JPS6079513A - Magnetic head adjusting mechanism - Google Patents

Abstract

PURPOSE:To shorten a distance between a chassis and a cassette, and to make a VTR set thin by forming a running direction and position adjusting member by a gear-shaped uneven part formed on the other end of a head base, and a worm gear whose axis is installed in parallel to the chassis. CONSTITUTION:A head plate 14 holds an audio erasing head 6 and an audio control head 7, is supported by an azimuth adjusting screw 10, a gate adjusting screw 11, a screw 12, a looseness adjusting spring 13, a center receiving projecting part 15a of a head base 15, etc., and also can execute an azimuth adjustment and a gate adjustment. Plural uneven parts 15c consisting of a tooth shape roughly are provided on the end face of the other side opposed roughly to one side being a position where a sleeve 15b of the head base 15 is caulked, and gear-coupled with a worm gear 22 supported so as to be freely turnable by overhang bent parts 16b, 16c of a chassis 16. Also, a fitting part 22a to a tool of a hexagonal shape, etc. is provided as one body with the worm gear 22 on the same axis of the worm gear 22, and formed so that a fine adjustment can also be executed by a tool such as a wrench.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a magnetic head adjustment mechanism for a video tape recorder (VTR).

[Background of the invention]

FIG. 1 shows a plan view of a conventional magnetic recording/reproducing device. In the figure, the magnetic tape 2 stored in the cassette 1 is
After being pulled out from the cassette 1, the tape is passed through a tape guide pin 3, an erasing head 4, etc., and then wound around a rotating cylinder 5 having a rotating video head at a predetermined angle. It is further configured to reach the cassette 1 via an audio erasing head 6, an audio control head 7, a tape guide bin 8, a keyboard 9, etc.

As one of the adjustment mechanisms of conventional magnetic heads,
- Is it something like what is described in No. 120563?
This structure will be explained with reference to FIG. 2, which is a 1,000-fold diagram, FIG. 3, which is a right side view partially shown in cross section, and FIG. 4, which is a front view, and the disadvantages of making it thinner will be described. The second to fourth causes are the audio and control signal heads of the cassette type helical scan VTR;
This figure shows a support adjustment mechanism for a head called an ACE head, which is integrated with a head for erasing audio tracks. In addition, it has an extremely simple structure that allows the head azimuth, tilt, height, and position in the magnetic tape running direction to be adjusted as independently as possible, and is the best at the moment. , is gradually becoming popular.

Its structure is shown in FIGS. 2 to 4, in which an audio control head 7 and an audio erasing pad 6 for erasing an audio track signal are held so as to obtain a required contact angle with the magnetic tape 2. The head base 15 has an azimuth adjustment screw 101 for adjusting the tilt and azimuth of these heads, a tilt U4 adjusting screw 11, a screw 12, a looseness spring 13, a head plate 14, and a sleeve 15b configured on the head plate 14. is pivotally supported on a support @17 on the chassis 16. A torsion spring 18 is held between the chassis 16 and the head base 15 on the support shaft 17, and the head base 15 is pushed upward by the elastic force of the torsion spring 18 in the support 41117 direction. Movement is restricted by Natsu 19, who is in a secret situation. Then turn the 2 nut 19 to erase the audio.

Dropping and audio control: Hold roll head 7.

Azimuth adjustment screw 10. Tilt adjustment screw 11, screw 1
2. The entire ACE head block, which is composed of the wobbling spring 13, the head plate 14, and the head base 15, is configured to be adjustable in the height direction (two directions).

The ACE head block is tall, and is centered on the spindle 17 at the second stroke while its contact movement is regulated by the taper nut 21 whose width is measured by the screw chassis (20), which is installed on the chassis 16 by the torsional force of the torsion spring 18. ’ axis is biased counterclockwise. The reaction force of the torsional force is the force of the chassis 16.

16a. And Aori style.

The adjustment screw 11 can be used to adjust the tilt, the azimuth adjustment tip 10ζ to adjust the iron azimuth, the nut 19 to adjust the height, and the taper nut 21 to adjust the running direction t.

However, with regard to making the VTR set thinner, it is disadvantageous in the following points. That is, as shown in FIG. 5, even if the taper nut 21 is raised upwards by a degree or so, it remains below the tape running position and does not interfere with the movement of the magnetic tape 2 into and out of the cassette 1. Considering the two points that the ACE head's position in the tape running direction fl & can be sufficiently achieved by vertical movement, the distance between the chassis 16 and the cassette 1 cannot be reduced, and if the current method is followed, there will be a major obstacle to thinning. becomes.

If we assume that the taper amount is large in order to reduce the amount of vertical movement wJ of the taper nut 21, then as shown in FIGS. Then f of taper nut 21
The suppressing force along the I+ plane increases, making the position regulation unstable and unreliable.As shown in Figure 6,
Thinner set.

It is essential to shorten the distance between the chassis 16 and the cassette l, and the aim of thinning is to create a positioning system that is more complicated and difficult to adjust than the methods described above.

The drawback was that it had to be regulated.

The present invention was developed in view of the above-mentioned situation, and aims to provide an adjusted magnetic head S8 that can shorten the distance between the chassis and the cassette and make the VTR set thinner. .

[Requires f% of invention]

The magnetic head adjustment mechanism of the present invention consists of a head/plate to which an audio erasing head and an audio control head are fixed at predetermined positions to a magnetic tape fed through a rotary cylinder, and a head plate that is mounted on a vertical plate on a chassis. a head base, one end of which is displaceably attached to an upright support shaft with a torsion spring interposed in the axial direction of the support shaft, and the other almost opposing end supported by a magnetic tape running direction position adjustment member; A tilt adjustment means and an azimuth adjustment means formed on the upper surface of the base with the head plate interposed therebetween, and the chassis of the support shaft and the head base are attached to urge the head base to rotate toward the cassette case side. the torsion spring attached thereto; It is formed of a worm gear mounted on the chassis meshing with the section, the axis of which is parallel to the chassis.

[Embodiments of the invention]

Hereinafter, the magnetic head V4 adjustment mechanism of the present invention will be described as an embodiment, and the same parts as the conventional one will be denoted by '+f' and the explanation of the structure of the same parts will be omitted and will be explained with reference to FIGS. 9 to 11.

do. FIG. 89 is a front view, and FIGS. 10 and 11 are a right side view and a front view, respectively, partially shown in cross section. In the figure, an audio control head 7 and an audio erasing head 6 for erasing audio track signals are arranged so as to come into contact with a magnetic tape 20 at a desired position. The head plate 14 holds the audio erasing head 6 and the audio control head 7, and has an azimuth adjustment screw 1.
0, Aoriji set screw 11. Screw 12, looseness spring 13
The center support of the head base 15 is supported by the protrusion 15a and is configured to allow azimuth adjustment and tilt adjustment.

The tilt R adjustment screw 11 is screwed into the head plate 14, and the azimuth adjustment screw 10. The screw 12 is fitted with a radose 15, and the azimuth adjustment screw 101 and the screw 12 are loosely fitted into the hole of the head plate 14. The tip of the tilt adjustment screw 11 is inserted into the concave part (not shown) of the head base 15, and the protrusion 15a of the head base 15 is inserted into the head plate 140 (not shown).
It is against the law. The rattling spring 13, through which the screw 12 is inserted, is compressed between the head of the screw 120 and the head plate 14, and always suppresses the head plate 14 in the direction ζ of the head base 15. When the azimuth adjustment screw 10 is turned, the head plate 14 including the audio erasing head 6 and the audio control head 7 moves alternately (seesaw-like) within the Z-X plane around the line connecting the tilt adjustment screw 11 and the protrusions 15a to 15f. The azimuth changes by doing this. When the tilt adjustment screw 11 is moved in the same direction, it rotates around the line connecting the azimuth adjustment screw 10 and the protrusion 15a8, and the tilt and azimuth change simultaneously. The azimuth adjusting screw 11 and the head plate 14 form an azimuth adjusting means; the tilt adjusting screw 10 and the head plate 14 form a tilt adjusting means.

On the other hand, a sleeve 15b is caulked to the head base 15, and a hole in the sleeve 15b is parallel to the Z-axis, and a support shaft 17 set up on the chassis 16 is loosely fitted into the sleeve 15b. A torsion spring 18 is held between the chassis 16 and the helad base 15 on the support shaft 17.
The elastic force of the rod base 15 is pushed upward in the axial direction of the support shaft 17, and the threaded portion 17a of the support shaft 17
Movement is restricted by a nut 19 that is screwed in. By turning the nut 19, the azimuth adjustment screw 10, the tilt adjustment screw 11, the screw 12 including the audio control head 7, the audio eraser 1'6,:t-7'
, looseness spring 13, head plate 14, head base 15
The entire ACE head block is configured to be adjustable in the height direction (Z direction).

As shown in FIG. 9, a plurality of substantially tooth-shaped uneven portions 15c are provided on the end surface of the head base 15 on the other side, which is substantially opposite to the position where the sleeve 15b is crimped. Chassis 1 (overhanging bent portion 16b, 1
Worm gear 22 rotatably supported by 6c
It is coupled with gears. Audio erase head 6, audio control head 7 included, azimuth adjustment screw 10, tilt adjustment screw 11, screw 12, biasing spring 1
3. The ACE head block, which is composed of a head plate 14 and a head base 15, has a torsion spring 18.

While its movement is restricted by the worm gear 22 due to the frictional force, it is urged to rotate counterclockwise about the support shaft 17 in FIG. 9 as a central axis.

Further, the outer circumferential portion of the worm gear 22 is carved with a low left as shown in Figure N12 so that the IA can be easily aligned with a finger, as shown in Figure N12 (D).

The worm gear 22 is placed on the same axis of the worm gear 22 as shown in FIG.
A part 22a is provided with a hexagonal fitting part 22a for fitting with a tool such as a wrench, so that it can be shaped into a small pot with a tool such as a wrench. Then, the head bar 3 is applied to the worm gear 22 attached to the overhanging bent portions 16b and 16c of the chassis 16.
A dish-shaped hole is provided in the overhanging bent portion 16c, which receives the 150-turn biasing force, to support the worm gear 22 with minimal play with the rotating shaft, and the overhanging bent portion 16b is A horizontal U-groove is provided for easy installation. The concavo-convex portion 15c provided on the head base 15 is formed to have a sufficient tooth thickness so that the head base 15 does not come off the tooth surface of the worm gear 22 even when the height of the head base 15 is adjusted.

Tilt, azimuth, and height adjustments are made in the same way as before, and the position in the tape running direction can be easily adjusted by rotating the worm gear with your fingers or a designated tool. There is. Therefore, unnecessary play and rotational movement can be suppressed by the biasing force of the torsion spring, and the distance between the chassis 16 and the cassette 1 can be shortened.

As described above, the magnetic head adjusting member of this embodiment has a simple structure, and the azimuth, tilt, and height adjustments can be easily made individually as in the conventional case, and the position in the tape running direction can be adjusted using the worm gear with your finger or a tool. The structure is designed to be easy to use, and by installing a worm gear, the distance between the cassette case and the chassis can be shortened.

Can be made thinner.

〔Effect of the invention〕

As described above, the magnetic head adjustment II mechanism of the present invention has the following features:
This has the effect of shortening the distance between the cassette and the chassis and making the VTR set thinner.

[Brief explanation of drawings]

Fig. 1 is a plan view of a VTR, Fig. 2 is a plan view of a conventional magnetic head adjustment mechanism, Figs. 3 and N4 are a right side view ζ front view showing a part of Fig. Figures 6 and 6 are the same as in Figure 4, respectively. - An explanatory diagram of the pan nut, FIGS. 7 and 88 are illustrations of the action of the taper nut shown in FIGS. 5 and 86 on the head base, respectively; FIG. 9 is a plan view of an embodiment of the magnetic head adjustment mechanism of the present invention; Figures 11 and 11 are a right side view and straight view showing a part of Figure 9 in cross section, respectively, and Figures 12 (a), (b), (c) and (d) are respectively part A in Figure 10. It is an explanatory view seen from each direction. 1...cassette, 2...magnetic tape. 5...Rotating cylinder. 6...Audio erase head. 7.-: t-7' iocontrol head. 10... Azimuth adjustment screw 11... Tilt adjustment screw. 14... Head plate 15-... Head base. 15C...Uneven portion, 16...Chassis. 17... Support shaft, 18... Torsion spring. 22... Worm gear. No. 50 1/B No. 60 116 No. 72 No. 4 72nd Country (A) 5

Claims (1)

[Claims] 1. A head plate with an audio erasing head and an audio control head fixed to the top surface, which contact the magnetic tape sent through a rotating cylinder at a predetermined position, and one end attached to a support shaft vertically mounted on the chassis. A head base is formed by interposing a torsion spring in the axial direction of a support shaft so that the head base can be displaced and whose other ends substantially opposing each other are supported by a magnetic tape running direction position adjustment member, and the above-mentioned head plate is interposed on the upper surface of the head base. and the torsion spring, which is attached between the chassis of the support shaft and the head base, and urges the head base to rotate toward the cassette case side. In the above, the traveling direction position adjustment member is mounted on the chassis that engages with a gear-shaped uneven portion formed on the other end of the substantially opposing heel rod base whose one end side is supported by the support shaft, and on the chassis that engages with the uneven portion. A magnetic head adjustment mechanism characterized by being formed from a worm gear whose axes are parallel to each other.