JPH052163U - Development device - Google Patents

Abstract

(57) [Summary] [Structure] A developer replenishing port having a narrow opening corresponding to the developer replenishing width of the developing device main body 20 is provided at substantially the center of the developer replenishing width, and development is performed from the developer replenishing port. The length up to the film seal 30 of the agent cartridge 21 was set to a predetermined length. [Effect] Even if the developer in the developer cartridge is set in the main body of the developing device with a bias, and the developer is supplied, the supplied developer is biased in the developer supply width direction. Does not happen.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a developing device used in an electrophotographic recording device or the like and equipped with a removable developer cartridge.

[0002]

[Prior Art]

 Conventionally, in a developing device used for an electrophotographic recording device, etc., a developer cartridge containing a replenishing developer is attached to a developer replenishing port on an upper part of a hopper of the developing device main body, and a seal is peeled off to remove the developer There is one that replenishes the hopper by its own weight. This will be described with reference to the drawings.

FIG. 4 is an oblique view of the appearance of a conventional developing device as seen obliquely from above. The developing device main body 1 has a developer replenishing port 3 for replenishing developer and a lock mechanism 4 on an upper portion of a frame 2, and a hopper 5, a supply roller 6 and a developing roller for storing the replenished developer inside the frame 2. 7 is provided. The width of the developer supply port 3 is the same as the developer supply width 1 of the hopper 5. The developer cartridge 8 containing the replenishment developer is composed of a case 9 and a film seal 10 for sealing the developer in the case so as not to leak. The operation will be described. First, the developer cartridge 8 is shaken left and right as shown in FIG. 5 to eliminate the deviation of the developer 11. This is because when a developer maker packs the developer 11 in the case 9, the developer 11 is dropped and packed into the case 9 through a nozzle, so that a space is inevitably generated. Due to this space, deviation of the developer 11 is likely to occur in the developer cartridge 8. When the developer cartridge 8 is set in the developing device main body 1 as shown in FIG. 6 (a) while the developer 11 is biased and the film seal 10 is peeled off, as shown in FIG. 6 (b). As shown, the developer 11 supplied to the hopper 5 also remains biased in the developer supply width direction. Therefore, before setting, the developer cartridge 8 is shaken right and left to eliminate the deviation of the developer 11. After removing the unevenness of the developer 11, gently set the developer cartridge 8 in the direction of arrow A into the developer replenishing port 3 of the developing device main body 1 and fix it by the lock mechanism 4, and then the film of the developer cartridge 8 The developer 11 is supplied to the hopper 5 by peeling off the seal 10 by a peeling means (not shown).

[0004]

[Problems to be solved by the device]

 In the conventional developing device, when setting the developer cartridge in the main body of the developing device, if you forget to shake the developer cartridge left and right and set it in the developer supply width direction as shown in Fig. 6B. On the other hand, the paper is supplied with a deviation, and if printing is continued, uneven printing occurs on the side with less developer due to deviation, even if the developer still remains in the developing device, and the printing quality is degraded. There was a problem.

According to the present invention, even if the developer cartridge is set in the main body of the developing device while the developer is biased, the supplied developer is biased in the developer supply width direction of the hopper. It is an object of the present invention to provide a developing device that does not have such a developing device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the developing device of the present invention, a developer replenishing port having a narrow opening corresponding to the developer supplying width of the hopper is provided in a substantially central portion of the developer supplying width, and The height from the agent supply port to the seal of the developer cartridge is set to a predetermined height.

[0007]

[Action]

 In the developing device configured as described above, if the developer cartridge is set in the developing device main body while the developer is biased and the seal is peeled off, the developer falls under its own weight. The developer that has fallen into the hopper collides with the hopper side and violently jumps in all directions and upwards due to the reaction of the impact force. Then, it scatters in the width direction of the supply of the image developer in the hopper, which has less resistance. This is like an explosion in a room, where the blast gathers towards the one with less resistance and escapes.

Therefore, according to the present invention, even if the developer cartridge is set in the developing device main body while the developer is offset, the supplied developer is not supplied in the developing device main body in the developer supplying width direction. There is no bias against.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The elements common to the drawings are given the same reference numerals.

FIG. 1 is an external perspective view showing an embodiment, and shows a state in which a developer cartridge is set in the developing device main body 20.

FIG. 2 and FIG. 3 are a BB sectional arrow view and a CC sectional arrow view of FIG. 1, respectively, and FIG. 2A and FIG. 3A show the film seal before being peeled off. 2 (b) and FIG. 3 (b) show after peeling.

The developing device main body 20 internally rotatably supports a developing roller 7, a developing blade 22, a developer carrying roller 6, and a stirring bar 21 on a frame 23. Then, the developing roller 7 is rotated, the developer 24 is thinned by the developing blade 22, and the developer 24 is made to adhere to the electrostatic latent image on the surface of the photosensitive drum 25 for development.

The developer cartridge 21 is mounted by opening a door 27 provided in the developer replenishing port 26 on the hopper 5 of the developing device main body 20. The developer cartridge 21 is composed of a case 29 that stores the replenishment developer 28 and a film seal 30 that seals the developer 28 inside the case 29 so as not to leak. The film seal 30 divides the inside of the developer cartridge 21 into a developer storage section 29a and a developer guide section 29b for preventing the replenishment developer 28 from scattering during replenishment. When the developer cartridge 21 is set, the developer storage portion is located so that the height dimension H is higher than the developer supply port 26 at 29a. As for the height dimension H, as shown in FIG. 2B, the dimension E in the lateral direction of the hopper 5 and the dimension D of the developer guide portion 29b corresponding to the dimension E are made substantially equal to each other. As shown, the developer supply width dimension of the hopper 5 is l, the width dimension of the developer guide portion 29b corresponding to the dimension 1 is lc, the void volume of the hopper 5 is V, and the replenishment developer 28 in the developer storage portion 29a is 28. When the volume of is Vc and the coefficient is α

[0014]

[Equation 1]

Can be obtained from Here, α is determined by the fluidity of the developer, the shape and resistance of the hopper 5 in the developing device main body 20, and when the fluidity of the developer is about 30 g / min, α = 14 to 24. (Use the fluidity used by the developer manufacturer.) The developer guide portion 29b of the developer cartridge 21 is provided with a slit 29c for drawing out the film seal 30 as shown in FIG. A sponge (not shown) is provided in the slit 29c to prevent the developer 28 from being blown out when the film seal 30 is peeled off.

Next, the operation will be described. The door 27 of the developing device main body 20 is opened, the developer guide portion 29b of the developer cartridge 21 is attached to the developer replenishing port 26, and after fixing by a fixing means (not shown), the film seal 30 protruding from the slit 29c. The peeling surplus surface 30a is pulled, and the film seal 30 is peeled off. The developer 28 falls from the developer storage unit 29a by its own weight. The developer 28 that has dropped into the hopper 5 collides with the bottom surface of the hopper 5 and then violently jumps upward due to a reaction. The jumped developer 28 scatters in the developer supply width direction of the hopper 5, which has less resistance, by the same action as the blast. As a result, the developer 28 supplied to the hopper 5 has some unevenness as shown in FIG. 3B, but is stored in a state in which there is no deviation in the developer supply width direction.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

Even if the developer cartridge is set in the main body of the developing device while the developer is biased, and the developer is supplied into the hopper, the supplied developer is distributed in the developer supply width direction. By eliminating the deviation, it is possible to provide a stable print quality until the developer in the hopper becomes almost empty.

Further, by making the developer replenishing port small, there is also an effect that the risk of foreign matter entering the main body of the developing device is reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment.

2 is a sectional view taken along the line BB of FIG.

3 is a cross-sectional view taken along the line CC of FIG.

FIG. 4 is an external perspective view showing a conventional example.

FIG. 5 is an explanatory diagram of a preparatory operation before setting.

FIG. 6 is an explanatory diagram showing offset supply.

[Explanation of symbols]

 1,20 Developing device main body 3,26 Developer supply port 5 Hopper 8,21 Developer cartridge

Claims (1)

[Claims for utility model registration] [Claim 1] A developer cartridge containing replenishment developer is attached to the developer replenishment port provided on the upper part of the hopper of the main body of the developing device, the seal is peeled off, and the developer is put on its own weight. In a developing device for replenishing into a hopper, a developer replenishing port having a small opening width corresponding to the developer replenishing width of the hopper is provided at a substantially central portion of the developer replenishing width, and a developer cartridge is sealed from the developer replenishing port. The developing device is characterized in that is set to a predetermined height.