JPH0528443A - Head adjusting device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the workability of magnetic head height adjustment and to stabilize head tilt adjustment and azimuth adjustment. [Structure] A holding plate 11 that moves up and down with respect to a base 12, a main shaft 13 that is inserted through the holding plate 11, a sub-shaft 14 that is installed in parallel with the main shaft 13, and a sub-shaft 14 and the main shaft 13. A magnetic head 17 provided between the magnetic heads 17 and elastically held by the holding plate 11, and a first screw 19 and a second screw 20 for adjusting the magnetic head 17 in the tilt and azimuth directions are attached to the holding plate 1.
The second spring 2 has a third screw 21 for adjusting the head height direction, which is screwed into the locking recess 14a and the tip of which faces the locking recess 14a, and has a biasing force in the axial direction of the third screw 21.
2 was mounted between the holding plate 11 and the flange 13a. Therefore, the holding plate 11 in which a moment is generated by the second spring 22 can be held by the main shaft 13 and the sub shaft 14, and the holding screw 11 can be moved up and down by the third screw 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head adjusting device suitable for use in, for example, a video tape recorder (hereinafter referred to as "VTR").

[0002]

2. Description of the Related Art Generally, a magnetic head for fixing such as an audio head in a VTR requires height adjustment in addition to tilt adjustment and azimuth adjustment for a magnetic tape.

Therefore, conventionally, the height of the magnetic head is adjusted by vertically adjusting the head mounting plate, and the magnetic head is adjusted by swinging the head mounting plate in the tilting and azimuth directions. A head adjustment device that has the functions of tilt adjustment and azimuth adjustment is used.

This is provided with a fixing plate that elastically holds the head mounting plate, and three screws that are screwed to the fixing plate so as to move back and forth to adjust the head mounting plate.

Further, as a conventional head adjusting device, one having a screw for independently adjusting the height of the magnetic head is adopted, and for example, it is constructed as shown in FIGS. 3 (A) and 3 (B). Has been done.

This is a holding plate 4 which is provided above the base 1 so as to be movable up and down and has a plurality of screws 3 for adjusting the magnetic head 2 in the tilting direction and the azimuth direction; 1, a main shaft 6 having a nut 5 for adjusting the head height direction at the upper insertion end of the upper and lower insertion ends, and a holding plate 4 loaded on the main shaft 6 for biasing the holding plate 4 toward the nut 5 and in the surface direction. And a spring 7 for restricting rotation. Reference numeral 8 in the figure denotes a head mounting plate elastically held by the holding plate 4 by a spring 9.
Reference numeral 10 is a shaft body that locks one end of the spring 7.

[0007]

However, in the former case, since the three screws are in contact with the head mounting plate, when adjusting the height of the magnetic head, the screw for adjusting the tilt and the head for adjusting the height of the magnetic head are used. It was necessary to adjust all three adjusting screws, including the azimuth adjusting screw. As a result, there is a problem in that the number of operations is increased when adjusting the height of the magnetic head, and the workability of adjusting the height of the magnetic head is reduced.

On the other hand, in the latter, since the holding plate 4 is elastically held on the main shaft 6 by the spring 7,
There is a problem in that the holding plate 4 rattles when adjusting the tilt / azimuth of the magnetic head 2 and stable tilt / azimuth adjustment of the magnetic head 2 cannot be performed.

The present invention has been made in view of the above circumstances, and it is possible to improve the workability of adjusting the height of the magnetic head and to perform a stable tilt / azimuth adjustment of the magnetic head. Is provided.

[0010]

A head adjusting device according to the present invention is provided with a holding plate which is provided above a reference surface so as to be able to move up and down and has a through hole which opens in the vertical direction, and which is inserted into the through hole of the holding plate. And a main shaft that is erected on the reference surface and has a spring receiver at the upper insertion end, and a sub-shaft that is installed in parallel with the main shaft at a predetermined interval and that is erected on the reference surface and that has a locking recess that opens upward. A magnetic head provided between the sub shaft and the main shaft and elastically held by the holding plate is provided, and a screw for adjusting the magnetic head in the tilting direction and the azimuth direction is screwed to the holding plate so as to be movable back and forth, and A screw for adjusting the head height direction with the tip facing the inside of the stop recess is screwed so that it can move back and forth, and a spring having an urging force in the axial direction of this screw is mounted between the holding plate and the spring receiver. is there.

[0011]

In the present invention, the spring can generate a moment on the holding plate to hold the holding plate with respect to the main shaft and the auxiliary shaft.

Also, in the present invention, the holding plate can be moved up and down by the screw for adjusting the head height direction.

[0013]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIGS. 1A and 1B are a plan view and a sectional view showing a head adjusting device according to the present invention.

In the figure, reference numeral 11 designates a first through hole 11a which is opened in the vertical direction and the first through hole 11
A holding plate having a substantially triangular shape in a plan view having a cylindrical portion 11b extending in the lower opening direction of a is provided above the base 12 as a reference surface so as to be able to move up and down. Also, this holding plate 11
Is provided with a second through hole 11c different from the first through hole 11a and a screw hole 11d that opens in the same direction as the opening direction of the second through hole 11c.

Reference numeral 13 is a flange 1 as a spring receiver.
A spindle having an upper end 3a is inserted into the first through hole 11a and the cylindrical portion 11b of the holding plate 11 and is erected on the base 12.

Reference numeral 14 denotes a sub shaft having a locking recess 14a which opens upward, and is arranged in parallel with the main shaft 13 at a predetermined interval and stands on the base 12. This counter shaft 14
The height position of the upper end surface of is set lower than the height position of the upper end surface of the main shaft 13.

Reference numeral 15 denotes a head mounting plate having a substantially triangular shape in plan view, which is provided below the holding plate 11 so as to be adjustable. The holding plate 11 is provided on the upper surface of the head mounting plate 15.
A holding rod 16 having a flange 16a as a spring receiver is provided, and a magnetic head 17 such as an audio head is fixed to the lower surface of the holding rod 16.

Reference numeral 18 denotes a first spring having a vertical urging force, which is elastically mounted between the flange 16a of the holding rod 16 and the one-side opening peripheral edge of the second through hole 11c, and the holding plate 11 is provided. In addition, the magnetic head 17 is elastically held via the head mounting plate 15.

Reference numeral 19 is a first screw for adjusting the magnetic head 17 in a tilting direction, and is screwed up and down with the tip of the holding plate 11 brought into contact with the upper surface of the head mounting plate 15.

Reference numeral 20 denotes a second screw for adjusting the magnetic head 17 in the azimuth direction, which is arranged in parallel with the first screw 19 at a predetermined interval, and the tip of the holding plate 11 is the upper surface of the head mounting plate 15. It is screwed up and down so as to be brought into contact with.

Reference numeral 21 is a third screw having a conical tip portion 21a facing the locking recess 14a, which is screwed up and down in the screw hole 11d so that the magnetic head 17 can be adjusted in the height direction. Is configured.

Reference numeral 22 is a second spring having an urging force in the axial direction of the third screw 21, which is mounted between the opening peripheral edge of the first through hole 11a and the end surface of the flange 13a.

The symbol M in the figure indicates the direction of action of the moment generated in the holding plate 11 by the second spring 22.

In the head adjusting device constructed as described above, a moment is generated in the holding plate 11 by the second spring 22 in the direction indicated by the arrow M, and the holding plate 11 is moved.
Can be held with respect to the main shaft 13 and the sub shaft 14.

Therefore, in this embodiment, it is possible to prevent the holding plate 11 from rattling when adjusting the tilt and azimuth of the magnetic head 17.

Further, in this embodiment, the holding plate 11 can be held by the main shaft 13 and the auxiliary shaft 14 so that the magnetic head 17 does not operate even if an impact force is applied to the holding plate 11 from above.

Further, in this embodiment, the third screw 2
Since the raising and lowering operation can be imparted to the holding plate 11 by 1, the height adjustment of the magnetic head 17 can be performed independently of the tilt adjustment and the azimuth adjustment.

In the present embodiment, an example in which it is applied to a VTR is shown, but the present invention is not limited to this and can be applied to other audio equipments as in the embodiment.

Further, the shapes and arrangements of the constituent parts in the present invention are not limited to the above-mentioned embodiment, and it goes without saying that various embodiments can be adopted as shown in FIG. Here, in the figure, reference numeral 31 is a holding plate, 31a is a cylindrical portion, 32 is a main shaft, 32a is a flange, 33 is a sub shaft, and 34 is a sub shaft.
Is a magnetic head, 35 is a screw for adjusting the head tilt direction,
36 is a screw for adjusting the head azimuth direction, 37 is a screw for adjusting the head height direction, 38 is a first spring, 39 is a second spring, and 40 is a base.

[0031]

As described above, according to the present invention, a holding plate which is provided above the reference surface so as to be lifted and has a through hole that opens vertically, and a reference plate which is inserted into the through hole of the holding plate and which serves as a reference. Main shaft having a spring bearing at the upper insertion end, which is erected on the surface, a counter shaft provided in parallel with the main shaft at a predetermined interval and standing on a reference surface and having a locking recess opening upward, and the counter shaft. A magnetic head provided between the main shaft and the main shaft and elastically held by the holding plate, and a screw for adjusting the magnetic head in the tilting direction and the azimuth direction is screwed to the holding plate so as to be able to move forward and backward, and the locking recess is provided. A screw for adjusting the head height direction with the tip facing inside is screwed forward and backward, and a spring having a biasing force in the axial direction of this screw is mounted between the holding plate and the spring receiver. Momen on holding plate Is generated, it is possible to hold the holding plate relative to the major and minor axes.

Therefore, it is possible to prevent rattling of the holding plate when adjusting the tilt and azimuth of the magnetic head, so that the tilt and azimuth of the magnetic head can be adjusted stably.

Since the lifting plate can be moved up and down by the head height adjusting screw, the height of the magnetic head can be adjusted independently of the tilt adjustment and the azimuth adjustment. The workability of adjusting the head height can also be improved.

Further, since the holding plate can be held with respect to the main shaft and the sub shaft, the magnetic head does not operate even if an impact force acts on the holding plate from above, and tilting and azimuth adjustment of the magnetic head can be easily performed. There are also advantages.

[Brief description of drawings]

1A and 1B are a plan view and a cross-sectional view showing a head adjusting device according to the present invention.

FIG. 2 is a perspective view showing another embodiment.

3A and 3B are a plan view and a cross-sectional view showing a conventional head adjusting device.

[Explanation of Codes] 11 ... Holding plate, 11a ... First through hole, 12 ... Base, 13 ...
Main shaft, 13a ... Flange, 14 ... Secondary shaft, 14a ... Locking recess, 17 ... Magnetic head, 19 ... First screw, 20 ... Second screw, 21 ... Third screw, 22 ... Second spring.

Claims (1)

Claim: What is claimed is: 1. A holding plate which is provided above a reference surface so as to be able to move up and down and has a through hole that opens in the vertical direction; and a holding plate which is inserted into the through hole of the holding plate and stands on the reference surface. A main shaft having a spring receiver at the upper insertion end of the upper and lower insertion ends, and a sub-shaft having a locking recess that is provided in parallel with the main shaft at a predetermined interval and is erected on the reference surface and that opens upward. A magnetic head is provided between the auxiliary shaft and the main shaft and elastically held by the holding plate, and screws for adjusting the magnetic head in the tilting direction and the azimuth direction are respectively screwed to the holding plate so as to move back and forth. A screw for adjusting the height of the head, the tip of which faces the locking recess, is screwed so as to move forward and backward, and a spring having a biasing force in the axial direction of the screw is attached to the holding plate and the spring receiver. Between the two Head adjustment apparatus according to claim.