JPH0437347Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic head access device for a floppy disk drive that improves azimuth accuracy and access position accuracy to ensure data compatibility with high accuracy.

2. Description of the Related Art Conventionally, there is a magnetic head access device for a floppy disk drive as shown in FIG. That is, the carriage 10 has a guide piece 10A projecting from one side of the guide shaft 4, which extends over a bearing 2 provided on the chassis 1 and is fixed by a fixture 3. The lead screw 8 is slidably fitted loosely through the lead screw 8.
A nut piece 1 protruding from the other side at the middle part of the
A magnetic head 9 is attached to the upper surface of the magnetic head 9, and a lead screw 8 is provided on the chassis 1 in parallel with the guide shaft 4 and at a constant interval. The lead screw holder 5 is screwed onto the lead screw holder 5, and one end is connected via a joint 7 to a stepping motor 6 mounted on the chassis 1, and the rotation of the stepping motor 6 causes the magnetic head to The magnetic head 9 is provided on the chassis 1 on the left side of the magnetic head 9, and moves the magnetic head 9 reciprocally in the direction of a turntable 12 on which a floppy disk 11 is mounted and rotated by a spindle motor.

The effect is as follows. When the floppy disk 11 is mounted on the turntable 12 and reaches a predetermined number of rotations, reading or writing starts in the read/write gap 9A of the magnetic head 9, and accordingly, the stepping motor 6
rotates. The designated rotation direction and rotation angle by the stepping motor 6 are applied to the lead screw 8 via the joint 7. The rotational movement of the lead screw 8 is converted into linear movement of the carriage 10 via the nut piece 10B. Therefore, the carriage 10 moves by a predetermined amount in a predetermined direction using the guide shaft 4 as a guide. Naturally, the read/write gap 9A also moves.

Such floppy disk drives are required to have data compatibility, which means that data written on different models must be able to be read without error. In order to satisfy this requirement, the read/write gap 9A must be parallel to the movement locus of the magnetic head 9, in other words, the virtual reference line (Y
(see FIG. 1(b)), and must move a predetermined amount at any position on the floppy disk 11. In other words, by matching and moving by a predetermined amount, the request is ensured with high precision. In order to check the coincidence of the former read/write gap 9A with the virtual reference line (Y axis) of the floppy disk 11, the so-called azimuth accuracy, after assembly,
The azimuth angle of the read/write gap 9A is checked using an inspection disk, but in the prior art, the magnetic head 9 directly connects the carriage 1.
Since the magnetic head 9 is glued and fixed to 0, if an attempt is made to correct the magnetic head 9 as a result of the check, it will take a great deal of effort. Therefore, in order to eliminate such correction, the magnetic head 9 is moved to the carriage 10.
After accurately attaching the carriage 10 to the guide shaft 4 and the lead screw 8, fit and screw the carriage 10 onto the guide shaft 4 and the lead screw 8.
Alternatively, it is conceivable to fit and screw the carriage 10 onto the guide shaft 4 and lead screw 8, and then accurately attach the magnetic head 9 to the carriage 10 using a cage or the like. However, in the case of the previous example, accurate positioning of the magnetic head 9 with respect to the carriage 10 can be achieved, but the machining accuracy of the bearing portion 2, the mounting condition of the guide shaft 4 with the fixture 3, the straightness of the guide shaft 4, and the center of the spindle motor Depending on the location, etc., the results may not necessarily be as expected. Further, in the case of the latter example, it is actually quite difficult to implement it due to restrictions on wiring processing of the magnetic head 9 and space restrictions such as cages.

In order to improve the accuracy of the latter movement of the read/write gap 9A by a predetermined amount, the so-called access position, the guide shaft 4 and the lead screw 8 are
It is necessary that the nut piece 10B be screwed onto the lead screw 8 with the centers of the guide shaft 4 and the center of the guide hole (not shown) of the guide piece 10A being aligned. If these conditions are not met, the static friction force between the lead screw 8 and the nut piece 10B increases rapidly during a certain movement process or the entire movement process of the carriage 10, and the load torque of the lead screw 8 rapidly increases. do. Therefore, the driving torque and stepping accuracy of the stepping motor 6 are reduced, the performance of the stepping motor 6 is not fully exhibited, and the amount of off-track increases. Along with this, access position accuracy naturally decreases.

In order to satisfy the above conditions, it is necessary to accurately fix the lead screw holder 5 on the shear sea 1. However, even if the lead screw holder 5 is accurately fixed, the eccentricity of the guide shaft 4 and lead screw 8 themselves etc., the load torque of the lead screw 8 changes periodically, and the amount of off-track increases.

As a means to avoid the above-mentioned problem, it is possible to allow some margin in the screwing relationship between the lead screw 8 and the nut piece 10B, but this is because when the floppy disk 11 becomes high density,
Correlatively, this causes problems of batching and is not the best method.

This invention was made for the purpose of solving the drawbacks of the prior art, and the magnetic head access device for a floppy disk drive of this invention has a structure in which the carriage is divided into two layers: an adjustment carriage and a fixed carriage. A fixed carriage with a guide portion and two screw holes formed on the line, and a line that matches the virtual reference line of the floppy disk on the upper surface, and a line that matches the virtual reference line of the floppy disk on the upper surface. A groove for mounting a magnetic head is formed in one end of the upper surface, a guide portion opposite to the guide portion is formed in the groove, and the magnetic head is fixed with adhesive. A through hole for tightening the screw with an adjustment allowance is drilled facing each of the screw holes, and a part of the middle part is cut out along the line and used as a reference side surface. In addition, the lead screw holder is fixed on the chassis via a flexible member that has a degree of freedom only in the direction perpendicular to the longitudinal direction of the lead screw.

This invention will be explained below based on the drawings.

FIG. 2 is a diagram showing an embodiment of this invention.

First, to explain the structure, the carriage is formed in two layers, an adjustment carriage and a fixed carriage, an upper and a lower layer.

20 is a fixed carriage, one end of which connects to the guide shaft 4 via a guide piece 10A protruding from one side.
The other end is screwed into the middle part of the lead screw 8 via a nut piece 10B protruding from the other side. A line 20L is engraved on the top surface of the fixed carriage 20, which coincides with the rotation center of the turntable 12 and the virtual reference line (Y axis) of the floppy disk 11. A guide portion, for example, a guide pin 21 is provided protrudingly,
Screw holes 22 and 23 are drilled and dug.

Note that a through hole 24 for processing the wire of the magnetic head 9 is bored near the guide pin 21. Through hole 2
4 may be replaced by a groove extending to one end or the other end of the fixed carriage 20.

Reference numeral 30 denotes an adjustment carriage, on the top surface of which is engraved a line 30L that coincides with the rotation center of the turntable 12 and the virtual reference line (Y axis) of the floppy disk 11, and on one end of the top surface, Groove 30A for mounting the magnetic head that matches the external shape of the magnetic head 9
is recessed. A guide portion, for example, a guide hole 31, into which the guide pin 21 is loosely fitted is bored in the center of the bottom surface of the groove 30A, and a through hole 34 for processing the wire of the magnetic head 9 is formed in the bottom surface of the groove 30. It is bored to face the through hole 24. The adjustment carriage 30 is provided with through holes 32 and 33 for screw tightening, which are opposed to the screw holes 22 and 23. The through holes 32 and 33 for screw tightening are made larger than usual, or are made into elongated holes that are long in the direction of the short side of the adjustment carriage 30. The guide hole 31 and the screw tightening holes 32, 32 are arranged on the line 30L. A part of the middle part of the adjustment carriage 30 is connected to the line 30.
It is cut out along L, but this is line 30
The purpose is to use the side surface along the line L as a reference side surface to match the line 20L when fixing the adjustment carriage 30 to the fixed carriage 20, and also to ensure that the magnetic head 9 and the floppy disk 11 are aligned while the floppy disk 11 is rotating. This is to provide a space for attaching the fixed carriage 20 to a disk pad (not shown) used to further improve the contact between the two.

The adjusting carriage 30 is fixed to the fixed carriage 20 by screws 42, 43. Incidentally, since the length of the guide pin 21 is formed to be shorter than the depth of the guide hole 31, there is no gap between the fixed carriage 20 and the adjustment carriage 30.

The thickness of the fixed carriage 20 is formed thinner than the conventional example, and the adjustment carriage 30 is made thinner than the conventional example.
The height of the magnetic head 9 is formed to be the same as that of the conventional example. In this way, the present invention can be applied to a conventional floppy disk drive by simply replacing the carriage without changing the components of the floppy disk drive, such as the turntable 12.

Above, the guide pin 2 is attached to the fixed carriage 20.
1. Although the adjustment carriage 30 is provided with the guide hole 31, the fixed carriage 20 may be provided with a guide hole and the adjustment carriage 30 may be provided with a guide pin. Also, studs and nuts may be used in place of the screws 42 and 43.

Reference numeral 50 denotes a flexible member, which is composed of a pair of mounting plates 51 having an L-shaped longitudinal section and a connecting plate 52 that connects the mounting plates 51. A vertically long through hole (not shown) is bored in the upper part of the vertical plate 51A that constitutes the mounting plate 51, and a horizontal plate 51B that constitutes the mounting plate 5.
A circular hole (not shown) is bored in the hole. The connecting plate 52 is fixed to the middle part of the vertical plate 51A, and the length of the connecting plate 52 is larger than the width of the lead screw holder 5. A metal plate spring, plastic, or the like is used as the flexible member 50.

Reference numeral 53 denotes protrusions protruding from both longitudinal sides of the lead screw holder 5, and a screw hole (not shown) is bored in the center thereof.

The protruding piece 53 is attached to the vertical plate 5 by a screw 54.
1A, and the horizontal plate 51B is fixed to the chassis 1A by screws 55.

Since the flexible member 50 is attached to the lower side of the lead screw holder 5, the shear sea 1A has a lower floor than the shear sea 1 where the bearing part 2 is provided. A stepping motor 6 is fixed to the chassis 1A, and a screw 5
A screw hole (not shown) into which 5 is screwed is bored or dug.

This screw hole is positioned so that the guide shaft 4 and the lead screw 8 are parallel and the center of the guide shaft 4 and the center of the guide hole (not shown) of the guide piece 10A coincide.

Note that the cost of processing materials such as the flexible member 50 and the protruding piece 53 is low.

Next, the operation will be explained. Adjust the magnetic head 9 by adjusting the carriage 30 so that the read/write gap 9A is aligned with the line 30L.
Glue and fix in the groove 30A. Thereafter, the fixed carriage 20 and the adjustment carriage 30 are placed one on top of the other, the adjustment carriage 30 is adjusted so that the lines 20L and 30L and the reference side surfaces coincide, and the screws 42 and 43 are tightened to fix the adjustment carriage 30 to the fixed carriage 20. Then, by rotating the lead screw 8, slide the fixed cartridge 20, and use the inspection disk to check the read/write gear 9A.
Check the azimuth angle of Depending on the machining accuracy of the bearing part 2 and the mounting condition of the guide shaft 4, the read/write gap 9A may be adjusted to the floppy disk 1.
If it does not match the virtual reference line (Y axis) of No. 1, loosen the screws 42 and 43, slide the entire adjustment carriage 30 in the direction of its short side, or rotate the adjustment carriage 30 to make the adjustment. Next, the flexible member 50 is fixed onto the chassis 1A with screws 55. Next, the lead screw holder 5
is secured to the flexible member 50 by screws 54. At this time, the height of the lead screw holder 5 is adjusted using the vertically long through hole of the vertical plate 51A so that the guide shaft 4 and the lead screw 8 are horizontal.

Flexible member 50 fixed on chassis 1A
has its longitudinal direction in the Y direction (lead screw 8
Since it is parallel to the longitudinal direction of the lead screw 8, it does not have a degree of freedom in the Y direction and the Z direction (height direction), and with the screw 55 as the fulcrum, the It has degrees of freedom only in
Therefore, the lead screw holder 5 fixed to the flexible member 50 also has a degree of freedom only in the X direction.

Therefore, in this invention, the azimuth can be easily and accurately adjusted by adjusting the adjusting carriage 30 without affecting the magnetic head 9 itself, which is adhesively fixed to the adjusting carriage 30. Further, since the adjustment carriage 30 is easily adjusted, the azimuth can be adjusted in consideration of the machining accuracy of the bearing portion 2 and the mounting state of the guide shaft 4. Furthermore, the magnetic head 9 is connected to an adjustment carriage 30.
Since it is precisely fixed to the fixed carriage 20 via the magnetic head 9, the magnetic head 9 can be directly attached to the conventional
There are no restrictions on accurate installation.

In this example, a button-shaped single-sided magnetic head is used, but a rectangular head or a double-sided head with a gimbal support may also be used. All you have to do is keep it.

Furthermore, in this invention, unlike the case where the lead screw holder 5 is directly attached to the shear sheath 1, the positioning of the screw hole of the shear sheath 1A does not require much precision. In addition, slight bending or eccentricity of the lead screw 8 is absorbed to some extent by the movement of the lead screw holder 5, so fluctuations in the load torque of the lead screw 8 are reduced, and the amount of off-track can be reduced and reduced. Can be easily reduced. As described above, this invention improves the azimuth accuracy by adjusting the position of the magnetic head, and improves the access position accuracy by reducing the amount of off-track, thereby achieving the data compatibility required for floppy disk drives. can be ensured with high precision.

As explained above, in this invention, the carriage is formed in two layers, the adjustment carriage and the fixed carriage, and a line is engraved on the top surface that coincides with the virtual reference line of the floppy disk, and the guide section is placed on the line. A fixed carriage with two screw holes formed therein, a line engraved on the top surface that matches the virtual reference line of the floppy disk, a groove for mounting a magnetic head on one end of the top surface, and a groove in which the magnetic head is attached. A guide part facing the guide part is formed, and the magnetic head is fixed with adhesive. A screw tightening hole with an adjustment allowance is bored on the line, facing the two screw holes, and the middle part is A portion of the adjustment carriage is cut out along the line to form a reference side surface, and the adjustment carriage is fixed via a screw, and the lead screw holder has a degree of freedom only in the direction perpendicular to the longitudinal direction of the lead screw. By fixing it on the chassis via a flexible member, the azimuth accuracy and access position accuracy are improved, making it possible to achieve high precision data compatibility required for floppy disk drives. The effect is that it can be secured.

[Brief explanation of drawings]

Figure 1 shows the prior art, a is a perspective view, b
2 is a plan view, and FIG. 2 is a diagram showing an embodiment of this invention, in which a is a partially exploded perspective view and b is a plan view. 4... Guide shaft, 5... Lead screw holder, 6... Stepping motor, 8... Lead screw, 10... Carriage, 11... Floppy disk, 20... Fixed carriage, 3
0...Adjustment carriage, 50...Flexible member, 5
3...Protrusion.

Claims (1)

[Scope of utility model registration request] The carriage is slidably and loosely fitted into the guide shaft, which extends over a bearing provided on the chassis and is fixed by a fixture, via a guide piece protruding from one side of the guide shaft. The lead screw is screwed into the middle part of the lead screw via a nut protruding from the other side, and a magnetic head is attached to the top surface of the lead screw. The lead screw holder is screwed onto a lead screw holder that is provided parallel to the lead screw holder at regular intervals, and one end is connected via a joint to a stepping motor mounted on the chassis. The rotation of the motor reciprocally moves the magnetic head in the direction of a turntable, which is provided on the chassis to the left of the magnetic head, has a floppy disk attached thereto, and is rotated by a spindle motor. In the magnetic head access device of a floppy disk drive,
A fixed carriage in which the carriage is formed in two layers, an adjustment carriage and a fixed carriage, above and below, a line is engraved on the top surface that matches the virtual reference line of the floppy disk, and a guide part and two screw holes are formed on the line. A line matching the virtual reference line of the floppy disk is carved on the top surface, a groove for mounting a magnetic head is formed in one end of the top surface, and a guide portion facing the guide portion is formed in the groove. The magnetic head is fixed with adhesive, a through hole for tightening the screw is formed on the line, facing the two screw holes, and has an adjustment allowance, and a part of the middle part is cut out along the line. The adjustment carriage, which is used as a reference side surface, is fixed via a screw, and the lead screw holder is mounted on the shear sea via a flexible member that has a degree of freedom only in the direction perpendicular to the longitudinal direction of the lead screw. A magnetic head access device for a floppy disk drive characterized by being fixed.