JPH0341343Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is ideal for application to tape cassettes for video tape recorders, for example, and is arranged on the rear side between a pair of left and right reels. This tape cassette relates to a tape cassette in which a pair of left and right reel lock levers is rotated by sliding a slider backward to unlock both reels.

[Summary of the idea]

In this invention, by sliding a slider placed on the rear side between a pair of left and right reels that are rotatably housed in a cassette case, the rear end surface of this slider can be used to lock the left and right reel lock levers. Both protrusions are pressed to rotate both reel lock levers against the spring, and both claws of both reel lock levers are separated from both teeth formed on the outer periphery of both reels, thereby locking both reels. In a tape cassette that is designed to release the lock and has a cylindrical part with a plug for detecting cassette information located on the rear side of the sliding trajectory of the slider, the cylindrical part may escape when the slider is slid backward. A notch like this is provided on the rear end surface of the slider, and the pressing parts on both the left and right sides of the notch press the protruding pieces of both reel lock levers, thereby ensuring a sufficient sliding stroke of the slider. A mechanism for unlocking both reels and a cylindrical part in which a plug for detecting cassette information is arranged can be housed in a small space on the rear side between both reels.

[Conventional technology]

First, a conventional example of a tape cassette for a video tape recorder will be explained with reference to FIGS. 4 and 5.

A cassette housing 1 is constituted by upper and lower halves 2 and 3, and a pair of left and right reels 5 wound with a tape 4 are rotatably housed within the cassette housing 1. Teeth portions 6 are formed on the outer peripheries of the lower flanges 5a of both reels 5, respectively. On the rear side between both reels 5, that is, a pair of left and right ribs 17 formed in a substantially arc shape along the outer periphery of both reels 5 integrally with the upper and lower halves 2 and 3, and the rear wall of the upper and lower halves 2 and 3. A slider 7 is disposed on the bottom wall 3b of the lower half 3 in a substantially triangular space surrounded by the sliders 2a and 3a so as to be slidable back and forth. Reel lock levers 8 that engage with the teeth 6 of the reels 5 are arranged on both the left and right sides of the slider 7. That is, both reel lock levers 8 each have a boss portion 9, a claw portion 10, and a projection piece 1.
1, and a boss portion 9 is inserted into a shaft pin 12 that is vertically integrally molded on the lower half 3 and is arranged to be horizontally rotatable. Both reel lock levers 8 are each urged to rotate in the direction of arrow a in FIG. .
In this state, both protruding pieces 11 of both reel lock levers 8 are in contact with the rear end surface 7a of the slider 7. Further, on the rear side of the movement trajectory of the slider 7, a cylindrical part 14 is provided which is vertically integrally molded with the upper and lower halves 2 and 3, and a plug 15 is disposed within this cylindrical part 14 so as to be vertically movable and adjustable. has been done. When the tape cassette is inserted into a video tape recorder (not shown), as shown in FIG.
The vertical position of the cassette is detected, and various types of cassette information such as recorded information are detected.

A conventional tape cassette is constructed as described above. When this tape cassette is not in use, both reel lock levers 8 are torsioned by the coil spring 1.
3 in the direction of arrow a in FIG. 4, both claws 10 are engaged with both teeth 6 of both reels 5. As a result, both claws 10 lock both reels 5 to restrict rotation in the direction of arrow b in FIG. 4, which is the tape feeding direction of both reels 5. Furthermore, when both reels 5 are rotated in the direction of arrow c, which is the tape winding direction, both reel lock levers 8 are rotated in the direction of arrow d against the torsion coil spring 13 so that both claws 10 can be disengaged from both teeth 6. Therefore, rotation of both reels 5 in the direction of arrow c is possible.

On the other hand, when the tape cassette is loaded into the video tape recorder, both reel lock levers 8 are rotated and both reels 5 are unlocked. That is,
When the tape cassette is attached to the video tape recorder, the slider 7 is slid backward (in the direction of arrow e) by the video tape recorder's lock release means (not shown) as shown by the dashed line in FIG. Ru. Then, both protrusions 11 of both reel lock levers 8 are pressed by the rear end surface 7a of the slider 7, and both reel lock levers 8 are rotated in the direction of arrow d against the torsion coil spring 13 as shown by the dashed line. As a result, both claws 10 are separated from both teeth 6 of both reels 5, and both reels 5 are unlocked, and both reels 5 move in the direction of arrows b and c, which are the tape feeding direction and the tape winding direction. It becomes possible to rotate freely in any direction.

[Problem that the invention attempts to solve]

However, the conventional tape cassette described above has the following problems.

That is, in the conventional example, a space on the rear side between both reels 5 housed in the cassette housing 1 is used, and a mechanism for locking and unlocking the two reels 5 and a plug 15 for detecting cassette information are installed here. The inserted cylindrical portion 14 is arranged. However, since the cylindrical part 14 needs to be arranged so as not to interfere with the slider 7 on the rear side of the sliding trajectory of the slider 7, the rear walls 2a, 3 of the upper and lower halves 2, 3
a is a length that is at least the diameter D of the cylindrical portion 14 or more backward than the position where the slider 7 is slid backward;
Only L ₂ was widened. Therefore, on the rear side between both reels 5, a length L ₁ necessary for the locking and unlocking mechanism of both reels 5 and a length L ₂ necessary for the cylindrical portion 14 are required. Although the space on the rear side between both reels 5 is utilized, a new wasted space is created by the cylindrical portion 14, resulting in a problem that the front-to-back length of the cassette housing 1 increases.

Note that if the longitudinal length of the slider 7 is shortened and the cylindrical portion 14 is placed as far forward as possible, the sliding stroke of the slider 7 will become smaller.
The amount of rotation of both reel lock levers 8, that is, the amount of separation when both claws 10 of both reel lock levers 8 are removed from both toothed portions 6 of both reels 5 cannot be obtained sufficiently, and it is difficult to ensure that both reels 5 are locked. This will cause an inconvenience in that it cannot be canceled.

Therefore, the present invention has developed a mechanism for unlocking both reels and a cylindrical part in which a plug for detecting cassette information is installed in a small space on the rear side between both reels, while ensuring a sufficient sliding stroke of the slider. This allows it to be stored and arranged inside.

[Means for solving problems]

The present invention provides the above-mentioned tape cassette.
A notch larger than the diameter of the cylindrical portion is provided on the rear end surface of the slider, and both left and right sides of the notch are configured as a pair of left and right pressing portions, and when the slider is slid backward, the notch is is inserted into the cylindrical part, and the two protruding pieces of the reel lock levers are pressed by the pressing parts on both left and right outer sides of the cylindrical part, so that the reel lock levers are moved against the spring. It is configured to rotate.

[Effect]

In the present invention, when the slider is slid backward, the notch provided on the rear end surface of the slider is inserted into the cylindrical part, so that the cylindrical part can be placed within the sliding locus of the slider. Therefore, while ensuring sufficient sliding stroke of the slider,
A mechanism for unlocking both reels and a cylindrical portion in which a plug for detecting cassette information is disposed can be housed in a small space on the rear side between both reels.

〔Example〕

An embodiment in which the present invention is applied to a tape cassette for a video tape recorder is shown in Figs. 1A to 3 below.
This will be explained based on the diagram. In addition, the above-mentioned [prior art]
Components that are the same as those in the conventional example described in section 2 will be designated by the same reference numerals, and their explanation will be omitted.

First, a notch 21 is provided on the rear end surface of the slider 20 of the present invention. This notch 21 is larger than the diameter D of the cylindrical portion 14 and has a substantially square shape. Therefore, the rear end side of the slider 20 has a substantially U-shaped planar shape, and the left and right sides of the notch 21 are formed into a pair of left and right pressing portions 22 . Note that the tips of both pressing portions 22 are bent at right angles to both left and right sides. Further, as shown in FIGS. 2 and 3, the front end side of the slider 20 has a recess 23 cut out from below with the same width as the notch 21.
A pin 24 is formed to protrude downward from this recess 23.

On the other hand, a guide groove 25 is formed in the left and right center portions of the outer surface of the bottom wall 3b of the lower half 3 in the front-rear direction. A protrusion 26 is formed on the inner surface of the bottom wall 3b of the lower half 3 in correspondence with the guide groove 25.
3 are fitted, and the slider 20 is configured to be able to freely slide back and forth. The pin 24 of the slider 20 passes through a long hole 27 provided in the protrusion 26 and projects into the guide groove 25. The slider 20 is a rib 2 integrally formed on the upper half 2.
8 restricts upward lifting.

The tape cassette constructed as described above is
As shown in the figure, insert the arrow g into the cassette holder 31 from the cassette insertion slot 30 of the video tape recorder.
When the tape cassette is inserted from the direction shown in FIG.
It is positioned by being engaged with a guide 32 provided along the front-rear direction at the left and right center portions of. When the tape cassette is inserted until it contacts the stopper 33 provided at the front end of the cassette holder 31, the pin 24 of the slider 20 is pressed by the rear end 32a of the guide 32, and the slider 20 is moved to the first B. Rearward (direction of arrow e) as shown in the figure
It is slid by. At this time, the notch part 21 of the slider 20 is inserted into the cylindrical part 14, and both the protruding pieces 11 of both the reel lock levers 8 are pressed by both the pressing parts 22 of the slider 20 on both left and right outer sides of the cylindrical part 14. . When both reel lock levers 8 are rotated in the direction of arrow d against the torsion coil spring 13, both pawls 10 are disengaged from both teeth 6 of both reels 5, and both reels 5 are unlocked. be done.

Therefore, when the slider 20 is slid backward, the notch 21 of the slider 20 is inserted into the cylindrical portion 14.
This cylindrical portion 14 can be placed within the sliding trajectory of the slider 20. Therefore, there is no need to widen the rear walls 2a, 3a of the upper and lower halves 2, 3 to the rear beyond the position where the slider 20 is slid rearward for the sake of the cylindrical portion 14, and the locking and unlocking of both reels 5 is made easier. It becomes possible to arrange the cylindrical part 14 within the length L ₁ required for the mechanism. Furthermore, the sliding stroke of the slider 20 is sufficiently large, and the amount of rotation of both reel lock levers 8 can be extremely large.

As is well known, both reels 5 are loosely fitted into a pair of left and right reel fitting holes (not shown) provided in the bottom wall 3b of the lower half 3, and are indicated by a solid line and a chain line in FIG. 1A. It is now moved as shown. Therefore, if both reels 5 move in the direction of arrow f as shown by the dashed line due to an impact or the like while both reel lock levers 8 are locking both reels 5, both teeth of both reels 5 will move. There is a risk that the reel lock lever 8 may become detached from the claws 10 of the reel lock lever 8, and the reels 5 may be unlocked unexpectedly.

However, in this embodiment, as shown in FIG. 1A, with both reel lock levers 8 locking both reels 5, both pressing portions 2 of the slider 20
A gap W is provided between the two protruding pieces 11 of the two reel lock levers 8. That is, even when both reels 5 move in the direction of the arrow f as shown by the dashed line within the cassette housing 1, since there is a gap W, the two reel lock levers 8 are further moved in the direction of the arrow a by the torsion coil spring 13. It is rotated and follows the movement of both reels 5. Therefore, both claws 10 of both reel lock levers 8 do not come off from both teeth 6 of both reels 5, and the locked state of both reels 5 is reliably maintained.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the slider was configured to be slid by inserting the tape cassette into the cassette holder, but this could be configured to be slid by a lock release pin or the like on the video tape recorder side. It is also possible.

The present invention is not limited to tape cassettes for video tape recorders, but can be applied to tape cassettes for various recording and reproducing devices that record and reproduce various types of information using various recording and reproducing methods.

[Effect of idea]

As described above, according to the present invention, while ensuring a sufficient sliding stroke of the slider, the mechanism for unlocking both reels and the cylindrical portion in which the plug for detecting cassette information is disposed are arranged between the two reels. Since it can be stored in a small space on the rear side, there is no need to increase the front-to-back length of the cassette case due to the cylindrical part and create additional wasted space, making the cassette case smaller. can be achieved.

Since the sliding stroke of the slider can be sufficiently large, the amount of rotation of both reel lock levers by this slider is extremely large, and the locking of both reels can be extremely reliably performed.

[Brief explanation of the drawing]

1A to 3 show an embodiment in which the present invention is applied to a tape cassette for a video tape recorder, and FIGS. 1A and 1B show locking and unlocking operations of the reel by a reel lock lever. 2 is an exploded perspective view of the main parts, and FIG. 3 is a longitudinal sectional view of the tape cassette. 4 and 5 show a conventional example of a tape cassette for a video tape recorder, in which FIG. 4 is a plan view of the main part, and FIG. 5 is a sectional view taken along the line -- in FIG. 4. In addition, in the symbols used in the drawings, 1...Cassette housing, 5...Reel, 6...Teeth, 8...Reel lock lever, 10...Claw part, 11...Protrusion piece,
13...Torsion coil spring, 14...Cylindrical portion, 15
... plug, 20 ... slider, 21 ... notch, 22 ... pressing section.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of left and right reels rotatably housed in a cassette housing and each having a toothed portion on the outer periphery, and a pair of left and right reels arranged to be slidable back and forth between the two reels on the rear side. a slider, a pair of left and right reel lock levers each having a claw portion and a protrusion, each of which is biased to rotate by a spring so that both claw portions are engaged with both toothed portions of both reels; and a cylindrical part provided on the rear side of the movement locus of the slider in order to arrange the plug so as to be movable up and down, and by sliding the slider backward, the rear end surface of the slider can move the reels. The two reel lock levers are rotated against the spring by pressing both protruding pieces of the lock lever, and the claws of the two reel lock levers are separated from the teeth of the two reels. In the tape cassette configured to release the lock, a notch portion larger than the diameter of the cylindrical portion is provided on the rear end surface of the slider, and left and right sides of the notch portion are configured as a pair of left and right pressing portions, When sliding the slider backward, the notch is inserted into the cylindrical portion, and the pressing portions press both projecting pieces of the reel lock levers on both left and right outer sides of the cylindrical portion, A tape cassette characterized in that both reel lock levers are configured to rotate against the spring.