JPS61172168A - Cooling device for copying machine - Google Patents

Abstract

PURPOSE:To prevent contamination in the copying machine inclusive of the optical system, and to prevent excess temperature rise to prevent deterioration in image quality by providing a partition plate inclusive of a filter member and an exhaust fan in the copying machine. CONSTITUTION:A partition plate 50 is provided between the site of the optical system and the site of the lower side of the copying machine inclusive of a photosensitive drum 20, a developing device 22, paper feed cassettes 30A, 30B, a cleaning device 26 and a fixing device 36. A portion of the partition plate 50 has an optical slit 51 as optical path for forming the manuscript image on the photosensitive drum 20. The foremost part of the optical slit 51 adjoining to the drum 20 is fitted with a transparent glass or formed as a narrow slit. A cooling fan 53 is provided to the upper part of the fixing device 36 to the left of the copying machine where the optical system is provided and a fan window 54 covered by a meshed plate is opened in the side wall of the copying machine adjacent to the fan 53. A filter member 52 is provided between the fan 53 and the fixing device 36 in place of the partition plate 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [The invention is directed to a method for blowing heat generated from a source section and a heat fixing device section in an electrostatic recording device such as a transfer-type single-child photocopying machine. This invention relates to an improvement in a cooling device for a copying machine that cools the entire copying machine by cooling the entire copying machine.

[Prior Art] FIG. 1 shows a schematic structure of an electrostatic recording device such as a transfer type electrophotographic copying machine.

At the top of the copying machine main body 1, there are arranged a document tray 2 made of transparent glass on which a document tray is placed, and a document cover 3 that covers the document tray. The copying machine main body 1179 is provided with a first mirror unit 6 equipped with an exposure lamp 4 such as a log lamp and a first mirror 5, which is parallel to the original table 2 and
It is attached to a base so that it can be moved in the horizontal direction of the drawing, and optically scans the entire surface of the document. Second mirror 7 and third mirror 8
The fc second mirror unit 9 moves in the left-right direction so as to maintain a predetermined optical path length, and scans the original.

The reflected light from the original plate is reflected by a first mirror 5, a second mirror 7,
It is reflected by the third mirror 8, further passes through the raw lens 10 and the fourth mirror lt-, and is incident on the photosensitive drum 2° via the slit S.

Since the photoreceptor drum 20 is charged in advance by the imperial electrode 21, electrostatic latent images corresponding to original printing are sequentially formed on the photoreceptor drum 20 according to the original radiation from the optical system. . The electrostatic latent image on the photoreceptor drum 20 is turned into a visible toner image by the developer 22 . Paper feed cassettes 30A, 30B containing a large number of sheets of transfer paper P, and first paper feed rollers 31A, 3 that pull out the transfer paper P one by one from the cassette.
1B, and a second one that feeds the transfer paper P onto the photoreceptor drum 20.
The transfer MP fed from a paper feeding device constituted by a paper feeding roller 32 reaches the photosensitive drum 20 . The toner image on the photosensitive drum 20 is transferred onto the transfer paper P by the action of the transfer electrode. Thereafter, the transfer paper P separated from the photosensitive drum 20 by the separating means has the toner image fixed on the heat roller of the fixing device 36, and is ejected from the copying machine as a permanent image. After the transfer process is completed, the drum 20 is cleaned of residual toner on the drum by the cleaning device 2.6, and is ready for the next copy. The above is the general process for copying.

Heat sources for increasing the temperature inside the copying machine include an illumination light source such as a halogen lamp for illuminating the document, and a heat roller for thermally fixing the toner.

If the temperature inside the copying machine rises above a certain temperature, the recording paper will be subjected to too much drying temperature, causing abnormalities in conveyance, causing paper jams, deterioration of the characteristics of the photoreceptor, or causing problems inside the copying machine. 3J4. Dust including toner powder generated from the image section and the cleaning section rises into the machine due to rising air currents, and is caused by the first mirror 5, second mirror 7, third mirror 8, main lens 10, etc. of the optical system. It adheres to the surfaces of the fourth mirror 11, the document table 2, etc., and obstructs the reflectance, transmittance, etc. of each, making the image gR unclear. In addition, the surface temperature of the exposure lamp 4 such as a halogen lamp for illumination is as high as 250 degrees Celsius, and since the exposure lamp 4 scans the document directly under the document table 2 while irradiating the document, if continuous copying is performed, the document The temperature of the mounting table 2 begins to rise. Therefore, a cooling fan is installed on the document mounting table 2.
It becomes necessary to forcefully cool the rice.

[Problems to be Solved by the Invention] The present invention prevents contamination of the optical system such as mirror lenses of each copying machine due to temperature rise inside the copying machine, and eliminates the need for a forced cooling device for the mm mounting table, using a simple device. An object of the present invention is to provide a cooling device for a copying machine that reduces temperature rise inside the copying machine.

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems. Therefore, a document placing table 2 is placed on the upper surface, and a document plate on the document placing table is placed below the document placing table 2. A partition plate is provided at F9I11 of the projection optical thread part of a copying machine in which a projection source thread for projecting onto the body is arranged, and a part of the partition plate is used as a filter member, and a cooling filter is provided near the optical system. It is characterized by the provision of a fan (achieved by four cooling devices).

[Embodiment] The present invention is designed to isolate the optical system from all other working parts because when the temperature inside the copying machine rises, dust containing toner carried by the rising air contaminates the optical system. This product focuses on preventing contamination.

FIG. 1 shows a complete sectional view of a copying machine according to the invention.

The part where the mirror, lens and the like are mounted, and the main part including the main body, and the photoconductor tram 20 other than the above,
A plate-shaped partition plate 50 is provided between the lower part of the copying machine including the developing device 22, the paper feed cassette 30A, 30B1, the cleaning device 26, and the maintenance device 36. Partition plate 50
A base slit portion 51 is provided in a part of the document gI& for an optical path for tying the document gI& onto the photoreceptor drum 20. of the original slit part 5.1.

The part of the tip near the photoreceptor drum 20 should be covered with transparent glass or should be made into a narrow slit. Cooling is applied to the part above the fixing device 136 on the left side of the copying machine where the above-mentioned main hand system is installed. 753ft fan, 5 fans
3, a fan window 54 covered with a steel plate on the side wall of the copying machine opens as an exhaust window. Fan 53 and fuser [36
In between, a filter member 52 is provided instead of the partition plate 50. That is, the interior of the copying machine is divided into two rooms δ by the partition plate 50 and the filter member 52.

The filter member 52 used in this embodiment is called an electrostatic filter, which collects fine particles in the atmosphere using the electrostatic force of the filter, and is made of synthetic fiber such as polypropylene. It is a filter made by combining fine fibers that are energized with voltage and create positive and negative charges in a single fiber. When air passes through this filter, fine particles of dust and toner powder come into contact with the electrically charged fibers, generating positive or negative static electricity on the particles and toner powder. , Negative grain is layered with rice grains on the glass fibers. The characteristic of this fiber is that it has a very low pressure loss compared to conventional filters, and has a high collection efficiency even when it comes to submicron particles, so there is no need to increase the fan output.

Consider a room partitioned by a partition plate 50 and a filter member 52 in which the upper optical system section of a copying machine is installed. This partitioned room has an exhaust fan 53, which forcibly exhausts hot air at a psm level from the fan window 54 to the outside of the copying machine, so that the temperature rise in the room is small. Also, since the room is partitioned and narrow, cooling efficiency is good. Furthermore, since the air that has passed through the filter member 52 is free of dust and toner powder, it does not contaminate the optical system.

Next, considering the room below the copying machine that is partitioned by the partition plate 50, a heat roll heated by a heating element is housed in this room, and the fan 5 is placed directly above the foot N device 36 in which the heat roll is housed.
3 is located, and the rising hot air is sucked and discharged through the filter member 52t. This filter member 53
Since it is made of a material with low pressure loss, even cooling through the filter member 53 can have a sufficient effect. In addition, a fan 53 is used to clean the fine powder containing toner generated in this room.
When it is sucked in, it passes through the filter member 52, so most of the toner-rich fine powder is crushed by the filter member, and the room where the upper Motoji thread is installed is always clean and clean, and the optical system - ? There is no possibility of contaminating the original stand 2.

[Effect of the invention] According to the invention, by installing a partition plate containing a filter member and one exhaust fan in the copying machine, contamination inside the copying machine including the optical system can be prevented, and A cooling device for a copying machine has been provided which prevents excessive temperature rise, thereby preventing deterioration of image quality and avoiding troubles caused by temperature rise inside the copying machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a copying machine according to the present invention. 4 to 11... Optical system member, 36... Fixing device, 50... Partition plate, 51... Optical slit section, 52...・Filter part, 53
...Fan, 54...Fan window.

Claims (3)

[Claims] (1) A partition plate is installed on the lower side of the projection optical system part of a copying machine that has a document placement table on the top surface and a projection optical system that projects the original on the document placement table onto a photoreceptor below. established,
A cooling device for a copying machine, characterized in that a part of the partition plate is used as a filter member, and a cooling fan is provided near the optical system. (2) A cooling device for a copying machine according to claim 1, wherein the filter member is located above a heat fixing device. (3) The cooling device for a copying machine according to claim 1 or 2, wherein the filter member is an electrostatic filter.