EP0453794B1 - Gerät und Verfahren zum Montieren einer Druckplatte auf einen engspaltigen Zylinder - Google Patents

Gerät und Verfahren zum Montieren einer Druckplatte auf einen engspaltigen Zylinder Download PDF

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Publication number
EP0453794B1
EP0453794B1 EP91104754A EP91104754A EP0453794B1 EP 0453794 B1 EP0453794 B1 EP 0453794B1 EP 91104754 A EP91104754 A EP 91104754A EP 91104754 A EP91104754 A EP 91104754A EP 0453794 B1 EP0453794 B1 EP 0453794B1
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EP
European Patent Office
Prior art keywords
tail member
gap
mounting arrangement
curved
tail
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
EP91104754A
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English (en)
French (fr)
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EP0453794A1 (de
Inventor
Albert Gevis
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.)
Boeing North American Inc
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Rockwell International Corp
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Filing date
Publication date
Application filed by Rockwell International Corp filed Critical Rockwell International Corp
Publication of EP0453794A1 publication Critical patent/EP0453794A1/de
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Publication of EP0453794B1 publication Critical patent/EP0453794B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B41F27/1281—Devices for attaching printing elements or formes to supports for attaching flexible printing formes details of the printing plate ends

Definitions

  • This invention relates to a printing plate mounting apparatus for releasibly connecting a printing plate to a rotary cylinder of a printing press and, more particularly, to such a mounting apparatus in which the plate is mounted by means of tail members at opposite ends which are held within a longitudinal mounting gap in the surface of the cylinder.
  • the smallest gaps which can be used are at least ten times the thickness of the plates. Specifically, the smallest gap known to operate successfully is approximately 3 mm (123 mils) thick.
  • the tail members are both substantially planar and extend at acute angles to overlie the printing plate body.
  • the tail at the leading edge is inserted in the gap and hooks around an edge.
  • the flexible body is then wrapped around the cylinder until the tail at the opposite end of the body is located opposite the gap. It is then inserted in the gap alongside the leading edge tail member and locked in place.
  • the gaps are so large, the locking mechanism often must longitudinally strain the tail member to keep it in place which can cause distortion of the tail member. This distortion is preferably avoided since it can cause jamming of the tail member within the slot and hinder or prevent subsequent removal even when the gap is relatively large.
  • attempts to reduce the gap to less than a minimum gap size of approximatley 3 mm (123 mils) results in difficulties in inserting the one tail member in the gap after the other tail has already been inserted.
  • small gap sizes can create unacceptable difficulties in removing the tail members after insertion with known printing plates.
  • a plate cylinder arranged for mounting intaglio printing plates for web-fed printing machines comprises at least one groove opening at its periphery.
  • a fastening device is disposed in the groove opening for opposed plate ends extending into the groove.
  • the tail member at one of the opposite ends of the plate is substantially curved and in contact with a tightening bar disposed in the groove opening.
  • the tightening bar abuts against the bottom of the groove, and its tapered end extends almost to the envelope of the generated surface of the plate cylinder.
  • the tapered end lies in the circumferential gap formed by the outwardly tapering groove where it opens out at the cylinder periphery.
  • Pistons strike the tightening bar which is thus thrust toward the opposed wall of the groove.
  • a clamping piece is located between this opposed wall and the tightening bar.
  • the wall of the groove on the side of the tighening bar remote from the clamping piece is substantially planar.
  • the surface thereof on the side of the clamping piece which acts as a contact surface, is adapted to the curvature of the tail member with the exception of a radially inner section.
  • the surface is slightly angled to form an edge, in order to increase the clamping effect on the curved tail member of the plate extending over this edge.
  • US-A-3,408,933 discloses a cylinder for a blanket in a printing press in which the ends of the blanket are received in a groove having an access slot comprising opposed planar surfaces used as undercut seating surfaces for the opposed ends of the blanket.
  • the known cylinder comprises a leaf spring for gripping a respective end of the blanket and a takeup spring for applying force against the leaf spring so that the latter applies a first component normal to the surface and a second component along the surface to take up any slack developing in the blanket under running conditions.
  • the blanket is tightened at its ends received in the groove in a direction parallel to the planar groove walls.
  • a printing plate having a planar body extending between a pair of opposite ends for mounting to the surface of a rotary cylinder of a printing press by means of a mounting gap for holding the body to the cylinder at said opposite ends with a narrow gap plate mounting apparatus.
  • the narrow gap plate mounting apparatus comprising a first tail member at one of said opposite ends and extending away from the planar body for receipt within the mounting gap, and a second tail member at the other one of said opposite ends and extending away from the planar body for receipt within the mounting gap together with the substantially planar tail member, which unlike known planar tail members, is substantially curved.
  • the curved shape is at least approximately involute, i.e. the locus of a fixed point on a taut, inextensible string as it unwinds from a fixed plane curve.
  • the substantially curved tail member includes a plurality of substantially planar tail member segments interconnected to approximate the curved shape of the substantially curved tail member.
  • a narrow gap mounting apparatus including a cavity within a printing press cylinder and in communication with the gap which has a substantially curved wall to mate with the substantially curved one of the tail members received through the mounting slot and means for pressing the curved one of the tails against the curved wall to hold it within the cavity.
  • An improved method of mounting a printing plate to a cylinder of a rotary printing press is then also provided which enables use of a much narrower gap than previously could be used comprising the steps of bending the opposite ends of printing plate stock to form a pair of first and second mounting tail members at opposite ends of an intermediate planar body with the second tail member being bent in a curved shape inserting the first tail member in a mounting slot in the cylinder conveying the intermediate body around the cylinder and inserting the second, curved tail member into the slot between a lagging edge of the slot and the first tail member.
  • the second tail member is bent in an approximate involute shape.
  • a narrow gap plate mating apparatus for a cylinder which reduces strain on the tail member comprising a cavity within the cylinder and having a pair of walls extending from the gap which are conformed relative to the pair of tails to receive them in mating, overlying relationship when fully inserted in the gap, a locking mechanism within the cavity including a locking member and means for moving the locking member to press one of the tail members against its mating wall in a direction substantially transverse thereto to frictionally hold it within the cavity.
  • a preferred embodiment of a printing plate 10 ⁇ incorporating the narrow gap plate mounting apparatus is seen to have a planar body 12 extending between a pair of opposite ends 14 and 16.
  • the planar body 12 is made of flexible, rolled steel or the like having a thickness of approximately 0.195 to 0.293 mm (eight to twelve mils).
  • the length of the plate 10 ⁇ between ends 14 and 16 is matched to the circumference of the plate cylinder 18 which in this particular embodiment is approximately 512.4 mm (twenty one inches). The length is also matched to that of the cylinder 18 which may vary from approximately 0.61 to 1.52 m (two to five feet).
  • the planar, resilient body 12 of the plate 10 ⁇ is mounted by wrapping the body around the surface of the cylinder 18. After being wrapped, the body is held to the cylinder 18 at the opposite ends by means including the narrow gap mounting apparatus including a first tail member 22 and a second, substantially curved tail member 24.
  • the first tail member 22 is of planar configuration and extends away from and over the planar body 12 to form an acute angle therewith of approximately forty-four degrees.
  • the length of the first tail member 22 is 8.83 mm (0 ⁇ .362 inches), and is joined at the end 14 by a bend having a radius of 0.37 mm (0 ⁇ .0 ⁇ 15 inches).
  • the second, curved tail member 24 at the other opposite 16 also extends away from and over the planar body 12 for receipt within the mounting gap, or slot, 20 ⁇ together with the substantially planar tail member 22.
  • the objectives are achieved by providing the second tail member with a substantially curved configuration.
  • the substantially curved tail 24 has a curved shape which is at least approximately involute.
  • the substantially curved shape is achieved by providing a plurality of substantially planar tail member segments 24A, 24B and 24C which are interconnected to approximate the substantially curved shape of the second tail member 24.
  • the three planar tail member segments 24A, 24B and 24C are interconnected to approximate an involute shape.
  • the lengths of segments 24A, 24B and 24C are 1.66 mm (0 ⁇ .0 ⁇ 68 inches), 9.59 mm (0 ⁇ .393 inches) and 7.76 mm (0 ⁇ .318 inches), respectively.
  • the segment 24A forms a right angle with the body 12 and has a bend radius of 0.24 mm (0 ⁇ .0 ⁇ 10 ⁇ inches).
  • the middle segment 24B forms an angle of eighty-seven degrees and the distal segment 24C forms an angle of approximately seventy degrees relative to the planar body 12.
  • the maximum bend radius for the bends at the beginning of segments 24B and 24C is 0.73 mm (0 ⁇ .0 ⁇ 30 ⁇ inches). While this specific configuration and dimensions for approximating a substantially curved shape for tail 24 has worked successfully, it should be appreciated that variations may be made while still retaining the advantages of the invention.
  • the aspect of the plate mounting apparatus associated with the cylinder 18 is seen to include a cavity 26 within the cylinder 18 and in communication with the gap 20 ⁇ which has a substantially curved wall 28.
  • the curve of wall 28 is selected to congruently mate with the substantially curved tail member 24.
  • the substantially curved wall 28, conforming to the substantially curved tail member 24 of Fig. 1 has three planar segments 28A, 28B and 28C for respectively mating with the curved tail member segments 24A, 24B and 24C to approximate an involute curve.
  • the substantially curved tail member 24 snugly fits against the substantially curved wall 28 when the tail member 24 is fully inserted through the gap 20 ⁇ .
  • a curved, resilient locking member 30 ⁇ of a rotatable locking mechanism is pressed against the substantially curved tail member 24 at its distal segment 24C to cause it to resiliently press against the curved wall 28 to frictionally hold it within cavity 26.
  • the locking mechanism includes a lock rotor 32 mounted for rotation within the cavity about an axis parallel to that of the cylinder 28 and defined by a cylindrical wall 26A of the cavity 26. When rotated in the direction of arrow 33 from the locked position shown in Fig. 2 to an unlocked position, the resilient locking member 30 ⁇ is disengaged from the curved wall 28.
  • the resilient locking member 30 ⁇ is releasably attached to the rotor 32 by means of a plurality of screws 35 which are fastened to the underside of a channel 36 provided for that purpose.
  • the rotor 32 has a cylindrical wall portion 32A which is rotatably supported within a matching cylindrical wall portion 26A of the cavity 26.
  • planar wall 34 which ends at the leading edge 20 ⁇ A of the gap 20 ⁇ and conforms to the first planar tail member 22.
  • Planar wall 34 is formed in the side of an insert 38 fitted into an irregularly shaped groove 40 ⁇ in the cylinder 18, while the planar wall segments 28A, 28B and 28C are defined by the walls of the groove 40 ⁇ itself.
  • the lock rotor 32 is seen to be slideably removable from the cavity 26 at one end of cylinder 18 and is locked adjacent an adjustment screw 42.
  • a worm gear 44 is connected to the lock rotor 32 and engages a threaded section 42A of the adjustment screw 42. Accordingly, when the adjustment screw 42 is rotated in one direction, the worm gear 44 and, thus, the lock rotor 32 and resilient locking arm are rotated in one direction to the unlocked position shown in Fig. 2. When the adjustment screw 42 is rotated in the other direction, the worm gear 44 causes the lock rotor 32 to move to the unlocked position shown in Fig. 4.
  • the printing plate body 12 is mounted to the cylinder 18 by first fully inserting the planar tail member 22 into the gap and then wrapping the body 12 around the cylinder 18 in the direction of its normal rotation. After the planar body has been wrapped all the way around the cylinder 18, the curved tail member is fully inserted through the gap 20 ⁇ between the lagging edge 20 ⁇ B of gap 30 ⁇ and the first, planar tail member 22.
  • the narrow gap eliminates the need for a locking mechanism which strains the tail member by pulling on it. Accordingly, the locking member 30 ⁇ which only presses against the tail member 24 in a normal direction is employed to hold the curved first member 24 against the wall 28 after they are aligned.

Claims (20)

  1. Befestigungsvorrichtung zum Befestigen einer Druckplatte (10) an der Oberfläche eines Drehzylinders (18) einer Druckerpresse, wobei die Druckplatte (10) einen ebenen Körper (12) aufweist, der sich vollständig zwischen zwei voneinander abgewandten Enden (14, 16) erstreckt, und wobei der Zylinder (18) einen schmalen Befestigungsspalt (20) zum Halten des Körpers (12) an dem Zylinder (15) an den voneinander abgewandten Enden (14, 16) aufweist, wobei die Befestigungsvorrichtung enthält:
    ein von dem ebenen Körper (12) wegragendes erstes Endteil (22) an einem (14) der voneinander abgewandten Enden (14, 16) für die Aufnahme innerhalb des Befestigungsspalts (20); ein von dem ebenen Körper (12) wegragendes zweites, im wesentlichen gekrümmtes Endteil (24) an dem anderen (16) der voneinander abgewandten Enden (14, 16) zur Aufnahme innerhalb des Befestigungsspalts (20) zusammen mit dem ersten Endteil (22), und
    einen Hohlraum (26) innerhalb des Zylinders (18), der mit dem Spalt (20) in Verbindung steht;
    dadurch gekennzeichnet,
    daß das zweite, im wesentlichen gekrümmte Endteil (24) eine gekrümmte Gestalt aufweist, die wenigstens angenähert eine Involute ist, daß eine erste Wand (28) des Hohlraums (26) im wesentlichen gekrümmt ist, um sich dem zweiten Endteil (24) anzupassen, und daß ein Mittel (30, 32) vorgesehen ist, um das zweite Endteil (24) gegen die erste, im wesentlichen gekrümmte Wand (28) in eine Richtung zu drücken, die im wesentlichen senkrecht zur Ebene der Berührung damit ist, um Längsbelastung und Verwindung des zweiten Endteils (24) wesentlich zu reduzieren.
  2. Befestigungsvorrichtung nach Anspruch 1, bei der das erste Endteil (22) im wesentlichen nicht gekrümmt ist.
  3. Befestigungsvorrichtung nach Anspruch 1, bei der das zweite, im wesentlichen gekrümmte Endteil (24) mehrere Segmente (24A, 24B, 24C) aufweist, die zur Annäherung an die Involutengestalt miteinander verbunden sind.
  4. Befestigungsvorrichtung nach Anspruch 3, bei der wenigstens einige der Segmente (24A, 24B, 24C) im wesentlichen nicht gekrümmt und eben sind.
  5. Befestigungsvorrichtung nach Anspruch 1, bei der das Druckmittel (30, 32) dafür vorgesehen ist, das zweite Endteil (24) durch Reibung innerhalb des Hohlraums (26) zu halten.
  6. Befestigungsvorrichtung nach Anspruch 2, bei der der Hohlraum (26) eine der ersten, im wesentlichen gekrümmten Wand (28) gegenüberliegende zweite Wand (34) aufweist, die im wesentlichen nicht gekrümmt ist, um sich dem ersten, im wesentlichen nicht gekrümmten Endteil (22) anzupassen.
  7. Befestigungsvorrichtung nach Anspruch 1, bei der das Druckmittel (30, 32) ein Sperrglied (30) aufweist, um das zweite, im wesentlichen gekrümmte Endteil (24) gegen die erste, im wesentlichen gekrümmte Wand (28) zu drücken.
  8. Befestigungsvorrichtung nach Anspruch 7, bei der das Druckmittel (30, 32) ein Mittel (32) aufweist, um das Sperrglied (30) zwischen einer Sperrposition, in der es das im wesentlichen gekrümmte Endteil (24) gegen die erste, im wesentlichen gekrümmte Wand (28) drückt, und einer Freigabeposition zu bewegen, in der das zweite Endteil (24) nicht gegen die erste Wand (28) gedrückt wird.
  9. Befestigungsvorrichtung nach Anspruch 7, bei der das Sperrglied (30) federnd ist.
  10. Befestigungsvorrichtung nach Anspruch 1, bei der die erste, im wesentlichen gekrümmte Wand (28) angenähert eine Involute ist.
  11. Befestigungsvorrichtung nach Anspruch 1, bei der die erste, im wesentlichen gekrümmte Wand (28) mehrere Wandsegmente (28A, 28B, 28C) aufweist, die zur Annäherung an eine im wesentlichen gekrümmte Gestalt der ersten Wand (28) miteinander verbunden sind.
  12. Befestigungsvorrichtung nach Anspruch 1, bei der die erste und die zweite Wand (28, 34) des Hohlraums (26) voneinander beabstandet sind, um einen Spalt (20) mit einer Abmessung zu schaffen, die wesentlich kleiner als 3,0 mm (0,123 Inch) ist.
  13. Befestigungsvorrichtung nach Anspruch 1, bei der der Spalt (20) so gewählt ist, daß er eine Abmessung aufweist, die weniger als 1,22 mm (0,050 Inch) größer als die Dicke des Plattenkörpers (12) ist.
  14. Befestigungsvorrichtung nach Anspruch 1, bei der der Spalt (20) einen Vorderrand und einen Hinterrand aufweist und sich die erste, im wesentlichen gekrümmte Wand (28) an den Hinterrand anschließt.
  15. Befestigungsvorrichtung nach einem der vorangehenden Ansprüche, bei der die sich von dem Spalt (20) erstreckende erste und die zweite Wand (28, 34) des Hohlraums (26) relativ an das erste und das zweite Endteil (22, 24) angepaßt sind, um diese in einer aneinander angepaßten, einander überlappenden Beziehung aufzunehmen, wenn sie vollständig in den Spalt (20) eingesetzt sind.
  16. Befestigungsvorrichtung nach den Ansprüchen 7 und 15, bei der das Sperrglied (30) gekrümmt ist.
  17. Befestigungsvorrichtung nach den Ansprüchen 8 und 16, bei der das Bewegungsmittel (32) ein Mittel zum Drehen des Sperrgliedes (30) in die Sperrposition aufweist.
  18. Befestigungsvorrichtung nach Anspruch 17, bei der das Drehmittel (32) ein Schneckengetriebe (44) aufweist, das mit dem Sperrglied (30) verbunden ist.
  19. Verfahren zum Befestigen einer Druckplatte (10) an einem Zylinder (18) einer Rotationsdruckerpresse mit den folgenden Schritten:
    Biegen der voneinander abgewandten Enden eines Druckplattenexemplars zur Bildung eines ersten und eines zweiten Endteils (22, 24) an voneinander abgewandten Enden (14, 16) eines ebenen Zwischenkörpers (12), wobei das zweite Endteil (24) in eine gekrümmte Form gebogen wird;
    Einschieben des ersten Endteils (22) in einen Befestigungsspalt (20) in dem Zylinder (18);
    Herumführen des Zwischenkörpers (12) um den Zylinder (18);
    Einschieben des zweiten, gekrümmten Endteils (24) in den Spalt (20) zwischen einem Hinterrand des Spalts (20) und dem ersten Endteil (22);
    gekennzeichnet durch die Tatsche, daß der Schritt des Biegens den Schritt des Biegens des ersten, gekrümmten Endteils (24) in eine im wesentlichen involutenförmige Gestalt umfaßt, und durch den Schritt des Drückens des zweiten, gekrümmten Endteils (24) gegen eine entsprechende gekrümmte Wand (28) eines mit dem Spalt (20) in Verbindung stehenden Hohlraums (26) in einer zur Oberfläche des zweiten, gekrümmten Endteils (24) im wesentlichen senkrechten Richtung an einer Stelle, an der Druck auf dieses ausgeübt wird, um eine Beanspruchung des zweiten Endteils (24) zu vermeiden.
  20. Verfahren nach Anspruch 19, bei dem der Schritt des Biegens des zweiten Endteils (24) in eine im wesentlichen involutenförmige Gestalt die Schritte des Ausführens von mehreren, aufeinanderfolgenden Biegungen entlang dem zweiten Endteil (24) enthält, um die Involutengestalt zu approximieren.
EP91104754A 1990-04-24 1991-03-26 Gerät und Verfahren zum Montieren einer Druckplatte auf einen engspaltigen Zylinder Expired - Lifetime EP0453794B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51353890A 1990-04-24 1990-04-24
US513538 1990-04-24

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EP0453794A1 EP0453794A1 (de) 1991-10-30
EP0453794B1 true EP0453794B1 (de) 1994-10-26

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EP91104754A Expired - Lifetime EP0453794B1 (de) 1990-04-24 1991-03-26 Gerät und Verfahren zum Montieren einer Druckplatte auf einen engspaltigen Zylinder

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EP (1) EP0453794B1 (de)
JP (1) JPH04224954A (de)
CA (1) CA2038809C (de)
DE (2) DE453794T1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404758C2 (de) * 1994-02-15 1996-06-27 Roland Man Druckmasch Verfahren und Vorrichtung zum Wechseln der Bespannung eines Zylinders einer Rollenrotationsdruckmaschine
FR2737149B1 (fr) * 1995-07-25 1997-10-17 Heidelberg Harris Sa Dispositif de fixation d'une plaque d'impression sur un cylindre porte-plaque
DE19642141C1 (de) * 1996-10-12 1998-06-18 Koenig & Bauer Albert Ag Vorrichtung zum Lösen von Platten
JP4666707B2 (ja) * 1999-12-21 2011-04-06 株式会社ミヤコシ 版胴における刷版クイックくわえ装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408933A (en) * 1966-03-24 1968-11-05 Miehle Goss Dexter Inc Continuous take-up clamping arrangement for blanket in printing press

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022728A (en) * 1959-11-12 1962-02-27 American Type Founders Co Inc Printing plates and methods and apparatus for forming them
DE2334127A1 (de) * 1973-07-05 1975-01-23 Koenig & Bauer Ag Vorrichtung zum befestigen und spannen von biegsamen druckplatten
US4214530A (en) * 1978-02-23 1980-07-29 Glanzner Gary C Metal printing plate
EP0142874B1 (de) * 1983-11-14 1988-04-27 De La Rue Giori S.A. Zum Aufspannen von Stichdruckplatten eingerichteter Formzylinder für Rollendruckmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408933A (en) * 1966-03-24 1968-11-05 Miehle Goss Dexter Inc Continuous take-up clamping arrangement for blanket in printing press

Also Published As

Publication number Publication date
DE69104764T2 (de) 1995-05-04
DE453794T1 (de) 1992-02-06
EP0453794A1 (de) 1991-10-30
CA2038809C (en) 1998-12-08
DE69104764D1 (de) 1994-12-01
CA2038809A1 (en) 1991-10-25
JPH04224954A (ja) 1992-08-14

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