EP0001987B1 - Apparatus for transferring powder symbols from a permanently circulating intermediate web onto a recording web - Google Patents

Apparatus for transferring powder symbols from a permanently circulating intermediate web onto a recording web Download PDF

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Publication number
EP0001987B1
EP0001987B1 EP78101199A EP78101199A EP0001987B1 EP 0001987 B1 EP0001987 B1 EP 0001987B1 EP 78101199 A EP78101199 A EP 78101199A EP 78101199 A EP78101199 A EP 78101199A EP 0001987 B1 EP0001987 B1 EP 0001987B1
Authority
EP
European Patent Office
Prior art keywords
bar
intermediate carrier
strip
carrier
toner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78101199A
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German (de)
French (fr)
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EP0001987A1 (en
Inventor
Wolfgang Von Tluck
Bernhard Schlageter
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0001987A1 publication Critical patent/EP0001987A1/en
Application granted granted Critical
Publication of EP0001987B1 publication Critical patent/EP0001987B1/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/754—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to band, e.g. tensioning
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to a device for transfer printing of toner images applied to a continuously rotating belt-shaped intermediate carrier onto a recording medium, in particular for printing and copying machines.
  • Printing processes are known from the literature, in which images of the characters to be printed are generated on a ribbon-shaped intermediate carrier according to the electrostatic or magnetic principle, then developed with the aid of toner and in a transfer station from the ribbon-shaped intermediate carrier to a recording medium moved perpendicular to the ribbon-shaped intermediate carrier be transmitted.
  • the toner images transferred to the recording medium are then melted into the recording medium in a fixing station.
  • the transfer of the toner images from the intermediate carrier to the recording medium can be done line by line. It is known that the transfer of the toner images from the intermediate carrier to the recording medium can take place contactlessly under the influence of an electrical or magnetic field which acts periodically through the recording medium on the intermediate carrier (DE-OS 2 054 262, US 3,509,816).
  • a disadvantage of this method is the poor efficiency in transferring the toner to the recording medium, since only a small part of the toner adhering to the belt-shaped intermediate carrier is transferred to the recording medium, whereas the main part remains on the intermediate carrier, from where it is subsequently removed got to.
  • a printing device with a continuous, endless, band-shaped intermediate carrier on which color images of the characters to be printed are generated.
  • the transfer printing onto a paper sheet takes place in that the intermediate carrier is printed on the paper sheet by a printing stamp.
  • the intermediate carrier is thus stopped at the transfer printing point during the transfer printing process, while it is continuously being moved past the recording device.
  • the different types of movement are achieved with the aid of tape storage devices with vacuum chambers, which are arranged in front of and behind the recording device. This printing device thus requires additional tape storage devices.
  • DE-A-2 106 259 discloses a printing method for transferring powder images line by line from a strip-shaped intermediate carrier to a text strip. During the transfer process, the intermediate carrier is stopped and then the intermediate carrier is brought into contact with the text strips in an electrical field. This method thus works in the start-stop mode of the intermediate carrier.
  • the object on which the invention is based is to provide a device for transfer printing of toner characters applied to a continuously rotating band-shaped intermediate carrier onto a recording medium, in which a high percentage of the toner on the intermediate carrier is transferred to the recording medium during transfer printing and which is nevertheless of simple construction .
  • This object is achieved in that the intermediate carrier consists of an elastic material and that mechanical means are provided by which the intermediate carrier is brought into contact with the concrete side with the recording medium during the transfer printing process, the area of the intermediate carrier provided for the transfer printing comes to a standstill.
  • the mechanical means can easily consist of a fixed bar, which is arranged on one side of the intermediate support, and a movable bar, which is located on the other side of the intermediate support.
  • the bar can be moved perpendicular to the direction of movement of the intermediate carrier and thereby press the intermediate carrier onto the recording medium.
  • the movable bar is expediently arranged adjacent to the non-concrete side of the intermediate beam.
  • the record carrier then runs between the bar and the concrete side of the intermediate carrier.
  • the movement of the bar to and from the intermediate carrier can be easily realized with the help of electromagnets and springs.
  • the electromagnets, the armatures of which are attached to the beam can move the beam to the intermediate beam, the springs bring the beam back to its rest position.
  • Another embodiment of a device for moving the bar can consist of electromagnet arrangements, each of which has a pressure magnet, a return magnet and a common armature.
  • the bar is moved to the intermediate carrier by actuation of the pressure magnet, and the bar is returned to its rest position by actuation of the return magnet.
  • the return magnet also ensures that the beam remains in its rest position.
  • FIG. 1 The basic structure of a printer results from FIG.
  • a continuously rotating band-shaped intermediate carrier 1 is provided, which in the line direction of a recording medium 6, z. B. a paper web.
  • the intermediate carrier 1 is guided by a drive wheel 2 driven by a motor by means of a pressure roller 3 and is separated from the recording medium 6 by an air gap 5.
  • the intermediate carrier consists of an elastic plastic and has, on the side facing the recording medium 6, an electrostatically chargeable and electrostatically or electrophotographically dischargable or a magnetizable and demagnetizable layer.
  • the characters to be printed are now generated in a known manner using a write head 7 in a known manner and stored in the form of electrical or magnetic field strength differences on the intermediate carrier 1.
  • These images are colored with toner in a developer station 8 and transferred from the intermediate carrier 1 to the recording medium 6 in a transfer printing station 9. Behind the transfer printing station 9 there is a rotating cleaning brush 10 with a suction device which cleans the intermediate carrier from residual toner. In a subsequent discharge or demagnetization station 11, the electrostatic or magnetic image still stored on the intermediate carrier 1 is deleted.
  • the recording medium 6 is at rest for the duration of the transfer printing process. During the time in which the intermediate carrier 1 with the toner image of the next line to be printed is transported into the transfer printing station 9, the recording medium 6 is fed with a line spacing or a multiple thereof. The powder image which can still be blended and is printed on the recording medium is then in a fixing station, which is not shown in FIG. B. fixed with the help of heat and pressure.
  • the intermediate carrier 1 In order to bring the intermediate carrier 1 into direct contact with the recording medium 6 during the transfer printing process, the intermediate carrier 1 is struck on the recording medium only very briefly by means of a bar 2 which is arranged on one side of the intermediate carrier.
  • the record carrier - is supported against a stationary bar 13, which is arranged on the other side of the intermediate carrier.
  • the bar 12 is moved to the bar 13, and the intermediate carrier 1 is brought into contact with the recording medium 6.
  • the device for moving the bar 12 to the bar 13 can be constructed in various ways.
  • FIG. 1 A first embodiment of this device is shown in FIG. 1.
  • at least two electromagnets 14 are provided, the armatures 22 of which are fastened to the beam 12. If the bar 12 is to be moved to the bar 13, these magnets 14 are excited, the armatures 22 are drawn into the magnets 14, the bar 12 being guided in the direction of the bar 13. After the excitation of the electromagnets 14 has been switched off, the bar 12 is brought back into its rest position by means of springs 15.
  • the means for movement of the beam 12 of at least two Elektromagnetanordnun g s.
  • Each electromagnet arrangement is composed of a pressure magnet 16, a return magnet 17 and a common armature 18 articulated on the bar 12 (FIG. 2).
  • the return magnets 17 are traversed by a weak current I 17 (FIG . 3). If the toner image is to be transferred from the intermediate carrier to the recording medium, a current pulse 16 of such duration is given to the pressing magnets 16 while simultaneously switching off the current for the return magnets 17 that the bar 12 securely comes to a stop against the recording medium and the stationary bar. After completion of the current pulse 1 16 for the pressure magnets 16, a return pulse is fed to the return magnets 17; and the return magnets bring the beam back into the rest position. After that for the The necessary duration of the return process, the current I 17 flowing through the return magnets 17 is reduced again to a smaller value, which is sufficient to hold the bar 12 in the rest position.
  • the part of the intermediate carrier 1 located in the area of the bar comes to a brief standstill during the striking, while the remaining length of the intermediate carrier 1 is moved further by the drive wheel 2.
  • the part of the intermediate carrier 1 which is located between the right end of the beam 12 and the drive wheel 2 is inevitably stretched, while the part of the intermediate carrier located between the left end of the beam 12 and the drive wheel 2 is relaxed.
  • the intermediate carrier must be sufficiently elastic so that no damage to the intermediate carrier can occur when the intermediate carrier is tensioned and relaxed.
  • plastic materials that meet this requirement are known (e.g. polyethylene terephthalate).
  • a brake body can be arranged in the strip 20, which is arranged adjacent to the recording medium 6 and which, in the idle state, projects beyond the surface of the recording medium.
  • FIG. 4 A first embodiment of such a brake body results from FIG. 4.
  • a brake body 19 made of elastic material, e.g. B. plastic, so stored in the bar 20 that it projects beyond the surface of the recording medium 6 in the idle state.
  • the brake body 19 comes into contact with the intermediate carrier 1 and brakes it to a standstill before the bar has placed itself against the recording medium 6 as the pressing process progresses. Accordingly, when the bar is moved away, the braking of the intermediate carrier 1 is maintained until an air gap has formed between the recording medium and the intermediate carrier and blurring is thus avoided.
  • a second embodiment of the brake body is shown in FIG. 6.
  • a metal block 21, which is resiliently mounted in the strip 22, serves as the brake body.
  • FIG. 5 a section through the brake body 19 of FIG. 24 is shown, from which it follows that the brake body 19 during the transfer printing process only contacts the areas of the intermediate carrier 1 which are not provided with toner. This prevents the toner from blurring the toner image.
  • an electrical voltage or a magnetic field can be applied between the bar 12 and the fixed bar 13, as a result of which an attractive force is exerted on the toner in the direction of the recording medium 6.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Umdruck von auf einem ständig umlaufenden bandförmigen Zwischenträger aufgebrachten Tonerbildern auf einen Aufzeichnungsträger, insbesondere für Druck- und Kopiergeräte.The invention relates to a device for transfer printing of toner images applied to a continuously rotating belt-shaped intermediate carrier onto a recording medium, in particular for printing and copying machines.

Aus der Literatur sind Druckverfahren bekannt, bei denen nach dem elektrostatischen oder magnetischen Prinzip Bilder der zu drukkenden Zeichen auf einem bandförmigen Zwischenträger erzeugt werden, anschließend mit Hilfe von Toner entwickelt werden und in einer Umdruckstation von dem bandförmigen Zwischenträger auf einen senkrecht zum bandförmigen Zwischenträger bewegten Aufzeichnungsträger übertragen werden. Die auf den Aufzeichnungsträger übertragenen Tonerbilder werden anschließend in einer Fixierstation in den Aufzeichnungsträger eingeschmolzen. Der Umdruck der Tonerbilder vom Zwischenträger auf den Aufzeichnungsträger kann zeilenweise erfolgen. Dabei ist es bekannt, daß die Übertragung der Tonerbilder von dem Zwischenträger auf den Aufzeichnungsträger berührungslos unter Einfluß eines durch den Aufzeichnungsträger auf den Zwischenträger periodisch einwirkenden elektrischen oder magnetischen Feldes erfolgen kann (DE-OS 2 054 262, US 3 509 816).Printing processes are known from the literature, in which images of the characters to be printed are generated on a ribbon-shaped intermediate carrier according to the electrostatic or magnetic principle, then developed with the aid of toner and in a transfer station from the ribbon-shaped intermediate carrier to a recording medium moved perpendicular to the ribbon-shaped intermediate carrier be transmitted. The toner images transferred to the recording medium are then melted into the recording medium in a fixing station. The transfer of the toner images from the intermediate carrier to the recording medium can be done line by line. It is known that the transfer of the toner images from the intermediate carrier to the recording medium can take place contactlessly under the influence of an electrical or magnetic field which acts periodically through the recording medium on the intermediate carrier (DE-OS 2 054 262, US 3,509,816).

Ein Nachteil dieses Verfahrens liegt in dem schlechten Wirkungsgrad bei der Übertragung des Toners auf den Aufzeichnungsträger, da nur ein geringer Teil des an dem bandförmigen Zwischenträger haftenden Toners auf den Aufzeichnungsträger übertragen wird, der Hauptteil dagegen auf dem Zwischenträger verbleibt, von wo er anschließend entfernt werden muß.A disadvantage of this method is the poor efficiency in transferring the toner to the recording medium, since only a small part of the toner adhering to the belt-shaped intermediate carrier is transferred to the recording medium, whereas the main part remains on the intermediate carrier, from where it is subsequently removed got to.

Aus der DE-B-1 512 109 ist eine Druckvorrichtung mit einem umlaufenden, endlosen bandförmigen Zwischenträger bekannt, auf dem Farbbilder der zu druckenden Zeichen erzeugt werden. Der Umdruck auf ein Papierblatt erfolgt dadurch, daß der Zwischenträger durch einen Druckstempel auf das Papierblatt gedruckt wird. Der Zwischenträger wird somit an der Umdruckstelle während des Umdruckvorgangs angehalten, während er an der Aufzeichnungseinrichtung kontinuierlich vorbeibewegt wird. Die unterschiedlichen Bewegungsarten werden mit Hilfe von Bandspeichereinrichtungen mit Unterdruckkammern erreicht, die vor und hinter der Aufzeichnungseinrichtung angeordnet sind. Diese Druckvorrichtung erfordert somit zusätzliche Bandspeichereinrichtungen.From DE-B-1 512 109 a printing device with a continuous, endless, band-shaped intermediate carrier is known, on which color images of the characters to be printed are generated. The transfer printing onto a paper sheet takes place in that the intermediate carrier is printed on the paper sheet by a printing stamp. The intermediate carrier is thus stopped at the transfer printing point during the transfer printing process, while it is continuously being moved past the recording device. The different types of movement are achieved with the aid of tape storage devices with vacuum chambers, which are arranged in front of and behind the recording device. This printing device thus requires additional tape storage devices.

Aus der DE-A-2 106 259 ist ein Druckverfahren zum zeilenweisen Übertragen von Pulverbildern von einem streifenförmigen Zwischenträger auf einen Textstreifen bekannt. Während des Übertragungsvorgangs wird der Zwischenträger angehalten und dann der Zwischenträger mit den Textstreifen in einem elektrischen Feld in Kontakt gebracht. Dieses Verfahren arbeitet somit im Start-Stop-Betrieb des Zwischenträgers.DE-A-2 106 259 discloses a printing method for transferring powder images line by line from a strip-shaped intermediate carrier to a text strip. During the transfer process, the intermediate carrier is stopped and then the intermediate carrier is brought into contact with the text strips in an electrical field. This method thus works in the start-stop mode of the intermediate carrier.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, eine Vorrichtung zum Umdruck von auf einem ständig umlaufenden bandförmigen Zwischenträger aufgebrachten Tonerzeichen auf einen Aufzeichnungsträger anzugeben, bei der ein hoher Prozentsatz des auf dem Zwischenträger befindlichen Toners beim Umdruck auf den Aufzeichnungsträger übertragen wird und die trotzdem einfach aufgebaut ist. Diese Aufgabe wird dadurch gelöst, daß der Zwischenträger aus einem elastischen Material besteht, und daß mechanische Mittel vorgesehen sind, durch die während des Umdruckvorgangs der Zwischenträger mit der betonerten Seite mit dem Aufzeichnungsträger in Berührung gebracht wird, wobei der für den Umdruck vorgesehene Bereich des Zwischenträgers zum Stillstand kommt.The object on which the invention is based is to provide a device for transfer printing of toner characters applied to a continuously rotating band-shaped intermediate carrier onto a recording medium, in which a high percentage of the toner on the intermediate carrier is transferred to the recording medium during transfer printing and which is nevertheless of simple construction . This object is achieved in that the intermediate carrier consists of an elastic material and that mechanical means are provided by which the intermediate carrier is brought into contact with the concrete side with the recording medium during the transfer printing process, the area of the intermediate carrier provided for the transfer printing comes to a standstill.

Die mechanischen Mittel können auf einfache Weise aus einer ortsfesten Leiste, die auf der einen Seite des Zwischenträgers angeordnet ist, und aus einem bewegbaren Balken bestehen, der auf der anderen Seite des Zwischenträgers liegt. Der Balken kann senkrecht zur Bewegungsrichtung des Zwischenträgers bewegt werden und dabei den Zwischenträger an den Aufzeichnungsträger andrücken.The mechanical means can easily consist of a fixed bar, which is arranged on one side of the intermediate support, and a movable bar, which is located on the other side of the intermediate support. The bar can be moved perpendicular to the direction of movement of the intermediate carrier and thereby press the intermediate carrier onto the recording medium.

Dabei ist der bewegbare Balken zweckmäßigerweise benachbart zu der nichtbetonerten Seite des Zwischenträgers angeordnet. Der Aufzeichnungsträger verläuft dann zwischen der Leiste und der betonerten Seite des Zwischenträgers.The movable bar is expediently arranged adjacent to the non-concrete side of the intermediate beam. The record carrier then runs between the bar and the concrete side of the intermediate carrier.

Die Bewegung des Balkens zum und vom Zwischenträger weg kann auf einfache Weise mit Hilfe von Elektromagneten und Federn realisiert werden. Die Elektromagneten, deren Anker an dem Balken befestigt sind, können den Balken zum Zwischenträger bewegen, die Federn holen den Balken wieder in seine Ruhelage zurück.The movement of the bar to and from the intermediate carrier can be easily realized with the help of electromagnets and springs. The electromagnets, the armatures of which are attached to the beam, can move the beam to the intermediate beam, the springs bring the beam back to its rest position.

Eine andere Ausführung einer Einrichtung zur Bewegung des Balkens kann aus Elektromagnetanordnungen bestehen, die jeweils einen Andruckmagneten, einen Rückholmagneten und einen gemeinsamen Anker haben. Durch Betätigung des Andruckmagneten wird der Balken zum Zwischenträger bewegt, durch Betätigung des Rückholmagneten wird der Balken wieder in seine Ruhelage zurückgeholt. Der Rückholmagnet sorgt außerdem dafür, daß der Balken in seiner Ruhelage bleibt.Another embodiment of a device for moving the bar can consist of electromagnet arrangements, each of which has a pressure magnet, a return magnet and a common armature. The bar is moved to the intermediate carrier by actuation of the pressure magnet, and the bar is returned to its rest position by actuation of the return magnet. The return magnet also ensures that the beam remains in its rest position.

Es ist vorteilhaft, daß der Zwischenträger kurze Zeit vor seiner Berührung mit dem Aufzeichnungsträger zum Stillstand kommt und erst eine kurze Zeit nach Beendigung der Berührung wieder in seiner Laufrichtung in Bewegung gesetzt wird. Dazu kann in der Leiste ein Bremskörper angeordnet werden, der z. B. aus einem elastischen Material oder einem federnd gelagerten Metallklotz besteht. Dieser Bremskörper ragt über die Leiste hinaus und ist benachbart zum Aufzeichnungsträger in der Leiste angeordnet. Wird der Balken zum Zwischenträger bewegt, dann trifft der Zwischenträger zunächst auf den Bremskörper auf und kommt dabei zum Stillstand. Im weiteren Verlauf drückt dann der Balken den Zwischenträger gegen den Aufzeichnungsträger und bewirkt den Umdruck zum Zwischenträger. Dabei wird der Bremskörper zusammengedrückt. Bei der Bewegung in der entgegengesetzten Richtung bremst der Bremskörper den Zwischenträger noch ab, auch wenn bereits der Kontakt zwischen dem Zwischenträger und dem Aufzeichnungsträger gelöst worden ist. Zweckmäßig ist es, den Bremskörper an der dem Zwischenträger zugewandten Seite gabelförmig auszubilden, so daß er sich nur an den Bereichen des Zwischenträgers anlegen kann, in denen der Zwischenträger nicht mit Toner versehen ist. Im folgenden wird die Erfindung an Hand von Ausführungsbeispielen, die in den Figuren dargestellt sind, weiter erläutert. Es zeigt

  • Fig. 1 einen prinzipiellen Aufbau des Druck-oder Kopiergerätes mit der Umdruckstation,
  • Fig. 2 eine zweite Ausführungsform der Einrichtung zur Bewegung des Balkens,
  • Fig.3 ein Stromdiagramm der durch die Elektromagnetanordnung fließenden Ströme, aufgetragen über die Zeit t,
  • Fig.4 die Umdruckstation bei Verwendung eines Bremskörpers,
  • Fig. 5 die Ausführung eines Bremskörpers an der dem Zwischenträger zugewandten Seite,
  • Fig.6 eine zweite Ausführungsform eines Bremskörpers.
It is advantageous that the intermediate carrier comes to a standstill a short time before it comes into contact with the recording medium and is only set back in its running direction a short time after the end of the contact. For this purpose, a brake body can be arranged in the bar, the z. B. from an elastic material or spring-loaded metal block. This brake body protrudes beyond the bar and is arranged adjacent to the record carrier in the bar. If the bar is moved to the intermediate beam, the intermediate beam first hits the brake body and comes to a standstill. In the further course, the bar then presses the intermediate carrier against the recording medium and effects the transfer printing to the intermediate carrier. The brake body is pressed together. When moving in the opposite direction, the brake body brakes the intermediate carrier even if the contact between the intermediate carrier and the recording medium has already been released. It is expedient for the brake body to be fork-shaped on the side facing the intermediate carrier, so that it can only rest on the areas of the intermediate carrier in which the intermediate carrier is not provided with toner. In the following, the invention is further explained on the basis of exemplary embodiments which are shown in the figures. It shows
  • 1 shows a basic structure of the printing or copying machine with the transfer printing station,
  • 2 shows a second embodiment of the device for moving the bar,
  • 3 shows a current diagram of the currents flowing through the electromagnet arrangement, plotted over time t,
  • 4 the transfer station when using a brake body,
  • 5 shows the execution of a brake body on the side facing the intermediate carrier,
  • 6 shows a second embodiment of a brake body.

Aus Figur 1 ergibt sich der prinzipielle Aufbau eines Druckers. Es ist ein ständig umlaufender bandförmiger Zwischenträger 1 vorgesehen, der in Zeilenrichtung eines Aufzeichnungsträgers 6, z. B. einer Papierbahn, vorbeiläuft. Der Zwischenträger 1 wird durch ein von einem Motor angetriebenes Antriebsrad 2 vermittels einer Andruckrolle 3 geführt und ist dabei durch einen Luftspalt 5 vom Aufzeichnungsträger 6 getrennt.The basic structure of a printer results from FIG. There is a continuously rotating band-shaped intermediate carrier 1 is provided, which in the line direction of a recording medium 6, z. B. a paper web. The intermediate carrier 1 is guided by a drive wheel 2 driven by a motor by means of a pressure roller 3 and is separated from the recording medium 6 by an air gap 5.

Der Zwischenträger besteht aus einem elastischen Kunststoff und besitzt auf der dem Aufzeichnungsträger 6 zugewandten Seite eine elektrostatisch aufladbare und elektrostatisch bzw. elektrofotografisch entladbare oder eine magnetisierbare und entmagnetisierbare Schicht. Die zu druckenden Zeichen werden nun mit einem Schreibkopf 7 elektrostatisch bzw. elektrofotografisch bzw. magnetisch auf bekannte Weise erzeugt und in Form von elektrischen oder magnetischen Feldstärkeunterschieden auf dem Zwischenträger 1 gespeichert. In einer Entwicklerstation 8 werden diese Abbildungen mit Toner eingefärbt und in einer Umdruckstation 9 vom Zwischenträger 1 auf den Aufzeichnungsträger 6 übertragen. Hinter der Umdruckstation 9 ist eine rotierende Reinigungsbürste 10 mit einer Absaugeinrichtung angeordnet, die den Zwischenträger von Tonerresten reinigt. In einer anschließenden Entlade- bzw. Entmagnetisierungsstation 11 wird das auf dem Zwischenträger 1 noch gespeicherte elektrostatische bzw. magnetische Bild gelöscht.The intermediate carrier consists of an elastic plastic and has, on the side facing the recording medium 6, an electrostatically chargeable and electrostatically or electrophotographically dischargable or a magnetizable and demagnetizable layer. The characters to be printed are now generated in a known manner using a write head 7 in a known manner and stored in the form of electrical or magnetic field strength differences on the intermediate carrier 1. These images are colored with toner in a developer station 8 and transferred from the intermediate carrier 1 to the recording medium 6 in a transfer printing station 9. Behind the transfer printing station 9 there is a rotating cleaning brush 10 with a suction device which cleans the intermediate carrier from residual toner. In a subsequent discharge or demagnetization station 11, the electrostatic or magnetic image still stored on the intermediate carrier 1 is deleted.

Für die Dauer des Umdruckvorgangs ist 'der Aufzeichnungsträger 6 in Ruhe. Während der Zeit, in der der Zwischenträger 1 mit dem Tonerbild der nächsten zu druckenden Zeile in die Umdruckstation 9 transportiert wird, wird der Aufzeichnungsträger 6 mit einem Zeilenabstand oder um ein Vielfaches davon vorgeschoben. Das auf den Aufzeichnungsträger umgedruckte noch verwischbare Pulverbild wird anschließend in einer Fixierstation, die in Figur 1 nicht dargestellt ist, z. B. mit Hilfe von Wärme und Druck fixiert.The recording medium 6 is at rest for the duration of the transfer printing process. During the time in which the intermediate carrier 1 with the toner image of the next line to be printed is transported into the transfer printing station 9, the recording medium 6 is fed with a line spacing or a multiple thereof. The powder image which can still be blended and is printed on the recording medium is then in a fixing station, which is not shown in FIG. B. fixed with the help of heat and pressure.

Um beim Umdruckvorgang eine direkte Berührung des Zwischenträgers 1 mit dem Aufzeichnungsträger 6 herbeizuführen, wird der Zwischenträger 1 nur sehr kurz mittels eines Balkens 2, der auf der einen Seite des Zwischenträgers angeordnet ist, an den Aufzeichnungsträger angeschlagen. Der Aufzeichnungsträger - stützt sich dabei gegen eine ortsfeste Leiste 13, die auf der anderen Seite des Zwischenträgers angeordnet ist, ab.In order to bring the intermediate carrier 1 into direct contact with the recording medium 6 during the transfer printing process, the intermediate carrier 1 is struck on the recording medium only very briefly by means of a bar 2 which is arranged on one side of the intermediate carrier. The record carrier - is supported against a stationary bar 13, which is arranged on the other side of the intermediate carrier.

Zum Umdruck von Tonerbildern wird der Balken 12 zur Leiste 13 bewegt, und dabei der Zwischenträger 1 mit dem Aufzeichnungsträger 6 in Berührung gebracht. Die Einrichtung zur Bewegung des Balkens 12 zur Leiste 13 kann auf verschiedene Weise aufgebaut sein.For transfer printing of toner images, the bar 12 is moved to the bar 13, and the intermediate carrier 1 is brought into contact with the recording medium 6. The device for moving the bar 12 to the bar 13 can be constructed in various ways.

Eine erste Ausführung dieser Einrichtung ist in Figur 1 dargestellt. Dazu sind mindestens zwei Elektromagneten 14 vorgesehen, deren Anker 22 an dem Balken 12 befestigt sind. Soll der Balken 12 zur Leiste 13 bewegt werden, werden diese Magnete 14 erregt, die Anker 22 werden in die Magnete 14 hineingezogen, wobei der Balken 12 in Richtung zur Leiste 13 geführt wird. Nach Abschalten der Erregung der Elektromagnete 14 wird der Balken 12 mit Hilfe von Federn 15 wieder in seine Ruhelage zurückgeholt.
In einer weiteren Ausführungsform besteht die Einrichtung zur Bewegung des Balkens 12 aus mindestens zwei Elektromagnetanordnungen. Jede Elektromagnetanordnung setzt sich aus einem Andruckmagneten 16, einem Rückholmagneten 17 und einem an den Balken 12 angelenkten gemeinsamen Anker 18 zusammen (Fig.2). Im Ruhezustand werden die Rückholmagneten 17 von einem schwachen Strom I 17 durchflossen (Fig.3). Soll das Tonerbild vom Zwischenträger auf den Aufzeichnungsträger übertragen werden, so wird unter gleichzeitigem Abschalten des Stromes für die Rückholmagnete 17 ein Stomimpuls 16 von solcher Dauer auf die Andruckmagnete 16 gegeben, daß der Balken 12 sicher zum Anschlag an den Aufzeichnungsträger und die ortsfeste Leiste kommt. Nach Beendigung des Stromimpulses 1 16 für die Andruckmagneten 16 wird den Rückholmagneten 17 ein Stromimpuls zugeleitet; und die Rückholmagnete holen den Balken wieder in die Ruhelage zurück. Nach der für den Rückholvorgang erforderlichen Dauer wird der die Rückholmagnete 17 durchfließende Strom I 17 wieder auf einen kleineren Wert vermindert, der zum Festhalten des Balkens 12 in der Ruhelage ausreichend ist.A first embodiment of this device is shown in FIG. 1. For this purpose, at least two electromagnets 14 are provided, the armatures 22 of which are fastened to the beam 12. If the bar 12 is to be moved to the bar 13, these magnets 14 are excited, the armatures 22 are drawn into the magnets 14, the bar 12 being guided in the direction of the bar 13. After the excitation of the electromagnets 14 has been switched off, the bar 12 is brought back into its rest position by means of springs 15.
In a further embodiment, the means for movement of the beam 12 of at least two Elektromagnetanordnun g s. Each electromagnet arrangement is composed of a pressure magnet 16, a return magnet 17 and a common armature 18 articulated on the bar 12 (FIG. 2). In the idle state, the return magnets 17 are traversed by a weak current I 17 (FIG . 3). If the toner image is to be transferred from the intermediate carrier to the recording medium, a current pulse 16 of such duration is given to the pressing magnets 16 while simultaneously switching off the current for the return magnets 17 that the bar 12 securely comes to a stop against the recording medium and the stationary bar. After completion of the current pulse 1 16 for the pressure magnets 16, a return pulse is fed to the return magnets 17; and the return magnets bring the beam back into the rest position. After that for the The necessary duration of the return process, the current I 17 flowing through the return magnets 17 is reduced again to a smaller value, which is sufficient to hold the bar 12 in the rest position.

Mit der in Figur 2 und 3 erläuterten Elektromagnetanordnung lassen sich besonders kurze Anzugs- und Abfallzeiten erreichen. Damit ist es möglich, die Berührungsdauer zwischen Zwischenträger und Aufzeichnungsträger kurz zu halten.With the electromagnet arrangement explained in FIGS. 2 and 3, particularly short pull-in and drop-out times can be achieved. This makes it possible to keep the contact time between the intermediate carrier and the recording medium short.

Der im Bereich des Balkens befindliche Teil des Zwischenträgers 1 kommt während des Anschlagens kurzzeitig zum Stillstand, während die übrige Länge des Zwischenträgers 1 durch das Antriebsrad 2 weiterbewegt wird. Dabei wird zwangläufig der Teil des Zwischenträgers 1, der sich zwischen dem rechten Ende des Balkens 12 und dem Antriebsrad 2 befindet, gedehnt, während der zwischen dem linken Ende des Balkens 12 und dem Antriebsrad 2 befindliche Teil des Zwischenträgers entspannt wird. Der Zwischenträger muß aus diesem Grunde genügend elastisch sein, so daß beim Spannen und Entspannen des Zwischenträgers keine Beschädigung des Zwischenträgers auftreten kann. Kunststoffmaterialien, die diese Anforderung erfüllen, sind aber bekannt (z. B. Poly- äthylenenterephthalat).The part of the intermediate carrier 1 located in the area of the bar comes to a brief standstill during the striking, while the remaining length of the intermediate carrier 1 is moved further by the drive wheel 2. The part of the intermediate carrier 1 which is located between the right end of the beam 12 and the drive wheel 2 is inevitably stretched, while the part of the intermediate carrier located between the left end of the beam 12 and the drive wheel 2 is relaxed. For this reason, the intermediate carrier must be sufficiently elastic so that no damage to the intermediate carrier can occur when the intermediate carrier is tensioned and relaxed. However, plastic materials that meet this requirement are known (e.g. polyethylene terephthalate).

Es ist zweckmäßig, den am Umdruckvorgang beteiligten Teil des Zwischenträgers bereits eine kurze Zeit vor seiner Berührung mit dem Aufzeichnungsträger zum Stillstand zu bringen und erst eine kurze Zeit nach der Beendigung der Berührung wieder in seiner Laufrichtung in Bewegung zu setzen. Dadurch werden bei hoher Druckgeschwindigkeit mögliche Verwischungen des Tonerbildes, die in der Übergangsphase zwischen Nichtberührung und Berührung durch Schlupf des Zwischenträgers gegenüber dem Aufzeichnungsträger auftreten könnten, vermieden. Um dies zu erreichen, kann in der Leiste 20 ein Bremskörper angeordnet werden, der benachbart zum Aufzeichnungsträger 6 angeordnet ist und der im Ruhezustand über die Oberfläche des Aufzeichnungsträgers hinausragt.It is expedient to bring the part of the intermediate carrier involved in the transfer printing process to a standstill a short time before it comes into contact with the recording medium and to set it in motion again only a short time after the end of the contact. This avoids possible blurring of the toner image at high printing speed, which could occur in the transition phase between non-contact and contact due to slippage of the intermediate carrier relative to the recording medium. To achieve this, a brake body can be arranged in the strip 20, which is arranged adjacent to the recording medium 6 and which, in the idle state, projects beyond the surface of the recording medium.

Ein erstes Ausführungsbeispiel eines solchen Bremskörpers ergibt sich aus Figur 4. Dort ist ein Bremskörper 19 aus elastischem Material, z. B. Kunststoff, so in der Leiste 20 gelagert, daß er im Ruhezustand über die Oberfläche des Aufzeichnungsträgers 6 hinausragt. Beim Andrücken des Balkens 12 bekommt der Bremskörper 19 Kontakt mit dem Zwischenträger 1 und bremst diesen bis zum Stillstand ab, noch bevor der Balken sich bei fortschreitendem Andruckvorgang an den Aufzeichnungsträger 6 angelegt hat. Entsprechend wird beim Wegbewegen des Balkens die Bremsung des Zwischenträgers 1 noch so lange beibehalten, bis ein Luftspalt zwischen Aufzeichnungsträger und Zwischenträger entstanden ist und eine Verwischung somit vermieden wird.A first embodiment of such a brake body results from FIG. 4. There is a brake body 19 made of elastic material, e.g. B. plastic, so stored in the bar 20 that it projects beyond the surface of the recording medium 6 in the idle state. When the bar 12 is pressed, the brake body 19 comes into contact with the intermediate carrier 1 and brakes it to a standstill before the bar has placed itself against the recording medium 6 as the pressing process progresses. Accordingly, when the bar is moved away, the braking of the intermediate carrier 1 is maintained until an air gap has formed between the recording medium and the intermediate carrier and blurring is thus avoided.

Eine zweite Ausführungsform des Bremskörpers zeigt Figur 6. Hier dient als Bremskörper ein Metallklotz 21, der in der Leiste 22 federnd gelagert ist.A second embodiment of the brake body is shown in FIG. 6. A metal block 21, which is resiliently mounted in the strip 22, serves as the brake body.

Zweckmäßig ist es, die dem Zwischenträger zugewandte Seite der Bremskörper 19, 21 gabelförmig auszubilden. Eine solche Ausführung ist in Figur 5 dargestellt. Hier ist ein Schnitt durch den Bremskörper 19 der Figur 24 gezeigt, aus dem sich ergibt, daß sich der Bremskörper 19 beim Umdruckvorgang nur an die Bereiche des Zwischenträgers 1 anlegt, die nicht mit Toner versehen sind. Eine Verwischung des Tonerbildes durch den Bremskörper wird damit vermieden.It is expedient to design the side of the brake bodies 19, 21 facing the intermediate carrier in a fork-shaped manner. Such an embodiment is shown in FIG. 5. Here, a section through the brake body 19 of FIG. 24 is shown, from which it follows that the brake body 19 during the transfer printing process only contacts the areas of the intermediate carrier 1 which are not provided with toner. This prevents the toner from blurring the toner image.

Zur Unterstützung des Umdruckvorgangs kann zwischen dem Balken 12 und der ortsfesten Leiste 13 eine elektrische Spannung oder ein Magnetfeld gelegt werden, wodurch auf den Toner in Richtung des Aufzeichnungsträgers 6 eine Anziehungskraft ausgeübt wird.To support the transfer printing process, an electrical voltage or a magnetic field can be applied between the bar 12 and the fixed bar 13, as a result of which an attractive force is exerted on the toner in the direction of the recording medium 6.

Claims (11)

1. Device for transferring toner characters applied to a constantly rotating strip-like intermediate carrier to a data carrier, in particular for printers and copiers, characterised in that the intermediate carrier (1) cosists of elastic material and mechanical means are provided which ensure that during the transfer printing process the side of the intermediate carrier (1) to which the toner is applied comes into contact with the data carrier (6), at which time the area of the intermediate carrier provided for the transfer printing temporarily comes to a halt.
2.Device as claimed in Claim 1, characterised by mechanicla means consists of a stationary strip (13) which is arranged on one side of the intermediate carrier (1) and of a bar (12) which can be moved at right angles to the direction of movement of the intermediate carrier (1) by means of a device and which is arranged on the other side of the intermediate carrier.
3. Device as claimed in Claim 2, characterised in that the bar is arranged on that side of the intermediate carrier (1) which does not bear the toner and that the data carrier (6) bears against the strip (13).
4. Device as claimed in Claim 2 or 3, characterised by a device for moving the bar composed of at least two electromagnets (14) whose armature (22) is attached to the bar (12), and of tension springs (15) which are secured to the bar and which return the bar to the rest position following its transfer printing motion.
5. Device as claimed in Claim 2 or 3, characterised in that the device which serves to move the bar (12) provides at least two electromagnet arrangements, that each electromagnet arrangement consists of a pressure magnet (16), a return magnet (17) and an armature (18) which is connected to the bar (12) and is common to one pressure magnet and one return magnet, that the movement of the bar towards the intermediate carrier (1) is produced in that a first current pulse (l 16) is supplied to the pressure magnet (16), that for the return process the return magnet (17) is supplied with a second current pulse (17), and that the bar is maintained in the rest position in that a current which is small in magnitude relative to the second current pulse flows through the return magnet.
6. Device as claimed in one of the preceding Claims, characterised in that a device is provided which brings that area of the intermediate carrier provided for the transfer printing process to a halt prior to the contact with the data carrier, and the stationary state is discontinued following the separation of the two carriers.
7. Device as claimed in Claim 6, characterised by a device in the form of braking body (19) which consists of elastic material, which is mounted at the edge of the strip (20) adjacent to the data carrier (6) and which in the rest state projects beyond the data carrier which bears against the strip.
8. Device as claimed in Claim 6, characterised by a device in the form of a braking body composed of a spring mounted metal block (21) which is arranged at the edge of the strip (22) adjacent to the data carrier (6) and which in the rest state projects beyond the data carrier which bears against the strip.
9. Device as claimed in one of the Claims 6 to 8, characterised in that the braking body (19, 21) is fork-shaped on the side facing towards the intermediate carrier only in those areas in which the intermediate carrier is not provided with toner.
10. Device as claimed in one of the preceding Claims, characterised in that an electric voltage is connectected between the bar (12) and the strip (13).
11. Device as claimed in one of the Claims 1 to 9, characterised in that a magnetic field is produced between the bar (12) and the strip (13).
EP78101199A 1977-11-11 1978-10-23 Apparatus for transferring powder symbols from a permanently circulating intermediate web onto a recording web Expired EP0001987B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2750612 1977-11-11
DE2750612A DE2750612C3 (en) 1977-11-11 1977-11-11 Device for transferring a toner image from a circumferential, belt-shaped image carrier to an image receiving material

Publications (2)

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EP0001987A1 EP0001987A1 (en) 1979-05-30
EP0001987B1 true EP0001987B1 (en) 1981-04-29

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EP78101199A Expired EP0001987B1 (en) 1977-11-11 1978-10-23 Apparatus for transferring powder symbols from a permanently circulating intermediate web onto a recording web

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US (1) US4217819A (en)
EP (1) EP0001987B1 (en)
JP (1) JPS5476235A (en)
AT (1) AT360339B (en)
CA (1) CA1128815A (en)
DE (1) DE2750612C3 (en)
IT (1) IT1100458B (en)

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Also Published As

Publication number Publication date
CA1128815A (en) 1982-08-03
DE2750612B2 (en) 1980-03-27
DE2750612A1 (en) 1979-05-17
IT7829546A0 (en) 1978-11-08
JPS5476235A (en) 1979-06-18
US4217819A (en) 1980-08-19
EP0001987A1 (en) 1979-05-30
IT1100458B (en) 1985-09-28
ATA734078A (en) 1980-05-15
AT360339B (en) 1980-01-12
DE2750612C3 (en) 1980-11-27

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