JP2000227748A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a power source unit to be detached at the back surface side of a device main body. SOLUTION: A power source device 50 is constituted by fitting a DC power source 52, a high voltage power source 53 and an image processing board 54 to a base plate 51 fitted between side plates 9a and 9b so that it can be opened and closed. The power sources 52 and 53 are fitted to the inside of the device main body and the board 54 is fitted to the outside. The plate 51 is fitted to the plate 9a with a hinge so that it can be turned to be opened and closed. When the plate 51 is closed, a laser writing system unit is covered with the power sources 52 and 53. However, the power sources 52 and 53 covering the laser writing system unit can be eliminated only by turning the plate 51. Thus, the laser writing system unit 5 can be accessed by the hand of a worker and also easily pulled outside the device from the front surface side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a printer, a copying machine, a facsimile, and the like.

[0002]

2. Description of the Related Art In an electrophotographic image forming apparatus, a power supply portion of a power supply device, that is, a DC power supply unit or a high voltage power supply is provided on the rear side of the apparatus main body. There is a configuration in which a laser writing unit is arranged at a position on the front side of the apparatus main body from below the power supply. In other words, this is because the laser writing unit can irradiate the photosensitive member, which is the image bearing member, with laser light from obliquely below.

However, if such an arrangement of the devices is adopted, the power supply unit and the high-voltage power supply inevitably protrude above the laser writing unit, and when the laser writing unit is to be operated in maintenance work or the like, the power supply unit or the like hinders operation. Problem arises. In other words, the power supply unit and high-voltage power supply cannot be easily removed from the main body of the device.On the other hand, since there is only a clear space from the front side of the main body where the process cartridge unit can be removed, it is necessary to insert and remove the hand. This is because the power supply unit and the like have to be removed after all. In recent years, since an image processing board has been increasingly mounted, it has become more troublesome to perform a detaching operation on the rear side of the apparatus main body, and a solution to the above-described problem has been demanded.

The present invention has been made in view of the above-mentioned conventional problems,
An object of the present invention is to provide an image forming apparatus in which a power supply unit and the like can be easily removed from the rear side of the apparatus main body.

[0005]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: a power supply unit provided on a rear side of a main body of the apparatus; A DC power supply unit and a high voltage power supply are attached to a base member and integrated in an image forming apparatus in which a writing unit is disposed from a lower portion to a front portion of the apparatus main body, and the base member is moved in the integrated state. Thus, the back side of the apparatus main body can be opened and closed.

According to a second aspect of the present invention, the base member is mounted on a rear opening of the apparatus main body so as to be openable and closable like a door.

According to a third aspect of the present invention, the DC power supply unit and the high-voltage power supply are mounted on the inner surface of the apparatus body of the base member, and the image processing board is mounted on the outer surface.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a color printer as an example of an image forming apparatus according to an embodiment of the present invention.
1 is a side view, FIG. 2 is a schematic center sectional view, and FIG. 3 is a rear view. In the illustrated apparatus, reference numeral 1 denotes a photosensitive belt made of a flexible belt serving as a belt-shaped image carrier, and is provided between the rotating rollers 2 and 3. Transport clockwise. 4 is a charging charger as charging means, 5 is a laser writing system unit as image exposure means, 6 is three developing means containing yellow, magenta, and cyan color developers, that is, a rotary type color developing device. The developing unit 6 is a black developing unit that is a developing unit that stores a black developer separately provided. The laser writing system unit 5 is housed in a holding housing provided with a slit-shaped exposure opening 5B on the upper surface and is incorporated in the lower part of the apparatus main body. Further, a main body frame 9 serving as a stationary housing of the apparatus main body for supporting each unit is assembled. Each of the color developing device 6 and the black developing device 7 includes a developing roller which comes close to or in contact with the photosensitive belt 1 at a predetermined position, and develops a latent image on the photosensitive belt 1 by non-contact development or contact development. Visualize.

In FIG. 1, reference numeral 10 denotes an intermediate transfer belt, which is an intermediate transfer member.
12 and is arranged in an inclined manner, and the rotating roller 1
The sheet is conveyed counterclockwise in FIG. The lower portion of the inclined belt surface of the intermediate transfer belt 10 is in contact with the rotating roller 3 of the photoreceptor belt 1, and a visible image on the photoreceptor belt 1 is used as a bias brush provided inside the intermediate transfer belt 10. The image is transferred onto the intermediate transfer belt 10 by the reference numeral 13. By repeating this process sequentially and in the same manner, the first and subsequent times, the second time, the third time, and the fourth time, the developed images on the photosensitive belt 1 are shifted on the intermediate transfer belt 10 respectively. The transfer is performed in an overlapping manner so as not to occur. A transfer roller 14 as a secondary transfer member is provided above the rotation roller 11 so as to be in contact with and separated from the intermediate transfer belt 10.

In the drawing, reference numeral 15 denotes a cleaning blade 1
A cleaning device including the intermediate transfer belt 1;
0 cleaning device. A waste toner collecting container 36 is provided below the cleaning device 15. The cleaning blade 16A of the cleaning device 16 is kept at a position separated from the surface of the intermediate transfer belt 10 during image formation, and is brought into pressure contact with the surface of the intermediate transfer belt 10 as shown in FIG. 16B in the figure
Indicates an auger in the cleaning device 16.

An image forming process by the color printer will be described. First, the laser writing unit 5
Is exposed on the circumference of the photoreceptor belt 1 uniformly charged in advance by the charging charger 4 to form an electrostatic latent image. Here, the image pattern to be exposed is a single-color image pattern when a desired full-color image is separated into yellow, magenta, cyan, and black. The formed electrostatic latent images of the three colors are developed by rotating the rotary type color developing device 6 so that the yellow, magenta and cyan developing units are successively opposed to the photoreceptor belt 1 to be developed and made monochromatic. A single color image is formed. The black electrostatic latent image is developed by a black developing device 7, and is developed and made monochromatic to form a monochromatic image. The monochrome image formed on the photoreceptor belt 1 is sequentially superimposed and transferred onto an intermediate transfer belt 10 rotating counterclockwise while contacting the photoreceptor belt 1. Yellow superimposed on the intermediate transfer belt 10,
The magenta, cyan, and black images are fed from a paper feed cassette 17 to a paper feed roller 18, a transport roller 19, and a registration roller 20.
Is transferred to the transfer paper conveyed to the transfer section by the transfer roller 14. After the transfer is completed, the image is fixed on the transfer paper by the fixing device 21 to complete a full-color image.

The fixing device 21 includes a heating roller 21a and a pressure roller 21b. The transfer paper after image transfer is sandwiched between the heating roller 21a and the pressure roller 21b, and is pressed and heated to form a toner image. Fix to transfer paper. After the image is fixed, the transfer paper is discharged onto a paper discharge unit 23 via a paper discharge roller 22.

Next, the configuration of the apparatus main body will be described. As a device main body structure, a main body frame 9 as an immovable portion housing is used.
And a front frame 8 serving as a front housing capable of opening a transfer paper transport path. A paper feed cassette 17 is disposed below the main body frame 9, and each device is disposed so as to be replaceable in a central portion. Further, a fixing device 21 is disposed above the sheet, and a sheet discharge section 23 is formed above the fixing device 21. Further, a duct 2 is provided below the inside of a portion of the front frame 8 adjacent to the upper cover 25.
6, an exhaust device 30 including a fan 27 and a guide cover 28 is provided.

A power supply 50 is housed on the left side of the figure, that is, inside the rear side of the main body frame 9. The configuration of the power supply device 50 is shown in FIGS. FIG. 4 is a schematic perspective view showing a state where the power supply device 50 is opened from the main body frame 9, and FIG. 5 is a schematic plan view showing a state where the power supply device 50 is attached to the main body frame 9. The power supply device 50 has a base plate 51 mounted in a door shape that can be opened and closed between a pair of side plates 9a and 9a constituting the main body frame 9, and a DC power supply 52, a high-voltage power supply 53, and an image processing board 54 are mounted on the base plate 51. It is. Specifically, the DC power supply 52 and the high voltage power supply 5
Reference numeral 3 is attached to the inside of the main body of the base plate 51, and the image processing board 54 is attached to the outside. In the figure, 55 and 55 are hinges, and the base plate 51 is a hinge 55 and 55.
Can be attached to one side plate 9a, and can be opened and closed around a hinge 55 as a rotation center. Although not shown in detail, the other side plate 9a
a can be temporarily fixed. As the base plate 51, for example, a bent sheet metal member or the like is suitable.

Therefore, when the base plate 51 is closed, the DC power supply 52 and the high-voltage power supply 53 are put on the laser writing unit 5 between the side plates 9a and 9a. In the figure, reference numeral 5B denotes the above-mentioned exposure opening for irradiating the photoreceptor belt 1 with the laser beam 5A, and this side is the front side of the apparatus as can be seen from FIG.

In this state, only by rotating the base plate 51 about the hinge 55 as the center of rotation and opening the space between the side plates 9a, 9a, there is no object over the laser writing system unit 5 and the laser writing system can be easily replaced. The operator can access the unit 5 by hand. Of course, there are some wirings connected to the DC power supply 52, the high voltage power supply 53, and the image processing board 54, and they need to be appropriately removed before and after opening the base plate 51. Then, when a process cartridge unit (specific illustration is well-known and is omitted since it is well-known) including the photoreceptor belt 1 and the intermediate transfer belt 10 is removed, the exposure opening of the laser writing unit 5 from below the color developing unit 6. Since a gap is formed to the extent that the portion 5B and its peripheral portion can be seen, after removing the wiring on the back side of the apparatus main body, if necessary, push the laser writing system unit 5 slightly to the front of the apparatus. Then, it is pulled out of the apparatus from the above-mentioned gap.

[0017]

As described above, in the image forming apparatus according to the present invention, the DC power supply unit and the high-voltage power supply are attached to the base member and integrated, and the base member is moved in that state, and the rear surface of the apparatus main body is moved. The back side can be opened and closed, so the back side of the main unit can be opened very easily, the internal writing unit can be easily accessed, and the writing unit can be easily removed from the front side of the main unit. Has the effect of becoming

[Brief description of the drawings]

FIG. 1 is a side view showing a color printer according to an embodiment of the present invention.

FIG. 2 is a schematic center sectional view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a schematic perspective view showing a state where the power supply device of the device shown in FIG. 1 is opened from a main body frame.

FIG. 5 is a schematic plan view showing a state where the power supply device of the device of FIG. 1 is attached to a main body frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photoreceptor belt 2, 3 Rotating roller 4 Charging charger 5 Laser writing system unit 5A Laser beam 5B Exposure opening 6 Color developing device 7 Black developing device 8 Front frame 9 Main frame 9A Side plate 10 Intermediate transfer belt 11, 12 times Moving roller 13 Bias brush 14 Transfer roller 15 Photoreceptor belt cleaning device 15A Cleaning blade 16 Intermediate transfer belt cleaning device 16A Cleaning blade 16B Auger 17 Paper feed cassette 18 Paper feed roller 19 Transport roller 20 Registration roller 21 Fixing device 21a Heating roller 21b Pressure roller 22 Discharge roller 23 Discharge section 25 Upper cover 26 Duct 27 Fan 28 Guide cover 30 Air exhaust device 50 Power supply device 51 Base plate 52 DC power supply 53 High voltage 54 image processing board 55 hinge

Claims (3)

[Claims] 1. An image forming apparatus comprising: a power supply portion of a power supply device provided on a back side of an apparatus main body; and a writing unit disposed at a position below the power supply portion and on a front side of the apparatus main body. An image forming apparatus, wherein a high-voltage power supply is attached to a base member and integrated, and the base member is moved in the integrated state so that the back side of the apparatus main body can be opened and closed. 2. An image forming apparatus according to claim 1, wherein said base member is attached to an opening on the back side of said apparatus main body so as to be openable and closable in a door shape. 3. The image forming apparatus according to claim 1, wherein the DC power supply unit and the high-voltage power supply are mounted on an inner side surface of the apparatus main body of the base member, and an image processing board is mounted on an outer side surface. .