JPH0636402B2 - Magnetizing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetizing device for periodically magnetizing a peripheral surface of a disk-shaped magnetized body.

Background Art and its Problems A frequency generator that detects the rotation speed and rotation phase of a small motor is mounted on a disk that is the rotor of the small motor or a disk that rotates integrally with the rotor with a predetermined pitch. It is configured to detect a magnetized magnetic signal with a magnetic sensitive element.

A conventional magnetizing device for magnetizing the peripheral surface of a disk-shaped magnetized body used in such a frequency generator with a predetermined pitch is configured as shown in FIG.

In the drawing, a disc-shaped master 1 is magnetized with a reference magnetic signal of a predetermined pitch on its peripheral surface, and the master 1 is driven by a motor 2 to rotate at a predetermined rotational speed by a belt. A disk-shaped body 3 which is a magnetized body is coaxially attached to the master 1 so as to rotate integrally with the master 1. A detection head 4 is provided close to the peripheral surface of the master 1, and a reference signal detected by a detection circuit 5 from a reproduction signal of the detection head 4 causes
The magnetizing power supply circuit 6 is driven. The magnetizing power supply circuit 6 outputs a magnetizing pulse P having a predetermined cycle and applies the magnetizing pulse P to the magnetizing head 7 located near the peripheral surface of the magnetized body 3. As a result, the peripheral surface of the magnetized body 3 can be magnetized with a predetermined pitch.

In such a conventional magnetizing device, since one magnetized body is attached to one master 1, many magnets 1 and motors 2 are prepared when magnetizing many disk-shaped bodies. Therefore, it becomes uneconomical and causes a decrease in production efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a magnetizing device capable of magnetizing a plurality of magnetized bodies by one master.

SUMMARY OF THE INVENTION The present invention has a clamp mechanism that supports a magnetized body and rotates the magnetized body around an axis, an air bearing that supports the axis, and the like, and at least the shape and weight are substantially the same. At least two of the above-mentioned pulleys are provided with one rotating mechanism, one of which is provided with a disc-shaped master having a reference signal on its peripheral surface, and the other of which is provided with a flywheel whose shape and weight are substantially the same as those of the master. Is driven by one motor and the reference signal is detected by the detecting means, so that the magnetizing means can accurately magnetize the plurality of magnetized bodies.

Embodiment FIG. 2 and FIG. 3 show a first embodiment of the present invention, in which parts corresponding to those in FIG.

2 and 3, a first rotating mechanism 25 integrally supporting the master 1 is composed of a shaft 9, an air bearing 8, a pulley 12, a clamp mechanism 14, etc., and the master 1 is the air bearing 8 It is provided above the shaft 9 supported by. The air bearing 8 is composed of a boss 10 which is fitted on the shaft 9 and is integral with the shaft 9, and a bearing 11 which is arranged with the boss 10 through a gap. A pulley 12 is integrally fitted and fixed to a substantially central portion of the shaft 9. The shaft 9 is urged by a spring mechanism 13 and the lower end thereof is further lifted by a lifting device 24.

The detection head 4 is arranged close to the peripheral surface of the master 1. The clamp mechanism 1 is attached to the upper surface of the master 1.
4 is provided, and the work 15 is clamped by the clamp mechanism 14. The clamp mechanism 14 is V
A support member 17 in which the groove 16 is formed, and this support member 1
7 and a link mechanism 19 for moving the support member 18 in the directions of arrows a and b. The link mechanism 19 is adapted to be operated manually or by a drive source such as a plunger. The work 15 _1, there is formed by fixing a disc-shaped body serving as the magnetized body 3 to the shaft 20, the object to be magnetized body 3 which is magnetized by the magnetizing device according to the invention the rotor or the rotation of the small motor The disk-shaped body rotates integrally with the child, and the shaft 20 serves as the rotary shaft of a small motor. The workpiece 15 ₁ the axis 20
Is inserted into the V-shaped groove 16 of the support member 17 and supported by the support member 18, so that it is clamped coaxially with the shaft 9. A magnetizing head 7 is arranged close to the peripheral surface of the magnetized body 3.

On the other hand, the second rotation mechanism 26 integrally supporting the flywheel 22 having substantially the same weight and shape as the master 1.
Has the same structure as the first rotating mechanism 25.
Therefore, the same members as those of the first rotating mechanism 25 are designated by the same reference numerals. The workpiece 15 ₂ is clamped by the clamping mechanism 14. This work 1
Magnetizing head 7 is disposed 5 ₂ close to the peripheral surface of the magnetized body 3. The pulleys 12 belonging to the first and second rotating mechanisms 25, 26 are rotated by a common motor 2 via a belt 23 having a small elongation.

Although not shown, the output signal of the detection head 4 is applied to the detection circuit 5 in the same manner as in FIG. 1, and the output pulse P of the magnetizing power supply circuit 6 is two magnetizing heads. 7
It is designed to be supplied to.

According to the above configuration, by rotating the motor 2,
Master 1 and flywheel 22 rotate synchronously,
Along with this, the two works 15 ₁ and 15 ₂ rotate, so that the peripheral surfaces of the two magnetized members 3 can be magnetized with a predetermined pitch at the same time. Further, since the belt is driven by using the air bearing 8, there is no bearing noise, gear vibration, etc. as in the case where a conventional ordinary bearing is used, and uneven magnetization does not occur even at high speed rotation. Further, since the clamp mechanism 14 has a simple structure, it does not affect the rotation accuracy. According to the present embodiment, by rotating about 10 times at a speed of 20 to 30 rpm, it was possible to magnetize 526 teeth with 0.22 μm pitch with high accuracy. The magnetizing device shown in FIGS. 2 and 3 is configured so as to be controlled by a system control circuit (not shown).
The control signal of the lifting device 24, the motor control signal, the control signal of the clamp mechanism 13, and the control signals of other predetermined circuits and mechanisms are output at predetermined timing.

FIG. 4 shows the second embodiment, in which one master 2 and one master 1 and 3 are driven by one motor 2 via two belts 23.
By rotating the pieces of the flywheel 22 to the common, which is constituted of four work 15 _{1-15 4} so magnetized simultaneously. According to the present invention, it is possible in principle to magnetize more workpieces at the same time.

EFFECTS OF THE INVENTION According to the present invention, a plurality of rotating mechanisms having a clamp mechanism, an air bearing, and the like have substantially the same shape and weight, and since the air bearings are used for the bearings, the rotating accuracy of each rotating mechanism is high. Moreover, the rotation speeds and phases of the plurality of rotation mechanisms are matched with each other with high accuracy, and the magnetization unevenness does not occur even at high speed rotation. Further, a plurality of magnetized bodies can be magnetized at the same time, so that the production efficiency and the economical efficiency are remarkably improved, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view showing a conventional example, FIG. 2 is a plan view showing a first embodiment of the present invention, FIG. 3 is a side view, and FIG. 4 is a plan view showing a second embodiment. . In the reference numerals used in the drawings, 1 ... Master 2 ... Motor 3 ... Disc-shaped magnetized body 4 ... Detection head (detection means) 6 ... Magnetization power supply circuit 7 ... Magnetization head (magnetization head) Means) 8 ... Air bearing 9 ... Shaft 12 ... Pulley 14 ... Clamp mechanism 15 ₁ to 15 ₄ ... Work 22 ... Flywheel 23 ... Belt 25 ... First rotation mechanism 26 ... Second rotation It is a mechanism.

Claims (1)

[Claims] 1. A shaft, a pulley for rotating the shaft, a clamp mechanism for supporting a disk-shaped magnetized body to rotate the magnetized body around the shaft, and an air bearing for supporting the shaft. Of at least 2 having substantially the same shape and weight
Two rotating mechanisms are provided, one of which has a disc-shaped master with a reference signal on its peripheral surface, and the other has a flywheel whose shape and weight are substantially the same as those of the master, and at least two of the above The pulley is directly driven by one motor via the belt, the reference signal is detected by the detecting means, and a magnetizing pulse based on the detected reference signal is supplied to the magnetizing means. A magnetizing device for magnetizing.