DE2055780A1 - Electrode arrangement for a copier using the photoelectrophoretic imaging method - Google Patents

Description

Patent attorneys Dipl.-Ing. F ^ eickmanii, 2055780

Dipl.-Ing. H. Weickmann, D1PL.-PHYS. Dr.K. Fincke Dipl.-Ing. EA.Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, POST BOX 860 820

MÖHLSTRASSE 22, CALL NUMBER 483921/22

<983921/22>

XEROX CORPORATION, Xerox Square, Rochester,! Γ.Υ. 14603,

V.St.Ao

Electrode arrangement for one after the photoelectrophoretic Imaging process working copier

The invention relates to an electrode arrangement for a copier _{e working according to the photoelectrophoretic imaging process}

U.S. Patents 3,384,488, 3,384,566, and 3,383,993 disclose a photoelectrophoretic imaging process known for the production of black and white or colored images · In this process, photoelectrophoretic particles migrate in an image-wise distribution on one or both of two electrodes, between which the particles are located in an image suspension. The particles are photosensitive and Obviously subject to a fluctuation of their charge polarity when interacting with one of the two electrodes when it is activated by an electromagnetic one Radiation. There are therefore no further photosensitive elements or substances required, so that a simple and cheap imaging process results. Mixtures of two or more different colored particles

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varieties allow the production of multicolored images that Particles of these mixtures can have overlapping or separate spectral sensitivity ranges and are suitable for subtractive color processes. The particles migrate under the influence of an electrical pressure one of the electrodes continues when it is hit by light energy of a wavelength opposite that of the colored ones Particles are sensitive to light

One for the continuous execution of this image lengthways process 8 suitable copying machine is z “Bo from the US patent 3,427,242 known. Furthermore, a copying machine has already been proposed which can produce true-color copies of originals and produces documents. In order to be able to produce a particularly good image with this copier, a or multiple picture electrodes with the injecting electrode cooperate under suitable conditions of the fotoelectrophoretisohen imaging process. This cooperation must can be carried out automatically and precisely using suitable components.

The object of the invention is to provide a new electrode arrangement for the one according to the photoelectrophoretic imaging method working copying machine to provide necessary picture electrodes, with several picture electrodes to interact with the injecting electrode in only a single imaging zone.

Based on an electrode arrangement of the type mentioned at the outset, this object is achieved according to the invention by a first one that is movably mounted within a first tank and that moves along a predetermined path of movement Image electrode and by a second, which is movably mounted within a second tank arranged next to the first Picture electrode, which along a second predetermined movement

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trajectory is movable

In this new electrode arrangement created according to the invention each of two picture electrodes is located in a tank that is individually assigned to it, both tanks being movable so that one of the picture electrodes comes together enters the imaging zone with its associated tank, where they come into contact with the injecting electrode · According to a further development of the invention Both tanks can be arranged on a common slide, which both tanks together in a first Moves in the direction as well as an individual movement of each tank relative to the carriage ©

The invention is explained in more detail using an exemplary embodiment shown in the drawing.

Pigei eohematically a preferred embodiment of a photoelectrophoretic Copier,

2 shows a plan view of the electrode arrangement according to the invention, which has partially broken away to reveal hidden parts,

Figo3 shows a view along the line 3-3 of the Pig2,

Pig «4 is a side view of the electrode assembly in which verdeokte parts are shown in dashed lines,

Pig.5 is a side view of the electrode assembly from the other Page, with hidden parts also shown in dashed lines, and

Pig.6 a lifting mechanism for the picture electrode tanks in disassembled form

The invention is here based on a preferred embodiment explained that with other assemblies for automa-

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deep and continuous production of copies of one too reproducing the original. Nevertheless, the invention is not limited to such an exemplary embodiment, but can be used within the scope of the specified Claims are also carried out differently · So are other methods and also devices for implementation this method is conceivable, which always make use of the teaching of the present invention, even though they are a use other than the embodiment explained here · So here are e.g. different assemblies for execution specified functions, but any comparable assembly can replace the assemblies explained here, as long as it fulfills the same or a similar function as the assemblies shown here.

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A detailed description of the basics and how it works the photoelectrophoretic imaging process used in the automatic copier described here and the interaction of the elements in the image suspension contained, particles for generating an image is contained in the patent documents mentioned above The imaging method described there and used in the copying machine described here works with an electromagnetic one Radiation in an image-wise distribution compared to that of the individual photoelectrophoretic particles in the suspension are sensitive to light »The activating radiation and an electrical pad over the image suspension act within the imaging zone between two electrodes. One called "translucent, injecting electrode" Electrode designated is electrically biased positively with respect to a "picture electrode", which is connected to the picture substance suspension face each other in the imaging zone in between. The negatively charged particles in the suspension are therefore attracted to the positive injecting electrode. gene"

The injecting electrode has this name because it is believed to be electrical during the imaging process Charges injected into the activated photosensitive particles. The term "photosensitive" as used herein means Property of the particles to change their charge polarity after being attracted to the injecting electrode and under the influence of the electric field after exposure to an activating electromagnetic radiation from the Electrode to migrate »The term" suspension "is intended to be a System with solid particles, distributed in a solid, fluid

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natural or gaseous medium. The one with this one described embodiment of the invention has, as usual, suspended in a carrier liquid solid particles ,, The term "picture electrode" describes the electrode that covers the injecting electrode with the suspension in between and activated when it comes into contact with it photosensitive particles inadequate to cause their migration forcing charges from the picture electrode surface can deliver this; The "imaging zone" or the "imaging area" is the area between the two electrodes, in which photoelectrophoretically ^ particles occur.

The particles in the suspension are normally non-conductive if they are not hit by activating radiation of their spectral sensitivity. The negative particles come into contact with the injecting electrode or in its immediate vicinity and remain in this position under the influence of the electric field until they are exposed to an activating electromagnetic radiation. The particles near the surface of the injecting electrode are the the final image on its generating particle. If the particles are hit by radiation that activates them, they become conductive and create an electrical bond between mobile charge carriers. The negative charge carriers of these bonds are aligned with the positive injecting electrode and the positive charge carriers with the image electrode. The negative charge carriers close to the intermediate layer of particles and injecting electrode may travel the short distance between the Teilohen and the electrode surface and allow Teilohen positive residual charge zurücke By this Polaritätsweohsel the particles are repelled by the positive residual charge of the positively charged surface of the injecting electrode, and the negatively charged surface of the picture

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electrode attracted. That of an activating radiation Particles hit at a certain wavelength to which they are photosensitive, i.e. a wavelength such as which causes an electrical bond of charge carriers within the particles, move away from the injecting one Electrode to the picture electrode and leave only such Particles back, not of one for one polarity A sufficient amount of radiation of the appropriate wavelength has been changed.

Are all the particles used, therefore, light-sensitive to a certain or another wavelength and the The arrangement is exposed to a light image of this wavelength, so it forms a positive image on the surface the injecting electrode by removing particles originally bound to its surface, with only the unexposed ones Areas of particles left behind »The polarities of the arrangement can be reversed; still finds A picture can be provided with suspensions originally having a positive or negative charge Particles are used »

The image suspension can be one, two, three or more differently colored Contain types of particles that have different spectral sensitivities © For a single color Processes, the particles of the suspension can have and also produce any color, the spectral sensitivity being relatively unimportant as long as they are in one The range of the light spectrum that can be generated with a conventional exposure light source lies. In the case of multicolored procedures the particles can be selected so that particles of different colors also face different wavelengths are sensitive to light.

For photoelectrophoretic imaging are the following

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m β - "

Steps required, though not in the order listed:

(1) Migration of the particles under to the injecting electrode Influence of the electric field; (2) Generation of charge carriers within the particles when they are activated by eggs Radiation hit; (3) particle deposition on or near the surface of the injecting electrode; (4) Occurrence of the electrical bonding within the particles at the injecting electrode? (5) Charge exchange the particles with the injecting electrode? (6) electrophoretic ^ Migration to the image electrodej and (7) particle deposition on the image electrode, creating a positive Image remained on the injecting electrode

After formation of the image on the injecting electrode, it can be brought into contact with the image transfer means in contact which has a relation to the picture electrode opposite electrical charge polarity ₀ The injecting electrode will now be negatively biased with respect to the transfer means, the negative residual charge possessing particles them therefore of the attracted to positive transmission means., a carrier material between the transmitting means and the particle image taken, the particles reach the substrate material "this V / else can be generated on each carrier material is a photographically positive image _o

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In the copying machine shown in FIG Injecting electrode 1 has a translucent cylinder jacket part which is held in a housing 2 and which is rotates around a shaft 3 in the direction of the arrow. The injecting electrode 1 is made of optically transparent glass 4, that with a thin, optically transparent layer 5 made of tin oxide or another electrically conductive one Material is coated. A material which is particularly suitable for this electrode is known as ITESA glass from the Pittsburgh. Plate Glass Company available Me injectors Electrode 1 is designed as a cylinder jacket part which is arranged inside the metal housing 2

The copying machine shown in Pig _e 1 is shown in such a position where the injecting electrode is located in a predetermined orbit on the way to a cleaning station A at which a plurality of cleaning devices such as ZOB ₀ tapes 6, 7 and 8, the conductive Touch surface 5 of injecting electrode 1. On the other side of the injecting electrode are stationary lamps 9 »10 and 11, which are arranged opposite the belts 6, 7 and 8 within the machine frame. When it is switched on, flood light is sent through the translucent injecting electrode at its points of contact with the tapes. Each of the tapes is brought into contact with the injecting electrode 1 by one of the servomotors 12, 13 and 14. The servomotors press the tapes to clean the injecting electrode against their electrically conductive surface ₀

The next treatment station in the orbit of the injecting Electrode is an imaging station B. The first time the injecting electrode 1 passes the station B acts a first picture electrode 16 with the conductive one

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Surface 5 of the injecting electrode 1 together _o

At a scanning station G, an optical system projects a light image into the imaging zone of station B between electrodes 1 and 16 Lamp carriage 17, which swings back and forth in the direction of the arrow. An original 20 lies on an object surface 19 · The lamps 33 are shown in their scan start position and move during the movement of the injecting electronics trode 1 through the imaging zone of station B over the object surface 19 and project over suitable Mirrors 21, 22 and 23 as well as a lens optic 24 through the transparent electrode 1 through an image in the imaging station Be j

The picture electrode 16 designed as a roller rolls over the conductive surface 5 of the injecting electrode 1 and serves both to supply the Bildstoffsuspension to the injecting Electrode as well as for the imagewise distribution of the suspension between the injecting electrode surface 5 and the surface of the picture electrode 16.

The injecting electrode then rotates at a constant speed once through its entire orbit without cooperate with one of the treatment stations arranged along the orbit until they return to the imaging station B reached. By means of a servomotor 25, the picture electrode 16 has in the meantime been removed from the electrode 1 acting on it Lowered position together with a housing 26 carrying the picture electrode 16 »In addition, another Servomotor 27 a slide 28 in the horizontal direction, which takes the housing 26 carrying the picture electrode 16 with it. With the carriage 28, a second picture electrode 29 is moved together with a housing 30 holding it. A

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Servomotor 31 lifts the housing 30 and at the same time the second Bildelektro.de 29 in the imaging zone of station B. via an eccentric disk 32. The second picture electrode 29 rolls over surface 5 of injecting electrode 1 as it moves through the imaging station B moves. At the same time, the original 20 is on the specimen plate 19 by the lamps of the scanning station G lit again. The scanning movement is synchronized with the movement of the injecting electrode 1, so that a moving image is created congruent with the first projected image, which moves at the same speed as the electrode surface 5 moves in the imaging zone.

Subsequently, the injecting electrode 1 reaches a transfer station D, a transfer roller 40 comprises ο A in a reservoir 41 held sheet 44 the transfer material is conveyed out of the latter via a Saugtransport 42 to the Übertragungsroile 40th It is grasped by a gripping mechanism 43 located on the roller 40 and rotated towards the injecting electrode 1 which is just passing through the transfer station D. Before the sheet 44 touches the surface 5 of the injecting electrode 1, it is moistened with a liquid that promotes the transfer of the particles adhering to the surface 5. Moistening is effected by a moistening rod rotating in a supply of suitable fluid in the tank 46 . The transfer roller 40 rolls the sheet 44 over the surface 5 of the injecting electrode 1 under the action of a suitable electric field which transfers the particles forming an image on the injecting electrode to the sheet of transfer material. The sheet 44 is removed from the roll 40 by stripping fingers 47 and a release mechanism of the gripper mechanism.

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The imaging takes place in the imaging zone B between the contacting injecting electrode 1 and a Picture electrode instead. At this point of contact, the light-sensitive pigment particles are between the injecting Electrode and the picture electrode brought and an electric! Field and that of the optical imaging device G exposed to incoming light radiation

The picture electrode arrangement sits between two machine frame parts 100 and 101, see Fig. 2 to 5 · The assembly slides on two rails 102 and 103 made of nylon or rollers 104 and 105 made of another low coefficient of friction material attached to one of the assembly supporting carriages 28 are arranged to allow easy reciprocating movement on the rails 102 and 103. Further guide rollers 106 and 107 engage in rails of the base plate 108 of the copier and are also on the floor of the carriage 28 is attached to the movement of the carriage relative to the bottom plate and the injecting electrode 1 to facilitate.

The entire carriage 28 is moved back and forth by a servomotor 27, which is connected to the via a fork connection 109 Machine bottom plate 108 is connected. The end position of the servomotor 27 is set by an adjustable stop 111 set with a flange 112 of a carriage part 113 cooperates. The sidewalls 114 and 115 of the sole center 28 limit the electrode arrangement and carry the guide rollers 104 and 105 · Attached to the or integrated Components of the carriage 28 are a first and a second picture electrode tank 26 and 30.

Inside the first picture electrode tank 26, the picture electrode 16 is mounted on a jacket at both ends of the tank.

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heads 117 and 118 in side car 119 and 120 held shaft 116 attached. The first picture electrode tank is divided into two compartments. The first is the suspension supply department or the first picture electrode 16 and associated Meohanik for feeding and treating the suspension to this, on this receiving ₀ The tank is formed of a side and center wall 121 and 122 and a bottom plate 123rd The second compartment of the first picture electrode tank 26 is the upper compartment, which is open on one side and which accommodates various connections, motors and similar functional elements of the electrode arrangement.

A mechanism is provided in the suspension feed section of the tank, with which a layer of suspension is deposited on the first image electrode 16 is to be applied for the imaging process is required in the imaging zone. For this purpose, a suspension conveyor brush 125 is provided with which in the tank The image suspension is given to the image electrode 16 will. This brush 125 brings the suspension from the bottom of the tank 26 onto the surface of the first picture electrode 16 · Die Brush 125 is mounted on a shaft mounted in bearings within side walls 119 and 120 of first picture electrode tank 26 126 attached »

So that a smooth suspension layer covers the area of contact between the first picture electrode and the injecting electrode reached, a G-straightening rod, e.g. a wire-wound one Rod 127 is provided, which the picture electrode 16 is moved in contact therewith. The smoothing rod can be fluted, smooth, knurled or a different surface texture with whom an even thin Sue « Pension layer can be generated · The smoothing bar is of two bearing arms 128 and 129 on one extending between the arms into the side walls 119 and 120 of the image electrode tank 26 extending shaft 130 held · This

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Shaft 130 is preferably a hollow shaft that has one above the with the surface of the first picture electrode 16 cooperating smoothing rod applies uniformly distributed force to The hollow shaft runs in suitable bearings through the tank wall 119 and is there with a pressed onto it Crank arm 131 connected

After contact with the suspension supply roller 125 and the smoothing rod 127, the first picture electrode 16 acts in FIG their orbit next with a shear roller 134, the task of which is to apply a shear force to the liquid suspension layer exercise before the imaging takes place, as it has been found that some image suspensions produce better color images after applying such shear pressure. The shear roller 134 is made by the following The mechanism described is brought into and out of engagement with the first picture electrode 16 as required. The shear roller is on one over a bearing with a crank arm 137 and over a second bearing with a similar crank arm attached to the opposite side connected shaft 135. The hollow shaft 138 is also connected to the crank arm 137 tied together. However, the hollow shaft 138 is welded to the crank arm 137 so that it is the drive for pivoting the crank arm and thus represents the Soherrolle 134 in a position in contact with the first picture electrode. The hollow shaft 138 penetrates tank wall 120 within an Oilite camp so

On the outside of the tank wall 120, the shaft 138 is connected to a drive pulley 142 which is carried by a timing drive belt 143 is driven · The drive belt pulley 142 is separated from the hollow shaft 138 via a bearing that enables rapid rotation of the shear roller. A rotation of the hollow shaft 138 with respect to the drive jet shaft 142 is provided by one on the outer end of the shaft 138

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henen Buna prevented.

The shearing roller 134 is electrically biased with respect to the first picture electrode 16, to be able to exert even better shear effects ₀

Next, a knife edge bezel 150 is in orbit of the first picture electrode 16 arranged, the surface of which touched whenever it does not touch the injecting electrode 1. The knife edge screen 150 prevents the Image suspension from moving across the surface of the image electrode to be distributed if no image suspension is required ο The knife edge cover is on a crank arm 151 attached, which is oriented in the rest state that the aperture does not touch the first picture electrode. The crank arm 151 has two planes 152 and 153, the one with a hollow shaft 155 are connected, which in turn again the knife edge screen 150 evenly against the surface of the first picture electrode The hollow shaft 155 runs in suitable bearings through the side walls 119 and 120 of the first picture electrode tank 26 through onto a crank arm 156 which is fastened at one end and which rotates the hollow shaft 155. The knife edge cover With the help of this mechanism, 150 is in and out of contact with in the manner described below brought to the surface of the first picture electrode 16

The remaining compartment of the first picture electrode tank 26 takes on the motor 157 for the shear roller 134, which is attached to the base plate 123, via a gear 158 with which the Shear roller 134 is connected to rotating timing belt 143 "

The last one interacting with the surface of the first picture electrode 16 The component is an expression screen 159, which is shown in a Lagerblook 160 is held and unused suspension

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and scrape pigment particles from the first picture electrode 16 The bearing block 160 is connected to an eccentric shaft end 161 which is held in an actuating arm 162 istβ The actuating arm 162 is screwed through a thread in the Adjusted adjusting arm 162 guided adjusting screw 165 to a suitable contact pressure and is supported against a Stop 164 of the tank wall 119. A tension spring 165 holds the Actuating arm 162 in its correct position.

The surface 166 of the picture electrode 16 is made of a material

7 material that has an electrical resistance of 10 Ohm-cm or greater, which helps maintain suitable conditions for the electric field in the imaging zone is required. The surface 166 is therefore made of a barrier electrode material such as Tedlar, one of E.I. DuPont de Nemours & Co. available polyvinyl fluoride film, or formed from baryta paper.

The background 167 for the surface material 166 is a electrically conductive rubber-like material which, upon contact with the injecting electrode 1 in the imaging zone is deformable.

The same structure is shown by the second picture electrode 29, which also has a surface 168 of high electrical resistance and a deformable inner core 169. The second picture electrode 19 therefore has the outer coating 168 same barrier electrode material as the coating 166 of the first picture electrode 16. The second picture electrode is on one Shaft 170 is attached, which penetrates the side wall 171 on a jacket head 172 and the side wall 173 on a jacket head 174. Each of these the picture electrodes holding jacket heads is provided with bearings, so that the shafts and the Image electrodes can rotate freely in the jacket heads.

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The second picture electrode 29 has the task of unwanted Background particles from the on the injecting electrode Remove 1 formed image and add this »image altogether improve · However, it does not bring any further image suspension onto the injecting electrode 1 like the first one Image electrode makes "

So that the second picture electrode can optimally perform its task can, the use of a liquid similar to or even the same as the carrier liquid has to be used Coating the surface of the second picture electrode proved to be very advantageous. Brushes are used for this purpose 175 and 176 of the outer surface of the second picture electrode 29 liquid that settles on the bottom of the second picture electrodes - tanks 30 is located. A scraper screen 177 is from a bearing block 178 pressed against surface 168 to dispense the liquid to remove it again · This prevents contaminated liquid from reaching the imaging zone · Each of the tilting brushes 175 and 176 has a shaft 179 and 180 which penetrate the side walls of the second picture electrode tank 30 · Located on the bottom plate 181 of the tank 30 a bracket 182 for a motor 183, which the Heini ·· brushes 175 and 176 rotates

A tank wall 184 has a liquid outlet near it Top edge. The liquid required to coat the surface 168 of the second picture electrode 29 is passed through inside The entire width of the wall 184 extending slot 185 is output. This allows fresh liquid for the second picture electrode continuously supplied · The liquid is flowing via an inlet 187 shown in FIG. 4 to the slot 18 $ ·

During operation of the electrode arrangement, the carriage 28 Moved to and fro * underneath the injecting electrode 1

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Either the first picture electrode 16 or the second picture electrode 29 are thereby brought into a position in contact with the injecting electrode 1 in the imaging zone B, on which a light image of the original to be copied is projected · This is done by lifting either the first or the causes second picture electrode tanks with all associated components. As can be seen from the drawing, the Tanks moved by the servomotor 17 into a first position at which the first picture electrode is the injecting picture electrode touched. The first picture electrode tank 26 then turns off its lower rest position raised, which is caused by the servomotor 25, which has a fork connection with a fixed to a shaft 191 »which carries an eccentric disk 192, connected crank arm 190 is connected »

The first picture electrode tank 26, which is operated by the actuator 25 is moved in cooperation with the eccentric disk 192, Is also mounted on a second eccentric disk connected to a second shaft 193 for reasons of balance, which is also below the first picture electro * The tank is located. When the servomotor 25 is actuated, it rotates the shaft 191 via the crank arm 190 · In addition to lifting of the tank through the eccentric shaft 192 drives one over On the shaft 191 seated gear 195 driven chain 194 the shaft having the other eccentric disk 193 · This double shaft ·· and eccentric disk arrangement is particularly advantageous because the tank is so heavy! - · Ie, namely the first picture electrode 16 and its associated components, at one end and also heavy components, such as has the shear roller motor 157, on its other side. It is important to keep the tank properly balanced and in balance to prevent the liquids in the tank from sloshing and the proper position and location of the first. BlIcI- * Adhere to the electrode 16 opposite the injecting electrode

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to be able to *

The drive of the first tank is shown in disassembled form in FIG Duroh the eccentric disk 192 shown. A bracket 200 is welded or otherwise attached to the tank wall 119. The bracket engages in the sole center wall 114 via a pin 201 pressed into the bracket and a slot 202 cooperating with the latter. A pin 203 in the Ten wall 114, however, engages in a slot 204 of the bracket 200. An adjusting screw cap 205 provides the correct stop stood securely between the tank and the sled in its lower rest position. The working position is determined by the movement of the Servomotor 25 determines the eccentric 192 within of the bracket rotates, whereby the tank is raised relative to the base 28

The movement of the tank 30 takes place in the same way, with a servomotor 31 rotating a crank arm 210, which in turn an eccentric disk 211 there · This puts the tank 30 over a bracket-pin arrangement, which is designed similarly to the arrangement already described for the first picture electrode tank 26, relatively sum slide 28 pushed upwards.

The various cooperating with each of the picture electrodes Components can be moved and operated using pneumatic or hydraulic servomotors as well as electrical and / or mechanical devices so that they can be used in the function in the manner described in the embodiment shown.

The first picture electrode is at the start of operation of the copier 16 located below the imaging zone B ready for contact with the injecting electrode 1. · Moves the Injecting electrode 1 in the contact area of the image

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tion zone B, the servomotor 25 is operated, which the crank arm 190 takes along and rotates the eccentric disk shafts in such a position in which the first picture electrode tank 26 on the highest point of the eccentric disks sits «The entire tank moves up a certain distance and brings the first image electrode 16 into a position in contact with the injecting electrode surface is continuously fed to the surface 166 of the first picture electrode 16 and the smoothing rod leaves only one metered Amount of suspension for the Soher roll 134 »The smoothing rod 127 is by rotating the hollow shaft 130 on the crank arm 131 with the surface 166 of the first image electrode 16 brought into contact and held with a predetermined contact pressure by the spring 251 in this position.

The shear roller mechanism is actuated to move the shear roller with the suspension on the surface 166 of the first picture electrode 16 to bring into contact «The hollow shaft 138 of the shear roller 134 is held on the crank arm 252, which is over a fork connection is connected to a servomotor 254. When actuating the servomotor 254 this brings the shear roller 134 in contact with the first picture electrode 16 via the mentioned lever mechanism

The knife edge screen 150 becomes the surface 166 brought the picture electrode 16 touching position and the supplied and metered and exposed to a shear pressure Image material suspension arrives in the imaging zone B to there to be selectively deposited on the injecting electrode 1 in an imagewise distribution. The suspension that nioht too contributes to the image forming on the injecting electrode, which is moved by the latter, is made by the image electrode 16 and brought into contact with the print-out screen 159 held in the warehouse 160. »From this one is

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the suspension is removed from the surface 166 before new ones The suspension is fed to the picture electrode with the feed roller 125 will.

After the injecting electrode 1 has been moved through the imaging zone B, the servomotor 25 is switched off and the first picture electrode tank 26 is lowered again Servomotor 27 for the carriage 28 is switched on and the carriage with both picture electrode tanks 26 and 30 at the in the representation shown in Figures 2 and 3 moves near the right · The servomotor stops this movement when the second Picture electrode tank 30 has reached such a position that the second picture electrode 29 is immediately below the Imaging zone is ο

The injecting electrode 1 moves through the imaging zone again B, the second picture electrode tank 30 is activated by actuating the servomotor 31 and rotating the eccentric disk 211 moved upwards until it has reached its highest position on the eccentric disc. Before the second picture electrode 29 moved into the imaging zone, it was sprayed with a liquid similar to or equal to that The carrier liquid of the image suspension is · This facilitates the detachment of the from the on the injecting electrode 1 located picture to remove parts. Since the movement of the two electrodes 1 and 29 are under the same Imaging conditions as occurs during the contact on the first picture electrode 16, that on the injecting electrode surface 3 the image located is enhanced by removing the particles struck by activating light radiation, the one projected by the optical imaging device 0 Photo is given

When the second picture electrode 29 is rotated, its reversal

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The surface 168 is cleaned of any remaining suspension through the cleaning brushes 175 and 176. The surface is wiped clean and relatively dry by the push-out panel 177, which is held in a bearing 178. The contaminated liquid that has been removed from the surface 168 of the second picture electrode is removed from the second BiIdelektrodentank 30 by means not shown here EInriohtungen to be filtered or processed in other ways than through the spray means in the wall 184 to the second picture electrodes tank returned _e

After the injecting electrode 1 has moved through the imaging zone, the second picture electrode tank becomes 30 duroh shutdown of the servomotor 31 lowered into its rest position. The servomotor 27 is switched on again, see above that the sled with the tanks returns to its starting position is moved, from which a mapping process can be started again »

If the first picture electrode 16 is not in its imaging position, that is, with the servomotor 25 switched off, the knife edge screen 150 with the surface 166 of the first picture electrode 16 brought into contact. This is achieved by switching on a servomotor 255 that controls the Crank arm 156 moved to the right in Pig ^ 4.

The servomotors shown here can be hydraulic or pneumatic. matisoh work, or can use electrical ones, e.g. electromagnets, or mechanical components, e.g. nooks, are replaced that fulfill the specified functions,

The required electrical voltage is supplied via an electrical Connection 215 and contact brushes 216 supplied to the di · Touch shaft 116 of the first picture electrode · Die Span » Source itself is not shown, but should be sufficient

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be strong to voltages of 300 volts to 5000 volts on the surface of the image touching the injecting electrode 1 electrode generator can

The components arranged around the second picture electrode 29 do not engage and disengage from the second Brought picture electrode, nor are they dependent on the current status of an imaging cycle, like this some of the components associated with the first picture electrode. Both cleaning brushes 175 and 176 remain in constant contact with of the surface 168 of the second picture electrode- 29o The push-out aperture 177 exerts a permanent pressure on the surface 168 of the second picture electrode, which is caused by the setting the panel holder 178 is adjustable. The desired pressure is set by turning a crank arm 220 and Adjusting an adjusting screw 221 achieved, this position being maintained by a tension spring 222 »The Crank arm 220 is connected to the eccentric shaft 223 of the visor bracket 178. The shaft 179 of the cleaning brush 175 and the shaft 180 of the cleaning brush 176 are over bearings in both side walls of the second picture electrode tank 30 stored · An electrical voltage is applied to the shaft 170 of the second picture electrode 29 via an electrical connection 225 and contact brushes 226 applied.

The cleaning brushes are connected to a toothed wheel 230, a chain 231 and another toothed wheel 232, which is connected to the shaft 179 the cleaning brush 175 is connected, driven by a motor 183. With a coaxial to the gear 232 arranged Gear is connected to a chain 233 which is a gear 234 driving the shaft 180 of the other cleaning brush 176 rotates »A tension pulley 235 keeps the chain 233 on the sprockets»

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Both picture electrodes are driven by a common chain 240 from the main drive of the copier machine.This chain 240 drives a gear wheel 241 on the first picture electrode and a gear wheel 242 on the second picture electrode, so that the two picture electrodes rotate synchronously with the injecting electrode 1, when they come into contact with each other. A tensioning roller 243 fastened on an arm 244 prevents the chain 240 from jumping off the gears 242 and 241. Since the gears and the picture electrodes driven by them move relative to one another, this tensioning roller 243 is particularly suitable for moving the chain 240 over to have a sufficient number of teeth on the gears to prevent the chain from jumping off »

109821/1836

Claims (1)

Claims Electrode arrangement for one after, the fotoelectrophoretisohen Imaging process copying machine, characterized by one within a first tank (26) movably mounted first picture electrode moving along a first predetermined path of movement (16) and by a second tank (30) movably mounted within a second tank (30) arranged next to the first Picture electrode (29) which can be moved along a second predetermined movement path 2c electrode arrangement according to claim 1, characterized in that the first and the second tank (26, 30) in each case one of two possible positions is movable and that part of the first and second picture electrodes (16, 29) is movable in one of these two positions of the tanks (26, 30) along the predetermined path of movement, wherein the parts of the first and second picture electrodes (16, 29) are movable one after the other. 3β electrode arrangement according to claim 1 or 2, characterized in that that a base (28) carrying the first and second tanks (26, 30) is provided " 4 · Electrode arrangement according to claim 3 »characterized by a first drive (25) for moving the first tank (26) relative to the sole (28). 5ο electrode arrangement according to claim 4 or 5 »characterized by a second drive (31) for moving the second tank (30) relative to the base (28). 6 · Electrode arrangement according to claim 4 or 5 » marked 109821/1836 net duroh a third drive (27) for reciprocating movement the carriage (28) and the first and second tanks (26, 30). 7. Electrode arrangement according to Anspruoh 6, characterized by duroh a first, second and third drive (25, 31 »27) controlling control circuit with which the first and the second tank (26, 30) are movable so that the first and second picture electrodes (16, 29) are successively in a ~ correct position can be moved. 8. Electrode arrangement according to one of claims 4 to 7, characterized characterized in that the first drive (25) has at least one nook disk (192) and at least one Cam follower (200), which holds the first tank (26) on the cam plate (192), comprises that the cam follower (200) is coupled to the carriage (28) enabling a relative movement between the two and that one Power source (25) * to rotate the cam disk (192) and Relative movement of the first tank (26) with respect to the base (28) is provided » 9e electrode arrangement according to claim 8, characterized in that that the coupling between the cam follower (200) and sole slide (28) at least one pin (201, 203) and Has slot (202, 204) in which the pin (201, 203) is guided and duroh the direction of the first two Tank (26) and carriage (28) taking place relative movement can be determined. 10e electrode arrangement according to one of claims 5 to 9 » characterized in that the second drive (31) has at least one nook disk (211) and at least one Cam follower (300), the second tank (30) on the 109821/1836 The cam disk (211) has a relative movement between the cam follower (300) and the slide (28) is coupled between the two enabling and that a power source (31) for rotating the cam disk (211) and relative movement of the second tank (30) with respect to the slide (28) is provided 109821/1836 Blank page