JPH0726975U - Magnetic tape cassette and cassette case - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a magnetic tape cassette and a cassette case that prevent loosening of the tape due to looseness between the hub and the rotation preventing projection and prevent damage to the hub due to damage to the rotation preventing projection. [Structure] A pair of hubs 4 is provided with a concavo-convex portion 15 transferred to the upper and lower end surfaces 7 in a circumferential shape, and the concavo-convex portion 15 is engaged at a position facing the concavo-convex portion 15 to prevent rotation of the hub 4. A magnetic tape cassette 17 provided with an elastic stopper 8. A lid 20 having a pocket 19 for accommodating the magnetic tape cassette 17 and a pusher 24 for opening and closing the lid 20 and pressing an elastic stopper 8 engaged with the uneven portion 15 of the hub 4 are provided as a case. A cassette case 18 provided in the main body 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette and a cassette case, and more particularly, to a magnetic tape cassette used for audio and the like and a cassette case for accommodating the cassette provided with a rotation stopping mechanism of a hub around which the magnetic tape is wound.

[0002]

[Prior art]

 As shown in FIG. 7, a magnetic tape cassette conventionally used for audio or the like has two upper and lower friction sheets inside an upper cassette half 50 and a lower cassette half 51 integrally molded with a synthetic resin as well known. A pair of hubs 54 wound with a magnetic tape 53 are sandwiched via 52 to be rotatably accommodated corresponding to the hub holes 59. Is configured to move in a direction. The hub 54 is positioned by engaging the circular concave portion 57 of the hub with the circular convex portion 58 that constitutes the hub hole 59 and projects inward of the cassette. Further, other components mounted in the cassette are not shown for convenience.

In the magnetic tape cassette 60, when the cassette is stored, dust may enter from the front opening 56 of the cassette or the magnetic tape 53 may sag due to the rotation of the hub 54. For the purpose of preventing the above problem and protecting the magnetic tape cassette 60, a cassette case 61 as shown in FIG. 8 is used. The cassette case 61 has a lid 63 having a pocket 62 into which the magnetic tape cassette 60 is inserted, and a rotation preventing member that is inserted into the hub hole 59 and locks the hub claw 55 provided on the hub 54. The case main body 65 having the protrusion 64 can be opened and closed. That is, when the cassette is stored, a part of the magnetic tape cassette 60 is put in the pocket 62 of the lid 63, and the case body 65 and the lid 63 are closed so that the bottom of the case body 65 is projected. The anti-rotation protrusion 64 provided enters the hub 54 and is inserted between the hub claws 55. The anti-rotation projection 64 is generally composed of a locking portion 67 and an auxiliary portion 68 orthogonal to the locking portion 67, and the locking portion 67 engages with the hub claw 55 to cause the magnetic force to increase. Prevent the slack of the tape 53.

[0004]

[Problems to be solved by the device]

 However, in the above-described magnetic tape cassette and cassette case, if the magnetic tape cassette 60 is stored in the cassette case 61, tape loosening is prevented, but the hub claw 55 and the rotation There is a play between the prevention projection 64 and the rotation prevention projection 64 collides with the hub claw 55 when the cassette case 61 is dropped while the cassette is stored. Therefore, the hub claw 55 may be bent or broken. As a result, not only is the magnetic tape loosened, but the hub claw 55 is an important part that fits with the rotating shaft for rotating the hub of the recording / reproducing apparatus. If this part is seriously damaged, the magnetic tape cassette 6 is used. There was a problem that 0 became unusable. Further, since the rotation preventing projection 64 has a relatively complicated shape as described above, it is a factor that complicates the molding die of the cassette case. Further, the hub hole 59 of the magnetic tape cassette 60 is located slightly closer to the rear side of the cassette in the front-rear direction of the cassette, and when the magnetic tape cassette is inserted upside down, the rotation preventing projection is not stored in the hub hole. I couldn't. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic tape cassette and a case for a cassette, which can not only prevent damage due to dropping and slack of the magnetic tape, but also prevent damage to the hub claws. It is intended.

[0005]

[Means for Solving the Problems]

 The above object of the present invention is to rotatably store a pair of hubs, around which magnetic tapes are wound, between a pair of upper and lower friction sheets in a cassette case consisting of a pair of upper and lower cassette halves. In the tape cassette, the hub has upper and lower end surfaces provided with a concavo-convex portion which is continuous along the circumferential direction of the end surface, and the upper and lower cassette halves can be engaged with the concave portion at positions corresponding to the concavo-convex portion. An elastic stopper that has a different stopper pin and is elastically deformable inside the cassette when pressed from the outside of the cassette is provided.By pressing the elastic stopper, the stopper pin engages with the uneven portion and the hub Can be achieved by a magnetic tape cassette characterized in that it is arranged to prevent rotation of the. Further, the concave convex portion is a concave and convex portion having a ridge line extending radially outward from the hub center, and at least the upper side cross-sectional shape of the concave portion can be configured as an inclined guide structure.

The above object of the present invention is to rotatably accommodate a pair of hubs wound with a magnetic tape between a pair of upper and lower friction sheets, inside a cassette case consisting of a pair of upper and lower cassette halves. In the magnetic tape cassette described above, the hub is provided with concavo-convex portions on the upper and lower end surfaces thereof along the circumferential direction of the end surface, and the upper and lower cassette halves are provided with concavo-convex portions at positions facing the concavo-convex portion. It can also be achieved by a magnetic tape cassette, characterized in that a pin hole is provided to allow the engagement element that engages with the portion to prevent rotation of the hub from entering. Further, in the magnetic tape cassette, the friction sheet is provided with a cutout opening at a position corresponding to the insertion / removal of the stopper pin or the engaging element so as to allow insertion of the stopper pin or the pressing element. The above object can also be achieved by a magnetic tape cassette characterized by:

The above object of the present invention is to provide a lid part having a pocket part for accommodating one end of the magnetic tape cassette, and a case for accommodating a part provided on the lid part so as to be openable and closable and not accommodated in the pocket part. A case for a cassette including a main body, wherein a pressing element that presses the elastic stopper inward of the cassette when the lid portion and the case main body are closed in a state where the magnetic tape cassette is accommodated. It can be achieved by a cassette case characterized by being provided in the.

Further, it comprises a lid portion having a pocket portion that accommodates one end of the magnetic tape cassette, and a case main body that is openably and closably provided in the lid portion and that accommodates a portion other than that accommodated in the pocket portion. A case for a cassette, which enters from a pin hole of the cassette half and engages with an uneven portion of the hub when the lid part and the case body are closed with the magnetic tape cassette accommodated therein. The above object can also be achieved by a cassette case in which an engaging element is provided in the case body. The above object of the present invention is achieved by a magnetic tape cassette in which the elastic stopper or the pin hole is provided on the center line in the front-rear direction of the cassette.

[0009]

Embodiment

 An embodiment of the magnetic tape cassette and the cassette case of the present invention will be described below. The overall structure of the magnetic tape cassette of this embodiment is shown in FIG. The magnetic tape cassette 17 shown in FIG. 2 includes a cassette case composed of upper and lower cassette halves 31 and 32 integrally formed of synthetic resin, a hub 4 around which a magnetic tape 3 is wound with a pair of upper and lower friction sheets 2 interposed therebetween, In addition, it is composed of various components not shown. The cassette case is divided into the upper cassette half 31 and the lower cassette half 32 as shown in the drawing, and a hub hole 5 into which a rotary shaft of a recording / reproducing device or the like is inserted is predetermined at a predetermined position of each cassette half. It is provided at intervals. In order to rotatably mount the hub 4 in the hub hole 5, a circular convex portion 6 is provided inside the upper and lower cassette halves 31 and 32 as in the conventional case.

Elastic stoppers 8 are provided on the upper and lower cassette halves 31 and 32 at positions corresponding to the upper and lower end surfaces 7 of the hub 4 on the left and right sides of the hub hole 5. The elastic stopper 8 is integrally formed by connecting a part of it to the half wall surface, and is formed in a one-sided supporting manner. The free end side of the elastic stopper 8 is a stopper protruding slightly in the hub direction. The pin 9 is projected. When the elastic stopper 8 is pressed from the outside of the case, the elastic stopper 8 is pushed inward and elastically deformed, and when the pressing is released, the elastic stopper 8 becomes flush with the wall surfaces of the upper cassette half 31 and the lower cassette half 32. It is composed of

The friction sheet 2 mounted on the inner surfaces of the upper and lower cassette halves 31 and 32 is a thin film sheet member made of, for example, polyethylene terephthalate, the shape of which is punched out into a substantially half shape, and the hub hole is formed. A through hole 10 corresponding to No. 5 is formed. A cutout 11 is provided adjacent to the through hole 10 at a position where the stopper pin 9 of the elastic stopper 8 moves up and down. The cut-out opening 11 is formed with, for example, a notch-shaped cut-out opening, which is opened when the stopper pin 9 is inserted and is closed when the stopper pin 9 is separated.

As shown in FIG. 3, the hub 4 on which the magnetic tape 3 is wound is an annular disc member made of synthetic resin such as polyoxymethylene, and the rotary shaft of an external device (recording / reproducing device) is inserted in the center thereof. Has a central hole 12, and a plurality of hub claws 13 are provided on the inner peripheral surface of the central hole 12 so as to engage with spline grooves of the rotary shaft. A step surface 14 that fits into the circular convex portion 6 and slides and rotates is provided outside the center hole 12, and the magnetic tape 3 is wound around the step surface 14. On both upper and lower end surfaces 7 of the cut-off surface 14, a concavo-convex portion 15 having a radial ridge line outward from the center of the hub 4 is continuously provided in a circular shape. Further, the uneven portion 15 has the ridge line structure as described above, and between the convex portions, the cross-sectional shape constituted by the guiding slanted surface cut by the slanted surface from the left and right sides has a mountain shape, and the concave portion A groove 16 is provided at the deepest position, and the tip of the stopper pin 9 is inserted into the groove 16 by pushing down the elastic stopper 8.

The magnetic tape cassette 17 configured as described above can be housed in the cassette case 18 shown in FIG. The cassette case 18 is provided with a lid portion 20 having a pocket portion 19 for accommodating one end side of the magnetic tape cassette 17 (in the present embodiment, an opening portion side in front of the cassette), and a support portion of the lid portion 20. It is composed of a case body 22 pivotally mounted via a shaft 21. A pair of pushers 24 corresponding to the elastic stoppers 8 provided on the magnetic tape cassette 17 side are provided on the wall portion 23 of the case body 22. The shape of the pressing member 24 is not particularly limited, but it may be a very simple shape, for example, a cylindrical pin member at the tip and a thicker diameter at the bottom.

When storing the cassette, the magnetic tape cassette 17 is stored in the pocket portion 19 provided in the lid portion 20 of the cassette case 18, and the case body 22 side is attached to the lid portion 20. As shown in FIG. 1 (a diagram in the middle of storage), the pusher 24 of the case main body 22 finally pushes down the elastic stopper 8 as shown by the imaginary line, and the stopper of the elastic stopper 8 is stopped. The pin 9 penetrates the incision 11 of the friction sheet 2, enters the uneven portion 15 provided on the hub 4, reaches the inside of the groove portion 16 following the inclined surface of the uneven portion 15, and completes the hub 4 completely. Can be fixed. This fixing is accurately maintained while the lock between the case body 22 and the lid 20 is maintained by, for example, the concave and convex fitting portions 33 and 34 provided on the lid side and the case body side. The looseness of the tape 6 is completely maintained.

The magnetic tape cassette of the present invention can also be constructed as shown in FIG. The magnetic tape cassette 87 shown in FIG. 5 is different from the magnetic tape cassette 17 of the above-described embodiment only in the part in which the pin hole 28 is provided at the position where the elastic stopper 8 is provided. Therefore, the other components in FIG. Further, as shown in FIG. 6, a cassette case 88 for accommodating the magnetic tape cassette 87 is provided in place of the pressing element 24 of the cassette case 18 shown in FIG. This is also the configuration in which the engaging element 26 that protrudes even higher is provided. Since the other parts are exactly the same as the configuration shown in FIG. 4, the same reference numerals are given and the description thereof is omitted.

In the present embodiment, when the magnetic tape cassette 87 is housed in the cassette case 88 and the case body side is closed, the tip of the engaging element 26 enters through the pin hole 28 of the magnetic tape cassette 87. Then, the cut-out opening 11 of the friction sheet 2 is opened to enter the uneven portion 15 of the hub 4, and is inserted into the groove portion 16 to prevent the hub 4 from rotating.

The pin hole 28 formed in the magnetic tape cassette 87 is provided on the center line C in the front-rear direction of the cassette. According to this configuration, when the magnetic tape cassette 87 is stored in the cassette case 88, the hub can be locked even if the cassette tape 88 is loaded upside down, and the cassette storage direction can be selected, and the cassette storage direction can be set. Improves usability when storing. This also applies to the magnetic tape cassette shown in FIG. The cassette cases 18 and 88 in each of the above-described embodiments are of a type in which the pocket portion 19 corresponds to the maximum thickness of the cassette, but the present invention is a slim type cassette case having a concave portion for receiving the cassette thickness increasing portion. Can be used.

[0018]

[Effect of device]

 As described above, the magnetic tape cassette and the cassette case of the present invention have elastic stoppers that are pressed by the pressing element of the cassette case when the magnetic tape cassette is stored and stored in the cassette case. The magnetic tape cassette can be stored without loosening because the tip of the stopper enters the uneven part of the hub and prevents rotation. Further, in a magnetic tape cassette having a pin hole, the tip of the pressing protrusion provided on the cassette case enters the uneven portion of the hub to prevent rotation, so that the magnetic tape cassette is stored without loosening. According to the structure in which the elastic stopper or the engaging element that engages with the uneven portion provided on the hub is provided in this way, the projection shape of the cassette case is simplified and the molding die of the cassette case is prevented from becoming complicated. Also, unlike the conventional one that engages with the hub claw to prevent the rotation of the hub, damage to the hub claw is avoided, and the magnetic tape cassette can be completely prevented from sagging. Alternatively, it is possible to store the magnetic tape cassette in the cassette case without causing a problem.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing a magnetic tape cassette according to an embodiment of the present invention in the middle of being stored in a cassette case.

FIG. 2 is an exploded perspective view of a magnetic tape cassette according to an embodiment of the present invention.

FIG. 3 is a perspective view of a hub of the magnetic tape cassette of FIG.

FIG. 4 is a perspective view of a cassette case used to store the magnetic tape cassette shown in FIG.

FIG. 5 is an exploded perspective view of a magnetic tape cassette according to another embodiment of the present invention.

FIG. 6 is a perspective view showing an embodiment of a cassette case for housing the magnetic tape cassette shown in FIG.

FIG. 7 is an exploded perspective view of a conventional magnetic tape cassette.

FIG. 8 is a perspective view of a conventional cassette case.

[Explanation of symbols]

 2 Friction sheet 3 Magnetic tape 4 Hub 8 Elastic stopper 9 Stopper pin 15 Concavo-convex part 17,87 Magnetic tape cassette 18, 88 Cassette case 19 Pocket part 20 Lid 22 Case body 24 Presser 26 Engager 28 Pin hole

Claims (7)

[Scope of utility model registration request] 1. A magnetic tape cassette in which a pair of hubs, around which a magnetic tape is wound, are rotatably housed in a hollow interior of a cassette case composed of a pair of upper and lower cassette halves so as to be sandwiched between a pair of upper and lower friction sheets. The hub has upper and lower end surfaces provided with concavo-convex portions continuous along the circumferential direction of the end surface, and the upper and lower cassette halves have stopper pins engageable with the concave portions at positions corresponding to the concavo-convex portions. There is an elastic stopper that can be elastically deformed inward by pressing from the outside of the cassette,
A magnetic tape cassette, wherein the stopper pin is configured to engage with the concave and convex portion to prevent rotation of the hub by pressing the elastic stopper. 2. The concavo-convex portion is a concavo-convex having a ridge line extending radially outward from the center of the hub, and at least the upper cross-sectional shape of the concavity is formed into an inclined surface-like guiding structure. The magnetic tape cassette according to claim 1. 3. A magnetic tape cassette in which a pair of hubs, around which a magnetic tape is wound, are rotatably housed in a hollow interior of a cassette case composed of a pair of upper and lower cassette halves so as to be sandwiched between a pair of upper and lower friction sheets. The hub has upper and lower end surfaces provided with a concavo-convex portion that is continuous along the circumferential direction of the end surface, and the upper and lower cassette halves engage with the concavo-convex portion at a position facing the concavo-convex portion. A magnetic tape cassette, characterized in that a pin hole is provided to allow entry of an engaging element that blocks rotation of the hub. 4. The magnetic tape cassette according to claim 1, wherein the stopper pin or the pressing member is allowed to be inserted into the friction sheet at a position corresponding to the insertion / removal of the stopper pin or the engaging member. A magnetic tape cassette having a cutout opening. 5. A case main body for accommodating an end portion of the magnetic tape cassette according to claim 1, the lid portion having a pocket portion, and a portion provided on the lid portion such that the magnetic tape cassette can be opened and closed, and the portion other than the portion accommodated in the pocket portion. And a pressing member for pressing the elastic stopper inwardly of the cassette when the lid part and the case body are closed in a state where the magnetic tape cassette is accommodated in the case body. A cassette case characterized by being provided. 6. A case main body for accommodating a lid portion having a pocket portion for accommodating one end of the magnetic tape cassette according to claim 3, and a portion provided on the lid portion so as to be openable and closable and accommodating a portion other than that accommodated in the pocket portion. A cassette case consisting of the magnetic tape cassette and the lid body and the case body being closed in a state where the magnetic tape cassette is housed, the cassette case is inserted into the pin hole of the cassette half and the concave-convex portion of the hub is formed. A case for a cassette, characterized in that an engaging element for engaging is provided on the case body. 7. The magnetic tape cassette according to claim 1, wherein the elastic stopper or the pin hole is provided on a center line in the cassette front-rear direction.