EP1058622A1 - Ameliorations apportees a des tetes d'impression - Google Patents

Ameliorations apportees a des tetes d'impression

Info

Publication number
EP1058622A1
EP1058622A1 EP99905051A EP99905051A EP1058622A1 EP 1058622 A1 EP1058622 A1 EP 1058622A1 EP 99905051 A EP99905051 A EP 99905051A EP 99905051 A EP99905051 A EP 99905051A EP 1058622 A1 EP1058622 A1 EP 1058622A1
Authority
EP
European Patent Office
Prior art keywords
print head
blade
wiper blade
printing
screen
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.)
Granted
Application number
EP99905051A
Other languages
German (de)
English (en)
Other versions
EP1058622B1 (fr
Inventor
Francis Bourrieres
Clément KAISER
Neil Macmillan Macraild
Andrew Charles Ricketts
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.)
ASM Assembly Systems Switzerland GmbH
Original Assignee
DEK Printing Machine Ltd
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 DEK Printing Machine Ltd filed Critical DEK Printing Machine Ltd
Publication of EP1058622A1 publication Critical patent/EP1058622A1/fr
Application granted granted Critical
Publication of EP1058622B1 publication Critical patent/EP1058622B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising 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
    • B41F15/40—Inking units
    • 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
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2215/00—Screen printing machines
    • B41P2215/10—Screen printing machines characterised by their constructional features
    • B41P2215/13—Devices for increasing ink penetration
    • B41P2215/132—Devices for increasing ink penetration by increasing pressure above the screen

Definitions

  • the invention relates to print heads.
  • a first aspect relates to wiper blades (such as wiper blades used in screen printing), and a second aspect relates to print heads (such as print heads employed in screen printing).
  • screen printing machines used a squeegee blade which was dragged at an angle over a printing screen to press a substance to be printed through open apertures in the screen, a reservoir of the substance to be printed being drawn across the screen in the form of a bead maintained between the screen and the wiper blade.
  • At least one long flexible wiper is provided, the wiper extending transverse to the direction of displacement of the device over the stencil and transverse to the direction of displacement of the substance to be printed towards the screen, the wiper being inclined inwardly to extend across the open end of the chamber and arranged such that when the chamber is pushed against the screen and the product is pushed under pressure through the screen, the wiper acts to provide a scraping action for lifting paste off the screen and to provide a "rolling" action of the paste.
  • a wiper in the new form of printing has a leading angle. It has been proposed that such wipers be formed of polyester material such as those sold under the Trademark Mylar.
  • a wiper blade for screen printing comprising a web of synthetic material to be mounted adjacent one longitudinal edge thereof on a print head, extending towards a screen and having a leading angle during a printing operation, the wiper blade having, at the other longitudinal edge thereof, a metallic reinforcing member which also acts as a wear strip and contacts the screen during the printing operation.
  • the thickness of the metallic member is equal to or less than that of the synthetic wiper blade.
  • the width of the metallic member is equal to or less than that of the synthetic wiper blade.
  • the metallic member is of a thickness between 10 and 70% of the thickness of the synthetic wiper blade, preferably around 20% thereof, and is of a width of 10 to 40% of the width of the wiper blade, preferably around 23% thereof.
  • the metallic member can be flush with the free edge of the synthetic wiper blade (ie. zero projection), or can project from the free edge of the blade by up to 30% of its width.
  • the metallic reinforcement and wear strip is formed of stainless steel which increases the rigidity of the synthetic wiper blade while allowing the wiper blade still to flex and bend and increasing its resistance to wear. It can give greatly enhanced and consistent print quality from the printing operation.
  • the metallic member could be of spring steel, titanium or a variety of other materials known to persons skilled in the art.
  • the wiper blade was formed of polyester and a metal reinforcement strip of stainless steel, the wiper blade was of an overall length of 340 millimetres, had six slots in one edge thereof through which screws could project to mount the wiper blade on a print head, was 22 millimetres in width and 0.5 millimetres in thickness and the stainless steel blade was secured by adhesive to the opposite edge to said edge in which the slots were provided for mounting screws, had a length the same as that of the wiper blade, a width of 5 millimetres, a thickness of 0.1 millimetres and an overhang beyond the free edge of the wiper blade of 0.5 millimetres.
  • a further aspect of the invention seeks to further enhance the screen printing process described in the above-mentioned co-pending application.
  • the previously proposed process employs a chamber within which printing product is provided. As the chamber is used, product is dispensed and the quantity of product in the chamber is gradually reduced. When the chamber is exhausted, it must be replaced with a fresh chamber before the printing process can continue. The used chamber is then either returned to the manufacturer for replenishment, which is expensive, or thrown away, which is wasteful and potentially environmentally damaging. In either case, the printing process must be halted to allow the chamber to be changed.
  • the second aspect of the invention provides a print head for a screen printer, the print head comprising a body, a receptacle for printing product, and one or more charging apertures by means of which printing product may be injected into said receptacle; each of said apertures being associated with a respective sealing means to prevent printing product from being dispensed from a respective aperture during a printing operation.
  • This aspect of the invention allows the user of the chamber to inject printing product into the chamber to recharge it, and therefore avoids the expense and waste associated with previously proposed arrangements.
  • This arrangement can also enable printing product to replaced "on the fly” so that disruption of the printing process can be avoided.
  • Figures 1, 2 and 3 are views of a print head provided with wiper blades according to the invention comprising respectively a perspective view from the underside, one end and one side; an elevation from said one end; and a perspective view from the other end, above and the other side;
  • Figure 4 is a plan view of a wiper blade according to the invention.
  • Figure 5 is a sectional view on line V-V of Figure 4 to a greatly increased scale;
  • Figure 6 is an enlarged view of the lower part of Figure 5;
  • Figure 7 is a front elevational view of a print head
  • Figure 8 is a cross-sectional view along the line X-X of Figure 7.
  • Figure 9 is a cross-sectional view along the line A- A of Figure 7.
  • a print head 1 comprises a body 2 with an underneath chamber 4 to receive product to be printed, end sealing blocks 5 for the chamber 4 and wiper blades 6 provided one on each side of the chamber 4, each wiper blade 6 being clamped by means of a mounting bar 7 having apertures therein through which screws 8 project, the screws 8 also extending through slots in the edge of the respective wiper blade 6 and engaging in screw threaded apertures in the body 2.
  • the one of the wiper blades 6 which is effective during a printing operation is the blade which is at the trailing side of the chamber 4 having regard to the direction of movement of the print head 1, and that the wiper blade 6 is at a leading angle to the screen which in use is provided below the print head 1 but which is not shown in Figures 1 to 3.
  • the blade 6 which during a print operation is on the leading side of the head having regard to the direction of movement of the head acts only in a sealing sense.
  • the print head is pressed downwardly to force the blade against the screen. Pressure is also applied to the substance to be printed in the chamber 4 to force substance through the screen.
  • a print head of the kind shown in Figures 1 to 3 can be used to effect a printing operation in either of the two directions shown by the double-headed arrow 9 in Figure 2.
  • each wiper blade 6 is formed as a flat strip 10 of polyester 21.5 millimetres in width, 0.5 millimetres in thickness and 340 millimetres in length.
  • one edge 10a it has six slots 11 to receive the shanks of the screws 8.
  • the metallic strip 12 projects, as shown in Figure 6, by a portion 12a beyond the adjacent edge 10b of the polyester strip 10 by approximately 0.5 millimetres and, as shown in Figure 1, the metallic strip 12 is provided on the underside of the polyester strip 10 in its operative position such that it is the metallic strip 12 which contacts the screen during a printing operation and not the polyester strip 10.
  • the metallic strip 12 thus gives rigidity to the wiper blade 6 while still allowing the wiper blade 6 to flex and bend and also increases the wear resistance of the wiper blade 6 thereby to provide for consistent print quality in 5
  • Figure 7 shows a front elevational view of a print head 30 according to a second aspect of this invention.
  • the print head 30 is superficially similar to that described above with reference to Figures 1 to 6, and comprises a body 32 which is hollow and defines a printing product receptacle from which the printing product may be dispensed through a printing product orifice 34. Either side of the printing product orifice 34, there is provided a pair of wiper blades 36 (only one of which is visible) which are each secured to the body 32 by means of screws or other suitable means 38.
  • the body 32 comprises an upper section 35, a middle section 37 and a lower section 38 (although the body could alternative comprise a pair of removable sections, if desired).
  • Each of these sections are removably detachable from one another.
  • the sections 35, 37 and 38 together define the body 32 and the printing product receptacle.
  • the upper, middle and lower sections of the body are held together by screws which attach the upper section to the middle section, and by further screws 39 ( Figure 7) which attach the middle section to the lower section 38.
  • An o-ring seal 50 is provided between the middle and lower sections, and a diaphragm 52 is provided between the upper and middle sections.
  • the diaphragm 52 may be of rubber or any other suitable material and preferably has a top-hat- shaped cross-section.
  • the diaphragm 52 extends into the cavity defined by the upper section 35. Pressure is applied, in use, between the diaphragm and the walls of the upper section to drive the diaphragm, and hence the printing product, towards the orifice 34.
  • a rubber diaphragm is preferred as rubber has elastic properties which, when the pressure is removed, cause the diaphragm to attempt to move towards its initial position and therefore reduce the likelihood of printing product being dispensed from the orifice when it is not needed.
  • the printing product receptacle is defined by the inner walls of the diaphragm 52 housed in the upper section 35, the middle section and the lower section 38.
  • the body 32 includes one or more 6
  • sealing means 40 in a front wall thereof.
  • three sealing means 40 are provided in the front wall of the print head 30, but a larger or smaller number may be provided, and they need not necessarily be located in the front wall of the print head 30.
  • the sealing means each comprises a valve assembly such as a ball valve.
  • the sealing means could each comprise a cap for closing a channel to the interior of the printing product receptacle.
  • each valve assembly 40 comprises a channel 46 within which a ball 42 is movably retained.
  • pressure applied to the receptacle for printing product forces the ball 42 against a seat 46 thereby closing the passageway to the interior of the print head 30.
  • fresh printing product may be injected under pressure into the print head 30 by means of one or more of the valve assemblies 40 to move the ball 42 to open the passageway 46.
  • the print head 30 may remain in the printing apparatus or may be removed therefrom when the recharging of the print head 30 occurs. Alternatively, the print head may be connected to a supply of printing product to allow continuous replenishment of the printing product.
  • a simple cap or plug or bung could be provided.
  • the cap would, when in place, close the channel to the printing product receptacle and could be snap fittable with the channel, or could screw-threadably engage with the interior or exterior wall of the channel.
  • the plug or bung would be push-fittable into a friction fit with the walls of the channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)
  • Screen Printers (AREA)

Abstract

La présente invention concerne une raclette (6), destinée à la sérigraphie, qui comprend une bande en matériau synthétique fixée par une de ses extrémités longitudinales, de manière adjacente, à une tête d'impression. Durant l'impression, cette raclette est en contact avec un cadre et forme avec lui un angle en avant. La raclette (6) comprend sur son autre extrémité longitudinale un élément métallique (12) de renfort qui agit aussi comme segment d'usure et se trouve en contact avec le cadre durant l'impression. La présente invention concerne aussi une tête d'impression destinée à un dispositif de sérigraphie.
EP99905051A 1998-02-24 1999-02-16 Ameliorations apportees a des tetes d'impression Expired - Lifetime EP1058622B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9803873A GB2334479B (en) 1998-02-24 1998-02-24 Improvements relating to print heads
GB9803873 1998-02-24
PCT/GB1999/000466 WO1999043500A1 (fr) 1998-02-24 1999-02-16 Ameliorations apportees a des tetes d'impression

Publications (2)

Publication Number Publication Date
EP1058622A1 true EP1058622A1 (fr) 2000-12-13
EP1058622B1 EP1058622B1 (fr) 2003-07-02

Family

ID=10827504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99905051A Expired - Lifetime EP1058622B1 (fr) 1998-02-24 1999-02-16 Ameliorations apportees a des tetes d'impression

Country Status (6)

Country Link
EP (1) EP1058622B1 (fr)
JP (1) JP2002504445A (fr)
CA (1) CA2321785A1 (fr)
DE (1) DE69909253T2 (fr)
GB (2) GB2334479B (fr)
WO (1) WO1999043500A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9913496D0 (en) * 1999-06-10 1999-08-11 Williams David G Improved squeegee or sealing means/wiper
GB2351259A (en) 1999-06-22 2000-12-27 Dek Printing Machines Ltd Blades for screen printing
JP4080148B2 (ja) * 2000-07-11 2008-04-23 松下電器産業株式会社 スクリーン印刷装置およびスクリーン印刷装置用のペースト貯溜容器
KR101560646B1 (ko) * 2013-05-08 2015-10-15 이원복 요철형 가압유닛이 구비된 솔더 페이스트 공급장치
EP3973800A1 (fr) 2016-10-12 2022-03-30 Japan Tobacco Inc. Inhalateur d'arôme

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212920A1 (de) * 1972-03-17 1973-09-27 Artos Meier Windhorst Kg Vorrichtung zum gleichmaessigen auftragen von farbpasten bei rotationssiebdruckmaschinen
DE2250092C3 (de) * 1972-10-12 1980-11-20 Kuesters, Eduard, 4150 Krefeld Rakelvorrichtung
DE2302084B2 (de) * 1973-01-17 1975-01-16 Kuesters, Eduard, 4150 Krefeld Rakelvorrichtung für den Siebdruck
US4030410A (en) * 1973-02-14 1977-06-21 Peter Zimmer Dyestuff applicator for screen printer
CH576867A5 (fr) * 1975-02-24 1976-06-30 Buser Ag Maschf Fritz
DE4141124A1 (de) * 1991-12-13 1993-06-17 Messerschmitt Elmar Rakelstreifen fuer den siebdruck mit oberflaechenbehandlung
DE4239793A1 (fr) * 1992-01-03 1993-07-08 Noelle Gmbh
JPH0711338U (ja) * 1993-07-22 1995-02-21 南工学株式会社 スクリーン印刷機におけるスクィージー
FR2754474B1 (fr) 1996-10-15 1999-04-30 Novatec Dispositif pour le depot d'un produit visqueux ou pateux sur un substrat a travers les ouvertures d'un pochoir
DE29704025U1 (de) * 1997-03-06 1997-05-07 Voith Sulzer Papiermasch Gmbh Klinge für eine Auftragseinrichtung oder eine Rakelvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9943500A1 *

Also Published As

Publication number Publication date
GB9910940D0 (en) 1999-07-14
DE69909253D1 (de) 2003-08-07
WO1999043500A1 (fr) 1999-09-02
DE69909253T2 (de) 2004-05-27
GB2334481B (en) 2000-11-01
GB2334479A (en) 1999-08-25
EP1058622B1 (fr) 2003-07-02
GB2334481A (en) 1999-08-25
GB9803873D0 (en) 1998-04-22
CA2321785A1 (fr) 1999-09-02
JP2002504445A (ja) 2002-02-12
GB2334479B (en) 2000-07-19

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