Deliverer of a sheet processing machine with a stop device and method for producing and / or assembling a front stop

Abstract

The invention relates to a delivery of a sheet-processing machine, in particular a printing press or punching machine, comprising a stop device with at least one front stop (16) that can be assigned to a front stop cross member (17). The front stop (16) comprises several articulated and / or connected parts (18, 19) for fixing to the front stop cross member (17). The invention also relates to a method for producing and / or assembling a front stop (16).

Description

[0001] The invention relates to a delivery of a sheet-processing machine, in particular a printing press or punching machine with a stop device and a method for producing and / or assembling a front stop of a stop device for a delivery of a sheet-processing machine.

[0002] In particular, stop devices with leading edge stops are used to align printed sheets in the longitudinal direction to form a stack in the delivery of printing machines.

[0003] Currently, such a front stop is manufactured as a machined cast part. This must be precisely aligned and calibrated during assembly. Its position must then be drilled and pinned. Replacement is only possible by disassembling the front stop shaft. Furthermore, it has a high deadweight. A front stop of this type is shown, for example, in DE 10 2014 210 108 A1. The disadvantage is the complicated manufacturing process, which involves subsequent milling of a cast part. Assembly in the delivery requires multiple steps, including measuring, aligning, drilling, and pinning. The higher deadweight of the front stop is also disadvantageous for the ever-increasing cycle speeds of printing presses.

[0004] WO 2017 / 001397 A1 discloses delivery devices for a sheet-processing machine, which feature multi-part stop devices that can be moved selectively between an active and an inactive position. These stop devices feature a special bearing and are designed for the specific application of a double-pile delivery.

[0005] DE 20 2014 103 110 U1 discloses a stop element for aligning punched sheets in a punched sheet magazine and a punched sheet magazine, wherein a rear stop wall is formed from a one-piece component comprising two sections arranged at an angle to each other. The component can be formed from a sheet metal strip or be designed as an injection-molded plastic part. This is not suitable for any other application.

[0006] The invention is based on the object of creating an alternative delivery of a sheet-processing machine with a stop device and an alternative method for producing and / or assembling a front stop of a stop device for a delivery of a sheet-processing machine. In particular, a mass- and cost-optimized and / or assembly- and service-friendly front stop for sheet alignment in the delivery of a sheet-processing machine, in particular a printing press, is to be created.

[0007] The object is achieved according to the invention by the features of an independent claim.

[0008] The advantages achievable with the invention consist in particular in the fact that an alternative delivery of a sheet-processing machine with a stop device and an alternative method for producing and / or assembling a front stop of a stop device for a delivery of a sheet-processing machine is created. In particular, a mass- and cost-optimized and / or assembly- and service-friendly front stop for sheet alignment in the delivery of a sheet-processing machine, in particular a printing press, is created. Such a front stop is cost-optimized, can be easily installed and aligned, and is easily replaced during servicing. A corresponding delivery or sheet-processing machine, in particular a printing press or die-cutting machine, with a delivery having such a stop device is provided.

[0009] Preferably, the manufacturing process of a front stop can be optimized, accelerating the production of the front stop itself, as it can be manufactured using a plastic injection molding process. This process can significantly reduce costs compared to conventional milling methods. Designing the part as an injection-molded part offers the opportunity to optimize the downstream assembly process in addition to the weight savings associated with the material.

[0010] In particular, the front stop is designed in several parts. The front stop can preferably be designed to be movable or foldable, for example in a two-part design. The two parts or halves can preferably be injection-molded as a whole and, for example, only separated during assembly, and then preferably a hinge can be produced. Due to this foldability, the front part of the stop can be placed on a centering device of the front stop cross member, preferably a cylindrical shaft. For example, the centering device can be a screw head of a cylinder head screw. By positioning in this way, any number of front stops on the front stop cross member, preferably a front stop shaft, can be precisely aligned axially and / or radially. The parts of theThe front stops themselves are preferably exactly the same and subject to the same tolerances, since they are preferably all manufactured using the same injection mold.

[0011] Due to the multi-part design of the front stop, particularly its two-part and foldable design, it can be conveniently removed from the front stop crosspiece, preferably the front stop shaft, at any time and precisely repositioned without drilling, even during servicing. In particular, the front stops are easily removable from the machine and can be replaced with other front stops as required within the machine without having to dismantle the entire front stop crosspiece or front stop shaft. The front stop contributes significantly to cost savings in the printing press value chain thanks to its optimized manufacturing and assembly costs.

[0012] In particular, the parts of a front stop, for example, two halves, are connected or clamped together with a screw connection. Alternatively or additionally, a click and / or snap connection is also possible, for example, where one half snaps into the other half. This is particularly advantageous because the front stop can be assembled completely tool-free, and the assembly process can be completed even faster. As a further development, a vibrator could also be assigned to the front stop to oscillate the stop surface for sheets.

[0013] Embodiments of the invention are illustrated in the drawings and are described in more detail below.

[0014] They show: Fig. 1: a schematic representation of a delivery in side view; Fig. 2: a multi-part front stop; Fig. 3: the assembled front stop; Fig. 4: the front stop during assembly; Fig. 5: a side view of the front stop; Fig. 6: a front stop shaft with mounted front stops.

[0015] In Fig. 1 is a delivery of a sheet-fed machine, here in particular a sheet-fed printing press, specifically a sheet-fed offset rotary printing press, preferably in a unit and in-line design. The sheet-fed machine could, however, also be a rotary die-cutter or similar with a corresponding delivery. The machine can be operated using the offset process, although other printing processes such as screen printing can also be integrated into the machine. In the units of the machine (not shown in detail), the sheets 01 are gripped at the leading edge by gripper systems of rotating cylinders and transferred between the cylinders in the gripper closure. In particular, the sheets 01 are inked in printing units in a printing nip formed by a printing cylinder 02 and a blanket cylinder, each with a printing ink to match the motif.Furthermore, one or more coating units can be provided, in which the sheets 01 can also be coated in a printing nip between a printing cylinder 02 and a coating forme cylinder. The cylinders arranged in the machine can be single- or multiple-size, whereby a single-size cylinder can accommodate at least one sheet 01 and a double-size cylinder can accommodate at least two sheets 01 of the maximum format on the circumference. The machine can also contain a turning device for turning the sheets 01 in a perfecting mode while the machine is running. Furthermore, finishing devices or finishing units, such as cold foil units, can also be integrated into the machine.

[0016] In particular, the machine has a drive gear train which, particularly preferably as a continuous drive gear train, drives the sheet guiding cylinders, such as printing cylinders 02, transfer cylinders or transfer drums between printing cylinders 02 of the machine. For this purpose, the sheet guiding cylinders on the drive side of the machine each have intermeshing gears which form a drive gear train. The drive gear train is driven by at least one main drive motor. The continuous drive gear train drives the sheet guiding cylinders about their respective rotational axes. Preferably, the blanket cylinders of the printing units are also driven by the drive gear train. Other rotating bodies or rollers of the machine or units or printing units, such as inking units or inking and dampening units, can also be driven at least temporarily by the drive gear train, whereby these can also be designed so that they can be coupled to the drive gear train.

[0017] For example, an individual drive, in particular a direct plate cylinder drive, can be assigned to one or each plate cylinder of a printing unit. Direct drives are, in particular, individual drives whose rotors are aligned and concentric, preferably directly mounted to the assigned cylinders. During printing, the respective plate cylinder is then electronically synchronized with the blanket cylinder, which is preferably driven by the main drive motor via the drive gear train. For this purpose, a rotary encoder can be assigned to the plate cylinder and / or blanket cylinder, which can be connected to a control unit of the printing unit and / or a machine control system. Alternatively, the plate cylinder(s) can also be driven via the drive gear train from the main drive motor.

[0018] The machine can preferably be equipped with an inline quality control device. For example, an inspection system for checking for a flawless print image can be assigned to the last printing cylinder 02 of the machine. Furthermore, the machine control system is preferably provided for controlling the machine, which preferably communicates with a control station of the machine. For example, a rotary angle sensor on the last sheet-guiding cylinder of the machine, here the last printing cylinder 02, can detect a machine angle and transmit it to the machine control system or be connected to the inline quality control device, for example, the inspection system.

[0019] The delivery is arranged downstream of the last sheet guiding cylinder of the machine, here in particular the last double-size impression cylinder 02, in the transport direction T of the sheets 01. The delivery comprises in particular two drive sprockets 03 of a sprocket main shaft 04 and two deflection sprockets 05 of a further axis 06. The drive sprockets 03 are coaxial and spaced from one another, preferably fixedly assigned to the sprocket main shaft 04, which is preferably connected to a gear of the drive gear train. The sprocket main shaft 04 can, for example, be mounted in the substructure module of the last unit, in particular the last printing or coating unit of the press. The delivery preferably has a separate frame and can also be designed with a delivery extension.

[0020] The deflection sprockets 05 of the delivery are preferably also coaxial and spaced from one another, preferably fixedly assigned to the further axis 06. An endless chain 07, which forms a chain circle, is driven and guided via the drive sprockets 03 and the deflection sprockets 05. Gripper carriages 08 holding sheets 01 are arranged at a constant distance from one another between the two chain circles, which are preferably guided laterally on the frame. The drive sprockets 03 and the deflection sprockets 05 and the chains 07 wrapping around them, together with the gripper carriages 08, form a sheet conveying system which can also contain other elements or consist of other elements. In particular, the deflection of the gripper carriages 08 can also be achieved by deflection guides instead of by the deflection sprockets 05.The endlessly rotating driven and guided gripper carriages 08 have gripper fingers that can be moved against fixed impacts to take over the sheets 01 preferably at the front edge of the last sheet guide cylinder, in particular the last printing cylinder 02.

[0021] In the delivery, for example, sheet guiding devices, particularly preferably pneumatically actuated sheet guide plates 09, for the sheets 01 held here by the gripper carriages 08 are arranged in the ascending branch of the circulating chains 07. A sheet guide plate 09 can, for example, have a surface facing the gripper carriages 08 with air nozzles and can preferably extend across the width of the machine. The air nozzles can be supplied with blast air and / or suction air. In addition, one or more dryers 10, for example UV, IR and / or hot air dryers, and / or a powdering device 11 for powdering the sheets 01 can be provided in the delivery, particularly above the sheet transport path. The delivery also has a stacking area above which the gripper carriages 08 release the sheets 01 for storage.Furthermore, a non-stop device with an auxiliary pile carrier, in particular a non-stop roller blind, which can be moved into the pile area, for example in the transport direction T of the sheets 01, for uninterrupted pile changing could be arranged in the delivery.

[0022] In the stacking area of ​​the delivery, a stacking plate 13 is provided, which is held by lifting chains 12 and is height-adjustable by a stacking lift drive (not shown). The sheets 01 transported to the stacking area and released by the gripper carriages 08 sink under the effect of gravity, possibly assisted by blast air devices from above, onto the stacking plate 13 or onto a pallet positioned on the stacking plate 13, thereby forming a delivery stack 14. The delivery stack 14 is lowered by the stacking lift drive during the sheet depositing process in such a way that the stack surface forms an at least approximately constant deposit level for the incoming sheets 01. In particular, the stacking lift drive is controlled, for example, by a preferably capacitive stacking lift sensor.

[0023] In the delivery, a sheet brake 15 is arranged upstream of the delivery pile 14 in the transport direction T. This sheet brake takes the sheets 01 to be deposited from the gripper carriages 08 and, after their release, decelerates them from machine speed to delivery speed. For this purpose, the sheet brake 15 can, in particular, comprise axially adjustable braking stations, which can have suction rings operating with suction air or suction belts to decelerate the sheets 01. After deceleration by the sheet brake 15, the sheets 01 are deposited on the delivery pile 14 aligned with format-independent, fixed front and format-adjustable rear and / or side edge stops. The side edge stops can be designed as oscillating side straighteners.

[0024] To form an accurate delivery stack 14, the sheets 01 released by the gripper carriages 08, braked and still having a residual speed, strike with their leading edge one or more front stops 16, at which they are aligned. Preferably, several of these front stops 16 are arranged across the machine width, which are permanently assigned to a front stop crossmember, in particular a front stop shaft 17, arranged horizontally and transversely to the transport direction T. For example, in a medium-format printing press, four or more front stops 16 can be arranged across the machine width. The front stop crossmember, in particular front stop shaft 17, can be accommodated in the delivery so that it can be moved or pivoted. A drive for moving or pivoting the front stop crossmember, in particular the front stop shaft 17, is not shown.In particular, exactly one front stop cross member, in particular front stop shaft 17, is arranged on the stack side of the delivery stack 14 facing in the transport direction T.

[0025] For example, the front stop cross member, in particular the front stop shaft 17, can be pivoted counterclockwise for quality assurance for sample sheet removal, so that the front stops 16 arranged on the front stop cross member, in particular the front stop shaft 17, are pivoted together from the delivery pile 14. The front stops 16 are preferably moved to a position below the storage level, i.e. below the delivery pile surface. By pivoting the front stops 16, the sample sheet to be ejected does not hit the front stops 16 and can therefore be removed from the delivery pile 14. For sample sheet removal, further elements (not shown) can be provided, such as sheet holders on the front edge or front and rear edges for subsequent sheets 01. The production orMounting of a front stop 16 for the stop device of the delivery comprising the front stop cross member, in particular the front stop shaft 17, can be carried out as follows.

[0026] The Fig. 2 shows an injection-molded front stop 16 in its tool position, ie as it falls out of the injection mold. The front stop 16 is in particular designed in several parts, ie comprises at least or exactly two parts or even more parts. These parts are assembled or joined together to form a front stop 16. The front stop 16 here comprises in particular a front part 18 and a rear part 19 and, for example, a connecting piece 20. The front part 18 here has the downward-facing stop surface 21, against which the sheets 01 impact in the installed position. The parts are designed here in such a way that they can be connected in an articulated manner. For example, the parts, here in particular the front part 18 and the rear part 19, each have a bore 22. In particular, the connecting piece 20 is removed during assembly and both parts, ieThe front part 18 and the rear part 19 are assembled by means of a cylindrical pin 23, after the holes 22 are arranged overlappingly, in a form-fitting manner to form a hinged front stop 16, thus creating, in particular, a hinged connection or a hinge. Particularly preferably, at least one part, here in particular the front part 18, has a centering means, for example, a recess or a centering hole 24, via which the part, here the front part 18 and thus the entire front stop 16, can be aligned during assembly.

[0027] The Fig. 3 shows the front stop 16, which is composed of several parts, here at least the front part 18 and the rear part 19, in its functional or installed position without the front stop cross member, here the front stop shaft 17. The parts, here the front part 18 and the rear part 19, are articulated to one another via a cylindrical pin 23 inserted in the bores 22. Alternatively, the parts could also be articulated to one another, for example via a flexural joint. Such a flexural joint can be formed, for example, by appropriate dimensioning or a suitable wall thickness in the movable area. The parts of the front stop 16, here the front part 18 and the rear part 19, are articulated and / or connected for fixing to the front stop cross member, in particular the front stop shaft 17.

[0028] The Fig. 4 shows the front stop 16 during assembly. The assembly of the front stop 16 takes place by displacing at least one of the articulated parts, here the rear part 19, around the front stop cross member, here in particular the front stop shaft 17, so that in particular both parts, here the front part 18 and the rear part 19, encompass the front stop cross member, here in particular the front stop shaft 17, and in particular contact them simultaneously. In particular, the rear part 19 is folded away here and the front part 18 with the centering bore 24 is placed and thus aligned on a centering element, in particular on the screw head of a centering screw 25, which has preferably been screwed into the front stop cross member, here in particular the tubular or front stop shaft 17.This results in a positive assignment of at least one part, in particular of the front part 18, to the front stop cross member, here in particular the front stop shaft 17. The centering element, here in particular the centering screw 25, is preferably provided or arranged on the side of the front stop cross member, in particular the front stop shaft 17, facing the delivery stack 14.

[0029] In particular, the displaceable or displaced part of the front stop 16, here the rear part 19, has a recess or bore through which a fixing means, in particular a screw 26, is inserted. The fixing means, in particular the screw 26, thus extends in particular through the displaceable or displaced part, here the rear part 19. The fixing means is designed to connect several parts, here the rear part 19 with the front part 18, of the front stop 16. The fixing means is preferably designed for the releasable fixing of the parts, in particular the front part 18 and rear part 19, of the front stop 16. Alternatively or additionally, a fixing means could also be designed as a locking or snap-in connection.

[0030] The Fig. 5 shows the side view of a front stop 16. A part of the front stop 16, here the front part 18, has a rectangular recess 27, for example. A counterpart for the fixing means can be positioned in this recess 27, in particular in a form-fitting manner. In particular, a nut 28 can be placed in a form-fitting manner in the recess 27 of one part, here the front part 18, of the front stop 16 and connected to the screw 26 passing through the other part, here the rear part 19, of the front stop 16. For example, a hexagon or square nut 28 can be inserted laterally in a form-fitting manner into the recess 27 of the front part 18 of the front stop 16. The nut 28 is thus automatically secured against rotation. Subsequently, the screw 26, here a cylinder head screw, for clamping the rear part 19 of the front stop 16 can only be mounted by means of a tool by engaging the nut 28.

[0031] The Fig. 6 shows fully assembled front stops 16 on a front stop cross member, here the front stop shaft 17. For example, four front stops 16 are arranged on the front stop cross member, here the front stop shaft 17. After the front stops 16 have been positioned on the front stop cross member, here on the front stop shaft 17, they are tightened with a defined torque, in particular with the fixing means, here for example the screw 26, in particular a cylinder head screw.

[0032] The front stops 16 each have a stop surface 21 aligned opposite to the transport direction T of the sheets 01, which contact the front edge of the sheets 01 during their placement or alignment. Preferably, several front stops 16 are constructed in this way, particularly symmetrically to the format center. A front stop 16 can be replaced or retrofitted at any time on a front stop crosshead, here the front stop shaft 17.

[0033] The stop device or the front stop cross member, in particular the front stop shaft 17, is assigned a stack stroke sensor, which is arranged adjacent to a front stop 16 and is in particular fixedly connected to the front stop cross member, in particular the front stop shaft 17. The stack stroke sensor can therefore be displaced or rotated with the front stop cross member, in particular the front stop shaft 17, for example, for sample sheet removal. The stack stroke sensor is connected, for example, via a control device such as the machine control system, to the stack stroke drive of the stacking plate 13 for its height adjustment, in particular as described above. List of reference symbols

[0034] 01 Sheet 02 Printing cylinder 03 Sprocket 04 Sprocket main shaft 05 Sprocket 06 Axle 07 Chain 08 Gripper carriage 09 Sheet guide plate 10 Dryer 11 Powder device 12 Lifting chain 13 Stacking plate 14 Delivery pile 15 Sheet brake 16 Front stop 17 Front stop shaft 18 Front part 19 Rear part 20 Connecting piece 21 Stop surface 22 Bore 23 Cylinder pin 24 Centering hole 25 Centering screw 26 Screw 27 Recess 28 Nut Transport direction

Claims

1. Delivery of a sheet-processing machine, in particular a printing press or punching machine, with a stop device with at least one front stop (16) assignable to a front stop cross member (17), characterized in that the front stop (16) comprises several articulated and / or connected parts (18, 19) for fixing to the front stop cross member (17).

2. Display according to claim 1, wherein the parts (18, 19) of the front stop (16) contact the front stop cross member (17) and / or jointly encompass it.

3. Display according to claim 1 or 2, wherein the parts (18, 19) of the front stop (16) are connectable and / or connected in a form-fitting manner, in particular via a solid-body joint or via a hinge connection (22, 23).

4. Display according to claim 1, 2 or 3, wherein several parts (18, 19) of the front stop (16) each have a bore (22) which can be connected and / or are connected to form a hinge, in particular via a cylindrical pin (23).

5. Delivery according to claim 1, 2, 3 or 4, wherein a front part (18) of the front stop (16) has a stop surface (21) for sheets (01) and / or a centering means (24).

6. A display according to claim 1, 2, 3, 4 or 5, wherein the front stop cross member (17) has at least one centering element (25), in particular on the side facing a display stack (14), for at least a part (18) of the front stop (16).

7. Display according to claim 1, 2, 3, 4, 5 or 6, wherein one or more parts (18, 19) of the front stop (16) are made of injection molding.

8. Display according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the parts (18, 19) of the front stop (16) encompassing the front stop cross member (17) are connectable and / or connected to one another via fixing means (26, 28).

9. Display according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein in at least one part (18) of the front stop (16) a particularly form-fitting recess (27) is provided for a nut (28) receiving a screw (26) passing through another part (19) of the front stop (16).

10. Display according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein at least one part (18) or the front stop (16) can be positively and / or releasably assigned to the front stop cross member (17).

11. Method for producing and / or assembling a front stop (16) of a stop device for a delivery of a sheet-processing machine, in particular according to one of the preceding claims, characterized in thatthe front stop (16) is assigned to a front stop cross member (17) by means of several articulated and / or connected parts (18, 19).

12. The method according to claim 11, wherein at least one part (18) of the front stop (16) has a centering means (24) which is assigned, in particular in a form-fitting manner, to a centering element (25) of the front stop cross member (17).

13. Method according to claim 11 or 12, wherein the parts (18, 19) are guided around the front stop cross member (17) while displacing at least one part (19) and are then connected to one another.

14. Method according to claim 11, 12 or 13, wherein a nut (28) is placed in a particularly form-fitting recess (27) of a part (18) of the front stop (16) and a screw (26) passing through the other part (19) of the front stop (16) is connected to the nut (28).

15. The method according to claim 11, 12, 13 or 14, wherein one or more parts (18, 19) of the front stop (16) are injection molded.

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