JP3023733B2 - Packing for closing developing roller exposure port and developing device with the packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used for preventing a developer from spilling from a developing device when a developing device containing a powder developer such as an electrophotographic copying machine is transported. The present invention relates to a packing for closing a roller exposure port and a developing device to which the packing is attached.

[0002]

2. Description of the Related Art Conventionally, when a developing device containing a powder developer is transported, a urethane foam sheet is applied from the outside of the developing device so as to cover the developing roller exposure opening, and an adhesive tape is applied around the exposure opening. Cover the outside of the developing unit with the Styrofoam molded article covering the outside of the developing unit so that the developer does not spill out from the developing roller exposure opening, and pack the developing unit together with the coated body into a cardboard box or the like. Has been done. In such a method of applying a sheet from the outside of the developing device to prevent the developer from spilling out from the developing roller exposure port, if a large run-out or reversal is performed during transportation, the sheet is compressed and pressed like a urethane home. Even when a sheet that is easy to use is used, a considerable amount of the developer adheres to the sheet, and there is a problem that the developer is easily spilled when the sheet is removed from the developing device, and the surroundings are easily stained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is intended to prevent the developer from spilling from a developing roller exposure opening and to remove the surroundings from the developing device. An object of the present invention is to provide a packing for closing a developing roller exposure opening, which is less likely to be soiled, and a developing device provided with the packing.

[0004]

According to the present invention, there is provided an elastic foam which is sandwiched and compressed between a developing roller surface on a developer return side after passing through a developing area and a container wall surrounding the outside of the developing roller. The elastic foam covers the developing roller side surface and extends to the developing area side.The extended portion can close the developing roller exposure port of the developing device, and can be stuck to the outer surface of the container wall on the developer sending side to the developing area. A packing for developing roller exposure opening sealing consisting of an integral bond with a film that can be attached, and a packing consisting of an elastic foam and a film integrally joined,
After the polymerized portion of the elastic foam and the film passes through the developing zone, it is sandwiched between the developing roller surface on the developer return side and the container wall surrounding the outside of the surface, and extends outward from the elastic foam. The film portion covers the developing roller exposure opening of the developing device, and the most extended end portion of the film portion is releasably adhered to the outer surface of the container wall on the side where the developer is sent to the developing area. The above-mentioned object is achieved by these configurations.

[0005]

In other words, the packing of the present invention and the developing device to which it is attached are used to clean the surface of the developing roller on the developer return side and the outside thereof after passing through the developing area where the overlapped portion of the elastic foam and the film is likely to spill out the developer. Since the gap is closed so that it is compressed between the enclosing walls, the developer only adheres to the front end surface or the front side end surface of the polymerized portion, and the elastic foam of the film comes off and the development is performed. The portion extending to the area side covers the developing roller exposure port and the leading end is provided with a doctor blade, a developer leveling member, or a doctor roller having a combination of these functions, so that the developer does not easily spill out. Since the adhesive is adhered to the outer surface of the container wall surrounding the outer surface of the developing roller on the side where the developer is fed, almost no adhesion of the developer to the film portion occurs.
It is possible to prevent the developer from spilling from the developing roller exposure opening, and to easily prevent the developer from dropping around when removing the packing from the developing device.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1 and 2 are a schematic sectional view and a perspective view showing an example of a developing device with packing according to the present invention, and FIG. 3 is a perspective view showing an example of packing according to the present invention.

In the drawing, 1 is a developing device, 2 is a main body made of a resin molded product or the like, and 3 is an upper wall member made of a resin molded product or the like attached to the main body 2 by a method such as an adhesive, heat welding, or screwing. Numeral 4 is a developing roller made of a non-magnetic material such as aluminum which has a fixed magnet body 5 inside and is rotated in the direction of the arrow during development. The developing roller 4 extends from the exposed opening 2a formed in the main body 2 to the surface. To the outside.

The developing device 1 shown in FIG.
A rotatable spacer roller 6 is provided on both sides of the developing device 1, and the mounting position of the developing unit 1 is determined by bringing the spacer roller 6 into contact with an image forming drum surface of a recording device (not shown).

Reference numerals 7 and 8 in FIG. 1 denote agitating rollers which are rotated in the directions of the arrows to agitate the developer in the developer reservoir 2b of the main body 2 to make the developer uniform and to charge the same. The stirring roller 7 further works to move the developer from the back side to the front side in FIG. 1, and the stirring roller 8 works to move the developer in the opposite direction. Supply.

Reference numeral 2c denotes a toner receiving passage formed in the main body 2, into which toner is fed from a toner hopper provided in a recording device (not shown) by a coil conveyor or the like.
The fed toner is dropped onto the stirring rollers 7 and 8 from the lower opening 2d and the tip opening 2e, respectively.

Reference numeral 9 denotes a doctor blade for regulating the layer thickness of the developer which is conveyed while being adhered to the surface by the developing roller 4 rotating in the direction of the arrow, 10 is a developer leveling member made of an elastic material such as rubber, and 11 is a developer. The scraper blade is a scraper blade that separates the developer that has passed through the developing area where the roller 4 is exposed and returned into the developing device 1 from the developing roller 4 and reduces the developer to the developer pool 2b. In addition, a doctor roller is used instead of the doctor blade 9 and the leveling member 10.

The packing 20 shown in detail in FIG. 3 is attached to the developing device 1 in the illustrated example in which the developer is charged into the developer reservoir 2b. The packing 20 is a part of the upper and lower container walls of the developing device 1 that partition the upper and lower portions of the developing area, that is, the container wall on the receiving side of the return developer, that is, the developing roller 4 of the upper wall member 3.
An elastic foam 21 made of a material such as a urethane home sheet interposed between the side portion and the surface of the developing roller 4
The surface of the elastic foam 21 on the side of the upper wall member 3 is almost exposed, and the surface of the developing roller 4 is entirely covered. It is constituted by a resin film 22 such as a polyester film adhered to both sides of the elastic foam 21 so that a portion extending with a width substantially equal to the opening 2a forms a loop.

The reason why the packing 20 covers the surface of the elastic foam 21 on the side of the developing roller 4 with the film 22 is as follows.
The main reason is that the elastic foam 21 and the film 22 can be adhered to each other on the surface thereof so that the elastic foam 21 and the film 22 can be adhered to each other. The packing 20 in the illustrated example is the upper wall member 3 of the elastic foam 21.
The reason why the side surface is almost exposed is that the developing unit 1 in the illustrated example adjusts the flow of the airflow accompanying the rotation of the developing roller 4 so that the developer is not blown out. 3 is provided with a hole 3a for adjusting the air flow in a portion near the exposure opening 2a, so that the elastic foam 21 not covered with the film 22 is relatively easy to enter into the hole 3a, and the hole 3a is formed.
This is because the developer can be sufficiently prevented from spilling. Therefore, when the developing device 1 is not provided with such a hole 3a, both sides of the elastic foam 21
It may be covered with. It is noted that a fiber sheet having good air permeability is attached to the outside of the hole 3a to prevent the developer from spilling out of the hole 3a during use of the developing device 1 or the like.

The attachment of the packing 20 to the developing device 1 as described above is performed, for example, on the manufacturer side of the developing device by attaching the elastic foam 21 and the film 22 of the packing 20 to the upper wall member 3 before attaching the upper wall member 3 to the main body 2. The superposed portion is placed on the surface to be surrounded by the upper wall member 3 of the developing roller 4 and a film is formed.
A portion extending from the elastic foam 21 of the film 22 is hung to the outside of the exposure opening 2a, and in this state, the upper wall member 3 is covered from above and attached to the main body 2, and the film protruding outside the exposure opening 2a The periphery of 22 is exposed to the outside opening 2a
It is easily done by sticking it around with adhesive tape. However, the present invention is not limited to this. After the upper wall member 3 is attached, the packing 20 is inserted between the elastic foam 21 and the film 22 by inserting a thin metal plate between the elastic foam 21 and the film 22. It is also possible to adopt a method in which the metal plate is fed into the gap between the upper wall member 3 and the developing roller 4 and the metal plate is removed when the feeding is completed. Reference numeral 12 in FIGS. 1 and 2 denotes an adhesive tape.

The removal of the packing 20 from the developing device 1 is as follows.
This can be easily achieved by removing the adhesive tape 12, pulling the film 22 coming out of the exposure opening 2a, and pulling out the elastic foam 21.

The present invention is not limited to the examples described above,
22 may be bonded to the elastic foam 21 without forming a loop, may be adhered to the main body 2 without using an adhesive tape, may be replaced when the developing device 1 runs out of toner,
A one-component developer that does not have a stirring means or the like may be used.

[0018]

By using the packing of the present invention, it is possible to prevent both the developer from spilling from the developing roller exposure port when the developing device is transported and the developer from spilling when removing the packing. The effect that packing can be easily attached and detached is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a developing device with packing according to the present invention.

FIG. 2 is a perspective view of the developing device of FIG.

FIG. 3 is a perspective view showing an example of packing according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Developing device 2 Main body 2a Exposed opening 3 Top wall member 4 Developing roller 9 Doctor blade 10 Developer leveling member 11 Scraper blade 12 Adhesive tape 20 Packing 21 Elastic foam 22 Film

Claims (3)

(57) [Claims] An elastic foam compressed between a developing roller surface on a developer return side after passing through a developing area and a container wall surrounding the outer surface of the developing roller, and an elastic foam on the developing roller side of the elastic foam. A film that covers the surface and extends to the developing area side, and the extended portion can close the developing roller exposure port of the developing device, and can be adhered to the outer surface of the container wall on the side where the developer is delivered to the developing area. Packing for closing the developing roller exposure port, which is formed by integral bonding of 2. The film is joined to the elastic foam so as to form a loop at a portion extending from the elastic foam to the developing zone side without substantially covering the surface of the elastic foam on the container wall side. 2. A packing for closing a developing roller exposure port according to claim 1. 3. A packing formed by integrally joining an elastic foam and a film, wherein the surface of the developing roller on the developer return side after passing the overlapped portion of the elastic foam and the film through the developing zone and the outside of the surface. The film portion, which is sandwiched between the container walls surrounding the developing device and extends outside the elastic foam, covers the developing roller exposure port of the developing device, and the most extended end of the film portion is moved to the developing area. A developing device with a packing attached to the developing device by being releasably adhered to the outer surface of the container wall on the developer delivery side.