JPS60247869A - Feeding mechanism of magnetic head - Google Patents

Abstract

PURPOSE:To easily and accurately perform position adjustment of a magnetic head and to increase the capacity of a recording medium, by fitting a moving member by adjusting the relative position of the moving member to a rack under a condition where the rack is engaged with a pinion so that the position of a magnetic head to the track of a magnetic recording medium can be set to a desired position by a fitting means. CONSTITUTION:In a stepped section 11c a rack 20 is fitted by means of a fitting means which can freely adjust its relative position to a moving member 10. As a concrete fitting means elliptical holes 21a and 21b which are larger than screw holes provided in a lower arm 11 and long in the moving direction of the moving member 10 are provided in prescribed locations of the rack 20 corresponding to the screw holes of the lower arm 11 and screws 22a and 22b are passed through the elliptical holes 21a and 21b and fixed into the screw holes by screwing. Under this condition the rack 20 is engaged with a pinion 6 and, when a stepping motor 3 is driven, the pinion 6 is rotated and the rotation is transmitted from the pinion 6 to the rack 20. Then the moving member 10 moves together with the rack 20 and, as the member 10 moves, a magnetic head 14 also moves.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head feeding mechanism, and more particularly to a magnetic head feeding mechanism that can accurately and easily adjust the position of a magnetic head.

2. Description of the Related Art Generally, in a magnetic recording and reproducing device having an 8M magnetic head feed structure, a plurality of magnetic recording media (for example, floppy disks) are exchangeably installed and performing magnetic recording and reproducing (for example, a floppy disk device). , When installing each magnetic recording medium, a reference track is set on the magnetic recording medium so that no deviation occurs in the recording track for each magnetic recording medium, and by aligning this M quasi-track with the magnetic head, the recording track deviation is avoided. was prevented.

In order to align the magnetic head with this reference track, a magnetic head position adjusting means is provided within the magnetic head transport mechanism.

Conventionally, as an adjusting means for aligning the magnetic head and the reference track, the magnetic head detects the reproduction output of the reference track, and the magnetic head is set and fixed at a position where the output signal is maximum. The position of the magnetic head was adjusted by moving the stepping motor itself or by rotating the stepping motor.

However, the above-described magnetic head position adjustment means has the disadvantage that it is necessary to move or rotate a large stepping motor, making it difficult to finely adjust the position of the magnetic head and making it impossible to position the head with high precision. Ta.

Furthermore, since the magnetic head cannot be precisely positioned, there is a drawback that high-density tracks for high-capacity recording on a magnetic recording medium cannot be achieved.

In addition, as another conventional example, there is a magnetic head position adjustment means that is mounted on the side using a steel belt system, but the steel belt becomes loose during adjustment and accurate positioning is not possible. There wasn't.

Problems to be Solved by the Invention The present invention provides a mechanism for attaching a rack and a moving member provided with a magnetic head with one lever (=J means) such that the relative position can be freely adjusted.
Adjust the relative position of the movable member to the rack so that the position of the magnetic head with respect to the track of the magnetic recording medium is at the desired position with the rack and binion engaged, and then adjust the position of the magnetic head by pulling. It is an object of the present invention to provide a magnetic head feeding mechanism that can be adjusted easily and accurately.

Means for Solving the Problems The present invention provides a magnetic head transport mechanism consisting of a pinion rotated by a stepping motor and a rack that meshes with the pinion to move the magnetic head. and a mounting means for attaching the rack to the movable member so that the relative position thereof can be freely adjusted. This is achieved by adjusting the relative position with respect to the rack while the rack is engaged with the binion, and one embodiment thereof will be described below with reference to the drawings.

Embodiment FIG. 1 shows an embodiment of the magnetic head feed m4M according to the present invention. In the figure, reference numeral 1 denotes a chassis, and a spindle motor 2 and a stepping motor 3 are fixed at predetermined positions on the back side of the chassis. The shaft 2a of the spindle motor 2 protrudes from the chassis 1, and a magnetic recording medium 4 (for example, a floppy disk, the storage case is not shown) is attached to the upper part of the protruding part, and a rotation for rotating the magnetic recording medium 4 is provided. Base 5 is installed (pull).

The shaft 3a of the stepping motor 3 protrudes from the chassis 1;
A predetermined part of a is machined with gears, and the shirt 1
3a forms a binion 6.

Further, at a substantially central position of the chassis 1, a shaft 7 of the spindle motor 2 extending toward the shirts 1 to 2a is provided by bending a predetermined portion of the chassis 1 (a holding portion 8a).

8b and fasteners 9a and 911, and a movable member 10 is slidably attached to this shaft 7. 1
A hole 1a (not shown in FIGS. 1 and 2) is bored across the range 1 on which the moving member 10 slides, and the moving member 10 slides within this hole 1a.

As shown in FIGS. 1 and 2, the movable member 10 generally consists of a lower arm 11 and an upper arm 12, each arm 11, 12 extending toward the shaft 2a of the spindle motor 2. There is.

The lower arm 11 is provided with a hole 13 extending through the lower arm 11 in its longitudinal direction, and by fitting the shaft 7 into the hole 13, the movable member 10 is slidably attached to the shaft 7. (=1) Furthermore, a magnetic head 14 is provided at one end 11a of the lower arm 11 near the spindle motor 2.

A bracket 15 having an opening-shaped cross section is fixed to the other end 11 b of the lower arm 11 by a screw 16 . A shaft 17 is provided between the left and right rising portions 15a and 15b of the bracket 15, and the upper arm 12 is supported on the shaft 17, as shown in FIG. Further, a pad 18 is provided at one end of the upper arm 12 at a position corresponding to the magnetic head 14, and at the other end, a force is applied to rotate the upper arm 12 counterclockwise around a shaft 17. A spring 19 is attached. Due to this spring force, the pad 18 always presses the magnetic head 14 with an appropriate suppressing force.

Note that during magnetic recording and reproduction, the magnetic recording medium 4 is mounted between the magnetic head 14 and the pad 18, so the magnetic recording medium 4 is held with an appropriate pressing force and the magnetic head 14 is held between the magnetic recording medium 4 and the pad 18.
There is no possibility that the magnetic recording medium 4 and the magnetic recording medium 4 are separated from each other, thereby preventing recording/reproduction failures and the like.

Further, as shown in FIG. 3, a step portion 11C is provided on one side of the end portion 11b of the lower arm 11, and the step portion 11c is provided with a step portion 11C for freely adjusting the relative position with respect to the movable member 1o. The rack 20 is attached using the attachment means obtained.

As a specific attachment means, as shown in FIG.
(7) Hole 21a is provided with vertically long elliptical holes 21a and 21b in the direction of movement of the screws 122a and 22b.
.

21b and screw it into the screw hole. In this state, the rack 20 and the binion 6 are engaged, so when the stepping motor 3 is driven, the binion 6 rotates, this rotation is transmitted from the binion 6 to the rack 20, and the moving member 10 moves together with the rack 2o. , therefore magnetic head 1
4 moves.

Furthermore, a shaft 23 is provided on the other side of the end 11b of the lower arm 11.
is installed perpendicularly to the surface of the lower arm 11 a3, a bearing 24 is attached to the upper end of this shaft 23, and a pressing plate 25 is in contact with this bearing 24.

As shown in FIG. 3, the suppression plate 25 has a shaft bearing portion 25a.

Consisting of a vertical portion 25b and a horizontal portion 25c, the bearing portion 25a is supported on a shaft 27 attached to a bracket 26 having a substantially U-shaped cross section and attached to an appropriate position on the chassis 1, and the vertical portion 25b is attached to a bearing. 24, and one end of the spring 28 is connected to the horizontal portion 25c. The other end of the spring 28 is connected to the rising portion 26 of the bracket 26.
a, and the spring 28 applies a force to pull the horizontal part 25c upward, so that the spring 28 causes the pressing plate 25 to rotate around the shaft 27, and the vertical part 25b
presses the bearing 24. Note that the length dimension in the longitudinal direction of the vertical portion 25b is selected to be approximately equal to or larger than the moving distance that the bearing 24 moves following the movement of the moving member 10, so that the vertical portion 25b does not move. The bearing 24 is always suppressed over the range of movement of the member 10.

This pressing force is transmitted to the moving member 10 via the bearing 24 and the shaft 23, the moving member 10 rotates counterclockwise about the shaft 7, and the rank 20 presses the pinion 6.

Therefore, backlash occurring between the pinion 6 and the rack 20 is prevented, and the drive of the stepping motor 3 is transmitted from the pinion 6 to the rack 20 with high precision.

Further, as shown in FIG. 2, at a predetermined position facing the end surface 10a of the movable member 10, a plate portion 30 to which a magnetic head position adjustment screw 29, which will be described later, is attached is integrally formed with the chassis 1. The plate portion 30 has a hole 3 through which the adjustment screw 29 is inserted.
1 is bored, and this hole 31 corresponds to the moving member 1.
As shown in FIG.
A screw hole 31 for screwing is provided. In addition, when the magnetic head 14 coincides with the reference track position on the recording medium 4, the chassis 1 and the moving part +K i O
A moving member stopping mechanism for stopping the movement of 0 is incorporated. This moving member stopping mechanism includes a shielding plate 32. Optical sensor 33. It is composed of a bracket 34 and the like.

The shielding plate 32 is a plate having an oval shape in cross section, and has a vertical portion 32a fixed to a predetermined position on the side of the lower arm 11 of the movable member 10, and a horizontal portion 32b thereof extending from the movable member 10. The optical sensor 33 has a substantially U-shaped cross section with a space 33a inside, and a light emitting element 35 and a light receiving element 36 are placed above and below the space 33a, and the bracket 34 The horizontal part 32b of the shielding plate 32 is attached (fixed) to the chassis 1.The horizontal part 32b of the shielding plate 32 has its height position and extension length adjusted so that it can enter the space 33a of the optical sensor 33 as the movable member 10 moves. has been selected.

Here, since the reference track is generally the outermost track of the recording medium 4, when the movable member 1o is moved downward from the position shown in FIG. 1, the shielding plate 32 is also moved downward with this movement. , the horizontal portion 32b enters into the space 3'3a of the optical sensor 33, as shown in FIG. Due to this intrusion, the horizontal portion 32b of the shielding plate 32 blocks the light from the light emitting element 35, which is detected by the light receiving element 36 and the movement of the moving member 10 is stopped. Therefore, at the position where the magnetic head 14 coincides with the reference track, the shielding plate 32 closes the light emitting element 35.
If the positions of the shielding plate 32 and the optical sensor 33 are selected so as to block the light of the magnetic head 14, the movable member 10 can
It will automatically stop at the position where the reference track and the reference track match.

In addition, the stepping motor 3 generally has four phases of windings (for example, four phases of △, B, A, and B), and two of these four phases of windings are
Voltage is applied to each phase sequentially (in a two-phase excitation force formula, the voltage applied to each winding changes over time. For example, phases A and B are excited at the same time as indicated by diagonal lines in Figure 5). As shown in the figure, the same combination of windings is used once every four steps.Therefore, after detecting the stop signal with the light receiving element 36 (the detection signal is indicated by H in the figure), the first predetermined set of windings is used. The stepping motor 3 is configured to stop at the matching phase (for example, AB phase).Thereby, the magnetic head 14 can be aligned with the reference track with high precision.

The adjusting means for aligning the magnetic head 14 with the reference track in the magnetic head feeding mechanism J5 having the above configuration will be described below.

Generally, slight misalignment between the magnetic head 14 and the reference track may occur due to assembly errors that occur during device manufacturing, or due to unexpected accidents (such as applying a shock to the device) during device use. Think about it. To adjust this positional deviation, first drive the stepping motor 3 to move the moving member 10 downward as shown in FIG. As shown in the figure, after inserting the adjustment screw 29 into the hole 31 of the plate part 30 provided in the chassis 1 and attaching the compression spring 37, the adjustment screw 29 is screwed into the screw hole 31 carved in the end surface 10a of the moving member 10. let

Next, the screws 22a and 22b screwing the rack 20 onto the moving member 10 are loosened. At this time, the side part 20a of the rack 20 is connected to the stepped part 11 provided on the moving part +J10.
The rank 20 presses the pinion 6 because the movable member 10 is held on the side surface of the pinion C and is biased by a counterclockwise force around the shaft 7 by the pressing horn of the pressing plate 25. Therefore, rank 20 and binion 6 are screw 2
2a.

Even after loosening 22b, the engaged state is maintained.

In addition, the screws 22a and 22b are loosened and the rack 20 has an oval hole 21 with a vertical bar in the sliding direction.
a and 21b are provided, the rack 20 can slide along the stepped portion 11C of the movable member 10, and therefore the relative positions of the movable member 10 and the rank 20 can be adjusted.

Here, a microscope (not shown) is placed near the magnetic head 14, and while looking at the microscope, the adjustment screw 29 is rotated and moved so that the center of the core of the magnetic head 14 coincides with the center position of the M semi-track. The member 10 is moved relative to the rank 20 to adjust the position of the magnetic head 14. During this adjustment, the binion 6 and the rack 20 maintain their meshing state. Further, a compression spring 37 is attached to the adjustment screw 29, and this compression spring 37 is always attached to the plate portion 37 during adjustment.
and the end surface 10a of the moving member 10, the thread of the adjustment screw 29 is pressed against the thread of the screw hole 31, and misalignment due to the screwing of the adjustment screw 29 and the screw hole 31 is prevented. .

Next, after adjusting the center of the core of the magnetic head 14 to the center position of the reference trunk, in this state, the screws 22a, 2
2b again to fix the rack 20 to the moving member 10. As a result, the magnetic head 14 is accurately adjusted to the reference track position and the mounting is fixed.

Note that when using the magnetic head feeding mechanism, the adjustment screw 29
．． Compression spring 37 and microscope have been removed.

Effects of the Invention As described above, the magnetic head feeding mechanism of the present invention includes a moving member that is provided with a magnetic head and moves together with the rack, and a mounting means that attaches the rack to the moving member so that its relative position can be adjusted. By adjusting the relative position of the movable member with respect to the rack with the rack meshed with the binion so that the position of the magnetic head with respect to the track of the magnetic recording medium is at the desired position using the mounting means, Accurate positioning is achieved because the position of the magnetic head is adjusted by moving the rack and moving member relative to each other using a mounting means that can freely adjust the relative position of the rack and moving member without moving the stepping motor. Also, since the rack and binion are adjusted in position while being engaged with a certain pressing force, the rack and binion will not separate or move during adjustment, eliminating adjustment errors caused by the rack and binion. Furthermore, since the means of position adjustment is simply rotating the adjustment screw while looking at a microscope, the adjustment work can be easily performed.Also, since the position of the magnetic head can be adjusted easily and accurately, it is also useful for increasing the capacity of recording media. It has features such as being able to respond to

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the magnetic head feeding mechanism according to the present invention, FIG. 2 is a side view of the main part of FIG. 1 for explaining the moving member and the magnetic head position adjusting means, and FIG. is a plan view taken along the line ■-■ in Figure 1, Figure 4 is a plan view of the main part taken along the line rv-rv in Figure 1, and Figure 4 is a plan view of the main part taken along the line The figures are timing charts 1 to 1 showing the timing of detecting the stop position of the moving member from the excitation phase of the optical sensor and the stepping motor. 1... Chassis, Ia, 13.21a, 21b. 13... Hole, 3. ...Stepping motor, 4...
Magnetic recording medium, 6... Binion, 10... Moving member, 10a... End face, 11... Lower arm, 11c.
...Stepped portion, 12... Upper arm, 14... Magnetic head, ]6゜22a, 22b... Screw, 20...
・Rack, 24...Bearing, 25...Press plate,
29... Adjustment screw, 32... Shielding plate, 33... Optical sensor, 37... Compression spring. Figure 1-4 Figure 5

Claims (1)

[Claims] A magnetic head transport mechanism comprising a pinion rotated by a stepping motor and a rack that meshes with the pinion and moves the magnetic head, in which the magnetic head is installed and moves together with the rack. member, and the rack is attached to the movable member so that the relative position can be adjusted (=I
and means for adjusting the position of the magnetic head with respect to the track of the magnetic recording medium to a desired position by the mounting means. Magnetic head feeding mechanism that is adjusted and installed.