JPH0326392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an electronic copying machine that has a function of discharging ozone generated from a corotron installed near a cleaner main body.

Generally, an electronic copying machine is provided with a corotron near the photoreceptor for charging or discharging the photoreceptor, and when these corotrons discharge, ozone is generated. This ozone pollutes the environment, so in conventional electronic copying machines, ozone is collected from inside the machine using an ozone exhaust fan, decomposed by an ozone filter, and then discharged outside the machine. High-concentration ozone is difficult to discharge, and this high-concentration ozone deteriorates the photoreceptor. Conventionally, the air volume of the ozone exhaust fan is increased to recover highly concentrated ozone, but as the air volume increases, power consumption and noise increase, and the amount of ozone flowing into the ozone filter per unit volume increases. This caused problems such as a decrease in ozone decomposition efficiency.

This invention was made for the purpose of improving this problem, and the shield of the corotron located near the cleaner body is connected to the housing of the cleaner body, so that the ozone generated by the corotron is removed when the fur brush roll rotates. The present invention provides a cleaning device for an electronic copying machine in which ozone is collected into a cleaner body using an air flow or the like and decomposed by an ozone filter, thereby making it possible to efficiently discharge ozone around a photoreceptor.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
indicates a cleaner body installed near the photoreceptor 1. A pair of fur brush rolls 3 are rotatably provided within the housing 2a of the cleaner body 2 so that the tips of the brush bristles 3a are in sliding contact with the circumferential surface of the photoreceptor 1. Roll housings 2b, 2c are provided on the circumferential surface of these fur brush rolls 3 so as to extend approximately halfway around the fur brush roll 3, and each roll housing 2b, 2c
An electric field curtain sheet 4 for preventing toner from adhering is provided on the inner surface. Further, the residual toner removed from the surface of the photoreceptor 1 by the rotation of each of the fur brush rolls 3 is knocked off into the dust collecting housing 2a by the frit cover 5 provided so as to be in contact with the tips of the brush bristles 3a of each of the fur brush rolls 3. The dust is transported to the screw auger 7 side by the scan vending roll 6 in the dust collection housing 2a, and after being scraped off from the circumferential surface of the scan vending roll 6 by the scraper blade 8, it is carried out by the screw auger 7 to the outside of the dust collection housing 2a. be done.

On the other hand, a charging corotron 9 and a pre-cleaning corotron 10 are installed before and after the cleaner main body 2 (with respect to the rotational direction of the photoreceptor 1). These corotrons 9 and 10 are composed of shields 9a and 10a each having a U-shaped cross section with the opening facing toward the photoreceptor 1, and corona wires 9b and 10b housed within these shields 9a and 10a.
For example, 1 mm between the opening edge of 0a and the surface of photoreceptor 1.
The shields 9a and 9b are placed close to the photoreceptor 1 so that gaps 9c and 10c of approximately 100 mm are formed. Further, among the shields 9a and 10a, the shield 9a of the charging corotron 9 is integrally connected to the roll housing 2b via a bridge portion 2d housing the static eliminating light source 11 on the photoreceptor 1 side, and the shield 9a of the charging corotron 9 is integrally connected to the roll housing 2b. The shield 10a is integrally connected to the roll housing 2c to constitute the whole. Note that 12 in the figure is an ozone filter provided at the upper opening of the dust collection housing 2a.

Therefore, the toner remaining on the surface of the photoreceptor 1 after the transfer process is removed from the fur brush roll 3 of the cleaner body 2.
However, as each fur brush roll 3 rotates, an air flow is generated within the roll housings 2b, 2c in the direction of the scan bending roll 6. This air is supplied to the shields 9a and 1 of each corotron 9 and 10 installed before and after the cleaner body 2.
Gaps 9c and 10c between the edge of the opening of 0a and the surface of the photoreceptor 1
However, the above slits 9c and 10c are inhaled by 1 mm.
These slits 9c, 10c can be
The flow velocity of the air passing through is greater than the corona wind velocity, thereby preventing ozone within the shields 9a, 10a from leaking through the slits 9c, 10c. By the way, corotrons 9 and 1 are installed as shown in FIG. 2 for the photoreceptor 1.
If the direction parallel to the axis of the photoconductor 1 is the X axis, and the circumferential direction of the photoconductor 1 is the Y axis, the wind speed distribution of the corona ion wind emitted from the corotron wire is as shown in Figure 3. The central part is the exhaust, and both ends are the intake. Therefore, if air is not taken in, the gaps 9c, 1 between the photoreceptor 1 and the shields 9a, 10a
At the same time as ozone flows out from 0c, shield 9
Floating toner and the like are sucked in from both ends of the corotron wires 9b and 10a, causing contamination of the corotron wires 9b and 10b. However, in the embodiment of the present invention, if the length of the fur brush roll 3 in the axial direction is, for example, 450 mm, and the interval between the slits 9c and 10c is 1 mm, the slit 9
The flow velocity of the intake air flowing in from c and 10c reaches a nearly uniform rate of about 3.7 m/sec, making it possible to sufficiently prevent ozone from flowing out.

On the other hand, when the air flow containing ozone sucked into the dust collection housing 2a by the fur brush roll 3 passes through the ozone filter 12 on the upper part of the dust collection housing 2a, the ozone is decomposed and only the air is released to the atmosphere. Become.

In the above embodiment, the air flow generated by the rotation of the fur brush roll 3 is used to suck and recover ozone, but it is of course possible to provide a small blower separately to suck the ozone.

As described in detail above, this invention connects the corotron shield and dust collection housing installed near the cleaner body, and allows the ozone generated by the corotron to be introduced into the cleaner body through the gap between the shield and the photoreceptor. By inhaling the ozone and decomposing it using an ozone filter, the high concentration of ozone around the photoreceptor can be removed without using a large airflow blower, reducing power consumption and noise. It becomes like this. Further, since floating toner sucked into the shield does not float around the corotron wire, it is possible to prevent the corotron wire and the inner surface of the shield from becoming contaminated.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view, and FIGS. 2 and 3 are explanatory diagrams showing the state of generation of corona ion wind. 1 is a photoreceptor, 2 is a cleaner body, 2b2c is a housing, 3 is a fur brush roll, 9 and 10 are corotrons, 9a and 10a are shields, 9c and 1
0c is a slit.

Claims (1)

[Claims] 1 A fur brush roll 3 that comes into contact with the surface of the photoconductor 1 and removes untransferred toner remaining on the surface.
A housing 2 of a cleaner body 2 having a
b, 2c, and the shield 9a of the corotron 9, 10 installed near the cleaner main body 2.
The corotrons 9, 10 and the shields 9a, 10a are installed so that the opening edges of the corotrons 9, 10 and the shields 9a, 10a are close to the surface of the photoreceptor 1 through the gaps 9c, 10c, and the rotation of the fur brush roll 3 is By using the airflow generated by the slits 9c, 1
A cleaning device for an electronic copying machine, characterized in that ozone is sucked into the cleaner body 2 from 0c.