EP1150842A1 - Engraver - Google Patents

Engraver

Info

Publication number
EP1150842A1
EP1150842A1 EP99963198A EP99963198A EP1150842A1 EP 1150842 A1 EP1150842 A1 EP 1150842A1 EP 99963198 A EP99963198 A EP 99963198A EP 99963198 A EP99963198 A EP 99963198A EP 1150842 A1 EP1150842 A1 EP 1150842A1
Authority
EP
European Patent Office
Prior art keywords
engraving
stylus
shaft
element according
rotating system
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
EP99963198A
Other languages
German (de)
French (fr)
Other versions
EP1150842B1 (en
Inventor
Dieter Carstens
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.)
Hell Gravure Systems GmbH and Co KG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1150842A1 publication Critical patent/EP1150842A1/en
Application granted granted Critical
Publication of EP1150842B1 publication Critical patent/EP1150842B1/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
    • 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
    • B41C1/045—Mechanical engraving heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y10T82/125—Tool simultaneously moving axially
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y10T82/125—Tool simultaneously moving axially
    • Y10T82/128—Pivoted to tool-carrier

Definitions

  • the invention relates to the field of electronic reproduction technology and relates to an engraving member of an electronic engraving machine for engraving printing cylinders for gravure printing.
  • an engraving element with an engraving stylus as a cutting tool moves in the axial direction along a rotating printing cylinder.
  • the engraving stylus which is controlled by an engraving control signal, cuts wells arranged in engraving lines in an engraving grid into the outer surface of the printing cylinder.
  • the engraving control signal is formed by superimposing a periodic raster signal with image signal values which represent the tonal values to be reproduced between "black” and "white".
  • the screen signal causes the engraving stylus to vibrate in the direction of the printing cylinder, the image signal values determining the engraving depths of the cells in accordance with the tone values to be reproduced.
  • the electromagnetic drive element consists of a stationary electromagnet to which the engraving control signal is applied, in the air gap of which the armature of a rotating system moves.
  • the rotating system consists of a shaft, the armature, a bearing for the shaft and a damping device. One shaft end merges into a resilient torsion bar that is clamped in place, while the other shaft end carries a lever to which the engraving stylus is attached.
  • the engraving stylus is often a prismatic cut diamond, which is attached with its shaft to the lever of the engraving element.
  • the engraving stylus essentially consists of a front rake face with respect to the engraving direction and an oblique rear open face facing away from the rake face.
  • the intersection lines between the rake face and the free face form the cutting tip of the engraving stylus.
  • the angle between the sloping free surface and the tangential plane at the point of contact between the cutting tip and the lateral surface of the printing cylinder is referred to as the clearance angle.
  • the clearance angle of the engraving stylus limits the steepness with which the engraving stylus can penetrate the printing cylinder without the free surface touching the wall of the cups.
  • wells that are compressed in the direction of the engraving line are engraved with a steep wall and elongated wells are engraved with a flat wall.
  • the free surface of the engraving stylus touches the wall of the cells and the cutting process is interrupted. The result is that the engraving depths required for engraving with the correct tonal value are not reached and cups with an undesirable asymmetrical shape are engraved.
  • the invention is based on the object of improving an engraving element of an electronic engraving machine for engraving printing forms in such a way that engraving with the correct tone value is achieved in particular even with upset cells.
  • Fig. 1 shows the basic structure of an engraving element
  • Fig. 2 shows an engraving stylus and an impression cylinder (in sections) in cross section.
  • FIG. 1 shows a perspective illustration of the structure of an engraving element, which in principle has a drive system, in the example shown an electromagnetic drive system, and a rotary system.
  • the electromagnetic drive element consists of a stationary electromagnet (1) with two opposing u-shaped laminated cores (2) and two air gaps (3) between the legs of the laminated cores (2).
  • a coil (5) In the recesses (4) of the laminated core (2) of the electromagnet (1) there is a coil (5), of which only one side of the coil is shown. An engraving control signal flows through the coil (5).
  • the rotating system consists of a shaft (6), an armature (7) attached to the shaft (6), and a damping device (8) and a bearing (9) for the shaft (6).
  • the armature (7) can be moved in the air gaps (3) of the electromagnet (1).
  • One end of the shaft merges into a resilient torsion bar (10) which is clamped in a fixed support (11, 12).
  • the other shaft end (13) carries a lever (14) on which an engraving stylus (15) is attached, for example in the form of a diamond.
  • the damping device (8) and the bearing (9) are arranged between the armature (7) and the lever (14) with the engraving stylus (15).
  • the magnetic field generated in the air gaps (2) of the electromagnet (1) exerts an electrical torque on the armature (7) of the shaft (6), which counteracts the mechanical torque of the torsion bar (10).
  • the electrical torque rotates the shaft (6) about its longitudinal axis with one of the respective current engraving control signal value proportional angle of rotation from a rest position, and the torsion bar (10) brings the shaft (6) back to the rest position.
  • the rotation of the shaft (6) causes the engraving stylus (15) to perform a lifting movement in the direction of the lateral surface of a printing cylinder, not shown, which determines the depth of penetration of the engraving stylus (15) into the printing cylinder.
  • the drive system for the engraving stylus (15) can also be designed as a solid-state actuator element, which consists, for example, of a piezoelectric or a magnetostrictive material.
  • Fig. 2 shows a cross section through the engraving stylus and a pressure cylinder.
  • a radial partial cross section through a pressure cylinder (16) is shown in the area of its lateral surface (17).
  • the engraving stylus (15) which is designed as a prismatic cut diamond, is also shown in cross section.
  • the rotating printing cylinder (16) may move in the direction of an arrow (18) under the engraving stylus (15), an arrow (19) indicating the direction of engraving for the cups (20) on a circumferential engraving line on the lateral surface (17) of the printing cylinder (16) indicates.
  • the engraving stylus (15) essentially consists of a shaft (21), a rake face (22) which is at the front with respect to the engraving direction (19) and a free face (23) facing away from the rake face (22).
  • the cutting lines between the rake surface (22) and the free surface (23) form the cutting tip (24) of the engraving stylus (15).
  • the free surface (23) encloses the clearance angle ( ⁇ ) with a tangential surface in the point of contact of the cutting tip (24) and the outer surface (17) of the pressure cylinder (16).
  • the engraving element is aligned with the lateral surface (17) of the printing cylinder (16) in such a way that the engraving stylus (15) for engraving the cups (20) has a stroke movement, indicated by a double arrow (25), in the direction of the printing cylinder (16) and in Opposite direction.
  • the clearance angle ( ⁇ ) of the engraving stylus (15) is increased according to the invention in that the engraving stylus (15) in the engraving direction (19) relative to one each radially to the printing cylinder (16), ie perpendicularly is arranged inclined to the lateral surface (17), extending reference straight line (26).
  • the angle of inclination ( ⁇ ), which the inclined engraving stylus (15) includes with the reference straight line (26), is expediently chosen to be 1 ° to 5 °, preferably 3 °.
  • the tilting of the engraving stylus (15) with respect to the lateral surface (17) is achieved by a correspondingly tilted fastening, for example by gluing, of the engraving stylus (15) in the lever (14) of the engraving member.
  • the exact insertion of the engraving stylus (15) into the lever (14) is carried out, for example, by means of a mounting device according to DE-PS 22 13 768.
  • the tilting of the engraving stylus (15) is achieved by constructively inclining the longitudinal axis of the rotating system (6, 7, 8, 9) of the engraving member in relation to a reference tangent applied to the lateral surface (17) of the printing cylinder (16).

Abstract

The invention relates to an engraver of an electrical engraving machine for engraving pressure cylinders. The engraver consists of a rotating system (6, 8, 9, 10, 14) which oscillates around small angles. The engraver further consists of a drive system (1, 7) for the rotating system (6, 8, 9, 10, 14) and of a graver (15) that is arranged at the rotating system (6, 8, 9, 10, 14). The graver is used to grave cup-shapes (20) in the pressure cylinder (16) by carrying out a lifting movement directed at the pressure cylinder (16). The clearance angle (α) of the graver (15) is arranged in a tilt in the direction (19) of the engraving of the cup-shapes (20) in relation to a line of reference (26) which extends vertically to the generated surface (17) of the pressure cylinder (16). Said clearance angle (α) is thus enlarged. Especially buckled cup-shapes (20) can be engraved in the correct tone value using the tilted arrangement of the graver (15).

Description

Gravierorgan Engraving device
Die Erfindung bezieht sich auf das Gebiet der elektronischen Reproduktionstechnik und betrifft ein Gravierorgan einer elektronischen Graviermaschine zur Gravur von Druckzylindern für den Tiefdruck.The invention relates to the field of electronic reproduction technology and relates to an engraving member of an electronic engraving machine for engraving printing cylinders for gravure printing.
In einer elektronischen Graviermaschine bewegt sich ein Gravierorgan mit einem Gravierstichel als Schneidwerkzeug in axialer Richtung an einem rotierenden Druckzylinder entlang. Der von einem Graviersteuersignal gesteuerte Graviersti- chel schneidet gravierlinienweise in einem Gravurraster angeordnete Näpfchen in die Mantelfläche des Druckzylinders. Das Graviersteuersignal wird durch Überlagerung eines periodischen Rastersignals mit Bildsignalwerten gebildet, welche die zu reproduzierenden Tonwerte zwischen "Schwarz" und "Weiß" repräsentieren. Zur Erzeugung des Gravurrasters bewirkt das Rastersignal eine vibrierende Hub- bewegung des Gravierstichels in Richtung des Druckzylinders, wobei die Bildsignalwerte entsprechend den zu reproduzierenden Tonwerten die Graviertiefen der Näpfchen bestimmen.In an electronic engraving machine, an engraving element with an engraving stylus as a cutting tool moves in the axial direction along a rotating printing cylinder. The engraving stylus, which is controlled by an engraving control signal, cuts wells arranged in engraving lines in an engraving grid into the outer surface of the printing cylinder. The engraving control signal is formed by superimposing a periodic raster signal with image signal values which represent the tonal values to be reproduced between "black" and "white". To generate the engraving screen, the screen signal causes the engraving stylus to vibrate in the direction of the printing cylinder, the image signal values determining the engraving depths of the cells in accordance with the tone values to be reproduced.
Aus der DE-A-23 36 089 ist ein Gravierorgan mit einem elektromagnetischen An- triebselement für den Gravierstichel bekannt. Das elektromagnetische Antriebselement besteht aus einem mit dem Graviersteuersignal beaufschlagten, stationären Elektromagneten, in dessen Luftspalt sich der Anker eines Drehsystems bewegt. Das Drehsystem besteht aus einer Welle, dem Anker, einem Lager für die Welle und aus einer Dämpfungsvorrichtung. Ein Wellenende geht in einen raum- fest eingespannten, federnden Torsionsstab über, während das andere Wellenende einen Hebel trägt, an dem der Gravierstichel angebracht ist.From DE-A-23 36 089 an engraving element with an electromagnetic drive element for the engraving stylus is known. The electromagnetic drive element consists of a stationary electromagnet to which the engraving control signal is applied, in the air gap of which the armature of a rotating system moves. The rotating system consists of a shaft, the armature, a bearing for the shaft and a damping device. One shaft end merges into a resilient torsion bar that is clamped in place, while the other shaft end carries a lever to which the engraving stylus is attached.
Der Gravierstichel ist in der Praxis häufig ein prismatisch geschliffener Diamant, der mit seinem Schaft an dem Hebel des Gravierorgans befestigt ist. Der Gravier- Stichel besteht im wesentlichen aus einer bezüglich der Gravierrichtung vorderen Spanfläche und einer von der Spanfläche abgewandten schräg verlaufenden hinteren Freifläche. Die Schnittlinien zwischen der Spanfläche und der Freifläche bilden die Schneidenspitze des Gravierstichels. Der Winkel zwischen der schräg verlaufenden Freifläche und der Tangentialebene im Berührungspunkt von Schneidenspitze und Mantelfläche des Druckzylinders wird als Freiwinkel bezeichnet.In practice, the engraving stylus is often a prismatic cut diamond, which is attached with its shaft to the lever of the engraving element. The engraving stylus essentially consists of a front rake face with respect to the engraving direction and an oblique rear open face facing away from the rake face. The intersection lines between the rake face and the free face form the cutting tip of the engraving stylus. The angle between the sloping free surface and the tangential plane at the point of contact between the cutting tip and the lateral surface of the printing cylinder is referred to as the clearance angle.
Der Freiwinkel des Gravierstichels begrenzt die Steilheit, mit der der Gravierstichel in den Druckzylinder eindringen kann, ohne daß die Freifläche auf die Wandung der Näpfchen aufsetzt. Zur Gravur unterschiedlicher Gravurraster werden in Gravierlinienrichtung gestauchte Näpfchen mit einer steilen Wandung und gelängte Näpfchen mit einer flachen Wandung graviert. Bei der Gravur von gestauchten Näpfchen kann es in nachteiliger Weise vorkommen, daß die Freifläche des Gravierstichels auf die Wandung der Näpfchen aufsetzt und der Schneidprozeß unterbrochen wird. Die Folge ist, daß die zur tonwertrichtigen Gravur erforderlichen Graviertiefen nicht erreicht und Näpfchen mit einer unerwünschten asymmetrische Form graviert werden.The clearance angle of the engraving stylus limits the steepness with which the engraving stylus can penetrate the printing cylinder without the free surface touching the wall of the cups. To engrave different engraving grids, wells that are compressed in the direction of the engraving line are engraved with a steep wall and elongated wells are engraved with a flat wall. When engraving squeezed cells, it can disadvantageously occur that the free surface of the engraving stylus touches the wall of the cells and the cutting process is interrupted. The result is that the engraving depths required for engraving with the correct tonal value are not reached and cups with an undesirable asymmetrical shape are engraved.
Um auch gestauchte Näpfchen mit einer steilen Wandung ohne Tonwertverfälschung gravieren zu können, müßte der Freiwinkel entsprechend vergrößert werden. Es hat sich aber in der Praxis herausgestellt, daß bei einem vergrößerten Freiwinkels die Gefahr eines Bruchs der Schneidenspitze des Diamanten wächst. Häufige Wechsel des Gravierstichels sowie zeit- und kostenaufwendige und Neugravuren wären die Folge.In order to be able to engrave upset wells with a steep wall without falsifying the tonal value, the clearance angle would have to be increased accordingly. In practice, however, it has been found that the risk of breakage of the cutting tip of the diamond increases with an increased clearance angle. Frequent changes of the engraving stylus as well as time-consuming and costly and new engravings would be the result.
Der Erfindung liegt die Aufgabe zugrunde, ein Gravierorgan einer elektronischen Graviermaschine zur Gravur von Druckformen derart zu verbessern, daß insbe- sondere auch bei gestauchten Näpfchen eine tonwertrichtige Gravur erreicht wird.The invention is based on the object of improving an engraving element of an electronic engraving machine for engraving printing forms in such a way that engraving with the correct tone value is achieved in particular even with upset cells.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen sind in den Unteransprüchen angegeben.This object is solved by the features of claim 1. Advantageous further developments and refinements are specified in the subclaims.
Die Erfindung wird nachfolgend anhand der Fig. 1 und 2 näher erläutert. Es zeigen:The invention is explained in more detail below with reference to FIGS. 1 and 2. Show it:
Fig. 1 den prinzipiellen Aufbau eines Gravierorgans undFig. 1 shows the basic structure of an engraving element and
Fig. 2 einen Gravierstichel und einen Druckzylinder (ausschnittsweise) im Querschnitt.Fig. 2 shows an engraving stylus and an impression cylinder (in sections) in cross section.
Fig. 1 zeigt in einer perspektivischen Darstellung den Aufbau eines Gravierorgans, das prinzipiell ein Antriebssystem, im gezeigten Beispiel ein elektromagnetisches Antriebssystem, und ein Drehsystem aufweist.1 shows a perspective illustration of the structure of an engraving element, which in principle has a drive system, in the example shown an electromagnetic drive system, and a rotary system.
Das elektromagnetische Antriebselement besteht aus einem stationären Elektromagneten (1 ) mit zwei sich gegenüber liegenden u-förmigen Blechpaketen (2) und zwei zwischen den Schenkeln der Blechpakete (2) liegenden Luftspalten (3). In den Aussparungen (4) der Blechpakete (2) des Elektromagneten (1 ) befindet sich eine Spule (5), von der nur eine Spulenseite dargestellt ist. Die Spule (5) wird von einem Graviersteuersignal durchflössen.The electromagnetic drive element consists of a stationary electromagnet (1) with two opposing u-shaped laminated cores (2) and two air gaps (3) between the legs of the laminated cores (2). In the recesses (4) of the laminated core (2) of the electromagnet (1) there is a coil (5), of which only one side of the coil is shown. An engraving control signal flows through the coil (5).
Das Drehsystem besteht aus einer Welle (6), einem an der Welle (6) befestigten Anker (7), sowie aus einer Dämpfungsvorrichtung (8) und einem Lager (9) für die Welle (6). Der Anker (7) ist in den Luftspalten (3) des Elektromagneten (1) bewegbar. Ein Wellenende geht in einen federnden Torsionsstab (10) über, der in einem ortsfesten Auflager (11 , 12) eingespannt ist. Das andere Wellenende (13) trägt einen Hebel (14), an dem ein Gravierstichel (15) beispielsweise in Form eines Dia- manten angebracht ist. Die Dämpfungsvorrichtung (8) und das Lager (9), sind zwischen dem Anker (7) und dem Hebel (14) mit dem Gravierstichel (15) angeordnet.The rotating system consists of a shaft (6), an armature (7) attached to the shaft (6), and a damping device (8) and a bearing (9) for the shaft (6). The armature (7) can be moved in the air gaps (3) of the electromagnet (1). One end of the shaft merges into a resilient torsion bar (10) which is clamped in a fixed support (11, 12). The other shaft end (13) carries a lever (14) on which an engraving stylus (15) is attached, for example in the form of a diamond. The damping device (8) and the bearing (9) are arranged between the armature (7) and the lever (14) with the engraving stylus (15).
Durch das in den Luftspalten (2) des Elektromagneten (1) erzeugte Magnetfeld wird auf den Anker (7) der Welle (6) ein elektrisches Drehmoment ausgeübt, dem das mechanische Drehmoment des Torsionsstabes (10) entgegenwirkt. Das elektrische Drehmoment dreht die Welle (6) um ihre Längsachse mit einen dem jewei- ligen Graviersteuersignalwert proportionalen Drehwinkel aus einer Ruhelage heraus, und der Torsionsstab (10) bringt die Welle (6) in die Ruhelage zurück. Durch die Drehung der Welle (6) führt der Gravierstichel (15) eine in Richtung auf die Mantelfläche eines nicht dargestellten Druckzylinders gerichtete Hubbewegung aus, welche die Eindringtiefe des Gravierstichels (15) in den Druckzylinder bestimmt. Das Antriebssystem für den Gravierstichel (15) kann auch als Festkörper- Aktorelement ausgebildet sein, das beispielsweise aus einem piezoelektrischen oder einem magnetostriktiven Material besteht.The magnetic field generated in the air gaps (2) of the electromagnet (1) exerts an electrical torque on the armature (7) of the shaft (6), which counteracts the mechanical torque of the torsion bar (10). The electrical torque rotates the shaft (6) about its longitudinal axis with one of the respective current engraving control signal value proportional angle of rotation from a rest position, and the torsion bar (10) brings the shaft (6) back to the rest position. The rotation of the shaft (6) causes the engraving stylus (15) to perform a lifting movement in the direction of the lateral surface of a printing cylinder, not shown, which determines the depth of penetration of the engraving stylus (15) into the printing cylinder. The drive system for the engraving stylus (15) can also be designed as a solid-state actuator element, which consists, for example, of a piezoelectric or a magnetostrictive material.
Fig. 2 zeigt einen Querschnitt durch den Gravierstichel und einen Druckzylinder. Dargestellt ist ein radialer Teilquerschnitt durch einen Druckzylinder (16) im Bereich seiner Mantelfläche (17). Dargestellt ist außerdem der als prismatisch geschliffener Diamant ausgebildete Gravierstichel (15) im Querschnitt. Der rotierende Druckzylinder (16) möge sich in Richtung eines Pfeiles (18) unter dem Graviersti- chel (15) entlang bewegen, wobei ein Pfeil (19) die Gravierrichtung für die Näpfchen (20) auf einer umfangsmäßigen Gravierlinie auf der Mantelfläche (17) des Druckzylinders (16) angibt.Fig. 2 shows a cross section through the engraving stylus and a pressure cylinder. A radial partial cross section through a pressure cylinder (16) is shown in the area of its lateral surface (17). The engraving stylus (15), which is designed as a prismatic cut diamond, is also shown in cross section. The rotating printing cylinder (16) may move in the direction of an arrow (18) under the engraving stylus (15), an arrow (19) indicating the direction of engraving for the cups (20) on a circumferential engraving line on the lateral surface (17) of the printing cylinder (16) indicates.
Der Gravierstichel (15) besteht im wesentlichen aus einem Schaft (21 ), einer be- züglich der Gravierrichtung (19) vorderen Spanfläche (22) und einer von der Spanfläche (22) abgewandten Freifläche (23). Die Schnittlinien zwischen der Spanfläche (22) und der Freifläche (23) bilden die Schneidenspitze (24) des Gravierstichels (15). Die Freifläche (23) schließt mit einer Tangentialfläche im Berührungspunkt von Schneidenspitze (24) und Mantelfläche (17) des Druckzylin- ders (16) den Freiwinkel (α) ein.The engraving stylus (15) essentially consists of a shaft (21), a rake face (22) which is at the front with respect to the engraving direction (19) and a free face (23) facing away from the rake face (22). The cutting lines between the rake surface (22) and the free surface (23) form the cutting tip (24) of the engraving stylus (15). The free surface (23) encloses the clearance angle (α) with a tangential surface in the point of contact of the cutting tip (24) and the outer surface (17) of the pressure cylinder (16).
Das nicht dargestellte Gravierorgan ist derart zur Mantelfläche (17) des Druckzylinders (16) ausgerichtet, daß der Gravierstichel (15) zur Gravur der Näpfchen (20) eine durch einen Doppelpfeil (25) gekennzeichnete Hubbewegung in Richtung auf den Druckzylinder (16) und in Gegenrichtung ausführt. Um insbesondere gestauchte Näpfchen (20) tonwertrichtig gravieren zu können, wird der Freiwinkel (α) des Gravierstichels (15) erfindungsgemäß dadurch vergrößert, daß der Gravierstichel (15) in Gravierrichtung (19) gegenüber einer jeweils radial zum Druckzyiinder (16), d.h. senkrecht zur Mantelfläche (17), verlaufenden Bezugsgeraden (26) geneigt angeordnet ist. Der Neigungswinkel (ß), den der geneigte Gravierstichels (15) mit der Bezugsgeraden (26) einschließt, wird in zweckmäßiger weise 1° bis 5°, vorzugsweise 3°, gewählt. Durch die erfindungsgemäße Maßnahme bleibt der Keilwinkel zwischen Spanfläche (22) und Freifläche (23) des Gravierstichels (15) erhalten, wodurch in vorteilhafter Weise trotz vergrö- ßertem Freiwinkel (α) die Gefahr eines Stichelbruches minimal ist.The engraving element, not shown, is aligned with the lateral surface (17) of the printing cylinder (16) in such a way that the engraving stylus (15) for engraving the cups (20) has a stroke movement, indicated by a double arrow (25), in the direction of the printing cylinder (16) and in Opposite direction. In order, in particular, to be able to engrave upset cups (20) with the correct tone value, the clearance angle (α) of the engraving stylus (15) is increased according to the invention in that the engraving stylus (15) in the engraving direction (19) relative to one each radially to the printing cylinder (16), ie perpendicularly is arranged inclined to the lateral surface (17), extending reference straight line (26). The angle of inclination (β), which the inclined engraving stylus (15) includes with the reference straight line (26), is expediently chosen to be 1 ° to 5 °, preferably 3 °. As a result of the measure according to the invention, the wedge angle between the rake face (22) and the free face (23) of the engraving stylus (15) is retained, which advantageously minimizes the risk of a stylus break despite the increased clearance angle (α).
In einem ersten Ausführungsbeispiel wird das Kippen des Gravierstichels (15) bezüglich der Mantelfläche (17) durch eine entsprechend gekippte Befestigung, beispielsweise durch Klebung, des Gravierstichels (15) in dem Hebel (14) des Gravierorgans erreicht. Das ortsgenaue Einsetzen des Gravierstichels (15) in den Hebel (14) wird beispielsweise mittels einer Montagevorrichtung nach der DE-PS 22 13 768 durchgeführt.In a first exemplary embodiment, the tilting of the engraving stylus (15) with respect to the lateral surface (17) is achieved by a correspondingly tilted fastening, for example by gluing, of the engraving stylus (15) in the lever (14) of the engraving member. The exact insertion of the engraving stylus (15) into the lever (14) is carried out, for example, by means of a mounting device according to DE-PS 22 13 768.
In einem zweiten Ausführungsbeispiel wird das Kippen des Gravierstichels (15) durch konstruktive Neigung der Längsachse des Drehsystems (6, 7, 8, 9) des Gravierorgans gegenüber einer an die Mantelfläche (17) des Druckzylinders (16) angelegten Bezugstangente erreicht. In a second exemplary embodiment, the tilting of the engraving stylus (15) is achieved by constructively inclining the longitudinal axis of the rotating system (6, 7, 8, 9) of the engraving member in relation to a reference tangent applied to the lateral surface (17) of the printing cylinder (16).

Claims

Patentansprüche claims
1 . Gravierorgan einer elektronischen Graviermaschine zur Gravur von Druckzy- lindern, bestehend aus1 . Engraving element of an electronic engraving machine for engraving printing cylinders, consisting of
- einem um kleine Winkel oszillierenden Drehsystem (6, 8, 9, 10,14),- a rotating system (6, 8, 9, 10, 14) oscillating through small angles,
- einem Antriebssystem (1 , 7) für das Drehsystem (6, 8, 9, 10,14) und- A drive system (1, 7) for the rotating system (6, 8, 9, 10, 14) and
- einem an dem Drehsystem (6, 8, 9, 10,14) angebrachten Gravierstichel (15) zur Gravur von Näpfchen (20) in dem Druckzylinder (16), wobei der Gravier- Stichel (15) jeweils zur Gravur eines Näpfchens (20) eine auf den Druckzylinder (16) gerichtete Hubbewegung ausführt, dadurch gekennzeichnet, daß der Gravierstichel (15) zur Vergrößerung seines Freiwinkels (α) bezüglich einer senkrecht zur Mantelfläche (17) des Druckzylinders (16) verlaufenden Bezugsgeraden (26) in Richtung (19) der Gravur der Näpfchen (20) gekippt angeordnet ist.- One on the rotating system (6, 8, 9, 10, 14) attached engraving stylus (15) for engraving cups (20) in the printing cylinder (16), the engraving stylus (15) each for engraving a cup (20 ) executes a lifting movement directed at the printing cylinder (16), characterized in that the engraving stylus (15) increases its clearance angle (α) with respect to a reference straight line (26) extending in the direction (19) perpendicular to the lateral surface (17) of the printing cylinder (16) ) the engraving of the cups (20) is arranged tilted.
2. Gravierorgan nach Anspruch 1 , dadurch gekennzeichnet, daß der Neigungswinkel (ß) des Gravierstichels (15) gegenüber der Bezugsgeraden (26) zwischen 1 ° und 5° beträgt.2. Engraving element according to claim 1, characterized in that the angle of inclination (β) of the engraving stylus (15) relative to the reference straight line (26) is between 1 ° and 5 °.
3. Gravierorgan nach Anspruch 2, dadurch gekennzeichnet, daß der Neigungswinkel (ß) des Gravierstichels (15) gegenüber der Bezugsgeraden (26) 3° beträgt.3. Engraving element according to claim 2, characterized in that the angle of inclination (β) of the engraving stylus (15) with respect to the reference straight line (26) is 3 °.
4. Gravierorgan nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Drehsystem (6, 8, 9, 10,14) aus folgenden Komponenten besteht4. Engraving element according to at least one of claims 1 to 3, characterized in that the rotating system (6, 8, 9, 10, 14) consists of the following components
- einer mit kleinen Drehwinkeln oszillierenden Welle (6),- a shaft (6) oscillating with small angles of rotation,
- einem an einem Ende der Welle (6) befindlichen Hebel (14), an dem der Gravierstichel (15) angebracht ist,- a lever (14) located at one end of the shaft (6), on which the engraving stylus (15) is attached,
- einem Lager (9) für die Welle (6), - einem Rückstellelement (10) für die Welle (6) und- a bearing (9) for the shaft (6), - A return element (10) for the shaft (6) and
- einer an die Welle (6) angreifenden Dämpfungsanordnung (8).- A damping arrangement (8) engaging the shaft (6).
5. Gravierorgan nach mindestens einem der Ansprüche 1 bis 4, dadurch ge- kennzeichnet, daß der Gravierstichel (15) in dem Hebel (14) um den Neigungswinkel (ß) gekippt befestigt ist.5. Engraving element according to at least one of claims 1 to 4, characterized in that the engraving stylus (15) in the lever (14) is attached tilted by the angle of inclination (β).
6. Gravierorgan nach mindestens einem der Ansprüche 1 bis 4, dadurch gekenn- zeichent, daß die Welle (6) gegenüber ihrer Normallage zum Druckzylinder (16) um den Neigungswinkel (ß) gekippt angeordnet ist.6. Engraving element according to at least one of claims 1 to 4, characterized in that the shaft (6) is tilted relative to its normal position relative to the printing cylinder (16) by the angle of inclination (β).
7. Gravierorgan nach mindestens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Gravierstichel (15) an dem Hebel (14) durch Klebung befestigt ist.7. engraving element according to at least one of claims 1 to 6, characterized in that the engraving stylus (15) on the lever (14) is fixed by gluing.
8. Gravierorgan nach mindestens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Gravierstichel (15) ein Diamant ist.8. engraving element according to at least one of claims 1 to 7, characterized in that the engraving stylus (15) is a diamond.
9. Gravierorgan nach mindestens einem der Ansprüche 1 bis 8, dadurch ge- kennzeichnet, daß die Dämpfungsvorrichtung (8) und das Lager (9) für die9. Engraving element according to at least one of claims 1 to 8, characterized in that the damping device (8) and the bearing (9) for
Welle (6) zwischen dem Antriebssystem (1 , 7) und dem Hebel (14) angeordnet sind. Shaft (6) between the drive system (1, 7) and the lever (14) are arranged.
EP99963198A 1999-01-25 1999-11-04 Engraver Expired - Lifetime EP1150842B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19902884A DE19902884B4 (en) 1999-01-25 1999-01-25 engraving
DE19902884 1999-01-25
PCT/DE1999/003521 WO2000043203A1 (en) 1999-01-25 1999-11-04 Engraver

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EP1150842A1 true EP1150842A1 (en) 2001-11-07
EP1150842B1 EP1150842B1 (en) 2003-05-21

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US (1) US6736035B1 (en)
EP (1) EP1150842B1 (en)
JP (1) JP3605364B2 (en)
CN (1) CN1109602C (en)
DE (2) DE19902884B4 (en)
WO (1) WO2000043203A1 (en)

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US7267856B2 (en) * 2002-10-07 2007-09-11 Pactiv Corporation Ultrasonic end stops on zipper closure bags and methods for making same
US20070107289A1 (en) * 2005-11-16 2007-05-17 Shimer Gary W Picture frame system
DE102012009532A1 (en) * 2012-05-04 2013-11-07 Hell Gravure Systems Gmbh & Co. Kg Engraving device for engraving printing forms
JP6582282B2 (en) * 2014-10-30 2019-10-02 株式会社ワールドベンチャー Image engraving equipment

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DE2213768C3 (en) 1972-03-22 1979-03-08 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Method and device for the precise insertion of a cutting element for the production of an engraving stylus for electronic printing form engraving machines
DE2356729A1 (en) * 1972-11-24 1974-05-30 Raymond Jean Louis MULTI-PURPOSE ENGRAVING MACHINE
CH579985A5 (en) 1973-07-16 1976-09-30 Hell Rudolf Dr Ing Gmbh
DE2365637A1 (en) * 1973-07-16 1975-10-30 Hell Rudolf Dr Ing Gmbh Print plate engraving machine registration system - has oscillating shaft damped by components between it and frame
US5440398A (en) * 1993-02-25 1995-08-08 Ohio Electronic Engravers, Inc. Error detection apparatus and method for use with engravers
US5831746A (en) * 1993-02-25 1998-11-03 Ohio Electronic Engravers, Inc. Engraved area volume measurement system and method using pixel data
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Also Published As

Publication number Publication date
DE19902884A1 (en) 2000-07-27
CN1109602C (en) 2003-05-28
JP3605364B2 (en) 2004-12-22
US6736035B1 (en) 2004-05-18
DE19902884B4 (en) 2006-07-13
DE59905687D1 (en) 2003-06-26
JP2002535165A (en) 2002-10-22
CN1333718A (en) 2002-01-30
EP1150842B1 (en) 2003-05-21
WO2000043203A1 (en) 2000-07-27

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