KR100322560B1 - Developing unit of image forming device - Google Patents

Abstract

PURPOSE: A developing unit of an image forming device is provided to prevent the unnecessary consumption of a developing unit by making partial change of color developing units possible. CONSTITUTION: Developing units separately storing yellow, magenta, cyanine and black developers are installed in a laser scanning unit. The developing unit includes a developer roller, a cleaning roller, first and second squeeze rollers(32,33), first and second blades, and a reservoir. Herein, the developing unit for separately storing the developer of black color is installed to drive independently. Since the developing unit for the black developer is driven separately, the independent change of the black developer unit is possible.

Description

Developing apparatus of image forming apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing apparatus of an image forming apparatus, and more particularly, to a developing apparatus of an image forming apparatus having an improved structure such that some developing apparatuses among a plurality of developing apparatuses that implement various colors can be operated independently.

In general, an image forming apparatus used for a printer or a copying machine forms a latent electrostatic image on a photosensitive medium such as a photosensitive drum or a photosensitive belt, develops the electrostatic latent image area with a developer having a predetermined color, and then contacts the photosensitive medium. And a printing sheet is passed between the rotating rollers to obtain a desired image.

As shown in FIG. 1, the conventional image forming apparatus 10 is provided with a transfer backup roller 11a, a steering roller 11b, and a driving roller 11c. On the rollers 11a, 11b and 11c, a photosensitive belt 12 rotatable on an infinite track is provided. The image forming apparatus 10 applies an electric potential on an erasure lamp 13 for erasing the image information in the previous step and a photosensitive belt 12 passing through the erasure lamp 13. Electricity 14.

One side of the photosensitive belt 12 includes a plurality of laser scanning units 15 for scanning light corresponding to the input image information, and yellow (Y) and magenta for printing images of various colors. A plurality of developing apparatuses 16a, 16b, 16c, and 16d are provided, in which developer solutions of (M), cyan (C) and black (BK) colors are separately stored. In addition, the driving roller (11c) side is equipped with a drying roller 17 to remove the liquid carrier (liquid carrier) contained in the developer remaining on the photosensitive belt 12.

Meanwhile, a transfer roller 18 is installed on the transfer backup roller 11a with a photosensitive belt 12 interposed therebetween, and the transfer roller 18 pressurizes the printing paper 20 to pressurize the printing roller 19. ) Is engaged and rotates.

Here, the developing devices 16a, 16b, 16c, and 16d have a developing roller 21, a primary squeegee roller 22, a secondary squeegee roller 23, and a cleaning roller. (24), first and second blades 25 and 26 for removing the developer remaining in the first and second squeegee rollers 22 and 23, and a reservoir for storing the developer. It includes.

That is, as shown in Figure 2, the conventional developing apparatus is provided with a plurality for the combination of the developer having a Y, M, C, BK color, the developing roller 21 provided in each developing apparatus, and the first The secondary squeegee rollers 22, 23, etc. are rotatably coupled to the support member 210 of the rotation shaft thereof. The support member 210 is provided with a plurality of bearing parts 220 on one surface.

In addition, the developing apparatus including the developing roller 21, the first and the first and second squeegee rollers 22, 23, and the like are supported by the support member 210 and mounted on the frame 230 so as to be detachable at the same time. The frame 230 is an integral structure in which spaces are formed to accommodate developing devices of Y, M, C, and BK colors.

Sliders 240 are mounted on both side portions of the frame 230. The slider 240 is formed with a bearing guide portion 250 that can be transferred on the bearing portion 220. In addition, a guide pin 260 is installed on one surface of the slider 240 to be selectively coupled to a cam part (not shown) to perform a linear reciprocating motion of the slider 240.

The conventional image forming apparatus 10 configured as described above scans the corresponding light from each laser scanning device 15 to the photosensitive belt 12 having the electrostatic latent image region. Subsequently, the developing devices 16a, 16b, 16c, and 16d, which store developer in Y, M, C, and BK colors, apply the developer in which the toner and the liquid carrier are mixed to the electrostatic latent image area.

Then, the liquid carrier remaining in the photosensitive belt 12 is removed by the drying roller 17, and the image is transferred to the transfer roller 18. Then, image information is printed while the printing paper 20 passes between the transfer roller 18 and the pressure roller 19.

Here, referring to the operation process of the conventional developing apparatus, first, the guide pin 260 in contact with it by the operation of the cam unit is selectively coupled, accordingly, the slider 240 is a linear reciprocating motion.

Subsequently, the bearing guide part 250 of the slider 240 moves along the bearing part 220 supported on the lower surface thereof. As such, as the slider 240 moves, the frame 230 in which the developing devices of Y, M, C, and BK colors are mounted is moved up and down, so that the developer can be applied onto the photosensitive belt 12. do.

However, the conventional developing apparatus is mounted in the space provided in the integrated frame 230 in which the developing apparatuses of Y, M, C, and BK colors correspond to each other, so that the bearing guide unit 250 may support the bearing unit 220. Guided along the slider 240 is a structure for lifting and lowering at the same time when the linear reciprocating motion. Therefore, when lifting up a plurality of developing devices, a large load is applied. In addition, although BK color developing devices are used more than other color developing devices, when developing a BK color developing device, the developing devices of Y, M, and C colors, which are integrated, are replaced at the same time, resulting in excessive waste. Come.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a development apparatus of an image forming apparatus having an improved structure such that a developing apparatus of some of the plurality of developing apparatuses of Y, M, C, and BK colors can be driven independently. The purpose is to provide.

1 is a schematic block diagram of a conventional image forming device,

2 is a perspective view of a conventional developing apparatus,

3 is a perspective view of a developing apparatus according to an embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

10,100. Image forming apparatuses 11a and 110a. Transfer Backup Roller

11b, 110b. Steering roller 11c, 110c. Driving roller

12,120. Photosensitive belt 13,130. Eraser Lamp

14,140. Charger 15,150. Laser injection device

16a, 16b, 16c, 16d. Developer 17,170. Drying Roller

18,180. Transfer Roller 19,190. Press Roller

20,200. Printing paper 21,31,31a, 31b. Developing Roller

22,32. First squeegee roller 23,33. 2nd squeegee roller

24,34. Cleaning roller 25,35. First blade

26,36. Second blade 160a, 160b, 160c, 160d. Developing equipment

210,310. Support member 220,320. Bearing

230.Frame 240.Slider

250,350. Bearing guide part 330a. First frame

330b. Second Frame 340. First Slider

370. Second Slider

In order to achieve the above object, a developing apparatus of an image forming apparatus according to an aspect of the present invention includes a plurality of frames including a first frame and a second frame; First developing means coupled to the first frame to develop a development region of yellow, magenta, and cyan color in the electrostatic latent image region formed on the photosensitive belt; And second developing means coupled to the second frame to develop a black color developing region in the electrostatic latent image region formed on the photosensitive belt.

The first developing means may include a plurality of first developing rollers for developing a developing area of yellow, magenta, and cyan colors coupled to the first frame, and may be rotatably installed at both ends of the respective roller rotation shafts. And a first slider supporting a first support member and a plurality of bearing guide portions slidable on respective bearing portions provided on the first support member.

Here, the second developing means includes a second developing roller for developing a black developing region coupled to the second frame installed adjacent to the first frame, and installed at both ends of the roller rotation shaft so as to be rotatable. And a second slider having a second support member for supporting and a bearing guide portion slidable on each bearing portion provided in the second support member.

Hereinafter, a developing apparatus of an image forming apparatus according to an exemplary embodiment will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, in the image forming apparatus 100 according to an exemplary embodiment, the transfer backup roller 110a, the steering roller 110b, and the driving roller 110c are disposed in a triangular shape. On the rollers 110a, 110b and 110c, a photosensitive belt 120 rotatable on an infinite track is provided. One side of the photosensitive belt 120 is an erasure lamp 130 for erasing the image information in the previous step, and a charger for applying a potential on the photosensitive belt 120 passing through the erasure lamp 130 ( 140 are respectively installed.

Then, a plurality of laser scanning devices 150 for scanning light corresponding to the input image information are installed on the photosensitive belt 120 side passing between the steering roller 110b and the driving roller 110c. In addition, the laser scanning device 150 is provided with a plurality of developing devices 160a, 160b, 160c, and 160d separately storing and storing Y, M, C, and BK colors for various color combinations. . The driving roller 110c is equipped with a drying roller 170 for drying it to remove the liquid carrier contained in the developer attached to the photosensitive belt 120.

On the other hand, the transfer backup roller (110a) is coupled to each other and the transfer roller 180 to transfer the image information transferred from the photosensitive belt 120, the transfer roller 180 is pressurized printing paper 200 The pressure roller 19 is engaged to rotate so that printing is possible.

Here, the developing apparatuses 160a, 160b, 160c, and 160d may include a developing roller 31 for applying a developer to the photosensitive belt 120 and a developer attached to a rear surface of the developing roller 31. Cleaning roller 34, first and second squeegee rollers 32 and 33 for removing the developer remaining on the photosensitive belt 120, and the first and second squeegee rollers 32 and 33 First and second blades 35 and 36 to remove the developer adhered to the, and a reservoir 37 for storing the developer.

3 illustrates a developing apparatus employed in such an image forming apparatus 100.

Referring to the drawings, the developing roller 31a, the first and the first and second squeegee rollers 32, 33, and the like, which are provided in the developing apparatus having Y, M, and C colors, are one of a plurality of frames 330a, 330b. Is mounted on the frame. That is, the developing roller 31a which is detachably integrally mounted on the first frame 330a, and the first and second squeegee rollers 32 and 33 are installed at positions adjacent to the developing roller 31a. In addition, although not shown in the drawing, the first frame 330a is equipped with a cleaning roller and first and second blades.

The developing roller 31a and the first and second squeegee rollers 32 and 33 are rotatably coupled to the support member 310. A plurality of bearing parts 320 are installed on one surface of the support member 310. In addition, a first slider 340 is coupled to both side portions of the first frame 330a, and the first slider 340 is provided with a bearing guide portion 350 that is transferable on the bearing portion 32. . In addition, a guide pin 360 is installed on one surface of the first slider 340 to selectively linearly reciprocate the first slider 340 by being coupled to a cam portion (not shown).

According to a feature of the invention, a developing device for separating and storing a developer of BK color is installed to be independently driven. That is, the second frame 330b is provided in close proximity to the first frame 330a. A developing roller 31b for developing a developer of BK color is mounted on the second frame 330b. First and second squeegee rollers 32 and 33 are respectively provided at positions adjacent to the developing roller 31b as in the case of the developing apparatus for developing the Y, M, and C colors.

In addition, the developing roller 31b and the first and second squeegee rollers 32 and 33 are rotatably installed on the support members 310 provided at both ends of the rotation shaft. The bearing member 320 is installed on the support member 310. In addition, a second slider 370 is installed at a position adjacent to the first slider 340, and the bearing portion 320 contacts the bottom surface of the bearing guide portion 380 formed on the second slider 370. have.

On the other hand, one surface of the second slider 370 is selectively coupled to a cam unit provided separately like the first slider 340 for lifting and lowering a developing device for developing Y, M, and C colors, and thus the second slider 370. Guide pins 390 for reciprocating are installed.

The developing apparatus of the image forming apparatus according to the present invention configured as described above applies the developer on the photosensitive belt 120 having the electrostatic latent image region formed thereon. That is, the developing rollers 31a and 31b of Y, M, C, and BK colors respectively installed on the first and second frames 330a and 330b are mixed with toner and liquid carrier on the photosensitive belt 120. The developed developer is applied. Subsequently, the developer remaining on the photosensitive belt 120 is removed by the first and second squeegee rollers 32 and 33.

Here, the developing roller 31a of the Y, M, and C colors and the developing roller 31b of the BK color are independently driven by different cam parts. That is, the Y, M, C developing roller 31 a and the BK developing roller 31 b according to the operation of the cam portion in contact with the guide pins 360 and 390 formed on the first and second sliders 340 and 370. Works optionally. Accordingly, the first and second sliders 340 and 370 perform a linear reciprocating motion.

Subsequently, the bearing guide parts 350 of the first and second sliders move along the bearing part 320 supported on the lower surface thereof. As such, as the first and second sliders 340 and 370 move, the first frame 330a and the second frame 330b equipped with the developing devices of Y, M, C, and BK colors are moved up and down. The developer is applied onto the photosensitive belt 120.

As described above, the developing apparatus of the image forming apparatus of the present invention can reduce the heavy load by separately driving the developing apparatus for developing the Y, M, C colors and the BK colors, and only the BK color developing apparatus is mainly used. Since it is replaceable, unnecessary consumption of developing device can be eliminated.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (3)

A plurality of frames having a first frame and a second frame; First developing means coupled to the first frame to develop a development region of yellow, magenta, and cyan color in the electrostatic latent image region formed on the photosensitive belt; And And a second developing means coupled to the second frame to develop a black developing area in the electrostatic latent image area formed on the photosensitive belt. The method of claim 1, The first developing means includes a plurality of first developing rollers for developing a developing area of yellow, magenta, and cyan colors coupled to the first frame, and rotatably supported at both ends of the respective roller rotation shafts. And a first slider having a first support member and a plurality of bearing guide portions slidable on respective bearing portions provided on the first support member. The method of claim 1, The second developing means includes a second developing roller for developing a black developing region coupled to a second frame installed adjacent to the first frame, and installed at both ends of the roller rotation shaft to rotatably support it. And a second slider having a second support member and a bearing guide portion slidable on each bearing portion provided on the second support member.