JPH079226Y2 - Reel base structure of magnetic recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a technique for improving a reel stand of a magnetic recording / reproducing apparatus.

(Prior Art) Engagement between a general reel stand and a reel hub of a tape cassette is described in, for example, Japanese Utility Model Publication No. 63-31269.

That is, a reel drive unit is provided on the reel base so as to be movable up and down, and a claw is projected on the reel drive unit, and the reel hub is forcibly rotated by the claw.

(Problems to be solved by the invention) By the way, in the tape cassette, the width of the magnetic tape to be stored is diversified into 1 inch, 3/4 inch, 1/2 inch, and 8 mm,
Moreover, tape cassettes themselves are diversified, such as tapes of the same width can be recorded for a long time by changing the tape length.

In recent years, small-sized tape cassettes have been developed and put into practical use due to the widespread use of portable devices.

However, even in a small tape cassette, a reel hub having the same shape as the standard tape cassette is adopted in order to have compatibility with the standard size tape cassette.

In other words, a small tape cassette with a very small external dimension is equipped with a large-diameter reel hub, the tape storage space inside the case is narrowed, and the tape winding amount is limited, so the recording time must be very short. .

Further, since the large reel hub is attached to the small case, the external appearance is unbalanced and foreign matter such as dust easily enters.

Therefore, an object of the present invention is to reduce the size of the reel hub of a small cassette while maintaining compatibility with the standard cassette.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a reel base, a rotary shaft that penetrates through the center of the reel base and is rotated by drive means such as a motor, and is fitted to the rotary shaft. A first reel driving member having a first claw portion that engages with the small reel hub, and a second claw portion that is vertically movably fitted to the outer periphery of the first reel driving member and that engages with the standard reel hub And a second reel driving member having the above.

(Operation) The claw portion of the second reel drive member engages with the standard reel hub, and the claw portion of the first reel drive member engages with the small reel hub that is smaller than the standard reel hub, and each rotates the reel hub. To do.

In this way, since two types of reel hubs, large and small, can be fitted to one reel stand, the reel hub of the small tape cassette can be made extremely small and have a small diameter independently of the standard size. , A small tape cassette can be recorded for a long time.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a reel base structure of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is a sectional view taken along arrow II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG.

The reel base 1 is directly or indirectly driven by a drive means (not shown) such as a motor, and a rotary shaft 2 which is integrally fitted to the rotary shaft 2 and has three first claws at an upper portion thereof. A first reel driving member 3 having parts 3a, and the first reel driving member 3
A second reel driving member 4 which is slidably fitted to the outer periphery 3b of the second reel and has three second claw portions 4a on the upper part thereof, and a pushing-up means 5 of the second reel driving member 4. .

The first reel driving member 3 has a sufficiently small diameter, and the outer diameter formed by the first claw portions 3a of the first reel driving member 3 is also extremely small, so that the first reel driving member 3 is smaller than a standard reel hub (described later) in a small reel hub (described later). It has a corresponding shape.

The second reel driving member 4 has large claw portions 4a ... Which are adapted to a standard reel hub, and has a disk portion 4b and a receiving surface 4c in the lower portion.

The second reel driving member 4 is fitted to the outer periphery 3b of the regular hexagonal first reel driving member 3 through the regular hexagonal hole 4d as shown in FIG. 3, so that the rotational force is transmitted to each other. Each other.

The pushing-up means 5 is, for example, a coil spring, and the coil spring 5 stands up from a stopper block 6 screwed to the rotating shaft 2 as a starting point and pushes up the second reel driving member 4. The second reel drive member 4 can be lifted and lowered only between the upper stopper 3c (FIG. 1) on the lower surface of the first claw portion 3a and the lower stopper 6a on the upper surface of the stopper block 6.

The operation of the reel stand having the above structure will be described below.

4 and 5 (a) and (b) are explanatory views of the operation,
The small tape cassette 10 shown in FIG.
The small reel hub 12, reels 13 and 14, magnetic tape 15, etc. are stored inside, and the standard tape cassette 20 is a cassette half.
Standard reel hub 22, reels 23 and 24, magnetic tape 25 in 21
Etc. are stored.

One of the small tape cassette 10 and the standard tape cassette 20 is placed on the reel stand 1.

FIG. 5A shows the case of the standard tape cassette 20, in which the claw portions 4a of the second reel driving member 4 are engaged with the standard reel hub 22 and the reel 23 is the receiving surface 4c of the second reel driving member 4. Supported.

Therefore, the rotating shaft 2 rotated by a motor or the like transmits torque in the order of the first reel driving member 3 → second reel driving member 4 → reel 23, and winds the magnetic tape 25.

On the other hand, FIG. 5 (b) shows the case of the small tape cassette 10, in which the second reel driving member 4 is pushed down by the lower surface of the descended reel 13, and only the first reel driving member 3 enters the small reel hub 12. Then, the first claw portions 3a ...

Therefore, the rotating shaft 2 rotates the reel 13 via the first reel driving member 3.

In this way, one reel stand 1 is equipped with a small tape cassette 10
And the standard tape cassette 20 can be placed freely.

FIG. 6 is a view of another embodiment of FIG. 1, in which the second reel driving member 31 having a simple shape and a cup member 33 having a receiving surface 32 on the upper surface and screwed to the rotary shaft 2 are shown. Is characterized by.

FIGS. 7 (a) and 7 (b) are explanatory views of the operation of FIG. 6, FIG. 7 (a) shows a standard tape cassette, and FIG. 7 (b) shows a state in which a small tape cassette is placed.

In both of the embodiments shown in FIGS. 1 and 6, the first reel driving member 3 is fixed to the rotary shaft 2. However, the present invention is not limited to this, and only the first claw portions 3a ... It doesn't matter. The small tape cassette 10 can be placed smoothly if it is vertically movable.

Further, it is optional whether the reel bases 1 of the present invention are used in pairs or individually.

(Effect of the Invention) As described above, according to the present invention, one reel stand can be fitted with two types of reel hubs, large and small.
The reel hub of a small tape cassette can be made extremely small and have a small diameter independently of the standard size, which enables long-time recording of a small tape cassette.

[Brief description of drawings]

FIG. 1 is a sectional view of a reel stand structure of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is a sectional view taken along line II of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. 1, and FIG. 5 (a) and 5 (b) are explanatory views of the operation, FIG. 6 is another embodiment of FIG. 1, and FIGS. 7 (a) and 7 (b) are explanatory views of the operation of FIG. 1 ... Reel stand, 2 ... Rotation axis, 3 ... 1st reel drive member, 3a ... 1st nail | claw part, 3b ... Outer periphery, 4 ... 2nd reel drive member, 4a ... 1st Claws, 10 …… Small tape cassette, 12 …… Small reel hub, 20 …… Standard tape cassette, 22 …… Standard reel hub.

Claims (1)

[Scope of utility model registration request] 1. A reel stand of a magnetic recording / reproducing apparatus which meshes with a reel hub of a tape cassette and winds a tape by rotating the reel hub, wherein the reel stand passes through a center of the reel stand and is driven by a driving means such as a motor. A rotating shaft that rotates and fits on this rotating shaft,
A first reel driving member having a first claw portion that engages with the small reel hub, and a second claw portion that is vertically movably fitted to the outer periphery of the first reel driving member and that engages with the standard reel hub. A second reel driving member, wherein the standard reel hub is engaged with the claw portion of the second reel driving member, and the small reel hub smaller than the standard reel hub is claw portion of the first reel driving member. The reel base structure of the magnetic recording / reproducing apparatus is characterized in that the reel hub of the tape cassette is rotated by engaging with each other.