JPH11203820A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette capable of preventing the winding looseness of the magnetic tape when the magnetic tape cassette is dropped. SOLUTION: A reel locking member 10 is provided with a slide body part 11 arranged between a pair of reels 3, 4 so as freely to slide and a pair of restraining arms 14, 15 projectedly provided on the slide body part 11 to engage with each lower flange 5, 6, and also the slide body part 11 is pressed by a compression coil spring 24 so that these restraining arms 14, 15 are slidable in the direction engaging with each of the lower flanges 5, 6. Hinge parts 12, 13 are provided on a pair of restraining arms 14, 15 for connecting tip end engaging parts 14a, 15a with the slide body part 11 so as capable of rocking. On the lower cassette half 2, corner parts 17a, 18a of partitions 17, 18 and stopper pins 20, 21 are provided for controlling the rocking amount of the tip end engaging parts 14a, 15a by means of abutting on the restraining arms 14, 15 in between the tip end engaging parts 14a, 15a and the hinge parts 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette suitable for application to a video tape cassette and the like.
More specifically, the present invention relates to a magnetic tape cassette having an improved reel lock member that engages with a flange of a reel on which a magnetic tape is wound to prevent rotation of the reel.

[0002]

2. Description of the Related Art There are various types of conventional magnetic tape cassettes. For example, a video tape cassette 60 whose internal structure is shown in FIG. A pair of reels 62 and 63 are rotatably disposed in 61, and the magnetic tape 6 is attached to both reels 62 and 63.
5 are wound. The magnetic tape 65 is provided at the front (upper side in the figure) of the cassette and at the left and right sides of the tape guides 66 and 6.
7 and passes through an opening 68 on the front side of the lower cassette half 61. Engaging teeth 70a, 71a are formed on the entire periphery of the lower flanges 70, 71 of the reels 62, 63.

On the other hand, when the video tape cassette 60 is not loaded in a video deck (not shown), that is, when the cassette is stored or carried, the magnetic tape 65 is prevented from loosening at the rear of the cassette. And a reel lock member 75 for preventing rotation of the reels 62 and 63 in a substantially triangular space 73 formed between the reels.
Is arranged.

A substantially triangular partition wall 76, 7 is provided between the rear plate portion 61a of the lower cassette half 61 and the reels 62, 63.
7 are provided. The straight portions 7 of these partition walls 76 and 77
6a and 77a are arranged to face each other, and these linear portions 76a and 77a
The reel lock member 75 is slidably inserted between 77a. The reel lock member 75 is urged toward the front of the cassette by an urging force of a torsion coil spring 81 appropriately supported by a support shaft 80 projecting from the bottom wall surface of the lower cassette half 61. This torsion coil spring 81
The coil portion is penetrated by the support shaft 80, and one end is
And the other end engages with the rear surface of the reel lock member 75. And this reel lock member 7
5 is provided with an insertion hole 82 for inserting a lock release pin (not shown) of the video deck.
A reel lock member 7 is provided on the bottom wall of the lower cassette half 61.
An opening (not shown) corresponding to the fifth insertion hole 82 is provided.

The reel lock member 75 is made of, for example, a resin having an appropriate elasticity, and is provided with a rectangular slide body 83 having a relatively large bottom area for stable sliding. On the front end surface of the slide body 83, locking arms 84, 85 which can be engaged with engaging teeth 70a, 71a formed on the lower flanges 70, 71 are integrally formed.

[0006]

However, when the above-described magnetic tape cassette 60 is dropped, for example, when the reels 62 and 63 move by the impact force of the drop and press the pair of locking arms 84 and 85, This pressing force is transmitted to the slide body 83, and the slide body 83 moves to the unlocked position against the urging force of the torsion coil spring 81, so that the locking arms 84, 85 move the reels 62, 63.
May be separated from the engaging teeth 70a, 71a.
Therefore, the reels 62 and 63 rotate, and the reel 6
There is a problem that the magnetic tape 65 wound around 2, 63 becomes loose. Therefore, an object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic tape cassette that can prevent the magnetic tape cassette from loosening when the magnetic tape cassette falls.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a pair of reels rotatably mounted by winding a magnetic tape in a cassette case, and rotating the reels by engaging the flanges of the reels. And a reel lock member for preventing the sliding of the slide cylinder, wherein the reel lock member is slidably disposed between the pair of reels, and the slide cylinder is engaged with the flanges. And a pair of locking arms protruding from the portion. The sliding body is urged by a spring member so that the locking arms can slide in a direction to engage with the flange. Is provided with a hinge portion for pivotally connecting a leading end engaging portion to the slide body portion, and at least one of the cassette case or the pair of locking arms has a front portion. A first stopper portion is provided for restricting the amount of inward swing of the tip engaging portion by abutting each other between the tip engaging portion and the hinge portion, and the cassette case or the pair of locking members is provided. At least one of the arms is provided with a second stopper portion that restricts the amount of outward swing of the distal end engaging portion by contacting the distal end engaging portion and the hinge portion of the locking arm with each other. This is achieved by a magnetic tape cassette.

It is another object of the present invention to provide a pair of reels which are rotatably mounted by winding a magnetic tape in a cassette case, and a reel which engages with a flange of the reel to prevent the reel from rotating. A magnetic tape cassette having a lock member, wherein the reel lock member is slidably disposed between the pair of reels, and protrudes from the slide body to engage with each of the flanges. A pair of locking arms, and the sliding body is urged by a spring member so that the locking arms can slide in a direction of engaging with the flange. A hinge portion for pivotally connecting the tip engagement portion to the slide body is provided, and at least one of the slide body or the pair of locking arms is provided with:
A first stopper portion that regulates the amount of inward swing of the distal end engaging portion by contacting the distal end engaging portion and the hinge portion with each other is provided, and the cassette case or the pair of engaging members is provided. At least one of the stop arms is provided with a second stopper portion that regulates the amount of outward swing of the distal end engaging portion by abutting on the distal end engaging portion and the hinge portion of the locking arm. This is achieved by a magnetic tape cassette.

According to the above constructions, when the magnetic tape cassette falls, each of the reels moves within the cassette case by the impact force of the fall and the locking arm of the reel lock member is pressed in the unlocking direction. With this pressing force, the distal end engaging portion of each locking arm swings outward or inward from the hinge portion. Then, when the distal end engaging portion of each locking arm swings by a predetermined amount, each locking arm comes into contact with the first or second stopper portion provided on the cassette case or the reel lock member, and the swing is regulated. You.

That is, the first and second stopper portions can receive the pressing force of each reel acting via the tip engaging portion of each arm, and the pressing force of each reel is applied to the slide body. Direct transmission can be prevented. This allows the reel lock member to minimize the amount of sliding of the slide body in the unlocking direction against the urging force of the spring member, and the pair of locking arms is engaged with each flange. State can be maintained.

Preferably, at least one of the slide body and the pair of locking arms of the reel lock member abuts on the slide body between the tip engaging portion and the hinge. Thus, a regulating protrusion for regulating the amount of inward fall of the locking arm is provided.
According to the reel lock member having the restricting projection, the amount of inward fall of the locking arm can be restricted when the reel lock member is formed or when components are accumulated, and the hinge portion of the reel lock member is positioned inside. It can be prevented from being excessively bent.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a video tape cassette according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, in a video tape cassette 1 according to the present invention, a pair of reels 3 and 4 can rotate in a lower cassette half 2 (a state in which an upper cassette half is removed) constituting a cassette case. , And a magnetic tape (not shown) is wound around both reels. On the periphery of the lower flanges 5, 6 of the reels 3, 4,
Engaging teeth 5a and 6a are formed over the entire circumference.

On the other hand, when the video tape cassette 1 is not loaded in a video deck (not shown), a substantially triangular space formed between the reels 3 and 4 is provided to prevent the magnetic tape from being loosened. 8, the lower flanges 5, 6
And a reel lock member 10 that engages with the engaging teeth 5a and 6a to prevent reel rotation. The operation of each part other than the reel lock member 10 is the same as that of the conventional video tape cassette 50 described with reference to FIG. 7, and the description is omitted here.

The reel lock member 10 is formed of, for example, a synthetic resin, and has a slide body 11 slidably disposed between the pair of reels 3 and 4 and engagement teeth of the lower flanges 5 and 6. A pair of locking arms 14 and 15 projecting from the slide body 11 to engage with 5a and 6a, respectively, and these locking arms 14 and 15 are engaged with the lower flanges 5 and 6, respectively. The slide body 11 is urged by a compression coil spring 24 as a spring member so as to be able to slide in the direction.

A release pin insertion portion 11a is provided on the lower surface of the slide body portion 11, and a guide portion 1 is provided on the rear side.
1b is provided. As will be described later, when the video tape cassette 1 is mounted on the video deck, the slide body 11 pushed by the unlocking pin (not shown) of the video deck retreats, thereby locking the reels 3 and 4. Is released. The slide body 1
1 is slidably fitted into the guide members 27 and 28 of the lower cassette half 2 and has guide rails 29 and 30 of the lower cassette half 2 on the lower end surface of the guide portion 11b.
Is slidably fitted in Thereby, the slide body 11 slides linearly.

Locking arms 14 and 15 protruding from both sides of the slide body 11 have front end engaging portions 14a and 15 respectively.
Thin hinge portions 12 and 13 for swingably connecting the a with the slide body portion 11 are provided. That is, the locking arms 14 and 15 are connected to the distal end engagement portions 14a and 1 of each arm.
When a predetermined pressure or more is received from each of the reels 3 and 4 via 5a, the reels 3 and 4 can swing outward (in the direction of arrow A) or inward (in the direction of arrow B) with the hinges 12 and 13 as fulcrums. In addition, the locking arms 14 and 15 are provided with a front end engaging portion 14.
The reels 3 and 4 are bent at an appropriate angle toward the center of the reels 3 and 4 so that the reels 3 and 4 can reliably engage with the engaging teeth 5a and 6a of the reels 3 and 4.

On the bottom wall surface of the lower half cassette 2, arc-shaped partition walls 17, 18 for restricting the movement of the reels 3, 4 in the radial direction are provided so as to project therefrom.
The corners 17a, 18a of the partition walls 17, 18 located near the outside of the front end 15 are respectively engaged with the distal end engaging portions 14a, 15a.
The locking arms 14, 1 between the
5 by contact with the front end engaging portions 14a, 15a.
Is a second stopper portion for regulating the swing amount outward (in the direction of arrow A). Also, the locking arms 14, 15
Stopper pins 20 and 21 project from the bottom wall surface of the lower half cassette 2 located in the vicinity of the inside of the lower half cassette 2, and respectively engage with tip end engaging portions 14 a and 15 a and hinge portions 12 and 13.
Abuts on the locking arms 14 and 15 between the front end engagement portions 14a and 15a (in the direction of arrow B).
The first stopper portion regulates the amount of swing to the first stopper.

In the present embodiment, the second stopper portion for regulating the swing amount of the tip engaging portions 14a and 15a to the outside (in the direction of arrow A) is provided by the corner portions 17a and 17a of the partition walls 17 and 18. 18a is extended to the vicinity of the outside of the locking arms 14, 15, but instead of this, for example, stopper pins or ribs independent of the partition walls 17, 18 like the stopper pins 20, 21 are provided. The lower cassette half 2 may be provided.

The lower cassette half 2 is provided with a substantially triangular stopper 32 for regulating the amount of forward movement of the slide body 11. When the slide body 11 is in contact with the stopper 32, the locking arms 14, 1
5 is securely engaged with the engaging teeth 5a, 6a of the reels 3, 4, and the rotation of the reels 3, 4 is reliably prevented. Further, a pin insertion hole 2a for inserting a lock release pin of the video deck is provided in the lower cassette half 2 behind the stopper 32 so as to correspond to the release pin insertion portion 11a of the slide body 11. I have.

Next, the operation of the reel lock member 10 of the video tape cassette 1 according to the present invention will be described with reference to FIGS. FIG. 1 shows a state where the video tape cassette 1 is not loaded in the video deck. The reel lock member 10 urged by the compression coil spring 24 in a direction in which it engages the lower flanges 5 and 6 includes locking arms 14 and 15.
Are engaged with the engaging teeth 5a, 6a of the reels 3, 4 to prevent the reels 3, 4 from rotating.
At this time, the front end engaging portions 14a and 15a do not swing around the hinge portions 12 and 13, and securely engage with the engaging teeth 5a and 6a of each of the reels 3 and 4.

FIG. 2 shows a state where the video tape cassette 1 has fallen in parallel. Reel 3, 4 by the impact force due to falling
Moves in the direction of arrow C in the cassette case, the pressing force from the reels 3 and 4 exceeds a predetermined level.
At the same time, the slide body 11 momentarily slides slightly in the unlocking direction (the direction of arrow D), and at the same time, the distal end engaging portions 14a and 15a of the locking arms 14 and 15
It swings outward (in the direction of arrow A) with reference to 2 and 13 as fulcrums.

When the leading end engaging portions 14a, 15a of the locking arms 14, 15 are swung by a predetermined amount in a state of being engaged with the engaging teeth 5a, 6a of the reels 3, 4, these locking arms 14 , 15 are corner portions 17a, 1 of the partition walls 17, 18, which are second stopper portions provided on the lower cassette half 2.
8a, the swing is regulated. That is, the corner 17
a, 18a can receive the pressing force of each of the reels 3, 4 acting via the distal end engaging portions 14a, 15a of each arm, and the pressing force of each of the reels 3, 4 is applied to the slide body 11
Can be prevented from being transmitted directly. Accordingly, the reel lock member 10 can minimize the amount of sliding of the slide body 11 in the unlocking direction against the urging force of the compression coil spring 24, and the pair of locking arms 14, 1
5 can be kept in a state of being engaged with the engagement teeth 5a and 6a.

FIG. 3 shows a state in which the video tape cassette 1 has fallen obliquely. For example, when the reel 4 moves in the direction (arrow E direction) facing the locking arm 15 in the cassette case by an impact force due to dropping, a predetermined or more pressing force from the reel 4 acts on the locking arm 15 and slides. The torso 11 momentarily slides slightly in the unlocking direction (the direction of arrow D) and at the same time
5a is inside with hinge part 13 as a fulcrum (direction of arrow B)
Rocks.

The distal end engaging portion 15 of the locking arm 15
When the lock arm 15 is swung by a predetermined amount in a state where the lock arm 15 is engaged with the engagement teeth 6 a of the reel 4, the locking arm 15 comes into contact with the stopper pin 21 which is a first stopper portion provided on the lower cassette half 2. Oscillation is regulated by contact. That is, the stopper pin 21 can receive the pressing force of the reel 4 acting through the tip engaging portion 15a of the arm, and can prevent the pressing force of the reel 4 from being directly transmitted to the slide body 11. it can. Accordingly, the reel lock member 10 can minimize the amount of sliding of the slide body 11 in the unlocking direction against the urging force of the compression coil spring 24, and the pair of locking arms 14, 15. Are the engagement teeth 5a, 6
a can be kept engaged. In addition, the reel 3 is moved in the cassette case by the impact force due to the drop.
In the case of moving in the direction opposite to the above, the swing of the locking arm 14 is restricted by the stopper pin 20, and similarly, the pressing force of the reel 3 can be prevented from being directly transmitted to the slide body 11.

Therefore, the video tape cassette 1 is
Even when it falls, the engagement between the locking arms 14 and 15 and the engaging teeth 5a and 6a of each reel 3 and 4 is securely held, and the loosening of the magnetic tape can be prevented. still,
When the impact force due to the drop is released, the reel lock member 10 returns to the state shown in FIG. 1 by the elastic restoring force of the hinge portions 12 and 13.

FIG. 4 shows a use state in which the video tape cassette 1 is mounted on a video deck. As shown in the figure, when the slide body 11 is pushed by an unlocking pin (not shown) of the VCR and retreats in the direction of arrow D, the locking arms 14 and 15 move the corners 17a and 18a and the stopper pins 20 and The reel lock member 10 slides to the unlock position without contacting the lock arm 21 so that the locking arms 14 and 15 can be separated from the engaging teeth 5a and 6a of the reels 3 and 4. Therefore, the reels 3 and 4 are rotatable, and are driven to rotate by a rotation drive shaft (not shown) of the video deck.

In the above embodiment, the partition 1
Corners 17a, 18a of 7, 8 and stopper pin 2
0, 21 are provided near the inner and outer sides of the locking arms 14, 15, so that the distal end engaging portions 14a, 15a
The first and second stopper portions for regulating the swing amount of the reel lock member 50 shown in FIG.
As shown in FIG.
Bulge 4 between hinges 2a, 43b and hinges 40, 41
4 and 45 are protruded, and these bulging portions 44 and 45 are used as first stopper portions to abut against the lower cassette half or the slide body, respectively, so that the front end engaging portions 42a and
It is also possible to regulate the amount of swinging inward of 43b. or,
Even when a bulging portion is protruded as a second stopper portion on the outer surface of the locking arm, the amount of swinging of the distal end engaging portion to the outside can be similarly regulated.

That is, by appropriately setting the shape of the bulging portion projecting from the inner and outer surfaces of the locking arm, the first and second stopper portions provided on the lower cassette half can be formed separately as stopper pins. It is not necessary to change the shape of the partition wall, and the magnetic tape cassette according to the present invention can be constituted only by replacing the reel lock member.

Further, the bulging portions 44 and 45 provided inside the locking arms 14 and 15 serve as regulating projections to regulate the amount of inward falling of the locking arms 14 and 15 so that the hinge portions are formed. 40 and 41 can be prevented from being excessively bent inward. Therefore, when the reel lock member 50 is formed or components are accumulated, the locking arm 1
Even when an excessive inward pressing force acts on 4, 4 and 15, the hinge portions 40 and 41 are not excessively bent and permanent deformation does not occur.

FIG. 6 is an enlarged perspective view of a main part of a video tape cassette provided with a reel lock member 51 according to another embodiment of the present invention. Components other than the regulating rib 52 as a regulating projection provided on the reel lock member 51 are shown in FIG.
Has the same configuration as that of the video tape cassette 1 shown in FIG. As shown in FIG. 6, the reel lock member 51 includes a slide body 11 slidably disposed between a pair of reels 3 and 4 (not shown), and lower flanges 5 and 6 of the reels 3 and 4. And a pair of locking arms 14 and 15 protruding from the slide body 11 to be engaged with the engaging teeth 5a and 6a.

Further, the front end engaging portions 14a, 15a and the hinge portions 12, 1 are provided on both side surfaces of the slide body portion 11.
A pair of restricting ribs 52, which are restricting projections for restricting the amount of the locking arms 14 and 15 falling inward by contacting the locking arms 14 and 15 between the control arms 3 and 3, are protrudingly provided. The restricting rib 52 can normally swing within a range where the locking arms 14 and 15 are used in a normal state,
The locking arms 14 and 15 are used as the stopper pins 2.
The protrusion height is appropriately set so as not to hinder contact with 0 and 21.

The regulating rib 52 interferes with the stopper pins 20 and 21 when the slide body 11 is pushed by an unlocking pin (not shown) of the video deck and retreats to the unlocking position. In order to prevent this, the stopper pins 20 and 21 are provided at positions having a clearance X in the thickness direction of the cassette case with respect to the distal ends thereof.

That is, the regulating ribs 52 provided on both side surfaces of the slide body 11 are provided with the locking arms 14, 1.
5 by restricting the amount of inward falling of the hinge portion 1.
2, 13 can be prevented from being excessively bent inward. Therefore, even when an excessive pressing force inwardly acts on the locking arms 14 and 15 at the time of forming the reel lock member 51 or at the time of component accumulation, the hinge portion 1 is not moved.
2, 13 are not bent excessively and do not cause permanent deformation. The amount of swinging of the distal end engaging portions 14a and 15a to the inside can also be regulated by bringing the regulating ribs 52 into contact with the locking arms 14 and 15 as first stopper portions, respectively. In this case, the stopper pins 20 and 21 projecting from the bottom wall surface of the lower half cassette 2 can be omitted.

Further, the magnetic tape cassette of the present invention is not limited to the configurations of the reel lock member and the stopper portion in the above embodiment, but may take various forms, needless to say, the slide body portion and the locking member. The shape of the arm, the shape of the hinge portion, and the shape of the stopper portion can be appropriately changed according to the type of the magnetic tape cassette and the like based on the gist of the present invention.

[0035]

As described above, according to the magnetic tape cassette of the present invention, when the magnetic tape cassette falls, each of the reels moves in the cassette case by the impact force of the fall, and the reel lock member is locked. When the arms are pushed in the unlocking direction, the pushing force causes the distal end engaging portions of the respective locking arms to swing outward or inward from the hinge portions. And
When the distal end engaging portion of each locking arm swings by a predetermined amount, each locking arm comes into contact with the first or second stopper portion provided on the cassette half, and swinging is restricted.

That is, the first and second stopper portions can receive the pressing force of each reel acting through the distal end engaging portion of each arm, and the pressing force of each reel is applied to the slide body. Direct transmission can be prevented. This allows the reel lock member to minimize the amount of sliding of the slide body in the unlocking direction against the urging force of the spring member, and the pair of locking arms is engaged with each flange. State can be maintained. Therefore, even when the video tape cassette falls, the engagement between the locking arm and the engaging teeth of each reel is reliably held, and the loosening of the magnetic tape can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a video tape cassette according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a state where the video tape cassette shown in FIG. 1 has dropped in parallel.

FIG. 3 is an explanatory view showing a state where the video tape cassette shown in FIG. 1 has fallen obliquely.

FIG. 4 is an explanatory diagram of a use state of the video tape cassette shown in FIG.

FIG. 5 is a plan view showing a modification of the reel lock member.

FIG. 6 is an enlarged perspective view of a main part of a video tape cassette provided with a reel lock member according to another embodiment of the present invention.

FIG. 7 is a schematic configuration diagram showing a conventional video tape cassette.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video tape cassette 3, 4 Reel 5, 6 Lower flange 5a, 6a Engagement tooth 11 Slide body part 12, 13 Hinge part 14, 15 Locking arm 17, 18 Partition wall 17a, 18a Corner part 20, 21 Stopper pin 24 Compression Coil spring

Claims (2)

[Claims] 1. A magnetic device comprising: a pair of reels rotatably mounted by winding a magnetic tape in a cassette case; and a reel lock member that engages with a flange of the reel to prevent the reel from rotating. In the tape cassette, the reel lock member includes a slide body slidably disposed between the pair of reels, and a pair of locking arms protruding from the slide body to engage with the flanges. And the slide body is urged by a spring member so that the locking arms can slide in a direction in which the locking arms are engaged with the flange. A hinge portion that swingably connects the slide body portion to the slide body portion. At least one of the cassette case and the pair of locking arms is provided between the tip engagement portion and the hinge portion. A first stopper portion that regulates the amount of inward swinging of the distal end engaging portion by being in contact with each other is provided, and at least one of the cassette case or the pair of locking arms includes the locking arm. A magnetic tape cassette, comprising: a second stopper portion that regulates the amount of swinging of the distal end engaging portion to the outside by being brought into contact with the distal end engaging portion and the hinge portion. 2. A magnetic device comprising: a pair of reels rotatably mounted by winding a magnetic tape in a cassette case; and a reel lock member engaged with a flange of the reel to prevent the reels from rotating. In the tape cassette, the reel lock member includes a slide body slidably disposed between the pair of reels, and a pair of locking arms protruding from the slide body to engage with the flanges. And the slide body is urged by a spring member so that the locking arms can slide in a direction in which the locking arms are engaged with the flange. A hinge portion for swingably connecting the slide body portion to the slide body portion, and at least one of the slide body portion and the pair of locking arms is provided between the tip engagement portion and the hinge portion. A first stopper portion that regulates the amount of inward swing of the distal end engaging portion by contact with the first arm portion, and the locking arm is provided on at least one of the cassette case or the pair of locking arms. A magnetic tape cassette provided with a second stopper portion for restricting the amount of outward swing of the distal end engaging portion by abutting each other between the distal end engaging portion and the hinge portion.