JPH1125642A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the stable rotation of a magnetic tape reel during traveling by fitting the reel drive shaft of a recording/reproducing device in the magnetic reel tape and forming a leaf spring to have a shape for pressing a magnetic tape in a vertical direction when the magnetic tape reel is in a rotatable state. SOLUTION: When a magnetic tape cassette 1 is inserted into a recording/ reproducing device, a reel drive shaft 40 is fitted to a magnetic tape reel 3, and the lower end of the magnetic tape reel 3 is raised. Thus, a gap is formed between the magnetic tape reel 3 and a lower cassette half 5, and the magnetic tape reel 3 is pressed by a pressing surface 25 as the tip part of an arm 22 from a vertical direction. Thus, the magnetic tape reel 3 is stably held without being inclined to the reel drive shaft 40, the stable rotation of the magnetic tape reel 3 during magnetic tape traveling is secured, and a magnetic tape is smoothly rewound/wound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring for accommodating a pair of magnetic tape reels for winding a magnetic tape in a cassette case composed of upper and lower cassette halves and pressing the magnetic tape reel downward of the cassette. The present invention relates to a magnetic tape cassette provided in a half.

[0002]

2. Description of the Related Art Conventionally, in audio equipment, video equipment, and the like, a magnetic tape cassette configured to perform recording and reproduction while supporting a magnetic tape wound around a pair of reels in a cassette case so as to be able to run is often used. ing.

[0003] Of these magnetic tape cassettes, VH
Magnetic tape cassettes used for S-system, β-system, and video equipment such as 8 mm video, rotate a pair of magnetic tape reels around which a magnetic tape is wound in a lower cassette half integrally formed of synthetic resin such as ABS resin. It is held freely. The magnetic tape reel is configured to be pressed downward by the leaf spring attached to the upper cassette half.

FIGS. 6 and 7 are a plan view showing an inner surface of an upper cassette half and a perspective view of a leaf spring in a VHS type magnetic tape cassette. The leaf spring 60 extends symmetrically from the center fixed portion 61 as shown in FIG.
Further, it is a metal plate-like member having an arm 62 which is appropriately curved and protrudes. As shown in FIG. 6, the leaf spring 60 allows a projection 64 provided at the center of the inner wall surface of the upper cassette half 2 to pass through a hole 63 formed in the fixing portion 61, and the top of the projection 64 is subjected to ultrasonic welding. By melting, the arm 62 is fixed so as to project inward (downward) of the cassette.

Therefore, when the cassette is assembled, the fixing portion 61 of the leaf 60 is moved to the upper cassette half 2.
, And both end portions of the arm 62 press the center portions of the upper end surfaces of the pair of magnetic tape reels downward of the cassette.

[0006]

When such a magnetic tape cassette is inserted into a recording / reproducing apparatus as shown in FIG. 8, the reel drive shaft 40 of the apparatus is fitted with the magnetic tape reel 3 and the magnetic tape reel is inserted. Lift the lower end of 3. At this time, since both ends of the arm 62 of the leaf spring 60 press the magnetic tape reel 3 obliquely as shown by the arrow B, the rotation of the magnetic tape reel 3 during running of the magnetic tape is poor, and the magnetic tape May have an effect on the take-up and unwinding. As a result, the magnetic tape cassette causes a defect or failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic tape cassette having a leaf spring capable of securing the rotation stability of a magnetic tape reel during running of the magnetic tape.

[0008]

An object of the present invention is to accommodate a pair of magnetic tape reels for winding a magnetic tape in a cassette case composed of upper and lower cassette halves, and press the magnetic tape reel downwardly of the cassette. In a magnetic tape cassette having a leaf spring in the upper cassette half, when the reel drive shaft of the recording / reproducing device is fitted to the magnetic tape reel and the magnetic tape reel is rotatable, the leaf spring is This is achieved by a magnetic tape cassette having a shape capable of pressing the magnetic tape reel in a vertical direction.

According to the present invention, when the magnetic tape cassette is inserted into the recording / reproducing apparatus and the reel drive shaft is fitted to the magnetic tape reel and the magnetic tape reel is in a rotatable state, the magnetic tape can be rotated. When the leaf spring provided on the tape cassette presses the magnetic tape reel in the vertical direction, the magnetic tape reel is stably held without the magnetic tape reel being inclined with respect to the reel drive shaft. Therefore, the rotation stability of the magnetic tape reel during running of the magnetic tape can be ensured, and the winding and unwinding of the magnetic tape can be performed smoothly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The same components as those in the related art will be described with the same reference numerals. 1 and 2
FIG. 2 is a plan view showing an inner surface of an upper cassette half in a VHS type magnetic tape cassette and a perspective view of a leaf spring.

As in the prior art, the leaf spring 20 is a metal plate-like member having arms 22 extending symmetrically from the center fixing portion 21 and extending appropriately curved as shown in FIG. As shown in FIG. 1, the leaf spring 20 allows a projection 23 provided at the center of the inner wall surface of the upper cassette half 2 to pass through a hole 23 formed in the fixing portion 21, and the top of the projection 24 is subjected to ultrasonic welding. The arm 22 is fixed so as to protrude inward (downward) of the cassette by melting.

In a state where the cassette is assembled, the fixing portion 21 of the leaf 20 is fixed to the center of the upper cassette half 2, and pressing surfaces 25 provided at both ends of the arm 22.
Presses the central portion of the upper end surfaces of the pair of magnetic tape reels 3 downward of the cassette.

FIG. 3 is a partial sectional view of the magnetic tape cassette according to one embodiment of the present invention in an unused state. As shown in FIG. 3, when the magnetic tape cassette 1 is not used, the pressing surface 25 of the leaf spring 20 presses the magnetic tape reel 3 from a slightly oblique direction.

FIG. 4 shows a use state of the magnetic tape cassette according to one embodiment of the present invention. As shown in FIG. 4, when the magnetic tape cassette 1 is inserted into the recording / reproducing apparatus, the reel drive shaft 40 of the apparatus fits on the magnetic tape reel 3 and raises the lower end of the magnetic tape reel 3. As a result, a gap is formed between the magnetic tape reel 3 and the lower cassette half 5. At this time, the pressing surface 25, which is the tip of the arm 22, presses the magnetic tape reel 3 from the vertical direction as shown by the arrow A. As a result, the magnetic tape reel 3 is stably held without the magnetic tape reel 3 being inclined with respect to the reel drive shaft 40. Therefore, the rotation stability of the magnetic tape reel 3 during running of the magnetic tape can be ensured, and the winding of the magnetic tape can be smoothly performed.

The bending ratio of the tip of the leaf spring and the angle of attachment of the leaf spring to the upper cassette half are properly set in consideration of the amount of lifting of the reel by the reel drive shaft. Further, the leaf spring is not limited to the above-described shape, and can be appropriately changed. For example, as shown in FIG. 5, a leaf spring 30 made of a single curved plate can be used. In this case, the pressing surface 32 vertically presses the magnetic tape reel when the magnetic tape runs.

[0016]

As described above, according to the magnetic tape cassette of the present invention, when the reel drive shaft of the recording / reproducing apparatus is fitted to the magnetic tape reel and the magnetic tape reel is rotatable, the leaf spring is provided. Is shaped so that the magnetic tape reel can be pressed in the vertical direction, so that the magnetic tape reel can be stably held and rotation stability of the magnetic tape reel can be secured. Picking can be done smoothly. Therefore, it is possible to prevent the magnetic tape cassette from being defective or out of order.

[Brief description of the drawings]

FIG. 1 is a plan view showing an inner wall surface of an upper cassette half according to an embodiment of the present invention.

FIG. 2 is a perspective view of a leaf spring according to an embodiment of the present invention.

FIG. 3 is a partial sectional view of the magnetic tape cassette according to the embodiment of the present invention in an unused state.

FIG. 4 is a partial cross-sectional view when the magnetic tape cassette according to the embodiment of the present invention is used.

FIG. 5 is a perspective view of a leaf spring according to another embodiment of the present invention.

FIG. 6 is a plan view showing an inner wall surface of a conventional upper cassette half.

FIG. 7 is a perspective view of the conventional leaf spring shown in FIG.

FIG. 8 is a partial cross-sectional view when a conventional magnetic tape cassette is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape cassette 2 Upper cassette half 3 Magnetic tape reel 5 Lower cassette half 20 Leaf spring 21 Fixed part 22 Arm 23 Hole 24 Projection 25 Pressing surface 30 Leaf spring 32 Pressing surface 40 Reel drive shaft 60 Leaf spring 61 Fixed part 62 Arm 63 Hole 64 Projection

Claims (1)

[Claims] 1. A magnetic tape comprising: a pair of magnetic tape reels for winding a magnetic tape in a cassette case comprising upper and lower cassette halves; and a leaf spring for pressing the magnetic tape reels below the cassette in the upper cassette half. In the cassette, when the reel drive shaft of the recording / reproducing device is fitted to the magnetic tape reel and the magnetic tape reel is rotatable, the leaf spring can press the magnetic tape reel in a vertical direction. Magnetic tape cassette characterized by having a special shape.