JPS6336501B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus having means for collecting floating substances such as ozone or dust.

Conventionally, in image forming apparatuses such as electrophotographic copying machines, other parts of the machine have been contaminated by ozone generated from a charger or the like during image formation, or by dust generated from the vicinity of a developing unit or cleaner. There was a risk that floating objects could be inadvertently discharged outside the aircraft and cause indoor contamination.

Hereinafter, an electrophotographic copying machine using a drum-type photoreceptor will be explained as an example.

The recent trend in copying machines is to use a drum type in which a charging system, developing system, cleaning system, paper feeding system, etc. are arranged around the photoreceptor drum. A treatment mechanism for treating floating matter was further arranged around the drum, which often took up a considerable amount of space.

SUMMARY OF THE INVENTION Therefore, the present invention provides an image forming apparatus that can effectively utilize the space inside the machine and efficiently collect these floating objects.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view thereof.

In the figure, 1 is a photoreceptor cylinder whose outer peripheral surface is covered with a photoreceptor. Flanges 2 and 3 are deceptively attached to the photoreceptor cylinder, and a bearing 4 is attached to the flange 3. Further, the flanges 2 and 3 are fastened to each other by long screws 5, so that the photoreceptor cylinder 1 and the flanges 2 and 3 are integrally constituted to form a photoreceptor drum 14.

Next, on the main body side, reference numeral 6 denotes a rear side plate of the main body, and a hollow drum shaft 8 that rotatably supports a photosensitive drum 14 is fixed to a housing member 7 attached to this rear side plate 6. Further, a bearing 9 is attached to a portion of the housing material 7, and a bearing 10 is also attached to the drum shaft side. Further, reference numeral 11 denotes a photosensitive drum driving gear rotatably attached to the drum shaft 8 via bearings 9 and 10.
This gear 11 is driven by transmission of driving force from a driving source (not shown). And the gear 11
A pin fitting hole 2a is formed in the flange 2 of the photoreceptor drum 14 by the pin 12 which is caulked.
are engaged, the photoreceptor drum 14 is connected to gear 1.
Rotated by 1. Next, 13 is a front side plate. This front side plate 13 is fitted with a centering plate 16 that fits onto the drum shaft 8 and is fitted with a pin 15 to ensure the position of the photoreceptor drum 14 in order to properly position the photoreceptor drum 14. is installed. Further, this centering plate 16 is provided with a duct 17 according to an embodiment of the present invention. This duct 17 is connected to a charger 1 disposed on the circumferential surface of the drum.
8a, 18b, 18c, 18d are for collecting ozone or dust generated from the developing device 19, cleaner 20, etc. One drum has an opening a near the circumferential surface of the drum 14, and the other has a hollow drum. It is attached with an opening b connected to one end 8a of the shaft 8. Further, a pipe 21 connected to a suction blower (not shown) is attached to the other end 8b of the hollow drum shaft 8.

With the above configuration, ozone or dust generated on the circumferential surface of the drum is efficiently sucked through the opening a of the duct 17 located near the drum, passes through the inside of the duct 17, and passes through the opening b. , passes through the drum shaft 8, and then passes through the pipe 2.
1 and is collected by a suction blower (not shown).

The first advantage of the above configuration is ease of handling. That is, when the drum is taken out from the main body for cleaning or inspection, first the centering plate 1 is used as a means for supporting the support shaft of the drum at one end.
6 and pull out the photoreceptor drum 14 in the direction of arrow C. In this case, at the same time as the centering plate 16 is removed, the connecting portion between the duct opening b and the drum shaft 8 can be easily removed by unfitting the drum shaft 8. Eliminates the hassle of removing the drum. The second advantage is that by making effective use of the drum shaft of a drum that could not be used in the past, it is possible to save space, and it is also possible to reduce the weight and cost of the drum shaft. It is desirable that it be hollow, and in this embodiment, by utilizing this hollow space, the drum shaft is used not only as a drum support but also as a guide pipe for guiding floating matter to the blower.

As described above, in the present invention, the support shaft of the photoreceptor drum is hollow, and ozone, dust, etc. generated around the photoreceptor drum are collected using the hollow portion of the support shaft. In addition, since ozone and the like are sucked by the duct member from the side end of the generating means, the walls of these generating means can be used as part of the duct member, and in conjunction with the use of the rotating shaft, This makes it possible to effectively utilize space and efficiently collect ozone, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a copying machine to which an embodiment of the present invention is applied, and FIG. 2 is a perspective view thereof. In the figure, 1... photoreceptor cylinder, 2, 3... flange, 4... bearing, 6... rear side plate, 7... housing material, 8... drum shaft, 9, 10...
...Bearing, 11...Gear, 13...Front side plate,
14... Photosensitive drum, 16... Centering plate, 17
...Duct, 21...Pipe.

Claims (1)

[Scope of Claims] 1. An image forming apparatus in which an electrophotographic photoreceptor drum is attached to a support shaft, the electrophotographic photoreceptor drum having one end supported by a main unit, and serving as a support shaft for the photoreceptor drum and having one end inserted into the shaft. a hollow shaft that forms an air flow flowing at the other end; a means that faces the photoreceptor drum and generates ozone or dust during image formation; and a side surface between the means for generating ozone or dust and the photoreceptor drum. and an opening for sucking ozone or dust generated from the means facing the photoreceptor drum, and guiding the airflow sucked from this opening to an opening at one end of the hollow shaft of the photoreceptor drum. An image forming apparatus comprising: a duct member forming an air flow path; and supporting means for the hollow shaft.