DE102017221215B4 - sheet processing machine - Google Patents

Abstract

Sheet processing machine with a sheet separator (3) for separating sheets (15) from a stack (1), a sheet guiding system in the form of a sheet guiding cylinder (8.1, 8.2, 9) or a sheet guiding belt, an acceleration device for accelerating sheets (15) at least a transport speed of the sheet guiding system (8.1, 8.2, 9), a first alignment device which has a stop (13) rotating at the transport speed of the sheet guiding system (8.1, 8.2, 9), the stop (13) of a transport device (7) with a is assigned to a flat transport area for transporting sheets (15) at a speed that is higher than the transport speed of the sheet guiding system (8.1, 8.2, 9) and the stop (13) is guided in a translatory manner at least in some areas in the transport area of the transport device (7) and the transport device (7 ) conveys the sheets (15) against the stop (13), the sheet guiding cylinder (8.1, 8.2, 9) having a leading edge gripper system and the sheet guiding cylinder (8.1, 8.2, 9) having one or more sheet guiding cylinders (8.2, 9) having at least one leading edge gripper system are arranged downstream and at least one front edge gripper system is arranged on the respective sheet guiding cylinder (8.1, 8.2, 9) so that it can be displaced axially thereon, a side edge sensor (17) being provided for detecting the position of the side edge of sheets (15) and a control device which is used to correct the Lateral position of the sheet (15) depending on the signals of the side edge sensor (17) controls an actuator for moving a leading edge gripper system of a sheet guiding cylinder (8.1, 8.2, 9).

Description

The invention relates to a sheet processing machine with an acceleration device and an alignment device.

The material is typically fed to sheet processing machines in an imbricated stream. The advantage of this solution is that the average speed of the shingled stream is low, which simplifies sheet alignment at the sheet infeed. The disadvantage of this method is that the sheet is first separated and accelerated and then slowed down again on the system in order to then be accelerated to production speed again within one sheet cycle.

The WO 02/048011 A1 describes a device for aligning sheets on a sheet-fed printing press. The device for aligning sheets is preceded by a shingling device which produces a shingled flow of sheets. The device comprises suction rollers on which front lays are arranged, against which the front edges of individual sheets of the imbricated stream are conveyed one after the other. The sheets are conveyed against the front lays at relative speed, so that the front edge of each sheet is aligned by braking against the front lays.

The EP 0 947 455 A1 describes a device for feeding flat goods to a machining process with precise positioning, in which several alignment elements are actuated as a function of sensors arranged one behind the other. For a lateral alignment, it is provided that a lateral movement of the goods is realized transversely to the direction of transport. The goods are longitudinally aligned by means of an accelerated or decelerated longitudinal movement in the transport direction. When the position or location of the item is corrected, this item does not hit a stop or the like, rather the flat item is acted upon by a driving force or a driving moment that causes the rotational movement, the lateral alignment or an acceleration or deceleration of the item. When aligning them in a row, the goods are in a lying position and are transported with a transport device.

The DE 10 2009 046 089 A1 shows the sheet feeder of a sheet-processing machine, which has a sheet separator and a conveyor belt, which is followed by an alignment unit. The alignment unit includes alignment wheels that can be driven independently of one another. The transport speed of the conveyor belt is controlled as a function of a measurement signal from a sheet arrival sensor. No stop is used when separating and aligning the sheets. The sheets are transported separately at a distance from one another, decelerated to a standstill after alignment and fixed in a transfer position. The invention is therefore based on the object of creating a solar system with a solar collector that is effectively protected against overheating.

From the EP 0 120 348 A2 a device and a method for aligning sheets is known. The front edge of the sheets is aligned in such a way that the sheets fed to the device in imbricated form are fed to an alignment cylinder in the device at a conveying speed that is at least slightly greater than the peripheral speed of the alignment cylinder. Front lays are arranged on the circumference of the alignment cylinder, against which the front edge of the sheet can be brought into contact. Because of the relative speeds between the sheet and the front lays, the front edge of the sheet is at least slightly decelerated at the front lays, thereby aligning the front edge of the sheet. After aligning the front edge of the sheet, the sheet is fixed in the area of the front edge by applying a vacuum to a suction bar, so that the sheet wraps around the circumference of the alignment cylinder due to the continuous rotary drive of the alignment cylinder. After the front edge of the sheet has been aligned and before the sheet is transferred to a downstream device, the lateral offset of a side edge of the sheet is measured using a measuring device. Depending on the measurement result, the squeegee, to which the front edge of the sheet is fixed, is linearly adjusted axially in the direction of the axis of rotation of the alignment cylinder in order to thereby align the side edge of the sheet according to the desired target alignment. The result is that the sheet can be transferred to a downstream device, for example a sheet-fed printing press, in the correct position both in relation to the front edge and in relation to a side edge.

From the DE 23 13 150 C3 a device for sheet feeding for a sheet-fed rotary printing machine is known, in which the sheets are conveyed in a shingled manner on a feed table to and from the device. The use of suction rollers is described for conveying the sheets lying flat on the feed table, with recesses provided on their entire circumference. By applying a negative pressure, the sheet can be fixed on the circumference of the suction roller. The suction roller is arranged in a recess of the feed table in such a way that the sheets lying flat on the feed table and lying tangentially on the circumference of the suction roller can be driven. This ensures that the sheets only come into contact with the suction roller in a linear contact area, with the driving forces being transmitted from the suction roller in the linear contact area to the sheet by friction. It is therefore not necessary for the sheets to be wrapped around the suction rollers.

From the WO 97/35795 A1 a device with a suction drum is known, on the circumference of which the sheets to be transported can be frictionally fixed by applying a negative pressure. The drive of the suction drum is designed in such a way that the speed and/or the angle of rotation of the suction drum can be regulated by an independent electric motor according to predetermined laws of motion.

From the DE-AS 20 46 602 a sheet feeder for printing presses is known in which the lateral offset of a side edge of the sheet relative to a target alignment can be determined using a measuring device. To align the side edge of the sheet, an alignment cylinder, on the circumference of which the sheet is fixed, can be adjusted axially in the direction of its axis of rotation, depending on the measurement result.

From the EP 07 16 287 A2 a non-contact device for measuring the position of sheets is known, in which the side edges of the sheets can be measured by means of an optical system.

The DE 10 2009 008 776 A1 discloses a device for aligning sheets to stops in a printing press that move in a translatory manner, the sheets being conveyed to the stops at a predetermined speed.

The DE 102 05 488 A1 describes a transport system of a metal plate printing machine, with front edge stops acting on the respective front edge of the metal plates. The front edge stops are assigned to a feed drum and can be arranged on a revolving belt.

From the DE 10 2009 008 781 A1 a device for aligning sheets to stops in a printing press is known. The device is placed at the end of a feed table and the stops are placed on an alignment cylinder. The sheets are conveyed at a predetermined speed to the stops, which execute a translatory movement generated by a cam mechanism.

The DE 34 42 135 A1 discloses a device for aligning sheets in the conveying and lateral directions during their imbricated transport over a feed table. For alignment in the conveying direction, front edge alignment marks are provided, which are attached to a revolving drive means.

The EP 2 008 956 B1 describes a device for feeding sheet-like goods, in particular sheet metal, to painting and/or printing machines with precise positioning.

The DE 41 22 947 A1 discloses a device for optimizing the sheet system when transporting sheets to the front stop of a sheet-fed printing press.

The EP 1 661 832 A1 shows a paper sheet feeder with a suction belt.

The object of the invention is to create a sheet processing machine with an alignment device that enables precise sheet positioning even at high machine speeds.

According to the invention, the object is achieved by a sheet-processing machine having the features of the independent patent claim. Advantageous configurations emerge from the dependent claims, the description and the figures.

The advantages that can be achieved with the invention are, in particular, that sheets are separated from a stack, accelerated to machine speed and transferred to the processing units or processing units of the sheet-processing machine, with the sheets being aligned while they are moving. It is particularly advantageous here that the arrangement of a plurality of acceleration means means that the acceleration means are only exposed to low mechanical loads due to the comparatively low decelerations or accelerations.

• 1 Details einer bogenverarbeitenden Maschine mit einer einstufigen Beschleunigungsvorrichtung,
• 2 Details einer bogenverarbeitenden Maschine mit einer zweistufigen Beschleunigungsvorrichtung,
• 3 Details einer bogenverarbeitenden Maschine mit einer Beschleunigungsvorrichtung und einer geneigten Transportvorrichtung,
• 4 eine verlagerbare Transportvorrichtung,
• 5 in schematischer Form Details einer bogenverarbeitenden Maschine mit umlaufendem Anschlag,
• 6 Details einer Beschleunigungsvorrichtung.

In the accompanying figures shows

• 1 Details of a sheet-processing machine with a single-stage accelerator,
• 2 Details of a sheet processing machine with a two-stage acceleration device,
• 3 Details of a sheet processing machine with an acceleration device and an inclined transport device,
• 4 a relocatable transport device,
• 5 in schematic form details of a sheet processing machine with a rotating stop,
• 6 Details of an accelerator.

According to one embodiment, the sheet-processing machine can have a feeder, a delivery and one or more offset printing units and/or varnishing units and/or non-impact printing units, in particular inkjet printing units, arranged between the feeder and the delivery. Each offset printing unit and/or each coating unit preferably includes at least one sheet guiding cylinder 9 which has a gripper system for gripping the leading edges of the sheet.

An offset printing unit preferably has a sheet guiding cylinder 8.1, 8.2, 9 designed as a printing cylinder and a rubber blanket cylinder which interacts with the printing cylinder and a plate cylinder which interacts with the rubber blanket cylinder. Each plate cylinder is assigned an inking unit for inking a printing plate that can be fixed on the plate cylinder and, preferably but not necessarily, a dampening unit. Each coating unit preferably includes a plate cylinder which is assigned directly to the printing cylinder and has means for clamping a coating plate. The non-impact printing units can have one or more sheet guiding cylinders 8.1, 8.2, 9 with gripper systems for gripping the leading edges of the sheet and one or more non-impact printing devices, in particular inkjet printing units, assigned to one or more of the cylinders.

Instead of the sheet guiding cylinders 8.1, 8.2, 9, a non-impact printing unit can also have a sheet transport device in the form of a circulating belt, in particular a suction belt, which is assigned a non-impact printing device.

The display preferably includes a chain conveyor system. It can have chains running around rear and front sprockets. Gripper devices are preferably arranged on the chains, which rotate with the chains and are also referred to as gripper bridges.

The feeder preferably comprises a stacking space with a stack support 2, in particular a stack support plate, which can be moved vertically with a sheet stack 1 that can be positioned on the stack support 2 by means of a lifting system. For separating the sheets 15 present as a sheet stack 1, a sheet separator 3 is provided, which is preferably arranged above the stack support plate in the stacking space.

The sheet separator 3 can be designed in a manner known per se as a leading edge separator or as a trailing edge separator and can include lifting suction devices and trailing suction devices. The lifting suckers lift the respective uppermost sheet 15 of the stack of sheets 1 from this and preferably transfer it to the towed suckers for onward transport in the direction of sheet guiding cylinders 8.1, 8.2, 9 Blown air are supported from a button foot also not shown.

An acceleration device is arranged downstream of the sheet separator 3 in a transport direction of the sheet processing machine. The acceleration device can be formed by a pair of rollers 4, which is formed by a lower roller and a cycle roller that can be assigned to the lower roller in the machine cycle of the sheet-processing machine. The timing roller can be driven by a piezoelectric actuator to move it. The lower roller can be accelerated to the transport speed of the sheet guiding system that can be designed in the form of a sheet guiding cylinder 8.1, 8.2, 9 or a sheet guiding belt. The timing roller is preferably freely rotatable on a roller lever and when pivoted in the direction of the lower roller brings a sheet 15 located between the lower and the timing roller into contact with the lower roller, thereby accelerating it to the speed of the lower roller. The lower roller can also rotate at a speed that is greater than the transport speed of the sheet guiding system. The drag sucker can be part of the acceleration device and transports a respective sheet 15 into the gap formed between the lower roller and the timing roller. Instead of the pair of lower roller and timing roller or downstream of this, a pair of rollers 5 can also be arranged that is formed from two rollers that interact with one another and always revolve at the same speed. Likewise, instead of the pair of rollers 5, a suction belt can also be arranged. The suction belt can be part of a belt table 6 . The pair of rollers 4, the pair of rollers 5 or the suction belt can form an acceleration device. The acceleration device can also be formed by several of the elements mentioned (pair of rollers 4, pair of rollers 5 or the suction belt) and in this case preferably works in several stages, such that the speed of the elements connected in series increases in the transport direction of the sheet processing machine.

According to a preferred embodiment, the acceleration device comprises at least at least two acceleration means 21, 22 arranged next to one another and accelerating the sheets 15. Preferably, a plurality of first and second acceleration means 21, 22 are arranged alternating with one another, viewed transversely to the transport direction of the sheet-processing machine. The acceleration means 21, 22 can be designed as suction belts 6, as suction rollers, as belts interacting with timing rollers, or in some other suitable manner. The suction belts 6 are preferably designed as endless, circulating belts which are interrupted by suction openings and have an acceleration strand. In the area of the acceleration strand, the suction belts 6 are assigned to a suction box 20 in such a way that suction openings formed in the suction box 20 are swept by the suction openings in the suction belts 6 . If a vacuum is generated in the suction box 20 by a suction air source (not shown), this spreads via the suction openings in the suction box 20 and the suction openings in the suction belts 6 and causes the undersides of sheets 15 to be fixed when they enter the effective area of the suction air. Preferably, instead of a pure suction air source, an air source can also be formed which can be switched between a suction air supply and a blast air supply.

If the acceleration means 21, 22 are configured as suction rollers, an air source can also be configured, which can be switched between a suction air supply and a blown air supply. In this case, the air source is not associated with the suction box 20. The suction air is preferably generated from blown air via an ejector effect and is made available directly at the point of action. It is thus possible to generate an oscillating vacuum using a rotary valve, so that the sheet 15 can be moved slightly on the suction belt, e.g. B to accomplish a page alignment. The one or more first and one second or more second acceleration means 21, 22 are driven in a discontinuous revolving manner according to a predetermined speed-time law. The one or more first acceleration means 21 are driven out of phase with the one or more second acceleration means 22 . The phase offset corresponds at least approximately to the cycle with which the sheet guiding system 8.1, 8.2, 9 conveys sheets 15.

The at least one first and at least one second acceleration means 21, 22 preferably act alternately on the sheets 15 of a sheet sequence. In other words, based on a machine cycle of 360 degrees per sheet 15, 720 degrees are available for acceleration and deceleration for each acceleration means 21, 22, 360 degrees being for acceleration and 360 degrees for deceleration. The accelerations and decelerations that occur in the acceleration means 21, 22 fall back to a quarter compared to a non-alternating drive mode.

The speed-time law for driving the acceleration means 21, 22 includes in particular a minimum speed or a minimum speed range equal to zero, close to zero or equal to the transport speed of the sheet separator 3 in the transport direction and a maximum speed or a maximum speed range equal to the transport speed of the sheet guiding system in the form of a sheet guiding cylinder 8.1, 8.2, 9 or a sheet guiding belt.

According to one embodiment, each first and each second acceleration means 21, 22 has its own drive. Likewise, all first acceleration means 21 can have a common first drive and all second acceleration means 22 can have a further common second drive independent of the drive of the first acceleration means 21 . According to one embodiment, several speed-time laws can also be stored in a memory with regard to at least one of the processing parameters format, printing speed or printing material and input to the drives of the acceleration means 21, 22 by a controller.

Sensors can be designed to query the extent to which certain processing parameters are present in a specific case, the signals of which are fed to the control of the drives.

A controller is preferably designed to switch the suction air supply and/or the blower air supply. The control effects the supply of suction air and/or the supply of blown air in accordance with the speed-time law implemented for the acceleration means 21, 22.

The sheet separator 3 and/or the elements of the acceleration device are preferably designed or controlled in such a way that a sheet gap is formed between two consecutive sheets 15 viewed in the transport direction. In contrast to the imbricated stream that is customary, particularly in conventional printing presses, a non-imbricated, in particular a single-sheet system is thus implemented.

The acceleration devices are in the transport direction of the sheet processing Machine preferably considers one or two transport devices 7 downstream.

The or each transport device 7 can comprise a belt table 6 with motor-driven suction belts arranged next to one another or a pair of rollers 4, 5.

A sheet guiding system in the form of a sheet guiding cylinder 8.1, 8.2, 9 or a sheet guiding belt is preferably provided after the last transport device 7 viewed in the transport direction of the sheet processing machine.

To align the sheets 15, a rotating stop 13 is formed as part of the sheet-processing machine, which moves at the transport speed of the sheet-guiding system. The speed of the stop 13 thus corresponds to the processing speed of the sheet processing machine.

The peripheral stop 13 can be part of a first alignment device or form a first alignment device.

According to one embodiment, the peripheral stop 13 can also be part of the sheet guiding system; in particular, the sheet guiding cylinder 8.1, 8.2, 9 can have a front edge gripper system that forms or encompasses the stop 13. If the leading edge gripper system of a sheet guiding cylinder 8.1, 8.2, 9 forms the stop 13, one or more additional sensors arranged in the area of the sheet guiding cylinder 8.1, 8.2, 9 can be used to monitor whether and/or to what extent a respective sheet 15 has aligned itself with the stop 13. The closing movement of the leading edge gripper system can be controlled by a control device depending on the signals from one or more of the additional sensors.

The stop 13 can also be designed without a mechanical connection to the sheet guiding system. For this purpose, the stop 13 can be associated with a belt 14 or a chain 14, with the belt 14 or the chain 14 preferably running over a rear and a front deflection wheel.

In the case of assignment to a sheet guiding cylinder 8.1, 8.2, 9, the stop 13 moves on a circular path, in the case of assignment to a belt 14 or a chain 14, preferably in a translatory manner in some areas.

Accordingly, the stop 13 can be assigned to a transport device 7 with a flat transport area for conveying sheets 15, the stop 13 being guided in a translatory manner at least in certain areas in the transport area of the transport device 7 and the transport device 7 conveying the sheets 15 against the stop 13.

The stop 13 is preferably used for the fine alignment of sheets 15. The stop 13 develops its effect in that a respective sheet 15 to be aligned is conveyed by a transport device 7 at a transport speed which is greater than the speed of the stop 13. Due to the relative speeds between the sheet 15 and the stop 13, the front edge of the sheet 15 is at least slightly decelerated at the stop 13 and the front edge of the sheet 15 is thereby aligned. After the front edge of the sheet 15 has been aligned, the sheet 15 is preferably fixed in the area of the front edge by closing a front edge gripper system of a sheet guiding cylinder 8.1, 8.2, 9 or by applying a vacuum to a suction bar or a sheet guiding belt designed as a suction belt. The transport speed of the transport device 7 in the effective range of the stop 13 can be specified by mechanically connecting the drive acting on the stop 13 to the drive of the transport device 7 . Likewise, the transport speed of the transport device 7 can also be controlled by a control device. For this purpose, the control device can be connected to sensors 16, 17 on the input side. Depending on the type of drive and its nature, a transport device 7 can also be part of a second alignment device.

For this purpose, at least one sensor 16 is preferably provided for detecting the position of a sheet 15 in a transport direction of the sheet guiding system, which can be arranged at any location along the sheet transport path.

According to one embodiment in which the transport speed of a transport device 7 conveying a sheet 15 directly against stop 13 is controlled, the control device for controlling the transport speed of at least one transport device 7 is dependent on the values detected by sensor 16 and on the values representing the position of stop 13 Values formed such that the leading edge of each sheet 15 is aligned in motion by contact with the stop 13.

The transport device 7 already aligns a respective sheet 15, preferably in relation to the transport direction, before its front edge reaches the stop 13. The subsequent fine alignment is then carried out by the front edge of the respective sheet 15 resting against the stop 13. Both in the alignment and in the fine alignment the sheets 15 are transported by one and the same transport device 7 in this case.

According to one embodiment in which the transport speed of a transport device 7 that does not convey a sheet 15 directly against the stop 13 is controlled, the control device for controlling the transport speed of at least one transport device 7 as a function of the values detected by the sensor 16 and from which the position of the stop 13 values representative formed such that the leading edge of each sheet 15 is aligned in motion with respect to the stopper 13 without contact. The transport device 7 already aligns a respective sheet 15, preferably in relation to the transport direction, before its front edge reaches the stop 13. The subsequent fine alignment then takes place after transfer to a further transport device by the front edge of the respective sheet 15 resting against the stop 13. In this case, the sheets 15 are transported by different transport devices 7 during the alignment and the fine alignment.

One or each transport device 7 can be designed with a conveying plane that is inclined relative to the horizontal. Due to the inclination of the conveying plane, a respective sheet 15 can be aligned particularly easily on the stop 13 by using the effect of the downhill force to counteract an undesirable slipping of the sheet 15 on the suction belt. In particular, this can facilitate the alignment of a sheet 15 that is no longer held on the suction belt by suction air.

The transport device 7 with an inclined conveying plane is preferably designed in such a way that it conveys the sheets 15 against the stop 13 when the stop 13 is in the region of its 6 o'clock position in relation to the sheet guiding cylinder 8.1.

The lateral position of a respective sheet 15 can preferably be determined and corrected if necessary. To determine the position of the side edge of a respective sheet 15, a side edge sensor 17 can be provided, which can be arranged at any location along the sheet transport path.

To influence the position of the sheets 15 transversely to the transport direction, a front edge gripper system of a sheet guiding cylinder 8.1, 8.2, 9 can be arranged axially to the respective sheet guiding cylinder 8.1, 8.2, 9 on this. If the position of the sheets 15 transverse to the transport direction needs to be corrected, the control device activates a corresponding actuator and thereby causes the respective leading edge gripper system with a sheet 15 fixed by it to be displaced in the axial direction of the sheet guiding cylinder 8.1, 8.2, 9.

The formation of a displaceably mounted leading edge gripper system is preferably provided on the second sheet guiding cylinder 8.2 after the last transport device 7 viewed in the transport direction.

In order to influence the position of the sheets 15 transversely to the transport direction, a transport device 7 or parts thereof can also be mounted so as to be displaceable transversely to the transport direction. The transport device 7 can comprise a frame 18 and at least one peripherally mounted suction belt held by the frame 18, the frame 18 being mounted so as to be displaceable transversely to the transport direction of the sheet guiding system. Front and rear deflection rollers 19 carrying a suction belt and a suction box 20 can be arranged on the frame 18 . A plurality of motor-driven suction belts arranged next to one another or a plurality of motor-driven rollers arranged next to one another can also be mounted on the frame 18 . The drive motor 12 designed to drive the deflection rollers 19 is preferably also mounted on the frame 18 . A second actuator 11 preferably acts on the frame 18 . The second actuator 11 is controlled by a control device for correcting the lateral position of the sheets 15 as a function of the signals from the side edge sensor 17 and, if necessary, causes an axial displacement of the frame 18 while one or more suction belts mounted on the frame 18 via deflection rollers 19 pull a respective sheet 15 fix and transport fixed in transport direction. The movement transverse to the transport direction is thus superimposed on a movement of the respective sheet 15 . The lateral alignment of the sheets 15 transported by the transport device 7 can also be effected in a simple manner by forming a side ruler or a side stop in connection with a permanent inclined position of the suction belts. The suction belts are inclined in such a way that sheets 15 transported by them, in addition to a movement in the transport direction, are always conveyed with a comparatively small movement component transversely to the transport direction against the side guide or the side stop.

The inclined position of a respective sheet 15 can preferably also be determined and, if necessary, corrected.

A further sensor 16 can be provided to detect the position of the sheets 15 at an angle to the transport direction. The other sensor 16 can be part of a pair of sensors that the position of a respective sheet 15 detected in the transport direction of the sheet guiding system. In the case of the embodiment as a pair of sensors, the sensors 16 are arranged at a distance from one another on a straight line extending transversely to the transport direction. The inclined position of a respective sheet 15 can be determined by evaluating the chronological sequence with which the leading edge of a respective sheet 15 moving in the transport direction is detected by the two sensors 16 .

To correct the skew of a respective sheet 15, it can be provided that the sheet guiding belts, in particular the suction belts of the transport device 7, rotate at least at times at different speeds. For this purpose, the signals from one or more sensors 16 for detecting the inclined position are fed to the control device, evaluated by the control device and corresponding adjustment commands are forwarded to the drives of the sheet guiding belts, in particular the suction belts, for conversion.

To correct the skewing of a respective sheet 15, it can also be provided that a transport device 7 is formed with a frame 18 in which at least one suction belt is mounted in a circumferential manner.

Front and rear deflection rollers 19 carrying a suction belt and a suction box 20 can be arranged on the frame 18 . A plurality of motor-driven suction belts arranged next to one another or a plurality of motor-driven rollers arranged next to one another can also be mounted on the frame 18 . The drive motor 12 designed to drive the deflection rollers 19 is preferably also mounted on the frame 18 . A first actuator 10 preferably acts on the frame 18 . The frame 18 is preferably pivotably mounted with respect to the transport direction of the sheet guiding system. The first actuator 10 , which is controlled by the control device as a function of the signals from one or more sensors 16 , serves to implement a pivoting movement.

Suction air is preferably used to fix the sheets 15 to a sheet guide belt. The suction air can be applied statically or oscillating to fix the sheets 15.

In order to influence the transport speed of sheets 15 on one of the suction belts carried by the frame 18, the drive motor 12 can be controlled by the control device, in particular as a function of the signal from the sensor 16.

Reference List

1

Stack, stack of sheets

2

stack carrier

3

sheet separator

4

pair of rollers

5

pair of rollers

6

Conveyor belt, belt table

7

transport device

8.1

sheet guiding cylinder

8.2

sheet guiding cylinder

9

sheet guiding cylinder

10

first actor

11

second actor

12

drive motor

13

attack

14

strap, chain

15

arc

16

sensor

17

side edge sensor

18

frame

19

idler pulley, idler wheel

20

suction box

21

means of acceleration

22

means of acceleration

Claims (8)

Sheet processing machine with a sheet separator (3) for separating sheets (15) from a stack (1), a sheet guiding system in the form of a sheet guiding cylinder (8.1, 8.2, 9) or a sheet guiding belt, an acceleration device for accelerating sheets (15) at least a transport speed of the sheet guiding system (8.1, 8.2, 9), a first alignment device which has a stop (13) rotating at the transport speed of the sheet guiding system (8.1, 8.2, 9), the stop (13) of a transport device (7) with a assigned to a flat transport area for conveying sheets (15) at a speed that is higher than the transport speed of the sheet guiding system (8.1, 8.2, 9) and the stop (13) in the transport area of the transport device (7) is guided in a translatory manner, at least in some areas, and the transport device Device (7) conveys the sheets (15) against the stop (13), wherein the sheet guiding cylinder (8.1, 8.2, 9) has a leading edge gripper system and the sheet guiding cylinder (8.1, 8.2, 9) has one or more sheet guiding cylinders (8.2 , 9) are arranged downstream and at least one front edge gripper system is arranged on the respective sheet guiding cylinder (8.1, 8.2, 9) so that it can be displaced axially, a side edge sensor (17) being provided for detecting the position of the side edge of sheets (15) and a control device which for correcting the lateral position of the sheets (15) as a function of the signals from the side edge sensor (17) controls an actuator for displacing a front edge gripper system of a sheet guiding cylinder (8.1, 8.2, 9). sheet processing machine claim 1 , having a sensor (16) for detecting the position of a sheet (15) in a transport direction of the sheet guiding system (8.1, 8.2, 9) and a second aligning device, the second aligning device counterbalancing the transport device (7) for conveying a sheet (15). comprises the revolving stop (13) and a control device, the control device for controlling the transport speed of the transport device (7) depending on the values detected by the sensor (16) and values representing the position of the stop (13) being designed in such a way that the Front edge of a respective sheet (15) is aligned in motion on the stop (13). sheet processing machine claim 1 or 2 , wherein the sheet separator (3) and/or the acceleration device is controlled in such a way that a sheet gap is formed between two consecutive sheets (15) in the transport direction of the sheet guiding system (8.1, 8.2, 9). sheet processing machine claim 1 , 2 or 3 , wherein the acceleration device comprises a pair of rollers (4, 5) and/or a belt table (6). sheet processing machine claim 1 , 2 , 3 or 4 , wherein the stop (13) is assigned to a belt 14 or a chain 14 and the belt 14 or the chain 14 runs over a rear and a front deflection wheel 19 or deflection roller 19. sheet processing machine claim 1 , 2 , 3 , 4 or 5 wherein the transport device (7) comprises a belt table (6) with motor-driven suction belts arranged next to one another. sheet processing machine claim 6 , with a further sensor (16) for detecting the inclined position of sheets (15), the control device for correcting the inclined position of the sheets (15) controlling the movement of the suction belts differently depending on the signals from the further sensor (16). sheet processing machine claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , wherein the sheet guiding cylinder (8.1, 8.2, 9) has a leading edge gripper system and is arranged immediately downstream of the transport device (7).

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