JPH0731450B2 - Developer agitator of developing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developer stirring device in a developing machine of a copying machine.

2. Description of the Related Art A developing machine using a two-component developer forms a thin layer of developer on a magnet roll with a trimmer plate to a predetermined layer thickness, and the excess developer is mixed onto a mixing plate. It is falling on the blender along the way.

This mixing plate has a function of uniformly dropping the developer along the axial direction of the magnet roll.For example, a large number of protrusions are fixed on the plate-like body, and the developer flows down along the protrusions and the The structure is such that it falls uniformly along the axial direction of the netroll.

Problems to be Solved by the Invention Since the mixing plate is only provided with the projections on the plate-shaped main body, if the level of the developing machine is slightly deviated, the developer is concentrated on one side in the axial direction of the magnet roll. Fall,
Flow rate of developer on magnetrol
Unevenness and uneven density on the copy.

This is remarkable in the case of a developing machine having a long magnetol, and in an extreme case, there is almost no developer on the magnetrol, and the copy density may be extremely lowered.

Means and Actions for Solving the Problems Adjacent to the trimmer plate 6 for removing the excess developer on the magnet roll 2, a plurality of regulating members 9 are provided on the main body 8 at intervals in the axial direction of the magnet roll 2. In the developer agitator for a developing machine, in which the provided mixing plate 7 is disposed, the regulating member 9 extends downward along an upper wall 10 parallel to the main body 8 and one opposing edge 10a of the upper wall 10. A side wall 12 provided and fixed to the main body 8 and a regulation plate 14 provided upward along the other opposite edge 10a of the upper wall 10 are provided, and the side wall 12 and the regulation plate 14 are virtual. A developer stirring device for a developing machine, which is formed at an angle where extension lines intersect with each other and has a space 20 having an inlet 18 and an outlet 19 between the upper wall 10 and the main body 8.

As a result, the excess developer removed by the trimmer plate 6 flows into the space 20 from each inlet 18 of the mixing member 7,
Since it flows along the side walls forming each space 20 and drops from the outlet 19, it uniformly drops from the outlets 19 of the plurality of regulating members 9 spaced in the longitudinal direction of the main body 8 in the axial direction of the magnet roll 2. However, when a large amount of the developer flows into the space 20, a part of the developer is removed from the upper wall 10 and the regulation plate 14 of each regulation member 9.
Since it falls from the upper part of the outlet 19 of the space 20 along the direction, even if the horizontal direction of the developing machine is slightly misaligned, the developer deviated to one end side in the axial direction of the magnet roll is regulated by the regulating plate 14 in the axial center of the magnet roll 2. , The developer can be uniformly dropped along the axial direction of the magnet roll 2, and when the amount of the excess developer is large, the developer is separated into two upper and lower layers, and the developer flows and falls. Become.

Embodiment FIG. 3 is a sectional view of a developing machine, in which a magnet roll 2 is provided in a housing 1 so as to face a photoconductor 3, and a developer in the housing 1 is mixed by a blender 4 and then a paddle wheel 5 is used. Is conveyed onto the magnet roll 2, and the developer is regulated to a predetermined layer thickness by the trimmer plate 6 and then conveyed to the photoconductor 3 to perform a developing operation.

The developer removed by the trimmer plate 6 is dropped onto the blender 4 along the mixing plate 7.

As shown in FIG. 2, the mixing plate 7 has a plate-like main body 8 having a predetermined thickness and width and having a length extending in the axial direction of the magnet roll 2, and a longitudinal direction of the main body 8. A plurality of regulating members 9 are provided at intervals.

As shown in FIG. 1, the regulating member 9 has an elongated one edge.
10b and the opposite edges 10a and 10a inclined to face each other, the upper wall 10 has a substantially triangular shape, and the opposite edges 10a and 10a of the upper wall 10 and the side walls 11 and 12 that are continuous with each other have a substantially U-shaped cross section. And a regulating plate 14 provided along one edge 10a so as to be continuous with one side wall 11 of the first member 13 and project from the upper wall 10 in a plane triangular shape. , Mounting pieces 15 and 16 integrally formed on both side walls 11 and 12 are fixed to the main body 8 with screws 17,
The long end edge 10b of the upper wall 10 of the member 13 is parallel to the long end edge 8a of the main body 8 adjacent to the magnet roll 2, and the first member 13 and the main body 8 widen the inlet 18.
And a narrow exit 19 which forms a space 20 and its entrance
18 is facing the magnet roll 2 and the regulation plate 14
Is inclined with respect to the flow direction of the developer so that the inlet 18 side faces the longitudinal center portion of the main body 8 from the inlet 18 side.

That is, the regulation member 9 is symmetrical with respect to the longitudinal center of the main body 8.

Then, the excess developer removed by the trimmer plate 6 flows from the inlet 18 of the first member 13 of the mixing plate 7 into the space 20 and drops from the outlet 19, so that a plurality of the developers spaced in the longitudinal direction of the main body 8 are provided. From the outlet 19 of the first member 13, it uniformly drops along the axial direction of the magnet roll 2.

Further, when a larger amount of the developer than the height of the space 20 of the first member 13 flows in, it overflows to the upper wall 10 and drops along the regulation plate 14 toward the central portion in the axial direction of the magnet roll 2.

As a result, even when the horizontal direction of the developing machine is slightly misaligned and the developer is biased to one end side in the axial direction of the magnet roll 2 and flows into the mixing plate 7, the developer is evenly distributed in the axial direction of the magnet roll 2. Since it can be dropped and the developer flow rate on the magnet roll can be made uniform, unevenness in copy density can be prevented.

FIG. 4 is a perspective view of the second embodiment, and one edge of the upper wall 10 is shown.
The regulation plate 14 is integrally formed continuously with 10a, and the upper wall 10 is regulated by the regulation plate 1
It is inclined downward toward the 4th side and the inlet 18 side is brought into contact with the main body 8 so that the developer flows as shown by the arrow.

5 and 6 are a perspective view and a plan view of the third embodiment,
The difference from the second embodiment shown in FIG.
It is a point that is bent in a hook shape by 11a and the lateral portion 11b, the upper wall 10 is continuously formed on the lateral wall 11b, and the outlet 19 side of the one side wall 11 projects from the regulation plate 14, The agent is allowed to flow as indicated by the arrow.

By doing so, it is possible to obtain a more uniform drop and mixing performance of the developer while the main body 8 is maintained at a desired level.

Effect of the Invention The excess developer removed by the trimmer plate 6 flows from each inlet 18 of the mixing member 7 into the space 20 and each space 20 thereof.
Flows along the side wall of the main body 8 and falls from the outlet 19, so that the plurality of regulating members 9 arranged at intervals in the longitudinal direction of the main body 8 uniformly drop along the axial direction of the magnet roll 2 and a large amount. When the above developer flows into the space 20, a part of the developer is discharged along the upper wall 10 and the control plate 14 of each control member 9 into the space.
It falls from the upper part of the exit 19 of 20.

Therefore, even if the horizontal direction of the developing machine is slightly deviated, the developer biased to one end in the axial direction of the magnet roll is regulated by the regulating plate 14.
Since it can be dropped to the center of the magnet roll 2 in the axial direction,
The developer can be uniformly dropped in the axial direction of the magnet roll 2, and when the amount of the excess developer is large, the developer is separated into two upper and lower layers and the developer flows and falls, so that the miking becomes good.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a perspective view of a mixing plate, Fig. 2 is a plan view, Fig. 3 is a sectional view of a developing machine, and Fig. 4 is a perspective view of the second embodiment. 5 and 6 are a perspective view and a plan view of the third embodiment. 2 is a magnet roll, 6 is a trimmer plate, 7 is a mixing plate, 8 is a main body, 9 is a regulating member, 13 is a first
A member, 14 is a regulating plate, 18 is an inlet, 19 is an outlet, and 20 is a space.

Claims (1)

[Claims] 1. A mixing plate 7 in which a plurality of regulating members 9 are provided in a main body 8 adjacent to a trimmer plate 6 for removing an excessive developer on the magnet roll 2 at intervals in the axial direction of the magnet roll 2. In the developer agitator for a developing machine, the regulating member 9 is provided downward along an upper wall 10 parallel to the main body 8 and one opposite edge 10a of the upper wall 10, and 8 is provided with a side wall 12 fixed to the upper wall 10 and a regulation plate 14 provided upward along the other opposite edge 10a of the upper wall 10, and an angle at which a virtual extension line between the side wall 12 and the regulation plate 14 intersects. And a space 20 having an inlet 18 and an outlet 19 is formed between the upper wall 10 and the main body 8.