JP3212728B2 - Image forming device - Google Patents

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 based on an electrophotographic process applied to a printer, a facsimile, a copying machine, etc., and more particularly to an image in which an effective layout between a process means, a substrate and a frame is pursued. An object is to provide a forming apparatus.

[0002]

2. Description of the Related Art In an electrophotographic image forming apparatus which has been frequently used in recent years, various process means such as exposure, development, and transfer are arranged around a photosensitive drum and a recording paper conveying direction in contact with a transfer position is arranged. , A paper feed roller for feeding recording paper from a cassette, a registration roller for sending recording paper to a transfer position in synchronization with the start of the toner image carried on the photosensitive drum, and a transfer roller for transferring an unfixed toner image onto the recording paper It is necessary to dispose a fixing roller or the like for heating and fixing the unfixed toner image, and since most of them are constituted by rotating members, a driving motor for transmitting a driving force to these rotating members is required. And a gear train and other transmission systems.

On the other hand, it is necessary to apply a developing and transfer bias to the developing sleeve and the transfer roller at a predetermined time.
Further, it is necessary to control the rotation of the paper feed roller and the registration roller according to the paper feeding state.Furthermore, when a jam occurs in the conveyance path, it is necessary to cut off the power supply and display the fact on the display side, Therefore, the above-described apparatus requires an engine board incorporating a control IC for performing various controls of these process systems.

In the conventional apparatus, a pair of frames are erected at both ends in the axial direction of the photosensitive drum in parallel to support the rotating member and other processing means, and the frame is directly or indirectly provided between the frames. In addition to mounting or supporting the process means, the arrangement positions of the conduction system and the substrate are allocated so that the harness on the substrate side is not damaged by erroneous contact with the conduction system, and the conduction system is configured on one frame side. A gear train, a drive motor, and the like are provided. On the other hand, an engine board is provided on a frame side opposite to the frame, or a board storage area is provided at the bottom of the apparatus, and an engine board and other various boards are provided in the storage area. It was common to do.

[0005]

However, as described above, it is inevitable to dispose the drive motor and the clutch constituting the transmission system at a position separated from the engine board without electrically connecting the two with a harness. However, as a result, the harness is routed inside the device. This problem is particularly serious in an image forming apparatus in which a part of the transfer paper transport path can be divided and opened with respect to the apparatus main body in order to facilitate the transfer paper jam processing. Since the electrical components are arranged on both sides of the device main body, the electric wires and the electric wire side for electrically connecting the electric components are arranged with a sufficient length so as not to be dashed even when the open body is divided. I have.

However, if the electric wires are arranged with such an extra length, the electric wires are routed to find an extra space that does not obstruct the transfer space. Broken line accidents are more likely to occur. In order to solve such a drawback, the present applicant disposes a board near the hinge part which is divided and opened first, and shortens the harness as much as possible even when the board is connected to an electric component on the upper body side. The disclosed technology is disclosed. However, the above-mentioned apparatus is limited to an apparatus that splits and opens the upper body and the lower body, and arranging the substrate at the innermost part of the hinge, which is the most difficult to disassemble and repair, poses a serious problem in manufacturing.

In view of the above-mentioned drawbacks of the prior art, the present invention allows not only a drive motor and a paper feed clutch but also an electrical connection between a process means and a substrate or between other substrates to be performed substantially without a harness. The present invention provides an image forming apparatus which reduces disconnection accidents, facilitates assembly and maintenance and inspection, and does not lose ease of assembly repair and maintenance and inspection even when the harness itself is eliminated. For the purpose.

[0008]

Conventional devices Means for Solving the Problems] Although to arrange the integrally drive motor and said transmission electrical system frame disposed conduction system is generally present invention is particularly, recording paper conveying On the street
At least a plurality of professionals including photoreceptor drums
A transmission system for transmitting the rotational force to the
One printed circuit board adjacent to the other side of the frame
In the image forming apparatus arranged in parallel, the conductive system is
It is arranged to face the process means and the print
Driving directly on the side of the board opposite to the other side of the frame
A dynamic motor is attached, and the rotation axis of the drive motor is
Through the printed circuit board and the frame and in front of the frame.
The driving force is transmitted to the conduction system by extending to the one surface side.
And a conductive system exists between the frame and the printed circuit board.
It is characterized in that it is configured not to .

[0009]

According to this technical means, the fact that the drive motor is mounted not on the frame side but on the board side can be directly controlled based on the IC on the engine or other printed board without using a harness or the like. In addition, since the conduction system also faces the board and the frame via a predetermined gap, for example, a clutch or other electrical component forming a part of the conduction system should be protruded toward the printed circuit board side and abut as necessary. Thereby, the control of the clutch can be performed without the harness from the printed circuit board side. Further, the motor is directly mounted on the printed circuit board, and the motor shaft extends through the printed circuit board and the frame. As a result, the motor is supported at two points of the board and the frame, and the strength is also guaranteed. .
Also, the fact that the frame and the printed board face each other allows signals to be directly received and received with the board side using a connector etc. without using a harness even if a jam or other sensor is attached to the frame side. The distance can be extremely short.

In this case, when the drive system and the printed board face each other directly, metal particles, dust and the like generated by the meshing rotation of the drive system may be undesirably attached to the wiring of the printed board. There in the frame in the present invention
The conduction system provided on one surface is arranged to face the process means so that the conduction system does not exist between the frame and one printed circuit board located on the back side thereof . This not only eliminates the drawbacks, but also allows a jam sensor or the like to be arranged on the side of the printed circuit board facing the frame,
Since an actuator for detecting the sensor can be supported by the frame, a special support is not required, which is preferable.

The presence of a frame between the printed circuit board and the process means does not necessarily support the actuators of the detection sensor at both ends, but only supports the adjacent frames in a cantilever manner. Parts and weight reduction are achieved.

The other side of the frame of the printed circuit board
The main board for image processing is provided on the side of
On both sides of the board, perpendicular to the direction of the printed circuit board
The control panel board and the power board are arranged
But not through the harness, but through the connector
It is also an effective means of the present invention to be configured to be directly attachable.
It is. Thus, the frame of the printed circuit board
The other main board for image processing on the side, and the pre of
It is preferable to arrange the control panel substrate and the power supply substrate on both side ends of the printed circuit board at right angles to the direction in which the substrate is arranged. That is,
Main board for image processing is IC for font change etc.
It is necessary to attach and detach cards and optional boards as appropriate,
In such a case, it is preferable to arrange a main board for image processing on the side facing the side wall of the apparatus.

When the printed circuit board for the engine is connected with an extremely short harness without using or using a harness, a signal is directly received from the shaft end side of the process means connected to each electrical processing means. It is necessary to configure the structure, and for that purpose, the shape thereof is determined so as to substantially overlap the arrangement position of the process means. in this case,
It is also possible to arrange the control panel board and the power supply board in a substantially U-shape so as to sandwich the engine printed board. In this case, a connector is provided at a side end of the engine board, and the board is connected via a harness. It is also easy to directly attach the connector via a connector without any trouble, which makes it extremely easy to assemble, disassemble and repair.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. Not just. FIG.
1 is a schematic diagram illustrating a configuration of a printer in which an exposure unit according to an embodiment of the present invention is inserted into a photosensitive drum. The housing 1 used in the present apparatus has a paper discharge unit 2 that is inclined upward and forward (rightward in the figure) from the back to the upper surface side, and a fulcrum 3a provided with a front wall 3 at the lower end. It is configured so that it can be raised and lowered as the center, and is locked by the locking portion 4 at the time when it is laid down substantially horizontally with a slight upward inclination angle so that the position can be regulated. A recording paper placement unit 5 is provided on the bottom surface of the apparatus, which is located on an extension of the top surface of the fallen front wall 3, and is placed on the placement unit 5 with an elastic force urged upward with a shaft as a fulcrum. Board 5
a is arranged.

A paper feed roller 11 is pivotally supported at the distal end of the placement section 5, and a substantially arcuate recording paper transport path 10 is formed from the paper feed roller 11 toward the upper surface paper discharge section 2. The paper detection sensor 12 (more specifically, the actuator) and the transfer roller 1 are sequentially arranged along the recording paper conveyance direction of the conveyance path 10.
3, a photosensitive drum 14, a fixing roller unit 15, and a discharge roller pair 16, and a developing unit 6 is provided in a space above the mounting portion 5 opposite to the transfer roller 13 with the photosensitive drum 14 interposed therebetween. Deploy. A paper trailing edge detection sensor 19 composed of an encoder is disposed adjacent to the paper feed roller 11 on the upper surface side of the mounting portion 5.

Next, the respective members will be described in detail. As shown in FIG. 3, the paper trailing edge detection sensor 19 composed of the encoder 19a can detect the trailing edge of the business card size at a position within 85 mm from the paper feed roller and can detect all the recording papers 18 on one side based on the end face. The rotation amount of the encoder is detected at the light receiving unit side, and when the rotation is completed, the passage of the recording paper 18 is determined by the controller C / U including the control IC based on the signal when the rotation is completed. And
When there is no paper on the loading section 5 and when the recording paper 18 is shorter than the transport distance from the paper feed roller 11 to the fixing roller pair 15, the stop timing of the paper feed roller is set. A substantially vertical wall 21 for aligning the recording paper is protrudingly provided on the leading end side of the placing section 5, and a friction pad 22 is provided on the upper surface of the starting end of the transport surface in contact with the vertical wall 21. The paper feed roller 11 is disposed so as to be in contact with both of the paper placement units 5. As shown in FIG. 3, the paper feed roller 11 is also arranged such that all recording papers can be fed on the basis of the end face, and are shifted to one side within the business card width.

A concave space 23 is formed on the recording paper conveying surface adjacent to the friction pad 22, and the paper detection sensor 12 is disposed with the front end protruding from the concave space 23.
In order to ensure that the recording paper is captured by the sensor 12 at a predetermined position, a paper feed guide 24 is disposed so as to be able to face the conveyance surface via a slit gap. Then, the transfer roller 13 and the photosensitive drum 14 are arranged facing each other on the recording paper transport path 10 extending obliquely upward from the position of the sensor 12.

The transfer roller 13 uses a conductive roller to increase the transfer efficiency, applies a transfer bias having a polarity opposite to the charge potential of the toner, and uniformly presses the peripheral surface of the photoreceptor drum 14. 14 so as to be rotatable. The photoconductor drum 14 is formed by laminating a light-transmitting conductive layer, an injection blocking layer, a photoconductor layer, and a surface layer on a light-transmitting support from the inner surface side in a known manner, and has a diameter of 30 mm. , And has a length of 300 mm in the axial direction, so that the A-3 size can be inserted.
The LED unit 7 is inserted into the drum 14, and only the photosensitive drum 14 is configured to be able to rotate clockwise in a state where the LED unit 7 is fixedly arranged.

The LED unit 7 is composed of a converging lens array (trade name: Selfoc lens) disposed on a printed circuit board on which LED chip rows and the like arranged in a row along the drum axis direction are mounted. These are integrally held by a head block and are configured to be capable of forming an image on the photoconductive layer of the photosensitive drum 14 while outputting data of one scan line of pixel information while driving the LED chip in a time-division manner. I have. The developing unit 6 includes a toner container 31, a container body 32 containing a carrier and toner,
A developing sleeve 30 containing a fixed magnet assembly 33 is provided on the side of the container body 32 facing the photoconductor drum 14, and the diameter of the sleeve 30 is set to 30 mm in the same manner as the photoconductor drum 14. It rotates in the counterclockwise direction in the same direction as the photosensitive drum 14, and is preferably configured to be capable of forward feed at a rotation speed of about 5 to 10 of the peripheral speed of the photosensitive drum 14.

A partition is provided between the toner container 31 and the container body 32.
A supply roller 35 is disposed in a slit opening provided in the wall, and the supply roller 35 rotates every time the carrier / toner mixture ratio (toner density) in the container main body 32 is reduced based on a signal from the sensor 36, and is constantly rotated. It is configured to maintain the proper blending ratio. A mixer 37 is provided in the container main body 32 to maintain the carrier / toner mixture ratio in the container main body 32 at a uniform concentration. The fixed magnet assembly 33 is set in a magnetic pole arrangement as shown in FIG. 1, and the main magnetic pole N for forming the rubbing area is particularly located upstream from the closest position between the drum 14 and the sleeve 30 in the rotation direction of the drum 14. It is arranged at a position displaced by about 2 °. The fixing unit 15 is disposed at a position facing the upper surface of the apparatus above the photosensitive drum 14, and is configured so as to surround a fixing roller pair including a heat roller 15a and a press roller 15b with a heat insulating material. The paper discharge roller pair 16 is provided at the exit end of the recording paper conveyance path 10 in which the upper surface of the apparatus is raised in an arc shape.

In the present embodiment, the registration function is provided by the paper feed roller 11 and the paper feed sensor 12 because the registration roller is eliminated. Next, the layout of the drive system in FIG. 2 will be described. First, by driving the main motor M, the photosensitive drum rotates clockwise through relay gears G1, G2, G3, G4, G5 (hereinafter referred to as a main gear train) and a drum shaft gear G6. The relay gear G3 is connected to the relay gears G11 and G
12, a group of shaft gears G13, G1 in the developing container body 32
4, the developing sleeve 30 is rotated together with the mixer 37, and the photosensitive drum 14 is mixed together with the mixing.
Are rotated at a relative speed to form a developer rubbing area.

The relay gear G4 is meshed with the shaft gear G23 of the transfer roller 13 via the relay gears G21 and G22. Further, the relay gear G5 is meshed with the shaft gear G31 of the paper feed clutch, and passes through the paper feed clutch
Are rotatable. On the other hand, the relay gear G21 on the transfer roller 13 side is connected to the relay gear G2 via the external gear G21a.
4, fixing roller 15b via shaft gear G26
The (heat roller) shaft gear G27 and the discharge roller are further configured to be rotatable via the shaft gear G27 of the fixing roller 15b and the discharge gear shaft gear G28.

[0023] The device opens portion extending on the placing part of the upper surface of the apparatus side through the discharge path from the transfer position about the supporting shaft 17 of the lower end of the drawing the left side wall in the drawing the left side, the recording sheet While the conveyance path is opened, the pressure between the fixing roller pair is released following the opening, but the relay roller G22 and the shaft gear G23 that transmit the driving force to the transfer roller are split open. It is pivotally supported on the open frame 1B side and functions as a swing gear. As a result, the transfer roller 1 is completely
3 will be blocked. The portion shown by the thick line in FIG. 2 is a frame which is divided and opened, and the side wall shown by the diagonal lines in FIG. 1 and the gears G22, G23, G27, G28 in FIG. The paper roller will be located on the open frame side. Next, a configuration for connecting each of the process means to the substrate will be described with reference to FIGS.

FIG. 5 is a perspective view showing a layout of a frame and various print control boards. These shafts are supported on the side wall of the apparatus facing the shaft ends of the photosensitive drum 14, the fixing roller pair, the developing sleeve 30, and the like. Further, a frame 51 on which the gear train (omitted) is provided is arranged upright. An engine board 52 is erected in parallel with a gap therebetween on the outside thereof, and the rear surface of the engine board 52 in the drawing (the frame 51 side)
The paper detection sensor main body 12B for detecting paper by the swing of an actuator 12A disposed on the transport path 10 via a frame 51, a paper supply clutch 41, and a power supply board 5
The five connectors 52a are provided at predetermined positions. On the other hand, a main motor M is fixed on the surface of the board 52, and connectors 52b and 52c for connecting the main board 53 and the front panel 54 are provided. The paper feed clutch 41 is fitted to the frame 51 together with the engine board 52 so as to be able to be firmly held together with the engine board 52, as understood from FIG. On / off control is performed based on the instruction as described later. Further, the engine board 5
A main substrate 53 is arranged outside the unit 2 in parallel with a gap, and is configured to be electrically connectable and fixable to the engine substrate 52 via the connectors 12b / 53a. Various IC chips for controlling the driving of the process means and various IC chips for controlling the driving of the process means are mounted thereon, and further, an IC card 58 and an optional board 59 can be mounted via the connection connectors 53b to 53c.

A front panel 54 for various operations is disposed on the right side of the engine board 52 in the figure at right angles to the board 52 and parallel to the front wall of the apparatus, and is configured to be electrically connectable by connectors 52a / 54a. ing. Various operation switches 552 are arranged on the front panel 55 together with the display liquid crystal plate 55. On the left side of the engine board 52 in the drawing, a power board 56 is erected perpendicularly to the board 52 so as to be able to face the front panel 54 with the process means interposed therebetween, and is electrically connected by the connectors 52a / 54a. It is configured to be connectable. Reference numeral 56 denotes a heat sink for heat dissipation of the power unit and the like. A jam sensor 57 is disposed between the transfer roller 13 and the fixing roller, and detects a jam by swinging an actuator similarly to the paper feed sensor.

FIG. 6 is a top view showing the arrangement of the substrates. A pair of frames 51, 50 are erected on both sides of the apparatus between both ends of the processing means. A photosensitive drum 14 unit, a transfer roller (not shown below the drum 14), a fixing unit 1 via a drum receiver 141.
The developing unit 6 is engaged and fixed on a mounting plate (not shown) provided between the frames 51. The main motor M mounted on the engine board 52 is a bearing M having a motor shaft M2 provided on the frame 51.
3, through a gear train supported on the rear surface of the frame 51, meshed with a relay gear G1 of the main gear train via a shaft gear M1, and the main motor M is connected to a power supply board 54 from a connector 52a / 54a. The power is supplied from a power unit (not shown) via the power supply, and the above-described predetermined drive control is performed. Further, the fixing roller 15 a inserted in the fixing unit 15 is also provided with a control IC disposed on the main substrate 53.
Heating and supply are performed while receiving power supply from the power supply board 54 side based on a signal from the C / U. The LED unit 7 inserted in the photoreceptor drum 14 uses image information obtained from the host side based on an image signal sent from an image control IC on the main board 53 to drive ICs in the LED unit 7. To control the lighting of the LED chips. The photoreceptor drum 14 is rotatably supported by a drum receiver 141 fixed between the frames 51 and 50, and a shaft gear G6 ring-mounted and fixed to the shaft end side of the drum 14.
The drive is controlled via the.

FIG. 7 shows the arrangement of the paper feed roller 11 and the like located below the developing unit 6. The paper feed clutch 41 fitted to the main board 53 and the frame 51 as described above has a relay gear A shaft gear G31 meshing with G5 is formed, and is connected to the paper feed roller 11 via a shaft 11a. The paper trailing edge detection sensor 19 includes the encoder 19a and the sending / receiving element 19b. The encoder 19a rotates following the movement of the recording paper, and a pulse signal generated by the rotation is received on the control IC side. The control described below is performed. Reference numeral 12B denotes the above-described paper feed sensor, 12A denotes an actuator, and the actuator supports an actuator shaft 12C on a bearing 12d of the frame 51.
The replenishing roller 3 on the toner container 31 side of the developing unit
5 and the like rotate each time the toner concentration decreases, and therefore have a dedicated motor and drive system (not shown).
These can be attached to the developing unit or
It may be attached to.

Next, the operation for printing a recording sheet will be described with reference to a time chart shown in FIG. 4, a drive system shown in FIG. 2, and a control block diagram shown in FIG. First, the main motor M is driven by turning on the switch, and the developing bias V
Rise through a time constant. When the main motor M is driven, the photosensitive drum 14 is rotated via the main gear trains G1 to G5, via the relay gear G8, and the drum shaft gear G17.
With the relay gears G1, G2, G3, G11, G12,
The developing sleeve 30 is rotated together with the mixer 37 in the developing container main body 32 via the shaft gears G13 and G14 to form a developer rubbing area between the photosensitive drum 14 and mixing. Then, after the mixing time of the developer is completed, the feed clutch 41 is turned on by a command from the control ICC / U constituting the control unit, and the relay gear G
5. The paper feed roller 11 rotates via the shaft gear G31 and the paper feed clutch 41. This allows the friction pad 22
With the paper feed roller 11 controlling the double feed by the
The upper recording paper is fed to the position of the paper detection sensor 12 and the paper detection sensor 12 is turned on.

At this time, if the trailing edge detection sensor 19 does not rotate even if the paper feed roller 11 rotates, it is determined that there is no paper in the placing section 5 and the rotation of the main motor M is stopped. Then, based on the detection signal of the sensor 12, video data is output from the image controller side to control the lighting of the LED elements on the LED board, and the LED unit 7 controls the photosensitive drum 14
Start exposure to the side. In the time chart shown in FIG. 3, Ta is a time constant, and Tb is a developing mixing time.
At this time, if the length of the recording paper conveyance path 10 from the detection position of the sensor 12 to the transfer position is set shorter than the circumference of the photosensitive drum 14 from the exposure position to the transfer position, it is impossible to synchronize the paper detection timing and the exposure timing. Will be possible. Therefore, in the present embodiment, the length of the recording paper conveyance path 10 from the detection position of the sensor 12 to the transfer position is set to be the same as the circumference of the photosensitive drum 14 from the exposure position to the transfer position. Accordingly, it is easy to synchronize the exposure time with the detection time of the sensor 12, and it is possible to form a smooth image.

After the recording paper is fed, the paper feed roller 11
A predetermined time (Tc) after detecting the trailing edge of the recording paper.
Later, Tc is set so that the clutch 41 is disengaged and the paper feed roller 11 rotates without load. When the trailing edge detection sensor 19 is turned off before the leading edge of the recording sheet is bitten by the fixing roller pair 15 as in the case of a business card size, the trailing edge of the recording sheet is changed to the sheet feeding roller 11 after a predetermined time has elapsed. , The clutch 41 is turned off, and the feeding of the next paper is prevented.

On the other hand, the transfer roller 13 is connected to the main motor M
, Through the relay gears G4, G21, G22 and the shaft gear G23, and the fixing roller 15a (heat roller)
Are the external gears G21a, G24, G25 of the relay gear G21.
The paper discharge roller 16 further rotates via the shaft gear G26 of the fixing roller 15a, the relay gear G27, and the shaft gear G28 of the paper discharge roller 16 via the shaft gear G26. Therefore, all the rollers and the photosensitive drum 14 rotate as long as the rotation of the main motor M continues.

The transfer roller 13 is connected to the detection sensor 12
After a lapse of a predetermined time (Te) after the detection of, the transfer bias T / C is applied when the start end of the recording paper reaches the transfer roller, a predetermined transfer is performed, and the image is fixed by a pair of fixing rollers. The paper is discharged to the apparatus upper surface 2 by the paper discharge roller 16. The application time of the transfer bias T / C follows the ON time of the paper detection sensor, and is turned off when a predetermined time (Te) has elapsed after the detection of the detection sensor. When a jam occurs in the transport system based on a detection signal from the jam sensor, the paper is discharged from the back side of the fixing roller 15b (press roller) together with the transfer roller 13 around the support shaft 17 as shown in FIG. The paper roller 16 and the hatched portion reaching the paper discharge section on the upper surface of the apparatus are opened, and the urging force of the elastic member urged by the press roller 15b of the fixing roller pair is released, so that the jagging process can be easily performed. Can be done.

[0033]

As described above, according to the present invention, not only the drive motor and the paper feed clutch, but also the electrical connection between the process means and the substrate or between other substrates can be performed substantially without a harness. With this arrangement, the disconnection accident is reduced, the assembly and maintenance and inspection are facilitated, and the ease of assembly repair and maintenance and inspection are maintained even when the harness itself is eliminated. And so on.

[Brief description of the drawings]

FIG. 1 is an overall layout diagram according to an embodiment of the present invention.

FIG. 2 is an overall layout diagram showing a drive system centered on a recording paper transport system.

FIG. 3 is a control block diagram focusing on a recording paper transport system.

FIG. 4 is a time chart mainly showing a recording paper conveyance system.

FIG. 5 is a perspective view showing a layout of a frame and various printed circuit boards.

FIG. 6 is a top view of FIG. 5, showing the positional relationship between the processing means and the frame.

FIG. 7 is a partial top view illustrating an arrangement relationship between a sheet feeding roller and a frame.

[Explanation of symbols]

 Recording paper transport path 10 Photoconductor drum 14 Conductive system G1 Frame 51 Single printed circuit board 52 Drive motor M Connector 51a Paper feed roller 11 Paper feed clutch 41 Paper detection sensor 12 Photoconductor drum 14 Transfer roller 13

Continuation of the front page (56) References JP-A-64-25159 (JP, A) JP-A-4-186900 (JP, A) JP-A-60-37564 (JP, A) JP-A-1-251053 (JP, A) JP-A-4-242268 (JP, A) JP-A-62-127759 (JP, A) JP-A-1-1933753 (JP, A) Japanese Utility Model Application No. 59-37864 (JP, U) Japanese Utility Model Application 61-44653 (JP, U) Actually open 1988-149164 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 15/00 550 G03G 21/16-21/18 B41J 29 / 00-29/02

Claims (2)

(57) [Claims] 1. A photosensitive drum located on a recording paper conveyance path.
Torque to at least several process means, including
The conduction systemOn one sideArranged frameOn the other side of
Adjacent one printed circuit board in parallelImage forming equipment
In place Face-to-face arrangement of the conduction system with the process means
Let me Said Printed boardOn the opposite side of the other side of the frame
FaceAttach the drive motor directly to theRotation of the drive motor
A shaft through the printed circuit board and the frameSaid
FrameSaid one sideTo the side,SaidDrive to conduction system
Transmit powerAnd No conduction system exists between the frame and the printed circuit board.
Configured as An image forming apparatus characterized in that: 2. The other of the frame of the printed circuit board
Of the main board for image processing on the face side, and on both end side of the printed circuit <br/> board, wherein is perpendicular to the arrangement direction of the printed board arranged control panel board and the power supply board is, these The image forming apparatus according to claim 1, wherein each of the substrates is configured to be directly attachable via a connector without passing through a harness.