JPH0497173A - Ventilator device for image forming device - Google Patents

Abstract

PURPOSE:To prevent deterioration in precision caused by the thermal expansion of each part of a device by constituting the device with an air purifying means, an insulation wall provided between a heat source and an optical unit, and a ventilating path exhausting the polluted air from the inside to the outside of a frame body whose one part or whole part is the insulation wall. CONSTITUTION:This device is constituted with the air purifying means 11 purifying the polluted air in the frame body and exhausting it outside the frame body, the insulation wall 13 provided between the heat source 9 and the optical unit 3, and the ventilating path 12 exhausting the polluted air from the inside to the outside of the frame body whose one part or whole part serves as the insulation wall 13. Therefore, the polluted air incorporating ozone generated on an electrifier 2 and a transfer unit 5 is led in the direction of the C to an ozone filter 10 through the ventilating path 12. However, at this time, the polluted air takes the heat from the insulation wall 13, and is finally exhausted, so that the heat from a fixing unit 9 is hardly transmitted to an exposing part 3. Thus, the deterioration in the precision of each part caused by the thermal expansion of the part can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a ventilation system for an image forming apparatus such as an electrophotographic copying machine or an electrostatic recording apparatus. (Relating to a ventilation system for an image forming apparatus that radiates heat to the outside of the housing.

(Prior Art) FIG. 3 is a plan view showing the configuration of a ventilation device of a conventional image forming apparatus, and FIG. 4 is a front view thereof. In the figure, reference numeral 1 denotes a photoreceptor drum, which is driven in six directions by arrows by a drive device (not shown). 2 is a charger for uniformly charging the photoreceptor drum 1, and 3 is an optical unit for modulating an image signal into laser light and exposing it to a latent image on the photoreceptor drum 1 after charging. 4 is a developing device for developing the latent image with toner; 5 is a transfer device for transferring the toner image developed by the developing device 4 onto paper 8; and 6 is the toner remaining on the photosensitive drum 1 after the transfer. 7 is a static eliminator for removing static on the photoreceptor drum 1;
1 is a fixing device as a heat source for fixing the transferred toner image onto paper 8 by heat; 10 is an ozone filter for decomposing ozone generated by corona discharge of charger 2 and transfer device 5; 11 is charging Dirty air containing ozone near the container 2 and transfer device 5 is guided to an ozone filter 10,
The fan serves as an air purifying means for discharging this air to the outside of the housing after the ozone is decomposed.

In the ventilation system of the image forming apparatus configured as described above, the ozone generated in the charger 2 and the transfer unit 5 has an adverse effect on the photoreceptor drum 1. The air is introduced into the filter 10, and after ozone decomposition, the air is discharged out of the housing in the direction B of the dotted arrow in FIG.

(Problem to be Solved by the Invention) However, in the configuration of the conventional ventilation device described above, the exposure section 3
fuser 9, even though it requires quite high precision.
As the heat was transferred, the parts expanded thermally, causing the precision of each part to deteriorate significantly.

Therefore, it is an object of the present invention to provide a ventilation system for an image forming apparatus that can solve the above-mentioned problems.

(Means for Solving the Problems) To this end, the present invention provides an air purifying means for purifying contaminated air inside the housing and exhausting it outside the housing, a heat insulating wall provided between the heat source and the optical unit, A ventilation system for an image forming apparatus is constituted by a ventilation path for exhausting dirty air from the inside of the housing to the outside of the housing, which is configured such that a part or all of the housing is the heat insulating wall.

(Function) In the above configuration, since the air in the ventilation path that constitutes the heat insulating wall is discharged to the outside of the housing, the exposure section can be efficiently insulated from the fixing device that is the heat source.

(Example) Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing the ventilation system of the image forming apparatus of the present invention, and 12 is a ventilation path for guiding dirty air containing ozone generated in the charger 2 and the transfer device 5 to the ozone filter 10; Reference numeral 13 denotes a heat source and a heat insulating wall for preventing heat from being transferred from a certain fixing section to the exposure section 3, and a ventilation path 12.
forms part of. The rest is the same as the conventional ventilation apparatus in the image forming state shown in FIGS. 3 and 4, and the same parts are given the same reference numerals and redundant explanation will be omitted.

This device has the above-mentioned configuration, and the dirty air containing ozone generated by the charger 2 and the transfer device 5 passes through the air passage 12 in the direction of the dotted arrow C in FIG.
At that time, the heat from the heat insulating wall 13 is absorbed and the heat from the fixing device 9 is finally discharged.
It is almost never transmitted.

(Effects of the Invention) As explained above, the present invention has an air purifying means for purifying contaminated air inside the housing and exhausting it outside the housing, and a heat insulating wall provided between the heat source and the optical unit. Since the ventilation system of the image forming apparatus is composed of the ventilation path for exhausting dirty air from the inside of the housing to the outside of the housing, which is entirely configured as the insulation wall, the heat from the fixing device is effectively insulated. This makes it possible to reliably prevent thermal expansion of each part of the device.

[Brief explanation of drawings]

Fig. 1 is a plan view of a ventilation system of an image forming apparatus according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a plan view of a ventilation system of a conventional image forming apparatus, and Fig. 4 is its front view. It is a front view. 3...Exposure section 9...Fixing device 11...Fan 12...Air passage 13...Insulating wall

Claims (1)

[Claims] an air purification means for purifying dirty air inside the housing and exhausting it outside the housing; an insulating wall provided between the heat source and the optical unit;
A ventilation system for an image forming apparatus, comprising: a ventilation path for exhausting contaminated air from the inside of the housing to the outside of the housing, the inside of the housing being configured such that a part or all of the housing is the heat insulating wall.