JP2000127006A - Manufacture of cylinder member, and developing device and image forming device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a cylinder member wherein high quality surface and machining accuracy can be acquired without occurrence of flaws on the cylinder member surface even in continuous production, and a developing device or an image forming device equipped with the cylinder member. SOLUTION: In a manufacturing method for a cylinder member wherein a cylindrical body 1 including a flange part 2a as a shaft part on one end is processed into a cylinder member by a centerless grinding device equipped with a stepped grinding wheel, high quality surface and machining accuracy can be achieved by grinding the surfaces of the cylindrical body 1 and the flange part 2a with a grinding wheel, after cutting the surface of the flange part 2a with a cutting device while supporting the cylindrical body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cylindrical member serving as a base such as a latent image carrier and a developer carrier provided in an image forming apparatus such as an electrophotographic copying machine, a printer, a facsimile, and a printing machine. And a developing device and an image forming apparatus provided with the cylindrical member.

[0002]

2. Description of the Related Art Hitherto, latent image carriers and developer carriers provided in image forming apparatuses such as electrophotographic copying machines, laser beam printers, facsimile machines, and printing machines have a high surface as a base. A cylindrical member finished to a predetermined surface roughness with accuracy (roundness, straightness and surface accuracy) is used.

A photosensitive drum serving as a latent image carrier for an electrophotographic system is manufactured by applying a photosensitive film to the surface of a cylindrical member finished as described above. If the roundness or straightness is not sufficient, irregularities are generated in the photosensitive film, and as a result, various defects occur in the image of the image forming apparatus. Therefore, in order to obtain an image forming apparatus with high accuracy, it is necessary to first process the surface of the cylindrical member into a cylindrical surface without undulations, and the surface roughness, straightness and roundness are also extremely high. is necessary.

A latent image formed on a latent image carrier by an electrophotographic system or an electrostatic recording system is visualized by applying the developer to the surface of the latent image carrier while carrying the developer. Therefore, one-component developer, two-component developer, magnetic developer, non-magnetic developer, and even developer carrier that carries and transports these developers regardless of insulating developer or dielectric developer The body also requires extremely high precision in surface roughness, straightness and roundness.

In such a developer carrier, in order to provide the function of the cylindrical member thus formed, the cylindrical surface is roughened by sand-plasting to enhance the transportability of the developer, and to improve the charge imparting property. For the purpose of improving the quality, a method of forming a coating film in which a conductive substance such as carbon graphite or a solid lubricant is dispersed in a resin is performed.

[0006] Generally, the material of the cylindrical member has a purity of 9%.
Cu-Al alloy containing 9.5% or more Al or 0.05 to 0.20% Cu, or 0.05 to 0.20% Cu and 1.0 to 1.5% Mn Cu-Mn-Al alloy or 0.20-0.60% Si and 0.45-
An Si-Mg-Al alloy containing 0.90% Mg is used, and these materials are extruded and drawn to have a certain degree of shape accuracy.

[0007] However, since such an aluminum drawing cylinder remains largely bent when it is used as it is, it is usually necessary to perform a roll correction or the like to finish it to a desired shape accuracy. After that, it is cut to a predetermined length, the ends are finished by cutting for the purpose of removing burrs at both ends, and improving the end face accuracy. Further, if necessary, the outer peripheral surface of the cylindrical member is subjected to cutting or grinding. To obtain a desired dimensional accuracy. In particular, for a photosensitive drum, a developer carrier, and the like, the surface properties and dimensional accuracy are important points that affect the quality of an image, and therefore, a very high-precision processing method is used.

[0008] As the most common method of this cutting,
There is precision cutting by lathe. As a specific processing method, both ends of the workpiece are held on a lathe, and cutting is performed with a cutting tool of sintered diamond or natural single crystal diamond.
By using such a special cutting tool, the processed surface is very smooth, and a processed surface like a mirror surface can be obtained.

Another method is centerless grinding (centerless grinding) using a centerless grinding machine. In this centerless grinding, generally, as shown in FIG. 8, a workpiece, which is a substantially cylindrical or cylindrical tubular member, is brought into contact with the slope of the blade and is rotated in the direction of arrow A. The grinding wheel, which is supported in contact with the adjusting grindstone and rotates at a high speed in the direction of arrow B, cuts into the surface of the workpiece to grind the workpiece.

The workpiece is stably held at a position in contact with the adjusting grindstone and the slope of the blade, and is rotated in the direction of arrow C by the rotation of the adjusting grindstone.

As described above, the workpiece rotating in the direction of arrow C is advanced in the direction of arrow E with respect to the grinding wheel rotating in the direction of arrow B at a peripheral speed slightly larger than the peripheral speed. To make a cut, but the grinding wheel, adjustment wheel,
The blades are finished and attached with high precision in advance in terms of straightness and parallelism with respect to the axial direction of the rotating shaft, so that the outer peripheral surface of the workpiece has high roundness and straightness. It is ground to high precision and ground to an accurate cylindrical surface.

These are properly used depending on the accuracy required for the cylindrical member, processing cost, and the like.

[0013]

However, such a method for processing a cylindrical member has several drawbacks as described below. For example, precision cutting with a lathe is an effective means to obtain high surface precision, but processing tools such as single crystal diamond tools or sintered diamond tools are very expensive, and hold both ends of the workpiece. After cutting, the work becomes thinner and longer, the rigidity of the work itself decreases as the work becomes longer, and there is a disadvantage that the work is bent due to the cutting resistance of the cutting tool, and the processing accuracy may be impaired. .

On the other hand, as another method for compensating for such a disadvantage with respect to the processing accuracy, there is the above-mentioned centerless grinding processing. This centerless grinding, like cutting with a lathe,
The workpiece itself is ground while being firmly supported by the three points of the grinding wheel, adjustment wheel, and blade without the need for a center ring by the spindle, enabling extremely high processing even on elongated workpieces. is there.

The blade in this centerless grinding machine is as follows:
In general, the workpiece is formed of an elongated plate having an inclined surface in contact with the sliding surface of the workpiece, and the workpiece is ground while sliding and rotating on the blade surface. The role of this blade in the centerless grinding machine is extremely important, supporting the workpiece and regulating its position,
Extremely high processing accuracy of this centerless grinding device is ensured.

In the centerless grinding, the position of the workpiece is regulated by three elements: a grinding wheel, an adjusting wheel, and a blade.
Since there is theoretically only one tangent circle formed by these three members, grinding the workpiece while being supported by these three elements requires extremely high roundness in machining accuracy. Important and effective.

If the positions and shapes of these three elements change during the grinding process, these will cause fluctuations in the processing accuracy. Therefore, these three elements have high rigidity and high rigidity as materials having stable shapes and dimensions. Metal materials such as cemented carbide having wear resistance are mainly used.

However, in such a blade,
When a cylindrical member made of a soft metal material such as aluminum or brass is ground, fine scratches called scratches may be generated on the processed surface. Although there are several reasons why this scratch occurs, generally the following two are known as the main causes.

The first cause of the occurrence of scratches is that fine abrasive grains or cuttings falling off during grinding damage the surface of the workpiece by rubbing between the blade and the workpiece. 9). This is a flaw formed by individual fine chips, and is relatively small in flaw size.

The second cause of scratch generation is that, during grinding, fine abrasive grains and chips that have fallen off generate heat and melt due to friction between the blade and the workpiece, and chips are generated on the blade surface. This is due to fusing, and the surface of the workpiece is damaged by the fused material. Here, once the chips are fused to the blade surface, scratches are continuously generated thereafter, which is a serious problem in continuous mass production processing. Further, the size of the scratch generated by the fused material is proportional to the size of the fused material. Therefore, if the fused material increases in the course of processing, the size and the number of the scratches increase and the surface roughness of the workpiece is increased. Is significantly impaired.

The mechanism by which fusion occurs on the blade surface will be described with reference to FIG. 10. First, when a workpiece is ground by a grinding wheel, chips are generated. This swarf, along with the grinding fluid flowing from above,
After falling along the blade surface, it stays between the rotating workpiece and the blade, and is rubbed against the surface of the workpiece during this time, and is instantaneously fused by the rubbing heat generated at that time. To fuse to the blade surface. At first, the small fusion material becomes a nucleus due to the rubbing process, and then gradually grows by the chips continuously falling.

Eventually, they act as if they were cutting edges, damaging the surface of the workpiece.
In particular, a soft and low-melting metal material such as aluminum or brass is liable to be easily fused because the fine chips are easily softened and melted by rubbing heat with the blade.

For this reason, it has been conventionally difficult to use this centerless grinding process on a cylindrical member such as a latent image carrier or a developer carrier that requires extremely high surface accuracy.

Conventionally, in order to prevent the occurrence of such scratches, for example, a material having good lubricity such as Teflon (registered trademark) tape is adhered to the surface of the blade to rub the surface of the workpiece with the blade. Has been reduced. However, when a few hundred pieces are ground, a lubricating material such as a Teflon (registered trademark) tape is worn out, and it has been necessary to perform complicated replacement.

Therefore, the present invention provides a method of manufacturing a cylindrical member capable of obtaining high-quality surface precision and high processing accuracy without causing any damage on the surface of the cylindrical member even in continuous production. An object is to provide a developing device or an image forming device.

[0026]

According to the present application, an object of the present invention is to provide a method of manufacturing a cylindrical member by processing a cylindrical member by a centerless grinding device into a cylindrical member. In a method of manufacturing a cylindrical member for rotating and grinding the grinding wheel while abutting the surface of a cylindrical member having a shaft portion on one end with a rotatable stepped grinding wheel, the shaft portion is supported while supporting the main body portion. This is achieved by the first invention in which after the surface is cut by a cutting device, the surface of the main body and the surface of the shaft are ground with a grinding wheel.

According to the present application, the above object is also achieved by the second invention in which the grinding allowance of the main body portion is set to be larger than the grinding allowance of the shaft portion in the first invention. Achieved.

Further, according to the present application, the above object is achieved in the first invention or the second invention, wherein the cylindrical member is rotated with reference to peripheral surfaces of both ends of the cylindrical member main body before grinding. This is also achieved by the third invention in which the amount of deflection of the shaft portion at the time of occurrence is 20 μm or less.

Further, according to the present application, the object is to provide a method of manufacturing a cylindrical member by processing a cylindrical member with a centerless grinding device to form a cylindrical member, wherein a shaft portion is provided at one end of the cylindrical main body. A cylindrical member that rotates and grinds the grinding wheel while abutting the surface of a cylindrical member having a rotatable stepped grinding wheel, and also grinds or cuts the inner surface of the main body with an inner grinding wheel or an inner cutting blade. In the manufacturing method, after cutting the surface of the shaft portion with a cutting device while supporting the body portion, while grinding the surface of the body portion and the surface of the shaft portion with a grinding wheel, the inner surface of the body portion The present invention is also achieved by a fourth invention in which grinding or cutting is performed with an inner grinding wheel or an inner cutting tool.

Further, according to the present application, the above object is achieved according to the fourth invention in that, in the fourth invention, the cylindrical member has a grinding allowance for the main body portion set to be larger than a grinding allowance for the shaft portion. Achieved.

Further, according to the present application, the above object is achieved according to the fourth or fifth aspect, wherein the cylindrical member is rotated with reference to the peripheral surfaces at both ends of the cylindrical member main body before grinding. Also, the present invention is achieved by the sixth invention in which the amount of deflection of the shaft portion at the time of the rotation is 20 μm or less.

Further, according to the present application, the above object is a method of manufacturing a cylindrical member by processing a cylindrical member by a centerless grinding device into a cylindrical member, wherein a shaft portion is provided at one end of the cylindrical main body. In the method of manufacturing a cylindrical member for rotating and grinding the grinding wheel while abutting the surface of the cylindrical member having a rotatable stepped grinding wheel, the surface of the shaft portion is supported by a cutting device while supporting the main body portion. After cutting, the surface of the main body and the surface of the shaft are ground with a grinding wheel,
The present invention is also achieved by a seventh invention in which the inner surface of the main body is cut by a cutting blade.

Further, according to the present application, the above object is achieved according to the seventh invention in the seventh invention, in which the cylindrical member has a grinding allowance for the main body portion set to be larger than a grinding allowance for the shaft portion. Achieved.

Further, according to the present application, the above object is achieved according to the seventh or eighth aspect, wherein the cylindrical member is rotated with reference to the peripheral surfaces at both ends of the cylindrical member main body before grinding. This is also achieved by the ninth invention in which the amount of deflection of the shaft portion at the time of the rotation is 20 μm or less.

According to the present application, the object is to provide a cylindrical member manufactured by the method for manufacturing a cylindrical member according to any one of the first to ninth aspects, wherein a resin layer is formed on the surface of the main body. This is also achieved by the fourteenth invention.

Further, according to the present application, the above object is also achieved by the eleventh invention in which, in the tenth invention, the resin layer is added with spherical particles having a particle diameter of 1 μm to 30 μm. You.

Further, according to the present application, the above object is to provide a developing device for applying a developer to a latent image formed on a latent image carrier to convert the latent image into a visible image. The invention is also attained by a twelfth invention in which the developer carrier has a developer carrying member, and the developer carrier is the cylindrical member of the tenth invention.

Further, according to the present application, the above object is achieved by the thirteenth invention in which, in the twelfth invention, the resin layer is added with spherical particles having a particle diameter of 1 μm to 30 μm. Is done.

According to the present application, an object of the present invention is to provide an image forming apparatus for recording an image formed by a series of image forming processes on a recording medium, comprising a latent image carrier for carrying a latent image. The invention is also achieved by a fourteenth invention in which the latent image carrier is a cylindrical member manufactured by the method for manufacturing a cylindrical member according to any one of the first to ninth inventions.

Further, according to the present application, an object of the present invention is to provide an image forming apparatus for recording an image formed by a series of image forming processes on a recording medium, comprising: a latent image carrier for carrying a latent image; A developing device according to a twelfth invention, wherein the latent image carrier is a cylindrical member manufactured by the method of manufacturing a cylindrical member according to any one of the first to ninth inventions. Is also achieved.

According to the present application, the above object is also attained by the sixteenth invention in which, in the fifteenth invention, the resin layer is added with spherical particles having a particle diameter of 1 μm to 30 μm. Is done.

That is, according to the first aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. Grinding with a grinding wheel reduces runout of the shaft during grinding and reduces the grinding allowance of the cylindrical member body.

According to the second invention of the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the surface of the shaft are cut. Grinding with a grinding wheel reduces runout of the shaft during grinding and reduces the grinding allowance of the cylindrical member body.

Further, in the third invention according to the present application, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. Grinding with a grinding wheel reduces runout of the shaft during grinding and reduces the grinding allowance of the cylindrical member body.

According to a fourth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. By grinding with a grinding wheel, and grinding or cutting the inner surface of the main body with an inner grinding wheel or an inner cutting tool, the deflection of the shaft during grinding is reduced, and the grinding allowance of the cylindrical member body is reduced. Let it.

Further, according to the fifth invention of the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the surface of the shaft are cut. By grinding with a grinding wheel, and grinding or cutting the inner surface of the main body with an inner grinding wheel or an inner cutting tool, the deflection of the shaft during grinding is reduced, and the grinding allowance of the cylindrical member body is reduced. Let it.

According to the sixth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. By grinding with a grinding wheel, and grinding or cutting the inner surface of the main body with an inner grinding wheel or an inner cutting tool, the deflection of the shaft during grinding is reduced, and the grinding allowance of the cylindrical member body is reduced. Let it.

Further, according to the seventh aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. Are ground with a grinding wheel, and thereafter, the inner surface of the main body is cut with a cutting blade, thereby suppressing runout of the shaft during grinding and reducing the grinding allowance of the cylindrical member main body.

According to the eighth aspect of the present invention, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the surface of the shaft are cut. Are ground with a grinding wheel, and thereafter, the inner surface of the main body is cut with a cutting blade, thereby suppressing runout of the shaft during grinding and reducing the grinding allowance of the cylindrical member main body.

Further, according to the ninth invention of the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the surface of the shaft are cut. Are ground with a grinding wheel, and thereafter, the inner surface of the main body is cut with a cutting blade, thereby suppressing runout of the shaft during grinding and reducing the grinding allowance of the cylindrical member main body.

According to the tenth aspect of the present invention, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the surface of the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel enhances the surface accuracy of the main body of the cylindrical member.

Further, in the eleventh invention according to the present application, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. A resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel and having spherical particles having a particle size of 1 μm to 30 μm added thereto enhances the surface accuracy of the cylindrical member main body.

In the twelfth invention according to the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel increases the surface accuracy of the cylindrical member main body.

Further, in the thirteenth invention according to the present application, the surface of the shaft is cut by a cutting device while supporting the main body of the cylindrical member, and then the surface of the main body and the shaft are cut. A resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel and having spherical particles having a particle size of 1 μm to 30 μm added thereto enhances the surface accuracy of the cylindrical member main body.

According to a fourteenth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel increases the surface accuracy of the cylindrical member main body.

In the fifteenth invention according to the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel increases the surface accuracy of the cylindrical member main body.

Further, in the sixteenth invention according to the present application, the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, and then the surface of the body and the shaft are cut. A resin layer formed on the surface of the main body of the cylindrical member obtained by grinding the surface with a grinding wheel and having spherical particles having a particle size of 1 μm to 30 μm added thereto enhances the surface accuracy of the cylindrical member main body.

[0058]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of an electrophotographic apparatus as an example of an image forming apparatus provided with a developer carrier and a latent image carrier having a cylindrical member as a base according to the present invention.

The photosensitive drum 51 as a latent image carrier has a shaft 51
It is designed to be driven to rotate at a predetermined peripheral speed in the direction of the arrow around a. The photosensitive drum 51 is uniformly charged with a predetermined positive or negative potential around the photosensitive drum 51 by a charging means 52 during the rotation process, and then, in an exposure section 53, a light image exposure L (slit exposure) , Laser beam scanning exposure, etc.). As a result, an electrostatic latent image corresponding to the exposure image is sequentially formed around the photosensitive drum 51.

The electrostatic latent image is then visualized as a toner image by a developing means 54 having a developing sleeve 54a as a developing carrier, and the toner image is transferred by a transfer means 55 from a paper feeding unit (not shown) to a photosensitive drum 51. The transfer material P is sequentially transferred onto the surface of the supplied transfer material P in synchronization with the rotation of the photosensitive drum 51.

The transfer material P to which the toner image has been transferred is
It is separated from the surface of the photosensitive drum 51 and is introduced into the image fixing means 58, where the image is fixed and printed out as a recipient copy outside the machine. The surface of the photosensitive drum 51 after the image transfer is cleaned and cleaned by the removal of the untransferred toner by the cleaning means 56, and is further subjected to a charge removal treatment by the pre-exposure means 57, and is repeatedly used for image formation.

As the uniform charging means 52 for the photosensitive drum 51, a roller charging or corona charging device is generally widely used. As the transfer means, roller transfer and corona transfer means are generally widely used.

As an electrophotographic apparatus, a plurality of components such as the photosensitive drum, developing means, and cleaning means described above are integrally connected as a unit, and this unit is configured to be detachable from the apparatus main body. Is also good. For example, at least one of the charging unit, the developing unit, and the cleaning unit is integrally supported together with the photoreceptor, and the unit is detachably attached to the apparatus main body as a single unit. It may be configured.

In the case where the electrophotographic apparatus is used as a copying machine or a printer, the light image exposure L is a process of reading a reflected light or a transmitted light from the original, or reading the original, converting the original into a signal, and scanning the laser beam with this signal. This is performed by driving an LED array or driving a liquid crystal shutter array.

Further, when used as a facsimile printer, the light image exposure L is an exposure for printing received data. FIG. 2 is a block diagram showing an example of this case.

The controller 61 includes an image reading unit 60
And the printer 69 are controlled. The whole controller 61 is controlled by the CPU 67.

The read data from the image reading section is transmitted to the partner station through the transmission circuit 63. The data received from the partner station is sent to the printer 6 through the receiving circuit 62.
Predetermined image data is stored in the image memory 66 sent to the memory 9. The printer controller 68 controls the printer 69. In the figure, reference numeral 64 denotes a telephone.

The image received from the line 65 (image information from the remotor terminal connected via the line) is demodulated by the receiving circuit 62, and then the CPU 67 performs a decoding process of the image information. Is stored in And
When stored in at least one page of image memory 66,
The image of the page is recorded. The CPU 67 reads out one page of image information from the image memory 66 and sends out the decoded one page of image information to the printer controller 68. When receiving the image information of one page from the CPU 67, the printer controller 68 controls the printer 69 to record the image information of the page.
As described above, image reception and recording are performed.

Conventionally, Japanese Patent Application No. 8-46187 and Japanese Patent Application No.
As proposed in Japanese Patent No. 46188/46188, such a proposal is to improve the shape of the blade. One is to have a shape having a large number of contact portions that make point contact in the axial direction of the workpiece, and Use a blade that forms a round at the apex of the contact part, and use a cylindrical body or a cylindrical body that is rotatably supported on the blade bearing part with the rotation axis oriented in the axial direction of the workpiece. It is to be.

With this technique, the occurrence of scratches can be greatly reduced. As a result of studying whether there is a way to suppress the occurrence of flaws without such a modification of the device, it is possible to suppress the occurrence of flaws by reducing the amount of chips in the cylindrical main body Was found.

The reason why the generation of scratches is suppressed by reducing the amount of such chips is not clear, but is estimated as follows. In other words, a grinding wheel is made of three elements: abrasive grains, a binder, and pores. The role of the abrasive grains is to grind the workpiece as a cutting edge, and the binder is used to hold and hold the abrasive grains. The role is that the pores have a role of chip escape and cooling.

Here, when a large amount of chips is supplied during grinding (when the grinding allowance is large), the pores are clogged because the escape of chips in the pores cannot catch up.
As a result, it is presumed that the chips that cannot be escaped fuse to the blade and cause scratches.

In such a situation, a method for stably improving the run-out accuracy of the shaft portion was examined. As a result, it was found that the shaft portion could be realized by supporting and cutting the cylindrical body after press-fitting the shaft member. . In this method, the runout accuracy of the shaft can be realized with an accuracy of 0.02 mm or less. At an accuracy of 0.02 mm or less, the grinding allowance of the cylindrical main body may be 0.09 mm. According to such a method, it is possible to greatly reduce the grinding allowance and suppress the generation of scratches.

Next, the manufacturing process of the cylindrical member according to the present embodiment will be described.

FIG. 3 shows a manufacturing process of the developing sleeve 54a as a cylindrical member according to the present embodiment.
As shown in (a), a tubular body 1 as a tubular member main body, which is reduced to a predetermined outer diameter by cutting out an aluminum pipe material and cut to a predetermined length, is prepared.

First, as shown in FIG. 3 (b), the flange portion 2 of the flange member 2 which is the shaft member serving as the shaft portion of the cylindrical member
a is press-fitted into one end 1a of the cylindrical body 1 and the two are integrally connected to each other to produce a work W including the cylindrical body 1 and the flange member 2. The bonding method may be any of known bonding and caulking other than press fitting.

Next, the cylindrical member 1 is held and the flange member 2 is held.
The outer diameter part of. In the cutting of the flange member 2, the inclination at the time of joining and the flange portion 2 of the flange member 2
In this method, it is preferable to cut about 0.3 mm in diameter, although it depends on the runout accuracy when a is the fulcrum. 0.02m as a grinding allowance for the next grinding
It is preferable to leave m. Cutting can be performed by a generally used apparatus and method.

Next, as shown in FIG. 3 (c), the work W is formed by a stepped outer surface grinding wheel Gl constituting first and second centerless grinding means as centerless grinding devices which rotate integrally with each other. A cylindrical surface (hereinafter, referred to as a cylindrical surface of the work) 1b, which is a surface of the cylindrical body 1, and a shaft portion (hereinafter, referred to as a work shaft portion) 2b of the first flange member 2 are ground.

When the amount of chips is small (when the grinding allowance is small), it is presumed that the occurrence of scratches is suppressed by appropriately escaping the pores.

In a work having a cylindrical main body and a shaft member connected to one end thereof, it is difficult to simply reduce the grinding allowance. In a high-precision cylindrical member, one of required accuracy is runout accuracy. In order to obtain a high-quality image, it is required that the deflection accuracy of the main body and the deflection accuracy of the shaft portion when rotated with reference to both ends of the cylindrical main body be as small as possible. In response to this demand, there is a method in which the cylindrical main body and the shaft portion are simultaneously ground with a stepped grindstone in a feeding centerless manufacturing method, and the desired runout accuracy can be stably obtained with high accuracy.

In such a manufacturing method, it is preferable that the cylindrical main body is cut first to hold an approximately entire surface of the main body, and then the shaft portion is cut. For example, when the run-out of the shaft before grinding is large, the shaft comes into contact with the grindstone before the cylindrical main body is ground first and the entire surface of the main body is held. Vibrates, processing accuracy is significantly impaired, and it is difficult to achieve the required run-out accuracy.

From such a problem, it is necessary to increase the allowance for grinding the cylindrical main body. The grinding allowance for the cylindrical main body is generally determined by the shaft runout accuracy and the main body runout accuracy.

At the present time, the body runout accuracy is 0.03
About 0.05mm, and shaft runout accuracy is 0.03 ~
It is about 0.10 mm. At present, a grinding allowance of 0.15 to 0.16 mm is provided on the cylindrical main body for safety in the process.

Here, in order to reduce the grinding allowance,
The effect of reducing the shaft runout accuracy is significant. Generally, the shaft portion is joined by press-fitting the shaft member into the cylindrical main body portion. In such joining, to join accurately,
When all conditions such as shaft inner diameter tolerance, shaft inner diameter coaxiality accuracy, shaft outer diameter accuracy tolerance, coaxiality accuracy, adjustment of coupling device shaft center accuracy, straight conveyance, etc. are satisfied. Although the accuracy is guaranteed, it is difficult to satisfy all the conditions in practice, and the joint deflection accuracy is 0.03 to 0.03.
The current state is about 0.10 mm.

FIG. 4 shows a centerless grinding device E (hereinafter, referred to as a grinding device E) used in the grinding step shown in FIG. 3C. D1 and an adjusting grindstone C, a motor for rotating the same, and a blade B disposed between the stepped outer grindstone Gl and the adjusting grindstone C, and the work W supports the cylindrical surface 1b of the cylindrical body 1. The blade B and the adjusting grindstone C are held along the center axis thereof, and are rotated by the rotation of the adjusting grindstone C (so-called swirling rotation (contact rotation)).

The motor Dl for rotating the stepped outer grinding wheel Gl is mounted on a radial feeder F1 for feeding the stepped outer surface grinding wheel Gl in the radial direction.

As shown in FIG. 5, the stepped outer surface grinding wheel Gl has a small diameter portion S1 longer than the length of the cylindrical surface 1b of the work W and a large diameter portion longer than the length of the shaft portion 2b of the work W. It has a portion S2, and is configured to be able to grind the entire length of the work W without needing axial feed during grinding and kneading.
Also, a step S formed between the small diameter portion S1 and the large diameter portion S2.
Is set to be equal to the difference between the radial finishing dimensions of the cylindrical surface 1b of the work W and the shaft portion 2b.

The workpiece W having undergone the assembling process shown in FIG. 3B is supported by the blade B and the adjusting device C of the grinding device E, and the predetermined feed is performed while rotating the stepped grinding wheel Gl as shown in FIG. The workpiece W is moved in the radial direction at first to perform rough grinding, and then the feed rate is reduced to perform finish grinding, thereby finishing the cylindrical surface 1b and the shaft portion 2b of the work W to a predetermined surface roughness. The grinding allowance for the cylindrical surface 1b of the work W is
In the initial stage of the rough grinding, first, only the small-diameter portion Sl of the stepped outer surface grinding wheel Gl is formed only at the cylindrical surface of the workpiece W, as shown in FIG. By contacting the entire length of 1b, rough centering (centering) of the work W is performed together with rough grinding of the cylindrical surface 1b, and thereafter, the large diameter portion s2 starts rough grinding of the shaft portion 2b. Therefore, the finishing of the work W by the subsequent rough grinding and finish grinding is performed smoothly without generating shaft runout and the like.

As described above, the cylindrical surface 1b and the shaft portion 2b of the work W are stably machined with extremely high shape accuracy by the centerless grinding, and the extremely high coaxiality is obtained between the cylindrical surface 1b and the shaft portion 2b. Is guaranteed.

In such grinding, the grinding feed rate is set at 0.1.
005 mnl / sec or less.

[0092] When the grinding feed speed is 0.005 mm / sec or more, the escape of chips in the pores of the grinding wheel cannot catch up, and scratches are likely to occur. Preferably, 0.005 m
m / sec to 0.002 mm / sec.

[0093] When the grinding feed speed is 0.002 mm / sec or less, the grinding time becomes extremely long, and no further effect is observed on the suppression of scratches.

[0094] If necessary, the inner surface of the end surface opposite to the joint of the shaft portion of the cylindrical body can be cut or ground simultaneously with the grinding. Alternatively, after grinding, the inner surface of the end face can be cut by another cutting device.

The influence of the scratches on the electrophotographic cylindrical member is very large, and leads to image defects.

For example, in the case of the photosensitive drum, if the surface of the base cylinder has a scratch, the photosensitive layer locally becomes uneven, causing image defects such as black spots or white spots.
When such an image defect occurs, it depends mainly on the size of the flaw, though it depends on the thickness of the photosensitive layer.

According to our investigation of the present invention, it is necessary to suppress the roughness of the scratch to an Rmax of 25 μm or less, preferably 15 μm or less.

Regarding the flange member, conventionally,
In consideration of the inclination of the flange member with respect to the cylindrical body, the required accuracy has been satisfied by increasing the accuracy of the single shaft member as high as possible.

However, even in such a conventional method, it is difficult to reduce the grinding allowance due to the inclination at the time of joining, and such a high-precision shaft member is expensive.

The shaft member used in the present method is not required to be a high-precision shaft member as described above, and it is possible to use an inexpensive shaft member, thereby enabling cost reduction.

In the case of the developer carrying member, a paint is applied directly to the surface of the cylindrical member ground by the above-described method to form a resin layer. At this time, conductive carbon, graphite and, if necessary, spherical particles are added to a phenol resin serving as a binder as a paint. The role of the spherical particles is to form irregularities by adding the spherical particles to the resin.
As the spherical particles, spherical particles such as polyamide, silicon, phenol, polystyrene, polymethyl methacrylate, and polyethylene are used. The surface roughness can be controlled by changing the amount of the spherical particles added or the particle size of the spherical particles.

According to the experiments by the inventors, the spherical particles for the developing carrier preferably have a particle size in the range of 1 to 30 μm.
The reason is that when the particle diameter is 1 μm or less, it is difficult to obtain the desired surface roughness, and when the particle diameter is 30 μm or more, the adhesion to the resin is too large. And the spherical particles may be detached.

Instead of adding spherical particles, a plast treatment is performed, and thereafter, a coating material is applied to form a resin layer.

In the case of a cylindrical member serving as the base of the photosensitive drum, after finishing by grinding in this way,
If necessary, the workpiece W is further subjected to a surface finishing process such as a roller burnishing process to reduce the surface roughness of the workpiece W from Rmaxl to
It may be improved to 2 μm or less. The reason is that the photosensitive drum is manufactured by applying a photosensitive film on the surface of a cylindrical member. However, the surface roughness (surface roughness) of the cylindrical part material as finished by grinding is insufficient, and Irregularities may occur, causing defects in the image.

Next, with respect to the cylindrical member according to the present invention, a cylindrical member is prepared by changing some grinding conditions, and the evaluation will be described.

(First Embodiment) A developing carrier was prepared using the cylindrical member according to the first embodiment of the present invention, and its evaluation was performed.

First, the outer diameter is 20.09 mm and the inner diameter is 18.0.
(+0 to 0.052) mm, length 330 mm, material 60
At the drive side end of a cylindrical body made of a drawn cylindrical base tube made of a 00 series aluminum alloy, a flange portion outer diameter of 18.04 ±
A first flange member having a diameter of 0.005 mm and an outer diameter of 12.32 mm was press-fitted.

Next, the outer diameter of the shaft portion was cut by holding both ends of the cylindrical portion with a double-end machining and cutting device.
And After cutting, both ends of the Pl cylinder member were supported, and the run-out of the shaft was measured to be 15 μm. Next, the cylindrical surface and the shaft were ground under the following grinding conditions. "Cylinder surface and" shaft outer diameter grinding conditions "Rough grinding feed rate 0.005 mm / sec Finish grinding feed rate 0.0022 mm / sec Rough grinding allowance (cylindrical face) 0.07 mm Finish grinding allowance (cylindrical face) 0.02 mm Finish grinding allowance (shaft) 0.02 mm Grinding wheel Silicon carbide (SiC) # 120 Grinding wheel rotation speed 1250 rpm Next, in order to improve the charging performance, 10 parts by weight of conductive carbon, 90 parts by weight of graphite, phenol 100 parts by weight of the resin and an IPA solvent are mixed to a solid content of 35%, put into a paint shaker together with glass beads, and dispersed for 5 minutes to make adjustments. The coating liquid is sprayed on a cylindrical surface by an air spray gun. To form a resin layer, and then placed in a drying oven at 150 ° C. for about 30 minutes to thermally cure the coating film.

Next, the magnet roller was inserted into the work, and finally, the second flange member was press-fitted to the inner end face to produce a developing carrier. Both ends of the cylindrical surface were supported and rotated to measure the run-out.

As shown in FIG. 7, the developing carrier Q was measured by using a non-contact laser measuring machine at both ends A,
When the shaft was rotated with reference to the point B as the reference, the vibration f of the drive-side shaft portion and the vibration p of the cylindrical surface were measured at two points. As a result of the measurement,
The runout of the shaft was 1.3 μm, and the runout of the cylindrical surface was 3.2 μm.

Thereafter, the developing carrier Q was mounted on a process cartridge of a laser beam printer manufactured by Canon Inc., and 10,000 images were output intermittently. As a result, defects such as pitch unevenness were observed in both halftone and solid black images. Very good images were obtained without any occurrence.

(Second Embodiment) In a second embodiment according to the present invention, except that the grinding conditions are changed as follows.
A cylindrical member was prepared and evaluated in the same manner as in the first embodiment. "Cylinder surface and shaft outer diameter grinding conditions" Rough grinding feed rate 0.003 mm / sec Finish grinding feed rate 0.0022 mm / sec Rough grinding allowance (cylindrical face) 0.07 mm Finish grinding allowance (cylindrical face) 0.02 mm Finish Grinding allowance (shaft) 0.02 mm Grinding wheel Silicon carbide (SiC) # 120 Grinding wheel rotation speed 1250 rpm “Internal end surface grinding conditions” Grinding allowance 0.1 mm Grinding feed rate 0.016 mm / sec (Third embodiment) A developing carrier was prepared using the cylindrical member according to the third embodiment of the present invention, and its evaluation was performed.

First, the outer diameter is 20.09 mm and the inner diameter is 18.0.
(+0 to 0.052) mm, length 330 mm, material 60
At the drive side end of a cylindrical body made of a drawn cylindrical base tube made of a 00 series aluminum alloy, a flange portion outer diameter of 18.04 ±
A first flange member having a diameter of 0.005 mm and an outer diameter of 12.32 mm was press-fitted.

Then, the both ends of the cylindrical portion were held and the outer diameter of the shaft portion was cut by a double-end machining cutting device.
And After the cutting, when the both ends of the cylindrical member were supported and the run-out of the shaft was measured, it was 15 μm.

Next, the cylindrical surface and the shaft were ground under the following grinding conditions. “Cylinder surface and shaft outer diameter grinding conditions” Coarse grinding feed rate 0.005 mm / sec Finish grinding feed rate 0.0022 mm / sec Rough grinding allowance (cylindrical face) 0.07 mm Finish grinding allowance (cylindrical face) 0.02 mm Finish Grinding allowance (shaft) 0.02 mm Grinding wheel Stone of silicon carbide (SiC) # 120 Grinding wheel rotation speed 1250 rpm Then, the inner surface of one end is cut by a double-sided cutting machine.
Cutting was performed at a depth of 0.1 mm and a length of 5 mm.

Thereafter, a developing carrier was prepared and evaluated in the same manner as in the first embodiment.

(Comparative Example) A developing carrier was prepared using the cylindrical member according to the comparative example of the present invention, and its evaluation was performed.

First, the outer diameter is 20.09 mm and the inner diameter is 18.0.
(+0 to 0.052) mm, length 330 mm, material 60
At the drive side end of a cylindrical body made of a drawn cylindrical base tube made of a 00 series aluminum alloy, a flange portion outer diameter of 18.04 ±
A first flange member having a diameter of 0.005 mm and an outer diameter of 12.32 mm was press-fitted.

Next, the both ends of the cylindrical portion were held and the outer diameter of the shaft portion was cut by a double-end machining cutting device. 02.
After the cutting, when the both ends of the cylindrical member were supported and the run-out of the shaft was measured, it was 15 μm.

Next, the cylindrical surface and the shaft were ground under the following grinding conditions. "Cylinder surface and shaft outer diameter grinding conditions" Rough grinding feed rate 0.007 mm / sec Finish grinding feed rate 0.0022 mm / sec Rough grinding allowance (cylindrical face) 0.07 mm Finish grinding allowance (cylindrical face) 0.02 mm Finish Grinding allowance (shaft) 0.02 mm Grinding wheel Silicon carbide (SiC) # 120 Grinding wheel rotation speed 1250 rpm As a result, scratches were generated over the entire circumference of the work surface with only the 200th grinding wheel after the start of grinding. When the processing was stopped halfway and the blade surface was visually observed, as shown in FIG.
A fusion product of fine aluminum chips was generated. Then, when examining the relationship between the position on the work surface where the scratch has occurred and the position of the sliding object generated on the blade,
It turned out that both positions corresponded.

Table 1 shows the evaluation results of the cylindrical members according to the first to third examples and the comparative example.

[0122]

[Table 1] Therefore, according to the present embodiment, after the surface of the flange portion 2a is cut by the cutting device while supporting the main body portion of the cylindrical body 1, the surface of the cylindrical body 1 and the surface of the flange portion 2a are ground with a grinding wheel. Grinding suppresses runout of the flange portion 2a at the time of grinding, and reduces grinding allowance of the cylindrical body 1 main body. Therefore, even in continuous production, scratches are generated on the cylindrical member main body surface. In addition, high quality surface accuracy and high processing accuracy can be obtained at low cost.

According to the present embodiment, after the surface of the flange 2a is cut by the cutting device while supporting the main body of the cylindrical body 1, the surface of the cylindrical body 1 and the surface of the flange 2a are separated. A resin layer formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel and added with spherical particles having a particle diameter of 1 μm to 30 μm increases the surface accuracy of the cylindrical member main body. Therefore, it is possible to inexpensively realize an image forming apparatus capable of stably obtaining a high-quality image without deteriorating image quality due to irregularities on the surface of the cylindrical member main body.

[0124]

As described above, according to the first aspect of the present invention, the surface of the shaft is cut by the cutting device while supporting the main body of the cylindrical member, and then the main body is cut. By grinding the surface and the surface of the shaft part with a grinding wheel, the run-out of the shaft part during grinding is suppressed, and the grinding allowance of the cylindrical member body part is reduced, so even in continuous production Without causing scratches on the cylindrical member body surface,
High quality surface accuracy and high processing accuracy can be obtained at low cost.

According to the second invention of the present application,
After cutting the surface of the shaft portion with a cutting device while supporting the body portion of the cylindrical member, by grinding the surface of the body portion and the surface of the shaft portion with a grinding wheel, the runout of the shaft portion during grinding is reduced. It suppresses the grinding allowance of the cylindrical member main body part, so that even during continuous production, high quality surface precision and high processing accuracy can be achieved at low cost without generating scratches on the cylindrical member main body surface. Obtainable.

Further, according to the third aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut off. Grinding with a grinding wheel suppresses runout of the shaft during grinding and reduces the grinding allowance of the cylindrical member main body, so scratches occur on the cylindrical member main body surface even in continuous production Without this, high-quality surface precision and high processing precision can be obtained at low cost.

According to the fourth invention of the present application,
After cutting the surface of the shaft portion with a cutting device while supporting the body portion of the cylindrical member, the surface of the body portion and the surface of the shaft portion are ground with a grinding wheel, and the inner surface of the body portion is an inner surface grinding wheel. Or, by grinding or cutting with an internal cutting tool, the runout of the shaft during grinding is suppressed, and the grinding allowance of the cylindrical member main body is reduced, so even in continuous production, Without causing scratches,
High quality surface accuracy and high processing accuracy can be obtained at low cost.

Further, according to the fifth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the main body and the surface of the shaft are removed. Grinding with a grinding wheel, and grinding or cutting the inner surface of the main body with an inner grinding wheel or an inner cutting tool, suppresses deflection of the shaft during grinding and reduces the grinding allowance of the cylindrical member main body. As a result, high quality surface precision and high processing precision can be obtained at low cost without causing scratches on the surface of the cylindrical member body even in continuous production.

Further, according to the sixth invention of the present application,
After cutting the surface of the shaft portion with a cutting device while supporting the body portion of the cylindrical member, the surface of the body portion and the surface of the shaft portion are ground with a grinding wheel, and the inner surface of the body portion is an inner surface grinding wheel. Or, by grinding or cutting with an internal cutting tool, the runout of the shaft during grinding is suppressed, and the grinding allowance of the cylindrical member main body is reduced, so even in continuous production, Without causing scratches,
High quality surface accuracy and high processing accuracy can be obtained at low cost.

Further, according to the seventh aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut off. By grinding with a grinding wheel, and then cutting the inner surface of the main body with a cutting blade, the runout of the shaft during grinding is suppressed, and the grinding allowance of the cylindrical member main body is reduced. Even in continuous production, high-quality surface precision and high processing precision can be obtained at low cost without causing scratches on the surface of the cylindrical member main body.

According to the eighth invention of the present application,
After cutting the surface of the shaft portion with a cutting device while supporting the main body portion of the cylindrical member, the surface of the main body portion and the surface of the shaft portion are ground with a grinding wheel, and then the inner surface of the main body portion is cut with a cutting tool. By cutting, the runout of the shaft during grinding is suppressed, and the grinding allowance of the cylindrical member main body is reduced, so that even in continuous production, the surface of the cylindrical member main body is not damaged. In addition, high quality surface accuracy and high processing accuracy can be obtained at low cost.

Further, according to the ninth invention of the present application, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut off. By grinding with a grinding wheel, and then cutting the inner surface of the main body with a cutting blade, the runout of the shaft during grinding is suppressed, and the grinding allowance of the cylindrical member main body is reduced. Even in continuous production, high-quality surface precision and high processing precision can be obtained at low cost without causing scratches on the surface of the cylindrical member main body.

Further, according to the tenth aspect of the present invention,
After cutting the surface of the shaft with a cutting device while supporting the body of the cylindrical member, the surface of the body of the cylindrical member obtained by grinding the surface of the body and the surface of the shaft with a grinding wheel Since the resin layer formed on the surface of the cylindrical member increases the surface accuracy of the cylindrical member main body, it is possible to stably obtain a high-quality image without deteriorating the image quality due to irregularities on the surface of the cylindrical member main body. An image forming apparatus that can be realized can be realized at low cost.

Further, according to the eleventh aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. And a resin layer to which spherical particles having a particle size of 1 μm to 30 μm are added and which is formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel, so as to enhance the surface accuracy of the main body of the cylindrical member. Therefore, it is possible to inexpensively realize an image forming apparatus capable of stably obtaining a high-quality image without deteriorating the image quality due to irregularities on the surface of the cylindrical member main body.

According to the twelfth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel increases the surface accuracy of the main body of the cylindrical member. An image forming apparatus capable of stably obtaining a high-quality image without lowering the image quality can be realized at low cost.

Further, according to the thirteenth aspect of the present invention, after the surface of the shaft is cut by the cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. And a resin layer to which spherical particles having a particle size of 1 μm to 30 μm are added and which is formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel, so as to enhance the surface accuracy of the main body of the cylindrical member. Therefore, it is possible to inexpensively realize an image forming apparatus capable of stably obtaining a high-quality image without deteriorating the image quality due to irregularities on the surface of the cylindrical member main body.

According to the fourteenth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel increases the surface accuracy of the main body of the cylindrical member. An image forming apparatus capable of stably obtaining a high-quality image without lowering the image quality can be realized at low cost.

According to the fifteenth aspect of the present invention, after the surface of the shaft is cut by a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. The resin layer formed on the surface of the main body of the cylindrical member obtained by grinding with a grinding wheel increases the surface accuracy of the main body of the cylindrical member. An image forming apparatus capable of stably obtaining a high-quality image without lowering the image quality can be realized at low cost.

Further, according to the sixteenth aspect of the present invention, after the surface of the shaft is cut with a cutting device while supporting the body of the cylindrical member, the surface of the body and the surface of the shaft are cut. And a resin layer to which spherical particles having a particle diameter of 1 μm to 30 μm are added and which is formed on the surface of the main body of the cylindrical member obtained by grinding with Therefore, it is possible to inexpensively realize an image forming apparatus capable of stably obtaining a high-quality image without deteriorating the image quality due to irregularities on the surface of the cylindrical member main body.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an electrophotographic apparatus as an example of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a signal path of a control system when the electrophotographic apparatus of FIG. 1 is used as a facsimile.

3A and 3B are diagrams illustrating a manufacturing configuration of a latent image carrier and a developer carrier provided in the image forming apparatus of FIG.
FIG. 2 is a cross-sectional view of a cylindrical member, FIG. 2 (b) is a diagram illustrating a process of forming a work by connecting a first flange member to a cylindrical body, and FIG. (D) is a diagram illustrating a process of inserting a magnet roller into a work, and (e) is a diagram illustrating a process of coupling a second flange member to the work.

FIG. 4 is a schematic configuration diagram of a centerless grinding device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram showing a grinding state of the centerless grinding device of FIG. 4;

FIG. 6 is a schematic configuration diagram of a grinding device according to a second embodiment.

FIG. 7 is a diagram illustrating a portion for measuring the run-out of the developer carrier.

FIG. 8 is a schematic configuration diagram of a centerless grinding device.

FIG. 9 is a view showing a state in which the centerless grinding device is fused to the surface of the workpiece and the surface of the blade where the scratch has occurred.

FIG. 10 is a diagram illustrating a mechanism of scratch generation in the centerless grinding device.

[Explanation of symbols]

 Reference Signs List 1 cylindrical body (main body) 2a flange (shaft) 53 photosensitive drum (latent image carrier, cylindrical member) 54 developing means (developing device) 54a developing sleeve (developer carrier, cylindrical member) E stepped grinding Equipment (centerless grinding equipment) P Transfer material (recording medium) W Work (tubular member)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H068 AA54 EA05 EA07 2H077 AD06 FA00 FA03 FA13 FA25 FA27 3C043 AA08 AA12 CC03

Claims (16)

[Claims] 1. A method of manufacturing a cylindrical member by processing a cylindrical member with a centerless grinding device to form a cylindrical member, wherein the surface of the cylindrical member having a shaft at one end of a cylindrical main body is rotatable. In the method of manufacturing a cylindrical member that rotates and grinds the grinding wheel while abutting on a stepped grinding wheel, after cutting the surface of the shaft portion with a cutting device while supporting the body portion, the surface of the body portion and A method for producing a cylindrical member, characterized by grinding the surface of the shaft portion with a grinding wheel. 2. The method for manufacturing a cylindrical member according to claim 1, wherein a grinding allowance of the main body portion of the cylindrical member is set to be larger than a grinding allowance of the shaft portion. 3. The deflection amount of the shaft portion when the cylindrical member is rotated with reference to the peripheral surfaces at both ends of the cylindrical member body before grinding is 20 μm or less. A method for producing a cylindrical member according to claim 2. 4. A method for producing a cylindrical member, wherein the cylindrical member is processed by a centerless grinding device into a cylindrical member, wherein the surface of the cylindrical member having a shaft at one end of a cylindrical body is rotatable. While rotating and grinding the grinding wheel while making contact with a stepped grinding wheel, in the method of manufacturing a cylindrical member that grinds or cuts the inner surface of the body portion with an inner grinding wheel or an inner cutting tool, supports the body portion. While cutting the surface of the shaft portion with a cutting device, while grinding the surface of the main body portion and the surface of the shaft portion with a grinding wheel, the inner surface of the main body portion is ground with an inner grinding wheel or an inner cutting tool. A method for producing a cylindrical member, characterized by cutting. 5. The method for manufacturing a cylindrical member according to claim 4, wherein a grinding allowance of the main body portion of the cylindrical member is set larger than a grinding allowance of the shaft portion. 6. The deflection amount of the shaft portion when the cylindrical member is rotated with reference to the peripheral surfaces at both ends of the cylindrical member main body before grinding is 20 μm or less. A method for producing a cylindrical member according to claim 5. 7. A method for producing a cylindrical member by processing a cylindrical member with a centerless grinding device to form a cylindrical member, wherein the surface of the cylindrical member having a shaft at one end of a cylindrical main body is rotatable. In the method of manufacturing a cylindrical member that rotates and grinds the grinding wheel while abutting on a stepped grinding wheel, after cutting the surface of the shaft portion with a cutting device while supporting the body portion, the surface of the body portion and A method for manufacturing a cylindrical member, comprising: grinding a surface of the shaft portion with a grinding wheel; and thereafter cutting an inner surface of the main body portion with a cutting blade. 8. The method for manufacturing a cylindrical member according to claim 7, wherein a grinding allowance of the main body portion of the cylindrical member is set to be larger than a grinding allowance of the shaft portion. 9. The cylindrical member according to claim 7, wherein the amount of deflection of the shaft portion when rotating with reference to the peripheral surfaces at both ends of the cylindrical member body before grinding is 20 μm or less. A method for producing a cylindrical member according to claim 8. 10. A cylindrical member manufactured by the method for manufacturing a cylindrical member according to any one of claims 1 to 9, wherein a resin layer is formed on a surface of the main body. Cylindrical member. 11. A resin layer to which spherical particles having a particle size of 1 μm to 30 μm are added.
4. The cylindrical member according to 1. 12. A developing device for applying a developer to a latent image formed on a latent image carrier to convert the latent image into a visible image, comprising a developer carrier carrying the developer. ,
A developing device, wherein the developer carrier is the cylindrical member according to claim 10. 13. The resin layer according to claim 12, wherein spherical particles having a particle size of 1 μm to 30 μm are added.
3. The developing device according to claim 1. 14. An image forming apparatus for recording an image formed by a series of image forming processes on a recording medium, comprising: a latent image carrier for carrying a latent image;
An image forming apparatus, comprising: a cylindrical member manufactured by the method for manufacturing a cylindrical member according to claim 1. 15. An image forming apparatus for recording an image formed by a series of image forming processes on a recording medium, comprising: a latent image carrier for carrying a latent image; and a developing device according to claim 12. An image forming apparatus, wherein the latent image carrier is a cylindrical member manufactured by the method for manufacturing a cylindrical member according to any one of claims 1 to 9. 16. The resin layer according to claim 15, wherein spherical particles having a particle diameter of 1 μm to 30 μm are added.
An image forming apparatus according to claim 1.