US3795188A - Fluid pressure biased squeegee blade and counter pressure table therefor - Google Patents

Fluid pressure biased squeegee blade and counter pressure table therefor Download PDF

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Publication number
US3795188A
US3795188A US00232593A US3795188DA US3795188A US 3795188 A US3795188 A US 3795188A US 00232593 A US00232593 A US 00232593A US 3795188D A US3795188D A US 3795188DA US 3795188 A US3795188 A US 3795188A
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US
United States
Prior art keywords
screen
counterpressure
belt
membrane
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
US00232593A
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English (en)
Inventor
A Giani
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.)
Reggiani SpA
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Reggiani SpA
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Publication date
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Publication of US3795188A publication Critical patent/US3795188A/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/28—Supports for workpieces for elongated flat articles, e.g. strips, bands

Definitions

  • the invention relates to a device for distributing the dye and to a so-called counterpressure table.
  • one of the most commonly used types of machines for the printing of fabrics in particular, and of ribbon-like materials in general, comprises substantially an endless carrying belt which carries the ribbon to be printed; cylindrical rotary screens revolving in concert with the endless carrying belt; devices for the feeding of the dyes to the surface of the cylindrical screens; devices for the distribution of the dye (commonly called squeegees); and counterpressure surfaces arranged underneath the endless carrying belt and opposed to the screens.
  • One object of this invention is that of providing -a printing apparatus for cylindrical screen printing machines that will ensure uniform pressures between the various moving parts, that is composed of durable or relatively non-wearable devices or of devices only subject to local wear in parts easily and cheaply'replaceable, and that shall enable one to obtain high quality printing.
  • a printing apparatus for printing machines with cylindrical screens and an endless carrying belt
  • apparatus comprises, according to the invention, a squeegeeing device consisting of an elastic membrane, expansible by means of a pressurized fluid, the membrane being associated with an equalizing bar arranged between the same membrane and a blade of flexible and elastic material acting on the internal surface of the cylindrical screen with an acute incidence angle, and there being opposed to said squeegeeing device a counterpressure table inclined, with respect to said endless carrying belt, preferably at an angle between 3 and 6,
  • said counterpressure table being provided with an at 7 least double lining formed of layers of soft and yielding material, preferably felt and/or foam-rubber, and with an anti-frictional thin plate having one of its ends constrained with respect to the counterpressure table and the opposite end free and in contact with the endless carrying belt, said contact occurring downstream of the point of contact between the endless carrying belt and the screen,
  • 1 indicates part of a perforated cylindrical screen of an otherwise conventional machine for printing fabrics or ribbon-like materials in general.
  • the material to be printed is attached to and carried by the endless carrying belt 2 and is thus mobile with the same. As shown by the arrow A, the endless carrying belt 2 moves in a direction toward the left in the drawing.
  • a dye collector or reservoir 3 which forms one single body with the squeegee-holder 4.
  • the squeegee consists of a membrane or hollow body 5 parallel to the axis of the screen 1, a cylindrical bar 6, and blade 7.
  • Membrane 5 is fed with a pressurized fluid through pipe 8 and pressure regulator 9. Upon increase of the pressure of the fluid, the membrane 5 swells out pushing downwardly the bar 6 which, together with the membrane, is arranged in a channel-like seat opening downwardly, and formed by the lower end of the squeegee-holder 4.
  • Bar 6 acts on blade 7 with a force which is proportional to the pressure of the fluid contained within the membrane 5.
  • the blade 7 is made of bronze or steel, or any other suitable flexible and elastic material in general. It is attached to the squeegee-holder 4, by a curved plate 10 and screws Ill. The other end of blade 7 is in contact with the internal surface of the screen 1 at an incidence angle which is acute.
  • the quantity of dye 12 (coming from the collector or reservoir 3 in a way not shown in the drawing -for the sake of simplicity) that, passing through screen 1, is deposited on the ribbon to be printed, depends on the angle of incidence between the blade 7 and a counterpressure-table l3.
  • said angle of incidence may be adjusted at will by varying the pressure of the fluid contained within the membrane 5.
  • the angle of incidence is constant throughout the various cross-sectional planes of the screen 1, thus insuring a uniform printing.
  • the counterpressure table 13 consists of a flat surface, inclined with respect to the endless carrying belt 2, curving over lateral supports 14 and 15 fixed in turn to beam 16.
  • the counterpressure table 13 is covered by a double layer of felt, fixed to the lateral supports 14 and15 by means of angle irons l8 and 19.
  • An anti-friction plate 20 conventionally made of bronze, bronze alloys or stainless steel forms the surface of the counterpressure table 113 which supports the moving belt 2. As shown in the drawing, one end of the plate 20 is fixed between the felt layer 17 and the angle iron 19. The middle portion of the plate 20 rests on the felt layer 17 and the other, free, end of the plate (opposite the fixed end) overhangs the counterpressure table 13 adjacent thelateral support 14!, in cantilever fashion.
  • the plate 20 is made of a friction-reducing material to allow the belt 2 to slide freely over the overhanging portion of the plate on which the belt is supported.
  • the contact zone between the anti-friction thin plate 20 and the endless carrying belt 2 is staggered with respect to the zone of contact between the screen 1 and the same endless carrying belt 2. More particularly, the former 3 is downstream of the latter (with respect to the direction of advancement of the endless carrying belt 2).
  • the penetration of the dye depends on the contact time between the screen 1 and the material to be printed.
  • Increasing the pressure of the fluid contained within the membrane increases the arc of contact between the screen 1 and the carrying belt 2 and, consequently, both the contact time as well as the penetration of the dye increase.
  • the lining of the counterpressure table 13 may be completed if desired by a layer of foam-rubber placed underneath the felt layer 17.
  • This lining and the thin plate insure in any case a smooth and jerkless sliding, with little friction and wear, of the endless carrying belt 2, with consequent precise printing of the fabric or ribbon-like materials carried thereon.
  • Apparatus for use with cylindrical screen printing machines comprising:
  • a movable belt for carrying a ribbon of material to be printed
  • a rotatable cylindrical screen mounted for rotation in contact with said ribbon on said movable belt;
  • a squeegee holder member mounted inside said screen and having a channel-like seat opening downwardly from one portion of'said holder and extending parallel to the rotational axis of said screen;
  • fluid pressure means coupled to said membrane to pressurize and expand said membrane in a controllable manner
  • a blade of flexible material mounted for contact with the interior surface of said screen and formingan acute angle of incidence with said movable belt;
  • a counterpressure table disposed adjacent the opposite surface of said belt from said screen, said table having a surface portion in the region opposite said screen inclined with respect to said belt and including a lining of yieldable material covering at least a portion of the surface of said table, and a plate having one end portion fixedly mounted to said table and an opposite end portion overhanging said table and spaced therefrom, said movable belt being supported at least by said overhanging end portion of saidplate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
US00232593A 1971-03-12 1972-03-07 Fluid pressure biased squeegee blade and counter pressure table therefor Expired - Lifetime US3795188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2167771 1971-03-12

Publications (1)

Publication Number Publication Date
US3795188A true US3795188A (en) 1974-03-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00232593A Expired - Lifetime US3795188A (en) 1971-03-12 1972-03-07 Fluid pressure biased squeegee blade and counter pressure table therefor

Country Status (9)

Country Link
US (1) US3795188A (de)
CA (1) CA942122A (de)
CH (1) CH541427A (de)
DE (1) DE2211052A1 (de)
ES (1) ES400684A1 (de)
FR (1) FR2129459A5 (de)
GB (1) GB1353120A (de)
NL (1) NL172632C (de)
SE (1) SE379682B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878780A (en) * 1973-01-02 1975-04-22 Alsacienne Constr Meca Resiliently supported air bladder for biasing squeegees
US3930445A (en) * 1974-03-14 1976-01-06 Precision Screen Machines, Inc. Squeegee assembly for use on a screen printing machine
US3952650A (en) * 1973-09-21 1976-04-27 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor-blade holder with cleaning means
US3958507A (en) * 1973-06-20 1976-05-25 Mitter & Co. Counter-pressure beam for use in screen printing machines and stiffening means therefor
US3998157A (en) * 1973-06-20 1976-12-21 Mitter & Co. Pivotal squeegee mount with fluid bias
US4038919A (en) * 1975-02-25 1977-08-02 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor blade holders for screen process printing machines
US4069756A (en) * 1973-04-05 1978-01-24 Stork Amsterdam B.V. Squeegee device
US4138943A (en) * 1973-06-20 1979-02-13 Mitter & Co. Reinforced hose means for biasing a squeegee
EP0011314A1 (de) * 1978-11-14 1980-05-28 Stork Brabant B.V. Rakel für Filmdruckmaschinen
US4232601A (en) * 1976-07-20 1980-11-11 Mitter & Co. Squeegee arrangement
US4696228A (en) * 1984-09-11 1987-09-29 Bernard David Screen process printing machine
US6149726A (en) * 1997-09-02 2000-11-21 Voith Sulzer Papiermaschinen Gmbh Floating doctoring apparatus
US11011877B2 (en) 2015-03-05 2021-05-18 Vernon R. Sandel Tamper resistant power receptacle

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT357505B (de) * 1972-12-21 1980-07-10 Zimmer Peter Ag Mehrteilige spaltrakel fuer filmdruckmaschinen
DE2655421C2 (de) * 1976-12-07 1986-04-17 Elmar Dr. 8000 München Messerschmitt Verfahren zur Messung des Rakeldrucks im Siebdruck
DE8102099U1 (de) * 1980-01-31 1981-07-02 Zimmer, Johannes, 9020 Klagenfurt, Kärnten Einrichtung an maschinen zum bedrucken, beschichten, faerben von flaechenfoermigem material
DE29601855U1 (de) * 1996-02-03 1997-06-05 Bosch Gmbh Robert Rakel für den Siebdruck von elektrischen Elementen und Strukturen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566358A (en) * 1924-09-05 1925-12-22 Vickerys 1920 Ltd Doctor for paper machines
US2292602A (en) * 1940-04-16 1942-08-11 Joseph P Biondi Printing device
US2423391A (en) * 1945-02-21 1947-07-01 John B Kozloff Screen printing table
US2424949A (en) * 1943-11-08 1947-07-29 T & T Vicars Ltd Coating of articles
US2698574A (en) * 1951-07-11 1955-01-04 Visking Corp Apparatus for bonding nonwoven webs
US3029779A (en) * 1958-10-15 1962-04-17 Beloit Iron Works Reverse bar coater
US3110919A (en) * 1961-04-12 1963-11-19 Owens Illinois Glass Co Fluid spreader
US3116688A (en) * 1959-12-23 1964-01-07 Koppers Co Inc Ink fountain
FR2006887A1 (de) * 1968-04-25 1970-01-02 Stork Amsterdam
US3587458A (en) * 1967-09-26 1971-06-28 Buser Ag Maschf Fritz Rolling contact screen printing machine with deformable counterpressure member
US3735730A (en) * 1969-12-22 1973-05-29 Mitter & Co Apparatus for applying a flowable medium to a carrier

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566358A (en) * 1924-09-05 1925-12-22 Vickerys 1920 Ltd Doctor for paper machines
US2292602A (en) * 1940-04-16 1942-08-11 Joseph P Biondi Printing device
US2424949A (en) * 1943-11-08 1947-07-29 T & T Vicars Ltd Coating of articles
US2423391A (en) * 1945-02-21 1947-07-01 John B Kozloff Screen printing table
US2698574A (en) * 1951-07-11 1955-01-04 Visking Corp Apparatus for bonding nonwoven webs
US3029779A (en) * 1958-10-15 1962-04-17 Beloit Iron Works Reverse bar coater
US3116688A (en) * 1959-12-23 1964-01-07 Koppers Co Inc Ink fountain
US3110919A (en) * 1961-04-12 1963-11-19 Owens Illinois Glass Co Fluid spreader
US3587458A (en) * 1967-09-26 1971-06-28 Buser Ag Maschf Fritz Rolling contact screen printing machine with deformable counterpressure member
FR2006887A1 (de) * 1968-04-25 1970-01-02 Stork Amsterdam
US3735730A (en) * 1969-12-22 1973-05-29 Mitter & Co Apparatus for applying a flowable medium to a carrier

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878780A (en) * 1973-01-02 1975-04-22 Alsacienne Constr Meca Resiliently supported air bladder for biasing squeegees
US4069756A (en) * 1973-04-05 1978-01-24 Stork Amsterdam B.V. Squeegee device
US3958507A (en) * 1973-06-20 1976-05-25 Mitter & Co. Counter-pressure beam for use in screen printing machines and stiffening means therefor
US3998157A (en) * 1973-06-20 1976-12-21 Mitter & Co. Pivotal squeegee mount with fluid bias
US4138943A (en) * 1973-06-20 1979-02-13 Mitter & Co. Reinforced hose means for biasing a squeegee
US3952650A (en) * 1973-09-21 1976-04-27 Societe Alsacienne De Constructions Mecaniques De Mulhouse Doctor-blade holder with cleaning means
US3930445A (en) * 1974-03-14 1976-01-06 Precision Screen Machines, Inc. Squeegee assembly for use on a screen printing machine
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 (de) * 1978-11-14 1980-05-28 Stork Brabant B.V. Rakel für Filmdruckmaschinen
US4299164A (en) * 1978-11-14 1981-11-10 Stork Brabant B.V. Squeegee for screen printing machine
US4696228A (en) * 1984-09-11 1987-09-29 Bernard David Screen process printing machine
US6149726A (en) * 1997-09-02 2000-11-21 Voith Sulzer Papiermaschinen Gmbh Floating doctoring apparatus
US11011877B2 (en) 2015-03-05 2021-05-18 Vernon R. Sandel Tamper resistant power receptacle

Also Published As

Publication number Publication date
NL172632B (nl) 1983-05-02
DE2211052A1 (de) 1972-09-21
GB1353120A (en) 1974-05-15
CH541427A (de) 1973-09-15
FR2129459A5 (de) 1972-10-27
SE379682B (de) 1975-10-20
ES400684A1 (es) 1975-01-16
NL172632C (nl) 1983-10-03
NL7202927A (de) 1972-09-14
CA942122A (en) 1974-02-19

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