JPH0313886Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette lid opening/closing device, and provides a device in which the cassette lid is automatically opened and closed in conjunction with the lowering and raising operations of the cassette housing. With the goal.

Generally, in a video tape recorder, etc., when a cassette is inserted into the cassette housing at the eject position (up position) and the housing is pushed down to lock in the down position, the cassette lid is opened to allow tape to be pulled out. The lid must be opened. Therefore, a guide member is usually provided in the main body of the video tape recorder, and when the housing is moved downward, the tip of the lid of the cassette comes into contact with the guide member and is guided so that the lid is gradually opened.

However, in the past, the guide member was simply fixed, so the length of the guide surface of the guide member was increased in order to obtain a sufficient opening angle for the lid. There is a drawback that the top edge of the tape comes into contact with the top plate of the cassette case, and if the guide surface is set to a length that does not cause contact, the opening angle of the lid is insufficient and it becomes difficult to pull out the tape. Moreover, when the housing is moved upward, a separate structure for returning the cassette lid to the closed state is required, which results in a complicated structure.

The present invention eliminates the above-mentioned drawbacks, and will be described below with reference to the drawings and an embodiment thereof.

FIG. 1 is a side view of the main parts of a video tape recorder to which an embodiment of the cassette lid opening/closing lid device of the present invention is applied. In FIG. 1, a video tape recorder 1 has a cassette housing 3 mounted on a frame 2 so as to be swingable by rotating levers 4 and 5, and a lid for opening and closing a lid 24 of a cassette 6 housed in the housing 3. An opening/closing mechanism 7 is provided.

The cassette housing 3 consists of a housing body 8 and a cover 9. As shown in FIGS. 2A to 2C, the housing body 8 is formed by bending a metal plate into a U-shape to form a bottom plate portion 8a and symmetrical side plate portions 8b and 8c. Opening 8 into which the reel shaft (not shown) of the main body is inserted
d, has a stopper convex portion 8e, and both side plate portions 8
b and 8c are the front engagement convex portion 8f and the upper convex portion 8, respectively.
g, a rear cut-and-raised engagement convex portion 8h (see Fig. 6), and a pair of pin holes 8i, 8j. Cover 9 is the third
As shown in Figures A to D, the opaque resin plate 10 (window hole 10a
A transparent resin plate 11 (shown with a satin finish in FIG. 3B) is adhered to the lower surface of the base plate (having a matte finish). The plate 11 has a rib plate portion 11a on the lower surface and a pair of L-shaped elastic engagement arm portions 11.
b etc. are provided protrudingly, and the rib plate 11a has a pair of engagement holes 1.
1c, and each engagement arm portion 11b has an engagement hole 11.
It has d.

Next, in order to assemble the housing main body 8 and the cover 9, as shown in FIG. The cover 9 is engaged, and the cover 9 is rotated using this engagement portion as a fulcrum in the direction of the arrow in the figure until it abuts the push-down convex portion 8g. Then, the pair of engagement arm portions 11b respectively fit into the outer surfaces of the side plate portions 8 and move downward, and after riding on the engagement convex portions 8h and being elastically deformed, each of them returns to deformation as shown in FIG. and engages with the engagement protrusion 8h. Thus both 8,
9 are locked together, and the cassette housing 3 is completed as shown in FIGS.
It has a small number of parts and is easy to assemble and disassemble.

This cassette housing 3, as shown in FIG.
Video tape recorder body (pair of fixing pins 1
2, 13), and a pair of rotating levers 4 (only one is shown) pivoted on the fixing pin 12.
The other end pin 14 is supported in each pin hole 8i of both side plate parts 8b, 8c, respectively, and the other end pin 15 of a pair of rotating levers 5 (also only one is shown) is similarly supported on the fixed pin 13. is supported and attached to each pin hole 8j. In addition, the cassette housing 3 in Figure 1
1 shows a state in which the rotation levers 4 and 5 are in the upper rotation restriction position, but as will be described later, the rotation levers 4 and 5
As it rotates to the position indicated by the two-dot chain line in FIG. 1, it moves downward and is locked in a predetermined position.

As shown in Fig. 7, the cassette 6 has a resin case 21.
(having a top plate 21a) stores a pair of reels 23 with tape 22 wound thereon, and has a lid 24 on the front surface that can be opened by rotating α=90° using a pin 33 as a fulcrum. are doing. The lid 24 has a mechanism of a cam part provided thereon and a plate spring (both not shown) of the case 21, so that the lid 24 can be moved from the top and bottom as shown in FIG.
When the lid is within the 20° rotation range (angle β), the lid is forcibly returned to the closed position shown by the solid line, and the lid is rotated from the horizontal direction.
When the rotation range is 20 degrees (angle .gamma.), the lid is forcibly returned to the closed position such as the position of the lid 24 of the cassette 6 in FIG. The cassette 6 with the lid closed as shown in FIG.
When the cassette 6 is pushed in, the lid 24 is projected to the right of the housing 3, and a predetermined portion of the cassette 6 comes into contact with the stopper protrusion 8e of the housing body 8 and is stopped. In this state, the window hole 1 of the cover 3
The cassette 6 can be seen through the transparent plate 11 of Oa.

The lid opening/closing mechanism 7 includes a guide plate 2 mounted on an L-shaped bracket 25 (having a convex portion 25a) as shown in FIGS. 8A and 8B.
6. A guide lever 27 and a coil spring 28 are assembled. The guide plate 26 has an arcuate guide groove 26a and is fixed to the bracket 25 with screws 29 and pins 30. The guide lever 27 has a straight lid guide portion 27a on the upper left side, a lid locking recess 27b on the right end thereof, and a pair of pins 31, 32. The guide lever 27 has pins 31 and 32 that are commonly fitted into the guide groove 26a of the guide plate 26, so that it can slide freely along the guide groove 26a, and a coil spring 28 stretched between the pin 32 and the convex portion 25a. The pin 31 is urged to the left in the figure and comes into contact with the left end of the guide groove 26a and is stopped. As shown in FIG. 1, this lid opening/closing mechanism 7 has a bracket 25 fixed to the bottom plate of the frame 2, and a lid guide portion 27a of a guide lever 27 formed in a notch provided at a position on the lid 24 side of the cassette 6 and biased to one side. A recess (not shown) corresponds to the lower part.

Next, the mounting operation for mounting the cassette housing 3 containing the cassette 6 into the apparatus will be explained. In FIG. 1, when the cassette housing 3 is pushed downward against the spring force of a coil spring (not shown), the pivot levers 4 and 5 move their respective pins 1
The centers of 4 and 15 rotate downward along the locus shown by the dashed line, and the cassette housing 3 and the cassette 6 housed therein also move downward. Then, the tip of the lid guide portion 27a of the guide lever 27 relatively enters into the cassette 6 through the notch recess of the cassette 6, and a predetermined portion of the lid guide portion 27a abuts the tip of the lid 24. Here, when the cassette housing 3 is further moved down, the tip of the lid 24 of the cassette 6 is guided by the lid guide part 27a and slides toward the lid locking recess 27b, and as a result, the lid 24
will be gradually opened.

Next, when the cassette housing 3 and the cassette 6 housed therein move down to the position shown in FIG. 9, the tip of the lid 24 comes into contact with the lid locking recess 27b, but at this time, the extension line of the lid 24 in the figure Since the angle δ formed by the tangent to the guide groove 26a of the guide plate 26 is set to be greater than 90°, the guide lever 27 directs the action of the component of the pressing force received from the lid 24 in the right direction in FIG. receive. Therefore, as the cassette 6 moves further down and the lid 24 is further opened, the guide lever 27 begins to forcibly move to the right in the figure along the guide groove 26a against the spring 28. and at the same time rotate itself gradually clockwise. As mentioned above, the tip of the lid 24 is connected to the lid locking recess 2.
The angle ζ formed between the rear surface of the cassette 6 and the lid 24 when it abuts against the lid 24 is set to be smaller than 20°.

Next, the cassette housing 3 and the cassette 6
10 and the cassette housing 3 is locked by a locking mechanism (not shown), the lid 24 is in an open state aligned in the horizontal direction. At the same time, the guide lever 27 reaches a position where the tip of the lid guide portion 27a is slightly spaced from the rear surface of the cassette 6 and does not contact the top plate 21a, as shown in the figure, and the tip of the lid 24 is completely engaged with the lid locking recess 27b. By fitting together, the lid 24 is relatively stably held in the open position.

Subsequently, the tape 22 in the cassette 6 is pulled out from the opening portion to perform operations such as recording and playback, and upon completion of the operation, is pulled back into the cassette 6 again.

Next, when the eject button (not shown) is pressed to release the lock mechanism, the cassette housing 3 and the cassette 6 housed therein follow the same path as during the downward movement due to the spring force of the coil spring. Then start moving up. Here, since the guide lever 27 is biased to the left in FIG. 10 by the coil spring 28 and presses the lid 24 in the same direction, the fulcrum pin 33 of the lid 24 is
From the point in time when the lid reaches slightly above b, the tip of the lid receives a component of the pressing force in the direction in which the lid is closed. Therefore, as the cassette 6 moves upward, the lid 24
gradually rotates in the direction of closing the lid, and the guide lever 27 gradually moves to the left in Fig. 10 along the guide groove 26a while keeping the tip of the lid 24 in contact with the lid locking recess 27b. Return. Thus, once the overall configuration returns to the state shown in FIG. 9 and the guide lever 27 is stopped, the cassette housing 3 and the cassette 6 housed therein continue to move upward and return to the position shown in FIG. 1. . The lid 24 is the ninth
Lid locking recess 27b of guide lever 27 at the position shown in the figure.
However, since the angle ζ in FIG. 9 is smaller than 20 degrees as described above, the lid guide portion 27b of the guide lever 27 is then automatically moved by the spring force of its own leaf spring. The lid gradually rotates back in the direction of closing while being regulated by the above, and the lid is completely closed when the lid is further separated from the lid guide portion 27a.

According to the above configuration and operation, when the cassette housing 3 is pushed down to move the cassette 6 downward, the lid 2
The guide lever 27 for opening the lid of the cassette 6 gradually moves away from the cassette 6 and finally comes into contact with and does not interfere with the top plate 21a of the cassette 6, so that the cassette 6 can be moved sufficiently downward relative to the guide lever 27. In this way, the lid 24 can be opened sufficiently, and the tape can be pulled out smoothly. Furthermore, when the lid is opened, the guide lever 27 applies a pressing force to the lid 24 in the closing direction by the coil spring 28, so that the lid can be closed in conjunction with the upward movement of the cassette housing 3, which is very convenient. .

In the above embodiment, the lid guide portion 27a of the guide lever 27 is as understood from the configuration shown in FIG.
The structure is such that the cassette 6 protrudes further to the left in the figure, that is, inwardly of the cassette 6, than is necessary when the cassette 6 is housed in the cassette housing 3 at its normal position. The reason for this is that when storing the cassette 6 in the housing 3, even if the housing 3 is pushed down while the cassette 6 is stored in an intermediate position that does not reach its normal position, the lid 24 will still not reach the lid guide portion 27a with the above-mentioned long dimension. This is to prevent the inconvenience of the housing 3 being locked while the lid 24 remains closed, as will be described below. That is, when the housing 3 is pushed down while the cassette 6 is housed in the middle position of the cassette housing 3, the cassette 6 in FIG.
The left end of the guide lever 27 contacts the frame end 2a and the downward movement of the housing 3 is temporarily prevented.
If is short, at this point the tip of the lid 24 will reach below the lid guide portion 27a of the guide lever 27 without contacting the lid guide portion 27a, and the lid 24 will remain closed. Therefore, it is necessary to further push the cassette 6 in the direction of arrow A again to bring the housing 3 to its proper position.For this reason, when the housing 3 is moved further down, the housing 3 moves down while the cassette lid 24 remains closed. This results in the inconvenience of being locked in position. In this sense, the longer the lid guide portion 27a of the guide lever 27 is, the better; however, in reality, as shown in FIG.

As described above, according to the cassette lid opening/closing device according to the present invention, the guide member for opening or closing the cassette lid is movable and can be moved to the fixed guide member to move the guide member toward or away from the cassette. Therefore, when opening the lid, the movable guide member opens the lid and moves in the separating direction to open the lid by a sufficient angle without interfering with the cassette. However, when the lid is closed, the movable guide member can be moved back using the biasing force of the biasing means stored by the movement of the movable guide member in the above-mentioned separation direction. It is extremely convenient because the structure is simple and does not require any special mechanism, and the lid opening and closing operations are performed gradually as the movable guide member moves, so it is extremely smooth.
Since the direction of the sloped part of the movable guide member is slanted with the side near the stored cassette as the top, even a cassette with a short pivot point for opening/closing the lid can be opened reliably, and the sloped part Since the upper part is configured to escape downward through a substantially inverted arch-shaped guide groove, it does not get in the way of the downward movement of the cassette, and the opening part is provided at a position lower than the raised position of the cassette. This contributes to making the entire device thinner, and since the inclined part is configured to move in the direction away from the cassette by the approximately arcuate guide groove, the inclined part can be sufficiently extended in the direction toward the cassette. Therefore, even if the cassette is inadvertently stored in a direction away from the sloped part, the sloped part will surely come into contact with the lid and the lid can be opened.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of a video tape recorder to which an embodiment of the cassette lid opening/closing device of the present invention is applied, and FIGS. 2A to 2C are a plan view, a side view, and a front view of the housing body, respectively. , 3A to 3D are the rear view, bottom view, front view, side view, and fourth view of the cover, respectively.
5A and 5B are a side view and a front view of the cassette housing, respectively. FIG. Figure 7 is a perspective view of the cassette;
Figures A and B are side and front views of the lid opening/closing mechanism for opening and closing the lid of the cassette, respectively, and Figures 9 and 10 are side views illustrating the sequential operations of the main parts of the video tape recorder, respectively. It is a diagram. DESCRIPTION OF SYMBOLS 1... Video tape recorder, 3... Cassette housing, 6... Cassette, 7... Lid opening/closing mechanism, 8... Housing body, 9... Cover, 22
... Tape, 24 ... Lid, 25 ... L-shaped bracket (fixed part), 26 ... Guide plate (fixed guide member), 26a ... Guide groove, 27 ... Guide lever (movable guide member), 27a ... ...Lid guide part (slanted part), 27b...Lid locking recess, 31, 32...
...Pin, 33...Fulcrum pin (rotation fulcrum).

Claims (1)

[Scope of Claim for Utility Model Registration] A tape cassette 6 is housed in the housing 3 and is equipped with a lid 24 that opens and closes the front surface of the casing 8 around a pivot point 33 provided very close to the front surface of the casing 8. A cassette lid opening/closing lid device in which the lid 24 is opened and closed in conjunction with the lowering and raising of the housing 3 to the mounting position of the device, and includes a fixed guide member 26 in which a substantially inverted arch-shaped guide groove 26a is formed; , Pins 31 and 32 are loosely fitted into the guide groove 26a to be movable, and one end is attached to the other end of the spring member 28 attached to the fixed part 25,
This panel member 28 is biased in a direction approaching the cassette 6 housed in the housing 3, and when the cassette 6 is lowered, it comes into contact with the lid 24 to open the lid 24 and close the housing. an inclined portion 27a whose upper part is near the side of the cassette 6 to be stored, and a tip of the lid 24, which is provided at a position opposite to the stored cassette 6 at a height lower than the raised position of the cassette 6, and which is opened. When the cassette 6 is raised, the lid locking part 27b contacts the opening lid 24 to close the lid, and the lid 24 is stored in accordance with the pressing force of the tip of the lid 24. A movable guide member 27 is movable in a direction away from the cassette 6, and has a shape in which the upper part of the inclined portion 27a moves downward in accordance with the descent of the cassette 6, and is moved along the guide groove 26a. An opening/closing lid device for a cassette lid, characterized by comprising: and .