JPS61293151A - Head driving mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a head drive mechanism of a floppy disk device, etc., and in particular, the head drive mechanism of a floppy disk device, etc. The present invention relates to a head drive mechanism that can maintain the position of a child.

[Background Art] In recent years, office automation (OA) has become popular, and floppy disk devices are widely used as storage devices. Linear pulse motors are often used to drive the heads of these floppy disk devices, and there is a strong demand for smaller, cheaper, and thinner motors. Therefore, the present applicant previously proposed a linear pulse motor that achieves the above requirements in Japanese Patent Application No. 59-47863.

3 to 4 are perspective views showing configuration examples of a linear pulse motor of the same type as the linear pulse motor according to the above proposal;
FIG. 6 is a plan view showing the configuration when this linear pulse motor is applied to drive the head of a floppy disk device. In these figures, l is a mover made of mild steel or the like, 2 is a stator, and the lower surface of this mover 1 is formed with comb-like mover teeth 1a.

On the other hand, the stator 2 sequentially attracts the mover teeth 1a by sequentially switching the magnetic poles with increasing magnetic flux through the interaction between the permanent magnet 3 and the electromagnet, and causes the mover 1 to reciprocate in a stepwise manner. It consists of the following.

First, a slit plate 4 is arranged on the lower side of the mover 1 and facing it, and on the lower side of the slit plate 4 there is a yoke 6 to which a coil 5.5 for an electromagnet is fixed, and a yoke 6 that is H-shaped in plan view. Permanent magnets 3 having shapes are fixed in sequence.

A cross-shaped groove is formed in the center of the yoke 6, thereby forming four magnetic poles 6a, 6b, 6c, 6.
d is being made. Moreover, magnetic poles 6 a, 6 b,
At the position on the slit plate 4 directly above the comb-shaped pole teeth 4 a, 4 b, 4 c, 4
d is formed and faces the moving child teeth 1a of the moving child 1 with an extremely small gap therebetween.

This gap is formed by a pair of linear bearings 7.7 arranged on both sides of the slit plate 4. A slider l is placed on the linear bearing 7, and the linear bearing 7 and the slider l The slit plate 4 and guide 8,
It is fitted into the running path formed by 9 so as to be movable in the longitudinal direction.

FIG. 5 is a perspective view showing the configuration of the linear bearing 7. As shown in the figure, the linear bearing 7 consists of a pair of rollers 11.11, balls 12.12, and a retainer 13 that holds them. II
is in the opening 14.14, and the ball 12.12 is in the recess 15.
+5, each is rotatably fitted. In addition,
In FIG. 3, 16 is a stopper that is bent upward to restrict movement of the linear bearing 7, and 18 is a back plate that forms a magnetic path for the permanent magnet 3.

According to the above configuration, both sides of the lower surface of the slider 1 abut against the rollers 11, 11 of the linear bearing 7, and the slider l
Both side edges of the ball 12.12 abut. Then, the movable tooth 1a and the pole teeth 4a, 4b, 4c.

4d face each other with a slight gap. In this state, when a predetermined pulsed current is supplied to the coil 5.5, the mover 1 moves stepwise on the stator 2 and is fixed to the mover 1 via the carriage 20a shown in FIG. The head 21a moves above the floppy disk 19.

[Problems to be Solved by the Invention] The linear pulse motor described above is extremely superior in that it can be configured to be small, low-cost, and thin, but when it is used to drive the head of a floppy disk device, etc., the following problems occur. There is a problem like this.

In other words, a floppy disk device, especially a floppy disk device that uses a battery as a power source, is configured so that current is supplied to the linear pulse motor only when driving the head (seek time), so that no unnecessary current flows. It is hoped that However, when no current is supplied to the linear pulse motor, the force that holds the mover 1 in a fixed position is weak, so a slight impact will shift the head position, and the subsequent head drive operation will not be normal. There was a problem that it became impossible to go to.

Furthermore, since the carriage 20a is fixedly fixed in series with the slider 1, there is a drawback that the length of the floppy disk device in the longitudinal direction becomes long.

The present invention was made against this background, and provides a head drive mechanism that has a strong holding force against impact even when no current is supplied, and that has a short longitudinal length. The purpose is to provide

[Means for Solving the Problems] A lever having one end connected to an engaging portion formed on a slider and a central portion connected to a fulcrum, and a lever connected to the other end of the lever and having a head. a carriage that reciprocates the
and a regulating member that regulates the moving direction of the carriage that moves with the rotation of the lever in a direction parallel to the traveling direction of the slider, and the three connecting parts of the lever are all rotatable. , and at least two connecting portions are characterized in that they are slidable along the axial direction of the lever.

[Operation] According to the above configuration, when an impact is applied from the outside while the current to the linear pulse motor is off, substantially the same moment is generated at both ends of the lever. This is because the weights of the mover and the carriage are approximately equal. Therefore, even when the current is off, the lever does not rotate and the slider does not move due to impact. As a result, when used to drive the head of a floppy disk device, the current to the linear pulse motor can be cut off except when seeking.
It becomes possible to measure energy savings. Furthermore, since the linear pulse motor and the carriage can be arranged in parallel, the length of the floppy disk device in the longitudinal direction can be shortened. Furthermore, even if the linear pulse motor is erected vertically, the weight of the slider is canceled out by the weight of the carriage, so it is possible to use the linear pulse motor erected vertically.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIG. 1, 20 is a carriage, and a head 21 is fixed to the tip of this carriage 20. Further, on the lower side of the carriage 20, a pair of guide bars 22a, 22 running in the radial direction of the floppy disk 19 are provided.
b, and the carriage 20 is slidably fitted to these guide bars 22a, 22b. This allows the head 21 to reciprocate on a straight line passing through the center of rotation of the floppy disk 19.

On the other hand, a fixing pin 23 is formed on the upper surface of the guide 8.
A lever 26 having elongated holes 24, 25 formed at both ends is rotatably attached to the fixing pin 23. A pin 27 formed at the center of the top surface of the slider 1 is slidably inserted into the long hole 24 on the side of the slider 1, and a pin 27 formed at the top surface of the carriage 20 is inserted into the other long hole 25. A pin 28 is slidably inserted.

Here, the weight of the mover 1 is Wl, the weight of the carriage 20 is W7, the distance between the fixed pin 23 and the pin 27 on the mover 1 side is σ1, and the distance between the fixed pin 23 and the pin 28 on the carriage 20 side is I2t. Then, W 1X Q I= W x
X Q *... Each element is determined so that the formula (1) holds true.

That is, the moment formed by the mover 1 and the lever 26 and the moment formed by the carriage 20 and the lever 26 are made to match.

In such a configuration, when a predetermined current is supplied to the linear pulse motor, the mover 1 travels while rotating the lever 26, and along with this, the carriage 20 is regulated by the guide bars 22a and 22b. It moves in the opposite direction to the mover 1 and parallel to the mover 1. Further, the head 21 moves together with the carriage 20, and a seek operation is performed.

On the other hand, no current is supplied to the linear pulse motor,
If an external impact is applied while the mover 1 is stopped, the lever 26 will not rotate because the same moment will be generated at both ends of the lever 26. Therefore,
Neither the mover 1 nor the carriage 20 moves, and movement of the mover 1 due to impact can be prevented.

Furthermore, since the carriage 20 and the mover 1 are arranged in parallel, the length of the floppy disk device in the longitudinal direction can be shortened. Furthermore, even if the linear pulse motor is erected vertically, the weight of the slider is canceled out by the weight of the carriage, so it is possible to use the linear pulse motor erected vertically.

In the above embodiment, the central portion of the lever 26 is rotatably supported by the fixing pin 23, but the present invention is not limited to this. For example, as shown in FIG. 2(a), one end of the lever 26 is rotatably attached to the pin 27 on the slider 1, and a long hole 41 is formed in the center of the lever 26 to fix it. It may be slidably fitted onto the pin 23. Further, as shown in FIG. 2(b), the pin 27 and fixed pin 23 on the mover l are connected to the elongated holes 24 and 41.
They may be slidably fitted into each other, and further,
As shown in FIG. 2C, a common elongated hole 42 slidably fitted to the pins 27, 23, 28 may be formed over substantially the entire length of the lever 26.

Furthermore, the fixing pin 23 and the carriage 20 are not limited to the guide 8, but may be attached to the fixing part of the linear pulse motor, a part extending from the fixing part, or a part of the device to which the linear pulse motor is attached. You can choose.

[Effects of the Invention] As explained above, the present invention provides a lever having one end connected to an engaging portion formed on a slider and a central portion connected to a fulcrum, and the other end of the lever being connected to an engaging portion formed on a slider. a carriage that is connected to each other and that causes the head to reciprocate; and a regulating member that regulates the moving direction of the carriage that moves with the rotation of the lever in a direction parallel to the running direction of the slider, and the lever All of the three connecting parts are rotatable, and at least two of the connecting parts are slidable along the axial direction of the lever, so that no current is being supplied to the linear pulse motor. Also, it is possible to prevent the mover from moving due to external impact. Therefore, it is not necessary to supply current to the linear pulse motor except during seek, and it is possible to reduce power consumption and heat generation. Furthermore, since the mover and the carriage can be arranged in parallel, the length in the longitudinal direction of the floppy disk device can be shortened.

Furthermore, it becomes possible to use the linear pulse motor vertically.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of a head drive mechanism according to an embodiment of the present invention, FIG. 2 is a plan view showing a state in which a lever is attached according to a modification of the same embodiment, and FIG. Figure 4 is an exploded perspective view showing the configuration of the linear pulse motor, Figure 4 is a perspective view showing the external configuration of the linear pulse motor, Figure 5 is a perspective view showing the configuration of the linear bearing of the linear pulse motor, Figure 6 is the conventional FIG. 2 is a plan view showing the configuration of a head drive mechanism of the floppy disk device of FIG. 1... Mover, 8... Guide (guiding member), 20... Carriage, 21... Head, 22a, 22b... Guide bar ( regulatory components)
, 23. Old... Fixed pin (support point), 26... Lever, 27... Pin (engaging part).

Claims (1)

[Claims] In a head drive mechanism configured to drive a head by a linear pulse motor having a guide member and a mover that travels on a travel path formed by the guide member, an engaging portion having one end formed in the mover. a lever that is connected to the lever and whose center portion is connected to a fulcrum; a carriage that is connected to the other end of the lever and that reciprocates the head; and movement of the carriage that moves as the lever rotates. and a regulating member for regulating the direction parallel to the running direction of the mover, the three coupling parts of the lever are all rotatable, and at least two coupling parts are arranged in the axial direction of the lever. A head drive mechanism characterized by being slidable along the head.