DE102020110509B4 - Method and device for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine - Google Patents

Abstract

Method for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine, the metal panels being transported in a horizontal position arranged one behind the other and being aligned during transport, the inclined position of the respective flat metal panel being sensed to correct the slant and a first transport device (10 ) During the transport of the flat metal sheet held by the first transport device (10), depending on the sensed inclined position, rotated about an axis running perpendicular to the transport plane and shifted transversely to the transport direction (06) and for lateral position correction the lateral position of the respective flat metal sheet is sensed and a second Transport device (20) is displaced transversely to the transport direction (06) during the transport of the sheet metal panel held by the second transport device (20), characterized in that the first trans port device (10) is displaced by a distance transverse to the transport direction (06) which corresponds to the displacement of the respective flat metal plate transverse to the transport direction (06) resulting from the rotation of the first transport device (10) during the transport of a respective flat metal plate.

Description

The invention relates to a method and a device for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine.

The feeding of flat goods, in particular sheet metal, to a processing process, for example a painting or printing process, must be carried out in a precise position for satisfactory painting or printing results.

For this purpose, it is known to mechanically align the metal sheets by means of side marks, positioning marks, sheet stops or the like.

The metal sheets, which are transported lying one behind the other, hit the positioning marks or stops during their transport, so that the metal sheets are forced to be brought into the desired or precise position. A tilt correction can be provided for this purpose. The front edge of the sheet metal is aligned essentially at right angles to the transport direction. Furthermore, a lateral alignment of the metal sheet is provided, so that it can be fed to the machining process in the middle. Finally, an optimal longitudinal alignment of the metal sheet with regard to the transport route is necessary so that it is fed to the processing process or the processing unit at the right time.

Since the sheet metal panels are becoming increasingly thinner due to material savings and ever higher production speeds are required, damage to the panel edges can often occur with the known methods or devices, since the metal panels hit the stops or positioning marks at high speed. In particular, metal sheets with a small sheet thickness are damaged in the process.

From the DE 10 2007 031 115 A1 a device and a method for aligning panel-shaped goods are known, in which circumferential alignment stops are used.

the DE 198 14 141 C2 describes a method for feeding flat goods to a machining process in a position-accurate manner, the goods being transported in a horizontal position arranged one behind the other and being aligned during transport. The required aligning movements take place without mechanical aligning action on one or more peripheral edges of the item.

The necessary correction of the skew of the leading edge, the lateral alignment and the longitudinal alignment are carried out by two successively arranged transport devices, the first transport device only realizing the skew correction and the second transport device the lateral alignment and the longitudinal alignment.

The skew correction by the first transport device causes an undesired displacement of the goods transversely to the transport direction, which must be corrected with the second transport device.

From the DE 198 14 141 C2 is also known to realize the required correction of the skew of the leading edge, the lateral alignment and the longitudinal alignment with a single transport device.

the DE 692 07 737 T2 discloses an apparatus for handling and aligning bundles of flat objects. The device comprises two conveyor organs which can be displaced vertically in relation to one another, one consisting of a table with driven balls and the other comprising a series of separate driven rollers. The control of the conveyor organs is carried out according to the desired lateral displacement and the desired orientation that is to be given to the bundle of flat objects.

the DE 10 2017 012 279 B3 describes a sheet processing machine with a sheet separator, a sheet guiding system, an acceleration device, a first alignment device with a rotating stop and a second alignment device. A sensor that detects the position of the stop is provided for the purpose of aligning the sheets.

The invention is based on the object of creating a method and a device for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine, which enables high feeding accuracy even at high processing speeds.

The object is achieved according to the invention by the features of claim 1 and the features of claim 11 . The dependent claims relate to advantageous refinements and/or developments of the solution found.

The advantages that can be achieved with the invention are, in particular, that the alignment of sheet metal panels in motion takes place without mechanical stops, the correction of the inclined position of a sheet metal panel having no undesirable effects on its lateral position.

This is achieved in particular by the fact that the movement of the flat sheet metal plate transverse to the transport direction that occurs when correcting the inclined position in the area of the first transport device is corrected. As a result, there is a resulting conveying direction when correcting the inclined position perpendicular to the processing gap of a downstream processing unit.

The lateral position is aligned on a second transport device, which is located downstream of the first transport device. The second transport device only has to correct the lateral position to the extent that was already required before the skew correction by the first transport device.

The solution found also has the advantage that the transport device transport device is variable in width and is suitable for transporting flat goods of different widths without structural adjustments. The width of a flat sheet metal panel extends transversely to its respective transport direction.

The transport device transports the sheet metal panels, preferably floating as far as possible on an air cushion. In this case, the sheet metal panels to be transported lie only on suction belts, with the relevant suction belts being arranged in particular in pairs parallel to one another. Otherwise, the flat sheet metal panels have no direct physical contact, e.g. B. to stationary in their transport plane arranged blast air boxes. Due to this configuration, a largely friction-free and/or slip-free transport of the sheet metal panels is possible.

The first and the second transport device can each have circulating transport means and associated vacuum areas that can be switched independently of one another. To transfer the sheet metal panels from the first to the second transport device, the vacuum areas can be deactivated or activated one after the other, which in particular ensures reliable guidance of the respective sheet metal panels in connection with the possibility of aligning them, with the transport device having a small extension in the transport direction.

This proves to be advantageous in particular in connection with the rapid alignment movements of the sheet metal panels required for alignment or changes in the transport speed of the sheet metal panels.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

• 1 eine erste Ansicht der Transportvorrichtung in dreidimensionaler Darstellung von oben;
• 2 eine zweite Ansicht der Transportvorrichtung in dreidimensionaler Darstellung von unten;
• 3 eine Draufsicht der Transportvorrichtung;
• 4 eine Draufsicht der Transportvorrichtung gemäß 3 im Teilschnitt;
• 5 eine Seitenansicht der Transportvorrichtung zu 3 und 4.

Show it:

• 1 a first view of the transport device in three-dimensional representation from above;
• 2 a second view of the transport device in three-dimensional representation from below;
• 3 a plan view of the transport device;
• 4 a plan view of the transport device according to FIG 3 in partial cut;
• 5 a side view of the transport device 3 and 4 .

1 shows a transport device 01 for feeding sheet metal panels with precise positioning to a processing unit (not shown), which may be a painting machine or a printing machine or a punching machine.

The processing unit can be designed in particular for the processing of flat sheet metal panels. The processing unit is located downstream of the transport device 01 in the transport direction 06 .

The transport device 01 comprises a first transport device 10 and a second transport device 20 downstream of the first transport device 10 in the transport direction 06. A separating device, not shown here, also referred to as a feeder, can be arranged upstream of the transport device 01. The transport device 01 can also include a further transport device 30, which is arranged upstream of the first transport device 10 in the transport direction 06.

In the area of the first transport device 10 and/or the second transport device 20 and/or the further transport device 30, blast air boxes 17; 25; 17 arranged, the air outlet openings 18; 26, preferably Venturi nozzles 18; 26, for generating a blown air cushion that supports the sheet metal panels without contact. The blast air boxes 17; 25 are outside the transport devices 10; 30; 20 trained. The blown air for generating the blown air cushion is preferably generated by fans 34, the blast air boxes 17; 25 are assigned on their subpages. Viewed in the direction of transport 06, the further transport device 30, the first transport device 10 and the second transport device 20 are connected in series, so that a transfer of a respective flat metal sheet from a transport device 30; 10; 20 to the next is easily possible.

The first and the second transport device 10; 20 and preferably also the further transport device 30 have circulating transport means 11; 12; 21; 22; 31; 32, preferably as a suction belt 11; 12; 21; 22; 31; 32 are formed. The suction belt 11; 12; 21; 22; 31; 32 are preferably toothed belts and have two guide grooves in the teeth. In one guide groove, which is preferably eccentric, a guide ring is guided without play on the toothed disks, in the other guide groove, which is preferably central, a suction rail runs with play in the upper area, through which the vacuum is applied. In the middle, the suction straps have 11; 12; 21; 22; 31; 32 vacuum holes. The back of the belt is equipped with suction pockets to increase the suction area.

Preferably, the transport devices 10; 20; 30 in each case two mutually parallel circumferential suction belts 11; 12; 21; 22; 31; 32 on. More preferred are individual or each suction belt 11; 12; 21; 22; 31; 32 assigned two or three independently switchable vacuum areas 16. The vacuum regions 16 can be designed as chambers, with each of the chambers being able to be assigned a switchable valve, with which the respective chamber can be alternately connected to a vacuum source or separated from the vacuum source as required.

The vacuum is preferably switched via 2/3-way valves. The vacuum areas 16 of a respective transport device 10; 20; 30 preferably adjoin one another, viewed in the direction of transport 06.

If in the action of a transport device 10; 20; 30 with the flat metal sheets the last flat metal sheet the same transport device 30; 10; 20 can still overlap, ie if several sheet metal panels in the area of a respective transport device 30; 10; 20 are, the vacuum must be in several areas within a transport device 30; 10; 20 can be controlled separately. In order to facilitate detachment of the sheet metal panels when deactivating the vacuum, a slight overpressure can be applied to the system, in particular to the vacuum areas 16 . The valve then switches between vacuum and slight overpressure.

In particular, the first transport device 10 and the second transport device 20 and a further transport device 30 can each have two suction belts 11; 12; 21; 22; 31; 32 include and the track width of the suction belt 11; 12 of the first transport device 10 to be greater than the track width of the suction belt 21; 22; 31; 32 of the second transport device 20 and/or the further transport device 30.

The different gauges of the suction belt 11; 12; 21; 22; 31; 32 of the transport devices 10; 20; 30 overlap viewed in the transport direction 06. The overlap is preferably in the range of 10 percent of the extent of the respective suction belts 11; 12; 21; 22; 31; 32 in transport direction 06.

The means of transport 11; 12; 21; 22; 31; 32, in particular the suction belts 11; 12; 21; 22; 31; 32 are paired by means of transport drives 19; 27; 33 revolving driven. Preferably, each transport device 10; 20; 30 one of the other transport drives 19; 27, 33 independent means of transport drive 19; 27; 33 on. The suction belt 11; 12; 21; 22; 31; 32 of a pair of belts of a transport device 10; 20; 30 can also have a common drive shaft by a transport means drive designed as a servo motor 19; 27; 33 are driven. Preferably, the suction belts 21; 22; 31; 32 of the second and the further transport device 20; 30 by the respective means of transport drives 27; 33 can be driven at variable speeds in the direction of transport 06 for transporting sheet metal panels. In particular, the second transport device 20 has transport means 21 that can be accelerated and/or decelerated. 22 in the form of suction belts 21; 22 on. This means that the suction belts 21; 22 can be driven at a speed that is equal to, greater than or less than a transport speed of the processing unit.

The first transport device 10 is designed to implement a skew correction. For this purpose, the first transport device 10 is rotatable about an axis running perpendicularly to the transport plane and is mounted such that it can be displaced transversely to the transport direction 06 by shifting the axis. The rotatable mounting of the first transport device 10 can be implemented by forming a bearing point, for example a turntable, with a rotational degree of freedom. The pivot bearing is preferably central with respect to the first Transport device 10 formed. The first transport device 10 also has a drive 15 with which the first transport device 10 can be rotated about an axis running through the bearing point. The axis preferably runs perpendicular to the transport plane. The drive 15 can be formed by an electromechanical cylinder 15 which acts on the first transport device 10 or parts thereof via a lever.

In addition to the rotatable mounting via the rotatable bearing point, the first transport device 10 is also mounted so that it can be displaced transversely to the transport direction 06. For this purpose, the first transport device 10 preferably has a linear guide 14 . The first transport device 10 also includes a drive 13, with which the first transport device 10 can be displaced transversely to the transport direction 06 via the linear guide 14. The drives 13; 15 can be controlled independently of one another.

The second transport device 20 is designed to implement a lateral position correction and is preferably mounted so that it can be displaced only transversely to the transport direction 06.

The structural design of the bearing means and drive means for realizing the displaceability transversely to the transport direction 06 is the same for the first and the second transport device 10; 20 preferably identical.

Correspondingly, the second transport device 20 has a linear guide 24 and a drive 23, with which the second transport device 20 can be displaced on the linear guide 24 transversely to the transport direction 06.

In contrast to the first and second transport device 10; 20, the further transport device 30 is mounted rigidly in the frame. The drives 13; 23 for transverse displacement as servomotors 13; 23 be trained.

With regard to the storage of the individual transport devices 10; 20; 30, in particular with regard to their relocatability, the transport devices 10; 20; 30 each as units with respective means of transport drives 19; 27; 33 taken. In other words, in cases where a transport device 10; 20 also always the associated means of transport drive 19; 27 relocatable.

Preferably, all transport devices 10; 20; 30 mounted on a common frame. The frame is firmly connected to the processing unit, for example a painting machine.

First, second and third sensors 41; 42; 43 formed and in the area of the transport devices 10; 20; 30 arranged.

First sensors 41 for detecting the inclined position of a respective flat sheet metal panel are preferably arranged in transport direction 06 upstream of the first transport device 10 and/or in the area of the first transport device 10 and/or in the area of a further transport device 30. In particular, first sensors 41 can be embodied as two laser light barriers or reflection laser light barriers arranged spaced apart from one another transversely to transport direction 06 .

The first two sensors 41 are preferably designed to sense very quickly and are arranged at the same height in the direction of transport 06 and at a defined distance transversely to the direction of transport 06. The distance is preferably 620 mm. With the first sensors 41, the oblique angle of the respective flat metal sheet is measured via the time difference of the triggering/sensing at the front edge of the respectively transported flat metal sheet.

In the area of the first or the second transport device 10; 20, at least one second sensor 42 can be arranged to detect the lateral position of a respective flat metal sheet. Two second sensors 42 are preferably formed and are each assigned to one of the two side areas of the transport path. With the arrangement of two second sensors 42, one of the two side edges of the respective flat sheet metal panel can be sensed. The or all of the second sensors 42 can be embodied as sensors 42 that extend transversely to the direction of transport 06 or can be displaced transversely to the direction of transport 06. The use of line sensors or laser line sensors is advantageous.

In the area of the first or second or further transport device 10; 20; 30, at least one third sensor 43 can be arranged to detect the longitudinal position of a respective flat metal sheet. The at least one third sensor 43 is preferably designed as a laser light barrier.

In addition to the described sensors 41; 42; 43 for position detection, there can also be sensors for checking the sheet movement and for measuring the vacuum level. It goes without saying that all movements and position corrections must be made in coordination with a respective system angle, for example of the processing unit. This system angle can Transport device 01, in particular its control, is supplied in the form of an electronic master axis. An angular position sensor can also be provided for detecting the system angle.

The transport device 01 can be used to carry out a method that is described below. The method is not limited to the use of the transport device 01 described.

In connection with the description of the invention, the terms alignment of the edge or alignment of the position are understood synonymously with correction of the edge position or correction of the position.

In the method for feeding sheet metal panels with precise positioning to a machining process in a transport plane and a transport direction 06, in particular for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine or the like, the flat sheet metal panels are transported in a horizontal position arranged one behind the other and aligned during transport.

To correct the inclined position, the inclined position of the respective flat metal sheet is sensed and a first transport device 10 is rotated during the transport of the flat metal plate held by the first transport device 10, depending on the sensed inclined position, about an axis running perpendicular to the transport plane and displaced transversely to the transport direction 06.

The first transport device 10 is preferably displaced transversely to the transport direction 06 by a distance that corresponds to the displacement of the respective flat metal sheet transverse to the transport direction 06 resulting from the rotation of the first transport device 10 during the transport of a respective flat metal sheet.

The shift corrects a lateral position error that results exclusively from the rotation and the superimposed further transport of a respective flat metal sheet, for example by the suction belts 11, 12 during the twisting.

In other words, the first transport device 10 conveys the respective flat metal sheet at a slight angle, depending on the case, which is corrected by moving the first transport unit 10 transversely to the transport direction 06. The speed of the transverse movement is dependent on the twisting angle. The resulting conveying direction of the respective flat metal sheet is perpendicular to the processing gap, in particular the lacquer gap, of a processing unit.

The displacement of the first transport unit 10 transversely to the transport direction 06 preferably takes place as a function of the rotary deflection of the transport unit 10. The speed of the transverse movement depends linearly on the angle of the rotary movement.

To correct the lateral position, the lateral position of the respective flat metal sheet is sensed and a second transport device 20 is displaced transversely to the transport direction 06 during the transport of the flat metal sheet held by the second transport device 20 .

In principle, the lateral position correction can take place before or after the skew correction, so that the second transport unit 20 could also be arranged in front of the first transport unit 10 .

To correct the longitudinal position of a respective flat metal sheet, for example, the circulating transport means 21; 22 can be driven at times, depending on the sensed longitudinal position of a respective flat metal sheet, at a speed that is increased or reduced in relation to the transport speed of a processing unit downstream of the second transport device 20 .

The correction of the longitudinal position of a respective flat sheet metal panel can also be carried out with the additional transport device 30 . Likewise, a two-stage correction of the longitudinal position using further and second transport device 30; 20 possible. In any case, the transfer to the machining process must take place at a transport speed of the machining process or the machining machine.

If a feeder is configured upstream of transport device 01, which, when sheet metal panels are provided, creates larger distances between the front edges of successive sheet metal panels than is required when processing the sheet metal panels by a processing unit downstream of transport device 01, the sheet metal panels can preferably be fed on the further and/or the second transport device 30; 20 are braked. This can be done in superimposition to the longitudinal correction.

This condition is also referred to as driving the feeder with a different format than the processing unit.

Preferably, the lateral position and the longitudinal position of a respective flat metal sheet are corrected simultaneously by shifting the second transport device 20 and changing the transport speed.

The flat sheet metal panels are during the transport of the first transport device 10 and / or the second transport device 20 or each transport device 10; 20; 30 held by vacuum.

When transferring sheet metal panels to successive transport devices 30; 10; 20, a vacuum is applied to at least one circulating transport means 31; 32; 11; 12 of a transport device 10, 30 upstream in the transport direction 06 is deactivated when a vacuum is applied to at least one circulating transport means 11; 12; 21; 22 of a downstream transport device 10 in the transport direction 06; 20 has captured the respective planar metal sheet.

This happens in particular when the sheet metal panels are transferred from the first transport device 10 to the second transport device 20 and/or from the further transport device 30 to the first transport device 10.

If the first transport device 10 and/or the second transport device 20 and/or each transport device 10; 20; 30 vacuum areas 16 that adjoin one another in the direction of transport 06, their vacuum is successively deactivated or activated in areas during the transfer and/or acceptance of a respective flat metal sheet.

When activating and deactivating the vacuum of the transport devices 30; 10; 20 or the activation and deactivation of the vacuum areas 16 of the transport devices 30; 10; 20, a continuous fixation of the respective sheet metal panel must be guaranteed. The transport of the sheet metal panels is not undefined in any path area.

As soon as a transport device 30; 10; 20 has released a respective sheet metal panel after deactivation of the vacuum, the position and rotational speed of the suction belts 31; 32; 11; 12; 21; 22 reset again. The respective flat metal sheet can still be in the area of the respective transport device 30; 10; 20 located.

Preferably, the longitudinal position of the respective sheet-like sheet metal panel is sensed during the transport of the respective sheet-like sheet metal panel held by the second transport device 20, whereby sensing quite generally means detecting with a sensor 41; 42; 43 is understood.

The third sensor 43 provided for sensing the longitudinal position of the respective flat sheet metal panel is preferably located in the middle and measures the position of the front edge by determining the longitudinal difference, ie the deviation from the system angle.

Preferably, the lateral position of the respective flat metal sheet is detected during the transport of the respective flat metal sheet held by the second transport device 20 and the second transport device 20 is displaced transversely to the transport direction 06 depending on the lateral position sensed.

More preferably, the lateral position and the longitudinal position are sensed simultaneously.

The inclined position of the respective sheet metal plate is sensed in particular during the transport of the sheet metal plate held by the first transport device 10 or during the transport of the sheet metal plate held by another transport device 30 arranged upstream of the first transport device 10 .

According to a preferred method, the flat metal sheet is sucked in by means of a vacuum and held on a first transport section along the first transport device 10 . In the area in front of the first transport section or in the area of the first transport section, an inclined position of the flat metal sheet is sensed.

Then, in the area of the first transport section, the rotary movement for the correction of the skew and a shifting movement transverse to the transport direction 06 are carried out.

The flat metal sheet is then transferred from the first transport section 10 to a second transport section along the second transport device 20 and the vacuum is released in the area of the first transport section and a vacuum is built up in the area of the second transport section to hold the flat metal sheet.

The determination of the lateral position and the longitudinal position of the two-dimensional metal sheet is then carried out.

In the case of a necessary correction of the lateral and/or longitudinal position, the lateral movement is carried out in the area of the second transport section and/or the transport speed in the area of the second transport section is temporarily changed. This is followed by the transfer to the machining process with a transport speed of the machining process.

Reference List

01

transport device

02

-

03

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04

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05

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06

transport direction

07

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08

-

09

-

10

Transport device, first

11

Means of transport, suction belts, circulating (10)

12

Means of transport, suction belts, circulating (10)

13

drive, servo motor

14

linear guide

15

Drive, cylinder, electromechanical

16

vacuum area

17

Air blast box (10; 30)

18

Air outlet opening, Venturi nozzles

19

means of transport drive

20

Transport device, second

21

Means of transport, suction belts, circulating (20)

22

Means of transport, suction belts, circulating (20)

23

drive, servo motor

24

linear guide

25

air blast box (20)

26

Air outlet opening, Venturi nozzles

27

means of transport drive

28

-

29

-

30

transport device, others

31

Means of transport, suction belts, circulating (30)

32

Means of transport, suction belts, circulating (30)

33

means of transport drive

34

fan

35

-

36

-

37

-

38

-

39

-

40

-

41

Sensor, first

42

sensor, second

43

sensor, third

Claims (22)

Method for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine, the metal panels being transported in a horizontal position arranged one behind the other and being aligned during transport, the inclined position of the respective flat metal panel being sensed to correct the slant and a first transport device (10 ) During the transport of the flat metal sheet held by the first transport device (10), depending on the sensed inclined position, rotated about an axis running perpendicular to the transport plane and shifted transversely to the transport direction (06) and for lateral position correction the lateral position of the respective flat metal sheet is sensed and a second Transport device (20) during the transport of the second transport device (20) held sheet metal plate is displaced transversely to the transport direction (06), characterized in that the first Tran sports facility (10) is displaced by a distance transverse to the transport direction (06), which corresponds to the displacement of the respective flat metal plate transverse to the transport direction (06) resulting from the rotation of the first transport device (10) during the transport of a respective flat metal plate. procedure after claim 1 , characterized in that the inclined position of the respective sheet metal plate during transport of the first transport device (10) held sheet metal plate or during transport of the further transport device (30) held upstream of the first transport device (10) is sensed. procedure after claim 1 or 2 , characterized in that the lateral position of the respective flat metal sheet is detected during the transport of the respective flat metal sheet held by the second transport device (20) and the second transport device (20) is displaced transversely to the transport direction (06) depending on the lateral position sensed. procedure after claim 1 , 2 or 3 , characterized in that the longitudinal position of the respective metal plate is sensed during the transport of the respective metal plate held by the second transport device (20) and the circulating transport means (21; 22) comprised by the second transport device (20) are temporarily equipped with a can be driven at a higher or lower speed than the transport speed for transferring the sheet metal panels to a processing unit downstream of the second transport device (20). procedure after claim 1 , 2 , 3 or 4 , characterized in that the lateral position and the longitudinal position are sensed simultaneously and/or the lateral position and the longitudinal position are corrected simultaneously by shifting the second transport device (20) and changing the transport speed. procedure after claim 1 , 2 , 3 , 4 or 5 , characterized in that the flat sheet metal panels are held by vacuum during transport by the first transport device (10) and/or the second transport device (20) or each transport device (10; 20; 30). procedure after claim 1 , 2 , 3 , 4 , 5 or 6 , characterized in that the sheet metal panels are transferred from the first transport device (10) to the second transport device (20) and/or from the further transport device (30) to the first transport device (10) and a vacuum is applied for each transported sheet metal panel on at least one circulating transport means (11; 12; 31; 32) of a transport device (10; 30) upstream in the transport direction (06) is deactivated when a vacuum is applied to at least one circulating transport means (11; 12; 21; 22) of one in the transport direction (06) downstream transport device (10; 20) has grasped the respective flat metal sheet. procedure after claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , characterized in that the first transport device (10) and/or the second transport device (20) and/or each transport device (10; 20; 30) each have vacuum regions (16) adjoining one another in the transport direction (06) and their vacuum at the handover and / or when taking over a respective flat sheet metal panel is successively deactivated or activated in areas. procedure after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 or 8th , characterized in that a respective flat metal plate is pre-aligned by the further transport device (30) with respect to its longitudinal position. procedure after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th or 9 , characterized in that the flat metal sheet is sucked in by means of a vacuum and held on a first transport section along the first transport device (10), in the area in front of the first transport section or in the area of the first transport section an inclined position of the flat metal sheet is sensed, then in the area the rotary movement for correcting the skew and a shifting movement transverse to the transport direction (06) takes place on the first transport section, the flat metal sheet is then transferred from the first transport section to a second transport section along the second transport device (20) and at the same time the vacuum is released in the area of the first transport section and In the area of the second transport section, a vacuum is built up to hold the flat metal sheet, the lateral position and the longitudinal position of the flat metal sheet are then determined and then, in the event of a correction of the S Lateral and/or longitudinal position, the lateral movement is carried out in the area of the second transport section and/or the transport speed in the area of the second transport section is temporarily changed and finally the transfer to the processing process takes place at a transport speed of the processing process. Device for feeding sheet metal panels with precise positioning to a printing or coating unit of a sheet metal coating machine, the sheet metal panels being arranged one behind the other in a lying position and being transported by means of a transport device (01) and aligned during transport, for carrying out the method according to one or more of the preceding ones Claims 1 until 10 , wherein the transport device (01) has a first transport device (10) for a skew correction and a second transport device (20) for a lateral position correction, wherein the first transport device (10) is rotatable about an axis running perpendicular to the transport plane and is mounted such that it can be displaced with displacement of the axis transverse to the transport direction (06), and the second transport device (20) is arranged downstream of the first transport device (10) in the transport direction (06) and transverse to the transport direction (06) is slidably mounted. device after claim 11 , characterized in that the second transport device (20) has transport means (21; 22) that can be accelerated and/or decelerated. device after claim 11 or 12 , characterized in that the first transport device (10) is preceded by a further transport device (30) seen in the transport direction (06). device after claim 11 , 12 or 13 , characterized in that the first transport device (10) and/or the second transport device (20) and/or a further transport device (30) each have two parallel circulating suction belts ( 11; 12; 21; 22; 31; 32) and each suction belt (11; 12; 21; 22; 31; 32) is assigned two or three independently switchable vacuum areas (16). device after claim 11 , 12 , 13 or 14 , characterized in that the first transport device (10) and the second transport device (20) and a further transport device (30) each comprise two parallel revolving suction belts (11; 12; 21; 22; 31; 32) and the track width of the suction belts ( 11; 12) of the first transport device (10) is greater than the track width of the suction belts (21; 22; 31; 32) of the second transport device (20) and/or the further transport device (30). Device according to claim 112, 12 , 13 , 14 or 15 , characterized in that the first transport device (10) and/or the second transport device (20) each have a linear guide (14; 24) and a drive (13; 23) with which the respective transport device (10; 20) on the respective linear guide (14; 24) is displaceable transversely to the transport direction (06). device after claim 11 , 12 , 13 , 14 , 15 or 16 , characterized in that the first transport device (10) has a bearing point with a rotary degree of freedom and a further drive (15) with which the first transport device (10) is rotatable about an axis running through the bearing point. device after claim 11 , 12 , 13 , 14 , 15 , 16 or 17 , characterized in that in the area of the first transport device (10) and/or the second transport device (20) and/or a further transport device (30) blast air boxes (25; 17) with Venturi nozzles (18; 26) are arranged in a stationary manner. device after claim 11 , 12 , 13 , 14 , 15 , 16 , 17 or 18 , characterized in that in the transport direction (06) in front of the first transport device (10) and/or in the area of the first transport device (10) and/or in the area of a further transport device (30), first sensors (41) for detecting the inclined position of a respective flat sheet metal are arranged. device after claim 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 or 19 , characterized in that at least one second sensor (42) for detecting the lateral position and/or at least one third sensor (43) for detecting the longitudinal position of a respective flat metal sheet is arranged in the area of the first or the second transport device (10; 20). device after claim 11 , 11 , 13 , 14 , 15 , 16 , 17 , 18 , 19 or 20 , characterized in that first sensors (41) are designed as laser light barriers or reflection laser light barriers spaced apart from one another transversely to the transport direction (06) and/or at least one second sensor (42) as a sensor that extends transversely to the transport direction (06) and/or transversely to the transport direction (06) displaceable line sensor or laser line sensor is designed and/or at least one third sensor (43) is designed as a laser light barrier. Printing machine, varnishing machine or punching machine with a device claim 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 or 21 .

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