JPH075536Y2 - Magnetic head position adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic head position adjusting mechanism, and more particularly to a magnetic head provided corresponding to a magnetic tape used in a video tape recorder or the like at a predetermined position. Regarding the mechanism for adjusting to.

<Outline of the Invention> The present invention is a so-called X
Regarding position adjustment, an arm member that supports a magnetic head and is urged from one direction about a support shaft as a rotation center and a leaf spring member are pressed against each other in the opposite direction to deform the leaf spring member. The position of the posture in the rotational direction about the spindle of the magnetic head is adjusted by the arm member.

<Conventional technology> Conventionally, a video tape recorder (hereinafter referred to as VTR)
In adjusting the position of the magnetic head mounted on the magnetic tape, etc., it is necessary to make various adjustments to the conveyed magnetic tape in order to set the optimum height position and optimum angle. .

First, adjustment of the height position from the installation surface of the magnetic head; second, so-called azimuth adjustment; adjustment of the tilt angle of the magnetic head with respect to the traveling direction of the magnetic tape; third, so-called tilt angle adjustment. Is called,
Adjustment of the tilt angle of the magnetic head facing the magnetic tape to the front and back, and fourth, so-called X position adjustment, which is the position of forward or backward displacement of the gap of the magnetic head with respect to the traveling direction of the magnetic tape. Adjustment, etc.

Next, a typical example of the height position and mounting angle adjusting mechanism of such a magnetic head is shown in FIGS. In FIG. 7, a magnetic head 3 is mounted on a base 2 which is placed on the upper surface 1a of the arm 1 at a constant interval 14 and has a substantially rhombic shape in plan view. The arm 1 vertically includes a hollow cylindrical portion 1c at one end thereof, and the cylindrical portion 1c is, for example, on a shaft 4 vertically provided on a predetermined installation surface E inside a VTR (not shown). It is attached by being pivotally supported. In addition, one end of the lower portion 4a of the shaft 4 is fixed to the installation surface E and the other end is engaged with 1b of the arm 1 to urge the arm 1 upward (direction of arrow A in FIG. 7) and A coil spring 7 is mounted which is urged to swing in the direction of arrow D'in the fifth illustration in plan view, while the upper part 4b is arm urged upward by the coil spring 7. Stop nut 5 for adjusting the height position of 1
Is screwed on.

Next, in the vicinity of the swing side of the arm 1 in the direction of the arrow D ′ shown in FIG. 5, a taper nut 11 that abuts the side end surface 1d of the arm 1 and blocks the rotating arm 1 at that position is provided. It is provided. The taper nut 11 is provided with an inclination on its rotation peripheral surface and is formed so as to be gradually reduced in diameter downward, and is rotated on a shaft 13 provided perpendicularly to the installation surface E similarly to the shaft 4. It is screwed as possible.

On the other hand, the base 2 has, for example, as shown in FIG. 5, the arm 1 protrusion 12, the screw 6, and the arm 1, which are distributed to the corners 2a, 2b, 2c and 2d.
It is mounted on the arm 1 via pins 8 and screws 10 (see FIGS. 6 and 7). Of these, the arm protrusion 12 is arranged at the corresponding corner portion 2a which is the front portion of the magnetic head 3 as described above, and the base 2 is slightly free from the arm 1 via the arm protrusion 12. It is laid so that it can hold the degree.

Next, a screw 6 provided at a position facing the arm protrusion 12
Contacts the upper surface 1a of the arm 1 at its lower end, and the pin 8
At the lower end thereof, only the arm 1 is screwed, and the shaft portion of the pin 8 is equipped with, for example, a coil spring 9 for pushing down the base 2 to the arm 1 side. And
A screw 10 provided at a position facing the pin 8 penetrates the base 2 and is screwed only to the arm 1 at the lower end.

Therefore, in the case of the conventional magnetic head position adjusting mechanism having such a structure, for example, when the height position of the magnetic head 3 is to be adjusted, the stop nut 5 screwed onto the shaft 4 is loosened or This is done by tightening or moving the arm 1 up and down (in the direction of arrow AA 'in FIG. 7). Further, when the azimuth adjustment is to be performed, the screw 10 is loosened or tightened, and the base 2 is operated in cooperation with the pin 8 provided at the position opposite to the screw 10 as indicated by the arrow BB 'in FIG. This is done by rocking in the direction. Next, when the tilt angle is to be adjusted, the screw 6 is loosened or activated, and the protrusion 12
With the center of rotation as the center of rotation, the base 2 is swung in the direction of the arrow CC 'shown in FIG.

When adjusting the X position, the taper nut 11 is loosened or tightened. As a result, the radius of the taper nut 11 that makes the rotating peripheral surface contact the end surface 1d of the arm 1 changes, and the arm 1 rotates about the shaft 4 in the direction of arrow D-D 'shown in FIG. . Here, the distance from the opening drum (not shown) located in front of the magnetic head 3 to the point H (see FIG. 5) of the magnetic head 3 is adjusted.

<Problems to be Solved by the Invention> However, in the case of the conventional magnetic head position adjusting mechanism, when the height position of the magnetic head is adjusted after the X position of the magnetic head is adjusted, the height of the arm 1 is increased. The taper nut 11 rotates around the end face of the arm 1
Since the radius of the portion in contact with 1d also changes relatively, the X position of the magnetic head 3 must be adjusted again. Further, when an external force is applied to the magnetic head 3 or the arm 1 for some reason, and the arm 1 rotates in the direction of arrow C shown in FIG.
The taper nut 11 receives the biasing force of the coil spring 7
Because of the movement in the diameter reducing direction, it rotates in the direction of arrow D'in the fifth illustration. In this case, in order to return the magnetic head 3 to the original position, the magnetic head 3 must be returned via the operation of the taper nut 11, which is a very difficult work.

Therefore, a main object of the present invention is to provide a magnetic head position adjusting mechanism capable of easily and accurately adjusting the position of the magnetic head.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the main means adopted by the present invention is to support a magnetic head and to swing the first supporting shaft set on the installation surface as a rotation center. An arm member, and a leaf spring member near the swing side of the arm member, which is set and bent at a suitable distance from the first support shaft,
A member for deforming the leaf spring member that is rotatably provided around the second support shaft and a member for attaching to the arm member side, and an end face of the arm member being in pressure contact with the leaf spring member. It is the point that it is equipped with a means.

<Operation> When the screw member (member for deforming the leaf spring member) is rotated about the second support shaft, the leaf spring member is deformed accordingly, and the arm member is deformed by the deformation of the leaf spring member. It swings around the first spindle. On the other hand, for example, if the height position of the magnetic head is adjusted and then the height position of the arm 1 is adjusted by loosening or tightening the lock nut 5, the pushing amount to the arm member is increased by the leaf spring member. It has no effect on the movement in the height direction,
The magnetic head 2 does not swing.

The swinging of the arm member for adjusting the position of the magnetic head X and the vertical movement of the arm member 1 for adjusting the height position of the magnetic head are performed by separate operations. Since the movement of one side is not restricted or influenced by the movement of the other side, the height position of the magnetic head and the X position can be adjusted easily and reliably. Further, even if the arm member moves in the height direction or the rotation direction and is displaced due to an external force, the pushing amount of the leaf spring member to the arm member in the height direction or the rotation direction of the arm member Since it does not depend on the movement, the arm member can be easily returned to the initial state.

Embodiments The above-mentioned objects, other objects, features and advantages of the present invention will be more apparent from the detailed description of the following embodiments with reference to the drawings.

1 is a schematic plan view of a magnetic head position adjusting mechanism according to an embodiment of the present invention, FIG. 2 is a front view of the embodiment mechanism in FIG. 1, and FIG. 3 is a side view of the embodiment mechanism in FIG. FIGS. 4A and 4B show schematic assembly diagrams of the leaf spring member and the leaf spring deforming screw member shown in FIGS.

In the following embodiments, the same reference numerals are used for the elements common to the conventional magnetic head position adjusting mechanism shown in FIGS. Further, in the case of the following example mechanism, the height position adjusting mechanism, the azimuth adjusting mechanism, the chew angle adjusting mechanism and the like for adjusting the height position and angle of the magnetic head have already been described with reference to FIGS. Since the same mechanism as that of the conventional magnetic head position adjusting mechanism is used, the description thereof will be omitted.

In FIG. 3, the magnetic head position adjusting mechanism 20 swings in the direction of arrow D-D 'shown in FIG. 1 about the shaft 4 provided on the installation surface E as the center of rotation, similarly to the conventional one described above. It comprises a movably mounted arm 1.
Also in this embodiment, the arm 1 has the shaft 4
The coil spring 7 mounted on the lower portion 4a of the above-mentioned structure receives an upward biasing force, and is also biased to rotate in the direction of arrow D'shown in the first illustration.

In this case, in the vicinity of the swing side of the arm 1 in the direction of the arrow D'in the first illustration, a leaf spring member 22 that abuts the side end surface 1c of the arm 1 and blocks the rotating arm 1 at that position 22. Are provided (see FIGS. 1 and 2).

As can be seen from FIG. 2, the leaf spring member 22 is set to have a parallelogram-like shape together with the installation surface E when viewed from the side in the state where it is incorporated in the adjusting mechanism.

Further, the leaf spring member 22 is fixed by a screw shaft 31 penetrating through the leaf spring member and built vertically from the installation surface E, and a nut member 30 screwed to the shaft 31.

Furthermore, the side end surface 1e of the arm 1 that contacts the leaf spring member 22
Is set to be perpendicular to the installation surface E as shown in FIG. 2, and is also set to have an arcuate plan view shape as shown in FIG.

As shown in FIGS. 4 (a), (b), (c), and (d), when the leaf spring material 22 is installed on the installation surface E, it is fitted into the protrusion 33 and the hole 32 provided on the installation surface E. As a result, the rotation and movement of these projection holes are prevented.

According to the above configuration, the magnetic head can be smoothly moved in the D'-D direction by rotating the nut member 30 screwed on the upper portion of the leaf spring member 22. For example, when the nut member 30 is rotated clockwise, the nut member 30 moves downward in FIG. 2 and the leaf spring member 22 is pressed. At that time, the leaf spring member portion 22a that abuts on the arm 1 moves in the G direction, and at the same time, moves the arm 1 in the same direction to rotate the magnetic head 3 on the base 2 on the base 1 in the D direction. To do. Conversely, when the nut member 30 is rotated counterclockwise, the nut member 30 moves in the F'direction, the leaf spring member 22 extends in the G direction, and the magnetic head 3 rotates in the D'direction.

Since the shape of the leaf spring member 22 and the installation surface E is parallelogram-like, there is no gap between the nut members 30 even when the leaf spring member 22 is deformed. Further, since the side end surface 1e of the arm 1 (the contact portion with the leaf spring member 22) has an arc-shaped plan view shape, the leaf spring member 22 and the arm 1 can be brought into contact with each other without biasing against each other. Furthermore, the side end face
When the nut 5 is rotated to change the height of the magnetic head 3 by setting 1e perpendicular to the installation surface E, even if the arm member 1 is moved in the vertical direction, the X position is not changed. .

<Advantages of the Invention> Since the magnetic head position adjusting mechanism of the present invention has the above-described configuration, it is possible to perform the swinging of the arm member for adjusting the X position of the magnetic head and the adjustment of the height position of the magnetic head. The vertical movement of the arm member for this purpose is performed by separate scanning, so that the movement of one is not restricted or influenced by the movement of the other, and the height position of the magnetic head is adjusted. And the adjustment of the X position can be performed easily and surely.

Further, even if the arm member moves in the height direction or the rotation direction and is displaced due to an external force, the pushing amount of the leaf spring member to the arm member is in the height direction or the rotation direction of the arm member. Since it does not depend on the movement, the arm member can be easily returned to the initial state.

Furthermore, since the leaf spring member is set to have a parallelogram shape with the installation surface, the X position of the magnetic head can be adjusted smoothly.

[Brief description of drawings]

1 is a schematic plan view of a magnetic head position adjusting mechanism according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. 4 (a). Is a schematic view of the main assembly of the magnetic head position adjusting mechanism including a leaf spring member and a leaf spring deforming screw member, and FIG. 4 (b) is a plan view of the leaf spring member of FIG. 4 (a). 4 (c) is a left side view of the leaf spring member of FIG. 4 (a), FIG. 4 (d) is a right side view of the leaf spring member of FIG. 4 (a), and FIG. 4 (e) is FIG. 4 (a) is a plan view of the installation surface, FIG. 5 is a schematic plan view of a magnetic head position adjusting mechanism according to a conventional example, FIG. 6 is a front view of FIG. 5, and FIG. It is a side view of FIG. In the drawings, 1 is an arm, 2 is a base, 3 is a magnetic head, 4 is a shaft, 5 is a stop nut, 6 is a screw, 7 is a coil spring, 8 is a pin, 9 is a coil spring, 10 is a screw, and 11 is a taper nut. , 12 is an arm protrusion, 13 is a shaft, 14 is an interval,
22 is a leaf spring member, 30 is a nut member, 31 is a shaft, 32 is a hole, and 33 is a protrusion.

Claims (1)

[Scope of utility model registration request] 1. An arm member which supports a magnetic head and is swingable around a first support shaft set on an installation surface as a center of rotation; A leaf spring member that is bent in a substantially U-shape and is configured to have a parallelogram shape with the installation surface at a position that is appropriately separated from the support shaft, and is rotatably provided about the second support shaft as a rotation center. And a rotating member for pressing and deforming the leaf spring member to make it deform, and an urging means attached to the arm member side for keeping the side end surface of the arm member in pressure contact with the leaf spring member. A magnetic head position adjusting mechanism characterized by the above.