EP0622190A1 - Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces - Google Patents

Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces Download PDF

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Publication number
EP0622190A1
EP0622190A1 EP93106913A EP93106913A EP0622190A1 EP 0622190 A1 EP0622190 A1 EP 0622190A1 EP 93106913 A EP93106913 A EP 93106913A EP 93106913 A EP93106913 A EP 93106913A EP 0622190 A1 EP0622190 A1 EP 0622190A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
carrier
hollow cylinder
hollow
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93106913A
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German (de)
English (en)
Other versions
EP0622190B1 (fr
Inventor
Erwin Suchan
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.)
Schablonentechnik Kufstein GmbH
Original Assignee
Schablonentechnik Kufstein 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 Schablonentechnik Kufstein GmbH filed Critical Schablonentechnik Kufstein GmbH
Priority to EP93106913A priority Critical patent/EP0622190B1/fr
Priority to DE59301804T priority patent/DE59301804D1/de
Priority to AT93106913T priority patent/ATE134928T1/de
Publication of EP0622190A1 publication Critical patent/EP0622190A1/fr
Application granted granted Critical
Publication of EP0622190B1 publication Critical patent/EP0622190B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 carrier 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 carrier 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, a greater density of through openings can be present 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 towards 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 tip 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 front 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.
EP93106913A 1993-04-28 1993-04-28 Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces Expired - Lifetime EP0622190B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP93106913A EP0622190B1 (fr) 1993-04-28 1993-04-28 Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces
DE59301804T DE59301804D1 (de) 1993-04-28 1993-04-28 Vorrichtung zum formstabilen Aufspannen eines dünnwandigen Hohlzylinders
AT93106913T ATE134928T1 (de) 1993-04-28 1993-04-28 Vorrichtung zum formstabilen aufspannen eines dünnwandigen hohlzylinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93106913A EP0622190B1 (fr) 1993-04-28 1993-04-28 Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces

Publications (2)

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

Family

ID=8212844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106913A Expired - Lifetime EP0622190B1 (fr) 1993-04-28 1993-04-28 Dispositif pour fixer d'une manière rigide un cylindre creux à parois minces

Country Status (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0733951A2 (fr) * 1995-01-26 1996-09-25 Lüscher, Ursula Procédé et appareil pour la fabrication d'un écran sérigraphique
CN101804719A (zh) * 2010-03-25 2010-08-18 浙江博玛数码电子有限公司 数字式宽幅电子雕刻机雕刻刀的减振结构

Citations (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
EP0160341A1 (fr) * 1984-05-02 1985-11-06 Stork Screens B.V. Procédé et dispositif de fabrication d'un rouleau tramé
EP0320137A1 (fr) * 1987-11-25 1989-06-14 Zed Instruments Limited Appareil pour la gravure au laser pour la fabrication d'écrans sérigraphiques cylindriques
EP0329217A1 (fr) * 1988-02-12 1989-08-23 Schablonentechnik Kufstein Gesellschaft M.B.H. Rouleau tendeur et dispositif avec un tel rouleau

Patent Citations (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
EP0160341A1 (fr) * 1984-05-02 1985-11-06 Stork Screens B.V. Procédé et dispositif de fabrication d'un rouleau tramé
EP0320137A1 (fr) * 1987-11-25 1989-06-14 Zed Instruments Limited Appareil pour la gravure au laser pour la fabrication d'écrans sérigraphiques cylindriques
EP0329217A1 (fr) * 1988-02-12 1989-08-23 Schablonentechnik Kufstein Gesellschaft M.B.H. Rouleau tendeur et dispositif avec un tel rouleau

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0733951A2 (fr) * 1995-01-26 1996-09-25 Lüscher, Ursula Procédé et appareil pour la fabrication d'un écran sérigraphique
EP0733951B1 (fr) * 1995-01-26 1998-09-02 Lüscher, Ursula Procédé et appareil pour la fabrication d'un écran sérigraphique
CN101804719A (zh) * 2010-03-25 2010-08-18 浙江博玛数码电子有限公司 数字式宽幅电子雕刻机雕刻刀的减振结构
CN101804719B (zh) * 2010-03-25 2012-01-04 浙江博玛数码电子有限公司 数字式宽幅电子雕刻机雕刻刀的减振结构

Also Published As

Publication number Publication date
DE59301804D1 (de) 1996-04-11
EP0622190B1 (fr) 1996-03-06
ATE134928T1 (de) 1996-03-15

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