JPH0297297A - Detector for abnormality of drive system - Google Patents

Abstract

PURPOSE:To detect the abnormality of revolution in a very short time, and to stop a stepping motor by arranging the revolution-quantity detecting section of the motor, a reference pulse output section, a reference-value detecting section and a comparison section and detecting difference of a specified value or more between the quantity of rotation and a reference value. CONSTITUTION:The revolution-quantity detecting section 2 of a stepping motor 1, a reference pulse output section 3 and a reference-value detecting section 6 are mounted. Difference of a specified value or more between the quantity of rotation and a reference value is detected by a comparison section 4, thus detecting the abnormality of revolution in a very short time, then stopping and controlling the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an abnormality detection device for a drive system using a stepping motor.

[Conventional technology]

Conventionally, drive systems using stepping motors have been used in facsimile machines, printers, etc. to transport and feed documents, recording paper, etc., but abnormalities in this drive system,
In other words, if the motor's load fluctuation range exceeds the motor's torque range due to a paper jam, etc., and an abnormal situation such as step-out occurs, conventional timing switches for transporting documents, paper feeding, etc. are used to detect this. This abnormal situation was detected from the difference between the opening/closing status of the document ejection timing switch or the near-end switch and the elapsed time.

Further, for example, in a copying machine, a motor is used in an optical system and a paper conveyance system, and various control means are taken to control the speed and drive of the machine in order to maintain the quality of the machine. That is, means for stabilizing the speed of the drive motor at a predetermined speed (Japanese Patent Application Laid-open Nos. 57-27277, 60-8831, 1986-85086), and methods to prevent scanning abnormalities in the optical system. means for detecting an abnormality in the current flowing through the drive motor of the optical system and controlling the motor to stop; means detecting an abnormal rotation of the take-up reel of the ink donor film and controlling the recording operation to stop; Japanese Patent Application Laid-Open No. 60-24 proposes a means for detecting an abnormality in an encoder connected to a driving motor of an optical system.
9131, JP 61-59323, Utility Model 62-60346, JP 63-110467
Publication No.).

[Problem to be solved by the invention]

However, since it takes a certain amount of time to detect an abnormality in the drive system caused by a jam or the like, it is impossible to avoid motor adjustment during that time and the generation of vibration and noise associated with it.

Further, there was a problem that the originals and paper were damaged.

Although a method of controlling the drive motor as in the case of copying machines is conceivable, there is no evidence of how to quickly and accurately detect an abnormal situation for a stepping motor that is driven intermittently. It has not been.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a drive system abnormality detection device that detects rotation abnormalities in a stepping motor used in a drive system of a facsimile machine, etc. in a minute time and controls the stepping motor to stop. shall be.

[Failure to solve the problem]

In order to achieve the above object, the present invention provides an abnormality detection device for a drive system using a stepping motor, which includes a rotation amount detection unit that measures the rotation amount of the stepping motor, and a reference rotation input to the stepping motor. A reference pulse output section that outputs a pulse, a reference value detection section that measures a soil reference rotation pulse and detects a reference value, and a reference pulse output section that outputs a pulse.
and a motor control means for stopping the stepping motor when the comparison section causes a difference of more than a predetermined value between the soil rotation suspension and the reference value. It is something.

[Effect]

According to the abnormality detection device configured as described above, the amount of rotation of the stepping motor is measured, this amount of rotation is compared with a reference value obtained from the reference rotation pulse of the stepping motor, and the difference between these is determined to be greater than or equal to a predetermined value. Stop the stepping motor when

〔Example〕

FIG. 1 is a block diagram of an abnormality detection device according to the present invention.

This device is composed of a stepping motor, a rotation amount detection section 2, a reference clock generation section 3, a comparison section 4, a counter 5.6, a motor drive control section 7, a motor drive section 8, a central control section 9, and a drive transmission section 10. Ru.

The stepping motor rotates at a speed corresponding to the output pulse signal from the motor drive section 8, and uses this rotational force to convey and feed a document or recording paper (not shown) via the drive transmission section 10. Further, the stepping motor rotates the slider 1 to the disk 24, which will be described later. As shown in FIG. 2, the rotation amount detection unit 2 includes a slit disk 24 in which a plurality of slits 1 to 25 are formed at equal intervals in the circumferential direction, and a light emitting device arranged to face each other via the slits 1 to 25. It is composed of a photointerrupter 23 consisting of an element 21 and a light receiving element 22.

When the slit disk 24 is rotated, the slit 2 crosses between the light emitting element 21 and the light receiving element 22.
A pulse signal corresponding to the number of photointerrupters 23
I am trying to output it from .

The reference clock generator 3 generates a reference pulse for rotating the stepping motor, and the central clock generator 3
The reference pulse is output at a constant frequency while the motor drive signal is being output from the motor drive signal.

The counter 5 counts the output signals from the photointerrupter 23 and outputs the values from 1 to 1.
The reference clock generator 3 counts the reference clock pulses from the reference clock generator 3 and outputs a count value. The counters 5 and 6 are reset by a reset signal output from the central control unit 9 every time a predetermined number of pulses are output from the reference clock generation unit 3. The presence or absence of rotational abnormality is detected at a predetermined pulse interval of 0, and the output pulse from the photointerrupter 23 and the reference pulse are, for example, the same number of pulses C in the case of 1-rich operation. The 3° comparator 4, which is configured to output each force, compares the force unl~value input from the non'j5.
When the difference between the value and the count value of the mentor 6 is set in advance and becomes less than fKi, an interrupt signal is manually sent to the central control unit S). The above set value is, for example, the difference between the count of the counter 5 when the stepping motor 1 almost stops rotating (the difference between the count of the counter 5 and the count of the counter 6 at that time). .

The central control section 9 outputs a reference pulse No. 111 from the reference rack section 3 and outputs a motor drive signal to the Tanabata drive control section 7, and also receives an interrupt signal from the comparison section 4. When this happens, a motor stop signal is output to the motor drive control section 7. Roughly speaking, when the central control section 9 outputs a motor stop signal, it simultaneously causes an alarm means (not shown) to output an alarm signal, thereby notifying the operation of the stepping motor 1. That's what I do.

When the motor drive signal is input from the central control unit 9, the motor drive control unit 7 outputs a reference clock pulse signal from the part 3 to the motor drive unit 8, while the motor stop signal is input to the motor drive unit 8. The motor drive section 8
This is to stop the output of the L-1 pulse swim from the reference point. The motor drive unit 8 rotates the stepping motor 1 at a speed corresponding to the frequency of the reference clock pulse signal when it is input from the one-unit drive control unit 7.

The drive transmission section 10 is composed of a drive means such as a gear or a gear, and when driven to rotate by the stepping motor 1, conveys and feeds the original and the recording paper.

Next, the operation of the above configuration will be explained.

First, in a normal state, the stepping motor 1 is rotated by an amount of rotation corresponding to the frequency of the reference clock pulse from the reference clock generator 3. Then, the J' runt value corresponding to the rotational speed of the stepping motor and the run 1 - (direct) corresponding to the reference pulse are outputted from the counter 5°0 and compared by the comparator 4. In this normal state, there is almost no difference between the values of the two columns 1, so no interrupt signal is output from the comparator 4, so the stepping motor continues to rotate, and the original and recording paper The paper transport and paper feeding operations are performed normally.

- On the other hand, if a jam occurs in the original during mud transport or paper feeding, the stepping motor will be overloaded due to the jam and will almost never be able to rotate. Then, the pulse signal is no longer output from the Al~interrupter 23, and the count value by the counter 5 becomes an extremely small value. Therefore, the count value of the counter 5 differs from the count value of the counter 6 by more than a preset value, and as a result, the comparator 4 outputs an interrupt signal and the rotation of the slurping motor is stopped. At the same time, an alarm signal is output.

In addition, when conveying documents, etc. using a step angle of 7.5° and a relatively large stepping motor, the number of output pulses from the photo interrupter 23 and the number of reference tarok pulses should be set to be equal, for example. Therefore, the slit interval of the slit disk can be increased in accordance with the step angle, and even if an inexpensive photointerrupter with low frequency response is used, highly accurate stopping control of the stepping motor can be performed.

Furthermore, in the above embodiments, a drive system for transporting a document and recording paper has been described in detail, but a drive system for moving an optical system for reading a document can also be implemented.

〔Effect of the invention〕

In the present invention, the rotation amount of the stepping motor is converted into pulses by the rotation amount detection section and counted, and the reference clock pulses are extracted from the rack raw section and counted. An abnormality can be detected with a simple configuration including a rotation amount detection section, a counter, and a comparison section. Further, since the rotation amount of the stepping motor is directly detected by the rotation pulse detection section, an abnormality can be detected in a minute time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram for explaining the configuration of a rotation amount detection section. 1...Stepping motor, 2...Rotation amount detection section,
3... Reference I cock generation part, 4... Comparison part, 7.
...Motor drive control section, 8...Motor drive section, 9...
Central control unit. Patent applicant: Representative of Sanda Kogyo Co., Ltd. Patent attorney: Etsushi Kotani
Patent Attorney Chief 1) Front view Patent Attorney Takao Ito

Claims (1)

[Claims] 1. An abnormality detection device for a drive system using a stepping motor includes a rotation amount detection section that measures the rotation amount of the stepping motor, a reference pulse output section that outputs a reference rotation pulse input to the stepping motor, and a reference pulse output section that outputs a reference rotation pulse input to the stepping motor. a reference value detection section that measures pulses and detects a reference value; a comparison section that compares the amount of rotation with the reference value; and a comparison section that detects a difference between the amount of rotation and the reference value by a predetermined value or more. and motor control means for stopping the stepping motor when an abnormality occurs.