JPS593375Y2 - Kangekichiyouseisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gap adjustment device that adjusts the gap between, for example, a magnetic head and a head pressing roller.

Usually, the gap between the magnetic head and the head pressing roller is formed very narrowly (approximately 0.15 m/m), and a magnetic recording medium such as a magnetic tape, which is thicker than the above gap, is passed between them.

However, the gap is not fixed, but is designed to have an optimum dimension depending on the thickness of the magnetic recording medium.

Conventionally, the bearing part of the head holding roller was loosely inserted into the mounting hole of its support body and fixed with a nut, etc., and each time the gap was adjusted, the nut was loosened to find the optimum position, and then fixed again. ing.

Therefore, fine adjustment of the gap is difficult and requires skill, and there is a risk that the gap will expand with long-term use.

The present invention was developed based on the above circumstances, and its purpose is to provide a gap adjustment device that facilitates fine adjustment of the gap and does not cause any gap fluctuation even after long-term use. It is something.

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a board, and the board 1 has a mounting hole 2 in its upper part and a long hole 3 in its lower part.

An eccentric nut 4 is fitted into the mounting hole 2, as shown in FIGS. 2A and 2B.

It is as shown in C.

That is, the eccentric nut 4 has a protrusion 5 on one side that fits into the mounting hole 2 and projects shorter than the thickness of the board 1, and a hexagonal part 6 on the other side, and a lock bolt fitting hole 7 in these. is drilled.

The lock bolt fitting hole 7 consists of a large diameter part 7a and a small diameter part 7b, and this center line C1 is connected to the center line C2 of the eccentric nut 4 and S
It is eccentric by the amount.

A main lock bolt 8 is fitted into the lock bolt fitting hole 7 as shown in FIG.

The main lock bolt 8 has its head 8a connected to the large diameter portion 7a of the lock bolt fitting hole 7, its rod portion 8b to the small diameter portion 1b, and its threaded portion 8C protruding from this. It is screwed into the screw hole 10 of No. 1.

A second screw hole 11 is provided in the adjusting plate 9 below the first screw hole 10 and facing the elongated hole 3 .

An auxiliary lock bolt 12 is screwed into the second threaded hole 11 via the elongated hole 3.

Therefore, the adjustment plate 9 has main and auxiliary lock bolts 8.12
It is fixed in close contact with the substrate 1 by.

Further, a roller holder 13 is protruded from the lower part of the adjustment plate 9.
A shaft 14 is fitted into this roller holder 13.

At one end of the shaft 14, a head presser roller 15, which is a gap adjuster whose outer peripheral wall is wrapped with an elastic member such as a rubber material, is pivotally supported.

On the other hand, 16 has a narrow gap T between this head pressing roller 15 and
The magnetic head is a fixed body provided on the attached portion 16a.

When a magnetic tape that is thicker than the gap T between the magnetic head 16 and the head press roller 15 is inserted into the gap T, the outer circumferential wall of the head press roller 15 elastically contracts to nip and convey the magnetic tape. .

At this time, the magnetic head 16 obtains necessary information from the magnetic tape.

Next, means for changing the gap T will be explained.

First, the auxiliary lock bolt 12 is loosened to weaken the adhesion of this portion of the adjustment plate 9 to the substrate 1.

Next, loosen the main lock bolt 8 to weaken the fixing force on the eccentric nut 4.

Therefore, the adjusting plate 9 is no longer in close contact with the substrate 1.

Next, the hexagonal part 6 of the eccentric nut 4 is rotated using a tool such as a spanner.

That is, to narrow the gap T, the hexagonal part 6 is rotated in a direction in which the center line C1 of the lock bolt fitting hole 7 moves downward, and the adjusting plate 9 is lowered via the main lock bolt 8.

When widening the gap T, the center line C1 is rotated in a direction that moves upward, and the adjusting plate 9 is similarly raised.

D shown in FIG. 2C is a rotation locus of the center line C1.

After the desired gap T' is obtained by moving the adjustment plate 9, the main lock bolt 8 and the auxiliary lock bolt 12 are tightened to fix the adjustment plate 9.

In the above embodiment, the gap adjusting body 15 is formed as a head pressing roller, and the fixed body 16 is formed as a magnetic head, but the present invention is not limited to this, and is suitable for all devices that require fine adjustment of the gap amount. There's not much I can say.

As explained above, according to the present invention, an eccentric nut having an eccentric lock bolt fitting hole is fitted to the substrate, and a lock bolt having a gap adjustment body screwed into the lock bolt fitting hole is fitted. Since the fixed body is provided opposite the gap adjusting body, the lock bolt can be deflected with respect to the board by rotating the eccentric nut, and the amount of gap between the gap adjusting body and the fixed body can be adjusted. .

Therefore, unless the eccentric nut is rotated, the once set gap can be reliably maintained, and fine adjustment is easy and requires no skill.

Moreover, since it has a relatively simple structure, it has various effects such as being advantageous in terms of cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a partially cutaway side view of the gap adjustment device, Fig. 2 A is a back view of the eccentric nut, which is the main part, and B is a vertical side view thereof , C is a front view. 1... Board, 7... Lock bolt fitting hole, 4...
Eccentric nut, 8... (main) lock bolt, 15...
Gap adjustment body (head press roller), 16... fixed body (
magnetic head).

Claims (1)

[Scope of utility model registration request] A lock bolt fitting hole is formed at a position fitted to the substrate and eccentric from the center thereof, and a protrusion protruding shorter than the thickness of the substrate on one side and a protrusion on the other side that is fitted to the substrate. an eccentric nut having a polygonal head having a diameter larger than the drilled fitting hole; a lock bolt fitted into the lock bolt fitting hole of the eccentric nut; and a gap adjusting body fixed to the substrate, and a fixing body provided opposite to the gap adjusting body, and by rotating the eccentric nut, the lock bolt is deflected with respect to the substrate. , A gap adjustment device that adjusts the amount of gap between a gap adjustment body and a fixed body.