JPH09292805A - Fan for color image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide as fan for a color image forming apparatus, which can reduce the manufacturing cost and noise by the improvement of the efficiency of the fan. SOLUTION: Four suction ports 25 of a duct 19 for discharging ozone, etc., to the outside of an apparatus are opened around four drums 11. The duct 19 is L-shaped, and the cross-flow fan 18 is placed in the corner. A filter 17 is mounted on the base part of the suction port 25 of the duct 19. Air flow enters the duct 19 from the drums 11 to reach the cross-flow fan 18 and the direction of exhaustion is changed efficiently to a downward one by the cross- flow fan 18. Ozone, dust, etc., produced around the drums 11 is collected by the duct 19, removed by the filter 17 and discharged to the outside of the apparatus by the cross-flow fan 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for a color copying machine having a plurality of drums.

[0002]

2. Description of the Related Art A constant amount of fresh air is always required to be supplied to a peripheral portion of a drum which requires a charging process by a corotron or a scorotron. For example, Japanese Patent Laid-Open No. 2-9
The technique disclosed in Japanese Patent No. 3554 includes a cooling fan that sucks and blows air in the apparatus body, and an exhaust duct that exhausts the air blown from the cooling fan from an outlet on the back surface of the apparatus body. In addition, JP-A-4-4546
The technique disclosed in Japanese Patent Publication No. 5 is provided with cooling means for forcibly cooling the image end holding bodies of the plurality of image forming means. Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 4-174468, by providing a plurality of recesses in the width direction of the static eliminator, an air passage is secured from the opening of the casing of the charging device, ozone retention is prevented, and image quality by ozone is improved. This prevents defects and deterioration of the image holder. Further, in the technique disclosed in Japanese Patent Laid-Open No. 6-317, a plurality of slits that disperse the bias of the ozone concentration distribution is provided in front of the ozone filter suction port to make the ozone concentration distribution on the opening surface of the ozone filter uniform and The endurance performance is improved.

The basic structure of a color copying machine having a plurality of drums is shown in FIG. In the figure, 1 is a scanner unit, 2 is a writing unit, 3 is around a drum, 4 is a developing unit, 5 is a transfer unit, 6 is a fixing unit, 7 is a cleaning unit, 15 is a fixing cooling fan, and 17 is a filter. The drum periphery 3, the developing unit 4, and the cleaning unit 7 are provided in four units each. FIG. 2 shows main fans and air flows in the copying machine shown in FIG.
In the figure, 8 is a charging fan, 9 is a charging charger, 10 is dustproof glass, 11 is a drum, 12 is a scanner cooling fan,
14 is an IPU cooling fan, 15 is a fixing cooling fan, 16
Is a P sensor.

As shown in FIG. 3, a plurality of charging fans 8 corresponding to the plurality of drums 11 and a duct 12 for guiding air to the periphery of the drums 11 are provided, and the air flow around the drums in such a device is It is guided to the inside of the cover on the front surface of the duct 12 and again to the fixing cooling fan 15, and the filter 17 removes ozone, dust, etc. and discharges it to the outside of the machine.

That is, an image forming apparatus such as the above-mentioned color copying machine having a plurality of drums 11 in order to constantly supply a constant amount of fresh air to the peripheral portion of the drum which requires a charging process by a corotron or a scorotron. In the past, however, individual drums were provided with dedicated fans and ducts. However, with such a configuration, the cost is high and maintenance is troublesome. Further, in recent years, there has been an increasing demand for noise reduction of OA equipment, but since notches for intake or discharge are provided in the exterior parts near a plurality of fans, respectively, it also leads to an increase in noise.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a blower for a color image forming apparatus, which can reduce the cost and noise by improving the efficiency of the fan.
It is another object of the present invention to provide an air blower for a color image forming apparatus which can achieve easy filter replacement, improved filter installation and efficient use.

[0007]

According to a first aspect of the present invention, there is provided a color image forming apparatus in which a plurality of drums are arranged in line, and the air is generated from the periphery of each drum. A feature is that ducts for discharging ozone and the like are collectively formed, the ducts are formed in an L shape, and a cross flow fan is arranged at a corner portion thereof.

According to the second aspect of the present invention, a filter is provided between the plurality of inlets and the fan, the duct is partially cut out to take the filter out of the machine, and the exterior cover is an extension thereof. It is characterized by cutting out.

According to the third aspect of the present invention, the wind direction plates for controlling the flow of air from a plurality of suction ports are provided in front of and behind the filter, and the filter is supported by the wind direction plates. To do.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It should be noted that, in the following, the portions common to the conventional ones will be denoted by the common reference numerals, and overlapping description will be omitted.

FIG. 4 is a perspective view of an essential part showing an embodiment of a blower for a color image forming apparatus according to the present invention, and FIG. 5 is a sectional view of the same. The apparatus of the present embodiment is a duct 19 for discharging ozone and the like generated around the four drums 11 to the outside of the machine.
Of the four suction ports 25 ... Are formed around the drum 11 and the duct 19 is formed in an L shape.
The cross flow fan 18 is arranged at the corner. A fan motor 20 for the cross flow fan 18 is provided outside the duct 19. That is, the corner portion of the duct 19 also serves as the casing of the cross flow fan 18.

Further, as shown in FIG. 5, a small filter support 21 which also serves as an exterior cover is attached to a cover 22 covering the duct 19 above the base of the suction port 25 of the duct 19. The filter 17 can be supported and fixed in the casing 19, and the screw 23 can be removed to take out the filter support 21 together with the filter 17 to the outside of the machine.

In such a structure, the air flow is opposite to that of the conventional example described above, and enters the duct 19 from the drum 11 and reaches the cross flow fan 18. That is, the direction of exhaust air is efficiently changed to the downward direction by the cross flow fan 18, and the noise of the cross flow fan 18 is less likely to be emitted outside the machine. Ozone, dust, etc., generated around the drum 11 are collected in the duct 19 and the filter 1
It is removed by 7 and is discharged to the outside by the cross flow fan 18.

FIG. 6 is a perspective view of an essential part corresponding to FIG. 4, showing another embodiment of the blower of the color image forming apparatus according to the present invention,
FIG. 7 is a sectional view of the same. In this embodiment, the filter 1
The wind direction plates 24 are formed in the front and rear of the filter 7, and the distance between them is set to be substantially the width of the filter 17, so that the filter 17 is prevented from being displaced in the front and rear, and the filter 17 is attached so that the wind is evenly applied to increase the efficiency. The angle is adjusted. Other configurations and operations are similar to those of the previous embodiment.

[0015]

As described above, in the air blower for the color image forming apparatus according to the first aspect of the present invention, a plurality of air blow paths are collected to arrange the cross flow fan at the corner of the L-shaped duct. Since the wind direction can be efficiently changed by the cross flow fan and multiple fans are not required, it is inexpensive and the wind outlet can be installed downwards, preventing fan noise from going outside the machine. There is an effect that can be done.

As described above, in the blower of the color image forming apparatus according to the second aspect of the present invention, the filter provided between the plurality of inlets of the duct and the cross flow fan is provided on a part of the duct and its extension. Since the exterior cover of the can be cut out and taken out of the machine, in addition to the above common effects, when removing the large exterior cover when replacing the filter,
The effect is that it can be easily done without disassembling the duct unit.

As described above, in the blower of the color image forming apparatus according to the third aspect of the present invention, the wind direction plates that control the flow of air from the plurality of inlets are provided before and after the filter to support the filter. So, in addition to the above common effects,
There is an effect that the filter can be fixed, and the efficiency of the filter can be improved by uniformly blowing the air on the filter.

[Brief description of drawings]

FIG. 1 is a sectional view showing the basic configuration of a color copying machine having a plurality of drums.

FIG. 2 is a perspective view showing main fans and airflows in the copying machine of FIG.

FIG. 3 is an enlarged perspective view showing the periphery of the drum of FIG.

FIG. 4 is a main part perspective view showing an embodiment of a blower of the color image forming apparatus according to the present invention.

FIG. 5 is a sectional view of the same.

FIG. 6 is a main part perspective view showing another embodiment of the blower of the color image forming apparatus according to the present invention.

FIG. 7 is a sectional view of the same.

[Explanation of symbols]

 1 Scanner Unit 2 Writing Unit 3 Drum Surrounding 4 Developing Unit 5 Transfer Unit 6 Fixing Unit 7 Cleaning Unit 8 Charging Fan 9 Charging Charger 10 Dustproof Glass 11 Drum 12 Scanner Cooling Fan 14 IPU Cooling Fan 15 Fixing Cooling Fan 16 P-sensor 17 Filter 18 Cross Flow Fan 19 Duct 20 Fan Motor 21 Filter Support 22 Cover 24 Wind Direction Plate 25 Duct Suction Port

Claims (3)

[Claims] 1. In a color image forming apparatus in which a plurality of drums are arranged in an array, ducts for discharging ozone and the like generated around the respective drums to the outside of the machine are collectively formed, and the ducts are formed in an L shape. In addition, a blower for a color image forming apparatus is characterized in that a cross flow fan is arranged at the corner thereof. 2. A filter is provided between a plurality of inlets of the duct and the cross flow fan, a part of the duct is cut out in order to take the filter out of the machine, and an exterior cover on an extension thereof is provided. The blower for the color image forming apparatus according to claim 1, wherein the blower is notched. 3. A color image according to claim 2, wherein wind filters for controlling the flow of air from a plurality of inlets are provided in front of and behind the filter, and the filters are supported by the wind plates. Blower of forming device.