US3884145A - Doctor blade for photogravure printing machine - Google Patents

Doctor blade for photogravure printing machine Download PDF

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Publication number
US3884145A
US3884145A US397877A US39787773A US3884145A US 3884145 A US3884145 A US 3884145A US 397877 A US397877 A US 397877A US 39787773 A US39787773 A US 39787773A US 3884145 A US3884145 A US 3884145A
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US
United States
Prior art keywords
doctor blade
contact surface
longitudinal edge
blade assembly
edge
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.)
Expired - Lifetime
Application number
US397877A
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English (en)
Inventor
Max Datwyler
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.)
Daetwyler Global Tec Holding AG
Original Assignee
Max Daetwyler and Co
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 Max Daetwyler and Co filed Critical Max Daetwyler and Co
Application granted granted Critical
Publication of US3884145A publication Critical patent/US3884145A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1072—Blade construction

Definitions

  • a doctor blade assembly for photogravure printing machines for the removal of excess printing ink from a printing surface comprising an elongated doctor blade having opposite longitudinal edge portions one of which has a contact surface adapted to contact a printing surface, a strengthening element secured to said doctor blade therealong and having a longitudinal edge terminating short of the contact surface, a plurality of individually connected though sequentially removable means between the longitudinal edge and the contact surface for supportive back-up of said one edge portion and for sequentially reducing the length of the removable means in a direction away from the contact surface whereby the distance between the last of the removable means and the contact surface is maintained essentially constant during the progressive wear of the doctor blade one edge portion.
  • the present invention relates to a new and improved construction of a doctor blade assembly for photogravure printing machines for the removal of printing ink or the like from a printing surface, in particular from a printing cylinder.
  • doctor blade In order to prevent the above-discussed undesirable effects the doctor blade must be frequently replaced and reground, each time requiring standstill of the printing machine.
  • Another and more specific object of the present invention relates to a new and improved construction of a doctor blade assembly which overcomes the aforementioned drawbacks and wherein wear of the doctor blade bevel contacting the printing surface does not produce any impairment in the ink wiping action of the doctor blade.
  • the doctor blade assembly of the previously mentioned type is manifested by the features that there is provided a doctor blade which has a contact surface which contacts the printing surface and this doctor blade is connected with a strengthening element.
  • the strengthening element terminates at a spacing from the contact surface of the doctor blade, and at the end of such support element which confronts the contact surface is provided a number of individual sections. These individual sections are connected with one another and are individually removable so that by removing individual sections the spacing or distance between the contact surface of the doctor blade and the last of the individual sections is maintained essentially constant during the progressive wear of the contact surface.
  • FIG. 1 is a schematic sectional view of a first exemplary embodiment of a doctor blade assembly for photogravure printing machines and designed according to the teachings of the present invention
  • FIG. 2 is a second embodiment of a doctor blade assembly
  • FIG. 3 is a third embodiment of a doctor blade assembly
  • FIG. 4 is a fourth embodiment of a doctor blade assembly
  • FIG. 5 is a fifth embodiment of a doctor blade assembly designed according to the invention.
  • doctor blade 1 extends over the entire width of the doctor blade assembly and is delimited or bounded by two boundary surfaces 2 and 3 which are essentially parallel to one another.
  • the doctor blade 1 possesses a contact surface 4 which extends at an inclination with respect to the surfaces 2 and 3, as shown, and also bears against the printing cylinder Z.
  • this contact surface 4 of the doctor blade is also sometimes referred to in the art as the doctor blade bevel. Since the spacing between both surfaces 2 and 3 remains constant the width of the doctor blade bevel 4 essentially remains constant during wear of the scraper element 1.
  • the doctor blade 1 Since the width of the doctor blade bevel 4 should not exceed a certain or predetermined value, which for instance is in the order of magnitude of about 50 pm, in order to obtain at any time a sufficiently satisfactory wiping of the ink from the surface of the printing cylinder, the doctor blade 1 must be constructed correspondingly thin. In order to impart to such thin doctor blade 1 a sufficient bending strength it is connected with a strengthening element 5.
  • this strengthening element 5 embodies a strengthening member 6 secured at the surface 2 of the doctor blade 1, and at one end 6a of such strengthening member 6 there are means in the form of a number of individual abutting sections 7. These sections 7 are connected at their joint surfaces with one another, as will be explained more fully hereinafter, for instance by adhesively bonding the same, and with the doctor blade 1 in such a way that in each instance individual sections can be detached from the neighboring sections.
  • the end 8 of the last section which bears against the doctor blade 1 extends at a spacing from a longitudinal edge 9 of the contact surface 4 of the doctor blade 1 and which edge 9 bears against the printing cylinder Z.
  • the section 7 thereby collectively define a plurality of individually connected though sequentially removable means 7 between a longitudinal edge or end (unnumbered) of the strengthening element 6 and the contact surface 4 or edge 9 of the doctor blade 1 for supportive back-up thereof and for sequentially reducing the length of the removable means 7 in a direction away from the contact surface 4 whereby the distance between the last of the removable means 7 and the contact surface 4 is maintained essentially constant during the progressive wear of the doctor blade 1.
  • doctor blade I and the strengthening element prior to attachment are adjusted with regard to their mutual position by means of a centering tool inserted into the bores 10 and 10a of such components.
  • FIGS. 2 to 5 The exemplary embodiments of doctor blades depicted in FIGS. 2 to 5 respectively, essentially correspond to the exemplary embodiment of doctor blade assembly above in connection with FIG. 1 and only deviate therefrom in the construction of the sections 7.
  • the sections 7 possess extended portions or extensions 11 which bear in superimposed fashion upon the strengthening member 6. These extensions or extended portions 11 are detachably connected with one another and the lowermost extension or extended portion 11 is additionally connected with the strengthening member 6.
  • the mutually abutting sections 7 are connected with one another at their abutting or joint surfaces, whereas with the exemplary embodiment of FIG. 3 the sections 7 are arranged at a spacing from one another in the direction of the doctor blade bevel 4.
  • the connection of these sections 7 occurs solely via the abutting and detachable interconnected extension or extended portions 11 of such sections 7.
  • detachment techniques which can be conceivably employed, for instance based upon mechanical, chemical or electrical principles. Such techniques also can be combined with a suitable measuring device which measures the length of the portion la of the doctor blade 1 which protrudes past the support element 5 and as a function of the wear of the doctor blade end automatically brings about removal or detachment of a section 7.
  • the strengthening member 6, the sections 7 and the extensions or extended portions 11 there are employed suitable materials for the relevant doctor blade constructions.
  • the doctor blade there is preferably used a metallic material, whereas the remaining components 6, 7 and 11 for instance are formed of plastic or a metallic material.
  • connection means which, on the one hand, ensure for a permanent connection in order to avoid any undesired detachment of the individual sections 7 and the connection or extended portions 11, and on the other hand, when required, still permit of an effortless detachment of such components. All of these requirements can be fulfilled by connection means for instance in the form of suitable commercially available adhesives; furthermore, connections of the desired type also can be obtained by means of suitable weldingand soldering procedures, as schematically indicated by reference character 20 for instance in FIG. 1.
  • a doctor blade assembly for photogravure printing machines for the removal of excess printing ink from a printing surface comprising an elongated doctor blade having opposite longitudinal edge portions one of which has a contact surface adapted to contact a printing surface, a strengthening element secured to said doctor blade therealong and having a longitudinal edge terminating short of said contact surface, a plurality of individually connected though sequentially removable means between said longitudinal edge and said contact surface for supportive back-up of said one edge portion and for sequentially reducing the length of said removable means in a direction away from said contact surface whereby the distance between the last of said removable means and said contact surface is maintained essentially constant during the progressive wear of said doctor blade one edge portion.
  • doctor blade assembly as defined in claim 1 wherein said removable means extend longitudinally along the length of said doctor blade.
  • doctor blade assembly as defined in claim 1 wherein said removable means are a plurality of elongated sections extending longitudinally along the length of said doctor blade.
  • doctor blade assembly as defined in claim 3 wherein said sections are connected with one another by an adhesive.
  • doctor blade assembly as defined in claim 3 wherein said sections are connected with one another by welding.
  • doctor blade assembly as defined in claim 3 wherein said sections are connected with one another by soldering.
  • doctor blade assembly as defined in claim 3 wherein said elongated sections are disposed in shinglelike fashion upon said doctor blade.
  • each elongated section has a first longitudinal edge generally parallel to said doctor blade and a second longitudinal edge directed at a downwardly directed incline in a direction toward said contact surface.
  • each elongated section has a first longitudinal edge generally parallel to said doctor blade, a second longitudinal edge directed at a downwardly directed incline in a direction toward said contact surface, and said second longitudinal edges are in spaced relationship to each other.
  • each elongated section has a first longitudinal edge generally parallel to said doctor blade, a second longitudinal edge directed at a downwardly directed incline in a direction toward said contact surface, and said second longitudinal edges are in spaced parallel relationship to each other.
  • each elongated section has an edge resting

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Screen Printers (AREA)
US397877A 1972-09-19 1973-09-17 Doctor blade for photogravure printing machine Expired - Lifetime US3884145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1370672A CH542719A (de) 1972-09-19 1972-09-19 Rakel für Tiefdruckmaschinen

Publications (1)

Publication Number Publication Date
US3884145A true US3884145A (en) 1975-05-20

Family

ID=4394650

Family Applications (1)

Application Number Title Priority Date Filing Date
US397877A Expired - Lifetime US3884145A (en) 1972-09-19 1973-09-17 Doctor blade for photogravure printing machine

Country Status (10)

Country Link
US (1) US3884145A (enrdf_load_stackoverflow)
JP (1) JPS5229645B2 (enrdf_load_stackoverflow)
CA (1) CA986783A (enrdf_load_stackoverflow)
CH (1) CH542719A (enrdf_load_stackoverflow)
DE (1) DE2246991B2 (enrdf_load_stackoverflow)
FR (1) FR2200115B1 (enrdf_load_stackoverflow)
GB (1) GB1419874A (enrdf_load_stackoverflow)
IT (1) IT993323B (enrdf_load_stackoverflow)
NL (1) NL7312909A (enrdf_load_stackoverflow)
SE (1) SE392839B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638751A (en) * 1994-10-26 1997-06-17 Max Daetwyler Corporation Integrated doctor blade and back-up blade
US20030089208A1 (en) * 2001-11-12 2003-05-15 Metso Paper, Inc. Apparatus for measuring the wear of a doctor blade and method in measuring the wear of a doctor blade and in controlling a paper machine
US6684766B1 (en) * 1999-06-22 2004-02-03 Dek International Gmbh Wiper blades for screen printing
US20090308270A1 (en) * 2006-08-29 2009-12-17 Daetwyler Swisstec Ag Doctor blade

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5213103U (enrdf_load_stackoverflow) * 1975-07-15 1977-01-29
JPS59127084A (ja) * 1983-01-11 1984-07-21 Canon Inc ブレード装置，クリーニング装置および画像形成装置
GB9208003D0 (en) * 1992-04-10 1992-05-27 Vickerys Ltd A mounting assembly
JPH06282122A (ja) * 1992-04-16 1994-10-07 Canon Inc ブレード部材、ブレード部材取り付け方法、プロセスカートリッジ、プロセスカートリッジの組立て方法及び画像形成装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1760049A (en) * 1929-02-27 1930-05-27 August Bender Engraving-press attachment
US3040442A (en) * 1959-04-27 1962-06-26 Lyle S Overton Blade assembly for drum dryers or the like
US3122767A (en) * 1962-07-23 1964-03-03 Bird Machine Co Sectional doctor blade holder
US3649991A (en) * 1968-10-01 1972-03-21 Vlckerys Ltd Doctors for paper making machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1760049A (en) * 1929-02-27 1930-05-27 August Bender Engraving-press attachment
US3040442A (en) * 1959-04-27 1962-06-26 Lyle S Overton Blade assembly for drum dryers or the like
US3122767A (en) * 1962-07-23 1964-03-03 Bird Machine Co Sectional doctor blade holder
US3649991A (en) * 1968-10-01 1972-03-21 Vlckerys Ltd Doctors for paper making machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638751A (en) * 1994-10-26 1997-06-17 Max Daetwyler Corporation Integrated doctor blade and back-up blade
US6684766B1 (en) * 1999-06-22 2004-02-03 Dek International Gmbh Wiper blades for screen printing
US20030089208A1 (en) * 2001-11-12 2003-05-15 Metso Paper, Inc. Apparatus for measuring the wear of a doctor blade and method in measuring the wear of a doctor blade and in controlling a paper machine
US6830659B2 (en) * 2001-11-12 2004-12-14 Metso Paper, Inc. Apparatus for measuring the wear of a doctor blade and method in measuring the wear of a doctor blade and in controlling a paper machine
US20090308270A1 (en) * 2006-08-29 2009-12-17 Daetwyler Swisstec Ag Doctor blade

Also Published As

Publication number Publication date
DE2246991A1 (de) 1974-04-04
JPS4970706A (enrdf_load_stackoverflow) 1974-07-09
SE392839B (sv) 1977-04-25
CA986783A (en) 1976-04-06
CH542719A (de) 1973-10-15
NL7312909A (enrdf_load_stackoverflow) 1974-03-21
DE2246991B2 (de) 1976-02-05
FR2200115B1 (enrdf_load_stackoverflow) 1977-08-12
JPS5229645B2 (enrdf_load_stackoverflow) 1977-08-03
IT993323B (it) 1975-09-30
FR2200115A1 (enrdf_load_stackoverflow) 1974-04-19
GB1419874A (en) 1975-12-31

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