EP3787899B1 - Dispositif de fixation d'une racle sur un corps de chambre a racles et chambre a racles ainsi equipee - Google Patents

Dispositif de fixation d'une racle sur un corps de chambre a racles et chambre a racles ainsi equipee Download PDF

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Publication number
EP3787899B1
EP3787899B1 EP19721191.5A EP19721191A EP3787899B1 EP 3787899 B1 EP3787899 B1 EP 3787899B1 EP 19721191 A EP19721191 A EP 19721191A EP 3787899 B1 EP3787899 B1 EP 3787899B1
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EP
European Patent Office
Prior art keywords
doctor blade
attachment member
fixing member
section
retaining section
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.)
Active
Application number
EP19721191.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3787899A1 (fr
Inventor
René Bazin
Philippe Fleury
Julien MATTRAND
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.)
Bobst Lyon SAS
Original Assignee
Bobst Lyon SAS
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Filing date
Publication date
Application filed by Bobst Lyon SAS filed Critical Bobst Lyon SAS
Publication of EP3787899A1 publication Critical patent/EP3787899A1/fr
Application granted granted Critical
Publication of EP3787899B1 publication Critical patent/EP3787899B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices

Definitions

  • the present invention relates to the technical field of doctor blade chambers for rotary flexographic printing units and more particularly to the device for fixing the doctor blades to the body of the doctor blade chambers.
  • Flexography is a rotary printing process that can be used on many supports, for example of the sheet or web type, cardboard or plastic material, and requiring the use of plates, or forms of printing, flexible and in relief.
  • a printing machine comprises several printing groups placed one after the other and each dedicated to a specific color.
  • Flexography is a rotary printing process that can be used on many supports and requires the use of plates, or printing forms, which are relatively flexible and in relief.
  • a printing unit comprises a plate cylinder, configured to carry the printing form, a screen cylinder or anilox cylinder, presenting on its surface a set of cells intended to collect ink in a quantity controlled by the volume of the cells, the anilox cylinder being configured to transfer the ink onto the plate, a doctor blade chamber, configured to fill the cells of the anilox cylinder, a pump, ensuring the routing of the ink from the ink reservoir to the doctor blade chamber, and a back pressure cylinder holding the media being printed against the plate cylinder.
  • each doctor blade chamber is fixed to the doctor blade chamber body by a fixing device comprising a clamp configured to press the doctor blade against a part of the doctor blade chamber body and fixing members. More specifically, the clamping flange is arranged to pinch and/or flatten and hold the doctor blade on the body, and is screwed onto the doctor blade chamber body by screwing members.
  • the squeegee is a long, sharp blade that is dangerous to handle, requiring a full-length applied attachment to a set of screw members to be attached to the doctor blade chamber body.
  • the document US-A-4453463 (see Fig.22) describes a device for fixing a doctor blade to a doctor blade chamber body according to the preamble of claim 1.
  • the object of the present invention is to overcome all or part of the drawbacks described above so as to facilitate the handling of the blades during their installation and their replacement, and thus to minimize the risk of injury to operators, by proposing a fixing device adapted for the blades of doctor blade chambers making it possible to keep the screws in place during the replacement or the installation of the blade on the body of the doctor blade chamber.
  • the first fastening member comprises at least a first retaining section having an upper end and a lower end, a second section different from the first retaining section, and
  • the doctor blade can be put in place or changed without the fixing device being completely removed and then replaced, which avoids the loss of fixing members and limits the number of manipulations of the doctor blade. .
  • the second fixing member is unlocked and the flange is loosened.
  • the flange can remain held attached to the doctor blade body, so that it is possible to remove or put in place the doctor blade without having to completely remove the fastening device.
  • the operator's attention is focused solely on the doctor blade, which considerably reduces the risk of injury or incorrect positioning of the doctor blade on the doctor blade chamber body. Due to the simplified unblocking operations, there is no longer any need for several operators to set up or change a doctor blade.
  • the first retaining section of the first fixing member and the second portion may have at least one retaining element of the second fixing member cooperating by form complementarity.
  • the first retaining section of the first fixing member may be provided with a thread shaped to cooperate with a retaining element arranged on the second portion of the second fixing member and/or with a retaining element arranged on the first portion of the second fixing device.
  • the first fixing member may be intended to be inserted directly or indirectly into an orifice provided on the doctor blade chamber body.
  • the first fixing member may be an insert comprising an outer surface on which is provided at least partially a retaining element, preferably a thread intended to cooperate with a third fixing member. Thanks to the third fixing member, the first fixing member is inserted indirectly into an orifice provided on the doctor blade chamber body.
  • the first fixing member may be generally cylindrical in shape.
  • the first retainer section of the first fastener and the second retainer section of the first fastener may be contiguous.
  • the first retaining section of the first fastening member may have a width or a diameter that is substantially less than a width or the diameter of the second retaining section of the first fastening member.
  • the first retaining section of the first fastener may have a height strictly less than the height of the intermediate portion of the second fixing member.
  • the first retaining section of the first fixing member may have a height less than or equal to the height of the second portion having at least one retaining element of the second fixing member and/or to the height of the first portion having at least one retaining element of the second fastener.
  • the second fixing member can be movable in a clamping position in which the second portion of the second fixing member is entirely in the first retaining section and is preferably in abutment against the lower end of the first retaining section so that the clamping flange is pressed towards the body on the doctor blade.
  • the intermediate portion and the first portion of the second fixing member are both arranged in the second section of the first fixing member.
  • the retaining element of the first portion of the second fixing member may be a complementary thread to the thread provided on the first retaining section of the first fixing member.
  • the intermediate portion of the second fixing member may be smooth.
  • the intermediate portion of the second fixing member has a cross section substantially smaller than the cross section of the first portion and/or of the second portion.
  • the first portion having at least one retaining element of the second fixing member can be distinct and arranged at a distance from the second portion having at least one retaining element of the second fixing member.
  • the height of the intermediate portion of the second fixing member can be configured to define a free sliding distance of the second fixing member in the first fixing member.
  • the free sliding distance can be determined to correspond to a sufficient spacing of the flange relative to the doctor blade chamber body, so as to define a space for extracting or inserting the doctor blade.
  • the fixing device may comprise a set of first fixing members and a set of second fixing members, each first fixing member cooperating with a second fixing member.
  • the second fixing member may comprise a first end on which is arranged the first portion having at least one retaining element.
  • the second fixing member may comprise a second end equipped with a head.
  • the second portion having at least one retaining element of the second fixing member can be arranged between the first end and the second end and preferably under the head of the second fixing member.
  • the second end of the second fixing member may comprise at least one gripping member.
  • the head of the second end can be equipped with a bearing portion intended to come into abutment and to be centered in a housing provided on the clamping flange.
  • the second fixing member may take the form of a double-threaded screw.
  • the second fixing member can comprise a rod on which the first portion having at least one retaining element, the second portion having at least one retaining element and the intermediate portion are arranged.
  • the securement device may include a third securement member including an internal cavity configured to at least partially house the first securement member.
  • the first fixing member may comprise an outer surface on which is provided at least partially a cooperation element configured to cooperate with a complementary element provided in the internal cavity of the third fixing member.
  • the third fixing member may have a flared bearing portion intended to rest on the internal surface of the doctor blade chamber body.
  • the third member may further comprise an upper end forming a collar projecting relative to the outer surface of the doctor blade chamber body, and serving as a stop for the doctor blade.
  • the third fixture may include a lower end for extending into the doctor blade chamber body and configured to at least partially house the first fixture.
  • the internal cavity can be a through orifice or a blind orifice, formed at least as far as the lower end of the third fixing member.
  • the third fixing member may be generally cylindrical in shape.
  • the clamping flange may comprise a housing shaped to receive a bearing portion of the head of the second end of the second fixing member.
  • the invention also relates to a doctor blade chamber comprising at least one elongated body extending along a longitudinal axis and comprising a first portion on which a first doctor blade is fixed by at least one fixing device according to the invention.
  • the body may comprise at least a second portion on which a second doctor blade is fixed by at least one second fixing device according to the invention, the second doctor blade being arranged facing the first doctor blade with respect to the longitudinal axis of the body.
  • the first portion of the body can be equipped with a set of orifices each intended for the insertion of at least a first fixing member or at least a third fixing member.
  • the second portion of the body can be equipped with a set of orifices each intended for the insertion of at least a first fixing member or at least a third fixing member.
  • the third fastener can be crimped into the hole in the doctor blade chamber body.
  • a printing unit 100 comprises a plate cylinder 104 configured to support a plate or printing form 108, a screen cylinder or anilox cylinder 103, presenting on its surface a set of cells intended to collect ink in quantity controlled by the volume of the cells, the anilox cylinder 103 being configured to transfer the ink onto the plate 108, a doctor blade chamber 101, configured to fill the cells of the anilox cylinder 103, a pump 102 ensuring the routing of the ink from the ink reservoir 107 to the doctor blade chamber 101, and a back pressure cylinder 105 holding the substrate 106 being printed against the plate cylinder 104, and thus against the plate 108.
  • Doctor blade chamber 1 comprises an elongated body 2 extending along a longitudinal axis XX and comprising a first portion 2a configured to receive a first doctor blade 3.
  • Body 2 further comprises a second portion 2b configured to receive a second doctor blade 3 (see Figs. 2 and 3 ).
  • the body 2 comprises a third portion 2c connecting the first portion 2a and the second portion 2b, a second cavity intended to receive ink and delimited at least by the first portion 2a, the second portion 2b and the third portion 2c.
  • each doctor blade 3 is held on the body 2 of doctor blade chamber 1 by a fixing device 10 according to the invention ( Figs. 4 to 9 ).
  • the doctor blade chamber 1 is equipped with two fixing devices 10.
  • the body 2 of doctor blade chamber 1 comprises a set of orifices 2d extending along the first portion 2a and along the second portion 2b of the body 2 ( Fig. 3 ).
  • the holes 2d are regularly spaced along each portion 2a, 2b of the body 2.
  • Each hole 2d is shaped to receive an insert corresponding to the third fixing member 40 of the fixing device 10 in a preferred and illustrated embodiment.
  • each orifice 2d is shaped to receive an insert corresponding to the first fixing member 20.
  • the fixing device 10 comprises a clamping flange 11 configured to press the doctor blade 3 onto the body 2 of the doctor blade chamber 1 ( Figs. 4 to 9 ).
  • the clamping flange 11 can be of the same length as the doctor blade 3 or of different (lower) length.
  • the fixing device 10 may comprise several clamping flanges 11 placed end to end so as to cover the length of the squeegee 3.
  • the fastening device 10 comprises a first fastening member 20, a second fastening member 30 and a third fastening member 40 (see Fig. 6 ). It should be noted that the Figs. 2 to 9 illustrate the preferred mode of the invention in which the fixing device 10 comprises a third fixing member 40 which could be considered as optional according to the invention.
  • the flange 11 is arranged between the first fixing member 20 and the second fixing member 30.
  • the third fixing member 40 is generally cylindrical in shape ( Fig. 4 ). As can be seen on the Fig. 4 in particular, the third fixing member 40 comprises an internal cavity 43 configured to at least partially house the first fixing member 20, visible in particular in Fig. 5 .
  • the third fixing member 40 comprises an upper end 41 intended to be flush with the body 2 of the doctor blade chamber 1 and a lower end 42 intended to extend into the body 2 of the doctor blade chamber 1 and configured to at least partially house the first fixing member 20.
  • the internal cavity 43 is a through hole or a blind hole, made at least as far as the lower end 42 of the third fixing member 40.
  • the internal cavity 43 is equipped (see Fig.
  • the third fixing member 40 comprises a flared portion 45 arranged between the upper end 41 and the lower end 42 of the third fixing member 40.
  • the flared portion 45 is a support portion intended to rest on the internal surface of the body 2 of the doctor blade chamber 1.
  • the first fixing member 20 is generally cylindrical in shape ( Fig. 5 ).
  • the first fixing member 20 comprises at least a first retaining section 21 having an upper end 21a and a lower end 21b and a second section 22 different from the first retaining section 21.
  • the first retaining section 21 and the second section 22 are contiguous.
  • the first retaining section 21 has a width or a diameter substantially less than the width or the diameter of the second section 22.
  • the first retaining section 21 is provided with a retaining element 23 preferably a thread intended to cooperate with an element retainer 34b formed on the second fixing member 30.
  • the first fixing member 20 comprises an outer surface on which is provided at least partially a retaining element 24 in the form a thread complementary to that 44 made in the third fixing member 40.
  • the second fixing member 30 is configured to cooperate with the first fixing member 20 ( Fig. 6 ).
  • the second fixing member 30 comprises at least a first portion 31 having at least one retaining element 34a, a second portion 32 having at least one retaining element 34b, an intermediate portion 33 devoid of retaining element and arranged between the first portion 31 and the second portion 32.
  • the second fixing member 30 is movable in the first fixing member 20 between at least a first locking position and an unlocking position ( Fig. 8 ).
  • the blocking position consists in that the second portion 32 cooperates with the first retaining section 21 of the first fixing member 20, and the first portion 31 is arranged in the second section 22.
  • the unlocking position consists in that the intermediate portion 33 is positioned at the level of the first retaining section 21 and is free to slide with respect to the first retaining section 21 along a longitudinal axis AA, between a first position end in which the second portion 32 of the second fixing member 30 is in abutment on the upper end 21a of the first retaining section 21, and a second extreme position in which the first portion 31 of the second fixing member 30 is in abutment on the lower end 21b of the first retaining section 21 ( Fig. 7 ).
  • the first portion 31 of the second fixing member 30 is arranged in the second section of the first fixing member 20.
  • the second portion 32 of the second fixing member 30 is outside, it that is to say completely disengaged from the first fixing member 20.
  • the first retaining section 21 has a height strictly lower than the height of the intermediate portion 33, which allows free sliding from one end position to another. Furthermore, the first retaining section 21 has a height less than or equal to the height of the second portion 32 and/or the height of the first portion 31.
  • the height of the intermediate portion 33 is configured to define a free sliding distance of the second fixing member 30 in the first fixing member 20, the free sliding distance being determined to correspond to a sufficient spacing of the flange with respect to the doctor blade chamber body, so as to define a space d extraction or insertion of the doctor blade (see Fig. 9 ).
  • the second fixing member 30 can also be in a clamping position in which the second portion 32 of the second fixing member 30 is entirely in the first retaining section 21 and is preferably in abutment against the lower end 21b of the first retaining section 21 so that the flange 11 is pressed towards the body on the doctor blade ( Fig. 8 ).
  • the intermediate portion 33 and the first portion 31 of the second fixing member 30 are both arranged in the second section 22 of the first fixing member 20.
  • the second fixing member 30 can also be in an intermediate release position, in which the intermediate portion 33 is not free to slide and the second portion 32 is partially engaged in the first retaining section 21.
  • the retaining element 34a of the first portion 31 is a thread complementary to the thread 23 provided on the first retaining section 21 ( Fig. 6 ).
  • the retaining element 34b of the second portion 32 is a thread complementary to the thread 23 made on the first retaining section 21.
  • the intermediate portion 33 is smooth.
  • the second fixing member 30 comprises a first end 35 on which the first portion 31 is arranged and a second end 36 equipped with a head, the second portion 32 being arranged between the first end 35 and the second end 36 and preferably under the head of the second fixing member 30 ( Fig. 6 ).
  • the second end 36 of the second fixing member 30 comprises at least one gripping member 37.
  • the head of the second end 36 is equipped with a support portion 38 intended to come to rest in a housing (not shown) provided on the clamping flange 11.
  • the second fixing member 30 is in the form of a double-threaded screw, comprising a rod on which the first portion 31, the second portion 32 and the intermediate portion 33 are arranged.
  • Each fixing device 10 comprises a set of first fixing members 20, a set of second fixing members 30, each first fixing member 20 cooperating with a second fixing member 30 ( Fig. 2 ).
  • the clamping flange 11 comprises a pinching portion 12 intended to be in contact and resting on the doctor blade 3 ( Fig. 6 ).
  • the clamping flange 11 further comprises a bearing portion 13 opposite the pinching portion 12 and configured to rest on the body 2 of doctor blade chamber 1.
  • the clamping flange 11 comprises a housing (not shown) shaped to receive the bearing portion 38 of the head of the second end 36 of the second fixing member 30.
  • a third fixing member 40 ( Fig. 4 ).
  • the third fixing member 40 is crimped onto the body 2.
  • the first fixing member 20 is inserted into the third fixing member 40 ( Fig. 5 ).
  • the first member 20 is preferably screwed into the third fixing member 40.
  • the clamping flange 11 is positioned on the body 2 of doctor blade chamber 1 and the second fixing member 30 is inserted through the clamping flange 11 into the first fixing member 20, by screwing the first portion 31 of the second fixing member 30 until the first portion 31 of the second fixing member 30 is located in the second section 22 of the first fixing member 20 and the second fixing member 30 is in the unlocking position ( Fig. 7 ).
  • the doctor blade 3 can easily be inserted into the space between the pinching portion 12 of the flange and the body 2 by moving the second fixing member and the clamping flange 11, along the longitudinal sliding axis AA.

Landscapes

  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Coating Apparatus (AREA)
  • Screen Printers (AREA)
  • Paper (AREA)
EP19721191.5A 2018-04-30 2019-04-26 Dispositif de fixation d'une racle sur un corps de chambre a racles et chambre a racles ainsi equipee Active EP3787899B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1800384A FR3080568B1 (fr) 2018-04-30 2018-04-30 Dispositif de fixation d'une racle sur un corps de chambre a racles
PCT/EP2019/025130 WO2019211005A1 (fr) 2018-04-30 2019-04-26 Dispositif de fixation d'une racle sur un corps de chambre a racles et chambre a racles ainsi equipee

Publications (2)

Publication Number Publication Date
EP3787899A1 EP3787899A1 (fr) 2021-03-10
EP3787899B1 true EP3787899B1 (fr) 2022-06-15

Family

ID=63209455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19721191.5A Active EP3787899B1 (fr) 2018-04-30 2019-04-26 Dispositif de fixation d'une racle sur un corps de chambre a racles et chambre a racles ainsi equipee

Country Status (9)

Country Link
US (1) US11420436B2 (ko)
EP (1) EP3787899B1 (ko)
JP (1) JP7015943B2 (ko)
KR (1) KR102394966B1 (ko)
CN (1) CN112055656B (ko)
DK (1) DK3787899T3 (ko)
ES (1) ES2923373T3 (ko)
FR (1) FR3080568B1 (ko)
WO (1) WO2019211005A1 (ko)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453463A (en) * 1981-07-13 1984-06-12 Dahlgren Harold P Inking systems
DK1196287T3 (da) 1999-06-22 2003-06-10 Tresu Production As Rakelsystem
DE10255411A1 (de) * 2002-11-28 2004-06-24 Windmöller & Hölscher Kg Farbkammerrakel
AU2003246742A1 (en) * 2003-07-10 2005-01-28 Comexi, Sa Device for fixing scraper strips to a printing roller scraper
DE102007027384A1 (de) * 2007-06-11 2009-03-12 Windmöller & Hölscher Kg Farbkammerrakel in einem Farbwerk einer Rotationsdruckmaschine sowie Verfahren zur Herstellung einer Farbkammerrakel
EP3302979A4 (en) * 2015-06-04 2019-02-20 Tresu A/S COMPOSITE ROOT CHAMBER

Also Published As

Publication number Publication date
US11420436B2 (en) 2022-08-23
FR3080568A1 (fr) 2019-11-01
KR20200136026A (ko) 2020-12-04
WO2019211005A1 (fr) 2019-11-07
DK3787899T3 (da) 2022-07-18
FR3080568B1 (fr) 2020-04-03
EP3787899A1 (fr) 2021-03-10
JP7015943B2 (ja) 2022-02-03
KR102394966B1 (ko) 2022-05-04
ES2923373T3 (es) 2022-09-27
CN112055656B (zh) 2022-01-14
US20210031506A1 (en) 2021-02-04
JP2021519712A (ja) 2021-08-12
CN112055656A (zh) 2020-12-08

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