JP4084165B2 - Rotating body driving device and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly accurate rotating body drive device capable of position control or speed control, and an electrophotographic image forming apparatus such as a copying machine and a laser printer using the drive device, and a hard disk drive using the rotation drive device (Hard Disk Drive), positioning control devices such as robots, transfer belt drive devices used in electrophotographic image forming devices, transfer / photosensitive drum drive devices, belt drive devices in printing presses and output machines, roller drive devices The present invention is also applicable to a roller driving device in a paper conveying device.
[0002]
[Prior art]
A pattern is generated in advance on the circumference or end face of the rotating rotator, the rotation state is detected from the pattern, and drive control of the rotator is performed according to the detected rotation state (for example, Patent Document 1). reference). However, since a pattern generated in advance is used, the eccentric component of the rotating body cannot be measured when the position detection location of the rotating body is an end face in the axial direction. Further, even in the case of the circumference, the pattern accuracy is lowered due to the deformation due to the change over time or the temperature change. Further, the pitch of the resolution is limited as follows: resolution × integer = circumference length due to the circumference of the rotating body.
[0003]
In a configuration of a general rotating body drive control device, as one method of rotating a rotating body with a drive motor or the like, a binary pattern is directly written on the rotating body, the peripheral speed or rotational displacement is measured, and the information is obtained. Originally, drive control is performed so that the rotating body rotates accurately.
[0004]
However, there is a problem that unevenness occurs in the rotation of the rotating body due to the binary pattern accuracy for measuring the peripheral speed or rotational displacement and the information that cannot be measured even using the binary pattern. .
[0005]
On the other hand, in Patent Document 1, a pattern is generated in advance on the circumference or end face of the rotating rotator, the rotation state is detected from the pattern, and the drive control of the rotator is performed according to the detected rotation state. It is carried out. However, since the pattern is generated in advance, the eccentric component of the rotating body cannot be measured when the position detection location of the rotating body is the end face. Further, even in the case of the circumference, the pattern accuracy is lowered due to the deformation due to the change over time or the temperature change. Further, the pitch of the resolution is limited as follows: resolution × integer = circumference length due to the circumference of the rotating body.
[Patent Document 1]
Japanese Patent Laid-Open No. 9-229953
[0006]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating body driving device capable of performing accurate driving control even when a rotating body to be driven and controlled is deformed due to aging or thermal change, and to use such a rotating body driving device. Another object of the present invention is to provide an image forming apparatus.
[0007]
[Means for Solving the Problems]
The present invention has the following configuration in order to achieve the above object.
(1).In the rotating body drive device comprising a control means for controlling the circumferential speed or circumferential position of the electrostatic latent image carrier, the electrostatic latent image carrier has a recording layer on the circumferential surface, and 0 and 1 are A recording device that records a discriminable binary pattern on the recording layer, a detection device that detects a binary pattern recorded by the recording device, and after the detection device detects a binary pattern recorded by the recording device An erasing device for erasing, and the recording layer is in an amorphous state or a crystalline state depending on the intensity of irradiation light from the recording device, and forms a binary pattern in which 0 and 1 can be distinguished.(Claim 1).
(2).In the rotating body drive device comprising a control means for controlling the circumferential speed or the position in the circumferential direction of the electrostatic latent image carrier that is likely to be deformed by the initial environment but is less likely to be deformed over time, the electrostatic latent image carrier is A recording device having a recording layer on the surface and recording a binary pattern distinguishable between 0 and 1 on the recording layer, and a detection device for detecting the binary pattern recorded by the recording device, The recording layer is in an amorphous state or a crystalline state depending on the intensity of irradiation light from the recording device, and forms a binary pattern in which 0 and 1 can be distinguished.(Claim 2).
(3).In the rotating body drive device according to (1) or (2), the recording layer is in an amorphous state when receiving light exceeding a predetermined intensity, and is in a crystalline state when receiving light having a predetermined intensity or less. To do(Claim 3).
(4).In the rotating body driving device according to any one of (1) to (3), the irradiation light from the recording device is light stronger than light for writing an electrostatic latent image on the electrostatic latent image carrier. Be there(Claim 4).
(5).An electrostatic latent image carrier that is driven by the rotating body driving device according to any one of (1) to (4) is provided.In the image forming apparatus,The electrostatic latent image carrier is a drum-shaped photoconductor.(Claim 5).
(6).An electrostatic latent image carrier that is driven by the rotating body driving device according to any one of (1) to (4) is provided.In the image forming apparatus,Electrostatic latentThe image carrierbeltPhotoconductorBe(Claim 6).
(7).In the image forming apparatus for forming a color image by rotating a plurality of electrostatic latent image carriers, at least one of the plurality of electrostatic latent image carriers is driven by any one of (1) to (4). An image forming apparatus which is performed by the rotating body driving device according to claim 1;(Claim 7).
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 is an example of a rotating body drive device that is common to the following embodiments of the present invention. In FIG. 1, a shaft portion that rotatably supports the gear 126 and the driving pulley 120 is attached to the front side of the substrate 2 by cantilever support.
[0010]
A motor 109 is provided on the back side of the substrate 2, and the rotation shaft of the motor 109 passes through the substrate 2 and protrudes to the front side. A gear 109G is fixed to the motor shaft that protrudes to the front side, and the gear 109G is connected to the gear 109G. 126 is engaged. As a result, the motor 109 drives the drive pulley 120 via the gear 109G and the gear 126.
[0011]
A timing belt 122 is hung on the driving pulley 120 and the driven pulley 123, and a constant tension is applied by the tension pulley 125. The driven pulley 123 is attached with a rotating body 124 as an object of drive control via a shaft support means (not shown) so that the coaxiality is maintained, and the rotating body 124 is driven by rotating the motor 109.
[0012]
[1]Example 1:Implementation formstate(Claim 1Relation)
  In the first embodiment, a binary pattern that can discriminate between 0 and 1 as shown in FIG. 2 is generated on the circumference of the drum-shaped or columnar rotating body 124 shown in FIG.
[0013]
2 is driven by the drive system of FIG. When the drive control of the rotating body 124 is position control, the initial drive can be performed by setting the initial state of the initial drive to 0, that is, the origin. In the case of speed control, if the motor 109 is a DC motor, it is sufficient to input a constant current or voltage necessary for the initial drive. If the motor 109 is a pulse motor, the initial value can be obtained by inputting a pulse necessary for the initial drive. Driving is performed, and the rotating body 124 starts driving from there.
[0014]
In FIG. 2, the recording head 3, the detection head 4, and the erasing head 5 are arranged side by side in the rotational direction while being supported by a non-illustrated non-illustrated member so as to face the circumferential surface of the rotating body 124. The recording head 3, the detection head 4, and the erasing head 5 constitute an example of an apparatus capable of recording / detecting / erasing a binary pattern in which 0 and 1 can be discriminated on the circumference of the rotating body.
[0015]
The recording head 3 writes a binary pattern on the rotating body 124 that rotates by the initial drive. This binary pattern is written as a line 9 parallel to the axial direction of the rotating body 124 as shown in FIG. However, it is also possible to use dots instead of lines. If the writing speed is sufficiently faster than the rotational speed of the rotating body 124, even if the binary pattern is written in the axial direction of the rotating body, it becomes an oblique line due to the rotation of the rotating body 124. Can be measured sufficiently. Furthermore, even a pattern with two or more values is possible.
[0016]
The detection head 4 reads the binary pattern recorded by the recording head 3. In the binary pattern, the peripheral speed of the rotating body 124 can be obtained by measuring the time required to move the binary pulse width, or a certain time interval is determined and the time interval is determined. It is also possible to obtain the circumferential position of the rotating body 124 by counting the number of binary pulses.
[0017]
Here, the control unit 11 constitutes means for calculating the circumferential speed or circumferential position of the rotating body from the binary pattern detection information and controlling the circumferential speed or circumferential position of the rotating body based on the calculated information.
[0018]
Information read from the line 9 by the detection head 4 is input to the signal processing unit 10 to generate a voltage, voltage, pulse, or the like corresponding to the position or speed of the rotating body 124. An output from the signal processing unit 10 is input to the control unit 11.
[0019]
The controller 11 amplifies and outputs the output from the signal processing unit 10 when the rotating body 124 is different from the predetermined rotational speed. Therefore, the driving state of the motor 109 is controlled according to the output state to rotate the rotating body. A control signal for matching the rotation of 124 with a predetermined rotation is output.
[0020]
The driving force of the motor 109 is transmitted to the rotating body 124 through the transmission system 13, and the rotating body 124 rotates. Further, the binary pattern after being detected by the detection head 4 is erased by the erase head 5. The erased line 9 is shown as a broken line in FIG.
[0021]
By making the binary pattern that can distinguish 0 and 1 in this way into a rewritable type that can be erased and rewritten, the rotating body 124 is subject to environmental changes such as heat and humidity, and changes in rotational speed over time. Even if it occurs, since the binary pattern is refreshed by being rewritten, it is possible to always generate a binary pattern necessary for drive control.
[0022]
Further, since the binary pattern is erased after being recorded and measured, it is not necessary to set the interval between the binary patterns to a divisor of the circumference of the rotating body 124, and the resolution necessary for drive control is arbitrarily set. It is also possible.
[0023]
A mechanism for generating a binary pattern will be described using a specific example.
FIG. 3 is a simple configuration example as an example of the recording head 3 or the erasing head 5 in FIG. The recording layer 40 is attached on the circumference or end face of the rotating body 124. The recording layer 40 is irradiated with a laser from a laser diode 51, and is split into two beams La and Lb through a diffraction grating. The beams La and Lb are converted into parallel rays by the collimator lens 43, focused by the objective lens 41 through the quarter-wave plate 42, and further, the slit 53 forms a line 9 parallel to the axial direction of the rotating body. .
[0024]
At this time, when the laser layer is irradiated with a laser power of a certain level or more and rapidly cooled from a high temperature state, the recording layer 40 becomes an amorphous state. Further, when it is heated and cooled gradually with a laser power lower than that, a crystalline state is obtained. By utilizing the fact that the reflectance when the laser is applied in the amorphous state and the crystalline state is different, a binary pattern in which 0 and 1 can be discriminated can be generated by generating a recording and erasing state.
[0025]
In FIG. 3, it is possible to generate a binary pattern of dots by removing the slit 53 and focusing the laser. Further, by attaching a device that removes the slit 53 and scans the laser diode 51 and the objective lens 41 in the main scanning direction (axial direction) of the rotating body 124 at a constant period, a line oblique to the axial direction of the rotating body 124 is attached. It is also possible to generate a binary pattern.
[0026]
FIG. 4 shows a simple configuration of the detection head 4 in FIG. The binary pattern on the recording layer 40 generated by the recording head 3 is irradiated with laser from the laser diode 51 for detection, and is split into two beams La and Lb through the diffraction grating 50. These lasers are bent in the direction of the recording layer 40 by the polarization beam splitter 44. The collimator lens 43 makes parallel light beams, passes through the quarter-wave plate 42 and is focused by the objective lens 41. The reflected light from the recording layer 40 is reflected to the polarization beam splitter 44, passes through the polarization beam splitter 44, passes through the cylindrical lens 46, enters the photodetector 45, and a binary pattern is detected. Is detected.
[0027]
In this way, a binary pattern capable of discriminating 0 and 1 that can be recorded, detected, and erased can be generated on the rotating body 124. In addition, the binary pattern can be generated by using magnetic recording or the like. Further, the pattern type is not limited to binary, and may be three or more.
[0028]
In this example, accurate drive control can be performed by always generating a new pattern even if the rotating body 124 is deformed due to aging or thermal change.
[0029]
[2]Example 2: Reference example
  The case where the binary pattern capable of discriminating 0 and 1 as shown in FIG. 5 is generated on the end surface of the drum-shaped or columnar rotator as shown in FIG. 5 for the rotator 124 to be driven shown in FIG. It is form 2.
[0030]
When the drive control of the rotating body 124 is position control, the initial drive can be performed by setting the initial state of the initial drive to 0, that is, the origin. In the case of speed control, if the motor 109 is a DC motor, a constant current or voltage required for the initial drive may be input. If the motor 109 is a pulse motor, an initial pulse can be input by inputting a pulse required for the initial drive. Driving is performed, and the rotating body starts driving from there.
[0031]
The recording head 6 writes a binary pattern on the rotating body 124 that rotates by the initial drive. This binary pattern is a line 9 ′ directed in the normal direction (radial direction) to the axial end surface of the rotating body 124 as shown in FIG. However, it is possible to use a point instead of a line. If the writing speed is sufficiently higher than the rotation speed of the rotating body 124, a binary pattern is written in the radial direction of the end face of the rotating body. Even if the line is inclined with respect to the line, it can be measured with high accuracy. Furthermore, even a pattern with two or more values is possible.
[0032]
The detection head 7 reads the binary pattern recorded by the recording head 6. In the binary pattern, the speed can be obtained by measuring the time required to move the binary pulse width, or a certain time interval is determined and binary values within the time interval are determined. It is also possible to obtain the position by counting the number of pulses. This information is input to the signal processing unit 10 to generate a voltage or pulse corresponding to the position or speed of the rotating body 124.
[0033]
An output from the signal processing unit 10 is input to the control unit 11. The control unit 11 amplifies the output from the signal processing unit 10 when the rotating body 124 is different from the predetermined rotation, and controls the driving state of the drive motor 109 to match the rotation of the rotating body 124 with the predetermined rotation. A control signal is output.
[0034]
The driving force of the driving motor 109 is transmitted to the rotating body 124 through the transmission system 13, and the rotating body 124 rotates. The binary pattern detected by the detection head 7 is erased by the erase head 8.
[0035]
The recording head 6, the detection head 7 and the erasing head 8 constitute an example of an apparatus capable of recording, detecting and erasing a binary pattern in which 0 and 1 can be discriminated on the circumference of the rotating body.
[0036]
In this way, by erasing the binary pattern whose rotation can be distinguished from 0 and 1 and making it rewritable, the binary pattern can be refreshed even if the rotating body 124 changes over time or changes due to heat. Therefore, it is possible to always generate a binary pattern necessary for drive control. In addition, since the binary pattern is erased after being recorded and measured, it is not necessary to set the interval between the binary patterns as a divisor of the circumferential length of the rotating body end face, and the resolution required for drive control can be set arbitrarily. It is also possible to do.
[0037]
Here, the control unit 11 constitutes means for calculating the circumferential speed or circumferential position of the rotating body from the binary pattern detection information and controlling the circumferential speed or circumferential position of the rotating body based on the calculated information.
[0038]
The mechanism for generating the binary pattern is the same as in the first embodiment.
The second embodiment is advantageous when the binary pattern cannot be generated on the circumference of the rotating body as in the first embodiment. By generating the binary pattern on the outermost side of the end face, the rotation can be performed. It is also possible to measure information about the eccentricity of the body. Further, since it is sufficient that recording, detection, and erasing can be performed on the end face of the rotating body 124, the rotating body is an endless belt 21 as shown in FIG. 6, and the rewritable end face of the endless belt 21 in the rotation axis direction. It is also possible to perform drive control by recording a binary pattern.
[0039]
As shown in FIG. 6, there is an endless belt 21 that is stretched between the driving roller 19 and the driven roller 20. A recording head 6, a detection head 7, and an erasing head 8 are arranged on a non-illustrated immovable member so as to face the end face of the endless belt 21 (side end face in the direction orthogonal to the rotation direction). The detection head 7 and the erasing head 8 constitute an example of an apparatus capable of recording / detecting / erasing a binary pattern capable of discriminating 0 and 1 on the end face of the rotating body.
[0040]
As the drive roller 19 rotates, the belt 21 rotates. When the drive control is position control, initial drive is possible by setting the initial state of initial drive to 0, that is, the origin. In the case of speed control, if the motor 109 is a DC motor, a constant current or voltage required for the initial drive may be input. If the motor 109 is a pulse motor, an initial pulse can be input by inputting a pulse required for the initial drive. Driving is performed, from which the belt 21 as a rotating body starts driving.
[0041]
In FIG. 6, the recording head 6 writes a binary pattern, and the information of the binary pattern is read by the detection head 7. This information is input to the signal processing unit 10 to generate a voltage, voltage or pulse corresponding to the position or speed of the rotating body (belt 21). An output from the signal processing unit 10 is input to the control unit 11. The control unit 11 amplifies the output from the signal processing unit 10 when the drive roller 19 is different from the predetermined rotation, and controls the drive state of the drive motor 12 to change the rotation of the rotating body (belt 21) to the predetermined rotation. A control signal for matching is output.
[0042]
The driving force of the driving motor 109 is transmitted to the driving roller 19 through the transmission system 13, and the driving roller 19 rotates. As a result, the belt 21 rotates. The pattern detected by the detection head 7 is erased by the erase head 8. The mechanism for generating the binary pattern is the same as in the first embodiment.
[0043]
In this example, accurate drive control can be performed by always generating a new pattern even if the rotating body 124 is deformed due to aging or thermal change.
[0044]
[3]Example3:Implementation formstate(Claim2 related)
  For the rotating body 124 in FIG. 1, there is a case where a binary pattern as shown in FIG.This example3.
[0045]
When the drive control of the rotating body 124 is position control, the initial drive can be performed by setting the initial state of the initial drive to 0, that is, the origin. In the case of speed control, if the motor 109 is a DC motor, a constant current or voltage required for the initial drive may be input. If the motor 109 is a pulse motor, an initial pulse can be input by inputting a pulse required for the initial drive. Driving is performed, and the rotating body 124 starts driving from there.
[0046]
The recording head 3 and the detection head 4 are provided on an immovable member (not shown) so as to face the peripheral surface of the drum-shaped or columnar rotating body 124. The recording head 3 and the detection head 4 constitute an example of an apparatus capable of recording / detecting / erasing a binary pattern capable of discriminating 0 and 1 on the circumference of the rotating body.
[0047]
The recording head 3 writes a binary pattern on the rotating body 124 that rotates by the initial drive. This binary pattern is generated as a line 9 parallel to the axial direction of the rotating body on the circumference of the rotating body 124 using a slit 53 (see the above example) as shown in FIG. However, it is possible to use a point instead of a line. If the writing speed is sufficiently higher than the rotation speed of the rotating body 124, a binary pattern is written in the axial direction of the rotating body 124, and the rotation of the rotating body 124 causes an oblique pattern. Even if it becomes a line, it can be measured sufficiently with high accuracy. Furthermore, even a pattern with two or more values is possible.
[0048]
The detection head 4 reads the binary pattern recorded by the recording head 3. In the binary pattern, the speed can be obtained by measuring the time required to move the binary pulse width, or a certain time interval is determined and binary values within the time interval are determined. It is also possible to obtain the position by counting the number of pulses. This information is input to the signal processing unit 10 to generate a voltage or pulse corresponding to the position or speed of the rotating body 124.
[0049]
An output from the signal processing unit 10 is input to the control unit 11. The control unit 11 amplifies the output from the signal processing unit 10 when the rotating body 124 is different from the predetermined rotation, and controls the driving state of the motor 109 to match the rotation of the rotating body 124 with the predetermined rotation. Is output. The driving force of the driving motor 109 is transmitted to the rotating body 124 through the transmission system 13, and the rotating body 124 rotates.
[0050]
Here, the control unit 11 constitutes means for calculating the circumferential speed or circumferential position of the rotating body from the binary pattern detection information and controlling the circumferential speed or circumferential position of the rotating body based on the calculated information.
[0051]
  SaidofExampleIn 1, the erasing head 5 is located downstream of the recording head 3 in the rotation direction of the rotating body 124, and the binary pattern is erased. On the other hand, as in this example, for example, the deformation due to the initial environment where the rotating body 124 is installed is caused, but when the deformation with time is difficult to occur, the recording head 3 and the detection head 4 alone have sufficiently high accuracy. The drive control performance can be obtained. Further, since no erasing head is required, the cost can be kept low.
[0052]
Also, depending on the material of the rotator that writes the binary pattern, after recording the binary pattern on the rotator, for example, the binary pattern recorded in about half the circumference of the rotator becomes thin enough to be difficult to detect, Even in the case of disappearance, the erasing head is not necessary, and in this case, this embodiment is an effective means. The mechanism of binary pattern generation is the same as in the first embodiment.
[0053]
[4]Example4: Reference example
  For the rotating body 124 shown in FIG. 1, there is a case where a binary pattern capable of discriminating 0 and 1 is generated on the end face in the axial direction of the rotating body 124 as shown in FIG.This exampleIt is.
[0054]
When the drive control of the rotating body 124 is position control, the initial drive can be performed by setting the initial state of the initial drive to 0, that is, the origin. In the case of speed control, if the motor 109 is a DC motor, a constant current or voltage required for the initial drive may be input. If the motor 109 is a pulse motor, an initial pulse can be input by inputting a pulse required for the initial drive. Driving is performed, and the rotating body starts driving from there.
[0055]
In FIG. 8, the recording head 6 and the detection head 7 are supported by a non-illustrated immovable member so as to face the end face in the axial direction of the rotating body 124 and are arranged side by side on a virtual circle centered on the rotating shaft. The recording head 6 and the detection head 7 constitute an example of an apparatus capable of recording / detecting a binary pattern capable of discriminating 0 and 1 on the end face of the rotating body.
[0056]
The recording head 6 writes a binary pattern on the rotating body 124 that rotates by the initial drive. This binary pattern is formed by using a slit (slit 53 in the above example) as shown in FIG. 8, and is a normal direction (radial direction line) 9 ′ at the axial end face of the rotating body 124. However, it is also possible to use a point instead of a line. If the writing speed is sufficiently higher than the rotation speed of the rotating body 124, a binary pattern is written in the axial direction of the rotating body. Even then, it can be measured with high accuracy. Furthermore, even a pattern with two or more values is possible.
[0057]
The detection head 7 reads the binary pattern recorded by the recording head 6. In the binary pattern, the speed can be obtained by measuring the time required to move the binary pulse width, or a certain time interval is determined and binary values within the time interval are determined. It is also possible to obtain the position by counting the number of pulses.
[0058]
This information is input to the signal processing unit 10 to generate a voltage, voltage or pulse corresponding to the position or speed of the rotating body 124. An output from the signal processing unit 10 is input to the control unit 11. The control unit 11 amplifies the output from the signal processing unit 10 when the rotation body 124 is different from the predetermined rotation, and controls the driving state of the drive motor 109 to match the rotation of the rotation body 124 with the predetermined rotation. A signal is output. The driving force of the driving motor 109 is transmitted to the rotating body 124 through the transmission system 13, and the rotating body 124 rotates.
[0059]
Here, the control unit 11 constitutes means for calculating the circumferential speed or circumferential position of the rotating body from the binary pattern detection information and controlling the circumferential speed or circumferential position of the rotating body based on the calculated information.
[0060]
  Example above2 has an erasing head downstream of the detection head 7 and erases the binary pattern. However, as in this example, for example, deformation due to the initial environment in which the rotating body 124 is installed is caused, but deformation with time is caused. If it is difficult, it is possible to obtain sufficiently high precision drive control performance even with a mechanism using only the recording head 6 and the detection head 7. Further, since no erasing head is required, the cost can be kept low.
[0061]
Further, depending on the material for writing the binary pattern on the rotator 124, after the binary pattern is recorded on the rotator 124, for example, the binary pattern recorded about half a circumference of the rotator 124 becomes thin enough to be difficult to detect. Even in the case where it disappears or disappears, the erasing head is not necessary, and this embodiment is also an effective means. The mechanism of binary pattern generation is the same as in the first embodiment.
[0062]
[5]Example5: Implementation formstate(Claim1, 2,5Relation)
  FIG. 9 shows an embodiment of the present invention.StateShow. The form of this implementationState2 is an example of an image forming apparatus including a color copying machine. In FIG. 9, reference numeral 100 denotesThis exampleImage forming device main bodyIndicate. The apparatus main body 100 includes a drum-shaped photoconductor 112 as an image carrier, slightly to the right of the center in the exterior case 110. Around the photosensitive member 112, a rotating type developing device 114 as an developing unit, an intermediate transfer unit 115, and a cleaning device 116 are sequentially arranged in a rotating direction (counterclockwise direction) indicated by an arrow from a charger 113 installed thereon. A static eliminator 117 is disposed.
[0063]
On these charger 113, rotary developing device 114, cleaning device 116, and static eliminator 117, an optical writing device as an exposure unit, for example, a laser writing device 18 is installed. The rotary developing device 114 includes developing devices 220A, 220B, 220C, and 220D having developing rollers 211 that respectively store yellow, magenta, cyan, and black toners, and rotate around the central axis to develop each color. The devices 220A, 220B, 220C, and 220D are selectively moved to a development angle displacement that faces the outer periphery of the photoreceptor 112.
[0064]
In the intermediate transfer unit 115, an endless intermediate transfer member as an image carrier, for example, an intermediate transfer belt 24, is wound around a plurality of rollers 153, and the intermediate transfer belt 24 is in contact with the photosensitive member 112. A transfer device 25 is installed inside the intermediate transfer belt 24, and a secondary transfer device 26 and a cleaning device 27 are installed outside the intermediate transfer belt 24. The cleaning device 27 is provided so as to be able to contact with and separate from the intermediate transfer belt 24.
[0065]
The laser writing device 18 receives an image signal of each color from the image reading device 29 via an image processing unit (not shown), and applies a laser beam L, which is sequentially modulated by the image signal of each color, to the uniformly charged photoreceptor 112. Irradiation exposes the photoconductor 112 to form an electrostatic latent image on the photoconductor 112.
[0066]
The image reading device 29 color-separates and reads an image of the document G set on the document table 30 provided on the upper surface of the apparatus main body 100, and converts it into an electrical image signal. The sheet-like medium conveyance path 32 conveys a sheet-like medium such as paper from right to left. In the sheet-like medium conveyance path 32, a registration roller 33 is installed in front of the intermediate transfer unit 115 and the secondary transfer device 26, and a conveyance belt 34 and a fixing device 35 are disposed downstream of the intermediate transfer unit 115 and the secondary transfer device 26. A paper discharge roller 36 is disposed.
[0067]
The apparatus main body 100 is placed on a sheet feeding device 150. A plurality of paper feed cassettes 151 are provided in multiple stages in the paper feed device 150, and any one of the paper feed rollers 152 is selectively driven to feed a sheet-like medium from any one of the paper feed cassettes 151. It is. The sheet-like medium is conveyed to the sheet-like medium conveyance path 32 through the automatic sheet feeding path 37 in the apparatus main body 100. Here, the sheet feeding roller 152 is a roller that rotates while pressing the sheet-like medium, and has a function of conveying the sheet-like medium by a predetermined amount at a predetermined timing. Therefore, the first to fourth embodiments are applied as described above. By doing so, strict feed control is realized, and as a result, a high-quality image can be obtained.
[0068]
A manual feed tray 38 is provided on the right side of the apparatus main body 100 so as to be openable and closable. A sheet-like medium inserted from the manual feed tray 38 passes through a manual feed path 39 in the apparatus main body 100 to the sheet-like medium conveyance path 32. Be transported. A sheet discharge tray (not shown) is detachably attached to the left side of the apparatus main body 100, and the sheet medium discharged by the sheet discharge roller 36 through the sheet medium conveyance path 32 is accommodated in the sheet discharge tray.
[0069]
  This example5, when making a color copy, when a document G is set on the document table 30 and a start switch (not shown) is pressed, a copying operation is started. First, the image reading device 29 separates and reads the image of the document G on the document table 30. At the same time, a sheet-like medium is selectively sent out from a paper feeding cassette 151 in the paper feeding device 150 by a paper feeding roller 152, and this sheet-like medium passes through an automatic paper feeding path 37 and a sheet-like medium conveying path 32 to a registration roller 33. It stops when it hits.
[0070]
The photoconductor 112 rotates counterclockwise, and the intermediate transfer belt 24 rotates clockwise by the rotation of the driving roller of the plurality of rollers 223. The photosensitive member 112 is uniformly charged by the charger 113 as it rotates, and laser light modulated by the first color image signal applied from the image reading device 29 to the laser writing device 18 via the image processing unit is laser-induced. Irradiation from the writing device 18 forms an electrostatic latent image.
[0071]
The electrostatic latent image on the photoconductor 112 is developed by the first color developing device 220A of the rotary developing device 114 to become a first color image. The first color image on the photoconductor 112 is intermediated by the primary transfer device 25. The image is transferred to the transfer belt 24. The photosensitive member 112 is cleaned by the cleaning device 16 after the image of the first color is transferred, the residual toner is removed, and the charge is removed by the charge eliminator 17.
[0072]
Subsequently, the photosensitive member 112 is uniformly charged by the charger 113, and laser light modulated by the image signal of the second color applied from the image reading device 29 to the laser writing device 18 through the image processing unit is laser-written. Irradiation from the device 18 forms an electrostatic latent image. The electrostatic latent image on the photoconductor 112 is developed by the second color developing device 220B of the rotary developing device 114 to become a second color image, and the second color image on the photoconductor 112 is intermediated by the primary transfer device 25. The image is transferred onto the transfer belt 24 so as to overlap the first color image. The photoreceptor 112 is cleaned by the cleaning device 116 after the transfer of the second color image to remove the residual toner, and is neutralized by the static eliminator 117.
[0073]
Next, the photosensitive member 112 is uniformly charged by the charger 113, and laser light modulated by the third color image signal applied from the image reading device 29 to the laser writing device 18 through the image processing unit is laser-written. Irradiation from the device 18 forms an electrostatic latent image. The electrostatic latent image on the photoconductor 112 is developed by the third color developing device 220C of the rotary developing device 114 to become a third color image, and the third color image on the photoconductor 112 is intermediated by the primary transfer device 25. The first color image and the second color image are superimposed and transferred onto the transfer belt 24. The photosensitive member 112 is cleaned by the cleaning device 116 after the transfer of the image of the third color to remove the residual toner, and is discharged by the charge eliminator 117.
[0074]
Further, the photoconductor 112 is uniformly charged by the charger 113, and the laser beam modulated by the image signal of the fourth color applied from the image reading device 29 to the laser writing device 18 through the image processing unit is a laser writing device. Irradiation from 18 forms an electrostatic latent image. The electrostatic latent image on the photoconductor 112 is developed by the fourth color developing device 220D of the rotary developing device 114 to become a fourth color image, and the fourth color image on the photoconductor 112 is intermediated by the primary transfer device 25. A full-color image is formed on the transfer belt 24 by being transferred onto the first color image, the second color image, and the third color image. The photoconductor 112 is cleaned by the cleaning device 116 after the transfer of the image of the fourth color to remove residual toner, and is neutralized by the static eliminator 117.
[0075]
Then, the registration roller 33 rotates at the timing to feed the sheet-like medium, and the full-color image on the intermediate transfer belt 24 is transferred to the sheet-like medium by the secondary transfer device 26. The sheet-like medium is transported by the transport belt 34, the full color image is fixed by the fixing device 35, and is discharged to the paper discharge tray by the paper discharge roller 36. Further, the intermediate transfer belt 24 is cleaned by the cleaning device 27 after the transfer of the full color image to remove the residual toner.
[0076]
  Here, the registration roller 33 is a roller that rotates while applying pressure to the sheet-like medium.ExampleAny one of 1-4 is applicable.
[0077]
The operation for forming a four-color superimposed image has been described above. In the case of forming a three-color superimposed image, three different single-color images are sequentially formed on the photoconductor 112 and transferred onto the intermediate transfer belt 24. In the case where a two-color superimposed image is formed after being collectively transferred to a sheet-like medium, two different single-color images are sequentially formed on the photosensitive member 112 and transferred onto the intermediate transfer belt 24 in an overlapping manner. It is collectively transferred to a sheet-like medium. When a single color image is formed, one single color image is formed on the photoconductor 112, transferred onto the intermediate transfer belt 24, and then transferred to a sheet-like medium.
[0078]
In such a color copying machine, the rotation accuracy of the fixing roller, the pressure roller, and the registration roller 33 in the photoconductor 112 as the image carrier, the intermediate transfer belt 24 and the fixing device 35 greatly affects the quality of the final image, It is desired to drive the image carrier (photoconductor 112, intermediate transfer belt 24) with higher accuracy.
[0079]
  Therefore,BookExample5Then, the driving of the photoconductor 112 is the aforementionedExampleThis is performed by a rotating body driving device to which any one of 1 to 4 is applied. Similarly, the intermediate transfer belt 24, the fixing roller 35a of the fixing device 35, the pressure roller 35b, and the registration roller 33 are driven as described above.ExampleIt can be performed by the rotating body driving device according to any one of 1 to 4. As for the fixing roller 35a and the pressure roller 35b, when one is configured as a driving side and the other is configured as a driven side, a photoreceptor driving device is applied to the driving side.
[0080]
  BookExample5According to the present invention, the image bearing member (photoconductor 112, intermediate transfer belt 24) and the fixing roller 35a, the pressure roller 35b, and the registration roller 33 in the fixing device 35 are driven by the rotating body driving device according to the above-described embodiment. As a result, the drive accuracy of the image carrier is improved, and the impact of shock loads that tend to occur when moving from the paper feed tray to the image carrier or from the image carrier to the fixing unit is reduced. Paper transport can be performed, and a high-quality image can be obtained.
[0081]
  In this example, the photoconductor 112 is a rotating body in the present invention, and is described above.ExampleBy applying the configurations 1 to 4, it is possible to construct a highly accurate drive system and always obtain a high-quality image.
[0082]
[6]Example 6:Embodiment (Claims)1, 2, 6 related)
  FIG.Example 6Indicates. This example is an example of an image forming apparatus including a color copying machine. The photoreceptor 1 as an image carrier has an endless belt shape in which a photosensitive layer such as an organic optical semiconductor (OPC) is formed in a thin film shape on the outer peripheral surface of a belt base material. The photoreceptor 1 is supported by three photoreceptor transport rollers 62 to 64, and is rotated in the direction of arrow A by a drive motor (not shown).
[0083]
Around the photoreceptor 1, in order of rotation of the photoreceptor 1 indicated by an arrow A, a charger 65, an exposure optical system (hereinafter referred to as LSU) 66 as exposure means, black, yellow, magenta, and cyan are developed. The devices 67 to 80, the intermediate transfer unit 81, the photosensitive member cleaning means 82, and the static eliminator 83 are provided. The charger 65 is applied with a high voltage of about −4 to 5 kV from a power supply device (not shown), and charges the portion of the photoreceptor 1 facing the charger 65 to give a uniform charging potential.
[0084]
The LSU 66 sequentially modulates light intensity or pulse width of each color image signal from a gradation converting means (not shown) by a laser driving circuit (not shown), and a semiconductor laser (not shown) using the modulated signal. , The exposure light beam 84 is obtained, and the photosensitive member 1 is scanned by the exposure light beam 84 to sequentially form electrostatic latent images corresponding to the image signals of the respective colors on the photosensitive member 1. The seam sensor 85 detects the seam of the photoconductor 1 formed in a loop shape. When the seam sensor 85 detects the seam of the photoconductor 1, the seam sensor 85 avoids the seam of the photoconductor 1 and for each color. The timing controller 86 controls the light emission timing of the LSU 66 so that the electrostatic latent image formation angular displacement is the same.
[0085]
Each of the developing devices 67 to 80 stores toner corresponding to each developing color, and is selectively applied to the photosensitive member 1 at a timing corresponding to the electrostatic latent image corresponding to the image signal of each color on the photosensitive member 1. By abutting and developing the electrostatic latent image on the photoreceptor 1 with toner to form an image of each color, a full-color image is formed by a four-color superimposed image.
[0086]
  The intermediate transfer unit 81 includes an intermediate transfer drum 87 as an intermediate transfer member in which a belt-like sheet made of a conductive resin or the like is wound around a metal tube such as aluminum, and an intermediate transfer member in which rubber or the like is formed in a blade shape. It consists of cleaning means 88 and insideTumblingWhile the four-color superimposed image is formed on the transfer drum 87, the intermediate transfer member cleaning unit 88 is separated from the intermediate transfer drum 87.
[0087]
The intermediate transfer member cleaning unit 88 contacts the intermediate transfer drum 87 only when the intermediate transfer drum 87 is cleaned, and removes toner remaining without being transferred from the intermediate transfer drum 87 to the recording paper 89 as a sheet-like medium.
[0088]
The recording paper is sent one by one from the recording paper cassette 90 to the paper transport path 92 by the paper feeding roller 91, and the feeding is temporarily stopped at the position of the registration roller 55 comprising a pair of rollers, and the feeding timing is adjusted. Then, the recording paper 89 is sandwiched between the pair of rollers in synchronization with the superimposed image on the intermediate transfer drum 87 and rotated and sent out. The recording sheet 89 sent out in this way is transferred onto the recording sheet by the transfer unit 93 with the superimposed image on the intermediate transfer drum 87.
[0089]
Here, the paper feed roller 91 constitutes a sheet-like medium conveying unit that rotates the recording paper 89 in the recording paper cassette 90 while pressing the recording paper 89 and conveys the recording paper 89.
[0090]
The transfer unit 93 serving as a transfer unit transfers the full color image on the intermediate transfer drum 87 to the recording paper 89, and includes a transfer belt 94 in which conductive rubber or the like is formed in a belt shape, and the intermediate transfer drum 87. A transfer device 95 that applies a transfer bias for transferring a full-color image to the recording paper 89 to the intermediate transfer drum 87, and the recording paper 89 is electrostatically transferred to the intermediate transfer drum 87 after the full-color image is transferred to the recording paper 89. The separator 96 is configured to apply a bias to the intermediate transfer drum 87 so as to prevent sticking.
[0091]
The fixing device 97 includes a heat roller 98 having a heat source therein and a pressure roller 99. The full-color image transferred onto the recording paper 89 is rotated between the heat roller 98 and the pressure roller 99 by sandwiching the recording paper. Accordingly, pressure and heat are applied to the recording paper 89 to fix the full color image on the recording paper 89 to form a full color image.
[0092]
The operation of the sixth embodiment configured as described above will be described below. Here, the description will proceed assuming that the development of the electrostatic latent image is performed in the order of black, cyan, magenta, and yellow.
[0093]
The photoreceptor 1 and the intermediate transfer drum 87 are driven in the directions of arrows A and B by respective drive sources (not shown). In this state, first, a high voltage of about −4 to 5 kV is applied to the charger 65 from a power supply device (not shown), and the charger 65 uniformly charges the surface of the photoreceptor 1 to about −700V. Next, after the seam sensor 85 detects the joint of the photosensitive member 1 and a predetermined time has passed so as to avoid the joint of the photosensitive member 1, the laser beam corresponding to the black image signal from the LSU 66 is applied to the photosensitive member 1. The exposure light beam 84 is irradiated, and the charge on the photosensitive member 1 where the exposure light beam 84 is irradiated disappears to form an electrostatic latent image.
[0094]
On the other hand, the black developing device 67 is brought into contact with the photosensitive member 1 at a predetermined timing. The black toner in the black developing unit 67 is given a negative charge in advance, and the black toner adheres only to the portion (electrostatic latent image portion) where the charge has disappeared due to the irradiation of the exposure light beam 84 on the photoreceptor 1. Development is performed by a so-called negative positive process. The black toner image formed on the surface of the photoreceptor 1 by the black developing device 67 is transferred to the intermediate transfer drum 87. Residual toner that has not been transferred from the photoreceptor 1 to the intermediate transfer drum 87 is removed by the photoreceptor cleaning means 82, and the charge on the photoreceptor 1 is removed by the charge eliminator 83.
[0095]
Next, the charger 65 uniformly charges the surface of the photoreceptor 1 to about −700V. Then, after the seam sensor 85 detects the joint of the photoconductor 1 and after a predetermined time has passed so as to avoid the joint of the photoconductor 1, exposure of the laser beam corresponding to the cyan image signal from the LSU 66 to the photoconductor 1 is performed. The photosensitive member 1 is irradiated with the light beam 84, and the charge of the portion irradiated with the exposure light beam 84 disappears to form an electrostatic latent image.
[0096]
On the other hand, a cyan developing device 68 is brought into contact with the photosensitive member 1 at a predetermined timing. The cyan toner in the cyan developing device 68 is given a negative charge in advance, and the cyan toner adheres only to the portion (electrostatic latent image portion) where the charge has disappeared due to the irradiation of the exposure light beam 84 on the photoreceptor 1. Development is performed by a so-called negative-positive process. The cyan toner image formed on the surface of the photoreceptor 1 by the cyan developing device 68 is transferred onto the intermediate transfer drum 87 so as to overlap the black toner image. Residual toner that has not been transferred from the photoreceptor 1 to the intermediate transfer drum 87 is removed by the photoreceptor cleaning means 82, and the charge on the photoreceptor 1 is removed by the charge eliminator 83.
[0097]
Next, the charger 65 uniformly charges the surface of the photoreceptor 1 to about −700V. Then, after the seam sensor 85 detects the joint of the photoconductor 1 and after a certain time has passed so as to avoid the joint of the photoconductor 1, exposure of the laser beam corresponding to the magenta image signal from the LSU 66 to the photoconductor 1 is performed. The photosensitive member 1 is irradiated with the light beam 84, and the charge of the portion irradiated with the exposure light beam 84 disappears to form an electrostatic latent image.
[0098]
On the other hand, a magenta developing device 69 is brought into contact with the photosensitive member 1 at a predetermined timing. The magenta toner in the magenta developing device 69 is given a negative charge in advance, and the magenta toner adheres only to the portion (electrostatic latent image portion) where the charge has disappeared due to the irradiation of the exposure light beam 84 on the photoreceptor 1. Development is performed by a so-called negative-positive process. The magenta toner image formed on the surface of the photoreceptor 1 by the magenta developing device 69 is transferred onto the intermediate transfer drum 87 so as to overlap the black toner image and the cyan toner image. Residual toner that has not been transferred from the photoreceptor 1 to the intermediate transfer drum 87 is removed by the photoreceptor cleaning means 82, and the charge on the photoreceptor 1 is removed by the charge eliminator 83.
[0099]
Further, the charger 65 uniformly charges the surface of the photoreceptor 1 to about −700V. Then, after the seam sensor 85 detects the joint of the photoconductor 1 and a predetermined time has passed so as to avoid the joint of the photoconductor 1, exposure of the laser beam corresponding to the yellow image signal from the LSU 66 to the photoconductor 1 is performed. The photosensitive member 1 is irradiated with the light beam 84, and the charge of the portion irradiated with the exposure light beam 84 disappears to form an electrostatic latent image.
[0100]
On the other hand, the yellow developing device 70 is brought into contact with the photosensitive member 1 at a predetermined timing. The yellow toner in the yellow developing device 70 is given a negative charge in advance, and the yellow toner adheres only to the portion (electrostatic latent image portion) where the charge has disappeared due to the irradiation of the exposure light beam 84 on the photoreceptor 1. Development is performed by a so-called negative-positive process. The yellow toner image formed on the surface of the photoreceptor 1 by the yellow developing unit 70 is transferred onto the intermediate transfer drum 87 so as to overlap the black toner image, the cyan toner image, and the magenta toner image, and a full color image is formed on the intermediate transfer drum 87. It is formed. Residual toner that has not been transferred from the photoreceptor 1 to the intermediate transfer drum 87 is removed by the photoreceptor cleaning means 82, and the charge on the photoreceptor 1 is removed by the charge eliminator 83.
[0101]
In the full-color image formed on the intermediate transfer drum 87, the transfer unit 93 that has been separated from the intermediate transfer drum 87 until now contacts the intermediate transfer drum 87, and a high voltage of about +1 kV is applied to the transfer device 95 by the power supply device ( By being applied from the recording paper cassette 90, the transfer device 95 collectively transfers the recording paper 89 conveyed along the paper conveyance path 92 from the recording paper cassette 90.
[0102]
Further, a voltage is applied from the power supply device to the separator 96 so that an electrostatic force that attracts the recording paper 89 acts, and the recording paper 89 is peeled off from the intermediate transfer drum 87. Subsequently, the recording paper 89 is sent to the fixing device 97, where the full color image is fixed by the nipping pressure between the heat roller 98 and the pressure roller 99 and the heat of the heat roller 98, and the paper discharge tray 60 sets the paper discharge tray. 61 is discharged.
[0103]
Further, residual toner on the intermediate transfer drum 87 that has not been transferred onto the recording paper 89 by the transfer unit 93 is removed by the intermediate transfer member cleaning means 18. The intermediate transfer member cleaning device 88 is angularly displaced away from the intermediate transfer drum 87 until a full color image is obtained. After the full color image is transferred to the recording paper 19, it contacts the intermediate transfer drum 87 and is on the intermediate transfer drum 87. Residual toner is removed. The full color image formation for one sheet is completed by the series of operations described above.
[0104]
In such a color copying machine, the rotational accuracy of the image carrier (photosensitive member 1, intermediate transfer drum 87), paper feed roller 91, registration roller 55, heat roller 98 constituting the fixing device, pressure roller 99, etc. is high. The quality of the final image is greatly affected, and high-precision driving of a particularly high-precision image carrier (photosensitive member 1, intermediate transfer drum 87) is desired.
[0105]
  Therefore,BookExample6In the example shown in FIG. 1, the image carrier (photosensitive member 1, intermediate transfer drum 87), paper feed roller 91, registration roller 55, heat roller 98 constituting the fixing device, and pressure roller 99 are driven. This is done by the driving device.
[0106]
  BookExample61, the image carrier (photosensitive member 1, intermediate transfer drum 87), paper feed roller 91, registration roller 55, heat roller 98, pressure roller 99, etc. are driven by the rotating body driving device shown in FIG. This improves the drive accuracy of the image carrier and reduces the impact of shock loads that tend to occur when moving from the paper feed tray to the image carrier or from the image carrier to the fixing unit. Paper transport can be performed, and a high-quality image can be obtained.
[0107]
[7]Example 7:Implementation formstate(Claim1, 2,5Relation)
  Figure 11Example 7Indicates.BookThe example is an example of a tandem image forming apparatus.BookIn the example, a plurality of image forming units 221Bk and 221M that form images of a plurality of colors, for example, black (hereinafter referred to as Bk), magenta (hereinafter referred to as M), yellow (hereinafter referred to as Y), and cyan (hereinafter referred to as C), respectively. 221Y and 221C are arranged in the vertical direction. The image forming units 221Bk, 221M, 221Y, and 221C are drum-shaped photosensitive members 222Bk, 222M, 222Y, and 222C, respectively, and charging devices (for example, contact charging). Apparatus) 223Bk, 223M, 223Y, 223C, developing devices 224Bk, 224M, 224Y, 224C, cleaning devices 225Bk, 225M, 225Y, 225C, and the like.
[0108]
The photoreceptors 222Bk, 222M, 222Y, and 222C are arranged in the vertical direction so as to face the endless conveyance direct transfer belt 226, and are driven to rotate at the same peripheral speed as the conveyance direct transfer belt 226. The photosensitive members 222Bk, 222M, 222Y, and 222C are uniformly charged by the charging devices 223Bk, 223M, 223Y, and 223C, respectively, and then exposed by the optical writing devices 227Bk, 227M, 227Y, and 227C as exposure units, respectively. An electrostatic latent image is formed.
[0109]
The optical writing devices 227Bk, 227M, 227Y, and 227C drive the semiconductor laser by the semiconductor laser driving circuit according to the image signals of Y, M, C, and Bk colors, respectively, and the laser beams from the semiconductor lasers are polygon mirrors 229Bk, 229M, and 229Y. 229C is deflected and scanned, and each laser beam from the polygon mirrors 229Bk, 229M, 229Y, and 229C is imaged on the photosensitive members 222Bk, 222M, 222Y, and 222C via an unillustrated fθ lens and mirror, thereby providing a photosensitive member. The 222Bk, 222M, 222Y, and 222C are exposed to form an electrostatic latent image.
[0110]
The electrostatic latent images on the photoreceptors 222Bk, 222M, 222Y, and 222C are developed by developing devices 224Bk, 224M, 224Y, and 224C, respectively, and become toner images of Bk, M, Y, and C colors. Therefore, the charging devices 223Bk, 223M, 223Y, 223C, the optical writing devices 227Bk, 227M, 227Y, 227C and the developing devices 224Bk, 224M, 224Y, 224C are Bk, M, Y on the photoreceptors 222Bk, 222M, 222Y, 222C. , C constitutes an image forming means for forming each color image (toner image).
[0111]
On the other hand, a sheet-like medium such as plain paper or an OHP sheet is supplied from a sheet feeding device 230 configured using a sheet feeding cassette, which is installed in the lower part of the image forming apparatus according to the present example, into a sheet form in the sheet feeding device. The sheet is fed by rotation of a sheet feeding roller 250 that rotates while pressing the medium, and is fed to a registration roller 231 along a sheet-shaped medium conveyance path. The registration roller 231 is a first color image forming unit (first on a sheet-shaped medium). An image forming unit for transferring an image on the photosensitive member) 221Bk and a toner image on the photosensitive member 222Bk in synchronization with the rotation of the registration roller 231 to convey the sheet-like medium. Transfer nip between the direct transfer belt 226 and the photosensitive member 222Bk Send to the department.
[0112]
The conveyance direct transfer belt 226 is stretched around a driving roller 232 and a driven roller 233 arranged in the vertical direction, and the driving roller 232 is rotationally driven by a driving unit (not shown), so that the conveyance direct transfer belt 226 is photoreceptors 222Bk, 222M, and 222Y. , Rotate at the same peripheral speed as 222C. The transfer sheet-like medium fed from the registration roller 231 is carried on the conveyance direct transfer belt 226 and conveyed, and toner images of Bk, M, Y, and C colors on the photosensitive members 222Bk, 222M, 222Y, and 222C are formed. A full-color image is formed by sequentially transferring images while passing through a transfer region where the action of the electric field formed by the corona discharge devices 234Bk, 234M, 234Y, and 234C as transfer means is formed, and at the same time, directly transporting It is electrostatically attracted to the transfer belt 226 and reliably conveyed. As described above, the conveyance direct transfer belt 226 is a direct transfer belt that passes a transfer region on which a sheet-like medium is placed.
[0113]
The sheet-like medium is gradually electrified by a separation charger 236 as a separation means and separated from the conveyance direct transfer belt 226, and then a full-color image is fixed by a fixing device 237, and is discharged to the upper part of the present embodiment by a discharge roller 238. The paper is discharged to the provided paper discharge unit 239. The photoreceptors 222Bk, 222M, 222Y, and 222C are cleaned by the cleaning devices 225Bk, 225M, 225Y, and 225C after the toner image is transferred to prepare for the next image forming operation.
[0114]
In such a color copying machine, the photosensitive members 222Bk, 222M, 222Y, and 222C as image carriers, the registration rollers 231, the fixing roller 237a that constitutes the fixing device 237, the pressure roller 237b, and the conveyance direct transfer belt 226 rotate. The accuracy greatly affects the quality of the final image, and the higher-precision photoconductors 222Bk, 222M, 222Y, and 222C, the registration roller 231, the fixing roller 237a that constitutes the fixing device 237, the pressure roller 237b, and the conveyance direct transfer belt 226 Drive is desired.
[0115]
  Therefore,Example 7Then, the image carrier 222Bk, 222M, 222Y, 222C, the registration roller 231, the fixing roller 237a of the fixing device 237, the pressure roller 237b, and the conveyance direct transfer belt 226 are driven in any of the first to fourth embodiments. It can be performed by the rotating body driving device shown.
[0116]
  Example 7In the image forming apparatus for forming a color image by rotating a plurality of photoconductors 222Bk, 222M, 222Y, 222C, a registration roller 231, a fixing roller 237a of the fixing device 237, a pressure roller 237b, and a conveyance direct transfer belt 226, At least one, preferably all, of the plurality of photosensitive members 222Bk, 222M, 222Y, and 222C, and the driving of the registration roller 231, the fixing roller 237a of the fixing device 237, the pressure roller 237b, and the conveyance direct transfer belt 226 are driven. Is performed by the rotating body driving device according to any one of the first to fourth embodiments described above, so that the driving accuracy of these rotating bodies is improved. Further, the influence of a shock load or the like that is likely to occur when moving from the sheet feeding device 230 to the transfer region (a portion where each photoconductor and each corona discharger face) or from the transfer region to the fixing device 237 is reduced. High-precision paper conveyance drive can be performed, and high-quality images can be obtained.
[0117]
[8] Example 8: Reference example
  FIG.referenceAn example is shown.BookThe example is an example of the traveling body driving device of the image reading device..In the image reading apparatus shown in FIG. 12, reference numeral 901 is a document to be read, reference numeral 902 is a document table on which the document 901 is placed, reference numeral 903 is a document illumination system for irradiating the document 901 with light, and reference numeral 904 is reflected light. An axis, reference numeral 905 is an element for reading, for example, a CCD (Charge Coupled Device), reference numeral 906 indicates an imaging lens, and reference numeral 907 indicates a total reflection mirror.
[0118]
Reference numeral 908 denotes a photoelectric conversion unit on which these document illumination system 903, CCD 905, lens 906, mirror 907 and the like are mounted, 909 and 910 are sub-scanning driving pulleys, 911 is a wire, and M is a driving motor. Reference numeral 912 denotes a housing of an image reading apparatus (image scanner).
[0119]
A photoelectric conversion unit 908 for reading an original is fixed to a part of the wire 911, and is a traveling body that moves as the wire 911 moves as the pulleys 909 and 910 rotate. The pulley 909 is a drive pulley and is configured coaxially with the pulley 914. The pulley 914 and the pulley 915 are wound around a timing belt 916, and the pulley 915 is directly connected to the rotating shaft of the driving motor M.
[0120]
The rotation of the motor M is transmitted in the order of the pulley 915, the timing belt 916, and the pulley 914 to rotate the pulley 909, and the photoelectric conversion unit 908 moves together with the wire 911 accordingly. The motor M is fixed to the housing 912. By the forward / reverse driving of the motor M, the photoelectric conversion unit 908 travels in the sub-scanning direction (left and right direction in the drawing) of the document 901.
[0121]
The motor M, the pulleys 914 and 915, the timing belt 916, the pulleys 909 and 910, the wire 911, and the like constitute a traveling body drive device that travels the photoelectric conversion unit 908 as the traveling body. The photoelectric conversion unit 908 travels in the sub-scanning direction.
[0122]
The photoelectric conversion unit 908 is also provided with a reading illumination system 903 such as a fluorescent lamp. When the vehicle is traveling, the reading illumination system 903 illuminates the document 901 on the document table 902 and reflects the reflected light beam (light). The axis 904 is folded by a plurality of mirrors 907, and an image of the original 901 is formed on a light receiving portion of an image sensor such as a CCD 905 via an imaging lens 906.
[0123]
The photoelectric conversion unit 908 scans the entire surface of the document 901 to read the entire document. Further, the sensor 913 indicating the reading start displacement is installed below the end portion of the document 901 so that the photoelectric conversion unit 908 is in a steady state of rising constant velocity between the home position H and the reading start position S. It is designed to start reading after reaching the reading start position S.
[0124]
In this example, the driving of the motor M, which is one component of the traveling body driving apparatus that drives the photoelectric conversion unit 908 to travel, is performed by applying the rotating body driving apparatus according to any one of the first to fourth embodiments. For example, the examples of FIGS. 2, 5, 7, and 8 are applied to any of the pulleys 909, 910, 914, and 915. Alternatively, the motor M is controlled by applying the example of FIG. 6 to the timing belt 916.
[0125]
According to this example, since the control of the motor M related to the running of the photoelectric conversion unit 908 is performed by the rotating body driving device described in the above embodiment, the running accuracy of the photoelectric conversion unit as the running body is improved and high accuracy is achieved. A traveling body drive can be performed and a high quality read image can be obtained.
[0126]
【The invention's effect】
  In the invention of claim 1, the rotating bodyElectrostatic latent image carrier configured asEven if it is deformed due to aging or heat changeThe recording layer on the peripheral surface of the electrostatic latent image carrier has the property of being in an amorphous state or a crystalline state depending on the intensity of irradiation light.Always newBinaryAccurate drive control can be performed by generating a pattern.
  In the invention of claim 2,In the case of an electrostatic latent image carrier that is subject to deformation due to the initial environment where the rotating body is installed, but is less likely to undergo deformation over time, the intensity of irradiation light that the recording layer on the peripheral surface of the electrostatic latent image carrier has Accordingly, it is possible to obtain drive control with sufficiently high accuracy by utilizing the property of becoming an amorphous state or a crystalline state. In addition, since an erasing device is not required, the cost can be kept low.
  According to the fifth to seventh aspects of the present invention, it is possible to construct a high-accuracy drive system and always obtain a high-quality image.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a drive control system for a rotating body.
FIG. 2 is a block diagram illustrating a control system for driving a rotating body.
FIG. 3 is a schematic configuration diagram illustrating a detailed configuration of a recording head and an erasing head.
FIG. 4 is a schematic configuration diagram illustrating a detailed configuration of a recording head.
FIG. 5 is a block diagram illustrating a control system for driving a rotating body.
FIG. 6 is a block diagram illustrating a control system for driving a rotating body.
FIG. 7 is a block diagram illustrating a control system for driving a rotating body.
FIG. 8 is a block diagram illustrating a control system for driving a rotating body.
FIG. 9 is a configuration diagram of an image forming apparatus.
FIG. 10 is a configuration diagram of an image forming apparatus.
FIG. 11 is a configuration diagram of an image forming apparatus.
FIG. 12 is a configuration diagram of an image reading apparatus.
[Explanation of symbols]
3, 6 Recording head
4, 7 Detection head
5, 8 Erase head
9, 9 'line
124 Rotating body

Claims (7)

In the rotating body drive device comprising a control means for controlling the circumferential speed or the circumferential position of the electrostatic latent image carrier,
The electrostatic latent image carrier has a recording layer on a peripheral surface,
A recording apparatus for recording a binary pattern capable of discriminating 0 and 1 on the recording layer;
A detection device for detecting a binary pattern recorded by the recording device;
An erasing device for erasing the binary pattern recorded by the recording device after the detection device detects the binary pattern;
With
The rotator driving device according to claim 1, wherein the recording layer is in an amorphous state or a crystalline state depending on the intensity of irradiation light from the recording device, and forms a binary pattern in which 0 and 1 can be distinguished . In the rotating body drive device comprising a control means for controlling the circumferential speed or the circumferential position of the electrostatic latent image bearing member that causes deformation due to the initial environment but hardly undergoes deformation over time,
The electrostatic latent image carrier has a recording layer on a peripheral surface,
A recording apparatus for recording a binary pattern capable of discriminating 0 and 1 on the recording layer;
A detection device for detecting a binary pattern recorded by the recording device;
With
The rotator driving device according to claim 1, wherein the recording layer is in an amorphous state or a crystalline state depending on the intensity of irradiation light from the recording device, and forms a binary pattern in which 0 and 1 can be distinguished . In the rotating body drive device according to claim 1 or 2,
The rotating body driving device according to claim 1, wherein the recording layer is in an amorphous state when receiving light exceeding a predetermined intensity, and is in a crystalline state when receiving light having a predetermined intensity or less. The rotating body drive device according to any one of claims 1 to 3,
The rotating body driving device according to claim 1, wherein the irradiation light from the recording device is light stronger than light for writing an electrostatic latent image on the electrostatic latent image carrier . An image forming apparatus comprising an electrostatic latent image carrier that is driven by the rotating body driving device according to any one of claims 1 to 4 .
An image forming apparatus, wherein the electrostatic latent image carrier is a drum-shaped photoconductor . In the image forming apparatus including a latent electrostatic image bearing member to be driven by the rotary member driving device according to any one of claims 1 to 4,
The image forming apparatus wherein the electrostatic latent image bearing member is a belt-shaped photosensitive member. In an image forming apparatus that forms a color image by rotating a plurality of electrostatic latent image carriers,
5. The image forming apparatus according to claim 1, wherein at least one drive control of the plurality of electrostatic latent image carriers is performed by the rotating body driving device according to claim 1 .

Images