JPH1039696A - Copying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the deterioration of an ozone filter, and prevent the increase of a temperature inside a machine, by installing an ozone adsorbing member on a ventilating path for cooling the inside of the machine, and exhausting the air inside the machine to the outside by a fan. SOLUTION: An ozone filter 14 is located at a home position all the time except for copying time, an elevation motor 21 of the ozone filter 14 is switched on to the ascending side, when a main motor M is switched ON, thereby the ozone filter 14 is ascended to be located on a ventilating path. When the main motor M is switched OFF after the copying operation, the elevation motor 21 is switched on to the descending side, thereby the ozone filter 14 is descended to be returned to the home position. An ozone adsorbing member for adsorbing the ozone generated from a corona discharger, is installed on the ventilating path, so that the exhaust of the ozone to the outside of the machine, can be reduced. Further the ozone adsorbing member is separated from the ventilating path at the time except for the copying time, the cooling efficiency of a fan can be improved, and the deterioration of the ozone adsorbing member can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine using a corona discharge device provided in a machine.

[0002]

2. Description of the Related Art A copying apparatus using a corona discharge device is disclosed in, for example, JP-A-57-1.
As in the image forming apparatus disclosed in Japanese Patent Application Laid-Open No. 7957, there is an image forming apparatus that separates an area around a discharger from other areas and removes and cools ozone in the apparatus by an air flow of a fan. In this type of device, an ozone filter is used to prevent the ozone generated from the corona discharge device from being discharged outside the device.

However, the use of the ozone filter for a long period of time may cause a decrease in the ozone adsorption efficiency of the ozone filter, or the ozone filter may become clogged, thereby lowering the cooling efficiency of a nearby fan and causing an increase in the internal temperature. But,
The proposal for solving this has not been very effective to the knowledge of the present inventors.

[0004] Therefore, the present invention aims at reducing ozone emission outside the machine, suppressing the increase in the machine temperature due to the reduction of the deterioration of the ozone filter and the improvement of the cooling efficiency of the fan, and warning when the machine temperature cannot be suppressed. Alternatively, it is another object of the present invention to provide a copying apparatus which can be set in a copy prohibited state.

[0005]

According to a first aspect of the present invention, there is provided a copying apparatus having a corona discharge device in a machine, which emits light from the corona discharge device in order to achieve the above object. A member for adsorbing ozone, a fan for cooling the inside of the machine and discharging air inside the machine to the outside of the machine, and a temperature detecting means for detecting an inside temperature are provided, and the ozone adsorbing member is arranged on a ventilation path of the fan. It is characterized by the following.

According to a second aspect of the present invention, there is provided a device having means for positioning the ozone adsorbing member on the ventilation path during copying, and keeping the ozone adsorbing member away from the ventilation path except for copying.

According to a third aspect of the present invention, there is provided a control device for driving the fan at a high speed during copying when the temperature detected by the temperature detecting means exceeds a predetermined reference temperature.

According to a fourth aspect of the present invention, when the temperature detected by the temperature detecting means does not become lower than the reference temperature even after a predetermined time has elapsed after driving the fan at a high speed, a warning or a copy prohibited state is set. It is characterized by having means for performing.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a copying apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a reading optical system, 2 denotes a writing optical system, 3 denotes a paper feeding device, and 4 denotes a photosensitive drum.
Around the photosensitive drum 4, a charging charger 5, an eraser 6, a developing unit 7, a transfer / separation charger 8, a cleaning unit 9, and the like are provided. In the figure, reference numeral 10 denotes a fixing device. Above the fixing device 10, a thermistor 12 for detecting an internal temperature near the paper discharge unit 11, an exhaust fan 13 for discharging air inside the device to the outside, and a corona An ozone filter 14 for adsorbing ozone that is generated by the charging charger 5 for performing discharge and the transfer / separation charger 8 and is present in the apparatus is provided. In the figure, M is a main motor.

In this apparatus, the writing optical system 2 forms a latent image on the photosensitive drum 4 based on the image read by the reading optical system 1, and the developing unit 7 applies a toner to the photosensitive drum 4. Make a visual image. On the other hand, the transfer paper supplied from the paper feeding device 3 is carried to the photosensitive drum 4, the toner image is transferred to the transfer paper by the photosensitive drum 4, the image is fixed on the transfer paper by the fixing device 10, and discharged outside the machine. I do.

FIG. 2 is a schematic perspective view showing the vicinity of the paper discharge unit 11, and FIG.
FIG. 4 is a drive control block diagram of the ozone filter 14, FIG. 4 is a control time chart thereof, and FIG. 5 is a flowchart of the operation. As shown in FIG. 3, the main control plate 15 of the device includes:
The fixing heater 1 of the fixing device 10 via the AC drive 16
7, the exposure lamp 18 of the writing optical system 2, the motor 19 for driving the exhaust fan 13, the main switch 20, etc. are connected,
The drive motor 21 for raising and lowering the ozone filter 14, the thermistor 12, the operation unit 22, the upper limit sensor 23 for the position of the ozone filter 14, the home position sensor 24, and various IOs (for clutches, solenoids, sensors, etc.) 25 directly to the main control plate 15. Connect.

As shown in FIG. 2, the ozone filter 14 is at a home position (a position distant from the ventilation path: a position shown by a solid line in FIG. 2) except during copying. And is located on the ventilation path (the position shown by the dotted line in FIG. 2) to adsorb ozone.

That is, when the main switch 20 is turned on (I in FIG. 4), a reload signal is transmitted, and then the print button is pressed (II in FIG. 4: step 1 in FIG. 5), the main motor M is turned on. At the same time, the home position sensor 24 is turned off, the elevating motor 21 of the ozone filter 14 is turned on to the ascending side, and the ozone filter 14 is raised (step 2). Upper limit sensor 2
3 detects that the ozone filter 14 has reached the upper limit position (step 3), turns off the elevating motor 21 (step 4), and positions the ozone filter 14 on the ventilation path (III in FIG. 4). When the main motor M is turned off by the end of the copy (step 5), the upper limit sensor 23 is turned off, and the elevating motor 21 is turned on to the lower side (step 6), and the ozone filter 14 is lowered to return to the home position (FIG. 6). IV, V). When the home position sensor 24 is turned on to detect that the ozone filter 14 has returned to the home position (step 7), the elevating motor 21 is turned off (step 8).

FIG. 6 is a flowchart of the operation control of the exhaust fan 13 by the thermistor 12 for detecting the temperature inside the apparatus. First, the main switch 20 is turned on (FIG. 4
I), a reload signal is sent out, and then when the print button is pressed (II in FIG. 4: step 1 in FIG. 6), the temperature inside the machine is detected and the CP on the main control board 15 inside the machine is detected.
A comparison is made with the reference temperature set to U (step 2), and when the detected temperature T exceeds the reference temperature T1, the exhaust fan 13 is rotated at a high speed only at the time of copying (step 3), and the copying is completed. State judged not to exist (step 4)
Therefore, even if a certain period of time has elapsed, the detected temperature T is equal to the reference temperature T.
If it does not fall below 1 (step 5), the warning display provided on the operation unit 22 is turned on, and the copy is prohibited. If the detected temperature T has fallen below the reference temperature T1 after a certain period of time, the exhaust fan 13 is set to low rotation (step 7).

The rotation speed of the exhaust fan 13 is switched by a relay on an AC drive 16 provided in the machine. FIG. 7 shows a connection diagram of the exhaust fan 13. When switching from low rotation to high rotation, contact A to contact B of the relay
In the case of high to low rotation, the contact is switched from contact B to contact A, respectively.

[0016]

According to the first aspect of the present invention, as described above, the ozone adsorbing member for adsorbing the ozone generated from the corona discharge device is provided on the ventilation path, so that the ozone is discharged outside the machine. This has the effect of reducing noise.

In the copying apparatus according to the present invention, since the ozone adsorbing member is separated from the ventilation path except during copying, in addition to the above-mentioned common effects, the cooling efficiency of the fan is improved and the ozone adsorbing member is deteriorated. Can be reduced.

In the copying apparatus according to the third aspect, the number of revolutions of the fan is switched in accordance with the temperature inside the apparatus. Therefore, in addition to the above-mentioned common effects, the cooling efficiency of the fan can be increased and the temperature rise inside the apparatus can be suppressed.

In the copying apparatus according to the present invention, a warning is issued or the copy is prohibited according to the detection result of the internal temperature after the rotation speed of the fan is increased, so that the cooling efficiency of the fan is improved in addition to the above common effects. The user or the like is notified that the temperature does not rise and the rise in temperature inside the machine cannot be suppressed, so that cleaning and replacement of the ozone filter can be prompted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a copying apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the vicinity of a paper discharge unit of the apparatus of FIG.

FIG. 3 is a drive control block diagram of the ozone filter.

FIG. 4 is a control time chart.

FIG. 5 is a flowchart of the operation.

FIG. 6 is a flowchart of the operation control of the exhaust fan based on the internal temperature.

FIG. 7 is a connection diagram of an exhaust fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reading optical system 2 Writing optical system 3 Paper feeder 4 Photoconductor drum 5 Charger 6 Eraser 7 Developing unit 8 Transfer / separation charger 9 Cleaning unit 10 Fixing device 11 Paper discharge part 12 Thermistor 13 Air discharge fan 14 Ozone filter 15 Main control board 16 AC drive 17 Fixing heater 18 Exposure lamp 19 Motor 20 Main switch 21 Elevation drive motor 22 Operation unit 23 Upper limit sensor 24 Home position sensor 25 Various IOM Main motor

Claims (4)

[Claims] 1. A copying apparatus having a corona discharge device in a machine, a member for adsorbing ozone emitted from the corona discharge device, a fan for cooling the inside of the machine and discharging air inside the machine to the outside, and detecting a temperature inside the machine. Temperature detecting means,
A copying apparatus, wherein the ozone adsorbing member is arranged on a ventilation path of the fan. 2. The copying apparatus according to claim 1, further comprising means for positioning the ozone adsorbing member on the ventilation path during copying and keeping the ozone adsorbing member away from the ventilation path except for copying. 3. A copying apparatus according to claim 1, further comprising means for driving said fan at a high speed during copying when a temperature detected by said temperature detecting means exceeds a predetermined reference temperature. 4. When the fan is driven at a high speed, if the temperature detected by the temperature detecting means does not fall below the reference temperature even after a certain period of time has passed, a warning or a copy prohibiting state is provided. 4. The copying apparatus according to claim 3, wherein: