JPH0810545B2 - 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) Generally, it is well known that a standard tape cassette of a standard type is used for a VTR, and is compatible with a standard tape cassette dedicated VTR that uses this standard tape cassette. However, it is well known that a small tape cassette, which is smaller than the standard tape cassette capable of recording and reproducing, 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. 9 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. This notch
3d is partitioned and formed when the upper and lower halves 3A and 3B are assembled. 1
Reference numeral 2 is a groove for preventing erroneous insertion formed through the upper and lower halves 3A and 3B on the rear side of the cutout 3d. The magnetic tape 2 is usually
It is stretched while being guided by the left and right guide rollers 5.5 so as to cross the front opening, and is protected by closing the lid body 4. The lid 4 has 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.
It is clicked and held in the 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 9
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. 60-377739. Alternatively, the standard tape cassette and the small tape cassette can both be stored in the storage unit 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 a shock is applied to the half from the outside by carrying a small tape cassette, the reel reel hub on the supply side or the reel hub on the take-up side unnecessarily rotates and loosens the magnetic tape, which causes uneven rotation and breakage of the magnetic tape. It is provided in order to avoid the possibility of problems such as bending and cutting.

FIG. 10 is an external perspective view of the small tape cassette shown in FIG. 9 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. 11 is a diagram showing a brake mechanism of the supply-side 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. 9, the supply side reel hub 6 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. 12 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 configurations (1) to (4).

(1) It has a pair of reel hubs on which a magnetic tape is stretched, and a pair of brake mechanisms that respectively prevent unnecessary rotation of the pair of reel hubs. The brake release operation of one brake mechanism is performed by 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 release operation of the pair of brake mechanisms can be performed in conjunction with each other. Maintaining the engagement relationship between the pair of brake mechanisms while setting the lever ratio of the brake arm so that a predetermined gap is obtained between the brake arm related to the mechanism and the brake piece related to the other brake mechanism receiving the brake arm. When the brake is released, the reel hub that engages with the brake piece is configured to be rotatable within a predetermined range. Small tape cassette, characterized in that.

(2) It has 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, and the brake release operation of one brake mechanism is performed by 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 release operation of the pair of brake mechanisms can be performed in conjunction with each other. A small tape cassette, wherein a slit into which a test piece of a jig can be inserted is provided, and the jig can be used to inspect and correct the set position of the brake piece.

(3) It has 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. The brake release operation of one brake mechanism is performed by the other brake mechanism. A small tape cassette in which the one brake mechanism and the other brake mechanism are interlocked with each other so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other. A spring support portion is provided on the outer peripheral surface of the shaft portion of the brake piece related to the arm and / or the other brake mechanism that receives the brake arm, the spring support portion being perpendicular to the shaft portion, and holding the spring perpendicular to the shaft portion. A small tape cassette characterized by being made possible.

(4) It has 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. The brake release operation of one brake mechanism is performed by the other brake mechanism. Is a small tape cassette in which the one brake mechanism and the other brake mechanism are connected to each other so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other. A release lever for transmitting the movement of the reel brake release pin to the brake arm related to the one brake mechanism in response to the insertion of the pin is provided, so that the brake arm ensures a reliable operation regardless of the outer shape of the reel brake release pin. A small tape cassette that is configured to enable easy brake release.

(Example) Hereinafter, a small tape cassette according to the present invention will be described with reference to FIGS.

FIG. 1 is an explanatory view of an engagement relationship between a brake piece and a brake arm of a small tape cassette according to the present invention, and FIG. 2 is an explanatory view of a relationship between a brake piece and a jig of a small tape cassette according to the present invention, 3 (A) and 3 (B) are views showing the shape of the spring support portion formed on the brake piece, FIG. 4 is a view showing a release lever provided near the brake arm, and FIG. FIG. 6 and FIG. 7 are views showing the brake mechanism of the take-up reel hub, respectively, and FIG. 8 is a view showing the brake mechanism of the supply reel hub. is there. The same components as those described above are designated by the same reference numerals, and the description thereof will be omitted. Incidentally, a support shaft 3Bc, a spring support portion (protrusion 24e, step 24f), a release lever 31, and a receiver 31a, which will be described later, are not shown in FIGS.

The small tape cassette according to the present invention has a supply-side reel hub and a winding-side reel hub (a pair of reel hubs) on which a magnetic tape 2 is stretched, as shown in FIG. 1 described later.
6 and 7 and a pair of brake mechanisms B and A for preventing unnecessary rotation of the supply-side reel hub and the winding-side reel hub (a pair of reel hubs) 6 and 7, respectively, and the brake of one brake mechanism A. A small tape cassette 20 in which one brake mechanism A and the other brake mechanism B are connected so that the release operation is transmitted to the other brake mechanism B so that the brake release operations of the pair of brake mechanisms A and B can be performed in conjunction with each other. Therefore, in the brake mechanism, the lever ratio of the brake arm 21 is set so that a predetermined gap u is obtained between the brake arm 21 of one brake mechanism A and the brake piece 24 of the other brake mechanism B that receives this brake arm 21. (Expansion rate; α:
β) is set and the engagement relationship between the pair of brake mechanisms A and B is maintained, and when the brake is released, the supply reel hub 6 that engages with the brake piece 24 is configured to be rotatable within a predetermined range. It is characterized by that.

The small tape cassette according to the present invention has a supply reel hub and a take-up reel hub (a pair of reel hubs) 6 and 7 on which a magnetic tape 2 is stretched, as shown in FIG. A supply side reel hub and a take-up side reel hub (a pair of reel hubs) 6 and 7 respectively have a pair of brake mechanisms B and A for preventing unnecessary rotation, and the brake release operation of one brake mechanism A is performed by the other brake. Mechanism B
A small tape cassette 20 in which one brake mechanism A and the other brake mechanism B are connected to each other so that the brake release operation of the pair of brake mechanisms A and B can be performed in conjunction with each other. Jig on the brake piece 24 related to
A slit 24c into which 30 inspection pieces 30a can be inserted is provided, and the jig 30
This is characterized in that the setting position of the brake piece 24 can be inspected and corrected by.

Further, the small-sized tape cassette according to the present invention has a supply-side reel hub and a winding-side reel hub (a pair of reel hubs) on which the magnetic tape 2 is stretched, as shown in FIGS. 3 (A) and (B) described later. ) 6, 7 and a pair of brake mechanisms B, A for preventing unnecessary rotation of the supply-side reel hub and the winding-side reel hub (a pair of reel hubs) 6, 7, respectively. A small tape cassette 20 in which one brake mechanism A and the other brake mechanism B are connected so that the brake release operation is transmitted to the other brake mechanism B so that the brake release operations of the pair of brake mechanisms A and B can be performed in conjunction with each other. And a shaft portion of the brake arm 21 of the one brake mechanism A and / or the brake piece 24 of the other brake mechanism B that receives the brake arm 21.
Spring support on the outer surface of 24g perpendicular to the shaft 24g
24e and 24f are provided so that the spring 25 can be held perpendicularly to the shaft portion 24g.

Furthermore, the small-sized tape cassette according to the present invention has a supply-side reel hub and a winding-side reel hub (a pair of reel hubs) 6 and 7 on which a magnetic tape 2 is stretched, as shown in FIG. The supply side reel hub and the take-up side reel hub (a pair of reel hubs) 6 and 7 respectively have a pair of brake mechanisms B and A for preventing unnecessary rotation, and the brake release operation of one brake mechanism A is performed by the other. A small tape cassette in which one brake mechanism A and the other brake mechanism B are connected to each other so that the brake release operation is transmitted to the brake mechanism B and the brake releasing operation of the pair of brake mechanisms A and B can be performed in an interlocking manner.
20. When the reel brake release pin 23 is inserted into the small tape cassette 20 (lower half 3B), the movement of the reel brake release pin 23 is transmitted to the brake arm 21 of one brake mechanism A. Release lever 31
It is characterized by being configured so that the brake arm 21 can surely release the brake regardless of the outer shape of the reel brake release pin 23.

A small tape cassette 20 according to an 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 opening 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. 5 and 6,
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. 7, the support shaft 3Ba is provided on the inner surface of the lower half 3B of the take-up reel hub 7 in a substantially tangential direction, so that the brake arm pivotally supported by the support shaft 3Ba is provided. 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-side reel hub 6 is
As shown in FIG. 8 and FIG. 8, 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 ready to be wound around the magnetic tape 2 here.

The brake piece 24 includes a claw portion 24a that is constantly urged in the direction of the arrow b in the figure and is engaged with the gear 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. 8, 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 surface 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 rotates the support shaft 3Ba. As the core, it rotates in the direction of arrow b, and the claw portion 21a of the brake arm 21 and the gear 7a of the winding reel hub 7 are disengaged. At the same time, the movement of the claw portion 21a of the brake arm 21 is changed by the pin 21d provided at the tip of the arm 21c.
Is transmitted to a receiver 24b of the brake mechanism B that engages with the pin 21d via the pin 24d and presses the receiver 24b in the direction of arrow a, so that the brake piece 24 rotates in the direction of arrow a with the support shaft 3Bb as the axis. As shown by the broken line in FIG. 8, the claw portion 24a of the brake piece 24 and the tooth groove 6c of the supply reel hub 6 are disengaged.

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, the above-mentioned small tape cassette has the following problems.

In order to facilitate the loading of the small tape cassette 20 into the small tape cassette VTR or the tape cassette adapter, the position of the supply reel hub 6 can be moved (rotated) within a certain range when the reel hub 6 is not loaded. . Therefore, when the brake piece 24 that restricts the movement of the supply reel hub 6 tries to follow the movement of the supply reel hub 6, the movement of the brake piece 24 is large, and depending on the situation, the brake arm 21 that also serves as the brake of the take-up reel hub 7.
Therefore, the movement of the brake piece 24 to follow the movement of the supply-side reel hub 6 is limited, and therefore, there is a fear that the small tape cassette 20 cannot be easily loaded into the small tape cassette dedicated VTR or the tape cassette adapter. .

Since the support shaft 3Bb of the brake piece 24 is merely a cylindrical shape, when the brake mechanism B is assembled to the lower half 3B, the normal direction of the brake piece 24 projecting on the lower half 3B is set by using an automatic assembly machine. Since it is difficult to check the assembly, it cannot be assembled with high accuracy, and the claw 24a of the brake piece 24
When the rider rides on the lower flange 6a of the supply reel hub 6, or when it is desired to rotate the brake piece 24 slightly when the spring 25 is attached after that, the support shaft 3Bb of the brake piece 24 has a catching portion for this. Without
Therefore, using an automatic assembly machine, the brake piece on the lower half 3B
Workability is poor for mounting the 24 support shafts 3Bb with high precision.

A spring that gives rotational force in the small tape cassette 20.
Generally, a torsion spring is used as 22,25, and such a spring is attached with a shaft portion of a component that requires a rotational force or a pivot shaft supporting the shaft portion as a shaft core. Since the torsion spring has a reduced winding diameter when it is flexed by being applied with a force, it is usually provided with some clearance to the shaft portion. When the pivot is used as the shaft center, it is better that the upper end surface of the component serves as the pedestal, but when the shaft of the component is used as the shaft center, there is no cradle and there is clearance, so the spring The mounting posture of the brake arm becomes unstable.
Is difficult to wind.

To release the brake of the small tape cassette 20, as the reel brake release pin 23 is inserted into the small tape cassette 20, the brake arm 21 follows the outer shape of the reel brake release pin 23, and the brake arm 21 moves in the direction of arrow b. It rotates, and its rotating action is used to release the break. Therefore, with this brake release method, the reel brake release pin
Since the brake arm 21 moves along the outer shape of the reel 23, it is easily affected by the outer shape of the reel brake release pin 23.

As a solution to the above problem, there is an engagement relationship between the brake arm 21 and the brake piece 24 shown in FIG.

That is, as shown in the figure, the supply-side reel hub 6 in the cassette housing 3 of the small tape cassette 20 is shown in the figure when the small tape cassette VTR or tape cassette adapter is loaded into the small tape cassette 20. It is possible to move within the range shown by the alternate long and short dash line. At this time, when the brake piece 24 tries to maintain the engagement relationship with the brake arm 21 of the take-up reel hub 7 by following this movement of the supply reel hub 6, the brake piece 24 is indicated by the solid line in the figure. To the part indicated by the broken line. Therefore, during this time, it is not desirable to restrict the rotation of the brake piece 24 by the contact between the receiver 24b of the brake piece 24 and the pin 21d of the brake arm 21, so as shown in FIG.
A gap u is provided between the two even when they are closest to each other.

Further, the pin 21d of the brake arm 21 must go beyond this gap u to further rotate the receiver 24b of the brake piece 24. Therefore, the brake arm 21 has to enlarge the rotation obtained by the reel brake release pin 23, but in order to secure this gap u and reliably transmit the braking operation, the lever ratio (enlargement ratio; α:
β) should be between 1: 6 and 1:12.

As a result, the operating distance of contact between the pin 21d of the brake arm 21 and the receiver 24b of the brake piece 24 can be increased, and this can be transmitted to the brake piece 24 to supply reel hub 6 on the supply side.
The brake release operation of the brake piece 24 can be reliably performed.

In addition, as a means for solving the above-mentioned problem, the second
There is a relationship between the brake piece and the jig shown in the figure.

That is, as shown in the figure, the slit 24c is provided on the upper end surface of the cylindrical brake piece 24. A slope 24d for guiding is provided at the end of the slit 24c.

Then, for example, a jig 30 having an inspection piece 30a that is attached to an automatic assembly machine (not shown) and corresponds to the slit 24c is inserted into the slit 24c of the brake piece 24 facing downward from above in the figure of the brake piece 24. . In this way, by detecting the height of the brake piece 24 from the lower flange 3B of the inspection piece 30a, it is possible to confirm whether or not the claw portion 24a of the brake piece 24 rides on the lower flange 6a of the supply reel hub 6. Further, by detecting the orientation (rotational direction) of the inspection piece 30a, it is possible to detect the mounting accuracy of the brake piece 24 on the lower half 3B, and further positively rotate the inspection piece 30a to the normal position. Brake piece not installed 24
It is possible to correct the direction of or the auxiliary operation when the spring 25 is applied to the brake piece 24. The shape of the slit 24c is not limited to that shown in the figure.

Thus, the slit 24c is provided on the upper end surface of the shaft portion 24g of the brake piece 24, and the inspection piece 3 corresponding to the brake piece 24 to be inspected is provided.
Since 0a can be inserted into the slit 24c from the automatic assembly machine and the assembly operation such as inspection of set position, rotation, and positioning can be performed, the brake piece 24 can be accurately attached to the regular position by the automatic assembly machine. .

Further, as a means for solving the above-mentioned problem, there is a relation with the shape of the spring support portion formed on the brake piece shown in FIGS. 3 (A) and 3 (B).

That is, as shown in FIGS.
By providing a plurality of protrusions 24e or horizontal steps 24f on the outer peripheral surface of the shaft portion 24g of 24, and by receiving a spring 25 (not shown) wound here, the spring 25 is horizontally arranged with respect to the lower half 3B. It can be kept accurate. The number of the protrusions 24e is not limited to that shown in the figure, and it is also possible to substitute a part of the protrusions 24e with arms extending from the brake piece 24.

Further, although the brake arm 21 is not shown for convenience, a plurality of protrusions 21h or horizontal steps 21i are provided on the outer peripheral surface of the shaft portion 21g of the brake arm 21 in the same manner as the brake piece 24 described above. Spring wound around 22
By receiving the spring against the lower half 3B
22 can be kept horizontally and accurately. Note that the protrusion 21h
The number of is not limited to that shown in the figure, and it is also possible to substitute a part of the protrusion 21h with arms extending from the brake arm 21.

Further, the above description has been made on the case where the shaft portions of the brake arm 21 or the brake piece 24 are provided with a plurality of protrusions or steps, but if necessary, a plurality of shaft portions of the brake arm 21 and the brake piece 24 are provided respectively. It goes without saying that the projections and the steps may be provided.

The protrusions 21h and 24e and the steps 21i and 24f described above are referred to as spring support portions in the present invention.

Furthermore, as a means for solving the above-mentioned problem, there is a release lever provided near the brake arm shown in FIG.

That is, as shown in the figure, a support shaft 3Bc is newly provided in the cassette housing 3 of the small tape cassette 20, and a release lever 31 is fitted to the support shaft 3Bc so as to be slidable up and down in the figure, and then released. The lever 31 is constantly urged downward by a spring (not shown) in the figure. The release lever 31 has a receiver 31a whose lower surface abuts on the top of the reel brake releasing pin 23 shown by a broken line, and a receiver 31a which extends to the receiver 31a and is inserted into the cassette housing 3 as the reel brake releasing pin 23 is inserted. It has a protrusion 31b that comes into contact with the brake release pin receiver 21b of the brake arm 21. The release lever 31 slides upward in the figure as the reel brake release pin 23 is inserted into the cassette housing 3.

In this way, the protrusion 31b of the release lever 31 presses the brake release pin receiver 21b of the brake arm 21 to rotate it, and the brake of the brake arm 21 is released.
Of course, the brake of the brake piece 24 is also released in conjunction with this.

In this way, as the release lever 31 is inserted into the cassette casing 3 as the reel brake release pin 23 is inserted, the brake release pin of the brake arm 21 is irrelevant regardless of the outer shape of the reel brake release pin 23 (particularly the shape of the top thereof). Receiving 21
Rotating force can be generated by pressing b. Here, the brake release pin receiver 21b has a sloped surface that contacts the receiver 31a, but this sloped surface may be provided on the receiver 31a.

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.

(Effect of the invention) As described above, the present invention is
Maintaining the engagement relationship between the pair of brake mechanisms while setting the lever ratio of the brake arms so that a predetermined gap is obtained between the brake arm of one brake mechanism and the brake piece of the other brake mechanism that receives this brake arm. However, when the brake is released, the reel hub that engages with the brake piece is configured to be rotatable within a predetermined range.Therefore, when the brake is actuated, the pair of brake mechanisms independently engages with each reel hub. Maintain and release the brake,
Since the reel hub that engages with the brake piece can be rotated within a predetermined range, the brake can be reliably released, and, for example, it is extremely easy to load the small tape cassette into the VCR dedicated to the small tape cassette or the tape cassette adapter. is there.

Further, according to the present invention, in particular, since the slit that allows the inspection piece of the jig to be inserted is provided in the brake piece related to the other brake mechanism, the setting position of the brake piece can be inspected and corrected by the jig. Since it is easy to perform automatic assembly using an automatic assembling machine equipped with, and to detect and correct the positioning when the brake piece is projected, there is an effect that workability during automatic assembly is improved.

Furthermore, the present invention particularly provides a spring support portion on the outer peripheral surface of the shaft portion of the brake arm of one brake mechanism and / or the brake piece of the other brake mechanism that receives this brake arm, perpendicular to the shaft portion. Since the spring is provided so that it can be held vertically to the shaft, the spring can be easily and well wound around the outer peripheral surface of the shaft of the brake arm and brake piece. There is an effect that the winding work of the spring that has been used can be performed easily and accurately.

Furthermore, the present invention is particularly provided with a release lever for transmitting the movement of the reel brake release pin to the brake arm of one of the brake mechanisms when the reel brake release pin is inserted into the small tape cassette. Therefore, there is an effect that the brake arm can surely release the brake without being influenced by the outer shape of the reel brake release pin.

[Brief description of drawings]

FIG. 1 is an explanatory view of an engagement relationship between a brake piece and a brake arm of a small tape cassette according to the present invention, and FIG. 2 is an explanatory view of a relationship between a brake piece and a jig of a small tape cassette according to the present invention, 3 (A) and 3 (B) are views showing the shape of the spring support portion formed on the brake piece, FIG. 4 is a view showing a release lever provided near the brake arm, and FIG. FIG. 6 and FIG. 7 are views showing the braking mechanism of the take-up reel hub, respectively, and FIG. 8 is a view showing the braking mechanism of the supply reel hub. FIG. 9 is an external perspective view of a general small tape cassette, FIG. 10 is an external perspective view in which the upper half of the small tape cassette shown in FIG. 9 is removed, and FIG. 11 is a brake mechanism of a supply reel hub. Fig. 12 shows the winding Showing the brake mechanism of the reel hub. 1,20 ... Small tape cassette, 2 ... Magnetic tape, 3 ...
… Cassette housing, 3a to 3c… Concave, 3d… Notch, 3A…
… Upper half, 3B …… Lower half, 3Ba, 3Bb, 3Bc …… Support shaft, 4 …… Lid body, 5 …… Guide roller, 6 …… Supply reel hub, 6a …… Lower flange, 6c …… Tooth groove , 6d …… Upper flange, 7 …… Take-up reel hub, 7a …… Gear, 7b ……
Lower flange, 7c …… Upper flange, 8 …… Sliding piece, 9 ……
U-shaped recess, 10 …… pin, 11 …… plate spring, 12 …… groove to prevent incorrect insertion, 13 …… brake release pin insertion port, 21 ……
Brake arm, 21a, 24a ... Claw part, 21b ... Brake release pin receiver, 21c ... Arm, 21d ... Pin, 21e ... End face, 21h, 21i, 24e, 24f ... Spring support part, 21g, 24g …
… Shaft, 22,25 …… Spring, 23 …… Reel brake release pin, 24 …… Brake piece, 24b …… Receptor, 24c …… Slit, 30 …… Jig, 30a …… Inspection, 31 …… Release lever, 31a …… Reception, A, B …… Brake mechanism, u …… Gap.

Claims (4)

[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 in which the one brake mechanism and the other brake mechanism are connected to each other so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other. The engagement relationship between the pair of brake mechanisms while setting the lever ratio of the brake arm so that a predetermined gap is obtained between the brake arm of the brake mechanism and the brake piece of the other brake mechanism that receives the brake arm. To maintain the
A small tape cassette, wherein a reel hub engaging with the brake piece is configured to be rotatable within a predetermined range. 2. A pair of reel hubs on which a magnetic tape is stretched, and a pair of brake mechanisms for preventing 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 same to the other brake mechanism. A small tape cassette characterized in that the brake piece is provided with a slit into which a test piece of a jig can be inserted, and the jig can be used to inspect and correct the set position of the brake piece. 3. A pair of reel hubs on which a magnetic tape is stretched, and a pair of brake mechanisms for preventing 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 to the brake mechanism. Brake arm concerned and /
Alternatively, a spring support portion is provided on the outer peripheral surface of the shaft portion of the brake piece related to the other brake mechanism that receives the brake arm, the spring support portion being perpendicular to the shaft portion, and the spring can be held perpendicular to the shaft portion. A small tape cassette having the above structure. 4. A pair of reel hubs on which a magnetic tape is stretched, and a pair of brake mechanisms for preventing unnecessary rotation of the pair of reel hubs, respectively. A small tape cassette in which the one brake mechanism and the other brake mechanism are connected to each other so that the brake release operation of the pair of brake mechanisms can be performed in conjunction with each other by transmitting the brake tape to the brake mechanism. A release lever is provided for transmitting the movement of the reel brake release pin to the brake arm related to the one brake mechanism in response to the insertion of the brake release pin, and the brake arm is independent of the outer shape of the reel brake release pin. Small tape cassette characterized by being configured to enable reliable brake release by .