JP3078464B2 - Flange with internal gear and photoreceptor device provided with the flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange with an internal gear having a disk surface formed at one end in the width direction of the internal gear .
Nji, and fitted e.g. copier photoconductor to the internal gear flanged photosensitive drum, to a photoreceptor device such as a photosensitive member to be subjected to the photoreceptor or other image forming apparatus for printers.

[0002]

2. Description of the Related Art A conventional photoreceptor device is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. 61-155,631. As shown in FIGS. 7 and 8, the photoconductor device includes a plurality of rollers 101 for supporting the photoconductor drum 100 near both ends of the photoconductor drum 100, and is provided on the inner peripheral surface of the photoconductor drum 100. The photosensitive drum 100 is driven by a gear 104 meshing with the internal gear portion 103 of the flange 102 provided.

[0003] For example, see Japanese Patent Application Laid-Open No. 58-120265.
In the publication, as shown in FIG. 9, an internal gear portion 202 of a flange 201 mounted inside a central portion of the entire length of the photosensitive drum 200 and a gear 204 of a motor 203 provided inside the photosensitive drum 200 are shown. Is disclosed.

However, in these photoconductor devices,
There is a disadvantage that one side surface perpendicular to the axis of the photosensitive drum becomes an opening.

[0005] To cope with this drawback, there is a type in which a surface perpendicular to the axis of the photosensitive drum is formed on the closed side of the flange.

In this type of photoreceptor device, for example, FIG.
As shown in FIG. 5, there is a type in which a flange 302 having an internal gear portion 301 is fitted to an end portion of the photoconductor drum 300 and the photoconductor drum 300 is rotated by a driving system including a driving small gear 303. . The flange 302 has an internal gear support 304 formed on a surface perpendicular to the axis of the photosensitive drum 300 to support the internal gear 301, and a rotary bearing formed at the center of the internal gear support 304. A portion 305 is formed.

[0007]

However, in the above-described conventional photoreceptor device having the internal gear support portion 304 formed on a surface perpendicular to the axis of the photoreceptor drum 300, in the cooling process in the manufacture of the flange, the photoreceptor device does not need to be used. As shown in FIG. 5 which is an explanatory view of the present invention, since the toothed portion of the internal gear portion 31, that is, the dimension B is larger than the dimension A, the contraction is delayed at the dimension B portion.

That is, as shown in FIG. 11A, generally, when a thick hanging part 402 is formed at the center of a flat plate 401 by injection molding, the thick hanging part 402 is dried. Because of the delay, as shown in FIG.
02 contracts and curves in the direction of the arrow.

Therefore, in the above-mentioned photoreceptor device, FIG.
As shown in FIG. 2, there is a problem that the free end of the internal gear portion 301 that should be perpendicular to the internal gear support portion 304 bends toward the center of the flange 302. The amount of deflection is up to about 5
It is about 0 to 80 μm.

As a result, the accuracy of the internal gear portion 301 is reduced, and the originally intended meshing error of one pitch of 20 μm is reduced.
m, it is difficult to satisfy the meshing error of 60 μm for all pitches. In particular, in the internal gear portion 301, unlike a general spur gear, if the meshing error exceeds the backlash, interference with the non-driving surface tends to cause a problem.

In order to solve this problem, it is impossible to increase the dimension A shown in FIG. 5 from the viewpoint of improving the accuracy of the gears and the flanges in the circumferential direction and generating shrinkage cavities. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a flexure of an internal gear portion of an internal gear in which a disk surface is formed at one end edge in the width direction of the internal gear portion. It is an object of the present invention to provide an internal gear and a photoreceptor device provided with the internal gear, which can prevent the occurrence of the internal gear as much as possible and can maintain the meshing accuracy of the gears of the internal gear.

[0013]

According to a first aspect of the present invention, there is provided a flange with an internal gear having an internal gear having a disk surface formed at one edge in a width direction of the internal gear . In the flange , in the vicinity of the outer periphery of the disk surface, a reinforcing member for preventing the free end of the internal gear portion from bending in the axial direction protrudes in a cylindrical shape on the opposite side to the direction in which the internal gear portion is formed. The tip is formed to be thinner than the average thickness of the internal gear portion.

According to a second aspect of the present invention, in order to solve the above-mentioned problems, a disk surface is formed at one edge in the width direction of the internal gear portion, and the internal gear is provided near an outer periphery of the disk surface. A reinforcing member for preventing the free end of the free end of the portion from bending in the axial direction is formed by projecting in a cylindrical shape on the side opposite to the forming direction of the internal gear portion, and the protruding tip of the reinforcing member has an average thickness in the internal gear portion. Internal gear with a smaller thickness
The flange is characterized by being fitted to the end of the photosensitive drum.

According to a third aspect of the present invention, there is provided a photoconductor device according to the second aspect, wherein the reinforcing member has a diameter smaller than an outer peripheral surface of the internal gear portion. It is characterized by being formed.

[0016]

According to the first aspect of the present invention, a reinforcing member for preventing the free end of the internal gear portion from bending in the axial direction is provided near the outer periphery of the disk surface of the internal gear portion in the direction in which the internal gear portion is formed. And the tip of the projection is formed to be thinner than the average thickness of the internal gear portion.

Therefore, when the internal gear is hardened, the protruding tip of the reinforcing member formed to be thinner than the average thickness of the internal gear portion is hardened first. Then, by balancing the supporting force of the reinforcing member after hardening and the contraction force on the internal gear portion side with respect to the disk surface, the internal gear portion can be maintained substantially perpendicular to the disk surface.

Further, since the reinforcing member protrudes in a cylindrical shape on the side of the disk surface opposite to the direction in which the internal gear portion is formed, and is formed near the outer periphery, the above-described balancing effect is large.

Therefore, it is possible to minimize the bending of the internal gear portion of the internal gear portion having a disk surface formed at one edge in the width direction of the internal gear portion, and to maintain the meshing accuracy of the gears of the internal gear portion.

According to the structure of the second aspect, the internal gear according to the first aspect is fitted to the end of the photosensitive drum in the photosensitive body device.

For this reason, it is possible to prevent the photosensitive drum from causing rotation unevenness, backlash, lock or an increase in load.

According to the third aspect of the present invention, since the cylindrical reinforcing member is formed to have a smaller diameter than the outer peripheral surface of the internal gear portion, when the internal gear is fitted to the photosensitive drum, the internal gear is engaged. Only the outer peripheral surface of the portion can be brought into contact with the inner peripheral surface of the photosensitive drum.

Therefore, the finishing width of the fitting portion on the inner peripheral surface of the photosensitive drum can be reduced, thereby reducing the number of steps and the cost.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the copying machine 1 provided with the photoreceptor device of the present embodiment has an original mounting table 2 made of hard transparent glass on the upper surface thereof. Has a scanner 3. Further, below the scanner 3, an image forming unit 13 having a photosensitive drum 14 as a center is provided.

The scanner 3 comprises a lamp unit 4, an automatic exposure sensor 5, mirrors 6 to 11, and a lens unit 12. In the scanner 3, a document placed on the document placing table 2 is irradiated with light from a lamp unit 4, and reflected light from the document is exposed on a rotating photosensitive drum 14 by mirrors 6 to 11 and a lens unit 12. Is done.

Around the photosensitive drum 14, the charger 1
5, developing tank 16, pre-transfer charger 17, transfer charger 1
8, peeling charger 19, cleaning unit 20,
A static elimination lamp 21 and a blank lamp (not shown) are provided. The photosensitive drum 14 is uniformly charged by corona discharge from the charger 15 prior to the exposure.

Light is emitted from a blank lamp according to the paper size to clear the electric charge in the non-image area.
The exposure forms an electrostatic latent image.

In the developing tank 16, the toner supplied from the toner hopper 22 and adjusted to a predetermined density by the toner density sensor 23 is stirred by the stirring roller 24 and charged to a predetermined charge amount. Then, the rotation of the photosensitive drum 14 causes the electrostatic latent image to be developed with toner.

The developed toner on the photosensitive drum 14 is
The image is transferred and visualized by a pre-transfer charger 17 and a transfer charger 18 onto a sheet conveyed from a sheet feeding system (not shown). A suction force acts between the sheet after the transfer and the photosensitive drum 14. Then, the peeling charger 19 applies an AC corona to the sheet to change the potential of the sheet to the photosensitive drum 1.
By lowering the suction force to the same potential as the surface of the photosensitive drum 4, the above-mentioned suction force is eliminated, and the paper is peeled off from the surface of the photosensitive drum 14 by its rigidity and by a peeling claw (not shown).

Next, the peeled sheet is sent to the fixing unit 26 via the transport unit 25, and the toner image is fixed and fixed on the sheet.

On the other hand, after the transfer, the toner remaining on the surface of the photosensitive drum 14 is removed by the cleaning unit 2.
The surface of the photosensitive drum 14 that has undergone the transfer process is cleaned by being scraped off and collected. Further, the residual potential of the photoconductor drum 14 is removed by irradiating light from the neutralization lamp 21 to lower the electric resistance of the photoconductor layer.

Each of the means for forming an image includes:
It is controlled by the control unit 27.

At the rear end of the photosensitive drum 14, as shown in FIG. 3, a drum flange with an internal gear as an internal gear (hereinafter simply referred to as "flange") 30.
Are fitted to the photosensitive drum 14 by press-fitting adhesive, and the drive system 40 rotates the photosensitive drum 14 via the flange 30. And
The photoconductor drum 14, the flange 30, and the drive system 40 constitute a photoconductor device.

The drive system 40 includes a drive small gear 41 meshed with the internal gear portion 31 of the flange 30, a drive transmission gear system 42 connected to the drive small gear 41,
And a driving motor 43.

On the other hand, as shown in FIG. 4, the flange 30 has an internal gear portion 31 and a disk surface formed of a surface perpendicular to the axis of the photosensitive drum 14 to support the internal gear portion 31. It has an internal gear support 32 and a rotary bearing 33 formed at the center of the internal gear support 32.

The above-mentioned internal gear portion 31 and rotary bearing portion 33
Are formed to protrude outward in the axial direction from the internal gear support portion 32.

The above-mentioned internal gear portion 31 is formed, for example, with a module of 1 mm, a tooth width of 10 mm, and the number of teeth 73. As shown in FIG. 5, a dimension A = 1.45 mm and a dimension B
= 3.7 mm, dimension C = 2.25 mm and average wall thickness 2 m
m. In general, in the case of a resin gear having a module of 1 mm, which is most frequently used in the field of office equipment and the like, regardless of a spur gear or an internal gear, the dimension A is set to about 75% of the average thickness. The condition is considered to be the most balanced in terms of strength and accuracy, and this embodiment conforms to this condition.

As shown in FIG. 4, a rotary shaft 34 of the photosensitive drum 14 is provided in the rotary bearing 33. The rotating shaft 34 is provided outside the flange 30 in the axial direction, and is fixed to a drum rotating shaft support member 35 fixed to the copying machine main body.

Further, as shown in FIG. 1, the photosensitive drum 1 is mounted on the internal gear supporting portion 32 of the flange 30 of this embodiment.
A reinforcing member 50 for preventing the internal gear portion 31 from bending in the direction toward the axis 4 is formed so as to protrude in the direction opposite to the direction in which the internal gear portion 31 is formed. The reinforcing member 50 extends along the outer peripheral shape of the internal gear portion 31 substantially.
Is formed in a cylindrical shape in the vicinity of.

With the above configuration, it is possible to prevent the free end of the internal gear portion 31, which should be perpendicular to the internal gear support portion 32, from being bent toward the center of the flange 30 in the cooling process of manufacturing the flange 30. it can.

That is, as shown in FIG. 6, in this embodiment, the reinforcing member 50 is attached to the internal gear support portion 32 of the flange 30.
Are integrally formed so as to protrude in a direction opposite to the direction in which the internal gear portion 31 is formed. It is meaningless to form the reinforcing member 50 as a separate body.

By forming the reinforcing member 50,
The outer peripheral portion of the flange 30 has a substantially T-shaped cross section, so that a thick portion P having a poor cooling efficiency is necessarily formed. In this thick portion P, since the cooling is delayed as compared with the other portions, shrinkage cavities are generated as shown by broken lines. At this time, internal stresses F1 and F2 shown in FIG. I do.

Here, on the side of the internal gear portion 31 of the flange 30 where the internal stress F1 is generated, cooling is delayed due to the formation of the thick portion by the internal gear portion 31, and a tensile force is applied in a direction opposite to the internal stress F1.

On the other hand, the flange 3 where the internal stress F2 is generated
On the side opposite to the 0 internal gear portion 31, when there is no reinforcing member 50, there is no equivalent to the formation of the thick internal gear portion 31, so that no force opposing the internal stress F 2 acts.
Therefore, considering the entire system, the contraction force of the internal gear portion 31 remains, and as a result, the internal gear portion 31 bends toward the center of the flange 30.

However, in this embodiment, since the reinforcing member 50 is present and the protruding tip of the reinforcing member 50 is formed thinner than the average thickness of the internal gear portion 31, the reinforcing member 50 The protruding tip hardens first. Then, by balancing the supporting force of the reinforcing member 50 after the hardening and the contraction force of the internal gear portion 31 with respect to the internal gear supporting portion 32, the internal gear portion 31 is substantially perpendicular to the internal gear supporting portion 32. Can be maintained. That is, it is possible to prevent the flange 30 in the internal gear portion 31 from bending toward the center.

As can be understood from the above,
By forming the reinforcing member 50 near the outer periphery of the flange 30, the effect of preventing bending is large. Further, the reinforcing member 50
In order to prevent the cooling from being terminated early and hardening to be delayed, it is preferable that the free end is formed to be thinner and that the leading end portion is smaller than the average thickness of the internal gear portion 31. preferable.

In this embodiment, a step 5 is formed between the outer peripheral surface 30a of the flange 30 and the outer peripheral surface 50a of the reinforcing member 50.
1 are formed. The reason for this is that the outer peripheral surface 30a of the flange 30 serves as a press-fit adhesion margin with the photoreceptor drum 14. Therefore, if the outer peripheral surface 30a and the outer peripheral surface 50a of the reinforcing member 50 coincide with each other on the same plane, the press-fit adhesion margin is reduced. It is because it becomes too large and is not preferable. That is, the photosensitive drum 1
The press-fitting allowance 4 is formed by forming the cylinder of the photosensitive drum 14 and then finishing the inner end of the photosensitive drum 14 for fitting the flange 30. Therefore, if the finishing width, that is, the press-fitting allowance is as short as possible, the processing is easier.

With the photoreceptor device having the above configuration,
When the driving motor 43 is driven, the driving force is transmitted to the internal gear portion 31 of the flange 30 via the driving transmission gear system 42 and the driving small gear 41, whereby
The photoreceptor drum 14 rotates around a rotation shaft 34. At this time, since the internal gear portion 31 is perpendicular to the internal gear support portion 32, the rotation with the driving small gear 41 is smooth.

As described above, the reinforcing member 50 for preventing the free end of the free end of the internal gear portion 31 in the axial direction is provided near the outer periphery of the internal gear support portion 32 of the flange 30 of the present embodiment. The protruding tip is formed thinner than the average thickness of the internal gear portion 31 in a cylindrical shape on the opposite side to the forming direction of the portion 31.

Therefore, when the flange 30 is hardened,
The protruding tip of the reinforcing member 50 formed thinner than the average thickness of the internal gear portion 31 is hardened first. Then, by balancing the support force of the reinforcing member 50 after the hardening and the contraction force of the internal gear portion 31 with respect to the internal gear support portion 32,
The internal gear portion 31 can be maintained substantially perpendicular to the internal gear support portion 32.

The reinforcing member 50 is provided on the internal gear supporting portion 32.
, Is formed in a cylindrical shape on the side opposite to the direction in which the internal gear portion 31 is formed, and is formed in the vicinity of the outer periphery.

Therefore, the flange 3 in which the internal gear supporting portion 32 is formed at one edge of the internal gear portion 31 in the width direction.
The bending of the internal gear portion 31 at zero can be prevented as much as possible, and the meshing accuracy of the gears of the internal gear portion 31 can be maintained.

Further, in the photoconductor device of the present embodiment, the above-mentioned flange 30 is fitted to the end of the photoconductor drum 14.

As a result, the photosensitive drum 14 has uneven rotation,
It is possible to prevent backlash, lock or increase in load.

Further, the cylindrical reinforcing member 50 is provided with the internal gear 3.
1, the outer peripheral surface of the internal gear portion 31 is brought into contact with the inner peripheral surface of the photoconductor drum 14 when the flange 30 is fitted to the photoconductor drum 14. Becomes possible.

Therefore, the finishing width of the fitting portion on the inner peripheral surface of the photosensitive drum 14 can be reduced, thereby reducing the number of steps and the cost.

When the above effect was investigated, when the reinforcing member 50 was not provided, the bending at the tip of the internal gear portion 31 was 50 to 80 μm as described above, When 50 is provided, the internal gear portion 31
Of the tip of the internal gear portion 31
And the driving small gear 41 also had good meshing during rotation.

[0059]

The internal gear according to the first aspect of the present invention.With flange
As mentioned above, near the outer circumference of the disk surface,
To prevent the free end of the section from bending in the axial direction.
The strong member projects cylindrically on the side opposite to the direction in which the internal gear is formed
And the protruding tip is thinner than the average thickness of the internal gear.
It is a configuration that has been formed.

Thus, when the internal gear is hardened, the protruding tip of the reinforcing member formed thinner than the average thickness of the internal gear portion is hardened first. Then, by balancing the supporting force of the reinforcing member after hardening and the contraction force on the internal gear portion side with respect to the disk surface, the internal gear portion can be maintained substantially perpendicular to the disk surface.

Further, since the reinforcing member protrudes in a cylindrical shape on the side of the disk surface opposite to the direction in which the internal gear portion is formed, and is formed near the outer periphery, the above-described balancing effect is large.

Accordingly, it is possible to minimize the bending of the internal gear portion of the internal gear having a disk surface formed at one edge in the width direction of the internal gear portion, and to maintain the meshing accuracy of the gears of the internal gear portion. It works.

In the photoreceptor device according to the second aspect of the present invention, as described above, the disk surface is formed on one edge of the internal gear portion in the width direction, and the free end of the internal gear portion is provided near the outer periphery of the disk surface. A reinforcing member for preventing bending in the axial direction is formed by projecting in a cylindrical shape on the opposite side to the forming direction of the internal gear portion, and a projecting tip of the reinforcing member is formed to be thinner than an average thickness in the internal gear portion. The internal flange with the internal gear is fitted to the end of the photosensitive drum.

As a result, there is an effect that it is possible to prevent the photosensitive drum from causing rotation unevenness, backlash, lock or an increase in load.

As described above, in the photoreceptor device according to the third aspect of the present invention, in the photoreceptor device according to the second aspect, the reinforcing member is formed to have a smaller diameter than the outer peripheral surface of the internal gear portion. Configuration.

Thus, when the internal gear is fitted to the photosensitive drum, only the outer peripheral surface of the internal gear can be brought into contact with the inner peripheral surface of the photosensitive drum.

Therefore, the finishing width of the fitting portion on the inner peripheral surface of the photoreceptor drum can be reduced, whereby the number of steps and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a flange of a photoconductor device according to an embodiment of the present invention.

FIG. 2 is an overall structural view showing a copying machine provided with the photoconductor device.

FIG. 3 is a perspective view showing a drive system of the photoconductor device.

FIG. 4 is a cross-sectional view showing a state where the flange is fitted to a photosensitive drum.

FIG. 5 is an enlarged view of a main part showing a structure of an internal gear portion in the flange in detail.

FIG. 6 is an enlarged sectional view of a main part showing in detail a structure of a reinforcing member in the flange.

FIG. 7 shows a conventional example and is a perspective view of a photoconductor device.

FIG. 8 is a partially cutaway perspective view showing the internal gear portion of the photoconductor device.

FIG. 9 is a perspective view showing another conventional example, in which a photoconductor device is partially cut away.

FIG. 10 is a cross-sectional view of a photoconductor device, showing still another conventional example.

11 (a) and 11 (b) are diagrams for explaining bending due to curing shrinkage when forming a thick hanging portion at the center of the flat plate, and FIG. 11 (a) is a perspective view of a member having a thick hanging portion formed at the center of the flat plate;
(B) is a side view showing the bent state of the member.

FIG. 12 is a cross-sectional view showing a state in which the internal gear portion of the photoconductor device is bent toward the center of the flange.

[Explanation of symbols]

 14 Photoreceptor drum 30 Flange (internal gear) 31 Internal gear 32 Internal gear support (disk surface) 33 Rotation bearing 34 Rotation shaft 50 Reinforcement member 51 Step

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuo Kitabatake 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Hideaki Kadowaki 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Yoshikazu Harada, Inventor 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References Japanese Utility Model Sho-57-49242 (JP, U) (58) Fields investigated (Int.Cl . ^7, DB name) G03G 21/00 350 - 352 G03G 21/16 - 21/18 G03G 15/00 550 F16H 1/00 - 1/26

Claims (3)

(57) [Claims] 1. A flange with an internal gear in which a disk surface is formed at one end edge in the width direction of the internal gear portion, wherein a free end of the free end of the internal gear portion in the axial direction is provided near an outer periphery of the disk surface. a reinforcing member for preventing the internal gear flanged among the forming direction of the gear unit, characterized in that it is thinner than the average wall thickness in the cylindrical shape protrudes and the protruding tip internal gear portion on the opposite side . 2. A disk surface is formed at one edge of the internal gear portion in the width direction, and a reinforcing member for preventing the free end of the internal gear portion from bending in the axial direction is provided near the outer periphery of the disk surface. A flange with an internal gear, which is formed by projecting in a cylindrical shape on the opposite side to the forming direction of the internal gear portion and the projecting tip of the reinforcing member is formed thinner than the average thickness in the internal gear portion,
A photoreceptor device fitted to an end of a photoreceptor drum. 3. The photoconductor device according to claim 2, wherein the reinforcing member has a smaller diameter than an outer peripheral surface of the internal gear portion.