JPH0538350Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a contact glass cooling mechanism for a copying machine that suppresses the temperature rise of the contact glass due to the heat of the document irradiation lamp.

(Prior Art) The contact glass of a copying machine tends to rise in temperature due to the heat from the document irradiation lamp, and there has been a problem that the contact glass may be damaged if the temperature rises excessively. In order to deal with this, for example, as shown in FIG. 4, which shows a cross section of the copying machine, air flow passages 56 formed by louvers 54 provided at equal intervals on both sides of the rear part of the copying machine 50 are provided for suction. A mechanism was adopted in which air was introduced from outside the machine body through the airflow path 56 by the operation of the fan 52, the air was directed against the back surface of the contact glass 58, and then discharged outside the machine.

(Problem to be solved by the invention) However, in the above mechanism, the air flow passage 5 is disposed at a position away from the suction fan 52.
The amount of air flowing in from 6 is reduced. Therefore, the temperature of the area B of the contact glass 58 at a position far from the suction fan 52 becomes extremely high compared to the temperature of the area A at a position close to the suction fan 52.
This has the disadvantage of causing damage to the contact glass.

(Purpose of the invention) The purpose of this invention was made in view of the above-mentioned problems, and it is an object of the invention to provide a cooling mechanism that uniformly cools the entire surface of the contact glass.

(Means for solving the problem) In order to achieve the above object, the contact glass cooling mechanism of the copying machine of this invention includes a suction fan,
It has a louver and an air flow passage that is defined by the louver and takes in air to cool the back side of the contact glass, and the amount of air flowing from the air flow passage on the front side of the fuselage toward the front side of the contact glass is , the amount of air flowing from the air flow path on the rear side of the fuselage toward the rear side of the contact glass is larger than the amount of air flowing into the rear side of the contact glass.

(Function) The amount of air that is drawn in by the suction fan from the airflow path defined by the louvers and then moves across the back surface of the contact glass increases from the rear to the front of the fuselage.

(Example) The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the copying machine, and the interior of the housing 1 is divided into an upper space 7 and a lower space 9 by a partition plate 3 and a transparent plate 5 located at a position through which a light image passes. Both spaces are partitioned by a partition plate 3 and a transparent plate 5 so that floating toner from the toner image forming means arranged in the lower space 9 does not flow into the upper space where the optical means is arranged. Reference numeral 11 denotes a contact glass on whose upper surface an original to be copied is placed, and an optical system having an original irradiation lamp 13 is moved on its lower surface. The contact glass 11 is heated by the heat emitted from the original irradiation lamp 13 when the original irradiation lamp 13 is turned on. The contact glass 11 that is heated in this way needs to be cooled, and a cooling fan 15 for this purpose is provided at the rear of the housing 1. In addition, louvers 17 for guiding air into the housing 1 are provided on the left and right sides of the housing. provided.

FIG. 2 is a cutaway view of the main parts of the copying machine seen from above. A suction fan is provided at the rear of the housing 1, and a large number of louvers 17 are provided in each of the openings 16 on both sides of the housing 1. A plurality of airflow passages 19 are defined by the louvers 17. The inclination angle of the louver 17 toward the front side increases as it goes from the front side to the rear side of the housing 1 toward the back side so as to send more air toward the front side of the housing 1. With this configuration, the portion 11a of the contact glass located far from the suction fan 15 receives the air sent from the rear side of the housing to the front side, and the air sent from the air flow passage 19 on the front side of the housing 1 in the left-right direction. It is cooled by air. Also, the contact glass portion 11b located near the suction fan 15
is effectively cooled by the air that has cooled the contact glass portion 11a located on the front side of the housing.

FIG. 3 shows another embodiment in which the shape of the louver and the shape of the air flow passage are different, in which the louver 20 extends linearly in the left-right direction of the housing 1, and the air flow passage 22 formed by the louver 20 is The opening width becomes gradually wider toward the front side of the housing 1. In this configuration, the amount of air for cooling the portion 11a of the contact glass located far from the suction fan 15 is increased.
Further, the portion 11b of the contact glass located close to the suction fan 15 is effectively cooled by the air that has cooled the portion 11a of the contact glass located far from the suction fan 15.

(Effects of the invention) The entire surface of the contact glass can be cooled uniformly with a simple configuration of changing the shape of the louver and the shape of the air flow path defined by the louver.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a copying machine, FIG. 2 is a cutaway view of essential parts of the copying machine, FIG. 3 is a diagram showing another embodiment, and FIG. 4 is a diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Housing, 11... Contact glass, 17, 20... Louver, 19, 22... Air flow path.

Claims (1)

[Claims for Utility Model Registration] (1) It has a suction fan, a louver, and an air flow path defined by the louver and which takes in air to cool the back side of the contact glass. The structure is designed so that the amount of air flowing from the flow path toward the front side of the contact glass is larger than the amount of air flowing from the air flow path at the rear of the fuselage toward the rear side of the contact glass. The contact glass cooling mechanism of copiers features a unique feature. (2) A utility model registration claim characterized in that the air flow passage formed by the louver is formed such that the angle of inclination toward the front side of the fuselage increases as it goes from the front side to the rear side of the fuselage body. A contact glass cooling mechanism for a copying machine according to scope 1. (3) Utility model registration claim 1, characterized in that the air flow passages formed by the louvers are formed such that the distance between adjacent ones increases from the rear side to the front side of the fuselage body. Contact glass cooling mechanism as described.