JPH03189666A - Developing device - Google Patents

Abstract

PURPOSE:To prevent the generation of the lumps of a developer by independently disposing a sealing member and a bearing member and using respectively nonmagnetic metals for these members, thereby improving the sealability of the developer. CONSTITUTION:A revolving shaft 3 is held in tight contact with an inner sealing part 8 of an oil seal 6 fixed to the mounting hole of the side plate of a developer container 1 and revolves while rubbing with the sealing part 8. The oil seal 6 presses the revolving shaft 3 by a elasticity of rubber to seal the developer in the developer container 1. The sealing force of the oil seal 6 weakens when the pressure of the developer acts on the tight contact surfaces of the oil seal 6 and the revolving shaft 3, but a ring 7 consisting of the nonmagnetic metal is embedded in the oil seal 6 in this case and, therefore, the strong sealing force is maintained. The oil seal and a bushing do not receive the influence of the magnetic field in the developer container 1. The oil seal 6 does not, therefore, suck the developer and does not generate the lumps of the developer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device that performs development using a magnetic developer.

[Prior Art] Conventionally, the rotation shaft of the stirring member disposed in the developing device is the sixth
The support method shown in the figure is used. In FIG. 6, a pusher 4, which is a bearing member, is fitted into the inner diameter of a mounting hole 5 formed in the side plate of the developer container 1, and supports the rotating shaft 3.

The bushing 6 is a non-metallic member and also has a rust hole for sealing the developer 2.

[Problem to be solved by the invention] However, with the support and seal only by the bushings,
The non-metallic lashes are likely to wear out due to the sliding friction with the rotating shaft, reducing the supporting force, and furthermore, the sealing force is also reduced due to the worn gap. Therefore, in order to avoid J9 wear, it has been proposed to use a metal bearing, such as a rolling bearing, in the support portion. However, although wear is reduced, magnetic fields and magnetic grains are attracted to the magnetic metal bearings, which worsens the fluidity of the developer near the support and accelerates the deterioration of the developer. Clumps of developer tend to form due to rubbing near the area, and the clumps of developer mix with other developers. As a result, there have been problems in that the above-mentioned lumps cause malrotation of the rotating shaft, or that the lumps get stuck in the gap between the developer carrier and the developer regulating member, affecting the image. Furthermore, there is a problem in that transfer defects occur due to deterioration of the developer.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a developing device that reliably seals the developer and supports the rotating shaft without deteriorating the fluidity of the developer around the support portion.

[a! ! Means for Solving the Problem] According to the present invention, the above object is as follows: A developing device comprising: a stirring member that is rotatably disposed with a rotating shaft inside the container and that stirs the developer in the developer container and transports the developer to the developer carrier side; A metal bearing member disposed on the inner diameter of the mounting hole for the rotating shaft formed on the side plate of the developer container and the two-legged mounting hole are sealed on the inner side of the developer container than the bearing member. This is achieved by comprising a sealing member, the L leg support member and the sealing portion being made of a non-magnetic material. Further, a developer container having an opening at the front, a developer carrier disposed in the opening and containing a magnetic field generating means, and a rotary shaft rotatably disposed inside the developer container. A developing device comprising a stirring member that stirs the developer in the developer container and transports the developer to the developer carrier side, a mounting for the rotating shaft formed on a side plate of the developer container. A metal bearing member disposed on the inner diameter of the hole, and a sealing member for sealing the mounting hole on the inner side of the developer container than the bearing member, and the L foot mounting hole is provided on the inner wall surface of the side plate. This can also be achieved by comprising a net that connects a portion with a diameter larger than the inner diameter of the seal member and a portion at a predetermined distance from the inner wall surface and covers the seal member.

[Function] According to the present invention, a bearing member made of non-magnetic metal is disposed on the inner diameter of the mounting hole for the rotating shaft formed in the side plate of the developer container, and a bearing member made of a non-magnetic metal is provided inside the container than the bearing member. A sealing member made of a non-magnetic material is provided to seal the mounting hole. Therefore, since the bearing member is made of metal, it has good wear resistance and reliably supports the rotating shaft. Furthermore, since it is non-magnetic, it will not be magnetized by the magnetic field generating means, and since a seal member is disposed inside, there is no accumulation of developer around the support portion of the bearing member, and no developer lumps are generated.

Further, since the sealing member is also a non-magnetic member, it is not magnetized by the magnetic field generating means and does not attract developer to the portion where it rubs against the rotating shaft, thereby preventing the generation of developer lumps.

Furthermore, even if the bearing member and seal member are made of magnetic material,
If a magnetic metal mesh is provided on the inner wall surface to cover the sealing member, when the mesh is magnetized by the magnetic field generating means, the developer will be attracted to the area around the mesh, and the area where the seal and the rotating shaft rub together will be Do not concentrate the developer. Further, since the seal portion is surrounded by a net, the developer is prevented from entering the rubbing portion. Therefore, no lumps of developer are generated in the rubbing portion.

[Embodiments] First to third embodiments of the present invention will be described based on FIGS. 1 to 5 of the accompanying drawings.

(First Embodiment) In FIG. 1, l is a developer container containing a magnetic developer 2. Inside the developer container l is a stirring member (Fig. (not shown), and a non-magnetic metal bush 4 serving as a bearing member supporting the rotating shaft 3, or a mounting hole 5 formed in the side plate of the developer container L described in F, is provided on the inner diameter thereof. An oil seal 6, which is a sealing member, is disposed inside the developer container l from the bushing 4 and contacts the rotating shaft 3 to seal the mounting hole 5 shown in FIG.

FIG. 2 is an enlarged view of the oil seal 6.

The oil seal 6 is made entirely of rubber and is reinforced by a non-magnetic metal ring 7 embedded therein. The non-magnetic metal link 5 is necessary to improve the accuracy of the inner seal portion 8 of the oil seal 6.

In the apparatus of this embodiment as described above, the rotating shaft 3 rotates while being supported by the bushing 4. The rotating shaft 3 is in close contact with an inner seal portion 8 of an oil seal 6 fixed to a mounting hole in a side plate of the developer container 1, and rotates while rubbing against the seal portion 8. The oil seal 6 presses the rotating shaft 3 due to the elasticity of rubber and seals the developer in the developer container l. At this time, if the pressure of the developer is applied to the contact surface between the oil seal 6 and the rotating shaft 3, the sealing force of the oil seal 6 will be weakened. In this embodiment, a non-magnetic metal link 7 is embedded inside the oil seal 6. 1. Maintain strong sealing force. Also,
Since both the oil seal and the fish are made of non-magnetic metal, they are not affected by the magnetic field generated by the magnetic field generating means in the developer container l. Therefore, the oil seal 6 does not attract the developer, and the flow of the developer is maintained well without being restricted at the sliding contact portion between the oil seal 6 and the rotary shaft 3, and no lumps of developer are generated.

Next, we will discuss the third part of the experiment conducted using this example device.
This will be explained using figures. The developer 2 shown in FIG. 3 has an average particle size of 50. LLI ferrite carrier and average grain size 1
2 μm polyester resin toner particles with a m2 ratio of 10
: A mixture of 1 was used.

In addition, as a magnetic field generating means, S+=800c, N,
A four-pole Macnet roller 9 of = 600G, 52 = 600G, and N2 = 800G was used, and a non-magnetic sleeve N, which was a developer carrier, was made of aluminum and had a diameter of 2 hm. Furthermore, as a stirring member, the pitch is 20m.
A stainless steel screw 11 made of a non-magnetic metal with a diameter of 1.5 mm and a stainless steel round bar with a diameter of 8 cm were used as a rotary shaft 3, and the screw 11 was rotated at 320 rpm.

As a result, it was confirmed that there was no leakage of developer due to the sealing effect described above, and that no lumps of developer were formed around the support portion of the rotating shaft.

Second embodiment> Next, a second embodiment of the present invention will be described using FIG. 4.

Note that the same reference numerals are given to the same parts as in the first embodiment, and the explanation thereof will be omitted.

As shown in Fig. m4, this embodiment differs from the first embodiment in that a non-magnetic metal ball bearing 12 is used as the bearing member instead of a non-magnetic metal bush. According to this embodiment,
Although the same effects as in the first embodiment are achieved, the wear of the support part due to rotation is reduced, and the durability of the seal can be improved.

<Third Embodiment> Next, a third embodiment of the present invention will be described using FIG. 5. Note that the same parts as in the first embodiment are given the same reference numerals and their explanations will be omitted.

In this example, in order to prevent the magnetic field from concentrating around the support part,
This embodiment differs from the first embodiment in that a magnetic metal mesh I3 as shown in FIG. 5 is attached to surround the sealing member. The net 13 connects a portion of the inner wall surface of the side plate having a diameter larger than the inner diameter of the mounting hole 5 and a portion at a predetermined distance from the inner wall surface,
Covers the seal member.

In this embodiment, even if both the sealing member and the bearing member are made of magnetic metal, the mesh 13 prevents the developer from entering, and the mesh 13 is magnetized so that the developer does not flow around the mesh 13. Since the pressure is concentrated, the pressure that is currently applied to the seal area is not applied. Therefore, the same effects as the first embodiment can be achieved. Note 1. The mesh body is not limited to a magnetic member, but may also be a non-magnetic member. [Effects of the Invention] As explained above, the present invention arranges the seal member and the bearing member independently, and uses non-magnetic metal members for each. This improves the sealing properties of the developer, and by improving the sealing properties, it is possible to prevent the formation of lumps of the developer caused by rubbing at the sealed portion of the developer, thereby preventing deterioration of the developer.

Further, even when the sealing member and the bearing member are made of a magnetic material, the same effect as described above can be produced by covering the sealing member with the net.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the vicinity of the support part of the rotating shaft of the device according to the first embodiment of the present invention, Fig. 2 is an enlarged view of the sealing member of the device shown in Fig. 1, and Fig. 3 is a cross-sectional view showing the area around the support part of the rotating shaft of the device according to the first embodiment of the present invention. A cross-sectional view of the developing device. FIG. 4 is a cross-sectional view showing the vicinity of the support portion of the rotating shaft of the second embodiment of the device of the present invention. FIG. 5 is a cross-sectional view showing the vicinity of the support portion of the rotating shaft of the third embodiment of the device FIG. 6 is a sectional view showing the vicinity of a support portion of a rotating shaft of a conventional device. l...Developer container 2...Developer 3...Rotating shaft 4...Rush (bearing member) 5...Mounting hole 6 ...Seal member (oil seal) 12...
... Ball bearing (bearing member) 13 ... Net body

Claims (2)

[Claims] (1) A developer container having an opening in the front, a developer carrier disposed in the opening and containing a magnetic field generating means, and a rotary shaft rotatably disposed inside the developer container. and a stirring member for stirring the developer in the developer container and transporting the developer to the developer carrier side, wherein the rotating shaft is formed on a side plate of the developer container. It includes a metal bearing member disposed on the inner diameter of the mounting hole, and a sealing member that seals the mounting hole on the inner side of the developer container than the bearing member, and the bearing member and the sealing part are non-magnetic. A developing device characterized by being formed of a member. (2) A developer container having an opening at the front, a developer carrier disposed in the opening and containing a magnetic field generating means, and a rotary shaft rotatably disposed inside the developer container. and a stirring member for stirring the developer in the developer container and transporting the developer to the developer carrier side, wherein the rotating shaft is formed on a side plate of the developer container. A metal bearing member disposed on the inner diameter of the mounting hole, and a sealing member for sealing the mounting hole on the inner side of the developer container than the bearing member, and the mounting hole is sealed on the inner wall surface of the side plate. A developing device comprising: a net member connecting a portion having a diameter larger than an inner diameter of the developing device and a portion having a predetermined distance from the inner wall surface and covering the sealing member.