EP0086683B1 - Device for the application of solid particles on the recording support of a printing machine - Google Patents

Device for the application of solid particles on the recording support of a printing machine Download PDF

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Publication number
EP0086683B1
EP0086683B1 EP83400099A EP83400099A EP0086683B1 EP 0086683 B1 EP0086683 B1 EP 0086683B1 EP 83400099 A EP83400099 A EP 83400099A EP 83400099 A EP83400099 A EP 83400099A EP 0086683 B1 EP0086683 B1 EP 0086683B1
Authority
EP
European Patent Office
Prior art keywords
particles
transport
deflector
transport member
transport element
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
EP83400099A
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German (de)
French (fr)
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EP0086683A1 (en
Inventor
Raymond Bongrain
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.)
INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Cie
Original Assignee
INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Cie
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Publication of EP0086683A1 publication Critical patent/EP0086683A1/en
Application granted granted Critical
Publication of EP0086683B1 publication Critical patent/EP0086683B1/en
Expired legal-status Critical Current

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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
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0813—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by means in the developing zone having an interaction with the image carrying member, e.g. distance holders
    • 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

Definitions

  • the present application relates to an improvement to the device for applying solid particles to the recording medium of a non-impact printer, described in FR-A-2408462 in the name of the International Company for IT CII- HONEYWELL BULL.
  • Printing machines of this kind generally comprise a recording medium, most often consisting of a rotary drum or an endless belt, on the surface of which it is possible to form, by electrostatic or magnetic means, sensitized zones also called latent images, which correspond to the characters or images to be printed. These latent images are then developed, that is to say made visible, with the aid of a powdery revealing pigment which, deposited on the recording medium, is only attracted by the sensitized zones of the latter. this. After which, the pigment particles which have thus been deposited on these latent images are transferred to a support sheet, such as a sheet of paper for example, on which they are permanently fixed.
  • a support sheet such as a sheet of paper for example
  • a device which comprises a cylindrical casing containing the powdered pigment, this casing having an opening in front of which the recording medium passes, the inking of this medium being produced by a cylindrical brush which, rotating inside the casing, projects the pigment particles towards the surface of the support 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 pigment 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 support, can then remain on the non-sensitized zones of this one consequently of an electrostatic attraction.
  • the device which is described in the above-mentioned patent overcomes these drawbacks. It is a device for applying, on the recording medium of a non-impact printer, solid particles contained in a reservoir, this device comprising a transport element arranged to bring these particles to the vicinity of the surface of this support, said device being characterized in that it further comprises a deflector interposed between this support and this transport element for collecting the particles transported by this element, this deflector having one of its edges disposed in the immediate vicinity of said support for constitute with this support a trough, of substantially prismatic shape, in which the particles thus collected accumulate, this support being displaced in the direction where it entrains these particles towards the edge of said prism, the particles entrained beyond this edge remaining applied only to the sensitized areas of said recording medium.
  • the device described in the aforementioned patent has the drawback of requiring frequent filling of the reservoir with solid particles.
  • the transport element consisting for example of a rotary cylinder, can no longer supply particles to the recording medium as soon as the level of particles in the reservoir falls below the lower end of the element transport.
  • worms are expensive parts.
  • they cannot be completely immersed in the pulverulent pigment because on the one hand, the mechanical power to be supplied for the rotation of these screws is then significant, on the other hand, in the case where the pulverulent pigment consists of particles coated with a thermoplastic resin, this pigment is subjected to crushing and rolling by the screws and the resin melts due to the friction which results therefrom, thus giving agglomerates of particles in the tank; in addition, particles are pushed against the various bearings provided in the walls of the tank to ensure the rotation of the screws and this results in jamming of the corresponding axes of rotation because there are no means that are both simple and suitable for sealing the bearings.
  • the screws supply the transport element with particles in a discontinuous manner, which creates beads of particles on the transport element and, conversely, zones deprived of these particles, which are detrimental for the application of said particles. to the recording medium.
  • the object of the present invention is to remedy the drawback of a supply device comprising, according to the aforementioned patent, only one transport element (associated with a deflector), without however having the drawbacks of a worm device previously mentioned.
  • It relates to a device for applying, on the recording medium of a non-impact printer, solid particles according to claim 1 of the main patent, characterized in that it further comprises a shaped transport member cylindrical, designed to bring, by rotation about its axis, particles in the vicinity of the transport element, as well as another deflector interposed between this transport member and this transport element to allow the transfer of particles from the transport member to the transport element.
  • a cylindrical transport member is less expensive than a worm, can be completely immersed in the particle powder and allows this powder, due to the symmetry of this member, to arrive regularly. on the transport element, without seizing of bearings and without the formation of agglomerates of particles.
  • this device also comprises a means for mixing the particles in the reservoir.
  • This stirring means causes a re-spreading of the powder in the reservoir, which avoids any local exhaustion thereof.
  • the device according to the invention further comprises at least one other transport member of cylindrical shape, provided for supplying, by rotation about its axis, said transport member with particles, by means of a deflector interposed between said member and said other transport member, so as to have a reserve of particles in the tank itself.
  • said other deflector extends over a length of the order of a centimeter, between said element and said transport member, and leaves between itself and this transport member a space at most equal to a millimeter and between itself and said transport element, a space of the order of 5 mm.
  • the solid particles being attracted by a magnet, said transport member and said transport element are magnetic on the surface.
  • FIG. 1 there is shown schematically a particular embodiment of the application device 5 object of the invention in the case of a magnetic printer.
  • a part of this printer is schematically represented in FIG. 1. It comprises, as explained in the aforementioned patent, a recording medium constituted, in the example described, by a magnetic drum 2 driven in rotation, in the direction of arrow F l , by an electric motor (not shown).
  • the recording of information on this drum is carried out by a magnetic recording member 3.
  • this member 3 is formed by an assembly comprising several magnetic recording heads which, placed one beside the others, are aligned parallel to the axis of rotation A i of the drum 2.
  • Each of these heads generates, when it is excited repeatedly by an electric current, a variable magnetic field, which has the effect of creating domains magnetized 4, or "magnetic dots", on the surface of the drum which passes in front of the recording member 3, the instants of excitation of these heads being established in known manner, so as to obtain on this surface of the drum zones magnetized, which are sets of said domains 4, sets also called latent images and whose shape corresponds to that of the characters to be printed.
  • the magnetized areas of the drum then pass in front of the application device 5 which is arranged below the drum 2 and which makes it possible to apply to the surface of the drum particles of a pulverulent pigment P contained in a reservoir 6.
  • this pigment consists of magnetic particles coated with a resin which, by heating, is capable of melting and fixing on a paper on which it has been deposited. It should however be pointed out that the nature of this pigment is not specific to the invention and that, in the case of an electrostatic printer to which of course the invention applies, this pigment could very well consist of a known powder containing no magnetic particles.
  • the pigment mainly adheres to the magnetized areas 4, thus forming deposits 7 of particles (FIG. 2) on the surface of the drum 2.
  • Touch-up means consisting of a rotating magnetic cylinder 8 disposed in the vicinity of the drum 2 are then provided for eliminate the particles having adhered elsewhere than on the magnetized domains 4 as well as the particles in excess on said domains.
  • a small deflector 8b is arranged near the cylinder 8 retouching to cause the particles captured by this retouching cylinder to fall back into the tank 6. But this retouching 8 creates chains of particles which lie on the drum 2 and which one seeks to eliminate by means of another retouching by suction 9.
  • the particles are transferred to a support sheet such that 'a sheet of paper 10 applied against the drum by means of a transfer roller 11.
  • the particles which remain on the drum are removed in a cleaning station 12 then the magnetic points are erased by an erasing module 13, at after which a new printing cycle can take place.
  • the application device 5 comprises, on the one hand, a transport element 14, which removes particles of pigment from the reservoir 6, when the level of the particles is sufficient raised in this tank, to bring them near the surface of the drum 2, on the other hand, a fixed deflector 15 which is interposed between the transport element 14 and the drum 2 to collect the particles transported by this element 14 and apply them to the surface of the drum 2.
  • the transport element 14 consists for example of a magnetic cylinder whose axis of rotation A 2 is parallel to the axis A, of the drum 2 and can rotate in two bearings not shown, which are respectively provided with the side faces of the reservoir 6. Only the rear side face 16 is shown in Figure 1, the front side face, located in front of Figure 1, not being shown.
  • the deflector 15, shown in FIG. 2, is a part fixed to the two lateral faces of the tank 6 and having a planar face 17 limited by a first and a second edge 18 and 19 parallel to the axes A, and A 2 , the second edge 19 preferably forming a sharp edge to avoid an accumulation of particles on said edge.
  • the deflector 15 is arranged so that its face 17 forms, with the plane defined by the axis A, of the drum and the axis A 2 of the element, a dihedral whose edge is formed by the first edge 18 and is close to the transport element 14 and whose angle is less than 45 degrees. Furthermore, this deflector 15 is provided so that the sharp edge 19 is in the vicinity of the drum 2.
  • the deflector 15 is constituted by a semi-cylindrical rod arranged so that said flat face 17 (c ' i.e. the diametral plane defining this rod) contains the axes A, and A 2 .
  • the transport element 14 has a direction of rotation, indicated by the arrow F 2 in FIG. 2, intended to drive the particles towards this face 17.
  • the space between the transport element and the first edge 18 of the deflector is chosen low enough so that the particles are mostly stopped in passing by the deflector 15 and then accumulate in a trough 20 delimited by the surface of the transport element 14 and by the face 17 of the deflector 15.
  • the direction of rotation of the drum 2, indicated by the arrow F, in FIG. 2 is chosen so that the particles accumulated in the bucket 20 are entrained towards the sharp edge 19 of the deflector 15, so that part of between them can be applied to the magnetized areas of the drum 2.
  • the particles thus entrained by the drum 2 are not stopped in passing by the deflector 15, owing to the fact that the latter does not touch the surface of the drum and which it therefore leaves, between the edge v ive 19 and the drum, an opening whose width is sufficient to allow the pigment particles entrained by the drum to exit from the bucket 20.
  • the pigment particles which, applied to the magnetized zones of the drum, exit from the bucket 20, continue to adhere to these zones and thus make visible the characters which must be printed while those which leave the bucket 20 without being retained by the drum generally fall back into the tank 6.
  • the application device 5 further comprises, on the one hand, a transport member 21 which removes particles of pigment from the reservoir 6 to bring them in the vicinity of the surface of the transport element 14, on the other hand, another deflector 22 which is interposed between the transport member 21 and the transport element 14 to collect the particles transported by the transport member 21 and transfer them to the surface of the transport element 14.
  • Said transport member 21 is disposed in the reservoir 6, below the transport element 14 and consists of a cylinder which is magnetic in the example described and whose axis A 3 of rotation is parallel to the axes A, and A 2 previously defined and can rotate in two bearings not shown, which are provided with the lateral faces of the reservoir 6.
  • the other deflector 22, shown in FIG. 2, is a part fixed to the two lateral faces. of the reservoir 6 and having a flat face 23 limited by a first and a second edge 24 and 25 parallel to the axis A 2 of the transport element 14 and to the axis A 3 of the transport member 21.
  • the other deflector 22 is arranged so that its planar face 23 forms, with the plane defined by the axes A 2 and A 3 , a dihedral whose edge is formed by the first edge 24 and is close to the member 21 of transport and whose angle is less than 45 degrees.
  • the other deflector 22 is provided so that its second edge 25 is in the vicinity of the transport element 14.
  • the other deflector 22 is constituted by a semi-cylindrical rod arranged so that its flat face 23 (that is to say the diametral plane defining this rod) contains the axes A 2 and A 3 '''
  • the transport member 21 has a direction of rotation indicated by an arrow F 3 in FIG. 2 and provided, as a function of the direction of rotation of the transport element 14, for driving the particles towards the flat face 23 of the deflector 22 , particles which are then entrained towards the transport element 14.
  • the directions of rotation are such that an upward movement of parties is created. pigment cules.
  • the seating faces 17 and 23 are turned to the left, the member 21 and the transport element 14 rotate clockwise and the drum 2, in the direction reverse.
  • the deflector 15 which is interposed between the magnetic drum 2 and the transport element 14, is essentially intended to ensure proper application of pigment particles on this drum 2, while preventing the magnetized domains 4 which have been formed on this drum from being greatly altered at the moment when, passing in front of the transport element 14, they are subjected to the action of magnetic fluxes of dispersion generated by this element 14.
  • the other deflector 22, which is interposed between the transport element 14 and the transport member 21, has essentially the purpose, when the level of particles in the tank 6 becomes lower than that of the top of the member 21, to ensure a consumable reserve of particles which makes it possible to regularly supply particles with the transport element 14 and provides a good distribution of the particles on the surface of this element Even if, as a result of slight variations in the driving speed of the transport member 21, for example, the arrival of the particles in this reserve becomes irregular.
  • a means 27 for mixing the pulverulent pigment is added to the reservoir 6.
  • This mixing means 27 has an axis of rotation A 4 parallel to that of the transport member 21 and carried by two bearings, not shown, placed on the lateral faces of the tank 6.
  • said mixing means 27 is by example placed at the same level as the transport member 21. We can also place this transport member 21 at the bottom of the tank 6, so that the maximum of particles of said tank is consumed.
  • a particular embodiment of the stirring means 27 is shown diagrammatically and in part in FIG. 4. It essentially comprises the axis A 4 of rotation and two rods 27a and 27b taking the form of slots, made integral with said axis and arranged perpendicularly to each other.
  • the rotation of the stirring means 27 is for example intended to take place in a direction, indicated by the arrow F, in FIG. 1, identical to that of the rotation of the transport member 21.
  • the capacity of the reservoir 6 can be further increased by increasing its depth, which is shown by dashed lines 6a in FIG. 1, and by placing in this reservoir another transport member 28, constituted by a magnetic cylinder and placed below said transport member 21.
  • the axis of rotation A s of this other member 28 is parallel to the axis A 3 and carried by two bearings, not shown, placed in the lateral faces of the tank 6.
  • a third deflector 29 is interposed between said member 21 and said other transport member 28. This other member 28 thus feeds the transport member 21 with particles, via the third deflector 29.
  • This third deflector 29 is fixed to the lateral faces of the tank 6, is for example constituted like the other deflector 22, thus presents a flat face 30 and is disposed, between the other member 28 and the transport member 21, as is arranged the other deflector ⁇ 22, between this transport member 21 and the transport element 14.
  • the direction of rotation of said other member 28, represented by an arrow F s in FIG. 1, is then chosen identical to that of said transport member 21.
  • Qn can arrange the element 14, the member 21 and the other transport member 28 so that their respective axes of rotation are in the same plane and arrange the other deflector 22 and the third deflector 29 so that they have their respective flat faces 23 (Figure 2) and 30 ( Figure 1) in said plane.
  • Another means 31 of stirring can also be added in the reservoir 6, at the level of the other transport member 28.
  • the particles can then pass from a maximum level 32 to a minimum level 33 corresponding to the bottom of the other transport member 28.
  • the latter does not intervene, but it contributes to supplying the drum 2 with particles when the level of these particles has dropped sufficiently to be at the level of this other member 28.
  • a level sensor could be provided to indicate to the users of the printer when the minimum level 33 is reached.
  • FIG. 3 there is shown schematically a particular embodiment of the transport member 21. It comprises a cylinder 21a of axis A 3 , coated with a strip 21b which is permanently magnetized and which is formed, in the example described, by rubber in which metallic particles are permanently magnetized.
  • FIG. 3 shows that this strip 21b has been magnetized so as to present on its external face 21c successive magnetized zones 21 whose polarity is such that any two consecutive magnetization zones have opposite magnetic polarities.
  • the polarity of these successive magnetized zones is alternately north and south, the north and south poles being designated, in FIG. 3, respectively by the letters N and S. Under these conditions, part of the pigment particles found in the reservoir 6 ( Figure 1) is attracted by the strip 21b.
  • the mode of magnetization of the strip 21b which has just been described is not exclusive of the invention and one could use any other mode of magnetization allowing the strip 21b to attract the pigment particles.
  • the other transport member 28 and the transport element 14 can be produced in the same way.
  • the sliding cover 34 of the reservoir 6 is also seen, this cover being stopped by a stop 35 so as not to damage the drum 2.
  • a part of the pinions allowing the rotation of the retouching means 8 (pinion 8a), of the transport element 14 (pinion 14a), of the transport member 21 (pinion 21a) and of the threshing means 27 (pinion 27c).
  • the pinion allowing the rotation of the other transport member 28, nor that which allows the rotation of the other threshing means 31 has not been shown.
  • some of the intermediate pinions 36 necessary to obtain suitable directions of rotation as well as the motor pinion 37 driven by a motor not shown and allowing the drive of all the other pinions.
  • This set of pinions can be produced by a person skilled in the art and placed outside the tank 6, for example on the other side of the external face 16 in FIG. 1.
  • the deflector 22 and the other deflector 29 are made of a magnetic material
  • the distances D1, D2, D3, D4 ( Figure 2) respectively between the drum 2 and the deflector 15, between the latter and the transport element 14, between the latter and the other deflector 22, between the latter and the other transport member 21, are respectively equal to 1 mm, 0.5 mm, 5 mm, 0.5 mm
  • the respective widths L1 and L2 of the faces 17 and 23 are of the order of 1 cm
  • the respective rotational speeds of the transport element 14 and of the transport member 21 are respectively of the order of 50 revolutions per minute and 30 revolutions per minute.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Non-Mechanical Conveyors (AREA)
  • Ink Jet (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Description

La présente demande a pour objet un perfectionnement au dispositif pour l'application de particules solides sur le support d'enregistrement d'une imprimante non-impact, décrit dans FR-A-2408462 au nom de la Compagnie Internationale pour l'informatique CII-HONEYWELL BULL.The present application relates to an improvement to the device for applying solid particles to the recording medium of a non-impact printer, described in FR-A-2408462 in the name of the International Company for IT CII- HONEYWELL BULL.

Il s'applique à la réalisation de machines imprimantes connues, dites non-impact ou encore à transfert sans frappe, dans lesquelles l'impression des caractères est réalisée sans pour cela faire appel à l'impact de types d'impression en relief sur une feuille de papier réceptrice.It applies to the production of known printing machines, called non-impact or transfer without typing, in which the printing of the characters is carried out without for this calling upon the impact of types of relief printing on a receiving sheet of paper.

Les machines imprimantes de ce genre comportent généralement un support d'enregistrement, constitué le plus souvent par un tambour rotatif ou une courroie sans fin, à la surface duquel on peut former, par voie électrostatique ou magnétique, des zones sensibilisées appelées également images latentes, qui correspondent aux caractères ou images à imprimer. Ces images latentes sont ensuite développées, c'est-à-dire rendues visibles, à l'aide d'un pigment révélateur en poudre qui, déposé sur le support d'enregistrement, n'est attiré que par les zones sensiblilisées de celui-ci. Après quoi, les particules de pigment qui ont été ainsi déposées sur ces images latentes sont transférées à une feuille de support, telle qu'une feuille de papier par exemple, sur laquelle elles sont fixées d'une manière permanente.Printing machines of this kind generally comprise a recording medium, most often consisting of a rotary drum or an endless belt, on the surface of which it is possible to form, by electrostatic or magnetic means, sensitized zones also called latent images, which correspond to the characters or images to be printed. These latent images are then developed, that is to say made visible, with the aid of a powdery revealing pigment which, deposited on the recording medium, is only attracted by the sensitized zones of the latter. this. After which, the pigment particles which have thus been deposited on these latent images are transferred to a support sheet, such as a sheet of paper for example, on which they are permanently fixed.

Pour appliquer ce pigment révélateur pul- vérulen sur le support d'enregistrement d'une machine imprimante de ce genre, on a utilisé, dans l'art antérieur, divers dispositifs d'application. C'est ainsi, par exemple, que l'on a employé un dispositif qui comporte un carter cylindrique contenant le pigment en poudre, ce carter présentant une ouverture devant laquelle passe le support d'enregistrement, l'encrage de ce support étant réalisé par une brosse cylindrique qui, tournant à l'intérieur du carter, projette les particules de pigment vers la surface du support qui défile devant cette ouverture. Toutefois, ce dispositif ne donne pas entière satisfaction à l'usage du fait qu'il provoque, d'une part la formation d'un nuage de particules de pigment qui se répand à l'extérieur du carter, ce qui est particulièrement désagréable pour les personnes qui, se trouvant à proximité de l'imprimante, sont atteintes par ce nuage, d'autre part, une électrisation indésirable des particules qui, projetées vers le support, peuvent alors subsister sur les zones non sensibilisées de celui-ci par suite d'une attraction électrostatique.In order to apply this pulverulent revealing pigment to the recording medium of a printing machine of this kind, various application devices have been used in the prior art. Thus, for example, a device was used which comprises a cylindrical casing containing the powdered pigment, this casing having an opening in front of which the recording medium passes, the inking of this medium being produced by a cylindrical brush which, rotating inside the casing, projects the pigment particles towards the surface of the support which passes in front of this opening. However, 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 pigment 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 support, can then remain on the non-sensitized zones of this one consequently of an electrostatic attraction.

Le dispositif qui est décrit dans le brevet suscité remédie à ces inconvénients. C'est un dispositif d'application, sur le support d'enregistrement d'une imprimante non-impact, de particules solides contenues dans un réservoir, ce dispositif comprenant un élément de transport disposé pour amener ces particules au voisinage de la surface de ce support, ledit dispositif étant caractérisé en ce qu'il comporte en outre un déflecteur interposé entre ce support et cet élément de transport pour recueillir les particules transportées par cet élément, ce déflecteur ayant l'un de ses bords disposé à proximité immédiate dudit support pour constituer avec ce support un auget, de forme sensiblement prismatique, dans lequel viennent s'accumuler les particules ainsi recueillies, ce support étant déplacé dans le sens où il entraîne ces particules vers l'arête dudit prisme, les particules entraînées au-delà de cette arête ne restant appliquées que sur les zones sensibilisées dudit support d'enregistrement.The device which is described in the above-mentioned patent overcomes these drawbacks. It is a device for applying, on the recording medium of a non-impact printer, solid particles contained in a reservoir, this device comprising a transport element arranged to bring these particles to the vicinity of the surface of this support, said device being characterized in that it further comprises a deflector interposed between this support and this transport element for collecting the particles transported by this element, this deflector having one of its edges disposed in the immediate vicinity of said support for constitute with this support a trough, of substantially prismatic shape, in which the particles thus collected accumulate, this support being displaced in the direction where it entrains these particles towards the edge of said prism, the particles entrained beyond this edge remaining applied only to the sensitized areas of said recording medium.

Cependant, le dispositif décrit dans le brevet sus-cité présente l'inconvénient de nécessiter un remplissage fréquent du réservoir de particules solides. En effet, l'élément de transport, consistant par exemple en un cylindre rotatif, ne peut plus alimenter en particules le support d'enregistrement dès que le niveau des particules dans le réservoir tombe au-dessous de l'extrémité inférieure de l'élément de transport.However, the device described in the aforementioned patent has the drawback of requiring frequent filling of the reservoir with solid particles. Indeed, the transport element, consisting for example of a rotary cylinder, can no longer supply particles to the recording medium as soon as the level of particles in the reservoir falls below the lower end of the element transport.

Pour remédier à cet inconvénient, on peut imaginer de disposer une première vis sans fin au-dessous de l'élément de transport pour amener les particules solides à ce dernier, ainsi qu'une seconde vis sans fin disposée parallèlement à la première et de pas contraire à celle-ci pour compenser le déplacement latéral des particules causé par la première vis au cas où cette première vis serait seule à fonctionner. On évite ainsi un épuisement local du réservoir, du fait du brassage des particules, résultant du mouvement des deux vis, et l'on n'a plus besoin de remplir fréquemment ce réservoir.To overcome this drawback, one can imagine having a first worm below the transport element to bring the solid particles to the latter, and a second worm arranged parallel to the first and not contrary to this to compensate for the lateral displacement of the particles caused by the first screw in case this first screw is the only one to function. This avoids local exhaustion of the tank, due to the mixing of particles, resulting from the movement of the two screws, and there is no longer any need to frequently fill this tank.

Néanmoins, les vis sans fin sont des pièces coûteuses. De plus, elles ne peuvent être totalement plongées dans le pigment pulvérulent car d'une part, la puissance mécanique à fournir pour la rotation de ces vis est alors importante, d'autre part, dans le cas où le pigment pulvérulent est constitué de particules enduites d'une résine thermoplastique, ce pigment est soumis à un broyage et à un laminage de la part des vis et la résine fond du fait des frottements qui en résultent, donnant ainsi des agglomérats de particules dans le réservoir; de plus, des particules sont repoussées contre les différents paliers prévus dans les parois du réservoir pour assurer la rotation des vis et il en résulte des grippages des axes de rotation correspondants car on ne trouve pas de moyens à la fois simples et convenables pour étancher les paliers. Par ailleurs, les vis alimentent l'élément de transport en particules de façon discontinue, ce qui crée sur l'élément de transport des bourrelets de particules et, inversement, des zones privées de ces particules, qui sont préjudiciables pour l'application desdites particules au support d'enregistrement.However, worms are expensive parts. In addition, they cannot be completely immersed in the pulverulent pigment because on the one hand, the mechanical power to be supplied for the rotation of these screws is then significant, on the other hand, in the case where the pulverulent pigment consists of particles coated with a thermoplastic resin, this pigment is subjected to crushing and rolling by the screws and the resin melts due to the friction which results therefrom, thus giving agglomerates of particles in the tank; in addition, particles are pushed against the various bearings provided in the walls of the tank to ensure the rotation of the screws and this results in jamming of the corresponding axes of rotation because there are no means that are both simple and suitable for sealing the bearings. Furthermore, the screws supply the transport element with particles in a discontinuous manner, which creates beads of particles on the transport element and, conversely, zones deprived of these particles, which are detrimental for the application of said particles. to the recording medium.

La présente invention a pour but de remédier à l'inconvénient d'un dispositif d'alimentation ne comportant, selon le brevet sus-cité, qu'un élément de transport (associé à un déflecteur), sans toutefois présenter les inconvénients d'un dispositif à vis sans fin précédemment mentionnés.The object of the present invention is to remedy the drawback of a supply device comprising, according to the aforementioned patent, only one transport element (associated with a deflector), without however having the drawbacks of a worm device previously mentioned.

Elle a pour objet un dispositif d'application, sur le support d'enregistrement d'une imprimante non-impact, de particules solides selon la revendication 1 du brevet principal, caractérisé en ce qu'il comprend en outre un organe de transport de forme cylindrique, prévu pour amener, par rotation autour de son axe, des particules au voisinage de l'élément de transport, ainsi qu'un autre déflecteur interposé entre cet organe de transport et cet élément de transport pour permettre le transfert des particules de l'organe de transport à l'élément de transport.It relates to a device for applying, on the recording medium of a non-impact printer, solid particles according to claim 1 of the main patent, characterized in that it further comprises a shaped transport member cylindrical, designed to bring, by rotation about its axis, particles in the vicinity of the transport element, as well as another deflector interposed between this transport member and this transport element to allow the transfer of particles from the transport member to the transport element.

Avec ce dispositif, on évite un épuisement trop rapide du réservoir. Par ailleurs, un organe de transport de forme cylindrique est moins coûteux qu'une vis sans fin, peut être plongé compléte- ment dans la poudre de particules et permet à cette poudre, du fait de la symétrie de cet organe, d'arriver régulièrement sur l'élément de transport, sans grippage de paliers et sans formation d'agglomérats de particules.With this device, it avoids too rapid exhaustion of the tank. In addition, a cylindrical transport member is less expensive than a worm, can be completely immersed in the particle powder and allows this powder, due to the symmetry of this member, to arrive regularly. on the transport element, without seizing of bearings and without the formation of agglomerates of particles.

Selon une caractéristique particulière du dispositif objet de l'invention, ce dispositif comprend en outre un moyen de brassage des particules dans le réservoir. Ce moyen de brassage provoque un réétalage de la poudre dans le réservoir, ce qui évite tout épuisement local de celle-ci.According to a particular characteristic of the device which is the subject of the invention, this device also comprises a means for mixing the particles in the reservoir. This stirring means causes a re-spreading of the powder in the reservoir, which avoids any local exhaustion thereof.

Selon une autre caractéristique particulière, le dispositif selon l'invention comprend en outre au moins un autre organe de transport de forme cylindrique, prévu pour alimenter, par rotation autour de son axe, ledit organe de transport en particules, par l'intermédiaire d'un déflecteur interposé entre ledit organe et ledit autre organe de transport, de façon à disposer d'une réserve de particules dans le réservoir lui-même.According to another particular characteristic, the device according to the invention further comprises at least one other transport member of cylindrical shape, provided for supplying, by rotation about its axis, said transport member with particles, by means of a deflector interposed between said member and said other transport member, so as to have a reserve of particles in the tank itself.

Selon une autre caractéristique particulière, ledit autre déflecteur s'étend sur une longueur de l'ordre d'un centimètre, entre ledit élément et ledit organe de transport, et laisse entre lui-même et cet organe de transport un espace au plus égal à un millimètre et entre lui-même et ledit élément de transport, un espace de l'ordre de 5 mm.According to another particular characteristic, said other deflector extends over a length of the order of a centimeter, between said element and said transport member, and leaves between itself and this transport member a space at most equal to a millimeter and between itself and said transport element, a space of the order of 5 mm.

Enfin, selon une autre caractéristique particulière, les particules solides étant attirables par un aimant, ledit organe de transport et ledit élément de transport sont magnétiques en surface.Finally, according to another particular characteristic, the solid particles being attracted by a magnet, said transport member and said transport element are magnetic on the surface.

L'invention sera mieux comprise à la lecture de la description qui suit d'exemples de réalisation donnés à titre indicatif et non limitatif en référence aux dessins annexés sur lesquels:

  • - la figure 1 est une vue schématique d'un mode de réalisation particulier du dispositif objet de l'invention dans le cas d'une imprimante magnétique,
  • - la figure 2 est une vue schématique montrant le mouvement des particules d'une part, au voisinage du déflecteur interposé entre l'élément de transport et le support d'enregistrement, d'autre part, au voisinage de l'autre déflecteur interposé entre l'organe de transport et l'élément de transport,
  • - la figure 3 est une vue schématique en coupe d'un mode de réalisation particulier d'un organe de transport de particules utilisé dans le dispositif de la figure 1, et
  • - la figure 4 est une vue schématique d'un mode de réalisation particulier d'un moyen de brassage également utilisé dans le dispositif de la figure 1.
The invention will be better understood on reading the following description of exemplary embodiments given by way of non-limiting example with reference to the appended drawings in which:
  • FIG. 1 is a schematic view of a particular embodiment of the device which is the subject of the invention in the case of a magnetic printer,
  • - Figure 2 is a schematic view showing the movement of the particles on the one hand, in the vicinity of the deflector interposed between the transport element and the recording medium, on the other hand, in the vicinity of the other deflector interposed between the transport member and the transport element,
  • FIG. 3 is a schematic sectional view of a particular embodiment of a particle transport member used in the device of FIG. 1, and
  • - Figure 4 is a schematic view of a particular embodiment of a stirring means also used in the device of Figure 1.

Sur la figure 1, on a représenté schématiquement un mode de réalisation particulier du dispositif d'application 5 objet de l'invention dans le cas d'une imprimante magnétique. Une partie de cette imprimante est schématiquement représentée sur la figure 1. Elle comprend, comme cela est expliqué dans le brevet sus-cité, un support d'enregistrement constitué, dans l'exemple décrit, par un tambour magnétique 2 entraîné en rotation, dans le sens de la flèche Fl, par un moteur électrique (non représenté). L'enregistrement d'informations sur ce tambour est réalisé par un organe d'enregistrement magnétique 3. Dans l'exemple décrit, cet organe 3 est formé d'un ensemble comprenant plusieurs têtes d'enregistrement magnétique qui, placées les unes à côté des autres, sont alignées parallèlement à l'axe de rotation Ai du tambour 2. Chacune de ces têtes engendre, lorsqu'elle est excitée à différentes reprises par un courant électrique, un champ magnétique variable, ce qui a pour effet de créer des domaines magnétisés 4, ou "points magnétiques", sur la surface du tambour qui défile devant l'organe d'enregistrement 3, les instants d'excitation de ces têtes étant établis de manière connue, de façon à obtenir sur cette surface du tambour des zones magnétisées, qui sont des ensembles desdits domaines 4, ensembles appelés également images latentes et dont la forme correspond à celle des caractères à imprimer. Les domaines magnétisés du tambour passent ensuite devant le dispositif d'application 5 qui est disposé au-dessous du tambour 2 et qui permet d'appliquer sur la surface du tambour des particules d'un pigment pulvérulent P contenu dans un réservoir 6. Dans l'exemple décrit, ce pigment est constitué de particules magnétiques enduites d'une résine qui, par chauffage, est capable de fondre et de se fixer sur un papier sur lequel elle a été déposée. Il faut cependant signaler que la nature de ce pigment n'est pas spécifique de l'invention et que, dans le cas d'une imprimante électrostatique à laquelle bien entendu s'applique l'invention, ce pigment pourrait très bien être constitué d'une poudre connue ne comportant aucune particule magnétique.In Figure 1, there is shown schematically a particular embodiment of the application device 5 object of the invention in the case of a magnetic printer. A part of this printer is schematically represented in FIG. 1. It comprises, as explained in the aforementioned patent, a recording medium constituted, in the example described, by a magnetic drum 2 driven in rotation, in the direction of arrow F l , by an electric motor (not shown). The recording of information on this drum is carried out by a magnetic recording member 3. In the example described, this member 3 is formed by an assembly comprising several magnetic recording heads which, placed one beside the others, are aligned parallel to the axis of rotation A i of the drum 2. Each of these heads generates, when it is excited repeatedly by an electric current, a variable magnetic field, which has the effect of creating domains magnetized 4, or "magnetic dots", on the surface of the drum which passes in front of the recording member 3, the instants of excitation of these heads being established in known manner, so as to obtain on this surface of the drum zones magnetized, which are sets of said domains 4, sets also called latent images and whose shape corresponds to that of the characters to be printed. The magnetized areas of the drum then pass in front of the application device 5 which is arranged below the drum 2 and which makes it possible to apply to the surface of the drum particles of a pulverulent pigment P contained in a reservoir 6. In the he example described, this pigment consists of magnetic particles coated with a resin which, by heating, is capable of melting and fixing on a paper on which it has been deposited. It should however be pointed out that the nature of this pigment is not specific to the invention and that, in the case of an electrostatic printer to which of course the invention applies, this pigment could very well consist of a known powder containing no magnetic particles.

Le pigment adhère principalement sur les domaines magnétisés 4, formant ainsi des dépôts 7 de particules (figure 2) à la surface du tambour 2. Des moyens de retouche consistant en un ' cylindre magnétique rotatif 8 disposé au voisinage du tambour 2 sont ensuite prévus pour éliminer les particules ayant adhéré ailleurs que sur les domaines magnétisés 4 ainsi que les particules en surnombre sur lesdits domaines. Un petit déflecteur 8b est disposé près du cylindre 8 de retouche pour faire retomber dans le réservoir 6 les particules captées par ce cylindre de retouche. Mais cette retouche 8 crée des chaînes de particules qui se couchent sur le tambour 2 et que l'on cherche à éliminer à l'aide d'une autre retouche par aspiration 9. Après quoi, les particules sont transférées sur une feuille support telle qu'une feuille de papier 10 appliquée contre le tambour grâce à un rouleau de transfert 11. Enfin, les particules qui subsistent sur le tambour sont enlevées dans un poste de nettoyage 12 puis les points magnétiques sont effacés par un module d'effacement 13, à la suite de quoi un nouveau cycle d'impression peut avoir lieu.The pigment mainly adheres to the magnetized areas 4, thus forming deposits 7 of particles (FIG. 2) on the surface of the drum 2. Touch-up means consisting of a rotating magnetic cylinder 8 disposed in the vicinity of the drum 2 are then provided for eliminate the particles having adhered elsewhere than on the magnetized domains 4 as well as the particles in excess on said domains. A small deflector 8b is arranged near the cylinder 8 retouching to cause the particles captured by this retouching cylinder to fall back into the tank 6. But this retouching 8 creates chains of particles which lie on the drum 2 and which one seeks to eliminate by means of another retouching by suction 9. After which, the particles are transferred to a support sheet such that 'a sheet of paper 10 applied against the drum by means of a transfer roller 11. Finally, the particles which remain on the drum are removed in a cleaning station 12 then the magnetic points are erased by an erasing module 13, at after which a new printing cycle can take place.

Ainsi qu'on peut le voir sur la figure 1, le dispositif d'application 5 comprend, d'une part un élément de transport 14, qui prélève des particules de pigment se trouvant dans le réservoir 6, lorsque le niveau des particules est suffisamment élevé dans ce réservoir, pour les amener au voisinage de la surface du tambour 2, d'autre part, un déflecteur fixe 15 qui est interposé entre l'élément de transport 14 et le tambour 2 pour recueillir les particules transportées par cet élément 14 et les appliquer sur la surface du tambour 2.As can be seen in FIG. 1, the application device 5 comprises, on the one hand, a transport element 14, which removes particles of pigment from the reservoir 6, when the level of the particles is sufficient raised in this tank, to bring them near the surface of the drum 2, on the other hand, a fixed deflector 15 which is interposed between the transport element 14 and the drum 2 to collect the particles transported by this element 14 and apply them to the surface of the drum 2.

L'élément de transport 14 consiste par exemple en un cylindre magnétique dont l'axe de rotation A2 est parallèle à l'axe A, du tambour 2 et peut tourner dans deux paliers non représentés, dont sont respectivement munies les faces latérales du réservoir 6. Seule la face latérale arrière 16 est représentée sur la figure 1, la face latérale avant, située en avant de la figure 1, n'étant pas représentée.The transport element 14 consists for example of a magnetic cylinder whose axis of rotation A 2 is parallel to the axis A, of the drum 2 and can rotate in two bearings not shown, which are respectively provided with the side faces of the reservoir 6. Only the rear side face 16 is shown in Figure 1, the front side face, located in front of Figure 1, not being shown.

Le déflecteur 15, représenté sur la figure 2, est une pièce fixée aux deux faces latérales du réservoir 6 et présentant une face plane 17 limitée par un premier et un second bords 18 et 19 parallèles aux axes A, et A2, le second bord 19 formant de préférérence une arête vive pour éviter une accumulation de particules sur ledit bord. Le déflecteur 15 est disposé de façon que sa face 17 forme avec le plan défini par l'axe A, du tambour et l'axe A2 de l'élément, un dièdre dont l'arête soit formée par le premier bord 18 et soit proche de l'élément de transport 14 et dont l'angle soit inférieur à 45 degrés. Par ailleurs, ce déflecteur 15 est prévu pour que l'arête vive 19 soit au voisinage du tambour 2. A titre d'exemple, le déflecteur 15 est constitué par une tige hémi-cylindrique disposée de façon que ladite face plane 17 (c'est-à-dire le plan diamétral définissant cette tige) contienne les axes A, et A2.The deflector 15, shown in FIG. 2, is a part fixed to the two lateral faces of the tank 6 and having a planar face 17 limited by a first and a second edge 18 and 19 parallel to the axes A, and A 2 , the second edge 19 preferably forming a sharp edge to avoid an accumulation of particles on said edge. The deflector 15 is arranged so that its face 17 forms, with the plane defined by the axis A, of the drum and the axis A 2 of the element, a dihedral whose edge is formed by the first edge 18 and is close to the transport element 14 and whose angle is less than 45 degrees. Furthermore, this deflector 15 is provided so that the sharp edge 19 is in the vicinity of the drum 2. By way of example, the deflector 15 is constituted by a semi-cylindrical rod arranged so that said flat face 17 (c ' i.e. the diametral plane defining this rod) contains the axes A, and A 2 .

L'elément de transport 14 a un sens de rotation, indiqué par la flèche F2 sur la figure 2, prévu pour entraîner les particules vers cette face 17. L'espace compris entre l'élément de transport et le premier bord 18 du déflecteur est choisi suffisamment faible pour que les particules soient pour la plupart arrêtées au passage par le déflecteur 15 et viennent alors s'accumuler dans un auget 20 délimité par la surface de l'élément de transport 14 et par la face 17 du déflecteur 15. Le sens de rotation du tambour 2, indiqué par la flèche F, sur la figure 2, est choisi pour que les particules accumulées dans l'auget 20 soient entraînées vers l'arête vive 19 du déflecteur 15, de façon qu'une partie d'entre elles puisse venir s'appliquer sur les zones magnétisées du tambour 2. Toutefois, les particules ainsi entraînées par le tambour 2 ne sont pas arrêtées au passage par le déflecteur 15, du fait que celui-ci ne touche pas la surface du tambour et qu'il laisse par conséquent, entre l'arête vive 19 et le tambour, une ouverture dont la largeur est suffisante pour permettre aux particules de pigment entraînées par le tambour de sortir de l'auget 20. Les particules de pigment qui, appliquées sur les zones magnétisées du tambour, sortent de l'auget 20, continuent à adhérer à ces zones et rendent ainsi visibles les caractères qui doivent être imprimés tandis que celles qui sortent de l'auget 20 sans être retenues par le tambour retombent généralement dans le réservoir 6.The transport element 14 has a direction of rotation, indicated by the arrow F 2 in FIG. 2, intended to drive the particles towards this face 17. The space between the transport element and the first edge 18 of the deflector is chosen low enough so that the particles are mostly stopped in passing by the deflector 15 and then accumulate in a trough 20 delimited by the surface of the transport element 14 and by the face 17 of the deflector 15. The direction of rotation of the drum 2, indicated by the arrow F, in FIG. 2, is chosen so that the particles accumulated in the bucket 20 are entrained towards the sharp edge 19 of the deflector 15, so that part of between them can be applied to the magnetized areas of the drum 2. However, the particles thus entrained by the drum 2 are not stopped in passing by the deflector 15, owing to the fact that the latter does not touch the surface of the drum and which it therefore leaves, between the edge v ive 19 and the drum, an opening whose width is sufficient to allow the pigment particles entrained by the drum to exit from the bucket 20. The pigment particles which, applied to the magnetized zones of the drum, exit from the bucket 20, continue to adhere to these zones and thus make visible the characters which must be printed while those which leave the bucket 20 without being retained by the drum generally fall back into the tank 6.

Selon l'invention, le dispositif d'application 5 (figure 1) comprend en outre, d'une part un organe 21 de transport qui prélève des particules de pigment se trouvant dans le réservoir 6 pour les amener au voisinage- de la surface de l'élément 14 de transport, d'autre part, un autre déflecteur 22 qui est interposé entre l'organe 21 de transport et l'élément 14 de transport pour recueillir les particules transportées par l'organe 21 de transport et les transférer à la surface de l'élément 14 de transport. Ledit organe 21 de transport est disposé dans le réservoir 6, en dessous de l'élément 14 de transport et consiste en un cylindre qui est magnétique dans l'exemple décrit et dont l'axe A3 de rotation est parallèle aux axes A, et A2 précédemment définis et peut tourner dans deux paliers non représentés, dont sont munies les faces latérales du réservoir 6.According to the invention, the application device 5 (FIG. 1) further comprises, on the one hand, a transport member 21 which removes particles of pigment from the reservoir 6 to bring them in the vicinity of the surface of the transport element 14, on the other hand, another deflector 22 which is interposed between the transport member 21 and the transport element 14 to collect the particles transported by the transport member 21 and transfer them to the surface of the transport element 14. Said transport member 21 is disposed in the reservoir 6, below the transport element 14 and consists of a cylinder which is magnetic in the example described and whose axis A 3 of rotation is parallel to the axes A, and A 2 previously defined and can rotate in two bearings not shown, which are provided with the lateral faces of the reservoir 6.

L'autre déflecteur 22, représenté sur la figure 2, est une pièce fixée aux deux faces latérales. du réservoir 6 et présentant une face plane 23 limitée par un premier et un second bords 24 et 25 parallèles à l'axe A2 de l'élément 14 de transport et à l'axe A3 de l'organe 21 de transport. L'autre déflecteur 22 est disposé de façon que sa face plane 23 forme avec le plan défini par les axes A2 et A3, un dièdre dont l'arête soit formée par le premier bord 24 et soit proche de l'organe 21 de transport et dont l'angle soit inférieur à 45 degrés. Par ailleurs, l'autre déflecteur 22 est prévu pour que son second bord 25 soit au voisinage de l'élément 14 de transport. A titre d'exemple, l'autre déflecteur 22 est constitué par une tige hémi-cylindrique disposée de façon que sa face plane 23 (c'est-à-dire le plan diamétral définissant cette tige) contienne les axes A2 et A3' The other deflector 22, shown in FIG. 2, is a part fixed to the two lateral faces. of the reservoir 6 and having a flat face 23 limited by a first and a second edge 24 and 25 parallel to the axis A 2 of the transport element 14 and to the axis A 3 of the transport member 21. The other deflector 22 is arranged so that its planar face 23 forms, with the plane defined by the axes A 2 and A 3 , a dihedral whose edge is formed by the first edge 24 and is close to the member 21 of transport and whose angle is less than 45 degrees. Furthermore, the other deflector 22 is provided so that its second edge 25 is in the vicinity of the transport element 14. By way of example, the other deflector 22 is constituted by a semi-cylindrical rod arranged so that its flat face 23 (that is to say the diametral plane defining this rod) contains the axes A 2 and A 3 ''

L'organe 21 de transport a un sens de rotation indiqué par une flèche F3 sur la figure 2 et prévu, en fonction du sens de rotation de l'élément 14 de transport, pour entraîner les particules vers la face plane 23 du déflecteur 22, particules qui sont ensuite entraînées vers l'élément 14 de transport. En d'autres termes, les sens de rotation sont tels qu'il se crée un mouvement ascendant des particules de pigment. Dans l'exemple représenté sur la figure 2, les faces places 17 et 23 sont tournées vers la gauche, l'organe 21 et l'élément 14 de transport tournent dans le sens des aiguilles d'une montre et le tambour 2, en sens inverse. On voit ainsi que les rôles joués par l'association de l'organe 21 de transport, de l'autre déflecteur 22 et de l'élément 14 de transport, association de laquelle résulte un éloignement des particules du second bord 25 de l'autre déflecteur 22, et par l'association de l'élément 14 de transport, du déflecteur 15 et du tambour 2, association de laquelle résulte, au contraire, un rapprochement des particules de l'arête 19 du déflecteur 15, sont différents.The transport member 21 has a direction of rotation indicated by an arrow F 3 in FIG. 2 and provided, as a function of the direction of rotation of the transport element 14, for driving the particles towards the flat face 23 of the deflector 22 , particles which are then entrained towards the transport element 14. In other words, the directions of rotation are such that an upward movement of parties is created. pigment cules. In the example shown in Figure 2, the seating faces 17 and 23 are turned to the left, the member 21 and the transport element 14 rotate clockwise and the drum 2, in the direction reverse. It can thus be seen that the roles played by the association of the transport member 21, of the other deflector 22 and of the transport element 14, association which results in a separation of the particles from the second edge 25 from the other deflector 22, and by the association of the transport element 14, of the deflector 15 and of the drum 2, association of which results, on the contrary, a bringing together of the particles of the edge 19 of the deflector 15, are different.

On a ainsi une alimentation du tambour 2 en particules tant que, dans le réservoir 6, le niveau des particules n'atteint pas le bas de l'organe 21 de transport, repéré par un trait mixte 33a indiquant donc un niveau minimum. Lorsque le niveau des particules a baissé de façon à atteindre le haut de l'organe 21 de transport, les particules sont toujours entraînées vers l'autre déflecteur 22 mais s'accumulent alors dans un autre auget 26 délimité par la surface de l'organe 21 de transport et par la face plane 23 de l'autre déflecteur 22, avant d'être entraînées par l'élément 14 de transport. L'espace existant entre le premier bord 24 de l'autre déflecteur 22 et l'organe 21 de transport est choisi suffisamment faible pour que les particules soient pour la plupart arrêtées au passage par l'autre déflecteur 22.There is thus a supply of the drum 2 with particles as long as, in the tank 6, the level of the particles does not reach the bottom of the transport member 21, identified by a dashed line 33a therefore indicating a minimum level. When the level of the particles has dropped so as to reach the top of the transport member 21, the particles are always entrained towards the other deflector 22 but then accumulate in another trough 26 delimited by the surface of the member 21 transport and by the flat face 23 of the other deflector 22, before being driven by the transport element 14. The space existing between the first edge 24 of the other deflector 22 and the transport member 21 is chosen to be sufficiently small so that the particles are mostly stopped in passing by the other deflector 22.

En ce qui concerne les rôles respectifs joués par les déflecteurs 15 et 22, il faut signaler que le déflecteur 15, qui est interposé entre le tambour magnétique 2 et l'élément 14 de transport, a essentiellement pour but d'assurer une bonne application de particules de pigment sur ce tambour 2, tout en évitant que les domaines magnétisés 4 qui ont été formés sur ce tambour se trouvent fortement altérés au moment où, passant devant l'élément 14 de transport, ils sont soumis à l'action des flux magnétiques de dispersion engendrés par cet élément 14. Au contraire, l'autre déflecteur 22, qui est interposé entre l'élément 14 de transport et l'organe 21 de transport, a essentiellement pour but, lorsque le niveau des particules dans le réservoir 6 devient inférieur à celui du haut de l'organe 21, d'assurer une réserve consommable de particules qui permet d'alimenter régulièrement en particules l'élément 14 de transport et procure une bonne répartition des particules sur la surface de cet élément même si, par suite de légères variations de la vitesse d'entraînement de l'organe 21 de transport par exemple l'arrivée des particules dans cette réserve devient irrégulière.With regard to the respective roles played by the deflectors 15 and 22, it should be noted that the deflector 15, which is interposed between the magnetic drum 2 and the transport element 14, is essentially intended to ensure proper application of pigment particles on this drum 2, while preventing the magnetized domains 4 which have been formed on this drum from being greatly altered at the moment when, passing in front of the transport element 14, they are subjected to the action of magnetic fluxes of dispersion generated by this element 14. On the contrary, the other deflector 22, which is interposed between the transport element 14 and the transport member 21, has essentially the purpose, when the level of particles in the tank 6 becomes lower than that of the top of the member 21, to ensure a consumable reserve of particles which makes it possible to regularly supply particles with the transport element 14 and provides a good distribution of the particles on the surface of this element Even if, as a result of slight variations in the driving speed of the transport member 21, for example, the arrival of the particles in this reserve becomes irregular.

Pour améliorer encore la continuité et la régularité de l'alimentation de l'élément 14 de transport (figure 1) en particules, on ajoute dans le réservoir 6 un moyen 27 de brassage du pigment pulvérulent. Ce moyen 27 de brassage a un axe de rotation A4 parallèle à celui de l'organe 21 de transport et porté par deux paliers non représentés, placés sur les faces latérales du réservoir 6. Dans ce dernier, ledit moyen 27 de brassage est par exemple placé au même niveau que l'organe 21 de transport. On peut d'ailleurs placer cet organe 21 de transport au fond du réservoir 6, pour que le maximum de particules dudit réservoir soit consommé.To further improve the continuity and regularity of the supply of the transport element 14 (FIG. 1) with particles, a means 27 for mixing the pulverulent pigment is added to the reservoir 6. This mixing means 27 has an axis of rotation A 4 parallel to that of the transport member 21 and carried by two bearings, not shown, placed on the lateral faces of the tank 6. In the latter, said mixing means 27 is by example placed at the same level as the transport member 21. We can also place this transport member 21 at the bottom of the tank 6, so that the maximum of particles of said tank is consumed.

Un mode de réalisation particulier du moyen 27 de brassage est représenté schématiquement et en partie sur la figure 4. Il comporte essentiellement l'axe A4 de rotation et deux tiges 27a et 27b épousant la forme de créneaux, rendues solidaires dudit axe et disposées perpendiculairement l'une à l'autre. La rotation du moyen 27 de brassage est par exemple prévue pour s'éffectuer dans un sens, indiqué par la flèche F, sur la figure 1, identique à celui de la rotation de l'organe 21 de transport.A particular embodiment of the stirring means 27 is shown diagrammatically and in part in FIG. 4. It essentially comprises the axis A 4 of rotation and two rods 27a and 27b taking the form of slots, made integral with said axis and arranged perpendicularly to each other. The rotation of the stirring means 27 is for example intended to take place in a direction, indicated by the arrow F, in FIG. 1, identical to that of the rotation of the transport member 21.

On peut encore augmenter la capacité du réservoir 6 en augmentant sa profondeur, ce que l'on a représenté par des traits mixtes 6a sur la figure 1, et en disposant dans ce réservoir un autre organe 28 de transport, constitué par un cylindre magnétique et placé au-dessous dudit organe 21 de transport. L'axe de rotation As de cet autre organe 28 est parallèle à l'axe A3 et porté par deux paliers, non représentés, placés dans les faces latérales du réservoir 6. Un troisième déflecteur 29 est interposé entre ledit organe 21 et ledit autre organe 28 de transport. Cet autre organe 28 alimente ainsi l'organe 21 de transport en particules, par l'intermédiaire du troisième déflecteur 29. Ce troisième déflecteur 29 est fixé aux faces latérales du réservoir 6, est par exemple constitué comme l'autre déflecteur 22, présente ainsi une face plane 30 et est disposé, entre l'autre organe 28 et l'organe 21 de transport, comme est disposé l'autre déflecteur < 22, entre cet organe 21 de transport et l'élément 14 de transport. Le sens de rotation dudit autre organe 28, représenté par une flèche Fs sur la figure 1, est alors choisi identique à celui dudit organe 21 de transport. Qn peut disposer l'élément 14, l'organe 21 et l'autre organe 28 de transport de façon que leurs axes de rotation respectifs soient dans un même plan et disposer l'autre déflecteur 22 et le troisième déflecteur 29 de façon qu'ils aient leurs faces planes respectives 23 (figure 2) et 30 (figure 1) dans ledit plan. On peut également ajouter un autre moyen 31 de brassage dans le réservoir 6, au niveau de l'autre organe 28 de transport.The capacity of the reservoir 6 can be further increased by increasing its depth, which is shown by dashed lines 6a in FIG. 1, and by placing in this reservoir another transport member 28, constituted by a magnetic cylinder and placed below said transport member 21. The axis of rotation A s of this other member 28 is parallel to the axis A 3 and carried by two bearings, not shown, placed in the lateral faces of the tank 6. A third deflector 29 is interposed between said member 21 and said other transport member 28. This other member 28 thus feeds the transport member 21 with particles, via the third deflector 29. This third deflector 29 is fixed to the lateral faces of the tank 6, is for example constituted like the other deflector 22, thus presents a flat face 30 and is disposed, between the other member 28 and the transport member 21, as is arranged the other deflector <22, between this transport member 21 and the transport element 14. The direction of rotation of said other member 28, represented by an arrow F s in FIG. 1, is then chosen identical to that of said transport member 21. Qn can arrange the element 14, the member 21 and the other transport member 28 so that their respective axes of rotation are in the same plane and arrange the other deflector 22 and the third deflector 29 so that they have their respective flat faces 23 (Figure 2) and 30 (Figure 1) in said plane. Another means 31 of stirring can also be added in the reservoir 6, at the level of the other transport member 28.

Dans le réservoir 6, les particules peuvent alors passer d'un niveau 32 maximum à un niveau 33 minimum correspondant au bas de l'autre organe 28 de transport. Au départ, ce dernier n'intervient pas mais il contribue à l'alimentation du tambour 2 en particules lorsque le niveau de ces particules a suffisamment baissé pour être à la hauteur de cet autre organe 28.In the tank 6, the particles can then pass from a maximum level 32 to a minimum level 33 corresponding to the bottom of the other transport member 28. At the start, the latter does not intervene, but it contributes to supplying the drum 2 with particles when the level of these particles has dropped sufficiently to be at the level of this other member 28.

On dispose ainsi d'une réserve consommable de particules dans le réservoir 6 lui-même, ce qui est plus avantageux qu'une réserve latérale extérieure, associée à un système d'alimentation à bande sans fin magnétisée ou avec des godets, système difficile à maîtriser et nécessitant un grand couple d'entraînement et une bonne étanchéité afin d'éviter que de l'encre, ou pigment, s'interpose entre les cylindres d'entraînement et la bande.There is thus a consumable reserve of particles in the tank 6 itself, which is more advantageous than an external lateral reserve, associated with a feed system with an endless magnetized belt or with buckets, a system which is difficult to master and requiring a great deal of drive and good prop chewiness to prevent ink, or pigment, from interposing between the drive rolls and the tape.

Bien entendu, on pourrait prévoir un capteur de niveau pour indiquer aux utilisateurs de l'imprimante l'instant où le niveau 33 minimum est atteint.Of course, a level sensor could be provided to indicate to the users of the printer when the minimum level 33 is reached.

Sur la figure 3, on a représenté schématiquement un mode de réalisation particulier de l'organe 21 de transport. Il comporte un cylindre 21a d'axe A3, revêtu d'une bande 21b qui est magnétisée en permanence et qui est formée, dans l'exemple décrit, par du caoutchouc dans lequel sont incorporées des particules métalliques magnétisées en permanence. La figure 3 montre que cette bande 21b a a été magnétisée de manière à présenter sur sa face externe 21c des zones aimantées successives 21 dont la polarité est telle que deux zones d'aimantation consécutives quelconques ont des polarités magnétiques opposées. Autrement dit, la polarité de ces zones aimantées successives est alternativement nord et sud, les pôles nord et sud étant désignés, sur la figure 3, respectivement par les lettres N et S. Dans ces conditions, une partie des particules de pigment se trouvant dans le réservoir 6 (figure 1) est attirée par la bande 21b. Il faut cependant signaler que le mode d'aimantation de la bande 21 b qui vient d'être décrit n'est pas exclusif de l'invention et l'on pourrait utiliser tout autre mode de magnétisation permettant à la bande 21b d'attirer les particules de pigment. On peut réaliser de la même façon l'autre organe 28 de transport et l'élément 14 de transport.In Figure 3, there is shown schematically a particular embodiment of the transport member 21. It comprises a cylinder 21a of axis A 3 , coated with a strip 21b which is permanently magnetized and which is formed, in the example described, by rubber in which metallic particles are permanently magnetized. FIG. 3 shows that this strip 21b has been magnetized so as to present on its external face 21c successive magnetized zones 21 whose polarity is such that any two consecutive magnetization zones have opposite magnetic polarities. In other words, the polarity of these successive magnetized zones is alternately north and south, the north and south poles being designated, in FIG. 3, respectively by the letters N and S. Under these conditions, part of the pigment particles found in the reservoir 6 (Figure 1) is attracted by the strip 21b. It should however be noted that the mode of magnetization of the strip 21b which has just been described is not exclusive of the invention and one could use any other mode of magnetization allowing the strip 21b to attract the pigment particles. The other transport member 28 and the transport element 14 can be produced in the same way.

Sur la figure 1, on voit également le couvercle coulissant 34 du réservoir 6, ce couvercle étant arrêté par une butée 35 pour ne pas endom- manger le tambour 2. On voit également, de façon schématique, une partie des pignons permettant la rotation des moyens 8 de retouche (pignon 8a), de l'élément 14 de transport (pignon 14a), de l'organe 21 de transport (pignon 21a) et du moyen 27 de battage (pignon 27c). On n'a pas représenté le pignon permettant la rotation de l'autre organe 28 de transport, ni celui qui permet la rotation de l'autre moyen 31 de battage. On a également représenté quelques uns des pignons intermédiaires 36 nécessaires pour obtenir des sens de rotation convenables ainsi que le pignon moteur 37 entraîné par un moteur non représenté et permettant l'entraînement de tous les autres pignons. Cet ensemble de pignons est réalisable par l'homme de l'art et disposé à l'extérieur du réservoir 6, par exemple de l'autre côté de la face externe 16 sur la figure 1.In FIG. 1, the sliding cover 34 of the reservoir 6 is also seen, this cover being stopped by a stop 35 so as not to damage the drum 2. We also see, diagrammatically, a part of the pinions allowing the rotation of the retouching means 8 (pinion 8a), of the transport element 14 (pinion 14a), of the transport member 21 (pinion 21a) and of the threshing means 27 (pinion 27c). The pinion allowing the rotation of the other transport member 28, nor that which allows the rotation of the other threshing means 31 has not been shown. Also shown are some of the intermediate pinions 36 necessary to obtain suitable directions of rotation as well as the motor pinion 37 driven by a motor not shown and allowing the drive of all the other pinions. This set of pinions can be produced by a person skilled in the art and placed outside the tank 6, for example on the other side of the external face 16 in FIG. 1.

A titre indicatif mais non limtatif, le déflecteur 22 et l'autre déflecteur 29 sont faits d'un matériau magnétique, les distances D1, D2, D3, D4 (figure 2) respectivement entre le tambour 2 et le déflecteur 15, entre ce dernier et l'élément 14 de transport, entre ce dernier et l'autre déflecteur 22, entre ce dernier et l'autre organe 21 de transport, sont respectivement égales à 1 mm, 0,5 mm, 5 mm, 0,5 mm, les largeurs respectives L1 et L2 des faces 17 et 23 sont de l'ordre de 1 cm et les vitesses de rotation respectives de l'élément 14 de transport et de l'organe 21 de transport sont respectivement de l'ordre de 50 tours par minute et 30 tours par minute. On remarquera de plus, sur la figure 1, que, du fait des faibles espaces existant de part et d'autre des déflecteurs 22 et 29, ces déflecteurs forment avec l'élément 14, l'organe 21 et l'autre organe 28 de transport une sorte de mur permettant au pigment P d'être en grande partie confiné d'un côté dudit mur (à gauche sur la figure 1), pour ne pas gêner notamment le cylindre 8 de retouche.As an indication but not limiting, the deflector 22 and the other deflector 29 are made of a magnetic material, the distances D1, D2, D3, D4 (Figure 2) respectively between the drum 2 and the deflector 15, between the latter and the transport element 14, between the latter and the other deflector 22, between the latter and the other transport member 21, are respectively equal to 1 mm, 0.5 mm, 5 mm, 0.5 mm, the respective widths L1 and L2 of the faces 17 and 23 are of the order of 1 cm and the respective rotational speeds of the transport element 14 and of the transport member 21 are respectively of the order of 50 revolutions per minute and 30 revolutions per minute. It will also be noted, in FIG. 1, that, due to the small spaces existing on either side of the deflectors 22 and 29, these deflectors form with the element 14, the member 21 and the other member 28 of transport a sort of wall allowing the pigment P to be largely confined to one side of said wall (on the left in FIG. 1), so as not to hinder in particular the cylinder 8 for retouching.

Claims (5)

1. A device for the application on to the record carrier (2) of a non-impact printer, of solid particles of a pulverulent pigment contained in a reservoir (6) situated below this carrier, said device comprising a transport element (14) arranged to deliver these particles close to the surface of said carrier (2) and a deflector (15) interpositioned between this carrier (2) and the transport element (14) for collection of the particles transported by this element, said deflector (15) having one of its edges (19) positioned in the immediate proximity of the said carrier so as to form with this carrier a trough (20) of substantially prismatic shape, wherein are accumulated the particles thus collected, said carrier (2) being displaced in the direction (F,) such that it entrains these particles towards the edge of the said prism, the particles entrained beyond this edge remaining applied only to the sensitised areas (4) of the said record carrier (2), the said applicator device being characterised in that it also comprises a transport member (21) of cylindrical form, situated below the transport element (14) and so arranged that by rotation around its axis (A3) it delivers particles close to said transport element (14), as well as another deflector (22) interposed between said transport member (21) and said transport element (14) in such a manner as to have available a reserve of particles when the level of the particles in the container (6) drops lower than the upper level of the transport member (21).
2. Applicator device according to claim 1, characterised in that it also comprises a means (27) for stirring the particles within the container (6).
3. Applicator device according to either of claims 1 and 2, characterised in that it also comprises at least one other transport member (28) of cylindrical shape, arranged so that by rotation around its axis (A5) it feeds particles to the said transport member (21) via a deflector (29) interpositioned between the said member (21) and the said other transport member (28), in such a manner as to have a reserve of particles available in the container (6) itself.
4. Applicator device according to any one of claims 1 to 3, characterised in that the said other deflector (22) extends over a length of the order of one centimeter, between the said transport element (14) and the said transport member (21) and between itself and the transport member (21) leaves a gap equal to at most one millimeter and between itself and the said transport element (14), a gap of the order of 5 mms.
5. Applicator device according to any one of claims 1 to 4, characterised in that the solid particles being able to be attracted by a magnet, the said transport member (21) and the said transport element (14) are magnetic at the surface.
EP83400099A 1982-02-11 1983-01-14 Device for the application of solid particles on the recording support of a printing machine Expired EP0086683B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8202205 1982-02-11
FR8202205A FR2521069A2 (en) 1982-02-11 1982-02-11 DEVICE FOR APPLYING SOLID PARTICLES ON THE RECORDING MEDIUM OF A NON-IMPACT PRINTER

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EP0086683A1 EP0086683A1 (en) 1983-08-24
EP0086683B1 true EP0086683B1 (en) 1986-04-09

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US (1) US4430957A (en)
EP (1) EP0086683B1 (en)
JP (1) JPS58171067A (en)
DE (1) DE3362837D1 (en)
FR (1) FR2521069A2 (en)

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US4814820A (en) * 1985-06-29 1989-03-21 Minolta Camera Kabushiki Kaisha Electrostatic latent image developing apparatus
DE3632474A1 (en) * 1986-09-24 1988-03-31 Siemens Ag NON-MECHANICAL PRINT OR COPIER WITH AN EXPOSURE DEVICE ARRANGED IN THE DEVELOPMENT AREA
DE3632441A1 (en) * 1986-09-24 1988-03-31 Siemens Ag SIMULTANEOUS COUNTERFLOW DEVELOPER STATION FOR AN ELECTROPHOTOGRAPHIC DEVICE
FR2639726B1 (en) * 1988-11-29 1991-01-11 Bull Sa DEVICE FOR THE REINTRODUCTION, INTO A TANK OPEN TO AIR, OF SOLID DEVELOPER PARTICLES WHICH HAVE BEEN SEPARATED FROM A CARRIER GAS STREAM
FR2646250B1 (en) * 1989-04-20 1992-01-03 Bull Sa DEVICE FOR APPLYING, ON THE RECORDING MEDIUM OF A NON-IMPACT PRINTER, PARTICLES OF A POWDERY DEVELOPER CONTAINED IN A TANK
DE4035745A1 (en) * 1989-11-10 1991-05-29 Asahi Optical Co Ltd Toner mixer arm
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FR2737023B1 (en) * 1995-07-19 1997-08-22 Nipson DEVICE FOR INKING A DEVELOPING DRUM

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JPS5723547U (en) * 1980-07-10 1982-02-06
JPS5821159U (en) * 1981-07-31 1983-02-09 株式会社リコー Electronic copying machine developing device

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Publication number Publication date
JPS58171067A (en) 1983-10-07
FR2521069A2 (en) 1983-08-12
US4430957A (en) 1984-02-14
FR2521069B2 (en) 1984-03-23
EP0086683A1 (en) 1983-08-24
JPH0572585B2 (en) 1993-10-12
DE3362837D1 (en) 1986-05-15

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