Braking station for a sheet brake in the delivery of a sheet-processing machine

Abstract

Braking station (6) for a sheet brake (5) in the delivery of a sheet processing machine, wherein the brake station (6) includes a connection surface (14), wherein interchangeable functional units (16) can be assigned to the connection surface (14), wherein at least one position securing element (28) is provided for securing the position of a functional unit (16) on the connection surface (14), wherein the position locking element (28) has an air guide channel (29), wherein the position locking element (28) is designed as a position locking bolt (28), wherein a functional unit (16) has two position locking bolts (28) and one or both position locking bolts (28) are pneumatically coupled to a suction air channel (23) and / or a suction air bore (24) of the functional unit (16) and wherein the connection surface (14) has two spaced-apart bores (30) which correspond to position locking bolts (28) of the respective functional unit (16).

Description

[0001] The invention relates to a braking station for a sheet brake in the delivery of a sheet-processing machine.

[0002] From DE 101 03 235 A1, a boom for a sheet-fed printing machine, in particular a rotary printing press, is known, in which a sheet brake constructed from modules has a pin with a circumferential groove projecting beyond a cover plate at a conical end for locking a pivot connection. This pin engages in an opening in a spring-loaded leaf spring on the support module, similar to a bayonet fitting. The pneumatic supply is provided by the adjacent surfaces. A disadvantage of this solution is that it is complex and prone to powder buildup.

[0003] From DE 10 2004 030 277 A1, a method for conveying sheets through a printing press and a device for carrying out the method are known, wherein an interchangeable suction channel insert can be assigned to a suction table. The suction table has a support surface and a groove on its upper side into which the suction channel insert is placed. On the underside of the suction channel inserts is a locating bore for receiving a dowel pin located in the suction table. A retaining magnet secures the insert in place. A suction channel insert is intended to seal against the surface of the groove. A disadvantage of this solution is that, in addition to the aligned suction channels, further dowel pins and retaining magnets are required. Powder deposits, in particular, regularly prevent a sealing seal between the suction channel inserts and the suction table.

[0004] From DE 10 2010 002 500 A1, a device for handling, namely for guiding and / or braking, sheets in a sheet-processing machine is known, in which the electrical and / or pneumatic energy required by a base module and an adapter module is supplied via the base module. For this purpose, an adapter module has a U-shaped recess in cross-section that can be hooked onto the shaft of a fastening screw. By tightening the fastening screw on the base body, the adapter module can be clamped to the base module. A disadvantage of this solution is that the adapter module must be hooked onto a screw via a recess. Due to the concealed openings of the pneumatic connection, checking the correct alignment is not possible. Furthermore, a tight seal cannot always be guaranteed in the case of powder deposits.

[0005] From DE 10 2011 080 196 A1, a delivery unit of a sheet processing machine with a sheet brake is known, wherein a sheet brake station contains a support element which has an upper connection surface that is at least approximately horizontal, to which various functional units can be interchangeably assigned via connection points depending on the requirements, and wherein at least one suction air connection is assigned to the support element.

[0006] EP 1 764 328 A2 discloses a delivery device in an offset sheet-fed printing press, comprising several suction units arranged above a stacking plate on an upstream sheet conveying direction side, below a conveyed sheet, in a direction along the width of the sheet, and which draw the conveyed sheet towards themselves by means of suction in a slidable contact with it.

[0007] DE 40 17 147 A1 shows a suction belt conveyor in the delivery area of ​​printing presses, wherein hollow nubs are arranged on the circumference of a deflection roller, which are provided with a suction bore and the nubs are positively engaged with suction openings of a suction belt.

[0008] US Patent 3,972,523 A shows a bow brake in which a vacuum required at suction openings is generated at each suction opening by means of an air jet pump pressurized with compressed air.

[0009] DE 195 10 364 A1 discloses a device for processing sheet layers or the like, wherein at least one additional surface adjacent to the passage is provided within a passage envelope of at least one control passage for a fluid in the area of ​​a control surface.

[0010] The invention is therefore based on the objective of creating an alternative sheet brake. In particular, a more reliable sheet brake is to be created, which can further improve the sheet placement process in the delivery unit of a sheet-processing machine.

[0011] According to the invention, the problem is solved by a device with the features of the independent device claim. Advantageous embodiments are described in the dependent claims, the description, and the drawings.

[0012] The invention has the advantage of providing an alternative sheet brake. In particular, it provides a more reliable sheet brake, which further improves the sheet placement process in the delivery unit of a sheet-processing machine.

[0013] In one embodiment, the number of connection points between a base body or a support element of the brake unit and a functional unit, for example a suction strip, is advantageously reduced. The process of replacing the suction strip can be further simplified.

[0014] The locking element is designed as a locking bolt, which may be hollow to create a pneumatic connection, particularly for supplying suction air to the functional unit. Preferably, the upper edge of the functional unit, especially a suction bar, is continuous, i.e., without a step.

[0015] In a preferred embodiment, at least one lateral boundary of a circumferentially guided element is arranged at least flush with the circumferential element in the area of ​​a delivery stack, particularly in the deflection area of ​​the element facing the delivery stack. Preferably, the lateral boundary projects beyond the delivery stack, especially in the deflection area of ​​the element facing the delivery stack. This forms a sheet guide surface or a sliding surface for sheets to be laid down. Particularly preferred are two lateral boundaries, for example, two side walls, arranged such that they are at least flush with the circumferential element, but preferably project beyond it. With such an optimally positioned braking unit, contact between a returning suction belt and the trailing edge of the already falling sheets to be laid down is avoided.

[0016] In a particularly preferred embodiment, a functional unit is designed as a suction bar, which has at least two, preferably exactly two, locking pins that correspond to a corresponding number of bores on a connecting surface of the base body or the support element. The locking pin(s) contain the air guide channels that establish the pneumatic connection with the bore(s). In particular, this allows the supply of suction air and / or blowing air for a rotating element guided by a functional unit. The air guide channel of a locking pin preferably has a round cross-section, but could alternatively have a different cross-section. A locking pin associated with an interchangeable functional unit can be positively and / or frictionally engaged with a bore in the connecting surface.

[0017] A functional unit guiding a circulating element, for example a suction strip, can have a recess or cutout for grasping, removing, and / or replacing the guided element. In particular, recesses can preferably be provided on both sides of lateral guides in the area of, for example, the upstream deflection element, such as a deflection roller or wheel, to facilitate manual grasping of a guided element, such as a suction belt or support belt. A connection surface of the brake station is particularly preferably arranged with an at least approximately horizontal orientation, so that gravity alone secures the position between the functional unit and the connection surface. Further measures can be taken by providing additional position fixing elements between the functional unit and the connection surface.The base body or support element must be provided with the connection surface. The functional units can be easily removed from the horizontal connection surface of the brake station.

[0018] Especially with multiple independently controllable pneumatic connections, particularly suction air connections, a compact design is achieved. The position locking pins or locking elements can be dimensioned accordingly. The rotating element of a functional unit, for example, a brake element or suction belt of a suction strip, can be driven at a constant depositing speed, but is preferably driven discontinuously. In a further development, at least one catch element can be positioned upstream of a brake element, thereby influencing, and in particular improving, the reaction behavior of the sheets to the brake element. In another embodiment, additional energy, for example, electrical energy, can also be supplied between the brake station and the functional unit via the at least one position locking pin.

[0019] The invention will now be explained by way of example. The accompanying drawings schematically illustrate the following: Fig. 1: Sheet brake in the delivery of a sheet-processing machine; Fig. 2: Braking station of a bow brake; Fig. 3: Section of the brake station with suction bar; Fig. 4: Cross-section of the brake station section with a suction strip assigned to a support element; Fig. 5: Perspective view of the section of the brake station with air guide system; Fig. 6: Replaceable suction strip with locking bolt; Fig. 7: Top view of the connection surface of the support element arranged on the base body.

[0020] The Fig. Figure 1 shows, in one embodiment, a section of the delivery unit of a sheet-fed printing machine, in particular a sheet-fed offset rotary printing press, preferably in a modular or in-line configuration. The delivery unit includes a sheet conveying system (not shown) that transports the sheets 1, which have been printed, varnished, processed, etc., in the printing press, to a delivery stack 2. This sheet conveying system is preferably designed as a chain conveying system with two delivery chains, each guided laterally on the frame of the delivery unit, between which gripper carriages 3 are arranged. The gripper carriages 3 contain sheet clamping systems with which the sheets 1 to be transported are gripped at the leading edge. The gripper carriages 3 are guided by the delivery chains on a gripper carriage track in the sheet travel direction (BLR) up to and over the delivery stack 2, where the gripper carriages 3 release the sheets 1 for placement.On the sheet conveyor path to the delivery stack 2, sheet guide plates 4 are preferably arranged in the delivery unit, guiding the sheets 1 on their way to the delivery stack 2. Nozzles for pneumatically guiding the sheets 1 can be assigned to the sheet guide plates 4. The printing press can preferably be configured to switch between single-sided printing and double-sided printing modes. An air cushion can be formed between the sheet guide plates 4 and the sheets 1 being transported over them, particularly in double-sided printing mode.

[0021] In the delivery unit, a sheet brake 5 is arranged upstream of the delivery stack 2 in the sheet travel direction BLR. This brake takes the sheets 1 to be deposited from the gripper carriages 3 and, after their release, decelerates them from machine speed to depositing speed. After deceleration by the sheet brake 5, the sheets 1 are aligned against leading edge stops, trailing edge stops, and / or side edge stops (not shown) and deposited neatly onto the delivery stack 2. The delivery stack 2 is preferably lowered by a stack lift drive (not shown) during the sheet depositing process such that the surface of the delivery stack forms an at least approximately constant depositing level for the incoming sheets 1. The sheet brake 5 comprises at least two stations, which are preferably arranged to be axially displaceable, i.e., transverse to the sheet travel direction BLR, and in particular, to be slidable.However, several such stations can also be used, for example, at least three stations, or exactly three, four, five, or even more depending on the format. The stations are preferably placed on a respective lateral, usually unprinted, edge of the sheet, on unprinted corridors, and / or on sufficiently dried ink areas. Relocation can be done manually or, preferably, by motor. For example, a drive, particularly a spindle drive, can reposition the stations. Alternatively, one, several, or all stations can have their own dedicated drive. Unneeded stations can be deactivated and / or moved out of the sheet area.

[0022] At least one, but preferably several or all, stations can each accommodate at least one braking element, which is rotatable about at least one axis of rotation or mounted circumferentially about several axes of rotation. The braking element preferably interacts pneumatically with the sheets 1 transported via the sheet brake 5. In particular, the sheets 1 are brought into contact with the braking element by suction air and / or held in contact with it, so that contact is established between the braking element and the respective sheet 1. The braking element moves at a speed lower than the machine speed and decelerates each sheet 1 released by the gripper carriage 3 accordingly. The braking element can be assigned at least one drive that drives or decelerates the braking element at a constant or variable speed lower than the machine speed.Preferably, the braking element is operated dynamically and / or periodically between at least approximately machine speed and a lower depositing speed. With multiple braking elements, the drive can also drive or decelerate several or all of the braking elements. Alternatively, each braking element can be assigned a separate drive. In a further development, the braking element, in conjunction with a braking element of another station, exerts a transverse tension on a respective sheet to be deposited by means of an arrangement diverging with respect to the sheet travel direction (BLR).

[0023] The Fig. Figure 2 shows a further embodiment of a braking station 6 of an arc brake 5 in a side view. The braking station 6 here includes, for example, a catching element and, viewed in the arc travel direction BLR, a braking element downstream of it. Both the catching element and the braking element can be designed as elements rotating about one axis of rotation or as elements rotating about several axes of rotation. The catching element, like the braking element, can be pneumatically actuated. The catching element is preferably arranged in alignment with the braking element, so that the catching element and the braking element run together in a pressure-free corridor and / or are positioned on such a corridor. Preferably, the catching element, together with a catching element of another braking station 6, acts transversely on a respective arc 1 to be laid down by means of an arrangement diverging with respect to the arc travel direction BLR.Furthermore, the catching element can be mounted in a tilt-adjustable manner and / or its position can be changed, for example, by being height-adjustable in a clocked manner. The catching element can also have a separate drive, be driven by friction upon arc contact, or interact with a braking device. Here, the catching element is designed, for example, as a rotationally movable suction ring 10.

[0024] The brake station 6 comprises a base body 7, which is arranged on a crossbeam (not shown) extending across the machine width, i.e., transversely to the arc travel direction (BLR). Preferably, the brake station 6 is arranged to be displaceable along this crossbeam, which may be, for example, tubular. A first drive element, preferably operatively connected to a first drive shaft, is associated with the base body 7. This first drive element is preferably configured as a first square shaft drive 8, which is operatively connected to a square shaft (not shown). The brake element associated with the base body 7 can be driven via the first drive element, here the first square shaft drive 8.Preferably, the brake elements assigned to the brake stations 6 of the arc brake 5 are driven jointly by a rotational movement of the drive shaft (not shown) arranged across the machine width, in particular the square shaft.

[0025] The base body 7 is further associated with a second drive element, preferably in operative connection with a second drive shaft, which is preferably designed here as a second square shaft drive 9 in operative connection with a square shaft (not shown). A pneumatic control for the brake element of the brake station 6 can be implemented, for example, via the second drive element, here the second square shaft drive 9. Preferably, a common pneumatic control of the brake elements assigned to the brake stations 6 of the arc brake 5 is achieved by a rotational movement of the drive shaft (not shown), in particular the square shaft, which is arranged across the width of the machine. Accordingly, the brake station 6 can be displaced, in particular moved, along the square shafts and the crossbeam, for example as already described above.

[0026] The brake station 6 has a support element 13 at the end of the base body 7 located downstream with respect to the arc direction BLR. This support element 13 is preferably arranged to project laterally from the base body 7. The support element 13 is, for example, integrally formed with a drive wheel that is rotatably mounted on the base body 7. The drive wheel is designed here as a hedgehog wheel 15 for driving the brake element. The support element 13 has a connection surface 14, which is arranged here at least approximately horizontally. A functional unit can be interchangeably assigned to the connection surface 14, which is arranged here at least approximately horizontally. Each functional unit can accommodate a rotating or circumferential element, such as a brake element, accommodate a rotating or circumferential support element, have a pneumatically actuated element, or be designed as a blanking strip or similar.As a further measure, brake station 6 can be assigned another support element 13, for example, on the opposite side. This additional support element 13 can be identical in construction but mirrored to brake station 6. Furthermore, brake station 6 can be assigned identical or different functional units. For example, brake station 6 can simultaneously accommodate two brake elements or one brake element and another element via the support elements 13. Preferably, the support elements 13 accommodate identical, interchangeable functional units.

[0027] The brake station 6 is, for example, equipped with two pneumatic connections 11, 12, in particular two suction air connections 11, 12. The two suction air connections 11, 12 are connected to one or more vacuum generators (not shown), which may be separately controllable. A first suction air connection 11 can, for example, be provided for supplying suction air to the suction ring 10. The second suction air connection 12 can be provided for supplying suction air to the functional unit associated with the connection surface 14 of the support element 13. If, for example, the suction strip 16 is associated with the support element 13, the suction area of ​​the suction strip 16 can be supplied with suction air or vacuum. The pneumatic connections, here the first suction air connection 11 and the second suction air connection 12, can be extended along the brake station 6 or, as shown here, within the base body 7 of the brake station 6.Further pneumatic connections, particularly those carrying suction air, can be assigned to the brake station 6, which may also extend outside the main body 7 to the corresponding point of operation. Alternatively, at least partially different compressed air levels can be provided for different functional units. Furthermore, a compressed air connection can also be used to generate a vacuum at the brake station 6.

[0028] The first suction air connection 11 is preferably integrated into the base body 7 of the brake station 6 and extends to the inside of openings in the suction ring 10 at the upper apex of the suction ring 10. The second suction air connection 12, located here, for example, below the first suction air connection 11, also extends within the base body 7 of the brake station 6, preferably to the support element 13 of the brake station 6. Overpressure can be applied to one or both of the pneumatic connections, at least temporarily or permanently. This allows a blowing air effect to be achieved through the brake station 6. For example, pneumatic support elements can be supplied with blowing air. The suction and / or blowing air of the brake station 6 can preferably be continuously adjustable or regulated. Particularly preferably, the suction and / or blowing air of the brake station 6 is adjusted by a rotary valve, which can be assigned to the brake station 6.A rotary valve can, for example, have three recesses for separately controlling the suction air to the suction ring 10 and two pneumatic suction openings of the functional unit. Such a rotary valve can, for example, be actuated by the second drive element, in particular the second square shaft drive 9. A drive shaft, specifically a square shaft, of the second drive element can, for example, be driven at single speed by a servo motor. The drive movement of the servo motor is preferably adjustable and / or synchronized with the arc sequence. By means of the rotary valve, a cycle-by-cycle pneumatic control, in particular control of the suction air supply, to the suction ring 10 and / or the respective functional unit can be achieved.

[0029] An interchangeable functional unit can, for example, be designed as a suction strip 16, which also has a base surface 27 that is at least approximately horizontal (see further figures). The suction strip 16 is connected to the connection surface 14, in particular to the support element 13, of the brake station 6 via the base surface 27. The suction strip 16 has a deflection area for a circumferentially guided element, in particular a brake element, at both its front end (viewed in the arc direction BLR) and its rear end. A suction area with at least one suction air opening is formed between the two deflection areas on the surface to be swept by the brake element. Preferably, the suction strip 16 is designed with two side walls 19, between which a front deflection roller 20 and a rear deflection roller 21 are preferably mounted for rotational movement.A suction plate 22, preferably with a continuously flat guide surface for the brake element sliding over the suction plate 22, is provided between the front deflection roller 20 and the rear deflection roller 21. The suction plate 22 preferably incorporates at least one suction air channel 23 and / or at least one suction air bore 24, which are swept over by the brake element. The suction air channel 23 is preferably designed with an extension oriented in the arc direction. The at least one suction air channel 23 and / or the at least one suction air bore 24 of the suction plate 22 is operatively connected to a pneumatic supply device.

[0030] The braking element is preferably designed as a suction belt 17 with openings, also called suction openings 18, preferably arranged at regular intervals. The openings or suction openings 18 are preferably arranged centrally in the middle of the endless suction belt 17. However, areas with different suction opening densities can also be provided on the braking element(s). A suction belt 17 can consist of one or more bonded layers and / or have a uniform cross-section. A suction belt 17 can also have local protrusions or ribs. For example, a suction belt 17 can have one, two, or more protrusions or continuous ribs, oriented, for example, in the direction of rotation. If there are two ribs arranged laterally, the openings or suction openings 18 are preferably provided between these ribs.A suction belt 17 can be guided in particular by the front deflection roller 20 and the rear deflection roller 21 of the suction bar 16 and driven endlessly by the drive wheel, in particular by the hedgehog wheel 15, of the brake station 6.

[0031] The Fig. Figure 3 shows, in one embodiment, a functional unit designed here as a suction strip 16, which can be assigned to the support element 13 (not shown) via the connection surface 14 by means of two locking bolts 28. Preferably, the suction strip 16 has a recess 26 or a cutout in one, and particularly preferably in both, side walls 19 in the front deflection area, for example in the area of ​​the front deflection roller 20. The recesses 26 are particularly preferably provided in the upper area near a deflection area for the rotating element. Preferably, the recesses 26 on both sides are provided in the area of ​​the front deflection roller 20, in particular between the front deflection roller 20 and the suction plate 22 of the suction strip 16. The recesses 26 can, for example, be semicircular. The recesses 26 facilitate grasping a rotating element, in particular the brake element.suction band 17, for example for the purpose of replacing or changing the brake element or suction band 17. The recesses 26 also simplify the replacement of the surrounding element with the aid of a tool.

[0032] Preferably, the suction strip 16 has lateral guidance in the area of ​​at least one deflection element. Preferably, the two side walls 19 of the suction strip 16 are at least flush with, but preferably projecting beyond, the rear deflection roller 21, so that guidance of the downward-falling trailing edges of the sheet in the area of ​​the rear deflection roller 21 is possible on both sides. In particular, the side walls 19 act as guide elements or guide surfaces for the downward-falling trailing edges of the sheet. The distance of a preferably at least approximately vertically designed stop surface 25 from the axis of rotation of the rear deflection roller 21 corresponds at least to the radius of the rear deflection roller 21 plus the thickness of the braking element. The stop surface 25 is thus raised above the suction strip surface.In particular, worn and / or damaged suction belts 17 cannot cause sheet damage in the deflection area, especially in the area of ​​the falling sheet trailing edges in the region of the rear deflection roller 21. Preferably, the two side walls 19 have a continuous and / or rounded surface that provides a guiding effect upon contact with the sheet. The two side walls 19, which project beyond the rear deflection roller 21 and the suction belt 17, also guide the brake element or suction belt 17 to the hedgehog wheel 15, ensuring precise engagement of the hedgehog wheel 15 in the openings or suction ports 18. This reduces wear.

[0033] The Fig. Figure 4 shows a cross-section of a section of a braking station 6 with a suction strip 16 associated with a support element 13. Between the front deflection roller 20 and the rear deflection roller 21, the suction belt 17 is held in contact with the suction plate 22, so that the suction openings 18 of the suction belt 17, in conjunction with the negative pressure present in the suction air channel 23 and / or the suction air bore 24, create a suction effect on the undersides of the sheets transported via the braking station 6. The applied negative pressure can be individually or collectively adjustable or controllable. Here, for example, the suction strip 16 has two air chambers that can be pneumatically supplied via air guide channels 29 integrated into the position locking bolt 28. The position locking bolt 28, located upstream in the sheet travel direction BLR, supplies an air chamber extending in the sheet travel direction BLR and connected to the suction air channel 23 via several bridges.The position locking bolt 28, located downstream in the arc direction BLR, feeds an air chamber connected via a direct connection to the suction air bore 24. Both air chambers are housed in the suction plate 22 of the suction bar 16. The position locking bolts 28, with their air guide channels 29, are operatively connected to preferably separately controllable pneumatic supply devices, in particular to separately controllable pneumatic supply channels 31 of the support element 13. In an alternative embodiment, a single air chamber can also be provided in the functional unit, which is pneumatically connected to both air guide channels 29 of the two position locking bolts 28. Depending on the desired boundary conditions, the interchangeable functional units can have suitable geometrically shaped air chambers and / or suction openings and can be used on the connection surface 14 of the brake station 6 according to the current requirements.While at least one air duct 29 establishes a pneumatic connection between the functional unit and the connection surface 14, an air chamber can be used to distribute the airflow along the suction surface of the functional unit, particularly in the direction of arc travel BLR. An air duct 29 can also extend to the surface of the suction area of ​​the functional unit.

[0034] The suction belt 17 is preferably driven by the drive wheel of the brake station 6, which is designed here as a hedgehog wheel 15. The hedgehog wheel 15 can engage in the openings of the brake element, in particular in the suction openings 18 of the suction belt 17. The hedgehog wheel 15 is preferably driven rotaryally by the first drive element, preferably by the first square shaft drive 8 of the brake station 6, for example via an intermediate stage or a gearbox. The drive of the drive wheel, in particular the hedgehog wheel 15, is preferably dynamic and discontinuous, preferably synchronized between at least approximately the machine speed and the depositing speed. A servo motor, for example, can be used as the drive for the first drive element, in particular the square shaft of the first square shaft drive 8. The rotational movement of the hedgehog wheel 15 is preferably transmitted to the suction belt 17 by force and / or positive locking, so that the latter rotates continuously.Furthermore, the drive can interact with a control unit, such as the machine control, which allows for the desired depositing speed and / or, if necessary, the movement pattern of the brake element or suction belt 17 to be set and modified. This makes the sheet brake 5 adaptable to different pressure conditions. Alternatively, the brake station 6 can be assigned a separate drive and / or the brake element can be driven at a speed below the machine speed.

[0035] The Fig. Figure 5 shows a perspective view of a section of the brake station 6 with air supply system. Two supply channels 31 integrated into the base body 7 of the brake station 6 are visible, leading to the partially cutaway support element 13 of the brake station 6. At least one, preferably both, supply channels 31 extend from the base body 7 into the support element 13, with each of the at least one, and preferably both, supply channels 31 opening into a bore 30 integrated into the connection surface 14 of the support element 13. Each supply channel 31 can carry a separately adjustable or controllable pneumatic pressure, in particular suction air.The suction air for the two supply channels 31 can be supplied, for example, from the first pneumatic connection 11 and / or from the second pneumatic connection 12, in particular from the first suction air connection 11 and / or from the second suction air connection 12, of the brake station 6. Alternatively or additionally, an additional connection, which, for example, is located outside the base body 7 of the brake station 6 and leads to the suction bar 16, is also possible.

[0036] The Fig. Figure 6 shows an interchangeable functional unit designed as a suction strip 16. The suction strip 16 includes a flat base 27 in which two mutually spaced and / or aligned in the arc direction BLR are arranged locking pins 28. The locking pins 28 are hollow and thus each have an air channel 29 for the pneumatic supply of the suction strip 16. Preferably, the air channels 29 are used for the pneumatic supply, in particular for the suction air supply, of at least one suction opening of the suction strip 16. As a further development, sealing means could be assigned to one or both locking pins 28.

[0037] The Fig.Figure 7 shows a top view of the connection surface 14 of the support element 13 associated with the base body 7 for receiving an interchangeable functional unit. Pneumatic supply is provided via the spaced-apart bores 30, which are aligned with the position locking bolts 28 in the arc direction BLR and correspond to the position locking bolts 28. The bores 30 each have internal diameters that allow the position locking bolts 28 of the respective functional unit to be inserted at least approximately perpendicularly. The bores 30 are pneumatically connected to the supply channels 31 of the support element 13. List of reference symbols used 1 sheet 2 display stacks 3 grabber trolleys 4 curved guide plates 5 Bow brake 6 Brake station 7 Basic shapes 8 first square shaft drive 9 second square shaft drive 10 Suction ring 11 first pneumatic connection, first suction air connection 12 second pneumatic connection, second suction air connection 13 Support element 14 Connection area 15 Hedgehog wheel 16 suction strip 17 suction tape 18 Suction opening 19 side wall 20 front pulley 21 rear deflection pulley 22 Suction plate 23 Suction air duct 24 Suction air bore 25 Stop surface 26 recess 27 Base area 28 locking bolts 29 Air duct 30 bore 31 Supply channel BLR arc direction

Claims

[1] Braking station (6) for a sheet brake (5) in the delivery of a sheet processing machine, wherein the brake station (6) includes a connection surface (14), wherein interchangeable functional units (16) can be assigned to the connection surface (14), wherein at least one position securing element (28) is provided for securing the position of a functional unit (16) on the connection surface (14), wherein the position locking element (28) has an air guide channel (29), wherein the position locking element (28) is designed as a position locking bolt (28), wherein a functional unit (16) has two position locking bolts (28) and one or both position locking bolts (28) are pneumatically coupled to a suction air channel (23) and / or a suction air bore (24) of the functional unit (16) and wherein the connection surface (14) has two spaced-apart bores (30) which correspond to position locking bolts (28) of the respective functional unit (16). [2] Brake station (6) at least according to the preceding claim, characterized by , that the position locking bolts (28) are received by the bores (30) of the connection surface (14) in a form-fit and / or force-fit manner. [3] Brake station (6) according to at least one of the preceding claims, characterized by , that additional positioning elements are provided between a functional unit (16) and the connection surface (14). [4] Brake station (6) according to at least one of the preceding claims, characterized by , that at least one pneumatically acting supply channel (31) opens into one of the bores (30) in the connection surface (14). [5] Brake station (6) according to at least one of the preceding claims, characterized by , that the connection surface (14) is horizontally aligned. [6] Brake station (6) according to at least one of the preceding claims, characterized by , that one or both of the position locking bolts (28) are assigned sealing material. [7] Brake station (6) according to at least one of the preceding claims, characterized by , that the functional unit (16) has two deflection elements (20, 21) on which a brake element (17) can be arranged to be guided circumferentially. [8] Brake station (6) according to at least one of the preceding claims, characterized by , that a functional unit (16) is designed as a suction bar (16) with two laterally arranged side walls (19) carrying deflection rollers (20, 21).

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