JPS60197561A - Paper guiding chute - Google Patents

Abstract

PURPOSE:To prevent copied pictures from deteriorating their quality and copying paper from jamming, wrinkling and staining accompanied with copying by exhausting hot air, which is generated from a heat roll of a fixing unit, from an upper duct through numbers of punched holes provided on a chute before hot air comes in contact with an exposing unit. CONSTITUTION:In the way where copying paper is conveyed, numbers of puched holes 8 are provided in a paper guiding chute 7 which is located over units starting from a transfer unit attached to an exposing unit 3, a heat roll 5 of a fixing unit 4 to a pressure roll 6. This enables hot air, which is generated from the heat roll 5 and originally flows toward the exposing unit 3 along the chute 7, is bound to flow routing upward over the chute 7 as shown by the arrow head, and subsequently to flow toward an upper duct 12 through an outlet 10 attached to the upper duct 12, and finally to be exhausted out of the machine 1 through the duct 12 by means of an upper fan 11. Thus, vacuum effect generated prevents copying paer from falling down from the chute 7, accordingly can prevent it completely from jamming, wrinkling and staining accompanied with copying.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper guide chute disposed on the side of a fixing device in an electrophotographic copying machine or the like.

(Prior Art) The paper guide chute in a conventional electrophotographic copying machine is
As shown in FIG.
It is placed between the transfer section of the photoconductor 3 and the heat roll 5 and pressure rule 6 of the fixing device 4 in the conveyance path of paper from the transfer section of the photoconductor 3 to the fixing device 4, and is fed from the paper feed cassette. After a toner image is transferred to the sheet of paper at the transfer portion of the photoreceptor 3, the sheet is guided between the heat roll 5 and the pressure rule 6 of the fixing device 4. However, disposing the paper guide chute 7 between the transfer section of the photoreceptor 3 and the fixing device 4 as in the case of spinning speed,
Hot air generated by the heat roll 5 during fixing is convected along the paper guide chute 7 as shown by the arrow in the figure.
The centrifugal blower 8 placed below the machine body 1 is in contact with the surface of the photoreceptor 30 and is exhausted outside the machine via the ozone filter 9, causing the temperature of the surface of the photoreceptor 3 to rise and the temperature of the photoreceptor to increase. This may seriously affect the image quality of copies, or the air flow in the direction of the heat roll 5 may become strong, causing the paper to fall out of a certain conveyance path, which may cause paper jams. This method has disadvantages in that it causes wrinkles in the paper, smudges in image quality, etc.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the conventional paper guide chute described above, and provides a two-way system between the transfer section of the photoreceptor and the fixing device in an electrophotographic copying machine, etc. The purpose of this paper guide chute is to provide a paper guide chute that prevents deterioration and smearing of copy image quality and paper jams and paper wrinkles within the machine body that occur due to the provision of a paper guide between the pressure rule and the paper guide. .

(Structure of the Invention) For this purpose, the present invention has a plurality of punch holes in the paper guide chute, and the punch holes allow the hot air generated from the heat roll of the fixing device to be directed above the machine body before it comes into contact with the surface of the photoreceptor. from the upper duct to the outside of the machine by an upper fan.

(Embodiments) The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a perspective view showing an embodiment of the paper guide chute of the present invention, and FIG. 3 is a schematic diagram of an electrophotographic copying machine using the same paper guide chute.

In the paper conveyance path from the paper feed cassette attachment part 2 of the machine main body l, through the transfer part of the photoconductor 3, to between the heat roll 5 and pressure rule 6 of the fixing device 4, the heat transfer from the transfer part of the photoconductor 3 to the fixation a4 ) p-ru 5 and pressure roll 6
A plurality of punch holes 8 are formed in the paper guide shade 7 disposed above the paper guide shade 7 between the heat roll 5 and the paper guide shade 7.
The heat flow toward the photoconductor 3 along the arrows in the figure is guided above the paper guide chute 7, and further into the upper duct 1i2. upper duct 1 through intake port 10 provided in
2 and from the upper duct 12 to the upper 77n 11
to exhaust the air outside the machine body 1.

(Effects of the Invention) The present invention is constructed as described above, and the upper part of the main paper conveyance path is arranged between the transfer section of the photoreceptor 3, the heat roller 5 of the fixing device 4, and the pressure roll 6. By punching a plurality of punch holes 8 in the paper guide chute 7 disposed in ... to the upper duct 12 so as not to come into contact with the surface of the photoreceptor 3, which has the effect of making countermeasures against the rise in temperature around the photoreceptor 3 and exhaust heat treatment of the fixing Ja4 extremely easy. In addition, the plurality of punch holes 8 of the paper guide chute 7 allow the paper to pass through the photoreceptor 3.
When the paper is conveyed between the fixing roller 5 and the pressure roll 6 from the transfer section of the fixing roller 5, it exerts a vacuum effect on the paper, so that the paper does not fall off at the paper guide chute 7. Therefore, the occurrence of paper jams, paper wrinkles, copy stains, etc. in the core part can be almost completely prevented.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an electrophotographic copying machine using a conventional paper guide shade, Fig. 2 is a perspective view showing an embodiment of the paper guide chute of the present invention, and Fig. 3 is a guide of the present invention. 1 is a schematic configuration diagram of an electrophotographic copying machine using a chute. , In the figure, 1...Machine body, 2...Paper feed cassette Y attachment part, 3...Photoconductor, 4...Fuser, 5...Heat roll, 6...Pressure roll, 7 ...Paper guide shade 8...Punch hole.

Claims (1)

[Claims] In an electrophotographic copying machine, etc., in the paper transport path from the paper feed cassette installation part in the machine body, through the photoreceptor transfer part, and between the heat roll and pressure roll of the fixing device, the fixing process is performed from the photoreceptor transfer part to the paper transport path between the heat roll and pressure roll of the fixing device. A paper guide chute characterized in that a plurality of punched holes are formed in the guide chute arranged at the upper part of the conveyance path between the heat rule and the pressure roll of the machine.