JPS6017772A - Developing device - Google Patents

Abstract

PURPOSE:To improve an operability, to prevent effectively a developer from scattering, also to make a device simple and light, and to reduce the number of parts by using as a replenishing device a cartridge whose replenishing port can be installed and detached to and from a position opposed directly to a carrying body and a position separated from it. CONSTITUTION:¦As for a hopper 33, the hopper itself is a cartridge which seals up tightly a developer (a) in advance and can be replaced, and installed between a doctor blade 34 attached to a side frame 37 and a support 38. Also, a linear and rectangular replenishing port 39 running along the axial direction of a magnet roller 32 is provided on the lower end of the hopper 33. In this way, a replenishing device 33 is a cartridge whose replenishing port can be installed and detached to and from a position opposed directly to a carrying body 32 and a position separated from it, therefore, an operability is improved and scattering of a developer is prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a developing device used, for example, in an electronic copying machine.

[Technical background of the invention and its problems]

Conventionally, as shown in FIG. 1, the above-mentioned type of developing device usually includes a developing roller 2 in a container 1 containing developer a,
The developer is conveyed and supplied to the photoreceptor 3 by the 20 rotations of the developing roller. Next, it is necessary to replenish the container 1 with developer a as appropriate.

By the way, this replenishment method ranges from the replenishment method using a cup such as a spoon from a 7'c wide Robin containing developer a, the replenishment method by opening a sealed bag of developer at and pouring it in, and the replenishment method by opening a sealed bag of developer a and pouring it in. A replenishment method in which the outlet shape and dimensions of the pin contained therein are improved and the developer a is directly poured into the container 1. A cartridge containing the developer a is placed in the upper part of the container I, and in this state, the developer a is poured into the container 1. Although improvements have been made in terms of workability and the scattering of developer a to the drop-in replenishment method, it is still not satisfactory. The purpose is to provide a complete developing device that can effectively improve workability and prevent scattering of developer, simplify the device and reduce the number of parts.

[Summary of the invention]

The present invention includes a conveying body that conveys developer to develop an area to be developed, and a replenishing device that directly faces the conveying body and has a replenishing port that discharges the developer side to the conveying body, and the replenishing device In this case, the replenishing port is a cartridge that can be loaded and removed at a position directly facing the conveyance body and at a remote position.

[Embodiments of the invention]

Hereinafter, an embodiment of the single-shot device will be described with reference to all of FIGS. 2 to 8. FIG. 2 shows an electronic copying machine using a developing device according to the present invention, and 11 is a main body. This main body 1
On the top surface of 1, there is a document table 1 that moves back and forth during the copying process.
2, and a photoreceptor 13 serving as a drum-shaped developing portion that rotates in synchronization with the reciprocating movement of the original document mounting table 12 is pivotally supported approximately at a hollow shaft inside the main body 11. An exposure device 16 including a lens 13, a lens 14, a mirror 15, etc. is provided between the photoreceptor 13 and the original platen 12, and it illuminates the original on the original platen 12 and uses the reflected light to expose the document. It is adapted to be guided onto the body 13 to form an image of the document. Further, around the photoreceptor 13, in order from this image forming position along the rotational direction of the photoreceptor 13, there is a developing device 12, a transfer device 18, a peeling device 19, a static eliminator 20, and so on. Cleaning device 2
1, a static eliminator 2, and a charging device 23 are arranged.

Further, a transfer path 24 for transfer paper P passing between the photoreceptor 13, the transfer device 18, and the peeling device 19 is provided in the main body 11, and the base end thereof is connected to a manual feed guide 25 provided on one side of the main body 11. The paper feeding device 27 feeds paper independently from the paper feeding cassette 26, and its end faces the paper ejection tray 29 via the fixing device 28◎ Furthermore, the main body 11F! Trap, transfer path 24 as shown in Figure λ
It is possible to separate the upper unit 30 and the lower unit 3 at the border. The upper unit 30 has one end rotatably supported by the lower unit 31,
It can be opened and closed.

First, an electrostatic latent image corresponding to the original is formed on the photoreceptor 13 by the charging device 23 and the exposure device 16. Next, this electrostatic latent image is developed by applying a sea component magnetic developer a to the developing device 17, and a developer image is formed on the photosensitive body 13. This developer image is transferred by the transfer device 18 onto the transfer paper P fed by the paper feed device 27, and the transfer paper P onto which this developer image has been transferred is peeled off from the photoreceptor I3 by the peeling device 19. After that, the developer image is fixed by the fixing device 28, and the paper is discharged onto the paper discharge tray 29.

On the other hand, the developer a remaining on the photoreceptor 13 without being transferred onto the transfer paper P is neutralized by the static eliminator 2° and then removed by the cleaning device 21, and the photoreceptor 13 from which the developer a has been removed is The static electricity is eliminated by the static elimination lens 22, and the next process begins.

By the way, the developing device 17, as shown in FIG.
- A magnet row 232 as a conveying body that magnetically attracts the component magnetic developer a and conveys it to the photoreceptor 13, a hopper 33 as a replenisher that replenishes the developer ai to the magnetic roller 32, and a hopper 33 as a replenisher that replenishes the developer ai to the magnetic roller 32; It is composed of a doctor blade 34 and the like that regulates the layer thickness of the developer a.

The magnet roller 32Fi is composed of a non-magnetic cylindrical sleeve 35 that rotates in the same direction as the photoreceptor 13 on the opposite side to the photoreceptor 13, and a magnet 36 that is provided inside this sleeve 35 and rotates in the opposite direction. .

The doctor blade 34 may be made of a non-magnetic material, for example, with a magnetic permeability of 1.08 or less (it is sufficient if the magnetic permeability is 1.1 or less).

] The hopper 3 is made of stainless steel, which is a weakly magnetic material.
downstream f in the developer conveyance direction by the magnet roller 32 of No. 3
It is arranged near the magnet row 232, that is, above the magnet row 232, substantially perpendicular to its circumferential surface. and,
As shown in FIG. 5, the distance d between the doctor blade 34 and the magnet roller 32 is 0.15 to 0.40f11+
+! For example, it is set to 0.20-. Note that, with respect to this distance d, the distance g between the magnet roller 32 and the photoreceptor 13 is set to d+0.10>g>d+o, for example, 0.30 wm.

The above-mentioned hot spring 33 is equipped with a replaceable cartridge in which the developer a is sealed in advance,
It is designed to be installed between a doctor blade 34 and a support 38, which are attached to the doctor blade 7. Also, hopper 3
At the lower end of 3, there is a magnet row 232 as shown in FIG.
A linear and rectangular replenishment port 39 is provided along the axial direction. The opening width W of the replenishment port 39 in the developer transport direction by the magnet row 232 is 0.5 to 2.5fi, and the distance δ between the replenishment port 39 and the magnet row 232 is 0.5 to 2.5fi.
3 to 0.5 m"c, so that W≦δ. Then, in the above-mentioned installed state, the replenishment port 39 is close to and opposite to the troller 32, and the developer a stored therein is
is drawn out by the magnetic force of the magnet 36 according to the consumption amount.

Thus, the one-component magnetic developer side a stored in the container/mother 33 is drawn out onto the sleeve 35 from the supply port 39 by the rotating magnetic pole of the magnet 36 inside the sleeve 35.

Therefore, new (fresh) developer a, which is free from external influences such as stirring, is replenished little by little in accordance with the amount of developer a on the sleeve 35 consumed. This pulled out developer a is regulated to a predetermined layer thickness by the rotation of the sleeve 35 and the doctor blade 34 adjacent to the HONNO Z33VC, and is supplied onto the photoreceptor 13 to develop the electrostatic latent image. .

According to the above configuration, since the developer a is drawn out by the magnetic force of the magnet row 232 according to the consumed amount, less developer a comes into contact with the rotating sleeve 35.
Deterioration due to aggregation of developer a, developer a on sleeve 35
Non-uniformity and unstable charging can be prevented, and a good developed image without uneven image density or fog can be obtained.

Moreover, since there is no stirring, the life of the developer a can be extended and the required amount can be supplied, so that the consumption amount of the developer a can be suppressed.

Furthermore, since the Honno 933 is made into a cartridge, it is possible to improve workability and effectively prevent scattering of the developer a, and also to simplify and reduce the weight of the device and the number of parts.

Furthermore, since the doctor blade 34 is disposed above the magnet row 232 substantially perpendicularly to its circumferential surface, the space formed by the doctor blade 34 and the magnet roller 32 is shaped like an obtuse angle and becomes wide. 33
The doctor blade 34 can be installed without any obstruction and the distance d between the doctor blade 34 and the magnet roller 32 can be easily installed.
It is easy to set the distance d, and the distance d can be measured accurately. Also, since the distance d between the surface of the photoconductor 13 and the surface of the sleeve 35 is d=iQ, and the distance d between the doctor blade 34 and the surface of the sleeve 35 is set to 0.2, the aggregation of the magnetic developer a Adverse effects can be prevented and good images without bleeding can be obtained.

Furthermore, since the doctor blade 34ft is made of non-magnetic material, the -component magnetic developer a? By regulating the layer thickness, a predetermined amount can be stably supplied. That is, as a property of the -component magnetic developer a, if a magnetic substance is present, the developer will change due to its magnetic force! L is attracted. Therefore, if the doctor blade 34 is made of a magnetic material, a phenomenon as shown in FIG. 7 will occur. Further, as shown in FIG. 8, the magnetic developer a adheres to the edge portion of the doctor blade 34 and gradually grows, and is destroyed by the magnetic force and the transport balance of the developer a caused by the rotation of the sleeve 35. Take.

As a result, the layer thickness of developer a changes, resulting in instability of image density. In addition, developer agglomerates due to the growth or collapse of the magnetic developer adhesion at the edge portion are caught in the gap between the doctor blade 34 and the sleeve 35, thereby preventing the developer a from being transported. From the above, the above problem can be effectively solved by forming the doctor blade 34 from a non-magnetic material. Furthermore, the torque required to rotate the magnet 36 can be reduced, resulting in power savings, increased rigidity of the entire device, and
Vibration can be suppressed.

By the way, ho, y no'? The replenishment port 39 of JJ may be opened toward the upstream side in the developer conveyance direction by the magnet roller 32, as shown in FIG.

The hopper 33 may be provided with an L-shaped fishing part 40f, as shown in FIG. 10, so that it can be hooked onto a doctor blade.

Furthermore, as shown in FIG. 11, the hook 433 may be fixed by providing an elastic hook 41 on the support 38.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a conveying body that conveys developer to develop the to-be-developed area, and a replenisher having a replenishment port directly facing the conveying body and discharging the developer to the conveying body. This replenisher is a cartridge that can be installed and removed in a position where the replenishment port is directly facing the transport body and in a remote position, so it can effectively improve workability and prevent developer from scattering. Moreover, it has excellent effects such as simplifying and reducing the weight of the device and reducing the number of parts.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example, Figs. 2 to 8 show an embodiment of the present invention, Fig. 2 is a sectional view of an electronic copying machine, and Fig. 3 is a sectional view of the same electronic copying machine. A front view, FIG. 4 is a sectional view of the developing device, FIG. 5 is a diagram showing the positional relationship of the magnet, draw 2, doctor blade and hook 9, and FIG. 6 is
, FIGS. 7 and 8 are explanatory views of the operation when the doctor blade is made of a magnetic material, and FIGS. 9 to 11 are views showing other different embodiments of the doctor blade. 13... Developed area (photoreceptor), 32... Conveyor (magnetic roller), 33... Replenisher (Horanori. Applicant's representative Patent attorney Takehiko Suzue Figure 4 37 Figure 5 Figure 6 Figure 7 Figure 9 Procedural amendment document Showa 52.6., RS Q Japan Patent Office Commissioner Kazuo Wakasugi 1, Indication of the case, Patent Application No. 125948/1982, 2, Invention name tag, Developing device 3. Relationship with the case of the person making the amendment Patent applicant (307) Toshiba Corporation 4, Agent 5, Voluntary amendment 7, Contents of amendment (1+ Specification, page 6, lines 19 to 20) rd
+o, ]OM>g>d+0. rd 10.10
Correct it to ``Tomo≧g >d + 0.05 Tomo''. (2) In the specification, change "0.3 to 0.5 tomo" on page 7, line 11 by one to read "0.3 to 5.0 tomo." 587

Claims (1)

[Claims] It is equipped with a conveyance body that conveys developer to develop the area to be developed, and a replenisher having a replenishment port that directly opposes the conveyance body and discharges the developer to the conveyance body, and this replenisher has a replenishment port that is connected to the replenishment port. A developing device characterized in that the developing device is a cartridge that can be installed and removed in a position directly facing the conveyance body and a position away from the conveyance body.