JPH0935451A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a traveling magnetic tape from slacking by making an insertion groove between the wall constituting a loading space and a supporting member, as an anti-slacking mechanism for tape, and providing an anti-slacking member and an anti-slacking rib in the insertion groove. SOLUTION: The body of tape cassette 1 comprises an upper half and a lower half 7. An anti-slacking mechanism 40 for tape comprises a pair of guide rollers 25 for feeding a magnetic tape 3 from a reel into a loading space and winding the magnetic tape around another reel, and a supporting member 46 disposed closely to the wall 8 constituting the loading space. An insertion groove 50 is made between the wall 8 constituting the loading space and the supporting member 46. An anti-slacking rib 55 provided in the insertion groove 50 along with an anti-slacking member 41 constructed arcuately. The anti-slacking member 41 fitted to a fitting part 51 has linear forward end part 43 which urges a tape 3 passing through the guide roller 25 and the supporting member 46 to prevent the traveling tape from slacking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores a pair of tape reels around which a magnetic tape used in a video tape recorder is wound in a cassette body so as to be rotatable.
The present invention relates to a tape cassette in which a lid that protects a magnetic tape is rotatably attached to a front surface portion, and more specifically, to a tape cassette that prevents the magnetic tape from loosening during traveling.

[0002]

2. Description of the Related Art Generally, a tape cassette is constructed by rotatably accommodating a pair of tape reels around which a magnetic tape is wound, inside a cassette body composed of an upper half and a lower half. For example, in a data recording tape cassette or a tape cassette for a video tape recorder, when loaded in a recording and / or reproducing device, a magnetic tape is recorded and / or recorded by a tape loading means on the recording and / or reproducing device side. Alternatively, tape loading that is pulled out to the reproducing unit is performed.

In these tape cassettes, a loading space for allowing the tape loading means to enter is formed on the front surface of the cassette body, and a pair of tapes are located on one half side on both sides of this loading space. A guide is provided. The magnetic tape fed from the tape supply reel is extended along the loading space of the cassette body by being hooked on these tape guides.

For example, in a tape cassette 100 for a video tape recorder, as shown in FIGS. 8 and 9, an upper half (not shown) and a lower half 106 (not shown) formed in a horizontally long and substantially rectangular shallow shape are mutually connected by a plurality of screws. The cassette body 105 is configured by being joined and fixed. And
Inside the cassette body 105, left and right tape reel storage walls (not shown) on the upper half side and left and right tape reel storage walls 111 (111A, 111B) on the lower half 106 side are butted against each other to form an arc tape reel. Storage 1
10 (110A, 110B) are formed on the left and right.
On the lower half 106 side, a pair of left and right guide rollers 134 for sending the magnetic tape 108 to the loading space 120 and the magnetic tape 108 for the loading space 1 are provided.
A pair of left and right tape guides 125 (12
5A, 125B) and the supporting member 132 are provided near the left and right sides of the loading space 120. Further, around the lower half 106, a rising peripheral wall for abutting against the upper half and a loading space portion constituting wall 109 constituting the loading space portion 120 are erected.

On the front side of the tape cassette 100, the magnetic tape 1 extending into the loading space 120 is provided.
A lid (not shown) is provided to protect 08. The lid is rotatably mounted by being supported by a support shaft hole (not shown) provided on the side surface of the cassette body 105. The lid is positioned so as to close the loading space 120 when the tape cassette 100 is not used.

The tape reel 115 is a magnetic tape 108.
And a tape take-up reel 115A for winding the magnetic tape 108 extending in the loading space 120, which are rotatably housed in the tape reel housing 110, respectively.
As described above, the tape reel 115 accommodated in the tape reel accommodating portion 110 is formed of a synthetic resin material having excellent wear resistance. The tape reel 115 includes a cylindrical reel hub, a lower flange portion integrally formed with the lower end of the reel hub, and an upper flange portion combined with the upper end of the reel hub.

The guide roller 134A provided on the lower half 106 is a guide pin 1 provided upright on the lower half 106.
It is rotatably fitted in 35. As a result, the guide roller 134A guides the magnetic tape 109 fed from the tape reel 115 and traveling to the loading space 120.

The magnetic tape 108 wound around the tape supply reel 115B includes a support member 132B and a guide roller 1.
It is guided by a guide roller 134B from between 34B and 34B, is hung on one of the tape guides 125B, and extends above the loading space 120. Further, the magnetic tape 108 is wound around the other tape guide 125A and wound around the tape take-up reel 115A from between the support member 132A and the guide roller 134A via the guide roller 134A.

In the tape cassette 100, the lower half 106 has a loading space 1 as shown in FIG.
Tape loosening prevention mechanisms 130 are provided near the left and right ends of the tape 20. The tape slack prevention mechanism 130 feeds the magnetic tape 108 from the tape supply reel 115B to the loading space 120, and the loading space 120
From the tape take-up reel 115A, a pair of guide rollers 134, a support member 132 provided near both ends of the loading space 120 near the loading space forming wall 109, and the guide roller 134 and the support member described above. A slack prevention member 141 (14) for urging the magnetic tape 108 running between
1A, 141B) and the insertion groove 139 (139) provided between the supporting member 132 and the loading space forming wall 109 of the lower half 106 into which the loosening prevention member 141 is inserted.
A, 139B).

The slack prevention member 141 has a generally rectangular shape as a whole and is made of a material having elasticity, such as a polyester film. Further, an ultra-high polymer PE sheet is used for the tip portion 142 of the slack prevention member 141.
The slack prevention member 141 is inserted into the insertion groove 139 along the support member 132 in an arc shape, and the insertion groove 139 is inserted.
The front end portion 142 exposed from above urges the magnetic tape 108 passing between the guide roller 134 and the support member 132 toward the guide roller 134. Loosening prevention member 141
The ultra-high molecular weight PE sheet used for the front end portion 142 of the magnetic tape 108 prevents the magnetic tape 108 from sticking to the surface of the slack prevention member 141, and stabilizes the running of the magnetic tape 108. In addition, the slack prevention member 141 is used for the magnetic tape 10.
8 is biased outward, the magnetic tape 108
It prevents slack during driving.

The tape cassette 1 configured as described above
When 00 is loaded in the recording and / or reproducing apparatus, the lid driving means on the recording and / or reproducing apparatus side rotates the lid to open the front surface of the cassette body 105. Then, in the tape cassette 100, the tape loading means on the recording and / or reproducing apparatus side enters into the loading space 120 of the cassette body 105, and the magnetic tape 108 is pulled out from the cassette body 105 and on the recording and / or reproducing apparatus side. The recording and / or reproducing unit is loaded.

[0012]

By the way, the tape cassette 100 having the above-described structure is shown in FIG.
8, the length dimension of the cassette body 105 in the longitudinal direction, that is, the X direction shown in FIG. 8, and the short piece direction, that is, the Y direction shown in FIG. 8, and the length dimension D between the support members 132 are determined. To be Therefore, in the tape slack preventing mechanism 130 of the tape cassette 100, the lengths of the A dimension and the B dimension of the loading space forming wall 109 shown in FIG. 9 are different. However, in the tape cassette 100, the tape slack prevention mechanism 130 has the tape supply reel 11
It is configured similarly to the 5B side and the tape take-up reel 115A side.

In particular, in the tape slack preventing mechanism 130 on the side of the tape take-up reel 115A, normally, FIG.
As shown in FIG. 11, the slack prevention member 141A has a corner portion 140A formed by the loading space portion constituting wall 109 and a rising wall 137A at the end portion 14 of the slack prevention member 141A.
3 are in contact. In such a case, the loosening prevention member 1
41A, as shown in FIG.
It is positioned so as to be parallel to the guide roller 134A installed upright. Then, when the slack prevention member 141A is disposed at the position shown in FIG. 10B, the entire surface of the tip end portion 142 of the slack prevention member 141A contacts the magnetic tape 108, and the magnetic tape 108. Is urged toward the guide roller 134A side. Therefore, the slack prevention member 1
41A prevents the magnetic tape 108 from loosening and enables the magnetic tape 108 to run stably.

However, as shown in FIG. 11A, the end portion 143 of the slack preventing member 141A may be removed when the tape cassette 100 is impacted by being dropped or due to vibration while the magnetic tape 108 is running. There is a case where it shifts from the corner portion 140 toward the loading space portion constituting wall 109 side. In such a case, the slack prevention member 141A is
As shown in (B), it tilts downward and is no longer parallel to the guide roller 134 provided upright on the lower half 106. When the slack prevention member 141A is disposed at the position shown in FIG. 11B, the corner of the slack prevention member 141A on the tip end 142 side contacts the magnetic tape 108, and the tip end 142 is formed. The front surface of the side does not contact the magnetic tape 108. Therefore, the slack prevention member 141 cannot prevent the slack of the magnetic tape 108 and stabilize the running of the magnetic tape 108, and the corners of the slack prevention member 141 damage the magnetic tape 108. The recording state of the magnetic tape 108 will be deteriorated.

Therefore, the present invention provides a tape cassette slack prevention mechanism conforming to the standard, thereby preventing the slack of the magnetic tape during running, and providing the tape cassette for running the magnetic tape in a stable state. It was proposed for the purpose of doing.

[0016]

A tape cassette according to the present invention which achieves this object comprises a cassette body formed by combining upper and lower halves, and a cassette body formed by combining the upper and lower halves. A tape slack preventing mechanism is provided for preventing slack of the magnetic tape fed from the rotatably accommodated tape reel. This tape slack prevention mechanism comprises a pair of guide rollers for feeding the magnetic tape from the tape supply reel to the loading space and winding the magnetic tape from the loading space to the tape take-up reel. A support member provided near the wall, a slack prevention member for urging the magnetic tape running between the guide roller and the support member toward the guide roller, and a support member provided between the loading space housing wall and the support member. And an insertion groove in which the slack prevention member is incorporated in an arc shape. The insertion groove is characterized in that a slack preventing rib for restricting the slack preventing member so as to abut against the innermost end is provided.

That is, in the tape cassette according to the present invention, the slack preventing member is steadily fixed to the insertion groove, and the running magnetic tape is biased toward the guide roller. Therefore, the tape cassette runs in a stable state without slackening the magnetic tape.

[0018]

DETAILED DESCRIPTION OF THE INVENTION A tape cassette 1 according to a first embodiment of the present invention will be described below with reference to the drawings.

The tape cassette 1 shown in FIG. 1 is used for a video tape recorder, and its basic structure is almost the same as that of the conventional tape cassette 1. The tape cassette 1 includes a pair of tape reels 15 (15A, 15B) rotatably housed inside a cassette body 5 formed by combining an upper half 6 and a lower half 7, and a front portion of the cassette body 5 is closed. , A lid structure 20 that is rotatably attached.

The upper half 6 and the lower half 7 constituting the cassette body 5 are formed of a synthetic resin material in the shape of a substantially oblong rectangular plate, and are abutted and fixed to each other to form the cassette body 5. To do.

The upper half 6 is provided with a window 9 so that the amount of the magnetic tape 3 wound around the tape reel 15 can be seen. Further, a tape reel pressing member 19 is incorporated in the upper half 6 inside the window 9. The tape reel pressing member 19 presses the tape reel 15 toward the lower half 7 side to prevent vertical movement.

The lower half 7 has a tape reel storage wall 10 (1) which is butted against an arc-shaped tape reel storage wall (not shown) integrally formed on the inner surfaces facing each other on the upper half 6 side.
0A, 10B) to form a tape reel storage portion 11 (11A, 11B). Further, each of the tape reel housing portions 11 is provided with a reel drive shaft hole 12 (12A, 12B). Further, although not shown, the lower half 7 has a plurality of identification holes for identifying the specifications of the tape cassette 1, such as the type and thickness of the magnetic tape 3, along the rear edge of the bottom portion, and the tape cassette 1. There is provided a positioning hole into which the positioning means fits when the recording medium is loaded in the recording and / or reproducing apparatus.

Further, around the upper half 6 and the lower half 7, there are provided rising peripheral walls which are butted against each other, and a loading space portion constituting wall 8 which constitutes a loading space portion 35.

Although not described in detail, the upper half 6 and the lower half 7 configured as described above are integrally formed with a plurality of shaft holes and bosses facing each other on the inner surface. The upper half 6 and the lower half 7 are assembled together by abutting the shaft hole and the boss against each other and screwing in a set screw to form the cassette body 5.
A tape reel 15 is rotatably housed inside the cassette body 5, and a loading space 35 is formed by a loading space forming wall 8 provided in front of the lower half and the upper half.

Further, in the cassette body 5, the lower half 7
On the side, a pair of left and right guide rollers 25 (25A, 25B) for sending the magnetic tape 3 to the loading space 35.
A pair of left and right tape guides 30 (30A, 30B) for extending the magnetic tape 3 into the loading space 35 are provided near the left and right sides of the loading space 35.

The guide roller 25 provided on the lower half 7 side is a guide pin 26 (26) provided upright on the lower half 7.
A, 26B) is rotatably fitted. This allows
The guide roller 25 allows the magnetic tape 3 to run smoothly.

A pair of left and right tape guides 30 are provided upright near the left and right ends of the loading space 35. The magnetic tape 3 is hung on the tape guide 30 so as to extend into the loading space 35.

The lid structure 20 is rotatably attached to a support shaft hole (not shown) provided on the side surface of the cassette body 5. The lid structure 20 has a main surface portion 21 having a length dimension sufficient to cover at least the loading space portion 35, and mounting pieces 22 (22A, 22B) for supporting the main surface portion 21 in a spindle hole of the cassette body 5.
It is composed of

This lid structure 20 is a tape cassette 1
When not in use, the loading space 35 is closed, and the magnetic tape 3 extending above the loading space 35 is protected from contact with a finger of a person or the like, and is prevented from being damaged or damaged.

The tape reel 15 is the tape supply reel 1
5A and a tape take-up reel 15B, which are made of a synthetic resin material having excellent wear resistance,
The cylindrical reel hub 18 (18A, 18) around which the
B), the lower flange portion 16 (16A, 16B) integrally formed with the lower end of the reel hub 18, and the reel hub 1
Upper flange portion 17 (17A,
17B).

The tape reel 15 constructed in this way
Is a tape reel storage unit 1 formed on the inner surfaces of the upper half 6 and the lower half 7 of the tape cassette 1 which face each other.
Each is stored rotatably in one. Tape reel 1
The magnetic tape 3 wound around the tape 5 is guided from the one tape supply reel 15A through the guide roller 25A to the tape guide 30A and guided to the loading space 35. And the magnetic tape 3 is the other tape guide 3
0B is wound around the tape winding reel 15B by the guide roller 25B.

The magnetic tape 3 has transparent leader tapes 4 which are joined to both ends of the magnetic tape 3 to indicate both ends and ends of the magnetic tape 3 via splicing tapes. The leading end portions of these leader tapes are fixed by being inserted into the engaging portions provided on the reel hub 18. Then, the leader tape 4 is detected by a tape start end detection mechanism and a tape end end detection mechanism (not shown).

The tape cassette 1 configured as described above
Inside the cassette body 5, a tape slack preventing mechanism 40 is provided on the front surface. Tape slack prevention mechanism 40
Feeds the magnetic tape 3 from the tape supply reel 15A into the loading space 35, and the loading space 35
A pair of guide rollers 25 for winding the tape from the tape take-up reel 15B to the tape take-up reel 15B, and the support member 4 provided near the loading space forming wall 8 at both ends of the loading space 35.
6, a slack preventing member 41 for urging the magnetic tape 3 running between the guide roller 25 and the supporting member 46 toward the guide roller 25, a loading space forming wall 8 into which the slack preventing member 41 is inserted, and a supporting member. It is provided between 46 and
The slack prevention member 41 is configured by an insertion groove 50 that is incorporated in an arc shape. And the tape slack prevention mechanism 4
No. 0 is characterized in that a slack prevention rib 55 is provided in the insertion groove 50 of the slack prevention member 41. The tape slack preventing mechanism on the tape take-up reel 15B side will be described below in particular.

The slack preventing member 41, as shown in FIG.
The slack preventing member 41 has a substantially rectangular shape as a whole and is made of a material having elasticity, such as a polyester film. The slack prevention member 41 has an insertion groove 50 described later.
A neck portion 42 for fitting with the fitting portion 51 on the side is provided. The slack prevention member 41B has a tip portion 43.
Is formed to have a linear shape and urges the magnetic tape 3 passing between the guide roller 25B and the support member 46 toward the guide roller 25B. An ultra-high polymer PE sheet is used on the surface of the tip portion 43 of the slack prevention member 41. The ultra-high polymer PE sheet used for the tip portion 43 of the slack prevention member 41 prevents the magnetic tape 3 from sticking to the surface of the slack prevention member 41, and stabilizes the running of the magnetic tape 3. Further, since the slack preventing member 41 urges the magnetic tape 3 toward the guide roller 25B, the slack preventing member 41 prevents the magnetic tape 3 from slacking during traveling.

Support member 4 which constitutes an insertion groove 50 described later.
6B is formed in a substantially cylindrical shape and includes an upper half 6 and a lower half 7.
Used as a boss when fixing and.

The slack prevention member 41 formed in this way
3, is inserted into the insertion groove 50 of the loosening prevention member 41 provided on the lower half 7 side. This insertion groove 5
0 is provided between the loading space forming wall 8 and the support member 46. Further, a rising wall 52 is provided at the innermost end of the insertion groove 50 so as to connect the loading space forming wall 8 and the support member 46 to each other. Furthermore, the insertion groove 5
At the other end of 0, the neck portion 42 of the slack prevention member 41
The fitting portion 51 is provided so that Then, in the insertion groove 50, the slack preventing ribs 5 are provided along the loading space portion constituting wall 8 around the corner portion 58 where the rising wall 52 and the loading space portion constituting wall 8 which will be described later are connected.
5 are provided.

The slack preventing member 41 is inserted into the insertion groove 50 formed as described above along the supporting member 46 in an arc shape. At this time, the slack prevention member 41 makes the tip end portion 43 contact the guide roller 25B, and the other end portion 44 is a rising wall provided at the innermost end of the loading space forming wall 8 and the insertion groove 50. Corner portion 58 connecting 52
It is inserted so as to hit.

The loosening prevention member 41 inserted in the insertion groove 50
Since the slack prevention rib 55 is provided, the curvature of the slack prevention member 41 increases, and the slack prevention member 41 is steadily regulated in the insertion groove 50. Therefore, the slack prevention member 41 is prevented from being displaced in the insertion groove 50 due to the vibration of the magnetic tape 3 during traveling. Then, the tip end portion 43 of the slack prevention member 41 is
By always contacting the magnetic tape 3, the slack of the magnetic tape 3 during the running of the magnetic tape 3 is prevented. Further, in the tape slack prevention mechanism 40, the structure of the tape slack prevention mechanism 40 is strengthened by integrally providing the slack prevention rib 55 on the loading space forming wall 8.

The tape cassette 1 constructed as described above
When loaded in the recording and / or reproducing apparatus, the lid structure 2 is driven by the lid driving means on the recording and / or reproducing apparatus side.
0 is rotated to open the front surface of the cassette body 5. Then, in the tape cassette 1, the tape loading means on the recording and / or reproducing device side enters the loading space 35 of the cassette body 5, and the magnetic tape 3 is pulled out from the cassette body 5 and on the recording and / or reproducing device side. The recording and / or reproducing unit is loaded.

When the tape cassette 1 is loaded in the recording and / or reproducing section of the recording and / or reproducing apparatus, the tape start end detection mechanism and the tape end detection mechanism detect the tape start end and the tape end end. . The tape start end detection mechanism and the tape end end detection mechanism are each configured by an optical detection unit including a light emitting element and a light receiving element. And
The tape start end detection mechanism and the tape end detection mechanism guide the detection light emitted from the light emitting element of the optical detection unit to the surface of the magnetic tape 3 by the prism. In the tape start end detection mechanism and the tape end detection mechanism, when the magnetic tape 3 is driven to the start end or the end and the transparent leader tape 4 comes to the corresponding position, the detection light emitted from the light emitting element is received by the light receiving element side. As a result, the start of the tape or the end of the tape is detected.

In the tape cassette 1, the tape reel 15 is rotationally driven via the reel drive shaft by the recording and / or reproducing operation of the recording and / or reproducing device. The magnetic tape 3 wound around the tape supply reel 15A is the guide roller 25 on the tape supply reel 15A side.
Through A, the tape is loaded to the outside of the cassette body 5 by the tape loading means on the recording and / or reproducing apparatus side.
Then, the magnetic tape 3 is recorded and / or reproduced.

On the other hand, the magnetic tape 3 fed by the tape loading means on the recording and / or reproducing device side is
It is wound around the tape take-up reel 15B via the guide roller 25B on the side of the tape take-up reel 15B.

At this time, the tape slack prevention mechanism 40 presses the running magnetic tape 3 toward the guide roller 25 by the slack prevention member 41. Therefore, the slack prevention member 41 can steadily prevent the slack of the magnetic tape 3 during traveling.

The same members as those in the tape cassette 1 according to the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

The tape cassette 6 according to the second embodiment
0 has a structure almost similar to that of the tape cassette 1 according to the first embodiment. As shown in FIG. 4, the tape slack prevention mechanism 40 of the tape cassette 60 has an insertion groove 50.
Is formed by providing a slack prevention rib 62 around the periphery of the support member 46, leaving only a minimum space in which the slack prevention member 41 can be inserted. Then, the slack prevention member 41 is formed in the insertion groove 50 formed in this way, and the end portion 44 of the slack prevention member 41 is similar to the tape cassette 1 according to the first embodiment.
Is abutted against the corner portion 58 and inserted. On the other hand, the insertion groove 5
The tip portion 43 of the slack prevention member 41 exposed from 0 urges the traveling magnetic tape 3 toward the guide roller 25.

Thus, the slack prevention member 41 is provided with the slack prevention rib 62 so as to increase the curvature and is inserted into the insertion groove 50 so as to be regulated steadily, and to prevent the magnetic tape 3 from being displaced due to vibration during running. To do. Therefore, the magnetic tape 3 is steadily pressed in the direction of the guide roller 25 by the slack preventing member 41, and the slack during traveling is prevented.
In addition, the structure of the tape slack prevention mechanism 40 is strengthened by providing the slack prevention ribs 62 on the loading space forming wall 8 forming the insertion groove 50 of the tape slack prevention mechanism 40.

Tape cassette 6 according to the third embodiment
5 also has substantially the same configuration as the tape cassette 1 according to the first embodiment. This tape cassette 6
As shown in FIG. 5, the tape slack prevention mechanism 40 of No. 5 is characterized in that a slack prevention rib 67 is provided along the rising wall 52 in the insertion groove 50 of the slack prevention member 41. That is, the tape slack preventing member 41 of the tape cassette 65 is
The corner portion 58 connecting the loading space forming wall 8 and the rising wall 52 is connected to the insertion groove 5 by the loosening prevention rib 67.
It is provided inside 0. Then, the slack prevention member 41 is inserted into the insertion groove 50 formed in this way by abutting the end portion 44 of the slack prevention member 41 to the corner portion 58, similarly to the tape cassette 1 according to the first embodiment. It On the other hand, the tip end portion 43 of the slack prevention member 41 exposed from the insertion groove 50
Urges the traveling magnetic tape 3 toward the guide roller 25.

As a result, the slack prevention member 41 is inserted into the insertion groove 50 with an increased curvature by being provided with the slack prevention rib 67, is regulated steadily, and is displaced due to vibration or the like while the magnetic tape 3 is running. Prevent. Therefore, the magnetic tape 3 is steadily pressed in the direction of the guide roller 25 by the slack preventing member 41, and the slack during traveling is prevented. Further, the structure of the tape slack prevention mechanism 40 is strengthened by providing the slack prevention rib 67 along the rising wall 52 provided in the insertion groove 50 of the tape slack prevention mechanism 40.

Tape cassette 7 according to the fourth embodiment
0 also has substantially the same configuration as the tape cassette 1 according to the first embodiment. Tape slack prevention mechanism 4
As shown in FIG. 6, the insertion groove 50 of No. 0 is characterized in that a slack preventing rib 72 is provided along the loading space portion constituting wall 8. Then, the insertion groove 50 formed in this way
Similarly to the tape cassette 1 according to the first embodiment, the slack prevention member 41 is inserted by abutting the end portion 44 of the slack prevention member 41 against the corner portion 58. On the other hand, the tip portion 43 of the slack prevention member 41 exposed from the insertion groove 50 urges the running magnetic tape 3 toward the guide roller 25.

As a result, the slack prevention member 41 is provided with the slack prevention rib 72 so that the slack prevention rib 41 is inserted into the insertion groove 50 with an increased curvature and is regulated steadily, and is displaced due to vibration or the like while the magnetic tape 3 is running. Prevent. Therefore, the magnetic tape 3 is steadily pressed in the direction of the guide roller 25 by the slack preventing member 41, and the slack during traveling is prevented. Further, the structure of the tape slack prevention mechanism 40 is strengthened by providing the slack prevention rib 72 along the rising wall 52 provided in the insertion groove 50 of the tape slack prevention mechanism 40.

Tape cassette 8 according to the fifth embodiment
0 has almost the same structure as the tape cassette 1 according to the first embodiment. The tape slack prevention mechanism 40 of the tape cassette 80 includes the neck portion 4 of the slack prevention member 41.
When the 2 is inserted into the insertion groove 50, the neck portion 42 of the slack prevention member 41 is abutted against the loading space forming wall 8. That is, the slack prevention member 41 is abutted against the corner portion 58, the guide roller 25A, and the corresponding neck portion 42 of the slack prevention member 41 at three points on the corresponding loading space portion constituting wall 8 in a state of being inserted into the insertion groove 50. By being supported, it is supported and regulated. Therefore,
In the insertion groove 50 of the slack prevention mechanism of the tape cassette of the present embodiment, when the slack prevention member 41 is inserted, the tape slack prevention of the tape cassette described as the above embodiment is surely supported at three points. As with the mechanism, a slack prevention rib may be provided. In the tape cassette 80 described as the fifth embodiment, the case where the neck portion 42 of the slack prevention member 41 is abutted against the loading space portion constituting wall 8 has been described as an example. It suffices that any one of the parts is abutted against any part of the loading space forming wall 8.

The slack prevention rib provided in the insertion groove 50 of the tape slack prevention mechanism 40 may be provided at a position where the slack prevention member 41 can be regulated. What is the mounting position and size of the slack prevention rib? It may be one.

Further, the tape slack prevention mechanism 40 of the tape cassette described in the above-mentioned embodiment has been described with respect to the tape slack prevention mechanism 40 on the tape take-up reel side, but the tape slack prevention mechanism on the tape supply reel side is applied. Of course, it is okay.

Furthermore, although the tape cassette of the embodiment according to the present invention has been described by using the tape cassette for the video tape recorder, it can be applied to all the tape cassettes having the same structure such as the cleaning tape cassette. Of course.

[0055]

As described in detail above, according to the tape cassette of the present invention, the slack prevention member of the tape slack prevention mechanism is steadily provided with the slack prevention rib provided in the insertion groove of the slack prevention member. Regulated. In addition, since the slack prevention rib is provided in the insertion groove for inserting the slack prevention member of the tape slack prevention mechanism, the curvature of the slack prevention member is increased, and the magnetic tape is pressed toward the guide roller to further prevent slack. can do. As a result, the magnetic tape is prevented from being loosened by the loosening prevention member during running, and recording and / or reproduction is performed in a stable state. Further, since the slack prevention rib is integrally connected to the loading space portion constituting wall and the rising wall at the insertion portion of the tape slack prevention mechanism, the structure of the tape slack mechanism is strengthened.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a tape cassette according to a first embodiment of the present invention.

FIG. 2 is a front view of a loosening prevention member of the tape cassette.

FIG. 3 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of the tape cassette.

FIG. 4 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of a tape cassette according to a second embodiment of the present invention.

FIG. 5 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of a tape cassette according to a third embodiment of the present invention.

FIG. 6 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of a tape cassette according to a fourth embodiment of the present invention.

FIG. 7 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of a tape cassette according to a fifth embodiment of the present invention.

FIG. 8 is an exploded plan view excluding the upper half of a conventional tape cassette.

FIG. 9 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of the tape cassette.

FIG. 10 is a lateral cross-sectional view of a main part of a tape slack preventing mechanism of the tape cassette.

FIG. 11 is a transverse cross-sectional view of a main part of a tape slack preventing mechanism of the tape cassette.

[Explanation of symbols]

 1 tape cassette 3 magnetic tape 5 cassette body 6 upper half 7 lower half 8 loading space part wall 15 tape reel 20 lid structure 25 guide roller 30 tape guide 40 tape loosening prevention mechanism 41 loosening prevention member 42 neck portion 46 support member 50 insertion Groove 52 Rising wall 55 Sag prevention rib

Claims (2)

[Claims] 1. A tape cassette provided with a tape slack preventing mechanism for preventing slack of a magnetic tape fed from a tape reel rotatably housed inside the cassette main body by combining upper and lower halves. In the tape slack prevention mechanism, a pair of guide rollers for feeding the magnetic tape from the tape supply reel to the loading space and winding the magnetic tape from the loading space to the tape take-up reel are provided at both ends of the loading space. A support member provided near the constituent wall, a slack preventing member for urging the magnetic tape traveling between the guide roller and the support member toward the guide roller, and a support member provided between the loading space accommodating wall and the support member. And an insertion groove in which a slack prevention member is incorporated in an arc shape, and a slack prevention is provided in the insertion groove. Tape cassette, characterized in that the loosening prevention rib for restricting the wood to abut against the innermost end is provided. 2. The tape slack preventing member, in addition to the one end portion which is abutted against the innermost end of the insertion groove, has at least a portion which is abutted against a wall forming the loading space portion which constitutes the insertion groove. The tape cassette according to claim 1, wherein the tape cassette is a tape cassette.