EP0904936A2 - Ausbau und Austausch von Druckzylindern einer Flexodruckmaschine - Google Patents

Ausbau und Austausch von Druckzylindern einer Flexodruckmaschine Download PDF

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Publication number
EP0904936A2
EP0904936A2 EP98117085A EP98117085A EP0904936A2 EP 0904936 A2 EP0904936 A2 EP 0904936A2 EP 98117085 A EP98117085 A EP 98117085A EP 98117085 A EP98117085 A EP 98117085A EP 0904936 A2 EP0904936 A2 EP 0904936A2
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EP
European Patent Office
Prior art keywords
fact
cylinders
cylinder
accordance
equipment
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.)
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Application number
EP98117085A
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English (en)
French (fr)
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EP0904936A3 (de
Inventor
Fausto Gasparini
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0904936A2 publication Critical patent/EP0904936A2/de
Publication of EP0904936A3 publication Critical patent/EP0904936A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/0016—Storage devices for printing cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/20—Supports for bearings or supports for forme, offset, or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing

Definitions

  • This invention relates to a method and the related equipment for the removal and replacement of the impression cylinders of a flexographic press, in which a set of supports mounted on a carriage are moved so that they engage the cylinder shafts from below, the said supports are raised by a pre-set distance so that the cylinder shafts are removed from their seatings, and the said supports traverse to move the cylinders.
  • the brackets along which the impression cylinder carriages run are positioned on parallel planes, in particular horizontal planes.
  • the method in accordance with the invention enables the cylinders to be removed and replaced very rapidly, with no risk of damage, thus drastically reducing the down time which currently has adverse effects on the output of the press.
  • figure 1 schematically illustrates a partial side view of a known flexographic press.
  • Flexographic presses are printing presses that use embossed plates, usually made of rubber, which allow any material, including plastic, to be printed.
  • the film to be stamped shown as no. 1 in figure 1, runs over a large cylinder 2 which acts as a support and stop; a set of impression cylinders 3, each of which prints with a different coloured ink, is fitted around the said support cylinder.
  • Each of the said impression cylinders is coupled to an inking roller 4, usually made of ceramic.
  • the plate with the image to be printed is fitted to cylinders 3, which have to be replaced whenever a new production run begins.
  • impression cylinders 3 have to be moved, removed and replaced with others on which the plate for the new job is fitted, after which everything has to be returned to its original position.
  • inking rollers 4 are first moved aside by sliding them along support brackets 6; then the impression cylinders are moved to distance them from support cylinder 2; the locking devices of the supports of each cylinder shaft are removed and extensions are fitted to the shaft; the extensions of the impression cylinder shafts are engaged with the pulleys one at a time, and lifted to disengage them from their seatings; and finally, the pulleys are made to traverse along guide 5 to distance each cylinder from the press, so that it can be replaced with a new one.
  • brackets 6 are inclined in relation to support cylinder 2 to give an open angle towards the exterior as shown in the figure, thus producing more space between the brackets and allowing more room for manoeuvre.
  • brackets 6 must be long enough to allow the inking rollers to be moved far enough away to allow the free movement of impression cylinders 3 during replacement.
  • brackets are only fitted roughly parallel to one another in larger presses, in which support cylinder 2 is very large, and the brackets are therefore far enough apart to allow the impression cylinders to pass between them during replacement.
  • this configuration is solely designed to allow the use of identical inking rollers for all brackets, while removal and replacement of the impression cylinders is still performed with a pulley, which picks up the cylinders from above.
  • robots are used for this operation, but apart from their very high cost, they do not produce any appreciable saving of time, and in any event they still remove the cylinders from above, with all the drawbacks described above.
  • the present invention offers a method and the corresponding equipment for the removal and replacement of the impression cylinders of a flexographic press which uses a carriage with a chassis that slides in a basically vertical direction, supports designed to engage the cylinder shafts from below being built into the said chassis.
  • the said supports are moved under the cylinder shafts, and raise them for a pre-set distance sufficient to disengage the cylinders from their seatings, after which the said supports traverse to remove the cylinders from the press.
  • the structure of a flexographic press which is only partly illustrated in the figure comprises a pair of shoulders 10 constituted by a structure made of steel or the like on which is mounted a cylinder 11, around which the film to be printed, shown as no. 12, runs.
  • Shoulders 10 contain a set of brackets 13, each of which is fitted with a ground guide 14.
  • a characteristic feature of the invention is that the said brackets are parallel to one another; in particular they are roughly horizontal.
  • a printing unit that includes a sliding chassis 15, to which an inking unit 16 is fitted, is mounted on each guide 14.
  • each guide near cylinder 11, there is a support 17 for an impression cylinder 19.
  • Chassis 15 can run along guide 13 driven, for example, by a recirculating-ball screw 18.
  • the inking unit can slide along chassis 15 driven by a second recirculating-ball screw 20.
  • impression cylinder 19 on which the plate is mounted, receives ink from inking roller 16 and prints the sheet that runs over cylinder 11.
  • drying systems 21 which blow hot air onto the printed sheet immediately downstream of the impression cylinders, devices which synchronise the various cylinders (such devices not being illustrated in the figures), etc.
  • Impression cylinders 19 are fitted on a shaft 22 which is inserted into supports 17 and projects from the supports for a short distance on either side.
  • Each support 17 basically consists of a fork with a fixed arm 23 and a second arm 24 hinged to the preceding one so that it can rotate around an axis 25.
  • arm 23 is fixed to the rod of a hydraulic piston 26, and is also subject to the action of a set of Belleville washers 27, which tend to keep arm 24 locked against arm 23, in the closing and locking position of shaft 22.
  • arm 24 When hydraulic piston 26 is activated, arm 24 can be rotated, counteracting the force exerted by springs 27, to open the fork and remove shaft 22 with the cylinder.
  • a carriage of the type illustrated in figure 3 is used for the removal and replacement of impression cylinders 19.
  • This carriage comprises a base 28 with pairs of uprights 29 interconnected by suitable crosspieces 30, a mobile chassis 31 being fitted to the said uprights.
  • Chassis 31 can slide in the vertical direction along uprights 29; the extent of its travel is determined by the length of a slot 32 cut into sliding chassis 31, through which a fixed pin 33 integral with uprights 29 is inserted.
  • the movements are controlled by a hydraulic piston of known type, not illustrated in the figure.
  • Slot 32 is long enough to allow chassis 31 to perform exactly the movement required to raise impression cylinders 19 by the distance necessary to remove them from their seatings and pass them between the corresponding inking roller and the upper bracket.
  • a number of arms 34 are integral with mobile chassis 31; grooved brackets 35, designed to grip and support impression cylinder shafts 22, are fitted to the said arms.
  • the system operates as follows:
  • recirculating-ball screw 18 is activated by sliding the printing assembly along guide 14, so as to distance it from cylinder 11.
  • Recirculating-ball screw 20 is then activated to separate inking unit 16 from cylinder 19, and hydraulic piston 26 (fig. 7) is activated to control the rotation (anticlockwise in the figure) of arm 24, which is part of cylinder support 17.
  • Support 17 opens to allow removal of the cylinder.
  • Suitable guides not illustrated, which ensure exact positioning, will obviously also be fitted at the sides of the route followed by the carriage.
  • the operator can then withdraw the carriage, simultaneously removing all the cylinders, which will then be replaced with new ones, previously prepared on a similar carriage, by repeating the same operations in the reverse order.
  • Bearings 36 are mounted on shafts 22 of cylinders 19 and on one side, on a grooved section of the shaft, a cogwheel 37 engages with the cogwheels that transmit the rotary movement to the cylinder.
  • the invention includes a set of arms 38 (fig.5), hinged to the carriage structure; at the end of the said arms there is a fork 39 or the like, which fits round the bearings and the cogwheel to keep them exactly in position during the movement of the carriage.
  • These arms 38 can be controlled in any known way.
  • a fixed stop schematically shown as no. 40 in figure 3, could be fitted to engage the arm so as to raise it when chassis 31 with the cylinder supports is lowered, and release it, so that the fork moves downwards as a result of its own weight, when chassis 31 is raised to pick up the cylinders.
  • Arms 33 of the pick-up carriage could also be replaced by similar arms, each fitted with two supports, 35 and 35', to allow simultaneous replacement of the impression cylinders and inking rollers if required.
  • the cylinder replacement time is reduced from around two hours to a few minutes, with no risk of damage caused by the difficulty of manoeuvring non-rigid cylinder raising and moving equipment.
  • the lifting gear performs a mechanically predetermined, fixed movement when raising the cylinders firstly makes the operator's task easier, and secondly minimises the distance between brackets 13, thus reducing the overall height of the press.
  • the lifting gear with its rigid structure, makes the cylinders perform precise movements with no oscillations, the travel of the cylinders and the corresponding inking units along the brackets can be limited; the length of the brackets can thus be reduced, with advantages in terms of overall dimensions and greater rigidity of the structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
EP98117085A 1997-09-29 1998-09-10 Ausbau und Austausch von Druckzylindern einer Flexodruckmaschine Withdrawn EP0904936A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97PC000027A IT1296231B1 (it) 1997-09-29 1997-09-29 Metodo e attrezzatura per il prelievo e la sostituzione dei cilindri di stampa di una macchina flessografica, e macchina flessografica
ITPC970027 1997-09-29

Publications (2)

Publication Number Publication Date
EP0904936A2 true EP0904936A2 (de) 1999-03-31
EP0904936A3 EP0904936A3 (de) 1999-12-29

Family

ID=11389264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98117085A Withdrawn EP0904936A3 (de) 1997-09-29 1998-09-10 Ausbau und Austausch von Druckzylindern einer Flexodruckmaschine

Country Status (2)

Country Link
EP (1) EP0904936A3 (de)
IT (1) IT1296231B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10119666A1 (de) * 2001-04-20 2002-10-31 Windmoeller & Hoelscher Fahrbare Vorrichtung sowie Verfahren zum Austausch von Farbwannen und Rakeln
EP1249345A3 (de) * 2001-04-05 2003-12-03 Paper Converting Machine Company Flexodruckmaschine mit integriertem Trockner
JP2013180484A (ja) * 2012-03-01 2013-09-12 Dainippon Printing Co Ltd 圧胴設置治具及び圧胴設置機構

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792781A (en) * 1953-05-14 1957-05-21 Druckmaschinenwerk Victoria Ve Cylinder change mechanism for rotary sheet printing presses
DE2941521A1 (de) * 1979-10-12 1981-04-23 Windmöller & Hölscher, 4540 Lengerich Flexodruckmaschine
FR2485990A1 (fr) * 1980-07-03 1982-01-08 Holweg Const Mec Dispositif pour le changement automatique de cylindres d'une imprimeuse flexographique
DE3517634A1 (de) * 1984-05-17 1985-11-21 Rengo Co., Ltd., Osaka Vorrichtung zum auswechseln von plattenzylindern
WO1994018007A1 (en) * 1993-02-03 1994-08-18 Werner Kammann Maschinenfabrik Gmbh Printing machine with interchangeable parts, and device and method for interchanging parts in such a printing machine
DE4413807C1 (de) * 1994-04-20 1995-09-14 Windmoeller & Hoelscher Vorrichtung zum Wechseln der Zylinder an einer Druckmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792781A (en) * 1953-05-14 1957-05-21 Druckmaschinenwerk Victoria Ve Cylinder change mechanism for rotary sheet printing presses
DE2941521A1 (de) * 1979-10-12 1981-04-23 Windmöller & Hölscher, 4540 Lengerich Flexodruckmaschine
FR2485990A1 (fr) * 1980-07-03 1982-01-08 Holweg Const Mec Dispositif pour le changement automatique de cylindres d'une imprimeuse flexographique
DE3517634A1 (de) * 1984-05-17 1985-11-21 Rengo Co., Ltd., Osaka Vorrichtung zum auswechseln von plattenzylindern
WO1994018007A1 (en) * 1993-02-03 1994-08-18 Werner Kammann Maschinenfabrik Gmbh Printing machine with interchangeable parts, and device and method for interchanging parts in such a printing machine
DE4413807C1 (de) * 1994-04-20 1995-09-14 Windmoeller & Hoelscher Vorrichtung zum Wechseln der Zylinder an einer Druckmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249345A3 (de) * 2001-04-05 2003-12-03 Paper Converting Machine Company Flexodruckmaschine mit integriertem Trockner
US6892639B2 (en) 2001-04-05 2005-05-17 Paper Converting Machine Co. Flexographic printing press with integrated dryer
DE10119666A1 (de) * 2001-04-20 2002-10-31 Windmoeller & Hoelscher Fahrbare Vorrichtung sowie Verfahren zum Austausch von Farbwannen und Rakeln
WO2002085626A1 (de) * 2001-04-20 2002-10-31 Windmöller & Hölscher Kg Vorrichtung sowie verfahren zum austausch von farbwannen und rakeln
JP2013180484A (ja) * 2012-03-01 2013-09-12 Dainippon Printing Co Ltd 圧胴設置治具及び圧胴設置機構

Also Published As

Publication number Publication date
EP0904936A3 (de) 1999-12-29
ITPC970027A0 (it) 1997-09-29
ITPC970027A1 (it) 1999-03-29
IT1296231B1 (it) 1999-06-18

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