JPH06295555A - Tape cassette - Google Patents

Abstract

PURPOSE:To provide a tape cassette by which the tightly winding effect to a tape reel is ensured, the locking action of a pair of tape reels is made independent, excessive tension is not applied to a magnetic tape, and the burden in the design of a mechanical part is lessened. CONSTITUTION:An S lock piece 1 and a T lock piece 2 are arranged on the aperture part side of a cassette main body, and the moving path of a pawl part 3 is regulated by a cam surface 9, so that the tightly winding effect of the magnetic tape 4 by the S tape reel 5 and the T tape reel 6 is ensured. Since the locking action by the S lock piece 1 and the T lock piece 2 is made independent, there is no possibility that locking is released by impact, and further the excessive tension is not applied on the magnetic tape 4 even when the magnetic tape 4 is elongated or contracted because of environmental change.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette in which a front face opening is provided in the front face of a cassette body for accommodating a pair of tape reels around which a magnetic tape is wound, and the magnetic tape is suspended along the front face opening. It is a thing.

[0002]

2. Description of the Related Art In recent years, technological development competition for reducing the size and weight of magnetic recording / reproducing devices is intensifying, and there is an increasing need to reduce the size and weight of mechanical parts. Along with this, there is an increasing need for tape cassettes to be smaller and lighter, and there is a demand for tape cassettes with a simpler mechanism.

A conventional tape cassette will be described below. FIG. 7 is a front view of this conventional tape cassette, FIG. 8 is a detailed plan view of the reel lock portion and its periphery, and FIG. 9 is FIG.
It is a sectional view of the AA 'part in the inside. 7 to 9, 1a is a lock piece, 3 is a lock piece 1
a claw portion provided at the tip end portion, 4 is a magnetic tape, 5a and 5b are tape reels, 7 is an engaging tooth portion provided on the outer periphery of the tape reels 5a and 5b, and 8 is a spring for urging the lock piece 1a. , 9 is a lock piece sliding flat surface regulation guide portion provided on the tape cassette main body, 10 is an inclined surface provided at the lower portion of the lock piece, and 11 is a reel lock releasing member provided on the mechanism portion side.

The operation of the tape cassette constructed as above will be described below.

First, the lock piece 1a is urged toward the front surface of the cassette by the spring 8, and at this time, the claw portion 3 pushes the engaging tooth portion 7 outward from the front surface of the cassette, and the tape reel 5a.
To prevent the magnetic tape 4 from rotating in the feeding direction.

Next, when the cassette is loaded into a VTR or the like and descends in the direction of arrow A, the reel lock releasing member 11 provided on the mechanism side abuts the inclined surface 10 and urges it toward the front surface of the cassette. The reel lock is released by moving the lock piece 1a thus moved toward the rear surface of the cassette to disengage the claw portion 3 from the engagement tooth portion 7.

[0007]

However, in the above-mentioned conventional configuration, the claw portion 3 pushes the engaging tooth portion 7 toward the outside of the front surface of the cassette, whereby the tape reel 5a is rotated in the feeding direction of the magnetic tape 4. However, since the tape reel 5a moves toward the outside of the front surface of the cassette, the magnetic tape 4 sags along the front opening of the cassette, which causes a problem of tape damage.

Further, since the lock operation of the pair of tape reels 5a and 5b is performed by one lock piece 1a, the lock operation of the tape reel 5a on the supply side and the lock operation of the tape reel 5b on the winding side are interlocked. , The engaging tooth portion 7 moves due to the impact on one tape reel, and the locking piece 1a moves in conjunction with it, so that the engaging tooth portion 7 and the claw portion 3 of the other tape reel are engaged with each other. There is also a problem that the magnetic tape 4 comes off and sags.

Further, when the magnetic tape 4 along the front opening of the cassette contracts due to environmental changes, the tape reel 5a.
Is locked by the lock piece 1a, and the change in tension of the magnetic tape 4 in the portion of the magnetic tape 4 along the cassette front opening is difficult to be transmitted to the lock piece urging spring 8. There is a possibility that it will be left in a state where a tension exceeding the allowable tension is applied.

Further, since the lock piece 1a is arranged in the rear portion of the center of the cassette, the lock releasing member 1 on the mechanism side is provided.
1 must be arranged at the corresponding position, and the corresponding position on the mechanism side is a position where a large number of parts related to the reel drive system are present, which imposes a heavy burden on the design of the mechanism.

The present invention solves the above-mentioned problems of the prior art by ensuring the tightening effect of the tape reel, making the locking operation of the pair of tape reels independent, and not applying an excessive tension to the magnetic tape. It is an object of the present invention to provide a tape cassette that has a low design burden.

[0012]

In order to achieve this object, a tape cassette of the present invention has an S wound with a magnetic tape.
A tape cassette in which a front opening is provided in the front surface of a cassette body for storing tape reels and T-tape reels, and a magnetic tape is hung along the front opening, and the tape cassette is rotatably mounted inside the front opening on the cassette body. S lock piece and T lock piece provided, claw portions provided at the tip thereof, engaging tooth portions provided on the S tape reel and T tape reel, lock release holes provided on the cassette body, and S lock Urging means for the piece and the T-lock piece,
The claw portion engages with the engaging tooth portion in a direction that prevents the magnetic tape from rotating in the feeding direction by using the S tape reel and the T tape reel, and the biasing means causes the claw portion to engage the engaging tooth portion with the magnetic tape. It has a configuration in which the S lock piece and the T lock piece are biased so as to rotate the S tape reel and the T tape reel in the winding direction.

[0013]

As described above, according to the present invention, the lock piece is arranged inside the opening on the front surface of the cassette, and the claw portion at the tip of the lock piece urges the tape reel toward the rear outside of the cassette, so that a reliable winding tightening effect can be obtained. Supply tape reel by making the movement of a pair of lock pieces independent of each other,
The structure that secures the lock operation of the take-up tape reel and can be absorbed by the biasing means of the lock piece due to the positional relationship between the lock piece and the reel even if the tape shortens due to environmental changes. The burden on the department design is small.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a tape cassette according to an embodiment of the present invention when it is locked, and FIG. 2 is a detailed view thereof.
3 is a sectional view thereof, FIG. 4 is a front view when unlocking, FIG. 5 is a detailed view thereof, and FIG. 6 is a sectional view thereof. Figure 1
In FIG. 6, 1 is an S lock piece, 2 is a T lock piece, 3 is a claw portion provided at the tip of the S lock piece 1 and the T lock piece 2, 4 is a magnetic tape, 5 is an S tape reel, and 6 is T. A tape reel, 7 is an engaging tooth portion provided on the outer periphery of the S tape reel 5 and the T tape reel 6, and 8 is an S tooth.
A spring for biasing the lock piece 1 and the T lock piece 2,
9 is a cam surface provided inside the cassette front opening, 10
Is an inclined surface provided in the lower part of the S lock piece 1 and the T lock piece 2, 11 is a lock release hole provided in a portion corresponding to the inclined surface 10 on the cassette body, and 20 is provided on the mechanism side. An unlocking member, 21 is an inner wall of the cassette half, and 22 is a convex portion provided on the cassette body.

In this embodiment, as shown in FIG. 1, a front opening is provided on the front surface of the cassette body which houses the S tape reel 5 and the T tape reel 6 on which the magnetic tape 4 is wound, and the magnetic tape 4 is hung along the front opening. In the tape cassette shown in FIG. 2, the S lock pieces 1 and T
The lock piece 2 is rotatably mounted, and the spring 8 is mounted thereon. At this time, the S lock piece 1 is urged counterclockwise by the spring 8 and the T lock piece 2 is urged clockwise by the claw portion 3 provided at the tip portion of the S lock piece 1.
Applies a counterclockwise rotational force to the engaging tooth portion 7 provided on the outer peripheral portion of the S tape reel 5, and the claw portion 3 provided on the tip end portion of the T lock piece 2 has an outer peripheral portion of the T tape reel 6. A clockwise rotating force is applied to the engaging tooth portion 7 provided on the. Further, at this time, the claw portion 3 has its movement path regulated by the cam surface 9, and acts so as to urge the S tape reel 5 and the T tape reel 6 to the rear rear side of the cassette through the engagement tooth portion 7. At this time, the S tape reel 5 and the T tape reel 6 move until the engaging tooth portion 7 contacts the cassette half inner wall 21.

Next, as shown in FIG. 6, the cassette is loaded into the VTR or the like, and the lock releasing member 20 provided on the mechanism side is inserted into the cassette body through the lock releasing hole 11, whereby the S lock piece 1 and By contacting the inclined surface 10 provided at the lower portion of the T lock piece 2, the S lock piece 1 rotates clockwise around the convex portion 22 in FIG. 5, and the T lock piece 2 rotates around the convex portion 22 as a center. By rotating in the counterclockwise direction, the claw portion 3 and the engaging tooth portion 7 are disengaged from each other, and the S tape reel 5 and the T tape reel 6 are rotatable.

When an impact is applied from the outside of the cassette, even if the T tape reel 6 moves inside the cassette due to the impact, the engaging tooth portion 7 of the T tape reel 6 and the engaging portion of the claw portion 3 move. However, the engagement tooth portion 7 of the S tape reel 5 and the engagement of the claw portion 3 are not affected.

Further, when the magnetic tape 4 stretched along the front opening is shrunk due to environmental changes, the engaging tooth portions 7 of the S tape reel 5 and the T tape reel 6 push the claw portion 3 to cause the S lock piece. 1 and the T lock piece 2 are pushed back against the urging force of the spring 8, and the magnetic tape 4 hung along the front opening is not subjected to excessive tension.

As described above, according to this embodiment, the S-lock piece 1 and the T-lock piece 2 are arranged on the cassette body opening side, and the movement path of the claw portion 3 is regulated by the cam surface 9 so that the S-tape is formed. The effect of tightening the magnetic tape 4 by the reel 5 and the T tape reel 6 is ensured, and the lock operation by the S lock piece 1 and the T lock piece 2 is independent, so there is no possibility of unlocking due to impact. Further, even if the magnetic tape 4 expands or contracts due to environmental changes, the magnetic tape 4 is not overtensioned.

[0021]

As described above, according to the present invention, the front face opening is provided in the front face of the cassette body for storing the S tape reel and the T tape reel around which the magnetic tape is wound, and the magnetic tape is laid along the front face opening. A tape cassette having an S-lock piece and a T-lock piece, which have a convex portion on the cassette body and are rotatably mounted on the convex portion, a claw portion provided at the tip thereof, an S-tape reel, and a T-tape reel The engaging tooth portion provided on the outer periphery, the cam surface provided inside the front opening, the lock release hole portion provided on the cassette body, the spring for urging the S lock piece and the T lock piece, and the claw portion Engages the S-tape reel and the T-tape reel with the engaging tooth portion in a direction that prevents the magnetic tape from rotating in the feeding direction, and the spring causes the claw portion to engage the engaging tooth with the magnetic tape to wind the magnetic tape. Over T S so as to rotate the tape reel
By urging the lock piece and T-lock piece so that the cam surface regulates the movement path of the claw part, the effect of tightening the winding of the magnetic tape is ensured, and there is no possibility of unlocking due to impact, and the magnetic tape is not affected by environmental changes. It is possible to provide a tape cassette in which excessive tension is not applied to the magnetic tape even when expansion and contraction occur.

[Brief description of drawings]

FIG. 1 is a front view of a tape cassette according to an embodiment of the present invention when the tape cassette is locked.

FIG. 2 is a detailed view of the tape cassette of the embodiment when locked.

FIG. 3 is a cross-sectional view of the tape cassette according to the embodiment when locked.

FIG. 4 is a front view of the tape cassette according to the embodiment when the lock is released.

FIG. 5 is a detailed view when the tape cassette is unlocked in the embodiment.

FIG. 6 is a sectional view of the tape cassette according to the embodiment when the lock is released.

FIG. 7 is a front view of a conventional tape cassette.

FIG. 8 is a detailed view of a reel lock portion of a conventional tape cassette.

FIG. 9 is a sectional view of a reel lock portion of a conventional tape cassette.

[Explanation of symbols]

 1 S lock piece 2 T lock piece 3 Claw part 4 Magnetic tape 5 S tape reel 6 T tape reel 7 Engaging tooth part 8 Spring 9 Cam surface

Claims (2)

[Claims] 1. A tape cassette in which a front opening is provided in a front surface of a cassette body for storing an S tape reel and a T tape reel wound with a magnetic tape, and the magnetic tape is hung along the front opening. An S lock piece and a T lock piece rotatably mounted on the inside of the front opening on the cassette body, a claw portion provided at the tip of the S lock piece and the T lock piece, the S tape reel, The engaging tooth portion provided on the T tape reel, the lock release hole portion provided on the cassette body, and the biasing means for the S lock piece and the T lock piece are provided, and the claw portion is the The S tape reel and the T tape reel are engaged with the engaging tooth portion in a direction that prevents the magnetic tape from rotating in the feeding direction, and the biasing means causes the pawl portion to engage the engaging tooth portion. A tape cassette characterized in that the S lock piece and the T lock piece are urged so as to rotate the S tape reel and the T tape reel in the winding direction of the magnetic tape. 2. The tape cassette according to claim 1, wherein a cam surface is provided on the cassette body, and the cam surface regulates a movement path of the claw portion.