JPH0725904Y2 - Head transfer mechanism - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to a motor applicable to transfer of a magnetic head of a floppy disk device.

[0002]

2. Description of the Related Art There is a mechanism utilizing a lead screw shaft as one of magnetic head transfer mechanisms for a floppy disk drive. A conventional mechanism of this type has a configuration shown in FIG. In the figure, 1 is a lead screw shaft and 2 is a stepping motor. The motor 2 includes a motor shaft 2a, a pair of bearings 2b and 2c that support the motor shaft 2a, and the motor shaft 2
It comprises a rotor 2d fixed to a and a stator 2e surrounding the rotor 2da, and is attached to the outside of the vertical side wall 3a of the frame 3 of the floppy disk device. The lead screw shaft 1 has one end supported near a bearing 4 incorporated in the upright wall 3b of the frame 3, is a member separate from the motor shaft 2a, and has the other end coupled to the motor shaft 2a by a coupling 5. It is connected. The lead screw shaft 1 is rotated by transmitting the rotation of the motor shaft 2a via a coupling 5.

That is, in the conventional motor, the lead screw shaft 1 is a separate component from the motor shaft 2a, and the third screw shaft 1 is connected to the motor shaft 2a by the coupling 5.

[0004]

However, in the conventional motor, since the coupling 5 is used, the number of parts is increased. The mounting accuracy of the motor 2 is directly expressed as the deflection of the lead screw shaft 1 and the magnetic force is reduced. There was a problem that the accuracy of head transfer deteriorates.

[0005] Therefore header present invention is that to solve the above problems
It is intended to provide a transfer mechanism .

[0006] The present invention includes a carriage body having a head, the head moving mechanism having a motor, said motor
Is a cylindrical stator assembly, and the stator assembly.
The rotor installed inside and the rotor is fixed on one end side.
The stator assembly and project outwards from the stator assembly
Reliable to have a screw groove for transferring the transferred object by rolling.
Motor shaft integrally having a hard screw part and a first shaft
One vertical wall with built-in receiver and second bearing
The other vertical wall that is confined, and the one vertical wall and the other
With a connecting base portion between the vertical wall and one of the vertical
The wall is fixedly attached to the stator assembly and
The first bearing is a portion of the motor shaft near the rotor.
The second bearing supports the tip side of the motor shaft.
The carriage body has a structure of a substantially U-shaped frame for supporting, and the carriage body has a structure having an arm portion and a pressing spring, and the arm portion and the pressing spring elastically move the lead screw portion. It is configured such that it is fitted in the above-mentioned screw groove by sandwiching it.

[0007]

A second bearing having a structure in which the motor shaft is integrally provided with a lead screw portion and a frame are provided.
The structure in which the tip end side of the motor shaft is supported by the above functions not only to improve the rotation accuracy of the lead screw portion, but also to facilitate the assembly into the device. The structure in which the lead screw portion is elastically sandwiched by the arm portion and the pressing spring acts to simplify the structure for connecting the carriage body to the lead screw portion.

[0008]

DETAILED DESCRIPTION FIG. 1 is a sectional view of a magnetic head transport mechanism ing to the present invention, FIG 2 is an exploded perspective view showing a magnetic head transport mechanism of Figure 1 in conjunction with the carriage. This magnetic head transfer mechanism will be described later.

First, a floppy disk device to which the magnetic head transfer mechanism of the present invention is applied will be described with reference to FIGS.

The floppy disk device 10 is provided with a head carriage 12, a magnetic head transfer mechanism 13, a turntable 14, a cam plate 15 and a cartridge holder 16 on the upper surface of a frame 11.

The head carriage 12 includes a magnetic head 17
And a pad support arm 20 which is attached to the carriage body 18 and has a pad 19 at its tip. The head carriage 12 can move in the directions of the arrows X ₁ and X ₂ while being guided by the guide rod 21 by the magnetic head transfer mechanism 13.

The cam plate 15 is movable in the directions of arrows X ₁ and X ₂ , and the cartridge holder 16 is movable in the directions of arrows Z ₁ and Z ₂ . As shown in FIGS. 3 and 4, when the cam plate 15 is in the position displaced in the direction of the arrow X ₁ , the cartridge holder 16 moves the tilted cam 5 of the cam plate 15.
It is in a raised position displaced in the direction of arrow Z ₁ by a. When the cam plate 15 is displaced in the arrow X ₂ direction, the cartridge holder 16 moves down. The pad 9 is the cartridge holder 16
It goes up and down according to the operation of.

As shown in FIGS. 3 and 7, a floppy disk cartridge (hereinafter referred to as a disk cartridge) 22 has a flat cartridge case 23, a floppy disk (hereinafter referred to as a disk) 24 in the cartridge case 23, and a cartridge case 23. To arrow Y ₁ ,
The shutter 25 is slidably mounted in the Y ₂ direction.

The disk cartridge 22 has an insertion opening 26.
By inserting it in the direction of the arrow X ₁ through, it is mounted as shown in FIGS. That is, in the disc cartridge 22, the shutter lever 27 rotates clockwise in association with the entry into the cartridge holder 16 in the raised position to open the shutter 25, and further the lock lever 2
8 is rotated clockwise to unlock and the cam plate 1
5 slides in the direction of the arrow X ₂ , and the cartridge holder 16 is pulled by the coil springs 29a and 29b and moves down together with the disc cartridge 22. As a result, the disc cartridge 22 has the opening 23 of the cartridge case 23.
It is attached with a and 23b open. In particular, as shown in FIG. 7, the magnetic head 17 is attached to the lower surface of the disk 24, and the pad support arm 20 rotates clockwise to bring the pad 19 into contact with the disk 24 and press it against the magnetic head 17.

The disk 24 has a hub 30 placed on the turntable 14 and is rotated at a high speed by a disk drive motor 31 so that the magnetic head 17 is moved by the magnetic head transfer mechanism 1.
3, and recording or reproduction is performed.

When the eject button 32 is pressed, the disk cartridge 23 once rises in the direction of the arrow Z ₁ and moves in the direction of the arrow X ₂ contrary to the above-mentioned mounting, and is ejected out of the apparatus 10.

Next, the magnetic head transfer mechanism 1 according to the present invention.
3 will be described mainly with reference to FIGS.

Reference numeral 40 denotes a lead screw shaft, which protrudes outward from the two bearings, that is, the first bearing 41 and the second bearings 41 and 42, on both sides of the lead screw portion 40a. It is 40c.

Reference numeral 43 is a substantially U-shaped frame, which comprises vertical walls 43a and 43b on both sides and a connecting base portion 43c between them. The vertical walls 43a and 43b respectively have first and second bearings 41 and 42. Is incorporated. Also one of the upright walls 4
3a functions as a stator mounting portion, and the connection base portion 43c functions as a mounting portion for the frame 11.

Reference numeral 44 is a rotor, which is fixed to the protruding portion 40b.

Reference numeral 45 is a substantially bottomed cylindrical stator assembly, which surrounds the rotor 44 and has a screw 46 on the upright wall 43a.
They are fixed by screws a and 46b. This allows
The stator assembly 45, the rotor 44, and the lead screw shaft 40 constitute the stepping motor 47 of the present invention.

Therefore, in the magnetic head transfer mechanism 13, the lead screw shaft 40 itself is the motor shaft of the stepping motor 47 and has a unitized structure.

In this mechanism 13, since the lead screw shaft 40 has two bearing points, the runout of the lead screw shaft 40 is small, and the lead screw shaft 40 rotates without applying excessive force to the bearings 41 and 42. Therefore, the mechanism 13 has a long life. Further, since no cup rig is used, the number of parts is reduced, the cost is reduced, and the size is reduced. Furthermore, since it has a unitized structure, it is easy to assemble, and it can be assembled more accurately, which is advantageous in assembly.

The above-described unitized magnetic head transfer mechanism 13 includes the guide rod 21 of the lead screw shaft 40.
U-shaped frame 4 with parallelism adjusted to
The connection base portion 43c of the connection base 43 of No. 3 is fixed to a predetermined portion of the frame 11 of the apparatus 10 with screws 47a and 47b.

Reference numeral 49 is an L-shaped pressing spring, which is fixed to the chassis 11 with a screw 50 (see FIG. 5).
A resin bearing member 51 is attached to the tip. The lead screw shaft 40 includes a bearing member 51 at the tip of the protrusion 40c.
Is pressed in the direction of the arrow X ₁ by the protrusion 40b on the opposite side.
The tip of the bearing is received by the ball 52 and rotates with the displacement in the thrust direction limited.

Reference numeral 53 is an arm extending from the carriage main body 18, and a pressing spring 54 is positioned on the upper surface thereof by a pair of pins 55a and 55b and is clamped from above by a material 56 pressed and fixed by a screw 57. I am doing it.
Further, the ball 58 is inserted in the hole 54a on the front end side of the pressing spring 54.
Are partially fitted as shown in FIG.

As shown in FIG. 7, the extension portion 53a on the distal end side of the arm portion 53 and the pressing spring 54 are connected to each other by the lead screw shaft 40.
8, the ball 58 is spring-biased by the pressing spring 54 in the direction of arrow Z ₂ as shown in FIG. 8 and is fitted into the screw groove 40a- _{1 having} a V-shaped cross section without any play. ing.

When the stepping motor 47 is driven, the lead screw shaft 40 directly rotates, and the balls 58 are constrained by the screw grooves 40a- ₁ while the arrows X ₁ , X
_It is displaced in _two directions and the magnetic head 17 is transferred. Here, the lead screw shaft 40 rotates while the displacement in the thrust direction is regulated, and the ball 58 and the screw groove 40
Since there is no backlash between the magnetic head 17 and a- ₁ , the magnetic head 17 can be accurately moved back and forth.

The magnetic head transfer mechanism is not limited to the above-mentioned embodiment, and for example, the rotor and the stator are U-shaped.
The stepping motor may be provided inside the upright wall of the U-shaped frame and may be arranged inside the U-shaped frame.

[0030] The present devised is not limited to the transfer of the magnetic head can also be used to transport the optical head, for example, attached to a compact disk device.

[0031]

As described above, according to the head transfer mechanism of the present invention, since the lead screw portion is integral with the motor shaft, the lead screw portion is a member separate from the motor shaft, and both are connected by the coupling. Compared with the above configuration, the structure can be simplified and the motor can be easily assembled to the device. Also, a second shaft that supports the tip side of the motor shaft.
Since the receiver is integrated with the motor, the motor device
The effect of assembly error when mounting on the lead screw is
There is no possibility of reaching the rotation accuracy, and therefore the lead screw portion can always be rotated with high accuracy, and the head such as the magnetic head can be transferred with high accuracy. Further, since the arm portion and the pressing spring elastically sandwich the lead screw portion, there is no need to specially provide a structure for preventing backlash, and from the one end side of the lead screw portion. Without mating
The carriage main body can be freely connected to a position in the middle of the lead screw portion, and therefore, the assembly for connecting the carriage main body to the lead screw portion can be performed with both end sides of the lead screw portion being supported. Thus, as compared with the structure using a nut, it can be a structure simple and can be carried out assembly work easier.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic head transfer mechanism of the present invention.

FIG. 2 is an exploded perspective view showing the magnetic head transfer mechanism of FIG. 1 together with a carriage.

FIG. 3 is a perspective view showing a floppy disk device to which the magnetic head transfer mechanism of FIG. 1 is applied together with a floppy disk cartridge.

FIG. 4 is a plan view of the floppy disk device of FIG.

FIG. 5 is a bottom view of the floppy disk device of FIG.

FIG. 6 is a plan view of the floppy disk device in a disk cartridge mounted state.

7 is a vertical sectional side view of the floppy disk device of FIG.

FIG. 8 is an enlarged view showing a fitted state of a ball in a screw groove.

FIG. 9 is a diagram showing an example of a conventional motor.

[Explanation of symbols]

10 Floppy Disk Device 12 Head Carriage 13 Magnetic Head Transfer Mechanism 17 Magnetic Head 22 Floppy Disk Cartridge 24 Floppy Disk 31 Disk Drive Motor 40 Lead Screw Shaft 40a Lead Screw Parts 40b, 40c Projection 41 First Bearing 42 Second Bearing 43 Frames 43a and 43b Vertical wall 43c Connection base portion 44 Rotor 45 Stator assembly 47 Stepping motor 49 L-shaped pressing spring 51 Bearing member 52 Ball 53 Arm portion 54 Pressing spring 56 Pressing member 58 ball

Claims (1)

[Scope of utility model registration request] 1. A head transfer mechanism having a carriage body having a head and a motor , wherein the motor is a circle.
Cylindrical stator assembly and assembly in the stator assembly
And the rotor is fixed to one end of the inserted rotor,
It projects outward from the stator assembly and its rotation
Reed disk having screw groove for transferring transferred object
Motor shaft with integrated Liu section and first bearing incorporated
One vertical wall, which is enclosed, and a second bearing are installed
The other vertical wall, the one vertical wall, and the other vertical wall
And a connecting base portion between the one vertical wall
Fixedly attached to the stator assembly,
Bearings support the part of the motor shaft near the rotor.
And the second bearing supports the tip side of the motor shaft.
The carriage body has a structure including a substantially U-shaped frame , and the carriage body has a structure having an arm portion and a pressing spring, and the arm portion and the pressing spring elastically move the lead screw portion. A head transfer mechanism characterized by being sandwiched and fitted into the screw groove.