EP0306987A2 - Cylindre de clichés pour machine à imprimer rotative - Google Patents

Cylindre de clichés pour machine à imprimer rotative Download PDF

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Publication number
EP0306987A2
EP0306987A2 EP88114809A EP88114809A EP0306987A2 EP 0306987 A2 EP0306987 A2 EP 0306987A2 EP 88114809 A EP88114809 A EP 88114809A EP 88114809 A EP88114809 A EP 88114809A EP 0306987 A2 EP0306987 A2 EP 0306987A2
Authority
EP
European Patent Office
Prior art keywords
printing cylinder
cylinder
jacket
printing
thickenings
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.)
Withdrawn
Application number
EP88114809A
Other languages
German (de)
English (en)
Other versions
EP0306987A3 (fr
Inventor
Giuseppe Fantoni
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.)
Officine Meccaniche Giovanni Cerutti SpA
Original Assignee
Officine Meccaniche Giovanni Cerutti SpA
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 Officine Meccaniche Giovanni Cerutti SpA filed Critical Officine Meccaniche Giovanni Cerutti SpA
Publication of EP0306987A2 publication Critical patent/EP0306987A2/fr
Publication of EP0306987A3 publication Critical patent/EP0306987A3/fr
Withdrawn legal-status Critical Current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
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes

Definitions

  • the above invention relates to a printing cylinder for a rotary printing machine, in which the printing plate is clamped in the form of a cylindrical winding plate on the outer surface of the printing cylinder by expanding a tubular, elastic, thin jacket.
  • the cylinder diameter is increased by acting on the jacket from the inside of a non-compressible liquid which can be controlled by means of displacement devices of the liquid.
  • Cylinders for clamping tubular printing plates rotary printing machines have already become known, e.g. Gravure printing plates, matrices for flexographic printing or for other bodies of a rotary printing machine, such as rubber-like sleeves for pressure cylinders, cylinder-shaped pressure plates for anilox cylinders, coverings for drive cylinders and similar devices.
  • the known displacement device which leads to an increase in the pressure in the liquid and to the expansion of the outer jacket of the cylinder are used, have an actuating screw to generate a compressive force which acts directly on the fluid, in the manner of a piston, often through the intermediate storage of a spring. Due to the machining tolerances of the screw or the threaded pin, as well as the threaded hole in the pressure line, pressure loss can occur, which lead to a change in the fluid pressure and thus cause a change in the outer circumference of the jacket. Furthermore, the disadvantage can arise that the compression is not carried out directly in the axial direction, which leads to further sealing losses and / or greater wear of the components.
  • the use of a spring, together with a separately provided piston requires the installation of three components, the above-mentioned disadvantages not being eliminated.
  • the pressure plate or possibly the sleeve-like, tubular casing on the pressure cylinder must be arranged with high accuracy in the axial direction of the cylinder before the cylinder is expanded, in order to avoid undesired displacements in the transverse direction.
  • the edge areas of the known printing plate have sharp edges or edges angled by 90 °, which would adversely affect the operation of a doctor blade, i.e. that component which is provided in order to remove the excess ink and which moves with a reciprocating movement in the longitudinal direction of the printing cylinder.
  • the doctor blade is not only impaired in its oscillating movement and in its mode of operation, but it is also subject to greater wear.
  • this known type of plate is particularly advantageous in terms of the manufacturing costs of the plate, both in terms of the necessary devices as well as the time required for galvanic treatment and the etching of these plates.
  • the known advantages cannot be fully used, since a thickening forms at the connection joint, on the inside of the cylindrical printing plate, due to the technical circumstances described, which occur due to the mutual connection of the plate edges of these printing plates.
  • the object of the above invention is to avoid the disadvantages of the prior art and the associated restrictions.
  • a printing cylinder for a rotary printing press which has a tubular, elastic, thin jacket which is firmly and tightly connected to the ends of the cylinder body and has peripheral chambers in which a non-compressible liquid is provided and with devices for displacing the liquid, in order to bring about an enlargement of the outer circumference of the pressure cylinder and the printing cylinder is characterized in that the displacement device consists of a threaded pin which is screwed into a line which is operatively connected to the liquid chambers and which The grub screw has a receptacle at its end, which is operatively connected to a head-like thickening of a piston, and the piston has ring grooves at its other end for receiving sealing rings.
  • the ends of the tubular jacket surface have material thickenings, in order thereby to create a seat or a recess for the arrangement of the pressure plate, the thickness of the thickening being equal to the thickness of the pressure plate, and the outer edges of the thickening are also included round off.
  • the jacket surface of the cylinder has at least one longitudinal groove or a longitudinal seat in order to form a receptacle and holder for the connecting joint of the pressure plate, which consists of a wound plate that is joined at the end.
  • the printing cylinder according to the invention which is shown in its basic features in FIG. 1 and is identified by the reference symbol 1, has two lateral bearing journals 2 and 3 for storage in the rotary printing press.
  • circumferential chambers 5 are incorporated, which are relatively flat. These chambers 5 are filled with a non-compressible liquid 11 and connected to the outside of the cylinder via a line 7. In the line 7, from the outside 8 of the cylinder, displacement devices are inserted, which are schematically identified by 9 and are described in more detail below. In the case of pressure cylinders with a short length, it may be sufficient to provide a single circumferential chamber 5.
  • the body 4 of the cylinder is covered by a cylindrical, tubular, thin jacket 12 which e.g. consists of spring steel or is made of plastic or other suitable materials.
  • This elastic jacket 12 is fixed and sealed to the ends of the cylinder 1, e.g. by welding connection or other suitable connection possibilities, which are marked with 13.
  • the pressure plate is pushed over the mantal 12. This pressure plate can freely on the tubular jacket be moved when the liquid 11 is not under pressure. Once the tubular pressure plate is positioned on the cylinder 1, the liquid 11 is pressurized via the displacement device 9, and the outer diameter of the cylinder increases due to the elasticity of the casing 11. The pressure plate is thus uniformly distributed over the entire cylinder surface in a predetermined position curious; excited.
  • the displacement device 9 of the invention will now be described in more detail with reference to FIGS. 2-4a.
  • the displacement device 9 consists of a movable piston 20 which is displaceably mounted in the longitudinal direction in the line 7 and has a head 25 at one end and is provided at the other end with annular grooves 28 for receiving sealing rings 24.
  • the piston 20 is operatively connected to a drive part 21, advantageously a grub screw 21, but is not rigidly connected to it.
  • the setscrew 21 has a shape 22 for the insertion of a key.
  • the pin has a thread 29 which is operatively connected to a thread 23 towards the outward exit of the line 7.
  • the receiving seat 26 (FIGS. 4 - 4a) of the threaded pin 20 is suitable for receiving the head 25 of the piston 20.
  • the head is over one Taper 27 of the piston is guided in a tapered receptacle 30 of the threaded pin 21.
  • the head 25 of the piston is arranged in the seat 26 with a certain play. This compensates for forces that do not occur exactly in the axial direction.
  • the displacement device becomes particularly precise and efficient in its operation. Any tolerances that occur during the production of the threaded pin 21 or the thread in the line 7 do not influence the sealing effect of the device. Furthermore, no loads will occur due to an axial deviation of the components, since there is no rigid connection between the piston head 25 and the threaded pin 21.
  • the proposed design is particularly simple. The parts can be easily assembled and there is the possibility of easily replacing individual components.
  • the outer surface 35 of the casing 12 has a thickening at one end or at both ends 32 (only the left end piece is shown in the figure) compared to the remaining material of the casing 12. This creates a seat or a seat for the pressure plate.
  • the receptacle consists of the jacket 35 and stops 31, which are formed by the thickening 32.
  • the depth of the seat or the seat is equal to the thickness of the pressure plate to be used, which was not shown in the drawing for reasons of clarity. This ensures that when a printing plate is mounted on the cylinder 1, in accordance with the receiving seat, the outer edge zone of the printing plate comes to lie flush with the outer surface 32 of the thickening.
  • the receptacle for the printing plate was produced by mechanical processing of the casing 12 and has a circumferential groove 34, which, however, has no effect on the function of the cylinder. Alternatively, the material could also be removed chemically or electrochemically.
  • the squeegee for the removal of the excess printing ink which moves back and forth and parallel to the cylinder 1, does not detect any interruption in the cylinder surface.
  • the squeegee no longer hits an edge that is sharply deflected by 90 °, which is unavoidable with conventional winding plates.
  • the seat can also be formed from two laterally arranged thickenings 40 which have covering parts 42 which rest on the cylinder end, which has a smaller diameter, in order to form a projection with respect to the surface 45 of the casing , which corresponds to the thickness of the printing plate.
  • the outer edge 43 is also rounded here, and the component 40 can be attached to the jacket by means of screws, adhesive connection, welding or similar connecting means.
  • these thickenings are made of a material whose characteristics are similar to the characteristics of the photosensitive coating material which forms the outer surface of the printing plate. Features that should be similar relate to the coefficient of friction and hardness of the material to avoid any interruption in the continuity of the squeegee movement.
  • the pressure plate is designed as a closed sleeve or as an assembled sleeve with a continuous profile, both in the circumferential direction and in the radial direction, the surface (35, 45) of the jacket appears continuously.
  • the jacket 12 of the cylinder has at least one recess or longitudinal groove, such as this is shown in different execution examples in FIGS. 6-10.
  • the recess 50 shown in FIG. 6 extends in the longitudinal direction along a surface line of the surface 12 and has a depth that is greater than its width. This recess is kept somewhat wider than the width dimension of the bend, so that it is easy to insert into the recess.
  • the groove-like recess extends in the radial direction.
  • the groove 50 could also extend inclined to the surface line of the surface 12, in the event that the butt joint of the pressure plate would be provided inclined relative to the surface, usually along a slightly inclined angle in order to reduce the usable area for the surface too much Have to put up with the printing process.
  • the slit-like opening 51 has a small depth, but its width is considerably larger than its depth.
  • This type of recess is suitable for receiving and fixing a pressure plate in which the butt joint has been bent over, so as to limit the thickness of the butt joint to a minimum. With this groove, the depth is less Admission required and thus there is a very slight weakening of the jacket.
  • Fig. 8 shows an embodiment in which the groove-like recess 52 is angled with respect to the radial direction of the cylinder and corresponds to an abutment point in which the plate joints are not arranged at 90 ° relative to the pressure plate surface and have not been completely bent. In this way, a depth for the recess is achieved which is less than the actual height of the butt joint, without having to resort to a complete bending of the butt joints.
  • the choice of groove type depends on various factors, including from the thickness of the cylinder jacket, thickness that can reach up to 10 mm.
  • FIG. 9 shows a further embodiment, in which at least one slot 53 for receiving the connection point and a further number of slots or incisions 54, which are distributed over the outer surface of the jacket 12, are provided. These latter slots have a compensating function and serve mainly to avoid the formation of an oval circumference and / or to reduce peak loads.
  • the incisions can be covered by elastic sleeves made of steel or plastic as required.
  • FIG. 10 shows a further embodiment, in which the groove for receiving the connecting joint is identified by 56.
  • Another notch 57 is arranged in an inclined position with respect to the first groove and a third groove 58 is in the opposite one Side provided on the inside of the jacket 12.
  • a plurality of grooves can also be provided for receiving the connection joint of the pressure plate, and the groove or the grooves can be arranged inclined with respect to the surface lines of the peripheral shell if the connection point of the pressure plate is arranged inclined.
  • the provision of a recess or a seat in the circumferential direction of the printing plate makes it possible to create a smooth printing surface without interruptions, which considerably simplifies the doctoring process, also thanks to the rounding of the outer edges.
  • the provision of one or more longitudinal grooves creates the possibility of also using pressure plates which are designed as winding plates, in which the thickness of the butt joint is not to be neglected.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP88114809A 1987-09-11 1988-09-09 Cylindre de clichés pour machine à imprimer rotative Withdrawn EP0306987A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21899/87A IT1222651B (it) 1987-09-11 1987-09-11 Cilindro di stampa per macchine da stampa rotative
IT2189987 1987-09-11

Publications (2)

Publication Number Publication Date
EP0306987A2 true EP0306987A2 (fr) 1989-03-15
EP0306987A3 EP0306987A3 (fr) 1990-04-11

Family

ID=11188433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114809A Withdrawn EP0306987A3 (fr) 1987-09-11 1988-09-09 Cylindre de clichés pour machine à imprimer rotative

Country Status (3)

Country Link
US (1) US4934266A (fr)
EP (1) EP0306987A3 (fr)
IT (1) IT1222651B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2705278A1 (fr) * 1993-05-13 1994-11-25 Roland Man Druckmasch Dispositif de repérage pour une forme d'impression offset du type manchon.
FR2789626A1 (fr) * 1999-02-12 2000-08-18 Jean Francille Dispositif d'obturation de trous de passage d'air dans un cylindre, notamment pour les cylindres supports et les manchons de compensation
DE102013101066A1 (de) * 2013-02-01 2014-08-07 Inometa Gmbh & Co. Kg Rotationszylinder
ITUB20160533A1 (it) * 2016-02-02 2017-08-02 Trelleborg Coated Systems Italy S P A Metodo per realizzare su una manica per stampa flessografica una guida per la posa e il taglio di un cliché e/o di uno strato biadesivo interposto tra la manica ed il cliché

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257746B3 (de) † 2002-12-10 2004-06-24 Man Roland Druckmaschinen Ag Formzylinder einer Rotationsdruckmaschine, insbesondere einer Offsetdruckmaschine
DE4106062C1 (fr) * 1991-02-27 1992-06-04 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE9310649U1 (de) * 1993-06-18 1993-09-16 Hanosek, Peter, 75236 Kämpfelbach Vorrichtung zum Waschen und Trocknen von Druckplatten
DE4447124C1 (de) * 1994-12-29 1996-02-08 Koenig & Bauer Albert Ag Zylinder einer Rotationsdruckmaschine
IT1277167B1 (it) * 1995-03-20 1997-11-05 Rossini Erminio Spa Perfezionamenti ai mandrini deformabili per cilindri da stampa rotativa
US5819657A (en) * 1996-03-11 1998-10-13 Ermino Rossini, Spa Air carrier spacer sleeve for a printing cylinder
US6161478A (en) * 1999-11-02 2000-12-19 The Holdrite Co., Inc. Printing cylinder assembly
DE10352817A1 (de) * 2003-11-12 2005-06-23 Schepers Gmbh Zylindrischer Träger für die Aufnahme einer auswechselbaren Druckhülse und Verfahren zur Herstellung des Trägers
FR2889674B1 (fr) * 2005-08-09 2007-09-14 Goss Int Montataire Sa Manchon d'adaptation, ensemble et procede de montage correspondants
DK177831B1 (da) * 2013-02-18 2014-09-01 Tresu As Anti bouncing trykvalse/sleeve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952205A (en) * 1957-05-07 1960-09-13 Monarch Marking Systems Inc Printing cylinder for marking machines
US3378902A (en) * 1966-07-05 1968-04-23 Mosstype Corp Hydraulically actuated demountable printing cylinders
DE2409456C3 (de) * 1974-02-27 1978-09-21 Gruner + Jahr Ag & Co, 2210 Itzehoe Tiefdruckformzylinder
US4114378A (en) * 1976-10-20 1978-09-19 Midland-Ross Corporation Rod and piston connection for hydraulic devices
US4656942A (en) * 1977-12-27 1987-04-14 Stork Brabant B.V. Printing apparatus utilizing flexible metal sleeves as ink transfer means
US4381709A (en) * 1980-06-13 1983-05-03 Robert Katz Printing roller with removable cylinder
GB2137140B (en) * 1983-03-10 1986-03-26 Mosstype Corp Printing cylinders

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2705278A1 (fr) * 1993-05-13 1994-11-25 Roland Man Druckmasch Dispositif de repérage pour une forme d'impression offset du type manchon.
FR2789626A1 (fr) * 1999-02-12 2000-08-18 Jean Francille Dispositif d'obturation de trous de passage d'air dans un cylindre, notamment pour les cylindres supports et les manchons de compensation
DE102013101066A1 (de) * 2013-02-01 2014-08-07 Inometa Gmbh & Co. Kg Rotationszylinder
DE102013101066B4 (de) * 2013-02-01 2018-04-12 Inometa Gmbh & Co. Kg Rotationszylinder
ITUB20160533A1 (it) * 2016-02-02 2017-08-02 Trelleborg Coated Systems Italy S P A Metodo per realizzare su una manica per stampa flessografica una guida per la posa e il taglio di un cliché e/o di uno strato biadesivo interposto tra la manica ed il cliché
WO2017134082A1 (fr) * 2016-02-02 2017-08-10 Trelleborg Coated Systems Italy S.P.A. Procédé de réalisation sur un manchon d'impression flexographique d'un guide pour poser et couper un cliché et/ou une couche bi-adhésive interposée entre le manchon et le cliché

Also Published As

Publication number Publication date
IT8721899A0 (it) 1987-09-11
US4934266A (en) 1990-06-19
EP0306987A3 (fr) 1990-04-11
IT1222651B (it) 1990-09-05

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