Delivery means for a sheet-processing machine, sheet-processing machine, and method for operating a delivery means
Patent Information
- Application Number
- EP2024726580
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-08-08
- Filing Date
- 2024-05-14
- Publication Date
- 2026-01-21
Smart Images
Figure EP2024063207_13022025_PF_FP_ABST
Abstract
Description
[0001] Description
[0002] Delivery for a sheet-fed machine, sheet-fed machine and method for operating a delivery
[0003] The invention relates to a delivery for a sheet-processing machine, a sheet-processing machine and a method for operating a delivery.
[0004] From DE 10361 204 A1 a device for the axial adjustment of brake stations is known, in which a guide cross member is designed as a hollow cylinder and accommodates in its interior the adjusting bodies for the brake stations, which are driven by threaded spindles.
[0005] DE 40 35 037 C2 describes a device for the axial adjustment of suction rings in sheet brakes of printing machines, whereby the sheet brake consists of several suction rings arranged across the machine width and their axial adjustment and clamping is carried out via an adjusting unit consisting of a servo motor and a rack.
[0006] DE 199 26401 C1 discloses a method for controlling an axially adjustable sheet brake device in a delivery of a printing press with a drive shaft which can be moved in or against the conveying direction by means of a guide carriage, extends transversely to the conveying direction of the sheets and accommodates a plurality of sheet brakes, and a guide cross member which accommodates the sheet brakes with their suction bodies and is arranged parallel thereto, as well as a rack arranged parallel to the guide cross member, wherein each sheet brake has a drive motor coupled to a control / regulation system.
[0007] From DE 101 40 825 A1 a method for adjusting guide elements for flat material on the basis of print image information is known, wherein the job-specific optimal setting position for the positioning of sheet guiding and sheet conveying elements is determined using the job-specific print image information known from the prepress stage.
[0008] DE 197 09 083 C1 describes a device for the axial adjustment of sheet brakes in a delivery of a printing press with a guide cross member which can be moved in or against the conveying direction by means of a guide carriage, extends transversely to the conveying direction of the sheets and accommodates several sheet brakes, as well as a rack arranged parallel to the guide cross member.
[0009] When adapting to the respective sheet formats to be processed, the braking elements of the sheet brakes, which can be formed by suction rings or rotating suction belts and accommodated by movable braking stations, must be adjusted axially to pressure-free corridors and pressure-free side edges.
[0010] The outer brake elements are positioned at a defined distance from the sheet edges. In perfecting operations, on sheet-processing machines designed as printing presses, there is usually very little non-printing area at the side edges of the sheet, especially the printed sheet. The width of the non-printing side edges is often less than ten millimeters, so the brake elements of the sheet brakes must be positioned very far to the outside.
[0011] As a result, when production starts, especially during printing, the first sheet(s) in the delivery cannot be reliably grasped by the braking elements. This can lead to so-called overshoots and a safety stop of the sheet-processing machine. When higher printing speeds are achieved, the positional stability of the sheets fed into the delivery automatically improves because the sheets are less likely to bend or sag due to an air cushion formed beneath them.
[0012] The described undesirable effects occur mainly when processing thin materials.
[0013] The invention is based on the object of creating a delivery for a sheet-processing machine, a sheet-processing machine and a method for operating a delivery, in particular an alternative delivery for a sheet-processing machine with a sheet brake having at least two axially displaceable braking stations or an alternative for operating a delivery for a sheet-processing machine.
[0014] In particular, increased operational reliability of the delivery for a sheet-processing machine, for example a printing press, is to be ensured and a method for operating the delivery is to be provided.
[0015] The object is achieved according to the invention by the features of claims 1, 9 and 10 respectively.
[0016] Advantageous embodiments emerge from the subclaims, the description and the drawings.
[0017] The invention has the advantage of providing an alternative delivery for a sheet-processing machine with a sheet brake having at least two axially displaceable braking stations, and a method for operating the delivery. In particular, a more trouble-resistant delivery is also created, which can further improve the sheet stacking process. A corresponding sheet-processing machine, for example, a printing press, with such a delivery is also provided.
[0018] An embodiment of the invention is illustrated in the drawings and is described in more detail below.
[0019] They show:
[0020] Fig. 1 is a schematic representation of a delivery of a sheet processing machine with a sheet brake;
[0021] Fig. 2 is a perspective view of a sheet brake with brake stations mounted on a guide cross member and displaceable by threaded spindles;
[0022] Fig. 3 a side view of a brake station mounted on the guide cross member.
[0023] Fig. 1 shows, for example, a section of a delivery of a sheet-processing machine, e.g. a printing press, in particular a sheet-fed printing press, here specifically a sheet-fed offset rotary printing press, preferably in a unit and in-line design. The delivery contains a sheet conveyor system (not shown in detail) that transports sheets 01, which have been printed, varnished, processed, etc., in the printing press to a delivery pile 02. This sheet conveyor system is preferably designed as a chain conveyor system with two delivery chains, each guided laterally on the frame of the delivery, between which gripper carriages 03 are arranged. The gripper carriages 03 have sheet fixing systems with which the sheets 01 to be transported are gripped at the leading edge.The delivery chains guide the gripper carriages 03 on a gripper carriage track in the sheet travel direction BLR up to above the delivery pile 02, where the gripper carriages 03 release the sheets 01 for deposit. On the sheet conveyor path to the delivery pile 02, at least one mechanical sheet guiding element, preferably one or more sheet guiding plates 04, is arranged in the delivery below the sheet transport plane, which guides the sheets 01 on their way to the delivery pile 02. The sheet guiding plate 04 has an at least approximately closed surface for the sliding and / or floating guidance of the sheets 01. The sheet guiding plate 04 can be provided with an ink-repellent coating. Furthermore, nozzle openings for the pneumatic guidance of the sheets 01 can be assigned to the sheet guiding element, in particular the sheet guiding plate 04. The printing press can preferably be designed so that it can be switched between the straight printing and perfecting and verso printing operating modes.An air cushion can be formed between the sheet guide element, in particular the sheet guide plate 04, and the sheets 01 transported above it, in particular in the front and back printing mode.
[0024] In the delivery, a sheet brake 05 is arranged upstream of the delivery pile 02 in the sheet travel direction BLR, which takes over the sheets 01 to be deposited from the gripper carriages 03 and, after their release, decelerates them from machine speed to depositing speed. After deceleration by the sheet brake 05, the sheets 01 are aligned at front, rear and / or side edge stops (not shown) and neatly deposited on a pallet or the delivery pile 02. The delivery pile 02 is preferably lowered by a pile lifting drive (not shown) during the sheet depositing process in such a way that the delivery pile surface forms an at least approximately constant depositing level for the incoming sheets 01. The sheet brake 05 contains at least two braking stations 06, which are arranged so as to be axially displaceable, i.e. transversely to the sheet travel direction BLR, in particular displaceable.However, several such braking stations 06 can also be used, for example at least three or exactly three, four, five or, depending on the format, even more braking stations 06. The braking stations 06 are axially adjusted to a respective unprinted page edge, to print-free corridors and / or to sufficiently dried ink areas of the sheets 01. At least one actuator 12, 13, 23 is designed for the axial adjustment of the braking stations 6. For example, one actuator 12, 13, 23 can move the braking stations 06, in particular via spindles. A separate actuator 12, 13, 23 can be assigned to one, several or all braking stations 06. Braking stations 06 that are not required can be deactivated and / or moved out of the area of the sheet format.
[0025] At least one, but preferably several or all, braking stations 06 can each accommodate at least one braking element, preferably a braking belt 17, which is in particular mounted so as to rotate about one or more axes of rotation. The braking element, in particular braking belt 17, preferably interacts pneumatically with the sheets 01 transported via the sheet brake 05. In particular, the sheets 01 are brought into contact with the braking element, in particular braking belt 17, and / or held in contact by suction air, so that contact is created between the braking element, in particular braking belt 17, and the respective sheet 01. The braking element, in particular braking belt 17, moves at least temporarily at a speed lower than the machine speed and decelerates a respective sheet 01 released by the gripper carriage 03 accordingly.For this purpose, at least one drive can be assigned to the braking element, in particular brake band 17, which drives or decelerates it at a constant or variable speed that is reduced compared to the machine speed. Preferably, however, the braking element, in particular brake band 17, is operated dynamically and / or periodically between at least approximately the machine speed and a lower deposition speed compared to this. If there are multiple braking elements, in particular brake bands 17, the drive can also drive or decelerate several or all of the braking elements, in particular brake bands 17. Alternatively, each braking element, in particular brake band 17, can be assigned a separate drive.In a further development, the braking element, for example a suction ring or the braking band 17, with a braking element, for example a suction ring or also a braking band 17, of a further braking station 06 acts transversely tightening a respective sheet 01 to be deposited by means of an arrangement diverging with respect to the sheet travel direction BLR.
[0026] Fig. 2 shows a perspective view of a sheet brake 05 with braking stations 06, for example as described above. The sheet brake 05 is in particular accommodated in a separate frame and designed to be displaceable in and against the sheet travel direction BLR for adjustment to different sheet formats. On a side facing the stacking area, a cross member is arranged, preferably across the machine width, which cross member is designed here as a trailing edge cross member 18 and is assigned to the sheet brake 05. The trailing edge cross member 18 preferably carries a plurality of trailing edge stops 19, each of which is pivotably mounted about a pivot axis oriented in the sheet travel direction BLR. By displacing the sheet brake 05 in or against the sheet travel direction BLR, the trailing edge stops 19 are adjusted to the current sheet format.
[0027] Preferably, the cross member, in particular the trailing edge cross member 18, and / or a further cross member 20 of the sheet brake 05 is connected, in particular firmly, to respective plates 21 arranged laterally in the region of the frame. In or outside the region of a maximum sheet format width, a guide cross member 10 for the braking stations 06 can be connected to the plates 21 or carried by them. Preferably, the cross member, in particular the trailing edge cross member 18, and / or the further cross member 20, or connecting elements, are led beyond the plates 21 in such a way that they pass through the lateral frame of the delivery through openings in the frame wall. Preferably, the frame wall is a main frame wall, or the frame wall forms a plane with a cylinder-supporting wall.Particularly preferably, the cross member, in particular the trailing edge cross member 18, and / or the further cross member 20 or a connecting element outside the delivery frame is received by a fixing plate 22, which is supported relative to the delivery frame. The fixing plates 22, which are preferably arranged on both sides outside the delivery frame, are held or mounted so as to be displaceable or slidable relative to the delivery frame, in particular in and against the sheet travel direction BLR. The fixing plates 22 can be mounted, for example, by means of strips. Preferably, further protection is provided to encapsulate the elements that pass through the frame wall.
[0028] The sheet brake 05 here, for example, contains four braking stations 06, which can be displaced or moved axially along the guide crossbar 10 arranged transversely to the sheet travel direction BLR by a respective actuator 12, 13, 23. The guide crossbar 10 is preferably arranged approximately centrally of the braking stations 06, as seen in the sheet travel direction BLR, and is connected in particular to the lateral plates 21 that can be displaced for format adjustment. In particular, the guide crossbar 10 is thus fixed to the frame but adjustable in format. The guide crossbar 10 extends at least over the maximum sheet format to be processed and, in particular, supports all braking stations 06 of the sheet brake 05.
[0029] An actuator 12, 13, 23 for one, several, or all braking stations 06 of the sheet brake 05 can, for example, have spindle drives 23 arranged outside the plates 21, in particular independently controllable, which can each be assigned to a braking station 06. For example, the spindle drives 23 are arranged outside the frame. Preferably, the spindle drives 23 can be attached, in particular screwed, outside the frame of the delivery to a fixing plate 22 arranged, for example, on the operator side of the machine. The actuator 12, 13, 23 for the braking stations 06 of the sheet brake 05 here contains, in particular, a threaded spindle 12 for each braking station 6, wherein each of the threaded spindles 12 can be driven by one of the spindle drives 23, for example via any coupling connection or a special cardan coupling.A respective braking station 06 is connected to the respective threaded spindle 12 via an associated adjusting element 13 and is axially displaced by this adjusting element 13 upon rotation of the threaded spindle 12. Each adjusting element 13 has, in particular, precisely one connection point, in particular an engagement point, to a threaded spindle 12. The threaded spindles 12 of the further braking stations 06 are guided through bores without engagement to the adjusting element 13. The sheet brake 05 further has a first drive, in particular a first square shaft drive 08, for driving braking elements, in particular brake bands 17, and preferably a second drive, in particular a second square shaft drive 09, for pneumatically controlling the braking elements, in particular brake bands 17.
[0030] Fig. 3 shows a side view of a braking station 06 of a sheet brake 05 for a sheet-processing machine, for example as described above. The braking station 06 here contains a base body 07, which is mounted on a guide cross member 10 arranged across the machine width, i.e., transversely to the sheet travel direction BLR. The braking station 06 is mounted so as to be displaceable or slidable along the guide cross member 10, which here is particularly profiled. The guide cross member 10 preferably has at least one flat outer surface and / or at least one flat inner surface and is open at the bottom. The braking station 06 is preferably adapted to the outer surface of the guide cross member 10. The guide cross member 10 particularly preferably has a vertical extent and a horizontal extent, wherein the vertical extent corresponds at least approximately to the horizontal extent.The guide cross member 10 is preferably designed as a downwardly open U-profile and, in particular, at least partially encloses the actuator 12, 13, 23. The actuator 12, 13, 23 can have an actuating element 13 that is axially displaceable by a threaded spindle 12 and is guided along the guide cross member 10 by means of at least one and preferably several flat guide surfaces 14. In particular, a respective brake station 06 is mounted and guided on the guide cross member 10 exclusively by means of guide surfaces 14.
[0031] A braking station 06 is preferably connected to the associated actuating element 13 in such a way that it is guided by means of flat guide surfaces 14 of the actuating element 13 on flat guide surfaces 14 of the guide cross member 10, wherein the actuating element 13 carries the braking station 06.
[0032] The adjusting element 13 is preferably firmly or detachably connected to a base body 07 of the braking station 06 by means of fixing elements. For example, the adjusting element 13 can be fixed to the base body 07 by means of screw connections 15. The guide cross member 10 is arranged at least approximately centrally to the braking station 06, in particular with respect to the sheet travel direction BLR, so that clamping or tilting of the braking station 06 relative to the guide cross member 10 is prevented. The braking station 06 is guided by the adjusting element 13 in particular such that the braking station 06 is held and / or guided at a distance S1; S2 from the cross member, in particular the trailing edge cross member 18, and / or from the further cross member 20. The distance S1; S2 can be the same or different, whereby a minimal extension of the distance S1; S2 is sufficient. For example, the distance S1; S2 can be approximately 0.1 mm to 3 mm, preferably at least approximately 1 mm.The distance S1; S2 can remain unchanged during axial adjustment and / or during the production process.
[0033] The braking station 06 is assigned a first drive element, which is preferably operatively connected to a first drive shaft and here is preferably designed as a first square shaft drive 08 operatively connected to a square shaft. The braking element assigned to the base body 07, here a braking band 17, can be driven via the first drive element, here in particular the first square shaft drive 08. In this case, all braking elements assigned to the braking stations 06 of the sheet brake 05, in particular braking bands 17, are preferably driven jointly, preferably by a rotational movement of the drive shaft arranged across the machine width, here in particular a square shaft. The square shaft of the first square shaft drive 08 is arranged parallel to the guide cross member 10.The square shaft of the first square shaft drive 08 is in particular in contact with surfaces of output elements on the base body 07 of the, and preferably each, braking station 06 of the sheet brake 05, which receive the square shaft of the first square shaft drive 08. The surfaces of the output elements of the braking stations 06 slide accordingly on the outer contour of the square shaft of the first square shaft drive 08 during its axial adjustment.
[0034] The braking station 06 is further assigned a second drive element, which is preferably operatively connected to a second drive shaft and here is preferably designed as a second square shaft drive 09 operatively connected to a square shaft. Via the second drive element, here in particular the second square shaft drive 09, a pneumatic control for the braking element, here the braking band 17, of the braking station 06 can be carried out, for example. In this case, a common pneumatic control of all braking elements assigned to the braking stations 06 of the sheet brake 05, in particular braking bands 17, preferably takes place by a rotational movement of the drive shaft arranged across the machine width, here in particular a square shaft. The square shaft of the second square shaft drive 09 is also arranged parallel to the guide cross member 10.The square shaft of the second square shaft drive 09 is in particular in contact with surfaces of output elements on the base body 07 of the, and preferably each, braking station 06 of the sheet brake 05, which receive the square shaft of the second square shaft drive 09. The surfaces of the output elements of the braking stations 06 slide accordingly on the outer contour of the square shaft of the second square shaft drive 09 during their axial adjustment. The braking station 06 is accordingly axially displaceable, in particular slidable, along the square shafts of the first or second square shaft drive 08; 09 and the guide cross member 10, for example as already described above. The connection points between the output elements of the braking station 06 and a square shaft of the first square shaft drive 08 or second square shaft drive 09 are designed, in particular, with play in order to prevent jamming during axial movement.
[0035] The braking station 06 here has a support element at the end of the base body 07 located downstream with respect to the sheet travel direction BLR, which support element is preferably arranged in a protruding manner laterally on the base body 07. The support element is formed, for example, onto a drive wheel rotatably mounted on the base body 07. The drive wheel can be designed, for example, as a hedgehog wheel for driving the brake band 17. The support element has an upper connection surface, which is arranged at least approximately horizontally here. A functional unit can preferably be exchangeably assigned to the connection surface, which is arranged at least approximately horizontally here. A respective functional unit can accommodate a rotating or circulating brake element, in particular the brake band 17, a rotating or circulating support element, have a pneumatically acting element, or can also be designed as a dummy bar or the like.In a further development, a further support element can be assigned to the braking station 06, for example, on the opposite side of the base body 07. The further support element can be structurally identical but assigned as a mirror image to the braking station 06. Furthermore, identical or different functional units can be assigned to the braking station 06.
[0036] For example, the brake station 06 can simultaneously accommodate two brake bands 17 or one brake band 17 and another element via the support elements. Preferably, the support elements accommodate identical, interchangeable functional units.
[0037] The functional unit, which is preferably interchangeably assigned to the braking station 06, can also have a base surface that is arranged at least approximately horizontally and can be or be connected via this base surface to the connection surface on the support element of the braking station 06. A functional unit for receiving and guiding a braking band 17 is preferably designed as a suction bar 16. This suction bar 16 has a deflection area with deflection elements for the circumferentially guideable braking band 17 at the front end and at the rear end, as seen in the sheet travel direction BLR. Between the two deflection areas, a suction area with at least one suction air opening is formed on the surface to be swept over by the braking band 17. The suction bar 16 is preferably designed here with two side walls, between which a front deflection roller and a rear deflection roller are preferably received in a rotationally movable manner.Between the front deflection roller and the rear deflection roller, a suction plate is preferably provided, in particular with a continuously flat or contoured guide surface for the brake band 17 sliding over the suction plate. At least one suction air duct and / or at least one suction air bore is preferably incorporated in the suction plate, which is swept over by the brake band 17. A suction air duct is preferably formed on the surface of the suction plate with an extension oriented in the sheet travel direction BLR. Between the front deflection roller and the rear deflection roller, the brake band 17 is held in contact with the suction plate, so that openings or holes in the brake band 17, in conjunction with the negative pressure present in the suction air duct and / or the suction air bore, create a suction effect on the undersides of the sheets transported via the braking station 06. The negative pressure present can be adjustable or also controllable.The rotational movement of the drive wheel is preferably transmitted to the brake band 17 in a force-locking and / or form-locking manner, so that the latter rotates endlessly. The brake band 17 is preferably driven by the drive wheel of the braking station 06, which is designed here as a hedgehog wheel, wherein the hedgehog wheel preferably engages with pins in the openings of the brake band 17. The hedgehog wheel is preferably rotationally driven by the first drive element, in particular the first square shaft drive 08, of the braking station 06, for example via an intermediate stage or a gear. The drive of the drive wheel, in particular the hedgehog wheel, is preferably dynamic and discontinuous, preferably cyclically controlled, between at least approximately the machine speed and the deposition speed. A servo motor 24, for example, can be used as the drive for the first drive element, in particular the square shaft of the first square shaft drive 08.Preferably, the servo motor 24 can be mounted, in particular screwed, outside the delivery frame on a fixing plate 22 arranged, for example, on the drive side of the machine. Furthermore, the drive can interact with a control device, for example the machine control system, via which a desired delivery speed and / or, if necessary, the movement pattern of the braking element, in particular of the braking belt 17, can be set and modified. Thus, the sheet brake 05 with the braking stations 06 can be adapted to the different printing conditions. Alternatively, a separate drive can be assigned to a braking station 06 and / or the braking belt 17 can be driven at a constant or variable speed below the machine speed.
[0038] A respective braking station 06 of the sheet brake 05 is assigned a pneumatic connection, which here is preferably designed as a suction air connection 11 and is connected to at least one, for example, controllable vacuum generator (not shown). The suction air connection 11 can, for example, be provided for supplying suction air to the functional unit assigned to the connection surface of the carrier element. If, for example, a functional unit designed as a suction bar 16 is assigned to the carrier element, the suction area of this suction bar 16 can be subjected to suction air or vacuum. The pneumatic connection, here the suction air connection 11, can be continued along the braking station 06 or, as shown here, for example, within the base body 07 of the braking station 06. Alternatively, the pneumatic connection can also be designed as a compressed air connection for generating a vacuum at the braking station 06 according to the ejector principle.In a further development, additional pneumatic connections, particularly those carrying suction air, can be assigned to the braking station 06, which can also be routed outside the base body 07 to the corresponding active point. At least partially different suction air or compressed air levels can also be provided for different functional units or different states.
[0039] The suction air connection 11 is preferably incorporated into the base body 07 of the braking station 06 and also runs in the base body 07 of the braking station 06 to the support element of the braking station 06. Overpressure can also be applied to the pneumatic connection, at least temporarily or permanently. This allows a blowing air effect to be achieved by the braking station 06. The suction and / or blowing air of the braking station 06 can preferably be continuously adjustable or controllable. Particularly preferably, the suction and / or blowing air of the braking station 06 is clocked by an air control element, in particular a rotary valve, which can be assigned to the braking station 06. A rotary valve can have recesses for separately controlling the suction air of a catcher element (not shown) and two pneumatic connections for the functional unit.Such a rotary valve can be actuated, for example, by the second drive element, in particular the second square shaft drive 09. A drive shaft, especially a square shaft, of the second drive element can be driven at a single speed, for example, by a servo motor 25. Preferably, the servo motor 25 can be mounted, in particular screwed, outside the frame of the delivery on a fixing plate 22 arranged, for example, on the drive side of the machine. The drive movement of the servo motors 24; 25 is preferably adjustable and / or can be coordinated with the sheet sequence. For example, by means of the rotary valve, a cyclic pneumatic control, in particular a control of the suction air supply, to a catcher element and / or the respective functional unit used, in particular the suction bar 16 with brake band 17, can be carried out.
[0040] The at least one actuator 12, 13, 23, in particular the respective spindle drive 23, is connected to a controller, particularly in terms of control technology. The controller is designed to control the at least one actuator 12, 13, 23 and controls the at least one actuator 12, 13, 23. If multiple actuators 12, 13, 23 are configured, the controller is connected to each of the actuators 12, 13, 23 directly or, for example, via a bus system and controls all actuators 12, 13, 23 as needed.
[0041] The control system is designed to control the axial adjustment of the braking stations 06 during delivery operation, depending on the operating state of the delivery or the sheet-processing machine. The operation of the delivery is defined as a state in which sheets 01 are deposited in the delivery.
[0042] The control of the axial adjustment of the braking stations 06 during delivery operation, depending on the operating state of the delivery or the sheet-processing machine, is fundamentally different from the adjustment of the braking stations 06 to pressure-free corridors or side edges according to the prior art, since the adjustment of the braking stations 06 to pressure-free corridors can occur in any operating state and is practically carried out without any reference to a specific operating state being established, monitored, or established. Preferably, the braking stations 06 are adjusted to pressure-free corridors or side edges according to the prior art before the delivery begins operating.
[0043] Axial adjustment of at least one brake station 06 is understood to mean a displacement of at least one brake station 06 in the axial direction while maintaining the angular position of at least one brake station 06.
[0044] Further preferably, the axial adjustment of at least one braking station 06 is an axial displacement, wherein in particular the angular positions of the rotation axes of the deflection elements over which the braking elements, in particular brake band 17, of a respective braking station 06 are guided are maintained.
[0045] In particular, during an axial adjustment, all deflection elements of a respective brake station 06 are displaced in the same axial path.
[0046] In an embodiment according to the invention, the operating state of the delivery or the sheet-processing machine can be, in particular, the speed of the delivery or the sheet-processing machine.
[0047] The operating status of the delivery or the sheet processing machine can also be the reaching of a number of sheets 01 stored in the delivery for a respective production order.
[0048] The speed of the sheet-processing machine is the speed at which the sheet-processing machine processes, particularly prints, sheets. The speed of the delivery is the speed at which the delivery deposits sheets. The operating status can also be a change in the speed of the delivery or the sheet-processing machine.
[0049] Accordingly, an axial adjustment of the braking stations 06 can be triggered by reaching a certain speed of the delivery or the sheet-processing machine or by exceeding a certain speed of the delivery or the sheet-processing machine or by passing through a certain speed range or by reaching a speed gradient of the delivery or the sheet-processing machine.
[0050] The operating state can in particular also be the start of production operations or the resumption of production operations after an interruption of production operations.
[0051] Preferably, the control is designed to control the axial adjustment of the brake stations 06 by a path stored in the control or in a memory connected to the control.
[0052] In particular, the control is designed to control the axial adjustment of the brake stations 06 according to a movement sequence, wherein the movement sequence for a respective brake station 06, in particular for a respective outer brake station 06, comprises a reversal of direction.
[0053] In addition to the control system, an input point connected to the control system can be provided, with which a parameter for the axial adjustment path can be entered. In this case, the control system is designed to move a respective braking station 06 from its initial position according to the entered parameter and then return it to the initial position. The following describes the mode of operation of a method according to which the delivery can be operated in selected versions.
[0054] Preferably, in front of a respective production plant for a production order, at least one braking station 06 is positioned axially towards the center of the delivery next to a position at which unprinted side edges of sheets 01 to be processed will pass through the delivery. Preferably, exactly two braking stations 06, in particular the two outer braking stations 06, are each positioned axially towards the center of the delivery next to a position at which unprinted side edges of sheets 01 to be processed will pass through the delivery. The axial offset with which the braking stations 06 are positioned with respect to the positions at which unprinted side edges of sheets 01 to be processed will pass through the delivery can in particular be specified as a path permanently stored in the memory or the control system, or can preferably be entered by an operator via an input point for implementation by the control system.The path is freely adjustable, particularly up to a reasonable base value, especially the minimum value. Values below the base value can be locked.
[0055] In particular, the path can be determined or selected to be larger for a particularly thin and flexible sheet material than for a thick and rigid sheet material.
[0056] Due to the axial position of the outer braking stations 06, the sheets 01 to be deposited are securely grasped by the braking stations 06. The braking stations 06 can then be adjusted axially from the center of the delivery, transverse to the sheet travel direction BLR, to the non-printing side edges of the sheets 01. The axial adjustment of the braking elements 06 preferably takes place synchronously with one another and at such a low adjustment speed that the sheets 01 are not shifted transverse to the sheet travel direction BLR or subjected to undue mechanical stress. During the axial adjustment of the braking stations 06, sheets 01 are continuously deposited from the delivery.
[0057] Preferably, the axial adjustment of the braking stations 06 to the unprinted side edges of the sheets 01 is initiated when a maximum speed of the delivery or the sheet processing machine specified for the production order is reached.
[0058] The axial adjustment of the braking stations 06 to the unprinted side edges of the sheets 01 can also be initiated when a specified or specifiable number of sheets 01 is stored in the delivery for a respective production order.
[0059] The specified or specifiable number of sheets 01 can preferably be entered or input by the operator using a suitable input device, in particular the control station.
[0060] Preferably, in a control station of the sheet-processing machine, the function for moving the braking stations 06 can be selectively selected or deselected by an operator via appropriately designed input means depending on an operating state of the delivery or the sheet-processing machine.
[0061] If a malfunction occurs during production that requires the delivery or sheet-processing machine to be stopped, the axial adjustment of the braking stations 06 is repeated, beginning with an axial adjustment of the braking stations 06 toward the center of the delivery. After production restarts, the braking stations 06 are axially relocated to the position at which the unprinted side edges of sheets 01 to be processed pass through the delivery, or, in other words, adjusted to the unprinted side edges of the sheets 01 to be deposited.
[0062] 01 Bow
[0063] 02 Display stack
[0064] 03 Gripper trolley
[0065] 04 Curve guide plate
[0066] 05 Bow brake
[0067] 06 Brake station
[0068] 07 Basic body
[0069] 08 Square shaft drive, first
[0070] 09 Square shaft drive, second
[0071] 10 guide traverse
[0072] 11 Suction air connection
[0073] 12 threaded spindle
[0074] 13 Control element
[0075] 14 Guide surface
[0076] 15 Screw connection
[0077] 16 suction bar
[0078] 17 Brake band
[0079] 18 trailing edge cross member
[0080] 19 Trailing edge stop
[0081] 20 trusses, further
[0082] 21 Shield
[0083] 22 Fixing plate
[0084] 23 Spindle drive
[0085] 24 servo motor
[0086] 25 servo motor
[0087] BLR sheet running direction S1 distance
[0088] S2 distance
Claims
Claims 1. Delivery for a sheet-processing machine with a sheet brake (05) having at least two axially displaceable braking stations (06), wherein the sheet brake (05) has a guide cross member (10) on which the braking stations (06) are supported, wherein at least one actuator (12, 13, 23) is designed for axially adjusting the braking stations (06) and a control system controlling the at least one actuator (12, 13, 23) is provided, wherein the control system is designed to control the axial adjustment of at least one braking station (06) during operation of the delivery as a function of an operating state of the delivery or of the sheet-processing machine.
2. Delivery according to claim 1, characterized in that the operating state is the speed of the delivery or the sheet processing machine.
3. Delivery according to claim 1 or 2, characterized in that the operating state is the change in the speed of the delivery or the sheet processing machine or the reaching of a number of sheets (01) deposited in the delivery for a respective production order.
4. Display according to claim 1, 2 or 3, characterized in that the operating state is the start of a production operation or the resumption of production operation after an interruption of production operation.
5. Display according to claim 1, 2, 3 or 4, characterized in that the control is designed to control the axial adjustment of the braking stations (06) by a path stored in the control or in a memory connected to the control.
6. Display according to claim 1, 2, 3, 4 or 5, characterized in that the control is designed to control the axial adjustment of the braking stations (06) according to a movement sequence, wherein the movement sequence for a respective braking station (06) comprises a reversal of direction.
7. Delivery according to claim 1, 2, 3, 4, 5 or 6, characterized in that the control is designed to control the axial adjustment of two braking stations (06) during operation of the delivery in opposite directions away from each other, with synchronous displacement speed.
8. Display according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that an input point connected to the control is provided, with which a parameter for a path of the axial adjustment can be entered and wherein the control is designed to displace a respective braking station (06) from its initial position in accordance with the entered parameter and to subsequently displace it back into the initial position.
9. A sheet-processing machine having a delivery according to claim 1, 2, 3, 4, 5, 6, 7 or 8.
10. Method for operating a delivery for a sheet-processing machine with a sheet brake (05) having at least two axially displaceable braking stations (06), in particular a delivery according to one of claims 1, 2, 3, 4, 5, 6, 7 or 8, wherein at least one braking station (06) for a respective production order is arranged before a production operation in the direction of the center of the delivery axially next to a position at which unprinted side edges of sheets (01) to be processed will pass the delivery and after the start of the production operation axially to the position at which the unprinted side edges of sheets to be processed (01) pass through the delivery.
11. Method according to claim 10, characterized in that a respective braking station (06) is displaced along the same path after a production interruption, before a renewed production operation, from the position at which unprinted side edges of sheets (01) to be processed have passed the delivery in the direction of the center of the delivery axially next to the position at which unprinted side edges of sheets (01) to be processed have passed the delivery and after the start of the renewed production operation axially again to the position at which unprinted side edges of sheets (01) to be processed have passed the delivery.
12. Method according to claim 10 or 11, characterized in that only two braking stations (06) which are outermost in relation to the center of the delivery are displaced during production operation to unprinted side edges of processed sheets (01), while all other braking stations (06) encompassed by the sheet brake (05) remain stationary, viewed in the axial direction.