JPH0436777A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the heat of power source part from diffusing in a machine by performing the suction of a carrying belt from a transfer part to a fixing part and the cooling of the power source part by means of a common fan. CONSTITUTION:In this image forming device, the recording paper is carried while it is sucked to the surface of the carrying belt 23 by utilizing the suction of a sirocco fan 27, and the suction is performed by sucking air into air intake boxes 30a and 30b from parallel gaps of narrow belts. Then, the exhaust pipe 31 of the fan 27 surrounds a power source case in which the power source part of the image forming device is housed and is coupled with an extension duct 32 which is connected to an exhaust grill part provided on an external wall. Therefore, the power source part is cooled by the sucked air of the belt 23 and the heat of the power source part is prevented from diffusing in the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image forming apparatus in which a power supply unit is cooled by air blowing, and particularly to an image forming apparatus in which a toner image is transferred and separated from an image forming body to a transfer sheet. The present invention relates to an image forming apparatus that is attracted to a conveyor belt by suction and conveyed to a fixing device.

[Conventional technology]

Conventional image forming apparatuses that use air to cool the power supply unit diffuse the heat from the power supply unit into the machine, while those that do not do so require a separate fan to cool other parts, increasing costs and costs. This increased power consumption. Even in the case where a suction conveyor belt is used to convey the transfer paper from the transfer section to the fixing section, separate fans are used for cooling the power supply section and suctioning the conveyor belt.

Furthermore, as disclosed in Japanese Utility Model Application Laid-open No. 1-105942, there is also known a fan that uses one fan to switch between the exhaust flow path from the optical system and the exhaust flow path from the developing/fixing system.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that uses a common fan for cooling the power supply section and for suctioning the conveyor belt, thereby preventing heat from the power supply section from being diffused into the machine.

[Means to solve the problem]

The present invention provides an image forming apparatus in which a transfer sheet, on which a toner image has been transferred and separated from an image forming body, is adsorbed onto a conveyor belt by suction and conveyed to a fixing device. The image forming apparatus is characterized in that a power supply section of the image forming apparatus is provided in the image forming apparatus, and with this configuration, the above object is achieved.

[Function] In other words, since the image forming apparatus of the present invention has the power supply section in the duct that guides the exhaust air of the transfer belt to the fixing section to the outside of the machine, the power supply section is powered by the transfer fan. It is also cooled, so the heat from the power supply section does not spread into the cabin.

〔Example〕

The present invention will be explained below using illustrated examples.

FIG. 1 is a schematic sectional view showing an example of the image forming apparatus of the present invention, and FIG. 2 is a plan view of the main parts.

The image forming apparatus shown in FIG. 1 includes a document reading section A and an image forming and recording section B. The image forming apparatus shown in FIG. In the document reading section A, a document is placed on a document table L, and the light reflected from the document is incident on a color separation imaging system 5 using a scanning exposure system consisting of an exposure lamp 2, a mirror 3, and a mirror 4, and color separation is performed. The imaging system 5 enters the image sensor 6 for each color, and the image sensor 6 outputs image signals for each color. Further, the image forming and recording unit B performs image forming and recording as follows.

As the photosensitive drum 7 rotates in the direction of the arrow, a pre-cleaning static eliminator 8 consisting of an exposure lamp and a corona discharger removes static electricity from its surface, and a cleaning device 9 cleans the static neutralized surface. A charger 10 uniformly charges the surface. A laser beam modulated based on, for example, an image signal for blue from the image sensor 6 of the document reading section A is applied to the charged surface by a laser beam scanner 11 such as a polygon mirror.
or a mirror, etc., and an electrostatic image is formed.

A developing device 12 develops the electrostatic image into a yellow toner image using a non-contact jumping developing method. The toner image forming surface passes through the other developing devices 13 to 15, the transfer device 16, the separator 17, the pre-cleaning static eliminator 8, and the cleaning device 9, which are placed in an inactive state, and reaches the charger lO. Once this is reached, the charger 10 uniformly charges the toner image forming surface again. A laser beam modulated based on an image signal for green, for example, is applied to the charged surface by a laser beam scanner 11.
etc., and an electrostatic image is formed. The developing device 13 develops the electrostatic image into a magenta toner image, thereby forming a two-color image of yellow and magenta. Then, a laser beam modulated based on an image signal for red is incident on a two-color image forming surface that is uniformly charged in the same manner, and an electrostatic image is formed. A developing device 14 develops the electrostatic image into a cyan toner image. The resulting three-color image consisting of yellow, magenta, and cyan toner images or the incidence of a laser beam modulated based on uniform charging and blue, green, and red image signals on the three-color image forming surface. A four-color image consisting of yellow, magenta, cyan, and black toner images obtained by developing with black toner in the developing device 15 is fed to the feeding means 20 from the cassette 18 or 19.
Alternatively, the image is transferred onto the recording paper fed by the register roller 21 and the registration roller 22 by the action of the transfer device 16. The transferred recording paper is separated from the photosensitive drum 7 by a separator 17 and sent to a fixing device 24 by a conveyor belt 23.

A fixing device 24 fixes the color image on the recording paper, and discharges the recording paper to a paper discharge tray 26 via a discharge roller 25. On the other hand, the surface of the photosensitive drum 7 to which the color image has been transferred is neutralized by a pre-cleaning static eliminator 8, residual toner is removed by a cleaning device 9, and the drum is prepared for the next image forming process.

The conveyor belt 23 of this image forming apparatus conveys the recording paper by attracting it to the surface by suction by a sirocco fan 27. The suction is provided by a sirocco fan 2 installed below the conveyor belt 23, as shown in Figures 1-2.
An intake pipe 28 extending from 7 rises between the upper and lower belts from a gap between the parallel narrow belts 23a constituting the conveyor belt 23, and divides into left and right branch pipes 29a, 29b. are opened at the lower surfaces of the left and right intake boxes 30a, 30b, respectively, so that air is sucked into the intake boxes 30a, 30b from the parallel gaps in the narrow belts 23a facing the upper surfaces of the openings of the intake boxes 30a, 30b. It is done by being That is, in this example, the recording paper is placed on the narrow belt 23a.
They are sucked into the parallel gaps and adsorbed onto the surface of the conveyor belt 23. However, the present invention is not limited to this, and the conveyor belt 23 may have a wide width and many holes are distributed, or the conveyor belt 23 may be made integral over the entire width, and the side surfaces between the upper and lower belts may be covered. , the intake pipe 28 may be connected to the lid.

The exhaust pipe 31 of the sirocco fan 27 is connected to an expansion duct 32 that surrounds a power supply case 33 that houses a power supply section of the image forming apparatus and is connected to an exhaust grill section 34 provided on the outer wall.
is connected to. Therefore, the power supply section is cooled by the suction air of the conveyor belt 23, and the heat of the power supply section is not diffused into the machine.

The image forming apparatus of the present invention may be one in which the document reading section and the image forming/recording section are integrated, or may be one in which only monochromatic images are formed and recorded.

〔Effect of the invention〕

In the image forming apparatus of the present invention, a common fan is used to transport the conveyor belt from the transfer section to the fixing section and to cool the power supply section, which has the excellent effect that heat from the document section does not diffuse into the machine. is obtained.

A...Manuscript reading section 7... Photosensitive drum 17...Separator 23a...Narrow width belt 27...Sirocco fan 29a, 29b--branch pipe 30a, 30b...Intake box 31...exhaust pipe 33...Power supply case 32...Expansion duct 34...Exhaust grill part B... Image forming recording section 16...Transfer device 23... Conveyor belt 24... Fixing device 28...Intake pipe

Claims (1)

[Claims] In an image forming apparatus in which a transfer sheet, on which a toner image has been transferred and separated from an image forming body, is attracted to a conveyor belt by suction and conveyed to a fixing device, the image forming apparatus is installed in a duct that guides the exhaust air of the suction to the outside of the machine. An image forming apparatus comprising: a power supply section.