JP2627102B2 - Magnetic tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a pair of tape reels around which a magnetic recording tape is wound, and when the tape is not used, the pair of tape reels is locked. A magnetic tape cassette comprising a cassette housing accommodating a brake member for unlocking the pair of tape reels in conjunction with a member on the tape deck side, more specifically, a magnetic tape cassette mainly containing a VTR magnetic recording tape It is about.

(Prior art) A magnetic tape cassette containing a magnetic recording tape for a VTR (Video Tape Recorder) has a pair of tape reels around which the magnetic recording tape is wound. A brake member is provided for unlocking the pair of tape reels in conjunction with a member on the deck side.

A conventional magnetic tape cassette has a pair of tape reels formed with an uneven portion on the outer periphery of a flange, and a brake member having a claw portion engaging and disengaging from the uneven portion is radially moved toward the center of the tape reel by a spring or the like. In general, the urging force causes the projections and depressions to engage with each other to lock the tape reel.

(Problems to be Solved by the Invention) However, the brake member of the conventional magnetic tape cassette has a weak braking force, and the tape reel is easily moved in the cassette housing. Problems such as easy detachment were observed. With the conventional brake member as described above, if the urging force of a spring or the like is increased to increase the braking force, problems such as exceeding the unlocking force of the unlocking member on the tape deck side are found. Therefore, it has been difficult to solve the above problems.

The present invention has been made in view of the above circumstances, and provides a magnetic tape cassette provided with a brake member capable of locking a tape reel with a high braking force and suppressing movement of the tape reel in a cassette housing. It is intended for.

(Means for Solving the Problems) In order to solve the above problems, a magnetic tape cassette according to the present invention includes: a pair of tape reels around which a magnetic recording tape is wound;
A cassette housing for accommodating the pair of tape reels, wherein a bottom surface of the cassette housing is provided with a lock release hole through which a lock release member of the tape deck enters when a magnetic tape cassette is loaded on the tape deck. In the tape cassette, the pair of tape reels includes an engaging portion including a plurality of concave portions provided along an outer peripheral portion of the flange, and the tape housing includes a tape near the pair of tape reels in the cassette housing. A brake member having a locking claw portion that engages with and disengages from the locking portion of the reel and a substantially V-shaped expanding portion is pivotally supported, and the brake member is provided near the brake member. A lock slider having a substantially wedge-shaped pressing portion for pressing the expanding portion is moved into the expanding portion and retracted from the expanding portion. The lock slider is urged toward the entry position, and is movable to the retreat position by upward movement of the lock release member that has entered through the lock release hole. In accordance with the movement of the lock slider between the entry position and the retreat position, the lock claw portion of the brake member is configured to engage and disengage with the locking portion of the tape reel. It is assumed that.

Here, "the pair of tape reels includes a locking portion composed of a large number of concave portions provided along the outer peripheral portion of the flange" means, for example, as in a conventionally generally used tape reel. Engage with the convex part of the brake member, such as one with an uneven part formed on the outer peripheral part of the flange, or one with a large number of concave parts formed along the outer peripheral edge of the tape reel on the surface near the outer periphery of the flange of the tape reel. The tape reel is provided with a large number of detachable concave portions on the outer peripheral portion of the flange.

(Operation and Effect) As described above, the magnetic tape cassette according to the present invention includes a pair of tape reels around which the magnetic recording tape is wound.
The cassette housing for accommodating the pair of tape reels includes an engaging portion including a plurality of concave portions provided along the outer periphery of the flange. A lock claw that engages with and disengages from the stop;
A brake member having a U-shaped push-up portion is pivotally supported. In the vicinity of the brake member, there is a substantially wedge-shaped press portion that presses the push-up portion of the brake member. A lock slider is provided so as to be movable between a position of entering the expanding portion and a position of retreating from the expanding portion. The lock slider is urged toward the entering position, and is provided on a bottom surface of the cassette housing. The upward movement of the unlocking member on the tape deck side that has entered through the unlocking hole enables the tape slider to be moved to the retreat position. Since the lock claw portion is configured to engage and disengage with the locking portion of the tape reel, it is formed in a substantially wedge shape of the lock slider biased by a spring or the like. Pressure section presses the 押拡 portion of the brake member formed in a substantially V-shape, by the action of a force pushing the push widened part to the locking claw portion of the brake member can lock the tape reels. For this reason, the brake member of the magnetic tape cassette of the present invention exerts a large braking force due to the wedge effect even if the urging force on the lock slider is substantially the same as the urging force on the conventional brake member. It is possible to do.

Therefore, the magnetic tape cassette of the present invention has the above-mentioned problem caused by the weak braking force of the brake member, which is seen in the conventional magnetic tape cassette, that is, the tape reel is easy to move in the cassette housing. It is possible to solve the problem that the housing is worn or the lock is easily released.

As described above, the magnetic tape cassette according to the present invention utilizes the wedge effect, locks the tape reel with high braking force, makes it difficult to release the lock, and suppresses the movement of the tape reel in the cassette housing. And the cassette housing can be prevented from being worn.

(Examples) Details of the magnetic tape cassette according to the present invention will be described below based on examples.

FIG. 1 is a plan view showing the internal structure of the magnetic tape cassette according to the present invention, FIG. 2A is a plan view showing the configuration when the brake member is locked, and FIG. 2B is a plan view showing the configuration when the lock is released. FIG. 3A is a cross-sectional view taken along the line IIIa-IIIa in FIG. 2A, FIG. 3B is a cross-sectional view taken along the line IIIb-IIIb in FIG. 2B, and FIG. 4A shows a configuration when the brake member is locked. FIG. 4B is a perspective view showing the configuration when the lock is released.

As shown in FIG. 1, a magnetic tape cassette according to the present invention comprises a pair of tape reels 2 on which a magnetic recording tape 3 is wound.
a, 2b and the brake member 4 are housed in the cassette housing 1. In the present embodiment, the pair of tape reels 2a and 2b have an uneven locking portion 6 on the outer periphery of the flanges 5a and 5b. This is commonly seen in the past.

As shown in FIGS. 4A and 4B, the brake member 4 has lock claws 7a and 7b that engage with and disengage from the locking portion 6, and a push-up portion 8 formed in a substantially V shape. And is supported by the cassette housing 1.

In the vicinity of the brake member 4, a lock slider 9 is slidably supported by the cassette housing 1 by means not shown. The lock slider 9 is urged by a spring 10 in the direction of arrow A in FIGS. 4A and 4B. The lock slider 9 has a substantially wedge-shaped pressing portion for pressing and expanding the expanding portion 8 of the brake member 4.
It has eleven.

When the magnetic tape cassette is not used, the lock slider 9 slides in the direction of arrow A in FIG. 4A by the urging force of the spring 10 as shown in FIG. 4A, and the pressing force 11 causes the pressing portion of the brake member 4 to expand. 8 is pushed to spread the expanding portion 8 in the direction C in the figure. At this time, the lock claws 7a and 7b of the brake member 4
The tape reels 2a and 2b are securely locked by engaging with the locking portions 6. When the magnetic tape cassette is used, the lock slider 9 slides in the direction of arrow B in conjunction with the lock releasing member 12 on the tape deck side, as shown in FIG. 4B. At this time, the pressing portion 11 of the lock slider 9 is separated from the push-up portion 8 of the brake member 4, and the brake release bars 13a, 13b provided on the lock slider 9 are moved by the brake members 4a.
Is pressed, and the expanded portion 8 is moved in the direction of arrow D in FIG. 4B. At the same time, the locking claw portion of the brake member 4
7a, 7b are detached from the locking portion 6, and are tape reels 2a, 2b.
Is unlocked.

The operation of the lock slider 9 will be described in detail with reference to FIGS. 2A to 3B.

As shown in FIG. 2A, the lock slider 9 at the time of locking is urged by a spring 10 in the direction of arrow A in the figure, and the pressing portion 10 of the lock slider 9 presses the expanding portion 8 of the brake member 4,
It stops at the pressing position in the figure. As shown in FIG. 3A, the lock slider 9 is provided with an insertion hole 14 into which the lock release member 12 on the tape deck side is inserted. This insertion hole 14
As shown in FIG. 3A, an inclined portion 16 is provided inside. The position of the lock slider 9 at the time of locking is set so that the relationship with the position of the lock release hole 15 at the bottom of the cassette housing is as shown in FIG. 3A.

When the magnetic tape cassette is loaded on the tape deck, the unlocking member 12 on the tape deck side enters through the unlocking hole 15. At this time, the tip of the unlocking member 12 is
Press 16 In conjunction with the upward movement of the unlocking member 12, the lock slider 9 for pressing the inclined portion 16 against the tip of the unlocking member 12 is slid in the direction of arrow B as shown in FIG. 3B. . At the same time, the brake release bars 13a, 13b of the lock slider 9 press the push-up portion 8 of the brake member 4 to move the push-up portion 8 in the direction of arrow D in FIG. unlock.

The feature of the present invention is that the urging force of the spring 10 on the lock slider 9 is applied to the brake member 4 by a wedge effect,
Thus, a large braking force can be obtained. In this embodiment, in order to enhance the wedge effect of the lock slider 9, the shapes of the brake member 4 and the lock slider 9 are devised, and this point will be described below. FIG. 5 is a partially enlarged plan view showing the operation of the brake member on the lock slider during locking.

As shown in FIG. 5, the brake member 4 and the lock slider 9 of the present embodiment include an extension line P extending along the contact surface 4a of the brake member 4 that contacts the inclined surface 9a of the lock slider 9 during locking. An angle α formed by a straight line Q extending parallel to the moving direction of the lock slider 9 passes through a rotation center O of the brake member 4 and intersects a straight line R intersecting an arbitrary point X on the inclined surface 9a of the lock slider 9; The angle β is smaller than the angle β. By doing this,
A force is applied to the brake member 4 from the tape reel (not shown) in a direction for unlocking the brake member 4, and the force is applied to the brake member 4 at the point X on the inclined surface 9 a of the lock slider 9 by the force. Even when a force F in the direction perpendicular to the inclined surface 9a acts, the force F is applied to the component F _{1 in} the direction along the turning radius OX of the brake member 4 at the point X.
If, when decomposed into the rotation radius OX direction perpendicular component F _2, to the pressing direction, i.e., the lock slider downward in FIG facing the rotation center O of the components F ₁ direction always braking member 4 As is clear from the fact that the direction is the same (this is the same for the other arm portion of the brake member 4 not shown), the lock slider 9 is hardly disengaged from the brake member 4, that is, the wedge effect by the lock slider 9. Is being improved.

Although the details of the magnetic tape cassette according to the present invention have been described based on one embodiment, the magnetic tape cassette according to the present invention is not limited to the embodiment. For example, in the above embodiment, the brake member is composed of two members. However, it is also possible to use an elastic material to form one member, and in this case, the configuration of the brake member 4 is simplified. Can reduce costs.
Further effects can be obtained. Further, in the above-described embodiment, the locking portion 6 having a concave and convex shape generally seen in the related art is provided on the outer peripheral portion of the flange of the tape reel.
May be formed on the surface near the outer periphery of the flange along the outer peripheral edge of the tape reel from a large number of recesses arranged in a row. Hereinafter, an embodiment in which the locking portion has such a configuration will be described in detail.

FIG. 6A is a perspective view showing a configuration when a brake member is locked in an embodiment different from the above-described embodiment, and FIG. 6B is a perspective view showing a configuration when the lock is released.

As shown in FIG. 6A, the tape reel has its flange 5
On the surface near the outer periphery of a ', 5b', there is provided a locking portion 6 'formed by a number of concave portions arranged in a line along the outer periphery of the tape reel. The brake member 4 ′ includes the locking portion 6 ′, lock claw portions 7 a ′ and 7 b ′ that engage and disengage,
And a push-up portion 8 'formed substantially in a V-shape, and is shown in the cassette housing 1' as shown.

In the vicinity of the brake member 4 ', a lock slider 9' is pivotally supported by the cassette housing 1 'as shown.
This lock slider 9 'is moved by a spring 10' in FIG.
It is biased downward in FIG. 6B. Further, the lock slider 9 'has a pressing portion 11' formed in a substantially wedge shape for pressing and expanding the expanding portion 8 'of the brake member 4'.

When the magnetic tape cassette is not used, the lock slider 9 'is urged downward in FIG. 6A by a spring 10' as shown in FIG. 6A, and the pressing portion 11 'is a push-in portion 8 of the brake member 4'. ′ To expand the expanded portion 8 ′ in the direction C ′ in the figure. At this time, the lock claws 7a ', 7 of the brake member 4'
b 'engages with the locking portion 6' to securely lock the tape reel. When the magnetic tape cassette is used, the lock slider 9 'moves upward in conjunction with the lock release member 12' of the tape deck as shown in FIG. 6B. At this time, the pressing portion 11 'of the lock slider 9' separates from the expanding portion 8 'of the brake member 4', and the brake release bars 13a ', 13b' provided on the lock slider 9 '
The pushing portion 8 'of the brake member 4' is pressed to move the pushing portion 8 'in the direction of the arrow D' in FIG. 6B. At the same time, the lock claws 7a 'and 7b' of the brake member 4 'are disengaged from the locking portion 6' and the lock of the tape reel is released.

Even in this case, the urging force of the spring 10 'applied to the lock slider 9' acts on the brake member 4 'by a wedge effect, whereby a large braking force can be obtained. Further, in this case, a further effect is obtained such that the movement of the tape reel in the cassette housing can be almost completely suppressed.

As described above, the embodiment of the magnetic tape cassette according to the present invention can be variously modified without impairing the above-described effects.

[Brief description of the drawings]

FIG. 1 is a plan view showing the internal configuration of an embodiment of a magnetic tape cassette according to the present invention, FIG. 2A is a plan view showing the configuration when the brake member is locked, and FIG. FIG. 3A is a plan view showing the configuration of FIG.
Ia-IIIa sectional view, FIG. 3B is a sectional view taken along the line IIIb-IIIb of FIG. 2B, FIG. 4A is a perspective view showing the configuration when the brake member is locked, and FIG. FIG. 5 is a partially enlarged plan view showing the action of the brake member on the lock slider during locking, and FIG. 6A is a perspective view of the brake member according to another embodiment of the magnetic tape cassette according to the present invention. FIG. 6B is a perspective view showing a configuration at the time of locking, and FIG. 6B is a perspective view showing a configuration at the time of unlocking. 1 ... cassette housing, 2a, 2b ... tape reel 3 ... magnetic recording tape 4, 4 '... brake member 5a, 5b, 5a', 5b '... tape reel flange 6, 6' ... locking Part 7a, 7b, 7a ', 7b' ... Lock claw part 8, 8 '... Enlargement part 9, 9' ... Lock slider 10, 10 '... Spring, 11, 11' ... Press part 12, 12 ': Lock release member 13a, 13b, 13a', 13b ': Brake release bar 14: Insertion hole 15, 15': Lock release hole, 16: Inclined part A, B: Lock slider moving direction C, D …… moving direction

Claims (1)

(57) [Claims] 1. A magnetic tape cassette comprising: a pair of tape reels wound with a magnetic recording tape; and a cassette housing for accommodating the pair of tape reels. A magnetic tape cassette is mounted on a tape deck on the bottom surface of the cassette housing. ,
In a magnetic tape cassette provided with an unlocking hole into which an unlocking member on the tape deck side enters, the pair of tape reels includes an engaging portion including a plurality of concave portions provided along an outer peripheral portion of the flange. In the cassette housing, near the pair of tape reels, there were provided a lock claw portion engaging / disengaging with the locking portion of the tape reel, and a substantially V-shaped expanding portion. A position where a lock slider having a substantially wedge-shaped pressing portion for pressing the expanding portion of the brake member enters the expanding portion is provided near the brake member. The lock slider is biased toward the entry position, and the lock slider of the lock release member that has entered through the lock release hole is provided so as to be movable to a position where the lock release member retreats from the push-in portion. The upward movement allows the lock slider to move to the retreat position. In conjunction with the movement of the lock slider between the entry position and the retreat position, the lock claw portion of the brake member engages with the locking portion of the tape reel. A magnetic tape cassette characterized in that it is configured to be separated from and separated from each other.