JP2002357994A - Motor rotational speed control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor rotational speed control device which prevents an image quality deterioration such as color slippage, etc., by suppressing the uneven pitch correction of an image and in which a motor rotational speed correction means is constructed at low cost without increasing the size of the device. SOLUTION: An auxiliary member means having a rotational inertia function to such an extent of not increasing the size is integrally formed on a photoreceptor drum is constituted. The control means interrupts correction while moving a pattern disconnected part having few amounts of distances being a joint where the motor rotational speed cannot be corrected, suppresses the rotational unevenness of the photoreceptor drum by a speed error suppressing effect based on the inertia function, and corrects a speed error during a major portion of movement. The motor rotational speed control device has the control means which simplified in such a manner at a low cost, and a motor rotational speed correction means which corrects a motor rotational speed to converge and correct the rotational unevenness of the photoreceptor drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed correction control of a motor means for executing movement of a moving medium. And a sensor detecting means, which determines a minute distance moving speed of the moving medium by detecting, and relates to a moke rotation speed control device for correcting a motor rotating speed of the motor means, and particularly relates to a The present invention relates to processing control means for a pattern break portion of the minute distance detecting pattern means for detecting a moving speed.

[0002]

2. Description of the Related Art Heretofore, the rotation speed of a motor means for controlling the movement of a moving medium of a recording apparatus has been set and controlled at a fixed number of revolutions based on specifications of the recording apparatus which are set in advance. Accordingly, the moving speed of the moving medium is similarly fixedly set by the transmission coefficient of the gear arrangement or the like as the power transmitting means and the set rotation speed of the motor means. However, even if the rotation speed of the motor means is executed by motor excitation control capable of coping with load fluctuation, the moving speed of the moving medium can be kept constant due to the effect of instantaneous load fluctuation such as backlash due to the gear arrangement. However, the moving speed was uneven. In particular, in the case of a moving medium that controls image formation, such as a photosensitive drum, which is one of the moving media of the recording apparatus, rotation unevenness, which is a moving speed unevenness, directly affects image formation, and image line pitch unevenness. In some cases, it appeared. Therefore, a minute distance detection pattern means is formed on the surface of the photosensitive drum or the like or an auxiliary member corresponding thereto, and the minute distance movement is determined by detecting the movement speed of the minute distance with respect to the rotation by the sensor detection means. A motor rotation speed having motor speed correction means for measuring a minute moving distance speed of the photosensitive drum or the like and having a predetermined amount corresponding to the result to correct the rotation speed of the motor means by having the speed determination means. The control device was configured. That is, the rotational speed of the photosensitive drum is measured for each minute distance amount, and the rotational speed of the motor means is corrected so as to converge to the set speed of the photosensitive drum based on the result. The occurrence of pitch unevenness was suppressed. Further, the setting of the minute distance amount included in the minute distance detection pattern means includes a one line width distance of a formed image,
Alternatively, by using an integral multiple of the distance of one line as a unit, the speed can be compared in a state where the moving speed of the minute moving distance that can be detected is synchronized with the moving speed of each line, and the movement of the image line can be performed. Since the rotation speed correction of the motor means can be executed in a state synchronized with the width, not only the convergence correction of the rotation speed unevenness of the photoreceptor drum but also the occurrence of the pitch unevenness of the image line can be suppressed, and the rotation can be completely removed. The pitch unevenness of the non-existent image lines is made inconspicuous throughout the formed image.

[0003]

However, in the above conventional example, the set value of the minute distance amount provided by the minute distance detecting pattern means is determined by the peripheral length on the surface of the moving medium, such as the photosensitive drum. Irrespective of the above, since the distance is set to a distance of one line width or a distance of an integral multiple of one line width, there are the following disadvantages.

Since the entire length of the surface of the photosensitive drum or the like is not constituted by an integral multiple of the set value of the minute distance amount, the minute distance detecting pattern means uses the sensor distance detecting means to detect the minute distance amount. This is composed of a pattern forming portion that can be detected and a pattern break portion that cannot be detected.
As a result, when the rotational movement of the photosensitive drum or the like is moving along the pattern break, it is naturally impossible to measure the moving speed with respect to the minute moving distance. Is suspended, and in some cases,
There was the disadvantage that speed deviations could occur during the interruption. Therefore, in order to prevent a speed deviation due to the interruption of the rotation speed correction of the motor means due to the pattern break, a plurality of sensor detecting means are arranged with different phases, and the sensor detection which does not pass through the pattern break is performed. Means has been devised to execute continuous and uninterrupted motor rotation speed correction control by selecting a means and relaying it. However, such means requiring a plurality of sensor detection means are required in an apparatus aiming at low cost. However, using a plurality of sensor detecting means which are not inexpensive so as not to degrade the image quality has a disadvantage that the cost is increased. Originally, in a low-cost machine in a black-and-white printing apparatus, the suppression of pitch unevenness of image lines was implemented by controlling a motor means. In some cases, the image quality was significantly reduced. For this purpose, rotation unevenness has been removed by using a high-precision motor means, or a disk-shaped auxiliary member having an inertia function has been attached to a moving medium to remove rotation unevenness due to inertia. Therefore, although it is a low cost machine, in the case of the former, a significant increase in cost due to a high-precision motor occurs, and in the case of the latter, if a disk-shaped auxiliary member that gives sufficient inertia to the moving medium is designed, it will be large, One disadvantage remains that the device itself becomes larger.

An object of the invention according to the present application is to mount a disk-shaped auxiliary member having a decent inertia function so as not to increase the size of the apparatus itself so as to be integrated with a moving medium, and to provide a set of minute distance detection. And a rotation speed correction of a motor means for preventing uneven rotation while the sensor detection means is moving the pattern forming portion of the minute distance detection pattern means. Then, when the sensor detecting means moves a break in the pattern, which is a small moving distance of the fine distance detecting pattern means, the rotation speed correction of the motor means is interrupted, and the inertia function of the disk-shaped auxiliary member is stopped. By suppressing the rotation unevenness of the moving medium by the force, a large rotation deviation due to the interruption of the rotation speed correction is suppressed.
That is, in most cases, the moving speed of the moving medium is converged and corrected to the set moving speed value by the rotation speed correction of the motor means,
In addition, with respect to a small distance at which the rotation speed correction is interrupted, in order to suppress a rotation deviation due to a moderate inertia of the inertia function of the disc-shaped auxiliary member, a large set movement speed value is not disturbed. Since the convergence correction of the moving medium to the set speed value is performed again by the rotation speed correction that is taken over and restarted, the pitch unevenness of the image lines can be made inconspicuous.

[0006]

In order to achieve the above object, the invention according to the present application provides a moving medium having auxiliary member means integrated with the medium surface in the moving direction and moving together. The auxiliary member means has a set of a sensor detecting means for measuring the speed of the moving medium for each minute distance amount and a pattern means for detecting a minute distance. The micro-distance detection pattern means is composed of a pattern forming section that can detect the degree of movement of the micro-distance amount, and a pattern break that cannot be detected, and the sensor detecting means moves the pattern forming section. During the operation, the degree of movement for each minute distance is converted into an electric signal to generate a detection pulse signal. When there is a break position recognizing means for determining the cycle time of the detection pulse signal and recognizing the passage timing of the pattern break part, and when the break detecting means determines that the sensor detecting means is passing through the pattern forming part, , Based on the detection pulse signal,
A micro-distance moving speed determining means for comparing and determining the cycle time with a predetermined time or comparing with a periodic phase of a specific electric control signal of the recording device, and setting the motor in advance according to the comparison result; A motor rotation speed correction unit for correcting the rotation speed value of the moving medium, and converging and correcting the moving speed of the moving medium to a set moving speed value for each minute distance. On the other hand, if the sensor detecting means determines that the pattern is passing through the pattern break by the break position recognizing means, the contents of the result of the determination by the minute distance moving speed determining means are reset to a state instruction not to execute correction, and the motor rotation is reset. There is provided a correction suspending unit for suspending the correction execution by the speed correcting unit.

The auxiliary member means has a predetermined weight for giving an inertia to the moving motion of the moving medium, and the pattern interruption portion where the convergence correction for the moving speed of the moving medium for each minute distance is not executed. And a speed deviation suppressing means for suppressing the influence of the correction of the motor rotational speed during the suspension of the correction.

The interruption position recognizing means has a counting means for counting a predetermined cycle time, and when a pulse signal set as an input source is generated within the predetermined cycle time,
A watchdog timer function means is provided for resetting the count means to zero and executing a re-counting operation. Conversely, a watchdog timer function means for outputting a reset signal as soon as a pulse signal set as an input source is not generated even if the predetermined period of time is exceeded. Then, using the detection pulse signal as an input source, the break position recognizing means for recognizing the passage of the pattern break portion is constituted. As soon as the watch dock timer function means of the break position recognizing means determines that the pattern break is passing, a reset signal for stopping the operation of the minute distance movement speed determining means is issued. It is characterized by having a correction suspending means for instructing suspension of the execution of the motor rotation speed correction.

The interruption position recognizing means includes a second
Resetting which stops the operation of the minute distance moving speed determining means as soon as the second sensor detecting means recognizes the passage of the pattern break at the mounting position of the sensor detecting means. A correction interrupting means for issuing a signal and instructing to interrupt the execution of the motor rotation speed correction during the passage of the pattern break is provided.

That is, in the present invention, the break position recognizing means has a detection pulse signal generated by the sensor detecting means by the pattern forming section of the minute distance detecting pattern means. By configuring the generation cycle time as the input source of the watchdog timer function means, the watchdog timer function operates according to the state of the detection pulse signal interrupted when passing through the pattern interrupted section, and the reset signal is generated immediately. In this case, it is possible to recognize the passage of the pattern break, or simply provide an inexpensive second sensor detecting means so that the passage of the pattern break can be detected, and immediately reset the signal. To act to recognize the passage of the pattern break by operating to generate It operates to recognize the pattern discontinuity by having means. When the break position recognizing means recognizes that the sensor detecting means is passing through the pattern forming portion, the cycle time is compared with a predetermined time based on the detected pulse signal, or the recording device is used. The motor means is operated to compare and determine with the periodic phase of the specific electric control signal of the motor means, or to measure the cycle time of the detection pulse signal by any of the minute distance moving speed determining means, and set in advance according to the comparison result. By operating the motor rotation speed correction means to correct the rotation speed value of the moving medium, it acts to correct the moving speed of the moving medium to the set moving speed value for each minute distance amount.

Further, if the break position recognizing means recognizes that the sensor detecting means has started to pass through the pattern break, the break position recognizing means emits the light until the passage of the pattern break ends. The reset signal operates to set the determination result of the minute distance moving speed determination means to a state instruction in which correction is not forcibly executed. By doing so,
The operation of the motor rotation speed correction means acts to interrupt the correction.

On the other hand, the auxiliary member has a predetermined weight for giving an inertia to the movement of the moving medium irrespective of the operation of the motor rotation speed correcting means, and The moving medium also serves as speed deviation suppressing means that operates to reduce the speed deviation, and acts so that the moving speed of the moving medium becomes constant. Thus, the movement speed of the moving medium is stabilized by interrupting the execution of the motor rotation speed correction means due to the pattern break.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, embodiments of the present invention will be described. The place intended by the present invention is to control the rotation speed of the motor means for executing the movement of the moving medium,
When the sensor detecting means is moving the pattern forming section for generating the detection pulse signal by using the minute distance detecting pattern means provided on the auxiliary member means integrated on the moving medium surface, the detection pulse A motor rotation speed correcting means is provided which measures the speed of the auxiliary member for each minute moving distance based on the signal period amount and corrects the rotation speed of the motor means so that the moving speed converges to the set speed value. Also, when moving a pattern discontinuity formed by a small distance amount which is a joint of the minute distance detection pattern means provided on the auxiliary member means, the correction by the motor rotation speed correction means is required. The present invention is configured such that the movement speed deviation of the moving medium is suppressed by the inertia function of the auxiliary member. Thereby, the rotational speed of the motor means is corrected while moving the pattern forming unit, and the rotational speed deviation is suppressed by the inertia function for a short time while moving the pattern break, and the pattern forming unit is again moved. By controlling the rotation speed of the motor means during movement of the moving medium to converge the movement speed of the moving medium to the set speed value as a whole, it is possible to suppress the pitch unevenness of the image lines and reduce the cost. That is, the rotation speed control of the motor means having the simplified motor rotation speed correction means.

In the embodiment of the present invention, as a specific example, the convergence correction control of the rotational movement speed will be described in the case where the moving medium is a photosensitive drum in an electrophotographic apparatus. The present invention relates to rotation speed correction of a motor means of a moving medium for which the moving speed of the moving medium is desired to be uniformly converged to a constant speed, and is limited to an electrophotographic apparatus, a photosensitive drum, and the like described in the following embodiments. Not something. That is, the moving speed of a certain moving medium is constant, and
This is effective for all those that execute the rotation speed control of the motor means for realizing movement without speed unevenness. Furthermore,
The type of the minute distance detecting pattern means, the sensor detection, and the like, and the method of measuring and processing the minute moving distance / speed information are not similarly limited. Therefore, the motor rotation speed control device of the present invention, for example, in addition to the photosensitive drum,
It goes without saying that the present invention can be used for controlling the moving speed of the photoreceptor belt, the transfer drum and the transfer belt of the recording apparatus for forming a color image. Further, the present invention can be used not only for the electrophotographic apparatus but also for controlling the moving speed of the moving medium over a wide range, such as controlling the moving speed of the moving medium, which requires precision, and controlling the conveying speed of the image recording material.

On the other hand, in the present embodiment, the motor means is described as an example using a pulse motor.
As long as the motor means is capable of correcting the motor rotation speed with respect to the measured speed, the motor type and the motor rotation speed control means are not particularly limited.

Finally, in the configuration of the embodiment, the magnetic pattern is expressed in black and white for easy understanding.
The whole surface may be composed of a single color or may be colorless and transparent and printed directly on a medium. Further, in the case where the recording medium is directly formed on a colorless and transparent moving medium, for example, if a magnetic sensor or the like is provided in advance on a printing paper as a recording material and a magnetic sensor or the like is provided in a portion of a conveyance path serving as a point, the inclination of the recording material can be improved. There is also a usage method that can be applied to the purpose of control of print paper conveyance behavior other than conveyance speed correction control, such as direction conveyance detection, jam detection, and control of recording material positioning.

Next, an embodiment of the present invention will be specifically described. FIG. 1 shows a functional block diagram of the motor rotation speed control device of the present invention. In FIG. 1, reference numeral 1 denotes a photosensitive drum which is a moving medium, reference numeral 2 denotes a gear arrangement which is a motor power transmission means, and reference numeral 3 denotes a motor means for executing a rotation operation of the photosensitive drum 1. In this description, a pulse motor is used. ing.
15 is a motor driver IC for driving the pulse motor 3
It is.

Reference numeral 4 denotes a minute distance detecting pattern means, which shows an example in which a magnetic pattern is installed on the auxiliary member means.
It is composed of a pattern forming portion having a magnetic pattern and a pattern break portion having no magnetic pattern.

Reference numeral 5 denotes a sensor detecting means.
A magnetic sensor called an MR sensor, which detects a difference in the direction of the magnetic force lines of a pattern forming portion composed of a magnetic pattern alternately magnetized between an S pole and an N pole, and outputs a result for each change amount. The signal source converts the signal into a signal and emits the detection pulse signal in synchronization with a pair of magnetization cycles. Reference numeral 6 denotes an optical box unit, which is a unit that combines an optical scanning system that irradiates the photosensitive drum 1 with light by rotating a polygon mirror formed of a mirror surface with laser light that blinks in accordance with an image signal. A horizontal image synchronizing signal (hereinafter abbreviated as BD signal) is also provided for each position timing. The image signal is formed in the main scanning direction by synchronizing with the BD signal to execute writing and writing, and further, by repeating this image line, the image forming in the sub scanning direction is executed and one image is formed. It becomes.

Reference numeral 10 denotes a crystal oscillator (OSC: abbreviation for oscillator), which outputs a clock at a preset basic time period. Numeral 11 identifies a pattern break position based on a detection pulse signal periodically input by a break position recognition means.

Numeral 12 is a minute distance moving speed judging means for comparing and judging the speed deviation of the measured moving speed of the photosensitive drum 1 based on the period amount of the detection pulse signal and instructing by a set speed selecting signal. Or the interruption position recognition means 11
, The set speed selection signal is forcibly set to a specific value based on the instruction of the reset signal issued by the controller.

Numeral 13 denotes a motor rotation speed correction means for setting a cycle time of the motor excitation signal designated by the set speed selection signal in advance, a standard excitation data value, an early excitation data value,
The data value is selected from the delayed excitation data value and the corresponding data value is transferred to the motor excitation means 14. The motor excitation means 14 transmits an excitation signal to the motor driver IC 15 based on the transferred excitation cycle time data value.

In the case where the set speed selection signal is forcibly set to a specific value based on the instruction of the reset signal issued by the break position recognizing means 11, the specified data value is not particularly limited. In this case, a preset motor rotation speed (hereinafter, this value is referred to as a standard excitation data value) is designated.

That is, during the validity of the reset signal at which the rotation speed correction of the motor means 3 is interrupted, the motor rotation speed is set to the standard excitation data value in order to rely on the inertia function of the auxiliary member, and to stabilize the rotation speed. It is intended to make it.
Therefore, for example, in a device that operates only late,
Instead of indicating the standard excitation data value, the early excitation data value may be indicated. Further, in consideration of the stabilization of the rotation speed, the instruction may be such that the early excitation data value and the late excitation data value are alternately repeated.

On the other hand, in the present embodiment, when the reset signal is released, a phase comparison for comparing the period amount of each detection pulse signal with a predetermined time based on a clock generated by the OSC 10 is executed. Based on the speed deviation result of the detection pulse signal period amount, the setting speed selection signal is configured to output an instruction of an earlier value or a later value. The phase comparison of the period amount of each signal may be configured to compare the phase period with the BD signal when, for example, the generation period of the detection pulse signal is set for each line of the image. That is, the phase comparison of the detection pulse signal is performed not only in comparison with the set time, but also in comparison with the BD signal or the like which is a specific electric control signal of the recording apparatus according to the generation cycle configuration of the detection pulse signal. In other words, for the detection pulse signal for performing the speed measurement of the photosensitive drum 1, the measured period amount is faster than a preset reference value, It is only necessary to be able to determine whether it is late, and the reference value for the phase comparison is not particularly limited.

Here, a magnetic pattern configuration, which is a pattern for detecting a minute distance, which is a basic configuration of the present invention, will be briefly described. Although the magnetic pattern 4 in the embodiment is represented by an example where the magnetic pattern 4 is attached to the auxiliary member means, the magnetic pattern 4 may have an inertia function in the auxiliary member means and be directly attached on the surface of the photosensitive drum 1. Good, furthermore, in the magnetic sensor as the sensor detecting means 5, non-contact or contact may be used as long as it is adjacent to the magnetic pattern 4. On the other hand, the setting of the minute distance amount that the pattern forming unit has is equivalent to one image line distance or several line distances,
The present invention is not particularly limited to a configuration in which the amount of movement of the photosensitive drum 1 determined by the excitation of the motor 1 or the number of excitations of the number of motors is not particularly limited. It is the full length of the formation. In other words, the entire length of the pattern forming section formed in the moving direction of the photoconductor drum 1 is hardly equal to the circumference of the photoconductor drum 1 and a fraction is formed. In such a case, the pattern break portion becomes a predetermined value or a certain distance.

Hereinafter, the first embodiment will be described in detail with reference to FIGS. 2, 3, and 4. FIG. FIG. 2 is a circuit diagram showing details of the break position recognizing means 11 of FIG. 1 and a timing chart thereof. FIG. 3 is a circuit diagram showing details of the minute distance moving speed determining means 12, the motor rotational speed correcting means 13 and the motor exciting means 14, and FIG. 4 is a timing chart thereof.

As shown in FIG. 2, the break position recognition means 11 in the first embodiment is constructed by applying a watchdog timer function which is already used for a CPU or the like. . This watchdog timer function is used in a system configured with a CPU. A pulse signal generated at a preset time period from the CPU reloads the data value, and the counter circuit always counts. To keep you lying
When the pulse signal generated by the CPU is interrupted due to runaway of the CPU or the like, the counting is continued without reloading the data value of the counter circuit, and the operation of instructing the CPU to reset in the event of a count value overflow is forcibly performed. It is something to execute. In FIG. 2, the multi-stage counter circuit means 22 corresponding to the counter circuit of the watchdog timer function includes the sensor detecting means 5.
The count data value is reloaded with an output signal from the one-shot pulse circuit means 21 which synchronizes with the detection pulse signal generated by the circuit and outputs a one-shot pulse signal. Furthermore, the multi-stage counter circuit means 22
It is configured to execute a count operation based on the clock signal from the clock signal 10. As a result, the break position recognizing means 11 in the present embodiment operates as shown in the timing chart of FIG.

Until the generation of the detection pulse signal due to the break in the pattern is interrupted, the multi-stage counter circuit means 22 does not overflow the count value, and the data value is reset by the detection pulse signal without overflowing the count value. It is loaded and always keeps the count state.
On the other hand, in the section where the pattern is interrupted, the reception of the detection pulse signal is lost, so that the count data value of the multi-stage counter circuit means 22 is not reloaded and the count value overflows. As a result, the multi-stage counter circuit means 22 is fixed in a state of outputting a ripple carry-out signal (denoted as RCO in the figure), holds the count operation of the multi-stage counter circuit means 22, and issues a reset signal. It is configured as follows. In this hold state, the movement of the pattern break section is terminated and the reception of the detection pulse signal is resumed again, so that the multi-stage counter circuit means 22 counts and the reception of the detection pulse signal is resumed again. As a result, when the count data value of the multi-stage counter circuit means 22 is reloaded, the ripple carry-out signal is released, and the hold state is automatically released. As a result, the reset signal is also released, and the multi-stage counting circuit means 22 which has automatically recovered by periodic reloading again by the detection pulse signal always maintains the count state.

That is, the interruption position recognizing means 11 in this embodiment is constituted by a circuit to which a watchdog timer function is applied, and operates so as to output a reset signal when the detection pulse signal period is interrupted.

Next, description will be made with reference to the circuit diagram shown in FIG. Referring to FIG.
The multi-stage counter circuit unit 25 includes a one-shot pulse circuit unit 24, and a signal synchronized each time a detection pulse signal generated by the sensor detection unit 5 is received is configured as a load signal of the multi-stage counter circuit unit 25. Is configured to execute a counting operation based on a clock signal generated from the CPU, and by detecting a counting result with respect to the cycle timing of the load signal, the moving speed determination of the measured photosensitive drum 1 for each minute distance amount is performed. To do. That is, the generation timing of the load signal is a measurement cycle of the detection pulse signal generated for each minute distance amount of the photosensitive drum 1 actually moved, and the load count loaded to the multi-stage counter circuit means 25 by the load signal. The data value is a set target time value for moving the photosensitive drum 1 by a predetermined minute distance amount (hereinafter, this time amount is referred to as a detection pulse signal cycle setting time data value), so that the data value is multi-stage. The counter circuit means 25 detects whether the counting of the detection pulse signal period setting time data value is completed within the detection pulse signal period to be measured or not, thereby reducing the moving speed of the photosensitive drum 1 for each minute distance amount. It is possible to determine whether it is early or late. Specifically, if the multi-stage counter circuit 25 overflows within the load signal cycle when the detected pulse signal to be measured is generated, it can be determined that the movement is slower than the detected pulse signal cycle set time data value, and conversely, the counting is stopped. If no overflow occurs, it can be determined that the movement is fast. That is, the ripple carry-out signal of the multi-stage counter circuit means 25 (in the figure, RCO
It is written. ) Is output, the Q output of the D-type flip-flop (hereinafter abbreviated as DF / F) becomes high level, and is configured to output a slow movement judgment, and conversely, ripple carry out When no signal is output, the Q output of the D-type flip-flop becomes low level and outputs a fast movement determination. Further, the minute distance moving speed determination means 12 has a NAN at the last stage.
It has a decoding circuit means 27 constituted by a D circuit, and constitutes a motor rotation speed correction interruption means for judging based on a reset signal as a recognition result of the break position recognition means 11 and the above-mentioned speed judgment result. . This decoding circuit 27
With the output of the DF / F and the reset signal as input sources, when the reset signal is released, the speed determination result is output to the set speed selection signal to indicate the excitation time data value to be selected. On the other hand, when resetting is instructed, the standard time forcibly set in advance is set as the excitation time data value regardless of the speed determination result.

Then, the motor rotation speed correction means 13
In accordance with the content of the set speed selection signal instructed by the minute distance movement speed determination means 12, the excitation specified from the data value types of the early excitation data value, the late excitation data value, and the standard excitation data value prepared in advance. It has a data selector circuit means 30 for selecting a data value and transmitting it to the motor excitation means 14 at the next stage. The selected excitation data value is loaded into the multi-stage counter circuit means 32 of the motor excitation means 15 and transmitted to the motor driver IC 15 by the T-type flip-flop means 33, 34, 35 every time the count overflows. 3 is performed. Accordingly, the number of rotations of the motor means 3 may be either rapidly excited or lately excited according to the measurement result when the reset signal is released, corresponding to the excitation time selected by the data selector circuit means 30. When the correction is being performed and the reset is being performed, the correction suspension state in which the standard excitation is performed is maintained regardless of the measurement result. FIG. 4 is a timing chart showing an operation state of the above-described circuit.

As described above, in the first embodiment,
When it is determined by the break position recognizing means that it has passed the pattern break, a reset signal is issued, and the rotation speed correction of the motor means is forcibly interrupted irrespective of the measured moving speed of the photosensitive drum 1, and the set standard value is set. There is a correction interrupting unit that executes at the rotation speed, and during that time, the speed deviation is suppressed by the inertia function of the auxiliary member unit. On the other hand, when the movement of the pattern interruption portion is completed and starts to pass through the pattern formation portion, the reset signal at the interruption position recognition means is automatically released, and a detection pulse indicating the measured moving speed of the photosensitive drum 1 is released. The rotation speed of the motor means is corrected in accordance with the result of the minute distance moving speed determination means based on the signal, and the convergence correction of the moving speed of the photosensitive drum 1 to a predetermined speed which is always set allows the image to be converged. The movement speed deviation which causes pitch unevenness is suppressed.

In this embodiment, for the sake of simplicity of explanation, the pulse motor as the motor means 3 is provided with a torque required for moving the photosensitive drum 1.
This is described in the case of starting within self-startup. Therefore, when a pulse motor that cannot be started during self-starting is used, needless to say, drive control having slow-up or slow-down excitation is required.

Further, in this embodiment, the whole control is described by the configuration of the hardware circuit. However, a similar processing configuration may be realized by using software processing such as a CPU. It is not limited.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. The second embodiment is the same as the first embodiment described with reference to FIG. 1 except that there is a difference in the recognition means of the break position recognition means 11 and the configuration thereof. A description of the description will be omitted. Also, the same components as those in the first embodiment are represented by the same reference numerals and the description thereof is simplified.
Alternatively, it is omitted.

FIG. 5 is a functional block diagram of the motor rotation speed control device according to the second embodiment. Unlike the first embodiment, the auxiliary member means constituting the minute distance detection pattern means 4 is provided with a brim-like projection for shielding light at a pattern break section serving as a seam of the pattern forming portion. The photo-interrupter sensor means 7 (hereinafter simply referred to as an interrupter), which is another sensor detecting means, is provided to the sensor detecting means 5 only while passing through the pattern break. It is attached at a position where the light of the interrupter is blocked by the projections. As a result, the output of the interrupter 7 keeps the light-shielded state only from the start of the passage of the pattern break section to the end of the passage at the detection position of the sensor detection means 5, and otherwise, the light is not received. It is configured so that the state is maintained. The configuration of the other sensor detecting means 7 and the brim-shaped protrusion is not particularly limited, and the point is that the phase timing only during the passage of the pattern break at the detection position of the sensor detecting means 5 Any other sensor detecting means and its configuration that can detect the above may be used.

Then, the output state of the interrupter 7 is changed to the second
A reset signal which is input to the break position recognizing means 16 and a result corresponding to the detected state is used as an interruption period of the rotation speed correction of the motor as in the first embodiment will be described below. Is output.

FIG. 6 shows a detailed schematic diagram of the break position recognizing means 16 and a timing chart thereof in the second embodiment. The interruption position recognizing means 16 to which the interrupter 7 is connected always turns on the LED section through the resistor R1. Then, the phototransistor is received in a common emitter configuration and connected to the NOT circuit 28. As a result, the output state of the interrupter 7 is output from the NOT circuit 28 at the same timing, and a reset signal output at the same timing as in the first embodiment is configured.

Thus, the interruption position recognizing means 16 which is lower in cost than the interruption position recognizing means 11 described in the first embodiment is constituted. The NOT circuit 28
Although it is configured as a logical NOT circuit of signals, it is needless to say that an inverter circuit may be used according to the output logic of the sensor detecting means used.

[0041]

As described above, the minute moving distance of the photosensitive drum 1, which is a moving medium, is measured by the sensor detecting means 5 and the minute distance detecting pattern means 4 for each minute distance. By determining a speed deviation of the photosensitive drum 1 with respect to a preset set moving speed value,
Motor rotation speed correction means for correcting the rotation time of the motor means for controlling the rotation of the photosensitive drum 1 in accordance with the measured speed deviation condition for each excitation of the motor and correcting the convergence to the set movement speed value. In the motor rotation speed control device having the motor rotation speed correction means, the sensor detection means 5 can pass through the pattern forming section of the minute distance detection pattern means 4 and measure the speed deviation for each minute distance amount. And a correction interruption means for interrupting the execution of the correction by the motor rotation speed correction means during a period in which a pattern break serving as a seam of the pattern forming unit passes through the sensor detection means. On the other hand, the photosensitive drum has auxiliary member means which also has a rotary inertia function that does not increase the size of the photosensitive drum, and is configured so that the rotational speed deviation amount of the photosensitive drum can be suppressed as needed.

Thus, for a short period of time during which the correction is not executed by the motor rotation speed correction means, the correction inertia function of the auxiliary member means is used to suppress the movement speed deviation of the photosensitive drum while the correction execution is suspended. By making the moving speed of the photosensitive drum converge and correct to the set moving speed value during most of the period in which the correction is performed by the rotation speed correcting means, the color shift due to the pitch unevenness of the finally output image line is achieved. Using a plurality of sensor detection means and micro-distance detection pattern means, the image quality deterioration prevention means for making the deterioration of the formed image quality such as image line unevenness inconspicuous, compared with the means requiring complicated control means, Low cost by using a set of sensor detection means and micro-distance detection pattern means and adding an inertia function that does not increase the size further It there is an effect that can be achieved by forming a simple control configuration. Further, the configuration of the present invention also has an effect that, even in a low-cost full-color printing apparatus, it is advantageous in configuring a low-cost, compact, high-quality apparatus.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a motor rotation speed control device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of a break position recognizing means according to the first embodiment of the present invention, and a timing chart showing a specific operation thereof.

FIG. 3 is a circuit diagram showing a specific configuration of a minute distance moving speed determination unit, a moke rotation speed correction unit, and a motor excitation unit according to the first embodiment of the present invention.

FIG. 4 is a timing chart showing specific operations of a minute distance moving speed determination unit, a motor rotation speed correction unit, and a motor excitation unit according to the first embodiment of the present invention.

FIG. 5 is a functional block diagram illustrating a motor rotation speed control device according to a second embodiment of the present invention.

FIG. 6 is a circuit diagram showing a specific configuration of a break position recognizing means according to a second embodiment of the present invention, and a timing chart showing a specific operation thereof.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor drum 2 motor gear arrangement 3 pulse motor 4 minute distance detection pattern 5 sensor detection means 6 scanning optical box 7 photo interrupter 10 OSC 20 system reset circuit 21 one-shot pulse circuit 22 multi-stage counter circuit 24 one-shot pulse circuit 25 multi-stage counter Circuit 26 DF / F circuit 27 NAND circuit group 28 NOT circuit 30 Data value selector circuit 32 Multi-stage counter circuit 33, 34, 35 TF / F circuit

Claims (5)

[Claims] 1. A moving medium driven by a motor means of a recording apparatus, the moving medium having auxiliary member means integrated with a medium surface in a moving direction thereof and moving at the same speed, The auxiliary member means has a
The auxiliary member includes a minute distance detection pattern unit configured at intervals in units of a predetermined minute distance amount, and a sensor detection unit in an arbitrary vicinity of the minute distance detection pattern unit. The degree of change for each minute distance amount that can be detected with the movement of the means is converted into an electric signal to generate a detection pulse signal. The detection pulse signal generated by the sensor detection unit has a minute distance moving speed determination unit that compares or determines the period amount with a predetermined time amount, or compares the period amount with a period phase of a specific electric control signal included in the recording device, A motor rotation speed correction unit for correcting a preset rotation speed value of the motor unit based on the result, and setting the movement speed of the moving medium for each minute distance by the motor rotation speed correction unit; In the motor rotation speed control device for the motor means for correcting the convergence to a speed value, the minute distance detecting pattern means includes a pattern forming section capable of detecting a degree of change of the minute distance amount, and a changing state of the minute distance amount. The sensor detection means is configured to determine a period amount of a detection pulse signal generated by the sensor detection means. Having position recognition means interruption recognizing the passage timing of the turn discontinuity.
When the break position recognizing unit recognizes that the pattern break portion passes through the sensor detecting unit, the rotational speed correction of the motor unit is executed based on the determination result of the minute distance moving speed determining unit. In order to interrupt the correction operation by the motor rotation speed correction unit, the correction member has a correction interruption unit that resets the content of the determination result of the minute distance movement speed determination unit to a state instruction not to execute the correction. During the suspension of the correction of the motor rotation speed correction by the pattern interruption part, which has a predetermined weight that gives an inertia to the moving movement of the moving medium, and does not execute the convergence correction for the moving speed of the moving medium for each minute distance amount. A motor rotation speed control device characterized in that the motor rotation speed control device is configured to also have a speed deviation suppression means for suppressing the influence of the motor speed. 2. The interruption position recognizing means includes counting means for counting a predetermined period of time, and when a pulse signal set as an input source is generated within the range of the predetermined period of time, the counting means. And resets the clock signal when the pulse signal set as the input source is not generated even if the predetermined period of time is exceeded. The timer function means executes the operation using the detection pulse signal generated by the sensor detection means as an input source,
By constituting the interruption position recognizing means for recognizing the passage of the pattern interruption part, the reset signal output by the watchdog timer function means is configured as an operation reset of the minute distance moving speed determination means, 2. The motor rotation speed control device according to claim 1, further comprising a correction interruption unit that stops the execution operation of the minute distance movement speed unit and instructs execution of the motor rotation speed correction during the passage of the pattern break. . 3. The interruption position recognizing means has a second sensor detecting means provided separately, so that the passage of the pattern interruption portion at a position where the sensor detecting means is attached can be detected. When the second sensor detecting means recognizes the passage of the pattern break portion, a reset signal for stopping the execution of the operation of the minute distance moving speed determining means is generated, and the motor rotational speed correction is performed. 2. The motor rotation speed control device according to claim 1, further comprising a correction interruption unit that instructs execution of the motor. 4. The recording apparatus is an electrophotographic apparatus, and the moving medium corresponds to a photosensitive drum and a photosensitive belt in the electrophotographic apparatus, and the sensor detecting means is a magnetic sensor; 2. The motor rotation speed control device according to claim 1, wherein said minute distance detecting pattern means is constituted by a magnetic pattern magnetized by said minute distance amount corresponding to an integral multiple of an image one line distance amount. . 5. The motor rotation speed correction means of the motor means is effective for controlling the rotation speed of the motor means of the electrophotographic apparatus as the recording apparatus, and temporarily stores an image formed on the moving medium. The motor rotation speed for the motor rotation speed control for the moving medium included in the recording device, such as a predetermined movement speed control of a transfer medium for recording and holding, a predetermined movement speed control for conveying a recording material or the like output by the recording device, and the like. 5. The motor rotation speed control device according to claim 1, wherein the control device is a correction unit.