JPS5835574A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the invasion of toner, by providing a filter in an exposure window of a cartridge stored in a drum. CONSTITUTION:A process kit where a photosensitive drum, a charger, a developer, and a cleaner are stored is pulled out from the copying machine main body and is replaced. A color filter 16 having a wavelength selecting characteristic matched to the color of a toner and the characteristic of the photoreceptor is provided in the exposure window of the process kit which becomes the light path for projection of an original image. The process kit is closed by the color filter 16 to prevent the invasion of the toner, and troubles due to the dirt of the filter are eliminated because the color filter 16 is replaced simultaneously with replacement of the process kit when the process kit ends the life.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus having a process kit that is detachably supported.

Conventionally, a filter member in an image forming apparatus such as a copying machine is
The front part of the light source that illuminates the original, T lens, short focus small II
It was fixed and provided in the middle of the optical path of the image forming apparatus at the rear part of an optical element system such as an optical element.

In such a configuration, the filter member is frequently contaminated by developer scattered during repeated copying operations and horses entering from the outside. In addition, the above-mentioned optical elements were also affected. For this reason, it must be cleaned during regular inspections, and if left unattended, it will affect the light flux Kl& that forms the image, making it impossible to obtain beautiful copied images. Further, conventionally, the filter member has a function of correcting the wavelength of light depending on the spectral sensitivity fK of the photosensitive drum.

Therefore, if you want to obtain a copy image of any color on the original, the company must install multiple filters to replace the filter members and move them according to the original, making it difficult to operate. This was troublesome and had the disadvantage that the machine turned into a large amount of dust.

The present invention addresses the above points and provides a novel and excellent image forming apparatus.

The image forming apparatus according to the present invention is characterized in that a filter member is disposed in the photosensitive drum and the optical image exposure opening provided in the cover of the K-Goose kit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below with reference to specific examples.

FIG. 1 shows a sectional view of a specific example image forming apparatus based on the present invention. A document mounting table made of an IFi transparent member moves back and forth in the direction of the arrow. 2 is a short focus small diameter storage element array; 3
is a photosensitive drum. The original placed on document table 1*
*Slit exposure is performed on the photosensitive drum. 4F! , the photosensitive drum 3 is uniformly charged with a charger. The uniformly charged photosensitive drum 3 is subjected to image exposure by the element array 2 to form an electrostatic image. Next, to the developing device 5>
Be visualized. On the other hand, the transfer-P is sent into the apparatus from the paper feed table on the right side, and is sent onto the drum 3 by the registration roller 7, which rotates at the timing to register the image on the paper feed roller 6 and the photosensitive drum 3. . Next, the toner image on the photosensitive drum 3 is transferred onto transfer paper by the transfer charger 8.

Thereafter, the transfer paper P#i separated from the drum 3 is guided to the fixing device 10 by the guide 9, and after the toner image on the transfer paper is fixed, the paper is discharged onto the tray 12 by the paper discharge roller 11.

Also, a photosensitive drum 3, a band device 4, a developing device 5, a cleaner 13
The filter 16 and the filter 16 are housed together in a cover to constitute a process kit 14. And Mukuro Kitsu) 1
4Fi As shown in Fig. 2, it can be inserted and removed from the main body of the device. In Figure 2, the kits are shown without covers to show the individual units of the 14 kits. Figure 5 shows the process kit 14 with the cover attached.
This is a squint. 17 is a kit cover, and 15 is a window provided on the kit cover for irradiating the drum 3 with the high light exposure. This is a part of the 1611 filter. 18
is a handle for attaching and detaching the kit from the main body of the device. FIG. 4 is a cutaway view of the process kit, showing a filter member 16 attached to the exposure opening 15 of the process kit.

That is, almost the inside of the kit is sealed with glue, except for the cover transfer area.

stomach. Additionally, each process kit has its own filter, so you can choose a filter that suits each process kit. Moreover, when the process kit is replaced, the filter components are also replaced at the same time.

As described above in detail in the specific example, the photosensitive drum and the surrounding purcessing means, that is, the charger, the developing means, the cleaning means, etc., are integrally and detachably supported, and the developer, which may float, is removed from the optical element array. This eliminates the possibility that optical means such as the like will be adversely affected. Furthermore, since the optical image exposure aperture can be sealed with a filter member, the above effect can be further enhanced.

Moreover, since the process unit is replaced after a predetermined period of use, even if the filter member gets dirty, it can be replaced when the dirt is within a certain limit, that is, within the practical range.
It is also extremely suitable for practical use.

Therefore, the apparatus of the present invention is excellent in that it can always form good images.

Furthermore, since a filter member is provided for each process unit, a filter member suitable for the unit photosensitive drum can be selected, which is effective. Moreover, it is easy to configure a process unit equipped with a filter member to obtain a desired copy image for the color source sK, and a wide variety of process units can be made, making it an excellent product that can be used in a wide range of applications. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a specific example image forming apparatus based on the present invention;
Fig. 2 is a perspective view of the same device, Fig. 6 is a perspective view of the process kit section, and Fig. 4 is a sectional view of the process kit section. stage), 5=3jl imager (developing means), 14: Process kit, 16: Filter part, 17: Kit cover 0

Claims (1)

[Claims] (1) A photosensitive drum, a charging means, a developing means, and a tarrying means are integrally supported to form a goose kit, and a filter member is inserted into the photoimage exposure opening provided in the cover of the process kit. An image forming apparatus characterized in that: