JPH0629802Y2 - Cassette opening mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is a recording / handling apparatus for handling a tape cassette having a rotary lid, such as a tape for a digital audio tape recorder (DAT) or a video tape. Regarding a lid opening member for opening a rotary lid in a reproducing apparatus (hereinafter, simply referred to as an apparatus), particularly, the engagement relationship between the rotary lid and the lid opening mechanism is supplied from different producers in the process of mounting a cassette. The present invention relates to an opening member capable of reliably maintaining all tape cuts.

Problems of the Prior Art Conventional tape cassettes for digital audio tape recorders (hereinafter simply referred to as "cassettes") receive functional parts such as tape pull-out pins and pinch rollers in the device, and these function as tapes in the cassettes. An access opening is provided for engaging or ready for engagement, and a circular opening for receiving a pair of reel shafts of the apparatus and engaging a bearing hole of a reel in the tape cassette. In order to prevent dust from entering through these openings when the tape cassette is not in use, a sliding lid is provided on one side of the tape cassette and a rotating lid is provided on the other side. By opening and closing the circular opening and the access opening and opening and closing the rotary lid, the functional components of the device can pull out the tape in the tape cassette from the tape cassette to a recordable / reproducible position. .

For convenience of explanation, in the present specification, the cassette holder of the device has an insertion opening on the front side when viewed from the operator,
When inserting the tape cassette into the insertion opening of the cassette holder, the rotary lid of the tape cassette is arranged in front of the main body of the tape cassette, and the sliding lid of the tape cassette is arranged below the main body of the tape cassette. It is explained as a thing. Further, in the device, the loading / unloading position where the tape cassette is inserted into or removed from the cassette holder and the tape cassette inserted in the cassette holder is
It is described as having a cassette holder that moves with respect to a mounting position that is engaged with functional parts such as tape pull-out pins, tension pins, pinch rollers, or the like, or is set to be engageable. Further, the lid opening mechanism is arranged to engage with the front and side regions of the tape cassette on at least one side of the moving path of the tape cassette in the mounting operation.

FIG. 9 is a rear view of a part of the casing 50 of a typical DAT tape cassette with the rotary lid 60 opened.

The rotary lid 60 has a front wall 61, a pair of side walls 62 extending from both ends of the front wall, and a rotary shaft 63 extending inward from each of the side walls. (Only one of which is shown) is rotatably supported by a bearing provided on the one side, and is biased toward the closed position by a biasing means (not shown).
The upper side wall 81 of the tape cassette 50 is arranged close to the inner side surface 62b of the side wall 62 of the rotary lid 60.

The sliding lid 70 includes a lower side wall 71 extending along a lower side wall (not shown in the figure) of the tape cassette 50 and a pair extending along both side walls (not shown in the figure) of the lower member. Side wall (not shown in the figure) and engaging means (not shown) for slidably engaging the side wall of the lower member 90 and the side wall of the sliding lid. The sliding lid 70 is biased toward the closing position by a biasing means (not shown),
Moreover, the relative positions of the sliding lid 70 and the tape cassette 50 can be locked at two positions, the open position and the closed position.

When both the rotary lid body 60 and the sliding lid body 70 are in the closed position, the front side surface of the tape cassette 50 is closed by the front wall of the rotary lid body 60, and the front portion of the side surface of the tape cassette 50 is a rotary lid. It is closed by the side wall of the body and the side wall of the sliding lid.

The sliding lid 70 is provided on the cassette holder with the tape cassette 50.
During the inserting operation, the claws provided on the cassette holder side are opened. When the sliding lid 70 is moved to the open position, the access opening (7th) in the lower surface of the front area of the tape cassette 50 that receives the above functional parts of the apparatus.
Fig. 51) is opened and also a circular opening (not shown) for receiving the reel shaft is opened.

The rotary lid 60 is opened by the lid opening mechanism while the cassette holder is moved to the mounting position with the sliding lid 70 open.

Although various types of lid opening mechanisms are known, the lid opening mechanism of the present invention is disclosed in Japanese Patent Application No. 63-73768 and Japanese Utility Model Application No. 6-6.
In regard to the improvement of the lid opening mechanism of the type previously proposed by the applicant of the present application in 3-93638 and Japanese Utility Model Application No. 63-94886.

As described in the accompanying drawings of the present application, the lid opening mechanism of the above-described type has a lid opening member 10 pivotally attached to a recording / reproducing apparatus and a first lid opening member. And the rotation limiting means 30 for limiting the opening between the first lid and the second position.
Urging means 40 for urging toward the position.

The lid opening member 10 engages with the rotary lid body 60 of the tape cassette 50 to open the rotary lid body in the process of the mounting operation, and the lid lid engaging surface is inclined forward and downward (first surface). )
12a and a third surface 12 adjacent to the front of the first surface 12a.
c is formed, and a front end ridge line B is formed between the opening cover engaging surface 12a and the third surface 12c.
Adjacent to the rear of a, a push-back engagement surface (second surface) 12b that slopes downward and rearward is provided, and a top ridge line A is formed between the open-cover engagement surface 12a and the push-back engagement surface 12b. A fourth surface 12d is formed adjacent to and behind the second surface, and a ridge line C is formed between the push-back engagement surface 12b and the fourth surface 12d.

The first feature of this lid opening mechanism is that the lid opening engagement surface 12a is engaged with the lower side surface 61a of the front wall 61 of the rotary lid body to rotate the rotary lid body in the lid opening direction and the top ridge line. The rear surface 61b of the front wall of the rotary lid body is connected to the rear surface 61b of the front wall 61 of the rotary lid body 60 in an intermediate step between the final stage of maintaining the rotary lid body in a completely opened state. The ridge B is slid into engagement to prevent the tape cassette from being pushed back in the cassette holder.

The second feature of this lid opening mechanism is that the tape cassette 50 that is insufficiently inserted in the cassette holder is engaged with the push-back engaging surface 12b during the mounting operation, and the rotary lid is not opened. It is to prevent it from being set to the mounting position in this state.

The third feature of this lid opening mechanism is that the ridge line C is engaged with the lower side surface 62a of the side wall 62 of the rotary lid body in the final stage of the mounting operation to define the second position of the rotary lid body. The height of the ridge A is defined, and the maximum pushback distance of the tape cassette in the pushback operation is determined.

Generally, in order to share a tape cassette supplied from a different producer with a device supplied from a different producer, the tape cassette is standardized with respect to its outer shape and some dimensions. Not all the details of the cassette are standardized in size and shape. Therefore, the size and shape of the details of the cassette casing will vary from manufacturer to manufacturer of tape cassettes. For example, the thickness of the side wall of the rotary lid is 1 mm to 0.7 m.
The shape of the front end portion of the upper side wall 81 of the tape cassette 50 varies considerably within the range of about m, and extends considerably downward along the inside of the front wall of the rotary lid (see FIG. 7).
And some that do not extend downwards at all (see FIG. 3).

Therefore, under the present circumstances, it is necessary to consider that the lid opening mechanism operates without any trouble in all of the tape cassettes having such a change.

Although the lid opening mechanism proposed in the above application worked satisfactorily for their intended purpose, it proved to be a problem for some types of tape cassettes. The first obstacle is that, in a tape cassette of a type in which the side wall of the rotary lid is extremely thin, the side end portion 81a of the upper side wall 81 of the tape cassette 50 juts out closer to the side surface of the tape cassette. That is, the push-back engagement surface 12b may collide with the upper side wall 81 of the upper member of the tape cassette in the process of opening the lid. When this collision occurs, the movement of the tape cassette to the mounting position is blocked, and there is a possibility that the mounting operation of the tape cassette may not be performed correctly.

The second obstacle is that when the front end of the upper side wall 81 of the upper member of the tape cassette 50 extends downward 82 inside the rotary lid, the push-back engaging surface 12b and the lower side of the upper side wall are described. The timing of the collision with the extension portion 82 is advanced.

In order to avoid this problem, the push-back engagement surface 12b
Can be shifted laterally outward, but in order to ensure the function of the rear end ridgeline C at the mounting position, the rear end ridgeline C is formed inside the inner side surface 62b of the side wall 62 of the rotary lid 60. It is desirable to extend.

Means for Solving the Problems The basic feature of the present invention is that the inner surface of the portion forming the push-back engagement surface is slightly cut out (slightly set back outward in the lateral direction), and is located below the ridge line of the rear end portion. By leaving the protruding portion projecting inward in the part, the projecting dimension of the push-back engaging surface (engagement width between the push-back engaging surface and the lower side surface of the rotary lid) is slightly reduced, but in normal mounting operation It completely preserves the function of the rear ridge.

A further feature of the present invention is that in the type in which the front end of the upper side wall of the tape cassette extends downward along the inner side of the front wall of the rotary lid, the above-mentioned protrusion collides with the lower extension. The possibilities still remain. Therefore, only in such a case, the collision is avoided by allowing the opening member to escape laterally outward. That is, the upper side surface of the protruding portion is chamfered from the outside to the inside of the tape cassette so as to be inclined, and when the downward extension portion of the upper side wall collides with the inclined surface, the opening member is laterally outwardly moved. Slide it. For this purpose, there is provided a biasing means for biasing the opening member from the outer side to the inner side of the side surface of the tape cassette.

The outline of the present invention has been described above, but in order to better understand the technical idea of the present invention, the present invention will be described in detail below based on the embodiments of the present invention and with reference to the drawings.

Embodiment FIG. 1 is a side view of a lid opening mechanism according to the present invention, and FIG.
It is a rear view of the lid opening mechanism of FIG.

The lid opening mechanism includes an lid opening member 10, a rotation limiting member 30, and a biasing means 40.

In this embodiment, the lid-opening member 10 includes a pivot portion 11 having a pivot shaft 11a formed integrally with the lid-opening member, and a first arm portion 12 extending upward from the pivot portion. It is shown as having a second arm portion 13 having a pin 13a extending rearward (leftward in FIG. 1) from the pivot portion and extending substantially parallel to the pivot axis 11a.

The rotation limiting means 30 is shown as a U-shaped member in this embodiment, and the rotation shaft 11a of the opening cover member 10 is rotatably pivotally attached to a vertical portion 31 of the rotation limiting means 30, and a pair of legs 32 is provided. .3
3 is shown as limiting rotation of the pin 13a integrally formed with the lid opening member 10.

The biasing means 40 includes a winding portion 41 wound around the rotating shaft 11a.
And one end portion 4 locked to the second arm 13 of the lid opening member
2 and a torsion coil spring having the other end portion 43 locked to the leg portion 33, the opening lid member 10 is biased counterclockwise in FIG.

The opening cover member 10 has a first surface (opening cover engaging surface) 12a inclined forward and downward at the free end of the first arm portion 12.
And a third surface 12c adjacent to the front and extending downward.
And a second surface (push-back engagement surface) 12b that is adjacent to the first surface and inclines rearward and downward, and a fourth surface 12d that is adjacent to the rear of the second surface, First and second
A top ridge line A is formed between the first face and the third face, a front end ridge line B is formed between the first and third faces, and a rear end ridge line C is formed between the second and fourth faces. .

In this embodiment, the widened portion 12a 'widened in the lateral direction over a part of each of the first surface and the third surface.
Are also shown as having.

The structure described above is similar to the opening mechanism shown and described in the applicant's above-mentioned application.

FIG. 3 is a side view showing the opening member 10 of FIGS. 1 and 2 and a part of the tape cassette 50, and shows a state in which the mounting operation is completed. FIG. 4 is a rear view showing a part of the front portion of the tape cassette 50 in a state where the rotary lid body 60 is opened, and the right half (omitted portion) of FIG. 4 is the left side shown in the figure. It is symmetrical with half. Fifth
6 and 6 are plan views showing a part of the opening cover member 10 and a part of the tape cassette 50 in the state of FIG. 3, and FIG. 5 shows the thickness of the side wall 62 of the rotary cover body 60. Is thick (d
₂ ) The tape cassette 50, and FIG. 6 shows the tape cassette 50 in which the side wall of the rotary lid is thin (d ₁ ).

With reference to FIGS. 3 to 6, the tape cassette 50 is in a state in which the sliding lid body 70 and the rotating lid body 60 are opened. With particular reference to FIGS. 5 and 6, the opening member 10 is arranged to engage the front side portion of the tape cassette 50. When the side wall 62 of the rotary lid 60 is thick, the side edge portion 81a of the upper side wall 81 of the upper member 80 of the tape cassette 50 is
It does not collide with the second engagement surface 12b (Fig. 5).
When the thickness of the side wall 62 of the rotary lid 60 is thin (d ₂ ), the side edge portion 81a of the upper side wall 81 of the upper member of the tape cassette 50 projects laterally (left side in FIG. 6) by that much. , And collides with the second engaging surface 12b in the process of mounting operation (FIG. 6).

In the lid opening mechanism of the present invention, the inner surface (the surface on the right side in FIG. 2) of the first arm 12 of the lid opening member 10 where the second engagement surface 12b is formed is cut out, and the cutout is formed. A protruding portion 12f that protrudes inward in the lateral direction is formed below the portion. This prevents the upper side wall from colliding with the second engagement surface 12b during the mounting operation. In other words, in the course of the mounting operation of the tape cassette 50, the position of the push-back engagement surface 12b of the opening lid member 10 is slightly laterally outward (right side in FIG. 6) with respect to the path along which the side surface of the tape cassette 50 moves. Move and second
The protruding portion 1 protruding laterally inward below the engaging surface 12b of the
It can be considered that 2f is provided. Therefore, the engagement width (lateral dimension) between the rotary lid 60 and the second engagement surface 12b is reduced (d _{0 in} FIG. 6). However, by accurately positioning the positional relationship between the lid opening member 10 and the moving path of the tape cassette in the mounting operation, it is possible to prevent the tape cassette 50 from being inserted into the cassette holder when the mounting operation is performed insufficiently. The second engagement surface (push-back engagement surface) 12b can be reliably engaged with the lower side surface 61a of the front wall 61 of the rotary lid 60 with the tape cassette to push back the tape cassette. Protrusion 1
By providing 2f, it is possible to completely maintain the function of the rear end ridgeline C. More specifically, the pushback distance of the tape cassette that is insufficiently inserted in the cassette holder is defined, and when the mounting operation is completed, the side wall 62 of the rotary lid body is
To define a second position of the lid opening member 10 in contact with the lower side surface 62a, thereby defining the height of the top ridge A, and thereby accurately defining the open state of the rotary lid 60. You can

FIG. 7 is a side view of a portion of the tape cassette 50. In this tape cassette, the front end of the upper side wall 81 has an extension portion 82 extending downward. As easily understood from the comparison with FIG. 3, in the tape cassette 50, the extension portion 82 collides with the protrusion 12f at the final stage of the mounting operation. An embodiment which avoids this problem is shown in FIG.

In the embodiment of FIG. 8, the upper surface 12 of the protrusion 12f is
g is slanted downward in the lateral direction. In this embodiment, the rotating shaft 11a of the opening cover member 10 is supported so as to be movable laterally (left and right in FIG. 8) with respect to the bearing (provided on the vertical extension portion 31 of the rotation restricting member 30). ing. A stopper 11b is provided at the free end of the rotary shaft 11a to move the lid opening member 10 in the lateral direction at a first position (position shown in FIG. 8) and a second position (in FIG. 8). The position is closer to the left side). Open the lid member 10,
In this embodiment, the biasing means for biasing the opening cover member 10 toward the first position in the lateral movement is the torsion coil spring 4 that biases the opening cover member 10 toward the first position in the rotation direction.
It is shown as commonly used with 0. More specifically, the torsion coil spring 40 can be compressed in the axial direction of the rotating shaft 11a by winding the winding portion 41 at a large pitch.

Thus, in the final stage of the mounting operation, when the extended portion 82 of the upper side wall collides with the inclined upper side surface 12g of the protrusion 12f, the opening cover member 10 is pushed laterally outward (left side in FIG. 8). At this time, since the biasing means 40 pushes the lid member 10 inward in the lateral direction, the rear end ridge line C
Securely engages the lower surface 62a of the side wall 62 of the rotary lid,
Accurately define the height of the top ridge A.

The rotation restricting means 30 for restricting the rotation of the opening cover member in the above-described embodiment is not limited to the illustrated structure, and it is obvious that those skilled in the art can have various modifications.

Further, the means for displacing the opening cover member 10 to the first position of the lateral movement is illustrated and described as being used in common with the torsion coil spring that is biased to the first position in the rotating direction of the opening cover member. It is also clear that separate biasing means may be provided and that there may be various variations of such biasing means.

Further, in FIG. 8, the axial dimension of the bearing in the rotation restricting member for guiding the lateral movement of the opening cover member is the rotation shaft 11.
Although smaller than the diameter of a, it is clear that it is better to reverse their dimensional ratio in order to stabilize the direction of lateral movement.

Although the present invention has been described in detail with reference to the embodiments of the present invention, the present invention is not limited to these embodiments.
Various modifications can be made without departing from the technical idea of the present invention.

[Brief description of drawings]

FIG. 1 is a side view of the lid opening mechanism according to the present invention, FIG. 2 is a rear view of the lid opening mechanism of FIG. 1, and FIG. 3 is a lid member 10 of FIGS. FIG. 4 is a side view showing part of the tape cassette 50, showing a state where the mounting operation is completed, and FIG. 4 is a rear view showing a part of the front portion of the tape cassette 50 in a state where the rotary lid body 60 is opened. 5 is a plan view showing a part of the opening lid member 10 and a part of the tape cassette 50 in the state of FIG. 3, in which the side wall 62 of the rotary lid body 60 has a large thickness.
FIG. 6 is a plan view showing a part of the opening lid member 10 and a part of the tape cassette 50 in the state of FIG. 3, in which the side wall 62 of the rotary lid body 60 has a thin thickness. Cassette 50
FIG. 7 is a side view of a portion of a tape cassette 50 having a different shape, FIG. 8 is a rear view of a lid opening mechanism according to another embodiment of the present invention, and FIG. 9 is a typical DAT 3 is a rear view of a part of the tape cassette 50 of FIG. 1, showing a state in which a rotary lid is opened. DESCRIPTION OF SYMBOLS 10 ... Opening lid member, 11 ... Pivoting portion, 11a ... Rotating shaft, 12 ... First arm portion, 12a ... First surface (opening lid engaging surface), 12b ... ... second surface (push-back engagement surface), 12c ... third surface, 12d ... fourth surface, 12
a '... widened portion, 12f ... protruding portion, 12g ... upper side surface of protruding portion, 13 ... second arm portion, 13a ... pin, A ... top ridge line, B ... front end ridge line, C ...... The ridgeline,
30 ... Rotation limiting member, 31 ... Vertical portion, 32, 33
...... Legs, 40 …… Biasing means, 41 …… Winding section, 42 ・ ・ ・
... one end, 43 ... the other end, 50 ... tape cassette,
60 ... rotary lid, 61 ... front wall of rotary lid, 61a ...
... Lower side surface of front wall of rotary lid, 62 ... Side wall, 62a ...
Lower surface of side wall, 63 ... Rotating shaft, 70 ... Sliding lid, 7
1 ... Lower side wall, 80 ... Upper side member, 81 ... Upper side wall, 8
1a ... side edge of upper wall, 82 ... extension, 90 ...
Lower member,

Claims (4)

[Scope of utility model registration request] 1. A lid member rotatably pivotally mounted on a magnetic recording / reproducing apparatus, and a rotation limitation for limiting the rotation of the lid member between a first position and a second position. Means and biasing means for biasing the lid opening member to a first position, the lid opening member extending upward from a pivot portion thereof.
A first surface (opening engagement surface) inclined forward and downward to engage the rotary lid of the tape cassette to open the rotary lid at the free end of the arm portion of In the opening mechanism that is adjacent to the rear of the first surface and is inclined rearward and downward, that is, a second surface (push-back engaging surface), a) the lateral direction of the area forming the push-back engaging surface. A lid opening mechanism characterized in that an inner side surface is cut out, and a projecting portion projecting inward in a lateral direction is formed below the cutout portion. 2. The opening mechanism according to claim 1 for utility model registration, wherein a) means for movably supporting the opening member in the lateral direction, and b) lateral movement of the opening member. Is further provided between the first position and the second position, and c) a biasing device that biases the opening member toward the first position in the lateral movement, and d) the protrusion. The lid opening mechanism is characterized in that an upper surface of the portion is provided with an inclined surface that is inclined downward from the outer side in the lateral direction. 3. The opening mechanism according to claim 2 of the utility model registration, wherein the biasing means for biasing the opening member toward the first lateral position is the bearing and the arm portion of the opening member. A lid opening mechanism characterized by being a spring arranged between and. 4. A lid opening mechanism according to claim 3 of the utility model registration claim, wherein the spring is a spiral coil spring having a gap between adjacent screwing portions, and is the first in the rotating direction of the lid member. The opening mechanism is characterized in that it has both a bias to the position of and a bias to the first position in the lateral direction.