US3878780A - Resiliently supported air bladder for biasing squeegees - Google Patents

Resiliently supported air bladder for biasing squeegees Download PDF

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Publication number
US3878780A
US3878780A US429367A US42936773A US3878780A US 3878780 A US3878780 A US 3878780A US 429367 A US429367 A US 429367A US 42936773 A US42936773 A US 42936773A US 3878780 A US3878780 A US 3878780A
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US
United States
Prior art keywords
doctor
holder
strip
bladder
blade
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
US429367A
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English (en)
Inventor
Andre Lotte
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.)
Alsacienne de Constructions Mecaniques SA
Original Assignee
Alsacienne de Constructions Mecaniques SA
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Publication date
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Publication of US3878780A publication Critical patent/US3878780A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors

Definitions

  • doctor blade holder comprising at least one bar which is placed transversely to the direction of feed of the material to be printed and is held in position at its extremities by means of stationary supports which are adjustable for height and mounted on both sides of the frame of the machine.
  • One of the means commonly employed up to the present time for the purpose of overcoming this disadvantage while at the same time permitting easy adjustment of the pressure applied by the doctor blade against the screen consists in interposing a pneumatic bladder between the blade-holder and the doctor blade itself in proximity to the free edge of this latter, with the bladder being constituted by an inflatable tube, the pressure of which can be adjusted.
  • the object of this invention is to solve the problem discussed in the foregoing.
  • the invention is directed to a doctor-blade system for a screen printing machine of the type aforesaid, that is to say which comprises a blade-holder, a doctor blade constituted by a thin flexible strip which is attached to said blade-holder at the edge opposite to the free wiping edge and a pneumatic pressure bladder which is interposed between the blade-holder and the doctor blade in the vicinity of the free edge of said blade in order that a predetermined pressure may be applied by said free edge against the screen, said doctor-blade system being distinguished by thefact that said pneumatic pressure bladder is brought to bear against the bladeholder by means of at least one intermediate bendingcompensation bearing member having at least one portion which is capable of elastic displacement in response to the bending deformations to which the bladeholder is subjected.
  • the blade-holder is placed within a rotary cylindrical screen.
  • the deflection to which the blade-holder is subjected can be compensated for by the elastic deformation of the intermediate member, with the result that the free edge of the doctor blade can be applied against the screen with a constant pressure over the entire length of said blade.
  • the intermediate bearing member is constituted by a resilient metallic sectional strip, one flange of which is rigidly fixed to the blade-holder and the other flange of which is capable of elastic displacement when the blade-holder undergoes deflection and serves as a bearing surface for the pneumatic bladder.
  • FIG. 1 is a sectional view of one embodiment of a doctor-blade system in accordance with the invention.
  • FIGS. 2 and 3 are sectional views of two further embodiments of the invention.
  • the doctor-blade system shown in FIG. 1 essentially comprises a doctor blade holder 2 and adoctor blade 4.
  • the blade-holder passes within the interior of a rotary screen 6 which is in contact with a web 8 of material to be printed which consists of either fabric or paper, with the web 8 being displaced by a belt 10 which passes over carrier rollers 12.
  • the blade-holder 2 constitutes a frame which is intended to be endowed with maximum rigidity in order to reduce the amount of deflection to which said frame is subjected during operation.
  • said blade-holder can have a length of the order of 2.4 to 4 meters and is supported only at both ends externally of the cylindrical screen.
  • the bladder 28 is not directly applied against a rigid portion of the bladeholder but against a flexible intermediate member which, in the case of FIG. 1, is constituted by a flexible metallic strip 30.
  • a flexible metallic strip 30 is rigidly fixed within the blade-holder, for example, by means of a clamping-screw 32 with the interposition of a packing-strip 33.
  • the opposite edge of the flexible strip 30 against which the bladder 28 is applied is therefore free to bend elastically between positions 30' and 30 which are shown in broken lines in FIG. 1, with the distance between these end positions having been exaggerated for the sake of enhanced clarity of the drawing.
  • any given point of the blade-holder such as extremity 35 of the sectional member 26, for example, is located at a greater distance from the free edge 14 of the doctor blade 4 in the central portion of said blade than in the vicinity of the extremities.
  • the intermediate bearing member 30 occupies the position 30", for example; under the action of deflection of the blade-holder, said member willtake up a higher position such as the position 30, for example, in the central portion of the blade-holder and an even higher position such as the position 30, for example, near the ends of the bladeholder. It is therefore apparent that, in spite of the deflection to which the blade-holder is subjected, the bladder 28 will receive from the strip 30 a substantially constant bearing reaction over the entire length of the doctor blade 4 and that said blade will consequently be applied against the screen with a pressure which is substantially constant over the entire length of the free edge 14 of the doctor blade.
  • the bladder 28 can bear directly against the doctor blade 4 but, as shown in FIG. 1, it is more advantageous to interpose a shoe 36 which is capable of sliding within the blade-holder in a direction F when the bladder 28 is inflated or deflated and which is applied against the doctor blade 4 by means of a narrow surface in the form of a ridge or rib 37.
  • a edge 38 of the doctor blade 4 which is opposite to the free edge 14 is secured to the blade-holder by any usual means such as screws 39 (shown only in FIG. 3) which serve to clamp the blade 4 against the portion of the blade-holder.
  • a pneumatic locking bladder 40 (FIG. 2) which, in the inflated state, locks the blade 4 against the angle-bar 24 of the blade-holder or against any other equivalent portion of said bladeholder.
  • FIG. 2 an alternative embodiment comprising a number of elements which are identical with those of FIG. 1 and are designated by the same reference numerals.
  • the flexible bearing member against which the pneumatic bladder 28 is applied is no longer constituted by a flat strip but by a sectional strip 42, one flange 44 of which is attached to the blade-holder and rigidly fixed to this latter.
  • the second flange 46 of the sectional strip absorbs the bearing reaction transmitted by the bladder while bending to a greater or lesser extent, thereby compensating for irregularities of pressure resulting from deflection of the blade-holder.
  • the flexible bearing member of the bladder 28 is also constituted by a sectional strip 48 but in this case the flange 50 of the sectional strip which is rigidly fixed to the blade-holder is secured to an external face of this latter, for example to the sectional member 26' and no longer towards the interior of the blade-holder.
  • the operation is identical with that of the embodiment described earlier.
  • doctor blades in accordance with the invention could cooperate with impression cylinders such as a cylinder 52'shown in FIG. 3 instead of screens.
  • doctor blades of this type can be employed not only in the field of printing on paper or fabrics but also for all coating operations.
  • An apparatus for use with a printing machine having a screen comprising an elongated doctor-holder, I
  • a doctor including an elongated strip of thin flexible material having one longitudinal securing marginal portion secured in said doctor-holder and an opposite longitudinal free wiping marginal portion to be operably engaged against the screen of said printing machine,
  • an elongated pneumatic pressure bladder longitudinally disposed in said doctor-holder and having an operating face operably contacting said doctor intermediate said marginal portions of said doctor adjacent said wiping marginal portion and an oppositely directed backing face, and
  • doctor-holder is provided with a longitudinal recess having a supporting face and an opposite backing face, said securing marginal portion of said doctor being engaged in said recess against said supporting face thereof, and a further elongated penumatic bladder longitudinally arranged in said recess between said backing face thereof and said securing marginal portion of said doctor.
  • doctor-blade system according to claim 1, wherein the doctor is fabricated from a strip of steel and especially stainless steel having a thickness of approximately l/lO mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Rotary Presses (AREA)
US429367A 1973-01-02 1973-12-28 Resiliently supported air bladder for biasing squeegees Expired - Lifetime US3878780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7300011A FR2212238B1 (enrdf_load_html_response) 1973-01-02 1973-01-02

Publications (1)

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US3878780A true US3878780A (en) 1975-04-22

Family

ID=9112816

Family Applications (1)

Application Number Title Priority Date Filing Date
US429367A Expired - Lifetime US3878780A (en) 1973-01-02 1973-12-28 Resiliently supported air bladder for biasing squeegees

Country Status (8)

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US (1) US3878780A (enrdf_load_html_response)
JP (1) JPS506416A (enrdf_load_html_response)
AT (1) AT327145B (enrdf_load_html_response)
CH (1) CH572810A5 (enrdf_load_html_response)
DE (1) DE2365099A1 (enrdf_load_html_response)
FR (1) FR2212238B1 (enrdf_load_html_response)
IT (1) IT1002470B (enrdf_load_html_response)
NL (1) NL7317687A (enrdf_load_html_response)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952650A (en) * 1973-09-21 1976-04-27 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor-blade holder with cleaning means
US4030410A (en) * 1973-02-14 1977-06-21 Peter Zimmer Dyestuff applicator for screen printer
US4038919A (en) * 1975-02-25 1977-08-02 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor blade holders for screen process printing machines
US4078486A (en) * 1975-02-24 1978-03-14 Fritz Buser Ag Maschinenfabrik Doctoring device with blade cushioning mount
EP0011314A1 (en) * 1978-11-14 1980-05-28 Stork Brabant B.V. Squeegee for screen printing machine
US4232601A (en) * 1976-07-20 1980-11-11 Mitter & Co. Squeegee arrangement
US5103732A (en) * 1991-02-14 1992-04-14 Ward Holding Company, Inc. Doctor blade head assembly and printing apparatus therewith
US5134958A (en) * 1987-10-10 1992-08-04 Johannes Zimmer Doctor apparatus for applying fluid material to a substrate
US6041709A (en) * 1998-11-12 2000-03-28 Usadvantage, Inc. Peristaltic pump for pumping ink or cleaning fluids in a printing machine
US6347582B1 (en) * 1999-06-17 2002-02-19 Heidelberger Druckmaschinen Heidelberg Rotary imprint printing system
US6637330B1 (en) * 1999-06-22 2003-10-28 Tresu Production A/S Doctor blade system
US6730170B1 (en) * 2000-11-17 2004-05-04 National Semiconductor Corporation Encapsulant material applicator for semiconductor wafers and method of use thereof
US20060086268A1 (en) * 2002-07-23 2006-04-27 Steenkamer Arnoldus T Squeegee unit for a rotary screen-printing device
US20070144377A1 (en) * 2004-08-21 2007-06-28 Christoph Henninger Doctor device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109222188A (zh) * 2018-10-29 2019-01-18 中国船舶工业总公司七五研究所宜昌分部 稠浆薄片脱片机及脱片方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579181A (en) * 1948-07-28 1951-12-18 Time Inc Enclosed gravure fountain
US3593663A (en) * 1969-06-03 1971-07-20 Zerand Corp Doctor blade assembly for printing equipment
US3795188A (en) * 1971-03-12 1974-03-05 Reggiani Spa Fluid pressure biased squeegee blade and counter pressure table therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579181A (en) * 1948-07-28 1951-12-18 Time Inc Enclosed gravure fountain
US3593663A (en) * 1969-06-03 1971-07-20 Zerand Corp Doctor blade assembly for printing equipment
US3795188A (en) * 1971-03-12 1974-03-05 Reggiani Spa Fluid pressure biased squeegee blade and counter pressure table therefor

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030410A (en) * 1973-02-14 1977-06-21 Peter Zimmer Dyestuff applicator for screen printer
US3952650A (en) * 1973-09-21 1976-04-27 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor-blade holder with cleaning means
US4078486A (en) * 1975-02-24 1978-03-14 Fritz Buser Ag Maschinenfabrik Doctoring device with blade cushioning mount
US4038919A (en) * 1975-02-25 1977-08-02 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor blade holders for screen process printing machines
US4232601A (en) * 1976-07-20 1980-11-11 Mitter & Co. Squeegee arrangement
EP0011314A1 (en) * 1978-11-14 1980-05-28 Stork Brabant B.V. Squeegee for screen printing machine
US4299164A (en) * 1978-11-14 1981-11-10 Stork Brabant B.V. Squeegee for screen printing machine
US5134958A (en) * 1987-10-10 1992-08-04 Johannes Zimmer Doctor apparatus for applying fluid material to a substrate
US5103732A (en) * 1991-02-14 1992-04-14 Ward Holding Company, Inc. Doctor blade head assembly and printing apparatus therewith
US6041709A (en) * 1998-11-12 2000-03-28 Usadvantage, Inc. Peristaltic pump for pumping ink or cleaning fluids in a printing machine
US6347582B1 (en) * 1999-06-17 2002-02-19 Heidelberger Druckmaschinen Heidelberg Rotary imprint printing system
US6637330B1 (en) * 1999-06-22 2003-10-28 Tresu Production A/S Doctor blade system
US6730170B1 (en) * 2000-11-17 2004-05-04 National Semiconductor Corporation Encapsulant material applicator for semiconductor wafers and method of use thereof
US20060086268A1 (en) * 2002-07-23 2006-04-27 Steenkamer Arnoldus T Squeegee unit for a rotary screen-printing device
US7331285B2 (en) * 2002-07-23 2008-02-19 Stork Prints B.V. Squeegee unit for a rotary screen-printing device
US20070144377A1 (en) * 2004-08-21 2007-06-28 Christoph Henninger Doctor device
US8082875B2 (en) * 2004-08-21 2011-12-27 Voith Patent Gmbh Doctor device

Also Published As

Publication number Publication date
IT1002470B (it) 1976-05-20
ATA974A (de) 1975-04-15
FR2212238A1 (enrdf_load_html_response) 1974-07-26
AT327145B (de) 1976-01-12
JPS506416A (enrdf_load_html_response) 1975-01-23
NL7317687A (enrdf_load_html_response) 1974-07-04
FR2212238B1 (enrdf_load_html_response) 1976-05-14
CH572810A5 (enrdf_load_html_response) 1976-02-27
DE2365099A1 (de) 1974-07-04

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