JP2003084632A - Image forming device - Google Patents

Image forming device

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Publication number
JP2003084632A
JP2003084632A JP2001280395A JP2001280395A JP2003084632A JP 2003084632 A JP2003084632 A JP 2003084632A JP 2001280395 A JP2001280395 A JP 2001280395A JP 2001280395 A JP2001280395 A JP 2001280395A JP 2003084632 A JP2003084632 A JP 2003084632A
Authority
JP
Japan
Prior art keywords
unit
toner
image forming
forming apparatus
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001280395A
Other languages
Japanese (ja)
Inventor
Makoto Kawamoto
Takashi Yamagata
高史 山形
誠 川本
Original Assignee
Murata Mach Ltd
村田機械株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Mach Ltd, 村田機械株式会社 filed Critical Murata Mach Ltd
Priority to JP2001280395A priority Critical patent/JP2003084632A/en
Publication of JP2003084632A publication Critical patent/JP2003084632A/en
Application status is Pending legal-status Critical

Links

Abstract

(57) Abstract: In an image forming apparatus, in a configuration in which a ventilation fan is forcibly ventilated by an exhaust fan in order to discharge heat from a high-temperature fixing unit or a periphery of a power supply unit to the outside of the apparatus, the developing unit moves from the developing unit to the fixing unit. An air flow is formed, and the floating toner gets on the air and adheres to the lens of the optical writing unit. SUMMARY OF THE INVENTION It is an object of the present invention to prevent such a situation and to form a clear electrostatic latent image on the surface of a photoreceptor drum so as to avoid a decrease in recording image quality of a sheet. SOLUTION: A shielding piece 8a is suspended from an intermediate cover 8,
A rib 37 protrudes from the upper surface of the housing 36 of the photoconductor unit 15 on the apparatus body side. A sponge 38 is provided on the lower surface of the shielding piece 8a.
And the sponge 38 and the rib 37 are arranged to face each other. When the intermediate cover 8 is closed, the sponge 38 is pressed against the rib 37 so that the space around the fixing unit 22 and the space above the photoconductor unit 15 are shut off.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic image forming apparatus.
The present invention relates to an image forming apparatus. 2. Description of the Related Art Generally, an electrophotographic apparatus such as a facsimile machine is used.
In the image forming apparatus of the system, the photosensitive drum is uniformly banded.
Charger for charging, irradiating the surface of the photosensitive drum with light
Writing device for forming an electrostatic latent image, toner on the electrostatic latent image
A developing device for forming a toner image by adhering
And a transfer unit that transfers the toner image formed on the optical body to the paper.
Have. In the developing device, the toner image is
After transfer to the photoconductor, the remaining toner adhering to the photoconductor is
After removing with a cleaning device,
Generally configured as a device that responds to the action
It is a target. On the other hand, the cleaning device is arranged
Without recovering the toner remaining on the photoreceptor to the developing unit,
It is also possible to use a cleanerless mechanism that is used again.
Has been done. The cleanerless image forming apparatus is
Process of creating a toner image and transferring it to paper
The unit is configured as follows, for example. Figure
3, a developing device provided in the process unit 13
The unit 14 is operated in a toner chamber 19 for storing toner.
And a stirrer that stirs the toner
Developing roller 20, and
Supply roller 21 for supplying the toner while charging the toner, and developing
Forming a thin layer of toner adhered to the surface of roller 20
And the blade to be arranged. The supply roller 21 and
Drives in the same direction with the developing roller 20 while being pressed against it
As a result, the toner between the two rollers 20 and 21 is
Is charged by friction, and the toner is
To adhere. Then, it is attached to the surface of the developing roller 20.
The applied toner is pressed by the blade.
The photosensitive drum 1 is formed as a thin layer having a certain thickness.
6 is exposed toward the development position. In combination with the developing unit 14,
In the photosensitive unit 15, the photosensitive drum 16 and the photosensitive drum 16
A band for uniformly charging the optical drum 16
The photosensitive drum 16 has a main body.
Connected to the frame ground and grounded. Also,
Brush below the frame of the photoconductor unit 15
Providing the configured memory removal member, the toner remaining on the photoreceptor
Acts to disturb the toner and weaken the adhesion of the toner.
Let it go. [0005] However, FIG.
As described above, for example, around the photosensitive drum 16,
The toner wound up by the charging roller 18 and the developing unit
The toner or the like that has been weakly transferred from the knit 14
Often floating and floating as a cloud
No. Particularly, a brush roller is used as the charging roller 18.
In this case, the peripheral speed of the brush roller is
Is often set higher than the peripheral speed of
The hoisting and floating of the knuckle are further increased. Also cleaner
In the case of the mechanism, the photosensitive drum 1 is
6. By disturbing the residual toner on
The adhesion to the drum is weakened, and the charging roller 18 is moved
And the amount of floating toner increases. So
Then, such scattered toner is transferred to the photosensitive drum.
16 rides on the airflow affected by the rotation, and the airflow is L
Flowing through the light output section of the ED head array 31, the toner
Is attached to the light output portion. Further, a downstream side of the process unit 13
A fixing unit 22 is provided (on the downstream side in the paper transport direction).
The transferred paper is supplied to the fixing unit 22.
Sent. The fixing unit 22 is a heat source such as a halogen lamp.
A heat roller 23 containing a power source;
And a press roller 24 that is pressed against
The paper is directed to the heat roller 23 by the press roller 24
While pressing, the toner transferred onto the paper is
So that it is fixed by heating and melting
I have. Since the heat roller 23 has a high temperature, the fixing unit
An exhaust fan 48 is provided on the side of the knit 22 and starts here.
The generated heat is forcibly discharged outside the equipment. [0007] Depending on the exhaust fan 48,
Not only the airflow flowing in the axial direction of the
The exhaust fan 48 from each device in the apparatus around the
An airflow is also created that goes to In particular, this latter airflow
Converts the toner floating in the developing unit 14 into an LE.
Leads to the light output section of the D-head array 31, and the photosensitive drum
In addition to the air flow generated by the rotation of the
Toner adheres to the light output section due to the air flow
Problem. Further, as shown in FIGS.
When the air fan 48 is turned, the outside of the housing 36
As a result, a negative pressure is generated, and a slip provided on the upper surface of the housing 36 is formed.
36a and an LED head inserted into the slit 36a.
Floating inside the housing 36 from the gap with the
Toner tends to flow out. Just this floating tona
Light output of the LED head array 31 on the path from which the
Is located, and the photosensitive drum 16 is
LED head array
A 31 is positively charged, so that floating toner is
When approaching the pad 30, the electrostatic force also works, and the toner
This will spur the adhesion of Thus, like the LED head array 31,
In a writing device that performs writing with relatively weak light,
Is attached to the photosensitive drum 16, the writing action
Is not easily performed. And
However, this writing device can be used for special cleaning.
Does not remove dirt during normal image forming operations
It is unthinkable,
If you want to continue the operation of forming an image on
This leads to the problem of reduced image quality. As described above, in the present invention, the photosensitive drum 1
6 or the air flow by the exhaust fan 48
Toner carried by at least one of the streams
Be careful not to adhere to the light detection section of the LED head array 31
The challenge is to do it. [0011] The present invention is to solve the problem.
The problems to be solved are as described above.
The means will be described. That is, as described in claim 1
, A developing unit, a photoreceptor unit, and a fixing unit
Wherein the writing means protrudes into the photoreceptor unit.
In the image forming apparatus, the photoconductor unit and the writer
Airflow blocking means is provided between the mounting board supporting the step and
Prevents airflow from the image unit to the fixing unit
I do. According to a second aspect of the present invention, there is provided a developing unit.
And a photoreceptor unit and a fixing unit.
For an image forming apparatus in which a writing unit is protruded in the optical unit.
In the gap between the photoconductor unit and the writing means.
Airflow blocking means is provided to allow the photoconductor unit
Prevents the generation of air turbulence. More specifically, as described in claim 3,
Item 3. The airflow blocking means according to Item 1 or 2, comprising:
A sealing member made of an elastic body abutting on the piece.
Either the piece or the elastic body is a writing means, or its mounting substrate
And the other is provided on the photoreceptor unit side. Alternatively, as described in claim 4,
Item 1. The photoconductor unit according to item 1 or 2,
Also has a photosensitive drum, and a housing that supports the drum,
The casing has a slit into which a writing unit is inserted.
ing. According to a fifth aspect of the present invention, the developing unit
And a photoreceptor unit and a fixing unit.
For an image forming apparatus in which a writing unit is protruded in the optical unit.
In this case, a sheet-like member is vertically provided around the writing means.
You. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described.
A description will be given with reference to the facsimile machine 1. Less than
In the description, the direction of arrow A shown in FIG.
As the front (front side) of the device 1, the front, rear, left and right positions of each structure
Will be described. FIG. 1 is an overall perspective view of a facsimile machine 1.
As shown in the figure, the main body of the facsimile machine 1
It is placed and fixed on the paper feeder 5, and the image reading
The taking device 3 and the image recording device 4 are arranged vertically. Book
In the embodiment, a laser printer is adopted as the image recording device 4.
The details will be described later. An automatic document feeder is provided above the image reading device 3.
(Hereinafter, “ADF”) 6 is attached to the front of the ADF 6.
On the other hand, the exterior cover 7 is attached to the facsimile machine 1 body.
It is provided to be freely openable and closable. On this exterior cover 7
The surface is used as a document output tray 10 and the output tray 1
A paper feed tray 9 is provided on the top of the paper tray 0. Then,
Documents set on ray 9 are separated one by one and
F6 is taken into the inside, and the image is
It is read by a CD and discharged to the discharge tray 10.
You. The read image is a digital image.
Converted to a signal (image information) and sent to the other party via telephone line
Be trusted. The image information received from the other party is
The paper is processed by the device 4 and is
Will be copied. Alternatively, an image read by the image reading device 3
On the paper by the image recording device 4 without transmission
It can also be transferred (so-called copy function). FIG. 2 shows the external casing of the facsimile machine 1.
This shows a state in which the bar 7 is opened, and as shown in FIG.
Inside, an intermediate cover 8 is provided so that the image recording device 4
She is being dressed. The rotation fulcrum shaft of the exterior cover 7 and the middle
The rotation fulcrum shaft 11 of the intermediate cover 8 is in a direction perpendicular to each other.
The outer cover 32 opens and closes in the left-right direction.
In contrast, the intermediate cover 8 is configured to open and close in the front-rear direction.
Has been established. Therefore, the outer cover 7 and the intermediate cover 8
From the state where both are open,
Is closed, the intermediate cover 8 is pushed
It is not turned around. 3 and 4 are side sectional views of the image recording apparatus 4.
FIGS. 4A and 4B show a state in which the intermediate cover 8 is closed and a state in which
It shows the state that it was. As shown in both figures,
A process unit 13 is disposed below the cover 8.
This process unit 13 is a current unit constituting the image recording unit.
Combining image unit 14 and photoreceptor unit 15
It is configured. The photoreceptor unit 15 contacts the paper and
Photosensitive drum 16 for transferring toner by
A housing 36 for accommodating the drum 16 and a table of the photosensitive drum 16.
And a charging roller 18 for charging the surface to a negative potential.
You. A slit 36 is formed on the upper surface of the housing 36 in the left-right direction.
a is opened, and an optical writing unit to be described later is inserted. The developing unit 14 contains toner.
Supplies toner to the toner chamber 19 and the photosensitive drum 16.
Developing roller 20 and supplying toner to developing roller 20
And a supply roller 21. Then, behind the process unit 13
(A downstream side in the paper feeding direction), a fixing unit 22 is provided.
The fixing unit 22 includes a heat roller 23,
Press roller arranged opposite to the heat roller 23
24. Further, above the photosensitive member unit 15,
The intermediate cover 8 serving as a mounting board has L
The ED head 30 is provided horizontally. The LED head 30
Has a number of light-emitting parts arranged in a line in the width direction of the paper.
LED head array 31 and LED head array
Self-focusing the light from 31 onto the photosensitive drum 16
(Registered trademark) lens 32 and screws from below.
It is screwed by 33. This self
Lens 32 has a short focal length and is in contact with the photosensitive drum 16.
It needs to be placed close. Also, the surface is charged
It is recommended to coat the anti-static agent to prevent the lens from being charged.
No. When the intermediate cover 8 shown in FIG.
The SELFOC lens 32 of the D head 30 is
It is inserted into the slit 36a of the housing 36 of the knit 15 and
Toward the photosensitive drum 16 side, and the LED head
Reference numeral 30 denotes image information (copy) read by the image reading device 3.
-Function) or received image information (file
Based on the facsimile function).
The LED on the array 31 is caused to emit light. Selfockle
Lens 32 displays the image of the light emitting point of the LED on the photosensitive drum 16
And an electrostatic latent image is formed on the photosensitive drum 16.
It is formed. The electrostatic latent on the photosensitive drum 16 is
Attach toner to the image to form a toner image
The paper feeding device 5 feeds the image recording device 4
The toner images are sequentially transferred to paper. This
The sheet on which the toner image has been transferred is sent to the fixing unit 22.
And presses the press roller 24 toward the heat roller 23.
And press the toner transferred on the paper to the heat roller 23.
And heat it to fix it on paper as a permanent image.
You. The paper fixed on the toner is placed under the heat roller 23.
The discharge rollers 25 and 26 arranged on the flow side (rear side)
Thus, the paper is discharged from the image recording device 4. By the way, around the photosensitive drum 16
Is, for example, a toner wound by the charging roller 18.
ー, toner etc. weakly transferred from the developing unit 14
Is an image recording device 4 and an intermediate cover 8 that covers the image recording device 4.
The space that is formed between
I often play. In particular, the charging roller 18
When the lash roller 35 (see FIG. 5) is used, the brush
The peripheral speed of the roller 35 is lower than the peripheral speed of the photosensitive drum 16.
Since the setting is often large, the toner rolls up
And floating more. In the case of a cleanerless mechanism,
The residual toner on the photosensitive drum 16 is disturbed by the removing means.
This reduces the adhesion of residual toner to the drum,
The electric roller 18 easily rolls up more toner.
And the amount of floating toner increases. And such a splatter
Toner is affected by the rotation of the photosensitive drum 16
Riding on the air flow, the air flow
The toner may flow to the LED and adhere to the LED.
You. Further, the toner transferred onto the paper is fixed.
When the heat roller 23 is heated, the temperature of the heat roller 23 becomes high.
An exhaust fan 48 is provided on the side of the knit 22 and starts here.
The generated heat is forcibly discharged outside the equipment. This exhaust fan
The fan 48 flows in the axial direction of the heat roller 22.
Not only the air flow but also the device around the fixing unit 22
The air flow from each device inside to the exhaust fan 48 is also created.
Can be In particular, this latter air flow is
4. The toner floating in 4 is
Led to the LED, and the rotation of the photosensitive drum 16
The wound toner is led out of the housing 36.
Thus, in addition to the air flow due to the rotation of the photosensitive drum 16,
The LED is also triggered by the airflow from the exhaust fan 48.
Will adhere. In addition, from the inside of the housing 36 to the outside
The generation of the air flow toward the part is not necessarily the exhaust fan 48
Regardless of the injuries, the outside
It is also caused by other factors, such as when Further
In addition, the photosensitive drum 16 is negatively charged.
The LED head array 31 arranged in the opposite direction is positively charged,
Therefore, the floating toner approaches the LED head 30.
The electrostatic force also works to accelerate the adhesion of toner to the LED.
It will be over. Thus, like the LED head array 31,
In a writing device that performs writing with relatively weak light,
Is attached to the photosensitive drum 16, the writing action
Is not easily performed. And
However, this writing device can be used for special cleaning.
Does not remove dirt during normal image forming operations
It is unthinkable,
If you want to continue the operation of forming an image on
This leads to the problem of reduced image quality. Therefore, the present invention solves the above problem.
In order to remove the shielding piece 8a and the shielding rib 8b from the intermediate cover 8,
It is installed vertically and covers both front and rear sides of the LED head 30.
At the upper surface of the housing 36 of the photoconductor unit 15 of the image recording unit.
The rib 37 is provided protruding. This shielding piece 8a, shielding rib 8b,
The width of each of the three ribs 37 is the same as that of the LED head 30.
The left side of the intermediate cover 8 is formed to have a length substantially equal to the left and right length.
The shielding piece 8a and the shielding rib 8 are provided over the right width.
The lower end of b is near the upper surface of the housing 36 of the photoconductor unit 15.
Has been extended. Also, an elastic body was provided on the lower surface of the shielding piece 8a.
A sponge 38 is attached, and the sponge 38 is
37. The width of the sponge 38 is also L
The ED head 30 is formed to have a length substantially equal to the left and right length.
Therefore, it is provided horizontally on the lower surface of the shielding piece 8a in the left-right direction. is there
Alternatively, the arrangement of the sponge 38 and the rib 37 is reversed.
Then, the sponge 38 is stuck on the upper surface of the housing 36, and the rib 3
7 may project from the lower surface of the shielding piece 8a. In addition, shielding
A sponge 38 or the like is provided on the lower surface of the piece 8a or the upper surface of the housing 36.
You may attach rubber etc. instead of the foam of
It is not particularly limited as long as it is a body. FIG. 5 shows the photosensitive unit 15 and the LED head.
30 is a side sectional view of FIG. 30, as shown in FIGS. 3 and 5;
When the intermediate cover 8 is closed, the sponge 38
The intermediate cover 8 is pressed against the rib
And the image recording unit (specifically, the intermediate cover 8 and the
Between the fixing unit 22 and the housing 36).
The space and the space above the photoconductor unit 15 are separated and separated.
I can. As a result, the fixing unit is transferred from the developing unit 14.
The airflow toward the knit 22 is cut off, and the photosensitive unit 1
5, the air flow by the exhaust fan 48
The floating toner is not
Adhere to the LED head 30 without flowing in the 30 direction
The amount of toner is reduced. In the above configuration, mainly the exhaust fan 48
Air flow is prevented, but as described above,
Another air flow is also generated by the rotation of the photosensitive drum 16.
You. As shown in FIG.
a which flows out of the housing 36 and floats in the housing 36
May adhere to the LED head array 31. Therefore, as shown in FIG.
30 from the front and back of the LED head array 31.
The sheet members such as the lums 41 are vertically provided. The fill
The width of each of the units 41 is approximately the same as the left and right length of the LED head 30.
The films 41, 41 are formed to have the same length.
Blocks floating toner flowing toward ED head 30
Then, the adhesion to the LED head array 31 is prevented. Ma
At this time, the air flow generated by the rotation of the photosensitive drum 16
Is blocked by the film 41
41 so as to sew between the lower end of 41 and the photosensitive drum 16.
Since the air flows in the circumferential direction of the photosensitive drum 16, the air
The toner flowing along the flow is the LED head array 31
Hardly adheres to In addition, this sheet-shaped member
Is a material that is easily charged to the opposite polarity of the toner, such as
For example, if it is formed of glass, aluminum, iron, etc., it will be more effective
It is necessary to prevent the adhesion of floating toner to the LED head array 31.
Can be. That is, the floating toner is
Before reaching A31, it is adsorbed on the sheet-like member of these materials
As a result, adhesion to the LED head array 31 is prevented beforehand.
Because Alternatively, the sheet-shaped member has a polarity opposite to that of the toner.
Active current, positively charge, toner is easy to adhere
It may be configured as follows. Note that this film 41 is an LED head
The film may be arranged only on the rear side of the ray 31.
41, the photoconductor just below the LED head array 31
Entrained air flow by the drum 16 is no longer generated
Therefore, the toner almost adheres to the LED head array 31.
Absent. As another embodiment, as shown in FIG.
, A film 42 is erected from the front of the LED head 30.
I do. Alternatively, as shown in FIG.
The film 43 is provided vertically from the front surface of the mounting board supporting the
You may. The width of the films 42 and 43 is
Formed at a length substantially equal to the left and right length of the
When the cover 8 is closed, the lower ends of the films 42 and 43
Is in contact with the upper surface of the housing 36 and the upper part of the slit 36a is covered.
The space inside the housing 36 and the space above the housing 36 are separated.
Separated and separated. As a result, the rotation of the photosensitive drum 16
The air flow generated by the rotation does not flow out of the slit 36a.
And along the photosensitive drum 16 substantially in the circumferential direction.
And it will flow. For this reason, it flows on the airflow
The coming toner almost adheres to the LED head array 31.
Absent. FIG. 9 shows another embodiment.
As shown in FIG.
A part 36b is provided, and sponges 39
When the intermediate cover 8 is closed, an elastic body such as
The ED head 30 comes into contact with the sponges 39,
The space inside the body 36 and the space above the housing 36 are separated and separated.
I can. This causes the rotation of the photosensitive drum 16
Does not flow out of the slit 36a,
It flows substantially in the circumferential direction along the photosensitive drum 16
Become like For this reason, the toner that flows on the air flow
Hardly adhere to the LED head array 31. Ah
Or, this sponge 39
When the intermediate cover 8 is closed, it may be attached to the lower surface.
The sponges 39, 39 contact the upper surface of the concave portion 36b of the housing 36.
It is good also as a structure which touches. The recess 36 of the housing 36
b, or a sponge 39.
Rubber etc. may be attached instead of foam such as 39
There is no particular limitation as long as it is an elastic body. As described above, in the embodiment shown in FIGS.
Slide either the front or back of the ED head 30 or the front or back.
Elastic body such as ponge 39 or film 41/42/43
Although airflow blocking means using a sheet-like member is provided,
Then, as shown in FIG. 10 or FIG.
Air flow blocking means may be provided on the side of the zero. As shown in FIG. 12 and FIG.
On the left side of the pad 30, the exhaust fan
48, the LED head array 31
If there is a gap on the side of the slit 36a to be inserted,
The toner floating inside the housing 36 flows out from between
Try to. Tona flew up towards the gap like this
10 is attached to the LED head array 31,
As shown in FIG.
An elastic body such as 45 is attached. This sponge 45
The LED head 30 has a length substantially equal to the front-rear length.
When the intermediate cover 8 is closed, the LED head 30
The lower surface of the housing abuts against the sponges 45,
Is separated and separated from the space above the housing 36.
You. As a result, the space generated by the rotation of the photosensitive drum 16 is reduced.
The air flow stops flowing out of the slit 36a,
The air flows substantially in the circumferential direction along the body drum 16 and the air
The toner transported to the flow is
Almost no adhesion. Alternatively, the sponges 45 are LE
It may be attached to the lower surface of both sides of the D head 30,
When the sponge 45 is closed, the sponge 45
It may be configured to contact the upper surface. Also this sponge
45 is on one side (left side) near the exhaust fan 45
May be provided. The upper surface of the housing 36 or the LED
On the lower surface of the pad 30, a sponge 45
Alternatively, rubber or the like may be attached.
There is no particular limitation. FIG. 11 shows a variation of the sponges 45.
Instead, a sheet-like member is used from the side of the LED head 30.
Films 46, 46 are vertically provided. The film 46.4
6 has a length substantially equal to the front and rear length of the LED head 30
When the intermediate cover 8 is closed, the film 4
The lower end of 6.46 contacts the upper surface of the housing 36 and the slit 3
6a is covered, and the space inside the housing 36 and the space above the housing 36
Is separated from the other space. With this, the photoconductor
The air flow generated by the rotation of the drum 16 is a slit 36a
From flowing out of the photosensitive drum 16 and
Toner that flows in the circumferential direction and is carried by the air flow
Hardly adheres to the LED head array 31.
The film 46 is also provided on the side near the exhaust fan 45.
It may be provided only on one side (left side). The embodiments of the present invention have been described above.
However, for example, the embodiments of FIGS. 5, 7, and 10 are combined.
To the LED head array 31 more effectively
Can be prevented from adhering to the toner. in this way,
Some of the above embodiments may be combined, and the like.
The configuration is not particularly limited. As above
Thus, in the present invention, the toner is
Prevent adhesion and prevent deterioration of image quality recorded on paper.
Can be. The present invention is configured as described above.
It has the effect of. First, as in claim 1,
Developing unit, photoreceptor unit, and fixing unit
And an image type in which writing means is protruded in the photoreceptor unit.
The photoconductor unit and the writing unit.
Providing airflow blocking means between the mounting board to be supported
The toner floating due to leakage from the developing unit
The situation of flowing toward the receiving unit is prevented. Therefore,
Writing means (for example, LED
The amount of toner adhering to the head) is reduced,
Can be prevented. Further, according to the present invention, the developing unit includes:
A photoconductor unit and a fixing unit;
In an image forming apparatus in which writing means protrudes into a knit
Air flow in the gap between the photoconductor unit and the writing means.
With the provision of the blocking means, it is generated by the rotation of the photosensitive drum.
Air flow does not flow from inside the photoconductor unit
At about the tangential direction along the photoreceptor drum.
So that the toner floating on the air flow
Is in the direction of the optical writing means (eg, LED head)
The amount of toner that is prevented from flowing and adheres to the writing unit
Is reduced, and deterioration of image quality can be prevented. And, as in claim 3, claim 1 or
Abuts the airflow blocking means described in 2 on a projecting piece and the projecting piece;
And a projecting piece or bullet.
One of the sexes is provided on the writing means or its mounting board,
By providing the other on the photoreceptor unit side, the elastic body and
With a simple configuration combining the protruding pieces, the developing unit
Between the photoconductor unit and the fixing unit, or inside or outside the photoconductor unit.
The gap is reliably separated, and the toner is
Head). Alternatively, as in claim 4, claim 1,
Or the photosensitive member unit according to (2),
A body drum, and a housing for supporting the drum, wherein the housing
A slit is formed in the body to insert the writing means
By causing the writing means to protrude from the slit into the housing,
The toner is almost attached to the writing means (for example, LED head).
It is possible to adopt a configuration that does not wear. In particular, float above the housing.
Adhesion of idle toner is prevented. According to a fifth aspect of the present invention, the developing unit includes:
A photoconductor unit and a fixing unit;
In an image forming apparatus in which writing means protrudes into a knit
And a sheet-like member is provided around the writing means.
With this, the floating toner flowing toward the optical writing means is blocked.
So that it hardly adheres to the optical writing means.
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing a facsimile machine 1; FIG. 2 is a perspective view of the facsimile apparatus 1 with an outer cover 7 opened. FIG. 3 is a side sectional view of the image recording apparatus 4. FIG. 4 is an image recording apparatus 4 with an intermediate cover 8 opened.
FIG. FIG. 5 is a side sectional view of the photosensitive unit 15 and the LED head 30. FIG. 6 is a side sectional view of the photosensitive unit 15 and the LED head 30. FIG. 7 is a side sectional view of the photosensitive unit 15 and the LED head 30. FIG. 8 is a side sectional view of the photosensitive unit 15 and the LED head 30. 9 is a side sectional view of the housing 36 and the LED head 30. FIG. FIG. 10 is a front sectional view of the housing 36 and the LED head 30. 11 is a front sectional view of the housing 36 and the LED head 30. FIG. FIG. 12 is a side sectional view of the photosensitive unit 15 and the LED head 30. FIG. 13 is a front sectional view of the housing 36 and the LED head 30. DESCRIPTION OF SYMBOLS 1 Facsimile machine 7 Exterior cover 8 Intermediate cover 8a Shielding piece 8b Shielding rib 13 Process unit 15 Photoconductor unit 16 Photoconductor drum 22 Fixing unit 30 LED head 31 LED head array 32 Selfoc lens 36 Housing 36a Slit 37 rib 38 sponge 39 sponge 41 film 42 film 43 film 45 sponge 46 film

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Claims (1)

  1. Claims: 1. An image forming apparatus comprising a developing unit, a photoconductor unit, and a fixing unit, wherein a writing unit is protruded into the photoconductor unit. An image forming apparatus, wherein an airflow blocking unit is provided between the mounting unit and a mounting substrate that supports the unit to prevent generation of an airflow from the developing unit to the fixing unit. 2. An image forming apparatus comprising a developing unit, a photoreceptor unit, and a fixing unit, wherein a writing unit protrudes into the photoreceptor unit, wherein an air current flows through a gap between the photoreceptor unit and the writing unit. An image forming apparatus, comprising a blocking unit to prevent an airflow from the inside of the photoconductor unit to the outside. 3. The airflow blocking means is constituted by a sealing member comprising a projecting piece and an elastic body abutting on the projecting piece, and one of the projecting piece or the elastic body is written by a writing means or a mounting board thereof. The image forming apparatus according to claim 1, wherein the other is provided on the photoconductor unit side. 4. The photoreceptor unit has at least a photoreceptor drum and a housing for supporting the drum, wherein the housing is formed with a slit into which a writing unit is inserted. 3. The image forming apparatus according to claim 1, wherein: 5. An image forming apparatus comprising a developing unit, a photoreceptor unit, and a fixing unit, wherein a writing unit protrudes into the photoreceptor unit, and a sheet member is vertically provided around the writing unit. An image forming apparatus comprising:
JP2001280395A 2001-09-14 2001-09-14 Image forming device Pending JP2003084632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001280395A JP2003084632A (en) 2001-09-14 2001-09-14 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001280395A JP2003084632A (en) 2001-09-14 2001-09-14 Image forming device

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JP2003084632A true JP2003084632A (en) 2003-03-19

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006243442A (en) * 2005-03-04 2006-09-14 Fuji Xerox Co Ltd Image forming apparatus
US7356286B2 (en) 2004-08-10 2008-04-08 Brother Kogyo Kabushiki Kaisha Charger, image forming apparatus and process cartridge
JP2009288597A (en) * 2008-05-30 2009-12-10 Brother Ind Ltd Image forming apparatus and process cartridge
JP2010128053A (en) * 2008-11-26 2010-06-10 Brother Ind Ltd Image forming apparatus and process cartridge
CN101329530B (en) 2007-06-20 2012-07-04 柯尼卡美能达商用科技株式会社 Image forming apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7356286B2 (en) 2004-08-10 2008-04-08 Brother Kogyo Kabushiki Kaisha Charger, image forming apparatus and process cartridge
JP2006243442A (en) * 2005-03-04 2006-09-14 Fuji Xerox Co Ltd Image forming apparatus
JP4572705B2 (en) * 2005-03-04 2010-11-04 富士ゼロックス株式会社 Image forming apparatus
US8285171B2 (en) 2007-06-20 2012-10-09 Konica Minolta Business Technologies, Inc. Image forming apparatus having a dust proofing member for an exposure device
CN101329530B (en) 2007-06-20 2012-07-04 柯尼卡美能达商用科技株式会社 Image forming apparatus
JP2009288597A (en) * 2008-05-30 2009-12-10 Brother Ind Ltd Image forming apparatus and process cartridge
US8175489B2 (en) 2008-05-30 2012-05-08 Brother Kogyo Kabushiki Kaisha Image forming apparatus and process cartridge
US8270867B2 (en) 2008-05-30 2012-09-18 Brother Kogyo Kabushiki Kaisha Image forming apparatus and process cartridge
US8000629B2 (en) 2008-11-26 2011-08-16 Brother Kogyo Kabushiki Kaisha Process cartridge having charger and image forming device provided with the process cartridge
JP2010128053A (en) * 2008-11-26 2010-06-10 Brother Ind Ltd Image forming apparatus and process cartridge

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