JP7205698B2 - Gears, drive transmission devices, photoreceptor drive devices and image forming devices - Google Patents

Description

The present invention relates to a self-lubricating gear, a drive transmission device, a photoreceptor driving device, and an image forming apparatus using the gear.

2. Description of the Related Art In an electrophotographic image forming apparatus, a large number of gears are used in a photoreceptor driving device and the like. Lubricating oil (grease) is applied to the meshing portions of the gears (self-supply or spot application of grease) in order to suppress friction and noise, extend the life of the gears, and prevent image banding (horizontal stripe image).

Conventional gears are self-lubricating with lubricating oil, for example, as disclosed in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2011-174559) and Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2014-238149). That is, the lubricating oil is stored in the concave portion (the concave portion 6c in FIG. 5 of Patent Document 1, the internal space 7 in FIG. 1 of Patent Document 2) in the gear, and the lubricating oil is applied to the gear surface by the centrifugal force caused by the rotation of the gear. It will become self-sufficient over time.

However, since the concave portion containing the lubricating oil is annularly continuous around the boss portion of the gear, the centrifugal force caused by the rotation of the gear cannot be effectively applied to the lubricating oil, and the lubricating oil supply amount is reduced. was not always sufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to ensure a sufficient amount of lubricating oil to be supplied by effectively acting on the lubricating oil in the gear by the centrifugal force accompanying the rotation of the gear.

In order to solve the above problems, the gear of the present invention comprises at least one compartment defined in the gear in the direction of rotation of the gear and containing lubricating oil, and an outer circumference of the gear adjacent to the tooth flank of the gear. and a communication passage that communicates between the partitioned chamber and the fuel filler port.

According to the present invention, since the compartments containing the lubricating oil in the gear are divided in the direction of rotation of the gear, the centrifugal force caused by the rotation of the gear effectively acts on the lubricating oil in the gear to supply sufficient lubricating oil. can ensure the supply of

1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention; FIG. 2 is a side view of a body frame of the image forming apparatus; FIG. 2 is a side view of the photoreceptor driving device; FIG. 1 is a perspective view of a photoreceptor driving device; FIG. FIG. 4 is a perspective view of two photoreceptor gears and an idler gear; It is (a) a front view of an idler gear, and (b) a side view. It is (a) a front view of an idler gear, and (b) a side view. It is (a) a front view of an idler gear, and (b) a side view. They are (a) a front view, (b) a side view, and (c) a perspective view of an idler gear. They are (a) a front view, (b) a side view, and (c) a perspective view of an idler gear. They are (a) a front view, (b) a side view, and (c) a perspective view of an idler gear. It is (a) a front view of an idler gear, (b) sectional drawing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A gear (idler gear) according to an embodiment of the present invention and a photoreceptor driving device and an image forming apparatus (copier) using the gear will now be described with reference to the drawings. A copying machine is an example of an image forming apparatus, and the image forming apparatus is of course not limited to a copying machine. In other words, the image forming apparatus can be configured as a multi-function machine combining any one of a facsimile machine, a printer, a printing machine, and an inkjet recording apparatus, or at least two or more of these.

The same or corresponding parts in each figure are denoted by the same reference numerals, and redundant description thereof will be appropriately simplified or omitted. Also, the dimensions, materials, shapes, relative positions, and the like in the description of each component are examples, and are not intended to limit the scope of the present invention unless otherwise specified.

In the following embodiments, the "recording medium" is described as "paper", but the "recording medium" is not limited to paper (paper). The "recording medium" includes not only paper but also OHP sheets, fabrics, metal sheets, plastic films, or prepreg sheets in which carbon fibers are previously impregnated with resin.

The term "recording medium" also includes media to which developer and ink can be applied, recording paper, and recording sheets. In addition to plain paper, "paper" includes thick paper, postcards, envelopes, thin paper, coated paper (coated paper, art paper, etc.), tracing paper, and the like.

In addition, the term "image formation" used in the following description refers not only to imparting meaningful images, such as characters and figures, to a medium, but also to imparting meaningless images, such as patterns, to a medium. also means

(Copier configuration)
FIG. 1A is a configuration diagram schematically showing the configuration of a color copier as one embodiment of the image forming apparatus 100. As shown in FIG. Image forming apparatus 100 has sheet feeding device 200 at the bottom and reading device 400 at the top.

Four process units 1K, 1C, 1M, and 1Y as image forming means are provided in the central portion of the main body of the image forming apparatus 100 . These process units form images with developers of respective colors of black (K), cyan (C), magenta (M), and yellow (Y) corresponding to color separation components of a color image.

Each of the process units 1K, 1C, 1M and 1Y has the same configuration except that they have toner bottles 6K, 6C, 6M and 6Y containing unused toner of different colors. Therefore, the configuration of one process unit 1K will be described below, and the description of the other process units 1C, 1M, and 1Y will be omitted.

The process unit 1K has an image carrier 2K (for example, a photosensitive drum), a drum cleaning device, and a static elimination device. The process unit 1K further includes a charging device as charging means for uniformly charging the surface of the image carrier, a developing device as developing means for performing visible image processing of the electrostatic latent image formed on the image carrier, and the like. have. The process unit 1K is detachably attached to the main body of the image forming apparatus 100, and consumable parts can be replaced at the same time.

The exposing device is arranged below each of the process units 1K, 1C, 1M and 1Y installed in this image forming apparatus 100 . The exposure unit is configured to perform write scanning according to image information, that is, to irradiate the image carrier 2K with a laser beam from a laser diode, which is reflected by a mirror on the basis of image data.

A transfer device is arranged above each of the process units 1K, 1C, 1M, and 1Y. The transfer device includes primary transfer rollers 19K, 19C, 19M and 19Y, which are arranged to face the image carriers 2K, 2C, 2M and 2Y with the intermediate transfer belt 16 interposed therebetween.

The intermediate transfer belt 16 circulates while being stretched over primary transfer rollers 19K, 19C, 19M, 19Y, a drive roller 18, and a driven roller 17. As shown in FIG. The secondary transfer roller 20 is arranged in contact with the intermediate transfer belt 16 so as to face the drive roller 18 . If the image carriers 2K, 2C, 2M, and 2Y are first image carriers of respective colors, the intermediate transfer belt 16 is a second image carrier formed by synthesizing those images.

A belt cleaning device is installed downstream of the secondary transfer roller 20 in the running direction of the intermediate transfer belt 16 . A cleaning backup roller is installed on the opposite side of the intermediate transfer belt 16 to the belt cleaning device.

A paper feeding device 200 installed below the image forming apparatus 100 has a tray on which paper P is stacked. The paper feeding device 200 constitutes a recording medium supply section, and can accommodate a large number of sheets of paper P as a recording medium in a bundle. unitized with.

The paper feeding device 200 is detachable from the main body of the image forming apparatus 100 in order to replenish paper and the like. The paper feed roller 60 and the roller pair 50 are arranged above the paper feeder 200 so as to convey the uppermost paper P of the paper feeder 200 toward the paper feed path 32 .

A pair of registration rollers 250 as a separating and conveying unit is arranged immediately upstream in the conveying direction of the secondary transfer roller 20 and can temporarily stop the paper P fed from the paper feeding device 200 . Due to this temporary stop, slack is formed on the leading end side of the paper P, and the skew of the paper P is corrected.

A registration sensor is disposed immediately upstream in the conveying direction of the registration roller pair 250, and the passage of the leading edge of the sheet is detected by this registration sensor. After the registration sensor detects the passage of the leading edge of the paper, the paper hits the registration roller pair 250 and temporarily stops when a predetermined time elapses.

The paper P, which has been bumped against the pair of registration rollers 250 and has slack at its leading edge, is transferred to the secondary transfer roller 20 and the drive roller in time with the timing at which the toner image formed on the intermediate transfer belt 16 is suitably transferred. 18 to the secondary transfer nip. Then, the toner image formed on the intermediate transfer belt 16 is electrostatically transferred to the desired transfer position with high precision by the bias applied at the secondary transfer nip. ing.

The post-transfer conveying path 33 is arranged above the secondary transfer nip between the secondary transfer roller 20 and the drive roller 18 . The fixing device 300 is installed near the upper end of the post-transfer conveying path 33 . The fixing device 300 includes a fixing belt 310 as a fixing member containing a heating member, and a pressure roller 320 as a pressure member rotating while contacting the fixing belt 310 with a predetermined pressure.

A post-fixing conveying path 35 is arranged above the fixing device 300 , and a pair of discharge rollers 37 is arranged near the opening end of the post-fixing conveying path 35 . A paper discharge tray 44 having a concave shape toward the inside of the image forming apparatus 100 is provided on the upper portion of the image forming apparatus 100 outside the paper discharge roller pair 37 .

(Operation of color copier)
Next, the basic operation of the color copier according to this embodiment will be described below with reference to FIG. 1A. First, the case of single-sided printing will be described.

The paper feed roller 60 is rotated by a paper feed signal from the control section of the image forming apparatus 100, as shown in FIG. 1A. Then, the paper feed roller 60 separates only the uppermost paper sheet from the stack of paper sheets P stacked on the paper feeder 200 and feeds it to the paper feed path 32 .

When the leading edge of the paper P sent out by the paper feed roller 60 and the roller pair 50 reaches the nip of the registration roller pair 250, the paper P becomes slack and waits in that state. Then, the optimum timing (synchronization) for transferring the toner image formed on the intermediate transfer belt 16 to the paper P is obtained, and the tip skew of the paper P is corrected.

Here, regarding the image forming operation, one process unit 1K will be explained, and the explanation of the other process units 1C, 1M and 1Y will be omitted. First, the charging device uniformly charges the surface of the image carrier 2K to a high potential. Then, the exposing device irradiates the surface of the image carrier 2K with laser light based on the image data.

On the surface of the image carrier 2K irradiated with the laser beam, the potential of the irradiated portion is lowered to form an electrostatic latent image. The developing device has a developer carrier that carries a developer containing toner, and the unused black toner supplied from the toner bottle 6K is passed through the developer carrier to form an electrostatic latent image. It is transferred to the surface portion of the image carrier 2K.

The image carrier 2K to which the toner has been transferred forms (develops) a black toner image on its surface. Then, the toner image formed on the image carrier 2K is transferred to the intermediate transfer belt 16. FIG.

The drum cleaning device removes residual toner adhering to the surface of the image carrier 2K after the intermediate transfer process. The removed residual toner is transported to and collected by the waste toner conveying means to the waste toner storage section in the process unit 1K. Also, the static eliminator eliminates residual charges on the image carrier 2K from which the residual toner has been removed by the cleaning device.

In the process units 1C, 1M, and 1Y of each color, toner images are similarly formed on the image carriers 2C, 2M, and 2Y, and transferred to the intermediate transfer belt 16 so that the toner images of each color are superimposed. The intermediate transfer belt 16 onto which the toner images of the respective colors are transferred so as to overlap each other travels to the secondary transfer nip between the secondary transfer roller 20 and the driving roller 18 .

On the other hand, the pair of registration rollers 250 sandwiches the sheet of paper that abuts against them and rotates at a predetermined timing. The sheet is conveyed to the secondary transfer nip of the secondary transfer roller 20 . In this manner, the toner image on the intermediate transfer belt 16 is transferred onto the paper P sent out by the registration roller pair 250 .

The paper P onto which the toner image has been transferred is transported to the fixing device 300 through the post-transfer transport path 33 . Then, the sheet P conveyed to the fixing device 300 is sandwiched between the fixing belt 310 and the pressure roller 320, and the unfixed toner image is fixed on the sheet P by applying heat and pressure. The paper P on which the toner image is fixed is sent from the fixing device 300 to the transport path 35 after fixing.

After the toner image on the intermediate transfer belt 16 is transferred to the paper P, residual toner remains on the intermediate transfer belt 16 . A belt cleaning device removes this residual toner from the intermediate transfer belt 16 . Further, the toner removed from the intermediate transfer belt 16 is conveyed to the powder container by the waste toner conveying means and collected in the powder container.

(Body frame and photoreceptor driving device)
Next, the body frame 350 and the photoreceptor driving device 360 of the image forming apparatus 100 will be described. FIG. 2 shows the body frame 350 of the image forming apparatus 100 described above. A pair of left and right body frames 350 are arranged inside the image forming apparatus 100 .

At an intermediate height position of the body frame 350, a photoreceptor driving device 360 for rotationally driving the respective image carriers 2K, 2C, 2M and 2Y is arranged. As shown in FIGS. 3A and 3B, the photoreceptor driving device 360 has four drum gears 400K, 400C, 400M and 400Y corresponding to the four image carriers 2K, 2C, 2M and 2Y.

The rotation shafts of the drum gears 400K, 400C, 400M and 400Y are connected to the rotation shafts of the image carriers 2K, 2C, 2M and 2Y in FIG. 1, respectively. A motor input gear 410, a transfer driving gear 440 and a waste toner driving gear 450 are arranged adjacent to the drum gear 400K at the left end. Motor input gear 410 is in direct mesh with both drum gear 400K and waste toner drive gear 450 .

The transfer driving gear 440 is connected to the drum gear 400K through two intermediate gears 441 and 442. As shown in FIG. This transfer drive gear 440 is connected to the rotation shaft of the drive roller 18 in FIG.
When the motor input gear 410 rotates clockwise, the drum gear 400K and the waste toner drive gear 450 rotate counterclockwise, and the transfer drive gear 440 rotates clockwise.

On the other hand, a motor input gear 420 connected to a motor shaft is arranged between the drum gears 400C and 400M, and an idler gear 430 is arranged between the drum gears 400M and 400Y. When the motor input gear 420 rotates clockwise, the drum gears 400C and 400M rotate counterclockwise, and the idler gear 430 also rotates the drum gear 400Y counterclockwise.

(Configuration of idler gear)
An idler gear 430 as an embodiment of the gear of the present invention will now be described. However, the present invention is applicable not only to the idler gear 430 but also to general gears that transmit driving force, such as the waste toner driving gear and the intermediate gear 441 shown in FIG. 3A. By applying the present invention to a plurality of gears of the photoreceptor driving device 360 in this manner, the lubricating oil can be evenly spread over the four drum gears 400K, 400C, 400M, and 400Y. It goes without saying that the present invention is applicable not only to the gears of the photoreceptor driving device, but also to the gears of general drive transmission devices.

As shown in FIG. 4A, the idler gear 430 has a central boss portion 431 through which the rotating shaft is inserted, an outer peripheral portion 432, and six connecting portions 433 that connect the central boss portion 431 and the outer peripheral portion 432 in the radial direction. In addition, in this embodiment, slanted teeth 432 a are formed on the peripheral surface of the outer peripheral portion 432 . Of course, the number of connecting portions 433 need not be limited to six.

The six connecting portions 433 are arranged at equal intervals in the rotational direction of the idler gear 430, and at least one fan-shaped compartment 434 is formed between the connecting portions 433. As shown in FIG. The partitioned chamber 434 can utilize a portion that has conventionally been hollowed out as a lightening portion. One side of the compartment 434 in the axial direction is closed by a circular side plate portion 435 integral with the idler gear 430 .

A circular flange 436 closes the axially opposite side of the compartment 434 . The flange 436 or the side plate portion 435 may be provided with a filter that allows only air to pass through the compartment 434 and blocks lubricating oil. After injecting grease as lubricating oil into one of the compartments 434, a flange 436 is attached to the side surface of the idler gear 430 and fixed with an adhesive or the like.

An outer peripheral portion 432 of the idler gear 430 is formed with an oil supply port 460 that communicates with the compartment 434 . The fuel filler port 460 communicates with the interior of the compartment 434 through a communication passage 437 formed continuously along the longitudinal direction of the connecting portion 433 .

As shown in FIG. 4A(b), the oil filler port 460 is formed adjacent to the end of one slanted tooth 432a extending obliquely with respect to the axial direction of the idler gear 430, on the leading side in the gear rotation direction. there is Here, the fuel filler port 460 opens in a valley between the slanted teeth 432a. As a result, the lubricating oil discharged from the oil supply port 460 when the idler gear 430 rotates flows to the opposite side along the slanted teeth 432a as the idler gear 430 rotates.

In this way, since the lubricating oil spreads evenly over the slanted teeth 432a of the idler gear 430, it is possible to suppress vibration and noise and prevent banding (horizontal stripes) from appearing on the image. In addition, since the supply of lubricating oil from the oil supply port 460 can be sustained over a long period of time, the banding prevention effect tends to continue over time.

A communication passage 437 communicating between the partitioned chamber 434 and the fuel filler port 460 is formed adjacent to the connecting portion 433 on the side opposite to the rotational direction of the idler gear 430 in the direction of the connecting portion 433 . Therefore, the lubricating oil that has moved to the coupling portion 433 on the side opposite to the rotation direction along with the rotation of the idler gear 430 rotates together with the idler gear 430 while being prevented from moving by the coupling portion 433 . Therefore, the dammed lubricating oil flows outward along the connecting portion 433 due to the centrifugal force, acts as it is, and is smoothly supplied from the oil supply port 460 to the slanted teeth 432a through the communicating passage 437 as it is.

The configuration of FIG. 4A is particularly useful when the lubricant in compartment 434 is running low. That is, since a small amount of lubricating oil gathers at the connecting portion 433 , the centrifugal force effectively acts on the concentrated lubricating oil, and the lubricating oil passes through the communication passage 437 and is discharged from the oil supply port 460 as it is. Therefore, the lubricating oil can be used up (discharged) to the end.

FIG. 4B shows an embodiment in which a circumferentially extending oil filling port 470 is formed so as to communicate with a plurality of troughs between helical teeth 432a. In this embodiment, when the idler gear 430 rotates, the lubricating oil coming out of the oil supply port 470 flows to the opposite side along the plurality of slanted teeth 432a as the idler gear 430 rotates.

FIG. 4C shows an embodiment in which a fuel filler port 480 is formed in the middle of the outer peripheral portion 432 between the connecting portions 433 . When the lubricant in the partitioned chamber 434 runs low, the last lubricant tends to stay on the inner surface of the outer peripheral portion 432 between the connecting portions 433 .

By forming the oil supply port 480 in the middle of the outer peripheral portion 432 between the connecting portions 433 as shown in FIG. .

When the teeth formed on the peripheral surface of outer peripheral portion 432 are spur teeth, the axial position of oil filler port 480 on the outer peripheral surface of outer peripheral portion 432 is not particularly limited. In FIG. 4C, the oil filler port 480 is formed slightly to the right in the axial direction, but the oil filler port 480 may be formed on the opposite side in the axial direction or at the central position.

4A-4C are embodiments formed in any one of the plurality of compartments 434, the fuel filler openings 460-480 are formed in each of the plurality of compartments 434. good too. 5A-5D illustrate an embodiment in which a plurality (six) of compartments 434 are each formed with a filler port 460. FIG.

By forming the oil supply port 460 in all of the six partitioned chambers 434, the lubricating oil (grease) can be injected into any one of the partitioned chambers 434, so that the idler gear 430 can be easily assembled. In addition, since the partitioned chamber 434 contains lubricating oil, there is no problem that the lubricating oil adheres to the hands when the idler gear 430 is assembled to the photoreceptor driving device 360 .

In each partitioned chamber 434 , each oil supply port 460 opens at a position continuous with the connecting portions 433 and 433 a on the side opposite to the rotation direction of the idler gear 430 . 5A to 5D, since the fuel filler port 460 is close to the partitioned chamber 434, the reference numerals of the communication passage 437 in FIGS. 4A to 4C are omitted.

The connecting portion 433 of FIG. 5A extends radially with a constant width. On the other hand, the connecting portion 433a in FIG. 5B decreases in width as it goes radially outward (toward the distal end). For this reason, the connecting portion 433a is gently downward inclined toward the oil filler port 460 in the radial direction of the idler gear 430, and the lubricating oil in the partition chamber 434 is more likely to flow toward the oil filler port 460 than in the case of FIG. 5A due to the centrifugal force caused by the rotation of the idler gear 430. easier to flow towards.

In FIG. 5C, spur teeth 432b are formed on the peripheral surface of the outer peripheral portion 432 of the idler gear 430. FIG. 5A except that the peripheral surface of the outer peripheral portion 432 is flat teeth 432b. In the case of the spur gear 432b, it cannot be expected that the lubricating oil coming out of the oil filling port 460 will actively flow to the opposite side due to the rotation of the idler gear 430, but the lubricating oil naturally spreads over the entire gear due to the meshing of the gears.

FIG. 5D(b) shows a cross-sectional shape along line bb in FIG. 5D(a). In order to effectively apply the centrifugal force due to the rotation of the idler gear 430 to the flow of lubricating oil, the cross-sectional shape of the flange portion 433b connecting the central boss portion 431 and the outer peripheral portion 432 of the idler gear 430 is inclined upward toward the oil filler port 460. 433c.

By doing so, the lubricating oil in the partitioned chamber 434 can easily flow to the oil supply port 460 along the upward slope 433c due to the centrifugal force caused by the rotation of the idler gear 430 . If there is no upward slope 433c, part of the lubricating oil may remain on the inner peripheral surface of the outer peripheral portion 432 in FIGS. 5A and 5C.

Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments, and can be variously modified within the scope of the technical idea described in the claims. Needless to say. For example, in FIGS. 5A-5D all the compartments 434 are provided with a fuel filler opening 460, but every other compartment 434 may be provided with a fuel filler opening 460. In this case, it is possible to prevent erroneous filling by making the partitioned chamber 434 with the lubrication port 460 to be filled with lubricating oil different in size and shape from the other partitioned chambers.

5A to 5D, the compartment 434 and the fuel filler port 460 are close to each other, but if the diameter of the gear is large enough, the compartment 434 and the fuel filler port 460 may be formed far apart. In that case, the partitioned chamber 434 and the fuel filler port 460 are connected by the communication passage 437 . The communicating path 437 may be formed in the radial direction, or the outer end of the communicating path 437 may be inclined in the direction opposite to the gear rotation direction. As a result, the component force of the acceleration force at the time of starting the gear can act on the lubricating oil in the communication passage 437 in the discharge direction.

1K, 1C, 1M, 1Y: Process unit 2K, 2C, 2M, 2Y: Image carrier
6K, 6C, 6M, 6Y: toner bottle 16: intermediate transfer belt 17: driven roller 18: drive roller
19K, 19C, 19M, 19Y: primary transfer roller 20: secondary transfer roller 32: paper feed path 33: post-transfer transport path 35: post-fixing transport path 37: paper discharge roller pair 44: paper discharge tray 50: roller pair 60 : Paper feeding roller 100: Image forming apparatus 200: Paper feeding device 250: Registration roller pair 300: Fixing device 310: Fixing belt 320: Pressure roller 350: Body frame 360: Photoconductor driving device 400: Reading device
400K, 400C, 400M, 400Y: drum gear 410, 420: motor input gear 430: idler gear 431: central boss portion 432: outer peripheral portion 432a: slanted tooth 432b: flat tooth 433, 433a: connecting portion 433b: flange portion 433c: upward slope 434: Compartment 435: Side plate 436: Flange 437: Communication path 440: Transfer drive gear 440: Oil supply 441: Intermediate gear 450: Waste toner drive gear 460-480: Oil supply port P: Paper

Japanese Patent No. 6388197 JP-A-2002-21978

Claims (8)

at least one compartment defined within the gear in the direction of rotation of the gear and containing a lubricating oil;
a lubricating port formed in the outer peripheral portion of the gear so as to be adjacent to the tooth surface of the gear;
Having a communication passage that communicates the partitioned chamber and the fuel filler port ,
The outer peripheral portion and the central boss portion of the gear are connected by a plurality of connecting portions extending in the radial direction of the gear, and the connecting portions partition the compartments in the rotational direction of the gear,
A gear, wherein the width of the connecting portion in the direction of rotation of the gear decreases radially outwardly of the connecting portion . 2. A gear according to claim 1, wherein said communication passages are formed in the radial direction of the gear. 3. A gear according to claim 1, wherein said communicating passage is formed adjacent to said connecting portion. 4. A gear according to claim 3 , wherein said communication path is formed along the direction in which said connecting portion extends. A helical tooth is formed on the outer peripheral portion of the gear, and one helical tooth extending obliquely with respect to the axial direction of the gear or a plurality of continuous helical teeth is adjacent to the end on the leading side in the gear rotation direction, 5. A gear according to any one of claims 1 to 4 , characterized in that it is formed with an oil filling port. A photoreceptor driving device comprising at least one gear according to any one of claims 1 to 5 . An image forming apparatus comprising the photosensitive member driving device according to claim 6 . A drive transmission device using at least one gear according to any one of claims 1 to 5 .

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