JP2017211570A - Drive transmission device and image forming device including drive transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive transmission device capable of suppressing occurrence of an impact noise and a vibration, and an image forming device with the same.SOLUTION: A drive transmission device 6 includes: a first toothless gear 621; and a second toothless gear 622 coaxially arranged with the first toothless gear 621. The first toothless gear 621 is engageable with a second input gear 612 engaged with a first input gear 611 rotatable to a first shaft 613 by a drive force from a drive source. The second toothless gear 622 is rotatably inserted into a second shaft 633 and engageable with a first output gear 631. A drive force is outputted from a second output gear 632 engageable with the first output gear 631. The first output gear 631 and the second output gear 632 are arranged by having a clearance with the second shaft 633 in a radial direction, and engaged with each other by having a predetermined output rotation clearance in a rotation direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a drive transmission device that transmits a driving force to a rotating body, and an image forming apparatus including the drive transmission device.

  Image forming apparatuses such as full-color laser printers and copying machines include various rotating bodies such as rollers. For this reason, the image forming apparatus includes a drive source for driving the rotating body and a drive transmission device that transmits a driving force generated by the driving source to the rotating body at a predetermined timing (Patent Document). 1).

  This type of drive transmission device meshes with a missing tooth gear having a missing tooth portion that rotates by transmission of a driving force from a drive source, a solenoid that regulates rotation of the missing tooth gear at a predetermined timing, and a missing tooth gear. And an output gear that is provided so as to output a driving force to the rotating body. In the drive transmission device, the restriction by the solenoid is released at a predetermined timing and the chipped gear rotates, and when the tooth part on the most downstream side in the rotational direction of the chipped gear reaches the tooth part of the output gear, the output gear rotates. The driving force is transmitted to the rotating body.

JP 2006-266399 A

  As described above, in the drive transmission device provided with the chipped gear, when the rotation of the output gear is started, the teeth of the chipped gear that rotates at a constant speed collide with the teeth of the stationary output gear. To do. As described above, when the tooth portion of the missing gear collides with the tooth portion of the output gear, an unpleasant impact sound is generated for the user, and the image forming apparatus may vibrate. When the image forming apparatus vibrates due to the collision between the tooth portions, a streak-like image defect may occur in the image formed on the sheet.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an impact sound and a vibration in a drive transmission device that transmits a driving force from a driving source to a rotating body at a predetermined timing. It is an object of the present invention to provide a drive transmission device capable of suppressing generation and an image forming apparatus including the drive transmission device.

  A drive transmission device according to an aspect of the present invention is a drive transmission device that transmits a driving force from a drive source to a rotating body at a predetermined timing, and is rotatably inserted into a predetermined first shaft, A first input gear to which a driving force from a source is input, a second input gear rotatably inserted into the first shaft and engageable with the first input gear, and meshable with the second input gear A first chipped gear having a chipped portion, a second chipped gear disposed coaxially with the first chipped gear and having a chipped portion, and a second parallel to the first shaft. A first output gear that is rotatably inserted into the shaft and is capable of meshing with the second chipped gear; and is rotatably inserted into the second shaft and engageable with the first output gear; The driving force from the first output gear is output to the rotating body. It includes a second output gear, a. The first output gear and the second output gear are arranged such that an inner output gear adjacent to the second shaft has a clearance larger than a predetermined sliding clearance between the second output gear and the second shaft. And are engaged with each other with a predetermined output rotational clearance in the rotational direction.

  According to this drive transmission device, a first chipped gear and a second chipped gear arranged coaxially with the first chipped gear are provided. The first chipped gear can mesh with a second input gear that is engaged with a first input gear that is rotatable relative to the first shaft by a driving force from a driving source. Further, the second chipped gear can be engaged with a first output gear that is rotatably inserted into the second shaft, and a driving force is output from the second output gear that can be engaged with the first output gear. . In the drive transmission device having such a configuration, the second chipped gear rotates as the first chipped gear that meshes with the second input gear rotates, and the most downstream tooth in the rotation direction of the second chipped gear. When the portion reaches the tooth portion of the first output gear, the rotation of the first output gear is started, and the driving force is output to the rotating body by the rotation of the second output gear that can be engaged with the first output gear. .

  Conventionally, in a gear that is rotatably inserted into a shaft, the gear and the shaft are arranged so that the radial displacement of the gear during rotation is minimized while maintaining the rotational sliding characteristics of the gear with respect to the outer peripheral surface of the shaft. The sliding clearance is set. That is, when the clearance between the gear and the shaft is set to a predetermined sliding clearance, the gear is not allowed to be displaced in the radial direction. In such a configuration, the impact force when the tooth portion of the chipped gear rotating at a constant speed collides with the tooth portion of the stationary gear becomes large.

  Therefore, in the drive transmission device according to the present invention, the first output gear and the second output gear have a clearance larger than a predetermined sliding clearance between the inner output gear close to the second shaft and the second shaft. Are arranged. With this configuration, when the tooth portion of the second chipped gear that rotates at a constant speed collides with the tooth portion of the stationary first output gear, the first output gear and the first output gear Displacement in the radial direction of the second output gear engaged with the output gear is allowed. Thereby, the impact force when the tooth part of the second chipped gear collides with the tooth part of the first output gear can be reduced. Therefore, it is possible to suppress the generation of impact sound and vibration.

  In the drive transmission device according to the present invention, the first output gear and the second output gear are engaged with each other with a predetermined output rotation clearance in the rotation direction. In such a configuration, the second output gear rotates when the first output gear meshed with the second chipped gear rotates within the range of the output rotation clearance and engages with the first output gear. That is, when the tooth portion of the second chipped gear collides with the tooth portion of the first output gear and the rotation of the first output gear is started, the rotation of the second output gear is engaged with the first output gear. There is a time difference from the point in time when is started. Therefore, the impact force when the tooth portion of the second chipped gear collides with the tooth portion of the first output gear is directly transmitted to the second output gear for outputting the driving force to the rotating body. Is prevented.

  In the drive transmission device, the first input gear and the second input gear may be engaged with each other with a predetermined input rotation clearance in the rotation direction.

  In this aspect, the second input gear that can mesh with the first chipped gear is engaged with the first input gear when the first input gear rotates within the range of the input rotation clearance by the input of the driving force from the driving source. Then, it will rotate. That is, there is a time difference between the time when the driving force from the drive source is input to the first input gear and the time when the rotation of the second input gear is started by engaging with the first input gear. Therefore, the driving force from the driving source is prevented from being input to the first input gear and transmitted to the second input gear meshed with the first chipped gear. Thereby, the impact force when the driving force is transmitted from the first input gear to the second input gear meshed with the first chipped gear can be reduced.

  The drive transmission device is fixed to the first chipped gear and has a first cam member having a locking portion, and is locked to the locking portion of the first cam member. It is good also as a structure further provided with the solenoid which controls rotation of one chipped gear.

  In this aspect, when the restriction by the solenoid is released, the first chipped gear can be rotated, and the second chipped gear arranged coaxially with the first chipped gear can also be rotated. can do.

  The drive transmission device is configured to release the first chipped gear and the first gear when the second cam member fixed to the second chipped gear and the locking portion by the solenoid are released. It is good also as a structure further provided with the urging member which urges | biases the said 2nd cam member so that 2 chipped gears may rotate.

  In this aspect, in the period when the driving force from the driving source is not input to the first chipped gear through the first input gear and the second input gear, the first chipped gear and the first gear are driven by the biasing force of the biasing member. 2 The chipped gear can be rotated.

  An image forming apparatus according to another aspect of the present invention includes a rotating body, an image forming system for forming an image on a sheet, a driving source that generates a driving force for driving the rotating body, A drive transmission device configured to transmit a driving force generated by a drive source to the rotating body.

  According to this image forming apparatus, when the driving force from the driving source is transmitted to the rotating body at a predetermined timing, the generation of impact sound and vibration is suppressed, so that it is possible to prevent the user from feeling uncomfortable, In addition, it is possible to suppress the occurrence of streak-like image defects in the image formed on the sheet.

  In the above image forming apparatus, the image forming system includes an image carrier having a peripheral surface for supporting a developer image, a developing unit that supplies a developer to the peripheral surface of the image carrier, and a developing unit that develops the image. A developer replenishing unit that replenishes the developer, and includes a replenishing unit main body that stores the developer, and a developer replenishing unit that is disposed in the replenishing unit main body and includes a transport feeder that transports the developer. The rotating body is the transport feeder.

  In this aspect, the conveyance feeder of the developer supply unit can be driven by the driving force transmitted by the drive transmission device.

  As described above, according to the present invention, in the drive transmission device that transmits the driving force from the drive source to the rotating body at a predetermined timing, the drive transmission device that can suppress the generation of impact sound and vibration, and An image forming apparatus provided with this can be provided.

1 is a diagram illustrating an internal structure of an image forming apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a relationship between a gear train and a drive transmission device in a drive transmission system of the image forming apparatus. It is a perspective view which shows the structure of a drive transmission device. It is a top view which shows the structure of a drive transmission device. It is a disassembled perspective view which shows the structure of a drive transmission device. It is a perspective view which shows the structure of the drive input part in a drive transmission apparatus. It is a top view which shows the structure of the drive input part in a drive transmission apparatus. It is sectional drawing which shows the structure of the drive input part in a drive transmission apparatus. It is a top view which shows the structure of the drive output part in a drive transmission apparatus. It is sectional drawing which shows the structure of the drive output part in a drive transmission apparatus. It is a perspective view which shows the structure of the chipped gear part in a drive transmission device. It is a disassembled perspective view which shows the structure of the chipped gear part in a drive transmission device. It is sectional drawing which shows the structure of the chipped gear part in a drive transmission device. It is an exploded sectional view showing the composition of the chipped gear part in a drive transmission device. It is a top view which shows the structure of the chipped gear part in a drive transmission device. It is a figure for demonstrating operation | movement of a drive transmission apparatus. It is a figure for demonstrating operation | movement of a drive transmission apparatus. It is a figure for demonstrating operation | movement of a drive transmission apparatus. It is a top view which shows the vicinity of the solenoid in a drive transmission apparatus. It is a figure for demonstrating operation | movement of the solenoid in a drive transmission apparatus. It is a top view which expands and shows the vicinity of the solenoid in a drive transmission apparatus. It is a figure for demonstrating the function of the rotation control member with respect to operation | movement of the solenoid in a drive transmission apparatus. It is a figure for demonstrating the function of the rotation control member with respect to operation | movement of the solenoid in a drive transmission apparatus. It is a figure for demonstrating the function of the rotation control member with respect to operation | movement of the solenoid in a drive transmission apparatus.

  Hereinafter, a drive transmission device and an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an internal structure of an image forming apparatus 1 according to an embodiment of the present invention. Although the image forming apparatus 1 is a full-color printer, in other embodiments, the image forming apparatus 1 may be a full-color copying machine, a facsimile machine, a multifunction machine having these functions, or the like.

  Note that the terms used in the following description, such as “up”, “down”, “front”, “rear”, “left” and “right”, are merely for the purpose of clarifying the description. There is no limitation on the principle of the image forming apparatus 1. In the following description, the term “sheet” means copy paper, coated paper, OHP sheet, cardboard, postcard, tracing paper, other sheet material subjected to image forming processing, or any processing other than image forming processing. Means the sheet material to receive.

  The image forming apparatus 1 includes a main body housing 10 which is a box-shaped apparatus main body that houses various apparatuses for forming an image on a sheet. The front, rear, left, and right side surfaces of the main body housing 10 are covered with a front side plate 101, a left side plate, a right side plate, and a rear side plate 104 that also serve as exteriors. The upper surface of the main body housing 10 is covered with a top plate 105. A bulging portion 106 having a paper discharge port 17H is provided on the rear side of the top plate 105, and a paper discharge tray 107 for receiving sheets discharged from the paper discharge port 17H is provided on the front side. A paper feed cassette 11 is detachably mounted on the bottom of the main body housing 10. Further, a paper feeding device 12 is added below the paper feeding cassette 11.

  The image forming apparatus 1 includes a paper feeding cassette 11 as a paper feeding unit, a paper feeding device 12, a manual feed tray 13, an image forming unit 2 (image forming system) for forming a toner image (developer image), and an intermediate transfer unit. 3, a fixing unit 4, and a sheet conveyance system that includes the sheet feeding unit and the sheet discharge tray 107 and conveys a sheet within the main body housing 10.

  The paper feed cassette 11 accommodates a bundle of sheets S onto which toner images are transferred. The sheet feeding cassette 11 includes a sheet storage unit 111 that stores the bundle of sheets S, a lift plate 112 on which the bundle of sheets S is placed, and the uppermost sheet of the bundle of sheets S through the main transport path P1. And a paper feed roller 113 that feeds the paper. The sheet feeding device 12 is an optional sheet feeding unit that is attached to the bottom of the main body housing 10, and similarly includes a sheet storage unit 121, a lift plate 122, and a sheet feeding roller 123. The sheet feeding device 12 includes a communication conveyance path P4 through which a sheet fed by the sheet feeding roller 123 passes, and a feeding roller 124 is disposed at the downstream end thereof. The manual feed tray 13 is a tray on which a manual feed sheet is placed. Near the manual feed tray 13, a nip roller 131 for taking in the manual feed sheet and a manual feed roller 132 for feeding the manual feed sheet to the manual feed path PM are arranged. A plurality of transport rollers 133 are arranged along the manual transport path PM.

  The image forming unit 2 includes four image forming units that respectively form toner images of respective colors of yellow (Y), cyan (C), magenta (M), and black (Bk). That is, the image forming unit 2 forms an image forming unit 2Y for forming a yellow toner image, an image forming unit 2C for forming a cyan toner image, and a magenta toner image. An image forming unit 2M for forming a black toner image, and an image forming unit 2Bk for forming a black toner image.

  Each of the image forming units 2Y, 2C, 2M, and 2Bk includes a photosensitive drum 21 (image carrier), a charging unit 22, a developing unit 23, a primary transfer roller 24, and a cleaning unit 25. Further, the image forming unit 2 includes an optical scanning unit 26 that is commonly used in the four color image forming units.

  The photosensitive drum 21 is a cylindrical member, and carries an electrostatic latent image and a toner image (developer image) on its peripheral surface. The photosensitive drum 21 includes a drum rotation shaft extending in the left-right direction, and is driven to rotate around the drum rotation shaft. The charging unit 22 charges the peripheral surface of the photosensitive drum 21 substantially uniformly. The optical scanning unit 26 includes a light source that emits laser light for scanning, a polygon mirror for deflection, and an imaging optical system. The optical scanning unit 26 irradiates the peripheral surface of the photosensitive drum 21 that is substantially uniformly charged with laser light corresponding to the image data to form an electrostatic latent image.

  The developing unit 23 develops and exposes the electrostatic latent image, and includes a developing roller 231 that supplies toner (developer) to the peripheral surface of the photosensitive drum 21 on which the electrostatic latent image is formed. The developing roller 231 includes a roller rotation shaft extending in the left-right direction, and is driven to rotate around the roller rotation shaft. By supplying toner from the developing unit 23, a toner image is formed on the peripheral surface of the photosensitive drum 21.

  The primary transfer roller 24 is disposed so as to face the photosensitive drum 21 from above, and a transfer nip portion is formed by sandwiching an intermediate transfer belt 31 described later. The primary transfer roller 24 is given a transfer bias for transferring the toner image carried on the photosensitive drum 21 onto the intermediate transfer belt 31. The cleaning unit 25 removes the toner remaining on the peripheral surface of the photosensitive drum 21 after the toner image is transferred to the sheet S.

  The image forming apparatus 1 further includes a toner container 27 (developer supply unit) that supplies toner to the developing unit 23 as a part of the image forming unit 2. In FIG. 3, only the toner container 27 for the image forming unit 2Y is shown, and illustrations for other colors are omitted. The toner container 27 includes a container main body 27H (replenisher main body) that stores toner of each color, and a transport feeder 271 that is disposed inside the container main body 27H and transports the stored toner toward a toner discharge port (not shown). Yes. The transport feeder 271 includes a rotating shaft extending in the left-right direction and a spiral piece provided on the periphery of the rotating shaft, and is driven to rotate about the rotating shaft.

  The intermediate transfer unit 3 is disposed above the image forming unit 2, and an intermediate transfer belt 31 on which a toner image carried on the peripheral surface of the photosensitive drum 21 is primarily transferred, and a belt drive that drives the intermediate transfer belt 31 to rotate. A roller 32 and a tension roller 33. The intermediate transfer belt 31 is an endless belt and has an outer peripheral surface to which the toner image is primarily transferred. The intermediate transfer belt 31 is stretched between a belt driving roller 32 and a tension roller 33, and travels around when the belt driving roller 32 is rotationally driven. The secondary transfer roller 15 is pressed against the belt driving roller 32 via the intermediate transfer belt 31 to form a secondary transfer portion.

  The fixing unit 4 includes a fixing roller 41 having a built-in heat source, and a pressure roller 42 that forms a fixing nip portion together with the fixing roller 41. Each of the fixing roller 41 and the pressure roller 42 includes a rotation shaft extending in the left-right direction, and is driven to rotate around the rotation shaft. The fixing unit 4 performs a fixing process for fusing the toner to the sheet by conveying the sheet on which the toner image has been transferred in the secondary transfer unit while heating and pressing the sheet in the fixing nip unit.

  The image forming apparatus 1 includes the above-described paper feeding cassette 11, paper feeding device 12, and manual feed tray 13 as a sheet conveying system, a paper feeding unit that feeds a sheet on which a toner image is secondarily transferred, and a secondary transfer. The sheet discharge tray 107 that receives a subsequent sheet, various sheet conveyance paths, and sheet conveyance rollers arranged in these sheet conveyance paths are included.

  The sheet conveyance path includes a main conveyance path P1, a reverse conveyance path P2, communication conveyance paths P3 and P4, and the manual conveyance path PM described above. The main conveyance path P1 extends substantially in the vertical direction, and conveys the sheet from the sheet feeding unit to the sheet discharge tray 107 via the intermediate transfer unit 3 (secondary transfer unit) and the fixing unit 4 (fixing nip unit). Road. The reverse conveyance path P2 is a conveyance path that reversely conveys the sheet from the vicinity of the downstream end of the main conveyance path P1 to the vicinity of the upstream end when double-sided printing is performed on the sheet. The communication conveyance path P3 on the main body housing 10 side and the communication conveyance path P4 on the paper feeding device 12 side are conveyance paths that communicate with each other when the paper feeding device 12 is mounted on the main body housing 10. The downstream end of the communication transport path P3 and the downstream end of the manual transport path PM are connected to the vicinity of the upstream end of the main transport path P1.

  As the sheet conveying rollers, in addition to the paper feeding rollers 113, 123, 132, the feeding roller 124, and the conveying roller 133 described above, in the present embodiment, the registration roller 14 and the secondary transfer roller 15 arranged in the main conveying path P1. , A conveyance roller 16 and a paper discharge roller 17 at the fixing exit, and reverse conveyance rollers 181 and 182 arranged in the reverse conveyance path P2.

  The registration roller 14 is disposed on the upstream side of the secondary transfer portion in the main transport path P1. The registration roller 14 temporarily waits the sheet and then supplies the sheet to the secondary transfer unit at a predetermined timing. The secondary transfer roller 15 is disposed opposite to the belt driving roller 32 with the intermediate transfer belt 31 interposed therebetween, and forms the secondary transfer portion. The sheet passing through the secondary transfer portion is conveyed downstream while in contact with the secondary transfer roller 15 and the intermediate transfer belt 31.

  The transport roller 16 is a roller that transports the sheet that has passed through the fixing unit 4 toward the paper discharge port 17H. The paper discharge roller 17 is a roller that discharges the sheet subjected to the secondary transfer and the fixing process from the main transport path P1 to the paper discharge tray 107 through the paper discharge port 17H. The reverse conveyance rollers 181 and 182 are rollers that reversely convey the sheet in the reverse conveyance path P2. Note that the pair of the fixing roller 41 and the pressure roller 42 also plays a role of sheet conveyance in the main conveyance path P1.

  As described above, the image forming apparatus 1 includes the photosensitive drum 21 included in the image forming unit 2, the transport roller 271 of the developing roller 231 and the toner container 27, the belt driving roller 32 included in the intermediate transfer unit 3, and the fixing roller of the fixing unit 4. 41, a pressure roller 42, and a group of conveying rollers included in the sheet conveying system. The image forming apparatus 1 of the present embodiment is transmitted by a drive motor as a drive source for driving these rotating bodies, a drive transmission system that forms a transmission path of a driving force generated by the drive motor, and the drive transmission system. And a drive transmission device for transmitting a driving force to the rotating body.

  With reference to FIG. 2, the drive transmission system and the drive transmission device included in the image forming apparatus 1 will be described. FIG. 2 is a diagram illustrating a relationship between the gear train and the drive transmission device 6 in the drive transmission system 5 of the image forming apparatus 1. The drive transmission device 6 of this embodiment is a device for transmitting the driving force from the drive motor to the rotating body at a predetermined timing. The rotating body to which the driving force is transmitted in the drive transmission device 6 is not particularly limited as long as it is the above-described rotating body included in the image forming apparatus 1. Hereinafter, an example in which the driving force transmission target rotating body in the drive transmission device 6 is the transport feeder 271 of the toner container 27 will be described.

  As shown in FIG. 2, the drive transmission system 5 and the drive transmission device 6 are disposed in the main body housing 10. The image forming apparatus 1 includes four drive transmission devices 6 corresponding to the four toner containers 27 that store toner of each color of yellow (Y), cyan (C), magenta (M), and black (Bk), respectively. I have. The four drive transmission devices 6 are configured identically. The drive transmission system 5 forms a drive transmission path for transmitting the driving force from the motor output shaft MS of the drive motor to the four drive transmission devices 6.

  The drive transmission system 5 includes a plurality of drive transmission gears. In the example shown in FIG. 2, the drive transmission system 5 includes a first drive transmission gear 5A, a second drive transmission gear 5B, a third drive transmission gear 5C, a fourth drive transmission gear 5D, a fifth drive transmission gear 5E, Drive transmission gear 5F, seventh drive transmission gear 5G, eighth drive transmission gear 5H, ninth drive transmission gear 5I, tenth drive transmission gear 5J, eleventh drive transmission gear 5Ka, twelfth drive transmission gear 5L, thirteenth drive It includes a transmission gear 5M, a fourteenth drive transmission gear 5N, and a fifteenth drive transmission gear 5Kb.

  The first drive transmission gear 5A is meshed with the motor output shaft MS of the drive motor and directly receives the driving force from the motor output shaft MS. The driving force from the motor output shaft MS received by the first drive transmission gear 5A is the second drive transmission gear 5B, the third drive transmission gear 5C, the fourth drive transmission gear 5D, the fifth drive transmission gear 5E, and the sixth drive. Transmission gear 5F, seventh drive transmission gear 5G, eighth drive transmission gear 5H, ninth drive transmission gear 5I, tenth drive transmission gear 5J, eleventh drive transmission gear 5Ka, twelfth drive transmission gear 5L, thirteenth drive transmission Transmission is performed in the order of the gear 5M, the fourteenth drive transmission gear 5N, and the fifteenth drive transmission gear 5Kb.

  Of the drive transmission gears constituting the drive transmission system 5, the eleventh drive transmission gear 5Ka includes a drive transmission device 6 provided corresponding to the toner container 27 for storing magenta toner, and a black toner. The driving force from the motor output shaft MS is transmitted to the drive transmission device 6 provided corresponding to the toner container 27 that stores the toner. Of the above-described drive transmission gears constituting the drive transmission system 5, the fifteenth drive transmission gear 5Kb includes the drive transmission device 6 provided corresponding to the toner container 27 that stores yellow toner, and the cyan color. The drive force from the motor output shaft MS is transmitted to the drive transmission device 6 provided corresponding to the toner container 27 that stores the toner.

  The drive transmission device 6 transmits the driving force from the motor output shaft MS transmitted by the drive transmission system 5 to the transport feeder 271 of the toner container 27. The drive transmission device 6 transmits a driving force to the transport feeder 271 at a predetermined timing when toner replenishment is required for the developing unit 23. The details of the drive transmission device 6 will be described with reference to FIGS. 3 is a perspective view showing the configuration of the drive transmission device 6, FIG. 4 is a plan view, and FIG. 5 is an exploded perspective view. The drive transmission device 6 includes a drive input unit 61, a chipped gear unit 62, and a drive output unit 63.

  The drive input unit 61 is a part in the drive transmission device 6 where the drive force from the motor output shaft MS of the drive motor is input via the drive transmission system 5. 6 is a perspective view showing the configuration of the drive input unit 61 in the drive transmission device 6, FIG. 7 is a plan view, and FIG. 8 is a cross-sectional view. The drive input unit 61 includes a first input gear 611 and a second input gear 612.

  In the drive input unit 61, the first input gear 611 is meshed with the eleventh drive transmission gear 5Ka or the fifteenth drive transmission gear 5Kb of the drive transmission system 5, and the driving force from the motor output shaft MS of the drive motor is input. It is a gear. The first input gear 611 is rotatably inserted through a first shaft 613 extending in the left-right direction. As shown in FIGS. 5 to 7, the first input gear 611 is formed with a drive input engagement hole 611a that is a hole extending in the circumferential direction (rotation direction). In the present embodiment, the first input gear 611 is formed with two drive input engagement holes 611a.

  In the drive input unit 61, the second input gear 612 is a gear that is rotatably inserted into the first shaft 613 and can be engaged with the first input gear 611. The second input gear 612 can mesh with a first chipped gear 621 of a chipped gear portion 62 described later. As shown in FIGS. 5 to 7, the second input gear 612 is formed with a first shaft insertion hole 612 b through which the first shaft 613 is inserted at the center. Further, the second input gear 612 has a drive input engagement protrusion 612a that protrudes in the axial direction (left and right direction orthogonal to the radial direction) and extends in the circumferential direction (rotation direction). It is formed along the portion 612b. In the present embodiment, the second input gear 612 is formed with two drive input engagement protrusions 612 a corresponding to the drive input engagement holes 611 a of the first input gear 611. The second input gear 612 is inserted through the first shaft 613 so that the drive input engagement protrusion 612a is inserted into the drive input engagement hole 611a.

  As shown in FIG. 7, in the drive input unit 61, the first input gear 611 and the second input gear 612 are engaged with each other with a predetermined input rotation clearance 61A in the rotation direction. Specifically, the circumferential length of the drive input engagement hole 611a of the first input gear 611 is set to be longer than the circumferential length of the drive input engagement protrusion 612a of the second input gear 612. ing. In the state where the drive input engagement protrusion 612a is inserted into the drive input engagement hole 611a, the clearance area where the drive input engagement protrusion 612a is not disposed in the drive input engagement hole 611a is input rotation. Clearance 61A is obtained.

  In the drive input portion 61 having the above-described configuration, the first input gear 611 rotates within the range of the input rotation clearance 61A by the input of the drive force from the motor output shaft MS, and the upstream edge in the rotation direction of the drive input engagement hole portion 611a. Is in contact with and engaged with the upstream end of the drive input engagement protrusion 612a in the rotation direction, the second input gear 612 rotates in conjunction with the rotation of the first input gear 611. That is, there is a time difference between when the driving force from the motor output shaft MS is input to the first input gear 611 and when the rotation of the second input gear 612 is started by engaging the first input gear 611. Have. Accordingly, the driving force from the motor output shaft MS is prevented from being transmitted to the second input gear 612 meshed with the first chipped gear 621 at the same time as being input to the first input gear 611. Thereby, the impact force when the driving force is transmitted from the first input gear 611 to the second input gear 612 meshed with the first chipped gear 621 can be reduced.

  In the drive transmission device 6, the chipped gear portion 62 is a portion to which the driving force from the motor output shaft MS is transmitted from the drive input portion 61. As shown in FIGS. 3 to 5, the chipped gear portion 62 is provided so as to be able to mesh with the second input gear 612, and is coaxial with the first chipped gear 621 having the chipped portion and the first chipped gear 621. And a second chipped gear 622 having a chipped portion. Details of the configuration of the chipped gear portion 62 will be described later.

  In the drive transmission device 6, the drive output unit 63 is a portion to which the drive force is transmitted from the chipped gear portion 62, and outputs the transmitted drive force to the transport feeder 271 of the toner container 27. 9 is a plan view showing the configuration of the drive output unit 63 in the drive transmission device 6, and FIG. 10 is a cross-sectional view. The drive output unit 63 includes a first output gear 631 and a second output gear 632.

  In the drive output unit 63, the first output gear 631 is a gear that can be engaged with the second chipped gear 622, and the driving force is transmitted from the second chipped gear 622. The first output gear 631 is rotatably inserted through a second shaft 633 extending in the left-right direction parallel to the first shaft 613. As shown in FIGS. 5 and 9, the first output gear 631 is formed with a second shaft insertion hole 631 b through which the second shaft 633 is inserted at the center. Further, the first output gear 631 is formed with a drive output engagement hole 631a that is a hole extending in the circumferential direction (rotation direction) along the second shaft insertion hole 631b. In the present embodiment, the first output gear 631 is formed with two drive output engagement holes 631a.

  In the drive output unit 63, the second output gear 632 is a gear that is rotatably inserted into the second shaft 633 and can engage with the first output gear 631. The second output gear 632 receives the driving force from the first output gear 631 and outputs the transmitted driving force to the transport feeder 271 of the toner container 27. As shown in FIGS. 5 and 9, the second output gear 632 has a drive output engagement protrusion that is a protrusion that protrudes in the axial direction (left-right direction orthogonal to the radial direction) and extends in the circumferential direction (rotation direction). 632a is formed. In the present embodiment, two drive output engagement protrusions 632 a are formed in the second output gear 632 corresponding to the drive output engagement hole 631 a of the first output gear 631. The second output gear 632 is inserted through the second shaft 633 so that the drive output engagement protrusion 632a is inserted into the drive output engagement hole 631a.

  As shown in FIG. 9, in the drive output unit 63, the first output gear 631 and the second output gear 632 are engaged with each other with a predetermined output rotation clearance 63A in the rotation direction. Specifically, the circumferential length of the drive output engagement hole 631a of the first output gear 631 is set to be longer than the circumferential length of the drive output engagement protrusion 632a of the second output gear 632. ing. In the state where the drive output engagement protrusion 632a is inserted into the drive output engagement hole 631a, the gap region where the drive output engagement protrusion 632a is not disposed in the drive output engagement hole 631a is output rotation. Clearance 63A.

  In the drive output portion 63 configured as described above, the first output gear 631 rotates within the range of the output rotation clearance 63A due to transmission of the drive force from the second chipped gear 622, and the drive output engagement hole 631a is upstream in the rotation direction. When the end edge comes into contact with and engages with the upstream end of the drive output engagement protrusion 632a in the rotation direction, the second output gear 632 rotates in conjunction with the rotation of the first output gear 631. That is, when the tooth portion of the second chipped gear 622 collides with the tooth portion of the first output gear 631 and the rotation of the first output gear 631 is started, the second output gear 631 is engaged with the second gear. There is a time difference from the time when the rotation of the output gear 632 is started. Therefore, the impact force generated when the tooth portion of the second chipped gear 622 collides with the tooth portion of the first output gear 631 is applied to the second output gear 632 for outputting the driving force to the conveyance feeder 271 of the toner container 27. , Is prevented from being transmitted directly.

  Furthermore, as shown in FIG. 10, in the drive output unit 63, the first output gear 631 and the second output gear 632 are predetermined between the second output shaft 633 and the inner output gear close to the second shaft 633. The clearance 63B is larger than the sliding clearance (hereinafter referred to as “radial clearance 63B”). In the present embodiment, of the first output gear 631 and the second output gear 632, the inner output gear close to the second shaft 633 is the second output gear 632.

  Conventionally, in a gear that is rotatably inserted into a shaft, the gear and the shaft are arranged so that the radial displacement of the gear during rotation is minimized while maintaining the rotational sliding characteristics of the gear with respect to the outer peripheral surface of the shaft. The sliding clearance is set. For example, a sliding clearance of 0.05 mm is generally set for a shaft having an outer diameter of 6 mm. When the clearance between the gear and the shaft is set to a predetermined sliding clearance, the gear is not allowed to be displaced in the radial direction. In such a configuration, the impact force when the tooth portion of the chipped gear rotating at a constant speed collides with the tooth portion of the stationary gear becomes large.

  Therefore, in the drive transmission device 6 of the present embodiment, the first output gear 631 and the second output gear 632 are the same as the second output shaft 633 and the inner output gear (second output gear 632) close to the second shaft 633. Are disposed with a radial clearance 63B larger than a predetermined sliding clearance. For example, a radial clearance 63B of 0.25 mm is set for the second shaft 633 having an outer diameter of 6 mm. As the upper limit value of the radial clearance 63B, a value that does not deteriorate the meshing performance between the first output gear 631 and the second chipped gear 622 is selected. For example, the tooth depth of the tooth portion of the first output gear 631 ( Tooth height). With this configuration, when the tooth portion of the second chipped gear 622 rotating at a constant speed collides with the tooth portion of the first output gear 631 that is stationary, the first output gear 631 and The second output gear 632 engaged with the first output gear 631 is allowed to be displaced in the radial direction. Thereby, the impact force when the tooth part of the second chipped gear 622 collides with the tooth part of the first output gear 631 can be reduced. Therefore, it is possible to suppress the generation of impact sound and vibration.

  In the present embodiment, as shown in FIG. 9, the drive output engagement protrusion 632 a of the second output gear 632 is inserted into the drive output engagement hole 631 a of the first output gear 631. The urging spring member 68 is disposed in a gap area where the drive output engagement protrusion 632a is not disposed in the engagement hole 631a. One end of the biasing spring member 68 is connected to the upstream end edge in the rotational direction of one drive output engagement hole 631a, and the other end is the upstream end in the rotational direction of one drive output engagement protrusion 632a. This is a spring member that is connected to the portion and biases the second output gear 632 in the rotational direction. In the drive transmission device 6, the first output gear 631 meshes with the second chipped gear 622 and rotates, and the second output gear 632 engaged with the first output gear 631 rotates, whereby the second output gear. When the transmission of the driving force from 632 to the conveyance feeder 271 is completed, the second output gear 632 is rotated by the urging force of the urging spring member 68. Accordingly, the first output gear 631 and the second output gear are set such that the rotational movement distance of the first output gear 631 until the first output gear 631 engages with the second output gear 632 coincides with the output rotation clearance 63A. 632 can be arranged.

  Further, as shown in FIGS. 3A, 4 </ b> A, and 5, the drive transmission device 6 is disposed coaxially with the first chipped gear 621 and is fixed to the first chipped gear 621. An annular first cam member 64 is provided. The first cam member 64 has a locking portion 641. Further, the drive transmission device 6 includes a solenoid 65. The solenoid 65 includes a flapper 651 that can be turned by energization. In the solenoid 65, the flapper 651 has its tip claw portion 651a locked to the locking portion 641 of the first cam member 64, and restricts the rotation of the first chipped gear 621 at a predetermined timing. In the drive transmission device 6 including the solenoid 65, the first gap tooth is obtained by releasing the locking between the flapper 651 and the locking portion 641 of the first cam member 64 by turning the flapper 651 by energization. The gear 621 can be rotated, and the second chipped gear 622 arranged coaxially with the first chipped gear 621 can also be rotated. Details of the configuration of the solenoid 65 will be described later.

  Further, as shown in FIGS. 3B and 4B, the drive transmission device 6 is arranged on the same axis as the second chipped gear 622 and is fixed to the second chipped gear 622. The second cam member 66 is provided. Further, the drive transmission device 6 includes a rotation biasing arm 67 (biasing member). The rotation urging arm 67 has a second cam member so that the first chipped gear 621 and the second chipped gear 622 rotate when the locking of the locking portion 641 by the solenoid 65 is released. 66 is activated. The rotation urging arm 67 includes a protrusion 671 that comes into contact with the peripheral surface (cam surface) of the second cam member 66. The rotation urging arm 67 is rotatable so that the projection 671 moves along the cam surface of the second cam member 66 in accordance with the rotation of the second chipped gear 622.

  In the drive transmission device 6 including the rotation urging arm 67, a period in which the driving force from the motor output shaft MS is not input to the first missing gear 621 via the first input gear 611 and the second input gear 612. The first chipped gear 621 and the second chipped gear 622 can be rotated by the biasing force of the pivot biasing arm 67.

  Next, details of the configuration of the chipped gear portion 62 provided in the drive transmission device 6 will be described with reference to FIGS. 11 to 15. 11 is a perspective view showing a configuration of the chipped gear portion 62 in the drive transmission device 6, FIG. 12 is an exploded perspective view, FIG. 13 is a sectional view, FIG. 14 is an exploded sectional view, and FIG. Is a plan view. FIG. 15 is a plan view seen from the second chipped gear 622 side with the second cam member 66 removed.

  As described above, the chipped gear portion 62 is disposed on the same axis as the first chipped gear 621 that can be meshed with the second input gear 612, and is arranged coaxially with the first chipped gear 621. And a second chipped gear 622 provided so as to be able to mesh with each other. The first missing tooth gear 621 has a missing tooth portion 621a in which no tooth portion exists in a constant region in the circumferential direction (rotational direction). Similarly, the second missing tooth gear 622 has a missing tooth portion 622a having no tooth portion in a constant region in the circumferential direction (rotating direction).

  As shown in FIG. 11, in the present embodiment, in the missing tooth gear portion 62, the tooth portion 621 b at the most downstream side in the rotation direction of the first missing tooth gear 621 is the tooth portion at the most downstream side in the rotation direction of the second missing tooth gear 622. It arrange | positions rather than 622b in the rotation direction upstream. As described above, the drive transmission device 6 is provided with a rotation during a period in which the driving force from the motor output shaft MS is not input to the first chipped gear 621 via the first input gear 611 and the second input gear 612. The first chipped gear 621 and the second chipped gear 622 are rotated by the biasing force of the biasing arm 67.

  In the drive transmission device 6 having such a rotation urging arm 67, the tooth portion 621 b in the rotation direction downstream side of the first chipped gear 621 is the tooth portion 622 b in the rotation direction downstream side of the second chipped gear 622. The second chipped gear 621 and the second chipped gear 622 are rotated by the urging force of the rotation urging arm 67 by being arranged on the upstream side of the rotation direction. The first chipped gear 621 can be engaged with the second input gear 612 while the tooth gear 622 is not meshed with the first output gear 631. The driving force from the motor output shaft MS is input to the first input gear 611 by rotating the first chipped gear 621 in mesh with the second input gear 612 by the urging force of the rotation urging arm 67. Before, the first input gear 611 and the second input gear are set such that the rotational movement distance of the first input gear 611 until the first input gear 611 engages with the second input gear 612 matches the input rotation clearance 61A. 612 can be arranged.

  As shown in FIGS. 12 and 15, the first chipped gear 621 is an annular chipped gear that is rotatably inserted into the chipped gear shaft 623 and protrudes outward in the radial direction. It has the 1st fitting protrusion 621c. In the present embodiment, as shown in FIG. 15, the first chipped gear 621 has four first fitting protrusions 621c that are arranged at equal intervals in the circumferential direction.

  The second chipped gear 622 is an annular chipped gear that is rotatably inserted into the chipped gear shaft 623 and has a second fitting protrusion 622d that protrudes radially inward. In this embodiment, as shown in FIGS. 12 and 15, the second chipped gear 622 has four second fitting protrusions 622d arranged at equal intervals in the circumferential direction. Four fitting grooves 622c are formed between the fitting protrusions 622d.

  The first chipped gear 621 and the second chipped gear 622 are inserted into the chipped gear shaft 623 so that the first fitting protrusion 621c of the first chipped gear 621 is the second chipped tooth. The gear 622 is fitted into the fitting groove 622c. In the first chipped gear 621 and the second chipped gear 622 configured as described above, the downstream end of the first fitting projection 621c in the rotational direction and the upstream end of the second fitting projection 622d in the rotational direction. Torque is transmitted at the contact position.

  As shown in FIG. 12, the second chipped gear 622 is disposed between the first chipped gear 621 and the second cam member 66, and movement in the axial direction is restricted by the second cam member 66. Yes. In other words, the second cam member 66 has a function as a clamping member that clamps the second chipped gear 622 in cooperation with the first chipped gear 621.

  Referring to FIG. 12, the second cam member 66 is formed in a substantially cylindrical shape through which the chipped gear shaft 623 can be inserted, and includes an insertion tube portion 661, a cam portion 662, and an extension portion 663. Including. The insertion tube portion 661 is a portion through which the chipped gear shaft 623 of the second cam member 66 is inserted. The cam portion 662 forms a cam surface with which the protruding portion 671 of the rotation urging arm 67 contacts, and is a portion having a cam shape in the second cam member 66. The rotation urging arm 67 is configured to urge the cam portion 662 of the second cam member 66. The extending portion 663 is disposed between the insertion tube portion 661 and the cam portion 662, and is provided to extend radially outward from the outer peripheral surfaces of the insertion tube portion 661 and the cam portion 662. The extending portion 663 is a portion that functions to restrict the movement of the second chipped gear 622 in the axial direction in the second cam member 66.

  Furthermore, in the drive transmission device 6 of the present embodiment, the second chipped gear 622 is made of an elastomer material having shock absorption. Thereby, the impact force when the tooth part of the second chipped gear 622 that rotates at a constant speed collides with the tooth part of the stationary first output gear 631 can be more reliably reduced. Therefore, it is possible to more reliably suppress the generation of impact sound and vibration.

  Here, as a configuration for reducing the impact force at the start of meshing between the second chipped gear 622 and the first output gear 631, only the tooth portion 622b at the most downstream side in the rotation direction of the second chipped gear 622 is shock-absorbing. The structure which makes the elastomer material which has this, and the structure which deform | transforms the tooth | gear part of the fixed range of the rotation direction downstream in the 2nd chipped gear 622 can be considered. However, if only some of the teeth in the second chipped gear 622 are made of a different material, the pitch stability between adjacent teeth will be reduced. Further, if a part of the tooth portion of the second chipped gear 622 is deformed, the meshing performance with the first output gear 631 is reduced, or a torque cross occurs.

  Therefore, the second chipped gear 622 is entirely made of an elastomer material having shock absorption. Therefore, it is possible to suppress the occurrence of impact sound and vibration while maintaining the stability of the pitch between the teeth in the second chipped gear 622 and the meshing performance with the first output gear 631 at a high level.

  Examples of the elastomer material having the shock absorption property that constitutes the second chipped gear 622 include a low-elasticity thermoplastic polymer material. Here, “low elasticity” is selected as “hardness” that does not deform the tooth portion and retains shock absorption when the second chipped gear 622 meshes with the first output gear 631. .

As the thermoplastic polymer material, for example, various thermoplastic elastomers such as styrene (butadiene styrene, isoprene styrene, etc.), ester, amide, urethane, etc., and their hydrogenated, modified products by others, Styrene, ABS, olefin (ethylene, propylene, ethylene propylene, ethylene styrene, propylene styrene, etc.), vinyl chloride, acrylate ester (methyl acrylate, etc.), methacrylate ester ( Methyl methacrylate, etc.) carbonate, acetal, nylon, halogenated polyether (eg, chlorinated polyether), halogenated olefin (eg, tetrafluoroethylene, fluorinated-ethylene chloride, ethylene fluoride) Propylene-based), cellulose-based (acetylene) Cellulose, ethyl cellulose, etc.), vinylidene, vinyl butyral, alkylene oxide type (propylene oxide-based, etc.) thermoplastic resin such as, and rubber-modified products of these resins.

  Next, the operation of the drive transmission device 6 will be described. 16A, 16B and 16C are diagrams for explaining the operation of the drive transmission device 6. FIG.

  When the flapper 651 rotates in a direction away from the first cam member 64 by energizing the solenoid 65, the locking between the flapper 651 and the locking portion 641 of the first cam member 64 is released. In this manner, with the locking between the flapper 651 and the locking portion 641 of the first cam member 64 being released, the biasing force of the rotation biasing arm 67 is used as shown in FIG. The first chipped gear 621 and the second chipped gear 622 rotate.

  When the first chipped tooth gear 621 is rotated by the biasing force of the rotation biasing arm 67 and the tooth part 621b at the most downstream side in the rotation direction of the first chipped tooth gear 621 reaches the tooth part of the second input gear 612, FIG. As shown in 16A (2), the rotation of the second input gear 612 is started. At this time, the tooth portion 621b in the rotation direction most downstream side of the first chipped gear 621 is arranged on the upstream side in the rotation direction than the tooth portion 622b in the rotation direction downstream of the second chipped gear 622. The second chipped gear 622 does not mesh with the first output gear 631, and therefore the first output gear 631 does not rotate.

  The rotation urging arm 67 that rotates so that the protrusion 671 moves along the cam surface of the second cam member 66 according to the rotation of the second chipped gear 622 has the protrusion 671 on the cam surface. When the position is reached, the turning operation is stopped. In such a state, the rotation biasing arm 67 does not give a rotatable biasing force to the first chipped gear 621 and the second chipped gear 622. For this reason, as shown to FIG. 16A (3), rotation of the 1st missing-tooth gear 621, the 2nd missing-tooth gear 622, and the 2nd input gear 612 is stopped. In the state shown in FIG. 16A (3), the first input gear 611 and the second input gear 612 rotate the first input gear 611 until the first input gear 611 is engaged with the second input gear 612. They are arranged in such a positional relationship that the moving distance coincides with the input rotation clearance 61A.

  Next, when the driving force from the motor output shaft MS is input to the first input gear 611 via the eleventh drive transmission gear 5Ka or the fifteenth drive transmission gear 5Kb of the drive transmission system 5, the first input gear 611 is Rotate.

  The first input gear 611 rotates within the range of the input rotation clearance 61A by the input of the driving force from the motor output shaft MS, and the upstream edge in the rotation direction of the drive input engagement hole 611a is the drive input engagement protrusion 612a. When abutting and engaging the upstream end in the rotational direction, the second input gear 612 rotates in conjunction with the rotation of the first input gear 611. As described above, when the second input gear 612 rotates, as shown in FIG. 16B (4), the first chipped gear 621 meshed with the second input gear 612 rotates, and the rotation of the first chipped gear 621 rotates. Accordingly, the second chipped gear 622 also rotates.

  When the second chipped gear 621 rotates, as shown in FIG. 16B (5), the tooth part 622 b at the most downstream side in the rotation direction of the second chipped gear 621 reaches the tooth part of the first output gear 631.

  When the tooth portion 622b on the most downstream side in the rotation direction of the second chipped gear 621 reaches the tooth portion of the first output gear 631, the rotation of the first output gear 631 is started as shown in FIG. 16B (6). .

  Then, the first output gear 631 rotates within the range of the output rotation clearance 63A due to the transmission of the driving force from the second chipped gear 622, and the upstream edge in the rotational direction of the drive output engagement hole 631a is engaged with the drive output. When contacting and engaging with the upstream end portion in the rotation direction of the projecting piece 632a, the second output gear 632 rotates in conjunction with the rotation of the first output gear 631, as shown in FIG. 16C (7).

  As described above, when the second output gear 632 rotates, the rotational driving force is transmitted to the transport feeder 271 of the toner container 27. In this way, the drive transmission device 6 transmits the driving force from the motor output shaft MS of the drive motor to the transport feeder 271 at a predetermined timing.

  When transmission of the driving force from the second output gear 632 to the transport feeder 271 is completed, the second output gear 632 is rotated by the biasing force of the biasing spring member 68. Accordingly, the first output gear 631 and the second output gear are set such that the rotational movement distance of the first output gear 631 until the first output gear 631 engages with the second output gear 632 coincides with the output rotation clearance 63A. 632 can be arranged.

  Next, details of the configuration of the solenoid 65 provided in the drive transmission device 6 will be described with reference to FIGS. 17 to 19. FIG. 17 is a plan view showing the vicinity of the solenoid 65 in the drive transmission device 6. FIG. 18 is a diagram for explaining the operation of the solenoid 65 in the drive transmission device 6. FIG. 19 is an enlarged plan view showing the vicinity of the solenoid 65 in the drive transmission device 6.

  The solenoid 65 includes a solenoid main body 65A and a flapper 651 rotatably attached to the solenoid main body 65A. In the solenoid 65, the flapper 651 can be rotated by energization. As described above, in the solenoid 65, the flapper 651 has its tip claw portion 651a locked to the locking portion 641 of the first cam member 64, and restricts the rotation of the first chipped gear 621 at a predetermined timing.

  The flapper 651 can be rotated between a first position and a second position different from the first position by energization and the energization stop. In the present embodiment, the flapper 651 rotates in a direction away from the first cam member 64 by energization of the solenoid 65, and is disposed at a first position separated from the first cam member 64. A state in which the flapper 651 is disposed at the first position is indicated by a solid line in FIG. When the flapper 651 is arranged at the first position by energizing the solenoid 65, the locking between the flapper 651 and the locking portion 641 of the first cam member 64 is released, and the first chipped gear 621 is released. Can be rotated.

  When the solenoid 65 is switched from the energized state to the energized stop state, the flapper 651 disposed at the first position separated from the first cam member 64 rotates in a direction close to the first cam member 64. When the energization of the solenoid 65 is stopped, the flapper 651 can be rotated until reaching the second position which is a stop position in the energization stop state. A state where the flapper 651 stops at the second position is indicated by a broken line in FIG.

  As described above, the flapper 651 can rotate between the first position by energization and the second position by energization stop. The flapper 651 is locked to the locking portion 641 of the first cam member 64 at a locking position between the first position and the second position.

  When the solenoid 65 is switched from the energized state to the energized stop state, the flapper 651 disposed at the first position separated from the first cam member 64 comes into contact with the first cam member 64 and is a stop position in the energized stop state. It tries to rotate until it reaches the second position. When the energization of the solenoid 65 is stopped, the flapper 651 rotates in the direction approaching the first cam member 64 and collides with the first cam member 64, so that an unpleasant impact sound is generated for the user. It may vibrate.

  Therefore, the drive transmission device 6 of this embodiment includes a rotation restricting member 69 as shown in FIG. The rotation restricting member 69 is a member that is arranged on the rotation path of the flapper 651 and restricts the rotation of the flapper 651 to the second position when the solenoid 65 changes from the energized state to the energized stop state. . Since the rotation restricting member 69 restricts the rotation of the flapper 651 to the second position when the solenoid 65 changes from the energized state to the energized stop state, the rotation restricting member 69 moves to the first cam member 64 due to the rotation of the flapper 651. Can be prevented. For this reason, it is possible to suppress the generation of impact sound and vibration caused by the collision of the flapper 651 with the first cam member 64.

  Further, it is desirable that the rotation restricting member 69 is disposed between the locking position and the second position on the rotation path of the flapper 651. Such an arrangement of the rotation restricting member 69 hinders the locking state between the flapper 651 and the locking portion 641 of the first cam member 64 at the locking position between the first position and the second position. Can be deterred.

  Furthermore, the rotation restricting member 69 is preferably made of an impact buffering material. The shock absorbing material is a material having cushioning properties, and examples thereof include rubber and polyurethane. With this configuration, it is possible to prevent an impact sound from being generated when the rotation restricting member 69 restricts the rotation of the flapper 651.

  The solenoid 65 may include a first shock-absorbing material 65Aa fixed to the solenoid body 65A and a second shock-absorbing material 651aa fixed to the tip claw portion 651a of the flapper 651. By adopting a configuration in which the first shock-absorbing material 65Aa is fixed to the solenoid body 65A, when the flapper 651 is rotated away from the first cam member 64 by energization, the flapper 651 directly with respect to the solenoid body 65A. Collision can be prevented. Thereby, generation | occurrence | production of the impact sound resulting from the collision with respect to the solenoid main body 65A of the flapper 651 can be suppressed. In addition, by adopting a configuration in which the second impact buffering material 651aa is fixed to the tip claw portion 651a, the tip claw portion 651a is locked when the tip claw portion 651a is locked to the locking portion 641 of the first cam member 64. A direct collision with the locking portion 641 can be prevented. Thereby, generation | occurrence | production of the impact sound resulting from the collision with respect to the latching | locking part 641 of the front-end | tip nail | claw part 651a can be suppressed.

  20A, 20 </ b> B, and 20 </ b> C are diagrams for explaining the function of the rotation restricting member 69 with respect to the operation of the solenoid 65 in the drive transmission device 6.

  As shown in FIG. 20A (1), in the solenoid 65, the flapper 651 is locked to the locking portion 641 of the first cam member 64 at the locking position between the first position and the second position. . Thereby, the rotation of the first chipped gear 621 is restricted. In a state where the flapper 651 is locked to the locking portion 641, the rotation restricting member 69 is separated from the flapper 651.

  When the solenoid 65 is energized, the flapper 651 rotates in a direction away from the first cam member 64 and is disposed at the first position away from the first cam member 64 as shown in FIG. . As a result, the locking between the flapper 651 and the locking portion 641 of the first cam member 64 is released, and the first chipped gear 621 rotates.

  When the energization of the solenoid 65 is stopped, the flapper 651 rotates in the direction approaching the first cam member 64 as shown in FIG. The flapper 651 that rotates in the direction approaching the first cam member 64 contacts the rotation restricting member 69 before reaching the second position. This restricts the rotation of the flapper 651 to the second position.

  In a state where the rotation of the flapper 651 in the direction approaching the first cam member 64 is restricted by the rotation restricting member 69, the rotation of the first chipped gear 621 continues as shown in FIG. 20B (4). Has been. The first cam member 64 fixed to the first chipped gear 621 rotates in conjunction with the rotation of the first chipped gear 621.

  When the first cam member 64 rotates in conjunction with the rotation of the first chipped gear 621 in a state where the rotation is restricted by the rotation restriction member 69 and the flapper 651 is in contact with the rotation restriction member 69 and is stationary, Eventually, as shown in FIG. 20B (5), the tip of the tip claw portion 651a of the flapper 651 comes into contact with the cam surface of the first cam member 64.

  Here, the distance from the center of the cam surface of the first cam member 64 is set so as to gradually increase from the downstream side in the rotational direction to the upstream side with reference to the locking portion 641. Referring to FIGS. 20B (5), 20B (6), 20C (7), 20C (8), and 20C (9), the distance from the center of the cam surface of the first cam member 64 is as follows. , Distance a, distance b, distance c, distance d, distance e.

  Since the cam surface of the first cam member 64 is configured as described above, when the tip of the tip claw portion 651a of the flapper 651 comes into contact with the cam surface of the first cam member 64, FIG. 20C (7) and FIG. 20C (8), the flapper 651 is configured such that the tip of the tip claw 651a moves along the cam surface of the first cam member 64 according to the rotation of the first cam member 64. To turn. As a result, the flapper 651 is separated from the rotation restricting member 69 (see FIG. 20C (8)).

  When the front end claw portion 651a moves along the cam surface of the first cam member 64 according to the rotation of the first cam member 64 and the front end claw portion 651a reaches the locking portion 641, FIG. As shown, the flapper 651 is locked to the locking portion 641. Thereby, the rotation of the first chipped gear 621 is restricted.

  As described above, the drive transmission device 6 of the present embodiment suppresses the generation of impact sound and vibration caused by the collision between the tooth portion of the second chipped gear 622 and the tooth portion of the first output gear 631. can do. Further, the drive transmission device 6 according to the present embodiment can suppress the generation of impact sound and vibration caused by the collision of the flapper 651 with the first cam member 64.

  Further, the image forming apparatus 1 provided with the drive transmission device 6 suppresses the generation of impact sound and vibration when the drive force from the motor output shaft MS of the drive motor is transmitted to the rotating body at a predetermined timing. It is possible to prevent the user from feeling uncomfortable and to prevent the occurrence of streak-like image defects in the image formed on the sheet.

1 Image forming device 2 Image forming unit (image forming system)
21 Photosensitive drum (image carrier)
23 Development Unit 27 Toner Container (Developer Supply Unit)
271 Conveying feeder 6 Drive transmission device 61 Drive input unit 611 First input gear 612 Second input gear 613 First shaft 61A Input rotation clearance 62 Chipped gear portion 621 First chipped gear 622 Second chipped gear 63 Drive output unit 631 1st output gear 632 2nd output gear 633 2nd shaft 63A Output rotation clearance 63B Radial direction clearance 64 1st cam member 641 Locking part 65 Solenoid 651 Flapper 66 2nd cam member (clamping member)
662 Cam part 67 Rotating urging arm (urging member)
69 Rotation restricting member

Claims (6)

A drive transmission device that transmits a driving force from a driving source to a rotating body at a predetermined timing,
A first input gear that is rotatably inserted into a predetermined first shaft and receives a driving force from the driving source;
A second input gear rotatably inserted into the first shaft and engageable with the first input gear;
A first chipped gear provided to mesh with the second input gear and having a chipped portion;
A second chipped gear disposed coaxially with the first chipped gear and having a chipped portion;
A first output gear that is rotatably inserted in a second shaft parallel to the first shaft, and is capable of meshing with the second chipped gear;
A second output gear that is rotatably inserted into the second shaft, engageable with the first output gear, and outputs a driving force from the first output gear to the rotating body;
The first output gear and the second output gear are:
An inner output gear adjacent to the second shaft is disposed with a clearance larger than a predetermined sliding clearance between the second shaft and the second shaft.
A drive transmission device engaged with each other with a predetermined output rotational clearance in the rotational direction.   The drive transmission device according to claim 1, wherein the first input gear and the second input gear are engaged with each other with a predetermined input rotation clearance in a rotation direction. A first cam member fixed to the first chipped gear and having a locking portion;
The drive transmission device according to claim 1, further comprising: a solenoid that is locked to the locking portion of the first cam member and restricts rotation of the first chipped gear at a predetermined timing. A second cam member fixed to the second chipped gear;
An urging member for urging the second cam member so that the first chipped gear and the second chipped gear are rotated when the locking with the locking portion by the solenoid is released; The drive transmission device according to claim 3, further comprising: An image forming system for forming an image on a sheet having a rotating body;
A driving source for generating a driving force for driving the rotating body;
An image forming apparatus comprising: the drive transmission device according to claim 1, wherein a drive force generated by the drive source is transmitted to the rotating body. The imaging system is
An image carrier having a peripheral surface carrying a developer image;
A developing section for supplying a developer to the peripheral surface of the image carrier;
A developer replenishing unit that replenishes developer to the developing unit, the developer replenishing unit including a replenishing unit main body that stores the developer, and a transport feeder that is disposed in the replenishing unit main body and conveys the developer And comprising
The image forming apparatus according to claim 5, wherein the rotating body is the transport feeder.

Images