JPH0617219Y2 - Carriage transfer device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a carriage transfer device equipped with a head device, and in particular, to a follower pin and a follower spring used for conversion of a movement direction associated with the carriage transfer. The present invention relates to a carriage transfer device.

[Conventional technology]

There are two types of carriage transfer device, mainly, a screw shaft, one that uses an engaging member that engages this screw shaft, and one that uses a steel belt. Is fast but the space factor is bad, so in the pursuit of space factor,
A format using a screen shift is often adopted.

As a device using this screw shaft, there is a carriage transfer device shown in Figs. 17 and 18. FIG. 17 is a plan view of the carriage transfer device, and FIG. 18 is a front view of the same.

In both figures, the carriage transfer device includes a carriage 112 having a lower magnetic head 111 mounted thereon and a hold case 114 having an anti-magnetic head mounting end of the carriage 112 swingably supported thereon and an upper magnetic head 113 mounted thereon.
And at one edge of the carriage 112, this carriage 112
Guide shafts 115 and 1 for supporting the shaft
15 is arranged in parallel with the outer circumference of the spiral feed groove 116.
The screw shaft 117 is engraved with a screw, and a support member 120 that is protruded from the carriage 112 and supports the follower pin 118 and the follower spring 119.

The carriage 112 is slidably supported by the guide shaft 115 via a bearing 121, and is guided by the guide shaft 115.
It is free to move along the longitudinal direction.

The follower pin 118 and the follower spring 119 supported by the support member 120 are provided with a holding plate 122 and a stopper arranged on the upper side of the follower pin 118 as shown in the plan view of the essential part of FIG. 19 and the front view of the essential part of FIG. It is fixed to the upper surface and the lower surface of the support member 120 via the screws 123, respectively. The follower pin 118 is fixed in conformity with the inclination direction of the feed groove 116, and the follower spring 119 and the follower pin 118 elastically sandwich the screw shaft 117 to prevent the follower pin 118 from coming off the feed groove 116. .

One end side of the screw shaft 117 is connected to, for example, a stepping motor (not shown) and rotates in synchronization with the rotation of the stepping motor. And
When the screw shaft 117 rotates, the follower pin 118 converts the rotational motion into a linear motion, and the carriage 112 reciprocates along the guide shaft 115 according to the amount of rotation of the screw shaft 117 to move the commanded magnetic disk. Transferred to the track position.

[Problems to be solved by the invention]

By the way, in the carriage transfer position configured as described above, the feed groove 116 of the screw shaft 117 is used.
118 and the follower pin 118 that engage with the
Follower spring 11 for preventing the detachment from the feed groove 116
As is apparent from FIG. 20, the movement direction converting means composed of 9, etc., is particularly suitable for the follower pin 118 and the follower spring 11.
It is composed of four parts, that is, a pressing plate 122 and a set screw 123, and the former three members are attached to the support member 120 via the set screw 123.

Therefore, there are problems that the number of parts is large, the parts cost is high, the number of assembling steps is large, and the assembling cost is high.

In addition, in the carriage transfer device configured as described above, the screen shifter 1 synchronized with the stepping motor at the time of seeking is used.
Rotation of 17 Transmission of driving force to follower pin 118 engaging with feed groove 116 of screw shaft 117 Movement of carriage 112 Acceleration of carriage 112 Stepping motor and screw shaft 117
Inertia force acts on the carriage 112. The carriage 112 is transferred to the commanded seek position through the procedure of resting the carriage 112.

However, as apparent from the step of the seek position, the inertia force always acts on the carriage 112, and this inertia force causes a problem.

That is, when the screw shaft 117 stops at the end of transfer, an inertial force acts on the carriage 112, and the inertia force deforms the follower pin 118. Therefore, even if the screw shaft 117 stops, the carriage 112 immediately stops. It is not possible. Therefore, there is a problem that the settling time is long.

The present invention has been made in view of the above technical background, and an object thereof is to provide a carriage transfer device having a small number of parts and a short settling time.

[Means for solving problems]

In order to achieve the above object, the present invention has a carriage equipped with a head device, a guide shaft for guiding the carriage in the radial direction of the information recording disk, and a spiral feed groove formed on the outer peripheral surface of the carriage. A screw shaft which is rotatably driven via the screw shaft, an engaging device which engages with a feed groove of the screw shaft and converts the rotational motion of the screw shaft into a linear motion of the carriage along the guide shaft, and the engaging device. In a carriage transfer device including an engaging holding means for holding the engaging relationship between the feeding groove and the feed groove, the engaging means is provided by an engaging projection integrally provided on a leaf spring, The leaf springs are bent and are formed by spring pieces that sandwich the screw shaft in opposition to the engaging projections. It is summer in a fixed configuration.

[Action]

According to the above means, since the engaging means and the engaging holding means are integrally formed by the one piece of leaf spring, the number of parts is minimized, and the rear surface side of the engaging projection forming portion has high rigidity. Since the engaging projection is not directly deformed because it is directly fixed to the carriage, the followability to the rotation / rotation stop operation of the screw shaft is improved.

〔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. 5 is a plan view of the arm, FIG. 6 is a rear view of the arm, FIG. 7 is a side view of the same, and FIG.
The figure 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, and FIG. 11 is a front view of the follower. 12 and 13 are a bottom view of the follower, and FIG. 14 is a front view of the support shaft in a disassembled state. FIG. 16 is a bottom view of an essential part showing a state in which the magnetic head unit is attached to the carriage, and FIG. 16 is a sectional view of the essential 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 a direction in which they are close to each other.

As shown in FIGS. 3 and 4, the carriage 4 includes a board 9 and a pair of arm mounting plates 1 provided upright on both edges of the board 9.
0a, 10b, a follower mounting plate 12 to which a follower 29, which will be 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 board 9 in the drawing, a mounting portion 14 for a pair of parallel lower magnetic head units 2 which is bifurcated.
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 the inclined surfaces 31b and 32b of the contact portions 31c and 32c of the support shaft 6 having the same inclination, which will be described later, come into contact with each other to attach both arm mounting plates 10a. , 10b are elastically deformed in a direction in which they approach each other, and the inclined surfaces 31b, 3
2b 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 centerline of the substrate 9 in the longitudinal direction, and has a shaft insertion hole 13a formed at the center thereof, and the shaft shaft insertion hole 13a has a guide shaft insertion hole 13a. 3 is inserted to regulate the movement direction of the carriage 4. Further, on the upper surface of the substrate 9, a protrusion 17 that regulates the position of the lower end side of the coil spring 8 is provided.
Has been drilled.

As shown in FIGS. 5 to 7, the arm 7 includes a substrate 18 having an inclined surface 18a formed in the central portion thereof and an inclined surface 18a.
Plates 19a and 19b attached to the pair of carriages 4 that are erected on both edges, a mounting portion 20 for mounting the magnetic head unit 5, and a protruding piece 2 for opening and closing the arm 7.
1, and is formed integrally 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 cut groove 23 is formed in the mounting hole 22, and the inner surface of the mounting hole 22 is chamfered in a dish shape. The distance between the attached plates 19a and 19b, that is, the substrate 1
The width of the inclined surface 18a portion of 8 is formed narrower than the inner dimension of the arm mounting plates 10a, 10b of the carriage 4, and the mounting plates 19a, 19b are mounted on the inner surfaces of the arm mounting plates 10a, 10b.
The outer surfaces of b can be opposed to each other.

The mounting portion 20 of the upper magnetic head unit 5 formed on the left end of the substrate 18 in FIGS. 5 and 7 is formed in the same shape as the lower magnetic head unit 2 formed on the carriage 4, and both of them are of the mounting portion 20. The unit can be installed by inserting it from the open end. Further, a projection 24 for restricting the position of the coil spring 8 on the side of the arm 7 faces the projection 17 on the side opposite to the 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 2 consisting of a head slider including a write core
5 is bonded to the central spring plate portion of the gimbal spring 26 having a substantially circular outer shape, and the ninth portion of the flange portion 27 of the shield plate 27 is further provided with the bowl-shaped storage portion 27a and the flange portion 27b.
In the figure, a ring portion on the outer periphery of the gimbal spring 26 is adhered to the lower surface by laser beam welding to integrally form the magnetic head 25, the gimbal spring 26, and the shield plate 27.

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 26 is provided. 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 point-symmetrical portion of the flange portion 27b.
A bent piece 28a formed by bending is provided, and a mounting groove 28 to be inserted into the mounting portion 20 is formed between the bent piece 28a and the facing surface of the flange portion 27b. 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 FIG. 2 and FIG. Yushyaft 30
Is for converting the rotational movement of the carriage 4 into the linear movement of the carriage 4, and elastically clamps the projection 29a engaging with the feed groove 30a and the screw shaft 30 together with the above-mentioned projection 29a. It is formed by bending the stainless steel for spring integrally with the holding spring portion 29b for preventing the separation of the spring.

As shown in FIGS. 11 to 13, the presser spring portion 29b of the follower 29 is bent in a V shape so as to face the protrusion 29a from a base portion 29c provided with a protrusion 29a. A cut-and-raised portion 29d is formed along the edge portion to secure rigidity and form a narrow shape. Further, the base portion 29c has an attachment / positioning hole 29 which is inserted into the protrusion 16 formed on the follower attachment portion 12a.
e is provided at a position corresponding to the protrusion 16.

The follower 29 is attached to the carriage 4 by externally inserting the hole 29e into the protrusion 16 and caulking the portion of the protrusion 16 protruding from the base portion 29c. 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 includes a pair of deformed bolts 3
1 and nut 32. This bolt 31
The nut 32 and the nut 32 each have two inclined surfaces 31.
Large-diameter contact portion 31 having a, 31b, 32a, 32b
c and 32c are formed, and the inclined surface 31 having a small diameter and serving as the inner side
a, 32a contact the chamfered portions of the mounting holes 22 of the mounted plates 19a, 19b on the arm 7 side, respectively, and the inclined surfaces 31b, 32b having a large diameter on the outside are mounted on the arm mounting plates 10a, 10b on the carriage 4 side. The chamfered portions of the holes 15 are in contact with each other.

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, both arm mounting plates 10a, 1 of the carriage 4 are assembled.
The arm 7 is positioned between 0b, and the mounting plates 19a and 19b of the arm 7 are opposed to each other to hold both mounting holes 15 and 22 concentrically. 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. Insert between the plates 19a and 19b to be attached and tighten with a predetermined torque. As a result, the arm attachment plates 10a, 10b and the attachment holes 19a, 19b are elastically deformed in the direction of approaching each other, and the arm attachment plates 10a, 10b,
Pressurization is applied between 10b and between the attached plates 19a and 19b, so that at least the three members are axially coupled without play.

In this embodiment, the shaft coupling is performed by the attached plates 19a and 19b.
A strong fit is established between the mounting hole 22 and the inclined surfaces 31a, 32a by the above-mentioned tightening, and the arm 7 and the support shaft 6 move integrally, so that the mounting holes 1 for the arm mounting plates 10a, 10b are mounted.
5 and the inclined surfaces 31b and 32b, the three dimensions and the tightening torque are set so that a slidable pressurizing force is applied, whereby the arm 7 can swing with respect to the carriage 4. Supported. In this case, the mounting hole 15 and the inclined surface 3
Needless to say, grease or the like may be used to ensure the slidability of 1b and 32b. In this way, the bolt 31 tightened with a predetermined tightening torque
With respect to the nut 32, an adhesive agent is applied to 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 connected to the follower 29 as described above.
The magnetic head assembly 1 is attached by caulking and is equipped with a device for changing the direction of movement of the magnetic head assembly 1. The follower 29 may be attached 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 25 of the lower magnetic head unit 2 is directed toward the arm 7 and the mounting groove 28 is inserted into the mounting portion 14 from the left side in FIGS. 3 and 4, and the carriage 4 is positioned by using optical means. After going to the 15th
As shown in the drawing, laser beam welding is performed on each of the two points indicated by P from the front surface side of the bent piece 28a. The lower magnetic head unit 2 is surely 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, since it is necessary to mount the upper magnetic head 25 by shifting the gear cap of the upper magnetic head 25 accurately by 4 or 8 tracks according to the standard, the lower magnetic head 25 must be mounted. And visually observing the gears of the upper magnetic head 25 and connecting the upper magnetic head unit 5 to the hole 27.
Adjustment is performed via the rod member inserted in c, 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 upper 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 way, the magnetic head assembly 1 made of sheet metal, which is swingably supported by the support shaft 6 and which adjusts the gap between the gear heads 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 of the support shaft 6,
32c is set so as to be strongly fitted to the attached plates 19a and 19b on the arm 7 side and slide on the attaching plates 10a and 10b on the carriage 4 side, but even if it is set to the opposite, It goes without saying that it is good. In the above embodiment, both the carriage 4 and the arm 7 are formed by bending the plate material. However, the arm mounting plates 10a and 10b and the mounted plates 19a and 19b are erected on the synthetic resin material by outsert molding. However, the main body of the carriage 4 and the arm 7 can be appropriately selected according to the specifications.

[Effect of device]

As is apparent from the above description, according to this invention in which the engaging means and the engaging holding means are integrally formed by the leaf spring, and the engaging projection forming side is fixed to the carriage, the cost is low and the settling time is reduced. It is possible to provide a short carriage transfer device.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 16 are for explaining an embodiment of the present invention. FIG. 1 is a side view of a magnetic head assembly, FIG. 2 is a rear view of the same, and FIG. The figure is a plan view of the carriage,
4 is a side view of the same, FIG. 5 is a plan view of the arm, FIG. 6 is a rear view of the same, FIG. 7 is a side view of the same, FIG. 8 is a plan view of a magnetic head unit, and FIG. 9 is a shield plate. FIG. 10 is an explanatory view showing a mounting state of 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 pressing spring portion of the follower.
FIG. 13 is a bottom view of the follower, and FIG.
FIG. 15 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, FIG. 16 is a cross-sectional view of the same part, and FIGS. FIG. 17 is a plan view of a carriage transfer device according to a conventional example, FIG. 18 is a front view of the same, FIG. 19 is a plan view of relevant parts, and FIG. It is a front view. 1 ... Magnetic head assembly, 2 ... Lower magnetic head unit, 3 ... Guide shaft, 4 ... Carriage,
5 ... Upper magnetic head unit, 7 ... Arm, 12 ...
... follower mounting plate, 12a ... follower mounting part, 16 ...
… Protrusion, 29 …… Follower, 29a …… Protrusion, 29b…
... Presser spring part, 29c ... Base part.

Claims (1)

[Scope of utility model registration request] 1. A carriage equipped with a head device, a guide shaft for guiding the carriage in a radial direction of an information recording disk, and a spiral feed groove formed on an outer peripheral surface of the carriage, which is rotationally driven by a rotary drive means. A screw shaft and an engaging device for engaging the screw groove of the screw shaft to convert the rotational movement of the screw shaft to the linear motion of the carriage along the guide shaft, and the engagement between the screw rod and the groove. In a carriage transfer device provided with engagement holding means for holding a relationship, the engagement means is bent by the engagement projection integrally provided on the leaf spring, and the engagement holding means is bent over the leaf spring. And a leaf spring portion on the back side of the engaging projection is fixed to the carriage. Yaritsuji transfer device.