JPH09102182A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake member for increasing a mechanical strength and dimension accuracy by extending the side wall part the brake member to the position of the side wall inner side of a lid, making a brake arm short and difficult to be deformed. SOLUTION: A brake member 4 for preventing the rotation of a hub and a lid 5 for opening/closing a cassette front end part are provided in a cassette. The brake member 4 is provided with a vertically provided side wall part 10 and a brake arm 11 extended to the front end part of the cassette in both ends of a brake body 9 having a brake pawl 8. The side wall part 10 is extended to the position of the inner wall 16b of the side wall 16 of the lid 5 under the open condition of the lid 5 and provided with an opening hole 12 for causing the tape end detecting hole of a cassette wall surface to face outward. Thus, the brake arm 11 is made short and prevented from being deformed and interference with tape end detection is prevented.

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 brake member having high mechanical strength and dimensional accuracy of a brake arm portion of a brake member.

[0002]

2. Description of the Related Art Generally, a tape cassette, as shown in FIG. 7, has a pair of hubs 103 in which a magnetic tape 102 is wound in a cassette body composed of an upper half and a lower half 101 (the upper half is not shown). Brake member 104 for housing 103 and preventing rotation of the hubs 103, 103
Is provided slidably in the front-rear direction of the cassette along the inner wall surface of the upper half, and when the magnetic tape 102 is not running, the brake member 104 prevents the hubs 103, 103 from rotating by a brake spring (not shown). It is designed to be urged in the direction (the direction of arrow X _{1 in the} figure).

As shown in FIG. 8, the brake member 104 includes a brake main body 106 having a pair of brake claws 105, 105 which engage with the hubs 103, 103, respectively.
The brake main body 106 includes side wall portions 107 and 107 that are vertically provided on both ends of the brake main body 106, and brake arms 108 and 108 that extend from the side wall portions 107 and 107 toward the front end side of the cassette main body.

The brake pawls 105, 105 engage with the gear portions 109, 109 provided on the hubs 103, 103 when the magnetic tape is not running, so that the hubs 103,
The rotation of 103 is prevented. Further, front end bulging portions 110, 110 with which engaging protrusions provided on a lid (not shown) that opens and closes the front end portion of the cassette main body are provided at the front end portions of the brake arms 108, 108.

The brake member 104 slides in conjunction with the opening operation of the lid. That is, when the lid is rotated in the direction to open the front end of the cassette body, the engagement protrusion provided on the lid engages with the tip bulging portions 110, 110, and is interlocked with the opening operation of the lid. Then, the brake member 104 is slid in the arrow X ₂ direction in FIG. 7 against the biasing force of the brake spring. As a result, the engagement between the brake claws 105, 105 and the gear parts 109, 109 is released, and the hub 1
03 and 103 can be rotated.

On the other hand, when the lid rotates in the direction of closing the front end of the cassette body, the brake spring pulls the brake member 104 back in the direction of arrow X ₁ in FIG. When the engagement protrusion of the lid and the tip bulging portions 110, 110 of the brake member 104 are released, the brake claws 105, 105 move to the gear portion 109,
109 to prevent rotation of the hubs 103, 103.

[0007]

The above-mentioned brake member 10
4 is usually formed by injection molding using a mold. However, since the brake arms 108, 108 are formed as elongated arms, the brake arms 108, 108 are easily bent and deformed during molding. Therefore, the dimensional accuracy of the brake member 104 deteriorates.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape cassette provided with a brake member having a high mechanical strength and high dimensional accuracy in which the brake arm portion is unlikely to be deformed during molding.

[0009]

According to the first aspect of the present invention,
A brake member that prevents rotation of the hub is slidably provided in a cassette body that houses a pair of hubs around which magnetic tape is wound, and a lid that opens and closes the front end portion is rotated at the front end portion of the cassette body. In a tape cassette configured to be slidably provided on the lower surface of the cassette body, the slider closing the opening provided on the lower surface is slidable, and the brake member is a pair that engages with each hub. The side walls of the brake main body having the broom claws, which are vertically provided on both edges of the brake main body, and the brake arm extending from the side walls to the front end side of the cassette main body. An opening hole that extends to the inner wall position of the side wall of the lid and opens the tape end detection hole provided on the side wall surface of the cassette body to the outside in the open state of By providing a tape cassette, characterized in that it has, is obtained by achieving the above object.

According to a second aspect of the present invention, the tape cassette according to the first aspect is characterized in that, in the closed state of the lid, the side wall portion is provided with a protrusion that is close to the side wall of the lid. Is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the tape cassette of the present invention will be described below with reference to the drawings. 1 is a perspective view of the tape cassette according to the present embodiment, FIG. 2 is a plan view showing a state in which the upper half of the tape cassette according to the present embodiment is removed, and FIG. 3 is a view of a brake member provided in the tape cassette according to the present embodiment. 4 is an enlarged perspective view of FIG.
5 is a cross-sectional view of a main part of the tape cassette in the lid closed state in the present embodiment, FIG. 5 is a cross-sectional view of a main part of the tape cassette in the lid open state in the present embodiment, and FIG. It is a principal part top view which shows the state which removed the upper half.

As shown in FIGS. 1 and 2, the tape cassette of the present embodiment has a hub 2 and a hub 2 which are housed in a cassette body 3 in which a pair of hubs 2 and 2 around which a magnetic tape 1 is wound are housed.
Is provided slidably, a lid 5 for opening and closing the front end of the cassette main body 3 is rotatably provided, and a brake member 4 for preventing the rotation of the cassette main body 3 is provided on the lower surface and the lower surface of the cassette main body 3. The tape cassette is configured so that a slider 7 for closing the formed opening 6 is slidably provided.

The brake member 4 includes the hubs 2 and 2 described above.
Side wall portions 10 and 10 provided vertically on both end edges of the brake main body portion 9 having a pair of broom claws 8 and 8 that engage with
Brake arms 11, 11 are provided extending from the side wall portions 10, 10 to the front end side of the cassette body.

The tape cassette of this embodiment will be described in more detail. The cassette body 3 in this tape cassette has a rectangular upper half 1 that is large enough to accommodate a pair of hubs 2 and 2 and a brake member 4 therein.
3 and the lower half 14 are abutted against each other. And, on the front end side of the cassette body 3,
A lid 5 for opening and closing an opening 6 into which the rotary drum provided in the cassette body 3 is inserted is provided.

The lid 5 serves to protect the magnetic tape 1 running toward the front end of the cassette body 3 from inadvertent external force and to prevent dust from adhering to the magnetic tape 1. The front lid 15 is provided so as to cover the magnetic tape 1, and the side walls 16 and 16 are provided at both end edges of the front lid 15 in the longitudinal direction.

The front lid 15 is formed as a rectangular plate-like member that completely closes the front surface of the cassette body 3, and has slider open / close notches 17 and 17 and a slider lock release notch 18 at its lower edge. , 18 are included. The slider opening / closing notches 17 and 17 have the slider 7
A slider opening / closing member provided on the side of the drive device for sliding operation is exposed.

On the other hand, the slider lock release notches 18 and 1
8 is a slider lock claw 1 provided on the lower half 14.
A slider lock releasing member provided in the drive device for releasing the lock of the sliders 9 and 19 is exposed. Then, the side walls 16 and 1
A rotation shaft (not shown) is provided at 6 for allowing the lid 5 to rotate with respect to the cassette body 3.

The slider 7 closes a hub hole (not shown) formed on the lower surface of the opening 6 and the lower half 14 to prevent dust and the like from entering the cassette body 3. It is provided slidably in the front-back direction of the cassette body 3. Further, the slider 7 is formed with circular holes 20 and 20 for exposing the hub hole to the outside at the open position where the opening 6 is opened.

The slider 7 has a substantially U shape with both ends vertically bent, and is always attached to the front end side of the cassette body 3 by a slider spring (not shown) provided in the cassette body 3. It is designed to be energized. When the opening 6 of the cassette body 3 is closed, the slider lock pawls 19, 19 protruding from the lower half 14 make the slider 7 non-slideable.

As shown in FIG. 3, the brake member 4 has a brake main body 9 with brake pawls 8 and 8 which engage with the gear portions 21 and 21 formed on the hubs 2 and 2, respectively. . The buch pawls 8 and 8 engage the gear portions 21 and 21 when the magnetic tape is not running to prevent the hubs 2 and 2 from rotating. Further, tip end bulging portions 23, 23 with which the engaging protrusions 22, 22 provided on the side walls 16, 16 of the lid 5 engage are provided at the tip ends of the brake arms 11, 11 of the brake member 4. Has been.

As shown in FIG. 5, when the lid 5 rotates in a direction in which the front end of the cassette body 3 is opened, the brake member 4 engages with the engaging projection 2 provided on the lid 5.
2, 22 are engaged with the front end bulging portions 23, 23, and are interlocked with the opening operation of the lid 5, and slide toward the front end portion of the cassette body 3 against the biasing force of the brake spring. Be punished. As a result, the broom claws 8, 8 and the gear portion 2 are
The engagement with the wheels 1 and 21 is released, and the hubs 2 and 2 are rotatable.

On the other hand, as shown in FIG. 4, when the lid 5 rotates in the direction to close the front end of the cassette body 3, the brake spring causes the brake member 4 to move in the direction in which the hubs 2 and 2 are provided. Be pulled back. Then, the engaging projections 22 and 22 of the lid 5 and the brake member 4
When the engagement with the front end bulging portions 23, 23 is released, the buckle claws 8, 8 engage with the gear portions 21, 21 to prevent the hubs 2, 2 from rotating. That is, the rotation of the hubs 2 and 2 is locked.

In the tape cassette thus constructed, when the tape cassette is mounted on the drive device, the lock claws 19 and 19 are pushed into the cassette body 3 by the slider lock release member provided on the drive device, and the slider is released. 7 is unlocked. Then, the slider opening / closing member provided on the drive device side abuts on the front end edge of the slider 7, and slides the slider 7 to the side opposite to the front end portion of the cassette body 3 against the biasing force of the slider spring. Then, when the slider 7 is in the slide completed state, the lid 5 becomes rotatable, and the lid 5 is rotated by the mechanism on the drive device side.

When the slider 7 is in the closed state,
The side walls 16, 16 of the lid 5 come into contact with the slider 7 so that the lid 5 cannot rotate. That is, in the closed state of the slider 7, the lid 5 cannot be carelessly rotated unless the slider 7 is retracted.

The above-mentioned structure is similar to the conventional product of this type.

Thus, in the tape cassette of this embodiment, the brake main body 9 and the brake arm 11,
As shown in FIG. 3, the side wall portions 10 and 10 for connecting 11 are provided so as to extend to the positions of the inner walls 16b and 16b of the side walls 16 and 16 of the lid 5 in the open state of the lid 5. . That is, the side wall portions 10 and 10 are provided not only on the connecting portion between the brake main body portion 9 and the brake arms 11 and 11, but also on the side wall portions 16 and 16 of the lid 5 in the open state shown in FIG. The inner walls 16b, 16b are formed so as not to contact the rotating shaft (not shown).

From the opposite viewpoint, the side wall portions 10 and 10 are
Is provided up to the position of the inner walls 16b, 16b of the side walls 16, 16 of the lid 5, the brake arm 1
The elongated arms of 1 and 11 are much shorter than the conventional ones. Therefore, the side walls 10 and 10 provided so as to extend extend from the brake arms 11 and 1.
1 functions as a reinforcing portion that enhances the mechanical strength. Therefore, when the brake member 4 is formed by injection molding, the brake arms 11 and 11 are prevented from being deformed during molding, and the brake member 4 having excellent dimensional accuracy can be obtained.

Further, as shown in FIGS. 5 and 6, the side wall portions 10 and 10 are provided with tape end detection holes 24 provided on the side wall surface of the cassette main body under the open state of the lid 5. An opening hole 12 is formed to face the above. By providing the opening hole 12 in the side wall portions 10 and 10, the light of the detection means for detecting the tape end is not blocked and enters the light receiving portion provided outside the cassette body 3 through the opening hole 12. Will be done.

Further, the side wall portions 10 and 10 are provided with the lid 5 under the closed state of the lid 5 shown in FIGS. 4 and 6.
A protrusion 25 for preventing rattling is provided at a position close to the side wall 16 of the lid 5. That is, the protrusion 25 is configured such that when the lid 5 is closed,
To the position facing the rear edge 16a of the side walls 16, 16 of
It is formed as a protrusion protruding from the side wall portions 10, 10. Therefore, the protrusion 25 prevents rattling of the lid 5 in the closed state.

As described above, according to the tape cassette of this embodiment, when the lid 5 is in the open state, the side wall portions 10, 10 of the brake member 4 are connected to the inner wall 16 of the side wall of the lid 5.
Since it is provided so as to extend to the positions b and 16b, the brake arms 11, 11 having thin arms are short, and deformation during molding of the brake arms 11, 11 is eliminated. In addition, since the extended side wall portions 10 and 10 are formed with the opening hole 12 that exposes the tape end detection hole 24 to the outside when the lid 5 is in the opened state, the detection at the time of detecting the tape end is performed. There is nothing to prevent.

The tape cassette of the present invention is not limited to the above-mentioned embodiment, and can be appropriately modified without departing from the gist of the present invention. The shape of the side wall portions 10 and 10 is not particularly limited as long as the mechanical strength of the brake arms 11 and 11 is secured. Further, the shape of the protrusion 25 is not particularly limited.

[0032]

According to the tape cassette of the present invention, it is possible to provide a tape cassette provided with a brake member having high mechanical strength and high dimensional accuracy in which the brake arm portion is unlikely to deform during molding. Also, on this side wall,
In the opened state of the lid, the tape end detection hole provided on the side wall surface of the cassette main body has an opening hole facing the outside, so that the detection at the tape end detection is not hindered. Further, in the closed state of the lid, since the side wall of the brake member is provided with the protrusion that is close to the side wall of the lid, rattling of the lid can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tape cassette of the present invention.

FIG. 2 is a plan view showing a state in which the upper half of the tape cassette of the present invention is removed.

FIG. 3 is an enlarged perspective view of an essential part of a brake member provided in the tape cassette of the present invention.

FIG. 4 is a cross-sectional view of essential parts of the tape cassette of the present invention in a lid closed state.

FIG. 5 is a cross-sectional view of the main parts of the tape cassette of the present invention when the lid is open.

FIG. 6 is a plan view of relevant parts showing a state in which the upper half is removed in the opened state of the lid of the tape cassette of the present invention.

FIG. 7 is a plan view of relevant parts showing a state in which an upper half of a conventional tape cassette is removed.

FIG. 8 is a perspective view of a brake member in a conventional tape cassette.

[Explanation of symbols]

 3 Cassette Body 4 Brake Member 5 Lid 7 Slider 8 Booky Claw 9 Brake Body 10 Sidewall 11 Brake Arm 12 Opening Hole 16 Sidewall 25 Projection

Claims (2)

[Claims] 1. A brake member for preventing rotation of the hub is slidably provided in a cassette main body accommodating a pair of hubs around which a magnetic tape is wound, and the front end of the cassette main body is opened and closed. In the tape cassette, the lid is rotatably provided, and a slider for closing an opening provided in the lower surface of the cassette body is slidably provided on the lower surface of the cassette body. A side wall portion provided vertically to both end edges of a brake main body portion having a pair of bucky pawls engaged with the brake main body portion, and a brake arm extending from the side wall portion toward a front end side of the cassette main body; The portion is provided so as to extend to the inner wall position of the side wall of the lid under the opened state of the lid, and the tape end detection hole provided on the side wall surface of the cassette main body is outwardly provided. Tape cassette, characterized in that it has an Maseru opening hole. 2. The tape cassette according to claim 1, wherein the side wall portion is provided with a protrusion that is close to the side wall of the lid when the lid is closed.