JPS6184663A - Image forming device - Google Patents

Abstract

PURPOSE:To make possible cooling by a simple means by sucking air from the outside of an image forming machine by the suction force of a suction device provided to a sheet material conveying part and cooling a heat holding body. CONSTITUTION:A photosensitive drum 1 is uniformly electrostatically charged by a primary charger 2, then an electrostatic latent image is formed by image exposing thereon. Said image is developed to a visible image by a developing device 3 and is transferred onto the paper fed by passing through a paper guide 5. The paper is separated from the drum 1 and rises on a conveying pat 10 where the paper is attracted onto a belt 11 by a conveying fan 12 so as to be fed to a fixing device 13. A conveying fan 15, a chamber 16 to cover the fan 15 and a louver 17 of the cover are provided to the conveying part. The chamber 16 has a wide aperture 19 on the belt 11 side. When the paper is on the belt 11, the paper is attracted to the belt 11 through the aperture 19 of the chamber 16 by which the aperture 19 is covered. Air flow 18 is then created by the fan 15 and the inside of the chamber 16 is evacuated. When there is no paper, the fan 15 sucks the air in the device through both of the aperture 19 and notch 27. The sucked air is discharged to the outside, by which the inside of the device is cooled.

Description

[Detailed description of the invention] The present invention relates to an image forming apparatus including means.

[Conventional technology]

In general, in order to realize the demands for multi-functionality and miniaturization of copying a (hereinafter referred to as PPC), the proportion of electrical components in the entire device increases, and cooling of the electrical components must be taken into consideration, but other Increasingly, it is necessary to place it near a heat source (for example, a joseki). However, it is inconvenient to install a cooling fan for only one electrical component, both in terms of space and cost.

Although there is a method of creating an air flow throughout the inside of the device, it is not preferable because it has side effects such as heated air passing through parts that require cooling and causing toner to be scattered throughout the inside of the device z1.

[Invention 1] The present invention has been made in view of the drawbacks of the conventional examples 1-4,
It is an object of the present invention to provide an image forming apparatus in which a heat retaining body such as an electric component can be cooled by simple punching.

[Means for solving problems]

The image forming apparatus '1 according to the present invention for achieving the object 1-4 includes a suction device provided in a sheet material conveying section, a ly
The image forming apparatus is characterized in that air is sucked from outside the image forming apparatus by a positive attractive force, and the heat retaining body is cooled by the sucked air.

〔Example〕

The present invention will be described below based on an embodiment shown in the drawings.

Zδta is a schematic diagram of an apparatus that is an embodiment of the present invention.

3 is a photoconductor tram, which is rotated in the direction of the arrow by a drive source (not shown). 2 is a primary charger, 3 is an image exposure position, 4 is a developer, 5 is a paper sheet, 6 is a transfer charger, 7 is a separation charger, 8 is a cleaner, 9 is a pre-exposure,
1.0 is a conveyance unit, 11 is a perforated conveyance belt, 12 is a conveyance fan, 13 is a fixing device, and 14 is also a power supply unit. 0 The paper conveyance unit is for transporting paper from one process to the next. Generally, a rotating belt is used. However, when conveying particularly small paper such as B5 size or government-made paper on a belt, the stability of the paper during conveyance is poor.For this reason, a hole is made in the belt and the paper is placed in between. The idea is to install fans at opposite positions to draw a sheet of paper onto the belt.

The operation will be explained below.

First, the photoreceptor drum 1 is uniformly charged by the primary charger 2, then an electrostatic PfI image is formed by image exposure, and then the photoreceptor drum 1 passes through the zero-order one-sheet kite 5, which becomes a visible image by the developing device 3. The image is transferred onto the transferred paper as it passes through the transfer charger 6, and then separated from the drum 1 by the #charger 7.

The zero paper on the conveyance unit 10 is moved by the conveyance fan 12) i
ll-, and is stably sent to the fixing device 13,
The image is fixed on the paper and the copy is completed. Power supply unit 711
4 is placed below the fixing device 13 which is a heat source.

FIG. 2 is an enlarged view of the vicinity of the transport section. 15 is a conveyor fan, 16 is a chamber that covers the fan 15/<-, 17 is a louver (blind-shaped air hole) of the cover, the chamber 16 has a wide opening 19 on the belt 11 side, and extends toward the back of the figure. The sucked air is discharged to the outside of the device through a duct (not shown). Further, there is a notch 27 in the side direction of the power supply device 14 .

As is clear from the above, when a sheet of paper is on the sheet 11 to be conveyed, the sheet passes through the opening 19 of the chamber 16 and is transferred to the belt 11.
attracted to. Therefore, since the opening 19 is covered, the suction opening left in the chamber sucks the air inside the device from both the notch (air hole) 27 and the notch 27, but the air is directly released to the outside of the device. Because it is discharged, it does not cause unnecessary scattering inside υ. During copying, the paper is intermittently present above the transport fan 12, so the arrow 18
Although the airflow shown by is also intermittent, it has been experimentally confirmed that it is sufficient to cool the power supply 14.

No. 314 shows the internal structure of the power supply device 14 for reference, including a cover 14a and an air hole 14b.

It is composed of electrical components such as a 1000 circuit board 14d.

Note that heat retaining bodies include those that generate heat by themselves, such as electrical parts, and those that are heated by other heating bodies.

As described in E below, according to an embodiment of the present invention, suction of paper and cooling of electrical parts can be efficiently performed with one conveyance fan. Furthermore, since the discharge port is exposed to the outside of the device, toner scattering inside the device can be reduced.

〔Effect of the invention〕

As described above, the image forming apparatus according to the present invention uses the suction device provided in the sheet material conveying section to heat the electrical parts etc.
Since it is also used as a body cooling means, the structure is extremely simple.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of an image forming apparatus according to the present invention, Fig. fS2 is an enlarged view of the main part, and Fig. 3 is a power supply
FIG. 11 is a sectional view showing the internal structure of 11'l. 10--one conveyance section, 11--one conveyance belt. 12-m-conveying fan, 13-m constant deposition device, 14
-m-Power supply.

Claims (1)

[Claims] (1) An image forming apparatus characterized in that air is sucked from outside the image forming apparatus by the suction force of a suction device provided in a sheet material conveying section, and a heat retainer is cooled by the sucked air.