EP0182930B1 - Magnetic rolls for copier machines and method of making the same - Google Patents

Magnetic rolls for copier machines and method of making the same Download PDF

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Publication number
EP0182930B1
EP0182930B1 EP84114262A EP84114262A EP0182930B1 EP 0182930 B1 EP0182930 B1 EP 0182930B1 EP 84114262 A EP84114262 A EP 84114262A EP 84114262 A EP84114262 A EP 84114262A EP 0182930 B1 EP0182930 B1 EP 0182930B1
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EP
European Patent Office
Prior art keywords
magnetic
permanent
fact
roll according
components
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP84114262A
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German (de)
French (fr)
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EP0182930A1 (en
Inventor
Horst Baermann
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Max Baermann GmbH
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Max Baermann GmbH
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Application filed by Max Baermann GmbH filed Critical Max Baermann GmbH
Priority to DE8484114262T priority Critical patent/DE3472475D1/en
Priority to AT84114262T priority patent/ATE35466T1/en
Priority to EP84114262A priority patent/EP0182930B1/en
Priority to US06/718,637 priority patent/US4638281A/en
Priority to CA000489995A priority patent/CA1240731A/en
Priority to JP60263964A priority patent/JPS61148474A/en
Publication of EP0182930A1 publication Critical patent/EP0182930A1/en
Application granted granted Critical
Publication of EP0182930B1 publication Critical patent/EP0182930B1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—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 formed. 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-B-1 218287, DE-A-3 314 885, DE-A-3 402 864). 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 copiers and which have a homogeneous field distribution on the circumference or the predetermined radius of the magnetic roller. i.e. an equal induction between adjacent poles, as well as for copiers that require magnetic rollers, in which the induction between one or more neighboring poles is different.
  • the particular advantage is therefore that the magnetic roller according to the invention is universal for most types of copiers can be used.
  • 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 with simple means and in a simple manner. Another advantage is that the magnetic roller manufactured according to the invention has a low weight.
  • a magnetic roller 1 is shown according to the invention, which is made of a non-magnetic carrier material 2, such as. B. aluminum.
  • the magnetic roller is with an intermediate air gap 3 from a toner tube 4 made of diamagnetic material, such as. As aluminum or non-magnetic steel, surrounded concentrically.
  • the magnetic roller moves relative to the toner tube around an unillustrated, e.g. B. one- or two-sided ball-bearing shaft.
  • 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.
  • 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 with a predetermined 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 on the predetermined radius.
  • 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 then 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.
  • 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 provided with recesses 5, into which the permanent magnet elements 6 are adjustably fitted and with the aid of Hall probes, not shown, in the manner described above can be adjusted to the required induction at the specified radius.
  • the permanent magnet elements are then fixed with a sprayable plastic 8 or adhesive.
  • This configuration creates a cylindrical hollow rung body 12 in which the permanent magnet elements represent the so-called rungs.
  • the cylindrical hollow sprout body is then filled with a sprayable plastic foam 15.
  • the hollow sprout body 12 is correspondingly trained injection mold 13 brought 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. You can see in this figure the aligned position, for. B. the permanent magnet elements 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 and its derivatives are particularly suitable as foamable plastics. 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. A mixture of the two magnetic materials is also 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. You can also press permanent magnet elements from this mixture, especially if a thermosetting plastic, such as. B. 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 permanent magnet elements can be magnetized in a radial and / or tangential and / or arcuate direction, depending on the type of copying roller required.
  • the magnetization in the radial direction is shown, for example, in the case of 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 in FIG. 4, for example. There this magnetization is identified by the poles N and S in the right permanent magnet element 6.
  • 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. B. aluminum.
  • the strip-shaped carrier body can also be made of magnetically highly conductive material, such as. B. 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 this can known effect can be used to advantage.

Abstract

A magnetic roll for electro-photographic copy machines is provided with a carrier to which strip-shaped permanent magnetic components are fastened in an axial direction. Recesses are provided in the carrier having a cross-section larger than the magnetic components so as to permit selective radial, tangential and pivotal movement for universal positioning of the components within the recess. The components are selectively oriented to provide a predetermined induction value as measured at a predetermined distance outwardly of the carrier or with respect to adjacent poles as determined by discretely located Hall probes. The permanent magnetic components are fixed in the prescribed orientation by an injection moldable plastic material such as a plastic foam.

Description

Die Erfindung bezieht sich auf Magnetwalzen für Kopiergeräte und ein Verfahren zur Herstellung derselben. Derartige Magnetwalzen finden für elektrofotografische Kopiergeräte Verwendung.The invention relates to magnetic rollers for copying machines and a method for producing the same. Such magnetic rollers are used for electrophotographic copiers.

Bei Geräten dieser Art ist die Magnetwalze konzentrisch von einem Tonerrohr, üblicherweise aus diamagnetischem Material, mit geringem Abstand umgeben. Bei diesen Anordnungen bewegt sich das Tonerrohr relativ zur Magnetwalze. Das Tonerrohr dient zusammen mit der Magnetwalze der Zufuhr eines magnetisch anziehbaren Tonerpulvers von einem Pulverbehälter auf ein Trägermaterial, auf dem das elektrostatische Bild erzeugt wird. Hierbei ist es von besonderer Bedeutung, daß das Tonerrohr im Bereich der Entwicklungszone eine gleichmäßige Pulverschicht aufweist. Dies kann aber nur erreicht werden, wenn über dem jeweiligen Pol im Arbeitsbereich der Magnetwalze die geforderte Induktion exakt vorhanden ist.In devices of this type, the magnetic roller is concentrically surrounded by a toner tube, usually made of diamagnetic material, at a short distance. With these arrangements, the toner tube moves relative to the magnetic roller. The toner tube, together with the magnetic roller, serves to supply a magnetically attractable toner powder from a powder container onto a carrier material on which the electrostatic image is formed. 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.

Bei den neueren bekannten Kopiergeräten bestehen die Magnetwalzen aus einem Trägerkörper, auf dem in Achsrichtung verlaufende streifenförmige, kunststoffgebundene Dauermagnete vorgesehen sind (DE-B-1 218287, DE-A-3 314 885, DE-A-3 402 864). Bedingt durch das Herstellungsverfahren und die Magnetisierung der kunststoffgebundenen, vorzugsweise extrudierten Dauermagnetkörper streifenförmiger Gestalt und durch ihre Montage auf dem Trägerkörper der Magnetwalze lassen sich sowohl mechanische Toleranzschwankungen als auch magnetische Schwankungen, die sich in einem ungleichmäßigen Verlauf der Induktion über dem Umfang und der Länge der Magnetwalze bzw. Tonerrohr bemerkbar machen, nicht vermeiden. Diese Schwankungen sind von besonderem Nachteil, da sie zur Streifenbildung auf den hergestellten Kopien führen.In the more recent known copying machines, the magnetic rollers consist of a carrier body on which strip-shaped, plastic-bonded permanent magnets extending in the axial direction are provided (DE-B-1 218287, DE-A-3 314 885, DE-A-3 402 864). 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.

Für die Herstellung von Magnetwalzen ist es von Bedeutung, daß, je nach Bauart und Wirkungsweise, bei einer bestimmten Gruppe von Kopiergeräten am Umfang bzw. dem vorgegebenen Radius der Magnetwalze eine homogene Feldverteilung für alle Magnetstreifen vorhanden sein muß. Bei einer anderen Gruppe von Kopiergeräten werden Magnetwalzen benötigt, bei denen die Induktion zwischen einem oder mehreren benachbarten Polen unterschiedlich hoch ist.For the production of magnetic rollers, it is important that, depending on the design and mode of operation, a homogeneous field distribution for all magnetic strips must be present for a certain group of copying machines on the circumference or the predetermined radius of the magnetic roller. Another group of copiers require magnetic rollers in which the induction between one or more neighboring poles is of different heights.

Es bereitet Schwierigkeiten, bei der Herstellung von Magnetwalzen die jeweils verlangte Kraftliniendichte bzw. Induktion der Dauermagnete bei dem vorgegebenen Radius zu erreichen, weil bedingt durch das Herstellungsverfahren der Dauermagnete - ob gesintert oder kunststoffgebunden - mechanische Toleranzabweichungen, z. B. durch Schrumpfen, und/oder magnetische Toleranzabweichungen durch unterschiedliche Qualitäten des Magnetmaterials der Mischung von kunststoffgebundenen Dauermagneten und bei der Magnetisierung auftreten.It is difficult to achieve the required line density or induction of the permanent magnets at the given radius in the manufacture of magnetic rollers, because due to the manufacturing process of the permanent magnets - whether sintered or plastic-bonded - mechanical tolerance deviations, e.g. B. by shrinking and / or magnetic tolerance deviations due to different qualities of the magnetic material of the mixture of plastic-bonded permanent magnets and magnetization.

Es ist bisher noch nicht gelungen, die einzelnen Magnetwalzen mit genau den gleichen mechanischen und magnetischen Werten herzustellen.So far it has not been possible to manufacture the individual magnetic rollers with exactly the same mechanical and magnetic values.

Darüber hinaus sind bei der Herstellung von Magnetwalzen für Kopiergeräte mit unterschiedlichen Induktionen der Dauermagnete hohe Montagekosten und eine umfangreiche Lagerhaltung an Dauermagneten mit verschiedenen Polstärken erforderlich. Man könnte zwar bei der Herstellung von Magnetwalzen, bei denen verschieden hohe Induktion verlangt werden, die Dauermagnete mit niedrigerer Induktion nicht bis zur Sättigung aufmagnetisieren. Bei einer unvollständigen Aufmagnetisierung treten jedoch im Laufe der Zeit Feldveränderungen, insbesondere eine teilweise bleibende Entmagnetisierung ein, die dann zu schlechten Kopien führen.In addition, the manufacture of magnetic rollers for copiers with different induction of the permanent magnets requires high assembly costs and extensive storage of permanent magnets with different pole strengths. One could not magnetize the permanent magnets with lower induction to saturation in the production of magnetic rollers, in which different levels of induction are required. In the case of incomplete magnetization, however, field changes occur in the course of time, in particular a partially permanent demagnetization, which then leads to poor copies.

Unter Vermeidung dieser Nachteile ist es Aufgabe der Erfindung, eine Magnetwalze für Kopiergeräte der eingangs genannten Art zu schaffen bei der die jeweils geforderte magnetische Induktion der einzelnen Dauermagnetelemente auf dem vorgegebenen Radius genauestens eingehalten werden kann und bei der mechanische und magnetische Toleranzschwankungen über dem Umfang der gesamten Magnetwalze vermieden werden, obwohl die einzelnen Dauermagnetelemente vor ihrer Montage mechanische und magnetische Toleranzabweichungen aufweisen können.Avoiding these disadvantages, it is an object of the invention to provide a magnetic roller for copying machines of the type mentioned in which the magnetic induction of the individual permanent magnetic elements required in each case can be adhered to exactly within the predetermined radius and in which mechanical and magnetic tolerance fluctuations over the entire range Magnetic roller can be avoided, although the individual permanent magnet elements may have mechanical and magnetic tolerance deviations before they are installed.

Diese Aufgabe wird gemäß der Erfindung bei einer Magnetwalze der eingangs genannten Art durch die Merkmale im kennzeichneden Teil des Anspruches 1 sowie bei einem Verfahren zur Herstellung dieser Magnetwalze durch die Merkmale im kennzeichnenden Teil des Anspruches 25 gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved according to the invention in a magnetic roller of the type mentioned by the features in the characterizing part of claim 1 and in a method for producing this magnetic roller by the features in the characterizing part of claim 25. Advantageous further developments and refinements of the invention are specified in the dependent claims.

Durch die Erfindung gelingt es, Magnetwalzen zu schaffen, die über dem vorgegebenen Radius und/oder Bogen- bzw. Winkelmaß stets die gleichen verlangten Induktionswerte besitzen, selbst wenn die einzelnen Dauermagnetelemente Abweichungen in ihren magnetischen und mechanischen Werten aufweisen.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.

Ferner gelingt es durch die Erfindung, Magnetwalzen zu schaffen, die sowohl für Kopiergeräte geeignet sind, die am Umfang bzw. dem vorgegebenen Radius der Magnetwalze eine homogene Feldverteilung. d.h. eine gleich hohe Induktion, zwischen benachbarten Polen verlangen, als auch für Kopiergeräte, die Magnetwalzen erfordern, bei denen die Induktion zwischen einem oder mehreren benachbarten Polen unterschiedlich hoch ist.Furthermore, the invention succeeds in creating magnetic rollers which are suitable both for copiers and which have a homogeneous field distribution on the circumference or the predetermined radius of the magnetic roller. i.e. an equal induction between adjacent poles, as well as for copiers that require magnetic rollers, in which the induction between one or more neighboring poles is different.

Der besondere Vorteil besteht somit darin, daß die Magnetwalze gemäß der Erfindung für die meisten Typen von Kopiergeräten universell einsetzbar ist.The particular advantage is therefore that the magnetic roller according to the invention is universal for most types of copiers can be used.

Ein weiterer Vorteil ist darin zu sehen, daß die bisher erforderliche umfangreiche Lagerhaltung an Dauermagneten mit verschiedenen Polstärken entfällt.Another advantage is the fact that the extensive inventory of permanent magnets with different pole thicknesses that was previously required is no longer required.

Ferner gelingt es durch das erfindungsgemäß vorgeschlagene Verfahren, eine genaue Einregulierung der Dauermagnetelemente auf den verlangten Induktionswert mit einfachen Mitteln und in einfacher Weise vorzunehmen. Ein weiterer Vorteil besteht darin, daß die erfindungsgemäß hergestellte Magnetwalze ein geringes Gewicht aufweist.Furthermore, the method proposed according to the invention enables the permanent magnet elements to be precisely adjusted to the required induction value with simple means and in a simple manner. Another advantage is that the magnetic roller manufactured according to the invention has a low weight.

Nachfolgend sind mehrere Ausführungsbeispiele der Erfindung anhand der Zeichnungen erläutert.Several exemplary embodiments of the invention are explained below with reference to the drawings.

Es zeigen:

  • Fig. 1 einen senkrechten Halbschnitt der Magnetwalze nach der Erfindung,
  • Fig. 2 ein anderes Ausführungsbeispiel der Magnetwalze im senkrechten Halbschnitt,
  • Fig. 3 ein weiteres Ausführungsbeispiel der Magnetwalze in perspektivischer Darstellung, die sich in einer schematisch dargestellten Spritzform befindet,
  • Fig. 4 die Magnetwalze gemäß Fig. 3 im senkrechten Halbschnitt.
Show it:
  • 1 is a vertical half section of the magnetic roller according to the invention,
  • 2 shows another embodiment of the magnetic roller in a vertical half section,
  • 3 shows a further embodiment of the magnetic roller in perspective, which is located in a schematically illustrated injection mold,
  • Fig. 4, the magnetic roller of FIG. 3 in a vertical half-section.

In Fig. 1 ist eine Magnetwalze 1 nach der Erfindung dargestellt, die aus einem unmagnetischen Trägermaterial 2, wie z. B. Aluminium, besteht. Die Magnetwalze ist mit dazwischen liegendem Luftspalt 3 von einem Tonerrohr 4 aus diamagnetischem Material, wie z. B. Aluminium oder unmagnetischem Stahl, konzentrisch umgeben. Die Magnetwalze bewegt sich relativ zum Tonerrohr um eine nicht dargestellte, z. B. ein- oder beidseitig kugelgelagerte Welle.In Fig. 1, a magnetic roller 1 is shown according to the invention, which is made of a non-magnetic carrier material 2, such as. B. aluminum. The magnetic roller is with an intermediate air gap 3 from a toner tube 4 made of diamagnetic material, such as. As aluminum or non-magnetic steel, surrounded concentrically. The magnetic roller moves relative to the toner tube around an unillustrated, e.g. B. one- or two-sided ball-bearing shaft.

Das Trägermaterial 2 der Magnetwalze 1 ist an seinem Umfang mit in Achsrichtung verlaufenden Aussparungen 5 versehen. In diesen Aussparungen sind streifenförmige Dauermagnetelemente 6 justierbar angeordnet. Zu diesem Zweck ist der Querschnitt der Aussparungen größer ausgebildet als der Querschnitt der Dauermagnetelemente.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.

Zum Zwecke der Justierung der Dauermagnetelemente auf den geforderten Induktionswert bei vorgegebenem Radius r und/oder Bogenmaß b zwischen benachbarten Dauermagnetelementen sind im Bereich der Dauermagnetelemente auf dem vorgegebenen Radius Induktionsmessonden, im vorliegenden Fall Hall-Sonden 7, angeordnet. Unter dem vorgegebenen Radius ist der Radius vom Zentrum Z der Magnetwalze bis zu einem bestimmten Abstand über der Magnetwalze, der in den meisten Fällen dem äußeren Umfang des Tonerrohres entspricht, zu verstehen. Bei der Einjustierung der Dauermagnetelemente auf den vorgegebenen Induktionswert ist das Tonerrohr meist noch nicht mit der Magnetwalze montiert. Es genügt, wenn die Hall-Sonden im vorgegebenen Abstand r über dem Umfang der Magnetwalze angeordnet und gehalten sind.For the purpose of adjusting the permanent magnet elements to the required induction value with a predetermined 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 on the predetermined radius. 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. When the permanent magnet elements are adjusted to the specified induction value, 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.

Die Dauermagnetelemente 6 werden durch radiale und/oder tangentiale Verschiebung und/oder Verdrehung in den Aussparungen des Trägermaterials so lange justiert, bis die Hall-Sonden den verlangen Wert der Induktion anzeigen. In diesem justierten Zustand werden dann die Dauermagnetelemente durch einen spritzfähigen Kunststoff 8 in den Aussparungen fixiert. Die Fixierung der Dauermagnetelemente kann auch durch Kleben und/oder Ausgießen mit einem Gießharz oder durch Ausschäumen mit einem Kunststoffschaum vorgenommen werden. Man kann die Dauermagnetelemente auch durch Klemmelemente 16 vor dem Ausspritzen oder Ausschäumen fixieren.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 then 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.

In einem anderen Ausführungsbeispiel gemäß Fig. 2 besteht das Trägermaterial 2 aus einem Nabenkörper 9, von dem sich in radialer Richtung eine Anzahl von Rippen 10 nach außen erstreckt. Die zwischen den Rippen gebildeten Aussparungen 5 nehmen die Dauermagnetelemente 6 auf, die einen segmentförmigen Querschnitt aufweisen. Die Aussparungen sind, wie aus der Zeichnung hervorgeht, im Querschnitt größer ausgebildet als der Querschnitt der Dauermagnetelemente, so daß innerhalb der Aussparungen eine Justierung der Dauermagnetelemente vorgenommen werden kann. Über dem Tonerrohr 4 sind wiederum Hall-Sonden 7 vorgesehen, die während der Einjustierung die geforderte Induktion anzeigen. Sobald die Justierung, wie in Fig. 1 erläutert, erfolgt ist, werden die Dauermagnetelemente wiederum mit einem spritzfähigen Kunststoff 8 fixiert, aus- bzw. umspritzt.In another exemplary embodiment according to FIG. 2, 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. As can be seen from the drawing, 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 been carried out, the permanent magnet elements are in turn fixed with an injectable plastic 8, extruded or extrusion-coated.

Wie aus den Fig. 1 und 2 ersichtlich ist, liegen die justierten Dauermagnetelemente 6 derart innerhalb der Aussparungen 5, daß einmal rechts vom Dauermagnetelemente oder links vom Dauermagnetelement der ausgespritzte Kunststoff vorhanden ist. Es besteht auch die Möglichkeit, daß eines oder mehrere Dauermagnetelemente vollständig von Kunststoff umhüllt sind.As can be seen from FIGS. 1 and 2, 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.

In dem perspektivisch dargestellten weiteren Ausführungsbeispiel gemäß Fig. 3 besteht das Trägermaterial 2 aus zwei scheibenförmigen Endkörpern 11. Die Endkörper sind wiederum mit Aussparungen 5 versehen, in die die Dauermagnetelemente 6 justierbar eingepaßt sind und mit Hilfe von nicht dargestellten Hall-Sonden in der vorbeschriebenen Weise auf die geforderte Induktion bei dem vorgegebenen Radius einreguliert werden. In der einregulierten Stellung sind die Dauermagnetelemente sodann mit einem spritzfähigen Kunststoff 8 oder Kleber fixiert. Durch diese Ausbildung entsteht ein walzenförmiger Sprossenhohlkörper 12, bei dem die Dauermagnetelemente die sogenannten Sprossen darstellen. Der walzenförmige Sprossenhohlkörper wird sodann mit einem spritzfähigen Kunststoffschaum 15 ausgefullt, Zum Zwecke des Ausschäumens wird der Sprossenhohlkörper 12 in eine entsprechend ausgebildete Spritzform 13 gebracht Die Spritzform ist in Fig. 3 schematisch dargestellt. In einer weiteren vorteilhaften Ausgestaltung können nach dem Ausspritzen und Entformen die Endkörper 11 an den in der Zeichnung gestrichelt dargestellten Stellen abgeschnitten werden, um eine besonders leichte und gegen Verformung stabile Magnetwalze zu erhalten. In diesem Falle muß selbstverständlich der nach dem Abschneiden verbleibende Walzenteil die geforderte Länge der Magnetwalze aufweisen. Die Endkörper 11 können auch entfallen, wenn die mehrteilig ausgebildete Spritzform 13 mit seitlich abnehmbaren Deckplatten versehen ist, in die entsprechende Aussparungen zur Aufnahme und Justierung der Dauermagnetelemente eingearbeitet sind.3, the carrier material 2 consists of two disk-shaped end bodies 11. The end bodies are in turn provided with recesses 5, into which the permanent magnet elements 6 are adjustably fitted and with the aid of Hall probes, not shown, in the manner described above can be adjusted to the required induction at the specified radius. In the regulated position, the permanent magnet elements are then fixed with a sprayable plastic 8 or adhesive. This configuration creates a cylindrical hollow rung body 12 in which the permanent magnet elements represent the so-called rungs. The cylindrical hollow sprout body is then filled with a sprayable plastic foam 15. For the purpose of foaming, the hollow sprout body 12 is correspondingly trained injection mold 13 brought The injection mold is shown schematically in Fig. 3. In a further advantageous embodiment, after the injection molding and demolding, 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. In this case, of course, 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.

Die gemäß Fig. 3 hergestellte Magnetwalze ist in Fig. 4 im senkrechten Halbschnitt dargestellt. Das Trägermaterial 2 besteht vollständig aus Kunststoffschaum 15, in dem die Dauermagnetelemente 6 in der ausgerichten Stellung gehalten sind. Man erkennt in dieser Figur die ausgerichtete Stellung, z. B. ist das Dauermagnetelemente 6a in Achsrichtung geringfügig verdreht. Bei der Ausführung gemäß Fig. 4 ist eine Lagerbuchse 14 mit eingespritzt.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. You can see in this figure the aligned position, for. B. the permanent magnet elements 6a is slightly rotated in the axial direction. In the embodiment according to FIG. 4, a bearing bush 14 is also injected.

Die Temperatur des spritzfähigen Kunststoffs 8 oder Kunststoffschaums 15 muß während seiner Verarbeitung in einem solchen Temperaturbereich liegen, daß bei Verwendung von kunststoffgebundenen Dauermagnetelementen dieselben während des Aus- bzw. Umspritzens keine Verformung erleiden, der ausgespritzte Kunststoff jedoch im erkalteten Zustand durch die Erwärmung des Kopiergerätes nicht verformbar ist. Als ausschäumbare Kunststoffe eignen sich besonders Polyurethan und dessen Derivate. Es ist jedoch auch möglich, ein Phenolharz zu verwenden.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 and its derivatives are particularly suitable as foamable plastics. However, it is also possible to use a phenolic resin.

Die Dauermagnetelemente können aus gesintertem, hochkoerzitivem Dauermagnetwerkstoff wie Barium- oder Strontiumferrit, Kobalt-Seltenerdlegierungen oder Neodymeisen bestehen. In einer bevorzugten Ausführung bestehen die Dauermagnetelemente 6 aus einer Mischung eines thermoplastischen Bindemittels und eines pulverförmigen, hochkoerzitiven Dauermagnetmaterials wie Bariumferrit oder Strontiumferrit. Es ist auch eine Mischung aus den beiden Magnetmaterialien möglich. Die Dauermagnetelemente werden durch Extrudieren oder Spritzen geformt. Man kann entweder direkt Dauermagnetstreifen herstellen oder Platten, aus denen dann die einzelnen Streifen geschnitten werden. Man kann aus dieser Mischung auch Dauermagnetelemente pressen, insbesondere dann, wenn ein duroplastischer Kunststoff, wie z. B. Phenolharz, Verwendung findet.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. In a preferred embodiment, 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. A mixture of the two magnetic materials is also 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. You can also press permanent magnet elements from this mixture, especially if a thermosetting plastic, such as. B. phenolic resin, is used.

Der Querschnitt der Dauermagnetelemente kann jede beliebige Gestalt aufweisen. Vorzugsweise besitzen die Dauermagnetelemente einen rechteckigen, quadratischen oder segmentförmigen Querschnitt. Sie können aber auch einen ringabschnitt- oder kreisförmigen Querschnitt aufweisen.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.

Die Magnetisierung der Dauermagnetelemente kann je nach dem verlangten Kopierwalzentyp in radialer und/oder tangentialer und/oder bogenförmiger Richtung vorgenommen werden. Die Magnetisierung in radialer Richtung ist beispielsweise bei dem rechten Dauermagnetelement 6 in Fig. 1 dargestellt. Wie hieraus erkennbar ist, befindet sich der Nordpol, durch ein N gekennzeichnet, auf der dem Tonerrohr 4 zugewandten Oberfläche und der Gegenpol, durch ein S gekennzeichnet, auf der dem Tonerrohr abgewandten Fläche des Dauermagnetelementes. Die tangentiale Magnetisierung der Dauermagnetelemente ist beispielsweise in Fig. 4 dargestellt. Dort ist in dem rechten Dauermagnetelement 6 diese Magnetisierung durch die Pole N und S gekennzeichnet. Die bogenförmige Magnetisierung ist in Fig. 2 bei einem Dauermagnetelement 6 ebenfalls durch die eingezeichneten Buchstaben N und S dargestellt.The permanent magnet elements can be magnetized in a radial and / or tangential and / or arcuate direction, depending on the type of copying roller required. The magnetization in the radial direction is shown, for example, in the case of the right permanent magnet element 6 in FIG. 1. As can be seen from this, 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 in FIG. 4, for example. There this magnetization is identified by the poles N and S in the right permanent magnet element 6. The arcuate magnetization is also shown in FIG. 2 for a permanent magnet element 6 by the letters N and S shown.

Die Dauermagnetelemente sind in dem Trägermaterial bevorzugt so angeordnet, daß die Pole, die zum Tonerrohr hin gerichtet sind, entgegengesetzte Polarität zum Pol des benachbarten Dauermagnetelementes aufweisen.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.

Die Dauermagnetelemente 6 können auf der der Walzenoberfläche abgewandten Seite mit einem streifenförmigen Trägerkörper 17 vorzugsweise durch Kleben verbunden sein, um dem Dauermagnetelement eine größere Stabilität, insbesondere zur Vermeidung wärmebedingter Verformungen, zu verleihen. In diesem Falle können die Dauermagnetelemente eine geringere Dicke aufweisen und in gewissem Sinne sogar flexibel sein. Auch eignet sich diese Ausführung mit dem versteifenden Trägerkörper besonders für die in Fig. 3 und 4 dargestellte Ausführung der Magnetwalze als Sprossenhohlkörper.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. In this case, 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.

In Fig. 4 ist beispielsweise ein Dauermagnetelement 6 mit dem streifenförmigen Trägerkörper 17 dargestellt. Der Trägerkörper kann aus einem magnetisch nicht leitenden Material, wie z. B. Aluminium, bestehen. Der streifenförmige Trägerkörper kann aber auch aus magnetisch gut leitendem Material, wie z. B. Weicheisen, bestehen. In diesem Falle ist es besonders vorteilhaft, die Dauermagnetelemente in radialer Richtung zu magnetisieren, derart, daß sich der eine Pol auf der dem Tonerrohr 4 zugewandten Oberfläche und der Gegenpol auf dem ferromagnetischen Trägerkörper 17 befindet, wie dies in Fig. 1 dargestellt ist. Hierbei steigt die Induktion an der zum Tonerrohr hin gerichteten Oberfläche des Dauermagnetelementes an. Es ist zwar bekannt, daß die Induktion von Dauermagneten ansteigt, wenn diese mit einem Eisenrückschluß versehen werden; im vorliegenden Fall kann dieser bekannte Effekt jedoch vorteilhaft ausgenutzt werden.4 shows, for example, a permanent magnet element 6 with the strip-shaped carrier body 17. The carrier body can be made of a magnetically non-conductive material, such as. B. aluminum. The strip-shaped carrier body can also be made of magnetically highly conductive material, such as. B. soft iron exist. In this case, it is particularly advantageous to magnetize the permanent magnet elements in the radial direction such that the one pole is on the surface facing the toner tube 4 and the opposite pole is on the ferromagnetic carrier body 17, as shown in FIG. 1. Here, 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 this can known effect can be used to advantage.

Claims (29)

1. Magnetic roll for copying machines equipped with a carrier material, where strip-shaped permanent-magnetic components are fastened in axial direction, characterized by the permanent-magnetic components (6) adjustably arranged on the carrier material (2) by radial and/or tangential shifting and/or axial turning in such a way that the magnetic induction reaches the demanded value for each pole, with regard to a given radius (r) and/or arc (b) or angle between neighbouring poles, and in such a way that the permanent-magnetic components are fixed on the carrier material (2) in the position adjusted by means of an induction probe.
2. Magnetic roll according to claim 1 characterized by the fact that the permanent-magnetic components (6) are fixed on the carrier material by means of clamping elements (16).
3. Magnetic roll according to claim 1 characterized by the fact that the permanent-magnetic components (6) are fixed on the carrier material by means of a glue.
4. Magnetic roll according to claim 1 characterized by the fact that the permanent-magnetic components (6) are fixed by means of an injection-mouldable or pourable plastic material (8).
5. Magnetic roll according to claims 1-4 characterized by the fact that the carrier material (2) is equipped on its circumference with recesses (5), which have a larger cross section than the permanent-magnetic components have, for the purpose of adjustment.
6. Magnetic roll according to claim 5 characterized by the fact that the recesses (5) on the carrier material (2) are formed by spot-facing from a roll-shaped solid body.
7. Magnetic roll according to claim 5 characterized by the fact that the recesses (5) on the carrier material (2) are formed by a number of ribs (10) which extend from a centrically arranged hub body (9) into an outer axial direction.
8. Magnetic roll according to claims 1-5 characterized by the fact that the carrier material (2) consists of two disc-shaped bodies at the ends (11) and, if necessary, of one equally large disc-shaped body in the middle, which are equipped with recesses (5), where permanent-
magnetic components (6) are adjustably fitted in so that a roll-shaped hollow body with bars (12) is formed, filled with an injection-mouldable plastic material (8), preferably plastic foam (15).
9. Magnetic roll according to claim 8 characterized by the fact that the discs at the ends (11) are cut off after injecting the roll-shaped hollow body (12).
10. Magnetic roll according to claims 1-9 characterized by the fact that the carrier material (2) consists of an injection-mouldable plastic material (8), preferably plastic foam (15), into which the adjusted permanent-magnetic components (6) are fixed.
11. Magnetic roll according to claim 10 characterized by the fact that on the one hand the injection-mouldable plastic material (8), preferably plastic foam, is processed at temperatures which do not have deforming effects on the permanent-magnetic components (6) during injecting, on the other hand the plastic material, once cooled down, has to be resistant against deformations due to the heating-up of the copying machine.
12. Magnetic roll according to claims 10 or 11 characterized by the fact that the plastic foam (15) consists of Polyurethan and/or its derivatives.
13. Magnetic roll according to claims 10 or 11 characterized by the fact that the injection-mouldable plastic material (8) consists of phenolic resin.
14. Magnetic roll according to claims 1-13 characterized by the fact that the permanent-magnetic components (6) are made of a highly coercive permanent magnet material such as barium or strontium ferrite, cobalt - rare earth alloys or neodymium iron.
15. Magnetic roll according to claim 14 characterized by the fact that the permanent-magnetic components (6) are made of a sintered material.
16. Magnetic roll according to claim 14 characterized by the fact that the permanent-magnetic components (6) are made of a mixture of a thermo-plastic binder, e.g. sulphochloride polyethylene, and a highly coercive permanent magnet material in powder form, processed by extrusion, injection-moulding or press-moulding.
17. Magnetic roll according to claim 14 characterized by the fact that the binder for the permanent-magnetic powder is a curable thermosetting plastic material, e.g. phenolic resin.
18. Magnetic roll according to claims 1-17 characterized by the fact that the permanent-magnetic components (6) have a ring-shaped, circular, rectangular, oval square or segmental cross section.
19. Magnetic roll according to claims 1-18 characterized by the fact that the permanent-magnetic components (6) are magnetized in radial direction so that one pole is situated on the surface directed towards the toner tube (4), surrounding the magnetic roll, while the counter pole is situated on the opposite surface of the permanent-magnetic component.
20. Magnetic roll according to claims 1-18 characterized by the fact that the permanent-magnetic components (6) are magnetized in tangential direction so that the poles of different polarity are situated on the surface of the permanent-magnetic components in an angle of 90 degrees to the radial magnetization.
21. Magnetic roll according to claims 1-18 characterized by the fact that the permanent-magnetic components (6) are magnetized in the form of an arc in such a way that there are two poles of different polarity on the surface of the permanent-magnetic component (6) directed towards the toner tube (4), surrounding the magnetic roll.
22. Magnetic roll according to claims 1-21 characterized by the fact that the permanent-magnetic components (6) are joined with a strip-shaped supporting body (17), preferably by gluing, on the aide opposite the roll surface.
23. Magnetic roll according to claim 22 characterized by the fact that the strip-shaped supporting body (17) consists of a magnetically non-conductive material, preferably aluminium.
24. Magnetic roll according to claim 22 characterized by the fact that the strip-shaped supporting body (17) consists of a magnetically high-conductive material, e.g. soft iron.
25. Method of manufacturing magnetic rolls characterized by a carrier material (2) of one or several sections, where preferably strip-shaped permanent-magnetic components (6), which can be radially and/or tangentially shifted and/or axially turned, are arranged, and/or probes measuring the induction (7), e.g. Hall probes, are arranged on a given radius (r) and/or arc (b) , respectively angle measure in the range of the permanent-magnetic components (6); further characterized by the fact that these components are shifted in radial, respectively tangential direction and/or turned around their axis for adjustment on the carrier material up to the point where the induction measuring probes indicate the demanded induction on the given radius, respectively angle measure between neighbouring poles, thereafter the adjusted permanent-magnetic components are fixed preferably by an injection-mouldable plastic material (8).
26. Method of manufacturing magnetic rolls according to claim 25 characterized by the fact that the carrier material (2) is equipped with recesses (5), where permanent-magnetic components (6) are adjusted by induction measuring probes (7) and fixed thereafter.
27. Method of manufacturing magnetic rolls according to claims 25 and 26 characterized by the fact that the permanent-magnetic components (6) are arranged by means of preferably disc-shaped bodies at the ends (11), then adjusted by means of induction measuring probes (7) to the demanded value of induction, and fixed onto the roll, thereafter the obtained magnetic roll body (12) is put into a mold (13) and a plastic foam (15) is injected.
28. Method of manufacturing magnetic rolls according to claim 27 characterized by the fact that said magnetic roll is cut to the required length after injecting, removing the preferably disc-shaped bodies at the ends (11).
EP84114262A 1984-11-26 1984-11-26 Magnetic rolls for copier machines and method of making the same Expired EP0182930B1 (en)

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 (en) 1984-11-26 1984-11-26 MAGNETIC ROLLER FOR COPY MACHINES AND METHOD OF MANUFACTURE THE SAME.
EP84114262A EP0182930B1 (en) 1984-11-26 1984-11-26 Magnetic rolls for copier machines and method of making the same
US06/718,637 US4638281A (en) 1984-11-26 1985-04-01 Magnetic roll for copy machines and method for manufacturing same
CA000489995A CA1240731A (en) 1984-11-26 1985-09-04 Magnetic roll for copy machines and method for manufacturing same
JP60263964A JPS61148474A (en) 1984-11-26 1985-11-26 Magnetic roller for copying machine and making thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84114262A EP0182930B1 (en) 1984-11-26 1984-11-26 Magnetic rolls for copier machines and method of making the same

Publications (2)

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

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US (1) US4638281A (en)
EP (1) EP0182930B1 (en)
JP (1) JPS61148474A (en)
AT (1) ATE35466T1 (en)
CA (1) CA1240731A (en)
DE (1) DE3472475D1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107235335A (en) * 2017-06-29 2017-10-10 江西电力职业技术学院 Electromagnetism ferrous element pick-up unit and part pick up car

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CA1240731A (en) 1988-08-16
EP0182930A1 (en) 1986-06-04
US4638281A (en) 1987-01-20
JPS61148474A (en) 1986-07-07
ATE35466T1 (en) 1988-07-15
DE3472475D1 (en) 1988-08-04

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