JPH07332351A - Supporting structure for rotary body - Google Patents

Abstract

PURPOSE:To prevent the abrasion of a part by suppressing the temperature rise due to the frictional heat between a rotary body and a supporting shaft, concerning a supporting structure for the rotary body such as a gear and a pulley. CONSTITUTION:A supporting shaft 28 is formed to a cylindrical shape, and at one end part, an annular stage part 28a and a small diameter cylindrical part 28b are formed in succession, and an outer peripheral groove 28c is formed on the outer periphery at the other end part. The small diameter cylindrical part 28b is inserted into a through hole 25a of a side plate 25, and the top end is caulked, and the side plate 25 is nipped by the caulked part 28d and an annular ed part 28a, and the supporting shaft 28 is installed on the side plate 25. A gear 30 is formed of the highly slidable resin material, and the supporting shaft 28 is inserted into the center hole 30a, and formed in free slide revolution around the supporting shaft 28, and an E-ring 31 is installed into the outer peripheral groove 28c, and slip-off is prevented. When heat is generated because of friction in the revolution of the gear 30, heat is liberated through the center hole 28e of the supporting shaft 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying machine, printer,
It can be applied to office equipment such as facsimiles and printing machines, or electric appliances for consumer use such as fans and electric washing machines. Specifically, such as office equipment and consumer electric machinery and equipment, such as gears, pulleys, rollers, rollers, sprockets, reels, etc., to transmit driving force, convey and wind articles, The present invention relates to a support structure for a rotating body that releases a wound product. Among such supporting structures for a rotating body, the present invention relates to a supporting structure for supporting a rotating body by allowing a supporting shaft to pass through a center hole of the rotating body and allowing the rotating body to slide and rotate around the supporting shaft.

[0002]

2. Description of the Related Art Conventionally, in a copying machine, for example, in a gear train for transmitting a rotational driving force of a drive motor to a photoconductor, a developing device, etc., a support structure for gears forming the gear train is provided.
For example, there is a configuration shown in FIG. That is, the spindle 1 obtained by cutting and plating a mild steel rod is passed through the through hole 2a of the side plate 2, and one end thereof is caulked to be fixed to the side plate 2. On the other hand, the gear 3 is made of a highly slidable resin material for cost reduction. And the central hole 3 of the gear 3
The support shaft 1 is passed through a, the gear 3 is slidably supported about the support shaft 1 and is rotatable, and the gear 3 is prevented from coming off by an E ring 4.

[0003]

However, such a conventional gear support structure has a problem that frictional heat is generated between the gear 3 and the support shaft 1 when the gear 3 rotates at a high speed and the temperature rises. Then, due to the temperature rise, for example, the resin physical properties of the resin gear 3 are deteriorated, the wear is accelerated, and the life of the resin gear 3 is shortened. Further, due to the temperature rise, for example, the oil viscosity between the metal bearing and the support shaft changes, which accelerates wear and shortens the life of the bearing.

Therefore, an object of the present invention is to prevent wear of parts in a structure for supporting a rotating body such as a gear or a pulley by suppressing a temperature rise due to frictional heat between the rotating body and a spindle. .

[0005]

Therefore, the present invention provides
In a support structure for a rotating body, which supports a rotating body through a support shaft 28 through a center hole 30a of a rotating body such as a gear 30 and slides the rotating body about the support shaft 28, as in the following illustrated embodiment, The support shaft 28 has a cylindrical shape.

According to a second aspect of the present invention, like the embodiment shown in FIG. 4, in the support structure for a rotating body according to the first aspect, a low friction member is provided between the rotating body and the support shaft 28. 33
Is provided.

According to the third aspect of the present invention, FIG. 5 and FIG.
In the support structure for a rotating body according to claim 1, as in the embodiment shown in FIG. 1, when the press-fitting portion 35a to be press-fitted into the central hole 28e of the support shaft 28 and the press-fitting portion 35a are press-fitted to the support shaft 28, It is characterized by being provided with a retaining member 35 having a collar portion 35b for retaining the rotating body.

According to a fourth aspect of the present invention, FIG. 7 and FIG.
In the support structure for a rotating body according to a third aspect of the present invention, the retaining member 35 is made of a material having a high thermal conductivity.

According to a fifth aspect of the invention, like the embodiment shown in FIG. 9, in the support structure for a rotating body according to the first aspect, the central hole 28e of the support shaft 28 projects from the inner surface to radiate heat. The fin 28f is formed.

[0010]

In the present invention, when frictional heat is generated between the rotating body and the support shaft 28 due to the high speed rotation of the rotating body, the heat is radiated through the center hole 28e of the support shaft 28.

In the second aspect, the low friction member 3
3 reduces heat generation due to friction.

According to the third aspect of the present invention, the press-fitting portion 35a is press-fitted into the center hole 28e of the support shaft 28 to attach the retaining member 35 to the support shaft 28, and the flange portion 35b retains the rotating body.

According to the fourth aspect, the heat of the support shaft 28 is transmitted to the retaining member 35, and the flange portion 35b thereof radiates the heat.

According to the fifth aspect, the radiation fin 2 is provided.
Heat is dissipated through 8f to improve the heat dissipation efficiency of frictional heat.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a schematic configuration of an entire laser printer including a rotating body support structure according to a first embodiment of the present invention.

Reference numeral 10 in the figure denotes a printer body. A photoconductor drum 11 is arranged in the printer body 10 substantially at the center. Around the photosensitive drum 11, the charging device 12, the developing device 13, the transfer device 14, and the clear device are arranged in the rotational direction shown by the arrow.
The training device 15 is arranged. Above the charger 12,
The optical writer 16 is arranged. The registration roller pair 17 is arranged on the right side of the transfer device 14, while the registration roller pair 17 is arranged on the left side.
The fixing device 18 is arranged.

Although not shown, the printer body 10 is provided with a drive motor, and the rotational drive force from the drive motor is transmitted through a gear train to the various rollers of the photoconductor drum 11 and the developing device 13 and an agitator. Registration roller pair 1
7, the roller of the fixing device 18, the paper feeding roller 20, and the like.

Therefore, at the time of recording, the sheet S is sent out from the sheet feeding cassette 19 by the rotation of the sheet feeding roller 20, and the sheet S is abutted against the pair of registration rollers 17 and stopped. On the other hand, the surface of the photosensitive drum 11 is charged by the charger 12 while rotating in the clockwise direction in the figure, and the laser is generated by the optical writer 16.
An electrostatic latent image is formed on the surface by irradiating light, and then the electrostatic latent image is visualized when passing through the position of the developing device 13. Then, the sheet S is sent toward the photoconductor drum 11 by the pair of registration rollers 17 in synchronization with the visible image. Then, the visible image on the photosensitive drum 11 is transferred onto the sheet S by the transfer device 14. After the transfer, while cleaning the surface of the photosensitive drum 11 with the cleaning device 15,
The sheet S is sent to the fixing device 18, and the fixing device 18 fixes the image. Then, the sheet is discharged to the sheet stack 22 through the sheet discharge path 21.

By the way, in the first embodiment of the present invention, one of the gears constituting the gear train is supported as shown in FIG. Reference numeral 25 in the figure denotes a side plate that supports the photoconductor 11 and the like. A steel plate is used for the side plate 25, and the through hole 2
5a is provided.

A support shaft 28 is provided through the through hole 25a. The support shaft 28 is made of mild steel or stainless steel in a cylindrical shape, and as shown in FIG. 2, an annular step portion 28a and a small diameter tubular portion 28b are sequentially provided at one end, and an outer peripheral groove 28c is provided at the outer periphery of the other end. Then, as shown in FIG. 1, the through hole 25a is formed.
The distal end is swaged through the small-diameter cylindrical portion 28b, and the swaged portion 28d and the annular step portion 28a sandwich the side plate 25, and the support shaft 28 is attached to the side plate 25 at a right angle to the side plate surface.

A gear 30 is supported by the support shaft 28. The gear 30 is made of a highly slidable resin material. Then, a gear 30 is slidably provided around the support shaft 28 through the support shaft 28 in the center hole 30a, and an E ring 31 is attached to the outer peripheral groove 28c to prevent the gear 30 from coming off. .

Therefore, when the rotational driving force from the drive motor is transmitted, even if friction heat is generated between the drive shaft and the support shaft 28 due to the high speed rotation of the gear 30, the heat is transmitted through the center hole 28e of the support shaft 28.
Radiates heat through. Therefore, the temperature rise can be suppressed, the deterioration of the physical properties of the resin can be prevented, and the life of the resin gear 30 can be extended.

In the first embodiment described above, the gear 30
The support shaft 28 is directly inserted into the center hole 30a of the above.
However, a low friction member may be provided between the support shaft 28 and the gear 30. For example, as in the second embodiment shown in FIG. 3, the low friction member 33 is formed by applying fluorine coating to the inner peripheral surface of a metal cylinder having a short length, and press-fitting it into the center hole 30a of the gear 30. To do. And the low friction member 3
At 3, the heat generation itself due to the friction between the gear 30 and the support shaft 28 is reduced. Thereby, the temperature rise due to frictional heat can be further suppressed.

Further, in the above-described first embodiment, the support shaft 28
The gear 30 was prevented from coming off by the E ring 31 attached to the outer peripheral groove 28c. However, the gear 30 may be retained by a retaining member attached to the central hole 28e of the support shaft 28. For example, as in the third embodiment shown in FIGS. 5 and 6, the retaining member 35 has a press-fitting portion 35a and a collar portion 35b.
6, the press-fitting portion 35a is press-fitted into the center hole 28e of the support shaft 28 from the direction shown by the arrow in FIG. 6 to attach the press-fitting portion 35a to the support shaft 28, and as shown in FIG.
As a result, the outer peripheral groove 28c and the E-ring 31 can be omitted to facilitate manufacture and assembly.

The retaining member 35 described above is formed by pressing using a material having a high thermal conductivity, such as an aluminum alloy plate, and is formed, for example, as in the fourth embodiment shown in FIGS. 7 and 8. The outer diameter of the collar portion 35b may be further increased. When heat is generated by friction due to the rotation of the gear 30, the heat of the support shaft 28 is transferred to the retaining member 35, and the flange portion 35b is used as a heat radiating plate to enhance the heat radiating effect.

Further, the support shaft 28 described above may preferably be constructed so that the heat radiating fins 28f extending from the inner surface toward the center are formed in the center hole 28e, as in the fifth embodiment shown in FIG. And the radiation fin 28f ...
The heat can be radiated through to improve the heat radiation efficiency.

[0027]

Therefore, according to the present invention, when heat is generated by friction due to the rotation of the rotating body, the heat is radiated through the center hole of the support shaft, so that the temperature rise due to friction heat can be suppressed. Therefore, for example, in a bearing using a resin rotating body or a resin coat, it is possible to prevent deterioration of the physical properties of the resin due to temperature rise and prolong the service life thereof.
Further, for example, in the case of a metal bearing impregnated with oil, it is possible to prevent a change in oil viscosity due to a temperature rise and prolong the life thereof.

According to the second aspect, in addition,
Since the low friction member reduces the heat generation itself due to the friction between the rotating body and the support shaft, the temperature rise due to the friction heat can be further suppressed.

According to the third aspect, in addition,
Since the press-fitting part is press-fitted into the center hole of the support shaft and a retaining member is attached to the support shaft, and the rotating body is retained by the flange part, the outer peripheral groove is provided on the support shaft or the outer peripheral groove is You can eliminate the hassle of attaching the E-ring with a special tool.

According to the fourth aspect of the invention, in addition to that, the heat of the support shaft is transmitted to the retaining member and is radiated by the flange portion, so that the heat radiating effect can be enhanced. Then, the temperature rise due to frictional heat can be further suppressed.

According to the fifth aspect, heat is radiated through the radiation fins, so that the heat radiation effect can be enhanced. Then, the temperature rise due to frictional heat can be further suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a gear support structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the support shaft.

FIG. 3 is a schematic configuration diagram of an entire laser printer including the gear support structure.

FIG. 4 is a vertical cross-sectional view showing a gear support structure according to a second embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a gear support structure according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a state in which the retaining member is attached to the support shaft.

FIG. 7 is a longitudinal sectional view showing a gear support structure according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of the retaining member.

FIG. 9 is a sectional view of a support shaft of a gear support structure according to a fifth embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view showing a supporting structure of one gear forming a gear train in a conventional example.

[Explanation of symbols]

 28 spindle 28e central hole 30 gear (rotating body) 30a central hole 35 retaining member 35a press-fitting portion 35b collar portion

Claims (5)

[Claims] 1. A support structure for a rotating body, wherein a supporting shaft is passed through a center hole of the rotating body and is rotatably supported by the rotating shaft about the supporting shaft, the supporting shaft having a cylindrical shape. Support structure. 2. The support structure for a rotating body according to claim 1, wherein a low friction member is provided between the rotating body and the support shaft. 3. A retaining member having a press-fitting portion that is press-fitted into a center hole of the support shaft and a flange portion that prevents the rotor from coming off when the press-fitting portion is press-fitted into the support shaft. Item 2. A rotating body support structure according to Item 1. 4. The support structure for a rotating body according to claim 3, wherein the retaining member is made of a material having a high thermal conductivity. 5. The support structure for a rotating body according to claim 1, wherein a radiating fin is formed so as to project from the inner surface of the center hole of the support shaft.