EP0287406B1 - Einrichtung zum Festhalten einer Druckplatte auf einem Plattenzylinder einer Offset-Rotationsdruckmaschine - Google Patents

Einrichtung zum Festhalten einer Druckplatte auf einem Plattenzylinder einer Offset-Rotationsdruckmaschine Download PDF

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Publication number
EP0287406B1
EP0287406B1 EP88400549A EP88400549A EP0287406B1 EP 0287406 B1 EP0287406 B1 EP 0287406B1 EP 88400549 A EP88400549 A EP 88400549A EP 88400549 A EP88400549 A EP 88400549A EP 0287406 B1 EP0287406 B1 EP 0287406B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
plate
link
articulation
slot
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
EP88400549A
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English (en)
French (fr)
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EP0287406A1 (de
Inventor
Jean-Claude Marmin
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.)
Harris Marinoni SA
Original Assignee
Harris Marinoni SA
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Filing date
Publication date
Application filed by Harris Marinoni SA filed Critical Harris Marinoni SA
Publication of EP0287406A1 publication Critical patent/EP0287406A1/de
Application granted granted Critical
Publication of EP0287406B1 publication Critical patent/EP0287406B1/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
    • 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
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/125—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end on a curvilinear path, e.g. by winding on a roll

Definitions

  • the invention relates to a device for holding a printing plate on a plate cylinder in an offset press.
  • the printing support is removable, it is a plate generally made of metal (aluminum, brass or steel) not very thick (2 to 6 tenths of a mm), often an aluminum plate from 3 to 4 tenths of a mm.
  • This plate receives the printer form in the flat state in a frame where it is impressed by photographic exposure through a transparent film carrying the image to be reproduced, which defines on the plate corresponding printing areas.
  • This fixing is sometimes done by magnetic means (if the base of the plate is made of steel), pneumatic (suction through holes made in the cylinder), adhesives (double-sided tape placed between the cylinder and the plate), or mechanical such as jaws but these means are relatively rare, most often a device is used comprising a tension bar of the plate, which makes it possible to tension the latter during assembly and to maintain it in position thereafter.
  • the English patent specification GB-A-1 321 028 describes a device of this kind where the bar is controlled by a mechanism comprising a crank connected to the tension bar, a first link articulated at a first end on the crank, and a second link articulated on the one hand at a second end of the first connecting rod and on the other hand on the plate cylinder.
  • a bore is formed longitudinally in an extension of the second link, so that it engages a rod with which the second link is rotated.
  • a final tension of the plate is preferably produced by varying the length of the first link, which comprises for example a screw-nut assembly making it possible to adjust its effective length.
  • the tension bar is controlled by tangible wheel and screw mechanisms arranged at each end of the bar, the wheel being linked in rotation with the bar while the screw is intended to be actuated by the 'user.
  • the positioning of the plate is done first approximately, after having disengaged the connection between the bar and the wheel-screw mechanisms, then the latter are engaged and the assembly is completed by acting simultaneously on the two screws.
  • the rigid link is set in motion with the operating member, it rotates both around its articulation with the crankshaft and its articulation with the elastic link.
  • These articulations are both liable to move, a displacement of the articulation with the crankshaft corresponding to a rotational movement of the tension bar while a displacement of the articulation with the elastic rod corresponds to a rotation of the latter around its articulation with the cylinder, possibly accompanied by compression or extension of this rod.
  • the stop is placed beyond a point of maximum compression of the elastic link so that the natural tendency of the latter to continue the expansion started at the end of the movement imposes a support against the stop, so that the bar control mechanism is blocked.
  • reverse movement is necessary, i.e. recompress the elastic link by releasing the articulation device from the stop, pass the point of maximum compression, take support on the articulation with the elastic link when it is relaxed to rotate the crank then release the plate.
  • control mechanism according to the invention is simple and convenient to use, it suffices to rotate the rigid link with the operating member. to achieve the tension and then the blocking in the same movement, the two phases of which follow one another automatically, without there being any disengagement or engagement maneuver to be carried out, unlike the prior devices.
  • the mechanism works indeed over a large part of its travel in configurations where the rotational movements of the bar are free, it is only when the plate is stretched or when in the locked position that these movements meet resistance. .
  • you only have to act on one side of the bar to tension the plate then you simply have to block the mechanism on which you are acting by going to the stop then do the same on the mechanism on the other side.
  • To remove the plate we unlock one side then the other, continuing on the latter side the movement, to rotate the bar to a position where we can dismantle the plate.
  • FIGS. 1 to 4 The exemplary embodiment of a device for holding a printing plate on a plate cylinder which is illustrated in the drawings is generally shown in FIGS. 1 to 4.
  • This device comprises a slot 1 formed in the plate cylinder 2, along a generator thereof; a bore 3 made under the lateral surface of the cylinder 2 near the slot 1, into which it opens; a cylindrical tension bar 4, housed in the bore 3, comprising a slot 5 formed along a generator; support discs 6A and 6B for the blanket cylinder with which the cylinder 2 cooperates, located on either side thereof; and mechanisms 7A and 7B for controlling the tension bar 4, arranged on the cylinder outside the support discs, bores being formed in these for the passage of the tension bar.
  • FIG. 1 shows a printing plate 8 in a position where its face 9 is seen intended to be placed opposite the lateral surface of the cylinder 2, the plate being intended to move in the direction shown by the arrow 10
  • the plate 8 is bent at the head according to a fold 11 which delimits a head fold 12, and at the tail according to two parallel folds 13A, 13B delimiting an intermediate fold 14 and a fold tail 15.
  • the head fold 12 is introduced into the slot 1 of the cylinder while the tail fold 15 is introduced into the slot 5 of the tension bar, after having wound the plate on the cylinder, between the support discs 6A and 6B, the plate 8 being tensioned by action on the control mechanisms of the bar 7A and 7B.
  • the invention is not limited to this preferred solution, but that it relates to any plate holding device which has a tension bar which must be rotated to tension the plate and then lock in place. position when the plate is stretched, these devices being quite likely to include a tension bar control mechanism according to the invention.
  • Figures 5 to 8 show the control mechanism 7A of the holding device which is provided with the cylinder 2, the mechanism 7B located on the other side being identical.
  • this mechanism comprises a crank 16 linked in rotation to the tension bar 4, a rigid link 17 articulated at a first end on the crank 16, provided with gripping means 18 for an operating member 19; an elastic link 20 articulated at a first end on a second end of the rigid link 17, and articulated at a second end on the plate cylinder 2; and a support stop 21 for the articulation device between the elastic link 20 and the rigid link 17, arranged in a place such that the axis 52 of this articulation is close to a plane comprising the axis d hinge 53 of the elastic rod 20 on the cylinder 2 and the hinge pin 54 of the rigid rod 17 on the crank pin 16 when the latter is in a position where the plate is stretched on the cylinder; the sum of the empty length of the elastic link 20 and the length of the rigid link 17 being greater than the distance separating these articulation axes 53 and 54 in this plane.
  • the control mechanism is actuated by rotating the rigid link 17 with the operating member 19, as seen in FIGS. 5 to 7.
  • the slot 5 of the tension bar is in the position for introducing the tail fold 15 of the plate (the latter not being shown in FIGS. 5 to 7) and the fold head 12 is anchored in slot 1 (not shown in FIGS. 5 to 7) of cylinder 2.
  • the gripping means 18 are located near the slot 1 of the cylinder, which is very advantageous since it is possible to operate the present tensioning bar control device while the cylinder is angularly in the position for introducing the edge of tail, it is not necessary to rotate the cylinder from this position to be able to access the operating means as was necessary with the prior devices.
  • the angle with which the head edge 12 is folded corresponds substantially to the angle between the lateral surface of the cylinder and the slot 1, and that the angles corresponding to the folds 13A and 13B and the dimension of the intermediate fold 14 are provided to allow the latter to pass easily inside the slot 1 when the plate 8 is stretched by rotating the tension bar 4 clockwise.
  • a chamfer breaks an edge between the slot 5 and the lateral surface of the tension bar 4, to facilitate the introduction of the fold 15 into this slot.
  • the mechanism 7A is sufficient to maintain the bar 4 in the locked position, however it was preferred to provide in this embodiment the mechanism 7B on the other side of the bar, to ensure better support.
  • the support stop 21 is a flat along which the articulation device can slide between the elastic link and the rigid link.
  • the elastic link 20 tends to elongate by sliding its articulation device with the rigid link 17 on the flat 21, this force is transmitted by the rigid link 17 to the crank 16, substantially in the same direction, which tends to rotate the crank (and therefore the bar 4) in the direction of catching up with a possible elongation of the plate (see FIG. 7).
  • the holding device comprises a stop 23 for the crank 16, the latter being placed in a position for placing the plate when it is pressed there (see FIG. 5) .
  • the gripping means 18 are a bore arranged transversely in the rigid link, the operating member 19 being a lever adapted to be introduced into this bore.
  • lever and bore have indeed simple shapes, they are easy to manufacture and convenient to use.
  • this lever and the bore are cylindrical, the bore opens out and a shoulder 24 is provided on the lever to block its progression in the bore.
  • the elastic link 20 is articulated on the cylinder 2 by a yoke 25 mounted on a flat 26 formed in the cylinder, which is advantageously machined at the same time as the stop 21, for example by the same milling.
  • the yoke 25 has a base 27 (see FIG. 8) in which two bores 28A and 28B are provided, provided for mounting screws on the flat 26, two sides 29A and 29B in which openings with rounded bottom 30A and 30B are formed; and two caps 31A and 31B intended to close these openings.
  • the elastic link 20 comprises a rod 32 carrying at a first end a hinge yoke 33, this rod being provided with a stop at this first and at a second end (see below), a slide 34 movable along the rod 32 between said stops, carrying at least one articulation pin, here two pins 35A, 35B; and a spring 36 threaded on this rod 32, between one of said stops and the slide 34; a washer 37 being provided here between the spring 36 and the slide 34 so that their contact is made in good conditions.
  • the yoke 33 carried by the rod 32 at its first end, has a surface 38 which forms the stop which is provided therein, and that provided at the second end of the rod is an elastic ring or circlips 40 carried by a cylindrical nut 39 screwed onto a thread 41 formed on the rod 32, from its second end.
  • the washer 37 is provided with a sleeve 43 whose outer diameter corresponds to the bore 42 formed in the slide 34 and whose inner diameter corresponds to the diameter of the rod.
  • the spring brings the annular lateral surface of the sleeve 43 against the nut 39, the latter and the sleeve 33 can slide in the slide between a position where the washer 37 comes against the slide 34 and a position where the ring 40 is supported on the slide.
  • the position of the stop 40 is adjusted along the rod as well as that of the washer 37, that is to say the empty lengths (washer 37 against slide 34 ) and maximum length (stop 40 against slide 34) of the elastic link, as well as the initial compression of the spring 36.
  • the rod 32 slides in the slide (and more precisely in the washer 37) in the direction which corresponds to the shortening of the rod, that is to say where the stop 40 moves away from the slide 34.
  • the stop 40 of the nut 39 released from the slide.
  • the empty length of the link 20 is adjusted so that the sum obtained by adding it to the length of the rigid link 17 is greater than the distance separating the joints 53 and 54 when the crank is in a position where the plate is stretched on the cylinder or, in other words, so that the rods 17 and 20 are articulated in V, empty (see Figure 6).
  • this sum must be sufficiently greater than said distance between the joints 53 and 54 for the link 20 to be compressed when its articulation device with the rigid link is in abutment on the stop 21 (there would be no more blocking if the washer 37 came to bear against the nut 39).
  • the yoke 33 carried by the rod 32 at its first end is articulated on the rigid link thanks to a hinge pin (material) 44 which passes through the bores 45A and 45B of the yoke 33 and in a bore 46 of the rigid link .
  • the slide 34 is articulated on the plate cylinder 2 by the yoke 25, the pins 35A and 35B being mounted in the openings 30A and 30B and held in place by the caps 31A and 31B, the rigid link 17 is articulated on the crankcase 16 by virtue of a hinge (material) axis 47 which passes through the bores 48A and 48B of the crank and the bore 49 of the rigid link 17, and the crank 16 is provided with a square section bore 50 which s threads on a prism 51 with square section which is provided with the end of the shaft 4.
  • the immobilization of the crank on the shaft is ensured by suitable known means not shown, and it is the same for immobilization in translation axes 44 and 47.
  • the mechanisms 7A and 7B are not placed outside the support discs 6A and 6B, but between them, in a groove made in the lateral surface of the cylinder.
  • the mechanisms 7A and 7B are in fact provided to be able to be mounted and maneuvered from above, therefore without difficulty in a grooving.
  • This arrangement of the mechanisms 7A and 7B is in certain cases more advantageous than the arrangement shown, in particular if it is desired to minimize the width of the tension bar 4 and avoid making bores for its passage through the support discs 6A and 6B.

Landscapes

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

Claims (10)

1. Einrichtung zum Festhalten einer Druckplatte auf einem Plattenzylinder (2) einer Offset-Rotationsdruckmaschine, bestehend aus einer Stange (4) zum Spannen der Platte und einem Mechanismus zum Antrieb der Platte, der ein mit der Spannstange verbundenes Kurbelelement (16), einen ersten Arm, der an einem ersten Ende an dem Kurbelelement (16) angelenkt ist, einen zweiten Arm, der einerseits am zweiten Ende des ersten Arms und andererseits an dem Plattenzylinder angelenkt ist, und Angriffseinrichtungen für ein Betätigungsorgan besitzt, dadurch gekennzeichnet, daß in dem Antriebsmechanismus
- der erste Arm (17) starr und der zweite Arm (20) elastisch ist und einen Punkt maximaler Kompression zuläßt, wenn die Gelenkachse (52) zwischen dem starren Arm (17) und dem elastischen Arm (20), die Gelenkachse (53) zwischen dem elastischen Arm (20) und dem Zylinder (2) und die Gelenkachse (54) zwischen dem starren Arm (17) und dem Kurbelelement (16) koplanar sind, wenn das Kurbelelement in einer Stellung ist, in der die Platte auf dem Zylinder gespannt ist,
- die Angriffseinrichtungen (18) für ein Betätigungsorgan (19) an dem starren Arm (17) vorgesehen sind, und
- außerdem ein Anschlag (21) für das Gelenk zwischen dem elastischen Arm (20) und dem starren Arm (17) vorgesehen ist, das an einer solchen Stelle angeordnet ist, daß das Gelenk nach leichter Überschreitung des Punktes maximaler Kompression an ihm zum Anliegen kommt, wenn der Mechanismus zum Spannen der Platte auf dem Zylinder (2) betätigt wird.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Anschlag (21) für das Gelenk (33, 44, 46) zwischen dem elastischen Arm und dem starren Arm eine Abflachung ist, auf der das Gelenk gleiten kann.
3. Einrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß sie einen Anschlag (23) für das Kurbelelement (16) besitzt, das sich in einer Stellung zur Montage der Platte befindet, wenn sie an diesem in Anschlag ist.
4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Angriffseinrichtungen (18) für ein Betätigungsorgan eine in dem starren Arm in Querrichtung vorgesehene Bohrung sind, wobei das Betätigungsorgan (19) ein in diese Bohrung einführbarer Hebel ist.
5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der elastische Arm (20) an dem Zylinder (2) über eine Gabel (25) angelenkt ist, die auf einer in dem Zylinder vorgesehenen Abflachung (26) montiert ist.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der elastische Arm eine Stange (32), die an einem ersten Ende eine Gelenkgabel (33) trägt und an diesem ersten Ende und an einem zweiten Ende mit einem Anschlag (38, 40) versehen ist, ein auf der Stange zwischen den Anschlägen bewegliches Gleitstück (34), das mindestens einen Drehzapfen (35A, 35B) trägt, und eine Feder (36) besitzt, die zwischen einem der Anschläge (38) und dem Gleitstück auf die Stange aufgesteckt ist.
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die von der Stange (32) an ihrem ersten Ende getragene Gabel (33) den an dieser Stelle vorgesehenen Anschlag bildet und daß die Stellung des Anschlags (40) des zweiten Endes auf der Stange verstellbar ist.
8. Einrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die von der Stange (32) an ihrem ersten Ende getragene Gabel (33) am starren Arm (17) angelenkt ist und daß das Gleitstück (34) an dem Plattenzylinder (2) angelenkt ist.
9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß sie einen Schlitz (1), der in dem Zylinder (2) längs einer Erzeugenden vorgesehen ist, eine unter der Seitenfläche des Zylinders vorgesehene Bohrung (3), die sich in Nähe des Schlitzes befindet und in diesen ausmündet, wobei die Stange (4) zum Spannen der Platte zylindrisch und in die Bohrung (3) eingesetzt ist und einen längs einer Erzeugenden vorgesehenen Schlitz (5) besitzt, und Stützscheiben (6a, 6b) aufweist, die zu beiden Seiten des Zylinders angeordnet sind, daß die zu montierende Platte am vorderen Ende und am hinteren Ende so gebogen ist, daß Falze (12, 14, 15) entstehen, und zwar ein Falz (12) am vorderen Ende, der zur Einführung in den Schlitz (1) des Zylinders bestimmt ist, und einen Falz (15) am hinteren Ende, der zur Einführung in den Schlitz (5) der Stange nach Aufrollen der Platte auf den Zylinder (2) zwischen den Stützscheiben (6a, 6b) bestimmt ist, und daß die Einrichtung zwei Mechanismen (7a, 7b) zum Antrieb der Stange besitzt, die auf dem Zylinder außerhalb der Stützscheiben angeordnet sind.
10. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß sie einen Schlitz (1), der in dem Zylinder (2) längs einer Erzeugenden vorgesehen ist, eine unter der Seitenfläche des Zylinders vorgesehene Bohrung (3), die sich in Nähe des Schlitzes befindet und in diesen ausmündet, wobei die Stange (4) zum Spannen der Platte zylindrisch und in die Bohrung (3) eingesetzt ist und einen längs einer Erzeugenden vorgesehenen Schlitz (5) besitzt, und Stützscheiben (6a, 6b) aufweist, die zu beiden Seiten des Zylinders angeordnet sind, daß die zu montierende Platte am vorderen Ende un d am hinteren Ende so gebogen ist, daß Falze (12, 14, 15) entstehen, und zwar ein Falz (12) am vorderen Ende, der zur Einführung in den Schlitz (1) des Zylinders bestimmt ist, und einen falz (15) am hinteren Ende, der zur Einführung in den Schlitz (5) der Stange nach Aufrollen der Platte auf den Zylinder (2) zwischen den Stützscheiben (6a, 6b) bestimmt ist, und daß die Einrichtung zwei Mechanismen (7a, 7b) zum Antrieb der Stange besitzt, die zwischen den Stützscheiben in einer in der Seitenfläche des Zylinders vorgesehenen Nut angeordnet sind.
EP88400549A 1987-03-10 1988-03-09 Einrichtung zum Festhalten einer Druckplatte auf einem Plattenzylinder einer Offset-Rotationsdruckmaschine Expired - Lifetime EP0287406B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703242 1987-03-10
FR8703242A FR2612121B1 (fr) 1987-03-10 1987-03-10 Dispositif pour maintenir une plaque d'impression sur un cylindre porte-plaque dans une rotative offset

Publications (2)

Publication Number Publication Date
EP0287406A1 EP0287406A1 (de) 1988-10-19
EP0287406B1 true EP0287406B1 (de) 1992-02-12

Family

ID=9348793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400549A Expired - Lifetime EP0287406B1 (de) 1987-03-10 1988-03-09 Einrichtung zum Festhalten einer Druckplatte auf einem Plattenzylinder einer Offset-Rotationsdruckmaschine

Country Status (5)

Country Link
US (1) US4862801A (de)
EP (1) EP0287406B1 (de)
JP (1) JPS63242637A (de)
DE (1) DE3868340D1 (de)
FR (1) FR2612121B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2520213Y2 (ja) * 1989-09-21 1996-12-11 株式会社小森コーポレーション 版巻込み装置
DE4024061C2 (de) * 1990-07-28 1994-02-10 Krause Biagosch Gmbh Verfahren und Vorrichtung zur Produktivitätssteigerung von Rotationsdruckmaschinen
DE4233846A1 (de) * 1992-10-08 1994-04-14 Heidelberger Druckmasch Ag Vorgreifer einer Bogendruckmaschine
US5413042A (en) * 1994-02-22 1995-05-09 Heidelberg Druckmaschinen Ag Lock-up assembly for securing a printing plate on a plate cylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822754A (en) * 1950-05-29 1958-02-11 William F Huck Plate lock-up mechanisms for printing machines
US3727551A (en) * 1971-07-22 1973-04-17 North American Rockwell Reversible lockup for flexible printing plate
GB1321028A (en) * 1971-08-13 1973-06-20 Timsons Ltd Plate mounting means for printing cylinders
DE2441367B2 (de) * 1974-08-29 1977-12-29 Japan Society for the Promotion of Machine Industry; Tokyo Kikai Seisakusho, Ltd.; Tokio Spannvorrichtung eines formzylinders einer druckmaschine
US4527478A (en) * 1983-05-11 1985-07-09 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Means for clamping gravure plates

Also Published As

Publication number Publication date
JPH0584742B2 (de) 1993-12-03
US4862801A (en) 1989-09-05
DE3868340D1 (de) 1992-03-26
FR2612121B1 (fr) 1991-04-12
FR2612121A1 (fr) 1988-09-16
EP0287406A1 (de) 1988-10-19
JPS63242637A (ja) 1988-10-07

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