JPH06103559B2 - Cassette mounting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading device used in a cassette front loading type video tape recorder or the like.

2. Description of the Related Art In recent years, a cassette loading device of a cassette tape recording / reproducing device such as a video tape recorder (VTR) is mainly a front loading system in which a cassette is loaded from the front side.

Hereinafter, an example of the cassette mounting device described above will be described with reference to the drawings.

FIG. 7 shows the structure of a conventional cassette mounting device. In FIG. 7, 1 is a cassette holder for accommodating a cassette, 2, 2'is side plates arranged on both sides of the cassette holder 1, and 3, 3'is L provided on the side plates 2, 2 '.
It is a V-shaped guide groove, and is usually composed of two or three pieces, respectively. 4,4 'are side wall members integrally formed on both sides of the cassette holder 1, and guide pins 5,5' which engage with the guide grooves 3,3 'provided on the side plates 2,2', respectively.
Are provided corresponding to the number of guide grooves. 6,6 'is axis 7
, Transmission gears rotatably supported on the side plates 2, 2 ', and 8, 8'engage with the transmission gears 6, 6',
In addition, the main guide pins on the side wall members 4 and 4'of the cassette holder 1 described above are provided in the guide grooves 9 and 9'provided at the ends by the rotatable drive arms axially supported by the side plates 2 and 2 ', respectively. 5,5 'are engaged respectively. A drive motor 10 drives the transmission gear 6 or 6 ′ via the gear transmission mechanism 11. Reference numeral 12 is a top plate that connects the side plates 2 and 2 '.

Next, FIG. 8 shows the structure of the cassette holder.

In FIG. 8, reference numeral 13 denotes a release lever which is rotatably supported by the right side wall member 4 of the cassette holder 1 and is biased by a spring to release the lock of the cassette lid 14. Reference numeral 15 denotes a lid opening lever that opens the cassette lid 14, and similarly to the release lever 13, is pivotally supported by the side wall member 4 so as to be rotatable, and a guide pin 16 provided on a part thereof.
Engage with the guide groove 17 provided on the side plate 2.

The operation of the conventional cassette mounting apparatus configured as described above will be described below.

When the cassette is inserted into the cassette holder 1 from the front side, the switch operates, the drive motor 10 starts to rotate, and the drive arm 8, the transmission gears 6 and 6'via the gear transmission mechanism 11 and the transmission gears 6 and 6 '.
Turn 8 '. Therefore, the cassette holder 1 integrated with the guide pins 5, 5'engaged with the guide grooves 9, 9'provided in the drive arms 8, 8'is along the guide grooves 3, 3'of the side plates 2, 2 '. Then, the movement from horizontal movement to vertical movement is performed to complete the cassette loading operation. Generally, when you insert a cassette,
The release lever 13 urged by a spring presses the lock claw of the cassette to release the lock of the cassette lid 14 so that it can be freely opened and closed.

On the other hand, by setting the guide groove 17 provided in the side plate 2 to an appropriate shape, the guide pin engaged with the guide groove 17 of the side plate 2 as the cassette holder 1 moves.
The lid opening lever 15 is rotated in the vertical direction via 16 to push and open the cassette lid 14.

FIG. 9 shows the state in which the cassette lid is opened and closed. As shown by the broken line, the state where the cassette is moved from the state when the cassette is inserted and the cassette lid is opened is shown by a solid line, and the case where the cassette is lowered is shown by a chain line. Show. For vertical movement of the cassette, a fixed lid support member 18 is provided on the cassette mounting device or on the mechanical substrate so that the cassette lid maintains a constant height, and the cassette lid is moved when the cassette descends.
Allow 14 to be naturally retained by support member 18. In addition, the guide pin 16 of the lid opening lever 15 provided on the side plate 2
The groove 17 for guiding the
It usually consists of a groove shape that sandwiches 16.

Generally, various methods have been tried and put to practical use for the lid opening mechanism, but the method described above is the most general method in response to the recent thinning and miniaturization of VTR decks. That is, it is necessary for the tape to get over the various posts on the mechanical substrate during horizontal movement of the cassette, but with the reduction in thickness, the moving height of the cassette should be minimized so that the gap between the tape and the post is minimized. To set. Therefore, since the cassette thickness is larger than the tape width, the cassette lid is pushed a little by some method such as the lid opening lever 15 during horizontal operation of the cassette to prevent it from contacting the posts on the mechanical board, and the vertical direction of the cassette. When descending, the cassette lid is held at a constant height by some kind of support member.

Problems to be Solved by the Invention The reliability of these mechanisms was repeatedly examined,
It can be said that there is almost no problem in practical use. However, there is no guarantee that the lid of the cassette will be completely opened normally. If the lid is opened completely, there is a problem that the configuration is complicated and the number of parts is increased to increase the cost. The case most likely to occur everyday is when the cassette is not in the correct position with respect to the cassette holder and the mounting operation is performed with the cassette slightly retracted. Depending on the shape of the lid opening lever, if the lid opening fails, or if the cassette retracts more than the effective range of releasing the cassette lid lock, the lid opening member may be overloaded or the user may Furthermore, the cassette may be pushed in. Therefore,
In such an abnormal state, if the cassette mounting operation is performed without the cassette lid being completely opened, an excessive load will be applied to each component, or the cassette will contact the post on the mechanical board to cause damage, In some cases, the cassette lid will be lowered with the lid closed, and the tape and each mechanical element will be damaged when trying to perform the tape loading operation in that state, or the mechanical operation will be locked and the cassette cannot be taken out. It had a serious problem.

In view of the above problems, the present invention allows the lid opening lever to rotate more than the normal amount of rotation when the cassette lid is not completely opened, so that the lid opening lever provided on the side plate can be used in a manner other than the normal guide path. (EN) Provided is a cassette mounting device having a safety function of an extremely simple structure which abuts a stopper provided on a side plate to prevent the cassette from further moving.

Means for Solving the Problems In order to solve the above problems, the cassette mounting device of the present invention is a lid opening member that is rotatably mounted by biasing a spring to one side of a cassette holder that stores a cassette, and The rotation position of the lid opening member is brought into contact with the guide pin provided in a part and over the moving region of the cassette holder during normal operation,
It is provided with a structure having a side plate provided with a guide path for restricting both when the cassette lid is opened incorrectly and when it is operated.

Action The present invention has the above-mentioned extremely simple structure to prevent further progress of the cassette and prevent damage to the mechanical elements or the tape when the cassette lid is not opened normally.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a cassette mounting apparatus according to an embodiment of the present invention. In FIG. 1, 19 is a cassette holder, 20 and 20 'are side walls integrally formed on both sides of the cassette holder 19, 21 and 21' are guide pins provided on the side walls 20 and 20 ', and 22 and 22' are Side plates 23 and 23 'arranged on both sides of the cassette holder 19 are L-shaped guide grooves provided in the side plates 22 and 22', each of which is composed of two or three guide pins 21 and 21. ′ Are engaged with each other.
The guide pins 21 and 21 'are provided corresponding to the number of the guide grooves 23 and 23'.

24 is a lid opening lever that is rotatably fitted to a shaft 25 that is integrally formed on the right side wall 20 of the cassette holder 19.
In the case of this embodiment, the weak spring 26 constantly urges in the direction of arrow a. 27 is a guide pin integrally formed at one end of the lid opening lever 24, which is a guide path provided on the side plate 22.
28 engaged. Reference numeral 29 denotes an upper surface plate for connecting the side surface plates 22 and 22 ', and in the case of the present embodiment, it is integrated with the upper surface plate 29 to form a fixed cassette lid supporting portion 30.
Since the configuration other than the above, including the drive system, is basically the same as that of the conventional cassette mounting apparatus described in the prior art, the description thereof is omitted here.

The operation of the cassette mounting apparatus of the present embodiment configured as described above will be described below with reference to FIGS. 2 to 6.

First, FIG. 2 shows a state before the cassette is inserted. The lid opening lever 24 is spring-loaded by the guide passage 28 of the side plate 22 so that the front end portion thereof is located on the lower surface of the cassette lid 31.
The rotation position is regulated against 26. FIG. 3 shows a state in which the cassette is inserted and the lid of the cassette is opened during the horizontal movement of the cassette. Now, about the support shaft 25 of the lid opening lever 24, the moment Mb due to the load of the cassette lid 31 in the arrow b direction is set to be sufficiently larger than the moment Ma caused by the spring 26 in the arrow a direction.
When there is no cassette, the moment Ma is sufficiently larger than the moment Mb 'caused only by the weight of the lid opening lever 24. Therefore, the spring 26 can be omitted if the above conditions are satisfied.

With the above configuration, the guide pin 27 of the lid opening lever 24, which is engaged with the guide path 28 from the point a to the point b, is in contact with the lower surface 32 of the guide path 28. The upper surface 33
Move while touching. Therefore, the lid opening lever 24 is rotated in the direction of arrow a while moving from point C to point D, and the tip end portion 34 of the lid opening lever 24 pushes the cassette lid 31 in the direction of arrow c.

FIG. 4 shows a state in which the cassette is vertically lowered, and the cassette lid 31 is held by the cassette lid supporting portion 30 provided on the upper plate 29. The broken line shows the state of the cassette lid 31 at the end of horizontal operation.

Next, FIG. 5 shows a case where the cassette lid is not opened normally. That is, if the cassette 35 is inserted into the cassette holder 19 in a state of retracting the length l or more from the normal positional relationship shown by the broken line, the lid opening lever 24 swings without contacting the cassette lid 31. Therefore, when the guide pin 27 of the lid opening lever 24 passes through the point B, the lid opening lever 24 urged by the spring 26 does not come into contact with the cassette lid 31 and is largely rotated in the direction of arrow a, and the guide pin 27 moves. Normal guideway on side plate 22
Without coming into contact with 33, it eventually comes into contact with a vertical wall-shaped stopper 36 provided below the stopper. Therefore, an integrated cassette holder via the support shaft 25 of the lid opening lever 24
19 will be prevented from proceeding further. Therefore, if the position of the stopper 36 is set appropriately, not only when trying to continue the insertion operation as it is, but also when the user further pushes the cassette in that state, the cassette is not moved to each post on the mechanical board. It is possible to prevent the cassette lid 31 from coming into contact with the object and falling down while the cassette lid 31 is closed. Further, when the stopped state is reached as described above, the safe operation system is set so as to move in the opposite direction so that the cassette is ejected after a few seconds. As shown in FIG. 6, even if the user rapidly pushes the cassette by hand until the lid opening lever 24 swings the cassette lid 31 and the guide pin 27 comes into contact with the stopper 36, the lid opening lever 24 is pushed by the user. Sets the position and shape of the tip end portion 34 of the lid opening lever 24 that comes into contact with the cassette so that the moment Ma in the direction of arrow a acts.

As described above, according to the present embodiment, when the lid opening member is not normally opened, the lid opening member urged by the spring is configured to be rotatable and the means for restricting the rotation position is provided. However, it is possible to provide a cassette loading device that can easily prevent damage to the mechanical elements or the cassette tape.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to obtain an excellent effect that does not damage the mechanical element or the tape when the cassette is not normally inserted with a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cassette mounting device according to an embodiment of the present invention, and FIGS. 2 to 6 are side views of essential parts showing the operation of the embodiment of the present invention. FIG. 8 is a perspective view of a conventional cassette mounting device, and FIGS. 8 and 9 are a perspective view and a side view showing details of essential parts of a conventional example. 19 ... Cassette holder, 20,20 '... Sidewall, 22,22' ...
… Side plate, 24 …… Lid opening lever, 26 …… Spring, 27
...... Lid opening lever guide pin, 28 ...... guide path, 30 …… cassette lid support, 32 …… guide path lower surface, 33 …… guide path upper surface, 36 …… stopper.

Claims (1)

[Claims] Claims: 1. A cassette holder having a cassette lid which can be opened and closed to allow the tape to be pulled out and which can be attached and detached, a guideway lower surface including a locking member and a guideway upper surface including an inclined surface. When the cassette is inserted into the cassette holder and is rotatable on one side plate of the cassette holder and the cassette is inserted into the cassette holder, it abuts a part of the cassette lid to open the cassette lid. A lid opening member having a contacting portion to be obtained and a position opposed to the contacting portion with the center of rotation interposed therebetween, and a guide pin whose position is regulated by moving the guide path; and the cassette lid is opened. The cassette holder is provided with an elastic member that applies a turning force smaller than the load applied when the cover is opened to the guide pin of the lid opening member toward the lower surface of the guide path of the guide path. When the cassette is inserted into the cassette, the load on the opening of the cassette lid is larger than the turning force of the elastic member, so that the guide pin moves on the upper surface of the guide path and the lid opening member abuts on the inclined surface of the upper surface of the guide path. In contrast to the operation of opening the cassette part while contacting a part of the cassette lid, the cassette holder insertion operation is performed when there is no cassette or the cassette is not completely inserted and the lid cannot be opened normally. When it is performed, the lid opening member is rotated by the elastic member, the guide pin moves on the lower surface of the guide path, and abuts on a locking member formed on the lower surface of the guide path to stop the movement of the cassette holder. A cassette mounting device.