JPS6080874A - Non-magnetic one-component developing device - Google Patents

Abstract

PURPOSE:To keep a member for regulating a toner layer damage-free for a long period of time and to prevent toner filming on the surface of the regulating member and a carrying body on which the uniform non-magnetic one-component toner layer is formed by specifying the coefft. of friction of said carrying body at a prescribed value. CONSTITUTION:A non-magnetic one-component toner layer controlled to a uniform layer thickness by a regulating member 34 is formed on the surface of a carrying body 31. If the body 31 is formed to have the coefft. of friction ranging 0.02-0.3, the coefft. of friction between the body 31 and the member 34 decreases and the member 1 is kept damage-free for a long period of time. Less friction heat is generated on account of the decreased coefft. of friction and the carrying body and regulating member are prevented from having the toner film which is the cause for uneven development.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a non-magnetic component developing device for developing with a non-magnetic component toner.

Prior Art As shown in FIG. 1, a regulating member 1 consisting of an elastic roller is provided.
is pressed against a metal cylindrical carrier 2.

While supplying the toner 3 to the nip between the regulating member 1 and the carrier 2, the carrier 2 is rotated in the direction of the arrow, and the regulating member 1 is rotated in the direction of the arrow (in the opposite direction to the carrier 2) to the nip. By rubbing the toner 3, a thin and uniform toner layer 3' is formed on the carrier 2 while being triboelectrically charged, and this toner layer 3' is sent to the holder 4 and a developing bias is applied to the carrier 2. A non-magnetic component developing device is known in which the toner 3 is attached to the electrostatic latent image 5 using the electrostatic latent image 5 to develop the image.

The regulating member 1 has a shape in which a rubber skin layer 7 is wrapped around the surface of a foam 6 in order to reduce the pressure contact force with the carrier 2. The regulating member 1 is rotated in the opposite direction to the carrier 2. A large torque is required to do so.

Therefore, depending on long-term use, the rubber skin layer 7 may be damaged and the toner 3 may be transferred to the regulating member 1 due to the generation of frictional heat.
This causes poorly charged toner to form on the surface of the carrier 2 and cause fogging. Therefore, replacing the regulating member 1 early will prevent clear images from being obtained for a long period of time. There is a problem with not having it.

Since the pick and conventional carrier 1 are made of metal materials such as stainless steel and aluminum, their surface roughness is extremely rough due to processing reasons, and the coefficient of friction is extremely large. If the surface of the regulating member 1 is damaged due to sliding contact with the regulating member 1, a large amount of frictional heat is generated, resulting in the above-mentioned problem.

OBJECTS OF THE INVENTION It is an object of the invention to prevent damage to a regulating member even after long-term use, and to prevent toner filming from occurring on the surface of the regulating member or carrier.

Constituent structure of the invention The friction coefficient of the carrier is in the range of 0.02 to 0.3, and the frictional resistance between the carrier and the regulating member is lowered.

Embodiment In the non-magnetic component developing device shown in FIG.
The coefficient of friction is in the range of 0.02 to 0.3.

Here, in order to set the friction coefficient of the carrier 2 in the range of 0.02 to 0.3, the surface of the carrier 2 should be coated with molybdenum disulfide, graphite, tungsten disulfide, poron nitride, fluorocarbon, stearyl, etc. It may be treated with a lubricant such as y-acid or stearamide.

For example, as shown in Figure 2, the surface of an aluminum cylinder 21 is sandblasted to a surface roughness of 2μ.
Then, a lubricant 22 of molybdenum disulfide is embedded (injected) to form a carrier 2.

However, when using the carrier 2 manufactured in this manner and the regulating member 1 made of urethane rubber.

The initial coefficient of friction is about 0.3, but with long-term use, the molybdenum disulfide peels off and the coefficient of friction gradually increases, resulting in the above-mentioned drawbacks. I don't like that one.

Therefore, in the present invention, the supporting body is integrally molded using a resin molding material in which the above-mentioned lubricant is dispersed, and the coefficient of friction is reduced to 0.
The range was 0.02 to 0.3.

Examples of resins include thermosetting resins such as phenol resins, area resins, and melamine resins, and thermoplastic resins such as polystyrene resins and acrylic resins. coefficient 0.02
-0.3 range.

For example, by using graphite as a lubricant and dispersing it in a phenol resin in an amount of 1c20 to 60M, the coefficient of friction can be set in the range of 0.02 to 0.3.

Furthermore, if the surface roughness of the carrier is increased, the coefficient of friction can be reduced, but if the surface roughness is 5 μm or more, toner filming tends to occur.

A door size of about 1μ is desirable.

From the above, when the surface roughness is 1 μm, the friction coefficient is o,
o g supports are preferred.

Note that if the friction coefficient is less than αo2, sufficient friction between the regulating member and the carrier will not be obtained, and a uniform layer of toner will not be obtained, and if it is greater than 0.3, the conventional drawbacks cannot be solved. The friction coefficient of the body was set in the range of 0.02 to 0.3.

As described above, when the friction coefficient of the carrier 2 is set in the range of 002 to 0.3, the friction coefficient between the carrier 2 and the regulating member 1 becomes small, the regulating member 1 is not damaged, and the friction Since less heat is generated, the toner 3 does not film on the regulating member 1 or the carrier 2, and an image without fogging can be obtained.

Fig. 3 shows a specific example, in which the supporting body 31 is made of a resin molded material with a friction coefficient of 0.05 by dispersing 30 to 50% graphite in a phenolic resin.
Cylindrical] shape.

A hopper 32 is provided above the carrier 31, in which a toner 33 of non-magnetic component is placed.

The regulating member 34 is a roll of 256 mm made of urethane foam coated with conductive urethane (specific resistance 10 gon), and 80 F7/st in the opposite direction to the carrier 31.
It is rotating at a circumferential speed of c.

The toner 33 is formed on the carrier 31 in a thin layer of 20 to 30 μm due to the sliding friction between the regulating member 34 and the carrier 31, and is negatively charged (approximately -15 μc/, qr) due to the friction.

On the other hand, due to the rotation of the carrier 31, the toner 33 is sent to the holder 36 which holds the electrostatic latent image 35 on its surface.
5 and finish the development.

Note that the carrier 31 is supplied with 300V DC and 1600V AC.
pp, 1000 Hz multiplied by M is applied as a developing bias 37 to prevent toner from adhering to non-image areas and to provide an appropriate edge effect.

In the non-magnetic component developing device as described above, the carrier 31
Since the coefficient of friction of
The regulating member 34 was not damaged even when the developing operation) was carried out, the generation of frictional heat was extremely small, and no filming of the toner 33 on the regulating member 34 and the surface of the carrier 31 occurred.

Also, in the non-magnetic component developing device mentioned in @.

When using the carrier 3I, which is made of stainless steel and has a coefficient of friction of 0.6 as in the past, toner fills the regulating member 34 and the surface of the carrier 31 after approximately 1,000 copying operations (developing operations). After approximately 5,000 copying operations (developing operations), a small damaged portion was generated on the surface of the regulating member 34.

Effects of the Invention Since the regulating member is not damaged even after long-term use, there is no need to replace the regulating member, and the cost can be reduced.

In addition, since frictional heat is not generated due to the sliding contact between the regulating member and the carrier, toner does not form on the regulating member or carrier surface even after long-term use, and the toner remains clear for a long time. An image is obtained.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a schematic diagram of a non-magnetic component developing device, FIG. 2 is a sectional view of a carrier, and FIG. 3 is a diagram of a specific example. 1.34 is a regulating member, 2.31 is a carrier, 3.33 is toner, 4 and 36 are holders, and 5.35 is an electrostatic latent image. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] A non-magnetic component toner is supplied to the surface of a carrier. A thin, uniform layer of toner is formed on the regulating member. A non-magnetic component developing device f that feeds this toner layer to a holder that holds an electrostatic latent image on one surface, and applies a developing bias to the holder so that the toner adheres to the electrostatic latent image and develops it.
In each case, the friction coefficient of the carrier is 0.02 to 0,
A non-magnetic-component developing device whose percentage is within the range of 3.