JP2743676B2 - Developing device for electrophotographic equipment - 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 for various electrophotographic apparatuses . 2. Description of the Related Art Recently, an electrophotographic apparatus such as a laser printer or a copying machine has been widely used in offices because it can print various kinds of information at a high speed and has low noise. It is necessary to keep the toner concentration of the stored developer constant.

In the developing device, a stirring and conveying roller for uniformly mixing the toner and the carrier supplied from the toner supply mechanism to form a developer is provided in parallel with the magnet roller. Since the replenished toner contains a lump of toner (hereinafter simply referred to as “raw toner”), it is necessary to sufficiently stir the raw toner to pulverize the raw toner. In addition, there is a demand for a new electrophotographic developing device capable of sufficiently pulverizing raw toner.

[0003]

2. Description of the Related Art As shown in FIG. 5 (b), a developing device of an electrophotographic apparatus widely used in the prior art is a case 1-1 of a developing device main body.
As shown in FIG. 5A , the side wall 1-1a of the case 1-1 has a height slightly protruding from a draft surface of the developer 8 supplied to the case 1-1.
The partition plate 2 is erected so that the developer 8 moves between the first and second screws 3 in parallel with the partition plate 2 so that the partition plate 2 is interposed therebetween. The first and second screws 3 are rotatably supported on the side wall 1-1a, and are rotated in opposite directions by a driving source (not shown). A stirring mechanism is formed so that the agent 8 is circulated in the direction of the arrow while stirring.

As shown in FIG. 5 (b), a plurality of toner stirring units 8a for stirring the replenished toner 8a by dropping from a toner supply mechanism 7 provided upright on one side of a case 1-1. An agitating roller 4 shorter than the first screw 3 provided with a plurality of blades radially from an axis and an Mg roller 5 for supplying the developer 8 to the photosensitive drum are each provided with a shaft having a draft surface of the developer 8. The scraping plate 6 which is provided in parallel with the first and second screws 3 so as to have a height substantially equal to the outer periphery of the Mg roller 5 and is in contact with the upper portion of the outer peripheral surface of the Mg roller 5 is fixed to the second screw. It is arranged diagonally toward 3.

Then, when the developing device having the above configuration is driven,
As shown in FIG. 5A, the toner replenished from the toner supply mechanism 7 is agitated by the agitating roller 4 and supplied to the first screw 3. The toner replenished by the first rotation is the While being uniformly mixed with the developer 8 from the second screw 3, the developer 8 is conveyed in the direction of the arrow, and the developer 8 is transferred to the second screw 3 from between the partition plate 2 and one of the side walls 1-1a. The developer 8 in which the toner and the carrier are mixed at a fixed ratio can be supplied to the Mg roller 5 by being conveyed in the direction of the arrow opposite to the conveyance direction of the one screw 3.

As another conventional example, as shown in FIG. 6 (a), a plurality of blades for stirring the toner replenished from the toner supply unit 1-1b are disposed at the center of the case 1'-1. a stirring roller 4 'provided in the direction, and a screw 3 for conveying the developer in the axial direction by the spiral blade in parallel supported at regular intervals, the stirring roller 4 as shown in FIG. 6 (b) For example, a gap between the developer 8 and the screw 3 can be formed at a height protruding from the upper outer peripheral surface of the stirring roller 4 'and between the side walls 1'-1a of the case 1'-1. Partition plate 2 is provided vertically.

[0007] A Mg roller 5 for supplying the developer 8 to a photosensitive drum (not shown) is provided above the screw 3 in parallel with a shaft, and the scraper plate is brought into contact with the upper portion of the outer peripheral surface of the Mg roller 5. 6 is disposed obliquely toward the stirring roller 4 ', and a toner supply roller is provided on the stirring roller 4' side. The stirring roller 4 'and the screw 3 are opposed to each other by a driving source (not shown). by rotating in the direction, the developer 8 as shown in FIG. 6 (a) is configured to be supplied to the Mg roller 5 orbiting with stirring as the boundary the partition plate 2.

[0008]

The problem with the conventional developing device described above is that the toner supplied to the case 1-1 from the toner supply mechanism or the toner replenishing roller is a solidified lump of the toner itself. Since the raw toner is mixed and the specific gravity of the raw toner is lower than that of the developer 8 in which the toner and the carrier are mixed, as shown in FIG. In the structure in which the toner 8a is dropped from the replenishing roller 4 to the stirring roller 4, the lump of the replenished toner 8a scatters on the adjacent first screw 3 and is formed on the upper surface of the developer 8 orbiting the partition plate 2. There is a problem in that the photographic printing is suspended and is supplied to the Mg roller 5 by the conveyance of the second screw 3 to cause stains in photographic printing.

Further, as shown in FIG.
In a structure in which a stirring roller 4 ′ for stirring the replenished toner and a screw 3 for transporting the developer in the axial direction are supported in parallel at a fixed interval, the mass of the replenished toner is supplied to the adjacent screw 3. The photo print has been contaminated and contaminated.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a new electrophotographic apparatus capable of preventing contamination of photographic prints by reliably stirring and pulverizing a replenished toner mass and supplying it to a magnet roller. The purpose of the present invention is to provide a developing device.

[0011]

According to the present invention, as shown in FIG. 1, two screws 13 whose both ends are formed into a conical shape with a constant apex angle are formed so that corner portions 11-1b correspond to the both ends. with parallel and axially supported on the case 11-1 is molded into a shape, the upper
Radius direction at equal divided angles serial cone perpendicular equal triangular blades 14a
A conical transfer vehicle 14, which is a forced transfer means protruding in a radial direction, is disposed in a triangular space formed at both ends of the screw 13 so as to rotate in conjunction with the screw.
The transfer vehicle 14 and the screw 13
The Mg roller 5 and the stirring roller 4 are disposed in parallel with the screw 13, and the toner supply mechanism 7 is fixed on the stirring roller 4. Transfer car 14 rotating in the opposite direction
The Mg roller 5 and the stirring roller 4 are also configured to work together.

[0012]

According to the present invention, two screws 13 for transporting the developer 8 in opposite directions are formed in a conical shape at both ends, and are laid horizontally in parallel via the partition plate 2.
Since the corner portion 11-1b of 11-1 is formed in a shape corresponding to the both end portions, the developer 8 moved to the end portion in the transport direction is transferred from one screw 13 to the other screw adjacent thereto.
The force that flows toward -13 is generated.

When the conical transfer vehicle 14 which is provided in the triangular space formed at both ends of the screw 13 is rotated in response to the flow, the developer 8 replenished from the toner supply mechanism 7 and transported is supplied. floating mass of the toner on the top surface is stirred by the transfer wheel 14, it is crushed in the interior of the developer 8
It is possible to prevent contamination of the photographic printing because the developer 8 which is uniformly mixed because Re that can provide to the Mg roller 5.

[0014]

BRIEF DESCRIPTION Hereinafter FIGS an embodiment of the present invention in detail. FIG. 1 is a schematic diagram showing a developing device of an electrophotographic apparatus according to a first embodiment, FIG. 2 is a schematic diagram showing a developing device of a second embodiment, and FIG. 3 is a schematic diagram showing a developing device of a third embodiment. 4
Shows a schematic diagram illustrating a developing device of the fourth embodiment, in which the same members as those in FIGS . 5 and 6 are denoted by the same reference numerals .

The developing device of the electrophotographic apparatus according to the first embodiment using the above-mentioned members has a developer 8 as shown in FIG.
The two screws 13 having a fixed, for example, a conical blade 13a at an apex angle of 60 ° are provided at both ends of the blade formed in a spiral shape. Are supported in parallel to both side walls 11-1a of a case 11-1 formed in a shape corresponding to the shape of both ends of the case 11-1.
A partition plate 2 having a length capable of forming an interval in which the developer 8 can be transported with respect to -1a is vertically provided between the two screws 13.

Both ends of the two screws 13 and the side wall 11
-1a and a triangular space formed by the end face of the partition plate 2, a plurality of triangular blades 14a are radially planted at equal division angles in a conical transfer vehicle 14 having the same apex angle as the end apex of the screw 13. Are supported in parallel with each other , and the stirring roller 4 is
And the Mg roller 5 are rotatably arranged, respectively, as shown in FIG.
As shown in (b), it faces the stirring roller 4 on the upper part of the case 11-1.
The toner supply mechanism 7 is fixed at a position where the toner is supplied .

Further, by rotating the two screws 13 in directions opposite to each other as indicated by arrows and rotating the transfer wheel 14 in conjunction with each other, the developer 8 is rotated around the partition plate 2 while stirring. The Mg roller 5 .

As shown in FIG. 2, the developing device of the second embodiment has two screws 3 via a partition plate 2 and a stirring roller 4 and a Mg roller 5 on the outside of the screws 3 respectively.
The toner supply mechanism 7 is attached to the upper lid 1-2 of the case 1-1 that supports the
A hook-shaped shielding plate 21 extending from the inner surface of the upper lid 1-2 to the draft surface of the developer 8 housed in the case 1-1 is suspended so as to isolate the upper space of the stirring roller 4 suspended below the lower end of the housing. Thus, the toner replenished by the toner supply mechanism 7 is configured to fall only on the upper portion of the stirring roller 4.

In the developing device of the third embodiment, as shown in FIG. 3 (a), two screws 3 and Mg roller 5 adjacent to each other between both side walls 1-1a of case 1-1 are laid in parallel. Along with the M
A toner supply unit 1-1b is provided on the opposite side of the g roller 5 . Further
A toner moving portion is formed at a fixed interval from the side walls 1-1a.
Partition plate 2 between the two screws 3
A regulating plate 31 is provided, which extends vertically from the bottom surface of 1-1 and covers an upper open portion of the screw 3 for stirring and conveying the toner replenished in the toner replenishing section 1-1b on the developer conveying direction side .

The regulating plate 31 is provided with a partition as shown in FIG.
Connected to the upper end of the screw plate 2 and the lower surface is above the screw 3
Slightly larger than the radius of screw 3 so as to be close to the edge
By molding into a semi-cylindrical surface with a large radius , the flow of the toner lump floating in the upper layer of the developer 8 to be conveyed is stopped , and
Stirring constitutes a so that be ground.

As shown in FIG. 3 (a), the developing device of the fourth embodiment has two screws 3 and a Mg roller 5 laid parallel to a case 1-1 of a developing device main body having a toner supply section 1-1b. A partition plate 2 that is suspended and suspended between the two screws 3;
As shown in FIG. 4, the side wall 1-1a and the upper lid 1-2 of the case 1-1 are provided.
A square hole 42a is provided at the lower part of both ends of the flat plate formed to have a size in contact with the inner surface so that the developer conveyed from one screw 3 can move to the other screw 3. By rotating the developer, the developer passes through the hole 42a and goes around the partition plate 42.

[0022]

As is apparent from the above description, according to the present invention, the raw toner replenished from the toner replenishing section is completely pulverized with a very simple structure, so that the toner is uniformly mixed with the Mg roller. It is possible to provide a developing device of an electrophotographic apparatus which has an advantage that a developer is supplied to prevent stains in photographic printing, etc., and is expected to be significantly economical and to have an effect of improving reliability.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a developing device of an electrophotographic apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a developing device according to a second embodiment.

FIG. 3 is a schematic view illustrating a developing device according to a third embodiment.

FIG. 4 is a schematic view illustrating a developing device according to a fourth embodiment.

FIG. 5 is a schematic view showing a conventional developing device.

FIG. 6 is a schematic diagram showing another conventional example.

[Explanation of symbols]

 1-1 and 11-1 are cases, 1-1a and 11-1a are side walls, 1-1b is a toner supply section, 1-2 is a top lid, 2, 42, 52, and 62 are partition plates, and 3 and 13 are screws 13a, 14a are blades, 4 is a stirring roller, 5 is a Mg roller, 6 is a scraping plate, 7 is a toner supply mechanism, 7-1 is a hopper, 8 is developer, 8a is toner, and 11-1b is a corner portion. Is a transfer vehicle, 21 is a shielding plate, 31 is a regulating plate, 42a is a hole, 52a is a slit, 62a is a through hole,

Continued on the front page (72) Inventor Atsushi Fujisawa 35th Saho, Kato-gun, Hyogo (No address) Inside Fujitsu Peripheral Machinery Co., Ltd. (72) Inventor Yumi Sugiura 35th Saho, Kato-gun, Hyogo (No address) ) Inside Fujitsu Peripheral Machinery Co., Ltd. (72) Inventor Kazuyoshi Sazawa No. 35, Saho, Shato-cho, Kato-gun, Hyogo (No address) Inside Fujitsu Peripheral Machinery Co., Ltd. (56) References JP-A-2-64583 (JP, A JP-A-62-297873 (JP, A) JP-A-1-123270 (JP, A) JP-A 64-15259 (JP, U) JP-A-3-98459 (JP, U) JP-A 63-297 107448 (JP, U)

Claims (4)

(57) [Claims] A toner supply mechanism is provided, and a partition plate is vertically provided at a central portion of a bottom surface of a case for supplying a developer to a magnet roller, and is provided between two screws for transporting the developer in an axial direction. In a stirring mechanism configured so that the partition plate is interposed and supported in parallel so that the developer is circulated around the partition plate by rotating the screw, development is performed between the two screws. In the route that the agent travels,
Transfer the developer from one screw to the other
As control transfer, constant both ends of the two screws
Apex angle of the cone and equal to the cone apex angle
Transfer with triangular blades protruding radially at equal angles in the radial direction
Parallel to each other so that the transport rotates with the screw
A developing device for an electrophotographic apparatus, wherein a forced transfer means pivotally supported by the device is provided. 2. The triangular blade of the transfer vehicle has a shape that is curved in a direction opposite to the rotation direction as the distance from the axis increases.
2. The developing device for an electrophotographic apparatus according to claim 1, wherein: 3. The triangular blade of the transfer vehicle has a lead angle .
Developing device of an electrophotographic apparatus according to claim 1, characterized in that helical with. 4. A toner supply mechanism is provided to remove developer.
Partition at the center of the bottom of the case to be supplied to the gnet roller
Plate, and two screws for transporting the developer in the axial direction.
Supported in parallel so that the partition plate is interposed between the crowns
Then, by rotating the screw, the partition
A stirring mechanism configured to circulate the developer around the plate.
And connected to the upper end of the partition plate to open the screw.
A developing device for an electrophotographic apparatus, comprising: a regulating plate that covers a portion in close proximity and stops conveyance of a toner mass floating in an upper layer of the developer.