JP3574737B2 - Image forming device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus that controls circuits of different systems, such as a video circuit, a motor drive circuit, and a sensor detection circuit, with one power supply unit and a control board.
[0002]
[Prior art]
Conventionally, as a countermeasure against noise, in particular, a countermeasure against unnecessary radiation of a radiated electromagnetic field, a power supply and a ground are fixed in a single board either to be separated for each circuit system or to be all the same. . For example, even in the related art of the unnecessary radiation, even in the attached technology that is the content related to a few power supply lines, the filter is still inserted in the AC power input line.
[0003]
[Problems to be solved by the invention]
By the way, as a countermeasure against noise, especially as a countermeasure against unnecessary electromagnetic radiation, a method of separating a power supply and a ground for each circuit system may be effective in one operation mode but not always good in another operation mode. In order to do so, it was necessary to include other measures. Therefore, the cost increase due to unnecessary radiation countermeasures has increased as the system became more complicated.
[0004]
Therefore, a first object of the present invention is to provide an image forming apparatus that is more safe for the human body of a user by preventing radiation to a level higher than a standard value of unnecessary radiation.
A second object of the present invention is to provide an image forming apparatus which does not automatically emit unnecessary radiation according to an operation mode.
A third object of the present invention is to provide an image forming apparatus capable of avoiding an adverse effect caused by factors other than unnecessary radiation due to an environment unlikely to be increased by the switching function. .
A fourth object of the present invention is to provide an image forming apparatus which can be set in the best state as a measure against unnecessary radiation by the country since applicable standards of the unnecessary radiation vary from country to country.
A fifth object of the present invention is to provide an image forming apparatus provided with protection for dealing with an exceptional area in the same country.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, in an image forming apparatus in which circuits of different systems are controlled by one power supply unit and a control board, a plurality of switches for separating / connecting a power supply and a ground via a filter for each circuit system. The first object is achieved by providing the means.
According to a second aspect of the present invention, in the first aspect of the present invention, the plurality of switch units are further provided with switching units which can be arbitrarily separated / connected so as to satisfy the standards and noise immunity levels of the installation country. Thereby, the third and fourth objects are achieved.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a schematic center sectional view of a multicolor image forming apparatus employing an actuator control system according to the present embodiment. The belt-shaped photosensitive member 1 is rotatably supported by rotating rollers 2 and 3 and rotates in the direction of arrow A. A charging device 4, a discharging lamp L, and a cleaning blade 15a for the photoconductor are arranged on the outer peripheral portion of the photoconductor 1.
[0008]
At a downstream position of the charging device 4, there is provided an optical writing unit to which a laser beam 5 </ b> D emitted from the laser writing unit 5 is applied. At a position downstream of the optical writing unit, a multicolor developing device 6 in which a plurality of developing units are supported so as to be switchable is arranged. The multicolor developing device 6 includes a yellow developing unit, a magenta developing unit, and a cyan developing unit for each color of the toner to be stored. Above the multicolor developing device 6, a black developing unit 7 containing black toner is provided. One of the developing units moves to a developable position in synchronization with the developing timing of the corresponding color.
[0009]
The multicolor developing device 6 has a mechanism for selecting the developing unit by a rotation of 120 degrees on the circumference. Then, when these developing units operate, the black developing unit 7 moves to a position separated from the photoconductor 1. The movement is controlled by the rotation of the cam 45.
In the laser writing unit 5, light from a laser light source (not shown) is scanned by a polygon mirror 5B that is driven to rotate by a motor 5A, passes through an fθ lens 5C, a mirror 5F, and the like, reaches the photosensitive body 1, and is charged. A latent image corresponding to the written information is formed on the body 1.
The latent image on the photoreceptor 1 is developed by the above-described developing device, and a visible image by toner is formed and held on the surface of the photoreceptor. The upper portion of the photoconductor 1 is in contact with the intermediate transfer belt 10.
[0010]
The intermediate transfer belt 10 is rotatably supported by rotating rollers 11 and 12. The toner image on the photoreceptor 1 is transferred to the surface of the intermediate transfer belt by a bias unit 13 on the back side of the intermediate transfer belt 10. The photoconductor 1 is cleaned for each color, a toner image of a predetermined color is sequentially formed on the photoconductor, and is transferred to the same position on the intermediate transfer belt 10 for each rotation of the intermediate transfer belt 10 each time. A color toner image in which several colors are superimposed on the intermediate transfer belt 10 is formed.
[0011]
The color toner image in which several colors are superimposed on the intermediate transfer belt 10 is transferred to a recording medium such as paper or plastic.
At the time of transfer to paper, the paper housed in a paper feeding device (paper feeding cassette) 17 passes through a paper feeding roller 18, a pair of conveying rollers 19, and a pair of registration rollers 20, and enters a nip between the intermediate transfer belt 10 and the transfer roller 14. The paper and the image are conveyed in a timely manner so that the positions of the paper and the image become normal.
By the action of the transfer roller 14, the toner images of several colors on the intermediate transfer belt 10 are collectively delivered and the paper is sent to the fixing device 50, where the toner image on the paper is fixed, and the paper is discharged by the discharge roller pair 51. The paper is discharged to the paper discharge stack 52 at the top of the main body frame 9.
[0012]
The intermediate transfer belt 10 is provided with a cleaning device 16 for the intermediate transfer belt at the position of the roller 11, and the cleaning blade 16A is configured to be able to freely contact and separate via a cleaning blade contacting / separating arm. In the step of receiving the toner image from the photoreceptor 1, the cleaning blade 16A separates from the intermediate transfer belt and comes into contact with the intermediate transfer belt after transferring the image to the paper. Remove residual toner.
As described above, there are a cleaning blade 16A for the photoreceptor 1 and a cleaning blade 16A. The waste toner scraped by these blades is stored in a collection container 15 and the container is replaced as appropriate. An auger 16B provided inside the cleaning device 16 for the intermediate transfer belt 10 transports the waste toner scraped off by the blade, and sends it to the collection container 15 by transporting means (not shown).
[0013]
In the drawing, reference numeral 31 denotes a unitized process cartridge, which integrally incorporates the photosensitive member 1, the charging device 4, the intermediate transfer belt 10, the cleaning device 16, a conveyance guide for forming a paper conveyance path, etc., so that it can be replaced at the end of its life. It is configured.
In addition to the replacement of the process cartridge 31, the multi-color developing device 6, the black developing device 7, and the like are also replaced at the end of their service life. Numeral 8 has a structure that can rotate and open around a support shaft 9A.
On the left side of the figure, the electrical equipment / control device E is housed. Above it, a fan F is provided to exhaust air to prevent the temperature inside the machine from rising excessively. On the right side of the figure, another relatively small paper feeder MF is provided.
[0014]
FIG. 2 is a system block diagram of a multicolor image forming apparatus including the actuator control system according to the present embodiment.
In FIG. 2, reference numeral 101 denotes a CPU (central processing unit) that controls the system of the multicolor image forming apparatus. The CPU 101 executes a random access memory (RAM) according to a program stored in a ROM (read only memory) 102. The multi-color image forming apparatus is controlled while using an access memory (103) as a work area.
[0015]
Reference numeral 104 denotes various actuators for performing mechanical operations such as paper feeding and discharging, and these are driven by a driver circuit 106. Also, the I / O control unit 107 converts the input of various sensors 105 for detecting paper size, jam detection, and mark detection serving as a reference for superimposing colors, and the output control signal of the driver circuit 106 based on a command from the CPU 101. Control. 108, a printer controller for translating image output information and the like from a personal computer or the like; 109, an I / F circuit as an interface between the printer controller 108 and the CPU 101; 110, a writing unit; 112, an operation for an operator to perform various settings; A reference numeral 111 denotes an I / F circuit which is an interface between the operation panel 112 and the CPU 101, and a reference numeral 113 denotes a power supply unit. The portion surrounded by the dotted line is the engine circuit.
[0016]
FIG. 3 is a block diagram of a power supply / ground system of an engine circuit of a general multicolor image forming apparatus.
+ 5V-COM1 and + 24V-COM3 are supplied from the power supply unit 113 to the engine board, and + 24V-COM3 is a power supply-ground supplied to various actuators such as motors, clutches, solenoids and their driver circuits. I have. Further, + 5V-COM1 is a power supply-ground supplied to various sensors and actuators 104, and + 5V-COM1 is passed through a common mode filter as + 5VV-COM2 to supply power to logic systems such as the CPU 101, the ROM 102, the RAM 103, and the writing unit 110. It is supplied as ground.
[0017]
FIG. 4 is a power / ground system diagram of the engine circuit of the multicolor image forming apparatus according to the present embodiment. In FIG. 4, RY1 is a relay for performing connection / separation switching between + 5V / COM2 and + 5V / COM separated by + 5V / COM1 and a common mode filter, and RY2 is a connection / separation switching between COM3 and FG. RY3 is a relay for performing connection / separation switching between COM1 and FG, and RY4 is a relay for performing connection / separation switching between COM2 and FG.
[0018]
In the first embodiment, by arbitrarily switching these, a more flexible system configuration is provided as a measure for suppressing noise, particularly radiation of a radiation electromagnetic field. In particular, if it is desired to reduce the cost, a short circuit / open circuit may be provided by a jumper or the like without using a relay.
In the second embodiment, when noise, in particular, the radiation level of a radiated electromagnetic field differs according to the operation mode, RYI to RY4 are arbitrarily switched to provide a system configuration that produces less noise.
In the third embodiment, the switching of RYI to RY4 can be further changed according to the standard of the installation country.
[0019]
FIG. 5 and FIG. 6 are flowcharts showing the procedure of the process according to the present embodiment. In FIG. 5, first, a country code setting mode is entered (step 10; Y, step 11), the installation country is Japan (step 12; Y, step 13), North America (step 14; Y, step 15), Europe / Asia By selecting (Step 16; Y, Step 17), RY1 to RY4 are switched so as to satisfy the corresponding standard of the country where the system is installed and to have the best noise resistance level in the operation mode state.
[0020]
If there is a standard / condition specific to the country (Step 10; N), the mode is set to an arbitrary setting mode (Step 18), and an arbitrary setting can be made in each mode (Step 19). ~ Step 21). If the user does not want to use the switching function based on the country code, the setting can be disabled and set arbitrarily in the setting mode (step 18).
If it is not desired to use the switching function depending on the operation mode (Step 22; N), the setting is invalidated and the Stand-by mode state is maintained (Step 24). On the other hand, when the switching function according to the operation mode is enabled (Step 22; Y), RY1 to RY4 are switched according to the setting of each operation mode (Step 23).
[0021]
【The invention's effect】
According to the first aspect of the present invention, since a plurality of relays are arbitrarily separated / connected, it is possible to arbitrarily set the presence or absence of the insertion of the noise removal common mode filter, and to achieve a flexible and stable operation according to the environment. An image forming apparatus that does not cause radio interference can be provided.
According to the second aspect of the present invention, the switching means which can be arbitrarily separated / connected so as to satisfy the compliant standard of the installation country and the anti-noise level is provided, so that the radio interference is not generated according to the compliant standard of the installation country. An image forming apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic center sectional view of a multicolor image forming apparatus employing an actuator control system according to an embodiment of the present invention.
FIG. 2 is a system block diagram of a multicolor image forming apparatus including an actuator control system according to an embodiment of the present invention.
FIG. 3 is a block diagram of a power supply / ground system of an engine circuit of the multicolor image forming apparatus.
FIG. 4 is a power supply / ground system diagram of an engine circuit of the multicolor image forming apparatus according to the present embodiment.
FIG. 5 is a flowchart illustrating a procedure of a process according to the embodiment;
FIG. 6 is a flowchart showing a procedure of a process according to the embodiment, and is a continuation of FIG. 5;
[Explanation of symbols]
1 Photoconductor 2, 3 rollers (support shaft of photoconductor)
4 Charging device 5 Laser writing unit 6 Multicolor developing device (color developing device)
7 Black developing unit 10 Intermediate transfer belt 14 Transfer roller 17 Paper feeder (paper feed cassette)
18 feed roller 19 transport roller pair 20 registration roller pair 50 fixing device L static elimination lamp

Claims (2)

In an image forming apparatus in which circuits of different systems are controlled by one power supply unit and a control board,
An image forming apparatus comprising a plurality of switch means for separating / connecting a power supply and a ground via a filter for each circuit system. 2. The image forming apparatus according to claim 1, further comprising a switching unit that can arbitrarily separate / connect the plurality of switch units so as to satisfy a standard and a noise resistance level corresponding to an installation country.

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