EP3426492B1 - Method for checking the maintenance of register of printed images to be printed on two opposite sides of a printing material - Google Patents

Description

The invention relates to a method for checking a registration of printed images to be printed on two opposite sides of a printing material according to the preamble of claim 1.

To ensure the quality of printed products produced by a rotary printing press, it is necessary to check the register accuracy of printed images of a printing material printed on both sides of the rotary printing machine, ie on two opposite sides. This test, especially in the production of expensive, z. B. in value printing or high-quality packaging print to be produced printed products is necessary, at least when setting up the rotary printing machine, ie before the rotary printing machine in production, ie in their production, which are set up during setup in the production process components of the rotary printing press in their interaction, Waste paper is avoided as much as possible due to lack of registration. The term register is understood here to be a matching of printed on the front and back of the substrate printed images. This means that print images printed on the two opposite sides of the printing material must preferably be in a predefined relationship with regard to their relative position to one another, taking into account previously defined tolerances, this ratio remaining as unchanged as possible in the continuous printing of the rotary printing press, since a deviation from one for This ratio predetermined setpoint, in particular a beyond the predetermined tolerances exceeding deviation as a quality-reducing effect. The relation which relates to the relative position of printed images printed on both sides of the printing substrate consists, for example, of B. in that these printed images as congruent or complement each other to a single geometric figure or z. B. separated in their respective position from each other in a z. B. are arranged by the setpoint predetermined fixed distance from each other. The printed images can z. B. be designed as any geometric figures or picture elements or ornaments or as characters or as symbols or as a pagina or as a complete type mirror. The printed image may be a security feature z. B. a banknote or other value document. This security feature is z. B. such that on the front and back at one point of the bill or the document of value z. B. Teilornamente, which considered against a light source, ie in a review, to complete a complete ornament. Such security features are preferably produced in a so-called simultaneous printing process. The printing material is preferably designed as at least one printed sheet and consists for. B. of paper, cardboard or cardboard.

By the DE 10 2012 214 585 A1 a method is known for arranging at least one printing plate on at least one plate cylinder of a printing press, wherein depending on at least one register pattern of a printing material new settings for at least one temperature of at least one arranged on the at least one plate cylinder pressure plate and / or at least one cylinder bale of the at least one plate cylinder and / or at least one temperature control means cooperating with this pressure plate and / or this at least one plate cylinder and the at least one temperature of at least one pressure plate and / or this at least one cylinder bale and / or this at least one temperature control is changed according to the new settings.

• Bearbeiten der Materialbahn an einer ersten Stelle;
• Unabhängiges Bearbeiten der Materialbahn an einer zweiten Stelle, wobei die Bearbeitung an den beiden Stellen jeweils eine sich in einem festen Abstand periodisch wiederholende identifizierbare Struktur hinterlässt;

• Anordnen von Bildaufnahmeorten an Positionen, die einen vorgegebenen festen geometrischen Abstand aufweisen;
• Aufnehmen einer Anzahl von Impulsen pro sich periodisch wiederholender Struktur;
• Aufnehmen von dem Bahnweg der Materialbahn proportionalen Signalen am Bildaufnahmeort;
• Errechnen der wahren Strukturlänge aus den dem Bahnweg proportionalen Signalen und den Impulssignalen pro periodischer Struktur;
• Errechnen der Zeitpunkte für die Bildaufnahme aus der wahren Strukturlänge und den Impulssignalen pro periodischer Struktur;
• Aufnehmen und Speichern eines ersten Bildes der ersten Stelle am ersten Bildaufnahmeort zu einem ersten Zeitpunkt;
• Aufnehmen und Speichern eines zweiten Bildes der zweiten Stelle am zweiten Bildaufnahmeort zu einem zweiten späteren Zeitpunkt; und
• gleichzeitiges Anzeigen des ersten und zweiten Bildes.

By the EP 2 269 824 A1 a method is known for monitoring the proper machining of a material web in installations with the following method steps:

• Processing the web at a first location;
• Independently processing the web at a second location, wherein the Processing leaves at the two locations in each case a periodically repeating at a fixed distance identifiable structure;

• Arranging image pickup locations at positions having a predetermined fixed geometric distance;
• Picking up a number of pulses per periodically repeating structure;
• Picking up signals proportional to the web path of the web at the image pickup location;
• Calculating the true structure length from the signals proportional to the web path and the pulse signals per periodic structure;
• Calculating the times for the image acquisition from the true structure length and the pulse signals per periodic structure;
• Taking and storing a first image of the first location at the first image capture location at a first time;
• Taking and storing a second image of the second location at the second image capture location at a second later time; and
• simultaneous display of the first and second image.

By the DE 10 2009 012 436 A1 A method is known for checking the color separations printed on a carrier material, in which a first color separation of a first color is produced on the carrier material, wherein the first color separation comprises at least a first part of an image of binary symbols with coded data, at least a second color separation of one second color on the support material is generated, wherein the second color separation comprises a second part of the image of the binary symbols with coded data, in which detected by means of a sensor arrangement, the image and the data are determined.

By the JP S60 85961 A a method for determining color register errors in offset printing is known, in which determined by means of a camera distances between predetermined applied on a sheet marks and with the distances be compared between corresponding markers in a template.

By the DE 102 60 124 A1 For example, a see-through security element for value documents is known, which has superimposed patterns on two opposite sides of a translucent carrier material, the two patterns complementing each other in register-accurate arrangement to form a complete image.

By the DE 10 2007 053 594 A1 a device for determining the turning passport in a double-sided printed sheet is known in which a first registration element on a recto printing side and a second registration element on a reverse side of the sheet illuminated and the illuminated Passerelemente are comparable with respect to their position to each other, with a recording for introducing a the Passerelemente bearing pressure sheet having beam deflection, which reflects the reflected by the illuminated passer elements images one above the other or side by side, so that the position of the passer elements is evaluated by an observation device.

By the DE 199 45 979 C1 a device for measuring marks on a printed product top side and a printed product underside with respect to each other and to a printed product edge is known, consisting of two transducers, each associated with a printing material side, at least one reference mark carrier and a clamping device, wherein the clamping device consists of two clamping elements, wherein the clamping elements about a common bearing axis of a bearing are rotatably mounted to each other, wherein the clamping elements in the bearing axis extending each have a longitudinal gap opening, the folded form a nip, wherein the printed product insertable into this nip and fixable by rotation of the clamping elements and the measuring marks including the printed product edge lie in the region of the longitudinal gap opening.

By the DE 298 07 663 U1 a device for determining the reversing pass in printed on the perfecting and the reverse side printed sheet is known, one of the beautiful and one of the reverse side of the sheet associated measuring device is provided for detecting the position of points on the recto and opposite side of the sheet, said the sheet between the two measuring devices can be inserted and fixed in a position provided for the measurement position.

By the DE 298 19 735 U1 is a device for determining a turning passport in a double-sided sheet known, in which a first registration element on the Schön- and a second registration element on the reverse side of the sheet are illuminated and the illuminated Passerelemente are comparable with respect to their position to each other, one a sheet recording for Introduction of a Passerelemente bearing arc section having Strahlumlenkeinrichtung reflected from the illuminated Passerelementen images above or next to each other reflects that the position of the register element of the recto printing side and the position of the register element of the back pressure side are evaluated by an observation device.

By the JP H05 254 105 A a register mark inspecting device is known which inspects a positional relationship between register marks on a front side and a back side of a printed product, the register mark inspecting device having two lenses each of which generates an image of the register marks on the front side and the back side of the printed product and which are arranged opposite to each other.

• Aufdrucken von Registermarken auf die Bogenvorder- und die -rückseite während des Vorder- und Rückseitendruckes in einer Bogendruckmaschine,
• Auflegen des Bogens auf den Messtisch und Anlegen des Bogens an horizontalen und vertikalen Bogenanschlägen, die derselben Bogenecke zugeordnet sind,
• Ermittlung des horizontalen und vertikalen Abstandes der dieser Bogenecke zugeordneten Registermarke auf der Bogenvorderseite von den nächstliegenden Seitenkanten des Bogens mittels eines Positioniersystems des Messkopfes,
• Wendung des Bedruckstoffbogens und Anlegen derselben Bogenecke an den in Wenderichtung gegenüber liegenden Anschlägen,
• Ermittlung des horizontalen und vertikalen Abstandes der Registermarke, die auf der Bogenrückseite derselben Bogenecke zugeordnet ist, von den nächstliegenden Seitenkanten des Bogens mittels des Positioniersystem des Messkopfes,
• Berechnung der Lagedifferenzen zwischen den Registermarken auf der Bogenvorder- und -rückseite,
• Lagekorrektur der Druckzylinder auf der Basis der ermittelten Lagedifferenzen zur Herstellung der Deckungsgleichheit der Registermarken.

By the DE 103 22 547 A1 is a method for determining and correcting register deviations in both sides printed in sheetfed presses with a measuring table and a two-dimensional parallel to the measuring cell movable measuring head measuring device for sheet control known, the measuring table vertical and horizontal sheet stops outside the maximum sheet format and has the positioning of the movable measuring head can detect the position of measuring points on the sheet with an accuracy of 1/100 mm, with the following steps:

• Printing register marks on the sheet front and the back during the front and back printing in a sheet-fed press,
• Placing the sheet on the measuring table and applying the sheet to horizontal and vertical sheet stops associated with the same corner of the sheet
• Determination of the horizontal and vertical spacing of the register mark associated with this corner of the sheet on the sheet front side from the nearest side edges of the sheet by means of a positioning system of the measuring head,
• Turning the printing material sheet and applying the same corner of the sheet to the opposite direction in the reversing direction,
• Determining the horizontal and vertical distance of the register mark, which is assigned to the sheet back side of the same corner of the sheet, from the nearest side edges of the sheet by means of the positioning of the measuring head,
• Calculation of the differences between the register marks on the front of the sheet and back,
• Position correction of the printing cylinder on the basis of the determined position differences for establishing the registration of the register marks.

By the EP 2 447 071 A1 For example, a side register correcting apparatus is known which has a register correcting unit capable of correcting register movement of a fiber web through each plural printing units and a fan correcting unit capable of correcting a width of the fiber web stretched in a width direction, the side register correcting device comprising: a) a register detecting and estimating unit capable of estimating and detecting a register correction amount by the register correcting unit based on at least two register marks printed on the fiber web through each of the printing units when plural printing units are in one traveling fiber web to print a correction by the register correction unit and the fan correction unit; b) a register correction control unit capable of automatically controlling the register correction unit in real time based on the register correction amount derived by the register detecting and estimating unit; c) a fan detection and estimation unit capable of estimating and detecting a fan correction amount by the fan correction unit based on a register flag; and d) a fan correction control unit capable of automatically controlling the fan correction unit in real time based on the fan correction amount derived by the fan detection and estimation unit, wherein the register marks are printed on a front side and a back side of the fiber web.

By the US 5 036 763 A is a convertible multicolor printing machine for perfecting, in particular of banknotes, known with two substantially identically constructed halves, each a first cylinder, one against this pressed image transfer cylinder, a second cylinder designed as a rubber cylinder, which is adjustable between a compressed against the first cylinder offset printing position and a spaced from this collective pressure position, several standing in contact with this blanket cylinder convertible, formed in the offset printing position as offset plate cylinder and in the collective pressure position as a color selection cylinder , each of an inking unit einstärbbare cylinder, a rubber cylinder associated with the adjustable collective plate cylinder, which is zurückrückbar in the offset printing position from the blanket cylinder in an inoperative position and cooperates in the collective pressure position with both the blanket cylinder and the image transfer cylinder, and in at least one of the machine halves an additional printing unit having a plate cylinder colored by its own inking unit, the two first cylinders being adjacent to each machine half adjacent printing cylinder act, the pressure cylinder and the image transfer cylinder each machine half form a first nip between them, that form in the offset printing position, the pressed against each other printing and blanket cylinders between them a second nip, wherein the paper to be printed first, the one printing cylinder in one sense partially wraps around and after passing through the gap between the two cylinders partially wraps around the other pressure cylinder in the other sense, the printing gaps in both halves of the machine under pressure initially one, then the other paper side are passed, and wherein the plate cylinder of the additional printing unit inking the image transfer cylinder.

The invention has for its object to provide a method for checking a register of printing on two opposite sides of a printing material to be printed images.

The object is achieved by the features of claim 1. The dependent claims relate to advantageous developments and / or embodiments the solution found.

The achievable with the present invention consist in that an examination of the register accuracy of printed on two opposite sides of a printing material images is made possible without the aid of a print image foreign reference. Printed images intended for opposite sides of the printing substrate are checked directly and directly by viewing the same side of the printing substrate or by simultaneously recording these printed images in the same photographic image. Therefore, the proposed method is also suitable for substrates with low transparency.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below, with further advantages in connection with the embodiment can be seen.

Fig. 1

ein Druckwerk einer Rotationsdruckmaschine ohne Bedruckstoff;

Fig. 2

das Druckwerk der Fig. 1 mit einem Bedruckstoff;

Fig. 3

eine die Erfindung verwendende Rotationsdruckmaschine.

Show it:

Fig. 1

a printing unit of a rotary printing press without printing material;

Fig. 2

the printing of the Fig. 1 with a printing material;

Fig. 3

a rotary printing press using the invention.

Fig. 1 and Fig. 2 show by way of example in each case schematically and greatly simplified a printing unit 01 a z. B. used in value printing or packaging printing rotary printing machine, z. B. a printing in an offset printing process rotary printing machine, wherein the printing unit 01 two cooperating in the printing process, ie against each other employed printing cylinder 02; 03 has. The preferably not assigned by one of the rotary printing press shown control station from remotely operated or at least remotely operable printing unit 01 has for each of the two cooperating printing cylinder 02; 03 in each case at least one inking unit (in the Fig. 1 and 2 not shown) and optionally in each case at least one dampening unit (in the Fig. 1 and 2 not shown). If the rotary printing machine is designed as an offset rotary printing press, each of the two cooperating printing cylinder 02; 03, which are then each formed as a transfer cylinder or as a blanket cylinder, in each case at least one forme cylinder (in the Fig. 1 and 2 not shown) assigned. For each of the two cooperating printing cylinder 02; 03 is preferably also a washing device 04; 06 provided, with which each of the printing cylinder 02; 03 each of ink can be cleaned. Each printing cylinder 02; 03 can transfer at least one print image to a substrate 07 ( Fig. 2 ), wherein in the circumferential direction of each printing cylinder 02; 03 each preferably several print images can be arranged one behind the other. Likewise, in the axial direction of each printing cylinder 02; 03 each have multiple print images next to each other. The respective print images can be monochrome or multicolored. The respective direction of rotation of each printing cylinder 02; 03 is indicated in the figures in each case by a directional arrow. Likewise, a transport direction T provided for the transport of the printing material 07 by the printing unit 01 is indicated by a directional arrow ( Fig. 2 ). In the in the Fig. 2 shown printing unit 01 is z. B. in the continuous printing of the rotary printing machine, the first page of the printing material 07, z. B. whose front printed by means of the first printing cylinder 02 and the first side opposite the second side of the printing substrate 07, z. B. whose back is printed in the printing process by means of cooperating with the first printing cylinder 02 second printing cylinder 03. The printing unit 01 of the rotary printing press is thus suitable for printing on opposite sides of the printing substrate 07 simultaneously in perfecting without turning this printing material 07, ie in a simultaneous printing process.

In order to check the register accuracy of printing images to be printed in the continuous printing of the rotary printing press on the two opposite sides of the printing substrate 07 and thus the correct setting of the rotary printing press for the printing process, a method is proposed with the following method steps:
Preferably, during setup of the rotary printing machine, a print image of the first printing cylinder 02 is first printed on the second printing cylinder 03 by the inked with at least one ink first printing cylinder 02 is made in a contact with the second printing cylinder 03, so that during a z. B. triggered at the control center rotation of the juxtaposed printing cylinder 02; 03 a printed image to be printed by the first printing cylinder 02 is transferred directly and directly to the lateral surface of the second printing cylinder 03. Thereafter, the substrate 07, z. B. a single sheet or a sequence of multiple sheets or a printing substrate, through the nip of the two mutually employed printing cylinder 02; 03 out, so that the substrate 07 in contact with the two cooperating printing cylinder 02; 03 is printed such that printed on the second printing unit cylinder 03 printed image is printed on the same side of the printing material 07 together with a same or another each printed by the second printing cylinder 03 in a continuous printing of the rotary printing machine print image. Subsequently, these two printed together on the same side of the printing substrate 07 printed images are checked for their registration and / or also measured.

The z. B. outside of the rotary printing machine, in particular on a test table running check the register accuracy of printed on the same page of the substrate 07 printed images z. B. in that the in the continuous printing of the rotary printing press on the two opposite sides of the printing substrate 07 to be printed images with respect to their relative position to each other z. B. automated or by a person each z. B. with the aid of an optical system then checked whether they are preferably taking into account previously defined tolerances in a predetermined ratio to each other. The specified tolerances are usually in the range of significantly less than 1 millimeter. The relative position of the printing press to be printed in the continuous printing of the rotary printing press on both sides of the printing substrate 07, but to test its register accuracy but jointly printed on the same side of the printing material 07 relationship exists z. B. in that these printed images as congruent or complementary to each other to a single geometric figure or z. B. separated in their respective position from each other in a z. B. are arranged by the setpoint predetermined fixed distance from each other. A deviation, in particular beyond the previously defined tolerances, from the setpoint value specified for this ratio has the effect of reducing the quality. A detected deviation can also z. B. by means of the optical system to determine from the measured value at least one manipulated variable for setting the rotary printing press. The optical system has at least one detection device z. B. in the form of a camera and usually a lighting device and a particular digital image processing device for evaluating the recorded by the at least one detection device photographic image of the relevant printed image or the relevant printed images.

If the tested register accuracy of the printing press to be printed on the opposite sides of the printing substrate 07 during continuous printing of the rotary printing press but jointly printed on the same side of the printing substrate 07 is found to be good, preferably at least for the second printing cylinder 03 to which a printed image was transferred from the first printing cylinder 02, in particular before a start of the continuous printing of the rotary printing machine for the purpose of removing the printed image transferred to it a cylinder washing by this second printing cylinder 03 associated Washing device 06 automatically or manually z. B. is operated from the control room. Optionally, both printing cylinder 02; 03 washed by their respective washing device 04; 06 is actuated.

If the tested register accuracy of the printing presses to be printed on the opposite sides of the printing material 07 in the continuous printing of the rotary printing press but not jointly printed on the same side of the printing material 07 is not considered sufficient, d. H. has not yet been found to meet the required quality, the process steps described above are in each case after an amended, d. H. improved setting of the rotary printing press preferably repeated until the registration is found to be good. The improved setting of the rotary printing machine z. B. due to the determination of the at least one manipulated variable for setting the rotary printing press, as this manipulated variable from the measured value for the determined deviation of the predetermined ratio for the relative position of the imprinting the rotary press on opposite sides of the printing substrate 07 to be printed, for testing their registry but has resulted in common printed on the same side of the substrate 07 printed images of the target value. It is preferably provided that at least the second printing group cylinder 03, to which a printed image has been transferred from the first printing cylinder 02, is washed after each registration check.

That in the Fig. 1 and 2 greatly simplified illustrated printing unit 01 is z. B. Part of the following with reference to Fig. 3 exemplified preferably used in the value printing rotary printing press. The printing unit 01 has, in a cooperative arrangement, the first printing cylinder 02 and the second printing cylinder 03, wherein the first printing cylinder 02 z. B. for the Perfecting and the second printing cylinder 03 z. B. is used for the perfecting. In this arrangement, the printing cylinder 02; 03 can be a through the nip between the first Printing cylinder 02 and the second printing cylinder 03 guided substrate 07, which is designed in particular as a sheet, simultaneously, so be printed on both sides simultaneously. The in the Fig. 3 exemplified rotary printing machine is z. B. formed as a multi-color offset rotary printing machine. Therefore, the two printing cylinder 02; 03 each as a transfer cylinder, in particular each formed as a blanket cylinder. In this exemplified printing unit 01 both the z. B. used for the Perfecting first printing cylinder 02 each z. B. four forme cylinder 11 to 14 and to the z. B. for the perfecting second printing cylinder 03 each z. B. four forme cylinder 16 to 19 employed or at least employable. The form cylinder 11 to 14; 16 to 19 are each referred to as a plate cylinder. To each of the form cylinder 11 to 14; 16 to 19 are each at least one inking unit 21 to 24; 26 to 29 employed or at least employable. In addition, in connection with each inking unit 21 to 24; 26 to 29 each also a dampening unit 31 to 34; 37 to 39, which is needed in a wet offset printing process. The beautiful printing-side inking units 21 to 24 and possibly also the beautiful pressure side dampening units 31 to 34 are z. B. arranged in a movable frame carriage 61. Likewise, the rebate-side inking units 26 to 29 and, where appropriate, the offset-side dampening units 37 to 39 z. B. be arranged in a movable frame carriage 62, wherein both frame carriage 61; 62 are movable apart in each case in the opposite direction and in each direction facing each other zufahrbar, said rack carriage 61; 62 to the stationary arranged printing unit 01 each can be adjusted or turned off. At the periphery of the two printing cylinder 02; 03 are consecutively several, z. B. each arranged three blankets. The form cylinder 11 to 14; 16 to 19 have at their respective perimeter z. B. only a single printing plate, wherein a directed in the circumferential direction printing form length each preferably corresponds with a directed in the circumferential direction blanket length. At the first printing cylinder 02, in particular designed as a blanket washing device washing device 04 is employed or at least unemployable. At the second printing unit cylinder 03, in particular designed as a blanket washing device washing device 06 is employed or at least employable. In addition, an inspection unit 08 is preferably provided, wherein this inspection unit 08 is designed in particular as an optical system with a detection device in the form of a camera and a lighting device. The inspection unit 08 is z. B. also used to check the register validity of printed images.

A provided by a sheet feeder 41 sheet is using a z. B. as a conveyor belt formed first conveyor 42 in the transport direction T of a sheet fed 43, wherein the sheet metal system 43 introduces the relevant sheet in the printing unit 01. The printing unit 01 accepts the relevant sheet from the sheet metal plant 43 z. B. a first transfer drum 44. In an advantageous embodiment of the in the Fig. 3 Rotary printing machine shown by way of example is provided that the straight printing page of the relevant sheet first with at least one ink, preferably with several, z. B. is printed with two inks, each z. B. by irradiation with ultraviolet light (UV) to be dried. For this purpose, a (counter) pressure cylinder 46 is provided in cooperation with the first transfer drum 44, to which a designed as a blanket cylinder transfer cylinder 47 is employed or at least employable. At this transfer cylinder 47 z. B. one or more each designed as a plate cylinder form cylinder 48; 49 employed or at least employable. These form cylinder 48; 49 are each of a further inking unit 51; Colored 52, whereby these inking units 51; 52 in turn, if necessary, in each case with a dampening unit 53; 54 can interact. Of course, a specially designed as a blanket washing device washing device 56 may also be provided for the optionally provided transfer cylinder 47. A in the nip between the impression cylinder 46 and the transfer cylinder 47 z. B. beautiful print side printed with at least one UV-drying ink Printing sheet is preferably initially passed past at least one UV dryer 57 before this sheet is transferred by means of a second transfer drum 58 to the second printing cylinder 03 and guided into the nip between the first printing couple cylinder 02 and the second printing cylinder 03. After a sheet has passed through the nip between the first printing cylinder 02 and the second printing cylinder 03, it can already be inline, ie inspected within the rotary printing machine by means of the inspection unit 08 and z. B. to register validity of his printed images are checked before he then by means of a third transfer drum 63 a z. B. passed as a chain conveyor second conveyor 64 is passed. The second conveyor 64 conveys the sheet from the printing unit 01 to a display 66, the display 66 in particular more, z. B. three delivery tray compartments 67; 68; 69 has.

It is preferably provided that the proposed method in an exemplary according to Fig. 3 Run illustrated rotary printing machine. Because the proposed method allows a simple check of the register on both sides simultaneously printed on a substrate 07 printed images.

LIST OF REFERENCE NUMBERS

01

printing unit

02

Printing cylinders

03

Printing cylinders

04

wash

05

-

06

wash

07

substrate

08

inspection unit

09

-

10

-

11

form cylinder

12

form cylinder

13

form cylinder

14

form cylinder

15

-

16

form cylinder

17

form cylinder

18

form cylinder

19

form cylinder

20

-

21

inking

22

inking

23

inking

24

inking

25

-

26

inking

27

inking

28

inking

29

inking

30

-

31

dampening

32

dampening

33

dampening

34

dampening

35

-

36

-

37

dampening

38

dampening

39

dampening

40

-

41

sheet feeder

42

Conveyor

43

sheet feeder

44

transfer drum

45

-

46

pressure cylinder

47

transfer cylinder

48

form cylinder

49

form cylinder

50

-

51

inking

52

inking

53

dampening

54

dampening

55

-

56

wash

57

UV dryer

58

transfer drum

59

-

60

-

61

racks

62

racks

63

transfer drum

64

Conveyor

65

-

66

display

67

Delivery pile specialist

68

Delivery pile specialist

69

Delivery pile specialist

T

transport direction

Claims (10)

1. A method for checking the maintenance of register of printed images to be printed on two opposite sides of a printing material (07), in which the first side of the printing material (07) is printed in a rotary printing press by means of a first printing unit cylinder (02) and in which the second side of the printing material (07) opposite to the first side is printed in the printing process by means of a second printing unit cylinder (03) cooperating with the first printing unit cylinder (02), characterized in that a printed image from the first printing unit cylinder (02) is printed to the second printing unit cylinder (03), wherein afterwards the printing material (07) is printed in contact with the two cooperating printing unit cylinders (02; 03) by printing the printed image printed to the second printing unit cylinder (03) jointly with a same or a different printed image to be printed respectively in a continuous printing of the rotary printing press from the second printing unit cylinder (03) to the same side of the printing material (07), wherein these printed images printed jointly to the same side of the printing material (07) are subsequently checked with respect to the maintenance of register.
2. The method according to claim 1, characterized in that it is executed during the setup of the rotary printing press and/or that it is used in security printing or in printing on packaging.
3. The method according to claim 1 or 2, characterized in that a single printed sheet or a sequence of printed sheets or a printing material web is used as printing material (07).
4. The method according to claim 1, 2 or 3, characterized in that a rotary printing press printing in an offset printing method is used.
5. The method according to claim 1, 2, 3 or 4, characterized in that the checking of the maintenance of the register of the printed images to be printed in the continuous printing of the rotary printing press on the opposite sides of the printing material (07), however, for checking the maintenance of the register occurring jointly on the same side of the printing material (07) occurs due to the fact that the printed images printed on the same side of the printing material (07) are checked with respect to their relative position to each other as to whether they are in a predefined relation to each other.
6. The method according to claim 5, characterized in that the relationship relating to the relative position of the printed images to be printed on both sides of the printing material (07) consists in the fact that these printed images are arranged congruently or complementing each other into a single geometric figure or separated from each other in their respective position at a predefined fixed distance to each other.
7. The method according to claim 5 or 6, characterized in that in the case of a deviation of the predefined relationship from a set point value, the noticed deviation is measured and at least one control variable for setting the rotary printing press is determined from the measured value.
8. The method according to claim 5, 6 or 7, characterized in that the checking of the maintenance of the register is executed outside of the rotary printing press on a checking table.
9. The method according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that at least the second printing unit cylinder (03), to which a printed image from the first printing unit cylinder (02) was transferred, is washed prior to the continuous printing of the rotary printing press and/or after each checking of the maintenance of the register.
10. The method according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that the checking of the maintenance of the register performed within the rotary printing press or outside of the rotary printing press on a checking table is respectively executed by means of an optical system (08), wherein the optical system (08) respectively has at least one detection device and an image-processing device for evaluating the respective image of the relevant printed image or of the relevant printed images detected by the detection device.

Images