JP3299479B2 - Tape cassette - 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 cassette such as a video tape cassette for winding a magnetic tape around a reel for magnetically recording and reproducing an electric signal.
The present invention relates to a tape cassette having a reel brake mechanism.

[0002]

2. Description of the Related Art In a tape cassette having a pair of reels wound with a magnetic tape, when a magnetic tape is not used (during storage), a pair of brake members are brought into contact with the reels so that the tape does not sag. Control its rotation,
In use, it is common to release the brake member to allow the reel to rotate. In Japanese Utility Model Application Laid-Open No. 4-67267, one end of a pair of pivotally mounted brake members is provided on the saw-toothed peripheral surface of the reel so that the pair of brake members and their related mechanisms occupy only a small space in the main body case of the cassette. Then, the brake release member is moved upward between the upper and lower cases by the release pin on the cassette recorder side, and the upward movement is transmitted to the other end of the brake member via the cam surface to release the brake. It has been proposed. In this case, a vertical guide member for the brake release member is formed in the lower case. As shown in FIGS. 8 and 9, the lower case 40 has a guide groove for the release member between the guide wall 41 also serving as the front wall and the guide ribs 43, 43 immediately inside the guide wall 41, as well as the inside. Guide members 45, 4
5 are formed. The guide member that guides the brake release member (see 8 in FIG. 1) in the upper case is formed by extending the guide wall 41 of the lower case to the upper case 42 in this manner. Is formed with a notch 47.

[0003]

A guide wall 41 is provided on the lower case.
Is formed, the corresponding portion of the upper case becomes the notch 4
7, the cutout 47 is located at the center of the upper case 42, so that the upper case has a weak structure. Further, since the inner wall of the upper case is constantly stressed by a spring member (see 9 in FIG. 1) for urging the brake release member downward, the center of the upper case expands when used at a high temperature. As a result, the reliability was reduced.

[0004]

According to the present invention, a pair of tape reels is rotatably provided in a main body case composed of upper and lower cases, and a reel brake member and a brake release member are provided between the pair of tape reels on the front surface of the case. Is provided, and when the cassette is not used, the reel brake member is biased by a spring member in a direction in which the reel brake member engages with a tooth portion provided on the outer periphery of the reel,
The release member is pressed downward by a coil spring, and when the cassette is used, the release member moves upward against a spring force by a brake release pin, and in conjunction with this, the brake member rotates and the In a tape cassette having a brake mechanism configured so that engagement with a flange tooth portion of a tape reel is released and rotation of the tape reel is enabled, a guide wall for guiding up and down movement of the release member is formed integrally with the lower case. are, the lower portion of the guide wall thickness
The upper part as a meat part is opposite to the side guiding the release member.
It is formed as a thin wall by stealing the other side and
Both corners of the upper end of the meat part are formed in a chamfered shape,
The side wall of the upper case is almost complementary to the thin wall of the lower case.
In the part overlapped with the shape,
Is also characterized by forming a thin side wall.

[0005] In the tape cassette of this construction, since the wall for guiding the release member is formed of one case as in the conventional case, the release operation is good, and the upper part of the guide wall of the release member is an overlapping structure of upper and lower cases. As a result, the upper case is not cut out so large (deep) that the strength and heat resistance of the upper case can be maintained. Since the guide wall of the lower case and the corresponding upper case portion are chamfered, the strength can be further increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention including the embodiment shown in the drawings will be described in detail. 1 to 7 show a cassette case having upper and lower case front walls and a brake member according to an embodiment of the present invention. Parts that are not related to the main parts are not particularly described except for FIG.

[0007]

FIG. 1 shows the overall structure of a tape cassette according to the present invention. As shown in the drawing, a tape cassette is housed in a pair of rotatable reels 4
And a reel brake 61 for regulating the rotation of the reel 4 at the center of the front of the case.
62 is engaged with the teeth provided on the outer periphery of the reel 4 by the spring member 7 to prevent the reel 4 from rotating. The reel brakes 61 and 62 are configured to rotate in conjunction with the vertical movement of the release member 8. Reference numeral 3 denotes a front cover having a back cover.

FIG. 2 shows the lower case 20 and the reel brake 6
FIGS. 1 and 62 are enlarged views showing a reel brake mechanism including a release member 8, wherein the release member 8 is constantly pressed downward by a coil spring 9 abutting on the upper case, thereby resisting the spring member 7. The reel brakes 61 and 62 are locked to the reel teeth. A guide wall 21 of the present invention for guiding the release member 8 is formed on a front wall of the lower case 20. FIG. 3 is an enlarged perspective view of the reel brake mechanism viewed from the inside toward the front, and shows a guide wall 21 of the present invention extending into the upper case and a reinforcing convex portion 22 thereof. Guided portions 30, 30 and a brake pressing portion 31 are formed on the release member 8, and the guided portions 30, 30,.
30 is a guide groove formed in the guide wall 21 and the lower case 20
Is slid up and down.

FIG. 4 shows the lower case, and FIG. 5 shows the upper case. The lower part of the guide wall 21 of the lower case 20 shown in FIG.
The proposal upper is formed in a portion equivalent to the thick adjacent the side walls
It is formed as a thin wall by stealing the meat on the opposite side from the inside ,
A thin concave side wall 11 is formed at a portion corresponding to the front wall of the upper case 10 shown in FIG. Proposal for lower case 20
The thin wall of the inner wall 21 has a thin concave shape of the upper case 10 during assembly.
It is inserted inside the side wall 11 and overlaps with the concave side wall 11
(See FIG. 6C).

FIG. 6 is a sectional view of the brake unit when the cassette is not used. The release member 8 is pressed downward by the coil spring 9. A guided portion 30 is provided on the front side of the release member 8.
Is provided in the L-shaped groove 23 provided in the guide wall 21 of the lower case 20, and the guided portion 3 on the rear side is provided.
Numeral 0 is vertically sandwiched between the guide ribs 25, 25 of the lower case 20 so that it can move up and down smoothly.

FIG. 7 is a sectional view of the brake unit when mounted on a VTR. The brake release pin A of the device enters the case through the opening on the bottom surface of the lower case 20 and moves the release member 8 upward. A brake pressing portion 31 is provided on the opposite side of the guided portion 30 of the release member 8, whereby the brake members 61 and 62 are rotated to release the engagement with the teeth of the reel 4 and the reel 4 is rotatable. Become. As can be seen from FIGS. 6 and 7, the center of the front surface of the case where the release member 8 is provided is configured such that the guide wall 21 of the lower case 20 and the concave side wall 11 of the upper case 10 overlap. By doing so, the upper case 10 can be moved while the movement of the release member 8 is kept good.
Can be increased in strength. Further, by providing the chamfered portions 12 at both corners of the concave side wall 11 of the upper case 10, the strength can be further increased. The shape of the chamfered portion may not be linear as shown in the figure, but may be R-shaped.

The lower case 20 is provided with a similar chamfer 24 in accordance with this shape. That is, the thickness of the lower case 20
Chamfers are provided at both upper corners of the section. Upper case 10
The height of the concave side wall 11 is preferably 30 to 70% of the peripheral side wall of the upper case 10 (half of the total thickness of the cassette). If it is lower than 30%, the strength of the upper case 10 will not be sufficiently obtained. This is a problem. The guide wall 2 of the lower case 20
Since a gap is formed in the portion sandwiched between the L-shaped walls 23 when the release member 8 is assembled, the portion is formed as a convex portion 22 so that the strength and formability of this portion are minimized. Can be

[0013]

According to the tape cassette of the present invention, since the wall for guiding the release member is formed of one case as in the prior art, the release operation is good, and the upper part of the guide wall of the release member is overlapped by the upper and lower cases. And a lower case
The upper end corners of the thick part and the lower end of the concave side wall of the upper case
Since both corners have a substantially complementary chamfered shape , the upper case will not be cut out large (deep),
The strength and heat resistance of the upper case can be maintained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a tape cassette of the present invention.

FIG. 2 is an exploded perspective view of the lower case and the brake member of the present invention as viewed from the front.

FIG. 3 is a perspective view of the vicinity of a brake member from the inside of the case of FIG. 2;

FIG. 4 shows a lower case of the present invention, wherein (a) is a plan view,
(B) is a front view.

FIG. 5 shows an upper case of the present invention, wherein (a) is a plan view,
(B) is a front view.

6 (a) is a plan view, FIG. 6 (b) is a front view in which a front wall is omitted, and FIG. 6 (c) is a side view in which a part is shown in section. .

FIG. 7 shows a main part of the present invention (when the brake is released);
(A) is a plan view, (b) is a front view omitting a front wall,
(C) is a side view showing a part in cross section.

FIG. 8 shows a conventional lower case, (a) is a plan view,
(B) is a front view.

FIG. 9 shows a conventional upper case, (a) is a plan view,
(B) is a front view.

[Explanation of symbols]

 Reference Signs List 7 spring member 8 release member 9 coil spring 10 upper case 11 concave side wall 12 chamfered portion 20 lower case 21 guide wall 22 convex portion 23 L-shaped groove 24 chamfer 25 guide rib 30 guided portion 31 brake pressing portion 61, 62 reel Brake A release pin

Continuation of the front page (56) References JP-A-6-349230 (JP, A) JP-A-8-7518 (JP, A) JP-A-7-287959 (JP, A) JP-A-1-166386 (JP) , A) Japanese Utility Model Hei 4-67267 (JP, U) Japanese Utility Model Application Showa 60-3976 (JP, U) Tokuhyo Hei 8-511122 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) G11B 23/087

Claims (1)

(57) [Claims] A pair of tape reels are rotatably provided in a main body case composed of upper and lower cases, and a reel brake member and a brake release member are provided between the pair of tape reels on the front surface of the case. The reel brake member is urged by a spring member in a direction in which it engages with the teeth provided on the outer periphery of the reel, and the release member is pressed downward by a coil spring. When the cassette is used, the release member is spring-loaded by a brake release pin. The brake moves upward against the force, and the brake member rotates in conjunction with the force to release the engagement with the flange teeth of the tape reel, thereby enabling the tape reel to rotate. in a tape cassette having a mechanism, the guide walls for guiding the vertical movement of the release member is integrally formed on the lower case, the lower of the guide wall Minute and a thick portion
The upper part is the meat on the side opposite to the side guiding the release member.
Formed as a thin wall by stealing and
Both corners of the end are formed in a chamfered shape, and
The side wall of the switch is almost complementary to the thin wall of the lower case.
Thinner than the other part of the side wall at the overlapped part
A tape cassette characterized by forming a meat side wall .