EP2217442A2 - Cylinder for offset printing machines provided with abutment rings - Google Patents

Cylinder for offset printing machines provided with abutment rings

Info

Publication number
EP2217442A2
EP2217442A2 EP08847631A EP08847631A EP2217442A2 EP 2217442 A2 EP2217442 A2 EP 2217442A2 EP 08847631 A EP08847631 A EP 08847631A EP 08847631 A EP08847631 A EP 08847631A EP 2217442 A2 EP2217442 A2 EP 2217442A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
printing
rigid abutment
abutment rings
rings
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Withdrawn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
EP08847631A
Other languages
German (de)
French (fr)
Inventor
Amerigo Manzini
Angelo Bartesaghi
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.)
Omet SRL
Original Assignee
Omet SRL
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 Omet SRL filed Critical Omet SRL
Publication of EP2217442A2 publication Critical patent/EP2217442A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/04—Rotary letterpress machines for printing on webs
    • 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
    • B41F13/21—Bearer rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/22—Rotary letterpress machines for indirect printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/80—Means enabling or facilitating exchange of cylinders

Definitions

  • the present invention refers to a cylinder which can be used in particular but not exclusively on printing machines of so-called offset type.
  • offset printing is an indirect printing technique mainly based on the same principle as lithography.
  • An offset printing machine normally provides for a series of separate groups, which allow carrying out the printing on the related support, usually composed of a thin continuous strip of paper or another analogous material .
  • the offset printing occurs through the use of three cylinders in contact with each other.
  • a first cylinder bears a wound print plate or cliche, which is wet by a plurality of ink rollers and possibly humidifiers placed in contact with the first cylinder itself.
  • a second intermediate or transfer cylinder covered in rubber, caoutchouc, or with other similar elastomer materials, receives the print and brings it on the strip, made to turn by the third cylinder, or opposing print cylinder.
  • the maximum outer diameter of the cylinders in particular of the pair constituted by the plate-bearing cylinder and by the rubberised transfer cylinder, is determined in order to define the extension of the printable format, given that every printout can have a maximum length equal to the extension of the lateral surface of the aforesaid pair of cylinders .
  • Offset printing machines were then made in which the plate-bearer and transfer cylinders are constituted by sleeves of variable thickness, axially insertable around rotating pins made integral with the machine itself. In the case of variation of the print formats, it is therefore sufficient to extract the sleeves from the related support pins and to substitute them with those of sizes adapted for the printing of the desired format, without necessarily having to disassemble entire parts of the printing machine.
  • the object of the present invention is therefore that of making a cylinder for printing machines of offset type that is capable of ensuring, in operating conditions, suitable relative pressures with respect to the other cylinders of the machine, without requiring the presence of complicated and costly pressure control and adjustment means.
  • Another object of the invention is that of making a printing machine of offset type which is easily interchangeable, avoiding the disassembly of entire parts of the machine every time it is required to change the printing formats.
  • Figure 1 is a side elevation view, entirely schematic, of the essential elements which compose a generic offset printing machine
  • Figure 2 is a section view of a first embodiment of a cylinder for offset printing machines according to the present invention
  • Figure 3 is a detailed view of a detail of figure 2;
  • Figure 4 is a section view of a second embodiment of a cylinder for offset printing machines according to the present invention
  • Figure 5 is a detailed view of a detail of figure 4
  • Figure 6 is a partial section view which shows the cylinder of figure 2 in its mounting step on the printing machine
  • Figure 7 is a partial section view which shows the cylinder of figure 4 in its mounting step on the printing machine.
  • the machine comprises a series of ink rollers 10 adapted to draw the ink from a tank (not shown) , the ink rollers 10 being provided with rotation movement means 12.
  • Such ink rollers 10 meter the ink and transfer it onto a first printing cylinder 14, or plate-bearing cylinder, which in turn transfers the print onto a second printing cylinder 16, or rubberised transfer cylinder, placed in contact with the plate- bearing cylinder 14 itself.
  • the print is then finally transferred by the rubberised cylinder 16 to a strip- like support 18 advancing on the machine, pushed against the rubberised transfer cylinder 16 by an opposing cylinder 20.
  • One or more movement and return rollers 22 can be provided for the strip-like support 18.
  • the plate-bearing cylinder 14 and/or the rubberised transfer cylinder 16 are of hollow type
  • each sleeve on the relative mandrel 24 occurs, in a per se known manner, by means of the use of compressed air or with other systems of mechanical type (not shown) .
  • the plate-bearing cylinder 14 and/or rubberised transfer cylinder 16 are provided, at at least one of their lateral ends, with one or more rigid shoulder or abutments rings 26, visible in section in figures 2-7.
  • Each ring 26 is mounted on the respective cylinder 14 and/or 16 by means of the interposition of one or more rolling bearings 28 which allow the rings 26 themselves to remain stopped, or to rotate with different speeds, during the rotation of the mandrel 24 and the cylinder 14 and/or 16 mounted thereon .
  • each ring 26 can be identical or slightly different, in the present or case greater or less than the overall diameter of the printing cylinder 14, 16 on which each ring 26 is mounted.
  • overall diameter it is intended the diameter of the cylinder 14, 16 in operative configuration, i.e. mounted on the related mandrel 24 and provided with outer casing 30 composed, according to the type of use, by the print plate or by the rubberised coating (caoutchouc) .
  • the rolling bearings 28 which support and render the rings 26 rotatably independent with respect to the cylinder 14, 16 can be either directly fixed on the surface of the cylinder 14, 16 itself, inside suitable cavities 32 (figures 4 and 5) provided on its outer surface, or they can be made integral with flanges 34 in turn rigidly fixed, for example by means of bolts 36, on the outer surface of the related cylinder 14, 16, inside or not inside the cavities 32.
  • the abutment rings 26 can therefore be used, if mounted for example on the first printing or plate-bearing cylinder 14, as reference for the work position of the ink rollers 10, which are simply arranged in abutment on the rings 26 themselves when the printing machine is in motion, independent of the diameter of the cylinder and without requiring the presence of the sensor means for controlling the relative pressure between the cylinder 14 and the ink rollers 10.
  • the same abutment rings 26 can also be set on the second rubberised printing cylinder 16. In such case, the rings 26 of the rubberised cylinder 16 are prearranged for abutting against the corresponding rings 26 provided on the plate-bearing cylinder 14. Therefore, in addition to defining the mutual distance between the two printing cylinders 14 and 16, the pairs of opposing rings 26 also support, in this specific configuration, the printing pressures existing between the rubberised cylinder 16 and the opposing cylinder 20.
  • the plate-bearer cylinder 14 provided with the rings 26 mounted on the bearings 28 can be inserted in an offset printing machine where the rubberised cylinder 16 is either of traditional type, i.e. made with sleeve or not but without abutment rings 26, or of the type in turn provided with the end rings 26 fixed in an integral manner, by means of the interposition of rolling bearings 28, to the sleeve bearing the caoutchouc coating 30. It has thus been observed that the cylinder for offset printing • machines according to the present invention achieves the objects stated above.
  • an offset printing machine allows both easily-determining the relative pressures between the different printing cylinders and/or ink rollers, without having to provide appropriate sensor means, and providing a reference for its work position and for that of the cylinders and/or rollers with which it is in contact, also in the case of variation of the diameters of such cylinders .
  • the cylinder for printing machines of offset type according to the present invention thus conceived is in any case susceptible to numerous modifications and variants, all part of the same inventive concept; moreover, all details can be substituted with technically equivalent elements, while the shapes and sizes can be of any type according to the technical requirements .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Paper (AREA)

Abstract

A cylinder (14) is described for a printing machine of the type comprising at least one first printing cylinder (14), placed in contact with at least, one opposing cylinder, at least one second printing cylinder, placed in contact with the first printing cylinder (14), and a plurality of ink rollers, placed in contact with the first printing cylinder (14). The cylinder (14) is provided, at least one of its lateral ends, with one or more rigid abutment rings (26), each of such rigid abutment rings (26) being mounted on the cylinder (14) by means of the interposition of one or more rolling bearings (28) which allow the rigid abutment rings (26) to remain stopped, or to rotate with different speeds, during the rotation of the cylinder (14) around its own axis (A).

Description

CYLINDER FOR OFFSET PRINTING MACHINES
The present invention refers to a cylinder which can be used in particular but not exclusively on printing machines of so-called offset type. As is known, offset printing is an indirect printing technique mainly based on the same principle as lithography. An offset printing machine normally provides for a series of separate groups, which allow carrying out the printing on the related support, usually composed of a thin continuous strip of paper or another analogous material .
Essentially, the offset printing occurs through the use of three cylinders in contact with each other. A first cylinder bears a wound print plate or cliche, which is wet by a plurality of ink rollers and possibly humidifiers placed in contact with the first cylinder itself. A second intermediate or transfer cylinder, covered in rubber, caoutchouc, or with other similar elastomer materials, receives the print and brings it on the strip, made to turn by the third cylinder, or opposing print cylinder.
It is therefore clear that the maximum outer diameter of the cylinders, in particular of the pair constituted by the plate-bearing cylinder and by the rubberised transfer cylinder, is determined in order to define the extension of the printable format, given that every printout can have a maximum length equal to the extension of the lateral surface of the aforesaid pair of cylinders .
In traditional offset printing machines, every time a print change was required for different products, the substitution was necessary of the entire cylinder group, with consequent machine stopping and long dead times, as well as considerable costs due to the immobilisation of the cylinder pairs not in use. Offset printing machines were then made in which the plate-bearer and transfer cylinders are constituted by sleeves of variable thickness, axially insertable around rotating pins made integral with the machine itself. In the case of variation of the print formats, it is therefore sufficient to extract the sleeves from the related support pins and to substitute them with those of sizes adapted for the printing of the desired format, without necessarily having to disassemble entire parts of the printing machine. In order for the printing process with the new format cylinder to be correctly carried out, it is however necessary that the machine is equipped with suitable means which control that the relative pressures between the various cylinders always remain inside predefined intervals. The presence of such pressure sensor means considerably increases the manufacturing costs of the printing machine.
The object of the present invention is therefore that of making a cylinder for printing machines of offset type that is capable of ensuring, in operating conditions, suitable relative pressures with respect to the other cylinders of the machine, without requiring the presence of complicated and costly pressure control and adjustment means. Another object of the invention is that of making a printing machine of offset type which is easily interchangeable, avoiding the disassembly of entire parts of the machine every time it is required to change the printing formats. These objects, according to the present invention, are achieved by making a cylinder for printing machines, in particular but not exclusively for printing machines of offset type, as set forth in claim 1.
Further characteristics of the invention are highlighted by the following claims . The characteristics and advantages of a cylinder for printing machines of offset type according to the present invention will be clearer from the following illustrative and non- limiting description, referred to the attached schematic drawings, in which: Figure 1 is a side elevation view, entirely schematic, of the essential elements which compose a generic offset printing machine;
Figure 2 is a section view of a first embodiment of a cylinder for offset printing machines according to the present invention; Figure 3 is a detailed view of a detail of figure 2;
Figure 4 is a section view of a second embodiment of a cylinder for offset printing machines according to the present invention; Figure 5 is a detailed view of a detail of figure 4; Figure 6 is a partial section view which shows the cylinder of figure 2 in its mounting step on the printing machine; and
Figure 7 is a partial section view which shows the cylinder of figure 4 in its mounting step on the printing machine.
With reference in particular to figure 1, the essential elements composing a generic offset printing machine are shown in an entirely schematic manner. In particular, the machine comprises a series of ink rollers 10 adapted to draw the ink from a tank (not shown) , the ink rollers 10 being provided with rotation movement means 12. Such ink rollers 10 meter the ink and transfer it onto a first printing cylinder 14, or plate-bearing cylinder, which in turn transfers the print onto a second printing cylinder 16, or rubberised transfer cylinder, placed in contact with the plate- bearing cylinder 14 itself.
The print is then finally transferred by the rubberised cylinder 16 to a strip- like support 18 advancing on the machine, pushed against the rubberised transfer cylinder 16 by an opposing cylinder 20. One or more movement and return rollers 22 can be provided for the strip-like support 18.
In particular, according to the illustrated embodiments, the plate-bearing cylinder 14 and/or the rubberised transfer cylinder 16 are of hollow type
(figures 2 and 4), i.e. being made in the form of sleeves axially inserted around a pin or mandrel 24 belonging to the printing machine and placed in rotation around its own axis A with respect thereto . The locking of each sleeve on the relative mandrel 24 occurs, in a per se known manner, by means of the use of compressed air or with other systems of mechanical type (not shown) . According to the invention, the plate-bearing cylinder 14 and/or rubberised transfer cylinder 16 are provided, at at least one of their lateral ends, with one or more rigid shoulder or abutments rings 26, visible in section in figures 2-7. Each ring 26 is mounted on the respective cylinder 14 and/or 16 by means of the interposition of one or more rolling bearings 28 which allow the rings 26 themselves to remain stopped, or to rotate with different speeds, during the rotation of the mandrel 24 and the cylinder 14 and/or 16 mounted thereon .
The outer diameter of each ring 26 can be identical or slightly different, in the present or case greater or less than the overall diameter of the printing cylinder 14, 16 on which each ring 26 is mounted. By overall diameter, it is intended the diameter of the cylinder 14, 16 in operative configuration, i.e. mounted on the related mandrel 24 and provided with outer casing 30 composed, according to the type of use, by the print plate or by the rubberised coating (caoutchouc) . The rolling bearings 28 which support and render the rings 26 rotatably independent with respect to the cylinder 14, 16 can be either directly fixed on the surface of the cylinder 14, 16 itself, inside suitable cavities 32 (figures 4 and 5) provided on its outer surface, or they can be made integral with flanges 34 in turn rigidly fixed, for example by means of bolts 36, on the outer surface of the related cylinder 14, 16, inside or not inside the cavities 32. The abutment rings 26 can therefore be used, if mounted for example on the first printing or plate-bearing cylinder 14, as reference for the work position of the ink rollers 10, which are simply arranged in abutment on the rings 26 themselves when the printing machine is in motion, independent of the diameter of the cylinder and without requiring the presence of the sensor means for controlling the relative pressure between the cylinder 14 and the ink rollers 10. The same abutment rings 26 can also be set on the second rubberised printing cylinder 16. In such case, the rings 26 of the rubberised cylinder 16 are prearranged for abutting against the corresponding rings 26 provided on the plate-bearing cylinder 14. Therefore, in addition to defining the mutual distance between the two printing cylinders 14 and 16, the pairs of opposing rings 26 also support, in this specific configuration, the printing pressures existing between the rubberised cylinder 16 and the opposing cylinder 20.
Thus, the plate-bearer cylinder 14 provided with the rings 26 mounted on the bearings 28 can be inserted in an offset printing machine where the rubberised cylinder 16 is either of traditional type, i.e. made with sleeve or not but without abutment rings 26, or of the type in turn provided with the end rings 26 fixed in an integral manner, by means of the interposition of rolling bearings 28, to the sleeve bearing the caoutchouc coating 30. It has thus been observed that the cylinder for offset printing • machines according to the present invention achieves the objects stated above. In particular, its use on an offset printing machine allows both easily- determining the relative pressures between the different printing cylinders and/or ink rollers, without having to provide appropriate sensor means, and providing a reference for its work position and for that of the cylinders and/or rollers with which it is in contact, also in the case of variation of the diameters of such cylinders . The cylinder for printing machines of offset type according to the present invention thus conceived is in any case susceptible to numerous modifications and variants, all part of the same inventive concept; moreover, all details can be substituted with technically equivalent elements, while the shapes and sizes can be of any type according to the technical requirements .
The protective scope of the invention is therefore defined by the attached claims.

Claims

1. Cylinder (14, 16) for a printing machine of the type comprising at least one first printing cylinder (14) , placed in contact with at least one opposing cylinder (20) , at least one second printing cylinder
(16) , placed in contact with said first printing cylinder (14) , and a plurality of ink rollers (10) , placed in contact with said first printing cylinder
(14) , characterized in that it is provided, at at least one of its lateral ends, with one or more rigid abutment rings (26) , each of said rigid abutment rings (26) being mounted on said cylinder (14, 16) by means of the interposition of one or more rolling bearings (28) which allow said rigid abutment rings (26) to remain stopped, or to rotate with different speeds, during the rotation of said cylinder (14, 16) around its own axis (A) .
2. Cylinder (14, 16) according to claim 1, characterised in that it is made in the form of a sleeve that is axially insertable around a pin (24) belonging to said printing machine and placed in rotation around said axis (A) with respect to said printing machine.
3. Cylinder (14, 16) according to claim 2, characterised in that said sleeve is provided with an outer casing (30) constituted by a print plate or by a rubberised coating.
4. Cylinder (14, 16) according to any one of the claims 1-3, characterised in that the outer diameter of each of said rigid abutment rings (26) is identical to the overall diameter of said cylinder (14, 16) on which said rigid abutment ring (26) is mounted.
5. Cylinder (14, 16) according to any one of the claims 1-3, characterised in that the outer diameter of each of said rigid abutment rings (26) is greater than the overall diameter of said cylinder (14, 16) on which said rigid abutment ring (26) is mounted.
6. Cylinder (14, 16) according to any one of the claims 1-3, characterised in that the outer diameter of each of said rigid abutment rings (26) is less than the overall diameter of said cylinder (14, 16) on which said rigid abutment ring (26) is mounted.
7. Cylinder (14, 16) according to any one of the claims 1-6, characterised in that said one or more rolling bearings (28) , which support and render said rigid abutment rings (26) rotatab'ly independent with respect to said cylinder (14, 16), are directly fixed on the surface of said cylinder (14, 16) , inside suitable cavities (32) provided on the outer surface of said cylinder (14, 16) .
8. Cylinder (14, 16) according to any one of the claims 1-6, characterised in that said one or more rolling bearings (28) which support and render said rigid abutment rings (26) rotatably independent with respect to said cylinder (14, 16) are made integral with flanges (34) which are rigidly fixed on the outer surface of said cylinder (14, 16) .
EP08847631A 2007-11-07 2008-10-21 Cylinder for offset printing machines provided with abutment rings Withdrawn EP2217442A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20072133 ITMI20072133A1 (en) 2007-11-07 2007-11-07 CYLINDER FOR OFFSET TYPE PRINTING MACHINES
PCT/IB2008/002843 WO2009060274A2 (en) 2007-11-07 2008-10-21 Cylinder for offset printing machines provided with abutment rings

Publications (1)

Publication Number Publication Date
EP2217442A2 true EP2217442A2 (en) 2010-08-18

Family

ID=40314685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08847631A Withdrawn EP2217442A2 (en) 2007-11-07 2008-10-21 Cylinder for offset printing machines provided with abutment rings

Country Status (3)

Country Link
EP (1) EP2217442A2 (en)
IT (1) ITMI20072133A1 (en)
WO (1) WO2009060274A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1401510B1 (en) * 2010-08-03 2013-07-26 Nuova Gidue S R L IMPROVED PRINTING GROUP, PARTICULARLY FOR FLEXOGRAPHIC PRINTS WITH REMOVABLE PRINTING CYLINDER.
US20200095082A1 (en) * 2018-09-20 2020-03-26 Roto-Die Company, Inc. Coated, Grooved Roll for Converting Line

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724331A (en) * 1953-09-03 1955-11-22 H H Heinrich Inc Cylinder bearers for rotary printing presses
US3732814A (en) * 1971-12-15 1973-05-15 Rockwell International Corp Bearer arrangement for offset printing press
EP1440800A2 (en) * 1999-01-18 2004-07-28 Koenig & Bauer Aktiengesellschaft Rotary printing machine cylinder drive
EP1754601A1 (en) * 2005-08-15 2007-02-21 Müller Martini Holding AG Printing unit for a printing machine, with bearer rings on exchangeable cylinders
ES1065654Y (en) * 2006-07-27 2008-01-16 Rotatek S A CYLINDER WITH BEARING RINGS FOR OFFSET PRINTING MACHINES

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009060274A2 *

Also Published As

Publication number Publication date
WO2009060274A3 (en) 2009-07-02
ITMI20072133A1 (en) 2009-05-08
WO2009060274A2 (en) 2009-05-14

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