JPH0230111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette for a video tape recorder, and more particularly to a brake mechanism thereof.

Conventional Structure and Problems Conventionally, in this type of tape cassette, a brake mechanism has been used to prevent the rotation of the reel on which the magnetic tape is wound, in order to prevent the magnetic tape from loosening during transportation. A structure as shown in FIG. 1 was used. In Fig. 1, 1 is a reel on the supply side that winds the magnetic tape, and 2 is a reel on the take-up side that winds the magnetic tape wound on the supply reel 1. A plurality of locking grooves 1a and 2a are provided.

3 and 4 are the locking grooves 1a and 2a of the reels 1 and 2.
These brakes 3 and 4 are rotatable around their shafts, and are engaged with the locking grooves 1a and 2a of the reels 1 and 2 by brake springs 5 and 6. It is constantly biased in the direction of stopping. Reference numeral 7 denotes a brake release lever that the rear ends of the brakes 3 and 4 come into contact with. By operating this brake release lever 7 from the outside, the brakes 3 and 4 rotate around their shafts, and the reels 1 and 2 are engaged. The locking to the stop grooves 1a and 2a is released.

By the way, in the case of this conventional tape cassette,
As is clear from Figure 1, there were many parts that made up the brake mechanism, and each part had to be individually attached to the mounting shaft provided in the case, making it difficult to assemble. .

OBJECTS OF THE INVENTION The present invention solves these conventional drawbacks, and aims to provide a tape cassette equipped with a brake mechanism that is easy to assemble with a small number of parts and can operate smoothly. be.

Structure of the Invention In order to achieve this object, the present invention uses a brake in which a supply side brake piece and a take-up side brake piece are integrally molded via a hinge part on a brake release part main body that can be operated from the outside. is guided by a U-shaped guide wall provided in the case and a guide rib provided on the inner surface of the case surrounded by the guide wall, and the biasing force of the brake spring is applied to the brake piece that comes into contact with the guide protrusion protruding into the case. The brake mechanism is made up of only brake pieces and brake springs, reducing the number of parts, making it easier to assemble, and operating smoothly.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3, which show an embodiment of the present invention. Note that in FIGS. 2 and 3, the same parts as in FIG. 1 are given the same numbers.

In the figure, 8 is a brake made of synthetic resin such as polypropylene, and this brake 8 is a third brake.
As shown in the figure, brake pieces 8d and 8e on the supply side and take-up side are integrally molded at the tips of both wings of a T-shaped brake release body 8a via hinge parts 8b and 8c. The brake pieces 8d and 8e are rotatable around the hinge parts 8b and 8c. Further, the hinge portions 8b and 8c are constructed by providing V-shaped grooves. Furthermore, this brake 8 is provided with a guide groove 8f into which a guide rib 10 provided on the half case 9 fits. The half case 9 also includes a brake release part body 8 of the brake 8.
A U-shaped guide wall 11 is provided to surround the area a. 12 is the brake piece 8 of the brake 8
d, 8e in the direction of the locking grooves 1a, 2a of the reels 1, 2, and is installed on posts 13c, 13d planted in the half case 9, and has brake pieces 8d, 8e at both ends, respectively. It is hooked on the locking part 8e. Guide protrusions 13a and 13b are implanted in the half case 9, and are brought into contact with the brake pieces 8d and 8e of the brake 8.

In the brake mechanism having this structure, by pushing the brake release part main body 8a of the brake 8 with a pin through a through hole provided in the bottom surface of the half case 9, the brake release part main body 8a moves in the direction of the arrow in FIG. . With this, the brake piece 8
d and 8e come into contact with the guide protrusions 13a and 13b and are bent by the hinge parts 8b and 8c, so that a force is applied to rotate them in a direction away from the reels 1 and 2 against the biasing force of the spring 13, and the brake pieces 8
d, 8e and the locking grooves 1a, 2a of the reels 1, 2 are released.

Effects of the Invention As described above, according to the tape cassette of the present invention, since a brake is used in which the supply side brake piece and the take-up side brake piece are integrally molded on the brake release part main body via the hinge part, the number of parts is reduced. is 2 including one brake spring.
This has the effect of simplifying the assembly work.

In addition, the brake is configured so that the main body of the brake release part that is freely slidable inside the half case is guided by a U-shaped guide wall provided in the half case and a guide rib provided on the inner surface of the case surrounded by the guide wall, and Since the brake piece on the supply side and the brake piece on the take-up side, which are integrally formed through the part, come into contact with a guide protrusion provided in the case to obtain rotational force for releasing the brake, the brake is attached to the main body of the brake release part. can be supported between a pair of half cases, allowing smooth sliding movement. Therefore, the operation of blocking the reel rotation by the brake and releasing the rotation blocking is smooth, and a brake mechanism that operates reliably and smoothly can be constructed.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the main structure of a conventional tape cassette, Fig. 2 is a perspective view showing the main structure of a tape cassette according to an embodiment of the present invention, and Fig. 3 is a main part of the tape cassette. FIG. 1, 2... Reel, 1a, 1b... Locking groove, 8
... Brake, 8a ... Brake release unit body, 8
b, 8c...hinge portion, 8d, 8e...brake piece.

Claims (1)

[Claims] 1 A case surrounded by a U-shaped guide wall provided in a portion corresponding to the space where the pair of reels approach each other in a half case that accommodates reels on the supply side and take-up side that wind magnetic tape, and the guide wall. A brake release part body that is slidably supported by guide ribs provided on the inner surface and can be operated from the outside, and a brake release part body that is integrally molded with the brake release part body via a hinge part and provided in the upper air half case. a brake having a supply side brake piece and a take-up side brake piece that come into contact with a guide projection piece; and a brake that is installed on a post provided in the half case, and that is connected to the pair of reels with respect to both the brake pieces. a brake spring whose both ends are hooked to both of the brake pieces so as to apply a spring biasing force in the direction of engagement with the locking groove provided in each of the brake pieces, and when the brake is not in use, the brake The brake pieces are moved to the operating position by a spring biasing force applied to the brake pieces, and each of the brake pieces is engaged with a locking groove provided in each of the pair of reels to prevent rotation of the pair of reels. A tape cassette characterized in that it is configured as follows.