CN113135032A

CN113135032A - Device for handling printing plates on a printing press

Info

Publication number: CN113135032A
Application number: CN202110011223.8A
Authority: CN
Inventors: M·默林格; S·穆沙尔; K·莱纳特
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 2020-01-20
Filing date: 2021-01-06
Publication date: 2021-07-20
Also published as: DE102020207421A1; EP3851279B1; CN113147174A; EP3851279A1; CN113135033A; CN113135036A; DE102020207415A1; CN113135035A; DE102020207418A1; DE102020207419A1; CN113135034A; EP3851280B1; EP3851281B1; CN113135031A; EP3851280A1; CN113147173A; DE102020207420A1; EP3851281A1

Abstract

The invention relates to a device for printing plate handling on a printing press (1) having a first printing unit (2) and a second printing unit (3), comprising a belt conveyor (28) for printing plates (8). The belt conveyor (28) is arranged for conveying the first printing plate (8) and the second printing plate (8) in a conveying direction (T) towards the first printing unit and the second printing unit. An orientation device (53) is provided, which orients the first printing plate (8) in line with the first printing unit and the second printing plate (8) in line with the second printing unit laterally transversely to the conveying direction (T).

Description

Device for handling printing plates on a printing press

Technical Field

The invention relates to a device for printing form handling (Handhakung) on a printing press having a first printing unit and a second printing unit, comprising a belt conveyor for printing forms.

Background

In EP 2338683B 1, an apparatus for printing plate handling is described, which has a belt conveyor by which used printing plates are conveyed to a disposal basket, so that there is no high requirement for conveying accuracy.

In the production and installation of multicolor printing presses, dimensional deviations from the plate cylinder or the plate changer, within predetermined tolerances, are unavoidable due to the different printing units, which can prevent the automatic feeding of new printing plates.

Disclosure of Invention

The object of the invention is to provide a printing plate handling device which works with high transport accuracy.

The object is achieved by an apparatus for printing form manipulation on a printing press having a first printing unit and a second printing unit, comprising a belt conveyor for printing forms, characterized in that the belt conveyor is arranged for conveying a first printing form and a second printing form in a conveying direction towards the first printing unit and the second printing unit, and in that an orientation device is provided which orients the first printing form laterally (transversely to the conveying direction) in a manner adapted to the (gerecht) first printing unit and the second printing form in a manner adapted to the second printing unit.

The advantage of the device according to the invention is that it is suitable not only for transporting used printing plates, but also for transporting new printing plates.

The embodiments of the invention described below can be implemented individually or (as long as they are not technically mutually exclusive) in any desired combination with one another:

the alignment device can have a control device in which a first setpoint value for the alignment of the first printing forme to the first printing unit and a second setpoint value for the alignment of the second printing forme to the second printing unit are stored.

The control device may be connected to a sensor which measures the actual value of the position of the first and second printing plates in the lateral direction and signals the control device.

The belt conveyor may have a first conveyor belt and a second conveyor belt that is swingable into a position aligned with the first conveyor belt and a position angled with respect to the first conveyor belt.

The sensor can be assigned to the second conveyor belt in order to measure the lateral position of the first printing plate or the second printing plate, respectively, held there on the second conveyor belt in the angular position of the second conveyor belt.

The control device can be connected to a servo drive/regulating actuator (stellrantrieb) which, when oriented, moves the belt conveyor in the lateral direction in order to compensate for deviations between nominal and actual (or differences between nominal and actual). The adjustment actuator may drive the belt conveyor through a helical gear drive to laterally advance the belt conveyor.

The belt conveyor may be guided by a linear guide while traveling sideways.

The belt conveyor may have at least one vacuum box having a negative pressure acting therein for holding the first and second printing plates and, when oriented, the belt conveyor travels laterally along with the vacuum box.

According to the invention, an adjusting actuator and a linear guide can be provided for advancing the conveyor belt of the belt conveyor in a lateral direction during the orientation.

Drawings

The following description of the exemplary embodiments and the associated drawings yields further developments which can be implemented individually or (as long as they are not technically mutually exclusive) in any combination with one another or with the developments already mentioned. Shown in the drawings are:

figure 1 shows in side view an apparatus for handling printing plates on a printing press,

figure 2 shows the device from figure 1 in a top view,

FIG. 3 shows the belt conveyor from the apparatus of FIGS. 1 and 2 in an enlarged side view, and

fig. 4 shows the belt conveyor from fig. 3 in a top view.

Detailed Description

The printing press 1 comprises printing couples 2, 3 arranged in a row for offset printing on sheets, which form a stack 5 in a feeder 4. Each printing couple 2, 3 is equipped with a

plate changer

6, 7 for printing plates 8, which

plate changers

6, 7 have 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 changers

6, 7 and back again after use. The operator takes out the carrier 12 with the printing plates 8 therein from the ground transport means 11 and delivers the carrier 12 to the carrier lifting device 13.

The orthogonal coordinate system in the drawing includes a vertical direction z and horizontal directions x, y, where x coincides with the longitudinal direction of the printing press 1 and y coincides with the transverse direction of the printing press 1.

A pallet lift 13 is arranged in front of the feeder 4 in the direction x and conveys the pallets 12 in the directions z and y to a loading and unloading station 14, which loading and unloading station 14 is arranged above the stack 5 and the suction head 15 of the feeder 4. The loading and unloading station 14 serves for unloading new printing plates from the carrier 12 and loading them with old printing plates and has a first carrier 16 and a second carrier 17, which first carrier 16 and second carrier 17 are arranged one behind the other in the direction y. The carriage lifting device 13 has a third carriage carrier 18. The first and

second carrier elements

16, 17 are fastened via a plurality of coupling mechanisms 19 to a carriage 20, which carriage 20 is adjustable in the direction y guided by rails 21.

An adjustment actuator 22 is connected to the coupling gear 19, by means of which adjustment actuator 22 the first and

second carrier elements

16, 17 are pivoted relative to the third carrier element 18. Here, the third carriage carrier 18 grips that

carriage carrier

16 or 17 which has been moved along the rail 21 into the opposite position aligned in the direction x with the third carriage carrier 18 in advance. In this gripping action (Durchgreifen), the third carrier 18 delivers or transfers carriers to or from the

other carrier

16 or 17.

The pivoting arm 23 belonging to the loading and unloading station 14, which has a transport side 25 for the printing plate 8, can be pivoted about an axis 24 extending in the direction y on its lower end. The pivot arm 23 pivots from its left end position (drawn with a solid line) in fig. 1 into its right end position (drawn with a dashed line) and pivots back again and in this case pivots through its vertically oriented position each time. In the right end position, the conveying side 25 rises obliquely to the right and upwards and runs parallel to the first or

second rack carrier

16 or 17 and the respective rack 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 return section of a first conveyor belt 27 of a belt conveyor 28, which belt conveyor 28 is arranged above a sheet feed table 29 of the feeder 4.

The pivot arm 23 has a reciprocating suction device 30, which suction device 30 projects from the conveying side 25 and grips the uppermost printing plate 8 of the plate stack on the carrier 12. The swing arm 23 is swung together with the printing plate 8 sucked by the reciprocating suction 30 from the right end position into the left end position, wherein the reciprocating suction 30 is moved inward again into the swing arm 23 in order to place the gripped printing plate 8 on the first conveyor belt 27. The working cycle of the swing arm 23 is then repeated, said swing arm 23 taking the printing plates 8 one by one out of the carriage 12 and placing them on the belt conveyor 28.

The belt conveyor 28 comprises a second conveyor belt 31, which second conveyor belt 31 is supported by an adjustment actuator 52 so as to be able to pivot about a geometric axis 32 alternately in a first operating position (drawn with solid lines) and in a second operating position (drawn with broken lines). The second conveyor belt 31 is vertically oriented 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 each formed by a plurality of endless circulating belts which have the same length and extend parallel to one another around the deflecting roller. The diverting wheels by which the endless circulating belt of the first conveyor belt 27 runs are arranged along the axis 32 alternately with the diverting wheels by which the endless circulating belt of the second conveyor belt 31 runs. In other words: the endless circulating belts of the second conveyor belt 31 run in the gaps between the endless circulating belts of the first conveyor belt 27.

The oscillating arm 23 has an arrangement of tines extending in direction y, which are aligned with and engage with the gaps between the endless circulating belts of the first conveyor belt 27 in the left terminal position of the oscillating arm 23.

The first and

second conveyor belts

27, 31 are configured as suction belts on which the printing plates 8 are held by vacuum fixing during their conveyance, and the first and

second conveyor belts

27, 31 respectively comprise vacuum boxes. The vacuum boxes suck the printing plates 8 through the spaces between the endless circulating belts or through the perforations in the endless circulating belts, so that the printing plates 8 are held pneumatically on these endless circulating belts.

The belt conveyor 28 delivers new printing plates to a plate conveyor 34 arranged above these printing couples 2, 3 and subsequently takes up old printing plates from the plate conveyor 34. The plate conveyor 34 comprises pulleys 35, the number of said pulleys 35 corresponding to the number of printing couples 2, 3 to be fed with printing plates 8. The carriage 35 is fastened to or engages with a traction means 36 of the endless loop, in particular a toothed belt, and is jointly driven by a drive wheel 37 via the traction means 36. In the case of transfer of new printing plates from the loading and unloading station 14 to these printing couples 2, 3, the drawing means 36 circulate in a clockwise direction with reference to fig. 1, whereas in the case of transfer of old printing plates from the printing couples 2, 3 to the loading and unloading station 14, the drawing means 36 circulate in a counterclockwise direction. Accordingly, the electric motor connected to the drive wheel 37 as a direct drive is reversed in order to cause a change of direction of the traction means 36.

The rail system 38 for guiding the carriage 35 comprises an upper rail section 39 and a lower rail section, which is formed by a horizontal rail 40, which horizontal rail 40 extends in the direction x. The entire rail system 38 has an oval or elongated ring shape along which the carriages 35 circulate. In order to form such a loop shape, the upper rail section and the lower rail section are connected to one another at their ends by curved rail sections, which are straight and extend parallel to one another.

On these trolleys 35 there are arranged suspended beams 41, said beams 41 having grippers 42 for holding the printing plates 8 by clamping. These beams 41 extend over their length in direction y, wherein each beam 41 is at least as long as the width of the printing plate 8 in direction y. In this example, the number of grippers 42 arranged in an array on the shaft 49 is two, and may also be three, for each beam 41. The printing plates 8 are suspended vertically on the beams 41 while they are transported along the horizontal rails 40 in synchronism with each other.

Disposed on a plate 43 are: a control cam 44 for operating the gripper 42, a carriage 35 with a beam 41, a rail system 38 for guiding the carriage 35, and a traction means 36 for driving the carriage 35. The plate 43 is supported by uprights 45, each upright 45 in these uprights 45 being assigned to a different printing group 2, 3. These uprights 45 can be configured as telescopic rail guides 50. Each upright 45 forms a vertical rail 46 for guiding the plate elements 43 or has such a vertical rail 46. Along the vertical rails 46, the plate 43, together with the aforementioned elements arranged thereon, is adjusted downwards and upwards by one or more adjustment actuators (not shown on the drawing) in these uprights 45. The adjustment actuators may be arranged inside the uprights 45. The rail system 38 is adjusted downward, which is used to introduce the new printing plates into the plate changers 6, 7 (in particular the shaft 9) synchronously with one another. The aforementioned upward adjustment is also used to pull the old printing plates out of the plate changers 6, 7 (in particular the shaft 10) in synchronism with each other.

These control cams 44 are arranged on a lever 47, on which lever 47 an adjustment actuator 48 acts, which adjustment actuator 48 moves the lever 47 in the direction x in order to switch the lever 47 into the required position (for example in order to open the gripper 42). Each control cam 44 has a slope inclined with respect to the direction x, which, when the control cam 44 is adjusted in the direction x, presses onto the curved roller 51 on the plate 43, thereby moving the lever 47 in the direction y in order to operate the gripper 42 by means of a lever connected to the gripper 42.

When transferring each printing plate 8 from the second conveyor belt 31 to the respective beam 41, the second conveyor belt 31 is turned downwards, i.e. the second conveyor belt 31 is in its aforementioned first operating position. Here, the printing plates 8 to be delivered and in the vertical position are held pneumatically (i.e. by the suction box of the second conveyor belt 31) on this second conveyor belt 31. The end of the printing plate 8 pointing upwards in this case projects beyond the second conveyor belt 31 and the conveying plane 33 and can therefore be easily gripped by the gripper 42. The aforementioned hook-shaped edge of the projecting end of printing plate 8 serves to securely fasten printing plate 8 to a plate cylinder of a printing unit and has the additional effect here: the printing plate 8 is secured against slipping out of the gripper 42 which is subsequently closed.

To switch the loading and unloading station 14 from the used plate loading carrier 26 to unload a new plate from the carrier 12, the carriage 20 and the first and

second carrier carriers

16, 17 are moved along the rails 21 in the direction y. In this case, the first carriage carrier 16 with the carriage 12 still loaded with printing plates is brought into an active position, in which the first carriage carrier 16 is in an opposite position aligned with the pivot arm 23 with reference to the direction x, and the second carriage carrier 17 is brought into a passive position on the drive side of the printing press 1, as is shown in fig. 2. The swing arm 23 in turn receives new printing plates from the carrier 12 when unloading and it rests on the belt conveyor 28.

To convert the loading and unloading station 14 from unloading new plates from the carrier 12 to loading the carrier 26 with used plates, the carriage 20 and the first and

second carrier carriers

16, 17 are moved in opposite directions along the rails 21. In this case, the second carriage carrier 17 with the empty carriage 26 for the old printing plates is brought into an active position, in which the second carriage carrier 17 is in a facing position aligned with the pivot arm 23 with reference to the direction x, and the first carriage carrier 16 is brought into a passive position on the operating side of the printing press 1. At the time of loading, the swing arm 23 sequentially takes the used printing plates from the belt conveyor 28 and places them in the carriage 26.

In fig. 3 and 4, an orientation device 53 of the belt conveyor 28 is shown, which orientation device 53 is not shown together in fig. 1 and 2 for reasons of simplicity of the drawing. The printing plate 8, in particular a new printing plate, is oriented in direction y (i.e. orthogonally with respect to the conveying direction T of the belt conveyor 28) by means of an orientation device 53.

This may be necessary in order to compensate for lateral deviations of the printing couples 1, 2. These deviations may relate to register deviations of the plate cylinders on which the printing plates 8 are to be clamped and tolerance deviations of the

plate changers

6, 7, in particular the shaft 9. In the electronic control device 54, for each printing unit 1, 2, its individual setpoint value for the lateral orientation of the individual printing formes 8 (y-setpoint position of the printing formes 8) is stored.

The printing forme 8 is transported by the second conveyor belt 31, with frictional engagement therewith, towards a stop 61 (so-called front label) arranged on the belt conveyor 28 and is oriented in the transport direction by this stop 61. The y-actual position of the printing plate 8 is then measured by the sensor 55 and signaled to the control device 54. This is done during the printing plates 8 are on the second conveyor belt 31 turned downwards. The sensor 55 is a line sensor (e.g., a CCD line sensor) and is separately and independently secured to the frame relative to the second conveyor belt 31.

The control device 54, which is programmed accordingly, carries out the comparison between nominal and actual values, and it actuates the regulating actuator 56 as a function of the comparison between nominal and actual values. The adjustment actuator 56 thus moves the belt conveyor 38 and thus also the second conveyor belt 31 together with the printing plate 8 held stationary thereon in the direction y or against the direction y by the amount necessary for compensation.

The printing formes 8 are thus delivered by the second conveyor belt 31 into the gripper 42 in the lateral orientation required for the printing couples 1, 2 for which the printing formes 8 are intended, in which gripper 42 the printing formes 8 maintain the required orientation up to the printing couple 1 or 2. After the transfer of the printing plate 8, the belt conveyor 28 travels back again into its initial position (preferably the intermediate position) in order to position the next printing plate 8. The process described here is repeated from printing form 8 to printing form 8, the amount required for compensation being able to be of different sizes for each printing unit 1, 2.

It is therefore advantageous to ensure that, before a new printing plate is introduced simultaneously into the plate changers 6, 7 (this is achieved by the sinking of the plate conveyor 34 already explained above), the state is: in this state, above each

plate changer

6, 7, a new plate intended for this plate changer is suspended on the respective gripper 42 and is fixed in the desired y-orientation by its clamping action.

The adjusting actuator 56 is an electric motor and drives the two

conveyor belts

27, 31 and the associated vacuum boxes 62 (i.e. the entire so-called suction belt table) along or against the direction y via a helical gear mechanism 57 (so-called screw drive). The belt conveyor 28 is guided in its lateral adjustment by a linear guide 58, which linear guide 58 may have, for example, a first rail 59 and a second rail 60 parallel thereto, which first rail 59 and second rail 60 may be T-channel profiles (T-Nut-Profile).

List of reference numerals

1 printing machine

2 printing unit

3 printing unit

4 feeder

5 Stacking

6 plate changer

7 plate changer

8 printing plate

9 well

10 well

11 ground transportation device

12 bracket

13 bracket lifting device

14 loading and unloading station

15 suction head

16 first carrier

17 second carrier

18 third carrier

19 coupling transmission mechanism

20 carriage

21 rail

22 adjusting actuator

23 swing arm

24 axes of rotation

25 conveying side

26 bracket

27 first conveyor belt

28 belt conveyor

29 sheet feeding table

30 reciprocating suction device

31 second conveyor belt

32 axes

33 plane of conveyance

34 plate conveyor

35 sliding vehicle

36 traction device

37 driving wheel

38 rail system

39 upper rail section

40 horizontal rail

41 Beam

42 gripping apparatus

43 plate member

44 control curve/control cam

45 column

46 vertical rail

47 bar

48 adjustment actuator

49 shaft

50 telescopic rail guiding device

51 curved roller

52 adjusting actuator

53 orientation device

54 control device

55 sensor

56 adjusting actuator

57 helical gear transmission mechanism

58 linear guide device

59 first rail

60 second rail

61 stop piece

62 vacuum box

T direction of conveyance

In the x direction

y direction

z direction

Claims

1. An apparatus for printing plate manipulation on a printing press (1) having a first printing unit (2) and a second printing unit (3), comprising a belt conveyor (28) for printing plates (8),

it is characterized in that the preparation method is characterized in that,

the belt conveyor (28) is arranged for conveying the first printing plate (8) and the second printing plate (8) in a conveying direction (T) towards the first printing unit (2) and the second printing unit (3), and

an orientation device (53) is provided, which orients the first printing plate (8) to the first printing unit (2) and the second printing plate (8) to the second printing unit (3) in a lateral direction, transverse to the conveying direction (T).

2. The apparatus as set forth in claim 1, wherein,

it is characterized in that the preparation method is characterized in that,

the alignment device (53) has a control device (54) in which a first setpoint value for the alignment of the first printing forme (8) to the first printing unit (2) and a second setpoint value for the alignment of the second printing forme (8) to the second printing unit (3) are stored.

3. The apparatus as set forth in claim 2, wherein,

it is characterized in that the preparation method is characterized in that,

the control device (54) is connected to a sensor (55) which measures the actual values of the lateral positions of the first printing plate (8) and the second printing plate (8) and signals the control device (54).

4. The apparatus as set forth in claim 3, wherein,

it is characterized in that the preparation method is characterized in that,

the belt conveyor (28) having a first conveyor belt (27) and a second conveyor belt (31),

the second conveyor belt is swingable into a position aligned with the first conveyor belt (27) and into a position angled with respect to the first conveyor belt (27).

5. The apparatus as set forth in claim 4, wherein,

it is characterized in that the preparation method is characterized in that,

the sensor (55) is assigned to the second conveyor belt (31) for measuring the lateral position of the first printing plate (8) or the second printing plate (8) held on the second conveyor belt (31) in each case in the angled position of the second conveyor belt (31).

6. The apparatus of any one of claims 2 to 5,

it is characterized in that the preparation method is characterized in that,

the control device (54) is connected to an adjustment actuator (56) which, in the orientation, laterally advances the belt conveyor (28) in order to compensate for deviations or differences between nominal and actual conditions.

7. The apparatus as set forth in claim 6, wherein,

it is characterized in that the preparation method is characterized in that,

the adjustment actuator (56) drives the belt conveyor (28) through a helical gear transmission (57) so as to cause the belt conveyor (28) to travel laterally.

8. The apparatus of claim 6 or 7,

it is characterized in that the preparation method is characterized in that,

the belt conveyor (28) is guided by a linear guide (58) as it travels laterally.

9. The apparatus of any one of claims 6 to 8,

it is characterized in that the preparation method is characterized in that,

the belt conveyor (28) has at least one vacuum box (62) in which a negative pressure is provided for holding the first printing plate (8) and the second printing plate (8), and

the belt conveyor travels laterally along with the vacuum box (62) when oriented.

10. The apparatus as set forth in claim 1, wherein,

it is characterized in that the preparation method is characterized in that,

an adjustment actuator (56) and a linear guide (58) are provided for laterally advancing the conveyor belts (27, 31) of the belt conveyor (28) during the orientation.