EP0782921B1 - Druckmaschine mit rotierendem Band und Positioniereinrichtung mit linearem optischen Sensor - Google Patents

Druckmaschine mit rotierendem Band und Positioniereinrichtung mit linearem optischen Sensor Download PDF

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Publication number
EP0782921B1
EP0782921B1 EP96203586A EP96203586A EP0782921B1 EP 0782921 B1 EP0782921 B1 EP 0782921B1 EP 96203586 A EP96203586 A EP 96203586A EP 96203586 A EP96203586 A EP 96203586A EP 0782921 B1 EP0782921 B1 EP 0782921B1
Authority
EP
European Patent Office
Prior art keywords
belt
sensor
marks
machine
control device
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
EP96203586A
Other languages
English (en)
French (fr)
Other versions
EP0782921A1 (de
Inventor
Giorgio Sacchi
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.)
VIERO Srl
Original Assignee
VIERO Srl
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Filing date
Publication date
Application filed by VIERO Srl filed Critical VIERO Srl
Publication of EP0782921A1 publication Critical patent/EP0782921A1/de
Application granted granted Critical
Publication of EP0782921B1 publication Critical patent/EP0782921B1/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
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/12—Machines with auxiliary equipment, e.g. for drying printed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/10—Machines for multicolour printing
    • 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
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/007—Use of printing belts

Definitions

  • the present invention relates to a rotary-belt printing machine.
  • a photoelectric cell of the on-off type detects passage of the edges of the marks to supply an accurate indication of the position of the belt with respect to the printing stations along it so that the belt may position itself accurately under the various printing units.
  • the positioning accuracy which it is desired to secure is very high and on the order of hundredths of a millimeter.
  • the photoelectric cell detects in sequence the relative positions of all the marks so as to have correction parameters for the printing errors and application of marks on the belt.
  • the machine When the machine has to position the belt in a particular position, it identifies the mark nearest the required dimension and moves the photoelectric cell (arranged for this purpose on a powered slide with centesimal precision for traversing along the belt edge) into a position such that reaching the desired belt position corresponds to having the photoelectric cell detection point opposite the edge of the mark.
  • the machine then performs a rapid 'rough' movement so as to take the belt to a few millimeters or fractions thereof from the required position by using as a position sensor an incremental encoder making up part of the belt movement system.
  • the belt is slowly moved until the transition consisting of the edge of the mark moves past the photoelectric cell detection point.
  • the transition detection there is generated a signal which zeroes the position counter of a secondary encoder controlled by a wheel kept in contact with the belt surface.
  • the position indicated by this second encoder corresponds to the deviation from the desired position.
  • the secondary encoder supplies the position error to the control system which drives the belt positioning motor so that the control system can reduce the deviation by successive approximations under the required tolerance.
  • the general purpose of the present invention is to obviate the above mentioned shortcomings by supplying a rotary-belt printing machine in which there is a highly accurate positioning device which however has a simpler structure less subject to failure and errors.
  • a rotary-belt printing machine comprising a powered rotary belt for bringing segments thereof opposite printing stations with there being along one lateral edge of the belt a plurality of position marks, a control device for accurate positioning of the belt receiving signals from an optical sensor arranged near the lateral edge and detecting sequential passage under it of the above mentioned marks with the control device processing the sensor signals as feedback for accurate and correct positioning of the belt and characterized in that the sensor is a linear sensor with detection line arranged parallel to the lateral edge of the belt to detect the position of marks in its field of vision.
  • FIG. 10 With reference to the figure there is shown a diagrammatic top view of a printing machine indicated generally by reference number 10 and having a rotary belt 11 moved by a motor 12 to pass under successive printing stations 13 (only one being shown for simplicity).
  • the various parts for practical production of such a machine are well known to those skilled in the art as are well known the structure and operation of the printing stations. The latter are accordingly not further shown or discussed.
  • a linear optical sensor advantageously of the known charge-coupled device (CCD) type made up of a row of sensitive elements arranged in accordance with the axis parallel to the strip to allow row detection.
  • the sensor is generally indicated by reference number 15 in the figure and has adequate optics to be able to have a linear field of vision greater than the distance between marks so as to ensure that at least one white-black or black-white transition is always inside the field of vision of the sensor.
  • the extension of the field of vision of the sensor longitudinally with respect to the belt is not less than the distance between two leading edges of successive marks.
  • the number of sensitive elements making up the linear sensor must be such as to ensure with the optics selected the desired positioning resolution, e.g centesimal.
  • the typical sensor resolution can be increased electronically by means of ordinary interpolation techniques to achieve the desired resolution.
  • the sensor 15 is connected to a control device or electronic processor 16 (virtually of the prior art) which manages positioning of the belt by means of the motor 12 and an associated position encoder 18.
  • a first quick and rough shift of the belt is ordered while controlling the belt position by means of the encoder 18 until the mark nearest the desired position enters the field of vision of the linear sensor.
  • the belt is moved slowly while using as position feedback the position signal produced by the linear sensor which detects the movement of the edge of the mark in its own field of vision.
  • the sensor detects that the edge of the mark has been taken by successive approximations into the position of the sensor field of vision corresponding to the desired belt position the desired position is achieved.
  • a mark calibration table that is to say a table containing the distances between the marks detected with the same accuracy as the desired belt positioning accuracy.
  • the belt is made to run to bring all the marks sequentially into the field of vision of the linear optical sensor which in this manner measures the relative distance between marks so that the control device 16 can calculate the relative distance between marks and in short their position with respect to a predetermined origin.
  • the result of these calculations is memorized by the control device and used to learn accurately the position of each mark with respect to the desired belt stopping position.
  • the linear sensor 15 is mounted on a powered slide 17 for moving the sensor longitudinally with respect to the belt.
  • the movement is performed upon command of the control device 16 with the same resolution as the desired resolution for belt positioning and with an amplitude permitting for example bringing the sensor to scan at least three consecutive marks.
  • this permits accurate detection of the relative mark position and allows making the sensor run to bring into its field of vision the edges of consecutive marks with the desired positioning accuracy regardless of the accuracy of belt movement by the motor 12.
  • control device 16 can be provided in a distributed manner, that is to say that there could be inserted in an electronic element (e.g. with microprocessor) the management functions of the signal coming from the linear sensor and, in a separate main machine-management processor, the belt movement functions.
  • an electronic element e.g. with microprocessor
  • the management functions of the signal coming from the linear sensor and, in a separate main machine-management processor, the belt movement functions.
  • the electronic element acquires and examines the image detected by the linear sensor as discussed above and sets the transition points corresponding to the edges of marks in the field of vision while if necessary performing electronic interpolation for resolution increase.
  • the main processor interrogates the device at preset frequency, e.g. through interconnected serial lines, to receive the transition information detected during the last acquisition and set the position error and check belt movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Control Of Position Or Direction (AREA)
  • Control Of Conveyors (AREA)
  • Optical Transform (AREA)
  • Handling Of Sheets (AREA)
  • Control Or Security For Electrophotography (AREA)

Claims (7)

  1. Umlaufriemen-Druckmaschine mit einem angetriebenen Umlaufriemen (11) zum Positionieren von Segmenten davon genenüber Druckstationen (13) entlang eines seitlichen Randes des Riemens, wobei eine Vielzahl von Positionsmarkierungen (14) und eine Steuerungsvorrichtung (16) vorliegen, welche den Riemen (11) genau positioniert und Signale von einem optischen Sensor (15) empfängt, der bei dem seitlichen Rand angeordnet ist und das sequentielle Vorbeilaufen der Markierungen (14) unter ihm erfaßt, wobei die Steuerungs-vorrichtung (16) die Signale des Sensors (15) als Rückkopplung für eine korrekte uns genaue Positionierung des Riemens (11) verarbeitet, dadurch gekennzeichnet, daß der Sensor ein linearer Sensor (15) ist, dessen Erfassungslinie parallel zum seitlichen Rand des Riemens (11) angeordnet ist, um die Position der Markierungen (14) in seinem Gesichtsfeld zu erfassen.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß der lineare Sensor (15) ein Gesichtsfeld hat, das nicht kleiner als die Entfernung zwischen dem führenden Rand der beiden aufeinanderfolgenden Markierungen ist.
  3. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß zur Positionierung des Riemens in einer gewünschten Position gegenüber von dem Sensor (15) in einer ersten Annäherungs-phase die Steuerungsvorrichtung (16) zu der gewünschten Position Signale für die Bewegung des Riemens mit einer ersten Geschwindigkeit sendet, bis sie die am nächsten bei der gewünschten Position gelegene Markierung in das Gesichtsfeld des Sensors (15) gebracht hat, und in einer zweiten Phase Signale für die Riemenbewegung mit einer zweiten Geschwindigkeit, die kleiner als die erste ist, bis sie durch sukzessive Approximationen die in dem Gesichtsfeld vorhandene Markierung in eine Position gebracht hat, die dem in der gewünschten Position plazierten Riemen entspricht.
  4. Maschine nach Anspruch 3, dadurch gekennzeichnet, daß sie eine Kodiervorrichtung (18) zum Erfassen der ungefähren Position des Riemens (11) aufweist, wobei die Steuerungs-vorrichtung (16) in einer ersten Phase Riemenposition-Signale von der Kodiervorrichtung (18) empfängt.
  5. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß der Sensor (15) auf einer angetriebenen Gleitschiene (17) befestigt ist, um in einer sich zum seitlichen Rand des Riemens (11) in Längsrichtung erstreckenden Richtung mit Genauigkeit bewegbar zu sein.
  6. Maschine nach Anspruch 5, dadurch gekennzeichnet, daß während der Kalibrierung die Steuerungsvorrichtung (16) Steuerungssignale für die Bewegung der Gleitschiene aussendet, um den Sensor in einer sich zum seitlichen Rand des Riemens (11) in Längsrichtung erstreckenden Richtung zu bewegen und die exakten relativen Positionen der Markierungen zu erfassen un zu speichern.
  7. Maschine nach Anspruch 6, dadurch gekennzeichnet, daß der lineare Sensor ein CCD-Linearsensor ist.
EP96203586A 1995-12-19 1996-12-17 Druckmaschine mit rotierendem Band und Positioniereinrichtung mit linearem optischen Sensor Expired - Lifetime EP0782921B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI952667 1995-12-19
IT95MI002667A IT1277101B1 (it) 1995-12-19 1995-12-19 Macchina di stampa a tappeto rotante comprendente un dispositivo di posizionamento con sensore ottico lineare

Publications (2)

Publication Number Publication Date
EP0782921A1 EP0782921A1 (de) 1997-07-09
EP0782921B1 true EP0782921B1 (de) 1999-03-31

Family

ID=11372744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96203586A Expired - Lifetime EP0782921B1 (de) 1995-12-19 1996-12-17 Druckmaschine mit rotierendem Band und Positioniereinrichtung mit linearem optischen Sensor

Country Status (7)

Country Link
EP (1) EP0782921B1 (de)
KR (1) KR970033844A (de)
AT (1) ATE178267T1 (de)
BR (1) BR9606053A (de)
DE (1) DE69601918T2 (de)
ES (1) ES2129921T3 (de)
IT (1) IT1277101B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2385559A (en) * 2002-01-21 2003-08-27 Saygrove Product Mfg Ltd Apparatus and method for forming a tactile image which can be read by a blind or partially sighted person
ITMO20030022A1 (it) * 2003-02-03 2004-08-04 Comital Spa Metodo ed apparato per decorare oggetti, e semilavorati
JP4353123B2 (ja) * 2005-03-30 2009-10-28 ブラザー工業株式会社 記録装置
KR100904674B1 (ko) * 2005-04-13 2009-07-08 사단법인 한국폴리텍1(로마숫자표기)대학 산학협력단 포장용 인쇄기계의 피치 컨트롤 방법 및 그 시스템
CN102114728B (zh) * 2010-01-01 2014-07-16 如皋市天元服饰印业有限公司 自动平板印花机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2034979T3 (es) * 1986-04-23 1993-04-16 Ms Macchine E Sistemi S.R.L. Maquina para la estampacion mediante marco plano de productos textiles y similares.
IT1222737B (it) * 1987-09-25 1990-09-12 Salvade S A S Off Mec Dispositivo di guida e regolazione del passo di avanzamento nelle macchine operatrici ad avanzamento intermittente in particolare nelle stampatrici automatiche serigrafiche
DE4023329A1 (de) * 1990-07-21 1992-02-06 Polygraph Contacta Gmbh Einrichtung zur kontrolle und steuerung der qualitaet von druckerzeugnissen
DE4024357A1 (de) * 1990-08-01 1992-02-06 E M Mueller Kg Siebdruckmaschine
NL9101176A (nl) * 1991-07-05 1993-02-01 Stork Brabant Bv Zeefdrukinrichting met continue rapportering van roterende sjablonen.
CH686501A5 (de) * 1991-11-14 1996-04-15 Bobst Sa Dispositif de contrale du registre dans une machine a imprimer rotative.

Also Published As

Publication number Publication date
ES2129921T3 (es) 1999-06-16
BR9606053A (pt) 1998-08-25
DE69601918T2 (de) 1999-08-19
KR970033844A (ko) 1997-07-22
ITMI952667A1 (it) 1997-06-19
ATE178267T1 (de) 1999-04-15
ITMI952667A0 (de) 1995-12-19
DE69601918D1 (de) 1999-05-06
IT1277101B1 (it) 1997-11-04
EP0782921A1 (de) 1997-07-09

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