JPH0631616A - Super-finish machining method for drum - Google Patents

Abstract

PURPOSE:To provide the machining method generating no sag on the edge section of a drum. CONSTITUTION:Cylindrical metal dummies 14 having the same diameter as that of a drum 3 are arranged at both ends of the cylindrical lengthy drum 3 for a printer, and elastic bodies such as rubbers 15 are arranged on their outsides. One end of the drum 3 is chucked 17 to the main spindle side, the other end is held by a rotary center 16, the drum 3 and the cylindrical metal dummies 14 are concurrently rotated, and a film 12 is pressed to the drum 3 by a rubber roller 11 for polishing. Fluctuations of tens Hz on both sides in the axial direction are applied to the rubber roller 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superfinishing method for a drum in an ion printer for OA equipment.

[0002]

2. Description of the Related Art Ion printers for OA equipment are conventionally known laser printers, LED printers, LC printers.
Unlike a D printer or the like, there is an advantage that the structure is simple because it does not require an optical system, and FIG. 3 shows a schematic structure of this kind of ion printer.

Based on the print symbol, the ion cartridge 1
Ions 2 generated from the above are radiated toward the drum 3, and an electric charge corresponding to a print signal is placed on the drum 3 to form an electrostatic latent image. One-component magnetic toner 4 to magnet roller 5
And the electrostatic latent image on the drum 3 is visualized by the toner 4. Transfer and fixing are performed at the same time by applying pressure from the back side of the fed paper 6 with the pressure roller 7. The residual toner on the drum 3 is removed by the cleaning blade 8, and the residual charge on the drum 3 is erased by the eraser 9 for the next image formation.

In the ion printer having such a structure, the gap dimension P between the drum 3 and the magnet roller 5 when the electrostatic latent image on the drum 3 is visualized is increased as one of the major factors for determining the image quality. If the change (deflection) of the dimension P is large, problems such as distortion of characters and symbols and shading of printing will occur. Therefore, high precision is required for processing both the drum 3 and the magnet roller 5.

Particularly, the drum 3 is capable of retaining electric charge, has high surface hardness and good wear resistance to realize a long life, and has good releasability of the one-component magnetic toner.
Is required. Therefore, the thickness of the drum surface is 30
Insulation coating of about 40 μm is applied. This state is shown in Figure 4.
Shown in. The coating film 10 was made of a resin containing fine particles such as alumina oxide, and was spray-coated on the drum 3.
The surface roughness of the coating film 10 has a maximum surface roughness of 3 to 4 μm, and the surface has a skin called orange peel.

This has the following problems. Since the surface roughness is rough, the amount of the toner 4 which is a fine particle of 1 to 2 μm on the surface is not constant, and there is a problem that the transferred density becomes uneven. The coating film 10 contains fine particles such as alumina oxide in order to have abrasion resistance.
The phenomenon in which the coating film 10 does not uniformly disperse in 0 and settles to the lower side of the coating film 10, resulting in 5-10 μm above the coating film 10
Insufficient fine particles in the layer. The portion lacking the fine particles has drawbacks such as low hardness and low wear resistance. Therefore, there was a big problem in the durability of the drum. Therefore, the coated drum is polished by a well-known film type super finishing device to remove 5 to 10 μm in a portion having insufficient hardness and improve the maximum surface roughness to 1 μm or less.

[0007]

However, the above-mentioned prior art has the following drawbacks. That is,
As shown in FIG. 5, the processing principle of the well-known film type super finishing device is a rubber roller 11 and a drum 3 having appropriate hardness.
6, the rubber roller 11 is vibrated in the longitudinal axis direction (A ← → B direction) of the drum 3 through the polishing film 12 and pressed against the rotating drum 3 about 0.5 mm. This is a device for finishing the surface of the drum 3 by the obtained pressure.

Since the film 12 is sequentially fed, there is no possibility that the film 12 is clogged and cannot be processed.
Conventionally, the drum 3 was processed by this method, but as shown in FIG. 7 which is an enlarged view of the C portion of FIG.
When the rubber roller 11 comes to both ends of the drum 3, an elastic force acts to restore the deformed portion of the rubber roller 11 from the drum 3 to the original position. Due to this deformation of the rubber roller 11, a sag 13 was generated at the edge of the coated portion at the end of the drum 3. Due to the occurrence of the sag 13, the following serious problems occurred for the printer.

That is, the drum 6 of FIG.
(See FIG. 3) After the transfer, the residual toner is completely scraped off by the blade 8.
If the edge of the blade is sagging 13, the blade 8 does not contact the entire surface of the drum 3, so that the toner 4 attached to the portion where the sagging 13 does not rotate is rotated with the drum 3 without being removed by the blade 8. . As a result, there is a serious problem that the residual toner spreads to the other parts of the drum 3 and then is transferred to the paper 6 to stain the paper 6. In this way, the sag 13 on the edge of the drum 3
There has been a long-felt need to eliminate this.

The present invention aims to solve the above-mentioned drawbacks of the prior art, and provides a processing method in which the sag 13 does not occur on the edge portion of the drum 3, and as a result, the transferred paper 6 is of high image quality without stains. Aim to get a printer.

[0011]

The present invention uses the following means in order to solve the above problems. To explain with reference to FIG. 1, a cylindrical dummy 14 having the same diameter as the drum diameter is provided at both ends of a cylindrical elongated drum 3 which is an object to be processed.
While the drum 3 is closely attached to the drum 3, while simultaneously rotating the drum 3 and the cylindrical dummy 14, the rubber roller 11 of the superfinishing device is swung to both sides in the longitudinal axis direction (A ← → B direction), and the film 12 is removed. While feeding little by little, the rubber roller 1 is also attached to the cylindrical dummy 14 at the drum 3 and its end.
1 is pressed to feed the rubber roller 11 in the longitudinal direction of the drum 3 to process the drum 3.

[0012]

[Embodiment 1] FIG. 1 shows a processing method of this embodiment. A metal cylindrical dummy 14 having the same diameter as the drum diameter is arranged at both ends of a drum 3 having a long cylindrical shape, and a rubber 1 is further provided on the outside thereof.
An elastic body such as 5 is arranged to bring the metal cylindrical dummy 14 into close contact with the drum 3. In this state, one end of the drum 3 is chucked to the main shaft side, the other end is held by the rotation center 16, the drum 3 and the metal cylindrical dummy 14 are simultaneously rotated, and the film 12 is pressed onto the drum 3 by the rubber roller 11. And polish.

The hardness of the rubber roller 11 is generally 30.
Approximately 70 degrees is often used, and the rubber roller 11 is oscillated in both directions (A ← → B direction) in the longitudinal axis direction in the drawing at a magnitude of several tens of hertz. According to this method, even if the rubber roller 11 comes to the positions of both ends of the drum 3 shown in the drawing, even if the rubber roller 11 protrudes from the end of the drum 3, the metal cylindrical dummy 14 receives the rubber roller 11 so that the rubber roller 11 is not deformed. Therefore, the edge of the drum 3 does not sag 13. Since the edge sag 13 does not occur, the toner 4 does not remain when the toner 4 is scraped off by the blade 8 shown in FIG. Since the drum 3 is printed in a clean state even after long-term use, it has a great effect on maintaining a good image quality.

[0014]

Second Embodiment FIG. 2 shows a resin film cylindrical dummy 18 used in this embodiment. The difference from the cylindrical dummy 14 of the first embodiment described above is that the same coating film 10 as the coating agent of the drum 3 is provided on the outer peripheral surface of the metal cylinder 19. When this resin film cylindrical dummy 18 is used, the first embodiment
In addition to the above effect, since the surface of the drum 3 is coated with the coating agent, it is polished to the same level as the surface of the drum 3 in the super-finishing polishing process. Therefore, as the polishing progresses, the diameters of the drum 3 and the resin film cylindrical dummy 18 are different, and there is no problem that the step becomes large, and the pressing load of the rubber roller 14 becomes more uniform, and the possibility of the occurrence of the sagging 13 occurs. Will also be smaller. As a result, there is a great effect of eliminating the residual toner 4, and the image quality can be further improved.

[0015]

As described above, according to the processing method of the present invention, there is provided a processing method in which the surface roughness of the drum surface is improved and the sag of the edge of the drum does not occur when the surface layer of several μm is removed. As a result, when the toner on the drum is scraped off by the blade, the toner does not remain and the drum is not contaminated. This means that the paper printed by the printer is free from stains and has the effect of greatly improving the image quality.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a processing method according to a first embodiment of the present invention.

FIG. 2 is a front view of a resin film cylindrical dummy according to a second embodiment of the present invention.

FIG. 3 is a conceptual diagram of an ion printer.

FIG. 4 is a sectional view of a drum of an ion printer.

FIG. 5 is a conceptual diagram of a film type super finishing device.

FIG. 6 is a processing step diagram in a conventional film type super finishing apparatus.

7 is an enlarged cross-sectional view of a C part in FIG.

[Explanation of symbols]

 3 drum 11 rubber roller 12 film 14 cylindrical dummy 15 rubber 16 rotation center 17 spindle chuck

Claims (2)

[Claims] 1. In a processing method of polishing a drum surface of a developing device for visualizing an electrostatic latent image with a film type super finishing device, a metal cylindrical dummy having the same diameter as the drum diameter is closely attached to both ends of the drum. A super-finishing method for drums, which is characterized by processing while rotating the drum end and the metal cylindrical dummy at the same time. 2. The method for superfinishing a drum according to claim 1, wherein a dummy whose outer peripheral surface is coated with the same coating agent as that of the workpiece is used.