JPS60247876A - Tape cassette - Google Patents

Abstract

PURPOSE:To smoothly perform brake releasing and restoring operations without any hindrance, by providing a guiding rib equipped with a stepped section formed by a linear or arcuate gradient in its upper half case. CONSTITUTION:When the inclined surface 9c of the main body of the brake releasing section of a brake piece 9 is pushed by means of an external brake releasing pin 8 through a through hole 3a provided in the bottom of a lower half case 3, the main body 9a of the brake releasing section moves in the brake releasing direction along a guiding rib 7a provided in an upper half case 7 and another guiding rib 3f provided in the lower half case 3. In the course of the movement, the main body 9a is inclined along the gradient of the stepped 7b since the guiding rib 7 is equipped with the stepped section 7b and around the contacting section between the stopper rib 3g of the lower half case 3 and the main body 9a in the vicinity of the root of the stopper rib 3g. Therefore, force which rotates brakes 10a and 10b in the direction being separated from reels 1 and 2 is applied to the brakes 10a and 10b through hinge sections 10c and 10d and the engagement between the brakes 10a and 10b and the engaging grooves 1a and 2a of the reels 1 and 2 is released.

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 Traditionally, 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, reference numeral 1 is an IJ on the supply side that winds up the magnetic tape, and Nope 2 is a take-up reel on which the magnetic tape wound on the supply reel 1 is wound. There are multiple locking grooves 1a on the outer periphery.
.

2a is provided.

sa, 5b are the locking grooves 1a of the reels 1 and 2,
This brake sa, sb is a brake that can be engaged and detached from 2a.
is rotatable around the axis, and the brake spring ea
, 6b, the locking grooves 1a, 2a of the above-mentioned 1, 2
It is constantly biased in the direction of locking. Reference numeral 4 denotes a brake release lever that the rear ends of the brakes 5a and esb come into contact with. By operating this brake release lever 4 with an external brake release bin 8, the brakes sa and 5b are rotated around the shaft. The locking grooves 1a of the reels 1 and 2 are moved.

The lock to 2a will be released.

3 is a lower half case containing a built-in brake mechanism.

By the way, in the case of this conventional tape cassette, as is clear from the above-mentioned configuration description and FIG. There are many parts,
The structure becomes complicated.

Also, when the tape cassette is shaken, an abnormal noise is generated due to the collision between the components of the brake mechanism, and the person holding the tape cassette wonders if it is broken. The drawback was that it gave a sense of unease. Furthermore, as shown in FIG. 2, at the stage of performing a brake release operation from the outside, the brake release pin 8 provided on the video tape recorder and the brake release pin insertion hole 3a provided in the lower half case of the tape cassette are Brake release pin 8 whose positional relationship is shown by the two-dot chain line
When the positional relationship is as shown in ', the parts indicated by broken hatching overlap, and the tape cassette is not properly aligned with the video recorder, resulting in a floating state.

Further, a tape cassette having a brake mechanism as shown in FIGS. 3 to 8 has also been devised. In FIGS. 3 to 7, the same components as in FIGS. 1 and 2 are given the same numbers. Reference numeral 9 denotes a brake piece made of synthetic resin such as polypropylene. As shown in FIG. It is constructed by integrally molding the brakes 10a and 10b on the side and take-up sides.
b is rotatable around hinge parts 10c and 10d.

Further, the hinge portions 10c and 10d are constructed by providing a V-shaped groove. Furthermore, this brake piece 9 has
A guide groove 9d into which the guide rib 3f provided on the lower half case 3 fits is provided. Further, the lower half case 3 is provided with a guide wall 3h so as to surround the brake release portion side surface 9b of the brake piece 9. 3q is a stopper rib provided on the lower half case 3 to limit and stop the movement stroke of the brake release portion main body 9a. 11 is the brake 9a of the brake piece 9, 9
This is a brake spring for constantly urging the reels 1 and 2 in the direction of the locking grooves 1a and 2a of the reels 1 and 2. 3b and 3C are guide ribs, and 3d.

Denoted at 3e are brake spring supporting poles, which are respectively installed in the lower half case 3.

In the brake mechanism of this structure, a through hole 3a for inserting the brake release pin 8 provided on the bottom surface of the lower nose case 3 is used.
By pushing the inclined surface 9C of the brake release part main body of the brake piece 9 with the brake release pin 8 through the brake release pin 8, the brake release part main body 9a is moved along the guide rib 7a of the upper half case 7 shown in FIG. Move in the direction of arrow 12.

This allows the brakes 9a, 9b to have hinge portions 9C, 9
d, a force is applied to rotate the reels 1, 2 away from the reels 1, 2, and the brakes 9a, 9b are disengaged from the locking grooves 1a, 2a of the reels 1°2.

However, in the case of a tape cassette having this brake mechanism, as shown in FIGS. 6 to 8, the operating stroke of the brake piece 4 when the brake is released is large, and the implanted guide rib shown in FIG. 3b, 3C and the brakes 9a, 9b, due to the frictional resistance at the contact surfaces indicated by arrows 13 and 13, there was a drawback that the return movement of the brake piece 9 in the brake engagement direction was not smooth.

OBJECTS OF THE INVENTION The present invention solves these conventional drawbacks, and provides a tape cassette having a brake mechanism that has a simplified brake mechanism configuration with a small number of parts and allows brake release and return operations to be performed smoothly without any hindrance. This is what we provide.

Structure of the Invention In order to achieve this object, the tape cassette of the present invention has the following features:
Using a brake piece that can be operated to release the brake from the outside, the top case is provided with a linear or arc-shaped guide for guiding the brake piece when the brake piece is moved after being released by a brake release pin. A guide rib having a stepped portion formed by a slope is provided, and a stopper rib having a slope is provided at a portion of the lower case where the brake piece moves and comes into contact.

With this configuration, the brake piece moves linearly to the vicinity of a stopper lip for stopping the movement of the brake piece provided on the lower half case, and then tilts at the slope of the stepped portion and releases the brake. Therefore, the movement stroke of the brake piece becomes smaller. This means that the brake release operation and return operation can be performed smoothly, and no matter where the brake release pin is located in the through hole, the brake release pin can be inserted without any problem, and the brake release operation can also be performed without any problem. That will happen.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. 9 to 12. Note that in FIGS. 9 to 12, the same parts as in FIGS. 1 to 8 are given the same numbers.

1.2 is the reel, 1a and 2a are the locking grooves, 3 is the lower half case, 3a is the through hole, 3b and 3G are the guide ribs, sd,
3e is a brake spring support pole, 3f is a guide rib, 3q is a stopper rib, 3h is a guide wall, 9 is a brake piece, 9a is a brake release body, 9b is a side surface of a brake release body, 9C is a brake release body Slope, 10a
, 10b is the brake, 10c, 1od is the hinge part, 9
d is a guide groove, and 11 is a brake spring. Also, 7
1 is an upper half case, 7a is a brake guide rib, and 8 is a brake release pin provided on a video tape recorder (not shown). The above configuration is the same as the configuration shown in FIGS. 3 to 6.

FIGS. 9 to 11 are diagrams showing the moving states of the brake pieces of the tape cassette of the present invention. FIG. 12 is an exploded perspective view of the main components.

7b is a guide rib 7a provided on the upper half case 7.
It is a stepped part formed with a slope of a straight line shape and an arc shape, and the stopper rib 3q of the brake release/release part main body 4a.
has a slope that approximates the inclination angle of the brake release portion main body 9a.

The operation of the brake mechanism of the tape cassette constructed as described above will be explained.

As shown in Figures 9 to 11, first, lower half case 3
By pushing the inclined surface 9C of the brake release part body of the brake piece 9 with the external brake release pin 8 through the through hole 3a provided in the bottom surface of the brake release part body 9a, the brake release part body 9a is released into the upper half as shown in FIG. It moves in the brake release direction along the guide rib 7a provided on the case 7 and along the lower half case 3-ρ guide rib 3f. Since the guide rib 7a has a stepped portion 7b in the middle, the guide rib 7a has a stepped portion 7b, and the contact portion with the brake release portion body 9a near the root of the stopper rib 3q of the lower half case 3 is moved along the slope of the stepped portion 7b. It will lean towards the fulcrum. As a result, a force is applied to the brakes 10a, 10b via the hinge portion 10C71od to rotate the brakes 10a, 10b in a direction away from the reels 1, 2.

1ob and the locking grooves 1a and 2a of the reels 1 and 2 are released.

Effects of the Invention As described above, according to the tape cassette of the present invention, by providing the upper half case with a guide rib having a stepped portion formed with a linear or arcuate slope, the lower half case
・-The brake release part body that comes into contact with the base of the stopper IJ provided on the brake case will be tilted along the step slope due to the force of insertion of the brake release pin, and the backward movement stroke due to the insertion of the brake release pin will be prevented. The brakes on both wings of the brake release body can be reduced to about half of the conventional size, but the brakes on both wings of the brake release body can be used even if the brake release pin is positioned within the hole such that the brake release body is moved to the rearmost position. Even when the shape is a large hemisphere, the brake release part body is tilted toward the upper half case, so that the brake can be released smoothly. Furthermore, since one end of the brake is located away from the guide rib, the frictional resistance is also reduced, and the return of the brake release portion main body to the brake engagement direction can be performed smoothly.

Furthermore, as mentioned above, the brake release pin should originally be located at the center of the through hole, but even if the brake release pin is located in a position where the movement of the brake release part body is large, the brake release pin can be inserted without any problem, and As shown in FIGS. 10 and 11, even in a positional relationship where the movement of the brake release part body is small, the brake can be completely released, and the practical effects of this are significant.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main structure of a first conventional tape cassette, and FIG. 2 shows a state in which the main components of the tape cassette are engaged with a brake release pin provided on a video tape recorder. 3 is a perspective view showing the main structure of the second conventional tape cassette, FIG. 4 is a perspective view showing the main parts of the same tape cassette, and FIG. 5 is a main part of the same tape cassette. FIG. 6, FIG. 7, and FIG. 8 are cross-sectional views, plan views, and cross-sectional views showing the operating states of the main components of the tape cassette, respectively, and FIG. 9 is an exploded perspective view of the main components of the tape cassette. FIGS. 10 and 11 are cross-sectional views showing operating states of the main parts of a tape cassette according to an embodiment, respectively, in which the main parts of the tape cassette are engaged with a brake release pin provided on a video tape recorder. FIG. 12 is an exploded perspective view of the main parts of the tape cassette. 1.2 ・Reel, 1a, 2a...Latching groove,
3.-Lower half case, 3q...Stotube lift,
4 Brake piece, 7 ... Upper half case, 7a.
...Guide rib, 7b...step, 9...brake piece. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure? Figure 2 Figure 3 Illustration 4 Figure/ρd =;4'J 9 Figure 7b ゝI i 1 o Figure Jin 5 J! ? 1 Figure 12 7α

Claims (1)

[Claims] It has a supply side reel and a take-up side reel wound with magnetic tape, and a brake mechanism that prevents rotation of the reel when not in use, and the brake mechanism uses a brake piece that can be operated to release the brake from the outside, The upper half case is provided with a guide rib having a step formed by a linear or arcuate slope for guiding the brake piece when the brake piece is moved by a brake release pin. 1. A tape cassette comprising: a stopper rib having a slope at a portion of the lower flap case where the brake piece moves and comes into contact with the stopper rib.