EP0371828A1 - Vorrichtung zum Trennen und Zurückgewinnen von durch eine Gasströmung transportierten festen Entwicklerteilchen - Google Patents

Vorrichtung zum Trennen und Zurückgewinnen von durch eine Gasströmung transportierten festen Entwicklerteilchen Download PDF

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Publication number
EP0371828A1
EP0371828A1 EP19890402619 EP89402619A EP0371828A1 EP 0371828 A1 EP0371828 A1 EP 0371828A1 EP 19890402619 EP19890402619 EP 19890402619 EP 89402619 A EP89402619 A EP 89402619A EP 0371828 A1 EP0371828 A1 EP 0371828A1
Authority
EP
European Patent Office
Prior art keywords
particles
chamber
duct
gas flow
helical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19890402619
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English (en)
French (fr)
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EP0371828B1 (de
Inventor
André Brecy
Philippe Poinsot
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 SAS
Original Assignee
Bull SAS
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 SAS filed Critical Bull SAS
Publication of EP0371828A1 publication Critical patent/EP0371828A1/de
Application granted granted Critical
Publication of EP0371828B1 publication Critical patent/EP0371828B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/181—Bulkheads or central bodies in the discharge opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/081—Shapes or dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/10—Collecting or recycling waste developer
    • G03G21/105—Arrangements for conveying toner waste

Definitions

  • the present invention relates to an apparatus for separating and recovering solid developer particles transported by a gas flow.
  • a device finds more particularly, although not exclusively, its application in non-impact printing machines in which developer particles, after having been deposited in excess on the recording medium equipping these machines, are removed from the surface of this support by means of a suction device and collected in a recovery box for recycling.
  • the non-impact printing machines that are used in information processing equipment are now well known. These machines include a recording medium, most often consisting of a rotating 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 print. These latent images are then developed, that is to say made visible, using a powdery developer which, deposited on the recording medium, is only attracted by the sensitized areas thereof, thus forming a powder image on the surface of this support. After which, this recording medium is brought into contact with a sheet of paper in order to allow the developer particles constituting this powder image to be transferred onto this sheet to be definitively fixed there.
  • a recording medium most often consisting of a rotating 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 print.
  • These latent images are then developed, that is to say made visible,
  • retouching devices capable of retouching by magnetic attraction or by blowing air have been produced
  • a retouching device has been produced, which has been described in United States patent No. 3,680,528 and which comprises a suction duct provided, on the one hand with a slot. or nozzle which extends close to the surface of the recording medium, on the other hand of an opening connected, by means of a pipe, to a suction turbine.
  • the air which is sucked in through the slit of the suction duct entrains the excess particles which are found on the parts of the recording medium situated directly above this slit.
  • the air which is thus charged with particles circulates in the pipeline, then, after passing through the turbine, is discharged towards an outlet duct at the end of which has been fixed a recovery bag made of an air permeable material .
  • the air which is forced back by the turbine can thus cross the bag and be rejected in the atmosphere, while the particles of developer which were transported by this air flow are stopped by the meshes of the bag and can thus be recovered for subsequently be replaced in the applicator device.
  • the air which passes through the suction turbine is necessarily loaded with developer particles, there is, in the long run, fouling of the turbine, which makes maintenance necessary. of this particularly expensive retouching device.
  • the present invention overcomes the drawbacks of the prior art and proposes an apparatus which, when mounted in a pneumatic circuit in which a gas flow carrying solid particles circulates, such as a circuit comprising a touch-up device used in a machine non-impact printer for example, allows to separate and recover practically all the particles of this gas flow.
  • the apparatus of the present invention includes a device similar to those which, designated by the name of cyclones, are usually used to purify an air flow laden with solid particles, before discharging this air into the atmosphere.
  • 1,096,003 and 1,130,411 each include , in general, a separation chamber provided at its upper part with an intake duct through which the air charged with particles arrives in the chamber and an exhaust duct through which the air who has been freed of his particles leaves this room.
  • This chamber is further provided, at its lower part, with an outlet orifice which communicates with a discharge conduit, of short length, opening into the open air, which allows the particles which have separated from the flow of air in the chamber and which are urged by gravity towards this discharge conduit, to leave the chamber by this conduit to fall into an unsealed container disposed below the discharge conduit.
  • the present invention relates more specifically to an apparatus for separating and recovering solid developer particles transported by a gas flow, this apparatus being characterized in that that he understands: - A separation chamber having an axis of revolution arranged practically vertically, this chamber being provided at its upper part, on the one hand with an intake duct arranged so as to create a vortex flow for a gas flow which, charged with solid developer particles, arrives in this chamber via this intake duct, on the other hand an exhaust duct arranged axially and extending inside this chamber to allow the evacuation of the gas flow which has been freed of its particles, this chamber being further provided, at its lower part, with an outlet orifice communicating with a discharge conduit closed at its lower end by a movable flap to form a particle recovery box, the particles of developer being, after having separated from said gas flow in this chamber, subjected to gravity by said pure discharge conduit finally falling into this box, - And a helical member disposed in said discharge conduit
  • the printing machine which has been shown diagrammatically in FIG. 1 comprises a recording medium which is constituted, in the example described, by a magnetic drum 10.
  • This drum is mounted so as to be able to rotate around a horizontal axis 11
  • the rotation of this drum in the direction indicated by the arrow F, is ensured by an electric motor (not shown).
  • the recording of information on this drum is carried out by a magnetic recording member 12 comprising several heads arranged one next to the other and aligned parallel to the axis of rotation 11 of the drum.
  • Each of these heads generates, each time it is excited for a short time by an electric current, a variable magnetic field, which has the effect of creating magnetized zones 13, practically punctual, on the surface of the drum which passes in front the recording member 12, all of these areas constituting a latent magnetic image corresponding to an image to be printed.
  • These magnetized zones 13 then pass in front of an application device 14 which is arranged practically 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 15.
  • this developer consists of resin particles containing magnetic particles, these resin particles having a size of the order of twenty microns, this resin being capable of melting, when it is subjected to thermal radiation, and thus to be fixed on a paper on which it was deposited. It should however be noted that the nature of this developer is not specific to the invention and that, in the case of an electrostatic printer to which of course the invention applies, this developer could very well consist of a powder containing no magnetic particles.
  • any conventional application device can be used for applying the developer to the drum 10.
  • the application device 14 which is shown in FIG. 1 is of the type which has been described and shown in the aforementioned United States patent No. 4,246. 588.
  • the developer which adheres mainly to the magnetized zones 13, therefore forms deposits 16 of particles on the surface of the drum 10. These deposits 16 then pass in front of a retouching device 17 which has the role of removing the particles which have adhered elsewhere than 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 carried out, 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 portions of the drum 10 which have thus been demagnetized to be able to be magnetized again when they then appear before the recording organ 11.
  • the retouching device 17 which has been shown in FIG. 1 is of the type which has been incidentally described in the patent of the United States of America No. 4,233,382. Without going into all the details of the constitution of this device, it will be indicated that the retouching device which is represented in FIG. 1 comprises a nozzle or suction duct 22 having practically the shape of a straight prism and having, at the one of its ends, an air intake slot 23 which extends, near the surface of the drum 10, in a direction parallel to the axis of rotation 11 of this drum.
  • This suction duct 22 communicates, at its other end, with a chamber 24, of cylindrical shape, arranged in such a way that the generators of this chamber extend parallel to the direction of elongation of the intake slot of air 23.
  • This chamber is provided with a suction opening provided with a pipe 25, the latter allowing this chamber 24 to be connected to an apparatus for separating and recovering particles 26 which will be discussed later.
  • This device 26 is itself connected, by means of another pipe 27 provided with a filtering element 28, to a suction turbine 29. It is then understood that, when this turbine 29 is started, a vacuum is created inside the pneumatic device constituted by the retouching device 17, the pipe 25, the separation and recovery device 26, the pipe 27, the filter element 28 and the turbine 29. Consequently , the developer particles which have been deposited in excess on the surface of the drum 10 are entrained, when they pass in front of the slot 23 of the suction duct 22, by the air which is sucked in through this slot.
  • This air which is thus charged with developer particles, then forms an air flow which circulates successively in the suction duct 22, the chamber 24 and the pipe 25.
  • This air is rid of its particles when it passes through the device 26, then, practically purified when it leaves this device, then circulates in the pipe 27 before passing through the filtering element 28 and being finally discharged into the atmosphere by the turbine 29. Given that, as will be seen below, practically all the particles which have been transported by this air flow are stopped by the device 26, the air which passes through the turbine 29 is not likely to cause fouling of the latter.
  • the apparatus 26 which is shown in FIG. 2 comprises a separation chamber 40 consisting of an upper portion of chamber 41, of cylindrical shape, and of a lower portion of chamber 42, of conical shape.
  • This chamber 40 is provided, at its upper part, on the one hand with an intake duct 43 which is connected to the duct 25 through which the air charged with developer particles arrives, this intake duct being arranged tangentially to the cylindrical wall of the portion 41, so as to create inside the chamber a swirling flow for the air which arrives in this chamber by this duct, on the other hand from an exhaust duct 44, of cylindrical shape, which is arranged along the vertical axis 45 of the chamber 40 and which extends inside the cylindrical portion 41 of this chamber in order to allow the evacuation of the air which has been rid of its particles in this room.
  • This exhaust duct 44 is connected to the pipe 27 connecting the device 26 to the suction turbine 29.
  • the separation chamber 40 is also provided, at its lower part, with an outlet orifice 46 which communicates with a discharge conduit 47, cylindrical in shape.
  • the vortex created by the air flow arriving in the chamber 40 by the intake duct 43 rotates rapidly in a direction which, in FIG. 2, is represented by the arrow 48.
  • the developer particles whose specific mass is greater than that of air, separate from this air flow and form a swirling layer coming to contact the cylindrical wall of the portion 41 of the chamber.
  • these particles are also subjected to a force of gravity, so that, while continuing to spin, they eventually descend into the portion 42 of the chamber and engage in the discharge conduit 47.
  • the discharge conduit 47 is normally closed, at its lower end, by a movable flap 49 which, as shown in FIG.
  • This flap 49 which is actuated in a known manner, manually for example, can occupy two positions, namely a closed position, illustrated in solid lines in FIG. 2, in which it completely closes the lower opening of the discharge conduit 47 and then forms with this conduit a box 51 in which the particles which accumulate have been separated from the air flow, and an open position, illustrated in dashed lines in this figure, in which it allows the particles thus accumulated to exit the discharge conduit 47 to be replaced in the tank 15 of the device application 14 shown in FIG. 1.
  • This reintroduction of the particles can be carried out after these particles have been transported, either manually or using a transport device, from the box 51 to the reservoir 15.
  • the separation and recovery apparatus 26 is arranged just above essus of the tank 15, so that the return, in this tank, of the particles recovered in the box 51 is achieved simply by bringing the flap 49 to the open position when this box is full, which has the effect of causing these particles in this tank.
  • this flap 49 can also be advantageously replaced by a particle reintroduction device which has been described in a patent application filed on the same day by the Applicant.
  • the separation and recovery apparatus 26 also comprises a helical member 52 which is arranged in the discharge conduit 47, near the outlet orifice 46.
  • This member 52 which is formed of a very thin plate, has a surface limited by a helical edge 53 and it is dimensioned so that its helical edge 53 is in contact with the internal wall of the discharge conduit 47.
  • This member 52 is centered along the vertical axis 45 of the chamber 40 and of the duct 47 and it extends all around this axis 45, over a sector whose angle A is substantially equal to 360 °. Under these conditions, the two ends of the helical edge 53 of this member are situated practically one below the other and are spaced apart by a distance p equal to the pitch of the propeller.
  • the direction of the helix of the member 52 is the same as that of the helical path followed by the particles inside the separation chamber 40.
  • the plate constituting this member has an inclination which is oriented in the same direction as that of the helical arrow 48.
  • the helical member 52 does not risk obstructing the developer particles which, after being separated from the air flow in the separation chamber 40 , penetrate through the opening left between the two radial edges of this member to accumulate in the recovery box 51.
  • the pitch p of the propeller of the member 52 is between five millimeters and twelve millimeters.
  • the discharge conduit 47 may have an internal radius between: is : R m ⁇ 4.5 mm and R M ⁇ 15 mm
  • the discharge conduit may have an internal radius between: is : R m ⁇ 9 mm and: R M ⁇ 30 mm
  • a discharge conduit having an interior diameter equal for example to four centimeters will be perfectly suitable.
  • the exhaust duct 44 has an internal diameter whose value is of the same order of magnitude as that of the internal diameter of the discharge duct 47 .
  • the exhaust conduit 44 may have an internal diameter of thirty-five millimeters.
  • the inside diameter of the exhaust pipe is less than that of the discharge pipe and its value does not differ by more than 15% from that of the inside diameter of this latter pipe.
  • the conical part 42 of the separation chamber 40 is produced in such a way that its side wall forms with the axis of revolution 45 of this chamber, that is to say with the vertical, an angle J at most. equal to 15 °. Thanks to this arrangement, practically all of the developer particles which enter this chamber through the intake duct 43 are separated from the air flow which has previously entrained them.
  • the air flow rate of the suction turbine 29 is adjusted by known means (not shown) so that the air pressure inside the separation chamber 40 is maintained at a value fixed p1, which is naturally lower than the p0 value of atmospheric pressure and which is between 760 and 900 hectopascals.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sustainable Development (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Cyclones (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separating Particles In Gases By Inertia (AREA)
EP89402619A 1988-11-29 1989-09-25 Vorrichtung zum Trennen und Zurückgewinnen von durch eine Gasströmung transportierten festen Entwicklerteilchen Expired - Lifetime EP0371828B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8815595 1988-11-29
FR8815595A FR2639559B1 (fr) 1988-11-29 1988-11-29 Appareil pour separer et recuperer des particules solides de revelateur transportees par un flux gazeux

Publications (2)

Publication Number Publication Date
EP0371828A1 true EP0371828A1 (de) 1990-06-06
EP0371828B1 EP0371828B1 (de) 1995-08-30

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Application Number Title Priority Date Filing Date
EP89402619A Expired - Lifetime EP0371828B1 (de) 1988-11-29 1989-09-25 Vorrichtung zum Trennen und Zurückgewinnen von durch eine Gasströmung transportierten festen Entwicklerteilchen

Country Status (7)

Country Link
US (1) US4996538A (de)
EP (1) EP0371828B1 (de)
JP (1) JPH02188781A (de)
AT (1) ATE127039T1 (de)
CA (1) CA1333474C (de)
DE (1) DE68924045T2 (de)
FR (1) FR2639559B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0604029A2 (de) * 1992-12-21 1994-06-29 NCR International, Inc. Farbstrahldruckvorrichtung
WO1997046919A1 (en) * 1996-06-06 1997-12-11 Moore Business Forms, Inc. Non-magnetic toner dynamic recycling
WO2015113779A1 (en) * 2014-01-28 2015-08-06 Koninklijke Philips N.V. Cyclonic separation device

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5280323A (en) * 1991-09-10 1994-01-18 Xerox Corporation Development apparatus employing magnetic field shapers
JPH06110329A (ja) * 1992-04-11 1994-04-22 Ricoh Co Ltd 画像形成装置
GB2293251B (en) * 1992-04-11 1996-08-07 Ricoh Kk Image forming apparatus
US5649271A (en) * 1996-06-27 1997-07-15 Xerox Corporation Air handling system for a development housing
US5754930A (en) * 1996-10-01 1998-05-19 Xerox Corporation Fluidized toner development using a rigid porous donor roll
ES2166674B1 (es) * 1999-09-20 2003-02-16 Rivera Ramon Segura Disposicion para la captacion de bolsas de plastico, aplicable en una planta de tratamiento de residuos urbanos.
KR100437364B1 (ko) 2000-07-26 2004-06-25 삼성광주전자 주식회사 진공청소기의 사이클론 집진장치
KR100398685B1 (ko) 2000-11-27 2003-09-19 삼성광주전자 주식회사 진공청소기의 사이클론 집진장치
KR100398684B1 (ko) * 2000-11-27 2003-09-19 삼성광주전자 주식회사 진공청소기의 사이클론 집진장치
US20060161050A1 (en) * 2003-10-15 2006-07-20 John Butler A surgical sealing device
US7625736B2 (en) * 2004-06-04 2009-12-01 The United States Of America As Represented By The Department Of Health And Human Services Methods for preparing immunogenic conjugates
US8195080B2 (en) * 2009-10-02 2012-06-05 Xerox Corporation Waste cyclone dispense system with controlled rotating cylinder gate
US20130209181A1 (en) * 2012-02-15 2013-08-15 Gregory A. Van Arsdale Self-emptying vacuum apparatus for use by gold prospectors
CA3071898C (en) 2017-07-14 2023-03-07 Vermeer Manufacturing Company Hydro excavation vacuum apparatus
EP3492184A1 (de) 2017-12-04 2019-06-05 Klingmill AB Vorrichtung zur trennung von partikeln unterschiedlicher grösse
CN110252530A (zh) * 2019-06-22 2019-09-20 徐州华正铸业有限公司 一种用于煤气的旋风除尘器卸料装置

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE849950C (de) * 1942-09-03 1952-09-18 Fritz Von Gahlen K G Fliehkraftentstauber
GB686966A (en) * 1951-11-09 1953-02-04 Richard Fritz Heinrich Improvements relating to cyclone dust separators
US3716137A (en) * 1969-03-21 1973-02-13 Celleco Ab Cyclone separator
GB1391835A (en) * 1971-05-10 1975-04-23 Ricoh Kk Electrophotocopying amchines
US4233382A (en) * 1978-10-27 1980-11-11 E. I. Du Pont De Nemours And Company Electrostatic transfer of magnetically held toner images

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JPS5873280A (ja) * 1981-10-27 1983-05-02 Hitachi Ltd 信号２値化処理装置
JPS6048180A (ja) * 1983-08-29 1985-03-15 三菱化工機株式会社 自動選別機の移載装置
JPS6178465A (ja) * 1984-09-27 1986-04-22 Uchu Kagaku Kenkyusho 低反射性表面の形成方法
FR2586366B1 (fr) * 1985-08-22 1988-02-12 Sames Sa Procede de recuperation de poudre et dispositif pour la mise en oeuvre de ce procede
CA1286345C (en) * 1986-06-19 1991-07-16 Llewellyn Ernest Depew Feed and separation device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE849950C (de) * 1942-09-03 1952-09-18 Fritz Von Gahlen K G Fliehkraftentstauber
GB686966A (en) * 1951-11-09 1953-02-04 Richard Fritz Heinrich Improvements relating to cyclone dust separators
US3716137A (en) * 1969-03-21 1973-02-13 Celleco Ab Cyclone separator
GB1391835A (en) * 1971-05-10 1975-04-23 Ricoh Kk Electrophotocopying amchines
US4233382A (en) * 1978-10-27 1980-11-11 E. I. Du Pont De Nemours And Company Electrostatic transfer of magnetically held toner images

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0604029A2 (de) * 1992-12-21 1994-06-29 NCR International, Inc. Farbstrahldruckvorrichtung
EP0604029A3 (de) * 1992-12-21 1994-12-14 Ncr Int Inc Farbstrahldruckvorrichtung.
US5519420A (en) * 1992-12-21 1996-05-21 Ncr Corporation Air system to protect ink jet head
WO1997046919A1 (en) * 1996-06-06 1997-12-11 Moore Business Forms, Inc. Non-magnetic toner dynamic recycling
WO2015113779A1 (en) * 2014-01-28 2015-08-06 Koninklijke Philips N.V. Cyclonic separation device
RU2624875C2 (ru) * 2014-01-28 2017-07-07 Конинклейке Филипс Н.В. Циклонное разделительное устройство
US9872592B2 (en) 2014-01-28 2018-01-23 Koninklijke Philips N.V. Cyclonic separation device

Also Published As

Publication number Publication date
FR2639559B1 (fr) 1991-01-11
ATE127039T1 (de) 1995-09-15
CA1333474C (fr) 1994-12-13
JPH02188781A (ja) 1990-07-24
DE68924045D1 (de) 1995-10-05
FR2639559A1 (fr) 1990-06-01
DE68924045T2 (de) 1996-01-25
US4996538A (en) 1991-02-26
EP0371828B1 (de) 1995-08-30

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