JPH03189916A - Magnetic head device - Google Patents

Abstract

PURPOSE:To independently execute the adjustment of respective directions and to restrain an effect on the other adjustment by providing a height adjustment means to one supporting shaft, simultaneously fixing a main body base which can be moved up and down on one supporting shaft and adjusting a magnetic head which makes a magnetic tape abut on the main body base in a three-dimentional direction. CONSTITUTION:A pair of supporting shafts 16 and 17 which are erected on a chassis 1 and the main body base 19 which is energized in an upper direction to one supporting shaft 16 by an energizing spring 18 can be moved in a vertical direction by the rotation of a nut 20. Besides, the height direction of the base 19 is fixed to the other shaft 17 by a spring 22. Therefore, even when one of the shafts 16 and 17 is inclined, the magnetic tape 14 is stretched by the other and the inclination of the magnetic head 10 in a longitudinal direction and the change thereof in a width direction with respect to the tape 14 are restrained. Besides, the height direction thereof can be also surely fixed. Thus, the adjustment of the respective directions is optionally and independently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixed magnetic head device for recording and reproducing audio and control signals for a VTR or the like.

BACKGROUND OF THE INVENTION Fixed magnetic heads in conventional magnetic recording and reproducing apparatuses are required to have high performance and reliability not only for recording and reproducing audio, but also for controlling video in VTRs. Therefore, highly accurate adjustment is required during assembly into the device.

FIGS. 2(a) and 2(b) show the configuration of a magnetic head device commonly used at present, particularly one used in a broadcast station VTR that requires high performance.

As shown in the figure, two support shafts 2 stand up on the chassis 1,
At one end of 2', a fixed plate 6 having a toothed part 611 is attached with a screw 7.7', sandwiching the base plate 4 having a long groove part 3 therebetween. The substrate 4 has set screws s and 1 screwed together, and uses the set screws s and 1 as a fulcrum to integrally hold the mount base 11 to which the magnetic head 1o is fixed by screws 9 and 9'.

Further, the screw 12 is connected to a notch 13 interposed between the screw 12 and the board 4.
By screwing into the mount base 11, the mount base 11 is attached to the setscrew 8. It always serves to apply a biasing force in the counterclockwise direction in the figure, with the tip of d as the fulcrum.

Here, the adjustment direction of the magnetic head 10 will be explained.

Generally, there are four adjustment directions; the first is azimuth adjustment, which allows the magnetic tape 14 to be tilted with respect to the longitudinal direction; this adjustment is performed by tightening or loosening the screws 9 and 9'. 2
The third adjustment is the tilt adjustment, which is the inclination of the magnetic head 1o in the vertical contact direction with respect to the magnetic tape 14. This adjustment is performed using the setscrews 8, 8'. The third is magnetic tape 14
Height adjustment to change the position in the width direction, this is a 99g screw
', set screw 8. Optimum adjustment is achieved by fine-tuning all of d.

The fourth method is to run parallel to the longitudinal direction of the magnetic tape 14. In this case, after slightly loosening screws 7 and 7',
This is done by inserting a gear driver or the like into the hole 16 of the board 4 and changing the relative position of the fixed plate 6 and the board 4 using the gear cutter 6.

Problems to be Solved by the Invention In such a conventional configuration, when adjusting the height, the screw 9
, 9', set screw 8. Since all of the adjustments of d are required, the azimuth adjustment and tilt adjustment that each of them is responsible for will also change, making the adjustment routine, leading to problems such as an increase in work man-hours and an increase in maintenance costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head device in which each adjustment can be performed independently and the influence on other adjustments can be suppressed.

Means for Solving the Problems In order to achieve the above object, the present invention provides a height adjustment means for at least one of a pair of support shafts erected on the chassis, and also provides height adjustment means for the pair of support shafts. means for fixing a downwardly movable main body base with at least one support shaft, and means for adjusting in three dimensions a magnetic head, on which a magnetic tape contacts the main body base, is provided on the main body base. It is something.

Function: According to the present invention, the relative position of the magnetic head with respect to the magnetic tape can be adjusted independently by the above-described configuration.

EXAMPLE Below, an example of the present invention is shown in FIGS. 1(a) and (b).
).

S...

As shown in the figure, a pair of support shafts 16 and 17 are erected on the chassis 1, a main body base 19 is urged upwardly by a biasing spring 18 on one of the support shafts 16, and the main body base 19 is It can be moved up and down by rotating the Nara 20.

The elongated hole 21 of the main body base 19 fits into the other support shaft 17, and the screw 2 provided on the main body base 19 fits into the main body base 19.
2 allows for fixation in the height direction.

A moving plate 24 having a long hole 23 is fixed to the main body base 19 with screws 26 .

In addition, the moving plate 24 is supported by the tips of both a caulking pin 26 fixed by means such as caulking and a screw screw 27 screwed together, and a mount base 2 of the magnetic head 1 degree.
The magnetic head 1o is integrally held by the screws 29 and 30 screwed into the magnetic head 8.

The screw 3o includes a spring 31 that biases the mount base 28 in one direction, and a slit 32 that securely holds the mount base 28 on the movable plate 24 with the screw 29°30 using the caulking pin 26 and the tilting screw 27 as fulcrums. is inserted.

One end of the biasing spring 18 is hung on the protrusion 33 of the main body base 19, and the other end is hung on a part of the chassis 1.

Therefore, the main body base 19 is supported by the support shaft 1 by the biasing spring 18.
The main body base 19 is configured so that the position of the main body base 19 does not change even when the main body base 19 is biased counterclockwise around the main body base 19 even when the screw 22 is tightened.

34 and 35 are flat washers to ensure a flat state.

Next, each adjustment method will be described.

First, the height is adjusted by loosening the screw 22 and turning the nut 2Q to move it up and down. After completing the adjustment, tighten the screw 22.

With this configuration, for example, even if one of the support shafts of the chassis 1 is tilted due to a temperature change, etc., it will be pulled by the other shaft, and the tilt of the magnetic head 1o with respect to the magnetic tape 14 in the longitudinal direction and change in the width direction will be prevented. You will be held down. It also allows for reliable fixation in the height direction.

7-7 Next, the azimuth adjustment is performed by rotating the screws 29 and 30 to rotate the mount base 28 about the caulking pin 26 and the tilting pin 27 as fulcrums.

The tilt adjustment is performed by turning the tilt screw 27 on a line connecting two points of the screw 29 and the crimping pin 26.

In addition, regarding the longitudinal direction of the magnetic tape 14, the screw 26
Slightly loosen the hole 36 on the main body base 19 and move plate 2.
By inserting an eccentric driver into the long hole 37 of No. 4 and turning it, it can be moved within the range of the long hole 23.

Effects of the Invention As described above, according to the magnetic head device of the present invention, adjustment in each direction can be performed arbitrarily and independently, which reduces work man-hours, reduces maintenance costs, and improves reliability. The practical effects are great.

4. rt'+,+Simple explanation of the drawings FIGS. 1(a) and 1(b) are a plan view and a front view showing a magnetic head device according to an embodiment of the present invention, and FIG. 2(a) and FIG. ]) are a plan view and a front view of a conventional magnetic head device.

18...Biasing spring, 19...Body base, 24...Moving plate.

Claims (1)

[Claims] A height adjusting means is provided on at least one of a pair of support shafts that stand up on the chassis, and means for fixing a main body base that is movable up and down with respect to the pair of support shafts on at least one of the support shafts, A magnetic head device characterized in that means is provided on the main body base for adjusting in a three-dimensional direction a magnetic head against which a magnetic tape comes into contact with the main body base.