JPS58146056A - Magnetic head moving device - Google Patents

Abstract

PURPOSE:To make free the fitting position of a stepping motor for driving a magnetic head and to realize a low-cost and large capacity recording and reproducing, by moving a carriage through a pulley which acts as a running block. CONSTITUTION:A spring 14 is stretched between the projected part 1a of a carriage 1 contacting with a guide shaft 5 and a supporting frame 2 and always pulls the carriage 1 toward the supporting frame 2. At the side of the carriage 1, a pulley 16 is supported freely rotatably by a shaft 15. One end of a steel belt 17 is fixed to a supporting frame 3 by means of a fittings 18 and the other end is fixed to a pulley 12 attached to the output shaft 11a of a stepping motor 11 fixed at a location near the supporting frame 3 after the belt 17 is put around the pulley 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head moving device chamber, and more particularly to a magnetic head moving device having an improved seek mechanism for a magnetic head.

As a magnetic head moving device for a conventional magnetic disk device, a stepping motor is used as a driving source, and one set of transmission force using a spikele cam or a steel belt is employed.

A conventional magnetic helix seek mechanism of this type is shown in FIGS. 1 and 2.

In the conventional example shown in FIG. 1, a carriage designated by reference numeral 1 is slidably attached to guide shafts 4 and 5 that are horizontally suspended between left and right support frames 2 and 3 in a parallel manner. A magnetic head 6 is fixed to one end of the carriage 1.
The proximal end of a pad arm 8 is rotatably supported on a support column 7 that protrudes opposite to this via a shaft 9, and a magnetic field is transmitted through a head pad (not shown) provided at the tip of the pad arm 8. A disk 10 is held between a magnetic head 2 and magnetic recording and reproduction are performed. A stepping motor 11 is fixed to a fixed part of the device, and a steel belt 1-3 is wound around a pulley 12 fixed to an output shaft 11a of the stepping motor 11. The steel belt 13 has a wide part 13a and a narrow part 1.
3b, and a notch 13c into which the narrow portion 13b is fitted is formed on the wide portion 13a side.

The conventional structure shown in FIG. 2 differs from the example shown in FIG. 1 only in that the shape of the carriage 1 is larger and the stepping motor 11 is disposed outside of one of the guide shafts 5. And the other parts. It's similar to habo.

In the conventional structure shown in FIGS. 1 and 2, the carriage 1 is moved by a stepping motor 11 by winding and unwinding the wide portions 13a, 13b of the steel belt 13.

When such a stepping motor is used to drive the carriage, the stepping motor 11 needs to have a large torque, which increases the size of the motor itself, and furthermore, if a steel belt 13 is used, it will be difficult to handle a large capacity. Greater design constraints. ``For example, to double the recording capacity, one magnetic disk
Assume that the track width of 0 is set to 2, and the number of tracks is doubled. In this case, the step angle of the stepping motor 11 should be set to IA, or the diameter of the pulley 12 should be set to V2.
Either method must be adopted.

Step angle 1/! In this case, the motor is expensive and there is a limit to the accuracy of the step angle. Also, pulley 1
If the diameter of 2 is 2, then steel belt 13
The bending stress increases in inverse proportion to the bending radius, resulting in a reduction in service life.

Furthermore, once the positions of the magnetic head 6 and the guide shaft 4.5 of the carriage are determined, the mounting position of the stepping motor 11 is naturally limited as shown in FIGS. 1 and 2. In the X direction shown in FIG. 2, the position is limited to about V2 with respect to the width of the carriage guide.

Also, depending on the structure of the carriage 1, the
As is clear from the figure, the position of the stepping motor 11 in the y direction is greatly different, resulting in an increase in the size of the device.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology.It has an extremely simple structure, eliminates restrictions on the mounting position of a stepping motor, and provides a magnetic head that can perform large-capacity recording and reproducing at low cost. The purpose is to provide a mobile device.

In order to achieve the above object, in the present invention, a pulley is provided on the carriage side, and one end is fixed to the device side and the other end is fixed to the output shaft side of the stepping motor. The principle of a pulley allows for highly accurate and stable operation, and the stepping motor is mounted in a structure that eliminates restrictions on position.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

3 and 4 are for explaining different embodiments of the present invention, and in each figure, the same parts or corresponding parts as in FIGS. Omitted.

In the embodiment shown in FIG. 3, the carriage 1 has a spring 14 stretched between the protruding portion 1a in contact with the guide shaft 5 side and the support frame 2, so that the carriage 1 is always placed on the support frame 2 side. It is being pulled to. A pulley 16 is rotatably supported on a side surface of the carriage 1 by a shaft 15.

On the other hand, the reference numeral 17 is a steel belt continuously formed to a predetermined width, one end of which is fixed to the support frame 3 side via a stopper 18, and the other end is attached to the boot 916 and then Has it been folded back and fixed in a position closer to the support frame 3? It is fixed to a pulley 12 fixed to the output shaft 11a of the chipping motor 11.

Since this embodiment is constructed as described above, the carriage 1 is always given the habit of moving in the direction of the support frame 2 shown by arrow A. Therefore, in order to move the carriage 1 in the direction opposite to the arrow A, for example, the stepping motor 11
must be rotated in the direction of arrow B in Figure 3.

Then, the steel belt 18 is wound around the pulley 12, and the pulley 16 rotates to move the carriage 1 in a direction opposite to the direction of arrow A. At this time, the pulley 16 moves together with the carriage 1, so it functions as a movable pulley. Therefore,
Pulley 1 fixed to the output shaft of stepping motor 11
If the amount of movement of the steel belt 17 in the circumferential direction is 2 times, the carriage 1 which is integrated with the pulley 16 serving as a movable pulley will move 1n.

Therefore, even if the diameter of the pulley 1°2 is made smaller, the carriage 1, and therefore the magnetic head 6, can be moved to V2 with the same diameter as before, and the double density magnetic disk 10 can be moved.
can also be adequately dealt with.

In other words, it is possible to handle magnetic disks with twice the capacity by simply providing a boot 916 that functions as a movable pulley and a return spring 14 with almost the same structure as the conventional one.

By the way, since the steel belt 17 is not fixed to the side of the carriage 1 like conventional steel belts,
Stepping motor 11 is installed in carriage 1
For example, by simply adjusting the length of the steel belt 17, it can be placed outside the support frame 3, as shown in FIG. degree can be given.

Note that in order to double the accuracy of the movement of the carriage 1 as described above, it is necessary that the X direction, which is the direction in which the carriage 1 moves, and the steel belt 17 are parallel.

In other words, the condition is that the directions of the arrows Xe'J shown in FIGS. 3 and 4 are perpendicular to each other. Here, the y direction is a direction perpendicular to the moving direction of the carriage 1.

In addition, in the embodiment shown in FIGS. 3 and 4, a constant load is applied to the spring 14, which is illustrated as a returning coil spring.
If a constant torque spring is used, the load applied to the stepping motor 11 will be constant and more stable operation can be achieved.

As is clear from the above description, since the present invention employs a structure in which the carriage is moved via a pulley that functions as a moving pulley, a stepping motor with the same structure as the conventional one is used as a drive source. It can accommodate magnetic disks with twice the capacity, reducing total costs.

Furthermore, since the hysteresis characteristic of the stepping motor can be ignored, accuracy can be improved and performance can be stabilized. -C, the stepping motor can be mounted in any position, increasing the degree of freedom in design.

[Brief explanation of the drawing]

1 and 2 are perspective views illustrating different conventional structures, and FIGS. 3 and 4 are perspective views illustrating different embodiments of the present invention.

Claims (1)

[Claims] It has a carriage to which a magnetic head is attached and is given the habit of moving in a predetermined direction, a pulley rotatably attached to the carriage, and a belt stretched over the pulley, with one end of the belt fixed to a fixed part of the device. A magnetic head moving device characterized in that the carriage is moved by attaching the carriage to the pulley in the middle and turning it back and moving the other end.