JP2001035122A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent insertion of a magnetic tape between upper and lower halves in assembling work of a tape cassette. SOLUTION: A tape guiding part 21 is protrusively formed on the inner peripheral surface side of a screw stopping boss 16 of the lower half 3 in which reel hubs 4, 5 wound with a magnetic tape T are incorporated, and a tape path (p) of the magnetic tape T is formed leaving a prescribed interval from the inside surface of an inner wall part 15 between a guide 7 of the front surface side of the lower half 3 and the tape guiding part 21. By virtue of the tape path (p), the magnetic tape T is held apart from the inner wall part 15 and the insertion of the magnetic tape T between confronted surfaces of the upper and lower halves 2, 3 in the combining body of the upper half with the lower half 3 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette and, more particularly, to a tape cassette which prevents a magnetic tape from being pinched when the upper and lower halves are joined together.

[0002]

2. Description of the Related Art FIG. 5 and FIG.
The video tape cassette shown in FIG. 1 accommodates a pair of reel hubs 4 and 5 around which a magnetic tape T is wound between upper and lower halves 2 and 3 forming a cassette body 1.
The reel drive shaft on the recording / reproducing apparatus side is inserted and engaged with the drive shaft engaging portions 4a, 5a at the center of the lower half 3 through the reel drive shaft insertion holes 3a, 3b formed in the lower half 3. Guides 7, 7 are formed at both sides of the front mouth portion 6 of the cassette body 1 at the front of the opening, and are pulled out from both reel hubs 4, 5 on both sides of the front portion of the lower half 3 toward the front side of the mouth portion 6. A lid 8 is formed on the front side of the cassette body 1 to open and close the mouse section 6 from the front openings of the upper and lower halves 2 and 3. A flap 9 for protecting the inner side of the magnetic tape T in the mouth portion 6 is attached to the inside of the lid 8.

[0003] The tape cassette thus constructed is
The upper and lower halves 2 and 3 forming the cassette body 1 have flat walls in which peripheral walls 11 and 12 from the rear surface to both side surfaces and partition walls 13 and 14 on the front side, that is, the inner surface side of the mouse part 6 are formed at substantially the same height. Inner wall portions 15, 15 which are box-shaped and which are located at both ends of the partition wall portion 14 of the lower half 3 at predetermined intervals from the front end portions of both side surfaces of the peripheral wall portion 12 and serve as side surfaces of the mouse portion 6.
Are formed at the same height as the height of the peripheral wall portions 11 and 12 of the upper and lower halves 2 and 3, and the guides 7, 7 having a semicircular cross section are formed on the inner surfaces of the front ends of the inner wall portions 15, 15. Thus, the above-described tape path portion P is formed.

In the lower half 3, screw bosses 16, 16 are formed between both ends of the partition 14 and the inner ends of the inner walls 15, 15 at the same height as the partition 14. Screw bosses 17 are also provided on both sides of the rear part.
Is formed at the same height as the height.

The magnetic tape T is wound around the lower half 3 formed as described above, and the reel hubs 4, 5 are housed together with necessary members such as a reel lock member and an erroneous erasure prevention member. Pull out from the peripheral wall 12
From the space between the front end portions of both side surfaces and the inner wall portions 15 and 15 to the tape path portion P extending to the mouse portion 6. The upper half 2 is overlaid on the lower half 3 with a reel holding spring member 18 and the like in a state where the lid 8 to which the flap 9 is attached is engaged and held via a closing-direction urging spring member 19. Peripheral wall portions 11 and 12 and partition wall portions 13 and 14
And the screw boss 1 on the lower half 3 side
6, 16 and 17, 17 are screwed together with screwing projections on the upper half 2 side and screwed from the lower half 3 side with screws 20, 20 to form the cassette body 1.

[0006]

The shape of the tape path portion P of the cassette body 1 of the tape cassette constructed as described above is shown by enlarging the tape path portion P on the winding side of the lower half 3 in FIG. When the magnetic tape T is passed through the tape path portion P on the lower half 3 side, the magnetic tape T is continuously connected to the inner wall surface between the reel hub 5 and the guide 7, that is, the partition wall portion 14. Screw boss 1
6 from the peripheral surface of the inner wall portion 15 to the inner surface of the inner wall portion 15, and the screwing boss 16 and the inner wall portion 15 in the vicinity thereof become the butted portion 15a with the partition portion 13 on the upper half 2 side. T is almost half of the width direction, that is, the lower half of the width direction contacts.

For this reason, the lower half 3 in which the magnetic tape T wound around the reel hubs 4 and 5 is assembled together with other members.
When the upper half 2 is assembled and assembled, the lower half in which the upper half side in the width direction of the magnetic tape T is the butted portion 15a with the partition 13 side of the upper half 2 due to the looseness of the magnetic tape T or the like. The screw boss 16 on the third side and the inner wall portion 15 in the vicinity thereof may be inclined toward the end face side.
When the upper half 2 is combined with the lower half 3, as shown in FIG.
There is a risk of pinching at 5a. In such a case, if the tape cassette is used as it is, the magnetic tape T does not run, and if the tape is forced to run, the magnetic tape T is cut and the tape cassette becomes unusable.
There is a possibility that problems such as disturbing the recording / reproducing apparatus side may occur.

In order to prevent the magnetic tape T from being pinched when the upper and lower halves 2 and 3 are combined in assembling such a tape cassette, the reel hubs 4 and 5 around which the magnetic tape T is wound around the lower half 3 are assembled. Since the position is regulated in the rotation direction when the tape cassette is inserted and the positioning is adjusted when the upper and lower halves 2 and 3 are combined, the configuration of the tape cassette assembling apparatus is complicated, and the operation is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tape cassette which can reduce the possibility of pinching a magnetic tape when the upper and lower halves are assembled.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a tape cassette comprising upper and lower halves united and containing a magnetic tape wound around a pair of reel hubs. The tape guide portion for forming a tape path of the magnetic tape is provided on a tape path portion side of one half on which the reel hub is incorporated, being separated from an inner wall surface.

In the above construction, the tape guide portion may be formed on a line connecting a tangent line of the reel hub to a tape path portion of the other half into which the reel hub is incorporated and a tangent line of a tape guide of a device on which the tape cassette is loaded. It is formed so as to be located inside.

Further, in the above configuration, the tape guide portion is formed as a projection on the inner peripheral surface side of the screw boss on the side of the tape path of the other half into which the reel hub is incorporated.

Further, in the above configuration, the tape guide portion is formed in one half into which the reel hub is incorporated, protruding as a pin-shaped protrusion located near the inner wall surface side on the tape path portion side.

As described above, in the tape cassette according to the present invention, the tape guide portion for forming the tape path is formed on the side of the tape path of the other half in which the reel hub around which the magnetic tape is wound is incorporated, so as to be separated from the inner wall surface. Accordingly, the magnetic tape is separated from the inner wall surface at a required interval, and the insertion of the other half into the one half prevents the magnetic tape from being pinched between the two halves.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
4 to FIG. 4, the present invention can be applied to the same tape cassette as the conventional tape cassette shown in FIGS. 5 and 6 described above. The same reference numerals are given to the constituent parts, and only the main parts are illustrated and described.

FIG. 1 shows a tape cassette according to this embodiment.
As shown in FIG. 1, a tape guide portion 21 is formed in a tape path portion P of the lower half 3 in which the reel hubs 4 and 5 around which the magnetic tape T of the cassette body 1 is wound are incorporated. That is,
In this embodiment, as shown in FIG. 3, the tape guide portions 21 are tape pass portions P on both front sides of the lower half 3.
It is formed on the inner peripheral surface of the screwing boss 16 between the partition wall portion 14 and the inner wall portion 15 which is the inner wall surface on the side, as a projection having a circular cross section.

Since the protrusion as the tape guide 21 is formed on the screw boss 16 on the tape path P side of the lower half 3 in this manner, the magnetic tape T led out from the reel hubs 4 and 5 can be used as the tape guide. 21 and the guide 7 formed on the inner surface side of the front end portion of the inner wall portion 15 so as to extend from the peripheral surface of the screw boss 16 to the inner wall portion 1.
5, a tape path p is formed which is separated from the sliding contact surface toward the inner surface side.

In this manner, the tape path p of the tape path portion P in the lower half 3 is formed at a required distance g from the sliding contact surface on the inner wall portion 15 side.
Even if the magnetic tape T incorporated in the lower half 3 is loosened, the upper half side in the width direction of the magnetic tape T covers the butted portion surface 15a of the upper half 2 with the partition 13 as shown in FIG. As a result, even when the upper half 2 is combined with the lower half 3 in which the magnetic tape T is incorporated, the upper and lower halves 2 and 3 are combined without a risk of sandwiching the magnetic tape T at the mating surfaces of the lower half 3. it can.

The tape guide portion 21 formed on the tape path portion P of the lower half 3 is not formed on the peripheral surface of the screw boss 16, but is formed separately from the screw boss 16 as shown in FIG. It can be formed as a protrusion. In this case, the protrusion as the tape guide portion 21 is formed in the tape path portion P inside a line connecting the tangent line of the reel hub 5 and the tangent line of the tape guide of the recording / reproducing apparatus into which the tape cassette is loaded. I do.

Thus, even when the reel hub 5 is rotated in the counterclockwise direction, the magnetic tape T is held at a required interval g with respect to the inner wall surface side, and the lower half 3 and the upper half 2 are combined and united. This prevents pinching during the operation.

The tape cassette of the present embodiment having the above-described configuration is configured such that the magnetic tape T wound around the reel hubs 4 and 5 and incorporated into the lower half 3 when the upper and lower halves 2 and 3 are combined and assembled. Are held apart from the inner surface of the inner wall portion 15 where the end surface becomes the abutting portion surface 15a with a required gap g. Therefore, even when the magnetic tape T is under tension or is loosened, the possibility that the magnetic tape T is pinched between the upper and lower halves 2 and 3 is eliminated. Not only expands the degree of freedom, but also
The positioning adjustment at the time of combining and combining is also facilitated, and the productivity can be improved.

A magnetic tape T is provided between the upper and lower halves 2 and 3.
Is almost completely prevented, so that the reliability of the tape cassette can be further improved.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, but can be variously modified without departing from the gist of the present invention.

For example, the protrusion formed on the peripheral surface of the screw boss 16 as the tape guide 21 is
It may be formed at a low height without being limited to a height substantially equal to the above, or it may be formed in a protruding piece shape.

Further, the present invention is not limited to a video tape cassette, but may be a digital audio tape cassette (D
AT cassette) and various tape cassettes such as a small tape cassette.

[0026]

As described above, according to the present invention, a tape guide for forming a magnetic tape tape path apart from the inner wall surface on the tape path side of one of the upper and lower halves on which the reel hub is incorporated. By forming the portion, the magnetic tape wound on the reel hub is held in a state of being separated from the inner wall surface, preventing the tape from being pinched when the upper and lower halves are combined, and the mounting position in the rotation direction of the reel hub is free. Not only is the degree of expansion widened, but also the positioning adjustment at the time of combining the upper and lower halves becomes easy, and productivity can be improved.

Further, since the tape is completely prevented from being caught between the upper and lower halves, it is possible to almost omit the tape running inspection after the production of the tape cassette.
The cost of a highly reliable tape cassette can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a lower half side of an example of a tape cassette according to the present invention.

FIG. 2 is a plan view of a main part of a lower half side of a tape cassette according to another example of the present invention.

FIG. 3 is an enlarged view of a portion A in FIG.

FIG. 4 is an enlarged sectional view of a main part of an example tape cassette according to the present invention.

FIG. 5 is an exploded perspective view of a conventional video tape cassette.

FIG. 6 is an inner plan view of a part of the lower half side of the video tape cassette shown in FIG. 5;

7 is an enlarged plan view of a part of a lower half of the video tape cassette shown in FIG. 6;

8 is an enlarged sectional view of a part of the video tape cassette shown in FIG. 5, showing a state where a magnetic tape is sandwiched.

[Explanation of symbols]

1 ‥‥ cassette body, 2 ‥‥ upper half, 3 ‥‥ lower half, 4, 5 ‥‥ reel hub, 6 ‥‥ mouth, 7, 7 ‥
{Guide, 14} Partition wall, 15} Inner wall, 15a
{But face, 16} Screw boss, 21} Tape guide, P {Tape path, p} Tape path, T}
‥Magnetic tape

Claims (4)

[Claims] 1. A tape cassette in which upper and lower halves are united and a magnetic tape wound around a pair of reel hubs is stored, wherein a tape path of one half of the upper and lower halves on which the reel hub is incorporated is provided. A tape cassette, further comprising a tape guide section formed on a side of the section and separated from an inner wall surface to form a tape path of the magnetic tape. 2. The tape cassette according to claim 1, wherein the tape guide section has a tangent line between a tangent line of the reel hub and a tangent line of a tape guide of an apparatus into which the tape cassette is loaded. A tape cassette formed at a position inside a line connecting the tape cassette and the tape cassette. 3. The tape cassette according to claim 1, wherein the tape guide portion is formed in a projecting shape on an inner peripheral surface side of a screw boss on a tape path portion side of the one half. Tape cassette. 4. The tape cassette according to claim 1, wherein the tape guide portion is formed in the one half so as to protrude as a pin-shaped protrusion located near the inner wall surface side of the tape path portion side. A tape cassette characterized by the above-mentioned.