JPH0486844A - Image forming device - Google Patents

Abstract

PURPOSE:To improve cooling efficiency by directly blowing off an original platen with outside air by an air blower means provided near the original platen, sucking an air current after cooling the original platen by an exhaust means and forcibly exhausting it to the outside. CONSTITUTION:An inlet port 61 is provided at an upper part on therear side of a device main body 1 and an exhaust port 62 is formed below the port 61. Then, a front frame 63 and a rear frame 64 are disposed in the device main body 1, and a cooling fan 68 and an exhaust fan 66 are attached near the platen glass 3 in the frame 64. A duct 65 constituting an exhaust path 65a and whose cross section is L-shaped is provided along the upper side of the frame 63 and the lower part of an optical system base 70 functioning as an air current guide. In the case of forming an image, the fan 68 is rotated, the outside air is sucked from the inlet port 61 and blows off and cools the glass 3. Then, the fan 66 is rotated, the cooled air current is sucked in the exhaust path 65a and exhausted from the port 62.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an image forming apparatus that is applied, for example, as an electronic copying machine.

(Prior Art) An electronic copying machine is configured as shown in FIG. 6, for example.

When copying with this electronic copying machine, first, a document is set on a document table (hereinafter referred to as platen glass) 103 on the top of the main body 101, and then a copy button (not shown) is turned on.

As a result, the exposure lamp 14 of the first carriage 150
1 is lit and the first and second carriages 150,1
51 moves along the platen glass 103. As a result, the original is scanned with light, and the light reflected via the original is transmitted to the first to third reflecting mirrors 142, 143, 14.
4 to the lens 145, and further passes through this lens 145 to the fourth to sixth reflecting mirrors 14614.
7.148 and is imaged onto the photoreceptor 120 through the slit glass 149. The surface of the photoreceptor 120 is charged by a charging device 121, and an electrostatic latent image of the document is formed by the above-mentioned image formation.

This electrostatic latent image is then transferred to the developing device 123a or 123b.
Developing is carried out by supplying developer.

On the other hand, at this time, the paper feed cassette 110 or 11
A pickup 136 takes out the sheets from the recording medium 1, and a separating and conveying means 137 separates the sheets one by one and sends them to the registration rollers 132. After the paper is aligned by the registration rollers 132, it is sent to the image transfer section 130 between the photoconductor 120 and the transfer charger 125.
The developer image on 20 is transferred. Then, the paper onto which this image has been transferred is processed by the action of the peeling charger 126.
It is peeled off from the photoreceptor 120 and conveyed by a conveyor belt 135. Then, this paper is sent to a fixing device 133, the image is fixed thereon, and the paper is ejected onto the ejection tray 112 via an ejection roller 138. Further, the developer remaining on the photoreceptor 120 is removed and cleaned by the cleaning device 104, and after this cleaning,
The surface of the photoconductor 120 is neutralized by the static eliminating lamp 105 in preparation for the next cycle.

By the way, during this copying, the cooling fan (line flow fan) 1 provided on one side of the apparatus main body 101 is
58 is rotated, and as shown by the arrow, outside air is sucked in from the suction port 101a of the device main body 101, and this outside air is blown along the platen glass 103, and then exhausted to the outside from the exhaust port 101b as shown by the arrow. It is designed to be cooled by

(Problem to be solved by the invention) However, in the past, since the cooling fan 158 was provided below the home position of the carriages 150 and 151, the airflow above the lens cover 161 was sucked toward the cooling fan 158. and platen glass 10
3, there was a problem that the wind could not blow strongly and the cooling efficiency deteriorated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image forming apparatus that can improve cooling efficiency by strongly blowing airflow onto a document table.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention includes an optical system in the main body of the apparatus, and uses this optical system to apply light to the original placed on the original placing table. In an image forming apparatus that forms an image by irradiating light and forming an image on an image carrier with the light reflected through the document, an inlet and an outlet provided in the apparatus main body, and an inlet inside the apparatus main body are provided. an airflow guide provided to face the document placement table at a distance; and an airflow guide provided in the apparatus main body near the document placement table to suck outside air through the suction port and guide the outside air along the airflow guide. Accordingly, the present invention is characterized by comprising: a blowing means for blowing air directly onto the document placing table; and an exhaust means for sucking in the gas blown onto the document placing table by the blowing means and exhausting it to the outside from the discharge port. It is something.

(Function) By blowing outside air directly onto the document table using a blowing means located near the document table, the outside air hits the document table more strongly and improves cooling efficiency. The cooling efficiency is further improved by sucking in the airflow after cooling the document table and forcibly exhausting it to the outside.

(Example) Hereinafter, the present invention will be described with reference to an example shown in the first page to FIG. 4.

FIG. 1 shows the internal structure of an electronic copying machine, and numeral 1 in the figure is the main body of the apparatus. Inside this device body 1, charging, exposure,
Image forming process configuration means 2 such as development, transfer, peeling, cleaning, static neutralization, fixing, etc. are built in, and an original loading table (hereinafter referred to as a platen glass) 3 is provided on the top surface of the apparatus main body 1 on which a document is set. ing.

Further, a paper feed cassette lo, 11 containing paper such as plain paper to be supplied to the image forming process configuration means 2 is inserted into one side of the apparatus main body 1, and the other side of the apparatus main body 1 is inserted. A tray 12 is provided for collecting fixed sheets.

The image forming process configuration means 2 has a configuration as shown in FIG. That is, a drum-shaped photoreceptor 20 as an image carrier is rotatably provided approximately at the center of the apparatus main body l, and around this photoreceptor 20, a charging device 21, an exposure device 21, an exposure device, etc. The exposure section 22a1 of the device (optical system) 22, the developing devices 23a, 23b, the transfer device 25. Peeling device 26. Cleaning device 27. Static eliminators 28 and the like are sequentially arranged.

Furthermore, the paper feed cassette 10 is provided in the apparatus main body 1.
．． The paper automatically fed from 11 or manually fed through the manual paper feed table 29 is transferred to the main body 1 of the apparatus via the image transfer section 30 between the photoreceptor 20 and the transfer device 25. A paper conveyance path 31 leading to the tray 12 provided on the other side is formed.

A pair of registration rollers 32 is arranged on the upstream side of the image transfer section 30 of the paper conveyance path 31, and a fixing device 3 is arranged on the downstream side.
3 and a pair of paper discharge rollers 34 are arranged. Further, a conveyor belt 35 is disposed between the peeling device 26 and the fixing device 33.

Also, in the vicinity of the mounting portion of the paper feed cassette 10.11, there is a pickup roller 36 that takes out sheets one by one, and a pickup roller 36 that receives the sheets taken out via the pickup roller 36 and sends them to the paper conveyance path 31. Separation and conveyance means 37 consisting of a conveyance roller and a separation roller is provided.

Further, the exposure device 22 illuminates the back of the document set on the platen glass 3 provided on the top surface of the main body 1 with an exposure lamp 41 as a light source surrounded by a reflector 40, and emits light reflected from the document. , first reflective mirror 4
2. The light is guided to the lens 45 through the second reflection mirror 43 and the third reflection mirror 44 in order, and then the light transmitted through the lens 45 is guided to the fourth reflection mirror 46 and the fifth reflection mirror 47.
, a sixth reflecting mirror 48, and a slit glass 49, and are guided to the photoreceptor 20 in this order.

The exposure lamp 41 and the first reflection mirror 42 surrounded by the reflector 40 are mounted on a first carriage 50 that is movable back and forth along the lower surface of the platen glass 3.
Further, the second reflecting mirror 43 and the third reflecting mirror 44 are mounted on a second carriage 51 that moves in the same direction at half the speed of the first carriage 50. The carriages 50 and 51 of No. 2 move from left to right in the state shown in FIG. 1 using a carriage shaft or the like as a guide, thereby scanning light onto the original set on the platen glass 3 and onto the photoreceptor 20. The image corresponding to the original is exposed to slit light.

When copying, a document is first set on the platen glass 3, and then a copy button (not shown) is turned on. As a result, the exposure lamp 41 is turned on and the first and second carriages 50, 51 are moved along the platen glass 3. By this movement, light is scanned onto the original, and the light reflected from the original passes through the lens 4 through the first to third reflection mirrors 42, 43, and 44.
5, and further passes through this lens 45 and is imaged onto the photoreceptor 20 via fourth to sixth reflecting mirrors 46, 47, 48 and four slit glasses. Photoreceptor 2
The surface of the document 0 is charged by a charging device 21, and an electrostatic latent image of the document is formed by this imaging. This electrostatic latent image is developed by supplying developer with the developing device 23.

On the other hand, at this time, sheets are taken out from the paper feed cassette 10 or 11 by the pickup 36, separated one by one by the separating and conveying means 37, and sent to the registration rollers 32. After the paper is aligned by registration rollers 32, it is sent to an image transfer section 30 between the photoreceptor 20 and the transfer charger 25, and the developer image on the photoreceptor 20 is transferred. The paper to which this image has been transferred is peeled off from the photoreceptor 20 by the action of a peeling charger 26, and is conveyed by a conveyor belt 35. Then, this paper is sent to a fixing device 33 to have the image fixed thereon, and is ejected to the ejection tray 12 via an ejection roller 38.

By the way, as shown in FIGS. 2 and 3, a suction port 61 is formed in the rear upper part of the apparatus main body 1, and an exhaust port 62 is formed in the lower part of the suction port 61.

Further, a front frame 63 and a catcher frame 64 are disposed within the apparatus main body 1, and a cooling fan (line flow fan) 68 is attached to the rear frame 64 near the platen glass 3. An exhaust fan (line flow fan) 66 is attached to the lower part of the cooling fan 68.

The cooling fan (line flow fan) 68 faces the suction port 61, and the exhaust fan (line flow fan) 66 faces the exhaust port 62.

Further, a duct 65 having a rectangular cross section and forming an exhaust path 65a is provided in the apparatus main body 1 along the upper side of the front frame 63 and the lower side of the optical system base 70 serving as an airflow guide.

On the other hand, as shown in FIG. 4, a fan motor 67 as a drive source is connected to one end of the rotating shaft 68a of the cooling fan (line flow fan) 68, and the cooling fan 68 is rotationally driven by the fan motor 67. It is supposed to be done.

Rotating shaft 6 of the cooling fan (line flow fan) 68
The other end of the exhaust fan 8a is connected to a rotating shaft 66a of the exhaust fan 66 via a pulley 71, a timing belt 72, and a pulley 73.

During image formation, the cooling fan 68 is rotated by the drive of the fan motor 67, and as shown in FIGS. 2 and 3, outside air is sucked in from the suction port 61, and this outside air is directed toward the platen as shown by the arrow. It is blown onto the glass 3 and cools the platen glass 3. This platen glass 3
The outside air blown onto the platen glass 3 flows along the platen glass 3.

Also, at this time, the exhaust fan 66 is rotated via the timing belt 72, and due to this rotation, the airflow that cools the platen glass 3 is directed to the exhaust path 65a as shown by the arrow.
It is sucked into the interior and exhausted to the outside through the exhaust port 62.

As mentioned above, the cooling fan (line flow fan) 6
Since the outside air is directly blown onto the platen glass 3 by the actuator 8, the impact of the outside air on the platen glass 3 can be strengthened, and the cooling efficiency of the platen glass 3 can be improved.

In addition, the warm airflow after cooling the platen glass 3 is forcibly sucked in by the rotation of the exhaust fan 69 and is drawn into the duct 6.
5, the cooling efficiency can be further improved.

Furthermore, since the exhaust fan 66 is rotated by the rotational force of the cooling fan 68 via the timing belt 72, a special drive source for the exhaust fan 66 is not required, and costs can be reduced.

Note that the present invention is not limited to the above embodiment,
As shown in FIG. 5, the rotating shaft 6 of the cooling fan 68
The timing belt 72 connecting the rotating shaft 66a of the exhaust fan 66 and the exhaust fan 66 may be placed on the opposite side from that in the above embodiment.

[Effects of the Invention] As explained above, according to the present invention, since the outside air is blown directly onto the original table by the blowing means located near the original table, the impact of the outside air on the original table can be strengthened. This improves the cooling efficiency of the original table.

Furthermore, since the warm airflow after cooling the document table is forcibly sucked in by the exhaust means and exhausted to the outside, the cooling efficiency can be further improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional front view showing the internal configuration of an electronic copying machine;
Figures 2 and 3 are explanatory diagrams showing the flow of airflow when cooling the platen glass, Figure 4 is a perspective view showing the connection structure between the cooling fan and exhaust fan, and Figure 5 is a diagram showing the connection structure of the cooling fan and exhaust fan. FIG. 6 is a perspective view showing another example of the connection structure, and a schematic configuration diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Apparatus main body, 3... Document mounting table, 20... Photoreceptor (image carrier), 61... Suction port 62... Exhaust port, 66... Exhaust fan (exhaust means) , 68... Cooling fan (air blowing means), 70... Optical system base (airflow guide).

Claims (1)

[Claims] 1. An optical system is provided in the main body of the apparatus, and the optical system irradiates light onto a document placed on a document table, and directs the light reflected through the document onto an image carrier. An image forming apparatus that forms an image by forming an image, comprising: a suction port and a discharge port provided in the device main body; an airflow guide provided in the device main body and spaced apart from and facing the document mounting table; a blowing means provided near the document mounting table, which sucks outside air through the suction port and blows the outside air directly onto the document mounting table by guiding the outside air along the airflow guide; An image forming apparatus comprising: an exhaust means for sucking in gas blown onto the document mounting table and exhausting the gas to the outside from the exhaust port. 2. The image forming apparatus according to claim 1, wherein the blowing means and the exhaust means are connected through a power transmission means, and the blowing means and the exhaust means are driven by a single drive source.