JPS6213226Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an easy-to-adjust magnetic head adjustment device that can obtain the optimum position of the magnetic head in a magnetic recording/reproducing device and can withstand shocks.

In the conventional magnetic head adjustment device, Fig. 2,
Since there is no locking member 16 shown in Fig. 3, there is a lack of stability against external forces such as vibrations and shocks, and there is a risk that external forces such as vibrations, shocks, and rocking may be applied due to the wide variety of usage conditions. Performance reliability has been an issue when applied to certain portable devices. To solve this problem, a locking member is added to solve the problem, but the locking member gets in the way during the adjustment work of the magnetic head, causing complaints from the manufacturing side.

The object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an easily adjustable magnetic head adjustment device that can sufficiently withstand vibration, impact, rocking, etc.

In order to be able to sufficiently absorb external forces such as vibrations, shocks, and rocking, and not to interfere with adjustments, the magnetic head is mounted so that it can rotate in the tape running direction. (placement member 12)
The present invention provides a device in which a locking member having a tapered end other than the end in contact with the adjustment member is pivotally supported by a spring body or the like so as to be movable up and down, and rotation of the mounting member 12 is inhibited. Particularly, in order to facilitate adjustment work, a rib-like protrusion is provided on the outer periphery of the locking member, and the rib-like protrusion is used to facilitate the adjustment work.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a plan view of a magnetic tape running system of a video cassette tape recorder. Generally, the tape running path for recording and playback is cassette half 4.
The magnetic tape 4a pulled out from the tape is fed out from the feeding reel stand 9, passed through a tape guide 11, a tension pin 10, etc., wound around a rotating cylinder 5 having a rotating video head at a predetermined angle, and passed through the tape guide 11 again. , and a capstan 1a rotated by a capstan motor 1 via an audio control head 3 and a tape guide 11.
and is driven by the pinch roller 2 and wound onto the take-up reel stand 8. The take-up reel stand 8 is rotated by a take-up idler 6 to which power is transmitted from the capstan motor 1.

In the apparatus configured as described above, when reproducing the magnetic tape 4a on which video or audio signals have been recorded, the control pulses recorded on the control track 4b of the magnetic tape 4a (Fig. 3) are transferred to the control head. It is necessary to adjust the position of the audio control head 3 with respect to the tape running direction so that the tape 3a can be traced accurately.

As an example of the structure of the present invention, the main parts will be explained with reference to FIGS. 2, 3, and 4. The head shaft 20, the locking member shaft 21, and the adjusting member shaft 22 are set up on the base 7. A mounting member 12 on which the audio control head 3 is mounted is rotatably supported on the head shaft 20 via a mounting member spring 15 so as to be rotatable up and down, and fixed with a locking nut 14. Further, the adjustment member shaft body 22 has a male screw,
An adjusting member 13 having a female thread and also having a tapered outer portion 13a is screwed into the adjusting member 13 and comes into contact with the end of the mounting member 12. The mounting member spring body 15 is a spring body to which an axial force and a rotational force in a certain direction are applied. It is locked to a protrusion 12a provided on the member 12. That is, the mounting member 12
is subjected to an upward axial force and a counterclockwise rotational force. Furthermore, the locking member shaft body 21 has vertical movement,
A locking member 16 having a locking portion taper 16a is rotatably supported, and a locking member spring body 17 is fixed by a washer 19 and a set screw 18 to apply a downward axial force to the locking member. It is strong. The locking member 16 is in contact with the other end of the mounting portion 12 on the opposite side to the one end with which the mounting member 13 is in contact.

The functions of this device configured in this way will be explained. As described above, the mounting member 12 is moved clockwise or counterclockwise with respect to the mounting member shaft 20 so that the control head 3a accurately traces the control pulses recorded on the control track 4b of the magnetic tape 4a. Rotate to adjust the position of the control head 3a. In this adjustment, by rotating the adjusting member 13 clockwise or counterclockwise, the adjusting member 13 moves up and down along the male thread of the adjusting member shaft body 22, and therefore the tapered portion 13a of the adjusting member 13 also moves up and down. Of course it will move. This tapered part 1
3a, the mounting member 12 also rotates, and the control head 3a also rotates. That is, by screwing in (lowering) the adjusting member 13 clockwise, the control head 3a will be rotated clockwise, and by turning the adjusting member 13 counterclockwise, the control head 3a will be rotated counterclockwise. You will have to move around. By this operation, a predetermined position of the control head 3a can be obtained. The height position of the control head 3a is determined by the axial force of the mounting member spring 15 and the locking nut 14.
Also, due to the rotational force of the mounting member spring body 15, the mounting member 1
2 is always applied with a counterclockwise rotational force. That is, it is always in contact with the tapered portion 13a of the adjustment member 13.

However, since it is biased by a spring body, if an external force such as vibration, impact, or rocking is applied to the mounting member 12.
The contact between the adjusting member 13 and the tapered portion 13a may not be maintained stably. That is, when the external force exceeds the load of the mounting member spring body 15, or even if it does not exceed the load, the vibration of the external force causes a resonance phenomenon, and the contact state becomes extremely unstable, resulting in problems such as image distortion. will be exposed.

As a suitable device to solve this problem, a locking member 1 is used to prevent clockwise rotation of the mounting member 12.
6 was established. The locking member 16 is a locking member spring body 1
7 applies a downward axial force, and the locking member taper portion 16a is brought into contact with the end surface of the mounting member 12 at a position where clockwise rotation of the mounting member 12 is to be inhibited. The locking member tapered portion 16a can suppress clockwise rotation and vibration of the mounting member 12, and
Since a constant load is always applied to the locking member tapered portion 16a by the locking member spring body 17, followability to the mounting member 12 in the counterclockwise direction is also good.

However, with the adjustment member 13, the control head 3
When adjusting the position of a, move the mounting member 12 clockwise.
When moving, adjustment cannot be made because the locking member 16 is present. Therefore, when making adjustments, it is necessary to continue lifting the locking member by hand until the adjustment is completed.
In order to deal with this problem, a rib-like protrusion 23 is provided on the outer periphery of the locking member 16. When adjusting, the rib-like protrusion 23 is hooked onto the mounting member 12 as shown in FIG. 4A. In this way, the locking member 16 does not get in the way during adjustment, which is very suitable. After adjustment, the rib-like protrusion 23 can be removed from the mounting member 12 as shown in FIG. 4b. As described above, the present invention provides a magnetic head adjusting device that is easy to adjust and has a simple configuration, which is sufficiently free from performance problems against vibrations, shocks, and rocking, and is therefore convenient for practical use.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the magnetic tape running path, Fig. 2 is a plan view of the device of the present invention, Fig. 3 is a front view of the device of the present invention, and Fig. 4 is a sectional view of the main parts of the device of the present invention. 5 are perspective views of essential parts of the device according to the present invention. DESCRIPTION OF SYMBOLS 1... Capstan motor, 1a... Capstan, 2... Pinch roller, 3... Audio control head, 3a... Control head, 4...
Cassette half, 4a... Magnetic tape, 4b... Control track, 5... Rotating cylinder, 6... Take-up idler, 7... Base, 8... Take-up reel stand, 9
...Feeding reel stand, 10...Tension pin, 11...
Tape guide, 12... Placement member, 12a... Protrusion, 13... Adjustment member, 13a... Taper part, 14...
Locking nut, 15... Placement member spring body, 16... Locking member, 16a... Locking member taper portion, 17... Locking member spring body, 18... Set screw, 19... Washer, 2
0... Placement member shaft body, 21... Locking member shaft body, 22...
Adjustment member shaft body, 23... rib-like projection.

Claims (1)

[Scope of utility model registration request] In a device for recording and reproducing video or audio signals on a magnetic tape, a magnetic head is mounted on a member that can rotate in the tape running direction, and the member is made of an elastic material to which an axial force and a rotational force in a constant direction are applied. At the same time, an adjustment member having a taper that can move up and down is in contact with one end thereof, and a locking member having a taper that can move up and down to which an axial force is applied is in contact with the other end. 1. A magnetic head adjusting device characterized in that a protrusion for temporarily stopping the function of the locking member is provided at at least one location on the outer periphery of the locking member.