JPH0527844A - Method and device for matching mismatched position of rotor - Google Patents

Abstract

PURPOSE:To automatically turn a rotor, etc., by a prescribed angle to set a detected mismatched part at a fixed position after the position of the mismatched part defined on the basis of a measurement start point is specified based on the data detected by a vibration sensor and a measurement start point sensor and a rotary part including the rotor stands still with discontinuation of the operation of a drive motor for a laser beam scanner motor, etc. CONSTITUTION:The vibration of a setting stage 1 holding a revolving rotor W is detected B and at the same time a measurement start point 13 of a rotary part including the rotor W is detected 18. Based on these detection data, the position of a mismatched part where the vibration is caused is converted into a rotational angle difference produced on the basis of the point 13. Then the rotor W is revolved by a prescribed angle based on the rotational, angle difference so that the mismatched part stops at a fixed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant positioning of a non-aligned position of a rotor, which has been developed for improving the efficiency or automation of the work of adjusting the dynamic balance of the rotor in the assembly and manufacturing process of a laser beam scanner motor or the like. A method and an apparatus thereof.

[0002]

2. Description of the Related Art Rotating bodies that rotate at high speed often generate vibrations when they are not balanced in motion, which adversely affects the apparatus including the rotating bodies. Among these rotating devices, particularly in the case of a laser beam scanner motor, the surface finish accuracy of the mirror surface that reflects the laser beam, which is the heart of the rotating machine, and the dimensional processing accuracy of the rotating body including these are strictly required, and they are rotated. At the same time, it is required that the core run out at the same time as it can exhibit the same performance. Therefore, in the assembly manufacturing process of these rotating bodies,
Be sure to adjust the dynamic balance of the rotating body.

A conventional work of adjusting the dynamic balance of the rotating body will be described with reference to FIGS. 6 and 7.
A vibration sensor 101 is fixedly attached to the motor set base 100, and the vibration detection signal is input to the balancer 102. On the other hand, the measurement origin detection sensor 103 is
With the laser beam scanner motor 104 fixed to 100, a rotating body 105 such as a mirror is fixedly set at a position where a measurement starting point mark 107 attached to a rotary flange portion 106 mounted coaxially can be detected. In the figure, 108
Is a rotating shaft.

In this state, the laser beam scanner motor
When the 104 is driven, the vibration sensor 101 detects the vibration generated by the rotating part including the rotating body 105 and the rotating flange part 106 and transmits it to the balancer 102, and the signal is transmitted to the balancer 102.
Internally, it is converted into an unbalanced (mismatched) amount of the rotating portion by arithmetic processing and displayed. On the other hand, the measurement start point mark 107 is detected by the measurement start point detection sensor 103 and transmitted as a pulse signal to the balancer 102, and the position of the mismatched portion is displayed on the balancer 102 as an angle based on the measurement start point mark 107. .

Since the misalignment amount and the misalignment position are measured on these displays, the operation of the laser beam scanner motor is stopped, and an appropriate amount of weight is attached to the misalignment position of the rotating portion according to the displayed data. On the contrary, an appropriate amount is scraped off to adjust the dynamic balance, and when the dynamic balance cannot be achieved by one operation, the above procedure is repeated.

However, the misaligned positions of the rotating body 105 and the rotating flange portion 106 of the laser beam scanner motor which has been stopped do not determine at which position of 360 degrees the stationary state is achieved. Therefore, it is the current situation that the unbalanced position is read by using the measurement starting point mark 107 as a mark and the dynamic balance adjustment work is performed. This misalignment position reading work is quite difficult in practice because it is a simple work, that is, there is a misreading of the misalignment position angle displayed on the balancer 102, or the measurement starting point mark 107 is used as a mark. However, there is a problem that the wrong position is often specified when the misalignment position is specified. Therefore, it has been a bottleneck for improving the efficiency or automation of the dynamic balance adjustment work.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problem that an unmatched portion based on the measurement starting point is based on the data detected by the vibration sensor and the measurement starting point detecting sensor. After the drive motor such as the laser beam scanner motor is stopped and the rotating part including the rotating body comes to rest, the detected misalignment part is automatically placed in a fixed position. The object of the present invention is to provide a method and a device for constant positioning of a misaligned position of a rotating body capable of rotating a rotating body by a predetermined angle.

[0008]

In order to solve the above-mentioned problems, the present invention detects the vibration of a set table for rotating and holding a rotating body and, at the same time, detects the measurement starting point of a rotating portion including the rotating body, The position of the unmatched portion that generates vibration is converted from both detection data into a rotation angle difference based on the measurement starting point, and the rotating body is rotated at a predetermined angle based on the rotation angle difference so that the unmatched portion stops at a fixed position. We have established a constant positioning method for the misaligned position of the rotating body that is only rotated.

[0009] Further, a rotation drive means in which a rotor is coaxially mounted on a drive rotor which is rotated by a drive motor fixed to the set table, and a vibration sensor which is fixed to the set table and detects vibration of the rotor. And a measurement starting point detection sensor that detects the measurement starting point mark attached to the drive rotor, inputs the signals from both sensors to the balancer, and generates the vibration between the position of the unmatched portion of the rotating body and the measurement starting point. Detecting means for generating a control signal according to the difference in rotation angle, and a positioning rotor that is driven to rotate by a pulse motor and is detachable from the driving rotor, and the facing position of both rotors. The pair of N poles and S poles provided in the above is removable, and after setting the initial state in which the N pole and the S pole of the positioning rotor are in fixed positions, the balancer is connected to the drive motor to form the balancer. A pulse motor is driven based on a control signal output from the rotor to rotate the rotating body through a driving rotor by a predetermined angle, and the unmatched portion is stopped at a fixed position. A constant positioning device for misaligned position was constructed.

[0008]

According to the method and the apparatus for constant positioning of the non-aligned position of the rotating body of the present invention having the above contents, the mirror is fixed to the mounting flange by the drive rotor rotated by the drive motor fixed to the set base. When a rotating body of a structure such as that described above is coaxially mounted and rotated at a constant rotation speed, if the dynamic balance of the rotating body is not balanced, the rotating body will cause core runout and its vibration will be driven. Through the motor and the set stand,
It is detected by the vibration sensor fixed to the set table, the signal is input to the balancer, while the measurement starting point mark attached to the drive rotor is detected by the measurement starting point detection sensor, and the signal is input to the balancer for vibration and measurement. Both signals of the starting point are arithmetically processed inside the balancer to generate the position of the unmatched portion based on the measurement starting point as a control signal according to the rotation angle difference.

Then, after the orientation of the positioning rotor is set to the initial state such that the N pole and the S pole provided therein are in the fixed positions, the positioning rotor is brought close to the driving rotor. The drive rotor is rotated by its magnetic force so that the S pole and the N pole of the drive rotor face each other, and finally the N pole and the S pole of both rotors are magnetically attached and connected. In this state, the drive rotor is set to the initial position by the positioning rotor, and from this state, the control signal is input to the pulse motor to rotate the rotor by a predetermined angle based on the control signal. The predetermined angle is automatically determined in consideration of the known initial position of the drive rotor, the angular deviation of the measurement starting point mark, and the position at which the unaligned portion is desired to be stopped. It is for stopping on location.

[0010]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. The present invention, based on the measured data of the misaligned portion of the rotating body, ensures that the position of the misaligned portion is automatically always constant after the laser beam scanner motor is stopped and the rotating body is stopped. It is a thing. FIG. 1 shows a typical embodiment of the present invention, in which A is a rotation driving means, B is a detecting means, and C is a positioning means. Further, what is shown by W in the drawing is a rotating body composed of a mirror for reflecting the laser beam and its mounting flange.

The rotation driving means A realizes the drive motor 2 fixed to the set table 1, the drive rotor 3 rotated by the drive motor 2, and the coaxial rotation of the drive motor 2 and the drive rotor 3. , A shaft 4 for mounting the rotating body W on the drive rotor 3 coaxially.

The set base 1 is formed by arranging a base plate 5 and an upper plate 6 so as to face each other vertically with a space therebetween, and to connect them to each other with a plurality of connecting rods 7, ....
The lower end of the shaft 4 arranged vertically is fixed to the base plate 5, and the upper portion of the shaft 4 penetrates upward from a guide hole 8 formed in the upper plate 6 in a circular shape, and the guide hole 8 of the drive motor 2 is inserted. The drive motor 2 is fixed to the upper surface of the upper plate 6 so that the rotation hole 9 corresponds, and the center hole 10 of the drive rotor 3 is rotatably inserted into the shaft 4 and the drive rotor 3 of the drive rotor 3 is rotated. The central portion is rotatably inserted into the guide hole 8 and fixed to the rotary hole 9 of the drive motor 2, so that the drive rotor 3 is rotated coaxially by the rotation of the drive motor 2. Here, when the drive motor 2 is not energized, the drive motor 2 is freely rotatable. The fixed flange 11 of the drive rotor 3 on which the rotating body W is mounted is positioned above the drive motor 2, and the upper end of the shaft 4 projects from the fixed flange 11. Further, at the lower end of the drive rotor 3, as shown in FIG.
A ring magnet 12 as shown in FIG. 3 is coaxially fixed, and the ring magnet 12 is magnetized so that the N pole and the S pole are magnetized at opposite positions centering on the axis. A measurement starting point mark 13 is provided at one place around the fixed flange 11 of the drive rotor 3.

In this embodiment, the rotating body W mounted on the drive rotor 3 is formed by coaxially fixing a polygon mirror 14 for a laser beam scanner and a mounting flange 15 for holding the polygon mirror 14, and its center is shown. The shaft hole 16 provided in the above is fitted into the upper end portion of the shaft 4 and detachably attached to the fixed flange 11 of the drive rotor 3 by appropriate fixing means. As the rotating body W, various ones are adopted, and the fixing means is appropriately selected such as a screw stopper in accordance therewith.

The detecting means B is a vibration sensor 17 which is fixed at a proper position on the setting table 1, a measurement starting point detecting sensor 18 which detects the measurement starting point mark 13, and a signal for transmitting these signals to perform arithmetic processing to perform measurement. It is composed of a balancer 19 which displays the angle of the position of the unmatched portion with respect to the starting point and the measured value of the unbalance amount, and generates a control signal.
In the present embodiment, the vibration sensor 17 is fixed to the upper plate 6 of the set table 1, and the measurement starting point detection sensor 18 is arranged in a non-contact state at a position facing the measurement starting point mark 13. Here, the measurement starting point detection sensor 18 is preferably an optical detection sensor utilizing reflection of laser light.

Next, an example of signal processing by the detecting means B is shown in FIG. The upper signal is a vibration waveform detected by the vibration sensor 17, which is actually a complicated one in which fine vibration elements are superposed, but is simply displayed as a sine wave. The peak position of this waveform corresponds to the unmatched portion of the rotating body W, and in this embodiment, the negative peak position appears due to the lack of the mass of the portion that should be originally uniform. The amount of unbalance) corresponds to the absolute value of the amplitude. The lower signal is the pulse signal of the measurement starting point mark 13 detected by the measurement starting point detecting sensor 18, and the period τ of this pulse is the driving rotor 3
Alternatively, it is a time required for the rotating body W to make one rotation, and when the rotating body W is rotating at a constant rotation speed, the period τ has a constant value. Then, first, the balancer 19 monitors the period τ, data is skipped until this value becomes constant, and when the period becomes constant, the period τ is stored in the internal memory and the vibration waveform by the vibration sensor 17 is also stored. To do. Then, the time T to the negative peak position of the vibration waveform immediately after that and the absolute value of the peak are calculated with the generation time of the pulse by the measurement starting point mark 13 as the starting point. Based on these data, the rotation angle difference θ (= 360 × T / τ (degrees)) is displayed for the position of the unmatched portion based on the measurement starting point, the unbalance amount is displayed, and the rotation angle difference θ A control signal proportional to is generated.

The positioning means C comprises a moving mechanism 20 for connecting to the drive rotor 3 and a rotating mechanism 21 for rotating the moving mechanism 20 by a predetermined angle.

The moving mechanism 20 fixes the air cylinder 22 to the lower surface of the base plate 5 of the set base 1, and projects the cylinder rod 23 upward,
The movable plate 24 is configured so that the center of the movable plate 24 is fixed to the tip of the movable plate 24, and the movable plate 24 moves up and down in parallel according to the appearance and withdrawal of the cylinder rod 23.

The rotating mechanism 21 has a positioning rotor 25 rotatably mounted on one side of the movable plate 24 and a pulse motor 26 fixed on the other side.
A timing belt 29 is stretched between a timing pulley 27 fixed to the rotary shaft of 26 and a timing pulley 28 fixed to the positioning rotor 25, and the rotation of the pulse motor 26 is transmitted to the positioning rotor 25 and further The center hole 30 of the rotor 25 is vertically movably inserted through the shaft 4 and guided, and a pair of N and S poles similar to the ring magnet 12 are magnetized and formed on the upper end of the positioning rotor 25. The ring magnet 31 is coaxially fixed and configured. Here, the pulse motor 26 cannot rotate unless a signal for controlling its rotation is input.

Further, stopper rings 32 and 33 for restricting the downward movement of the driving rotor 3 and the downward movement of the positioning rotor 25 are provided at appropriate positions on the shaft 4, respectively. When the positioning rotor 25 is in contact with the stopper ring 33, that is, in the lowermost position, the ring magnets 12 and 31 are set to have a sufficient distance. The drive rotor 3 can rotate regardless of the position.
Further, the pulse motor 26 receives a control signal from the balancer 19 and rotates by a constant angle corresponding to the number of pulses by a pulse signal generated from the control device 34 based on the signal. In general, the rotation angle per pulse of the pulse motor 26 is not an integer angle. Therefore,
By the timing pulleys 27 and 28, conversion is performed so that one pulse rotates an integer angle, and for example, one pulse is adjusted to obtain a rotation angle of 1 degree or 10 pulses to obtain a rotation angle of 1 degree.

Therefore, when the drive motor 2 is driven to rotate the drive rotor 3 in a state where the positioning rotor 25 is located at the lowermost position as shown in FIG. 1, the rotating body W mounted on the drive rotor 2 is rotated. When the dynamic balance is not achieved, a core runout causes vibration, and the vibration is detected by the vibration sensor 17 via the drive rotor 3 and the set base 1, and at the same time, the measurement provided on the drive rotor 3 is performed. The starting point mark 13 is detected by the measurement starting point detection sensor 18, both signals are transmitted to the balancer 19, and the arithmetic processing is performed as described above, and the position of the unmatched portion based on the measurement starting point is displayed as the rotation angle difference θ. ,
Displays the unbalance amount.

Then, after the driving motor 2 is stopped and the driving rotor 3 and the rotating body W are made to stand still, the N-pole and S-pole positions of the ring magnet 31 are set to the initial positions, and the The cylinder 22 is operated to move the cylinder rod 23 upward, and the ring magnet 31 and the ring magnet 12 fixed to the drive rotor 3 are brought close to each other. As the two ring magnets 12 and 31 approach each other, the repulsive force of the same pole and the attractive force of the different poles are strengthened, and eventually the N pole (S pole) of the ring magnet 12 and the S pole (N pole) of the ring magnet 31 are separated. The drive rotors 3 rotate automatically so that they coincide, and finally they are magnetically coupled to each other. That is, the rotation driving means A is initialized in response to the initialization of the positioning means C.

When the rotation driving means A is initialized,
The position of the measurement starting point mark 13 is uniquely determined with respect to the set table 1, and when the control signal output from the balancer 19 in that state is input to the pulse motor 26 as a pulse signal through the control device 34, the pulse According to the number, the pulse motor 26 rotates by a predetermined angle, which is transmitted to the positioning rotor 25 via the timing belt 29, and the driving rotor 3 and the rotating body W rotate by a desired angle. Here, the position of the unmatched portion of the rotating body W is rotated so as to be a desired position with respect to the setting table 1, but the predetermined angle to be rotated does not always match the rotation angle difference θ, and θ ± α.
(Degree). This deviation α is appropriately selected so that the unmatched portion of the rotating body W stops at a desired position with respect to the setting table 1, and is increased / decreased in the balancer 19 to obtain a control signal (θ ±).
α) is generated or a control signal (θ) generated from the balancer 19 is increased / decreased in the control device 34 to be converted into a desired pulse signal (θ ± α), and then input to the pulse motor 26.

In this way, the unaligned portion of the rotating body W automatically stops at a constant desired position with respect to the setting table 1.
Then, in the work of adjusting the dynamic balance of the rotating body W, in this stopped state, the weight of the adhesive or the like corresponding to the unbalance amount is bonded to the mounting flange 15 corresponding to the unmatched portion. The application of the adhesive may be manual, but it can also be automated. When the position of the unmatched portion is caught as an excessive mass portion, the unmatched portion is cut.

Thereafter, the air cylinder 22 is operated to operate the ring magnet 12 of the drive rotor 3 and the positioning rotor 25.
The ring magnet 31 is disconnected and the drive motor 2 is operated again to detect whether the dynamic balance has been corrected. In this detection, if the vibration signal by the vibration sensor 17 is below a certain level, it is determined that the dynamic balance has been taken, and that fact is displayed on the balancer 19, but if a vibration signal above a certain level is obtained, The dynamic balance is adjusted again by the same procedure. At this time, when the pulse motor 26 is rotated by a desired angle, the initial setting of the rotating body W is not determined, so the driving rotor 3 and the positioning rotor 25
Before the connection is released or after the connection is released, the pulse motor 26 is rotated in the reverse direction by the angle rotated immediately before, and the positioning means C is always set to the initial state.
As a result, the conditions for the next constant positioning are set, and the work of dynamic balance adjustment can be repeated.

[0025]

As described above, according to the method and the apparatus for constant positioning of the non-aligned position of the rotary body of the present invention, the position of the non-aligned part of the rotary body is always set to the set base. It can be automatically moved and stopped, there is no need to judge where the misalignment position is, as in the past, and there is no misreading of misalignment position or setting error, and dynamic balance adjustment work of the rotating body Not only can the quality of the product be improved, but the repetitive work can be performed very easily, and further automation can be achieved.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional view of a constant positioning device of the present invention.

FIG. 2 is a simplified vertical sectional view showing a state in which a drive rotor and a positioning rotor are connected in the apparatus shown in FIG.

FIG. 3 is a plan view of a ring magnet.

FIG. 4 is a side view of the ring magnet.

FIG. 5 is a graph showing signal waveforms detected by a vibration sensor and a measurement origin detection sensor.

FIG. 6 is a simplified plan layout diagram showing a conventional example.

FIG. 7 is a simplified side view layout diagram also showing a conventional example.

[Explanation of symbols]

A rotation driving means B detection means C positioning means W rotating body 1 set table 2 driving motor 3 driving rotor 4 shaft 5 base plate 6 upper plate 7 connecting rod 8 guide hole 9 rotating hole 10 center hole 11 fixed flange 12 ring magnet 13 measurement Starting mark 14 Polygon mirror 15 Mounting flange 16 Shaft hole 17 Vibration sensor 18 Measurement starting point sensor 19 Balancer 20 Moving mechanism 21 Rotating mechanism 22 Air cylinder 23 Cylinder rod 24 Movable plate 25 Positioning rotor 26 Pulse motor 27 Timing pulley 28 Timing pulley 29 Timing belt 30 Center hole 31 Ring magnet 32 Stopper ring 33 Stopper ring 34 Controller

Claims (2)

[Claims] 1. At the same time as detecting the vibration of a set table that rotates and holds the rotating body, the measurement starting point of the rotating portion including the rotating body is detected, and the position of the unmatched portion that generates the vibration is measured from both detection data. Misalignment position of the rotating body, which is converted into a rotation angle difference based on the starting point, and the rotating body is rotated by a predetermined angle based on the rotation angle difference so that the mismatching portion stops at a fixed position. Constant positioning method. 2. A rotation drive means in which a rotor is coaxially mounted on a drive rotor that is rotated by a drive motor fixed to a set table, and a vibration sensor fixed to the set table to detect vibration of the rotor. And a measurement starting point detection sensor that detects the measurement starting point mark attached to the drive rotor, inputs the signals from both sensors to the balancer, and generates the vibration between the position of the unmatched portion of the rotating body and the measurement starting point. Detecting means for generating a control signal according to the rotation angle difference, and a positioning rotor that is driven to rotate by a pulse motor and is detachable from the driving rotor, and the facing position of both rotors. The pair of N poles and S poles provided in the above is removable, and after setting the initial state where the N pole and the S pole of the positioning rotor are in fixed positions, the rotor is connected to the drive motor and Positioning means for driving the pulse motor based on the output control signal to rotate the rotating body by a predetermined angle via the driving rotor and stopping the unmatched portion at a fixed position. Positioning device for misaligned position of rotating body.