JPH0329806Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a cassette attachment/detachment device that is most suitable for application to, for example, a front-loading type video tape recorder. The cassette is reciprocated between the cassette insertion position and the cassette installation position along a locus of movement in which the cassette is pulled horizontally backward and then vertically lowered to the cassette installation position, thereby attaching and removing the cassette to and from the cassette installation position. However, when the cassette holder is moved back from the cassette mounting position to the cassette insertion position and passes along the above-mentioned movement trajectory, the cassette holder's returning force is used to
A cassette ejecting lever rotatably provided at the rear end of the cassette holder is rotated so that the cassette ejecting lever pushes the cassette in the cassette holder, and as the cassette holder moves back to the cassette insertion position, the cassette is removed. The present invention relates to a cassette attachment/detachment device configured to push the cassette out of the holder.

[Conventional technology]

A conventional example of a cassette attachment/detachment device for this type of front loading type video tape recorder will be explained with reference to FIGS. 4 to 6C.

First, this cassette attachment/detachment device is capable of selectively attaching and detaching cassettes 1 and 2 of different sizes.

This cassette attachment/detachment device is constructed and operated as follows.

First, as shown in FIGS. 4 and 5, a pair of support plates 6 arranged perpendicularly on the chassis 5 on both the left and right sides of the cassette holder 4 have three inverted L-shaped plates bent at a substantially right angle. Guide grooves 7 are provided, and three guide rollers 8 rotatably pivoted to both left and right side plates 4a of the cassette holder 4 are loosely fitted into the three guide grooves 7, and the cassette holder 4 is guided by the guide grooves 7. At the same time, a cassette holder reciprocating drive mechanism (none of which is shown) driven by a motor drives the cassette holder 4 to move the cassette holder 4 from the cassette insertion position shown by solid lines in FIGS. After horizontally retracting the cassette to the rear, the cassette is lowered vertically to the cassette installation position shown by the dashed line in Figs. It is configured to be able to freely reciprocate.

Then, the large and small cassettes 1 or 2 are selectively inserted horizontally from the direction of arrow c as shown in Figs. Thereafter, by moving the cassette holder 4 forward in the direction of arrow a along the above-mentioned movement locus, the large and small cassettes 1 and 2 are selectively mounted to the cassette mounting position. Also, by moving the cassette holder 4 back in the direction of arrow b along the above-mentioned movement locus,
The large and small cassette 1 or 2 is ejected to the cassette insertion position, and at this time, the rear end 1a or 2a of the large and small cassette 1 or 2 is moved out of the cassette insertion slot 10 into the first and second cassettes.
It is configured to protrude in the direction of arrow d in the figure.

Next, as shown in FIGS. 5 and 6A, a pair of cassette ejecting levers 12 are rotatably attached to both left and right ends of the bottom plate 4b of the cassette holder 4 at the lower part of the rear end side thereof via a pair of fulcrum pins 13. At the same time, both of the cassette ejecting levers 12 are moved in the direction indicated by the arrow e in FIGS. 5 and 6A by a pair of tension springs 14.
A pair of protrusions 15 are formed on the inside of both support plates 6 on the horizontal path of the approximately L-shaped movement locus.
4 and 5, when the small cassette 2 is horizontally inserted into the cassette holder 4 from the cassette insertion opening 10 in the direction of arrow c, both cassettes are pushed out by the front end 2b of the small cassette 2. By pushing the cassette ejecting pin 16 installed on one end 12a of the lever 12, the two cassette ejecting levers 12 are moved from the return position shown by the dotted line in FIGS. 5 and 6A to the dotted line shown in FIGS. 5 and 6A. The small cassette 2 is rotated in the direction of arrow f against both springs 14 to the forward movement position shown, and then the cassette holder 4 is moved forward in the direction of arrow a along the above-mentioned movement locus.
When the small cassette 2 is ejected to the cassette insertion position by moving the cassette holder 4 backward in the direction of arrow b along the above-mentioned movement trajectory, the cassette holder 4 moves along the horizontal path of the above-mentioned movement trajectory. When passing horizontally in the direction of arrow b in FIGS. 4 and 5, the other ends 12b of both cassette push-out levers 12 are brought into contact with both protrusions 15 as shown in FIG. 6B, and the cassette holder 4 at that time is Using the return force in the direction of arrow b, push out both cassette levers 1.
2 around both fulcrum pins 13 from the forward movement position to the return movement position in the direction of arrow e,
The small cassette 2 is pushed in the direction of the arrow b in FIGS. 4, 5, and 6B using the two cassette push-out pins 16 on one end 12a of the two cassette push-out levers 12, and as the cassette holder 4 moves back to the cassette insertion position, the small cassette is pushed out. The rear end 2a of the cassette 2 is horizontally pushed out of the cassette insertion opening 10 by an amount A in the direction of the arrow d, as shown by the dotted line in FIGS. In the figure, 17 is a cassette positioning stopper provided on the rear end of the bottom plate 4b of the cassette holder 4, and 18 is a pair of circular arcs for rotating both cassette push-out pins 16 provided on the bottom plate 4b. It's a groove.

The cassette attachment/detachment device configured and operated as described above is such that when the small cassette 2 is ejected from the cassette mounting position to the cassette insertion position, the rear end 2a of the small cassette 2 is pinched by hand from outside the front panel 9. In order to be able to pull out the small cassette 2 from inside the cassette holder 4 to outside the cassette insertion slot 10 in the direction of arrow d, when ejecting the small cassette 2,
Push out the small cassette 2 using both cassette push levers 12, and insert the rear end 2a into the cassette insertion slot 10.
The structure is such that the extrusion amount A is extruded outward as shown by the dotted line in FIGS. 4 and 5.

Since the large cassette 1 is larger than the small cassette 2, when the large cassette 1 is ejected from the cassette mounting position to the cassette insertion position,
The rear end portion 1a necessarily protrudes out of the cassette insertion slot 10 by a large protrusion amount B, as shown by the dashed line in FIGS. Therefore, there is no need for the large cassette 1 to be pushed out by the two cassette pushing levers 12 as described above. For this purpose, the front end 1b of the large cassette 1 shown in FIG. Sometimes the rear end 1
The cassette ejecting levers 12 are configured to remain in the position shown by the dashed line in FIG. 5 without pushing the cassette ejecting pins 16 at step b.

[Problem that the invention attempts to solve]

However, in this conventional example, when the cassette holder 4 is moved forward in the direction of the arrow a, and when the cassette holder 4 passes horizontally on the horizontal path of the above-mentioned movement locus in the direction of the arrow b in FIGS. , as shown in FIG. 6C, the other end 1 of both cassette ejecting levers 12
2b comes into contact with both protrusions 15, and both cassette ejecting levers 12 are further rotated further from the forward movement position in the direction of arrow f toward the rear side of the cassette holder 4 against both springs 14. One end 12a of the cassette ejection lever 12 and both cassette ejection pins 16
is ejected to the rear side of the cassette holder 4 by a large ejection amount C.

However, in this way, when the cassette holder 4 moves forward in the direction of arrow a, both cassette ejection levers 12
When the one end 12a and the cassette ejecting pin 16 protrude far to the rear side of the cassette holder 4, these cassette ejecting levers are forced into various other mechanical parts such as a tape guide and a tape sensor arranged at the rear side of the cassette holder 4. There is a risk that one end 12a of the cassette 12 and the cassette ejecting pin 16 may cause interference such as collision. In order to avoid this interference, extra space must be provided at the rear of the cassette holder 4, which not only worsens the space factor, but also increases the length of the video tape recorder from front to back, making it larger. This may cause problems such as loss of freedom in design.

The present invention provides a cassette attachment/detachment device of this type.
When the cassette holder is moved from the cassette insertion position to the cassette mounting position, and when the other end of the cassette ejection lever abuts and passes the protrusion of the support plate,
It is possible to prevent one end of the cassette ejecting lever from rotating toward the rear side of the cassette holder and jumping out greatly.

[Means for solving problems]

The present invention provides the cassette attachment/detachment device shown in the conventional example, in which one end of the cassette ejecting lever, which has been rotated from the backward movement position to the forward movement position by the cassette inserted into the cassette holder, prevents the cassette from moving beyond The cassette holder is provided with a first stopper for restricting the holder from being rotated to the rear side, and the protrusion is configured as a rotary lever rotatably attached to the support plate, and the rotary lever is The cassette holder is configured to be rotatable in the forward and backward directions on the horizontal path of the movement locus, and the rotating lever is biased to rotate in the backward direction of the cassette holder. A rotation urging spring that causes the tip of the movable lever to protrude inside the support plate, and a second stopper that limits the amount of rotation of the rotary lever in the backward movement direction by the spring are provided on the support plate side. When the cassette holder is moved forward from the cassette insertion position to the cassette mounting position and the other end of the cassette ejecting lever abuts and passes the tip of the rotary lever, the first stopper is activated. The cassette ejecting lever is held in the forward movement position by rotation restriction, and the rotating lever side is rotated in the forward movement direction of the cassette holder against the spring to release the cassette ejection lever. This is a cassette attachment/detachment device characterized by the following.

[Effect]

In this invention, when the cassette holder is moved forward from the cassette insertion position to the cassette attachment position, and when the other end of the cassette ejection lever abuts and passes the protrusion of the support plate, the cassette ejection lever is moved to the forward movement position. Since the rotating lever side is released against the spring while being held, one end of the cassette ejecting lever does not rotate further from the forward position to the rear side of the cassette holder and protrude significantly.

〔Example〕

An embodiment in which the present invention is applied to a cassette attachment/detachment device for a front-loading type video tape recorder will be described below with reference to FIGS. 1 to 3E. Note that the same structural parts as those of the conventional example shown in FIGS. 4 to 6C are given the same reference numerals, and the explanation thereof will be omitted.

First, as shown in FIGS. 1 and 3A, both the cassette ejecting levers 12 are moved between the backward movement position on the front side of the cassette holder 4 shown by the dashed line and the forward movement position on the rearmost side shown by the dotted line. It is configured to be rotatable in the directions of arrows e and f around the fulcrum pin 13 between the moving position and the moving position.

Therefore, in the present invention, a pair of left and right first stoppers 20 are provided at the lower part of the rear end of the bottom plate 4b of the cassette holder 4, and both cassette ejecting levers 12 move in the direction of the arrow f from the backward movement position to the forward movement position. When rotated, both cassette ejecting levers 12 are brought into contact with both first stoppers 20, and one end 12a of both cassette ejecting levers 12 is moved further to the rear side of the cassette holder 4 (in the direction of arrow f). It restricts rotation.

Next, in the present invention, as shown in FIGS. 1 to 3A, the pair of left and right protrusions 15 of the conventional example are configured into a pair of left and right rotating levers 21 rotatably attached to the pair of left and right support plates 6. are doing. That is, both rotating levers 21 are configured to be rotatable via a pair of fulcrum pins 23 perpendicular to a pair of mounting plates 22 fixed to the outside of both supporting plates 6. The rotating directions of both rotating levers 21 are the forward direction (direction of arrow a) on the horizontal path of the almost inverted L-shaped movement locus of the cassette holder 4, and the backward direction (direction of arrow g). b direction) and arrow h direction. Both rotating levers 21 are urged to rotate in the direction of the arrow h, which is the backward movement direction, by a pair of springs 24 made of torsion coil springs, so that the tips 21a of both rotating levers 21 It is configured to protrude inside both support plates 6 from a pair of window holes 25 provided in the support plates 6 . As shown in FIG. 3A, when both rotating levers 21 are rotated in the direction of the arrow h and their tips 21a protrude inside both supporting plates 6, the other ends 21b of both rotating levers 21 are rotated in the direction of the arrow h. A second stopper 26 integrally provided on the plate 22
It is configured such that it is in contact with the holder and further rotation in the direction of the arrow h is restricted. In addition, both rotating levers 2 are attached to the other end 12b of both cassette ejecting levers 12.
A pair of rollers 27 are rotatably mounted to reduce the load upon contact with the roller 1.

Next, the operation of the cassette attachment/detachment device of the present invention constructed as described above will be described with respect to the small cassette 2.

First, as shown by solid lines in Figures 1 and 3A, the small cassette 2 is inserted into the cassette holder 4 from the cassette insertion slot 10.
When the small cassette 2 is inserted horizontally from the direction of arrow c, the front end 2b of the small cassette 2 comes into contact with and pushes the cassette ejecting pins 16 of the cassette ejecting levers 12. 14
It is rotated in the direction of arrow f against the forward movement position indicated by the dotted line. The rotated cassette ejection levers 12 come into contact with the first stoppers 20.

Next, after inserting the small cassette 2, as described above, the cassette holder 4 is moved forward in the direction of the arrow a in FIGS. mounted in position.

At this time, when the cassette holder 4 passes horizontally on the horizontal path of the movement locus in the direction of the arrow a in FIGS. 27 comes into contact with the tips 21a of both rotating levers 21 and passes through.

However, when levering both cassettes,
2 is in contact with both first stoppers 20 and cannot rotate any further in the direction of arrow f.
For this reason, both rotating levers 21 are rotated in the direction of arrow g, which is the forward movement direction, against both springs 24 and released.

Therefore, while holding both cassette ejecting levers 12 in the forward movement position, both rotating levers 21 are released against both springs 24, so that one end 12a of both cassette ejecting levers 12 moves forward as shown in FIG. 3B. There is no possibility that the cassette holder 4 will rotate further to the rear (in the direction of arrow f) from the position and fly out.

As shown in FIG. 3C, after both cassette ejecting levers 12 have passed in the direction of arrow a, both rotating levers 21 are moved back in the direction of arrow h by both springs 24, and the other end 21b is moved again. It is brought into contact with the second stopper 26.

Next, as described above, the small cassette 2 is ejected to the cassette insertion position by moving the cassette holder 2 back along the movement trajectory in the direction of the arrow b in FIG.

At this time, when the cassette holder 4 passes horizontally on the horizontal path of the movement locus in the direction of the arrow b in FIG. Double rotating lever 2
1 and passes through.

However, when levering both cassettes,
2 is rotated in the direction of arrow e from the forward movement position in FIG. 3D to the backward movement position in FIG. As the cassette holder 4 moves back to the insertion position, the rear end 2a of the small cassette 2 is horizontally pushed out of the cassette insertion slot 10 by an amount D in the direction of the arrow d as shown by the dotted line in FIG.

Note that the other end 12b of both cassette push-out levers 12
Both rollers 27 which are pivotally connected to both rotation levers 2
The load when the small cassette 2 comes into contact with and passes through the cassette 1 is reduced, and the small cassette 2 can be pushed out smoothly by rotating both cassette pushing levers 12 in the direction of the arrow e.

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

The present invention is not limited to a cassette attachment/detachment device for a video tape recorder, but can be applied to a cassette attachment/detachment device of various cassette type recording/reproducing devices and information processing devices.

[Effect of idea]

In this invention, when the cassette holder is moved from the cassette insertion position to the cassette mounting position, and when the other end of the cassette ejection lever comes into contact with and passes the protrusion of the support plate, one end of the cassette ejection lever is moved from the cassette holder to the cassette holder. This is to prevent the cassette eject lever from pivoting to the rear side of the cassette holder and causing the cassette to pop out significantly. There is no risk that these will be damaged due to collision or other interference. In addition, there is no need to provide extra space at the rear of the cassette holder to avoid interference, resulting in a very good space factor, and the recording/reproducing device can be made smaller by shortening its front-rear length. The degree of freedom in design is significantly increased.

[Brief explanation of drawings]

Figures 1 to 3E show an embodiment in which the present invention is applied to a cassette attaching/detaching device for a front-loading type video tape recorder.
FIG. 1 is a horizontal cross-sectional plan view, FIG. 2 is a perspective view of the main parts, and FIGS. 3A to 3E are plan views illustrating the operation of the main parts. 4 to 6C show a conventional example, in which FIG. 4 is a side view in a vertical section, FIG. 5 is a plan view in a horizontal section, and FIGS. 6A to 6C are main parts. FIG. 3 is a plan view illustrating the operation. In the symbols used in the drawings, 2...Small cassette, 4...Cassette holder, 6...Support plate, 7
...Guide groove, 8...Guide roller, 10...Cassette insertion slot, 12...Cassette ejection lever, 1
2a... One end of the cassette ejection lever, 12b...
The other end of the cassette ejection lever, 13...fulcrum pin,
14... Spring, 16... Cassette ejector pin, 20
...First stopper, 21...Rotating lever, 2
1a... the tip of the rotating lever, 26... the second stopper.

Claims (1)

[Scope of utility model registration request] A pair of support plates arranged vertically on the left and right sides of the cassette holder are provided with guide grooves bent at almost right angles, and the cassette holder is guided by these guide grooves to move the cassette holder backward from the cassette insertion position. The cassette holder is configured to be capable of reciprocating along a locus of movement in which the cassette is pulled in horizontally and then lowered vertically to the cassette mounting position, and the cassette is attached to and removed from the cassette mounting position by reciprocating the cassette holder along the locus of movement. At least one cassette ejecting lever is rotatably provided on the rear side of the cassette holder, and a protrusion is provided on the inside of the at least one support plate on the horizontal path of the movement locus, so that the cassette ejection lever is inserted into the cassette holder. The cassette is used to push one end of the cassette eject lever to move the cassette eject lever from a backward position at the front side of the cassette holder to a forward position at the rear end of the cassette holder, and the cassette holder is moved from the cassette mounting position. When the cassette is moved back to the forward movement position, the other end of the cassette ejection lever is brought into contact with the protrusion as it passes along the horizontal path of the movement locus, and the cassette ejection lever is moved from the forward movement position to the return movement. A cassette attachment/detachment device configured to push the cassette in the cassette holder with one end of the cassette ejection lever and push the cassette out of the cassette holder as the cassette holder moves back to the cassette insertion position. , restricting one end of the cassette ejecting lever, which has been rotated from the backward movement position to the forward movement position by the cassette inserted into the cassette holder, from being rotated any further toward the rear side of the cassette holder. A first stopper is provided on the cassette holder, the protrusion is configured as a rotary lever rotatably attached to the support plate, and the rotary lever is moved along the horizontal path of the movement locus of the cassette holder. The rotating lever is rotatably biased in the forward and backward directions of the cassette holder, and the tip of the rotating lever projects inside the support plate. A spring for urging the rotation and a second stopper for limiting the amount of rotation of the rotation lever in the backward movement direction by the spring are provided on the support plate side, and the cassette holder moves from the cassette insertion position to the cassette insertion position. When the cassette ejecting lever is moved forward to the loading position, when the other end of the cassette ejecting lever comes into contact with the tip of the rotary lever and passes through, the first stopper restricts the rotation of the cassette ejecting lever. A cassette attaching/detaching device characterized in that, while the cassette is held in the forward movement position, the rotating lever side is rotated in the forward movement direction of the cassette holder against the spring to release the cassette holder.