JPH0594686A - Tape cassette - Google Patents

Abstract

PURPOSE:To accurately mount a leaf spring without generating a positional deviation when the leaf spring is mounted, in a tape cassette constituted so that the leaf spring for pressing the center part of a tape reel is mounted at the internal surface side of an upper half of the cassette case. CONSTITUTION:A long hole 16 is formed on the leaf spring 13, and also positioning protrusions 17a, 17b are provided on the internal surface side of upper half 3, and the long hole 16 is engaged with the positioning protrusions 17a, 17b when the leaf spring 13 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly to a tape cassette provided with a leaf spring for pressing the central portion of a tape reel.

[0002]

2. Description of the Related Art First, a conventional tape cassette will be described with reference to FIGS. The tape cassette illustrated here is a so-called beta type video cassette. In the figure, 1 indicates a tape cassette as a whole,
Reference numeral 2 denotes a cassette case, and the cassette case 2 is formed by integrally fixing an upper half (cover half) 3 and a lower half (base half) 4, and a pair of left and right magnetic tapes T are wound inside thereof. The tape reel 5 is rotatably stored.

The tape reel 5 includes a hub 6 around which a magnetic tape T is wound, as shown in FIG.
And a transparent upper flange 8 fixed in parallel with the lower flange 7 on the upper surface side of the hub and corresponding to the reel shaft insertion hole 9 formed at the bottom of the lower half 4. It is stored and arranged. Further, a reel shaft engaging recessed hole 10 is formed on the lower surface side of the central portion of the tape reel 5, and when the tape cassette 1 is mounted on a cassette tape recorder, the reel shaft engaging recessed hole 10 is provided on the tape recorder side. The tape reel 5 is rotationally driven by inserting and engaging the reel drive shaft.

The magnetic tape T wound on the tape reel 5 passes through a predetermined tape guide system in the cassette housing 2 and is exposed and exposed on the front surface of the cassette housing 2. Usually, this portion is exposed. Blocked and protected by 11. That is, the lid 11 is attached to the front side of the cassette housing 2 so as to be vertically rotatable, and the exposed portion of the magnetic tape is closed by the lid 11 when the tape cassette is stored (when not in use). When the tape cassette 1 is mounted on the cassette tape recorder, the lid 11 is rotated upward by the mechanism on the tape recorder side to expose the magnetic tape.

Further, a transparent window portion 12 is provided on the upper half 3 of the cassette housing 2 so as to correspond to the tape reel 5 on one side, and the transparent reel portion 12 is wound around the tape reel 5 through the transparent window portion 12. The remaining amount of magnetic tape is visible. Further, on the inner surface side of the upper half 3, a leaf spring 1 for pressing the left and right tape reels 5 so as not to rattle
3 is attached. The leaf spring 13 generally has a shape as shown in FIG. 6A or 6B, that is, the leaf spring 13 has a length that extends between the center portions of the left and right tape reels 5 and the central fixed portion. It is composed of the surface portion 13a and the spring action surface portions 13b on both sides thereof. Fixing recesses (or holes) 14 are formed at two locations on the fixing surface portion 13a, and the fixing recesses (or holes) are attached by caulking to fixing pins 15 projecting on the inner surface side of the upper half 3 in this portion. Spring action surface portion 13
b is bent at a predetermined angle with respect to the fixed surface portion 13a, and the tip end of this spring action surface portion 13b is the tape reel 5.
Is pressed against a central protrusion 5a protruding from the central portion on the upper surface side of the tape reel 5, and the spring force of the tape reel 5 always presses it downward so that it does not unnecessarily rattle when the tape cassette is stored. When mounted on a cassette tape recorder, it reliably engages with the reel drive shaft on the tape recorder side and acts so as to enable stable tape running.

By the way, it is considered that the leaf spring 13 for pressing the tape reel 5 as described above has a divided shape as shown in FIG. 6C in order to reduce the material thereof. That is, in this case, the leaf spring 13 of FIG.
The material is reduced by dividing it into two parts at the center of 3a and shortening the length of each spring action surface part 13b. Each of these short leaf springs 13 is attached by caulking to the inner surface side of the upper half 3 in one fixing hole portion 14 of the fixing surface portion 13a.

[0007]

However, when trying to realize the leaf spring 13 as shown in FIG. 6C,
When the leaf spring 13 is attached to the upper half 3, there is a problem that the leaf spring 13 is easily displaced. That is, when mounting the leaf spring, the leaf spring 13 is placed on the upper half 3 with the upper half 3 turned upside down.
Then, the plate spring 13 may be caulked in a direction deviated from an accurate position due to the influence of vibration or the like. In such a case, the tip of the spring action surface portion 13b of the leaf spring 13 does not exactly correspond to the central protrusion 5a of the tape reel 5, and therefore the leaf spring 1
Since No. 3 cannot exhibit the function as a reel pressing spring, the tape cassette becomes defective.

The present invention has been made in view of the above points,
An object of the present invention is to provide a tape cassette having a structure capable of preventing a positional displacement when a leaf spring is attached with a simple structure.

[0009]

In order to achieve the above object, the present invention provides a cassette reel in which a tape reel wound with a tape is rotatably housed and an inner surface side of the cassette casing. A tape cassette in which a leaf spring for pressing the central portion of the tape reel is attached to the tape cassette, wherein a hole is formed in the leaf spring and a positioning protrusion corresponding to the hole of the leaf spring is provided on the inner surface side of the cassette housing. Is.

[0010]

In the tape cassette of the present invention constructed as described above, the hole is engaged with the positioning projection when the leaf spring is attached, so that the leaf spring is fixed in an accurate state without displacement. , Reliably exerts the function as a reel pressing spring.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to FIGS. 1 to 3, and the portions corresponding to those in FIGS.

In the tape cassette according to the present invention, the short leaf springs 1 arranged corresponding to the left and right tape reels, respectively.
3, a long hole 16 is formed in the spring action surface portion 13b along the length direction. On the other hand, on the inner surface side of the upper half 3 forming the cassette housing, the long hole 16 of the leaf spring 13 is provided.
Corresponding to, two positioning protrusions 17a and 17b are provided in a protruding manner. These positioning protrusions 17a and 17b have a cylindrical shape with a diameter substantially equal to the width of the elongated hole 16 of the leaf spring 13,
It is provided on a straight line connecting the fixing pin 15 and the central portion of the tape reel 5.

In the configuration of this embodiment as described above, the leaf spring 13
1A, the leaf spring 13 is first placed on the inner surface side of the upper half 3 as shown in FIG. 1A, the fixing hole portion 14 is engaged with the fixing pin 15, and the elongated hole 16 is positioned by the positioning protrusion 17a. Engage with 17b. In this state, the spring action surface portion 13b of the leaf spring 13 is in contact with the upper half 3 and the fixed surface portion 13a is in a state of being floated in an inclined shape from the upper half 3.

From this state, an ultrasonic horn is pressed from above the fixing pin 15 to melt and caulk the head of the fixing pin 15 so that the leaf spring 13 is raised at its fixing surface portion 13a as shown in FIG. Fixed to half 3.
In this fixed state, the leaf spring 13 has the spring action surface portion 1
3b is in a state of being floated up in an inclined shape from the upper half 3, and even in this state, the engagement between the positioning projection 17a on one side (the side close to the fixing pin 15) and the elongated hole 16 is maintained. ..

As described above, in this embodiment, the long hole 16 is fixed to the positioning protrusion 1 before the leaf spring 13 is fixed by caulking.
By engaging with 7a and 17b, the leaf spring 13 is fixed in the correct direction without displacement, and even after the leaf spring 13 is fixed by caulking, the positioning protrusion 17a on one side is long. Since the leaf spring 13 is engaged with the hole 16, the leaf spring 13 is not displaced even after being fixed, and is always held in an accurate fixed state.

Further, in this embodiment, since the long hole 16 is formed in the leaf spring 13, it is possible to realize an appropriate pressing force against the tape reel. That is, in the case of a leaf spring having a short length as in this example, the spring force is too strong as it is as compared with the above-described conventional leaf springs shown in FIGS. 6A and 6B, which hinders the rotation of the tape reel. However, by forming the elongated hole 16 like the leaf spring of this example, the spring force is appropriately weakened, and the tape reel can be pressed with a force similar to that of the leaf spring of FIGS. 6A and 6B. Is.

[0017]

As is apparent from the above description, according to the present invention, a hole is formed in the leaf spring for pressing the tape reel, and a positioning protrusion corresponding to the hole of the leaf spring is provided on the inner surface side of the cassette housing. Since the hole is engaged with the positioning protrusion when the leaf spring is attached, the leaf spring is fixed in an accurate state without displacement, and the function as the reel pressing spring can be surely exhibited. ..

[Brief description of drawings]

FIG. 1 is an explanatory diagram of how a leaf spring is attached in an embodiment.

FIG. 2 is a plan view of a leaf spring in the example.

FIG. 3 is a perspective view of a leaf spring and its mounting portion in the embodiment.

FIG. 4 is a perspective view of a tape cassette.

FIG. 5 is a vertical sectional view of the tape cassette.

FIG. 6 is an explanatory view of the shape of a conventional leaf spring.

[Explanation of symbols]

 1 Tape cassette 2 Cassette housing 3 Upper half 5 Tape reel 13 Leaf spring 16 Long hole 17a, 17b Positioning protrusion

Claims (1)

[Claims] 1. A cassette reel in which a tape reel having a tape wound therein is rotatably accommodated, and a leaf spring for pressing a central portion of the tape reel is attached to an inner surface side of the cassette casing. In the tape cassette,
A hole is formed in the leaf spring, and a positioning protrusion corresponding to the hole of the leaf spring is provided on the inner surface side of the cassette housing, and the hole engages with the positioning protrusion when the leaf spring is attached. The tape cassette is characterized in that the leaf spring is prevented from being displaced by being damaged.