JPH0715734B2 - Tape head magnetic head device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocal recording / playback tape in which the track position of the magnetic tape is switched by the rotation of the magnetic head in accordance with the forward / reverse direction constant speed running state of the magnetic tape. The present invention relates to a magnetic head device of a recorder.

2. Description of the Related Art Recently, a tape recorder capable of reciprocal recording and reproduction by rotating a magnetic head to switch the track position of a magnetic tape has been proposed. In particular, in a cassette type tape recorder, wow and flutter are improved by reducing the load of magnetic tape running. , And it is becoming the mainstream due to its focus on improving mechanical accuracy.

Conventionally, in a magnetic head device of a tape recorder of a type that rotates a head, a mechanism for applying a rotational force to the head and crimping a head rotating arm to an azimuth adjusting screw has a normal rotation,
A method of using a click spring for both inversion is known.

Problems to be Solved by the Invention However, in the above-mentioned conventional method, when the head is rotated,
In particular, when the deflection of the click spring is maximized, the load on the mechanism drive source (motor) becomes very large, which has been a problem of energy saving and high reliability of the mechanism.
Then, after the click spring crosses the neutral point, which is the maximum deflection, the very large impact force generated when the head rotating arm is crimped onto the azimuth adjustment screw loosens the azimuth adjustment screw, which causes azimuth deviation. It had a problem that

The present invention, with a simple structure, significantly reduces the rotational load of the head for switching the track position of the magnetic tape, and further eliminates the impact force on the azimuth adjusting screw when the head rotates,
Provided is a magnetic head device of a tape recorder capable of suppressing the azimuth shift due to head rotation to a minimum.

Means for Solving the Problems A magnetic head device of a tape recorder according to the present invention is a reciprocal recording / reproducing in which the track position of the magnetic tape is switched by the rotation of the magnetic head in accordance with the forward / reverse direction constant speed running state of the magnetic tape. In a possible tape recorder, a head substrate slidably provided on a mechanical substrate between a reproduction position and a stop position, and a magnetic tape is slid on the head substrate according to the forward and reverse constant speed running directions of the magnetic tape. A head switching rod that is movably provided, the magnetic head, and a head mount having a rotating arm, a rotating shaft, and a head reversing switching gear; and a rotating shaft of the head mount that is rotatably supported. A head base provided on a head substrate, and the rotation of the magnetic head mounted on the head base when the magnetic tape is running in a forward direction and a reverse speed. An azimuth adjusting screw for adjusting an angle, a head drive gear slidably provided on the head base, coupled with the head switching rod via an elastic body, and meshing with the head reversing gear, and the magnetic tape. So as to generate a pressure-bonding force in a direction in which the elastic body presses the rotary arm of the head mount against the azimuth adjusting screw in accordance with the movement of the head substrate to the reproduction position during the normal rotation and the reverse constant speed traveling. And a cam provided on the mechanical substrate for controlling the position of the head switching rod.

Action The present invention relates to pressing the azimuth adjusting screw of the head mount rotating arm of the rotary head, that is, rotational positioning and setting of the head azimuth in conjunction with the forward movement of the head substrate, and the cam provided on the mechanical substrate and the head switching rod. By adopting the method of using an elastic body provided between the head drive gear and the head drive gear, the rotational load of the head for switching the track position of the magnetic tape is significantly reduced, and azimuth adjustment during head rotation is also performed. By eliminating the impact force on the screws, the azimuth shift due to head rotation can be minimized.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 4 are a front view of the overall configuration showing an embodiment of the present invention, a top view of a head rotating portion, a top view of the overall configuration excluding the head rotating portion, and an exploded perspective view, respectively.

In FIGS. 1 to 4, 1a is a recording / reproducing magnetic head (hereinafter referred to as a recording / reproducing head), 1b is an erasing head, 2 is a head mount, and the recording / reproducing head 1a and the erasing head 1b are respectively located in the central portion. The core gap of the head is adjusted in position (angle) so that it is stored and fixed, and the rotation axis 2a is used as the center of rotation.
Also, a head reversing switching gear 2b is formed, and a rotary arm 2c is further formed on the outer peripheral surface. 3 is a head rotary bearing,
It is attached to a head base 4 fixed to a head substrate 5. The head substrate 5 is provided slidably in the arrow AB direction on the mechanical substrate 6 between the reproduction position and the stop position. Reference numeral 7 is a head drive gear (hereinafter referred to as a rack) that is guided by guide portions 4a and 4b of the head base 4 and slides on the head base in the direction of the arrow CD to rotate the head reversal switching gear 2b left and right, and 8 is a rack 7 And a head switching rod which is interlocked by a spring locking portion 8a via a head spring 9 attached to a spring hook 7a on the rack, and 10 is a spring which normally biases the head switching rod 8 in the direction of arrow D. Reference numeral 11 denotes a pin provided on the head switching rod 8, and the position of the pin 11 is controlled by the groove cam 12 (hatched portion in FIG. 3) of the mechanical substrate 6 when the head substrate advances (direction of arrow A).

In the stopped state, as shown in FIGS. 1 and 3, the head switching rod 8 is biased by the spring 10 in the direction of arrow D, and the pin 11 on the head switching rod has the cam 12 of the cam 12 on the mechanical substrate. It is locked at the surface 12a and is at the position 11a. At this time, the rotary arm 2c of the head mount 2 is located at a position 2a in the counterclockwise direction of the angle θ ₁ from the state 2c in which the rotary arm is lying sideways (a position where the forward rotation azimuth is adjusted). Here, the azimuth adjustment screw 13 is rotated by an angle θ ₂
Set it to the position where it abuts when rotated clockwise.

Next, in the normal rotation reproduction state in which the head substrate 5 moves in the direction of arrow A by the stroke S ₁ from the stopped state, the cam surface 12
b and the pin 11 at the 11b position come into contact with each other,
In the reverse reproduction state, a driving means such as a cam (not shown)
The pin 11 on the head switching rod 8 moved by the stroke S _{3 in the} arrow C direction from the stopped state is arranged along the cam surface 12c when the head substrate 5 is advanced in the arrow A direction.

Reference numerals 13 and 14 denote azimuth adjusting screws that are adjustably mounted on the head base 4, and the rotating arm 2c of the head mount contacts the azimuth adjusting screw to determine the rotational position of the head, that is, the head azimuth.

The operation of the present embodiment configured as described above will be described below.

First, the operation of shifting from the stopped state to the normal rotation reproduction state will be described. When the normal rotation reproduction operation is performed, the head substrate 5 moves in the arrow A direction by the stroke S ₁ from the stopped state shown in FIGS. 1 and 3, and the head switching rod 8 also moves in the A direction by the stroke S _{1 accordingly.} However, at this time, the pin 11 on the head switching rod 8 abuts on the cam surface 12b of the cam 12, so that the head switching rod 8 travels in the D direction so that the pin 11 moves from position 11a to position 11b. S ₂ Move.

The moving force of the head switching rod 8 moves the rack 7 via the head spring 9 and rotates the head reversing switching gear 2b, so that the rotation arm 2c of the head mount 2 contacts the azimuth adjusting screw 13 at an angle. Rotate (θ ₁ + θ ₂ ).

Here, tighten the azimuth adjustment screw 13 on the forward rotation side, and rotate the head mount rotation arm counterclockwise until the rotation arm reaches the 2 ha position.
_When it is rotated _twice , the rack 7 moves in the direction of the arrow C corresponding to the angle θ ₂ via the head reversing switching gear 2b.
Since the pin 11 of the head switching rod 8 is prevented from moving by the cam surface 12b, the head spring 9 bends. That is, variations in the azimuth adjustment range are absorbed by this head spring, and the rotating arm 2c of the head mount is pressed against the forward rotation side azimuth adjustment screw 13 by the spring pressure of the head spring generated at this time.

Next, the operation of shifting from the stopped state to the reverse reproduction state will be described. Here, the reverse side azimuth adjustment screw is
14 is set to a position where the rotary arm 2c comes into contact with the rotary arm 2c when rotated by an angle θ _{2 in the} counterclockwise direction from the position 2 (the position where the rotary arm is located right beside and the reverse azimuth is adjusted).

First, the head switching rod 8 is moved from the 11th position to the 11th position by the driving means (not shown) such as a cam by reversing reproduction operation.
Stroke S _{3 is} moved in the direction of arrow C against spring 10 until it reaches the double position. Along with this, the rack 7 slides in the direction of arrow C on the head base 4 via the head springs 9 while being guided by the guides 4a and 4b, and accordingly, the meshed head reversing switching gear 2b rotates counterclockwise to form one body. The head mount which is no longer inverts, and the rotary arm 2c is rotated to a position symmetrical to the stopped state, that is, a position 2d. Then head substrate 5
Moves stroke S _{1 in the} direction of arrow A. At that time, the pin
11 moves by stroke S _{1 in} the direction A and stroke S _{4 in the} direction C along the cam surface 12c due to the spring pressure of the spring 10, that is, the pin 11 moves from position 11d to position 11e. Further, at this time, the rotary arm 2c of the head mount 2 rotates by the angle (θ ₁ + θ ₂ ) at the stroke S ₄ and reaches the 2e position where it comes into contact with the azimuth screw 14 on the reverse side from the 2nd position.

Now tighten the azimuth adjusting screw 14 on the reverse side and rotate the head mount rotating arm clockwise to the angle θ until the 2nd arm is reached.
_When rotated _twice , the rack moves in the direction of the stroke arrow D equivalent to the angle θ ₂ via the head reversal switching gear 2b, but the head 11 is blocked by the cam surface 12c because the pin 11 of the head switching rod 8 is blocked. The spring 9 bends. That is, also in the case of reversing reproduction, the fluctuation of the azimuth adjustment range is absorbed by this head spring as in the case of normal rotation, and the spring pressure of the head spring generated at this time causes the rotating arm 2c of the head mount to rotate the azimuth adjusting screw on the reverse side. It is configured to be crimped to 14.

As described above, according to the present embodiment, the light spring that always biases the head toward the normal rotation side to overcome the rotational bearing loss in the stopped state of the load accompanying the rotation of the magnetic head from normal rotation to reverse rotation. Ten
Since only the load is applied, the load applied to the mechanism drive source (motor) can be significantly reduced, and the current consumption can be reduced and the head rotating operation can be speeded up.

Furthermore, the rotating arm 2c of the head mount during normal and reverse playback
The head 12 is pressed against the azimuth adjusting screws 13 and 14 by the pressure of the head spring 9 by using the cam 12 formed on the mechanical substrate 6 by the forward force from the stop of the head substrate 5 to the reproduction state. With the method of constructing, the azimuth adjustment screw can be prevented from being directly applied with an impact force and the occurrence of azimuth deviation can be prevented.

As described above, the magnetic head device of the tape recorder according to the present invention is capable of reciprocal recording / reproduction in which the track position of the magnetic tape is switched by the rotation of the magnetic head in accordance with the forward / reverse direction constant speed running state of the magnetic tape. In a tape recorder, a head substrate slidably provided between a reproducing position and a stopping position on a mechanical substrate, and sliding on the head substrate according to the forward and reverse constant speed running directions of the magnetic tape. A head switching rod provided freely, the magnetic head being housed, a head mount having a rotating arm, a rotating shaft, and a head reversing switching gear, and the rotating shaft of the head mount being rotatably supported. A head base provided on a substrate and a rotation angle of the magnetic head attached to the head base when the magnetic tape is running in a normal rotation and a reverse constant speed. Of the magnetic tape, an azimuth adjusting screw for adjusting the head drive gear, a head drive gear slidably provided on the head base, coupled to the head switching rod via an elastic body, and meshing with the head reversing gear. According to the movement of the head substrate to the reproduction position during the normal rotation and the reverse constant speed traveling, the elastic body generates a pressure-bonding force in a direction of pressing the rotating arm of the head mount against the azimuth adjusting screw. A cam provided on the mechanical substrate for controlling the position of the head switching rod is provided, and the pressing of the head mount rotating arm against the azimuth adjusting screw, that is, the rotational positioning and the setting of the head azimuth are linked with the forward movement of the head substrate. Since the cam is provided on the mechanical board, the head switching rod, and the elastic body provided between the head drive gear, the magnetic test is performed. An excellent tape that significantly reduces the rotational load of the head for switching the track position of the head, eliminates the impact force on the azimuth adjustment screw at the time of head rotation, and minimizes the azimuth deviation due to head rotation. The magnetic head device of the recorder can be realized.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of a magnetic head device of the present invention, FIG. 2 is a partial cross-sectional top view of a head rotating portion in FIG. 1, and FIG. 3 is a head from FIG. FIG. 4 is an exploded perspective view of FIG. 1 with a top view excluding the rotating part. 2 ... Head mount, 5 ... Head substrate, 6 ... Mechanical substrate, 7 ... Rack, 8 ... Head switching rod, 9 ...
Head spring, 12 …… Cam (on mechanical board), 13,14 …… Azimuth adjustment screw.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Sakai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Tadashi Kuroda 1006 Kadoma, Kadoma City Osaka Prefecture

Claims (1)

[Claims] 1. A tape recorder capable of reciprocal recording and reproduction in which a track position of the magnetic tape is switched by rotating a magnetic head in accordance with a constant speed traveling direction of the magnetic tape in a normal direction and a reverse direction. A head substrate slidably provided between the positions; a head switching rod slidably provided on the head substrate according to the forward and reverse constant speed running directions of the magnetic tape; A head mount that houses a head and has a rotating arm, a rotating shaft, and a head reversing switching gear, and rotatably supports the rotating shaft of the head mount,
A head base provided on the head substrate; an azimuth adjusting screw that is attached to the head base and adjusts a rotation angle of the magnetic head during forward and reverse constant speed running of the magnetic tape; A head drive gear that is movably provided and is coupled to the head switching rod through an elastic body and that meshes with the head reversing gear; and a head substrate when the magnetic tape is running in forward and reverse constant speeds. On the mechanical board for controlling the position of the head switching rod so that the elastic body generates a pressure-bonding force in a direction of pressing the rotating arm of the head mount against the azimuth adjusting screw in accordance with the movement to the reproduction position. A magnetic head device for a tape recorder, characterized by comprising a cam provided in the.