EP0984336B1 - A device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer - Google Patents
A device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer Download PDFInfo
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- EP0984336B1 EP0984336B1 EP19980203008 EP98203008A EP0984336B1 EP 0984336 B1 EP0984336 B1 EP 0984336B1 EP 19980203008 EP19980203008 EP 19980203008 EP 98203008 A EP98203008 A EP 98203008A EP 0984336 B1 EP0984336 B1 EP 0984336B1
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- printing
- developer
- engines
- width
- large format
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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
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
- G03G15/344—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array
- G03G15/346—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array by modulating the powder through holes or a slit
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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
Definitions
- This invention relates to a printing apparatus for large format printing. It relates especially to a large format printer comprising electrostatographic printing devices.
- a well known digital addressable printing technique that is useful for large format printing is ink-jet printing, both with water based inks and with solvent based inks.
- An example of an ink-jet printer for large format printing can be found in, e.g. US-A-5 488 397 , wherein a printer is disclosed having two or more parallel ink-cartridges shuttling over the width of the substrate to be printed while the substrate moves in a direction basically perpendicular to the direction of movement of the shuttling ink-cartridges.
- EP-A-526 205 again an ink-jet printer is disclosed, wherein only one printing engine (ink-jet head) having a multiple array of nozzles is moved as a shuttle over the paper.
- a commercial ink-jet printer IDANIT 162Ad (trade name) available from Idanit Technologies, Israel, uses multiple ink-jet printheads mounted in a staggered position over the width of the substrate to be printed.
- the printing substrate has to pass several times under the array of staggered ink-jet printheads while between each pass the printheads are slightly moved with respect to the drum in a direction parallel to the width of the substrate.
- This multi-pass printing enhances the resolution that can be printed, while in the printhead itself the nozzle can be positioned fairly far apart.
- the same concept (but with much less printheads) has also be commercially implemented in printers such as the Lasermaster DesignWinder, Iris Realist, Stork Textile Proofer, Polaroid DryJet, ... and is e.g. further described in WO-A-96/34762.
- ink-jet printing provides the possibility for printing large formats in short time, the resulting printing quality is not always up to the demands, the stability of the image in, e.g. billboards where the image has to be weatherproof leaves still room for improvement.
- an electrophotographic printer wherein a single photoconductor is exposed to the light of several exposure units, so a large latent image can be written on the photoconductor and after development be transferred to a final substrate.
- the printer having the largest printing width for printing full colour images based on electrophotographic techniques is e.g. the Xeikon DCP50, having a printing width of 50 cm.
- full colour printing machines having a printing with of 54 inch are available, said devices being fed with liquid electrophotographic developer.
- WO-A-96/18506 a shuttling printer using more than one Direct Electrostatic Printing (DEP) engine is disclosed wherein these engines are placed one after the other for printing multi-colour swaths.
- DEP Direct Electrostatic Printing
- toner particles are deposited directly in an image-wise way on a receiving substrate, the latter not bearing any image-wise latent electrostatic image.
- a DEP device is disclosed in e.g. US-A-3 689 935 .
- This document discloses an electrostatic line printer having a multi-layered particle modulator or printhead structure comprising :
- Each control electrode is formed around one aperture and is isolated from each other control electrode.
- Selected electric potentials are applied to each of the control electrodes while a fixed potential is applied to the shield electrode.
- An overall applied propulsion field between a toner delivery means and a support for a toner receiving substrate projects charged toner particles through a row of apertures of the printhead structure.
- the intensity of the particle stream is modulated according to the pattern of potentials applied to the control electrodes.
- the modulated stream of charged particles impinges upon a receiving substrate, interposed in the modulated particle stream.
- the receiving substrate is transported in a direction perpendicular to the printhead structure, to provide a line-by-line scan printing.
- the shield electrode may face the toner delivery means and the control electrodes may face the receiving substrate.
- a DC-field is applied between the printhead structure and a single back electrode on the receiving substrate. This propulsion field is responsible for the attraction of toner to the receiving substrate that is placed between the printhead structure and the back electrode.
- EP-A-849 087 a single pass large format printer is disclosed, having at least two printing engines (DEP engines or electrophotographic engines) which are staggered with respect to the printing direction so that a large format image can be printed which is larger in size than the printing width of one of said printing engines.
- EP-A-849-645 a large format printer is disclosed having a page wide DEP-printhead structure combined with multiple smaller sized toner applicator modules
- EP-A-849 640 a large format printer is disclosed having a page wide photoconductor combined with multiple smaller sized toner delivery means.
- a single pass printer as defined in the claims, having a printing width (PW) for printing a toner image on a substrate, the substrate having a width (WS) and a length (LS), wherein, a number n, equal to or larger than 2, of printing engines each with a container for developer, said container having an active portion and with a printing width PWEi, in a direction of a longitudinal axis, smaller than said printing width PW is provided, said number n being chosen such that characterised in that
- said printing width is at least 40 cm, and said longitudinal axes are essentially parallel.
- said printing engines are electro(stato)graphic engines, especially Direct Electrostatic Printing (DEP) engines, or electrophotographic engines.
- Figure 1 is a schematic illustration of a large format single pass printer with at least 2 printing engines and with a central conditioning unit according to the present invention.
- Figure 2 shows schematically an other embodiment of a large format single pass printer with at least 2 printing engines and with a central conditioning unit according to the present invention.
- Figure 3 shows schematically a large format single pass printer that can be equipped with a central conditioning unit according to the present invention.
- Figure 4 shows schematically an other implementation of a large format single pass printer that can be equipped with a central conditioning unit according to the present invention.
- Figure 5 shows schematically a large format single pass printer with at least 2 printing engines and with a central conditioning unit according to the present invention, wherein the printing engines are engines for Direct Electrostatic Printing.
- Figure 6 shows schematically a large format single pass four colour printer using at least two electrophotographic printing engines equipped with central conditioning units according to this invention.
- Figure 7 shows schematically a large format single pass printer with a shuttle using at least two electrophotographic printing engines to be equipped with central conditioning units according to this invention.
- central conditioning unit is used to describe a unit wherein the condition of the developer is monitored, controlled and wherein the condition of the developer (especially with respect to the concentration and the charge of the toner) is kept constant during printing.
- active portion of container for developer is used to indicate the portion of the container wherein either the sleeve of the magnetic brush, in a printing engine working with a developer containing magnetic particles, or the surface dispensing roller, in a printing engine working with a non-magnetic mono component developer, are loaded with charged toner particles via direct contact between the toning material and the sleeve or the dispensing roller.
- said active portion is e.g. the portion in the magnetic brush assembly in which developer is jumped to the sleeve of the magnetic brush by, e.g. a rotating transport screw. Additional transport screws or paddles delivering developer to said active portion, but not delivering said developer material directly to said sleeve is the "non-active portion of the container".
- toner transferring element or elements is used to designate those parts of a printing engine used to provide a toner image either on an intermediate image bearing member or on a final substrate to be printed.
- the "toner transferring element” or “element for applying toner particles” is or are the row(s) of printing apertures in the printhead structure.
- the "toner transferring element” or “element for applying toner particles” is or are the latent image bearing member(s).
- staggered printing engines is used to indicate a number of printing engines (at least two), each of the printing engines comprising a toner transferring element, that are positioned in the printer so that at the longitudinal axis of the toner transferring means, comprised in at least two of the number of printing engines do not coincide.
- substrate or "image receiving element” can in this document mean a final image receiving element whereon the toner image is printed, as well as an “intermediate image receiving member” used to accept a toner image and to transfer that image to a final image receiving member.
- the width of the image receiving substrate (WS) is the dimension of that substrate that is essentially perpendicular to the direction of movement of the substrate in the printer.
- the length of the image receiving substrate (WL) is the dimension of that substrate that is essentially parallel to the direction of movement of the substrate in the printer.
- a fast high resolution printer for large large (large means herein having a surface of at least 0.25 m 2 and an image width of at least 30 cm) formats could be built.
- a printer according to this invention can be constructed in such a way that any printing width, from 10 cm up to more than, e.g., 5 meter, can be realised.
- a printer according to this invention is manufactured such as to have a printing width (PW) of at least 40 cm, preferably of at least 60 cm and more preferably of at least 120 cm.
- a printer according to this invention is a "single pass” printer, i.e. the substrate passes the printing engines only once.
- a printer wherein several printing engines are rigidly mounted over the total width of the substrate to be printed, so that the longitudinal axis of the toner transferring elements of at least two of the printing engines do not coincide, and that is equipped with means for moving said substrate with respect to said printing engines in a single direction, is a single pass printer according to the present invention.
- all the image information being adapted to be printed with printing engines with width WPE, i.e. a printing line
- WPE width
- a central conditioning unit did not only simplify the large format single pass printer and make it less expensive and less bulky (without such a central unit every printing engine needs to have its own developer control and monitoring unit) but did also lead to better image quality that remained unaltered over a longer period of printing.
- the developer in perfect condition with the aid of a central conditioning unit it was necessary that the developer circulated quite rapidly from the central conditioning unit to the printing engines and back.
- the circulating speed is chosen such that at any moment during printing at most 25 % by volume of the developer is present in the active portion of the container for developer in the printing engines while at least 75 % are continuously being circulated through the central conditioning unit for keeping its condition constant.
- the central conditioning unit can be connected not only to a circuit for circulating developer to all printing engines but also to a reservoir of fresh toner particles.
- the connection with said reservoir is equipped with a valve that selectively can be opened and closed depending on the condition of the developer in the central conditioning unit.
- the toner particles that are not used in the transfer to the substrate can be recovered and also connected in the central conditioning unit so that these non-used toner particles are recycled instead of simply dumped.
- FIG 1 a schematic view of a central conditioning unit useful in this invention is shown coupled to three printing engines (100a, 100b and 100c).
- Each of printing engines comprises a container (101a, 101b and 101c) for developer from where the toner particles are brought to the toner transfer means (not shown).
- a container (122) is present wherein the developer (102) containing toner particles (102a) and carrier particles (102b) can be mixed by one or more mixing means (117). The mixing provides a tribo-electric charge on the toner particles.
- the container is coupled to inlets (120a, 120b, 120c) over a collection vessel (120') for the developer circulating between the containers for developer of each of the printing engines and the container (122).
- Means for moving (116) the developer towards the container are also provided.
- the means for moving the developer (116, 116a) or the non-used toner particles (116b in Fig.2) can be any means known in the art, e.g. paddles moved by a motor, pumps, Archimedian screws, etc.
- the container contains further an outlet (121) coupled to each of the printing engines, this outlet is also provided with means (116a) for moving the conditioned developer towards the various printing engines using a distribution box (121') through ducts (121a, 121b and 121c).
- the container (122) is further coupled to a vessel (119) containing fresh toner particles , said vessel being coupled to said container over valve (119a) that can selectively be opened and closed.
- the container (122) is coupled to means for monitoring the condition of the developer i.e. to means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles.
- the means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles are coupled to the valve (119a) for selectively opening and closing said valve depending on the measured result of the developer condition and the intended one.
- said means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles can be coupled to the mixing means (117) so that also the mixing can be used to control the charge of the toner particles to a predetermined constant value.
- the means for moving (116, 116b) the non-used toner particles and the developer from the printing engines towards the container and the means (116a) for moving the conditioned developer from the central conditioning unit towards the various printing engines are equipped for giving such a circulating speed to the developer that at any moment during printing at most 25 % by volume of the developer is present in the active portion of the container for developer in (101a, 101b and 101c) the printing engines while at least 75 % are continuously being circulated through the central conditioning unit for keeping its condition constant.
- the ducts connecting the central conditioning unit with the various printing engines can be made from rigid material as well as of flexible material. It is preferred to use ducts in flexible polymeric material.
- FIG 2 a schematic view of a central conditioning unit useful in this invention is shown coupled to three printing engines (100a, 100b and 100c) as in figure 1.
- the printing engines are further equipped with means (114a, 114b and 114c) for collecting non used toner particles, by doing so the amount of waste during printing is minimised.
- the central conditioning unit is coupled to said means for collecting the non-used toner particles using a collection vessel (115') through ducts (115a, 115b and 115c).
- Means (116b) are provided to bring the non-used toner particles from the printing engines to the container (122) in the central conditioning unit, wherein the non-used toner particles are mixed with the circulating developer and used again.
- the distribution box (121') can be omitted and the separate ducts (121a, 121b and 121c) can originate directly from the container (122) of the central unit for controlling and monitoring the developer. Also the collection vessels (115' and 120') can be omitted and the inlets (115a, 115b, 115c, 120a, 120b and 120c) can be connected directly to the container (122) of the central unit for controlling and monitoring the developer. It is also possible to omit collection vessel 115' and guiding the non-used toner particles directly into the ducts for circulating the developer. By doing so the total printer is simplified as the means for moving the non-used toner particles to the central conditioning unit can also be omitted.
- a printer wherein n printing engines, each having a printing width WPE smaller than the printing width PW, are spread over the total printing width so that the total printing width can be printed in a single pass can be constructed as shown in the schematic perspective view in figure 3.
- Three printing engines (100a, b and c), each with a printing width WPEa, WPEb and WPEc and a respective longitudinal axis in the direction of said printing width are positioned in a staggered configuration under an image receiving substrate (109), having a width (WS) and a length (LS) and travelling in the direction of arrow A. (in fig 2. the substrate is shown as transparent for the sake of clarity).
- the respective widths of the printing engines, the number, n, of printing engines and an optional overlap of some or all of the printing engines, is chosen in such a way that the desired printing width (PW), preferably larger than 40 cm, is reached, therefore said number n is chosen such that
- a colour printer according to this invention comprises, multiple sets of staggered printing engines, e.g., one set for each colour to be printed.
- a printer according to the first specific embodiment of this invention wherein each set of staggered printing engines prints only one colour, will for printing four colours, e.g., yellow, magenta, cyan and black (YMCK), comprise four sets of staggered printing engines.
- each of said four sets of printing engines is preferably coupled to a central unit for controlling and monitoring the developer according to this invention.
- FIG 4 a schematic perspective view of a further large format single pass printer that beneficially can be equipped with a central conditioning unit according to this invention is shown.
- Each printing engine (100a, b, c, d, and e), each with a printing width WPEa, WPEb, WPEc, WPEd and WPEe and respective longitudinal axis in the direction of said widths are rigidly arranged so that the respective longitudinal axis are essentially parallel to each other and that the centre points of the respective printing widths are on one line.
- This line is preferably essentially parallel to the width (WS) of the substrate to be printed.
- the respective longitudinal axis form an angle ⁇ (0° ⁇ a ⁇ 90°) with the line through the centre point.
- the respective widths of the printing engines are equal and the number of printing engines installed for realising a printer with printing width (PW) is determined as a function of the width of the printing engine and angle ⁇ according to the formula : n > PW/ ((cos ⁇ ).WPE).
- the angle a can be calculated from the formula above.
- the angle ⁇ is minimally 27°.
- a colour printer comprises, multiple sets of printing engines, e.g., one set for each colour to be printed, arranged as shown in figure 4.
- a printer according to the second specific embodiment of this invention wherein each set of printing engines print only one colour, will for printing four colours, e.g., yellow, magenta, cyan and black (YMCK), comprise four sets of printing engines. These sets can then be located one after an other and the substrates moves past said four sets, but since each set prints the totality of a line at once in one colour, the printer is still a single pass printer.
- each of said four sets of printing engines is preferably coupled to a central unit for controlling and monitoring the developer according to this invention.
- the printing engines used in this invention, are preferably electro(stato)graphic printing engines and especially electrophotographic and direct electrostatic printing (DEP) engines.
- the printing engines are direct electrostatic printing engines.
- Typical DEP devices useful for implementing the present invention have been disclosed in, e.g. EP-A 675 417, EP-A 708 386, EP-A 710 897, EP-A 710 898, EP-A 731 394, EP-A 736 822, US-A-5 539 438, US-A-5 202 704, US-A-5 283 594, US-A-5 036 341, US-A-5 374 949, US-A-4 814 796, US-A-5 204 696, US-A-5 327 169, etc.
- a large format printer using at least two printing engines coupled to a central conditioning unit has DEP engines as described in European Application 98202607.2 filed on August 3, 1998.
- a schematic, non-limitative, example of a large format printer incorporating a central conditioning unit according to this invention and having at least 2 DEP engines (engines for Direct Electrostatic Printing) each with printing width WPE smaller than the printing width of the printer is shown in figure 5.
- the printer comprises means for moving a substrate (109) to be printed in the direction of arrow A at linear speed LSS, and means for fixing (110) the toner image to the substrate.
- Two identical DEP engines (100a and 100b) are shown, coupled to a single central conditioning unit.
- Each of the DEP engines has a back electrode (105) located on the same first side of the substrate to be printed, the back electrodes are kept at a DC-voltage (V4). This voltage is preferably the same in all DEP engines present in the printer.
- a population of charged toner particles is generated in a magnetic brush assembly (104), with a non-magnetic sleeve (104b) and a magnetic core (104a).
- a DC-field (V5) and/or an AC-field (AC1) charged toner particles are jumped from said sleeve (104b) of the magnetic brush (104), rotating in the direction of arrow C with a linear surface speed, LSM to the surface (103a) of a Charged Toner Conveyer (CTC)(103), that has a radius R and that rotates in the direction of arrow B at a linear surface speed.
- CTC Charged Toner Conveyer
- the surface of the CTC is kept at a DC voltage (V1) and/or an AC voltage (AC2).
- the DC voltage (V1) on the surface of the CTC is different from the DC voltage (V4) on the back electrode.
- V1 on the surface of the CTC is different from the DC voltage (V4) on the back electrode.
- a propulsion field is created between the surface of the CTC and the back electrode wherein a flow (111) of charged toner particles from the CTC to the back electrode is created.
- a printhead structure (106) comprising printing apertures (107) and a common shield electrode (106b) is placed in that flow.
- the surface of the CTC is moved near the printing apertures (107) to bring said charged toner particles in the development zone (113).
- This development zone is the space between the surface of the CTC and printhead structure wherein the propulsion field creates said flow (111) of toner particles towards an image receiving member (109) to be printed.
- a control electrode is present, applying an image-wise varying DC voltage (V3) to control electrodes (106a) around the printing apertures, the strength of the propulsion field can be changed so as to let said charged toner particles image-wise pass the printing apertures.
- the remaining charged toner particles are further displaced downstream of the printing zone to a cleaning station (114, 115) in which the non-used toner particles are completely removed from the surface of said CTC to have a bare surface again.
- the CTC moves further on towards the magnetic brush , located upstream of the development zone where again a fresh population of charged toner particles, wherein no wrong sign toner particles are present, is provided on the surface of the CTC.
- a fresh population of charged toner particles wherein no wrong sign toner particles are present.
- the means for moving the developer are equipped so as to have at any moment during printing at most 25 % by volume of the developer is present in the active portion of the containers (101a, and 101b in Fig 1,2) of the printing engines while at least 75 % are continuously circulated through the central conditioning unit for keeping its condition constant.
- the container (122) is further coupled to a vessel (119) containing fresh toner particles , said vessel being coupled to said container over valve (119a) that can selectively be opened and closed.
- the container (122) is coupled to means for monitoring the condition of the developer i.e. to means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles.
- the means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles are coupled to the valve (119a) for selectively opening and closing said valve depending on the measured result and the intended one.
- said means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles can be coupled to the mixing means (117) so that also the mixing can be used to control the charge of the toner particles to a predetermined constant value.
- the non-used toner particles that have been removed by collecting means (114, 115) from the CTC in every printing unit are recycled to the single central conditioning unit by means (116b) for moving the non-used toner over a collecting box (115')
- the location and/or form of the shield electrode (106b) and the control electrode (106a) can, in other embodiments of a device for a DEP method using toner particles according to the present invention, be different from the location shown in fig. 5.
- a DEP method using toner particles according to the present invention using devices with different constructions of the printhead (106). It is, e.g. possible to implement a DEP method with a device having a printhead comprising only one electrode structure as well as with a device having a printhead comprising more than two electrode structures.
- the apertures in these printhead structures can have a constant diameter, or can have a broader entrance or exit diameter.
- the back electrode (105) of this DEP device can also be made to co-operate with the printhead structure, said back electrode being constructed from different styli or wires that are galvanically isolated and connected to a voltage source as disclosed in e.g. US-A-4,568,955 and US-A-4,733,256.
- the back electrode, co-operating with the printhead structure can also comprise one or more flexible PCB's (Printed Circuit Board).
- V3 is selected, according to the modulation of the image forming signals, between the values V3 0 and V3 n , on a time basis or grey-level basis.
- Voltage V4 is applied to the back electrode behind the toner receiving member. In other embodiments of the present invention multiple voltages V2 0 to V2n and/or V4 0 to V4n can be used.
- Voltage V5 is applied to the surface of the sleeve of the magnetic brush.
- an additional AC-source can beneficially be connected to the sleeve of said magnetic brush.
- the magnetic brush 104 preferentially used in a DEP device according to the present invention is of the type with stationary core and rotating sleeve.
- any type of known carrier particles and toner particles can successfully be used. It is however preferred to use "soft" magnetic carrier particles.
- Soft magnetic carrier particles useful in a DEP device according to a preferred embodiment of the present invention are soft ferrite carrier particles. Such soft ferrite particles exhibit only a small amount of remanent behaviour, characterised in coercivity values ranging from about 4 kA/m up to 20 kA/m (50 up to 250 Oe).
- Further very useful soft magnetic carrier particles for use in a DEP device according to a preferred embodiment of the present invention, are composite carrier particles, comprising a resin binder and a mixture of two magnetites having a different particle size as described in EP-B 289 663.
- the particle size of both magnetites will vary between 0.05 and 3 ⁇ m.
- the carrier particles have preferably an average volume diameter (d v50 ) between 10 and 300 ⁇ m, preferably between 20 and 100 ⁇ m. More detailed descriptions of carrier particles, as mentioned above, can be found in EP-A-675 417.
- toner particles with an absolute average charge over mass ratio (
- the charge to mass ratio of the toner particles is measured by mixing the toner particles with carrier particles, and after 15 min of charging the q/m-ratio is measured with a device such as the Toshiba TB-200 blow-off tester.
- the charge to mass ratio is taken as the absolute value, as a DEP device according to this invention can function either with negatively charged toner particles or with positively charged toner particles depending on the polarity of the potential difference between V1 and V4.
- the toner particles used in a device according to the present invention have an average volume diameter (d v50 ) between 1 and 20 ⁇ m, more preferably between 3 and 15 ⁇ m. More detailed descriptions of toner particles, as mentioned above, can be found in EP A 675 417 that is incorporated herein by reference.
- toner particles with a narrow charge distribution i.e. the charge of the toner particles shows a distribution wherein the coefficient of variability ( ⁇ ), i.e. the ratio of the standard deviation to the average value, is equal to or lower than 0.4 preferably lower than 0.3.
- ⁇ coefficient of variability
- the charge distribution of the toner particles is measured by an apparatus sold by Dr. R. Epping PES-Laboratorium D-8056 Neufahrn, Germany under the name "q-meter.
- a DEP device making use of the above mentioned marking toner particles can be addressed in a way that enables it to give black and white. It can thus be operated in a "binary way", useful for black and white text and graphics and useful for classical bi-level half-toning to render continuous tone images.
- a large format printer according to this invention using DEP devices is especially suited for rendering an image with a plurality of grey levels.
- Grey level printing can be controlled by either an amplitude modulation of the voltage V3 applied on the control electrode 106a or by a time modulation of V3. By changing the duty cycle of the time modulation at a specific frequency, it is possible to print accurately fine differences in grey levels. It is also possible to control the grey level printing by a combination of an amplitude modulation and a time modulation of the voltage V3, applied on the control electrode.
- the outlet of developer in the individual printing engines (120a, 120b, 120c) is used as transportation help in the recovery system for non-used toner , thus the ducts (115a, 115b, 115c) for non-used toner are led in the outlet of developer in the individual printing engines (120a, 120b, 120c) so that said recovered toner particles can be transported to said central conditioning station with the aid of said developer material that also has to be transported to said central conditioning unit. It is equally well suitable to lead the outlets of developer in the individual printing engines (120a, 120b, 120c) directly to the collecting means (114,115) of the different printing units and transporting said combined used developer and recuperated toner to said central conditioning unit.
- large format printers using at least two printing engines coupled to a central conditioning unit according to this invention can be implemented with classical electrophotographic printing engines. Examples of such printers are described in figures 4 and 5 of EP-A-849 087 that is incorporated herein by reference.
- FIG 6 a large format single pass four colour printer using at least two electrophotographic printing engines equipped with central conditioning units according to this invention is shown.
- the printer comprises means (108) to move the substrate (109) in web form, withdrawn from a roll (109') in the direction of arrow A and means (110) to fix the toner image to the substrate.
- the printer is shown with only two printing stations (engines) (100a and b), each having an intermediate toner receiving member (206a and b), rotating in the direction of the arrow.
- the stations (100a and b) comprise further, arranged around each of the intermediate members (206a and b), electrophotographic engines (Y, M, C, K), for each colour, that image-wise deliver toner particles to the intermediate member.
- Each of the electrophotographic engines comprises a photoconductive drum (201), rotating in the direction of the arrow.
- the photoconductive drum contacts the intermediate member (206) or is arranged very close to it.
- Around each photoconductive drum are arranged in the direction of rotation : a cleaning unit (202), a charging unit (203), an exposure unit (204) and a toner delivering unit (205).
- the toner delivering unit (205) of each of the electrophotographic engines the in printing engines (100a and 100b)containing developer of the same colour are connected to a central conditioning unit according to this invention.
- the means for moving the developer are equipped so as to have at any moment during printing at most 25 % by volume of the developer is present in the active portion of the toner delivering unit (205) of the printing engines while at least 75 % are continuously circulated through the central conditioning unit for keeping its condition constant.
- the container (122) is further coupled to a vessel (119) containing fresh toner particles , said vessel being coupled to said container over valve (119a) that can selectively be opened and closed.
- the container (122) is coupled to means for monitoring the condition of the developer i.e. to means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles.
- the means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles are coupled to the valve (119a) for selectively opening and closing said valve depending on the measured result and the intended one.
- said means for measuring the ratio of toner to carrier particles (118) and/or the charge of the toner particles can be coupled to the mixing means (117) so that also the mixing can be used to control the charge of the toner particles to a predetermined constant value.
- the non-used toner particles that have been removed in the cleaning unit (202) are recycled to the single central conditioning unit by means (116b) for moving the non-used toner over a collecting box (115').
- Transfer means e.g. a transfer corona, can be incorporated in the printing engines to assist both the transfer of the toner particles from the latent image bearing member to the intermediate member and from the intermediate member to the substrate to be printed. Only the coupling of the electrophotographic printing engines for printing the yellow image to the central conditioning unit are shown in the figure. The three other central conditioning units are very schematically shown and are marked M, K, C to indicate that these are coupled to the printing engines printing printing printing the magenta, cyan and black image respectively.
- a moving shuttle-type printer wherein the shuttle has a wide printing width and carries at least two printing engines so that a large format image is written in separate image bands (swaths)
- a central conditioning unit according to this invention when the printing engines on the shuttle printing the same colour are coupled to a central conditioning unit.
- Such a printer has been disclosed in EP-A-849 087.
- An implementation according to the present invention has the additional benefit that said moving shuttle system does not need multiple heavy developer supplies, so that its movement can be made less complicated and less expensive thanks to said central conditioning unit that can be placed on the moving parts of the shuttle printer, but preferably it is NOT placed upon said moving parts of said shuttle type printer.
- the shuttle is travelling over the image receiving member (substrate) in a first direction, preferably a direction that is essentially parallel to the width of the substrate to be printed. After having printed a single band over the width of the substrate, the substrate is moved in a direction different from said first direction, over a length corresponding to the width of the printhead structure and toner delivering means.
- the shuttle can have a printing with of at least 30 cm, preferably the shuttle has a printing width of at least 40 cm, more preferably 60 cm, and for printing very large substrate in a short printing time, even at least 120 cm. This is different from the shuttling printers known in the art while by a shuttle of this invention broader bands can be printed.
- shuttling printer can very beneficially be used for printing images of very large dimension (e.g. > 5 meter width) with a very high printing speed (e.g. > 500 m 2 /hour).
- a shuttle according to the present invention can, e.g., comprises three printing engines with a width of, e.g., 0.3 m, that are staggered and mounted in a shuttle in such a way that the three engines shuttle together without changing their relative positions to each other.
- Such a printer makes it possible, when the shuttling proceeds with the longest dimension of the shuttling printers (i.e. in this example 0.9 m width) perpendicular to the width of the large substrate, to print in one shuttle movement a band that is 0.9 m wide. It is clear that such a shuttle can be constructed with less or more printing engines, with wider or smaller engines, etc., without going beyond the scope of this invention.
- FIG 7 a schematic view of a printer with shuttling printing engines is shown as a projection of the shuttle in the plane of the substrate (109) to be printed.
- the shuttle (112) comprising 3 printing engines (100a, b and c), the respective engines having a width WPEa, b and c, moves over the width (WS) of the substrate to be printed in the direction of arrow B, and after having printed a single band over the width of the substrate, the substrate is moved in the direction of arrow A over a length corresponding to the working width (i.e. the width of the band (swath width of the shuttle, SWS) that can be printed) of the shuttle (112).
- the shuttle returns in a direction opposite to arrow B and prints the next swath.
- the carrier particles are of the carrier particles.
- a macroscopic "soft" ferrite carrier consisting of a MgZn-ferrite with average particle size 50 ⁇ m, a magnetisation at saturation of 36 ⁇ Tm 3 /kg (29 emu/g) was provided with a 1 ⁇ m thick acrylic coating. The material showed virtually no remanence.
- the toner used for the experiment had the following composition : 97 parts of a co-polyester resin of fumaric acid and bispropoxylated bisphenol A, having an acid value of 18 and volume resistivity of 5.1 x 10 16 ohm.cm was melt-blended for 30 minutes at 110° C in a laboratory kneader with 3 parts of Cu-phthalocyanine pigment (Colour Index PB 15:3).
- a resistivity decreasing substance - having the following formula : (CH 3 ) 3 N + C 16 H 33 Br - was added in a quantity of 0.5 % with respect to the binder, as described in WO-A-94/027192.
- the solidified mass was pulverised and milled using an ALPINE Fliessbettarnastrahlmühle type 100AFG (trade name) and further classified using an ALPINE multiplex zig-zag classifier type 100MZR (trade name).
- the average particle size was measured by Coulter Counter model Multisizer (trade name), was found to be 6.3 ⁇ m by number and 8.2 ⁇ m by volume.
- the toner particles were mixed with 0.5 % of hydrophobic colloidal silica particles (BET-value 130 m 2 /g).
- An electrostatographic developer was prepared by mixing said mixture of toner particles and colloidal silica in a 9 % ratio (wt/wt) with carrier particles.
- the triboelectric charging of the toner-carrier mixture was performed by mixing said mixture in a standard tumbling set-up for 10 min.
- the developer mixture was run in the magnetic brush for 5 minutes, after which the toner was sampled and the tribo-electric properties were measured using the Toshiba TB-200 blow-off device, resulting in a q/m-ratio of -14 ⁇ C/g.
- a printhead structure (106) was made from a polyimide film of 50 ⁇ m thickness, double sided coated with a 5 ⁇ m thick copper film.
- the printhead structure (106) had two rows of printing apertures.
- Each of said control electrodes was connected over 2 M ⁇ resistors to a HV 507 (trade name) high voltage switching IC, commercially available through Supertex, USA, that was powered from a high voltage power amplifier.
- the printing apertures were rectangular shaped with dimensions of 360 by 120 ⁇ m.
- the dimension of the central part of the rectangular shaped copper control electrodes was 500 by 260 ⁇ m.
- a common shield electrode (106b) was arranged around the aperture zone leaving a free polyimide zone of 1620 ⁇ m.
- Said printhead structure was fabricated in the following way. First of all the control and shield electrode pattern was etched by conventional copper etching techniques. The apertures were made by a step and repeat focused excimer laser making use of the control electrode patterns as focusing aid. After excimer burning the printhead structure was cleaned by a short isotropic plasma etching cleaning. Finally a thin coating of PLASTIK70, commercially available from Griffin Chemie, was applied over the control electrode side of said printhead structure.
- a large container for developer was used equipped with mixing means so that 20 kg of developer was constantly shaken.
- a smaller amount of developer was pumped by transport screws to the individual magnetic brush assemblies.
- No toner monitoring device was present in said container for developer. Regulation of said toner concentration was done by calculating the amount of toner printed from the image signals and adding an amount of 102 % of said calculated removed toner concentration. (It was found that about 2% of said calculated toner amount "disappeared" in the printing process).
- the charged toner conveyer (CTC) The charged toner conveyer (CTC)
- the CTC was a cylinder with a sleeve made of aluminium, coated with TEFLON (trade name of Du Pont, Wilmington, USA) with a surface roughness of 2.2 ⁇ m (Ra-value) and a diameter of 30 mm.
- the charged toner conveyer (103) was connected to an AC power supply (AC1) with a square wave oscillating field between 1750 V peak to peak at a frequency of 3.0 kHz with +50 V DC-offset.
- Said CTC was equipped with a stainless steel scraper blade removing all remaining toner particles from said CTC-surface and collecting said removed toner particles by means of a developer transport to a single container for developer.
- toner particles were propelled to this conveyer from a stationary core (104a)/rotating sleeve (104b) type magnetic brush (104) comprising two mixing rods and one metering roller. One rod was used to transport the developer through the unit, the other one to mix toner with developer.
- the magnetic brush 104 was constituted of the so called magnetic roller, which in this case contained inside the roller assembly a stationary magnetic core (104a), having three magnetic poles with an open position (no magnetic poles present) to enable used developer to fall off from the magnetic roller (open position was one quarter of the perimeter and located at the position opposite to said CTC (103).
- the magnetic brush was so constructed that during operation fresh developer was pumped into its developer container at such a large flux that a large amount of developer was also falling out of the magnetic brush again. Said amount of "exhausted" developer falling out of said magnetic brush assembly was pumped over the scraper blade means in said charged toner conveyer to said container for developer in which 20 kg of developer was present.
- the magnetic brush was connected to a DC power supply with a -50 V DC-offset.
- a scraper blade was used to force developer to leave the magnetic roller.
- a doctoring blade was used to meter a small amount of developer onto the surface of said magnetic brush.
- the sleeve was rotating at a linear surface speed (LSM) four times higher than the linear surface speed (LSC) of said CTC roller, and in a direction opposite to the rotation direction of said CTC-roller.
- the reference surface of said CTC was placed at a distance between 650 ⁇ m from the reference surface of said magnetic brush.
- a single back electrode was present behind the paper whereon the printing proceeded, the distance between the back electrode (105) and the back side of the printhead structure (d B ) was set to 1000 ⁇ m and the paper travelled a linear speed (LSM) of 200 cm/min.
- the back electrode was connected to a high voltage power supply, applying a voltage V4 of + 1000 V to the back electrode.
Description
- a layer of insulating material, called isolation layer ;
- a shield electrode consisting of a continuous layer of conductive material on one side of the isolation layer ;
- a plurality of control electrodes formed by a segmented layer of conductive material on the other side of the isolation layer ; and
- at least one row of apertures.
Preferably said printing engines are electro(stato)graphic engines, especially Direct Electrostatic Printing (DEP) engines, or electrophotographic engines.
When the toner concentration in the developer is not constant over the printing time, the amount of charged toner particles that can be brought to the substrate by the printing engine is also fluctuating in the time, which leads to reduced image quality. It is known in the art to control and monitor the condition of the developer - i.e. ratio of amount of toner particles to the amount of carrier particles, charge of the toner particles, etc. - and to automatically adapt the developer condition to the image density so that the engine prints, when driven by the same image data, the same optical density level. Means for doing so are disclosed in, e.g., EP-A-785 484, US-A-5 559 579, EP-A-687 962, US-A-5 420 617, US-A-5 231 452, etc..
Transfer means (not shown), e.g. a transfer corona, can be incorporated in the printing engines to assist both the transfer of the toner particles from the latent image bearing member to the intermediate member and from the intermediate member to the substrate to be printed. Only the coupling of the electrophotographic printing engines for printing the yellow image to the central conditioning unit are shown in the figure. The three other central conditioning units are very schematically shown and are marked M, K, C to indicate that these are coupled to the printing engines printing printing the magenta, cyan and black image respectively.
The reference surface of said CTC was placed at a distance between 650 µm from the reference surface of said magnetic brush.
Claims (10)
- A large format , single pass printer, having a printing width (PW) for printing a toner image on a substrate (109), the substrate having a width (WS) and a length (LS), wherein, a number n, equal to or larger than 2, of printing engines (101a, 101b, 101c) each with a container (100a, 100b, 100c) for developer (102), said container having an active portion and with a reprinting width (WPEa, WPEb, WPEc) PWEi, in a direction of a longitudinal axis, smaller than said printing width PW is provided, said number n being chosen such that characterised in thati)a single central conditioning unit (118,119a,122) for controlling and monitoring the condition of the developer is provided, andii)said central conditioning unit is equipped with means for circulating (116,116a) said developer to all of said n printing engines and back to said central unit.
- A large format printer according to claim 1, wherein said printing engines (100a, 100b, 100c) further comprise means for collecting (114a,114b,114c) non-used toner particles (102a) and said central condition unit (118,119a,122) is equipped to receive said non-used toner particles and with means for mixing (117,116b) said non-used toner particles with said circulating developer.
- A large format printer according to claim 1 or 2, wherein at least two of said longitudinal axis do not coincide.
- A large format printer according to any of claims 1 to 3, wherein said means for circulating (116,116a) said developer (102) from said central conditioning unit (118,119a,122) to all of said n printing engines (100a, 100b, 100c) and back to said central unit are equipped as to have at any moment during printing at most 25 % by volume of the developer present in the active portion of the containers (100a, 100b, 100c) of the printing engines (100a, 100b, 100c) while at least 75 % are continuously circulated through said central conditioning unit.
- A large format printer according to any of claims 1 to 4, wherein said printing engines (100a, 100b, 100c) are devices for direct electrostatic printing.
- A large format printer according to claim 5, wherein said devices for direct electrostatic printing use two-component developer (102) containing magnetic carrier particles (102b) and non-magnetic toner particles (102a).
- A large format printer according to claim 5, wherein said devices for direct electrostatic printing use non-magnetic mono-component developer (102).
- A large format printer according to any of claims 1 to 4, wherein said printing engines (100a, 100b, 100c) are electrophotographic units.
- A large format printer, with printing width (PW), for printing a toner image on a substrate (109), having a width (WS) and a length (LS), comprising :i)means for moving (108) said substrate a first direction,ii)means for moving a shuttle (112) having a swath width, SWS, in a second direction, different from said first direction, said shuttle carrying a number n, equal to or larger than 2, of printing engines (100a, 100b, 100c) each with a printing width (WPEa, WPEb, WPEc) PWEi, in a direction of a longitudinal axis, smaller than said swath width, SWS, said number n being chosen such that characterised in that a single central conditioning unit (118, 119a, 122) for controlling and monitoring the condition of the developer (102) is provided, and said central conditioning unit is further equipped with means for circulating (116, 116a,116b) said developer to all of said n printing engines and back to said central unit.
- A large format printer according to claim 9, wherein at least two of said longitudinal axis do not coincide.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998600473 DE69800473T2 (en) | 1998-09-08 | 1998-09-08 | Format printing device with a single central toner control and monitoring unit |
EP19980203008 EP0984336B1 (en) | 1998-09-08 | 1998-09-08 | A device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer |
JP25012899A JP2000085173A (en) | 1998-09-08 | 1999-09-03 | Printer for large format |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980203008 EP0984336B1 (en) | 1998-09-08 | 1998-09-08 | A device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer |
Publications (2)
Publication Number | Publication Date |
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EP0984336A1 EP0984336A1 (en) | 2000-03-08 |
EP0984336B1 true EP0984336B1 (en) | 2001-01-03 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19980203008 Expired - Lifetime EP0984336B1 (en) | 1998-09-08 | 1998-09-08 | A device for large format printing comprising a single central conditioning unit for controlling and monitoring the condition of the developer |
Country Status (3)
Country | Link |
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EP (1) | EP0984336B1 (en) |
JP (1) | JP2000085173A (en) |
DE (1) | DE69800473T2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102007010276B4 (en) * | 2007-03-02 | 2010-06-10 | OCé PRINTING SYSTEMS GMBH | Apparatus and method for coloring latent images of an intermediate carrier returning toner particles to a toner box |
CN101797837B (en) * | 2010-03-09 | 2012-06-27 | 北京中科纳新印刷技术有限公司 | Large-format ink-jet printing equipment |
DE102012103338B4 (en) | 2012-04-17 | 2014-05-15 | Océ Printing Systems GmbH & Co. KG | Method for operating a digital printer for printing on a recording medium and associated digital printer with mixing container |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3483087B2 (en) * | 1995-04-14 | 2004-01-06 | 株式会社リコー | Image forming system |
EP0849645A1 (en) * | 1996-12-19 | 1998-06-24 | Agfa-Gevaert N.V. | A printer for large format printing using a direct electrostatic printing (DEP) engine |
EP0849087B1 (en) * | 1996-12-19 | 2001-05-30 | Agfa-Gevaert N.V. | A single pass printer for large format printing |
-
1998
- 1998-09-08 EP EP19980203008 patent/EP0984336B1/en not_active Expired - Lifetime
- 1998-09-08 DE DE1998600473 patent/DE69800473T2/en not_active Expired - Fee Related
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1999
- 1999-09-03 JP JP25012899A patent/JP2000085173A/en active Pending
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DE69800473T2 (en) | 2001-08-09 |
EP0984336A1 (en) | 2000-03-08 |
DE69800473D1 (en) | 2001-02-08 |
JP2000085173A (en) | 2000-03-28 |
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