EP1457324B1 - Verfahren und Vorrichtung zum Bedrucken einer Bahn - Google Patents

Verfahren und Vorrichtung zum Bedrucken einer Bahn Download PDF

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Publication number
EP1457324B1
EP1457324B1 EP04002866A EP04002866A EP1457324B1 EP 1457324 B1 EP1457324 B1 EP 1457324B1 EP 04002866 A EP04002866 A EP 04002866A EP 04002866 A EP04002866 A EP 04002866A EP 1457324 B1 EP1457324 B1 EP 1457324B1
Authority
EP
European Patent Office
Prior art keywords
web
printing
cylinder
dependence
printing cylinder
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
EP04002866A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1457324A1 (de
Inventor
Volker Steffen
Helmut Schneider
Matthias Schulz
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.)
Werner Kammann Maschinenfabrik GmbH and Co KG
Original Assignee
Werner Kammann Maschinenfabrik GmbH and Co KG
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 Werner Kammann Maschinenfabrik GmbH and Co KG filed Critical Werner Kammann Maschinenfabrik GmbH and Co KG
Publication of EP1457324A1 publication Critical patent/EP1457324A1/de
Application granted granted Critical
Publication of EP1457324B1 publication Critical patent/EP1457324B1/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
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/04—Conveying or guiding webs through presses or machines intermittently
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/42—Means for tensioning webs

Definitions

  • the invention relates to a method and a device for printing web-like material according to the preamble of claim 1 or that of claim 18.
  • transfer cylinder For printing web material rotary printing machines are used, which can generally be divided into two groups.
  • the diameter of the cylinder transferring the print image to the web hereinafter referred to as "transfer cylinder”
  • transfer cylinder is adjusted to the length of the print image such that the outer printing circumference of the cylinder is one image length or more of such image length plus optionally corresponds to a repeat distance.
  • This transfer cylinder is assigned a impression cylinder, around which the web to be printed is guided. Transfer cylinders and impression cylinders run continuously at a constant speed, so that such printing machines have a very high throughput.
  • the transfer cylinder is designed so that its printing-technically effective peripheral surface can be adapted to different print image lengths without much effort. This can be achieved, for example, in offset printing in that the lateral surface of the transfer cylinder is formed by a rubber blanket, which can be exchanged without difficulty and / or easily adapted to the respective print image length.
  • the transfer cylinders of this group are generally designed so that their lateral surface extends over less than 360 °, so that special precautions must be taken to apply the printed images without spacing or only with a small repeat distance on the web. To do this, the web must be positioned after each work cycle for the following work cycle, so as to enable printing with small distances between the individual print images.
  • EP 0018291 an embodiment in which the printing unit has a drive roller which operates independently of the actual printing unit.
  • the transfer cylinder is formed fully cylindrical, but also for the positioning of the web requires an additional drive means.
  • the invention has for its object to design methods and apparatus of the type described above so that on the one hand in the transition from one print image to another in a short time can be switched to a new image format, with an accurate guidance and positioning of the web to achieve a high Quality of the print images may be possible should.
  • the throughput should at least meet today's usual requirements.
  • the invention which belongs to the second group of the types of printing machines explained in the introduction, can be summarized in that the web is driven in the printing station by the printing cylinder and positioned thereat after each printing operation for the following working cycle, the length of the in the range
  • the web portion of the respective printing station is changed in response to the transport speed and direction to compensate for the difference between the preferably uniform speed at which the web enters the printing station and the transport speed and direction respectively transmitted from the printing cylinder to the web.
  • a reciprocating compensation device is provided whose movements are coordinated with the speed and direction of rotation of the printing cylinder.
  • the blanket in the circumferential direction of the transfer cylinder may be provided with a portion of lesser thickness, which out of contact with the The web remains, with the pressure technically effective circumferential length of the blanket, which comes into contact with the web, is adjusted depending on the length of the printed image. This can be done continuously.
  • the blanket can also be fixed on the lateral surface of the transfer cylinder by means of gluing, wherein its length in the circumferential direction corresponds to the length of the printed image or a multiple thereof.
  • a suitable adhesive it is possible to remove the blanket when changing the format and stick a new blanket on the cylinder.
  • the web may be expedient to cool the web after it has passed the UV lamp. This can be done in a simple manner already during the passage of the printing cylinder, which may be designed for this purpose as a cooling roller. In any case, if possible, the procedure should be such that the web does not undergo any heating due to the UV irradiation, which could lead to unacceptable stretching or shrinkage of the web. This is particularly important if the web is made of plastic and / or several printing stations are arranged one behind the other, through which the web, as usual in multi-color printing, is passed.
  • Fig. 1 illustrated printing machine (10) is used for printing web-like material (12), which withdrawn from a first roller (14) and in the direction indicated by the arrow (16) general transport direction by four in this transport direction (16) successively arranged printing stations I - IV is guided, which have substantially the same structure.
  • the web (12) is wound on a second roller (18).
  • Each printing station (I-IV) is provided with a printing unit (20) and the means for transporting, positioning and guiding the web to be printed (12) in the region of the respective printing station.
  • the web runs at a constant feed rate V 1 in the respective printing station.
  • the printing stations are designed as roller printing units, whereas in Fig. 2 illustrated printing unit is designed as a short printing unit. Both types of printing unit are applicable and incidentally familiar to those skilled in the art, so that they are not explained in detail here.
  • Each printing unit is provided with a transfer cylinder (22) which has a substantially cylindrical base body (24) and a releasably mounted support for the print image to be transferred from the transfer cylinder (22) to the web (12).
  • the carrier is a blanket, namely a blanket, so the transfer cylinder hereinafter referred to as blanket cylinder (see. Fig. 4 ), referred to as.
  • the blanket cylinder (22) is associated with a printing cylinder (26) to which the web to be printed (12) via a compensation device (28) is supplied.
  • the latter has a non-driven roller (30), which is supported by a carriage (34) which is arranged in the direction of the arrows (36, 38) linearly back and forth.
  • the web (12) is formed over the roll (30) to form a first loop (39) having two parallel web sections and another, likewise non-driven, but stationary roll (42) over which the web moves in the direction of the web Pressure cylinder (26) is deflected, fed to the printing unit, in which the guided by the printing cylinder web with the lateral surface of the blanket cylinder for the purpose of transferring the printed image comes into contact with the web.
  • the web (12) runs out of the printing station (10) to form a second loop (41) via a second roller (32) of the compensation device (28) and a further stationary deflection roller (44)
  • Running direction (16) behind the second compensating roller (32) again has a constant pull-out speed V 1 , which is equal to the feed speed V 1 in front of the stationary guide roller (40), which is arranged in front of the first roller (30) of the compensation device (28).
  • the blanket cylinder (22) has a cutout (48) in which two conventional clamping devices (49) (49) ( Fig. 4 ) are arranged, on each of which one end of the blanket (50) is fixed so that it is stretched over the circular-arc-shaped peripheral portion of the blanket cylinder (22) and insofar forms its lateral surface.
  • two conventional clamping devices (49) (49) Fig. 4
  • one end of the blanket (50) is fixed so that it is stretched over the circular-arc-shaped peripheral portion of the blanket cylinder (22) and insofar forms its lateral surface.
  • the embodiment shown in the drawing extends the lateral surface forming and in one revolution of the blanket cylinder (22) in contact with the on the impression cylinder (26) out Web (12) coming and thus printing effective portion of the blanket (50) over about 280 °, this corresponds to the largest possible print image length, because the blanket (50) has the largest printing technology length in the circumferential direction, which is a difference between a circumference of 360 ° and the peripheral portion of the cutout (48) represents.
  • the blanket (50) in its supported by the circular arc-shaped peripheral portion of the blanket cylinder area with a longitudinal Partial section (52) to provide lesser thickness, as in Fig. 4 is shown, wherein only the longitudinal portion (51), which has a normal thickness, is effective in terms of printing technology, so comes into contact with the web (12).
  • the portion of lesser thickness (52) does not come into contact with the web (12) guided over the printing cylinder (26) during rotation of the blanket cylinder (22) and is thus ineffective in printing technology.
  • the adaptation of the blanket cylinder (22) to the respective print image length is carried out by appropriate selection or adjustment of the blanket (50).
  • the blanket (50) When changing the print image, for example, of a length according to the embodiment of Figs. 3A to 3C to a shorter length according to the embodiment of Fig. 4
  • another blanket could be mounted, which is provided with a correspondingly sized portion (52) of lesser thickness.
  • a blanket which has the maximum possible length in the circumferential direction for the contact with the web (12) required thickness, but also in one piece with an additional section, z. B. with the thickness of the portion (52) of Fig. 4 is in any case out of contact with the web (12), wherein such a blanket according to the respective printing requirements according to the blanket cylinder (22) is to be installed and adjusted.
  • the printing blanket is arranged so that a part of its lesser thickness section is located on the surface of the blanket cylinder (22) such that the blanket (50) turns out of contact with the web (14) in one circumferential area of the blanket cylinder (22). which corresponds to the sum of the arcuate portion of the cutout (48) and the arcuate portion of the blanket portion (52) of lesser thickness.
  • the portion (52) of lesser thickness of the blanket is arranged in the direction of rotation (54) behind the cutout (48) following it.
  • Fig. 3B shows an intermediate stage during the printing process, in the course of which a printed image is applied to the web (12) which is approximately the length of the circumference of the blanket cylinder (22) minus the peripheral portion which corresponds to the cutout (48).
  • the transfer of the respective print image is completed and the blanket (50) out of contact with the web (14), that is about the position according to Fig. 3C
  • the controlled according to a program drive the printing cylinder is controlled such that initially the rotation in the direction of arrow (56) delayed and after reaching the value zero, a rotation of the printing cylinder (26) in the opposite direction, ie in the direction of the arrow (58) takes place, so that the web (12), which is out of contact with the blanket cylinder during this phase, between the impression cylinder (26) and the guide roller (30) runs in the opposite direction.
  • the rotation of the printing cylinder in the direction of the arrow (58) is retarded to zero, in order immediately thereafter to rotate the impression cylinder (26) back in the direction of the arrow (56) let and bring to the rotational speed which corresponds to the peripheral speed of the blanket cylinder (22).
  • This rotational speed of the printing cylinder (26) in the direction of the arrow (56) is reached at the latest by the time in which the blanket (50) of the cylinder (22) for applying the next printed image according to Fig. 3A comes back in contact with the train (12).
  • the above-described sequence of rotational movements of the printing cylinder (26) correspond to the linear movements of the compensation carriage (34).
  • the carriage (34) controlled with respect to its movements is moved with the two freely rotatable rollers (30, 32) in the direction of the arrow (38) so as to assist at the speed V 1 continuously fed web (12) to shorten the distance between the compensation roller (30) and the guide roller (42), whereby additional sheet material in the area between the compensation roller (30) and counter-pressure roller (26) is made available to an increase in the web speed in the region between the roller (30) and the impression cylinder (26) to eg 35 m / min comes and thus the resulting speed of the web (12) of the printing speed, ie the peripheral speed of the two cylinders (18 and 26) equivalent.
  • the movement of the compensation slide in the direction of the arrow (38) also takes place during the printing process at a constant speed V 3 .
  • the carriage (34) in accordance with the now beginning delay of the rotation of the printing cylinder (26) in the direction of the arrow (56 ) is moved in the direction of the arrow (38) at a corresponding decreasing speed until the speed of the web (12) between deflection roller (42) and pressure cylinder (26) becomes smaller than the speed V 1 with which the path of the compensation roller (30) is supplied.
  • the carriage (34) is displaced in the direction of the arrow (36), the speed of the carriage (34) in this direction decreasing the rotational speed of the printing cylinder (26) in the direction of the arrow (56) and then reversing the rotation correspondingly increases in the direction of the arrow (58).
  • the execution of the next cycle presupposes that the rotation of the printing cylinder 26 in the direction of the arrow 58 and the corresponding counter-movement of the web 12 are brought to zero by a correspondingly programmed deceleration, and then the impression cylinder is returned in the direction of of the arrow (56) is accelerated to the printing speed with simultaneous entrainment of the web (12), wherein the compensation carriage (34) performs corresponding movements - during the deceleration phase a movement with decreasing speed in the direction of the arrow (36) and during the subsequent acceleration in Counter direction (56) a movement in the direction of the arrow (38). The latter occurs when the speed of the web (12) is greater than the speed V 1 at which the web is fed.
  • This movement in the direction of the arrow (38) takes place, as already mentioned, at a substantially constant speed as soon as the web (12) has been brought to the speed required for printing, which corresponds to the circumferential speed of blanket cylinder (22) and impression cylinder (26) ,
  • impression cylinder (26) and compensation slide (34) have the function, the web (12) position so that, in spite of the presence of the cutout (48) and optionally the portion of lesser thickness (52) of the blanket (50), the printed images to be applied sequentially on the web (12) are in close contact with each other or optionally with a small clearance can be applied to each other, which is substantially smaller than the path length in radians, during which the blanket cylinder (22) or the blanket (50) out of contact with the web (12).
  • the blanket cylinder (22) or its blanket (50) during the entire rotation of the position according to Fig. 3A - Start of printing - up to the position according to Fig. 3C - End of the printing process - is in contact with the web (12), is for the positioning of the web (12) only the time available to the blanket cylinder (22) needed to move in the direction of the arrow (54) in the course of rotation from the position according to Fig. 3C in those according to Fig. 3A from which the next working cycle begins.
  • the period during which the blanket cylinder (22) is not in contact with the web corresponds to a longer circumferential distance than in one embodiment according to the Figs. 3A to 3C since the contact between the blanket cylinder (22) and the web (12) is terminated at the moment in which the step (60) ( Fig. 4 ) separating the two regions of different thickness of the blanket (50), passes the location of the printing cylinder (26) at which the blanket is normally in contact with the web (12).
  • a constant duration of a working cycle irrespective of the length of the printed image to be applied, that is, a constant rotational speed of the blanket cylinder independent of the print image length, has the consequence that the speed V 1 at which the web (12) is introduced into the respective printing station is higher at a greater length of the printed image than the smaller length of the same, since the supplied per unit time web length is greater for a longer print image than for a shorter print image.
  • the angle at which the web (14) wraps around the impression cylinder (26) should not fall below a certain minimum size, so as to slip avoid and achieve the highest possible accuracy of movement of the web (14) relative to the blanket cylinder (22).
  • the size of the required wrap angle which is about 180 ° in the illustrated embodiments, can be determined at any time by appropriate experiments.
  • the maintenance of a constant web tension is essential. Consequently, it is possible to proceed in such a way that the web tension is preferably measured continuously and, when deviating from a desired value, the drive of the compensation carriage is influenced, for example, by small control steps in such a way that the setpoint voltage is restored. Influencing the speed of the compensation carriage as a function of the web tension could superimpose the program according to which the movement of the carriage is controlled. However, it is very small in size, and will normally be substantially the same in terms of the speed and direction of movement of the web with the parameters provided by the program.
  • the blanket cylinder (22) can also be moved so that the web (12) is provided with markings, which are detected by at least one photocell (62), and the drive for the Pressure cylinder (26) is controlled or regulated in response to the position defined by the registration mark position of the web.
  • This may optionally be done in addition to a drive controlling program.
  • the influencing of the rotational speed of the blanket cylinder caused by such control steps is so small that the deviation possibly caused thereby from the predetermined constant rotational speed of the blanket cylinder with respect to the duration of the working cycle is negligible.
  • a device (64) is assigned to the printing cylinder (26) ( Fig. 2 ), by means of which the printed web is exposed to irradiation by UV light. This ensures that the ink is substantially dry when the web (12) from the printing cylinder (26) expires. In this way, it is possible to deflect the web (12) in the direction shortly behind the driving pressure cylinder (26) via the compensation roller (32) to obtain the shortest possible railway lines.
  • the printing cylinder (26) is provided with at least one cooling channel (66) through which a cooling medium, for example water, flows.
  • a cooling medium for example water
  • the cooling of the web avoids unacceptable shrinkage and / or stretching caused by heating of the web, which could also affect the accuracy with which the web is aligned with the blanket cylinder.
  • the cooling of the web in order to avoid undue heating may be particularly important if, as in the embodiment according to Fig. 1 ,
  • the web is passed through several successively arranged printing stations, each of which is provided with a UV lamp.
  • the cooling may also be effected by other means, for example by a cooling air flow being blown against the printed web.
  • this may also be a partial print image in the sense that a plurality of partial print images are applied to the web at the same location in order to produce an overall print image as is the case with multi-color printing, for example.
  • the invention is explained above essentially in connection with the offset method, the invention is also applicable to other printing and decoration methods.
  • the invention can also be used in high-pressure printing, for example flexographic printing and gravure printing and in rotary screen printing, but also in embossing, in particular hot embossing, without the above enumeration being complete.
  • the web to be decorated is to be positioned in one phase of a work cycle so that the successive applied print images have no or only a small distance from each other, the adjustment to different image lengths preferably by appropriate adjustment of the feed speed V 1 .
  • the transfer cylinder regardless of the print image length in its pressure-technically effective lateral surface have a constant diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
EP04002866A 2003-03-14 2004-02-10 Verfahren und Vorrichtung zum Bedrucken einer Bahn Expired - Lifetime EP1457324B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10311219 2003-03-14
DE10311219A DE10311219A1 (de) 2003-03-14 2003-03-14 Verfahren und Vorrichtung zum Bedrucken einer Bahn

Publications (2)

Publication Number Publication Date
EP1457324A1 EP1457324A1 (de) 2004-09-15
EP1457324B1 true EP1457324B1 (de) 2010-04-07

Family

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Family Applications (1)

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EP04002866A Expired - Lifetime EP1457324B1 (de) 2003-03-14 2004-02-10 Verfahren und Vorrichtung zum Bedrucken einer Bahn

Country Status (6)

Country Link
US (2) US7017486B2 (zh)
EP (1) EP1457324B1 (zh)
JP (1) JP2004276616A (zh)
CN (1) CN100346966C (zh)
DE (2) DE10311219A1 (zh)
TW (1) TWI264374B (zh)

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DE10311219A1 (de) 2004-09-30
US7017486B2 (en) 2006-03-28
TWI264374B (en) 2006-10-21
US20040177779A1 (en) 2004-09-16
CN100346966C (zh) 2007-11-07
TW200422191A (en) 2004-11-01
DE502004010985D1 (de) 2010-05-20
JP2004276616A (ja) 2004-10-07
CN1530218A (zh) 2004-09-22
EP1457324A1 (de) 2004-09-15
US20060185538A1 (en) 2006-08-24

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