JPH0731419Y2 - Arm support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a head arm supporting device for a head carriage of a disk drive device for recording / reproducing information by rotationally driving an information recording disk.

[Conventional technology]

For example, a magnetic arm assembly head arm (hereinafter,
There are two types of supporting devices (abbreviated as “arm”), one of which is a type that uses a leaf hinge spring to swingably support the arm, and the other is a type that uses a shaft to swingably support the arm. ing. Among them, the one using a leaf hinge spring is widely used at present because the gear position of the upper and lower magnetic heads can be adjusted when the arm is attached to the carriage after the head is attached.

On the other hand, the shaft-supporting type is not used so much because it is difficult to adjust the gear up, but there is no possibility that the posture of the arm is changed by the elastic deformation of the leaf hinge spring or the leaf hinge spring resonates. It is being reviewed again.

An example of this type of shaft support is, for example, JP-A-58-19665.
Some are disclosed in Japanese Patent Publication No. 7.

The head arm supporting device disclosed in Japanese Patent Laid-Open No. 58-196657 supports the head arm with respect to the frame-shaped supporting device so as to be swingable by a pivot shaft, and maintains a contact relationship between the pivot shaft and the bearing. Elastic urging means for

[Problems to be solved by the invention]

Therefore, in order to support the pivot, in the above-mentioned conventional example,
In addition to the pivot shaft, a bearing and elastic biasing means for maintaining the abutting relationship are required, resulting in a complicated structure.

The present invention has been made in view of the above technical background, and an object thereof is to provide an arm supporting device having a simple structure.

[Means for solving problems]

In order to achieve the above object, the present invention provides an arm supporting device for supporting an arm carrying an upper head device with respect to a carrying carrier carrying a lower head device, and standing up substantially parallel to the arm supporting side of the carriage. A pair of elastically deformable thin plates having the first mounting hole formed therein, and a pair of elastically deformable thin plates having the second mounting hole formed substantially parallel to the arm. And a support shaft that is inserted into the first and second mounting holes that are concentrically arranged and that pivotally supports the arm so that the arm can swing. , A pair of abutting portions having a diameter larger than that of the shaft body and provided at both ends of the shaft body, wherein the abutting portions are parallel to at least one of the pair of arm mounting plates and the pair of mounted plates. Those who bring a pair of flat plates close to each other A first inclined surface which is elastically deformed and the attachment holes and strong fitting formed in the plate piece and its elastic deformation,
It is characterized by having a mounting hole formed in the other plate piece and a second inclined surface that slides.

[Action]

According to the above means, the arm attachment plate on the carriage side and the plate to be attached to the carriage side on the arm side are respectively elastically deformable, and the spindle is provided in the first and second attachment holes formed in both of them. By inserting and applying pressure to at least one of the arm mounting plate and the plate to be mounted via the abutting portions at both ends of the spindle, the abutting portion of the spindle is at least pressed. The arm can be swingably supported with respect to the carriage without being strongly fitted to the given side and swinging with the other side to cause misalignment.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 to 16 are for explaining a magnetic head assembly according to an embodiment. FIG. 1 is a side view of the magnetic head assembly, FIG. 2 is a rear view of the magnetic head assembly, and FIG. 3 is a carriage. 4 is a plan view of the arm, FIG. 4 is a plan view of the arm, FIG. 5 is a plan view of the arm, FIG. 6 is a rear view thereof, FIG. 7 is a side view of the same, and FIG. 8 is a plan view of a magnetic head unit. Is an explanatory view showing a mounting state of the shield plate and the magnetic head, FIG. 10 is an explanatory view showing an engaging state of the follower and the screw shaft, FIG. 11 is a front view of the follower, and FIG. 12 is a holding spring portion of the follower. Fig. 11 is a view of the main part M, showing Fig. 13, Fig. 13 is a bottom view of the follower,
FIG. 14 is a front view showing a disassembled support shaft, FIG. 15 is a bottom view of a main part showing a state in which a magnetic head unit is attached to a carriage, and FIG. 16 is a cross-sectional view of the main part.

In FIGS. 1 and 2, a magnetic head assembly 1 is equipped with a lower magnetic head unit 2, and a carriage 4 is linearly moved along a guide shaft 3 in the radial direction of a magnetic disk, and an upper magnetic head unit. An arm 7, which is also referred to as a hold case, is mounted on the carriage 4 so as to be swingable with respect to the carriage 4 via a support shaft 6, and is disposed between the rear end of the arm 7 and the carriage 4. It is mainly composed of a coil spring 8 which elastically biases the head units 2 and 5 in directions toward each other.

As shown in FIGS. 3 and 4, the carriage 4 includes a board 9 and a pair of arm mounting plates 10 provided upright on both edges of the board 9.
a, 10b, a follower mounting plate 12 to which a follower 29 described later is attached, and a guide shaft insertion portion 13 that is inserted into the guide shaft 3 are integrally formed by bending a thin aluminum alloy plate. I am doing it.

Further, on the left end side of the substrate 9 in the drawing, a pair of bifurcated parallel lower magnetic head unit 2 mounting portions 14 are formed. The arm mounting plates 10a and 10b are elastic and are formed in a slightly opened shape and substantially parallel to each other, and mounting holes 15 into which the support shaft 6 can be inserted are formed in a direction perpendicular to the longitudinal direction of the substrate 9. . The mounting hole 15 is chamfered like a dish, and has a contact portion 31 (described later) of the support shaft 6 having a similar inclination.
The slanted surfaces 31b and 32b of c and 32c come into contact with each other, and both arm mounting plates 10a and
While elastically deforming 10b toward each other,
The inclined surfaces 31b, 32b and the mounting hole 15 are set to swing.

The follower mounting plate 12 extends outward from the lower arm mounting plate 10a in FIG. 3 in parallel with the substrate 9, and has three protrusions 16 on the follower mounting portion 12a at the tip thereof as shown in FIG. It projects downwards as shown.

The guide shaft insertion portion 13 is composed of a plate piece cut and raised downward along the longitudinal centerline of the substrate 9, and has a shaft insertion hole 13a formed at the center thereof.
The guide shaft 3 is inserted through the guide shaft 3 to regulate the movement direction of the carriage 4. Further, a protrusion 17 is formed on the upper surface of the substrate 9 to regulate the position of the lower end side of the coil spring 8.

As shown in FIGS. 5 to 7, the arm 7 has a base plate 18 having an inclined surface 18a formed in a central portion thereof, and a pair of carriages 4 provided upright on both edges of the inclined surface 18a. Boards 19a, 19b
And a mounting portion 20 for mounting the above magnetic head unit 5
And a protruding piece 21 for opening and closing the arm 7, and is integrally formed by bending a thin plate made of the same aluminum alloy as the carriage 4.

The attachment plates 19a and 19b are formed in a slightly opened shape and are substantially parallel to each other, and an attachment hole 22 having a smaller diameter than the attachment hole 15 formed in the arm attachment plates 10a and 10b is formed. A cross-shaped kerf 23 is formed in the mounting hole 22, and the mounting hole 22
The inner surface of the is chamfered like a dish. The distance between the attached plates 19a, 19b, that is, the width of the inclined surface 18a portion of the substrate 18 is formed narrower than the inner dimension of the arm attaching plates 10a, 10b of the carriage 4, and is formed on the inner surfaces of the arm attaching plates 10a, 10b. Mounted plate 19a, 19b
The outer surfaces of the can be opposed.

The mounting portion 20 of the upper magnetic head unit 5 formed at the left end of the board 18 in FIGS.
The lower magnetic head unit 2 is formed in the same shape as the lower magnetic head unit 2, and both of them can be mounted by inserting the unit from the open end of the mounting portion 20. Further, a protrusion 24 for restricting the position of the coil spring 8 on the side of the arm 7 faces the protrusion 17 on the side opposite to the upper magnetic head unit mounting side of the substrate 18, that is, on the lower surface on the right end side in FIGS. 5 and 7. Is installed vertically.

As shown in FIGS. 8 and 9, the upper magnetic head unit 5 has a read / write lead / write gear formed therein.
Magnetic head 25 consisting of a head slider including a light core
Is bonded to the central spring plate portion of the gimbal spring 26 having a substantially circular outer shape, and the gimbal spring 27 is attached to the lower surface in FIG. 9 of the flange portion 27 of the shield plate 27 having the bowl-shaped storage portion 27a and the flange portion 27b. A magnetic head 25, a gimbal spring 26 and a shield plate 27 are integrally formed by adhering a ring portion on the outer periphery of 26 by laser beam welding.

The shield plate 27 is formed by integrally molding an elastic body, and a hole 27c for positioning the shield plate 27 with respect to the mounting portion 20 is formed in the upper surface of the accommodating portion 27a in FIG. 8 and a gimbal spring is formed in the flange portion 27b. A positioning hole 27d for positioning with respect to 26 is formed. Corresponding to this, the ring portion 26b of the gimbal spring 26 is also formed with a positioning hole 26a having the same diameter. The shield plate 27 is further provided with a bending piece 28a formed by bending a point-symmetrical portion of the flange portion 27b by 180 degrees, and between the facing surfaces of the bending piece 28a and the flange portion 27b, A mounting groove 28 to be inserted into the mounting portion 20 is formed.
Similarly, the lower magnetic head unit 2 is also formed.

The follower 29 attached to the follower attaching portion 12a of the follower attaching plate 12 engages with the screw feed groove 30a formed on the outer periphery of the screw shaft 30 as shown in FIGS. It is used to convert the rotational movement of the Youshaft 30 into the linear movement of the carriage 4, and the feed groove
The protrusion 29a that engages with 30a and the screw shaft 30 are elastically held together with the protrusion 29a, and the feed groove 30a of the protrusion 29a is held.
It is formed by bending a stainless steel for spring integrally with a pressing spring portion 29b that prevents the stainless steel from being detached from.

The pressing spring portion 29b of the follower 29 is shown in FIGS.
As shown in FIG. 3, the base portion 29c having the protrusion 29a is bent into a V shape so as to face the protrusion 29a, and the cut-and-raised portions 29d are formed along both edges to improve rigidity. Secured and has a narrow shape. Further, a mounting / positioning hole 29e to be inserted into the protrusion 16 formed on the floor attachment portion 12a is formed in the base portion 29c at a position corresponding to the protrusion 16.

To attach the follower 29 to the carriage 4, use the protrusion 16 above.
The above-mentioned hole 29e is externally inserted to the projection 16 protruding from the base portion 29c.
This is done by crimping the part. In addition to this, laser beam welding, spot welding, or the like is used for this attachment. However, since the carriage 4 is made of an aluminum alloy and the follower 29 is made of stainless steel, the caulking is simple and effective.

As shown in FIG. 14, the support shaft 6 is composed of a pair of deformed bolts 31 and nuts 32. This bolt 31 and nut
32 includes two inclined surfaces 31a, 31b, 32a, 32b.
Abutting parts 31c, 32c having a large diameter are formed, and the inclined surfaces 31a, 32a having a small diameter, which are inside, are attached to the mounting plates 19a, 1a on the arm 7 side.
The chamfered portion of the mounting hole 22 of 9b is brought into contact with the chamfered portion 31b, 32b having a large diameter, which is the outer side, is brought into contact with the chamfered portion of the mounting hole 15 of the arm mounting plates 10a, 10b of the carriage 4 side, respectively. .

Next, the assembly of the magnetic head assembly 1 configured as described above will be described.

When assembling the magnetic head assembly 1 according to the embodiment, first, the arm 7 is positioned between both arm mounting plates 10a, 10b of the carriage 4, and the plates 19a, 19 to which the arm 7 is mounted are mounted.
Both mounting holes 15 and 22 are concentrically held by making b face each other. After that, the bolt 31 constituting the support shaft 6 is inserted into both the mounting holes 15 and 22, and the nut 32 is screwed from the other side, and, for example, a gauge that defines the interval between the mounted plates 19a and 19b of the arm 7 is mounted on both sides. Attached plate 1
Insert between 9a and 19b and tighten with the specified torque. As a result, the arm mounting plates 10a, 10b and the mounting holes 19a, 19b are elastically deformed in the direction of approaching each other, and a pressure is applied between the arm mounting plates 10a, 10b and between the mounting plates 19a, 19b, respectively.
At least three members are axially connected without play.

In this embodiment, this shaft coupling is such that a strong fit is established between the mounting holes 22 of the plates to be mounted 19a, 19b and the inclined surfaces 31a, 32a by the above tightening, and the arm 7 and the support shaft 6 are connected. And move together,
Between the mounting holes 15 of the arm mounting plates 10a and 10b and the inclined surfaces 31b and 32b, the three dimensions and the tightening torque are set so that a slidable pressurization is applied, whereby the carriage 4 is provided.
On the other hand, the arm 7 is swingably supported. in this case,
In order to ensure the slidability of the mounting hole 15 and the inclined surfaces 31b, 32b,
Needless to say, for example, grease or the like may be used. In this way, the bolt 31 and nut 32 tightened with a predetermined tightening torque are coated with an adhesive at the threaded portion so that the tightened state of both is not changed.

Subsequently, the follower mounting portion 12a of the carriage 4 axially coupled as described above is mounted with the follower 29 by caulking as described above, and is equipped with the movement direction changing device of the magnetic head assembly 1. In addition, this follower 29
The attachment may be performed before the shaft coupling step.

The magnetic head unit is then attached. The magnetic head unit is attached by first attaching the lower magnetic head unit 2 to the carriage 4. That is, the magnetic head of the lower magnetic head unit 2
The mounting groove 28 is inserted from the left side of FIGS. 3 and 4 into the mounting portion 14 with 25 directed toward the arm 7, and positioning with respect to the carriage 4 is performed by using optical means, and then shown in FIG. 2 shown by P from the surface side of the bent piece 28a.
Laser beam welding point by point. Further, the lower magnetic head unit 2 is securely attached to the attaching portion 14 by laser beam welding at two points from the side of the flange portion 27b facing the bent piece 28a. This attached state is shown in FIG.

On the other hand, the upper magnetic head unit 5 is similarly attached to the attaching portion 20 of the arm 7 after attaching the lower magnetic head unit 2. In this case, the lower magnetic head
It is necessary to mount the upper magnetic head 25 with the upper magnetic head 25 by shifting the upper or lower magnetic head 25 accurately by 4 or 8 tracks according to the standard. Visually, the upper magnetic head unit 5 is adjusted through the rod member inserted into the hole 27c, and when this adjustment is completed, laser beam welding is performed. In addition to the optical method, this adjustment may be performed by rotating the disc for position adjustment and picking up the output from the magnetic head 25. These adjustment methods are arbitrarily selected according to the working conditions.

After mounting the follower 29 and the lower and upper magnetic head units 2 and 5 as described above, the coil spring 8 for applying a load pressure is mounted between the carriage 4 and the protrusions 17 and 24 of the arm 7. In this manner, the magnetic head assembly 1 made of sheet metal, which is swingably supported by the support shaft 6 and which adjusts the gear gaps when the magnetic head units 2 and 5 are mounted on the carriage 4 and the arm 7, is manufactured. It

In the above embodiment, the contact portions 31c, 32c of the support shaft 6 are
Is set so as to be tightly fitted to the plates 7a, 19b to be mounted on the arm 7 side and slide on the plates 10a, 10b on the carriage 4 side, but it may be set to be the opposite. Needless to say. In addition, as described above, when the carrier 4 and the arm 7 are made of an aluminum alloy, the weight of the carrier assembly can be reduced, power consumption can be reduced, and the exciting voltage of the stepping motor can be quickly cut off.
The settling time can be shortened. In addition, in the above embodiment, both the carriage 4 and the arm 7 are formed by bending a plate material.
The plates 10a, 10b and the attached plates 19a, 19b may be erected by outsert molding, and the main body of the carriage 4 and the arm 7 can be appropriately selected according to the specifications.

[Effect of device]

As will be apparent from the above description, according to the present invention, one of the mounting holes for the arm mounting plate or the mounting plate for the carriage is provided by the abutting portions having the first and second inclined surfaces at both ends of the support shaft. Since the arm is swingably supported by tightly fitting with and sliding with the other, it is possible to provide an extremely simple and accurate arm supporting device.

[Brief description of drawings]

1 is a side view of a magnetic head assembly, FIG. 2 is a rear view of the same, FIG. 3 is a plan view of a carriage, and FIG. 4 is the same. A side view, FIG. 5 is a plan view of the arm, FIG. 6 is a rear view of the same, and FIG.
Figure is the same side view, Figure 8 is a plan view of the magnetic head unit,
FIG. 9 is an explanatory view showing a mounting state of the shield plate and the magnetic head, FIG. 10 is an explanatory view showing an engaging state of the follower and the screw shaft, FIG. 11 is a front view of the follower, and FIG. 12 is a view of the follower. FIG. 11 shows the presser spring portion. FIG. 11 is a main part arrow view, FIG. 13 is a bottom view of the follower, FIG. 14 is a front view showing the disassembled support shaft, and FIG. 15 is a magnetic head unit attached to a carriage. FIG. 16 is a bottom view of the main part showing the state, and FIG. 16 is a sectional view of the main part. 1 ... Magnetic head assembly, 2 ... Lower magnetic head assembly, 4 ... Carriage, 5 ... Upper magnetic head unit, 6 ... Spindle, 7 ... Arm, 10a, 10b ...
Arm mounting plate, 15,22 ... Mounting hole, 19a, 19b ... Mounting plate, 25 ... Magnetic head, 31 ... Bolt, 31a, 31b ... Slope, 32 ... Nut, 32a, 32b ... Inclined surface, 31c, 32c ……
Abutment

Claims (1)

[Scope of utility model registration request] 1. An arm support device for supporting an arm carrying an upper head device with respect to a carriage carrying a lower head device, wherein the arm support device is erected substantially parallel to the arm supporting side of the carriage.
To an arm mounting plate made of a pair of elastically deformable thin plates having a mounting hole and a pair of elastically deformable thin plates having a second mounting hole provided substantially parallel to the arm. An attached plate and a support shaft that is inserted into the first and second mounting holes that are concentrically arranged and pivotally supports the arm are provided. The support shaft includes a shaft body and a shaft body. A pair of abutting portions having a large diameter and provided at both ends of the shaft body, wherein the abutting portions are at least one pair of parallel plate pieces of a pair of arm mounting plates and a pair of mounted plates. Elastically deforming in a direction in which they approach each other, and a first inclined surface that tightly fits the mounting hole formed in the elastically deformed plate piece, and a second sliding surface that slides in the mounting hole formed in the other plate piece. And an inclined surface of the arm supporting device.