EP1595698A2 - Siebdruckmaschine mit mehreren Stationen - Google Patents

Siebdruckmaschine mit mehreren Stationen Download PDF

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Publication number
EP1595698A2
EP1595698A2 EP20050103919 EP05103919A EP1595698A2 EP 1595698 A2 EP1595698 A2 EP 1595698A2 EP 20050103919 EP20050103919 EP 20050103919 EP 05103919 A EP05103919 A EP 05103919A EP 1595698 A2 EP1595698 A2 EP 1595698A2
Authority
EP
European Patent Office
Prior art keywords
vacuum
vacuum chamber
belt
mobile
machine according
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.)
Withdrawn
Application number
EP20050103919
Other languages
English (en)
French (fr)
Inventor
Alberto Zamboni
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.)
Siasprint Srl
Original Assignee
Siasprint Srl
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 Siasprint Srl filed Critical Siasprint Srl
Publication of EP1595698A2 publication Critical patent/EP1595698A2/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/10—Machines for multicolour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0863—Machines with a plurality of flat screens mounted on a turntable
    • 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
    • B41F15/20—Supports for workpieces with suction-operated elements

Definitions

  • the present invention relates to a multistation screen printing machine.
  • the present invention relates to a multistation screen printing machine wherein a number of colours, and perhaps a number of sheets, can be printed at the same time.
  • multistation screen printing machines i.e. machines able to treat a number of colours, and perhaps sheets, at the same time.
  • Such machines typically have a circular shape, or a shape similar to that of a more or less flattened oval (e.g. the shape of a rectangle, whose shorter sides are semicircles).
  • the machine has a frame of such a shape, along which a moving system, e.g. a chain, slides.
  • the moving chain drags a number of printing tables, whose structure will be described in a while.
  • a number of processing stations are fixed to the above-mentioned frame. Among such stations, some act as printing islands for a given colour.
  • stations act as screen printing furnaces, aimed at drying the colour layer deposited by the previous printing island.
  • Loading and unloading stations are also provided. The number and sequence of such stations may, of course, vary according to the specific model and, perhaps, to customer needs.
  • a conventional solution in this respect is a table including many small holes, under which a vacuum, that keeps the support fixed to the table, is created.
  • every mobile table is equipped with its own vacuum system, e.g. an extractor fan, with the obvious complications in terms of weight, cost and maintainance.
  • a vacuum is created in a C-shaped tube that follows the profile of the chain.
  • the open side (or, more exactly, fitted with many large holes) of such a tube faces the outer side of the machine.
  • a suitable mobile belt rests on such outer side, thanks to both the vacuum and the suitable L-shaped guides that prevent it from falling down when the device is not powered and, in any case, constrain its motion.
  • the belt is equipped with suitable pipe unions, connected to the vacuum chamber of the mobile table by flexible tubes. The belt, driven by the chain, slides along the outer side of the C-shaped tube, thus preventing the mobile tables from loosing their vacuum.
  • the fixed vacuum chamber consists of a C-shaped tube bent in the shape of a toroid, with its open side facing upwards.
  • the mobile vacuum chamber, to which the mobile tables are connected, is made up of a similar toroid, with a larger cross section and its open side facing downwards.
  • the mobile vacuum chamber is wedged into the fixed chamber, so that the former can slide along the latter.
  • the mobile chamber is in turn coated, throughout all its diameter, by a suitable elastic membrane that, through the effect of the vacuum, tightens up and acts as a sealed interface between the fixed chamber and the mobile chamber.
  • the wedged toroid solution only applies to circular machines, which on one side is a commercial limitation and, on the other side, refers to a machine that exploits the available floor space less efficiently than the quasi-oval machines.
  • Applicant has however pointed out that, by employing such a solution, it is only possible to alleviate, as opposed to solve, the tension problem.
  • Applicant has observed that even if it were possible, after further development work, to develop and build a fixed-chamber-and-mobile-belt system wherein the tension problem would be solved, the system would suffer anyway from a further disadvantage, related to the belt movement.
  • Applicant has realized a mobile vacuum system which is able to take care of the above-mentioned troubles, wherein the vacuum is produced in a fixed structure and intercepted by the mobile tables of the machine through a fixed belt, on which the mobile tables are sliding through a sliding block.
  • An embodiment of present invention concerns a screen printing machine, including a curved structure that defines a working path, along which a plurality of processing stations, a plurality of mobile printing tables, dragged along said path and intercepting said processing stations and a vacuum chamber, placed along said curved structure, associated to such a path and aimed at generating a vacuum inside it, are placed, each mobile table having an upper surface that restrains a printing substrate through the vacuum generated by said vacuum chamber and transferred to said table, characterized in that it includes a fixed belt that covers the holes and openings in said vacuum chamber, a sliding block, linked to each mobile table, that moves together with it and transfers the vacuum generated by said vacuum chamber to said table by lifting the belt off said holes and letting the vacuum expand into said sliding block.
  • the screen printing machine of figure 1 includes a curved structure 2, e.g. a rectangular structure whose smaller sides are actually semicircles, defining a working path.
  • a curved structure 2 e.g. a rectangular structure whose smaller sides are actually semicircles, defining a working path.
  • guides an external guide 3 and an internal guide 4
  • the printing tables 5 that move along said working path.
  • a number of processing stations S are placed in a fixed position with respect to the curved structure. Some of said stations act as printing stations for a given colour. Other stations, instead, consist of screen printing furnaces, aimed at drying the colour layer deposited in the previous printing island. Loading and unloading stations are also provided. The number and sequence of such stations may of course vary according to the specific model and, perhaps, to customer needs. To this end, for the sake of simplicity and purely as an example, in figure 1 four processing stations are shown. Within the present invention, the number and structure of said processing stations may freely vary.
  • Such curved structure includes a vacuum chamber 8, wherein a vacuum is created by e.g. an extractor fan, made up of e.g. an open C-shaped tube (or fitted with large holes or openings), whose perforated side e.g. faces the outer side of the machine.
  • a vacuum is created by e.g. an extractor fan, made up of e.g. an open C-shaped tube (or fitted with large holes or openings), whose perforated side e.g. faces the outer side of the machine.
  • a fixed belt 9 perhaps held in place by suitable L-shaped guides, pushed against the vacuum chamber by its vacuum.
  • Each mobile table is fitted with a sliding block 10, preferably placed under the table, that slides along the belt and is linked to the vacuum chamber. The sliding block slides along the fixed belt and lifts it, thus allowing a vacuum to be created into the sliding block, since the belt is narrower than the sliding block.
  • the structure of the above-mentioned sliding block is schematically shown in figures 2 and 3.
  • the sliding block also includes a pipe union 15, linked to the vacuum chamber 8 of the mobile table 5, that allows the sliding block to intercept the vacuum generated by the vacuum chamber and transmit it to the mobile table, which is fitted with suitable holes on its upper surface, in such a way as to keep the printed substrate, e.g. a paper sheet, on which the processing stations are operating, in touch with such a surface.
  • the proposed invention gets rid of the troubles caused by the tensions that arise between the belt and the dragging chain due to their different lengths, that may even cause the belt to rip off or, less pessimistically, to either crumple or tighten up, resulting in a lower-quality vacuum or even in a vacuum loss.
  • the belt wears down less than in the conventional approaches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP20050103919 2004-05-13 2005-05-11 Siebdruckmaschine mit mehreren Stationen Withdrawn EP1595698A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040963 ITMI20040963A1 (it) 2004-05-13 2004-05-13 Macchina da stampa serigrafica a piu' stazioni di lavoro
ITMI20040963 2004-05-13

Publications (1)

Publication Number Publication Date
EP1595698A2 true EP1595698A2 (de) 2005-11-16

Family

ID=34939784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050103919 Withdrawn EP1595698A2 (de) 2004-05-13 2005-05-11 Siebdruckmaschine mit mehreren Stationen

Country Status (2)

Country Link
EP (1) EP1595698A2 (de)
IT (1) ITMI20040963A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009030899A1 (en) * 2007-09-03 2009-03-12 Dek International Gmbh Workpiece processing system and method
CN103203978A (zh) * 2013-04-03 2013-07-17 邱耀光 多色印刷机的真空吸附系统
CN104494296A (zh) * 2014-12-31 2015-04-08 东莞市塘厦鸿镁丝印移印机械厂 一种气动步进式穿梭移动工作台
DE102024122632A1 (de) 2023-08-10 2025-02-13 Ulrich Loser Vorrichtung und Verfahren zur Förderung von zu bedruckenden Gegenständen in einer Druckmaschine und Druckmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115489195A (zh) * 2022-09-08 2022-12-20 东莞佳华自动化科技有限公司 一种多色印刷生产线以及印刷方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009030899A1 (en) * 2007-09-03 2009-03-12 Dek International Gmbh Workpiece processing system and method
US10682848B2 (en) 2007-09-03 2020-06-16 Asm Assembly Systems Singapore Pte. Ltd. Workpiece processing system and method
CN103203978A (zh) * 2013-04-03 2013-07-17 邱耀光 多色印刷机的真空吸附系统
CN103203978B (zh) * 2013-04-03 2014-11-19 深圳市科精诚印刷机械制造有限公司 多色印刷机的真空吸附系统
CN104494296A (zh) * 2014-12-31 2015-04-08 东莞市塘厦鸿镁丝印移印机械厂 一种气动步进式穿梭移动工作台
CN104494296B (zh) * 2014-12-31 2017-02-22 东莞市塘厦鸿镁丝印移印机械厂 一种气动步进式穿梭移动工作台
DE102024122632A1 (de) 2023-08-10 2025-02-13 Ulrich Loser Vorrichtung und Verfahren zur Förderung von zu bedruckenden Gegenständen in einer Druckmaschine und Druckmaschine

Also Published As

Publication number Publication date
ITMI20040963A1 (it) 2004-08-13

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