EP0001987B1 - Appareil pour transférer des symboles de poudre déposés sur un porteur intermédiaire effectuant des mouvements permanents sur un porteur d'enregistrement - Google Patents

Appareil pour transférer des symboles de poudre déposés sur un porteur intermédiaire effectuant des mouvements permanents sur un porteur d'enregistrement 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
Other languages
German (de)
English (en)
Other versions
EP0001987A1 (fr
Inventor
Wolfgang Von Tluck
Bernhard Schlageter
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0001987A1 publication Critical patent/EP0001987A1/fr
Application granted granted Critical
Publication of EP0001987B1 publication Critical patent/EP0001987B1/fr
Expired legal-status Critical Current

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Classifications

    • 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)

Claims (11)

1. Dispositif pour réaliser le report de signes formés de toner, déposés sur un support intermédiaire en forme de bande circulant en permanence, sur un support d'enregistrement, notamment pour des appareils d'impression et de reprographie, caractérisé par le fait que le support intermédiaire (1) est constitué en un matériau élastique et qu'il est prévu des moyens mécaniques grâce auxquels, pendant l'opération de report, le support intermédiaire (1) est amené en contact, par sa face recouverte de toner, avec le support d'enregistrement (6). tandis que la zone de support intermédiaire, qui est prévue pour le report, est mise à l'arrêt pendant un bref intervalle de temps.
2. Dispositif suivant la revendication 1, caractérisé par des moyens mécaniques constitués par une réglette fixe (13), qui est disposée sur une face du support intermédiaire (1) et par une barre (12) déplaçable perpendiculairement au sens de déplacement du support intermédiaire (1) au moyen d'un dispositif qui est disposé sur l'autre face du support intermédiaire.
3. Dispositif suivant la revendication 2, caractérisé par le fait que la barre (12) est disposée du côte, non recouvert de toner, du support intermédiaire (1) et que le support d'enregistrement (6) est appliqué contre la réglette (13).
4. Dispositif suivant l'une des revendications 2 ou 3, caractérisé par un dispositif permettant de déplacer la barre, constitué par au moins deux électroaimants (14), dont l'armature (22) est fixée à la barre (12), et par des ressorts de traction (15) fixés sur la barre et qui ramènent la barre dans sa position de repos après son déplacement pour le report.
5. Dispositif suivant la revendication 2 ou 3, caractérisé par le fait que le dispositif destiné à déplacer la barre (12) comporte au moins deux systèmes à électroaimant, que chaque système à électroaimant est constitué par un solénoïde de pression (16), un solénoïde rappel (17) et une armature (18) reliée à la barre (12) et commune à un solénoïde de pression et à un solénoïde de rappel, que pour la réalisation du déplacement de la barre en direction du support intermédiaire (1), une première impulsion de courant (116) est envoyée au solénoïde de pression (16), que pour le processus de rappel, une seconde impulsion de courant (17) est envoyée au solénoïde de rappel (17), et que pour bloquer la barre dans sa position de repos, un courant, faible par rapport à la seconde impulsion de courant, circule dans le solénoïde de rappel.
6. Dispositif suivant l'une des revendications précédentes, caractérisé par le fait qu'il est prévu un dispositif grâce auquel la zone, prévue pour le report, du support intermédiaire est mise à l'arrêt avant l'établissement du contact avec le support d'enregistrement et que l'état d'arrêt est supprimé après séparation des deux supports.
7. Dispositif suivant la revendication 6, caractérisé par un dispositif réalisé sous la forme d'un corps de freinage (19) en matériau élastique, qui est monté sur le bord de la réglette (20) au voisinage du support d'enregistrement (6) et qui, à l'état de repos, fait saillie au-dessus du support d'enregistrement appliqué contre la réglette.
8. Dispositif suivant la revendication 6, caractérisé par un dispositif réalisé sous la forme d'un corps de freinage formé par un patin métallique (21) monté de façon élastique et qui est disposé sur le bord de la réglette (22) au voisinage du support d'enregistrement (6) et qui, à l'état de repos, fait saillie au-dessus du support d'enregistrement appliqué contre la réglette.
9. Dispositif suivant l'une des revendications 6 à 8, caractérisé par le fait que le corps de freinage (19, 21) est réalisé en forme de fourche sur son côté tourné vers le support intermédiaire (1), de sorte qu'il s'applique sungle support intermédiaire uniquement dans des zones dans lesquelles ce dernier ne comporte pas de toner.
10. Dispositif suivant l'une des revendications précédentes, caractérisé par le fait qu'une tension électrique est appliquée entre la barre (12) et la réglette (13).
11. Dispositif suivant l'une quelconque ries revendications 1à 9, caractérisé par le fait qu'un champ magnétique est produit entre la barre (12) et la réglette (13).
EP78101199A 1977-11-11 1978-10-23 Appareil pour transférer des symboles de poudre déposés sur un porteur intermédiaire effectuant des mouvements permanents sur un porteur d'enregistrement Expired EP0001987B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2750612 1977-11-11
DE2750612A DE2750612C3 (de) 1977-11-11 1977-11-11 Vorrichtung zum Übertragen eines Tonerbildes von einem umlaufenden, bandförmigen Bildträger auf ein Bildempfangsmaterial

Publications (2)

Publication Number Publication Date
EP0001987A1 EP0001987A1 (fr) 1979-05-30
EP0001987B1 true EP0001987B1 (fr) 1981-04-29

Family

ID=6023582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78101199A Expired EP0001987B1 (fr) 1977-11-11 1978-10-23 Appareil pour transférer des symboles de poudre déposés sur un porteur intermédiaire effectuant des mouvements permanents sur un porteur d'enregistrement

Country Status (7)

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

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55100582A (en) * 1979-01-25 1980-07-31 Ricoh Co Ltd Toner image transferring method
US4393389A (en) * 1981-01-26 1983-07-12 Wang Laboratories, Inc. Magnetic toner transfer method and apparatus
US4410896A (en) * 1981-04-13 1983-10-18 Wang Laboratories, Inc. Apparatus for preventing removal of toner from transferred images
US4392179A (en) * 1981-07-09 1983-07-05 Wang Laboratories, Inc. Apparatus and method for separating adhering media electrostatically
US4467335A (en) * 1982-05-07 1984-08-21 Data Card Corporation System for forming an image on the surface of a plastic card
US4855784A (en) * 1987-12-21 1989-08-08 Olin Hunt Specialty Products Inc. Web backing plate
JP3057723B2 (ja) * 1990-07-10 2000-07-04 沖電気工業株式会社 電子写真プリンタ
US5012290A (en) * 1990-08-01 1991-04-30 Xerox Corporation Increased transference of a toner image on to a copy sheet by using a zero tension loop applied after corotron transfer
JPH04292999A (ja) * 1991-03-22 1992-10-16 Ricoh Co Ltd 画像形成装置
JPH05216382A (ja) * 1992-02-04 1993-08-27 Fuji Xerox Co Ltd 無端ベルト搬送装置
JPH0671936A (ja) * 1992-08-26 1994-03-15 Sony Corp プリント装置及びレーザーダイオード駆動装置
US5737669A (en) * 1995-06-07 1998-04-07 Oki America, Inc. Monochrome/multichrome band printer
AT404919B (de) * 1997-08-18 1999-03-25 Peter Zimmer Keg Reinigungsvorrichtung
DE19938447B4 (de) * 1999-08-13 2005-08-11 Schott Ag Druckvorrichtung

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US3285168A (en) * 1963-05-07 1966-11-15 Crocker Citizens Nat Bank Powder image transfer system
DE1497238A1 (de) * 1965-09-08 1969-05-14 Siemens Ag Verfahren zum zeilenweisen Aufzeichnen von Zeichen auf einen blattfoermigen Aufzeichnungstraeger
US3495268A (en) * 1966-03-15 1970-02-10 Mohawk Data Sciences Corp Continuously moving endless band non-impact transfer printer
FR96354E (fr) * 1967-12-22 1972-06-16 Int Standard Electric Corp Perfectionnements aux machines imprimantes.
US3697160A (en) * 1969-04-30 1972-10-10 Xerox Corp Continuous imaging apparatus
US3644034A (en) * 1970-12-16 1972-02-22 Eastman Kodak Co Belt transfer device
DE2106259A1 (de) * 1971-02-10 1972-08-24 Philips Patentverwaltung Verfahren und Einrichtungen zum Übertragen elektrographisch erzeugter Pulverbilder
US3893761A (en) * 1972-11-02 1975-07-08 Itek Corp Electrophotographic toner transfer and fusing apparatus
US4110024A (en) * 1976-05-14 1978-08-29 Xerox Corporation Transfer assembly for electrostatic transfer of a toner image from a curvilinear recording surface
GB1544050A (en) * 1976-06-16 1979-04-11 Fuji Photo Film Co Ltd Marking apparatus
DE2636326C3 (de) * 1976-08-12 1979-02-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Vorrichtung zum An- und Abschwenken eines Aufzeichnungsträgers zu und von einem Zwischenträger
US4114536A (en) * 1976-08-26 1978-09-19 Ricoh Co., Ltd. Method of and apparatus for transfer printing a toner image

Also Published As

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

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