JPH04168619A - Azimuth regulating mechanism for external memory - Google Patents

Abstract

PURPOSE:To prevent a positioning error of a magnetic head upon azimuth regulation by placing a carriage, moving means and guide means on a subframe, and rotating the subframe to a main frame to regulate an azimuth angle. CONSTITUTION:A carriage 4 is telescoped by rotatably driving a lead screw 7 of a driving shaft of a stepping motor (moving means) 6 under the guidance of a guide rod (guide means) 5 provided along the carriage 4. The carriage 4, the rod 5 and the motor 6 are mounted on a subframe 21 provided on a main frame 2 to constitute an azimuth regulating mechanism of a magnetic head 3 together with mounting fittings 22 on the frame 2. Thus, the azimuth regulation is performed without loss of the positioning accuracy of the head to a track position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floppy disk drive (hereinafter referred to as rFDD).
The invention relates to an azimuth adjustment mechanism for an external storage device such as an external storage device (referred to as J).

[Conventional technology]

In an FDD, a floppy disk inserted into a frame is driven to rotate, and a magnetic head is placed on the floppy disk to record, erase, or reproduce information.

In this case, as the recording density (BPI) of information written on the floppy disk becomes higher, the azimuth tolerance becomes smaller, so an azimuth adjustment mechanism is required.

FIG. 5 shows the conventional technology around the azimuth adjustment mechanism of such FDD (Japanese Patent Application Laid-Open No. 62-154318, Japanese Patent Application Laid-open No. 63-1
61513 and the basic structure disclosed in JP-A-1-251469).

As shown in the figure, this FDD 51 has its frame 5
A magnetic head 53 is provided for recording and reproducing information on the floppy disk F inserted into the floppy disk F, and this magnetic head 53 is held by a carriage 54 and faces the floppy disk F. . The gear ridge 54 is configured to move forward and backward in the radial direction of the floppy disk F so that the magnetic head 53 faces a desired track position on the floppy disk F, and this forward and backward movement is guided by a guide rod 55. This is performed by a stepping motor 56 fixed to the frame 52. That is, a sliding member 57 through which a guide rod 55 is inserted is fixed to one side of the base of the carriage 54, and a needle arm 59 for holding a needle 58 is fixed to the other side. has been done. A lead screw 60, which is a drive shaft of the stepping motor 56, is screwed into the needle 58, and the needle 58 is driven by its forward and reverse rotation.
The carriage 54 is moved forward and backward via the.

Both ends of the guide rod 55 are pressed and fixed to the frame 52 by mounting screws 63 via a first presser metal fitting 61 closer to the back and a second presser metal fitting 62 closer to the front. An eccentric pin 64 is provided at the first presser fitting 61 on the opposite side of the first presser fitting 61 with the guide rod 55 interposed therebetween. The eccentric pin 64 is screwed into the frame 52, and the cam surface on the side surface of the eccentric pin 64 comes into contact with the guide rod 55. The first presser metal fitting 61 presses the end of the guide rod 55 toward the frame 52 and urges the end of the guide rod 55 toward the eccentric bin 64 . Therefore, when the eccentric pin 64 is rotated, its cam surface acts on the guide rod 55, and the first presser metal fitting 61
In contrast, the guide rod 55 can be moved minutely in a direction perpendicular to its axis. That is, this minute movement makes it possible to adjust the angle of the carriage 54 with respect to the floppy disk F, thereby making it possible to adjust the azimuth angle of the magnetic head 53.

[Problem to be solved by the invention]

In this way, when the azimuth angle is adjusted by adjusting the angle of the guide rod 55, the parallelism between the guide rod 55 and the lead screw 60, which is fixed and positioned on the frame 52, is lost. That is, the parallelism between the forward and backward movement direction of the magnetic head 53 and the axial direction of the lead screw 60 is impaired. If this parallelism is impaired, the driving distance of the needle screwed into the lead screw and the driving distance of the magnetic head will not be the same, causing problems such as the track position of the magnetic head being shifted and the positioning of the magnetic head being incorrect. arise.

The present invention provides positioning of a magnetic head with respect to a track position,
It is an object of the present invention to provide an azimuth adjustment mechanism for an external storage device that enables azimuth adjustment without impairing accuracy.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides an external structure that includes a carriage to which a head for accessing the medium is attached, a moving means for moving the carriage forward and backward in the radial direction of the medium, and a guide means for guiding the forward and backward movement of the carriage. In the azimuth adjustment for adjusting the azimuth angle of the storage device, the subframe on which the carriage and the moving means Oyohigite means are mounted is rotatably engaged with the subframe at an arbitrary position on the central axis of the head gap of the magnetic head. The present invention is characterized by comprising a main frame, and an adjusting means fixed to the main frame and capable of rotating the engaged sub-frame to adjust the azimuth angle.

[Effect]

The adjusting means rotates the engaged subframe with respect to the main frame to adjust the angle of the magnetic head, thereby adjusting the azimuth angle of the magnetic head with respect to the media. In this case, since the subframe is engaged with the main frame at any position on the central axis of the head gap of the magnetic head, the azimuth angle can be adjusted by adjusting the angle by rotating the subframe.

Further, since the carriage, the moving means, and the guide means are mounted on the subframe, the mutual positional relationship of the carriage, the moving means, and the guide means does not change even when the azimuth angle is adjusted.

〔Example〕

With reference to FIGS. 1 and 2, an FDD (external storage device) in which an embodiment of the azimuth adjustment mechanism of the present invention is used
I will explain about it. Figure 1 is a partial plan view of the FDD with the cartridge holder removed, and Figure 2 is a partial plan view of the FDD with the cartridge holder removed.
FIG.

As shown in Fig. 1, a floppy disk F as a medium housed in a cartridge C is set in the main frame 2 of this FDDI. Head 3.3 is facing towards it. The magnetic head 3 is attached to the disk F side surface at the tip of the carriage 4.
As the carriage 4 moves forward and backward, it is adapted to appropriately approach a desired track position in the radial direction of the floppy disk F.

This movement of the carriage 4 back and forth is guided by a guide rod (guide means) 5 provided along the carriage 4, and is performed by rotation of a lead screw 7, which is a drive shaft of a stepping motor (moving means) 6. For this reason, a sliding member 8 through which the guide rod 5 is inserted, and a needle arm 10 holding a needle 9 screwed into the lead screw 7 are fixed to both sides of the carriage 4.

The lead screw 7 of the stepping motor 6 is provided so that its axial direction is parallel to the advancing and retracting direction of the magnetic head 3, that is, the axial direction of the guide rod 5, and the needle 9 of the carriage 4 is screwed into the helical groove of the lead screw 7. It is supposed to be done. . The needle 9 converts the rotational movement of the lead screw 7 into the forward and backward movement of the carriage 4. The magnetic head 3 approaches a desired track position on the floppy disk F by the controlled rotation of the stepping motor 6, and records and plays back on the floppy disk F. Access such as deletion and deletion is now possible.

These carriage 4, guide rod 5, and stepping motor 6 are attached to a subframe 21 provided on the main frame 2, and the magnetic head 3 is attached to the main frame 2 together with a metal fitting 22 (described later). It constitutes an azimuth adjustment mechanism.

As shown in FIG. 2, the subframe 21 is provided to be seated on the main frame 2, and is engaged with the main frame 2 with an engagement protrusion 21a located on the central axis A of the head gap of the magnetic head 3. ing. For this reason, the subframe 21 is rotatable with respect to the main frame 2, and the attachments arranged on the left and right sides of the subframe 21 ("left and right" in the drawing) are fixed to the main frame 2 using metal fittings 22 and 22. It is designed to be fixed. Each mounting bracket 22 is composed of a plate spring screwed to the main frame 2, and a block 2 provided on the subframe 21, respectively.
It has two claw pieces 22a, 22a that come into contact with 3.

The block 23 has a curved surface that comes into contact with the claw piece 22a, and the claw piece 22a, which has been bent somewhat, comes into contact with this curved surface. Therefore, the claw piece 22a is attached to the subframe 2.
It has both the function of pressing 1 against the main frame 2 and the function of urging it toward the other side. For this reason, the subframe 21 is attached to the left and right using metal fittings 22. 2')
It is biased from both sides, and it is held down and fixed at a position where the biasing forces are balanced.

On the other hand, for mounting on the stepping motor 6 side, a countersunk screw 24 is provided beside a metal fitting 22, and this flat head screw 24 and the mounting metal fitting 22 constitute means for adjusting the azimuth angle. That is, this countersunk screw 24 has a tapered surface 2 of the countersunk.
4a is screwed into the main frame 2 while being in contact with the end of the subframe 21. Therefore, when the countersunk screw 24 is rotated, a horizontal force due to its tapered surface 24a acts on the sub-frame 21, causing the sub-frame 21 to move slightly in the left-right direction against the mounting fittings 22. Due to this minute movement, the subframe 21 is rotated around the engagement protrusion 21a, so that the azimuth angle can be adjusted.

With this configuration, the azimuth can be adjusted by rotating the countersunk screw 24 in forward and reverse directions. In addition, since the carriage 4, guide rod 5, and stepping motor 6 are attached to the subframe 21, the parallelism between these components, especially the axis of the guide rod 5 and the axis of the lead screw 7, is ensured. Next, the FDD C external storage device according to the second embodiment will be explained with reference to FIGS. 3 and 4. do.

This embodiment differs from the first embodiment in that an eccentric pin 25 is used in place of the countersunk screw 24 described above. That is, the eccentric pin 25 is screwed into the main frame 2, and its head side surface 25a abuts against the end of the subframe. The head side surface 25a of the eccentric bin 25 has an eccentric circular shape, that is, a cam surface, and the cam action of the head side surface 25a due to the rotation of the eccentric bin 25 allows the subframe 21 to be mounted left and right against the metal fittings 22. make a slight movement in the direction. Through this minute movement, the azimuth angle can be adjusted as in the above-described embodiment.

In the above embodiments, the azimuth adjustment mechanism of an FDD has been described, but the present invention is not limited to this, and it goes without saying that the present invention can be applied to a hard disk drive device, a compact disk drive device, etc.

[Effects of the Invention] As described above, according to the present invention, the carriage, the moving means, and the guide means are mounted on the subframe, and the azimuth angle is adjusted by rotating the subframe with respect to the main frame. Therefore, the azimuth angle can be adjusted without affecting the positioning accuracy of the magnetic head, and it is possible to prevent misalignment of the magnetic head positioning due to azimuth adjustment.

[Brief explanation of drawings]

FIG. 1 is a plan view of an FDD according to a first embodiment of the present invention;
FIG. 2 is a partially cutaway side view thereof, FIG. 3 is a plan view of an FDD according to a second embodiment of the present invention, FIG. 4 is a partially cutaway side view thereof, and FIG. 5 is a plan view of the prior art. . DESCRIPTION OF SYMBOLS 1... FDD, 2... Main frame, 3... Magnetic head, 4... Carriage, 5... Guide wood, 6... Stepping motor, 21... Subframe, 21a...・Engagement protrusion, 24... Countersunk, 25・
... Eccentric bottle, F... Floppy disk, C...
Cartridge, A...center axis. Representative Patent Attorney Yoshiki Hase
Minoru Ochiai Figure 5 Cross-sectional structure of the embodiment Figure 2 Structure of the second embodiment Figure 3 Cross-sectional structure of the second embodiment Figure 4

Claims (1)

[Scope of Claims] An external storage device comprising: a carriage to which a head for accessing a medium is attached; a moving means for moving the carriage forward and backward in a radial direction of the medium; and a guide means for guiding the forward and backward movement of the carriage. An azimuth adjustment mechanism for adjusting an azimuth angle of the head, comprising: a subframe on which the carriage, the moving means, and the guide means are mounted; and the subframe is rotatable at any position on the central axis of the head gap of the head. An external storage device comprising: a main frame that is engaged with the main frame; and an adjusting means that is fixed to the main frame and rotates the engaged subframe to enable adjustment of the azimuth angle. Azimuth adjustment mechanism of the device.