EP1990692A1 - Device for impact-free magnetographic printing ensuring reduced fouling of the device - Google Patents

Device for impact-free magnetographic printing ensuring reduced fouling of the device Download PDF

Info

Publication number
EP1990692A1
EP1990692A1 EP08290425A EP08290425A EP1990692A1 EP 1990692 A1 EP1990692 A1 EP 1990692A1 EP 08290425 A EP08290425 A EP 08290425A EP 08290425 A EP08290425 A EP 08290425A EP 1990692 A1 EP1990692 A1 EP 1990692A1
Authority
EP
European Patent Office
Prior art keywords
transfer roller
printing apparatus
contact
roller
magneto
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.)
Withdrawn
Application number
EP08290425A
Other languages
German (de)
French (fr)
Inventor
Nathalie Lapouge
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.)
Nipson Sas
Original Assignee
Nipson Sas
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 Nipson Sas filed Critical Nipson Sas
Publication of EP1990692A1 publication Critical patent/EP1990692A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography
    • 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
    • G03G15/167—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 at least one of the recording member or the transfer member being rotatable during the transfer
    • G03G15/168—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 at least one of the recording member or the transfer member being rotatable during the transfer with means for conditioning the transfer element, e.g. cleaning

Definitions

  • the present invention relates to the field of non-impact magneto-graphical printing apparatus and more particularly to the field of non-impact magneto-graphical printing apparatus cleaning devices.
  • the printing apparatus comprises a print drum on which information to be printed on a substrate is recorded as electromagnetic charges. The positioning of this information on the drum is done through the intervention of writing heads. The toner, formed by the inversely charged toner powder, is then distributed on this drum to adhere only where the drum has been marked by writing heads.
  • the substrate to be printed then passes between the printing drum and a transfer roller.
  • the transfer roller is highly electrostatically charged so that the toner magnetically attached to the drum is attracted by the electric charge of the transfer roller against the substrate.
  • the toner is thus deposited on the substrate according to the positioning of the electromagnetic information recorded on the drum by the writing heads.
  • the printing becomes final once the ink deposited on the substrate undergoes a heating step by a suitable device.
  • the transfer roller At the region of the transfer roller where the printing takes place and which is not in contact with the substrate, the transfer roller is then in proximity, or even in contact with, the printing drum which presents this level a very weak layer of toner.
  • the electric field of the transfer roller then attracts toner particles which accumulate gradually during successive impressions. Direct friction of the transfer roller against the print drum increases this accumulation and compact the accumulated toner.
  • this accumulation of ink on the surface of the transfer roller can propagate in the form of dust to the rest of the apparatus and in particular cause a fouling, for example, writing heads.
  • the present invention aims to overcome one or more disadvantages of the prior art and in particular to provide a magneto-graphic printing apparatus comprising a device for on the one hand to limit its fouling by toner particles, and to on the other hand to maintain an impression of quality.
  • a non-impact magneto-graphical printing apparatus comprising a magnetic printing drum fed with toner from an ink tank on which information is recorded by at least one magnetic writing head to retain the toner in the written areas of the drum, a toner transfer roller on a substrate positioned between the magnetic drum and the transfer roller, arranged in parallel axes, characterized in that the printing apparatus comprises at least one printing device.
  • the cleaning device comprising a means for scraping the surface of the transfer roller, formed by a flexible blade, to take off from the roll and recover the majority of the toner particles which have not been fixed to the substrate, this scraper means bearing against the surface of the transfer roller downstream of the contact area of the transfer roller with the substrate relative to the direction of rotation of the transfer roller about its axis.
  • the magneto-graphical printing apparatus is characterized in that the means for scraping the surface of the transfer roller is formed by a blade associated with a means for adjusting the angle of rotation. tilting the blade relative to the tangent of the transfer roller at the point of contact of the blade with the surface of the transfer roller.
  • the magneto-graphic printing apparatus is characterized in that the means for scraping the surface of the transfer roller is formed by a curved blade whose edge bears against the transfer roller. is substantially tangent with the surface of the transfer roller at the point of contact of the blade with the roller, and whose edge opposite the edge of the blade in contact with the transfer roller, forms a non-zero angle with the perpendicular to the tangent to the surface of the transfer roller at the point of contact of the blade with the roller.
  • the magneto-graphical printing apparatus is characterized in that the edge opposite the edge of the scraper means in contact with the transfer roller forms with the perpendicular to the tangent to the surface of the transfer roller at the level from the point of contact of the scraping means with the roller, an angle of between 5 and 60 degrees.
  • the magneto-graphical printing apparatus is characterized in that the cleaning device comprises a means for recovering the detached toner particles by the scraping means formed by a suction means.
  • the magneto-graphic printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned at the edge of the scraper means in contact with each other. with the surface of the transfer roller.
  • the magneto-graphic printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned opposite the edge of the means. scraper in contact with the surface of the transfer roller, and along an axis substantially parallel to the axis of the elongate edge of the scraper means in contact with the surface of the transfer roller.
  • the magneto-graphical printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned at a distance from the transfer roller between 0 , 2 and 5 mm.
  • the magneto-graphical printing apparatus is characterized in that the suction means provides a vacuum at the suction nozzle inlet of between 0.07 and 6 kilo pascals.
  • the device of the present invention is intended for all non-impact magneto-graphical printing apparatus which may be both printers and photocopiers.
  • the magneto-graphic printing apparatus comprises at least one magnetic printing drum (2) forming a cylinder on the surface of which one or more write heads record information to be printed.
  • This drum (2) is disposed along an axis parallel to the axis of a transfer roller (1) with which it is in contact.
  • the two cylinders formed by the drum (2) and the transfer roller (1) rotate respective axially in opposite directions by rolling their surface against each other.
  • the substrate (3) intended to be the medium of the printing is thus positioned between the two rollers (1 and 2) which ensure, among other things, its training in the apparatus.
  • This cleaning device comprises a scraper means (4) positioned against the surface of the transfer roller.
  • This scraping means (4) thus forms a blade whose scraping edge (4a) bears against an area of the transfer roller (1) located downstream from the contact zone between the printing drum (2) and the transfer roller or the area of the transfer roller (1) where the printing is carried out, that is to say the transfer of the toner on the substrate (3), with respect to the direction of the axial rotation of the transfer roller (1).
  • the scraping edge (4a) of this blade (4) is thus in contact with the transfer roller (2) while the edge (4b) of the blade (4) which is opposite to it is fixed to a means of the structure of the machine.
  • the scraper means (4) is generally metallic, preferably aluminum or an alloy comprising aluminum, but may be made of any other suitable material.
  • the edge (4b) of the blade (4) attached to the machine is mounted on an adjustment means for defining the angle of inclination of the blade relative to the perpendicular to the tangent to the level of the point of contact of the scraper edge (4a) of the blade (4) with the transfer roller (1).
  • the inclination of the blade then remains effective when the angle is between 5 and 60 °.
  • An alternative embodiment is to use a flexible blade so that when the scraper edge (4a) is pressed against the surface of the transfer roller (1), the blade (4) curves. This curvature allows the level of the scraper edge (4a) to recover the toner remaining on the transfer roller (1), and guide these detached ink particles to a recovery means (5).
  • a flexible blade (4) has the advantage of being able to overcome variations in the surface of the transfer roller (1) and to adapt to any variations in the gap between the surface of the roller transfer (1) in rotation and the fixed structure which supports the blade (4), while remaining tangent to the surface of the transfer roller (1).
  • the recovery means (5) of the toner particles detached from the transfer roller (1) is formed by a suction device which has a suction nozzle (5a) located near the scraper means (4) against the surface of the transfer roller (1).
  • this suction nozzle (5a) is positioned at the scraper edge (4a) of the blade (4) so as to recover the toner particles as soon as they are detached from the surface of the transfer roller. (1).
  • the middle of the orifice of the suction nozzle (5a) is then aligned with the axis of the transfer roller and the scraper edge (4a) of the blade (4) against the surface of the transfer roller (1). .
  • the suction nozzle (5a) when the blade (4) is curved, can be positioned near the fixed edge (4b) of the blade (4).
  • the suction nozzle (5a) is then oriented along an axis parallel to the axis of the blade (4) at its fixed edge (4b).
  • Such positioning of the suction nozzle (5a) makes it possible to create a suction stream which runs along the entire curved surface of the blade (4) from the scraper edge (4a) to the fixed edge (4b).
  • This suction stream being parallel to the axis of the blade (4) at its scraper edge (4a), takes advantage of the rotation of the transfer roller (1) which propels in the direction of the sucking the toner particles off the roll (1).
  • the distance between the suction nozzle (5a) and the surface of the transfer roller (1) is between 0.2 and 7 mm.
  • the depression that is achieved at the orifice of the nozzle (5a) is between 0.05 and 6 hPa.

Landscapes

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

Abstract

The device has a cleaning device for cleaning a transfer roller (1). The cleaning device has a scraping unit (4) positioned against a surface of the roller and formed of a curved spring blade for scraping the surface of the roller to unfasten the roller and to recover majority of particles of toner which are not fixed to a substrate (3). The scraping unit is supported against the surface of the roller in downstream of a contact zone of the roller with the substrate with respect to the rotational direction of the roller around its axis.

Description

La présente invention se rapporte au domaine des appareils d'impression magnéto-graphique non-impact et plus particulièrement au domaine des dispositifs de nettoyage des appareils d'impression magnéto-graphique non-impact.The present invention relates to the field of non-impact magneto-graphical printing apparatus and more particularly to the field of non-impact magneto-graphical printing apparatus cleaning devices.

Les appareils faisant intervenir la technologie magnéto-graphique non-impact pour des impressions utilisent une encre en poudre composée de fines particules, de résines et divers pigments magnétiques appelée toner. L'appareil d'impression comprend un tambour d'impression sur lequel les informations destinées à être imprimées sur un substrat sont enregistrées sous la forme de charges électromagnétiques. Le positionnement de ces informations sur le tambour est effectué grâce à l'intervention de têtes d'écriture. Le toner, formé par l'encre en poudre inversement chargée, est ensuite répartie sur ce tambour pour ne venir adhérer que là où le tambour a été marqué par têtes d'écritures.Devices using non-impact magneto-graphical technology for prints use powdered ink composed of fine particles, resins, and various magnetic pigments called toner. The printing apparatus comprises a print drum on which information to be printed on a substrate is recorded as electromagnetic charges. The positioning of this information on the drum is done through the intervention of writing heads. The toner, formed by the inversely charged toner powder, is then distributed on this drum to adhere only where the drum has been marked by writing heads.

Le substrat destiné à être imprimé passe alors entre le tambour d'impression et un rouleau de transfert. Le rouleau de transfert est fortement chargé électro-statiquement de sorte que le toner fixé magnétiquement sur le tambour, se trouve attiré grâce à la charge électrique du rouleau de transfert contre le substrat. Le toner vient ainsi se déposer sur le substrat selon le positionnement des informations électromagnétiques enregistrées sur le tambour par les têtes d'écritures. L'impression ne devient définitive qu'une fois que l'encre déposée sur le substrat connaît une étape de chauffage par un dispositif adapté.The substrate to be printed then passes between the printing drum and a transfer roller. The transfer roller is highly electrostatically charged so that the toner magnetically attached to the drum is attracted by the electric charge of the transfer roller against the substrate. The toner is thus deposited on the substrate according to the positioning of the electromagnetic information recorded on the drum by the writing heads. The printing becomes final once the ink deposited on the substrate undergoes a heating step by a suitable device.

Une telle technologie permet des impressions sur une large diversité de substrats (papier, carton, carton plastifié, etc.) avec de grandes vitesses d'impression. Cependant, il convient de remarquer que le rouleau de transfert du toner des appareils d'impression présente généralement une largeur fixe supérieure à la largeur maximum autorisée du substrat utilisé. Cette caractéristique technique des appareils d'impression utilisant la technologie magnéto-graphique est alors à l'origine de plusieurs problèmes.Such technology allows printing on a wide variety of substrates (paper, cardboard, laminated cardboard, etc.) with high print speeds. However, it should be noted that the toner transfer roller of the printing apparatus generally has a fixed width greater than the maximum allowed width of the substrate used. This technical characteristic of printing devices using magneto-graphic technology is then at the root of several problems.

Au niveau de la zone du rouleau de transfert où s'effectue l'impression et qui ne se trouve pas en contact avec le substrat, le rouleau de transfert se trouve alors à proximité, voire en contact avec le tambour d'impression qui présente à ce niveau une couche très faible de toner. Le champ électrique du rouleau de transfert attire alors des particules de toner qui viennent s'accumuler progressivement au cours des impressions successives. Un frottement direct du rouleau de transfert contre le tambour d'impression augmente cette accumulation et compacte le toner accumulé. En plus d'altérer l'efficacité du fonctionnement du rouleau de transfert, cette accumulation d'encre sur la surface du rouleau de transfert peut se propager sous forme de poussières au reste de l'appareil et être notamment à l'origine d'un encrassement, par exemple, des têtes d'écritures.At the region of the transfer roller where the printing takes place and which is not in contact with the substrate, the transfer roller is then in proximity, or even in contact with, the printing drum which presents this level a very weak layer of toner. The electric field of the transfer roller then attracts toner particles which accumulate gradually during successive impressions. Direct friction of the transfer roller against the print drum increases this accumulation and compact the accumulated toner. In addition to impairing the efficiency of the operation of the transfer roller, this accumulation of ink on the surface of the transfer roller can propagate in the form of dust to the rest of the apparatus and in particular cause a fouling, for example, writing heads.

De plus, lorsque le substrat a déjà connu une pré-impression, une affinité physico-chimique peut se réaliser entre l'élastomère qui recouvre la surface du rouleau de transfert et la résine du toner. Cette affinité entraîne alors la formation d'un dépôt de toner non-homogène sur la surface du rouleau. Cette surépaisseur d'encre diminue alors fortement le transfert du toner sur le papier sous l'action d'un champ électrostatique, ce qui influe sur la qualité du transfert et donc la qualité de l'impression.In addition, when the substrate has already experienced pre-printing, a physicochemical affinity can be achieved between the elastomer which covers the surface of the transfer roller and the resin of the toner. This affinity then causes the formation of a non-homogeneous toner deposit on the surface of the roll. This extra ink greatly reduces the transfer of toner on the paper under the action of an electrostatic field, which affects the quality of the transfer and therefore the quality of printing.

La présente invention a pour objet de palier un ou plusieurs inconvénients de l'art antérieur et notamment de proposer un appareil d'impression magnéto-graphique comprenant un dispositif permettant d'une part de limiter son encrassement par des particules du toner, et d'autre part de maintenir une impression de qualité.The present invention aims to overcome one or more disadvantages of the prior art and in particular to provide a magneto-graphic printing apparatus comprising a device for on the one hand to limit its fouling by toner particles, and to on the other hand to maintain an impression of quality.

Cette objectif est atteint grâce à un appareil d'impression magnéto-graphiques non-impact comprenant un tambour d'impression magnétique alimenté en toner depuis un réservoir d'encre sur lequel des informations sont enregistrées par au moins une tête d'écriture magnétique pour retenir le toner dans les zones écrites du tambour, un rouleau de transfert du toner sur un substrat positionné entre le tambour magnétique et le rouleau de transfert, disposés selon des axes parallèles, caractérisé en ce que l'appareil d'impression comprend au moins un dispositif de nettoyage du rouleau de transfert, le dispositif de nettoyage comprenant un moyen de raclement de la surface du rouleau de transfert, formé par une lame souple, pour décoller du rouleau et récupérer la majorité des particules de toner qui ne se sont pas fixées au substrat, ce moyen de raclement se trouvant en appui contre la surface du rouleau de transfert en aval de la zone de contact du rouleau de transfert avec le substrat par rapport au sens de rotation du rouleau de transfert autour de son axe.This object is achieved by a non-impact magneto-graphical printing apparatus comprising a magnetic printing drum fed with toner from an ink tank on which information is recorded by at least one magnetic writing head to retain the toner in the written areas of the drum, a toner transfer roller on a substrate positioned between the magnetic drum and the transfer roller, arranged in parallel axes, characterized in that the printing apparatus comprises at least one printing device. cleaning the transfer roller, the cleaning device comprising a means for scraping the surface of the transfer roller, formed by a flexible blade, to take off from the roll and recover the majority of the toner particles which have not been fixed to the substrate, this scraper means bearing against the surface of the transfer roller downstream of the contact area of the transfer roller with the substrate relative to the direction of rotation of the transfer roller about its axis.

Selon une variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen de raclement de la surface du rouleau de transfert est formé par une lame associée à un moyen de réglage de l'angle d'inclinaison de la lame par rapport à la tangente du rouleau de transfert au point de contact de la lame avec la surface du rouleau de transfert.According to a variant of the invention, the magneto-graphical printing apparatus is characterized in that the means for scraping the surface of the transfer roller is formed by a blade associated with a means for adjusting the angle of rotation. tilting the blade relative to the tangent of the transfer roller at the point of contact of the blade with the surface of the transfer roller.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen de raclement de la surface du rouleau de transfert est formé par une lame courbée dont le bord en appui contre le rouleau de transfert est sensiblement tangent avec la surface du rouleau de transfert au niveau du point de contact de la lame avec le rouleau, et dont le bord opposé au bord de la lame en contact avec le rouleau de transfert, forme un angle non nul avec la perpendiculaire à la tangente à la surface du rouleau de transfert au niveau du point de contact de la lame avec le rouleau.According to another variant of the invention, the magneto-graphic printing apparatus is characterized in that the means for scraping the surface of the transfer roller is formed by a curved blade whose edge bears against the transfer roller. is substantially tangent with the surface of the transfer roller at the point of contact of the blade with the roller, and whose edge opposite the edge of the blade in contact with the transfer roller, forms a non-zero angle with the perpendicular to the tangent to the surface of the transfer roller at the point of contact of the blade with the roller.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le bord opposé au bord du moyen de raclement en contact avec le rouleau de transfert forme avec la perpendiculaire à la tangente à la surface du rouleau de transfert au niveau du point de contact du moyen de raclement avec le rouleau, un angle compris entre 5 et 60 degrés.According to another variant of the invention, the magneto-graphical printing apparatus is characterized in that the edge opposite the edge of the scraper means in contact with the transfer roller forms with the perpendicular to the tangent to the surface of the transfer roller at the level from the point of contact of the scraping means with the roller, an angle of between 5 and 60 degrees.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le dispositif de nettoyage comprend un moyen de récupération des particules de toner détachées par le moyen de raclement formé par un moyen d'aspiration.According to another variant of the invention, the magneto-graphical printing apparatus is characterized in that the cleaning device comprises a means for recovering the detached toner particles by the scraping means formed by a suction means.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen d'aspiration présente une buse d'aspiration dont l'orifice est positionné au niveau du bord du moyen de raclement en contact avec la surface du rouleau de transfert.According to another variant of the invention, the magneto-graphic printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned at the edge of the scraper means in contact with each other. with the surface of the transfer roller.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen d'aspiration présente une buse d'aspiration dont l'orifice est positionné en vis-à-vis du bord du moyen de raclement en contact avec la surface du rouleau de transfert, et selon un axe sensiblement parallèle à l'axe du bord longiligne du moyen de raclement en contact avec la surface du rouleau de transfert.According to another variant of the invention, the magneto-graphic printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned opposite the edge of the means. scraper in contact with the surface of the transfer roller, and along an axis substantially parallel to the axis of the elongate edge of the scraper means in contact with the surface of the transfer roller.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen d'aspiration présente une buse d'aspiration dont l'orifice est positionné à une distance du rouleau de transfert comprise entre 0,2 et 5 mm.According to another variant of the invention, the magneto-graphical printing apparatus is characterized in that the suction means has a suction nozzle whose orifice is positioned at a distance from the transfer roller between 0 , 2 and 5 mm.

Selon une autre variante de l'invention, l'appareil d'impression magnéto-graphiques est caractérisé en ce que le moyen d'aspiration fournit une dépression en entrée de buse d'aspiration comprise entre 0,07 et 6 kilo pascals.According to another variant of the invention, the magneto-graphical printing apparatus is characterized in that the suction means provides a vacuum at the suction nozzle inlet of between 0.07 and 6 kilo pascals.

L'invention, avec ses caractéristiques et avantages, ressortira plus clairement à la lecture de la description faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente une vue schématique d'une partie de l'appareil d'impression doté du dispositif de nettoyage de l'invention selon un plan perpendiculaire à l'axe du tambour et du rouleau de transfert,
  • la figure 2 représente vue détaillée d'une partie de l'appareil d'impression doté d'une variante du dispositif de nettoyage de l'invention, selon le même plan que pour la figure 1.
The invention, with its features and advantages, will emerge more clearly on reading the description given with reference to the appended drawings in which:
  • the figure 1 is a schematic view of a portion of the printing apparatus provided with the cleaning device of the invention in a plane perpendicular to the axis of the drum and the transfer roller,
  • the figure 2 represents a detailed view of a part of the printing apparatus with a variant of the cleaning device of the invention, in the same plane as for the figure 1 .

Le dispositif de la présente invention est destiné à tous les appareils d'impression magnéto-graphique non-impact qui peuvent être aussi bien des imprimantes que des photocopieurs.The device of the present invention is intended for all non-impact magneto-graphical printing apparatus which may be both printers and photocopiers.

L'appareil d'impression magnéto-graphique comprend au moins un tambour (2) d'impression magnétique formant un cylindre sur la surface duquel une ou plusieurs têtes d'écriture viennent enregistrer des informations destinées à être imprimées. Ce tambour (2) est disposé selon un axe parallèle à l'axe d'un rouleau (1) de transfert avec lequel il se trouve en contact. Lors de l'impression, les deux cylindres formés par le tambour (2) et le rouleau de transfert (1) réalisent des rotations axiales respectives dans des sens opposés en faisant rouler leur surface l'une contre l'autre. Le substrat (3) destiné à être le support de l'impression se trouve ainsi positionné entre les deux rouleaux (1 et 2) qui assurent, entre autre, son entrainement dans l'appareil.The magneto-graphic printing apparatus comprises at least one magnetic printing drum (2) forming a cylinder on the surface of which one or more write heads record information to be printed. This drum (2) is disposed along an axis parallel to the axis of a transfer roller (1) with which it is in contact. During printing, the two cylinders formed by the drum (2) and the transfer roller (1) rotate respective axially in opposite directions by rolling their surface against each other. The substrate (3) intended to be the medium of the printing is thus positioned between the two rollers (1 and 2) which ensure, among other things, its training in the apparatus.

Au cours de l'impression, une partie du toner déposé sur le tambour d'impression (2), chargé électro-statiquement, n'est pas utilisé pour imprimer le substrat (3). Lors du contact entre le tambour d'impression (2) et le rouleau de transfert (1), ce résidus de poudre d'encre, attiré par le champ électrostatique, vient alors s'accroché à la surface du rouleau de transfert (1) à partir duquel elle risque ensuite d'être diffusée sous la forme de poussière dans l'ensemble de l'appareil et d'y générer un encrassement. Pour éviter ce problème, un dispositif de nettoyage se trouve intégré à l'appareil.During printing, some of the toner deposited on the electrostatically charged print drum (2) is not used to print the substrate (3). Upon contact between the printing drum (2) and the transfer roller (1), this ink powder residue, attracted by the electrostatic field, then hangs on the surface of the transfer roller (1). from which it can then be spread in the form of dust throughout the device and generate fouling. To avoid this problem, a cleaning device is integrated into the device.

Ce dispositif de nettoyage comprend un moyen de raclement (4) positionné contre la surface du rouleau de transfert. Ce moyen de raclement (4) forme ainsi une lame dont le bord de raclement (4a) est en appui contre une zone du rouleau de transfert (1) située en aval de la zone de contact entre le tambour d'impression (2) et le rouleau de transfert ou de la zone du rouleau de transfert (1) où s'effectue l'impression, c'est-à-dire le transfert du toner sur le substrat (3), par rapport au sens de la rotation axiale du rouleau de transfert (1). Le bord de raclement (4a) de cette lame (4) se trouve ainsi en contact avec le rouleau de transfert (2) tandis que le bord (4b) de la lame (4) qui lui est opposé est fixé à un moyen de la structure de la machine.This cleaning device comprises a scraper means (4) positioned against the surface of the transfer roller. This scraping means (4) thus forms a blade whose scraping edge (4a) bears against an area of the transfer roller (1) located downstream from the contact zone between the printing drum (2) and the transfer roller or the area of the transfer roller (1) where the printing is carried out, that is to say the transfer of the toner on the substrate (3), with respect to the direction of the axial rotation of the transfer roller (1). The scraping edge (4a) of this blade (4) is thus in contact with the transfer roller (2) while the edge (4b) of the blade (4) which is opposite to it is fixed to a means of the structure of the machine.

Le moyen de raclement (4) est généralement métallique, préférentiellement en aluminium ou dans un alliage comprenant de l'aluminium, mais peut être réalisé en toute autre matière adaptée.The scraper means (4) is generally metallic, preferably aluminum or an alloy comprising aluminum, but may be made of any other suitable material.

Selon un mode de réalisation particulier, le bord (4b) de la lame (4) fixé à la machine est monté sur un moyen de réglage permettant de définir l'angle d'inclinaison de la lame par rapport à la perpendiculaire à la tangente au niveau du point de contact du bord de raclement (4a) de la lame (4) avec le rouleau de transfert (1). L'inclinaison de la lame demeure alors efficace lorsque l'angle est compris entre 5 et 60°.According to a particular embodiment, the edge (4b) of the blade (4) attached to the machine is mounted on an adjustment means for defining the angle of inclination of the blade relative to the perpendicular to the tangent to the level of the point of contact of the scraper edge (4a) of the blade (4) with the transfer roller (1). The inclination of the blade then remains effective when the angle is between 5 and 60 °.

Une variante du mode de réalisation consiste à utiliser une lame souple de sorte que lorsque le bord de raclement (4a) est pressé contre la surface du rouleau de transfert (1), la lame (4) se courbe. Cette courbure permet au niveau du bord de raclement (4a) de récupérer le toner resté sur le rouleau de transfert (1), et d'orienter ces particules d'encre détachées vers un moyen de récupération (5). Par ailleurs, une lame (4) souple à l'avantage d'être capable de s'affranchir des variations de la surface du rouleau de transfert (1) et de s'adapter aux éventuelles variations d'écart entre la surface du rouleau de transfert (1) en rotation et la structure fixe qui supporte la lame (4), tout en restant tangente à la surface du rouleau de transfert (1). De plus, il peut arriver que l'opérateur soit amené à changer le réglage du rouleau de transfert (1) en le déplaçant sur une distance de plusieurs dixièmes de millimètres par rapport au tambour (2) d'impression ou par rapport à la lame (4) du moyen de raclement. La souplesse de la lame (4) permet alors de compenser ces changements de côte.An alternative embodiment is to use a flexible blade so that when the scraper edge (4a) is pressed against the surface of the transfer roller (1), the blade (4) curves. This curvature allows the level of the scraper edge (4a) to recover the toner remaining on the transfer roller (1), and guide these detached ink particles to a recovery means (5). Moreover, a flexible blade (4) has the advantage of being able to overcome variations in the surface of the transfer roller (1) and to adapt to any variations in the gap between the surface of the roller transfer (1) in rotation and the fixed structure which supports the blade (4), while remaining tangent to the surface of the transfer roller (1). In addition, it may happen that the operator is required to change the setting of the transfer roller (1) by moving it a distance of several tenths of millimeters with respect to the printing drum (2) or with respect to the blade (4) scraper means. The flexibility of the blade (4) then makes it possible to compensate for these changes of coast.

Le moyen de récupération (5) des particules de toner détachées du rouleau de transfert (1) est formé par un dispositif d'aspiration qui présente une buse (5a) d'aspiration située à proximité du moyen de raclement (4) contre la surface du rouleau de transfert (1). Selon un mode de réalisation, cette buse (5a) d'aspiration se trouve positionnée au niveau du bord de raclement (4a) de la lame (4) de façon à récupérer les particules de toner dès leur détachement de la surface du rouleau de transfert (1). Le milieu de l'orifice de la buse (5a) d'aspiration est alors aligné avec l'axe du rouleau de transfert et le bord de raclement (4a) de la lame (4) contre la surface du rouleau de transfert (1). Selon une variante de réalisation, lorsque la lame (4) est courbée, la buse (5a) d'aspiration peut se trouver positionnée à proximité du bord fixé (4b) de la lame (4). La buse (5a) d'aspiration est alors orientée selon un axe parallèle à l'axe de la lame (4) au niveau de son bord fixe (4b). Un tel positionnement de la buse (5a) d'aspiration permet de créer un courant d'aspiration qui longe toute la surface courbée de la lame (4) depuis le bord de raclement (4a) vers le bord fixé (4b). Ce courant d'aspiration, en étant parallèle à l'axe de la lame (4) au niveau de son bord de raclement (4a), profite de la rotation du rouleau de transfert (1) qui vient propulser dans le sens de l'aspiration les particules de toner une fois détachées du rouleau (1).The recovery means (5) of the toner particles detached from the transfer roller (1) is formed by a suction device which has a suction nozzle (5a) located near the scraper means (4) against the surface of the transfer roller (1). According to one embodiment, this suction nozzle (5a) is positioned at the scraper edge (4a) of the blade (4) so as to recover the toner particles as soon as they are detached from the surface of the transfer roller. (1). The middle of the orifice of the suction nozzle (5a) is then aligned with the axis of the transfer roller and the scraper edge (4a) of the blade (4) against the surface of the transfer roller (1). . According to an alternative embodiment, when the blade (4) is curved, the suction nozzle (5a) can be positioned near the fixed edge (4b) of the blade (4). The suction nozzle (5a) is then oriented along an axis parallel to the axis of the blade (4) at its fixed edge (4b). Such positioning of the suction nozzle (5a) makes it possible to create a suction stream which runs along the entire curved surface of the blade (4) from the scraper edge (4a) to the fixed edge (4b). This suction stream, being parallel to the axis of the blade (4) at its scraper edge (4a), takes advantage of the rotation of the transfer roller (1) which propels in the direction of the sucking the toner particles off the roll (1).

Afin de fournir une aspiration optimale, la distance qui sépare la buse (5a) d'aspiration de la surface du rouleau de transfert (1) est comprise entre 0,2 et 7 mm. De même, la dépression qui est réalisée au niveau de l'orifice de la buse (5a) est comprise entre 0,05 et 6 hPa.In order to provide optimum suction, the distance between the suction nozzle (5a) and the surface of the transfer roller (1) is between 0.2 and 7 mm. Similarly, the depression that is achieved at the orifice of the nozzle (5a) is between 0.05 and 6 hPa.

II doit être évident pour les personnes versées dans l'art que la présente invention permet des modes de réalisation sous de nombreuses autres formes spécifiques sans l'éloigner du domaine d'application de l'invention comme revendiqué. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration mais peuvent être modifiés dans le domaine défini par la portée des revendications jointes ;It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration but may be modified in the field defined by the scope of the appended claims;

Claims (9)

Appareil d'impression magnéto-graphiques non-impact comprenant un tambour (2) d'impression magnétique alimenté en toner depuis un réservoir d'encre sur lequel des informations sont enregistrées par au moins une tête d'écriture magnétique pour retenir le toner dans les zones écrites du tambour (2), un rouleau de transfert (1) du toner sur un substrat (3) positionné entre le tambour (2) magnétique et le rouleau de transfert (1), disposés selon des axes parallèles, caractérisé en ce que l'appareil d'impression comprend au moins un dispositif de nettoyage du rouleau de transfert (1), le dispositif de nettoyage comprenant un moyen de raclement (4) de la surface du rouleau de transfert (1), formé par une lame souple, pour décoller du rouleau et récupérer la majorité des particules de toner qui ne se sont pas fixées au substrat (3), ce moyen de raclement (4) se trouvant en appui contre la surface du rouleau de transfert (1) en aval de la zone de contact du rouleau de transfert (1) avec le substrat (3) par rapport au sens de rotation du rouleau de transfert (1) autour de son axe.A non-impact magneto-graphical printing apparatus comprising a magnetic printing drum (2) fed with toner from an ink tank on which information is recorded by at least one magnetic writing head to retain the toner in the ink cartridges. written zones of the drum (2), a toner transfer roller (1) on a substrate (3) positioned between the magnetic drum (2) and the transfer roller (1), arranged in parallel axes, characterized in that the printing apparatus comprises at least one cleaning device of the transfer roller (1), the cleaning device comprising a scraping means (4) of the surface of the transfer roller (1), formed by a flexible blade, to take off from the roll and recover the majority of the toner particles that have not attached to the substrate (3), the scraping means (4) being in abutment against the surface of the transfer roller (1) downstream of the area contact of the tran roller sfert (1) with the substrate (3) relative to the direction of rotation of the transfer roller (1) about its axis. Appareil d'impression magnéto-graphiques selon la revendication 1, caractérisé en ce que le moyen de raclement (4) de la surface du rouleau de transfert (1) est formé par une lame associée à un moyen de réglage de l'angle d'inclinaison de la lame par rapport à la tangente du rouleau de transfert (1) au point de contact de la lame avec la surface du rouleau de transfert (1).Magneto-graphic printing apparatus according to claim 1, characterized in that the scraping means (4) of the surface of the transfer roller (1) is formed by a blade associated with an angle adjusting means. inclination of the blade relative to the tangent of the transfer roller (1) at the point of contact of the blade with the surface of the transfer roller (1). Appareil d'impression magnéto-graphiques selon une des revendications précédentes, caractérisé en ce que le moyen de raclement (4) de la surface du rouleau de transfert (1) est formé par une lame courbée dont le bord (4a) en appui contre le rouleau de transfert (1) est sensiblement tangent avec la surface du rouleau de transfert (1) au niveau du point de contact de la lame avec le rouleau (1), et dont le bord (4b) opposé au bord (4a) de la lame en contact avec le rouleau de transfert (1), forme un angle non nul avec la perpendiculaire à la tangente à la surface du rouleau de transfert (1) au niveau du point de contact de la lame avec le rouleau (1).Magneto-graphic printing apparatus according to one of the preceding claims, characterized in that the scraping means (4) of the surface of the transfer roller (1) is formed by a curved blade whose edge (4a) bears against the transfer roller (1) is substantially tangent with the surface of the transfer roller (1) at the point of contact of the blade with the roller (1), and whose edge (4b) opposite the edge (4a) of the blade in contact with the transfer roller (1) forms a non-zero angle with the perpendicular to the tangent to the surface of the transfer roller (1) at the point of contact of the blade with the roller (1). Appareil d'impression magnéto-graphiques selon une des revendications précédentes, caractérisé en ce que le bord opposé au bord du moyen de raclement (4) en contact avec le rouleau de transfert (1) forme avec la perpendiculaire à la tangente à la surface du rouleau de transfert au niveau du point de contact du moyen de raclement (4) avec le rouleau (1), un angle compris entre 5 et 60 degrés.Magneto-graphical printing apparatus according to one of the preceding claims, characterized in that the edge opposite the edge of the scraping means (4) in contact with the transfer roller (1) forms with the perpendicular to the tangent to the surface of the transfer roller at the point of contact of the scraping means (4) with the roller (1), an angle of between 5 and 60 degrees. Appareil d'impression magnéto-graphiques selon une des revendications précédentes, caractérisé en ce que le dispositif de nettoyage comprend un moyen de récupération (5) des particules de toner détachées par le moyen de raclement (4) formé par un moyen d'aspiration.Magneto-graphical printing apparatus according to one of the preceding claims, characterized in that the cleaning device comprises means for recovering (5) the detached toner particles by the scraping means (4) formed by suction means. Appareil d'impression magnéto-graphiques selon la revendication 5, caractérisé en ce que le moyen d'aspiration présente une buse (5a) d'aspiration dont l'orifice est positionné au niveau du bord (4a) du moyen de raclement (4) en contact avec la surface du rouleau de transfert (1).Magneto-graphic printing apparatus according to Claim 5, characterized in that the suction means has a suction nozzle (5a), the orifice of which is positioned at the edge (4a) of the scraper means (4). in contact with the surface of the transfer roller (1). Appareil d'impression magnéto-graphiques selon la revendication 5, caractérisé en ce que le moyen d'aspiration (5) présente une buse (5a) d'aspiration dont l'orifice est positionné en vis-à-vis du bord (4a) du moyen de raclement (4) en contact avec la surface du rouleau de transfert (1), et selon un axe sensiblement parallèle à l'axe du bord (4a) longiligne du moyen de raclement (4) en contact avec la surface du rouleau de transfert (1).Magneto-graphic printing apparatus according to claim 5, characterized in that the suction means (5) has a suction nozzle (5a) whose orifice is positioned opposite the edge (4a). scraper means (4) in contact with the surface of the transfer roller (1), and along an axis substantially parallel to the axis of the elongate edge (4a) of the scraper means (4) in contact with the surface of the roller transfer (1). Appareil d'impression magnéto-graphiques selon une des revendications 5 à 7, caractérisé en ce que le moyen d'aspiration (5) présente une buse (5a) d'aspiration dont l'orifice est positionné à une distance du rouleau de transfert (1) comprise entre 0,2 et 5 mm.Magneto-graphic printing apparatus according to one of claims 5 to 7, characterized in that the suction means (5) has a suction nozzle (5a), the orifice of which is positioned at a distance from the transfer roller ( 1) between 0.2 and 5 mm. Appareil d'impression magnéto-graphiques selon une des revendications 5 à 8, caractérisé en ce que le moyen d'aspiration (5) fournit une dépression en entrée de buse d'aspiration (5a) comprise entre 0,07 et 6 kilo pascals.Magneto-graphic printing apparatus according to one of claims 5 to 8, characterized in that the suction means (5) provides a vacuum at the suction nozzle inlet (5a) of 0.07 to 6 kilo pascals.
EP08290425A 2007-05-09 2008-05-06 Device for impact-free magnetographic printing ensuring reduced fouling of the device Withdrawn EP1990692A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0703310A FR2916057B1 (en) 2007-05-09 2007-05-09 NON-IMPACT MAGNETO-GRAPHIC PRINTING DEVICE FOR LIMIT DEVICE ENCRYPTION

Publications (1)

Publication Number Publication Date
EP1990692A1 true EP1990692A1 (en) 2008-11-12

Family

ID=38753526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08290425A Withdrawn EP1990692A1 (en) 2007-05-09 2008-05-06 Device for impact-free magnetographic printing ensuring reduced fouling of the device

Country Status (2)

Country Link
EP (1) EP1990692A1 (en)
FR (1) FR2916057B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646952A1 (en) * 1989-05-09 1990-11-16 Bull Sa Composite device for cleaning and lubricating the surface of a magnetic recording element
US5298953A (en) * 1993-04-27 1994-03-29 Xerox Corporation Biased transfer roll cleaner
JP2001265132A (en) * 2000-03-22 2001-09-28 Dainippon Printing Co Ltd Magnetic printer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646952A1 (en) * 1989-05-09 1990-11-16 Bull Sa Composite device for cleaning and lubricating the surface of a magnetic recording element
US5298953A (en) * 1993-04-27 1994-03-29 Xerox Corporation Biased transfer roll cleaner
JP2001265132A (en) * 2000-03-22 2001-09-28 Dainippon Printing Co Ltd Magnetic printer

Also Published As

Publication number Publication date
FR2916057A1 (en) 2008-11-14
FR2916057B1 (en) 2009-11-20

Similar Documents

Publication Publication Date Title
JPH0973255A (en) Liquid applying device and image forming material removing device provided with the liquid applying device
JP6891896B2 (en) Image removal device, reproduction method of recorded material and image removal method
JP5335387B2 (en) Conveying apparatus and recording apparatus
JP6014491B2 (en) Recording medium conveying member and image forming apparatus having the same
EP1990692A1 (en) Device for impact-free magnetographic printing ensuring reduced fouling of the device
JP7069940B2 (en) A method for manufacturing a medium transfer device, a printing device, and a medium transfer device.
JP6708811B2 (en) Liquid ejecting apparatus and image forming apparatus
JP3214992B2 (en) Apparatus for removing image forming substance from image carrier
JP2020054986A (en) Nonwoven fabric coating machine
JP3312982B2 (en) Apparatus for removing image forming substance from image carrier
JPH08336951A (en) Printed image post treatment apparatus
JPH08132593A (en) Print image postprocessor
JP3518840B2 (en) Image carrier playback device
JP5865831B2 (en) RECORDING MEDIUM CONVEYING DEVICE AND IMAGE FORMING DEVICE HAVING THE SAME
JP3269724B2 (en) Apparatus for removing image forming substance from image carrier
US6539865B2 (en) Method of preparing a lithographic printing plate for imaging in a printer engine
JP3994833B2 (en) Recording medium playback device
JP3506351B2 (en) How to use the image carrier repeatedly
JP3224644B2 (en) Apparatus for removing image-forming substance from image carrier, provided with peeling means having means for detecting the amount of image-forming substance adhering to the surface of the peeling member
JP3208409B2 (en) Apparatus for removing an image forming substance from an image carrier, provided with a peeling means having a means for removing an image forming substance from the surface of a peeling member
JP3468496B2 (en) Apparatus for removing image forming substance from image carrier
JP2004250219A (en) Inkjet printer
JPH0756472A (en) Method for removing image forming material from image holding body and device therefor
JP3299603B2 (en) Apparatus for removing image forming substance from image carrier and processing apparatus for image carrier
JPH09197926A (en) Device for removing image forming material from image holding body

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090507

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20121201