JP3892706B2 - Photosensitive drum holding apparatus, electrophotographic recording apparatus, and copying apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a photosensitive drum holding device having a flywheel that suppresses rotation unevenness generated on a photosensitive drum by its inertial mass, an electrophotographic recording apparatus including the same, and a copying apparatus.
[0002]
[Prior art]
Conventionally, in this type of photosensitive drum holding device and electrophotographic recording apparatus and copying apparatus equipped with the photosensitive drum, the photosensitive drum rotates at a constant speed via a transmission means such as a gear, a timing belt, and an electromagnetic clutch. To form an image.
[0003]
However, since the gear meshes the teeth and transmits the rotation, the speed fluctuation occurs due to the meshing of the teeth with each other, and as a result, the photosensitive drum may be unevenly rotated. In addition, due to disturbance factors such as load fluctuations, rotation irregularities may be induced in the rotation of the motor itself.
[0004]
In order to prevent such rotation unevenness, a weight called a flywheel is attached to the shaft of the photosensitive drum, and the rotation unevenness is suppressed by the inertial mass of the flywheel. The flywheel has a disk shape and has a certain weight. The flywheel is fixed to the photosensitive drum by fixing a flange into which the shaft of the photosensitive drum is fitted at the center.
[0005]
Specifically, the D-cut shape parallel to the axial direction is applied to the axial end portion of the photosensitive drum. On the other hand, an inner peripheral portion that matches the D-cut shape of the shaft of the photosensitive drum is provided at the center of the flange. By inserting the shaft end portion of the photosensitive member into the inner peripheral portion of the flange, the rotation of the shaft of the photosensitive drum is transmitted to the inner peripheral portion provided on the flange, and the flange is rotated. And since the flange is being fixed to the flywheel, rotation of a flange will rotate a flywheel.
[0006]
FIG. 8 is an enlarged view of a main part of a conventional photosensitive drum holding device. FIG. 8 is an enlarged view of a connecting portion between a shaft and a flange of a conventional photosensitive drum holding device.
[0007]
As shown in the drawing, a shaft 803 of the photosensitive drum is fitted into a flange 802 fixed to the flywheel 801. Then, the screw 804 is inserted from the hole portion of the flange 802 formed at a position corresponding to the screw hole provided at the end portion of the shaft 803 of the photosensitive drum, and the flywheel 801 and the shaft 803 of the photosensitive drum are fixed. And are fixed. When the flywheel 801 and the photosensitive drum shaft 803 are fixed in this manner, a load is generated in the direction of the photosensitive drum shaft 803 due to factors such as the weight of the flywheel 801, and all of this load is applied to the screw 804. As means for absorbing this load, for example, locking members 805A and 805B such as spring washers are inserted between the screw 804 and the flange 802 and between the flange 802 and the shaft 803 of the photosensitive drum.
[0008]
[Problems to be solved by the invention]
However, this conventional technique has the following problems.
[0009]
That is, as described above, the locking members 805A and 805B are inserted between the screw 804 and the flange 802 and between the flange 802 and the photosensitive drum shaft 803. For this reason, the operation of fixing the flywheel 801 to the shaft 803 of the photosensitive drum by screwing is performed by first facing the end surface of the photosensitive drum shaft 803 with the screw hole facing upward, and the first loosening prevention thereon. A member 805B is placed, a flange 802 with a flywheel 801 attached thereon is placed thereon, a second locking member 805A is placed thereon, and in that state, a screw 804 is inserted and fixed from above.
[0010]
In the course of this work, the first locking member 805B is located between the photosensitive drum shaft 803 and the flywheel 801. The flywheel 801 positioned above is a disk-shaped member having a large diameter, and the end surface of the shaft 803 of the photosensitive drum positioned below is a plane having a small diameter. There is a problem that it is extremely difficult to stably hold the first locking member 805B between the shaft 803 and the shaft 803.
[0011]
In particular, since the flywheel 801 is a heavy member, the hand is placed under the heavy member having a large diameter, and the screw 804 is rotated and inserted while holding the first locking member 805B. The work is extremely complicated.
[0012]
The present invention has been made in view of the above problems, and provides a photosensitive drum holding device, an electrophotographic recording apparatus, and a copying apparatus that can easily perform the operation of fixing the shaft of the photosensitive drum to a flywheel. With the goal.
[0013]
[Means for Solving the Problems]
The present invention separates a flange for transmitting rotation of a drive shaft of a photosensitive drum to a flywheel into a flange and a flange cap fitted to the flange, and a screw head and flange cap for fixing the flange to the drive shaft. The flange is fixed to the drive shaft while the first locking member is sandwiched between the flange cap and the drive shaft while the second locking member is sandwiched between the flange cap and the drive shaft.
[0014]
As a result, the first locking member and the second locking member do not come off during the screwing operation, so there is no need to hold and hold the first locking member or the second locking member by hand. The operation of screwing the foil onto the drive shaft of the photosensitive drum can be facilitated.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  The photosensitive drum holding device according to the first aspect of the present invention includes a driving shaft that can be coaxially engaged with the photosensitive drum and having a screw hole on an end surface thereof, and the photosensitive drum that is held coaxially with the driving shaft. The flywheel that suppresses the rotation unevenness by the inertial mass, and is fixed to the center of the flywheel.A hole that fits into the shaft end of the drive shaft;Transmits rotation of the drive shaft to the flywheelAnd having a groove at the screw hole side end.A flange,A flange cap having a hole in the substantially central portion, and after fitting the hole portion of the flange to the shaft end portion of the drive shaft, a loosening prevention member is provided between the flange cap and the drive shaft end surface. The flange is inserted into the groove portion of the flange, and a screw is inserted into the hole of the flange cap through another loosening prevention member and screwed into the screw hole on the end surface of the drive shaft. To fixTake the configuration.
[0016]
  According to this configuration,A flange having a hole fixed to the center of the flywheel and fitted to the shaft end of the drive shaft, having a groove at the end, and a flange cap having a hole at the substantially center. The portion is fitted to the shaft end portion of the drive shaft. As a result, in the assembly work, the flange and the flange cap can be separated, and the flange fixed to the flywheel can be attached to the drive shaft first, so there is no work to be performed while holding a large and heavy flywheel, It has the effect that workability is good.
[0017]
  Further, after the hole of the flange is fitted to the shaft end of the drive shaft, a loosening prevention member is inserted between the flange cap and the drive shaft end surface to be fitted into the groove of the flange. As a result, the locking member is sandwiched between the end face of the drive shaft and the flange cap, so that it does not come off in the process of screwing, so the screwing work can be easily done without holding the locking member by hand. Can do.
[0018]
  Furthermore, the flange is fixed to the drive shaft by inserting a screw into the hole of the flange cap through another loosening prevention member and screwing it into the screw hole of the end surface of the drive shaft. As a result, the other locking members do not come off during the screwing operation, so that the screwing operation can be easily performed without holding and holding the locking members by hand.
[0019]
  According to a second aspect of the present invention, in the photosensitive drum holding device according to the first aspect, the flange cap has irregularities on an outer periphery, and the flange cap is fitted to the flange.The grooveThe structure which has the unevenness | corrugation corresponding to the said unevenness | corrugation in the inner periphery is taken.
[0020]
When the outer circumference of the flange cap fitted to the inner circumference of the flange is a circle with no irregularities, the flange and screw rotate in conjunction with this rotation due to the rotation of the photosensitive drum. Since it only touches the inside of the flange, it idles inside the flange. Therefore, a force is applied to the screw to rotate by the shaft of the photosensitive drum, while a conflicting force is applied from the flange cap to stop the screw, causing a load on the screw and loosening the screw.
[0021]
  According to the second aspect of the present invention, an unevenness is provided on the outer periphery of the flange cap,GrooveBy providing irregularities corresponding to the irregularities on the inner circumference, when the photosensitive drum rotates, the irregularities of the flange cap can be engaged with the irregularities of the flange and the flange cap can be prevented from idling inside the flange. Therefore, it is possible to prevent the screws from loosening due to conflicting forces.
[0022]
  According to a third aspect of the present invention, in the photosensitive drum holding device according to the first aspect, the flange is fitted into the shaft end portion of the drive shaft through the hole portion of the flange to house the shaft end portion. A storage portion, and a groove portion into which the flange cap is fitted at an end portion of the storage portion; the flange cap is ring-shaped, and has a convex shape toward a peripheral surface of the storage portion; The ring shape is fitted, and a configuration having a concave shape that accommodates the convex shape is taken.
[0023]
  According to this configuration, when the photosensitive drum is rotated by providing irregularities on the outer periphery of the flange cap, and providing irregularities corresponding to the irregularities on the inner periphery of the groove portion of the flange, the irregularities of the flange cap become flanged. It is possible to prevent the flange cap from slipping inside the flange by meshing with the unevenness of the screw, so that it is possible to prevent the screw from loosening due to an opposite force applied to the screw.
[0024]
  According to a fourth aspect of the present invention, in the photosensitive drum holding device according to any one of the first to third aspects, a first rotation stop hole is provided on the surface of the flywheel, and the first rotation stop hole is further described. And a bracket for storing a drive source for transmitting power to the drive shaft. When the flywheel is screwed to the drive shaft, the first rotation stop hole is provided on the bracket. The structure which provided the 2nd rotation blind hole into which the said rod member which let it pass is taken.
[0025]
  According to this configuration, when the flywheel is screwed to the shaft of the photosensitive drum, the rod member passes through the first rotation stop hole of the flywheel and the second rotation stop hole of the bracket, so that the flywheel rotates. By stopping the operation, it is possible to prevent the flywheel from being pulled and rotated when the screw is turned, so that the screw can be pushed to the end without pressing the flywheel by hand.
[0026]
  The electrophotographic recording apparatus according to the fifth aspect of the present invention employs a configuration having the photosensitive drum holding apparatus according to any one of the first to fourth aspects.
[0027]
  With this configuration, the electrophotographic recording apparatus has the same effects as any one of the first to fourth aspects.
[0028]
  A copying apparatus according to a sixth aspect of the present invention employs a configuration having the photosensitive drum holding device according to any one of the first to fourth aspects.
[0029]
  With this configuration, the copying apparatus has the same effect as any of the first to fourth aspects.
[0042]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0043]
FIG. 1 is a schematic configuration diagram of an electrophotographic recording apparatus 100 to which a photosensitive drum holding device according to an embodiment of the present invention is applied. The electrophotographic recording apparatus 100 functions as a copying apparatus. As shown in FIG. 1, the electrophotographic recording apparatus 100 includes a reading unit 101 that reads a document at the top, and a main unit 102 that performs paper feeding, transfer, recording, and fixing processes below the reading unit 101.
[0044]
A paper feed cassette 103 is installed at the bottom of the main unit 102. The uppermost sheet is taken out by the pickup roller 104 from the sheet bundle set in the sheet feeding cassette 103.
[0045]
The paper taken out from the paper feed cassette 103 is fed by a paper feed roller 105 into a paper path 106 formed upward from the bottom of the main unit 102. In the paper path 106, a plurality of transport rollers 107, 108, and 109 are disposed as a paper transport means in the paper transport device according to the present invention. The transport rollers 107, 108, and 109 are configured to be replaceable by opening an opening / closing cover of the main unit 102 (not shown).
[0046]
The sheet conveyed by the uppermost conveying roller 109 is transferred to the registration roller 111 by the conveying roller 110. A photosensitive drum 112 that rotates in the direction of the arrow in the drawing is disposed at the sheet conveyance destination by the registration roller 111. The photosensitive drum 112 is held on its side by the photosensitive drum holding device according to the present invention.
[0047]
Above the photosensitive drum 112, an LSU (Laser Scan Unit) 113 that forms a latent image on the surface of the photosensitive drum 112 is disposed. A developing device 114 for adhering developer (toner) to the latent image formed on the photosensitive drum 112 is disposed adjacent to the photosensitive drum 112. The developing device 114 includes a stirring roller that stirs and conveys the developer and a developing roller that adheres the developer to the photosensitive drum 112.
[0048]
Below the photoconductive drum 112, a transfer device 115 is installed for transferring an image formed by the developer adhering to the photoconductive drum 112 onto the conveyed paper. The registration roller 111 controls the position adjustment between the image on the photosensitive drum 112 and the recording area of the paper.
[0049]
A cleaning unit 116 that cleans the surface of the photosensitive drum 112 that has finished transferring the image is disposed adjacent to the photosensitive drum 112. The sheet on which the image has been transferred is further transported by the transport belt 117. A fixing unit 118 is disposed at the conveyance destination of the conveyance belt 117.
[0050]
The fixing unit 118 includes a fixing roller 119 and a pressure roller 120 disposed to face the fixing roller 119. The fixing roller 119 applies heat to the recording surface of the paper, and the pressure roller 120 presses the paper against the fixing roller 119, whereby the image is fixed on the paper.
[0051]
The sheet discharged from the fixing unit 118 is discharged outside the main body unit 102 by the discharge roller 121. The paper discharged from the main unit 102 is received on the paper discharge tray 122.
[0052]
Between the fixing unit 118 and the discharge roller 121, a switching guide 124 for switching whether to discharge the sheet to the outside of the main unit 102 or to send the sheet to the duplex path 123 for performing duplex recording is disposed. The double-sided path 123 includes a portion (123A) formed downward from the vicinity of the switching guide 124 and a portion (123B) formed in the middle in the middle of the path.
[0053]
The sheet fed into the double-sided path 123 is temporarily drawn by the reverse roller 125 into the reverse path 126 formed on the extension of the portion 123 </ b> A formed in the downward direction of the double-sided path 123. When the paper is drawn into the reversing path 126, the reversing roller 125 is reversed and feeds the paper to the portion 123 </ b> B formed in the substantially horizontal direction in the double-sided path 123. At this point, the front and back of the paper are reversed.
[0054]
The sheet fed into the double-sided path 123B formed in the substantially horizontal direction is conveyed by the conveyance rollers 127, 128, and 129 formed on the double-sided path 123B. The double-sided path 123 </ b> B is connected to the paper path 106 below the conveyance roller 110. The paper that has been transported through the double-sided path 123B by the transport rollers 127, 128, and 129 and sent to the paper path 106 is sent again below the photosensitive drum 112, and an image is formed on the back surface this time.
[0055]
A manual feed tray 130 that realizes paper feeding other than paper feeding from the paper feeding cassette 103 is provided on the side surface of the main unit 102. The uppermost sheet of the stack of sheets placed on the manual feed tray 130 is taken in by the pickup roller 131 and transferred to the registration roller 111 by the transport roller 132.
[0056]
2 and 3 are perspective views showing a state in which the photosensitive drum holding device 200 according to the present exemplary embodiment holds the photosensitive drum 112. FIG. FIG. 2 is a perspective view of the photoconductor drum holding device 200 viewed from the flywheel side described later, and FIG. 3 is a perspective view of the photoconductor drum holding device 200 viewed from the photoconductor drum 112 side.
[0057]
As shown in FIGS. 2 and 3, the photosensitive drum holding device 200 is disposed on the side surface of the photosensitive drum 112 and is coaxially engaged with the photosensitive drum 112 (hereinafter simply referred to as “shaft”). 201) is rotatably held by the bracket 202. The shaft 201 passes through a hole formed at a predetermined position of the bracket 202 and is held by the bracket 202 via a bearing 203 attached to the hole.
[0058]
A flywheel 204 is attached to the end portion of the shaft 201 protruding from the bracket 202 to the side surface. The flywheel 204 is attached to suppress the rotation unevenness of the photosensitive drum 112 due to its inertial mass. The flywheel 204 is attached to the shaft 201 of the photosensitive drum 112 through a flange having a special feature in the photosensitive drum holding device 200. Details of the flange will be described later with reference to FIGS. 4 and 5.
[0059]
Further, the flywheel 204 has a plurality of hole portions 205 as first rotation stop holes formed at predetermined positions on the surface and in the vicinity of the peripheral surface portion. In the hole 205, a rod member 206 used for preventing the flywheel 204 from rotating in the operation of attaching the flywheel 204 to the shaft 201 of the photosensitive drum 112 is passed.
[0060]
One end of the bar member 206 is thinner than the other part. As shown in FIG. 3, the rod member 206 that has passed through the flywheel 204 is inserted into a hole 207 as a second rotation stop hole formed at a predetermined position of the bracket 202. The hole portion 207 has a size that allows a thin portion of the bar member 206 to enter but a thick portion to enter. By inserting into the hole 207 formed in the bracket 202 through the hole 205 of the flywheel 204, the rod member 206 serves as a stopper for preventing the flywheel 204 from rotating.
[0061]
The bracket 202 has a shape that secures a space for housing a motor 208 that is a drive source for supplying power to the photosensitive drum 112. The power from the motor 208 is fixed to the shaft 201 of the photosensitive drum 112 and is given to the photosensitive drum 112 via a drive gear 209 disposed outside the bracket 202. The power from the motor 208 is transmitted to the photosensitive drum 112 through the drive gear 209 and the shaft 201 of the photosensitive drum 112.
[0062]
Hereinafter, the structure around the flange of the photosensitive drum holding apparatus 200 will be described with reference to FIGS. 4 and 5. FIG. 4 is an exploded perspective view around the flange of the photosensitive drum holding device 200. FIG. 5 is an exploded cross-sectional view around the flange of the photosensitive drum holding device 200.
[0063]
As shown in FIG. 4, the end 201 </ b> A (hereinafter referred to as “shaft end”) 201 </ b> A of the photosensitive drum 112 has a shape that reliably transmits the rotation of the shaft 201 to the flywheel 204. That is, a predetermined position on the peripheral surface is cut, and a shape having opposite sides on the cut surface is formed. The shape of the shaft end 201A is not limited to this, and a shape such as a D-cut shape may be employed. Further, a screw hole 201B is provided in the top (end surface) of the shaft end 201A. The flange 401 is connected to the shaft end 201A having such a shape.
[0064]
The flange 401 is connected to the shaft end portion 201 </ b> A and transmits the rotation of the shaft 201 to the flywheel 204. The flange 401 is made of a material such as resin, for example. The flange 401 is provided with a storage portion 401A for storing the shaft end portion 201A. A hole 401B into which the shape of the shaft end portion 201A is fitted is formed inside the storage portion 401A (see FIG. 5). The shaft end 201A and the flange 401 are connected by fitting the shaft 201 into the hole 401B. Thereby, the rotation of the shaft 201 is transmitted to the flange 401.
[0065]
On the other hand, the outer side of the storage portion 401 </ b> A has a shape that reliably transmits the rotation of the shaft 201 to the flywheel 204 like the shaft 201. In other words, a predetermined position is cut and a shape having opposite sides on the cut surface is formed. The flywheel 204 is connected to the storage portion 401A having such a shape.
[0066]
The flywheel 401 is formed with a hole 204 </ b> A for accommodating the accommodating portion 401 </ b> A at the center thereof. The hole portion 204A is formed in a shape in which the outer shape of the storage portion 401A is fitted. The flange 401 and the flywheel 204 are connected by fitting the outer shape of the storage portion 401A into the hole portion 204A.
[0067]
The flywheel 204 has a weight of a certain level or more because of its feature of suppressing rotation unevenness due to its inertial mass. For this reason, when connecting with the flange 401, the load is distributed by screwing around the hole 204A. Specifically, the flywheel 204 and the flange 401 are fastened by inserting the screw 402 through a plurality of screw holes 204B formed around the hole portion 204A and inserting the screw hole 401C provided in the flange 401. Yes. Accordingly, the flywheel 204 and the flange 401 are integrated, and the rotation of the shaft 201 is transmitted to the flywheel 204 through the flange 401.
[0068]
The flange 401 is fixed to the shaft 201 by screwing it with a screw 403 in a screw hole 201B formed in the shaft end portion 201A fitted inside the storage portion 401A fitted in the hole portion 204A of the flywheel 204. The By fixing the flange 401 to the shaft 201, the flywheel 204 integrated with the flange 401 is also fixed to the shaft 201.
[0069]
When the screw 403 is inserted into the screw hole 201B formed in the shaft end portion 201A, a flange cap 404 is disposed between the screw 403 and the shaft end portion 201A. That is, the screw 403 passes through the hole formed in the flange cap 404 and is inserted into the screw hole 201B formed in the shaft end 201A.
[0070]
As shown in FIG. 4, the flange cap 404 constitutes an inner peripheral portion on the insertion side of the screw 403 in the storage portion 401 </ b> A of the flange 401, and has a shape that is separably fitted into the storage portion 401 </ b> A. The flange cap 404 has an uneven shape on the outer periphery. Specifically, a ring shape corresponding to the screw hole 201 </ b> B is provided, and a predetermined convex shape is provided from the ring shape toward the peripheral surface of the storage unit 401.
[0071]
On the other hand, the end surface of the storage portion 401A is provided in a shape in which the uneven shape of the flange cap 404 is fitted. Specifically, a groove into which the flange cap 404 is fitted is formed at the end of the storage portion 401A, and a concave / convex shape corresponding to the concave / convex shape of the flange cap 404 is formed on the inner periphery of the inner portion of the groove. Is provided. That is, the ring shape of the flange cap 404 is fitted, and the flange cap 404 is provided with a concave shape that accommodates the convex shape of the flange cap 404.
[0072]
After the flange cap 404 is fitted into the end portion of the storage portion 401A, the screw 403 is inserted into the screw hole 201B formed in the shaft end portion 201A. Therefore, when the flange 401 is rotated by the rotation of the shaft 201, the flange cap 404 rotates integrally with the flange 401 by the convex portion of the flange cap 404 coming into contact with the concave portion of the storage portion 401 </ b> A.
[0073]
A first locking member 405 and a second locking member 406 are disposed between the head 403A of the screw 403 and the flange cap 404 and between the flange cap 404 and the shaft end 201A, respectively. That is, the screw 403 passes through the holes formed in the first loosening member 405, the flange cap 403, and the second loosening prevention member 406 and is inserted into the screw hole 201B formed in the shaft end portion 201A.
[0074]
The first locking member 405 and the second locking member 406 are arranged to prevent the screw 403 from being loosened due to the load of the flywheel 204. That is, the first locking member 405 and the second locking member 406 are used as members that absorb the load of the flywheel 204. The first locking member 405 and the second locking member 406 are made of, for example, a spring washer.
[0075]
FIG. 6 is a cross-sectional view showing a state where all the components of the photosensitive drum holding device 200 are connected. Note that the bar member 206 is not necessary after all the components are connected, but in FIG. 6, the bar member 206 is also added to the cross-sectional view for reference.
[0076]
FIG. 7 is a view showing the flywheel 204 when all the components of the photosensitive drum holding device 200 are connected. 7A is a view of the flywheel 204 as viewed from the front side (outside of the photoconductor drum holding device 200), and FIG. 7B is a view of the flywheel 204 at the back side (the photoconductor drum holding device 200). It is the figure seen from the inside. In FIG. 7B, for convenience of explanation, only the configuration on the flywheel 204 side from the flange 401 is shown, the second locking member 406 is shown inside, and the shaft 201 is omitted.
[0077]
As shown in FIGS. 6 and 7A, when all the components are connected, the end of the storage portion 401A of the flange 401 storing the shaft 201 is slightly from the hole portion 204A formed in the flywheel 204. Protrusively. The end portion of the storage portion 401A protrudes from the hole portion 204A as much as the flange cap 404 is fitted.
[0078]
A flange cap 404 is fitted into the end portion of the storage portion 401A with the second locking member 406 interposed therebetween. With the first locking member 405 sandwiched between the screw head 403A and the flange cap 404, the screw 403 is inserted into the hole 201B formed in the shaft end 201A.
[0079]
At this time, as shown in FIG. 7A, the flange cap 404 is stored on the end surface of the storage unit 401 and fixed at the same height as the end surface of the storage unit 401. In FIG. 7A, the flange 401 and the flywheel 204 are connected by three screws 402. However, the present invention is not limited to this, and any number of screws 402 may be used as long as they can be connected.
[0080]
Hereinafter, the assembly work of the photosensitive drum holding apparatus 200 will be described with reference to FIG. As an assembling operation of the photoconductor drum holding device 200, the flywheel 204 may be connected to the shaft 201 of the photoconductor drum 112 from any direction, but in the present embodiment, the photoconductor drum 112 is particularly configured. The case where the shaft 201 is directed upward and the flywheel 204 is connected from the upper side will be described. That is, the case where the left side of FIG. 4 is the upper side and the right side is the lower side will be described.
[0081]
First, the bracket 202 holding the shaft 201 of the photosensitive drum 112 is fixed by a jig or the like via the bearing 203 so that the shaft 201 of the photosensitive drum 112 faces upward.
[0082]
Then, the flywheel 204 to which the flange 401 is fixed is placed from above so that the shaft 201 of the photoconductor 112 is accommodated in the accommodating portion 401 </ b> A of the flange 401. The flange 401 is fixed to the flywheel 204 by fitting the storage portion 401A of the flange 401 into the hole portion 204A of the flywheel 204 as described above, and then fastening the flywheel 204 and the flange 401 with the screws 402. Done in
[0083]
When the shaft 201 is housed in the housing portion 401A of the flange 401, the end of the housing portion 401A slightly protrudes from the surface of the flywheel 204 (the state shown in FIG. 6). At this time, the end surface of the storage portion 401 </ b> A is disposed at a position where it can be confirmed from the upper surface of the flywheel 204.
[0084]
When this state is reached, the rod member 206 is inserted into the hole portion 207 formed in the bracket 202 through the hole portion 205 formed in the flywheel 204. Thereby, the rotation of the flywheel 204 is limited.
[0085]
Then, in a state where the rotation of the flywheel 204 is restricted, the second locking member 406 is mounted on the portion for housing the flange cap 404 formed on the end surface of the housing portion 401A (the portion recessed when viewed from the top). Put. Further, the flange cap 404 is placed so as to be fitted into the end surface of the storage portion 401A from above.
[0086]
Finally, as shown in FIG. 4, the screw 403 with the first locking member 405 inserted is inserted into the screw hole 201B formed in the shaft end 201A through the flange cap 404 and the second locking member 406. Screw on. In this manner, the photosensitive drum holding device 200 is assembled.
[0087]
As described above, according to the photosensitive drum holding device 200 of the present embodiment, the inner peripheral portion of the flange 401 is separated as the flange cap 404, and the first locking member 405 is connected to the screw head 403A and the flange cap 404. To be sandwiched between. As a result, the first locking member 405 does not come off in the process of screwing work, so there is no need to hold the first locking member 405 by hand, and the flywheel 204 is held by the shaft 201 of the photosensitive drum 112. The work of screwing to can be facilitated.
[0088]
Further, the inner peripheral portion of the flange 401 is separated as a flange cap 404, and the second locking member 406 is sandwiched between the flange cap 404 and the shaft 201 of the photosensitive drum 112. As a result, the second locking member 406 does not come off in the process of screwing, so there is no need to hold the second locking member 406 by hand, and the flywheel 204 is held by the shaft 201 of the photosensitive drum 112. The work of screwing to can be facilitated.
[0089]
Further, since the second locking member 406 is sandwiched between the flange cap 404 and the shaft 201 of the photosensitive drum 112 from the insertion side of the screw 403 of the flywheel 204, the first locking member 405, the flange Since each of the cap 404 and the second locking member 406 can be attached from the same side of the flywheel 204, the second locking member can be turned by turning the hand below the heavy and heavy flywheel 204 with a large diameter as in the prior art. There is no need to hold 406, and the work of screwing the flywheel 204 to the shaft 201 of the photosensitive drum 112 can be facilitated.
[0090]
Further, according to the photosensitive drum holding device 200 of the present embodiment, a convex shape is provided on the outer periphery of the flange cap 404, while a concave shape corresponding to the convex shape of the flange cap 404 is provided on the end surface of the flange 401. As a result, when the photosensitive drum 112 rotates, the convex shape of the flange cap 404 meshes with the concave shape of the flange 401, and the flange cap 404 can be prevented from idling inside the flange 401. Accordingly, it is possible to prevent the screw 401 from being loosened due to an opposite force applied to the screw 401.
[0091]
The shape of the flange cap 404 is not limited to the shape of the present embodiment. Any shape may be selected as long as the flange cap 404 can prevent idling inside the flange 401.
[0092]
Furthermore, according to the photosensitive drum holding device 200 of the present embodiment, the flywheel 204 is passed by passing the rod member 206 through the hole 205 formed in the flywheel 204 and the hole 207 formed in the bracket 202. Is prevented from rotating. This prevents the flywheel 204 from being dragged and rotated when the screw 403 is turned, so that the screw 403 can be pushed to the end without pressing the flywheel 204 by hand.
[0093]
【The invention's effect】
As described above, according to the present invention, the flange that transmits the rotation of the drive shaft of the photosensitive drum to the flywheel is separated into the flange and the flange cap that is fitted to the flange. Since the first locking member is sandwiched between the screw head to be fixed to the flange cap and the flange cap, while the second locking member is sandwiched between the flange cap and the drive shaft, the flange is fixed to the drive shaft. Since the first locking member and the second locking member do not come off during the screwing operation, there is no need to hold the first locking member or the second locking member by hand, and the flywheel is exposed. The work of screwing on the drive shaft of the body drum can be facilitated.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an electrophotographic recording apparatus to which a photosensitive drum holding device according to an embodiment of the present invention is applied.
FIG. 2 is a perspective view of a state in which the photosensitive drum holding device according to the embodiment holds the photosensitive drum.
FIG. 3 is a perspective view of a state in which the photosensitive drum holding device according to the embodiment holds the photosensitive drum.
FIG. 4 is an exploded perspective view around the flange of the photosensitive drum holding device according to the embodiment.
FIG. 5 is an exploded cross-sectional view around the flange of the photosensitive drum holding device according to the embodiment.
FIG. 6 is a cross-sectional view showing a state in which all components of the photosensitive drum holding device according to the embodiment are connected.
FIG. 7 is a view showing a flywheel when all the constituent elements of the photosensitive drum holding device are connected.
FIG. 8 is an enlarged view of a connecting portion between a shaft of a photosensitive drum and a flange of a conventional photosensitive drum holding device.
[Explanation of symbols]
100 Electrophotographic recording apparatus
112 Photosensitive drum
200 Photosensitive drum holding device
201 axis
202 Bracket
204 Flywheel
205 hole
206 Bar material
207 hole
208 motor
209 Drive gear
401 Flange
402, 403 screw
404 Flange cap
405 First locking member
406 Second locking member

Claims (6)

A drive shaft that is coaxially engageable with the photosensitive drum and has a screw hole on an end surface thereof, a flywheel that is held coaxially with the drive shaft and suppresses rotational unevenness applied to the photosensitive drum by its inertial mass; and A flange that is fixed to the center of the flywheel and has a hole that fits into the shaft end of the drive shaft, transmits the rotation of the drive shaft to the flywheel , and has a groove at the screw hole side end And a flange cap having a hole substantially in the center,
After the hole portion of the flange is fitted to the shaft end portion of the drive shaft, a locking member is inserted between the flange cap and the drive shaft end surface to fit the groove portion of the flange. A photosensitive drum holding device , wherein the flange is fixed to the drive shaft by inserting a screw into a hole of the flange cap through a locking member and screwing the screw into a screw hole on the end surface of the drive shaft . 2. The photosensitive drum holder according to claim 1, wherein the flange cap has irregularities on an outer periphery, and the flange has irregularities corresponding to the irregularities on an inner periphery of the groove portion into which the flange cap is fitted. apparatus. The flange has a storage portion that fits with a shaft end portion of the drive shaft through a hole portion of the flange and stores the shaft end portion, and a groove portion in which the flange cap is fitted to the storage portion end portion. The flange cap has a ring shape and has a convex shape toward the peripheral surface of the storage portion, and the groove portion has a concave shape for fitting the ring shape and accommodating the convex shape. The photosensitive drum holding apparatus according to claim 1, wherein the photosensitive drum holding apparatus is provided. A first rotation stop hole is provided on the surface of the flywheel, a rod member that is passed through the first rotation stop hole, and a bracket that houses a drive source that transmits power to the drive shaft. to the time of screwing the flywheel to the drive shaft, the first rotary claims, characterized in that said rod member is provided with a second rotation stopper holes to be inserted through the locking hole 1 to claim 3 The photosensitive drum holding device according to any one of the above. An electrophotographic recording apparatus comprising the photosensitive drum holding device according to claim 1. A copying machine comprising the photosensitive drum holding device according to claim 1.

Images