JPH04366Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an electronic copying machine that performs, for example, multicolor copying.

Technical background of the invention and its problems For example, in an electronic copying machine that performs multicolor copying, three types of developers of different colors are sequentially supplied onto a photosensitive drum for each color of the developer, and then all at once onto transfer paper. However, in this case, the developer of the second and subsequent colors scrapes off the developer that was previously supplied onto the photosensitive drum, or mixes with the developer that was supplied earlier, causing color mixture. It has the disadvantage that it can occur.

Therefore, as shown in FIG.
When all the color developers a, a', and a'' are transferred onto the transfer paper d, the transfer paper d is transferred by the peeling claw e. There is one in which the developer is peeled off from the drum c and then the developer a, a', a'' is fixed onto the transfer paper d by a fixing device f. However, in this copying machine, the transfer drum c has an outer circumference equal to or longer than the length of the transfer paper d.
Therefore, not only is a large space occupied by the transfer drum c required, but there are also drawbacks such as high cost.

Purpose of the invention The present invention was devised based on the above-mentioned circumstances.The purpose of the invention is to provide a compact and inexpensive device that allows the developer to be supplied from the second time onwards to the developer that is supplied first. An object of the present invention is to provide an electronic copying machine that can prevent developer from being scraped off or mixed with previously supplied developer.

Summary of the invention In the present invention, at least two or more kinds of developers are sequentially supplied onto a developing area, and each time they are supplied, they are temporarily deposited and then transferred all at once onto a transfer target.

Embodiment of the invention Hereinafter, a first embodiment of the invention will be described with reference to FIG. FIG. 2 schematically shows an electronic copying machine that performs multicolor copying, and in this figure, reference numeral 1 denotes a photoreceptor as a drum-shaped developing portion that rotates in a predetermined direction. Around this photoreceptor 1, a first charging charger 2,
Exposure system 3, first developing device 4, second developing device 5, third developing device 6, second charging charger 7, transfer charger 8, temporary deposition device 9, cleaning device 10, static elimination charger 11, and static elimination A lamp 12 is arranged. In addition, the photoreceptor 1
and the transfer charger 8.
3 is a transfer path 15 for transfer paper 14 as a transfer target.
The transfer paper 1 that has passed through the transfer unit 13
4 is adapted to be ejected via a fixing device 16. Note that 17 is a peeling claw that peels off the transfer paper 14 from the photoreceptor 1.

The first charging charger 2 is designed to uniformly charge the surface of the photoreceptor 1.

The exposure system 3 has a filter switching mechanism 22 that selectively interposes a red, green or blue filter 19, 20, 21 on the exposure optical path 18,
The photoreceptor 1 is exposed to light that has passed through any one of these filters 19, 20, and 21 to form an electrostatic latent image.

The first, second and third developing devices 4, 5,
Reference numeral 6 denotes a developer of a different color, such as a cyan developer 23a, a magenta developer 23b, or a yellow developer 23c, which are sequentially supplied onto the photoreceptor 1 every rotation of the photoreceptor 1 to develop the electrostatic latent image. The developers 23a, 23b, and 23c of each color are superimposed on the photoreceptor 1.

The second charging charger 7 is connected to the developer 23a, 23b, 23 of each color superimposed on the photoreceptor 1.
c, for example, to a negative polarity and to be uniformly charged.

The transfer charger 8 has developer materials 23a, 23b, 23c of each color superimposed on the photoreceptor 1.
are transferred onto transfer paper 14 all at once.

The temporary attachment device 9 is used to attach the photoconductor 1 during rotation of the photoconductor 1.
It has a temporary fixing roller 24 which is in pressure contact with the photoconductor 1 and separates from the photoconductor 1 when the photoconductor 1 is stopped.
Each time the developer a, 23b, 23c is supplied onto the photoreceptor 1, only the surface of the developer 23a, 23b, 23c is temporarily deposited.

The cleaning device 10 removes the developer 23a that is not transferred to the transfer paper 14 and remains on the photoreceptor 1;
23b and 23c, which contacts the photoconductor 1 during cleaning and removes the photoconductor 1 during non-cleaning.
It is becoming more and more distant from the

The static elimination charger 11 and the static elimination lamp 12
is designed to eliminate static electricity on the photoreceptor 1.

The above-mentioned fixing device 16 is connected to the developer 23a, 23 of each color transferred onto the transfer paper 14 in a superimposed state.
b, 23c are fixed.

First, when the photoreceptor 1 starts rotating,
Uniformly charged by the first charging charger 2,
Then, in the exposure system 3, the image is exposed to light that has passed through the red filter 19, and electrostatic latent images corresponding to the green and blue image parts are formed. This electrostatic latent image is developed in the first developing device 4 by applying cyan developer 23a. Next, this developer image is not transferred by the transfer charger 8, but only its surface layer is temporarily deposited by the temporary deposition device 9, and then the static electricity is eliminated by the static elimination charger 11 and the static elimination lamp 12, and it is used for the next charging. be done. At this time, the cleaning device 10 is separated from the photoreceptor 1 and cleaning on the photoreceptor 1 is not performed.

Next, the photoreceptor 1 is similarly exposed to light that has passed through the green filter 20 in the exposure system 3 to form an electrostatic latent image corresponding to the red and blue image parts. In the second developing device 5, a magenta color developer 23b is applied and developed. At this time, the magenta developer 23b is superimposed on the cyan developer 23a that was deposited in the previous development, but since the surface of the cyan developer 23a is temporarily deposited, it is hardly scraped off. ,
Furthermore, the cyan developer 23a and the magenta developer 23b do not mix to cause color mixture. Next, the magenta developer image is similarly not transferred by the transfer charger 8, but only its surface layer is temporarily deposited by the temporary deposition device 9, and then the static electricity is eliminated by the static elimination charger 11 and the static elimination lamp 12. It is used for charging.

Next, the photoreceptor 1 is similarly exposed to light that has passed through the blue filter 21 in the exposure system 3 to form electrostatic latent images corresponding to the red and green image parts. In the third developing device 6, a yellow developer 23c is applied and developed. At this time as well, the yellow developer 23c is superimposed on the cyan developer 23a and magenta developer 23b that were deposited in the previous development, but the surfaces of the cyan developer 23a and magenta developer 23b are No scraping or color mixing occurs due to temporary adhesion. Next, the developers 23a and 23 of each of these colors are
b, 23c are superimposed and are uniformly charged to negative polarity by the second charging charger 7, and then transferred onto the transfer paper 14 by charging the transfer paper 14 to positive polarity by the transfer charger 8. The image is transferred and then fused in the fusing device 16, thus producing a multicolor copy. On the other hand, transfer paper 14
Developers 23a, 23b, and 23c that have not been transferred onto the photoreceptor 1 and remain on the photoreceptor 1 are removed by the cleaning device 10, which was separated, coming into contact with the photoreceptor 1.

In this way, three types of developer 23 with different colors are used.
a, 23b, and 23c are sequentially supplied onto the photoconductor 1 for each type of color, and are temporarily attached each time they are supplied, and then transferred all at once onto the transfer paper 14. This prevents the developer 23b or 23c supplied for the third or third time from scraping off the previously supplied developer 23a or 23b or mixing with the previously supplied developer 23a or 23b. It is possible to obtain good multi-color copies without color mixture etc. while being small and inexpensive. Moreover, since the temporary fixing roller 24 does not contact the photoreceptor 1 when the photoreceptor 1 is stopped, the photoreceptor 1 is not dented or crystallized.

In addition, in the first embodiment, the temporary fixing roller 2
4 is arranged so that it comes into contact with and separates from the photoreceptor 1, but it may be arranged so that it is always in pressure contact with the photoreceptor 1, as shown in the second embodiment shown in FIG. In this case, a non-photosensitive layer section 25 is provided at a specific portion of the photoconductor 1, and the photoconductor 1 is controlled to stop so that the temporary fixing roller 24 comes into pressure contact with the non-photosensitive layer section 25 of the photoconductor 1 when the photoconductor 1 is stopped. With this configuration, the photoreceptor 1
This prevents dents and crystallization from occurring.

Further, the temporary fixing roller 24 may have a built-in heat source to control fixing performance, and may be coated with Teflon coating, silicone oil, etc. to prevent developer from adhering to the surface. Of course.

Further, in the first and second embodiments described above, the temporary fixing device 9 is configured to include the temporary fixing roller 24, but the present invention is not limited to this, and the third embodiment shown in FIG. As in the fourth embodiment shown in FIG. 5, the developers 23a, 23b, and 23c may be temporarily attached using a hot wire. That is, the temporary fixing device 9 of the third embodiment is provided with a heat shield plate 27 that can be opened and closed between the heat ray generating section 26 and the photoreceptor 1 due to the rise of temperature characteristics, and the developer image on the photoreceptor 1 is The heat shield plate 27 is designed to open only when it reaches the temporary landing position. That is, the heat shield plate 27 is normally closed so as not to increase the temperature of the photoreceptor 1. Further, the temperature inside the temporary attachment device 9 is controlled to be kept constant at all times. According to the above configuration, since the temporary attachment device 9 does not contact the photoreceptor 1, the photoreceptor 1 is not dented and crystallization is less likely to occur. Moreover, developer 23
Since temporary adhesion of a, 23b, and 23c is performed by heat radiation, temporary adhesion is performed only on the surface of the developer layer on the photoreceptor 1, and fixing is not performed up to the contact surface between the photoreceptor 1 and the developer layer. On the other hand, the temporary attachment device 9 of the fourth embodiment has a quick thermal start-up and does not require a heat shield plate. In this case, in order to prevent crystallization of the photoconductor 1 facing the temporary attachment device 9 due to the amount of heat remaining in the temporary attachment device 9 when the photoconductor 1 is stopped, a specific portion of the photoconductor 1 has a thermal conductivity. The lower part is formed of a heat insulating material 28, for example, and is used as a temporary attachment device 9 when the photoreceptor 1 is stopped.
The photoreceptor 1 is controlled to stop so that it faces the heat insulating material 28.

Furthermore, in the above embodiment, the developer 2 of different color
3a, 23b, and 23c are used, but the present invention is not limited thereto, and it goes without saying that different types of developers may be used.

In the second, third, and fourth embodiments, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Effects of the Device As explained above, according to the present invention, in a device in which at least two or more types of developer are sequentially supplied onto a portion to be developed and then transferred all at once onto the object to be transferred, the developer is Since a temporary deposition device is provided that temporarily deposits the developer each time it is supplied onto the developing area, the developer supplied from the second time onwards on the carrier scrapes off the previously supplied developer. It is possible to prevent the developer from being mixed with the previously supplied developer, thereby making it possible to obtain good copies without color mixture etc. while being small and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional example, Fig. 2 is a block diagram showing a first embodiment of the present invention, Fig. 3 is a sectional view showing main parts of a second embodiment of the present invention, and Fig. The figure is a block diagram showing the third embodiment of the present invention, and FIG. 5 is a sectional view showing the main part of the fourth embodiment of the present invention. 1... Area to be developed (photoreceptor), 9... Temporary deposition device,
23a...Cyan color developer, 23b...Magenta color developer, 23c...Yellow color developer, 24...
...temporary arrival roller.

Claims (1)

[Claims for Utility Model Registration] (1) After sequentially supplying at least two or more types of developer onto a cylindrical developing area, the polymerized developer is applied all at once onto the transfer area. In the device for transferring, there is provided a temporary adhesion device that temporarily deposits the developer on the to-be-developed area each time the developer is supplied onto the to-be-developed area; An electronic copying machine comprising a fixing device for fixing a developer image onto a transfer target. (2) The electronic copying machine according to claim 1, wherein the temporary fixing device has a temporary fixing roller that presses against the developing area. (3) The electronic copying machine according to claim 1, wherein the temporary attachment device is configured to temporarily attach the developer using heat rays.