JP2002159196A - Motor, driver, control method of motor, sheet carrier, imaging apparatus, post-processing unit, document carrier, document reader and imaging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which the characteristics of a brushless motor, i.e., high response, easy control, high speed, high efficiency, and the like, are combined with the characteristics of a stepping motor, i.e., accurate start/stop, and the like, and an imaging apparatus comprising that motor. SOLUTION: Rotor of a motor is rotary driven through a drive control section generating a feedback controlled drive control pulse and a drive control pulse not subjected to feedback control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, a driving device having a motor, an image forming apparatus having a motor, and peripheral devices of the image forming device.

[0002]

2. Description of the Related Art Various motors are used in an image forming apparatus for forming an image by an electrophotographic system and its peripheral devices. In particular, a brushless motor and a stepping motor are often used.

[0003] The brushless motor has forward and reverse rotation control and high-speed rotation, is easy to control such as speed control, and is excellent in efficiency. It is used as a drive source for the unit.

A stepping motor is often used in a digital image forming apparatus because the start / stop control can be accurately performed, and is used as a drive source of a reading scanning unit and a recording paper conveying unit. In a color image forming apparatus, a stepping motor is used as a motor for driving a photoconductor.

[0005]

With the progress of technology development in the field of image forming apparatuses such as high-speed, multi-functional, miniaturization, etc., it has become possible to efficiently perform high-speed operation and start / stop with accurate position control. There is a tendency that a driving source is required. Such performance is difficult to achieve with a conventional brushless motor or stepping motor. That is, although the brushless motor is excellent in controllability and high-speed performance, it is difficult to perform start-stop control with an accurate rise characteristic or an accurate fall characteristic. Although start / stop control can be performed, there is a problem that efficiency and high speed are poor.

[0006] The performance of the motor as described above is not limited to the image forming apparatus, but is required to improve the performance of all devices.

An object of the present invention is to provide excellent controllability and high speed,
Another object of the present invention is to provide a motor capable of accurate start / stop control, a driving device using the motor, an image forming apparatus, and peripheral devices of the image forming apparatus.

[0008]

The above-mentioned object of the present invention is achieved by the following inventions.

1. A rotor having a magnet, an excitation coil disposed opposite to the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, and a drive for supplying a drive pulse to the excitation coil A circuit, first drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, and a non-feedback controlled drive control pulse for controlling the drive circuit. A second drive control means for controlling the drive circuit;

[0010] 2. The motor according to claim 1, wherein the rotation detector comprises a magnetic detector.

3. The motor according to claim 1, wherein the rotation detector comprises a photodetector.

4. 2. The motor according to the above item 1, wherein the rotation detector comprises a resolver.

5. The motor according to any one of claims 1 to 4, wherein the position detector includes a magnetic detector.

6. The motor according to any one of claims 1 to 4, wherein the first drive control unit and the second drive control unit are configured by a common pulse generation circuit.

[0015] 7. A rotor having a magnet, an excitation coil disposed opposite to the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, and a drive for supplying a drive pulse to the excitation coil Circuit, first drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, the drive by a non-feedback controlled drive control pulse A drive device comprising: a second drive control unit that controls a circuit; and a system control unit that selects and operates the first drive control unit and the second drive control unit.

[0016] 8. 8. The driving device according to the item 7, wherein the rotation detector includes a magnetic detector.

9. 8. The driving device according to the item 7, wherein the rotation detector includes a photodetector.

10. 8. The driving device according to the item 7, wherein the rotation detector includes a resolver.

11. The drive device according to any one of Items 7 to 10, wherein the position detector includes a magnetic detector.

[12] The drive device according to any one of claims 7 to 11, wherein the system control unit activates the second drive control unit in start-up control, and activates the first drive control unit in steady-state control. .

13. The drive device according to any one of claims 7 to 12, wherein the system control unit activates the second drive control unit in stop control and activates the first drive control unit in steady control. .

14. 13. The drive device according to the item 12, wherein the activation control performs an external task.

[15] 14. The drive device according to the above 13, wherein the stop control performs an external task.

16. 13. The drive device according to claim 12, wherein the system control unit automatically calculates a rotation amount until reaching the target rotation speed based on the target rotation speed in the startup control.

17. The drive device according to claim 13, wherein the system control unit automatically calculates a rotation amount up to a stop based on a rotation speed in a steady operation in the stop control.

18. 17. The drive device according to claim 12 or 16, wherein the system control unit performs acceleration control for the rotor within a range in which a step response is possible in the start control.

19. The drive device according to 13 or 17, wherein the system control unit performs deceleration control on the rotor within a range where a step response is possible in the stop control.

20. 20. The drive device according to any one of 7 to 19, wherein the first drive control unit and the second drive control unit are configured by a common pulse generation circuit.

21. A first drive mode in which the excitation coil is driven based on a drive control pulse that is feedback-controlled using a detection signal of the rotation speed and the position of the rotor, and the excitation coil is driven based on a drive control pulse that is not feedback-controlled. A method for controlling a motor, wherein the rotor is rotationally driven by selecting and using a second drive mode.

22. 22. The motor control method according to 21 above, wherein the motor is caused to perform work to the outside in each of the first drive mode and the second drive mode.

23. In the start control, the motor is operated in the second drive mode, and in the steady control,
23. The motor control method according to the above item 21 or 22, wherein the motor is operated in the first drive mode.

24. 24. The motor according to any one of 21 to 23, wherein in the stop control, the motor is operated in the second drive mode, and in the steady control, the motor is operated in the first drive mode. Control method.

25. In the start control, a rotation amount until reaching the target rotation speed is automatically calculated based on the target rotation speed, and the start control is performed based on the drive control pulse set by the calculation. 24. The method for controlling a motor according to 23 above.

26. In the stop control, the amount of rotation until the stop is automatically calculated based on the rotation speed in the steady operation, and the stop control is performed based on the drive control pulse set by the calculation. The control method of the motor described in the above.

27. 26. The motor control method according to 23 or 25, wherein, in the start control, acceleration control is performed on the rotor within a range where a step response is possible.

28. 27. The motor control method according to 24 or 26, wherein in the stop control, deceleration control is performed on the rotor within a range where a step response is possible.

29. 29. The motor control method according to any one of 21 to 28, wherein the second drive mode is used when the motor is operated at an extremely low speed.

30. In a sheet conveying apparatus having a conveying member for nipping and conveying a sheet, a motor for driving the conveying member, and a system control unit for controlling the motor, the motor is disposed to face a rotor having a magnet and the rotor. An excitation coil, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor,
A drive circuit that supplies a drive pulse to the excitation coil, a first drive control unit that controls the drive circuit with a drive control pulse that is feedback-controlled using the output of the rotation detector and the output of the position detector, Second drive control means for controlling the drive circuit by a drive control pulse subjected to non-feedback control, wherein the system control unit operates the first drive control means in controlling the transport member during steady transport. The sheet conveying apparatus is characterized in that, in at least one of the start-up conveyance and the conveyance stop of the conveyance member, control for operating the second drive control unit is performed.

31. It has a sheet sensor to detect the leading edge or the trailing edge of the conveyed sheet, the system control unit,
31. The sheet conveying apparatus according to the above 30, wherein the control at the time of the stop conveyance is started based on a detection signal of the sheet sensor.

32. In a sheet conveying apparatus having a conveying member for nipping and conveying a sheet, a motor for driving the conveying member, and a system control unit for controlling the motor, the motor is disposed to face a rotor having a magnet and the rotor. Excitation coil, a rotation detector that detects the rotation speed of the rotor, a position detector that detects the position of the rotor, a drive circuit that supplies a drive pulse to the excitation coil,
First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, and the drive circuit by a non-feedback controlled drive control pulse The system control unit activates the first drive control unit in the control at the time of steady transport of the transport member, and controls the first drive control unit at the time of reverse transport of the transport member. Is
A sheet conveying device for performing control for operating the second drive control means.

33. It has a sheet sensor to detect the leading edge or the trailing edge of the conveyed sheet, the system control unit,
33. The sheet conveying apparatus according to the above item 32, wherein the control at the time of the reverse conveyance is started based on a detection signal of the sheet sensor.

34. An image forming unit that forms a toner image on an image carrier, a paper feeding unit that supplies recording paper to the image forming unit, and a toner image formed in the image forming unit on a recording paper supplied from the paper feeding unit. An image forming apparatus having a transfer unit for transferring and a system control unit, wherein the paper supply unit includes a conveyance member for temporarily stopping conveyance during the conveyance and a motor for driving the conveyance member; A rotor having an exciting coil disposed opposite to the rotor, a rotation detector for detecting a rotation speed of the rotor,
A position detector that detects the position of the rotor, a drive circuit that supplies a drive pulse to the excitation coil, and the drive by a drive control pulse that is feedback-controlled using the output of the rotation detector and the output of the position detector. A first drive control unit that controls a circuit, and a second drive control unit that controls the drive circuit with a non-feedback controlled drive control pulse. In the control, the first drive control means is operated, and at least one of the stop control when temporarily stopping the transport member and the start control after the stop is performed, the control for operating the second drive control means is performed. An image forming apparatus comprising:

35. A recording paper sensor for detecting a leading edge of the recording paper being conveyed, wherein the system control unit starts the control for temporarily stopping the recording paper based on a detection signal of the recording paper sensor. The image forming apparatus as described in the above.

36. 36. The image forming apparatus according to 34 or 35, wherein the system control unit performs the start control after the temporary stop based on a signal generated in the image forming unit.

37. An image forming unit that forms a toner image on an image carrier, a paper feeding unit that supplies recording paper to the image forming unit, and a toner image formed in the image forming unit on a recording paper supplied from the paper feeding unit. A transfer section for transferring, a reverse transport member for reversing the front and back of the recording paper by reversing the transport direction of the recording paper, and a motor for driving the reverse transport member,
In a double-sided paper feeding unit for re-feeding a recording paper having a toner image formed on one side to the image forming unit and a system control unit, the motor includes a rotor having a magnet, An excitation coil disposed to face the rotor, a rotation detector for detecting the rotation speed of the rotor, a position detector for detecting the position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, and the rotation detector First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the position detector and the output of the position detector, and a second drive control means for controlling the drive circuit by a non-feedback controlled drive control pulse. 2 drive control means, wherein the system control unit operates the first drive control means in the control of the reverse transport member at the time of steady transport, and controls the transport member at the time of reverse transport. In your, image forming apparatus and performs control for operating the second drive control means.

38. A recording paper sensor for detecting a leading edge of the recording paper being conveyed, wherein the system control unit starts the control for temporarily stopping the recording paper based on a detection signal of the recording paper sensor. The image forming apparatus as described in the above.

39. In an image forming apparatus having an image carrier, an image forming unit that forms a toner image on the image carrier, a motor that drives the image carrier, and a system control unit,
The motor includes a rotor having a magnet, an excitation coil disposed to face the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, and a drive pulse applied to the excitation coil. A driving circuit,
First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, and the drive circuit by a non-feedback controlled drive control pulse The system control unit operates the first drive control unit in the drive control of the image carrier at a steady speed, and controls the activation of the image carrier and the second drive control unit. An image forming apparatus according to claim 1, wherein at least one of the stop controls performs control for operating the second drive control unit.

40. The image forming apparatus according to the above item 39, further comprising a plurality of the image carriers, a plurality of the image forming units, and a plurality of the motors.

41. Stacking means for stacking a plurality of recording sheets, binding means for binding the recording sheets on the stacking means, a conveying member for conveying the recording paper to the stacking means, a motor for driving the conveying member, and a binding having a system control unit In the apparatus, the motor includes a rotor having a magnet, an excitation coil disposed to face the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, and the excitation coil. A first drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using an output of the rotation detector and an output of the position detector, and a non-feedback control Second drive control means for controlling the drive circuit in accordance with the drive control pulse provided, and wherein the system control unit is configured to control the drive member while holding the front end of the recording paper. In the control for temporarily stopping the transport member to supply the recording paper to the stacking unit by activating the transport member after the stop, the control for operating the second drive control unit is performed. And a post-processing device.

42. A recording paper sensor for detecting a leading end of the recording paper being conveyed, wherein the system control unit starts the control for temporarily stopping based on a detection signal of the recording paper sensor. Post-processing device as described.

43. An image forming system comprising: an image forming apparatus for forming an image on a recording sheet; and the post-processing apparatus described in 41 or 42 above.

44. In an image transport apparatus that transports a document to a reading position, reverses the front and back, and transports the document again to the reading position, a reverse transport member that reverses and transports the document, a rotor that drives the reverse transport member and has a magnet, An excitation coil arranged to face the motor, a rotation detector for detecting the rotation speed of the rotor, a position detector for detecting the position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, First drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using an output and the output of the position detector, and second drive control means for controlling the drive circuit with a non-feedback controlled drive control pulse A motor having drive control means, and a system control unit, wherein the system control unit performs the first drive control in controlling the reverse transport member during steady transport. Actuating the stage, in the control at the time of reversing said reversing transport member, document feeder and performs control for operating the second drive control means.

45. 45. The document according to 44, further comprising a document sensor for detecting a leading edge of the document to be conveyed, wherein the system control unit starts control during the reverse conveyance based on a detection signal of the document sensor. Transport device.

46. In a transport member that transports a document to be transported and then supplies the document to a reading position after transporting the document, a motor that drives the transport member, and an image transport device that includes a system control unit, the motor includes a rotor having a magnet. An excitation coil disposed to face the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using an output of a detector and an output of the position detector;
A second drive control unit for controlling the drive circuit by a drive control pulse subjected to non-feedback control, and the system control unit operates the first drive control unit in a control at the time of steady transport of the transport member. And a control for activating the second drive control means in the activation control of the conveyance member.

47. 47. The document feeding device according to claim 46, further comprising a document sensor for detecting a leading edge of a document to be conveyed, wherein the system control unit starts the activation control based on a detection signal of the document sensor.

48. 48. A document reading device, comprising: the document feeding device according to any one of 44 to 47; and an image reading unit that reads an image of a document transferred at a reading position.

49. 49. An image forming system comprising: the document reading device according to 48; and an image forming unit that forms an image based on image information generated by the document reading device.

[0058]

FIG. 1 is a diagram showing a configuration of a driving device having a motor M according to an embodiment of the present invention.

M1 is a rotor having a magnet, and M2 is an exciting coil of a stator. M3 is a driver that outputs a drive power pulse based on the drive control pulse NFP or FP. M4 is a position detector that detects the rotor M1, and is a magnetic detector such as a Hall element or a Hall IC.
The position detector M4 detects the angular position of the rotor M1. M
Reference numeral 5 denotes a rotation detector that detects the rotation speed of the rotor M1, and is configured by an encoder such as an optical encoder or a magnetic encoder or a resolver. M6 is a drive control unit.
It comprises a drive control means M6a and a second drive control means M6b. In an actual circuit, the first drive control means M6a and the second drive control means M6b are composed of a common pulse generation circuit, and each operates according to a different control program. The first drive control means M6a performs feedback control using the feedback-controlled drive control pulse, ie, the output of the position detector M4 and the output of the rotation detector M5, and has a constant frequency having a pulse width corresponding to these outputs. Output the drive control pulse FP of
The second drive control means M6b outputs a drive control pulse subjected to non-feedback control, that is, a drive control pulse NFP having a pattern according to a program. As described above, the motor M according to the embodiment of the present invention has the drive control pulse F
It has both a function as a brushless motor operated by P and a function as a stepping motor operated by a drive control pulse NFP subjected to non-feedback control.

The system controller M7 controls the drive controller M6 to select and use the brushless motor function and the stepping motor function of the motor M.

FIG. 2 is a time chart showing an example of control by the system control unit M7. The system control unit M7 performs the following control in the start control for starting the motor M, the steady control for operating the motor M in a steady state, and the stop control for stopping the motor M.

In the start control from t1 to t2, the system control unit M7 is controlled by the second drive control means M of the drive control unit M6.
By operating the motor 6b, the rotation speed of the motor M as the stepping motor is increased from 0 to the steady rotation speed V.
In the steady control from t2 to t3, the system control unit M7 operates the first drive control unit M6a to maintain the rotation speed of the motor M as a brushless motor at V. In the stop control from t3 to t4, the system control unit M7 operates the second drive control unit M6b to perform control to lower the motor M as a stepping motor from the rotation speed V to 0. Thus, the motor M is at t1
It operates as a stepping motor in the start control from t2 to t2 and in the stop control in t3 to t4, and operates as a brushless motor in the steady control t2 to t3. By such control, high position accuracy at the time of starting / stopping, and high-speed rotation and high efficiency with accurate speed control at the time of steady operation are ensured.

Incidentally, if necessary, the second drive control means M6
b is used only in the start control, the first drive control means M6a is used in the steady control and the stop control, or the second drive control means M6b is used only in the stop control, and the first drive control means M6a is used in the start control and the steady control. Can also be used.

In the start control from t1 to t2, in order to accurately reach the target speed, the number of pulses for causing the motor M to reach the target speed, in other words, the rotation amount of the motor M or the motor M is driven. It is desirable to automatically calculate and set the moving distance of the driven member such as the photoconductor using the target speed. Such calculations are performed in real time in the control routine by the system control unit M7.

The same control is performed in the stop control from t3 to t4. That is, the rotation speed in the steady operation (FIG. 2)
, The number of pulses to stop at the desired position, in other words, the moving distance of the driven member is calculated and set.

T1 to t, which are controls involving acceleration or deceleration
In the start control of Step 2 or the stop control of t3 to t4, the rotor M1 is controlled to prevent the stepping motor from stepping out.
It is necessary to supply the driving power to the exciting coil M2 within a range where the step response is possible. If the straight lines Q1 and Q2 in FIG. 2 indicate the limit of the range in which the step response of the rotor M1 is possible, the gradient of the speed change line q1 at the time of the start control and the gradient of the speed change line q2 at the time of the stop control will Set each one more loosely.

FIG. 3 shows a time chart in an example of the reversal control of the motor M. The system control unit M7 operates the first drive control unit M6a in the regular control of the motor M in the forward rotation of the speed V1. In the stop control of the motor M from t5 to t6, the second drive control means M6b is operated to decelerate and stop the motor M. Further, the second drive control means M6b is operated until t7, and at the time t7 when the speed reaches -V2, the first drive control means M6a is operated to rotate the motor M negatively at the steady speed -V2.

FIG. 4 shows another example of the reversal control of the motor M. In the steady control and the stop control of the positive rotation, the first drive control means M6a is operated, and the second rotation control is performed only when the negative rotation of the motor M is started. An example in which the drive control means M6b is operated is shown.
FIG. 5 shows still another example of the inversion control of the motor M. In the normal rotation regular control, after the first drive control means M6a is operated, the second drive control means M6b is operated in the stop control.
Is operated, and in the negative rotation control, an example is shown in which the first drive control means M6a is used from the start control to the steady control.

In addition to the start / stop control, when the motor M is driven to rotate at a very low speed of, for example, 300 rpm or less,
It is preferable to operate the second drive control means M6b to rotate the motor M. This makes it possible to reliably perform ultra-low-speed rotation, which is difficult to rotate depending on the brushless motor function, by using the stepping function.

FIG. 6 shows an image forming system according to an embodiment of the present invention, that is, an image forming system including an image forming apparatus, a document feeder, and a post-processing apparatus according to an embodiment of the present invention.

The image forming apparatus A carries out recording paper as a sheet from the recording paper storage means, feeds the recording paper to the image forming section, forms an image, and discharges the image. The document conveying device DF conveys a document as a sheet to a reading position, and discharges the document that has passed the reading position to a discharge tray. The post-processing device FS receives a recording sheet as a sheet from the main body of the image forming apparatus, conveys and processes the recording sheet, and discharges the sheet to a discharge tray. Thus, the image forming apparatus A,
The document transport device DF and the post-processing device FS are examples of a sheet transport device that transports a sheet.

The document feeder DF is integrally foldable. When the document feeder DF is raised and the platen glass 22 is opened, a document can be directly placed on the platen glass 22. It is configured to be able to. The present embodiment has a reading mode for reading an image of a document while the document is being conveyed by the document feeding device DF, and a reading mode for reading an image of a document in which the document is placed on the platen glass 22.

The image reading section 2 reads an image of a document,
A means for obtaining image data, a slit 21 which is a slit-shaped opening for reading an image of a document being conveyed by the document conveying device DF, and a platen which is a document table for placing (statically) the document. The glass 22, a lamp 231 as a light source for irradiating the original with light, and a first mirror unit 23 integrating a first mirror 232 for reflecting light reflected from the original, and a second mirror for reflecting light from the first mirror 232. A V mirror unit 24 in which a mirror 241 and a third mirror 242 are integrated, and a reflected light from a document on the slit 21 or on the platen glass 22 are transmitted to a CCD 26 described later.
Lens 25, which is an image forming means for forming an image, and a linear CCD 26, which is an image reading means for photoelectrically converting a light image formed by the image forming lens 25 to obtain image information.
have.

When the image reading unit 2 reads the document sent by the document feeder DF, the first mirror unit 23 and the V mirror unit 24 are positioned below the slit 21 as shown in FIG. ing. The lamp 231 irradiates the document conveyed on the slit 21 by the document conveying device DF with light, and the light reflected from the document is reflected by the first mirror 232, the second mirror 241, the third mirror 242, and the imaging lens. The light is incident on the CCD 26 via the light source 25. The CCD 26 photoelectrically converts the incident light to read the image of the document in the main scanning direction (the direction perpendicular to the paper surface in FIG. 1). On the other hand, since the document is moved in the sub-scanning direction by the document conveying device DF, the The entire image can be read. Image data obtained by reading by the CCD 26 is appropriately subjected to image processing, and is converted into an image by writing by a laser writing system 33 described later.

When reading a document placed on the platen glass 22, the first mirror unit 23 and the V mirror unit 24 are moved along the platen glass 22.
In FIG. 1, the image on the document can be read while moving to the right. Thus, the document feeder DF and the image reading unit 2 constitute a document reading device.

The image forming section 3 is a means for forming an image on the recording paper P conveyed at a predetermined process speed based on the image data obtained by the image reading section 2. The image forming section 3 according to the present embodiment forms an image using an electrophotographic process. Image forming unit 3
A latent image is formed by exposing the photosensitive drum 31 on the basis of a photosensitive drum 31 as an image carrier, a charger 32 for uniformly charging the photosensitive drum 31, and image data read by the CCD 26. Laser writing system 3 as exposure means
3. a developing device 34 for developing a latent image on the photosensitive drum 31 to form a toner image; a transferring device 35 for transferring the toner image carried on the photosensitive drum 31 to recording paper P; A separator 36 that separates the transferred recording paper P from the photosensitive drum 31; a cleaning unit 37 that removes toner remaining on the photosensitive drum 31 after transfer;
A fixing unit 38 for fixing the upper toner image is provided. As shown in the figure, a charger 3 is provided around the photosensitive drum 31.
2, a laser writing system 33, a developing unit 34, a transfer unit 35, a separator 36, and a cleaning unit 37 are arranged.

The photosensitive drum 31 is provided with a motor M shown in FIG.
Driven by Therefore, the photosensitive drum 31 is driven by the motor M as a stepping motor at the time of starting and stopping, and is driven by the motor M as a brushless motor at the time of steady rotation for performing image formation. And high-speed rotation.

The laser beam is rotated in the direction of the arrow by the driving of the motor M, and is uniformly charged by the charger 32, and the exposure is started in synchronization with the leading end of the recording paper P sent from the registration roller 56 described later. Latent image formation by the insertion system 33,
Development is performed by the developing device 34, and a toner image is formed based on image data obtained by reading by the CCD 26. The formed toner image is transferred by the transfer device 35.
The image is transferred onto the recording paper P. The recording paper P on which the toner image has been transferred is separated from the surface of the photosensitive drum 31 by the separator 36, and is conveyed to the fixing means 38, where the toner image is fixed on the recording paper P by the action of heating and pressing. You. on the other hand,
The photosensitive drum 31 on which the toner image has been transferred to the recording paper P is
The rotation is further continued, and the toner remaining on the photosensitive drum 31 is removed by the cleaning unit 37, and the cleaning unit 37 is used for the next image formation.

In this embodiment, the photosensitive drum 3
In the vicinity of the photosensitive drum 31 between the first roller 1 and the registration roller 56, a drum front conveyance roller 39 for conveying the recording paper P sent from the registration roller 56 is provided, which contributes to an increase in the conveyance force of the recording paper P. ing. Separator 3
In order to transport the recording paper P separated by the separator 36, the lower surface side of the recording paper P (opposite to the image-formed side) is supported and transported between the fixing paper 38 and the fixing means 38. A transport roller (unsigned) and a belt (unsigned) are provided.

In the present embodiment, a plurality of recording paper storage units 4, that is, 4 A, 4 B, and 4 C are arranged below the image forming unit 3 in multiple stages.

The paper feed section 5 is a transport means for transporting the recording paper P from the recording paper storage means 4 to the image reading section 3, and converts the recording paper P stored in each of the recording paper storage means 4A to 4C into an image. It is configured so that it can be transported to the reading unit 3.

The paper discharging / re-feeding means 6 is for discharging or re-feeding the recording paper P formed by the image reading unit 3 on the recording paper P conveyed by the paper feeding unit 5. Means. The paper discharging / re-feeding means 6 is a fixing discharge roller 6 for discharging the recording paper P on which the toner image is fixed from the fixing means 38.
1. Switching means for switching the transport path between the case where the recording paper P discharged by the fixing discharge roller 61 is directly discharged outside the apparatus and the case where the recording paper P is reversed and then discharged or re-fed for forming an image on the back surface. 62, a paper discharge roller 63 for discharging the recording paper P out of the apparatus, a reversal conveyance roller 65 as a reversal conveyance member for reversing and conveying the recording paper P branched and conveyed from the switching means 62 by forward and reverse rotations, and a reversal conveyance. A re-feed unit 66 is provided for re-feeding the recording sheet P inverted by the rollers 65 to the image reading unit 3.

When the recording paper P on which the image has been formed is to be discharged as it is, that is, with the image-formed surface facing upward, the recording paper P is guided into the post-processing apparatus FS by the switching means 62. When the recording paper P on which an image is formed is turned upside down and discharged, that is, when the recording paper P is discharged with the surface on which the image is formed facing down, the recording paper P is guided by the switching unit 62 and conveyed by the fixing discharge roller 61. The recording paper P is once conveyed in the direction of the reverse conveyance roller 65, and the recording paper P is
2, the conveyance direction is reversed, and the discharge rollers 6
3 to discharge outside the machine. On the other hand, when an image is formed on the back surface of the recording paper P, the recording paper P guided by the switching unit 62 is conveyed by the fixing discharge roller 61 in the direction of the reverse conveyance roller 65, By performing switchback, the sheet is turned upside down and conveyed to the sheet re-feeding unit 66. The recording paper P conveyed to the paper re-feeding unit 66 joins the conveyance path of the paper feeding unit 5 between a loop forming roller 55 described later and an intermediate conveyance roller 541 described later, and is supplied from the recording paper storage unit 4. Like the paper, the paper is conveyed to the image reading unit 3.

A reverse transport roller 65 as a reverse transport member
The motor M shown in FIG. 1 is used as a driving means of the reverse transport roller 65 in order to ensure the accuracy of the reverse transport operation. The reversing conveyance roller 65 conveys the recording paper P in the forward direction, that is, the right direction in FIG. 6, and based on the detection of the rear end of the recording paper P by the recording paper sensor S2, the time t5 in FIGS. The stop control starting from is started. The rotation direction of the reverse conveyance roller 65 is reversed, and the time t7
Then, the flow shifts to the reverse rotation direction, that is, the steady conveyance of the recording paper P in the left direction in FIG. By using the first drive control means M6a and the second drive control means M6b in any one of the modes shown in FIGS. 3 to 5, the recording paper P can be conveyed at high speed and can be accurately reversed and conveyed.

Next, the conveyance path of the recording paper P by the paper supply unit 5 will be described. As shown in FIG. 7, the recording paper P stored in each of the recording paper storage units 4A to 4C is separated from the individual transport paths a for sending the recording paper P from the recording paper storage units 4A to 4C.
A vertical transport path b for transporting the recording paper P sent out via the individual transport path a; and a recording paper P transported via the vertical transport path b.
Is transported along a transport path having a resist transport path c for transporting the image to the image reading unit 3. The individual transport path a is connected to the pre-registration rollers 53 by the recording paper storage units 4A, AB,
A transport path leading to A, 53B, and 53C is provided for each of the recording paper storage units 4A to 4C. The vertical transport path b is a transport path from the intermediate transport roller 543 to the loop forming roller 55, and is a transport path through which the recording paper P transported from the recording paper storage units 4B and 4C passes in common. The recording paper P is conveyed from the pre-registration roller 53A to the loop forming roller 55 via the intermediate conveyance roller 541 without passing through the intermediate conveyance roller 542 from the recording paper storage means 4A.

The vertical transport path b is a transport path that is partially used in common. The vertical transport path b partially includes the recording paper P from the recording paper storage means 4C and the recording paper P from the recording paper storage means 4B. Is a common transport path d through which the recording paper P from the recording paper storage means 4C and the recording paper P from the recording paper storage means 4B are commonly transported. 542 and the recording paper P from the recording paper storage means 4C, the recording paper P from the recording paper storage means 4B, and the recording paper storage means 4A.
Transport roller 541 for commonly transporting recording paper P from
Is provided.

Next, each configuration of the sheet feeding section 5 will be described. In the following description, the same pickup roller, separation conveyance roller, separation retard roller, separation means, pre-registration roller, and loop formation guide are provided in the recording paper storage means 4A, 4B, and 4C, respectively. Since the functions are also common, the description will be given without adding A, B and C symbols unless necessary.

The paper feed unit 5 includes a pickup roller 51,
In order to separate the recording paper P sent out by the pickup roller 51 one by one, separation means 52 (first separation roller 52) including a separation conveyance roller 521 and a separation retard roller 522.
A pre-registration roller 53 which is a first abutting means for restarting the conveyance after the recording paper P separated by the separating means 52 is once abutted;
A plurality of intermediate transport rollers 541 serving as intermediate transport means for transporting the recording paper P transported by the pre-registration rollers 53
To 543, the recording paper P conveyed by the intermediate conveyance roller
Forming roller 55 as the second loop forming means for conveying the recording paper P, and the recording paper P conveyed by the loop forming roller 55
Has a registration roller 56 serving as a second abutting means for restarting the conveyance after being once abutted, and a plurality of motors (not shown) serving as a driving means for driving each roller. The pickup roller 51 and the separation means 52 are provided in each of the recording paper storage means 4A, 4B, and 4C, and separate and feed out one by one from the stacked recording paper P in the recording paper storage means.

The pickup roller 51 is provided so as to be able to move up and down by driving means such as a solenoid (not shown) in FIG. 7. When the pickup roller 51 is moved to the lower position, it is located on the individual transport path a, and Of the plurality of recording papers P stored in the storage means 4, the uppermost recording paper P comes into contact with the uppermost recording paper P, and is driven and rotated by a driving means (not shown) to rotate.
It is possible to send out. When the pickup roller 51 is moving to the upper position, the pickup roller 51 is at a position separated from the recording paper P. The recording paper storage means 4 is pushed up by means such as a bottom plate (not shown) so that the upper positions of the plurality of stored recording papers P are always at the same position.

The separation means 52 includes a pickup roller 51
In this embodiment, the recording paper P is separated by one and has a separation conveyance roller 521 and a separation retard roller 522. The separation conveyance roller 521 is a roller that comes into contact with the upper surface of the recording paper P to be conveyed and is rotated by a driving unit (not shown) in a direction indicated by an arrow. And a roller for transporting the recording paper P. The judgment retard roller 522 is a stop roller in which a torque limiter is incorporated, and the judgment conveyance roller 5
These rollers separate the recording paper P sent by the pickup roller 51 into sheets one by one in cooperation with the recording paper P.

The pre-registration roller 53 is provided with
Is a first abutting means for once abutting the separated recording paper P and restarting the conveyance, and is constituted by a pair of opposed rollers, and is rotatable in a direction indicated by an arrow by driving means (not shown). It is provided on the individual transport path a. The pre-registration roller 53 stops rotating when the recording paper P is conveyed by the separating means 52. Therefore, the conveyed recording paper P once hits the pre-registration roller 53 and its leading end Is stopped. After that, the rotation of the pre-registration roller 53 is started, and the recording paper P is conveyed again by the pre-registration roller 53. In this way, by once abutting the recording paper P against the pre-registration roller 53, the timing of the leading end of the recording paper P can be accurately obtained, and the variation in conveyance can be suppressed.

In this embodiment, the pre-registration roller 5
3, even after the leading end of the recording paper P has hit the recording paper P.
2 so that the conveyance of the recording paper P is continued, whereby the recording paper P whose leading end is stopped is configured.
Can be formed to correct the skew of the paper.

The intermediate conveyance rollers 541 to 543 are intermediate conveyance means for conveying the recording paper P conveyed by the pre-registration rollers 53. The intermediate conveyance roller 541 is a recording paper P conveyed by the pre-registration rollers 53A to 53C.
, That is, the first recording paper storage means 4A to the third
These rollers transport the recording paper P from the recording paper storage unit 4C. The intermediate transport roller 542 is a pre-registration roller 5
The rollers transport the recording paper P transported by 3B and 53C, that is, transport the recording paper P from the second recording paper storage unit 4B and the third recording paper storage unit 4C. The intermediate transport roller 543 is a roller that transports the recording paper P transported by the pre-registration roller 53C, that is, transports the recording paper P from the third recording paper storage unit 4C. The loop forming roller 55 is a unit that conveys the recording paper P conveyed by the intermediate conveyance roller 541.

Intermediate transport roller 542 as a transport member
Has a function of starting up and transporting the recording paper P transported from the recording paper storage means 4B or 4C temporarily, after taking a paper feed timing. In order to perform such temporary stop and start at an accurate timing, the intermediate transport roller 54 is used.
2 is driven by the motor M shown in FIG. In particular, in order to stop the leading end of the recording paper P at an accurate position, it is desirable to perform the non-feedback controlled drive control pulse in the temporary stop control.

The stop control by the first drive control means M6a is started at t3 in FIG. 2 by the recording paper leading end detection signal of the recording paper sensor S1 for detecting the recording paper P, and the intermediate conveyance roller 542 is stopped at t4.

The registration roller 56 is a second abutting means for once abutting the recording paper P conveyed by the loop forming roller 55 and restarting the conveyance, and is a conveying member for conveying the recording paper P after stopping. is there. Registration roller 56
When the recording paper P is conveyed by the loop forming roller 55, the rotation of the recording paper P is stopped. Therefore, the conveyed recording paper P once strikes the registration roller 56, and its leading end is stopped. . Thereafter, the rotation of the registration rollers 56 is started, and the recording paper P is conveyed again by the registration rollers 56. And
Synchronizing with the recording paper P sent from the registration roller 56, the latent image formation by the laser writing system 33 is started,
The recording paper P and the toner image on the photosensitive drum 31 are synchronized. In this way, by once abutting the recording paper P against the registration roller 56, the timing of the leading end of the recording paper P can be accurately obtained, the variation in conveyance can be suppressed, and the synchronization of the laser writing system 33 can be achieved. , And an image can be formed at an accurate position on the recording paper P.

The registration roller 56 is a motor M shown in FIG.
Driven by By using the drive device of FIG. 1, high-speed recording paper conveyance and accurate start-up are realized. By operating the second driving means 6a in FIG. 1 on the basis of the synchronization signal generated in the image forming section 3, the synchronization with the image formation on the photosensitive drum 31 is accurately performed, and high-quality images without transfer deviation are obtained. Image formation becomes possible.

FIG. 8 is a diagram illustrating a document feeder D according to the embodiment.
It is sectional drawing of F. The paper feed tray D3 is provided with a side plate D3A for regulating a side edge of the document G and a rear end regulating member D3B for regulating a rear end of the document G. Although only one side plate D3A is shown in the figure, the side plate D3A is provided on both sides of the paper feed tray D3 and is movable in the document width direction. The width of the document G is regulated by this moving position.

Further, the uppermost original G on the paper feed tray D3
A pickup roller D4 for feeding paper is provided. A pressing plate D5 for pressing the document G is provided so as to face the pickup roller D4, and the leading end of the document G is configured to surely contact the pickup roller D4.

The separation roller D6 is transported so that only one sheet of the document G fed by the pickup roller D4 is surely conveyed.
And a separating retard roller D7 are provided to face each other.

One original G conveyed by the separation roller D6
Rollers D8 and D9 for temporarily stopping the sheet feeding and timing of sheet feeding, a guide path D10 is formed downstream of the register rollers D8 and D9, and a pair of rollers for conveying the document G to the reading position R are provided. Transport rollers D11, D
12, the document G conveyed to the reading position R is conveyed while being sandwiched between a platen roller D13 and a sheet guide plate D14 (slit glass) made of a transparent material.

The registration rollers D8 and D9 are driven by the motor M shown in FIG. The registration rollers D8 and D9 temporarily stop the original G conveyed by the separation roller D6 and convey the original G after forming a loop of the original G. In the start control of starting the original conveyance after the loop is formed,
Driven by a motor M as a stepping motor,
After the shift to the steady conveyance, the motor is driven by a motor M as a brushless motor. By the start control and the steady conveyance, the conveyance of the document G and the high-speed conveyance at accurate timing become possible.

The original G passing through the reading position R is transferred to the guide path D
A switching guide member for guiding by the transport rollers D20 and D21 and guiding the sheet to the paper discharge guide path D22 or the reverse guide path D23 for transporting again to the guide path D10. D24 is provided.

The document G guided to the paper discharge guide path D22 is provided to be discharged to a paper discharge section D31 by paper discharge rollers D29 and D30.

In the one-sided reading, the original G that has passed the reading position R and has been read on one side is discharged by the discharge rollers D29,
D30, and the discharge unit 3
1 is discharged.

In the case of double-sided reading, as described above, the one-sided document G is conveyed to the reading position R by the conveying roller D11 and read by the image reading section 2, and then the switching guide member D24 is switched to the guide path D23. The original G is transported, and the reversing roller D2
6. In D27, the sheet is conveyed to the reverse guide section D23A. Next, after holding the rear end of the document G, the reversing rollers D26 and D27 are rotated in the reverse direction to convey the document G from the rear end to the reversing guide path D23 again, and the switching guide member D28 is switched to the reversing guide path D23 side. Then, the original G is again conveyed to the guide path D10, whereby the original G is inverted and the conveying rollers D11, D12
Is carried to the reading position R and the back side is read.

The original G that has passed the reading position R is transported by the transport rollers D20 and D21 and is guided by the discharge guide path 23.
From the reverse rollers D26 and D27.
It is transported to the guide passage D10 three times. After the document G further passes through the reading position R, the document G is conveyed by discharge rollers D29 and D30 and discharged to a discharge unit D31.

The reversing rollers D26 and D27 reverse the rotation direction when the rear end of the document G reaches these rollers, and change the transport direction. In this embodiment, the reversing rollers D26 and D27 are driven by the motor M shown in FIG. It is desirable that the stop control at the time of reversal and the start control following the stop control be performed by a non-feedback controlled drive control pulse. Inversion control is started by a signal that the rear end of the recording paper has passed the document sensor S3. The first in FIG.
The second drive control means M6a and M6b operate in one of the modes shown in FIGS.

FIG. 9 is a diagram showing a post-processing device FS according to an embodiment of the present invention. The post-processing apparatus FS includes, from the top in the figure, a fixed sheet discharge tray F91, a cover sheet feeding unit F40 on which the sheet K is placed, a shift processing transport unit F20, a binding unit including an intermediate stacker F30 and a stapler F50, a folding unit F60. Are arranged in tandem in a substantially vertical direction.

At the upper right of the post-processing apparatus FS in the figure, an entrance transport section F10 is disposed. Further, on the left side in the figure of the post-processing device FS, a fixed paper tray F92 for stacking sheets that have undergone edge binding and shift processing, and a processed sheet S that has been folded in three or two are stacked. A paper output tray F93 is provided.

The position and height of the post-processing device FS are adjusted so that the receiving portion F11 of the recording sheet P carried out from the image forming apparatus A matches the sheet discharging section of the image forming apparatus A.

A transport roller F12 is provided in the receiving section F11, and a first transport path at the upper stage, a second transport path at the middle stage, a third transport path at the lower stage, and a fourth transport path at the lower stage are arranged downstream of the transport roller F12.

The conveyance of the recording paper P in the first to fourth conveyance paths will be described below. The first transport path is a paper discharge path for stacking and discharging the recording papers P on which images are formed in the paper discharge order. In the discharge mode using the first transport path, the switching unit G1 opens the first transport path and closes the path to the transport roller F18. The image-formed recording paper P discharged from the image forming apparatus A is introduced into the receiving unit F11, and is conveyed by the conveying roller F12. The recording paper P is switched by the switching means G1.
, And enters the first transport path, where the transport rollers F1
The paper is conveyed at 4, F15, and F16 and discharged to the fixed paper discharge tray F91.

The second transport path is the recording paper P on which an image has been formed.
, For example, in the direction of the transport width (direction perpendicular to the transport direction, the same applies hereinafter) for each predetermined number of sheets, such as for each number of documents, and discharges the sheet to the elevating discharge tray F92. is there. In the mode using this transport path, the switching means G1 closes the first transport path and opens a path to the transport roller F18, and the switching means G2 opens the second transport path and closes the third transport path. The recording paper P transported by the transport roller F12 is transported to the first transport path, and transported to the shift processing unit F20 by the transport roller F22. Shift processing unit F
The transport roller F24 in the printer 20 has a shift transport function of receiving the leading edge of the recording paper P and displacing in the transport width direction to transport. The recording paper P that has passed through the shift processing unit F20 is discharged to a lifting discharge tray F92 by a discharge roller F26.

The third transport path is provided for every predetermined number of recording papers P.
For example, it is a transport path for performing a binding process for each number of documents.
In the mode using the transport path, the switching means G1 closes the first transport path and opens the path to the transport roller F18, and the switching means G2 closes the second transport path and opens the third transport path. The recording paper P is transported by rollers F18, F32, F3.
4 and sent to the intermediate stacker F30. When the trailing end of the recording paper P leaves the transport roller F34, the recording paper P slides down the intermediate stacker F30, hits the movable abutting member F51, and stops. Intermediate stacker F30
Reference numeral denotes a stacking unit for stacking the recording paper P, and a reversing unit for reversing the front and rear of the recording paper P in the transport direction.

The transport rollers F32 and F34 temporarily stop these sheets when the leading end of the recording paper P or the paper K arrives, and take the timing of the binding operation of the stapler F50.

In this embodiment, the motor M shown in FIG. 1 is used as a driving means for the transport rollers F32 and F34 as transport members. By performing the stop control for temporarily stopping the recording sheet P or the sheet K by the non-feedback drive control pulse, the stop position of the recording sheet P and the sheet K upstream of the intermediate stacker F30 is accurately controlled, and the high-speed binding is performed. Work becomes possible. The stop control of the transport rollers 32 and 34 is started based on a leading edge detection signal of the recording paper P or the paper K of the recording paper sensor S4.

F60 is a folding device that folds the recording paper P and the paper K in three or two. The folded recording paper P and the paper K are discharged to a fixed paper discharge tray F93.

In the image forming system described above, the photosensitive drum 31, the registration rollers 53, D8, D
9. A motor M is used as a driving means for the reversing conveyance roller 65, the intermediate conveyance roller 542, and the conveyance rollers F32 and F34, but the present invention employs at least one of these photosensitive drums and various rollers, or any one of them. An image forming apparatus using the motor shown in FIG. 1 as a driving unit of the driven member having the same function as the driven member, its peripheral devices, and a control method of the motor as such a driving unit are included.

Further, the embodiment of the present invention described above is a monochrome image forming apparatus, but the present invention can be applied to a color image forming apparatus. In particular, in a color image forming apparatus having a plurality of image carriers and forming a color image by synthesizing a toner image of each color formed on the plurality of image carriers on recording paper, By driving each of them by the motor shown in FIG. 1, it becomes possible to drive each image carrier at a high speed while accurately controlling its position, and to form a high-quality color image with a high-speed color image forming apparatus. Is realized.

[0121]

According to the first, second, third, fourth, fifth, or twenty-first aspect of the present invention,
According to the second aspect of the present invention, a motor having features of a brushless motor such as high-speed response and ease of control and features of a stepping motor such as high-precision start / stop control is realized.

According to the sixth or twentieth aspect of the present invention, a one-chip driving circuit forms a motor driving circuit having a function of a brushless motor and a function of a stepping motor.

According to the seventh, eighth, ninth, tenth, or eleventh aspects of the present invention, the characteristics of a brushless motor such as high-speed response and ease of control are combined with the characteristics of a stepping motor such as high-precision start / stop control. Since the motor having the motor is used, the two functions can be arbitrarily used depending on the performance required by the device using the motor.

According to the twelfth or twenty-third aspect of the present invention, a driving device having accurate starting characteristics, and at the same time, ensuring high-speed response and easy control in a steady operation is realized.

According to the thirteenth or twenty-fourth aspect of the present invention, a drive device having an accurate stop characteristic, and at the same time, ensuring high-speed response and easy control in a steady operation is realized.

According to the invention of claim 14, 16 or 25,
It becomes possible to set the operation amount at the time of startup controlled accurately.

According to the invention of claim 15, 17 or 26,
It becomes possible to set the amount of operation at the time of the stop controlled precisely.

According to the invention of claim 18, 19, 27 or 28, step-out during start control or stop control can be prevented.

According to the twenty-ninth aspect of the present invention, it is possible to operate a motor having a high-speed rotation performance at an extremely low speed.

According to the thirtieth aspect, it is possible to convey a sheet at a high speed and to set an accurate conveying distance.

According to the thirty-first aspect, the sheet can be accurately stopped at a desired position.

According to the thirty-second or thirty-third aspect of the present invention, it is possible to accurately perform reverse sheet conveyance.

According to the invention of claim 34, 35 or 36,
Since it is possible to accurately synchronize the feeding of the recording paper with the image formation, it is possible to form an image without image displacement or image bending.

According to the thirty-seventh and thirty-eighth aspects of the present invention, it is possible to form an image on a recording sheet at an accurate position when forming a back side image, and to prevent a recording sheet from being jammed in the back side image forming re-feed section. Transport failure is prevented.

According to the thirty-ninth aspect of the present invention, it is possible to prevent image blurring and reduction in resolution caused by fluctuations in the moving speed of the image carrier, thereby forming an image having high resolution and high sharpness. A high-speed image forming apparatus that can be realized is realized.

According to the fortieth aspect, a high quality and high speed color image forming apparatus is realized. According to the invention of claim 41 or 42, the timing of the binding step in the post-processing device and the timing of the process of transporting the recording paper to the post-processing device are accurately adjusted, so that the high-speed image forming apparatus can be applied to a high-speed image forming apparatus. A post-processing device is realized.

According to the forty-third aspect, a high-speed image forming system for forming an image at a high speed and performing a binding process is realized.

According to the invention of claim 44, 45, 46 or 47, a document feeder which can perform high-speed reading and has very few sheet feeding defects such as document jams is realized.

According to the forty-eighth aspect of the present invention, an original reading device capable of high-speed reading is realized. According to the invention of claim 49,
A two-sided image forming apparatus that reads an original at a high speed and forms an image is realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a driving device according to an embodiment of the present invention.

FIG. 2 is a time chart illustrating an example of control by a system control unit.

FIG. 3 is a time chart illustrating an example of control by a system control unit.

FIG. 4 is a time chart illustrating an example of control by a system control unit.

FIG. 5 is a time chart illustrating an example of control by a system control unit.

FIG. 6 is a diagram showing an image forming system according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a sheet feeding unit of the image forming apparatus according to the embodiment of the present invention.

FIG. 8 is a view showing a document feeder according to the embodiment of the present invention.

FIG. 9 is a diagram showing a post-processing device according to an embodiment of the present invention.

[Explanation of symbols]

 M Motor M1 Rotor M2 Excitation coil M3 Driver M4 Position detector M5 Rotation detector M6 Drive control unit M6a First drive control unit M6b Second drive control unit M7 System control unit 31 Photoconductor drum 65 Reverse transport roller 56, D8, D9 Registration rollers 541, 542, 543 Intermediate transport rollers D26, D27 Reverse rollers F32, F34 Transport rollers

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B65H 85/00 G03G 15/00 106 3F049 G03G 15/00 106 107 3F100 107 510 3F102 510 H02P 8/00 303A 3F108 21/14 H04N 1/00 108Z 5C062 H02P 8/00 303 H02P 6/02 321K 5C072 8/14 G03G 21/00 372 5H560 H04N 1/04 H02P 8/00 304A 5H580 // H04N 1/00 108 H04N 1/12 A F-term (reference) 2C480 CA02 CA40 CA43 CA44 CB31 CB33 EA08 EA22 EA25 2H027 DA17 DA21 DB04 ED02 ED12 ED16 ED29 EE03 EE04 EE05 FA13 2H028 BA03 BA06 BA09 BB02 BB04 2H072 AA13 AB07 AB06 AB09 6 BA58 BA68 BA83 BB05 3F049 AA01 AA10 EA10 EA17 EA22 EA28 LA01 LB02 LB03 3F100 AA02 AA03 CA12 CA15 DA01 EA02 3F102 AA05 AB01 BA01 BB02 CA03 DA08 EA03 EC03 FA04 3F108 GA01 GB01 AC02 A01 AC02 A03 AC01 BA04 NA04 NA07 NA10 XA01 5H560 AA03 BB12 DA01 DB01 DB04 HA10 HB10 RR05 XA04 XA05 5H580 AA02 AA04 BB01 BB09 CA02 CA12 FD12

Claims (49)

[Claims] A rotor having a magnet; an excitation coil disposed to face the rotor; a rotation detector for detecting a rotation speed of the rotor; a position detector for detecting a position of the rotor; driven by the excitation coil A drive circuit for supplying a pulse, first drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, and non-feedback controlled A second drive control means for controlling the drive circuit by a drive control pulse. 2. The motor according to claim 1, wherein the rotation detector comprises a magnetic detector. 3. The motor according to claim 1, wherein said rotation detector comprises a photodetector. 4. The motor according to claim 1, wherein the rotation detector comprises a resolver. 5. The motor according to claim 1, wherein said position detector comprises a magnetic detector. 6. The motor according to claim 1, wherein said first drive control means and said second drive control means are constituted by a common pulse generation circuit. . 7. A rotor having a magnet, an excitation coil disposed to face the rotor, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, and driven by the excitation coil. A drive circuit for supplying a pulse, first drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector, non-feedback controlled drive A drive device comprising: a second drive control unit that controls the drive circuit by a control pulse; and a system control unit that selects and operates the first drive control unit and the second drive control unit. 8. The driving device according to claim 7, wherein the rotation detector comprises a magnetic detector. 9. The driving device according to claim 7, wherein the rotation detector comprises a photodetector. 10. The driving device according to claim 7, wherein the rotation detector includes a resolver. 11. The driving device according to claim 7, wherein the position detector comprises a magnetic detector. 12. The system control unit according to claim 7, wherein the system control unit activates the second drive control unit in start-up control, and activates the first drive control unit in steady-state control. The driving device according to the paragraph. 13. The system control unit according to claim 7, wherein the system control unit activates the second drive control unit in stop control, and activates the first drive control unit in steady control. The driving device according to the paragraph. 14. The drive device according to claim 12, wherein in the start-up control, an external work is performed. 15. The drive device according to claim 13, wherein in the stop control, work is performed on the outside. 16. The drive according to claim 12, wherein the system control unit automatically calculates a rotation amount until reaching the target rotation speed based on the target rotation speed in the start control. apparatus. 17. The drive device according to claim 13, wherein the system control unit automatically calculates a rotation amount up to a stop based on a rotation speed in a steady operation in the stop control. 18. The driving device according to claim 12, wherein the system control unit performs an acceleration control on the rotor within a range in which a step response is possible in the start control. 19. The drive device according to claim 13, wherein the system control unit performs a deceleration control on the rotor within a range in which a step response is possible in the stop control. 20. The drive according to claim 7, wherein the first drive control means and the second drive control means are constituted by a common pulse generation circuit. apparatus. 21. A first drive mode for driving an exciting coil based on a drive control pulse feedback-controlled using a detection signal of a rotation speed and a position of a rotor; A method of controlling a motor, wherein the rotor is rotationally driven by selecting and using a second drive mode for driving an exciting coil. 22. The motor control method according to claim 21, wherein in each of the first drive mode and the second drive mode, the motor is caused to perform work to the outside. 23. The start control, wherein the motor is operated in the second drive mode, and in the steady control, the motor is operated in the first drive mode. The method for controlling a motor according to Claim 1. 24. The motor according to claim 21, wherein in the stop control, the motor is operated in the second drive mode, and in the steady control, the motor is operated in the first drive mode. 2. The method for controlling a motor according to claim 1. 25. In the start control, a rotation amount until reaching the target rotation speed is automatically calculated based on the target rotation speed, and the start control is performed based on the drive control pulse set by the calculation. The method of controlling a motor according to claim 23, wherein: 26. In the stop control, a rotation amount up to a stop is automatically calculated based on a rotation speed in a steady operation, and the stop control is performed based on the drive control pulse set by the calculation. The method for controlling a motor according to claim 24, wherein 27. The motor control method according to claim 23, wherein in the start control, acceleration control for the rotor is performed within a range where a step response is possible. 28. The motor control method according to claim 24, wherein in the stop control, deceleration control is performed on the rotor within a range where a step response is possible. 29. The motor control method according to claim 21, wherein the second drive mode is used when operating the motor at an extremely low speed. 30. A sheet conveying apparatus having a conveying member for sandwiching and conveying a sheet, a motor for driving the conveying member, and a system control unit for controlling the motor, wherein the motor includes a rotor having a magnet, and a motor facing the rotor. An excitation coil arranged in a position, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, and an output of the rotation detector. First drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using the output of the position detector, and second drive control for controlling the drive circuit with a non-feedback controlled drive control pulse The system control unit activates the first drive control unit in the control during the steady transport of the transport member, and performs the transport. In at least one control startup conveyance and conveyance stop of wood, the sheet conveying device and performs control for operating the second drive control means. 31. A sheet sensor for detecting a leading edge or a trailing edge of a conveyed sheet, wherein the system control unit starts the control during the stop conveyance based on a detection signal of the sheet sensor. The sheet conveying device according to claim 30, wherein: 32. A sheet conveying apparatus comprising: a conveying member for sandwiching and conveying a sheet; a motor for driving the conveying member; and a system control unit for controlling the motor, wherein the motor includes: a rotor having a magnet; An exciting coil arranged opposite to the other, a rotation detector for detecting a rotation speed of the rotor, a position detector for detecting a position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, an output of the rotation detector First drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using the output of the position detector and a second drive for controlling the drive circuit with a non-feedback controlled drive control pulse The system control unit operates the first drive control unit in the control of the transport member during steady transport, and controls the transport unit. In control during reverse conveyance member, the sheet conveying device and performs control for operating the second drive control means. 33. A sheet sensor for detecting a leading edge or a trailing edge of a conveyed sheet, wherein the system control unit starts the control at the time of the reverse conveyance based on a detection signal of the sheet sensor. 33. The sheet conveying device according to claim 32, wherein: 34. An image forming section for forming a toner image on an image carrier, a paper feeding section for supplying recording paper to the image forming section, and a toner image formed in the image forming section being supplied from the paper feeding section. A transfer unit for transferring to the recording paper, and a system control unit, wherein the paper feed unit is an image forming apparatus having a transport member for temporarily stopping transport during transport and a motor for driving the transport member; A rotor having a magnet; an excitation coil disposed to face the rotor; a rotation detector for detecting a rotation speed of the rotor; a position detector for detecting a position of the rotor; a drive pulse to the excitation coil A first drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector; and Second drive control means for controlling the drive circuit by a drive control pulse subjected to non-feedback control, wherein the system control unit operates the first drive control means in the control of the transfer member during steady transfer. In at least one of the stop control for temporarily stopping the transport member and the start control after the stop, the second control is performed.
An image forming apparatus that performs control for operating a drive control unit. 35. A recording sheet sensor for detecting a leading end of a recording sheet being conveyed, wherein the system control unit starts the control for temporarily stopping the recording sheet based on a detection signal of the recording sheet sensor. 35. The image forming apparatus according to claim 34, wherein: 36. The image forming apparatus according to claim 34, wherein the system control unit performs the start control after the temporary stop based on a signal generated in the image forming unit. apparatus. 37. An image forming section for forming a toner image on an image carrier, a paper feeding section for supplying recording paper to the image forming section, and a toner image formed in the image forming section being supplied from the paper feeding section. A transfer unit for transferring the recording paper to the recording paper, a reversing conveyance member for reversing the front and back of the recording paper by reversing the conveyance direction of the recording paper, and a motor for driving the reversal conveyance member, and a toner image is formed on one surface. A double-sided paper feeding unit for re-feeding the recording paper to the image forming unit and a system control unit, wherein the motor is a rotor having a magnet, and is disposed to face the rotor. Excitation coil, a rotation detector for detecting the rotation speed of the rotor, a position detector for detecting the position of the rotor, a drive circuit for supplying a drive pulse to the excitation coil, an output of the rotation detector and the position First drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using the output of the output device, and second drive control means for controlling the drive circuit with a non-feedback controlled drive control pulse; Wherein the system control unit activates the first drive control means in the control of the reverse transport member at the time of steady transport, and controls the second drive control means in the control of the reverse transport member during the reverse transport. An image forming apparatus that performs control for operating the image forming apparatus. 38. A recording paper sensor for detecting a leading edge of the recording paper being conveyed, wherein the system control unit starts the control for temporarily stopping based on a detection signal of the recording paper sensor. The image forming apparatus according to claim 37, wherein: 39. An image forming apparatus comprising: an image carrier; an image forming unit that forms a toner image on the image carrier; a motor that drives the image carrier; and a system control unit. A rotor having: an excitation coil disposed to face the rotor; a rotation detector for detecting a rotation speed of the rotor; a position detector for detecting a position of the rotor; a drive circuit for supplying a drive pulse to the excitation coil; First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector; and the drive circuit by a non-feedback controlled drive control pulse The system control unit operates the first drive control unit in the drive control of the image carrier at a steady speed. In at least one of the start control and stop control of the image bearing member, an image forming apparatus and performs control for operating the second drive control means. 40. The image forming apparatus according to claim 39, further comprising a plurality of said image carriers, a plurality of said image forming units, and a plurality of said motors. 41. A stacking unit for stacking a plurality of recording sheets, a binding unit for binding the recording sheets on the stacking unit, a conveying member for conveying the recording sheet to the stacking unit, a motor for driving the conveying member, and a system. In the binding device having a control unit, the motor includes: a rotor having a magnet; an exciting coil disposed to face the rotor; a rotation detector that detects a rotation speed of the rotor; and a position detection that detects a position of the rotor. A drive circuit for supplying a drive pulse to the excitation coil; a first drive control means for controlling the drive circuit with a drive control pulse feedback-controlled using an output of the rotation detector and an output of the position detector. And second drive control means for controlling the drive circuit by a drive control pulse subjected to non-feedback control. In the control for temporarily stopping the conveying member to supply the recording paper to the stacking unit by activating the conveying member after temporarily stopping while holding the end portion, the second driving control unit includes the second driving control unit. A post-processing device for performing control to operate the post-processing device. 42. A recording paper sensor for detecting a leading edge of the recording paper being conveyed, wherein the system control unit starts the control for temporarily stopping based on a detection signal of the recording paper sensor. 42. The post-processing device according to claim 41, wherein 43. An image forming system comprising: an image forming apparatus for forming an image on a recording sheet; and the post-processing apparatus according to claim 41. 44. An image transport apparatus for transporting a document to a reading position and then reversing the original and transporting the document to the reading position again, comprising: a reverse transport member for reverse transporting the document; A rotor having: an excitation coil disposed to face the rotor; a rotation detector for detecting a rotation speed of the rotor; a position detector for detecting a position of the rotor; a drive circuit for supplying a drive pulse to the excitation coil; First drive control means for controlling the drive circuit by a drive control pulse feedback-controlled using the output of the rotation detector and the output of the position detector; and the drive circuit by a non-feedback controlled drive control pulse And a system control unit. The system control unit controls the reverse conveyance member at the time of steady conveyance. And a control unit that operates the first drive control unit and controls the second drive control unit when the reversing conveyance member is turned over. 45. A document sensor having a document sensor for detecting a leading edge of a document to be conveyed, wherein the system control unit starts control during the reverse conveyance based on a detection signal of the document sensor. Item 45. The document conveying device according to Item 44. 46. An image transport apparatus comprising: a transport member that transports a document to be transported and temporarily transports the document to supply the document to a reading position; a motor that drives the transport member; and an image transport device that includes a system control unit. A rotor having a magnet; an excitation coil disposed to face the rotor; a rotation detector for detecting a rotation speed of the rotor; a position detector for detecting a position of the rotor; and supplying a drive pulse to the excitation coil. A drive circuit, a first drive control unit that controls the drive circuit by a drive control pulse that is feedback-controlled using the output of the rotation detector and the output of the position detector, and a non-feedback controlled drive control pulse. A second drive control unit that controls the drive circuit; and wherein the system control unit performs the second (1) A document feeder, wherein the drive control means is operated, and in the start control of the conveying member, control for operating the second drive control means is performed. 47. An apparatus according to claim 46, further comprising a document sensor for detecting a leading edge of the conveyed document, wherein said system control unit starts said activation control based on a detection signal of said document sensor. Document transport device according to the above. 48. A document reading device, comprising: the document feeding device according to claim 44; and an image reading unit that reads an image of a document transferred at a reading position. 49. An image forming system, comprising: the document reading device according to claim 48; and an image forming unit that forms an image based on image information generated by the document reading device.