DE2047894A1 - Electrostatic wet toner device - Google Patents

Description

Electrostatic wet toner device

The invention is concerned with electrostatic wet copiers and particularly relates to a liquid developer toner device for such devices.

When using known electrostatic wet toner devices the copies obtained often have undesirable stains or other surface defects as they pass through the developing device unfilled image areas arise "

The invention is based on the task of providing one with a flüs- ™ to create a working toner device with a strong developer that provides copies free of stains or other surface defects, has high performance in practical operation, is simple in construction and can be easily maintained in a condition suitable for making perfect copies.

This task is performed with an electrostatic wet clay cleaning device for the development of a sheet bearing a latent image

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or web-shaped, sensitized copying material in a liquid Developer solution achieved according to the invention in that curved upper and lower UJannen are provided, which under formation a curved guideway for the one moving from the front inlet to the rear outlet of the guideway Copy material are arranged at a distance one above the other, so that the upper UJanne on its underside is intensifying the metal surface that serves to develop the picture carries and in its Front wall has a horizontal row of openings that a conveyor is provided which continuously fills the front part of the upper trough with developer so that this directly through the openings in the inlet area of the guideway above the one facing with the layer side upwards under the ffletallflache continuous copy material Cascading flows, and that the rear wall of the lower tub with a horizontal row of slots for drainage is provided of excess developer in the outlet area of the guideway. The through the openings in the wall of the upper UJanne liquid toner solution cascading down through it hits the copy facing up, pushing the copy down and away from the metallic underside the top tub, resulting in a clean copy that is free of stains or other surface imperfections. The direction of flow of the liquid toner solution is within the guideway the same as the direction of movement of the copy. While the copy through the toner solution in the immediate vicinity towards the purple metal surface on the underside of the upper tub

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between the image areas of the copy and the Hiletallflache generated reinforced lines of force, which for it ensure that the image areas on the copy are well filled.

The invention is described below on the basis of an exemplary embodiment explained in more detail in conjunction with the accompanying drawing. The single figure shows a schematic perspective View of an electrostatic wet toner device constructed in accordance with the invention.

As illustrated, an elongated box-like one Storage container 10 for the liquid toner solution 12 is provided. The storage container 10 has a relatively large front Shell 14 and a somewhat smaller rear shell 16, which is below a front pair of Ulalzen 18,20 and a rear Squeeze roller pair 22,22 'are arranged. A clear toner solution (Isopar G) stored in the tray 14 is turned on prevented from mixing with the toner solution 12. The solution is withdrawn from the tray 14 by means of a pump 25.

In the upper part of the storage container 10 is a downwardly curved one Mounted lower pan 26, in the rear edge of which a horizontal row of slots 28 is formed through the liquid through it from the UJanns 26 into the rear shell 16 overflows, thereby maintaining the surface 30 of the liquid at a desired level. To the storage container 10 is a substantially similar one above the lower pan 26

shaped curved upper u / anne 32 attached. A wall 34 is divided the upper cover 32 into a larger front part 36 to take up a supply of the liquid toner solution and a Ιβθγβπ rear part 38. Toner solution 12 uiird by means of a pump 37 is constantly conveyed from the storage container 10 to the part 36 of the tub 32 and runs over a horizontal row from rectangular openings 40 in the front wall of the upper channel 32.

The underside 42 of the upper Uianne 32 consists of either one metallized plastic or a metallic component to provide image enhancement; she lies at a distance from the lower trough 26 and thereby forms a space 44 curved upwards and downwards or a guide track for the not Illustrated copy paper that goes in and out on the front exits at the rear, u / ie this through the thick arrows 46 and 48 is indicated. The space 44 also contains the liquid toner solution, which in operation of the device in the flows in the same direction in which the copy is moving.

In operation, a pre-wetting solution is drawn from the tray 14 fed from a spray tube 24 and sprayed by this directly onto the wire-wound roller 18 underneath. The non-illustrated copy runs with the layer side up towards the drive roller 20 and the metering roller 18 and is thereby moistened and squeezed. The copy then immediately enters the space 44 filled with toner.

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A slide made of metallized plastic or a metallic component underside 42 of the upper trough 32 ensures an image intensification. When the copy paper bearing the electrostatic latent image is passed through the liquid toner solution in the immediate vicinity of the upper trough 32, intensified lines of force are formed between the image areas of the copy and the metallic underside 42. The field reinforcement ensures that the image areas on the copy are well filled. Λ

Toner solution 12 is from the reservoir 10 from in the Part 36 of the upper tub 32 is pumped. The solution then cascades through openings 40 and falls onto the layer side up copy, causing it down and away from the bottom 42 of the top Tub 32 is pressed. This results in a clean copy that has no stains or other surface defects. The copy continues along the bottom of the curved space 44 until it exits between the nip rollers 22 and 22 '. ™

Squeezed toner solution is caught in the rear tray 16 and returned to the toner supply container 10. The overflow slots 28 allow a return of excess Toner solution via the rear tray 16 to the reservoir 10 after the toner solution has passed the curved space 44 in the same direction as the copy paper has flowed through.

Claims (1)

Expectations , j Electrostatic wet toner in a direction for developing, resulting in sheet or web-shaped, sensitized copying material bearing a latent image in a liquid developer solution, characterized in that curved upper and lower tubes (32, 26) are provided which form a curved Guideway for the copy material moving from the inlet in front to the outlet in the back of the guideway are arranged at a distance one above the other, so that the upper trough (32) on its underside (42) carries a metallic surface which serves to intensify the image development and in its foreground a horizontal row of openings (40) has that a conveyor (37) is present which continuously fills the front part (36) of the upper tub (32) with developer in such a way that it passes through the openings (40) in the inlet region of the guide track above the with the layer side facing upwards and running through directly below the metal surface iermater IALS constantly flows in cascade, and that the rear wall of the lower tray (26) having a horizontal ihe R _B is provided by slots (28) for draining excess developer in the AuslaGbereich the guideway. 10/17 8 5 2c Electrostatic NaGtonerainaineinrichtung according to claim 1, characterized by a device (18, 20, 24) for pre-moistening of the copy material before entering the guideway. Electrostatic wet tone device according to claim 1 or claim 2, characterized in that immediately below the an elongated rectangular box-shaped developer reservoir (10) is arranged in the lower pan (26), j which has a rear tray (16) for receiving the excess developer, which passes through the slots (28) in the Edge of the rear wall of the lower tub (26) flows out. 4 "Electrostatic wet toner device according to claims 2 and 3, characterized in that the storage container (10) has a has front tray (14), above which the urea humidifying device (18,20,24) is arranged and the excess U-humidifying agent catches * 5 »Electrostatic Naßtonereinrichtung nsch claim 4, characterized in that the Uorbefeuchtungseinrichtung has two coming with the copy material in drive connection Ualzen (18,20), one of which is wound with wire, ü-ri above the wire-wound roll (18) a spray tube (24) is arranged and that a device (25) is present which pumps developer from the storage container (10) to the spray tube. It oi: -B- 6 .. Electrostatic wet toner device according to one of the claims 2 to 5, characterized in that above the outlet of the guide track two with the copy material in Drive connection coming nip rollers (22,22 ') like this are arranged that squeezed excess Entuiickler fell into the rear shell (16) 7. Electrostatic wet toner device according to one of the preceding Claims, characterized in that the underside (42) of the upper tub (32) and the top the lower tub (26) are arcuately curved and in the are essentially concentric with one another. 8. Electrostatic wet toner device according to one of the preceding Claims, characterized in that the high-metal surface present on the underside (42) of the upper trough (32) is electrically charged. 9. Electrostatic wet toner device according to one of the preceding Claims, characterized in that the slits (28) of the lower tub (26) are above the liquid level lie in the upper trough (32). ^{1 (1} ■ '''·' «5