DE2004868A1 - Method for selectively reproducing images - Google Patents

Description

UARCO INCORPORATED, West County line Road Barrington, Illinois, V.St.A.

Method for selectively reproducing images

The invention relates to electrophotographic copying methods, especially those based on the principle of xerography or light reproduction.

Electrophotographic copying processes based on the principle of xerography are known and are widely used. The details of these methods are disclosed in U.S. Patents 2,551,582, 2,357,809, 2,297,691, 2,221,776, 2,573,881, 2,576,047, 2,600,580, 2,613,551, 2,618,552, 2,619,418, 2,638,416, 2,659,670, 2,690,394, 2,725,304, 2,745,327, 2,751,616, 2,772,991, 2,777,957, 2,777,418, 2,808,023, 2,815,330, 2,817,598, 2.B17.765, 2.877.133, 2.897.691, 2.951.443, 3.043.686, 3.128.683, 3.244.083.

In xerographic processes, a distinction is made today between systems with direct electrostatic transmission or systems with indirect electrostatic transmission.

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In the direct transfer method, the copy paper has an electrostatic pickup layer Charges on · To specific characters directly in the form of Lioht is used to transfer electrostatic charges to the above-mentioned layer of copy paper. That Copy paper is baked on it in contact with a black toner, which is attracted by the paper in the appropriate places, so that on the Paper creates a clear picture. In the case of the indirect transmission method, a cough is used electrostatic charge on an intermediate element, such as for example a drum surface generated. The toner is then brewed in contact with the drum surface and transferred from the drum surface to the copy paper, on which he then creates the image. The indirect transfer method does not require the paper is covered with a Spezialsohioht.

Attempts have been made with xerographic processes to produce or reproduce documents, which has a background chioht and one printed over it Sohioht have other material. As a material for the background layer, light or white ink has usually been used. It was found that the background material also generates an electrostatic charge which attracts toner during the copying process. Therefore, the background material was reproduced in the same way as the one above it printed Sohioht. The background image reproduced was far more intense on the copy than on the Original and left the others from the original transferred image areas take a back seat. That was both direct and indirect Method of the case. For example, one has tried

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With the help of xerographic processes, the front of To reproduce vehicle documents) it turned out, however, that the background in comparison to the Aufdruok much too stood out strongly.

The problem of making a copy that is similar to what the original looks like, one has solved in a less than perfect way that instead of an original one has a dem Original corresponding pattern used, but not one The background was that the copy paper was printed separately with the background and then a drum copier machine was run to produce the image corresponding to the pattern to transfer to the copy · This procedure is feasible because the image of the pattern is on the drum is produced; and since the pattern has no background, no electrostatic image corresponding to the background is created on the drum. She pulls drum then the toner and transfers it to the copy, which has previously been printed with the background. One such Method can be used to produce a copy that looks similar to the original, but the pattern corresponding to the original must not have a background does not look alike even to the original document.

The pail is different if, instead of the indirect drum transfer method, the direct transfer method is used. If an electrostatic image is generated directly on the copy with the aid of light and the The copy itself has been printed with the background material beforehand, this also creates an electrostatic image of the background material on the copy If the copy is now supplied with toner, the toner will also stick there, where the background material was previously printed on the copy

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has been. The background therefore appears so black and darkens the copy.

The problem of creating a background on a copy is not limited to the reproduction of documents. The same problem arises if so desired is to cut out parts of an image to be copied and / or to add certain parts. This can be, for example, with car papers, with Soheok entries or the like Be case. If, for example, payments are to be monitored with the aid of computers, it may be useful to have a large number of blank forms available in the form of copy papers. on which the corresponding signatures and other information are already provided. These forms could be fed to the computer, with the computer showing the name of the debtor and the amount of money to be paid The amount paid would have to be entered on each form using xerographic methods if there was a way to prevent the background from being thrown through xerographic process used, protrudes too much and darkens the desired copy or in its Brightness values distorted.

The invention provides a method for copying or reproducing certain parts of a huster, the reproduction of undesired parts of the image being suppressed or whereby the mentioned undesirable parts are reinforced. The unwanted parts can either be on the pattern or on the copy paper. The invention is particularly useful for providing a background in reproduction suppress su or intensify a background. Without using the method according to the invention

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the mentioned background can also be transferred and darken the reproduced desired image. The procedure can be done using conventional electrophotographic equipment, which is either by the direct electrostatic transfer method or by the indirect electrostatic drum transfer method is working. Conventional electrophotographic copier papers, coated or uncovered, can be used as they are common with such devices. The pattern used in the process of making Copies is used, has parts, the copy in the form of light-absorbing ink on a! a light-impervious carrier, is desired. The parts that are not reproduced or intensified are present on the pattern or copy paper in the form of non-absorbent paint. Usually it is a transparent color, which leads to a reflection of the light, which is essentially the Liohtreflection on the carrier is equivalent.

Although the invention can be used in various ways, only a single exemplary embodiment will be discussed below the application of the invention will be described with reference to the accompanying drawing.

Show it

1 shows a pattern which is suitable for reproducing copies using the method according to the invention is;

Fig. 2 shows a sheet of xerographic copy paper, which through a xerographic process with an electrical

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trostatic charge image is provided that the Pig's cough. 1 corresponds to;

Figure 3 is based on the Pig model. 1 xerografisoh reproduced copy

Reference should first be made to Pig · 1. This figure shows a pattern to be copied xerographically. The pattern has a light-impervious paper backing 10 on, the one with a background imprint made of transparent yellow color 12 is provided. Furthermore, the wearer has a recognizable lettering in the form of normal characters which have been provided on the support by means of ion-absorbing black paint. Naoh the pattern should make a copy; become, what the sohriftzeiohen 14 in black color, without the transparent yellow color 12 leading to undesirable effects. For this purpose, the pattern shown in FIG. 1 is subjected to a conventional xerographic copying process, with a copy paper as shown in Fig. 2 is used. The copy paper is denoted by the reference numeral 16 in FIG. During the copying process, a Cover layer 16a of the copy paper 16 electrostatic Charges and holds them. The result is the charge image 18, which the light-absorbing characters 14 on the Pattern corresponds · Since the background is printed on the pattern in yellow transparent color, the light enters duroh the color 12 hinduoh and is reflected on the surface of the carrier 10, so that the color 12 no generated electrostatic charge image on the surface 16a of the copy papere. In this way, the Transfer of the unwanted background excluded. This aspect is particularly useful in the case of direct electrostatic transmission.

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The electrostatic charges 18 pull during the During the xerographic process, a black toner or other powdered material is applied and shaped a B & ld 20 (Pig. 3) on the copy paper 16. The image 20 corresponds to the characters 14 shown in black on the cough.

The present invention can also be used to make copies, which are very much original documents looking similar. In this case, samples are first produced from the original documents, which are the same as the original documents can see themselves similarly, but not see similarly have to. The copies are then made according to the samples. Reference is made to FIGS. 1 to 3. The copy paper 16 has a pre-printed background 22 in a transparent color. The background does not generate any electrostatic charge during the copying process. It will therefore be where the Background is also no! Eoner attracted, with the exception of the places where there is electrostatic charge accumulate on the pattern 10 due to the printed characters 14. The result is the copy shown in Fig. 3} ■ ie has a background 22, but it is not intensified.

A combination based on the fact that a background should not be transferred or that a copy should be provided with an additional background can be used can be realized by using transparent paint to print the file, which does not transfer are to be used and / or that transparent ink is used for printing the copy paper with the image part

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which should not be influenced by the xerographic process. If the background 12 should not appear on the copies and if a background 22 should instead be preprinted on the copies, the invention can be applied using a simple xerographic process xerografisohen machine to show exactly where the pattern is to be arranged during the reproduction, in particular if an image part is to be reproduced on a copy at a position which deviates from the position of this image part on the "pattern. For example, the columns in certain figures The urine on a certificate or title can be moved to the position of a different name, erasing the previous name on the design. Identical copies can also be made by having the same parts of the image on both the Pattern also printed on the copy paper t using transparent ink for printing. If the copy paper let been example vorbedruokt 16 in Figures 2 and 3 with the same background 12 in the same transparent color AUOH as "f original 10 in Fig. 1 eeigt and when the background 22 is not present on the copy paper 16, so the final copy shown in FIG. 3 would be identical to the original shown in FIG.

The pattern carrier can consist of any liohtundurohläseigen material; usually this material is paper. Those parts of the picture that should not be reproduced are printed on the carrier with transparent

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applied parenteral color. The transparent color usually contains oil-soluble colorants. For example, acidic or basic dyes can be used in one suitable binders can be used. The background color can be light-absorbing, the light-absorbing capacity however, the background color should not be greater than that of the carrier surface. Bine such color appears to a xerographic machine as transparent, but it is visible to the human eye. However, the visibility is only in the height of the infrared range.

Xerographic processes and copy papers used for Implementation of the method according to the invention are suitable, are state of the art. With the drum transfer method Uncoated copier papers are usually used, while electrostatic papers are direct Transfer method coated copy paper can be used. With regard to the implementation of the invention Process suitable xerographic processes and copy papers are based on those given above Patents referenced. The same transparent dyes can be used to make the copy paper with preprint any background which during the copying process is neither darkened nor intensified will.

Light-absorbing dyes are usually used xerographic patterns for printing, d. H. at official documents etc. used. Although transparent dyes are not as common as light absorbing ones There are many transparent dyes known. For example, aolohe tranapa-

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pensions dyes described in U.S. Patents 2,567,963, 2,772,983 and 2,796,415 described 2567965 _f. The dye should be stable to light so that its color does not change under the influence of the xerographic process. Suitable transparent colors have been developed, for example basic auraic dye (a dye of the triphenylmethane type) or red or blue acidic dye in a transparent binder are popular. Such a transparent binder is, for example, thick linseed oil, cyclized rubber resin which has been brought to a suitable viscosity with a solvent such as Flasoh oil (magic oil), or esters of the

resin acids dine in bottle oil or other solvents. When producing a pattern, it is expedient to first print the transparent background 12 on and that the photo-reproducible layer 14 is then printed over the background 12.

The following examples serve to illustrate the invention, but they are not intended to limit the scope of the invention restrict.

Examples 1 to 3

* Three transparent dyes were prepared in which an oil-soluble auramine O is basic (rub (auramine

0 basic yellow dye) contain around 25% in the following binders

Color sample no. Binder

1 thick linseed oil

2 40 wt. * Alpex 44-400 (cycle filter

Kautaohuk resin) in magic oil

3 50 wt. T pentalyn K (pentaerythritol

Esters of dimeric resin acids) in magic oil

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The three color samples were printed in a Vanderoook proof press machine on white xerographic copy paper applied in such a way that transparent yellow image areas were created, as indicated by the reference number 22 in Pig. 2 are indicated. After drying, the copy paper was subjected to a xerographic process, to print the characters 14 of sample 10 in Pig. 1 to be mapped. The yellow background 22 he-bchien on the final copy in the same way as on the original copy paper and the rest of the image was taken over from the print of the pattern in the same way so that it appeared on the yellow background.

Examples 4 and 5

Example 1 was repeated, except that oil-soluble Laoarno pink dye is a basic dye triphenylmethane type) and phthalocyanine blue (monastral blue) was used in Examples 4 and 5 instead of the yellow dye in Example 1. In the Similar results were obtained with the xerographic copying method.

Examples 6 to 8

The three colors were on a Yanderoook Proof Pressmas chine applied to a roller carrier paper, so that a transparent yellow part of the image was created, as he did through the reference number 12 in FIG. 1 is indicated. After this The background material was then overprinted with reflective black paint to create distinct marks to obtain. Then the leaves were re-opened

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dries. If the resulting samples at a xerographic process with direct electrostatic transfer was used to reproduce copies, so the background printed in transparent yellow was not reproduced - only the reflective ones black characters appeared on the copy.

Examples 9 and 10

Example 6 was repeated, except that oil-soluble Lacarno pink (Lacarno pink is a basic dye the thriphenylmethane type) and phthalooyane blue (Monastral blue) for Examples 9 and 10 instead of the yellow dye used in Example 6 were used. In the xerographic process were obtained similar results.

No further transparent dyes using other binders have been investigated and found to be suitable found. Other binders available at Warne may also be used, such as a mixture made of phenolic resin or esterified resin in flash oil. Heat dryers Paints are dried by letting the heat remove the solvent content, i. H. that expels flaeh oil. Dry binders are, for example, varnish containing alkyd resin in linseed oil with cobalt or magnesium Accelerators and engraving color varnish (gravure ink laoquer) such as nitrocellulose in a solvent, plasticizer or the like. It can too Combinations are used, such as alkyd resin varnish plus phenä * formaldehyde resin (usually with high molecular weight) and flash oil. The dye can be appropriately dissolved in an oil or other solvents

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before it is mixed with the binder. If soluble dyes, i.e. not insoluble pigment parts, are used, there are no problems in terms of usability, mixing ability or the dispersibility,

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Claims (1)

-U- PATENT CLAIMS Process for reproducing selected parts of the image βineβ pattern on a copy sheet, with selected image parts of the pattern not being reproduced are suppressed, characterized in that a non-permeable carrier is used as the pattern on which the selected parts of the picture are applied with visible, moisture-absorbing paint, that the unselected image part · on the copy sheet and the Lichtundurohläseigen carrier of the pattern With no visible non-absorbent paint applied to the north and then the selected parts of the picture from the patterns are photocopied onto the copy sheet, resulting in a copy with the selected image parts arises on which the unselected parts of the picture are essentially non-existent. 2. The method according to claim 1, characterized in that that the unselected parts of the image are applied to the copy sheet with transparent paint. 3. Method according to Claim 1 or 2, daduroh gekennzeiohnet that the nioht selected image parts on the pattern can be applied with transparent paint. 4. Method according to Claim 1, characterized by that the photocopying process is a xerographic process in which an electrostatic image A covered copy paper through the differences in the light reflection of the image part on the pattern is generated and in which a dark clay material BATH ORIGINAL 009839/1867 is attracted by the charges of the electrostatic image and produces a correspondingly visible image generated on the copy paper. 5. The method according to claim 1, characterized in that the non-light-absorbing color is transparent Paint that contains a binder (vehicle) made from diokem linseed oil varnish (bodied linseed oil varnish) or from cyclized rubber resin or from esters of dimeric resin acids consists. 6. The method according to claim 5, characterized in that the paint contains auramine dye. 7. The method according to claim 5 »characterized in that the binder (vehicle) is bodied linseed oil varnish. θ. Method according to claim 1, characterized in that the unselected image parts represent a background, which is applied to the cough in transparent color and that the selected image parts on the Background with nioht transparent liohtaborbierenden paint are applied » 9. The method according to claim 3, characterized in that the transparent color and the light-absorbing color visually differ from each other. 10 · The method according to claim 9 »characterized in that the transparent color is colored (multicolored) and that the liohtabeorbierend · color black iet. 009839/1867 _BAD ORIGINAL Blank page