JPH07118179B2 - Head azimuth angle adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to a head azimuth angle adjusting device, and is particularly suitable for application to a magnetic sheet recording / reproducing device.

B. SUMMARY OF THE INVENTION The present invention provides a magnetic sheet recording / reproducing apparatus adapted to track a head to a track formed on a magnetic sheet mounted on a spindle, by adjusting the relative positions of the spindle and the head. The head azimuth angle can be adjusted with high accuracy.

C Related Art Conventionally, as the magnetic sheet recording / reproducing apparatus of this type, the one having the configuration shown in FIG. 5 has been proposed. FIG. 5 is a rear view of the magnetic sheet recording / reproducing apparatus. The L-shaped carriage 1 has an arm body portion 3 guided by a first guide rail 2 and a tip portion of a second portion. It has an arm portion 6 which is guided by a guide rail 4 and has a magnetic head 5 mounted on the central surface side.

The first and second guide rails 2 and 4 extend substantially in parallel through both positions of the spindle 8 which is arranged on the front surface side and on which the rotating magnetic sheet 7 is mounted, and thus the carriage 1
Is moved on the guide rails 2 and 4, the head 5 moves along an imaginary line L ₁ passing through the center of the spindle 8. Incidentally, 9 is a spindle motor, and 10 is a bearing of the spindle 8.

The carriage 1 is stepwise positioned at a predetermined position on the guide rails 2 and 4 by, for example, a stepping motor (not shown), so that the head 5 is imaginary.
On L ₁ , a plurality of recording tracks 11 on the rotating magnetic sheet 7 can be tracked respectively.

In the case of such a configuration, when the gear of the head 5 moves from the tracking position intersecting the innermost track to the tracking position intersecting the outermost track, the intersection angle (ie, azimuth angle) θ of the gears with respect to each track is Amount of change (this is called azimuth angle accuracy)
Is determined by the precision of parts such as the attachment mechanism portion of the head 5 and the movement mechanism portion of the carriage 1.

Therefore, depending on the purpose of use of the magnetic sheet recording / reproducing apparatus, the azimuth angle accuracy Δθ is a value coarser than the component accuracy (for example, Δθ =
If it is selected to be about ± 30 '), it is possible to realize a magnetic sheet recording / reproducing apparatus which sufficiently satisfies the azimuth angle accuracy Δθ on the format without providing an adjusting mechanism for the head 5.

D Problem to be Solved by the Invention However, when the azimuth angle precision Δθ higher than the component precision is required (for example, Δθ = ± 6 ′), the azimuth angle precision Δθ of the head 5 is driven to high precision. It is necessary to prepare a means for adjusting the azimuth angle of the head 5 so that the above can be achieved.

As an adjusting method for coping with such a demand, a method of adjusting the mounting angle of the head 5 so as to match the azimuth angle .theta. In practice, in order to realize this, the mechanism for attaching the head 5 to the carriage 1 has an adjusting function so that the azimuth angle θ of the head 5 (FIG. 5) can be adjusted. However, in order to improve the azimuth angle accuracy Δθ while reducing the overall configuration as much as possible, a method of adjusting the azimuth angle accuracy using the attachment mechanism of the head 5 is not practical.

For example, when an in-line double head is used as the head 5, the tilt angle, R balance, and height of the head 5 with respect to the magnetic sheet 7 must be simultaneously adjusted with high accuracy. In order to do so, it is necessary to actually provide an independent adjusting mechanism for each, and thus it is inevitable that the structure around the head becomes large.

The present invention has been made in consideration of the above points, and is intended to obtain an azimuth angle adjusting device capable of adjusting the azimuth angle accuracy Δθ with a higher accuracy than the part accuracy without providing an adjusting mechanism in the head portion. is there.

E Means for Solving the Problems In the present invention, in order to solve the problems, a magnetic sheet recording is made so that the head 5 is tracked by the track 11 formed on the magnetic sheet 7 mounted on the spindle 8. In the reproducing apparatus 12, a head moving mechanism including a carriage 1 for holding the head 5 and guide rails 2, 4 for guiding the carriage 1 in the radial direction of the magnetic sheet 7, a guide rail 2 from the rotation center of the spindle 8, The second imaginary line L ₃ parallel to the first imaginary line L ₁ extending in the moving direction of 4 and separated by a predetermined distance from the head 5
And a moving mechanism 26 for adjusting the rotation center of the spindle 8 in a direction orthogonal to the first imaginary line L ₁ so that the movement track of the innermost azimuth of the innermost track of the head 5 is provided. The moving mechanism 26 is adjusted so that the outermost azimuth angle from the angle to the outermost track is within a predetermined range.

If the relative position of the spindle 8 and the head 5 is changed by the F action moving mechanism 26 in the direction orthogonal to the tracking direction of the head 5, the azimuth angle θ of the head 5 with respect to the track changes accordingly. . Thus, the azimuth angle accuracy Δθ can be adjusted with a simple configuration and high accuracy.

G. Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings, in which parts corresponding to those in FIG.

In FIG. 1, reference numeral 12 denotes a magnetic sheet recording / reproducing apparatus as a whole, and a spindle motor 9 is provided at a substantially central position of a frame 13.
Is installed. The spindle motor 9 has a fixed platen 14, and as shown in FIG. 2, a long hole provided on an imaginary line L _1.
15 can be screwed to the frame body 13 with a screw 16.

In addition, guide grooves 16A and 16B extending in the direction orthogonal to the imaginary line L ₁ (this is referred to as the left-right direction) are provided at both ends of the fixed platen 14.
And a notch 17 on both sides thereof. This guide groove
16A and 16B are guide pins 18 that are planted on the back surface of the frame 13.
It is guided by A and 18B so that it can move left and right (second
Thus, the position of the spindle motor 9 in the left-right direction can be adjusted. The notch 17 is screwed by a screw 19 so that the spindle motor 9 holds the adjusted position.

Also, an engagement pin provided on the arm body 3 of the carriage 1
The output shaft 24 of the stepping motor 23 is connected to 20 (FIG. 2) via gears 21 and 22 in sequence, and the carriage 1 is guided by the guide rails 2 and 4 in accordance with the rotation of the output shaft 24. While moving, the head 5 can be tracked to each track on the rotating magnetic sheet 7 on the imaginary line L ₁ .

In addition to the above configuration, opposed to the stationary platen 14 of the spindle motor 9, as shown in FIG. 2, by sandwiching the imaginary line L ₁ on the imaginary line L ₂ extending in a direction perpendicular to the virtual line L ₁ A pair of engagement holes 25A and 25B are bored at the positions where the engagement pin 27A of the azimuth angle adjusting tool 26 is inserted into the pair of engagement holes 25A and 25B.
And 27B are adapted to engage.

As shown in FIG. 1, the azimuth angle adjuster 26 has female threads formed on a protrusion 28 provided on one end of the upper surface and guide protrusions 29A and 29B provided on both sides of the other end. Adjustment tool body 30, a male screw 32 having a knob portion 31 at one end, and a female screw 33 into which the male screw 32 is screwed, and an adjusting through hole is formed on the lower surface.
The sliding plate 34 is provided with a pair of engaging pins 27A, 27B corresponding to 25A, 25B, and by rotating the knob portion 31, the sliding plate 34 is moved forward and backward in the extension direction of the male screw 32. There is.

In the above configuration, the azimuth angle θ of the head 5 is determined by using the azimuth angle adjusting tool 26 to determine the position of the spindle 8 by the imaginary line L ₁
From left to right to adjust.

That is, the engagement pins 27A and 27B of the azimuth angle adjuster 26 are engaged with the engagement holes 25A and 25B of the fixed board 14 to rotate the knob portion 31. At this time, the male screw 32 is screwed into the female screw 33,
Alternatively, by being unscrewed, the fixed platen 14 is moved back and forth in a direction substantially orthogonal to the tracking direction of the head 5. When the movement locus L ₃ of the head 5 deviates from the imaginary line L ₁ passing through the center of the spindle 8 in the left or right direction in this way, as shown in FIG.
The azimuth angle accuracy Δθ can be adjusted.

That is, the azimuth angle θ becomes θ as the head 5 tracks from the outermost track to the innermost track.
Increases from ₁ to theta _2, also increases as the moving locus L ₃ of head 5 parallel to the imaginary line L ₁ is further away from the imaginary line L _1. By moving the position of the movement locus L ₃ of the spindle 8 with respect to the center of the fixed platen 14 in the left-right direction, the azimuth angle accuracy Δθ can be driven in with high accuracy.

Therefore, according to this embodiment, the azimuth angle θ of the head 5 can be easily adjusted with high accuracy, and since a complicated adjusting mechanism is not provided in the head portion, the structure around the head can be downsized.

Incidentally, in this embodiment, the engaging holes 25A, 25B of the fixed platen 14
And two engaging pins 27 of the azimuth angle adjusting tool 26.
Although two A and 27B are provided, the number of the engaging holes and the number of the pins may be one or three or more, respectively.

FIG. 4 shows another embodiment of the present invention, in which the tip end of the eccentric driver 36 or 37 is inserted into the adjusting hole 35A or 35B on the side of the frame 13 near the outer periphery of the fixed plate 14 and rotated to rotate the eccentric. driver
The side wall 38 or 39 of 36 or 37 presses the outer peripheral edge of the fixed plate 14 to adjust the position of the spindle 8.

In this case, since the guide grooves 16A and 16B of the fixed platen 14 are attached to the pins 18A and 18B erected in the frame body 13 with some gaps in the vertical and horizontal directions, the fixed platen 14 is fixed.
Is pushed diagonally with respect to the tracking direction of the head 5, and its position is adjusted. However, the fixed plate
When 14 is continuously pressed in an oblique direction with respect to the tracking direction of the head 5, the guide pin 18A or 18B causes an imaginary line L ₁
The fixed platen 14 moves in a direction substantially orthogonal to.

Therefore, according to this embodiment, the position of the spindle 8 can be corrected and the azimuth angle accuracy Δθ can be adjusted with high accuracy only by using the eccentric driver 36 or 37 without using a complicated jig.

In the case of the embodiment shown in FIGS. 1 and 2, the spindle 8
Although the azimuth angle accuracy Δθ is adjusted by moving, the mounting position of the head 5 is moved in a direction substantially orthogonal to the tracking direction of the head 5 or in an oblique direction, or the head 5 is rotated to move the head 5. Azimuth angle accuracy Δ
The θ may be adjusted.

H Effect of the Invention Since the positions of the spindle 8 and the head 5 can be relatively adjusted in a direction substantially orthogonal to the tracking direction of the head 5 or in an oblique direction, a highly accurate azimuth can be obtained with a simple structure. It is possible to easily obtain the azimuth angle adjusting device of the head 5 capable of adjusting the angular accuracy Δθ.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a head azimuth angle adjusting device according to the present invention, and FIG. 2 is a fixed plate of the embodiment shown in FIG.
14 is a plan view, FIG. 3 is a schematic diagram showing changes in azimuth angle, FIG. 4 is a perspective view showing another embodiment of the present invention, and FIG. 5 is a rear view of a conventional magnetic sheet recording / reproducing apparatus. Is. 1 ... Carriage, 2, 4 ... Guide rail, 5 ... Head, 7
... magnetic sheet, 8 ... spindle, 9 ... spindle motor, 10 ... bearing, 11 ... track, 12 ... magnetic sheet recording / reproducing device, 13 ... frame body, 14 ... fixing plate, 15 ... long hole, 16A, 16B ... guide groove , 17 ... Notch, 18A, 18B ... Guide pin, 20 ... Engagement pin, 2
3 ... Stepping motor, 25A, 25B ... Engagement hole, 26 ... Azimuth angle adjusting tool, 35A, 35B ... Adjustment hole, 36, 37 ... Eccentric driver.

Claims (1)

[Claims] 1. A magnetic sheet recording / reproducing apparatus adapted to track a head to a track formed on a magnetic sheet mounted on a spindle, and a carriage for holding the head and a diameter of the carriage for holding the head. A head moving mechanism including a guide rail that guides in a direction, and a second imaginary line that is parallel and separated from the first imaginary line that extends in the moving direction of the guide rail from the rotation center of the spindle by a predetermined distance. A moving mechanism that adjusts the center of rotation of the spindle in a direction orthogonal to the first imaginary line so that the head moves along the track, and the innermost azimuth of the innermost track of the head. Adjust the above moving mechanism so that the azimuth angle of the outermost track from the angle to the outermost track is within a predetermined range. Characteristic head azimuth angle adjustment device.