EP0099763B1 - Dispositif pour l'application de particules solides de révélateur sur l'élément d'enregistrement d'une imprimante non impact - Google Patents

Dispositif pour l'application de particules solides de révélateur sur l'élément d'enregistrement d'une imprimante non impact Download PDF

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Publication number
EP0099763B1
EP0099763B1 EP83401000A EP83401000A EP0099763B1 EP 0099763 B1 EP0099763 B1 EP 0099763B1 EP 83401000 A EP83401000 A EP 83401000A EP 83401000 A EP83401000 A EP 83401000A EP 0099763 B1 EP0099763 B1 EP 0099763B1
Authority
EP
European Patent Office
Prior art keywords
magnetic
cylinder
strips
particles
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83401000A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0099763A1 (fr
Inventor
Jean-Philippe Voirin
Bernard Cherbuy
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.)
Bull SA
Original Assignee
Bull SA
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 Bull SA filed Critical Bull SA
Publication of EP0099763A1 publication Critical patent/EP0099763A1/fr
Application granted granted Critical
Publication of EP0099763B1 publication Critical patent/EP0099763B1/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
    • G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—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

  • the present invention relates to a device for applying solid developer particles to the recording element of a non-impact printer.
  • These printing machines In modern equipment which is used for data processing, fast printers are used more and more in which the printing of the characters is carried out without for that calling upon the impact of types of relief printing on a sheet of receiving paper.
  • These printing machines known as non-impact or even without impact transfer, generally include a recording element generally constituted by a rotary drum or an endless belt, on the surface of which one can form, electrostatic or magnetic, sensitized areas also called latent images which correspond to the characters or images to be printed. These images are then developed, that is to say made visible, using a powdery developer which, deposited on the recording element, is only attracted by the sensitized areas thereof. . After which, this recording element is brought into contact with a sheet of paper in order to allow the developer particles which have been deposited on these areas to be transferred onto this sheet to be definitively fixed there.
  • a device which comprises a casing containing the powder developer, this casing having an opening in front of which the recording element passes, the inking of this element being produced by a cylindrical brush which, rotating inside the casing, projects the developer particles towards the surface of the element which passes in front of this opening.
  • this device does not give complete satisfaction to the use of the fact that it causes, on the one hand the formation of a cloud of developer particles which spreads outside the casing, which is particularly unpleasant for people who, being near the printer, are reached by this cloud, on the other hand, an undesirable electrification of the particles which, projected towards the recording element, can then remain on the non-sensitized areas of that - as a result of an electrostatic attraction.
  • this magnetic roller which gives good results when used in an electrostatic charge latent image development apparatus for transporting a powdery developer capable of being attracted magnetically, is not entirely satisfactory when wants to use it as a powdery developer transport roller in a magnetic latent image development apparatus such as, for example, a magnetic printing machine.
  • this magnetic roller is placed in the immediate vicinity of the element for recording the latent magnetic images, this recording element is necessarily subjected to the action of the magnetic fluxes generated by the elements. magnetic tape of this roller, so that the information recorded on this recording element may be greatly altered as it passes in front of this developer applicator roller.
  • this application device comprises a transport roller of the type described in the aforementioned French patent FR-A-1,566,007
  • the developer particles are aligned along the lines of external forces which, on the surface of the transport roller, leave each of the magnetic elements having a north magnetic polarity to join each of the neighboring magnetic elements which have a south magnetic polarity. Since these external lines of force thus form arches oriented perpendicular to the axis of rotation of the roller, the developer particles, by being placed along these lines of force, therefore form chains of particles arranged perpendicular to this axis. .
  • the present invention overcomes this drawback and proposes a device which makes it possible to apply developer particles to the recording element of a non-impact printer, without thereby causing or altering the information recorded on this element, nor streaks of particles on the surface of this element.
  • the present invention relates to a device for applying, onto the recording element of a non-impact printer, solid developer particles contained in a reservoir, this device comprising, on the one hand a roll of transport arranged to bring these particles to the vicinity of the surface of this element, on the other hand a deflector interposed between this element and this transport roller to collect the particles transported by this roller, this deflector having one of its edges disposed at immediate proximity of said element to constitute with this element a bucket having substantially the shape of a dihedral, in which the particles thus collected accumulate, this element being moved in a direction where it entrains these particles towards the edge of said dihedral, the particles entrained beyond this edge remaining applied only to the sensitized areas of said recording element, said developer being capable of being attracted magn ethically, said transport roller being constituted by a rotating cylinder coated, on its outer cylindrical surface, with a magnetic material magnetized so as to present, on its outer face, magnetic poles forming equidistant magnetic lines whose north magnetic polar
  • the printing machine part of which has been shown diagrammatically in FIG. 1, comprises a recording element which is constituted, in the example described, per a magnetic drum 10.
  • This magnetic drum 10 is rotated, in the direction of the arrow F, by an electric motor (not shown).
  • the recording of information on this drum is carried out by a magnetic recording member 11 which is arranged near the external surface of the drum.
  • this recording member 11 is formed of an assembly comprising several magnetic recording heads which, placed one next to the other, are aligned parallel to the axis of rotation 12 of the drum 10.
  • Each of these heads generates, when it is excited repeatedly by an electric current, a variable magnetic field, which has the effect of creating magnetized domains or "magnetic points" on the surface of the drum which passes in front of the organ d recording 11.
  • the moments of excitation of these heads are moreover established, in a known manner, so as to obtain on the surface of the drum sets of magnetic domains 13, called magnetized zones or latent magnetic images, the shape of which corresponds to that of the characters to be printed.
  • These magnetized zones 13 then pass in front of an application device 14 which is arranged below the drum 10 and which makes it possible to apply to the surface of the drum particles of a powdery developer contained in a reservoir 1 5.
  • the particles of developer which are thus applied to the drum 10 adhere, in principle, only on the magnetized areas thereof, so that the magnetized areas which have passed in front of the application device 14 appear coated with a layer of developer , this layer forming, on the drum 10, the image of the characters which are to be printed.
  • this developer consists of magnetic particles in picks of a thermoplastic resin. which, by heating, is capable of melting and fixing on a paper on which it has been deposited.
  • the developer contained in the reservoir 15 may be the one which was the subject of the patent application filed in France by the Applicant on March 20, 1980 and published FR-A-2 478 839.
  • this developer which is applied to the drum 10 mainly adheres to the magnetized zones 13, thus forming deposits 16 of particles on the surface of this drum. These deposits 16 then pass in front of a retouching device 17 which has the role of eliminating the particles which have adhered elsewhere on the magnetized zones 13, as well as the particles which are found in excess in these zones. After which, the developer particles which remain on the drum 10 are transferred, almost entirely, onto a sheet of paper 18 which is applied to the drum 10 by means of a pressure roller 19. The residual developer particles which when this transfer is produced, are still on the drum 10 and are then removed by means of a cleaning device 20, of known type, for example with a brush.
  • the magnetized zones which have passed in front of the cleaning device 20 pass in front of an erasing device 21 where they are then erased, which allows the demagnetized portions of the drum 10 to be able to be magnetized again when they arise next before the registration body 1 1.
  • the application device 14 comprises, on the one hand, a transport element 22 which picks up developer particles from the reservoir 15 to bring them near the surface of the drum 10, on the other hand, a fixed deflector 23 which is interposed between the transport element 22 is the drum 10 to collect the particles transported by this element 22 and apply them to the surface of the drum 10.
  • An application device 14 of this kind has in particular been described and represented in French patent FR-A-2 408 462.
  • the transport element 22 which equips such an application device usually consists of a magnetic roller which will be described later, the axis of rotation 24 of this roller being parallel to the axis of rotation 12 of the drum 10.
  • the deflector 23 which is associated with this magnetic roller 22 is a part which, fixed to the two lateral faces of the reservoir 15, has, as we seen in Figure 2, a he flat face 40 limited by first and second edges 41 and 42 parallel to the axes 12 and 24, the second edge 42 preferably forming a sharp edge to avoid an accumulation of particles on said edge.
  • This deflector 23, which has its first edge 41 practically in contact with the magnetic roller 22 is arranged in such a way that its second edge 42 is in close proximity to the surface of the drum 10 and that its face 40 forms with the plane defined by the axis 12 of the drum and the axis 24 of the magnetic roller a dihedral whose angle is less than forty five degrees.
  • the magnetic roller 22 is rotated, in the direction indicated by the arrow R in Figures 1 and 2, by an electric motor (not shown), this direction being such that the developer particles transported by the magnetic roller 22 are driven towards the face 40 of the deflector 22 and are stopped in passing, at least for most of them, by this deflector.
  • the particles which are thus stopped then accumulate in a trough 43 delimited by the surface of the drum 10 and by the face 40 of the deflector 23.
  • the direction of rotation of the drum 10, indicated by the arrow F is chosen so that the particles accumulated in the bucket 43 are entrained towards the sharp edge 42 of the deflector 23 so that some of them can come to be applied to the magnetized zones 13 of the drum 10.
  • the particles thus entrained by the drum 10 are not stopped in passing by the deflector 23, because it does not touch the drum and that it therefore leaves, between the sharp edge 42 and the drum 10, an opening whose width is sufficient to allow the developer particles entrained by this drum to leave the trough 43.
  • the magnetic roller which has been shown with parts broken away in FIG. 3, is of known type and has been described in French patent FR-A-1,566,007. It will be recalled here that this roller comprises a fixed shaft 25 made up of a material having a high magnetic permeability such as soft iron for example. Magnetic elements 26 are arranged around the shaft 25, these elements being arranged one beside the other, parallel to the shaft 25, so as to form a ring around this shaft. For obvious reasons of simplification, only two magnetic elements referenced 26A and 26B have been shown in FIG. 3, but it should be noted that the number of these elements is much greater than two, this number being chosen so as to be a multiple of two. Thus, in the example illustrated in Figure 3, the roller has eight magnetic elements.
  • This roller further comprises a cylindrical sleeve 27 placed around the ring formed by the magnetic elements and mounted so as to be able to rotate around the shaft 25 in a direction indicated by the arrow R in FIG. 3.
  • This sleeve is produced in a non-magnetic material, such as aluminum for example.
  • the magnetic elements 26 are, as can be seen in FIG. 3, radially magnetized, that is to say in a direction perpendicular to the axis 24 and so that each magnetic element has, on its face 28 located opposite the sleeve 27, a magnetic polarity which is reversed when moving from one magnetic element to the next magnetic element.
  • the outer surface of the sleeve 27 is covered, during its rotation, with a layer of developer particles .
  • some of the developer particles adhere directly to the surface of the sleeve 27, while others will be placed outside this surface, along the external lines of force 29, thus forming chains of particles whose some, indicated by 30 in FIG. 3, are in the form of arches and the others, indicated by 31 in this figure, have the form of portions of arches oriented substantially perpendicular to the surface of the sleeve.
  • all these chains of particles are contained in planes perpendicular to the axis of rotation 24 of the roller.
  • this magnetic roller 22 is formed by a cylinder 50 provided with a shaft 51 allowing it to rotate in bearings, not shown, mounted on the lateral faces of the reservoir 5, these bearings being arranged so that the axis of rotation 24 of this roller is parallel to the axis of rotation 12 of the drum 10.
  • This cylinder 50 is made of a non-magnetic material, such as, for example, copper, glass or plastic. In the example described, it will be considered that this cylinder 50 is made of aluminum.
  • this cylinder 50 is coated, on its outer cylindrical surface, with bands 52 of flexible magnetic material, these bands being contiguous to each other and arranged parallel to the axis of rotation 24 of the cylinder 50.
  • bands 52 are thus arranged on the cylinder 50, each of these bands extending over the entire length of the cylinder.
  • the flexible magnetic material which constitutes these bands is well known and is generally constituted by an elastomer in which magnetic particles have been incorporated.
  • this flexible magnetic material can be that which is manufactured industrially under the name of "Ferriflex" (registered trademark) by the company of Chemicals Ugine-Kuhlmann.
  • each of the strips 52 is magnetized permanently, in a perpendicular direction at its thickness, in order to present on its external face, magnetic poles forming magnetic lines such as 53A, 53B, 53C which are equidistant from each other, the north or south magnetic polarity of these lines alternating from a magnetic line to the other.
  • magnetic lines 53A and 53C shown in FIG. 6 have a north magnetic polarity (N), while the magnetic line 53B has a south magnetic polarity (S).
  • N north magnetic polarity
  • S south magnetic polarity
  • FIGS. 4 5 and 6 these magnetic lines have been symbolically represented in broken lines and are designated in FIGS.
  • FIG. 4 also shows that these magnetic lines 53 are oriented on the surface of the magnetic roller, according to portions of propellers of the same pitch, one of these propellers referenced H, being represented in dashed lines in FIG. 4.
  • the pitch P of these propellers is chosen so as to be numerically equal to the
  • the angle under which the magnetic lines 53 intersect the generatrices of the cylinder is equal to 45 degrees.
  • the portions of propellers formed by the different magnetic lines 53 do not all have the same winding direction.
  • the pitch of these propeller portions is such that, on two contiguous bands 52, the pitch of the propeller portions of one of these two bands is opposite to that of the propeller portions of the 'other band.
  • the number of bands 52 arranged on the cylinder 50 is also chosen so as to be always even, so that the characteristic which has just been stated concerning the pitch of the propeller portions can always be respected.
  • the strips 52 of flexible magnetic material each have a length less than the length of the cylinder 50.
  • the length of each of the bands 52 is equal to half that of the cylinder 50, so that when two of these bands, oriented so that their long side is parallel to the axis of rotation 24 of the cylinder, are placed. end to end on this cylinder, touching by their short side, these two bands extend over the whole the length of the cylinder.
  • each of these cylinder portions is covered with 2n bands 52, 2n being a number peer.
  • the bands covering the cylinder portion 50A have been referenced 52A and those covering the cylinder portion 50B have been referenced 52B.
  • the pitch of the propeller portions along which the magnetic lines 53 of the bands 52A and 52B are oriented is such that, on any two contiguous bands, the pitch of the propeller portions of the one of these two bands is inverse to that of the propeller portions of the other band.
  • each of these p cylinder portions is covered by an even number (equal to 2n) of bands 52.
  • the 2n bands which cover each of the p cylinder portions are contiguous with one another and oriented in parallel to the axis of rotation of the cylinder.
  • the 2n bands of the same cylinder portion are themselves contiguous to the 2n bands of the adjacent cylinder portion and are aligned with the latter.
  • strips 52 of magnetic material which cover the cylinder 50 do not necessarily consist of flexible material incorporating magnetic particles.
  • these strips 52 may be made of a non-flexible magnetic material, for example of ferrite, molded so as to have the shape of a hollow cylinder (or of cylinder portions hollow, such as 52 for example) whose internal diameter corresponds to the external diameter of the cylinder 50, this hollow cylinder being magnetized so as to present, on its external face, magnetic poles, forming magnetic lines extending along portions d propeller arranged analogously to that illustrated in FIGS. 4 and 5.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP83401000A 1982-07-08 1983-05-19 Dispositif pour l'application de particules solides de révélateur sur l'élément d'enregistrement d'une imprimante non impact Expired EP0099763B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8212020 1982-07-08
FR8212020A FR2530044A1 (fr) 1982-07-08 1982-07-08 Dispositif pour l'application de particules solides de revelateur sur l'element d'enregistrement d'une imprimante non-impact

Publications (2)

Publication Number Publication Date
EP0099763A1 EP0099763A1 (fr) 1984-02-01
EP0099763B1 true EP0099763B1 (fr) 1986-07-16

Family

ID=9275814

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Application Number Title Priority Date Filing Date
EP83401000A Expired EP0099763B1 (fr) 1982-07-08 1983-05-19 Dispositif pour l'application de particules solides de révélateur sur l'élément d'enregistrement d'une imprimante non impact

Country Status (5)

Country Link
US (1) US4492178A (hr)
EP (1) EP0099763B1 (hr)
JP (1) JPS599683A (hr)
DE (1) DE3364509D1 (hr)
FR (1) FR2530044A1 (hr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0791802B2 (ja) * 1986-06-12 1995-10-09 大成ロテック株式会社 透水性舗装体
JPH0371132A (ja) * 1989-08-10 1991-03-26 Brother Ind Ltd 顕色剤塗布装置
DE69318641T2 (de) * 1992-01-20 1999-02-11 Seiko Epson Corp Verfahren und vorrichtung zum drucken und kopieren
US20110170914A1 (en) * 2010-01-14 2011-07-14 Grabb Dennis J Magnetic arrangement in a development roller of an electrostatographic printer
CN113399219B (zh) * 2021-07-02 2022-06-17 上海智联精工机械有限公司 Sap颗粒布洒装置及吸收用品设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1270476A (en) * 1970-06-23 1972-04-12 Standard Telephones Cables Ltd Magnetic powder transport mechanisms
US4051484A (en) * 1975-11-03 1977-09-27 Martin Samuel W Magnetic printer and method of performing same
US4170287A (en) * 1977-04-18 1979-10-09 E. I. Du Pont De Nemours And Company Magnetic auger
US4185130A (en) * 1977-04-18 1980-01-22 E. I. Du Pont De Nemours And Company Magnetic image decorator

Also Published As

Publication number Publication date
US4492178A (en) 1985-01-08
FR2530044B1 (hr) 1984-12-07
DE3364509D1 (en) 1986-08-21
JPH0434749B2 (hr) 1992-06-08
EP0099763A1 (fr) 1984-02-01
JPS599683A (ja) 1984-01-19
FR2530044A1 (fr) 1984-01-13

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