JP2537317Y2 - Head carriage mechanism of floppy disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a head carriage mechanism of a floppy disk drive.

(Prior Art) Generally, a floppy disk device has a magnetic head at the tip of a carriage, and a head arm on which a magnetic head facing the magnetic head is mounted above the carriage, and applies pressure to the head arm. In addition, a pressing spring is provided to press the head against the disk.

Here, when a torsion spring is used as the pressing spring, walls are conventionally provided on both sides of the pressing spring distal end, which is the contact portion of the pressing spring with the head arm, so that the pressing spring distal end does not come off the head arm. And a slight gap is provided between both sides of the distal end of the pressing spring and the wall. This is because when both sides of the tip of the push spring and the wall are in contact with each other without any gap, the tip of the push spring is sandwiched by both walls, and the head arm is opened and closed up and down. In addition, the opening and closing of the head arm is not performed smoothly, and in mass production, providing walls that are in contact with both side surfaces of the distal end portion of the push spring without any gap increases accuracy in terms of cost. A slight gap is provided between the distal end portion of the push spring and the walls on both sides, for example, because it is difficult to insert the distal end portion of the push spring between the walls on both sides.

(Problems to be solved by the present invention) However, since a gap is provided between the tip of the push spring and the wall, the tip of the push spring can move freely between the tip and the wall. When an external force greater than the frictional force generated by the pressing spring is applied from the side to the abutting part, the tip of the pressing spring moves in the direction of the external force, and the pressing force and contact posture of the head against the disk changes. However, there is a disadvantage that the alignment changes.

Therefore, an object of the present invention is to prevent a contact portion of a pressing spring with a head arm from moving due to a lateral external force during loading, and to always obtain a stable pressing force and a stable contact posture.

(Means for Solving the Problems) The present invention has the following configuration in order to solve the above problems.

A carriage base, a head arm rotatably supported by the carriage base, a magnetic head mounted on the distal end of the carriage base and the head arm so as to face each other, and a top surface of the head arm. A head carriage mechanism of a floppy disk drive having a torsion spring that contacts and presses the head arm toward the carriage base in a rotating direction, wherein the head arm has a groove formed on an upper surface thereof for engaging the torsion spring. The opposing side surfaces of the groove have slopes that spread upward in a substantially V-shape, and the torsion spring is in contact with and engaged with only the two slopes. Carriage mechanism (operation) In the present invention, the torsion spring is brought into contact with and engaged with only both slopes that spread in a substantially V shape. Never deviate abutment of the torsion spring even when an external force is applied from the lateral direction by Rukoto.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, a conventional floppy disk drive will be described with reference to FIGS. Reference numeral 1 denotes a magnetic disk, which is rotated by a spindle motor 2. Reference numeral 6 denotes a carriage on which the magnetic head 3 is provided via a support sheet 5. The head arm 8 is moved from a seat at the rear end of the carriage 6 to a leaf spring 10.
And is rotatable up and down with respect to the carriage 6. A magnetic head 4 is provided at a tip portion of the head arm 8 at a position facing the magnetic head 3 provided on the carriage 6 side via the support sheet 7. A push spring 9 is provided on the seat 6 a of the carriage 6, and the distal end thereof is brought into contact with a push spring detachment preventing member 12 described below,
The magnetic head pushes the head arm 8 toward the disk in order to appropriately press the disk 1. Here, the pressing spring 9 is a torsion spring. The pressing spring 9 is provided at the contact portion of the pressing spring 9 with the head arm 8.
A U-shaped push spring detachment preventing member 12 having a vertical wall is provided on both sides of the distal end portion 9a of the push spring 9 so that the push spring 9 does not come off. Spring 9 so that the movement of
The wall is provided so as to have a width wider than the diameter of the cross section of the distal end portion 9a. However, according to the above configuration, when an external force is applied from the side, the contact portion of the pressing spring 9 with the head arm 8 shifts, and the pressing force and the contact posture of the magnetic head against the disk change.

Next, the head carriage of the floppy disk drive of the present invention will be described with reference to FIGS. In FIGS. 1 to 3, the same parts as those in FIGS. 4 to 6 are denoted by the same reference numerals, and description thereof will be omitted.

The pressing spring 9 is a seat portion of the carriage 6 at the coil portion.
6a is held by being fitted to a holding portion provided on the upper surface, one end of which is locked by the seat portion 6a, and the other end of which abuts against the push spring release prevention member 13 to push in a direction perpendicular to the disk surface. Apply pressure. The push spring disengagement prevention member 13 has a groove on the upper surface, and the center of the groove is located on the axis passing through the center of the head substantially in the traveling direction of the head carriage, and as shown in FIG. The inclined surface having the same inclination angle from the center of the circle extends right and left to form a V-shaped groove. The distal ends of the pressing springs 9 are respectively fitted to the V-shaped left and right inclined surfaces and fitted into the grooves, and the contact angles are symmetrical about the direction perpendicular to the disk surface. Therefore, the same pressing force is applied to each contact portion in a direction perpendicular to the disk surface. At this time, when an external force is applied from the side, a force tends to act on the abutting portion in a direction to push up the push spring 9 along the inclined surface, but a force to push down the push spring 9 along the inclined surface acts. Therefore, the contact portion of the pressing spring 9
There is no shift. In addition, since the groove is widened in a V-shape with respect to the forward and backward movement of the distal end of the push spring 9 when opening and closing the head arm 8 up and down, the distal end 9a of the push spring 9 is sandwiched between the walls on both sides. And can smoothly move on the V-shaped groove. The shape of the groove is not limited to the V-shape, and the oblique side of the V-shape may be an arc instead of a straight line. In addition to providing members having these shapes,
A wall may be provided on the head arm to have these shapes, or a groove may be dug.

(Effect) As described above, according to the present invention, since the contact portion of the pressing spring with the head arm is positioned, even if external force is applied from the lateral direction during loading, the pressing spring contacts the head arm. The contact portion does not shift, the head can always obtain a stable pressing force and contact posture with respect to the disk, and the opening and closing of the head arm is also the contact portion of the pressing spring with the head arm. The tip is 2
Since it is a point of contact, the frictional force is small, and it is not sandwiched by the walls located on both sides of the tip. Arms open and close smoothly. Furthermore, if the shape is the same, there may be some error, it is inexpensive at the time of mass production, and the push spring is easily fitted in the assembling process so that accurate positioning can be easily performed, thereby improving workability. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of a floppy disk device according to the present invention, FIG. 2 is a front view of a portion of the present invention of the floppy disk device, and FIG. 3 is another embodiment in FIG. 4, FIG. 4 is a partially cutaway side view of the conventional floppy disk device, FIG. 5 is a partial perspective view of the conventional floppy disk device, and FIG. It is a front view of a contact part. (1) Disk, (2) Spindle motor (3) First magnetic head (5) First support sheet (6) Carriage (6a) Seat (8) ) Head arm (9) Push spring (9a) Tip end of push spring (10) Leaf spring (11) Slide guide (12) (13) Push spring detachment prevention member

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-103481 (JP, A) JP-A-1-116955 (JP, A) JP-A-62-172557 (JP, A) JP-A-61-172557 151826 (JP, A) Actually open 63-138669 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A carriage base; a head arm rotatably supported by the carriage base; magnetic heads mounted on the carriage base and a tip of the head arm so as to face each other; A torsion spring for abutting against the upper surface of the arm and pressing in the direction of rotation of the head arm toward the carriage base. A head carriage mechanism of a floppy disk drive, wherein the head arm has a groove on the upper surface with which the torsion screw is engaged. Are formed, and both opposing side surfaces of the groove have upwardly inclined slopes which expand in a substantially V-shape, and the torsion spring is brought into contact with and engaged with only both slopes. Head carriage mechanism for disk drive