JP2002317825A - Drive transmitting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive transmitting member capable of preventing vibration and noise following rotation and stably transmitting a driving force even in a simple structure. SOLUTION: A damper member 55 made of a flexible and elastic material such as rubber is disposed between an input gear 51 rotated by receiving the driving force from a motor (not shown) or another gear and an output gear 52 that is coaxially disposed facing to the input gear 51 and rotated by receiving the driving force from the input gear 51. On facing surface of the input gear 51 to the damper member 55 of the output gear 52, locking parts 53, 54 formed of shaft-like projections, respectively, are formed integrally with the gears. Engaging holes engaging with the locking parts 53, 54 are formed in both side surfaces of the damper member 55, and are engaged with the locking parts 53, 54 of the input and output gears and the engaging holes formed in the damper member to provide the integrated drive transmitting member 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drive transmitting member for transmitting a driving force of a motor to a driven member by a plurality of gears meshed with each other.

[0002]

2. Description of the Related Art A drive transmission device for transmitting a driving force of a motor to a driven member by a plurality of gears is widely known. Taking an image forming apparatus as an example, a photoreceptor, a developing roller for developing a latent image formed on the photoreceptor, a transfer roller for transferring the image on the photoreceptor to paper, and a fixing for fixing the image transferred to the paper A member such as a roller and a sheet conveying roller receives a driving force of a motor via a plurality of gears.

As described above, in a drive transmission device that transmits the driving force of a motor to a driven member by a plurality of gears, when the load is large, such as rotation against the pressure applied to the driven member, the rotation transmission is smooth. And vibration occurs. In particular, since the driving device is provided in a non-isolated state outside the frame made of sheet metal for the convenience of assembly and maintenance, there is an inconvenient problem that noise generated by vibration cannot be prevented.

[0004]

Therefore, it is necessary to improve the accuracy of the center position and the outer diameter of the rotating shaft of the driven member, and to suppress the generation of vibration by supporting the rotating shaft with a high-precision bearing. However, in this case, there is a problem that the cost is extremely high. Further, when a helical gear is used as the gear for transmitting the drive, generation of abnormal noise can be suppressed. However, in this case, an expensive motor having a large torque is required because the drive transmission efficiency is low. Further, the driving portion of the "printer device" disclosed in Japanese Patent Application Laid-Open No. 7-304233 is characterized in that a grease groove is formed on a shaft on which the gear rotates, and the grease groove forms a gear inner peripheral surface. It is stated that the sliding resistance between the shaft and the outer peripheral surface of the shaft can be reduced to prevent gear meshing noise and rotational unevenness. However, there is a limit in coping with the vibration generated when the load applied to the driven member is large.

In view of the above problems, an object of the present invention is to provide a drive transmitting member which has a simple structure, prevents vibration and noise due to rotation, and can transmit a driving force stably. And

[0006]

According to a first aspect of the present invention, there is provided an input gear that is rotatably driven by receiving a driving force, and is arranged coaxially with the input gear to oppose the input gear. A drive transmission member comprising: an output gear to which a driving force is transmitted from an input gear and driven to rotate; and a damper member formed of a bendable elastic material and disposed between the input gear and the output gear. Forming a shaft-like projection as a locking portion on a surface of the input gear and the output gear facing the damper member, and forming a locking hole in the damper member to be fitted to the projection; The engaging portion and the engaging hole are fitted together to form an integral drive transmission member. The invention according to claim 2 is the drive transmission member according to claim 1, wherein the input gear, the output gear, and the damper member are integrally molded.

According to a third aspect of the present invention, in the drive transmitting member according to the first aspect, a shape of a portion in which the input gear and the damper member are fitted, and a shape in which the output gear and the damper member are fitted with each other have a peak shape. The drive transmission member has an uneven shape formed of a groove, and one of the input gear and the output gear is integrally formed with the damper member.
The invention according to claim 4 is the drive transmission member according to claim 3, wherein the input gear, the damper member, and the output gear are integrally molded.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a configuration of a drive transmission member according to a first embodiment of the present invention. An input gear 51, which is driven to rotate by receiving a driving force from a motor or another gear (not shown), and an output gear 52, which is driven by the driving force from the input gear 51 and is driven to rotate, are opposed to each other on the shaft 50. The input gear 51 and the output gear 52 are made of a resin such as polyacetal in order to reduce noise caused by rotational vibration to a low level. Although the diameters of the input gear 51 and the output gear 52 are the same for the sake of simplicity in the drawings, the invention is not limited to this, and the diameter ratio of the input gear 51 and the output gear 52 may be changed as necessary. be able to. A damper member 55 is provided between the input gear 51 and the output gear 52.
Are arranged. The damper member 55 has a rubber hardness (J
IS-A) is formed of an elastic material which is flexible at about 40 degrees. On the surfaces of the input gear 51 and the output gear 52 facing the damper member 55, locking portions 53 and 54 each formed of an axial projection are formed integrally with the gear. On the other hand, locking holes are formed on both side surfaces of the damper member 55 so as to be fitted to the locking portions 53 and 54. The three members of the input gear 51, the output gear 52, and the damper member 55 molded as described above are fitted along the locking portions 53 and 54 and the locking holes formed in the damper member, and are integrally formed. Drive transmission member 60
And The integrated drive transmission member 60 is inserted into the shaft 50 and is rotatably attached to the shaft with a retaining ring 56. By integrating the three members as described above and attaching them to the shaft, it is possible to reliably transmit the driving force of the input gear 51 to the output gear 52 while having a very simple structure. Further, the load applied to the output gear 52 fluctuates due to the interposition of the damper member 55, and vibration generated due to the fluctuation can be absorbed, and noise can be prevented.

FIG. 2 is a sectional view of a drive transmission member according to a second embodiment. In the first embodiment, the input gear 51, the output gear 52, and the damper member 55 are separately formed, and the three engagement portions provided on the input / output gear and the engagement holes provided on the damper member are fitted. The members were integrated. In the second embodiment, this is performed at the time of molding, and as shown in FIG.
It is characterized in that a damper member 55 is arranged between the output gear 52 and the output gear 52 and molded integrally. By being integrated by molding, the driving force of the input gear 51 is more reliably
Is transmitted to Further, the damper member 55 can absorb the vibration generated due to the fluctuation of the load applied to the output gear 52, and can prevent noise.

FIG. 3 is a sectional view of a drive transmission member according to a third embodiment. An input gear 51 and a damper member 55,
In addition, the shape of the portion where the output gear 52 and the damper member 55 are fitted to each other is an uneven shape composed of peaks and grooves. The configuration is such that either one of the input gear 51 and the output gear 52 is molded integrally with the damper member 55, and the damper member 5
Either one of the gears molded together with 5, and the other gear are fitted along a concave and convex shape composed of a mountain and a groove to be integrated. By making the shape of the fitting portion uneven as described above, the driving force of the input gear 51 can be more reliably increased.
5 from the damper member 55 to the output gear 5
2 is reliably transmitted to the driving force. Also, the damper member 5
By virtue of 5, it is possible to absorb the vibration generated due to the fluctuation of the load applied to the output gear 52 and to prevent noise.

Further, the input gear 51, the output gear 52, and the damper member 55 having the concave and convex shape composed of the peaks and the grooves.
As shown in FIG. 3, a damper member 55 is disposed between the input gear 51 and the output gear 52, and may be integrated at the time of molding. By being integrated by molding, the driving force of the input gear 51 is more reliably
Can be transmitted to

The drive transmission member according to the present invention described above can be used, for example, in a drive portion of an image forming apparatus. FIG. 4 is a vertical sectional front view schematically showing the internal structure of the image forming apparatus. A sheet cassette 3 is detachably mounted on one side of the main body 2 of the image forming apparatus 1, and a paper discharge port 4 is formed on the other side of the main body 2. A photoreceptor 6 is rotatably provided above a paper transport path 5 extending from the paper supply cassette 3 to the paper output port 4. Around the photoreceptor 6, a charger 7 as a process unit and an exposure device 8 are provided. , Developing unit 9
Are arranged. Further, on the outer periphery of the photoconductor 6, a transfer unit 10, a cleaning unit 11, a static eliminator 12, and the like are arranged. Further, from the upstream side to the downstream side along the paper transport path 5, the paper feed roller 13, the registration roller 1
4. A fixing device 17 having a heat roller 15 and a press roller 16 and a paper discharge roller 18 are arranged.

Next, the operation of the image forming apparatus 1 will be described. The surface of the photoreceptor 6 is charged by the charger 7 in the process of being driven to rotate clockwise, and an electrostatic latent image is formed by scanning the charged portion with laser light from the exposing device 8.
The electrostatic latent image is developed by the developing device 9 as a toner image. On the other hand, the paper S in the paper feed cassette 3 is pulled out to the registration roller 14 by the paper supply roller 13, and the paper S is fed to the lower portion of the photoconductor 6 by the registration roller 14 that rotates in synchronization with the rotation of the photoconductor 6. You. The toner image on the photoreceptor 6 is transferred to the sheet S by the transfer unit 10, and the transferred image on the sheet S is fixed when the sheet S passes through the fixing unit 17. The sheet S after the fixing is discharged to the outside by a discharge roller 18.

FIG. 5 is a diagram showing an entire configuration of a drive transmission device that connects between a motor and a driven member of the image forming apparatus 1. The drive transmission device 19 is connected to the main body 2 of the image forming apparatus 1.
And a frame 20 attached to the
A gear train 21, 22, 23, 24 of a plurality of systems driven by a motor (not shown) is mounted on the gear train 0. Gear train 21
Are feed rollers 13, registration rollers 14, and discharge rollers 18 shown in FIG.
A plurality of gears 25, 26 for transmitting the driving force of the motor to
27, 28, 29, 30, 31, 32. The gear train 22 serves as a driven member of the developing device 9 as shown in FIG.
, A plurality of gears 25, 26, 33, 34, 35, 36, 3 for sequentially transmitting the driving force of the motor to the developing roller 9a and the like.
7. The gear train 23 includes a plurality of gears 25, 38, 39, 40, 41, 42, and 4 for sequentially transmitting the driving force of the motor to the photoconductor (driven member) 6 shown in FIG.
3 and 44. The gear train 24 includes a plurality of gears 25 and 38 that sequentially transmit the driving force of the motor to the heat roller 15 shown in FIG.
39, 40, 45, 46, 47, and 48.

Of the above gears, for example, 28 and 29, 3
5 and 36, 45 and 46, coaxially facing each other,
A drive transmission member in which an input gear, an output gear, and a damper member according to the present invention are integrated can be used as a combination of gears for transmitting a driving force. By using the drive transmission member of the present invention, it is possible to transmit the drive force more reliably in a gear train that sequentially transmits the drive force of the motor. Further, since the damper member absorbs the vibration of the gear caused by the load fluctuation of the driven member, it is possible to prevent noise generated due to the vibration.

The above is a description of the case where the drive transmitting member of the present invention is used in an image forming apparatus. However, the use of the drive transmitting member of the present invention is not limited to this, and is mounted on other equipment. The present invention can also be used for a drive transmission device, and can be a drive transmission device that more reliably transmits a driving force by preventing noise due to vibration.

[0017]

As described above, according to the present invention, the input gear, the output gear, and the damper member are arranged, and the damper member is arranged between the input gear and the output gear.
By integrating the engaging portion provided on the input / output gear with the engaging hole provided on the damper member or by molding, the driving force of the input gear can be more reliably transmitted to the output gear, Further, it is possible to provide a drive transmission member capable of preventing generation of noise by absorbing vibration of a gear caused by a load change of a driven member by a damper member. Further, by making the shape of the fitting portion between the input gear and the damper member and the shape of the fitting portion between the output gear and the damper member a concave and convex shape of the ridge and the groove, it is possible to more reliably transmit the driving force.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a drive transmission member according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a drive transmission member according to a second embodiment.

FIG. 3 is a sectional view of a drive transmission member according to a third embodiment.

FIG. 4 is a vertical sectional front view schematically showing an internal structure of the image forming apparatus.

FIG. 5 is a diagram illustrating an entire configuration of a drive transmission device that connects between a motor and a driven member of the image forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Main body 3 Paper feed cassette 4 Paper discharge port 5 Paper conveyance path 6 Photoconductor 7 Charger 8 Exposure device 9 Developing device 9a Developing roller 10 Transfer device 11 Cleaning unit 12 Static eliminator 13 Feed roller 14 Registration roller 15 Heat roller 16 Press roller 17 Fixing device 18 Discharge roller 19 Drive transmission device 20 Frame 21, 22, 23, 24 Gear train 25 to 48 Gear 50 Shaft 51 Input gear 52 Output gear 53, 54 Locking portion 55 Damper member 56 Stop Wheel 60 Drive transmission member

Claims (4)

[Claims] An input gear that is rotatably driven by receiving a driving force; an output gear that is coaxially opposed to the input gear and is rotatably driven by transmitting a driving force from the input gear; A drive transmission member having a damper member disposed between the input gear and the output gear, wherein a locking portion is provided on a surface of the input gear and the output gear facing the damper member. A shaft-shaped projection is formed, and a locking hole to be fitted to the projection is formed in the damper member, and each locking portion and the locking hole are fitted to be integrated with each other. Drive transmission member. 2. The drive transmission member according to claim 1, wherein the input gear, the output gear, and the damper member are integrally formed. 3. The drive transmission member according to claim 1, wherein a shape of a portion where the input gear and the damper member are fitted, and a shape of a portion where the output gear and the damper member are fitted are concave and convex shapes including peaks and grooves. A drive transmission member, wherein one of the input gear and the output gear is formed integrally with the damper member. 4. The drive transmission member according to claim 3, wherein the input gear, the damper member, and the output gear are integrally formed.