EP2952347A1 - Rahmenstruktur zur unterstützung einer siebdruckplatte - Google Patents

Rahmenstruktur zur unterstützung einer siebdruckplatte Download PDF

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Publication number
EP2952347A1
EP2952347A1 EP15158737.5A EP15158737A EP2952347A1 EP 2952347 A1 EP2952347 A1 EP 2952347A1 EP 15158737 A EP15158737 A EP 15158737A EP 2952347 A1 EP2952347 A1 EP 2952347A1
Authority
EP
European Patent Office
Prior art keywords
frame structure
cornice
silkscreen
plate
silkscreen plate
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
EP15158737.5A
Other languages
English (en)
French (fr)
Other versions
EP2952347B1 (de
Inventor
Alberto Cazzaniga
Matteo Cerliani
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2952347A1 publication Critical patent/EP2952347A1/de
Application granted granted Critical
Publication of EP2952347B1 publication Critical patent/EP2952347B1/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
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/248—Mechanical details, e.g. fixation holes, reinforcement or guiding means; Perforation lines; Ink holding means; Visually or otherwise detectable marking means; Stencil units

Definitions

  • the present invention relates to a frame structure or cornice for supporting a silkscreen plate, of the type as recited in the preamble of the first claim.
  • silkscreen plates are thin sheets generally square or rectangular and made of, for example, metals or plastics, stainless steel, nickel silver, polyamide, nickel or other similar material.
  • These plates are suitable for machining using laser or water cutting, to create a matrix for positioning various substances, for example for electronic components. They are generally characterised by an extremely reduced thickness, less than a millimetre, generally between 80 ⁇ m and 300 ⁇ m.
  • silkscreen plates are placed in traction during use by tensioning members suitable to engage at least two opposite edges, and preferably all four edges of the plates.
  • the tensioning arms are part of the work stations using the silkscreen plates and comprise for example fluid dynamic cylinders and/or elastic means connected to cross-members fitted with specially designed teeth and substantially parallel to the edges of the plates.
  • Said teeth can be inserted in specially designed through openings generally made adjacent to the perimeter of the plates.
  • the through openings are holes having a circular, polygonal or other calculated cross-section suitable to permit an easy grip by the insertion teeth.
  • the through openings are placed at a suitable distance from the perimeter of the silkscreen plates, to avoid breakage during tensioning.
  • the through openings are preferably placed at a distance from the perimeter of the silkscreen plates between 0.5 cm and 3 cm.
  • the silkscreen plates need then to be handled with extreme care and attention.
  • the plates - given their minimal thickness - are extremely flexible and, when handled manually, are subject to extensive flexing and bending.
  • said frame defines gripping points for tensioning and thus makes the creation of said through openings unnecessary.
  • the frame prevents or reduces the flexing of the plates, prevents damage or bending thereof, protects operators by preventing contact with sharp edges or corners of the plates, and allows faster handling and screen printing.
  • the frame in question despite being widespread and available in various and different types, and while substantially resolving the problems mentioned above, has some drawbacks.
  • the first drawback is noticeable - in many cases - in the excessive thickness of said frame, which may create obstructions during work phases.
  • the thickness of the frame may extend both above and below the plate, thus making the positioning thereof more complex in the work phase and making the portions of the silkscreen plate near the edges less accessible.
  • each frame has its own specific characteristics of rigidity and deformability and therefore specifically influences the various operations of preparing and performing a silkscreen print.
  • the elements determining the stability and deformability of the frame are in many cases in full view and during the handling thereof may be damaged or incorrectly moved.
  • the technical purpose of the present invention is to devise a frame structure to support a silkscreen plate suitable to substantially overcome the drawbacks mentioned above.
  • a further purpose of the invention is to devise a simple frame structure of minimal cost and utilisable in a generalised manner in all situations and for all the specific needs of the silkscreen plates.
  • the frame according to the invention is globally denoted by reference numeral 1 while reference numeral 2 indicates the silkscreen plate surrounded by said frame.
  • the silkscreen plate 2 may be of the smooth type devoid of the gripping through openings at the edges, or possibly even provided with the traditional gripping openings if the same are at a distance of more than a centimetre from the perimeter of the plate as explained below.
  • the frame 1 is made of a metal, such as aluminium or a polymer material, such as PVC.
  • It comprises a plurality of single cornice elements 3, identical to each other in structure, width and height, and possibly diversified in pairs by length, the size of rectangular silkscreen plates 2.
  • Each cornice element 3 is defined by a single component or flattened strip having a length or main longitudinal extension direction.
  • the cornice element ends on both sides with ends or end faces 4 inclined to the main longitudinal extension direction.
  • the inclination is typically substantially 45° in the general case of a rectangular or square silkscreen plate 2.
  • cornice elements 3 can fit consecutively to each other at the ends 4, to define a continuous, uninterrupted, cornice surrounding the silkscreen plate 2.
  • each of the strips or flattened cornice elements 3 comprises two main faces 5 and 6, which can also be defined as the top face and a bottom face with a width or breadth-transversal to said main direction of extension and parallel to the silkscreen plate 2 - preferably substantially between 1.5 - 2.0 cm.
  • the two main faces 5 and 6 are preferably spaced from each other by about 0.4 - 0.7 centimetres, a dimension which corresponds to the maximum thickness of each flattened cornice element 3.
  • the first main face 5 is at least partially flat and is surmounted and engaged - when in use - by an edge 2a of the silkscreen plate 2, as indicated below.
  • the second main 6 face extends so as to contour or outline a relatively wide cavity 7 in practice defining a groove in the cornice element 3, said groove approaching the first main face 5 up to a distance to the order of a millimetre.
  • the cavity 7 is in addition tooth-shaped so that it can be engaged by tensioning means of the silkscreen plate 2.
  • each cornice element 3 at least one shaped channel 8 is then provided, extending at least partly inwards and longitudinally to each cornice element 3.
  • the shaped channel 8 is always provided at least at the ends 4 and preferably extends along the length of each cornice element 3, until it comes out in the ends 4.
  • the shaped channel 8 is flattened in a concordant manner with the cornice element 3 which it is inserted in and extends in width substantially parallel to the first main face 5. For example it has a thickness of little more than a millimetre and a width or breadth to the order of a centimetre or more.
  • the shaped channel 8 is adjacent and consecutive to the cavity 8 and expands from it so as to define undercuts 8a in each cornice element 3, as in the preferred embodiment shown.
  • the frame 1 comprises then connection members suitable to engage the cornice elements to each other when the same form a square around the silkscreen plate 2.
  • connection members are defined by retractable, embeddable brackets 9 slidingly interlocking between consecutive cornice elements 3, at the shaped channels 8 of the ends 4 facing each other.
  • the brackets 9 are made of a similar material to that of the cornice elements 3 and in any case in material which can be accurately machined or moulded.
  • brackets 9 determines the possibilities of deformation and tensioning of the frame 1 each time.
  • brackets 9 may be dimensioned so as to be insertable retractably and by forcing into shaped channels 8 facing each other, or may be slightly undersized so as to be slidably and not forcibly insertable into the shaped channels 8.
  • the brackets 9 inserted in them are forced if they have a thickness of about 1.25 cm and sliding if they have a thickness of about 1.15 cm.
  • brackets 9 stabilise the frame 1, preventing twisting and bending of the same.
  • brackets 9 are still embedded between consecutive cornice elements 3 and the cornice elements 3 are held in place by the silkscreen plate 2, to which they are engaged at the first main faces 5.
  • the first main face 5 is at least partially flat and is surmounted and engaged - when in use-by an edge 2a of the silkscreen plate 2.
  • the first main face 5 has a lowered portion 5a having preferably a breadth close to but less than a centimetre, a height the size of the thickness of the silkscreen plate 2, i.e. close to a millimetre.
  • the first main face 5 thus preferably has a flat, smooth extension.
  • the engagement means of the silkscreen plate 2 to the cornice element 3 may be chosen, for example, between thermal welding and ultrasonic welding.
  • the engagement means are defined by gluing and the lowered portion 5a of the first main face 5 has niches 10 for the accumulation of glue.
  • the construction of the frame and of the silkscreen printing unit including the silkscreen plate is as follows.
  • the brackets 9 are inserted and embedded in shaped channels 8 facing each other and may be of two types: slightly oversized compared to the shaped channels 8 for a forced insertion, if a substantially rigid frame 1 is desired, or the same size or slightly undersized compared to the shaped channels 8 for sliding and/or slightly loose insertion to make a frame 1 which is easily expandable and deformable.
  • the plate may be made smooth, with the tensioning during the work phase acting on the frame 1 coupled at the cavity 7.
  • the silkscreen plate 2 may be provided with the traditional gripping through-openings and the same are directly couplable for the tensioning of said plate if the embedded portions 5a have a breadth less than a centimetre, and the gripping through openings are at a distance from the perimeter of the plate of more than one centimetre.
  • the invention achieves some important advantages.
  • the frame 1 has a minimal thickness, extends on one side only of the silkscreen plate 1, has a simple structure and is defined by a minimum number of elements. Therefore, it is also economical.
  • brackets that determine the rigidity are then embedded and protected inside the frame, so that during handling of the frame they are not subject to shock or displacements.
  • the frame is thus versatile and of universal use as it not only has small dimensions and can easily vary its rigidity, but can also be combined with traditional plates provided with through holes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP15158737.5A 2014-06-06 2015-03-12 Rahmenstruktur zur unterstützung einer siebdruckplatte Not-in-force EP2952347B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20141038 2014-06-06

Publications (2)

Publication Number Publication Date
EP2952347A1 true EP2952347A1 (de) 2015-12-09
EP2952347B1 EP2952347B1 (de) 2017-05-24

Family

ID=51398704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15158737.5A Not-in-force EP2952347B1 (de) 2014-06-06 2015-03-12 Rahmenstruktur zur unterstützung einer siebdruckplatte

Country Status (4)

Country Link
EP (1) EP2952347B1 (de)
ES (1) ES2632575T3 (de)
HU (1) HUE032965T2 (de)
PL (1) PL2952347T3 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011023964A1 (en) * 2009-08-27 2011-03-03 Alpha Fry Limited Stencil printing frame
EP2529931A1 (de) * 2010-01-29 2012-12-05 Furetsu Kasuya Bildschirmstreckungsrahmen
GB2497086A (en) * 2011-11-29 2013-06-05 Architectural & Metal Systems Ltd Printing screen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011023964A1 (en) * 2009-08-27 2011-03-03 Alpha Fry Limited Stencil printing frame
EP2529931A1 (de) * 2010-01-29 2012-12-05 Furetsu Kasuya Bildschirmstreckungsrahmen
GB2497086A (en) * 2011-11-29 2013-06-05 Architectural & Metal Systems Ltd Printing screen

Also Published As

Publication number Publication date
PL2952347T3 (pl) 2017-09-29
HUE032965T2 (en) 2017-11-28
ES2632575T3 (es) 2017-09-14
EP2952347B1 (de) 2017-05-24

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