EP0754985A1 - Farbwerk für eine Entwicklertrommel - Google Patents

Farbwerk für eine Entwicklertrommel Download PDF

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Publication number
EP0754985A1
EP0754985A1 EP96401480A EP96401480A EP0754985A1 EP 0754985 A1 EP0754985 A1 EP 0754985A1 EP 96401480 A EP96401480 A EP 96401480A EP 96401480 A EP96401480 A EP 96401480A EP 0754985 A1 EP0754985 A1 EP 0754985A1
Authority
EP
European Patent Office
Prior art keywords
drum
inking
conveyor
printing
box
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
EP96401480A
Other languages
English (en)
French (fr)
Other versions
EP0754985B1 (de
Inventor
Bernard Cherbuy
Pierre Tisserand
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.)
Xeikon France SA
Original Assignee
Nipson SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nipson SA filed Critical Nipson SA
Publication of EP0754985A1 publication Critical patent/EP0754985A1/de
Application granted granted Critical
Publication of EP0754985B1 publication Critical patent/EP0754985B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0896—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894
    • G03G15/0898—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894 for preventing toner scattering during operation, e.g. seals
    • 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
    • G03G15/095—Removing excess solid developer, e.g. fog preventing

Definitions

  • the present invention relates to a device for inking a development drum and relates to the development of latent images in a non-impact printer at high printing speed, that is to say for speeds greater than 10 m / min. .
  • a latent image is generated on a medium and is then developed by ink made up of solid particles (toner). This toner is then transferred to the printing medium (paper, plastic, labels, ...) and finally fixed on this medium.
  • the toners concerned are of the mono-component type: the ink particles contain magnetic pigments.
  • the inking devices known to date consist in bringing the toner into contact with the medium in order to develop the latent image which is present on its surface. On the other hand, in the non-pictured areas, no toner should remain.
  • Such a device must make it possible to obtain good darkness with a minimum of background (residual toner in the non-inked areas).
  • the opposing forces are magnetic and the developing forces are electrostatic. These magnetic forces are created by magnets placed inside a tube. This device is called a magnetic brush. It is limited in writing speed and cannot be used with our technology because the magnets disturb the latent image which is itself magnetic. On the other hand, the presence of a magnetic shunt under the recording layer, due to magnetography in the case of a writing perpendicular to the surface of the medium, to allow a writing perpendicular to the surface of the medium, makes it inoperative. the opposing forces, because equivalent but opposite "image" forces are generated via this shunt, and cause a significant increase in the background.
  • the opposing forces are then mainly inter-particle cohesion forces.
  • retouching devices require for correct operation the presence of a retouching device such as that taught by European patent application EP 0142446.
  • a retouching device such as that taught by European patent application EP 0142446.
  • Such retouching devices thus made it possible to obtain printing speeds of the order a few tens of cm / s, that is to say about 15 to 20 m / min.
  • These retouching devices consisted of a rotating cylinder inside which a fixed magnet is disposed inside the rotating cylinder, the assembly being disposed near the development drum downstream of the device for applying solid particles relative to in the direction of rotation of the drum.
  • the object of the invention is therefore to overcome the drawbacks of the prior art.
  • the device for inking a developing drum comprising in an inking box a function for inking the drum, a function for magnetic retouching, a device for pneumatic touch-up and a sealing box sealing device characterized in that the printing drum is inking by a wave of solid particles of a pulverulent pigment contained in the inking box raised by means of the inking device, said wave moving in the opposite direction of the printing drum.
  • the means of the inking device comprise a magnetic conveyor drum associated with a deflector inclined with respect to the horizontal by a determined angle, said conveyor drum rotating in the opposite direction of the printing medium drum at a determined speed, said deflector being disposed downstream of the junction direction of the centers of the conveyor drum and the printing drum on the one hand at a first adjustable distance from this direction and on the other hand at a second adjustable distance from the medium drum.
  • the determined speed is between 85 rpm and 180 rpm for a printing speed of 20 to 60 m / min.
  • the determined angle of inclination is of the order of 50 °.
  • the first adjustable distance is of the order of 0 to 5 mm
  • the second adjustable distance is of the order of 4 to 5 mm.
  • the device for calibrating the thickness of the ink layer of the inking device consists of a second conveyor drum, a device for calibrating the thickness of its ink layer, consists of '' a second lower conveyor drum arranged below the first conveyor drum, a scraper being arranged in contact with the second conveyor and providing space with the first conveyor drum and on the other hand a pressure plate disposed at a distance of the order of 3 mm from the first conveyor drum and at an angle of around 56 ° from the horizontal.
  • the scraper is placed at a distance from the first conveyor drum of the order of 2.6 min.
  • the device includes a toner beater and a sensor for determining the transfer of new quantity of toner from the reserve box to the inking box.
  • the magnetic retouching device comprises a third magnetic conveyor drum arranged at an adjustable distance and rotating at high speed in the opposite direction from the printing drum and associated with a cleaning squeegee of this third drum, said third drum being disposed downstream of the first drum with respect to the direction of rotation of the printing drum.
  • the adjustable distance is between 1 and 3 min.
  • the pneumatic retouching device comprises a suction nozzle arranged perpendicular to the printing drum to remove by suction the toner particles entrained in the wake of the other particles.
  • the sealing device comprises a sheet for closing the inking box disposed downstream relative to the direction of rotation of the medium drum, said sheet having a square shape, one of the faces of which is parallel to the drum and very close to it, a fan is arranged outside the inking box to generate an overpressure near the sheet between the suction nozzle and the box.
  • the device comprises an inking function (15) of the printing drum (1), a magnetic retouching function, a pneumatic retouching function and a function ensuring the sealing of the inking box.
  • the inking function of the printing drum is carried out by the projection of ink or toner, formed of solid particles of a pigment pulverulent having magnetic properties or not, on the drum (1) printing medium.
  • This projection is provided by an upper conveyor drum (2) on which the ink layer present on its surface is scraped by a deflector (3).
  • the speed of rotation of the conveyor drum is such that the deflector generates a "wave" of ink or toner into which the print drum will penetrate in the opposite direction to the wave.
  • a conveyor / wedge device is used to calibrate the thickness of the ink layer of the upper conveyor drum (2).
  • the toner, transported by the lower conveyor drum (6), is scraped through the wedge (7), and is brought into contact with the upper conveyor drum (2).
  • the choice of the distance (E) between the corner (7) and the upper conveyor drum (2) will allow the thickness of this layer to be adjusted.
  • the toner is kept under pressure on this upper conveyor drum (2) by the pressure plate (8) disposed at a distance (D) from the upper conveyor drum (2).
  • the toner present in the bottom of the inking box remains "fluid" thanks to the use of a mixer (9), and its level is precisely adjusted by a sensor (10) which controls the transfer of the toner, a reserve (not shown) in the box (15), as soon as the toner / sensor distance becomes too great.
  • the magnetic retouching function which consists in removing the excess toner from the inked areas is carried out by the magnetic retouching device.
  • the invention here uses a third conveyor drum (4), similar to the previous ones, rotating at high speed in the opposite direction of the printing drum (1) and cleaned by a squeegee (5).
  • the latent image being, in this new printer, formed of magnetic dots of alternating directions, each of the dots will be subjected to the alternating magnetic fields of the magnets of the retouching drum (4).
  • the speed of retouching should be high enough to avoid modulations of blackness in writing, and in particular in gray.
  • the pneumatic retouching device comprises a suction nozzle (11) arranged perpendicular to the printing medium drum (1). This device makes it possible to improve the straightness of the edges of the lines, by removing by suction, all the toner particles which are entrained in the wake of others and which come to deteriorate the sharpness of these lines.
  • the vacuum inside the suction nozzle (11) can be adjusted in order to have the best compromise between the blackness of the writing and the sharpness of the edges of the lines.
  • Inking box sealing device seals at high writing speeds> 50 m / min and prevents toner particles from being entrained by the drum outside the inking box and thus generate jobs in printing.
  • a sheet (13) for closing the inking box (15) has a square shape, one of the faces of which is parallel to the printing drum (1) and the positioning of which is adjusted. very close to it.
  • a fan (14) generates an overpressure between the pneumatic touch-up device and the inking box outlet plate (13).
  • the various conveyor drums are coated with magnetic rubber with straight poles, 2.54 mm pitch, and 1 mm thick.
  • the rotational speed of the first conveyor drum (2) is between 95 rpm and 180 rpm for a printing speed varying between 20 and 60 m / min.
  • the deflector (3) has a width of 6 mm, and its active face inclined on the order of 50 ° relative to the horizontal and the edge of the deflector (3) located near the conveyor drum (2) is disposed at an adjustable distance (B) between 0 and 5 mm, while the upper edge of the deflector disposed near the printing drum (1) is disposed at a distance (A) adjustable between 4 and 5 mm.
  • the space (E) available between the lower corner (7) and the conveyor drum (2) is of the order of 2.6 mm.
  • the pressure plate (8) located between the beater drum (9) and the lower conveyor drum (6) has an inclination relative to the horizontal of the order of 56 °.
  • the upper end of the sheet (8) is at a distance (D) of the order of 3 mm from the upper conveyor drum (2).
  • the magnetic retouching conveyor drum (4) is arranged at a distance (C) adjustable from 1 to 3 mm from the printing drum (1).
  • the speed of rotation of the magnetic retouching drum (4) is between 85 and 160 rpm for a writing speed varying from 20 to 60 m / min.
  • the closing plate (13) is arranged at an adjustable distance of the order of 0.15 to 0.25 mm from the printing drum (1).
  • a magnetic conveyor drum (2) is covered with a layer of toner, due to the magnetic attraction between the toner and this conveyor drum (2).
  • This fairly compact layer is separated from the conveyor by the action of a deflector (3).
  • the thickness of the toner layer entrained by the conveyor drum between the latter and the squeegee (7) is limited by the dimension E to a value of 2.6 mm. Furthermore, the distance between the upper edge (30) of the deflector and the medium drum (1) is greater than the value of the thickness of the toner layer entrained by the conveyor drum (2). If there was no detachment and creation of a wave, the toner would not come into contact with the medium drum (1).
  • the toner In the inking area, the toner is not compacted and the ink particles are projected against the drum.
  • the device allows an increase in the speed of the conveyor drum and the speed of the printing drum, which gives a correct inking for high writing speeds, such as 60 m / min, in particular in the case fine horizontal lines.
  • the distance between the printing drum (1) and the deflector (3) which is of the order of 5 mm, makes it possible to avoid the presence of agglomerates in this area, and the generation of traces. white in writing.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP19960401480 1995-07-19 1996-07-04 Farbwerk für eine Entwicklertrommel Expired - Lifetime EP0754985B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9508748 1995-07-19
FR9508748A FR2737023B1 (fr) 1995-07-19 1995-07-19 Dispositif d'encrage d'un tambour de developpement

Publications (2)

Publication Number Publication Date
EP0754985A1 true EP0754985A1 (de) 1997-01-22
EP0754985B1 EP0754985B1 (de) 2001-06-13

Family

ID=9481147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960401480 Expired - Lifetime EP0754985B1 (de) 1995-07-19 1996-07-04 Farbwerk für eine Entwicklertrommel

Country Status (3)

Country Link
EP (1) EP0754985B1 (de)
DE (1) DE69613281D1 (de)
FR (1) FR2737023B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784724A2 (de) 2013-03-27 2014-10-01 Féinics AmaTech Teoranta Selektive Abscheidung von magnetischen Teilchen und Verwendung von magnetischem Material als Trägermedium zur Abscheidung anderer Teilchen
US9251458B2 (en) 2011-09-11 2016-02-02 Féinics Amatech Teoranta Selective deposition of magnetic particles and using magnetic material as a carrier medium to deposit nanoparticles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138672A (en) * 1981-02-20 1982-08-27 Fujitsu Ltd Dry printer
EP0086683A1 (de) * 1982-02-11 1983-08-24 COMPAGNIE INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Vorrichtung zum Aufbringen von Feststoffteilchen auf einen Aufzeichnungsträger einer Druckvorrichtung
JPS60120372A (ja) * 1983-12-02 1985-06-27 Matsushita Electric Ind Co Ltd カラ−画像形成装置
JPS6135474A (ja) * 1984-07-28 1986-02-19 Ricoh Co Ltd 画像形成装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138672A (en) * 1981-02-20 1982-08-27 Fujitsu Ltd Dry printer
EP0086683A1 (de) * 1982-02-11 1983-08-24 COMPAGNIE INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Vorrichtung zum Aufbringen von Feststoffteilchen auf einen Aufzeichnungsträger einer Druckvorrichtung
JPS60120372A (ja) * 1983-12-02 1985-06-27 Matsushita Electric Ind Co Ltd カラ−画像形成装置
JPS6135474A (ja) * 1984-07-28 1986-02-19 Ricoh Co Ltd 画像形成装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
D.G. PARKER, ST.B. SWACKHAMER: "Background scheme for a magnetographic machine", XEROX DISCLOSURE JOURNAL, vol. 9, no. 2, March 1984 (1984-03-01), STAMFORD, CONNECTICUT, USA, pages 95 - 96, XP002015506 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 241 (P - 158) 30 November 1982 (1982-11-30) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 276 (P - 402) 2 November 1985 (1985-11-02) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 190 (P - 474) 4 July 1986 (1986-07-04) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9251458B2 (en) 2011-09-11 2016-02-02 Féinics Amatech Teoranta Selective deposition of magnetic particles and using magnetic material as a carrier medium to deposit nanoparticles
EP2784724A2 (de) 2013-03-27 2014-10-01 Féinics AmaTech Teoranta Selektive Abscheidung von magnetischen Teilchen und Verwendung von magnetischem Material als Trägermedium zur Abscheidung anderer Teilchen

Also Published As

Publication number Publication date
FR2737023A1 (fr) 1997-01-24
EP0754985B1 (de) 2001-06-13
FR2737023B1 (fr) 1997-08-22
DE69613281D1 (de) 2001-07-19

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