JPH0341284Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> The present invention relates to a vertical adjustment device for a head, and is capable of finely adjusting the azimuth of the head from a reference position previously obtained using a vertical adjustment screw. , suitable for forming a device for automatic vertical adjustment in combination with detection means.

<Prior Art> The present applicant has developed a head vertical adjustment device that makes it possible to finely adjust the azimuth of the head from a reference position by interposing a wedge-shaped slide adjustment member between the vertical adjustment screw and the head base. was proposed in Utility Model Application No. 54-83130 (Utility Model Application No. 58-14424).

<<Problems to be solved by the invention>> However, the inclined surface of the slide adjustment member and its guide mechanism require extremely high precision, and miniaturization is required due to the arrangement condition of interposing it between the vertical adjustment screw and the head base. There was a problem.

<Means for solving the problems> In order to solve the above-mentioned problems, the device of the present invention has the following features:
a base, a head mounting plate disposed on one side of the first base on which the magnetic head is placed, and a head mounting plate disposed between the first base and the head mounting plate and arranged at the height position of the magnetic head. a second base rotatably supported with respect to the first base; a vertical adjustment screw for adjusting the position; a biasing means for urging the head mounting plate so that the tip of the vertical adjustment screw and the head mounting plate come into pressure contact; and a biasing means for finely adjusting the azimuth of the magnetic head from the reference position. , and control means for controlling the rotational position of the second base.

<<Operation>> By controlling the rotational position of the second base, the control means presses and displaces the head mounting plate via the vertical adjustment screw, thereby finely adjusting the azimuth of the magnetic head from the reference position.

<<Example>> Hereinafter, an example of the present invention will be described with reference to the drawings. Note that FIGS. 1 to 4 show a front view, a rear view, a plan view, and a side view of essential parts, respectively.

A head base 3 is mounted on the upper surface of the chassis ₁ and is slidable in the vertical direction in FIG. ₃ by means of bearings 2 ₁ and 2 ₂ . The first base 5 ₁ is fixed by screws 6 ₁ and 6 ₂ .

Below the base ₅₁ is a head mounting plate ₇₁ on which a recording head 6 is mounted on one end of the head mounting surface 8.
The spacer 4 1 is arranged to face the base 5 ₁ so that its upper surface 9 is substantially parallel to the base 5 1 , and the spacer 4 ₁ is inserted into the through hole 10 provided in the approximate center thereof, and the head is attached to the stepped portion 11 ₁ formed on the spacer 4 _{1 .} A biasing force toward the base ₅₁ is applied by a spring ₁₂₁ elastically compressed between the plate ₇₁ and the head mounting surface 8.

Further, the base ₅₁ has an adjustment screw 13 whose tip is pressed against the upper surface ₉ of the head mounting plate ₇₁ at a required interval in the depth direction of the gap 61 forming surface a-a of the recording head 6, and an adjustment screw 13 for tilt adjustment. The height adjustment screw 15 1 is engaged with the screw 14 and is engaged with the adjustment screw 13 and the tilt adjustment screw 14 as shown in FIG _.
is pivoted.

Therefore, the rotation of the tilt adjustment screw 14 causes the adjustment screw 13 to rotate in the opposite direction via the height adjustment screw 15 ₁ , so the tilt of the recording head 6 is adjusted, and the rotation of the height adjustment screw 15 1 causes the adjustment screw 13 to rotate in the opposite direction via the height adjustment screw 15 ₁ . Since the tilt adjustment screw 13 and the tilt adjustment screw 14 rotate in the same direction, the height of the recording head 6 is adjusted. The details of these adjusting screws 13, 14, and ₁₅₁ are disclosed in Utility Model Application No. 104521/1989 filed by the applicant of the present application.
-14423) and Jitsugan No. 181083 (Sho 57)
-40417) is referred to.

In addition, the base 5 ₁ has a head mounting plate 7 ₁ at its tip.
Vertical adjustment screw 1 so that it comes into pressure contact with the upper surface 9 on the other end side.
6 are screwed together, and the azimuth of the recording head 6 is adjusted by rotation of this vertical adjustment screw 16.

Similar to the above-mentioned head mounting plate ₇₁ , below the base ₅₁ there is a head mounting plate ₇₂ on which the playback head 17 is mounted on one end of the head mounting surface 18.
The spacer 4 2 is inserted into the through hole 20 provided approximately in the center of the spacer 4 ₂ , and the stepped portion 1 formed on the spacer 4 ₂ is arranged to face the base 5 1 so as to be approximately parallel to the spacer 4 ₂ .
A biasing force toward the base _{51 is applied by a spring 122 elastically} compressed between _the head mounting surface 18 of the head mounting plate ₇₂ .

The base 5 ₁ also has a playback head 17 at its tip.
An adjustment screw 211 that presses against the upper surface 19 of the head mounting plate 7 ₂ and a tilt adjustment screw 22 are screwed together at a required interval in the depth direction of the gap 17 ₁ forming surface b-b, as shown in FIG. 3. Adjustment screw 21 as shown
A height adjustment screw 15 ₂ screwed into the tilt adjustment screw 22 is pivotally supported.

Therefore, as described above, by rotating the tilt adjustment screw 22, the adjustment screw 2 is adjusted via the height adjustment screw ₁₅₂ .
1 rotates in the opposite direction, the tilt of the playback head 17 is adjusted, and as the height adjustment screw ₁₅₂ rotates, the adjustment screw 21 and the tilt adjustment screw 22 rotate in the same direction, so the height of the playback head 17 is adjusted. Ru.

Furthermore, a bent portion 5 formed on the back side of the base _51
1 ', an arm 23 is rotatably supported on a shaft 24, and a second arm 24 is provided at the upper end of the arm 23, which is substantially parallel to the base ₅₁ .
A base ₅₂ is formed. A vertical adjustment screw 25 whose tip is pressed against the upper surface 19 of the other end of the head mounting plate 7 ₂ is screwed into the base 5 ₂ , and the azimuth of the playback head 17 is adjusted by rotation of the vertical adjustment screw 25 . is adjusted to the reference position.

On the other hand, as shown in FIGS. 2 to 4, a motor 27 is fixed on the sub-chassis 26 by screws 28 ₁ and 28 ₂ , and a gear 29 1 that meshes with a worm gear 28 press-fitted into the motor shaft 27 ₁ is mounted on the sub-chassis ₂₆ . It is supported by a shaft 30. The tip of the worm gear 28 is pressed by a leaf spring 32 fixed by a screw 31 to prevent the motor shaft 27 ₁ from wobbling in the axial direction.

The rotating shaft 33 ₁ of the potentiometer 33 fixed by a screw 34 has a cam 36 on its upper surface 35 ₁ .
A gear 35 having a shape formed therein is press-fitted and meshes with a gear 29 ₂ integrally formed on the upper surface of the gear 29 ₁ .
The center portion of the lever 37 is rotatably supported by a shaft 38, and the circumferential surface of a trace pin 39 supported at one end of the lever 37 is pressed against the cam surface ₃₆₁ , so that the lever 37 is rotated by the rotation of the cam 36. Therefore, it rotates.

The rear surface 1 ₁ of the chassis 1 has its elongated holes 41 ₁ , 41
A slider ₄₁ is attached to the slider ₄₁ , which is movable in the left-right direction in FIG _. The planted shaft 42 ₁ is the lever 37
It is loosely fitted into the elongated hole ₃₇₁ formed at the other end, and
A shaft 42 ₂ erected approximately in the center is loosely fitted into a long hole 23 ₁ formed at the other end of the arm 23 .

In the apparatus having the above configuration, first, the operation of adjusting the azimuth of the reproducing head 17 to a reference position matching the azimuth recorded on the reference tape upon completion of assembly of the apparatus will be explained. Incidentally, the azimuth of the recording head 6 is of course also adjusted, but its explanation will be omitted here.

First, the cam 36 is activated by the required motor drive circuit (not shown) including the potentiometer 33.
The rotation of the motor 24 is controlled so that the motor 24 is at an intermediate position in its rotation range. Then, the lever 37 rotates around the shaft 38 due to pressure contact between the trace pin 39 and the cam surface ₃₆₁ , and this rotational displacement is caused by the long hole 37.
The movement of the slider ₄₁ is transmitted to the arm 23 through the connection between the shaft 42 ₂ and the elongated hole 23 1, and the movement of the slider 41 is transmitted to the arm 23 through the connection between the shaft 42 ₂ and the elongated hole 23 ₁ , and the movement of the slider 41 is transmitted to the arm 23 through the connection between the shaft 42 ₂ and the elongated hole 23 ₁ . Almost parallel. In this state, play back the reference tape on which the reference signal for azimuth adjustment has been recorded, and set the vertical adjustment screw 2 so that the phase difference between the playback signals from the left and right tracks of the playback head 17 becomes zero.
5 to adjust the azimuth of the reproducing head 17 to the reference position.

Next, in order to match the azimuth of the playback head 17 with the azimuth of the recording head 6, in advance of an auto-calibration operation that appropriately adjusts the bias and level for a blank tape, for example,
The operation when making fine adjustments will be explained.

First, a reference signal is recorded on the left and right tracks on a blank tape (not shown) by the recording head 6, and the azimuth error signal indicating the phase difference between the reproduced signals from the left and right tracks by the reproduction head 17 is detected by the potentiometer. 33 to the required motor drive circuitry (not shown).

Then, the motor drive circuit controls the rotation of the motor 24 so that the phase difference between the reproduced signals disappears, and when the motor 24 rotates the cam 36 in the same manner as described above, the lever 37 is pressed by the trace pin 39 and the cam surface ₃₆₁ . rotates around the shaft 38, and this rotational displacement is transmitted to the slider ₄₁ through the connection between the elongated hole ₃₇₁ and the shaft 421.
The movement of the slider 41 is transmitted to the arm 23 through the connection between the shaft 42 ₁ and the elongated hole 23 ₁ .
Therefore, the arm 23 rotates around the shaft 24, and the head mounting plate 7 ₂ is rotated by the tip of the vertical adjustment screw 25.
The azimuth of the reproduction head 17 is finely adjusted from the reference position by pressing and displacing the head.

In addition, in the above embodiment, the shaft 4 of the slider 41
₂ is parallel to the moving direction of the head base 3, so even if the head base 3 slides according to the play mode and stop mode, the arm 23
The rotation angle of the reproducing head 17 does not change at all, and the azimuth of the reproducing head 17 can be kept constant.

The present invention is not limited to the above embodiments, and can take various forms, for example, the arm 23.
without having it pivoted on the bent part 5 ₁ ' of the base 5 ₁ .
It may be rotatably supported on the head base 3.

Further, in the above embodiment, the adjusting screws 21, 2
Although the tilt and height of the reproducing head 17 can be adjusted by means of 2 and 15 ₂ , the present invention is not limited to this configuration, and may be configured so that the adjustment is not possible. Also,
The head mounting plate 7 ₂ may be arranged above the bases 5 ₁ and 5 ₂ .

<<Effect of the invention>> According to the invention, the vertical adjustment screw screws into the second
The azimuth of the magnetic head can be finely adjusted from the reference position with a simple configuration in which the base is rotatable. Further, since there is no need for an adjustment member with an inclined surface and a guide mechanism for the adjustment member as in the prior art, the accuracy is high, and the arrangement conditions do not require much miniaturization, so the design and manufacture are easy.

[Brief explanation of drawings]

FIGS. 1 to 4 show a front view, a back view, a plan view, and a side view of essential parts, respectively, showing an embodiment of the present invention. 1... Chassis, 3... Head base, 4 ₂ ...
... Spacer, 5 ₁ ... First base, 5 ₂ ... Second base, 12 ₂ ... Spring, 7 ₂ ... Head mounting plate, 15 ₂ ... Height adjustment screw, 17 ... Reproduction Head, 21...Adjustment screw, 22...Tilt adjustment screw, 23...Arm, 25...Vertical adjustment screw, 2
7...Motor, 28...Worm gear, 29 ₁ ,
29 ₂ , 35... Gear, 33... Potentiometer, 36... Cam, 37... Lever, 41...
Slider.

Claims (1)

[Claims for Utility Model Registration] A first base; a head mounting plate disposed on one side of the first base on which a magnetic head is mounted; the first base and the head mounting plate a height-defining member disposed between the magnetic head and the magnetic head, which defines the height position of the magnetic head; a second base rotatably supported with respect to the first base; a vertical adjustment screw screwed onto the base of the magnetic head for adjusting the azimuth of the magnetic head to a predetermined reference position; A vertical adjustment device for a head, comprising: urging means for urging the magnetic head; and control means for controlling the rotational position of the second base in order to finely adjust the azimuth of the magnetic head from the reference position.