JPH05256860A - Rotation irreguarity measurement device - Google Patents

Abstract

PURPOSE:To measure rotation irregularity and determine a part which causes the rotation irregularity to occur specifically. CONSTITUTION:An encoder 3 is interlocked to an output axis of an equipment 1 which performs inspection and measurement. Based on a pulse signal which is output from the encoder 3, an operation processing means 5 where the pulse signal is input can specify presence or absence of rotation irregularity or the location of occurrence of the rotation irregularity by comparison with the pulse signal during normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation unevenness measuring device capable of measuring rotation unevenness in a plurality of gears driven by a motor.

[0002]

2. Description of the Related Art For example, there is known a transport mechanism including a motor and a reduction gear train that is rotated by a driving force of the motor for transferring various objects. In addition, in such a transport mechanism, there has been developed one that uses a gear or the like processed with high precision in order to transport a predetermined object extremely accurately and at a uniform speed.

[0003]

However, even if such a precision-machined gear is used, rotational unevenness may occur due to, for example, a slight misalignment occurring when the parts are assembled. In some cases, the transfer may not be performed at a uniform speed.

Therefore, there is a strong demand for the development of an apparatus capable of inspecting and confirming the rotation irregularity in such a mechanism to find a defective product and easily identifying the defective portion. . The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotation unevenness measuring device capable of measuring rotation unevenness and surely identifying the cause thereof.

[0005]

That is, the present invention is a rotation unevenness measuring device for measuring and detecting rotation unevenness of a plurality of gears of a device to be measured which is rotated by a driving force of a motor, wherein An encoder that outputs a pulse signal according to the amount of rotation of a rotating body that is connected to the rotating shaft of the gear of the stage,
A braking means for applying a predetermined load to the rotating operation of the rotating body, and an arithmetic processing means for inputting a pulse signal output from the encoder and performing a predetermined waveform analysis processing based on the pulse signal. Is.

[0006]

According to the rotation unevenness measuring apparatus of the present invention, the encoder is connected to the output shaft of the device for inspecting / measuring, and when the device is actually operated, the pulse signal is output from the encoder. The arithmetic processing means to which the signal is input can identify the presence or absence of the rotation irregularity and the location where the rotation irregularity occurs by comparing the data with the pulse signal when operating normally.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a rotation unevenness measuring device according to the present invention.
Encoder 3 connected to output gear 2 of device under test 1
And a braking means 4 and an arithmetic processing means 5. In the present embodiment, the device under test 1 is composed of a motor 6 and a reduction gear train 7 in which a plurality of gears including an output gear 2 are combined, and is a drive means of a paper feed drum of a laser beam printer (LBP). The mechanism is being used. This drive mechanism ensures good image quality because uneven rotation of gears causes unevenness in the paper feed speed during conveyance, resulting in unevenness in printed images. Therefore, it is designed to confirm and measure the presence or absence of uneven rotation.

The encoder 3 takes over the rotational force from the output gear 2 as it is and reproduces the operation of the output gear 2 in a greatly expanded state. At the same time, the operating state is optically detected and a pulse is generated according to the state. This embodiment outputs a signal, and in this embodiment, a large-diameter disk-shaped rotating body 9 (see FIG. 2) that rotates by transmitting its rotational force via an input gear 8 that meshes with the output gear 2, A light emitting diode (not shown) that emits light toward a mark 9a that is accurately engraved on the peripheral edge of the rotating body 9 at predetermined intervals, and light that is emitted from this light emitting diode and reflected when a portion other than the mark 9a passes through. When it is incident on the optical sensor 10, the optical sensor 10 outputs a predetermined pulse signal.

The braking means 4 is used when the device under test 1 is inspected.
When the device under test 1 is actually used, the same load as the braking force applied from the other is applied, in other words, the operation is reproduced under exactly the same conditions as when actually used, It is connected to the encoder 3. A powder brake that uses a magnetic powder to generate a braking force by an electromagnetic force is used as the braking means 4 in this embodiment. The arithmetic processing means 5 receives the pulse signal output from the encoder 4, performs a predetermined waveform analysis process on the basis of the pulse signal, and detects the presence / absence of rotation unevenness and further detects a portion where the rotation unevenness occurs. A microprocessor is used. That is, this arithmetic processing means 5
Is a comparison of the data of the pulse signal or the like input by the normal device under test and the data of the pulse signal or the like input from the device under measurement 1 being measured,
After comparing and examining the phase difference between these two, whether or not the phase is normal, that is, the presence or absence of rotation unevenness and the occurrence cause portion are detected when the rotation unevenness occurs.

That is, as shown in FIG. 3, if there is an abnormality in a part 11a of a certain gear 11, for example, when measurement is started from a start point S, a signal of one pulse per cycle as shown in FIG. Based on A, a pulse reference signal B by a normal device under test within this one cycle, and a pulse actual measurement signal C by an abnormal device under test, that is, reference signal B−actual signal C = phase difference D is detected. By doing so, it can be understood that there is an abnormality in the portion of the angle θ from the start position S, that is, 11a. Further, by further performing arithmetic processing, it is possible to detect a periodic abnormality.

[0011]

As described above, according to the rotation unevenness measuring apparatus of the present invention, the arithmetic processing in which the pulse signal output from the encoder is input via the encoder connected to the output shaft of the device under test. Means to compare with data such as pulse signals input from a normal device under test.
Since it is possible to examine and measure the presence or absence of uneven rotation of the device under test, it is possible to judge the quality of the product before assembling the device under test to a predetermined device, for example, and to improve reliability. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a rotation unevenness measuring apparatus according to the present invention.

FIG. 2 is a plan view showing an encoder of the rotation unevenness measuring device shown in FIG.

FIG. 3 is an explanatory view showing the operation of the present invention.

FIG. 4 is a time chart diagram for explaining the operation of the present invention.

[Explanation of symbols]

 6 motor 1 device under test (driving mechanism) 2 output gear 9 rotating body 3 encoder 4 braking means 5 arithmetic processing means

Claims (1)

[Claims] 1. A rotation unevenness measuring device for measuring and detecting rotation unevenness of a plurality of gears of a device under test which is rotated by a driving force of a motor, the rotation unevenness measuring device being connected to a rotary shaft of a final gear of the gears. An encoder that outputs a pulse signal according to the amount of rotation of the body, a braking unit that applies a predetermined load to the rotating operation of the rotating body, and a pulse signal that is output by the encoder are input.
A rotation unevenness measuring apparatus comprising a calculation processing unit for detecting a phase difference between the pulse signal and a reference pulse, performing a predetermined waveform analysis process, and finding an abnormal position.