JPH06290559A - Head assembling body for disk device - Google Patents

Abstract

PURPOSE:To attain reduction in cost. CONSTITUTION:A spring mounting piece 74 in which the winding wire part 69a of a torsion spring 69 rocking and pressing a head arm 65 in a direction along which a second head 64 gets near a first head 62 is mounted is provided integrally to a press plate 72. Thus, a head carriage 60 and the head arm 65 are integrated into one body by the press plate 72 and the winding wire part 69a of the torsion spring 69 rocking and pressing the head arm 65 is mounted on the head carriage 60 by the spring mounting piece 74 being integrated with the press plate 72. Thus, the number of parts and assembly man-hours are reduced since a single members not only functions as a press plate but also functions as the mounting piece of the torsion spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive head assembly suitable for use in, for example, a floppy disk drive.

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in office computers, word processors, etc., including personal computers, and their spread is remarkable.

Conventionally, this type of disk device is constructed, for example, as shown in FIG.

This will be described with reference to FIG. 1. In FIG. 1, a reference numeral 1 is a chassis containing a spindle motor shaft 2 as a disk rotation center, and is a device housing (not shown) such as a personal computer. ), The whole is formed by a bottomed box having a storage space 1a that is open to the front and faces the disk cartridge 3. On the rear right side of the bottom surface of the chassis 1, a holding wall 4 having a through hole 4a opening in the front-rear direction and a support shaft 5 juxtaposed with the holding wall 4 at a predetermined interval are provided upright. Two spring engaging pieces 6 are juxtaposed on the left and right sides of each spring in parallel with a predetermined interval. Further, on both side walls of the chassis 1, a guide groove (only the two left guide grooves are shown) 7 extending in the vertical direction is integrally provided.

Reference numerals 8 and 9 denote two pairs of protrusions arranged in parallel with each other in the front-rear direction at a predetermined interval, which are attached to the bottom surface of the chassis 1 and configured to guide a slide plate described later in the front-rear direction. There is. These pairs of stems 8 and 9
Are juxtaposed with each other at a predetermined interval in the left-right direction. Of these, the rear protrusion 9 has a conical cartridge positioning portion 9a whose outer diameter decreases toward the tip.
Is provided.

A reference numeral 10 designates a U-shaped slide plate in cross section, which has an eject button 11 for ejecting a disk cartridge on the right side of the front end edge thereof, and a U-shaped notch 12a in plan view which the spindle motor shaft 2 faces and the above-mentioned. The chassis 1 includes a bottom plate 12 having a first elongated hole 12b facing the spring locking piece 6 and two side plates 13 standing on both sides of the bottom plate 12 and facing each other with a predetermined gap.
It is installed inside so that it can move back and forth.

On the bottom plate 12 of the slide plate 10, a spring engaging member corresponding to the notch 14 and the second elongated hole 15 and the spring locking piece 6 which the protrusions 8 and 9 face and extend in the front-rear direction. A stop hole 16 is provided. Further, a lock claw 17 protruding downward is attached to a rear side edge of the bottom plate 12 of the slide plate 10.

On the other hand, the bottom plate 12 of the slide plate 10 is formed with four front, rear, left and right cam grooves 18 having a slope that rises diagonally forward, and the rear of the left cam groove of these cam grooves 18 is formed. A rack 19 extending in the front-rear direction is provided in the.

Reference numeral 20 denotes two tension coil springs for urging the slide plate 10 forward, and both ends thereof are locked to the spring locking pieces 6 and the spring locking holes 16, respectively.

Reference numeral 21 denotes a trigger arm having an engaging surface 21a corresponding to the lock claw 17 and a guide surface 21b, which is rotatably provided on the support shaft 5 and has a spring protruding laterally on the upper end surface. An arm operator 22 having a locking projection 22a is integrally provided.

Reference numeral 23 is a torsion spring that urges the trigger arm 21 to rotate in a direction in which the slide plate 10 is locked. A winding portion is provided around the support shaft 5, and both ends thereof are the protrusions. 22a and the holding wall 4 are engaged.

A stepping motor 24 for feeding the head carriage is fixed to the rear end portion of the chassis 1. An output shaft 25 of the stepping motor 24 is formed by a lead screw shaft extending in the front-rear direction and having a spiral V-shaped groove 25a, and a tip portion of the output shaft 25 is formed in a through hole 4a of the holding wall 4 (see FIG. (Not shown).

Reference numeral 26 denotes a guide shaft extending in the front-rear direction, which is held at the rear center of the chassis 1 and is configured to guide the head carriage described later in the front-rear direction.

27 is a needle pin 2 projecting obliquely rearward
8 and a head carriage having a leaf spring 29 that presses the needle pin 28 against the groove wall in the V-shaped groove 25a of the output shaft 25. The head carriage is held above the chassis 1 so as to be able to move forward and backward. Is provided with a shaft hole (not shown) through which the guide shaft 26 is inserted via a bush (not shown). On the upper surface of the tip of the head carriage 27, the first head 3 for reading the recorded information on the disk is read.
0 is held, and the first head 3 is attached to the rear upper end.
Head arm 32 having second head 31 corresponding to 0
Is attached via an elastic body 33 so as to be swingable.
In the head arm 32, the second head 31 has the first
A torsion spring 34 is provided in the direction of approaching the head 30.
The arm 32 is integrally biased by one side edge and is provided with a stopper 32a for restricting arm rotation protruding laterally.

Reference numeral 36 denotes a cartridge holder that holds the disc cartridge 3 so that the disc cartridge 3 can be inserted and removed. The cartridge holder 36 is provided in the slide plate 10 so as to be movable up and down. Rollers 37 as convex portions facing the cam grooves 18 and the guide grooves 7 are rotatably held at both side ends of the cartridge holder 36, and the upper end portion is open at both side edges at one side edge. A cut-and-raised piece 38 having a locking hole 38a is provided. The cartridge holder 36 is
By pressing the disk cartridge 3 against the arm operator 22, the lock claw 17 and the engaging surface 21
a is disengaged and the slide plate 10 moves forward to approach the bottom plate 12, while the eject button 1
It is configured to be separated from the bottom plate 12 by the rearward movement of the slide plate 10 by pressing 1.

Reference numeral 39 denotes an arm for opening and closing the shutter 3a of the disc cartridge 3, which is rotatably provided at the rear side edge of the upper end portion of the holder 36. A locking piece 40 protruding upward is integrally formed with the arm 39.

Reference numeral 41 is a coil spring for tensioning which gives the arm 39 a habit of returning, and both ends thereof are the locking pieces 4.
0 and is locked in the locking hole 38a.

Reference numerals 42 and 43 denote a switch for detecting the type (2DD, 2HD, 2ED) of the disk (not shown) and a switch for detecting whether or not the disk (not shown) can be written, and a board 44 on the chassis 1. Is installed through.

Reference numeral 45 designates a gear 46 which meshes with the rack 19.
And a reduction gear mechanism having a rear end portion side edge of the chassis 1.

Numerals 47 and 48 are positioning recesses provided in the case 3b of the disk cartridge 3 for the projections 9 to come in and out.

[0021]

By the way, in the head assembly of this type of disk device, the head arm 32 is swingably held by the head carriage 27, and the second head 31 approaches the first head 30. Since the head arm 32 is urged to rotate in the direction of rotation, the torsion spring 34 is attached to the holding plate P and the head carriage 27 for integrating the head carriage 27 and the head arm 32 as shown in FIG. Therefore, two parts of the spring mounting piece S are required. As a result, there has been a problem that not only the number of parts but also the number of assembling steps increase, resulting in high cost.

The present invention has been made in view of the above circumstances, and provides a disk device capable of reducing the number of parts and the number of assembling steps, thereby achieving cost reduction.

[0023]

DISCLOSURE OF THE INVENTION A disk device according to the present invention has a head carriage which has a first head at its tip and is moved forward and backward by the drive of a motor, and is attached to the base end of the head carriage by a pressing plate. An elastic body having an elastically deformable arm attachment portion and a head arm having a second head fixed to the arm attachment portion of the elastic body and corresponding to the first head are provided. A spring mounting piece for mounting a winding portion of a torsion spring that swings and urges in a direction approaching one head is integrally provided on a holding plate.

[0024]

In the present invention, the head carriage and the head arm are integrated by the pressing plate, and the winding portion of the torsion spring for biasing the head arm to swing is attached to the head carriage by the spring mounting piece.

[0025]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is an exploded perspective view showing the head assembly of the disk device according to the present invention as seen from diagonally above, FIG.
Is an exploded perspective view showing a state in which the head assembly of the disk device according to the present invention is viewed obliquely from below, and in the figures and below, the same members as those in FIG.
Detailed description is omitted. Further, in the description of the same embodiment, the same reference numerals are used for the same members as those used in the description of the conventional example.

In FIG. 1, a reference numeral 60 designates a synthetic resin head carriage which advances and retreats when the stepping motor 24 is driven, and is held above the chassis 1. On the lower left side of the head carriage 60, there is integrally provided a retainer 61 having a shaft hole 61a which opens in the front-rear direction (carriage advancing / retracting direction) and through which the guide shaft 26 is inserted via a bush B. The recessed portion 60a that opens downward and to the left and right, and this recessed portion 60a
A positioning protrusion 60b is formed so as to protrude downward from the inner bottom surface (upper surface).

Further, on the upper end surface of the front end portion of the head carriage 60, the first recording information on the disk is read.
The head 62 is held, and an extending piece 63 protruding rightward is integrally formed on the rear right side portion. And
On the upper side of the base end portion of the head carriage 60, the first
A head arm 65 having a second head 64 corresponding to the head 62 is swingably attached via an arm attachment portion 66a of an elastic body 66.

Numerals 60a and 60b are positioning protrusions integrally formed on the upper side of the base end portion of the head carriage 60 and protruding upward.

On one left side edge of the head arm 65, an arm rotation restricting stopper 67 is integrally formed so as to project to the left side. The stopper arm 67 projects upward at the central portion in the width direction of the upper end surface and is predetermined in the left-right direction. Two spring engaging portions 68 facing each other with a space are integrally formed. The head arm 65 is swingably biased by a torsion spring 69 in a direction in which the second head 64 approaches the first head 62.

Reference numeral 70 denotes an inverted trapezoidal-shaped contactor having a corner portion 70a which engages with a groove wall (not shown) in the V-shaped groove 25a and has a substantially trapezoidal shape in cross section. It is integrally formed in the central portion and is configured to be able to receive the rotational force of the output shaft 25 by driving the stepping motor 24. On the lower end surface of the contact 70, a protrusion 71 capable of sitting on a jig (not shown) for sticking a head chip is integrally formed. As a result, both supports (not shown) of a jig (not shown) for attaching the head chip
The vertical distance from one support (the horizontal center line of the bush B) to the other support (the supported point of the protrusion 71) is 6.
The size is set to 30 mm. The surface of the contactor 70 including the protrusion 71 is applied with a fluorine solution.

Reference numeral 72 denotes a holding plate having a substantially rectangular shape in plan view, which is fixed to the upper surface of the base end portion of the head carriage 60 by a screw 73 via the elastic body 66, and the left and right edges of the protrusions 60a, 60b. Through hole 72a for positioning
And a notch 72b.

On the left side of the front edge of the pressing plate 72, a rising portion 74a protruding upward and a rising portion 7a are formed.
4a, a spring mounting portion 74b protruding rightward, and a spring insertion portion 74c that is bent from the spring mounting portion 74b toward the head side to guide the spring winding portion 69a of the torsion spring 69 when the spring is mounted. A spring mounting piece 74 is integrally provided.

Further, a plurality of spring locking grooves 75a corresponding to the spring locking portions 68 are provided at the center of the rear edge of the pressing plate 72 and face the spring mounting portion 74b of the spring mounting piece 74. Spring locking piece 75
Is bent and formed.

Reference numeral 76 is a leaf spring having a substantially V-shaped cross-section, the tip of which faces the inside of the retainer 61 and the inner peripheral surface of the bush B on the outer peripheral surface of the guide shaft 26 in two directions, a horizontal direction and a vertical direction. And a first spring portion 76a that is pressed against the first spring portion 76a. The tip end portion of the first spring portion 76a faces the extending piece 63 and is connected to the outer peripheral surface (groove wall of the V-shaped groove 25a) of the output shaft 25. Contact 7
And a second spring portion 76b that is in pressure contact with 0.
It is fixed to the bottom surface of 0a by screws 77.

Both spring portions 76a, 76b of the leaf spring 76.
At the tip of the first spring portion 76a, the guide shaft 2
A protrusion 78 that abuts the outer peripheral surface of 6 is integrally formed. Further, inclined pieces 79 and 80 are formed at the tip end of the first spring portion 76a by projecting to both sides and facing the opening plane of the bush B by bending to the opposite pressure contact side.

On the other hand, the second spring portion 76b of the leaf spring 76.
Is provided with a screw insertion hole 81 opening to the front and back surfaces. The second spring portion 75b has the protrusion 60b.
A locking piece 82 having a positioning hole 82a through which is inserted is formed.

In the head assembly of the disk device constructed as described above, the head carriage 60 and the head arm 65 are integrated by the pressing plate 72, and a torsion spring for biasing the head carriage 60 to rotate the head arm 65 is provided. The spring winding portion 69a of 69 is mounted.

Therefore, in this embodiment, not only the single member functions as the pressing plate but also the mounting piece of the torsion spring 69.
The number of parts and the number of assembly steps can be reduced.

Further, in this embodiment, the spring insertion portion 74c for guiding the spring winding portion 69a of the torsion spring 69 is bent and formed on the head side in the holding plate 72, which means that the spring winding portion 69a is mounted when the spring is mounted. Can be easily inserted into the spring insertion portion 74c.

Next, the procedure for attaching the torsion spring to the holding plate and the head arm of the head assembly according to the present invention will be described with reference to FIGS. 3 (A) to 3 (C).

First, as shown in FIG. 3A, the spring winding portion 69a of the torsion spring 69 is inserted into the spring insertion portion 74c of the spring mounting piece 74, and one end of the torsion spring 69 is attached to both spring locking portions. Make it between 68.

Next, as shown in FIG. 7B, the spring winding portion 69a is attached to the spring mounting portion 7 of the spring mounting piece 74 while holding the other end portion of the torsion spring 69.
Move to 4b and put it on.

Then, as shown in FIG. 7C, the other end of the torsion spring 69 is locked in the spring locking groove 75a of the spring locking piece 75.

In this way, the torsion spring can be attached to the holding plate and the head arm.

In this embodiment, the guide width of the spring insertion portion 74c is shown to have the same dimension at any position in the spring insertion direction, but the present invention is not limited to this and the spring is not limited thereto. By setting the guide width of the insertion portion (not shown) to be narrower toward the tip, it is easier to insert the spring winding portion 69a of the torsion spring 69 into the spring insertion portion (not shown). Can be done.

Further, in the present embodiment, the example applied to the floppy disk device has been shown, but the present invention is not limited to this and can be applied to other disk devices as in the embodiment.

[0048]

As described above, according to the present invention, the head carriage which has the first head at its tip portion and which moves forward and backward by the drive of the motor, and the elastic portion which is attached to the base end portion of the head carriage by the pressing plate. An elastic body having a deformable arm attachment portion and a head arm having a second head fixed to the arm attachment portion of the elastic body and corresponding to the first head are provided, and the head arm is the first head.
Since the spring mounting piece for mounting the winding part of the torsion spring that swings and urges in the direction approaching the head is provided integrally with the pressing plate, the head carriage and head arm are integrated by the pressing plate, and the spring mounting A torsion spring for biasing the head arm to swing is attached to the head carriage by one piece.

Therefore, since the single member functions not only as the holding plate but also as the mounting piece of the torsion spring, the number of parts and the number of assembling steps can be reduced and the cost can be reduced. be able to.

In the second aspect, the spring insertion portion for guiding the spring winding portion of the torsion spring is bent and formed on the head side in the pressing plate, which means that the spring winding portion is inserted into the spring insertion portion when the spring is attached. Since it can be easily performed, the work of mounting the torsion spring can be simplified.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a state in which a head assembly of a disk device according to the present invention is viewed obliquely from above.

FIG. 2 is a perspective view showing a state in which the head assembly of the disk device according to the present invention is also seen obliquely from below.

3A to 3C are perspective views shown for explaining a spring mounting procedure of the head assembly of the disk device according to the present invention.

FIG. 4 is an exploded perspective view showing a conventional disk device.

FIG. 5 is a perspective view showing a state in which a head assembly of a conventional disk device is viewed obliquely from above.

[Explanation of symbols]

 60 ... Head carriage 62 ... First head 64 ... Second head 65 ... Head arm 66 ... Elastic body 66a ... Arm mounting portion 69 ... Torsion spring 69a ... Spring winding portion 72 ... Press plate 74 ... Spring mounting piece

Claims (3)

[Claims] 1. A head carriage that has a first head at its tip and moves forward and backward by driving a motor, and an elastic body having an elastically deformable arm attachment portion attached to a base end portion of the head carriage by a pressing plate. A head arm having a second head fixed to the arm attachment portion of the elastic body and corresponding to the first head, and swinging the head arm in a direction in which the second head approaches the first head. A head assembly of a disk device, wherein a spring mounting piece for mounting a winding portion of a biasing torsion spring is integrally provided on the pressing plate. 2. The head assembly for a disk device according to claim 1, wherein a spring insertion portion for guiding the winding portion of the torsion spring is bent and formed on the head side of the spring attachment piece. 3. The head assembly of a disk device according to claim 2, wherein the spring guide width of the spring insertion portion is set to a dimension that narrows toward the tip.