JPH07107612B2 - Image forming device for copier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color copying machine, and more particularly to an image forming apparatus of a copying machine which is capable of copying a large number of single colors in addition to full color copying.

[Conventional technology]

In recent years, a copying machine capable of full-color copying in addition to monochromatic color has been proposed (Japanese Patent Publication No. 59-34306 and Japanese Patent Laid-Open No. 58-58306).
-68057).

The color copying machine separates the color of the original document into three primary colors, and performs copying on the same copying paper in three times. FIG. 10 is a diagram schematically showing a main part of such a color copying machine. In the figure, reference numeral 151 denotes a photosensitive drum, and an image of an original placed on the platen glass 155 is illuminated by a lamp 156 and is imaged on the photosensitive drum 151 via a plurality of reflecting mirrors. Reference numeral 152 is a transfer drum placed close to the photoconductor drum. Around the photoconductor drum 151, in addition to the corotron 158, photoconductor drum potential detectors 159, 159 'and three primary color developing devices 150, 150', 150 "containing toner of the three primary colors are placed. In the example shown in this figure, 150 is cyan and 150 '
Is a yellow developing device and 150 ″ is a magenta developing device. Further, in the middle of the optical path where the image from the original placed on the platen glass 155 is transmitted, a red for separating the image of the original into three primary colors. , Green, blue, and ND filters 157 are exchangeably placed.In the illustrated example, four filters are attached to the rotary shaft, and the rotary shafts are rotated so that they can be replaced.

Further, a control unit 160 for controlling the copying machine and an operation panel unit (hereinafter referred to as an operation panel) 161 on which operation buttons are placed are provided. In the illustrated example, the developing device bias generator 153 and the corotron voltage generator 154, which are important when performing color copying, are written outside the control unit 160, but it is said that they are controlled by the control unit 160. There is no end.

FIG. 11 shows an example of the control unit 160, which uses a microcomputer. In the figure, 165 is a CPU, which has a ROM 166 and a RAM 167, receives signals from the operation panel and various sensors via the I / O port 168, and controls the motor / blanger, potential control, development control, etc. Control. ROM166
A table relating to the corotron charging current, the light potential, the dark potential of the photosensitive drum, the bias potential of the developing device, etc. when the copy level is set is stored in the RAM 167.
Various registers are set as a work area.

When performing full-color copying in the copying machine configured as described above, for example, first the film 157 is made red and the cyan developing device 150 is used to develop cyan, and then the filter 157 is blue. And yellow developer 15
0'is used to develop the yellow color, and finally the filter 157 is changed to green, and the magenta developing device 150 '' is used to develop the magenta color. In order to accurately reproduce the original color, the development of each color is performed. At this time, the current of the corotron is controlled, the position of the photosensitive drum is controlled, the bias value of the developing device is adjusted, and the density of each color is adjusted to the optimum value.

To make a single color copy, use only the yellow developing device to make a yellow single color copy, and use only the magenta developing device to make a magenta single color copy.
Make a cyan monochrome copy using only the cyan developer.

In addition, a yellow developing device and a cyan developing device are used to make a green single-color copy, a yellow developing device and a magenta developing device are used to make a red single-color copy, and a magenta developing device and a cyan developing device are used. Make a single-color copy of blue using a container.

[Problems to be solved by the invention]

As described above, in the conventional color copying machine having the three primary color developing devices, in addition to full-color copying, yellow, magenta, and cyan single-color copies using the three primary color developing devices are independently developed. Of the two vessels, combine them two by one to make a single color copy of green, red and blue, ie 6
You can make a single color copy of a color. Recently, however, more diverse monochromatic copying has been desired, and there is a problem that conventional color copying machines cannot meet such demands.

[Means and Actions for Solving Problems]

In order to solve the above-mentioned problems, in the present invention, in order to express a single color, the same color is superposed twice, and another color is superposed so that green, yellow,
The feature is that copying is possible in each of red, magenta, blue and cyan intermediate colors.

As a result, in addition to full-color copy, it is possible to make a total of 12 single-color copies in addition to green, yellow, red, magenta, blue, and cyan, as well as intermediate colors of the above colors, making it possible to copy various colors. I can fully answer the demands I want.

〔Example〕

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

FIG. 1 shows a part of the construction of the operation panel part of the copying machine of the present invention, and particularly shows the part necessary for performing 12-color single color copying. In the figure, reference numeral 1 denotes a monochromatic color display section for displaying the selected copy color. Reference numeral 2 denotes a monochromatic color selection display section, which is composed of display elements such as LEDs provided on the respective colors. Reference numerals 3 and 3'represent single-color color selection buttons, which can be further selected in the left direction by pressing the button 3'and can be selected in the right direction by pressing 3. The numbers above the LED group 2 indicate the color numbers described later. Details of this operation will be described later with reference to FIG.

FIG. 2 is a diagram showing the principle of copying in the case of full-color copying and the case of 12-color single-color copying. That is, in the case of full color, as shown in the column of color cycle, a total of 3 copies of yellow copying, magenta copying, and cyan copying are made.
It is done in one cycle. By adjusting the copy density of each of the three primary colors, the colors of the original are reproduced as faithfully as possible. This full-color copy is called color No. 0.

Next, in the case of monochromatic color copying of green, first, copying of yellow is carried out, and then copying of cyan is carried out for a total of two cycles. In addition, this green is color No.1. Similarly, for yellow, copying is performed twice with yellow toner (color No. 3), for red, copying is performed with yellow magenta (color No. 5), and with magenta,
Two magenta copies (color No. 7), blue magenta and cyan copies (color No. 9), cyan two cyan copies (color No. 11) .

Then, according to the present invention, a monochrome copy of six intermediate colors is realized. The six-color monochromatic copy will be described below.

First, in order to make a copy of yellow-green as an intermediate color between green and yellow, first make a copy of yellow.
Repeatedly, and then copied in cyan.
This makes it possible to copy yellow green (color No. 2).

Orange, which is the intermediate color between yellow and red, can be realized by copying yellow twice and then magenta (color No. 4).

Pink, which is the intermediate color between red and magenta, is realized by copying magenta two times in succession after copying yellow (color No. 6).

Purple of the intermediate color between magenta and blue is realized by copying cyan twice after copying magenta twice (color No. 8).

Purplish blue, which is an intermediate color between blue and cyan, is realized by copying cyan twice after copying magenta (color No. 10).

Finally, blue-green, which is an intermediate color between cyan and green, can be realized by copying cyan twice and then copying cyan twice (color No. 12).

The copying of the single color will be described below with reference to FIG. The copying machine is controlled by a microcomputer as shown in FIG. First, when the power is turned on in step 1, the control unit by the microcomputer first sets the color mode to full color, and sets 0 for full color in the color number. Next, the console key input process starts. Next, when the single color selection button 4 in FIG. 1 is pressed, the CPU checks whether the color mode is full color (step 6). In this case, since full color is selected in step 2,
In step 7, color No. 6 is substituted in step 8. Then, in order to show that the color No. 6 has been selected, the LED above the color No. 6 in FIG. 1, that is, pink, is turned on (step 9). With the light on, the process returns from step 4 to step 5. Here, if the single color selection button 4 is not pressed even after the lapse of a predetermined time, the process proceeds to step 12. This time,
Since the single color mode is selected in step 7, step 13 is entered. In step 13, when the left button 3'of the color selection buttons is pressed, (color No. 1) is executed (step 14), and the corresponding color N
The o. LED lights up. For example, in this case, the color number is 6, so 6-1 = 5 is selected, and red is selected. In step 13, when the right button 3 is pressed without pressing the left button 3'shown in FIG. 1 (step 18), (color No. + 1) is executed this time. In the present case, 6+
1 = 7, that is, magenta is selected. After selecting a certain color and holding it for a while, it comes to step 22 via step 4, step 12, step 13, step 18, so turn on the start button here.

In this way, the left button 3'and the right button 3 are selectively used to select the color of one's liking and copy the color of one's liking.

After the power is turned on, if the single color selection button 4 is not turned on in step 5, the process proceeds to step 12 after a lapse of a predetermined time. At this time, since full color is selected in step 2, the process proceeds to step 22. A copy process is performed by pressing a copy start button (not shown).
The details of the operation of step 23 are shown in FIG.

Next, step 23 in FIG. 3 will be described with reference to FIG.

First, in step 1 of FIG. 4, ND is used as a filter.
Set the filter and move to step 2. The color cycle shown in FIG. 2 is obtained from the color No. selected in steps 13 and 18 in FIG. 3 and which color is to be copied and in what order. The table shown in FIG. 2 is recorded in ROM or RAM. Then, in step 3, whether or not there is a P / R0 signal (reference signal output when the photosensitive drum reaches a predetermined reference position). Is detected and the cycle counter is set to 0. In step 5, the P / R0 signal is further detected, the cycle counter is set to 1, and then step 9
Enter the color cycle process. This color cycle is
The details are shown in FIG.

Next, with reference to FIG. 5, the color cycle treatment will be described.

First, in step 1 in FIG. 5, it is checked whether the color number is 0 or not. When color No. = 0, it is full color, so step 2 (this is explained in detail in Fig. 6).
Then, the filter control for that is received. Solid color, that is,
When the color No ≠ 0, the ND filter is left as it is and the step 3 is entered. In step 33, the color number, the cycle count and the developing color are obtained from the comparison table shown in FIG. Next, the potential of the developing color developing device, the potential of the photosensitive drum at that time, etc. is controlled (step 4), the exposure control (this is done by the output control of the lamp, step 5), and then the lamp is moved. The original is scanned, a latent image is formed on the photosensitive drum, the latent image is developed in step 7, and transferred (step 8) to check whether the number of cycles is equal to the determined number. If the required color has not been copied, step 5 in FIG.
Return to and make a copy of all required colors.

Next, the filter control for full-color copying will be described with reference to FIG. First, whether or not the cycle count is 1 is detected. When the count is 1, the blue filter is set, and when the count is 2, the green filter is set. When the count is neither 1 nor 2 (this is 3), the red filter is set.

Finally, FIG. 7, FIG. 8 and FIG. 9 show the operation timing of each part of the copying machine. FIG. 7 is a timing chart in the case of full-color copying, FIG. 8 is a timing chart in the case of single-color copying of an intermediate color in which one color is copied in three cycles, and FIG. 9 is one color in two cycles. It is a timing chart in the case.

In each figure, the P / R0 signal is a reference signal that is output when the photosensitive drum reaches a predetermined reference position. In addition, TRHPSNR (Transfer Roll Home Position S in Figs. 7 to 9)
When the transfer drum reaches a predetermined reference position, a reference signal is output from this sensor as shown in (ensor).

The P / R drum is a photosensitive drum, and the T / R drum is a transfer drum.

〔The invention's effect〕

As described above, according to the present invention, it is possible to make a monochromatic color copy of an intermediate color and 12 monochromatic color copies, so that it is possible to meet various needs. Moreover, the switching operation control of the developing device can be performed only once by the single color mode including the step of continuously developing the same color twice and the step of developing the other color once. Can be simplified.

[Brief description of drawings]

FIG. 1 is an operation panel section of a copying machine to which the image forming apparatus of the copying machine of the present invention is applied, and FIG. 2 is a principle diagram of the image forming apparatus of the copying machine of the present invention, FIGS. 3, 4, and 5. FIG. 6 is a flow chart for explaining the operation, FIGS. 7, 8 and 9 are diagrams showing the operation timing, FIG. 10 is a principle diagram of a color copying machine, and FIG. 11 is a control circuit. FIG. 1 …… Single color color display section 2 …… Single color color selection display section 3 …… Single color color selection buttons (left, right) 4 …… Single color selection button

Claims (1)

[Claims] 1. A copying machine having a monochromatic color selecting means in which developing devices for at least three primary colors of yellow, magenta, and cyan are arranged, and a step of continuously developing the same color twice and a process of developing another color An image forming apparatus for a copying machine, which has a monochromatic color mode including a process of repeating.