JPS60169858A - Copying machine - Google Patents

Abstract

PURPOSE:To enable effective use of a space in a fixed drum and reduction of the size of an apparatus by housing various kinds of electric equipments in the drum in the middle zone of a photosensitive belt. CONSTITUTION:An electric equipment housing box 40 houses the power supply circuit board of a copying machine, and the high voltage power source of an electrostatic charger. Rail-shaped metallic members 41 can fix a drum 23 and the box 40. Heat generated from the electric equipment is exhausted out of the drum 23 with a cooling fan 42 fixed to the end of the drum 23 to cool the inside of the drum 23. The box 40 is arranged in the drum 23 to utilize a space in the drum 23. The fan 42 draws in the fresh air and passes it through the space narrowed with the box 40 filled with the electric equipment, between the drum 23 and the box 40 to cool the inside of the drum 23 effectively even by using the small capacity fan 42.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying machine using an electrophotographic belt-shaped photoreceptor.

Conventional configuration and problems Generally, electrophotographic copying machines run a drum-shaped or belt-shaped photoreceptor and are equipped with various devices arranged around it, and by combining these devices, it can be used as a copying machine. It consists of several processes, and there is a tendency for the equipment to become larger. Recently, there has been a strong demand for smaller copying machines, and belt-shaped photoreceptors have been used to reduce the space required for the photoreceptor and thereby downsize the apparatus. FIG. 1 is a side view of a conventional copying machine using a belt-shaped photoreceptor. In FIG. 1, 1 is a driving roll of the photoreceptor, 2 is its driven roll, 3 is an auxiliary roll arranged between the driving roll 1 and the driven roll 2, and 4 is an organic photoconductor (OPC). A belt-shaped photoreceptor (hereinafter referred to as photoreceptor),
It is made to run between a driving roll 1 and a driven roll 2. Reference numeral 6 denotes a charger for both charging and transfer, which charges the photoreceptor 4 and connects the exposure lamp 6a and the cell-hook lens 6b.
An electrostatic latent image is formed by the optical device 6 having the following, and a toner image is formed by development g=y. Reference numeral 8 denotes a paper feed cassette, which feeds copy paper 9 through a paper feed port to 10, guides it to a transfer guide 12 by a pair of transport rolls 11, and electrostatically adheres it to the 1-ner image on the photoreceptor 4. and transfer it to copy paper 9 using charger 5. 1
Reference numeral 3 denotes a separation claw that separates the copy paper 9 from the photoconductor 4. The copy paper 9 is sent to the fixing device 16 by the fixing guide 14, the toner image is fixed by the fixing device 16, and the paper is discharged to the paper discharge tray 16. It is something. Reference numeral 17 denotes a cleaning device for removing residual toner on the photoreceptor 4 after transfer, and reference numeral 18 denotes a charge removal lamp for removing the charge on the photoreceptor 4. 19 is a document table, and 2o is a main body of the copying machine.

However, in the above configuration, the three rolls of the photoconductor drive roll 1, its driven roll 2, and the auxiliary roll 3 located in the intermediate area between these two rolls are called the photoconductor running device 1; The auxiliary roll 3 inside runs the photoreceptor 4 using the driving roll 1 and the driven roll 2.
When charging by the charger 5, it plays an important role in determining the distance accuracy between the charger L6 and the photoreceptor 4.

Furthermore, the accuracy of the distance between the photoreceptor 4 and the SERPOC lens 6b of the exposure wave @6 which forms an electrostatic latent image on the photoreceptor 4 by exposure has a great influence on the quality of the copied image.

Therefore, if the diameter accuracy of the auxiliary roll 3 is low, or the rotation axis accuracy is low, and the rotation of the auxiliary roll 3 is unstable, the distance between the photoconductor 4 and the charger 5 will vary during charging, and when the photoconductor 4 is charged. The surface potential and the density of the surface potential and the 4-marked copy image will vary. 1. During exposure, if the distance between the photoreceptor 4 and the self-hook lens 6b varies or if the auxiliary roll rotates 30 times, defocus or double images will occur, resulting in only low-quality images being obtained. It had In addition, in order to compensate for this drawback, the auxiliary roll 3 must be made with high precision, resulting in an increase in cost.

OBJECTS OF THE INVENTION The present invention aims to improve the accuracy of charging and exposure, efficiently utilizes the space of a photoreceptor drive unit, and is compact.

The object of the present invention is to provide a copying machine that is inexpensive and can produce high-quality images.

Structure of the Invention The copying machine of the present invention has a structure in which electrical components are housed inside a drum fixedly disposed in an intermediate area between a photoconductor driving roll and a photoconductor driven roll, and a cooling fan is installed. This makes it possible to obtain high-quality images with a small size and low cost.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 is a side view of a copying machine according to an embodiment of the present invention. In FIG. 2, 21 is a photoreceptor drive roll with a diameter of 30;
22 is a photoconductor driven roll with a diameter of 26 mm, and 23 is a diameter of 1
The drum is a fixed drum made of 0.00 mm aluminum, larger in diameter than the photoreceptor drive roll 21 and photoreceptor follower roll 22, and has a surface with reduced friction. Reference numeral 24 denotes a belt-shaped photoconductor (hereinafter referred to as photoconductor) using an organic photoconductor (OPC), which can be run by a photoconductor driving roll 21 and a photoconductor driven roll 22, and the photoconductor 24 is something that is adhered to the surface of the drum 230 and runs as a middle part b. Reference numeral 26 denotes a charging charger that charges the photoreceptor 24 by corona discharge, and 26 an optical exposure device having an exposure lamp 26a and a cell-hoc lens 26b, which exposes the surface of the charged photoreceptor 24 to form an electrostatic latent image. It is something that forms.

The photoreceptor 24 on which the electrostatic latent image has been formed travels and the developing crystal 2
7, the toner is electrostatically attracted onto the photoreceptor 24 and visualized, forming a toner image. 28 is a paper feed cassette, and 29 is copy paper, which is fed by a copy paper 29rri and a paper feed roll 30. The fed copy paper 29 is transferred to one of the photoreceptors 24 by a transfer guide 32 by a pair of transport rolls 31.
- The transfer charter 3 is guided over the toner image, and the toner image is sandwiched between the photoreceptor 24 and the copying paper 29.
3, the transfer charger 33 discharges corona and transfers the toner image onto the surface of the copy paper 290. 34 is a separating claw that separates the copy paper 29 from the photoconductor 2a when the photoconductor 24 and the copy paper 29 advance at the same speed, and the copy paper 29 is separated.
The toner image on the copy paper 29 is guided by a fixing guide 36, fixed by a fixing device 36, and reaches a paper discharge tray 37.

On the other hand, the toner image on the photoreceptor 24 is transferred to the transfer charger 33.
After transferring to the copy paper 29, the cleaning device 38 removes the transfer residue on the photoreceptor 24, and the charge on the photoreceptor 24 is removed by the neutralization lamp 39, thereby completing the process of using the copying machine. do. By the way, 4o is a storage box for Nak's products, and the power supply circuit board for the copying machine and the high-voltage power supply for the charger are stored therein. Reference numeral 41 denotes a rail-shaped fixing fitting that can fix the drum 23 and the electrical equipment storage box 40. Reference numeral 42 denotes a cooling fan fixed to the drum 23, which cools the inside of the drum 23 by discharging heat generated from electrical components to the outside of the drum 23. Reference numeral 43 designates a document table, 44 a main body of the copying machine, 45 a copy paper box that can store spare copy paper, and 46 a toner box that can store a spare 1-car. 3 and 4 are front views of the photoconductor running device of the copying machine of this embodiment, and show only the main parts related to the configuration of this embodiment, and the photoconductor running device 1 mainly shows the photoconductor running device. It consists of a body driving roll 21, a photoconductor driven roll 22, a drum 23, a photoconductor 24, etc., and a belt-shaped photoconductor 24 is run.

FIG. 3 is a front view of the photoreceptor running device 1 without the photoreceptor 24 mounted thereon, and FIG. 4 is a front view of the photoreceptor running device with the photoreceptor 24 mounted thereon.

In FIGS. 3 and 4, the same members as in FIG. 2 are given the same numbers and their explanations are omitted. 47 indicates that the drum 23 is disposed in the intermediate area between the photoreceptor driving roll 21 and the photoreceptor driven roll 22. , and is provided to increase the actual distance between these two rolls, and is designed to stretch the photoreceptor 24.

With this configuration, the photoreceptor 24 travels while contacting the surface of the drum 23, so if the distance between the drum 23 and the charger 25 and the distance between the drum 23 and the self-hock lens 26b are set to optimal values as shown in FIG. Since the drum 23 is fixed, there is no rotational wobbling unlike the conventional auxiliary roll 3, and stable charging and exposure are possible, resulting in high quality copies without uneven density or out of focus. Images can be easily obtained, and precision machining of the auxiliary roll 3 used in the conventional configuration is not required.

In addition, arranging the electrical equipment storage box 4o inside the fixed drum 23 makes effective use of the space inside the copying machine, and also allows for a spare copy paper box 46 to be placed inside the copying machine.
, a toner box 46 can be provided, and the copying machine can be made smaller.

Furthermore, it is advantageous in terms of insulation for assembly manufacturing and maintenance work.

The cooling fan 42 attached to the end of the drum 23 in FIG. Cool the inside. This is due to the heat generated from electrical components and the frictional heat generated due to the contact of the photoreceptor 24 with the drum 23 as it travels.
This is to prevent the surface temperature of the photoreceptor 24 from increasing by increasing the temperature within the photoreceptor 24, thereby affecting the photosensitive performance of the photoreceptor 24, and causing a change in the density of the image. Since the electrical equipment storage box 40 stores the electrical equipment in the drum 23, the air passage becomes small, and even the cooling fan 4o with a small capacity can be efficiently cooled.

Effects of the Invention V From the above, the present invention has the following advantages:
By effectively using the space inside the drum, you can create more space and make the copying machine more compact. Assembly, manufacturing, and maintenance and inspection work can be easily performed. A cooling fan is placed on the drum to reduce the temperature of the drum and photoreceptor. It is possible to easily prevent image variations due to temperature characteristics of the photoreceptor.

Even if the capacity of the cooling fan is small, the air passage can be made smaller by arranging the electrical equipment storage box inside the drum.
The drum can be cooled efficiently.

Furthermore, due to the effects mentioned above, it is possible to provide a copying machine that is small, inexpensive, and can produce high-quality images, and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional copying machine, and FIG. 2 is a side view of a conventional copying machine.
FIG. 3 is a side view of the copying machine according to the embodiment, and FIG.
The figure is a front view of the photoconductor traveling device with the belt-shaped photoconductor attached thereto. 21...Photoconductor drive roll, 22...Photoconductor slave yvy -/l/, 23...Drum, 2
4...Belt-shaped photoreceptor, 40...Electrical equipment storage box, 42...-Cooling fan. Name of agent: Toshio Nakao and one other person Figure 1 Figure 2

Claims (1)

[Claims] A copying machine that houses electrical components inside a drum that is fixedly placed in an intermediate area between a photoconductor driving roll and a photoconductor driven roll, and is equipped with a cooling fan.