JPH051546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a lid opening device for a cassette loading device that is most suitable for application to a cassette type recording and reproducing device such as a cassette type video tape recorder.
In particular, a front lid is rotatably attached to the cassette housing to cover the front side of the tape that is stretched along the front opening provided in the cassette housing, and a front lid that is rotatably attached to the cassette housing to cover the front side of the tape that is stretched along the front opening provided in the cassette housing; A tape cassette having a rear lid rotatably attached to the front lid to cover the tape is used, and when the tape cassette is installed from the cassette insertion position to the cassette mounting position, the lower end of the front lid is relatively It is provided at the cassette mounting position so that the front cover and the rear cover are pushed up and rotated in conjunction with each other from a closed position on the front and rear surfaces of the tape to an open position on the upper part of the cassette case. The present invention relates to a lid opening device for a cassette loading device having a lid opening member having a lid opening member.

[Background technology and its problems]

First, an example of a tape cassette used in a cassette mounting device for this type of cassette type video tape recorder will be explained with reference to FIGS. 1 and 2.

First, as shown in FIG. 1, a cassette housing 3 composed of upper and lower halves 1 and 2, a front lid 4, and a rear lid 5 are each molded from synthetic resin. Then, a magnetic tape (hereinafter simply referred to as tape) 8 wound on a pair of left and right reels 6 and 7 is attached to the upper and lower halves 1,
The upper and lower halves 1 and 2 are fitted into each other from above and below and connected together with a plurality of screws (not shown) to form a cassette housing 3. A front opening 10 is provided on the front surface of the cassette housing 3 over the entire length in the left and right direction, and a pair of openings 10 are formed integrally within the cassette housing 3 at positions near both left and right ends of the front opening 10. The tape 8 is guided by a tape guide 11 and stretched along the front opening 10 as shown in FIG. In addition, the cassette housing 3 has a recess 1 on the rear side of the front opening 10 inside the pair of tape guides 11.
2 is formed, and this recess 12 is formed into a storage area for both reels 6 and 7 in the cassette casing 3 by a partition wall 13 integrally molded in the cassette casing 3 and having a rectangular planar shape. It is partitioned on the side.
Note that both the top and bottom of this recess 12 are open.

Next, the front cover 4 has a rectangular planar shape as shown in FIG. 1, and a pair of fulcrum pins 15 are integrally molded on the inside of both left and right ends 4a so as to be coaxial with each other. As shown in FIG. 2, the front cover 4 has a pair of fulcrum pins 15 on the front end sides of the left and right side walls 3a of the cassette housing 3 in order to cover the front side of the tape 8 stretched along the front opening 10. The front cover 4 is attached to the cassette housing 3 by being inserted into a pair of pin insertion holes 16 provided on the same axis, and the front cover 4 is attached to the cassette housing 3 so as to be able to rotate up and down about both fulcrum pins 15. ing.

Next, as shown in FIG. 1, the rear lid 5 is integrally molded with an upper lid 17 along its upper edge, and a pair of fulcrum pins are provided at the center of the left and right edges of the rear lid 5 in the vertical direction. 18 are integrally molded with each other on the same axis. As shown in FIG. 2, the rear cover 5 has a tape 8 stretched along the front opening 10.
It is arranged parallel to the front cover 4 in the recess 12 to cover the rear side of the cover. The rear lid 5 has its pair of fulcrum pins 18 connected to a pair of pins of a pair of protrusions 19 that are integrally molded on the rear surface of the front lid 4 at positions near both left and right ends 4a, as shown in FIGS. 1 and 2. The rear cover 5 is attached to the front cover 4 by being inserted into the insertion hole 20 from the inside, and the rear cover 5 is attached to the front cover 4 so as to be pivotable up and down about both fulcrum pins 18. Note that the upper lid 17 is arranged to cover the upper surface of the recess 12 as shown in FIG.

Next, as shown in FIGS. 1 and 2, the left and right ends 13a of the partition wall 13 are opposed in parallel from the left and right directions, and the opposing surfaces of the left and right ends 13a have gently bent lower ends. A pair of guide grooves 21 having a J shape are provided. Further, the upper ends 21a of both guide grooves 21 are open. A pair of projecting pieces 22 are integrally formed below both fulcrum pins 18 on the rear surface of both left and right edges of the rear cover 5,
A pair of guided pins 23 integrally formed on the outside of both protrusions 22 so as to be coaxial with each other are loosely fitted into both guide grooves 21 . Although not shown,
The front cover 4 is rotatably biased by a spring in the direction of closing the cover, which is the direction of arrow a in FIG. 2, and is configured to be locked by a lock lever in the closed position.

The tape cassette is constructed as described above.
First, when the cassette is not in use, the front cover 4 is
As shown by the solid line in the figure, the front surface of the tape 8 is locked in the closed state. In this lid closed state, the tape 7 that is stretched along the front opening 10 is wrapped around from the front and back by the front lid 4 and the rear lid 5, creating a so-called completely sealed tape cassette. It is becoming.

Next, when the tape cassette is inserted into the video tape recorder, the front cover 4 is unlocked and the front cover 4 is opened in the direction of arrow a'.
The front opening 10 is opened by rotating 90 degrees. The front cover 4 is then rotated about 90 degrees in the direction of arrow a' from the closed position shown by solid lines in FIG. 2 to the open position shown by imaginary lines about both fulcrum pins 15. Therefore, since both fulcrum pins 18 of the rear lid 5 are also rotated in the same direction and at the same angle, the rear lid 5 moves in conjunction with the front lid 4 from the virtual closed position shown by the solid line in FIG. The cassette housing 3 is rotated to the upper lid opening position indicated by the line. At this time, by rotating both fulcrum pins 18 in the direction of arrow a', both guided pins 23
is guided by both guide grooves 21 and moved in the direction of arrow c', and by the guiding action of both guide grooves 21, rear cover 5 moves in the direction of arrow d' with respect to front cover 4 around both fulcrum pins 18. The lid is opened in the direction of arrow a' while being rotated in a direction in which the front lid 4 is moved away from the rear. When the lid is closed, the front lid 4 is rotated in the direction of arrow a in FIG. The guide pin 23 also moves in the direction of the arrow c within the guide groove 21 and returns to the lower end of the guide groove 21 shown by a solid line in FIG. 2.

Next, FIGS. 3 and 4 show conventional examples of a lid opening device for a cassette loading device in a video tape recorder to which a tape cassette constructed as described above is loaded.
This will be explained using figures.

First, as shown in FIG. 3, the tape cassette is moved from the cassette insertion position indicated by the two-dot chain line to the position indicated by the one-dot chain line in the direction of arrow e by the cassette attachment mechanism (not shown) of the cassette attachment device 26. is pulled in horizontally. Thereafter, the tape cassette is vertically lowered in the direction of arrow f and is mounted to the cassette mounting position shown by the solid line. An elongated plate-shaped opening member 27 is vertically disposed at the cassette mounting position of the cassette mounting device 26, and when the tape cassette reaches the position indicated by the one-dot chain line,
At a position near one end 4a of the front lid 4 of the tape cassette, its lower end 4b is connected to the upper end 27a of the opening lid member 27.
located above. Immediately after the vertical descent of the tape cassette starts, the lower end 4b of the front lid 4 moves to the opening lid member 2.
The lower end 4b of the front lid 4 is pushed up relatively by the upper end 27a of the opening lid member 27 as the front lid 4 continues to descend. As a result, as described above, the front cover 4 and the rear cover 5 move in conjunction with each other, and the arrow moves from the closed position to the open position above the cassette housing 3.
The lid is opened by rotating in the a′ direction. When the tape cassette is vertically lowered, as shown in FIG. The lid opening member 27 is relatively inserted into the slit-shaped notch 28 .

Next, as described above, when the front cover 4 and the rear cover 5 are opened and the tape cassette is installed in the cassette mounting position, the tape drawer guide 29, inclined guide 30, etc. on the video tape recorder side are moved around the cassette housing 3. It is inserted relatively into a recess 12 provided on the rear side of the front opening 10. Then, the tape 8 is
will be pulled out from the front opening 10.

However, the above-mentioned lid opening device for the cassette loading device has the following problems.

That is, in the so-called front loading type cassette loading device in which the tape cassette is pulled in horizontally from the cassette insertion position and then vertically lowered and loaded into the cassette loading position as described above, the downward stroke of the tape cassette is This should be determined on the condition that the tape cassette can pass above the tape pull-out guide 29, inclined guide 30, etc. when being drawn in horizontally. In other words, the downward stroke of the tape cassette is equal to the height of the tape drawer guide 29, inclined guide 30, etc.
It is sufficient that it is larger than H ₁ to the minimum extent necessary.

However, in the tape cassette having the front lid 4 and the rear lid 5 as described above, when the front lid 4 and the rear lid 5 are rotated from the closed lid position to the open lid position, the cassette housing The front cover 4 is positioned above the rear cover 5 in the upper part of the body 3, thereby securing a space in the recess 12 of the cassette housing 3 into which the tape pull-out guide 29, inclined guide 30, etc. are inserted. For this reason,
The lower end 4b of the front lid 4 is located at a considerably higher position than the height _H1 of the tape drawer guide 29, the inclined guide 30, etc., and the lower end 4b of the front lid 4 is pushed up relatively by the lid opening member 27. When opening the front cover 4, the downward stroke of the tape cassette is H ₂
height is required. Therefore, this downward stroke _H2 causes the tape pull-out guide 29 and the inclined guide 3 to
There was a problem that the height H ₁ of 0 etc. became larger than necessary. Since the downward stroke of the tape cassette becomes large, there is a problem in that the video tape recorder body becomes thicker.

In addition, when the lower end 4b of the front lid 4 is pushed up by the opening member 27 to open the front lid 4, the tape 8 stretched along the front opening 10 of the cassette case 3 is pushed up by the opening member 27. 27, it is necessary to bring the opening member 27 into contact with the lower end 4b of the front lid 4 on the outside of the tape path. For this reason,
It is necessary to provide a notch 28 at the front end of the bottom of the cassette housing 3 outside the tape path.
There was a problem in that the space outside the tape path could not be used effectively for the locking mechanism, reel locking mechanism, etc.

[Purpose of the invention]

The present invention aims to provide a lid opening device for a cassette loading device that can solve the above-mentioned problems.

[Summary of the invention]

The present invention provides the above-mentioned lid opening device for the cassette loading device, in which when the tape cassette is loaded from the cassette insertion position to the cassette loading position, the lower end of the rear lid is pushed up relatively, and the rear lid and the front lid are opened. The position and shape of the lid opening member in the cassette mounting device are set so that the lid opening member is rotated from the closing position to the opening position in conjunction with each other to open the lid. The downward stroke when the tape cassette is installed in the cassette installation position can be significantly reduced, and the entire device can be made thinner. Furthermore, the space outside the tape path within the cassette housing can be effectively used for the lid, reel locking mechanism, and the like.

〔Example〕

An embodiment in which the present invention is applied to a lid opening device for a cassette loading device in a cassette type video tape recorder will be described below with reference to FIGS. 5 and 6. The tape cassette used has the same structure as that shown in FIGS. 1 and 2, so the same reference numerals are given and the explanation thereof will be omitted.

First, as shown in FIG. 5, the tape cassette is moved from the cassette insertion position indicated by the two-dot chain line to the position indicated by the one-dot chain line in the direction of arrow e by the cassette attachment mechanism (not shown) of the cassette attachment device 32. is pulled in horizontally. Thereafter, the tape cassette is vertically lowered in the direction of arrow f and is mounted to the cassette mounting position shown by the solid line.

At the cassette mounting position of the cassette mounting device 32, a nearly elongated plate-shaped opening member 33 is disposed vertically. When the tape cassette passes above the tape pull-out guide 29, the inclined guide 30, etc. and reaches the position indicated by the dashed line, the upper end 33a of the opening member 33 is connected to the lower end of the rear lid 5. 5b. Further, as shown in FIG. 6, the opening member 33 is located at the center portion of the rear lid 5 in the left-right direction, and is located at the lower end 5b of the rear lid 5.
It is located so that it is located at

According to the openable member 33 whose position and shape are set in this way, the lower end 5b of the rear cover 5 is aligned with the upper end 33 of the openable member 33 immediately after the tape cassette starts vertically descending.
The lower end 5 of the rear cover 5 is brought into contact with
b is relatively pushed up by the upper end 33a of the closing lid member 33. As a result, the rear cover 5 and the front cover 4 are interlocked with each other, and the cassette housing 3 is opened from the closed position.
The lid is opened by being rotated in the direction of arrow a' to the upper lid opening position. When the rear cover 5 and the front cover 4 are opened and the tape cassette is installed in the cassette mounting position, the tape drawer guide 29, inclined guide 30, etc. on the video tape recorder side are moved to the rear of the front opening 10 of the cassette housing 3. It is inserted relatively into a recess 12 provided on the side.

According to the lid opening device of the cassette loading device as described above, the lower end 5b of the rear lid 5 is pushed up relatively by the lid opening member 33 when the tape cassette is vertically lowered. , the height of the lid opening member 33 can be lowered. That is, when the front cover 4 and the rear cover 5 are rotated from the closed position to the open position in conjunction with each other, the rear cover 5 is positioned below the front cover 4 at the upper part of the cassette housing 3. . Therefore, the lower end 5b of the rear lid 5 is located close to the height _H1 of the tape pull-out guide 29, the inclined guide 30, etc., and is in contact with the lower end 5b of the rear lid 5 at this position. The height of the set opening member 33 can be reduced. Therefore, this opening member 33
Therefore, when the lower end 5b of the rear cover 5 is pushed up relatively, the downward stroke of the tape cassette becomes _H3 , compared to the downward stroke _H2 (Fig. 3) when the lower end 4b of the front cover 4 is pushed up relatively. This downward stroke _H3 can be made significantly smaller, and the height of the tape pull-out guide 29, inclined guide 30, etc.
It only needs to be the minimum necessary size larger than H ₁ . As a result,
The downward stroke of the tape cassette can be determined by the heights of the tape pull-out guide 29, the inclined guide 30, etc. without making it unnecessarily large.

Moreover, since the lower end 5b of the rear cover 5 of the tape path extending along the front opening 10 of the cassette housing 3 is pushed up relatively by the opening member 33, the opening of the rear lid 5 of the tape path is extended to the cassette housing 3 on the outside of the tape path. Member 33
There is no need to provide a cutout for insertion. Therefore, the space outside the tape path within the cassette housing 3 can be effectively used for the lid locking mechanism, reel locking mechanism, and the like.

Furthermore, since the lower end 5b of the rear lid 5 is pushed up at the center in the left-right direction of the rear lid 5, the front lid 4 and the rear lid 5 There is no twisting at all, and the full cover 4 and rear cover 5 can be rotated and opened extremely smoothly.

Although one embodiment of the present invention has been described above, various effective modifications can be made based on the technical idea of the present invention.

[Application example]

The present invention is not limited to a lid opening device for a cassette loading device in a video tape recorder;
It can be applied to a lid opening device for a cassette loading device in various other recording/reproducing devices and information processing devices.

〔Effect of the invention〕

As described above, when the tape cassette is installed from the cassette insertion position to the cassette mounting position, the lower end of the rear lid is relatively pushed up by the opening member to separate the rear lid and the front lid. Since the lid is opened by rotating the lid from the closed position to the open position in conjunction with each other, when the front lid and rear lid are opened, the lower end of the rear lid is positioned below the front lid. By pushing up the lid opening member, the lid opening member can be lowered. Therefore, the downward stroke when the tape cassette is installed in the cassette installation position can be significantly reduced, and the entire device can be made thinner.

In addition, since the rear cover that covers the rear side of the tape stretched along the front opening of the cassette housing is pushed up relatively by the opening member, the opening member does not attach to the cassette housing outside of the tape path. There is no need to provide a switching section for inserting the tape, and the space outside the tape path within the cassette housing can be effectively used for the lid, reel lock mechanism, etc.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a tape cassette used in the present invention, and FIG. 2 is a longitudinal sectional side view of the main parts of the same. 3 and 4 show a conventional example of a lid opening device for a cassette loading device in a video tape recorder, in which FIG. 3 is a longitudinal cross-sectional side view of the main part, and FIG. It is a notch top view. 5 and 6 show an embodiment in which the present invention is applied to a lid opening device for a cassette loading device in a video tape recorder. is a partially cutaway plan view of the main part. In addition, in the symbols used in the drawings, 3...cassette housing, 4...front cover, 4b...lower end, 5...
Rear lid, 5b... lower end, 8... tape, 10... front opening, 12... recess, 32... cassette mounting device, 33... lid opening member, 33a... upper end.

Claims (1)

[Claims] 1. A front lid rotatably attached to the cassette casing to cover the front side of the tape stretched along the front opening provided in the cassette casing, and a front cover that covers the rear side of the tape stretched along the front opening provided in the cassette casing. A tape cassette having a rear lid rotatably attached to the front lid to cover the tape is used, and when the tape cassette is installed from the cassette insertion position to the cassette mounting position, the lower end of the front lid is relatively It is provided at the cassette mounting position so that the front cover and the rear cover can be pushed up to interlock with each other and rotated from a closed position on the front and rear surfaces of the tape to an open position on the upper part of the cassette case to open the lid. When the tape cassette is installed from the cassette insertion position to the cassette installation position, the lid opening member of the cassette loading device relatively pushes up the lower end of the rear lid and connects the rear lid and the front lid. The opening of the cassette loading device is characterized in that the position and shape of the front lid member at the cassette loading position are set so that the front lid member is rotated from the closed lid position to the opened lid position in conjunction with each other to open the lid. Lid device.