DE1289430B - Device for multicolor reproduction - Google Patents

Description

The invention relates to a device for carrying out a method for the production of multicolored reproductions of multicolored originals on electrophotographic Ways.

It is known to make multicolored reproductions on electrophotographic Ways to generate by changing the image several times in succession through appropriate color filters broken down into partial color images, on a photoconductive layer as partial color charge image generated and developed and fixed by means of a toner corresponding to the partial color the partial images are superimposed on one another.

However, there is no known device with which this multitude can be performed by successive operations. It won't be a clue either given how the partial images are generated one after the other and by what means it is prevented that shifts occur when the partial images are superimposed.

The invention therefore aims to provide a solution to the problems mentioned admit. More precisely, it is the object of the invention to provide a device with which multicolored reproductions are produced by electrophotographic means can, without that partial color image shifts can occur, and the fast and works continuously.

According to the invention, the object is carried out with a device a method for producing multicolored reproductions of multicolored originals by electrophotographic means, in which a charged, photoconductive layer is exposed with a partial color image of the original, which is obtained by that the light coming from the original passes through an appropriate filter of a filter set passes through and the partial color charge image thus obtained with a corresponding colored toner is developed and then fixed and the process with all partial colors is repeated, achieved in that a rotatable drum for receiving an electrophotographic Recording material with a photoconductive layer, a charging device, an exposure device for line-by-line imaging of the original on the photoconductive Layer, each in monochromatic light corresponding to a partial color of the original, a development station with several development facilities each for one Partial color, a fixing device and a signal transmitter arranged on the drum and a stationary signal receiver, which in association with the process sequence individual devices one after the other for the individual partial color images put into action, brought into operative connection with one another.

This ensures that the partial color images exactly coincide and the production of copies takes place quickly and automatically.

It is possible to use a photoconductive layer as the photoconductive layer on the drum Paper, which is then the final image carrier, and the fuser to be arranged following the developer station.

But it can also be arranged a second drum, which an image receiving material carries and rolls at the same peripheral speed on the first drum, wherein the fixing device faces the outer surface of the second drum. Each Partial color toner image is then from the first drum with photoconductive layer, on which it is first developed, on the image receiving material on the second Transfer drum and fixed there. Although the device is a bit more complex, however, any image receiving material can be used.

In both cases, not only line art but also halftone originals can be reproduced when using exposure grids and the like.

The invention has the great advantage that the original is in faster Sequence is faithfully reproduced without partial color image shifts. what with the help of a signal transmitter and receiver. done that the moveable Put the optical system into operation and switch on the light source; th. As the colors determined by the colors of the filters and the toner colors of the developing devices a multicolor reproduction of any original can be made. Another major advantage of the invention is that a reproduction on ordinary paper or for ordinary black and white reproduction photoconductive paper is possible.

In the invention, the image receiving material is wrapped around a drum placed and attached to this, whereupon depending on the rotation of the drum exposure, development and fixing operations are repeatedly carried out, wherein the exposure then begins when a certain point on the drum Signal transmitter is aligned with a signal receiver, which is outside the drum on a specific point is arranged. Accordingly, the location of the image receiving material is Constantly fixed relative to the position of the original during the entire process, see above that special adjustments to maintain the fit of the partial images are not required are what has been a serious problem in common reproductive processes. As a result are also no special precautions and measures for local determination the template and the image receiving material required in the invention.

Since the device according to the invention after arranging the template to the - correct position as well as the known monochromatic, electrophotographic Reproduction systems can be operated fully automatically; is its operation extremely easy. Since the structure is simple, it can be done at a relatively low cost getting produced. The apparatus of the invention for making multicolor reproductions is therefore suitable for a wide range of applications.

In the description of exemplary embodiments that follows, the Invention explained in more detail with reference to the drawing. It shows A b b. 1 a schematic representation a multicolor reproduction device according to the invention in side view, partly in section, A b b. 2 the top view of a color filter set from the device according to A b b. 1 and A b b. 3 shows a representation like A b b. 1 of a modified embodiment.

In A b b. 1 shows an embodiment of a multicolor reproduction apparatus according to the invention, in which an original 1 to be reproduced, for example a document, a book or a photographic film, is held in such a position that it is illuminated by a light source 2. The light reflected from the original 1 is guided through a slot 3 and then directed in a certain direction - with the help of imaging systems 4 and 6, which consist of lenses, mirrors and other similar parts.

At one point in the optical path of this imaging system is one Filter plate 5 (shown in the drawing, for example, as a disk) arranged, which can be rotated by a drive device 5 a.

After passing through a slit 7, the light coming from the imaging system strikes an electrically grounded rotating drum 8 which is arranged at an optically defined point. Around this rotary drum 8 for receiving an electrophotographic recording material with a photoconductive layer around a feed 9 for supplying a recording material 10 with a photoconductive layer, for. B. a coated paper, on the surface of the drum 3, a device 11 for attaching or lifting the recording material 10 to or from the drum 8, a charger 12 for applying a uniform electrostatic charge to the photoconductive layer, a development station with several development devices 13, 14, 15 and 16, which produce the corresponding differently colored toner images with the aid of toner dispensers, a fixing device 17 for fixing a partial color toner image on the recording material and finally a signal receiver 18 a, which interacts with a signal transmitter 18 attached to the drum 8 . The signal generator 18 and the signal receiver 18a are designed so that when they assume a certain relative position to each other, they trigger an exposure of the recording material 10 located on the drum 8 with a partial color image of the original.

If necessary, the device described above can be set up in a darkroom. The filter disk 5 is, as shown in A b b. 2, provided with filters 51, 52, 53 and 54 of different colors and can be rotated controllably about its axis.

With the aid of the device described, a multicolor reproduction can be made in the following way: In order to obtain a projection of the original, the original 1 is scanned by the illumination by means of the light source 2, whereupon the light reflected from the original 1 successively through the slit 3, the imaging system 4, the filter 5, the imaging system 6 and the slot 7 and finally projected onto the recording material 10 located on the drum 8. In this way, the original is transferred line by line in partial color images corresponding to the partial colors of the original onto the photoconductive layer.

For this purpose, from the light source 2, the slot 3, the Imaging system 4 and, if necessary, the imaging system 6 existing exposure device be designed to be movable together with the scanning of the original 1 (hereinafter referred to as the movable optical system), which makes it possible during the The light reflected from the original 1 is always scanned through the slot 7 to pass through. The movement of the moving optical system is with rotation synchronized with the drum 8 which carries the recording material 10.

The recording material 10 is fed through the feeder 9 and, with the aid of the device 11, is placed on the drum 8 and fastened to it, the drum being at rest or rotating. The recording material 10 mounted on the drum is simultaneously charged by means of the charging device 12 while the drum 8 is rotating. When the drum 8 with the attached, charged recording material rotates, the signal transmitter 18 will reach a position opposite the signal receiver 18 a in which the movable optical system is put into operation and the light source is switched on and its movement begins. Accordingly, the original 1 is projected line by line through the slit 7 onto the surface of the recording material 10.

During this process, the filter disk 5 is in the rest position, and the light reflected from the original is passed through one of the filters, for example through the filter 51.

When, after a certain rotation of the drum 8, the exposure process with a partial color corresponding to the filter 51 is finished, a partial color development corresponding to this partial color exposure takes place on the recording material 10 with the aid of a corresponding development device 13. The other development devices are located during this process stage 14, 15 and 16 out of order.

When the partial color toner image produced in this way at the fixing device 17, a fixing process is carried out, followed by the first stage of reproduction is finished. The recording material is then again uniformly through the charger is charged and reaches the second stage of reproduction.

After completion of the first partial color exposure, the movable one returns optical system returns to its original position, and at the same time the Filter disk 5 rotated by the drive device 5 a in a position in which the next following filter, for example the filter 52, is in the working position is located. In addition, only the next partial color developing device corresponding to the filter 52 now passes 14 in the operating state, in place of the device 13 of the first reproduction stage. The second stage of reproduction can then be carried out on the same way as the first.

By repeating the above-described operations for each of the required or desired stages, each stage comprising an exposure step, a developing step and a fixing step, and finally by lifting the recording material 10 from the drum 8 with the aid of the device 11, the reproduction becomes which of the multicolored template, completed.

In the example above, the original 1 is illuminated episcopically or shown. However, it is also possible through a suitable arrangement of the movable optical system to apply a diascopic illumination or image. By Appropriate choice of filters and developing devices can make multicolor reproductions according to the two-color process, the three-color process or a multi-color process can be done using even more colors.

Even if the execution described above _ruggsbeispiel_ for -the finished -Reprqduklion- the -use of fato-conductive recording material is required;. so it is also possible to use-ordinary = paper- for-the finished.reproduction to use.:Zu-dies= Purpose is to choose a device like it: by =: das -auf A b b..3-; shown. further Aüsführungsbeispiel.der invention is shown. Short said, this method consists in creating a charge image corresponding to the original on an electrophotographic recording drum - generated this. Picture with- a toner developed, the toner image on an image receiving material (ordinary Paper) .The image-receiving material is on a special Drum- is located, and then the transferred toner image is fixed.

In A b b. 3 are those with the same reference numerals of A b b. 1 designated Parts the same as for the device according to A b b. 1, the numbering in the is done in the same way. The device according to A b b. 3 - has a recording drum 8, which is hereinafter referred to as the first drum, which consists of an electrically grounded drum made of metal or a drum made of insulating material, the a photoconductive layer, for example made of amorphous selenium, on its jacket surface or an organic photoconductor. There is also a cleaning device 20 for removing excess toner adhering to the surface of the drum 8 and finally a transmission device 21 arranged, which on an image receiving material 10 a, which is attached to the drum 19, the second drum. each that Partial color toner image formed on the first drum 8 transfers. The image receiving material 10a is ordinary paper.

When operating this device, the pre-; position 1 reflected light from the movable optical system directed onto the photoconductive layer of the drum 8, which is fed by the charging device 12 . has been charged uniformly beforehand, as a result of which a charge image is formed on the first drum 8. This charge image is developed by a developing device 13 and then transferred by the transfer device 21 to the image receiving material 10 a, which is fed from the feeder 9 and fixed on the rotating drum 19 by the device 11. The image transferred in this way is then fixed by the fixing device 17. After this image transfer, the ink remaining on the first drum 8 is removed by the cleaning device 20. Then, the exposure, development and fixing of the second stage and the subsequent stages can be carried out in the same manner.

The illustration of the template and the changing of the filters as well as the Developing devices are made with the aid of the signal generator 18 and the signal receiver 18 a in the same way as in the case of A b b. 1 described example triggered. That is, the last-described embodiment of the invention differs from those according to A b b. 1 only in the fact that the Toner images formed on the recording drum are not formed on this or that on the drum remaining recording material remain, but in each case on an image receiving material and thus a finished reproduction on ordinary paper form.

Claims (3)

Claims: -1 .. Device for: Carrying out a method for producing multicolored reproductions of multicolored originals. on. electrophotographic. Schematic way in which a charged photoconductive layer is exposed with a partial color image, the originals and the partial color charge image thus formed is developed and fixed with a developer colored according to the partial color and: in which these steps are repeated cyclically for all partial colors with superimposition of the partial color images, g e.-characterized by the combination of the following features: a) -a rotatable drum (8) for receiving an electrophotographic recording material (10) with a photoconductive layer, b) a charging device (12), c) an exposure device (2, 4, 5, 6, 7) for line-by-line imaging of the original (1) on the photoconductive layer (10), each in monochromatic light corresponding to a partial color of the original (1), d) a development station with several development devices (13, 14, 15, 16) ) each for a partial color, e) a fixing device (17), f) a signal transmitter (18) arranged on the drum (8) ) and a stationary signal receiver (18 a) which, in association with the process sequence, put the individual devices into action one after the other for the individual partial color images. 2. Apparatus according to claim 1, characterized in that the photoconductive layer is applied to the drum (8) photoconductive paper (10) and that the fixing device (17) adjoins the developing station (13, 14, 15, 16) in the direction of rotation of the drum , through which each partial color image is fixed. 3. Device for carrying out a process for the production of multicolored reproductions of multicolored originals by electrophotographic means, in which a charged photoconductive layer with a partial color charge image is developed and fixed with a developer colored according to the partial color and in which these steps for all partial colors with superimposition of the partial color images are cyclically repeated, characterized by the combination of the following features: a) a rotatable drum (8) with a photoconductive layer, b) a charging device (12), c) an exposure device (2, 4, 5, 6, 7) for line-by-line imaging the original (1) on the photoconductive layer, each in monochromatic light corresponding to a partial color of the original (1), d) a development station with several development devices (13, 14, 15, 16) each for a partial color, e) a second rotatable drum (19) with a fixed axis that supports an image receiving material ( 10 a) carries and rolls at the same peripheral speed on the first drum (8) , f) a fixing device (17) on the second drum (19), g) a signal transmitter (18) arranged on the second drum (19) and a stationary one Signal receivers (18 a) which, in association with the process sequence, set the individual devices one after the other in action for the individual partial color images, and h) a cleaning device (20) on the first drum (8) for removing the color residues after each toner image has been transferred.