JP4328471B2 - Electrophotographic image forming apparatus - Google Patents

Electrophotographic image forming apparatus Download PDF

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Publication number
JP4328471B2
JP4328471B2 JP2001082829A JP2001082829A JP4328471B2 JP 4328471 B2 JP4328471 B2 JP 4328471B2 JP 2001082829 A JP2001082829 A JP 2001082829A JP 2001082829 A JP2001082829 A JP 2001082829A JP 4328471 B2 JP4328471 B2 JP 4328471B2
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JP
Japan
Prior art keywords
motor
rotational speed
image forming
photosensitive drum
forming apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2001082829A
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Japanese (ja)
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JP2002278366A (en
Inventor
昇 幸村
明 日下田
茂 杉田
Original Assignee
キヤノン株式会社
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Priority to JP2001082829A priority Critical patent/JP4328471B2/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophotographic image forming apparatus and a process cartridge for driving an electrophotographic photosensitive member via a joint or a gear with an output of a motor.
[0002]
Here, the electrophotographic image forming apparatus forms an image on a recording medium using an electrophotographic image forming system. Examples of the electrophotographic image forming apparatus include an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer, etc.), a facsimile machine, a word processor, and the like.
[0003]
The process cartridge is a cartridge in which a charging unit, a developing unit or a cleaning unit and an electrophotographic photosensitive member are integrally formed, and the cartridge can be attached to and detached from the main body of the electrophotographic image forming apparatus. In addition, at least one of the charging unit, the developing unit, and the cleaning unit and the electrophotographic photosensitive member are integrally formed into a cartridge so that it can be attached to and detached from the main body of the electrophotographic image forming apparatus. Further, it means that at least the developing means and the electrophotographic photosensitive member are integrated into a cartridge so that it can be attached to and detached from the electrophotographic image forming apparatus main body.
[0004]
[Prior art]
2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus using an electrophotographic image forming process, the electrophotographic photosensitive member and the process means acting on the electrophotographic photosensitive member are integrally formed into a cartridge, and this cartridge is used as the main body of the electrophotographic image forming apparatus. A process cartridge system that is detachable is adopted. According to this process cartridge system, the maintenance of the apparatus can be performed by the user himself / herself without depending on the service person, so that the operability can be remarkably improved. For this reason, this process cartridge system is widely used in electrophotographic image forming apparatuses.
[0005]
There is also an electrophotographic image forming apparatus in which the electrophotographic photosensitive member is installed on the main body of the image forming apparatus.
[0006]
Conventionally, in this type of apparatus, without detecting the movement information of the electrophotographic photosensitive member that is an image carrier, the motor is controlled by the information of the movement information generating means arranged in the vicinity of the motor, thereby the image carrier. I was moving my body.
[0007]
[Problems to be solved by the invention]
In the above conventional example, although the image carrier is driven from the motor through a joint or the like, the motor is controlled by the movement information generating means arranged in the vicinity of the motor. May have worsened. Even when the accuracy of movement of the image carrier does not matter, since movement information in the image carrier is not detected, even if the motor is driven normally, the image carrier is not driven normally. Anomaly could not be detected.
[0008]
A first object of the invention according to the present application is to provide an electrophotographic image forming apparatus and a process cartridge having improved movement accuracy of an electrophotographic photosensitive member.
[0009]
A second object of the invention according to the present application is to provide an electrophotographic image forming apparatus and a process cartridge capable of detecting that an abnormality has occurred in the movement of an electrophotographic photosensitive member although a motor is normal due to a failure of a joint or the like. That is.
[0010]
[Means for Solving the Problems]
  The invention of this application isAn electrophotographic image forming apparatus for forming an image on a recording medium,
  An electrophotographic photosensitive member, process means acting on the electrophotographic photosensitive member, a motor for driving the electrophotographic photosensitive member, and a shaft coupling or gear provided on one end side of a driving shaft of the motor Drive transmission means for transmitting the rotational force of the motor to the electrophotographic photosensitive member; motor rotational speed detection means for detecting the rotational speed of the motor provided at the other end of the drive shaft of the motor; and the electrophotographic photosensitive member. Based on the outputs of the photosensitive member rotational speed detecting means, the conveying means for conveying the recording medium, the display means, the motor rotational speed detecting means, and the photosensitive member rotational speed detecting means. A control circuit for controlling
  The control circuit compares the rotational speed detected by the motor rotational speed detecting means with the driving state of the motor, and determines that it is abnormal rotation of the motor if they do not match, and rotates the photosensitive member. The rotational speed detected by the speed detecting means is compared with the rotational speed detected by the motor rotational speed detecting means. If they do not match, it is determined that the electrophotographic photosensitive member is abnormal in rotation, and this is indicated in the display. Display on meansIt is characterized by this.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0034]
First, an image forming apparatus and a process cartridge to which the present invention is applied will be described.
[0035]
(overall structure)
10 and 11 schematically show the image forming apparatus 6 and the process cartridge 7 according to the present invention. The image forming apparatus 6 is a laser printer using an electrophotographic technique, in which a process cartridge 7 is detachably mounted.
[0036]
When the process cartridge 7 is mounted on the image forming apparatus main body 14, an exposure device (laser scanner unit) 23 is disposed on the upper side of the process cartridge 7, and an image is disposed on the inner side (right side in FIG. 1) of the process cartridge 7. A sheet tray 24 containing a recording medium (sheet material) P to be formed is arranged. Further, the image forming apparatus main body 14 includes a paper feed roller 15, a transfer guide 16, a transfer charging roller 70, a transport guide 18, a fixing device 19, a paper discharge roller pair 20, along the transport direction of the sheet material P. A paper discharge tray 21 and the like are disposed. The process cartridge 7 integrally accommodates four types of process devices including an electrophotographic photosensitive drum (hereinafter referred to as a photosensitive drum) 3, a charging device 30, a developing device 40, and a cleaning device 50.
[0037]
That is, a cleaning unit in which the photosensitive drum 3, the cleaning device 50, and the charging roller 31 are integrated with a cleaning frame body 22 a and a toner development frame body 22 d that supports the developing roller 41 and the developing sleeve 42 and stores the toner T are combined. It is. Here, the cleaning frame 22a and the toner developing frame 22d constitute a cartridge frame.
[0038]
The process cartridge 7 is mounted by opening the openable / closable cartridge door 14 a and inserting a guided portion (not shown) provided in the process cartridge 7 into a guide (not shown) provided in the image forming apparatus main body 14. As a result, the process cartridge 7 and the image forming apparatus main body 14 are connected at one end thereof by a driving force transmitting means described later. Here, the other end side of the process cartridge 7 is positioned by the guide portion and the guided portion, while the one end side of the process cartridge 7 is positioned by connection of a driving force transmitting means described later.
[0039]
(Description of image forming process)
Next, an outline of image formation will be described. Based on the print start signal, the photosensitive drum 3 is rotated at a predetermined peripheral speed (process speed) in the direction of the arrow R1. A charging roller 31 forming a main part of the charging device 30 is in contact with the outer peripheral surface of the photosensitive drum 3 in a state where a predetermined voltage is applied, and the outer peripheral surface of the photosensitive drum 3 is set at a predetermined potential. It is uniformly charged.
[0040]
From the exposure device 23 which is a laser scanner unit, laser light L modulated in accordance with the time-series electric digital pixel signal of the target image information is output, and the process cartridge 7 is supplied from the exposure window 23b on the upper surface of the process cartridge 7. The light enters the inside and scans and exposes the outer peripheral surface (photosensitive layer) of the photosensitive drum 3. As a result, an electrostatic latent image corresponding to the target image information is formed on the outer peripheral surface (photosensitive layer) of the photosensitive drum 3. The electrostatic latent image is developed as a toner image by a developer (toner) T supplied from the developing device 40.
[0041]
On the other hand, the sheet material P is fed from the sheet tray 24 by the paper feed roller 15 in synchronism with the output timing of the laser beam L, and the photosensitive drum 3 and the main part of the transfer device are passed through the transfer guide 16. Timing is supplied to the transfer position between the transfer roller 70 and the transfer roller 70. At this transfer position, the toner image is sequentially transferred from the photosensitive drum 3 to the sheet material P as a recording medium.
[0042]
The sheet material P to which the toner image has been transferred is separated from the photosensitive drum 3 and conveyed to the fixing device 19 along the conveyance guide 18 and passes through the nip portion between the fixing roller 19a and the pressure roller 19b. The toner image is fixed on the sheet material P by pressure and heat fixing processing at the nip portion. The sheet material P that has undergone the toner image fixing process is conveyed to the discharge roller pair 20 and discharged to the discharge tray 21.
[0043]
On the other hand, after the transfer, the photosensitive drum 3 is subjected to image formation starting from charging again after the residual toner on the outer peripheral surface is removed by the cleaning device 50.
[0044]
(Description of photosensitive drum)
As shown in FIG. 12, the photosensitive drum 3 includes a drum cylinder 200 in which a photosensitive layer is formed on the outer peripheral surface of a cylinder made of a nonmagnetic conductive material such as aluminum, and a first fixed to one end of the drum cylinder 200. A flange 210 and a second flange 220 fixed to the other end of the drum cylinder 200 are formed.
[0045]
The first flange 210 includes a projecting convex portion 211 as a driving force receiving portion, a rotary sliding portion 212 as a supported portion, and a first gear portion 213 as a driving force transmission portion to the process cartridge internal mechanism. The first coupling portion 214 is a fixing portion that is fitted and fixed to the drum cylinder 200, and is fitted and fixed to the drum cylinder 200 by the first coupling portion 214. The second flange 220 has a second gear portion 221 and a second coupling portion 222, and is fitted and fixed to the drum cylinder 200 at the second coupling portion 222.
[0046]
In addition, a through hole 211b is provided in the shaft core portion of the first flange 210, and a ground pin 215 is press-fitted into the hole 211b. A ground plate 216 is attached to the inner end surface of the first flange 210, and the drum cylinder 200 and the convex portion side end surface 215 a of the ground pin 215 are electrically connected. The second flange 220 is rotatably supported by a drum shaft (not shown) fitted into the center hole 220a. This drum shaft is fixed to the cleaning frame 22a shown in FIG. The first and second flanges 210 and 220 are fixed to the drum cylinder 200 by caulking, adhesion, or press fitting.
[0047]
(Description of developing device)
As shown in FIG. 11, the developing device 40 includes a developing roller 41 that includes toner T and supplies the toner T to the photosensitive drum 3. The developing roller 41 whose both ends are rotatably supported by the toner developing frame 22d includes a magnet roller 43, and a developing roller gear 44 is attached to one end thereof as shown in FIG. The developing roller gear 44 meshes with the first gear portion 213 of the photosensitive drum 3 to form a gear train, and the developing roller 41 is driven to rotate.
[0048]
At this time, the toner T is attracted to the vicinity of the developing roller 41 by the magnetic force of the magnet roller 43, conveyed to the developing blade 42 by the rotation of the developing roller 41, the layer thickness is regulated by the developing blade 42, and a predetermined charge is applied. And conveyed in the direction of the photosensitive drum 3.
[0049]
(Description of transfer device)
As shown in FIG. 12, the transfer device includes a transfer roller 70 in which a conductive coating layer is formed on the outer periphery of the core material 69, a transfer roller gear 71 fixed to one end of the transfer roller 70, and a transfer roller 70. A transfer bearing 72 and a transfer spring 73 are arranged at both ends. Here, the transfer roller gear 71 forms a gear train with the second gear 221 of the photosensitive drum 3, and the transfer roller 70 is driven to rotate while being urged in the direction of the photosensitive drum 3. Further, at least one of the transfer bearing 72 and the transfer spring 73 form a power feeding path, and a predetermined transfer bias is supplied to the transfer roller 70 at the time of image formation. The transfer bearing 72 is movably provided on a guide (not shown) in the direction connecting the photosensitive drum 3 and the center of the transfer roller 70. This guide is provided in the apparatus main body 14.
[0050]
(Explanation of driving force transmission)
Next, the convex portion 211 of the first flange 210 and the concave portion 101 provided on the drive shaft 100 of the image forming apparatus 6, which serve as a driving force transmission unit of the process cartridge 7, will be described.
[0051]
As shown in FIG. 12, the first flange 210 has a first coupling portion 214 fitted and fixed to the drum cylinder 200, a first gear portion 213 having a diameter expanded from the first coupling portion 214, and an overlap with the first gear portion 213. A rotary sliding part 212 and a convex part 211 having a convex-part-side end surface 211a provided on the end face of the rotary sliding part 212 in the axial direction in this order are integrally formed. .
[0052]
The convex portion 211 of the first flange 210 that is the driving force receiving portion has a twisted prism shape having a substantially equilateral triangular cross section. On the other hand, in the image forming apparatus main body 14, the drive shaft 100 is disposed at a position corresponding to the convex portion 211. At the tip of the drive shaft 100, there is provided a twisted square hole-shaped concave portion 101 having a substantially equilateral triangular cross section into which the convex portion 211 can be inserted.
[0053]
The drive shaft 100 is connected to the cartridge door 14a by a mechanism (not shown). When the cartridge door 14a is open, the drive shaft 100 is pulled axially into the image forming apparatus main body 14, and when the cartridge door 14a is closed, a process is performed with a predetermined pressure by a spring. It is configured to be urged in the axial direction in the direction of the cartridge 7. For this reason, the convex portion 211 of the first flange 210 and the concave portion 101 of the drive shaft 100 fit together when the cartridge door 14a is closed or immediately after the start of driving.
[0054]
In a state where the process cartridge 7 is inserted into the image forming apparatus 6, one end side of the process cartridge 7 which is one end side of the drum cylinder 200 and opposed to the drive shaft 100 has a backlash in the radial direction with respect to the operating position by means not shown. Since this is held, the axis Y of the convex portion 211 and the axis X of the concave portion 101 are shifted by the amount of play as shown in FIG. However, when the drive shaft 100 is rotationally driven with the convex portion 211 inserted into the concave portion 101, the convex portion ridgeline 211 a of the convex portion 211 tends to come into contact with the concave portion inner surface 101 a of the concave portion 101. Here, since the axis of the drive shaft 100 provided with the recess 101 is provided so as not to move with respect to the frame of the image forming apparatus, the convex axis Y matches the concave axis X ( (Refer FIG.13 (b)). Further, since the force acts on the concave portion 101 and the convex portion 211 in the pulling direction due to the twisted shape, the photosensitive drum 3 is pulled toward the drive shaft 100, and the entire process cartridge 7 is positioned. Driven by rotation. At this time, since the driving force is transmitted to the developing roller 41 via the first gear portion 213 and the transfer roller gear 71 via the second gear portion 221, both the developing roller 41 and the transfer roller 70 are rotated by the photosensitive drum 3. Driven.
[0055]
As shown in FIG. 12, a ground contact 102 that is electrically grounded is provided at the center of the drive shaft 100. The ground contact 102 is biased toward the process cartridge 7 by a biasing means (not shown). When the process cartridge 7 is mounted, the ground contact 102 comes into contact with the convex-side end surface 215a of the ground pin 215, and the drum cylinder 200 is electrically grounded.
[0056]
The drive shaft 100 is connected to the motor 1 as shown in FIGS. In addition, the coupling 2 which can be engaged / disengaged is comprised by the recessed part 101 and the convex part 211. 1 to 6, the photosensitive drum 3 is directly connected to the motor 1 via the joint 2. 7 to 9, the drive shaft 100 is connected to the motor 1 through the drive system 10.
[0057]
Next, a method for detecting abnormal movement of the surface of the photosensitive drum will be described. Here, the movement abnormality means that the moving speed of the surface of the photosensitive drum does not move at a predetermined moving speed with respect to the output for driving the motor by the control device. That is, it means that the photosensitive drum does not rotate at the rotation speed that should be obtained from the predetermined rotation speed of the motor. The modes are as follows: (1) The rotational speed of the photosensitive drum varies. (2) The photosensitive drum rotates at a rotation speed slower than the speed obtained from the rotation speed at which the motor should rotate by the output of the control circuit 13 controlling the motor. (3) At the start, the photosensitive drum is rotated after the rotation speed of the motor.
[0058]
  (Reference Example 1)
  FIG. 1 illustrates the present invention.Reference example 11 is a motor which is a drive source of the photosensitive drum 3. A joint 2 transmits the output of the motor 1 to the photosensitive drum 3. Reference numeral 4 denotes an encoder plate which is paired with the photo interrupter 5 and detects rotation information of the photosensitive drum 3. Reference numeral 5 denotes a photo interrupter that detects the rotational speed of the photosensitive drum 3 in a pair with the encoder plate 4. Reference numeral 13 denotes a control circuit that controls the movement of the entire image forming apparatus, and reference numeral 6 denotes a code that indicates the entire image forming apparatus. In the configuration described above, the control circuit 13 controls the rotational speed of the motor 1 using the rotational speeds from the encoder plate 4 and the photo interrupter 5 and compares the driving state of the motor 1 with the rotational speed to determine that there is a discrepancy. It is determined that rotation abnormality of the body drum 3 has occurred. Here, the driving state of the motor 1 indicates the state of the output of the control circuit 13 to the motor 1 (the same applies hereinafter).
[0059]
Even if there is a backlash in the drive transmission portion between the motor 1 and the photosensitive drum 3, the rotational speed (rotational speed) of the photosensitive drum 3 is always fed back and the control circuit 13 determines the rotational speed of the photosensitive drum 3. Since the output to the motor 1 is changed to achieve a predetermined rotation, the rotational accuracy of the photosensitive drum 3 is maintained. . Here, a value that is set in the control circuit 13 in which a difference between the rotation speed detected by the encoder plate 4 and the photo interrupter 5 and the rotation speed of the photosensitive drum 3 set in the control circuit 13 is set in advance. If it exceeds, the control circuit 13 displays an abnormal rotation speed of the photosensitive drum 3 on a display means (not shown) provided in the image forming apparatus main body 14.
[0060]
When the motor 1 is a vibration wave motor or the like that does not require speed information for rotation control, the control circuit 13 rotates the motor 1 and drives the rotation of the encoder 1 and the rotation speed from the photo interrupter 5 and the motor 1. When the states are compared and they do not match, it is determined that rotation abnormality of the photosensitive drum 3 has occurred.
[0061]
  (Reference example 2)
  FIG. 2 illustrates the present invention.Reference example 27 is a process cartridge or an electrophotographic photosensitive member that includes one side of the photosensitive drum 3, the encoder plate 4, the photo interrupter 5, and the joint 2 and is detachable from the image forming apparatus main body 14.
[0062]
  The operation in the above configuration isReference example 1It is the same.
[0063]
  (Reference example 3)
  FIG. 3 illustrates the present invention.Reference example3 is a process cartridge or an electrophotographic photosensitive member that includes one side of the photosensitive drum 3, the encoder plate 4, and the joint 2, and is detachable from the image forming apparatus main body 14, and the photo interrupter 5 is an image forming apparatus main body. It is included on the 14th side.
[0064]
  The operation in the above configuration isReference exampleSame as 1.
[0065]
  (Embodiment 1)
  FIG. 4 illustrates the present invention.Embodiment 1It is.Reference numeral 1 denotes a motor which is a drive source of the photosensitive drum 3. A joint 2 transmits the output of the motor 1 to the photosensitive drum 3. Reference numeral 4 denotes an encoder plate which is paired with the photo interrupter 5 and detects rotation information of the photosensitive drum 3. Reference numeral 5 denotes a photo interrupter that detects the rotational speed of the photosensitive drum 3 in a pair with the encoder plate 4.Reference numeral 8 denotes an encoder plate that detects the rotational speed on the motor 1 side in a pair with the photo interrupter 9 disposed on the motor 1 side of the joint 2, and reference numeral 9 denotes a pair with the encoder plate 8 disposed on the motor 1 side of the joint 2. This is a photo interrupter that detects the rotation speed on the motor side.
[0066]
In the above configuration, the control circuit 13 controls the rotational speed of the motor 1 using both or one of the rotational speeds from the encoder plate 8 and the photo interrupter 9 and the rotational speeds from the encoder plate 4 and the photo interrupter 5 and the encoder. If the rotational speed from the plate 8 and the photo interrupter 9 and the driving state of the motor 1 are not in agreement, it is determined that the rotational abnormality of the motor 1 has occurred, and the rotational speed from the encoder plate 4 and the photo interrupter 5 If the drive state of the motor 1 or the rotation speeds from the encoder plate 8 and the photo interrupter 9 are not in agreement, it is determined that a rotation abnormality of the photosensitive drum 3 has occurred.
[0067]
When the motor 1 is a vibration wave motor or the like that does not require speed information for rotation control, the control circuit 13 rotates the motor 1 and drives the rotation of the motor 1 and the rotation speed from the encoder plate 8 and the photo interrupter 9. When the states are compared and they do not match, it is determined that the rotation abnormality of the motor 1 has occurred. Further, the control circuit 13 compares the rotational speed from the encoder plate 4 and the photo interrupter 5 with the driving state of the motor 1 or the rotational speed from the encoder plate 8 and the photo interrupter 9, and if they do not match, the control circuit 13 Judge that rotation abnormality has occurred.
[0068]
According to the present example in which the encoder plate 8 is provided on the rotor shaft of the motor 1, the motor 1 is feedback-controlled, and the motor 1 is kept in high-precision rotation by the control circuit 13. Accordingly, the rotation speed of the photosensitive drum 3 is controlled by the encoder plate 4, the photo interrupter 5, and the control circuit 13, so that the rotation speed can be controlled with higher accuracy. At this time, the target rotational speed of the motor 1 is controlled so that the photosensitive drum 3 has a predetermined rotational speed.
[0069]
According to this embodiment, it is possible to control the motor 1 and the photosensitive drum 3 with high accuracy, and to detect abnormal rotation speeds of the photosensitive drum 3 and the motor 1.
[0070]
  (Embodiment 2)
  FIG. 5 illustrates the present invention.Embodiment 2AndEmbodiment 1On the other hand, the process cartridge or the electrophotographic photosensitive member 7 including one side of the photosensitive drum 3, the encoder plate 4, the photo interrupter 5, and the joint 2 is detachably attached to the image forming apparatus main body 14.
[0071]
  The operation in the above configuration is the embodiment.1It is the same.
[0072]
  (Embodiment3)
  FIG. 6 shows an embodiment of the present invention.3In contrast to the fourth embodiment, the process cartridge or the electrophotographic photosensitive member 12 including one side of the photosensitive drum 3, the encoder plate 4, and the joint 2 is detachable from the image forming apparatus main body 14. Is included on the image forming apparatus 6 side.
[0073]
  The operation in the above configuration is the embodiment.1It is the same.
[0074]
  (Embodiment4)
  FIG. 7 shows an embodiment of the present invention.410 is a drive system such as a gear train and a belt device capable of distributing the output of the motor, and 11 is a load other than the photosensitive drum 3 driven by the motor 1.
[0075]
  In the above configuration, the operation in the case where the output of the motor 1 is normally transmitted to the joint 2 and later through the drive system 10 is described in the embodiment.1Is the same.
[0076]
Further, when the drive system 10 cannot normally transmit drive between the motor 1 and the joint 2, the control circuit 13 controls the rotation speed of the motor 1 using the rotation speed from the encoder plate 8 and the photo interrupter 9. And the rotational speed from the encoder plate 8 and the photo interrupter 9 and the driving state of the motor 1 are compared, and if they do not coincide with each other, it is determined that the rotation abnormality of the motor 1 has occurred, and the encoder plate 4 and the photo interrupter 5 The rotational speed of the photosensitive drum 3 is compared with the rotational speed of the motor 1 or the rotational speeds of the encoder plate 8 and the photo interrupter 9, and it is determined that a rotation abnormality of the photosensitive drum 3 has occurred.
[0077]
Further, when the drive system 10 cannot normally transmit drive between the motor 1 and the joint 2 and the motor 1 is a vibration wave motor or the like that does not require movement information for rotation control, the control circuit 13 is a motor. 1 and the rotational speed from the encoder plate 8 and the photo interrupter 9 and the driving state of the motor 1 are compared, and if they do not coincide with each other, it is determined that a rotation abnormality of the motor 1 has occurred. The rotational speed from the raptor 5 and the driving state of the motor 1 or the rotational speeds from the encoder plate 8 and the photo interrupter 9 are compared, and if they do not match, it is determined that an abnormal rotation of the photosensitive drum 3 has occurred.
[0078]
  (Embodiment5)
  FIG. 8 shows an embodiment of the present invention.5In contrast to the seventh embodiment, the process car lodge or the electrophotographic photosensitive member 7 including one side of the photosensitive drum 3, the encoder plate 4, the photo interrupter 5, and the joint 2 is detachable from the image forming apparatus main body 14. There is no.
[0079]
  The operation in the above configuration is the embodiment.4It is the same.
[0080]
  (Embodiment6)
  FIG. 9 shows an embodiment of the present invention.6In contrast to the seventh embodiment, the process cartridge or the electrophotographic photosensitive member 12 including one side of the photosensitive drum 3, the encoder plate 4, and the joint 2 is detachable from the image forming apparatus main body 14, and the photo interrupter 5 Is included on the image forming apparatus main body 14 side.
[0081]
  The above operation is the embodiment.4It is the same.
[0082]
In the above embodiment, the combination of the encoder plate and the photo interrupter is used as the moving speed detecting means. However, the present invention is not limited to this configuration, and any method can be used as long as the moving speed can be detected. As long as the required moving speed can be detected, the arrangement location is not limited to the embodiment.
[0083]
Further, in the above embodiment, the joint transmits the motor output to the photosensitive drum, but it may be a drive transmission that continuously transmits the driving force. For example, a gear may be used instead of the joint.
[0084]
In the above-described embodiment, the photosensitive drum, which is a drum-shaped photosensitive member, has been described, but the present invention can also be applied to an endless belt-shaped photosensitive belt. In this case, the rotational speed of the roller around which the photosensitive belt is wound may be detected, and the photosensitive belt side end may be a linear encoder. Further, although the photosensitive drum 3 is driven through the shaft coupling 2, the photosensitive drum 3 may be meshed with the gear of the output portion of the drive transmission means of the image forming apparatus main body 14 in a gear fixed coaxially with the photosensitive drum 3. Good.
[0085]
The above-described embodiment of the present invention will be summarized and the description will be supplemented as follows.
[0088]
  The first isIn the electrophotographic image forming apparatus 6 that forms an image on the sheet material P that is a recording medium,
  Motor 1;
  A drive shaft 100 which is a drive transmission means having a shaft coupling 2 or a gear for transmitting the rotation of the motor 1 to the photosensitive drum 3;
  A photosensitive drum 3 which is an electrophotographic photosensitive member;
  Process means acting on the photosensitive drum 3;
  A moving speed generating means for detecting the moving speed of the surface of the photosensitive drum 3 including the encoder plate 4 and the photo interrupter 5 is provided. Further, the motor rotation number detecting means has an encoder plate 8 and a photo interrupter 9, detects the rotation number of the motor 1 with a constant rotation number of the motor 1 by feedback control, and sends the detected rotation number to the control circuit. Motor rotation number detection means;
  A control circuit 13 for controlling the motor 1 and comparing the information generated by the moving speed generating means with the detection value of the motor rotation number detecting means to detect an abnormality in the moving speed of the surface of the photosensitive drum 3;
  Conveying means for conveying the sheet material P as a recording medium;
An electrophotographic image forming apparatus having
[0089]
In such a configuration, the motor 1 is always rotated at a constant speed by the control circuit 13 in accordance with the information from the motor rotation number detecting means comprising the encoder plate 8 and the photo interrupter 9, so that the encoder plate 4 When the rotational speed of the photosensitive drum 3 by the moving speed generating means comprising the photo interrupter 5 does not coincide with the motor rotational speed, it is understood that the photosensitive member surface movement of the photosensitive drum 3 is abnormal. In this case, it can be seen that there is an abnormality in the drive transmission portion between the motor 1 and the photosensitive drum 3.
[0093]
  Second isIn the electrophotographic image forming apparatus 6 that forms an image on the sheet material P, which is a recording medium, to which the process cartridge 12 is detachable,
a. Motor 1;
b. A drive shaft 100 as drive transmission means for transmitting the rotation of the motor 1 to the process cartridge 12;
c. An encoder plate 8 and a photo interrupter 9 which are motor rotation speed detecting means for detecting the rotation speed of the motor 1 and sending the detected rotation speed to the control circuit 13;
d. A photo interrupter 5 which is a main body side member of the electrophotographic image forming apparatus as a moving speed generating means for detecting the moving speed of the surface of the photosensitive drum 3 provided between the image forming apparatus main body 14 and the process cartridge 12;
e. A control circuit 13 for controlling the motor 1 and comparing the information generated by the moving speed generating means with the detection value of the motor rotational speed detecting means to detect an abnormality in the moving speed of the surface of the photosensitive drum 3;
f. A photosensitive drum 3;
Process means acting on the photosensitive drum 3;
  An encoder plate 4 that is a process cartridge side member of the moving speed generating means for generating speed information of the photosensitive drum 3 in combination with the main body side member of the moving speed generating means;
  A first flange 210 that is a driving force receiving member that can be engaged with and disengaged from the drive transmission means and drives the photosensitive drum 3;
Mounting means for detachably mounting the process cartridge 12 having
g. Conveying means for conveying the sheet material P as a recording medium;
An electrophotographic image forming apparatus having
[0094]
  3rd is 1st to 2ndThe drive transmission means has a drive system 10 which is a power distribution mechanism, and the drive shaft 100 which is a drive transmission means which transmits power after one distribution has a shaft coupling 2 or a gear (not shown).
[0095]
  4th is 1st to 3rdIn any one of the above, the motor 1 is a vibration wave motor that does not require detection of speed information for rotation control, for example, an ultrasonic motor or the like, and control for detecting an abnormality in the moving speed based on information from the moving speed report generating means Part.
[0096]
  5th is 1st to 4thThe photosensitive member is a drum-shaped photosensitive drum 3, and the moving speed generating means is an encoder plate 4 and a photo interrupter 5 for detecting the number of rotations of the photosensitive drum 3.
[0102]
【The invention's effect】
As described above, the movement of the electrophotographic photosensitive member can be detected at the final stage, and malfunctions such as malfunction of the electrophotographic image forming apparatus and the process cartridge due to the failure of the joint can be detected. Further, it is possible to control the motor as a driving source using the moving speed at the final stage of the process cartridge or the like, and in that case, it is possible to improve the moving accuracy.
[Brief description of the drawings]
FIG. 1 of the present inventionReference example1 is a schematic diagram showing an electrophotographic image forming apparatus 1.
FIG. 2 of the present inventionReference exampleFIG. 2 is a schematic diagram showing an electrophotographic image forming apparatus 2.
FIG. 3 of the present inventionReference exampleFIG. 3 is a schematic diagram showing an electrophotographic image forming apparatus 3.
FIG. 4 is a schematic diagram illustrating an electrophotographic image forming apparatus according to a first embodiment of the present invention.
FIG. 5 is a schematic diagram showing an electrophotographic image forming apparatus according to a second embodiment of the present invention.
FIG. 6 is a schematic diagram showing an electrophotographic image forming apparatus according to a third embodiment of the present invention.
FIG. 7 is a schematic diagram showing an electrophotographic image forming apparatus according to a fourth embodiment of the present invention.
FIG. 8 is a schematic diagram showing an electrophotographic image forming apparatus according to a fifth embodiment of the present invention.
FIG. 9 is a schematic diagram showing an electrophotographic image forming apparatus according to a sixth embodiment of the present invention.
FIG. 10 is a longitudinal sectional view of an embodiment of an electrophotographic image forming apparatus to which the present invention is applied.
FIG. 11 is a longitudinal sectional view of a process cartridge.
FIG. 12 is a developed cross-sectional view showing the periphery of the electrophotographic photosensitive drum.
FIGS. 13A and 13B are cross-sectional views perpendicular to the axis of the shaft coupling.
[Explanation of symbols]
  P Recording medium (sheet material)
  T Toner
  L Laser light
  Y Convex axis
  X Recessed shaft core
  1 Motor
  1a Cartridge door
  2 Fitting
  3 Electrophotographic photosensitive drum (photosensitive drum)
  4 Encoder plate
  5 Photo interrupters
  6 Image forming device
  7 Process cartridge
  8 Encoder plate
  9 Photo interrupter
  10 Drive system
  11 Load
  12 Process cartridge
  13 Control circuit
  14 Image forming apparatus body
  14a Cartridge door
  15 Paper feed roller
  16 Transfer guide
  18 Transport guide
  19 Fixing device
  19a Fixing roller
  19b Pressure roller
  20 Paper discharge roller pair
  21 Output tray
  22a Cleaning frame
  22d Toner development frame
  23 Exposure equipment (laser scanner unit)
  23b Exposure window
  24 Sheet tray
  27 Process cartridge
  30 Charging device
  31 Charging roller
  40 Developer
  41 Developing roller
  42 Development sleeve
  43 Magnet Roller
  44 Developing roller gear
  50 Cleaning device
  69 Heartwood
  70 Transfer roller
  71 Transfer roller gear
  72 Transfer bearing
  73 Transfer spring
  100 Drive shaft
  101 recess
  101a Concave inner surface
  102 Ground contact
  200 drum cylinder
  210 1st flange
  211 Convex
  211a Convex ridge line
  211b hole
  212 Rotating sliding part
  213 1st gear part
  214 First coupling part
  215 Earthpin
  215a Convex side end face
  216 Earth plate
  220 2nd flange
  220a Center hole
  221 Second gear part
  222 Second coupling part

Claims (1)

  1. An electrophotographic image forming apparatus for forming an image on a recording medium,
    An electrophotographic photosensitive member, process means acting on the electrophotographic photosensitive member, a motor for driving the electrophotographic photosensitive member, and a shaft coupling or gear provided on one end side of a driving shaft of the motor Drive transmission means for transmitting the rotational force of the motor to the electrophotographic photosensitive member; motor rotational speed detection means for detecting the rotational speed of the motor provided at the other end of the drive shaft of the motor; and the electrophotographic photosensitive member. Based on the outputs of the photosensitive member rotational speed detecting means, the conveying means for conveying the recording medium, the display means, the motor rotational speed detecting means, and the photosensitive member rotational speed detecting means. A control circuit for controlling
    The control circuit compares the rotational speed detected by the motor rotational speed detecting means with the driving state of the motor, and determines that it is abnormal rotation of the motor if they do not match, and rotates the photosensitive member. The rotational speed detected by the speed detecting means is compared with the rotational speed detected by the motor rotational speed detecting means. If they do not match, it is determined that the electrophotographic photosensitive member is abnormal in rotation, and this is indicated in the display. An electrophotographic image forming apparatus characterized by displaying on a means .
JP2001082829A 2001-03-22 2001-03-22 Electrophotographic image forming apparatus Expired - Fee Related JP4328471B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001082829A JP4328471B2 (en) 2001-03-22 2001-03-22 Electrophotographic image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001082829A JP4328471B2 (en) 2001-03-22 2001-03-22 Electrophotographic image forming apparatus

Publications (2)

Publication Number Publication Date
JP2002278366A JP2002278366A (en) 2002-09-27
JP4328471B2 true JP4328471B2 (en) 2009-09-09

Family

ID=18938724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001082829A Expired - Fee Related JP4328471B2 (en) 2001-03-22 2001-03-22 Electrophotographic image forming apparatus

Country Status (1)

Country Link
JP (1) JP4328471B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4722640B2 (en) * 2005-09-16 2011-07-13 株式会社リコー Rotating body rotation speed control device, process cartridge, and image forming apparatus
JP4919679B2 (en) * 2006-03-15 2012-04-18 株式会社リコー Rotating body driving device, process cartridge, and image forming apparatus
JP5011034B2 (en) * 2007-08-30 2012-08-29 株式会社リコー Driving force transmission device to rotating body and image forming apparatus having the same

Also Published As

Publication number Publication date
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