JPS61201280A - Developing device for electrostatic latent image - Google Patents

Abstract

PURPOSE:To perform sufficiently agitation in axial directions of a developing sleeve and the electrostatic charging of toner by providing projections for developer agitation in an empty chamber provided while sectioned from a toner hopper above the developing sleeve. CONSTITUTION:The empty chamber 14 which is sectioned from the toner hopper 13 is provided above the developing sleeve 10, and many projections 17 for developer agitation which are in a shape of a quadrangular prism are provided at the side of the empty chamber 14 of a nap height control plate 16. A developer which is conveyed under the control by the nap height control plate 16 is moved up along the nap height control plate 16 with the pressure of a developer conveyed successively and collapses when reaching a ceiling part 12a. Then, the falling developer collides against a developer scattered over a repulsive magnetic pole O and is mixed. Namely, the developer is charged in direction by projections 17 and energized, specially, in an axial direction of the developing sleeve 17, so that the developer is agitated sufficiently not only vertically, but also axially.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic latent image developing device used in a copying process such as electrophotography.

This is an electrostatic latent image developing method that has already been put into practical use.9 and 1. ,,! A 52-component development method that uses a heavy body consisting of a mixture of I17 and the menacing dog Yaria, and a 52-component development method that uses a powder developer that smears magnetic toner T1.

The law can be followed. By the way, the conventional two-component development method requires a large ρ bucket 8-bucket roller, etc.21
．． 1.・In recent years, drops, double 〒, -℃, small, type A1. Not suitable for lower prices. .

1 Te, method 1.1, Seikaitei image method is 2-component development method, which Taiki, power? 1 5-way mixing, stirring means (no need for toner,
While the replenishment of toner does not require strict control, the toner requires conductivity during development and insulation during transfer, which are contradictory conditions: 1
- mouth , -8□difficulty] enemy・There is an enemy・1 Currently・Copy';'q , -tr,,,
w,,,, 1, 71 load is applied, 1, transfer characteristics are good, high resistance, all... 7.7Tg
F male, 1. - Efforts are being made to improve development characteristics.

,i,;5 One countermeasure for this type 1 is that: ・Motoyama and Akihito have already carried out the following: ”-4'i j=Both □ The dead toner and magnetic carrier on the outer peripheral surface. A magnetic developer consisting of a mixture of

-: A developing agent 1j-bun 1') for 'gate', a height regulating plate (3) provided on the upstream side of the developing area (A) in the developer i direction [arrow (b)], A front regulation plate (4) provided on the upstream side of this height regulation plate (3) to face the outer circumferential surface of the developing sleeve (1), a mat, a height regulation plate (3), and a front regulation return (4).・A vacant chamber (5) formed to open toward the outer peripheral surface of the developing sleeve (1) and a toner replenishing section (6) installed on the upstream side of the front regulating plate (4). A developing device equipped with
(See No. 633).

In this developing device, the arrow (
b) Rotation in the direction or/and arrow (a) of the magnetic roller (2)
Based on the rotation in the ) direction, toner is replenished to the magnetic carrier previously supplied on the outer peripheral surface of the developing sleeve (1) to prepare a magnetic developer, and the magnetic developer is circulated and conveyed in the arrow (b) ^□ direction, In the development area (A), arrow (c) direction 2
, the electrostatic latent image carried on the surface of the photosensitive drum (9) rotating in the 1° direction is developed. After development, the magnetic developer whose density has decreased passes through a five-blind scraper (8) (not necessarily required) and is transferred to the toner replenishing section (6).
□The toner stored in the toner hopper (7) is replenished. , in the second developing device, -1 due to the existence of empty chamber (5).
,' Therefore, the magnetic developer conveyed to the development area (jA) temporarily stays in the empty chamber (5) and is mixed and stirred, so that the magnetic carrier is diffused into the toner hopper (7). □ is protected and placed in the development area (A))
And always -.

A constant toner density can be maintained. However, due to the high temperature and high humidity environmental conditions, the mixing and stirring action of the magnetic developer within the cavity (5) is not necessarily sufficient, especially in the axial direction of the developing sleeve (1). The agitation properties are poor, and there are problems in that uneven development and toner fog occur due to insufficient agitation and insufficient charging. Moreover, toner agglomeration is likely to occur, and the agglomerated toner is exposed to the height regulating plate (3).
) 1, the developer transportation was blocked in that ordinance, and linear development unevenness occurred.
□The electrostatic latent image developing wrinkles according to the present invention are the same as those already proposed by Ganto Motokawa. This is an improved developing device, and the developing sleeve is different from the toner hopper.

A fence was placed in the empty room cut out for stirring, 7)'s'4
The eel 1 is connected to the outer periphery (through the three-pronged magnetization).
A m ``I'' □Fix the ゛艷-' to the gate, □゛Kami゛Revised development history, j2°Ta summer''φ゛゛□Force (ra') Rotating part in the same direction in the ray image area' It is movable and features a "sacred image" based on the rotation of the three-seventh,
'.1,'-4~ The electrostatic latent image is developed in the development area. In the cavity provided on the upstream side of the development area, the developer is scattered in two directions by the repelling magnetic pole of the magnetic roller, and then it immediately collides with the developer stirring protrusion and is thoroughly mixed and stirred. The agitation in the axial direction of the image strip nib and the toner band mhi-1-min are carried out, and the toner condensation ==='a'
It is naturally prevented.

What do you like? □ ・ [First embodiment, see Figures 1 to 3] Figure 1 shows an example of the implementation of the 'm'g' electrostatic latent image line-of-sight device on a vehicle. A 11' sleeve (10) with a 1 liter capacity inside is installed at the bottom of the existing moat agent container (12). 9) The surfaces of the plates are placed opposite each other, -
Rokusuka E'pu (i pickled in the direction of the point-ho □ Tsubame (1'3)
) is 145 plus i', and the magnetic development net is =S)Iil-jb<"'i '6
"jme" failure (6) Follow the rotation in the wrong direction.
Circulate the t'4 circumferential rod □ in the same direction as C-Hyosa i', t.
i'QJ feeling "M"r"'ym<:'9)' is a well-known method in which a photoreceptor layer is formed on the surface, and in this example, the It is rotated at high speed in the direction of arrow (c), and a positive electrostatic latent image is formed before reaching the development area (A).The empty chamber (14) is a container (I2) made of a resin material. a ceiling portion (12a), a partition wall portion (+2b) inclined toward the toner hopper (13), a partition plate (15) inclined in the developer transport direction from the lower end of the partition wall portion (121+), and a ceiling portion (, 12,, the tip of a) is suspended from the height regulating plate (
16). The partition plate (15) regulates the amount of developer conveyed to the empty chamber (14), and is made of a non-magnetic material (for example, stainless steel). Hot height regulation plate (1
6) regulates the amount of developer conveyed from the empty chamber (I4) to the developing area (A), and is made of non-magnetic material (for example, stainless steel). A large number of protrusions (17) in the shape of a four-sided pyramid for stirring the developer are provided. Note that this protrusion (17) keeps the developer in the empty space (14).
It is for causing turbulence within the chamber, and may be a plate-shaped material as shown in FIG. 2b.

The developing sleeve (1,0,) is made of a conductive non-magnetic material (e.g.
.

(e.g. aluminum), , 3 , Q, Full
It is formed into a cylindrical body, has a gap of 45 mm from the surface of the photoreceptor drum (9) in the developing area (A), and rotates at a rotation speed of 54 rpm in the direction of the arrow (, b). Driven. Further, the outer circumferential surface is blasted to have a satin finish with a maximum roughness of 4 to 611I11, thereby improving developer transportability.

The magnetic roller (11) has magnetic poles (s, ), (s2), (N', ), (N2)+ extending in the axial direction on the outer circumference.
(Ni) is magnetized and fixed inside the developing sleeve (l l), the magnetic poles (Nl), (N,,) are adjacent to each other, and a repulsive magnetic pole (Q) is formed between them, and the magnetic flux The density has the characteristics shown in FIG. The magnetic pole (N1) is substantially opposed to the height regulating plate (16), the magnetic pole (N2) is substantially opposed to the partition plate (15), the repulsive magnetic pole (0) is opposed to the center of the empty chamber (14), and the magnetic pole ( SI) faces the development area (A).

On the other hand, a positive bias is applied to the photosensitive drum (9) and the developing sleeve (10) by a bias power source (19).

The magnetic developer has an average particle size of 30 μm and a resistance value of 10”Ω.
(, R bar, indica type magnetic carrier, average particle size 10
The mixture with the toner of ゜μm is formed.
.

By mixing and stirring, the band becomes negative polarity, and now the developing sleeve (1
The mm ratio on the outer circumferential surface of 0) is expressed as a weight ratio (w, t%): carrier, toner = 80 = 20. 1 1.2
.

When using this developing device in a black soil configuration, first fill the empty chamber (!, , /L) with a phosphorescent capacitor in the front width and a rear width.

After filling, move the developing sleeve (10) in the direction of arrow (b).

Rotate the magnetic carrier to the developing/imaging sleeve (1 o
) evenly spread over the outer circumferential surface of the. After the toner is collected, the hopper (13) is filled with the toner, and the developing sleeve (lj) is filled with the toner.
) and continue rotating in the direction of arrow (b).

In this case, the magnetic carrier on the developing sleeve (:10) is the magnetic carrier on the developing sleeve (lO) from the - pole (S2) to the magnetic pole (
Nt), the bottom of the hopper (13) takes in the %p snoring, and reaches the front of the partition plate (15). This, the iron, and the developer are placed between the partition plate (15) and the developing sleeve (10).
The ears are cut into a certain layer thickness using 5yW2, and the ears are cut into empty E! 4), and will be affected by the magnetic pole (Nl), (Ni) and the repulsive magnetic pole (,Q). The magnetic force of the magnetic pole (C1) is weak, and the magnetic pole (NO, (N,
) are the same polarity and repel each other, so there is a magnetic pole, (0) on (the transferred developer is not restrained by magnetic force, and magnetic % (H,
), (Nt) scatter upward along the magnetic field lines. 26
Most of the developer that scatters is repulsed by the magnetic force of the magnetic pole, (:koto,,), 4<,0>:
Deposit in minutes. Manoko,” the two of them (, this, scattered,
.

Ascend, the one on the image side: Small c;: (-1H cut, j, board (1
5) falls along.

Air affairs, (14) Return to ρ Itobe-no-Kiku, and set the repulsion magnetic pole (O9) again.
) splash on top. , 111. The developer deposited above the magnetic pole (N1)
・Magnetic force and the rotation of the IJ9-bu (lO); Hotaka Nori goes to the control plate (19), works, the pestle, and the developing sleeve (1,0)! The Guzo side on the first circumference (Yoho Takateru control board (,
1,6,) and current luster. In the gap with the sleeve (10) (
Cut the ears into uniform, thick layers.

The development area (A), 4, r, a, dt, photoreceptor drum ・, the surface of (9) is pre-formed with 1, 1, and the electrostatic layer, 1 drop. Fourth.

On the other hand, the height regulation plate <1. , C5), transportation is currently regulated.

The image side is conveyed 5 times in sequence, then moves upwards along the pressure of the developer, the height limit (l, 6.), j, and when it reaches the ceiling (12a). Fall down. So 1 te 1. At this time, it collides with and mixes with the developer scattered on the falling pattern impregnating developer material (0). In addition, the direction of the developer can be changed by the protrusion (17) protruding from the height regulating plate (16), and is particularly urged in the axial direction of the developing sleeve (10), so that the developer can move not only in the vertical direction but also in the axial direction. Mix and stir thoroughly in both directions.

During the operation of this developing device, the above-mentioned mixing and agitation is repeated in the empty chamber (14), and the toner is transported to the developing area (A') in a sufficiently charged state, and aggregation of toner occurs. Not at all. 'Even if toner agglomeration occurs,
When it is fed into the empty chamber (4), it is loosened by the above-mentioned mixing and stirring action.

In particular, due to the mixing and stirring action in the axial direction of the empty chamber (14),
Even if a large number of original images having four band-shaped solid black areas extending in the direction of development are copied, the developer containing toner is placed on the developing sleeve (10) corresponding to the black solid areas in the vacant chamber (14). are supplied one after another and are mixed and stirred with the developer whose toner concentration has decreased, so that a partial and rapid decrease in toner concentration does not occur.

In addition, in the above embodiment, according to the inventor's experiment, the developer in the empty chamber (14) circulates once every 3' to 5 seconds, and the developer in the center of the imaging sleeve (10) It was observed that the toner supplied over a width of 10 mm was spread across the entire width within the empty chamber (14) after 20 seconds.

Here, to explain the vacant room (14) in detail, the vacant room (14)
) requires a larger volume than the capacity of the developer entering through the partition plate gap and the developer exiting from the height regulation gap, and the partition plate gap and the height regulation gap are approximately equal, and the empty space (14 ) The amount of developer within ) is saturated and stable within a certain range. Specifically, the partition plate gap is 05 to 10 mm, and the Hotaka Kagami gap is (1,'2
It is 8-035 mm. The inner surface of the empty chamber (14) is polygonal so that the developer can be scattered effectively, and the joint between the height regulating plate (16) and the ceiling (12a) is designed to allow smooth movement of the developer. It is said to be a curved surface.

The partition plate (15゛) is installed at an angle of 10'o from the perpendicular direction to the developer conveyance direction -1 stream side □ centering on the axis of the developing sleeve (10). )
is installed with the same m+', ``bome angle gecko''.

-Low On the other hand, the magnetic pole (N1) is in the range of 2 to 5 degrees upstream from the position facing the height regulating plate (163, magnetic pole <N t'), and the magnetic pole (N1) is upstream from the escape position 'facing the partition plate (15). 10～! 5°
A range of is desirable. 1, that is, magnetic pole ('W';")ii
+″□ developer retention force allows the developer to be transferred to the height regulating plate (1
□ along d)
This is because the force <t't is small' if the device is located close to the upstream alignment of (). □Well, the magnetic pole (N,) is the partition plate' (15
) and slightly apart from each other, the force of the current moat agent at the partition plate gear joint is weakened to prevent clogging, and the magnetic pole ("6") is removed.

The main reason for locating it close to the partition plate (15) is to scatter the developer and agent upward as soon as they are carried into the empty chamber (14). ′ : [
2nd example, 4th page i light 5' □ 4th page is 2nd
To illustrate the implementation, a toner powder <i M ,> is installed on top of the porcelain <14) ci, and a toner "-supply stone-" is placed in the communicating part between the two, which has an "apparently shaped" cross section. La (1
At the first □ after installing 8), the other hinoki compositions are the same as in the first embodiment in Fig. 1. A minute concave □-1'2- convex is formed in □, and by rotating □ in the direction of arrow (d), one minute concave □ is formed in the media hopper (13).
A donor is supplied to empty room 04). The supplied toner falls onto the partition plate (15)' and the developing sleeve (1.
0) The kudzu is combined with the upper developer and mixed and stirred in the empty chamber (14) in the same manner as described in the first embodiment. □Tome-sama 13, if it is possible to supply the donor directly from the hopper (13) to the basement (1'4>), by controlling the rotation drive timing of the supply roller (18), the developing It becomes possible to strictly control the concentration of the toner, or to control it arbitrarily, and it is possible to quickly mix and stir the appropriate 'I'Q' toner. This method is particularly effective when preparing multiple manuscripts in which the black-and-white ratio differs dramatically from manuscript to manuscript.
・Effects of the invention: □ □As is clear from the above results, the present invention has the advantage that
1-): ``Hora 6'' is a partitioned interior with a protrusion of a toner stirring stone; The magnetic rollers were arranged and fixed so that the magnetic rollers with the same polarity faced the entrance/exit portion of the empty chamber and also faced the repelling magnetic poles, so that the developer conveyed on the outer circumferential surface of the developing sleeve could be transferred into the empty chamber. The action of the homopolar magnetic pole 1 repulsion magnetic pole and the stirring protrusion ensure sufficient mixing and agitation.In particular, the stirring protrusion sufficiently mixes and agitates the developing sleeve in the axial direction, and not only is the toner sufficiently charged, but the toner is Aggregation is prevented, and a good developed image without fog or 11 stains can be obtained. In addition, since only the current image sleeve is rotationally driven and the magnetic roller is fixed, a round mechanical force is required to rotationally drive the magnetic roller.

The image device itself can be made more compact.

[Brief explanation of drawings]

Figure 3 shows the first embodiment, Figure 1 is a sectional view showing the overall configuration, Figures 2a and 2b are the oblique and perspective views of the height regulating plate, and Figure 3 is a cross-sectional view showing the overall configuration. The outer circumferential surface is magnetic, and the magnetic flux density is amazing. Fig. 4 is a sectional view showing the overall configuration of the second embodiment, and Fig. 5 is a sectional view of the alligator part of the current dripping device disclosed as prior art. ;- (9)...photosensitive drum, (10) developing sleeve, (
11)・Magnetic roller, (13)・・tonaho・sono (,
(14)...Vacancy, (15)...Partition plate, (16)
)...Hot height regulation plate, (17)...Stirring protrusion, (1
8)・Toner supply roller, (A)...development area, (N
+), (N,)... homopolar magnetic pole, (0)/repulsive magnetic pole. Patent applicant: Minolta Camera Co., Ltd. Agent Patent attorney: Said Ao, and 2 others ゛・・・□、4′・] 1, l:'L'l,,l,
゛・111. :,((,,(,',1.'1
'G. “ , −”′,・11,−1,6− ::” ” ,,,,.・I 2・′..., ゛・ Hatakeze, ′
-・Figure 3 Figure 4 Figure 13 Toner hopper e Middle 1. 2°, “,1..F!-91°6
0I--1. 1184 shaku 4〉82゛°. ””’ ””” ”p, ν room? '#':-::fJ' +-
1-Unexamined Japanese Patent Publication No. Sho G1-201280 (6)

Claims (1)

[Claims] (1) By supplying the toner contained in the toner hopper to the magnetic carrier that is magnetically attracted to the outer circumferential surface of the developing sleeve containing a built-in magnetic roller, the magnetic carrier is attached to the outer circumferential surface of the developing sleeve. An electrostatic latent image developing device that prepares a magnetic developer consisting of a mixture with a toner and uses this magnetic developer to develop an electrostatic latent image carried on the surface of an electrostatic latent image carrier, comprising: A vacant chamber separated from the toner hopper is provided above the developing sleeve, and a protrusion for stirring the developer is provided in the vacant chamber, while homopolar magnetic poles are formed on both sides in the circumferential direction of the developing sleeve via repelling magnetic poles on the outer periphery. An electrostatic device characterized in that a magnetic roller is arranged and fixed such that the same magnetic poles face an entrance/exit portion of the empty chamber, and the developing sleeve is rotatably driven in a direction from the empty chamber toward a developing area. Latent image developing device.