JPS6312352Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an electrophotographic copying system that prevents unnecessary flow of developer into the bearings at both ends of an agitation bar for stirring the developer including toner and carrier. This relates to the developing device of the machine.

Hereinafter, the present invention will be explained based on the illustrated embodiments. In FIG. 1, reference numeral 1 denotes an agitation bar for stirring the developer including toner and carrier. It is constructed by arranging a large number of blades 2 that are bent in the shape of . The shaft 3 has bearings 4 arranged at both ends.
is rotatably supported on the side wall of the developing device.
Reference numeral 5 denotes a developer entry prevention member implanted near the bearings at both ends of the shaft 3, and this member is composed of a rectangular flat piece (or blade) extending in the length direction of the agitation bar 1. has been done.

When using the agitation bar configured as described above, the developer is agitated by the blades 2 of the agitation bar and constantly moves relative to each other in the axial direction, trying to enter the bearings at both ends of the shaft. The developer in that area is stirred and moved by the developer inflow prevention member 5 in the same direction as the rotational direction of the agitation bar 1 (direction perpendicular to the axial movement), so that the developer does not enter the bearing. This can prevent the rotation of the agitation bar 1 and therefore the agitation of the developer from being impaired.

FIG. 2 shows another embodiment of the present invention, in which a disc-shaped member disposed concentrically with the shaft 3 is used as the developer entry prevention member 6 corresponding to FIG. Even if this is done, the same effect as in the case of FIG. 1 can be obtained.

As is clear from the above description, according to the present invention, it is possible to minimize the amount of developer that enters the bearing of the agitation bar when stirring the developer, thereby preventing damage to the bearing, seizure, etc. If you can do this, you can get excellent results.

[Brief explanation of the drawing]

Figure 1 is a perspective view of essential parts of an embodiment of the present invention;
The figure is a side sectional view of a main part of another embodiment of the present invention. 1...Agitation bar, 2...Blade, 3...
...Shaft, 4... Bearing, 5, 6... Developer entry prevention member.

Claims (1)

[Claims for Utility Model Registration] (1) A developing device for an electrophotographic copying machine equipped with an agitation bar for agitating a developer including toner and a carrier, the developing device comprising bearings at both ends of the agitation bar. A developing device for an electrophotographic copying machine, characterized in that a member is provided nearby for preventing developer from entering in a bearing direction of the agitation bar. (2) In the utility model registration claim (1), the electronic device is characterized in that the member is a rectangular flat piece extending in the length direction of the agitation bar. A developing device for a photocopy machine. (3) An electrophotographic copying machine as set forth in claim (1) of the utility model registration, characterized in that the member is a disc-shaped member arranged concentrically on the agitation bar. developing device.