JP2594930Y2 - Developing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device, and more particularly to a developing device in which a non-magnetic one-component developer carried on a developer carrier is regulated by a regulating member abutting on the developer carrier. The present invention relates to a developing device for forming a thin layer of a developer.

[0002]

2. Description of the Related Art An example of a conventional developing apparatus of this kind is disclosed in Japanese Patent Publication No. 63-1558, which was filed on April 5, 1988.
No. 0. In this prior art, a uniform and thin developer layer is formed by using a regulating member in which a soft elastic body is formed on the surface of a thin metal plate having a spring property.

Another example of this kind of conventional developing device is disclosed in Japanese Patent Application Laid-Open No. Hei 1-1, published May 31, 1989.
38577. This conventional technology prevents the wear of the regulating member by coating the surface of the regulating member with a ceramic containing at least one atom of titanium and tungsten, and deteriorates an image such as a character fog or a blur due to insufficient charging of the toner. To prevent contamination inside the main body due to scattered toner,
Further, the drive torque of the developing device is reduced to extend the life of the regulating member.

[0004]

[Problem to be solved by the present invention]
The developing device disclosed in Japanese Patent No. 15580 has a problem that it is difficult to form a uniform and thin developer layer over a long period of time because the soft elastic body is worn by use. Further, in the developing device disclosed in Japanese Patent Application Laid-Open No. 1-138577, since the regulating member must be coated with ceramics, there is a problem that manufacturing is difficult and costs are increased.

Therefore, a main object of the present invention is to provide a developing device which is inexpensive and can form a uniform and thin developer layer over a long period of time.

[0006]

According to the present invention, a non-magnetic one-component developer carried on a developer carrier is regulated by a regulating member abutting on the developer carrier, thereby regulating the developer. In a developing device for forming a thin layer, a film member that adheres so as to sandwich the regulating member, and a toner box that stores the developer, the film member protruding from both ends in the width direction of the regulating member, A developing device is housed between a developer carrier and the toner box.

[0007]

The frictional force between the regulating member and, for example, the developing roller is increased by bonding the thin layer tape to, for example, the tip of the regulating member. Therefore, even if the pressing force of the regulating member is small, the tip of the regulating member is pulled by the developing roller by the rotation of the developing roller, and the leading end of the regulating member contacts the developing roller with a sufficient pressing force. Further, by adhering the thin tape, the surface smoothness of the tip of the regulating member is increased.

[0008]

According to the present invention, the film members protruding from both ends of the regulating member in the width direction are stored between the developer carrier and the toner box, so that the developing member can be developed from the side of the developer carrier. Agents can be prevented from falling off. Also, since the film member is bonded so as to sandwich the regulating member,
Wear of the regulating member can be prevented. Further, since it is only necessary to bond the film member, the cost can be reduced.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
Includes a toner box 12 in which a non-magnetic one-component toner 14 is stored. A developing roller 16 that rotates in the direction of arrow A is provided at the opening end of the toner box 12, and a supply roller 18 that rotates in the direction of arrow B is provided adjacent to the right side of the developing roller 16. Note that predetermined biases 20 and 22 are applied to the developing roller 16 and the supply roller 18, respectively. A blade support member 24 is provided in the toner box 12. One end of a metal blade 26 is mounted on the blade support member 24, and the other end is pressed against the developing roller 16. Therefore, the supply roller 18
Is rotated, the toner 14 is frictionally charged to the developing roller 16, and the frictionally charged toner 14 is further regulated by the blade 26, thereby forming a thin toner layer. Thereafter, the toner 14 regulated by the blade 26 is supplied to the photosensitive drum 28 adjacent to the left side of the developing roller 16 and grounded, and is developed.

As can be seen from FIGS. 2 and 3, a thin layer tape 30 made of, for example, cellophane and having a thickness of s is adhered to the other end of the blade 26 having a thickness of t. At this time, the thin tape 30 is attached to the blade 2 from the other end of the blade 26.
The thin tapes 30 are bonded to each other at both ends in the width direction of the blade 26. The thin layer tape 30 protruding from both ends in the width direction of the blade 26 is stored between the toner box 12 and the developing roller 16.

FIG. 4 is a graph showing the relationship between the thickness s of the thin tape 30 and the image quality. Thus, if the thickness s of the thin tape 30 is set in the range of 0.05 mm to 0.25 mm, the thin tape 30 does not peel off even after printing 7000 sheets exceeding the life of the toner box 12. It can be seen that a perfect image is formed. In this experiment, the thickness t of the blade 26 was set to 0.3 mm.

Further, as can be seen from FIG. 5, the variation in the density of the formed image is considerably improved by mounting the thin tape 30 as compared with the case where the thin tape 30 is not mounted. You can see that. Further, by laminating the thin tape 30 at both ends in the width direction of the blade 26, the thin tape 30 does not peel off from both ends in the width direction of the blade 26. It was confirmed by experiments not shown that the toner 14 could be prevented from spilling off from the side surface of the developing roller 16 by being stored between the developing rollers 16.

As can be seen from these experiments, according to this embodiment, a uniform thin toner layer can be formed over a long period of time by mounting the thin tape 30. Further, since the thin layer tape 30 is adhered, the processing of burrs generated at the time of manufacturing the blade 26 becomes unnecessary, so that the manufacturing cost can be reduced. Further, even when the cold toner 14 is used in winter or the like, no dew condensation occurs on the other end of the blade 26, so that the solidification of the toner 14 can be prevented.

Although this embodiment has been described using a thin layer tape made of cellophane, the present invention is not limited to this, and a similar effect can be obtained by using a thin layer tape made of polyurethane, silicon, polyimide, or the like. Of course you can.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a part of the embodiment in FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a graph showing a relationship between a tape thickness and an image quality level.

FIG. 5 is a graph showing variations in image density.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Developing apparatus 16 ... Developing roller 18 ... Supply roller 26 ... Blade 30 ... Thin layer tape

──────────────────────────────────────────────────続 き Continued on the front page (72) Takeshi Uchiyama 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Masahiko Hayashi 2-18-18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-63-202771 (JP, A) JP-A-5-6083 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03G 15 / 08

Claims (1)

(57) [Scope of request for utility model registration] A developing device for forming a thin layer of the developer by regulating a non-magnetic one-component developer carried on the developer carrier by a regulating member in contact with the developer carrier. A film member that adheres so as to sandwich the regulating member, and a toner box that stores the developer, wherein the film member protruding from both ends in the width direction of the regulating member includes the developer carrier and the toner box. And a developing device.