EP3237211B1 - Security printing machine having at least a printing unit and method for operating a squeegee device - Google Patents

Description

12. The invention relates to a security printing machine with at least one printing unit and a method for operating a doctor device.

The EP 0 723 864 A1 discloses a rotary screen printing machine with a screen cylinder, which forms a printing point with an impression cylinder. On its circumference, the impression cylinder comprises cylinder pits in which gripper devices for sheet transport are accommodated. In order to counteract damage to the screen printing stencils when rolling over the pits, the pressure is relieved when the pit passes through the nip by lifting the squeegee, which is otherwise placed against the screen printing stencil from the inside, into an inoperative position for the duration of the sipping passage. It is switched off by rolling a cam roller on a cam disc against the action of an actuating cylinder that is subjected to constant force. In order to enable the doctor blade to be put back on at an early stage and thus to allow the pressure to be taken up again early after the passage through the pit, a cover that can optionally be placed over the pit can be provided. As a result, the doctor blade can be turned on and thus the build-up of the required inking roller can take place before the channel end is penetrated.

In the EP 1 246 726 B1 A printing press with a printing screen and a squeegee that can be set against it is known, which is mounted so that it can be moved in a purely translatory manner in order to carry out the adjusting movement on a squeegee holder rigidly connected to the machine frame. The drive for starting and stopping can, for example Hydraulic, pneumatic or electromagnetic, but is preferably implemented via a cam.

Through the EP 1 724 113 B1 A bearing device for a circular screen of a screen printing unit is known, the circular screen being mounted on both sides in brackets which are axially movable independently of one another. A center distance to an impression cylinder can be set via eccentric bearings on both sides and an axis inclination can also be varied via an additional eccentric bearing on one of the sides. A circumferential position relative to the counter-pressure cylinder can be varied by means of helically toothing in the drive train which can move axially relative. A squeegee holder that runs inside the screen cylinder and carries a squeegee can be moved pneumatically diametrically to the frame.

In the WO 03/093013 A2 discloses a screen printing machine with a screen cylinder, a cylindrical screen in the assembled state being releasably attached to the ring flanges on the end face.

Through the WO 2008/102303 A2 discloses a screen printing machine with a device for applying directional magnetic field lines to the printing material.

The EP 2 025 515 A1 discloses a security printing machine with at least one printing unit with a printing unit, by means of which an arc-shaped printing material can be printed by at least one printing point formed between a screen cylinder and an impression cylinder using a screen printing method, with one or more drying devices on a printing material path downstream of the printing unit and a further drying device which is provided between the at least one printing point and a downstream point in the printing material path, at which the printing material comes into contact on its side printed by the printing point with a subsequent rotary body. A doctor blade included in the printing unit is correlated to a machine or substrate phase position on and off the screen printing form.

In the EP 2 014 466 A2 discloses a squeegee device of a screen printing unit, which is switched off as a function of a printing material or printing length. The switch-off takes place before the trailing sheet end in order to relieve the strainer from the sheet of a certain thickness before the mechanical load when the strainer rolls off onto the cylinder jacket surface.

The invention has for its object to provide a security printing machine with at least one printing unit and a method for operating a doctor device.

The object is achieved by the features of claims 1 and 12 respectively.

The advantages that can be achieved with the invention consist in particular in that this results in improved print quality and / or less wear during printing and / or reduced maintenance and cleaning effort is achievable. In particular, while maintaining high print quality and / or less wear and / or reduced maintenance and cleaning effort in one advantageous embodiment or mode of operation, a variable format and / or print image length or in another embodiment or mode of operation is printing of print image elements interrupted by sections that are not to be printed on possible.

In one embodiment of a doctor blade device which is particularly preferred in view of the realization of the advantages, it comprises a doctor blade which can be adjusted against it, in particular against the side of the screen printing form opposite the printing point, in particular against a screen printing form of a screen printing cylinder, a bearing device enabling an on-and-off movement between the contact position of the doctor blade and a parking position, and a drive device, by means of which the doctor blade, in particular with its doctor blade edge, is in operation - e.g. B. directly or indirectly - correlated, in particular synchronized to a machine and / or substrate phase position on the screen printing form and from this can be switched off. The drive device is here - in particular with correspondingly set up and capable control and drive means - set up and down the doctor blade in different sequences with respect to the length of the screen printing form, in particular the inner circumference of the screen printing form of a screen printing cylinder, different phase positions and / or lengths to effect. In particular, the drive device is set up to bring the doctor blade on and off with a phase position and / or length that is dependent on the current substrate format and / or print image.

According to the invention, the drive device comprises a drive means that can be controlled by a control device, by means of which the starting and stopping movement can be effected mechanically independently of the machine and / or substrate phase position. The control device is preferably a signal connection with the drive means, the doctor blade depending on the substrate format and / or the information relating to the printed image is provided with varying phase lengths and / or positions of the control device.

A doctor blade device of this type unfolds its advantages, in particular in connection with a security paper, in particular printing material sheets made of security paper, printing machine.

Especially in security printing - for example in the manufacture of securities - only small and significantly spaced apart picture elements are printed in the screen printing process per printing point, which increases the risk of undesired contamination of non-printing points and / or the counterprint surface by color, which in the smallest quantities also not due to printing provided areas of the sieve. By placing the squeegee there, this effect can be reduced or even prevented.

In a preferred procedure, when the squeegee device is operated, a squeegee is placed on and off the screen printing form, in particular on the inside of a screen printing form of a screen cylinder, in a repetitive sequence with one or more phases relating to the setting position and one or more phases relating to the setting position Phases comprising a cycle - in particular with regard to the position and / or length of the cycle - correlates to a machine and / or substrate phase length and / or position. In order to be able to realize one or more of the above-mentioned advantages, the doctor blade is switched on and off according to a sequence dependent on the substrate format and / or printed image. This means, for example, that a sequence dependent on the substrate format and / or printed image is formed and / or selected, after which the switching on and off then takes place during operation.

Starting and stopping the doctor blade - in particular within the cycle - is therefore preferably carried out as a function of the information relating to the printing substrate format and / or the information with varying phase lengths and / or positions.

The aforementioned preferred doctor device and the preferred method further developing features, as set out below and / or using the exemplary embodiments and / or in the features of the subclaims, can be added individually or in groups to form an advantageous further development.

In a particularly advantageous further development o. G. Solution, the position and / or length of the repetitive starting and stopping sequence as a whole can be synchronized to a master axis transmitter. Instead or in addition to this, a cam mechanism driven by the drive means can be provided to implement the on-off movement.

In an advantageous first mode of operation, the squeegee is placed in the position of contact for a longer printing material format, which is longer in the transport direction of the printing material, than for a shorter printing material format. Instead of or alternatively to this, in a second operating mode for a longer print image length as seen in the transport direction of the printing material, the doctor blade is brought into position for a greater phase length than for a smaller print image length. Instead, in addition to this or instead, the doctor blade can be placed in the position of contact for a larger printing strip width, seen in the transport direction of the printing material, for a larger phase length than for a smaller printing strip width.

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

Fig. 1

ein Ausführungsbeispiel für eine ein Druckaggregat umfassende Druckmaschine;

Fig. 2

eine detailliertere vergrößerte Darstellung des Ausführungsbeispiels für ein Druckaggregat aus Fig. 1 in a) bogenverarbeitender und b) in bahnverarbeitender Ausführung;

Fig. 3

eine schematische Querschnittsdarstellung durch ein Gegendruck- und/oder Transportzylindersegment;

Fig. 4

eine schematisch dargestellte Abwicklung eines Mantelflächensegmentes des Gegendruck- und/oder Transportzylinders;

Fig. 5

eine Prinzipskizze für a) die Abfolge von Phasen innerhalb einer An- und Abstellsequenz sowie b) der zugehörigen, den Antrieb betreffenden Betriebszustände;

Fig. 6

eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz für a) ein größeres und b) ein kleineres Bedruckstoffformat;

Fig. 7

eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz in Abhängigkeit von Lage und Länge der vorliegenden Druckbildlänge (L_B);

Fig. 8

eine Prinzipskizze für die Abfolge von Phasen innerhalb einer An- und Abstellsequenz in Abhängigkeit von Lage, Länge und Anzahl der in einer Druckbildlänge (L_B) vorliegenden Druckstreifen;

Fig. 9

eine schematischen Darstellung einer eine Antriebseinrichtung und eine Steuereinrichtung umfassenden Rakeleinrichtung;

Fig. 10

ein erstes Beispiel für die Ausführung der Antriebseinrichtung;

Fig. 11

eine Stirnseitenansicht für ein zweites Beispiel für die Ausführung der Antriebseinrichtung;

Fig. 12

eine perspektivische Schrägansicht zur Ausführung gemäß Fig. 11;

Fig. 13

eine Prinzipskizze für a) die Abfolge von Phasen innerhalb einer An- und Abstellsequenz sowie b) ein Beispiel für ein zugehöriges Bewegungsprofil zwischen einer Masterphasenlage und der die Kurvenscheibe betreffenden Folgeachse;

Fig. 14

eine hinsichtlich der Höhe in der Abweichung gegenüber der Kreislinie überzeichnet dargelegte Prinzipskizze einer eintourigen Kurvenscheibe.

Show it:

Fig. 1

an embodiment of a printing machine comprising a printing unit;

Fig. 2

a detailed enlarged representation of the embodiment of a printing unit Fig. 1 in a) sheet processing and b) in sheet processing execution;

Fig. 3

a schematic cross-sectional view through a counter pressure and / or transport cylinder segment;

Fig. 4

a schematically illustrated settlement of a lateral surface segment of the counter-pressure and / or transport cylinder;

Fig. 5

a schematic diagram for a) the sequence of phases within a starting and stopping sequence and b) the associated operating states relating to the drive;

Fig. 6

a schematic diagram for the sequence of phases within a starting and stopping sequence for a) a larger and b) a smaller substrate format;

Fig. 7

a schematic diagram for the sequence of phases within a switch-on and switch-off sequence depending on the position and length of the present printed image length (L _B );

Fig. 8

a schematic diagram for the sequence of phases within a switch-on and switch-off sequence depending on the position, length and number of print strips present in a printed image length (L _B );

Fig. 9

a schematic representation of a doctor device comprising a drive device and a control device;

Fig. 10

a first example of the execution of the drive device;

Fig. 11

an end view of a second example of the execution of the drive device;

Fig. 12

a perspective oblique view for execution according Fig. 11 ;

Fig. 13

a schematic diagram for a) the sequence of phases within a starting and stopping sequence and b) an example of an associated movement profile between a master phase position and the following axis relating to the cam disc;

Fig. 14

a sketch of the principle of a single-speed cam, which is exaggerated with regard to the height in the deviation from the circular line.

A printing machine, e.g. B. a sheet-fed printing press or a web-fed printing press, comprises on the input side a feed device 01 through which the printing press is supplied with a sheet-like or web-shaped printing material 02, at least one printing unit 03 through which the printing material 02 is printed on one or both sides one or more times, and a product delivery 04, on which printed products or intermediate products are stacked or continuously laid out or wound up as a roll (see e.g. Fig. 1 ).

The printing machine is according to the invention as a printing machine for security printing Printing of sheet-like substrate 02, e.g. B. substrate sheet 02, executed. The feed device 01 for the latter embodiment is z. B. is designed as a sheet feeder 01, in which a stack of the substrate sheet 02 to be fed and printed can be arranged.

According to the invention, the printing unit 03 is the printing substrate 02 in the area of at least one printing point 06; 07 designed for printing on at least one printing material side in a screen printing process, in particular in rotary screen printing. The printing material 02 to be printed in the screen printing process is preferably as printing material sheet 02 and / or as printing material 02 already printed by another printing process and / or as z. B. Textile, linen, hemp and / or synthetic fibers comprehensive security paper and / or as a plastic substrate (polymer substrate) or as a hybrid substrate.

The printing machine is designed as a sheet printing machine for security printing and z. B. designed to print from still unprinted or pre-printed printing material sheets 02, in particular securities sheets, such as. B. sheet with banknotes, as products or intermediate products to be processed.

The substrate sheet 02 are z. B. as layers of a printing material stack in the feeder 01 designed as a sheet feeder 01, from which it is represented by a not shown in detail, for. B. Suction cups gripping device 08 individually recorded and isolated over a conveyor line 09, z. B. via a conveyor system 09, which is preferably designed as a belt system 09, and possibly a feed drum up to an entry area in the printing unit 03 are promoted. At the entrance to the printing unit 03, for example on a transfer drum 11, the printing material sheet 02 is fed to a conveyor line assigned to the printing unit 03, e.g. B. a conveying system assigned to the printing unit 03, through which the printing material sheet 02 has one or more printing points 06; 07 happens before it - for example via a take-up drum 12 - enters a third conveyor line 13 from the conveyor line assigned to the printing unit 03 or to a third conveyor line 13, e.g. B. a belt system 13, passed and through this to the product display 04, z. B. one or more sheet trays for stacking comprehensive product display 04 is transported.

In the sheet-processing printing press according to the invention, the conveyor line assigned to the printing unit 03 is preferably designed as a gripper system in which the printing material sheet 02 is conveyed through the printing unit 03 by successive transfer between a plurality of drums and / or cylinders following one another in the transport direction. At the end of the z. B. designed as a gripper system, the substrate sheet 02 is delivered to the third conveyor line 13.

According to the invention, one or more drying devices 14; 16 provided, e.g. B. a first drying device 14 and a further drying device 16, and for example a device 17 for applying the substrate 02 with directional magnetic field lines.

The printing unit 03 comprises at least one printing point 06 on at least one side of the conveying path, through which the printing substrate 02 can be printed or is printed on one of its printing substrate sides. The pressure point 06 can by a nip point 06 of two rotating bodies 18; 21, e.g. B. a nip 06 between a cylinder 18 of a first printing unit 19 and this cylinder 18 serving as an abutment cylinder 21, z. B. a back pressure and / or transport cylinder 21 may be formed.

Downstream of this at least one printing point 06, a first one in contact with the printing material side printed by the at least one printing point 06, downstream of the printing point 06 in the printing material path, can be in the printing material path of the printing material 02, in particular in the conveying line adjoining the printing point 06 downstream through the printing unit 03 Rotating body 22 may be arranged. This together with the freshly printed substrate side rotating body 16 can, for. B. as a guide and / or transport roller of the conveyor system, as a conditioning roller for cooling or heating the printing material or in particular to form a further printing point 07 as a cylinder 22 of a printing unit 23 following the former printing unit 19.

Such a second pressure point 07 can in this case be formed by a nip point 07 between the cylinder 22 of the second printing unit 23 and a cylinder acting as an abutment. B. is formed by the first printing unit 06 as a counter-pressure and / or transport cylinder 21 cylinder 21 or a different further, effective as a counter-pressure and / or transport cylinder. In the printing material path of the printing press and / or the printing unit 03, one or more further printing units of this type acting on this same printing material side and / or one or more further printing units acting on the other printing material side can be provided upstream or downstream.

hier beispielsweise n = 3, Bedruckstoffbogen 02 in Umfangsrichtung hintereinander ausgebildeten Ausführung des Gegendruck- und/oder Transportzylinders 21 umfasst dieser in Umfangsrichtung hintereinander mehrfach, d. h. n-fach, hier z. B. dreifach, eine derartige Halteeinrichtung 24 und einen jeweils dazwischen liegenden zylindermantelförmigen Umfangsabschnitt (siehe z. B. Fig. 2a). Für den Fall einer bahnverarbeitenden Ausführung der Druckmaschine können derartige Halteeinrichtungen entfallen (siehe z. B. Fig. 2b). Umgangssprachlich umfasst der n-fach große Zylinder 21 n Nutzen, d. h. n jeweils ohne Unterbrechung zum Druck nutzbare Umfangsabschnitte U_D.In the sheet-processing printing press according to the invention, the at least one counter-pressure and / or transport cylinder 14 comprises at least one holding device 24, for. B. a gripper device 24 comprising one or a group of several grippers, through which the leading end of a printing material sheet 02 can be received on the input side and can be released on the output side to the downstream conveyor line. The gripper device 24 is z. B. arranged in an otherwise cylindrical lateral surface 27 of the cylinder 21 provided pit 26, the radially outward opening 28, z. B. pit opening 28, the cylindrical jacket-shaped jacket surface 27 interrupts and disturbs. In one to accommodate several, e.g. B. a number of n $\left(\mathrm{n}\in \mathbb{N}\right).$

here, for example, n = 3, printing material sheet 02 in the circumferential direction of the counterpressure and / or transport cylinder 21 embodied one after the other several times in the circumferential direction, ie n times, here z. B. triple, such a holding device 24 and a cylindrical jacket-shaped circumferential section between them (see, for example. Fig. 2a ). In the case of a web-processing version of the printing press, such holding devices can be omitted (see, for example Fig. 2b ). Colloquially, the n-fold cylinder 21 comprises n benefits, ie n circumferential sections U _D that can be used without interruption for printing.

Irrespective of the type and number n of the holding devices 24 provided in the circumferential direction in the case of sheet printing, the respective pit opening 28 on the circumference of the counter-pressure and / or transport cylinder 21 causes an interruption in the otherwise undisturbed cylindrical surface 27.

In an n-fold, that is to say one-size or multiple-size, the counter-pressure and / or transport cylinder 21, viewed in the circumferential direction, comprises n, ie one or more circumferential sections U _D that can be used as abutments during printing, in particular cylinder circumferential sections U _D and n, ie one or several holding devices 24 Comprehensive circumferential sections U _N , which cannot be used as abutments during printing, with disturbed lateral surface 27. The circumferential sections U _D which can be used as abutments during printing are also colloquially referred to as so-called “saddles”.

The circumferential section U _N which comprises the opening 28 and is not suitable and / or provided for printing has along the continuous circular line a length L _N which is effective when unrolling and which corresponds to the circular arc length extending over the opening. The circumferential section U _{N which can be used} for printing accordingly has a length L _N which at the same time limits the possible length of the printed image.

The circumferential section U _{N, which} cannot be used as a pressure abutment, can in principle be used solely through the opening 28 of the pit 26 receiving the holding device 24 or, if appropriate, through this opening 28 and - if provided - a functional section adjoining on the leading and / or trailing side, for example an overlapping area of a possibly Coloring aid 29 provided on the leading side (see below) and / or a distance from the leading edge of the following pit opening to be maintained by fixing. Conversely, the circumferential section U _D which can be used for printing can in principle be provided by the cylinder jacket section formed between a trailing end of the interruption 28, for example the leading end of the opening 28, and the leading end of the same or next opening 28 following in the circumferential direction. In the event of an irregular formation of the contour delimiting the disturbance on the lateral surface 27 on the leading and / or trailing side, the length L _{N of} the circumferential section U _N that cannot be used for printing is, for example, the arc length considered in the circumferential direction between the leading first and trailing last digits of the interruption 28 in the undisturbed lateral surface 27 caused by the same holding device 24.

According to the invention, this is at least one printing unit 06 and in particular also the at least one further printing unit 07, which works together with the same printing material side, as the printing unit 06; 07, briefly as a screen printing unit 06; 07, and the printing unit 06; 07 assigned cylinders 18; 22 as a forme cylinder 18; 22, in particular as a so-called screen cylinder 18; 22 trained.

The screen cylinder 18; 22 rolls on the outer surface of the counter-pressure and / or transport cylinder 21 and forms in the area of its above. Nip point 06; 07 with the counterpressure and / or transport cylinder 21, the pressure point 06, 07. The screen cylinder 18; 22 comprises in the area of its lateral surface as printing form 31; 32 a screen printing stencil 31 arranged concentrically to the real or imaginary cylinder axis; 32. This is detachably fastened, for example, on the end face on ring flanges, not shown, in the assembled state. The screen printing stencil 31; 32 can in principle be used as an endless cylinder jacket or sleeve-shaped screen printing stencil or as a finite, but in the assembled state for a screen printing stencil 31; 32 be executed.

Inside the forme cylinder 18; 22 is a doctor blade 34 a - z. B. in Fig. 9 schematically shown - doctor device 33 is provided, which in a position "AN" in a peripheral region of the screen cylinder 18; 22 is set against the inside of the screen printing stencil 18, in which the latter forms the printing point 06, 07 with the counterpressure and / or transport cylinder 21. This point can, for example - based on the direction of rotation - up to 5 ° in front of or behind the nip point 06; 07 can be provided with the counter-pressure and / or transport cylinder 21. The doctor blade 34 thus set accumulates a bead of printing ink, which it rolls in front of it and through the permeable locations of the screen printing stencil 31; 32 pushes outwards. In order to pass through the opening 28 on the counter-pressure and / or transport cylinder 21 through the nip point 06; 07 in the subsequent circumferential section U _D To enable a resumption for printing as soon as possible, an above-mentioned inking aid 29, for example, can be used to temporarily and at least partially cover the opening 28. B. a cover 29 designed as a flap 29 may be provided, through which the opening 28 can be temporarily covered at least in the trailing region of the opening 28. This enables the squeegee 34, which is lifted off when the open area of the opening 28 passes through the nip, to be turned on prematurely. The cover element 29 can, for example, overlap slightly with the undisturbed cylinder jacket peripheral section and in this case reduces the length L _D of the maximum usable peripheral section U _D for printing. This geometric shortening is due to the premature hiring z. B. more than balanced. Due to the premature adjustment, a start of the pressure range - in relation to the unwinding during operation - ideally directly, but possibly additionally via a small safety distance, can connect to the cover element 29. An extension of the circumferential section U _N , which cannot be used for printing, beyond the trailing opening edge and / or the distance of the earliest possible start of the printing area to the trailing-side opening edge, for example due to the slight overlap and possibly a slight safety distance in connection to the cover element 29, can be between 10 mm and 50 mm, preferably at most 30 mm.

The maximum length L _{D that} can be used for printing is limited by the earliest possible printing area start due to the machine and / or safety and a latest possible end of the printing area end due to the machine and / or safety. The latest possible end of the pressure range can in principle coincide with the leading end of the following interruption 28, e.g. B. the leading opening edge of the following break 28, coincide or - z. B. for reasons of safety and / or risk of contamination and / or the length of a phase P _ab mentioned below for parking - be spaced a distance to be maintained a _S to the trailing edge of the following pit opening (see, for example, schematically in 3 and 4 ). The maximum length L _D usable for printing can be determined, for example, by the length of the undisturbed circumference on the abutment, e.g. B. the counter-pressure and / or transport cylinder 21, or by other machine elements involved in printing and / or transport, or by the maximum usable length for the printing unit 06; viewed in the transport and / or circumferential direction; 07 provided printing forms 31; 32, hereinafter also referred to briefly as the printing length. These sizes are regularly coordinated and essentially correspond.

In a 1-fold design of the counterpressure and / or transport cylinder 21, the following pit opening is to be understood here as the same single pit opening.

Between the at least one printing point 06 and the downstream point in the printing material path, at which the printing material 02 on its side printed by the printing point 06 comes into contact with the subsequent rotary body 22, a further drying device 36, e.g. B. a dryer 36, in particular intermediate dryer 36 is provided, which is preferably designed as a radiation dryer 36. In order to create an active zone for the dryer 36 which is spatially narrowly delimited along the printing material path, a shading 37 which limits the radiation effect upstream and / or in particular downstream can be provided, which is provided, for example, by a wall 37 of a dryer 36 accommodating the dryer and opening to the side of the printing material Housing is given. In the embodiment designed as a radiation dryer 36, this comprises a one-part or multi-part radiation source 38 for electromagnetic radiation, for. B. for light, especially for UV light, d. H. of light with at least a portion of the emitted radiation power that is predominantly in the UV spectral range. The dryer 36 can in particular be designed as a UV-LED dryer.

The doctor device 33 (see, for example, among others Fig. 9 . Fig. 11 and Fig. 12 ) includes a bearing device 56, 57, 58 of the doctor blade which enables an on-and-off movement 34 and a drive device 39, 41, 48, by means of which the squeegee 34 with its squeegee edge - at least what is the length and / or position of a starting and stopping sequence related to the cycle length L _Z with at least one setting position "ON" and at least one a parking position "AB" concerning phase P _AN ; P _AB , or sequence for short, relates to - correlated cyclically in operation, in particular synchronized or clocked, to the rotational position of the counter-pressure and / or transport cylinder 21 and / or cyclically correlated, in particular clocked, to the position of the printing material 02 to be printed viewed in the transport direction the screen printing stencil 31; 32 of the screen printing cylinder 18; 22 can be switched on and off or is switched on and off. The correlation of the squeegee movement generally relates to a direct or indirect correlation to the machine and / or substrate phase position, that is to say, for example, to the position and / or movement of a machine phase, in particular to a printing point 06; 07 concerned phase position, and / or to a position and / or a progress of the printing material 02 in the printing press. This machine phase can be derived from the indirectly or indirectly derived angular position of one of the pressure points 06; 07 forming cylinder 18; 21; Be 22. The variable relating to the progress of the printing material 02 can be an angular position signal of a machine element transporting the printing material 02 in register or a passage signal of a sensor system provided on the transport path.

The cycle length L _Z is preferably given by the repetition length between two successive print sections, ie the shortest possible distance between the leading ends of two successive print image lengths. Depending on the physical quantity to be considered, this can be spatially related to a path length between two locations y or an angle Φ or temporally to the duration between two times t. Taking into account the geometry and the transport speed profile, these quantities can be converted into one another and relate, for example, to a position relative to the machine phase. The cycle length L _Z corresponds to the sum of the length L44 viewed along the transport route for the maximum usable pressure section U _D and a length L _{N of} a section U _N lying between two such sections U _D that cannot be used for the pressure. In the case of sheet printing, the latter can be caused, inter alia, by the means for sheet transport and for web printing, inter alia by interruptions which are caused by bumps or even gaps between the ends of stretched printing forms. For the presence of a counter-pressure and / or transport cylinder 21, the cycle length L _Z corresponds, for example, overall to the sum of the length L44 of a circumferential section U _{D that can be used} for printing and the length L _{N of} a circumferential section U _{N that} cannot be used for printing and / or that nth part of the circumference of the counterpressure and / or transport cylinder 21 comprising n times the size or n saddle.

Such a cycle length L _Z or the associated on-off sequence comprises e.g. B. at least one phase P _AB with the doctor blade 34 turned off and at least one phase P _AN with the doctor blade 34 turned on. Here, the term phase P _AN ; P _AN again concern a spatial or temporal quantity. Such a cycle can include a sequence with only a single phase P _AB with the doctor blade 34 switched off and a phase P _AN with the doctor blade 34 switched on, or in a further development also a sequence with a plurality of phases P _AN interrupted by a phase P _AB with the doctor blade 34 switched off include employed squeegee 34. As a result of the limited speed of movement when the doctor blade 34 is turned on and off, the phase P _{AN can be carried out} with the doctor blade 34 in the actual working position, in which this doctor blade, for example, not only directly up to, but with a slight deflection of e.g. B. at least 0.5 mm, ie a negative distance a _AN of a _AN ≤ -0.5 mm, determined by the dimension of the actuating movement going beyond the first contact, against the screen printing stencil 31; 32 is employed, and the phase P _AB with an effectively parked doctor blade 34, in which the doctor blade edge is a slight distance a _AB of z. B. a _AB ≥ 0.2 mm, in particular 1.2 mm ≥ a _AB ≥ 0.4 mm, to the screen printing stencil 31; 32, a phase P _at the start or a phase P _from the stop may be located.

Around the blurred area between the actual on and off position "ON";"AB" and / or to keep the area that cannot be used for printing as small as possible, but to enable high operating speeds without too strong impulses caused by the squeegee movement. B. on the circumferential direction in the inner circumference of the screen printing stencil 31; 32 related - length of phase P _{on starting} and / or phase P _{starting from} z. B. between 80 mm and 200 mm, in particular between 110 mm and 150. However, the sum of the length of a phase P _from the parking and the length of a phase P _at the _starting corresponds, for example, at most to the length L _N of the circumferential section which cannot be used for printing U _N , which is given here, for example, at least by the width of the opening 28 seen in the circumferential direction and the distance a _S upstream of the trailing edge of the pit and, if appropriate, by the length of the above-mentioned overlap of a cover element 29 which may be provided.

The doctor device 33 comprises (see e.g. Fig. 9 ) a control device 39, by means of which the doctor blade 34 can be switched on and off in the above-mentioned correlation with the machine phase of the printing press and / or with the progress of the printing substrate 02. In particular, the control device 39 can be used to control a drive means 41 which causes the doctor blade 34 to move in and out in the above-mentioned correlation with the machine phase of the printing press and / or with the progress of the printing substrate 02 in such a way that the doctor blade 34 alternates for one of the length of the phase P _AN with employed squeegee 34 corresponding duration in the "AN" position and - in particular after a transition phase caused by the duration of the phase change - is in the "AB" position for a duration corresponding to the length of the phase P _AB with the squeegee 34 switched off. For this purpose, the drive means 41 is controlled by the control device 39 in such a way that the drive device moves during the phase P _AN with the doctor blade 34 switched on or for the corresponding duration T _AN in an operating state BZ _AN causing the "AN" position and during the phase P _AB with the squeegee 34 off or in the operating state BZ _AB causing the "AB" position for the corresponding duration (see, for example, schematically in Fig. 5 ).

The control device 39 can in this case be formed by a coherent or distributed control circuit 39 or by a coherent or distributed data processing means 39 connected to one another in terms of signal technology, it comprising switching and / or data processing means for carrying out a correlation mentioned above. The control device 39 can be wholly or partly integrated into a machine control system which is connected to other actuating and / or driving means of the printing press, or else entirely or partially provided specifically for the control of the doctor blade 34.

The aforementioned correlation of the sequence relating to a cycle length L _{Z with} respect to the machine phase and / or the progress of the substrate takes place, for. B. by transmission of the machine phase and / or the substrate progress representing signals S _K via a signal connection 35 between the control device 39 and a the machine phase of the printing press and / or the progress of the substrate 02 representing and the doctor blade control z. B. serving as master 42 master axis 42. This can be given, for example, by a machine phase of the printing press and / or the progress of the printing substrate 02 sensing sensor 42 and / or by a drive control 42 controlling the direct or indirect drive of the cylinder 21. In a particularly suitable embodiment for retrofitting, this can be a component which is already provided in the machine and is to be driven in accordance with the register, for. B. the system drum, assigned sensor 42. For machines for which several components or groups of components relating to transport and / or printing are driven in rotation by mechanically independent drive motors via a common electronic master axis, the master axis transmitter 42 serving as squeegee control as master 42 can be formed by such an electronic master axis 42 or ., which serves as a master for several other drive motors of the printing press. This master axis 42 can follow the rotational movement of a real angle signal as a real electronic master axis 42 but generated as a virtual master axis by data processing means and specified for all coupled slave drives. The signal connection 35 is then formed by the coupling to the electronic master axis 42 and is implemented, for example, as a bus or network system.

The doctor device 33 - in particular the mentioned control device 39, which switches the doctor blade 34 on and off in a correlation to the machine phase of the printing press and / or the progress of the printing material 02 - comprises control means 43, by means of which a length and / or position of at least one of the positions " AN "relevant phase P _AN within a repeating cycle for the switching on and off depending on the substrate format and / or information relating to or representing the printed image I (F); I (L _B ); I (M) is variable and / or is varied. In particular, the information I (F) relating to the printing substrate format, in particular its length, and / or the printed image may be concerned; I (L _B ); I (M) for information I (F); I (L _B ); I (M) to the printing material length L02 viewed in the transport direction or to the printing image length L _B relating to the printing material sheet 02 or to the printing unit 06; 07 Print samples to be printed. As a result, the length and position of the phase P _AN can stand both for the length measured in the circumferential direction on the inside of the screen printing form and for its temporal correspondence as the duration or temporal classification connected via the circumferential speed.

In a first variant, two or more discrete values or ranges of values for the relevant information I (F) can be used for controlling the phase length and / or position depending on the format or print image; I (L44); I ( _M ) a corresponding number of discrete phase lengths and / or positions for the phase P _AN with the doctor blade 34 on and / or a corresponding number of - e.g. B. at least partially spaced apart - phase positions for the end of the phase P _AN with the doctor blade 34 - for example in or by the control means 43 - provided or provided.

In an alternative, however, it can be provided that the control means 43 as a function of one of a continuous range of values of the relevant information I (F); I (L _B ); I ( _M ) originating value is a value for the phase length and / or position of the phase P _AN with the doctor blade 34 on or for the phase position of the end of the phase P _AN with the doctor blade 34 from a continuous - and z. B. upward and downward limited - value range is provided or is provided. "Continuously" should also be understood to mean a sequence of equidistant, discrete steps, which is caused, for example, by restriction or rounding to the smallest and / or manageable steps in the size to be considered.

The control device 39 processes signals S _K relating to the above-mentioned correlation to signals S _R controlling the starting and stopping movement of the doctor blade 34, taking into account a specific phase length and / or position for the phase P _AN or relating to the setting position "AN" Phases P _AN within a cycle or a cycle length L _Z. The specific phase length and / or position are obtained and made available by the control means 43 as a function of the printing material format, in particular its length, and / or information I (F) characterizing and / or relating to the printed image; I (L _B ); I (M), summarized here, for example, under the superordinate name of the information I relating to printing (see, for example Fig. 9 ).

The z. B. from the control device 39 for the correlated, in particular synchronized drive control means 43 for providing the format and / or image-dependent phase length and / or location can in turn be formed by one or more connected or distributed circuit and / or data processing means, whereby it Circuit and / or data processing means for determining a phase length and / or the phase position relating to the setting position "AN" depending on the above-mentioned

Information I (F); I (L _B ); I (M) for format and / or printed image.

The control means 43 comprised by the control device 39 can - in accordance with the control device 39 itself - entirely or partially in a control-technically connected, for example, with other actuating and / or driving means of the printing press. B. a planning and / or control level 47 to be attributed machine control integrated or provided locally and close to the drive means 41 to be controlled.

The length and / or position of the at least one phase P _AN with an applied doctor blade 34 or the corresponding or temporal arrangement or a movement profile that takes this length or duration into account is determined on the basis of an assignment rule encompassed by the control means 43 as a function of the information I (F ); I (L _B ); I (M) determined and / or provided. The assignment rule can be provided in tabular form or as a functional connection in a computing and / or storage means 55 included in the control means 43. This should also be understood to mean a complex regulation by which, depending on the information to be used, I (F); I (L _B ); I (M) a movement profile that takes the specific length and / or position into account is determined and / or created.

The information I (F) determining the phase length and / or the phase end or phase position; I (L _B ); I (M) can the control means 43 z. B. be made available via a signal connection 45 from the planning and / or management level 47. This can, for example - in particular in the case of information I (F) relating to or representing the printing substrate format F and / or the printed image; I (L _B ) - are carried out from a control center that is assigned to planning and / or control level 47. The corresponding information I (F) is on this; I (L _B ) itself or about this information I (F); I (L _B ) information to be processed, for example, can be manually selected or entered via an operator interface. In a more automated form, the information I (F); I (L _B ) or I (F) for this information; I (L _B ) information to be processed from already Data for product and / or production planning available electronically in the planning and / or control level 47 or in a prepress stage can be obtained. In one - in particular when using information relating to the print length or the print pattern I (L _B ); I (M) preferable - variant can the relevant information I (L _B ); I (M) can be obtained from data already available in the prepress for the affected print image extract.

The term "phase length" or "phase position" can be used here, if there is no discernible distinction, as a short form for the above-mentioned "length" or "position", both the size or the position of the phase in question in spatial terms (position, Angle) as well as - via the speed profile - their temporal correspondence as duration or relative position within the synchronized cycle length L _Z. The times for the respective phase change and thus the phase length and phase position are z. B. determined relative to the machine phase and / or the substrate phase.

In a first embodiment for designing the control means 43 or for controlling the squeegee movement, for. B. in Fig. 6 schematically indicated on the basis of a side view of a cylinder jacket development comprising a usable circumferential section U _D , for example in a first operating situation printing material sections 02 of a first format F.1, ie with a first printing material layer L02,1, and in a second operating situation printing material sections 02 of a second format F. 2, ie printable with a second substrate L02.1 or are printed. Depending on the respective substrate L02.1; L02.2 or information I (F) representing this length, the phase length of the phase P _AN with the doctor blade 34 or - in this case preferred - an end of the phase P _AN with the doctor blade 34 determined by the control device 39 and / or it occurs depending on the respective substrate L02.1; L02.2 or an item of information I (F) representing this length, an activation and deactivation of the doctor blade 34 in a respective cycle Z1; Z2 (see e.g. Fig. 5 ) in which the different printing material layers L02,1; L02.2 mutually different phase lengths for the respective phase P _AN with the doctor blade 34 or - in this case preferred - mutually different phase positions for the end of the respective phase P _AN with the doctor blade 34 are assigned. The phase position for the beginning of the respective phase P _AN with the doctor blade 34 switched on can be the same and z. B. fixed, but possibly changeable. In the manner set out above, this can, for example, lie before the beginning of the circumferential section U _N that can be used for printing.

In a second, possibly instead of or optionally to the first embodiment feasible or predictable version, z. B. in Fig. 7 schematically indicated on the basis of a side view of a cylinder jacket development comprising a usable peripheral section U _D , the phase length of the phase P _AN with the doctor blade 34 on or at least one end of the phase P _AN with the doctor blade 34 on is controlled by the control device 39 as a function of the respective printed image length L _B or information I (L _B ) representing this length. Under the print image length L _B z. B. in this case be understood the length that is on the supply side through the first and on the return side through the last through the pressure point 06; 07 paint application is limited. The intermediate pressure area 44 can have pressure areas 44 continuously or discontinuously. For operating situations with a different print image length L _B as a function of the respective print image length L _B or information I (L _B ) representing this length, the doctor blade 34 is switched on and off in a respective cycle Z1; Z2, in which the mutually different print image lengths L _B are or are assigned different phase lengths for the respective phase P _AN with the doctor blade 34 on or different phase positions for the end of the respective phase P _AN with the doctor blade 34 on. The phase position for the beginning of the respective phase P _AN with the doctor blade 34 set can be the same and z. B. fixed, but possibly changeable. This can, for example, already in the manner set out above before the start of the circumferential section U _N usable for printing. The phase position for the beginning of the respective phase P _AN with the doctor blade 34 on can be in each case the same as above or a phase position dependent on the start of the printed image.

In a third, possibly instead of or optionally to the first and / or second embodiment feasible or predictable embodiment, for. B. in Fig. 8 schematically indicated on the basis of a side view of a cylinder jacket development comprising a usable circumferential section U _D , several phases P _AN with an applied doctor blade 34 and several phases P _AB with an employed doctor blade 34 can be provided for each cycle length L _Z. In this case, a start and an end of the respective phases P _AN with the doctor blade 34 set are determined by the control device 39 as a function of information I (M) which represent the phase position, viewed in the transport direction, of print strips 46 of a print area 44 which are interrupted by strips not to be printed on. For operating situations with a deviating pattern of strips to be printed and non-printed, the doctor blade 34 in is turned on and off several times depending on the respective distribution of the printing strips 46 or on information I (M) representing this distribution a respective cycle in which the printing areas 44, which differ from one another in the distribution of the printing strips 46, are assigned different patterns for the phase positions and / or lengths, ie the position of the respective beginnings and ends, of the respective phase P _AN with the doctor blade 34 on . become. The information I (M) on the number and / or position of the printing strips 46 is based, for example, on data which are obtained by evaluating the information provided by the printing point 06; 07 print image to be printed, in particular by evaluating the z. B. can be obtained in the prepress in data form existing target print image or are. Stripes to be printed, which are caused by z. B. narrower strips not to be printed are interrupted, despite their discontinuity to be combined into larger print strips 46.

Particularly in connection with the first and the second embodiment, the control means 43 within the preferably fixed cycle length L _{Z is} a ratio between the phase length, related to the length of the inner circumference swept on the screen printing stencil, of the phase P _AN relating to the "AN" position and the storage position Phase _{AB AB} relevant to "AB" can be varied

The bearing and drive device of the doctor blade 34, which enables the on and off movement in the above-mentioned embodiments, can in principle be of any design, provided that it preferably has at least one doctor blade 34 that can be switched on and off and one that is rotated by the rotary drive of the screen printing cylinder 18; 22 and / or the counter-pressure and / or transport cylinder 21 mechanically independently operable and / or operated drive 41, 48. This is, for example - in particular without mechanical coupling to the drive of the screen printing cylinder 18; 22 or the back pressure and / or transport cylinder 21 - either in one hand, the contact position "ON" of the blade 34 causing operating state BZ _AN and in a the removed area "AB" of the blade 34 causing operating state BZ _AB be brought (see, eg. Fig. 5b ) with 5a).

The rotary drive of the screen printing cylinder 18; 22 and / or the counterpressure and / or transport cylinder 21 mechanically independently operated and / or operable and / or without mechanical drive coupling for the rotary drive of the screen printing cylinder 18; 22 and / or the counter-pressure and / or transport cylinder 21 designed drive 41, 48 can in principle be of any design to enable the doctor blade 34 to be turned on and off in the manner mentioned. The type of movement of the doctor blade 34 and / or the design of the drive can in principle be of any type. The following examples reflect particularly advantageous designs, but should not necessarily restrict the functionally underlying solution.

Such a drive 41, 48 comprises at least one controllable drive means 41. This can be used, for example, as a drive means 41 that can be actuated by the application of a pressure fluid (see, for example, in FIG Fig. 10 ), such as B. a pressurized fluid cylinder-piston system, for example a hydraulic or pneumatic cylinder drive, or - as preferred here - as a - preferably angle-adjustable - motor 41 (see e.g. Fig. 11 or Fig. 12 ), such as B. an electric motor 41, for example as a linear motor or preferably as a rotary electric motor 41.

On the output side, the drive means 41 is operatively or indirectly connected to the squeegee 34 to be moved via a corresponding coupling. The operative connection can act directly on the doctor blade 34 without any gear or via a gear 48.

Such a transmission can in a first embodiment, for. B. by a linear movement of a linearly acting drive means 41, for. B. a drive means 41 which can be actuated with a pressure fluid, a transmission 48 which transmits an on / off movement of the squeegee 34, for example comprising a plunger 49 and / or a one- or two-armed lever 51 (see, for example, Fig. 10 ).

In an advantageous embodiment of the drive described here, the coupling can be made via a rotational movement of a rotationally acting drive means 41, e.g. B. an electric motor 41, gear 48 converting into an on / off movement of the squeegee 34 can be realized or realized (see, for example 11 to 13 ).

In the z. B. in 11 to 14 particularly advantageous embodiment described, the gear 48 is formed by a cam gear 48. With the circumferential line that differs from the circular profile (e.g. in Fig. 14 shown exaggerated for the sake of clarity)) of a cam disk 52 rotatable about a rotational axis R52 fixed to the frame acts a stop element 53 received in a coupling member 54, e.g. B. a roller 53 together. This follows the course of the curve and, when the cam disc 52 rotates, transmits the radial stroke caused by the curve shape to the coupling member 54. The coupling member 54 can in principle be designed to transmit the movement in the manner of a tappet to the squeegee 34, but is preferred designed as a non-rotatable lever arm 54 connected to a shaft 56. The shaft 56 is pivotally mounted on the frame about a pivot axis S fixed to the frame. Another lever arm 58, which carries the squeegee 34 via a squeegee carrier 57, is likewise connected to the shaft 56 in a rotationally fixed manner. The lever arms 54; 58 can represent the arms of the same two-armed lever 54, 58 or as lever arms 54; 58 different levers, levers connected to the shaft 56.

To mechanically limit the "AN" position, a stop 61 fixed to the frame and limiting the pivoting movement of the shaft 56 in the direction of the position can be provided. For this purpose, the lever arm 54; 58 or another lever arm 62 connected to the shaft 56 in a rotationally fixed manner. This stop 61 can, if necessary, be adjustable for setting the "AN" position. The lever arm 62 acting together with the stop 61 is here, for. B. Part of a two-armed lever 58, 62 formed by this and the lever arm 58 carrying the doctor arm 57.

Instead of or in addition to the adjustability of the stop 61, the squeegee carrier 57 can be mounted on or in the lever arm 58 for adjustment via a device not shown here in such a way that the latter has at least one movement component in the radial direction of the screen cylinder 18; 22 relatively movable and by a corresponding adjusting device 59 at a distance from the inside of the screen printing form 31; 32 is adjustable.

In order to enable the squeegee 34 to be switched off independently of the operationally controlled actuator 41, 48 for the emergency and / or for maintenance or setup purposes a further drive means 63 different from the first-mentioned drive means 41 can be provided. This can be, for example, as a drive means 63, e.g. B. a hydraulic or pneumatic cylinder, and / or acts, for example, to pivot them with one of the lever arms 54; 58; 62 together.

The cam disc 52 can be driven, for example, axially or, as shown, via a gear 64, in particular a belt drive.

Basically independent of the special design of the controlled drive 41, 48 for the starting and stopping movement, but preferably in connection with the design comprising the cam mechanism, a purely mechanically effective drive 66, 67, 68 is provided in addition to the controlled drive 41, 48 , through which the doctor blade 34 for at least one phase length, which corresponds to the width of the interruption 28 on the lateral surface of the counter-pressure and / or transport cylinder 21, in particular at least the length of the circumferential section U _{N which} cannot be used for printing, from the lateral surface of the screen printing stencil 31; 32 can be lifted off. The mechanics can be designed in such a way that the squeegee movement is determined solely by the controlled drive 41, 48 in the case of a trouble-free operation, and the mechanical drive only takes effect if the control fails.

For example, the mechanically active drive 66, 67, 68 comprises a cam mechanism with a cam 66 connected in a rotationally fixed manner to the counterpressure and / or transport cylinder 21, with the circumferential line of a stop element 68, e.g. B. a role 68 acts together. This follows the course of the curve and, when the cam disk 66 rotates, transmits the radial stroke caused by the curve shape to the coupling member 67. The coupling member 67 can also basically move in the manner of a plunger onto the squeegee 34 or the squeegee holder 57 be designed to be transmitting, but is preferably designed as a non-rotatably connected lever arm 67 connected to a shaft. For In the case of a design of the controlled drive 41, 48 with a pivotable shaft 56 connected to the lever arm 58 carrying the doctor holder 57, the lever arm 67 can also engage this shaft 56.

The curve of the purely mechanically effective drive can be adjusted together with the mechanics that transmit the stroke movement in such a way that the cam segment causing lifting or parking of the doctor blade 34 when the controlled drive 41; 48 just has no influence. For example, the stop element 68 in this curve segment is just in contact with the curve or, at least in the peripheral region U _N that cannot be used for printing, is preferably a slight distance greater than zero, for example by at most 1 mm, in particular at most 0.1 mm , spaced from the curve.

In the described embodiment of the drive 41, 48 controlled by a cam mechanism 48 (see, for example, Fig. 14 ) the cam 52 can in principle be provided with an arbitrarily large radius r52, ie with an arbitrarily large distance from the highest point of the curve line to the axis of rotation. The curve embossed in the circumference can be carried out in one revolution, that is to say only a sequence of a sequence of one or more angular segments ΔΦ _{k, AB} with a higher circumferential section, ie with a larger radius, and one or more angular segments ΔΦ _{k, AN} with a lower one, ie on a smaller radius circumferential section, the higher and lower circumferential sections by transition areas ΔΦ _{k, from} ; ΔΦ _{k, to} representative angle segments ΔΦ _{k, from} ; ΔΦ _{k, on} over z. B. a continuous curve line is connected (see e.g. exaggerated in Fig. 14 ). In another embodiment, in which, for example, a speed is lower and / or transition ranges ΔΦ _{k, ab} ; ΔΦ _k, can be carried out with a smaller curvature, the cam can also be carried out in multiple revolutions, ie in the circumferential direction one after the other several sequences, each with the same pattern in the sequence of higher and lower-lying angle segments ΔΦ _{k, AB} ; ΔΦ _{k, AN} . In the case of a multi-speed version, the cam disk 52 can be operated or operated at a rotational speed which is lower by the factor. Depending on the specific design of the coupling, the angular segment ΔΦ _{k can, AB} having a higher peripheral portion of the removed area "AB" causing operating state BZ _AB and the angular segment ΔΦ _{k, AN} with sunken peripheral portion corresponding to the contact position "ON", causing the operating state BZ _AN or the other way around.

Particularly advantageous for the above-mentioned case of a print format F, 1; F, 2 and / or a control relating to an entire print image length L _B , but not limited to this, the cycle length L _Z for a cycle relating to the squeegee control on the cam plate 52 is assigned only one sequence, which is also referred to below as a single phase, for example only one angle segment ΔΦ _{k, AB} ; ΔΦ _{k, AN} with a parking position "AB" and an angle segment ΔΦ _{k, AN} ; ΔΦ _{k, AB} with a circumferential section effecting the "AN" position, and in each case an angle segment ΔΦ _k, forming a transition; ΔΦ _k, includes. In a multi-speed version, several of these single-phase sequences can be provided on the circumference of the cam 52.

Particularly in the case of a print-strip-related control, but not limited to this, in an alternative, multi-phase execution of the sequence, depending on the cycle sounds L _Z to be run through, several angle segments ΔΦ _{k, AB} ; ΔΦ _{k, AN} with the storage position "AB" and several angle segments ΔΦ _{k, AN} ; ΔΦ _{k, AB can be provided} with circumferential sections causing the "AN" position.

In order to maintain a constant cycle length L _Z -z. B. taking into account transition phases "P _an ";"P _ab " - to be able to vary the division between the phase lengths "AN" and the storage position "AB" and / or their position depending on the format and / or the printed image, is the cam 52 - in principle independent of a single or multi-turn and / or a single or multi-phase execution of its curve - via the drive motor 41 and possibly a drive controller 69 arranged upstream of the drive motor 41 (see e.g. Fig. 9 ) driven or driven by the control device 39 with an angular speed varying in the course of a full revolution of the cam plate 52.

The drive 41; 48 of the cam disc 52 for its rotational movement during operation is loaded with a movement profile - for example for the present format F and / or print image - in which the respective sequence is synchronized with respect to its phase position and phase length to the machine phase of the printing press and / or to the progress of the printing substrate 02 , in particular to the signals S _K from the master connected to the doctor blade control, which represent the position and / or movement of the machine axis and / or the printing material. The sequence and cycle - as far as the absolute angle is concerned - can be shifted overall by a fixed value due to the relative position of the cam to the machine axis. The drive 41; 48 of the cam 52 is thus carried out or is subjected to a movement profile such that the full sequences and cycles - apart from a fixed offset, if necessary - are run through synchronously with one another and with the movement of the machine axis and / or the printing material.

Within the respective sequence, however, the rotary movement of the cam disc 52 does not necessarily follow the movement of the machine axis and / or the printing material or the signal S _K representing this along a linear relationship, but rather follows a movement profile with at least sectionally non-linear relationship between the position of the machine axis and / or of the print substrate or of this layer representing the master signal S _K, and the required and / or occupied angular position Φ _K for the cam disc 52, a short cam angular position Φ _K.

The specific movement profile within the cycle length L _Z for the rotary movement of the cam disc, which deviates from a purely linear relationship, is based on the result of the assignment rule provided in the control means 43 for the information I (F) representing the printing material format and / or printing image concerned; I (L _B ); IN THE). This applies generally to any design of the drive 41, 48. In the present case of a cam mechanism 48, the resulting movement profile comprises phases of lower and / or increased angular velocity within a cycle length L _Z and / or sequence length, the size and / or duration of the lower ones or increased angular velocity of the cam 52, the duration-related length of the operating state BZ _AN relating to the parking position "AN" and / or of the operating state BZ _AB relating to the parking position "AB" is defined within the cycle length L _Z.

That for the information in question I (F); I (L _B ); I (M) through the assignment rule of the control means 43 specific movement profile can by a tabular or parameterized functional relationship - for example between the position of the machine axis and / or the substrate or the master signal S _K representing this position and the required and / or Angular position Φ _{K of} the cam plate 52 - to be assumed. In this case, the movement profile obtained in the aforementioned manner via the assignment rule can, for example, be held in the control means 43, in particular in control means 43 arranged close to the drive. The value pairs of the relationship can, for example, already flow directly into the motor control as incremental support points or z. B. only further apart support points for a z. B. routine provided in the drive controller 69, for. B. an operating mode of a so-called "electronic cam", through which the incrementally required movement profile between the "input axis", here the z. B. the master signal S _K represents the machine axis and / or the Substrate advance, and the "output axis", here for example the cam-side output axis. Any deviation from a single-turn version that may be present on one or both sides is taken into account by appropriate factors.

In generalization of previous teaching, unless there is an obvious contradiction, this can in principle also be applied to a printing unit working according to flat screen printing or to a method working according to flat screen printing. The squeegee can also be turned on and off here depending on the information I (F) relating to the substrate format and / or the printed image; I (L _B ); I (M) take place with varying phase lengths and / or positions, in order, for example, to avoid undesired ink passage in non-printing form sections.

LIST OF REFERENCE NUMBERS

01

Feeder, sheet feeder

02

Substrate, substrate sheet

03

pressure unit

04

product display

05

-

06

Pressure point, nip point

07

Pressure point, nip point

08

gripper

09

Conveyor line, belt system, conveyor system

10

-

11

Transfer drum

12

transfer drum

13

Conveyor line, belt system

14

Conditioning device, drying device

15

-

16

Conditioning device, drying device

17

Conditioning device, device for applying magnetic field lines

18

Rotating body, cylinder, forme cylinder, screen cylinder

19

printing unit

20

-

21

Rotation body, printing unit cylinder, counter pressure and / or transport cylinder

22

Rotating body, cylinder, forme cylinder, screen cylinder

23

printing unit

24

Holding device, gripper device

25

-

26

pit

27

lateral surface

28

opening

29

Coloring aid, cover element, flap

30

-

31

Printing form, screen printing form, screen printing template

32

Printing form, screen printing template

33

doctor device

34

doctor

35

signal connection

36

Dryer, intermediate dryer

37

Shading, wall

38

radiation source

39

control device

40

drive means

41

Master axis encoder, master axis, sensors, drive control

42

control means

43

pressure range

44

signal connection

45

pressure strips

46

Planning and / or management level

47

Gears, cam gears

48

tappet

49

-

50

lever

51

cam

52

Stop element, roller

53

Coupling link, lever arm

54

Computing and / or storage means

55

wave

56

A doctor beam

57

Coupling link, lever arm

58

locking device

59

-

60

attack

61

Coupling link, lever arm

62

drive means

63

transmission

64

-

65

cam

66

Coupling link, lever arm

67

Stop element, roller

68

drive controller

a _AN

distance

a _AB

distance

FROM

removed area

ON

contact position

F.1

format

F.2

format

I

information

L02,1

length

L02,2

length

L _D

length

L _Z

cycle length

P _down

phase

P _an

phase

P _AB

phase

P _AN

phase

r52

radius

R52

axis of rotation

S

swivel axis

S _K

signal

S _R

signal

U _D

Peripheral sections, cylinder peripheral sections (usable for printing)

U _N

Circumferential sections, cylindrical circumferential sections (cannot be used for printing)

Claims (16)

1. A security printing press (03) with at least one printing assembly (03) having a printing unit (06), through which a sheet printing material at at least one printing point (06, 07) formed between a screen cylinder (18) and an impression cylinder (21) can be printed according to a screen printing process, having one or more drying devices (14, 16) on a printing material path downstream from the printing assembly (03) and having a squeegee device comprised by the printing unit (06), comprising

   - screen printing form (31; 32),

   - squeegee (34), which is positioned in an on position ("AN") against the screen printing form (31; 32) or which can be positioned in an on position ("AN") against the screen printing form (31; 32),

   - bearing device (56, 57, 58) facilitating a throwing-on and throwing-off movement between the thrown-on position ("AN") of the squeegee (34) and a thrown-off position ("AB"),

   - and a drive device (39, 41, 48) by means of which the squeegee (34) can be positioned on and off by said drive device in operation correlated to a machine and/or printing-material phase position to the screen printing form (31; 32),
   characterized in that

   - an inking aid (29) is provided, by means of which an opening (28) located on the lateral surface (27) of the impression cylinder (21) of a groove (26) comprising a holding device (24) for printed sheets (02) can be at least partially covered temporarily at least in the trailing region of the opening (28), and which facilitates a premature positioning of the lifted off squeegee (34) in the event of nip entry of the open region of the opening (28),

   - that the drive device (39, 41, 48) comprises a drive means (41) controllable by means of a controller (39), by means of which the throwing-on and throwing-off movement of the squeegee (34) can be brought about mechanically independently from the machine and/or printing-material phase position and/or is brought about, and is equipped to bring about and/or facilitate a throwing on and throwing off of the squeegee (34) in sequences differing from one another with different phase positions and/or phase lengths with respect to the length of the screen printing form (31; 32).
2. The security printing press according to Claim 1, characterized in that a further drying device (36)is provided in between the at least one printing point (06) and a downstream point in the printing material path, at which the printing material (02) comes into contact with a subsequent body of rotation (22) on its side printed by the printing point (06).
3. The security printing press according to Claim 1 or 2, characterized in that the drive device (39, 41, 48) can, by means of the drive means (41), without rigid coupling to a machine element representing the machine and/or printing-material phase position, be brought into an operating state(BZ_AN) bringing about the thrown-on position ("AN") and into a operating state (BZ_AN) bringing about the thrown-off position ("AB").
4. The security printing press according to Claim 1, 2 or 3, characterized in that a controller (39) in signal connection with the drive means (41), switching the squeegee on and off depending on the printing material format and/or information I(F); I(L_B); I(M) relating to the printed image with varying phase positions and/or lengths is provided as controller (39).
5. The security printing press according to Claim 1, 2, 3 or 4, characterized in that by means of control means (43) comprised by the controller (39) a length and/or position and/or number of one of the phases (P_AN) relating to the thrown-on position "AN" within a repeating sequence fixed with respect to its length is variable in dependency on information I(F); I(L_B); I(M) relating to the printed material format and/or the printed image.
6. The security printing press according to Claim 1, 2, 3, 4 or 5, characterized in that the drive means (41) and/or a controller (39) controlling the drive means (41) is in signal connection with a master axis encoder (42) representing the machine and/or printing-material phase position and serving the purpose of controlling the drive means (41) with respect to a length and/or position of a thrown-on and thrown-off sequence serving as master, in particular configured as an electronic master axis (42).
7. The security printing press according to Claim 1, 2, 3, 4, or 5, characterized in that the drive device (39, 41, 48) comprises a cam mechanism (48) driven by the drive means (41), via which the throwing-on and throwing-off of the squeegee (34) occurs, and that the controller (39) controlling the drive means (41) is configured to be driving with an angular velocity that is variable and/or varying in the course of a full revolution of the cam disk (52).
8. The security printing press according to Claim 1, 2, 3, 4, 5 or 6, characterized in that the drive device (39, 41, 48) comprises a linear acting drive means (41), in particular a cylinder-piston system to which pressure medium can be supplied or an electrically driven linear drive.
9. The security printing press according to Claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the drive means (41) is designed as a preferably angular position adjustable electric motor (41) or at least comprises a preferably angular position adjustable electric motor (41).
10. The security printing press according to Claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that the drive device (39, 41, 48) bringing about the throwing on and throwing off of the squeegee (34) engages on the output side on a squeegee carrier (57) bearing the squeegee (34), extending within the screen printing form (31; 32) and preferably extending over at least the length of the squeegee (34) viewed in the axial direction.
11. The security printing press according to one or more of Claims 1 to 10, characterized in that the inking aid (29) is configured as a flap (29).
12. A method for operating a squeegee device in a security printing press printing a sheet (02) printing material according to a screen printing process at at least one printing point (06, 07) of a printing unit (06) comprising a printing assembly (03) which comprises one or more drying devices (14, 16) on a printing material path downstream from the printing assembly (03), wherein a throwing on and throwing off of a squeegee (34) occurs on a screen printing form (31; 32) in a repeating cycle comprising a sequence with one or more phases (P_AN) relating to a thrown-on position ("AN") and one or more phases (P_AN) relating to a thrown-off position ("AB"), and wherein the length and/or the position of the cycle is correlated to a machine and/or printing-material phase (P_AB) length and/or position, characterized in that the throwing on and throwing off of the squeegee (34) occurs according to a sequence dependent on the current printing material format and/or printed image by means of a drive means (41) controllable by a controller, by means of which the throwing on and throwing off of the squeegee (34) can be brought about mechanically independently from the machine and/or printing-material phase position, and that within the sequence correlated to the machine and/or printing-material phase length and/or position a premature positioning of the squeegee (34) occurs such that the squeegee (34) is located in its thrown-on position (AN) for the formation of an ink bead, before the leading end of the printed sheet (02) enters into the nip point (06, 07) formed between the screen printing form (31; 32) and abutment.
13. The method according to Claim 12, characterized in that a throwing on and throwing off of the squeegee (34) occurs within the cycle in dependency on information I(F); I(LB); I(M) relating to the printed material format and/or the printed image with varying phase lengths and/or positions and/or that the phase positions and/or lengths of the sequence vary in dependency on information I(F); I(LB); I(M) relating to the printed material format and/or the printed image, and/or that a length and/or position and/or number of one of the phases (P_AN) relating to the thrown-on position "AN" within a repeating sequence, which is in fixed correlation to the machine and/or printing-material phase position, is varied in dependency on information I(F); I(LB); I(M) relating to the printed material format and/or the printed image.
14. The method according to Claim 12 or 13, characterized in that the squeegee (34) is brought into the thrown-on position ("AN") for a longer printed material format (F.1) seen in the transport direction of the printed material (02) for a greater phase length than for a shorter printed material format (F.2) and/or brought into the thrown-on position ("AN") for a greater printed image length (L44) seen in the transport direction of the printed material (02) than for a shorter printed image length (L44) and/or brought into the thrown-on position ("AN") for a greater phase length for a greater pressure strip width seen in the transportation direction of the printed material (02) than for a smaller pressure strip width.
15. The method according to Claim 12, 13 or 14, characterized in that for the case of several pressure strips (46) to be spaced consecutively in a same overall print image length (L_B) in the transportation direction in pairs to be interrupted by a strip not to be printed the squeegee (34) is thrown off and on again several times with respect to a phase length corresponding to the print image length (L_B).
16. The method according to Claim 12, 13, 14 or 15, characterized in that the throwing on and throwing off of the squeegee (44) is brought about by means of an electric motor (41), in particular an angular position adjustable electric motor (41).

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