WO1997025208A1 - Mandrin de cylindre d'impression pour manchons servant de forme d'impression - Google Patents

Mandrin de cylindre d'impression pour manchons servant de forme d'impression Download PDF

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Publication number
WO1997025208A1
WO1997025208A1 PCT/US1996/000358 US9600358W WO9725208A1 WO 1997025208 A1 WO1997025208 A1 WO 1997025208A1 US 9600358 W US9600358 W US 9600358W WO 9725208 A1 WO9725208 A1 WO 9725208A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular cylinder
mandrel
image carrier
circumferential
axially
Prior art date
Application number
PCT/US1996/000358
Other languages
English (en)
Inventor
Werner Schulz
Original Assignee
Werner Schulz
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
Priority to US08/317,635 priority Critical patent/US5481975A/en
Priority claimed from US08/317,635 external-priority patent/US5481975A/en
Application filed by Werner Schulz filed Critical Werner Schulz
Priority to PCT/US1996/000358 priority patent/WO1997025208A1/fr
Priority to AU48968/96A priority patent/AU4896896A/en
Publication of WO1997025208A1 publication Critical patent/WO1997025208A1/fr

Links

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

  • This invention relates to a new and improved printing roller or cylinder and, more particularly, to the type of cylinder having a hydraulically-actuated expandable mandrel to hold and frictionally grip non-expandable image carrier sleeves of selectable dimension or thickness.
  • a printing cylinder is utilized for the purpose of carrying the inked image or print for the printing operation.
  • the ink is transferred from a cylindrical surface or cylinder to the paper surface that runs between an aligned impression roller and the printing cylinder.
  • the printing cylinder is used to support a cylindrical sleeve ⁇ like printing plate, which may be either flexible or rigid and the printing cylinder is designed to be rotatively mounted in a printing press or machine.
  • Flexographic printing uses similar inks, however, the ink is deposited onto a rubber printing plate or sleeve mounted to a cylinder.
  • Lithography uses a thin image carrier plate, held onto the cylinder with a complicated gripper system that is embedded into the cylinder as is the transfer blanket. Thus a non ⁇ printing gap is necessary and interlocking printing designs with 360° coverage is impossible.
  • a common method of changing printing cylinders is through the use of heat, wherein the cylinders are first heated and then allowed to cool and shrink onto the journals at their ends, thereby forming a frictional fit between the rotating journals and printing cylinder carried thereon.
  • heat is applied to the journal cylinder interface allowing expansion of the cylinder to permit the cylinder to be removed from the journal.
  • One method to eliminate the heating process for removing printing rollers from the mandrel is disclosed in U.S. Patent No. 3,378,902 issued April 23, 1978 to Rolf Hoexter. This method is a relatively complex, expensive and difficult system for forming thin-walled pressure plates to carry a radial pressure outwardly to fix the printing cylinder at its spaced end sections to the mandrel by means of two outer collars.
  • the adapters are formed of annular members which are slidable over each end journal of a multi-piece mandrel and lockable thereto.
  • the adapters each have an outwardly expandable external periphery for gripping and holding a printing cylinder of a diameter larger than that of the mandrel.
  • the present invention provides a relatively inexpensive, easy to use system which substantially solves many of the above noted prior art recognized problems and, in addition, incorporates structural simplicity and advantageous features hitherto not available.
  • the present invention provides: a mandrel having a single circumferential pressure or hydraulic chamber, which extends substantially over the length of the mandrel; does not require seal gaskets between journal sections and the outer expansion jacket or sleeve; groove or contour means for effecting desired expansion/pressure regions or rings about said outer expansion sleeve to thereby provide a substantially uniform outer jacket expansion over a predetermined portion or virtually the full longitudinal length of the jacket with application of hydraulic pressure, which feature not only provides improved frictional gripping of the image carrier sleeve but enables the use of image carrier sleeves having different longitudinal length.
  • a further distinguishing feature of the present inventive system is the use of different outer diameter sized image carrier sleeves, with each having substantially the same inner diameter to enable being selectively slid onto the outer expansion jacket of the present inventive mandrel structure.
  • a printer will require relatively few mandrel type cylinders; the use of a plurality of image carrier sleeves each having substantially the same inner diameter; the ability of using various image carrier sleeves having different outer diameters on the same mandrel without installing adjustment collets, etc.; that the shipping costs, of the relatively light weight image carrier sleeves, from the engraver to the printer are substantially reduced or constrained; that the handling and storage difficulties and expenses are curtailed; that any down-time typical with the prior art to replace image carrier sleeves is substantially reduced; that the operational down-time required in the prior art to retrofit the presses with different sized mandrels is substantially, if not fully, eliminated by the use of image carrier sleeves having selectively different thickness in accordance with the present invention.
  • a printing system similar to a so-called gravure, flexographic or lithographic process employs an expandable mandrel assembly having spaced end journal members, a first tubular cylinder circumferentially mounted or secured at each end on a respective end journal member, a second tubular cylinder mounted on and having an inner diameter greater than the outer diameter of said first tubular cylinder and being substantially coaxial and ot equal length therewith, a pressurized/hydraulic circumferential chamber between said first sleeve and said outer jacket, said outer jacket.
  • the invention is characterized in that the second tubular cylinder has structural features or contours or grooves to facilitate or effect a virtually uniform expansion of the second tubular cylinder over a portion thereof with hydraulic pressure being applied within said chamber.
  • the expandable mandrel assembly is adapted to receive and frictionally grip any one of a plurality of image carrier sleeves each having an inner diameter dimensioned for selectively being slidingly mounted on said outer mandrel jacket, with each such image carrier sleeve having a different thickness to accommodate for or enable printing applications requiring different outer diameters of the image carrier sleeve(s).
  • An object of the present invention is to provide a new and improved printing system which facilitates the installation and removal of an image carrier sleeve with an expandable mandrel assembly.
  • Another object of the present invention is to provide an improved printing system whereby a plurality of image carrier sleeves having selectively different outer diameters may be utilized at different times without replacing the supporting mandrel assembly.
  • Another object of the present invention is to provide a new and improved mandrel assembly having an outer expandable circumferential jacket with a longitudinal length substantially or approximately equal to the length of the main cylinder portion of the mandrel.
  • Fig. 1 is a longitudinal sectional view through a printing roller according to one embodiment of this invention
  • Figs. 2a and 2b are illustrative plan views of several image carrying sleeves having dimensional variations in accordance with a feature of this invention.
  • Figs. 3a and 3b are end views of several prior art mandrel and image printing sleeve arrangements.
  • the expandable mandrel 10 generally comprises a pair of spaced end journal members 11, 12, an inner or central sleeve (or first tubular cylinder) 13 circumferentially mounted at its end regions 14, 15 to a respective end journal 11, 12, an outer expandable sleeve (or second tubular cylinder) 16, a pressure chamber 17, a pressure or hydraulic delivery system 18, and two or more expansion grooves or selective expansion means 19.
  • Each end journal member 11, 12 is formed of suitable material such as steel and has a circular outer configuration 20 of predetermined diameter, and a lower circumferential ledge 21.
  • One or both journal members 11, 12 contain hydraulic fluid passageways 22, 23 for containing hydraulic fluid 24.
  • only one end journal member 11 need contain drill holes or throughbores 22, 23 comprising a portion of the hydraulic system 18.
  • an advantage of the present invention is the ability to provide a relatively less complex and less expensive hydraulic throughbores 22, 23 in only one end journal member 11.
  • the mouth end of throughbore 22 contains female threads 25 for matingly receiving the male threads of a hydraulic actuator 26.
  • the hydraulic actuator 26 contains exterior sections such as a hexagonal nut like portion 27 which when manually rotated clockwise and counter-clockwise causes the hydraulic plunger 28 to be selectively displaced inwardly and outwardly.
  • Each end journal member 11, 12 has an outwardly projecting trunnion 29, 30, respectively, which are used to rotatably mount the mandrel 10 onto the printing press (not shown). Since such trunnion 29, 30 mounting members are conventional, detail discussion thereof will be omitted to avoid prolixity.
  • FIG. 1 Another alternative embodiment shown in phantom dotted outline of the hydraulic fluid passageways includes a release valve 32 and connecting throughbore 33, shown in phantom outline.
  • a separate release valve 32 may be superfluous or redundant, since the main adjustment valve 27 may be rotated, for example counter-clockwise, to outwardly displace the plunger and, thereby, reduce or release the hydraulic pressure within the hydraulic system.
  • a separate release valve 32 may be desired.
  • Another alternative embodiment shown in phantom outline 35 is a second hydraulic fluid passageway 36 and adjustment valve 37 provided in the other end journal member 12. In this manner, the press operator can select the most accessible end of the mandrel 10 to effect hydraulic fluid pressure.
  • hydraulic actuator is the use of high pressure grease fittings (not shown) in addition to or in place of the closed plunger system described above in detail.
  • a feature of the invention enables hydraulic pressure adjustment from only one end or, alternatively, either or both end journal members 11, 12.
  • Each end of inner sleeve 13 contains a double ledge arrangement 41, 42 extending circumferentially and dimensioned for matingly engaging the circumferential ledges or platforms 20, 21 provided on each end journal 11, 12, respectively.
  • the inner sleeve 13 is snugly or force fitted onto each end journal member 11, 12, and may be secured, for example, by weld spots 43, thereto to prevent relative rotation between the constituent mandrel members 11, 12, 13.
  • a body portion of mandrel 10 is configured having a central hollow core 44 and a circular elongate exterior.
  • the outer circumferential surface of inner sleeve 13 is provided with an undercut or alcove 45 to a predetermined depth, for example to a depth of 0.25 mm, and extending laterally or longitudinally across a selected predetermined portion 46 of the main body portion 40.
  • the undercut 45 extends substantially the entire length 40 of the main body portion of mandrel 10, while leaving a raised circumferential outer ring 47, 48 on each end of said inner sleeve 13.
  • alternative embodiments of the invention may utilize varied dimensional undercuts, for example, having a length substantially less than the length of mandrel 10.
  • a throughbore is drilled through inner sleeve 13 in alignment with the throughbore 23 located in end journal member 11. It should be noted that an enlarged throughbore 50 may be drilled into inner sleeve 13 and downwardly a desired depth into end journal member 11 to provide an enlarged interconnected/aligned passageway with passageway 23. A seal type sleeve or gasket like member 52 may be inserted into throughbore 50 to avoid or prevent hydraulic fluid leakage between the juxtapositioned surfaces 20, 41 of the journal member 11 and inner sleeve 13.
  • the outer expandable jacket or second tubular member 16 generally made of suitable metal, has a wall 72 of selected thickness, and a longitudinal length 40 generally equal to or slightly less than that of inner sleeve 13.
  • Jacket 16 is tubular shaped and has a pair of axially spaced circumferential inner grooves or expansion channels 19 cut into the wall 72.
  • the inner diameter of jacket 16 is slightly greater than the outer diameter of inner sleeve 13, to enable jacket 16 to be slid onto inner sleeve 13.
  • a circumferential welding 57 is provided on each end of jacket 16, to coaxially attach jacket 16 onto and about inner sleeve 13 and to provide circumferential seals therebetween. In this manner, a circumferential and laterally extending hydraulic expansion or pressure chamber 17 is provided.
  • the inner grooves 19 are dimensioned and located, for example, empirically, in order to effect a generally uniform outward circumferential expansion of jacket 16 with application of hydraulic pressure within chamber 17.
  • An inner groove 19 being approximately a distance 51 of 6 mm from each end of jacket 16, and being 3 mm wide and 0.6 mm deep has been successfully used to effect a substantially uniform expansion in the full region between the inner grooves, with an expansion jacket 16 having a general thickness 55 of 2.3 mm to 3.3 mm.
  • the dimensions of grooves 19 and wall thickness of jacket 16 are subject to variation, it being understood that greater diameters of the jackets will require greater wall thickness and consequently larger grooves. Also more than two grooves may be employed, one possibility being an additional groove in the center of jacket 16 having a selected smaller size than end grooves 19.
  • the hydraulic pressure system 18 generally comprises expansion chamber 17, hydraulic passageways 22, 23 and the adjustment plunger 28, to control the hydraulic fluid pressure therewithin.
  • the image carrier sleeve 61 is designed and dimensioned for being slid onto the expansion mandrel 10.
  • Figs. 3A and 3B utilized mandrels 80, 81 having different diameters 82, 83, in order to accommodate image printing cylinders 84, 85 having different inner and outer diameters 82, 83, 86, 87.
  • image printing cylinders 84, 85 had substantially the same thickness 88, and did not vary the cylinder thickness 88 for the purpose of varying the outer diameters 86, 87.
  • the prior art utilized different sized mandrels 80, 81, which inherently resulted in a relatively costly system of several expensive and difficult to handle/store mandrels 80, 81 sizes 82, 83.
  • a feature of the present invention is the ability to use several image carrier sleeves 61, 62 that can be mounted/slid onto a single expandable mandrel 10 having a diameter 68, without necessity of installing different mandrels or relatively expensive mandrel adapters mounted on each journal member as shown in U.S. Patent No. 4,651,643.
  • the system contemplated in accordance with the present invention comprises an expandable mandrel 10 having means or expansion jacket 16 which provides improved frictional gripping over a relatively large axial surface area 46 and the ability of selectively using image carrier sleeves 61, 62 having substantially the same inner diameters 67 but with different outer diameters
  • print jobs requiring different print area, i.e., length of circumference, on image carrier sleeves 61, 62 may be selectively provided without costly replacement or adapting of the mandrel 10.

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  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un mandrin de cylindre d'impression extensible (10), comprenant un ensemble mandrin à quatre pièces présentant des parties extérieures espacées formant tourillon, un premier manchon cylindrique (13) monté de façon circonférentielle au niveau de ses extrémités autour d'une partie correspondante formant tourillon (11, 12), un second manchon cylindrique (16) présentant un diamètre intérieur légèrement supérieur au diamètre extérieur dudit premier manchon cylindrique et monté de façon circonférentielle sur celui-ci au moyen, par exemple, de soudures circonférentielles (57) afin de créer un espace pratiquement homogène (17) situé de façon circonférentielle entre le premier (13) et le second manchon (16). Le second manchon (16) est pourvu d'au moins une zone d'élasticité ou de préférence d'extension, par exemple des gorges circonférentielles (19), ainsi que d'un système hydraulique pour appliquer une pression entre le premier et le second manchon, en vue de provoquer une extension vers l'extérieur du second manchon. L'invention concerne également des manchons (61, 61) servant de forme d'impression, interchangeables, présentant chacun une épaisseur sélectionnée pour pouvoir s'accoupler avec différents cylindres encreurs.
PCT/US1996/000358 1994-10-03 1996-01-08 Mandrin de cylindre d'impression pour manchons servant de forme d'impression WO1997025208A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/317,635 US5481975A (en) 1994-10-03 1994-10-03 Printing cylinder mandrel and image carrier sleeve
PCT/US1996/000358 WO1997025208A1 (fr) 1994-10-03 1996-01-08 Mandrin de cylindre d'impression pour manchons servant de forme d'impression
AU48968/96A AU4896896A (en) 1994-10-03 1996-01-08 Printing cylinder mandrel for image carrier sleeves

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/317,635 US5481975A (en) 1994-10-03 1994-10-03 Printing cylinder mandrel and image carrier sleeve
PCT/US1996/000358 WO1997025208A1 (fr) 1994-10-03 1996-01-08 Mandrin de cylindre d'impression pour manchons servant de forme d'impression

Publications (1)

Publication Number Publication Date
WO1997025208A1 true WO1997025208A1 (fr) 1997-07-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/000358 WO1997025208A1 (fr) 1994-10-03 1996-01-08 Mandrin de cylindre d'impression pour manchons servant de forme d'impression

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110216976A (zh) * 2019-07-16 2019-09-10 深圳市兴博防伪技术开发有限公司 一种胶辊

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782234A (en) * 1971-05-27 1974-01-01 Ungerer Irma Gripping shaft
US4656942A (en) * 1977-12-27 1987-04-14 Stork Brabant B.V. Printing apparatus utilizing flexible metal sleeves as ink transfer means
US5481975A (en) * 1994-10-03 1996-01-09 Schulz; Werner Printing cylinder mandrel and image carrier sleeve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782234A (en) * 1971-05-27 1974-01-01 Ungerer Irma Gripping shaft
US4656942A (en) * 1977-12-27 1987-04-14 Stork Brabant B.V. Printing apparatus utilizing flexible metal sleeves as ink transfer means
US5481975A (en) * 1994-10-03 1996-01-09 Schulz; Werner Printing cylinder mandrel and image carrier sleeve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110216976A (zh) * 2019-07-16 2019-09-10 深圳市兴博防伪技术开发有限公司 一种胶辊

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