JP5325836B2 - Drive motor holding device and image forming apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability when assembling a drive motor to a drive motor holding device while keeping high assembling accuracy. <P>SOLUTION: A drive motor holding device 100 in an image forming device comprises a storage portion 120 capable of storing a motor body portion 301; a rear end rib portion 130 formed so as to be positioned at a predetermined interval in a fore-and-aft direction to a rear end surface 303 of the drive motor 300 while the motor body portion 301 is stored in the storage portion 120; a first contacting portion 142 extending from a part near a tip end portion of the rear end rib portion 130 to the storage portion 120 side in the rear end rib portion 130 so as to contact with an upper side surface 304a opposite to the storage portion 120 side in a cylindrical portion 304; and a second contacting portion 146 formed at the rear end rib portion 130 so as to be positioned on the storage portion 120 side rather than the rear end rib portion 130 so as to contact with the rear end surface 303 of the drive motor 300. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a drive motor holding device and an image forming apparatus including the drive motor holding device.

  In general, an image forming apparatus such as a copier, a printer, or a facsimile machine includes a plurality of image carriers (photosensitive drums), a developer that converts an electrostatic latent image formed on the image carrier into a toner image, A transfer unit that transfers the toner image formed on the image carrier to a transfer material such as paper; and a fixing unit that fixes the toner image transferred to the transfer material to the transfer material.

  Various drive motors are installed in the image forming apparatus. Various drive motors are held by a drive motor holding device provided in the apparatus main body of the image forming apparatus.

  Image forming apparatuses are required to have high image quality and low price. With these demands, a drive motor can be easily installed in the drive motor holding device while maintaining high accuracy of the assembly dimensions of the drive motor. A structure to be assembled is required.

  Conventionally, in order to maintain high assembly accuracy, the drive motor holding device has a screw fixing hole at a predetermined position of the drive motor holding device, and the drive motor also has a screw fixing hole at a predetermined position of the drive motor. The drive motor is assembled to the drive motor holding device through screws through both screw holes (see Patent Document 1).

JP 2006-171411 A

  In assembling the drive motor, for example, in order to mesh the worm gear provided on the output shaft of the drive motor and the worm wheel gear provided rotatably on the base portion of the drive motor holding device, The motor main body may be rotated around the output shaft. However, in the drive motor holding device described in Patent Document 1, since the drive motor is held only with screws, the drive motor is released when the screws are loosened. Therefore, since the motor main body of the drive motor can hardly be rotated around the output shaft while maintaining the holding of the drive motor, the work of assembling the drive motor is required.

  An object of the present invention is to provide a drive motor holding device capable of improving workability of assembling the drive motor to the drive motor holding device while maintaining high assembly accuracy.

  Another object of the present invention is to provide an image forming apparatus provided with the drive motor holding device.

  The present invention provides a drive motor including a motor main body, an output shaft disposed on one side of the motor main body, and a cylindrical cylindrical portion formed on a rear end surface which is the other side surface of the motor main body. A drive motor holding device in an image forming apparatus for holding, wherein a base portion, a housing portion formed in the base portion and capable of housing the motor body portion, and the motor body portion being housed in the housing portion A rear end rib portion formed on the base portion so as to be positioned with a predetermined gap in the front-rear direction in which the output shaft extends with respect to the rear end surface of the drive motor in a state; and the motor main body portion The rear end rib in the front-rear direction from the vicinity of the front end portion of the rear end rib portion so as to be able to contact the upper side surface that is the side surface opposite to the storage portion side in the cylindrical portion in a state where the rear end rib is accommodated in the housing portion. A first contact portion extending toward the housing portion and a rear end surface of the drive motor in a state in which the motor main body portion is housed in the housing portion, in the front-rear direction, than the rear end rib portion. The present invention relates to a drive motor holding device in an image forming apparatus, comprising: a second contact portion formed on the rear end rib portion so as to be positioned on the housing portion side.

  It is preferable that the motor main body has an edge portion extending in the front-rear direction around the rear end surface, and the predetermined gap is larger than the length of the edge portion in the front-rear direction.

  It is preferable that an insertion hole into which the cylindrical portion can be inserted is formed in the rear end rib portion, and the first contact portion is formed in the vicinity of the opening of the insertion hole.

  It is preferable that the base portion has a through hole formed on the housing portion side of the rear end rib portion in the front-rear direction.

  The motor main body has a recess formed in a front end surface that is one side surface of the motor main body, and the drive motor holding device further includes the rear of the housing portion in the front-rear direction of the base. A front end rib portion formed on the side opposite to the end rib portion; and the recess formed in the housing portion side in the front-rear direction of the front end rib portion and the motor main body portion being housed in the housing portion. And a hook portion to be engaged.

  The present invention also provides one or more image carriers on which electrostatic latent images are formed on the surface, and a developer for developing a toner image on the electrostatic latent images formed on the one or more image carriers. A transfer unit that directly or indirectly transfers a toner image formed on the image carrier to a transfer material; a fixing unit that fixes the toner image transferred to the transfer material to the transfer material; The present invention relates to an image forming apparatus including a drive motor holding device in the image forming apparatus described above.

ADVANTAGE OF THE INVENTION According to this invention, the drive motor holding | maintenance apparatus which can improve the workability | operativity which assembles a drive motor to a drive motor holding | maintenance apparatus can be provided, maintaining a high assembly | attachment precision.
In addition, according to the present invention, an image forming apparatus including the drive motor holding device can be provided.

FIG. 3 is a diagram for explaining an arrangement of each component of the printer 1 which is an embodiment of the image forming apparatus of the present invention. FIG. 2 is a partial perspective view of a drive motor holding device 100 assembled to the apparatus main body M of the printer 1 shown in FIG. 1. It is the fragmentary perspective view which made a part of drive motor holding device 100 shown in Drawing 2 into a section. FIG. 4 is an enlarged view of a partial cross section of the drive motor holding device 100 shown in FIG. 3. FIG. 4 is a partial perspective view in which another part of the drive motor holding device 100 shown in FIG. 2 is enlarged. It is a fragmentary perspective view explaining the procedure which assembles the drive motor 300 to the drive motor holding | maintenance apparatus 100 shown in FIG. It is a perspective view of the drive motor 300 assembled | attached to the drive motor holding | maintenance apparatus 100 shown in FIG. It is a fragmentary perspective view of another embodiment of the drive motor holding device of the present invention. It is a fragmentary perspective view of another embodiment of the drive motor holding | maintenance apparatus of this invention.

Hereinafter, embodiments of an image forming apparatus of the present invention will be described with reference to the drawings.
The overall structure of the printer 1 as the image forming apparatus of the first embodiment will be described with reference to FIG. FIG. 1 is a front view for explaining the arrangement of each component in the printer 1 as the first embodiment of the present invention.

  In the following description, when viewed from the user standing on the front side of the printer 1, the left-right direction is the direction of the arrow X, the loading direction is the direction of the arrow Z, and the direction perpendicular to the arrow X and the arrow Z is the front-back direction (depth). The direction.

<Printer>
As shown in FIG. 1, a printer 1 as an image forming apparatus includes an apparatus main body M, an image forming unit GK that forms a toner image on a sheet T as a sheet-like transfer material based on predetermined image information, A paper supply / discharge unit KH that supplies the paper T to the image forming unit GK and discharges the paper T on which the toner image is formed.

  The outer shape of the apparatus main body M is configured by a case body BD as a casing.

  As shown in FIG. 1, the image forming unit GK includes photosensitive drums 2a, 2b, 2c, and 2d as image carriers (photosensitive members), charging units 10a, 10b, 10c, and 10d, and a laser as an exposure unit. Scanner units 4a, 4b, 4c, 4d, developing devices 16a, 16b, 16c, 16d, toner cartridges 5a, 5b, 5c, 5d, toner supply units 6a, 6b, 6c, 6d, drum cleaning unit 11a, 11b, 11c, 11d, static eliminators 12a, 12b, 12c, 12d, intermediate transfer belt 7, primary transfer rollers 37a, 37b, 37c, 37d, secondary transfer roller 8, counter roller 18, fixing Part 9.

  As shown in FIG. 1, the paper feed / discharge unit KH includes a paper feed cassette 52, a manual paper feed unit 64, a conveyance path L for paper T, a registration roller pair 80, a plurality of rollers or roller pairs, A paper unit 50. As will be described later, the transport path L is an aggregate of a first transport path L1, a second transport path L2, a third transport path L3, a manual transport path La, and a return transport path Lb.

Hereinafter, each configuration of the image forming unit GK and the paper supply / discharge unit KH will be described in detail.
<Image forming unit>
First, the image forming unit GK will be described.
In the image forming unit GK, the charging units 10a, 10b, 10c, and 10d are sequentially applied to the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d in order as the photosensitive drums 2a, 2b, 2c, and 2d rotate during image formation. Charging by 10d, exposure by laser scanner units 4a, 4b, 4c and 4d, development by developing devices 16a, 16b, 16c and 16d, primary transfer by intermediate transfer belt 7 and primary transfer rollers 37a, 37b, 37c and 37d, Static elimination by the static eliminators 12a, 12b, 12c, and 12d and cleaning by the drum cleaning units 11a, 11b, 11c, and 11d are performed.

  Further, in the image forming unit GK, secondary transfer by the intermediate transfer belt 7, the secondary transfer roller 8 and the counter roller 18, and fixing by the fixing unit 9 are performed.

  Each of the photosensitive drums 2a, 2b, 2c, and 2d is formed of a cylindrical member and functions as a photosensitive member or an image carrier. Each of the photosensitive drums 2a, 2b, 2c, and 2d is rotatable in the direction of the arrow shown in FIG. 1 around a rotation axis that extends in a direction (front-rear direction) orthogonal to the traveling direction of the intermediate transfer belt 7. Has been placed. An electrostatic latent image can be formed on the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d.

  Each of the charging units 10a, 10b, 10c, and 10d is disposed to face the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d. Each of the charging units 10a, 10b, 10c, and 10d uniformly charges the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d to be positive (plus polarity).

  The laser scanner units 4a, 4b, 4c, and 4d function as exposure units, and are spaced apart from the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d. Each of the laser scanner units 4a, 4b, 4c, and 4d includes a laser light source (not shown), a polygon mirror, a polygon mirror driving motor, and the like.

  Each of the laser scanner units 4a, 4b, 4c, and 4d scans and exposes the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d based on image information input from an external device such as a PC (personal computer). The scanning exposure is performed by each of the laser scanner units 4a, 4b, 4c, and 4d, thereby removing the charges on the exposed portions of the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d. Thereby, electrostatic latent images are formed on the respective surfaces of the photosensitive drums 2a, 2b, 2c, and 2d.

  The developing units 16a, 16b, 16c, and 16d are provided corresponding to the photosensitive drums 2a, 2b, 2c, and 2d, respectively, and are disposed to face the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d. . Each of the developing units 16a, 16b, 16c, and 16d attaches toner of each color to a portion where the electrostatic charge image formed on the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d is removed, Color toner images are formed on the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d. Each of the developing devices 16a, 16b, 16c, and 16d corresponds to four colors of yellow, cyan, magenta, and black. Each of the developing devices 16a, 16b, 16c, and 16d includes a developing roller disposed opposite to the surface of the photosensitive drums 2a, 2b, 2c, and 2d, a stirring roller for stirring the toner, and the like.

  Each of the toner cartridges 5a, 5b, 5c, and 5d is provided corresponding to each of the developing devices 16a, 16b, 16c, and 16d, and each color toner supplied to each of the developing devices 16a, 16b, 16c, and 16d. To accommodate. Each of the toner cartridges 5a, 5b, 5c, and 5d accommodates yellow toner, cyan toner, magenta toner, and black toner.

  The toner supply units 6a, 6b, 6c, and 6d are provided corresponding to the toner cartridges 5a, 5b, 5c, and 5d and the developing devices 16a, 16b, 16c, and 16d, respectively. The toners of the respective colors accommodated in 5d are supplied to the developing devices 16a, 16b, 16c, and 16d, respectively. Each of the toner supply units 6a, 6b, 6c, and 6d is connected to each of the developing devices 16a, 16b, 16c, and 16d by a toner conveying device (not shown).

  To the intermediate transfer belt 7, the toner images of the respective colors formed on the photosensitive drums 2a, 2b, 2c, and 2d are sequentially primary-transferred. The intermediate transfer belt 7 is stretched over a driven roller 35, a counter roller 18 that functions as a driving roller, a tension roller 36, and the like. Since the tension roller 36 biases the intermediate transfer belt 7 from the inside to the outside, a predetermined tension is applied to the intermediate transfer belt 7.

  Primary transfer rollers 37a, 37b, 37c, and 37d are arranged to face each other on the side opposite to the photosensitive drums 2a, 2b, 2c, and 2d with the intermediate transfer belt 7 interposed therebetween.

  The intermediate transfer belt 7 is sandwiched between the primary transfer rollers 37a, 37b, 37c, and 37d and the photosensitive drums 2a, 2b, 2c, and 2d, respectively. The sandwiched portion is pressed against the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d. Primary transfer nips N1a, N1b, N1c, and N1d are formed between the photosensitive drums 2a, 2b, 2c, and 2d and the primary transfer rollers 37a, 37b, 37c, and 37d, respectively. In the primary transfer nips N1a, N1b, N1c, and N1d, the toner images of the respective colors formed on the photoreceptor drums 2a, 2b, 2c, and 2d are sequentially primary-transferred onto the intermediate transfer belt 7, respectively. As a result, a full-color toner image is formed on the intermediate transfer belt 7.

  To the primary transfer rollers 37a, 37b, 37c, and 37d, toner images of the respective colors formed on the photosensitive drums 2a, 2b, 2c, and 2d are respectively transferred to the intermediate transfer belt 7 by a primary transfer bias applying unit (not shown). A primary transfer bias for transferring the toner image is applied.

  The static eliminators 12a, 12b, 12c, and 12d are arranged to face the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d, respectively. The static eliminators 12a, 12b, 12c, and 12d respectively irradiate the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d to irradiate light, and the photosensitive drums 2a, 2b, and 2c after the primary transfer is performed. 2d, each surface is neutralized (charge is removed).

  Each of the drum cleaning units 11a, 11b, 11c, and 11d is disposed to face the surface of each of the photosensitive drums 2a, 2b, 2c, and 2d. Each of the drum cleaning units 11a, 11b, 11c, and 11d removes toner and adhering matter remaining after the primary transfer on the surfaces of the photosensitive drums 2a, 2b, 2c, and 2d, and removes the removed toner and the like to a predetermined level. It is transported to the collection mechanism and collected.

  The secondary transfer roller 8 secondarily transfers the full-color toner image primarily transferred to the intermediate transfer belt 7 onto the paper T. A secondary transfer bias for transferring the full color toner image formed on the intermediate transfer belt 7 to the paper T is applied to the secondary transfer roller 8 by a secondary transfer bias applying unit (not shown).

  The secondary transfer roller 8 contacts or separates from the intermediate transfer belt 7. Specifically, the secondary transfer roller 8 is configured to be movable between a contact position where the secondary transfer roller 8 is in contact with the intermediate transfer belt 7 and a spaced position where the secondary transfer roller 8 is separated from the intermediate transfer belt 7. Specifically, the secondary transfer roller 8 is disposed at a contact position when the full-color toner image primarily transferred onto the surface of the intermediate transfer belt 7 is secondarily transferred to the paper T, and in other cases. It is arranged at a separated position.

  A counter roller 18 is disposed on the opposite side of the intermediate transfer belt 7 from the secondary transfer roller 8. The intermediate transfer belt 7 is sandwiched between the secondary transfer roller 8 and the opposing roller 18. Then, the paper T is pressed against the outer surface of the intermediate transfer belt 7 (the surface on which the toner image is primarily transferred). A secondary transfer nip N <b> 2 is formed between the intermediate transfer belt 7 and the secondary transfer roller 8. At the secondary transfer nip N2, the full-color toner image primarily transferred to the intermediate transfer belt 7 is secondarily transferred to the paper T.

  The fixing unit 9 melts and presses the toner of each color constituting the toner image secondarily transferred onto the paper T and fixes the toner on the paper T. The fixing unit 9 includes a heating rotator 9a heated by a heater and a pressure rotator 9b pressed against the heating rotator 9a. The heating rotator 9a and the pressure rotator 9b sandwich and pressurize the paper T onto which the toner image has been secondarily transferred, and convey the paper T. When the paper T is conveyed while being sandwiched between the heating rotator 9a and the pressure rotator 9b, the toner transferred to the paper T is fixed on the paper T by being melted and pressurized. Is done.

<Feeding and discharging section>
Next, the paper supply / discharge unit KH will be described.
As shown in FIG. 1, a paper feed cassette 52 that stores paper T is disposed below the apparatus main body M. The paper feed cassette 52 is configured to be able to be pulled out from the case body BD of the apparatus main body M in the horizontal direction. In the paper feed cassette 52, a placement plate 60 on which the paper T is placed is disposed. In the paper feed cassette 52, the paper T is stored in a state of being stacked on the placement plate 60. The placement plate 60 is lifted so that the end of the paper T (the right end in FIG. 1) comes into contact with a forward feed roller 61 described later. The paper T placed on the placement plate 60 is sent out to the transport path L by the cassette paper feed unit 51 disposed at the paper feed side end of the paper feed cassette 52 (the right end in FIG. 1). ing. The cassette paper feeding unit 51 includes a forward feed roller 61 for taking out the paper T on the placement plate 60 and a paper feed roller pair 81 for feeding the paper T one by one to the transport path L. Is provided.

  The drive motor 300 that exerts a driving force for lifting the mounting plate 60 will be described in detail later.

  A manual paper feed unit 64 is provided on the right side surface (right side in FIG. 1) of the apparatus main body M. The manual paper feed unit 64 is provided mainly for supplying paper T having a size and type different from the paper T set in the paper feed cassette 52 to the apparatus main body M. The manual paper feed unit 64 includes a manual feed tray 65 that forms part of the right side surface of the apparatus main body M in the closed state, and a paper feed roller 66. The lower end of the manual feed tray 65 is assembled in the vicinity of the paper feed roller 66 so as to be rotatable (openable and closable). The paper T is placed on the open manual feed tray 65. The paper feed roller 66 feeds the paper T placed on the open manual feed tray 65 to the manual feed path La.

  The conveyance path L for conveying the paper T includes a first conveyance path L1 from the cassette paper feeding unit 51 to the secondary transfer nip N2, a second conveyance path L2 from the secondary transfer nip N2 to the fixing unit 9, and a fixing unit. 9 to the paper discharge unit 50, the manual conveyance path La for joining the paper supplied from the manual paper feed unit 64 to the first conveyance path L1, and the third conveyance path L3 from the downstream side to the upstream side. And a return conveyance path Lb for reversing the sheet conveyed to the side and returning it to the first conveyance path L1.

  Moreover, the 1st junction part P1 and the 2nd junction part P2 are provided in the middle of the 1st conveyance path L1. A first branch portion Q1 is provided in the middle of the third transport path L3.

The first joining part P1 is a joining part where the manual feed path La joins the first transport path L1. The second junction P2 is a junction where the return conveyance path Lb merges with the first conveyance path L1.
The first branch portion Q1 is a branch portion where the return transport path Lb branches from the third transport path L3.
In the middle of the first conveyance path L1 (specifically, between the second joining portion P2 and the secondary transfer nip N2), a paper detection sensor (not shown) for detecting the paper T, A registration roller pair 80 is arranged for adjusting the timing with skew (oblique feeding) correction and toner image formation in the image forming unit GK. The paper detection sensor is disposed immediately before the registration roller pair 80 in the transport direction of the paper T (upstream in the transport direction). The registration roller pair 80 conveys the paper T by performing the above-described correction and timing adjustment based on detection signal information from the paper detection sensor.

  An intermediate roller pair 82 is disposed between the first joining portion P1 and the second joining portion P2 in the first transport path L1. The intermediate roller pair 82 is disposed on the downstream side in the paper transport direction with respect to the paper feed roller pair 81, sandwiches the paper T transported from the paper feed roller pair 81, and transports the paper T to the registration roller pair 80.

  The return conveyance path Lb is a conveyance path provided in order to make the opposite surface (unprinted surface) opposite to the already printed surface to the intermediate transfer belt 7 when performing duplex printing on the paper T. By the return conveyance path Lb, the paper T conveyed from the first branching section Q1 to the paper discharge section 50 side is reversed and returned to the first conveyance path L1, and is disposed on the upstream side of the secondary transfer roller 8. It can be conveyed to the upstream side of the roller pair 80. A toner image is transferred to the non-printed surface of the paper T that has been turned upside down by the return conveyance path Lb in the secondary transfer nip N2.

  A rectifying member 58 is provided in the first branch portion Q1. The rectifying member 58 rectifies the transport direction of the paper T that is carried out of the fixing unit 9 and transports the third transport path L3 from the upstream side toward the downstream side in a direction toward the paper discharge unit 50 and the paper discharge unit 50. The conveyance direction of the paper T that is conveyed from the downstream side toward the upstream side of the third conveyance path L3 is rectified in a direction toward the return conveyance path Lb.

  A paper discharge unit 50 is formed at the end of the third transport path L3. The paper discharge unit 50 is disposed on the upper part of the apparatus main body M. The paper discharge unit 50 opens toward the left side of the apparatus main body M (left side in FIG. 1). The paper discharge unit 50 discharges the paper T to the outside of the apparatus main body M. The paper discharge unit 50 includes a discharge roller pair 53. The discharge roller pair 53 discharges the paper T conveyed from the upstream side to the downstream side in the third conveyance path L3 to the outside of the apparatus main body M, and reverses the conveyance direction of the paper T in the paper discharge unit 50. The paper T can be transported toward the upstream side of the third transport path L3.

On the opening side of the paper discharge unit 50, a paper discharge stacking unit M1 is formed. The paper discharge stacking unit M1 is formed on the upper surface (outer surface) of the apparatus main body M. The paper discharge stacking unit M1 is a part formed by the upper surface of the apparatus main body M being depressed downward. The bottom surface of the paper discharge stacking unit M1 constitutes a part of the top surface of the apparatus main body M. In the paper discharge stacking unit M1, sheets T formed with a predetermined toner image and discharged from the paper discharge unit 50 are stacked and stacked.
A paper detection sensor (not shown) is disposed at a predetermined position on each conveyance path.

<Description of Operation of Printer 1>
Next, the operation of the printer 1 of the first embodiment will be briefly described with reference to FIG.
First, a case where single-sided printing is performed on the paper T stored in the paper feed cassette 52 will be described.
The paper T accommodated in the paper feed cassette 52 is sent out to the first transport path L1 by the forward feed roller 61 and the paper feed roller pair 81, and then intermediated via the first joining portion P1 and the first transport path L1. It is conveyed to the registration roller pair 80 by the roller pair 82.

  In the registration roller pair 80, skew correction of the paper T and timing adjustment with toner image formation in the image forming unit GK are performed.

  The paper T discharged from the registration roller pair 80 is introduced between the intermediate transfer belt 7 and the secondary transfer roller 8 (secondary transfer nip N2) via the first conveyance path L1. A toner image is transferred onto the paper T between the intermediate transfer belt 7 and the secondary transfer roller 8.

  Thereafter, the paper T is discharged from between the intermediate transfer belt 7 and the secondary transfer roller 8, and is interposed between the heating rotator 9a and the pressure rotator 9b in the fixing unit 9 via the second conveyance path L2. Introduced into the fixing nip. Then, the toner melts in the fixing nip, and the toner is fixed on the paper T.

  Next, the paper T is transported to the paper discharge unit 50 through the third transport path L3, and is discharged from the paper discharge unit 50 to the paper discharge stacking unit M1 by the discharge roller pair 53.

In this way, single-sided printing of the paper T stored in the paper feed cassette 52 is completed.
When single-sided printing is performed on the paper T placed on the manual feed tray 65, the paper T placed on the manual feed tray 65 is sent out to the manual feed path La by the paper feed roller 66, and then the first joining portion. It is conveyed to the registration roller pair 80 via P1 and the first conveyance path L1. Subsequent operations are the same as the one-side printing operation of the paper T accommodated in the paper feed cassette 52 described above, and a description thereof will be omitted.

<Description of Operation of Printer 1 for Duplex Printing>
Next, the operation of the printer 1 when performing duplex printing will be described.
In the case of single-sided printing, as described above, the paper T on which single-sided printing has been performed is discharged from the paper discharge unit 50 to the paper discharge stacking unit M1, and the printing operation is completed.

  On the other hand, when performing double-sided printing, the paper T on which single-sided printing has been performed is reversed from the time of single-sided printing and conveyed again to the registration roller pair 80 via the return conveyance path Lb. Then, double-sided printing is performed on the paper T.

  More specifically, the operation is the same as the above-described single-sided printing operation until the paper T on which single-sided printing has been performed is discharged from the paper discharge unit 50 by the discharge roller pair 53. Thus, in the case of double-sided printing, in a state where the paper T on which single-sided printing has been performed is held by the discharge roller pair 53, the rotation of the discharge roller pair 53 is stopped and rotated in the reverse direction. When the discharge roller pair 53 is thus rotated in the reverse direction, the paper T held by the discharge roller pair 53 moves in the reverse direction (the direction from the paper discharge unit 50 toward the first branching unit Q1) along the third conveyance path L3. ).

  As described above, when the paper T is transported in the reverse direction on the third transport path L3, the paper T is rectified to the return transport path Lb by the rectifying member 58, and then, via the second junction P2. Then, it joins the first transport path L1. Here, the paper T is turned upside down from the one-side printing.

  Further, the paper T is corrected or adjusted by the registration roller pair 80, and is introduced into the secondary transfer nip N2 through the first conveyance path L1. Since the unprinted surface of the sheet T passes through the return conveyance path Lb and faces the intermediate transfer belt 7, the toner image is transferred to the unprinted surface, and as a result, duplex printing is performed.

<Drive motor holding device>
Next, details of the drive motor holding device 100 and the drive motor 300 held by the drive motor holding device 100 will be described with reference to FIGS.
FIG. 2 is a partial perspective view of the drive motor holding device 100 assembled to the apparatus main body M of the printer 1 shown in FIG. FIG. 3 is a partial perspective view of the drive motor holding device 100 shown in FIG. 4 is an enlarged view of a partial cross section of the drive motor holding device 100 shown in FIG. FIG. 5 is an enlarged partial perspective view of another part of the drive motor holding device 100 shown in FIG. FIG. 6 is a partial perspective view for explaining a procedure for assembling the drive motor 300 to the drive motor holding apparatus 100 shown in FIG. FIG. 7 is a perspective view of the drive motor 300 assembled to the drive motor holding device 100 shown in FIG.

  In the following description, as shown in FIG. 7, in the direction in which the output shaft 308 of the drive motor 300 extends, the output shaft 308 side of the motor main body 301 is defined as the front direction F, and the direction opposite to the front direction F is the rear direction. B. As shown in FIG. 3, a direction in which the motor body 301 is assembled is an assembly direction D, and a direction opposite to the assembly direction D is a removal direction U. Further, the front direction F and the rear direction B are collectively referred to as the front-rear direction, and the assembly direction D and the removal direction U are collectively referred to as the attachment / detachment direction.

  As shown in FIG. 1, the drive motor holding device 100 is disposed below the mounting plate 60 in the apparatus main body M (in the direction of the arrow Z). The drive motor holding device 100 holds the drive motor 300 in a detachable manner. The drive motor 300 operates to lift the mounting plate 60 in the apparatus main body M.

  As shown in FIGS. 2 to 4, the drive motor holding device 100 includes a base part 110, a housing part 120, a rear end rib part 130, a first contact part 142, a second contact part 146, and a front end rib. Part 180 and a hook part 190. A through hole 170 is formed in the base part 110.

<Drive motor>
First, the drive motor 300 that is assembled and held in the drive motor holding device 100 will be described.
As shown in FIG. 7, the drive motor 300 includes a motor body 301, an output shaft 308, and a cylindrical portion 304 (see FIG. 6). The motor main body 301 includes a cylindrical outer peripheral surface 305, a front end surface 302 that is one side (front side F side) of the motor main body 301, and a rear side that is the other side (rear direction B side) of the motor main body 301. An end face 303, an edge portion 306 (see FIG. 6), a convex portion 309, and a concave portion 310 are provided.

  The motor main body 301 has a substantially cylindrical shape. In the motor main body 301, one side (front direction F side) is a front end surface 302, and the other side (rear direction B side) is a rear end surface 303.

  The cylindrical outer peripheral surface 305 is formed in a columnar shape having a height Lm between the front end surface 302 and the rear end surface 303.

  The edge portion 306 has a shape extending in the rear direction B from the periphery of the rear end surface 303. The edge portion 306 has a cylindrical shape having an outer diameter substantially the same as the outer diameter of the column side surface of the motor main body portion 301.

The convex portion 309 is formed in a cylindrical shape at the center of the front end surface 302. An output shaft 308 extends from the center of the convex portion 309.
The recess 310 is formed in the front end surface 302 that is one side surface of the motor main body 301. The recess 310 is formed so as to engage with the hook portion 190 in a state where the motor main body portion 301 is placed on the housing portion 120 of the drive motor holding device 100 (described later).

The output shaft 308 is disposed on one side (front side F side) of the motor main body 301.
A worm gear 307 is assembled to the output shaft 308 so as not to be relatively rotatable.
The worm gear 307 is assembled to the output shaft 308 so as to mesh with a worm wheel 401 (described later) in a state where the motor main body 301 is accommodated in the accommodating portion 120 of the drive motor holding device 100.

  The cylindrical portion 304 has a cylindrical shape extending in the rear direction B at the center of the rear end surface 303. In the cylindrical portion 304, a side surface (side surface on the removal direction U side) opposite to the accommodating portion 120 side of the cylindrical portion 304 in a state where the motor main body portion 301 is accommodated in the accommodating portion 120 is referred to as an upper side surface 304a (see FIG. 4). To do.

<Each configuration of the drive motor holding device>
Next, each configuration of the drive motor holding device 100 will be described.
<Base part>
The base part 110 will be described.
As shown in FIG. 2, the base portion 110 includes a base plate-like portion 111, a plurality of rib portions 112 that reinforce the plate-like portion 111, a plurality of worm wheels 401, and the like, and a plurality of support portions that rotatably support the base portion 110. 113 and the like. The base part 110 is integrally formed of, for example, an elastic resin material.

  Further, when the base part 110 is formed of a resin material, the base part 110 is a snap-fit part that holds the motor main body part 301 of the drive motor 300 in order to reduce the number of assembly steps when the drive motor 300 is attached. (Not shown).

<Container>
Next, the accommodating part 120 is demonstrated.
As shown in FIG. 2, the accommodating portion 120 is formed in the base portion 110 so that the motor main body portion 301 can be accommodated.
As shown in FIG. 6, the accommodating portion 120 includes an opening that is open on the removal direction U side so that the motor main body 301 can be accommodated from the position on the removal direction U side in the base portion 110.

As shown in FIG. 6, the accommodating portion 120 includes a cylindrical inner side surface 121 having an inner diameter that is approximately the same as the outer diameter of the cylindrical side surface of the motor main body 301. The cylindrical inner side surface 121 of the housing part 120 is substantially in surface contact with the lower side (the assembly direction D side) of the cylindrical outer peripheral surface 305 of the motor main body part 301 in a state where the motor main body part 301 is housed in the housing part 120. A base portion 110 is provided.
As shown in FIG. 3, the accommodating portion 120 has a through-hole 170 penetrating in the attaching / detaching direction (the assembling direction D and the detaching direction U) on the rear end rib portion 130 side (rear direction B side) of the bottom of the cylindrical inner surface 121. Is formed.

<Rear end rib>
Next, the rear end rib part 130 will be described.
As shown in FIG. 3, the rear end rib portion 130 includes a plate-shaped base portion 131 that extends in the removal direction U from the base portion 110, and a restriction portion 140 that is integrally formed near the tip of the base portion 131. An insertion hole 160 penetrating in the front-rear direction (front direction F and rear direction B) is formed in the vicinity of the front end of the rear end rib portion 130. The base portion 131 of the rear end rib portion 130 has an inner side surface 132 on the accommodating portion 120 side (front side F side) in the rear end rib portion 130. The restricting portion 140 is formed on the accommodating portion 120 side (front direction F side) in the rear end rib portion 130.

<First contact part>
Next, the first contact portion will be described.
As shown in FIG. 4, the first contact portion 142 constitutes a part of the insertion hole 160. In other words, the first contact portion 142 is formed on the removal direction U side of the inner side surface of the insertion hole 160.
The first contact portion 142 has a cylindrical side surface shape extending in the front-rear direction (front direction F and rear direction B). The inner diameter of the first contact portion 142 is configured to be larger than the outer diameter of the cylindrical portion 304. Therefore, the first contact portion 142 is formed so as to be able to contact the upper side surface 304 a of the cylindrical portion 304 in a state where the motor main body portion 301 is accommodated in the accommodating portion 120.
The first contact portion 142 extends from the vicinity of the front end portion of the rear end rib portion 130 (near the front end side (removing direction U side) of the base portion 131 and the vicinity of the assembling direction D side of the restricting portion 140). It extends to the 120 side (front direction F side). That is, the first contact portion 142 is formed on the base portion 131 of the rear end rib portion 130 and the restriction portion 140 formed in the vicinity of the front end portion of the base portion 131.

<Second contact portion>
Next, the second contact portion will be described.
As shown in FIG. 4, the second contact portion 146 is formed on the accommodating portion 120 side (front direction F side) of the restricting portion 140.
The second contact portion 146 is formed to be able to contact the rear end surface 303 of the drive motor 300 in a state where the motor main body portion 301 is accommodated in the accommodating portion 120. Specifically, the second contact portion 146 is located at the rear end rib such that the second contact portion 146 is positioned closer to the housing portion 120 (front side F side) than the rear end rib portion 130 in the front-rear direction (front direction F and rear direction B). The restriction portion 140 of the portion 130 is formed.
The inner side surface 132 of the rear end rib portion 130 is formed so as to place a predetermined gap δ in the rear direction B with respect to the rear end surface 303 of the drive motor 300. The predetermined gap δ is larger than the length h in the front-rear direction of the edge portion 306 of the drive motor 300. Therefore, the inner side surface 132 of the rear end rib portion 130 does not contact the rear end surface 303 and the edge portion 306 of the drive motor 300 in a state where the motor main body portion 301 is accommodated in the accommodating portion 120.

<Front end rib part>
Next, the front end rib portion will be described.
As shown in FIG. 6, the front end rib portion 180 is formed on the opposite side (front direction F) from the rear end rib portion 130 of the housing portion 120 in the front-rear direction (front direction F and rear direction B) of the base portion 110. ing. The front end rib portion 180 and the rear end rib portion 130 are integrally formed so as to extend toward the removal direction U in the base portion 110.
The front end rib portion 180 includes an inner side surface 184, a slit 182, and a hook portion 190.
As shown in FIG. 3, the inner side surface 184 is formed so as to come into contact with the front end surface 302 of the motor main body 301 when the motor main body 301 is accommodated in the accommodating portion 120. The inner side surface 184 is formed at a position of the dimension W from the second contact portion 146 of the rear end rib portion 130. The dimension W is substantially equal to the height Lm (see FIG. 7) of the motor main body 301.
As shown in FIG. 6, the slit 182 has a shape that penetrates in the front-rear direction (front direction F and rear direction B) of the front end rib portion 180 and opens toward the removal direction U.
As shown in FIG. 3, the slit 182 is formed so that the convex portion 309 can enter the removal direction U side of the front end rib portion 180 in a state where the motor main body portion 301 is accommodated in the accommodation portion 120. .

<Hook part>
Next, the hook part 190 will be described.
As shown in FIG. 6, the hook portion 190 is formed on the accommodating portion 120 side (rear direction B side) in the front-rear direction of the front end rib portion 180. The hook portion 190 is formed on the front end rib portion 180 so as to engage with the concave portion 310 in a state where the motor main body portion 301 is accommodated in the accommodating portion 120. Accordingly, the concave portion 310 and the hook portion 190 function as a positioning hole and a boss, respectively.

<Drive motor assembly procedure>
Next, a procedure for assembling and holding the drive motor 300 in the drive motor holding device 100 will be described. In the assembly procedure, first, a mounting step of mounting on the motor main body 301 of the drive motor 300 is performed, and then a rotation step of slightly rotating the motor main body 301 around the output shaft 308 is performed. Hereinafter, the assembly procedure of the drive motor will be described in detail.

<State before housing motor main body 301 in housing>
First, as shown in FIG. 6, the worker arranges the drive motor 300 at a position on the removal direction U side in the housing portion 120 of the base portion 110. At this time, the operator holds the motor main body 301 so that the rear direction B side of the motor main body 301 is slightly lowered.
Next, the operator moves the motor main body 301 to be substantially parallel to the side of the housing part 120 (side in the assembly direction D). At this time, since the motor body 301 is slightly lowered in the rear direction B side of the motor main body 301, first, the edge portion 306 on the rear direction B side of the motor main body 301 is removed in the direction U of removing the through hole 170. Touch the opening.
At this time, a part of the edge portion 306 on the side of the assembly direction D enters the inside of the through-hole 170. Therefore, the position of the cylindrical portion 304 of the motor main body 301 in the attachment / detachment direction (assembly direction D and removal direction U) is the insertion hole. The position is slightly lower than the position of 160. And the position of the front-end | tip of the cylindrical part 304 in the front-back direction (front direction F and back direction B) is located in the opening vicinity of the front direction F side of the penetration hole 160. FIG.

<State (Mounting Step) when Motor Main Body 301 is Mounted on Storage Unit 120>
Furthermore, when the operator moves the motor main body 301 in the assembly direction D, the rear direction B side and the front direction F side of the motor main body 301 are in the state described below.

<State of the motor body 301 on the rear direction B side>
On the rear direction B side of the motor main body 301, the front end of the cylindrical portion 304 is inserted into the insertion hole 160, and the rear end surface 303 contacts the second contact portion 146. This will be described in detail below.
The motor main body portion 301 that has been lowered in the rear direction B side is inclined so that the motor main body portion 301 is substantially parallel to the housing portion 120. That is, in the attachment / detachment direction (assembly direction D and removal direction U), the position of the end portion on the front direction F side of the motor main body 301 is lowered so as to be the same as the position of the end portion on the rear direction B side.
At this time, as shown in FIGS. 3 and 4, the front end of the cylindrical portion 304 of the motor main body 301 is inserted into the insertion hole 160 of the rear end rib 130, and the rear end surface 303 of the motor main body 301 is The rear end surface 303 comes into contact with the second contact portion 146 before moving slightly in the rear direction B. That is, when the cylindrical portion 304 is inserted through the insertion hole 160, the motor main body 301 is not movable in the attaching / detaching direction, but is rotatably held by the rear end rib portion 130.
At this time, the operator is in a state in which the cylindrical portion 304 is inserted into the insertion hole 160 through the through hole 170 that passes through the housing portion 120 in the attaching / detaching direction (the assembling direction D and the removing direction U). It can be visually recognized. Further, the heat generated in the vicinity of the cylindrical portion 304 due to the operation of the drive motor 300 escapes in the assembling direction D of the base portion 110 through the through hole 170.

<State of motor main body 301 on front side F>
On the front direction F side of the motor main body 301, the convex portion 309 is disposed between the slits 182. This will be described in detail below.
When the motor main body 301 that has been lowered in the rear direction B is tilted so as to be substantially parallel to the housing portion 120, the convex portion 309 formed on the front end surface 302 of the motor main body 301 is moved in the assembling direction D side. Come on. As shown in FIG. 3, the convex portion 309 is disposed between the slits 182 formed in the front end rib portion 180. Thereby, the convex part 309 can hardly move in a direction (direction perpendicular to the attaching / detaching direction and the front-rear direction) perpendicular to the direction in which the slit 182 is opened (removing direction U). However, the motor main body 301 can rotate around the output shaft 308. That is, the motor main body 301 is rotatably held around the output shaft 308. Accordingly, the protrusion 309 is positioned between the slits 182 so that the protrusion 309 is positioned with respect to the front end rib portion 180.

<State of Motor Body 301 after Placement (Rotation Step)>
Next, the worker rotates the drive motor 300 around the output shaft 308. As a result, the concave portion 310 formed in the motor main body 301 moves on a circle centering on the output shaft 308, and eventually the hook portion 190 of the front end rib portion 180 enters the concave portion 310. Thereby, the rotation of the motor body 301 around the output shaft 308 is restricted, and the drive motor 300 is held by the drive motor holding device 100.
At this time, since the predetermined gap δ is larger than the height h of the edge portion 306, the tip of the edge portion 306 does not contact the second contact portion 146. For this reason, the operator can easily rotate the motor main body 301 around the output shaft 308.
Further, there may be an error in the dimension of the motor body 301 in the front-rear direction and an error in the formation position of the rear end rib portion 130. In such a case, there is almost no predetermined gap δ between the rear end surface 303 of the motor main body 301 and the rear end rib portion 130. However, since the rear end rib portion 130 is elastically deformed in the front-rear direction (front direction F and rear direction B), the error in the front-rear direction (front direction F and rear direction B) of the motor body 301 is absorbed.

  According to the drive motor holding device 100 described above, the output shaft 308 extends in the front-rear direction (front direction) with respect to the base portion 110, the storage portion 120 that can store the motor main body portion 301, and the rear end surface 303 of the drive motor 300. F and the rear end rib portion 130 formed on the base portion 110 so as to be positioned with a predetermined gap δ in the rear direction B) and the upper side surface that is the side surface opposite to the accommodating portion 120 side in the cylindrical portion 304. The first contact portion 142 extending from the vicinity of the front end portion of the rear end rib portion 130 toward the housing portion 120 side in the rear end rib portion 130 and the rear end surface 303 of the drive motor 300 can be contacted so as to be able to contact 304a. And a second contact part 146 formed on the rear end rib part 130 so as to be positioned closer to the accommodating part 120 than the rear end rib part 130 in the front-rear direction. For this reason, since the upper side surface 304a and the rear end surface 303 of the drive motor 300 are in contact with the first contact portion 142 and the second contact portion 146, respectively, the positioning accuracy of the motor main body 301 can be maintained high.

  Further, even when the motor main body 301 has the edge portion 306 extending in the front-rear direction around the rear end surface 303, the predetermined gap δ is larger than the length of the edge portion 306 in the front-rear direction. The edge portion 306 does not contact the second contact portion 146. Therefore, the operator can easily rotate the motor main body 301 around the output shaft 308.

  In addition, the rear end rib portion 130 is formed with an insertion hole 160 through which the cylindrical portion 304 can be inserted, and the first contact portion 142 is formed in the vicinity of the opening of the insertion hole 160. Is not movable in the attaching / detaching direction, but is held by the rear end rib portion 130 so as to be rotatable.

  Moreover, since the base part 110 has the through-hole 170 formed in the accommodating part 120 side (front direction F side) of the rear-end rib part 130 in the front-back direction, an operator penetrates the accommodating part 120 in the attachment / detachment direction. The state in which the cylindrical portion 304 is inserted into the insertion hole 160 can be visually recognized through the through-hole 170 that is formed. Further, the heat generated in the vicinity of the cylindrical portion 304 due to the operation of the drive motor 300 can be released in the assembling direction D of the base portion 110 through the through hole 170.

  The drive motor holding device 100 further includes a front end rib portion 180 formed on the opposite side of the rear end rib portion 130 of the housing portion 120 in the front-rear direction of the base portion 110, and a housing portion 120 in the front-rear direction of the front end rib portion 180. And a hook portion 190 that is formed on the side (rear direction B side) and engages with the recess 310 in a state where the motor main body portion 301 is accommodated in the accommodation portion 120. For this reason, when the motor main body 301 is rotated around the output shaft 308, the hook 190 of the front end rib 180 enters the recess 310 before long. Thereby, the rotation of the motor body 301 around the output shaft 308 is restricted, and the drive motor 300 can be assembled and held in the drive motor holding device 100.

<Another drive motor holding device>
Next, another drive motor holding device 100a will be described.
FIG. 8 is a partial perspective view of another embodiment of the drive motor holding device of the present invention.
As shown in FIG. 8, another drive motor holding device 100 a is the same as the drive motor holding device 100 except that the shape of the rear end rib portion 130 a is different from the shape of the rear end rib portion 130 of the drive motor holding device 100. Therefore, only the differences will be described below.
The rear end rib portion 130 a has a restricting portion 140 a near the tip of the base portion 131. The restricting portion 140a has a plurality of convex portions 148 on the side surface 147 on the accommodating portion 120 side. The plurality of convex portions 148 have a truncated quadrangular pyramid shape. The top part of the convex part 148 has a shape capable of approximately line contact (contact with a small area) with the rear end face 303. The convex portion 148 is integrally formed with the restricting portion 140 a in the vicinity of the opening of the insertion hole 160.

Next, the state of the drive motor holding device 100a when the drive motor 300 is assembled to the drive motor holding device 100a (placement step) will be described.
When the operator moves the motor main body 301 in the rear direction B on the rear end rib portion 130 a side, the rear end surface 303 of the motor main body 301 substantially contacts the tops of the plurality of convex portions 148. Therefore, the tops of the plurality of convex portions 148 act as second contact portions.
As described above, the top portions of the plurality of convex portions 148 are in substantially line contact with the rear end surface 303, so that the rotational resistance of the motor main body portion 301 can be reduced. For this reason, since the operator can rotate the motor main body 301 with a small force, the assembly work of the drive motor can be facilitated.

<Another drive motor holding device>
Next, another drive motor holding device 100b will be described.
FIG. 9 is a partial perspective view of still another embodiment of the drive motor holding device of the present invention.
As shown in FIG. 9, yet another drive motor holding device 100 b is different from the drive motor holding device 100 except that the shape of the rear end rib portion 130 b is different from the shape of the rear end rib portion 130 of the drive motor holding device 100. Since they are the same, only the differences will be described below.
The rear end rib portion 130 b has a restricting portion 140 b near the tip of the base portion 131. The restricting portion 140b has a U-shaped convex portion 148b on the side surface 147 on the accommodating portion 120 side. The cross-sectional shape in the front-rear direction (front direction F and rear direction B) of the U-shaped convex portion 148b has a trapezoidal shape. The top portion of the U-shaped convex portion 148 has a shape that allows a substantially line contact (contact with a small area) to the rear end surface 303. The U-shaped convex portion 148 b is formed integrally with the restricting portion 140 b in the vicinity of the opening of the insertion hole 160.

Next, the state of the drive motor holding device 100b when the drive motor 300 is assembled to the drive motor holding device 100b (placement step) will be described.
When the operator moves the motor main body 301 in the rear direction B on the rear end rib portion 130b side, the rear end surface 303 of the motor main body 301 is brought into substantially line contact with the top of the convex portion 148b. Therefore, the top part of the convex part 148b acts as a second contact part.
As described above, since the convex portion 148b is in substantially line contact with the rear end surface 303, the rotational resistance of the motor main body 301 can be reduced. For this reason, since the operator can rotate the motor main body 301 with a small force, the assembly work of the drive motor can be facilitated.
Furthermore, since the shape of the portion where the convex portion 148b is in contact with the rear end surface 303 is a semicircular shape larger than the outer shape of the cylindrical portion 304, the stability of the contact can be ensured.

<Other embodiments>
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various forms can be adopted.
The type of the image forming apparatus of the present invention is not particularly limited, and may be a copier, a printer, a facsimile, or a complex machine thereof.
The drive motor held by the drive motor holding mechanism of the present invention has been described as a motor that moves the mounting plate 60 up and down. However, the drive motor is not limited to this, and the pair of paper feed rollers 81, the photosensitive drums 2a, 2b, 2c, and 2d. , Laser scanner units 4a, 4b, 4c, 4d, developing devices 16a, 16b, 16c, 16d, toner cartridges 5a, 5b, 5c, 5d, toner supply units 6a, 6b, 6c, 6d, drum cleaning units 11a, 11b, 11c, 11d, static eliminators 12a, 12b, 12c, 12d, intermediate transfer belt 7, primary transfer rollers 37a, 37b, 37c, 37d, intermediate transfer belt 7, secondary transfer roller 8, heating rotator 9a, or heating member A motor that rotationally drives the pressure rotator 9b or a motor that rotationally drives other members may be used.

  DESCRIPTION OF SYMBOLS 1 ... Printer (image forming apparatus), 100, 100a, 100b ... Drive motor holding device, 110 ... Base part, 120 ... Storage part, 121 ... Cylindrical inner surface, 130, 130a, 130b ... Rear end Rib part 131... Base part 132... Inner side surface of rear end rib part 140, 140 a, 140 b ...... Restriction part 142 ...... First contact part 146 ...... Second contact part 148 148 b. Convex part (convex part having second contact part), 160 ... insertion hole, 170 ... through hole, 180 ... front end rib part, 190 ... hook part, 300 ... drive motor, 301 ... motor body part , 302... Front end surface, 303... Rear end surface, 304... Cylindrical portion, 304 a... Upper side surface, 305. 310 …… Recess

Claims (6)

An image that holds a drive motor that includes a motor main body, an output shaft arranged on one side of the motor main body, and a cylindrical cylindrical portion formed on a rear end surface that is the other end surface of the motor main body. A drive motor holding device in the forming apparatus,
A base part;
An accommodating portion formed in the base portion and capable of accommodating the motor body portion;
Formed in the base portion such that the motor main body portion is positioned with a predetermined gap in the front-rear direction in which the output shaft extends with respect to the rear end surface of the drive motor in a state of being accommodated in the accommodation portion. A rear end rib portion,
From the vicinity of the front end portion of the rear end rib portion in the front-rear direction so as to be able to come into contact with the upper side surface that is the side surface opposite to the housing portion side in the cylindrical portion in a state where the motor main body portion is housed in the housing portion. A first contact portion extending toward the accommodating portion in the rear end rib portion;
The rear end rib so as to be positioned closer to the housing portion than the rear end rib portion in the front-rear direction so as to be able to contact the rear end surface of the drive motor in a state where the motor main body portion is housed in the housing portion. A drive motor holding device in the image forming apparatus, comprising: a second contact portion formed on the portion. The motor main body has an edge portion extending in the front-rear direction around the rear end surface,
The drive motor holding device in the image forming apparatus according to claim 1, wherein the predetermined gap is larger than a length of the edge portion in the front-rear direction. The rear end rib portion is formed with an insertion hole through which the cylindrical portion can be inserted,
The drive motor holding device in the image forming apparatus according to claim 1, wherein the first contact portion is formed in the vicinity of the opening of the insertion hole.   4. The drive motor holding device in an image forming apparatus according to claim 1, wherein the base portion has a through hole formed on the housing portion side of the rear end rib portion in the front-rear direction. The motor main body has a recess formed on a front end surface which is one side surface of the motor main body,
The drive motor holding device further includes a front end rib portion formed on a side opposite to the rear end rib portion of the housing portion in the front-rear direction of the base portion,
The hook part which is formed in the said accommodating part side in the said front-back direction of the said front end rib part, and engages with the said recessed part in the state in which the said motor main-body part was accommodated in the said accommodating part. A drive motor holding device in the image forming apparatus according to claim 1. One or more image carriers on which electrostatic latent images are formed; and
A developer for developing a toner image on the electrostatic latent image formed on the one or more image carriers;
A transfer unit that directly or indirectly transfers the toner image formed on the image carrier to a transfer material;
A fixing unit for fixing the toner image transferred to the transfer material to the transfer material;
An image forming apparatus comprising: a drive motor holding device in the image forming apparatus according to claim 1.

Images