JP3991005B2 - Driving force transmission mechanism in image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission mechanism in an image forming apparatus such as a copying machine, a printer, a facsimile, or a composite machine using an electrophotographic method, and in particular, a single motor and a drive plate made of a single plate material. A driving force transmission mechanism that mainly transmits the driving force from the motor to a paper feeding / conveying system, a process unit system composed of a photoreceptor and a developing device, a fixing / paper discharging system, and the like. The present invention relates to a driving force transmission mechanism in an image forming apparatus provided with a clutch that transmits and disconnects accordingly.
[0002]
[Prior art]
In image forming apparatuses such as copiers, printers, facsimiles, and their combined machines using an electrophotographic system, recording paper stored in a recording paper storage device or recording paper placed on a manual paper feed mechanism is picked up and registered. Paper feeding / conveying system to be sent to a roller, a photosensitive member that exposes an image to form a latent image and a latent image on the photosensitive member are developed into a toner image. It is necessary to drive various parts such as a process unit system that transfers an image to a recording sheet that is sent and a fixing / discharge system that heats, fixes, and discharges the recording sheet onto which the toner image is transferred. For this reason, an image forming apparatus using a motor for each drive system has been conventionally produced. However, with the personalization of the image forming apparatus itself, there is a need for downsizing and cost reduction, and the number of motors is reduced as much as possible. There is a demand for an image forming apparatus that is reduced in number and excellent in assemblability.
[0003]
For this reason, for example, in Patent Document 1, a drum driving gear that transmits a driving force to a photosensitive drum, a conveying driving gear that transmits a driving force to a conveying clutch , and a fixing driving gear that transmits a driving force to a fixing unit are arranged on one side. A gear unit having a support member integrally supported on the image forming apparatus is provided so that the gear can be attached so as to be sandwiched between the frame of the image forming apparatus and the support member. The drive force from the motor is transmitted separately to the two gears of the drum transport drive system and fixing discharge drive system provided on the left and right sides of the drive shaft, and the drive shaft of the motor is tilted down. An image forming apparatus having a gear unit that improves the load balance is proposed.
[0004]
In addition, as described above, the drive power is transmitted to the places where the drive power is required in the image forming apparatus, such as a paper feed / conveyance system with only a single motor, a process unit system composed of a photoreceptor and a developing device, and a fixing / discharge system If transmitting the driving force mechanism, in order to be able to convey only the recording paper when it came conveyance command, although etc. electromagnetic clutch and spring clutch is used, the gear used for driving force transmission mechanism driving In order to transmit force smoothly and to quiet the sound, grease is generally used, and this grease transmits driving force, and the connecting part (friction surface) between the clutch rotor and armature, which is a cutting means. In some cases, slipping occurs and the conveyance roller cannot be driven at an accurate timing, causing miscopying or jamming.
[0005]
In order to cope with such a situation, Patent Document 2 discloses a registration in which an electromagnetic clutch is used to correct the skew of the recording paper sent in the image forming apparatus and start conveying the recording paper at a predetermined timing. In the roller, the toner used for the drive from the process unit such as the developing unit and the cleaner arranged around the photosensitive member, the grease used for driving, and in some cases, the metal powder of the driving unit is connected to the rotor of the electromagnetic clutch and the armature Even if the electromagnetic clutch is turned on, it slips even if the electromagnetic clutch is turned on, and the registration roller cannot be driven at an accurate timing, and the leading edge of the toner image on the photosensitive drum and the leading edge of the recording paper In order to prevent mis-copied due to the inability to match, and to prevent jamming if worse, A cover covering the connecting portion between the pitch and the driving force transmitting means is provided, the image forming apparatus of foreign matter such as toner and the like does not enter the connecting portion is shown.
[0006]
[Patent Document 1]
JP-A-6-314001 [Patent Document 2]
Japanese Patent Laid-Open No. 2003-40480
[Problems to be solved by the invention]
However, the apparatus described in Patent Document 1 is made of a single plate in which a gear unit that transmits driving force to a drum driving gear, a conveyance driving gear, and a fixing driving gear with a single motor is partially bent. However, it prevents the above-described grease from entering between the connecting portion (friction surface) between the rotor and armature of the clutch, which is a driving force transmission / disconnection means, and causing slippage and miscopying or jamming. There is no description of the method, and the image forming apparatus disclosed in Patent Document 2 uses a complicated and expensive means of providing a cover that covers the coupling portion between the electromagnetic clutch and the driving force transmission means, and Since only the cover is provided at the connecting portion, there is a possibility that grease or the like enters through the cover.
[0008]
Therefore, the present invention provides a driving force transmission mechanism in an image forming apparatus that can prevent grease and the like from entering between a connecting portion (friction surface) between a rotor and an armature of a clutch with a simple configuration. This is a problem.
[0009]
[Means for Solving the Problems]
Therefore, in the present invention, a single motor and a plurality of clutches are fed to one surface side of a drive plate constituted by a single plate material, and the driving force of the single motor is fed by a gear through the plurality of clutches. A driving force transmission mechanism in an image forming apparatus in which a gear train that transmits to a conveyance system roller is disposed on the other side of the drive plate ;
A two-stage gear is incorporated in the gear train for transmitting the driving force from the motor to each of the clutches, and the front-stage gear to which the driving force from the motor is transmitted, for example, has a large diameter and is driven to the clutch. The rear stage gear for transmitting the force has a small diameter, and lubricating oil is used for the front stage gear, and no lubricating oil is used for the rear stage gear .
[0010]
Thus transmitting the driving force to the roller of the sheet feeding and conveying system, by a gear for transmitting driving force to the clutch to disconnect the two-stage gear, Chi sac this two-stage gear, the driving force from the motors By using a large diameter gear on the front stage and a small diameter on the rear gear that transmits the driving force to the clutch that cuts and transmits the driving force, the front gear is loaded, so grease such as grease is used. Can transmit the driving force smoothly and the sound is quieter, but the load on the subsequent gears is reduced, so no lubricating oil (such as grease) is required, and the clutch rotor and armature as described above are connected. lubricating oil between the parts (friction surface) enters (grease) can be prevented that such cause miscopies and jam causing a slip, and is not necessary that such covered by the cover connecting portions of the clutch Et al., Simple, it is possible to provide a driving force transmission mechanism in the image forming apparatus causing no miscopies or jam with an inexpensive configuration.
[0011]
And, by setting the one upstream gear of the two-stage gear in the driving force transmission mechanism as the first-stage gear, the flexibility of the layout of the driving force transmission mechanism is increased by changing the diameter of the first-stage gear. It is possible to secure the degree of freedom of design and easily cope with minor changes.
[0012]
Further, as described above, the two-stage gear in the driving force transmission mechanism uses lubricating oil for the gear to which the driving force is transmitted from the motor side, and transmits the driving force to the clutch that transmits and disconnects the driving force. a gear for transmitting the you do not use the lubricating oil.
[0013]
Furthermore, the rear plate of the two-stage gear can be detached from the other side of the drive plate by arranging the rear-stage gear of the smaller diameter on the side closer to the drive plate and the front-stage gear of larger diameter away from the rear stage gear to the drive plate. And the two-stage gear is composed of a small-diameter gear and a large-diameter gear, and the drive plate transmits the driving force in the two-stage gear to the clutch for cutting and disconnecting the drive plate as the small-diameter gear. Providing a drive force transmission mechanism in an image forming apparatus with good maintainability can be provided because there is nothing that obstructs the attachment / detachment of the drive force transmission / disengagement clutch to / from the drive plate. it can.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. This is just an example.
[0015]
FIG. 1 is a conceptual diagram for explaining the main components of an image forming apparatus using a driving force transmission mechanism in an image forming apparatus according to the present invention and a conveyance path of a recording paper, and FIG. 2 is a driving force transmitting mechanism according to the present invention. FIG. 3 is a perspective view seen from the driving force transmission mechanism side excluding the outer cover of the image forming apparatus using FIG. 3, and FIG. 3 shows a gear train constituting the driving force transmission mechanism in the image forming apparatus according to the present invention. FIG. 4 is a perspective view seen from the exterior side of the image forming apparatus with the drive plate removed, and FIG. 4 is the image forming apparatus main body side with the gear train constituting the driving force transmission mechanism in the image forming apparatus according to the present invention attached to the drive plate. FIG. 5 is a view showing another configuration example of the driving force transmission mechanism to the registration rollers.
[0016]
In the figure, 1 is a paper feed cassette containing recording paper 2, 3 is a pickup roller for picking up the recording paper 2, 4 is a separation / feed roller for separating and feeding the picked up recording paper 2 one by one, and 5 is an intermediate roller , 6 is a second paper feed roller that feeds the recording paper placed in the manual paper feed unit one by one, and 7 is the posture of the recording paper 2 that has been fed and is adjusted to the timing of toner image formation on the photoreceptor 8. , A registration roller that is sent to a transfer position, 8 is a photosensitive member (image carrier), 9 is a transfer roller, 10 is a fixing roller, 11 is a discharge roller, 12 is a pickup roller 3, intermediate roller 5, and second paper feed roller 6 , A registration roller 7, a photoreceptor (image carrier) 8, a fixing roller 10, a motor that sends driving force to the discharge roller 11, 13 is a conveyance path for recording paper from the paper feed cassette 1, and 14 is a manual paper feed unit Manual feed conveying path of the recording paper 15 is conveyed path from the intermediate roller 5 to the discharge roller 11. Of these, the pickup roller 3, the intermediate roller 5, the second paper feeding roller 6, the registration roller 7 and the like are paper feeding / conveying systems, and a charging device, not shown, is provided around the photosensitive member 8. An exposure device, a developing device, a cleaning blade, and the like are arranged to form a process unit, and a fixing / discharge system is configured by the fixing roller 10, the discharge roller 11, and the like. Further, a conveyance guide and a conveyance roller (not shown) are provided from the paper feed roller 4 to the intermediate roller 5, from the intermediate roller 5 to the registration roller 7, from the photoconductor 8 to the fixing roller 10, and from the fixing roller 10 to the discharge roller 11. ing.
[0017]
In FIG. 2, 20 is an apparatus main body from which the outer cover of the image forming apparatus is removed, 21 is a base frame of the image forming apparatus in which a driving force transmission mechanism is arranged, and 22 is a drive plate for mounting a gear train, a motor 12 and the like in the driving force transmission mechanism. , 23 is a control box of the image forming apparatus, and 24 is a spring clutch 25 that transmits and cuts driving force to the second paper feed roller 6 for sending the recording paper 2 from the manual feed path 14 to the registration roller 7. A flapper solenoid, 26 is an intermediate clutch for controlling the rotation and stop of the intermediate roller 5, and 27 is a registration clutch assembly member (hereinafter simply referred to as a registration clutch) comprising a registration clutch body and a clutch holder for controlling the rotation and stop of the registration roller 7. , 28 is a paper feed clutch that controls the rotation and stop of the pickup roller 3. It is. The spring clutch 25, the flapper solenoid 24, an intermediate clutch 26 for controlling the rotation and stop of the intermediate roller 5, and a resist clutch assembly member (hereinafter simply referred to as a resist) comprising a registration clutch body and a clutch holder for controlling the rotation and stop of the registration roller 7. 27), a paper feed clutch 28 for controlling the rotation and stop of the pickup roller 3, and the like can be attached to and detached from the drive plate 22 from the exterior side of the image forming apparatus main body 20.
[0018]
3 and 4, 30 is a gear provided on the drive shaft of the motor 12, 31 is a paper feeding / conveying system, an intermediate gear for transmitting driving force to the fixing / paper discharging system, and 32 and 33 are from the intermediate gear 31. An intermediate gear composed of a two-stage gear that transmits driving force to the intermediate gears 34, 38, and 47, 34 is an intermediate gear that transmits driving force to the two-stage gears 35 and 36, and 37 is transmitted from the two-stage gear 36. A gear 38 of the sheet feeding clutch 28 is an intermediate gear that transmits a driving force from the second gear 33 and transmits a driving force to the gear 41 of the intermediate clutch 26 via the second gears 39 and 40, and 42 and 43 are the intermediate clutch 26. The gear 41 transmits the driving force from the gear 41 to the gear 44 of the spring clutch 25, 45 indicates the boss portion of the intermediate gear 38, 46 indicates the boss portion of the gear 47 that transmits the driving force to the gear 48 of the resist clutch 27, and 49 indicates the resist clutch. 27, output gears 50, 51, and 52 are gear trains that transmit driving force to a fixing / discharge system (not shown), and 53 is a process unit driving gear that transmits driving force to a process unit (not shown). , 60 is a registration gear that is connected to the registration roller 7 and receives a driving force from the output gear 49 of the registration clutch 27, and 61 is a three-stage gear by adding one more stage to the two-stage gears 32, 33. The eye gear, 62 is an intermediate gear, and 63 and 64 are two-stage gears.
[0019]
First, based on FIG. 1, an outline of an operation of an embodiment of an image forming apparatus using a driving force transmission mechanism in the image forming apparatus according to the present invention will be described. A motor 12 provided on one surface of a drive plate 22 supplies power. A pickup roller 3 for picking up the recording paper 2 stored in the paper cassette 1, a separation / feed roller 4 for separating the recording paper 2 one by one, an intermediate roller 5, and a sheet of recording paper placed in the manual paper feed unit The second paper feed roller 6 that feeds out the paper, the orientation of the fed recording paper 2 is corrected, the registration roller 7 that feeds the recording paper to the transfer position in accordance with the toner image formation timing on the photoconductor 8, and the photoconductor (image carrier) Body) 8 and a process unit composed of a charging device, an exposure device, a developing device, a cleaning blade, etc. (not shown) arranged around it, a fixing roller 10, a discharge roller And La 11 are driven. Among them, the pickup roller 3, the intermediate roller 5, the second paper feed roller 6, the registration roller 7, the fixing roller 10, and the discharge roller 11 are the paper feed clutch 28 (corresponding to the pickup roller 3) as shown in FIG. An intermediate clutch 26 (corresponding to the intermediate roller 5), a spring clutch 25 (second feeding roller 6), a registration clutch 27 (corresponding to the registration roller 7), a fixing clutch, a discharge clutch, etc., not shown, When necessary, the driving force is transmitted to rotate.
[0020]
Now, when an image formation instruction is received from a control device (not shown), the photosensitive member 8 is exposed by an exposure device (not shown) to form a latent image, and the latent image is developed by a developing device (not shown). Thus, a toner image is formed. On the other hand, the recording paper 2 stored in the paper feed cassette 1 is picked up by the pickup roller 3 and separated one by one by the separation roller 4, then sent to the intermediate roller 5, and further sent to the registration roller 7. Then, the registration roller 7 sends the toner image on the photosensitive member 8 to the transfer position in accordance with the timing at which the toner image is formed. The biased transfer roller 9 records the toner image on the photosensitive member 8 as a printing medium. Transferred to paper 2. The recording paper 2 onto which the toner image has been transferred is sent to the fixing roller 10 of the fixing device to be fixed, and is discharged by the discharge roller 11. That is, the pickup roller 3 picks up the recording paper 2 stored in the paper supply cassette 1 when an image formation instruction is received by the paper supply clutch 28, and the second paper supply roller 6 moves the recording paper 2 to the manual feed path 14. Is rotated by the spring clutch 25 to feed the recording paper 2 to the intermediate roller 5. On the other hand, when the recording paper 2 is fed by the pickup roller 3 and the second paper feeding roller 6, the intermediate roller 5 is rotated by the intermediate clutch 26 to send the recording paper 2 to the registration roller 7. The registration clutch 27 is configured to feed the recording paper 2 in accordance with the timing at which the toner image is formed on the photosensitive member 8 and the leading edge of the toner image comes to the position of the transfer roller 9.
[0021]
Next, the outline of the present invention will be described. In the present invention, as shown in FIGS. 2, 3, and 4, and as described above, the motor 12 is mounted on one surface of the drive plate 22 formed of a single plate material. A gear train constituting a driving force transmission mechanism for transmitting a driving force to the sheet feeding / conveying system is provided on the other side, and further, a sheet feeding / conveying system roller, that is, an intermediate roller 5, a pickup roller 3, a second sheet feeding roller 6, An intermediate clutch 26, a paper feed clutch 28, a spring clutch 25, a registration clutch 27, and the like for transmitting and disconnecting the driving force to the registration roller 7 are detachably attached to the drive plate 22 from the exterior surface side of the image forming apparatus. Gears 39, 40, 35, and 36 for transmitting driving force to the clutches 26 and 28, for example, are used as two-stage gears for transmitting and cutting the driving force to the paper / conveyance system. 0,36 to those who do not use a lubricating oil such as grease.
[0022]
That is, of the two-stage gears 39, 40, 35, and 36, for example, the front-stage gears 39 and 35 to which the driving force from the motor 12 is transmitted have a large diameter, and the rear-stage gear 40 that transmits the driving force to the clutches 26 and 28. , 36 has a small diameter so that a load is applied to the gears 39 and 35 at the front stage, so that the use of lubricating oil such as grease can transmit the driving force more smoothly and the sound becomes quieter. , 36, the need for using lubricating oil such as grease is reduced. Therefore, if the use of lubricating oil such as grease for the subsequent gears 40 and 36 is stopped, the lubricating oil (grease) enters between the connecting portions (friction surfaces) of the rotors of the clutches 26 and 28 and the armature, causing slippage. Since it is possible to prevent miscopying and jamming, and it is not necessary to cover the connecting part with the clutch with a cover, it is possible to transmit driving force in an image forming apparatus that does not cause miscopying or jamming with a simple and inexpensive configuration. A mechanism can be provided.
[0023]
Further, the rear gears (small-diameter gears) 40, 36 of the two-stage gears 39, 40, 35, 36 are arranged in the vicinity of the drive plate 22, and the front gears (large-diameter gears) 39, 35 are disposed on the far side of the drive plate 22. Therefore, when the clutches 26 and 28 are attached to and detached from the drive plate 22, there is nothing that obstructs the attachment and detachment. Therefore, it is possible to provide a driving force transmission mechanism in an image forming apparatus with good maintainability. Furthermore, the intermediate gears 34 and 38 upstream of the two-stage gears 39, 40, 35, and 36 are set as the first-stage gear, and the layout of the driving force transmission mechanism can be freely changed by changing the diameter of the first-stage gear. The degree of freedom can be increased, design freedom is ensured, and it is easy to deal with minor changes.
[0024]
That is, in the driving force transmission mechanism according to the present invention, the driving force from the motor 12 is transmitted by the gear 30 to the paper feeding / conveying system, the intermediate gear 31 that transmits the driving force to the fixing / paper discharging system, and the gear 53 that drives the process unit. Is transmitted to the intermediate gears 32 and 33 constituted by two-stage gears, and the intermediate gear 34, the intermediate gear 38 and the gear 47 are driven. Further, a driving force is transmitted from the intermediate gear 34 to the two-stage gears 35 and 36, and when the gear 37 of the paper feed clutch 28 is driven and the clutch 28 is connected, the pickup roller 3 is driven. Further, the driving force is transmitted from the intermediate gear 38 to the two-stage gears 39 and 40, and further the driving force is transmitted to the gear 41 of the intermediate clutch 26 to drive the intermediate roller 5. Further, the gear 44 of the spring clutch 25 is driven from the gear 41 of the intermediate clutch 26 via the gears 42 and 43, and the second paper feed roller 6 is driven when the recording paper is placed on the manual paper feed unit. Then, the recording paper 2 is sent out. The driving force is transmitted from the gear 47 to the gear 48 of the registration clutch 27. When the recording paper 2 feed command is received by the registration clutch 27, the output gear 49 of the registration clutch 27 rotates to drive the registration roller 7. Is done.
[0025]
As described above, according to the present invention, the gear that transmits the driving force to the electromagnetic clutch to be cut and transmitted to the paper feeding / conveying system is a two-stage gear, and the subsequent gear that transmits the driving force to the electromagnetic clutch has a small diameter. As a result, the load on the gear is reduced and the lubricating oil (grease) becomes unnecessary. Therefore, it is possible to prevent lubricating oil (grease) from entering between the coupling part (friction surface) between the rotor and armature of the clutch, causing slipping and miscopying or jamming, and covering the coupling part with the clutch. Therefore, it is possible to provide a driving force transmission mechanism in an image forming apparatus that does not cause miscopying or jamming with a simple and inexpensive configuration.
[0026]
In the above description, the case where the driving force is transmitted to the registration clutch 27 for transmitting / disconnecting the driving force to the registration roller 7 is performed by the first gear 47 as shown in FIG. That is, in FIG. 5A, reference numeral 7 denotes a registration roller, and a gear 60 for driving the registration roller 7 is driven by an output gear 49 of the registration clutch 27. A driving force is transmitted to the gear 48 of the registration clutch 27 via the step gear 47. As is apparent from FIG. 1, since the registration roller 7 is provided in the vicinity of the process unit including the photosensitive member 8, if the clutch is directly connected to the shaft of the registration roller 7, it interferes with the process unit drive gear 53. If this problem is not present, the gear for transmitting the driving force to the registration clutch 27 can be made into a two-stage gear as shown in FIG. That is, in FIG. 5 (B), the second gear 32, 33 is further provided with a gear 61, and the gear 63, 63, which is a second gear through the gear 61, is changed from the gear 61 to the gear 48 of the registration clutch 27. If the driving force is transmitted and thereby the registration roller 7 is driven, the gear for transmitting the driving force to the registration clutch 27 can be made into a two-stage gear.
[0027]
【The invention's effect】
As described above, according to the present invention, a two-stage gear is incorporated in the gear train that transmits the driving force from the motor to each of the clutches. The front gear that can be transmitted has a large diameter, the rear gear that transmits the driving force to the clutch has a small diameter, lubricant is used for the front gear, and no lubricant is used for the rear gear . Since gears are loaded, the use of lubricating oil such as grease can transmit the driving force more smoothly and the sound is quieter. However, since the load on the subsequent gear is reduced, lubricating oil (such as grease) is not required. , the connecting portion between the rotor and the armature of the lubricating oil between the (friction surface) enters (grease) can be prevented that such cause miscopies and jam causing slippage, and the clutch Since there is no need that such connecting portion is covered with a cover of easily, it is possible to provide a driving force transmission mechanism in the image forming apparatus causing no miscopies or jam with an inexpensive configuration. In addition, in connection with the fact that it is not necessary to cover the connecting portion with the clutch , the outer diameter shape can be reduced even when the same function is provided, and the degree of freedom in design can be improved. Become.
[0028]
And, by setting the one upstream gear of the two-stage gear in the driving force transmission mechanism as the first-stage gear, the flexibility of the layout of the driving force transmission mechanism is increased by changing the diameter of the first-stage gear. It is possible to secure the degree of freedom of design and easily cope with minor changes.
[0029]
Further, the clutch for transmitting and disconnecting the driving force can be attached to and detached from the drive plate from the exterior side in the image forming apparatus, and the two-stage gear is composed of a small-diameter gear and a large-diameter gear. By providing a gear that transmits the driving force to the clutch that transmits and disconnects the driving force as the small-diameter gear on the drive plate side, when the driving clutch transmits and disconnects the clutch to and from the drive plate, it is obstructed. Since there is nothing, it is possible to provide a driving force transmission mechanism in an image forming apparatus with good maintainability.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram for explaining main components of an image forming apparatus using a driving force transmission mechanism in an image forming apparatus according to the present invention and a conveyance path of a recording sheet.
FIG. 2 is a perspective view of the image forming apparatus using the driving force transmission mechanism according to the present invention as viewed from the driving force transmission mechanism side excluding the outer cover.
FIG. 3 is a perspective view of a gear train constituting a driving force transmission mechanism in the image forming apparatus according to the present invention as viewed from the exterior side of the image forming apparatus with a drive plate to which the gear train is attached removed.
FIG. 4 is a perspective view as seen from the image forming apparatus main body side in a state where a gear train constituting a driving force transmission mechanism in the image forming apparatus according to the present invention is attached to a drive plate.
FIG. 5 is a diagram illustrating another configuration example of a driving force transmission mechanism to a registration roller.
[Explanation of symbols]
24 Flapper solenoid 25 Spring clutch 26 Intermediate clutch 27 Registration clutch 28 Paper feed clutch 30 Gear 31 provided on the drive shaft of the motor 12 Intermediate gears 32 and 33 2 for transmitting driving force to the paper feed / conveyance system and the fixing / paper delivery system Intermediate gear 34 composed of step gears Intermediate gear 35, 36 Two-stage gear 37 Gear 38 of paper feed clutch 28 Intermediate gear 39, 40 Two-stage gear 41 Gears 42, 43 of intermediate clutch 26 Gear 44 Gear 45 of spring clutch 25 The shaft 46 of the intermediate gear 38 The shaft 47 of the gear 47 The gear 48 The gear 49 of the registration clutch 27 The output gears 50, 51, 52 of the registration clutch 27 A gear train 53 that transmits the driving force to the fixing / discharge system 53 Process unit drive gear

Claims (2)

A single motor and a plurality of clutches are transmitted to one side of a drive plate made of a single plate material, and the driving force of the single motor is transmitted to the paper feed / conveyance system rollers by means of gears via the plurality of clutches. In the drive force transmission mechanism in the image forming apparatus in which the gear train to be arranged on the other surface side of the drive plate ,
A two-stage gear is incorporated in the gear train that transmits the driving force from the motor to each of the clutches, and the front-stage gear that transmits the driving force from the motor, for example, has a large diameter and is driven to the clutch. A driving force transmission mechanism in an image forming apparatus, characterized in that a rear gear for transmitting force has a small diameter, lubricant is used for a front gear, and no lubricant is used for a rear gear . By arranging the small rear gear in the two-stage gear on the side closer to the drive plate and the large front gear in the direction away from the rear gear to the drive plate, it is possible to detach from the other side of the drive plate. The driving force transmission mechanism in the image forming apparatus according to claim 1.

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