JP2020189720A - Image forming device and image reading device - Google Patents

Abstract

To provide an image forming device capable of suppressing deterioration in the degree of parallelization between a driving gear rotary shaft disposed in a housing and a driven gear rotary shaft disposed in a rotating member rotatable with respect to the housing.SOLUTION: An image forming device comprises: a motor disposed in a housing; a driving gear 53 rotated by a driving force of the motor; bearings 5a and 5b arranged on both sides of the driving gear 53 in the thrust direction of a rotation shaft of the driving gear 53; a driven gear 54 which separates from the driving gear 53 when a right door is at an open position, and gears with the driving gear 53 so that the driving force of the motor is transmitted from the driving gear 53 when the right door is at a closed position; bearings 6a and 6b arranged on both sides of the driven gear 54 in the thrust direction of a rotation shaft of the driven gear 54; a holder member 7 holding the bearings 5a and 5b integrally, and having fitting grooves 7c and 7d where the bearings 6a and 6b is entered therein so as to be fitted and retained when the right door changes from the open position to the closed position; and springs 9a and 9b for urging the bearings 6a and 6b toward a depth side of the fitting grooves 7c and 7d.SELECTED DRAWING: Figure 4

Description

The present invention relates to an image forming apparatus such as an electrophotographic copying machine and an electrophotographic printer (for example, a laser beam printer, an LED printer, etc.) and an image reading device such as a scanner.

In the image forming apparatus, when removing the sheet that caused the jam or when replacing the consumables mounted inside the apparatus, the image forming apparatus rotates with respect to the housing of the image forming apparatus and opens and closes with respect to the housing. A configuration is known in which possible opening and closing members are opened to perform these operations.

Further, it is known that an opening / closing member supports a transport roller that transports a sheet. In this configuration, the driving force of the motor provided in the housing is transmitted to the transfer roller via gears. Specifically, a drive gear is provided on the housing side, a driven gear that meshes with the drive gear is provided on the opening / closing member, and the driving force of the motor is transmitted to the transfer roller via these gears. The driven gear is separated from the drive gear when the opening / closing member is opened, and meshes with the drive gear when the opening / closing member is closed so that the driving force of the motor can be transmitted.

Here, it is not easy to secure the position accuracy of the opening / closing member with respect to the housing due to the backlash of the rotating portion and the variation in size. Therefore, it is not easy to secure the meshing accuracy between the drive gear and the driven gear. On the other hand, Patent Document 1 describes a configuration in which the rotation axis of the driven gear is guided to a predetermined position by a guide member provided in the housing to improve the meshing accuracy between the drive gear and the driven gear. There is.

Japanese Unexamined Patent Publication No. 2006-117426

In the configuration described in Patent Document 1, one side of the rotating shaft of the driven gear with respect to the driven gear in the thrust direction is guided by a guide member and held at a predetermined position, but the other side is not held. It has become. When only one side of the rotating shaft of the driven gear is held in this way, the rotating shaft of the driven gear may be tilted and the parallelism between the rotating shaft of the driven gear and the rotating shaft of the driven gear may deteriorate. is there. If the parallelism between the two deteriorates, the alignment between the drive gear and the driven gear may be lost, and the following problem may occur.

FIG. 13 is a perspective view of the drive gear and the driven gear. Here, FIG. 13A shows a configuration in which the rotation shaft of the drive gear and the rotation shaft of the driven gear are arranged in parallel. As shown in FIG. 13B, when the rotation axis of the drive gear and the rotation axis of the driven gear are arranged at an angle θ1 in the vertical direction, the relationship between the tooth surfaces of the drive gear and the driven gear is twisted. There is a discrepancy error. As shown in FIG. 13C, when the rotation axis of the drive gear and the rotation axis of the driven gear are arranged at an angle θ2 in the horizontal direction, the parallel error is such that the rotation axes of the rotation axes intersect with each other. Occurs. Such discrepancy error and parallel error cause uneven wear between the drive gear and the driven gear, drive transmission error, and abnormal noise. Therefore, it is desirable that the parallelism between the rotating shaft of the driving gear and the rotating shaft of the driven gear be kept good.

Therefore, in view of the current situation, the present invention has parallelism between the rotation shaft of the drive gear provided in the housing and the rotation shaft of the driven gear provided in the rotating member that can rotate with respect to the housing. It is an object of the present invention to provide an image forming apparatus capable of suppressing deterioration of the above.

A typical configuration of the image forming apparatus according to the present invention for achieving the above object includes a motor provided in the housing of the image forming apparatus and a rotating shaft, and the rotating shaft is pivotally supported by the housing. A first gear that rotates by the driving force of the motor, and a first bearing that is attached to the rotation shaft of the first gear and is arranged on one side of the first gear in the direction of the rotation axis of the first gear. A second gear provided with a second bearing arranged on the other side and a rotating shaft, meshed with the first gear, and the driving force of the motor is transmitted via the first gear to rotate, and the second gear. With respect to the housing so that a gear is attached and a first position where the first gear and the second gear mesh with each other and a second position where the second gear is separated from the first gear can be taken. Rotating member, a third bearing attached to the rotation shaft of the second gear and arranged on one side of the second gear in the direction of the rotation axis of the second gear, and a third bearing arranged on the other side. The fourth bearing and the holding member provided in the housing and integrally holding the first bearing and the second bearing, and the movement of the third bearing with the rotation of the rotating member. Formed on the locus, the third bearing enters when the rotating member moves from the second position to the first position, and the third bearing when the rotating member is located at the first position. Is formed on the first groove portion extending in the rotation direction of the rotating member and the movement locus of the fourth bearing accompanying the rotation of the rotating member, and the rotating member is formed from the second position. A second extending in the rotational direction of the rotating member, which enters the fourth bearing when moving to the first position and holds the fourth bearing when the rotating member is located at the first position. A holding member having a groove portion, a first urging member that urges the third bearing toward the back side of the first groove portion when the rotating member is located at the one position, and the rotation. It is characterized by including a second urging member that urges the fourth bearing toward the inner side of the second groove when the member is located at the one position.

According to the present invention, in the image forming apparatus, the parallelism between the rotation shaft of the drive gear provided in the housing and the rotation shaft of the driven gear provided in the rotating member that can rotate with respect to the housing. It is possible to suppress the deterioration of.

It is sectional drawing of the image forming apparatus. It is a perspective schematic view of an image forming apparatus. It is the schematic of the drive part which drives a transport roller. It is a front view and a side view of a holder member, a drive gear, and a driven gear. It is sectional drawing around the holder member. It is a perspective view of a spring holding member and a driven gear. It is a figure which shows the other structure of a holder member. It is sectional drawing of the image reader. It is a perspective view of the drive part of ADF. It is sectional drawing of the drive part of ADF. It is the schematic of the drive part which drives a transport roller. It is sectional drawing around the holder member. It is a perspective view of the drive gear and the driven gear.

(First Embodiment)
<Image forming device>
Hereinafter, the overall configuration of the image forming apparatus according to the first embodiment of the present invention will be described with reference to the drawings together with the operation at the time of image forming. It should be noted that the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention to those, unless otherwise specified.

FIG. 1 is a schematic cross-sectional view of the image forming apparatus A. As shown in FIG. 1, the image forming apparatus A includes an image forming unit 61 that transfers a toner image onto a sheet to form an image, a sheet feeding unit 62 that supplies a sheet to the image forming unit 61, and a sheet. Is provided with a fixing portion 36 for fixing the toner image. Further, an image reading device 80 for reading an image of a document is provided above the image forming device A. The detailed configuration of the image reader 80 will be described later.

The image forming unit 61 includes a process cartridge 65 (65Y, 65M, 65C, 65K), a laser scanner unit 28, a primary transfer roller 31 (31Y, 31M, 31C, 31K), an intermediate transfer belt 30, a secondary transfer roller 13, and two. The next transfer facing roller 32 and the like are provided. The process cartridge 65 includes a photosensitive drum 26 (26Y, 26M, 26C, 26K), a charging roller 27 (27Y, 27M, 27C, 27K), and a developing device 29 (29Y, 29M, 29C, 29K), respectively.

Next, the image forming operation will be described. First, when the control unit (not shown) receives the image forming job signal, the sheet S loaded and stored in the sheet cassette 22 is conveyed to the resist roller 24 by the feeding roller 66. When the sheet S loaded on the manual feed tray 45 is fed, the sheet S loaded on the manual feed tray 45 is conveyed to the resist roller 24 by the feed roller 67.

The resist roller 24 conveys the sheet S to the secondary transfer portion formed by the secondary transfer roller 13 and the secondary transfer opposed roller 32 at a predetermined timing. In the resist roller 24, a nip portion is formed by two pairs of rollers (resist rollers 24a and 24b), and the sheet S is sandwiched and conveyed by the nip portion.

On the other hand, in the image forming unit 61, the surface of the photosensitive drum 26Y is first charged by the charging roller 27Y. After that, the laser scanner unit 28 irradiates the surface of the photosensitive drum 26Y with laser light in response to the image signal input from the image reading device 80 or the image signal input from an external device such as a personal computer. That is, the image forming apparatus A functions as a copying machine when an image signal is input from the image reading device 80, and functions as a printer when an image signal is input from an external device. In this way, an electrostatic latent image is formed on the surface of the photosensitive drum 26Y.

After that, the developing device 29Y attaches the yellow toner to the electrostatic latent image formed on the surface of the photosensitive drum 26Y, and forms the yellow toner image on the surface of the photosensitive drum 26Y. The toner image formed on the surface of the photosensitive drum 26Y is primarily transferred to the intermediate transfer belt 30 by applying a bias to the primary transfer roller 31Y.

By the same process, magenta, cyan, and black toner images are formed on the photosensitive drums 26M, 26C, and 26K. Then, by applying a bias to the primary transfer rollers 31M, 31C, and 31K, these toner images are transferred superimposed on the yellow toner image on the intermediate transfer belt 30. As a result, a full-color toner image is formed on the surface of the intermediate transfer belt 30.

In the intermediate transfer belt 30, the secondary transfer opposing roller 32 is rotated by a driving force of a motor (not shown), and the intermediate transfer belt 30 is driven around the intermediate transfer belt 30. When the intermediate transfer belt 30 carrying the toner image moves, the toner image is sent to the secondary transfer unit. Then, by applying a bias to the secondary transfer roller 13 in the secondary transfer unit, the toner image on the intermediate transfer belt 30 is transferred to the sheet S.

Next, the sheet S to which the toner image is transferred is heated and pressurized at the fixing portion 36, whereby the toner image on the sheet S is fixed to the sheet S. After that, the sheet S on which the toner image is fixed is discharged to the discharge unit 40 by the discharge roller 38.

When an image is formed on both sides of the sheet S, the discharge roller 38 is rotated in the reverse direction when the sheet S is conveyed to the discharge roller 38, and the transfer path of the sheet S is switched by a flapper (not shown). As a result, the sheet S is conveyed to the inverted transfer path 69 with the front and back inverted. After that, the sheet S is conveyed to the transfer rollers 41, 42, 43 in the reversal transfer path 69, and then transferred to the resist roller 24. After that, an image is formed on the back surface of the sheet S in the same manner as the process described above.

<Door>
Next, the configuration of each door that can be opened and closed with respect to the housing 1 of the image forming apparatus A will be described.

FIG. 2 is a schematic perspective view of the image forming apparatus A. As shown in FIG. 2, the image forming apparatus A is provided with a front door 10, a right door 11, and a paper ejection door 12. These members are configured to be movable between an open position that is open with respect to the housing 1 and a closed position that is closed with respect to the housing 1.

The front door 10 is rotatably supported in the direction of arrow R1 with respect to the housing 1. The paper ejection door 12 is rotatably supported in the direction of arrow R2 with respect to the housing 1. The user can replace the process cartridge 65 with the front door 10 in the open position.

The right door 11 (rotating member) is rotatably supported with respect to the housing 1 in the direction of arrow R3. The right door 11 supports the secondary transfer roller 13, the resist roller 24a, and the transfer rollers 42, 43. When the right door 11 is moved from the closed position to the open position, the secondary transfer roller 13 is separated from the intermediate transfer belt 30. As a result, the sheet S that is sandwiched between the two and is the cause of the jam can be easily removed. Further, when the right door 11 is moved from the closed position to the open position, the resist roller 24a is separated from the resist roller 24b. As a result, the sheet S that is sandwiched between the two and is the cause of the jam can be easily removed.

<Drive>
Next, the configuration of the drive unit that drives the transfer roller 42 will be described. The transfer rollers 41 and 43 are also driven in the same manner as the transfer rollers 42.

FIG. 3 is a schematic perspective view of a drive unit that drives the transfer roller 42. In FIG. 3, the right door 11 is located in a closed position closed with respect to the housing 1. As shown in FIG. 3, the housing 1 is provided with a motor 3. A pinion gear 51 is press-fitted into the rotating shaft of the motor 3.

Further, the housing 1 is provided with idler gears 52a, 52b, 52c that mesh with the pinion gear 51 in order, and a drive gear 53 (first gear) that meshes with the idler gear 52c. As a result, the driving force of the motor 3 is transmitted to the driving gear 53 via the pinion gear 51 and the idler gears 52a to 52c. The motor 3 and idler gears 52a to 52c are fixed to the sheet metal which is the frame of the housing 1.

Further, resin bearings 5a and 5b (see FIG. 4) are attached to the rotating shaft 53a of the drive gear 53. In the direction of the rotation axis of the drive gear 53, the bearing 5a (first bearing) is arranged adjacent to the drive gear 53 on one side of the drive gear 53, and the bearing 5b (second bearing) is driven by the other side of the drive gear 53. It is arranged adjacent to the gear 53. In the present embodiment, the drive gear 53 and its rotating shaft 53a are integrally molded, but they may be used as separate members.

Further, the right door 11 supports a driven gear 54 (second gear) that meshes with the drive gear 53 when the right door 11 is in the closed position. A pulley 55 is attached to the rotating shaft 54a of the driven gear 54. Further, a pulley 56 is attached to one end of the rotating shaft 42a of the transport roller 42 supported by the right door 11. A drive transmission belt 57 is stretched on the pulley 55 and the pulley 56. As a result, the driving force of the motor 3 transmitted to the driven gear 54 via the drive gear 53 is transmitted to the transfer roller 42 via the drive transmission belt 57.

Further, resin bearings 6a and 6b (see FIG. 4) are attached to the rotating shaft 54a of the driven gear 54. In the direction of the rotation axis of the driven gear 54, the bearing 6a (third bearing) is arranged adjacent to the driven gear 54 on one side of the driven gear 54, and the bearing 6b (fourth bearing) is the driven gear 54. It is arranged adjacent to the driven gear 54 on the other side. In the present embodiment, the driven gear 54 and its rotating shaft 54a are integrally molded, but they may be separate members.

As described above, since the transport roller 42 and the driven gear 54 are supported by the right door 11, when the right door 11 is located in the open position (second position), the driven gear 54 is separated from the drive gear 53. , Both are in a state where the drive cannot be transmitted without meshing. On the other hand, when the right door 11 is in the closed position (first position), the driven gear 54 and the drive gear 53 mesh with each other, and the driving force of the motor 3 is transmitted from the drive gear 53 to the driven gear 54. .. That is, when the right door 11 is located in the closed position, the driving force of the motor 3 is transmitted to the transport roller 42 via the pinion gear 51, the idler gears 52a to 52c, the drive gear 53, the driven gear 54, and the drive transmission belt 57. , The transport roller 42 is rotationally driven.

<Holder member>
It is not easy to secure the position accuracy of the right door 11 with respect to the housing 1 due to the backlash of the rotating portion and the variation in size. Therefore, it is not easy to secure the parallelism between the rotating shaft 53a of the driving gear 53 and the rotating shaft 54a of the driven gear 54. If the parallelism between the two is not ensured, the above-mentioned discrepancy error and parallelism error may occur between the drive gear 53 and the driven gear 54. Therefore, in the present embodiment, the holder member 7 and the springs 9a and 9b held by the spring holding member 58 suppress the deterioration of the parallelism between the rotating shaft 53a of the driving gear 53 and the rotating shaft 54a of the driven gear 54. Hereinafter, the configurations of the holder member 7 and the springs 9a and 9b held by the spring holding member 58 will be described.

FIG. 4 is a diagram showing the configuration of the holder member 7, the drive gear 53, and the driven gear 54 when the right door 11 is in the closed position. FIG. 4A is a left side view and FIG. 4B is a view. Is a front view, and FIG. 4 (c) is a right side view. FIG. 5 is a schematic cross-sectional view of the periphery of the holder member 7. Here, FIG. 5A shows a state in which the right door 11 is located in the closed position, and FIG. 5B shows a state in which the right door 11 is located in the open position. FIG. 6 is a perspective view of the spring holding member 58 and the driven gear 54.

As shown in FIGS. 3, 4, and 5, the holder member 7 (holding member) is a resin member provided in the housing 1 and made of POM (polyacetal resin) or ABS resin. The holder member 7 has fitting holes 7a and 7b (first fitting hole, second fitting hole) into which bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are fitted, respectively. Further, the holder member 7 has fitting grooves 7c and 7d (first groove portion and second groove portion) into which bearings 6a and 6b attached to the rotating shaft 54a of the driven gear 54 are fitted, respectively.

As described above, the driven gear 54 is supported by the right door 11. Therefore, the bearings 6a and 6b attached to the rotating shaft 54a of the driven gear 54 are covered by the rotation of the right door 11 with the rotating shaft 54a of the driven gear 54 inserted through the openings of the bearings 6a and 6b. It rotates together with the rotation shaft 54a of the drive gear 54. The fitting groove 7c of the holder member 7 is a groove formed on the movement locus of the bearing 6a accompanying the rotation of the right door 11 and extending in the rotation direction of the right door 11. The fitting groove 7d is a groove formed on the movement locus of the bearing 6b accompanying the rotation of the right door 11 and extending in the rotation direction of the right door 11. The fitting grooves 7c and 7d can also be said to be recesses recessed in the rotation direction of the right door 11 from the surface of the holder member 7 facing the right door 11.

Further, the right door 11 is provided with a spring holding member 58 (another holding member) for holding the springs 9a and 9b which are torsion coil springs. As shown in FIG. 6, the spring holding member 58 has claw portions 58a and 58b and through holes 58c and 58d. Bearings 6a and 6b attached to the rotating shaft 54a of the driven gear 54 are inserted and fitted into the through holes 58c and 58d (first hole and second hole). That is, the spring holding member 58 holds the rotating shaft 54a of the driven gear 54 via the bearings 6a and 6b. Since the diameters of the through holes 58c and 58d are about 1 mm larger than the diameters of the bearings 6a and 6b, the bearings 6a and 6b are loosely fitted into the through holes 58c and 58d. Further, the bearings 6a and 6b are fitted into the fitting grooves 7c and 7d at the end side of the rotating shaft 54a of the driven gear 54 rather than the portions loosely fitted in the through holes 58c and 58d.

A spring 9a (first urging member) is fitted to the claw portion 58a of the spring holding member 58, whereby one end of the spring 9a is held by the spring holding member 58. The other end of the spring 9a is in contact with the bearing 6a and urges the bearing 6a. Similarly, a spring 9b (second urging member) is fitted to the claw portion 58b of the spring holding member 58, whereby one end of the spring 9b is held by the spring holding member 58. The other end of the spring 9a is in contact with the bearing 6b and urges the bearing 6b. When the right door 11 is in the closed position, the spring 9a urges the bearing 6b together with the rotating shaft 54a of the driven gear 54 to the back side of the fitting groove 7c, and the spring 9b causes the bearing 6b to rotate the driven gear 54. It is urged to the back side of the fitting groove 7d together with the shaft 54a.

That is, in the present embodiment, the springs 9a and 9b and the bearings 6a and 6b are integrally held by the spring holding member 58. However, the present invention is not limited to this, and for example, the right door 11 may be provided with a through hole for loosely fitting the bearings 6a and 6b and a portion for holding the springs 9a and 9b. Further, if the configuration is such that the degree of freedom of movement of the rotating shaft 54a of the driven gear 54 is secured, not only the bearings 6a and 6b are loosely fitted and held, but also the rotating shaft 54a of the driven gear 54 is directly mounted. The configuration may be retained.

As shown in FIG. 5A, when the right door 11 is in the open position, the bearings 6a and 6b attached to the rotating shaft 54a of the driven gear 54 are separated from the holder member 7, so that the holder member Not held at 7. On the other hand, the bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are fitted and held in the fitting holes 7a and 7b of the holder member 7. In this state, the drive gear 53 and the driven gear 54 are not meshed with each other.

In the process of moving the right door 11 from the open position to the closed position, the bearings 6a and 6b attached to the rotating shaft 54a of the driven gear 54 are guided by the inner walls of the fitting grooves 7c and 7d to form the fitting grooves. It enters the inside of 7c and 7d. After that, as shown in FIG. 5B, when the right door 11 moves to the closed position, the bearings 6a and 6b abut on the inner wall on the inner side of the fitting grooves 7c and 7d and fit into the fitting grooves 7c and 7d. It is held together.

When the bearing 6a is fitted into the fitting groove 7c, the bearing 6a is urged by the spring 9a toward the inner side of the fitting groove 7c. Similarly, when the bearing 6b is fitted into the fitting groove 7d, the bearing 6b is urged by the spring 9b toward the inner side of the fitting groove 7d. When the motor 3 is driven while the bearings 5a and 5b and the bearings 6a and 6b are held by the holder member 7, the bearings 5a and 5b and the bearings 6a and 6b are held and driven by the holder member 7 in a non-rotating state. The rotating shaft 53a of the gear 53 and the rotating shaft 54a of the driven gear 54 rotate.

In this way, the holder member 7 integrally holds the bearing 5a arranged on one side of the drive gear 53 and the bearing 5b arranged on the other side at a predetermined position with respect to the rotation axis direction of the drive gear 53. Further, with respect to the direction of the rotation axis of the driven gear 54, the bearing 6a arranged on one side of the driven gear 54 and the bearing 6b arranged on the other side are integrally held at predetermined positions. As a result, deterioration of the parallelism between the rotating shaft 53a of the drive gear 53 to which the bearings 5a and 5b are attached and the rotating shaft 54a of the driven gear 54 to which the bearings 6a and 6b are attached can be suppressed. Therefore, it is possible to suppress the above-mentioned misalignment error and parallel error between the drive gear 53 and the driven gear 54, and uneven wear and drive transmission error between the drive gear 53 and the driven gear 54. , The generation of abnormal noise can be suppressed.

When the right door 11 is in the closed position, the bearing 6a attached to the rotating shaft 54a of the driven gear 54 is urged by the spring 9a toward the back side of the fitting groove 7c. Similarly, the bearing 6b attached to the rotating shaft 54a of the driven gear 54 is urged by the spring 9b toward the inner side of the fitting groove 7d. As a result, the rotation shaft 54a of the driven gear 54 is restricted from moving in the moving direction from the closed position to the open position of the right door 11. Therefore, when the right door 11 is in the closed position, the rotation shaft 54a of the driven gear 54 is restricted from moving inside the fitting grooves 7c and 7d, and the rotation shaft 53a of the drive gear 53 and the driven gear 54 Deterioration of the parallelism of the rotating shaft 54a can be suppressed more effectively.

Further, depending on the influence of the tolerance of the holder member 7, when the right door 11 moves from the open position to the closed position, the bearings 6a and 6b are moved to the back side of the fitting grooves 7c and 7d before the right door 11 reaches the closed position. There is a risk that the right door 11 will not be completely closed because it reaches the inner wall of the door. In the present embodiment, the diameters of the through holes 58c and 58d are about 1 mm larger than the diameters of the bearings 6a and 6b. Therefore, in such a case, the right door 11 moves about 1 mm together with the spring holding member 58 toward the closed position. be able to. Therefore, it is possible to prevent the right door 11 from being unable to move to the closed position.

In this embodiment, the configuration in which the rotary shaft 53a of the drive gear 53 and the rotary shaft 54a of the driven gear 54 are held by the holder member 7 via the bearings 5a and 5b and the bearings 6a and 6b has been described. However, the present invention is not limited to this. That is, in a configuration such as an idler gear in which the drive gear 53 and the driven gear 54 are rotatably held with respect to these rotating shafts, the rotating shaft 53a and the driven gear of the drive gear 53 are not used. The rotation shaft 54a of 54 may be directly held by the holder member 7. In this case, with respect to the rotation axis direction of the drive gear 53, one side portion (first portion) of the drive gear 53 with respect to the drive gear 53 is held by the fitting hole 7a, and the other side portion (second portion) is held. ) Is held in the fitting hole 7b. Further, with respect to the direction of the rotation axis of the driven gear 54, one side portion (third portion) of the driven gear 54 with respect to the driven gear 54 on the rotation shaft 54a is held by the fitting groove 7c, and the other side portion (fourth portion). The portion) is held by the fitting groove 7d. Further, the springs 9a and 9b are provided so as to be in direct contact with the rotating shaft 54a of the driven gear 54. As a result, the same effect as described above can be obtained.

Further, in the present embodiment, the configuration in which the fitting grooves 7c and 7d of the holder member 7 penetrate in the direction of the rotation axis of the driven gear 54 has been described, but the present invention is not limited to this. That is, as shown in FIG. 7, the same effect as described above can be obtained even if a wall is provided on the end side of the rotating shaft 54a of the driven gear 54 in the fitting grooves 7c and 7d of the holder member 7. ..

<Image reader>
Next, the configuration of the image reading device 80 will be described.

FIG. 8 is a schematic cross-sectional view of the image reading device 80. As shown in FIG. 8, the image reading device 80 is composed of a reader 81 and an ADF82 (: Auto Document Feeder: automatic document transporting device). The ADF 82 is rotatably supported by a hinge (not shown) with respect to the reader 81.

The reader 81 includes a first scanner unit 304 that reads an image of the sheet S that is a document, a contact glass 303, and a platen glass 71. The first scanner unit 304 is configured to be movable in the direction of arrow D between the lower portion of the contact glass 303 and the lower portion of the platen glass 71 by a drive belt (not shown).

The first scanner unit 304 includes a light source 72, a mirror 73, and a CCD 74 which is an image reading element. The first scanner unit 304 scans the light from the light source 72 onto the sheet S, and guides the reflected light from the sheet S to the CCD 74 by the mirror 73. The CCD 74 receives the reflected light, reads the image data of the sheet S, and converts the image data into an electric signal.

When reading the image of the sheet S with the reader 81, the sheet S is placed on the platen glass 71, and the image of the sheet S is read while the first scanner unit 304 is moved in the direction of the arrow M by a drive belt (not shown). read. Access to the platen glass 71 is made possible by rotating the ADF 82 and opening it upward.

The ADF 82 conveys a document tray 251 for loading a sheet S as a document, a feeding roller 203 for feeding the sheet S loaded on the document tray 251 and a sheet S fed by the feeding roller 203. A roller 207 is provided. The feeding roller 203 is configured to be able to move up and down by a moving mechanism (not shown), and when feeding the sheet S, it lowers and comes into contact with the sheet S loaded on the document tray 251. The transfer roller 207 is provided by pressure contacting the separation pad 208.

Further, the AFD 82 includes feed rollers 300a to 300c for conveying the sheet S and a resist roller 301. The resist roller 301 forms a nip portion by two pairs of rollers (resist rollers 301a and 301b), and the sheet S is sandwiched and conveyed by the nip portion. Here, the resist roller 301b is rotated by the driving force of the motor 230 shown in FIG. 8, and the resist roller 301a is driven by the resist roller 301b to rotate.

Further, the ADF 82 includes a second scanner unit 307 that reads an image of the sheet S. The second scanner unit 307 includes a light source 75, a mirror 76, and a CCD 77 which is an image reading element. The second scanner unit 307 scans the light from the light source 75 onto the sheet S, and guides the reflected light reflected from the sheet S to the CCD 77 by the mirror 76. The CCD 77 receives the reflected light, reads the image data of the sheet S, and converts the image data into an electric signal.

Further, the ADF 82 includes a stopper 206 that restricts the sheet S loaded on the document tray 251 from entering the transport path. The stopper 206 is rotatably supported by the support portion 206a. The stopper 206 stands up to restrict the entry of the seat S into the transport path when the feeding roller 203 is raised and the seat S is not fed. Further, the stopper 206 rotates so that the feeding roller 203 lowers and the seat S is fed so as to be in a posture along the transport direction of the seat S to allow the seat S to enter the transport path. To do.

Further, the ADF 82 is provided with an opening / closing cover 209 (rotating member) as an exterior. The opening / closing cover 209 is rotatably supported by a support shaft 50a provided on the housing 50 of the ADF 82, and the gap between the open position and the closed closed position with respect to the housing 50 is shown in FIG. It rotates in the direction of the arrow R4 shown. The opening / closing cover 209 supports the feeding roller 203, the transport roller 207, the resist roller 301a, and the stopper 206.

When the image of the sheet S is read by the ADF 82, the sheet S loaded on the document tray 251 is first separated into one sheet by the separation pad 208, and then transferred to the resist roller 301 by the feed roller 203, the transfer roller 207, and the feed roller 300a. Be transported. The sheet S conveyed to the resist roller 301 is pushed in while being abutted against the nip portion of the resist roller 301 in a state where the tip portion thereof is stopped, thereby correcting the skew.

Next, the sheet S is conveyed to the feed roller 300b and reaches the contact glass 303. Then, the image of the first surface of the sheet S is read by the first scanner unit 304 on the contact glass 303. After that, the sheet S is conveyed by the feed roller 300c and reaches the contact glass 306. Here, when the user is instructed to read the image of the second surface of the sheet S, the image of the second surface of the sheet S is read by the second scanner unit 307 on the contact glass 306. After that, the sheet S is discharged to the discharge tray 309 by the discharge roller 308.

<Drive>
Next, the configuration of the drive unit of the ADF 82 will be described.

FIG. 9 is a perspective view of the drive unit of the ADF 82 when the open / close cover 209 is in the closed position. FIG. 10 is a cross-sectional view of the drive unit of the ADF 82. Here, FIG. 10A shows a state in which the open / close cover 209 is located in the open position, and FIG. 10B shows a state in which the open / close cover 209 is located in the closed position.

As shown in FIG. 9, a motor 230 is provided in the housing 50 of the ADF 82. A rotating belt 254 is hung around the rotating shaft 230a of the motor 230 and the rotating shaft 301b1 of the resist roller 301b. As a result, the driving force of the motor 230 is transmitted to the rotating shaft 301b1 of the resist roller 301b via the rotating belt 254.

An idler gear 253 is attached to the rotating shaft 301b1 of the resist roller 301b. The idler gear 253 meshes with the idler gear 252a attached to the idler shaft 252c. Further, in the idler shaft 252c, the idler gear 252b is mounted coaxially with the idler gear 252a.

The idler gear 252b meshes with the drive gear 255 (first gear). Resin bearings 405a and 405b are attached to the rotating shaft 255a of the drive gear 255. In the direction of the rotation axis of the drive gear 255, the bearing 405a is arranged on one side of the drive gear 255, and the bearing 405b is arranged on the other side of the drive gear 255. The rotating shaft 255a of the drive gear 255 is integrally formed with a lower guide plate 273b (FIG. 10) supported by the housing 50 of the ADF 82, which will be described later.

When the open / close cover 209 is located in the closed position, the drive gear 255 meshes with the driven gear 220 (second gear) supported by the open / close cover 209. Resin bearings 406a and 406b are attached to the rotating shaft 220a of the driven gear 220. In the direction of the rotation axis of the driven gear 220, the bearing 406a is arranged on one side of the driven gear 220, and the bearing 406b is arranged on the other side of the driven gear 220.

Further, the rotating shaft 220a of the driven gear 220 is connected to the rotating shaft 207a of the transport roller 207 by an old dam joint 256. One end of the rotating shaft 220a of the driven gear 220 and one end of the rotating shaft 207a of the transport roller 207 are fitted into two through holes (not shown) formed in the opening / closing cover 209 and held by the opening / closing cover 209. To. The diameter of the through hole (not shown) is about 1 mm larger than the diameter of the rotating shaft 220a of the driven gear 220 and the rotating shaft 207a of the transport roller 207. Therefore, the rotating shaft 220a of the driven gear 220 and the rotating shaft 207a of the transport roller 207 are loosely fitted in the through holes (not shown). That is, when the rotating shaft 207a of the transport roller 207 is considered to be a part of the rotating shaft 220a of the driven gear 220, one end and the other end of the rotating shaft 207a of the transport roller 207 with respect to the driven gear 220 are the opening / closing cover 209. It is loosely fitted in each of the through holes. If the degree of freedom of movement of the rotating shaft 220a of the driven gear 220 is ensured, the bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 are loosely fitted to the open / close cover 209. There may be.

When a current is supplied to the motor 230 while the open / close cover 209 is in the closed position, the driving force of the motor 230 is in the order of the rotating belt 254, the idler gear 252a, the idler gear 252b, the drive gear 255, and the driven gear 220. Be transmitted. Then, when the driving force of the motor 230 is transmitted to the driven gear 220, the rotating shaft 220a of the driven gear 220 rotates, and the conveyor roller connected to the rotating shaft 220a of the driven gear 220 via the Oldham joint 256. The rotation shaft 207a of 207 also rotates.

Further, pulleys 223a and 223b are attached to the rotating shaft 207a of the transport roller 207 and the rotating shaft 203a of the feeding roller 203, respectively. A rotating belt 225 is hung around the pulleys 223a and 223b. The driving force of the motor 230 transmitted to the rotating shaft 207a of the transport roller 207 is transmitted to the rotating shaft 203a of the feeding roller 203 via the pulleys 223a and 223b and the rotating belt 225.

As shown in FIG. 10, the ADF 82 includes an upper guide plate 273a and a lower guide plate 273b, both of which form a transport path H for transporting a sheet S as a document. The upper guide plate 273a is supported by the opening / closing cover 209. The lower guide plate 273b is supported by the housing 50 of the ADF 82. As described above, the lower guide plate 273b is integrally formed with a rotating shaft 255a that pivotally supports the drive gear 255.

When the opening / closing cover 209 rotates from the closed position to the open position, the upper guide plate 273a supported by the opening / closing cover 209 also rotates together, and the transport path H from the document tray 251 to the contact glass 303 is exposed. By positioning the opening / closing cover 209 in the open position in this way, the user can easily remove the sheet S that is the cause of the jam that stays in the transport path H.

As described above, since the transport roller 207 is supported by the open / close cover 209, when the open / close cover 209 is located in the open position (second position), the driven gear 220 is separated from the drive gear 255, and both of them are separated from each other. Is in a state where the drive cannot be transmitted without meshing. On the other hand, when the open / close cover 209 is located in the closed position (first position), the driven gear 220 and the drive gear 255 mesh with each other, and the driving force of the motor 230 is transmitted from the drive gear 255 to the driven gear 220. The transport roller 207 is rotationally driven.

It is not easy to secure the positional accuracy of the opening / closing cover 209 with respect to the housing 50 of the ADF 82 due to the backlash of the rotating portion and the variation in size. Therefore, it is not easy to secure the parallelism between the rotating shaft 255a of the drive gear 255 and the rotating shaft 207a of the transport roller 207. If the parallelism between the two is not ensured, the above-mentioned discrepancy error and parallel error may occur between the drive gear 255 and the driven gear 220. Therefore, the holder member 407 and the springs 8a and 8b suppress the deterioration of the parallelism between the rotating shaft 255a of the drive gear 255 and the rotating shaft 207a of the transport roller 207.

As shown in FIGS. 9 and 10, the holder member 407 (holding member) is a resin member provided in the housing 50 and made of POM (polyacetal resin) or ABS resin. The holder member 407 has fitting holes 407a and 407b (first fitting hole, second fitting hole) into which bearings 405a and 405b attached to the rotating shaft 255a of the drive gear 255 are fitted, respectively. Further, the holder member 407 has fitting grooves 407c and 407d (first groove portion and second groove portion) into which bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 are fitted, respectively.

As described above, the driven gear 220 is supported by the open / close cover 209. Therefore, the bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 rotate together with the rotating shaft 220a of the driven gear 220 by rotating the opening / closing cover 209 with the rotating shaft 220a inserted through the opening. Move. The fitting groove 407c of the holder member 407 is a groove formed on the movement locus of the bearing 406a accompanying the rotation of the opening / closing cover 209 and extending in the rotation direction of the opening / closing cover 209. The fitting groove 407d is a groove formed on the movement locus of the bearing 406b accompanying the rotation of the opening / closing cover 209 and extending in the rotation direction of the opening / closing cover 209. The fitting grooves 407c and 407d can also be said to be recesses recessed in the rotation direction of the opening / closing cover 209 from the surface of the holder member 407 facing the opening / closing cover 209.

A spring 8a (first urging member) and a spring 8b (second urging member), which are compression coil springs, are attached to the opening / closing cover 209. One ends of the springs 8a and 8b are attached and held to the bosses 18a and 18b formed on the opening / closing cover 209, respectively, and the other ends of the springs 8a and 8b are in contact with the bearings 406a and 406b. It is urging 406b. Specifically, when the opening / closing cover 209 is in the closed position, the spring 8a urges the bearing 406b together with the rotating shaft 220a of the driven gear 220 to the back side of the fitting groove 407c, and the spring 8b The bearing 406b is urged to the back side of the fitting groove 407d together with the rotating shaft 220a.

As shown in FIG. 10A, when the open / close cover 209 is in the open position, the bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 are separated from the holder member 407, so that the holder member Not held at 407. On the other hand, the bearings 405a and 405b attached to the rotating shaft 255a of the drive gear 255 are fitted and held in the fitting holes 407a and 407b of the holder member 407. In this state, the drive gear 255 and the driven gear 220 are not meshed with each other.

In the process of moving the opening / closing cover 209 from the open position to the closed position, the bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 are guided by the inner walls of the fitting grooves 407c and 407d and are guided by the fitting grooves. It enters the inside of 407c and 407d. After that, as shown in FIG. 10B, when the opening / closing cover 209 moves to the closed position, the bearings 406a and 406b abut on the inner wall on the inner side of the fitting grooves 407c and 407d and fit into the fitting grooves 407c and 407d. It is held together.

When the bearing 406a is fitted into the fitting groove 407c, the bearing 406a is urged by the spring 8a toward the back side of the fitting groove 407c. Similarly, when the bearing 406b is fitted into the fitting groove 407d, the bearing 406b is urged by the spring 8b toward the inner side of the fitting groove 407d. When the motor 230 is driven with the bearings 405a and 405b and the bearings 406a and 406b held by the holder member 407, the bearings 405a and 405b and the bearings 406a and 406b are held by the holder member 407 in a non-rotating state. Further, the rotating shaft 255a of the driving gear 255 and the rotating shaft 220a of the driven gear 220 rotate.

As described above, the holder member 407 integrally holds the bearing 405a arranged on one side of the drive gear 255 and the bearing 405b arranged on the other side at a predetermined position with respect to the rotation axis direction of the drive gear 255. Further, with respect to the direction of the rotation axis of the driven gear 220, the bearing 406a arranged on one side of the driven gear 220 and the bearing 406b arranged on the other side are integrally held at predetermined positions. As a result, it is possible to suppress deterioration of the parallelism between the rotating shaft 255a of the drive gear 255 to which the bearings 405a and 405b are attached and the rotating shaft 220a of the driven gear 220 to which the bearings 406a and 406b are attached. Therefore, it is possible to suppress the above-mentioned misalignment error and parallel error between the drive gear 255 and the driven gear 220, and uneven wear and drive transmission error between the drive gear 255 and the driven gear 220. , The generation of abnormal noise can be suppressed.

When the open / close cover 209 is in the closed position, the bearing 406a attached to the rotating shaft 220a of the driven gear 220 is urged by the spring 8a toward the back side of the fitting groove 407c. Similarly, the bearing 406b attached to the rotating shaft 220a of the driven gear 220 is urged by the spring 8b toward the inner side of the fitting groove 407d. As a result, the rotation shaft 220a of the driven gear 220 is restricted from moving in the moving direction from the closed position to the open position of the open / close cover 209. Therefore, when the open / close cover 209 is located in the closed position, the rotation shaft 220a of the driven gear 220 is restricted from moving inside the fitting grooves 407c and 407d. Therefore, deterioration of the parallelism between the rotating shaft 255a of the driving gear 255 and the rotating shaft 220a of the driven gear 220 can be more effectively suppressed.

Further, depending on the influence of the tolerance of the holder member 407, when the opening / closing cover 209 moves from the open position to the closed position, the bearings 406a and 406b are moved to the back side of the fitting grooves 407c and 407d before the opening / closing cover 209 reaches the closed position. It is possible that it will reach the inner wall of the. In this case, the opening / closing cover 209 may not be completely closed. In the present embodiment, the rotating shaft of the driven gear 220 is loosely fitted into a through hole (not shown) of the opening / closing cover 209 to ensure freedom of movement. Therefore, in such a case, the opening / closing cover 209 is in the closed position. You can move towards. Therefore, it is possible to prevent the opening / closing cover 209 from being unable to move to the closed position.

Further, the rotating shaft 220a of the driven gear 220 and the rotating shaft 207a of the transport roller 207 are connected by an old dam joint 256. As a result, it is possible to absorb the declination between the rotating shaft 220a of the driven gear 220 and the rotating shaft 207a of the transport roller 207 generated by the holder member 407.

In this embodiment, the configuration in which the rotary shaft 255a of the drive gear 255 and the rotary shaft 220a of the driven gear 220 are held by the holder member 407 via the bearings 405a and 405b and the bearings 406a and 406b has been described. However, the present invention is not limited to this. That is, in the configuration in which the drive gear 255 and the driven gear 220 are rotatably held with respect to these rotating shafts, the rotating shaft 255a of the driving gear 255 and the rotating shaft 220a of the driven gear 220 are used without using a bearing. It may be configured to be directly held by the holder member 407. In this case, with respect to the rotation axis direction of the drive gear 255, one side portion (first portion) of the drive gear 255 with respect to the drive gear 255 is held by the fitting hole 407a, and the other side portion (second portion) is held. ) Is held in the fitting hole 407b. Further, with respect to the direction of the rotation axis of the driven gear 220, one side portion (third portion) of the driven gear 220 with respect to the driven gear 220 in the rotation shaft 220a is held by the fitting groove 407c, and the other side portion (fourth portion). The portion) is held by the fitting groove 407d. Further, the springs 8a and 8b are provided so as to be in direct contact with the rotating shaft 220a of the driven gear 220. As a result, the same effect as described above can be obtained.

Further, in the present embodiment, the configuration in which the holder member 407 is provided in the housing 50 of the ADF 82 has been described, but the present invention is not limited to this. That is, the holder member 407 may be provided on the opening / closing cover 209. In this case, the bearings 406a and 406b attached to the rotating shaft 220a of the driven gear 220 are fitted into the fitting holes 407a and 407b, respectively. Further, the bearings 405a and 405b attached to the rotating shaft 255a of the drive gear 255 are fitted into the fitting grooves 407c and 407d. As a result, the same effect as described above can be obtained.

(Second Embodiment)
Next, the configuration of the image forming apparatus according to the second embodiment of the present invention will be described. The same reference numerals are given to the parts that overlap with those of the first embodiment, and the description thereof will be omitted.

In the present embodiment, in the drive unit for driving the transport roller 42, the holder member 7 is provided on the right door 11 side, and the spring holding member 58 is provided on the housing 1 side. The configuration other than the drive unit that drives the transfer roller 42 is the same as the configuration of the first embodiment.

FIG. 11 is a perspective view of a drive unit that drives the transfer roller 42 according to the present embodiment. FIG. 12 is a schematic cross-sectional view of the periphery of the holder member 7 according to the present embodiment. Here, FIG. 12A shows a state in which the right door 11 is located in the closed position, and FIG. 12B shows a state in which the right door 11 is located in the open position.

As shown in FIG. 11, a pulley 15 is attached to the rotating shaft of the motor 3 provided in the housing 1. Further, the housing 1 is provided with a drive gear 53. A pulley 17 is attached to the rotating shaft 53a of the drive gear 53. A drive transmission belt 16 is stretched on a pulley 15 attached to the rotating shaft of the motor 3 and a pulley 17 attached to the rotating shaft 53a of the drive gear 53. As a result, the driving force of the motor 3 is transmitted to the drive gear 53 via the drive transmission belt 16.

Further, the transfer roller 42 is supported on the right door 11 as in the first embodiment. A driven gear 54 that meshes with the drive gear 53 when the right door 11 is in the closed position is press-fitted into the rotating shaft 42a of the transport roller 42. That is, in the present embodiment, the rotating shaft of the driven gear 54 is the rotating shaft 42a of the transport roller 42.

Since the transfer roller 42 is supported by the right door 11, when the right door 11 is located in the open position, the driven gear 54 is separated from the drive gear 53, and the drive cannot be transmitted without meshing with each other. Become. On the other hand, when the right door 11 is located in the closed position, the driven gear 54 and the drive gear 53 mesh with each other, and the driving force of the motor 3 is transmitted from the drive gear 53 to the driven gear 54. That is, when the right door 11 is located in the closed position, the driving force of the motor 3 is transmitted to the transfer roller 42 via the drive transmission belt 16, the drive gear 53, and the driven gear 54, and the transfer roller 42 is rotationally driven.

Here, a holder member 7 is provided on the right door 11 in order to suppress deterioration of parallelism between the rotating shaft 53a of the driving gear 53 and the rotating shaft 42a of the driven gear 54. Bearings 6a and 6b attached to the rotating shaft 42a of the driven gear 54 are fitted and held in the fitting holes 7a and 7b of the holder member 7, respectively. In the direction of the rotation axis of the driven gear 54, the bearing 6a is arranged adjacent to the driven gear 54 on one side of the driven gear 54, and the bearing 6b is adjacent to the driven gear 54 on the other side of the driven gear 54. (See FIG. 12).

Bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are fitted and held in the fitting grooves 7c and 7d of the holder member 7, respectively. The fitting grooves 7c and 7d are grooves extending in the rotation direction of the right door 11, respectively. In the direction of the rotation axis of the drive gear 53, the bearing 5a is arranged adjacent to the drive gear 53 on one side of the drive gear 53, and the bearing 5b is arranged adjacent to the drive gear 53 on the other side of the drive gear 53. ..

Further, as shown in FIG. 12, the housing 1 is provided with a spring holding member 58. Bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are fitted into the through holes 58c and 58d of the spring holding member 58. Since the diameters of the through holes 58c and 58d are about 1 mm larger than the diameters of the bearings 5a and 5b, the bearings 5a and 5b are loosely fitted into the through holes 58c and 58d.

Further, the spring 9a held by the spring holding member 58 is in contact with the bearing 5a attached to the rotating shaft 53a of the drive gear 53 and urges the bearing 5a. Similarly, the spring 9b held by the spring holding member 58 is in contact with the bearing 5b attached to the rotating shaft 53a of the drive gear 53 and urges the bearing 5b. When the right door 11 is in the closed position, the spring 9a urges the bearing 5b together with the rotation shaft 53a of the drive gear 53 to the back side of the fitting groove 7c, and the spring 9b urges the bearing 5b to the rotation shaft 53a of the drive gear 53. At the same time, the fitting groove 7d is urged to the back side.

As shown in FIG. 12A, when the right door 11 is in the open position, the bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are separated from the holder member 7, so that the holder member 7 Not held in. On the other hand, the bearings 6a and 6b attached to the rotating shaft 42a of the driven gear 54 are fitted and held in the fitting holes 7a and 7b of the holder member 7. In this state, the drive gear 53 and the driven gear 54 are not meshed with each other.

In the process of moving the right door 11 from the open position to the closed position, the bearings 5a and 5b attached to the rotating shaft 53a of the drive gear 53 are guided by the inner walls of the fitting grooves 7c and 7d, and the fitting grooves 7c , Enters the inside of 7d. After that, as shown in FIG. 12B, when the right door 11 moves to the closed position, the bearings 5a and 5b abut on the inner wall on the inner side of the fitting grooves 7c and 7d and fit into the fitting grooves 7c and 7d. It is held together. When the bearing 5a is fitted into the fitting groove 7c, the bearing 5a is urged by the spring 9a toward the inner side of the fitting groove 7c. Similarly, when the bearing 5b is fitted into the fitting groove 7d, the bearing 5b is urged by the spring 9b toward the inner side of the fitting groove 7d.

In this way, the holder member 7 integrally holds the bearing 5a arranged on one side of the drive gear 53 and the bearing 5b arranged on the other side at a predetermined position with respect to the rotation axis direction of the drive gear 53. Further, with respect to the direction of the rotation axis of the driven gear 54, the bearing 6a arranged on one side of the driven gear 54 and the bearing 6b arranged on the other side are integrally held at predetermined positions. As a result, deterioration of the parallelism between the rotating shaft 53a of the drive gear 53 to which the bearings 5a and 5b are attached and the rotating shaft 42a of the driven gear 54 to which the bearings 6a and 6b are attached can be suppressed. Therefore, it is possible to suppress the above-mentioned misalignment error and parallel error between the drive gear 53 and the driven gear 54, and uneven wear and drive transmission error between the drive gear 53 and the driven gear 54. , The generation of abnormal noise can be suppressed.

When the right door 11 is in the closed position, the bearing 4a attached to the rotating shaft 53a of the drive gear 53 is urged toward the back side of the fitting groove 7c by the spring 9a. Similarly, the bearing 5b attached to the rotating shaft 53a of the drive gear 53 is urged by the spring 9b toward the inner side of the fitting groove 7d. As a result, the rotation shaft 53a of the drive gear 53 is restricted from moving in the moving direction from the closed position to the open position of the right door 11. Therefore, when the right door 11 is in the closed position, the rotation shaft 53a of the drive gear 53 is restricted from moving inside the fitting grooves 7c and 7d, and the rotation shaft 53a of the drive gear 53 and the driven gear 54 rotate. Deterioration of the parallelism of the shaft 42a can be suppressed more effectively.

Further, depending on the influence of the tolerance of the holder member 7, when the right door 11 moves from the open position to the closed position, the bearings 5a and 5b are placed on the back side of the fitting grooves 7c and 7d before the right door 11 reaches the closed position. There is a risk that the right door 11 will not be completely closed because it reaches the inner wall of the door. In the present embodiment, the diameters of the through holes 58c and 58d are about 1 mm larger than the diameters of the bearings 5a and 5b. Therefore, in such a case, the right door 11 moves about 1 mm together with the spring holding member 58 toward the closed position. be able to. Therefore, it is possible to prevent the right door 11 from being unable to move to the closed position.

Further, in the present embodiment, since the driven gear 54 is pivotally supported by the rotating shaft 42a of the transport roller 42, the number of members supported by the right door 11 is smaller than that in the first embodiment, and the entire right door 11 is The weight is getting smaller. This makes it easier for the user to open and close the right door 11, and usability can be improved.

In the first and second embodiments, a torsion coil spring is used as an urging member for urging the rotating shaft 54a of the driven gear 54, and the urging member for urging the rotating shaft 54a of the driven gear 54. The configuration using the compression coil spring was described. However, the present invention is not limited to this. That is, the same effect as described above can be obtained even if another spring, rubber, or the like is used as the urging member.

1 ... Housing 3 ... Motor 7 ... Holder member (holding member)
7a ... Fitting hole (first fitting hole)
7b ... Fitting hole (second fitting hole)
7c ... Fitting groove (first groove)
7d ... Fitting groove (second groove)
8a ... Spring (first urging member)
8b ... Spring (second urging member)
9a ... Spring (first urging member)
9b ... Spring (second urging member)
11 ... Right door (rotating member)
50 ... Housing 53 ... Drive gear (first gear)
53a ... Rotation axis (rotation axis of the first gear)
54 ... Driven gear (second gear)
54a ... Rotation axis (rotation axis of the second gear)
58 ... Spring holding member (other holding member)
58c ... Through hole (first hole)
58d ... Through hole (second hole)
80 ... Image reader 209 ... Open / close cover (rotating member)
220 ... Driven gear (second gear)
230 ... Motor 255 ... Drive gear (1st gear)
407 ... Holder member (holding member)
407a ... Fitting hole (first fitting hole)
407b ... Fitting hole (second fitting hole)
407c ... Fitting groove (first groove)
407d ... Fitting groove (second groove)
A ... Image forming device

Claims (17)

The motor provided in the housing of the image forming device and
A first gear having a rotating shaft, the rotating shaft being pivotally supported by the housing, and rotating by the driving force of the motor.
A first bearing attached to the rotation shaft of the first gear and arranged on one side of the first gear in the direction of the rotation axis of the first gear, and a second bearing arranged on the other side.
A second gear having a rotating shaft, meshing with the first gear, and transmitting the driving force of the motor through the first gear to rotate.
The housing so that the second gear can be attached and the first position where the first gear and the second gear mesh with each other and the second position where the second gear is separated from the first gear can be taken. A rotating member that can rotate with respect to the body,
A third bearing attached to the rotation shaft of the second gear and arranged on one side of the second gear in the direction of the rotation axis of the second gear, and a fourth bearing arranged on the other side.
A holding member provided in the housing and integrally holding the first bearing and the second bearing, which is formed on the movement locus of the third bearing accompanying the rotation of the rotating member. The rotation in which the third bearing enters when the rotating member moves from the second position to the first position and holds the third bearing when the rotating member is located in the first position. A first groove extending in the rotation direction of the member and a movement locus of the fourth bearing accompanying the rotation of the rotating member are formed, and the rotating member moves from the second position to the first position. A holding member having a second groove portion extending in the rotation direction of the rotating member, which holds the fourth bearing when the fourth bearing enters and the rotating member is located at the first position. When,
When the rotating member is located at the one position, the first urging member that urges the third bearing toward the inner side of the first groove portion, and
A second urging member that urges the fourth bearing toward the back side of the second groove when the rotating member is located at the one position.
An image forming apparatus comprising. The rotating member has a diameter larger than the diameter of the third bearing and has a diameter larger than that of the first hole into which the third bearing is loosely fitted and the fourth bearing, and the fourth bearing is loosely fitted. The image forming apparatus according to claim 1, wherein the image forming apparatus has a second hole. The first hole and the second hole are formed in the rotating member, and the first urging member, the second urging member, the third bearing, and the fourth bearing are integrally formed. The image forming apparatus according to claim 2, further comprising another holding member for holding. The image forming apparatus according to any one of claims 1 to 3, wherein the first urging member and the second urging member are torsion coil springs. The holding member is any one of claims 1 to 4, wherein the holding member has a first fitting hole into which the first bearing is fitted and a second fitting hole into which the second bearing is fitted. The image forming apparatus according to. The image forming apparatus according to any one of claims 1 to 5, wherein the second gear is supported by the rotating member and transmits a driving force for rotationally driving a transport roller that conveys the seat. .. The motor provided in the housing of the image forming device and
A first gear having a rotating shaft, the rotating shaft being pivotally supported by the housing, and rotating by the driving force of the motor.
A first bearing attached to the rotation shaft of the first gear and arranged on one side of the first gear in the direction of the rotation axis of the first gear, and a second bearing arranged on the other side.
A second gear having a rotating shaft, meshing with the first gear, and transmitting the driving force of the motor through the first gear to rotate.
The housing so that the second gear can be attached and the first position where the first gear and the second gear mesh with each other and the second position where the second gear is separated from the first gear can be taken. A rotating member that can rotate with respect to the body,
A third bearing attached to the rotation shaft of the second gear and arranged on one side of the second gear in the direction of the rotation axis of the second gear, and a fourth bearing arranged on the other side.
A holding member provided on the rotating member that integrally holds the third bearing and the fourth bearing, and the first position when the rotating member moves from the second position to the first position. A first groove extending in the rotation direction of the rotating member, which holds the first bearing when the one bearing enters and the rotating member is positioned at the first position, and the rotating member are the second. The second bearing enters when moving from the position to the first position, and extends in the rotational direction of the rotating member that holds the second bearing when the rotating member is located at the first position. A holding member having a second groove portion,
When the rotating member is located at the one position, the first urging member that urges the first bearing toward the inner side of the first groove portion, and
A second urging member that urges the second bearing toward the back side of the second groove when the rotating member is located at the one position.
An image forming apparatus comprising. The rotating member has a diameter larger than the diameter of the first bearing and has a diameter larger than that of the first hole and the second bearing into which the first bearing is loosely fitted. The image forming apparatus according to claim 7, wherein the image forming apparatus has a second hole. The first hole and the second hole are formed in the housing, and the first urging member, the second urging member, the first bearing, and the second bearing are integrally held. The image forming apparatus according to claim 8, further comprising another holding member. The image forming apparatus according to any one of claims 7 to 9, wherein the first urging member and the second urging member are torsion coil springs. One of claims 7 to 10, wherein the holding member has a first fitting hole into which the third bearing is fitted and a second fitting hole into which the fourth bearing is fitted. The image forming apparatus according to. The image forming apparatus according to any one of claims 7 to 11, wherein the second gear is supported by the rotating member and transmits a driving force for rotationally driving a transport roller that conveys the seat. .. The motor provided in the housing of the image reader and
A first gear having a rotating shaft, the rotating shaft being pivotally supported by the housing, and rotating by the driving force of the motor.
A first bearing attached to the rotation shaft of the first gear and arranged on one side of the first gear in the direction of the rotation axis of the first gear, and a second bearing arranged on the other side.
A second gear having a rotating shaft, meshing with the first gear, and transmitting the driving force of the motor through the first gear to rotate.
The housing so that the second gear can be attached and the first position where the first gear and the second gear mesh with each other and the second position where the second gear is separated from the first gear can be taken. A rotating member that can rotate with respect to the body,
A third bearing attached to the rotation shaft of the second gear and arranged on one side of the second gear in the direction of the rotation axis of the second gear, and a fourth bearing arranged on the other side.
A holding member provided in the housing and integrally holding the first bearing and the second bearing, which is formed on the movement locus of the third bearing accompanying the rotation of the rotating member. The rotation in which the third bearing enters when the rotating member moves from the second position to the first position and holds the third bearing when the rotating member is located in the first position. A first groove extending in the rotation direction of the member and a movement locus of the fourth bearing accompanying the rotation of the rotating member are formed, and the rotating member moves from the second position to the first position. A holding member having a second groove portion extending in the rotation direction of the rotating member, which holds the fourth bearing when the fourth bearing enters and the rotating member is located at the first position. When,
When the rotating member is located at the one position, the first urging member that urges the third bearing toward the inner side of the first groove portion, and
A second urging member that urges the fourth bearing toward the back side of the second groove when the rotating member is located at the one position.
An image reading device comprising. The rotating member has a diameter larger than the diameter of the rotating shaft of the second gear, and has a first hole in the rotating shaft of the second gear on which one side of the rotating shaft with respect to the second gear is loosely fitted, and the first hole. The image according to claim 13, wherein the diameter is larger than the rotation shaft of the two gears, and the portion of the rotation shaft of the second gear on the other side of the second gear has a second hole for loose fitting. Reader. The image forming apparatus according to claim 13 or 14, wherein the first urging member and the second urging member are compression coil springs. One of claims 13 to 15, wherein the holding member has a first fitting hole into which the first bearing is fitted and a second fitting hole into which the second bearing is fitted. The image forming apparatus according to. The image forming apparatus according to any one of claims 13 to 16, wherein the second gear is supported by the rotating member and transmits a driving force for rotationally driving a transport roller that conveys the seat. ..

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