JPS60136771A - Developer stirring device - Google Patents

Abstract

PURPOSE:To reduce the developer stirring device in size by forming the 1st blade member along a rotating shaft in its rotating direction, and the 2nd blade member along the rotating shaft in the opposite direction both spirally. CONSTITUTION:The 1st contact type coil spring 7 is wound spirally around along the rotating shaft 6. Then, the 2nd contact type coil spring 8 is wound along the rotating shaft 6 spirally in the opposite direction to that of the said coil spring 7. Consequently, screw-shaped blade members are formed of the 1st and the 2nd coil springs 7 and 8 on the rotating shaft 6 respectively, and the developer stirring device is therefore reduced in size.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a developer stirring device used in an electrostatic recording device such as a copying machine, and more particularly to a stirring device using a two-component developer.

Conventional Structure and Problems There has been rapid progress in miniaturization of electrostatic recording devices such as copying machines in recent years. When downsizing as described above, paper feed.

Is there a need to downsize developing, fixing, and other devices?

Among these, when downsizing the developing device, parts other than the hopper must be downsized because the hopper capacity can be filled with as much developer as possible to extend the time for replenishing the developer.

In addition, in copying machines that use two-component developers, consisting of iron powder called a carrier and toner, which is a coloring pigment, the toner, which is a consumable material, is added to the developer at regular intervals or constantly. Is it necessary to replenish it? Since it is necessary to sufficiently stir the replenishment toner and conventional developer, charge the replenishment toner to a certain amount, and maintain the toner concentration of the developer at a constant level, various large stirring devices are installed inside the developing device. It was set up. How to downsize this developer stirring device has been a problem when downsizing the developing device.

Hereinafter, a conventional developer stirring device will be described with reference to the drawings. FIG. 1 is a top view of essential parts of a conventional developer stirring device. In Figure 1, 1a and 1b 5US3
A rotating shaft made of 04 material, fixed to the two-piece rotating shaft 1a,
A screw 3 made of acrylic butadiene styrene resin conveys and stirs the developer to the left in FIG. 1, adjacent to screw 2VC, and the screw pitch is set twice that of screw 2. This is a screw molded from acrylic butadiene styrene resin that transports and stirs the developer to the right above. 4a and 4b are gears that mesh with each other, and are fixed to the rotating shafts 1a and 1b, respectively. A driving force from a drive source (not shown) is transmitted to the gear 4b, and the rotating shafts 1a and 1b are rotated in opposite directions. It will be done.

6 is a non-magnetic cylindrical sleeve, and solid arrows indicate the flow of developer. In addition, the person is the toner supply section.

The operation of the conventional developer stirring device constructed as described above will be described below. Toner supplied by a person in the supply section is transferred by a screw 2 toward an end opposite to the toner supply section. During this time, the replenishment toner is sufficiently stirred with the developer by the rotation of the screw 2, and is conveyed without clumping. Next, when the developer carried by the screw 2 reaches a certain amount at the end, it is transferred to the adjacent screw 3 and transported in the direction of the toner supply section A. During this time, developer is supplied to the sleeve 6. Further, the pitch of the screw 3 is twice the pitch of the screw 2 to speed up the feeding of the developer. This is because there are 3 screws, and rather than stirring the purpose, it is better to have the function of supplying the agitated developer to the sleeve 5K<4' and the function of quickly returning unnecessary developer to the toner replenishment department. It is.

However, with the above configuration, two rotating shafts are required for stirring and transporting the developer, which increases the size of the developing device, and when replenishing toner when there is a shortage of toner, it is necessary to directly supply the developer to the sleeve. The problem is that it takes a relatively long time for the toner to uniformly reach the feeding screw.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems, and provides a small-sized developer stirring device that can efficiently stir developer and quickly supply it onto a sleeve.

Structure of the Invention In order to achieve the above object, the developer stirring device of the present invention has the following features:
A first stirring means having a first blade member, a second stirring means having a second blade member, and a shaft rotating in one direction, the first blade member being connected to the rotating shaft. The second blade member is spirally formed in the rotational direction of the rotational shaft along the rotational axis VC, and the second blade member is spirally formed in the opposite rotational direction of the rotational axis along the rotational axis VC, and the first blade member and the The blade member is integrated at several points of intersection with the second blade member, and is configured to be rotatable within the developing device.

With this configuration, the developer stirring device can be downsized, the developer can be efficiently stirred, and the developer can be quickly supplied onto the sleeve.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a top view of essential parts of a developer stirring device according to an embodiment of the present invention.

In FIG. 2, numeral 4 is a gear, 5 is a sleeve, solid arrows indicate the flow of developer, and numeral is a toner replenishment section, which is the same as the conventional example shown in FIG. 6ke5US30
4 is a rotating shaft made of material, 7 is a close-contact type first coil spring made of 5US304 with a wire diameter of 0.6M and a coil diameter of 5 mm, and is wound spirally around the rotating shaft 6. be. 8
is a close-contact type second coil spring similar to the first coil spring 7, and is connected to the first coil spring 7 along the rotation axis 6.
``It is spirally wound in the opposite direction.

With this configuration, a screw-shaped blade member is formed on the rotating shaft 6 by the first coil spring 7 and the second coil spring 8. A total of four locations on both ends of the first coil bye 7 and the second coil spring 8 are fixed to the rotating shaft 6 by screws 9.

Moreover, the coil springs are meshed at each intersection point of the coil springs 7 and 8.

The operation of the developer stirring device of this embodiment configured as described above will be described below. The toner supplied by the toner replenishing section is agitated from side to side by coil springs 7 and 8, and is spread relatively evenly from side to side in a short period of time. However, coil springs are wound only in a certain direction at both ends of the rotating shaft 6 to prevent the developer from leaking outside. The developer thus stirred while the rotating shaft 6 rotates several times is supplied to the sleeve 6 from between the rotating shaft 6 and the sleeve 5.

According to this embodiment, as shown in FIG. It is small in size, can efficiently stir the developer, and can quickly supply the developer onto the sleeve.

Effects of the Invention As shown in L, the developer stirring device of the present invention rotates the first blade member in the rotational direction along the rotational axis, and the second blade member in the opposite rotational direction along the rotational axis. By forming each of the sleeves in a spiral shape, the developer stirring device can be made smaller, and it is possible to efficiently stir the developer and quickly supply the developer to the sleeve. be.

[Brief explanation of the drawing]

FIG. 1 is a top view of main parts of a conventional developer stirring device, and FIG. 2 is a top view of main parts of a developer stirring device according to an embodiment of the present invention. 5... Sleeve, 6... Rotating shaft, 7.
...First coil spring, 8...Second coil spring.

Claims (1)

[Claims] A first stirring means having a first blade member, a second stirring means having a second blade member, and a shaft rotating in one direction, the first blade member being connected to the rotating shaft. The second blade member is formed spirally in the rotational direction of the rotational shaft along the rotational axis, and the second blade member is formed spirally in the opposite rotational direction of the rotational axis around the rotational shaft, and A developer stirring device characterized in that the blade member is integral with the second blade member at several intersections and is configured to be rotatable within the developing device.