JP2514507B2 - Tape cartridge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge provided with reel brake means for stopping the rotation of a tape reel when not in use, and an improvement of the brake release system of the reel brake means.

[0002]

2. Description of the Related Art In the present invention, a brake piece 21 is rotatably mounted around a vertical axis 13 in a main body case 1, and when not in use, the brake piece 21 is attached to a tape reel by a tip claw portion 21b of the brake piece 21. The tape reel 3 is prevented from rotating by urging the tape reel 3 in such a manner as to be in abutting engagement with the outer circumference of the flange of the tape reel 3. Then, the intermediate transmission member 22 is mounted inside the main body case 1, and when the intermediate transmission member 22 is mounted on the deck, the intermediate transmission member 22 is urged by the release member 29 on the deck side. It is known to rotate the tape reel 3 so as to separate it from the outer periphery of the flange of the tape reel 3 so that the tape reel 3 can freely rotate (for example, in Japanese Utility Model Publication No. 60-
17106).

[0003]

FIG. 7 shows a conventional reel brake means. The problem is the intermediate transmission member 31 used there. The conventional intermediate transmission member 31 has a horizontal piece 31a and a vertical piece 31b and is substantially L-shaped in a side view, and is mounted to be swingable back and forth around a horizontal horizontal shaft 32. Then, when the release member on the deck side pushes up the horizontal piece 31a through the release hole 15 opened in the case bottom wall 4,
The vertical piece 31b is tilted rearward about the horizontal axis 32 to push the operating piece 33 on the side of the brake piece 21 to rotate the entire brake piece 21 to the brake release position.

In such a conventional form, a space on a horizontal surface is required for swinging the vertical piece 31b of the intermediate transmission member 31, and it is impossible to install the tape cartridge in a more restricted space such as miniaturization of the tape cartridge. Brake piece 21
May result in poor release. Further, there is a disadvantage in that the pair of brake pieces 21, 21 engaging with the left and right tape reels 3, 3 are separated and pivotally supported individually. Further, the operating piece 33 on which the vertical piece 31b abuts has to be extended to the side of the brake piece 21 and the shape is complicated. The present invention has been proposed in order to eliminate such a conventional problem.
An object of the present invention is to obtain a tape cartridge provided with reel brake means which requires as little space as possible on a horizontal plane. An object of the present invention is to obtain a tape cartridge provided with a reel brake means which can be simplified in shape and structure and can be made as small in the number of parts as possible.

[0005]

A conventional problem is that the intermediate transmission member is swung in a horizontal plane. If the intermediate transmission member can be moved only in the vertical direction within the main body case, the brake piece can be rotated. it can. From this point of view, the present invention mounts the intermediate transmission member 22 in the main body case 1 so as to be vertically movable. However, a part of the intermediate transmission member 22 is linked with a part of the brake piece 21 which is rotatable around the vertical axis 13 so as to be abuttingly engaged from below. The intermediate transmission member 22 is pressed and urged by a spring member 24 so as to always be in a lowered posture, and in this state, the tip end claw portion 21b of the brake piece 21 is always engaged with the tape reel 3.
The tape reel 3 is urged to rotate by 3 so as to maintain the detent of the tape reel 3 when not in use.

Thus, when the release member 29 on the deck side is thrust into the case through the release hole 15 provided in the bottom wall 4 of the main body case 1, the thrust force of the release member 29 is received and the intermediate transmission member is received. 22 rises, and this intermediate transmission member 22
With this, the brake piece 21 can be rotated in the direction in which the tip claw portion 21b of the brake piece 21 is detached from the tape reel 3. Specifically, a downward receiving surface 28 is provided on the brake piece 21 side, and an upward receiving surface 27 that abuts and engages with the receiving surface 28 from below is formed on the intermediate transmission member 22 side in an inclined shape. When the intermediate transmission member 22 is pushed up,
The received surface 28 is slid along the inclined receiving surface 27, whereby the brake piece 21 is forcibly rotated in the brake releasing direction.

[0007]

According to the present invention, the intermediate transmission member 2 is provided.
Since No. 2 moves up and down, no working space is required in the horizontal plane. Moreover, the intermediate transmission member 22 is the brake piece 2
It will be arranged so as to partially wrap in the rotation region of 1.
Therefore, the reel brake means 1 can be used even in a limited space.
1 can be arranged without difficulty, and the moving stroke of the intermediate transmission member 22 can be sufficiently secured in the vertical direction in the main body case 1, so that the brake can be effectively released. Further, the brake piece 21 and the intermediate transmission member 22 can be mounted close to each other in a vertical arrangement relationship. Therefore, a pair of brake pieces 21, 21 acting on the left and right tape reels 3, 3 are rotatably supported around the common vertical axis 13, and both brake pieces 21, 21 are arranged between them. It is also possible that the intermediate transmission members 22 can be simultaneously released.
The simplification of the shape, simplification of the structure due to the reduction of the number of constituent parts, and improvement of the assembling workability can be expected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 5 show a first embodiment in which the present invention is applied to a small video tape cartridge. FIG. 5 is an overall plan view of the tape cartridge of the present invention with a part thereof cut away, and 1 is a plastic upper and lower case 1a.
-It is a main body case made by abutting 1b. Tape reels 3, 3 around which the tape 2 is wound are positioned on the drive shaft insertion holes opened in the case bottom wall 4 and rotatably accommodated in the left and right inside of the main body case 1. The tape 2 is led out from one tape reel 3 into a tape loading pocket 6 on the front surface side of the case, and the other tape reel 3
To be wound up. The tape 2 led out to the pocket 6 is
When not in use, a front lid 8 with a back lid 7 mounted on the front side of the main body case 1 so as to be openable and closable covers and protects the front and rear surfaces thereof.

A space S having a substantially triangular shape in a plan view is provided between the case front wall 10 for partitioning the reel accommodating chamber and the pocket 6 and the left and right tape reels 3 in the main body case 1. The reel brake means 11 is arranged in the space S. 1 to 4 show the reel brake means 1
1 shows the case bottom wall 4 in the space S.
The inner surface of the boss 12 is on the front side and the vertical axis 13 is on the rear side.
And a release hole 15 penetrating inside and outside is provided in front of the boss 12 in the case bottom wall 4. The boss 12 in the figure is a screw fastening boss having a screw insertion hole 16, and a screw pilot hole 17 protruding from the inner surface of the upper case 1a.
An attached boss 19 is fitted to the upper end of the boss 12, and the upper and lower cases 1a and 1b are also fastened at corresponding portions by a tapping screw 20 guided from the lower side of the case. As an assembly member that constitutes the reel brake means 11, a pair of left and right brake pieces 21, 21, an intermediate transmission member 2
2, and two spring members 23 and 24 are prepared.

Each brake piece 21 has a cylindrical boss portion 21a on the base end side and a claw portion 21b on the tip end. The left and right brake pieces 21, 21 are fitted to the vertical axis 13 from above in a state where the boss portions 21a, 21a are vertically overlapped with each other, and are rotatable around the vertical axis 13, and more than the vertical axis 13. Tip claws 21b, 21b located on the front side of the case
But the lower flanges 3a, 3 of the left and right tape reels 3, 3
It is possible to rotationally displace between the brake posture in which the outer peripheral engagement teeth 25 of 25a are in abutting engagement and the brake release posture in which the engagement teeth 25 are disengaged. The spring member 23 acting on the both brake pieces 21 is provided with the locking arm 2 from both ends of the intermediate coil portion 23a.
It consists of a torsion coil spring that continuously extends 3b and 23b, and the intermediate coil portion 23a is fitted on the vertical axis 13, and each locking arm 2
3b and 23b are hooked on the left and right brake pieces 21 and 21, respectively, so that the brake pieces 21 and 21 are constantly urged to rotate in the braking posture.

The intermediate transmission member 22 has a cylindrical boss portion 22a, and the linking arms 22b.
The release arms 22c are integrally connected to the front of the release hole 2b, and the boss portion 22a is vertically movably fitted to the boss 12 from above in a state where the release arm 22c faces directly above the release hole 15. In the middle of each brake piece 21, an opening 26 is cut out from the lower end edge, and in the mounted state in which the intermediate transmission member 22 is fitted to the boss 12, the left and right linkage arms 22b are moved to the left and right brake pieces 21 respectively. The opening 2
6 is inserted in the width direction with some flexibility. In the figure, the interlocking arm 22b is engaged with the opening 26 to restrict the intermediate transmission member 22 from rotating around the boss 12. In this regard, it goes without saying that the intermediate transmission member 22 may be fitted to the boss 12 in a non-rotating manner but only vertically movable. It should be noted that the upper ends of the linking arms 22b are formed on the receiving surface 27 that is inclined downward toward the boss 22a, and the upper ends of the openings 26 of the brake pieces 21 are received and supported by the receiving surface 27. That is, the receiving surface 28 faces downward. The spring member 24 acting on the intermediate transmission member 22 is composed of a compression coil spring, is fitted on the upper end of the boss 12, and is interposed between the inner surface of the upper case 1a and the boss portion 22a of the intermediate transmission member 22. The whole 22 is always biased downward.

Next, the operation of the reel brake means 11 of the present invention will be described. When not in use, the spring member 2 is as shown in FIG.
The intermediate transmission member 22 descends due to the elastic force of 4,
The release arm 22c closes the transparent release hole 15 on the case bottom wall 4 to prevent dust from entering the case through the release hole 15. Then, the left and right brake pieces 21 receive the elastic force of the spring member 23, and as shown in FIG. 1, the tip claw portions 21b of the left and right brake pieces 21 are in abutting engagement with the engaging teeth 25 on the outer periphery of the lower flange of the left and right tape reels 3, respectively. are doing. At this time, each brake piece 21 restricts each tape reel 3 from rotating in the tape winding direction A while rotating in the tape slack direction B in the manner of a bracing rod. Securely prevents the tape from rotating in the tape loosening direction B. Further, the engaging force of the tip end claw portion 21b to the tape reel 3 acts to push the tape reel 3 to the rear side of the case indicated by the arrow P, and in combination with these, the tape 2 is slackened to the front side of the case when not in use. It is effective in preventing it from coming out.

When the tape cartridge is loaded in the deck, the release member 29 on the deck side projects into the case from below the case through the release hole 15 and contacts the release arm 22c of the intermediate transmission member 22 to form the intermediate transmission member. The whole 22 is pushed up against the spring member 24. With the upward movement of the intermediate transmission member 22, the inclined receiving surface 27 of each linking arm 22b abuts the received surface 28 on the side of each brake piece 21 in a pushed up state. As a result, in the brake piece 21 whose upward movement is restricted, the receiving surface 28 has the boss 22a on the receiving surface 27.
The tape reel 3 is forcibly rotated around the vertical axis 13 against the spring member 23 in the direction of sliding down toward the end, that is, in the brake releasing direction in which the tip claw portion 21b is disengaged from the reel engaging tooth 25. Is released from the brake and becomes free rotation. The releasing member 29 in the figure utilizes a lamp that optically detects the tape end, and the reference symbol L in FIG. 5 indicates the detection optical path. When removing the tape cartridge from the deck, contrary to the above, the intermediate transmission member 22 receives the pressing force of the spring member 24 and returns to the original lowered posture, and accordingly, the brake piece 21 also presses the pressing force of the spring member 23. In response to this, it returns to the original braking posture.

(Second Embodiment) FIG. 6 shows a second embodiment of the reel brake means 11 according to the present invention. In this case, the case rear side wall 30 and the left and right tapes are formed in the rear left and right central portion of the main body case 1. First, the reel brake means 11 is provided in a substantially triangular space S'formed inside the reels 3 and 3.
The arrangement is substantially the same as that of the embodiment.

(Another embodiment) Although the whole of the illustrated example is as described above, the vertical axis 13 may also serve as a screw fastening boss instead of the boss 12. Of course, the boss for fastening the screw may be a boss having a screw hole. Each of the left and right brake pieces 21 may be separately arranged by providing separate intermediate transmission members 22 at left and right separated portions.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a main part of the first embodiment.

FIG. 4 is an exploded perspective view of reel brake means.

FIG. 5 is a partially cutaway plan view of the whole.

FIG. 6 is a plan view of an essential part showing a second embodiment.

FIG. 7 is a plan view of an essential part showing a conventional reel brake means.

[Explanation of symbols]

 1 Main Body Case 2 Tape 3 Tape Reel 4 Bottom Wall of Main Body Case 11 Reel Brake Means 12 Boss 13 Vertical Axis 15 Release Hole 21 Brake Piece 21a Brake Base End Boss 21b Brake Piece Tip Claw 22 Intermediate Transmission Member 22a Intermediate The boss portion 22b of the transmission member 22b The link arm 22c of the intermediate transmission member 22c The release arm 23, 24 of the intermediate transmission member 26 The spring member 26 The opening of the brake piece 27 The receiving surface 28 The receiving surface 29 The releasing member

Claims (2)

(57) [Claims] 1. A main body case 1 containing a tape reel 3 therein.
In the main body case 1, the base end boss portion 21a is rotatable about the vertical axis 13, and the front end claw portion 21b is engaged with and disengaged from the tape reel 3.
A means for urging the 1 to rotate so that it engages with the tape reel 3, and a vertically movable mount in the main body case 1,
It is provided with an intermediate transmission member 22 that abuts and engages with a part of the brake piece 21 from below, and means for pressing and urging the intermediate transmission member 22 downward.
Through the release hole 15 opened in the bottom wall 4 of the main body case 1
It is possible to push up the brake piece 21 and the intermediate transmission member 22 by pushing up the intermediate transmission member 22 by the release member 29 on the deck side which is rushed into the inside. Reel 3
A tape cartridge characterized in that the tape cartridge is in an engagement relationship of rotating in a direction of being separated from the tape cartridge. 2. A received surface 28 facing downward on the brake piece 21.
2. The tape cartridge according to claim 1, wherein the intermediate transmission member 22 is formed with an upward receiving surface 27 which is in contact with and engages with the received surface 28 from below.