DE1906208A1 - Device for fluid development - Google Patents

Description

Facility for fflüa sigkeita development

The invention relates to a. Arrangement for the development of fluids especially latent electrostatic images,

There are various development methods for electrostatic imaging "Faelsaimt. Such a procedure is urgent Fluid development. Here are on a picture surface existing electrostatic images by applying a dispersion ^ finely divided pigment or toner the picture surface develops. During development, the toner is electrostatically separated from the carrier liquid and on the image surface in an image-wise distribution; held. The liquid development of electrostatic images is described in many publications, for example in U.S. Patent Nos. 3,053,688 and 3,084,043

Compared to the drought development, the "liquid development has a number of tortiles". 3an at most, dry methods are, for example, the ^ f onerteilohen electrostatically to the carrier gebunac Therefore, a minimum force effect is to be generated, in an attraction of the

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Toner particles cause the electrostatic image. This threshold value of the minimum power twirkung; is at the liquid Development not required, as the toner particles are free are suspended. Another benefit of fluid development is that very tiny toner particles easily can be suspended in the carrier liquid while they are more difficult to handle and distribute when dry. ,

With these and other Yoarfeeil © it is possible to achieve a higher oil resolution with liquid developer materials than with dry developer materials. In practice, however. -er « _: . also found the liquid BitwiekXaratoff. ©. not ala di ©. = ideal solution «in particular ■ seigt® © s - see that when-routing- ■■■ one with a latent image ⁱⁱ ®®2 ^> see © n @ a B-iläfläeh © with; a · liquid

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electrostatieohea image »■■ ·; / - ■:. ■ ·; . ■ _"·.:.:.

The task of the invention lsestsM "

ment, latent electrostatic? "

This is a task that is solved for a Mffi ^ iehtuag afar

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Setol © containing a developing agent

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Reservoir is fed via a line that is connected to a Connected to the pump »the pressure of which is measured in such a way that a wave motion acting on a latent image close to it is generated on the surface of the developer material» This development unit is in contact with the development of a latent electrostatic image with a developer wave that is generated with a movement of developer material, which leads to the uniform suspension of the Developing agent particles suffice, but does not interfere with the electrical properties of the latent image. Thus surrendered high quality images. Through this quality improvement of the liquid kaita development as well as its control is " the development device according to the invention is particularly suitable for the development of multicolored images.

A better understanding of “supernatural adolescents and advantages the invention results from the following detailed description on the basis of the figures · They show: ι

Fig. 1 is a perspective view of the invention

Development facility, Pig «2 a side son of the inventive Eatwioklunge-

facility « ^!

Fig. 3 the section 3-3 from Hg. 2 and ί Pig. 4 a schematic sectional view of a picture structure

supply device for multicolor images with _:

food development device according to the invention works

In FIGS. 1 to 3, a tank or container 10 is shown which contains a supply of liquid adhesive 12. This adhesive 12 consists of a carrier liquid with a high specific electrical resistance with β.B. ^; 10 ¹⁵ ohms on and pigment particles which form a dispersion in the carrier liquid. Ee kftcn iedtr suitable liquid Eatwickeretof £ can be used. Typically similar associations

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Ratios are described in U.S. Patents 2,890,174, 2 891 911 ₉ 2 899 335, 2907674 and 3301675.

In the lower part of the tank 10, a number of lines 15 are provided, which are connected to an air pump 17. The lines 15 are provided with numerous small bores 19, the diameter of which is so small that the developer liquid 12 normally has no surface tension effect; can overcome through them, however, by the action of the air pump 17, air continuously enters through the bores 13 into the developer liquid 12 within the tank 10. This results in the formation of bubbles, which causes the developer material to continuously expand, so that the pigment or toner particles remain in a uniform dispersion throughout the developer material. This disorder is very desirable, since the pigment particles then retain their electrical charge suitable for good quality development.

A line 21, which is connected to a pump 23, is connected to the tank 10. This feeds the developer material from the tank 10 into a distributor pipe 25 which is arranged in a developer tray 27. This is also filled with developer material. A row of narrow openings 31 extends over the entire length of the distributor pipe 25, which is arranged in the middle of the shell and across the entire length. Width of a latent electrostatic image that develops. that runs. The openings 31 preferably have a size of the above. 0.025 mm, to about 1.3, and their spacing is approximately 1.2 to approximately "6 _r £ 3 mm.

The developer material 12 emerges from the openings 31 of the manifold 25 is on the surface of in the Shell 27 contained developer material generates a wave. This leaves you with an electrostatic, latent image

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provided image carrier 35 with its wave peak. The image carrier 35 is covered with a layer of photoconductive insulating material provided and can, for example, be produced in the manner described in the above-mentioned patents » The charged areas of the image attract the pigment or dye particles of the liquid developer 12, while the uncharged parts of the surface through the developer are not influenced. It should be noted that the liquid Developer StDff flows over the upper edge of the tray 27 and in the large developer substance supply in tank 10, where it falls can be brought into circulation again in the manner described

It should be noted that the on the surface of the developer wave generated in shell 27 generates such a movement, that a uniform dispersion of the toner particles in the carrier liquid takes place «In spite of this, the movement is so slight that the electrical properties are reduced by the resulting flow of the charge pattern are not impaired. The liquid is pumped out evenly from the distributor pipe 25, and that regardless of the liquid level in the tank XO, as long as the inlet opening of the pump 23 is covered by developer material ". Furthermore, the capacities of the Pump 23 and the distributor pipe 27 are dimensioned relative to one another in such a way that that its controllable and gentle wave on the surface of the developer in. The shell 27 is generated. To the optimal The power of the drive motor 29 in its turning room can be variable in order to develop an image in each case enable required special flow conditions au. There was also an electromagnetically operated valve be provided for flow regulation. It should be noted that the height is generated wave from the viscosity of the liquid , the pressure of the liquid and the spacing and size of the openings 31 in the manifold depends. Instead of the openings can also be provided with a slot in the distributor pipe be.

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After the electrostatic latent image after its movement through, the developer material oyelle the development has left, excess Eatwä oil becomes wiped off in a suitable way * for example with a Air flow or through Qiiet very ollen, which consist of a suitable elastic material, so that a for the removal of the Excess! liquid sufficient bridge can be generated can"

To replace the pigment or toner particles used up during development, a toner input device (not shown) is provided _f . which enters the constant m regular intervals into the developing agent liquid "Such devices are known ₉ They can be regulated with a control device in such a way that their ...

From the above description it can be seen that through the gentle combination of the electrostatic latent image with the development of a high quality, the electrical properties of the electrical properties are achieved. education picture to disturb an *! By the continuous © circulation .- / of the Eatwicklerstoff @ s and. Due to the MaaenMldung of the Yorratsmeng® the liquid in the wave ko] atiiHai®rliek era © u @ rt and Metet continuously, a © maxi »*. ■""■. mal® eating strength © »~ Bah © r is rolling. the. During the entire lifetime of the development fluid, no variation in the speed of the electrostatic latent image in the sense of a constant development time is required.

The suitability of the development line according to the invention for multiple development has already been mentioned. .The. Generation of multicolored images with an inventive development direction is based on the Mg, 4 b © wrote © n _? the © ine Mlderzeugiangsvorriohtung shows. An endless flexible

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Image plate 50, which consists of a photoconductive layer on a flexible conductive base, is moved continuously over guide rollers. One of these rollers is rotated by the drive motor HI. While the image plate 50 is being conveyed, a uniform electrostatic charge is first applied to its surface with the corona charging device 52. As the charged tape moves further, an exposure is carried out with a light image which is generated with the flash lamps 53 as an image reflected from a document 54 arranged on a glass plate 55 aligned, the projected image on the charged image plate, thereby forming an electrostatic latent image results in "At one point of the optical path is a filter plate _r 58 is arranged a number of filter contains 59 respectively different Sarbe" These colors are, for example, cyan, Gell) and Magenta. The filter 59 can be adjusted by rotation of the filter plate 58 with the motor M-2 x the flash duration of the lamps 53 and the operation of the ^M ators M-2 are controlled by the signal of a force acting on a photocell 61 lamp 60, in the movement area of the plate 50 are arranged and evaluate one or more markings on the tape, whereby the alignment of the images takes place.

Seeding the exposure of the picture tape 50, the development takes place of the generated electrostatic latent image »At the · Several development units 65 "are provided for the development center * which develop a latent electrostatic image through the generation of waves described. Each development unit contains a different colored pigment, so that a development of the oyan, yellow, magenta and black image. The development unit 65 are actuated by a logic control circuit 70 with which the color to be developed is determined »Di © · required data meow by hand or auto-

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can be entered automatically. It should be noted; that the Development of death advantageous in the same. Order like that The filter 59 should be switched on «As already mentioned the actuation of a development unit takes place fairly fast and only requires the actuation of the motor drive. whereby the developing liquid to generate the development shaft © starts moving. This shows $ that this type of development is particularly suitable for the image generation is very beneficial. Each developing unit is provided with a wiper 72 that applies compressed air the developed image conducts and excess development fluid distant

After the development, the developed image is transferred to an image carrier 80 which moves synchronously with the moving image belt 50. The transmission takes place with a corona Eatladungseinrichtung 81 "The image carrier 80 is provided with a paper transport 82 on a rotating _drum: 84 placed on it is attached represents a suitable device with Befestigwngs.". The image transferred to the image carrier 80 is fixed with a fixing device 86. After the image transfer, the liquid developing agent still present on the image tape is removed with a cleaning device 88. ^ V-- \ "[ - ■ ..": -. ": -.

It can be seen that the projection, the development and the processing of a second and subsequent images are carried out at a similar price and fixation exist, after which the image carrier 80 is removed from the cover 84, the result is an iSrbiges image corresponding to the original image 54. Once the image carrier 80 is read from the drum 84, it is brewed on an Oiransporf tape 90 through the outlet tray 92 ..

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By appropriate selection of the filter and the developing toner of the liquid developing agent, it is possible to produce multicolored images using a two-color process, a three-color process or a multi-color process. ISa to keep the distance between successive images to a minimum; a control system is provided, which in a known manner by one or more markings. the image belt 50 is actuated and the exposure is programmed at the exposure point. This operating mode makes it possible to generate images with a width that corresponds to the image plate and a length that can correspond at most to the length of the tape. The proportion of unexposed tape surrounding the images is kept to a minimum. Furthermore, it is possible to generate only a two-color image, even if the image area is moved through all development units. This is achieved, for example, by switching off the unused development units by switching off their motor drive, which drives the developer pumps _? be shut down. As a result, no development wave is generated, so that no development can take place. Furthermore, an electromagnetically operated valve can also be provided for switching a development unit on or off.

It should be noted that the multicolor developing device described works without a large number of printing plates of the previously customary multicolor image generation. Since the Coloration by the color filters and by the colors of the toners in the developing agents, is an image formation possible with any original image, regardless of whether it is a negative or positive image or transparent or opaque is. Another part of the goal is that an image generation on normal paper as in black-and-white printing mi% -. I · Since the development device according to the invention is automatic can be operated, it is very easy to operate » because only the original picture is brought into the correct position

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must be like this "feei d © r normal monochromatic electrostatic Imaging is the case. Then look around too a simple construction, the Eatwiekl strap can be used can be manufactured at a low cost. Thus results see a development facility suitable for multi-party touchscreen, which are effective for the most varied of cases are used kaxm.

The invention was based on an example of a guide, but is not limited to this, all im lame the following claims possible WeiterMldxingen or other embodiment © EL · will torch the basic idea of the Invention includes.

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Claims (7)

Patent a η s P r ü. ο h e 1. Establishment of fluid development, especially latent electrostatic images, characterized by a storage container (10) for liquid developer (12), üiaer the shell containing a developer (12) (27) is arranged, and through a nozzle arrangement (25) under the developer material surface present in the tray (27), the one developer flow in the direction the surface of the developer material is generated from the storage container (IQ) is fed via a line (21) which is connected to a pump (23), the pressure of which is such is dimensioned that on the developer surface a a wave motion acting on an image (35) arranged close to it is produced. 2. Device according to claim 1, characterized in that the container (10) is assigned a device (15 ₁ 17) for introducing a pressurized gas into the developer material (12) present in the container (10), whereby a uniform suspension of the developer particles in the developing liquid is maintained 3. Device according to claims 1 or 2, characterized in that that the nozzle arrangement (25) consists of a cross over the to be developed Image (35) extending distributor pipe (25) is made, which is provided with a number of openings (31). 4-. Device according to one of Claims 1 to 3, characterized in that that the storage container (10) is provided with walls which surround the shell (27) in such a way that from the shell (27) emerging developer material (12) into the Reservoir (10) falls. ' 909 836/13 33 5. A device for the development of Farbaus trains a multicolor original image in 3Porm latent electrostatic images using one or more of one of claims 1 to 4 formed Entwioklungseinrichtungen, characterized in that the range of movement of the electrostatic latent images containing the image carrier (50) developing means (65 ) are arranged, the number of which corresponds to the number of different types of separation colors and each contain a developer material colored accordingly to an separation color, and that a control device (70) is provided which switches the development devices (65) so effectively at predetermined intervals that the color separation © when the image carrier (50) is fed to the developing devices (65) can be developed with the correct color in each case. 6. A method for developing color separations of a multicolored original image using a developing device designed according to claim 5 »characterized in that the latent images corresponding to the color separations on their image carrier '(50) are passed to developing devices (65), the number of which is the number of different types of separation colors which each contain a bucket of extract color appropriately colored Eatwicklerstoff and. are switched so effectively "that each color separation is developed with the corresponding color _f and that the developed color separations are transferred in superposition to an image sheet (80) * -'-- 7. The method according to claim 6, characterized in that the image carrier (50) is returned to its starting position to repeat the above-mentioned process steps 9098367 1333 L e r s e i t e