EP0394228A1 - Station de developpement pour une machine electrophotographique a imprimer ou a copier avec un dispositif empechant l'entrainement du melange. - Google Patents

Station de developpement pour une machine electrophotographique a imprimer ou a copier avec un dispositif empechant l'entrainement du melange.

Info

Publication number
EP0394228A1
EP0394228A1 EP88901802A EP88901802A EP0394228A1 EP 0394228 A1 EP0394228 A1 EP 0394228A1 EP 88901802 A EP88901802 A EP 88901802A EP 88901802 A EP88901802 A EP 88901802A EP 0394228 A1 EP0394228 A1 EP 0394228A1
Authority
EP
European Patent Office
Prior art keywords
developer
area
magnetic
gap
carpet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88901802A
Other languages
German (de)
English (en)
Other versions
EP0394228B1 (fr
Inventor
Josef Knott
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.)
Canon Production Printing Germany GmbH and Co KG
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 EP0394228A1 publication Critical patent/EP0394228A1/fr
Application granted granted Critical
Publication of EP0394228B1 publication Critical patent/EP0394228B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0896—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894
    • G03G15/0898—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894 for preventing toner scattering during operation, e.g. seals
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration

Definitions

  • Developer station for an electrophotographic printing or copying station with a device for preventing the mixture discharge.
  • the invention relates to a developer station for an electrophotographic printing or copying station according to claim 1.
  • charge images are stored on a charge image carrier, e.g. produced on a photoconductor drum or on a photoconductor tape or directly on special paper and then colored with a black powder (toner) in a developer station.
  • a black powder toner
  • the toner image is then transferred to normal paper and fixed on it.
  • a two-component developer is used for the development, which consists of ferromagnetic carrier particles and toner particles.
  • This developer mixture hereinafter referred to briefly as "toner" is transported from a storage container of the developer station with the aid of a so-called magnetic brush arrangement to the charge image on the charge image carrier and is guided past the charge image carrier.
  • the toner particles are then transferred to the charge image carrier by electrostatic forces and adhere there depending on the character.
  • Such a magnetic brush arrangement is known for example from DE-PS 31 17 238. It consists of a rotating hollow cylinder and a magnet arrangement arranged in the interior of the hollow cylinder.
  • the individual magnets of the magnet arrangement are attached to a carrier. They have alternating polarity in the direction of movement of the hollow cylinder and thus cause the developer mixture to be transported on the hollow cylinder from the storage container to the charge image carrier.
  • the individual magnets have the shape of a bar. They are magnetized homogeneously over their length and generate a homogeneous magnetic field over their length, which emerges vertically from the hollow cylinder. In the edge areas of the magnetic strip in the vicinity of the side edges of the magnetic strips, this field becomes inhomogeneous due to the edge and takes on the character of a stray field.
  • a mixture discharge can occur at the edge regions of the developer roller.
  • This so-called mixture discharge consists of a transfer of developer mixture beyond the surface of the developer roller. That the mixture of carpets on the surface of the developer roller widens in a disruptive manner.
  • the mixture discharge is particularly disruptive in the area of the developer gap. Discharge of mixture in this area must be avoided in any case, because this has an immediate effect on the inking and thus the print quality of the photoconductor drum.
  • the object of the invention is to design a developer station of the type mentioned in such a way that a developer discharge does not occur in the area of the developer gap. This object is achieved in a developer station of the type mentioned in accordance with the features of the first claim.
  • the mixed carpet is guided in the conveying area in such a way that it has a width in the developer gap in relation to the magnetic strips effective there that extends across the width of the homogeneous magnetic field area of the magnetic strips, exclusively the inhomogeneous magnetic field area.
  • This targeted guidance is achieved by coordinating the length of the magnetic strips with one another or by mechanical guide or limiting elements or by a combination of magnetic and mechanical elements.
  • these mechanical guide or delimiting elements can consist of side elements of the developer station housing, which, starting from the developer mixture supply area, are briefly referred to as "toner supply area", extend to the developer gap over the circumference of the developer roller and a guide channel for the mixed carpet form, which spreads from the toner supply area to the developer nip.
  • the magnetic strips are shortened in the conveying area in such a way that the mixed carpet is narrowed in width between the toner supply area and the developer gap.
  • magnetic strip is used for agitated areas in the developer roller.
  • This Agnetized areas can be continuous strips, but they can also consist of magnetized partial surfaces of a magnetic hollow roller or be composed of individual rod magnets. What is important here is their homogeneous magnetic field along the axial extent of the magnetic strips and their field line course perpendicular to the hollow roller of the developer station.
  • the term “magnetic strip” is used for all of these cases.
  • FIG. 1 shows a schematic sectional view of the developer area of an electrophotographic printing device
  • FIG. 2 shows a schematic longitudinal section of the development area of FIG. 1 along the section line AB and
  • FIG. 3 shows a schematic sectional illustration of two embodiments of the embodiment with the illustration corresponding to the section line AC of FIG. 1.
  • a charge image is generated in a known manner on a photoconductor drum 10 using a character generator.
  • This charge pattern is colored in a developer nip 11 with the aid of the developer station shown in FIG. 1.
  • the developer station consists of an actual dimensionally stable station housing 12 with a developer roller 13 rotatably mounted therein, which is driven by a motor 14. Instead of the motor 14, it is also possible to connect the developer roller 13 to a central printer drive via a gear.
  • the developer roller 13 contains a hollow roller made of aluminum 15, it is supported on one side via bearings 16 on a housing part. With its other end it is over a bearing 17 guided on a support plate 18.
  • the support disk 18 is fastened in the station housing in a radially adjustable manner by means of an adjusting device 19; it carries a magnetized hollow roller 21 with a plurality of magnetic strips N1, S1, N2, S2 arranged thereon via holding elements 20.
  • these magnetic strips represent magnetized regions of the hollow roller 21.
  • the magnetic strips can be adjusted in the radial position relative to the hollow roller 15 of the developer roller via the magnetic hollow roller. This allows e.g. change the position of the magnetic strip N2 effective in the area of the developer gap and thus influence the mixture application in the developer gap 11.
  • the magnetic strips N1, S1, N2, S2 consist of homogeneously magnetized areas which have a homogeneous magnetization over the entire length L.
  • the emerging magnetic field lines have an inhomogeneous distribution at the edges R.
  • the magnetic strips N, S are arranged on the magnetic roller 21 parallel to the hollow roller 15. If, as in the exemplary embodiment shown, four magnetic strips are used, the first magnetic strip N1 (magnetic north pole) is assigned to the toner supply area (metering area) D and the following magnetic strip S (magnetic south pole) is assigned to the conveying area F.
  • the developer zone E is followed by an outlet area AU with a magnetic strip S2 (magnetic south pole).
  • the magnetic strips N, S generate a magnetic field standing vertically on the hollow roller 15 made of aluminum, which results in a brush-like configuration of the developer mix carpet 23 made of ferro-magnetic carrier particles with toner particles attached to them.
  • the developer mixture is fed in the direction of the arrow shown in FIG. 1 to a metering area D (toner supply area) of the developer station.
  • the metering area contains a metering gap 24 which is laterally delimited by two delimiting blocks 25 made of plastic.
  • the metering gap width SM between the developer roller (hollow roller 15) and the station housing depends on the required metering quantity of the toner and thus on the printing output.
  • the gap length SL in turn depends on the width of the developer gap.
  • the developer gap itself has a length which is somewhat shorter than the length L of the magnetic strips. As a result, a mixed carpet of developer mixture is produced in the area of the developer gap 11, which has approximately the width of the magnetic bar length L.
  • the metering gap is laterally limited by limiting blocks 25.
  • the metering gap length SL thus becomes shorter than the length L of the magnetic strips.
  • the developer mixture When the developer mixture is transported from the feed area for the developer mixture, referred to as the toner feed area D, via the conveying area F to the developer area E.
  • the developer mixture carpet widens gradually until it has a width in the developer nip on the hollow roller 15 which corresponds approximately to the length of the magnetic strip N2.
  • the mixture carpet is thus in the homogeneous area of the magnetic strip N2 and a lateral mixture discharge at the edges R cannot occur.
  • the unused mixture carpet is returned to the developer station with the aid of the hollow roller 15 moved in the direction of the arrow.
  • a scraping element 27 is arranged, which lifts the mixture carpet from the developer roller 13 and feeds it again to the toner supply area via mixing stages (not shown here).
  • delimiting elements 28 are arranged instead of the delimiting blocks 25. These delimiting elements 28 are made of plastic and can also be formed as part of the side walls of the station housing 12. The delimiting elements 28 are arranged on both sides of the developer roller and, with their edges 29, form a guide channel for the mixture carpet which extends from the toner supply area to the developer gap over the circumference of the developer roller and which gradually follows the edge profile of FIG. 3 ⁇ Lich expanded from the metering gap 24 to the developer area E.
  • this expansion can be carried out continuously, but it can also be stepwise, so that the mixed carpet increases step by step.
  • the mixture can also be discharged by directing the mixture carpet by adjusting the length of the magnetic strips prevent. This can be achieved through various measures.
  • the transport magnetic strip S1 effective in the conveying region F is shorter on both sides by 1 to 5 mm than the magnetic strips arranged before and after it in 1 or in 2.
  • the shortening V of the transport magnetic strip S1 narrows the mixed carpet during transport in this area F, ie a constriction of the mixed carpet. Since the magnetic field at the coloring magnet N2 (developer gap 11) extends further outward than the homogeneous magnetic field region of the transport magnetic strip S1, the edges of the mixed carpet in the region of the developer gap 11 are in the homogeneous magnetic field region and a mixture discharge beyond the edges does not occur.
  • the holding magnet N1 is reduced in length in the area of the metering device by 1 to 10 mm, preferably by 2 to 5 mm, compared to the following magnetic strips S1.
  • the mixed carpet is taken over from the metering area D into the conveying area F, it is thus ensured that the edges of the mixed carpet lie in the area of the homogeneous fields of the magnetic strips of the conveying area F and thus also of the development area E. This measure also prevents mixture discharge.
  • the same effect as is achieved by shortening the magnets N1 or S1 can be achieved by lengthening the coloring magnet N2, i.e. of the magnet acting in the developer gap on both sides by a defined dimension of 1 to 10 mm or 2 to 5 mm, based on the length of the magnetic strip S1 lying in the conveying area F.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

Pour éviter l'entraînement du mélange dans la zone de développement d'une installation d'impression électrophotographique, le tapis de mélange est guidé jusqu'à la fente du développement de telle manière que ce tapis (23) présente dans la fente (11, E), par rappport aux barreaux aimantés (N2) agissant dans cette zone, une largeur recouvrant la largeur du champ magnétique homogène des barreaux aimantés, à l'exclusion du champ magnétique non homogène (R). Le guidage recherché pour le tapis de mélange (23) est obtenu en adaptant mutuellement les longueurs des barreaux aimantés (N, S) et/ou par des éléments mécaniques de guidage ou de limitation (25, 28).
EP88901802A 1988-03-04 1988-03-04 Station de developpement pour une machine electrophotographique a imprimer ou a copier avec un dispositif empechant l'entrainement du melange Expired - Lifetime EP0394228B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/DE1988/000116 WO1989008285A1 (fr) 1988-03-04 1988-03-04 Station de developpement pour une machine electrophotographique a imprimer ou a copier avec un dispositif empechant l'entrainement du melange
US07/954,938 US5307125A (en) 1988-03-04 1992-09-30 Development station for an electrophotographic printing or copying station having a means for preventing the discharge of the mixture

Publications (2)

Publication Number Publication Date
EP0394228A1 true EP0394228A1 (fr) 1990-10-31
EP0394228B1 EP0394228B1 (fr) 1991-07-17

Family

ID=25952572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901802A Expired - Lifetime EP0394228B1 (fr) 1988-03-04 1988-03-04 Station de developpement pour une machine electrophotographique a imprimer ou a copier avec un dispositif empechant l'entrainement du melange

Country Status (4)

Country Link
US (1) US5307125A (fr)
EP (1) EP0394228B1 (fr)
JP (1) JPH03503319A (fr)
WO (1) WO1989008285A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006031876A1 (de) 2006-07-10 2008-01-17 OCé PRINTING SYSTEMS GMBH Entwicklerstation mit Glättvorrichtung und Verfahren zum Betreiben einer Entwicklerstation
JP6049296B2 (ja) * 2012-04-27 2016-12-21 キヤノン株式会社 現像装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE792643A (fr) * 1971-12-17 1973-03-30 Ibm Dispositif de developpement electrophotographique
FR2227567B1 (fr) * 1973-04-26 1978-04-21 Xerox Corp
US3982498A (en) * 1973-11-19 1976-09-28 Xerox Corporation Development apparatus
JPS554837Y2 (fr) * 1974-02-20 1980-02-05
NL7509870A (nl) * 1975-08-20 1977-02-22 Oce Van Der Grinten Nv Magneetrol.
JPS5565977A (en) * 1978-11-10 1980-05-17 Canon Inc Magnetic powder conveyor
JPS55113074A (en) * 1979-02-24 1980-09-01 Konishiroku Photo Ind Co Ltd Developing device for electrophotographic copier
JPS55151673A (en) * 1979-05-17 1980-11-26 Canon Inc Developing device
US4300475A (en) * 1980-06-18 1981-11-17 Litton Systems, Inc. Toning system
DE3117238C2 (de) * 1981-04-30 1984-11-15 Siemens AG, 1000 Berlin und 8000 München Magnetbürstenanordnung in einer Entwicklungsvorrichtung zur Entwicklung von Ladungsbildern auf einem Ladungsbildträger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8908285A1 *

Also Published As

Publication number Publication date
JPH03503319A (ja) 1991-07-25
EP0394228B1 (fr) 1991-07-17
US5307125A (en) 1994-04-26
WO1989008285A1 (fr) 1989-09-08

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