EP3261844A1 - Rouleau de machine d'impression flexographique, et machine d'impression flexographique associée - Google Patents

Rouleau de machine d'impression flexographique, et machine d'impression flexographique associée

Info

Publication number
EP3261844A1
EP3261844A1 EP16719466.1A EP16719466A EP3261844A1 EP 3261844 A1 EP3261844 A1 EP 3261844A1 EP 16719466 A EP16719466 A EP 16719466A EP 3261844 A1 EP3261844 A1 EP 3261844A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
cylindrical support
locking pin
roller
cylinder
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.)
Granted
Application number
EP16719466.1A
Other languages
German (de)
English (en)
Other versions
EP3261844B1 (fr
Inventor
Antonino 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.)
ZENIT SpA
Original Assignee
ZENIT 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 ZENIT SpA filed Critical ZENIT SpA
Publication of EP3261844A1 publication Critical patent/EP3261844A1/fr
Application granted granted Critical
Publication of EP3261844B1 publication Critical patent/EP3261844B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/20—Means enabling or facilitating exchange of tubular printing or impression members, e.g. printing sleeves, blankets
    • B41P2227/21—Means facilitating exchange of sleeves mounted on cylinders without removing the cylinder from the press

Definitions

  • the present invention concerns the flexographic printing and, in particular, it relates to a roller, for example an inking or printing roller, of a printing machine with flexographic technology. Furthermore, the invention relates to a flexographic printing machine that comprises said roller.
  • the flexography is a rotary printing method wherein a printing roller, having matrix boards - called cliche - arranged on an external surface, prints a plastic film or paper sheet which slides, in a continuously way, in contact with this.
  • This is a printing technology used for example for flexible packaging or a daily.
  • a flexographic printing machine comprises an ink container and a feeding roller of ink, commonly in a rubber material, that draws ink in mentioned ink container. Furthermore, the flexographic printing machine comprises an inking roller arranged to contact with feeding roller; a doctor blade is associated to the inking roller, wherein the doctor blade is adapted to eliminate surplus ink. A printing roller is arranged in contact with said inking roller. A pressure roller is provided, that is adapted to keep film in contact with said printing roller.
  • the inking roller known with the term of "anilox" has, on an external surface, a plurality of microcells that is adapted to contain ink, which in the rotary contact between inking roller and printing roller, is deposited on matrix applied to printing roller.
  • Printing rollers with a sleeve structure are known.
  • the sleeve is substantially a tubular element put on a cylindrical support; the sleeve can be selectively interchanged by cylindrical support.
  • a matrix On outer surface of sleeve a matrix, in case of inking roller, is provided.
  • the sleeve comprises more layers: an outer metal layer, commonly aluminum, on which an incised surface is obtained, an intermediate layer of deformable material, and a third layer of composite material - for example fiber glass - in contact with cylindrical support.
  • an outer metal layer commonly aluminum
  • an intermediate layer of deformable material for example fiber glass - in contact with cylindrical support.
  • a third layer of composite material for example fiber glass - in contact with cylindrical support.
  • a layered structure of the sleeve provides a locking means function on the cylindrical support, as described below.
  • the sleeve uses an "air pillow" at high pressure, which is apt to insert or extract the sleeve On the cylindrical support.
  • the installation is carried out by expanding the deformable layer by an airflow that flows in a radial direction, through holes made on the surface of the cylindrical support, to generate the air pillow for coupling the sleeve on the cylindrical support. Once airflow is discontinued, the deformable layer expands again in the original position in order to block the sleeve on the cylindrical support.
  • the sleeve can be easily extracted, in reverse steps, by generating again the air pillow.
  • the deformable layer furthermore, causes a lower rotation quality (eccentricity) with further problems of printing quality.
  • the cylindrical support is also subject to drawback such as a possible blocking of holes on the outer surface that perform air pillow. In this case, maintenance and cleaning with subsequent increasing of passive time production are necessary.
  • the metal layer is engaged with the sandwich layer in composite material, with a pressing tool and glued to it with special glue with more components.
  • the sandwich layer end has to be protected by the hits by seal plastic rings to avoid ink infiltration; aspects these that show relevant complications of the structure .
  • a support cylinder 10 that comprises a sleeve 14 mounted in a exchanged way on the support cylinder 10.
  • the support cylinder 10 is closed to the two ends forming a closed chamber 16. A feeding compressed air is supplied in one of the end of the support cylinder.
  • the support cylinder 10 comprises a side surface 18 and nozzles 20 that define ducts, which allow the flow of compressed air.
  • the sleeve 14 comprises an inner surface 22 of diameter identical or slightly less than the diameter of the outer surface 18 of the support cylinder.
  • Each nozzle 20 comprises a stopper device 24 that operates or blocks the flows of the compressed air by the inner outwards of the support cylinder.
  • Such stopper device comprises a slide 26 that is movable in translating in a direction substantially perpendicular to the nozzle in a chamber 28 that divide the nozzle 20 in two parts, a first part called inlet that connects the closed chamber 16 in the chamber 28, and a second part called outlet that connects the chamber 28 with the outside of the support cylinder offset.
  • the obturators arranged in nozzles is adapted to allow or to block air flow during assembly operations.
  • the structure of the sleeve is flexible such that it can be radially expanded pushed by the air pillow generated .
  • FR2789626 describes, furthermore, the prearranging a bolt that has a prevent function to block a relative rotation between the sleeve and the support, but it has not the function to block the same sleeve, which is carried out in a classic way with the aid of the air pillow.
  • It is an object of the present invention provides a roller of a flexographic printing machine, which is adapted to overcome the inconveniences of the prior art by simplifying the structure and the costs of the structure of the same.
  • Another object of the present invention provides a flexographic printing machine that achieves the same obj ects .
  • a roller of a flexographic printing machine in particular an inking or printing roller, comprising:
  • said sleeve has a stiff configuration, in a radial direction with respect to said longitudinal axis (x) , said sleeve having a tolerance size in order to make a clearance fit with said cylindrical support, and wherein said locking means comprises:
  • the roller according to the present invention, its therefore structurally much easier and provide a tubular sleeve with a single rigid layer or thickness, without a sandwich structure, and at least one mechanical locking pin, with dedicated actuating means, which ensures an higher stability to the sleeve when its engaged on the cylindrical support; this configuration solves eccentricity inconveniences .
  • the locking pin is able to overcome a wear drawback of the deformable layer in the sleeve, according to the prior art. Furthermore, its able to improves the engagement stability and therefore a printing quality.
  • the sleeve has a stiff structure, which is not deformable in a radial direction, contrary to a sandwich structure of sleeve according to the prior art. It's simply obtained by machine tools and has an inner diameter - defined by an inner side face of the same - with a tolerance dimension adapted to be engaged with the cylindrical support, without a pillow air.
  • said tolerance size defined among an inner diameter of the sleeve and outer diameter of the support cylinder has a value ⁇ set between 0.02 and 0.09 mm, more in particular, set between 0.02 and 0.05 mm.
  • the actuating means of the locking pin are pneumatic means.
  • a feeding duct adapted to feed a pneumatic fluid in the cylinder.
  • the piston comprises a frustoconical shaped neck defined among a maximum cross section and a minimum cross section, on the frustoconical shaped neck being functionally rests in contact at least a locking pin.
  • the locking pin is normally kept by the resilient element in the first configuration, in order to intercept the frustoconical shaped neck at the maximum cross section.
  • the locking pin passes through instead in the second configuration when is fed pneumatic fluid in the cylinder by the feeding duct, such that the overpressure obtained in the cylinder moves the piston contrasting the resilient element and the locking pin, sliding on the frustoconical neck among the maximum cross section towards the minimum cross section, arranging completely in the housing.
  • a plurality of locking pin is provided, the locking pin being radially arranged with respect to said longitudinal axis and angularly spaced to each other.
  • a spring functionally coupled to each locking pin is provided. The spring has a function to keep in contact an end portion of said pin with said frustoconical shaped neck.
  • each locking pin comprises a contact portion, which has a frustoconical profile.
  • the contact portion defines a fluid tight engagement with the housing; the spring is engaged to the locking pin.
  • a plug Opposite to the contact portion a plug is provided, the plug has a central opening from which protrudes a locking pin portion. The plug works as an upper abutment for the spring and in the meantime allows, once removed, of approach the housing the pin and the ability to carry out maintenance/changing operations of components.
  • the sleeve comprises an inner side surface, which in use faces towards said cylindrical support, and at least one circular groove adapted to engage with said locking pins .
  • said groove has a bottom wall with an inclined profile, which defines a beveled portion in order to assist the locking of the sleeve on the cylindrical support .
  • a spline arranged at opposite part with respect to the locking pins is provided; the spline allows to avoid a relative rotation of the sleeve with respect to the cylindrical support.
  • the spline is fixed.
  • Said sleeve has in turn a recess - obtained on the inner side face - in which engages, in a abutment way, with the spline once the sleeve is put completely on the cylindrical support.
  • a end stop reference by introducing the sleeve on the cylindrical support is defined by the abutment with the recess at an end portion of the support.
  • said sleeve is made of a metal material or an alloy or composite material.
  • said cylindrical support comprises a first and a second portion engaged to each other.
  • the first portion comprises a chamber that define said cylinder.
  • the second portion engages at least partially in said chamber.
  • the first and the second portion comprise respective rotating shanks of the roller according to said longitudinal axis.
  • said cylinder is obtained in a cross section of said chamber.
  • the chamber has a cross section greater than to said cylinder.
  • the cylinder substantially is obtained in a chamber portion and it is therefore open on the chamber. Such configuration allows approach the cylinder through the chamber .
  • the piston is adapted to slide among a head wall of the cylinder and a abutment ring arranged in a opposite side, from a side of said chamber.
  • the piston comprises at least one tightness seal housed peripherally on the outer surface of the piston.
  • a flexographic printing machine that comprises at least one roller, in particular an inking roller, said roller comprising:
  • - a cylindrical support having a longitudinal axis; - a sleeve that is adapted to be put in a exchanged way on said cylindrical support, coaxially to said longitudinal axis;
  • the sleeve has a stiff structure in a radial direction with respect to the longitudinal axis and has a tolerance size adapted to make a clearance fit with said cylindrical support
  • locking means comprises:
  • - actuating means of the locking pin that is adapted to cause pass selectively the locking pin among:
  • a sleeve of a roller of a flexographic printing machine wherein said roller comprises a cylindrical support having a longitudinal axis, and wherein said sleeve is adapted to be put in a exchanged way on said cylindrical support, coaxially to said longitudinal axis, wherein said sleeve is stiff in a radial direction with respect to said longitudinal axis and has a tolerance size adapted to provide a clearance fit with said cylindrical support.
  • FIG. 1 shows a perspective cross sectional view of a roller of a flexographic printing machine such as an inking roller, according to the present invention, in a configuration, where the cylindrical support and the sleeve are disengaged to each other;
  • FIG. 2 shows an elevational side view of the cylindrical support and of the sleeve of Fig. 1;
  • FIG. 3 shows a sectional elevation side view of the cylindrical support and of the sleeve partially coupled to each other;
  • FIG. 4 shows a perspective view of the same configuration of Fig. 3;
  • FIG. 5 shows a perspective view where the cylindrical support and the sleeve are completely coupled to each other .
  • a roller 1 of a flexographic printing machine is shown, in particular an inking roller, according to the present invention.
  • the roller 1 comprises a cylindrical support 2 with a longitudinal axis x, a sleeve 3 conformed to be coupled - in a exchanged way - with the cylindrical support 2, coaxially to the longitudinal axis x.
  • the roller 1 comprise locking means 4 adapted to lock the sleeve 3 on the cylindrical support 2.
  • the sleeve 3 has a stiff structure in a radial direction with respect to the longitudinal axis x and has an inner side face that achieves with the cylindrical support 2 a matching form, substantially a clearance fit, with a predetermined tolerance size.
  • the sleeve 3 is made of a metal material or an alloy or composite material.
  • the tolerance size between inner diameter of the sleeve 3 and outer diameter of the support cylinder has a value ⁇ set between 0.02 and 0.05 mm.
  • the locking means 4 comprise at least one locking pin 5 housed in a respective housing 6 obtained on the cylindrical support 2.
  • a plurality of locking pins 5 is provided.
  • the locking pins are radially arranged with respect to the longitudinal axis x and rotationally spaced to each other, with fixed pitch.
  • actuating means 7 is provided that allow to move selectively the locking pins 5 among a first configuration A to a second configuration B .
  • first configuration A Fig. 5
  • each locking pin 5 protrudes from the housing 6 and by the outer surface of the cylindrical support 2.
  • each pin 5 intercepts and stably blocks the sleeve 3, avoiding the extraction of the same in a longitudinal direction and the relative rotation about the cylindrical support 2.
  • second configuration B Fig. 1
  • each locking pin 5 is completely contained in the housing 6 and not protrudes with respect to the external surface of the cylindrical support 2 . This way, the sleeve 3 can be engaged/disengaged on/from the cylindrical support 2 .
  • the locking pins 5 are operated by a pneumatic mechanism 7 that comprises a cylinder 8 that extends along the longitudinal axis x and a piston 9 functionally coupled in the cylinder 8 .
  • a resilient element 10 is provided, preferably a spring, which is in contrast with one side of the piston
  • the piston 9 comprises a frustoconical shaped neck 9a with cross section variable among a minimum cross section 9a" and a maximum cross section 9a' (Fig.4) .
  • On the frustoconical neck 9a are functionally arranged in contact the locking pins 5 , which are disposed in a radially position.
  • the locking pins 5 are, therefore, normally kept in the first configuration to - i.e. the configuration protruding - by the spring 10 that is in contrast with the piston 9 such that the frustoconical neck 9a rests the locking pins 5 at the maximum cross section 9a' pushing the same towards the above (Fig.4) .
  • the locking pins pass instead in the second configuration B when air is supplied compressed cylinder 8 (Fig.2) by the ⁇ feeding duct 11 .
  • the overpressure obtained in the cylinder 8 pushes the piston 9 in an opposite direction contrasting the resilient action of the spring
  • the cylindrical support 2 comprises a first 2a and a second 2b portion adapted to be engaged to each other.
  • the first portion 2a is substantially slot and defines an inner chamber 2c in which the cylinder 8 is obtained.
  • the second portion 2b engages at least partially in the chamber 2c in order to close it in a fluid tight way.
  • the cylinder 8 is obtained in a portion of the chamber 2c; the chamber 2c has a larger cross section with respect to the cylinder 8.
  • the piston 9 slides between a head wall of the cylinder 8 and a abutment ring 18 arranged in the edge that faces the chamber.
  • the piston 9, furthermore, has a tightness seal 19.
  • each locking pin 5 is associated with a respective resilient element 13 adapted to keep the sliding contact - of each end portion - with the frustoconical neck 9a.
  • each locking pin 5 comprises a contact portion 5a with a frustoconical profile in a respective end.
  • the contact portion 5a defines a matching shape with the housing 6.
  • the spring 13 is inserted on the locking pin 5; opposite to the contact portion 5a a plug 5b is provided, the lug comprise an opening from which protrudes part of the locking pin 5.
  • the plug 5b integral to the cylinder works as abutment for the spring 13 that pushes the locking pin 5 towards the frustoconical neck 9a.
  • the sleeve 3 comprises, on the inner side face that faces the cylindrical support 2, a circular groove 15 which engage with the locking pins 5.
  • the groove 15 has a bottom wall 15' (Fig.5) with an inclined profile, which defines a beveled portion to assist the disengagement of the locking pins 5 when the sleeve 3 is extracted from the cylindrical support 2, according to the longitudinal axis x.
  • a spline 16 is advantageously provided, that works as a reference when the sleeve 3 is assembled on the cylindrical support 2.
  • the spline 16 allows to avoid the relative rotating of the sleeve 3 with respect to the cylindrical support 2.
  • the sleeve 3 has in turn a recess 17 in which the spline 16 engages.
  • the technical effect combined of the locking pins 5 and of the spline 16 allows to keep the sleeve 3 steadily on the support 2; said solution is adapted to improve a printing quality.
  • the structure of roller above described realize different advantages.
  • the sleeve is much cheaper, not providing a structure with more layers. Furthermore, is structurally much easier; does not require assembly operations i.e. of a pressure tool machine to press the aluminum coating, moreover does not require glues with more components, and protection rings to the end of the roller. The sleeve therefore does not subject to infiltration inconveniences .
  • roller coupled to the sleeve is much steadier and precise in rotation; is reduced remarkably the eccentricity error between support and sleeve, in order to eliminate the sandwich with a deformable middle layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention concerne un rouleau (1) d'une machine d'impression flexographique, tel qu'un rouleau d'encrage, qui comprend un support cylindrique (2), un manchon (3) agencé de manière interchangeable sur le support cylindrique (2), et un moyen de verrouillage (4) conçu pour verrouiller le manchon (3) sur le support cylindrique (2). Le manchon (3) a une structure rigide dans une direction radiale et présente une forme adaptée au support cylindrique (2). Le moyen de verrouillage (4) comprend au moins une broche de verrouillage (5) disposée à l'intérieur d'un logement respectif (6) formé dans le support cylindrique (2) dans une position radiale, et un moyen d'actionnement (7) de la broche de verrouillage (5) qui est conçu pour faire passer sélectivement la broche de verrouillage (5) entre une première configuration, dans laquelle la broche de verrouillage (5) fait saillie pour s'opposer au manchon (3) placé sur le support cylindrique (2) afin de le bloquer, et une seconde configuration, dans laquelle ladite broche de verrouillage (5) est complètement contenue dans ledit logement (6) et ledit manchon (3) peut être mis en prise sur ledit support cylindrique (2) et peut être libéré de ce dernier.
EP16719466.1A 2015-02-24 2016-02-24 Rouleau d'une machine d'impression flexographique et machine d'impression flexographique Active EP3261844B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPI20150009 2015-02-24
PCT/IB2016/000186 WO2016135552A1 (fr) 2015-02-24 2016-02-24 Rouleau de machine d'impression flexographique, et machine d'impression flexographique associée

Publications (2)

Publication Number Publication Date
EP3261844A1 true EP3261844A1 (fr) 2018-01-03
EP3261844B1 EP3261844B1 (fr) 2020-01-08

Family

ID=52815163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16719466.1A Active EP3261844B1 (fr) 2015-02-24 2016-02-24 Rouleau d'une machine d'impression flexographique et machine d'impression flexographique

Country Status (3)

Country Link
EP (1) EP3261844B1 (fr)
ES (1) ES2779456T3 (fr)
WO (1) WO2016135552A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108081751A (zh) * 2017-12-08 2018-05-29 广州市佳盛印刷有限公司 一种烟草包装盒印刷装置的安装结构
JP7197588B2 (ja) 2017-12-13 2022-12-27 フリント グループ ジャーマニー ゲーエムベーハー 空気圧クランプ式のアダプタ
EP3640031A1 (fr) * 2018-10-17 2020-04-22 Flint Group Germany GmbH Cylindre pourvu de broche mobile
DE102022126559A1 (de) * 2022-10-12 2024-04-18 Inometa Gmbh Anordnung für eine Druckmaschine sowie Verfahren zum Herstellen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK391077A (da) * 1976-09-13 1978-03-14 Rotoflex Engraving Ltd Trykkevalse
US5778779A (en) * 1996-01-04 1998-07-14 Heidelberger Druckmaschinen Ag Printing unit and register mechanism for mounting a printing sleeve
FR2789626B1 (fr) * 1999-02-12 2001-03-30 Jean Francille Dispositif d'obturation de trous de passage d'air dans un cylindre, notamment pour les cylindres supports et les manchons de compensation
JP6054145B2 (ja) * 2012-11-06 2016-12-27 株式会社ミヤコシ 印刷機の印刷胴

Also Published As

Publication number Publication date
ES2779456T3 (es) 2020-08-17
EP3261844B1 (fr) 2020-01-08
WO2016135552A1 (fr) 2016-09-01

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