EP0622190B1 - Device for rigidly fining a thin-walled hollow cylinder - Google Patents

Device for rigidly fining a thin-walled hollow cylinder Download PDF

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Publication number
EP0622190B1
EP0622190B1 EP93106913A EP93106913A EP0622190B1 EP 0622190 B1 EP0622190 B1 EP 0622190B1 EP 93106913 A EP93106913 A EP 93106913A EP 93106913 A EP93106913 A EP 93106913A EP 0622190 B1 EP0622190 B1 EP 0622190B1
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EP
European Patent Office
Prior art keywords
cylinder
carrier
hollow cylinder
hollow
carrier cylinder
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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
EP93106913A
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German (de)
French (fr)
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EP0622190A1 (en
Inventor
Erwin Suchan
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Schablonentechnik Kufstein GmbH
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Schablonentechnik Kufstein GmbH
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Priority to AT93106913T priority Critical patent/ATE134928T1/en
Priority to EP93106913A priority patent/EP0622190B1/en
Priority to DE59301804T priority patent/DE59301804D1/en
Publication of EP0622190A1 publication Critical patent/EP0622190A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device is already known from DE-OS 36 01 327.
  • a thin-walled hollow cylinder is clamped onto a stencil tension roller.
  • the stencil tensioning roller is designed as a circular cylinder which is expandable in the circumferential direction and runs precisely in the tensioned state.
  • the template tensioning roller is preferably pneumatically expandable.
  • stencils which, for. B. used in the field of textile printing technology, design in a photomechanical way.
  • a hollow cylinder with a wall thickness of a few hundredths to a few tenths of a millimeter, already designed as a thin, cylindrical metal screen, can be coated with a very thin lacquer or polymer layer.
  • This lacquer or polymer layer is then z. B. evaporated and / or burned at a predetermined pattern by means of a focused laser beam.
  • a still liquid polymer layer can be applied to the thin, cylindrical metal screen and, if necessary, thermally pre-dried there, so that the surface no longer appears sticky. Then the surface, e.g. B. also cured by a focused laser beam at those points by exposure to light at which the desired pattern requires the lacquer to remain and thus to close the small openings in the metal sieve.
  • a template can be made by perforating a thin-walled and still unperforated hollow cylinder, the z. B. consists of a metal sheet or a plastic film, the punching is in turn done by a focused laser beam.
  • the hollow cylinder When the hollow cylinder is exposed point by point, it becomes very quickly rotated around its cylinder axis while the focal point of the incident radiation is shifted in the longitudinal direction of the cylinder axis.
  • the focal point therefore sweeps over a helical path on the surface of the hollow cylinder, so that it can be engraved in the desired manner by switching the exposure beam on and off.
  • the invention has for its object to develop the device of the type mentioned in such a way that by appropriate design of flow paths between the carrier cylinder and the hollow cylinder the latter can be properly centered and completely immobilized.
  • a device for dimensionally stable clamping of a thin-walled hollow cylinder, with a hollow support cylinder that can be rotated about its cylinder axis and over which the hollow cylinder can be pushed is characterized according to the invention in that there are a large number of through openings in the cylinder wall of the support cylinder, both in longitudinal as well as distributed in the circumferential direction of the carrier cylinder are, the outer diameter of the support cylinder is selected so that the hollow cylinder comes to rest on it with only a slight play, and a fluid under pressure flows through the through openings of the support cylinder from the inside to the outside.
  • the carrier cylinder and the hollow cylinder are designed so that there is only a very slight play between the inner diameter of the hollow cylinder and the outer diameter of the carrier cylinder, which is for example only a few hundredths to tenths of a millimeter.
  • the fluid flowing out of the through openings of the carrier cylinder therefore causes the hollow cylinder to be centered very precisely on the carrier cylinder. This centering is retained even if a large part of the openings to be exposed due to the pattern are already present in the hollow cylinder and the fluid can flow out of them.
  • the flow that forms in the annular space between the carrier cylinder and the hollow cylinder causes an extraordinarily good centering and strong damping of the otherwise unavoidable vibrations of the hollow cylinder relative to the carrier cylinder, as was determined on the basis of the control of patterns which were produced with the aid of printing stencils produced in this way.
  • the through openings are arranged uniformly distributed both in the longitudinal and in the circumferential direction of the carrier cylinder. This facilitates the manufacture of the carrier cylinder.
  • the distribution of the through openings in the longitudinal direction of the carrier cylinder can, however, also change according to a predetermined function in order in this way to better center or dampen sections of the hollow cylinder which tend to vibrate more strongly. In other words, in those areas in which larger vibrations (antinodes) of the hollow cylinder are to be expected, there may be a greater density of through openings than in those areas in which vibrations of the hollow cylinder do not occur as strongly.
  • the size of the through openings can also be correspondingly can be chosen to achieve the same purpose.
  • the through openings are preferably present essentially in the entire area of the carrier cylinder covered by the hollow cylinder, so that the end regions of the hollow cylinder can also be centered or damped, so that the hollow cylinder can be used over its entire length to form a pattern, if possible.
  • the damping effect can be further improved by inclining the through openings with a greater wall thickness of the carrier cylinder, preferably in the longitudinal direction of its cylinder axis. In this case, the wall thickness of the carrier cylinder can be in the millimeter range.
  • the wall thickness can be in the range from 0.15 to 0.5 mm, so that support cylinders which can be produced by electroplating can be used, which can be produced at extremely low cost.
  • the carrier cylinder is closed on its two end faces by rotatably mounted centering cylinders which receive it, at least one of which has a coaxial through-channel.
  • the fluid flows through the through-channel into the interior of the carrier cylinder and then through its through-openings into the annular space between the hollow cylinder and the carrier cylinder. If both centering cylinders are provided with coaxial through-channels, an even distribution of pressure can be achieved inside the carrier cylinder and thus also in the annular space between the hollow cylinder and carrier cylinder.
  • One of the centering cylinders is coupled to a rotary drive in order to set the carrier cylinder in rotation.
  • the carrier cylinder can be firmly connected to both centering cylinders and form a unit.
  • the carrier cylinder itself can, for. B. consist of metal, so that it is extremely dimensionally stable. But it can also be made of plastic if the wall thickness is chosen accordingly. Sufficient dimensional stability can also be achieved in this case.
  • the centering cylinder coupled to the rotary drive has a conical extension onto which an end face of the hollow cylinder can be pushed. A certain pre-centering of the hollow cylinder can take place via this conical extension, whereby the results with regard to centering and damping can be improved even further.
  • the centering cylinder which is not coupled to the rotary drive, is designed as a rotating centering cylinder and is held by a tailstock center point.
  • the centering cylinder and the tailstock center tip can each be provided with central through-channels which run in the longitudinal direction of these elements and are connected to one another.
  • the interior of the carrier cylinder can also be supplied with the pressurized fluid via these through-channels.
  • the tailstock center point can be removed, including the tailstock, or can be lowered in the corresponding carrier bed, so that the hollow cylinder can be pushed onto or removed from the carrier cylinder.
  • blower or air compression device By means of a blower or air compression device, air is blown through said through-channels into the interior of the carrier cylinder, wherein a separate blower or air compression device can be provided for each side of the carrier cylinder. A common facility can also be used for both sides.
  • the blower or. Air compression devices are preferably located below a bed carrying the carrier cylinder in order to obtain the most compact possible device.
  • a device for fixing the hollow cylinder relative to the carrier cylinder is provided. This ensures that the hollow cylinder cannot move in the circumferential direction or in the axial direction of the carrier cylinder.
  • a device for sealing a gap be present between the hollow cylinder and carrier cylinder on one end face of the hollow cylinder, preferably where the end face of the hollow cylinder lies on the conical extension.
  • an adhesive tape can be used for fixing the hollow cylinder to the carrier cylinder and for sealing the gap between the hollow cylinder and carrier cylinder.
  • an adhesive tape can be used for fixing the hollow cylinder to the carrier cylinder and for sealing the gap between the hollow cylinder and carrier cylinder.
  • a slotted, conical ring can also be placed on the extension or tension clamps, etc., can be used as the fixing device.
  • the device is preferably used for dimensionally stable clamping of screen printing cylinders for photomechanical design.
  • screen printing cylinders are mainly used in the field of textile printing technology, but can also be used for printing on other materials.
  • the engraving device consists of a rigid machine bed 1, which is mounted on two columns 2 and 3. On the machine bed 1 there are a headstock 4 and a tailstock 5 arranged at a distance from it. On the tailstock 5, a tailstock center point 6 is rotatably mounted pointing in the direction of the headstock 4.
  • a carrier cylinder 7 is rotatably held between the headstock 4 and the tailstock center point 6, specifically via the centering cylinder on the end face 8 and 9.
  • the centering cylinders 8 and 9 each project to a small extent into the front of the carrier cylinder 7 and can be firmly connected to the latter.
  • the carrier cylinder and the centering cylinders 8 and 9 can thus form a structural unit.
  • the centering cylinder 8 can be inserted with its free end face into the headstock 4 and is rotatably supported there.
  • An existing and not shown drive in the headstock 4 serves to set the centering cylinder 8 and with it the carrier cylinder 7 in rotation.
  • the tailstock-side centering cylinder 9 is provided on its free end face with a central recess for receiving the tailstock center tip 6.
  • the unit consisting of the centering cylinders 8 and 9 and the carrier cylinder 7 can be rotated between the headstock 4 and the tailstock 5 about their longitudinal or cylindrical axis, which runs parallel to the longitudinal direction of the bed 1.
  • the tailstock 5 can also be displaced in order to be able to insert the tailstock center point 6 into the recess on the free end face of the centering cylinder 9.
  • the tailstock 5 can either be removed from the machine bed 1 or sunk into it, to the extent that a thin-walled hollow cylinder 10 can be pushed onto the carrier cylinder 7, as will be explained.
  • the circumferential side of the centering cylinder 9 does not protrude beyond the lateral surface of the carrier cylinder 7. At the headstock end of the centering cylinder 8, however, this can be provided in the direction of the headstock 4 with a conical extension 11 onto which the hollow cylinder 10 is pushed with its one end face.
  • Both the centering cylinder 8 and the centering cylinder 9 and the tailstock center point 6 are provided with central through bores 12, 13 and 14, the through bores 13 and 14 being connected to one another.
  • the through bores 12 and 14 are each connected to a blower unit 17, 18 via pipes or flexible hoses 15 and 16.
  • These blower units 17, 18 are located within the machine bed 1 and can, for. B. annular chamber blower, the Can generate pressures of up to about 1.0 bar with a correspondingly large delivery rate.
  • so-called roots blowers can also be provided to generate the necessary compressed air.
  • the carrier cylinder 7 is provided with small and radially extending through openings 19 from which air can flow out. This air is inside the carrier cylinder 7 under an overpressure of about 0.1 to 1.0 bar.
  • the through openings 19 are arranged evenly distributed both in the circumferential direction and in the longitudinal direction of the carrier cylinder 7, namely over the entire length of the carrier cylinder 7, and z. B. diameter from 0.2 to 0.5 mm. Their distance in the longitudinal direction of the carrier cylinder 7 is approximately 500 mm, while a mutual distance of approximately 80 mm is provided in the circumferential direction of the carrier cylinder 7.
  • the carrier cylinder 7 itself can have a diameter of several tens of centimeters and a length of several meters. It can be rotated at approx. 600 to 1200 revolutions per minute by the drive device in the headstock 4.
  • the hollow cylinder 10 rests on the carrier cylinder 7 with only slight play.
  • the thickness of the annular gap between the inner diameter of the hollow cylinder 10 and the outer diameter of the carrier cylinder 7 is, for example, only a few hundredths to tenths of a millimeter, e.g. B. at 0.04 mm.
  • the hollow cylinder 10 can be pushed onto the carrier cylinder 7 and over the centering cylinder 9.
  • the hollow cylinder 10 is pushed so far over the carrier cylinder 7 until the end face of the hollow cylinder 10 that is attached runs onto the conical extension 11 of the centering cylinder 8.
  • the hollow cylinder 10 preferably has the same axial length as the carrier cylinder 7, so that the other end of the hollow cylinder 10 then comes to rest in the region of the other centering cylinder 9.
  • the hollow cylinder 10 is then in the region of the conical Extension 11 fixed to the centering cylinder 8, for example by means of an adhesive tape 21 which is glued on in the circumferential direction (fixing device).
  • This adhesive tape 21 can also have a sealing function in order to seal the gap that still exists between the hollow cylinder 10 and the conical extension 11.
  • the other end of the hollow cylinder 10 remains unsecured or free.
  • the hollow cylinder 10 lying on the carrier cylinder can be engraved or subjected to focused radiation (S).
  • a carriage 23 runs on guides 24 and 25, which extend parallel to the longitudinal axis of the carrier cylinder 7.
  • One of the guides 25 is designed as a spindle, which is driven by a stepper motor 26.
  • the carriage 23 can therefore be moved or displaced parallel to the longitudinal direction of the carrier cylinder 7 when the spindle 25 rotates.
  • This carriage 23 receives an engraving device, not shown.
  • the latter can consist of a deflecting mirror with focusing optics 26 or directly from a small solid-state laser with a lens system which focuses the laser beam onto the surface of the cylinder jacket of the hollow cylinder 10.
  • the first-mentioned exposure option is already apparent, for example, from DE-OS 36 01 327 mentioned at the beginning.

Abstract

A device for rigidly mounting a thin-walled hollow cylinder (10) comprises a hollow support cylinder (7) which is rotatable about its cylinder axis and over which the hollow cylinder (10) can be fitted. A pressurised fluid flows from the inside to the outside through the cylinder wall of the support cylinder (7). For this purpose there are a plurality of passage openings (19) in the cylinder wall of the support cylinder (7), which passage openings are arranged distributed both in the longitudinal and in the circumferential direction of the support cylinder (7). The outside diameter of the support cylinder (7) is selected such that the hollow cylinder (10) comes to rest thereon with only little clearance of some hundredths to tenths of a millimetre. If air is blown into the support cylinder (7), a flowing air cushion with very good centring and vibration-damping characteristics is produced in the thin annular space formed by the support cylinder (7) and hollow cylinder (10). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung gemäß dem Oberbegriff des Patentanspruchs 1. Eine derartige Vorrichtung ist bereits aus der DE-OS 36 01 327 bekannt.The invention relates to a device according to the preamble of claim 1. Such a device is already known from DE-OS 36 01 327.

Bei dieser bekannten Vorrichtung wird ein dünnwandiger Hohlzylinder auf eine Schablonenspannwalze aufgespannt. Die Schablonenspannwalze ist dabei als ein in Umfangsrichtung expandierbarer, im gespannten Zustand genau laufender Kreiszylinder ausgebildet. Vorzugsweise ist die Schablonenspannwalze pneumatisch expandierbar.In this known device, a thin-walled hollow cylinder is clamped onto a stencil tension roller. The stencil tensioning roller is designed as a circular cylinder which is expandable in the circumferential direction and runs precisely in the tensioned state. The template tensioning roller is preferably pneumatically expandable.

Mit Hilfe der genannten Vorrichtung lassen sich Schablonen, die z. B. im Bereich der Textildrucktechnik zum Einsatz kommen, auf photomechanischem Wege dessinieren.With the help of the device mentioned stencils, which, for. B. used in the field of textile printing technology, design in a photomechanical way.

Dazu kann ein bereits als dünnes, zylinderförmiges Metallsieb ausgebildeter Hohlzylinder mit einer Wandstärke von einigen hundertstel bis zu einigen zehntel Millimetern mit einer ebenfalls sehr dünnen Lack- oder Polymerschicht überzogen werden. Diese Lack- oder Polymerschicht wird dann z. B. mittels eines fokussierten Laserstrahls an musterbedingt vorbestimmten Stellen abgedampft und/oder verbrannt.For this purpose, a hollow cylinder with a wall thickness of a few hundredths to a few tenths of a millimeter, already designed as a thin, cylindrical metal screen, can be coated with a very thin lacquer or polymer layer. This lacquer or polymer layer is then z. B. evaporated and / or burned at a predetermined pattern by means of a focused laser beam.

Ebenso kann eine noch flüssige Polymerschicht auf das dünne, zylinderförmige Metallsieb aufgetragen und dort ggf. thermisch vorgetrocknet werden, so daß die Oberfläche nicht mehr klebrig erscheint. Anschließend wird die Oberfläche, z. B. ebenfalls durch einen fokussierten Laserstrahl, an jenen Stellen durch Lichteinwirkung ausgehärtet, an welchen das gewünschte Muster ein Verbleiben des Lacks und somit ein Verschließen der kleinen Öffnungen des Metallsiebs verlangt. Auch läßt sich eine Schablone durch Lochung eines dünnwandigen und noch ungelochten Hohlzylinders herstellen, der z. B. aus einem Metallblech oder aus einer Kunststoff-Folie besteht, wobei das Lochen wiederum durch einen fokussierten Laserstrahl erfolgt.Likewise, a still liquid polymer layer can be applied to the thin, cylindrical metal screen and, if necessary, thermally pre-dried there, so that the surface no longer appears sticky. Then the surface, e.g. B. also cured by a focused laser beam at those points by exposure to light at which the desired pattern requires the lacquer to remain and thus to close the small openings in the metal sieve. Also, a template can be made by perforating a thin-walled and still unperforated hollow cylinder, the z. B. consists of a metal sheet or a plastic film, the punching is in turn done by a focused laser beam.

Bei der punktweisen Belichtung des Hohlzylinders wird dieser sehr schnell um seine Zylinderachse gedreht, während der Fokuspunkt der auftreffenden Strahlung in Längsrichtung der Zylinderachse verschoben wird. Der Fokuspunkt überstreicht daher eine wendelförmige Bahn auf der Oberfläche des Hohlzylinders, so daß sich dieser durch Ein- und Ausschalten des Belichtungsstrahls in gewünschter Weise gravieren läßt.When the hollow cylinder is exposed point by point, it becomes very quickly rotated around its cylinder axis while the focal point of the incident radiation is shifted in the longitudinal direction of the cylinder axis. The focal point therefore sweeps over a helical path on the surface of the hollow cylinder, so that it can be engraved in the desired manner by switching the exposure beam on and off.

In all diesen Fällen ist die genaue Rundhaltung und Führung des langen und extrem dünnwandigen Hohlzylinders während dessen Drehbewegung unbedingt erforderlich. Es konnten bisher allerdings keine voll befriedigenden Ergebnisse erzielt werden, da die expandierbare Schablonenspannwalze während der Expansion abhängig von der erforderlichen Ausdehnung zu ungenauerAusweitung neigt, wodurch oftmals die gewünschte Führungsgenauigkeit verfehlt wurde. Innen und außen gelegene Führungsringe können andererseits ohne Spiel nicht verschoben werden und führen deswegen zu ungenauem Lauf des dünnen Hohlzylinders auch dann, wenn diese Ringe als Luftlager ausgebildet werden. In diesem Fall kann weder eine genaue Auszentrierung noch eine Ruhigstellung der Schablone im gewünschten Umfang erhalten werden.In all of these cases, it is absolutely necessary to keep the long and extremely thin-walled hollow cylinder exactly round and to guide it while it is rotating. So far, however, it has not been possible to achieve completely satisfactory results, since the expandable stencil tensioning roller tends to be inaccurate expansion during expansion, depending on the required expansion, which often means that the desired guiding accuracy has been missed. On the other hand, inside and outside guide rings cannot be moved without play and therefore lead to inaccurate running of the thin hollow cylinder even if these rings are designed as air bearings. In this case, neither exact centering nor immobilization of the template to the desired extent can be obtained.

Der Erfindung liegt die Aufgabe zugrunde, die Vorrichtung der eingangs genannten Art so weiterzubilden, daß durch geeignete Ausbildung von Strömungswegen zwischen dem Trägerzylinder und dem Hohlzylinder letzterer einwandfrei auszentriert und völlig ruhiggestellt werden kann.The invention has for its object to develop the device of the type mentioned in such a way that by appropriate design of flow paths between the carrier cylinder and the hollow cylinder the latter can be properly centered and completely immobilized.

Die Lösung der gestellten Aufgabe ist im kennzeichnenden Teil des Patentanspruchs 1 angegeben. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.The solution to the problem is specified in the characterizing part of claim 1. Advantageous developments of the invention can be found in the subclaims.

Eine Vorrichtung zum formstabilen Aufspannen eines dünnwandigen Hohlzylinders, mit einem um seine Zylinderachse drehbaren, hohlen Trägerzylinder, über den der Hohlzylinder schiebbar ist, zeichnet sich erfindungsgemäß dadurch aus, daß in der Zylinderwand des Trägerzylinders eine Vielzahl von Durchgangsöffnungen vorhanden ist, die sowohl in Längs- als auch in Umfangsrichtung des Trägerzylinders verteilt angeordnet sind, der Außendurchmesser des Trägerzylinders so gewählt ist, daß der Hohlzylinder mit nur geringem Spiel unmittelbar auf ihm zu liegen kommt, und durch die Durchgangsöffnungen des Trägerzylinders von innen nach außen ein unter Überdruck stehendes Fluid strömt.A device for dimensionally stable clamping of a thin-walled hollow cylinder, with a hollow support cylinder that can be rotated about its cylinder axis and over which the hollow cylinder can be pushed, is characterized according to the invention in that there are a large number of through openings in the cylinder wall of the support cylinder, both in longitudinal as well as distributed in the circumferential direction of the carrier cylinder are, the outer diameter of the support cylinder is selected so that the hollow cylinder comes to rest on it with only a slight play, and a fluid under pressure flows through the through openings of the support cylinder from the inside to the outside.

Der Trägerzylinder und der Hohlzylinder sind so ausgebildet, daß zwischen dem Innendurchmesser des Hohlzylinders und dem Außendurchmesser des Trägerzylinders nur ein sehr geringes Spiel vorhanden ist, das beispielsweise nur wenige hundertstel bis zehntel Millimeter beträgt. Das aus den Durchgangsöffnungen des Trägerzylinders ausströmende Fluid bewirkt daher eine sehr genaue Auszentrierung des Hohlzylinders auf dem Trägerzylinder. Diese Zentrierung bleibt auch dann erhalten, wenn ein Großteil der musterbedingt freizulegenden Öffnungen im Hohlzylinder schon vorhanden sind und aus diesen das Fluid ausströmen kann. Die sich im Ringraum zwischen Trägerzylinder und Hohlzylinder ausbildende Strömung ruft eine außerordentlich gute Zentrierung und starke Bedämpfung der ansonsten unvermeidbaren Schwingungen des Hohlzylinders relativ zum Trägerzylinder hervor, wie anhand der Kontrolle von Mustern festgestellt wurde, die mit Hilfe von so hergestellten Druckschablonen erzeugt wurden.The carrier cylinder and the hollow cylinder are designed so that there is only a very slight play between the inner diameter of the hollow cylinder and the outer diameter of the carrier cylinder, which is for example only a few hundredths to tenths of a millimeter. The fluid flowing out of the through openings of the carrier cylinder therefore causes the hollow cylinder to be centered very precisely on the carrier cylinder. This centering is retained even if a large part of the openings to be exposed due to the pattern are already present in the hollow cylinder and the fluid can flow out of them. The flow that forms in the annular space between the carrier cylinder and the hollow cylinder causes an extraordinarily good centering and strong damping of the otherwise unavoidable vibrations of the hollow cylinder relative to the carrier cylinder, as was determined on the basis of the control of patterns which were produced with the aid of printing stencils produced in this way.

Nach einer vorteilhaften Ausgestaltung der Erfindung sind die Durchgangsöffnungen sowohl in Längs- als auch in Umfangsrichtung des Trägerzylinders gleichmäßig verteilt angeordnet. Dies erleichtert die Herstellung des Trägerzylinders. Die Verteilung der Durchgangsöffnungen in Längsrichtung des Trägerzylinders kann sich aber auch nach einer vorgegebenen Funktion ändern, um auf diese Weise Abschnitte des Hohlzylinders, die zu stärkeren Schwingungen neigen, besser auszentrieren bzw. bedämpfen zu können. Mit anderen Worten kann in denjenigen Bereichen, in denen größere Schwingungen (Schwingungsbäuche) des Hohlzylinders zu erwarten sind, eine größere Dichte von Durchgangsöffnungen vorhanden sein als in denjenigen Bereichen, in denen Schwingungen des Hohlzylinders nicht so stark auftreten. Statt der Dichte der Durchgangsöffnungen kann in entsprechender Weise auch die Größe der Durchgangsöffnungen gewählt werden, um denselben Zweck zu erzielen. Vorzugsweise sind die Durchgangsöffnungen im wesentlichen im gesamten vom Hohlzylinder abgedeckten Bereich des Trägerzylinders vorhanden, um auch die Endbereiche des Hohlzylinders zentrieren bzw. bedämpfen zu können, so daß sich der Hohlzylinder möglichst über dessen gesamte Länge zur Bildung eines Musters heranziehen läßt. Durch eine Neigung der Durchgangsöffnungen bei größerer Wandstärke des Trägerzylinders vorzugsweise in Längsrichtung seiner Zylinderachse läßt sich der Dämpfungseffekt noch weiter verbessern. In diesem Fall kann die Wandstärke des Trägerzylinders im Millimeterbereich liegen. Verzichtet man auf die Schrägstellung der Durchgangsöffnungen, kann die Wandstärke dagegen im Bereich von 0,15 bis 0,5 mm liegen, so daß sich galvanoplastisch herstellbare Trägerzylinder verwenden lassen, die äußerst kostengünstig herstellbar sind.According to an advantageous embodiment of the invention, the through openings are arranged uniformly distributed both in the longitudinal and in the circumferential direction of the carrier cylinder. This facilitates the manufacture of the carrier cylinder. The distribution of the through openings in the longitudinal direction of the carrier cylinder can, however, also change according to a predetermined function in order in this way to better center or dampen sections of the hollow cylinder which tend to vibrate more strongly. In other words, in those areas in which larger vibrations (antinodes) of the hollow cylinder are to be expected, there may be a greater density of through openings than in those areas in which vibrations of the hollow cylinder do not occur as strongly. Instead of the density of the through openings, the size of the through openings can also be correspondingly can be chosen to achieve the same purpose. The through openings are preferably present essentially in the entire area of the carrier cylinder covered by the hollow cylinder, so that the end regions of the hollow cylinder can also be centered or damped, so that the hollow cylinder can be used over its entire length to form a pattern, if possible. The damping effect can be further improved by inclining the through openings with a greater wall thickness of the carrier cylinder, preferably in the longitudinal direction of its cylinder axis. In this case, the wall thickness of the carrier cylinder can be in the millimeter range. If the inclined position of the through openings is dispensed with, the wall thickness, on the other hand, can be in the range from 0.15 to 0.5 mm, so that support cylinders which can be produced by electroplating can be used, which can be produced at extremely low cost.

Nach einer Weiterbildung der Erfindung ist der Trägerzylinder an seinen beiden Stirnseiten durch ihn aufnehmende, drehbar gelagerte Zentrierzylinder abgeschlossen, von denen wenigstens einer einen koaxial verlaufenden Durchgangskanal aufweist. Durch den Durchgangskanal strömt das Fluid ins Innere des Trägerzylinders und dann über dessen Durchgangsöffnungen in den Ringraum zwischen Hohlzylinder und Trägerzylinder hinein. Sind beide Zentrierzylinder mit koaxial verlaufenden Durchgangskanälen versehen, so läßt sich eine noch gleichmäßigere Druckverteilung im Inneren des Trägerzylinders und damit auch im Ringraum zwischen Hohlzylinder und Trägerzylinder erzielen.According to a further development of the invention, the carrier cylinder is closed on its two end faces by rotatably mounted centering cylinders which receive it, at least one of which has a coaxial through-channel. The fluid flows through the through-channel into the interior of the carrier cylinder and then through its through-openings into the annular space between the hollow cylinder and the carrier cylinder. If both centering cylinders are provided with coaxial through-channels, an even distribution of pressure can be achieved inside the carrier cylinder and thus also in the annular space between the hollow cylinder and carrier cylinder.

Einer der Zentrierzylinder ist mit einem Drehantrieb gekoppelt, um den Trägerzylinder in Drehung zu versetzen. Dabei kann der Trägerzylinder mit beiden Zentrierzylindern fest verbunden sein und eine Einheit bilden.One of the centering cylinders is coupled to a rotary drive in order to set the carrier cylinder in rotation. The carrier cylinder can be firmly connected to both centering cylinders and form a unit.

Der Trägerzylinder selbst kann z. B. aus Metall bestehen, so daß er außerordentlich formstabil ist. Er kann aber auch aus Kunststoff hergestellt sein, wenn die Wanddicke entsprechend gewählt ist. Auch in diesem Fall läßt sich eine ausreichende Formstabilität erzielen.The carrier cylinder itself can, for. B. consist of metal, so that it is extremely dimensionally stable. But it can also be made of plastic if the wall thickness is chosen accordingly. Sufficient dimensional stability can also be achieved in this case.

Nach einer anderen vorteilhaften Weiterbildung weist der mit dem Drehantrieb gekoppelte Zentrierzylinder eine kegelförmige Erweiterung auf, auf die eine Stirnseite des Hohlzylinders aufschiebbar ist. Über diese kegelförmige Erweiterung kann eine gewisse Vorzentrierung des Hohlzylinders erfolgen, wodurch sich die Ergebnisse hinsichtlich der Auszentrierung und Bedämpfung noch weiter verbessern lassen.According to another advantageous development, the centering cylinder coupled to the rotary drive has a conical extension onto which an end face of the hollow cylinder can be pushed. A certain pre-centering of the hollow cylinder can take place via this conical extension, whereby the results with regard to centering and damping can be improved even further.

Der nicht mit dem Drehantrieb gekoppelte Zentrierzylinder ist als mitlaufender Zentrierzylinder ausgebildet und wird von einer Reitstockkörnerspitze gehalten. Hierbei können der mitlaufende Zentrierzylinder und die Reitstockkörnerspitze jeweils mit zentralen Durchgangskanälen versehen sein, die in Längsrichtung dieser Elemente verlaufen und miteinander verbunden sind. Über diese Durchgangskanäle läßt sich das Innere des Trägerzylinders ebenfalls mit dem unter Druck stehenden Fluid versorgen.The centering cylinder, which is not coupled to the rotary drive, is designed as a rotating centering cylinder and is held by a tailstock center point. The centering cylinder and the tailstock center tip can each be provided with central through-channels which run in the longitudinal direction of these elements and are connected to one another. The interior of the carrier cylinder can also be supplied with the pressurized fluid via these through-channels.

Die Reitstockkörnerspitze ist nach einer Weiterbildung der Erfindung samt Reitstock entfernbar bzw. im entsprechenden Trägerbett absenkbar gelagert, um den Hohlzylinder auf den Trägerzylinder aufschieben bzw. von diesem abnehmen zu können.According to a further development of the invention, the tailstock center point can be removed, including the tailstock, or can be lowered in the corresponding carrier bed, so that the hollow cylinder can be pushed onto or removed from the carrier cylinder.

Mittels einer Gebläse- oder Luftkompressionseinrichtung wird Luft durch die genannten Durchgangskanäle ins Innere des Trägerzylinders geblasen, wobei für jede Seite des Trägerzylinders eine getrennte Gebläse- oder Luftkompressionseinrichtung vorhanden sein kann. Für beide Seiten kann aber auch eine gemeinsame Einrichtung verwendet werden. Die Gebläse-bzw. Luftkompressionseinrichtungen befinden sich vorzugsweise unterhalb eines den Trägerzylinder tragenden Bettes, um eine möglichst kompakte Vorrichtung zu erhalten.By means of a blower or air compression device, air is blown through said through-channels into the interior of the carrier cylinder, wherein a separate blower or air compression device can be provided for each side of the carrier cylinder. A common facility can also be used for both sides. The blower or. Air compression devices are preferably located below a bed carrying the carrier cylinder in order to obtain the most compact possible device.

Nach einer vorteilhaften Ausgestaltung der Erfindung ist eine Einrichtung zum Fixieren des Hohlzylinders relativ zum Trägerzylinder vorhanden. Hierdurch wird sichergestellt, daß sich der Hohlzylinder nicht in Umfangsrichtung oder in Axialrichtung des Trägerzylinders verschieben kann. Darüber hinaus kann eine Einrichtung zur Abdichtung eines Spalts zwischen Hohlzylinder und Trägerzylinder an einer Stirnseite des Hohlzylinders vorhanden sein, vorzugsweise dort, wo der Hohlzylinder mit seiner Stirnseite auf der kegelförmigen Erweiterung liegt. Zur Fixierung des Hohlzylinders am Tägerzylinder und zur Abdichtung des Spalts zwischen Hohlzylinder und Trägerzylinder kann z. B. ein Klebeband verwendet werden. Die andere Stirnseite des Hohlzylinders bleibt unbefestigt. Hier wird der Spalt zwischen Hohlzylinder und Trägerzylinder nicht abgedichtet. Als Fixiereinrichtung können aber auch ein geschlitzter, kegelförmiger Ring auf die Erweiterung aufgesetzt oder Spannklemmen, etc., verwendet werden.According to an advantageous embodiment of the invention, a device for fixing the hollow cylinder relative to the carrier cylinder is provided. This ensures that the hollow cylinder cannot move in the circumferential direction or in the axial direction of the carrier cylinder. In addition, a device for sealing a gap be present between the hollow cylinder and carrier cylinder on one end face of the hollow cylinder, preferably where the end face of the hollow cylinder lies on the conical extension. For fixing the hollow cylinder to the carrier cylinder and for sealing the gap between the hollow cylinder and carrier cylinder, for. B. an adhesive tape can be used. The other end of the hollow cylinder remains unsecured. Here the gap between the hollow cylinder and the carrier cylinder is not sealed. A slotted, conical ring can also be placed on the extension or tension clamps, etc., can be used as the fixing device.

Die Vorrichtung wird vorzugsweise zum formstabilen Aufspannen von Siebdruckzylindern für die photomechanische Dessinierung verwendet. Diese Siebdruckzylinder kommen hauptsächlich im Bereich der Textildrucktechnik zum Einsatz, können aber auch zum Bedrucken anderer Materialien verwendet werden.The device is preferably used for dimensionally stable clamping of screen printing cylinders for photomechanical design. These screen printing cylinders are mainly used in the field of textile printing technology, but can also be used for printing on other materials.

Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher beschrieben. Es zeigen:

  • Figur 1 einen Längsschnitt durch eine Gravurvorrichtung mit eingespanntem Trägerzylinder und darauf liegendem Hohlzylinder,
  • Figur 2 einen Längsschnitt durch den vergrößert dargestellten Trägerzylinder mit darauf liegendem Hohlzylinder, und
  • Figur 3 einen Schnitt durch die Gravurvorrichtung im Bereich von Träger-und Hohlzylinder.
The invention is described in more detail below with reference to the drawing. Show it:
  • FIG. 1 shows a longitudinal section through an engraving device with a clamped carrier cylinder and a hollow cylinder lying thereon,
  • Figure 2 shows a longitudinal section through the carrier cylinder shown enlarged with a hollow cylinder lying thereon, and
  • 3 shows a section through the engraving device in the region of the carrier and hollow cylinder.

Die Gravurvorrichtung gemäß den Figuren 1 und 3 besteht aus einem biegesteifen Maschinenbett 1, das auf zwei Säulen 2 und 3 montiert ist. Auf dem Maschinenbett 1 befinden sich ein Spindelstock 4 und ein im Abstand zu ihm angeordneter Reitstock 5. Am Reitstock 5 ist in Richtung auf den Spindelstock 4 weisend eine Reitstockkörnerspitze 6 drehbar gelagert. Zwischen dem Spindelstock 4 und der Reitstockkörnerspitze 6 ist ein Trägerzylinder 7 drehbar gehalten, und zwar über stirnseitige Zentrierzylinder 8 und 9. Die Zentrierzylinder 8 und 9 ragen jeweils zu einem geringen Teil in den Trägerzylinder 7 stirnseitig hinein und können mit diesem fest verbunden sein. Der Trägerzylinder und die Zentrierzylinder 8 und 9 können somit eine Baueinheit bilden.The engraving device according to Figures 1 and 3 consists of a rigid machine bed 1, which is mounted on two columns 2 and 3. On the machine bed 1 there are a headstock 4 and a tailstock 5 arranged at a distance from it. On the tailstock 5, a tailstock center point 6 is rotatably mounted pointing in the direction of the headstock 4. A carrier cylinder 7 is rotatably held between the headstock 4 and the tailstock center point 6, specifically via the centering cylinder on the end face 8 and 9. The centering cylinders 8 and 9 each project to a small extent into the front of the carrier cylinder 7 and can be firmly connected to the latter. The carrier cylinder and the centering cylinders 8 and 9 can thus form a structural unit.

Der Zentrierzylinder 8 ist mit seiner freien Stirnseite in den Spindelstock 4 einsetzbar und dort drehbar gelagert. Ein im Spindelstock 4 vorhandener und nicht dargestellter Antrieb dient dazu, den Zentrierzylinder 8 und mit ihm den Trägerzylinder 7 in Rotation zu versetzen. Der reitstockseitige Zentrierzylinder 9 ist an seiner freien Stirnseite mit einer zentralen Ausnehmung zur Aufnahme der Reitstockkörnerspitze 6 versehen. Mit anderen Worten läßt sich die aus den Zentrierzylindern 8 und 9 und dem Trägerzylinder 7 bestehende Baueinheit zwischen dem Spindelstock 4 und dem Reitstock 5 um ihre Längs- bzw. Zylinderachse drehen, die parallel zur Längsrichtung des Bettes 1 verläuft. Parallel dazu kann auch der Reitstock 5 verschoben werden, um die Reitstockkörnerspitze 6 in die Ausnehmung an der freien Stirnseite des Zentrierzylinders 9 einführen zu können. Darüber hinaus läßt sich der Reitstock 5 entweder vom Maschinenbett 1 abnehmen oder in dieses versenken, und zwar so weit, daß auf den Trägerzylinder 7 ein dünnwandiger Hohlzylinder 10 aufgeschoben werden kann, wie noch erläutert wird. Zu diesem Zweck überragt die Umfangsseite des Zentrierzylinders 9 die Mantelfläche des Trägerzylinders 7 nicht. Am spindelstockseitigen Ende des Zentrierzylinders 8 kann dieser allerdings in Richtung zum Spindelstock 4 mit einer kegelförmigen Erweiterung 11 versehen sein, auf die der Hohlzylinder 10 mit seiner einen Stirnseite aufgeschoben wird.The centering cylinder 8 can be inserted with its free end face into the headstock 4 and is rotatably supported there. An existing and not shown drive in the headstock 4 serves to set the centering cylinder 8 and with it the carrier cylinder 7 in rotation. The tailstock-side centering cylinder 9 is provided on its free end face with a central recess for receiving the tailstock center tip 6. In other words, the unit consisting of the centering cylinders 8 and 9 and the carrier cylinder 7 can be rotated between the headstock 4 and the tailstock 5 about their longitudinal or cylindrical axis, which runs parallel to the longitudinal direction of the bed 1. In parallel, the tailstock 5 can also be displaced in order to be able to insert the tailstock center point 6 into the recess on the free end face of the centering cylinder 9. In addition, the tailstock 5 can either be removed from the machine bed 1 or sunk into it, to the extent that a thin-walled hollow cylinder 10 can be pushed onto the carrier cylinder 7, as will be explained. For this purpose, the circumferential side of the centering cylinder 9 does not protrude beyond the lateral surface of the carrier cylinder 7. At the headstock end of the centering cylinder 8, however, this can be provided in the direction of the headstock 4 with a conical extension 11 onto which the hollow cylinder 10 is pushed with its one end face.

Sowohl der Zentrierzylinder 8 als auch der Zentrierzylinder 9 und die Reitstockkörnerspitze 6 sind mit zentralen Durchgangsbohrungen 12, 13 und 14 versehen, wobei die Durchgangsbohrungen 13 und 14 miteinander verbunden sind. Über Rohrleitungen oder flexible Schläuche 15 und 16 stehen die Durchgangsbohrungen 12 und 14 jeweils mit einer Gebläseeinheit 17, 18 in Verbindung. Diese Gebläseeinheiten 17, 18 befinden sich innerhalb des Maschinenbetts 1 und können z. B. Ringkammergebläse sein, die Drücke bis zu etwa 1,0 bar bei entsprechend großer Fördermenge erzeugen können. Anstelle der verwendeten Ringkammergebläse können auch sogenannte Roots-Blower zur Erzeugung der notwendigen Druckluft vorgesehen sein.Both the centering cylinder 8 and the centering cylinder 9 and the tailstock center point 6 are provided with central through bores 12, 13 and 14, the through bores 13 and 14 being connected to one another. The through bores 12 and 14 are each connected to a blower unit 17, 18 via pipes or flexible hoses 15 and 16. These blower units 17, 18 are located within the machine bed 1 and can, for. B. annular chamber blower, the Can generate pressures of up to about 1.0 bar with a correspondingly large delivery rate. Instead of the annular chamber blowers used, so-called roots blowers can also be provided to generate the necessary compressed air.

Der Trägerzylinder 7 ist mit kleinen und radial verlaufenden Durchgangsöffnungen 19 versehen, aus welchen Luft ausströmen kann. Diese Luft steht im Innern des Trägerzylinders 7 unter einem Überdruck von etwa 0,1 bis 1,0 bar. Die Durchgangsöffnungen 19 sind gleichmäßig sowohl in Umfangsrichtung als auch Längsrichtung des Trägerzylinders 7 verteilt angeordnet, und zwar über die gesamte Länge des Trägerzylinders 7, und weisen z. B. Durchmesser von 0,2 bis 0,5 mm auf. Ihr Abstand in Längsrichtung des Trägerzylinders 7 beträgt etwa 500 mm, während in Umfangsrichtung des Trägerzylinders 7 ein gegenseitiger Abstand von etwa 80 mm vorgesehen ist. Der Trägerzylinder 7 selbst kann einen Durchmesser von mehreren zehn Zentimetern und eine Länge von mehreren Metern aufweisen. Er kann durch die im Spindelstock 4 vorhandene Antriebseinrichtung mit ca. 600 bis 1200 Umdrehungen pro Minute gedreht werden.The carrier cylinder 7 is provided with small and radially extending through openings 19 from which air can flow out. This air is inside the carrier cylinder 7 under an overpressure of about 0.1 to 1.0 bar. The through openings 19 are arranged evenly distributed both in the circumferential direction and in the longitudinal direction of the carrier cylinder 7, namely over the entire length of the carrier cylinder 7, and z. B. diameter from 0.2 to 0.5 mm. Their distance in the longitudinal direction of the carrier cylinder 7 is approximately 500 mm, while a mutual distance of approximately 80 mm is provided in the circumferential direction of the carrier cylinder 7. The carrier cylinder 7 itself can have a diameter of several tens of centimeters and a length of several meters. It can be rotated at approx. 600 to 1200 revolutions per minute by the drive device in the headstock 4.

Wie anhand der Figur 2 zu erkennen ist, liegt der Hohlzylinder 10 mit nur geringem Spiel auf dem Trägerzylinder 7 auf. Die Dicke des Ringspalts zwischen dem Innendurchmesser des Hohlzylinders 10 und dem Außendurchmesser des Trägerzylinders 7 liegt beispielsweise bei nur einigen hundertstel bis zehntel Millimetern, z. B. bei 0,04 mm.As can be seen from FIG. 2, the hollow cylinder 10 rests on the carrier cylinder 7 with only slight play. The thickness of the annular gap between the inner diameter of the hollow cylinder 10 and the outer diameter of the carrier cylinder 7 is, for example, only a few hundredths to tenths of a millimeter, e.g. B. at 0.04 mm.

Wird der Reitstock 5 in die in Figur 1 dargestellte Position 20 abgesenkt, so läßt sich der Hohlzylinder 10 auf den Trägerzylinder 7 und über den Zentrierzylinder 9 hinweg aufschieben. Dabei wird der Hohlzylinder 10 so weit über den Trägerzylinder 7 geschoben, bis die aufgesetzte Stirnseite des Hohlzylinders 10 auf die kegelförmige Erweiterung 11 des Zentrierzylinders 8 aufläuft. Vorzugsweise weist der Hohlzylinder 10 dieselbe axiale Länge wie der Trägerzylinder 7 auf, so daß das andere stirnseitige Ende des Hohlzylinders 10 dann im Bereich des anderen Zentrierzylinders 9 zu liegen kommt. Der Hohlzylinder 10 wird sodann im Bereich der kegelförmigen Erweiterung 11 am Zentrierzylinder 8 fixiert, beispielsweise durch ein in Umfangsrichtung aufgeklebtes Klebeband 21 (Fixiereinrichtung). Dieses Klebeband 21 kann auch eine dichtende Funktion haben, um den noch vorhandenen Spalt zwischen dem Hohlzylinder 10 und der kegelförmigen Erweiterung 11 abzudichten. Das andere Ende des Hohlzylinders 10 bleibt unbefestigt bzw. frei.If the tailstock 5 is lowered into the position 20 shown in FIG. 1, the hollow cylinder 10 can be pushed onto the carrier cylinder 7 and over the centering cylinder 9. The hollow cylinder 10 is pushed so far over the carrier cylinder 7 until the end face of the hollow cylinder 10 that is attached runs onto the conical extension 11 of the centering cylinder 8. The hollow cylinder 10 preferably has the same axial length as the carrier cylinder 7, so that the other end of the hollow cylinder 10 then comes to rest in the region of the other centering cylinder 9. The hollow cylinder 10 is then in the region of the conical Extension 11 fixed to the centering cylinder 8, for example by means of an adhesive tape 21 which is glued on in the circumferential direction (fixing device). This adhesive tape 21 can also have a sealing function in order to seal the gap that still exists between the hollow cylinder 10 and the conical extension 11. The other end of the hollow cylinder 10 remains unsecured or free.

Wird der Trägerzylinder 7 mit der gewünschten Drehzahl gedreht, und wird gleichzeitig unter Druck stehende Luft mit Hilfe der Gebläseeinheiten 17 und 18 ins Innere 22 des Trägerzylinders 7 geblasen, so bildet sich in dem von Trägerzylinder 7 und Hohlzylinder 10 gebildeten dünnen Ringraum ein strömendes Luftpolster aus, das hervorragende zentrierende und schwingungsdämpfende Eigenschaften aufweist. Sehr gute Ergebnisse wurden bei einem Druck von etwa 0,5 bar erzielt.If the carrier cylinder 7 is rotated at the desired speed, and at the same time pressurized air is blown into the interior 22 of the carrier cylinder 7 with the aid of the blower units 17 and 18, a flowing air cushion forms in the thin annular space formed by the carrier cylinder 7 and the hollow cylinder 10 , which has excellent centering and vibration damping properties. Very good results were achieved at a pressure of approximately 0.5 bar.

In diesem Zustand läßt sich der auf dem Trägerzylinder liegenden Hohlzylinder 10 gravieren bzw. mit fokussierter Strahlung (S) beaufschlagen. Hierzu läuft ein Schlitten 23 auf Führungen 24 und 25, die sich parallel zur Längsachse des Trägerzylinders 7 erstrecken. Eine der Führungen 25 ist als Spindel ausgebildet, die von einem Schrittmotor 26 angetrieben wird. Der Schlitten 23 kann daher bei Drehung der Spindel 25 parallel zur Längsrichtung des Trägerzylinders 7 bewegt bzw. verschoben werden. Dieser Schlitten 23 nimmt eine nicht dargestellte Gravureinrichtung auf. Letztere kann aus einem Umlenkspiegel mit einer fokussierenden Optik 26 bestehen oder unmittelbar aus einem kleinen Festkörperlaser mit einem Linsensystem, welches den Laserstrahl auf die Zylindermanteloberfläche des Hohlzylinders 10 fokussiert. Die zuerst genannte Belichtungsmöglichkeit geht beispielsweise schon aus der eingangs genannten DE-OS 36 01 327 hervor.In this state, the hollow cylinder 10 lying on the carrier cylinder can be engraved or subjected to focused radiation (S). For this purpose, a carriage 23 runs on guides 24 and 25, which extend parallel to the longitudinal axis of the carrier cylinder 7. One of the guides 25 is designed as a spindle, which is driven by a stepper motor 26. The carriage 23 can therefore be moved or displaced parallel to the longitudinal direction of the carrier cylinder 7 when the spindle 25 rotates. This carriage 23 receives an engraving device, not shown. The latter can consist of a deflecting mirror with focusing optics 26 or directly from a small solid-state laser with a lens system which focuses the laser beam onto the surface of the cylinder jacket of the hollow cylinder 10. The first-mentioned exposure option is already apparent, for example, from DE-OS 36 01 327 mentioned at the beginning.

Claims (15)

  1. Device for the dimensionally stable mounting of a thin-walled hollow cylinder (10), having a hollow carrier cylinder (7) which can be rotated about its cylinder axis and over which the hollow cylinder (10) can be pushed, characterized in that
    - there are present in the cylinder wall of the carrier cylinder (7) a multiplicity of passage openings (19) which are arranged distributed both in the longitudinal direction and in the circumferential direction of the carrier cylinder (7),
    - the external diameter of the carrier cylinder (7) is selected such that the hollow cylinder (10) comes to rest directly upon it with only little play, and
    - the passage openings (19) of the carrier cylinder (7) are flowed through from the inside to the outside by a fluid which is under a superatmospheric pressure.
  2. Device according to Claim 1, characterized in that the passage openings (19) are arranged distributed uniformly both in the longitudinal direction and in the circumferential direction of the carrier cylinder (7).
  3. Device according to Claim 1, characterized in that the distribution of the passage openings (19) changes in the longitudinal direction of the carrier cylinder (7) in accordance with a predetermined function.
  4. Device according to Claim 1, 2 or 3, characterized in that the passage openings (19) are arranged essentially in the whole region of the carrier cylinder (7) which is covered by the hollow cylinder (10).
  5. Device according to Claim 1, 2, 3 or 4, characterized in that the passage openings (19) penetrate the cylinder wall of the carrier cylinder (7) radially or running obliquely.
  6. Device according to one of Claims 1 to 5, characterized in that the carrier cylinder (7) is sealed at both its ends by centring cylinders (8, 9) which receive it and are rotatably mounted, and at least one of which has a passage duct (12, 13) running coaxially.
  7. Device according to Claim 6, characterized in that one of the centring cylinders (8) is coupled to a rotary drive.
  8. Device according to Claim 6 or 7, characterized in that the centring cylinder (8) which is coupled to the rotary drive has a conical widening (11) onto which one end of the hollow cylinder (10) can be pushed.
  9. Device according to Claims 6 and 7, characterized in that the concomitantly running centring cylinder (9) is held by a tailstock centre (6) and both apparatuses (9, 6) have central passage ducts (13, 14) running in the longitudinal direction and connected to each other.
  10. Device according to Claim 8 or 9, characterized in that the tailstock centre (6) and tailstock (5) can be removed or lowered.
  11. Device according to one of Claims 6 to 10, characterized in that a blower apparatus or air compression apparatus (17, 18) is connected to the passage ducts (12, 13, 14).
  12. Device according to one of Claims 1 to 11, characterized by an apparatus (21) for fixing the hollow cylinder (10) in relation to the carrier cylinder (7).
  13. Device according to one of Claims 1 to 12, characterized by an apparatus (21) for sealing a gap between hollow cylinder (10) and carrier cylinder (7) at one end of the hollow cylinder (10).
  14. Device according to one of Claims 1 to 13, characterized in that an annular gap which is present between carrier cylinder (7) and hollow cylinder (10) has a radial thickness which is preferably in the range from 0.02 to 0.3 mm.
  15. Use of the device according to one or more of Claims 1 to 14 for the dimensionally stable clamping of screen printing cylinders for photomechanical patterning.
EP93106913A 1993-04-28 1993-04-28 Device for rigidly fining a thin-walled hollow cylinder Expired - Lifetime EP0622190B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT93106913T ATE134928T1 (en) 1993-04-28 1993-04-28 DEVICE FOR Clamping a thin-walled hollow cylinder in a stable manner
EP93106913A EP0622190B1 (en) 1993-04-28 1993-04-28 Device for rigidly fining a thin-walled hollow cylinder
DE59301804T DE59301804D1 (en) 1993-04-28 1993-04-28 Device for dimensionally stable clamping of a thin-walled hollow cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93106913A EP0622190B1 (en) 1993-04-28 1993-04-28 Device for rigidly fining a thin-walled hollow cylinder

Publications (2)

Publication Number Publication Date
EP0622190A1 EP0622190A1 (en) 1994-11-02
EP0622190B1 true EP0622190B1 (en) 1996-03-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106913A Expired - Lifetime EP0622190B1 (en) 1993-04-28 1993-04-28 Device for rigidly fining a thin-walled hollow cylinder

Country Status (3)

Country Link
EP (1) EP0622190B1 (en)
AT (1) ATE134928T1 (en)
DE (1) DE59301804D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH690030A5 (en) * 1995-01-26 2000-03-31 Fingraf Ag Method and apparatus for producing a stencil printing sheet.
CN101804719B (en) * 2010-03-25 2012-01-04 浙江博玛数码电子有限公司 Vibration-adsorption structure of carving knife of digital wide-width electronic carving machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144812A (en) * 1975-01-08 1979-03-20 Strachan & Henshaw Limited Printing sleeves
NL8401401A (en) * 1984-05-02 1985-12-02 Stork Screens Bv METHOD AND APPARATUS FOR THE MANUFACTURE OF A GRID ROLLER
GB8727613D0 (en) * 1987-11-25 1987-12-31 Zed Instr Ltd Moving support
NL8800354A (en) * 1988-02-12 1989-09-01 Kufstein Schablonentech Gmbh TENSIONING ROLLERS AND APPARATUS EQUIPPED WITH SUCH TENSIONING ROLLERS.

Also Published As

Publication number Publication date
DE59301804D1 (en) 1996-04-11
ATE134928T1 (en) 1996-03-15
EP0622190A1 (en) 1994-11-02

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