JPH07295404A - Image formation device - Google Patents

Abstract

PURPOSE:To make an image formation device possible to be simply and certainly manually operated and to perform a stable image formation and recording for a long period of time by providing wires for reciprocating a support member for supporting a cleaning member for cleaning electric discharge wires. CONSTITUTION:A channel-shaped metal frame 351 is provided inside a transcribing belt in which a transcribing electrode wire 352 is stretched. And, the support frame 354 of the cleaning member of a transcribing electrode wire 352 presses the wire 352 so that the wire 352 is enveloped by means of an adequate pressing force from the upward and it sides towards the transcribing electrode wire 352 and so that dirt such as the electric discharge oxide on the transcribing electrode wire 352 is wiped off. On the other hand, the support frame 354 is bonded via an elastic member to a holder 356 sliding on the guide rail along the channel-shaped metal frame 351 and an elastic member, and pins are implanted therein. On this pin, one part of a drive wire 359 is bonded. And, its both ends are bonded on and fixated to a manual knob 358 and endlessly set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning mechanism for corona discharge electrodes in a transfer device provided in a process cartridge of an electrophotographic image forming apparatus, and a means for facilitating and ensuring cleaning operation thereof.

[0002]

2. Description of the Related Art In a clamshell two-division type electrophotographic image forming apparatus, a transfer electrode wire in a transfer section is exclusively used for the transfer electrode wire in a lower main body with an upper main body being lifted upward. It is possible to bring the cleaning tool into contact with the cleaning tool to manually wipe off dirt such as discharge oxides and other deposits.

However, in a transfer belt device equipped with an endless transfer belt which runs around a transfer roller on the outside of the transfer electrode, a transfer electrode is inside the transfer belt, so a cleaning tool should be inserted. , Manual cleaning was not possible.

Further, in the case of cleaning by manual operation, it is often forgotten to return the cleaning member to the original position, and there is a problem that printing proceeds without the user's knowledge. To solve this problem, a fool-proof mechanism has been proposed, which has a clamshell type and is divided into two parts so that the upper main body cannot be closed with respect to the lower main body, or an interference portion is provided so that the detached process unit cannot be mounted. There is.

[0005]

In such a prior art example, since a dedicated cleaning member is manually brought into contact with and slides on the electrode wire to perform cleaning, the periphery of the electrode wire may be damaged due to an operation error,
The loss of the cleaning tool and the trouble that normal image formation cannot be performed due to the loss of the tool cannot be ruled out.In the transfer belt device, the transfer electrode wire running inside the belt can be cleaned manually by using the dedicated cleaning tool. It was very difficult to clean it.

However, there is also a method of automatically cleaning the wire, but it has drawbacks that the mechanism is complicated and the manufacturing cost is high.

Further, in the case of manual cleaning, a fool-proof mechanism is provided in order to forget to return the cleaning member to the home position, and the upper body and the lower body are not closed. On the contrary, there is a problem in that the frame of the electrode wire is deformed or damaged due to the accidental closing due to the damage and the charging performance is significantly impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus which solves the above problems of the prior art.

[0009]

This object is achieved by any one of the following technical means a, b, c and d.

(A) A corona electrode, a cleaning member for rubbing against the discharge wire of the corona electrode to clean the discharge wire, and the cleaning member are supported by the lower main body of the main body which can be divided into two parts by the paper feeding path. Support member and transfer member (recording paper) for the support member
Of the first slide mechanism that enables reciprocal movement in a direction orthogonal to the movement of the support member, a movable knob that is a power source for moving the support member, and the knob in a direction orthogonal to the movement of the transfer material (recording paper). An image forming device comprising: a second slide mechanism that enables reciprocal movement; a wire that reciprocates the support member according to movement of the knob; and a suspension mechanism that suspends the wire. apparatus.

(B) The distance between the side end of the transfer material (recording paper) and the cleaning member moves relative to each other in a relationship substantially equal to the distance between the other side end of the transfer material (recording paper) and the knob. The image forming apparatus according to item a.

(C) The image according to item (a) or item (b), wherein the second slide mechanism is provided on the downstream side in the moving direction of the transfer material (recording paper) with respect to the transfer material conveying section. Forming equipment.

(D) The transfer material transport unit is located upstream of the transfer direction of the transfer material (recording paper) with respect to the second slide mechanism, and circulates outside the corona electrode to transfer the transfer material to the corona electrode ( Transfer paper (recording paper) on the downstream side of the moving direction of recording paper)
A, b having a transfer belt for transporting
The image forming apparatus according to any one of 1 and c.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described together with its operation with reference to the drawings.

FIG. 1 is a sectional view showing the schematic arrangement of a color laser printer which is an image forming apparatus according to an embodiment of the present invention. First, based on this figure, an outline of the entire configuration and operation will be described.

The photosensitive drum 10 as an image carrier having an OPC photosensitive layer coated on its surface is in one direction (clockwise in the figure).
After being driven and rotated by the PCL 11, the charge is removed by the PCL 11 to remove the charge at the time of the previous print, and the peripheral surface is uniformly charged by the charger 120 to prepare for a new print. After this uniform charging, the image exposure means 13 performs image exposure based on the image signal. The image exposure means 13 rotates and scans a laser beam emitted from a laser light source, which will be described later, by a rotary polygon mirror 13A, bends an optical path by a reflection mirror 13C via an fθ lens 13B and the like, and is charged in advance with the photosensitive drum 10. A latent image is formed on the surface of the photosensitive drum 10 by being projected onto the peripheral surface of the.

Around the periphery of the photosensitive drum 10, there are developed developers each composed of a mixture of toner such as yellow (Y), magenta (M), cyan (C), black (K) and a magnetic carrier. A filled developing device 14 is provided. The toner is replenished to each developing device from the toner hopper 40 of each color through the pipes 44, 45, 46 and 47 in a timely manner. First, the sleeve roller 14S for developing the first color rotates while holding a developer by incorporating a magnet.
Done by The developer is regulated to have a predetermined thickness on the sleeve roller 14S by the layer forming rod and is conveyed to the developing area. An AC bias voltage VAC and a DC bias voltage VDC are superimposed and applied between the photosensitive drum 10 and the sleeve roller 14S. Here, the potential of the exposed portion of the photosensitive drum 10 is VL, the surface potential of the charged photosensitive layer other than the exposed portion is VH, and the DC bias voltage VDC is | VH
By setting so that |> | VDC |> | VL | Lower potential VL
Adheres to the exposed portion of, and is visualized and developed.

After the development of the first color is completed in this way, the image forming process of the second color (for example, magenta) is started.
The photosensitive drum 10 is uniformly charged again, and a latent image based on the image data of the second color is formed by the image exposure means 13. For the third color (cyan) and the fourth color (black), the same image forming process as for the second color is performed, and a total of four colors are developed on the photosensitive drum 10.

On the other hand, the paper feed cassette 21 or the manual feed port 24
The recording paper P, which is the transfer material fed from the paper feed mechanism 22 from the paper feeding mechanism 22, is formed between the photoconductor drum 10 and the transfer belt 331 by the transfer belt device 300 in which the transfer belt 331 is stretched. Area) 335, photoconductor drum 1
The multicolor image on the 0th circumferential surface is collectively transferred to the recording paper P. Here, a high voltage is applied to the shaft 332a of the upstream holding roller 332 of the transfer belt 331, and the transfer belt 331 is applied to the shaft 332a.
The conductive brushes 334 installed at positions facing each other with the sheet sandwiched therebetween are grounded, and the recording paper P that has been fed has the brush 334.
Between the transfer belt 331 and the transfer belt 331, and the electric charge injected into the recording paper P from the brush 334 causes the transfer belt 331 to be sucked into the transfer area. The recording paper P separated from the photoconductor drum 10 is the holding roller 3 on the downstream side which stretches the transfer belt 331.
The shaft 333b of 33 serves as a counter electrode and is separated from the transfer belt 331 while being discharged. It should be noted that the transfer belt 331 is separated from the photosensitive drum 10 about the shaft 333b of the holding roller 333 on the downstream side as a rotation center during the formation of the multicolor image.

Recording paper P separated from transfer belt device 300
Is conveyed to a fixing device 23 composed of two pressure-bonding rollers having a heater inside at least one of the rollers, and heat and pressure are applied between the two pressure-bonding rollers to melt the adhered toner. , After being fixed on the recording paper P,
It is conveyed upward through the transport guide 25 and is carried out of the apparatus.

The toner remaining on the peripheral surface of the photosensitive drum 10 after the transfer is discharged by the static eliminator 15 and reaches the cleaning device 16, and the cleaning blade 16a contacting the photosensitive drum 10 causes the toner inside the cleaning device 16 to be removed. Toner box 17
Is stored in. The photoconductor drum 10 from which the residual toner has been removed by the cleaning device 16 is neutralized by the PCL 11 and then uniformly charged by the charger 120 to start the next image forming cycle. Further, the recording paper P is the transfer belt 331.
If it is wound around the photoconductor drum 10 without being separated from the above and enters above the static eliminator 15, the cleaning blade 16a and the electrode wire may be damaged. Therefore, the jam sensor 336 for early detection of the winding of the recording paper P is used. It is mounted near the static eliminator 15.

The above is the description of the state in which the upper body 1B and the lower body 1A are closed and the image formation is operable. However, in order to open the upper body in FIG. 2, about 45 ° around the support shaft 2. The configurations of the upper body 1B, the lower body 1A, and the process cartridge 100 will be described with reference to the rotated schematic diagram.

The lower body 1A includes a paper feed cassette 21 and a paper feed mechanism.
22, the transfer belt device 300 and the fixing device 23 are installed,
An image exposure unit 13, a developing unit 14, a toner hopper 40, etc. are incorporated in the upper main body 1B, and further, the photosensitive drum 10, the PC
A process cartridge 100 incorporating the L11, the charger 120, the static eliminator 15, the cleaning device 16, the collected toner box 17, etc. is detachably provided in the upper body frame 18 of the upper body 1B.

On both sides of the process cartridge 100, a mounting guide pin 157 is provided at a position corresponding to the central axis of the photosensitive drum 10, and another mounting guide pin 158 is provided at a position slightly shorter than the drum radius. Is provided. Upper body 1
By rotating B about the support shaft 2 of the lower main body 1A by about 45 °, the right manual feed guide is also rotated and opened with another support shaft as a fulcrum.

In this way, the upper main body 1B is opened at approximately 45 °, and the process cartridge 100 is ready for attachment / detachment.
When 7 and 158 are inserted and mounted so as to slide along the guide grooves 18A and the mounting surface 18B provided on the upper main body frame 18 on both sides of the upper main body 1B, the mounting guide pin 157 has the bottom portion of the guide groove. The other guide pin 158 is placed on the mounting surface 1
It can be placed on 8B. A bulge portion 18C is provided at the end of the mounting surface 18B so that the guide pin 158 cannot easily get over even if the guide pin 158 is accidentally moved against the weight of the process cartridge 100. Then, in this state, the support portion at the first position is formed,
The process cartridge 100 is safely placed in the first position.

A clamp mechanism 150 is provided on both sides of the rear part of the process cartridge 100. This is because the clamp lever 151 rotatably supported by the support shaft 152 is connected to the frame of the process cartridge 100 and the clamp lever 151.
A coil spring 153 applied between the two is urged to rotate counterclockwise.

A hook 151B is formed at the upper end of the clamp lever 151, and the lever 151 is rotated clockwise with a finger against the bias of the coil spring 153 at the lower end in the left direction of the drawing. A knob 151A that can be used is provided.

On the other hand, support pins 155 at the second position are provided on both sides of the upper body frame 18.

The process cartridge in the first position
The hook 100B is rotated about 45 ° about the pin 157 as a fulcrum, and when the hook 151B is guided by the support pin 155 against the urging force of the spring 153, the hook 151B ends. The support pin 155 is clamped by the force and is mounted in the state shown in the overall schematic sectional view of FIG. In this way, the support portion at the second position is formed. At this time, the recording paper P is made by the frame surface 266A of the upper main body 1B and the end surface 226B of the process cartridge 100.
Is formed. This is the mounted state of the second position.

To remove this and return it to the state of the chain double-dashed line in FIG. 3 or the state of the first position shown in FIG. 2, the process cartridge is slightly lifted while the knob 151A is operated.
Hook 151B with pin 1
It can be removed from 55 and returned to the first position.

The process cartridge 100 is detached from the upper main body 1B by moving the process cartridge 100 so that the mounting guide pins 157 and 158 are separated from the guide groove 18A and the mounting surface 18B. It becomes possible to dismantle.

Now, when the upper body 1B is opened, that is, when the process cartridge 100 is in the second position, the transfer is performed by manually moving the knob 358 of the transfer belt device 300 in the direction perpendicular to the paper surface of FIG. It can be seen that the pole wire cleaning is very easy and easy.

Cleaning of the transfer belt device will be described later.

However, it is impossible to clean the charger in the second position. Therefore, by providing the first position as shown in FIG. 2, the knob 122 can be manually slid in the direction perpendicular to the paper surface of FIG. 2 while the process cartridge 100 is mounted on the upper main body. Can be cleaned.

Moreover, since the electrodes can be cleaned while the cartridge 100 is mounted on the upper body 1B or the lower body 1A, there is no need to worry about damaging the photosensitive drum or the like.
Returning to the normal printing state becomes extremely quick and easy.

Next, the cleaning means for the belt electrode and the cleaning means for the transfer electrode in the transfer belt device will be described with reference to the drawings.

First, a plan view of FIG. 4, a side sectional view of FIG. 5, FIG. 7 which is a BB view of FIG. 5, and FIG. 8 showing a state when the state of FIG. The means for cleaning the band electrode will be described with reference to the plan views of FIG. 6 showing the operation of the home position detecting means (sensor) when the home position is present and when it is not. The electrode wire 123 used for the band electrode is stretched by a constant tension between insulating walls provided at both ends of the channel-type metal frame 121.
Then, a high voltage is applied during the printing process. A grid is provided on the bottom of the channel-type metal frame 121. A slide plate 131 is provided inside the metal frame 121.
A bearing portion 127 that allows the two support members 124 to rotate,
The support member 124 is pivotally supported and the torque spring 126 is attached to both support members 12
It is urged to urge 4 toward.

A cleaning member 125 is fixed to the support member 124, and the electrode wire 123 is pressed and sandwiched by the urging force at the cleaning position.

The plate 131 inside the channel-type metal frame 121 is a knob provided outside the metal frame 121.
122, a threaded pin 132, and a nut 133. The electrode 122 can be cleaned by manually sliding the knob 122 along the long hole of the channel-type metal frame 121 and reciprocating the coupling portion.

As shown in FIG. 7, the knob 122 and the support member 1
The cleaning member 125 and the cleaning member 125 integrally clean the electrode wire 123. However, if a printing operation is started without leaving the electrode wire 123, various harmful effects will occur as described later.

In order to prevent this, it is necessary to always return to the home position (hereinafter simply referred to as HP).

As shown in FIG. 8, the fixing member 12 is attached to the insulating wall 121A provided at one end of the channel type metal frame 121.
8 are provided. This is made in a harpoon shape, with the tip becoming thinner and thicker, and then becoming thinner again when the maximum width is exceeded. HP is the position where the support member 124 and the knob 122 return to the vicinity where they hit the insulating wall in the vicinity of the taper.

When attempting to manually return the knob 122 to the HP, the support member 124 is gradually opened by the harpoon type fixing member 128, and the support member 124 is stopped at the point where the maximum width portion is overcome and the HP is stopped.
Reach

At this time, since the cleaning member 125 is separated from the electrode wire 123 together with the supporting member 124, the influence of the high voltage can be prevented from deteriorating the cleaning member 125.
Further, the electrification voltage from the electrode is also uniform in the length direction, which is desirable.

Now, when the knob 122 comes to this HP, FIG.
As shown in Figure 13, the process cartridge set blocking member 13
Since 4 is pushed to a position where the block is released by the knob 122, the upper main body 1B and the process cartridge 100 attached thereto are closed to the lower main body 1A without any trouble, and the open / close switch SW2 is turned on, which serves as HP detection means described later. It becomes possible to enter a normal operating state by the ON signal of the sensor.

By the way, the set blocking member 134 is connected to the frame of the process cartridge 100 by the pin 136 through the two elongated holes 135, and the spring 137 is provided between the blocking member 134 and the frame. The set blocking member 134 is urged toward the side that always blocks the set.

In this way, if the knob 122 is returned to the HP, it can be handled without any problem. H
When it has not returned to P, the set blocking member hits a portion of the upper main body frame 1B having a high rigidity so as not to be closed further, and the device is prevented from being damaged.

By the way, anyway, this is the knob
Since it does not prevent forgetting to return 122 to HP, it is better to provide a separate detecting means for this.

This is realized by providing the protrusion 122A on the knob 122 as shown in the plan view of FIG. 6 and by the H shown by the solid line in FIG.
When the knob 122 comes to the position of P, the projection 122A crosses the sensor beam composed of the projector 122C and the photoreceiver 122D as the detection means provided in the upper main body 1B or the process cartridge to generate a signal and come to HP. Based on this signal, a signal indicating that the image forming apparatus is ready for operation, that the upper main body 1B and the lower main body 1A are connected to each other, or that the process cartridge 100 is ready to be installed can be output. . Further, when the knob 122 is located at the position shown by the chain double-dashed line in FIG. 6 and the signal cannot be generated without crossing the sensor beam, all prohibiting means are activated.

The flowchart and circuit diagram for this are shown in FIGS. 9 and 10.

First, in step 1, power-on switch SW1
Alternatively, it is checked whether or not the upper body start switch SW2 has operated from OFF to ON.

That is, the power-on switch is turned on from off.
Then, it is checked whether or not it has been started up or whether the upper body 1B has moved from the open state to the closed state.

Instead of such a change, SW1 is turned ON →
A change such as turning OFF or SW2 changing from ON to OFF is not recognized as a change, and it is judged as NO. In this case, the image forming operation is started as soon as other conditions are satisfied.
It is possible to wait for the state to proceed to 5. Then, if the other condition signals become OK, Step 5 is executed and the steady image formation is performed.

Then, in Step 1, SW1 or SW
If 2 is turned from OFF to ON, that is, if it is YES, the process proceeds to Step 2 to determine whether the electrode cleaning tool has returned to HP by the HP detection sensor signal.
Is confirmed and if YES, the process proceeds to Step.5, and Step.5 is executed.

In Step.2, HP is not in HP
When confirmed by the detection sensor (when there is no signal)
In Step.3, transition to image forming operation was prohibited,
Furthermore, in step 4, HP is displayed together with the cleaning tool position check display
A return instruction is given. Then, the HP detection sensor operates when the user moves it to the HP position.
Step 2 changes to a YES signal and the process proceeds to step 5 to execute the shift to the image forming operation.

The above is expressed in a control circuit diagram as shown in FIG.

24VDC and 5VDC of the DC power supply are AC100V
It is designed to be made by turning on the main switch SW1.

The AC driver board is a board that controls the AC load, and the load is controlled by four signals from the control board.

That is, M2 is an AC developing motor, and L1 is a fixing heater controller. Also, interlock SW
2 is a micro switch MS1 for ON / OFF of 24VDC
And corresponds to an open / close switch for the lower body 1A of the upper body 1B.

Further, as an interlock switch attached to the interlock switch SW2, MS2 and MS3 directly turn on / off the 5V power source toward the laser driver substrate.
F. From this perspective, the laser driver circuit is forcibly shut off when the clamshell type upper body is opened or the developing door is opened from the viewpoint of safety.

Then, when the HP detection signal is input to the control board to detect when SW1 or SW2 changes from OFF to ON, it is determined that the image forming process is normally performed, and the execution of the command is instructed. is doing.

Next, a cleaning device for the transfer electrode wire 352 of the transfer belt device 300 is shown in a side sectional view of FIG. 11, a plan view of FIG. 12, and HP shown in FIGS. 13 (a), (b) and (c) and a cleaning state. Will be described with reference to the sectional view of FIG.

Holding rollers 332, 333, tension roller 33
A semi-conductive transfer belt 331 is endlessly wound around 4.

A channel-shaped metal frame 351 is provided inside the transfer belt 331, and a transfer electrode wire 352 is provided therein.
Is stretched. Then, the supporting frame 354 of the cleaning member 354A of the transfer electrode wire 352 is pressed from above by wrapping the wire 352 with an appropriate pressing force, and is slid toward the transfer electrode wire 352, so that the transfer electrode wire 352 It is designed to wipe off stains such as discharge oxides.

On the other hand, the support frame 354 has a holder 356 that slides on the guide rail 355 along the channel-shaped metal frame 351, and an elastic member (leaf spring) 370 as shown in FIGS. 13 (a) and 13 (b). Is connected via the pin 357
Has been planted. One of the drive wires 359 on the pin 357
The points are combined.

Then, 4 of the base 360 of the transfer belt device 300
The drive wire 359 is suspended and guided by suspension guide members 363, 364, 365, 366 provided at the positions, and both ends of the drive wire 359 are fixedly connected to a manual knob 358 for endless setting.

When the knob 358 is at the HP at the right end in the figure, the cleaning member 354A and its supporting frame 354 and the holder 356 are located at the HP at the left side in the figure. And Figure 13
As shown on the left side of the sectional views of (a) and (c), the support frame 35
The inclined portion 372 provided on the 4 is the HP of the guide rail 355.
It is dropped in the window 355H opened at the position. This is done by the urging force of the U-shaped elastic member (leaf spring), but the support frame 354 jumps up together with the cleaning member 354A to the state shown in FIG. 13 (a) and separates from the electrode wire. The application of high voltage to the electrode wire 352 is not hindered and the transfer function can be achieved.

When the electrode wire cleaning operation is started,
As shown on the right side of the sectional views of 13 (b) and 13 (c), the supporting frame
The slanted portion 372 of the 354 smoothly rides on the guide rail 355 by utilizing the slanted portion, so that the biasing force of the elastic member 370 presses the electrode wire 352 by the cleaning member 354A to wipe off the contaminants. I am doing it.

When the transfer electrode wire 352 is cleaned, the knob 358 on the HP is slid to the left, and further reciprocated by sliding it to the right.

When the cleaning is completed, it is possible to return to HP and start the image forming process such as printing again.

Here, the cleaning member 354A and its supporting frame 354 move at the same distance in the right and left opposite directions with respect to the center position of the knob 358 and the transfer electrode in the longitudinal direction. Therefore, the HP can be placed in both the left and right directions, but in this embodiment, it is provided on only one side.

Further, if the user forgets to return to the HP, the same trouble as in the case of the above-mentioned band electrode occurs. Therefore, if the user forgets to return to the HP, the closing prevention member of the upper main body 1B is provided to release it at the HP. Alternatively, if the main body is not closed or the image formation start is prohibited if the main body is not returned to the HP, the main body close or the image formation start may be performed in accordance with the signal. It can be performed in the same manner as in. Further, one of the features of the present invention is that the cleaning knob 358 slides at a right angle on the conveyance path after the transfer of the recording paper P, so that the cleaning member 354A starts the image formation without being returned to HP by mistake. Even if it happens, the knob that moves in an anti-symmetrical manner will always block or obstruct the recording paper transport path, causing a jam, which will prompt the user to forget to return to the HP at an early stage. As a result, it is possible to prevent the cleaning member from contacting the electrode wire and continuing the image formation while the high voltage application is unstable.

Apart from that, the transfer belt 331 according to the present invention
The transfer electrode housed underneath can now be manually and easily cleaned, which has been almost difficult until now.

Of course, the above-described cleaning device can be applied almost as it is to a normal type transfer device having no transfer belt.

Further, the cleaning of the charger and the grid of the transfer device can be configured in substantially the same manner as the cleaning device of the electrode wire.

[0076]

According to the present invention, the transfer electrode wire of the transfer device attached to the lower body can be easily and reliably operated manually even if it is stored in the endless transfer belt. This makes it possible to prevent a failure or a performance failure due to the deformation and damage of the transfer unit or the main body, and it becomes possible to perform stable image forming recording for a long period of time.

Further, even if the user forgets to set the electrode wire cleaning device at the home position (HP), he must immediately make a correction to prevent damage due to abnormal transfer and contamination in the device.

Moreover, since the mechanism is a simple and reliable manual system, it can be installed at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall outline of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the upper main body of the embodiment of the present invention is opened and the process cartridge is horizontal.

FIG. 3 is a cross-sectional view showing a state where the upper main body of the embodiment of the present invention is opened.

FIG. 4 is a plan view of a strip electrode cleaning device according to the present invention.

5 is a sectional view taken along line AA in FIG.

FIG. 6 is a plan view showing home position detecting means of the cleaning knob.

FIG. 7 is a partial plan view showing a state where the cleaning member cleans the strip electrode wire.

FIG. 8 is a partial plan view showing the opening of the cleaning member when the cleaning member is at the home position.

FIG. 9 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 10 is a circuit diagram of an embodiment of the present invention.

FIG. 11 is a side sectional view of the transfer belt device according to the present invention.

FIG. 12 is a plan view of the transfer belt device according to the present invention.

FIG. 13 is a cross-sectional view showing when the cleaning device is in the HP and cleaning states.

[Explanation of symbols]

 1A Lower body 1B Upper body 2 Rotating support shaft 10 Photosensitive drum 11 PCL 13 Image exposure means 14 (14A, 14B, 14C, 14D) Developer 14S Sleeve roller 18 Upper body frame 18A Guide groove 18B Mounting surface 18C Raised part 21 Paper feed cassette 40 Toner hopper 100 Process cartridge 120 Charger 121 Channel type metal frame 122 Knob 123 Electrode wire 124 Supporting member 125 Cleaning member 126 Torque spring 127 Bearing section 128 Fixing member 131 Slide plate 134 Set blocking member 136 Pin 137 Spring 150 Clamp mechanism 151 Clamp lever 151A Knob 151B Hook 153 Coil spring 155 Support pin 157,158 Placement guide pin 300 Transfer belt device 331 Transfer belt 332 Holding roller 333 Holding roller 335 Transfer area 351 Channel metal frame 352 Transfer electrode wire 354 Support Frame 354A Cleaning member 355 Guide rail 355H Window 356 Holder 357 Pin 358 Knob 359 Drive wire 360 Base 363, 364, 365, 366 Suspension guide member

Claims (4)

[Claims] 1. A corona electrode, a cleaning member for rubbing against a discharge wire of the corona electrode to clean the discharge wire, and a support for supporting the cleaning member, on a lower main body of the main body which can be divided into two in a paper feeding path. A member, a first slide mechanism that allows the support member to reciprocate in a direction perpendicular to the movement of the transfer material (recording paper), a movable knob that is a power source for moving the support member, and the knob. A second slide mechanism that allows reciprocal movement in a direction orthogonal to the movement of the transfer material (recording paper), a wire that reciprocates the support member according to the movement of the knob, and the wire is suspended. An image forming apparatus comprising: a suspension mechanism. 2. A distance between a side end of the transfer material (recording paper) and the cleaning member moves in a relationship substantially equal to a distance between the side end of the transfer material (recording paper) and the knob. The image forming apparatus according to claim 1, wherein: 3. The image forming apparatus according to claim 1, wherein the second slide mechanism is provided on the downstream side of the transfer material transport unit in the moving direction of the transfer material (recording paper). apparatus. 4. The transfer material conveying unit is located upstream of the transfer material (recording paper) in the moving direction of the transfer material (recording paper) with respect to the second slide mechanism, and circulates outside the corona electrode to transfer the transfer material (recording material) to the corona electrode. A transfer belt for transporting the transfer paper (recording paper) is provided on the downstream side in the moving direction of the paper).
The image forming apparatus according to any one of 3 above.