JPH0419614Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a displacement device for a magnetic head.
A conventional method for determining the amount of vertical movement of a magnetic head in the width direction of the tape relative to the magnetic head is to use a holder that holds the magnetic head on a stepped cam surface. By applying a screw connected to the cam surface and rotating the cam surface, the holding base is moved in the vertical direction of the width of the tape, thereby moving the magnetic head up and down. However, with the above method, it is difficult to achieve accuracy in the amount of vertical movement due to structural reasons, and since a cam mechanism is used to move the magnetic head up and down, the vertical movement device for the magnetic head must be correspondingly large. I didn't get it.

The present invention is intended to solve the above-mentioned problems, and its purpose is to improve the accuracy of the amount of displacement of the magnetic head in the width direction of the tape associated with the magnetic head. Another object is to downsize the displacement device for the magnetic head. The features of the present invention include: a guide shaft for guiding the magnetic head in the width direction of the tape with which the magnetic head comes into contact; a driving means linked to the guide shaft for driving the guide shaft in the width direction of the tape; a pair of bearings that slidably hold the guide shaft at two locations; and a pair of bearings that are slidably and fixedly mounted on the guide shaft between the pair of bearings, and that cooperate with the pair of bearings to hold the guide shaft. regulating means for determining a predetermined amount of displacement of the shaft;
It consists of a point consisting of

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a base of a displacement device for a magnetic head, and the base 1 has an interior 1a.
is hollow, and holes 2 and 3 are vertically bored from the inside 1a to the outside. This hole 2,
Bearings 4 and 5 are fitted and fixed in the hole 3, and in particular, a retaining ring 22 is fitted in the hole 3 to prevent the bearing 5 from coming off. Further, the bearings 4 and 5 are fixed with adhesive to ensure their fixation. A guide shaft 6 extending to the outside is slidably held in these bearings 4 and 5, and a collar 7 as a regulating means is attached to a portion of the guide shaft 6 between the bearings 4 and 5 with a screw 7a. Fixed. This collar 7 is shown in FIGS. 1 and 2 showing the state in which the guide shaft 6 is located at the lowest position.
The collar 7 and the bearing 4 are attached so as to have a predetermined gap width W, and this gap width W is the amount of displacement of the tape in the width direction in relation to the magnetic head 12, which will be described later, of the guide shaft 6. It is considered to be the amount of vertical movement. In the case of this embodiment, since 8-channel recording is performed using a 4-channel magnetic head, the gap width W is set to 0.4 mm. Setting this predetermined gap width W will be described later. The base 1 also has a protrusion 1b.
One end of the leaf spring 8 is fixed to the protrusion 1b by a presser plate 9 and a fixing device 10 such as a screw, and the other end is integrally embedded in a magnetic head holder 11, which will be described later. (so-called insert molding). As a result, the magnetic head holder 11 is fixed to the base 1 via the leaf spring 8, and the magnetic head 12 attached to the magnetic head holder 11 can be rotated in the direction F in FIG. As soon as the guide shaft 6 and bearing 4 stop moving,
5 (in the H direction in FIG. 1 and in the G direction in FIG. 2).

One end of a magnetic head holder 11 is fixed to one end of the guide shaft 6 (upper end in the figure), and a ring member 1 is fixed to the other end of the guide shaft 6 (lower end in the figure).
3 and 14 are fixed at intervals. The magnetic head holder 11 extends toward the opposite side of the protrusion 1b, and its front shape is U-shaped with side walls 11a, 11a and a bottom wall 11b, as shown in FIG. ing. On the bottom wall portion 11b,
A projecting piece 15 is provided in a protruding manner, and adjusting screws 16, 16 are screwed into both side wall portions 11a, 11a so as to be movable forward and backward toward the inside thereof. The magnetic head 12 is
The protruding rear part 12a is attached to the projecting piece 15 with a fixing device 17 such as a screw,
The lower end of the side surface of the magnetic head 12 is fitted with an adjusting screw 1.
6 and 16 are brought into contact with each other to perform azimuth adjustment. The ring members 13 and 14 are
As shown in FIG. 4, rubbers 13a and 14a are sandwiched between ring members 13b and 14b and washers 13c and 14c.
It has a structure that can absorb overstroke.

Between the ring members 13 and 14, the drive piece 1
8 is engaged. This drive piece 18 is provided with a drive lever 20, which is linked with a solenoid 19. Solenoid 19 is 2
It is of a directional energization type, that is, a self-holding type, and is attached to a frame (not shown) that is integrated with the base 1. This solenoid 19 has a rod 19a that expands and contracts according to its operation, and an operating pin 19b is provided at the tip of the rod 19a, and this operating pin 19b engages with a groove 20a of the drive lever 20. The state of expansion and contraction of the rod 19a is communicated. The drive lever 20 is rotatably supported by a pin 21 provided on a frame (not shown). Therefore, the drive lever 20 is connected to the rod 1.
It rotates clockwise or counterclockwise using the pin 21 as a fulcrum depending on the expansion/contraction state of the drive piece 9a.
and the ring member 13 engaged with the drive piece 18,
The guide shaft 6 is moved up and down via the shaft 14.

Next, the effect will be explained.

First, to determine a predetermined gap width W between the collar 7 and the bearing 4, a spacer jig (not shown) having the predetermined gap width W is installed between the collar 7 and the bearing 4, and then Bearing 5 in hole 3
At the same time, the retaining ring 22 is also press-fitted. Note that the spacer jig may be of any type as long as it can determine a predetermined gap width W, and examples of such a jig include a horseshoe-shaped one. In this state, the collar 7 is fixed to the guide shaft 6 with the screw 7a, and then the spacer jig is extracted from between the bearing 4 and the collar 7. Therefore, the predetermined gap width W between the bearing 4 and the collar 7 in FIGS. 1 and 2 depends only on the spacer jig that is made with high precision. The accuracy of the gap width W can be made high without being affected by the dimensional error of 7. Note that there are several types of spacer jigs depending on the gap width W, so that a desired gap width can be obtained.

Next, when the solenoid 19 is turned on in the state shown in FIG. 1 and FIG. Rotate counterclockwise. The drive lever 20
Due to this rotation, the drive piece 18 comes into contact with the ring member 13, and the guide shaft 6 is lifted upward in the figure.
The guide shaft 6 has a gap width W from the state shown in FIG.
When the guide shaft 6 is lifted up, the collar 7 fixed to the guide shaft 6 comes into contact with the bearing 4, and the guide shaft 6 is prevented from rising any further. Therefore, the magnetic head 12 is lifted by the gap width W together with the magnetic head holder 11.

When the solenoid 19 is turned off, the rod 19a extends from the solenoid 19, and the operating pin 19b rotates the drive lever 20 clockwise in FIG. 1 with the pin 21 as the intersection point. As the drive lever 20 rotates clockwise, the drive piece 18 comes into contact with the ring member 14, and the guide shaft 6 is lowered, and the guide shaft 6, the magnetic head holder 11, and the magnetic head 12 are moved downward.
returns to the position shown in FIG. During these operations, the magnetic head holder 11 is fixed to the base 1 via a plate spring 8 extending horizontally in the figure, so the magnetic head holder 11 is fixed to the base 1 by the action of the plate spring 8. The orientation of magnetic head 11 is defined, and therefore the position of magnetic head 12 is precisely determined.

As is clear from the above description, the present invention has the following effects.

Since the amount of displacement of the magnetic head in the width direction of the tape with which the magnetic head comes into contact is set by the spacer jig, the amount of displacement is highly accurate.

Since the predetermined displacement amount of the guide shaft is determined using the pair of bearings and the regulating means, the device of the present invention can be downsized and its structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIG. 2 is a partially sectional right side view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. FIG. 2 is an enlarged partial cross-sectional view of a ring member attached to a guide shaft. 4, 5... bearing, 6... guide shaft, 7... collar, 12... magnetic head, 19... solenoid.

Claims (1)

[Claims for Utility Model Registration] A guide shaft for guiding a magnetic head in the width direction of the tape with which the magnetic head comes into contact; and a driving means linked to the guide shaft for driving the guide shaft in the width direction of the tape. , a pair of bearings that slidably hold the guide shaft at two locations, and a bearing that is slidably and fixedly mounted on the guide shaft between the pair of bearings and cooperates with the pair of bearings. A displacement device for a magnetic head, comprising: a regulating means for determining a predetermined amount of displacement of the guide shaft.