JPH0632190B2 - Tape cassette - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a tape cassette for a video tape recorder, for example, and relates to a tape cassette in which a pair of left and right reels around which tapes are wound are housed in the cassette. is there.

[0002]

SUMMARY OF THE INVENTION According to the present invention, a pair of left and right reels around which a tape is wound are rotatably accommodated in a cassette casing consisting of upper and lower halves, and the lower flanges of the pair of left and right reels are mounted on a reel stand. A pair of left and right reels, each having a pair of left and right reels on which the lower flanges of these reels are mounted on the lower half, are formed by integrally molding the ring portions for mounting. Insert into the table insertion hole,
When the pair of left and right reel stands are inserted into the pair of left and right reel stand insertion holes, the pair of left and right reel stands are mounted on the reel stand by these annular portions, and the lower flange is attached to the lower half. In the tape cassette configured to be floated above, a rib for exclusive use of position regulation of the annular reel is integrally formed on the outer circumference of the annular portion on the lower surfaces of the lower flanges of the pair of left and right reels. When the tape cassette is not used (the pair of left and right reels is placed on the lower half by the lower flange),
The engaging action of the ribs of the pair of left and right reels and the pair of left and right reel base insertion holes restricts the horizontal movement of the pair of left and right reels in the cassette housing due to vibration or shock, When the cassette is in use (a pair of left and right reels is placed on a pair of left and right reel stands), the ribs do not interfere with the lower half or the reel stand so that the cassette is not used. It is possible to prevent damage to these reels and tapes due to horizontal movement of the pair of left and right reels in the cassette housing due to vibration and impact. The reel can be stably driven to rotate.

[0003]

2. Description of the Related Art A conventional example of a tape cassette for a video tape recorder will be described with reference to FIGS.

First, as shown in FIG. 3, a pair of left and right reels 2 around which a magnetic tape 1 is wound are rotatably housed in a cassette housing 3. The magnetic tape 1 is guided by a pair of left and right tape guides 4 provided in the cassette housing 3 and is hung along the inside of a front lid 5 which is openably and closably attached to the cassette housing 3. A pair of left and right reel stand insertion holes 6 and a plurality of positioning pin engagement holes 7 are provided on the bottom surface 3a of the cassette housing 3.

Next, as shown in FIG. 4A, each reel 2
Is made of synthetic resin and is a magnetic tape 1.
Is wound around the outer circumference, and a cylindrical hub 9 around which the magnetic tape 1 is wound around and disk-shaped upper and lower flanges 10 and 11 provided above and below the hub are integrally provided. There is. The reel shaft engaging hole 12 is provided in the lower half of the hub 9.
Is provided on the lower surface 11a of the lower flange 11 at the outer peripheral position of the annular portion 13 for mounting on the reel stand. The cassette housing 3 is composed of upper and lower halves 14 and 15 formed of synthetic resin, and the reel stand insertion hole 6 and the positioning pin engagement hole 7 are provided in the lower half 15. And the upper half 1
A pair of left and right reel pressing spring mechanisms 16 provided below the reels 4 and directly above the respective reels 2 are driven by the spring force.
The central pivot 17 provided on the upper surface of the central portion of the hub 9 is elastically pressed downward.

When the tape cassette is not used,
As shown in FIG. 4 (A), the lower flange 11 of each reel 2 is elastically pressed on the upper surface 15a of the lower half 15 by the spring force of each reel pressing spring mechanism 16 and placed horizontally so that each circle The annular portion 13 is inserted into each reel base insertion hole 6.

On the other hand, in a use state in which the tape cassette is mounted on the video tape recorder and used, as shown in FIG. 4B, a plurality of positioning pin engaging holes 7 on the bottom surface 3a of the cassette housing 3 are provided. The cassette housing 3 is horizontally positioned by being engaged with the positioning pins 19, and the pair of left and right reel stands 20 are relatively inserted from below into the respective reel stand insertion holes 6. Then, each reel 2 is horizontally aligned on the upper surface 20a of the reel base 20 by these annular portions 13 and pushed upward against the spring force of each reel pressing spring mechanism 16, and the lower flange 11 Is floated above the lower half 15. At this time, each reel stand 20
The reel shaft 21 integrally formed in the central portion of the upper surface 20a of each of the reels is provided with the reel shaft engaging holes 1 of the pair of left and right reels 2.
Each reel stand 20 can be driven to rotate through each reel shaft 21 by being inserted into and engaged with each other.

[0008]

In this conventional example, as shown in FIG. 4B, the annular portion 1 of the reel 2 is used.
3, the outer diameter D1 of the reel stand 20 is smaller than the outer diameter D2 of the reel stand 20, while the inner diameter D3 of the reel stand insertion hole 6 is larger than the reel stand 20.
The outer diameter D2 is larger than the outer diameter D2, and a large gap g1 is formed between the outer peripheral surface 13a of the annular portion 13 and the peripheral surface 6a of the reel stand insertion hole 6. This is the molding of the reel 2, the cassette housing 3, the reel base insertion hole 6, the positioning pin engagement hole 7, the reel shaft engagement hole 12, the annular portion 13, the positioning pin 19, the reel base 20 and the reel shaft 21. In consideration of the dimensional tolerance of processing and assembly, the verticality of the reel base and the reel shaft 21 and the center runout, the reel base 20 is inserted into the reel base insertion hole 6 with a sufficient margin, and The annular portion 13 is stably and horizontally placed on the upper surface 20a of the reel base 20 with a sufficient margin, and when the reel base 20 rotationally drives the reel base 20, the annular shape of the reel base 20 and the reel 2 This is to prevent the portion 13 from interfering with the peripheral surface 6a of the reel stand insertion hole 6.

On the other hand, however, in order to reduce the size and weight of the tape cassette, the outer diameter of the cassette housing 3 and the distance between the pair of left and right reels 2 have to be made as small as possible. (B), the outermost peripheral portion of the reel 2 (refers to the outer peripheral surfaces of the upper and lower flanges 10 and 11, but when the winding diameter of the magnetic tape 1 is maximum, it may be the outer peripheral surface of the winding diameter). 23 and the wall surface inside the cassette housing 3 (the arc-shaped wall formed integrally with the upper and lower halves 14 and 15 along the inner peripheral surface of the outer peripheral wall of the cassette housing 3 and the outer peripheries of the upper and lower flanges 10 and 11). In the actual situation, only a very small gap g2 can be formed between the first and second reels 2 and the pair of left and right reels 2.

As a result of the above, in this conventional example, as indicated by the alternate long and short dash line in FIG. 4A, the cassette housing 3 is subjected to horizontal vibration (direction of arrow a) and impact in the non-use state. Then, the reel 2 that tries to move freely in the direction of the arrow a in the cassette housing 3 by the large gap g1 collides with the wall surface 24 in the cassette housing 3 and the reels 2 at the outermost peripheral portion 23. It was And in this way reel 2
When the collision portion of the reel 2 is the outermost peripheral portion 23 of the reel 2,
Also, the magnetic tape 1 is apt to be significantly damaged, and the winding disorder of the magnetic tape 1 is likely to occur. That is, since the upper and lower flanges 10 and 11 of the reel 2 are made of synthetic resin and have a relatively thin thickness and low rigidity, the outermost peripheral portions 23 of the upper and lower flanges 10 and 11 are impacted. ,
The upper and lower flanges 10 and 11 are easily bent or cracked.

When the upper and lower flanges 10 and 11 are bent, the magnetic tape 1 wound between them is pressed from above and below, and the upper and lower edges of the magnetic tape 1 are damaged or winding disorder occurs. Further, in particular, when the winding diameter of the magnetic tape 1 wound on one reel 2 becomes maximum, the upper or lower flange 1 of the other reel 2 is attached to the outermost peripheral portion 23 of the winding diameter.
The outermost peripheral portions 23 of 0 and 11 may collide with each other, and at this time, the magnetic tape 1 is likely to be significantly damaged and winding disorder is likely to occur.

According to the present invention, when the tape cassette is not in use, a pair of left and right reels in the cassette housing are largely moved in the horizontal direction due to vibration or shock, and these reels are walled in the cassette housing at their outermost peripheral portions. It is possible to prevent collision between reels and reels. Moreover, when the tape cassette is in use, it is possible to mount the pair of left and right reels on the pair of left and right reel stands and to stably drive the rotation of each reel by each reel stand with a very simple structure. It's something you want to achieve.

[0013]

According to the present invention, in the above-described tape cassette, an annular position regulating rib is integrally formed on the outer circumference of the annular portion on the lower surfaces of the lower flanges of the pair of left and right reels. The ribs are formed by molding and the protruding length of the ribs is made smaller than the protruding length of the annular portion downward from the lower surface of the lower flange, and the peripheral surfaces of the pair of left and right reel stand insertion holes are almost the same. The upper half is formed into an annular tapered surface whose diameter gradually increases upward, and the lower half is formed into a vertical cylindrical surface, and the lower flanges of the pair of left and right reels are mounted on the lower half. In the state in which the ribs are placed, by inserting the rib together with the annular portion into the pair of left and right reel base insertion holes, the lower ends of the vertical cylindrical surfaces of the outer periphery of these ribs are located below the reel base insertion hole. Inside a half vertical cylindrical surface So as to face in the horizontal direction is clearance,
These ribs are configured to regulate the horizontal position of the reel in the reel base insertion hole, and the pair of left and right reel bases are inserted into the pair of left and right reel base insertion holes to form the pair of left and right reels. When the reel is mounted on the reel stand by these annular portions, a large gap is formed between the lower end of the vertical cylindrical surface of the outer periphery of the rib and the taper surface of the upper half of the reel stand insertion hole. Is formed.

[0014]

The present invention, when the tape cassette is not used,
Due to the engagement between the ribs of the pair of left and right reels and the pair of left and right reel stand insertion holes, the horizontal movement of the pair of left and right reels in the cassette housing is restricted within the pair of left and right reel stand insertion holes. Therefore, it is possible to prevent the reels from colliding with each other at the outermost peripheral portions thereof on the wall surface in the cassette housing or between the reels.

In addition, since the ribs of the pair of left and right reels do not interfere with the lower half or the pair of left and right reel stands when the tape cassette is in use, the pair of left and right reels are always horizontally placed on the pair of left and right reel stands. In addition to being able to be stably mounted (placed), it is possible to always stably rotate the reels by the reel stands. Further, since the ribs can be formed on the lower flange with synthetic resin very easily, the tapered surfaces of the pair of left and right reel stand insertion holes of the lower half can also be formed with synthetic resin very easily. Very simple in structure and manufacturing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tape cassette for a video tape recorder to which the present invention is applied will be described below with reference to FIGS. The same structural parts as those of the conventional example described with reference to FIGS. 3 to 4 are designated by the same reference numerals and the description thereof is omitted.

According to the present invention, the annular portions 1 for mounting on the reel stand are formed on the lower surfaces 11a of the lower flanges 11 of the pair of left and right reels 2.
The position-regulating ribs 26 having an annular shape are integrally formed and provided on the outer periphery of 3. As shown in FIG. 2A, the annular portion 1 extending downward from the lower surface 11a of the lower flange 1
The protrusion length h2 of the rib 26 is smaller than the protrusion length h1 of No. 3 of FIG.

Further, according to the present invention, the peripheral surfaces 6a of the pair of left and right reel base insertion holes 6 are formed into an annular taper surface 27 whose diameter is gradually increased upward in the upper half, and Half is formed on a vertical cylindrical surface 28. The rib 26
The outer circumference of is also formed as a vertical cylindrical surface 29, but at the lower end thereof is formed an annular tapered surface 30 whose diameter is gradually reduced downward.

According to the present invention, when the tape cassette is not in use, as shown in FIGS. 1A and 2A, the spring force of each reel pressing spring mechanism 16 is the same as in the conventional example. The bottom flange 11 of each reel 2
5 is elastically pressed and placed horizontally on the upper surface 15a, and at this time, each rib 26 is inserted into each reel base insertion hole 6 together with each annular portion 13. Then, the lower end 29a of the vertical cylindrical surface 29 on the outer periphery of the rib 26 is attached to each reel base insertion hole 6
The vertical cylindrical surface 28 in the lower half of the upper surface is overlapped by a height h3 to form a small gap g3 between the cylindrical surfaces 29 and 28, which is the maximum gap of the reel 2 described above. The gap is sufficiently smaller than the gap g2 between the outer peripheral portion 23 and the wall surface 24 in the cassette housing 3 and between the pair of left and right reels 2.

Therefore, according to the present invention, as shown by the alternate long and short dash line in FIGS. 1A and 2A, each reel 2 in the cassette housing 3 is vibrated or shocked in the non-use state.
Is moved in the horizontal direction (direction of arrow a), the gap g
When the gap g3 smaller than 2 is moved, the cylindrical surface 29 of each rib 26 immediately becomes the cylindrical surface 28 of each reel stand insertion hole 6.
And the further movement of the reel 2 is restricted.
Therefore, it is possible to prevent the reels 2 from colliding with each other at the outermost peripheral portion 23 between the wall surface 24 in the cassette housing 3 and the reels 2.

Further, according to the present invention, when the tape cassette is in use, as shown in FIGS. 1 (B) and 2 (B), a pair of left and right is inserted in each reel base insertion hole 6 as in the conventional example. Of the reel stand 20 is relatively inserted from below, and the respective reels 2 are horizontally placed on the upper surface 20a of the reel stand 20 by the annular portions 13 of the reel stand springs 1.
The lower flanges 11 are floated above the lower half 15 by being pushed upward against the spring force of 6. Then, the lower end 29a of the vertical cylindrical surface 29 of each rib 26 is opposed to the tapered surface 27 of the upper half portion of each reel base insertion hole 6, and a sufficiently large gap g4 is formed between them. Further, since the protruding length h2 of each rib 26 is smaller than the protruding length h1 of each annular portion 13, each rib 26 does not come into contact with the upper surface 20a of each reel stand 20.

Therefore, according to the present invention, the ribs 26 of each reel 2 do not interfere with the lower half 15 and each reel stand 20 in the above-mentioned use state, so that each reel 2 is placed on the upper surface 20a of each reel stand 20. Can be mounted (placed) horizontally in a stable manner at all times, and at the same time, the reels 20 can be rotationally driven in a stable manner at all times.

The taper surface 30 at the lower end of the rib 26 of each reel 2 is inserted (fitted) from above with each rib 26 being horizontally displaced with respect to each reel base insertion hole 6.
In doing so, there is an action of smoothly guiding each rib 26 into each reel base insertion hole 6 by the guiding action by the taper surface 27 of each reel base insertion hole 6. Also, each rib 26
Also serves as a reinforcing rib for the lower flange 11.

The above is a description of one embodiment of the present invention.
Based on the technical idea of the present invention, the present invention can be applied to various tape cassettes other than those for video tape recorders.

[0025]

According to the present invention, the pair of left and right reels collide with each other at the outermost peripheral portions of the tape wall and the reels in the cassette housing even when vibration or impact is applied to the cassette housing when the tape cassette is not used. Since it does not occur at all, the reel and the tape are not damaged and the winding of the tape is not disturbed at all, and the stability is very high. In addition, when the tape cassette is in use, the pair of left and right reels are horizontally and stably mounted on the pair of left and right reels to be stably rotated, so that the tape is stably run and the recording and reproducing accuracy is high. . Still, it is very simple in structure and manufacturing and low in cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of a tape cassette for a video tape recorder to which the present invention is applied.

FIG. 2 is a partially enlarged view of the tape cassette shown in FIG.

FIG. 3 is a bottom view of a conventional tape cassette.

4 is a cross-sectional view of a main part of the tape cassette shown in FIG.

[Explanation of symbols]

 1 magnetic tape 2 reel 3 cassette housing 6 reel stand insertion hole 11 lower flange 13 annular part 14 upper half 15 lower half 20 reel stand 26 rib 27 taper surface 28 cylindrical surface 29 cylindrical surface 29a cylindrical lower end g3 small gap g4 Big gap

Claims (1)

[Claims] 1. A pair of left and right reels around which a tape is wound are rotatably accommodated in a cassette housing composed of upper and lower halves, and the reels are mounted on a lower surface of lower flanges of the pair of left and right reels. The annular parts are integrally formed and provided, and when the lower flanges of the pair of left and right reels are placed on the lower half, these annular parts are inserted into the pair of left and right reel stand insertion holes provided in the lower half. When the pair of left and right reel stands are inserted into the pair of left and right reel stand insertion holes, the pair of left and right reel stands are placed on the reel stand by these annular portions, and the lower flange is attached. In a tape cassette configured to be floated above the lower half, an annular position regulating rib is integrally formed on the outer circumference of the annular portion on the lower surfaces of the lower flanges of the pair of left and right reels. The ribs have a projecting length smaller than the projecting length of the annular portion downward from the lower surface of the lower flange, and the peripheral surfaces of the pair of left and right reel stand insertion holes are almost the same. The upper half is formed into an annular tapered surface whose diameter gradually increases upward, and the lower half is formed into a vertical cylindrical surface, and the lower flanges of the pair of left and right reels are mounted on the lower half. In the state in which the ribs are placed, by inserting the rib together with the annular portion into the pair of left and right reel base insertion holes, the lower ends of the vertical cylindrical surfaces of the outer periphery of these ribs are located below the reel base insertion hole. Horizontally face each other with a small gap inside the half vertical cylindrical surface,
These ribs are configured to regulate the horizontal position of the reel in the reel base insertion hole, and the pair of left and right reel bases are inserted into the pair of left and right reel base insertion holes to form the pair of left and right reels. When the reel is placed on the reel stand by these annular portions, a large gap is formed between the lower end of the vertical cylindrical surface of the outer periphery of the rib and the tapered surface of the upper half of the reel stand insertion hole. A tape cassette characterized in that it is configured to form a tape.