JPS63212960A - Copying machine - Google Patents

Abstract

PURPOSE:To copy black and white characters, and a color picture pattern by one set of copying machine, by providing a means for designating separately a copying range, character black developing device, and a full color developing device with respect to a copying original having a character part and a picture pattern part. CONSTITUTION:When a copy button is pushed, an original is fed onto contact glass by an automatic original feeding device, and first of all, exposed through a color separation filter 8 of blue, green and red with respect to a picture pattern part, developed by developing devices 5Y, 5M and 5C of yellow, magenta and cyan, exposed without a filter and developed by a full color black developing device 5BK. In this case, other parts than the picture pattern part and a designated range are controlled so as to be erased by an eraser, and its parts are not developed. Subsequently, a character part is exposed without passing through the filter 8, and developed by a character black developing device 4. In this case, other parts than the character part and a stored part are erased and not developed. Subsequently, five kinds of toner images are divided in five times, and superposed and transferred to transfer paper wound around a transfer drum 6, separated by the drum 6 and fixed by a fixing device 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a copying machine that is capable of reproducing both text and picture areas of a copy document having text and picture areas with gloss suitable for each.

BACKGROUND TECHNOLOGY Conventionally, full-color copying machines have been equipped with a developing device around one photoreceptor drum containing developers of yellow, magenta, and cyan, which are the three primary colors of color, to convert color originals into blue, which is the three primary colors of light, and blue, magenta, and cyan. The photoreceptor is exposed to light three times after color separation using three colors, green and red, and each of the obtained latent images is developed with the developer of the above three colors, and the resulting three toner images are transferred on one sheet of 1K. A full-color copying machine using a color separation image superimposition transfer method in which images are superimposed on paper, transferred, and fixed to obtain a full-color copy is well known. Note that the spectral transmittance characteristics of the blue, green, and red filters used for the above color separation and the spectral reflectance characteristics of the yellow, magenta, and cyan developers do not match the theoretical characteristics, so these colors alone cannot be used. For those who cannot reproduce black or dark colors, a four-color superimposition method is also adopted in which a black developer with black developer is installed, and the image is exposed through a yellow filter or layered filter and developed as black. In the image overlapping transfer method, instead of providing three or four color developing devices around one photoreceptor drum, one color developing device is provided around three or four photoreceptors, and each photoreceptor is One color original is color-separated using different color filters, and a light image is exposed to light, developed with developer of each color, transferred to transfer paper that is conveyed by successively contacting each photoreceptor, and then fixed. Full-color copying machines designed to do this are also well known.

Up until now, full-color copying machines have been mostly used in copy shops, where they charge a fee to make color copies upon request. Copying of line drawings and line drawings is done using a regular black and white copying machine, depending on the purpose of use.

However, in recent years, it has become desirable to be able to copy text and pictures on a single sheet of paper using a single copying machine. In this case, it is desirable that the pattern portion be reproduced as a glossy image, and that the characters and line drawings be reproduced as a matte image. however,
In conventional full-color copiers with the above configuration, black is reproduced in three colors: yellow, magenta, and cyan, or in a mixture of four colors including black, so the text becomes glossy just like the image. The problem was that it became difficult to see.

Purpose The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a copying machine capable of producing copies in which text is matte in black and white and patterns are reproduced in full color with gloss. do.

Structure In order to achieve the above object, the copying machine of the present invention includes a full-color developing device each having a plurality of color developers that can be superimposed to obtain any color, and a developing device having a black character developer. , having a means for separately specifying a copy range for a copy document having both a text portion and a picture portion;
The latent image corresponding to the area specified for copying as the text area is developed with a black text developer, and the latent image corresponding to the area specified for copying as the pattern area is developed using multiple full-color developers, and the resulting toner is It is characterized in that it is controlled so that the image is aligned and transferred onto a sheet of transfer paper.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of the main parts of a color copying machine according to an embodiment of the present invention.

Around the photosensitive drum 1, in the order of the rotation direction indicated by the arrow, there are a charger 2, an exposure section 3, a black character developer 4, a full color black, cyan, maze/yellow, and yellow developer 5BK, 5C, 5M, 5Y.

A transfer tram 6 and a cleaning unit 7 are provided. The optical path leading to the exposure section 3 is switchable between blue, green, and blue.
A red color resolving filter 8 is provided, so that no filter can be inserted into the optical path.

When the toner of the developer contained in the black character developing device 4 is fixed, a matte image is obtained, and the toner of the developer contained in each of the full-color developing devices is fixed. It is said to be able to produce glossy images. The transfer drum 6 has the same diameter as the photoreceptor drum 1, rotates synchronously and at the same linear speed, and is provided with a transfer charger 9 inside a transfer portion that contacts the photoreceptor drum. The transfer paper fed from the registration roller 10 is held at the tip by a clamper (not shown) and wound around the transfer drum 6, and after the toner images of each color are aligned and transferred as is well known, the transfer paper is transferred to the static elimination charger 11. The electricity is removed by the transfer drum 6, and the fuser 1 is separated from the transfer drum 6.
The image is fixed in step 2 and the copy is completed.

FIGS. 2(a), 2(b), and 2(c) are views showing the appearance and top of the copying machine of this embodiment. An automatic document feeder (ADF) 30 is provided.

A document insertion table 31 on the upper side of the ADF 30 serves as a development area designation section (editor). A scale 35 is provided on two orthogonal sides of the mounting surface.

For example, as shown in FIG. 3, if two picture areas ■ and ■ are drawn and text is written in the other parts, and you want to specify the text part and the picture part of the manuscript 36, as shown in FIG. Place the manuscript 36 on the editor 31 in accordance with the reference 32, and use the pick pen 33 to first select the addresses according to the vertical and horizontal scales in the four corners of the picture section ■, then the picture frame in the order of a16 a of 3, d of 6, and d of 3. move around it. When the box is finished, press the picture box button 34.
Press a'i to memorize. Next, specify the range of the picture part (■) using the same procedure. Other parts are automatically stored as character parts. Conversely, it is also possible to first designate the range of the text section and store it by pressing the literature department designation button 34bt, and then automatically store the rest of the region as the picture section.

Next, press the copy button (not shown) and one original will be AD
The light is sent onto the contact glass by the F mechanism and exposed five times. First, the image is exposed to light through blue, green, and red filters, developed with yellow, magenta, and cyan developers 5Y, 5M, and 5C, exposed without a filter, and then developed with full-color black developer 5BK. Developed. At this time, the area other than the area specified as the picture area is controlled to be erased with an eraser (not shown), and this area is not developed.Next, the text area is exposed to light without passing through a filter, and black development for the text is performed. Develop using device 4. In this case, ft is stored as the character part.
Areas other than the 7j range are erased and not developed.

The five types of toner images obtained in this way are superimposed and transferred five times onto a transfer paper wound around a transfer drum 6, separated from the transfer drum 6, and fixed by a fixing device 12.

As a result, the picture area is reproduced as a glossy full-color image, and the text area is reproduced as matte black text.

FIG. 5 shows that the present invention is applied to a plurality of photoreceptor drums, each of which has a different color.
FIG. 2 is a diagram showing an embodiment applied to a color copying machine equipped with two developing devices.

Developing units 41 and 42BK each have a black developer for characters, a black developer for full color, and a cyan, magenta, and yellow developer for full color on the five photosensitive drums.

42C, 42M, and 42Y are provided. A latent image is formed on these photoreceptors by color-separating and reading the original by distinguishing between the character part and the picture part, and by modulating the obtained image information signal, a laser beam is applied by the optical writing device 43 to form a latent image. Developing devices 41 and 42 attached to each photoreceptor 40
It is developed with The toner images of the respective colors are transferred by a transfer belt 44 to a transfer paper conveyed in contact with each photoreceptor in a aligned manner, and then fixed by a fixing device 45, resulting in a glossy full-color image in the pattern area as in the previous embodiment. Text in the image is reproduced as matte text.

When making regular full-color copies without text, there is no need to specify the area, and full-color copies can be made using only a full-color developing device in exactly the same way as a conventional full-color copying machine that uses color separation image overlay transfer method. Obtainable.

FIG. 6 is a flowchart showing the area designation and copy operations described above.

It is appropriate that the glossiness of the image using the black toner for characters used in the present invention is 3 to 5%, and the glossiness of the color toner is 20% or more. This glossiness can be controlled by the softening temperature, molecular weight distribution, additives, etc. of the toner.

Effects As described above, according to the present invention, it is possible to copy both black-and-white copies and full-color copies with a gloss level suitable for each with a single copying machine, and it is also possible to copy both a picture part and a text part on a single sheet of original. Even if both coexist, it is possible to obtain a full-color copy in which each of them is reproduced with a gloss level suitable for each.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a schematic configuration of the main parts of a copying machine according to an embodiment of the present invention, FIG. 2(a) is a perspective view showing the external appearance of the copying machine, and FIG. 2(b) is an automatic document feeding FIG. 3 is a plan view of an example of a manuscript; FIG. 4 is an explanatory diagram of how to specify a copy area of a manuscript; FIG.
The figure is a side sectional view of another embodiment of the present invention, and FIG. 6 is an example of a flowchart of copying area designation and copying operations of the copying machine of the present invention. l...Photosensitive drum 4...Black developer for characters 5B
K, 5c, 5M, 5Y...Full color developer 6...Transfer drum 8...Color separation filter 20...Copying machine body 31...Editor (copying range specifying means: )) 40.
...Photosensitive drum 41...Black developer for characters 428
K, 42C, 42M, 42Y...Full color developer 44...Transfer belt Fig. 1 Fig. 2 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] A full-color developer that has multiple color developers that can be superimposed to obtain any color, a developer that has a black developer for text, and a copy document that has both text and image areas, respectively. It has means for separately specifying the copying range, and the latent image corresponding to the range designated to be copied as the text part is a black character developer, and the latent image corresponding to the range designated to be copied as the picture part is a multiple full color latent image. Develop with a developer for
A copying machine characterized in that the copying machine is controlled to align and transfer the obtained toner image onto a sheet of transfer paper.