EP0533053B1 - Holder for cylindrical printing screens - Google Patents

Holder for cylindrical printing screens Download PDF

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Publication number
EP0533053B1
EP0533053B1 EP92115483A EP92115483A EP0533053B1 EP 0533053 B1 EP0533053 B1 EP 0533053B1 EP 92115483 A EP92115483 A EP 92115483A EP 92115483 A EP92115483 A EP 92115483A EP 0533053 B1 EP0533053 B1 EP 0533053B1
Authority
EP
European Patent Office
Prior art keywords
stencil
ring
holder
rings
end ring
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
EP92115483A
Other languages
German (de)
French (fr)
Other versions
EP0533053A1 (en
Inventor
Josef Glantschnig
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.)
J Zimmer Maschinenbau GmbH
Original Assignee
J Zimmer Maschinenbau GmbH
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 J Zimmer Maschinenbau GmbH filed Critical J Zimmer Maschinenbau GmbH
Publication of EP0533053A1 publication Critical patent/EP0533053A1/en
Application granted granted Critical
Publication of EP0533053B1 publication Critical patent/EP0533053B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/38—Screens, Frames; Holders therefor curved

Definitions

  • the invention relates to a stencil holder for circular stencils, wherein rotatably mounted receiving rings are provided for receiving and tensioning the round stencils provided with end rings, which, by means of stop parts, engage webs which protrude radially from the end rings and protrude radially from the end rings in the manner of a bayonet catch.
  • receiving rings and end rings cooperate in areas distributed over the entire circumference, there is a need to push the end rings axially into the receiving rings during installation and to bring them into engagement by twisting before tensioning the template.
  • This work requires some skill, since the template must be centered exactly on the receiving ring so that it can be pushed over the end ring. In the event of incorrect operation, the round template can be easily crushed and damaged.
  • connection of the template to the receiving devices provided on the machine is easier if the receiving rings only extend approximately over half the circumference of the end rings, so that the template can simply be inserted from above into the half-shell-shaped receiving device before it is tensioned.
  • such recording devices have the disadvantage that the tension of the template is not uniform over the entire circumference.
  • the object of the invention is to simplify the insertion of the template in a device of the type outlined at the outset in a manner which roughly corresponds to the situation with the receiving rings open on one side.
  • this object is achieved in that at least one protrusion or an additional edge area is provided on the receiving ring as a support and as an installation aid for inserting the template or the end ring into the receiving ring on its side facing the template (inside of the printing press or in the interior of the receiving ring) on which the template or the template end ring can be temporarily placed during the insertion process.
  • the operator has the hand previously required for centering, or the template can be inserted mechanically into the receiving ring at all, since the tray ensures the permanent centering of the circular template.
  • the shelf comprises at least one axially extending guide rail.
  • the shelf can only consist of two axially extending guide rails, in particular if the two guide rails correspond to the mutually facing edges of adjacent webs of the end ring. If, on the other hand, the shelf is designed as a cylindrically curved strip, this makes it easier to find the correct angular position afterwards. This can in turn be defined by the abutment of two guide rails on the mutually facing edges of adjacent webs or by the fact that a guide rail corresponds to a groove in the web of the end ring.
  • the template In order to prevent the template from accidentally falling off the tray, it is preferably provided with at least one axial stop for the webs of the end ring.
  • Fig. 1 shows the essential parts of a receiving ring 10 and a cooperating end ring 11 of a circular template 8, which have webs 7. These webs 7 are intended to engage behind stop parts 9 of the receiving ring 10 distributed over the circumference in the manner of a bayonet catch.
  • the end ring 11 is placed from above on a tray which, in the exemplary embodiment according to FIGS. 1-5, consists of a cylindrical strip 1a, 1b, 1c extending along the circumference of the receiving ring 10 .
  • the angular assignment of the receiving ring 10 and end ring 11 is given when the groove 3 rests in a web 7 of the end ring 11 on the guide rail 2.
  • the end ring 11 placed on it can be pushed into the interior of the end ring 10 from the position shown in FIG. 2, the guide rail 2 first together with the groove 3 and then another guide rail 4 together with the edge of a web 7 prevents tangential rotation.
  • the rotation of the circular template 8 indicated in FIG. 3 only takes place when the webs 7 are located at the end of the stop parts 9.
  • the rotation is ended when the groove 3 of the web 7, as shown in FIG. 4, is located in an axial extension of a driving lug 5 on a stop part 9.
  • the template 8 is removed by performing the method steps described with reference to FIGS. 1-5 in the reverse order. So that when the receiving rings 10 are finally pulled apart, the end rings 11 do not fall off the support, that is to say from the strip 1a, 1b, 1c, the strip 1a, 1b, 1c is delimited on the template side by a stop 6.
  • the tray provided according to the invention on which the template 8 with its end rings 11 is placed before being inserted into the receiving rings 10, does not have to be designed as a cylindrical strip 1a, 1b, 1c, as shown in FIGS. 1-5.
  • the end ring 11 is always guided during the axial insertion by the interaction of the guide rails 2, 2 'with the mutually facing edges of the webs 7, 7'.
  • the groove 3 only has the task of fixing the end position in cooperation with the driving nose 5.
  • the stops 6,6 ' which prevent the template from falling out, particularly during removal prevent, are formed here as short pins which extend in the circumferential direction of the end ring 11. With the end ring 11 fully pulled out, they engage behind its webs 7, 7 '. Otherwise, the process of installation and removal proceeds as described with reference to FIGS. 1-5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Replacement Of Web Rolls (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Manipulator (AREA)
  • Liquid Crystal (AREA)
  • Testing Of Coins (AREA)
  • Lasers (AREA)
  • Screen Printers (AREA)

Abstract

A cylindrical screen printing machine, wherein rotatably mounted holding rings (10) are provided for holding and clamping the circular printing screens (8) provided with end rings (11), which holding rings grip by means of stop parts behind webs (7) in the manner of a bayonet closure, said webs being distributed evenly over the circumference of the end rings (11) and projecting radially from said end rings (11), and wherein a projection or resting region (1a, 1b, 1c) is provided on the screen side of the holding ring (10) as a rest for the appropriate end ring (11) prior to insertion in the holding ring (10). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Schablonenaufnahme für Rundschablonen, wobei zur Aufnahme und zum Spannen der mit Endringen versehenen Rundschablonen drehbar gelagerte Aufnahmeringe vorgesehen sind, welche mittels Anschlagteilen gleichmäßig über den Umfang der Endringe verteilte, von den Endringen radial abstehende Stege nach Art eines Bajonettverschlusses hintergreifen.The invention relates to a stencil holder for circular stencils, wherein rotatably mounted receiving rings are provided for receiving and tensioning the round stencils provided with end rings, which, by means of stop parts, engage webs which protrude radially from the end rings and protrude radially from the end rings in the manner of a bayonet catch.

Wenn in dieser Weise Aufnahmeringe und Endringe in über den ganzen Umfang verteilten Bereichen zusammenwirken, besteht die Notwendigkeit, die Endringe beim Einbau axial in die Aufnahmeringe hineinzuschieben und vor dem Spannen der Schablone durch Verdrehen in Eingriff miteinander zu bringen. Diese Arbeit erfordert einige Geschicklichkeit, da die Schablone genau zum Aufnahmering zentriert werden muß, damit dieser über den Endring geschoben werden kann. Bei Fehlbedienung kann die Rundschablone leicht zerdrückt und beschädigt werden.If in this way receiving rings and end rings cooperate in areas distributed over the entire circumference, there is a need to push the end rings axially into the receiving rings during installation and to bring them into engagement by twisting before tensioning the template. This work requires some skill, since the template must be centered exactly on the receiving ring so that it can be pushed over the end ring. In the event of incorrect operation, the round template can be easily crushed and damaged.

Leichter ist die Verbindung der Schablone mit den an der Maschine vorgesehenen Aufnahmeeinrichtungen, wenn die Aufnahmeringe sich nur etwa über den halben Umfang der Endringe erstrecken, sodaß die Schablone einfach von oben her in die halbschalenförmige Aufnahme eingelegt werden kann, bevor sie gespannt wird. Derartige Aufnahmeeinrichtungen haben jedoch den Nachteil, daß die Spannung der Schablone nicht über den ganzen Umfang gleichmäßig erfolgt.The connection of the template to the receiving devices provided on the machine is easier if the receiving rings only extend approximately over half the circumference of the end rings, so that the template can simply be inserted from above into the half-shell-shaped receiving device before it is tensioned. However, such recording devices have the disadvantage that the tension of the template is not uniform over the entire circumference.

Aufgabe der Erfindung ist es, bei einer Einrichtung der eingangs skizzierten Art das Einlegen der Schablone in einer Weise zu vereinfachen, die in etwa der Situation bei einseitig offenen Aufnahmeringen entspricht.The object of the invention is to simplify the insertion of the template in a device of the type outlined at the outset in a manner which roughly corresponds to the situation with the receiving rings open on one side.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß am Aufnahmering als Ablage und als Einbauhilfe zum Einlegen der Schablone bzw. des Endringes in den Aufnahmering an dessen der Schablone zugewendeten Seite (Innenseite der Druckmaschine bzw. im Innenbereich des Aufnahmeringes mindestens ein Vorsprung oder ein zusätzlicher Randbereich vorgesehen ist, auf dem die Schablone bzw. der Schablonenendring während des Einlegevorganges vorübergehend abgelegt werden kann.According to the invention, this object is achieved in that at least one protrusion or an additional edge area is provided on the receiving ring as a support and as an installation aid for inserting the template or the end ring into the receiving ring on its side facing the template (inside of the printing press or in the interior of the receiving ring) on which the template or the template end ring can be temporarily placed during the insertion process.

Durch die erfindungsgemäße Ablage hat die Bedienungsperson die bisher zum Zentrieren benötigte Hand frei bzw. kann das Einschieben der Schablone in den Aufnahmering überhaupt maschinell erfolgen, da die Ablage für die dauernde Zentrierung der Rundschablone sorgt.With the tray according to the invention, the operator has the hand previously required for centering, or the template can be inserted mechanically into the receiving ring at all, since the tray ensures the permanent centering of the circular template.

Um die Einstellung der richtigen Winkellage zwischen Endring und Aufnahmering zu erleichtern und die einmal gefundene Lage aufrechtzuerhalten, ist vorzugsweise vorgesehen, daß die Ablage mindestens eine axial verlaufende Führungsschiene umfaßt.In order to facilitate the setting of the correct angular position between the end ring and the receiving ring and to maintain the position once found, it is preferably provided that the shelf comprises at least one axially extending guide rail.

Im einfachsten Fall kann die Ablage lediglich aus zwei axial verlaufenden Führungsschienen bestehen, insbesondere wenn die zwei Führungsschienen mit den einander zugewandten Rändern benachbarter Stege des Endringes korrespondieren. Wird andererseits die Ablage als zylindrisch gekrümmter Streifen ausgebildet, so erleichtert dies das nachträgliche Auffinden der richtigen Winkellage. Diese kann wiederum durch das Anliegen zweier Führungsschienen an den einander zugewandten Rändern benachbarter Stege definiert sein oder dadurch, daß eine Führungsschiene mit einer Nut im Steg des Endringes korrespondiert.In the simplest case, the shelf can only consist of two axially extending guide rails, in particular if the two guide rails correspond to the mutually facing edges of adjacent webs of the end ring. If, on the other hand, the shelf is designed as a cylindrically curved strip, this makes it easier to find the correct angular position afterwards. This can in turn be defined by the abutment of two guide rails on the mutually facing edges of adjacent webs or by the fact that a guide rail corresponds to a groove in the web of the end ring.

Um das unbeabsichtigte Herunterfallen der Schablone von der Ablage zu verhindern, ist diese vorzugsweise mit mindestens einem axialen Anschlag für die Stege des Endringes versehen.In order to prevent the template from accidentally falling off the tray, it is preferably provided with at least one axial stop for the webs of the end ring.

Weitere Einzelheiten der Erfindung werden anschließend anhand der Zeichnung erläutert. In dieser bezieht sich

  • Fig. 1 - 5 auf ein erstes Ausführungsbeispiel der Erfindung in verschiedenen Stadien der Annäherung bzw. Verbindung von Endring und Aufnahmering, Fig. 6 ist eine Fig. 1 entsprechende Darstellung eines zweiten Ausführungsbeispiels.
Further details of the invention are subsequently explained with reference to the drawing. In this relates
  • 1 to 5 show a first exemplary embodiment of the invention in various stages of the approach or connection of the end ring and the receiving ring, FIG. 6 is a representation corresponding to FIG. 1 of a second exemplary embodiment.

Fig. 1 zeigt die wesentlichen Teile eines Aufnahmeringes 10 und eines damit zusammenwirkenden Endringes 11 einer Rundschablone 8, welche Stege 7 aufweisen. Diese Stege 7 sind dazu bestimmt, über den Umfang verteilte Anschlagteile 9 des Aufnahmeringes 10 nach Art eines Bajonettverschlusses zu hintergreifen.Fig. 1 shows the essential parts of a receiving ring 10 and a cooperating end ring 11 of a circular template 8, which have webs 7. These webs 7 are intended to engage behind stop parts 9 of the receiving ring 10 distributed over the circumference in the manner of a bayonet catch.

Um die Verbindung von Endring 11 und Aufnahmering 10 herzustellen, wird der Endring 11 von oben her auf eine Ablage gelegt, welche beim Ausführungsbeispiel nach Fig. 1 - 5 aus einem sich entlang des Umfanges des Aufnahmeringes 10 erstreckenden zylindrischen Streifen 1a, 1b, 1c besteht.In order to establish the connection between the end ring 11 and the receiving ring 10, the end ring 11 is placed from above on a tray which, in the exemplary embodiment according to FIGS. 1-5, consists of a cylindrical strip 1a, 1b, 1c extending along the circumference of the receiving ring 10 .

Die winkelgerechte Zuordnung von Aufnahmering 10 und Endring 11 ist dann gegeben, wenn die Nut 3 in einem Steg 7 des Endringes 11 auf der Führungsschiene 2 aufliegt. Entlang dieser Führungsschiene 2 kann der aufgelegte Endring 11 aus der in Fig. 2 dargestellten Lage ins Innere des Endringes 10 eingeschoben werden, wobei zunächst die Führungsschiene 2 zusammen mit der Nut 3 und anschließend eine weitere Führungsschiene 4 zusammen mit dem Rand eines Steges 7 ein tangentiales Verdrehen verhindert. Das in Fig. 3 angedeutete Verdrehen der Rundschablone 8 erfolgt erst, wenn die Stege 7 sich endseitig von den Anschlagteilen 9 befinden. Die Verdrehung wird beendet, wenn sich die Nut 3 des Steges 7, so wie in Fig. 4 dargestellt, in axialer Verlängerung einer Mitnehmernase 5 an einem Anschlagteil 9 befindet. Beim anschließenden Spannen der Schablone 8 durch Auseinanderziehen der Endringe 11 rastet die Mitnehmernase 5 in die Nut 3 am Steg 7 ein und die Anlage ist betriebsbereit.The angular assignment of the receiving ring 10 and end ring 11 is given when the groove 3 rests in a web 7 of the end ring 11 on the guide rail 2. Along this guide rail 2, the end ring 11 placed on it can be pushed into the interior of the end ring 10 from the position shown in FIG. 2, the guide rail 2 first together with the groove 3 and then another guide rail 4 together with the edge of a web 7 prevents tangential rotation. The rotation of the circular template 8 indicated in FIG. 3 only takes place when the webs 7 are located at the end of the stop parts 9. The rotation is ended when the groove 3 of the web 7, as shown in FIG. 4, is located in an axial extension of a driving lug 5 on a stop part 9. When the template 8 is then tensioned by pulling the end rings 11 apart, the driver nose 5 engages in the groove 3 on the web 7 and the system is ready for operation.

Der Ausbau der Schablone 8 erfolgt durch Ausführung der anhand von Fig. 1 - 5 beschriebenen Verfahrensschritte in umgekehrter Reihenfolge. Damit beim abschließenden Auseinanderziehen der Aufnahmeringe 10 die Endringe 11 nicht von der Ablage, also vom Streifen 1a, 1b, 1c, herunterfallen, ist der Streifen 1a, 1b, 1c schablonenseitig durch einen Anschlag 6 begrenzt.The template 8 is removed by performing the method steps described with reference to FIGS. 1-5 in the reverse order. So that when the receiving rings 10 are finally pulled apart, the end rings 11 do not fall off the support, that is to say from the strip 1a, 1b, 1c, the strip 1a, 1b, 1c is delimited on the template side by a stop 6.

Die erfindungsgemäß vorgesehene Ablage, auf welche die Schablone 8 mit ihren Endringen 11 vor dem Einschieben in die Aufnahmeringe 10 abgelegt wird, muß nicht, wie in Fig. 1 - 5 dargestellt, als zylindrischer Streifen 1a, 1b, 1c ausgebildet sein. Beispielsweise wäre es möglich, so wie in Fig. 6 dargestellt, die Führungsschienen 2,2' selbst als Ablage zu verwenden. In diesem Fall erfolgt die Führung des Endringes 11 beim axialen Einschieben immer durch das Zusammenwirken der Führungsschienen 2,2' mit den einander zugewandten Rändern der Stege 7,7'. Die Nut 3 hat hier nur die Aufgabe, die Endstellung im Zusammenwirken mit der Mitnehmernase 5 zu fixieren. Die Anschläge 6,6', welche das Herausfallen der Schablone insbesondere beim Ausbau verhindern, sind hier als kurze Zapfen ausgebildet, welche in Umfangsrichtung des Endringes 11 verlaufen. Sie hintergreifen bei voll herausgezogenem Endring 11 dessen Stege 7,7'. Im übrigen verläuft der Vorgang des Ein- und Ausbaus wie anhand von Fig. 1 - 5 beschrieben.The tray provided according to the invention, on which the template 8 with its end rings 11 is placed before being inserted into the receiving rings 10, does not have to be designed as a cylindrical strip 1a, 1b, 1c, as shown in FIGS. 1-5. For example, it would be possible, as shown in FIG. 6, to use the guide rails 2, 2 'themselves as a shelf. In this case, the end ring 11 is always guided during the axial insertion by the interaction of the guide rails 2, 2 'with the mutually facing edges of the webs 7, 7'. The groove 3 only has the task of fixing the end position in cooperation with the driving nose 5. The stops 6,6 ', which prevent the template from falling out, particularly during removal prevent, are formed here as short pins which extend in the circumferential direction of the end ring 11. With the end ring 11 fully pulled out, they engage behind its webs 7, 7 '. Otherwise, the process of installation and removal proceeds as described with reference to FIGS. 1-5.

Claims (8)

  1. A stencil holder for round stencils wherein for holding and clamping the round stencils which are provided with end rings there are provided rotatably mounted holder rings which by means of abutment portions engage in the manner of a bayonet lock behind flange portions which project radially from the end rings and which are uniformly distributed over the peripheries of the end rings, characterised in that provided on the holder ring (10) as a support and as an installation aid for insertion of the stencil or the end ring (11) into the holder ring (10) at the side thereof which is towards the stencil there is provided at least one projection or an additional edge region (1a, 1b, 1c) on which the stencil or the stencil end ring (11) can be temporarily supported during the insertion operation.
  2. A stencil holder according to claim 1 characterised in that at least one axially extending guide bar (2, 2') is provided as the projection.
  3. A stencil holder according to claim 2 characterised in that the guide her (2) corresponds to a groove (3) in a flange portion (7) of the end ring (11).
  4. A stencil holder according to claim 3 characterised in that when the end ring (11) and the holder ring (10) are connected the groove (3) latches into an entrainment nose (5) at the side, remote from the stencil (8), of an abutment portion (9) in the holder ring (10).
  5. A stencil holder according to one of claims 2 to 4 characterised in that the guide bars (2, 2') forming the projection are extended by a further guide bar (4) which is arranged in the interior of the holder ring (10) and which bears only at one side against a flange portion (7) of the end ring (11).
  6. A stencil holder according to claim 2 or claim 5 characterised in that two guide bars (2, 2') correspond to the mutually facing edges of adjacent flange portions (7, 7') of the end ring (11).
  7. A stencil holder according to one of claims 1 to 6 characterised in that the additional edge region (1a, 1b, 1c) is in the form of a cylindrically curved strip (1) which corresponds to the outside diameter of the flange portions (7, 7') of the end ring (11).
  8. A stencil holder according to one of claims 1 to 7 characterised in that the additional edge region (1a, 1b, 1c) is provided on the stencil side with at least one axial abutment (6, 6') for the flange portions (7, 7') of the end ring (11).
EP92115483A 1991-09-17 1992-09-10 Holder for cylindrical printing screens Expired - Lifetime EP0533053B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0186791A AT395694B (en) 1991-09-17 1991-09-17 TEMPLATE HOLDER FOR ROUND TEMPLATES
AT1867/91 1991-09-17

Publications (2)

Publication Number Publication Date
EP0533053A1 EP0533053A1 (en) 1993-03-24
EP0533053B1 true EP0533053B1 (en) 1996-03-20

Family

ID=3522718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115483A Expired - Lifetime EP0533053B1 (en) 1991-09-17 1992-09-10 Holder for cylindrical printing screens

Country Status (3)

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EP (1) EP0533053B1 (en)
AT (2) AT395694B (en)
DE (1) DE59205744D1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685336A1 (en) * 1994-05-30 1995-12-06 Stork X-Cel B.V. Device for placing a cylindrical screen in, and removing it from, a rotary screen printing machine.
DE10219845C1 (en) 2002-05-03 2003-11-20 Koenig & Bauer Ag Screen printing machine and screen cylinder
ITMO20030050A1 (en) * 2003-02-28 2004-09-01 Ciemme 80 S R L METHOD FOR DECORATING TILES.
DE102013006698A1 (en) * 2013-04-18 2014-10-23 Gallus Ferd. Rüesch AG Rotary screen, mounting device, exposure device and washing device with quick release
WO2017186261A1 (en) 2016-04-25 2017-11-02 J. Zimmer Maschinenbau Ges.m.b.H. Round template receiver ring and rotational application device provided with same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603614A (en) * 1967-05-26 1971-05-10
OA02976A (en) * 1967-09-26 1970-12-15 Buser Ag Maschf Fritz Rotary film printing machine.
CH463444A (en) * 1967-09-26 1968-10-15 Buser Ag Maschf Fritz Rotary film printing machine
NL6910510A (en) * 1969-07-09 1971-01-12
AT308041B (en) * 1972-04-28 1973-05-15 Zimmer Peter ROTARY STENCIL PRINTING MACHINE
DE2254819C2 (en) * 1972-11-09 1982-11-11 Mitter & Co, 4815 Schloss Holte Cylinder stencil for a printing unit of a screen printing machine
CH549474A (en) * 1973-01-29 1974-05-31 Buser Ag Maschf Fritz DEVICE ON ROTARY FILM PRINTING MACHINE FOR DETACHABLE ATTACHMENT OF A ROUND STENCIL.
AT382821B (en) * 1983-08-04 1987-04-10 Zimmer Johannes ROUND TEMPLATE PRINTING MACHINE

Also Published As

Publication number Publication date
ATE135634T1 (en) 1996-04-15
AT395694B (en) 1993-02-25
DE59205744D1 (en) 1996-04-25
EP0533053A1 (en) 1993-03-24
ATA186791A (en) 1992-07-15

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