SU683645A3 - Exposing station for a multicolour electrophotographic machine - Google Patents

Description

(54) EXPOSITION DEVICE FOR MULTI-COLOR ELECTROGRAPHIC PLAYER

one

The invention relates to a color electrophotographic copying machine and, in particular, to a control device operated by an operator, in which the means of visual reproduction is used in conjunction with the control means.

A exposition device for a multicolor electrophotographic machine is known, which contains an optical filter 1.

A disadvantage of the known device is the impossibility of observing the resulting color of the copy before copying the original.

In order to make it possible to observe the resulting color of the copy before copying the original in the proposed device, the optical filter consists of a series of successively installed plates with holes, each of which has an individual drive for moving it vertically.

FIG. 1 shows the proposed device, a general view; in fig. 2 - adjusting mechanism; in fig. 3 is a vertical view of the filter assembly; in fig. 4 is an electrical diagram of the control panel.

With an arrangement device for a multicolor electrophotographic machine, there is a drum 1 having a photoconductive surface 2 located around the outer cylindrical surface of the drum.

The drum 1 is rotatably mounted on the frame of the device and is driven by an electric motor (not shown) with a constant angular velocity in the direction of the arrow o. As the drum 1 rotates, the photographic surface 2 passes successively through a number of working positions. The driving motor rotates the drum 1 at a given speed relative to other working mechanisms of the copying machine. A synchronization disk mounted around one end of the shaft of the drum 1 interacts with the machine control means for synchronizing operations at different positions.

with the rotation of the drum 1. Thus, the required sequence of operations is performed at the corresponding positions of the process. The drum 1 first rotates the photoconductive surface 2 to the charging position A, where the corona charging device 3 is positioned longitudinally, in the transverse direction and parallel to the photoconductive

3

surface 2 to create a relatively high uniform charge on it.

After the surface 2 is evenly charged, the drum 1 rotates the surface 2 to the excursion position B. In this position, the light image transmitted through the color filter of the original 4 is projected onto the photoconductive surface 2.

Position B includes a movable lens system 5 and a color filter mechanism 6. The optical filter 6 works in conjunction with a regulating device to create the desired light image. Original. 4, for example, a sheet of paper, a book, etc. is placed face down on the transparent plate 7. The lamps 8 are adapted to move in a certain ratio of time with the lens 5 and the filter 6 to scan successively increasing sections of the original 4 placed on the plate 7. The light image of the original 4 is projected onto the photoconductive surface 2. During The filtering mechanism (6) places selected color filters on the optical light of the lens 5. The corresponding filter acts on the light rays passing through the lens 5 to form An electrostatic latent image on a photoconductive surface 2 corresponding to a preselected zone of the electromagnetic spectrum of the spectrum and subsequently related to a single color of the electrostatic latent image.

The drum 1 then rotates the image to the position B of the display. In this position, three separate developing mechanisms 9-I are arranged to transform an electrostatic latent image recorded on a photoconductive surface 2 into a visible one.

Preferred developing mechanisms are those related to magnetic brush developing mechanisms. A mysterious magnetic brush system uses a magnetized developing mixture that includes carrier granules and bend particles. Usually, the bend particles are heat-generating. During the process, the mixture of the developer is continuously fed to form a brush. The electrostatic latent image recorded on the photoconductive surface 2 comes into contact with a brush from the developer mixture. Turning particles are drawn from the protel mixture to the latent image. Each nanopart mechanism contains respectively colored turn particles, normally corresponding to complementing a portion of the spectrum of the wavelength of light transmitted through filter 6. For example, a latent electrostatic image passing through a green filter is displayed by means of

Paving a green fuchsin turn into it; the latent images passing through the blue and red filters appear as particles of yellow and blue-green curves, respectively. The adjusting device operates in normal mode, but if you change the way you work, the regulating device may change the filters

so that the existing manifesting materials do not contain particles of a turn of additional color to the necessary, non-editable through them. The final colors of the horse will not match the original, but they can be rearranged as desired. The adjustment tool also shows the color of the knight, which helps the operator determine the results of the filter permutation.

After the appearance of the image, my image now moves to the elusive position of G. In this position, the powder image — the bend of the powder adhered electrostatically to the photoconductive surface 2 — is transferred to the substrate sheet. Substrate 12 may be either a sheet of paper or a thermoplastic hemisulfonic material. The transfer drum 13 presses the substrate 12 to move with it. The transmission drum 13 is adapted to rotate in the direction of arrow b synchronously with drum 1 (in this case, at the same angular velocity). Consequently, a plurality of bendings depicted in the brush can be unchanged from the photoconductive surface 2 onto the substrate 12, and each such image is respectively combined with the previous one. Image transfer is achieved by

electrically balancing the transmission drum 13 to a potential of sufficient magnitude and the desired polarity for electrostatic attraction of the bend particles from the latent image on the photoconductive surface 2 onto the substrate 12.

After transferring a plurality of stale powder images from the photoconductive surface 2 to the substrate 12, the gripping fingers 14 separate the substrate 12 from the surface of the drum 13. The separating plate 15 is then placed between the substrate 12 and the transmitting drum 13. This separating the substrate from the transmitting

the drum allows the conveyor 16 to move the substrate to the position D fixation.

In the D-fixing position, the melting device permanently attaches the powder turn image to the substrate 12. The substrate with the powder turn image permanently attached to it is conveyed (not shown) to a special tray that is arranged so that the operator can quickly remove the finished mine from the printing machine.

The stack 17 of the substrates 12 is located on the pallet 18. The feed drum 19 cooperates with the retaining drum 20 to advance the top sheet from the pack 17 to the shutter 21. The shutter 21 guides the feed sheet into the gap between the drums 22, which align the sheet. The drums 22 move the sheet to the transfer drum 13 where the sheet is fixed to move along a closed path.

The final position of the process in the direction of rotation of the drum 1 is the cleaning position E.

The majority of the turn particles are transferred to the substrate 12, however, some of the particles remain on the photoconductive surface 2. In the cleaning position E, these turn particles are removed. First, the residual particles of the turn are brought under a corona-causing cleansing device (not shown), which serves to neutralize the residual electrostatic charge on the photoconductive surface 2, and the turn particles stick to it. Thereafter, the neutralized twist particles are cleaned from the photoconductive surface 2 by rotating the fiber brush 23 in contact with it.

In the normal copying process, when the copy must be reproduced in the same color as the original, the filters are applied in a specific sequence. The turns of magenta, blue-green and yellow contained in the display positions are used for successive manifestations of the latent electrostatic image recorded on the photoconductive surface 2. Similarly, this MV green filter is used for the magenta appearance, the red filter is for blue-green and blue filter - for yellow.

When a green filter is placed on the optical path, the green color from the original document is transmitted to the photoconductive surface 2. The irradiated portions of the photoconductive surface are discharged. The charged areas appear as fuchsin turn particles, i.e. particles of the corresponding color. Such a corner image is subsequently transferred to the pad 12.

In the next position, the red filter is located on the optical path with the green and blue filters removed from it, so that the red color is transmitted from the original to the photoconductive surface. And the newly irradiated areas are discharged, and the charged ones appear as particles of turn corresponding to red, i.e. blue-green. The image from the blue-green powder turn is transferred to the substrate 12 when combined with the first image from the fuchsin powder turn. On the third pass of the display, a blue filter is placed in the optical path, and all other filters are extracted to transmit blue light. The charged portions of the photoconductive surface 2 appear as yellow bend particles in the same way as the first two described passes, after which they are transmitted to the substrate 12

when combined with the first two images.

The black areas of the original absorb light from the three zones of the spectrum so that the potentials depicted on the photoconductive surface are sufficient to show all three bends, and the black color on the finished copy is obtained. Where the original was fuchsin, blue-green or yellow, the additional filter creates a picture of the image that is sufficient to show only in highly sensitive areas of the spectrum and, thus, each will be reproduced in one color of the turn — fuchsin, blue-green or yellow, respectively . Areas that are red in the original will be shown in yellow and flksinovym due to the fact that the red color will be absorbed in the green and blue zones, respectively. High reflection in the red zone will discharge the photoconductive surface so that the appearance of blue-green in the red zones will be contained. Similarly, the green areas on the original discharge the photoconductive surface during exposure through the green filter, thereby holding back the appearance of fuchsin, while the green areas absorb the red and blue colors, creating a potential on the photoconductive surface.

sufficient for manifestations of fuchsin and yellow, respectively. Blue areas will be reproduced in magenta and green-blue, as blue is reflected from the original and transmitted via blue

the filter discharges the photoconductive surface sufficiently to keep the nucleus yellow. In this way, both black and six other colors can be reproduced, including their shades.

When using a machine for electrophotographic copying in its normal mode, but without one or a few cycles of the development process, it is obvious that black cannot be reproduced,

since it requires three colors. The device is being set up like this. to make consistent manifestations occur consistently with the use of appropriate filters. Thus removing

a separate filter and its corresponding color turn exclude this integral part of the color from the final copy, wherever this excluded color appears as a whole or as an integral part of another

colors. For example, if the original document was completely black and all developing mechanisms were turned off, with the exception of the blue-green mechanism, then a red filter could be used to absorb all the non-red color components. Only red could pass to the photoconductive surface, and all images that absorb the red color (in this example it is black) would be produced with the help of a blue-green developer, producing a blue-green and white copy. If, however, the original document also contains a red color and the same operations were performed, the red color from the original would be transmitted by a red filter, discharging the photoconductive surface, and the red image was not produced.

Regulatory and reproducing fixtures determine which filters to apply and show the colors of the copy. Prior to that, each applicant had to act with a certain filter and there was no showing device.

FIG. 2 shows an optical filter 6, which includes a housing 24 mounted on the lens 5 so as to move with the lens during scanning. The housing 24 has an optical window 25 which is positioned relative to the lens 5 so that it allows the light from the original 4 to pass through the lens 5, irradiating the photoconductive surface 2 to record an electrostatic latent image on it.

Lower 26 and upper 27 hull walls

24, there are several tracks 28 and 29 that are located across the entire width of housing 24. Each track is adapted to move the filter so that the filters can move from the inoperative position on the right side of the case to the working position in the window of the case, allowing light to pass through. The filters are shifted to a position that allows them to be placed in an optical window with the help of individual tension springs 30.

25 body 24. Spring 30 is stretched from a pin mounted in each individual track 29 through the grooves in the upper part of the filter. The spring 30 is mounted around the filter frame roll 31 and is held with its end in a hole made in the protrusion 32 on the filter. Similarly, each filter has a bottom spring 33 held by a pin on the bottom track and passing around roller 34 into a second hole in the protrusion 32. A locking pin pointing upwards to the bottom of the track 28 of each filter fixes the filters in a position that does not coincide with window 25. The selected filter is placed in the optical path of window 25 of housing 24 due to the action of the selected solenoid 35 (in this case

one of the three solenoids). The action of the selected solenoid 35 causes the corresponding pin to move downward from track 28 n out of contact with the corresponding filter, allowing the springs around the filter to bring it into the optical path of the window. (An electrical circuit adapted to drive the desired circuit is shown in

FIG. four.)

Filter 6 is in window 25 for the entire scan period of the original (Fig. 2). Lens 5 and lamps 8 are adapted to return to their original position with the aid of a spring after completion of the scan. During the return of the lens 5 and the lamps 8, the inserted filter is taken out of its working position, allowing the next filter to take its place. A swing return lever 36 is mounted on pin 37 on the outside of the housing to return each filter to its inoperative position after it has been placed in window 25. In the wall of housing 24 there is an arcuate

a groove for receiving the finger 38 mounted on the lever 36. The finger 38 leads the lever 36 in this arcuate groove, restricting its movement. The tension spring 39 attaches to the lever 36 and moves it up.

In the wall of the housing 24, three parallel pipes 40 of sufficient length are placed in order to allow the filter to move from the non-operating to the working position. Each of the grooves 40 corresponds with samoy

high of the tracks 28 supporting the filter. The lever 41 is mounted on the bottom of each filter and protrudes out through one of the slots 40 corresponding to a specific track. Element

42 is mounted at the end of the lever 3G for connection with the lever 41 of the corresponding filter when it is in the operating position.

Sliding elements 43, 44 and 45 (Fig. 3)

connected for movement with individual color-indicating plates 46, 47 and 48, respectively. When any of the sliding switches moves, the corresponding plate moves too. Each switch has a control hole 49, 50 and 51, respectively, in its color plate. The control hole of each plate is connected to an elongated hole 52-57 in the other plate so that movement between the plates can occur as a slip. Each of the plates is mounted in sliding guides in the outer wall of the machine control panel.

The lower part of each of the plates has translucent holes 58 according to the programmed colors. Groups of holes are located in front of the white surface 59 for easy recognition.

colors, and face plate 60 has seven

additional colored dots 61 arranged so that they coincide with the openings of the face plates. On one side of the faceplate, the colors of the color dots 61, representing the colors that the machine can reproduce, are printed.

Since the sliding plates are relative to each other, the various translucent holes 58 in the plates are aligned in accordance with the position of the sliding elements 43-45 so that the location of the latter will determine the color output in the colored dots 61.

If the sliding members 43-45 are arranged diagonally, they are in a normal working sequence for full color reproduction; the colors of the translucent holes 58 are aligned with the colors on the faceplate 60. If the sliding elements 43-45 are moving, they change the colors in the color dots 61, so that you can quickly, before creating a copy, determine the movement of the colors, which should be obtained in this selected copying method.

If in the original it is necessary to replace one color with another, then the regulating panels should be fixed diagonally opposite to that shown in FIG. 3

A red filter and a blue-green turn are used for the slide element 43, a green filter and a fuchsine curve for the slide element 44, and a blue filter for the slide element 45 and a yellow turn.

To change colors, it is necessary to set the sliding element 43 to the blue / blue-green position, the sliding element 44 to the green / magenta position and the sliding element 45 to the yellow / red position. Thus, the red and blue colors should be completely rearranged while maintaining the black in the original. However, as a result of this movement of colors, all the yellow and blue-green areas of the original pereetav.

As shown in FIG. 4, a three-pole flip-over latching relay is used to switch the operating mode of the device from normal to control mode and to be controlled by the operator.

In normal operation, contacts 62-64 of the relay are closed, and contacts 65-67 of the relay are open. Sliding switches 68-70 are bypass switches. This connects the power lines 71-76 to the lines 77-82 directly, whereby the corresponding solenoids of the filter bank are energized, regardless of the control and output device.

When the three-pole flip-over latching relay is in the control and regulation mode by the operator, the contacts 62-64 of the relay are open, and the contacts 65-67 of the relay are closed. Sliding switches 68-70 connect the power lines 71-76 to lines 77-82 so that the desired filter is activated. The sliding element 43 is located so as to connect the power line 73 to the line 79, whereby the image passing through the blue filter must be shown by particles of the blue-green outside. Slide ny element 44 is positioned so as to connect power line 72 to line 78, whereby the image passing through the green filter shows up as a fuchsian turn. Finally, the slider 45 is positioned so that the thread of the power line 71 is connected to the line 77 in order to obtain an image that has passed through the red filter, which is shown by particles of a yellow turn.

Claims (1)

Invention Formula An exposure device for a multicolor electrophotographic machine containing an optical filter, characterized in that, in order to be able to observe the resulting color of the copy before copying the original, the optical filter is made of a series of sequentially installed plates with holes, each of which has an individual drive for moving it vertically. Sources of information taken into account in the examination 1. US patent K ° 3679301, cl. G 03G 15/00, publ. 1972. FIG. 2 5/70  rff  f7 -rU f-y