EP0567746B1 - Dispositif pour fixer des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer, en particulier une machine pour imprimer des feuilles en offset - Google Patents

Dispositif pour fixer des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer, en particulier une machine pour imprimer des feuilles en offset Download PDF

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Publication number
EP0567746B1
EP0567746B1 EP93103813A EP93103813A EP0567746B1 EP 0567746 B1 EP0567746 B1 EP 0567746B1 EP 93103813 A EP93103813 A EP 93103813A EP 93103813 A EP93103813 A EP 93103813A EP 0567746 B1 EP0567746 B1 EP 0567746B1
Authority
EP
European Patent Office
Prior art keywords
bending
plate cylinder
printing
bar
plate
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
EP93103813A
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German (de)
English (en)
Other versions
EP0567746A1 (fr
Inventor
Georg Hartung
Helmut Schild
Manfred Herold
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0567746A1 publication Critical patent/EP0567746A1/fr
Application granted granted Critical
Publication of EP0567746B1 publication Critical patent/EP0567746B1/fr
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
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206—Feeding to or removing from the forme cylinder

Definitions

  • the invention relates to a device for mounting printing plates on the plate cylinder of printing machines according to the preamble of claim 1.
  • a printing plate is attached to the plate cylinder by means of tensioning rails arranged in a cylinder channel and assigned to the printing start and the printing end, for which purpose the printing start of the printing plate is inserted (clamped) into the corresponding tensioning rail and then the printing end is also clamped in the second tensioning rail and then under Force is tensioned.
  • the plate cylinder is first rotated into a position in which the tensioning rail assigned to the start of printing is easily accessible and the printing plate can be inserted into it with an edge. After clamping the start of the print, the plate cylinder is slowly rotated forward until the print end clamping rail is also easily accessible and the trailing end of the printing plate can be inserted into this printing end clamping rail.
  • DE 3 940 795 C2 From DE 3 940 795 C2, DE 3 940 796 C2 and EP 0 431 575 A2 systems for automatic printing plate change are known, in which the feeding and mounting of a new printing plate on the plate cylinder takes place automatically. In addition to storage and receiving areas for the printing plates, these systems also have transport devices for feeding the new printing plates. These feed systems include on the outer circumference of the plate cylinder to or from this pressure rollers, which should in particular after appropriate positioning of the plate cylinder to insert the printing end of the printing plate into the corresponding tensioning rail.
  • the pressure roller according to EP 0 431 575 A2 is arranged on the pivotable end of a printing plate magazine which can be set on the plate cylinder and is therefore unable to exert sufficient pressing forces of the printing plate on the outer circumference of the plate cylinder due to the lever ratios recognizable in this document.
  • Another pressure roller is only used to insert the bent printing end of the printing plate into the tensioning rail.
  • the pressure roller provided jointly in the two German patents serves, in particular, to place the non-folded end of the pressure plate on an open tensioning rail, so that this end can be fastened by closing a clamping flap.
  • the plate cylinder must be moved with respect to the pressure roller into a position in which the pressure roller can only partially and thus incompletely press the pressure plate against the plate cylinder.
  • the tightening torque exerted by this pressure roller on the pressure plate during the pulling-up process when the plate cylinder rotates forward can thus be lost again in this phase.
  • the object of the present invention is therefore a device for mounting printing plates on the plate cylinder of To improve printing machines according to the preamble of claim 1 such that it is possible to open and insert non-folded printing plates in a printing end clamping rail with a sufficiently high elevator torque.
  • an actuatable folding bar is assigned to a known pressure roller.
  • the pressure roller (adjustable and removable) presses a new printing plate against the outer circumference of the plate cylinder during the slow forward rotation of the plate cylinder.
  • the pinch roller corresponds to the area of the printing end of the plate cylinder, the forward rotation stops.
  • the folding bar is now actuated so that the printing plate is bent over the entire format width around the edge of the plate cylinder located beyond the printing end and comes to rest with its end edge on a stop of the rear tensioning rail.
  • the trailing end of the pressure plate can now be gripped by the opened tensioning rail, which can be done, for example, by closing an open clamping flap, by moving a circumferentially adjustable tensioning rail or by swiveling forward an appropriately mounted tensioning rail.
  • the entire mounting process for a new printing plate takes place with the blanket cylinder parked by the plate cylinder.
  • the entire elevator torque for the new pressure plate is thus caused exclusively by the pressure roller, which has a rubber coating, for example.
  • the printing plate Due to the foldable strip, which, like the pressure roller, also extends and can be actuated across the format width of the printing plate, the printing plate is bent during the mounting process. A new pressure plate does not have to be opened with a special device. Since the bending of the printing plate takes place on the plate cylinder, the circumferential aspect ratios of the plate cylinder are taken into account precisely. Printing plates that have already been used can easily be mounted by the device according to the invention.
  • the device for mounting printing plates on the plate cylinder of printing machines according to the invention can be used both in fully automatic printing plate changing systems, as stated in the introduction, and in semi-automatic devices for changing printing plates.
  • devices of the latter type there are no storage chambers or conveying devices for the new or old printing plates, but these processes are carried out by hand. With such devices, only the opening and closing of the tensioning rails, the tensioning of the printing plate via the printing end tensioning rail and the corresponding positioning processes of the plate cylinder can be carried out automatically.
  • 1 to 4 each show a plate cylinder 1, in the cylinder pit 2 of which a front and rear clamping rail 3, 4 assigned to the printing start DA and the printing end DE is arranged.
  • the front clamping rail 3 consists of an upper and a lower clamping rail, the lower clamping rail being movable relative to the upper clamping rail for opening or closing a detection area provided for the pressure plate 5.
  • the rear tensioning rail 4 also consists of an upper and a lower clamping rail, the lower clamping rail also being movable relative to the upper one, and the printing end of a printing plate thereby being insertable between these parts.
  • the rear tensioning rail 4 is also pivotally arranged in the cylinder pit 2, the position shown corresponding to a fully open position of the tensioning rail 4.
  • the plate cylinder 1 is in a position in which a pressure plate 5 can be inserted into the open front clamping rail 3.
  • the pressure roller 6 now runs over the outer contour of the tensioning rail 3 and now presses the pressure plate 5 against its outer circumference during further rotation (FIG. 2).
  • the forward rotation of the plate cylinder 1 is continued by correspondingly controlling the printing unit drive until the pressure roller 6 comes to rest in a region of the printing end DE of the plate cylinder 1.
  • the trailing end of the mounted pressure plate 5 thus protrudes almost in the tangential direction (Fig. 3).
  • a folding bar 8 extending parallel to its axis and also extending over the format width of the plate cylinder 1, which is described by a storage described in more detail below and an actuating device can be moved from a position according to FIGS. 1 to 3 into a position for folding the trailing end of the pressure plate 5 (FIG. 4).
  • the attachment and storage of the folding bar 8 relative to the pressure roller 6 or its bearing lever 7 is such that the pressure plate 5 held by the pressure roller 6 in the area of the printing end DE is bent exactly around a bevel 9 of the plate cylinder 1 located beyond the printing end DE (Fig. 5).
  • the rear edge of the pressure plate 5 advantageously comes to rest on a correspondingly designed stop surface 10 of the fully open tensioning rail 4 - that is to say in this case the fully pivoted-back tensioning rail 4.
  • the stop surface 10 on the rear clamping rail 4, like the folding strip 8, extends over the entire format width of the plate cylinder 1.
  • FIG. 5 the bearing of the pressure roller 6 and the folding bar 8 is shown again in more detail along with their profile having a curvature in the area of action (the relevant representations in FIGS. 1 to 4 are only to be understood in principle).
  • the pressure roller 6 can be rotated on both side frame walls 12 of the printing press (not shown) at one end of a respective bearing lever 7 attached.
  • the frame-side pivot axis of the bearing lever 7 can be formed, for example, by a crossmember 11, to which the anti-run-in protection, not shown here, is also attached between the plate cylinder 1 and the blanket cylinder, not shown (FIGS. 5 and 7).
  • the pressure roller 6 is rotatably mounted on this axis 13.
  • the pressure roller 6 is advantageously divided into individual sections, each section consisting of a cylindrical sleeve 14, each of which is mounted on the axle 13 via a pair of radial bearings 15 (e.g. needle bearings).
  • the sleeves 14 have, for example, a rubber-like coating which has a hardness of, for example, 50 Shore / A.
  • the sectioning of the pressure roller 6 into individual sleeves 14 results in a degree of deflection compensation of the pressure roller 6 with respect to the plate cylinder 1.
  • a deflection compensation of the pressure roller 6, especially in large-format machines, can also be done in a simple manner by means of a correspondingly pre-bent axis 13, also with segmentation the pressure roller 6 take place. Further measures for deflection compensation can also be provided.
  • the folding bar 8 is mounted above the fastening area of the axis 13 via a slot 16 and a screw 17 so as to be movable with respect to the bearing levers 7.
  • the direction of extension of the elongated hole 16 corresponds to the mobility of the folding bar 8 with respect to the plate cylinder 1 as shown in FIGS. 4, 5.
  • the spring bar 8 can always be pressed into a parked starting position with respect to the bearing levers 7 by spring means (not shown). This position corresponds to the positions of the folding bar 8 in FIGS. 1 to 3.
  • the bending bar 8 can also be pre-bent for deflection compensation in the direction of extension or curved accordingly with its front edge.
  • the folding bar 8 can also have a profile that prevents deflection.
  • the piston rods are articulated, for example, by double-acting, pressurized air cylinders to turn the pressure roller 6 on and off.
  • the pressure roller 6 can thus be pivoted from the positions shown in dashed lines in FIGS. 1 and 5 (turned off) into the employed position.
  • the force ratios of the working cylinders and the lever ratios of the articulation on the bearing levers 7 are such that the pressure roller 6 experiences the desired pressure force of the pressure plate 5 with respect to the plate cylinder 1. So that the pressure roller 6 is not immersed in the cylinder pit 2 of the plate cylinder 1 (position of the plate cylinder 1 as in FIG. 1), stops can be provided on the bearing levers 7, which are supported on the bearer rings of the plate cylinder 1 (not shown). To avoid damaging the surfaces of the bearer rings 7 appropriate stops with e.g. Polyamide may be provided.
  • a double-acting, pressurized air cylinder 19 is arranged on each of the two side frame walls 12, the piston rod of which is articulated on one arm of an angled double lever 20.
  • the double levers 20 are each pivoted about a hinge pin 21.
  • the free ends of the double lever 20 each have a roller 22, via which the double lever 20 can act on the folding bar 8.
  • the angulation of the double lever 20 and the attachment of the hinge pin 21 is included chosen such that the folding bar 8 is pushed forward when the pressure roller 6 is engaged when switching the working cylinder 19 via the rollers 22 from the initial position (spring force) into the position provided for folding the pressure plate 5 (FIGS. 5 and 6).
  • the folding bar 8 reaches its starting position again.
  • the double lever 20 is pivoted back by such an angular amount that the folding bar 8 does not experience any hindrance when the pressure roller 6 is switched off by the roller 22 (the basic position of the double lever 20 is shown in broken lines in FIG. 6).
  • the folding bar 8 shows a particularly advantageous profile for the folding strip according to the invention.
  • the folding bar 8 here has the arcuate profile of a pipe section which is rotatably mounted about the axis 13 of the pressure roller 6 by a certain angle (arrow). Due to this profile, the folding bar 8 (its end acting on the pressure plate 5) can be attached very close to the pressure roller 6 and also has a very high deflection stiffness.
  • a folding bar 8 configured in this way is rotatably supported at least at its ends about the axis 13 by means of arms (not shown) and, as indicated above, is actuated by the double lever 20 in the pivoted-on state of the pressure roller 6.
  • Another advantage of such profiling is the protective function for the pressure roller 6 when the folding bar is pivoted back.
  • the folding bar 8 shown in profile in FIG. 8 can be rotatably supported about the axis 13 by means of more than two arms attached to the ends, each of which is guided in the area of the axially spaced sleeves 14 of the pressure roller 6 to the axis 13 (cf. Fig. 7).
  • Such multiple storage of the folding bar 8 with respect to the axis 13 results in an increase in the bending stiffness of the pressure roller 6.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)

Claims (14)

  1. Dispositif pour monter des plaques d'impression (5) sur le cylindre porte-plaque (1) de machines d'impression, en particulier des machines d'impression offset à feuilles, dans lequel une plaque d'impression (5) pouvant être fixée avec la zone (DA) de début d'impression sur un rail tendeur agencé dans le canal (2) du cylindre porte-plaque (1) peut être montée autour de la périphérie externe du cylindre porte-plaque (1), pour un cylindre porte-plaque (1) tournant vers l'avant, par un galet de pressage (6) pouvant être mis en contact de celui-ci, et ensuite l'extrémité de fuite de la plaque d'impression (5) peut être amenée à un rail tendeur pour être fixée à ce dernier qui est associé à la fin d'impression (DE),
    caractérisé en ce que, dans le sens de rotation du cylindre porte-plaque (1), une tige plieuse (8) est agencée en amont du galet de pressage (6), parallèlement à celui-ci, tige plieuse qui peut être réglée, par l'intermédiaire d'un dispositif d'actionnement (18), sur le cylindre porte-plaque (1) pouvant se déplacer dans une position angulaire déterminée de sorte que la plaque d'impression (5) peut être cintrée autour d'un pli (9) de la fin d'impression (DE) du cylindre porte-plaque (1).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que la tige plieuse (8) est agencée de façon mobile, transversalement à sa direction d'extension, aux extrémités pivotantes de leviers de palier (7) portant des deux côtés les galets de pressage (6).
  3. Dispositif selon la revendication 2,
    caractérisé en ce que le dispositif d'actionnement (18) est fixé au bâti et est formé de manière à agir sur la tige plieuse (8), uniquement pour un galet de pressage (6) en contact.
  4. Dispositif selon la revendication 3,
    caractérisé en ce qu'un dispositif d'actionnement (18) est à chaque fois agencé aux deux parois de bâti latérales (12) portant le cylindre porte-plaque (1), par lesquels on peut agir à chaque fois sur une extrémité de la tige plieuse (8).
  5. Dispositif selon l'une des revendications 2, 3 ou 4,
    caractérisé en ce que le dispositif d'actionnement (18) comporte un vérin de travail (19) supporté par la machine et agissant sur un bras d'un levier double (20) monté autour d'un axe fixé au bâti, et en ce que la tige plieuse (8) peut être actionnée par l'intermédiaire du bras libre du levier double (20).
  6. Dispositif selon la revendication 5,
    caractérisé en ce qu'un galet d'avance (22) agissant sur la tige plieuse (8) est agencé sur le bras libre du levier double (20).
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que la tige plieuse (8) présente un contour cintré avec le profil agissant sur la plaque d'impression (5), ainsi que sur le cylindre porte-plaque (1).
  8. Dispositif selon la revendication 2,
    caractérisé en ce que la tige plieuse (8) présente aux deux extrémités des trous longitudinaux (16), par l'intermédiaire desquels elle est agencée avec des vis (17) de façon mobile sur les leviers de palier (7) du galet de pressage (6).
  9. Dispositif selon l'une des revendications 4, 5 ou 6,
    caractérisé en ce que la tige plieuse (8) est réalisée, dans sa section transversale de profit et/ou par une forme dans sa direction d'extension, pour une compensation de la flexion.
  10. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que la tige plieuse (8) présente un profit cintré d'un tronçon tubulaire et est montée de façon rotative autour du galet de pressage (6).
  11. Dispositif selon la revendication 10,
    caractérisé en ce que la tige plieuse (8) est supportée de façon rotative, sur l'axe (13) du galet de pressage (6), par l'intermédiaire d'au moins deux logements écartés l'un de l'autre dans la direction d'extension de la tige plieuse (8).
  12. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que le galet de pressage (6) est divisé en plusieurs tronçons qui sont montés sous forme de douilles individuelles (14), par l'intermédiaire à chaque fois d'une paire de paliers (15), sur un axe (13) s'étendant entre les deux extrémités pivotantes des deux leviers de palier (7).
  13. Dispositif selon la revendication 12,
    caractérisé en ce que l'axe (13) présente un cintrage convexe orienté en direction du cylindre porte-plaque (1), pour la compensation de la flexion.
  14. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que sur le rail tendeur (4) associé à la fin d'impression (DE) est agencée une surface de butée (10), sur laquelle peut prendre appui l'extrémité de la plaque d'impression (5) cintrée autour du pli (9).
EP93103813A 1992-04-30 1993-03-10 Dispositif pour fixer des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer, en particulier une machine pour imprimer des feuilles en offset Expired - Lifetime EP0567746B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4214207 1992-04-30
DE4214207A DE4214207C1 (fr) 1992-04-30 1992-04-30

Publications (2)

Publication Number Publication Date
EP0567746A1 EP0567746A1 (fr) 1993-11-03
EP0567746B1 true EP0567746B1 (fr) 1995-09-20

Family

ID=6457809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103813A Expired - Lifetime EP0567746B1 (fr) 1992-04-30 1993-03-10 Dispositif pour fixer des plaques d'impression sur le cylindre porte-plaque d'une machine à imprimer, en particulier une machine pour imprimer des feuilles en offset

Country Status (5)

Country Link
US (1) US5309835A (fr)
EP (1) EP0567746B1 (fr)
JP (1) JP2956021B2 (fr)
AT (1) ATE128073T1 (fr)
DE (2) DE4214207C1 (fr)

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DE4420971C1 (de) * 1994-06-16 1995-07-20 Roland Man Druckmasch Verfahren und Vorrichtung zum Aufziehen flexibler Druckformen
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DE19505630A1 (de) * 1995-02-18 1996-08-22 Roland Man Druckmasch Vorrichtung zum Wechseln von Druckplatten
DE19511075A1 (de) * 1995-03-25 1996-09-26 Roland Man Druckmasch Verfahren und Vorrichtung zum Aufziehen flexibler Druckformen
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DE19950605A1 (de) 1999-10-21 2001-04-26 Heidelberger Druckmasch Ag Gummituch mit Registerausnehmungen und Verfahren zur Gummituchausrichtung
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DE10219073A1 (de) * 2001-05-23 2002-11-28 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zum Befestigen einer Druckplatte auf einem Plattenzylinder einer Rotationsdruckmaschine
US6900826B2 (en) * 2002-02-19 2005-05-31 Presstek, Inc. Multiple resolution helical imaging system and method
DE10306492B4 (de) * 2002-03-21 2006-10-19 Heidelberger Druckmaschinen Ag Andrückvorrichtung einer Druck- oder Lackiermaschine
DE10338374A1 (de) * 2003-08-21 2005-03-17 Koenig & Bauer Ag Vorrichtung zum Zuführen von Druckplatten zu einer Druckplattenwechsel-Einrichtung
JP4800148B2 (ja) * 2006-08-11 2011-10-26 三菱重工印刷紙工機械株式会社 版交換装置
DE102017201161B4 (de) 2017-01-25 2024-03-14 Koenig & Bauer Ag Verfahren zum Aufziehen einer Platte auf einen Zylinder einer Druckmaschine und eine Vorrichtung zum Aufziehen einer Platte in einer Druckmaschine

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JPH07110538B2 (ja) * 1987-11-12 1995-11-29 三菱重工業株式会社 刷版自動着脱装置
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DE3940795A1 (de) * 1989-12-09 1991-06-13 Koenig & Bauer Ag Verfahren und einrichtung zum automatischen zufuehren bzw. abfuehren einer druckplatte
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Also Published As

Publication number Publication date
EP0567746A1 (fr) 1993-11-03
US5309835A (en) 1994-05-10
DE4214207C1 (fr) 1993-07-22
DE59300614D1 (de) 1995-10-26
JP2956021B2 (ja) 1999-10-04
ATE128073T1 (de) 1995-10-15
JPH0623953A (ja) 1994-02-01

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