JPH10312654A - Head transfer mechanism for disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a fear of breaking a wire of an excitation coil due to its contact with an I-yoke as a result of lifting up the I-yoke to the side of a U-shaped yoke by a magnet at the time of fitting this U-shaped yoke fitted with the magnet. SOLUTION: In a carriage transfer mechanism of this disk drive device, at least one end side of a bottom yoke 42 is provided with projecting parts 42c and 42d projecting outwardly in the longitudinal direction or/ and in the lateral direction of a bottom yoke 42 from its part overlapped with a top yoke 43. Consequently, at the time of assemblage, the top yoke 43 can be assembled under the state of pressing these projecting parts 42c and 42d, and hence the bottom yoke 42 is not moved upward, thus providing no fear of breaking a wire due to contact with the excitation coil 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a head transfer mechanism provided in a disk drive, and more particularly, to a head transfer mechanism provided in a disk drive.
The present invention relates to a head transfer mechanism that reciprocates a carriage in a radial direction of a disk by using a linear motor as a drive source.

[0002]

2. Description of the Related Art For example, a magnetic recording / reproducing apparatus which records / reproduces information on / from a magnetic disk accommodated in a disk cartridge has a head transfer mechanism for reciprocating a carriage in a radial direction of the magnetic disk. In recording and reproduction, when a carriage is operated by using a motor as a drive source, a magnetic head mounted on the carriage is reciprocated in a radial direction of a rotating magnetic disk.

Conventionally, as described in Japanese Utility Model Laid-Open No. 1-61877, such a head transfer mechanism using a linear motor as a drive source has been proposed. In such a head transfer mechanism, a linear motor is composed of a yoke combining an I-shaped yoke and a U-shaped yoke, a magnet fixed to the inner surface of the U-shaped yoke, and an exciting coil arranged around the I-shaped yoke. The components on the yoke side constituting the magnetic circuit of this linear motor are fixed on a support plate. A guide shaft is mounted on the support plate, and a carriage having a head mounted on the guide shaft is guided, and an excitation coil of the linear motor is fixed to a side surface of the carriage.

In the head transfer mechanism configured as described above, a propulsive force is generated in accordance with the direction of the current flowing through the exciting coil of the linear motor. Therefore, by controlling the current flowing through the exciting coil, the carriage is moved to the guide shaft. The disk is reciprocated in the radial direction of the disk along with the head mounted on the carriage to record / reproduce information on / from the disk.

[0005]

In a head transfer mechanism using a linear motor as a drive source, as described above, usually, after a carriage is incorporated in a guide shaft, an I-type yoke is inserted into an exciting coil fixed to the carriage. And
Thereafter, an assembling step of screwing the magnetic circuit components including the I-type yoke onto the support plate is adopted. However, since the head transfer mechanism is disposed in the main chassis together with other mechanical components, and as is well known, the main chassis has little extra space, so that the work for adjusting the I-type yoke to a predetermined screwing position is performed. Is very difficult, and when attaching a U-shaped yoke to which a magnet is attached, the I-type yoke is pulled up by the magnet toward the U-shaped yoke, and the I-type yoke may come into contact with the exciting coil and be disconnected. was there. In addition, when the I-type yoke is inserted into the exciting coil, care must be taken to prevent the exciting coil from coming into contact with the I-type yoke and disconnection. Had to be forced.

[0006]

According to the present invention, the bottom yoke constituting the head transfer mechanism is provided with a protruding portion which protrudes outward from a portion overlapping the top yoke.
With such a configuration, the bottom yoke can be pressed by the protruding portion, so that the upward movement of the bottom yoke can be prevented, the disconnection of the exciting coil during assembly can be prevented, and the assembling workability can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a head transfer mechanism of a disk drive according to the present invention, a guide shaft mounted on a support plate, a carriage reciprocated in the radial direction of the disk along the guide shaft, and A fixed excitation coil, a bottom yoke inserted into the excitation coil, a top yoke placed on the bottom yoke, a magnet fixed to the top yoke,
A set screw for fixing the bottom yoke and the top yoke to the support plate, and near the set screw for fixing the bottom yoke and the top yoke in an overlapping manner, at least one end of the bottom yoke, A configuration is provided in which a protruding portion is provided that protrudes outward in a longitudinal direction and / or a lateral direction of the bottom yoke from an overlapping portion with the top yoke.

Further, the protrusions are provided at both ends of the bottom yoke, so that the disconnection of the exciting coil can be more reliably prevented and the assembling property can be improved.

In addition, since the support plate is provided with a locking portion for hooking the upper surface of the protruding portion, the assembly can be performed without using a jig, and the cost is reduced and the assembling property is improved. Further, a locking portion for latching the upper surface of the projecting portion is provided at a rear end portion and a side portion of the support plate, and the projecting portions provided at both ends of the bottom yoke are provided at the rear end of the support plate. The configuration in which each of the locking portions provided on the portion and the side portion is engaged with each other makes it easier to assemble and lower the cost.

[0010]

Embodiments will be described with reference to the drawings.
1 is a plan view of a magnetic recording / reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a bottom view thereof, FIG. 4 is a plan view of a main chassis, and FIG. FIG. 6 is a right side view, FIG. 6 is a plan view showing a state in which an eject lever, a first lock lever, and the like are incorporated in the main shank, FIG. 7 is a cross-sectional view showing a mounting state of a mounting plate, and FIG. 9 is a plan view of the eject lever, FIG. 10 is a side view of the eject lever, FIG. 11 is a plan view of the sub-chassis, and FIG. 12 is a plan view showing a state in which a head transfer mechanism and the like are mounted on the sub-chassis. 13 and 14 are side views, FIG. 14 is a plan view of a support plate, FIG. 15 is a rear view thereof, FIG. 16 is a cross-sectional view taken along line AA of FIG. 14, and FIG. 17 is line BB of FIG. FIG. 18 is a plan view of the head transfer mechanism, and FIG. Is a side view thereof, FIG. 20 is a plan view showing an assembly process of a head transfer mechanism, FIG. 21 is an explanatory view showing an engagement state between a bottom yoke and a cylindrical projection, and FIG. 22 is an operation explanatory view of a head transfer mechanism. 23 is a plan view of the holder, FIG.
25 is an exploded perspective view of a stopper means, FIG. 26 is a perspective view of a disk cartridge, FIG. 27 is a front view thereof, FIG. 28 is a bottom view thereof, FIG. 29 is an operation explanatory view of an auxiliary lever, FIG. FIG. 31 is an explanatory view of the operation of the stopper means viewed from the side, FIG. 31 is an explanatory view of the operation of the stopper means viewed from the rear, FIG. 32 is a sectional view of a main part before assembling showing an assembling process of the bottom yoke and the top yoke. 33 is a sectional view of a main part after assembling showing an assembling process of a bottom yoke and a top yoke, FIG. 34 is a plan view of a main part according to a second embodiment of the disk drive device of the present invention, and FIG. FIG. 36 is a plan view of the disk drive device according to the third embodiment of the present invention with the top yoke removed, and FIG.
It is a side view for demonstrating the assembly process of a bottom yoke in FIG.

As shown in FIGS. 1 to 3, the magnetic recording / reproducing apparatus according to the present embodiment is supported on a main chassis 1 formed by bending a flat metal plate, and is capable of moving forward and backward and ascending and descending. The sub-chassis 2 includes a holder 3 fixed to an upper opening end of the main chassis 1, an eject lever 4 attached to a right side surface of the main chassis 1, and the like. The cartridge moves to the load position when the cartridge is inserted into the holder 3, and moves to the unload position when the eject lever 4 is pressed.

As shown in FIGS. 4 to 6, the main chassis 1 has a pair of upright walls 1b formed at right and left sides of a bottom surface 1a, and two upright walls 1b are provided on each side. Four cam holes 5 and four through holes 6 are respectively formed on the left and right sides. Metal mounting plates 7 are screwed to the four corners of the main chassis 1, and these mounting plates 7 are mounted on a device main body (not shown) via a buffer rubber or the like, so that a magnetic recording / reproducing apparatus including the main chassis 1 is provided. Are resiliently supported inside the apparatus main body. A stopper piece 7a is formed on each mounting plate 7, and the stopper piece 7a is inserted through the through hole 6 to form the upright wall 1a.
b. As is apparent from FIG. 7, the stopper piece 7a is bent at an acute angle with respect to the upright wall 1b, and when the mounting plate 7 is screwed to the upright wall 1b, the stopper plate 7a is used to attach the mounting plate. 7 can be temporarily held on the upright wall 1b. In the embodiment, the stopper pieces 7a are formed on all the mounting plates 7 in order to make the parts common, but the two mounting plates 7 on the front side (lower side in FIG. 6) of the main chassis 1 7a may be omitted, and stopper pieces 7a formed on the two mounting plates 7 on the rear end side function as stopper members that define the forward position of the sub-chassis 2.

An opening 8 is formed in the right standing wall 1b of the two standing walls 1b of the main chassis 1, and an auxiliary lever 10 is rotatable on a support shaft 9 projecting below the opening 8. It is supported. As shown in FIG. 8, the auxiliary lever 10 has a contact portion 10a and a hooking piece 10b formed by bending, and a plurality of projections 10c are formed on the plate surface of the auxiliary lever 10. The eject lever 4 is attached to the right upright wall lb so as to be able to move forward and backward. As shown in FIGS. 9 and 10, the eject lever 4 has a cover 4a bulging outward and an inwardly extending cover 4a. A sliding piece 4b that is bent is formed. As shown in FIG. 2, a spring 11 is stretched between the eject lever 4 and the upright wall 1 b, and the eject lever 4 is constantly urged toward the front side of the main chassis 1 by the elastic force of the spring 11. ing. A spring 12 is stretched between the eject lever 4 and the engaging piece 10b of the auxiliary lever 10, and most of the auxiliary lever 10 is mounted on the eject lever 4.
Cover 4a.

Referring back to FIGS. 4 and 6, the main chassis 1
A stopper projection 13 and a guide projection 14 are formed on the bottom surface 1a of the slide lever 4 and the sliding piece 4b of the eject lever 4 is guided by the guide projection 14 so as to be able to move forward and backward. A first lock lever 15 is rotatably supported by a shaft 16 on the bottom surface 1a of the main chassis 1, and a lock portion 15a and a receiving portion 15b are formed on the first lock lever 15. The first lock lever 15 is urged clockwise in FIG. 6 by a spring 17, and the receiving portion 15 b faces a release portion 4 c formed at the tip of the sliding piece 4 b of the eject lever 4.

[0015] As shown in FIG.
A second lock lever 18 and a drive arm 19 are rotatably supported on shafts 20 and 21, respectively, and an engagement hole 19 a is formed in the drive arm 19. The second lock lever 18 is urged in the counterclockwise direction in the figure by a spring 22 to form a lock portion 18a that can be disengaged from the stopper projection 13 and a receiving portion 18b that can contact the disk cartridge. ing,
Four guide projections 23 are formed on each side of the sub-chassis 2, two on each side, and four guide projections 23 on the left and right sides. These guide projections 23 are inserted into the cam holes 5 of the main chassis 1. I have. Furthermore, sub-chassis 2
Steps 2a are formed at the front end portions on both side surfaces of the mounting plate 7. The mounting plates 7 serve as stopper members.
The advancing position of the sub-chassis 2 is defined by contacting the stopper piece 7a. A projection 2b is formed on the right side surface of the sub-chassis 2 by bending, and the projection 2b is inserted through the opening 8 of the main chassis 1 and faces the contact portion 10a of the auxiliary lever 10 (FIG. 8).

As shown in FIGS. 11, 12, and 13, on the sub-chassis 2, a circuit board 25 on which a spindle motor 24 and its driving circuit components are mounted, and a support on which a head transfer mechanism 26 described later is mounted The drive arm 19 is fixed to the sub-chassis 2 and the support plate 27.
And is located between. A pair of receiving portions 2c, which can be in contact with the front end of the disk cartridge, are formed on both sides of the sub-chassis 2 inwardly, and the first lock lever is provided on the inner bottom surface of the sub-chassis 2. A stopper portion 2d that can be engaged with and disengaged from the 15 lock portions 15a is formed. A pair of springs 28 are stretched between the sub-chassis 2 and the bottom surface 1a of the main chassis 1 (see FIG. 3).
8, it is constantly urged to the front side of the main chassis 1, that is, to the unload position.

The head transfer mechanism 26 includes a linear motor 29, a carriage 30 driven by the linear motor 29, the linear motor 29 and the carriage 3
And the support plate 27 for supporting the C.O. FIG.
As shown in FIGS. 4 to 17, the peripheral edge of the support plate 27 is bent upward, and a pair of guide grooves 31 is formed in the bent rear end portion 27c. A long hole 27a and a trapezoidally projecting 4 are formed on the inner bottom surface of the support plate 27.
And two support portions 27b are formed.
Are coplanar. Cylindrical projections 32 projecting upward are formed on the two support portions 27b located far from the guide grooves 31, and these cylindrical projections 32 are formed.
A threaded portion 32a is engraved on the inner peripheral surface. On the other hand, cylindrical projections 33 protruding downward are formed on two support portions 27b located in the vicinity of the guide groove 31, and these cylindrical portions are formed. A screw portion 33 a is also engraved on the inner peripheral surface of the projection 33. It is desirable that the cylindrical projection 32 and the cylindrical projection 33 be formed integrally with the support plate 27 using burring.
The latter cylindrical projection 33 can be omitted. In that case, a screw hole may be formed directly on the plate surface of the support portion 27b.

As shown in FIGS. 18 and 19, a guide shaft 3 is provided at the center and right side of the support plate 27, respectively.
4 and 35 are fixed.
The carriage 30 is guided in the radial direction of the magnetic disk described later by 4, 35. The carriage 30 includes a base 36 having a pair of arms 36a, and an arm 37 hinged to the upper surface of the base 36 via a spring. The arm 37 is moved toward the base 36 by a load spring 38. Being energized. The base 36 has one guide shaft 34.
And the arm 36a is engaged with the other guide shaft 35. A first flat portion 37a, an inclined portion 37b, and a second flat portion 37c are formed continuously from the rear end to the front end of the lower surface of the arm 37, and the upper magnetic head 39 is attached to the front end. I have. On the other hand, a lower magnetic head 40 is attached to the carriage 30, and the lower magnetic head 40 is
9. A projection (not shown) is formed on the lower surface of the base 36 so as to be in contact with the tip of the drive arm 19, and the engagement hole 19a of the drive arm 19 is exposed in the elongated hole 27a of the support plate. doing.

The linear motor 29 has an exciting coil 41
And an I-shaped bottom yoke 42, a U-shaped top yoke 43, and a magnet 44 which form a magnetic circuit. These components are arranged in pairs on the left and right via the base 36. Has been established. The exciting coil 41 is fixed to both arms 36 a of the base 36 of the carriage 30, and an I-shaped bottom yoke 42 is inserted into the exciting coil 41. The magnet 44 is fixed to the lower surface of the top yoke 43, and the magnet 44 and the top yoke 43 are mounted on the bottom yoke 42 via the exciting coil 41. Top yoke 43 and bottom yoke 42
Are fixed to the support plate 27 using set screws 45, and these set screws 45 are screwed into the screw portions 32a, 33a. When the top yoke 43 and the bottom yoke 42 are overlapped and fixed with the set screw 45, as shown in FIGS. 12, 18, and 20, the bottom yoke 42 is positioned near the set screw 45. Projections 42c provided on both ends protrude outward in the longitudinal direction Y (see FIG. 18) of bottom yoke 42 from a portion overlapping top yoke 43.

The head transfer mechanism 26 constructed as described above
When assembling, the exciting coil 41
Is fixed to the carriage 30 and the guide shafts 34, 3
After the support plate 27 is screwed onto the sub-chassis 2, the bottom yoke 42 and the top yoke 43 are screwed to the support plate 27 in an overlapping state. here,
As shown in FIG. 20, a notch 42a and a hole 42b are formed at both ends of the bottom yoke 42, and the bottom yoke 42 is inserted from the side of the notch 42a in the direction of the arrow in FIG. At this time, the bottom yoke 42 is inserted in a state in which the lateral shake is restricted by the guide groove 31 of the support plate 27, and after the inside of the exciting coil 41 is inserted, the notch 42a is inserted into the cylindrical projection 32 as shown in FIG. At this time, the front end of the bottom yoke 42 in the insertion direction is positioned by the notch 42a and the cylindrical projection 32, and the rear end of the bottom yoke 42 is positioned by the guide groove 31 at this time. You. Therefore, in this state, when the top yoke 43 is superimposed on the bottom yoke 42, each set screw 45 is screwed from above the top yoke 43 into the screw portion 32.
a, 33a can be easily screwed. Furthermore, after the bottom yoke 42 is positioned by the cylindrical projection 32,
As shown in FIGS. 32 and 33, the jig 70 presses the protrusion 42 c of the bottom yoke 42 to regulate the upward and leftward and rightward (in FIGS. 32 and 33) movement to position the bottom yoke 42. I do. Thereafter, the top yoke 43 is overlaid on the bottom yoke 42 from the state shown in FIG. 32 to the state shown in FIG. At this time, since the protrusion 42c of the bottom yoke 42 is held down by the jig 70, the bottom yoke 42 does not move upward even if the magnetic action of the magnet 44 works during the assembly. The excitation coil 41 does not contact the excitation coil 41, and there is no possibility that the excitation coil 41 will be disconnected.
That is, the presence of the protrusion 42 c of the bottom yoke 42 can serve as a pressing member for the bottom yoke 42.

Returning to FIG. 1, the holder 3 and the bridging plate 45 are fixed to the upper opening end of the main chassis 1, and the driving pin 46 and the control pin 47 are fixed to the bridging plate 45. . The control pin 47 extends right below and is inserted into the engagement hole 19a of the drive arm 19, and rotates the drive arm 19 in conjunction with the movement of the sub-chassis 2. The drive pin 46 extends horizontally across the lower part of the arm 37 of the carriage 30. When the sub-chassis 2 is in the upper load position, the drive pin 46 is moved to the arm 37 as shown in FIG. When the upper magnetic head 39 is in contact with the second flat portion 37c of the arm 37, the upper magnetic head 39 is separated from the lower magnetic head 40, and as shown in FIG. The upper magnetic head 39 is urged toward the lower magnetic head 40 by the load spring 38 when the upper magnetic head 39 is located on the flat portion 37a side. In the state where the sub-chassis 2 is at the lower unload position, FIG.
As shown in (c), the drive pin 46 is connected to the first
, And both the upper magnetic head 39 and the lower magnetic head 40 are maximally separated from each other.

As shown in FIGS. 23 and 24, guide members 48 made of synthetic resin are mounted on both side surfaces of the holder 3, and guide the insertion of a disk cartridge described later on the inner surfaces of these guide members 48. A groove 48a is formed, and constitutes a disc cartridge insertion path. A guide hole 49 is formed in the upper surface of the holder 3, and a shutter opening / closing member 50 is slidably engaged with the guide hole 49. The shutter opening / closing member 50 is urged in one direction by a spring 51 and is located at the start end of the guide hole 49, and is provided with an opening / closing pin 52 extending below the holder 3. A first rotating body 53 and a second rotating body 54 that constitute stopper means are supported on the upper surface of the holder 3, and the second rotating body 54 is located below the holder 3 (the main chassis 1) by a spring 55. (In the bottom surface 1a direction).

As shown in FIG. 25, the first rotating body 53 has a shaft portion 53a substantially perpendicular to the insertion direction of the disk cartridge, and has a detecting portion 53b and a cam portion 5 at both ends thereof.
3c are integrally formed. The shaft portion 53a is rotatably supported by a plurality of cut-and-raised pieces 3a formed on the upper surface of the holder 3, and includes a detection portion 53b and a cam portion 53.
c extends downward through the through holes 56 and 57 formed on the upper surface of the holder 3. On the other hand, the second rotating body 54
Plate portion 54a substantially orthogonal to the shaft portion 53a of the rotating body 53 of FIG.
A bent portion 54b and a receiving portion 54c are integrally formed at both ends thereof, and the plate portion 54a is
d is vertically inserted through the through-hole 57. Bent part 54b
Is a notch formed at the rear end of the upper surface of the holder 3 (not shown).
The receiving portion 54c is overlapped on the cam portion 53c of the first rotating body 53 in the through hole 57. A restricting body 58 is provided at the tip of the receiving portion 54c.
Are rotatably supported. The restricting body 58 is made of a wire, and a triangular rotating portion 58a is bent at one end.

As shown in FIGS. 26 to 28, the above-described disk cartridge 59 has a cartridge case 60 in which a pair of upper and lower cases formed of a hard synthetic resin are joined and integrated, and the disk case 59 is rotated inside the cartridge case 60. It comprises a magnetic disk 61 housed freely and a shutter 62 reciprocally movable in the cartridge case 60. The shutter 62 is urged by a spring (not shown) in a direction to close an opening described later. . The shutter 62 is bent in an L-shape from the front surface to the lower surface of the cartridge case 60, and a cutout portion 62a is formed on the front surface. The lower surface of the cartridge case 60 has a flat shape, but the upper surface thereof is formed in an uneven shape. That is, the protrusions 60a are formed on both sides of the upper surface of the cartridge case 60, and the recess 60b is formed between the both protrusions 60a. In the recess 60b, a bulging portion 60c is formed in front of the cartridge case 60, and an opening 6 extends from the lower surface of the cartridge case 60 located immediately below the bulging portion 60c to the front end surface.
3 are formed.

Next, the operation of the magnetic recording / reproducing apparatus thus configured will be described. Here, for ease of understanding, the description will be made with the restrictor 58 removed first. When the disk cartridge 59 is not mounted, the sub chassis 2 is moved by the pair of springs 28 to the main chassis 1.
As shown in FIG. 2, the guide projection 23 is located at the lower end of the cam hole 5, and the sub-chassis 2 is located at the unloading position lowered to the bottom surface 1a side of the main chassis 1, as shown in FIG. doing. Also, the second lock lever 18
The locking portion 18a of the main chassis 1 is the stopper projection 1
By contact with the sub-chassis 3, the movement of the sub-chassis 2 is locked. At this time, as shown in FIG. 29A, the projection 2b of the sub-chassis 2 is
a, and the spring 12 is attached to the sub-chassis 2.
No spring force is acting. The base 36 of the carriage 30 contacts the drive arm 19 and is urged rearward of the support plate 27 so that the carriage 30 does not move due to external vibration. Further, as shown in FIG. 22C, the drive pin 46 is connected to the first flat portion 3 of the arm 37.
7a, the upper magnetic head 39 and the lower magnetic head 4
0 are in the state of being separated to the maximum, at this time,
The detecting unit 53b and the contacting unit 54d are
9, which is located closer to the main chassis 1 than the upper magnetic head 39.

When the disk cartridge 59 is inserted from an insertion opening (not shown) on the front of the apparatus and the disk cartridge 59 is inserted into the holder 3 along the groove 48a of the guide member 48 in the direction of arrow A in FIG. The shutter 62 of FIG. 59 is in a state where the opening 63 is opened, and as shown in FIGS. 30A and 31A, the detecting portion 53b of the first rotating body 53 is connected to the concave portion 60b of the cartridge case 60. The contact portion 54d of the second rotating body 54
Is opposed to the front surface of the cartridge case 60.

When the disc cartridge 59 is further inserted into the holder 3, the notch 62a of the shutter 62 of the disc cartridge 59 engages with the opening / closing pin 52, so that the shutter opening / closing member 50 moves in the guide hole 49 toward the end. At the same time, the shutter 62 moves in the direction of the concave portion 60b of the cartridge case 60, and the opening 63 starts to open. As a result, as shown in FIG. 30 (b) and FIG. 31 (b), the first rotating body 53 rotates when the detecting portion 53b contacts the upper end of the moved shutter 62, and the rotation is performed by the cam portion 5.
The second rotating body 54 rotates upward against the spring 55 with the bent portion 54d as a fulcrum because the cam portion 53c is transmitted to the receiving portion 54c via the 3c and the cam portion 53c pushes the support portion 54c upward of the holder 3. The contact portion 54d is retracted from the insertion path of the disk cartridge 59 and moves toward the concave portion 60b. Then, as shown in FIGS. 30C and 31C, the detecting section 53b and the contact section 54b are
Is completely located in the recess 60b after the opening 63 is completely opened, the disc cartridge 59 can be inserted all the way into the holder 3 without being hindered by the contact portion 54b.
During the insertion, the front surface of the disk cartridge 59 presses the receiving portion 18b, so that the second lock lever 1
8 rotates clockwise about the shaft 20 and the lock of the sub-chassis 2 is released. And the upper magnetic head 3
9 and the arm 37 are moved from the opening 63 to the cartridge case 60.
Can get inside.

When the disk cartridge 59 is inserted all the way into the holder 3, the front surface of the cartridge case 60 abuts against the receiving portion 2c of the sub-chassis 2, and the receiving portion 2c is pressed by the insertion force of the disk cartridge 59.
The guide protrusion 23 moves to the upper end side along the cam hole 5 of the main chassis 1, and the sub-chassis 2
While moving forward on the main chassis 1 against the pulling force of the main chassis 1 and rising toward the upper surface of the holder 3 to reach the load position. In this loading position, the projection 2b of the sub-chassis 2 moves in the opening 8 and presses the contact portion 10a of the auxiliary lever 10, so that the auxiliary lever 10 moves the support shaft 9 as shown in FIG. By slightly rotating clockwise as the center, the length of the spring 12 is extended from the natural length L1 to L2. In this load position, the first lock lever 1
The sub-chassis 2 is locked at the loading position by the rotation of the sub-chassis 5 in the clockwise direction about the shaft 16 and the engagement of the locking portion 15 a with the stopper 2 d of the sub-chassis 2. When the sub-chassis 2 moves forward with respect to the main chassis 1, the control pin 47 provided on the bridge plate 45 rotates the drive arm 19, and the regulation of the base 36 by the drive arm 19 is released. Numeral 30 is in a state where it can freely move along the guide shafts 34, 35. When a large force is applied from the outside due to a drop or the like at the load position, the sub-chassis 2 further moves forward against the holding force of the first lock lever 15. The sub-chassis 2 is mounted on the sub-chassis 2 because the sub-chassis 2 is mounted on the sub-chassis 2 because the portion 2a comes into contact with the stopper pieces 7a of the two mounting plates 7 fixed to the rear end side of the main chassis 1. Damage to the mounted components is prevented.

In this manner, the disk cartridge 59
When the disc cartridge 59 is completely inserted into the holder 3, the disc cartridge 59 is held at the raised position by the holder 3,
The spindle motor 24 moves up with the sub-chassis 2,
It engages with a center hub (not shown) of the magnetic disk 61 housed in the disk cartridge 59. Then, the magnetic disk 61 is driven by the driving of the spindle motor 24.
Rotates, and the head transfer mechanism 26 is also driven in accordance with the direction and magnitude of the current supplied to the excitation coil 41 of the linear motor 29, and the carriage 30
The disk is reciprocated in the radial direction of the magnetic disk 61 along the lines 4 and 35. At this time, when the relative position between the lower surface of the arm 37 and the drive pin 46 provided on the bridge plate 45 changes with the reciprocating movement of the carriage 30, and the carriage 30 is at the retract position away from the magnetic disk 61, As shown in FIG. 22A, the drive pin 46 contacts the second flat portion 37c of the arm 37, and the upper magnetic head 39 separates from the magnetic disk 61. On the other hand, when the carriage 30 is moved toward the center of the magnetic disk 61, as shown in FIG. 22B, the drive pin 46 does not contact the arm 37, and the upper magnetic force is generated by the elastic biasing force of the load spring 38. The head 39 is pressed against the lower magnetic head 40 via the magnetic disk 61, and these magnetic heads 39, 4
Recording / reproduction of information with respect to the magnetic disk 61 is performed by 0.

On the other hand, when ejecting the disk cartridge 59 from the apparatus, the eject lever 4 is
When the push-in and forward operation is performed against 1, the release portion 4 c of the eject lever 4 presses the receiving portion 15 b, and the first lock lever 15 rotates counterclockwise. When the first lock lever 15 rotates counterclockwise, the lock portion 1 is rotated.
The engagement between the stopper 5d and the stopper 2d is released, and the sub-chassis 2 descends while moving backward on the main chassis 1, contrary to the above, so that the disk cartridge 59 receives the return force of the receiving portion 2c of the sub-chassis 2 and the spring 51. And the sub-chassis 2 is again locked at the unload position by the second lock lever 18.

When the disc cartridge 59 is ejected, the length of the spring 12 is extended to the maximum length L3 with the advance operation of the eject lever 4, as shown in FIG. Since a sufficiently large rotational force in the clockwise direction is stored, when the lock operation by the first lock lever 15 is released, the sub-chassis 2 is unloaded by the urging force of both the spring 28 and the auxiliary lever 10. Move to position.

When the disk cartridge 59 is ejected, the head transfer mechanism 26 descends together with the sub-chassis 2. However, since the downward movement of the arm 37 is restricted by the drive pin 46, FIG. As shown in (1), the drive pin 46 contacts the first flat wall portion 37a of the arm 37, and both the upper magnetic head 39 and the lower magnetic head 40 are largely separated from the magnetic disk 61. Therefore, when the disk cartridge 59 is ejected, both magnetic heads 3
The magnetic heads 9, 40 can be prevented from hitting the disk cartridge 59, and the magnetic heads 39, 40 can be prevented from being damaged.

In the insertion operation of the disk cartridge 59 described above, for example, when the disk cartridge 59 is vigorously inserted into the holder 2, when the opening / closing pin 52 comes into contact with the shutter 62, it bounces and comes off from the notch 62a. 62 may not open. In this case, when the disc cartridge 59 is further inserted into the holder 2, the detection section 53 b of the first rotating body 53 does not come into contact with the shutter 62, and
, The second rotating body 54 does not rotate, and the contact portion 54d remains on the insertion path of the disk cartridge 59. Therefore, at a position just before the disk cartridge 59 hits the magnetic heads 39 and 40, the front surface of the cartridge case 60 abuts on the abutting portion 54d, and the further disk cartridge 59
Is prevented from being inserted.

Next, the operation of the regulating member 58 will be described. During the insertion of the disc cartridge 59, the detecting portion 53b of the first rotating member 53 comes into contact with the shutter 62, and both the detecting portion 53b and the contacting portion 54d. Is located in the recess 60b of the cartridge case 60, and then the disc cartridge 59 is returned in the ejecting direction and then inserted again, the regulating body 58 recognizes the role of permitting this operation. That is, the disc cartridge 59
First, after the rotating portion 58a of the regulating member 58 rides on the concave portion 60b of the cartridge case 60, the detecting portion 53b of the first rotating member 53 is rotated by the shutter 62, and subsequently, the second Contact part 5 of rotating body 54
The timing is such that 4d moves onto the concave portion 60b, and the rotating portion 58a is in a position where it cannot rotate on the concave portion 60b. Therefore, when the disk cartridge 59 is returned in the ejection direction from the state shown in FIG. 30C, the detecting portion 53b abuts on the upper end of the shutter 62, and the abutting portion 54d starts to separate from the disk cartridge 59. , Until the rotating portion 58a is on the concave portion 60b.
The rotating body 54 is maintained at the raised position by the rotating portion 58a, so that the front surface of the cartridge case 60 does not come into contact with the contact portion 54d even when the disk cartridge 59 is inserted again. On the other hand, when the regulating member 58 is not provided, when the disc cartridge 59 is returned to the ejection direction during the insertion, the second rotating member 54 is moved to the disc cartridge 59 when the contact portion 54d is separated from the disc cartridge 59. Therefore, even if the user tries to insert the disk cartridge 59 again immediately after that, the insertion operation of the disk cartridge 59 is prevented by the contact portion 54d even though the shutter 62 is open. I will.

FIGS. 34 and 35 show a second embodiment of the disk drive apparatus according to the present invention. In this embodiment, the bottom yoke 42 is provided at both ends of the bottom yoke 42 from the overlapping portion with the top yoke 43. 42, a protrusion 42d protruding outward in the lateral direction Z of the jig 7 is provided.
Since the other components are the same as those in the above-described embodiment, the same members are denoted by the same reference numerals and description thereof will be omitted.

FIGS. 36 and 37 show a third embodiment of the disk drive device of the present invention. In this embodiment, the rear end portion 27c of the support plate 27 covers a part of the guide groove 31. And the protrusion 42 on one end side of the bottom yoke 42
c is provided on the side surface 27e of the support plate 27, and the protrusion 4 protrudes into the support portion 27 and is provided at the other end of the bottom yoke 42.
A configuration is provided in which a locking portion 27f for locking the upper surface of 2c is provided. Then, the bottom yoke 42 is assembled by inserting the bottom yoke 42 into the support plate 27 in a state where the bottom yoke 42 is aligned with the guide groove 31, as shown in FIG. 37B, the bottom yoke 42 is slid in the direction of the arrow, and the upper surface of the protruding portion 42c at one end is hooked on the locking portion 27d, as shown in FIG. The top yoke 43 is assembled in a state where the top yoke 43 is stopped and the upward movement of the bottom yoke 42 is prevented. With such a configuration, the bottom yoke 42 and the top yoke 43 can be assembled without using the jig 70, and the assemblability is improved.

The protrusions 42c,
42d has been described as being provided on both ends of the bottom yoke 42, but may be provided on one side.
Of course, f may be either one.

[0038]

As described above, according to the present invention, at least one end of the bottom yoke projects outward from the overlapping portion with the top yoke in the longitudinal direction and / or the short direction of the bottom yoke. Since the top yoke is provided, the top yoke can be assembled in a state where the protruding portion is held down during assembly, and therefore, there is no upward movement of the bottom yoke,
It is possible to provide one that is free from disconnection due to contact with the exciting coil.

Further, since the projections are provided at both ends of the bottom yoke and pressed at both ends, contact with the exciting coil can be reliably prevented, and disconnection of the exciting coil is more reliably prevented, and assembling performance is improved. Can be provided.

Further, by providing the support plate with a locking portion for latching the upper surface of the protruding portion, it is possible to assemble the device without using a jig while preventing the bottom yoke from moving upward. It is possible to provide an assembly having good assemblability, being inexpensive, and having no disconnection of the exciting coil.

Further, since the protrusions provided on both ends of the bottom yoke are latched by the locking portions provided on the rear end portion and the side surface portion of the support plate, the upward movement of the bottom yoke during assembly is ensured. It is possible to provide a coil which can be prevented, has better assemblability, is inexpensive, and reliably prevents disconnection of the exciting coil.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 2 is a right side view of the magnetic recording / reproducing apparatus.

FIG. 3 is a bottom view of the magnetic recording / reproducing apparatus.

FIG. 4 is a plan view of a main chassis.

FIG. 5 is a right side view of the main chassis.

FIG. 6 is a plan view showing a state where an eject lever, a first lock lever, and the like are incorporated in the main chassis.

FIG. 7 is a cross-sectional view showing a mounting state of the mounting plate.

FIG. 8 is a side view showing an attached state of an auxiliary lever.

FIG. 9 is a plan view of an eject lever.

FIG. 10 is a side view of the eject lever.

FIG. 11 is a plan view of a sub-chassis.

FIG. 12 is a plan view showing a state where a head transfer mechanism and the like are mounted on the sub-chassis.

FIG. 13 is a side view of the sub-chassis.

FIG. 14 is a plan view of a support plate.

FIG. 15 is a rear view of the support plate.

FIG. 16 is a sectional view taken along line AA in FIG. 14;

FIG. 17 is a sectional view taken along line B-B of FIG. 14;

FIG. 18 is a plan view of a head transfer mechanism.

FIG. 19 is a side view of the head transfer mechanism.

FIG. 20 is a plan view showing an assembly process of the head transfer mechanism.

FIG. 21 is an explanatory diagram showing an engagement state between a bottom yoke and a cylindrical projection.

FIG. 22 is an explanatory diagram of the operation of the head transfer mechanism.

FIG. 23 is a plan view of the holder.

FIG. 24 is a front view of the holder.

FIG. 25 is an exploded perspective view of the stopper means.

FIG. 26 is a perspective view of a disk cartridge.

FIG. 27 is a front view of the disk cartridge.

FIG. 28 is a bottom view of the disk cartridge.

FIG. 29 is a diagram illustrating the operation of the auxiliary lever.

FIG. 30 is an explanatory view of the operation of the stopper means viewed from the side.

FIG. 31 is an explanatory view of the operation of the stopper means as viewed from the back.

FIG. 32 is an essential part cross sectional view showing a process of assembling the bottom yoke and the top yoke before assembling;

FIG. 33 is an essential part cross sectional view showing an assembling step of the bottom yoke and the top yoke after the assembly;

FIG. 34 is a plan view of a main part according to a second embodiment of the disk drive device of the present invention.

FIG. 35 is a plan view of FIG. 34 with a top yoke removed.

FIG. 36 is a plan view of a main part according to a third embodiment of the disk drive device of the present invention.

FIG. 37 is a side view for explaining an assembling step of the bottom yoke in FIG. 36;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main chassis la Bottom surface 1b Standing wall 2 Subchassis 2a Step 2b Projection 3 Holder 4 Eject lever 4a Cover 5 Cam hole 6 Through hole 7 Mounting plate 7a Stopper piece 8 Opening 10 Auxiliary lever 10a Contact part 10b Joint piece 10c Projection DESCRIPTION OF SYMBOLS 12 Spring 15 1st lock lever 24 Spindle motor 26 Head transfer mechanism 27 Support plate 27b Support part 27c Rear end part 27d Lock part 27e Side part 27f Lock part 28 Spring 29 Linear motor 30 Carriage 31 Guide groove 32 Cylindrical projection 32a Screw part 34, 35 Guide shaft 36 Base 36a Arm part 39 Upper magnetic head 40 Lower magnetic head 41 Excitation coil 42 Bottom yoke 42a Notch 42b Hole 42c, 42d Projection 43 Top yoke 44 Magnet 45 Stop 50 50 Closure member 53 First rotating body 53b Detecting section 53c Cam section 54 Second rotating body 54d Contact section 55 Spring 56, 57 Through hole 58 Regulator 58a Rotating section 59 Disk cartridge 60 Cartridge case 60b Concave section 61 Magnetic field Disc 62 Shutter 70 Jig

Claims (4)

[Claims] 1. A guide shaft mounted on a support plate, a carriage reciprocally moved in a radial direction of a disk along the guide shaft, an exciting coil fixed to the carriage, and a coil inserted through the exciting coil. A bottom yoke, a top yoke placed on the bottom yoke, a magnet fixed to the top yoke, and a set screw for fixing the bottom yoke and the top yoke to the support plate; At least one end of the bottom yoke in the vicinity of the set screw that overlaps and fixes the top yoke is located outward from the overlapping portion with the top yoke in the longitudinal direction and / or short direction of the bottom yoke. A head transfer mechanism for a disk drive device, comprising a protrusion protruding from the head. 2. A head transfer mechanism for a disk drive according to claim 1, wherein said projecting portions are provided on both ends of said bottom yoke. 3. A head transfer mechanism for a disk drive according to claim 1, wherein said support plate is provided with a locking portion for latching an upper surface of said projecting portion. 4. The bottom yoke according to claim 2, wherein a locking portion is provided at a rear end portion and a side portion of the support plate to lock an upper surface of the projecting portion. A head transfer mechanism for a disk drive device, wherein the provided protrusions are respectively latched by the locking portions provided on a rear end portion and a side surface portion of the support plate.