DE102020110508B4 - Methods and devices for feeding flat goods to a machining process or a machining unit with precise positioning - Google Patents

Abstract

Method for feeding flat goods to a machining process in a transport plane and in a transport direction (06) with precise positioning, 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, with the flat goods being transported in a horizontal position arranged one behind the other aligned during transport, with the inclined position of the respective sheet-like good being sensed for correction of the inclined position, and a first transport device (10) during the transport of the sheet-like good held by circulating transport means (11; 12) of the first transport device (10) as a function of the sensed inclined position rotated about an axis running perpendicular to the transport plane and for lateral position correction the lateral position of the respective sheet-like good is sensed and a second transport device (20) during the transport of the rotating en means of transport (21; 22) of the second transport device (20) is shifted transversely to the transport direction (06) and for transferring a respective flat product from the first to the second transport device (10; 20) to the circulating transport means (11; 12) of the first transport device ( 10) assigned vacuum areas (16) that are connected to one another in the direction of transport (06) and can be switched independently are deactivated one after the other and/or assigned to the circulating transport means (21; 22) of the second transport device (20), that are connected to one another in the transport direction (06) and independently switchable vacuum areas (16) are activated one after the other.

Description

The invention relates to a method for supplying flat goods to a machining process with precise positioning and devices for supplying flat goods to a processing unit with precise positioning.

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 necessary 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 correction of the skew by the first transport device causes an undesired displacement of the goods transversely to the transport direction, which has to 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 10 2018 133 450 A1 discloses a device for aligning the leading edge of flat, flexible objects movable along a transport path with a transport belt for transporting the objects. Chambers are formed in the area of the conveyor belt, which can be subjected to negative pressure or positive pressure.

The invention is based on the object of creating a method for feeding sheet-like goods to a machining process with precise positioning and devices for feeding sheet-like goods with accurate positioning to a feeding frame machining unit, which enable high feeding accuracy even at high machining speeds.

The object is achieved according to the invention by the features of claim 1 and the features of claims 12, 13, 14, 15 and 16. The dependent claims relate to advantageous refinements and/or developments of the solution found.

The advantages that can be achieved with the invention consist in particular in the fact that flat goods are aligned in motion without mechanical stops, with the correction of the inclined position of a flat goods having no undesirable effect on its lateral position.

This is achieved in particular by the fact that the movement of the sheet-like material that occurs when correcting the inclined position in the area of the first transport device is corrected transversely to the transport direction. As a result, it turns out 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 sheet-like good extends transversely to its respective transport direction.

The transport device transports the flat goods preferably in each case floating as far as possible on an air cushion. In this case, the flat goods 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 sheet-like goods 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 flat goods 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. In order to transfer the flat goods from the first to the second transport device, the vacuum areas can be deactivated or activated one after the other, which in particular results in reliable guidance of the respective flat goods 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 aligning movements of the flat goods required for alignment or changes in the transport speed of the flat goods.

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 flat goods with precise positioning to a processing unit (not shown), which may be a coating machine or a printing machine or a punching machine.

The processing unit can be designed in particular for the processing of flat goods in the form of metal sheets. 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 are arranged, which have air outlet openings 18; 26, preferably Venturi nozzles 18; 26, for producing a blown air cushion which carries the sheet-like goods 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 which the blown air boxes 17; 25 are assigned on their subpages. Viewed in transport direction 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 sheet-like product 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 goods the last flat good the same transport device 30; 10; 20 can still overlap, ie if several flat goods 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 make it easier for the flat goods to be detached when the vacuum is deactivated, slight excess pressure 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 for transporting flat goods in the transport direction 06 can be driven at variable speeds. 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 rotatable bearing is preferably formed centrally in relation to the first transport device 10 . 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 includes also a drive 13, with which the displacement of the first transport device 10 can be effected 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 sheet-like product 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 good is measured via the time difference between the triggering/sensing at the front edge of the flat good being transported in each case.

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 product. 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 sheet-like good 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 product. 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 be fed to the transport device 01, in particular to its control 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 precisely positioned feeding of flat goods to a Machining process in one transport level and one transport direction 06, in particular for the precise positioning of sheet metal panels to a printing or coating unit of a sheet metal coating machine or the like, with the sheet-like goods being transported in a horizontal position arranged one behind the other and being aligned during transport.

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

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 planar good transverse to the transport direction 06 resulting from the rotation of the first transport device 10 during the transport of a respective planar good.

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

In other words, the first transport device 10 conveys the respective sheet-like material somewhat obliquely, 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 sheet-like good 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 sheet-like good is sensed and a second transport device 20 is displaced transversely to the transport direction 06 during the transport of the sheet-like good 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 sheet-like good, for example, the circulating transport means 21; 22 can be driven temporarily 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, depending on the sensed longitudinal position of a respective sheet-like item.

The correction of the longitudinal position of a respective sheet-like good can also be carried out with the further 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 creates greater distances between the front edges of successive planar goods when planar goods are provided than is required when processing the planar goods by a processing unit downstream from transport device 01, the planar goods can preferably be placed 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.

The lateral position and the longitudinal position of a respective flat product are preferably corrected simultaneously by shifting the second transport device 20 and changing the transport speed.

The flat goods 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 handing over flat goods to successive transport devices 30; 10; 20, a vacuum is applied to at least one circulating transport means 31; 32; 11; 12 of an upstream transport unit in the transport direction 06 direction 10, 30 deactivated when a vacuum on 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 sheet-like good.

This happens in particular when the flat goods 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 sheet-like good.

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 flat goods must be guaranteed. The transport of the flat goods does not take place undefined in any route area.

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

Preferably, the longitudinal position of the respective sheet-like good is sensed during the transport of the respective sheet-like good held by the second transport device 20, wherein 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 sheet-like good 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 sheet-like good is detected during the transport of the respective sheet-like good held by the second transport device 20 and the second transport device 20 is displaced transversely to the transport direction 06 depending on the sensed lateral position.

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

The inclined position of the respective sheet-like good is sensed in particular during the transport of the sheet-like good held by the first transport device 10 or during the transport of the sheet-like good held by a further transport device 30 arranged upstream of the first transport device 10 .

According to a preferred method, the flat material 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 sheet-like good 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 sheet-like product 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 sheet-like product.

Subsequently, the lateral position and the longitudinal position of the sheet-like goods are determined.

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

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03

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04

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05

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06

transport direction

07

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08

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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

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37

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38

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39

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40

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41

Sensor, first

42

sensor, second

43

sensor, third

Claims (22)

Method for feeding flat goods to a machining process in a transport plane and in a transport direction (06) with precise positioning, 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, with the flat goods being transported in a horizontal position arranged one behind the other aligned during transport, with the inclined position of the respective sheet-like good being sensed for correction of the inclined position, and a first transport device (10) during the transport of the sheet-like good held by circulating transport means (11; 12) of the first transport device (10) as a function of the sensed inclined position rotated about an axis running perpendicular to the transport plane and for lateral position correction the lateral position of the respective sheet-like good is sensed and a second transport device (20) during the transport of the rotating en means of transport (21; 22) of the second transport device (20) is shifted transversely to the transport direction (06) and for transferring a respective flat product from the first to the second transport device (10; 20) to the circulating transport means (11; 12) of the first transport device ( 10) assigned vacuum areas (16) that are connected to one another in the direction of transport (06) and can be switched independently are deactivated one after the other and/or assigned to the circulating transport means (21; 22) of the second transport device (20), that are connected to one another in the transport direction (06) and independently switchable vacuum areas (16) are activated one after the other. procedure after claim 1 , characterized in that the first transport device (10) is displaced transversely to the transport direction (06). procedure after claim 1 or 2 , characterized in that the first transport device (10) is displaced transversely to the direction of transport (06) by a distance which corresponds to the displacement of the respective planar good transverse to the transport direction resulting from the rotation of the first transport device (10) during the transport of a respective planar good (06) corresponds. procedure after claim 1 , 2 or 3 , characterized in that the inclined position of the respective sheet-like good during the transport of the first transport device (10) held sheet-like good or during the transport of one of the first Transport device (10) upstream further transport device (30) held sheet-like good is sensed. procedure after claim 1 , 2 , 3 or 4 , characterized in that the lateral position of the respective flat good is detected during the transport of the respective flat good 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 detected. procedure after claim 1 , 2 , 3 , 4 , or 5, characterized in that the longitudinal position of the respective sheet-like good is sensed during the transport of the respective sheet-like good held by the second transport device (20) and the circulating transport means (21; 22) comprised by the second transport device (20) depending on the sensed longitudinal position are temporarily driven at a higher or lower speed compared to the transport speed for transferring the flat goods to a processing unit downstream of the second transport device (20). procedure after claim 1 , 2 , 3 , 4 , 5 or 6 , 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 , 5 , 6 or 7 , characterized in that the flat goods 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 , 6 , 7 or 8th , characterized in that the planar goods 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 for a planar good to be transferred in each case vacuum on at least one circulating transport means (11; 12; 31; 31) of a transport device (10, 30) upstream in the transport direction (06) is deactivated when a vacuum on at least one circulating transport means (11; 12; 21; 22) of an in Transport direction (06) downstream transport device (10; 20) has detected the respective good. procedure after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th or 9 , 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 sheet-like good is successively deactivated or activated in areas. procedure after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th , 9 or 10 , characterized in that the sheet-like product 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 a sensing of an inclined position of the sheet-like product takes place, then in the area the rotary movement for correcting the skew and a displacement movement transverse to the transport direction (06) takes place on the first transport section, the sheet-like material 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 reduced in certain areas in the area of the first transport section and in the area of the second transport section, a vacuum is built up in some areas to hold the sheet-like material, the lateral position and the longitudinal position of the sheet-like material are then determined and then, in the event of a correction, the side ten 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 changed at times and finally the transfer to the machining process takes place at a transport speed of the machining process. Device for feeding sheet-like goods to a processing unit in a transport plane and in a transport direction (06) with precise positioning, in particular for feeding metal sheets with precise positioning to a printing or coating unit of a sheet-metal coating machine or the like, with the sheet-like goods being arranged one behind the other in a horizontal position by means of a Transport device (01) are transported and aligned during transport, in particular for carrying out the method according to one or more of the preceding Claims 1 until 11 , 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, which is downstream of the first transport device (10) in the transport direction (06), each transport device (10; 20; 30) at least has a circulating transport means (11; 12; 21; 22; 31; 32), and each transport means (11; 12; 21; 22; 31; 32) is assigned a plurality of independently switchable vacuum areas (16) and connected to the vacuum areas (16 ) a vacuum can be applied to the respective transport means (11; 12; 21; 22; 31; 32), the position and/or extent of which in the transport direction (06) depends on the switching states of the vacuum regions (16), 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 for feeding sheet-like goods to a processing unit in a transport plane and in a transport direction (06) with precise positioning, in particular for feeding metal sheets with precise positioning to a printing or coating unit of a sheet-metal coating machine or the like, with the sheet-like goods being arranged one behind the other in a horizontal position by means of a Transport device (01) are transported and aligned during transport, in particular for carrying out the method according to one or more of the preceding Claims 1 until 11 , 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, which is downstream of the first transport device (10) in the transport direction (06), each transport device (10; 20; 30) has at least one circulating transport means (11; 12; 21; 22; 31; 32), and each transport means (11; 12; 21; 22; 31; 32) is assigned a plurality of independently switchable vacuum areas (16) and with the vacuum areas (16), a vacuum can be applied to the respective transport means (11; 12; 21; 22; 31; 32), the position and/or extent of which in the transport direction (06) depends on the switching states of the vacuum areas (16), characterized in that that the suction belts (11; 12; 21; 22; 31; 32) are preferably designed as toothed belts and each have two guide grooves in the toothing, with one of the guide grooves being located in at least one play-free F guide ring is guided and the other guide groove runs over a suction rail in which vacuum areas (16) are formed. Device for feeding sheet-like goods to a processing unit in a transport plane and in a transport direction (06) with precise positioning, in particular for feeding metal sheets with precise positioning to a printing or coating unit of a sheet-metal coating machine or the like, with the sheet-like goods being arranged one behind the other in a horizontal position by means of a Transport device (01) are transported and aligned during transport, in particular for carrying out the method according to one or more of the preceding Claims 1 until 11 , 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, which is downstream of the first transport device (10) in the transport direction (06), each transport device (10; 20; 30) has at least one circulating transport means (11; 12; 21; 22; 31; 32), and each transport means (11; 12; 21; 22; 31; 32) is assigned a plurality of independently switchable vacuum areas (16) and with the vacuum areas (16), a vacuum can be applied to the respective transport means (11; 12; 21; 22; 31; 32), the position and/or extent of which in the transport direction (06) depends on the switching states of the vacuum areas (16), characterized in that 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) can be displaced transversely to the transport direction (06). Device for feeding sheet-like goods to a processing unit in a transport plane and in a transport direction (06) with precise positioning, in particular for feeding metal sheets with precise positioning to a printing or coating unit of a sheet-metal coating machine or the like, with the sheet-like goods being arranged one behind the other in a horizontal position by means of a Transport device (01) are transported and aligned during transport, in particular for carrying out the method according to one or more of the preceding Claims 1 until 11 , 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, which is downstream of the first transport device (10) in the transport direction (06), each transport device (10; 20; 30) has at least one circulating transport means (11; 12; 21; 22; 31; 32), and each transport means (11; 12; 21; 22; 31; 32) is assigned a plurality of independently switchable vacuum areas (16) and with the vacuum areas (16), a vacuum can be applied to the respective transport means (11; 12; 21; 22; 31; 32), the position and/or extent of which in the transport direction (06) depends on the switching states of the vacuum areas (16), thereby characterized in that the first transport device (10) has a bearing point with a rotational degree of freedom and a further drive (15) with which the first transport device (10) can be rotated about an axis running through the bearing point. Device for feeding sheet-like goods to a processing unit in a transport plane and in a transport direction (06) with precise positioning, in particular for feeding metal sheets with precise positioning to a printing or coating unit of a sheet-metal coating machine or the like, with the sheet-like goods being arranged one behind the other in a horizontal position by means of a Transport device (01) are transported and aligned during transport, in particular for carrying out the method according to one or more of the preceding Claims 1 until 11 , 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, which is downstream of the first transport device (10) in the transport direction (06), each transport device (10; 20; 30) has at least one circulating transport means (11; 12; 21; 22; 31; 32), and each transport means (11; 12; 21; 22; 31; 32) is assigned a plurality of independently switchable vacuum areas (16) and with the vacuum areas (16), a vacuum can be applied to the respective transport means (11; 12; 21; 22; 31; 32), the position and/or extent of which in the transport direction (06) depends on the switching states of the vacuum areas (16), characterized in that 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 s ind. device after claim 12 , 13 , 14 , 15 or 16 , characterized in that the second transport device (20) has transport means (21; 22) that can be accelerated and/or decelerated. device after claim 12 , 13 , 14 , 15 , 16 or 17 , 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/or two or three independently switchable vacuum areas (16) are assigned to each suction belt (11; 12; 21; 22; 31; 32). device after claim 12 , 13 , 14 , 15 , 16 , 17 or 18 , characterized in that the first transport device (10) is mounted such that it can rotate about an axis running perpendicularly to the transport plane and is mounted such that it can be displaced transversely to the transport direction (06) with the axis being displaced, and the second transport device (20) is mounted such that it can be displaced transversely to the transport direction (06). . device after claim 12 , 13 , 14 , 15 , 16 , 17 , 18 or 19 , 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 goods are arranged and/or in the area of the first or the second transport device (10; 20) 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 good are arranged. device after claim 12 , 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 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 or 21 .

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