JPH11272050A - Developing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a toner cartridge to a developing cartridge only at a specified attaching position by constituting an accepting hole part of a 1st area where a guide means slides and a 2nd area where it is turned. SOLUTION: The transverse shape of the guide means GU projecting outward at the position of the shaft hole M79A of a flange 479 is non-circular, desirably, it is constituted to be almost elliptical shape by parallel line parts GU1 and circular-arc parts GU2. A receiving means RE is provided at the tail part of the sidewall 423 of the case of the developing cartridge to which the toner cartridge 470 is attachably/detachably attached, and a disk-like supporting part RE1 supporting both sides of the flange 479 of the cartridge 470 and the receiving hole part RE2 recessed to be inclined in its radial direction are formed. The receiving hole part RE2 is constituted of an open guide groove RE4 and a circular hole RE3 succeeding to the groove RE4 in a center position. When the cartridge 470 is attached, an outside case is fixed on the case of the developing cartridge and an inside case is independently rotated of the outside case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a developing device used for an image forming apparatus such as a laser printer and a laser facsimile for forming an image by electrophotography.

[0002]

2. Description of the Related Art Conventionally, as a developing device of this type, a toner storage container which is detachably provided in an electrophotographic printing device is disclosed in, for example, JP-A-3-288875 (known example). ing.

In this known example, a substantially rotary toner storage container is provided with a spiral coil-shaped stirring member 4 driven by an outer cylinder 1, an inner cylinder 2, and a gear 5.
The end plates 3a and 3b for closing both ends of the inner cylinder 2 are detachably supported by a toner cartridge holding portion 7 with a fixing member 6 interposed therebetween.
1 is employed, so that the fixing member 6 is rotatably supported in the concave portion 73 and the guide 62 is engaged with the groove 31.

[0004]

According to the above-mentioned known example, toner can be easily supplied by a detachable toner cartridge, but there is still room for improvement.

That is, in the above-mentioned known example, the structure of the attaching / detaching means of the toner storage container is extremely complicated, and a large number of steps are required for the attaching / detaching operation. In addition to the risk of maintenance, the maintenance and inspection required skill.

A first problem to be solved by the present invention is to provide a toner cartridge which can be mounted on a developing cartridge only at a predetermined mounting position.

A second problem to be solved by the present invention is to provide a safe device which does not cause toner leakage.

A third problem to be solved by the present invention is to provide a device having a simple structure and good operability.

[0009]

Means for solving the above problems are as follows in the present invention for solving the above respective problems.

(1) In a developing device comprising a developer carrier and a detachable toner cartridge, a case of the developing cartridge is provided with a receiving means capable of engaging the guide means of the toner cartridge. The toner cartridge is provided with the guide means interlocked with a handle for opening and closing the opening of the toner cartridge, and a receiving hole of the receiving means can slide the guide means.
And an opening and closing operation of the opening of the toner cartridge by rotating the guide means only in the second area. apparatus.

(2) The first region is a linear guide groove having a small width, and the second region is a circular hole larger than the width. The developing device as described in the above.

According to the corresponding means, the guide means is inserted into the receiving means, and the toner can be supplied by turning the inner case of the toner cartridge only at a required mounting position.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 shows a developing unit 400 according to the present invention.
FIG. 1 is a schematic diagram illustrating an example of an image forming apparatus 1000 using the image forming apparatus.

Hereinafter, the outline of the image forming apparatus 1000 will be described, and then the developing cartridge 410 will be described in detail.

The image forming apparatus 1000 includes yellow,
This is an apparatus capable of forming a full-color image using a developing device using a developer of four colors of cyan, magenta, and black (a toner is used as an example, and is hereinafter referred to as a toner T).

In FIG. 6, reference numeral 1100 denotes an outer box of the apparatus. Inside the outer box 1100, an exposure unit 100, a paper feed unit 200, a photosensitive cartridge 300, a developing unit 400, an intermediate transfer unit 500, and a fixing unit 60 are provided.
0 and the like are provided.

The photosensitive member cartridge 300 is a latent image carrier 3
10 and a charging roller 32 serving as a charging unit that contacts the outer peripheral surface of the latent image carrier 310 to uniformly charge the outer peripheral surface.
0 and a cleaner section 330.

The developing unit 400 includes a developing cartridge 410Y for yellow and a developing cartridge 41 for cyan.
0C, a developing cartridge 410M for magenta, and a developing cartridge 410K for black.

Each of these developing cartridges 410Y, 410Y
10C, 410M, and 410K have yellow, cyan, magenta, and black toners built therein, respectively.

The developer carrying members 430Y and 43
0C, 430M, and 430K, and only one of the developer carriers of the developing cartridge is a latent image carrier 3.
10 can be abutted.

The intermediate transfer unit 500 includes a medium drive roller 510, a wrinkle removing roller 520, and a tension roller 5.
30, a secondary transfer roller 540, an intermediate transfer belt 550 stretched around each of these rollers, and a medium cleaner 560 that can be brought into contact with and separated from the intermediate transfer belt 550.

A backup roller 570 is opposed to the secondary transfer roller 540.

The intermediate-medium drive roller 510 is driven to rotate at substantially the same peripheral speed as the latent image carrier 310 by a transmission means (not shown).
It is designed to be driven to circulate at substantially the same peripheral speed.

While the intermediate transfer belt 550 is being driven to circulate, the toner image on the latent image carrier 310 is transferred to the intermediate transfer belt 5.
The toner image transferred onto the intermediate transfer belt 550 and transferred onto the intermediate transfer belt 550 is transferred to a recording sheet S such as a sheet supplied from the sheet feeding unit 200 between the toner image and the secondary transfer roller 540.

The paper supply unit 200 includes a tray 210 on which the recording sheets S are placed in a stacked state, a pickup roller 220, and a separation roller 230 for surely separating the paper fed by the pickup roller 220 into individual sheets. have.

The recording sheet S fed by the sheet feeding unit 200 is conveyed by the conveying roller 240 to the intermediate transfer belt 55.
The toner image is supplied between the transfer roller 0 and the secondary transfer roller 540, subjected to a transfer process, fixed by the fixing unit 600, and discharged from the paper transport roller 250.

The fixing unit 600 includes a fixing roller 610 having a heat source and a pressing roller 62 pressed against the fixing roller 610.
0.

The operation of the image forming apparatus 1000 as described above is as follows.

When a print command signal (image forming signal) is input from a host computer (not shown), the latent image carrier 310 and the intermediate transfer belt 550 are driven to rotate.

The outer peripheral surface of the latent image carrier 310 is uniformly charged by the charging roller 320.

The uniformly charged outer peripheral surface of the latent image carrier 310 is exposed by the exposure unit 100 in accordance with the image information of the first color (for example, yellow) to form a yellow electrostatic latent image.

The developer carrier 430Y of the developing cartridge 410Y for the first color (for example, yellow) starts to rotate and contacts the latent image carrier 310 at the same time, whereby the electrostatic latent image is developed. A toner image (for example, yellow) is formed on the latent image carrier 310, and the developer carrier 430Y of the developing cartridge 410Y for the first color.
Is separated from the latent image carrier 310 and stops rotating.

The toner image formed on latent image carrier 310 is transferred from latent image carrier 310 to intermediate transfer belt 550.

After the toner remaining on the latent image carrier 310 is removed by the cleaner blade 331 of the cleaner section 330, the toner is collected by the waste toner screw 332.

The second, third, and fourth colors are repeated according to the content of the print command signal, and a toner image corresponding to the content of the print command signal is transferred to the intermediate transfer belt 550.
The above operations (1) to (4) are repeated.

At a predetermined timing, the sheet feeding unit 20
0, the recording sheet S is supplied, and when the leading end of the recording sheet S reaches the secondary transfer roller 540, the intermediate transfer belt 550
The upper toner image is transferred onto the recording sheet S.

When the recording sheet S passes through the fixing unit 600, the toner image is fixed on the recording sheet S, and the recording sheet S is discharged out of the case 1100 via the paper conveyance roller 250.

The outline of the image forming apparatus 1000 has been described above. Next, the developing unit 400 and the developing cartridge 410 will be described.

The developing unit 400 has four developing cartridges 410 (Y, C, M, K) which are removably incorporated.
It has.

Incidentally, an arbitrary developing cartridge 410 in the outer box 1100 can be attached and detached, and the photoreceptor cartridge 300 can also be attached and detached.

FIG. 7 is an enlarged view of the developing cartridge 410M.

Four developing cartridges 410 (Y, C,
M, K) are slightly different in their shapes and the like, but have a common basic structure. Therefore, an embodiment will be described with reference to a developing cartridge 410M for magenta.

The developing cartridge 410 includes a case 420
A developer carrier 430 for supplying the toner T stored in the case 420 to the surface of the latent image carrier 310; and a supply roller 4 for supplying the toner T to the developer carrier 430.
40, an agitator 451, 452 provided with two transfer fins 461, 462 for transferring the toner T toward the supply roller 440, and a toner cartridge 470 capable of replenishing the toner T and the developer carrier 430. And a thinning means 480 for regulating the amount of toner on the developer carrier 430.

The toner cartridge 470 is detachable from the developing cartridge 410, and as shown in FIG. 2, an inner / outer case 472 fitted with an elastic member 471 interposed therebetween so as to be relatively displaceable. , 473, and has an opening 474 in the inner and outer cases 472, 473.
475 are arranged so that the toner T can be supplied.

Reference numeral 479 denotes a flange which is locked to the inner case 472 and rotates integrally with the inner case 472, and is disposed at both ends in the longitudinal direction of the inner case 472.

Reference numeral 476 denotes a handle protruding from the flange 479 for turning the inner case 472 with respect to the outer case 473.

The toner cartridge 470 is formed by integrally forming a two-part member into a cylindrical shape, and has an agitator formed by a shaft hole 479A provided at the center of a flange 479 for closing both sides of the inner case 472. 477 are supported, and the agitator gear 477G can be turned by a driving means (not shown).

The cross-sectional shape of the guide means GU protruding outward at the position of the shaft hole 479A of the flange 479 is non-circular, as shown in FIG. 3, and is preferably approximately a parallel straight part GU1 and an arc part GU2. It has an elliptical shape.

Next, at the tail of the side wall 423 of the case 420 of the developing cartridge 410 on which the toner cartridge 470 is detachably mounted, as shown in FIG.
Is provided.

Further, rotation stoppers ST1 and ST2 of the outer case 473 are provided at the tails of the outer case 473 of the toner cartridge 470 and the case 420 of the developing cartridge, respectively, and the toner cartridge 470 is attached to the developing cartridge 410. The outer case 473 is fixed to the case 420 of the developing cartridge, and the inner case 472 can rotate independently of the outer case 473.

The receiving means RE is provided with a disk-shaped support portion RE1 for supporting both sides of the flange 479 of the toner cartridge 470, and the support portion RE1 is recessed in an inclined manner in the radial direction. The receiving hole RE2 is opened.

Regarding the shape of the receiving hole RE2, an open guide groove RE4 and a subsequent circular hole RE at the center position are formed.
In particular, the guide groove RE4 is obliquely straight, and is preferably oriented so as to be opened to a position above the circular hole RE3.

For the dimensions of each part, guide means GU
The width D1 of the parallel straight portion GU1 and the curvature R1 of the arcuate portion GU2 of the guide means GU are set so as to move smoothly in the receiving means RE without rattling, and the width D2 of the guide groove RE4 of the receiving means RE, respectively. The circular hole RE3 is formed to have a dimension slightly smaller than the curvature R2 and a dimension having a curvature R1 larger than the width D2.

Reference numeral 477 denotes an agitator, which is a fin 4
78 to prevent coagulation of the toner T and support the supply.

The developer carrying member 430 is rotatably supported by the case 420, and is supplied in parallel with the developer carrying member 430 and has supply surfaces 440 pressed against each other.
Is rotatably supported by the case 420.

The thinning means 480 of the toner T is
The blade 482 is held in a cantilever shape on the developer holding member 81 and is in contact with the developer holding member 430.

The case 420 is provided with a substantially semi-cylindrical row of toner tanks 424, and the rotating agitator 451,
The toner T is transferred such that the fins 461 and 462 of the 452 are embraced in a wedge-shaped space formed by sliding contact with the inner surface 424a of the toner tank 424.

The fins 461 and 462 are formed in a flexible thin plate shape, and when the toner T is rapidly displaced and released from the toner tank 424 near the supply roller 440, the toner T is transported so as to be embraced in the wedge-shaped space. Fins 46
The toner is conveyed to the surface of the supply roller by a mechanical conveyance force as if the toner is repelled by the restoring force due to the elasticity of 1,462.

The rotational loads of the agitators 451 and 452 and the agitator 477 of the toner cartridge 470 are made different from each other in order to equalize the rotational load. In this case, n toner transfer means are connected in series (in this case, n = 3), n transfer means fins 461, 46
By shifting the angles of 2, 478 by 360 ° / n, the sliding contact length of the fins 461, 462, 478 in sliding contact with the inner surface 421a is made substantially constant regardless of the angles of the agitators 451, 452, 477.

The agitators 451, 452, 4
The load fluctuations before and after being repelled by the toner 77 are dispersed.
1, 452, 477 equalize the load and reduce the torque fluctuation of the device.

The case 420 is detachably mounted on the mounting table 1200.

Therefore, in order to attach the toner cartridge 470 to the developing cartridge 410, the toner cartridge 470 is disposed as shown in FIG.
U is provided in a receiving portion RE provided in a supporting portion RE1 of a receiving means RE.
2 and inserted in the direction shown by the arrow A, and the state where the guide means GU arrives at the position of the circular hole RE3 opened at the center position of the receiving means RE corresponds to the predetermined mounting position of the toner cartridge 470 (FIG. 4), the curvature R1 of the guide means GU is larger than the width D2 of the guide groove RE4 of the receiving means RE.
Can be turned.

Therefore, when the handle 476 is turned in the direction of arrow B (see FIG. 4), the outer case 473 is fixed to the tail of the developing cartridge case 420.
The inner case 472 integrally attached to the outer case 4
The inner case 473 is rotated so that the respective openings 474 and 475 are aligned so that the toner T in the inner case 472 can be supplied (see FIG. 5).

On the other hand, since the guide means GU cannot rotate except at the position of the circular hole RE3 opened at the center position of the receiving means RE, when the toner cartridge 470 is incompletely mounted on the developing cartridge 410, The opening and closing operation of the opening of the toner cartridge 470 cannot be performed, so that careless toner leakage can be prevented.

When the toner cartridge 470 is replaced, the toner cartridge 470 can be easily replaced by the reverse operation procedure.

The developing cartridge 4 configured as described above
10, the toner cartridge 470 is loaded, and the inner case 472 is turned by the handle 476 to open the opening 47.
4 and 475 are aligned, the toner T is transported in the agitator 452 and 451 directions by the swirled agitator 477, and is supplied to the developer carrier 430 via the supply roller 440 which is driven to rotate, and the toner T is placed on the latent image carrier 310. It is to adhere to.

The developing cartridges 410 as described above are similarly for yellow 410Y and cyan 410Y.
C, Magenta 410M, Black 41
A total of four (0K) are detachably attached to the outer box 1100, and their functions are common to those of the above-described magenta 410M, so that repeated description is omitted.

[0069]

The specific effects of the present invention described above are as follows.

A guide means is provided on the flange of the toner cartridge mounted on the developing cartridge so that the toner cartridge can be mounted on and removed from the receiving means of the developing cartridge, and the inner case can be rotated together with the flange only at a predetermined mounting position. Therefore, the toner can be supplied accurately.

Since the toner cartridge is opened only at a predetermined supply position, leakage of toner can be prevented.

The structure is simple, the mounting and dismounting of the toner cartridge is easy, and the operability is excellent.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a toner cartridge according to an embodiment of the present invention.

FIG. 2 is an assembly view of the toner cartridge in FIG. 1;

FIG. 3 is an explanatory view of mounting the toner cartridge in FIG. 1;

FIG. 4 is an explanatory diagram of a mounting process next to FIG. 3;

FIG. 5 is an explanatory diagram of a mounting process next to FIG. 4;

FIG. 6 is a schematic diagram of an image forming apparatus equipped with a developing cartridge according to the present invention.

FIG. 7 is an enlarged view of a developing cartridge according to the present invention.

[Explanation of symbols]

 410 developing cartridge 420 case 470 toner cartridge GU guide means RE receiving means RE2 receiving hole RE4 guide groove

Claims (2)

[Claims] 1. A developing device comprising a developer carrier and a detachable toner cartridge, wherein a case of the developing cartridge is provided with a receiving means capable of engaging the guide means of the toner cartridge. The toner cartridge is provided with the guide means interlocked with a handle for opening and closing the opening of the toner cartridge, and a first area in which the receiving hole of the receiving means can slide the guide means. A second region that can be rotated, and the second region
The opening and closing operation of the opening of the toner cartridge is possible by rotating the guide means only in the region of (1). 2. The device according to claim 1, wherein the first region is a linear guide groove having a small width, and the second region is a circular hole having a size larger than the width. Developing device.