JPH0313644B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head vertical movement device for moving a magnetic head in the width direction of a tape.

Traditionally, a two-channel magnetic head has been used to
8-channel recording on magnetic tape using a track or 4-channel magnetic head;
Also, magnetic recording and reproducing devices are used to reproduce the signals and data. In this device, it is necessary to move the magnetic head in the width direction of the tape (this is called the vertical direction).

For example, the device for vertically moving the magnetic head used in conventional magnetic recording and reproducing devices is
-There is one shown in Publication No. 18968. The outline of this vertical movement device for the magnetic head is as shown in FIGS. 1 and 2, and the magnetic head mounting plate 2 to which the magnetic head 1 is attached has an adjustment screw 3 in contact with the lower surface of the rotating cam 4. The upper and lower positions are determined by
The rotation of the rotating cam 4 causes the magnetic head 1 to move up and down.

In a device for vertically moving a magnetic head, it is essential to uniquely determine the position of each magnetic head in order to achieve good tracking. Since there is play between the magnetic head 2 and the boss 7, in order to prevent this play from affecting the position of the magnetic head 1, the distance between the support rod 6 and the guide rod 5 should be increased, and the Rod 6 and boss part 7
As a result, the magnetic head vertical movement device had to be large in size, and while good tracking could be maintained, the device itself could not be made smaller.

In order to solve the above-mentioned drawbacks of the conventional art, the present invention provides a moving guide section integrally with a holding base that holds a magnetic head, and allows the guide section to guide the vertical movement, and the above-mentioned holding base is attached to a plate spring. The magnetic head is attached to the base via the magnetic head, and the characteristics of the leaf spring are effectively used to accurately position the magnetic head, and the device itself can be made compact.

An embodiment of the present invention will be described below based on the drawings. 3 is a plan view showing the present invention, FIG. 4 is a partially cutaway side view of the same, and FIG. 5 is a partially cutaway front view of the same. In the figure, reference numeral 11 denotes a base that is a part of the decoration main body, and the inside of the base 11 is hollow, and there are holes 13 for holding the guide shaft 12 on the top and bottom,
14 are perforated. Slide bearings 15 and 16 are fixed to these holes 13 and 14, and these slide bearings 15 and 16 allow the guide shaft 12 to
A sliding guide is provided when the is moved up and down. Bearing 1
A collar 17 for determining the distance when the guide shaft 12 moves up and down is fixed to the guide shaft 12 with a screw 18 between the collars 5 and 16.
In FIG. 4, the collar 17 and slide bearing 1
5 is the gap width W, and in the case of this embodiment, since 8-channel recording is performed using a 4-channel magnetic head, the amount of gap is as small as 0.4 mm. be.

A head holder 20 with a magnetic head 19 attached thereto is fixed to the upper end of the guide shaft 12 by screws, and ring members 21 and 22 are fixed to the lower end. The magnetic head 19 has a structure in which a rear part 23 protrudes, and the rear part 23 is attached to a holding base 2.
Screw 25 in contact with protrusion 24 raised from 0.
The azimuth can be adjusted by fixing the screws 26 on both sides with adjustment screws 26 screwed into the holding base 20.

The magnetic head holder 20 described above is attached to the base 11 via a leaf spring 27. Leaf spring 2
7 holds the holding stand 20 by embedding one side in the holding stand 20 and fixing the other side to the base 11 with a presser plate 28 and screws 29, and the magnetic head holding stand 20 is , the magnetic head 19 rotates around the guide shaft 12 (downward in FIG. 3).
In addition, the structure is designed to avoid the effects of play between the guide shaft 12 and the slide bearings 15 and 16 (in the direction G in FIG. 4 and in the direction H in FIG. 5).

A two-way energized, self-holding type solenoid 30 is mounted on a frame (not shown) that is integrated with the base 11, and the operating pin 31 of the solenoid 30 is driven to rotate around a shaft 32. By rotating the lever 33, the guide shaft 12 is moved up and down. Therefore, when the solenoid 30 is operated in the state shown in FIG. The collar 17 is fixed to the guide shaft 12, and when the guide shaft 12 is raised by the distance W shown in FIG. 4, the collar 17 comes into contact with the slide bearing 15. Therefore, the guide shaft 12 is prevented from rising any further, and as a result, the magnetic head holder 20, ie, the magnetic head 19, rises by a predetermined amount. When the solenoid 30 operates next time, the drive lever 33 is rotated clockwise, so that the guide shaft 12 is lowered and returned to the position shown in FIG. 5. During these operations, the magnetic head holding base 20 is fixed to the base 11 via a plate spring 27 extending in the horizontal direction (perpendicular to the moving direction of the magnetic head). 2
7, the attitude of the magnetic head holder 20 is regulated, and therefore the position of the magnetic head 19 is also accurately determined.

As shown in detail in FIG. 6, the ring members 21 and 22 have a structure in which a rubber 37 is sandwiched between an E ring 35 and a washer 36, and the overstroke of the drive piece 34 of the drive lever 33 is It has a structure that can absorb

In addition, to determine the gap width W between the collar 17 and the slide bearing 15, a spacer jig having this gap width is installed between the collar 17 and the slide bearing 15, and the slide bearing 16 is press-fitted and stopped. Press fit ring 38 and slide bearing 1
6 and then remove the spacer jig, the above gap width will be the same as the slide bearings 15 and 1.
6. It can be determined without being influenced by the dimensional error of the collar 17.

In the above embodiment, the head holder is fixed to a guide shaft that serves as a guide during movement, and this guide shaft is movably held by a support unit integrated with the base. The head holder may be fixed to a moving guide portion movably held on a shaft fixed to the base, and the head holding base may be attached to the base via a leaf spring.

As explained above, according to the present invention, the holder holding the magnetic head is attached to the base via a leaf spring, and the posture of the magnetic head holder is determined by the leaf spring. This allows accurate positioning of the magnetic head and does not require an enlarged device.

[Brief explanation of the drawing]

1 is a plan view showing a conventional example, FIG. 2 is a side view of the same, FIG. 3 is a plan view showing a vertical movement device for a magnetic head according to the present invention, FIG. 4 is a partially cutaway side view of the same, and FIG. The figure is a partially cutaway front view of the same part, and FIG. 6 is a diagram for explaining details of the ring member. 11... Base, 12... Guide shaft, 15, 16
...Slide bearing, 17...Collar, 19...Magnetic head, 20...Magnetic head holder, 27...
Leaf spring, 30... Solenoid, 33... Drive lever.

Claims (1)

[Claims] 1. A holding base that holds a magnetic head, a moving guide part that is integrated with the holding stand, a supporting part that movably supports the guide part, a base that is integrated with the supporting part, and a base that moves the moving guide part up and down. A vertical movement device for a magnetic head, comprising a moving means for moving the magnetic head, and the holding stand is attached to the base via a plate spring.