JPH0429267A - Developing part sealing method - Google Patents

Abstract

PURPOSE:To prevent toner from dropping and scattering when a sealing member is detached by sealing a gap between the leading edge of a doctor blade and a magnet roll, and the gap between the inner side of an opening part and the magnet roll by a sealing member. CONSTITUTION:1st gaps 55 which are respectively set on the upper and lower parts between the opening part 53 which is protrusively provided on the side surface of a housing part 50 and the magnet roll 51 arranged in the opening part 53, and a 2nd gap 56 which is set between the magnet roll 51 and the leading edge of the doctor blade 54 are respectively sealed by the sealing member 16 molded of a resin material provided with elasticity. Then, developer 13 can be prevented from leaking from the gap 56 between the magnet roll 51 and the doctor blade 54 with being influenced by the vibration and the shock which occur in carrying the developer to the developing part, and the developer 13 can be prevented from adhering on the surface of the magnet roll 51 in front of the doctor blade 54. Thus, the developer 13 is prevented from dropping and scanning when the sealing member 16 is detached, so that operator's hands and the table are prevented from being soiled.

Description

[Detailed Description of the Invention] [Summary] To prevent toner from scattering when the seal is removed, regarding a developing unit sealing method for sealing a gap between a magnet roll and a doctor blade and a gap between a magnet roll and an opening in a developing unit. The purpose of the present invention is to provide a developing unit sealing method that can accommodate magnetic material powder or a powdered developer containing magnetic material powder, and a storage unit having a stirrer that stirs the developer material by rotation. , a magnetic roll that is disposed vertically with a first gap in between in an opening protruding from the side surface of the storage portion, rotates in parallel with the agitator, and adsorbs the developer stirred by the agitator; , a doctor blade whose tip faces the magnet roll with a second gap in between, and which regulates the thickness of the developer attracted to the magnet roll;
In a developing section that develops an electrostatic image formed on an image forming body with a developer attracted to a magnetic roll, a second gap and a first gap on the opposite side to the second gap have elasticity. This is a method of sealing each with a sealing material made of resin material.

[Industrial application field]

The present invention relates to a sealing section of a developing section of an electrophotographic printing apparatus, and more particularly to a developing section sealing method for sealing a gap between a magnet roll and a doctor blade and a gap between a magnet roll and an opening in the developing section.

In recent years, with the development of office automation, there has been an increasing demand for character image information output devices that can use plain paper, have low noise, and produce beautiful prints.

For this reason, copying machines, facsimile machines, etc. that utilize electrophotographic technology have been provided, but the developing devices and recording units of these small devices are treated as consumables and are sold separately.

The developing device and recording unit are filled with toner and sealed to prevent it from scattering during transportation, but the toner scatters when the seal is removed, making it easy for users to handle and excellent for mass production. A toner seal method is desired.

[Conventional technology]

FIG. 4 illustrates an internal side view of the electrophotographic printing apparatus. In the figure, 1a is an optical scanning unit + 2a is a photosensitive drum,
3 is a cleaner, 4 is a charger, 5a is a developer, 6 is a transfer section, 7 is a static eliminator, 8 is a fixing device, 9 is a transport path, 10a,
10b is a paper supply unit that stores recording paper 12 according to size;
11 indicates stun power.

With this configuration, when the power of the apparatus is turned on, the roller l? 1 is heated to a predetermined temperature by the heater lamp 80 and becomes ready for printing.

Therefore, based on the print instruction signal, the paper supply units 10a, 10
A recording paper 12 of a specified size is fed out in the direction of arrow A from one of the paper sheets 1 and 2a, and is conveyed along the conveyance path 9 to the photosensitive drum 2a.
Send it upwards. By this time, the photosensitive drum 2a has been removed by the static eliminator 7.
The charge is removed by the cleaner 3, and the toner 13a is cleaned by the cleaner 3, and then charged again by the charger 4.

Light data irradiated from an optical scanning section 1a constituted by a laser light source or the like is scanned onto a photosensitive drum 2a, and the electrostatic image formed on the photosensitive drum 2a is developed into a toner image by a developing device 5a, and transferred to a transfer section 6. After being transferred onto the recording paper 12, the toner 13a is conveyed to the fixing device 8 while being sandwiched between a fixing roller R1 and a pressure roller R2, where the toner 13a is heated and pressurized, fixed, and discharged.

Here, the developing device 5a is configured as a unit by integrating a toner storage portion 50a and a developing roll 51a, and is configured to be detachably set in the apparatus. This may be necessary to perform maintenance in case of a malfunction or to remove the toner 13 in the toner storage section 50a.
This is because each unit is replaced when a is used up. The toner 13a is a developer composed of magnetic material powder 1, for example, mainly iron oxide powder, and is charged by stirring. The toner 13a includes a magnetic powder component and a two-component mixture of magnetic powder and non-magnetic powder.

FIG. 5 shows an enlarged side sectional view of the developing device 5a before being set in the apparatus. The toner storage portion 50a includes a toner 13a inside, a stirrer 52a for stirring the toner 13a, and an opening 5 provided on the upper side surface over almost the entire length in the longitudinal direction.
3a and a doctor blade 54a, and the opening 53
A developing roll 51a formed of a magnet is disposed vertically in the space a with a gap G1 therebetween.

A cap 14 is fitted to the front surface of the opening 53a. The cap 14 has a sealing material 16a formed of an elastic resin material 1, such as rubber, inside the cover 15.

16b, and sealing materials 16a and 16b seal the gap Gl, respectively.

Therefore, when the developing device 5a is set in the apparatus, the cap 14 is first removed and then the developing roller 51a is connected to a drive mechanism (not shown). When the device is driven, the agitator 52a rotates in conjunction with the rotation of the developing roll 51a, and the toner 13a is attracted to the developing roll 51a, and the toner is removed by the tip of the doctor blade 54a, which is positioned on the developing roll 51a with a predetermined gap G2. 13a
The thickness of the film is regulated to be constant (for example, 20 μm) and used for development.

Further, as a different sealing method, as shown in FIG. 6, a plate-shaped seal member 16c is provided behind the developing roll 51a.
Attach the developing roll 51a and the toner 13a separately, and attach the end perpendicular to the drawing to the toner storage section 50b.
It is placed outside the room and is picked and pulled out when it is used.

[Problem to be solved by the invention]

According to the conventional method described above, ■In the method shown in Figure 5, toner leaks to the outside of the doctor blade due to vibrations and shocks during transportation, adheres to the surface of the developing roll, and when the user removes the seal cap. , toner spills and stains your hands, desk, etc. In addition, when a printing test is carried out before shipping at a developing unit manufacturing factory, when the printing test is carried out, the toner is magnetically attached to the developing roll, so when the seal cap is removed, the negative layer toner is removed. It becomes easy to spill.

■In the method shown in Figure 6, when performing a printing test before shipping, clean the toner on the developing roll after the test.

And, the toner must be taken out from the toner filling section, sealed with a sealing member, and then refilled with toner.
Lack of mass production.

There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a developing unit sealing method that can prevent toner from scattering when the seal is removed.

[Means for Solving the Problems] Fig. 1 is a diagram showing the principle of the present invention, in which (a) is a side sectional view of the developing section;
(b) shows a sealed developing section. In the figure, 2 is an image forming body, 5 is a developing section, 13 is a developer, 50 is a storage section, 5
1 is a magnet roll, 52 is a stirrer, 53 is an opening,
54 is a doctor blade; 55 is an opening 5 provided protruding from the side surface of the housing portion 50;
3 and a magnet roll 51 disposed within the opening 53
56 is a second gap set between the magnet roll 51 and the tip of the doctor blade 54, and 16 is a sealing material made of an elastic resin material. be.

Second gap 56. and a method in which the first gap 55 on the opposite side to the second gap 56 is sealed with the sealing material 16, respectively.

[Effect]

Magnet roll 5 of storage section 50 containing developer 13
1 and the doctor blade 54, and the first gap 55 on the opposite side to the second gap 56, the sealing material 16 is inserted and sealed, respectively. The developer 13 becomes magnetized due to vibrations and shocks during transportation.
Since the developer 13 does not leak from the gap G2 between the troll 51 and the doctor blade 54, and therefore the developer 13 does not adhere to the surface of the magnet roll 51 in front of the doctor blade 54,
When the seal 15 is removed, the developer 13 does not fall or scatter, and it is possible to prevent hands, desks, etc. from getting dirty.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to Figs. 2 and 3. The same reference numerals indicate the same objects throughout the figures.

Photosensitive drum 2a, developing device 5b, toner 13a, shown in FIG.
Toner storage section 50a, developing roll 51a1 gaps Gl, G
2 is the image forming body 2 of FIG. Developing section 5. Developer 13. Accommodation section 50. Magnet roll 51. First gap 55. They correspond to the second gaps 56, respectively.

FIG. 2 shows a side sectional view of an embodiment in which the present invention is applied to the developing unit of the electrophotographic printing apparatus described in the conventional example. As shown in the figure, in the developing device 5b before being set in the apparatus, a gap G2 between the tip of the doctor blade 54a and the developing roll 51a is formed by a sealing material formed in a spongy shape using an elastic resin material.
It is sealed with 6d.

Further, a gap G1 between the developing roll 51a on the opposite side to the gap G2 and the opening 53a is sealed with a seal 16e made of the same material as the sealing material 16d.

The sealing method is to provide a plurality of screw holes 57 near the base of the protruding opening 53a, and to insert a plurality of screws 5 from the screw holes 57.
8 to press the sealing materials 16d and 16e to create a gap G2.
Gl is sealed.

Next, a sealing method after the test will be explained with reference to FIG. 3 when the developing device 5b is subjected to a printing test at a manufacturing factory before being shipped.

(3) As shown in 3D (a), the toner 13a was adsorbed to almost the entire surface of the developing roll 51a after the test.

■First, as shown in Figure 3 ~), the doctor blade 5
4a and the developing roll 51a with the sealing material 1.
Seal with 6d.

(2) Next, the developing roll 51a is rotated approximately once in the direction of the arrow, and the toner 13a adsorbed on the developing roll 51a is removed by the sealing material 16d pressing the developing roll 51a.

(2) Then, the gap G1 on the opposite side to the gap G2 is sealed with a sealing material 16e.

By sealing in this manner, the toner 13a is transferred to the developing roller 5 due to vibrations and impacts during transportation of the developing device 5b.
Since the toner 13a does not leak from the gap between the doctor blade 54a and the doctor blade 54a, and the toner 13a does not adhere to the surface of the magnet roll 51a in front of the doctor blade 54a,
When seals 15d and 15e are removed, toner 5
2a does not fall or scatter, and it is possible to prevent hands, desks, etc. from getting dirty.

In addition, when shipping after printing tests, it eliminates the hassle of cleaning the developing roll after the test, taking out the toner from the toner filling section, sealing it, and then refilling it with toner, improving mass productivity. do.

〔Effect of the invention〕

As explained above, according to the present invention, by sealing the gap between the tip of the doctor blade and the magnet roll, and the gap between the inside of the opening on the opposite side to the gap and the magnet roll with a sealing material, the developing section Toner will not leak from the gaps due to vibration or shock during transportation, so toner will not fall or scatter when the seal material is removed.
This prevents your hands and desk from getting dirty, and when you perform a printing test on the developing section before shipping, you can clean the magnet roll and seal the toner storage section after the printing test is completed, then refill the toner again. This has the effect of saving time and effort and improving mass productivity.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of the present invention, Fig. 2 is a side sectional view showing an embodiment of the invention, Fig. 3 is an explanatory diagram of the embodiment, Fig. 4 is an internal side view of an electrophotographic printing device, and Fig. 5 is a side sectional view showing an embodiment of the invention. The figure is a side sectional view showing a conventional example, and FIG. 6 is a side sectional view showing a different conventional example. In the figure, 2 is an image forming body, 2a is a photosensitive drum, 5 is a developing section, 5a and 5b are developing devices, 13 is a developer,
13a is toner 16, 16a, 16b,
16d and 16e are sealing materials, 16c is a sealing member, 50 is a storage section, 50a and 50b are toner storage sections, 51 is a magnet roll, 51a is a developing roll, 53.
53a is an opening, 54, 54a is a doctor plate 5
5 is a first gap, 56 is a second gap, G1. G2
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Claims (1)

[Scope of Claims] 1) Contains powder of a magnetic material or a powder developer (13) containing the powder of the magnetic material, and rotates the developer (13).
a housing section (50) having a stirrer (52) for stirring;
An opening (
53) with first gaps (55) in between, and rotates in parallel with the stirrer (52) to rotate the stirrer (52).
a magnet roll (51) that adsorbs the developer (13) stirred by the magnet roll (52); and a doctor blade (54) that regulates the thickness of the developer (13) adsorbed on the magnetic roll (51), which controls the electrostatic image formed on the image forming body (2). In the developing section (5) that performs development with the agent (13), the second gap (56) and the first gap (55) on the opposite side to the second gap (56) are filled with an elastic resin. A developing unit sealing method characterized in that each developing unit is sealed with a sealing material (16) made of a material. 2) The second gap (56) is filled with an elastic sealing material (
16), the magnet roll (51) is rotated by a predetermined angle, and then the first gap (55) on the opposite side to the second gap (56) is sealed with the sealing material (
16) The developing unit sealing method according to claim 1, wherein the developing unit is sealed by step 16).