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EP0541990B1 - Registerregelung in einer rotierenden Druckmaschine - Google Patents

Registerregelung in einer rotierenden Druckmaschine Download PDF

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Publication number
EP0541990B1
EP0541990B1 EP92117794A EP92117794A EP0541990B1 EP 0541990 B1 EP0541990 B1 EP 0541990B1 EP 92117794 A EP92117794 A EP 92117794A EP 92117794 A EP92117794 A EP 92117794A EP 0541990 B1 EP0541990 B1 EP 0541990B1
Authority
EP
European Patent Office
Prior art keywords
row
photosensitive elements
fact
marks
bar
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
EP92117794A
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English (en)
French (fr)
Other versions
EP0541990A1 (de
Inventor
Patrick Monney
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.)
Bobst Mex SA
Original Assignee
Bobst SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bobst SA filed Critical Bobst SA
Publication of EP0541990A1 publication Critical patent/EP0541990A1/de
Application granted granted Critical
Publication of EP0541990B1 publication Critical patent/EP0541990B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices

Definitions

  • the present invention relates to a device for controlling the register in a rotary printing machine, which device comprises a reading head of registration marks generally printed in the margin in order to detect possible offsets between the prints of each color, this device subsequently generating correction orders to act either on the path of the paper strip, or on the position of the corresponding plate cylinder.
  • CMOS complementary metal-oxide-semiconductor
  • CMOS complementary metal-oxide-semiconductor
  • the registration marks are here in the form of transverse lines of width substantially greater than the reading diameter of the photoelectric cell. For example, for a cell with a reading diameter of 6 mm, the width of the mark will be approximately 10 mm, thus leaving a clearance of 2 mm on both sides.
  • the marks are triangular and small, that is to say about a width of 3 mm for a length of 6 mm, in order to increase the surface of paper available for the 'impression.
  • the triangular appearance of these marks allows, by analysis of the departure and intensity of the pulse received, to determine both the longitudinal and lateral error of the corresponding impression.
  • the reading surface of the head is significantly reduced - of the order of a millimeter - it appears necessary to motorize the positioning in the lateral direction of this head in order to be able, if necessary, to catch up with an effect of a temporary shift of the web. This motorization of the movement of the head unfortunately involves a heavier structure which affects construction costs.
  • document EP-A-0403082 describes a device for controlling the register in a printing machine using a read head with small reference marks, this head comprising two rows of photosensitive elements arranged transversely to the running of the strip. This device allows the determination of register errors both longitudinal and lateral.
  • the object of the present invention is a device for checking the register in a rotary printing machine which can operate from reading particularly small marks, that is to say of the order of a square millimeter or less, which ensures as good a precision of the tracking control as the known devices, but which works fast enough to allow the tape running speeds much higher.
  • a device Preferably, such a device must be able to establish the errors both longitudinally and laterally, either with marks side by side or with marks in succession according to the available space remaining on the strip of paper.
  • the design of this device must remain simple enough to allow its realization at a reasonable cost.
  • a register control device in a rotary printing machine, using a reading head of printed registration marks, because the reading head comprises a row of discrete photosensitive elements arranged along a transverse axis. when the strip travels in a plane situated above and parallel to this strip, followed, in this same plane, by a linear video strip parallel to the row of photosensitive elements.
  • This device further comprises a microprocessor selecting the photosensitive element used according to the momentary lateral offset of the strip and controlling the read operations of the linear video strip.
  • the row of discrete photosensitive elements can consist of around twenty surface-type photodiodes of about 0.7 mm 2 arranged approximately every millimeter. Such a row of photodiodes is, for example, marketed by the company Integrated Photomatrix Limited under the name IPL 10 220.
  • the linear video strip can be a CCD video component such as that marketed by the company FAIRCHILD under the reference 145DC comprising 2,048 elements photosensitive over a width of 20 mm.
  • the advantage is that the photodiodes in the row are directly addressable and instantly send back a pulse when passing a mark, while the CCD linear video strip returns very precise information as to the lateral position of the passage of the mark.
  • the device comprises a second row of discrete photosensitive elements, arranged in parallel between the first row of discrete photosensitive elements and the linear video strip. Thanks to this arrangement, it becomes possible, with the same read head, to analyze marks side by side as well as marks which follow one another.
  • the microprocessor can be used to determine the speed of travel of the strip continuously from the detection of a mark successively by a discrete photosensitive element of the first then of the second row in order to trigger the strip.
  • linear video only when passing the mark under it.
  • the linear video bar working by integration of light over time for a given lighting intensity, the triggering of this bar only at the right time allows to maintain a maximum contrast between the element (s) not lit by the presence of the brand and the other lit elements.
  • each row of discrete photosensitive elements is connected to a preamplification and multiplexing circuit controlled by the microprocessor for the selection of the discrete reading element used momentarily, circuit whose output is connected to an amplifier with selectable gain then to a ramp stiffening circuit to contrast the amplified pulse received during the passage of a mark under the selected photosensitive discrete element.
  • the output of the video signal from the preamplification and control circuit of the video bar is connected to an amplification circuit with selectable gain, the output of which is connected to a ramp stiffening circuit to contrast the pulse received during the passage. of a mark under the bar, which pulse is re-applied to the microprocessor for the determination of the lateral position of the passage of the mark and reinitialization of the bar.
  • the plane in which the row or rows of discrete photosensitive elements and the video bar are located is set back from the strip of paper, a lens interposed between this strip and this plane projecting the image of the marks onto these photosensitive means.
  • This configuration allows easy installation of lighting means, such as light spots or synchronized flashes, to properly illuminate the area through which the registration marks must pass.
  • the device described above is particularly advantageous insofar as the method of determining the register error from marks situated side by side consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each coming from almost simultaneously of one of the discrete photosensitive elements selected respectively in the right half and left half of the first or of the second row, and the lateral error by comparison of the centers of the different positions recorded almost simultaneously by the linear video bar .
  • the device described above is also particularly advantageous in that the method of determining the register error from marks located one behind the other consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each from one of the photosensitive elements selected respectively in the first and second row, the distance separating these two rows being equal to the expected distance between the two marks, and the lateral error by comparison of the centers of the positions, normally identical, recorded successively by the linear video bar.
  • the device comprises a read head housing 17 equipped with a lens 18 and two light spots 15 placed on each side of the lens and lighting up an area 14 on a strip of paper 10 scrolling under this head 17.
  • On this strip of paper 10 are printed, as and when passing through the different color printing stations, that is to say marks side by side 12, either marks following each other 11.
  • Behind the objective 18 are arranged in a plane parallel to the paper strip 10, two rows of photodiodes 20 and 21 and a linear video strip CCD 30 parallel to each other and transverse by relative to the direction of movement of the strip.
  • the focal length of the objective 18 and the distances between this objective and, on the one hand, the strip of paper 10 and, on the other hand, the reading elements 20, 21 and 30 are determined so that these elements receive an image not enlarged, it being understood that, depending on the reading components 20, 21, 30 used, it may be preferable to modify these parameters to obtain a slight enlargement.
  • the rows of discrete photosensitive elements 20 and 21 are identical and are in the form of two components sold by the Company Integrated Photomatrix Limited under the name IPL 10 220. This component contains in a box a row of 22 elements of 0.66 mm2 each arranged every 1.08 mm. These two rows of photodiodes 20 and 21 are spaced apart from each other by a distance of the order of 20 mm corresponding to the normal difference expected between two marks following each other.
  • Each of the photodiodes in row 20 (21) is connected to one of the inputs of a multiplexer circuit 24 (25) by one of the connections of a bundle 22 (23). Circuits 24 and 25, commonly available commercially, include a preamplifier at each input, one of which outputs only is connected to a second amplification stage by a selection circuit controlled by the microprocessor 50.
  • the selected and preamplified pulse is then sent to a selectable gain amplifier circuit 26 (27), the gain of which is established, through the microprocessor 50, to compensate for the effects due to the shiny or matt appearance of the paper strip. or due to the more or less contrasted, even equally brilliant, color of the registration marks.
  • the amplified pulse is then applied to a circuit 28 (29) transforming the oblique flanks into steep flanks.
  • This type of ramp stiffening circuit known to a person skilled in the art, can comprise a first peak detection circuit whose value is slightly reduced by a resistance bridge before being applied to the positive terminal of a comparator, the negative terminal directly receiving the initial pulse. The comparator then switches abruptly when the offset of the pulse with respect to the base voltage is less then more than a predetermined value.
  • circuit 40 comparing the phase shift with particular reference to the middle of the pulses.
  • the linear video bar 30 consists of a row of 2,048 detector elements separated by stop channels and covered by a passivation layer of silicate dioxide. Photons pass through the layer of silicate dioxide and are absorbed into the individual silicate crystals creating pairs of holes and electrons. These electrons generated by photons are accumulated in photosensitive sites. The amount of charge accumulated in each photosensitive site is a linear function of the incident light intensity and the integration period.
  • An integration control terminal makes it possible to reduce and control the integration time of each photosensitive element.
  • the output signal varies continuously from a basic value corresponding to thermal agitation for zero illumination, up to a maximum of saturation corresponding to thermal agitation for intense lighting.
  • the component has two transfer doors adjacent to the rows of photosensitive elements.
  • the charge packets accumulated in the photosensitive elements are then transferred to the transport registers through these transfer gates, each time the voltage applied to the transfer terminal becomes high.
  • Load packets are transferred alternately to one of the two registers.
  • the transport registers are used to move the charge packets generated by the light in serial mode to a lateral amplifier.
  • a complementary relationship between the two transport registers makes it possible to reconstruct the initial chronology of the charge packets in order to constitute at the output a sequence of video lines.
  • a CCD charge coupled component is a semiconductor element in which discrete isolated charge packets are transported from one position in the semiconductor to an adjacent position by the sequential action of a row of doors. These charge packets are minority carriers with respect to the semiconductor substrate.
  • the video output 32 passes through a circuit 34 for preamplification and also for controlling the CCD, in particular for the start and end of integration tops, before being amplified in a circuit 36, the gain of which can be pre-established. again according to the quality of the paper tape and / or the marks.
  • the video signal comprising one or two pulses is then applied to circuit 38 identical to circuits 28 and 29 making it possible to straighten and increase the contrast of the pulses present before being re-applied to the microprocessor 50 for analysis.
  • the device described above operates in the following manner, namely: In the case of detection marks 12 printed side by side as and when successive prints, the row of photodiodes 20 is virtually divided into two halves, the microprocessor selecting in the multiplexer 24 two diodes, one in each half, corresponding to the positions of the expected passages of the marks 12 as defined during an initialization phase or during previous measurements. If the prints are in register, the marks 12 are rigorously side by side and will influence their respective photodiodes simultaneously, causing the circuit 40 to observe no phase shift in the pulses in amplified slots. In the event of a print offset, a phase shift appears in the pulses received, making it possible to conclude in advance or in delay of the offending cylinder.
  • the marks 12 side by side pass almost simultaneously under the linear video strip 30, they each influence a distinct region of photosensitive elements resulting in two pulses in the output video signal including the deviation can be accurately measured by the microprocessor from the midpoints of the amplified square pulses.
  • This measurement can be performed, for example, using the number of pulses counted from an internal clock of the microprocessor triggered by a first pulse and then stopped by a second pulse.
  • the microprocessor 50 orders the multiplexers 24 and 25 to connect, in alignment, a photodiode of the strip 20 and 21 respectively.
  • these two arrays of photodiodes being equal to the expected spacing between the marks 11, the two selected photodiodes should generate a pulse simultaneously resulting, in the comparison circuit 40, again by the observation of a zero phase shift.
  • the measurement of the phase shift makes it possible to conclude in advance or in delay of the offending impression.
  • the linear video bar 30 reads the first mark 11 generating a first video signal, then resets to read the second mark.
  • the period required for this video module to perform a reading and then a reset being of the order of 500 micro-seconds with an internal operating clock of 4 MHz, it can completely read each of the brands which, in the in the case of a 20 mm gap for a tape running speed of 20 m / s, follow each other at a millisecond interval.
  • the microprocessor compares the lateral position of each of the marks, which can be done in the form of a pulse count. a clock triggered by a start signal and stopped by the middle of the amplified square pulse representing the passage of this mark.
  • the device according to the invention can very easily detect particularly small mark position errors: less than or equal to one square millimeter, on a strip moving at high speed, this is that is to say at 20 m / s or more. Due to the fact that all fragile elements, in particular electronic detectors, can be enclosed inside a solid and waterproof housing 17 equipped with a lens and light spots, this device can withstand the constraints of the industrial environment. The majority of the optical, opto-electric or electronic components constituting this device being commercially available, the cost of its production remains reasonable. Many improvements can be made to this device in the context of this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Record Information Processing For Printing (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Projection-Type Copiers In General (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Handling Of Sheets (AREA)

Claims (8)

  1. Registerkontrollvorrichtung in einer rotierenden Druckmaschine mit einem Lesekopf zum Ablesen von auf der Bahn (10) aufgedruckten Passermarken (11, 12), dadurch gekennzeichnet, dass der Lesekopf (17) eine Reihe (20) getrennter lichtempfindlicher Elemente umfasst, die auf einer Achse quer zur Bahndurchlaufrichtung auf einer Ebene oberhalb und parallel zur besagten Bahn angeordnet sind, woran auf dieser selben Ebene eine lineare Videoschiene (30) parallel zur Reihe der lichtempfindlichen Elemente anschliesst,und dass diese Vorrichtung einen Mikroprozessor (50) umfasst, der das lichtempfindliche Element anwählt, welches je nach der momentanen seitlichen Verschiebung der Bahn verwendet wird, und den Lesevorgang der linearen Videoschiene steuert, anwählt.
  2. Vorrichtung gemäss Patentanspruch 1, dadurch gekennzeichnet, dass der Lesekopf (17) eine zweite Reihe (21) getrennter lichtempfindlicher Elemente umfasst, die parallel zwischen der ersten Reihe (20) der getrennten lichtempfindlichen Elemente und der linearen Videoschiene (30) angeordnet ist.
  3. Vorrichtung gemäss Patentanspruch 2, dadurch gekennzeichnet, dass der Mikroprozessor (50) die Durchlaufgeschwindigkeit der Bahn (10) von der Erkennung einer Passermarke nacheinander von einem lichtempfindlichen Element der ersten (20) und dann der zweiten (21) Reihe bestimmt, um die lineare Videoschiene (30) nur beim Durchlauf der Passermarke unter derselben zu betätigen.
  4. Vorrichtung gemäss einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, dass jede Reihe (20, 21) der getrennten lichtempfindlichen Elemente mit einem Vorverstärkender- und Mehrkanalschaltkreis (24, 25), der durch den Mikroprozessor (50) für die Anwahl des momentan zu verwendenden, Leseelements gesteuert wird, verbunden ist, wobei der Ausgang dieses Schaltkreises an einen Verstärker (26, 27) mit wählbarer Leistung und anschliessend an einen Impulsformer (28, 29) angeschlossen ist, um den verstärkten Impuls, welcher beim Durchlauf einer Passermarke unter dem angewählten, getrennten lichtempfindlichen Element empfangen wird, zu kontrastieren.
  5. Vorrichtung gemäss einem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, dass der Ausgang des Videosignals des Vorverstärker- und Kontrollschaltkreises (34) der Videoschiene (30) an einen Verstärker (36) mit wählbarer Leistung verbunden ist, dessen Ausgang an einen Impulsformer (38) angeschlossen ist, um den beim Durchlauf einer Passermarke unter der Schiene empfangenen Impuls zu kontrastieren, wobei der besagte Impuls wieder dem Mikroprozessor (50) zugeführt wird.
  6. Vorrichtung gemäss einem der vorerwähnten Patentansprüche, dadurch gekennzeichnet, dass sich die Ebene mit der Reihe oder den Reihen (20, 21) der lichtempfindlichen Elemente und die Videoschiene (30) in einer gewissen Distanz zur Bahn (10) befindet, wobei ein zwischen dieser Bahn und der Ebene eingefügtes Objektiv (18) das Bild der Passermarken (11, 12), die eine durch Mittel (15), die sich im Lesekopf (17) befinden, beleuchtete Zone (14) durchlaufen, auf diese lichtempfindlichen Elemente und die Videoschiene projiziert.
  7. Verfahren zur Bestimmung des Passerfehlers mittels Grund von nebeneinanderliegender Passermarken (12) unter Verwendung der Vorrichtung gemäss dem Patentanspruch 1, dadurch gekennzeichnet, dass der Passerfehler in Längsrichtung durch Messen einer etwaigen Verschiebung zwischen den Zentren der beiden Impulse, die sozusagen gleichzeitig von den getrennten lichtempfindlichen Elementen, die in der rechten und linken Hälfte der Reihe (20) angewählt werden, ausgesendet werden, und der Passerfehler in Querrichtung durch Vergleichender Zentren der verschiedenen durch die lineare Videoschiene (30) sozusagen gleichzeitig registrierten Positionen bestimmt wird.
  8. Verfahren zur Bestimmung des Passerfehlers Mittelshintereinanderliegender Passermarken (11) unter Verwendung der Vorrichtung gemäss dem Patentanspruch 2, dadurch gekennzeichnet, dass der Passerfehler in Längsrichtung durch Messen einer etwaigen Verschiebung zwischen den Zentren der beiden Impulse, die beide von einem der angewählten getrennten lichtempfindlichen Elemente in der ersten (20) und zweiten (21) Reihe ausgesendet werden, wobei die Distanz zwischen diesen beiden Reihen gleich gross ist wie die zwischen den beiden Passermarken (11) erwartete Distanz, und der Passerfehler in Querrichtung durch Vergleichen der Zentren der normalerweise identischen, durch die lineare Videoschiene nacheinander registrierten Positionen bestimmt wird.
EP92117794A 1991-11-14 1992-10-19 Registerregelung in einer rotierenden Druckmaschine Expired - Lifetime EP0541990B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3318/91 1991-11-14
CH331891A CH686501A5 (de) 1991-11-14 1991-11-14 Dispositif de contrale du registre dans une machine a imprimer rotative.

Publications (2)

Publication Number Publication Date
EP0541990A1 EP0541990A1 (de) 1993-05-19
EP0541990B1 true EP0541990B1 (de) 1996-03-20

Family

ID=4253398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117794A Expired - Lifetime EP0541990B1 (de) 1991-11-14 1992-10-19 Registerregelung in einer rotierenden Druckmaschine

Country Status (9)

Country Link
US (1) US5329466A (de)
EP (1) EP0541990B1 (de)
JP (1) JPH0742041B2 (de)
AT (1) ATE135635T1 (de)
CA (1) CA2082717C (de)
CH (1) CH686501A5 (de)
DE (1) DE69209233T2 (de)
DK (1) DK0541990T3 (de)
ES (1) ES2084239T3 (de)

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IT1277101B1 (it) * 1995-12-19 1997-11-04 Viero Srl Macchina di stampa a tappeto rotante comprendente un dispositivo di posizionamento con sensore ottico lineare
NL1004663C2 (nl) * 1996-12-02 1998-06-03 Q I Press Controls V O F Werkwijze en inrichting voor het controleren van drukwerk.
GB2326615A (en) * 1997-06-27 1998-12-30 Tecscan Electronics Limited Print monitoring
US6170747B1 (en) 1997-08-29 2001-01-09 Jacob P. Meyer Apparatus for inspecting print quality of barcodes on a high speed moving web
US6059705A (en) * 1997-10-17 2000-05-09 United Container Machinery, Inc. Method and apparatus for registering processing heads
GB0023223D0 (en) * 2000-09-21 2000-11-01 Rue De Int Ltd Document handling apparatus
CH694184A5 (fr) 2000-12-27 2004-08-31 Bobst Sa Dispositif de lecture de marques de rep'rage dans une machine d'impression polychrome.
US7253929B2 (en) * 2002-02-06 2007-08-07 Quad/Tech, Inc. Camera assembly for a printing press
US20030147090A1 (en) * 2002-02-06 2003-08-07 Quad/Tech, Inc. Camera assembly for a printing press
US7423280B2 (en) 2004-08-09 2008-09-09 Quad/Tech, Inc. Web inspection module including contact image sensors
US8274717B2 (en) * 2006-08-01 2012-09-25 Xerox Corporation System and method for characterizing color separation misregistration
US7894109B2 (en) 2006-08-01 2011-02-22 Xerox Corporation System and method for characterizing spatial variance of color separation misregistration
US8270049B2 (en) 2006-08-01 2012-09-18 Xerox Corporation System and method for high resolution characterization of spatial variance of color separation misregistration
US7826095B2 (en) * 2007-01-16 2010-11-02 Xerox Corporation System and method for estimating color separation misregistration utilizing frequency-shifted halftone patterns that form a moiré pattern
US8228559B2 (en) * 2007-05-21 2012-07-24 Xerox Corporation System and method for characterizing color separation misregistration utilizing a broadband multi-channel scanning module
US7630672B2 (en) * 2007-05-21 2009-12-08 Xerox Corporation System and method for determining and correcting color separation registration errors in a multi-color printing system
EP2391509A4 (de) * 2009-01-16 2012-08-22 Ecoaxis Systems Pvt Ltd System zur automatischen registerregelung mit intelligentem optischen sensor und trockenvoreinstellungseinrichtung
DE202013101851U1 (de) * 2013-04-29 2014-07-30 Eltromat Gmbh Anordnung zur Aufnahme eine Bildes von einer Bedruckstoffbahn

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EP0123305A3 (de) * 1983-04-25 1985-10-30 Quad/Tech, Inc. Einrichtung zur Registerregelung für Druckmaschinen
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Also Published As

Publication number Publication date
EP0541990A1 (de) 1993-05-19
JPH05294551A (ja) 1993-11-09
CH686501A5 (de) 1996-04-15
CA2082717A1 (en) 1993-05-15
JPH0742041B2 (ja) 1995-05-10
DE69209233T2 (de) 1996-09-05
ATE135635T1 (de) 1996-04-15
CA2082717C (en) 1997-02-18
US5329466A (en) 1994-07-12
ES2084239T3 (es) 1996-05-01
DK0541990T3 (da) 1996-08-05
DE69209233D1 (de) 1996-04-25

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