EP0295433B1 - Procédé pour mesurer le registre, tel qu'utilisé dans l'offset pour contrôler le positionnement des clichés - Google Patents

Procédé pour mesurer le registre, tel qu'utilisé dans l'offset pour contrôler le positionnement des clichés Download PDF

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Publication number
EP0295433B1
EP0295433B1 EP88107702A EP88107702A EP0295433B1 EP 0295433 B1 EP0295433 B1 EP 0295433B1 EP 88107702 A EP88107702 A EP 88107702A EP 88107702 A EP88107702 A EP 88107702A EP 0295433 B1 EP0295433 B1 EP 0295433B1
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EP
European Patent Office
Prior art keywords
register
lines
sight
sequence
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88107702A
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German (de)
English (en)
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EP0295433A3 (en
EP0295433A2 (fr
Inventor
Helmut Prof. Dr. Ing. Kipphan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0295433A2 publication Critical patent/EP0295433A2/fr
Publication of EP0295433A3 publication Critical patent/EP0295433A3/de
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Publication of EP0295433B1 publication Critical patent/EP0295433B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks

Definitions

  • the invention relates to a register measuring system, as is used in the offset printing area for checking the position of the printing plates.
  • register marks By means of these register marks, position regulation is possible in such a way that the relative superimposition of the individual register marks is assessed or recorded. If the registration crosses of the individual printing plates are not in a relative superposition, the degree of deviation is usually determined by inspecting the viewer. The regulation is carried out on the relevant printing plate and this is repeated until the register marks of all colors match one another.
  • EP-A-0 133 120 Furthermore, a corresponding optical device is described in EP-A-0 133 120.
  • the application comprises a microscope which consists of a first magnifying glass, which makes it possible to obtain an enlarged, real image, which can be observed directly through an eyepiece, and a second magnifying glass, which makes it possible to view the image in an image plane enlarge.
  • a photosensitive device is arranged perpendicular to the general direction of the optical axis. The image recorded in this way can be processed further by means of an evaluation device.
  • the object of the present invention is therefore to create a register measuring system in which the measuring device is designed to be handy and in which automatic color detection can be dispensed with. Furthermore, the measuring system should be able to automatically compensate for incorrect positioning of the measuring device.
  • the device shown in FIG. 2, which represents an exemplary embodiment, is designed as a separately operating hand-held device, all parts being accommodated in a housing, which is only indicated here.
  • the external design of the device largely corresponds to a hand densitometer. It goes without saying that other designs are also possible.
  • the device is also suitable for connection to a motorized register control of the printing press.
  • the device contains a visor 1 embedded in the floor and a magnifying glass 2 through which the registration mark 3 located within the visor 1 can be viewed. It goes without saying that the magnifying glass 2 can also be replaced by another optical means that serves the same purpose.
  • the visor 1 is approximated to the geometrical dimensions of the registration mark to be measured, or is made slightly larger.
  • the visor 1 has a rectangular basic shape, in which a corner is provided with a bevel 6. Furthermore, in the center of the straight lines forming the rectangular basic shape, at right angles to these, there is in each case a recess representing a slot 5.
  • the measuring device is constructed in such a way that it must be positioned so that the intended cross marks 4 lie within the slots 5, so that it is ensured that the complete register mark 3 is in the measuring range.
  • the bevel 6 of one corner of the visor 1 allows the device to be put on more easily and correctly. In particular, this also provides effective protection against unwanted rotation of the device by 180 degrees, so that alignment errors are largely excluded.
  • the registration mark 3 can additionally be illuminated by one or more lamps 19.
  • the registration mark 3 is measured by a foldable mirror or, as shown in the embodiment, by a semi-transparent mirror 7.
  • the mirror 7 can also be replaced by another means which serves the same purpose.
  • the light remitted by the registration mark 3 is deflected by the mirror 7 in the direction of the diode rows 8.
  • the register marks are imaged on the diode cells 8 via the magnifying glass 11.
  • possibly disturbing light can be shielded through the magnifying glass 2 either by a mechanically pivoted diaphragm or a mirror, instead of the semitransparent mirror 7.
  • the same effect can be achieved by an optoelectronically controlled window 17 which shields incident light through the magnifying glass 2 during the measuring process, which advantageously means that no moving parts are required.
  • an IR filtering is carried out on the filter glass pane 9.
  • a further filtering is carried out using an optimal color filter 10, for example a blue filter.
  • the optimal color filter 10 effects a modification of the lines in such a way that the lines of all colors have a sufficient contrast to the background and are therefore measured with approximately the same resolution by the two diode lines standing perpendicular to one another according to the registration mark can.
  • the magnifying glass 11 attached between the optimal color filter 10 and the light receiving unit 18 enables an enlarged image of the registration mark 3 in the plane of the diode rows 8.
  • the diode rows 8 are provided with cylindrical lenses 12.
  • Attaching the cylindrical lenses 12 to the diode rows 8 advantageously has the effect that the (sharp) image is maintained transversely to the lines of the registration mark 3, but is changed in the longitudinal direction in such a way that averaging over a larger area (for example 2 mm).
  • the line widths which are relatively strongly structured by the printing process, in particular by the paper surface and thus fluctuate in the fine structure are advantageously averaged and reproducibly measured.
  • FIG. 4 shows the intensity curve over the diode row 8.
  • the photodiode 13 mounted in the vicinity of the diode rows 8 determines, in addition to the measuring process, the total of the light remitted by the paper and the registration mark 3 and thereby allows the exposure time of the diode rows 8 to be controlled as a function of the light intensity and the state of the electronics.
  • the measurement signal is evaluated in evaluation electronics (not shown) in such a way that first the positions of the line edges are determined and the position of the lines is determined therefrom (center of the line). Since the distance 14 between the two outermost B lines 28, 29 is fixed (for example 6 mm), the distance of all lines relative to the first can be determined in 1/100 mm regardless of whether the device is placed opposite the registration mark; as long as all lines are in the measuring range.
  • register marks 3 are to be measured in which the spacing of the outermost reference lines 28, 29 have a dimension that deviates from the basic dimension (e.g. 6 mm), then the device must be calibrated thereon in a special measuring mode.
  • a prerequisite for an automatic calibration is a basic calibration of the device, through which an assignment between the light receiving unit 18 and the geometric spacing of lines on the sheet has taken place. This basic calibration is carried out with a special calibration mark with an absolutely fixed, known distance between the lines.
  • the tolerance for the angular alignment when the device is positioned on the registration mark 3 can be increased considerably in a further embodiment, for example if a certain angular range is scanned internally by rotating the diode rows 8.
  • the minimum distance between the base strokes found is taken as the reference dimension (Fig. 5).
  • B Black
  • Any other color can also be selected and specified as the base color. Then the registration error of the remaining colors against this color is determined.
  • the device can also independently determine, display and display the optimal stand color based on specified criteria if necessary, use it when passing it on to the printing press. For example, the smallest number of printing units that are necessarily to be adjusted, the smallest adjustment path of all printing units, etc., or combinations of such individual criteria can be used as criteria as a basis for the decision.
  • the device can also adopt positions that differ from these as target positions. This can e.g. done by a proof or after a manual correction of an OK sheet.
  • the positions of the registration marks 3 on the sheet can be fed to the device by key input 15 or by means of a coded measurement of the registration mark 3. From this an average registration error of the individual colors of several registration marks 3 can be determined, which indicates which adjustment of the registers leads to averaging of the registration errors of the selected registration marks 3.
  • the device is checked with the help of a specified "normal pass mark".
  • the recommended settings calculated by the device are shown directly on the display 16 of the device and can be logged by a connected printer. However, they can also be transferred directly to the control panel of the printing press or to control the motors for the circumferential and side registers and can be used for direct adjustment or regulation of the registers.
  • the use of the register cross reader is also possible for in-line measurement, ie for measurement within the machine, for example on the last printing cylinder or, in the case of perfecting and printing, additionally on the last printing cylinder before the turn, provided that appropriate triggering and measurement time optimization.
  • the registration mark 3 used in the exemplary embodiment is distinguished by the following advantageous features:
  • the registration mark can be measured automatically with a register cross reader as well as assessed visually. It is suitable for several colors, whereby the register cross reader used does not have to have technically complex color recognition; ie measurement without color detection is also possible.
  • the defined spacing of the lines eg 6 mm between the first and the last line
  • each individual register cross 4 can be determined for automatic evaluation, both with regard to the face and reverse side, and with regard to the position on the sheet.
  • the space requirement is very small at around 7 x 17 mm, with the 7 mm across the running direction being of particular importance.
  • the registration mark shown in Fig. 6 represents a complete registration mark 3.
  • the mark consists of two groups of stroke sequences 31 (one for circumferential registers and one for side registers), the individual strokes of the stroke sequences 31 being arranged so that each stroke when pressed together is somewhere else.
  • the base spacing of the two lines 28 and 29 is, for example, 6 mm and the spacing 30 between the lines 28 of different colors ,. for example 1 mm.
  • the registration error can be a maximum of +/- 0.5 mm in any color and in any direction. In the illustrated embodiment, up to six colors are possible.
  • each color separation has a register cross 4, which can be assessed by eye inspection with regard to the registration accuracy. Furthermore, the register cross 4 can be used to align the automatic register cross reader.
  • the intersecting straight lines can have different interruptions 25 representing the individual color separation. This measure advantageously makes it easier to assign the respective color separation with regard to the assessment.
  • Each color separation contains two lines that are generally perpendicular to each other and in one of the color separations (e.g. register cross B) an additional line in each of the directions, which is at a defined distance 14 (e.g. 6 mm) parallel to the other.
  • This defined distance 14 is determined by the register cross reader and is used to obtain the image scale of the measuring optics and to base the evaluation. This inclusion of the imaging scale creates the possibility of also using measured values from a passer reading device which is set at an angle or rotated relative to the registration marks without a measurement error occurring.
  • a registration mark 3 in which only the color X has a registration error can be seen in FIG. 8.
  • the five small dots 32 serve on the one hand as a minimum limitation for trimming the films of the different color separations and on the other hand for checking the correct position of the marks when the color separations are assembled individually.
  • Fig. 8 shows a registration error with regard to the color separation X.
  • 9a - 9d show an example of how an additional coding 33 for face and reverse printing and for position 34 can be attached to the sheet on a registration mark. This is preferably done in the color which contains two lines 28 and 29 in each direction, since this registration mark 3 serving as a reference is present in every case. This marking advantageously does not take up any additional space transversely to the direction of travel and can be read when measuring the mark.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (20)

  1. Dispositif de détermination de l'erreur de repérage d'impressions en plusieurs couleurs produites par des machines à imprimer, se composant des particularités suivantes que contient un boîtier :
    a) un collimateur (1) qui est monté dans la surface du fond du boîtier,
    b) une première loupe (2) qui est à distance du collimateur (1) et dont l'axe optique est orienté sur le collimateur (1),
    c) un miroir (7) qui est monté entre la première loupe (2) et le collimateur (1) et qui dévie la lumière réfléchie à l'intérieur du collimateur (1),
    d) un appareillage (18) récepteur de lumière et recevant le rayonnement de la lumière déviée par le miroir (7),
    e) un appareillage d'analyse qui dépouille l'information de la lumière reçue par l'appareillage récepteur de lumière (18), caractérisé en ce que le collimateur (1) présente une géométrie de base qui correspond approximativement aux dimensions géométriques du repère (3), en ce que la géométrie de base du collimateur (1) présente, dans la zone dans laquelle se trouvent les droites de la croix de repère (4), une autre entaille (5) en forme de fente, en ce que le collimateur (1) comporte un coin cassé (6) et en ce que l'appareillage (18) récepteur de lumière est formé de deux alignements de diodes qui sont perpendiculaires l'un à l'autre, la position relative des alignements de diodes correspondant à la position relative des supports d'information que comprend le repère (3).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'un dispositif (17) pouvant faire écran contre la lumière éventuellement incidente et gênante est prévu entre la première loupe (2) et le miroir (7).
  3. Dispositif selon la revendication 1, caractérisé en ce qu'une seconde loupe (11) est montée sur le trajet du rayon lumineux entre le miroir (7) et l'appareillage récepteur de lumière (18).
  4. Disposition selon les revendications 1 et 3, caractérisé en ce qu'une filtre (10) est monté sur le trajet du rayon lumineux entre le miroir (7) et la seconde loupe (11).
  5. Dispositif selon la revendication 1, caractérisé en ce qu'un moyen (19) d'éclairage du collimateur (1) est prévu et placé au-dessus du collimateur (1).
  6. Dispositif selon la revendication 1, caractérisé en ce qu'un clavier (15) est prévu pour permettre d'envoyer des informations supplémentaire au dispositif d'analyse.
  7. Dispositif selon la revendication 1, caractérisé en ce qu'une photodiode (13) est prévue pour déterminer la lumière réfléchie par le repère (3) et par le papier.
  8. Dispositif selon la revendication 1, caractérisé en ce que des lentilles cylindriques (12) sont disposées devant les alignements de diodes (8).
  9. Dispositif selon la revendication 1, caractérisé en ce qu'un disque de verre filtrant (9) est monté entre le collimateur (1) et le miroir (7).
  10. Dispositif selon la revendication 1, caractérisé en ce que les alignements de diodes (8) sont montés rotatifs par rapport à l'orientation angulaire.
  11. Repère pour effectuer des mesures automatiques au moyen d'un dispositif selon la revendication 1 et pour l'évaluation visuelle d'erreurs de repérage sur des produits réalisés au moyen de machines d'impression, le repère (3) se composant des particularités suivantes :
    a) une croix de repère (4) formée de deux droites qui se coupent perpendiculairement,
    b) un cercle (27) dont le centre est situé au point d'intersection de la croix de repère (4),
    c) une première succession de traits (31) qui est parallèle à la droite verticale de la croix de repère (4) et dont les traits sont perpendiculaires à la droite verticale et une seconde succession de traits (31) qui est parallèle à la droite horizontale de la croix de repère (4) et dont les traits sont perpendiculaires à la droite horizontale,
    c1) un trait de chaque succession de traits étant défini comme étant un trait de référence (par rapport auquel les autres traits de la succession sont à une distance déterminable) et
    c2) chacun des autres traits de la succession représente un tirage déterminé en couleur.
  12. Repère selon la revendication 11, caractérisé en ce que chaque tirage en couleur comprend une croix de repère (4) dont les droites comportent des interruptions (25) qui diffèrent de celles de chacun des autres tirages en couleur.
  13. Repère selon la revendication 11, caractérisé en ce que chaque tirage en couleur comprend un trait faisant partie de la succession de traits (31) et dont la distance au trait de référence est différente de celle des traits des autres tirages en couleur.
  14. Repère selon la revendication 11, caractérisé en ce que la distance (30) séparant les traits de la succession de traits (31) est supérieure au double de l'erreur de repérage maximale attendue.
  15. Procédé d'identification du côté recto et du côté verso lors d'une mesure de l'erreur de repérage au moyen d'un dispositif tel que spécifié dans la revendication 1, caractérisé en ce qu'un repère (3) qui est prévu comprend un codage (33) pour une impression recto ou une impression verso, ce codage étant lu simultanément par le dispositif et étant interprété automatiquement.
  16. Procédé d'identification du côté d'impression verso et du côté d'impression recto lors d'une mesure de l'erreur de repérage au moyen d'un dispositif tel que spécifié dans la revendication 1, caractérisé en ce qu'une entrée d'instruction pour l'impression recto ou verso a lieu avant la mesure.
  17. Procédé d'identification du côté d'impression verso et du côté d'impression recto lors d'une mesure de l'erreur de repérage au moyen d'un dispositif tel que spécifié dans la revendication 1, caractérisé en ce que le dispositif présente un positionnement de base pour impression recto ou verso, ce positionnement pouvant si nécessaire être modifié pour la mesure suivante par une entrée d'instruction.
  18. Procédé d'identification du côté d'impression recto et verso lors d'une mesure de l'erreur de repérage au moyen d'un dispositif tel que spécifié dans la revendication 1, caractérisé en ce qu'avant un ordre d'impression, une entrée d'instruction a lieu et permet de communiquer au dispositif les couleurs qui apparaissent sur le côté d'impression verso et/ou recto.
  19. Procédé d'identification de la position d'un repère sur une feuille au moyen d'un dispositif tel que spécifié dans la revendication 1 et/ou dans la revendication 10, caractérisé en ce que chaque repère est muni d'une information (codage) à l'aide de laquelle la position du repère est identifiable.
  20. Dispositif selon la revendication 1, caractérisé en ce que des moyens sont prévus pour déterminer et afficher la couleur de base optimale.
EP88107702A 1987-06-13 1988-05-13 Procédé pour mesurer le registre, tel qu'utilisé dans l'offset pour contrôler le positionnement des clichés Expired - Lifetime EP0295433B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3719766 1987-06-13
DE19873719766 DE3719766A1 (de) 1987-06-13 1987-06-13 Registermesssystem

Publications (3)

Publication Number Publication Date
EP0295433A2 EP0295433A2 (fr) 1988-12-21
EP0295433A3 EP0295433A3 (en) 1990-03-14
EP0295433B1 true EP0295433B1 (fr) 1992-12-23

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EP88107702A Expired - Lifetime EP0295433B1 (fr) 1987-06-13 1988-05-13 Procédé pour mesurer le registre, tel qu'utilisé dans l'offset pour contrôler le positionnement des clichés

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Country Link
US (1) US4963029A (fr)
EP (1) EP0295433B1 (fr)
JP (1) JP2505535B2 (fr)
CA (1) CA1329644C (fr)
DE (2) DE3719766A1 (fr)
ES (1) ES2037762T3 (fr)

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JPS6048357A (ja) * 1983-08-29 1985-03-16 Miyakoshi Kikai Seisaku Kk 多色刷輪転印刷機における印刷見当調整方法
JPS6072731A (ja) * 1983-09-30 1985-04-24 Dainippon Printing Co Ltd 色間見当プリセツト装置
US4652914A (en) * 1984-04-27 1987-03-24 Dainippon Screen Mfg. Co., Ltd. Method of recording register marks
DE3446355C2 (de) * 1984-12-19 1986-11-06 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optisches Fehlersuchgerät
JPS61195845A (ja) * 1985-02-27 1986-08-30 Toppan Printing Co Ltd 印刷状態検査装置
JPS61221609A (ja) * 1986-03-20 1986-10-02 Canon Inc 光電検出光学装置
DE3614578A1 (de) * 1986-04-30 1987-11-05 Koenig & Bauer Ag Registersystem fuer eine rotationsdruckmaschine

Also Published As

Publication number Publication date
JP2505535B2 (ja) 1996-06-12
JPS63317344A (ja) 1988-12-26
EP0295433A3 (en) 1990-03-14
DE3719766C2 (fr) 1990-07-19
DE3876860D1 (de) 1993-02-04
US4963029A (en) 1990-10-16
DE3719766A1 (de) 1988-12-22
CA1329644C (fr) 1994-05-17
ES2037762T3 (es) 1993-07-01
EP0295433A2 (fr) 1988-12-21

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