JPH03145661A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce ozone without especially having a strong odor both dry and wet type developments by mixing and sucking the ozone and the mist of silicone oil which are generated following with destaticizing and electrifying processing and discharging them outside a device. CONSTITUTION:The silicone oil is stable even if its temperature goes up, does not have the off-odor, and moreover, efficiently decomposes the ozone. Then, the mist of the silicone oil is generated by mist generating means 5, 1, and 14, a duct 57 and a fan 61 mix and suck the ozone and the mist which are generated when the destaticizing and electrifying processing of latent image forming means 2 and 3 and a transfer means 10 are carried out and discharge outside the device, so that this mixture permits to decompose the ozone by the mist. In this case, when an image-formation is repeatedly and consecutively carried out from a start for a first prescribed time, the fan is driven for a second prescribed time, and then is driven for a prescribed time whenever a third prescribed time different from the first prescribed time passes. Thus, the discharged ozone concentration is decreased and foul odor is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves charging a charge carrier, exposing the charged surface to recording image light to form an electrostatic latent image, and developing the electrostatic latent image. The present invention relates to a so-called electrophotographic image forming apparatus that transfers images onto a transfer paper and fixes the transfer paper, and particularly relates to reduction of ozone generated in connection with electrostatic latent image formation and transfer.

[Conventional technology]

In image formation by electrophotography, there is a process of uniformly charging a charge carrier, and a developed image (toner image) formed on the charge carrier.
Corona discharge is used in the transfer/separation process in which the transfer paper is transferred to the transfer paper and the transfer paper is separated from the charge carrier, and in the process in which the surface of the charge carrier is neutralized after transfer, and this generates ozone. gives people a unique odor.

Conventionally, in wet-type copying machines, the amount of ozone released outside the machine was small and did not pose a major problem.

The reason why wet-type copying machines emit less ozone to the outside than dry-type copying machines is that the developer mist generated inside the wet-type copying machines catalytically decomposes ozone.

However, in recent years, the increase in ozone concentration due to ozone generation due to discharge cannot be ignored even in wet-type copying machines due to increased speed of copying machines, wide-width copying, static eliminators for the purpose of image stabilization, etc. The developer currently used in wet-type copying machines is generally a toner dispersed in an isoparaffin-based carrier liquid, and has been widely used as a developer due to its excellent physical properties. Also, these solvents can
It has already been confirmed that it is effective in reducing ozone concentration when it comes into contact with ozone.

However, during fixing, these isoparaffin solvents are oxidized by heat and emit a strange odor, so when ozone is mixed with the solvent evaporated in the fixing unit, although the ozone concentration is reduced to some extent, the odor is accompanied by an unpleasant odor, causing discomfort to users. It's possible.

Therefore, in the past, the mist of the solvent evaporated from the fixing process could not be mixed with ozone, and the mist generated around the photoreceptor drum (for example, the mist generated as the cleaning foam roller rotates, the developing It was expected that ozone would naturally come into contact with the mist generated as the roller rotates and the mist generated when the photoreceptor drum and transfer paper are separated after transfer.

[Problem to be solved by the invention 1] However, in dry type copying machines, such ozone reduction can be expected, and in wet type copying machines, it is possible to naturally reduce the contact between ozone and the mist generated around the photoreceptor drum. Leaving it to the outside world is extremely inefficient and has low ozone reduction effects.

The first object of the present invention is to reduce ozone in both dry and wet development without making the odor particularly strong.

[Means for Solving the Problems 1] In order to achieve this first object, the present invention provides a charge carrier (1) and a latent image forming means for forming an electrostatic latent image corresponding to a recorded image on the charge carrier (1). (2, 3), a developing means (5) that develops the electrostatic latent image, a transfer means (10) that transfers the developed image onto transfer paper, and a fixing means (14) that fixes the image on the transfer paper. In an image forming apparatus comprising: a mist generating means (5°1.14) i that generates a mist of a liquid containing silicone oil; and removing and charging the latent image forming means (2, 3) and the transfer means (10). A duct (57) and a fan (6) are used to mix and suck ozone and the mist generated during processing and discharge the mixture to the outside of the device.
1);

Note that symbols in parentheses indicate corresponding elements in the embodiments shown in the drawings and described later.

[Effect 1] Silicone oil is stable against high temperatures and does not produce any strange odor (and is caused by efficient ozone decomposition.) A mist of this silicone oil is generated by a mist generating means (5, 1, 1, 4) occurs, and the duct (57) and fan (61) mix and suck the ozone and the mist generated during the removal and charging process of the latent image forming means (2, 3) and transfer means (]0). Since the mist decomposes ozone through this mixing, the emitted ozone concentration is reduced and the ozone odor is reduced.The mist hardly generates any odor.Therefore, it does not cause discomfort to the user. Never.

[Problem to be solved by the invention 2] By the way, the amount of ozone generated per -times (-sheets) of image formation is small, and when image formation is performed after a relatively long pause time, ozone is generated outside the machine. The amount of ozone emitted is extremely small and does not produce any particularly unpleasant odor. Continuously driving the fan in such a usage mode is a waste of power.

A second object of the present invention is to efficiently remove ozone and prevent substantially unnecessary power consumption.

[Means for Solving the Problem 2] Therefore, in the present invention, when the repetitive image formation continues for a first predetermined period (1 minute) from the start, the fan is turned on for a second predetermined period (5 seconds). After that, a third predetermined period (40 seconds) different from the first predetermined period (1 minute)
The fan control means (30) is provided to drive the fan for a predetermined period (5 seconds) every time lapse of .

[Effect 2] When the repeated image formation continues for the first predetermined period (1 minute),
That is, when the amount of ozone generated and retained becomes relatively large, the fan (61) is driven for a second predetermined period (5 seconds) to promote ozone decomposition and suppress odor. When image formation continues repeatedly on subsequent pages, a third predetermined period (4
The fan (61) is driven for a predetermined period of time (5 seconds) every time (0 seconds) elapses. By appropriately setting the first predetermined time, the second predetermined time, and the drive time of the fan (61) each time, it is possible to efficiently remove ozone, suppress the remaining amount to a predetermined value or less, and reduce the power consumption. Input efficiency can be increased.

When image formation is performed after a relatively long pause time, the amount of ozone discharged to the outside of the machine is extremely small, and at this time the fan (61) is not driven, virtually eliminating unnecessary power consumption. be done.

The present invention described above can be applied to dry-type and wet-type image forming apparatuses to achieve the intended purpose.

By the way, in a wet development image forming apparatus, the carrier liquid of the developer becomes a mist around the developing device (5) and the charge carrier (1), and the carrier liquid becomes a mist from the transfer paper in the fixing device (14), which is converted into ozone. Since it has a decomposition function, in a preferred embodiment of the present invention, the developing means (5) is a wet type developing device (5) that applies a developer in which toner is dispersed in a carrier liquid containing silicone oil to the electrostatic latent image; The mist generating means (5, 1, 14) is the wet developing device (5), the charge carrier (1), and the fixing means (14), and the duct (57) and the fan (61) are used to form a latent image. The removal of the means (2, 3) 7- and the transfer means (10), the ozone generated during the charging process, the area around the charge carrier (1) and the fixing means (
The mist of the carrier liquid of the developing solution generated in step 14) is mixed and suctioned and discharged outside the apparatus.

According to this, in a wet development image forming apparatus, ozone is sufficiently decomposed without adding a separate mist generating means, and the silicone oil of the carrier liquid is stable, so it can withstand high heat during fixing. Even if they meet, it will not be oxidized and will become a highly concentrated mist with virtually no unpleasant odor.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 shows the main parts of an embodiment of the present invention.

The photosensitive drum 1 is continuously driven to rotate at a constant speed in the direction of the arrow during, immediately before, and after copying. After being uniformly charged in the dark by the main charger 2, a light image 3 of the document is irradiated and formed by an exposure device (not shown), thereby forming an electrostatic latent image on the surface of the photoreceptor drum 1. Ru.

8- Next, the portions of this electrostatic latent image outside the image forming area from both sides in the axial direction of the photoreceptor drum are neutralized by the eraser 4. Furthermore, while passing through the developing device 5, this electrostatic latent image is developed with a developer and becomes a toner image. On the other hand, a transfer paper P is fed from a paper feeding device (not shown) via a conveyance guide 7 and a conveyance roller 6 as shown by a broken line P, and
The toner image on the photosensitive drum 1 is transferred onto this transfer paper through the photosensitive drum 6 by the action of a transfer charger 10.

After passing through a nip (not shown), the transfer paper carrying the toner image is conveyed by a conveyor belt 11, and then transferred to a heating roller 12.
In a fixing device 14 in which a pressure roller 13 and a pressure roller 13 are arranged, the toner image is fixed by receiving heat from the heater H of the heating roller 12 when passing through the nip between the two rollers. 27 is a temperature sensor (thermistor) that detects the temperature of the heating roller 12;
20 is a temperature fuse, 20 is a separation claw, and 25 is a silicone coated felt. The pressure roller 13 receives an upward force from the pressure cam 9 which receives the force of the pressure spring 19, and the transfer paper that has been fixed is discharged toward a paper discharge tray (not shown).

On the other hand, residual toner on the surface of the photoreceptor drum 1 after image transfer is removed while passing through a cleaning unit 15, and residual potential on the surface of the drum 1 is removed by a static eliminator 16 using a static eliminator lamp or a static eliminator charger. , ready for the next copy. In the cleaning unit 15,
The surface of the sponge-like foaming roller 23 and one end of the blade 21 are in contact with the surface of the photoreceptor drum 1, and these scrape off the developer remaining on the surface of the photoreceptor drum 1.

Further, a squeezing roller 24 arranged to press the foaming roller 23 squeezes out the developer that has leaked into the foaming roller 23. 22 is a plate that diffuses the cleaning liquid.

In the developing device 5 , a first developing roller 52 . A second developing roller 53 and squeeze rollers (reverse rollers R, R,) 54 are arranged close to and opposite to the photosensitive drum 1. The first developing roller 52 and the second developing roller 52
The developing rollers 53 are each held at a minute distance from the surface of the photoreceptor drum 1, for example, 0.1++a, and are moved in the same direction as the direction of movement of the circumferential surface of the photoreceptor drum 1, as shown by the arrow, at a faster speed. Rotationally driven. Each scraper 55, which is a cleaning member whose one end is fixed to the developing container 51, comes into contact with each developing roller and constantly cleans the toner on the developing roller.

The developer is supplied by a developer supply nozzle 17 that is open above the first developing roller 52 . First, this developer is applied to the first developing roller 52. The second developing roller 53 uniformly conveys the image to the photoreceptor drum l, thereby causing the drum 1
The electrostatic latent image on the surface is developed. The remaining developer on the photosensitive drum 1 is scraped off by a squeeze roller 54 rotating in the opposite direction to the above roller. The surface of the squeeze roller 54 is also cleaned by the scraper 55. The remaining developer used for the development is passed through a recovery pipe 46 through a recovery hole 47 provided at the bottom of the developer container 51 to the developer tank 18.
will be collected.

Next, the developing tank 18 is filled with silicone oil having a siloxane structure that is difficult to evaporate (for example, K, which is methylphenyl silicone manufactured by Shin-11-Etsu Silicone Co., Ltd.).
A developer containing toner and resin dispersed in a carrier liquid containing F-58) is contained.

The motor 42 is a pump motor (Kumadori motor) that also serves as an agitating motor that drives a pump and pumps up the developer K in the developer tank 18 to the developing device 5. The toner concentration is controlled by a toner concentration sensor 49. Further, the liquid level detection float sensor 48 detects the amount of developer in the developer tank 18 .

Note that the same liquid is also supplied to the cleaning unit 15 through a branch path (not shown) upstream of the developer supply nozzle 17 of the developing device 5, and a recovery port (not shown) of the cleaning unit 15 is connected to the recovery pipe via a pipe path (not shown). Since it is connected to the cleaning unit 15,
The same liquid as that supplied to the developing device 5 is supplied and is also returned to the developer tank 18 from which it was supplied.

Further, above the fixing device 14, an exterior duct 57 is provided with a vent near the top surface of the fixing device 14. A filter 58 and a suction fan 59 are attached via an exterior duct 57. The exterior duct 57 absorbs ozone generated by the transfer charger 10 and the static elimination charger 16, which is sucked by the suction fan 59, and the fixing device 14.
Since ozone and solvent mist generated around the photosensitive drum 1 are collected at the same time, the ozone and the solvent mist are mixed in the duct 57 and the filter 58 section.

The mist generated around the photosensitive drum 1 includes the mist generated as the foaming roller 23 rotates, and the mist generated around the roller 5.
There are mist generated as the photosensitive drums 2 to 54 rotate, and further mist generated when the photosensitive drum 1 and the transfer paper are separated after transfer.

The filter 58 increases the contact efficiency between the ozone and the mist collected by the exterior duct 57 and promotes the liquefaction of the collected mist. The carrier liquid liquefied by the filter 58 is returned to the developing tank 18.

The suction fan 59 has a relatively low para
When the fan 61 rotates, it sucks ozone generated in the transfer charger 10 and static elimination charger 16 and solvent mist generated around the fixing device 14 and the photosensitive drum, and further decomposes it in the filter 58. The ozone, that is, oxygen, is discharged from a communication port 60 provided on the side of the device. Furthermore, if the suction fan 59 is too strong, it will waste the heat of fixing, so in consideration of energy saving, the suction force is kept relatively low to the extent that it is in balance with the fixing heat efficiency.

Note that the mist, that is, the carrier liquid that has been cooled and liquefied by the filter 58 is collected into the developing tank 18 through the collection pipe 56 .

By the way, if the suction fan 59 is constantly suctioning, the energization rate will increase, so it is controlled so that it operates only when a large number of copies are to be made in succession. In other words, ozone is sufficiently decomposed by the developer carrier liquid mist generated around the photosensitive drum.
For continuous copying, the concentration is 0.003 ppm or less, so one minute after the start of continuous copying (approximately 40 sheets), the suction fan is activated for 5 seconds (first activation), and the suction fan is activated for the second and subsequent times. The operation interval (interval time from the first operation start time to the second operation start time) is controlled to be shortened to 45 seconds (approximately 30 sheets).

The significance of this operation interval will be explained with reference to the relationship between continuous copy time and ozone concentration shown in FIG.

The horizontal axis of FIG. 8 shows the continuous copying time from the start of copying, and the vertical axis shows the change in ozone concentration corresponding to the continuous copying time. The ozone concentration monotonically increases as the copying time passes (0→d2).

However, when the suction fan 59 is operated at the time (Ll) in which the ozone concentration reaches a set value (d2), the ozone concentration slightly increases (d2→dmax) L/, and after that, the concentration decreases monotonically, and the ozone concentration decreases over time. If the suction fan continues to operate after (Ll), the ozone concentration will converge to a certain concentration (do).

Therefore, by determining the time (Ll) so that the maximum ozone concentration (dmax) reached after the first operation of the suction fan 59 is a sufficiently safe value, the subsequent operation of the suction fan may not necessarily be continuous. There will be no enforcement action. That is, as shown in FIG. 8, the suction fan is operated for a predetermined time (shi0) from time (shi1), and when ozone is sufficiently decomposed (dl), the suction fan is stopped.

Thereafter, after a slight decrease in ozone concentration was observed, the ozone concentration increased again and reached the set value (d2) at a time (t2).
), the suction fan is operated for a predetermined period of time (to), and the same procedure is repeated.

Therefore, even if the ozone concentration is not constantly detected, the time required to reach the preset ozone concentration (d2) is
), it is possible to control the operation of the suction fan. Also, from FIG. 8, (t 1)> (t2t 1)=(ta-t2)=(t
Since there is a relationship as follows, in this embodiment, the time until the first operation of the suction fan 59 is set to 1 minute (= 1), and the time until the first operation of the suction fan 59 is The period was set to 45 seconds ("t2tt").

FIG. 2 shows an electric circuit system, ie, a control section, connected to the mechanism shown in FIG. 1. This control unit includes the CPU 30. ROM3], RAM32 . connected to the address bus, control bus, data bus, etc. Input/output port buffer 33. Input/output capo 16-1-Driver 34 that selectively activates loads such as the drive 9 display in response to signals from the buffer 33, print key, numeric keypad, cassette I-selection key, exposure selection key that starts the copy operation , magnification selection key.

An operation display section 35 that includes a copy number display, a warning display, etc. (not shown), a fixing temperature sensor 27 that detects the fixing temperature of the fixing device 14, and a float that detects the amount of developer in the developer tank. Mechanical white state detection sensors 36 consisting of a sensor 48, etc.; a pulse generator 37 that generates pulses synchronized with the rotation of the photoconductor tram 1; a buffer 38 that inputs an output signal from the operation display section 35 to the CPU 30, etc. has. Control of ozone decomposition, that is, on/off control of the motor 62 of the intake fan 59, is performed by the input/output capo 1.
~ via the driver assigned to the buffer 33 and motor 62.

FIG. 3 shows the control operation (main routine) of the CPU 30 shown in FIG. Power is turned on (Step 1:
(The word step is omitted in parentheses below) and CP
U30 performs initial settings for the copy mode, such as setting the fixing heater and setting the set number of sheets (1 magnification) (2). Thereafter, a copy mode is set (3) in response to the operator's key input, etc., and copy conditions such as warm-up of the fixing heater 27 are checked (4). If the conditions are met, the printer waits for the print key (5).

FIG. 4 shows the contents of the copy mode setting (3) shown in FIG. 3.

Copy mode setting (3) is the number of copies 1-processing (11)
, magnification setting processing (12), cassette selection processing (13)
It consists of a group of subroutines and other subroutines.

Referring again to FIG. 3, in step 5, from the print key wait state, in response to the print key being turned on, the process proceeds to copy start processing (6).

FIG. 5 shows the contents of the copy start process (6). In this process, first, the main motor (the shaft shown in the figure) is turned on and the photosensitive drum 1 is rotated (14).

Next, the pump motor 42 is turned on (15) and the developer K in the developer tank 18 is supplied to the developing device 5 and the cleaning unit 15 (supply is started). Next, motor 4
The timer 1 (program timer) is set to the time required for the developing device 5 to be sufficiently filled with developer after the timer 2 is turned on, and the timer 1 (program timer) is started (16), and then waits for the time to elapse (17). When the time has elapsed, the process proceeds to copy operation processing (7) in FIG.

FIG. 6 shows the contents of the copy operation process (7).

In the copy operation process (7), since the suction fan 59 has not operated for the second time, the 1-minute timer 2 is set to star 1 (22.23). Until the time reaches 1 minute, the suction fan 59 is deactivated, and in the pulse control process (37), the exposure lamp, charger, Performs image formation control such as scanner start, and copy process control including paper feeding, transport, transfer, etc. Next, check whether the set number of sheets has been copied at the timing when the copying operation is completed.38) If not, exit from this routine without turning on the end flag. Return to the copy operation routine again and perform repeat copying. After one minute passes while multiple copies are being made in the same manner (24), the motor 62 of the suction fan 59 for one collection of ozone decomposition is started (24).
8) and start 5 second timer 3 (29.3
0). Furthermore, after 5 seconds have elapsed, the second flag is turned on (32), the suction fan 59 is stopped (33), the timer 2 is turned off (534), and the timer 4 is turned off (35).
remains off) and turns off timer 3 (36).
, the process proceeds to the pulse control process (37) described above. Step 3
If the copying for the set number of sheets is not completed again in step 8, repeat copying is performed and the process returns to step 21. In step 21, since the second flag is turned on (32), the 40 second timer 4 is started (25.26).

In step 27, if the timer 4 has not reached 40 seconds, the process proceeds to pulse control processing (37) and continues copying, -
At the timing when the normal copying operation is completed, check whether the copying for one to several sheets has been completed38).If not, exit from this routine without turning on the end flag and go back to the copying routine. Perform return repeat copy. While making multiple copies in the same way, 40
When seconds have passed (27), the motor 62 of the suction fan 59 for ozone decomposition 2 recovery is started (28) and the 5 second timer 3 is started (29.30). Furthermore,
Wait for 5 seconds to pass (31), then turn on the second flag (32: remains on), stop the suction fan 59 (33), and turn off timer 2 (34).
: remains off), turns off timer 4 (35) and turns off timer 3 (36), and starts pulse control processing (3).
Proceed to 7).

Therefore, when the continuous copy execution time exceeds 1 minute,
The suction fan 59 is activated for 5 seconds, and after 40 seconds have elapsed without copying being completed (40 seconds after the first suction fan operation ended), the second suction fan is activated for 5 seconds. The suction fan is operated for a third time, a fourth time, and so on for 5 seconds every 40 seconds after the suction fan stops operating, unless copying is completed.

After that, the same process is repeated, and when the set number of copies are completed, the copy end flag is turned on (38), and the third
The process advances to the copy post-processing routine (9) shown in the figure.

FIG. 7 shows the contents of the post-copy process (9).

Here, the motor 62 that drives the suction fan 59 is turned off (4), and the pump motor 42 is stopped (42).

Thereafter, the main motor is stopped (44) after waiting for the copy paper inside the machine to be discharged outside the machine (43).

Referring to FIG. 3 again, after completing the post-copy process (9), return to the copy condition setting (3) and proceed as follows: 3 → 4 → 5 → 6
→ 7 → 8 → 9 → 3 → repeat the loop.

To explain the effects of implementing the present invention, the ozone concentration was 0.002 ppm when the open fan 59 was operated for continuous repeat copying of 999 copies for 3 hours under the conditions shown below. Ta.

In addition, as a comparative example, the suction fan 59 was stopped and the
The ozone concentration when continuous and repeated copying of sheets (approx. 1./1.0) is repeated with a 5 minute pause period is
7 ppm, and the effect of using the duct 57 and suction fan 59 was obvious.

(Conditions) Linear speed: 266nwn/see, fixing temperature: 140±l
0°C, measurement environment: 23 ± 2°C - 55 ± 5%, fixed room: 30rn without ventilation, measurement position: 20cm away from the exhaust port, transfer paper: Ricoh'r V P E 6200
Paper (8-4 size), carrier liquid for image liquid: KF-58 (methylphenyl silicone: manufactured by Shin-Etsu Silicon Co., Ltd.).

〔Effect of the invention〕

Silicone oil is stable against high temperatures, does not produce any off-odor, and moreover efficiently decomposes ozone. In the present invention, the mist of silicone oil is generated by the mist generating means (5, 1, 14), and the duct (57)
) and fan (61) mix and suck the ozone and the mist generated during the charging and removing of the latent image forming means (2, 3) and transfer means (10), and discharge the mist to the outside of the apparatus. Since the mistakes 23 24 1~ decompose ozone, the concentration of emitted ozone is reduced and the odor of ozone is reduced. Almost no odor is generated due to mistakes 1~. Therefore, the user does not feel uncomfortable.

Further, in the present invention, the repetitive image formation is performed for a first predetermined period (1
If the ozone generation and retention period continues (5 seconds), the fan (6
1) is activated to promote ozone decomposition and suppress odor. When image formation continues repeatedly on subsequent pages, the fan (61) is further driven for a predetermined time (5 seconds) every time a third predetermined period (40 seconds) elapses.

By appropriately setting the first predetermined time, the second predetermined time, and the drive time of the fan (61) each time, it is possible to efficiently remove ozone, suppress the remaining amount to a predetermined value or less, and reduce the power consumption. Input efficiency can be increased.

When image formation is performed after a relatively long pause time, the amount of ozone discharged to the outside of the machine is extremely small, and at this time the fan (61) is not driven, virtually eliminating unnecessary power consumption. be done.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a mechanism of an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a control section coupled to the mechanism shown in FIG. 1 in one embodiment of the present invention. Figures 3, 4, 5, 6 and 7 are
Flowchart 1 to illustrating the control operation of the CPU 30 shown in the figure.
It is. FIG. 8 is a graph showing the relationship between the continuous copying time and the ozone concentration generated inside the copying machine shown in FIG. 1, and the solid line indicates the ozone concentration when the suction fan 59 is operated intermittently. shows. 1: Photosensitive drum (charge carrier) 2: Main charger 3: Original optical image (2, 3: latent image forming means) 4: Eraser 5
:Developing device (developing means, wet developing means) 6: Conveyance roller 7: Conveyance guide 8: Temperature fuse 9
: Pressure cam 10: Transfer charger (transfer means) 11: Conveyance belt 12: Heat roller 13: Pressure roller ]4: Fixing device (
Fixing means) 15: Cleaning unit 17: Developer supply nozzle 19: Pressure spring 21 Blade 23: Foaming roller 25: Silicone coated felt 27: Temperature sensor 31: RAM 33: Input/output port buffer 35: Operation display section 37: Pulse Oscillator 42: Pump motor 47: Collection hole 49: Toner concentration sensor 52, 53: Developing roller 55: Scraper 58: Filter 60: Ventilation port 62: Motor P: Transfer paper 16: Static eliminator 18: Developing tank 20: Separating claw 22 : Diffusion plate 24 : Squeezing roller 26 : Conveyance guide 30 : CPU (fan control means) 32 : ROM 34 : Driver 36 : Machine white state detection sensors 38 : Buffer 43, 46, 56 : Pipe 48 : Float switch 51 : Developing Container 54 squeeze roller 57: Exterior duct 1- (duct) 59: Suction fan 61: Fan (fan) K: Developer (developer) JP-A-145661 (10) Voice 4 Figure Voice 5

Claims (2)

[Claims] (1) A charge carrier, a latent image forming means for forming an electrostatic latent image corresponding to a recorded image on the charge carrier, a developing means for developing the electrostatic latent image, a transfer means for transferring the image appearing by development onto a transfer paper, and a fixing means for fixing the image on the transfer paper; a mist generating means for generating a mist of a liquid containing silicone oil; generated as a result of removal and charging processing of the latent image forming means and the transfer means; a duct and a fan for mixing and suctioning the ozone and the mist and discharging the mist to the outside of the apparatus; and, when repeated image formation continues for a first predetermined period from the start, the fan is driven for a second predetermined period. An image forming apparatus comprising: a fan control means for driving the fan for a predetermined period every time a third predetermined period different from the first predetermined period elapses thereafter; (2) The developing means is a wet type developing device that applies a developer in which toner is dispersed in a carrier liquid containing silicone oil to the electrostatic latent image; the fixing means; and the duct and the fan remove ozone generated from the latent image forming means and transfer means, charging process, and a developer carrier liquid generated around the charge carrier and in the fixing means. The image forming apparatus according to claim 1, wherein the mist is mixed and suctioned and discharged outside the apparatus.