JPS6199178A - Developing machine using magnetic brush - Google Patents

Abstract

PURPOSE:To prevent magnetic power from flowing out to the bearing side and to prevent the bearings from being fixed by arranging a magnet ring between a magnet roll 1 and the bearings on both the sides in addition to a V-shaped rubber ring. CONSTITUTION:The magnet roll 1 to be optionally rotated in its peripheral direction is supported by the bearings 2. The V-shaped rubber ring 5, an inner magnetic ring 7 and an outer magnetic ring 8 are arranged between the magnet roll 1 and the bearings 2. The magnetic powder can not be reached to the bearings 2 because of the existence of a magnetic field formed by both the rings 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a magnetic brush developing machine for an electrophotographic recording device.

[Conventional technology]

Conventionally, there was a device of this type as shown in FIG. 3. In FIG. 0, 1 is a magnet roll, 2 is a bearing bearing, 3 is a side plate of the main body of the developing machine, and 4 is a bearing 2 attached to the side plate 3. 5 is a V-shaped rubber ring, 6 is magnetic powder, and the size is usually 5μ.
m to 300 μm.

Next, the operation will be explained.

The magnet roll 1 is supported at both ends by bearings 2 and can freely rotate in the circumferential direction. Further, the bearing bearing 2 is held by a bearing holding ring 4 and is attached to a side plate 3 of the main body of the developing machine.

Further, a V-shaped rubber ring 5 is provided between the magnet roll 1 and the bearing 2, which allows the magnetic powder 6 to
This prevents the liquid from flowing toward the bearing 2.

[Problem that the invention seeks to solve]

The conventional device is configured as described above, and the magnetic powder 6
Since the structure is such that only the ■-shaped rubber ring 5 prevents the IJ3 from moving toward the bearing 2, the leakage is prevented! The performance was insufficient.

Therefore, there was a problem in that the magnetic powder 6 entered the bearing 2 and the bearing 2 became fixed.

The present invention was made to solve these problems, and an object of the present invention is to provide a magnetic brush developing machine that can prevent magnetic powder from flowing out to the bearing side.

[Means for solving problems]

The magnetic brush developing machine according to the present invention is provided with a magnet ring in addition to a V-shaped rubber ring between a magnet roll and bearings supporting the roll on both sides thereof. [Function] In this invention, magnetic powder from the magnet roll flows out toward the bearing side, but part of it is prevented from entering the bearing side by the V-shaped rubber ring and the rest by the magnet ring. be done.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 shows a magnetic brush developing machine according to an embodiment of the present invention. In FIG. 1, 1 is a magnet roll that can freely rotate in the circumferential direction, 2 is a bearing that supports the roll 1, and 3 is a bearing bearing that supports the roll 1. A side plate of the main body of the developing machine, 4 is a bearing holding ring for holding the bearing 2 and attaching it to the side plate 3, 6 is a magnetic powder, and 5 is provided between the magnet roll l and the bearing 2. This is a V-shaped rubber ring, which is used to prevent the magnetic powder 6 from flowing out toward the bearing 2. 8 is a bearing retaining ring 4 between the V-shaped rubber ring 5 and the bearing 2.
The outer magnetic ring 7 is held by the outer magnetic ring 8.
is an inner magnetic ring fixed to the magnet roll shaft 1a facing the magnet roll 1, which rotates together with the magnet roll 1, and both of the opposing surfaces of the rings 8.7 are N
It's extreme.

Next, the operation will be explained.

The V-shaped rubber ring 5 prevents the magnetic powder 6 from flowing out to the bearing 2 side to some extent, but it is not enough, so the magnetic powder 6 flows out slightly. This is prevented by the inner magnetic ring 7 and the outer magnetic ring 8.

That is, as shown in FIG. 2, the inner magnetic ring 7 and the outer magnetic ring 8 are arranged so that their opposing surfaces have the same polarity, and the magnetic powder 6 entering the ring 7. The magnetic powder produced by the magnetic particles 8 repel each other and cannot enter the inside, and the magnetic powder never reaches the bearing 2. Therefore, the hair ring bearing 2 becomes clogged with magnetic powder.
There will be no more sticking.

In this way, in this embodiment, the ingress of magnetic powder that was not blocked by the ■-shaped rubber ring 5 is blocked by the magnetic field created by the outer ring 7.8, which is provided in front of the bearing 2. The permeable powder will not enter the bearing 2 side, and the bearing 2 will not stick.

In the above embodiment, the north poles of the inner and outer image rings are opposed to each other, but the same effect can be obtained even if the south poles are opposed to each other.

〔Effect of the invention〕

As described above, according to the present invention, since the magnet ring is provided in addition to the V-shaped rubber ring between the magnet roll and the bearings on both sides, it is possible to prevent the magnetic powder from flowing out to the bearing side. This has the effect of preventing the bearing from sticking.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the area around the bearing of the magnet roll of a magnetic brush developing machine according to an embodiment of the present invention, FIG. This is a cross-sectional view of the vicinity of the bearing of the magnetic roll of the machine. 1 is the magnet roll, 1a is the shaft of the magnet roll, 2 is the bearing bearing, 4 is the bearing retaining ring, 5 is the V-shaped rubber ring, 6 7 is a magnetic powder, 7 is an inner magnetic ring (inner ring), and 8 is an outer magnetic ring (outer ring). In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A magnetic brush developing machine for an electrophotographic recording device, in which a V-shaped rubber ring is provided on the roll side between a magnet roll and bearings that support the roll on both sides, and A magnetic brush developing machine characterized in that a magnet ring is provided on the bearing side to prevent the magnetic powder that has passed through the V-shaped rubber ring from moving to the bearing side. (2) The magnet ring has an outer ring fixed to a bearing holding ring that holds the bearing, an inner ring fixed to the shaft of the magnet roll, and opposing surfaces of both rings having the same polarity. A magnetic brush developing machine according to claim 1, characterized in that: