• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Adapter shirt for flexographic printing machines; suitable for mounting on it a printing shirt; said adapter jacket (1a, 1b): an outer cylinder (2) of a rigid material; an inner cylinder (3) defining a cylindrical mounting hole of the adapter sleeve (1a, 1b) on a rotating core (N) of a printing machine; annular spacers (4) mounted between the outer cylinder (2) and the inner cylinder (3) and longitudinally spaced apart. The adapter sleeve (lb) comprises a self-contained hydraulic device (5) for attachment to a rotary core (N) and comprises: hydraulic pads (51, 56) disposed between the inner surface of the inner cylinder (3) and the annular spacers (4) and connected by means of a hydraulic circuit (52) to a pressurisation element (53), manually operable. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2712654A1
    申请号:ES201731317
    申请日:2017-11-13
    公开日:2019-05-14
    发明作者:Matamala Francisco Javier Boadas
    申请人:Rossini Spain Printing Rollers Sau；
    IPC主号:
    专利说明:

    [0001]
    [0002] Adapter shirt for flexographic printing machines.
    [0003]
    [0004] Object of the invention.
    [0005]
    [0006] The present invention relates to an adapter sleeve intended to be mounted on the rotating core of a flexographic printing machine and which in turn allows the assembly of printing shirts on said adapter sleeve.
    [0007]
    [0008] Field of application of the invention.
    [0009]
    [0010] The invention relates to adapter sleeves, also known as bridge sleeves or "carriers", applicable in flexographic printing machines.
    [0011]
    [0012] State of the art
    [0013]
    [0014] Basically, as is known in the state of the art, these adapter sleeves have the purpose of supplementing the diameter of the rotating core of the flexographic printing machines, in order to allow the use in said machine of printing shirts of different development. .
    [0015]
    [0016] Assuming that the outer diameter of the rotating core of a printing machine in the flexographic printing field is concentric with its axis of rotation, then as the rotational speed of the printing sleeve mounted on said rotating core increases, the The maintenance of a suitable printing quality depends more and more on maintaining a fixed and unchanging radial distance between the outer diameter of the rotating core and the inner diameter of the printing sleeve. If this radial distance varies, then the print quality degrades. One type of degraded print quality takes the form of slightly inked, or non-inked portions of the image that alternate with dark inked portions of the image.
    [0017] A variation in this desired fixed and invariable radial distance can occur if the impression sleeve is subjected to vibration as said impression sleeve and the core rotate. This variation in the fixed and invariable radial distance can arise when an asymmetric impression surface of the impression sleeve causes an irregular pressure to be applied and this irregular pressure in turn produces a vibrational resonance effect to the adapter sleeve that results in that said adapter sleeve deviates from the round shape when the impression sleeve and the core rotate. Said variation in the fixed and invariable radial distance can also occur, for example, due to the rotational inertia acting on the adapter sleeve at very high printing speeds.
    [0018]
    [0019] In the field of flexographic printing, in order to increase the circumference of the printing surface without increasing the diameter of the rotating core, an adapter sleeve is applied which is disposed between the outer cylindrical side of a rotating core of a printing machine and the inner surface of a printing shirt, which carries on its external cylindrical surface the cliches or images to be printed.
    [0020]
    [0021] The use of an adapter sleeve, as described in U.S. Patent 5,782,181, allows various printing developments to be achieved with the same rotating core.
    [0022]
    [0023] However, an adapter sleeve that does not serve as a rigid concentric union between the outer diameter of the rotating core and the inner diameter of the impression sleeve will not maintain a fixed and unchanging radial distance between the outer diameter of the rotating core and the inner diameter of the rotating core. the printing shirt and therefore will result in the unsatisfactory print quality types described above.
    [0024]
    [0025] Several methods are known for mounting a conventional adapter sleeve (defined by a hollow cylinder with a through hole) on a rotating core l of a printing machine:
    [0026] - Rotating core with pneumatic system.
    [0027]
    [0028] Although mounting systems using hydraulic systems and mounting systems employing mechanical connections are known, these are typically more cumbersome and heavier than the known "air assembly" pneumatic system employing adapter sleeves, such as those described in the Patents of US 5,819,657, US 6,688,226; and US 6,691,614 having an inner core layer slightly expandable in the radial direction and an inner surface diameter slightly smaller than the diameter of the outer surface of the rotating core.
    [0029]
    [0030] By placing the adapter sleeve at one end of the rotating core, compressed air is supplied through holes defined in the rotating core into the space between the outer surface of the rotating core and the inner surface of the adapter sleeve. The compressed air sufficiently expands the diameter of the inner surface of the conventional adapter sleeve to allow said adapter sleeve to slide over an air chamber, along the outer surface of the rotating core.
    [0031]
    [0032] When the supply of compressed air is interrupted, the diameter of the inner surface of the conventional adapter sleeve contracts sufficiently to allow the inner surface to grip the outer surface of the rotating core in an interference fit between the rotating core and the conventional adapter sleeve .
    [0033]
    [0034] Adapter sleeves mounted with air, such as those described in US Patents 5,819,657, US 6,688,226; and US 6,691,614 comprise: a multilayer body formed by: a rigid outer cylinder of carbon fiber; a cylindrical inner layer with an inner cylindrical surface of diameter slightly smaller than the diameter of the outer surface of the rotating core and at least one elastically compressible and radially deformable layer disposed against the outer cylindrical surface of the cylindrical inner layer of the adapter sleeve.
    [0035]
    [0036] When the core of the printing machine rotates, the continued shock of the print cliche with the printing surface at each turn, produces vibrations that increase with the increase in speed in meters per minute. Said vibrations cause radial displacements of the outer surface of the adapter sleeve with respect to the core and an irregular impression with alternating regions in which the image is printed darker and lighter than it should be printed.
    [0037]
    [0038] - Rotating core with hydraulic fixation.
    [0039]
    [0040] This hydraulic system requires a specially configured rotating core and an adapter sleeve provided with two heads, reinforced with steel inserts, on which a carbon fiber cylinder is mounted.
    [0041]
    [0042] At each end of the rotating core is an expandable ring, whose diameter expands and contracts according to the introduction or removal of incompressible fat that is used hydraulically to expand or contract the rings. Each of these rings expands to come into contact with the inner surface of the steel insert located at the corresponding end of a carbon fiber tube forming the adapter jacket.
    [0043]
    [0044] These hydraulic rotating cores have several drawbacks: a high cost; that as the rings expand and contract with use, the rings become fatigued and their expansion eventually occurs non-uniformly, so that they are not round relative to the central axis of the rotating core, providing irregular impressions; and the need to use adapter sleeves provided with heads reinforced with steel inserts to withstand the pressure of the rings of the rotating core when said rings expand hydraulically.
    [0045]
    [0046] - Adaptation shirt with mechanical fixation.
    [0047]
    [0048] In United States Patent US 6,647,879 a mechanical system for mounting an adapter sleeve on a rotating core is described. The adapter sleeve has opposed hubs on which a carbon fiber cylinder is mounted. The internal diameter of each of these cubes is expanded and contracted mechanically by a semicircular collar having a first end pivotally connected to a first hub and a second opposite end connected to a second hub through an eccentric cam that opens and closes a clamp pivoting, so that the inner diameter of the collar can be expanded and contracted by the movement of the eccentric cam.
    [0049]
    [0050] A drawback of this system is the contact of steel with steel between the inner diameter of the collar and the outer diameter of the rotating core, since each time this adapter sleeve slides on the rotating core, inevitably there is some damage on the outer surface of the rotating core. rotating core by contact with the inside diameter of the collar. Another drawback of this mechanical fixation is the inability to absorb or minimize the transmission of vibrations of the rotating core to the impression sleeve, when working at a printing speed of more than 250 meters per minute.
    [0051]
    [0052] - Adapter shirt with pneumatic fixation.
    [0053]
    [0054] EP 2844476 B1 discloses an adapter sleeve having at each of its ends a rigid stabilizer that expands diametrically using compressed air for mounting the adapter sleeve on the rotating core of the printing machine.
    [0055]
    [0056] Said adapter jacket comprises an incompressible outer layer defining a hollow element of cylindrical shape, with a first end, a second end and an external surface suitable for mounting a printing sleeve.
    [0057]
    [0058] Said adapter sleeve has at its ends a first and a second stabilizer. Each stabilizer comprises: a rigid outer casing having an internal cavity with an internal conical surface; and an internal envelope capable of axial displacement within the respective internal cavity and defining an internal cylindrical surface contact with the rotating core of the printing machine; the diameter of the respective internal cylindrical contact surface being suitable for changing as the respective internal casing moves axially with respect to the respective rigid outer casing.
    [0059]
    [0060] To allow the variation of diameter of the inner casing of the stabilizers, during its pneumatic operation and the fixation of the adapter sleeve to a rotating core, the inner shell of each of the stabilizers is composed of a plurality of sections joined together by their adjacent axial edges by an elastic adhesive such as a polymeric adhesive.
    [0061]
    [0062] This adapter has a large number of moving parts inside the adapter jacket which increases the manufacturing costs and the probability of failure; especially that taking into account that its operation requires the introduction to the stabilizers of air pressure that may be contaminated with impurities.
    [0063]
    [0064] This adapter sleeve, like other mentioned above, requires for its operation the external supply of fluid under pressure (pneumatic or hydraulic) which prevents its autonomous operation.
    [0065]
    [0066] Description of the invention
    [0067]
    [0068] The adapter sleeve for printing machines object of this invention is suitable to allow the mounting on it of a printing sleeve, said adapter sleeve having an outer cylinder of rigid material, an inner cylinder that defines a cylindrical hole for mounting the sleeve adapter on a rotating core of a printing machine, and rigid annular spacers mounted between the outer cylinder and the inner cylinder, and spaced in longitudinal direction, ie in the direction of the axis of rotation of the adapter sleeve.
    [0069]
    [0070] This adapter sleeve has constructive features designed to allow its fixation autonomously, by means of a hydraulic pressure device mounted thereon, on the rotating core of the printing machine, which allows the adapter sleeve to be mounted on existing rotating cores of any type (hydraulic or pneumatic), as long as they have an outer diameter slightly lower than the cylindrical hole of the adapter sleeve, since in this invention the means for fixing the adapter sleeve are located in the adapter sleeve itself and not in the rotating core of the flexographic printing machine.
    [0071] Another objective of the invention is that the hydraulic device for fixing the adapter sleeve on the rotating core makes a damping of the vibrations of the inner cylinder of the adapter jacket, preventing or significantly reducing the possibility of transmitting said vibrations to the outer cylinder of the adapter sleeve.
    [0072]
    [0073] To achieve the proposed objectives and in accordance with the invention, this adapter sleeve comprises: an inner cylinder formed in a material deformable elastically under pressure and of an internal diameter slightly larger than that of the rotating core; and a hydraulic, self-contained device for fastening the adapter sleeve to a rotating core of a printing machine.
    [0074]
    [0075] Said hydraulic device is integrated in the adapter sleeve itself and comprises hydraulic pads (pads) arranged between the internal surface, or larger diameter, of the inner cylinder and the annular spacers, said hydraulic pads being connected by means of a hydraulic circuit to a pressurisation element manually actuable and that allows to realize the pressurization and depressurization of the circuit and, consequently, the inflation or deflation of the hydraulic pads.
    [0076]
    [0077] The pressurization of the circuit causes the inflation of the hydraulic pads, and the pressing of the inner cylinder in radial direction, by the hydraulic pads, against the rotating core of the printing machine, with the consequent fixation of the adapter sleeve to the rotating core.
    [0078]
    [0079] By depressurizing the circuit, the deflation of the hydraulic pads and the elastic recovery of the inner cylinder to its original shape are achieved, with the consequent release of the adapter sleeve of the rotating core of the printing machine.
    [0080]
    [0081] In this invention it is provided that said hydraulic device may comprise a hydraulic pad of annular configuration mounted between the inner surface, or of smaller diameter, of the inner cylinder and the spacers annular or several hydraulic pads of smaller surface, distributed circumferentially between the inner cylinder and the annular spacers.
    [0082]
    [0083] In any case the swelling of these hydraulic pads causes a radial deformation of the inner cylinder and a reduction in the diameter of the inner hole itself, in areas facing the annular spacers, causing the pressing of the inner cylinder against the rotating core and consequently the fixing thereof. in a position of use.
    [0084]
    [0085] In this use position, the pressurized hydraulic fluid contained in the pads acts as a shock absorber of the possible vibrations of the inner cylinder during the rotation of the adapter sleeve at high printing speed; also balancing the pressure exerted by the inner cylinder on the periphery of the rotating core in the location zones of the hydraulic pads and the consequent centering of the adapter sleeve with respect to the rotating core of the printing machine.
    [0086]
    [0087] The characteristics of the invention will be more easily understood in view of the realization examples shown in the figures described below.
    [0088]
    [0089] Description of the figures.
    [0090]
    [0091] To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, a set of drawings in which, with an illustrative and non-limiting character, the following has been represented is attached to the present specification:
    [0092]
    [0093] - Figure 1 shows a schematic perspective view of an embodiment of the adapter sleeve for flexographic printing machines, provided in this case with several hydraulic pads (pads) arranged between the inner surface, of greater diameter, of the inner cylinder and the annular separators of the adapter sleeve.
    [0094]
    [0095] - Figure 2 shows a partial, exploded view of one end of the shirt adapter of figure 1, in which the circumferential disposition of the hydraulic pads is observed.
    [0096]
    [0097] - Figure 3 shows a front view of one of the ends of the adapter sleeve of the previous figures.
    [0098]
    [0099] - Figure 4 shows an elevation view of the adapter sleeve of the previous figures sectioned by a longitudinal median plane.
    [0100]
    [0101] - Figure 5 shows an enlarged detail of the section of figure 4 in which one of the depressurized hydraulic pads is observed. In this figure the portion of the adapter sleeve mounted on a portion of a rotating core of a flexographic printing machine has been represented, enlarging the separation between the facing surfaces thereof to facilitate its observation.
    [0102]
    [0103] - Figure 6 shows an analogous view to the previous one, with the pressurized hydraulic pads, in an operative position, causing an elastic deformation of the inner cylinder in radial direction and its action against the rotating core of a flexographic printing machine.
    [0104]
    [0105] - Figure 7 shows a variant embodiment of the adapter jacket in which the hydraulic device comprises a hydraulic pad, of annular configuration, disposed between the inner surface of the inner cylinder and each of the annular spacers of said adapter jacket.
    [0106]
    [0107] Preferred embodiment of the invention.
    [0108]
    [0109] In Figure 1, the adapter sleeve (1a) for flexographic printing machines comprises: a rigid outer roller (2); an inner roller (3) open at the ends, which defines a cylindrical mounting hole of the sleeve on a rotating core (N) of a flexographic printing machine and rigid annular separators (4), mounted between the outer cylinders (2) and inside (3).
    [0110]
    [0111] In this example the outer roller (2) and the annular spacers (4), are fiber carbon, although the use of other rigid materials is not ruled out, while the inner cylinder (3) is formed in an elastically deformable material when subjected to a certain pressure, for example fiberglass or other material of similar characteristics.
    [0112]
    [0113] The adapter sleeve (1a) comprises a hydraulic device (5) for fastening it around a rotating core (N) of a flexographic printing machine, represented schematically in figures 5 and 6.
    [0114]
    [0115] The hole defined by the inner cylinder (3) has a diameter slightly greater than that of the rotating core (N), as seen in figure 5, which allows the sliding assembly of the adapter sleeve (1a) on the rotating core ( N) of a printing machine.
    [0116]
    [0117] The hydraulic device (5) responsible for fixing the adapter sleeve (1a) to the rotating core (N) comprises hydraulic pads (51) arranged circumferentially between the inner surface of the inner cylinder (3) and each one of the annular spacers (4) arranged at the end of the adapter sleeve (1a).
    [0118]
    [0119] The hydraulic pads (51) are connected by means of a hydraulic circuit (52) to a pressurization element (53) which when manually operated causes pressurization or pressurization of said hydraulic circuit (52) and deflation or swelling of the hydraulic circuits (52). hydraulic pads (51) as shown in figures 5 and 6 respectively.
    [0120]
    [0121] The pressurization element (53) is constituted in this embodiment by a hydraulic cylinder connected to the hydraulic circuit (52) and provided with a piston displaced by a threaded rod (54) manually operable from the outside of the sleeve and with a suitable tool through of a hole (41) defined for this purpose in one of the annular spacers (4).
    [0122]
    [0123] The hydraulic device (5) also comprises a pressure limiter (55) shown, referenced in Figure 1, which prevents the pressurization of the circuit hydraulic (52) above a predetermined value in case the pressurization element (53) is operated in an uncontrolled manner.
    [0124]
    [0125] This pressurization element (53) can be of any other type that allows to pressurize and depressurize the hydraulic circuit (52) and the hydraulic pads connected thereto; allowing in any case an autonomous operation of the hydraulic device (5).
    [0126]
    [0127] In figure 5 the hydraulic circuit (52) is depressurized and the hydraulic pads (51) deflated; defining the inner cylinder (3) a hole of a constant diameter and slightly larger than that of the rotating core (N) of the printing machine, allowing the sliding assembly and disassembly of the adapter sleeve (1a) on said rotating core (N).
    [0128]
    [0129] As shown in Figure 6, when the hydraulic circuit (52) is pressurized, the hydraulic pads swell causing a radial deformation of the inner cylinder (3) that exerts a pressure on perimeter zones of the rotating core (N), establishing the fixing the adapter sleeve (1a) with respect to the rotating core (N).
    [0130]
    [0131] This deformation of the inner cylinder (3) towards its interior by the action of the hydraulic pads is possible thanks to the elasticity of the material forming said inner cylinder (3) and to the rigidity of both the annular spacers (4) and the outer cylinder (3). two),
    [0132]
    [0133] In figure 7 an adapter sleeve (1b) is shown, which constitutes a variant embodiment of the adapter sleeve (1a) of the previous figures, and in which the hydraulic device (5) comprises, instead of the hydraulic pads circumferentially distributed, hydraulic pads (56) of annular configuration mounted between the inner cylinder (2) and each of the annular spacers (4) and which provide an analogous operation to that described above.
    [0134]
    [0135] Once the nature of the invention has been sufficiently described, as well as an example of a preferred embodiment, it is stated for the appropriate purposes that the materials, The shape, size and disposition of the described elements could be modified, provided that this does not imply an alteration of the essential characteristics of the invention that are claimed below.
    权利要求:
    Claims (6)
    [1]
    1. Adapter shirt for flexographic printing machines; suitable for the mounting on it of a printing shirt; said adapter sleeve (1a, 1b): an outer cylinder (2) of a rigid material; an inner cylinder (3) open at the ends and defining a cylindrical mounting hole of the adapter sleeve on a rotating core (N) of a printing machine; annular spacers (4) mounted between the outer cylinder (2) and the inner cylinder (3) and longitudinally spaced apart; characterized in that it comprises a hydraulic device (5), autonomous, for fastening the adapter sleeve (1a, 1b) with respect to a rotating core (N); said hydraulic device (5) is integrated in the adapter sleeve (1a, 1b) and comprises: hydraulic pads (51, 56) disposed between the inner surface of the inner cylinder (3) and the annular spacers (4) and connected by means of a hydraulic circuit (52) to a piston displaced by a threaded rod (53) manually operable, which causes: by pressurizing the hydraulic circuit (52) the inflation of the hydraulic pads (51, 56) and the pressing of the cylinder inside (3) against the rotating core (N) of a printing machine with the consequent fixation of the adapter sleeve (1a, 1b) to the rotating core (N); and by depressurizing the hydraulic circuit (52) the deflation of the hydraulic pads (51, 56) and the elastic recovery of the inner cylinder (3) with its consequent release of the rotating core (N).
    [2]
    2. - Adapter shirt, according to claim 1, characterized in that it comprises several hydraulic pads (51) distributed circumferentially between the inner cylinder (3) and each of the annular spacers (4).
    [3]
    3. - Adapter shirt, according to claim 1, characterized in that it comprises a hydraulic pad (56) of annular configuration mounted between the inner cylinder (3) and each of the annular spacers (4).
    [4]
    4. Adapter shirt, according to claim 1, characterized in that the hydraulic device (5) comprises a pressure limiter (55) that prevents the pressurization element (53) from transmitting a pressure to the hydraulic circuit (52). higher than a predetermined value.
    [5]
    5. Adapter shirt according to claim 1, characterized in that the pressurization element (53) comprises a hydraulic cylinder connected to the hydraulic circuit (52) and provided with a threaded piston (54) manually operable from the outside of the adapter jacket.
    [6]
    6. - Adapter shirt, according to claim 1, characterized in that the inner cylinder (3) is formed in an elastically deformable material in radial direction by the action of the hydraulic pads (51, 56).
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    同族专利:
    公开号 | 公开日
    ES2811513T3|2021-03-12|
    US20190143731A1|2019-05-16|
    US10843457B2|2020-11-24|
    CA3023872A1|2019-05-13|
    ES2712654B2|2019-10-16|
    EP3482938A1|2019-05-15|
    EP3482938B1|2020-05-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4651643A|1985-02-14|1987-03-24|Sidney Katz|Adaptors for use with printing cylinder mandrels|
    US5840386A|1996-02-22|1998-11-24|Praxair S.T. Technology, Inc.|Sleeve for a liquid transfer roll and method for producing it|
    DE10023742A1|2000-05-15|2001-11-22|Windmoeller & Hoelscher|Plate cylinder with changeable printing sleeves for a printing machine comprises a base mandrel which is provided with means allowing either nonmetal or metal printing sleeves to be installed on it|
    US20040079250A1|2000-07-25|2004-04-29|Heinz Lorig|Adapter sleeve, especially for printing presses|
    US4111569A|1977-06-14|1978-09-05|Magnat Corp.|Shell and shaft subassembly|
    US4135677A|1977-07-14|1979-01-23|Cedco, Inc.|Pneumatic shafts, chucks and lifts for roll stock|
    FR2720030B1|1994-05-19|1996-08-09|Jean Francille|Device for mounting printing sleeves on cylinders supporting flexographic machines.|
    US5819657A|1996-03-11|1998-10-13|Ermino Rossini, Spa|Air carrier spacer sleeve for a printing cylinder|
    EP1164011A3|2000-06-16|2005-09-14|ROSSINI S.p.A.|Multi-layered printing sleeve|
    IT1318961B1|2000-10-03|2003-09-19|Erminio Rossini S P A Ora Ross|PERFECT SLEEVE FOR SUBSIDIARY CYLINDER OF AN INDIRECT OR "OFFSET" PRINTING MACHINE.|
    US6647879B1|2002-12-26|2003-11-18|Paper Converting Machine Co.|Bridge sleeve for printing apparatus|
    ITFI20030134A1|2003-05-15|2004-11-16|Perini Fabio Spa|VARIABLE CROWNING ROLLER FOR PROCESSING DEVICES OF CONTINUOUS TAPE MATERIAL AND DEVICE INCLUDING THE ROLLER|
    US9126395B2|2012-04-30|2015-09-08|Rossini S.P.A.|Bridge sleeves with diametrically expandable stabilizers|
    US9120302B2|2012-04-30|2015-09-01|Rossini S.P.A.|Bridge sleeves with diametrically expandable stabilizers|
    法律状态:
    2019-05-14| BA2A| Patent application published|Ref document number: 2712654 Country of ref document: ES Kind code of ref document: A1 Effective date: 20190514 |
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201731317A|ES2712654B2|2017-11-13|2017-11-13|Adapter shirt for flexographic printing machines|ES201731317A| ES2712654B2|2017-11-13|2017-11-13|Adapter shirt for flexographic printing machines|
    EP18000147.1A| EP3482938B1|2017-11-13|2018-02-15|Adapting sleeve for flexographic printing machine|
    ES18000147T| ES2811513T3|2017-11-13|2018-02-15|Adapter sleeve for flexographic printing machine|
    US16/186,976| US10843457B2|2017-11-13|2018-11-12|Adapting sleeve with hydraulic pads for a flexographic printing machine|
    CA3023872A| CA3023872A1|2017-11-13|2018-11-13|Adapting sleeve with hydraulic pads for a flexographic printing machine|
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