EP0124008B1 - Dispositif de tension de plaques d'impression - Google Patents

Dispositif de tension de plaques d'impression Download PDF

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Publication number
EP0124008B1
EP0124008B1 EP84104327A EP84104327A EP0124008B1 EP 0124008 B1 EP0124008 B1 EP 0124008B1 EP 84104327 A EP84104327 A EP 84104327A EP 84104327 A EP84104327 A EP 84104327A EP 0124008 B1 EP0124008 B1 EP 0124008B1
Authority
EP
European Patent Office
Prior art keywords
clamping
cylindrical body
bar
plate
segment
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
Application number
EP84104327A
Other languages
German (de)
English (en)
Other versions
EP0124008A2 (fr
EP0124008A3 (en
Inventor
Joachim Dorow
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0124008A2 publication Critical patent/EP0124008A2/fr
Publication of EP0124008A3 publication Critical patent/EP0124008A3/de
Application granted granted Critical
Publication of EP0124008B1 publication Critical patent/EP0124008B1/fr
Expired 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 tensioning printing plates, in particular stretchable printing plates such as offset plates, with two clamping jaws, which are attached to the opposite flanks of an interrupted cylinder body and delimit a clamping channel and can be brought into engagement with a plate-side edge claw, each of which a clamping member is assigned to and from which at least one is pivotally mounted on the cylinder body about an axis offset parallel to the axis of the cylinder body in the radial direction.
  • the pivotable clamping jaw is designed as a flap which is pivotably arranged in the clamping channel and has an L-shaped cross section, with the aid of which the plate-side edge claw is drawn into the clamping channel via the adjacent, cylinder body-side clamping channel edge.
  • Arrangements of this type therefore result in a comparatively large width of the tensioning channel and thus a comparatively large width of the non-printing strip present in the area of the tensioning channel, which has a negative effect on the economy.
  • there is a risk with arrangements of this type that the plate is deformed when it is clamped or unclamped, which makes reuse impossible.
  • a further advantageous measure can consist in the fact that the stop has a plurality of stop strips distributed over the cylinder width and projecting beyond the convex base surface in the opposite direction to the engaging edge, which engage in grooves provided on the cylinder body side, each containing a stop surface, and each of which is assigned a cam of the camshaft that extends through the segment body width is.
  • the camshaft is designed and arranged in such a way that the stop strips can be moved past it outside of the clamping position.
  • a large pivoting range of the segment body is achieved, so that the engaging edge in question can be pivoted far out of the circumference of the cytinder.
  • a further expedient measure can consist in the fact that the pivotable segment body is provided in the area of at least one end with a driving device which is arranged in the area of the axis of curvature of the convex base surface and is preferably designed as a hexagon.
  • the segment body can simply be in positive engagement with holding claws fastened to the cylinder body and having guide surfaces parallel to the base surface.
  • the clamping members assigned to the clamping jaws can be designed as two-armed swivel bars mounted on an axis mounted on the clamping jaw side, the radially inner arm of the swivel bar on the segment body side having a contact surface facing the opposite swivel bar, which moves when the segment body moves runs in the relaxation direction on the radially inner arm of the opposite swivel bar.
  • the design of the clamping members as preferably continuous strips allows the plates to be held firmly.
  • the above measures ensure that the swivel bars open automatically when relaxing, which ensures a high level of user-friendliness.
  • Another advantage of the two-armed swivel bar design can be seen in the fact that simple actuation by means of an eccentric shaft is possible.
  • the respective axis and eccentric shaft assigned to a swivel bar which extend over the entire cylinder width, can be accommodated on a plurality of webs of the clamping jaws projecting over the cylinder width, the swivel bars being divided in the region of the webs.
  • This measure results in a multiple bearing of the continuous axis and eccentric shaft, so that no deflection is to be feared even with a large cylinder width.
  • the plate cylinder cooperating with a rubber cylinder is provided with a plate clamping device for holding and clamping the plates.
  • the plate clamping device on which the drawing is based consists, as can be seen in particular from FIGS. 1 and 2, of two on the opposite flanks of an axially parallel clamping channel 2 formed by a circumferential interruption of a cylinder body 1 formed in a manner not shown with a central axis arranged clamping jaws 3 and 4, the circumferential contour of which terminates in an engagement edge 5 which is beak-shaped in cross section.
  • the clamping jaw 3 shown on the left is rigidly connected to the cylinder body 1.
  • the clamping jaw 3 can either be integrally formed on the cylinder body 1 or, as here, screwed to the cylinder body 1.
  • the peripheral contour 6 of the stationary clamping jaw 3 has a curvature corresponding to the cylinder jacket and connects continuously to the lateral surface 7 of the cylinder body 1.
  • the clamping jaw 4 shown on the right is pivotally received on the cylinder body 1 about an axis 8 which is radially offset from the axis of the cylinder body 1 and runs parallel thereto, in such a way that its engaging edge 5 according to arrow 9 from the position opposite the engaging edge 5 of the opposing clamping jaw 3 1 can be pivoted out of the cylinder circumference into the position on which FIG. 2 is based.
  • the swiveling clamping jaw 4 is designed as a segment body which is triangular in cross section, the tip of which forms the engaging edge 5 is connected to a base surface 10 by radially inner and outer side surfaces.
  • the radially outer side surface of the segment body 4 has a circumferential contour 11 which corresponds to the curvature of the cylinder jacket and which adjoins the circumferential contour 7 of the cylinder body 1 in the clamping position on which FIG. 1 is based.
  • the base surface 10 is convexly curved with respect to the ideal pivot axis 8.
  • the base surface 10 runs on a correspondingly concavely curved running surface 12 of a bearing socket 13 provided on the cylinder body side.
  • the circumferential contour 11 of the segment body 4 curved in accordance with the cylinder jacket ends at the convex base surface 10, just as the jacket surface 7 of the cylinder body 1 ends at the concave running surface 12.
  • the segment body 4 is set in such a way that its circumferential contour 11 merges smoothly into the circumferential contour 7 of the cylinder body 1.
  • there is only a gap-free joint which therefore does not have a negative effect on the support of the plate accommodated on the cylinder circumference.
  • the gap 15 between the mutually opposite engagement edges 5 is practically reduced to such an extent that the non-printing strip caused thereby results only from the rounding of the bending edges of the plate that is present here.
  • the segment body 4 To pivot the segment body 4, it can be connected to a toggle lever system supported on the cylinder body side.
  • the segment body 4 is simply provided with a hexagon 16 arranged on the end face, to which a wrench can be attached.
  • the hexagon 16 is located in the region of the ideal pivot axis 8 of the segment body 4 supported on the base surface side.
  • the hexagon 16 is here, as can best be seen from FIG. 3, simply molded onto a pin 17 which projects on the end face. It is sufficient if such a driving device is provided in the area of one end face.
  • an Allen recess assigned to a socket wrench could also be provided, although the use of an external hexagon is preferable for manufacturing reasons.
  • retaining claws 18 are provided on the end faces of the cylinder body 1, which have a guide groove 19 parallel to the base surface, into which a correspondingly curved guide strip 20 of the segment body 4 engages positively.
  • the last phase of the pivoting movement of the segment body 4 before reaching the clamping position i.e. the actual clamping movement, is not accomplished with the aid of a wrench that can be attached to the hexagon 16, but with a cam shaft 21 mounted in the cylinder body 1, with the aid of which the required clamping force can be easily applied .
  • the plate to be clamped can be bent at its ends to form the edge claws so that the dimension between the bending edges compared to the radian dimension between the engaging edges 5 in the clamping position has a small undersize.
  • the clamping force that can be applied with the aid of the segment body 4 enables a corresponding expansion of the plate, thus ensuring that the plate fits snugly against the cylinder circumference.
  • the camshaft 21 provided for applying the clamping force interacts with a projection 22 fastened to the segment body 4, which projects in the opposite direction to the engagement edge 5 via the ideal axis of rotation 8.
  • the clamping position is defined by a stop surface 23 provided on the cylinder body side, to which the projection 22 is pressed by the camshaft 21 interacting with it, as indicated in FIG. 2 by dash-dotted lines.
  • the projection 22 is designed in the form of a plurality of stop strips 24, which are distributed uniformly over the length of the segment body 4 and protrude beyond the base surface 10 and engage in grooves 25 provided on the cylinder body side and each containing a stop surface 23.
  • the camshaft 21 extends over the entire length of the assigned segment body 4 and is provided with a cam 26 per stop bar 24, as can best be seen from FIG. In the tensioned position, the camshaft 21 is secured against twisting. For this purpose, the camshaft 21, as shown in FIG.
  • the camshaft 21 is provided in the area of one end or preferably in the area of both ends with a hexagon 30 projecting beyond the holding flange 27, to which a corresponding wrench can be attached.
  • the camshaft 21 is so far distanced from the ideal axis of rotation 8 of the segment body 4 and flattened on the side opposite the cam 26 that the stop strips 24 assigned to the cams 26 are shown in FIG solid lines indicated camshaft position can be moved past the flat 31. This ensures that the segment body 4 can be brought completely out of engagement with the camshaft 21, which enables a large pivoting range.
  • the camshaft 21 is simply brought from the tensioned position indicated by dash-dotted lines in FIG. 2 by 60 ° into the disengaged position indicated by solid lines in FIG. 2.
  • the segment body 4 is intended to be continuous over the entire width of the cylinder.
  • the segment body 4 could also be divided into two sections, each with a plate width of the appropriate length.
  • each section could be assigned a camshaft, which can be actuated from the same or from opposite cylinder faces. If both cams are actuated Waves from the same end face of the cylinder would have to be provided with a central bore through this end face, through which the further camshaft could be passed.
  • clamping members are assigned to the engagement edges on both sides, which press the edge claws of the plate to be clamped, which are formed by angling, against a clamping surface 32 provided on the clamping jaw side and thus ensure good holding of the plate.
  • clamping strips are provided here in the form of swivel strips 33 with two arms in cross section, each of which is pivotably received on a continuous axis 34 on the clamping jaw side.
  • the radially outer arm of the swivel bars 33 is each provided with a clamping surface opposite the associated clamping surface 32.
  • an eccentric shaft 35 is assigned to each of them, which acts on their radially inner arm.
  • the radially inner arm of the swivel ledge 33 on the segment body side as can best be seen from FIG. during a movement in the relaxation direction, on the radially inner arm of the opposite pivot bar 33 assigned to the stationary clamping jaw 3. This ensures that when the segment body 4 moves in the relaxation direction, the swivel bars 33 bring one another into their open position, provided that the respectively assigned eccentric shaft 35 has been brought into the relaxation position beforehand, which has proven to be very user-friendly.
  • the eccentric shafts 35 can also be rotated here using a wrench. For this purpose, as best shown in FIGS.
  • the eccentric shafts 35 are simply provided with a hexagon 37 which is accessible from the relevant cylinder end face in the region of one end or in the region of both ends.
  • clamping lugs 38 are provided at the ends of the axles 34, which comprise the respectively assigned eccentric shaft 35.
  • the clamping tabs 38 as can best be seen from FIG. 1, are provided with clamping jaws formed by a slot 39 and comprising the respectively assigned eccentric shaft 35, which can be clamped together by a clamping screw 40.
  • the axes 34 and the eccentric shafts 35 extend over the entire width of the cylinder. To avoid deflection, multiple storage over the length is therefore provided.
  • the stationary clamping jaw 3 and the movable clamping jaw 4 formed by the pivotable segment body are provided with webs 41 projecting into the clamping channel 2, on which the respective axis 34 and eccentric shaft 35 are received.
  • the webs 41 as shown in FIG. 4, also serve to stabilize the stop bars 24.
  • the swivel bars 33 accommodated on one axis 34 can, as FIG. 4 also shows, be subdivided in the area of the webs 41 to achieve simple manufacture.
  • the eccentric shafts 35 and the camshaft 26 are first brought into their relaxation position on which FIG. 2 is based.
  • the segment body 4 is then brought into the pivoted-out position on which FIG. 2 is based.
  • the angled edge claws of the plate are inserted between the clamping surfaces of the swivel bars and the respectively assigned clamping jaws.
  • the eccentric shafts 35 are then brought into the clamping position. Before this, the segment body 4 can be slightly turned back.
  • the cylinder body 1 is formed in one piece.
  • the cylinder body 1 it would also be conceivable to design the cylinder body 1 in such a way that there would be a section which is stationary with respect to the cylinder axis and a section which can be pivoted with respect to the cylinder axis.
  • the segment body 4, which can be pivoted about the axis 8 offset parallel to the cylinder axis, could expediently be accommodated on the section of the cylinder body which can be pivoted about the cylinder axis.
  • the clamping force could be increased by pivoting the section of the cylinder body 1 which can be pivoted about the cylinder axis.

Landscapes

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

Claims (9)

1. Dispositif de serrage de plaques d'impression, en particulier de plaques ductiles, telles que les plaques offset, du type comportant deux mâchoires (3 ou 4) pouvant être amenées chacune en prise avec une griffe de bord côté plaque, respective, délimitant un canal de serrage (2) et appliquées sur les flancs, qui se font face, d'un corps de cylindre (1 ) interrompu, mâchoires à chacune desquelles est associé un organe de serrage (33) et dont l'une au moins est montée sur le corps de cylindre, pivotante autour d'un axe (8) décalé en direction radiale par rapport, et parallèlement à, l'axe du corps de cylindre (1 ) caractérisé par le fait que la mâchoire de serrage pivotante (4) est en forme de corps de segment à section triangulaire, ménagé dans la zone de la périphérie du corps de cylindre (1 ) qui présente un contour périphérique (11 ) correspondant à la courbure de la surface d'enveloppe (7) du corps de cylindre (1) et qui est muni d'une surface de base (10) convexe circulaire qui le délimite et qui est engagée en contact dans une crapaudine (13) ménagée côté corps de cylindre, dont la surface de fond (12) concave, circulaire, limite la surface enveloppe (7) du corps de cylindre (1), qui présente une surface de butée (23) sur laquelle, dans la position de serrage, peut venir s'appuyer une butée, côté corps de segment, (saillie 22), au moyen d'un arbre à cames (21 ) monté tournant, côté corps de cylindre, et qui est verrouillable par rapport audit corps de cylindre.
2. Dispositif selon la revendication 1, caractérisé par le fait que la saillie (22), formant bras de butée, possède plusieurs languettes de butée (24) faisant saillie sur la surface de base (10) convexe, distribuées sur la longueur de corps de segment (4) et qui s'engagent dans des rainures (25) prévues côté corps de cylindre et contenant chacune une surface de butée (23), et à chacune desquelles est associée une came (26) de l'arbre à cames (21 ) traversant sur la longueur du corps de segment (4) associé, qui est agencé et disposé de manière que les languettes de butée (24) puissent y être amenées à l'extérieur de la position de serrage.
3. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que l'arbre à cames (21 ) est muni d'au moins un flasque de retenue (27) en saillie par rapport à un moyen d'entraînement, avantageusement de forme hexagonale (30), situé sur la face frontale du cylindre et qui est muni de trous oblongs (28) traversés par des vis de blocage (29) associées.
4. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le corps de segment (4) pivotant est muni, dans la zone d'au moins une extrémité, d'un moyen d'entraînement, de préférence hexagonal, disposé au voisinage de l'axe (8) de la courbure convexe de la surface de base (10).
5. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le corps de segment (4) est, au voisinage de sa face frontale, en prise, par correspondance de forme, avec des griffes de retenue (18) possédant des surfaces de guidage parallèles aux surfaces de base fixées au corps de cylindre (1).
6. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que les organes de serrage associés respectivement aux mâchoires de serrage (3 ou 4) sont en forme de languettes pivotantes (33) à deux bras, montées sur un axe (34) situé côté mâchoires et le bras intérieur radial de la languette pivotante (33), côté corps de segment, possède une surface de décollage (36) tournée vers la languette pivotante qui lui fait face et qui, lors du mouvement du corps de segment (4) en direction de desserrage (flèche 9), commence par se déplacer sur le bras intérieur radial de la languette pivotante (35) qui lui fait face.
7. Dispositif selon la revendication 6, caractérisé par le fait que les languettes pivotantes (33) sont actionnables en direction de serrage au moyen chacune d'un arbre d'excentrique (35) attaquant leur bras intérieur radial, et qu'au moins au voisinage d'une extrémité, possède un moyen d'entraînement, avantageusement à six pans (37), et ces languettes pivotantes sont fixables par un maillon de serrage (38) fixé sur l'axe (35) recevant les languettes (33) correspondantes.
8. Dispositif selon les revendications 6 ou 7, caractérisé par le fait que les axe (34) et arbre d'excentrique (35) traversant toute la largeur de cylindre, associés respectivement à une languette pivotante (33), de préférence subdivisée en plusieurs sections, sont supportés par plusieurs traverses (41 ) des mâchoires de serrage (3 ou 4), en saillie côté canal de serrage, réparties sur la largeur du cylindre.
9. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le corps de segment (4) est subdivisé, sur la largeur de cylindre, en plusieurs sections de chacune une largeur de plaque, les différentes sections du corps de segment subdivisé (4) étant associées chacune à un arbre à cames et les arbres à cames en saillie latéralement les uns par rapport aux autres étant enfoncés les uns dans les autres.
EP84104327A 1983-04-28 1984-04-17 Dispositif de tension de plaques d'impression Expired EP0124008B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833315488 DE3315488A1 (de) 1983-04-28 1983-04-28 Vorrichtung zum spannen von druckplatten
DE3315488 1983-04-28

Publications (3)

Publication Number Publication Date
EP0124008A2 EP0124008A2 (fr) 1984-11-07
EP0124008A3 EP0124008A3 (en) 1985-07-03
EP0124008B1 true EP0124008B1 (fr) 1987-11-19

Family

ID=6197636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104327A Expired EP0124008B1 (fr) 1983-04-28 1984-04-17 Dispositif de tension de plaques d'impression

Country Status (4)

Country Link
US (1) US4546702A (fr)
EP (1) EP0124008B1 (fr)
JP (1) JPS6034858A (fr)
DE (2) DE3315488A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE4220011A1 (de) * 1992-05-16 1993-11-18 Kba Planeta Ag Verfahren und Einrichtung zum automatischen Ein- und/oder Auszug von flexiblen Druckplatten

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DE3516682A1 (de) * 1985-05-09 1986-11-13 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum parallelen spannen von druckplatten auf dem plattenzylinder von druckmaschinen
US5094165A (en) * 1989-08-04 1992-03-10 Komori Corporation Plate lockup apparatus for sheet-fed press
US5182994A (en) * 1989-08-04 1993-02-02 Komori Corporation Plate lockup apparatus for sheet-fed press
US5271324A (en) * 1992-09-18 1993-12-21 Rockwell International Corporation Locking device for a printing press
DE4420314C2 (de) * 1994-06-10 1999-02-04 Koenig & Bauer Albert Ag Vorrichtung zum Befestigen und Spannen von Druckplatten mit "Z"-förmig abgekanteten Enden
US5882006A (en) * 1995-10-06 1999-03-16 Baldwin Technology Corporation Apparatus and method for turning and orienting articles within an article pathway
DE19537420C1 (de) * 1995-10-07 1997-03-13 Koenig & Bauer Albert Ag Vorrichtung zum Befestigen und Spannen von Druckplatten mit abgekanteten Enden
CN1061578C (zh) * 1996-05-06 2001-02-07 丰田自动车株式会社 具有感应线圈的铸造装置
US6117615A (en) * 1999-07-28 2000-09-12 E. I. Du Pont De Nemours And Company Method for mounting multiple printing elements onto a cylindrical element

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US2056991A (en) * 1934-03-13 1936-10-13 Hoe & Co R Printing cylinder
US2051858A (en) * 1934-12-18 1936-08-25 Hoe & Co R Printing cylinder
US2105452A (en) * 1935-12-18 1938-01-11 New Era Mfg Company Plate clamp
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DE2220652C3 (de) * 1972-04-27 1975-04-17 Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach Vorrichtung zum Befestigen von Druckplatten auf dem Plattenzylinder einer Rotationsdruckmaschine
DE2759434C3 (de) * 1977-10-01 1981-07-30 Albert-Frankenthal Ag, 6710 Frankenthal Vorrichtung zum Spannen von biegsamen Druckplatten am Formzylinder von Rotationsdruckmaschinen
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DE3304946A1 (de) * 1983-02-12 1984-10-11 Albert-Frankenthal Ag, 6710 Frankenthal Vorrichtung zum erleichtern des abnehmens von wickelplatten vom formzylinder einer tiefdruckmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220011A1 (de) * 1992-05-16 1993-11-18 Kba Planeta Ag Verfahren und Einrichtung zum automatischen Ein- und/oder Auszug von flexiblen Druckplatten

Also Published As

Publication number Publication date
EP0124008A2 (fr) 1984-11-07
JPS6034858A (ja) 1985-02-22
JPH0216701B2 (fr) 1990-04-18
DE3315488A1 (de) 1984-10-31
US4546702A (en) 1985-10-15
DE3467530D1 (en) 1987-12-23
EP0124008A3 (en) 1985-07-03

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