JPH09114348A - Driving controller for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control a rotating member and to prevent the density irregularity of an output image and the deviation of registration from occurring by providing a device with a pulse generation means, an arithmetic means and a control means. SOLUTION: When position/speed data are outputted to a control part 38 from a position/speed arithmetic part 37 every sampling period, the arithmetic result of the arithmetic part 37 is compared with a reference value and an error signal is extracted by the control part 38. A control signal is generated based on the error signal and outputted to a driving circuit 33 so as to control the position and the speed of a recording paper carrying belt 24. Since the moving distance and the average speed of the belt 24 in the respective sampling periods are calculated based on a calculated value obtained by counting an interval between the respective rising edges of encoder pulses whose periods are finished in the respective sampling periods by using a clock pulse and the position and the speed of the belt 24 are controlled based on the calculated result, they are controlled based on the precise data obtained by actual measurement. As the result, the belt 24 is accurately controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device of an image forming apparatus for controlling the drive of a rotary member such as an image carrier or a transfer material conveying body, and more particularly to a rotary controller capable of controlling the rotary member with high accuracy. In addition, the present invention relates to a drive control device for an image forming apparatus, which prevents uneven density of an output image and deviation of registration.

[0002]

2. Description of the Related Art In an image forming apparatus using an electrostatic image forming process such as a laser printer or a copying machine, an image carrier such as a photosensitive drum, a transfer drum or an intermediate transfer belt, or a transfer belt or the like is used. A rotating member such as a transfer material transporter is provided, and it is an important subject to suppress the position and speed fluctuations of the rotating member to prevent density unevenness on the output image and misregistration.

Therefore, as a drive control device for a conventional image forming apparatus, which suppresses such position and speed fluctuations of the rotating member, there is, for example, one shown in US Pat. No. 5,237,251.

The drive control device of this image forming apparatus attaches a rotary encoder to the belt-shaped rotary member, calculates the position and speed of the belt-shaped rotary member in the sampling cycle from the encoder pulse generated from the rotary encoder, and the calculation result. The belt-shaped rotating member is controlled based on the above.

To calculate the position and speed of the belt-shaped rotary member in the sampling period, as shown in FIG. 15, the latest value T _n obtained by counting the encoder pulse period of the sampling period S _n with the clock pulse is stored, the last rising edge of the encoder pulse sampling period S _n to the end time of the sampling period S _n counted by the clock pulse (counts _{Δt n), Δt n / T} n = α (1
>Α> 0). Then, (1) the sampling period S _{n is} obtained by adding the number N of encoder pulses that have completed the period and Δt _n / T _n to the sampling period.
The number of encoder pulses (N + α) between them is calculated, and (2) the number of encoder pulses (N + α) is multiplied by the moving distance per encoder pulse to calculate the moving distance of the belt-shaped rotating member of the sampling cycle S _n , ) encoder pulse number (n + alpha) is divided by the sampling period S _n calculates an average frequency of the encoder pulses of the sampling period S _n, calculates the average speed of the sampling period S _n further over the conversion counting thereto .

[0006]

However, the conventional image type
According to the drive control device of the composition device, Δt_n/ T_n= Based on α
Then calculate the moving distance and average speed of the sampling cycle.
Therefore, the sampling cycle S_nAt the end of
The period of the encoder pulse that is not completed is T _nAnd etc
If yes, Δt_n/ T_n= Α finally completed one cycle
Sampling frequency from encoder pulse and its end time
Period S_nAccurately represent the ratio of encoder pulses to the end of
However, in reality, there are speed fluctuations in the rotating member.
, The encoder pulse period changes with time,
Encoder pulse ratio, that is, the number of encoder pulses is small
It is not an exact representation of several points. Therefore, like this
When using control with such inaccurate detection values, image carrier and transfer material
It is not possible to control rotating members such as the carrier with high accuracy,
This may cause uneven density in the output image or misregistration.
There is a fear.

Therefore, an object of the present invention is to enable the rotating member to be controlled with high accuracy, so that density unevenness of an output image and
An object of the present invention is to provide a drive control device of an image forming apparatus capable of preventing the occurrence of registration deviation.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, the present invention enables the rotating member to be controlled with high accuracy to prevent uneven density of an output image and misregistration of the rotating member. A pulse generating means for generating a pulse signal having a cycle corresponding to a position or a speed; and a pulse signal generated by the pulse generating means for a rotating member in a predetermined sampling cycle from a pulse signal having completed a cycle in a predetermined sampling cycle. An image forming apparatus provided with a calculating means for calculating the moving distance and the average speed, and a controlling means for controlling the position and speed of the rotating member by controlling the driving means based on the calculation result of the calculating means to output a driving signal. And a drive control device for the same.

The calculating means includes pulse counting means for counting clock pulses over the rising edge interval of the pulse signal which has been completed in a predetermined sampling period, and storage means for storing the count value counted by the pulse counting means. , The moving distance of the rotating member in the predetermined sampling period is calculated by the product of the moving distance per pulse of the pulse signal and the number of pulse signals completed in the predetermined sampling period, and stored in the storage means. The average value of the rotating member during the predetermined sampling period is calculated by adding all the count values of the predetermined sampling period to calculate the added value and dividing the moving distance of the rotating member by the product of the period of the clock pulse and the added value. A position / speed calculation means for calculating speed is provided.

It is preferable that the pulse generating means comprises a rotary encoder, or marks formed on the rotary member at equal intervals, and a mark reading device for reading the marks.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A drive control device for an image forming apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the arrangement of an image forming apparatus according to the first embodiment of the present invention. The image forming apparatus 1 includes an image reading unit 2 a that reads a document 4 mounted on a platen glass 3 and a recording paper 19 that reads the read image.
And an image recording section 2b for recording.

The image reading section 2a includes a light source 5 for illuminating the original 4, a scanning mirror 6 for guiding the reflected light of the original 4 to an imaging lens 8, reflection mirrors 7a and 7b, and an imaging lens 8.
The reflected light focused by
The CCD sensor 9 for color separation and reading using the filter of B and the image signal output from the CCD sensor 9 are Y
(Yellow), M (magenta), C (cyan), BK
The image processing unit 10 has a complementary color separation into (black) and stores it in a memory (not shown).

The image recording unit 2b has a laser light source for emitting a laser beam modulated based on the image data stored in the memory of the image processing unit 10 and a laser having a rotating polygon mirror for deflecting the emitted light. Optical scanning units 11a-11
d, drive rolls 13a to 13d, tension roll 1
4a to 14d and idler rolls 15a to 15d, and belt-shaped photoreceptors 12a to 12d that rotate while receiving exposure to laser light to form an electrostatic latent image on the surface,
Charging devices 16a to 16d that give electric charges necessary for latent image formation to the belt-shaped photoreceptors 12a to 12d, and the belt-shaped photoreceptor 12
a developing device 18a to 18d for developing the electrostatic latent image formed on a to 12d with a toner, and a paper feed tray 2 from the paper feed tray 21.
2, a registration roll 23 that sends out the recording paper 19 fed through 2 at a predetermined timing, a drive roll 25, a tension roll 26, and idler rolls 27a, 27.
A recording paper conveyance belt 24 which is stretched around b and which conveys the recording paper 19 delivered from the registration roll 23, and a suction device for electrostatically adsorbing the recording paper 19 by applying a predetermined charge to the recording paper conveyance belt 24. Charger 28 and recording paper transport belt 24
The belt-shaped photoconductor 12a is attached to the recording paper 19 conveyed through
-12d transfer charger 29a-2 for transferring the toner image
9d and the recording paper 19 which has been transferred, the recording paper transport belt 2
4, and a fixing device 31 for fixing the transferred image on the recording paper 19 and then discharging it to a discharge tray 32.
And a charger 34 for removing static electricity from the recording paper transport belt 24.
have.

FIG. 2 shows the construction of the drive control device of the image forming apparatus for controlling the drive of the recording paper transport belt 24 in the first embodiment. This drive control device includes a motor 34 that generates a rotation torque based on a drive signal output from the drive circuit 33, and a rotation torque that is generated by the motor 34 and that drives the drive roll 2 of the recording paper conveyance belt 24.
5, a rotary encoder 36 connected to the rotation shaft of the drive roll 25 and a rotary encoder 36 for generating a pulse signal having a cycle corresponding to the position or speed of the recording paper transport belt 24, and the rotary encoder 36. A position / speed calculation unit 37 for calculating the moving distance and the average speed of the recording paper transport belt 24 during a predetermined sampling period from the encoder pulse that has completed a predetermined sampling period among the encoder pulses. A control unit 38 that compares the calculation result of the unit 37 with a reference value to extract an error signal and generates a control signal from the error signal.
And a drive circuit 33 that amplifies the power of a control signal output from the control unit 38 and supplies it to the motor 34 as a drive signal.

It is desirable that the motor 34 be driven at low cost and with high accuracy, and for example, a DC brushless motor having a shaft subjected to gear cutting processing or a stepping motor is used. When a stepping motor is used, in order to reduce fluctuations in rotation speed and power consumption, constant current driving is performed with a current value that is as small as possible while considering load torque.

The reduction gear 35 is made of, for example, polyacetal (PO) which has good tooth contact and hardly transmits torque fluctuation.
A helical gear composed of M) is used.

The position / speed calculator 37, as shown in FIG. 3, is a D-flip flop (hereinafter referred to as DF / F).
A first signal generation circuit 4 including 39, 40, 41 and a NAND circuit 42 for generating a clear signal and an interrupt request signal.
3, D-F / F 44, 45, 46 and NAND circuit 47
Including a second signal generating circuit 48 for generating a clear signal and a counter trigger signal, a clock counter 49 for counting clock pulses, an encoder pulse generated by the rotary encoder 36, and outputting as an encoder pulse number. Decoding the encoder counter 50 and the encoder pulse number of the encoder counter 50,
The decoder 51 that outputs a memory trigger signal from the output terminal corresponding to the encoder pulse number, and the clock counter 4 that is triggered by the memory trigger signal of the decoder 51
Storage circuit 52 of D / F-F that stores read a 9 count value _0, 52 _1, 52 _2, and · · 52 _n, the memory circuit 52 _0, 52 _1, 52 _2, · · 52 _n of 1 When an interrupt request signal is input from one of the selected data selector 53 and the D / F / F 39, that is, when the rising edge of the sample pulse is detected, the storage circuits 52 ₀ , 52 ₁ , 52 ₂ , ... CP for sequentially selecting and reading the stored contents of 52 _n and performing a predetermined calculation based on the read data to calculate the moving distance X _n and the average speed V _n of the recording paper transport belt 24 in the sampling cycle.
It is configured with U54.

The first signal generating circuit 43 generates a clear signal at the rising edge of the sample pulse to generate an encoder counter 50 and storage circuits 52 ₀ , 52 ₁ , 52 ₂ , ...
_.52n is cleared, and the second signal generation circuit 48 is configured to generate a clear signal at the rising edge of the encoder pulse to clear the clock counter 49. Therefore, the clock counter 49 counts clock pulses over each cycle of the encoder pulse, and the encoder counter 50 counts encoder pulses over each cycle of the sample pulse. The memory circuits 52 ₀ , 52 ₁ , 52 ₂ , ... 52 _n respectively store the number of clock pulses in each cycle of each encoder pulse in each cycle of the sample pulse.

The CPU 54 includes storage circuits 52 ₀ , 52 ₁ ,
All the count values are added while sequentially reading the clock pulse count values of each cycle of each encoder pulse from 52 ₂ , ..., 52 _n (this added value is N _n ). And
(1) Moving distance per encoder pulse x sample pulse Recording paper transport belt 24 in the sampling cycle depending on the number of encoder pulses that have completed one cycle in one cycle
It calculates the moving distance X _n of, calculating the average velocity V _n of the recording sheet conveying belt 24 in the sampling period (2) moving distance X _n ÷ (clock pulse period × addition value N _n).

Position / speed calculator 37 and controller 38
Is usually provided inside the front panel 55 of the image forming apparatus 1 as shown in FIG. 4A, but FIG.
As shown in FIG. 5, when the computer 56 that can remotely control the image forming apparatus 1 is connected, the computer 5
It is also possible to substitute 6 with the above-mentioned function.

FIG. 5 shows a clock pulse CLK and an encoder pulse E output from the rotary encoder 36.
The NCODER, the sample pulse SAMPLE output from the control unit 38, and the position / velocity data DATA obtained based on the number of clock pulses of each encoder pulse completed in the sampling period are shown.

The drive control operation of the recording paper transport belt 24 in the first embodiment will be described below with reference to FIGS. 6 and 7.

When the image of the original 4 is read by the image reading section 2a, electrostatic latent images are formed on the belt-shaped photoreceptors 12a to 12d, and the developing machines 18a to 18d develop the electrostatic latent images with toner. At the same time, a predetermined control signal is output from the control unit 38, and the drive circuit 33 drives the motor 34 with a drive signal according to the control signal. When the motor 34 is driven, its rotational torque is transmitted to the drive roll 25 via the reduction gear 35, and the recording paper conveyance belt 24 is rotated at a predetermined speed.

When the recording paper carrying belt 24 rotates, the position of the recording paper carrying belt 24 from the rotary encoder 36,
Alternatively, an encoder pulse having a cycle corresponding to the speed is output and input to the position / speed calculator 37.

In the position / speed calculator 37, when the rising edge of the encoder pulse is detected (S ₁ ), the encoder counter 50 adds 1 to the count value so far (S ₂ ), and this count value is used as the encoder pulse. It is output to the decoder 51 as a number. The decoder 51 decodes the encoder pulse number and outputs a memory trigger signal from one of the output terminals Y _{0 to} Y _n corresponding to the encoder pulse number,
Trigger one of the memory circuits 52 ₀ , 52 ₁ , 52 ₂ , ... 52 _n . On the other hand, the clock counter 49 has counted the clock pulses from the time when the rising edge of the previous encoder pulse was detected, and the triggered storage circuit 52 ₀ ,
_{52 1, 52 2, ·· 52} n stores reads the count value of the clear previous clock counter 49 (S _3). Immediately after that, a clear signal is generated from the second signal generating circuit 48, and the count value of the clock counter 49 is reset (S ₄ ). After that, the clock pulse is counted, and similarly, the clock pulse is counted until the rising edge of the encoder pulse is detected next (S ₅ ). In this way, clock pulses are counted over each cycle of each encoder pulse, and each count value is sequentially stored in the storage circuits 52 ₀ , 5
It is stored in 2 ₁ , 52 ₂ , ... 52 _n . For example,
Referring to the sampling cycle S ₁ in FIG. 5, the number of clock pulses in each cycle of the three encoder pulses in the time period A slightly preceding the cycle is the memory circuits 52 ₀ , 5
It is stored in 2 ₁ , 52 ₂ .

On the other hand, if you enter a sample pulse from the control unit 38 (S _10), an interrupt request signal is output to the CPU54 the _{D-F / F39 (S 11} ). When the CPU 54 receives the interrupt request signal, the memory circuits 52 ₀ , 5
All the count values are added while sequentially reading the clock pulse count values of each cycle of each encoder pulse from 2 ₁ , 52 ₂ , ..., 52 _n (S ₁₂ ). Then, (1) the moving distance per encoder pulse × the moving distance X _n of the recording paper conveyance belt 24 in the sampling cycle according to the number of encoder pulses that have completed the cycle in one cycle of the sample pulse.
(2) Moving distance X _n ÷ (clock pulse period ×
The average speed V _n of the recording paper transport belt 24 in the sampling cycle is calculated from the added value N _n ) (S ₁₃ ). For example, in FIG. 5, when the sampling cycle S ₁ is viewed,
The calculation result based on the clock number of each encoder pulse of the time period A described above is obtained as the position / speed data A ′.
This position / velocity data is output to the control unit 38. After that, a clear signal is generated from the first clear signal generation circuit 43, and the encoder counter 50 and each storage circuit 52 ₀ ,
The stored contents of 52 ₁ , 52 ₂ , ..., 52 _n are reset (S ₁₄ ), and the interrupt processing of the CPU 54 ends (S ₁₅ ).

In this way, the sampling periods S ₁ , S
_{2. When} the position / speed data is output from the position / speed calculation unit 37 to the control unit 38 for each ...
An error signal is extracted by comparing the calculation result of the speed calculator 37 with a reference value, and a control signal is generated from this error signal and output to the drive circuit 33 to control the position and speed of the recording paper transport belt 24. .

As described above, in the present embodiment, the moving distance of the recording paper transport belt 24 in each sampling cycle is calculated from the count value obtained by counting the rising edge intervals of the encoder pulses that have been completed in each sampling cycle with the clock pulse. Since the average speed is calculated and the position and speed of the recording paper conveyance belt 24 are controlled based on this, it is possible to perform control based on accurate data obtained by actual measurement, and to control the recording paper conveyance belt 24 with high accuracy. Become. For this reason,
It is possible to prevent density unevenness of the output image and misregistration from occurring.

In the above embodiment, the recording paper conveying belt 24
The pulse generating means for generating a pulse having a pulse period according to the position and speed of the recording medium is constituted by a rotary encoder. For example, as shown in FIG. The mark 57 and a mark detector 58 for detecting the mark 57 may be formed by combining the light emitting element and the light receiving element. With such a configuration, since the movement of the recording paper conveyance belt 24 is directly detected, it is possible to realize more accurate drive control. The mark detector 58 may be composed of a line image sensor. In addition, the position / speed calculator 36
Is a CPU that operates at sufficiently high speed for the data processing time
When 54 can be used, as shown in FIG. 9, the CPU 54 may read the measured value of the clock pulse from the counter 49 at each rising edge of the encoder pulse and store it in the memory. . In this case, the circuit configuration can be simplified and the cost can be reduced.

FIG. 10 shows the configuration of a drive control device for an image forming apparatus according to the second embodiment of the present invention. This image forming apparatus includes a laser light scanning unit 5 having a laser light source that emits laser light modulated based on image data, a rotary polygon mirror that deflects the emitted light, and the like.
9, a photoconductor drum 60 that receives a driving force from a photoconductor drive mechanism described later and rotates in the sub-scanning direction, and a photoconductor drum 6
A charger 61 that charges 0, a developing device 62 that develops the electrostatic latent image formed on the photosensitive drum 60 with toner, a motor 63 that generates rotational torque and is positioned on the frame 71, and a motor 63 A photoconductor driving mechanism including a torque transmission mechanism 64 for transmitting the rotating torque to the photoconductor drum 60, a rotary encoder 65 for generating a pulse signal having a cycle corresponding to the position or speed of the photoconductor drum 60, and a recording paper 67. A sheet feeding device 66 for feeding the toner image to the transfer portion of the photosensitive drum 60, a transfer device 68 for transferring the toner image of the photosensitive drum 60 onto the recording paper 67 guided to the transfer portion,
A fixing device 69 for fixing the transferred image on the recording paper 67 and a discharge tray 70 for discharging the recording paper on which the transferred image is fixed are configured.

FIG. 11 shows the configuration of the feedback control system of the drive control device of the image forming apparatus according to the second embodiment. In this drive control device, the position / speed calculator 37 described in the first embodiment inputs the encoder pulse generated from the rotary encoder 65 in accordance with the rotation of the photosensitive drum 60, so that the photosensitive drum 60 moves. The moving distance and the average speed of the sampling cycle are calculated, and the control unit 38 controls the photosensitive drum 60 via the drive circuit 73 based on the calculation result. The circuit configuration of the position / speed control unit 37 is the same as that described in the first embodiment, so description thereof will be omitted here.

The torque transmission mechanism 64 uses a gear train or a timing belt and includes a charger 61 and a developing device 6.
2. The speed is adjusted according to the number of rotations required by the paper feeding device 66, the transfer device 68, and the fixing device 69. A helical gear made of a polyacetal (POM) molding material is used for the gear in order to suppress the rotational fluctuation caused by tooth contact and ensure a high precision drive. For the timing belt, in order to ensure high precision drive by increasing the rotation fluctuation frequency generated by tooth contact, use a belt with a pitch as small as possible in consideration of load torque. When the load torque is small, if a steel belt is used instead of the timing belt, rotation fluctuation due to tooth contact is eliminated, so that more accurate driving can be realized.

When the timing belt and the steel belt are used, a belt tensioner as shown in FIGS. 12 (a) and 12 (b) is used. This belt tensioner includes a base 71a fixed to a frame 71a, a rod portion 76a having a roller 76 at its tip which rotates in contact with a belt 78, and a sliding portion for slidably supporting the rod portion 76a in the arrow direction. 77 and an elastic member 79 attached between the rear end of the rod portion 76a and the base 71a, and a predetermined tension is constantly applied to the belt 78 by elastic deformation of the elastic member 79.

Also in the configuration of the second embodiment, as in the first embodiment, since control is performed based on accurate data obtained by actual measurement, the photosensitive drum 60 can be controlled with high accuracy. As a result, it is possible to prevent the density unevenness of the output image and the deviation of the registration from occurring.

FIG. 13 shows the arrangement of an image forming apparatus according to the third embodiment of the present invention. The image forming apparatus according to this embodiment receives a rotational torque from a motor 80 and is driven to supply a recording paper in a direction of an arrow.
A recording paper conveyance belt 83 that conveys the recording paper supplied from the supply roll 81 when driven by a rotational torque from the motor 82, a suction device 84 that adsorbs the recording paper to the recording paper conveyance belt 83, and a motor 85a. Reduction gear 8 from ~ 85d
6a to 86d to drive the photoconductor drums 87a to 87d.
87d and laser beam scanning units 88a-8 for exposing the photosensitive drums 87a-87d to form an electrostatic latent image on the surface.
8d and Y, M, C, and BK developing units 89a to 89d for developing the electrostatic latent images on the photosensitive drums 87a to 87d with toner.
And transfer rolls 90a to 90d for transferring the color toner images formed on the photosensitive drums 87a to 87d onto the recording paper conveyed through the recording paper conveyance belt 83, and the photosensitive drums before electrostatic latent image formation. It includes chargers 91a to 91d for charging 87a to 87d, and a fixing roll 92 for fixing the transferred image on the recording paper which has been transferred.

In such an image forming apparatus, a motor 82 for driving the recording paper conveying belt 83, Y, M, and
It is possible to control the motors 85a to 85d that drive the C and BK photoconductor drums 87a to 87d, respectively, based on the number of clock pulses at each rising edge interval of the encoder pulse in each sampling period that is actually measured by the drive control device described above. For example, it is possible to control the recording paper conveyance belt 83 and each of the photoconductor drums 87a to 87d with high accuracy, and to suppress the rotation fluctuation of each. Therefore, it is possible to prevent color unevenness of the output image and color registration deviation.

Further, as shown in FIG. 14, by applying the drive controller to a color image forming apparatus using an intermediate transfer belt 93 driven by a motor 94, a secondary transfer is performed by a supply roll 96 rotated by a motor 95. It is also possible to prevent color unevenness of the color toner image and color registration deviation when the color toner image is transferred to the recording paper supplied to the spot by the secondary transfer roll 97.

[0039]

As described above, according to the drive control device for an image forming apparatus of the present invention, each rising edge interval of the encoder pulse which is completed in each sampling cycle is sampled from the count value obtained by counting the clock pulse. Since the moving distance and the average speed of the rotating member of the cycle are calculated and the position and speed of the rotating member are controlled based on this, it becomes possible to control the rotating member with high accuracy, and as a result, the rotating member rotates. It is possible to suppress fluctuations and prevent image unevenness and registration deviation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a drive control device according to the first embodiment.

FIG. 3 is an explanatory diagram showing a circuit configuration of a position / speed calculation unit according to the first embodiment.

FIG. 4 is an explanatory diagram showing an arrangement of the drive control device according to the first embodiment.

FIG. 5 is a timing chart showing each pulse signal and data according to the first embodiment.

FIG. 6 is a flowchart showing an operation according to the first embodiment.

FIG. 7 is a flowchart showing an operation according to the first embodiment.

FIG. 8 is an explanatory diagram showing a modified example according to the first embodiment.

FIG. 9 is an explanatory diagram showing another modified example according to the first embodiment.

FIG. 10 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a configuration of a drive control device according to a second embodiment.

FIG. 12 is an explanatory diagram showing a belt tensioner of the torque transmission mechanism according to the second embodiment.

FIG. 13 is an explanatory diagram showing a third embodiment of the invention.

FIG. 14 is an explanatory diagram showing a modified example of the third embodiment.

FIG. 15 is a timing chart showing a pulse processing method of a drive control device of a conventional image forming apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 image forming apparatus 2a image reading apparatus 2b image recording apparatus 3 platen 4 original document 5 light source 6 scanning mirrors 7a, 7b reflection mirror 8 imaging lens 9 CCD sensor 10 image processing unit 11a to 11d laser light scanning unit 12a to 12d belt-shaped photosensitive Body 13a to 13d Drive roll 14a to 14d Tension roll 15a to 15d Idler roll 16a to 16d Charger 18a to 18d Developing machine 19 Recording paper 21 Paper feed tray 22 Paper feed roll 23 Registration roll 24 Recording paper transport belt 25 Drive roll 26 Tension Rolls 27a, 27b Idler rolls 28 Adsorption chargers 29a to 29d Transfer chargers 30 Separation chargers 31 Fixers 32 Discharge trays 33 Drive circuits 34 Motors 35 Reduction gears 36 Rotary encoders 37 Positions / speeds Calculation unit 38 Control unit 39 D-flip-flop 40 D-flip-flop 41 D-flip-flop 42 NAND circuit 43 First signal generation circuit 44 D-flip-flop 45 D-flip-flop 46 D-flip-flop 47 NAND circuit 48th 2 signal generation circuit 49 clock counter 51 decoder 52 _{1 to} 52 _n storage circuit 53 data selector 54 CPU 55 front panel 56 calculator 57 mark 58 mark detector 59 laser light scanning unit 60 photoconductor drum 61 charger 62 developer 63 motor 64 torque transmission mechanism 65 rotary encoder 66 paper feeder 67 recording paper 68 transfer device 69 fixing device 70 discharge tray 71 frame 73 drive circuit 76 roller 76a rod member 77 sliding part 78 belt 79 elasticity Material 80 Motor 81 Supply Roll 82 Motor 83 Recording Paper Conveying Belt 84 Adsorber 85a-85d Motor 86a-86d Reduction Gear 87a-87d Photoreceptor Drum 88a-88d Laser Light Scanning Unit 89a-89d Developing Machine 90a-90d Transfer Roll 91a- 91d Charging device 92 Fixing roll 93 Intermediate transfer belt 94 Motor 95 Motor 96 Supply roll 97 Secondary transfer roll

Claims (3)

[Claims] 1. A torque generating means for generating a rotational torque by driving based on a drive signal output from the driving means, an image carrier for rotating the rotational torque by inputting the rotational torque from the torque generating means, and a transfer material conveyance. In an image forming apparatus including a rotating member such as a body, a pulse generating unit that generates a pulse signal having a cycle according to the position or speed of the rotating member, and a predetermined pulse signal from among the pulse signals generated from the pulse generating unit. A calculating means for calculating a moving distance and an average speed of the rotating member in the predetermined sampling cycle from a pulse signal whose cycle is completed in the sampling cycle; and controlling the driving means based on a calculation result of the calculating means, An image characterized by comprising control means for controlling the position and speed of the rotating member by outputting a drive signal Drive control device for forming apparatus. 2. The calculation means stores pulse count means for counting clock pulses over a rising edge interval of a pulse signal completed in the predetermined sampling cycle, and count values counted by the pulse count means. And the moving distance of the rotating member in the predetermined sampling period, which is determined by the product of the storage means and the number of movements per pulse of the pulse signal and the number of pulse signals that have completed the period in the predetermined sampling period. Is calculated, and all the count values of the predetermined sampling cycle stored in the storage means are added to calculate an added value, and the moving distance of the rotating member is calculated based on the cycle of the clock pulse and the added value. A position for calculating the average speed of the rotating member during the predetermined sampling period by dividing by a product. The drive control device for an image forming apparatus according to claim 1, wherein the drive / control device includes a position / speed calculation means. 3. The drive control device for an image forming apparatus according to claim 1, wherein the pulse generating means includes a rotary encoder or marks formed at equal intervals on the rotating member, and a mark reading device for reading the marks. .