JP2000075582A - Drive transmission device, developing device, and image forming device provided with them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive transmission device capable of maintaining gear engagement and transmitting drive without causing any cost increase caused by component accuracy and degrading assemblage due to an assembling order and an adjustment process. SOLUTION: In this drive transmission device, a rotary driving force from a pressure drive unit 50 is transmitted to a pressure unit 110 by the engagement of gears 53Y, 53M, 53C and 53K and gears 54Y, 54M, 54C and 54K, and is outputted. In this case, the gears 53Y, 53M, 53C and 53K and the gears 54Y, 54M, 54C and 54K use high-tooth gears so as to enlarge the distance between the rotary shaft of the pressure drive unit 50 and the rotary shaft of the pressure unit 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmitting device, a developing device, and an image forming storage provided with the same.

[0002]

2. Description of the Related Art Conventionally, in such a drive transmission device,
As shown in FIG. 11A, a drive transmission device for transmitting drive between two integrally configured units by using a plurality of gears is known and is in practical use.

As shown in FIG. 11A, such a drive transmission device has a drive unit 700 as a drive unit and a driven unit 800 as an output unit. The drive unit 700 and the driven unit 800 are connected to a main body side plate 901. And is fixed by screws (not shown).

The driving unit 700 has driving motors 702a and 702b disposed on a driving unit side plate 701,
Output two-stage gears 704a and 704b as first gears are arranged so as to mesh with motor gears 703a and 703b provided on the rotation shafts of the drive motors 702a and 702b.

The output two-stage gears 704a and 704b are rotatably supported by shafts 705a and 705b on the drive unit side plate 701.

On the other hand, in the driven unit 800, output shafts 802a and 802b are rotatably supported by a driven unit side plate 801 via bearings, and an input gear serving as a second gear is fixed to an axial end of the output shafts 802a and 802b. Have been.

[0007] Such a drive transmission device includes a drive unit 70
0 and the driven unit 800 are fixed to the main body side plate 901, and the output two-stage gears 704a, 704b mesh with the input gears 803a, 803b, so that the rotational driving force of the drive motors 702a, 702b is output shaft 802.
a, 802b.

Thus, the output two-stage gears 704a, 704a
4b and the input gears 803a, 803b
Output two-stage gears 704a, 704b and input gear 803a,
The distance between the shaft and the 803b is 1 for the gear module (m).
In the case of, accuracy of about ± 0.1 mm is usually required.

[0009]

However, in such a drive transmission device, the input gears 803a, 803b
And the output gears 704a and 704b are positioned and engaged with each other from different units, so that it is difficult to satisfy the above accuracy.

The positions of the output two-stage gears 704a and 704b are determined by the main body reference pins 902, and the distances from the reference holes 701a formed in the drive unit side plate 701 to the shafts 705a and 705b are distances A and B, respectively. On the other hand, the positions of the input gears 803a and 803b are positioned by the main body reference pins 903, and are shifted from the reference holes 801a of the driven unit side plate 801 to the bearing holes 801.
The distances to c and 801d are distances C and D, respectively.

Since the distances A, B, C, and D have variations, the required variation of the center distance ±
In order to satisfy 0.1 mm (m = 1), it is necessary that the sum of A / B variation and C / D variation be within ± 0.1.

That is, in order to reduce the variation in A / B and C / D, it is necessary to improve the precision of parts.
There is a problem that the cost of parts increases. In particular, the accuracy (B, D) of the position apart from the reference holes 701a, 801a
It is very difficult and leads to large cost increase.

On the other hand, if the distance between the shafts cannot be satisfied, the backlash of the gear is eliminated, the meshing is increased, the backlash becomes excessive, the transmission rotational driving force is reduced, the wear is early, the gear is damaged, and the like. May occur.

Therefore, as shown in FIG. 11B, the drive unit 700 and the driven unit 800 are directly positioned, and the driven unit 800 is connected to the main body side plate 901.
After the positioning is fixed by the reference pin 903, the drive unit positioning holes 811a and 811 of the driven unit side plate 801 are formed.
There is a configuration in which the shafts 705a and 705b of the drive unit 700 are made longer and fitted to perform positioning. Thereby, the bearing holes 801c and 801d and the positioning holes 81
If only the accuracy of 1a and 811b is improved, the variation in the distance between the axes can be satisfied, so that the cost of parts does not increase.

However, in such a configuration, if the driven unit 800 is not attached, the driving unit 900
Because it cannot be positioned and cannot be mounted.
The order of assembly is required, resulting in deterioration of assemblability.

Further, as shown in FIG. 11C, motors 702a and 702b, shafts 705a and 705b, gear 70
3a, 703b and output two-stage gears 704a, 704b are integrated on the sub side plates 706a, 706b to form the drive side plate 70.
1 in the direction of the arrow to adjust the input gear 803a,
There is a configuration in which the center distance between the 803b and the output two-stage gears 704a, 704b is adjusted. However, an adjustment step is required, the assemblability is reduced, the number of parts is increased, and the cost is increased.

Accordingly, the present invention provides a drive transmitting device, a developing device, and an image forming apparatus including the same, which can maintain the meshing of the gears and transmit the drive without increasing the cost due to the accuracy of parts and reducing the assemblability due to the assembling sequence and the adjustment process. The purpose is to provide the device.

[0018]

According to the present application, the object is to transmit a rotational driving force from a driving unit to an output unit by meshing a first gear and a second gear to output the rotational driving force. A drive transmission device, wherein the drive unit has a first gear that rotates by the rotational driving force of the drive unit, and the output unit has a second gear that meshes with the first gear and transmits the rotational drive force. In the transmission device, the first gear and the second gear increase the distance between the rotation shaft of the driving unit and the rotation shaft of the output unit,
This is achieved by the first invention in which the gear is a high tooth gear.

Further, according to the present application, the above object is also achieved by the second invention in which the drive unit is a drive unit integrally having a plurality of gears in the first invention. .

Further, according to the present application, the above object is achieved according to the first invention or the second invention, in which the output unit is a driven unit having a plurality of gears and integrally formed. Is also achieved by

According to the present application, the above object is a developing device which develops the latent image opposite to a latent image carrier for carrying a latent image, comprising the drive transmission device of the first invention, The present invention is also achieved by the fourth invention in which separation from the latent image carrier and pressurization are possible.

Further, according to the present application, the above object is also attained by the fifth invention in the fourth invention, wherein the driving section is a driving unit having a plurality of gears and integrally formed. .

Further, according to the present application, the above object is the sixth invention in which the output unit is a driven unit integrally having a plurality of gears in the fourth invention or the fifth invention. Is also achieved by

Further, according to the present application, an object of the present invention is an image forming apparatus for recording an image formed by a series of image forming processes on a recording medium, wherein the drive transmission device according to the first invention, The present invention is also achieved by the seventh invention including the developing device of the fourth invention.

According to the present application, the above object is also attained by the eighth invention in which, in the seventh invention, the drive section is a drive unit integrally having a plurality of gears. .

Further, according to the present application, the above object is attained in the ninth invention according to the seventh invention or the eighth invention, wherein the output section is a driven unit integrally formed with a plurality of gears. Is also achieved by

That is, in the first invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the rotational driving force from the drive unit is reduced. Transmit to output section.

Further, in the second invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the rotational driving force from the drive unit is reduced. Transmit to output section.

Further, in the third invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the rotational driving force from the drive unit is reduced. Transmit to output section.

In the fourth invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the rotational driving force from the drive unit is reduced. The image is transmitted to the output unit, and the developing device is separated from the latent image carrier and pressurized.

Furthermore, in the fifth invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, thereby reducing the rotational driving force from the drive unit. The image is transmitted to the output unit, and the developing device is separated from the latent image carrier and pressurized.

In the sixth invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, thereby reducing the rotational driving force from the drive unit. The image is transmitted to the output unit, and the developing device is separated from the latent image carrier and pressurized.

Further, in the seventh invention according to the present application, the first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, to thereby reduce the rotational driving force from the drive unit. Transmit to output section.

In the eighth invention according to the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the rotational driving force from the drive unit is reduced. Transmit to output section.

Further, according to the ninth invention of the present application, the first gear, which is a high gear, meshes with the second gear, which is a high gear, thereby reducing the rotational driving force from the drive unit. Transmit to output section.

[0036]

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

In this embodiment, an example in which a drive transmission device is applied to a developing device provided in a color image forming apparatus will be described.

FIG. 1 is a schematic cross-sectional view of a color image forming apparatus as an example of an image forming apparatus according to the present embodiment. The color image forming apparatus has a digital color image reader section at the top and a digital color image printer at the bottom. Part.

In the digital color image reader, the original 30 is placed on an original platen glass 31, and the original 30 is exposed and scanned by an exposure lamp 32. To obtain a color separation image signal. The color-separated image signal is processed by a video processing unit (not shown) through an amplifier circuit (not shown), and then sent to the digital color image printer.

In the digital color image printer section, a photosensitive drum 1 as a latent image carrier is rotatably supported in the direction of the arrow shown in the figure, and an exposure lamp 11, a corona charger 2, a laser exposure Optical system 3, potential sensor 12, developing device 4 as four developing devices of different colors
Y, 4C, 4M, 4BK, on-drum light amount detecting means 13,
A transfer device 5 and a cleaning device 6 are provided.

In the laser exposure optical system 3, an image signal from the reader section is converted into an optical signal by a laser output section (not shown), and the converted laser light is converted into a polygon mirror 3a.
And is irradiated on the surface of the photosensitive drum 1 through the lens 3b and the mirror 3c.

At the time of image formation in the printer section, the photosensitive drum 1
Is rotated in the direction of the arrow shown in the figure, and the photosensitive drum 1 after being neutralized by the exposure lamp 11 is uniformly charged by the corona charger 2, and the photosensitive drum 1 is irradiated with the light image E for each separation color. 1 to form a latent image.

Next, desired developing units (4Y, 4C, 4M,
4BK) to develop the latent image on the photosensitive drum 1,
A toner image based on a resin is formed on the photosensitive drum 1. The developing units 4Y, 4C, 4M, and 4BK are configured to selectively approach the photosensitive drum 1 in accordance with each separated color by the operation of the eccentric cams 24Y, 24C, 24M, and 24BK.

On the other hand, a recording material as a recording medium accommodated in the recording material cassette 7 is supplied to a position facing the photosensitive drum 1 via a transport system and a transfer device 5, and the recording material on the photosensitive drum 1 The toner image is transferred. In the present embodiment, the transfer device 5 includes a transfer drum 5a, a transfer charger 5
b, an adsorption charger 5c for electrostatically adsorbing the recording material, an adsorption roller 5g opposed to the adsorption charger 5c, and an inner charger 5
d and an outer charger 5e, and a recording material carrying sheet 5f made of a dielectric material is integrally stretched into a cylindrical shape in a peripheral opening area of the transfer drum 5a which is rotatably supported and rotatably driven. I have. Note that a dielectric sheet such as a polycarbonate film is used as the recording material supporting sheet 5f.

As the transfer drum 5a rotates, the toner image on the photosensitive drum 1 is transferred to the transfer charger 5b.
Is transferred onto the recording material carried on the recording material carrying sheet 5f.

In this manner, a desired number of color images are transferred to the recording material sucked and conveyed to the recording material carrying sheet 5f, and a full-color image is formed.

In the case of full-color image formation, when the transfer of the four-color toner image to the recording material is completed as described above,
Separation claw 8a, separation push-up roller 8b and separation charger 5h
The recording material is separated from the transfer drum 5a by the action of, and the recording material is sent to the heat roller fixing device 9 to fix the toner image on the recording material, and the recording material on which the toner image is fixed is placed on the tray 10 outside the machine. Is discharged.

When the transfer is completed, the photosensitive drum 1
The residual toner on the surface is cleaned by the cleaning device 6 and is again provided for image formation.

When an image is formed on both sides of a recording material, the recording material exits the heat roller fixing device 9 and immediately drives the conveyance path switching guide 19 to convey the recording material through the vertical conveyance path 20. After the recording material is once guided to the reversing path 21a, the reversing roller 21b reversely retracts the recording material so that the recording material is retracted in a direction opposite to the direction in which the recording material is fed, with the trailing end leading, and is stored in the intermediate tray 22. Thereafter, an image is formed on the other surface of the recording material again by the image forming step.

The recording material supporting sheet 5 of the transfer drum 5a
f and the recording material supporting sheet 5 in order to prevent scattering of powder on f, adhesion of oil on the recording material, and the like.
The cleaning is performed by using a backup brush 15 facing the fur brush 14 via f and a backup brush 17 facing the roller 16 via the oil removing roller 16 and the recording material carrying sheet 5f. Such cleaning is performed before or after image formation, and is performed as needed when a jam (paper jam) occurs.

Further, in the present embodiment, the gap between the transfer drum 5a and the photosensitive drum 1 is reduced by driving the eccentric cam 25 at a desired timing and driving the cam follower 5i integrated with the transfer drum 5f. The configuration can be set arbitrarily. For example, during standby or power supply OF
At the time of F, the interval between the transfer drum 5a and the photosensitive drum 1 is increased.

Next, referring to FIG. 2 to FIG.
The pressurizing operation of 4C, 4M, 4BK will be described in detail. FIG. 2 is a main cross-sectional view showing a pressure mechanism around the developing device,
FIG. 3 is a development cross-sectional view of a driving system of a developing unit pressurizing unit as a driving unit which is a driving unit having a plurality of gears and a developing unit pressurizing driving unit which is a driven unit having a plurality of gears. FIG.

FIG. 2 shows a pressing mechanism of the yellow developing unit 4Y as an example, but developing units 4C, 4M and 4BK of other colors are used.
Are similarly configured.

The yellow developing device 4Y includes a developing sleeve 40.
1, a screw 403, 404, a blade 405, and the like.
1Y is inserted from the near side and fixed with screws from the near side.

As shown in FIG. 3, the pressure rail 101Y engages slide pins 103Y protruding from the front and rear thereof with slide holes 91a and 92a formed in the front and rear side plates 91 and 92 of the pressure unit. It is slidably supported by.

A pressure leaf spring 102Y is attached to the front and rear two places on the back of the pressure rail 101Y. A cam shaft 104Y rotatably supported by the main body side plates 91 and 92 is provided at a position corresponding to the pressing leaf spring 102Y.
The pressurizing cam 24Y attached to the photosensitive drum 1 is provided. When the pressurizing cam 24Y rotates, the pressing leaf spring 102Y is pressed, and the yellow developing device 4Y is applied to the photosensitive drum 1 by the pressing leaf spring 102Y. Pressed. When the pressing cam 24Y rotates half a turn and presses the follower portion 105, the pressing rail 101Y slides along the side plates 91 and 92 together with the yellow developing device 4Y, whereby the yellow developing device 4Y Move away from 1.

By the way, as shown in FIG.
4Y is connected to a stepping motor 56Y via a camshaft gear 54Y as a second gear, a two-stage pressurizing gear 53Y as a first gear, and a motor gear 55Y, and is rotationally driven by the stepping motor 56Y. Also, the camshaft gear 54
A position detection flag 51Y is fixed inside Y, and the position of the pressure cam 24Y is controlled by detecting the flag 51Y by a sensor 52Y provided in the pressure unit 110. As a result, the yellow developing device 4Y can be stopped at two positions: the pressurizing / developing position shown in FIG.

The positioning between the yellow developing device 4Y and the photosensitive drum 1 is performed by the front and rear side plates 131 and 13 as shown in FIG.
The developing roller 401 is brought into contact with the abutment rollers 93f and 93b having the same radius as the photosensitive drum 1 fixed to the abutment 2 and the abutment rollers 402f and 402b provided coaxially with the developing sleeve 401. Here, the butting rollers 402f, 4
The radius of 02b is a predetermined gap (the gap between the photosensitive drum 1 and the developing sleeve 401) than the radius of the developing sleeve 401.
The photosensitive drum 1
A predetermined gap is secured between the image forming apparatus and the developing sleeve 401.

Next, a developing unit pressurizing unit 110 (hereinafter, referred to as a developing unit pressing unit)
With respect to the pressure unit 110 and the developing unit pressure drive unit 50 (hereinafter, referred to as the pressure drive unit 50), positioning of each unit and meshing of gears between the units will be described.

The pressing unit 110 includes pressing rails 101Y, 101M, 10
1C, 101K, and camshafts 104Y, 104M, 104
C, 104K, and camshaft gears 54Y, 54M, 54C,
54K and are integrally configured.

To fix the pressure unit 110 to the main body, a positioning pin 111 fixed to the pressure unit rear plate 92 is inserted into a positioning hole 132b of the rear plate 132 of the main unit. This is performed by passing the fixing pin 112 through the hole 131a and the positioning hole 91b of the pressure unit front side plate 91.

On the other hand, the pressurizing drive unit 50 has two pressurizing two-stage gears 53Y, 53M, 53C, 5
3K and motor gears 55Y, 55M, 55C, 55K
And pressurizing motors 56Y, 56M, 56C, 56K, and are integrally formed. The pressure drive unit 50 is fixed to the main body by fitting a positioning hole 57a of the pressure drive side plate 57 into a positioning emboss 132a of the main body rear side plate 132.

As described above, since the pressure unit 110 and the pressure drive unit 50 are independently positioned with respect to the main unit, the cam shaft gear 54 of the pressure unit 110 and the pressure drive unit 50 Pressurized two-stage gear 5
The variation in the distance between the shafts 3 is larger than in the case of positioning between units.

In the case where the positioning reference is the positioning hole 132a, the variation in the center distance between the two-stage pressurizing gear 53Y close to the positioning hole 132a (about 50 mm) and the camshaft gear 54Y is about ± 0.2 mm. Positioning hole 132a
The variation in the center distance between the two-stage pressurizing gear 53K and the camshaft gear 54K, which is farthest (about 300 to 400 mm), is about ± 0.4 mm.

Here, the camshaft gears 54Y, 54M, 54
C, 54K and pressurized two-stage gears 53Y, 53M, 53C,
53K is a high tooth gear which is a high gear.

As shown in FIG.
This is a shape in which the involute tooth profile of the normal tooth profile is extended vertically, and in this case, the distance from the pitch circle to the addendum circle is 1.5 m for the normal tooth profile of 1.0 m (module).

The camshaft gears 54Y, 54M, 54C, 54
K is a high-tooth gear of the 40-tooth module 1 and two-stage pressurizing gears 53Y, 53M, 53C, 53
K is a high tooth gear of the 24-tooth module 1. Therefore, the center distance between the camshaft gears 54Y, 54M, 54C, 54K and the two-stage pressurizing gears 53Y, 53M, 53C, 53K is (40 + 24) / 2 = 32 mm, and when the center distance is shorter than 32 mm. Gear backlash disappears and normal meshing becomes impossible.

The distance between the axes is ±± as described above.
Since a variation of 0.4 mm occurs, the inter-axis distance is set to 32.5 mm so that the backlash can be maintained even when the inter-axis distance becomes the minimum (32 mm).

As a result, the above-mentioned inter-axis distance varies.
When the distance approaches 4 mm, the inter-axis distance becomes 32.1 mm, the backlash of 0.1 mm is maintained, and the two-stage pressurizing gears 53Y, 53M, 53C, 53K and the camshaft gear 5
The amount of overlap with 4Y, 54M, 54C, 54K is kept at 2.9 mm. The amount of gear overlap is the sum of the distances (1.5 mm in this example) from the pitch circle of each gear to the tooth tip circle (1.5 mm in this example).
It is calculated from the difference between 5 mm + 1.5 mm = 3.0 mm) and the backlash amount (0.1 mm in this example).

On the other hand, the above-mentioned distance between the shafts is set to 0.
When it is expanded by 4 mm, the distance between the axes becomes 32.9,
Although the backlash is 0.9 mm, the overlap is kept at 2.1 mm so that the gears can be engaged. (Normally, when the distance between the shafts is 32.9 mm, the gear overlap is only 1.1 mm and the gears are meshed only at the tip of the gear, so that normal drive transmission cannot be performed.) In the embodiment, the two-stage pressurizing gears 53Y, 53M, 53C, 53K and the camshaft gear 54
Since the variation of the center distance between Y, 54M, 54C and 54K is about ± 0.4 mm, the tooth profile of the high tooth is extended vertically by 0.5 module from the normal direction, and only the effective teeth are set to 3 modules to set the center distance. 0.5mm larger
Although 2.5 mm is used, when the variation in the inter-axis distance is small, for example, each gear position is relatively close from the unit positioning reference and is in a range of about 100 mm, and the variation in the inter-axis distance is within ± 0.3 mm. In this case, only the effective teeth of the high tooth profile may be set to 2.6 modules, and the above-mentioned inter-axis distance may be set longer by 0.4 mm to 32.4 mm. When the distance between the axes approaches 0.3 mm and becomes 32.1,
The backlash of 0.1 mm is maintained, and the two-stage pressurizing gears 53Y, 53M, 53C, 53K and the camshaft gear 54
The overlap with Y, 54M, 54C and 54K is 1.
Drive transmission can be maintained at 9 mm.

Further, in the present embodiment, the amount of the increase in the inter-axis distance and the method of obtaining the effective tooth height are not limited to those described above. When the transmission torque is large, the amount of gear overlap is reduced. Priority is given to increasing the tolerance of each component so as to reduce the variation in the inter-axis distance. If the transmission torque is small, loosen the tolerance of each component to increase the variation in the inter-axis distance. The amount of gear overlap may be set small.

According to the present embodiment, the gears 53Y, 53M, 53C, 53K, which are high gears, mesh with the gears 54Y, 54M, 54C, 54K which are high gears, so that the developing device is pressurized. Since the rotational driving force of the motors 56Y, 56M, 56C, 56K provided in the drive unit 50 is transmitted to the developing unit pressurizing unit 110, the motors 56Y, The rotation axes of 56M, 56C, 56K and the rotation axes 104Y, 104M, 104 of the developing unit pressure unit 110
C, 104K can be increased, and even with a small number of components that do not require easy assembling accuracy, the components can be meshed well and the rotational driving force from the developing unit pressurizing drive unit 50 is transmitted to the developing unit pressurizing unit 110. be able to.

[0073]

As described above, according to the first aspect of the present invention, the first gear, which is a high gear, meshes with the second gear, which is a high gear, so that the drive is performed. Since the rotational drive force from the unit is transmitted to the output unit, the distance between the rotation axis of the drive unit and the output unit can be increased, and fewer components that do not require easy assembly accuracy And the rotational driving force from the driving unit can be transmitted to the output unit.

According to the second invention of the present application,
The first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, so that the rotational driving force from the drive unit is transmitted to the output unit. The distance between the output unit and the rotation shaft can be increased, and even with a small number of components that do not require easy assembling accuracy, the output unit can transmit the rotational driving force from the drive unit to the output unit with good engagement.

Further, according to the third invention of the present application, the first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, to output the rotational driving force from the drive unit. Since the power is transmitted to the drive unit, the distance between the rotation shaft of the drive unit and the rotation shaft of the output unit can be increased. Can be transmitted to the output unit.

According to the fourth invention of the present application,
The first gear, which is a high gear, meshes with the second gear, which is a high gear, to transmit the rotational driving force from the drive unit to the output unit, and the developing device separates from the latent image carrier and pressurizes. As a result, the distance between the rotation axis of the driving section and the rotation axis of the output section can be increased, and the rotation driving force from the driving section can be satisfactorily engaged even with a small number of components that do not require easy assembly accuracy. Is transmitted to the output unit, and the developing device can be separated from the latent image carrier and pressed.

Further, according to the fifth invention of the present application, the first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, to output the rotational driving force from the drive unit. The developing device is separated from the latent image carrier and pressurized, so that the distance between the rotating shaft of the driving unit and the rotating shaft of the output unit can be increased, and easy assembly accuracy is required. Even with a small number of constituent components, the developing device can satisfactorily mesh with each other, transmit the rotational driving force from the driving unit to the output unit, and separate and press the developing device from the latent image carrier.

According to the sixth aspect of the present invention,
The first gear, which is a high gear, meshes with the second gear, which is a high gear, to transmit the rotational driving force from the drive unit to the output unit, and the developing device separates from the latent image carrier and pressurizes. As a result, the distance between the rotation axis of the driving section and the rotation axis of the output section can be increased, and the rotation driving force from the driving section can be satisfactorily engaged even with a small number of components that do not require easy assembly accuracy. Is transmitted to the output unit, and the developing device can be separated from the latent image carrier and pressed.

Further, according to the seventh aspect of the present invention, the first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, to output the rotational driving force from the drive unit. Since the power is transmitted to the drive unit, the distance between the rotation shaft of the drive unit and the rotation shaft of the output unit can be increased. Can be transmitted to the output unit.

According to the eighth invention of the present application,
The first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, so that the rotational driving force from the drive unit is transmitted to the output unit. The distance between the output unit and the rotation shaft can be increased, and even with a small number of components that do not require easy assembling accuracy, the output unit can transmit the rotational driving force from the drive unit to the output unit with good engagement.

Further, according to the ninth aspect of the present invention, the first gear, which is a high-tooth gear, meshes with the second gear, which is a high-tooth gear, to output the rotational driving force from the drive unit. Since the power is transmitted to the drive unit, the distance between the rotation shaft of the drive unit and the rotation shaft of the output unit can be increased. Can be transmitted to the output unit.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a schematic configuration of a developing device provided in the image forming apparatus of FIG.

FIG. 3 is a schematic configuration diagram of a drive transmission device provided in the developing device of FIG. 2;

FIG. 4 is a diagram illustrating gears provided in the drive transmission device of FIG. 3;

FIG. 5 is a schematic configuration diagram of a conventional drive transmission device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Photosensitive drum (latent image carrier) 4Y, 4M, 4C, 4K Developing device (developing device) 50 Developing device pressure drive unit (drive unit, drive unit) 53Y, 53M, 53C, 53K One gear) 54Y, 54M, 54C, 54K Camshaft gear (second gear) 110 Developing unit pressurizing unit (driven unit, output unit)

Claims (9)

[Claims] 1. A drive transmission device for transmitting a rotational drive force from a drive unit to an output unit by meshing a first gear and a second gear to output the rotational drive force, wherein the drive unit includes a drive unit. In a drive transmission device having a first gear that rotates by a rotational driving force and an output unit having a second gear that meshes with the first gear and transmits the rotational driving force, the first gear and the second gear are:
A rotary driving force transmission device comprising a high-tooth gear so as to increase a distance between a rotation shaft of a driving unit and a rotation shaft of an output unit. 2. The drive transmission device according to claim 1, wherein the drive unit is a drive unit having a plurality of gears and integrally formed. 3. The drive transmission device according to claim 1, wherein the output unit is a driven unit having a plurality of gears and integrally formed. 4. A developing device for developing a latent image opposite to a latent image carrier for carrying a latent image, comprising a drive transmission device according to claim 1, wherein the developing device is provided with a drive transmission device according to claim 1. A developing device capable of applying pressure. 5. The developing device according to claim 4, wherein the drive unit is a drive unit having a plurality of gears and integrally formed. 6. The developing device according to claim 4, wherein the output unit is a driven unit integrally having a plurality of gears. 7. An image forming apparatus for recording an image formed by a series of image forming processes on a recording medium,
An image forming apparatus comprising the drive transmitting device according to claim 1 or the developing device according to claim 4. 8. The image forming apparatus according to claim 7, wherein the drive unit is a drive unit having a plurality of gears and integrally formed. 9. The image forming apparatus according to claim 7, wherein the output unit is a driven unit having a plurality of gears and integrally formed.