EP2776248B1 - Siebdruckrakel und vorrichtung zum siebdrucken - Google Patents

Siebdruckrakel und vorrichtung zum siebdrucken Download PDF

Info

Publication number
EP2776248B1
EP2776248B1 EP12783973.6A EP12783973A EP2776248B1 EP 2776248 B1 EP2776248 B1 EP 2776248B1 EP 12783973 A EP12783973 A EP 12783973A EP 2776248 B1 EP2776248 B1 EP 2776248B1
Authority
EP
European Patent Office
Prior art keywords
printing
screen
spring
squeegee
leaf
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.)
Not-in-force
Application number
EP12783973.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2776248A2 (de
Inventor
Harry Götz
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.)
Thieme GmbH and Co KG
Original Assignee
Thieme GmbH and Co KG
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 Thieme GmbH and Co KG filed Critical Thieme GmbH and Co KG
Priority to PL12783973T priority Critical patent/PL2776248T3/pl
Publication of EP2776248A2 publication Critical patent/EP2776248A2/de
Application granted granted Critical
Publication of EP2776248B1 publication Critical patent/EP2776248B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B41F15/46—Squeegees or doctors with two or more operative parts
    • 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
    • B41P2215/50—Screen printing machines for particular purposes

Definitions

  • the invention relates to a screen printing squeegee with an elastic applicator element and a holding device for the applicator element, wherein the holding device is divided over the width of the applicator element into a plurality of mutually movable holding sections.
  • the invention also relates to a device for screen printing with a screen printing squeegee according to the invention.
  • WO 2005/035250 A1 is a screen printing squeegee with an elastic applicator element in the form of a plate-shaped squeegee rubber known.
  • the plate-shaped squeegee rubber is provided with a holding device, wherein the holding device pressure cylinder attack, which are also connected to a doctor carrier.
  • the elastic applicator element is pressed by means of the printing cylinder in the direction of a printing screen and a printing table and then moved by means of a movement of the doctor carrier parallel to the printing table on this or the printing material.
  • the division of the holding device into a plurality of mutually movable holding sections intended to achieve a certain flexibility of the screen printing squeegee.
  • the squeegee rubber itself is cut according to the contour of the object to be printed.
  • a squeegee blade which is connected by means of a plurality of arcuately constructed and arranged in total pyramid-shaped brackets with a squeegee bar.
  • the squeegee itself is connected by means of a plurality of retaining clips and a base member with the pyramidal arrangement of the brackets.
  • the pyramidal arrangement of the brackets allows flexibility of the squeegee rubber in the plane of the squeegee rubber itself.
  • the individual arcuate brackets can exert a spring action in the direction of the print material.
  • a squeegee blade with an elastic applicator element and a holding device for the applicator element is known, wherein the holding device over the width of the applicator element is divided into a plurality of mutually movable holding sections.
  • the individual holding sections overlap like scales.
  • Each of the holding sections is connected to a printing cylinder.
  • the holding sections are each U-shaped and overlap an upper edge of the applicator element.
  • Within the U-shaped holding portions a plurality of stacked continuous leaf spring elements are received, which are not connected to the individual holding portions.
  • the impression cylinders are pivotably mounted by means of rollers in the respective holding sections about a pivot axis extending perpendicular to the printing direction.
  • the invention provides an improved screen-printing squeegee and an improved screen-printing device for printing curved surfaces can be used in a flexible manner.
  • a screen-printing squeegee with the features of claim 1 is provided for this purpose.
  • the screen printing squeegee is provided with an elastic applicator element and a holding device for the applicator element, wherein the holding device is divided over the width of the applicator element into a plurality of mutually movable holding sections.
  • a leaf spring element is provided which connects the mutually movable holding sections with each other.
  • the screen-printing squeegee is substantially stiffer, since the leaf-spring element only permits a very limited movement of the individual holding sections relative to one another in this direction. In and against the printing direction, the screen printing squeegee is thus very stiff, so that a precise pressure is made possible.
  • the screen printing squeegee according to the invention is also suitable for printing three-dimensionally curved surfaces, for example pan-shaped glass panes for motor vehicles.
  • the leaf spring element is formed and arranged so that a spring travel of the individual holding sections parallel to the plane of the applicator element, that is perpendicular to the intended printing direction, is made possible and movement of the holding sections to each other in and against the printing direction is largely prevented.
  • the spring action of the leaf spring element at the same time ensures that an excessive movement of the holding sections is prevented from each other and always a continuous, uniform course of decisive for the printing process lower edge of the doctor element is guaranteed.
  • the leaf spring element has a continuous leaf spring which extends over at least the length of the doctor blade and from which fastening flanges extend to the individual holding sections.
  • a continuous leaf spring which has only one spring leaf in the illustrated embodiment
  • the desired spring action parallel to the plane of the applicator element, ie perpendicular to the printing direction, and on the other the desired stiffening of the doctor perpendicular to the applicator element level, ie in and against the printing direction can be achieved.
  • the provision of mounting flanges allows the unproblematic arrangement of the leaf spring on the holding device or the individual holding sections.
  • a leaf spring element provided with retaining flanges. In this way, the leaf spring elements themselves can be made smaller and lighter be achieved because the spring action and the stiffening of the doctor blade by means of the two arranged in front of and behind the application element leaf spring elements.
  • the leaf spring is formed from sheet material and has a width which is greater than a thickness of the leaf spring and wherein the leaf spring is oriented so that the width dimension is arranged parallel to the printing direction and the thickness dimension perpendicular to the printing direction and the printing table.
  • the mounting flanges are formed integrally with the web.
  • the leaf spring element is designed as a sheet metal part and the mounting flanges are bent starting from the web.
  • the leaf spring element can be formed in a simple manner from spring steel and lasered, for example.
  • the leaf spring consists only of a spring leaf.
  • a device for screen printing with a screen printing squeegee in which several, in particular each of the holding sections of Siebdruckrakel a printing cylinder is assigned, wherein the pressure cylinder movable on the one hand with the holding sections and on the other hand with a in and against the printing direction Doctor blade beams are connected, wherein the pressure cylinder acting pressure for at least some of the pressure cylinder is separately adjustable.
  • the printing cylinders are fastened on the one hand to a respective holding section and on the other hand to a doctor bar, wherein the printing cylinders are arranged pivotably on the doctor bar and / or on the holding sections about a pivot axis arranged substantially parallel to the printing direction.
  • the pressure cylinders can be adjusted so that a force exerted by the printing cylinders on the applicator element substantially always acts perpendicular to the surface to be printed.
  • the pivoting of the impression cylinder can be done during a setting operation, and the impression cylinder can be determined after the adjustment process with respect to the pivot axes.
  • the printing cylinders can also pivot about the pivot axes during the printing process, for example when viewed in the printing direction, the curvature of the object to be printed changes.
  • a pivot axis is arranged approximately at half the height of the doctor blade beam.
  • the pivot axis is located directly above or in the region of the upper edge of the application element.
  • the presentation of the Fig. 1 shows a screen printing blade 10 having an elastic applicator element 12 and a holding device 14 for the applicator element 12.
  • the applicator element 12 is in the form of an elastic and rectangular cross-section material strip.
  • the holding device 14 has a plurality of clip-like holding sections 16, wherein over the width of the applicator element 12 seen a total of nineteen holding portions 16 are provided.
  • a printing direction is indicated by an arrow 18.
  • the applicator element 12 is thus moved in the printing direction 18 over a printing screen and thereby presses on the printing screen located color through openings in the printing screen on a pressure medium arranged below the printing screen, for example, a curved vehicle window.
  • the width of the applicator element 12 is perpendicular to the printing direction 18 and parallel to a printing table, not shown, the length of the applicator element 12 parallel to the printing direction 18.
  • the applicator element 12 thus has a width which is substantially greater than its length.
  • the holding portions 16 are each formed like a clip and engage over an upper edge of the elastic applicator element 12. However, the individual holding portions 16 are formed as separate from each other retaining clips, so that the individual holding portions 16 are movable relative to each other.
  • the holding sections 16 are connected both on a front side of the screen-printing squeegee 10 and on a rear side of the screen-printing squeegee 10, each with a leaf-spring element 20, 22.
  • the leaf spring elements 20, 22 are connected to the retaining clips of the holding portions 16 above the applicator element 12.
  • the two leaf spring elements 20, 21 are each integrally formed as a sheet metal bent part and each have a leaf spring 24, 26 and a plurality of bent from the leaf spring 24 mounting flanges 28, 30.
  • Each of the holding portions 16 is associated with a respective mounting flange 28, 30 and the mounting flanges 28 are each secured by means of two bolts 32 to the retaining portions 16 formed as retaining clips.
  • a width of the leaf spring 24 is greater than a thickness of the leaf spring 24.
  • the thickness direction is perpendicular to the printing direction 18 and a printing table, not shown, the width direction parallel to the printing direction 18.
  • the leaf spring 24 is thus in the form of a single spring leaf formed and allows a spring movement substantially only perpendicular to the printing direction 18 and perpendicular to a printing table, not shown, in Fig. 1 ie in the thickness direction of the spring leaf and thus from bottom to top and vice versa.
  • the leaf spring is much stiffer due to their width significantly greater than the thickness and thus largely prevents movement of the individual holding portions 16 in and against the printing direction 18.
  • the width of the leaf spring 24 is about five to ten times greater than that Thickness of the leaf spring 24, wherein the ratio of width to thickness and the spring stiffness of the leaf spring can be adapted to the intended application.
  • a plurality of spring leaves may be provided which have different lengths to achieve the desired spring action.
  • the individual holding sections 16 can thus be perpendicular to the printing direction 18 and perpendicular to the printing table move relative to each other and in this way the elastic applicator element 12 can be deformed so that its pressure edge 34 is curved and can be adapted in this way to the contour of an object to be printed. Nevertheless, a deflection of the applicator element 12 and especially the pressure edge 34 in and against the pressure direction 18 is largely avoided, since in and against the pressure direction 18, a movement of the individual holding portions 16 with each other by the two leaf springs 24, 26 is largely prevented.
  • the screen printing squeegee according to the invention is thus very flexible perpendicular to the printing direction 18 and perpendicular to the printing table and can adapt to curvatures of one object to be printed.
  • the screen-printing squeegee 10 is very stiff and thus enables a very precise printing process.
  • Fig. 2 In the presentation of the Fig. 2 is an enlarged view of a portion of the squeegee blade 10 can be seen. Shown are only two of the holding portions 16 completely and two further holding portions 16 partially. As already on the basis of Fig. 1 has been explained, the holding portions 16 are each formed as retaining clips and engage around the upper edge of the elastic applicator element 12. The legs of these retaining clips are movable towards each other for a clamping operation to clamp the elastic applicator element 12 safely.
  • the leaf spring element 20 has the leaf spring 24, from which the mounting flanges 28 extend.
  • the mounting flanges 28 are then respectively secured to the legs of the retaining clips of the retaining portions 16, wherein the attachment of the mounting flanges 28 by means of the bolts 32 on the holding portions 16 above an upper edge of the elastic applicator element 12.
  • the leaf spring 24, however, is about halfway up the applicator element 12 and about arranged at the height of the free end of the legs of the retaining clips of the holding portions 16.
  • the holding portions 16 are profiled at their upper end facing away from the applicator element 12 in the form of retaining grooves, so that they can be clamped in clamping jaws 56 of a doctor blade holder, see Fig. 4 ,
  • the presentation of the Fig. 3 shows a screen printing device 40 according to the invention with a Siebdruckrakel 10 according to the invention from the front, ie opposite to the direction of pressure 18 in Fig. 1 ,
  • the leaf spring element of the squeegee blade 10 is formed slightly differently than in the embodiment of Fig. 1 , the representation of Fig. 3 but essentially serves to illustrate the structure of the screen printing device 40 according to the invention.
  • Each of the holding portions 16 is assigned a respective printing cylinder 42, 48.
  • the pressure cylinders 42, 48 are arranged on the one hand on the holding portions 16 and on the other hand on receiving elements 44, wherein the receiving elements 44 are arranged displaceably on a doctor bar 46.
  • the pressure cylinder 42 are partially deflected from its vertical position to the doctor bar 46.
  • the impression cylinders 42 with the exception of the two central impression cylinders 48, are pivotable about a respective pivot axis 52, 54 both relative to the application element 12 on the doctor blade 46 and relative to the holding sections 16.
  • the pivot axes 52, 54 are all parallel to the printing direction 18, in Fig. 3 ie perpendicular to the drawing plane.
  • a force can be introduced by means of the pressure cylinder 42 thereby over the entire width of the screen printing blade 10 approximately perpendicular to the pressure edge 34 take place, which rests during a printing operation on a printing screen, not shown, which in turn rests on a printing material, not shown, to be printed, which in turn is located on a printing table 50.
  • the pressure introduction is not exactly perpendicular to the pressure edge 34.
  • the position of the pivot axis 52 is further displaced in the direction of the pressure edge 34.
  • the pivot axis 52 with which the pressure cylinders 42 are arranged pivotably on the holding portions 16, in the region of the upper edge of the elastic applicator element 12 or even below the upper edge of the applicator element 12 is arranged.
  • the doctor angle can be adjusted, ie an angle between the applicator element 12 and the surface to be printed. This is realized by a curved link guide on the doctor blade receptacle between the pivot axis 52 and the clamping jaws 56.
  • the presentation of the Fig. 4 shows one of the printing cylinder 42, the screen printing blade 10 in Fig. 4 not shown. It can be seen that a pivot axis 52, about which the pressure cylinder 42 is pivotable relative to the receiving element 44, is arranged at half the height of the doctor beam 46.
  • the receiving element 44 is provided with two clamping screws and can be moved along the doctor blade 46. The movement about the pivot axis 54 and about the pivot axis 52 can be blocked, so that the pressure cylinders 42 are pivoted about the pivot axes 52, 54 in a setting and then blocked.
  • the pivoting of the impression cylinder 42 about the pivot axes 52, 54 may also be enabled during a printing operation to allow adaptation of the screen printing blade 10 to changing curvatures of the article 50 to be printed.
  • the object to be printed 50 is a trough-like car window whose curvature changes perpendicular to the printing direction and also in and against the printing direction over length.
  • the Siebdruckrakel 10 is thereby mounted in a simple manner and dismountable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
EP12783973.6A 2011-11-07 2012-11-05 Siebdruckrakel und vorrichtung zum siebdrucken Not-in-force EP2776248B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12783973T PL2776248T3 (pl) 2011-11-07 2012-11-05 Rakiel do sitodruku i urządzenie do sitodruku

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202011107661U DE202011107661U1 (de) 2011-11-07 2011-11-07 Siebdruckrakel und Vorrichtung zum Siebdrucken
PCT/EP2012/071849 WO2013068317A2 (de) 2011-11-07 2012-11-05 Siebdruckrakel und vorrichtung zum siebdrucken

Publications (2)

Publication Number Publication Date
EP2776248A2 EP2776248A2 (de) 2014-09-17
EP2776248B1 true EP2776248B1 (de) 2017-01-04

Family

ID=47148788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12783973.6A Not-in-force EP2776248B1 (de) 2011-11-07 2012-11-05 Siebdruckrakel und vorrichtung zum siebdrucken

Country Status (6)

Country Link
US (1) US8985015B2 (hu)
EP (1) EP2776248B1 (hu)
DE (1) DE202011107661U1 (hu)
HU (1) HUE031384T2 (hu)
PL (1) PL2776248T3 (hu)
WO (1) WO2013068317A2 (hu)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107073927A (zh) * 2014-08-01 2017-08-18 康宁股份有限公司 丝网印刷装置和方法
CN107073926A (zh) * 2014-08-01 2017-08-18 康宁股份有限公司 丝网印刷设备和方法
DE102015212515A1 (de) 2015-07-03 2017-01-05 Thieme Gmbh & Co. Kg Siebdruckvorrichtung und Verfahren zum Siebdrucken
US11148410B2 (en) * 2016-08-23 2021-10-19 Clarion Technologies, Inc. Apparatus and method for printing on curved surfaces
DE102018003919A1 (de) * 2018-05-16 2019-11-21 Giesecke+Devrient Currency Technology Gmbh Rakel für eine Siebdruckmaschine
WO2020031072A1 (en) * 2018-08-06 2020-02-13 Entrust Datacard Corporation Drop-on-demand ink delivery systems and methods in card processing systems

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667253A (en) * 1949-01-08 1952-02-27 Trico Products Corp Improvements in or relating to windscreen wipers
DE1819026U (de) * 1960-01-30 1960-10-06 Andreas Peschl Verstellbare und federnde rakel fuer siebdruckmaschinen im rund- und flachdruck.
DE3227626A1 (de) * 1982-07-23 1984-01-26 Rebhan, Horst, 8647 Stockheim Rakelkopf zum bedrucken von koerpern im siebdruckverfahren
IT1269581B (it) * 1994-04-22 1997-04-08 Tosh Srl Dispositivo raclatore per macchine da stampa
JP3677150B2 (ja) * 1998-05-18 2005-07-27 ニューロング精密工業株式会社 曲面スクリーン印刷装置
US6834582B2 (en) * 2001-06-21 2004-12-28 Exatec, Llc Apparatus for printing on a curved substrate
DE10362093B4 (de) 2003-09-16 2009-02-19 Thieme Gmbh & Co. Kg Vorrichtung zum Siebdrucken und Siebdruckverfahren zum Bedrucken gekrümmter Oberflächen
DE10344023B4 (de) 2003-09-16 2006-06-14 Thieme Gmbh & Co. Kg Siebdruckrakel und Vorrichtung zum Siebdrucken
US7182019B2 (en) * 2004-01-23 2007-02-27 Exatec, Llc Screen printing apparatus
US20080202364A1 (en) * 2007-02-28 2008-08-28 Glen Shawn Mallory Means of attaining large screen print area with new squeegee design

Also Published As

Publication number Publication date
PL2776248T3 (pl) 2017-07-31
WO2013068317A3 (de) 2013-07-18
WO2013068317A2 (de) 2013-05-16
DE202011107661U1 (de) 2013-02-08
HUE031384T2 (hu) 2017-07-28
US8985015B2 (en) 2015-03-24
EP2776248A2 (de) 2014-09-17
US20130139710A1 (en) 2013-06-06

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