EP0182930A1 - Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication - Google Patents

Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication Download PDF

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Publication number
EP0182930A1
EP0182930A1 EP84114262A EP84114262A EP0182930A1 EP 0182930 A1 EP0182930 A1 EP 0182930A1 EP 84114262 A EP84114262 A EP 84114262A EP 84114262 A EP84114262 A EP 84114262A EP 0182930 A1 EP0182930 A1 EP 0182930A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
magnetic roller
magnet elements
roller according
magnetic
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
EP84114262A
Other languages
German (de)
English (en)
Other versions
EP0182930B1 (fr
Inventor
Horst Baermann
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.)
Baermann Max GmbH
Max Baermann GmbH
Original Assignee
Baermann Max GmbH
Max Baermann GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8192311&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0182930(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Baermann Max GmbH, Max Baermann GmbH filed Critical Baermann Max GmbH
Priority to DE8484114262T priority Critical patent/DE3472475D1/de
Priority to AT84114262T priority patent/ATE35466T1/de
Priority to EP84114262A priority patent/EP0182930B1/fr
Priority to US06/718,637 priority patent/US4638281A/en
Priority to CA000489995A priority patent/CA1240731A/fr
Priority to JP60263964A priority patent/JPS61148474A/ja
Publication of EP0182930A1 publication Critical patent/EP0182930A1/fr
Application granted granted Critical
Publication of EP0182930B1 publication Critical patent/EP0182930B1/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
    • G03G15/06—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core

Definitions

  • the invention relates to magnetic rollers for copying machines and a method for producing the same.
  • Such magnetic rollers are used for electrophotographic copiers.
  • the magnetic roller is concentrically surrounded by a toner tube, usually made of diamagnetic material, at a short distance.
  • the toner tube serves to supply a magnetically attractable toner powder from a powder container onto a carrier material on which the electrostatic image is generated. It is particularly important here that the toner tube has a uniform powder layer in the region of the development zone. However, this can only be achieved if the required induction is exactly present over the respective pole in the working area of the magnetic roller.
  • the magnetic rollers consist of a carrier body on which strip-shaped, plastic-bonded permanent magnets extending in the axial direction are provided.
  • DE-AS 12 18 287, DE-OS 33 14 885, DE-OS 34 02 864 Due to the manufacturing process and the magnetization of the plastic-bonded, preferably extruded, permanent magnet body in the form of a strip and its mounting on the carrier body of the magnetic roller, both mechanical tolerance fluctuations and magnetic fluctuations can be seen, which result in an uneven course of the induction over the circumference and the length of the magnetic roller or make the toner tube noticeable, do not avoid. These fluctuations are particularly disadvantageous because they lead to banding on the copies made.
  • the invention succeeds in creating magnetic rollers which always have the same required induction values over the predetermined radius and / or arc or angular dimension, even if the individual permanent magnet elements have deviations in their magnetic and mechanical values.
  • the invention succeeds in creating magnetic rollers which are suitable both for copying machines which require a homogeneous field distribution, ie an induction of equal magnitude, between adjacent poles on the circumference or the predetermined radius of the magnetic roller, and for copying machines, the magnetic rollers require, where the 'induction between a oder.limehreren neighboring Tru vary.
  • the particular advantage is therefore that the magnetic roller according to the invention can be used universally for most types of copying machines.
  • Another advantage is the fact that the extensive inventory of permanent magnets with different pole thicknesses that was previously required is no longer required.
  • the method proposed according to the invention enables the permanent magnet elements to be precisely adjusted to the required induction value using simple means and in a simple manner. Another advantage is that the magnetic roller manufactured according to the invention has a low weight.
  • FIG. 1 shows a magnetic roller 1 according to the invention, which consists of a non-magnetic carrier material 2, such as aluminum.
  • the magnetic roller is surrounded concentrically with an air gap 3 in between by a toner tube 4 made of diamagnetic material, such as aluminum or non-magnetic steel.
  • the magnetic roller moves relative to the toner tube around a shaft, not shown, for example with a ball bearing on one or both sides.
  • the carrier material 2 of the magnetic roller 1 is provided on its circumference with recesses 5 running in the axial direction. Strip-shaped permanent magnet elements 6 are adjustably arranged in these recesses. For this purpose, the cross section of the recesses is made larger than the cross section of the permanent magnet elements.
  • induction measuring probes for the purpose of adjusting the permanent magnet elements to the required induction value for a given radius r and / or radian b between adjacent permanent magnet elements, induction measuring probes, in the present case Hall probes 7, are arranged in the region of the permanent magnet elements.
  • the given radius is to be understood as the radius from the center Z of the magnetic roller to a certain distance above the magnetic roller, which in most cases corresponds to the outer circumference of the toner tube.
  • the toner tube is usually not yet installed with the magnetic roller. It is sufficient if the Hall probes are arranged and held at the predetermined distance r over the circumference of the magnetic roller.
  • the permanent magnet elements 6 are adjusted by radial and / or tangential displacement and / or rotation in the recesses of the carrier material until the Hall probes indicate the required value of the induction. In this adjusted state, the permanent magnet elements are fixed in the recesses by an injection-molded plastic 8.
  • the permanent magnet elements can also be fixed by gluing and / or pouring out with a casting resin or by foaming with a plastic foam. You can also fix the permanent magnet elements by clamping elements 16 before spraying or foaming.
  • the carrier material 2 consists of a hub body 9, from which a number of ribs 10 extend outwards in the radial direction.
  • the recesses 5 formed between the ribs accommodate the permanent magnet elements 6, which have a segment-shaped cross section.
  • the cutouts are larger in cross section than the cross section of the permanent magnet elements, so that the permanent magnet elements can be adjusted within the cutouts.
  • Hall probes 7 are in turn provided above the toner tube 4, which indicate the required induction during the adjustment. As soon as the adjustment, as explained in FIG. 1, has taken place, the permanent magnet elements are in turn fixed with an injectable plastic 8, extruded or extrusion-coated.
  • the adjusted permanent magnet elements 6 lie within the recesses 5 such that the injected plastic is present on the right of the permanent magnet element or on the left of the permanent magnet element. There is also the possibility that one or more permanent magnet elements are completely encased in plastic.
  • the carrier material 2 consists of two disk-shaped end bodies 11.
  • the end bodies are in turn with recesses. 5 provided, in which the permanent magnet elements 6 are adjustably fitted and adjusted with the aid of Hall probes, not shown, in the manner described above to the required induction at the specified radius.
  • the permanent magnet elements are then fixed with a sprayable plastic 8 or adhesive.
  • a cylindrical hollow rung body 12 is formed, in which the permanent magnet elements represent the so-called rungs.
  • the cylindrical hollow sprout body is sodanna: filled with a sprayable plastic foam 15.
  • the hollow rung body 12 is brought into an appropriately designed injection mold 13.
  • the injection mold is shown schematically in Fig.3.
  • the end bodies 11 can be cut off at the points shown in dashed lines in the drawing in order to obtain a particularly light and stable magnetic roller against deformation.
  • the roller part remaining after cutting must have the required length of the magnetic roller.
  • the end body 11 can also be omitted if the multi-part injection mold 13 is provided with laterally removable cover plates, into which corresponding recesses for receiving and adjusting the permanent magnet elements are incorporated.
  • the magnetic roller produced according to FIG. 3 is shown in FIG. 4 in a vertical half-section.
  • the carrier material 2 consists entirely of plastic foam 15, in which the permanent magnet elements 6 are held in the aligned position.
  • the aligned position can be seen in this figure, e.g. the permanent magnet element 6a is slightly rotated in the axial direction.
  • a bearing bush 14 is also injected.
  • the temperature of the injectable plastic 8 or plastic foam 15 must be in such a temperature range during its processing that when plastic-bonded permanent magnet elements are used they do not suffer any deformation during extrusion or extrusion coating, but the sprayed-out plastic does not, however, in the cooled state due to the heating of the copying machine is deformable.
  • Polyurethane is particularly suitable as a foamable plastic and its derivatives. However, it is also possible to use a phenolic resin.
  • the permanent magnet elements can consist of sintered, highly coercive permanent magnet material such as barium or strontium ferrite, cobalt-rare earth alloys or neodymium iron.
  • the permanent magnet elements 6 consist of a mixture of a thermoplastic binder and a powdery, highly coercive permanent magnet material such as barium ferrite or strontium ferrite. It is also a mixture of the two Ma g NETMA t he i al i s possible.
  • the permanent magnet elements are molded by extrusion or injection molding. You can either produce permanent magnetic strips directly or plates from which the individual strips are then cut. Permanent magnet elements can also be pressed from this mixture, especially if a thermosetting plastic, such as phenolic resin, is used.
  • the cross section of the permanent magnet elements can have any shape.
  • the permanent magnet elements preferably have a rectangular, square or segment-shaped cross section. But they can also have a ring section or circular cross section.
  • the magnetization of the permanent magnet elements may vary depending on the ver 7 arrived copying roller type in radial and / or tangential and / or arcuate direction are made.
  • the magnetization in the radial direction is shown, for example, in the right permanent magnet element 6 in FIG. 1.
  • the north pole, identified by an N is located on the surface facing the toner tube 4 and the opposite pole, identified by an S, on the surface of the permanent magnet element facing away from the toner tube.
  • the tangential magnetization of the permanent magnet elements is shown for example in Fig.4. There is this magnetization by the poles N and S in the right permanent magnet element 6 featured.
  • the arcuate magnetization is also shown in FIG. 2 for a permanent magnet element 6 by the letters N and S shown.
  • the permanent magnet elements are preferably arranged in the carrier material such that the poles, which are directed towards the toner tube, have opposite polarity to the pole of the adjacent permanent magnet element.
  • the permanent magnet elements 6 can be connected on the side facing away from the roller surface to a strip-shaped carrier body 17, preferably by gluing, in order to give the permanent magnet element greater stability, in particular to avoid deformations caused by heat.
  • the permanent magnet elements can have a smaller thickness and, in a sense, can even be flexible.
  • This embodiment with the stiffening carrier body is also particularly suitable for the embodiment of the magnetic roller shown in FIGS. 3 and 4 as a hollow hollow body.
  • the carrier body can be made of a magnetically non-conductive material, such as e.g. Aluminum.
  • the strip-shaped carrier body can also be made of a magnetically highly conductive material, such as e.g. Soft iron, exist.
  • the induction on the surface of the permanent magnet element directed towards the toner tube increases. It is known that the induction of permanent magnets increases when they are provided with an iron yoke; in the present case, however, this known effect can advantageously be used.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
EP84114262A 1984-11-26 1984-11-26 Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication Expired EP0182930B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8484114262T DE3472475D1 (en) 1984-11-26 1984-11-26 Magnetic rolls for copier machines and method of making the same
AT84114262T ATE35466T1 (de) 1984-11-26 1984-11-26 Magnetwalze fuer kopiergeraete und verfahren zur herstellung derselben.
EP84114262A EP0182930B1 (fr) 1984-11-26 1984-11-26 Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication
US06/718,637 US4638281A (en) 1984-11-26 1985-04-01 Magnetic roll for copy machines and method for manufacturing same
CA000489995A CA1240731A (fr) 1984-11-26 1985-09-04 Rouleau magnetique pour machines duplicatrices et methode de fabrication
JP60263964A JPS61148474A (ja) 1984-11-26 1985-11-26 複写機用の磁気ロ−ラ及びその製法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84114262A EP0182930B1 (fr) 1984-11-26 1984-11-26 Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication

Publications (2)

Publication Number Publication Date
EP0182930A1 true EP0182930A1 (fr) 1986-06-04
EP0182930B1 EP0182930B1 (fr) 1988-06-29

Family

ID=8192311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114262A Expired EP0182930B1 (fr) 1984-11-26 1984-11-26 Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication

Country Status (6)

Country Link
US (1) US4638281A (fr)
EP (1) EP0182930B1 (fr)
JP (1) JPS61148474A (fr)
AT (1) ATE35466T1 (fr)
CA (1) CA1240731A (fr)
DE (1) DE3472475D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311020A3 (fr) * 1987-10-05 1990-11-28 Fujitsu Limited Positionnement angulaire des aimants dans un rouleau de développement utilisé dans des appareils électrophotographiques ou analogues
EP0773484A1 (fr) * 1995-11-07 1997-05-14 Océ-Nederland B.V. Système magnétique pour un appareil de formation d'images
CN111111908A (zh) * 2019-12-02 2020-05-08 宁波西磁磁业发展股份有限公司 一种磁板补偿式皮带除铁机

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954800A (en) * 1986-05-20 1990-09-04 Canon Kabushiki Kaisha Magnet and method of manufacturing the same
US4823102A (en) * 1987-10-05 1989-04-18 Xerox Corporation Magnetic roll for a copier
JPH0195277U (fr) * 1987-12-17 1989-06-23
US5030937A (en) * 1989-08-02 1991-07-09 Xolox Corporation Magnet roll
US5019796A (en) * 1989-12-22 1991-05-28 Eastman Kodak Company Bar magnet for construction of a magnetic roller core
US5581422A (en) * 1993-02-09 1996-12-03 Hitachi Metals, Ltd. Actuator with moveable coil and recording apparatus
DE4311398C2 (de) * 1993-04-07 2000-12-28 Kobold Klaus Flügelrad für Durchflußmesser
FR2710113B1 (fr) * 1993-09-16 1995-12-22 Aerospatiale Barreau magnétique courbe ou rectiligne, formé d'aimants disjoints.
US5558091A (en) * 1993-10-06 1996-09-24 Biosense, Inc. Magnetic determination of position and orientation
DE19543316A1 (de) * 1995-11-21 1997-05-22 Bielomatik Leuze & Co Bearbeitungs-Werkzeug zur Bearbeitung von Lagen-Material o. dgl.
US6061541A (en) * 1996-09-04 2000-05-09 Clarity Imaging Technologies, Inc. Supplemental magnet strip for toner cartridge developer roll magnet and method for employing the same
US6125255A (en) 1996-09-23 2000-09-26 Xerox Corporation Magnet assembly with inserts and method of manufacturing
US6452380B1 (en) 2000-03-23 2002-09-17 Lexmark International, Inc. Rod and apparatus for calibrating magnetic roll testing apparatus
JP2002287502A (ja) * 2001-03-23 2002-10-03 Ricoh Co Ltd 現像ローラ
US6862415B2 (en) 2001-06-27 2005-03-01 Eastman Kodak Company Device for treating the surface of an article in connection with printing
US6897752B2 (en) * 2001-07-25 2005-05-24 Lexmark International, Inc. Magnetic roller and methods of producing the same
US6850140B1 (en) 2003-09-10 2005-02-01 Magnetic Technologies Corporation Layered magnets and methods for producing same
US7373716B2 (en) * 2003-10-22 2008-05-20 Dexter Magnetic Technologies, Inc. Method for constructing permanent magnet assemblies
CN100563839C (zh) * 2003-11-07 2009-12-02 Sgm台架股份公司 具有铁氧体和稀土永磁体的磁分离器
US7135792B2 (en) * 2004-05-12 2006-11-14 Dexter Magnetic Technologies, Inc. High field voice coil motor
JP2008233368A (ja) * 2007-03-19 2008-10-02 Ricoh Co Ltd マグネットローラ、現像剤担持体、現像装置、プロセスカートリッジ及び画像形成装置
US20100123779A1 (en) * 2008-11-18 2010-05-20 Dennis Michael Snyder Video recording system for a vehicle
DE102017104895B4 (de) * 2017-03-08 2021-08-19 Preh Gmbh Formgebendes Verfahren zur Herstellung eines einen Permanentmagneten aufweisenden Verbundteils
CN107235335B (zh) * 2017-06-29 2019-04-05 江西电力职业技术学院 电磁铁质零件捡拾装置以及零件捡拾车

Citations (7)

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Publication number Priority date Publication date Assignee Title
DE1079237B (de) * 1956-09-22 1960-04-07 Marius Cominoli Magnetische Befestigungsvorrichtung fuer einen an ferromagnetischen Metallflaechen magnetisch haftend festzulegenden Gebrauchsgegenstand
FR1475501A (fr) * 1966-04-13 1967-03-31 Deutsche Edelstahlwerke Ag Pôles d'aimants permanents pour systèmes d'aimants permanents
FR2017526A1 (fr) * 1968-09-06 1970-05-22 Siemens Ag
FR2457031A1 (fr) * 1979-05-15 1980-12-12 Lucas Industries Ltd Procede d'assemblage d'un rotor a aimants permanents
EP0063377A1 (fr) * 1981-04-20 1982-10-27 Yamauchi Rubber Industry Co., Ltd. Rouleaux magnétiques et un procédé pour sa fabrication
DE3402864A1 (de) * 1983-01-29 1984-08-02 Ricoh Co., Ltd., Tokio/Tokyo Magnetrolle und verfahren zum herstellen einer magnetrolle
DE3314885A1 (de) * 1983-04-25 1984-10-25 Max Baermann GmbH, 5060 Bergisch Gladbach Magnetwalze fuer kopiergeraet

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DE1176440B (de) * 1962-04-26 1964-08-20 Max Baermann Riementrieb mit magnetischer Verstaerkung des Kraftschlusses
DE1218287B (de) * 1962-12-21 1966-06-02 Zindler Lumoprint Kg Vorrichtung zum Entwickeln elektrostatischer Bilder
US3641969A (en) * 1969-12-18 1972-02-15 Plastic Coating Corp Toner unit for photoelectrostatic reproduction
US3663850A (en) * 1970-08-03 1972-05-16 Phelon Co Inc Field means for a dynamoelectric machine, magnet preassembly for use therein
US4558294A (en) * 1983-03-31 1985-12-10 Hitachi Metals, Ltd. Magnet roll and method of producing the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1079237B (de) * 1956-09-22 1960-04-07 Marius Cominoli Magnetische Befestigungsvorrichtung fuer einen an ferromagnetischen Metallflaechen magnetisch haftend festzulegenden Gebrauchsgegenstand
FR1475501A (fr) * 1966-04-13 1967-03-31 Deutsche Edelstahlwerke Ag Pôles d'aimants permanents pour systèmes d'aimants permanents
FR2017526A1 (fr) * 1968-09-06 1970-05-22 Siemens Ag
FR2457031A1 (fr) * 1979-05-15 1980-12-12 Lucas Industries Ltd Procede d'assemblage d'un rotor a aimants permanents
EP0063377A1 (fr) * 1981-04-20 1982-10-27 Yamauchi Rubber Industry Co., Ltd. Rouleaux magnétiques et un procédé pour sa fabrication
DE3402864A1 (de) * 1983-01-29 1984-08-02 Ricoh Co., Ltd., Tokio/Tokyo Magnetrolle und verfahren zum herstellen einer magnetrolle
DE3314885A1 (de) * 1983-04-25 1984-10-25 Max Baermann GmbH, 5060 Bergisch Gladbach Magnetwalze fuer kopiergeraet

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* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Band 20, Nr. 4, September 1977, Seiten 1526-1527, New York, US; G.P. DOUBLE: "Manual field adjustment for NMR magnet" *
IBM TECHNICAL DISCLOSURE BULLETIN, Band 23, Nr. 7B, Dezember 1980, Seiten 3158-3159, New York, US; R.L. HERMAN: "Crimped magnetic roll" *
IBM TECHNICAL DISCLOSURE BULLETIN, Band 25, Nr. 11A, April 1983, Seiten 5649-5650, New York, US; G.D. MILLER: "Computer-controlled copier magnetic brush tester" *
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 18 (P-100)[896], 2. Februar 1982; & JP - A - 56 140 380 (HITACHI KINZOKU K.K.) 02.11.1981 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311020A3 (fr) * 1987-10-05 1990-11-28 Fujitsu Limited Positionnement angulaire des aimants dans un rouleau de développement utilisé dans des appareils électrophotographiques ou analogues
EP0773484A1 (fr) * 1995-11-07 1997-05-14 Océ-Nederland B.V. Système magnétique pour un appareil de formation d'images
US5812921A (en) * 1995-11-07 1998-09-22 Oce-Nederland, B.V. Magnet system for an image-forming apparatus
CN111111908A (zh) * 2019-12-02 2020-05-08 宁波西磁磁业发展股份有限公司 一种磁板补偿式皮带除铁机

Also Published As

Publication number Publication date
CA1240731A (fr) 1988-08-16
DE3472475D1 (en) 1988-08-04
JPS61148474A (ja) 1986-07-07
US4638281A (en) 1987-01-20
EP0182930B1 (fr) 1988-06-29
ATE35466T1 (de) 1988-07-15

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