EP3248918B1 - Sheet transfer into feeding unit - Google Patents

Description

The invention relates to a device for sheet transfer in a placement unit according to the preamble of claim 1.

Docking units for singling and targeted tactual feeding of sheets to a working process are known in the context of sheet-fed rotary printing presses. Sheet conveying takes place via impression cylinders and transfer drums. The printing process operates e.g. after the flexo or offset printing process. Also known are sheet coating machines such as painting machines.

On known sheet-fed printing machines, the application and alignment of the printing material is carried out in facilities for sheetfed, which are fed from a sheet pile scattered sheet as shingled stream via a belt table. The scale flow of the printed sheets can be conveyed by means of suction belts via a suction belt table. A sheet system usually has side marks that can work with pneumatic conveyors, and there are front and top brands provided. Finally, these alignment means are usually provided with a format adjustment. The sheetfed also includes sensory devices for controlling the position of leading edges, side edges, skew or multiple layers of the signatures. By means of sensory devices, attachment locks act to block the printed sheets in the event of position inaccuracy in the sheet transport. Subordinate to the sheet system are oscillating pregrippers, which interact with rotating transfer drums. The substrate undergoes abrupt changes of direction on its conveying path and undergoes considerable delays and accelerations.

Out DE 43 43 616 A1 a landing unit in a modular printing machine system is known, which cooperates with the printing cylinder of a printing unit first double-sized investment drum with peripherally two gripper systems having. This is a second simple-sized investment drum in the sheet conveying direction arranged vertically offset. A third single-size feed drum is the second arranged vertically offset and connected to the sheet transfer with a tilted feed table in. The sheet acceleration system on the high pile feeder is used to process cardboard, while the press is suitable for cardboard and paper. For paper processing, a normal feeder is used, which has to be exchanged completely for a high-pile feeder during carton processing. The application unit is very expensive due to the large number of drums. Due to the many sheet transfers and curvature of the drums, the sheet run is adversely affected. Particularly disadvantageous is the replacement of the aggregates when using a high-pile feeder.

In bowing machines are rotating pre-grippers as in DE-AS 2 063 618 known. This sheet feeder shows a rotating pregripper drum inclined in the conveying direction upstream feed table. The pre-gripper drum has two diametrically arranged gripper systems that can dive into the drum body. In one variant, the sheet feed takes place with a transfer drum connected between the pregripper drum and a printing cylinder. In a second variant, the pre-gripper drum is directly associated with a printing cylinder. Front lays are pivotally integrated in the feed table from below.

From the DE 27 18 314 A1 a rotating pregripper with two gripper systems is known, upstream of a plant table in the conveying direction and a downstream of the same investment drum is arranged downstream. The pre-gripper rotates at half the speed of the feed drum. The gripper systems perform on the pre-gripper a swinging motion about the pre-gripper axis or about a shaft mounted eccentrically to the pre-gripper axis. A partial circumference of the pre-gripper drum protrudes beyond the level of the feed table, which is unfavorable for the bowing.

From the DE 10 2005 012 527 A1 For example, an application unit for a sheet processing machine in a sheet processing machine is known with a method of applying sheets that are suitable for application to a sheet processing plant Creating sheet known, which is designed for attachment to a sheet processing plant. It shows a feed table and arranged at the printing unit side end of the feed table gripper system. The gripper system feeds each sheet directly to a transfer cylinder of the sheet processing plant.

Out DE 199 33 304 A1 a landing unit for a sheet processing machine is known. An investment drum, a feed table and an investor are combined in one module. The axis of the double-sized investment drum of a horizontal plane formed by the axes of all printing cylinders. Gripper systems pivotally mounted on the abutment drum consist of a gripper shaft, grippers arranged on the gripper shaft and gripper loading strips and front marks arranged thereon.

Out DE 10 2007 033 936 A1 is a circumferential pregripper for sheet feeding from a feed table to a transfer drum known. It has at least one non-uniform circulating sheet-holding system and should realize a high productivity-securing sheet feeder by simple means. The at least one encircling sheet-holding system is received in a right-hand guideway and in a left-hand guideway, and the guideways form a self-contained curve.

Out DE 103 55 515 A1 is a rotating pregripper for sheet feeding from a feed table to a transfer drum with a first non-uniform circumferential gripper system and a second non-uniform circumferential gripper system known. The pre-gripper should have a compact design and be realized with little effort, with positioning actions for influencing the gripper operations are possible. The first gripper system is assigned by means of studs of a shaft and it is arranged concentrically to the axis of rotation of a second gripper system supporting hollow shaft. The hollow shaft is provided with radial slots in the track of the stud bolts.

Known partial solutions for clocked sheet fed sheetfed presses are usually outdated and are not rising demands on quality, performance, cost and availability. It is particularly desirable that printed sheets are not subjected to multiple acceleration and deceleration processes and additionally required changes of direction in the transport of substrate. The gripper closure adapted to the transport of each signature and adapted to the working cycle of the sheet-fed printing press for detecting the sheet leading edge should be able to be produced as far as possible in the vicinity of the sheet feeder. The often faulty or known as particularly prone to error scaly sheet transport should, if possible, be omitted.
The effort to supply air to suction belts for fans, a multi-chamber design and a diagonal arc correction via suction belts should be omitted. The orientation of the sheet should be done in the conveying movement during transport from the sheet separation in the sheet feeder serving suction head to a counter-pressure cylinder in the first printing unit of the sheet-fed press. This would considerably more time to align the sheets before the first printing unit of the sheet-fed press available.

The invention has for its object to provide a placement unit for a sheet processing machine of the type described above, the said Avoid disadvantages that allows in particular a simple modular design and allows improved sheet management of the sheet.

According to the invention the object is achieved with the features of claim 1. Advantageous developments emerge from the subclaims.

The invention relates to a placement unit for a sheet-fed rotary printing press with one or more printing units and / or paint modules, which are equipped with a substructure of each double-sized transfer drums and counter-pressure cylinders. The application unit is provided with a sheet feeder, a conveyor unit and a feed table, which may comprise a single- or double-sized feed drum, which is associated with a sheet-guiding drum of a first printing unit of the sheet-fed rotary printing press.
According to the invention, it is provided that the conveyor unit is designed as an endless conveyor system connecting the lower bearing drum to an upper bearing drum, the upper bearing drum being associated with the sheet feeder. The upper feed drum is assigned to the sheet feeder via a feed table associated therewith, and the position and / or the time of pickup are adjustable by the feed system from the feed table to different substrate thicknesses or are self-adjusting.

In an advantageous embodiment, it is provided that the lower investment drum is double-sized and formed from the drum body of a delivery drum and at the bearing of a transfer drum of the first printing unit of the sheet-fed rotary printing machine is arranged and that the upper investment drum is formed with a single-large diameter.

In an advantageous embodiment, it is provided that the conveyor system is designed as conveyor chains exhibiting endless conveyor with gripper systems. The gripper systems have grippers for detecting, holding and transporting printed sheets and leading edge stops for aligning sheet to be detected on and are on the transport and the return path between upper and lower bearing drum guided at least in the region of movement parallel to the feed table with guide rollers in guide rails.

In an advantageous embodiment, it is provided that the feed table is assigned to the sheet feeder in the amount of the upper edge of a sheet pile. A suction head arranged in the sheet feeder above the sheet stack for sheet separation conveys printed sheets separated from the sheet stack directly onto the feed table. The upper abutment drum is associated with the feed table near the edge of the sheet stack and the adjoining region of the conveyor system is substantially parallel to the feed table in the conveying direction.

In an advantageous embodiment, it is provided that the feed table has recesses extending in the conveying direction and designed as feed table engagements. In these feed table interventions dive the open gripper and associated with these leading edge stops of the gripper systems on the conveyor system in the movement in the conveying direction during the sheet takeover. In an advantageous embodiment, it is provided that the area of the conveyor system adjoining the upper contact drum is to a small extent removed in the conveying direction from the extension of the feed table.

In an advantageous embodiment, it is provided that the feed table is slightly removed in the conveying direction following the upper abutment drum from the plane of expansion of the conveyor system.

In an advantageous embodiment it is provided that an inclination between the feed table relative to the adjoining the upper bearing drum in the conveying direction of the conveyor system can be adjusted in accordance with a printing material thickness curve in the conveying direction.

In an advantageous embodiment, it is provided that the feed table two or more sheet position sensors are assigned, which are designed to detect a sheet leading edge of a conveyed over the feed sheet in a specific position or over a range of motion.

In an advantageous embodiment, it is provided that the application unit is associated with a controller, which with the arranged on the feed sheet sheet position sensors via a data line and a first control line with a machine control the sheet-fed rotary printing press is connected. The controller is adapted to perform a determination of position data of the sheet leading edge of a sheet conveyed over the feed table. Furthermore, the controller carries out a determination of specifications for position data of the leading edge of the printed sheet from data of the machine control.

In an advantageous embodiment, it is provided that the controller is connected by means of a second control line with an intrinsic motor drive or an electromechanical suction control of the suction head in the sheet feeder. The controller performs a target-actual comparison of the position data and the predetermined position data. From this, control data for a control of the suction head required on the basis of the desired-actual comparison are obtained.

In an advantageous embodiment it is provided that a device for setting an inclination of the surface of the feed table in the conveying direction in dependence on control data of the machine control is adjustable.

In an advantageous embodiment, it is provided that the conveyor system assigned a device for adjustable gripper control of the gripper on the gripper systems in the sheet transfer to the feed. The controller is coupled to the gripper control so that the grippers close in a particular position or within a range of motion.

Another advantage is that the machine speed can be increased bar, since the plant drum are always rotating in the conveying direction and the time required for conventional swinging systems for the swing back is not needed. In this case, there are no edge changes to the drive systems, which supports the smooth running of the machine. Retroactive moments on the drive wheel train are noticeably reduced and the drive itself is simpler.

Another advantage is based on the improvement of bowing. Due to the inclined or preferably horizontal design of the feed table in conjunction with the feed drum arranged for the feed drum is bent by the relatively large drum diameter of the sheet less than, for example with a single-sized investment drum. The application unit is therefore universally applicable for the processing of relatively thin printed sheets as well as thick sheets, such as cardboard or sheet metal, regardless of the elastic behavior of the sheet.
The arrangement of the upper bearing drum on one or offset in height above a horizontal plane formed by the axes of all counter-pressure cylinder allows for a horizontally arranged feed table at the level of the stack surface, the formation of a Hochstapelanlegers. A complex replacement of a normal stack feeder against a high pile feeder is obsolete.

It is also advantageous that in a horizontally arranged feed the isolated from the sheet feeder sheet are fed directly into a horizontal conveying plane of the upper bearing drum and can be created in the gripper systems of integrated front brands there. This avoids possible damage to the printed sheet, which can occur, for example, at the transition from the sheet feeder to the feed table.

The feed table is preferably formed planar surface and provided with longitudinal openings, in which the open at the inlet to the upper bearing drum gripper fingers of the gripper systems of the conveyor system. With a horizontal arrangement of the conveyor table is advantageous that the conveyed from the sheet stack individualized sheet arrive on a greatly shortened conveying distance to their alignment marks and can be accelerated immediately to full speed. Thus, the length of the feed table can be shortened and, for example, a stopper is less waste.

The structural design of the solution according to the invention has a parallel guide on the contact plate between the gripper systems and pushed by the suction pressure sheet as investment area corresponding to a conventional investment sheet in the sheet feeder.
The printed sheets can be retained in the sheet feeder by means of an attachment lock. As a result, less or no waste accumulates through printed sheets, the stay in the well-known way with stoppers on the belt table and must be cleared which makes them useless.
The orientation of the sheet can be done during transport between the feeder stack and the first printing unit. Axially, ie transversely to the paper direction, the so-called side registration is set by page orientation. The orientation with respect to the slant arc and the position of the leading edge is controlled by the forward movement of the gripper systems.
A sensor with sheet control sensors in the course of the conveyor system is connected to a closed loop and ensures that early, late, double and oblique sheets are already recognized on the investment sheet and are excluded from the acquisition in the sheet transport by means of the conveyor system.
Also possible is a single drive of the sheet feeder, so that then an inline orientation of the early / late bow can be done in machine operation, since the forward movement of the separated sheet can be directly influenced by means of the single drive.
Due to the concept of sheet feeding by means of the gripper system and rail transport in the sheet system, the base of the printing units may be omitted in high-stacking machines.

Sheetfed offset presses are held or made competitive in the future. There is no need to make any difference between the first printing units and the following printing units. As delivery drum or as a lower investment drum, a delivery drum can be used. Card stock bowing will be massively improved by avoiding scratches and other damage.
There is neither a belt table nor belt rollers. The sheetfed system will significantly reduce the number of stoppers in operation and bring a real benefit to the customer, as less waste is created and much easier operation is required by minimal operator intervention.

The pre-gripper from below, which was previously used in the system technology, will disappear in the continuous system. Since a takeover of the substrate is done from the top, an adjustment to the substrate thickness is required. This is currently being solved with great effort by wedge or eccentric settings. According to the invention no complicated adjustments are required. The actuator is a curve similar to that of the boom discharge. This can be set manually or from the control center to the paper thickness.
An important embodiment element are inclined gripper bumps in the conveying direction for the grippers on the gripper system, as used in so-called jib systems, ie gripper systems which are already used in a jib conveyor. An inclined to the movement path of the conveyor system in the field of sheet transfer comb-shaped contact sheet forms another basic element of the inventive solution.
The printed sheets are taken over at different times depending on the sheet thickness. A stepless adjustment to the thickness values of the substrates to be processed can also be done inline during the machine run in the production process.
Overall, there is a significant cost reduction with a large processable bandwidth at the same time. Above all, there are also great advantages in high-quality cardboard by minimizing markings on their often sensitive surfaces.

Fig. 1

ein Bogenanleger mit einer Anlegeeinheit für eine Bogenrotationsdruckmaschine im seitlichen Aufriss,

Fig. 2

ein Schema der Bogenübergabesituation zwischen Greifersystem und Zuführtisch und

Fig. 3

eine Aufsicht auf den Zuführtisch.

The invention will be explained in more detail using an exemplary embodiment. Showing:

Fig. 1

a sheet feeder with a laying unit for a sheet-fed rotary printing machine in a side elevation,

Fig. 2

a schema of the sheet transfer situation between gripper system and feed table and

Fig. 3

a view of the feed table.

A sheet-fed rotary printing machine according to Fig. 1 (Sheet-fed offset printing machine) and has one or more printing units D1, D2 and / or paint modules. Upstream of the first printing unit D 1, opposite to a conveying direction R, is a laying unit 19 provided with an endless circulating conveyor system 11 which cooperates with a counter-pressure cylinder 5 in the first printing unit D1. Each of the first printing unit D1 downstream printing unit D2 or paint module has a transfer drum 4 and one of these in the conveying direction R downstream impression cylinder 5 for the sheet transport. Each counter-pressure cylinder 5 of all printing units D1, D2 is associated with a single-sized blanket cylinder 7 and a single-sized forme cylinder 6.

In each printing unit D1, D2, the counter-pressure cylinders 5 and transfer drums 4 are twice as large, starting from the single-sized blanket 7 and forme cylinder 6 and designed to carry two gripper rows 22 for sheet transport.
The application unit 19 consists of a sheet feeder 1, a feed table 2 and one each based on the single-size form cylinder 6 single or double-sized upper and a lower bearing drum 3.1, 3.2. The upper bearing drum 3.1 and the lower bearing drum 3.2 are connected by two at a distance of the working width of the sheet-fed rotary printing press on both sides arranged endless conveyor chains 23 having conveyor system 11 with each other. The conveyor chains 23 are guided via two sprockets on the upper and lower bearing drum 3.1, 3.2. The conveyor system 11 has in the exemplary embodiment, five on the conveyor chains 23 in guide rails 12 and the sprockets of the upper and lower bearing drum 3.1, 3.2 rotating gripper systems 8. The gripper systems 8 are designed as bar-shaped conveying elements which extend between the conveyor chains 23. Distributed over their length each have a larger number of grippers 9, which are evenly distributed a number of leading edge stops 25 associated with the sheet alignment. The grippers 9 are used to transport the sheet B by detecting and holding at the sheet leading edge 26th
The feed table 2 is arranged directly following an upper edge of a sheet stack 14 held in the sheet feeder 1 in the direction of conveyance R and aligned substantially horizontally. The feed table 2 is the surface of the sheet stack 14 associated upstream of a suction head 13, by means of which the in each case the uppermost signature B is separated from the sheet stack 14 and advanced by means of suction conveyors 13.1 in the direction of the feed table 2 until the sheet leading edge 26 has come into the effective range of acquisition by the gripper 9 to the gripper systems 8.

Above the feed table 2, the upper bearing drum 3.1 is arranged, are guided over the guided on the conveyor chains 23 gripper systems 8 on guide rails 12 in the region of sheet transfer parallel to the feed table 2 via a takeover Ü. An isolated printing sheet B is thus taken up by the gripper systems 8 in the grippers 9 which are open towards the feed table 2 at the inlet. The introduction of the sheet B by the suction conveyor 13.1 of the suction head 13 in the gripper 9 takes place until the sheet leading edge 26 on the leading edge stops 25, so that then the sheet B can be detected at the sheet leading edge 26 and removed. The process of alignment and the sheet transfer takes place at the currently required on the conveyor system 11 fully effective machine speed.

Below the feed table 2, a device with one or more sheet position sensors 20 is arranged. By means of the sheet position sensors 20, the position of the edges (sheet leading edge 26, sheet side edge 27) of a currently separated from the sheet stack 14 and taken over by the gripper system 8 with the grippers 9 sheet B is detected and in terms of its position relative to the machine cycle and the position in terms of alignment evaluated in the acquisition of the separated sheet B from the feeder stack 14 for transport in the conveying direction R on the conveyor system 11.

Below the conveyor system 11, a sheet guiding device 21 is arranged approximately parallel to the sheet transport path. By means of the sheet guiding device 21 each separated sheet B is guided by a gripper system 8 from the upper feed drum 3.1 to the lower feed drum 3.2, where it is transferred to the impression cylinder 5 of the first printing unit D1. In the area of the sheet guiding device 21, further sheet position sensors 20 can be arranged be to further monitor the position of the sheet edges in the gripper system 8 during transport with machine speed.

The position data resulting from the respective measurement of the sheet position by means of the sheet position sensors 20 are used to adapt the sheet position with respect to the processing cycle and the page orientation of each individual sheet B prior to transfer to the sheet-fed rotary printing press.

Accordingly, in one embodiment, a measuring system with sheet position sensors 20, which determines the actual position of a front and / or side edge of the printed sheet B on the feed table 2, is arranged on or below the feed table 2. In a controller hereby a target-actual comparison is made. By means of a side pulling device and / or a leading edge alignment of the sheet B can then be controlled in a target position for adoption by the gripper 9 to the gripper systems 8 aligned.

In a preferred embodiment gem. Fig. 1 the feed table 2 is arranged substantially horizontally so that the printed sheet B singulated by the suction head 13 on the sheet stack 14 in the sheet feeder 1 can be detected or taken over in the area of the feed table 2 in the course of a takeover line Ü. This sheet takeover takes place in a consistently substantially horizontal conveying plane to the gripper systems 8 fed in by the feed drum 3.1 and virtually overhead with grippers 9 opened downwards. Specifically, the sheet transfer takes place at the grippers 9 dipping into areas of the feed table 2 the gripper systems 8 is by means of in Fig. 2 and 3 shown leading edge stops 25 against which the sheets B are applied before the grippers 9 are closed.

The abutment drum 3.1 is arranged above the feed table 2 within the laying unit 19 in such a way that the substantially horizontal conveying plane of the feed table 2 runs tangentially to the corresponding gripper system 8, which enters via the abutment drum 3.1. The upper and lower bearing drum 3.1, 3.2 may, based on the single-size form cylinder 6, be either single or double sized. The constructive selection for this can be made depending on the space requirements and the demands on to be processed printing materials.
The lower bearing drum 3.2 can be arranged with its axis (in alignment) or offset in height (offset in parallel) above a plane which is formed by the aligned axes of all impression cylinders 5 of the printing units D.

At least the lower conditioning drum 3.2 can be designed as a double-sized drum for the simultaneous recording of two gripper systems 8. It then has a favorable for the guidance of stiffer materials for printing larger diameter, so that the sheet to be transported B not so strong bent and thus can be passed more easily to the impression cylinder 5 of the first printing unit D. In this case, as the output assembly for the lower bearing drum 3.1, a jib drum can be used, as it is well known as part of a boom conveyor, a sheet-fed rotary printing machine of the type concerned here.
The upper bearing drum 3.1 does not have this problem because the printed sheets B are always taken there only after expiration of the gripper systems 8 of the plant drum 3.1 in the grippers 9 of the gripper systems 8.

In a further development, the lower abutment drum 3.2 and the sheet guiding device 21 are each a measuring system with at least one sheet position sensor 20 for position detection (actual value) of the printed sheet B guided on gripper systems 8 in the upper bearing drum 3.1, over the sheet guiding device 21 and on the lower bearing drum 3.2 allocated adjacent. The position detection can refer to at least one side edge and the sheet leading edge 26 of the sheet-shaped signature B. The sheet position sensors 20 are circuitry-coupled with an evaluation unit for the target-actual comparison and a control, such that the gripper systems 8 in a training transversely to the conveying direction R is laterally movable.

In a further embodiment, the functional connection of sheet position sensors 20, evaluation unit and control such that a lateral movement of the gripper system 8 realized and / or in an inclined position of the sheet B to the conveying direction R its positional offset recognizable and the sheet B by in or against the conveying direction R obliquely adjustable gripper system 8 can be aligned in the desired position.

The sheet position sensors 20 assigned to the feed table 2 and / or the sheet guiding device 21 and / or the lower feed drum 3.2 are both jointly or individually applicable depending on the accuracy requirements.

The lower conditioning drum 3.2 is in the embodiment according to Fig. 1 arranged directly upstream of the impression cylinder 5 of the first printing unit D1. Each in the conveying direction R downstream printing unit D2 or any other processing unit is then formed by a double-sized transfer drum 4 and a double-sized impression cylinder 5.

The operation of the application unit 19 is as follows:
In the sheet feeder 1, a sheet-shaped printed sheet B is separated by means of the suction head 14 from the top of the sheet stack 13 in the machine cycle and continuously accelerated in the conveying direction R to machine speed. In the forward movement, the sheet is fed to the feed table 2 and in this case preferably already examined with respect to its position and to double sheets or bow damage.
Upon entry of the printing sheet B on the feed table 2, a first orientation of the printed sheet B to a sheet side edge 27 can take place after a preferred metrological detection of an actual value and a nominal-actual comparison in the control.
Immediately thereafter or in motion superimposition, the transport takes place in the conveying direction R against leading edge stops 25 on the gripper system 9 which runs ahead with the grippers 9 open at the bottom. The grippers 9 then grasp the printed sheet B when the sheet leading edge 26 at the leading edge stops 25 is present. The gripper 9 come already to the effect while the sheet leading edge 26 abuts the leading edge stops 25, since they act simultaneously as so-called deck marks and secure the sheet leading edge 26 until the sheet B is fixed in the gripper closure on the gripper system 8. This process with the detection of the position of the sheet leading edge 26 of the sheet B is carried out in a synchronous movement between sheet B and gripper system 8 parallel to each other along the feed table 2 during the transport movement along the takeover Ü.

The expired by the rotating drum 3.1 gripper system 8 is moved further on the conveyor system 11 in guide rails 12 and pulls the fixed in the gripper closure arcuate sheet B from the feed table 2 and transports this, while the plant drum 3.1 is constantly moved at machine speed, in the conveying direction R on the sheet guiding device 21 down. The sheet guide device 21 may be formed as a simple smooth or contoured guide surface over which the sheet B is towed. The sheet guiding device 21 may also be formed as a pneumatically actuated guide surface over which the sheet B is dragged under the influence of compressed air floating or taut under the influence of suction air.

In the area of the sheet guiding device 21, a further or initial metrological detection of the printed sheets B can take place with evaluation of the position and corresponding correction on the conditioning drum 3. Subsequently, the printing sheet B is transferred from the conditioning drum 3.2 in the transfer area to the count of the first printing unit D1 impression cylinder 5. Of the impression cylinder 5 of the first printing unit D1, the sheet B is then transferred after the first printing of the transfer drum 4 of the second printing unit D2 and in a known manner to the subsequent impression cylinder 5. Thereafter, any further processing can take place.

If the conditioning drum 3.2 is designed as a double-sized drum, its drum body from a delivery drum at the end of the sheet-fed offset printing press be taken over. At the printing unit D is already a corresponding storage position for the standard attachment of a transfer drum 4 is provided, in which the delivery drum is used. The jib drum is also intended to accommodate endless chain conveyor systems.

In Fig. 2 the solution according to the invention is shown in detail with a sheet transfer situation between a gripper system 9 and the feed table 2. The gripper system 8 is guided on lateral guide rollers 10 in the guide rails 12 of the conveyor system 11 by the conveyor chains 23. In Fig. 2 is the gripper system 8 is circulated with the upper bearing drum 3.1 and is in motion through the transfer line Ü above the feed table 2 for taking over a sheet B ready. A separated from the suction head 13 sheet B is pushed onto the feed table 2. The sheet B is detected on the gripper system 8 by being clamped by grippers 9, which are moved on a gripper shaft 9.2 on the gripper system 8 of cams against gripper clutches 9.1.
The grippers 9 dive when approaching the feed table 2 in recesses, which are designed as over a range in the conveying direction R of the feed table 2 extending feed engagement 2.1 (see Fig. 3 ).
The gripper tabs 9.1 are guided in a well-defined path and approach during the movement of the surface of the feed table 2, so that there is a fixed distance relation. Since, however, substrates of different thicknesses have to be processed, it is provided that the gripper closure may only take place when the print sheet B rests smoothly on the feed table 2 with its sheet leading edge 26 and is in a predefined relation to the gripper system 8 taking over the print sheet B. Therefore, each gripper system 8 is guided obliquely away from the surface of the feed table 2 in the scope of the different substrate thicknesses to be processed. This is in Fig. 2 represented by a printing material thickness curve P in dash-dotted line. The printing material thickness curve P in this case represents the movement path of the gripper attachments 9.1 relative to the surface of the feed table 2.

For functionally correct takeover of the sheet B to the gripper systems 8, the grippers 9 must then be controlled to close against the Greiferaufschläge 9.1 at the earliest when the detection of the sheet B at the time of the printing material thickness corresponding position on the substrate thickness P can be done. This is basically the case when the sheet leading edge 26 securely abut against all leading edge stops 25 on the gripper system 8 and the gripper clutches 9.1 are in a distance corresponding to the sheet thickness of the feed table 2.
In order to ensure this, a plurality of sheet position sensors 20.1, which are directed from below into the area of the transfer line Ü of the feed table 2.1, can detect the position of the sheet leading edge 26. Advantageously, the sheet position sensors 20.1 monitor a longer region of the feed table 2 in the conveying direction R, which corresponds to all possible takeover positions corresponding to known sheet thicknesses of the substrates to be processed.

1. 1. Der Greiferschluss der Greifer 9 wird über eine variable Greifersteuerung für das Greifersystem 8 dann angesteuert, wenn die Bogenvorderkante 26 in ebener Lage, also mit dem der Bogendicke der Druckbogen B entsprechenden Abstand zu den Greiferaufschlägen 9.1 zum Zuführtisch 2 auch an den Vorderkantenanschlägen 25 anliegt.
2. 2. Der Greiferschluss wird über eine Greifersteuerung für das Greifersystem 8 immer zu einem immer gleichen Zeitpunkt ausgeführt, welcher der maximalen zu verarbeitenden Bogendicke entspricht (siehe strichliierte Linie der Maximalposition 26.1 in Fig. 3). Dies erfolgt so, dass die Bogenvorderkante 26 von dem Saugkopf 13 bis zum Übergabezeitpunkt in ebener Lage an den Vorderkantenanschlägen 25 anliegend gehalten wird.
3. 3. Der Greiferschluss wird über eine Greifersteuerung für das Greifersystem 8 immer zu einem immer gleichen Zeitpunkt ausgeführt, welcher einer mittleren zu verarbeitenden Bogendicke entspricht (siehe strichliierte Linie der Bogenvorderkante 26.2 in Fig. 3). Damit dies sichergestellt werden kann, wird der Zuführtisch 2 in seiner Neigung in Förderrichtung R verstellt (siehe Bewegungspfeil P.1), so dass sich je nach Bedruckstoffdicke eine immer wieder neue Bedruckstoffdickenkurve P ergibt. Die aktuell zu verarbeitende Bedruckstoffdicke wird dabei jeweils in Position der Bogenvorderkante 26.2 übernommen. Die Bogenvorderkante 26 wird vom Saugkopf 13 bis zum Übergabezeitpunkt in ebener Lage an den Vorderkantenanschlägen 25 anliegend gehalten.

The monitoring of the sheet transfer takes place by an adjustment of the previously known from the movement of the gripper system 8 position of the leading edge stops 25 with the measured from the sheet position sensors 20.1 position of the sheet leading edge 26th
For this purpose, the measured data obtained by the sheet position sensors 20.1 are fed via a data line 16 to a controller 15, which is also supplied with data related to the working cycle of the sheet-fed rotary printing machine from the machine control via a first control line 16. Thus, the controller 15, the position of the sheet leading edge 26 of the sheet B on the feed table 2 in relation to the leading edge stops 25 during the takeover movement over the takeover Ü constantly check.
The securing of a correct gripper closure of the grippers 9 on the gripper system 8 can take place in three ways:

1. 1. The gripper closure of the gripper 9 is then controlled via a variable gripper control for the gripper system 8 when the sheet leading edge 26 in a flat position, ie with the arch thickness of the sheet B corresponding distance to the gripper clutches 9.1 to the feed table 2 also abuts the leading edge stops 25.
2. 2. The gripper closure is always performed via a gripper control for the gripper system 8 at an always same time, which corresponds to the maximum sheet thickness to be processed (see dashed line of the maximum position 26.1 in Fig. 3 ). This is done so that the sheet leading edge 26 is held by the suction head 13 to the transfer time in a level position on the leading edge stops 25 fitting.
3. 3. The gripper closure is always carried out by a gripper control for the gripper system 8 at an always same time, which corresponds to a mean to be processed sheet thickness (see dashed line of the sheet leading edge 26.2 in Fig. 3 ). So that this can be ensured, the feed table 2 is adjusted in its inclination in the conveying direction R (see movement arrow P.1), so that, depending on the printing material thickness results in a constantly new substrate thickness curve P. The currently to be processed substrate thickness is taken in each case in position of the sheet leading edge 26.2. The sheet leading edge 26 is held by the suction head 13 to the transfer time in a level position on the leading edge stops 25 fitting.

This ensures that the printing sheet B can always be taken over by the grippers 9 in a flat position on the gripper system 8 with a position corresponding exactly to the desired position of the sheet leading edge position on the conveyor system 11 without additional adjustment measures to be allocated according to their respective substrate thicknesses.

In Fig. 3 the feed table 2 with the feed table 2.1 2.1 is shown in detail, wherein gripper fingers of the gripper 9 and front edge stops 25 are shown positioned in the feed table 2.1. In the feed table 2, a sheet position sensor 20.1 is shown, wherein over the entire width of the feed table 2 at least two sheet position sensors 20.1 (possible are also more than two) are provided. A signature B is shown in abutment with its sheet leading edge 26 at the leading edge stops 25. In dashed lines are layers for a maximum position 26.1 of the sheet leading edge 26 for indicating a maximum processable printing material thickness and a minimum position 26.2 of the sheet leading edge 26 for marking a minimum processable printing material thickness or a middle transfer position with an adjustable feed table 2. The transfer line Ü is also shown by moving from a position near the beginning the feed table interventions 2.1 reaches to the maximum position 26.1.

1. 1. Durch Parallelführung der Elemente Zuführtisch 2 (Anlageblech), Greifersystem 8, Druckbogen B (vom Saugkopf 13), ist der Anlagebereich ähnlich wie ein herkömmliches Anlageblech im Bogenanleger 1 gestaltet.
2. 2. Druckbogen B bleiben bei Anlagesperrung im Bogenanleger. So entsteht wenig Makulatur an frischen Druckbogen B, die von einem Bändertisch bei Neustart entnommen werden müssen.
3. 3. Die Ausrichtung der Druckbogen B zur Bogenvorderkante kann während dem Transport vom Bogenanleger 1 zum ersten Druckwerk D1 erfolgen. Gleichzeitig kann quer zur Förderrichtung 11 der Seitenpasser eingestellt werden.
4. 4. Die Ausrichtung hinsichtlich Schrägbogen und Lage der Vorderkante wird über die Vorwärtsbewegung der Greifersysteme 8 gesteuert.
5. 5. Eine Sensorik mit Regelkreisen erkennt Früh-, Spät-, Doppel- und Schrägbogen schon auf dem Zuführtisch / Anlageblech, so dass die Druckbogen B dort verbleiben können. Während des Transportes zur Druckmaschine sind diese Druckbogen B als Fehlerquelle ausgeschaltet.
6. 6. Bei Verwendung von einem oder mehrerer Einzelantrieben (25, 26, 30, 31) an der Anlegeeinheit 19, ist eine Inline-Ausrichtung der Früh-/Spätbogen während des Transports motorisch möglich.
7. 7. Durch das variable Konzept der Bogenzuführung mittels Greifersystemen 8 und mit Transport auf Förderschienen 12 über eine größere Höhendifferenz in der Bogenanlage können die dazu bisher notwendigen Sockel für jedes der Druckwerke D1, D2 bei Hochstapelmaschinen entfallen.
8. 8. Ein Unterschied zwischen Druckwerk D1 und den Folgedruckwerken D2 ist nicht mehr erforderlich, wenn als untere Anlagetrommel 3.2 (Zuführtrommel) eine Auslegertrommel verwendet wird.
9. 9. Es gibt keinen Bändertisch mit Saugkammern, Luftversorgung, Steuerung, Saugbänder oder Bänderwalzen.
10. 10. Die Verwendung dieser Anlegeeinheit 19 verringert die Störungen im Betrieb der Bogenzuführung zur Bogenrotationsdruckmaschine und bringt Vorteile durch einfachere Bedienung und minimierte Bedieneingriffe, wodurch wiederum weniger Makulatur im Anlagebereich erzeugt wird.

As an advantage of the named invention, the following facts should again be mentioned in summary:

1. 1. By parallel guidance of the elements feed table 2 (abutment plate), gripper system 8, sheet B (from the suction head 13), the investment area is similar to a conventional investment sheet in the sheet feeder 1 designed.
2. 2. Printing sheet B remains in the sheet feeder when the machine is locked. This results in little waste on fresh sheet B, which must be taken from a belt table at restart.
3. 3. The orientation of the sheet B to the sheet leading edge can be done during transport from the sheet feeder 1 to the first printing unit D1. At the same time can be adjusted transversely to the conveying direction 11 of the page register.
4. 4. The orientation with respect to the slant arc and the position of the front edge is controlled by the forward movement of the gripper systems 8.
5. 5. A sensor with control circuits detects early, late, double and oblique sheets already on the feed table / contact plate, so that the printed sheets B can remain there. During transport to the printing press these sheets B are turned off as a source of error.
6. 6. When using one or more individual drives (25, 26, 30, 31) on the application unit 19, an inline alignment of the early / late bow during transport is motorized.
7. 7. Due to the variable concept of sheet feeding by means of gripper systems 8 and with transport on conveyor rails 12 over a larger height difference in the sheet system, the so far necessary socket for each of the printing units D1, D2 can be omitted in high-stacking machines.
8. 8. A difference between printing unit D1 and the subsequent printing units D2 is no longer necessary if a jib drum is used as the lower feed drum 3.2 (feed drum).
9. 9. There is no belt table with suction chambers, air supply, control, suction belts or belt rollers.
10. 10. The use of this application unit 19 reduces the interference in the operation of the sheet feeder to the sheet-fed rotary printing press and brings benefits through easier operation and minimized operator intervention, which in turn generates less waste in the investment area.

LIST OF REFERENCE NUMBERS

1

investor

2

feed

2.1

Zuführtischeingriff

3.1

upper investment drum

3.2

lower investment drum

4

transfer drum

5

Impression cylinder

6

form cylinder

7

Blanket cylinder

8th

gripper system

9

grab

9.1

gripper

9.2

gripper shaft

10

guide rollers

11

conveyor system

12

guide rail

13

suction head

13.1

suction device

14

feeder pile

15

control

16

data line

17

first control line / machine control

18

second control line / suction head

19

investors unit

20

Sheet position sensor

20.1

Sheet position sensor

21

Sheet guiding device

22

Gripper / gripper row

23

conveyor chain

24

arch lock

25

Leading-edge stop

26

Sheet leading edge

26.1

Maximum position arc leading edge

26.2

Minimum position sheet leading edge

D1

printing unit

D2

printing unit

R

conveying direction

A

aligning

Ü

takeover route

P

Bedruckstoffdickenkurve

B

sheet

Claims (13)

1. A feeding unit for a sheet-fed rotary printing press comprising one or a plurality of printing units (D1, D2) and/or coating modules, which is with a substructure of double-size transfer drums (4) and impression cylinders (5) each, wherein the feeding unit (19) is provided with a sheet feeder (1), a conveying unit and a feed table (2), wherein, with regard to a single-size blanket or forme cylinder, the feeding unit (19) has a single- or double-size feed drum (3.2), which is assigned to a sheet-guiding drum of a first printing unit (D1) of the sheet-fed rotary printing press, characterized in
   that the conveying unit is embodied as an endless conveying system (11), which connects a lower feed drum (3.2) to an upper feed drum (3.1), wherein the upper feed drum (3.1) is assigned to the sheet feeder (1) via a feed table (2) assigned to said sheet feeder, and that the position and/or the point in time of the take-over by the conveying system (11) from the feed table (2) can be adjusted to different printing material thicknesses or is embodied to be self-adjusting.
2. The feeding unit according to claim 1, characterized in that the lower feed drum (3.2) is formed to be double-size and of the drum body of a delivery drum, and is arranged at the bearing position of a transfer drum (4) of the first printing unit (D1) of the sheet-fed rotary printing press, and that the upper feed drum (3.1) is embodied comprising a single-size diameter.
3. The feeding unit according to claim 1 or 2, characterized in that the conveying system (11) is embodied as endless conveyor having conveyor chains (23) comprising gripper systems (8), that the gripper systems (8) have grippers (9) for seizing, holding and transporting printed sheets (B) and leading edge stops (25) for aligning printed sheets (B), which are to be seized, and that the gripper systems (8) are guided by means of guide rollers (10) in guide rails (12) at least in the area of the movement parallel to the feed table (2) on the transport path and on the way back between the upper feed drum (3.1) and the lower feed drum (3.2).
4. The feeding unit according to one or a plurality of claims 1 to 3,
   characterized in
   that the feed table (2) is assigned to the sheet feeder (1) at the height of the upper edge of a sheet stack (14) accommodated in the sheet feeder (1), and that a suction head (13) arranged in the sheet feeder (1) above the sheet stack (14) for sheet separation is embodied for feeding the printed sheets separated from the sheet stack (14) directly to the feed table (2), that the upper feed drum (3.1) is assigned to the feed table (2) close to the edge of the sheet stack (14), and that the area of the conveying system (11) following the upper feed drum (3.1) is embodied so as to run essentially parallel to the expansion of the feed table (2) in the conveying direction (R).
5. The feeding unit according to one or a plurality of claims 1 to 4,
   characterized in
   that the feed table (2) has recesses running in the conveying direction (R) and being embodied as feed table engagements (2.1), which are embodied to accommodate open grippers (9) and leading edge stops (25) of the gripper systems (8) of the conveying system (11) assigned to said grippers in response to the movement thereof in the conveying direction (R).
6. The feeding unit according to one or a plurality of claims 1 to 5,
   characterized in
   that the area of the conveying system (11) adjacent to the upper feed drum (3.1) is embodied so as to distance itself slightly from the expansion of the feed table (2) in the conveying direction (R).
7. The feeding unit according to one or a plurality of claims 1 to 5,
   characterized in
   that, relative to the area of the conveying system (11) adjacent to the upper feed drum (3.1), the feed table (2) is embodied so as to distance itself slightly from the plane of the expansion of the conveying system (11) in the conveying direction (R).
8. The feeding unit according to one of a plurality of claims 1 to 7,
   characterized in
   that an incline between the feed table (2) relative to the area of the conveying system (11) adjacent to the upper feed drum (3.1) in the conveying direction (R) is embodied so as to adjustable according to a printing material thickness curve (P) in the conveying direction (R).
9. The feeding unit according to one or a plurality of claims 1 to 8,
   characterized in
   that, assigned to the feed table (2), two or a plurality of sheet position sensors (20.1) are provided, which are embodied for seizing a leading sheet edge (26) of a printed sheet (B) conveyed across the feed table (2) in a certain position or across a movement area.
10. The feeding unit according to one or a plurality of claims 1 to 9,
    characterized in
    that a controller (15) is assigned to the feeding unit (19), which controller is connected via a data line (16) to the sheet position sensors (20.1) arranged on the feed table (2) and via a first control line (17) to a machine controller of the sheet-fed rotary printing press, wherein the controller is embodied to determine position data of a leading sheet edge (26) of a printed sheet (B) conveyed across the feed table (2) and to determine specifications for position data of a sheet leading edge (26) of a printed sheet (B) to be conveyed across the feed table (2), from the data fed from the machine controller.
11. The feeding unit according to one or a plurality of claims 1 to 10,
    characterized in
    that the controller is furthermore connected to a drive comprising its own motor or an electromechanical vacuum air controller of the suction head (13) in the sheet feeder (1) in such a way by means of a second control line (18) that the controller (15) is embodied to form a setpoint-actual comparison from the position data, which had been obtained from the measuring data of the sheet position sensors (20.1) and the control data of the machine controller, and that the controller (15) is embodied to generate control data for a control of the suction head (13), which is required on the basis of the setpoint-actual comparison.
12. The feeding unit according to one or a plurality of claims 1 to 11,
    characterized in
    that a device for adjusting an incline of the surface of the feed table (2) in the conveying direction (R) is assigned to the feed table (2), and that the device for the incline is connected to the controller (15) in such a way that an incline of the feed table (2) can be adjusted as a function of control data of the machine controller.
13. The feeding unit according to one or a plurality of claims 1 to 11,
    characterized in
    that a device for the adjustable gripper control of the grippers (9) on the gripper systems (8) in response to the sheet take-over at the feed table (2) is assigned to the conveying system (11), and that the controller (15) is coupled to the device for the adjustable gripper control for seizing a sheet leading edge (26) of a printed sheet (B) conveyed across the feed table (2) in such a way that the closing of the grippers (9) takes place in a certain position or within a movement area.

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