WO2018020762A1

WO2018020762A1 - Drive transmission mechanism and image forming device provided with same

Info

Publication number: WO2018020762A1
Application number: PCT/JP2017/016149
Authority: WO
Inventors: 水野　雅彦
Original assignee: 京セラドキュメントソリューションズ株式会社
Priority date: 2016-07-27
Filing date: 2017-04-24
Publication date: 2018-02-01
Also published as: JP6669257B2; JPWO2018020762A1

Abstract

This drive transmission mechanism (30) is provided with: a body frame (101a); a first drive transmission unit (20); and a second drive transmission unit (21). The first drive transmission unit (20) is attachable/detachable to/from the body frame (101a) and has a plurality of first drive transmission gears (23, 24). The second drive transmission unit (21) is attachable/detachable to/from the body frame (101a) and has a plurality of second drive transmission gears (27, 28) that are respectively engaged with the first drive transmission gears (23, 24). The first drive transmission unit (20) becomes, when being moved in a direction orthogonal to the rotary shaft of the first drive transmission gears (23, 24), attachable/detachable to/from the body frame (101a) in a state where the second drive transmission unit (21) is mounted to the body frame (101a). The second drive transmission unit (21) becomes, when being moved in a direction of the rotary shaft of the second drive transmission gears (27, 28), attachable/detachable to/from the body frame (101a) in a state where the first drive transmission unit (20) is mounted to the body frame (101a).

Description

Drive transmission mechanism and image forming apparatus having the same

The present invention relates to a drive transmission mechanism that transmits a driving force to a rotated member mounted on an image forming apparatus such as a digital copying machine or a laser printer, and an image forming apparatus including the drive transmission mechanism.

Conventionally, in an image forming apparatus such as a copying machine, a printer, and a facsimile, a plurality of driving units are arranged on a main body frame to drive a plurality of driven members. At this time, drive transmission may be performed between the drive units.

For example, Patent Document 1 discloses an image carrier driving device having a built-in developing driving train for driving a developing device arranged in the main body of the image forming apparatus. According to the configuration of Patent Document 1, since the image carrier driving device is adjusted in the unit state such as position accuracy, angle accuracy, or phase alignment in the image carrier driving train, adjustment after assembling to the main body frame is performed. Is no longer necessary. Further, the development drive train is arranged by effectively using the space in the unit.

JP 2010-97233 A

By the way, when two drive units in which a plurality of gears that transmit drive to each other mesh with each other are arranged in the main body frame, each drive unit can be attached to and detached from the main body frame depending on the meshing position of the gear of each drive unit. It was sometimes difficult. Therefore, when one drive unit is attached / detached, the other drive unit needs to be attached / detached, and there is a problem that the assemblability and the maintainability deteriorate.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a drive transmission mechanism capable of separately attaching and detaching two drive transmission units that mutually transmit drive through a plurality of drive transmission paths, and an image forming apparatus including the drive transmission mechanism. And

In order to achieve the above object, a first configuration of the present invention is a drive transmission mechanism including a main body frame, a first drive transmission unit, and a second drive transmission unit. The first drive transmission unit is detachable from the main body frame and has a plurality of first drive transmission gears. The second drive transmission unit is detachable from the main body frame, and has a plurality of second drive transmission gears that mesh with each of the first drive transmission gears. The first drive transmission unit can be attached to and detached from the main body frame in a state where the second drive transmission unit is attached to the main body frame by moving in the direction orthogonal to the rotation axis of the first drive transmission gear. The second drive transmission unit can be attached to and detached from the main body frame in a state where the first drive transmission unit is attached to the main body frame by moving in the direction of the rotation axis of the second drive transmission gear.

According to the first configuration of the present invention, the first drive transmission unit and the second drive transmission unit in which a plurality of drive transmission gears mesh with each other can be independently attached to and detached from the main body frame. Therefore, the drive transmission mechanism is excellent in assembling workability and maintainability.

1 is a schematic configuration diagram of a color printer 100 including a first drive transmission unit 20 and a second drive transmission unit 21 constituting a drive transmission mechanism 30 of the present invention. The perspective view which shows the state with which the 1st drive transmission unit 20 and the 2nd drive transmission unit 21 were mounted | worn with the side surface frame 101a. The perspective view which looked at the 1st drive transmission unit 20 from the front side. The perspective view which looked at the 2nd drive transmission unit 21 from the front side. The partial perspective view which looked at the 2nd drive transmission unit 21 with which side frame 101a was equipped from the back side. The top view which shows mesh | engagement of the 1st drive input gear 23 of the 1st drive transmission unit 20, the 2nd drive input gear 24, the 1st drive output gear 27 of the 2nd drive transmission unit 21, and the 2nd drive output gear 28 Side sectional view showing meshing of the first drive input gear 23 of the first drive transmission unit 20 and the first drive output gear 27 of the second drive transmission unit 21 Side sectional view showing meshing of the second drive input gear 24 of the first drive transmission unit 20 and the second drive output gear 28 of the second drive transmission unit 21 The perspective view which shows the state which removed the 1st drive transmission unit 20 from the side surface frame 101a. The side view which shows the state which removed the 1st drive transmission unit 20 from the side surface frame 101a. The perspective view which shows the state which removed the 2nd drive transmission unit 21 from the side surface frame 101a. The side view which shows the state which removed the 2nd drive transmission unit 21 from the side surface frame 101a.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an internal configuration of a color printer 100 including a first drive transmission unit 20 and a second drive transmission unit 21 constituting a drive transmission mechanism 30 of the present invention. In the main body of the color printer 100, four image forming portions Pa, Pb, Pc, and Pd are sequentially arranged from the upstream side in the transport direction (the right side in FIG. 1). These image forming portions Pa to Pd are provided corresponding to images of four different colors (cyan, magenta, yellow, and black), and cyan, magenta, and yellow are respectively performed by charging, exposure, development, and transfer processes. And a black image are sequentially formed.

These image forming portions Pa to Pd are provided with

photosensitive drums

1a, 1b, 1c and 1d for carrying visible images (toner images) of the respective colors, respectively, and further in the counterclockwise direction in FIG. An intermediate transfer belt 8 that rotates in the vicinity of each other is provided adjacent to each of the image forming portions Pa to Pd.

When image data is input from a host device such as a personal computer, first, the surfaces of the photosensitive drums 1a to 1d are uniformly charged by the charging devices 2a to 2d. Next, light is irradiated according to the image data by the exposure device 5, and electrostatic latent images corresponding to the image data are formed on the respective photosensitive drums 1a to 1d. The developing devices 3a to 3d are filled with a predetermined amount of a two-component developer (hereinafter, also simply referred to as a developer) containing toners of cyan, magenta, yellow, and black by toner containers 4a to 4d. The toner in the developer is supplied onto the photosensitive drums 1a to 1d by 3a to 3d and electrostatically adheres. Thereby, a toner image corresponding to the electrostatic latent image formed by exposure from the exposure device 5 is formed.

Then, a predetermined transfer is performed between the primary transfer rollers 6a to 6d and the photosensitive drums 1a to 1d by the primary transfer rollers 6a to 6d while rotating the intermediate transfer belt 8 wound around the tension roller 10 and the driving roller 11. An electric field is applied by voltage, and cyan, magenta, yellow, and black toner images on the photosensitive drums 1 a to 1 d are primarily transferred onto the intermediate transfer belt 8. Toner remaining on the surfaces of the photosensitive drums 1a to 1d after the primary transfer is removed by the cleaning devices 7a to 7d.

The paper P to which the toner image is transferred is accommodated in a paper cassette 16 disposed in the lower part of the color printer 100, and the paper P is intermediated at a predetermined timing via the paper feed roller 12a and the registration roller pair 12b. The toner is conveyed to a nip portion (secondary transfer nip portion) between the secondary transfer roller 9 provided adjacent to the transfer belt 8 and the intermediate transfer belt 8. The sheet P on which the toner image is secondarily transferred is conveyed to the fixing device 13.

The paper P conveyed to the fixing device 13 is heated and pressed by the fixing roller pair 13a to fix the toner image on the surface of the paper P, and a predetermined full color image is formed. The paper P on which the full-color image has been formed passes through the paper conveyance path 18 and is transferred to the discharge tray 17 by the discharge roller pair 15 as it is (or after being distributed to the reverse conveyance path 19 by the branching section 14 and images are formed on both sides). Discharged.

FIG. 2 is a perspective view showing a state where the first drive transmission unit 20 and the second drive transmission unit 21 are mounted on the side frame 101a of the color printer 100. FIG.

Side frames

101 a and 101 b made of sheet metal are arranged inside the side surface of the color printer 100. One (front side in FIG. 2) side frame 101a is equipped with a first drive transmission unit 20 and a second drive transmission unit 21 that transmit driving force to the fixing device 13, the discharge roller pair 15 (see FIG. 1), and the like. Has been. The first drive transmission unit 20 and the second drive transmission unit 21 constitute the drive transmission mechanism 30 of the present invention.

FIG. 3 is a perspective view of the first drive transmission unit 20 as viewed from the front side (front side in FIG. 2). The first drive transmission unit 20 has a first drive input gear 23 and a second drive input gear 24 mounted on the front side of the first unit housing 20a. The first drive input gear 23 and the second drive input gear 24 are spur gears. A plurality of screw holes 25 for fixing screws to the side frame 101a are formed in the first unit housing 20a.

4 is a perspective view of the second drive transmission unit 21 as viewed from the front side (front side of FIG. 2), and FIG. 5 is a view of the second drive transmission unit 21 attached to the side frame 101a as viewed from the back side. FIG. The second drive transmission unit 21 has a first drive output gear 27 and a second drive output gear 28 mounted on the back side of the second unit housing 21a. The first drive output gear 27 and the second drive output gear 28 are spur gears, and the second drive output gear 28 is a two-stage gear having a large diameter portion 28a and a small diameter portion 28b.

Clutchs

29a and 29b are mounted on the front side of the second unit casing 21a. The second unit housing 21a has a plurality of screw holes (not shown) for fixing screws to the side frame 101a.

FIG. 6 is a front view showing meshing of the first drive input gear 23 and the second drive input gear 24 of the first drive transmission unit 20 with the first drive output gear 27 and the second drive output gear 28 of the second drive transmission unit 21. FIG. 7 is a side cross-sectional view (cross-sectional view taken along the line AA in FIG. 6) showing the meshing between the first drive input gear 23 and the first drive output gear 27, and FIG. 8 shows the second drive input gear 24 and the second drive input gear 24. FIG. 7 is a side cross-sectional view (cross-sectional view taken along the line BB in FIG. 6) showing the engagement of the drive output gear 28.

With the first drive transmission unit 20 and the second drive transmission unit 21 mounted on the side frame 101a, as shown in FIGS. 6 and 7, the first drive input gear 23, the first drive output gear 27, Mesh in the vertical direction. Further, as shown in FIGS. 6 and 8, the second drive input gear 24 and the small diameter portion 28b of the second drive output gear 28 mesh in the vertical direction.

As a result, a driving force from a motor (not shown) is transmitted to the first drive input gear 23 via the first drive output gear 27 and transmitted to the second drive input gear 24 via the second drive output gear 28. Is done. The drive train including the first drive output gear 27 and the first drive input gear 23 transmits the rotational drive force to the discharge roller pair 15 (see FIG. 1). The drive train including the second drive output gear 28 and the second drive input gear 24 releases the pressure of the fixing roller pair 13a (see FIG. 1) of the fixing device 13.

The

clutches

29a and 29b (see FIG. 4) are drivingly connected to the motor, and the first drive output gear 27 and the second drive output gear 28 are the first drive input gears only when the

clutches

29a and 29b are energized. The driving force is transmitted to the second driving input gear 24 and the second driving input gear 24.

Next, a procedure for attaching and detaching the first drive transmission unit 20 and the second drive transmission unit 21 to the side frame 101a will be described. 9 and 10 are a perspective view and a side view, respectively, showing a state in which the first drive transmission unit 20 is removed from the side frame 101a.

When removing only the first drive transmission unit 20 from the side frame 101a, first, the screw fastened to the screw hole 25 of the first unit housing 20a is loosened and removed. Next, a meshing portion M1 between the first drive input gear 23 and the first drive output gear 27 and a meshing portion M2 between the second drive input gear 24 and the second drive output gear 28 (see FIGS. 7 and 8). The first drive transmission unit 20 is pulled out in the direction of separation (the direction of arrow C in FIG. 10).

When the first drive transmission unit 20 is attached to the side frame 101a to which the second drive transmission unit 21 is attached, the first drive input gear 23, the first drive output gear 27, the second drive input gear 24, The first drive transmission unit 20 is inserted in the direction in which the first drive output gear 28 meshes (the direction of the arrow C ′ in FIG. 10). Then, the screw holes 25 and screw holes (not shown) of the side frame 101a are fastened with screws to fix the first unit housing 20a to the side frame 101a.

11 and 12 are a perspective view and a side view, respectively, showing a state in which the second drive transmission unit 21 is removed from the side frame 101a.

When removing only the second drive transmission unit 21 from the side frame 101a, first, a screw fastened to a screw hole (not shown) of the second unit casing 21a is loosened and removed. Next, the second drive transmission unit 21 is pulled out in the direction of the rotation axis of the first drive output gear 27 and the second drive output gear 28 (the direction of arrow D in FIG. 12). Thereby, the meshing portion M1 between the first drive input gear 23 and the first drive output gear 27 and the meshing portion M2 between the second drive input gear 24 and the second drive output gear 28 (see FIGS. 7 and 8). It slides away in the groove direction of the gear teeth.

At this time, since the large-diameter portion 28a of the second drive output gear 28 is positioned downstream of the second drive input gear 24 with respect to the pull-out direction (arrow D direction), the second drive transmission unit 21 is pulled out when the second drive transmission unit 21 is pulled out. There is no possibility that the large-diameter portion 28a of the two-drive output gear 28 interferes with the second drive input gear 24.

When the second drive transmission unit 21 is attached to the side frame 101a to which the first drive transmission unit 20 is attached, the rotational axis directions of the first drive output gear 27 and the second drive output gear 28 (arrows in FIG. 12). The second drive transmission unit 21 is inserted in the direction D ′). Then, the second unit casing 21a is screwed to the side frame 101a.

According to the configuration of the present embodiment, the first drive input gear 23 and the first drive output gear 27, and the second drive input gear 24 and the second drive output gear 28 are engaged with each other from substantially the same direction (vertical direction). By moving the first drive transmission unit 20 in the direction orthogonal to the rotation axes of the first drive input gear 23 and the second drive input gear 24 (in the direction of the arrow CC ′ in FIG. 10), only the first drive transmission unit 20 is moved. It becomes possible to attach and detach smoothly.

Further, by moving the second drive transmission unit 21 in the direction of the rotation axis of the first drive output gear 27 and the second drive output gear 28 (in the direction of the arrow DD ′ in FIG. 12), only the second drive transmission unit 21 is smoothly moved. It becomes detachable. Therefore, the first drive transmission unit 20 and the second drive transmission unit 21 can be independently attached to and detached from the side frame 101a, and the drive transmission mechanism 30 is excellent in assembling workability and maintainability.

The second drive output gear 28 of the second drive transmission unit 21 is a two-stage gear, and the second drive input gear 24 of the first drive transmission unit 20 is engaged with the small diameter portion 28b, and the large diameter portion 28a is the second gear. 2 The drive transmission unit 21 is disposed downstream in the pulling direction (upstream in the mounting direction). Thereby, it is possible to avoid interference between the second drive input gear 24 and the second drive output gear 28 when the second drive transmission unit 21 is pulled out and attached.

In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the drive transmission mechanism 30 shown in FIGS. 2 to 12 is an example, and the number and arrangement of the gears constituting the first drive transmission unit 20 or the second drive transmission unit 21 can be selected as appropriate.

For example, in the above embodiment, the first drive transmission unit 20 includes the two drive input gears 23 and 24, the second drive transmission unit 21 includes the two drive output gears 27 and 28, and transmits the drive by two different drive trains. Although the drive transmission mechanism 30 that performs the above has been described, a configuration in which three or more drive input gears and three drive output gears are provided may be employed. Further, the driving force may be transmitted from the first drive transmission unit 20 to the second drive transmission unit 21.

Moreover, in the said embodiment, although the 2nd drive output gear 28 of the 2nd drive transmission unit 21 was made into the two step gear which has the large diameter part 28a and the small diameter part 28b, not only a two step gear but the large diameter part 28a, A multi-stage gear including the small diameter portion 28b may be used.

In the above embodiment, the first drive output gear 27 and the second drive output gear 28 are spur gears. However, the first drive output gear 27 and the second drive output gear 28 are helical gears. There may be. In the helical gear, the groove direction of the gear teeth is not parallel to the rotation axis but has a predetermined angle. For this reason, when the second drive transmission unit 21 is pulled out and mounted, if the second drive output gear 28 is moved in the direction of the rotation axis, a load in the rotation direction is applied to the helical gear. However, since the rotational load of the gear is reduced in the unit state as in the above embodiment, the first drive output gear is moved when the second drive transmission unit 21 is moved in the direction of the rotation axis of the second drive output gear 28. 27, the second drive output gear 28 rotates by a predetermined angle in the direction of releasing the load, and the second drive transmission unit 21 can be smoothly attached and detached.

The present invention is not limited to the tandem color printer 100 as shown in FIG. 1, but can be used for various image forming apparatuses such as monochrome and digital multifunction machines, monochrome printers, and facsimiles.

The present invention can be used for a drive transmission mechanism that transmits a driving force. By utilizing the present invention, two drive transmission units that mutually transmit drive through a plurality of drive transmission paths can be attached to and detached from the main body frame independently, so that drive transmission with excellent assembly workability and maintainability is achieved. A mechanism can be provided.

Claims

Body frame,
A first drive transmission unit that is detachable from the main body frame and has a plurality of first drive transmission gears;
A second drive transmission unit that is detachable from the main body frame and has a plurality of second drive transmission gears that mesh with each of the first drive transmission gears;
With
The first drive transmission unit can be attached to and detached from the main body frame in a state where the second drive transmission unit is attached to the main body frame by moving in the direction orthogonal to the rotation axis of the first drive transmission gear. And
The second drive transmission unit can be attached to and detached from the main body frame in a state where the first drive transmission unit is mounted on the main body frame by moving in the direction of the rotation axis of the second drive transmission gear. A drive transmission mechanism characterized by this.
At least one of the second drive transmission gears is a multi-stage gear including a small diameter portion with which the first drive transmission gear meshes, and one or more large diameter portions integrally formed adjacent to the small diameter portion. ,
When separating the second drive transmission unit from the main body frame, the large diameter portion is located downstream in the moving direction of the second drive transmission unit, and when the second drive transmission unit is mounted on the main body frame 2. The drive transmission mechanism according to claim 1, wherein the large-diameter portion is located upstream in the moving direction of the second drive transmission unit.
The drive transmission mechanism according to claim 1, wherein the first drive transmission gears mesh with the corresponding second drive transmission gears from substantially the same direction.
The drive transmission mechanism according to claim 1, wherein the first drive transmission gear and the second drive transmission gear are spur gears.
An image forming apparatus comprising the drive transmission mechanism according to claim 1.