DE102010027119A1 - Method and device for positioning sheets - Google Patents

Abstract

The invention relates to a method for positioning sheets (6) for subsequent processing in a sheet processing machine (1000) and a device (100) therefor. The positioning is done without the use of front or side stops. The sheet (6) is roughly positioned in the circumferential and oblique direction by controlled stopping of the sheet (6), side alignment takes place in the area of a feed table (16), fine positioning in the circumferential and oblique direction is carried out by positioning register stops (713, 714) of a sheet transport system (7).

Description

The invention relates to a method for positioning sheets with the features of claim 1 as well as an apparatus for positioning sheets according to the preamble of claim 7.

State of the art

As punching the cutting is referred to with closed geometric blank forms that can be circular, oval or polygonal and imaginary shapes of all kinds. Also the practices practiced in print finishing, such as punching with punch, corner punching and register punching are counted to this area. The punching takes place against a punching pad or against stamp, in some cases it is also shearing operations. Packaging materials made of paper, cardboard, cardboard or corrugated board are mainly punched in sheet format. When punching but also creasing lines or blind embossing can be introduced into the benefit.

This complex process makes it indispensable to punch the sheets individually. Since the end products are sophisticated packaging in terms of technical and graphic design (such as packaging for cosmetics, cigarettes, pharmacy, food, etc.), special requirements are not only placed on the packaging materials themselves, but are also punching tools for optimum results required with the smallest tolerances and extremely precise and reliable punching machines. Flatbed punching best meets these demands. The printed sheets stacked on a pallet are fed to the punching machine. In the machine, the sheets to be punched are precisely aligned in an alignment device, taken over by a gripper carriage and positioned exactly in the punching device between a fixed undercounter and a vertical over a knee lever or eccentric upper table.

In known sheet punching and embossing machines, which are used for punching, breaking, stamping and depositing sheets of paper, cardboard and the like, it is known to move the sheets by means of gripper carriage through the individual stations of the machine. Grippers are attached to the gripper carriage, gripping the arches at a front end, the gripper carriages themselves being moved through the machine on endless chains. This type of movement of the sheets through the machine enables continuous operation in the individual successively arranged stations of the machine.

Such a flat bed punch is for example from the DE 30 44 083 A1 known. The two tables are equipped with cutting and scoring tools or corresponding counter tools with which punched out of the cyclically guided between the table surface sheets the benefits and at the same time pressed the necessary for clean folding grooves. In the subsequent breakout the waste is removed by machine tools. Depending on the equipment of the machine finally the punched benefits can be separated in a designated Nutzentrenneinrichtung.

In order to achieve a high product quality of the punched sheets, it is necessary that the sheets and tools are precisely aligned with each other. In the punching station of a sheet punching and embossing machine, the punching tool and punched riddle plate must be brought to an exact position in the circumferential direction. It must also be ensured that both tools are directly perpendicular to the sheet transport direction without skewing. This reference position is called "first knife". In the subsequent processing stations, the tools must be adjusted relative to the position of the first knife, such. B. the stripping board in the breaker and the Nutzentrenngitter in the Nutzentrennstation. The tools must be set in their three degrees of freedom. During operation of the sheet punching and embossing machine, it may be necessary to readjust the position of the tools in the punching station. The tools in the subsequent processing stations must also be readjusted to bring them back into the correct position relative to the "first knife". The terms "aligning", "positioning" and "correcting the position" of an arc are used interchangeably below.

This elaborate adjustment work of the tools ensures that the sheets are processed accurately. The register describes the positional accuracy of the printed image at the cutting, creasing and breaking edges of the sheet. A distinction is made between circumferential grip, d. H. the positional accuracy in the machine direction and side registration, d. H. the positional accuracy transverse to the machine direction.

A disadvantage of the register-accurate alignment according to the prior art is that due to the high set-up times, ie. H. due to the high time required for the adjustment of the tools, the machine productivity is impaired.

From the prior art various measuring devices are known, which are preceded by the accurate register alignment of a sheet:
The DE OS 25 20 232 describes a device for transferring sheets to a sheet processing machine. In this case, in the area of a feed table, a mark printed on the sheet, a so-called print mark, or a side edge of the sheet is detected by sensors and the feed table is moved transversely to the sheet transport direction so that the sheet in its correct, side-facing position to the sheet transport system of the sheet processing machine can be handed over.

The DE 693 14 155 T2 describes a method for monitoring moving web material, wherein the edges of the web are detected by sensors.

The DE 202 16 042 U1 shows a device for detecting the edges of sheets in sheet-processing machines. The device comprises a line sensor, which is connected to an evaluation unit, and in which the sheet position is calculated from the signal of the sensor.

Also from the DE 101 36 870 A1 A device for detecting the position of an edge of a sheet in a printing machine emerges. In the feeder table of the printing press, a scanner line is embedded, this scanner line being associated with a reflector located above the feeder table. Similar facilities also go out of the DE 101 36 871 A1 , of the DE 101 36 872 A1 , of the DE 101 36 873 A1 , of the DE 101 36 874 A1 , of the EP 1 300 353 A2 and the EP 1 300 354 A2 out.

The DE 10 2008 012 775 A1 relates to a method for measuring the position of a sheet in the feeder of a printing or post-processing machine, wherein the measurement of the position of the sheet on the measurement of the position of the sheet leading edge or the location of printed on the sheet marks by means of a sensor. Furthermore, the invention relates to a method for aligning the sheet based on the measurement results.

The EP 1 518 803 B1 describes a positioning device for sheets in the feeder of a sheet-processing machine. The alignment in the circumferential direction via front stops and in side orientation by a controlled puller rail based on the measurement results of a target-actual position comparison by means of sensors.

task

The object of the present invention is to develop the state of the art and to describe a method for positioning sheets as well as a device for carrying out the method, wherein an exact positioning with high reliability is ensured and the device has a robust construction.

This object is achieved by a method having the features of claim 1 and by a device having the characterizing features of claim 7:
The positioning takes place without the use of front or side stops. A rough positioning of the sheet ( 6 ) in the circumferential and oblique directions takes place by a controlled stopping of the sheet ( 6 ), a page orientation takes place in the region of a feed table ( 16 ), a fine positioning in the circumferential and oblique directions is carried out by a positioning of Passeranschläge ( 713 . 714 ) of a sheet transport system ( 7 ).

The inventive method for positioning sheets for subsequent processing in a sheet-processing machine has the following steps: In a first step, sheets of paper, cardboard, plastic and the like, for. B. fed from a sheet feeder via a feed table. By acting on a respective sheet transport and pressing the sheet is transported in the next step. This is followed by a measurement of the position of the sheet leading edge of the sheet in motion. The measurement can either be done before the sheet is transported by the transport and pressing device or after the sheet is transported by the transport and pressing device. Based on the measured sheet position in the next step, the required correction movement is determined both in the circumferential direction and in oblique direction to the sheet transport direction of the sheet, for which the deviation of the arc in the circumferential and oblique directions is determined by the target position. Next, the alignment of the sheet in the circumferential and oblique direction to the sheet transport direction by a corresponding control of the transport and pressing device takes place. After completion of this alignment movement of the sheet is stopped by the transport and pressing device, that is braked to zero speed. After the sheet is at rest and clamped by means of a clamping device, in the next step, a measurement of the position of the sheet in the transverse direction to the sheet transport direction. In addition, there is still a measurement of the position of the sheet in the circumferential direction and oblique direction to the sheet transport direction. Based on the measurement results, on the one hand, the required correction movement in the transverse direction and, on the other hand, the required correction movement in the circumferential and oblique directions are determined. This is done by determining the deviation between the measured actual position and the intended target position. The bow is then aligned transversely and undergoes the required Correction movement in the transverse direction to the sheet transport direction by a movement of the clamping device. In a next step, which can alternatively take place at the same time for aligning the sheet in the transverse direction, a gripper device is positioned at least in the circumferential and oblique directions to realize the required correction movement in the circumferential and oblique directions to the sheet transport direction. While the orientation of the sheet in the circumferential and oblique directions by the transport and pressing device can be considered as a coarse direction, the positioning of the gripper device constitutes a fine alignment. In a final step, the sheet is transferred from the clamping device to the positioned gripper device, while the Gripper device is located in a sheet transfer position. The precisely positioned in this way sheet can then by the gripper device for processing the sheet by a sheet-processing machine such. As a sheet-fed press or a sheet punching machine to be transported.

In an advantageous development of the positioning method according to the invention, the measurement of the position of the sheet in the transverse direction is carried out simultaneously for measuring the position of the sheet in the circumferential direction and oblique direction. Also or alternatively, the alignment of the sheet in the transverse direction by the movement of the clamping device and the positioning of the gripper device also takes place simultaneously. Thereby, the positioning of a respective sheet can be advantageously accelerated and the aligned sheets can be fed at high clock frequency of a subsequent sheet-processing machine, which can be operated with high productivity.

Another advantageous development of the method for positioning relates to the measurement of the sheet positions: Thus, in the above-mentioned method steps in which a measurement of the sheet position takes place, either a measurement of sheet edges or of a printed image applied to the sheet or of the sheet applied print marks done. In addition to this alternative measurement can also be a combined measurement in any combination, ie z. B. a measurement of sheet edge and print image or a measurement of sheet edge and print marks. It is also possible to provide a different type of measurement for a particular surveying operation. For example, the first measurement, which serves for coarse positioning in the circumferential and / or oblique directions, can be made by measuring the position of the sheet leading edge, while the subsequent measurements, while the sheet is at rest, are made by measuring the printed image.

In an alternative and simplified embodiment of the method according to the invention for positioning sheets, fine positioning in the circumferential direction and oblique direction is dispensed with. This is particularly useful when the product to be produced is not subject to high accuracy requirements, for example in the processing of corrugated board.

The invention also relates to a device for positioning sheets of paper, cardboard, plastic and the like for subsequent processing in a sheet-processing machine, such as a sheet-fed press or a sheet punching machine, by means of which the above-described method for positioning of sheets is feasible. According to the invention, the device has no leading edge stop. It has at least two parallel to each other in the region of a feed plane arranged pressing elements, which constitute a transport and pressing device for the first alignment of the sheet in the circumferential and oblique directions. The gripper device is designed as a gripper carriage with grippers attached to a gripper bar. In a first embodiment, a respective pressing element is designed as a pair of rollers with at least one driven roller. In a second alternative embodiment, a respective pressing element is designed as a driven roller, which is employed against a, located in the sheet transport plane support surface.

In an advantageous embodiment of the device according to the invention, the clamping device, which serves to align the sheet in the transverse direction, designed as a transversely displaceable to the sheet transport direction drawing rail executed against it employed at least two rollers. In an alternative embodiment, the clamping device may be formed by at least two pairs of rollers, wherein at least one roller of a respective pair of rollers is driven. In a further embodiment, the clamping device is designed as a transversely displaceable squeegee.

In an advantageous development of the device according to the invention has these Passeranschläge, which are associated with a respective end of the gripper bar, for accurate register alignment of a gripper carriage in the sheet transfer position. A respective Passeranschlag is connected to a controllable drive, for adjusting the Passeranschlags. Such Passeranschläge are in the EP 1 371 588 B1 to which reference is hereby made in full and which is made the subject of this description.

The invention described and the described advantageous developments of Invention also represent in any combination with each other advantageous developments of the invention.

With regard to further advantageous embodiments of the invention, reference is made to the dependent claims and the description of embodiments with reference to the accompanying drawings.

embodiment

The invention will be explained in more detail with reference to exemplary embodiments. It show in a schematic representation

1 a flatbed sheet punching and / or embossing machine

2a -D the process of sheet alignment in a plan view

3a -D the process of sheet orientation in a view

4a -B alternative embodiments of the transport and pressing device

5a C alternative embodiments of the clamping device

6 alternative measuring methods for determining the position of an arc

In 1 is the basic structure of a sheet punching and embossing machine 1000 shown for punching, breaking, depaneling and storing sheets of paper, cardboard and the like. The punching and embossing machine 1000 owns a feeder 1 , a punching station 2 , a breakout station 3 and a boom 4 coming from a common machine body 5 be worn and enclosed. From one side, the so-called operator side, are the processing stations 2 . 3 . 4 accessible; on the opposite side, the so-called drive side, is the drive train of the sheet punching and embossing machine 1000 ,

The bows 6 be through an investor 1 isolated from a stack, aligned (see 2 - 5 ), the sheet transport system 7 supplied and from on gripper bridges of a gripper carriage 8th gripped grippers seized at its front edge and in the sheet transport direction B intermittently through the various stations 2 . 3 and 4 the punching and embossing machine 1000 pulled.

The sheet transport system 7 has several gripper carriages 8th so that several bows 6 at the same time in different stations 2 . 3 and 4 can be edited. The gripper carriage 8th can be driven by a chain drive or in an alternative embodiment by an electromagnetic linear drive with traveling field motors. Such a drive system is the expert from the DE 20 2007 012 349 U1 known.

Also, the sheet punching and embossing machine may have separate drives of the sheet transport system and the individual processing stations.

The punching station 2 consists of a lower crucible, a so-called sub-table 9 , and an upper crucible, a so-called upper table 10 , The upper table 10 is vertically reciprocally mounted and provided with an upper tool with punching and Rillmessern. The undercounter 9 is firmly mounted in the machine frame and provided with a counter plate to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the undertable 9 be moved. In embossing, embossing tools, in particular in the form of so-called embossing dies, are used instead of the punching and scoring tools.

The gripper carriage 8th transports the bow 6 from the punching and embossing station 2 in the following stripping station 3 equipped with breakout tools. In the stripping station 3 With the help of the stripping tools, the unwanted pieces of waste are removed from the sheet 6 pushed out to the bottom, causing the waste pieces 11 into a cart-like container inserted under the station 12 fall.

From the breakout station 3 the bow comes 6 in the boom 4 where the bow 6 is either simply filed, or at the same time a separation of the individual benefits of each sheet 6 he follows. The boom 4 can also do a palette 13 included on the individual bows 6 in the form of a stack 14 be stacked so that after reaching a certain stack height the pallet 13 with the sheet pile 14 from the field of punching and embossing machine 1000 can be driven away.

In the 2a to 2 B is the process of aligning or positioning an arc 6 by means of an alignment device 100 shown over time. A bow 6 is from an investor 1 coming on a feed table 16 aligned before being subsequently processed, for example in a stamping station 2 , A bow 6 so far on the feed table 16 transported until independently driven transport and pressing elements 103 . 104 the bow 6 capture and further transport the bow 6 cause. Near the driven transport and pressing elements 103 . 104 are sensors 101 . 102 for circumferential measurement and tilt measurement of the arch 6 appropriate. The sensors 101 . 102 are in 2a represented as a filled circle, since they are at the time of 2a shown snapshot are active and the position of the sheet leading edge of the sheet 6 determine, ie it will change the position of the bow 6 in the circumferential direction - ie in the sheet transport direction B - and the position of the bow 6 measured obliquely to this direction. So it is found that the bow 6 has an output slope of α1, as well as a slight deviation in the circumferential direction. From one to the 2 not shown machine control 15 the correction requirement is determined to the arc 6 to spend from its actual position in terms of circumference and inclination in its desired position. This correction is implemented by an alignment movement e of the independently driven transport and pressing elements 103 . 104 like this in 2 B is indicated. The arc 6 is from the transport and pressing elements 103 . 104 , as in 2c shown, brought into its transfer position, being during the transport of the bow 6 in its transfer position by the individual control of the transport and pressing elements 103 . 104 the circumferential orientation and the skew of the bow 6 is corrected. How out 2c As can be seen, the initial initial bank angle α1 has been substantially reduced so that the arc 6 now located in a corrected tilt α2. Of the transport and pressing elements 103 . 104 becomes the bow 6 braked to a zero speed, ie stopped and then clamped. The clamping is realized in that the clamping or pressing elements 107 . 108 be spent in their operative position and the bow 6 against a pulling rail 109 press down. The stopped bow 6 is in its rest position by sensors 110 . 111 Measured in the circumferential direction, tilt and lateral direction. This is how to measure the lateral position of the bow 6 the distance of the respective side edges of the sheet determined by their respective desired position. In the example of 2c is the bow 6 too far left. The active state of the sensors 110 . 111 is indicated by a running circle. In one in the 2 not shown machine control 15 is the correction requirement of the bow 6 determined both in the circumferential and oblique directions as well as in the lateral direction.

The drawing rail 109 is moved by a drive, not shown, transversely to the sheet transport direction B and thereby leads, as in 2d shown, an alignment movement 1 as correction in lateral direction by: The bow 6 is shifted to the right until it assumes its lateral desired position. Based on the measurement results of the sensors 110 . 111 to the sheet position in the circumferential direction and inclined position determined in the 2 not shown machine control 15 another need for correction to the bow 6 to spend with respect to its oblique orientation and its circumferential orientation in its desired position. This fine correction is realized by positioning the transport grabber bridge 8.1 , In the in 2d illustrated transfer position of the bow 6 becomes the transport grabber bridge 8.1 independently adjustable register stops 713 . 714 stopped and aligned. A respective Passer stop 713 . 714 is an independent, from the machine control 15 controllable servomotor 715 . 716 assigned. According to the machine control 15 Determined correction requirements in the circumferential direction and oblique direction are the servomotors 715 . 716 actuated and perform a Stellhandlung the Passeranschläge 713 . 714 out. Once the lateral alignment of the bow 6 through the clamping or pressing elements 107 . 108 together with the pulling rail 109 as well as the positioning of the transport grabber bridge 8.1 are carried out, the holding force of the clamping or pressing elements 107 . 108 be lifted and the bow 6 from the grippers of the gripper bridge, which are not shown in detail 8.1 be taken. The bow so positioned in its three degrees of freedom 6 can then from the sheet transport system 7 through subsequent processing stations 2 . 3 . 4 be transported, where a register-accurate processing of the bow 6 can be done.

To clarify the alignment process of a bow 6 is the process in the 3a to 3d shown in a side view. From these figures shows that the independently driven transport and pressing elements 103 . 104 only so long on the bow 6 act until it is in its transfer position. As in 3d shown, then the pressing action of the transport and pressing elements 103 . 104 lifted, for example by the upper transport rollers are raised. In return, there are the clamping or pressing elements 107 . 108 in the 3a to 3c in a raised position and are lowered only when the bow 6 in its sheet transfer position, as in 3d shown.

By means of the others 4 . 5 and 6 further embodiments are described and illustrated:
As shown by 4a are the independently driven transport and pressing elements as lowerable rollers 103 . 104 executed, which is a bow 6 against one in the feed table 16 located bearing surface 112 press. The detectors 101 . 102 for circumferential and oblique measurement are - viewed in the sheet transport direction - downstream of the transport and pressing elements 103 . 104 arranged and executed by way of example as a camera system. In an alternative, in 4b embodiment shown are the detectors for circumferential and oblique measurement 101 . 102 exemplified as optical sensors, which - as viewed in the sheet transport direction B - upstream of the transport and pressing elements 103 . 104 are arranged.

The transport and pressing elements 103 . 104 are each formed as a pair of rollers, wherein at least one roller of a respective pair of rollers against the other role can be fed and wherein at least one of the two rollers is driven.

5a engages the embodiment of the clamping or pressing elements 107 . 108 in combination with a pulling rail 109 on, as they are already in the 2 and 3 is shown: A respective clamping or pressing element 107 . 108 is designed as a freely rotatable roller, this role against a in the plane of the feed table 16 located pulling rail 109 deliverable, ie lowerable, is and thus causes a bow 6 against the drawing rail 109 can be pressed. The lying in the sheet transport plane E bow 6 (not shown) can then by the drawing rail 109 an alignment movement in the transverse direction 1 be subjected. In the alternative embodiment according to 5b became the drawbar 109 through powered rollers 107 . 108 replaced. The rotational movement of the rollers 107 . 108 causes an alignment movement in the transverse direction 1 a bow 6 (not shown). In another, in 5c embodiment shown is the alignment movement in the transverse direction 1 a bow 6 (not shown) by the transverse displacement of a suction bar equipped with suction nozzles 113 reached. During the alignment process will be a respective arc 6 from the squeegee 113 sucked, so that the transverse movement of the squeegee 113 on the bow 6 is transmitted. The design of the squeegee 113 as a clamping element will not be described in more detail below, since such suction strips are well known to those skilled in the art and whose design is thus at the discretion of the skilled person.

As in 6 can represent a respective arc 6 with print marks 6.2 and a printed image 6.1 be provided. In determining the actual position of a respective arc 6 through the sensors 101 . 102 and 110 . 111 can then also the location of the print marks 6.2 and / or the printed image 6.1 be measured. In the machine control, not shown 115 can then be a comparison of the actual position of the print marks 6.2 or the print image 6.1 be pulled with their desired position. From this, as described above, a corresponding correction requirement can be calculated.

LIST OF REFERENCE NUMBERS

1

investor

2

punching station

3

stripping

4

boom

5

machine housing

6

bow

6.1

print image

6.2

print mark

7

Sheet transport system

8th

gripper carriages

8.1

Transport gripper

9

under table

10

overtable

11

trimmings

12

container

13

palette

14

delivery pile

15

Control with interface and input devices

16

feed

20

lower tool

30

upper tool

100

straightener

101, 102

Sensors for circumferential and oblique measurements

103, 104

independently driven transport u. pressing elements

107, 108

Clamping or pressing elements

109

formed template

110, 111

Sensors for circumferential, oblique u. page survey

112

bearing surface

113

transversely movable squeegee with suction nozzles

713, 714

independently adjustable register stops

715, 716

independent servomotors

1000

Sheet punching and embossing machine

e

Alignment movement (oblique and circumference)

l

Alignment movement (cross)

m

Alignment movement (oblique and circumference)

B

Sheet transport direction

e

Sheet transport plane

α1

Output skew

α2

corrected skew

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 3044083 A1 [0005]
• DE 2520232 [0009]
• DE 69314155 T2 [0010]
• DE 20216042 U1 [0011]
• DE 10136870 A1 [0012]
• DE 10136871 A1 [0012]
• DE 10136872 A1 [0012]
• DE 10136873 A1 [0012]
• DE 10136874 A1 [0012]
• EP 1300353 A2 [0012]
• EP 1300354 A2 [0012]
• DE 102008012775 A1 [0013]
• EP 1518803 B1 [0014]
• EP 1371588 B [0023]
• DE 202007012349 U1 [0035]

Claims (10)

Method for positioning sheets ( 6 ) made of paper, cardboard, plastic and the like for subsequent processing in a sheet-processing machine ( 1000 ), in particular sheet-fed printing press or sheet-punching machine, comprising the following steps: a) feeding a sheet ( 6 ) b) Transport of the bow ( 6 ) by a transport and pressing device acting on the sheet ( 103 . 104 ) c) measuring the position of the sheet ( 6 ) in circumferential and oblique direction to the sheet transport direction (B) in motion d) determination of the required correction movement in the circumferential and oblique direction to the sheet transport direction (B) e) alignment of the sheet ( 6 ) in circumferential and oblique direction to the sheet transport direction (B) by appropriate control of the transport and pressing device ( 103 . 104 ) f) stopping the bow ( 6 ) by the transport and pressing device ( 103 . 104 ) g) Clamping the bow ( 6 ) by means of a clamping device ( 107 . 108 . 109 h) measuring the position of the sheet ( 6 ) in the transverse direction i) measuring the position of the sheet ( 6 ) in the circumferential direction and oblique direction j) Determination of the required correction movement in the transverse direction k) Determination of the required correction movement in the circumferential and oblique directions l) Alignment ( 1 ) of the bow ( 6 ) in the transverse direction by a movement of the clamping device ( 107 . 108 . 109 ) m) positioning (m) a gripper device ( 8th . 8.1 ) at least in the circumferential and oblique directions n) passing the sheet ( 6 ) of the clamping device ( 107 . 108 . 109 ) to a gripper device ( 8th . 8.1 ) while the gripper device ( 8th . 8.1 ) is in a sheet transfer position. Method for positioning sheets ( 6 ) according to one of the preceding claims, wherein the sheet ( 6 ) is at rest during steps h) and i). Method for positioning sheets ( 6 ) according to one of the preceding claims, wherein steps h) and i) are carried out simultaneously and / or wherein steps 1) and m) are carried out simultaneously. Method for positioning sheets ( 6 ) according to one of the preceding claims, wherein the measurement according to c) takes place before or after the sheet ( 6 ) according to b) by the transport and pressing device ( 103 . 104 ) is transported. Method for positioning sheets ( 6 ) according to one of the preceding claims, wherein during the steps c) and / or h) and i) a measurement of the sheet edge and / or the printed image ( 6.1 ) on the sheet and / or print marks ( 6.2 ) on the bow. Method for positioning sheets ( 6 ) according to one of the preceding claims, wherein in a simpler embodiment, the steps i), k) and m) omitted. Contraption ( 100 ) for positioning sheets ( 6 ) made of paper, cardboard, plastic and the like for subsequent processing in a sheet-processing machine ( 1000 ), in particular sheet-fed printing press or sheet-punching machine, for carrying out the method according to claim 1, characterized in that it is in the transport and pressing device ( 103 . 104 ) by at least two pressing elements arranged parallel to one another and by a gripper carriage ( 8th ) with at a gripper bridge ( 8.1 ) attached grippers. Device for positioning sheets according to claim 7, characterized in that a respective pressing element ( 103 . 104 ) is designed as a pair of rollers with counter-driven rollers or as an employee against a located in the sheet transport plane bearing surface driven roller. Device for positioning sheets according to claim 7 or 8, characterized in that the clamping device is designed as a drawing rail ( 109 ) with at least two roles ( 107 . 108 ) or as two pairs of rolls ( 107 . 108 ) or as a transversely displaceable squeegee ( 113 ) is executed. A sheet positioning device according to claim 7, 8 or 9, characterized in that it includes register stops (15) associated with each gripper bar end ( 713 . 714 ) for register-accurate alignment of a gripper carriage ( 8th ) in the sheet transfer position, wherein a respective Passeranschlag ( 713 . 714 ) with a controllable drive ( 715 . 716 ) is connected to adjust the Passeranschlags ( 713 . 714 ).

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