Sheet processing machine

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 the bow (15) to at least a transport speed of the bow guidance system (8.1, 8.2, 9), an alignment device formed by a stop (13) arranged on the bow guide system (8.1, 8.2, 9), with a transport device (7) with a conveying plane inclined to the horizontal, which conveys sheets (15) at a speed increased compared to the transport speed of the sheet guide system (8.1, 8.2, 9) against the rotating stop (13), wherein the sheet separator (3) and / or the acceleration device is controlled such that a sheet gap is formed between two successive sheets (15) in the transport direction of the transport device (7), wherein the acceleration device and / or the transport device (7) comprises a belt table (6) with adjacent, motor-driven suction belts and with a further sensor (16) for detecting the inclination of sheets (15), wherein a control device for correcting the inclination of the sheets (15) controls the movement of the suction belts differently depending on the signals of the further sensor (16).

Description

[0001] The invention relates to a sheet-processing machine with an acceleration device and an alignment device.

[0002] Material is typically fed to sheet-processing machines in a shingled stream. The advantage of this solution is that the average velocity of the shingled stream is low, which simplifies sheet alignment at the sheet feeder.

[0003] The disadvantage of this method is that the sheet is first separated and accelerated, then decelerated again at the machine, only to be accelerated back to production speed within one sheet cycle.

[0004] WO 02 / 048 011 A1 describes a device for aligning sheets on a sheet-fed printing press. A shingle device is positioned upstream of the sheet alignment device, generating a shingle stream of sheets. The device comprises suction rollers on which leading edges are arranged. The leading edges of individual sheets in the shingle stream are successively fed against these leading edges. The sheets are fed against the leading edges at a relative speed, so that the leading edge of each sheet is aligned by deceleration against the leading edges.

[0005] EP 0 947 455 A1 describes a device for the precise positioning of flat materials for a machining process, in which several alignment elements are actuated by sensors arranged in series. Lateral alignment is achieved by a lateral movement of the material perpendicular to the transport direction. Longitudinal alignment is accomplished by an accelerated or decelerated longitudinal movement in the transport direction. When correcting the position or orientation of the material, it does not encounter a stop or similar object; rather, the flat material is subjected to a drive force or torque that causes the rotational movement, lateral alignment, or acceleration / deceleration. During alignment, the materials are arranged in series in a horizontal position and are transported by a conveying device.

[0006] DE 10 2009 046 089 A1 discloses the sheet feeder of a sheet processing machine comprising a sheet separator and a conveyor belt, followed by an alignment unit. The alignment unit includes independently driven alignment wheels. The conveyor belt's transport speed is controlled by a measurement signal from a sheet arrival sensor. No stop is used for singulating and aligning the sheets. The sheets are transported at intervals, decelerated to a standstill after alignment, and fixed in a transfer position.

[0007] From EP 0 120 348 A2, a device and a method for aligning sheets are known. The leading edge of the sheets is aligned by feeding the sheets, which are supplied to the device in a shingled pattern, to an alignment cylinder within the device at a conveying speed that is at least slightly greater than the circumferential speed of the alignment cylinder. Lead marks are arranged on the circumference of the alignment cylinder, against which the leading edge of the sheets can be brought into contact. Due to the relative speeds between the sheets and the lead marks, the leading edge of the sheets is at least slightly decelerated against the lead marks, thereby aligning the leading edge of the sheets.After the leading edge of the sheet is aligned, the sheet is fixed to a suction bar by applying a vacuum along the leading edge. This causes the sheet to wrap around the circumference of the alignment cylinder due to its continuous rotary drive. Following alignment of the leading edge and before the sheet is transferred to a downstream device, the lateral offset of one of the sheet's side edges is measured using a measuring device. Based on this measurement, the suction bar, to which the leading edge is fixed, is adjusted linearly along the axis of rotation of the alignment cylinder to align the sheet's side edge to the desired target position.As a result, the sheet can be transferred to a downstream device, for example a sheet-fed printing press, in the correct orientation both with respect to the leading edge and with respect to a side edge.

[0008] From DE 23 13 150 C3, a device for feeding sheets to a sheet-fed rotary printing press is known, in which the sheets are conveyed in a shingled fashion on a feed table towards and away from the device. For conveying the sheets, which lie flat on the feed table, the use of suction rollers is described, the rollers having recesses around their entire circumference. By applying a vacuum, the sheet can be fixed to the circumference of the suction roller. The suction roller is arranged in a recess of the feed table such that the sheets can be driven while lying flat on the feed table and tangentially against the circumference of the suction roller. This ensures that the sheets only come into contact with the suction roller in a linear contact area, whereby the driving forces are transmitted from the suction roller to the sheet by friction in this linear contact area.Therefore, it is not necessary for the suction rollers to be wrapped around the bows.

[0009] From WO 97 / 35 795 A1, a device with a suction drum is known, to the circumference of which the sheets to be transported can be frictionally fixed by applying a vacuum. The drive of the suction drum is designed such that the speed and / or the angle of rotation of the suction drum can be controlled by an independent electric motor according to predetermined motion laws.

[0010] From DE 20 46 602 A, a sheet feeder for printing presses is known in which the lateral offset of a sheet's edge relative to a target alignment can be determined using a measuring device. To align the sheet's edge, an alignment cylinder, to whose circumference the sheet is fixed, can be adjusted axially in the direction of its axis of rotation, depending on the measurement result.

[0011] From EP 07 16 287 A2 a non-contact device for measuring the position of arcs is known, in which the side edges of the arcs can be measured by means of an optical system.

[0012] DE 10 2009 008 781 A1 discloses a device for aligning sheets against stops in a printing press, which is arranged at the end of a feed table, wherein the stops are arranged on an alignment cylinder and the sheets are conveyed to the stops at a predetermined speed. The stops perform a translational movement.

[0013] US Patent 2006 / 0202407A1 relates to an image-generating device with a cassette from which a sheet is fed by an intermediate roller against a register roller. The register roller includes a section where the leading edge of a sheet fed by the intermediate roller is aligned while the register roller is stationary.

[0014] EP 1 219 556 B1 discloses a device for producing a printed product with a digital printing unit, which is connected to an upstream device for feeding sheets. Downstream of the conveying end of the first conveying device is a second conveying device, which effectively delivers the sheets stacked one on top of the other in a collecting device and operates in the same direction as the first conveying device.

[0015] US 2001 / 0022422A1 describes a device for conveying bows and a device for generating images.

[0016] The invention is based on the objective of creating a sheet-processing machine with an alignment device that enables precise sheet placement even at high machine speeds.

[0017] According to the invention, the problem is solved by a sheet-processing machine with the features of independent claims 1 and 2. Advantageous embodiments are described in the dependent claims, the description, and the figures.

[0018] The advantages achievable with the invention consist in particular in that sheets are separated from a stack, accelerated to machine speed, and transferred to the processing units or processing elements of the sheet-processing machine, with the alignment of the sheets occurring during movement. It is particularly advantageous that, due to the arrangement of several acceleration devices, the acceleration devices are subjected to only minor mechanical stresses because of the comparatively small decelerations or accelerations.

[0019] The associated figures show Fig. 1 Details of a sheet processing machine with a single-stage acceleration device, Fig. 2 Details of a sheet processing machine with a two-stage acceleration device, Fig. 3 Details of a sheet-processing machine with an acceleration device and an inclined transport device, Fig. 4 a movable transport device, Fig. 5. Schematic details of a sheet-processing machine with a rotating stop, Fig. 6 Details of an acceleration device.

[0020] According to one embodiment, the sheet-processing machine can have a feeder, a delivery unit, and one or more offset printing units and / or coating units and / or non-impact printing units, in particular inkjet printing units, arranged between the feeder and the delivery unit. Preferably, each offset printing unit and / or each coating unit comprises at least one sheet guide cylinder 9 which has a gripper system for gripping the leading edges of the sheets.

[0021] An offset printing unit preferably comprises a sheet guide cylinder 8.1, 8.2, 9 designed as a printing cylinder, a blanket cylinder, and a plate cylinder interacting with the blanket cylinder. Each plate cylinder is assigned an inking unit for inking a printing plate that can be fixed to the plate cylinder, and preferably, but not necessarily, a dampening unit. Each coating unit preferably comprises a plate cylinder directly associated with the printing cylinder, which has means for clamping a coating plate. The non-impact printing units can have one or more sheet guide cylinders 8.1, 8.2, 9 with gripper systems for gripping the sheet leading edges, as well as one or more non-impact printing devices, in particular inkjet printing units, assigned to one or more of the cylinders.

[0022] Instead of the sheet guide 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, to which a non-impact printing device is assigned.

[0023] The display preferably includes a chain conveyor system. It can have chains circulating over 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.

[0024] The feeder preferably comprises a stacking chamber with a stacking support 2, in particular a stacking support plate, which can be vertically moved by means of a lifting system with a stack of sheets 1 that can be positioned on the stacking support 2. A sheet separator 3 is provided for separating the sheets 15, which are present as a stack of sheets 1, and which is preferably arranged above the stacking support plate in the stacking chamber.

[0025] The sheet separator 3 can be configured as a leading-edge separator or a trailing-edge separator in a manner known per se and can include lifting suction cups and trailing suction cups. The lifting suction cups lift the uppermost sheet 15 of the sheet stack 1 from it and preferably transfer it to the trailing suction cups for further transport towards the sheet guide cylinders 8.1, 8.2, 9. The separation of the uppermost sheet 15 from the sheet stack 1 can be assisted by compressed air from separating blowers (not shown) or by compressed air from a push-button base (also not shown).

[0026] An acceleration device is arranged downstream of the sheet separator 3 in one transport direction of the sheet-processing machine. The acceleration device can be formed by a pair of rollers 4, consisting of a lower roller and a indexing roller that is associated with the lower roller in the machine cycle of the sheet-processing machine. The indexing roller can be driven by a piezoelectric actuator for its displacement. The lower roller can be accelerated to the transport speed of the sheet guide system, which can be designed as a sheet guide cylinder 8.1, 8.2, 9 or a sheet guide belt. The indexing roller is preferably mounted to rotate freely on a roller lever and, when pivoting towards the lower roller, brings a sheet 15 located between the lower and the indexing 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 greater than the transport speed of the sheet guide system. The suction cup can be part of the acceleration device and transports each sheet 15 into the gap formed between the lower roller and the indexing roller. Instead of the pair of lower roller and indexing roller, or downstream of it, a pair of rollers 5 can also be arranged, consisting of two cooperating rollers that always rotate at the same speed. Likewise, a suction belt can be arranged instead of the pair of rollers 5. 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 each individually form an acceleration device.The acceleration device can also be formed by several of the aforementioned elements, roller pair 4, roller pair 5 or the suction belt, and in this case preferably functions in multiple stages, such that the speed of the elements connected in series in the transport direction of the sheet processing machine increases.

[0027] In a preferred embodiment, the acceleration device comprises at least two acceleration means 21, 22 arranged side by side for accelerating the sheets 15. Preferably, several first and second acceleration means 21, 22 are arranged alternately, 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 indexing rollers, or in another suitable manner. The suction belts 6 are preferably designed as endless, circulating belts perforated by suction openings and having an acceleration section. In the region of the acceleration section, the suction belts 6 are associated with a suction box 20 such 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 vacuum spreads through the suction openings in the suction box 20 and the suction openings in the suction belts 6, causing the undersides of the sheets 15 to be fixed in place when they enter the area of ​​effect of the suction air. Preferably, instead of a pure suction air source, an air source can also be provided that is switchable between a suction air supply and a blowing air supply.

[0028] If the accelerators 21, 22 are designed as suction rollers, an air source can also be provided that is switchable between a suction air supply and a blowing air supply. In this case, the air source is not associated with the suction box 20. Preferably, the suction air is generated from blowing air via an ejector action and supplied directly at the point of action. Thus, it is possible to generate an oscillating vacuum via rotary valves so that the sheet 15 can be moved slightly on the suction belt, for example, to achieve lateral alignment. The first or several first accelerators 21 and the second or several second accelerators 22 are driven discontinuously in rotation according to a predetermined velocity-time law. The first or several first accelerators 21 are driven out of phase with the second or several second accelerators 22.The phase offset corresponds at least approximately to the rate at which the bow guidance system 8.1, 8.2, 9 promotes bow 15.

[0029] The at least one first and at least one second accelerator means 21, 22 preferably act alternately on the sheets 15 of a sheet sequence. In other words, with respect to a machine cycle of 360 degrees per sheet 15, 720 degrees are available for acceleration and deceleration for each accelerator means 21, 22, with 360 degrees allocated to acceleration and 360 degrees to deceleration. The resulting accelerations and decelerations of the accelerator means 21, 22 are reduced to one-quarter compared to a non-alternating drive mode.

[0030] The velocity-time law for driving the acceleration means 21, 22 includes in particular a minimum velocity or a minimum velocity range equal to zero, near zero or equal to the transport velocity of the sheet separator 3 in the transport direction and a maximum velocity or a maximum velocity range equal to the transport velocity of the sheet guiding system in the form of a sheet guiding cylinder 8.1, 8.2, 9 or a sheet guiding belt.

[0031] According to one embodiment, each first and each second accelerator 21, 22 has its own drive. Likewise, all first accelerators 21 can have a common first drive, and all second accelerators 22 can have a further common second drive independent of the drive of the first accelerators 21. According to another embodiment, several velocity-time laws relating to at least one of the processing parameters format, printing speed, or substrate can also be stored in a memory and entered into the drives of the accelerators 21, 22 by a controller.

[0032] To determine the extent to which certain processing parameters are present in a specific case, sensors can be used whose signals are fed to the control of the drives.

[0033] Preferably, a control system is provided for switching the suction air supply and / or the blowing air supply. The control system controls the suction air supply and / or the blowing air supply in accordance with the velocity-time law implemented for the accelerators 21, 22.

[0034] Preferably, the sheet separator 3 and / or the elements of the acceleration device are designed or controlled such that a sheet gap is formed between two successive sheets 15 when viewed in the transport direction. This results in a sheetless, and in particular a single-sheet, system, unlike the shingled flow that is typical, especially in conventional printing presses.

[0035] Preferably one or two transport devices 7 are arranged downstream of the acceleration device in the transport direction of the sheet processing machine.

[0036] The or each transport device 7 can comprise a belt table 6 with adjacent, motor-driven suction belts or a pair of rollers 4, 5.

[0037] After the last transport device 7, viewed in the transport direction of the sheet processing machine, a sheet guiding system is preferably designed in the form of a sheet guiding cylinder 8.1, 8.2, 9 or a sheet guiding belt.

[0038] To align the sheets 15, a rotating stop 13 is incorporated into 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.

[0039] The circumferential stop 13 can be part of a first alignment device or form a first alignment device.

[0040] According to one embodiment, the circumferential stop 13 can also be part of the sheet guide system; in particular, the sheet guide cylinder 8.1, 8.2, 9 can have a leading-edge gripper system that forms or comprises the stop 13. If the leading-edge gripper system of a sheet guide cylinder 8.1, 8.2, 9 forms the stop 13, one or more additional sensors arranged in the area of ​​the sheet guide cylinder 8.1, 8.2, 9 can 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.

[0041] The stop 13 can also be designed without a mechanical connection to the bow guidance system. For this purpose, the stop 13 can be associated with a belt 14 or a chain 14, wherein the belt 14 or the chain 14 preferably runs over a rear and a front deflection pulley.

[0042] In the case of assignment to a bow guide 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 translationally in certain areas.

[0043] Accordingly, the stop 13 can be assigned to a transport device 7 with a flat transport area for conveying sheets 15, wherein the stop 13 is guided translationally at least in part in the transport area of ​​the transport device 7 and the transport device 7 conveys the sheets 15 against the stop 13.

[0044] The stop 13 preferably serves for the fine alignment of sheets 15. The stop 13 achieves its effect by conveying each sheet 15 to be aligned by a transport device 7 at a transport speed greater than the speed of the stop 13. Due to the relative speeds between the sheet 15 and the stop 13, the leading edge of the sheet 15 is at least slightly decelerated against the stop 13, thereby aligning the leading edge. After the leading edge of the sheet 15 has been aligned, the sheet 15 is preferably fixed in the leading edge region by closing a leading edge gripper system of a sheet guide cylinder 8.1, 8.2, 9 or by applying a vacuum to a suction bar or a sheet guide belt designed as a suction belt.The transport speed of the transport device 7 within the effective range of the stop 13 can be predetermined by a mechanical connection between the drive acting on the stop 13 and the drive of the transport device 7. 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 its input side. Depending on the type and design of the drive, a transport device 7 can also be part of a second alignment device.

[0045] For this purpose, preferably at least one sensor 16 is provided for detecting the position of a bow 15 in a transport direction of the bow guidance system, which can be arranged at any point along the bow transport path.

[0046] According to an embodiment in which the transport speed of a transport device 7 conveying 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 is designed as a function of the values ​​detected by the sensor 16 and the values ​​representing the position of the stop 13 such that the leading edge of a respective sheet 15 in motion is aligned by contact with the stop 13.

[0047] The transport device 7 aligns each sheet 15, preferably with respect to the transport direction, before its leading edge reaches the stop 13. The subsequent fine alignment is then achieved by resting the leading edge of the respective sheet 15 against the stop 13. In this case, both the alignment and the fine alignment are performed by one and the same transport device 7.

[0048] According to one embodiment in which the transport speed of a transport device 7, which conveys a sheet 15 not directly against the stop 13, is controlled, the control device for controlling the transport speed of at least one transport device 7 is designed, depending on the values ​​detected by the sensor 16 and the values ​​representing the position of the stop 13, such that the leading edge of each sheet 15 is aligned in motion without contact with the stop 13. The transport device 7 preferably aligns each sheet 15 with respect to the transport direction before its leading edge reaches the stop 13. The subsequent fine alignment then takes place after transfer to another transport device by resting the leading edge of the respective sheet 15 against the stop 13.During alignment and fine alignment, the arcs 15 are transported in this case by different transport devices 7.

[0049] Each or every transport device 7 can be designed with a conveying surface inclined relative to the horizontal. The inclination of the conveying surface makes it particularly easy to align a given arc 15 against the stop 13 by utilizing the force of gravity acting down the slope to counteract unwanted slippage of the arc 15 on the suction belt. This can be especially helpful in aligning an arc 15 that is no longer held in place on the suction belt by suction air.

[0050] The transport device 7 with an inclined conveying plane is preferably designed such that it conveys the sheets 15 against the stop 13 when the stop 13 is in the area of ​​the 6 o'clock position with respect to the sheet guide cylinder 8.1.

[0051] The lateral position of each sheet 15 can preferably be determined and corrected if necessary. A side edge sensor 17 can be provided to determine the position of the side edge of each sheet 15; this sensor can be positioned at any point along the sheet transport path.

[0052] To influence the position of the sheets 15 transversely to the transport direction, a leading-edge gripper system of a sheet guide cylinder 8.1, 8.2, 9 can be arranged to be axially displaceable on the respective sheet guide cylinder 8.1, 8.2, 9. If a correction of the position of the sheets 15 transversely to the transport direction is required, the control device activates a corresponding actuator, thereby causing a displacement of the respective leading-edge gripper system with a sheet 15 fixed by it in the axial direction of the sheet guide cylinder 8.1, 8.2, 9.

[0053] The formation of a slidably mounted leading edge gripper system is preferably provided on the second arc guide cylinder 8.2 after the last transport device 7 viewed in the transport direction.

[0054] To influence the position of the sheets 15 transversely to the transport direction, a transport device 7 or parts thereof can also be provided with a mounting that is displaceable transversely to the transport direction. The transport device 7 can comprise a frame 18 and at least one circumferentially mounted suction belt held by the frame 18, the frame 18 being displaceably mounted transversely to the transport direction of the sheet guide system. Front and rear deflection rollers 19, which carry a suction belt, and a suction box 20 can be arranged on the frame 18. Several motor-driven suction belts arranged side by side or several motor-driven rollers arranged side by side 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 engages the frame 18.The second actuator 11 is controlled by a control device to correct the lateral position of the sheets 15 depending on 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 fix a respective sheet 15 and transport it in the direction of transport. This superimposes the movement perpendicular to the direction of transport on the movement of the respective sheet 15. The lateral alignment of the sheets 15 transported by the transport device 7 can also be achieved simply by the design of a side guide or a side stop in conjunction with a permanent inclination of the suction belts.The suction belts are inclined in such a way that the sheets 15 transported by them are always conveyed with a comparatively small movement component perpendicular to the transport direction against the side ruler or the side stop, in addition to a movement in the transport direction.

[0055] Preferably, the inclination of each arc 15 can also be determined and corrected if necessary.

[0056] To detect the position of the sheets 15 at an angle to the transport direction, an additional sensor 16 can be provided. This additional sensor 16 can be part of a sensor pair that also detects the position of each sheet 15 in the transport direction of the sheet guide system. When configured as a sensor pair, the sensors 16 are arranged at a distance from each other on a straight line extending transversely to the transport direction. The angle of each sheet 15 can be determined by evaluating the temporal sequence in which the leading edge of each sheet 15 moving in the transport direction is detected by the two sensors 16.

[0057] To correct the tilt of a given sheet 15, it may be provided that the sheet guide belts, in particular the suction belts of the transport device 7, are rotated at different speeds, at least temporarily. For this purpose, the signals from one or more sensors 16 for detecting the tilt are transmitted to the control device, evaluated by the control device, and corresponding control commands are forwarded to the drives of the sheet guide belts, in particular the suction belts, for implementation.

[0058] To correct the tilt of a respective arc 15, it may also be provided to design a transport device 7 with a frame 18 in which at least one suction belt is mounted circumferentially.

[0059] The frame 18 can accommodate front and rear deflection rollers 19, which carry a suction belt, and a suction box 20. The frame 18 can also accommodate several adjacent, motor-driven suction belts or several adjacent, motor-driven rollers. The drive motor 12, which drives the deflection rollers 19, is preferably also mounted on the frame 18. A first actuator 10 preferably engages the frame 18. The frame 18 is preferably pivotably mounted with respect to the transport direction of the sheet guide system. The first actuator 10, which is controlled by the control device based on signals from one or more sensors 16, serves to implement a pivoting movement.

[0060] Preferably, suction air is used to fix the sheets 15 to a sheet guide belt. The suction air can be applied statically or oscillatingly to fix the sheets 15.

[0061] To influence the transport speed of sheet 15 on one of the suction belts carried by the frame 18, the drive motor 12 can be controlled by the control unit, in particular depending on the signal from the sensor 16. Reference symbol list 1 stack, stack of sheets 2 stacking carriers 3 sheet separators 4 pairs of rollers 5 pairs of rollers 6 Conveyor belt, belt table 7 Transport device 8.1 Bow guide cylinder 8.2 Bow guide cylinder 9 arc guide cylinders 10 first actuator 11 second actor 12 Drive motor 13 attacks 14 belts, chain 15 sheets 16 Sensor 17 Side edge sensor 18 frame 19 Deflection pulley, deflection wheel 20 suction boxes 21 Accelerating agents 22 accelerants

Claims

[1] 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 the bow (15) to at least a transport speed of the bow guidance system (8.1, 8.2, 9), an alignment device formed by a stop (13) arranged on the bow guide system (8.1, 8.2, 9), with a transport device (7) with a conveying plane inclined to the horizontal, which conveys sheets (15) at a speed increased compared to the transport speed of the sheet guide system (8.1, 8.2, 9) against the rotating stop (13), wherein the sheet separator (3) and / or the acceleration device is controlled such that a sheet gap is formed between two successive sheets (15) in the transport direction of the transport device (7), wherein the acceleration device and / or the transport device (7) comprises a belt table (6) with adjacent, motor-driven suction belts and with a further sensor (16) for detecting the inclination of sheets (15), wherein a control device for correcting the inclination of the sheets (15) controls the movement of the suction belts differently depending on the signals of the further sensor (16). [2] 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 the bow (15) to at least a transport speed of the bow guidance system (8.1, 8.2, 9), an alignment device formed by a stop (13) arranged on the bow guide system (8.1, 8.2, 9), with a transport device (7) with a conveying plane inclined to the horizontal, which conveys sheets (15) at a speed increased compared to the transport speed of the sheet guide system (8.1, 8.2, 9) against the rotating stop (13), wherein the sheet separator (3) and / or the acceleration device is controlled such that a sheet gap is formed between two successive sheets (15) in the transport direction of the transport device (7), wherein one or more sheet guide cylinders (8.2, 9) having at least one leading edge gripper system are arranged downstream of the sheet guide cylinder (8.1, 8.2, 9) and at least one leading edge gripper system is arranged axially displaceable on the respective sheet guide cylinder (8.1, 8.2, 9), wherein a side edge sensor (17) is provided for detecting the position of the side edge of sheets (15) and wherein a control device for correcting the side position of the sheets (15) depending on the signals of the side edge sensor (17) controls an actuator for relocating a leading edge gripper system of a sheet guide cylinder (8.1, 8.2, 9). [3] Sheet processing machine according to claim 1 or 2, comprising a sensor (16) for detecting the position of a sheet (15) in a transport direction of the sheet guide system (8.1, 8.2, 9) and a control device, wherein the control device is designed to control the transport speed of the transport device (7) depending on the values ​​detected by the sensor (16) and on the values ​​representing the position of the stop (13). [4] Sheet processing machine according to claim 1, 2 or 3, wherein a control device for controlling the transport speed of the transport device (7) is designed such that the leading edge of each sheet (15) is aligned in motion against the stop (13). [5] Sheet processing machine according to claim 1, 2, 3 or 4, wherein the transport device (7) is designed such that it conveys sheets (15) against the stop (13) when the stop (13) is in the region of the 6 o'clock position with respect to the sheet guide cylinder (8.1). [6] Sheet processing machine according to claim 1, 2, 3, 4 or 5, with a device for detecting the sheet length and / or the sheet width and / or the sheet thickness. [7] Sheet processing machine according to claim 1, 2, 3, 4, 5 or 6, wherein the acceleration device and / or the alignment device and / or the sheet guide cylinder (8.1, 8.2, 9) each have a drive independent of the other drives of the sheet processing machine.

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