JPS58115661A - Controlling method for servo track writer - Google Patents

Abstract

PURPOSE:To obtain a controlling method capable of driving a motor in an invariably constant speed rotation, by increasing the tensile strength of a belt during the actuation of a motor and decreasing it during the constant speed rotation of the motor. CONSTITUTION:When the motor is actuated, enough tensile force to prevent the belt from slipping at the contacting part between pulleys 2 and 6 is applied to the belt 3 in its inward direction by a tension arm 7 and a tension roll 8 and when the rotating spindle 5 of a magnetic disk 4 also enters into a constant- speed rotation state through the constant-speed rotation of the motor 1, the tensile force is reduced. Through the reduction of the tensile force, a slip of the belt 3 at the contacting part with the pulley 2 or 6 is permitted when the rotational fequency Tm of the motor per unit time varies owing to unevenness of the rotation of the motor and is small corresponding to the rotational frequency Td of the rotating spindle 5 of the magnetic disk 4 per unit time, and eliminated when the rotational frequency Tm corresponds to the rotational frequency Td.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a method of controlling a servo track writer that records servo information on a servo track of an agIL disk.

G2> Background of the Technology In recent years, the recording density of magnetic disks has become extremely high, and it has become necessary to record the servo information necessary for servoing magnetic flux disks with even higher precision and deliver it to users.

Figure 1 is a diagram mainly for explaining the drive section of a conventional servo track writer that records servo information on a magnetic disk, where 1 is a motor, and 2 is a motor provided on the rotating shaft of the motor. A pulley, 8 is a belt, 4 is a magnetic disk on which servo information is to be recorded, 6 is a rotating shaft that rotates the magnetic disk 4, 6 is a pulley provided on the whirling rotating shaft 6, 7 is a ten V
, an arm, 8 a Tenseen roller, 9 a Tenseen 1M118111, 10 a recording head, and 11 an information generator.

As shown in FIG.
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A pulley 6 is attached to the rotating shaft 5, and the rotational force of the rotor 1 is generated by connecting the pulley 2 and the pulley 6, which are connected to the rotating shaft KPM of the motor 1, with a belt 8.

At this time, the contact area and contact pressure between the belt 8 and each pulley are increased to increase the force, and the belt 3 is moved to the pulley 6 in order to transmit the force generated in the pulley 2 to the pulley 6 without loss. Within 180 rotations II, the tension lever arm 7 is operated by the tension adjustment mechanism 9, and the tension tension adjustment mechanism 9 is activated.
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With this method, the rotational force of the rotor is transmitted to the rotating shaft 5 of the magnetic disk 4 without loss, and
The number of rotations Td per unit time of the rotating shaft 60 is determined by the diameter of the pulley 6 and the number of rotations Tm of the rotor per unit time.

Therefore, when the belt 8 does not slip during rotation at the vibrating portion between the pulley and the pulley 6, the number of revolutions per unit time Tdti of the magnetic disk is proportional to the number of revolutions per unit time Tm of the magnetic disk.

At this time, when the rotation speed Tm of the rotor 1 is always constant, the rotation speed 7d of the rotating shaft 6 of the magnetic disk is always constant.

In this state, servo information is generated on the magnetic disk 4.
When recording relevant information using the recording head 1G, the necessary information is reliably recorded in one revolution of the recording track of the magnetic disk 4.

However, when the driving shaft 60 of the magnetic disk fluctuates, the quality of recording servo information deteriorates, and the amount of servo information from the recording head is reliably stored in the recording track of the magnetic disk 4 where servo information is to be recorded. K)tL servo information is not recorded, and the amount of recorded servo information is excessive or insufficient 1IllKIill! will be recorded.

The main cause of such rotational unevenness in the rotational speed Td of the magnetic disk 40 rotating shaft O per unit time is due to fluctuations in the magnetic slip of the rotor of the motor 10, and the occurrence of rotational unevenness is extremely irregular and indeterminate. Therefore, the drawback of the conventional servo track fitter is that the amount of servo recording on the recording track of servo information on the magneto-electric disk 4 is excessive or insufficient.
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4) Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention provides a control method capable of driving a magnetic disk on which servo information is to be recorded so that it always rotates at a constant speed without causing rotational irregularities with respect to a specified rotational speed. The purpose is to provide the following.

(6) Structure and object of the invention According to the present invention, a pulley layered on the rotating shaft of the motor and a magnetic It is characterized by controlling with a tensine arm so that the tension of the belt connecting the pulley attached to the rotating shaft of the disk is increased when the motor is started, and is decreased when the motor shifts to constant speed rotation. This is achieved by providing a method of controlling a servo track figure that

(6th example of dormitory filter of invention) Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

FIG. 2 is a diagram showing the construction of the servo track fitter according to the present invention, in which 1 is a drive IaJ motor;
2 is a pulley provided on the motor 10 rotating shaft, 8 is 1
- A drive belt connecting the pulley 2 and the pulley 6, 4 a magnetic disk on which servo information is recorded, 5 a rotating shaft for rotating the magnetic disk, 6 a pulley provided on the rotating shaft 5, and 7 a pulley. 8 is a tension roller installed at the tip of the tension arm 70 and applies tension to the belt 8; 9 is a mechanism for adjusting the tension applied to the belt 8 of the tension arm 7; Hl is a start-up of the motor I-1; and a separator that separates between when stopped and when running at a constant speed and controls the l1 clause mechanism 9;
Reference numeral 10 indicates a recording head for recording servo information on a disk on which T-point information is to be recorded, and reference numeral 11 indicates a servo information generator for sending servo information to the recording head 10.

When the motor 41-1 is turned on by W to start the motor, the magnetic disk 41-1 is in a stopped state, so the 1. Il! Pulley 2 installed on the I-hiro shaft and 7'- installed on the rotation kllll) 15! In order to prevent the belt 8 connecting the J-6 from slipping at the contact area between the pulley 2 and the pulley 6, the adjustment mechanism 9 of the tensile arm 7 is controlled by a separator 12 that detects the start of the motor. The tensile arm 7 and the tear V-ron roller 8 apply sufficient tension to the belt 8 inward, thereby increasing the contact area and contact pressure between the pulley 2 and pulley 6 and the belt 8. When the rotary shaft 6 of the magnetic disk 4 also reaches a constant speed rotation state due to the constant speed rotation of the motor 1, the separator 12 detects this state and controls the adjustment mechanism to increase the tension on the belt 8. scene arm 7 and ten V,
This reduces the tension applied by the tensioner 8.

This decrease in tension causes uneven rotation of the motor, causing the number of revolutions Tm per unit time to move back, and the rotating shaft 5 of the magnetic disk 4
(8) When the unit time is small corresponding to the number of rotations Td, the belt 8 will not slip at the contact part with either the pulley 2 or the pulley 7'-'-6. When the rotational speed Td of the rotating shaft 5 corresponds to the rotational speed Td per unit time, no slipping occurs.

Now, the rotation speed Td of the motor l per unit time fluctuates and decreases from the specified rotation speed, and when it dies, the magnetic disk 40 rotating shaft 60 rotates due to inertia due to the slippage of the belt 8, and within a minute time, the rotation speed Td per unit time changes to the specified rotation speed. It is possible to maintain 9 rotations.

That is, the rotating shaft 60 of the magnetic disk 4 per unit time O[8]
When the number of revolutions Td is the specified rotation, the magnetic disk 40 and the rotating shaft 6 rotate at O rotation within a minute time when the rotation number Tm per unit time of the motor l that drives the rotating shaft decreases by the specified number of rotations. can be maintained by inertia, and the number of rotations Td per unit time can be maintained at a prescribed value of 1α.

When the rotation speed Tm of the motor per unit time 9 is larger than the standard value, the rotation speed Td per unit time of the rotation 4115 is maintained at the specified rotation speed.

(7) Effects of the Invention As is clear from the invention, the number of rotations per unit time of the magnetic disk can be maintained at a specified value extremely stably and with high precision by a simple method of relaxing the tension of the transmission belt between the pulleys. It is possible to do this, and the rotational stability is improved by 1/108 degrees compared to when the belt tension is not loosened.
It is now possible to record servo information with high precision.

[Brief explanation of drawings]

FIG. 1 is a main view of a conventional servo tofuctor, and FIG. 2 is a main view of a servo track writer according to the present invention. In the drawing, l is the motor, 2 is the motor 1 Noah'-I
J-18 is a belt, 5 is a rotating shaft of the rotary disk 4, 6 is a pulley of the rotating shaft 5, 7 is a tensile arm, 9 is an adjustment mechanism for the tensile arm 7, and 12 is a rotating shaft of the motor 1. Separator.

Claims (1)

[Claims] In the servo track writer, the servo track writer has a rotating shaft that supports a magnetic disk for recording servo information, and a drive unit that applies rotational force to a pulley provided on the rotating shaft via a belt, when the motor is started. The control of the Yapothook filter is characterized in that the tension of the belt is selected so as to increase the tension of the L-curved belt, and to moderate the tension of the belt when the motor is rotating at a constant speed. Method.