DE102022118980A1 - Delivery and method for operating a delivery with a stack carrier that can be moved vertically by a stack lifting drive - Google Patents

Abstract

The invention relates to a delivery for a sheet processing machine with a stack carrier that can be moved vertically by a stack lifting drive and with transport systems for transporting sheets in a transport direction to a stacking area and for releasing the sheets in the stacking area above the stack carrier, with at least one side edge stop with at least one displaceable stop element is provided for aligning the falling sheets in the stacking area, the stop element being displaceable above a stack surface that is being formed. The invention also relates to a method for operating a display.

Description

The invention relates to a delivery for a sheet processing machine with a stack carrier that can be vertically displaced by a stack lifting drive and a method for operating a delivery for a sheet processing machine with a stack carrier that can be vertically displaced by a stack lifting drive.

The printed sheets are deposited in a delivery of a printing press. The final alignment of the sheets is carried out in the lateral direction, usually by the laterally arranged side straight pushers, and in the direction of sheet travel by front stops and stops on the suction roller. This means that the falling sheets are placed very precisely on top of each other. A delivery stack is created in which the paper edges lie one above the other in the lateral direction and in the direction of sheet travel with little or no offset.

However, if several different customer orders of the same format are processed and these are then placed on a display stack, strips of paper are usually inserted between the respective orders (for better recognition during further processing). However, an additional assembly, a so-called strip inserter, is necessary for this. This causes additional costs and consumes resources. However, there are also cases in which this type of order separation within a delivery stack is not possible at all due to the intended further processing technology.

For order separation, a non-stop device can also be used instead of a strip inserter. After completing an order, the corresponding delivery stack can be lowered and a new order can be placed on a new stack or on an auxiliary stack carrier of the non-stop device.

From the DE 10 2017 221 434 A1 a display and a method for depositing sheets in a stacking area formed by stops in a display are known, the stops having stop surfaces for falling sheets, the stop surfaces having air-permeable areas and airtight areas, these areas being formed one after the other in the sheet falling direction and where an at least two abutting stack side surfaces air-permeable and / or airtight areas are arranged in at least approximately the same horizontal position.

From the DE 10 2019 125 807 B3 a delivery with a stack carrying device for receiving a stack of sheets is known, with a stack lifting drive acting on traction means for displacing a stack carrier and with a further drive being designed which acts on the traction means for the horizontal displacement of the stack carrier.

The invention is based on the object of creating an alternative display or an alternative method for operating a display. In particular, the stacking process on sheet processing machines should be further improved.

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

The advantages that can be achieved with the invention are, in particular, that an alternative display or an alternative method for operating a display is created. In particular, the stacking process on sheet processing machines is being further improved. A corresponding sheet processing machine, in particular a printing machine, with such a delivery is also provided.

In particular, it is possible to place several orders on a display stack in a visually distinguishable manner, without them being selected, for example, by a strip inserter. If necessary, order separation can preferably be carried out by moving the delivery stack laterally by a fixed amount, for example, preferably once to one side and then to the opposite side for the next order. This creates a clearly visible lateral paper edge offset between the individual orders within a delivery stack. The lateral displacement of the display stack can be carried out electrically, pneumatically, mechanically, etc., particularly preferably even during ongoing production.

In order to separate different print orders or print jobs from one another, packages are preferably placed in the delivery in a way that is particularly visually distinguishable from one another. This is achieved in particular by the horizontal or lateral offset of the packages. The side edges of the finished stack are no longer straight, but rather stepped. For example, an offset of 5 mm can be considered sufficient. A stack carrier, in particular a stack support plate, is preferably stored or moved in such a way that it is displaced laterally by, for example, ± 2.5 mm from its normal position.

So that the display stack can be moved laterally, existing displaceable stop surfaces of side edge stops are pivoted upwards. For this purpose, each stop surface can be fitted with a movable stop element mentes or a paddock or a hanging wedler of one or both side edge stops, in particular side straight pushers, can be connected to one or each actuator, in particular a pneumatic cylinder. The actuator(s) then lift the stop element(s) with the stop surfaces of the side pusher at least in the direction in which the display stack is to be moved. If, for example, the display stack is to be moved towards the drive side of the machine, then at least the stop elements on this drive side are raised. Once the lateral displacement has ended, the stop elements are preferably lowered again. Alternatively, the stop surfaces of all stop elements can also be lifted before moving the display stack to avoid damage, for example. B. to prevent jamming in a pallet when moving.

Advantageously, the solution found is resource-saving, easy to implement and therefore cost-effective. The solution allows a quick lateral stacking offset to be achieved without a lot of time.

Embodiments of the invention are shown in the drawings and are described in more detail below.

• 1 eine Auslage einer bogenverarbeitenden Maschine mit einer Nonstop-Einrichtung;
• 2 eine perspektivische Ansicht eines Stapelhubantriebes für eine Stapeltragplatte in der Auslage;
• 3 eine vergrößerte perspektivische Ansicht der Anbindung und Führung der Stapeltragplatte;
• 4 eine aktorisch verlagerbare Führungsklaue der Stapeltragplatte in vergrößerter perspektivischer Ansicht;
• 5 eine aktorisch verlagerbare Führungsklaue der Stapeltragplatte in Draufsicht;
• 6 einen Ausschnitt einer perspektivischen Ansicht einer Auslage einer bogenverarbeitenden Maschine mit Seitenkantenanschlägen;
• 7 eine vergrößerte perspektivische Ansicht eines Seitenkantenanschlages;
• 8 eine Seitenansicht eines sich während des Ablageprozesses bildenden Bogenstapels;
• 9 eine Rückansicht eines Seitenkantenanschlages mit von Pneumatikzylindern anhebbaren hängenden Anschlagelementen;
• 10 eine perspektivische Ansicht eines über einem Bogenstapel befindlichen Seitenkantenanschlages;
• 11 eine weitere perspektivische Ansicht eines über einem Bogenstapel befindlichen Seitenkantenanschlages.

Show it:

• 1 a delivery of a sheet processing machine with a non-stop device;
• 2 a perspective view of a stack lifting drive for a stack support plate in the delivery;
• 3 an enlarged perspective view of the connection and guidance of the stack support plate;
• 4 an actuatorically displaceable guide claw of the stack support plate in an enlarged perspective view;
• 5 an actuatorically displaceable guide claw of the stack support plate in plan view;
• 6 a detail of a perspective view of a delivery of a sheet processing machine with side edge stops;
• 7 an enlarged perspective view of a side edge stop;
• 8th a side view of a stack of sheets forming during the filing process;
• 9 a rear view of a side edge stop with hanging stop elements that can be lifted by pneumatic cylinders;
• 10 a perspective view of a side edge stop located above a stack of sheets;
• 11 Another perspective view of a side edge stop located above a stack of sheets.

The 1 shows, for example, the stacking area of a delivery 01 of a sheet-processing machine, for example a sheet-fed printing machine, in particular a sheet-fed offset rotary printing machine, preferably in an aggregate and row design, in which the processed, for example printed and / or varnished sheets are stored. To transport the sheets from a last processing station, in particular a last printing or coating unit, of the machine, rotating transport systems are preferably used, for example gripper carriages 02 carrying clamping grippers, of which the sheets are transported fixed at their front edges in the transport direction T to the stacking area. For sheet transport, chain transport systems are further preferably designed with two delivery chains guided laterally on the frame of the delivery 01, between which the gripper carriages 02 are arranged. From the delivery chains, the gripper carriages 02 are guided in particular continuously on a gripper carriage track in the transport direction T to the stacking area or over a delivery stack 03, where the gripper carriages 02 release the sheets for storage.

In the delivery 01, sheet guide plates, not shown, can be arranged below the sheet transport path, which guide the sheets on the way to the delivery stack 03. Such sheet guide plates preferably have at least approximately closed surfaces for sliding and/or floating guidance of the sheets. Preferably, the sheet guide plates can be assigned nozzle openings, in particular Venturi nozzles, for pneumatic guidance of the sheets. The machine can also have a turning device and can preferably be designed to be switchable between the face printing and face and reverse printing operating modes. An air cushion can be formed between the sheet guide plates and the sheets transported over them, especially in the perfecting and reverse printing mode.

In the stacking area of the display 01, a stack support plate 04, which can be vertically displaced by a stack lifting device (not shown), is provided as a stack carrier and can, for example, carry a pallet 05 for receiving the sheets to be displayed. Above or in the stacking area, in particular above the stack support plate 04, the grippers of the gripper carriages 02 open and release the sheets so that they are placed under the effect of gravity, for example, on the stack support plate 04 arranged pallet 05 sink. Above the delivery stack 03, blowing means, for example a blowing frame, preferably with axial fans, can be arranged, which support the depositing movement of the sheets released by the gripper carriages 02.

In the delivery 01, the delivery stack 03 is preferably preceded by a sheet brake 06 with respect to the transport direction T, which takes over the sheets to be deposited from the gripper carriage 02 and, after their release, decelerates them from the machine speed to the delivery speed. A sheet brake 06 can, for example, have pneumatically acting rotating and/or rotating braking elements acting on the underside of the sheet. The slowed down sheets then lie on stop surfaces, in particular of front edge stops 07, preferably under the action of the blown air, and sink onto the pallet 05 or surface of the delivery stack 03. The falling sheets are preferably guided by stop surfaces on the front edge, in particular the front edge stops 07, on the side edges and/or the rear edge. In this way, the display stack 03 is formed on the pallet 05 from sheets placed one on top of the other.

To the extent that the delivery stack 03 increases on the pallet 05, the stack support plate 04 is lowered by the stack lifting drive, so that each sheet to be deposited covers approximately the same falling distance to the surface of the delivery stack 03. A sensor, which preferably detects the upper edge of the display stack 03 and is connected to a common control device, can be arranged to control or regulate the lowering movement of the stack support plate 04. If the display stack 03 has reached a certain or maximum height, the display stack 03 can be delivered without interruption, for example, using a non-stop device 08. The delivery 01 can also be equipped with a logistics system for the preferably automated transport of full and/or empty pallets 05 or can also be designed as a double-stack or multiple-stack delivery.

For uninterrupted stack changing or stack removal, the non-stop device 08 in the delivery 01 has an auxiliary stack carrier that can be moved by a drive, in particular a non-stop roller blind 09. This non-stop roller blind 09 can be inserted or retracted into the stacking area or the sheet fall area via the delivery stack 03 and can be pulled out or moved out of the stacking area in the opposite direction to the insertion direction. In particular, the non-stop roller blind 09 can be moved into the stacking area in the transport direction T to accommodate the sheets that fall during a stack change, with the sheets picked up by the non-stop roller blind 09 forming an auxiliary stack. The non-stop roller blind 09 is here preferably arranged directly below the sheet brake 06 and in particular has a separate auxiliary stack lifting device (not shown) for vertical displacement.

The 2 shows a perspective view of a stack lifting drive for the stack support plate 04 in the delivery 01 of a sheet processing machine, for example as described above. The stack lifting drive preferably effects a vertical displacement of the stack support plate 04 via a traction mechanism. In particular, the stack lifting drive here comprises a shaft 12 which can be rotationally driven or driven by a drive, for example an electric motor 10, and carries coaxially arranged, spaced-apart chain wheels or drive pinions 11. Around the respective Laterally arranged drive pinions 11 are rear lifting chains 13 and front lifting chains 13 guided over further guide pinions 14, which are preferably attached to the stack support plate 04 in the area of the corners. When the shaft 12 rotates caused by the drive, in particular the electric motor 10, the stack support plate 04 can be moved vertically via the lifting chains 13. The stack support plate 04 can be raised vertically or lowered vertically by the lifting chains 13 depending on the control of the drive, for example electric motor 10, connected to the control device, preferably the machine control. The four lifting chains 13 are moved synchronously.

Sheets of different formats can be processed by the delivery 01 or the machine, so that delivery stacks 03 of different sizes can be formed. For example, such display stacks 03 can be picked up as an auxiliary stack by the auxiliary stack carrier (not shown), in particular the non-stop roller blind 09, the non-stop device 08 of the delivery 01 during a vertical displacement of the stack support plate 04. In particular, such an auxiliary stack can continue to grow during a non-stop stack change, with the auxiliary stack carrier, in particular the non-stop roller blind 09, being lowered by the auxiliary stack lifting device. This enables uninterrupted processing of the sheets in the machine.

The stack support plate 04 can be guided for vertical displacement by at least one vertically arranged guide element, the guide element preferably being designed as a guide rail 15. In particular, the stack support plate 04 can be guided vertically here by two spaced-apart vertical guide rails 15, which are preferably on one side of the display stack 03, are preferably arranged below the sheet brake 06, fixed to the frame. The stack support plate 04 is actively displaceable or displaceable horizontally relative to the at least one guide element, here the two guide rails 15, in particular by means of a guide means which is preferably displaceable relative to the stack support plate 04. The stack support plate 04 is preferably mounted or received so that it can be moved horizontally transversely to the transport direction T. The horizontal displaceability of the stack support plate 04 relative to the at least one guide element, in particular the two guide rails 15, can be several millimeters, preferably in both directions. Preferably, the stack support plate 04 can be moved horizontally on both sides transversely to the transport direction T of the sheets, for example 2.5 millimeters each.

The 3 shows an enlarged perspective view of the connection and guidance of the stack support plate 04. The stack support plate 04 in the delivery 01 hangs on the lifting chains 13 and is guided on the preferably two guide rails 15 when moving up and down. This is done with the help of two guide means designed as guide claws 16, which grip around the guide rails 15. The guide claws 16 are movably held firmly on the stack support plate 04 and grip around the guide rails 15 from the outside, preferably on three sides. By means of the guide claws 16, the stack support plate 04 is fixed to the guide rails 15 in all horizontal directions. The guide claws 16 can be assigned to the stack support plate 04 with the same construction but in mirror images of one another.

The 4 shows an actuatorically displaceable guide claw 16 of the stack support plate 04 in an enlarged perspective view. The guide claw 16 is movably assigned to the stack support plate 04 and interacts with the assigned guide rail 15 in every position. In particular, the guide claw 16 is preferably mounted on the stack support plate 04 so that it can rotate about a vertical axis 17. The or each guide claw 16 preferably has a neutral central position, which enables the delivery 01 to be operated without lateral offset in a selectable operating mode. From this neutral central position, a guide claw 16 can be displaced horizontally on both sides, ie towards and away from the guide rail 15. The guide claws 16 can preferably be held in the respective neutral central position by, for example, spring-loaded ball pressure pieces, with the stack support plate 04 preferably assuming a normal position with, in particular, lifting chains 13 arranged exactly vertically.

The 5 shows an actuatorically displaceable guide claw 16 of the stack support plate 04 in a top view. The guide claw 16 preferably has a rotationally mounted guide roller 18 on the side guide surface of the guide rail 15, ie the guide surface facing the respective side frame wall of the display 01, which rolls on the corresponding guide surface of the guide rail 15 when the stack support plate 04 is vertically displaced. In particular, the or each guide claw 16 is assigned an actuator for the horizontal displacement of the guide claw 16 relative to the stack support plate 04 carrying it.

The guide rail 15 is preferably assigned an actuator such as a pneumatic actuator 19, for example a clamping module, which can be supplied with compressed air. The membranes of clamping modules in particular have a small stroke, e.g. B. a few millimeters, and act like an air cushion or tube. If you fill them with air, they press the guide claw 16, for example against the action of the ball pressure piece, to the opposite side, i.e. H. in the direction of the guide rail 15. By mutually displacing the guide claws 16, for example by alternately actuating the clamping modules, on both sides of the stack support plate 04, the desired offset of the stack support plate 04 in the horizontal direction transverse to the transport direction T of the sheets is achieved with minimal effort.

No additional sensors are required. However, such can be provided if necessary. The adjustment movements can be carried out, for example, with the help of additional 3/2-way valves. The levers for moving the stack support plate 04 can therefore be moved via a 3/2-way valve on each side. If no valve is activated, the stack support plate 04 is preferably held in the neutral center by the resilient ball pressure pieces. This is preferably done during normal operation, with the lateral stacking offset not being active. When the stack offset is activated, the stack offset can be achieved by, for example, ± 2.5 mm by alternately actuating the two valves.

The 6 shows a section of a delivery 01 of a sheet processing machine, for example as described above, with side edge stops 20 arranged on both sides for aligning the falling sheets forming a delivery stack 03. The delivery stack 03 that forms in the delivery 01 is guided in addition to the side edge stops 20, in particular by the front edge stops 07 and rear edge stops 21 on the sheet brake 06, which thus form a storage shaft for the falling sheets. For setting the format of the sheets to be stored The trailing edge stops 21 are preferably adjusted together with the sheet brake 06 in or against the transport direction T and the side edge stops 20 are adjusted transversely to the transport direction T. Drives connected to a common control device, in particular the machine control, are assigned to the side edge stops 20 for displacement.

The 7 shows an enlarged perspective view of one of the two side edge stops 20 with stop surfaces. The side edge stops 20 preferably include an upper section made of guide plates 22, which can also carry out a shaking movement if necessary, and a lower section made of hanging stop elements 23 with stop surfaces, which can also be called wedlers. The upper sections of the side edge stops 20 made of guide plates 22 can be designed in some areas with an angle of inclination to the stack side surface and thereby form a storage shaft that tapers downwards. This area of the side edge stops 20 can be followed by guide plates 22 aligned parallel to the side surface of the stack in the direction of sheet fall and possibly widening areas of guide plates 22 again. The upper sections made of guide plates 22 can also have air passage openings.

The 8th shows a side view of a delivery stack 03 forming during the storage process. The sheets, not shown, which are slowed down by the sheet brake 06, fall downwards in the stacking area or sheet fall area and successively form the delivery stack 03. A stacking surface 25 is formed by the falling sheets, whereby In particular, only a little air escapes between the uppermost sheet forming the stack surface 25 and the sheet immediately preceding it. The display stack 03 is thus formed in particular by finished sheets, whereby the topmost sheets can still lie loosely and the topmost sheet forms the stack surface 25 while the delivery stack 03 is lowered further.

The side edge stops 20 in the delivery 01 are designed in particular in such a way that the stop surfaces of the upper sections, in particular the guide plates 22, are preferably exclusively above the stack surface 25 that is being formed, i.e. H. are arranged above a level in which the sheets form the display stack 03. The guide plates 22 are therefore only effective high up. Furthermore, the side edge stops 20 have stop elements 23 which can be pivoted about a pivot axes 24 which are oriented transversely to the transport direction T and which can be raised by an actuator and thus pivoted upwards. In particular, the pivot axes 24 or pivot points of the displaceable stop elements 23 are arranged above the stack surface 25 that is being formed, but the stop elements 23 are preferably extended so that in the hanging state they reach just as far downwards as previously known ones. The stop elements 23 are preferably designed to hang downwards by gravity about the respective pivot axis 24, so that a respective stop surface of a stop element 23 is located below the stack surface 25 that is formed for aligning the display stack 03. In particular, the fixed display stack 03 is formed at the height of the displaceable or switchable stop elements 23 in the hanging state.

The 9 shows a rear view of a side edge stop 20 with hanging stop elements 23 that can be lifted by actuators, in particular pneumatic cylinders 26. Each stop element 23 of a side edge stop 20 preferably has a stop 28 for an extendable piston 27 of a pneumatic cylinder 26 on the side facing away from the display stack 03. The pneumatic cylinders 26 are controlled by the control device, in particular the machine control, with the piston 27 being extended when they are activated. The extending piston 27 hits the stop 28 of a hanging stop element 23, which is thus pivoted about the respective pivot axis 24 and is thus raised against gravity. This means that the displaceable stop elements 23 can be raised with the help of the pneumatic cylinders 26, i.e. pivoted upwards and thus displaced above the stack surface 25 that has been formed or is being formed.

The stop element(s) 23 of the side edge stop 20 can be displaced by an actuator, in particular the respective pneumatic cylinders 26, preferably completely above the stack surface 25 that is being formed. I.e. at least the stop surface of a stop element 23 is in an upper position completely above the stack surface 25. In particular, in the side edge stop(s) 20 provided, the guide plates 22 and/or the or each pivot axis 24 of a stop element 23 are arranged above the stack surface 25 that is being formed. A guide plate 22 preferably has at least one recess for a respective displaceable stop element 23 above the stack surface 25 that is being formed. The lower edges of the guide plates 22 of the side edge stops 20 are preferably always above the continuously forming stack surface 25 of the display stack 03.

Furthermore, one or more sensor elements can also be provided for monitoring the displacement of the displaceable stop element(s) 23. The at least one stop element 23 of at least one of two opposite stack side surfaces of the display stack 03 assigned side edge stops 20 can be displaced in particular by the control device, in particular the machine control, depending on a horizontal displacement of the display stack 03, in particular as described above. The control device operates the delivery 01 according to the selected operating mode. Preferably, in a selected operating mode, normal operation can be carried out without horizontal displacement of the stack support plate 04, so that a display stack 03 with flat side surfaces results. In another selectable operating mode, for example when the “job separation by lateral offset” option is selected, the stack support plate 04 is shifted horizontally, in particular as described above.

To select the mode of operation, the control device, in particular machine control, can have an input unit, for example a control panel, a control center or a mobile control device or similar. The choice of operating mode can also be transmitted to the control device automatically, for example by a print job that is currently being processed, or it can infer the appropriate operating mode from default values. If, for example, you want to separate individual print jobs by moving the stack support plate 04 laterally (with the delivery stack 03 on it), lateral stops, in particular the respective side edge stop 20, must not represent an obstacle. In particular, the sheets of the previously printed order must not be moved when the delivery stack 03 is moved laterally.

Stacking occurs during operation of the delivery 01 in particular in such a way that the individual sheets fall through the area of the guide plates 22 of the side edge stops 20 in a loose sequence and are laterally aligned by these guide plates 22, which can be supported by a shaking movement of the guide plates 22. In particular, the fixed display stack 03 forms at the height of the stop surfaces of the displaceable or switchable hanging stop elements 23 below the guide plates 22 of the side edge stops 20. This ensures that the display stack 03, in particular its stack surface 25, forms quite deep and certainly not lies more in the area of the possibly shaking guide plates 22, but underneath, i.e. in the area of the movable or switchable stop elements 23. This means that a horizontal stack offset can take place very quickly, since when the display stack 03 is moved laterally, it does not first move downwards (from the area of the side edge stops 20) and must move back up again after moving.

If, depending on the operation of the delivery 01 or the sheet processing machine, a horizontal stacking offset is to take place in a selected operating mode, the at least one stop element 23 of at least the side edge stop 20 lying in the direction of the desired stacking offset is moved over the stack surface 25 that is forming or has already been formed Display stack 03 relocated. As a result, the stack surface 25 of the display stack 03 is located below the at least one raised stop element 23 or the stack surface 25 of the display stack 03 could still form from falling sheets below the at least one raised stop element 23. Preferably, the at least one stop element 23 is raised actuatorically, in particular by the pneumatic cylinder 26, before the display stack 03 is displaced horizontally under the side edge stop 20.

However, it is particularly preferred to always lift all displaceable stop elements 23 of all side edge stops 20 together before moving the stack support plate 04 in order to prevent jamming with the (possibly longitudinally grooved) pallet 05. Therefore, all four preferably single-acting pneumatic cylinders 26 are actuated together, for example by a valve. When the valve is not switched, the stop elements 23 fall down due to their own weight. The program sequence in the selected operating mode with stack offset, for example using the “Job separation by lateral offset” option, can be carried out in such a way that the stack support plate 04 is moved laterally into a starting position at the beginning or before the sheet is deposited (e.g . towards the drive side of the machine). It can also be provided that after the end of a print job or a job to be separated, a sheet gap of, for example, two to three seconds is created. This can be generated by any measures, for example by means of omitted sheets, sheet holders and/or by the non-stop device 08 of the delivery 01.

In the selected mode of operation of the stack offset, the at least one side stop element 23 is switched up, in particular (after the last sheet of the old print order or job has been safely deposited on the delivery stack 03 or this is away from the area of the guide plates 22). Particularly preferred are all displaceable stop elements 23 before a horizontal displacement of the display stack 03 Side edge stops 20 are shifted, in particular actuatorically, preferably by the pneumatic cylinders 26, above the stack surface 25 that is being formed or formed, i.e. the last sheet of the old print order or job. Whether the stop elements 23 have actually moved can be checked using sensors, for example by querying four opener sensors on these stop elements 23. At least it can be recognized that the stop elements 23 are no longer in the hanging position. All four openers must be open before the stack support plate 04 can be moved.

The display stack 03 is then displaced horizontally transversely to the transport direction T under the at least one raised stop element 23 of the side edge stop 20 located in the direction of movement of the display stack 03, in particular by moving the stack support plate 04 in the selected mode of operation of the stack offset. The stack support plate 04 is pushed from one side of the machine to the other side of the machine. However, it is also conceivable to move the stack support plate 04 from one side of the machine to the middle position and then back or to the other side of the machine.

After the stack has been offset, the or all stop elements 23 can be moved back again, or in the simplest case, dropped. In particular, this can be done by deactivating the pneumatic cylinders 26, whereby the stops 28 of the stop elements 23 are released again without contact or released by the retracting pistons 27. Monitoring whether all stop elements 23 are down again is not practical, since here, for example, two of the stop elements 23 are on the stack surface 25, i.e. H. the sheet from the previous job, and thus never reach its lower end position. However, sensory monitoring can be provided if necessary. After placing the displaceable stop element(s) 23 on the stack surface 25 of the previous print job, the first sheet of the subsequent job can arrive.

The 10 shows a perspective view of a side edge stop 20 located above the display stack 03, the at least one raised stop element 23 being placed on the stack surface 25 of the display stack 03 after a horizontal displacement of the display stack 03 transversely to the transport direction T. In particular, when the two stop elements 23 of the side edge stop 20 are lowered, the stop elements 23 on one side will be lowered onto the sheets of the last order and the stop elements 23 will be on the opposite side of the delivery stack 03, for example approximately 5 mm away from the delivery stack 03 . This means that the following sheets of the new job are stored offset from the previous job.

The 11 shows a further perspective view of a side edge stop 20 located above the delivery stack 03 with the two stop elements 23 placed on the stack surface 25 of the previous print order or print job. The delivery stack 03 can here, for example, be moved horizontally by approximately 5 mm below the side edge stop 20, so that the stop elements 23 of the side edge stop 20 are placed on the stack surface 25 of the displaced display stack 03 at a distance of approximately 5 mm from the stack side edge.

Reference symbol list

01

Display

02

Grab truck

03

Display pile

04

Stack support plate

05

palette

06

Bow brake

07

Front edge stop

08

Non-stop facility

09

Non-stop roller blind

10

Electric motor

11

drive sprocket

12

Wave

13

lifting chain

14

Guide pinion

15

Guide rail

16

Guide claw

17

axis

18

leadership role

19

Pneumatic actuator

20

Side edge stop

21

Rear edge stop

22

Guide plate

23

stop element

24

Pivot axis

25

Stack surface

26

Pneumatic cylinder

27

Pistons

28

attack

T

Transport direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102017221434 A1 [0005]
• DE 102019125807 B3 [0006]

Claims (15)

Delivery (01) for a sheet processing machine with a stack carrier (04) which can be moved vertically by a stack lifting drive (13) and with transport systems (02) for transporting sheets in a transport direction (T) to a stacking area and for releasing the sheets in the stacking area above the Stack carrier (04), wherein at least one side edge stop (20) with at least one displaceable stop element (23) is provided for aligning the falling sheets in the stacking area, characterized in that the stop element (23) can be moved above a stack surface (25) that is being formed . Display (01) after Claim 1 , wherein the stop element (23) has a stop surface that can be moved completely above the stack surface (25) that is being formed. Display (01) after Claim 1 or 2 , wherein the at least one side edge stop (20) has at least one stop surface (22) and / or one or more stop elements (23) which can be pivoted about a pivot axis (24) oriented transversely to the transport direction (T) and the at least one stop surface (22) and / or the pivot axis (24) of the stop element or elements (23) is arranged above the stack surface (25) that is being formed. Display (01) after Claim 1 , 2 or 3 , wherein the at least one side edge stop (20) has at least one guide plate (22) with at least one recess for the displaceable stop element (23) above the stack surface (25) that is being formed. Display (01) after Claim 1 , 2 , 3 or 4 , wherein the at least one side edge stop (20) has one or more actuators (26) for displacing one or more displaceable stop elements (23) above the stack surface (25) that is being formed. Display (01) after Claim 1 , 2 , 3 , 4 or 5 , wherein the stop element (23) is designed to hang downwards by gravity about a pivot axis (24), so that a stop surface of the stop element (23) is located below the stack surface (25) that is being formed for aligning the display stack (03). Display (01) after Claim 1 , 2 , 3 , 4 , 5 or 6 , wherein at least one sensor element is provided for monitoring the displacement of the displaceable stop element (23). Display (01) after Claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , wherein the at least one stop element (23) of at least one of two opposite stack side surfaces of the display stack (03) assigned side edge stops (20) can be displaced by a control device depending on a horizontal displacement of the display stack (03). Method for operating a delivery (01) for a sheet processing machine, in particular according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 or 8th , with a stack carrier (04) that can be moved vertically by a stack lifting drive (13) and with transport systems (02) for transporting sheets in a transport direction (T) to a stacking area and for releasing the sheets in the stacking area above the stack carrier (04), whereby at least a side edge stop (20) having a displaceable stop element (23) aligns the falling sheets in the stacking area, characterized in that the stop element (23) is displaced in a selected operating mode over a stack surface (25) that is being formed. Procedure according to Claim 9 , whereby the stacking surface (25) of the display stack (03) is located completely below the raised stop element (23). Procedure according to Claim 9 or 10 , whereby a sheet gap is created before the stack carrier (04) is moved. Procedure according to Claim 9 , 10 or 11 , whereby the display stack (03) is displaced horizontally under the raised stop element (23) of the side edge stop (20) by moving the stack carrier (04) in the selected operating mode. Procedure according to Claim 9 , 10 , 11 or 12 , wherein before a horizontal displacement of the display stack (03), in particular all displaceable stop elements (23) of several side edge stops (20) are actuatorically displaced above the stack surface (25) that has been formed or is being formed. Procedure according to Claim 9 , 10 , 11 , 12 or 13 , wherein the displacement of one or more displaceable stop elements (23) of one or more side edge stops (20) is monitored in particular by sensors. Procedure according to Claim 9 , 10 , 11 , 12 , 13 or 14 , wherein the at least one raised stop element (23) is positioned transversely to the transport direction (T) after a horizontal displacement of the stack carrier (04) carrying the display stack (03). is placed on the stacking surface (25) of the display stack (03).

Images