JPS61163362A - Dust collector of electrophotographic device - Google Patents

Abstract

PURPOSE:To reduce considerably the dirt due to a toner in a machine by wrapping outside peripheral surfaces of both end parts of a photosensitive drum with a duct having air intake ports and connecting this duct to a bleeder. CONSTITUTION:Air intake parts A and B consisting of air intake ports 18, 19, and 20 are provided to wrap outside peripheral surfaces of both end parts of a photosensitive drum 1, and they are connected to the bleeder through ducts 21 and 22 constituting an air intake duct 14. The air intake port 18 is formed with the gap between the outside peripheral end face of the photosensitive drum 1 and a bending edge 16 of the air intake end, and the air intake port 19 is formed with duct side faces 15 and 17. Since this air intake duct 14 is provided, air currents going toward air intake parts A and B are formed in the machine, the toner is put on these air currents and is discharged even if the toner is scattered. Thus, the dirt due to the toner is kept slight even in case of 50,000 copies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a known dust collector for an electrophotographic apparatus. Conventionally, a large number of inventions and ideas have been made and put into practical use in dust collectors used in electrophotographic apparatuses, but in response to the toner scattering rate, there is a problem in collecting the scattered toner. The upper part near the opening of the developing device used for development, where there is a lot of scattering.
Or, it is customary to place the air inlet of the dust collector at the bottom, or even at the top and bottom. Although the present invention is not particularly described with respect to the developing device,
It has a structure that causes extremely little toner scattering, and in particular, the front and rear of the blade that scrapes off the toner from a cleaner used for development, such as removing the developing part of a magnetic brush and removing the toner from the cleaner, is sealed with the photosensitive member. It is. As described above, it is appropriate to prevent toner from scattering from devices that cause a lot of toner scattering. The effectiveness of the present invention can be evaluated by checking the dirtiness of the double charger 13, which performs alternating current corona discharge, which transfers the toner onto the paper and peels off the paper after the transfer. An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a partially cutaway side view of an electrophotographic apparatus showing essential parts including the present invention. In a known electrophotographic apparatus, a developing device 4 that performs static elimination, charging, and exposure (not shown) for a photosensitive seven-layer IT, a double charger 13 and a cleaner 12 that perform transfer and peeling, and an intake cylinder 14 are shown. Paper from a paper feed cassette (not shown) is conveyed through a conveyance path 24. The developing device 4 includes a magnetic roller 6 with magnetic poles attached at predetermined positions within the substrate 5.
and a sleeve 7 made of non-magnetic material on the outside.
is rotated in the direction of the arrow, and the developer collected in the sleeve 7 is shaped by the doctor part 9 to form the magnetic brush 8. In order to prevent toner from scattering from the magnetic brush 8,
Seal portions 10 and 11 are applied to the magnetic brush 8 except for the portion to be subjected to development. As mentioned above, scattering of toner from the developing device 4 is reduced. The intake duct 14 provided to the paddy dust collector will be described. As shown in the cross section of FIG. 1 and the perspective view of FIG. The intake port 18 is shaped to wrap around the edge.
is formed by the gap between the outer peripheral edge surface of the photosensitive drum 1 and the intake end curved edge 16, and the intake port 19 is formed by the duct side surface 15 and the duct curved surface 17. It is an intake part that wraps around the outer peripheral edge of the air cleaner 1 on all sides, and is attached to the cleaner 12 side as shown in the figure. An inlet 20 penetrating the inlet 19 is provided on the side of the developing device 4, and the circumferential edge portion of the photosensitive drum 1 extending between the developing device 4 and the cleaner 12 is connected to the inlet 18, 19, and 20. wrapped. The above-mentioned intake air dA and B are in the duct 2
1, and is connected to a central duct 22 to an air extraction device via a filter (not shown). Naha flange 23
is for improving the connection with a predetermined duct.

Next, the function and effect of the intake duct 14 will be described.The intake ports 18 of the intake sections A and B are
．． On 19 and 20.

Air flows in the vicinity thereof and is taken in through the duct 21 and the central duct 22. Therefore, the photosensitive drum 1, the cleaner 12, and the developing device 4 are connected.

Since the air inside the machine on the side of the double charger 13 always flows toward the intake portions A and B, even if toner scatters, it will not stay inside the machine due to the above-mentioned airflow. The conventional double charger got dirty after copying zooo sheets, but the one with the intake duct had less dirt even when copying 5αOO sheets than when copying zooo sheets.

By attaching the intake duct 14 as described above, it is possible to prevent the inside of the machine from getting dirty, and the oil and air system is also similar to that of conventional processors.
That's fine.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view including the main parts of the present invention, and FIG.
The figure is a perspective view of the intake duct 14. 14...Intake duct

Claims (1)

[Claims] In a dust collector of an electrophotographic apparatus, both outer peripheral edges of the photosensitive drum extending over a developing device and a cleaner arranged so as to narrow the photosensitive member are wrapped in a duct forming an air intake port, and the duct is A dust collector for an electrophotographic device that is connected to an air extraction device.