JPS59193473A - Developing device - Google Patents

Abstract

PURPOSE:To prevent a magnetic developer from being scattered by providing an opening means of a magnetic material for opening forcibly an outlet part of a closed state by a magnetic force of a developer cartridge, when this cartridge is set. CONSTITUTION:A magnetic brush developing roller 21' for carrying a magnetic developer 25 to a photosensitive drum 21 is constituted of a non-magnetic cylinder 23a and a magnet roll 23b, and the magnetic developer 25 is carried by a relative rotation of both of them. As for a developer cartridge 24 packed with the magnetic developer 25, the vicinity of its outlet is constituted of a flexible member, its outlet is constituted so as to be closed by a magnetic force of an opposed magnet 26, and a tip part 27a of a set supporting body 27 of the developer cartridge 25 opens forcibly an outlet of a closed state of the developer cartridge 24 to open the outlet of the cartridge 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a developing device for a facsimile IJ, a copying machine, etc., and particularly to a developing device that supplies magnetic developer with a developer cartridge.

Conventional 4':l formation and its problems Conventionally, in the developing device 4 used in an electrophotographic copying machine as shown in FIG. There are some. That is, the photoreceptor drum 1, which has been uniformly charged by the charging corona generator 2, is removed from the photoreceptor drum 1 by the fog light generator 3, which removes the charge from only the information portion of the copy document, and is further processed into a visible image by the developer 4. become Thereafter, the transfer corona generator 7 transfers the image onto the recording paper 6 fed by the feed roller 5, and then the stripping corona generator 8 transfers the image onto the recording paper 6.
- The recording paper 6 is peeled off from the 8-light drum 1 and passed through the JE force constant device 9 to obtain the final hard copy.

After residual developer is removed from the photoreceptor drum 1 by a cleaner 10, the charge is removed by a charge removal lamp 11 and the photoreceptor drum 1 returns to the initial state. In this way, the inside of the developing device 4! 1. Since the lJ image agent is consumed one after another, it is necessary to replenish it by a relatively simple method. Conventionally, as such a developer supply method, a cartridge type developing device f as shown in FIGS. 2 and 3 has been used.
matter was proposed.

;￥1'2 Figure 1 is a clear cut 1 showing the configuration of a conventional developing device having an opening/closing member at the lower opening of the developing agent cartridge 12.
In addition to attaching the developer cartridge 12 containing the developer 13 to the bottom plate 15 of the main body of the developing device, the lid 14 of the bottom opening section can be dispensed by a simple operation from the outside, and the developing device The developer 13 was poured into the top by pushing it open with a protrusion provided on the bottom plate 15 of the main body.

The developer replenished in this manner is conveyed to the developing surface by a developer carrier 16 such as a magnetic brush developing roller.

Next, FIG. 3 is a side sectional view of another embodiment of the conventional developing device, and the same parts as in FIG. 2 are designated by the same reference numerals.

Here, an example using a double cylinder will be explained in particular. The opening 17C of the inner cylinder 172L is the opening 17 of the outer cylinder E1yb.
d, an opening is provided in the developer cartridge 17 for replenishing the developer.

However, according to the developing device shown in FIG. 2, after the developer cartridge 12 is attached to the main body 15 of the developing device and the lid 14 is separated, the developer cartridge 12 is removed until the developer 13 no longer leaks inside the cartridge 12. l! jl could not remove the cartridge from the main body 15 halfway. It's ox.
When the cartridge 12 is replaced, the magnetic developer 13 scatters and the area around the developing device becomes dirty. In the case of the example shown in FIG. 3, when opening and closing the opening 1 of the developer cartridge 17, the developer 13 should not enter the gap between the inner cylinder 17a and the outer circle i:1) 17b. Therefore, the fit between the inner side 1 t[]ii'j) 17a and Daro's law cylinder 17b required a degree of 'rTj', resulting in high costs.If the cartridge 17 is removed many times, the inner side 1 rrJt: '7'+172L and the magnetic receptacle 17 remaining in the gap q9 between the outer cylinder 17b
)) Therefore, there was a drawback that the area around the developing device became dirty.

This problem can be solved by improving the sealing degree of the opening of the cartridge 17, but the particle size
Developer particles of several micrometers are placed in a tube ((
To prevent it from completely collapsing by doing this, l111
Yes. Moreover, such a procedure complicates the opening/closing mechanism, thereby causing damage to the cartridge.

OBJECT OF THE INVENTION The invention is to provide a cartridge-type developing device that solves the problem of the first aspect of the present invention and that replenishes and replaces developer with a simple structure without scattering the developer. The purpose is to

Structure of the Invention The present invention provides an outlet section of a developer cartridge with a magnet.
jR force action (so that it closes substantially completely,
Chronic open γ<
By inserting the developer cartridge into a developing section having a voltage of +J and forcibly opening the closed outlet section by the magnetic force of the developer cartridge, the two objectives are achieved.

DESCRIPTION OF EMBODIMENT II/II Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a side cross-sectional view of a developing device of the 11-return-torinoge type according to one example of the invention. 21 is a photosensitive drum, a part of which is shown in the figure. 22 is a typical magnetic brush developing roller as a developer carrier for conveying magnetic developer 25 to 18 corpse drum 21, and is composed of a non-magnetic cylinder 23& and a magnet roll 23b, both of which are ;) The magnetic developer 25 is conveyed by rotating at a speed of 1''. A developer cartridge 24 is filled with a magnetic developer 25 in advance.

This developer cartridge 24 is at least one of them.]
The surrounding area is made up of flexible members, and part 1"
are configured to be closed by the magnetic force of opposing magnets 26. 27 is a set supporter for the developer car 1-'J nozzle 24, and its tip 2A 2L is a set support for the developer car 1-'J nozzle 24.
The closed outlet of the IJ nozzle 27 is forcibly opened. The entire set support 27, or at least its tip gls 27a, is made of a magnetic material for reasons described later. FIG. 4 shows a state in which the developer cartridge 24 is not set, and the developer cartridge 24 is pressed against the force surface indicated by the arrow Guided by the till plate, the tip of the seven-pronged support body ηt(
At 2 completion a, the outlet of the cartridge 24 is opened. In addition,
The members described up to t'L extend sufficiently in the axial direction of the magnetic brush developing roller 22, that is, have a length corresponding to a predetermined developing size.

Next, FIG. 6 shows the outlet chair 1 of the developer cartridge 24.
It shows an enlarged side cross-sectional view of the main parts of the area; As in FIG. 4, the outlet is shown in a closed state due to the magnetic force of the magnet 26. Magnet 26ba! A: The reprints are continuously reprinted to be equal to the length of the exit in the longitudinal direction so that they attract each other. In the figure, it is composed of a pair of magnets 26, but one may be a magnet and the other may be a magnetic plate, and they do not necessarily need to be provided consecutively. The magnet 26 is the car 1-I.
It may be provided inside the J edge 24 instead of outside. In short, the outlet of the developer cartridge 24 is substantially closed by the magnetic force, and the developer cartridge 24 filled with the developer 2
It is sufficient if the structure is such that 5 does not fall out.

Then, by magnetically closing this outlet, the magnetic developer 25 that would otherwise be spilled from the small gap at the outlet is attracted by the magnetic force, thereby preventing it from falling out of the cartridge 24. Nachi ζ, 2
Reference numeral 8 denotes a doctor blade.Next, the state when the developer cartridge 24 is completely set in the set support 27 will be described with reference to FIG. 6, which shows an enlarged side cross-section of the main part. The outlet of the developer cartridge 24 is pushed open by the magnetic tip portions 27& of the set supports 2γ arranged at regular intervals, and the magnetic developer 2
The magnetic plan development roller 22 is supplied from the opened 14 cigarettes of 5 cigarettes. FIG. 7 shows the state of the magnetic lines of force of the pair of magnets 26 provided at the outlet of the developer car ridge 24 in this state. Vrll 272L
The strength of the magnetic W at the interval is weakened by the magnetic tip 27a, so the magnetic developer smoothly flows out through this interval of the cartridge 24.
The distance between the lid portions 272L is determined by the strength of the magnetic field of the magnet 26. Moreover, this magnetic body 27a is a magnet 26
, l: It is desirable that the shape is sufficiently large.

Next, a case will be described in which the cartridge 24 is pulled out from the support 2γ with a small amount of the magnetic developer 13 remaining in the developer cartridge 24. 8th Ln1
(Developer cartridge 24 in cases like this)
An enlarged side sectional view of the main part is shown.

At the outlet of the cartridge 24, a magnetic developer is sandwiched.
It is pulled out in the state 9 of 1, but the exit part (/rc installed (
Since the cartridge 2 is held by the magnetic force of the magnet 26,
Even if some magnetic developer 25 remains in the cartridge 24 when the cartridge 4 is replaced, it will not fall to the surrounding area. FIG. 9 shows the descending of the magnetic force lines of the magnet 26 when the cartridge 24 is pulled out from the set support 27. It is decided that I will remain at 27.

Here, in this embodiment, an example using the magnetic opening member, that is, the magnetic tip portion 27a of the seven-node support 27 was explained.
The state of the magnetic lines of force of the magnet 26 when it is constructed of a non-magnetic material will be explained with reference to FIG. 10. Tip part 27b' (il-
Because it is a non-magnetic material, (the lines of magnetic force are concentrated in the center)
It is stronger (
It is possible that the itching will concentrate in a specific area. Therefore, when the opening members of the cartridge 24 are made of a non-magnetic material, the intervals between the opening members must be wide.

Next, the desired shape of the magnetic distal end 27a of the magnetic opening member, here the central support 27, will be explained with reference to FIG.
7a has an edge portion 27c as shown in FIG.
Would you rather not face them close together?": Yes. As shown in the same figure, the booster is generally concentrated at the edge of the ELL pot body, so if the edge 27C faces each other at a narrow interval, the strong magnetic W generated at the edge 27c will cause the magnetism to increase. This is because the developer forms a bridge and prevents the developer from flowing out in a slurry manner. Therefore, Figure 6! As shown in FIG. 7, etc., it is important that the tips 1 to 1 (the opposing surface of 27a) have a rounded shape without an enone.

Effects of the Invention As described above, according to the present invention, a developer cartridge filled with magnetic developer and whose outlet portion is formed to be substantially closed by magnetic force, and this developer cartridge are set. The developing device is equipped with a magnetic opening means for forcibly opening the closed outlet section of the developer cartridge due to the magnetic force when the developer cartridge is opened. Because it is attracted, it is possible to prevent the magnetic developer from scattering, and also to smoothly replace and convert the developer.

[Brief explanation of the drawing]

Figure 1 shows the schematic configuration of a conventional general electrophotographic copying machine 1z
1, Figures 2 and 3 (d) Conventional cartridge type (
FIG. 4 is a side sectional view of the developing device showing an example of the invention, FIG. 5 is an enlarged sectional view of the main part, and FIG. An enlarged side cross-section of the acid part showing the set state, Fig. 7 is a diagram showing the state of the magnetic field lines of the magnet, Fig. 8 is a diagram explaining the state of the developer cartridge in the same state, and Fig. 9 is a diagram in the same state. Figure 10 shows the magnetic field lines of a magnet when the open part is made of a non-fR material, and Figure 11 shows the state of the magnetic field lines when the open part is made of a non-fR material. It is a figure which shows the state of the magnetic field lines of a magnet when 21...Photosensitive drum, 22...Magnetic plan development roller, 24...Developer cartridge, 2
5-... Magnetic 13f agent, 26... Magnet,
27-... Set support, 272L... Magnetic tip of set support. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 5 Figure 9 2.5

Claims (3)

[Claims] (1) A developer cartridge filled with magnetic developer whose outlet portion is formed to be substantially closed by magnetic force, and when this developer cartridge is set, the developer cartridge is closed by magnetic force. A developing device comprising a magnetic material opening means for forcibly opening an exit portion of the state. (2) The developing device 6 according to claim 1, head circumference (1), in which the opening means of the lid bodies are arranged opposite to each other, and the opposing surfaces have a rounded pleated shape without edges.゜ (3) The means for releasing the magnetic material is the outlet H of the developer cartridge.
The developing device according to claim 1 or 2, wherein the developing device has a shape wider than that of the magnet B.