JPH054144Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tape cassette (hereinafter referred to as "cassette") having a reel brake for video, audio, etc.

(Prior art) Conventionally, video cassettes have a lid on the front of the cassette to protect the tape, and when not in use, the lid remains closed by the force of a spring. Then there is something that will open the lid. Even something like this
A portion of the bottom of the cassette case is always open in preparation for tape loading, and remains open even when not in use. In addition, such a cassette naturally has a reel brake, and when it is not in use, such as during transportation, it can be stopped by a stopper.
Prevents tape from sagging due to idle spinning of the reel.
It is equipped with a mechanism to release the brake when in use.

(Problems with the prior art) If such a conventional tape cassette mechanism is applied as it is to a digital tape cassette, etc., the tape is used in a structure where only one side is used and the digital recording method is used, so dust, especially the finger Errors occur due to fingerprints or oil deposits caused by direct contact of fingers or the like with the tape surface. Therefore, a structure is required to deal with errors. To this end, a slider is installed on the bottom of the cassette, and when not in use, the tape is protected by covering the opening for tape loading (hereinafter referred to as the "loading opening"), and when in use, a reel brake and a separate slider are installed. It is thought that it can be opened by operating it, or by operating a slider that is integrated with the reel brake. However, with the former method in which the reel brake and slider are separated, the reel brake and slider must be operated separately when in use and when not in use, making the cassette mechanism that much more complicated. becomes. In addition, in the latter case where the reel brake and slider are integrated, the moving distance of the slider and the moving distance of the reel brake match, so when you operate the slider and open the loading opening during use, The reel brake also moves backwards, requiring a large space within the cassette in preparation for the backward movement. Therefore, the cassette case also becomes larger by the space required, which poses a problem in reducing the size of the cassette.
Furthermore, if the brake is removed from the reel at the same time as the slider starts moving, the tape tends to loosen before loading begins, and there is a risk that the tape may be damaged by the tape pulling member on the deck side. Also, even when the rotating opening is closed, if the brake is not applied to the reel immediately after the slider starts moving,
After all, the tape tends to loosen, and there is a risk of damaging the tape when starting the next loading process.

(Purpose of the invention) The present invention was made to solve these conventional problems, and by associating the movement of the slider with the movement of the reel brake and making the moving distances of the two different. The present invention aims to reduce the size of the cassette case and provide a tape cassette that does not damage the tape at the start of loading.

(Summary of the invention) The tape cassette of the invention is equipped with a reel brake and a separate slider for opening and closing the loading opening provided in the case. A guide protrusion is provided between the slider and the reel brake as an interlocking delay mechanism to regulate the direction of movement of both to match the direction of the bias, and a guide protrusion is provided between the slider and the reel brake to always apply the force in the same direction. By interposing the space, the moving distance of the reel brake is made smaller than the moving distance of the slider moving in the same direction, and the reel brake is linked accurately. The feature is that when the brake is removed and the slider starts moving when the loading opening is closed, the brake is immediately applied to the reel.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

Figure 1 shows the present invention as a digital audio system.
FIG. 2 is a diagram showing one embodiment of the present invention applied to a tape cassette, showing a schematic plan view of the state when not in use. FIG. 2 is a sectional view taken along the line C-C'. For convenience of explanation, FIG. 1 is a view with the upper case removed, leaving only a portion, and FIG. 2 is a view with some mechanical parts inside the cassette case omitted. In the figure, 1
0 is an upper case, and 12 is a lower case, both of which are made by plastic molding or the like, and together constitute a cassette case.

14 is a supply side reel, and its reel hub 1
A magnetic tape 18 using a digital recording method is wound around the tape 6 . 22 is a take-up reel, and the tape 18 sent out from the supply reel 14 is sequentially wound around the reel hub 24. In addition,
25 is a take-up reel 2 on which the tape 18 is wound.
This is a circle indicating the outermost diameter of the tape No. 2. Also, 19,
21 are tape guides.

Reference numeral 26 denotes a lid, which is, for example, an elongated plate having a substantially L-shaped cross section and having both side walls. The lid 26 is a front lid that protects the tape 18, and its side walls 2
At 8 and 30, it is rotatably supported on the case. When not in use, a spring (not shown) is used to cover the front of the cassette with a lid 26, and it remains locked, but when the cassette is set, a lever (not shown) releases the lock and the lid opens. .

32 is a slider, for example, a flat plate body. A concave fitting portion 34 protrudes from the rear central portion of the substantially rectangular body, and the entire body is left-right symmetrical. The slider 32 has a fitting portion 34
It works in conjunction with the reel brake, which will be described later. Near the center of the flat plate is a cylindrical projection 3 for fixing the spring.
3 protrudes, and a slider spring 3 is placed around it.
The center part of 6 is rolled up. Slider spring 36
Both ends of the slider 32 are held by spring-holding cylindrical projections 38 and 40 that protrude from the lower case 12, so that the slider 32 is constantly given tension directed toward the front. Therefore, when the slider 32 is not in use, the loading opening 42 shown by the dotted line is kept closed. 4
4 and 46 are parallel protrusions respectively protruding from the lower case 12, which sandwich both sides of the slider 32,
It controls and guides the slider in the direction of arrow X.

48 is a reel brake, for example, a flat plate body. There are stoppers 50, 52 at both ends of the elongated substantially rectangular body, and the tip teeth 54, 5
6 can be fitted with gears 58 and 60 provided on both reel hubs 16 and 24, respectively.
Further, a convex fitting portion 62 protrudes from the front central portion of the elongated substantially rectangular body, so that the entire reel brake 48 has a left-right symmetrical shape. 64 is a reel brake spring, the center part of which is wound around a cylindrical projection (not shown) protruding from the lower case 12. Both ends of the reel brake spring 64 are
The reel brakes 48 are held by cylindrical projections 66 and 68 which respectively protrude from symmetrical positions, and the reel brakes 48 are constantly given tension directed toward the front. Therefore, the reel brake 48 meshes with both reel hubs 16 and 24 when not in use, and prevents both reels 14 and 22 from spinning idly.

70 and 72 are parallel protrusions respectively protruding from the lower case 12. Those parallel protrusions 70, 72
clamps both sides of the concave fitting portion 34 of the slider and the convex fitting portion 62 of the reel brake to restrict sliding of both in the direction of arrow X,
It provides guidance and constitutes an interlocking mechanism.
Both fitting parts 3 sandwiched between parallel protrusions 70 and 72
A certain space 74 exists between 4 and 62. Due to the existence of this space 74, the slider 32 and the reel brake 48 are separated from each other when not in use.

Reference numeral 76 denotes a slider release pin, which is used to slide the slider 32 by pushing a small notch (not shown) provided in the slider 32 in the direction of arrow Y when setting the slider.

Note that the reel hubs 16, 24, lid 26, slider 42, reel brake 48, etc. are made, for example, by plastic molding.

The operation of this embodiment will be explained below.

FIG. 3 and FIG. 4 are schematic diagrams showing the state in use of this embodiment, respectively, and FIG. 3 is the same as FIG. 1.
FIG. 4 corresponds to FIG. 2, and corresponding parts are given the same reference numerals.

First, a cassette in an unused state as shown in FIG. 1 is set on a deck (not shown) or the like. That is, the lid 26, which covers and protects the tape 18 located at the front of the cassette, is unlocked and rotated 90 degrees by the force of the spring, exposing the tape. Further, the slider 32, which covers the loading opening 42 located at the bottom of the cassette to protect the tape 18, is pushed in the direction of the arrow Y by the slider release 76, and is pushed backward in the direction of the arrow
It moves to a predetermined position against the slider spring 36, etc., and exposes a space for insertion of a tape loading pin such as a deck. At this time, the concave fitting portion 34 of the slider and the convex fitting portion 62 of the reel brake fit and abut, and the slider 32 and reel brake 48 move backward,
The meshing is released, the restraint on both reels 14 and 22 is released, and the tape can be used. but,
For this purpose, the moving distance B of the reel brake 48 is small compared to the moving distance A of the slider 32 necessary for this purpose, and a certain time delay is caused in the movement.
That is, a certain space 74 is interposed between the slider 32 and the reel brake 48, and together with the guide protrusions 70, 72, etc. arranged in parallel, they constitute an interlocking delay mechanism, so the movement of the reel brake 48 is interlocked with the slider 32. However, the amount of movement thereof is different, and it becomes possible to release the reel brake 48 near the final movement of the slider 32 and loosen the tape. Therefore, the reel brake 48 is the slider 3
Since the rotation of both reels 14 and 22 is prevented until near the final movement of the tape 18, the tape 18 is prevented from becoming slack, so damage to the tape 18 caused by slack at the start of loading can be prevented. Furthermore, when the loading opening 42 is closed, when the slider 32 starts moving, the reel brake 48 immediately follows and is interlocked, so the brake is applied immediately and the rotation of both reels 14 and 22 is prevented, so the tape 18 can be prevented from loosening.

In this embodiment, a digital audio tape cassette has been described, but the present invention can of course also be applied to a digital video tape cassette.

(Effects of the invention) According to the invention described above, even if the slider and reel brake are separated by a space when the cassette is not in use, the guide protrusion restricts the distance between the slider and the reel brake when the cassette is in use, and the loading When the opening for loading is opened, the reel brake can be delayed and accurately interlocked, and when the opening for loading is closed, the reel brake can be immediately followed and accurately interlocked. Therefore, the moving distance of the reel brake can be smaller than the moving distance of the slider moving in the same direction, making it easier to downsize the cassette.
What's more, when the loading opening is opened, the reel brake prevents the reel from rotating until near the end of the slider's movement when it comes into contact with the reel brake, and when the loading opening is closed, as soon as the slider starts moving, the reel brake is interlocked and immediately Since rotation of the reel is prevented when the reel brake is applied, loosening of the tape can be prevented. Therefore, damage to the tape caused by slack at the start of loading can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention when the cassette is not in use. Figure 2 shows
It is a CC' sectional view thereof. FIG. 3 is a schematic plan view showing an embodiment of the cassette of the present invention in use, and corresponds to FIG. 1. Figure 4 shows the C
-C' sectional view, corresponding to FIG. 2. 10... Upper case, 12... Lower case, 14...
...Supply side reel, 16...Supply side reel hub, 1
8...Tape, 22...Take-up reel, 24...
Take-up side reel hub, 26...Lid, 32...Slider, 36...Slider spring, 42...Loading opening, 48...Reel brake, 6
4... Reel brake spring, 70, 72... Guide projection, 74... Space.

Claims (1)

[Scope of utility model registration request] A tape cassette with a reel brake is equipped with a slider that opens and closes the loading opening provided in the case, and the slider and reel brake are always biased in the same direction by springs to close the loading opening and brake the reel. However, a guide protrusion is provided between the slider and the reel brake as an interlocking delay mechanism to regulate the direction of movement of both to match the biasing direction,
A tape cassette characterized in that a space is provided between the two when the cassette is not in use.