JPH087971B2 - Small tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is small in size to be directly attached to a recording / reproducing apparatus such as a video tape recorder (hereinafter abbreviated as VTR) dedicated to a standard tape cassette, The present invention relates to a small tape cassette that requires a tape cassette adapter or the like for use, and more particularly to a small tape cassette that can surely interlock brake release operations of a supply reel hub and a take-up reel hub.

(Prior Art) It is well known that standard tape cassettes of the standard type are generally used for VTRs, and compatibility with standard tape cassette dedicated VTRs that use this standard tape cassette is required. It is also well known that a small tape cassette, which is smaller than a standard tape cassette capable of recording and reproducing while keeping it, has been developed.

By the way, this small tape cassette can be recorded and reproduced by a small tape cassette dedicated VTR, while when it is used in a standard tape cassette dedicated VTR, this small tape cassette is stored in a tape cassette adapter of approximately the same shape as the standard tape cassette. Therefore, it can be used in the same way as the standard tape cassette.

Also, with the spread of this standard tape cassette VTR, recently a video camera and a small tape cassette VT
A so-called VTR with a built-in camera, which is integrated with the R, has been manufactured, and in this VTR with a built-in camera, a compact tape cassette that is smaller than the standard tape cassette is used to reduce the size of the device so that it is suitable for portable shooting. ing.

FIG. 12 is an external perspective view of a general small-sized tape cassette, which shows an open state.

As shown in the figure, the small tape cassette 1 is
A cassette housing 3 in which a magnetic tape 2 is housed and an upper half 3A and a lower half 3B are covered with each other, and the cassette housing 3 is pivotally supported on both left and right side surfaces of the cassette housing 3 by a shaft (pin) 10. The lid 4 is rotatably supported and opens and closes the front side opening of the cassette housing 3.

The lower half 3B is provided with a notch 3d for allowing the gear 7a formed on the outer peripheral surface of the lower flange of the winding reel hub 7 to face the right side surface of the cassette housing 3 in the figure. The notch 3d is defined when the upper and lower halves 3A and 3B are assembled. Reference numeral 12 is a groove for preventing erroneous insertion formed through the upper and lower halves 3A, 3B on the rear side of the cutout 3d. The magnetic tape 2 usually has left and right guide rollers 5. so as to cross the front opening.
It is stretched while being guided by 5, and is protected by closing the lid body 4. The lid 4 is clicked by a sliding piece 8 to which a sliding force is applied to the front side by a leaf spring 11 fitted and inserted in a U-shaped recess 9 formed on the right side front side of the cassette housing 3. Held in open and closed positions. 13 is a brake release pin insertion port.

When the small tape cassette 1 having the above-mentioned structure is mounted on a small tape cassette-dedicated VTR (not shown) and used, the small tape cassette 1 is inserted from the tape cassette insertion opening of the VTR to a predetermined position. 4 to 12
As shown in the drawing, the lid tape is rotated to a substantially horizontal position to open the lid, and then the small tape cassette 1 is lowered, for example, so that the supply reel hub 6 is fitted to the supply reel disk (not shown) of the VTR. Then, the gear 7a formed on the outer peripheral surface of the lower flange of the take-up reel hub 7 meshes with the drive gear (not shown) of the VTR, and inside the recesses 3a, 3b, 3c of the front side opening in the cassette housing 3. The VTR is attached to the VTR with vertical and inclined loading, respectively, and a capstan (neither shown) invaded.

In this way, recording / playback is possible with a VCR dedicated to a small tape cassette.

When the small tape cassette 1 is mounted on a standard tape cassette-dedicated VTR (not shown) and used, for example, a tape cassette adapter having the same shape as the standard tape cassette, as described in Japanese Utility Model Publication No. 60-37739. Alternatively, the standard tape cassette and the small tape cassette can both be stored in the storage part of the small tape cassette of the storage tray, and then mounted on the VTR.

By the way, in standard tape cassettes and small tape cassettes used in VTRs, a pair of reel hubs around which magnetic tapes are wound are housed in the cassette housing. It is fed from the front side opening and slides on the magnetic head of the VTR, and then returns to the inside from the front side opening and is wound on the winding reel hub. During rewinding, the magnetic tape is directly transferred from the take-up reel hub to the supply reel hub.

A brake mechanism is provided on each of the supply-side reel hub and the winding-side reel hub that perform such magnetic tape supply / rewinding, and the operation of this brake mechanism prevents unnecessary rotation of the supply-side reel hub and the winding-side reel hub. ing. This is because when the half is shocked from the outside by carrying a small tape cassette, the reel hub on the supply side or the reel hub on the take-up side unnecessarily rotates and loosens the magnetic tape. It is provided in order to avoid the possibility of problems such as bending and cutting.

FIG. 13 is an external perspective view of the small tape cassette shown in FIG. 12 with the upper half 3A removed, and the magnetic tape 2 is not stretched for convenience of illustration.

As shown in the figure, a supply reel hub 6 and a take-up reel hub 7 are housed in the lower half 3B, and a magnetic tape 2 is stretched between the reel hubs 6 and 7 (not shown). ). A brake mechanism is provided on each of the supply reel hub 6 and the take-up reel hub 7. 14
Is braked with the gear 7a. It is a reel stopper on the winding side.

FIG. 14 is a view showing a brake mechanism of the supply reel hub.

As shown in the figure, the lower flange of the supply reel hub 6
A plurality of ribs 6b having a trapezoidal cross section are radially provided on the 6a. Then, a plurality of ribs having a similar shape to the plurality of ribs 6b are formed above the inner surface of the lower half 3B so as to face the plurality of ribs 6b.
3Bc is formed. In the state shown in FIG. 12, the reel hub 6 on the supply side is moved from the upper half 3A to the lower half by a reel spring (not shown) fixed to the upper half 3A.
It is pressed toward the inner surface of 3B. At this time, since the plurality of ribs 6b provided on the supply reel hub 6 engage with the plurality of ribs 3Bc provided on the inner surface of the lower half 3B, a braking operation can be obtained, so that unnecessary rotation of the supply reel hub 6 can be prevented. Motion can be prevented at all times.

Therefore, the brake mechanism of the supply reel hub 6 comprises a plurality of ribs 6b and a plurality of ribs 3Bc.

This brake release operation is the VT of the small tape cassette 1.
After mounting on the R, the supply side disk shaft of the VTR or tape cassette adapter is inserted from below the supply reel hub 6 of the small tape cassette 1 to the inside thereof, and the supply reel hub 6 is pushed up slightly above the inner surface of the lower half 3B. Then, the engagement of the plurality of ribs 6b and the plurality of ribs 3Bc described above is released.

FIG. 15 is a view showing a brake mechanism of the take-up reel hub.

As shown in the figure, the lower flange of the take-up reel hub 7
At a position facing the gear 7a formed on the end face of 7b, a reel stopper 14 is rotatably supported by a support shaft 3Ba that is provided near the take-up reel hub 7 and projects on the inner surface of the lower half 3B.
Is provided with a plurality of chevron-shaped teeth 14a, and a spring (not shown) urges the teeth 14a of the reel stopper 14 against the gear 7a of the take-up reel hub 7 so that the teeth 14a mesh with each other. Therefore, unnecessary rotation of the winding reel hub 7 can be always prevented.

Therefore, the braking mechanism of the take-up reel hub 7 comprises a spring, chevron-shaped teeth 14a, and a gear 7a.

This brake release operation is the VT of the small tape cassette 1.
After mounting on the R, the reel brake release pin (not shown) of the VTR is inserted inward from below the brake release pin insertion port 13 formed in the lower half 3B, and the reel stopper
This is performed by pushing up 14 above the inner surface of the lower half 3B and disengaging the teeth 14a of the reel stopper 14 from the gear 7a of the winding reel hub 7.

(Problems to be Solved by the Invention) With the spread of the above-mentioned camera-integrated VTR, there are increasing demands for carrying a small tape cassette and demands for a small tape cassette capable of shooting for a long time.

For this reason, with respect to the above, it is possible to obtain a small tape cassette having a structure that does not damage the contained magnetic tape even when an impact is applied from the outside. It is desirable to obtain a small tape cassette with a structure that does not damage the contained thin magnetic tape even if an external shock is applied while using a magnetic tape with a thinner base film than before due to the size restrictions of It is rare.

However, the brake mechanism provided in the small tape cassette 1 shown in FIGS.
Since both the supply side and the winding side depend on the biasing force of the spring, there is a problem that the rotation of the pair of reel hubs 6 and 7 cannot be reliably locked when an external impact is applied to the small tape cassette 1. is there.

Also, with this brake mechanism, the small tape cassette 1
The lid 4 which can be freely opened and closed is opened to open the magnetic tape 2
There is a problem that it is not possible to stop when pulling out.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a small tape cassette having the following configuration.

It has a pair of reel hubs on which magnetic tape is stretched, and a pair of brake mechanisms that prevent unnecessary rotation of the pair of reel hubs, respectively, and transmits the brake release operation of one brake mechanism to the other brake mechanism. A small tape cassette in which the one brake mechanism and the other brake mechanism are connected to each other so that the brake releasing operation of the pair of brake mechanisms can be performed in an interlocking manner. A small tape cassette, characterized in that projections facing each other at intervals are provided on the at least one brake mechanism to prevent a claw portion of the at least one brake mechanism from entering the reel hub.

(Example) A small tape cassette according to the present invention will be described below with reference to FIGS. 1 to 11.

FIG. 1 is a perspective view of an embodiment showing an application state of a small tape cassette according to the present invention to a supply side brake, FIG. 2 is a plan view of the state shown in FIG. 1, and FIG. 3 is the present invention. FIG. 4 is a perspective view of an embodiment showing a state in which a small tape cassette is applied to a winding side brake, FIG. 4 is a partial plan view of the state shown in FIG. 3, and FIG. 5 is engagement between a supply reel hub and a brake piece. FIG. 6 is a view showing a state, FIG. 6 is a view showing a state where the claw portion of the brake mechanism enters the supply reel hub, FIG. 7 is a view showing an engagement state of the take-up reel hub and the brake piece, FIG. Are perspective views of the small tape cassette according to the present invention with the upper half removed, FIGS. 9 and 10 are views showing the braking mechanism of the winding reel hub, and FIG. 11 is a braking mechanism of the supply reel hub. It is a figure. The same components as those described above are designated by the same reference numerals, and the description thereof will be omitted. Note that pads 21f and 24c, which will be described later, are not shown in FIGS. 8 to 10 for convenience.

As will be described later, the small tape cassette according to the present invention includes a supply-side reel hub and a winding-side reel hub (a pair of reel hubs) 6, 7 on which a magnetic tape 2 is stretched, and a supply-side reel hub and a winding-side reel hub ( And a pair of brake mechanisms B and A for preventing unnecessary rotation of the pair of reel hubs 6 and 7, respectively, and transmits the brake release operation of one brake mechanism A to the other brake mechanism B. A small tape cassette 20 in which one brake mechanism A and the other brake mechanism B are connected so that the brake releasing operations of A and B can be performed in an interlocking manner, and the upper flanges 6d, By providing the at least one brake mechanism B, A with the abutment (projection) 24c, 21f facing the 7c at a predetermined interval t, the claw portions 21a, 24a of the at least one brake mechanism A, B are reeled. Breakfast 7,6
It is characterized in that it is configured to prevent entry into the inside.

The small tape cassette 20 according to the embodiment of the present invention is, as shown in FIG.
Remove the reel stopper 14 from the brake mechanism A, B described later.
Is a small tape cassette having a configuration obtained by adding a magnetic tape 2, a cassette housing 3 (upper and lower halves 3A and 3B), and a recess 3
a to 3c, support shafts 3Ba, 3Bb, notch 3d, lid 4, guide roller 5, supply-side reel hub 6, winding-side reel hub 7, gear
7a, sliding piece 8, U-shaped recess 9, pin 10, leaf spring 11, groove 12 for preventing erroneous insertion, brake release pin insertion port 13, brake mechanism A, B, and supply side An uneven tooth groove 6c is formed on the outer peripheral surface of the lower flange of the reel hub 6 (the uneven tooth groove 6c is shown here, but other shapes may be used).

The above-mentioned brake mechanism A of the take-up reel hub 7 comprises a brake arm 21 and a spring 22.

The brake arm 21 is, as shown in FIGS. 8 and 9,
A support shaft 3Ba protrudingly provided on the inner surface of the lower half 3B in the vicinity of the winding reel hub 7 is rotatably supported by a support shaft 3Ba. Always urged.

Therefore, the magnetic tape 2 wound around the take-up reel hub 7 is always ready for winding.

The brake arm 21 has a claw portion 21 that engages with a gear 7a of the take-up reel hub 7 that is constantly urged in the direction of arrow a in the figure.
a, a brake release pin receiver 21b rotated in the direction of the arrow b in the figure by the reel brake release pin 23 of the VTR, and a pin 21d provided at the tip of the brake release pin receiver 21b. Brake mechanism B (brake piece 24
It is composed of an arm 21c which transmits to a receiver 24b). 21e
Is an end surface of the brake release pin receiver 21b.

As shown in FIG. 10, since the support shaft 3Ba is projectingly provided on the inner surface of the lower half 3B of the take-up reel hub 7, the brake arm pivotally supported by the support shaft 3Ba. By selecting the shape of the claw portion 21a provided at the tip of 21 so as to closely engage with the tooth surface of the gear 7a of the take-up reel hub 7, the direction of the arrow b in FIG. The rotation of the winding reel hub 7 in the direction in which the wound magnetic tape 2 loosens can always be reliably locked, and the direction of the arrow a in the figure (the magnetic tape wound on the winding reel hub 7). 2 reel hub 7 in the winding direction 2)
Can be always rotated.

The brake release operation of the brake mechanism A is performed by attaching the small tape cassette 20 to the VTR, and then inserting the brake release pin insertion opening 13 of the reel brake release pin 23 of the VTR into the lower half 3B of the small tape cassette 20. From bottom to bottom half
When it is inserted inwardly of 3B, the reel brake release pin 23 comes into contact with the end surface 21e of the brake release pin receiver 21b of the brake arm 21 and presses it in the direction of arrow b, whereby the brake arm 21 rotates the support shaft 3Ba. As a result of the rotation in the direction of the arrow b as the core, the engagement is performed by releasing the engagement between the claw portion 21a of the brake arm 21 and the gear 7a of the winding reel hub 7 described above. Although the end surface 21e is shown as a slope, this shape may be other than the slope depending on the shape of the brake release pin receiver 21b.

Now, the brake mechanism B of the supply reel hub 6 is
As shown in FIG. 11 and FIG. 11, the brake piece 24 and the spring
It consists of 25.

The brake piece 24 is the lower half near the supply reel hub 6.
It is rotatably supported by a support shaft 3Bb protrudingly provided on the inner surface of 3B, and is constantly urged in the direction of arrow b in the figure by the urging force of a spring 25 attached below this.

Therefore, the magnetic tape 2 wound around the supply-side reel hub 6 is always ready for winding.

The brake piece 24 includes a claw portion 24a that is constantly biased in the direction of the arrow b in the figure and is engaged with the tooth groove 6c of the supply reel hub 6, and the pin 21d of the brake mechanism A of the winding reel hub 7 described above.
And a receiver 24b which is engaged with the pin and is rotated by the pin 21d in the direction of arrow a.

The receiver 24b engaged with the pin 21d is always biased in the direction of the arrow b, but this biasing force is not easily applied by the biasing force of the claw portion 21a transmitted by the pin 21d in the direction of the arrow b. Therefore, the claw portion 24a can be easily rotated in the arrow a direction.

As shown in FIG. 11, the support shaft 3Bb is provided on the inner surface of the lower half 3B of the supply reel hub 6 in a substantially tangential direction so that the brake piece 24 supported by the support shaft 3Bb is supported. By selecting the shape of the claw portion 24a provided at the tip of the so that it closely engages with the tooth groove 6c of the supply reel hub 6, the direction of the arrow a in FIG. Supply reel hub 6 in the direction in which tape 2 loosens)
The rotation of the supply reel hub 6 can be reliably locked at all times, and the rotation of the supply reel hub 6 in the direction of the arrow b in the figure (the direction in which the magnetic tape 2 wound around the supply reel hub 6 is wound here) can be prevented. It can be possible at all times.

As described above, since the brake mechanism A is connected to the brake mechanism B (engagement between the pin 21d and the receiver 24b), the brake release operation of the brake mechanism B is performed in conjunction with the brake release operation of the brake mechanism A. Be seen.

That is, after the small tape cassette 20 is attached to the VTR, the reel brake release pin 23 of the VTR is inserted from the lower side of the brake release pin insertion hole 13 formed in the lower half 3B of the small tape cassette 20 to the inside of the lower half 3B. When inserted, the reel brake release pin 23 of the VTR abuts against the end face 21e of the brake release pin receiver 21b of the brake mechanism A and presses it in the direction of arrow b), whereby the brake arm 21 causes the support shaft 3Ba to be centered. Rotate in the direction of arrow b as
The claw portion 21a of 21 and the gear 7a of the reel hub 7 on the winding side are disengaged. At the same time, the movement of the claw portion 21a of the brake arm 21 is transmitted via the pin 21d provided at the tip of the arm 21c to the receiver 2 of the brake mechanism B that engages with this pin 21d.
4b, and by pressing this receiver 24b in the direction of arrow a, the brake piece 24 rotates in the direction of arrow a with the support shaft 3Bb as the axis, and as shown by the broken line in FIG.
The above-mentioned claw portion 24a of the brake piece 24 and the supply-side reel hub 6
The engagement with the tooth groove 6c is released.

As described above, the brake mechanism B is interlocked with the brake release operation (the engagement between the claw portion 21a of the brake arm 21 and the gear 7a of the winding reel hub 7) by the brake mechanism B.
The brake release operation (the engagement between the claw portion 24a of the brake piece 24 and the tooth groove 6c of the supply-side reel hub 6) can be performed in conjunction with each other, and accordingly, the break hex of each of the supply-side reel hub 6 and the winding-side reel hub 7 is Since the operation and the brake release can be performed reliably and accurately, and the magnetic tape 2 wound around both the supply-side reel hub 6 and the winding-side reel hub 7 can be always rotated in the winding direction, the magnetic tape 2 can always be stretched without slack or slack. Further, it is possible to prevent the magnetic tape 2 from being pulled out by opening the lid 4.

By the way, in the above-described small tape cassette, the claw portion 24a of the brake piece 24 and the tooth groove 6c of the supply reel hub 6 are engaged with each other, or due to an impact or the like when the user accidentally drops the tape cassette. Claw portion 21a of the brake arm 21
And the gear 7a of the take-up reel hub 7 are disengaged, and the brake piece 24 or the brake arm 21 enters the reel hub 6 or 7 by the spring force of the spring 22 or 25 that urges the brake arm 24 toward the reel hub. , The brake piece 24 or the claw portions 24a, 21a of the brake arm 21 are connected to the reel hubs 6,7.
It was found that the signal recorded on the magnetic tape 2 wound on the disk was damaged.

Therefore, in order to prevent the brake piece 24 or the claw portions 24a, 21a of the brake arm 21 from hitting the magnetic tape 2 and damaging the recorded signal, a part of the brake mechanism A, B is provided with an upper flange 6d, Height s equivalent to 7c (that is, the distance between the upper and lower flanges 6a, 6d and the claw 24a of the brake piece 24
The distance between 24c is s, and the distance between the upper and lower flanges 7b and 7c and the distance between the claw portion 21a and the contact 21f of the brake arm 21 are both s). By providing the abutments (projections) 24c and 21f which face each other with a certain interval t, the claw portions 24a and 21a are provided inside the reel hubs 6 and 7 at the time of assembly or when a shock is applied when the user accidentally drops them. Configured to prevent entry into the.

As shown in FIG. 1, the brake piece 24 is provided with not only the claw portion 24a but also a contact 24c at a position where it comes into contact with the upper flange 6d, so that the brake piece 24 receives a shock when assembled or accidentally dropped by the user. When the claw 24a is added, the reel hub 6 on the supply side
When the rider rides on the tooth groove 6c of the lower flange 6a, the abutment 24c and the upper flange 6d previously come into contact with each other, thereby preventing the claw portion 24a from further entering the supply reel hub 6.

In order to secure the brake and prevent the claw 24a from entering, as shown in FIG.
4c The gap difference (spacing) t between the respective supply reel hubs 6 is about 0.5 mm to 2 mm, ideally 1 mm to 1.5 mm
The degree is desirable. The shape of the pad 24c is not limited to that shown in the figure.

FIG. 3 shows an example in which the present invention is used for the reel hub 7 on the take-up side. As shown in FIG. 3, like the supply side, the impact at the time of assembly or when the user accidentally drops it. When the arm is touched, the pad 2 placed at any position on the arm 21c
By preliminarily contacting the upper flange 7c of the take-up reel hub 7, the claw portion 21a is prevented from further entering the take-up reel hub 7.

As shown in FIG. 4, in order to secure the brake and further prevent the claw portion 21a from entering, the claw portion 21a and the contact 2
The difference (gap) t of the gap between the reel hubs 1f of each 1f is about 0.5 mm to 2 mm, ideally 1 mm to 1.5 mm.
The degree is desirable. The shape of the pad 21f is not limited to that shown in the figure.

FIG. 5 shows the tooth groove 6c of the lower flange 6a of the reel hub 6 on the supply side.
And the brake piece 24 without the above-mentioned pad 24c
FIG. 6 is a diagram showing an engagement state with a claw portion 24a.

FIG. 6 is a view showing a state where the claw portion 24a of the brake mechanism B enters the supply reel hub 6.

FIG. 7 shows the gear 7a of the lower flange 7b of the reel hub 7 on the winding side.
FIG. 6 is a diagram showing an engagement state with a claw portion 21a of the brake piece 21.

The above description has been made on the provision of the pads 21f and 24a on one of the take-up side brake mechanism A and the supply side brake mechanism B. Although not described in detail here, the above-mentioned pads may be provided if necessary. Of course, 21f and 24a may be provided at the same time.

Although the small tape cassette used for the VTR has been described above, it goes without saying that the small tape cassette according to the present invention can be applied to technical fields other than the VTR.

(Effects of the Invention) As described above, the present invention particularly transmits one brake release operation of the one brake mechanism to the other brake mechanism so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other. A mechanism is connected to the other brake mechanism, and at least one of the brake mechanisms is provided with a protrusion that faces the upper flange of the reel hub when the brake is actuated. The brakes can be released reliably, and the claws of the brake mechanism can be prevented from entering the reel hub during assembly or when a shock is applied when the user accidentally drops the brakes. There is an effect that the looseness of the magnetic tape stretched over the pair of reel hubs and the damage to the magnetic tape can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment showing an application state of a small tape cassette according to the present invention to a supply side brake, FIG. 2 is a plan view of the state shown in FIG. 1, and FIG. 3 is the present invention. FIG. 4 is a perspective view of an embodiment showing a state in which a small tape cassette is applied to a winding side brake, FIG. 4 is a partial plan view of the state shown in FIG. 3, and FIG. 5 is engagement between a supply reel hub and a brake piece. FIG. 6 is a view showing a state, FIG. 6 is a view showing a state where the claw portion of the brake mechanism enters the supply reel hub, FIG. 7 is a view showing an engagement state of the take-up reel hub and the brake piece, FIG. Are perspective views of the small tape cassette according to the present invention with the upper half removed, FIGS. 9 and 10 are views showing the braking mechanism of the winding reel hub, and FIG. 11 is a braking mechanism of the supply reel hub. Figures and 12 are external perspective views of general small tape cassettes, Fig. 3 is an external perspective view of the small tape cassette shown in Fig. 12 with the upper half removed, Fig. 14 shows the brake mechanism of the supply reel hub, and Fig. 15 shows the brake mechanism of the take-up reel hub. FIG. 1,20 …… Small tape cassette, 2 …… Magnetic tape, 3 …… Cassette housing, 3a to 3c …… Recess, 3d …… Notch, 3A …… Upper half, 3B …… Lower half, 3Ba, 3Bb …… Support shaft, 4 …… Lid, 5 …… Guide roller, 6 …… Supply side reel hub, 6a …… Lower flange, 6c …… Tooth groove, 6d …… Top flange, 7 …… Winding side reel hub, 7a …… gear, 7b …… bottom flange, 7c …… upper flange, 8 …… sliding piece, 9 …… U-shaped recess, 10 …… pin, 11 …… plate spring, 12 …… prevention of incorrect insertion Groove, 13 …… Brake release pin insertion port, 21 …… Brake arm, 21a, 24a …… Claw part, 21b …… Brake release pin receiver, 21c …… Arm, 21d …… Pin, 21e …… End surface, 21f, 24c …… Abutment (projection), 22,25 …… Spring, 23 …… Reel brake release pin, 24 …… Brake piece, 24b …… Reception, A, B …… Brake mechanism, s …… Is, t ...... gap.

Claims (1)

[Claims] 1. A pair of reel hubs on which a magnetic tape is stretched, and a pair of brake mechanisms that prevent unnecessary rotation of the pair of reel hubs, respectively. A small tape cassette that connects the one brake mechanism and the other brake mechanism so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other by transmitting the brake mechanism to the brake mechanism. The at least one brake mechanism is provided with a protrusion that faces the upper flange at a predetermined distance to prevent the claw portion of the at least one brake mechanism from entering the reel hub. Small tape cassette.