JP2000132000A - Cylindrical member, developing sleeve and photosensitive drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to subject end part-engaging members and a cylindrical member to always strong coupling and to locally limit the range of the end part deformation of the cylinder by coupling the end part-engaging members to a cylindrical body via annular materials having the coefficient of thermal expansion approximately equal to the cylindrical body. SOLUTION: The cylindrical member 1 is constituted by securely coupling the end part-engaging members 1, of which the main portions consist of resins, to the cylindrical body 5 by the annular members 3 having the thermal expansion approximately equal (a range not exceeding 20% of the upper and lower ranges of the coefficient of thermal expansion of the cylindrical body 5), then coupling these members to the cylindrical member by press-fitting, adhering, heating and cooling. Namely, part of the cylinder is not subjected to machining, such as bending and cutting, by which the range of the end part deformation of the cylinder is extremely reduced and the device may be made compact. Further, the end part-engaging members of which the main portions consist of the resins are coupled via the material having the coefficient of thermal expansion approximately equal to the coefficient of thermal expansion of the cylindrical body and, therefore, the relaibility of the coupling may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical member used for an electrophotographic apparatus such as a copying machine, a printer, and a facsimile.

[0002]

2. Description of the Related Art Conventionally, a cylindrical electrophotographic photosensitive member (hereinafter simply referred to as a photosensitive drum) has a main part for rotating the photosensitive drum at both ends of a cylinder having a photosensitive conductive material coated on its surface. An end engaging member such as a drum gear or a drum flange (hereinafter simply referred to as a gear or a flange) is bonded with an adhesive or pressed into a drum cylinder by external pressure to be joined to a cylinder. Was.

[0003] As a method of bonding, an appropriate amount of adhesive is applied to a portion where a gear or a flange is inserted into a cylinder, and after fitting, the adhesive is not affected by temperature and humidity until the adhesive is completely cured. It was stored in a place (environment) and completely cured. As the type of adhesive used for bonding, an instantaneous adhesive or an adhesive primer and an anaerobic adhesive are mainly used, and they are appropriately used depending on the use, purpose, required strength and the like.

[0004] However, the above-mentioned conventional photosensitive drum has some disadvantages described below.

(1) Environment under high temperature and high humidity (for example, temperature:
(32.5 ° C., relative humidity: 85%), and when completely cured in the same environment, the moisture contained in the air adversely affects the bonding surface during the curing, so that the torque strength is reduced. . (2) Some types of adhesive require an extremely long curing time to completely cure the adhesive,
It is necessary to secure a storage space during that time and to provide equipment for keeping the temperature and humidity of the storage environment constant, and there are many disadvantages in terms of cost, management, and productivity. (3) In order to obtain high adhesive strength, the material of the gear or the flange is limited. (4) When providing an electrode plate in contact with the inner surface of the cylinder at the end of the gear or flange to establish conduction with the apparatus main body, the adhesive is dripped before the adhesive is completely cured after bonding, and the electrode plate In some cases, the adhesive flowed into the contact portion between the metal and the inner surface of the cylinder, causing poor conduction. (5) In the case of fitting by press fitting, the coupling force between the gear or the flange and the cylinder was insufficient.

As members having different coefficients of thermal expansion, for example,
11-16 × 10 ⁻⁶ l / ° C. steel or 20-24 × 10
^In the bonding between aluminum at ^-6 l / ° C. and a resin such as polyacetal at 65 to 85 × 10 ^-6 l / ° C., that is, as described above, the coefficient of thermal expansion is significantly different. Is greatly shrinked, so that a gap is generally formed between the cylindrical body made of aluminum and the end engaging member whose main part is made of resin, and there is a concern that the end engaging member is loose or the strength is reduced. It had been.

In order to solve such a problem, Japanese Patent Laid-Open Publication No.
189498, a cylindrical member having an end engaging member at at least one end, wherein the cylindrical end is bent and cut into a concave portion of an insertion portion of the end engaging member into the cylindrical end, and is joined. However, there has been a demand for a further compact device having a cylindrical member. In addition, there has been a demand for a joining method in which end deformation due to joining is small.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stable and strong connection between an end engaging member whose main part is made of resin and a cylindrical member, and to connect the end engaging member and the cylindrical member with each other. It is still another object of the present invention to provide a cylindrical member, a developing sleeve, and a photosensitive drum, which have a very small deformation range of the end portion of the cylinder and make the apparatus compact.

[0009]

According to the present invention, there is provided a cylindrical member having an end engaging member having a thermal expansion coefficient different from that of the cylinder at at least one end of the cylinder, wherein the end engaging member is substantially equivalent to the cylindrical body. A cylindrical member, a developing sleeve, and a photosensitive drum that are connected via an annular material having a coefficient of thermal expansion are provided.

[0010]

Embodiments of the present invention will be described below in detail.

[0011] In the cylindrical member according to the present invention, the end engaging member whose main part is made of resin has a thermal conductivity substantially equal to that of the cylindrical body (a range not exceeding 20% of the lower and upper ranges of the thermal expansion coefficient of the cylindrical body). After being firmly joined by the expanding annular member, it is joined to the cylindrical member by press-fitting, bonding, heating and cooling.

That is, by not subjecting a part of the cylinder to mechanical processing such as bending and cutting, the range of deformation of the end of the cylinder is extremely reduced, which contributes to downsizing of the apparatus. Further, since the end engaging member whose main part is made of resin is connected via a material having a thermal expansion coefficient substantially equal to that of the cylindrical body, reliability of the connection can be obtained.

The cylindrical member according to the present invention requires a strong connection between each image holding member cylinder including the photosensitive drum and the developing sleeve and the end engaging member and a connection with little end deformation due to the connection. It is also effective as various roller members for transmitting a driving force such as a roller and a fixing roller.

The photosensitive drum has various configurations in order to obtain predetermined characteristics or according to the type of an electrophotographic process to be applied. As a typical example of electrophotography, a photosensitive drum having a photoconductive layer formed on a cylinder and a photosensitive drum having a protective layer on the surface are widely used. A photosensitive drum composed of a cylinder and a photoconductive layer is used for image formation by the most common electrophotographic process, that is, charging, image exposure and development, and, if necessary, transfer. Also, for a photosensitive drum with a protective layer, this protective layer may be used to protect the photoconductive layer, improve the mechanical strength of the photosensitive drum, improve the dark decay characteristics, or be applied to certain electrophotographic processes, etc. It is provided for the purpose.

Some typical other image holding members will be described below.

(1) For the purpose of improving the reusability of the electrophotographic photosensitive member, the electrostatic image formed on the electrophotographic photosensitive member is transferred to another image holding member and developed, and then the toner image is recorded. Transcribed to the body.

(2) Another electrophotographic process for forming an electrostatic image on another image holding member corresponding to the electrostatic image formed on the electrophotographic photosensitive member is a screen having a large number of fine openings. An electrostatic image is formed on a cylindrical electrophotographic photosensitive member by a predetermined electrophotographic process, and a corona charging process is performed on another image holding member via the electrostatic image, thereby modulating the corona ion flow and statically. A process of forming an electric image on another image holding member, developing the image with toner, transferring the image to a recording medium, and forming a final image can be exemplified.

(3) According to another electrophotographic process, a toner image formed on an electrophotographic photosensitive member or another image holding member is transferred directly to another image holding member without being directly transferred to a recording member. Then, the toner image is transferred from the image holding member to a recording medium and fixed. This process is particularly effective for forming a color image or high-speed copying. Generally, the recording medium is often made of paper and film and has a high degree of flexibility, so that there is almost no deformation compared to transferring the three-color image to the recording medium while accurately aligning the three-color images. When a three-color image is transferred to an image holding member that can be formed of such a material, and the three-color image is transferred to a recording medium at a time, a more accurate aligned color image is formed. In addition, it is effective to transfer the toner image to the recording medium with the diameter of the image holding member also for the high-speed copying.

(4) As another process, an electric signal is applied to the multi-needle electrode to form an electrostatic image corresponding to the electric signal on the surface of the image holding member, and then developing the image to form an image. Can be.

The image holding member used in the electrostatic image forming process as described in (1) to (4) does not require a photoconductive layer. As described above, examples of the image holding member on which an electrostatic image or a toner image is formed include various members having a surface layer of an insulating layer, including an electrophotographic photosensitive member having a surface layer of a protective layer or a photoconductive layer. Is used.

A typical method for manufacturing a cylindrical member according to the present invention is as follows.

An end engaging member whose main part is made of resin is
An annular material made of the same material as the cylindrical member made of aluminum, copper, stainless steel or the like is inserted. For the end engaging member whose main part is made of resin, engineering plastics such as polycarbonate, polyacetal and polyphenylene sulfide are used, and polyacetal and polycarbonate are preferably used from the viewpoint of cost and wear resistance.
Appropriate shape (width, height,
(A depth or the like). By hitting the end of the annular material inserted into the recess with an abutting member having an acute angle at the tip and having substantially the same width as the recess, the end is brought into the recess with a certain amount of penetration from that position. By inwardly moving toward the inside, bending and shearing are performed almost simultaneously with the end part along the concave shape, and the cut surface of the bent end is fitted in a state in which it is closely adhered to the concave shape, Further, the inner surface of the bent end is joined in a state of being in close contact with the bottom surface of the concave portion.

Then, press-fit into the cylindrical end. At the time of press fitting, the outer diameter of the connecting portion of the end engaging member is set to be 5 to 40 μm larger than the inner diameter of the cylindrical body. If it is less than 5 μm, the strength after bonding is insufficient, and it may come off when driven under strong pressure. On the other hand, if it exceeds 40 μm, it is unnecessary from the viewpoint of strength, and the resistance is too large at the time of press-fitting, so that it may be bent and press-fitted or not completely press-fitted.

According to this method, since the cylindrical body and the end engaging member are joined by the same material, there is no difference due to expansion and contraction due to temperature change, and the initial strength of the joint is maintained. is there. Further, since the cylindrical body is not subjected to mechanical processing, for example, processing such as bending and cutting, deformation of the end of the cylindrical body is reduced.

In the press-fitting method, one or both of the cylindrical body and the annular material are subjected to knurling such as a groove and then press-fitted, so that the bonding strength can be increased. In this method, the outer diameter of the connecting portion of the end engaging member can be made smaller than the inner diameter of the cylindrical body by 5 to 20 μm, thereby having an effect of reducing the influence of bending or the like due to press fitting.

Another method of press-fitting is bonding. In this method, the outer diameter of the connecting portion of the end engaging member is
The range may be 5 to 20 μm smaller than the inner diameter of the cylindrical body. By such a method, the influence of bending or the like at the time of press fitting is further reduced. The bonding strength is basically obtained by bonding.

According to this method, since the cylindrical body and the end engaging member are joined by the same material, there is no difference due to expansion and contraction due to temperature change, and the initial strength of the joint is maintained. is there. Further, since the cylindrical body is not subjected to mechanical processing, for example, processing such as bending and cutting, deformation of the end of the cylindrical body is reduced. As the type of the adhesive used for bonding, an instantaneous adhesive or an adhesive primer and an anaerobic adhesive are mainly used, but are not limited thereto.

As another method of press-fitting, the connection can be made by heating the cylindrical body or cooling the end engaging member. This is achieved by expanding the diameter by heating the cylinder,
Alternatively, the shrinkage due to cooling of the end engaging member causes a loose fit state in the connection. Then, while returning to room temperature,
It is inserted into the end of the cylindrical body so as to match the axis of the cylindrical body, and is joined to the opposing surface of the cylindrical body by bringing the opposing surface of the end engaging member into contact.

According to this method, there is no influence of bending or the like at the time of press-fitting, and an accurate connection can be obtained. The outer diameter of the connecting portion of the end engaging member is 5 to 4 times larger than the inner diameter of the cylindrical body.
It is preferable to set the range larger by 0 μm. Such a method has the advantage of cost since no adhesive is applied.

The cylindrical member and the annular material are preferably the same material, and aluminum is often used for such a cylindrical member. Therefore, aluminum is also preferred for the annular material.

Hereinafter, the case where a photosensitive drum is used as the cylindrical member will be described with reference to the drawings.

FIG. 1 is a sectional view of a photosensitive drum according to the present invention. In the figure, reference numeral 1 denotes a gear or flange coupled to an end of the photosensitive drum for supporting and rotating the photosensitive drum, 2 denotes a concave portion provided at a fitting portion of the gear or flange with an annular material, and 3 denotes a recess. An annular material 5 is formed of an aluminum alloy. Reference numeral 5 denotes a cylindrical body formed of an aluminum alloy, and has a photoconductive layer 6 coated with a photosensitive material on its surface. The annular material 3 fitted with the gear or flange 1 is fitted with a certain fit tolerance.

FIG. 2 is a sectional view of a step of cutting and bending an annular material, and FIG. 3 is a plan view thereof. 4 is to engage the gear or the flange 1 with the annular material 3 and then enter and contact the end of the annular material 3 toward the recess 2 provided in the gear or the flange 1 to perform bending and shearing. Butting member. The gear or flange 1 and the annular material 3 are fitted along the outer diameter of the fitting portion of the gear or flange 1. At this time, the fitting between the gear or flange 1 and the annular material 3 is preferably such that there is no backlash between the two and there is no deformation with respect to the outer diameter of the annular material 3. More specifically, the clearance between the gear or flange 1 and the annular material 3 is preferably 0 to 10 μm.

Next, the gear or flange 1 and the annular material 3
After the fitting, the abutting member 4 in the form of a claw having an acute angle at the tip thereof from the outer peripheral portion of the annular material 3 is provided at two places in the circumferential direction of the gear or flange 1 as shown in FIG. ~ 4
It comes into contact with the outer peripheral surface of the annular material 3 from a location. At this time, the position of the height of the abutting member 4 is the same as the position of the end face of the annular material 3, and the fitting position of the gear or the flange 1 fitted inside the annular material 3. The width of the recess 2 provided and the width of the tip end of the abutting member 4 have substantially the same width, and the abutting member 4 moves in a state where there is no deviation in the positional relationship, and the outer peripheral portion of the annular material 3 Contact

When the abutting member 4 enters the inside of the gear or the flange 1 with a certain amount of intrusion from the contact point, the abutting member 4 follows the surface shape of the abutting member 4 from the end of the annular material 3. Bends, and as the approach proceeds further, the concave portion 2 provided in the fitting portion of the gear or flange 1
The end of the annular material 3 along the width of the ring 3 is sheared, and the end of the partially bent annular material 3 is fixed in tight contact with the shape of the recess 2 and is connected to the gear or flange 1 and the annular shape. Material 3 is bonded.

At this time, more preferably, the abutting member 4
, The end of the annular material 3 is completely sheared, and the sheared cross section is in a state of being in close contact with the shape of the recess 2. Due to such a state, the shear surface of the partially bent end is
Since it is tightly connected to the recess 2 provided in the fitting portion of the gear or the flange 1, it is possible to maintain a higher connecting force without causing backlash or looseness in the rotation direction and the axial direction. Become. Further, as shown in FIG. 4, the position of the concave portion 2 provided on the gear or the flange 1 at this time may be as large as two, three, four, eight or the like.

Here, the length of the annular material is 1 to 6
mm. If it is less than 1 mm, it is difficult to obtain a bonding strength. If it exceeds 6 mm, it is an unnecessary length. Also, 6
mm, press-fitting into the cylindrical body, etc., may cause deformation of the cylindrical body end over a wide range,
Also, there is a possibility that the connection may bend.

FIG. 5 is an explanatory view of the dimensional relationship in the step of bending off the annular material end. A shown in FIG. 5 is the amount of penetration of the abutting member 4 from the position in contact with the outer peripheral surface of the annular material 3 toward the inside of the annular material 3;
By adjusting the amount of entry a, it is possible to control the coupling force between the gear or flange 1 and the annular material 3.

B is the thickness of the annular material 3 and is generally a drawn tube made of aluminum as a base material. In the following examples, Kobe Steel Co., Ltd. (trade name: H63)
S, wall thickness: 0.7 mm, tube outer diameter: 28.5 mm, tube inner diameter: 27.08 mm, length: 2.0 mm). The thicker the thickness b, the greater the coupling torque strength. However, if the thickness b is too large, a very large force is required when cutting the end of the cylinder 3 into the abutting member 4, so that the surrounding area is large. To affect the dimensional accuracy of the part,
In the case of the cylindrical dimensions as described above, it is preferable that the dimension be within 0.3 to 1.5 mm. More preferably, it is desirable to be in the range of 0.6 to 1.0 mm.

The tip angle e of the abutting member 4 can be freely set according to its shape and the like, but basically forms an acute angle,
Preferably 10 to 70 °, more preferably 20 to 40 °
Good range. In the examples described later, a claw-shaped abutment member composed of a smooth surface was used, the tip angle of which was 30 ° and the width was 3 mm.

F is the length of the cut end when the sheared surface of the cylinder 3 is cut with respect to the concave portion 2, and the larger the cut length, the greater the bonding force. This cut length f
Depends on the amount of approach a, but is preferably 0.2 m
m, more preferably 0.4 mm or more.

FIG. 6 is an explanatory diagram of the dimensional relationship of the concave portions of the gear or the flange. c is the width dimension of the recess 2 provided in the gear or flange 1, and d is the height dimension of the recess 2. The dimensions of these recesses 2 can be appropriately set to any values depending on the outer diameter, wall thickness, etc. of the drum cylinder, but in the case of the above-mentioned annular material dimensions,
It is desirable that the width dimension c is 1.0 mm or more and the height dimension is 0.5 mm or more. Further, the shape of the concave portion 2 is not limited to such a square hole shape, and the shape and size of the concave portion 2 may be determined by the shape or outer diameter of the gear or flange 1 such as a round hole shape, an arc shape, a triangular hole shape, or the like. The shape may be set, and the shape of the tip of the abutting member 4 may be freely changed according to the shape and size. The width of the cylindrical end bent into the recess is preferably a value of width of the recess × 0.95 to 1, particularly preferably the same as the width of the recess.

Next, a description will be given of a method of connecting the end engaging member, in which the annular material is cut and bent to the concave portion of the end engaging member made of resin, and is joined to the cylindrical body.

As the press-fitting method, a commonly used press-fitting device can be used. In order to improve the coupling accuracy, it is preferable to align the end engaging member with the axis of the cylindrical body.

The bonding method is such that an appropriate amount of adhesive is applied to a portion of the end engaging member to be inserted into the cylindrical body, and after fitting, the influence of temperature and humidity is small until the adhesive is completely cured. Preferably, it is stored in the environment and completely cured. As the adhesive, a commonly used adhesive can be used, but it is preferable to use a cyanoacrylate-based adhesive called an instant adhesive. That is, the curing action is fast, and the positioning can be obtained in a short time by the initial bonding. As a method of applying the adhesive, the adhesive may be applied to the inner surface of the fitting portion of the cylindrical body, or may be applied to both.

As a method by heating or cooling, the fitting portion of the end engaging member and the inner diameter of the cylindrical body are set to a size such that there is an interference fit, and the clearance between the end engaging member and the cylindrical body is set. After the cylindrical body is heated to a predetermined temperature to expand the diameter so as to have a fitting relationship, the end engaging member is fitted to the axis of the cylindrical body. Or, after cooling the end engagement members so that the end engagement members also have the same loose fit relationship,
The end engaging member is fitted in accordance with the axis of the cylindrical body. At this time, it is preferable that the opposing surface of the end engaging member abuts on the opposing surface of the cylindrical body.

As a heating device, a high-frequency heating device, a cartridge hitter, a halogen lamp, a xenon lamp, or the like can be used, but a high-frequency heating device is preferable because partial heating can be performed in a short time. As a cooling device, a method using liquid nitrogen is used, but a method using a high-frequency heating device is preferable from the viewpoint of cost and easy handling.

In such fitting, a groove process such as knurling can be performed on the fitting portion of the annular material of the end engaging member. Such uneven portions have the effect of increasing the bonding strength by acting on the inner surface of the cylindrical body. For such knurling, a commonly used method can be used.

FIG. 8 shows a schematic configuration of an electrophotographic apparatus using a process cartridge having a photosensitive drum of the present invention.

In the drawing, reference numeral 101 denotes a drum-shaped electrophotographic photosensitive member of the present invention, which is driven to rotate around an axis 101a in a direction of an arrow at a predetermined peripheral speed. In the rotation process, the photoreceptor 101 is uniformly charged with a predetermined positive or negative potential on its peripheral surface by the primary charging means 102, and then outputs from an image exposure means (not shown) such as slit exposure or laser beam scanning exposure. It receives image exposure light L that has been enhanced and modulated according to the time-series electrical digital image signal of the desired image information. Thus, an electrostatic latent image corresponding to the target image information is sequentially formed on the peripheral surface of the photoconductor 101.

The formed electrostatic latent image is then transferred to developing means 1
The toner-developed image developed by toner 04 is transferred to a photosensitive member 101 and a transfer unit 105 from a paper supply unit (not shown).
The toner image formed and carried on the surface of the photoconductor 101 is sequentially transferred to the transfer material P taken out and fed in synchronization with the rotation of the photoconductor 101 by the transfer unit 105.

The transfer material P to which the toner image has been transferred is separated from the surface of the photoreceptor, introduced into the image fixing means 108, and subjected to image fixing, thereby being printed out of the apparatus as an image formed product (print, copy). You.

The surface of the photoreceptor 101 after the image transfer has been cleaned by removing the untransferred toner by the cleaning means 106, and further subjected to a charge removal treatment by pre-exposure light 107 from a pre-exposure means (not shown). Thereafter, it is repeatedly used for image formation. When the primary charging unit 102 is a contact charging unit using a charging roller or the like, the pre-exposure is not necessarily required.

In the present invention, a plurality of components such as the above-described electrophotographic photosensitive member 101, primary charging means 102, developing means 104, and cleaning means 106 are integrally connected as a process cartridge. This process cartridge may be configured to be detachable from a main body of an electrophotographic apparatus such as a copying machine or a laser beam printer. For example, the primary charging unit 102, the developing unit 10
At least one of the cleaning means 106 and the cleaning means 106 is integrally supported together with the photoreceptor 101 to form a cartridge, and the process cartridge 110 can be attached to and detached from the apparatus main body by using a guide means such as a rail 109 of the apparatus main body.

When the electrophotographic apparatus is a copying machine or a printer, the image exposure light L is reflected and transmitted from the original, or the original is read by a sensor and is converted into a signal. Laser beam scanning,
Light emitted by driving the LED array, driving the liquid crystal shutter array, and the like.

The present invention can be widely used not only for electrophotographic copying machines but also for electrophotographic applications such as laser beam printers, CRT printers, LED printers, liquid crystal printers, and laser plate making.

[0057]

The present invention will be described in more detail with reference to the following examples.

(Example 1) Aluminum drawing cylinder manufactured by Kobe Steel Ltd. (product name: H63S, inner diameter of fitting portion: φ2)
8.50mm, wall thickness: 0.7mm, length: 260.5m
m) aqueous ammonia solution of casein (casein 11.2 g 28% ammonia water 1)
g, water 222mm) by the dip coating method,
After drying, an undercoat layer having a coating amount of 12.0 g / m was formed.

Next, 1 part by weight of aluminum chloride phthalocyanine, butyral resin (trade name: ESLEC B)
M-2: 1 part by weight of Sekisui Chemical Co., Ltd.) and 30 parts by weight of isopropyl alcohol were dispersed by a ball mill disperser for 4 hours. This dispersion was applied on the previously formed undercoat layer by a dip coating method and dried to form a charge generation layer. At this time, the film thickness was 0.3 μm.

Next, 1 part by weight of a hydrazone compound, 1 part by weight of a polysulfone resin (trade name: P1700, manufactured by Union Carbide Co., Ltd.) and 6 parts by weight of monochlorobenzene were mixed and dissolved by stirring with a stirrer. This liquid was applied on the charge generation layer by a dip coating method, and dried to form a charge transport layer. At this time, the film thickness was 12 μm.

A drum gear (fitting portion outer diameter φ28.49 mm, manufactured by injection molding a polyacetal resin (trade name: DURACON M90-02, a polypolymer manufactured by Polyplastics Co., Ltd.), the nozzle temperature was 200 ° C.,
Cylinder temperature: 180 ° C. at tip, 170 ° C. at middle, 160 ° C. at rear, injection pressure: 800 Kg / cm ² , mold temperature: 60 ° C. at mold, 60 ° C. at core, square-shaped recess (width 3 mm, height) (1.5 mm, depth 3 mm) were provided at four places in the direction perpendicular to the center of the gear or flange.

Next, an annular material of an aluminum drawing cylinder (H63S, fitting part inner diameter φ27.08 mm, fitting part outer diameter φ28.49 mm, length 3 mm) manufactured by Kobe Steel Ltd. was inserted. Next, the width of the tip portion is 3 m with respect to the concave portion.
m, an angle of 30 degrees, a striking member made of material SKD30, struck at an infeed amount of 2.5 mm, bent the end of the annular material along the shape of the concave portion, sheared, and engaged the gear or flange with the annular. Materials were combined. At this time, the cut length of the end portion in the sheared portion was 1.4 mm.

Next, the difference between the axis of the photosensitive drum and the axis is 2
It was press-fitted with a device adjusted to 0 μm. The photosensitive drum thus obtained was mounted on a process cartridge of a modified Canon laser beam printer, and this process cartridge was left under high temperature and high humidity (temperature 32.5 ° C., relative humidity 85%) for 5 days. . Then, it was left under low temperature and low humidity (temperature 15 ° C., relative humidity 10%) for 5 days. After that, the device was installed in the main body under a normal environment, and an image was output intermittently. As a result, a good image was obtained.

Thereafter, the photosensitive drum was removed from the process cartridge, and no influence such as looseness, looseness, and separation was observed at the joint between the gear or the flange and the cylinder. Also,
The range of deformation of the end of the photosensitive drum was as small as 4 mm.
Further, when the photosensitive drum was fixed and the torque was measured with a commercially available torque gauge, it was 30 kg / cm ² or more.

(Example 2) The aluminum drawing cylinder manufactured by Kobe Steel Co., Ltd. in Example 1 was replaced with an aluminum drawing cylinder manufactured by Kobe Steel (H63S, inner diameter of fitting portion φ2).
7.08mm, fitting part outer diameter φ28.49mm, length 3m
The material was changed into the annular material of m) and inserted. Thereafter, bonding was performed in the same manner along the shape of the concave portion. Thereafter, an instant adhesive (cyanoacrylate type) and an adhesive amount of 0.08 g were applied to the fitting portion of the inner diameter of the cylindrical body. Then, the temperature 32.5
The instant adhesive was completely cured by being left in an environment of 85 ° C. and a relative humidity of 85% for 48 hours. When the obtained photosensitive drum was evaluated in the same manner as in Example 1, good results were obtained. No effects such as backlash or looseness were observed. No deformation of the end of the photosensitive drum was observed.

Example 3 In Example 1, the aluminum drawing cylinder manufactured by Kobe Steel Co., Ltd. was replaced with an aluminum drawing cylinder manufactured by Noto Steel Co., Ltd. (H63S, inner diameter of fitting portion φ2).
7.08mm, fitting part outer diameter φ28.49mm, length 3m
The material was changed into the annular material of m) and inserted. Thereafter, bonding was performed in the same manner along the shape of the concave portion. Next, it heated to 200 degreeC with the high frequency heating apparatus of FIG. 20 axis center with cylindrical body
It was inserted with a commercially available insertion device adjusted to μm or less. At this time, the high-frequency heating device was not energized. Bonding was held for 4-5 seconds with air cooling. When the obtained photosensitive drum was evaluated in the same manner as in Example 1, good results were obtained. No effects such as backlash or looseness were observed. Also,
The deformation of the end of the photosensitive drum was in the range of 5 mm.

Example 4 The length of the annular material of Example 1 was changed from 2 mm to 3 mm, and the height of the annular material was 0.2 m on the side to be joined at the inner diameter of the cylindrical body.
Example 1 except that a groove having a width of 0.5 mm was provided.
In the same manner as in the above, a photosensitive drum was obtained. When the obtained photosensitive drum was evaluated in the same manner as in Example 1, good results were obtained. No effects such as backlash or looseness were observed. The deformation of the end of the photosensitive drum was in the range of 5 mm.
The bonding strength was 40 kg / cm ² or more.

Example 5 A photosensitive drum was manufactured under the same conditions as in Example 1 except that the amount of penetration of the butting member was 2.0 mm. When the same evaluation was performed, good results were obtained. The range of deformation and the bonding strength were the same as in Example 1.

Comparative Example 1 A drum gear (fitting portion outer diameter: φ28.49 mm) produced by injection molding a polyacetal resin (trade name: “Duramin M90-02”, a copolymer manufactured by Polyplastics Co., Ltd.) Nozzle temperature 200 ° C, cylinder temperature: tip 180 ° C,
170 ° C at the middle, 160 ° C at the rear, injection pressure: 800kg
/ Cm ² , mold temperature: mold 60 ° C., core 60 ° C.), and a drum gear was bonded with an instant adhesive (trade name “Aron Alpha 432FTW”, Toa Gosei Chemical Industry Co., Ltd., adhesive amount 0.08 g), The instant adhesive was completely cured by being left in an environment of a temperature of 32.5 ° C. and a relative humidity of 85% for 48 hours. The obtained photosensitive drum was evaluated in the same manner as in Example 1, and as a result, the gear was disengaged when about 500 sheets were durable. Observation of the bond failure portion at this time revealed that the bond failure occurred at the interface between the drum gear and the adhesive. The breaking torque at this time was 55 kg / cm ² .

[0070]

As described above, the cylindrical member according to the present invention has the following effects.

(1) A material substantially equivalent to that of a cylindrical body is used for the end engaging member whose main part is made of resin, and the material is bent in a state in which it is tightly adhered to the concave part provided in the member whose main part is made of resin. The material that is connected and bent and cut is made of a material that is substantially equivalent to the cylindrical body, so that it is externally affected even in each environment (especially at low temperature, low humidity, or high temperature and high humidity). Therefore, it is possible to always maintain a stable bond.

(2) The bent section is not the cylinder itself,
By bending the annular material, the range of deformation of the cylindrical body is small, and the apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a sectional view of a photosensitive drum according to the present invention.

FIG. 2 is a sectional view of a cylindrical end in a cutting and bending step.

FIG. 3 is a plan view of a cylindrical end in a cutting and bending step.

FIGS. 4A to 4D are cross-sectional views of end engaging members that are engaged with the photosensitive drum according to the present invention, respectively.

FIG. 5 is an explanatory diagram of a dimensional relationship in a step of bending off a cylindrical end.

FIG. 6 is an explanatory diagram of a dimensional relationship of a concave portion of a gear or a flange.

FIG. 7 is a high-frequency heating device used in the present invention.

FIG. 8 is a schematic configuration diagram of an electrophotographic apparatus using a process cartridge having a photosensitive drum according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum gear or drum flange 2 Recess provided in drum gear or drum flange 3 Annular material 4 Abutment member 5 Cylindrical body 6 Photosensitive layer 7 Square hole punch 8 High frequency heating device 9 Coil a Penetration amount b Cylindrical wall thickness c Width of recess d Height of concave part e Tip angle of abutting member f Cut length of cylinder at shearing part g Width of square hole punch h Height of square hole punch

Claims (9)

[Claims] 1. A cylindrical member having an end engaging member having a different thermal expansion coefficient from at least one end of the cylinder, wherein the end engaging member has a thermal expansion coefficient substantially equal to that of the cylindrical body. A cylindrical member which is connected via an annular material. 2. An annular material having substantially the same coefficient of thermal expansion is bent and cut into a concave portion of an end portion of the end engaging member having a different coefficient of thermal expansion. Item 1
4. The cylindrical member according to 1. 3. The cylindrical member according to claim 1, wherein the cylindrical body and the annular material having substantially the same thermal expansion are aluminum, and the end engaging member having a different thermal expansion is a resin. . 4. The cylindrical member according to claim 1, wherein the connection between the cylindrical body and the annular material having substantially the same thermal expansion is press-fitting. 5. The cylindrical member according to claim 1, wherein the connection via the annular material having substantially the same thermal expansion as the cylindrical body is bonding. 6. The cylindrical member according to claim 1, wherein the cylindrical member is connected to the cylindrical member via an annular material having substantially the same thermal expansion by heating or cooling. 7. The method according to claim 4, wherein one or both of the cylindrical body and the annular material having substantially the same thermal expansion are knurled. Cylindrical member. 8. A cylindrical member having an end engaging member at at least one end of a cylinder, wherein the end engaging member is connected via an annular material having a thermal expansion coefficient substantially equal to that of the cylindrical body. A developing sleeve having end engaging members having different thermal expansion coefficients. 9. A cylindrical member having an end engaging member at at least one end of a cylinder, wherein the end engaging member is connected via an annular material having a thermal expansion coefficient substantially equal to that of the cylindrical body. A photosensitive drum having end engaging members having different coefficients of thermal expansion.