JPS6069676A - Cleaning auxiliary agent applying device - Google Patents

Abstract

PURPOSE:To improve a cleaning property of a residual toner on a photosensitive body by providing a cleaning auxiliary agent which is separated and opposed along the circumferential surface of a sleeve, between a tuft rise control plate and a developing area, and providing a magnet on its supporting plate. CONSTITUTION:When a cleaning auxiliary agent C such as fatty acid metallic salt, etc. is used for a cleaning auxiliary agent applying device, a magnetic toner T which is controlled by a tuft rise control plate 7 and carried by adhering to the circumferential surface of a non-magnetic sleeve 3 is stirred up by a mutual action of a magnetic force of a magnet roll 4 and a magnet. Therefore, the magnetic toner T scrapes a little the cleaning auxiliary agent C and moves to a developing area 11, an electrostatic latent image on an image carrying body 1 is developed, and the cleaning auxiliary agent C is supplied to the image carrying body 1. The cleaning auxiliary agent C exists together with a residual toner on the image carrying body 1, and a cleaning performance by a blade is improved. In this way, it is avoided that a device is made large-sized and its cost is raised.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in an electronic recording device such as an electrophotographic copying machine, and is used for cleaning residual toner deposited on an image carrier. Applying a cleaning aid to the VC1 current agent to improve its properties/,) J: Regarding the improvement of the cleaning aid coating device for Uni 1.7'c! Meeting)).

[Prior art]

A blade cleaning device that cleans the electrophotographic photoreceptor by moving an elastic rubber blade onto the photoreceptor is often used. However, in reality, many blades are cleaned not only by cleaning the blade alone, but also by using a lubricant in combination with a cleaning aid. Numerous applications have been filed.

Methods of using a cleaning aid in combination include a method of externally adding the cleaning aid to the developer and a method of mechanically applying the cleaning aid. The method of externally adding a cleaning aid to the developer is to incorporate the cleaning aid into the Mlfa agent, which improves cleaning performance and improves stability, but changes the physical properties of the developer, such as mobile phones, etc. Although initial image density changes, changes in image density and image quality occur during copying. Further, there are disadvantages in that the cleaning aid may disintegrate depending on its concentration in the developer, causing it to stick to the developing sleeve and deteriorating the image quality.

Examples of methods for mechanically applying cleaning aids include a device that applies the cleaning aid to a photoreceptor drum as described in U.S.P. , S, P, 415
Publication No. 8498 and Utility Model Application Publication No. 56-1104584:! As published, Blade E2. Devices have been proposed for supplying cleaning aids to a cleaning agent. There are several methods for mechanically applying the cleaning agent as described above, since it is necessary to newly install the coating equipment. In particular, C has been a major hindrance for copying machines that aim to be more compact and lower in price.

[Purpose of the invention]

INDUSTRIAL APPLICABILITY The present invention is effective in an electrophotographic process, particularly in an electrophotographic process using a magnetic toner-5 disc developer,
This improves the cleaning performance of residual toner on the photoconductor and prevents deterioration of the photoconductor and cleaning member.
To provide a cleaning aid coating device which can stably supply a cleaning aid without changing the physical properties of the coating agent, and can avoid an increase in the size of the device and accompanying cost increase.

[Structure of the invention]

The present invention achieves the above object, and consists of a magnet and a trolley inside, a non-magnetic sleeve covering the outer periphery of the magnet roll, and a magnetic developer attached and conveyed on the non-magnetic sleeve. A cleaning aid is provided in a developing device having a buffing regulation plate for regulating the buffing, which is spaced apart from the sleeve between the buffing regulation plate and the developing area, and facing the sleeve curvature along the sleeve curvature. The present invention provides a cleaning aid coating device characterized by the following.

〔Example〕

FIG. 1 shows a sectional view of a cleaning aid coating device and a developing device according to a first embodiment of the present invention. Reference numeral 1 denotes an image carrier such as an electrophotographic photoreceptor, which is coated or deposited on the circumferential surface of a drum rotating in the direction of the arrow. Reference numeral 2 denotes a developing device for developing the electrostatic latent image formed on the substrate 1.

The developing device 2 includes magnets 9, which are alternately magnetized with S-)N-+8-+N. There is a trolley 4 which rotates clockwise at high speed around a rotating shaft 5. Further, 3 is a cylindrical non-magnetic sleeve that rotates the outer edge of the above-mentioned mag +7 troll 4 gently counterclockwise around the rotating shaft 5. A bias voltage is applied to the nonmagnetic sleeve 3 by a bias power supply 9.

Reference numeral 6 denotes an fJJ transfer agent reservoir, and a one-component type magnetic toner T is stored in the developer reservoir 6. Reference numeral 7 denotes a spike control plate, which is provided with a slit-shaped gap between the surface of the non-magnetic sleeve 3 and d. The magnetic toner T that has passed through this gap d adheres to the circumferential surface of the non-magnetic sleeve 3 with a uniform thickness, moves in a counter-chronological direction, and is conveyed to the developing area 11. In the developing area 1, the latent image on the image carrier 1 is developed.

The present invention provides a cleaning aid support plate 8 which is spaced apart from the non-magnetic sleeve 3 between the spike regulating plate 7 and the developing area 11 and along the sleeve surface. The cleaning aid C is provided on the surface facing the circumferential surface of the magnetic sleeve 3 with a gap of 4 between the circumferential surface of the non-magnetic sleeve 3 and the circumferential surface of the non-magnetic sleeve.

Here, the cleaning agent support plate 8 may be made of a magnetic material or a non-magnetic material. However, in this case, by using the cleaning aid support plate 8 as a magnet, or by providing a magnet 88 near the cleaning aid support plate 8, and using the location where the cleaning aid C is provided as a developer spike member, the present invention can be realized. The effect of invention is a dog.

FIG. 2 shows the main part of an embodiment in which a magnet is provided on the cleaning aid support member 8 and a V is formed to make the developer stand up at the location where the cleaning aid C is provided.
) is one in which rubber magnets 81n whose surfaces are magnetized alternately with NS@ are attached to the cleaning aid support member 8. FIGS. 2(b) to 2(d) all show rubber magnets magnetized by the amount ζ in the thickness direction, and rubber magnets 82a and 83 with different magnetization states.
a, 84a, which is attached to the cleaning aid support member 8; FIG. 2(e) also shows a rubber magnet 85a magnetized in an oblique direction, which is attached to the cleaning aid support member 8 in the same manner as in the previous embodiment. FIG. 2(f) shows another embodiment, which includes a cleaning aid support member 8 provided along the circumferential surface of the non-magnetic sleeve 3 and a magnet 86a provided apart from the support member 8. The developer spikes are arranged in one row. All of the cleaning aids C are provided inside the cleaning aid support member 8.

Preferred cleaning aids are friction-reducing materials, and representative friction-reducing materials having the above properties are preferably saturated or unsaturated, substituted, having 8 to 35 carbon atoms. or unsubstituted fatty acids or metal salts of the above fatty acids; -1l aliphatic flucols equivalent to the above acids; monohydric and polyhydric alcohol esters of the above acids and corresponding amides; polyethylene glycol and methoxy-polyethylene glycol; terephthalic acid, isophthalic acid ,2
, 5-zincyl terephthalic acid, 2,5-dichloroterephthalic acid, P-phenylene diacrylic acid, anisic acid, terephthalaldehyde, terephthalic acid metal salts such as sodium terephthalate; cholesterol; dechlorane or perchloropentacyclodecane; approx. Polycaprolactone with a molecular weight of 4,000 or less; low molecular weight fluorocarbon compounds such as waxy short chain telomer of tetrafluoroethylene, low molecular weight staining polytetrafluoroethylene powder, etc. The metal salts of the above fatty acids are lithium, sodium, potassium, copper, rubidium, silver, magnesium, calcium, zinc, strontium, cadmium, barium, mercury, aluminum, chromium, tin, titanium, zirconium, lead, manganese, iron, cobalt. Ammonium salts and diconverted ammonium salts of fatty acids are also contemplated, including, but not limited to, salts of nickel, salts of nickel, and mixtures thereof. acid, capric acid,
Undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, lumitic acid, margaric acid,
Contains stearic acid, aragic acid, behenic acid, lignoceric acid, cerotic acid, and mixtures thereof.

Corresponding solid fatty alcohols, esters, amides, derivatives and mixtures thereof are also contemplated.

Particular monohydric and polyhydric alcohol esters of fatty acids contemplated are derived from 01-Coo alcohols which form fatty acid esters that are solid under the intended conditions of use. For example, methyl, ethyl, propyl alcohol, etc. or argylene diols and triols of 2 to 10 carbon atoms at least partially esterified with C6 to CSI fatty acids are contemplated. Examples of contemplated esters include methyl stearate, ethylene glycol monostearate, glyceryl tri(l,2-oxystearate), 1,2,4-butane triol tristearate, and the like.

Polyethylene glycol and methoxypolyethylene glycol are 1. It is a condensation product known commercially as sous. The intended carbowax is about 60
It is a solid waxy substance with a molecular weight of up to 0.00.

Among the above substances, fatty acid metal salts, particularly zinc stearate, are preferred. These cleaning aids σ) may be in either powder or solid form, or are preferably provided in a solid state on the inner surface of the cleaning aid support member 8σ). In order to make a powder substance into a solid under normal conditions, (1) Melt it with heat and shape it.

(2) Dissolve with solvent and mold.

(3) Forming by applying pressure.

There are other methods.

When the above-mentioned cleaning aid is used in the cleaning aid coating device U of the present invention, the magnetic toner T is regulated by the spike control plate 7 and is transported while adhering to the circumferential surface of the non-magnetic sleeve 3.
is violently disturbed by the interaction of the magnetic force between the magnet, the troll 4 and the magnet 8a, and the disturbed magnetic toner T is developed by scraping off a small amount of the cleaning aid C even though the above-mentioned gaps are in the relationship d and (d). As the latent image is developed on the image carrier 1, the IJ = auxiliary agent C is supplied to the image carrier 1.

Even after the toner image formed on the image carrier 1 is transferred to the recording paper, the cleaning aid C remains on the image carrier L along with the residual toner, improving the cleaning performance of the next step of cleaning with a blade. let Also, the image carrier 1
This prevents deterioration of the blade, which is a cleaning member.

Furthermore, when the magnetic toner T passes through the buffing regulation plate 7,
Even in the case where white streaks occur on the toner 1- on the non-magnetic sleeve 3, which should be uniform in temperature due to aggregated toner, etc., a new magnet 8a as explained in the above embodiment can be provided. The white streaks are eliminated by causing severe disturbance and blistering at the relevant location, and when reaching the developing area 11, the U-BixT developing device manufactured by Konishi Roku Photo Industry ■ is placed on the non-magnetic sleeve 3 (Experiment 1). Modified as shown in Figure 1, using developer and 1-component developer,
Furthermore, an organic photosensitive material was used as the image carrier 1, and the cleaning part was cleaned by an elastic rubber blade. 8
attached to the bottom of the.

When a copy test of 10,000 copies was conducted under these conditions, copies of sieve quality with high image density were obtained. Further, when the condition of the surface of the photoreceptor was observed after the completion of a copy test of 10,000 copies, slight scratches caused by the blade were observed, but no toner adhesion was observed.

On the other hand, except for removing the zinc stearate cleaning aid block, a copy test was started under the same conditions, and after 2,000 copies, black dot-like spots that appeared to be toner adhesion to the photoreceptor began to appear on the image. After 3,000 copies, the entire image became covered with black dots of about 0.5 in size, significantly degrading the image quality.At this point, when the surface of the photoreceptor was observed, black dots, which appeared to be toner adhesion, were observed. It was done.

(Experiment 2) A copy test was conducted in the same manner as in Experiment 1 except that the cleaning aid in Experiment 1, zinc stearate, was changed to magnesium stearate, and the same results as Experiment 1 were obtained. .

〔Effect of the invention〕

The cleaning aid application device according to the present invention can avoid an increase in the size of a copying machine and an accompanying increase in cost due to the provision of such a device.

Furthermore, as explained in this embodiment, by disposing a magnet on the cleaning aid support plate to which the cleaning aid block is attached, the magnetic toner located at the position of the cleaning aid block is violently agitated and causes spikes. , the cleaning aid is effectively scraped off. In addition, as mentioned above, the development of dead weight is prevented due to the uniformity of the developer, and the cleaning aid application device is easy to set up, yet highly effective and maintains stable cleaning performance. .

Further, although the bias power supply 9 is shown in FIG. 1, an appropriate method such as grounding may be used depending on the developer used.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of a cleaning aid coating device and a developing device of the present invention, and FIG. 2 shows a sectional view of main parts of an embodiment of the present invention.・Developing device 3...Non-magnetic sleeve 4...Magnet, roller 5
... Rotation e 6 ... Current agent reservoir 7 ... Ear standing regulation plate 8 ... Cleaning aid support plate 8a, 81m, 82a, 83a, 84a, 85a, 86
a---Magnet 11...Development area T...Magnetic toner C...Cleaning aid agent Yoshimi Kuwahara (C) (d) )20 (f)

Claims (1)

[Scope of Claims] 1. A magnet roll inside, a non-magnetic sleeve covering the outer periphery of the magnet roll, and a back-up control for regulating the amount of magnetic developer adhered to and conveyed onto the non-magnetic sleeve. A developing device having a plate is characterized in that a cleaning aid is provided between the bristling regulating plate and the developing area, between the sleeve and along the sleeve curve, facing the sleeve curve. Cleaning aid application device. 2. The cleaning aid application device according to claim 1, wherein a magnet is disposed on at least a portion of the support plate that supports the cleaning aid. 3. The cleaning aid application device according to claim 1 or 2, wherein the cleaning aid is a fatty acid metal salt. 4. Cleaning aid coating &6' according to claim 1 or 8g2, wherein the cleaning aid is zinc stearate.