JPS61129656A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the insulation of electrical parts by the effect of a toner by hinging upper and lower machine body covers each formed of a resin having an insulating characteristic and disposing concentrically the electric parts in the recess provided on the outside at the base of the lower machine body. CONSTITUTION:The lower machine body 1 and the upper machine body 2 are molded of the resin body having the insulating characteristic and are made freely openable and closable by means of a hinge mechanism 3. The recess 21 is formed on the outside at the base of the body 1 and a frame body 31 is attached thereto. An electrical part unit 30 is housed into the body 31. A high-voltage transformer 35 which transforms the voltage of a commercial power source, a high-voltage unit 36 which supplies high- voltage current by rectifying and controlling the high voltage and a printed circuit board 37 for circuits to control the operation and temp. of various parts are freely attachably and detachably attached to the unit as the electrical parts. The unit 30 is connected by means of a lead wire 44 to a terminal board 40 and is connected to the respective function parts, not shown, of the bodies 1, 2. The deterioration of the insulation of the electrical parts by the effect of the toner suspended in the machine body is thus prevented and the maintenance of the high-voltage parts is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to image forming apparatuses such as copying machines, facsimile machines, and printers, and particularly to an image forming apparatus in which electrical components are arranged in a concentrated manner.

``Prior Art'' For example, in a copying machine, a high-voltage unit that supplies high voltage to a charging and transfer device, a control board that controls the operation and temperature of each part, and other electrical components are usually installed independently in desired spaces within the copying machine. Because these electrical components are scattered throughout the area, a large number of wire harnesses are required to connect these electrical components and various components, which not only complicates manufacturing and maintenance, but also
This can easily lead to wire breakage and other accidents.

In addition, particularly in copying machines that use conductive powder toner as a developer, toner floating inside the copying machine adheres to the conductive exposed parts of the electrical components, easily causing short circuits, malfunctions, and other accidents. .

In order to eliminate this drawback, a technique has been proposed in which the electrical components are housed in a unitized control box and the control box is placed at a predetermined position within the copying machine (Japanese Patent Laid-Open No. 58-1).
No. 0752) "Problems to be Solved by the Invention" However, even in such prior art, since electrical components are arranged in a control box device that is unitized and has a predetermined size, the device inevitably becomes larger and Even if electrical components are housed in a control box, it is not possible to seal all the electrically conductive parts that connect the electrical components to various components or power supplies, and short circuits and other accidents may occur due to the conductive toner adhesion. Occurrence cannot be completely prevented.

The technical problem to be solved by the present invention is to achieve ease of manufacturing and maintenance by arranging electrical components in a concentrated manner, while reducing the size of the device and completely preventing short circuits, malfunctions, and other accidents caused by adhesion of conductive toner. An object of the present invention is to provide an image forming apparatus that can prevent such problems.

In order to achieve the above technical problem, the present invention forms the fuselage cover with an insulating resin material, and in a predetermined space formed by the outer wall surface of the fuselage cover, We propose an image forming apparatus in which electrical components such as a control board and a high voltage unit are arranged in a centralized manner.

It should be noted that the electrical components need not necessarily be arranged in a concentrated manner, but only electrical components that are likely to cause short circuits, poor conductivity, and other accidents due to adhesion of toner may be arranged in a concentrated manner.

"Operation" According to this technical means, since the electrical components are arranged in a predetermined space completely separated by the body cover; it completely blocks the intrusion of conductive toner and other substances, and prevents short circuits due to the adhesion of the toner. , there is no risk of poor conductivity or other accidents.

Further, the space can be formed by recessing the fuselage cover inward on the side of the free space existing in the device, and since the space can be used effectively, it is possible to avoid increasing the size of the device. I can do it.

Furthermore, since the space is surrounded by a fuselage cover made of an insulator, leaving an outer opening, it can be easily sealed by covering only the outer opening with an insulating plate or other material. , electrical safety is guaranteed.

By forming the space on the bottom side of the fuselage cover, the safety of the calendar can be ensured by eliminating the risk of dust entering from outside the fuselage or a third party accidentally touching the electrical components.

Furthermore, by housing and arranging the electrical components in a predetermined frame to form a unit, and detachably attaching the unit body to the outer wall surface of the fuselage cover, the electrical components can be easily installed, repaired and replaced, and labor-saving maintenance is achieved. becomes possible.

"Embodiments" Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of the components described in this example are not intended to limit the scope of this invention, but are merely illustrative examples. It's nothing more than that.

Figure 1 shows the configuration of a copying machine that can be divided into two parts with the transfer paper conveyance path as the boundary. 1 is the lower body cover, 2 is the upper body cover, and both are provided on the rear edge. Hinge member 3
It is configured so that it can be opened in the front through the .

The E-side body cover 2 is made of an insulating resin material, and has a reciprocating document table 4 disposed on its upper surface, and also has a photosensitive drum 5, a charging device 6, and a connector at predetermined positions inside the body cover 2. Image optical system 7. Developing device 8, cleaning device 3. and a drive motor IO are provided.

The lower fuselage cover 1 is also formed of an insulating resin body,
A receiver is formed on the upper surface of the fuselage cover 1 for mounting various members to be described later at predetermined positions.

To explain its shape in detail, there is an opening 12 on the side wall on the paper feed side into which the copy paper storage capacity cell (11) is removably inserted, and an opening 1 on the side wall on the paper output side to attach the paper output tray 13.
A copy paper storage cassette 11 and a transfer device 1 are formed on the upper surface of the bottom wall sandwiched between both openings 12 and 14, respectively.
5, and between the guide surface 17, the recess 18 for attaching the transfer device 15, and the recess 18 for attaching the fixing unit 16, in which the fixing unit 16, in which the fixing roller lea and the paper ejection roller 161) are integrally assembled, is placed at a predetermined position. are formed in order along the copy paper conveyance direction.

The bottom wall surface between the two recesses 18 and 19 is rectangular and has six inner walls, the top surface of which serves as a copy paper conveyance path 20, and the bottom surface thereof having a space 21 into which an electrical component unit 30 (to be described later) can be mounted. form. Note that the registration rollers and other paper feeding units 22 are configured to be able to be installed in notches formed in the front and rear walls of the body cover 1 (not shown).

The space 21 is formed in a substantially rectangular shape parallel to the axis of the photosensitive drum 5, surrounded on three sides by partition walls formed by the body cover 1, and is open only on the lower side.

FIG. 2 shows the configuration of the electrical component unit 30 installed in the space 21. As shown in FIG.

Reference numeral 31 denotes a frame made of insulating resin, which is a rectangular box with an open upper surface and a peripheral surface 32 formed along the upper edge. The frame body 31 is connected to the predetermined space 2 through a screw (not shown).
1 upper surface (bottom surface of fuselage cover 1).

Inside the frame 31 is a high voltage transformer 3 that boosts the commercial power source.
5. A high-voltage unit 38 that arranges and controls the alternating current generated in the high-voltage transformer 35 and supplies high-voltage current to the charging device 8, etc., and a control board 37 equipped with various circuit components that control the operation and temperature of each part. are detachably attached, and are connected to a power supply needle 38 and a connector cord 38, respectively, which are drawn out from the side wall surface of the frame 31.

3A to 3C show a state in which the electrical component unit 30 is attached, and the electrical component 35.3B,
In order to facilitate the electrical connection between 37 and various parts within the device,
A wiring board 4o is erected near the internal hinge member 3 and is arranged parallel to the wall surface of the lower body cover lvk.

The wiring board 40 has a full width that can almost cover the maximum width of the input terminal mounting positions of various parts arranged in the device, and has electric wires 43 at positions corresponding to the input terminals 41 of the various parts. is pulled out and connected to the input terminal 41, an input cord 44 is attached near the bottom side, and the input cord 44 is pulled out to the space 21 side through a small hole 45 bored in the rear partition wall of the space 21, It is connected to the connector 4B of the unit 30.

To exemplify the connections between the wiring board 40 and various parts, the lower body cover 1 includes a heater 16C1 installed in the fixing unit 16, an axial flow fan 47, etc., and the upper body cover 2 includes a has a light source 7a of an imaging optical system 7, a cooling fan 48, a drive motor 10, etc., all of which are disposed with input terminals 41 facing the wiring board 40 side, and are drawn out from the wiring board 40. Connect the electric wire 43 to the input terminal 41
It is connected to.

By installing the wiring board 40 in this way, the electric wires 43 can be placed at a minimum distance without being routed inside the device, and accidents such as broken lines, erroneous contacts, etc. can be prevented.

As is clear from the above description, according to the present embodiment, in addition to being able to smoothly achieve the above-mentioned functions, since the upper surface of the electrical component unit 30, which is configured to be detachable, is open, the electrical components 35, 36, 37 installation, replacement, and repair become easier.

"Effects" As described above, according to the present invention, since the electrical components are centrally arranged in a predetermined space separated from the inside of the device by the insulating body cover, toner floating inside the device is removed from the electrical components. There is no risk of toner adhering to conductive parts, and short circuits, malfunctions, and other accidents caused by toner adhesion can be completely prevented.

Further, since the predetermined space can be formed at any free space on the outer wall surface of the body cover, it does not hinder miniaturization of the device.

Furthermore, by centrally arranging electrical components, manufacturing and maintenance can be facilitated.

It has various effects such as

[Brief explanation of the drawing]

1 to 3C all show embodiments of the present invention,
FIG. 1 is a front sectional view showing the configuration of a split-body type copying machine;
Figure 2 is a perspective view showing the configuration of the electrical component unit;
Figure A is a sectional view taken along the line A-A' in Figure 1, 3B and 3C, showing the state in which the electrical component unit is installed.
The figure is a schematic plan cross-sectional view illustrating the connection state of various parts in the device of the lower body cover and the upper body cover, respectively.

Claims (1)

[Claims] 1) An image forming apparatus characterized in that the body cover is formed of an insulating resin body, and electrical components are arranged centrally in a predetermined space formed on the bottom side of the body cover.2) The electrical components are arranged in a predetermined space. The image forming apparatus according to claim 1, wherein the image forming apparatus is housed and distributed in a frame to form a unit, and the unit body is detachably attached to the bottom surface of the body cover.