JP2597368Y2 - Height setting mechanism for magnetic head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for setting the height of a magnetic head in a tape player.

[0002]

2. Description of the Related Art Conventionally, for example, a tape recorder has a magnetic head for canceling a manufacturing error or the like of each component and accurately setting a height and a right and left inclination (azimuth) of the magnetic head relative to a running magnetic tape. Is provided. As shown in FIG. 5, this type of posture adjustment mechanism includes, as shown in FIG. In some cases, the lower end of the adjusting screw 22 is brought into contact with the cam surface of the shift cam 23 for channel switching. Then, the height of the magnetic head 20 and the azimuth adjustment are adjusted by screwing the adjusting screw 22 to move the mounting member 21 up and down.

[0003]

However, in the above conventional example, when one of the adjusting screws 22 is screwed, the mounting member 21 is inclined with the other adjusting screw 22 as a fulcrum.
There is a disadvantage that the height and the inclination of the magnetic head 20 change simultaneously. Therefore, the posture adjustment work becomes extremely complicated, which hinders a reduction in manufacturing cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a magnetic head height setting mechanism with a simple structure in which the magnetic head setting height does not fluctuate even after azimuth adjustment. It is.

[0005]

To this end, a mechanism for setting the height of a magnetic head in a tape recorder as described below has been created. That is, the present invention moves the magnetic head up and down in the width direction of the magnetic tape and adjusts the azimuth to the left.
In the height setting mechanism of the magnetic head tilted to the right , a magnetic tape is vertically suspended between a mounting member on which the magnetic head is mounted and a supporting member supporting the mounting member.
At the position on the center line of the magnetic head that intersects directly,
A height adjusting member for adjusting the height and the mounting member
And a guide portion for guiding the center line.
Tilting the mounting member to a position separated laterally from
An adjusting member is provided, and the height adjusting member is
Attach the tip of the jack screw provided on the mounting member to the support member side.
A configuration in which the mounting member is tiltably supported by contacting the mounting member.
The guide section is provided with a guide pin rising from the support member.
To the center line provided on the mounting member.
Inserted into the long hole with the intersecting surface
In one direction, and one end of the
The cross-sectional shape is suitable for the guide pin, and the mounting member is left
It is configured to be positioned so that it can be tilted to the right.
Characterized in that that.

[0006]

When the height of the magnetic head is set by the above mechanism, the vertical distance between the mounting member on which the magnetic head is mounted and the supporting member is adjusted by the height adjusting member. Then, the mounting member is guided by the guide portion and moves in the front-rear direction.
The position of the magnetic head is determined without setting the height of the magnetic head. Since the height adjusting member regulates the height of the mounting member near the center line of the magnetic head, that is, the height of the magnetic head, even if the mounting member is tilted left and right for azimuth adjustment, The setting height hardly changes.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the upper part is referred to as “back” and the lower part is referred to as “front”. The terms left and right refer to those in FIGS. As shown in FIGS. 1 to 3, a cylindrical guide pin 1 a is perpendicular to the chassis 1 of the tape recorder in a state where a flange 1 b is brought into contact with the chassis 1 (also referred to as a support member). It is mounted and mounting screw 2a
The guide pin 1a penetrates through the case 2 fixed on the chassis 1. Also, at the rear position of case 2,
A head shift cam 4 for shifting the magnetic head 3 in the width direction of the magnetic tape at the time of channel switching is provided movably in the left-right direction with respect to the case 2. 1 to 3 show a state where the magnetic head 3 is shifted upward.

A head plate 9 fixed to the magnetic head 3 is mounted on a head mount table (also referred to as a mounting member) 5 located above the case 2 by two screws 9a. A cylindrical portion 5a is provided on a center line C perpendicularly intersecting the magnetic surface of the magnetic head 3 and bisecting the magnetic head 3 to the left and right. As shown in FIG. 4, the cylindrical portion 5a into which the guide pin 1a is inserted is provided at the lower end of the cylindrical portion 5a, and has a round hole 5b into which the guide pin 1a is fitted in an appropriate fitting state. An elongated hole 5c is provided upward from the hole 5b and has an oval cross section. The head mount table 5 is configured such that the vertical movement and the left-right tilt are regulated by the guide portion including the guide pin 1a and the cylindrical portion 5a, while the vertical movement and the left-right tilt are allowed.

The head mount table 5 has a structure shown in FIG.
3, a jack screw (also referred to as an adjusting member) 7 for height adjustment is screwed in a position on the center line C and opposed to the cam surface of the head shift cam 4. The head mount table 5 urged downward by the tension spring 6 provided between the chassis 1 and the head mount table 5 has a lower end portion of the jack screw 7 abutting against the cam surface of the head shift cam 4. At a predetermined height.

Further, the head mount table 5 includes
A jack screw 8a for tilt adjustment is screwed at a position off the center line C and facing the cam surface of the head shift cam 4. Also, the head mount table 5
A claw 5d is provided to be vertically movably engaged with the vertical groove 2b formed on the side wall of the case 2, and the guide pin 1a
Around rotation is prevented. The case 2 is integrally formed with a tape guide 2c.

When setting the height of the magnetic head 3 shifted upward in the height setting mechanism configured as described above, refer to FIGS. The head mount table 5 is moved up and down by screwing. Thereafter, when adjusting the azimuth, the head screw 5a is tilted left and right by screwing the jack screw 8a.

In this embodiment, when the head shift cam 4 is moved rightward from the position shown in FIGS. 1 to 3 with respect to the case 2, the lower ends of the jack screws 7, 8a are connected to the head shift cam 4. Away from the cam surface, and the cylindrical portion 5a
The head mount table 5 is lowered until the lower end curved surface 5e of the magnetic head 3 comes into contact with the flange 1b of the pin 1a, and the magnetic head 3 is shifted downward. At this position, the magnetic head 3 has a preset reference height, and the lower end of the tilt adjustment jack screw 8b is in contact with the chassis 1. Therefore, the azimuth adjustment in the downward shift state is performed by inclining the head mount table 5 by screwing the jack screw 8b.

As described above, in the present embodiment, the forward and backward tilting of the magnetic head 3 is restricted by the guide portion including the guide pin 1a and the cylindrical portion 5a, and the guide pin 1a is located on the center line C. The magnetic head 3 is configured to be capable of tilting left and right about the corresponding round hole 5b. Then, when setting the height of the magnetic head 3, it is only necessary to operate one jack screw 7 arranged on the center line C. Therefore, the number of components is reduced as compared with the related art, and the height of the magnetic head 3 can be set very easily. Further, even if the magnetic head 3 is tilted left and right, the set height of the magnetic head hardly changes. Further, if the above-mentioned tilt center is provided at the center position of the magnetic head 3 in the height direction, it is possible to eliminate the fluctuation of the set height when the magnetic head 3 is tilted left and right.

In this embodiment, the axis of the cylindrical portion 5a of the head mount table 5 is arranged on the center line C of the magnetic head 3, but it is set at a position deviated from the center line C. Is also good. Further, a pin or the like may be used instead of the jack screw 7. Further, the head mount table 5 and the head shift cam 4 (or the chassis 1)
In addition, it is also possible to provide parts that abut on each other on the center line C, and to form the abutting positions so as to be adjustable in the height direction. In this embodiment, when the magnetic head 3 is in the downward shift state, the lower end of the jack screw 7 is separated from the cam surface of the head shift cam 4 as described above. A step corresponding to the gap of the magnetic head 3 is formed on the cam surface, and the jack screw 7 is always brought into contact with the cam surface.
Can be configured to define the amount of movement of the cam surface by the cam surface and the jack screw 7.

[0015]

As described above, in the height setting mechanism of the magnetic head according to the present invention, the height of the mounting member is determined by the adjusting member disposed near the center line of the magnetic head. The height of the magnetic head hardly changes even if it is tilted left and right. This makes it easy to set the height of the magnetic head, and eliminates the need to re-adjust the height of the magnetic head when adjusting azimuth, as in the past. There is an effect that can be. In addition, the height setting mechanism has a very simple configuration, which has the effect of reducing manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a plan view of a height setting mechanism of a magnetic head according to an embodiment.

FIG. 2 is a front view of a height setting mechanism of the magnetic head of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a diagram illustrating a conventional magnetic head attitude adjustment mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis (support member) 1a Guide pin (guide part) 3 Magnetic head 4 Head shift cam 5 Head mount table (attachment member) 5a Cylindrical part (guide part) 7 Jack screw (adjustment member) C Center line T Magnetic tape

Claims (1)

(57) [Scope of request for utility model registration] A magnetic head is moved up and down in a width direction of a magnetic tape and tilted in a left and right direction in which azimuth adjustment is possible.
In the height setting mechanism of the magnetic head to be mounted, the space between the mounting member on which the magnetic head is mounted and the supporting member supporting the mounting member is perpendicular to the magnetic surface of the magnetic tape.
The height of the mounting member at a position on the center line of the intersecting magnetic head.
The height adjustment member for adjustment and the mounting member are vertically
And a guide portion is provided from the center line.
Tilt adjustment for tilting the mounting member to a position separated laterally
A member is provided, and the height adjusting member is a jacking member provided on the mounting member.
The tip of the blade is brought into contact with the support member side to tilt the mounting member.
The guide portion is configured to be movably supported, and the guide portion is a guide pin that rises from the support member.
Are provided on the mounting member and are substantially orthogonal to the center line.
To the front and rear of the mounting member
In one direction, and one end of the guide is
The mounting member has a cross-sectional shape that matches the
A height setting mechanism for a magnetic head that is configured to be positioned in such a manner as to be tiltable in a direction .