to the first swing arm (57) and rotates together with the first swing arm.

4. The device according to claim 1 or 2, It is characterized in that The second swing rod (58) is connected to the plate (60) via a second rotation joint (62).

5. The device according to claim 1 or 2, It is characterized in that An adjusting actuator (64) acts on the first rocker (57).

6. The device according to claim 5, It is characterized in that The first rocker (57) has a first arm (65) and a second arm (66), the first arm (65) being connected to the connecting rod (59) in an articulated manner, and the adjusting actuator (64) acting on the second arm (66).

7. The device according to claim 1 or 2, It is characterized in that The air blowing mechanism (54) is an air blowing pipe.

8. The device according to claim 7, It is characterized in that Along the blowing pipe, the blowing pipe has at least two blowing nozzles (67).

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