JPS6312455Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a rotating lid that covers and protects the tape stretched on the front surface, such as a tape cassette used in a video tape recorder, and that rotates and releases it as necessary.
and a tape cassette having a lid locking means which normally prevents rotation of the rotating lid.

Conventionally, as shown in FIG. 1, for example, a tape cassette 1 used in a video tape recorder (VTR) has a tape 2 (indicated by a two-dot chain line) stretched on the front surface of the tape cassette 1, which has a tape 2 (indicated by a two-dot chain line) centered around a shaft 3a to cover and protect the tape cassette 1. A rotating lid 3 is provided. And this rotating lid 3
Normally, rotation is prevented by a lid lock piece 4, as shown in an exploded perspective view in FIG. When the tape cassette 1 is inserted into the cassette garage (not shown) of a VTR, the protrusion 5 of the lid lock piece 4 is pushed in the direction of arrow 6 by a release member (not shown) attached to the cassette garage. The engagement between the recess provided on the inner surface of the lid 3 and the lock pawl 7 provided on the lock piece 4, which is shown in FIG. 3 in a lock engagement relationship, is released as shown in FIG.
This allows the lid 4 to rotate in this direction.

The operation of the lid locking piece 4 will be further explained with reference to FIG. The lock piece 4 has a shaft 11 inserted into a recess 10 of the lower half 9 and is rotatably held, is biased in the direction of arrow 13 by a spring 12, and is in contact with the inner side of the wall 14 of the lower half 9. Also wall 1
The protrusion 5 and the lock pawl 7 of the lid lock piece 4 pass through the holes 15 and 16 of the lid lock piece 4, respectively. and arrow 6
When a release member (not shown) enters in the direction, the convex portion 5
is pressed, the lid lock piece 4 rotates by an amount L in the direction of arrow 17 as shown by the dashed line, and has already been rotated in the direction shown in FIGS.
The engagement between the lid 3 and the lock pawl 7 explained using the drawings is released.

In the conventional lid locking means as described above, the direction of the unlocking operation is the longitudinal direction of the tape cassette and, as shown diagrammatically in FIG. 5, the length l required to form the lid locking means is large and this is effective for relatively large tape cassettes. However, when considering extremely small tape cassettes, the opening length k of the opening 17 into which the post (not shown) is inserted when pulling out the tape 2 becomes small, causing the inconvenience of making it difficult to pull out the tape 2 and making this inapplicable.

In view of the above problems, the present invention proposes a lid locking means that can be applied to extremely small tape cassettes.

That is, a rotating lid that covers the front surface of the tape cassette to protect the tape stretched over the front surface of the tape cassette, two side walls separated from each other, and an extension between the side walls and one of the side walls and the front surface of the tape cassette. A groove is formed by arranging the inner surfaces of the side plates of the rotating lid in a direction perpendicular to the longitudinal direction of the tape being stretched, and the lock is released from the front of the tape cassette into the groove. In order to allow the member to enter, there is a notch provided at the lower front of the rotating lid corresponding to the groove position, and a notch that is pivoted on the side wall and rotates in the thickness direction of the tape cassette within the groove. It has an end that engages with the lid and a release end that faces the front of the tape cassette through the notch, and usually engages with the end of the engagement lid to prevent its rotation and prevents the cutting. The lock release member that passes through the notch and the groove and enters from the front of the tape cassette rotates by moving the release end into contact with the lid lock, which releases the engagement with the rotating lid and allows the rotation. and a biasing spring that biases the lid lock into engagement with the rotating lid.

Hereinafter, the present invention will be explained in detail using embodiments.

FIG. 6 shows an embodiment according to the present invention, and shows a state in which a tape cassette 18 is inserted into a cassette garage 19 (for ease of understanding, the top plate provided at the top, etc., is shown as a broken section). The rotating lid 21 that covers and protects the tape 20 (indicated by two-dot chain lines) stretched on the front surface of the tape cassette 18 has projections 22, 23, and 24 cut out on the cassette garage 19. Notches 25, 26, 27 are provided, and the protrusion 2
3 and 24 are for positioning the tape cassette 18 in the cassette garage 19 in the insertion direction 28, and the protrusion 22 corresponds to the lock release member of the lid lock according to the present invention, and at the same time, it is used to release the cassette as will be described later. This constitutes an erroneous insertion prevention member that restricts the insertion direction of the tape cassette 18 into the garage 19.

Next, the lid locking means will be explained in detail with reference to FIG. 7 which is a partially exploded perspective view, FIG. 8 which is a schematic side view, and FIG. 9 which is a plan view. 7 shows the lower half 28 of the tape cassette 18, excluding the upper half.

In FIGS. 7 and 8, the lid lock 29 is rotatably held by a shaft 31 in a recess 30 provided in two mutually separated side walls of the lower half 28, and a protrusion 32 is provided between the side walls. The inner surface of the side plate of the rotating lid 21, which is perpendicular to the longitudinal direction of the tape 20 (indicated by the two-dot chain line) stretched over the extension of one side wall and the front surface, that is, the surface on which the protrusion 35 is provided. By arranging them apart from each other, a groove is formed at a position corresponding to the notch 25 into which the unlocking member of the protrusion 22 described above enters (the groove schematically shown in section m in FIG. 9). The tape cassette rotates in the thickness direction plane.

Then, set the rotation position to the protrusion 32 of the lower half 28.
While being regulated by a plate spring 34 attached to the wall 33, it is urged to rotate in the direction of the arrow in the figure.

Further, a protrusion 35 provided on the inner surface of the rotating lid 21 and an engaging end 36 of the lid lock 29 engage with each other to prevent the rotating lid 21 from rotating in the direction of arrow 37 about the shaft 21a. When the tape cassette 18 is inserted into the cassette garage 19, the protrusion 22 of the cassette garage 19 passes through the notch 25.
The tape cassette 1 enters the groove described above, is part of the lid lock 29, and passes through the notch 25.
8 (the end opposite to the engaging end 36 via the shaft portion 31 of the lid lock 29 in FIG. 7), and is rotated against the leaf spring 34. Lid 2
This is to release the engagement between the protrusion 35 of No. 1 and the engagement end 36 of the lid lock 29.

Here, the entry path of the protrusion 22 formed by the notch 25 and the groove located at the corresponding position and provided with the lid lock 29 is formed by the external shape of the tape cassette 18, as shown in FIGS. 6 and 9. It is formed geometrically asymmetrically.
When the tape cassette 18 is inserted into the cassette garage 19 in the normal insertion direction 28 shown in FIG. However, in other cases, for example, when the tape cassette 18 is inserted into the cassette garage 19 with the tape cassette 18 turned front to back or upside down, the outer shape of the tape cassette 18 and the protrusion 22 will come into contact with each other, preventing further insertion. This is to prevent That is, in this case, the protrusion 22 functions as a member to prevent incorrect insertion, and the entry path of the protrusion 22 formed by the notch and groove also provides the tape cassette 18 with a shape that prevents incorrect insertion into the cassette garage. be.

Further, the release of the rotating lid 21 shown by the two-dot chain line in FIG. Cassette holder 19 in condition
As the lid is pushed down and attached to the main unit (not shown), for example, a lid opening member (not shown) provided on the main unit side and relatively raised pushes up the lower end of the rotating lid 21. It is done.
At this time, the lid opening member can enter into the bottom surface of the tape cassette 18 by an amount slightly smaller than the thickness of the side plate of the rotating lid 21 on which the protrusion 35 is provided and the width of the groove, resulting in a small size. The tape cassette 18 also allows a reliable opening operation while providing sufficient dimensional margin in the longitudinal direction of the tape cassette 18.

Although not shown, the rotating lid 21 is biased to rotate in the direction opposite to the arrow 37, and is powered by a spring stronger than the plate spring 34 (for example, a torsion coil spring is inserted into the shaft 21a of the rotating lid 21). (also good) is applied. As a result, the tape cassette 18 is taken out from the cassette garage 19 and the engagement between the protrusion 22 and the lid lock 29 is released. It will become locked again.

As described above, according to the present invention, there are two side walls separated from each other, and an extension of one side wall and an inner surface of the side plate of the rotating lid that is perpendicular to the longitudinal direction of the tape stretched on the front surface. The lid lock is rotated in the plane in the thickness direction of the tape cassette within the groove formed by arranging the tape cassettes at a distance from each other, and a lock is provided at the bottom of the front surface of the rotary lid at a position corresponding to the groove. By providing the entrance path of the lock release member (misinsertion prevention member) formed by the notch part in a geometrically asymmetrical shape with respect to the external shape of the tape cassette, the required rotation of the front surface of the tape cassette can be prevented. Various functions such as locking the lid and preventing erroneous insertion when opening the rotating lid can be added in an extremely compact manner, and the length of the lid locking means in the longitudinal direction of the tape cassette can be added as shown schematically in Fig. 9. m can be configured to be extremely small, and in order to draw out the tape 2 stretched on the front surface even in an extremely miniaturized tape cassette, a post (not shown) is inserted and the length n of the moving opening 38 is This allows for a large tape cassette to be formed into a compact size.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional tape cassette;
Figure 2 is an exploded perspective view of the main parts, Figures 3 and 4.
5 is a plan view showing an outline of a conventional tape cassette; FIG. 6 is a perspective view of a tape cassette according to an embodiment of the present invention;
FIG. 7 is an exploded perspective view of the same essential parts, FIG. 8 is a side view for explaining the same operation, and FIG. 9 is a plan view showing an outline of the tape cassette. 21... Rotating lid, 29... Lid lock, 35...
Projection, 36...engaging end.

Claims (1)

[Utility Model Claims] (1) A tape cassette comprising a rotating cover that covers the front surface of the tape cassette to protect the tape stretched over the front surface of the tape cassette, two side walls that are spaced apart from each other, and an extension between the side walls and one of the side walls and in the longitudinal direction of the tape stretched over the front surface of the tape cassette.
a groove formed by arranging the inner surfaces of the side plates of the pivot lid in a vertical direction and spaced apart from each other; a notch provided in the lower front surface of the pivot lid corresponding to the position of the groove to allow an unlocking member to enter the groove from the front surface of the tape cassette; and a release end pivotally supported by the side wall and pivoting within the groove in the thickness direction of the tape cassette, having an engagement end with the pivot lid and a release end facing the front surface of the tape cassette via the notch, and normally engaging with the pivot lid at the engagement end to prevent its rotation, passing through the notch and the groove;
The tape cassette according to claim 1, further comprising a lock release member that is adapted to move the lock release member from the front side of the tape cassette and rotate to release the lock release member from engagement with the pivotable lid and to permit the lock release member to rotate, and a biasing spring that biases the lock release member to engage with the pivotable lid. (2) The tape cassette according to claim 1, further comprising a lock release member that is adapted to move the lock release member from the front side of the tape cassette and rotate to release the lock release member from engagement with the pivotable lid.