Display and procedure for operating a display

Abstract

Delivery unit for a sheet processing machine with a format-adjustable sheet brake (15), wherein at least one frame-fixed guide rail (25) and a carriage (24) guided on the guide rail (25) and carrying the sheet brake (15) are provided, wherein the carriage (24) has a guide block (31) cooperating with the guide rail (25), wherein a sliding element (32) is provided between the guide block (31) and the guide rail (25), and wherein the sliding element (32) has a knife edge (34) in the contact area with the guide rail (25) in one or both directions of movement (T).

Description

[0001] The invention relates to a delivery unit for a sheet-processing machine with a format-adjustable sheet brake and a method for operating a delivery unit for a sheet-processing machine with a format-adjustable sheet brake.

[0002] From DE 25 44 566 A1, a sheet feeder for sheet-fed printing presses is known, wherein a suction wheel shaft is supported by two bearing blocks. Adjustment is effected by two threaded spindles on which the bearing blocks are mounted.

[0003] From DE 102 24 299 B4, a boom of a machine processing flat printing materials is known, wherein sheet brakes are arranged in such a way that a take-up level and a delivery level can be adjusted to a position maintained during printing, and wherein the sheet brakes are supported by a brake carriage which is equipped with rollers and is movable along a guide.

[0004] From DE 10 2004 011 114 A1, a substrate processing machine is known, wherein an unloading device is adjustable in a sheet feeder of the substrate processing machine and / or arranged close to the trailing edge of the sheet stack. For sheet format-dependent adjustment, the unloading device is attached together with both sheet trailing edge stops and the sheet brake to a sliding or rolling carriage, i.e., to a carriage or a slide.

[0005] From DE 10 2008 031 710 A1, a sheet feeder of a sheet processing machine, in particular a rotary printing press, is known, wherein the sheet feeder has several sheet brake elements arranged above and in front of a stack of printed sheets, which can be operated with suction air or blowing air and are operatively connected to a pressure source, and wherein the sheet brake elements are received in a carriage of the sheet feeder, which is adjustable both in and against the sheet travel direction of the printed sheets.

[0006] From EP 3 704 047 B1 a sheet processing machine with a delivery and a method for adjusting a brake station of a sheet brake in a delivery is known, wherein an adjusting element connected to a brake station is provided, which is guided on a guide traverse by means of at least one flat surface and thereby supports the brake station, wherein the guide traverse has a downwardly open U-profile.

[0007] In known devices, the sliding guide is designed such that two steel parts, in particular a guide rail and a guide block, slide directly against each other, i.e., rub against each other. A disadvantage is that sliding guides with two steel friction partners have a very high coefficient of friction and, under additional unfavorable conditions such as corrosion and / or contamination, tend to wear prematurely. For such a guide to have a longer service life, it would have to be very intensively maintained, cleaned, and lubricated.

[0008] The invention is based on the objective of creating an alternative display or an alternative method for operating a display. In particular, the wear of the guide elements is to be eliminated by means of an optimized sliding pairing, or the service life of the functional parts is to be increased.

[0009] The problem is solved according to the invention by the features of an independent claim.

[0010] The advantages achievable with the invention consist in particular of the creation of an alternative display or an alternative method for operating a display. In particular, the wear of the guide elements is eliminated by an optimized sliding pairing, and the service life of the functional parts is increased.

[0011] Preferably, a sliding element is used, which is, for example, positively inserted into a guide block. This sliding element is preferably made of a plastic material typical for sliding guide applications. For example, Teflon can also be used as the sliding material. By decoupling the steel parts and creating a plastic-steel pairing, the service life of the friction partners is advantageously increased many times over, while wear is simultaneously reduced considerably. Furthermore, the sliding element used to decouple the steel-steel pairing reduces or eliminates maintenance, cleaning, and lubrication measures. The service life of the parts is increased many times over, so that repair and service interventions are also reduced or eliminated.With a sliding guide featuring a plastic-steel pairing and the resulting significantly reduced coefficient of friction compared to steel, the force and load required on the format adjustment actuator are also reduced. This effect further contributes to extending the service life of the components involved in the guide. Finally, it also enables the use of heavier sheet brakes.

[0012] Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

[0013] They show: Fig. 1 a schematic representation of a display in side view; Fig. 2 a bow brake guided on two guide rails; Fig. 3 a slide guided on a guide rail via a sliding element; Fig. 4 a guide block with sliding element.

[0014] The Fig. Figure 1 shows the delivery unit of a sheet-fed printing press, specifically a sheet-fed offset rotary printing press, preferably in a modular or in-line configuration. The sheet-fed printing press could also be a rotary die-cutter or similar machine with a corresponding delivery unit. The machine can be operated using offset printing, although other printing processes such as screen printing may also be provided for or integrated into the machine. In the machine's printing units (not shown), the sheets 01 are gripped at the leading edge by gripper systems of rotating sheet guide cylinders and transferred between the sheet guide cylinders in the gripper closure. Specifically, the sheets 01 are inked with a single printing ink according to the design within a printing gap formed by a printing cylinder 02 and a rubber cylinder.Furthermore, one or more coating units can be provided, in which the sheets 01 can also be coated in a printing gap between a printing cylinder 02 and a coating cylinder. The cylinders arranged in the machine can be single- or multi-sized, with a single-sized cylinder being able to accommodate at least one sheet 01 and a double-sized cylinder at least two sheets 01 of maximum format circumferentially. The machine can also include a perfecting device for turning the sheets 01 in a perfecting mode during machine operation. Finishing units or finishing devices, such as cold foil units, can also be integrated into the machine.

[0015] The delivery unit is located downstream of the last sheet guide cylinder of the machine, in particular the last double-sized printing cylinder 02, in the transport direction T of the sheets 01. The delivery unit comprises, in particular, two drive sprockets 03 of a sprocket main shaft 04 and two deflection sprockets 05 of a further shaft 06. The drive sprockets 03 are coaxial and spaced apart from each other, preferably fixedly assigned to the sprocket main shaft 04, which is preferably connected to a gear of the drive sprocket train. The sprocket main shaft 04 can, for example, be mounted in the base module of the last unit, in particular the last printing or coating unit of the machine. Preferably, the delivery unit has a separate frame or frame components and can also be designed with a delivery extension.

[0016] The deflection sprockets 05 of the delivery unit are preferably also coaxial and spaced apart from each other, preferably fixedly assigned to the further axis 06. An endless chain 07, forming a chain circle, is driven and guided by the drive sprockets 03 and the deflection sprockets 05, respectively. Between the two chain circles, which are preferably guided laterally on the frame, gripper carriages 08 holding the sheets 01 are arranged at a constant distance from each other. The drive sprockets 03 and the deflection sprockets 05 and the chains 07 encircling them, together with the gripper carriages 08, form a sheet conveying system, which may also include or consist of other elements. In particular, the deflection of the gripper carriages 08 can be effected by deflection guides instead of by the deflection sprockets 05.The continuously rotating, driven and guided gripper carriages 08 have gripper fingers movable against fixed impacts for taking over the sheets 01 preferably at the leading edge of the last sheet guide cylinder, in particular the last printing cylinder 02.

[0017] In the delivery unit, for example, sheet guide devices, preferably pneumatically actuated sheet guide plates 09, are arranged in the ascending branch of the circumferentially guided chains 07 for the sheets 01 held here by the gripper carriages 08. A sheet guide plate 09 can, for example, have a surface facing the gripper carriages 08 with air nozzles and preferably extend over the width of the machine. The air nozzles can be supplied with blown 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 the sheets 01 can be provided in the delivery unit, particularly above the sheet transport track. The delivery unit further has a stacking area above which the gripper carriages 08 release the sheets 01 for placement.Furthermore, a non-stop device could be arranged in the display area with, for example, an auxiliary stacking carrier, in particular a non-stop roller blind, which can be inserted into the stacking area in the transport direction T of sheet 01, for uninterrupted stack changes.

[0018] In the stacking area of ​​the delivery unit, a stacking plate 13, held by lifting chains 12, is provided and is height-adjustable by a stacking lift drive (not shown). The sheets 01, transported and released to the stacking area by the gripper carriages 08, fall under the influence of gravity, possibly assisted from above by compressed air devices, onto the stacking plate 13 or onto a pallet positioned on the stacking plate 13, thereby forming a delivery stack 14. During the sheet placement process, the delivery stack 14 is lowered by the stacking lift drive such that the stack surface forms an at least approximately constant placement level for the incoming sheets 01. In particular, the stacking lift drive is controlled, for example, by a preferably capacitive stacking lift sensor.

[0019] In the delivery section, a sheet brake 15 is positioned upstream of the delivery stack 14 in the transport direction T. This brake takes the sheets 01 to be laid down from the gripper carriages 08 and, after their release, decelerates them from machine speed to delivery speed. After deceleration by the sheet brake 15, the sheets 01 are aligned against fixed front and adjustable rear and / or side edge stops, which are independent of the format, and laid down on the delivery stack 14. The side edge stops can be designed as oscillating side pushers. The format setting can be controlled, for example, from a machine control station via the machine control system.

[0020] To form an accurate delivery stack 14, the sheets 01, released by the gripper carriages 08, which have been slowed down and still retain some residual speed, strike one or more front stops 16 with their leading edge, where they are aligned. Preferably, several of these front stops 16 are arranged across the width of the machine and are rigidly assigned to a front stop shaft arranged horizontally and transversely to the transport direction T. The front stop shaft can, for example, be displaceable or pivotable within the delivery unit for the purpose of removing a test sheet.

[0021] The Fig. Figure 2 shows a perspective view of a sheet brake 15, which can be adjusted by a drive (not shown), for example as described above. The sheet brake 15 can, in particular, comprise axially adjustable braking stations 17, which can have braking elements, for example, suction rings operating with suction air or, in particular, suction or braking bands 18 for decelerating the sheets 01. The braking stations 17 are preferably positioned on a respective lateral, usually unprinted, sheet edge, on pressure-free corridors, and / or on sufficiently dried ink areas. The repositioning can preferably be motorized. For example, an actuator, particularly via spindles, can reposition the braking stations 17. Unneeded braking stations 17 can be deactivated and / or moved out of the sheet format area.

[0022] A braking element, here a brake band 18, preferably interacts pneumatically with the sheets 01 transported via the sheet brake 15. Specifically, the sheets 01 are drawn into contact with a brake band 18 and / or held in place by suction air, so that contact is established between the brake band 18 and the respective sheet 01. The brake band 18 moves at least intermittently at a lower speed than the machine speed and decelerates each sheet 01 released by the gripper carriage 08 accordingly. Preferably, the brake band 18 is driven dynamically and / or periodically between at least approximately the machine speed and a lower delivery speed. As a further development, catching elements, such as suction rings, could also be arranged upstream of the braking elements, here the brake bands 18.

[0023] The sheet brake 15 is housed in a separate frame comprising two laterally arranged slides and is designed to be movable in and against the transport direction T of the sheets 01 for adjustment to different sheet formats. Downstream with respect to the transport direction T of the sheets 01, i.e., on a side facing the stacking area, a crossbeam is preferably arranged across the machine width, which here is designed as a trailing-edge crossbeam 19 and is associated with the sheet brake 15. The trailing-edge crossbeam 19 preferably carries several trailing-edge stops 20, each of which is pivotably mounted about a pivot axis oriented in the transport direction T of the sheets 01. By moving the sheet brake 15 in or against the transport direction T, the sheet brake 15 and the trailing-edge stops 20 are jointly adjusted to the current sheet format.

[0024] Preferably, the trailing edge traverse 19 and / or a further traverse 21 of the sheet brake 15 is rigidly connected to the respective plates 22 arranged laterally in the area of ​​the delivery frame. Within or outside the area of ​​a maximum sheet format width, a guide traverse 23 for the brake stations 17 can be connected to or supported by the plates 22. Preferably, the trailing edge traverse 19 and / or the further traverse 21, or connecting elements, extend beyond the plates 22 such that they pass through openings in the frame wall of the lateral delivery frame. The frame wall is the lateral vertical wall of the delivery area that defines the delivery area. Particularly preferably, the frame wall is a main frame wall or forms a plane with the wall of the delivery area that guides the chains 07.The arc brake 15 is received, i.e. supported, on each side by a slide that can be moved horizontally.

[0025] Preferably, the trailing edge crossbeam 19 and / or the further crossbeam 21 or a connecting element is mounted outside the frame wall by a side plate 24 of a carriage. Each carriage, and in particular each side plate 24, is supported so as to be displaceable relative to the frame wall. The side plates 24, which are preferably arranged on both sides outside the frame wall, are held or mounted so as to be displaceable or slidable relative to the frame wall, particularly in and against the direction of transport T. The carriages of the bow brake 15, here comprising the side plates 24, are mounted on guide rails 25 fixed to the frame. Preferably, further protective elements are provided to encapsulate the elements that penetrate the frame wall.

[0026] The illustrated sheet brake 15, for example, comprises four braking stations 17, which can be axially displaced or moved along the guide traverse 23, arranged transversely to the transport direction T, by an actuator. The guide traverse 23 is preferably connected to the side plates 22 and thus fixed to the frame but adjustable in format. The guide traverse 23 extends at least over the maximum sheet format to be processed by the machine and supports all braking stations 17 of the sheet brake 15. The actuator for axial adjustment of the braking stations 17 can, for example, have spindle drives 26 arranged outside the plates 22, which can be controlled independently of one another and are each assigned to a braking station 17. For example, the spindle drives 26 are arranged outside the frame wall.Preferably, the spindle drives 26 can be attached, in particular screwed, outside the frame wall on a side plate 24, for example on the operator side of the machine.

[0027] The arc brake 15 further comprises a first square shaft drive 27 for driving all brake bands 18 and preferably a second square shaft drive 28 for pneumatically controlling all brake bands 18. A servo motor 29, for example, can be used as the drive for the square shaft of the first square shaft drive 27. Preferably, the servo motor 29 can be mounted, in particular screwed, outside the frame on a side plate 24, for example, located on the drive side of the machine. Furthermore, the drive can interact with a control device, for example, the machine control, via which a desired deposition speed and / or, if necessary, the movement of the brake bands 18 can be set and modified. Thus, the arc brake 15 with the brake stations 17 can be adapted to different pressure conditions. Alternatively, a separate drive could also be assigned to each brake station 17.

[0028] The square shaft of the second square shaft drive 28 can, for example, be driven by a servo motor 30 at a single speed, i.e., in time with the incoming sheets 01. Preferably, the servo motor 30 can be mounted, in particular screwed, outside the frame on a side plate 24, for example, located on the drive side of the machine. The drive movement of the servo motors 29, 30 is preferably adjustable and / or synchronizable with the sheet sequence. For example, a synchronous pneumatic control of one or more pneumatic connections, in particular the control of the suction air supply, the brake bands 18 of a brake station 17, and in particular all brake stations 17 simultaneously, can be carried out by means of a rotating rotary valve.

[0029] The guide rails 25 for holding and guiding the carriages, here comprising the side plates 24 of the bow brake 15, are preferably fixed to the outside of the frame wall of the delivery, for example by screws. A guide rail 25 has a flat and preferably horizontal surface for the sliding guidance of a carriage of the bow brake 15. The guide rails 25 are thus fixed to the frame in the direction of transport T of the bow 01 and are generally made of steel. A carriage, here comprising a side plate 24, has at least one guide block 31 above the guide rail 25 and in the guide plane of the guide rail 25. The guide block 31 is preferably also made of steel. A sliding element 32 is provided between a guide block 31 and a guide rail 25. Such a sliding element 32 is preferably interchangeably assigned to a guide block 31.Preferably, the contour of the sliding element 32 is machined into the guide block 31, for example by milling, and the sliding element 32 is formed to fit the guide block 31 in a form-fitting manner. In particular, the sliding element 32 contains plastic, especially polytetrafluoroethylene (Teflon), or consists of plastic, especially polytetrafluoroethylene (Teflon).

[0030] The carriages of the sheet brake 15 are rigidly connected to one another via the trailing edge traverse 19 and / or the further traverse 21 or connecting elements. The carriages, here comprising the side plates 24, are thus each supported by a guide block 31 and a sliding element 32 on a frame-mounted guide rail 25. Parallel to the flat or planar surface, a guide rail 25 has, in particular, a similarly flat surface on the opposite, downward-facing side. A carriage, here in particular a side plate 24, preferably comprises at least one roller 33, which engages the downward-facing surface of a guide rail 25. Here, two such rollers 33 are rotationally movably assigned to each side plate 24, which roll at a distance from each other on the downward-facing surface of the guide rail 25 when moved in or against the transport direction T of the sheet 01.

[0031] The Fig. Figure 3 shows a carriage guided by a sliding element 32 on a guide rail 25, here comprising a side plate 24 and a guide block 31. The sliding element 32 rests directly on the frame-mounted guide rail 25. The sliding element 32 sits, in particular, flat against the guide rail 25 and is pushed across the surface of the guide rail 25 when moved, especially when the sheet brake 15 is adjusted. Furthermore, the sliding element 32 is preferably designed such that it has a particularly sharp and / or outwardly angled cutting edge 34 at each end. This cutting edge 34 can be used to scrape or push away contaminants from the guide rail 25. Removing powder deposits or contaminants from the guide rails 25 reduces or prevents wear. This self-cleaning effect of the guide reduces or eliminates the need for maintenance or cleaning.The side plate 24 can carry further functional elements, in particular for the sheet brake 15. For example, the drive for format adjustment (not shown) can act on the respective carriage, in particular on the respective side plate 24, in particular via spindles.

[0032] The Fig.Figure 4 shows a guide block 31 with a sliding element 32, for example as described above. The sliding element 32, in particular made of plastic, can be inserted into the preferably milled guide block 31, which is manufactured with the corresponding counter contour, by means of a positive fit. The positively fitted sliding element 32 is thus preferably interchangeably assigned to the guide block 31, so that, for example, in the event of wear, particularly of the plastic, only the guide block needs to be replaced. The sliding element 32 creates contact between the plastic and steel as a sliding pair. The guide block 31 with sliding element 32 is mounted on a side plate 24 of the bow brake 15 (not shown here), for example by means of screw connections, and is supported on a guide rail 25 (also not shown).

[0033] In particular, the sliding element 32 preferably has two inclined surfaces on both sides, especially with a sharp transition, forming knife edges 34. This sharp-edged contour of the knife edges 34 removes all deposits and contaminants (e.g., printing powder, paper dust, etc.) by mechanical scraping as it moves along the guide rail 25. The two outwardly angled knife edges 34, which preferably act in both directions of movement and function as scrapers, clean each guide rail 25 at least with every format setting of the sheet brake 15 by the movement of the guide blocks 31. The optimized material and / or the corresponding shape of the sliding components reduces wear and / or increases the service life of the functional parts. Reference symbol list 01 sheet 02 Pressure cylinders 03 Sprocket 04 Main sprocket shaft 05 Sprocket 06 Axle 07 chain 08 Grab cart 09 Curved guide plate 10 dryers 11 Powder dispenser 12 lifting chains 13 stacking plates 14 display stacks 15 Bow brake 16 Front stop 17 Brake station 18 Brake band 19 trailing edge traverse 20 Back edge stop 21 Traverse 22 sign 23 Guide rail 24 side panel 25 guide rail 26 Spindle drive 27 first square shaft drive 28 second square shaft drive 29 Servomotor 30 servo motor 31 guide block 32 sliding element 33 rolls 34 knife edge T Transport direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 25 44 566 A1

[0002] DE 102 24 299 B4

[0003] DE 10 2004 011 114 A1

[0004] DE 10 2008 031 710 A1

[0005] EP 3 704 047 B1

[0006]

Claims

[1] Delivery unit for a sheet-processing machine with a format-adjustable sheet brake (15), wherein at least one frame-fixed guide rail (25) and a carriage (24) guided on the guide rail (25) and carrying the sheet brake (15) is provided and wherein the carriage (24) has a guide block (31) cooperating with the guide rail (25), characterized by , that a sliding element (32) is provided between the guide block (31) and the guide rail (25). [2] Display according to claim 1, wherein the sliding element (32) can be interchangeably assigned to the guide block (31). [3] Display according to claim 1 or 2, wherein the contour of the sliding element (32) is incorporated into the guide block (31), in particular milled. [4] Display according to claim 1, 2 or 3, wherein the sliding element (32) is positively engaged with the guide block (31). [5] Display according to claim 1, 2, 3 or 4, wherein the guide rail (25) and / or the guide block (31) is made of steel. [6] Display according to claim 1, 2, 3, 4 or 5, wherein the sliding element (32) contains plastic, in particular polytetrafluoroethylene (Teflon). [7] Display according to claim 1, 2, 3, 4, 5 or 6, wherein the sliding element (32) has a knife edge (34) arranged in the contact area with the guide rail (25) in one or both directions of movement (T), in particular at an angle to the direction of movement (T). [8] Display according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the carriage (24) has at least one roller (33) which rolls on the side of the guide rail (25) opposite the sliding element (32). [9] Display according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the guide block (31) is mounted on a side plate (24) of the bow brake (15). [10] Method for operating a delivery unit for a sheet-processing machine, in particular according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, with a format-adjustable sheet brake (15), wherein at least one frame-fixed guide rail (25) and a carriage (24) guided on the guide rail (25) and carrying the sheet brake (15) are provided, and wherein a guide block (31) of the carriage (24) is guided by the guide rail (25), characterized by , that the guide block (31) is guided on the guide rail (25) via a sliding element (32). [11] Method according to claim 10, wherein the sliding element (32) is arranged in a form-fitting and / or interchangeable manner on the guide block (31). [12] Method according to claim 10 or 11, wherein the contour of the sliding element (32) is incorporated into the guide block (31), in particular milled. [13] Method according to claim 10, 11 or 12, wherein the guide rail (25) and / or the guide block (31) is made of steel and / or the sliding element (32) contains plastic, in particular polytetrafluoroethylene (Teflon). [14] Method according to claim 10, 11, 12 or 13, wherein the sliding element (32) contacts the guide rail (25) in one or both directions of movement (T) of a format adjustment by means of a knife edge (34) arranged in particular at an angle to the direction of movement (T). [15] Method according to claim 10, 11, 12, 13 or 14, wherein deposits on the guide rail (25) are removed when the slide (24) is moved via the sliding element (32, 34).

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