EP1593626A1 - Front edge feeder - Google Patents

Abstract

The sheet feeder has two pairs of suction heads (2, 6), each of which has an upper and a lower suction pad. These are arranged one behind the other and pick up the top sheets of a stack (1), one-by-one and feed them in a continuous stream. Each pair of suction heads is fitted with its own vertical and horizontal drives (5, 9; 12, 15).

Description

The invention relates to a device according to the preamble of claim 1.

From DE-PS 842 349 a device for forming a continuously flowing arc of scaly staggered sheet is known. The apparatus shows a sheet separator above the front end of a sheet stack of the sheet separated and fed to a sheet-processing machine. The device has for this purpose two pairs of so-called double suckers. Each double suction cup has on its underside and on its upper side each a suction cup. The double suckers are hinged in pairs to lever mechanisms in such a way that each pair of double suckers can be placed both on the surface of the sheet stack in the area of its leading edge and lifted off the top of the sheet stack with a sucked sheet. Furthermore, the possibility is created by means of the lever mechanism that an attached to the bottom of one of the Doppelsaugerpaeren bow, after he was raised together with the double Sucker pair, is taken over by the top of the second Doppelsaugerpaares. Due to the further movement of the second Doppelsaugerpaares the sheet is raised at the top of this Doppelsaugerpaares and handed over a sheet guiding device, for example, a conveyor table.
During the steady promotion and the transfer of the raised arc between the double sucker pairs, the pair of suckers located at the top is to be guided around the leading edge of the bow which is to be further lifted by means of the first pair of suckers. The patent specifies for this purpose a circular path of movement of the two Doppelsaugerpaare. Accordingly, the movement is to be described as meaning that the double-suction pairs execute a movement which revolves around each other. From this design inevitably results on the one hand a complex drive system and on the other hand, a large height required above the sheet stack to allow the movements of the double suction and the optimized further transport of the sheet. In addition, a very technically complex guidance of the double suction is necessary to perform the coordination of the suction, transfer and dispensing operations of the sheet in an exact manner.

From EP 0 849 200 B1 a device for a continuous sheet transfer is known. It has a sheet feeder above which sheet stack a linearly moving transport device is provided. The linearly moving transport device is driven by means of a linear motor. The linear motor is formed from a guide designed as a traverse and a coil element guided within this traverse. The traverse is equipped with permanent magnets in the area of the guide elements, so that by means of a control of the power supply to the coil element of the so-designed drive can be moved as desired. On the above-mentioned coil element, a lifting-Schleppsauger unit is firmly attached. By means of the Hub-Schleppsauger aggregate the sheets are separated from the stack and can be transported forward by means of the drive. The device is therefore relatively complex, because the transport path of the lift-tow aspirator is to be provided with a very long guide and the linear motor is carried out correspondingly large volume. A further disadvantage is that the coil element is guided within the cross member and the guide or the traverse is therefore carried out correspondingly consuming by receiving the magnets.
Furthermore, the device described is suitable only for an aggregate for taking a Schuppenstromes at sheet separation at the trailing edge or for the removal of single sheets when removing the sheet separation of the leading edge.

The object of the invention is therefore to provide a device according to the preamble of Claim 1 and a method according to the preamble of the claim 8 to further develop a simplified and improved controllable device for generating sheet separation by front edge separation is created.

The stated object is achieved with the features of claim 1 and according to which a method according to claim 8 solved.

In particular, it is advantageous in the embodiment that the systems required for front edge separation can be driven independently of one another in two axes of movement. It is therefore possible to flexibly control the movement path of the teat elements and to optimally adapt the speed profiles of the teat elements to one another. Furthermore, the paths for moving the sheets and for the return movement of the suction elements can be minimized. Furthermore, the height of the device can be reduced to a minimum.
Advantageously, an adjustment to different operating conditions and materials to be processed can be adjusted by means of such a drive device. Here, the machine speed, the weight of the sheet material or the thickness of the sheet material can be considered.
Furthermore, it is advantageously possible to operate the drives according to a characteristic of parameters which are tunable to the materials, the environmental conditions and the operating processes, especially in connection with the sheet-processing machine. In addition, the parameters selected from the characteristic field for a job can be stored in relation to the sequences for specific processing jobs. Furthermore, an automatic selection of map data for presetting the nasal devices is possible for certain order specifications.
Advantageously, therefore, the suction device for sheet separation can be simplified by means of such a device in that no Hubsaugereinrichtung more is required. In this way, the double suckers used become flatter and the trajectories can be made more compact.

For operating the suction devices, it is possible to take advantage of the specific control options of the linear drives in such a way that their sensors are utilized with regard to the force effect. In a very advantageous manner, the force-evaluating operation of the linear motors can be used in the recording of sheets from the sheet stack. Here, the adaptation of the suction movement to different surface contours of a sheet pile is made possible in a simple manner.
Furthermore, by means of the force-controlled drive mode, the sheets can be positioned on abutment edges in order to ensure precisely the alignment of the sheets with respect to the processing position in the sheet-processing machine during the sheet feed.
Depending on the technical requirements, the drive configuration can advantageously be changed such that a part of the linear drives is designed in the form of simple mechanical or pneumatic drives. Thus, the lifting drive for the double suction can be carried out in a cost effective manner as a curve drive or as a pneumatic drive.
In the following, an exemplary embodiment will be explained in greater detail on the basis of drawings.

Figur 1

eine Seitenansicht der erfindungsgemäßen Vorrichtung,

Figur 2

eine Draufsicht auf die erfindungsgemäße Vorrichtung,

Figuren 3 (A) bis 3 (F)

einen Funktionssablauf der Vorrichtung in sechs Stufen und

Figur 4

eine Darstellung eines einzelnen Saugerantriebes.

The drawings show in detail in:

FIG. 1

a side view of the device according to the invention,

FIG. 2

a top view of the device according to the invention,

FIGS. 3 (A) to 3 (F)

a functional sequence of the device in six stages and

FIG. 4

a representation of a single Saugerantriebes.

In Fig. 1 is an elevational view of a Bogenunterzelungsvorrichtung in the design of a Front edge separator shown. This front edge separator is the leading edge of a Sheet pile 1 with respect to the conveying direction F of the sheets to be separated B assigned. The separated sheets B are in the conveying direction F one here supplied not shown sheet processing machine. These are the Sheets B normally via a conveyor table 17, for example a suction belt table, be guided. To safely take over the bows B from the leading edge separator on the conveyor table 17 can in this case a so-called clock role 18 may be provided. By means of the clock roller 18 of the conveyed single sheet in Clock of the sheet arrival at the conveyor table 17 fixed for further transport.

The front edge separator according to the invention is equipped with several suction drives Mistake. At the sheet stack 1 is near the leading edge and the surface of the Sheet stack 1 associated with a first double suction 2 shown. The first double aspirator 2 has both at its top and at its bottom one Suction plate supplied with suction or blown air. The corresponding air supplies of the first double suction 2 are not shown here in detail. The first Double suction 2 is attached to an axle 3, which in turn in a guide. 4 is held longitudinally displaceable. To move the axis 3 is on the guide. 4 a linear motor 5 attached. The axis 3 and thus also the direction of movement of the double suction 2 are aligned substantially horizontally.

Above and above the pile of sheets 1 and outside the area of Leading edge of the sheet pile 1 is another double suction 6 is shown. Also the second double suction 6 has both at its top and at its Bottom of a supplied with suction or blowing air suction cup. Also the Air supplies of the second double suction 6 are not shown here. Of the second double suction 6, an axis 7 is fixed, the longitudinally displaceable in a Guide 8 is arranged. To move the axis 7 is on the guide 8, a linear motor 9 provided. The axis 7 and thus the direction of movement of the second double suction 6 is substantially horizontal and also parallel aligned with the axis 3 of the first double suction 2.

Furthermore, the guide 4 of the first double suction 2 is arranged on an axis 10. The axis 10 is guided longitudinally displaceably in a guide 11 substantially in the vertical direction. To move the axle 10, a linear motor 12 is arranged on the guide 11 or fixed to the frame in the sheet feeder.
Furthermore, the guide 8 of the second double suction 6 is arranged on an axis 13. The axis 13 is arranged longitudinally displaceably in a guide 14 substantially in the vertical direction. To move the axis 13, a linear motor 15 is provided on the guide 14 or fixed to the frame in the sheet feeder.

To ensure accurate and secure sheet separation is in the field of Leading edge of the sheet pile 1 an arrangement of nozzles or other, also mechanically acting, separating elements provided. Furthermore, straightening elements provided on the sheet stack 1, which serve the stack edges during to keep the singulation straight. This ensures that only one at a time Sheet B is removed from the sheet stack 1 in a defined starting position.

In Fig. 2, the arrangement of the leading edge separator is shown in a plan view. It becomes clear that four double suckers 2, 6 are provided for singling sheet B from sheet stack 1. The axes 2 associated with the first double suckers 2 are arranged with their guides 4 and the associated linear motors 5 in the direction of the outer sides or the lateral edges of the sheet pile 1. In between, the second double suckers 6 associated drive elements are arranged. The second double suction 6 are this held on their axes 7 in the guides 8 and connected to the linear motors 9. Furthermore, the vertical axes 10, 13 are shown in dashed lines within the guides 4, 8.
The double suckers 2, 6 are each pairwise associated with each other and in a common vertical plane parallel to the conveying direction F out (dash-dotted line). So that the double suckers 2, 6 can be moved without collision and at the same time an exact transfer of the separated sheet B between the double suckers 2, 6 is possible, the double suckers 2 and 6 respectively by means of an angled bracket 2.1 or 6.1 with the axes 3 and 7 connected so that they lie in the position shown in the conveying direction F of the sheet B one behind the other. Here, the brackets 2.1 of the first double suction 2 with respect to the lateral edges of the sheet pile 1 are angled from outside to inside, while the brackets 6.1 of the second double suction 6 are angled from the inside to the outside.
Furthermore, the guides 4, 8 and the double suction 2, 6, when the axes 3, 7 and 10, 13 are designed as cylindrical guide elements are secured by means not shown here, simple and smoothest possible linear guides against rotation. First anti-rotation devices can be arranged parallel to the axles 3, 7 and connected to the double suckers 2, 6 and their guides 4, 8. Second anti-rotation devices can be arranged parallel to the axles 10, 13 and connected to the guides 10, 13 and the guides 4, 8 or fixed points.

The first two Doppelsauger 2 are as well as the two second double suction 6 moves synchronously. This results in the center line of the sheet stack 1 a both geometrically symmetrical arrangement of Saugerpaare and as well their corresponding common symmetrical movement. The directions of movement from the top view are shown in Fig. 2 with double arrows each to the Double suckers 2, 6 called. They are parallel to the conveying direction F of the bow. The vertical movement possibility is shown in FIG. 1 with respect to corresponding Double arrows on the axes 10 and 13 to remove.

The sequence of movement of the teat pairs is shown in FIG. 3 as follows:

• Fig. 3 (A): Am Beginn ist der erste Doppelsauger 2 der Stapeloberfläche im Bereich der Vorderkante des Bogenstapels 1 zugeordnet. Er übernimmt dort einen obersten Bogen B. Zu diesem Zeitpunkt befindet sich der zweite Doppelsauger 6 in Übergabeposition zum an den Bogenstapel 1 anschließenden Fördertisch 17 bzw. einer zugeordneten Taktrolle 18.
• Fig. 3 (B): Im ersten Schritt wird der erste Doppelsauger 2 vom Bogenstapel 1 abgehoben, während der zweite Doppelsauger 6 sich auf das Niveau der Stapeloberfläche bewegt.
• Fig. 3 (C): Im zweiten Schritt wird der zweite Doppelsauger 6 gegen die Förderrichtung F zur vorderen Stapelkante des Bogenstapels 1 zurückgeführt und in eine Position unterhalb des ersten Doppelsaugers 2 bewegt. Dabei wird der an der Unterseite des ersten Doppelsaugers 2 haftenden Bogen B auf die Oberseite des zweiten Doppelsaugers 6 übergeben.
• Fig. 3 (D): Im dritten Schritt bewegt sich der erste Doppelsauger 2 in Förderrichtung F zum Fördertisch 17. Gleichzeitig übernimmt der zweite Doppelsauger 6 an seiner Unterseite einen neuen Bogen B nahe an dessen Vorderkante von der Stapeloberfläche.
• Fig. 3 (E): Im vierten Schritt senkt sich der erste Doppelsauger 2 von der Ebene des Fördertisches 17 auf die Ebene der Oberfläche des Bogenstapels 1 ab, während der zweite Doppelsauger 6 auf die Ebene des Fördertisches 17 angehoben wird.
• Fig. 3 (F): Im fünften Schritt wird der erste Doppelsauger 2 gegen die Förderrichtung F über die Vorderkante des Bogenstapels 1 unterhalb des zweiten Doppelsaugers 6 bewegt.
  Der an dem zweiten Doppelsauger 6 an der Unterseite anhaftende Bogen B wird an die Oberseite des ersten Doppelsaugers 2 übergeben.
• Fig. 3 (A): Im sechsten gleich dem ersten Schritt wird der zweite Doppelsauger 6 in Förderrichtung F zum Fördertisch 17 bewegt und übergibt einen an seiner Oberseite anhaftenden Bogen B an den Fördertisch 17 ggf. in Zusammenwirken mit der zugeordneten Taktrolle 18. Der erste Doppelsauger 2 übernimmt einen neuen Bogen B von der Stapeloberfläche.
• Danach setzt sich der Bewegungszyklus wie beschrieben weiter fort.

The teat pairs run as the first double suction 2 and second double suction 6 each with each other in a plane. The sequence of a movement cycle of a teat pair (first double sucker 2, second double sucker 6) is shown in FIG. 3 and is marked in each position by means of an arrow quadrilateral.

• Fig. 3 (A): At the beginning of the first double suction 2 of the stacking surface in the region of the front edge of the sheet stack 1 is assigned. He takes over there a top sheet B. At this time, the second double suction 6 is in the transfer position for subsequent to the sheet stack 1 conveyor table 17 and an associated clock roller 18th
• Fig. 3 (B): In the first step, the first double suction 2 is lifted from the sheet stack 1, while the second double suction 6 moves to the level of the stack surface.
• Fig. 3 (C): In the second step, the second double suction 6 is returned against the conveying direction F to the front stacking edge of the sheet stack 1 and moved to a position below the first double suction 2. In this case, the adhering to the underside of the first double sucker 2 sheet B is transferred to the top of the second double suction 6.
• 3 (D): In the third step, the first double suction 2 moves in the conveying direction F to the conveyor table 17. At the same time, the second double suction 6 takes on its underside a new sheet B near the front edge of the stacking surface.
• Fig. 3 (E): In the fourth step, the first double suction 2 lowers from the plane of the conveyor table 17 to the plane of the surface of the sheet stack 1, while the second double suction 6 is raised to the level of the conveyor table 17.
• Fig. 3 (F): In the fifth step, the first double suction 2 is moved against the conveying direction F on the leading edge of the sheet stack 1 below the second double suction 6.
  The adhering to the second double suction 6 at the bottom sheet B is transferred to the top of the first double suction 2.
• Fig. 3 (A): In the sixth equal to the first step, the second double suction 6 is moved in the conveying direction F to the conveyor table 17 and transfers an adhering to its top sheet B to the conveyor table 17, if necessary in cooperation with the associated clock roller 18. Der erste Double suction 2 takes over a new sheet B from the stack surface.
• Thereafter, the motion cycle continues as described.

The individual movements of the double suckers 2, 6 are achieved by means of the linear motors 5, 9 and 12, 15. In this case, the horizontal movements for the sheet B in the conveying direction F between the sheet stack 1 and the conveyor table 17 by the linear motors 5, 9 generates. The vertical movements between the plane of the sheet stack 1 and the plane of the conveyor table 17 are generated by the further linear motors 12, 15.
The double suckers 2, 6 are each supported on smooth linear guides, so that they can comply with their horizontal position.
In the simplest case, the geometric shape of the trajectory of each double suction 2, 6 is a rectangle. The rectangle of the movement path is determined by the fact that the double suckers 2, 6 are moved in their outer contours and with respect to the front edge of the sheet B to be transported around each other. It must be ensured that it can not lead to a collision of the double suction 2, 6 with each other or one of the double suction 2 and 6 with the front edge of a singled and held by the other double suction 6 and 2 sheet B.

Essential to the assignment of the double suction 2, 6 to each other is that at least both pairs of suction cups each have independent drives for the lifting or separating movement and the transport movement. In the optimal case, even each double suction 2, 6 each have an independent drive on the one hand for the lifting or separating movement and on the other hand for the transport movement. In some cases, the drives for the pairs of suckers in the one drive level can be combined into one drive, but be provided separately from one another in the other drive level.
It is also possible to replace partial drives with single mechanical drives. For this purpose, for example, the linear actuator would be suitable. In a preferred manner, the linear actuator could also be replaced by a simple cam gear instead of a linear motor. An eccentric cam could generate the lifting movement, with side-by-side separate drives for the lifting movements of the teat pairs being possible. The lifting drive could also be done for each pair of sucker with a common cam. The coordination of the double suckers 2, 6 in their movement cycle can take place by means of the transport movement via the linear motors. The collision freedom between the double suckers 2, 6 and the leading edge of the sheets B and the transfer times for the sheets B are essentially ensured by the positioning of the double suckers 2, 6 via the horizontally acting linear motors 5, 9.

Even with the last drive version can coordinate the cycle of bow-passing be controlled freely. The controller may provide that speed adapted with respect to a master drive, for example the processing cycle a sheet processing machine, should be adjusted. Farther can in dependence on the said master drive further references from the machine speed, the weight of the material or the thickness of the material be won.

A drive device for the first double suction 2 is shown schematically in Figure 4 in more detail.
The double aspirator 2 has an upper aspirator 2A and a lower aspirator 2B. The Saugluftzuführungen to the suckers 2A and 2B are not shown here. The double suction 2 is attached to the axle 3. In addition, the double suction 2 is hinged to a straight guide 21. The linear guide 21 is supported on the guide 4 and thus secures the double suction 2 against rotation relative to the guide 4. The axis 3 is guided in a bearing 19 within the guide 4 smoothly running. On the double suction 2 opposite side of the guide 4 of the linear motor 5 is fixed. A coil-magnet arrangement 20 of the linear motor 5 which effects the drive movement is coupled to the axis 3 and moves it and thus the double suction device 2 in the direction of the axis 3 back and forth. The control of the linear motor 5 allows any adjustments of the paths, speeds and effective forces at any point within the range of movement of the coil-magnet assembly 20th
Finally, the guide 4 is arranged on an axis 13 for the vertical lifting movement. The axle 13 can be connected to a linear motor in the same way as described above. The guide 4 is connected to the rotation in relation to the investor arrangement in the vertical direction with a frame-fixed straight guide 22.

In a particularly advantageous manner can be by means of the linear motors used 12, 15 generate a force-controlled movement. For this it is possible the double suckers 2, 6 each on the top of the sheet stack 1 depending on the contact force to move. This eliminates the need for uneven sheet piles 1 for secure sheet transfer from the stack surface additional compensation elements, how to use telescopic vacuum cleaner on the double suction cups 2, 6.

Furthermore, the transfer of the sheet B on the conveyor table 17 can also be force-controlled. Thus, each sheet B can be guided with its leading edge against a contact surface. The force control of the linear motors 5, 9 then ensures that the sheets B rest securely and over the entire sheet width of the contact surface. As a bearing surface come in sheet-processing machines, for example, also rows of so-called leading brands, which serve to align the sheet B after its leading edge. In the same way analogous so-called page marks are known, which serve to align the sheet B to one of its side edges.
Likewise, in this way, the supply of sheet B directly to so-called pre-grippers or plant drums for sheet-processing machines possible. In this case, the sheets B are introduced by means of the suction systems directly into gripper systems on the corresponding conveyor elements. The gripper systems offer similar alignment elements as front lays.
The sheets B can be passed in this mode of operation by means of the linear motors 5, 9 without determining a transport path optimized to the alignment systems or the transport systems in the sheet-processing machine. Of course, depending on the force-controlled movement, the supply of suction and blowing air to the double suckers 2, 6 is also affected.

The orientation of the bow B can also depend on the initial position of the bow B done on the sheet pile or after the separation of the sheet pile. Also for this purpose, the linear motors 5, 9 are suitable. Their drive movement can depend on the measured values of a measuring device for the position of the leading edge a sheet B are controlled, so that a defined sheet position in Reference to the sheet processing machine is specifiable. Such a controller the drive of the linear motors 5, 9 can for a correction of a misalignment due to the readings being executed or else they may be for a bow displacement due to internal specifications in the sheet processing machine to be necessary.

In relation to this, the control of the device is provided such that the supply adjusted by suction or blowing air within a map. The Adaptation of this map is done in relation to a machine speed or a material type or a material weight. At the same time, the feed the suction or blown air depends on the map change made from the force measurement be determined.

To improve the supply of suction or blown air to the double suckers 2, 6, the means for supplying air should be adaptable to the needs of the drive control.
For this purpose, for example, to provide a control roller, which allows the air control for the supply of blowing or suction air in the required power stroke. The control roller can also be multi-part, ie consist of several sub-rollers. This control roller or the sub-rollers of the control roller are preferably driven by direct drives. The direct drives of the control rollers are mechanically decoupled from the drives for the suction movement, but have a control connection to the control of the drives for the suction movement, ie for controlling the linear motors 5, 9 and 12, 15 on. As a result, an adjustment of the air supply in all process stages is continuously possible to the respective processing parameters. This refers to the setting of the level of the pending pressure, to the application and end time of the air supply, to the duration of a power stroke and possibly also to the transitions when switching on and off the air supply.

The invention is not limited to the specific embodiment of the examples mentioned limited. It also extends to everyone within the scope of expert knowledge attributed to the solutions shown further possible solutions.

LIST OF REFERENCE NUMBERS

1

sheet pile

2

Doppelsauger

3

axis

4

guide

5

linear motor

6

Doppelsauger

7

axis

8th

guide

9

linear motor

10

axis

11

guide

12

linear motor

13

axis

14

guide

15

linear motor

16

frame

17

conveyor table

18

synchronizing roller

19

storage

20

Winding-magnet arrangement

21

straight guide

22

straight guide

2A

upper sucker

2 B

lower sucker

B

bow

B1

bow

B2

bow

B3

bow

F

conveying direction

Claims (15)

Device for sheet separation with at least two pairs of double suckers (2, 6), wherein each double suckers (2, 6) each have a suction on the bottom and on the top, for the removal of sheets (B) from a sheet stack (1) whose in the conveying direction (F) of the sheet (B) lying front edge serve, the double suction (2, 6) are each designed as a unit, further having a drive, such that the movement path respectively corresponding double suction (2, 6) a closed respectively around the other double suckers (2, 6) around the track by a sheet (B) after removal from the sheet stack (1) by intermediate transfer between the double suckers (2, 6) and then passed on to a conveyor system,
characterized in that for generating the separating movements of each of a double suction (2, 6) for lifting the sheet stack (1) and for transporting the sheet (B) in the conveying direction (F) at least two mutually mechanically independently driven drives (5 or 12; or 15) are provided. Device according to claim 1,
characterized in that for generating the separating movement of a double suction device (2, 6) a drive for a substantially horizontal axis (3; 7) and a drive for a substantially vertical axis (10; 13) is provided and that a control to the common Operation of the drives is provided. Apparatus according to claim 1 or 2,
characterized in that for generating the separating movement in each case per axis (3, 7, 10, 13), a linear motor (5, 9, 12, 15) is provided and that the linear motors (5, 9, 12, 15) by means of a common control operate. Apparatus according to claim 1 to 3,
characterized in that at least two pairs of suckers from double suckers (2) and double suckers (6) are provided and that the pairs of suckers are driven independently of each other by means of two linear motors (5 or 12, 9 and 15) in a substantially horizontal or vertical direction are. Apparatus according to claim 1 to 4;
characterized in that the horizontal movement is coupled with the vertical movement insofar as the horizontal drive is arranged on the vertical drive. Apparatus according to claim 1 to 5;
characterized in that drives as the force effect limiting controllable linear motors (5, 9, 12, 15) are executed. Apparatus according to claim 1 to
characterized in that one or more control rollers for controlling the supply of suction or blowing air to the double suckers (2, 6) is provided and that the control rollers for controlling the suction and blowing air can be driven by one or more direct drives, wherein the direct drives are not mechanically coupled to the drives for the singulation movement. Method for separating sheet material according to the principle of leading edge separation by means of at least two pairs of double suckers (2, 6) by means of drives between a take-off position on a sheet stack (1) an intermediate transfer position between the double suckers (2, 6) and a transfer position of a downstream conveyor be guided on a closed trajectory,
characterized in that the separating movements are produced by two drives (5, 12, 9, 15) which are not mechanically coupled to one another, wherein the separating movements have two separating systems running around each other and the control of the drives (5, 12, 9, 15) ) takes place in each case depending on the position of a corresponding drive. Method according to claim 8,
in that the drives (5 or 12, 9 or 15) in the course of each other or in relation to a master drive are influenced by a further variable, for example the machine speed, the weight of the material or the thickness of the material. Method according to claim 8 or 9,
characterized in that the forces from the movement of the drives (5 or 12, 9 and 15) are determined during a power stroke at least one point of the movement sequence. Method according to claims 8 to 10,
characterized in that the characteristic diagram for the control of the drives (5 or 12, 9 or 15) is influenced by the measured forces during a sequence. Method according to claims 6 to 9,
characterized in that the control of the suction and blowing air for the double suckers (2, 6) with respect to control times, and air pressure and air quantity according to a map, the at least one variable eg the speed of sheet processing, but preferably several variables such as the speed and / or the type of material and / or the weight of the material used. Method according to claims 8 to 12,
characterized in that the drives (5 or 12, 9 and 15) in the sequence to each other or in relation to a master drive of a measurement of the position of the leading edge of the separated sheet (B) or the position of the leading edge of the sheet pile (1) become. Method according to claims 8 to 12,
characterized in that the drives (5 or 12, 9 and 15) in the sequence to each other or in relation to a master drive of a position signal with respect to the desired position of the leading edge of the separated sheet (B) with respect to a subsequent to a sheet feeder sheet processing Machine to be influenced. Method according to claim 13 or 14,
characterized in that the drives (5 or 12, 9 and 15) with respect to the desired position of a side edge of the separated sheet (B) are influenced.

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