JPH04228163A - Tape cassette - Google Patents

Abstract

PURPOSE:To regulate the large movement of a reel in a horizontal direction in a state where it is not used by an insertion hole by providing a rib on the reel and specifying the peripheral surface of the insertion hole of a reel base. CONSTITUTION:This cassette is obtained by integrally molding the annular rib 26 for regulating the position on the outer periphery of the annular part 13 of the lower flange 11 of a pair of reels 2. Then, the peripheral surface 6a of the insertion hole 6 of a pair of reel bases is formed so that an almost upper half may be an annular tapered surface 27 that the diameter is enlarged toward an upper part and an almost lower half may be a vertical cylindrical surface 28. Furthermore, by inserting the rib 26 in the insertion hole 6 with the annular part 13, the lower end 29a of the vertical cylindrical surface 29 of the rib 26 is overlapped on the cylindrical surface 28 by height h3, and a gap g3 is formed between the cylindrical surfaces 28 and 29.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a tape cassette that is most suitable for use in, for example, a video tape recorder, and in which a pair of left and right reels wound with tape are housed within the cassette. be.

0002

[Summary of the Invention] The present invention allows a pair of left and right reels wound with tape to be rotatably housed in a cassette housing consisting of an upper and lower half, and a pair of left and right reels that are mounted on the reel stand on the lower surfaces of the lower flanges of the pair of left and right reels. An annular part for mounting is integrally molded, and when the lower flanges of the left and right pair of reels are placed on the lower half, the left and right pair of reels with these annular parts provided on the lower half are separated. Insert it into the table insertion hole,
When the left and right pair of reel stands are inserted into the left and right pair of reel stand insertion holes, the left and right pair of reel stands are placed on the reel stand by these annular parts, and the lower flange is inserted into the lower half. In the tape cassette configured to float upward, a rib dedicated to regulating the position of the reel is integrally molded on the outer periphery of the annular portion on the lower surface of the lower flanges of the pair of left and right reels. When the tape cassette is not in use (the pair of left and right reels are placed on the lower half by the lower flange),
The engagement between 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 inside the cassette housing due to vibrations or shocks. When the cassette is in use (a pair of left and right reels are placed on a pair of left and right reel stands), by preventing the ribs from interfering with the lower half or the reel stand, it is possible to This prevents damage to the reels and tape caused by horizontal movement of the left and right reels inside the cassette housing due to vibrations and shocks. This allows the reel to be rotated in a stable manner.

0003

2. Description of the Related Art A conventional example of a tape cassette for a video tape recorder will be explained with reference to FIGS. 3 and 4.

First, as shown in FIG. 3, a pair of left and right reels 2 on which magnetic tape 1 is wound are rotatably housed in a cassette housing 3. As shown in FIG. The magnetic tape 1 is guided by a pair of left and right tape guides 4 provided inside the cassette housing 3, and is stretched along the inside of a front cover 5 attached to the cassette housing 3 so as to be openable and closable. Further, 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. 4(A), each reel 2
is molded from synthetic resin, and the magnetic tape 1
is wound around the outer periphery, and a cylindrical hub 9 around which the magnetic tape 1 is wound is integrally provided with disc-shaped upper and lower flanges 10 and 11 provided above and below the cylindrical hub 9. There is. In the lower half of the hub 9, there is a reel shaft engagement hole 12.
An annular portion 13 for placement on the reel stand is integrally formed on the lower surface 11a of the lower flange 11 at the outer peripheral position thereof. Further, the cassette housing 3 is constituted by upper and lower halves 14 and 15 molded from synthetic resin, and the reel stand insertion hole 6 and the positioning pin engagement hole 7 are provided in the lower half 15. and upper half 1
A pair of left and right reel pressing spring mechanisms 16 provided directly above each reel 2 at the bottom of the reel 2 press each reel 2 by spring force.
A central pivot 17 provided on the upper surface of the central portion of the hub 9 is elastically pressed downward.

[0006] When the tape cassette is not in use,
As shown in FIG. 4A, the lower flange 11 of each reel 2 is elastically pressed and placed horizontally on the upper surface 15a of the lower half 15 by the spring force of each reel pressing spring mechanism 16. An annular portion 13 is inserted into each reel stand insertion hole 6.

On the other hand, when the tape cassette is used by being attached to a video tape recorder, as shown in FIG. The cassette housing 3 is horizontally positioned by being engaged with the positioning pin 19, and a pair of left and right reel stands 20 are relatively inserted into each reel stand insertion hole 6 from below. Each reel 2 is horizontally aligned on the upper surface 20a of the reel stand 20 by these annular portions 13 and pushed upward against the spring force of each reel pressing spring mechanism 16, so that these lower flanges 11 is floated above the lower half 15. At this time, each reel stand 20
A reel shaft 21 integrally formed in the center of the upper surface 20a is connected to the reel shaft engagement hole 1 of the pair of left and right reels 2.
2 and are engaged with each other, so that each reel stand 20 can rotate each reel 2 via these reel shafts 21.

[0008]

[Problems to be Solved by the Invention] In this conventional example, as shown in FIG. 4(B), the annular portion 1 of the reel 2
3 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 smaller than the outer diameter D2 of the reel stand 20.
A large gap g1 is formed between the outer circumferential surface 13a of the annular portion 13 and the circumferential surface 6a of the reel stand insertion hole 6. Note that this is reel 2
, cassette housing 3, reel stand insertion hole 6, positioning pin engagement hole 7, reel shaft engagement hole 12, annular portion 13, positioning pin 19, reel stand 20, and reel shaft 21 molding, processing, and assembly dimensions. After considering the tolerance, verticality and center runout of the reel stand and reel shaft 21, the reel stand 20 is inserted into the reel stand insertion hole 6 with sufficient margin, and the reel 2
The annular portion 13 is placed stably and horizontally on the upper surface 20a of the reel stand 20 with sufficient margin, and the reel stand 20 is
When the reel 2 is rotated by 0, the reel stand 2
This is to prevent the annular portion 13 of the reel 2 and the reel 2 from interfering with the circumferential surface 6a of the reel base insertion hole 6.

On the other hand, in order to make tape cassettes smaller and lighter, the actual situation is that the outer diameter of the cassette housing 3 and the distance between the left and right reels 2 have to be made as small as possible. As shown in (B), the outermost periphery of the reel 2 (refers to the outer periphery 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 periphery of the winding diameter.) 23 and the wall surface inside the cassette housing 3 (an arc-shaped wall integrally formed on 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 periphery of the upper and lower flanges 10 and 11) ) 24 and between the pair of left and right reels 2, the reality is that only a very small gap g2 can be formed compared to the large gap g1.

As a result of the above, in this conventional example, (A
), when vibration or impact is applied to the cassette housing 3 in the horizontal direction (in the direction of the arrow a) when the cassette housing 3 is not in use, the large gap g1 within the cassette housing 3 as shown by the arrow a
The reels 2 attempting to move freely in the direction collide with each other and the wall surface 24 inside the cassette housing 3 at the outermost circumferential portion 23 thereof. If the collision part of the reel 2 is the outermost peripheral part 23 of the reel 2 in this way, the reel 2 and the magnetic tape 1 are likely to be significantly damaged, and the magnetic tape 1 is likely to be wound irregularly. That is, since the upper and lower flanges 10 and 11 of the reel 2 are comparatively thin disks molded from synthetic resin and have low rigidity, when an impact is applied to the outermost periphery 23 of these upper and lower flanges 10 and 11, , these upper and lower flanges 10 and 11 are likely to be bent or cracked.

Furthermore, when the upper and lower flanges 10 and 11 are bent, the magnetic tape 1 wound between them is pressed from above and below, causing damage to the upper and lower edges of the magnetic tape 1 or causing irregular winding. In particular, when the winding diameter of the magnetic tape 1 wound on one reel 2 reaches its maximum, the upper or lower flange 10 of the other reel 2 is attached to the outermost circumference 23 of the winding diameter.
, 11 may collide, and in this case, the magnetic tape 1 is likely to be significantly damaged and winding irregularities are likely to occur.

[0012] In the present invention, when the tape cassette is not in use, the pair of left and right reels inside the cassette housing move largely in the horizontal direction due to vibrations and impacts, and these reels touch the wall surface inside the cassette housing at their outermost peripheries. It is possible to prevent collisions between reels or reels. Moreover, when the tape cassette is in use, it has a very simple structure that allows the pair of left and right reels to be mounted on the pair of left and right reel stands, and the rotation of each reel by each reel stand to be performed stably at all times. This is what we are trying to achieve.

[0013]

[Means for Solving the Problems] The present invention provides the tape cassette described above, in which an annular position regulating rib is integrally provided on the outer periphery of the annular portion on the lower surface of the lower flanges of the pair of left and right reels. The protruding length of the rib is smaller than the protruding length of the annular portion downward from the lower surface of the lower flange. 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 placed on the lower half. By inserting the rib together with the annular portion into the pair of left and right reel stand insertion holes, the lower ends of the vertical cylindrical surfaces of the outer periphery of these ribs are placed almost below the reel stand insertion hole. Horizontally facing each other with a small gap inside half of the vertical cylindrical surface,
These ribs are configured to regulate the horizontal position of the reel within the reel base insertion holes, and the pair of left and right reel bases are inserted into the pair of left and right reel base insertion holes, and the pair of left and right reel bases are inserted into the pair of left and right reel base insertion holes. When the reel is placed on the reel stand by these annular parts, there is a large gap between the lower end of the vertical cylindrical surface on the outer periphery of the rib and the tapered surface of the approximately upper half of the reel stand insertion hole. It is configured so that it forms.

[0014]

[Operation] In the present invention, when the tape cassette is not in use,
Due to the engagement between the ribs of the pair of left and right reels and the pair of left and right reel base insertion holes, large movement of the pair of left and right reels in the cassette housing in the horizontal direction is restricted within the pair of left and right reel base insertion holes. Therefore, these reels are prevented from colliding with each other on the wall inside the cassette housing or with each other at their outermost peripheries.

Moreover, when the tape cassette is in use, the ribs of the left and right reels do not interfere with the lower half or the left and right reel stands, so the left and right reels are always placed horizontally on the left and right reel stands. In addition to being able to be mounted (mounted) with good stability, each reel can always be rotated and driven stably by each reel stand. In addition, the ribs can be molded onto the lower flange very easily using synthetic resin, and the tapered surfaces of the pair of left and right reel stand insertion holes in the lower half can also be molded extremely easily using synthetic resin. The structure and manufacturing are very simple.

[0016]

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. 1 and 2. Note that the same reference numerals are given to the same structural parts as those of the conventional example explained with reference to FIGS. 3 and 4, and the explanation thereof is omitted.

The present invention provides an annular portion 1 for mounting on a reel stand on the lower surface 11a of the lower flange 11 of the pair of left and right reels 2.
A position regulating rib 26 having an annular shape is integrally molded on the outer periphery of 3. As shown in FIG. 2A, the annular portion 13 extends downward from the lower surface 11a of the lower flange 1.
The protrusion length h2 of the rib 26 is configured to be smaller than the protrusion length h1 of the rib 26.

Further, in the present invention, the peripheral surfaces 6a of the pair of left and right reel stand insertion holes 6 are formed into an annular tapered surface 27 whose diameter gradually increases upward in approximately the upper half, and One half is formed into a vertical cylindrical surface 28. Furthermore, rib 26
The outer periphery is also formed as a vertical cylindrical surface 29, but an annular tapered surface 30 whose diameter gradually decreases downward is formed at the lower end as necessary.

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 reduced as in the conventional example. As a result, the lower flange 11 of each reel 2 is connected to the lower half 1.
5 is elastically pressed and placed horizontally on the upper surface 15a of the reel table 5. At this time, each rib 26 is inserted into each reel stand insertion hole 6 together with each annular portion 13. The lower end 29a of the vertical cylindrical surface 29 on the outer periphery of the rib 26 is connected to each reel stand insertion hole 6.
It overlaps the vertical cylindrical surface 28 in the lower half of the reel by a height h3, and a small gap g3 is formed between these two cylindrical surfaces 29 and 28, and this gap g3 is the top of the reel 2 mentioned above. The gap is sufficiently smaller than the gap g2 between the outer peripheral portion 23 and the wall surface 24 inside the cassette housing 3 and between the pair of left and right reels 2.

Therefore, according to the present invention, each reel 2 in the cassette housing 3 is damaged by vibration or impact in the above-mentioned non-use state, as shown by the dashed line in FIGS. 1A and 2A. is moved in the horizontal direction (direction of arrow a), the gap g2
When the reel 2 moves by the smaller gap g3, the cylindrical surface 29 of each rib 26 immediately collides with the cylindrical surface 28 of each reel stand insertion hole 6, and further movement of the reel 2 is restricted. Therefore, the reels 2 are prevented from colliding with each other on the wall surface 24 inside the cassette housing 3 or with each other at the outermost peripheral portions 23 of the reels 2.

Furthermore, according to the present invention, when the tape cassette is in use, as shown in FIGS. The reel stands 20 are inserted relatively from below, and each reel 2 is placed horizontally on the upper surface 20a of the reel stand 20 by these annular parts 13, and each reel pressing spring mechanism 16
These lower flanges 11 are floated above the lower half 15 by being pushed upward against the spring force. Then, the lower end 29a of the vertical cylindrical surface 29 of each rib 26 is opposed to the tapered surface 27 of substantially the upper half of each reel stand insertion hole 6, and a sufficiently large gap g4 is formed between them. Further, the protrusion length h2 of each rib 26 is
Since it is configured to be smaller than the protrusion length h1 of No. 3,
Each rib 26 does not come into contact with the upper surface 20a of each reel stand 20.

Therefore, according to the present invention, in the above-mentioned state of use, the ribs 26 of each reel 2 are connected to the lower half 15 and each reel stand 2.
0, so each reel 2 can be mounted horizontally and stably on the top surface 20a of each reel stand 20 (
In addition, each reel 2 can be rotated by each reel stand 20 in a stable manner at all times.

Note that the tapered surface 30 at the lower end of the rib 26 of each reel 2 is inserted (fitted) from above with each rib 26 horizontally misaligned with respect to each reel base insertion hole 6.
At this time, each rib 26 is smoothly guided into each reel base insertion hole 6 by the guiding action of the tapered surface 27 of each reel base insertion hole 6. Also each rib 26
also serves as reinforcing ribs for the lower flange 11.

Although one embodiment of the present invention has been described above,
Based on the technical idea of the present invention, the present invention is applicable to various tape cassettes other than those for video tape recorders.

[0025]

[Effects of the Invention] The present invention prevents the pair of left and right reels from colliding with each other and against the wall inside the cassette casing at their outermost peripheries even if vibration or impact is applied to the inside of the cassette cassette when the tape cassette is not in use. Since there is nothing to do, there is no chance of the reel or tape being damaged or the tape winding irregularly, resulting in extremely high stability. Moreover, when the tape cassette is in use, the pair of left and right reels are stably mounted horizontally on the pair of left and right reel stands and are driven to rotate stably, so the tape runs stably and recording and playback are highly accurate. . However, the structure and manufacture are very simple and the cost is low.

[Brief explanation of the drawing]

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. 1;

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

FIG. 4 is a sectional view of a main part of the tape cassette shown in FIG. 3;

[Explanation of symbols]

1 Magnetic tape 2 Reel 3 Cassette case 6 Reel stand insertion hole 11 Lower flange 13 Annular part 14 Upper half 15 Lower half 20 Reel stand 26 Ribs 27 Tapered surface 28 Cylindrical surface 29 Cylindrical surface 29a Lower end of cylindrical surface g3 Small gap g4 Large gap

Claims (1)

[Claims] Claim 1: A pair of left and right reels wound with tape is rotatably stored in a cassette housing consisting of an upper and lower half, and a reel for placing on a reel stand is provided on the lower surface of the lower flange of the pair of left and right reels. The annular portions are integrally molded and provided, and when the lower flanges of the pair of left and right reels are placed on the lower half, these annular portions are inserted into the pair of left and right reel stand insertion holes provided on the lower half. When the left and right pair of reel stands are inserted into the left and right pair of reel stand insertion holes, the left and right pair of reel stands are placed on the reel stand by these annular portions, and the lower flange is inserted. In the tape cassette configured to float above the lower half, an annular position regulating rib is integrally formed on the outer periphery of the annular portion on the lower surface of the lower flanges of the pair of left and right reels. The protruding length of the rib is smaller than the protruding length of the annular portion downward from the lower surface of the lower flange, and the circumferential surface of the pair of left and right reel stand insertion holes is approximately the upper half. is formed into an annular tapered surface whose diameter gradually increases upward, and substantially the lower half is formed into a vertical cylindrical surface, and the lower flanges of the pair of left and right reels are placed on the lower half. In this state, 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 aligned with the lower half of the reel base insertion hole. These ribs are arranged horizontally opposite to each other with a small gap inside the vertical cylindrical surface, and these ribs regulate the horizontal position of the reel within the reel base insertion hole. When the pair of left and right reel stands are inserted into the holes and the pair of left and right reels are placed on the reel stand by these annular parts, the lower end of the vertical cylindrical surface of the outer periphery of the rib and the reel A tape cassette characterized in that a large gap is formed between the base insertion hole and the tapered surface in the upper half thereof.