JPS5890666A - Preventing method for scatter of magnetic developer - Google Patents

Abstract

PURPOSE:To easily prevent a scatter of a developer by arranging a magnet between a generation source for a scattered developer and a body to be stuck. CONSTITUTION:A magnet 23 is arranged between a preliminary discharger 2 and a cleaner 22, and a magnet 24 is arranged between a secondary discharger 5 and a developing device 10. Those magnets 23 and 24 are longer than the axial length of a photoreceptor 1; the magnet 23 captures a scattered developer from the cleaner 22, and the magnet 24 captures a scattered developer from the developing device 10, thus preventing the developer from sticking the preliminary discharger 2, secondary discharger 5, fluorescent lamps 3 and 8, a charger 4, a potential sensor 9, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing scattering of a copying machine using a magnetic developer.

In a copying machine that uses a powder developer to visualize an electrostatic latent image on a photoreceptor and transfers this image to transfer paper to obtain a copy,
Developer scatters from sources such as developing devices and cleaners, and this adheres to charging wires, lamps, and other members to which the scattered developer adheres, and is one of the causes of deterioration in copy quality. There is. Conventionally, in order to prevent this developer from scattering, a duct was installed near the developing device to collect the scattered developer using air, or by sending clean air into the charging device. , measures are taken to prevent the intrusion of scattered developer. However, all of these require an expensive blower and a dedicated space for the duct, which poses problems in practical use, and there is also a risk that secondary scattering may occur due to the air.

The present invention eliminates the drawbacks of the above-mentioned conventional examples and provides an inexpensive and reliable method for preventing scattering of magnetic developer.

In the present invention, magnets are placed at various locations between sources of magnetic developer scattering, such as the developing device and cleaning means, and members to which the developer adheres, such as the strip "ta" and the exposure lamp, which are likely to be adversely affected by the adhesion of the developer. This magnet attracts and collects the magnetic developer that is about to fly away.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 11 is a cross-sectional view showing an example of an Enoki copying machine using a magnetic agent in which the present invention can be effectively utilized.

In the figure, the photoreceptor 1 rotates counterclockwise, and the charge remaining on the photoreceptor 1 during gIJ copying is evenly leveled out by the PA remover 2 and the firelight lamp 3, and then the electric charge remaining on the photoreceptor 1 during gIJ copying is leveled out. A primary charger 4 applies a primary charge. If part of the light from the fluorescent lamp 3 is applied at the same time as the primary charging, the photoreceptor 1 is uniformly charged. Next, static electricity is removed by a secondary static eliminator 5 while applying image exposure I. In addition, 6 is a fluorescent tube that lights up when the optical system is reversed, that is, when the light I of the painting III does not hit.
The non-image area is whitened to prevent toner from forming a layer as described later. Further, when a small size copy is made with a miniature ball, the area of the photoreceptor that is not transferred to the copy paper is whitened to prevent toner from adhering to it. 8 uses a fluorescent lamp to perform so-called total light, which increases the contrast of the a-color produced by primary charging and secondary static elimination. The potential fIt9 is used to determine the state of the photoreceptor 1 by performing the above-mentioned secondary electricity removal, secondary electricity removal, and full exposure prior to the copying operation, and to adjust the high voltage applied for primary charging and secondary electricity removal accordingly. do.

The nine latent images obtained are visualized in a developing device 10.

Specifically, the toner 'r is applied to a photoreceptor by the so-called jumping development method described in Japanese Patent Application Laid-open No. 55-18656-9.
I am drawn to the latent image above. Incidentally, when the toner in the developing device 10 becomes low, it is replenished from the hopper 11 in a timely manner. Next, the potential on the photoreceptor is leveled to approximately Ov (any voltage may be used as long as it is uniform) using the pre-transfer charger 12 and the miniature bulb 13.

Thereafter, the toner image is transferred to the copy paper P by the transfer charger 14, the charge injected into the copy paper is eliminated by the separation charge eliminator 15, and separated by the air flowing out from the nozzle 16. Next, the copy paper P is guided by a fixing guide 19a via a conveyor belt 19 which is passed between pulley shafts 17 and 18.
While passing between the fixing roller 20 and the pressure roller 210, the image is fixed by heating or pressure, and is discharged outside the machine.

The remaining toner after transfer is scraped off by the cleaner 22.
Now on to the next copying process.

In the copying maple having the above-described configuration, - the magnet 23 is placed between the static eliminator 2 and the cleaner 220, and the secondary static eliminator 5 and the developing device 10 are placed between the static eliminator 2 and the cleaner 220;
A magnet 24 is placed between 0 and 0. These magnets 23.2
4 has a length equal to or longer than the axial length of the photoreceptor, and the magnet 23 collects the developer scattered from the cleaner 22.
- The stone 24 collects the developer scattered from the current slurry a10, removes the electric charger 2, the secondary static eliminator 5, the fluorescent lamps 3 and 8,
- Preventing developer from adhering to the cleaner Km4, potential sensor 9, etc.

Furthermore, if the magnets 23 and 24 are made removable, they can be easily cleaned. Furthermore, by attaching a rubber magnet to the shield of a charger or a static eliminator, a light shielding effect, an effect as a retainer for the photoreceptor, etc. can be expected.

As explained above, in an image forming apparatus such as a copying machine using a magnetic developer, by placing a magnet between the source of developer scattering and the broken bamboo or willow, developer scattering can be easily and inexpensively prevented. It can be prevented.

[Brief explanation of the drawing]

The figure is a schematic sectional view of an acid-immersed copying machine to which the present invention is applied. In the figure, 1 is a photoreceptor, 2 is an electric device, 3 and 8 are fluorescent lamps, 4 is a charger, 5 is a secondary static eliminator, 6 and 7 are miniature bulbs, and 9F
i Potential sensor, 10 is a developing device, 11 is a magnetic developer, 1
2 is a pre-transfer charger, 13 is a miniature bulb, 14 is a transfer charger, 1
5 represents a static eliminator, 16 an air duct, 19 a conveyor belt, 20 a fixing roller, 21 a pressure roller, 22 a cleaner, and 23 and 24 magnets. Applicant Canon Co., Ltd.

Claims (1)

[Claims] A magnet is disposed between a source of scattering of magnetic developer, such as a developer spear or cleaning means, and a member to which the magnetic developer adheres, and the floating magnetic developer is attracted to the magnet. A method for preventing scattering of a magnetic phenomenon agent.