JPH03120573A - Electrophotographic image forming device - Google Patents

Abstract

PURPOSE:To easily attach and detach a cleaning member by providing a fixing and cleaning member on the bottom surface of the drum cartridge of a turning part and press-contacting the fixing and cleaning member to a fixing roller inside the fixing unit of a pedestal part when the turning part is closed. CONSTITUTION:The fixing and cleaning roller 550 is provided on the bottom surface of the drum cartridge 500 attached to the turning part 700. The roller 550 is press-contacted to the fixing roller 163 which is provided on the pedestal part 800 by a spring 521 when the turning part 70 is closed. The toner of a recording sheet carried from a transfer part is fused by the rollers 163 and 163a and the toner adhering to the surface of the roller 163 is cleaned by the roller 550. This mechanism facilitates the attachment and detachment of a fixing cleaning member and correctly deals with a replacement period, and maintenance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a fixing cleaning device in a clamshell type electrophotographic image forming apparatus.

[Conventional technology]

Conventionally, in electrophotographic image forming apparatuses, a photoreceptor drum and a developing device are included in one removable unit, or they are separated into one unit including the photoreceptor drum and one unit including the developing device. Some were made to be removable.

In addition, the developing device unit is such that only the developing device is removable, and the toner replenishment tank and toner replenishment device are not attached or removed while attached to the image forming device.
There is also a system in which the tank and the toner replenishing device are not particularly provided, and when the toner contained in the developing device is used up, the developing device is replaced with a new one and the developing device is discarded.

By making the photoreceptor drum and developing device removable in this way, it becomes easier to inspect and clean every inch of the interior, and each unit can be removed externally independently for inspection and cleaning. I was able to proceed with the work very efficiently.

Furthermore, each unit has a durability limit on the number of times it can be used repeatedly, and a method has been taken in which the entire unit is replaced at a certain limited number of times, that is, the durability limit.

Conventionally, the electrophotographic image forming apparatus (hereinafter simply referred to as an image forming apparatus) configured in this manner is of the so-called Talam shell type, and is divided into a rotating part and a base part, which can be opened and closed, and when opened, the above-mentioned operations can be performed. There was one that had a structure that made it easy to do so, and it was quite compact. Then, when the image forming apparatus is closed, a main switch for driving the apparatus provided in the image forming apparatus is turned on, and after a predetermined setup process, a required copying switch is turned on, so that the image recording operation of the apparatus is started. be.

[Problem to be solved by the invention]

Normally, as described above, the image forming apparatus requires maintenance when it has been used a certain number of times. Therefore, for example, in the above-mentioned apparatus which frequently performs recording, the charging electrode and the photoreceptor become dirty or deteriorate, so that the drum cartridge is often removed from the rotating part to perform predetermined maintenance such as cleaning or replacement. Similarly, a fixing roller in a fixing device installed in the base section also serves as a part of the toner when the toner transferred onto the recording paper surface by the transfer section of the image forming apparatus is fused in the fixing process. portion adheres to the surface of the fixing roller and becomes dirty. As the number of fixing processes increases, the surface of the fixing roller becomes increasingly dirty.

Therefore, in order to remove the toner that has adhered to the fixing roller, a cleaning roller that rotates while being in pressure contact with the surface of the fixing roller is usually provided to transfer and remove the toner that has adhered to the fixing roller, or a cleaning blade is used to remove the toner that has adhered to the fixing roller. A cleaning means is used in which the toner is scraped off from the surface of the fixing roller and the scraped off toner is absorbed by a sacsiphon. For example, in the case of the cleaning roller, as the number of fixing processes increases, the adhesion of transferred toner accumulates and the surface becomes increasingly dirty.

Similarly to the charging electrode and the photosensitive drum, the cleaning roller is also subjected to maintenance such as cleaning and replacement when it has been used a certain number of times. Normally, the life of the photosensitive drum used in the image forming apparatus is set to be 20,000 to 30,000 prints. Similarly, the cleaning roller is replaced when its life reaches the same number of sheets as the drum.

As mentioned above, since the photosensitive drum is attached to the rotating part as a unit together with the charging electrode and the like in the cartridge, it can be attached and detached very easily. However, one of the cleaning rollers is generally installed integrally within the fixing unit disposed on the base side. Furthermore, since the fixing device contains a heat source, it is surrounded by a housing for the fixing device, and furthermore, an air cooling fan is used to prevent heat from accumulating inside the machine. Therefore, it is very difficult to clean and inspect the fixing device if it remains as it is. Furthermore, if a recording paper jam trouble occurs in the fixing device, the problem cannot be recovered unless the fixing device or the casing around the fixing device is removed, or each fixing device is removed. In this case, if the cleaning roller of the fuser can be easily separated, it will be easier to perform maintenance work (9 maintenance inspections, troubleshooting, etc.) Since the life cycle of the rollers is the same, they should be replaced at the same time.However, sometimes this replacement involves replacing only the photosensitive drum and forgetting to replace the cleaning roller (or vice versa). (This may also occur in cases where the cleaning roller The roller is attached to the drum cartridge as a means for easily separating the photosensitive drum from the fixing device, which solves the above-mentioned problems, and allows the photosensitive drum and cleaning roller to be removed and replaced at the same time and without error during maintenance. Another object of the present invention is to provide an electrophotographic image forming apparatus that facilitates maintenance and inspection of the interior of the fixing device.

[Means to solve the problem]

The purpose of this is to create a Talamusiel-type electrophotographic photographic device with a structure in which the rotating part rotates around a common shaft relative to the base part, and the two parts, the base part and the rotating part, are opened and closed. In the image forming apparatus, the rotating section has a fixing cleaning member disposed on a lower surface of a drum cartridge to be mounted, and the fixing cleaning member is disposed on the base section when the rotating section is closed. This is achieved by the electrophotographic image forming apparatus characterized in that the fixing roller is brought into pressure contact with the surface of the fixing roller in the fixing device.

〔Example〕

One embodiment of the invention is shown in FIGS. 1-5.

1 and 2 are side sectional views showing the structure of the electrophotographic image forming apparatus of the present invention, and FIG. 1 is also a cross-sectional view taken along line xx' in FIG. It also represents a diagram. FIG. 3 is a top view of an embodiment of the present invention. FIG. 4 is a perspective view of one embodiment of the present invention when the taram shell is opened. FIG. 5(a) is a side sectional view showing a state in which a cleaning roller mechanism is disposed in the drum cartridge of the current electrophotographic image forming apparatus of the present invention. Figure 5(b)
FIG. 2 is a side view of the cleaning roller mechanism.

In the figure, lO is a drum-shaped image carrier, ie, a photosensitive drum, which is driven and rotated clockwise in FIG. 2 and counterclockwise in FIG. Reference numeral 20 represents a charging electrode that applies an electric charge to the photoreceptor on the circumferential surface of the photoreceptor drum 10, and 30 represents a laser writing system unit that is an exposure optical system.

When a laser writing signal is input to the laser writing system unit 30, in the laser writing system unit 30, a laser beam generated by a semiconductor laser (not shown) is applied to a polygon mirror 3 rotated by a drive motor 31.
2, the optical path is bent by three mirrors 34A, 34B, and 34C through an fθ lens 33,
It is projected onto the circumferential surface of the photoreceptor drum IO to which a charge has been previously applied by the charging electrode 20.

On the other hand, when scanning is started, the laser beam is detected by the index sensor, modulation of the laser beam by the first color signal is started, and the modulated laser beam scans the circumferential surface of the photoreceptor drum IO. Therefore, a latent image of the first color is formed on the circumferential surface of the photosensitive drum 10 by the main scanning by the laser beam and the sub-scanning by the rotation of the photosensitive drum 10. This latent image is developed by a developing means containing a developer of, for example, yellow as a first color, and a yellow toner image is formed on the circumferential surface of the photosensitive drum 10. The obtained toner image, while being held on the circumferential surface of the photosensitive drum 10, passes under the cleaning means that is separated from the circumferential surface of the photosensitive drum IO, and enters the next copy cycle.

That is, the photosensitive drum lO is charged again by the charging electrode 20, and then the second
A color signal of
Writing is performed on the peripheral surface using the second color signal to form a latent image. The latent image is developed by a developing means containing developer of a second color, for example magenta.

This magenta toner image is formed over the previously formed yellow toner image.

The toner image thus obtained, while being held on the circumferential surface of the photoconductor drum 10, passes under the cleaning means that is separated from the circumferential surface of the photoconductor drum IO, and enters the next copy cycle.

Similarly, writing using the third color signal is performed on the photoreceptor drum 10 to form a latent image. This latent image is developed by a developing means containing a developer of a third color, for example cyan. This cyan toner image is formed superimposed on the yellow magenta toner image described above.

As described above, a color toner image is formed on the photoreceptor drum IO using the three color toners, but a high-quality color image can be obtained by further overlapping a black toner image in the same manner.

Reference numerals 611A, 611B, 611C, and 611D are developing units that carry out the above-mentioned development and contain respective developers of yellow, magenta, cyan, and black.

As shown in the example of the developing device 611A, each of the developing devices includes a developing roller (developing sleeve) 612 having a magnetic pole fixed on the inside facing the circumferential surface of the photoreceptor drum IO with a predetermined gap therebetween. It is equipped with a pair of stirring rollers 614 and 615 having conveying force in opposite directions, and the stirring roller 614
The developer is supplied to the circumferential surface of the rotating developing roller (developing sleeve) 612 after the toner and carrier components are made uniform by the mixing action of and 615.

A direct current or even alternating current bias is applied to the developing roller (developing sleeve) of each developing device that carries developer.
Non-contact reversal development is performed using a two-component developer.

Charging by the charging electrode 20 provided on the photoconductor drum IO and its periphery, exposure by the laser writing system unit 30 for each color, and developing units 611A, 611B, 6
The development processing by 11C and 611D is performed four times for each color, so that color toner images are formed on the circumferential surface of the photoreceptor drum 10 by overlapping.

Reference numerals 61 and 62 are a first paper feed roller and a second paper feed roller, respectively, which are in a constantly rotating state, and 71 and 72 are paper feed guides having an arcuate shape and a linear shape, respectively.

The recording paper is carried out one by one from the paper feed cassette, and is sent along the paper feed guide 71 by the first paper feed roller 61 to the U.
After turning, that is, turning upside down, the paper contacts the rising portion of the paper feed shutter S that quickly cuts the conveyance path of the paper feed guide 72 and temporarily stops. In this case, the second paper feed roller 62 continues to rotate while slipping on the surface of the recording paper that is in a stopped state.

When the paper feed shutter S retracts downward in synchronization with the rotation of the photoreceptor drum IO carrying the toner image, the recording paper is synchronized with the circumferential speed of the photoreceptor drum IO by the frictional force of the second paper feed roller 62. and is fed to the transfer section.

Reference numeral 80 denotes a rotatable transfer roller, which is electrically charged by applying a voltage, and constitutes a transfer section that transfers the toner image to the recording paper side via a conveyor belt (80B) at the point of contact with the surface of the photoreceptor drum IO. do. Note that the transfer roller 80
A conveyance bell l-80B is stretched between the drive roller 80A which rotates counterclockwise, and the recording paper is transferred while being conveyed by the conveyance bell l-80B. Note that 80C is a cleaning means for cleaning the surface of the conveyor belt 80B.

Reference numeral 90 denotes a front charging electrode located upstream of the cleaning device 100, which charges the electrode to a state where it is easy to remove the residual toner on the circumferential surface of the photosensitive drum 10 from which the toner image has been transferred to the recording paper.

100 is a cleaning device; 110 and 120 are a conductive bristle brush and a conductive collecting roller which are cleaning means of the cleaning device 100; and 130 is a waste toner collecting section that stores the toner collected by the cleaning device 100.

The photosensitive drum 10 that has passed the front charging electrode 90 is brought into sliding contact with the conductive bristle brush 1 by a signal from the control section.
10, the residual toner adhering to the conductive brush 110 is adsorbed by the conductive collection roller 120, and then transferred to the waste toner collection section 13.
Sent to 0.

The waste toner collecting section 130 is provided with a waste toner sending rod 131 and a deformable toner collecting bag 132, and the residual toner, that is, waste toner sent by the collecting roller 120 is sent through the waste toner sending rod 131. Bag member 1
It is housed in 32.

The photosensitive drum IO whose circumferential surface has been cleaned in this way
is charged again by the charger 20 and starts forming a new image, and at the same time the conductive bristle brush 110 is released from the rubbing state.

On the other hand, the recording paper to which the toner image has been transferred in the transfer section is separated from the circumferential surface of the photoreceptor drum 10 and transferred to the fixing device 16.
0. 163 and 163a are a pair of heat rollers for fixing; 64 is a pair of paper ejection rollers;
The recording paper on which the toner is melted and fixed is discharged from the fixing device by the pair of paper discharge rollers 64.

73 and 74 are paper ejection guides for guiding the recording paper ejected by the paper ejection roller pair 64 to the upper part of the apparatus main body, and the recording paper is guided by the relays of the paper ejection transport roller pair 65, 668 and 67. The sheets are discharged and stacked on the tray 75 with the image surface facing downward.

Next, the configuration of the developing device 600 will be explained.

As described above, the apparatus 600 includes a developing device 611ASM (magenta) that accommodates a Y (yellow) developer, a developing device 611B that accommodates the development side of the developing device (magenta), a developing device 611C that accommodates a C (cyan) developer, and a developing device 611B (BL) that accommodates a C (cyan) developer. It consists of a developing device 611D that contains a developer (black). And the Y
, M, and C each have one cartridge frame 602.
is housed in the guide rail 71 to form a color developing device.
3A and 713B, and is set so as to be removable from an entrance/exit window 713 provided in a frame 701 of a clamshell rotating section 700 formed at the upper part of the base section 800 of the image forming apparatus 1. On the other hand, the bad tax image side storage developing device 611D is located along the guide rail 713C through the entrance/exit window 7.
13, it is set so that it can be attached and detached independently from the other developing devices of the rotating section 700.

Since the configuration of each of the four developing units is the same, the configuration of 611A will be explained. The aforementioned developing roller (developing sleeve) 612 and stirring rollers 614 and 615 are housed inside the container 603 of the developing device, and at both ends of the developing roller 612 there are outer diameter portions 61 that are a certain amount larger than the outer diameter of the roller 612.
3 are provided in the same manner. Further, a gear train 630 for transmitting drive to each of the rollers is provided on the right side of the container 603, and a toner receiving port 621 is provided on the left side of the container 603.
is open.

Then, a spring 618 is applied along a rail 619 provided in the container 603 so as to close the receptacle 0621.
A mouth opening/closing member 618 is provided which is biased by a guide pin 616.

The container is connected to the developing unit 611 by a spring 625 (this may be a plate spring or a helical spring).
A is the outer diameter portion 613 at both ends of the developing roller 612 and the photoreceptor lO
It is designed so that it comes into pressure contact with the surface. This allows the gap between the developing roller 612 and the photoreceptor drum 1O to be maintained at an optimum distance for forming a magnetic brush.

Next, the toner replenishment tank 200 and toner replenishment device 250
I will explain about.

As shown in FIG. 2 and FIG.
, M, C, and BL containers 201A of the same shape.

201B, 201C, and 201D are arranged in one row. Then, the gears 205A, 2 are driven by the drive motor 205.
06, 207, and each of the toner containers 20 through 208A.
The stirring shafts 1A, 201B, 20IC, and 201D and the spiral rotating ring 208 are made rotatable. The spiral rotating shaft 208 is connected to the toner supply port 20 of the tank 200.
9, and the supply conveyance port 209 has 272A, 27
One end of each hose represented by 2B, 272C, and 272D is connected, and a flexible spiral member 2 connected to the spiral rotation shaft 208 is contained in the hose.
71 is provided, and as the spiral rotation shaft 208 rotates, rotation is freely transmitted to the member 271 in the rotational direction of the shaft, and toner is conveyed.

The other end of each hose is connected to an introduction pipe 259 to a distribution container 251 for each color toner of the toner replenishing device 250. A toner supply port 257 is opened in the container 251 . The container 251 is provided with a rail 254 and an opening/closing member 258 that slides on the rail 254. The opening/closing member 258 is opened by a bottle 252 and a spring 255 provided on an extension 251A at the bottom of the container 251. Always biased to the right. The supply port 257 is normally closed and blocked by the port opening/closing member 258.

The bottom extension portion 251A of each distribution container 251 of this toner replenishing device is provided with pins 266, 267 and 264 that fit into elongated holes 708, 709 provided in the frame 701 of the clamshell rotating portion 700. and bending 5 of the plate 261 that is slidable in the direction of the elongated hole.
262 and is fixed.

On the other hand, the frame 701 of the Taramsiel rotation part 700 is connected to the bearing part 802 provided on the frame 801 of the base part 800.
The opening/closing operation is made possible by the rotation support shaft 702 that fits into the opening/closing operation. Note that the rotation support shaft 702 is constituted by a torsion bar, and is always biased in the direction in which the rotation portion 700 is opened. Although not shown, the latch is automatically opened by pressing the opening button and removing the latch, and when the rotating part 700 is manually closed, the latch is automatically engaged and locked in the closed state. It has become.

In addition, pin fitting grooves 703A, 703B, 703C, 70
Camure with 3D < -703 is the bin 704.70 fixed to the frame 701 of the clamshell rotating part 700
5. It is provided so as to fit with the pin 805 fixed to the bottle 266 fixed to the plate 261 and the frame 801 of the base section 800.

When the clamshell pivot 700 is opened from the side view shown in FIG. 1 to the perspective view shown in FIG. 264 moves through the long holes 708 and 709, and the plate 261 with those pins moved to the left.

In this way, the dispensing container 252 of the toner replenishing section, which is fixed to the bent portion 262 of the plate 261 by the bottom extension 252A, can also be moved to the left. As a result, the container 252 is separated from the container 603 of the developing device, and the opening/closing member 258 closes the replenishment hole 257 by the biasing force of the spring 255 to prevent toner from spilling from the distribution container 251. .

On the other hand, the toner receiving port 621 of the container 603 of the developing device 600
The mouth opening/closing member 618 slides on the rail 619 by the biasing force of the spring 617 and is closed. And developing device 6
The toner in the container 603 of 00 is also prevented from spilling.

In this way, when the clamshell rotating section 700 is open, the toner supply section 250 moves backward, closes the toner supply port 257, and closes the toner receiving port 621 of the container 603 of the developing device 600, thereby preventing toner from spilling. Automatically and completely prevented.

When the Taram shell rotating section 700 is open in this manner, the cartridges consisting of the three color developing units of Y, M, and C are combined into one cartridge and integrated as a unit from the entry/exit window 713 of the clam shell to the guide rail. 713
It can be easily attached and detached by being guided by A and 713B.

In addition, the developing device 611D for black toner is also installed independently as one cartridge in the frame 701 of the clamshell rotating section.
It is guided by the guide rail 713C of the entrance/exit window 713 to enable easy attachment and detachment.

,Cleaner 100. Charger 20. Front charge electrode 90.
The photosensitive drum cartridge 500 including the toner collecting section 130 and the like also moves along the guide rail introduction section 712A and the guide rail 712 when the taram shell rotating section is opened as shown in the perspective view of FIG. Guide members 510A and 510B on both sides of the cartridge 500
The drum center pin 11 guides and slides the drum center pin 11 into the guide 7 of the frame on both sides.
It can be set so that it fits in a predetermined position approximately along the line 11.

The opening angle of the rotating part 700 that opens and closes with respect to the base part 800 is approximately 45 degrees. When the rotating part 700 is opened, the guide rail introducing part 712A becomes almost horizontal, and the guide rail 712 is placed at an angle of 45 degrees with respect to the horizontal. In this state, the guide blocks 510A on both sides of the photosensitive drum cartridge 500,
Place the end of 510B near the drum center on the horizontal guide rail introduction part 712A, push it in the horizontal direction, and slide it on the guide rail introduction part 712A until it hits the guide surface on the back side of the guide rail 712, and at that point. Then, by lifting the rear part of the drum cartridge 500 and tilting it by 45 degrees, the guide block 51
0A and 510B fit into the guide rail 712 and slide downward on the 45° inclined surface of the guide rail 712. At the same time, the drum center pins 11 on both sides of the photosensitive drum also move along guides 711 provided on both sides of the frame 701 and are set at a predetermined setting position, completing the mounting.

Next, the fixing cleaning mechanism and its operation in the image forming apparatus of the present invention will be explained with reference to the side sectional view of FIG. 5(a) and the side view of FIG. 5(b). In the figure,
A pair of brackets 520 are installed symmetrically on both sides of the front lower surface of the drum cartridge 500 mounted on the rotation unit 700 of the image forming apparatus 1, and cleaning rollers 550 are attached to both sides of the front lower surface when viewed from the opening side. establish. The brackets 520 are bent integrally at right angles from the lower surface of the drum cartridge 500, and the left and right brackets 520 are provided with elongated holes 520a in the opening/closing direction of the rotating portion 700. On the other hand, the cleaning effective length of the cleaning 550 is a cylindrical roller having approximately the same length in the longitudinal direction as the fixing roller pair 163, 163a, and the surface portion thereof is an elastic roller member 553 having a predetermined thickness. is the roller shaft 522
It is fitted integrally with the. and the roller 553
The surface cleaning portion is subjected to surface treatment necessary for toner transfer. The side plates 5 are located at the center of both sides of the roller shaft 552 of the cleaning roller 550.
Bosses 551 that fit into the long holes 520a of 20 are symmetrically provided to protrude from both side surfaces. The cleaning roller 550 formed in this manner is rotatably fitted into the lower surface of the elongated hole 520a of the side plate 520 by the bosses 551 on both sides. A coil spring 521 is disposed on an elastic member whose one end is fixedly attached to the lower surface of the drum cartridge, and the other end is pressed with a predetermined pressure from above the roller shaft 552 on both sides of the cleaning roller 550. are doing.

Although not shown, bosses are provided at both ends of the roller shaft 552 to fit into the elongated holes 520a, so that bearings are fitted therein to prevent rotation.

The bearing is connected to the long hole 5 along with the roller shaft 552.
20a, and the lower end of the coil spring 521 is fixedly attached to the outer diameter surface of the bearing.

Therefore, when the rotating portion 700 is opened, the base portion 8
Since the boss 551 does not interact with the fixing row 2163 in the fixing device 160 in which the number 00 is disposed, the boss 551 is connected to the elongated hole 5 of the both side plates 520 by the coil spring 521.
It is located at the lower end of 20a. Note that the elastic member 52
1 is illustrated using a coil spring, but a leaf spring may also be used. The rotating section 7 has the drum cartridge 500 attached to the base section 800.
00 is pressed down against the torsion provided on the pivot shaft 702 to close the pivot portion 700, the latch is locked and the image forming apparatus I becomes ready for operation.

and the roller member 55 of the cleaning roller 550 attached to the drum cartridge 500.
3 shows the fixing device 16 disposed on the base section 800.
It is pressed against the surface of the upper fixing roller 163 in 0.

At this time, the boss 5 of the cleaning roller 550
51 slides upward along the long holes 520a of the side plates 520 against the elasticity of the coil springs 521.

Then, when the rotating portion 700 is closed, the cleaning roller 550 is activated by the action of the coil spring 521, which is set to apply a predetermined pressing force to the upper fixing roller 16.
3 and the cleaning roller 550 are pressed against each other. Then, when the main drive switch in the image forming apparatus 1 is turned on, setup of the apparatus 1 is started, and the fixing device 1 is turned on.
The fixing roller pair 163 is heated by a heater built in the fixing roller pair 163.
．． The surface of 163a rises to a predetermined temperature. After a predetermined set-up has passed, the image recording operation is started by turning on a required copy switch.

Then, the recording paper onto which the toner has been transferred by the transfer section in the image forming apparatus 1 is conveyed to the fixing device 160 according to a predetermined sequence, and the pair of fixing rollers 163.1
By holding and rotating the toner 63a, the toner on the surface of the recording paper is fused at a predetermined temperature and conveyed. At this time, since the cleaning roller 550 is in pressure contact with the upper fixing roller 163, it is rotated by the rotational driving force of the fixing roller 163. The toner adhering to the surface of the upper fixing roller 163 when the toner is fused to the recording paper is transferred to the surface of the cleaning roller 550 for cleaning. Note that in the structure of the fixing device 160, the upper fixing roller 16
Since the toner on the recording paper surface is directly fused by the three surfaces, it gets dirty much faster than the lower fixing roller 163a.

However, the lower fixing roller 163a also
The toner adhering to the surface is transferred and becomes dirty, but it is cleaned by the cleaning roller 550 via the upper fixing roller 163, albeit indirectly.

In this way, the pair of fixing rollers 163 and 163a are continuously cleaned by the cleaning roller 550, which rotates in pressure contact with the upper fixing roller 163, so that the surface of the recording paper and the copied image are always kept clean. .

Also, since it is cleaned in this way, the lifespan of the fixing device including the pair of fixing rollers 163 and 163a is 60 degrees.
Can be used up to 00-100.000 prints.

When the cleaning roller 550 reaches a predetermined number of sheets to be fixed, maintenance such as cleaning and replacement is performed together with the photosensitive drum. Since the cleaning roller 550 according to the present invention is disposed in the drum cartridge 500 together with the photoreceptor drum, both can be removed from the rotating part 700 at the same time, so that reliable maintenance can be performed.

Further, in the example described above, a roller member was applied as the fixing cleaning member, but a blade member may be disposed on the drum cartridge 500 side and the upper fixing roller 163
Naturally, means for cleaning by acting on the same are also included within the scope of the present invention.

〔Effect of the invention〕

The fixing cleaning mechanism of the present invention allows the fixing cleaning member to be attached and detached from the image forming apparatus extremely easily. The cleaning member is also automatically removed from the rotating part at the same time as the photoreceptor drum, and since the photoreceptor drum and the cleaning roller have the same lifespan, they can be reliably replaced without erroneously updating each other. Maintenance is now possible.

[Brief explanation of drawings]

FIGS. 1 and 2 are a left side sectional view and a right side sectional view, respectively, of one embodiment of the present invention. FIG. 3 is a top view of one embodiment of the present invention. FIG. 4 is a perspective view of one embodiment of the present invention when the taram shell is opened. FIG. 5(a) is a side sectional view showing a state in which a fixing cleaning roller is disposed in a drum cartridge of a clamshell type electrophotographic image forming apparatus according to the present invention. FIG. 5(b) is a side view of the cleaning roller mechanism. DESCRIPTION OF SYMBOLS 10... Photosensitive drum 11... Drum center pin 20... Charging device 30... Laser writing system unit 160... Fixing device 73... Guide plate 80... Transfer roller 90... Front charger 100...Cleaning device 130...Toner collection section 200...Toner replenishment tank 250...Toner replenishment device 500...Photoconductor drum cartridge 503.50
4... Legs 510A, 510B... Guide member 515... Handle 515A... Back surface 515
B...Finger surface 520...Bracket 521
... Coil spring (elastic member) 550 ... Cleaning roller 551 ... Post 552 ... Roller shaft 5
53...Roller 600...Developer 602
...Cartridge frame 6, lIA...Y developer storage developing device 611B...M developer storage developing device 611C...C developer storage developing device 6110...Bad tax image side storage developing device 700 ... Taramsiel rotation part 701 ... Frame 702 ... Rotation support shaft 71
1... Guide 712. 713A, 713B, 713C... Guide rail 712A... Guide rail introduction part 713... Entry/exit window 800... Base part 802
・・・Bearing part

Claims (1)

[Claims] A clamshell type electrophotographic image forming apparatus having a structure in which a rotating part rotates around a common support shaft with respect to a base part, and is divided into two parts, the base part and the rotating part, to be opened and closed. The rotating section has a fixing cleaning member disposed on the lower surface of the drum cartridge to be mounted, and the fixing cleaning member cleans the inside of the fixing device disposed on the base section when the rotating section is closed. An electrophotographic image forming apparatus characterized in that the image forming apparatus is in pressure contact with a fixing roller surface of the image forming apparatus.