DE2059189A1 - Facility for the development of electrophotographic multicolor extracts - Google Patents

Description

Dresden, on November 16 1970

Li / Kow.

Device for developing electrophotography Multi-color trains

The invention relates to a device for developing latent multicolor electrophotographic separations.

In known devices of this type aind along the direction of movement several developing devices of the photoconductive support, each containing a toner base color, arranged side by side. The developed individual parbene images are then sequentially removed from the photoconductive support transferred directly or indirectly to an imaging sheet.

With facilities of this type, the distance between the individual developing devices, and the downstream transmission station very different, so that Kaakaden- and .Lüssigkeitsentwicklungen only with unsatisfactory results have it carried out.

The purpose of the invention is to eliminate this disadvantage.

The object of the invention is to provide a device for developing electrophotographic multicolor trains, which is equally applicable to all known development processes and regardless of which development process In spite of justifiable effort, all developer base colors have the same exposure time to the latent ones Parbaua trains guaranteed.

According to the invention, this object is achieved in that several development units for one toner base color each into one Assemblies are summarized, which according to the respective

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to be developed latent color separations compared to the electrophotographic Layer support is movable in different work positions. The developing units are preferable Star-shaped and rotatably arranged on a shaft that can be pivoted or displaced with respect to the layer carrier. The development units can be used as containers closed outside of the working position to accommodate cascade developer be trained. In this case, the development units are to be equipped with a openable developer reservoir and an open collecting tray for the developer trickling down from the layer support as well as the developer reservoir and the collecting tray

Il connecting return shaft provided. In the return shaft a backstop that opens or closes depending on the position of the developer unit is arranged. The opening of the drip tray of a developer unit is from reaching the working position of the development unit and that of the developer reservoir is dependent on the presence of a latent dye additive on the substrate. The closure the developer reservoir as well as the collecting tray of a development unit takes place automatically during the exchange by the subsequent development unit. Instead of such development units set up for cascade development The latter can also be used as a tanka for receiving and delivering others Be trained dry or wet developer. In

In the latter case, the developing units are provided with self-closing capillary openings for the exit of the wet developer, which rest against the electrophotographic layer support in the working position. The development units can, however, also be provided with outlet openings for the hate developer that can be opened by the moving electrophotographic layer support.

With the device according to the invention 3οmit is independent depending on whether dry or liquid development takes place, a development to the same extent for all latent color separations ^ o— ensures, so that with justifiable expense a loyal loyal The process to be copied is reproduced.

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The invention is illustrated below with the aid of exemplary embodiments explained in more detail:

Show it!

Fig. 1 Development assembly for cascade development Pig. 2 development unit in sectional representation

Fig. 3 Another embodiment of a development unit for cascade development

Fig. 4 Development assembly for wet development.

According to Fig.1, development units 1, 2 and 3 are each for one Toner base color combined into a star-shaped assembly and rotatably mounted on an axis 4 in the direction of the arrow. The axis 4 is in turn attached to a lever 5, which can be pivoted about a pin 6 relative to a selenium drum 7. Each of the development units designed for cascade development is provided with a developer reservoir 8 and 8, as shown in FIG a collecting tray 9 is provided, which has a return chute are connected to each other when the backstop 11 is open. The backstop is loaded with a weight 12. The developer reservoir can be closed with a flap 13 and the drip tray with a flap 14, the former via a Lever 15 electromagnetically and the latter is actuated when starting up against a stop 16 fixed to the device. According to Pig · 3 is only the developer reservoir 8 of the developer unit can be closed by means of the flap 13, while the collecting tray is always open iet. This version of the development unit is possible if the same is exchanged for another in Direction of arrow is rotated. The backstop in the always open Return shaft 10 is formed by a nose 17. The wet developing device 4 consists of elongated tanks 18, 19 and 20, which are arranged on an axis 21 and are rotatable with respect to a band-shaped layer carrier 22. Each of the tanks is -with a capillary opening 23 for the Exit of the different colored wet developers · 24.25 »26 provided. Marked with £ 7 iat transfer paper or the like,

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with 28 a pressure roller and with 29 a transfer station (see Fig. 1).

The i3t mode of action is as follows

If the first latent color separation of a multicolored original appears on the selenium drum 7, the flap 13 of the developing unit 1 is actuated by means of a magnet, not shown, so that the cascade developer exit the developer reservoir and the first partial color image is on the selenium drum 7 can generate. The unneeded developer trickling down from the selenium drum arrives in the open collecting tray 9. In a schematically illustrated transfer station 29, the color

fc excerpt transferred to paper or the like and further processed in a known manner. After cleaning the drum 7, the same is exposed to the next color separation. At the same time, the lever 5 is swung ao far away from the selenium drum 7 so that the developer assembly can be rotated in the direction of the arrow until the next developer unit 2 is in the same working position that was previously occupied by the development unit ί at the same time the flaps 13, 14 of the developing unit 1 are closed. When the developer assembly is rotated by 120 °, part of the developer falls back into the developer reservoir 8 via the return duct 10 and the now open return stop 11. While the rotated developer assembly is back to the

"Selenium drum 7 is pivoted, the flap opens the developer unit 2. The flap 13 is only then opened when the second latent color separation is produced on the selenium drum 7. The following process for the developer is identical to that for the erate color image. The developer assembly is again used to develop a third latent color separation swiveled away from the selenium drum, rotated and swiveled in again. The developer slips into developer station 2 partly through the return, 10 shoots into the undeveloper reservoir return. At the same time, when rotating, the one still in the collecting tray 9 and in the return chute 6 of the winding unit returns 1 remaining developer in duu developer reservoir 8 back and the backstop 11 is

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This means that after the third latent color separation has been developed, the first developer base color is available again for a further color image. Each of the three developing units is located in working position in the same position for selenium drum, so that for all the toner colors to the transfer station ^29: results and a development path of the same length are thus excluded color distortions. Add to this that despite using the cascade development, the previously known complicated bagger similar facilities in the inventive development unit of FIG _t2 can be rotated clockwise and counterclockwise, the simplified development unit is shown in Fig, 3 rotatable in the arrow direction.

In the case of the development device according to FIG. 4, too, there is between each tank in the working position and the Image transfer effecting pinch roller 28 is a development path same length. In this case, developer liquid of the corresponding basic color occurs only when the layer carrier 22 is moved from the capillary opening 23, so that special measures to close the over the broad side of the substrate 22 long tanks are unnecessary. As soon as the first latent duck color separation is developed and transferred to the paper 27 the tank 19 or 20 by rotating the development assembly in brought into working position in one direction or the other and thus developed the second latent color separation. Corresponding will proceed for the purpose of developing the third color separation. A pivoting of the development assembly to adjust theB individual Faicbag units in working position is not here necessary. To guarantee that there is always a sufficient quantity to developer comes out of the tanks, e.g. when using Color pastes, the tanks can be used instead of the capillary opening 23 be provided with a larger opening which is closed in the rest position by means of an elastic tongue. The latter will only opened by the moving layer carrier 22.

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Claims (9)

Fat entana claims : Device for the development of electrophotographic multicolor separations, characterized in that several development units (1; 2; 3 ^ 18; 19; 20) each for a toner base color are combined to form an assembly which, according to the latent color separations to be developed, is compared to the electrophotographic layer carrier (Ii 22 ) can be moved into different working positions. 2. Device according to claim 1, characterized in that the development units are stern-shaped and rotatable one that can be pivoted or displaced with respect to the layer support Axis (4) are arranged. 3. Device according to claim 1, characterized in that the development units as outside of the working position closed containers are designed to hold Kaekadenen twickler. 4. Device according to claim 3, characterized in that the development units with one in the working position übeE the layer support lying, openable developer reservoir (8) and an open collecting tray (9) for the developer trickling down from the support as well as the developer reservoir and the drip tray connecting return shaft (10) provided 3ind. 5. Device according to claim 4, characterized in that in the return shaft an aich depending on the Position of the development unit opening or closing backstop (11) is arranged. BAD ORIGINAL -7- 209817/1231 6. Device according to claims 1 to 4 _}, characterized in that the opening of the collecting tray (9) of a development unit depends on the reaching of the working position of the development unit and the opening of the developer (8) depends on the presence of a latent color separation on the support is. 7. Device according to claim 1, characterized in that the development units are rotatable on an axis (21) arranged assembly as tanks (I8; i9i20) for receiving are trained by IT engineers. 8. Einricht ung according to claim 7, characterized in that the development units with in the working position on the electrophotographic support (.22) aelbat-closing capillary openings (23) for the Auat rode of the NASA developer are provided, 9. Device according to claim 7, characterized in that the developing units with by the moving electrophotographic Layer support aind to open outlet openings for the hate developer. ELBE-KAMERA-GESELIiSOHAPT with limited liability BATH ORIGINAL 209817/1231