JP2960178B2 - Tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
Magnetic tape cassettes for reproduction, especially video tape cassettes for winding tapes on reels, 8 mm tape cassettes,
It relates to a VHS cassette and other tape cassettes.

[0002]

2. Description of the Related Art At present, a magnetic tape cassette used in a PCM recording / reproducing apparatus for converting an analog signal such as an acoustic signal into a digital signal, for example, a PCM signal and recording or reproducing the same on a magnetic tape, has a magnetic tape wound thereon. The pair of reels is a brake member that engages and disengages with locking teeth formed on the reels so as to prevent loosening of the tape when the cassette is not used (during storage). In use, the reel brake is released by the brake release means from the recording / reproducing device, and the reels can freely rotate. In the conventional brake member, the release lever or another member in the cassette is supported by a support shaft or the like provided in the case, and is urged by a spring to move a release lever or another member in the cassette by a brake release means from the recording / reproducing device. It is known to use a tape cassette having a brake mechanism for releasing the interlocking of a brake member with another member.

[0003]

Since the conventional brake mechanism is provided between the two reels at the center position on the front lid side of the case, the installation area for the brake mechanism is small, and the amount of movement of the release lever is small. There is a problem that the rotation displacement of the reel brake cannot be accommodated in the area, and the rotation of the brake lever is also restricted to a small extent, and the braking action must be unstable, so it is satisfactory enough as a brake mechanism And the release lever operates according to the amount of movement of the brake release pin, resulting in a complicated configuration when the stroke of the brake release pin is long, especially when the area for the brake mechanism is narrow. However, there are problems such as difficulty in insertion and assembly into the case. The present invention is intended to eliminate these conventional problems, and stabilizes the braking action even if the brake mechanism is provided in a narrow area provided in the case, and provides an adequate and sufficient accuracy as a required brake mechanism. It is an object of the present invention to provide a tape cassette capable of exerting a simple braking function in a compact and easily assembled and manufactured form.

[0004]

SUMMARY OF THE INVENTION The present invention provides a first reel brake provided with a pair of tape reels for winding a tape in a case, engaging and disengaging locking teeth formed on each of the tape reels, and a second reel. In a tape cassette provided with a brake, the first reel brake that is engaged with and disengaged from one of the reel locking teeth includes a claw piece and an operating piece rotatably provided on a support shaft provided in a case, and The second reel brake, which engages with and disengages from the reel locking teeth, has a hollow cylindrical boss portion, a claw piece on the outer periphery of the boss portion, and an operation piece that comes into contact with the operating piece, and is further provided. A helical groove is formed on the inner periphery of the boss portion, and a concave notch to be inserted into a guide shaft erected near the brake release pin insertion hole formed in the case in the boss portion, and the helical groove is fitted into the helical groove. Slider with a convex part that fits Only, in which a spring for biasing the spring for urging the slider in a downward direction, the pawl of the reel brake in the brake locking state.

[0005]

In the video tape cassette of the present invention, when loaded into the recording / reproducing apparatus, the brake release pin P from the apparatus moves and enters the case 1 from the insertion hole 10, and further the second reel brake 4 is inserted from the lower surface portion to the boss portion 4 _1, spring 4 in contact with the lower surface of the slider 42
Increasing against 3, pawl boss portion 4 ₁ a force of the turning direction protrusions 42 ₁ while the guide slide in a spiral groove 40 of the slider 42 around the support shaft 41-out仂is rotated piece 4 ₂ to pivot away from the locking teeth 2 ₁ reel 2, engagement operating piece 4 ₃ and the actuating piece 3 ₃ via the even pawl 3 ₂ of the first reel brake 3 of the other against the spring 5 Tomeha 2 ₁ both reels 2 out than will be able to rotate freely. When the cassette is removed from the recording / reproducing apparatus, the brake release pin P
There slider 42 in the boss portion 4 ₁ out from the insertion hole 10 of the case 1 becomes free is pushed back by the spring 43, the first
Return conjunction Lille brakes 4 rotates by the biasing force of the spring 5 of the reel brake 3, the claw piece 3 ₂ and claw piece 4 ₂ and the reel 2 is engaged simultaneously to the locking tooth 2 ₁ of both reels 2 The rotation of the tape is regulated so that the tape is properly held without slack.

[0006]

EXAMPLES Referring to per FIGS. 1-5 Example embodiments of the present invention, a pair of reels 2 for winding the tape within the case 1, the locking teeth 2 ₁ formed in this reels 2 First and second reel brakes 3 and 4 to be disengaged
In a tape cassette with a one second reel brake 4 of the claw piece 4 ₂ engages and disengages the reel engaging Tomeha 2 _1, and an operation piece 4 _3, the insertion hole 10 of the device-side brake release pin P to face is located in a hollow cylindrical boss portion 4 ₁ fitted rotatably to the guide shaft 41, a spiral groove 40 provided on the inner peripheral surface of the boss portion 4 ₁ of the reel brake 4, the spiral the convex portion 42 ₁ that fits into the groove 40, concave support shaft fit interpolating 42
The slider 42 is fitted to the vertically movable boss portion 4 ₁ and a _2, and provided with a spring 43 for biasing the slider 42 downward, the operating piece 4 ₃ of the second reel brake 4 the operating piece 3 ₃ being connected, the first reel brake 3 and a claw piece 3 ₂ engages and disengages the other reel engaging Tomeha 2 _1, rotatably pivoted on a support shaft 3 ₁ provided in the case And
And, a spring 5 for biasing the pawl piece 3 ₂ the locking direction of the locking tooth 2 ₁ Te Bei is obtained by the brake mechanism.

In this case, the guide shaft 41 is
Is erected on the lower case of the hollow cylindrical boss portion 4 provided in an eccentric position in contact with the _first inner surface, the brake release pin P abuts the top surface of the plate-like slider 42 a concave 42 ₂
In mated, but it is preferable to fit so as to slide vertically in the boss portion 4 _1, be a double structure of an inner cylinder fitted in the boss portion to be outer cylinder as necessary it can. Further, the examples of the first reel brake 3 has a spring 5 that is wound on the support shaft 3 ₁ and Kakari支the engaging support piece 30 provided at one end of the spring claw piece 3 _2, spring 5 The other end of the second reel brake 4 is biased to the brake position by engaging with the case fixing wall 31, but may be replaced by another spring that is engaged by the second reel brake 4 side. Further, the hollow cylindrical boss portion 4 _1, its upper and lower surfaces have an opening end, claw piece 4 ₂ and operating piece 4 on the outer circumference
₃ and be one obtained by projecting a pivotably journaled on the guide shaft 41 via the slider 42 fitted, the second reel brake 4 against upward movement of the brake release pin P
Does not move but gives only rotational movement.

[0008] As the slider 42, in the second reel brake 4 of the boss portion 4 _1, a brake release pin P from the apparatus has a lower surface portion in contact with a top portion comprising a spring receiving good to use things, but to the as between casing 1 the cylindrical boss top portion by fitting the coil spring 43 is biased in a brake release pin insertion hole 10 side, and closes the upper surface of the boss portion 4 ₁ The spring 43 may be enclosed by the slider 42 to provide a simple assembly type. The brake release pin P is inserted into the insertion hole 1 provided in the case 1.
0, that is, case 1 in the magnetic tape end detection method
It is convenient to use a lighthouse type detector (light emitting device) inserted in the inside, and the second reel brake 4 on one side rotates in accordance with the elevation of the brake release pin P. And the first reel brake 3 on the other side is provided so as to be interlockable. Thus, the slider 42 of the boss portion _{4 1} of the second reel brake 4
Moves vertically on the guide shaft 41 while being guided by the helical groove 40 to apply a rotational movement to the second reel brake 4 on one side and further interlock the first reel brake 3 on the other side. both reels 2,2 is rotatable away pawl ₄ 2, _{3 2} from the reel engaging Tomeha _{2 1.} In the figure, 11
Is formed in the case 1 by a reel hub hole.

[0009]

According to the present invention, the first reel brake, which is engaged with and disengaged from one of the reel engaging teeth, comprises a claw piece and an operating piece rotatably provided on a support shaft provided on a case, and the other. The second reel brake, which engages with and disengages from the reel locking teeth, has a hollow cylindrical boss portion, a claw piece on the outer periphery of the boss portion, and an operation piece that comes into contact with the operating piece, and is further provided. A helical groove is formed on the inner periphery of the boss portion, and a concave notch to be inserted into a guide shaft erected near the brake release pin insertion hole formed in the case in the boss portion, and the helical groove is fitted into the helical groove. By providing a slider having a convex portion that fits in a vertically movable manner, a spring that urges the slider downward, and a spring that urges the claw of each reel brake in a brake locked state, Even if it operates according to the movement of the release pin, the reel brake on one side rotates. The brake can be engaged and disengaged by interlocking the other side of the reel brake, and it can function sufficiently even in a narrow area.In addition, the release lever component is not required, and the reel brake mechanism can be downsized and narrow. The brake mechanism can be deployed in the area, and the braking action can be made accurate and stable. In addition, the shape of the spiral groove allows the release brake to follow the device side to operate even if the release brake moves greatly. It is possible to switch from the state to the stationary state, and it is possible to exhibit an accurate braking function that is satisfactory as a required brake mechanism, and it is also possible to construct the brake mechanism as an assembly in advance, even in a narrow area of the case Insertion and assembly work becomes easy, and productivity can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a lower case in a use state according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a separated state of a brake mechanism.

FIG. 3 is a perspective view of an assembled state of a brake mechanism of a second reel brake.

FIG. 4 is an enlarged plan view of a part of a lock operation state of the reel brake.

FIG. 5 is an enlarged plan view of a part of the reel brake unlocking operation state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 2 Reel 2 ₁ Locking tooth 3 1st reel brake 3 ₁ spindle 3 ₂ claw piece 3 ₃ operation piece 4 2nd reel brake 4 ₁ boss part 4 ₂ claw piece 4 ₃ operation piece 5 spring 10 Brake release pin insertion Hole 40 Spiral groove 41 Guide shaft 42 Slider 42 ₁ Convex part 42 ₂ Concave notch 43 Spring P Brake release pin

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Motohiko Shima 1-1-13 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) References Reference Field (Int.Cl. ⁶ , DB name) G11B 23/087 506

Claims (4)

(57) [Claims] 1. A tape cassette provided with a pair of tape reels for winding a tape in a case, and provided with a first reel brake and a second reel brake which are engaged and disengaged with locking teeth formed on each of the tape reels. The first reel brake, which engages with and disengages from one of the reel engaging teeth, comprises a claw piece and an operating piece rotatably provided on a spindle provided on the case, and engages and disengages with the other reel engaging tooth. The second reel brake has a hollow cylindrical boss portion, a claw piece on the outer periphery of the boss portion, and an operation piece abutting on the operating piece, and further has a spiral shape on the inner periphery of the boss portion. In addition to forming a groove, the boss includes a concave notch that is inserted into a guide shaft that stands upright in the vicinity of a brake release pin insertion hole formed in a case, and a protrusion that fits into the spiral groove. A slider is provided to be able to move up and down, and the slider is Tape cassette, characterized the spring biasing, that the pawl of the reel brake and a spring for urging the brake locking state. 2. The tape according to claim 1, wherein the slider is made of a plate-shaped material that contacts the top surface of the brake release pin, and is fitted to a guide shaft in a boss portion so as to slide vertically. cassette. 3. The first reel brake has a coil spring wound around a support shaft thereof, one end of the spring is supported by a support piece provided on a claw, and the other end of the spring is fixed to a case. 3. The tape cassette according to claim 1, wherein the tape cassette is supported by a wall. 4. A hollow cylindrical boss portion of the second reel brake has upper and lower end surfaces formed as open ends, and is rotatably supported by the guide support shaft via a slider fitted in the boss portion. 4. The tape cassette according to claim 1, wherein the tape cassette is formed.