JP2702008B2 - Method of manufacturing developing sleeve for copy machine etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a developing sleeve for use in a copying machine or a computer printer.

[0002]

2. Description of the Related Art Recently, in a copying machine or a printer of a computer, there is a tendency that a developing sleeve for supplying toner in a toner reservoir to a photosensitive drum and a toner reservoir are unitized and disposable in order to facilitate handling by a user. There is. Such units need to be as inexpensive as possible. Unexamined Japanese Patent Application No.
In the developing sleeve described in JP-A-2700082, a lid member serving as a journal portion is press-fitted into an open end of a pipe material of aluminum, an aluminum alloy, or a nonmagnetic metal,
It was made by caulking the end of the pipe blank against the lid member.

[0003]

Problems to be Solved by the Invention
In the configuration described in Japanese Patent Application Publication No. 0082, the lid member serving as the journal portion is manufactured separately from the pipe material, and the end of the pipe material is cut to match the outer diameter of the lid member. Since the lid member is press-fitted, a considerable manufacturing cost is required.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the manufacturing cost by manufacturing a developing sleeve by merely performing pressure drawing or pressure bending and finish cutting on a pipe material of aluminum or an aluminum alloy or a non-magnetic metal. It is.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a conical hole of a first mold and that of a tubular material.
Insert the conical hole in the tubular shape with the respective axes aligned.
By applying a pushing force by fitting it to the end of the material
Making said end substantially frustoconical; and
Align the axis of the cylindrical hole of the mold 2 with the axis of the tubular material
The cylindrical hole is inserted into the truncated cone of
It is possible to apply a pushing force by fitting to the shaped end.
And the frusto-conical end is substantially circular.
Making the tube into a cylindrical shape, and the tube being made into the cylindrical shape
Provided is a method for manufacturing a developing sleeve of a copying machine or the like, comprising a step of bending an end of a sheet material inward to form a double structure .

[0006]

[0007]

[Action] In the onset bright, tubular material while rotating is captured between the metal core and restraining frame is pushed the end is pressurized axially conically hole in the first die, The end of the tubular material is frusto-conical, then the end is pushed into the cylindrical bore of a second mold to form a cylinder, and the end is internally formed by a third mold . Bend toward
Built.

[0008]

[0009]

1 and 2 show a method for manufacturing a developing sleeve according to an embodiment of the present invention.

In the first step shown in FIG. 1, a pipe material 1 made of aluminum, an aluminum alloy, or a non-magnetic metal is axially added while rotating while being restrained between a stepped core 2 and a restraining frame 3. The end is pushed into the conical hole 4a of the first mold 4 by being pressed, and the end of the pipe blank 1 is formed into a truncated conical shape. The cored bar 2 includes a first cylindrical portion 2a having an outer diameter slightly smaller than the inner diameter of the pipe blank 1 and a second cylindrical portion 2b having an outer diameter smaller than the outer diameter of the first cylindrical portion. Have. In addition, core metal 2
May have a step 2c between the first cylindrical portion 2a and the second cylindrical portion 2b according to the finished shape of the developing sleeve.

In the second step shown in FIG. 2, the pipe material 1 whose end is formed into a frusto-conical shape in the first step rotates while being restrained between the cored bar 2 and the restraining frame 3. The cylindrical hole 5 of the second mold 5 is pressed in the axial direction.
The end is pushed into a to form a cylindrical shape. The cylindrical hole 5 a of the second mold 5 has an inner diameter smaller than the outer diameter of the pipe blank 1, and the second mold 5 is
It may have a step 5c corresponding to c.

[0012]

[0013]

In a third step (not shown ) , the conical tool is
By the well-known curling or reversing process used,
Double structure by bending the cylindrical end inward to the inside
And the thickness of the end portion is approximately equal to the thickness of the remaining portion of the tubular material.
Double it.

In a fourth step (not shown), the inner and outer diameters of the end of the pipe blank 1 whose end is made considerably thick in the third step are cut, and a part of the end is formed. The flattened provides a detent.

[0016]

[0017]

[0018]

As described above, the method for manufacturing the developing sleeve according to the present invention is only required to perform pressure drawing or pressure bending and cutting on a pipe material of aluminum, an aluminum alloy or a non-magnetic metal. Since the developing sleeve can be manufactured in a short time, the manufacturing cost is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first step of a method for manufacturing a developing sleeve according to one embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a second step of the method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe material 2 Core metal 3 Restraining frame 4 First die 4a Conical hole 5 Second die 5a Cylindrical hole

Claims (1)

(57) [Claims] 1. A conical hole of a first mold and that of a tubular material.
Insert the conical hole in the tubular shape with the respective axes aligned.
Step to substantially frustoconical shape end portion by which is fitted to an end portion of the material exerts a pushing force, and the
Align the axis of the cylindrical hole of the mold 2 with the axis of the tubular material
The cylindrical hole is inserted into the truncated cone of
Making said frusto-conically shaped end substantially cylindrical by fitting it into said shaped end and exerting a pushing force ; and said cylindrically shaped tubular material A method of manufacturing a developing sleeve for a copying machine or the like, comprising a step of bending an end of the sheet inward to form a double structure.