JPS6078466A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent surely dirt of a dustproof member by closing an aperture for exposure of a housing, in which an exposure device is stored, with the transparent dustproof member and providing a ventilating means near the latent image carrier side of the dustproof member. CONSTITUTION:When a cooling fan is operated, the air pressure in the closed housing is raised, and an elastic shield member 22 is opened by this pressure as shown by a chain line in figure, and wind is flowed out from an air hole 21. Flowed-out wind is flowed along the surface of a dustproof glass 11 in the direction of an arrow B and is discharged to the outside of a machine through an air path 18. A toner is flowed by this air to prevent dirt on the surface of the dustproof glass 11. A blast dusct 24 connected to a blast source is provided as the second ventilating means, and wind flowed out from an air hole 25 in the upper part of the casting of an electrostatic charger 15 is flowed to the air path 18 through the charger 15 in the direction of an arrow C to prevent the scattered toner from approaching the dustproof glass 11. Thus, dirt of the dustproof glass is prevented.

Description

Detailed Description of the Invention Technical Field The present invention relates to an exposure device that irradiates a document and exposes a light image of the document onto a latent image carrier, a housing that accommodates the exposure device, and a housing provided in the housing. Open for multiple exposures
The present invention relates to an electronic copying machine having the following features: the opening is closed with a dustproof part made of a transparent material, and the housing is in a sealed state.

PRIOR ART Electronic copying machines of the type described above are well known. In this type of copying machine, the optical path opening of the housing that houses the exposure device is covered with a dustproof member made of a glass plate or the like, so that the latent image carrier, for example, scattered toner from the photoreceptor drum side, fixing silicone gas, etc. It is possible to prevent paper dust from the transfer paper, dust from entering from the outside, etc., from entering. Therefore, it is possible to reliably prevent the optical system members that make up the exposure device from getting dirty.
Extremely advantageous.

However, the above-mentioned toner and the like adhere to the dustproof glass, and this stain causes a problem in that the image quality is significantly degraded. Such a problem has become more noticeable in an electronic copying machine having a photoreceptor drum that rotates at high speed, as the amount of scattered toner increases.

OBJECTS It is an object of the present invention to provide an electronic copying machine that can eliminate the above-mentioned conventional problems and reliably prevent dirt on the dustproof member.

Configuration The configuration of the present invention will be explained below based on the embodiments shown in the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a copying machine main body, and 2 a contact glass provided on the main body. A slit exposure device 3 is provided below the contact glass 2, and the exposure device 3 includes a light source 4 supported by a first traveling body (not shown).
It has a first mirror 5, a second mirror 6 and a third mirror 7 supported by a second traveling body (not shown), an imaging lens 8, and a fourth mirror 9.

The exposure apparatus 3 having the above structure is arranged in a housing 10, and the housing 1o is made of die-cast aluminum, for example. The upper part of the housing 10 is covered with a contact glass 2, and a transparent glass 11 configured as a dust-proof glass is provided at the opening for exposing the latent image carrier configured as a photosensitive drum 14. Several dust-proof members made of anti-corrosive materials are mentioned.

In this way, the inside of the housing 10 is in a sealed state.

Note that reference numeral 12 is a cooling fan for cooling the contact glass 2, which takes outside air into the housing 10 through a filter 13, and directs the outside air to the contact glass. Even if such a fan 12 is provided, the interior of the housing 1 can be kept in a sealed state by providing the filter 13.

Around the photosensitive drum 140, there are provided a charger 15, a non-image eraser 16, a developing device 17, and various means (not shown) for transfer, separation, cleaning, static elimination, etc. The exposure position A of the photosensitive drum 14 by the exposure device 3 is performed between the out-of-image area 16 and the developing device IT. Further, an air passage 18 is formed above the developing device 17, through which air from an air blowing means to be described later passes, and this air passage 18 communicates with the outside of the machine via an ozone filter or the like (not shown). Note that a discharge fan may be provided in the air passage 18 to forcefully discharge the air.

(As previously explained, in the electronic copying machine configured as above, toner etc. adhere to the dust-proof glass 11 and the image quality deteriorates. For this reason, a Teflon brush is installed between the exposure position A and the developing device 17. Although it is attempted to prevent toner from adhering by providing a toner scattering prevention member 19 made of the like, it is not reliable.

Therefore, the electronic copying machine according to the present invention has a ventilation means 2 that can reliably prevent toner etc. from accumulating on the dustproof glass 11.
Next, the ventilation means will be explained in detail.

In FIGS. 1 and 2, the dustproof glass 11 provided in the housing 10 is inclined so that the left end is downward in the figure, and the right side of the dustproof glass 11 is located at an angle of approximately 90° with respect to the glass. A tilted portion 10;1 is formed on the housing 10. A ventilation hole 21 is formed in the inclined portion 10; 1, and the ventilation hole 21 is a long hole having approximately the same length in the longitudinal direction as the dustproof glass 11, or a continuous hole between the above lengths. It consists of multiple small holes. A shield member 22 is provided on the outside of the ventilation hole 21, that is, on the outer surface side of the housing 10, and the ventilation hole 2 is normally closed by the shield part A2. The shield portion 22 is made of a thin plate member having an elastic force such as a thin leaf spring or a polyester film, and one end thereof is fixed with a pin 23. Also,
The other end side of the shield part shrine 22 is leaning towards the free end,
A ventilation means 20 is constituted by the shield member hole 21 and the shield member 22.

The ventilation means 20 configured in this way has the cooling fan 120
The action allows ventilation. That is, cooling fan 1
2 is activated, the air pressure inside the sealed housing 10 increases, and this pressure causes the elastic thin plate shield member 22 to expand as shown by the chain line, opening the ventilation hole 2.
Wind flows out from 1. The flowed wind passes along the surface of the dustproof glass 110 as shown by arrow B, passes through the vicinity thereof, and is discharged to the outside of the machine through the air passage 18. Due to this ventilation, scattered toner, etc. can enter the exposed area, and the dustproof glass 1]
Even if the toner tries to stick to the dustproof glass 1, the toner will be washed away by the ventilation, and the surface of the dustproof glass 1 can be reliably prevented from becoming dirty. Moreover, since the ventilation means 20 skillfully utilizes the cooling fan 12, it can be provided at an extremely low cost.

The electronic copying machine configured as described above also includes a second ventilation means, and the ventilation means will be explained below.

An air duct 24 (not shown) communicating with an air source such as a fan is disposed above the charger 15.
A ventilation hole 25 is formed in the upper part of the casing. The air from this ventilation hole 25 flows through the charger 1 as shown by arrow C.
5 and flows to the ventilation passage 18. In this case, the wind contributes to uniformity of charging, and also serves to keep the scattered toner away from the dust-proof glass 11. Note that if the second ventilation means is a strong wind, the scattered toner will be brought closer to the dustproof glass 11, so it is desirable that the second ventilation means be a weak wind.

FIG. 3 shows a modification of the above embodiment. In this example, the second ventilation means is the developing device 17 of the ventilation duct 24.
Air is blown from a ventilation hole 26 formed in the side wall facing the.

According to this configuration, it is possible to direct the airflow in the second ventilation means to a desired direction.

FIG. 4 shows another embodiment of the present invention, in which the housing 10 is not provided with an inclined portion and the dustproof glass 1 is
It is formed in a planar shape up to the vicinity of 1. A blower duct 27 is disposed on the outer wall of the housing 10 on the right side of the dustproof glass 110 in the drawing. The ventilation duct 27 is formed so that its lower surface is curved, and ventilation holes 28' and 29 are provided near the left end (and in the center) of the curved surface, respectively.

The wind flowing out of the ventilation hole 28 passes near the surface of the dustproof glass 11 as shown by arrow J) and flows into the ventilation path 18.

Further, the wind flowing out from the ventilation hole 29 passes through approximately the center between the dustproof glass 11 and the surface of the photoreceptor drum 140, as shown by arrow 1, and flows into the ventilation path 18. In this embodiment, the blowing means is composed of a blowing duct 27 and a ventilation hole 28 communicating with a blowing source. The second blowing means is composed of a blowing duct 27 and a ventilation hole 29.

In the electronic copying machine having such a configuration, it is easy to control the ventilation time, ventilation amount, etc.

Next, the temporal relationship between ventilation and copying operations of the electronic copying machine according to the present invention will be explained.

Is the ventilation by the ventilation means started at the same time as the copying operation, that is, development, drum rotation, cleaning, etc.?
Alternatively, it is preferable to do this before the copying operation (and it is convenient to finish the ventilation later than the stoppage of the copying operation). .

Next, in the case of continuous copying, as shown in FIG. 5, there is no problem with the ventilation W2 that is ventilated during the copying operation, but the more favorable pressure is the ventilation W1, and the ventilation W1 ensures that the scattered toner is removed. It can be processed.

Effects The electronic copying machine according to the present invention is advantageous in that it is configured as described above and can reliably prevent the image quality from deteriorating due to dirt on the dustproof member.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, FIG. 2 is an enlarged view of its main part, and FIG. 3 is an explanatory diagram showing a modification thereof.
FIG. 4 is an explanatory diagram showing another embodiment of the present invention, and FIG. 5 is a time chart diagram showing the relationship between ventilation and copying operations.・
Dust-proof glass 14... Photoreceptor drum 20... Ventilation means Patent attorney Takeshi Ito gj"' 3 Figure 10 Figure 5 Procedural amendment 1981 11111oO Commissioner of the Japan Patent Office Kazuo Wakasugi 1 case Indication of 1982 Patent Application No. 185129 2 Name of the invention Electronic copying machine 3 Person making the amendment/B Relationship with f'l Patent issue η [1 person lH:'X
'li tree x Masue name (name) (674) Ryo Co., Ltd. 4 agent Showa year month month 1'' Bonfuguchi Showa year month day 6, details of the invention of the specification subject to amendment +! Second Explanation Column 7, Contents of Amendment (1) “Housing 11” stated on page 4, line 15 between specifications
Correct as [Housing 10J. (2) The same book, page 4, line 17 and the same book, page 4, line 20~
"Irene" written in the first line of page 5 is corrected to "erase". (3) "Developing device 15" written in the first line of page 5 of the same book is corrected to "developing device 17." (4) The word ``yō'' written in line 4 on page 8 of the same book is amended to read ``1 action''.

Claims (1)

[Claims] (1) It has an exposure device that irradiates a document and exposes a light image of the document onto a latent image carrier, a housing that houses the exposure device, and an opening for an exposure path provided in the housing. In the electronic copying machine, the opening is closed with a dustproof part made of a transparent material to seal the housing. The above-mentioned electronic copying machine is characterized in that it is provided with a ventilation means capable of performing the following. (2) The ventilation means includes a ventilation means for blowing air into the housing, a ventilation hole provided near the opening of the housing, and an elastic shield member provided so as to close the ventilation hole. 2. The electronic copying machine according to claim 1, wherein one end of the shield member is supported and the other end is a free end.