JP3163855B2 - Cassette loading device for recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading device for a recording / reproducing apparatus which enables two or more kinds of cassettes having different sizes to be used by one mechanical mechanism.

[0002]

2. Description of the Related Art A conventional example of a cassette insertion mechanism of a cassette loading device which can use cassettes having different sizes will be described with reference to FIGS. For simplicity, a description will be given here of a cassette insertion device that can use two types of cassettes, large and small.

In FIG. 11, reference numeral 41 denotes a mechanical chassis, reference numeral 42 denotes a cassette holder, reference numeral 43 denotes an exterior member having a cassette insertion window 44, reference numeral 45 denotes a cassette compartment door (hereinafter, referred to as a cassette control door), and reference numerals 46a and 46b. A large cassette detection lever, 47a and 47b are stoppers for preventing erroneous insertion of a cassette, and 48 is a stopper drive shaft.

[0004] The cascon door 45 has a flat plate shape in which rotating fulcrum shafts 45a and 45b provided on the upper portion thereof are supported by the cascon frames 49 and 50 and are rotatably supported.
And it is urged | biased in the direction which closes from the arrow a direction by the spring 51 provided in the rotation fulcrum shaft 45a.

A pair of large cassette detection levers 46a and 46b are symmetrically arranged on the left and right sides, and are supported so as to be rotatable with respect to a rotation center shaft 52. Are biased inward. The large cassette detection levers 46a, 46
In the normal state, as shown in FIG. 12 , b protrudes inside the range of the cassette insertion window 44, and when the large cassette 53 is inserted, it is pushed by the front end of the cassette and escapes in the direction opposite to the arrow b direction. It has become.

When the large cassette detection levers 46a and 46b are pressed, the erroneous insertion prevention stoppers 47a and 47b are rotated via the stopper drive shaft 48 connected thereto.
Each of them escapes in the direction of the arrow c around the center 2. Here, one large cassette detection lever 46a is connected to and operatively connected to the erroneous insertion prevention stopper 47b, and conversely, the other large cassette detection lever 46b is connected to and operatively connected to the erroneous insertion prevention stopper 47a. ing.

FIG. 12 shows a case where the large cassette 53 is inserted.
With reference to FIG. 7, the cassette is inserted into the cassette insertion window 44 of the exterior member 43 while adjusting the position of the cassette. When the insertion is started, first, the large cassette detection levers 46a, 46b are pushed back in the direction opposite to the direction of the arrow b, and the erroneous insertion prevention stoppers 47a, 47b, which are interlocked with this operation, are both pivoted in the direction of the arrow c. The cassette escapes downward with the shaft 52 as a center, and the cassette tip is pushed open the cassette door 45 and inserted. Thereafter, the large cassette 53 enters the standby cassette holder 42, is carried to a predetermined position together with the cassette holder 42, and enters a tape loading state in which recording and reproduction can be performed.

On the other hand, when the small cassette 54 is inserted, the operation will be described with reference to FIG. 12. Referring to FIG. 12, the large cassette detecting levers 46a and 46b arranged at both ends inside the cassette insertion window 44 of the exterior member 43 are moved right and left of the cassette. Insert between them as a guide. This enables the large cassette detection lever 4
6a and 46b do not move, only the cassette door 45 is pushed open, and the small cassette 54 enters the waiting cassette holder 42, is transported together with the cassette holder 42 to a prescribed position, and has a recordable / reproducible tape. It becomes loading state.

FIG. 13 shows a case where the small cassette 54 is inserted while being shifted to a place other than between the two large cassette detection levers 46a and 46b. In this case, for example, the large cassette detection lever 46a on the side where the small cassette 54 is shifted is pushed down by the cassette. In this state, the large cassette detection lever 4 on the opposite side
6b is not pushed, so that the erroneous insertion prevention stopper 47a associated therewith does not move.

Therefore, even if the small cassette 54 is to be inserted, since the erroneous insertion prevention stopper 47a is in a protruding state at that position, the cassette is caught by the erroneous insertion prevention stopper 47a at this position so that further insertion is not possible. . As a result, it is known that the cassette has been inserted at the wrong position where the cassette has been inserted, and the cassette is inserted again at the correct position. Further, when the small cassette 54 is inserted while being shifted in the opposite direction to the above case, the insertion is similarly prohibited by the wrong insertion prevention stopper opposite to the above case. Therefore, the small cassette has a structure that allows insertion only at the center regular cassette insertion position.

A conventional cassette loading mechanism which is different from the above-described cassette loading device and in which a cassette having a different size can be inserted is intended to regulate the left and right positions of a small cassette by providing a groove on the cassette side. There is.

FIG. 14 shows an example in which a groove is formed on the bottom surface of a large cassette on the outside of the outer shape of a small cassette. In this case, a pair of parallel projections 55a, 55b is provided on the inner bottom surface of the cassette holder 42 into which the cassette is inserted.
Are provided to guide the outside of the small cassette 54. When a large cassette 53 is inserted, grooves 56a and 56b are provided on the lower surface of the cassette 53 so as to escape the projections 55a and 55b, so that the cassette 53 can be inserted as usual.

Another example is shown in FIG. This is provided with a groove portion 57 at the center of the cassette bottom surface so as to be common to the large cassette 53 and the small cassette 54. In this case, a projection 58 is provided at the center of the inner bottom surface of the cassette holder 42, and all cassettes are positioned at the center of the cassette holder 42 using the projection 58 as a guide.

[0014]

However, FIG.
In the cassette loading device in the case of (1), when the insertion position of the small cassette 54 is specified and the misalignment is prevented by using the large cassette detection levers 46a and 46b and the left and right positions are restricted when the small cassette 54 is inserted, the cassette loading device must It is necessary to dispose the large cassette detection levers 46a and 46b in front of the door 45, so that there is a sense of incongruity in design as compared with a cassette insertion window portion of a conventional VTR (VHS or the like), and there are great restrictions on design and There was a problem that there was a feeling of strangeness in use.

When the small cassette is inserted, the left and right guides are moved by the large cassette detection levers 46a and 46b.
, The shape of this portion needs to have a certain depth or more, and for this reason, the cassette door 45 has to be disposed considerably behind the exterior member 43. This design has a great sense of incongruity and restrictions.

Also, the large cassette detecting levers 46a, 46
After b, it is necessary to dispose erroneous insertion prevention stoppers 47a and 47b used when the small cassette 54 is shifted and inserted. For this reason, a space is required between the cassette insertion window 44 portion of the exterior member 43 and the cassette holder 42 standing by at the back, so that when the size difference between the small cassette and the large cassette is large, the length of the cassette holder 42 is long. In addition, the design constraints such as the size cannot be increased.

Further, the large cassette detection levers 46a, 46
6b has a shape that protrudes forward from the cassette insertion window 44, so that it may be easily touched by mischief or a method of use, may cause malfunction, and may have a complicated structure and a reduced number of parts. There is a problem that the number increases.

On the other hand, in the cassette loading device shown in FIGS. 14 and 15, when a groove is formed on the lower surface of the cassette as in the embodiment, the degree of freedom in the shape of the cassette is lost and the design and the function are reduced. This will impose constraints. For example,
When a groove is provided in a large cassette, there is a restriction that the thickness of the bottom of the cassette needs to be large enough to match the depth of the groove.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is possible to eliminate a feeling of inconsistency and restrictions in design and use of a cassette insertion window portion and to cause restrictions in design. It is an object of the present invention to obtain a cassette loading device of a recording / reproducing device without any.

[0020]

In order to achieve the above-mentioned object, a cassette loading device for a recording / reproducing apparatus according to the present invention comprises:
In a cassette loading apparatus having a cassette holder for moving one of cassettes of two or more types of recording media having different sizes from an insertion position to a cassette loading position, and a moving mechanism for moving the cassette holder, Of the different cassettes, a cassette insertion door having a step in the cassette insertion direction is provided at both ends in the width direction of the position where the small cassette is to be inserted, and the cassette insertion opening is provided depending on the size of the cassette to be inserted. A limiter for limiting the amount of rotation of the door, wherein the amount of rotation of the door is switched between a first state and a second state in which the amount of rotation is larger than the first state in accordance with the movement of the limiter; The small cassette is positioned by the step.

[0021]

In the cassette loading device of the recording / reproducing apparatus according to the present invention having the above-described structure, the door is opened when the small cassette is positioned by being guided by the step provided on the door of the cassette insertion opening, and the cassette is inserted into the cassette holder. Can be mounted.

When cassettes of different sizes are inserted, the door of the cassette insertion opening is switched by the restricting means between the first rotation amount and the second rotation amount larger than the first rotation amount. Thus, cassettes of different sizes can be inserted.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cassette loading device according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a cassette component (hereinafter, referred to as a cassette) of a VTR provided with the cassette loading device of the present embodiment, FIG. 2 is a cross-sectional view of a main part of the cassette loading device, and FIG. 3 is an exploded perspective view of the cassette loading device. 4 to 6 are cross-sectional views of a main part of the cassette loading device, in which cassettes having different sizes are loaded.

Referring to FIGS. 1 to 3, first, the general components of the cassette loading device will be described. Reference numeral 1 denotes a cassette chassis mechanical chassis, 2 denotes an exterior member having a cassette insertion window 3, and 4 denotes an exterior member. Kasekon door behind,
5 is a cassette holder, 6a and 6b are cassette frames,
Reference numerals 7a and 7b denote driving sliders provided outside the cassette frames 6a and 6b. Guides, not shown, of the cassette holder 5 formed in the guide grooves 7a 'and 7b' of the driving sliders 7a and 7b in the cassette frames 6a and 6b. Groove 6
a ', 6b'. Reference numeral 8 denotes a drive shaft having drive gears 8a and 8b that mesh with the drive sliders 7a and 7b, 9 denotes a reduction gear that meshes via a gear 8c provided on the drive shaft 8, and 10 denotes a motor as a drive source.

More specifically, when the cassette is inserted through the cassette insertion window 3 of the exterior member 2 and further inserted into the cassette holder 5 by pushing the cassette cover 4 open, the motor 10 is driven and the reduction gear 9 and the driving gears 8a, 8a, 8b, the cassette holder 5 is moved along the guide grooves 6a ', 6b' of the cassette frames 6a, 6b via the drive sliders 7a, 7b.
Is driven to the cassette loading position.

Next, a description will be given of a cassette loading device which is a main part of the present invention. The cascon control door 4 is provided with cascon control frames 6a, 6b by supporting shafts 11a, 11b provided at lower portions on both ends.
Is rotatably supported. The cassette door 4 is urged in the closing direction by a torsion coil spring 12 provided on the other support shaft 11b, and is opened when a cassette is inserted.

Here, the cascon door 4 has thick portions 4a and 4b on both sides thereof, while a thin portion 4d whose front portion is lower than the step portions 4c and 4c in the central portion. The width between the steps 4c, 4c corresponds to the width of the small cassette.

Thick portions 4a, 4b of cascon door 4 described above
The large cassette detection doors 13a and 13b are provided on the outer side of the thick cassettes 4a and 4b as divided doors in which the thick portions 4a and 4b are divided. These large cassette detection doors 13a, 13b
Are rotatably supported by support portions of a cascon top plate (not shown) with support shafts 14a and 14b provided at upper ends thereof, and are urged in the closing direction by springs 15a and 15b, respectively.

Also, the large cassette detection doors 13a, 13b are attached to the support shafts 14a, 14b of the large cassette detection doors 13a, 13b.
Actuators 16a and 16b are provided for pushing door stopper drive links 17 and 18 formed of a link mechanism when opening 3b.

The door stopper drive links 17 and 18 are combined in an X-shape, and the center shaft 19 is supported by a cascon top plate (not shown). The door stopper drive links 17 and 18 have operating pieces 17a and 17b at their respective ends.
18a and 18b are formed by bending, and the above-described operating portion 1 is formed.
Door stopper drive links 17, 18 behind 6a, 16b
Correspond to the operating pieces 17a and 18b. Therefore, the operating pieces 17a, 18 are operated by the rotation of the operating portions 16a, 16b.
When b is pushed, the door stopper drive links 17 and 18 rotate around the central axis 19 in the direction in which the X-shaped state closes.

Door stoppers 20, 21 serving as limiting means are disposed in front of the operating pieces 17b, 18a of the door stopper drive links 17, 18. This door stopper 2
Numerals 0 and 21 are rotatable about fulcrum shafts 20a and 21a, and the door stoppers 20 and 21 support the lower ends of the door stoppers 20 and 21 in a state where the upper ends thereof are in contact with the above-described operating pieces 18a and 17b before operation. The pieces 20b and 21b are
Is stopped by the spring member 23 so as to be stopped.

On the other hand, a leaf spring 24 is fixed to the outer surface of the cassette holder 5 by a mounting portion 24a as shown in FIG. The leaf spring 24 is provided with cassette guides 25a and 25b as regulating means provided at both ends thereof.
, And project through the openings 5a and 5b.

The distance between the two cassette guides 25a and 25b is arranged so as to coincide with the width of the small cassette. Therefore, when the small cassette is inserted into the cassette holder 5, the cassette guides 25a and 25b position the small cassette. Is working. When a large cassette is inserted into the cassette holder 5, the cassette guides 25a and 25b
Is pushed up and retracted to the height of the upper surface of the cassette holder 5.

Next, the operation of the cassette loading apparatus thus constructed will be described with reference to FIGS. When the cassette loading device inserts the large cassette 26 from the cassette insertion window 3 of the exterior member 2 in the state shown in FIG. 2, first, the cassette detection door 4 and the large cassette detection doors 13a and 13b are pushed open by the large cassette 26. . At this time, the operating unit 16 that rotates together with the large cassette detection doors 13a and 13b
When the operating pieces 17a, 18b of the door stopper driving links 17, 18 are pressed by the a, 16b, the X-shaped state of the door stopper driving links 17, 18 moves in the closing direction. Door stopper 2
0 and 21 rotate around the fulcrum shafts 20a and 21a,
The auxiliary pieces 20b and 21b of the door stoppers 20 and 21 are separated from the stopper pins 22, and the cassette door 4 is
Release to the maximum position where it abuts. This is shown in FIG.

For this reason, the large cassette 26 is inserted into the cassette holder 5 with its bottom surface sliding on the surfaces of the thick portions 4a and 4b of the cassette door 4. At this time, cassette guides 25a and 25b for the small cassettes are provided in the cassette holder 5.
There is a cassette guide 25
a, 25b are pushed up, and the large cassette 26 is inserted into the cassette holder 5 deep. Then, large cassette 26
At the same time, the cassette holder 5 is transported to a specified position by the drive of the motor 10 as described above, and enters a loading state in which recording and reproduction can be performed.

Here, as shown in FIG.
3a and 13b are provided on the left and right, and the door stopper 2 is interlocked therewith via door stopper drive links 17 and 18.
The two cassettes 0 and 21 are provided on the left and right, so that the cassette door 4 can be opened to an angle through which the large cassette 26 can pass only when both of the large cassette detection doors 13a and 13b are pushed by the large cassette 26. Is available.

Next, when inserting the small cassette 27,
First, the cassette loading device positions the small cassette 27 at the thin portion 4d of the cassette door 4 from the state shown in FIG. 2 and inserts the small cassette 27 so as to fit between the steps 4c. Therefore, the large cassette detection doors 13a and 13b do not operate, and only the cassette control door 4 is pushed open by the small cassette 27. Accordingly, since the large cassette detection doors 13a and 13b do not move, the door stopper drive links 17, 18 and the door stoppers 20, 21 maintain their original positions. At this time, the cassette door 4, the door stopper drive links 17, 18, and the door stoppers 20, 21
FIG. 5 shows the positional relationship between the cassette 27 and the cassette 27.

As shown in FIG. 5, since the door stoppers 20 and 21 are in the non-operation state, the cascon door 4 is not moved.
The rotation angle is restricted by contacting the first auxiliary pieces 20b and 21b. For this reason, when the small cassette 27 is pushed in, both sides of the small cassette 27 are guided by the steps 4 c, 4 c of the cassette door 4, and slide on the thin portion 4 d to be inserted into the cassette holder 5. At this time, the small cassette 27 is inserted into the cassette guides 25a and 25
5b so that the cassette holder 5
Is positioned within. Thereafter, the cassette holder 5 into which the small cassette 27 has been inserted is transported to a prescribed position, and enters a loading state in which recording and reproduction can be performed.

Next, a case where the small cassette 27 is not inserted from the original correct position will be described. When the small cassette 27 is inserted from a state in which 4 opens only the rotation angle range when the small cassette 27 is inserted from the normal position as described with reference to FIG. FIG. 6 shows the positional relationship between the small cassette 27 and the cassette door 4 in this state.

That is, since the bottom surface of the small cassette 27 rides on the thick portion 4a of the cassette door 4, even if the small cassette is to be inserted, the thick portion 4a and the edge of the cassette insertion window 3 of the exterior member 2 are not removed. Can not be inserted any more. Therefore, the small cassette can be correctly inserted only when the small cassette is inserted from the portion located at the thin portion 4d between the step portions 4c, 4c of the cassette door 4, which is the correct position.

As described above, in the cassette loading apparatus according to the present invention, the cassette 4 is provided with the steps 4c, 4c for guiding the insertion of the small cassette 27, and a part of the cassette 4 is divided into large cassettes. Large cassette detection door 1 for detection
3a, 13b, and large cassette detection doors 13a, 13b
The door stoppers 20 and 21 linked to the
The rotation limit angle of the VTR (VHS) can be changed according to the size of the cassette.
), There is less discomfort in design and use compared to the insertion window portion, and design constraints are also reduced.

The mechanism for prohibiting the insertion of the small cassette 27 when the cassette is shifted from the proper position when the cassette is inserted is changed by changing the limit angle of opening of the cassette door 4 for each type of cassette. To do so, it is only necessary to provide door stoppers 20 and 21 that move in accordance with the type of cassette behind the open position of the cassette door 4. For this reason, the positions of the door stoppers 20 and 21 fall within the range in which the cassette-container door 4 can rotate, and the distance between the cassette-container door 4 and the cassette holder 5 can be reduced. There are fewer restrictions on the shapes of design elements.

Further, since the cassette door 4 and the large cassette detection doors 13a and 13b are substantially in the same plane, they are less likely to be touched erroneously, and malfunctions are less likely to occur as compared with the conventional example.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

For example, the vertical relationship between the cassette control door 4 and the large cassette detection doors 13a, 13b is reversed, the support shafts 11a, 11b of the cassette control door 4 are provided on the upper side, and the support shafts of the large cassette detection doors 13a, 13b are provided on the lower side. 14a and 14b may be provided.

The large cassette detecting doors 13a, 13b are not limited to those provided separately in a part of the thick portions 4a, 4b of the cassette door 4, but as shown in FIG. The large cassette detection doors 13a 'and 13b' may be formed over the entire width of the thick portions 4a and 4b.

Further, the shape of the steps 4c, 4c of the cassette door 4 is not limited to a half-moon-shaped convex portion as shown in the embodiment, but is simple as shown in FIG. The flat protrusions 4a 'and 4b' may be provided only at positions corresponding to the width of the small cassette 27 as shown in FIG. The inner surfaces of the projections 4a ", 4b" are stepped portions 4c, 4c through which the small cassette 27 is guided.

Further, the cassette loading device is not limited to only supporting two types of cassettes, large and small, as shown in the embodiment, but can also support three or more types of cassettes.
In this case, it is possible to use a cascon door having three steps.

Further, the cassette guides 25a and 25b of the cassette holder 5 are not limited to being mounted on the upper surface of the cassette holder, but may be mounted on the lower surface of the cassette holder or on both the upper and lower sides.

The cassette loading device according to the present invention
Although the TR has been described as an example, the present invention is widely applicable to cassette loading devices of other recording / reproducing devices.

[0051]

As described above, according to the cassette loading mechanism of the present invention, the cassette insertion mechanism having the steps in the cassette insertion direction at both ends in the width direction at the position where the small cassette is to be inserted among the cassettes having different sizes. A restrictor for restricting the amount of rotation of the door of the cassette insertion slot according to the type of the size of the cassette to be inserted; Is switched to the second state where the rotation amount is larger than the first state, and the positioning of the small cassette is performed by the step portion, so that the following effects can be obtained.

A. Since the step provided on the cassette insertion door serves as a guide when inserting the cassette, the guide of the cassette can be performed without any special member, and the cassette can be guided with a small number of parts, so that the cost is low. Can be.

B. The configuration of the cassette insertion door is only three doors at the same position, and does not require a member different from a normal door shape such as a large cassette detection lever shown in the conventional example. Compared to the insertion window portion (for example, VHS), unnaturalness in design and use is reduced, and restrictions in design are also reduced.

C. Since the position of the insertion window portion of the exterior member and the position of the door of the cassette insertion slot can be made close to each other, a sense of incongruity in design and use is reduced, and design restrictions are also reduced.

D. A step is provided on the cassette insertion door,
Since this is used as the left and right guides when inserting the cassette, the guide of the cassette can be performed without requiring any special members, and thereby the distance between the cassette holder door and the cassette holder can be shortened. Design constraints on cassette loading are reduced.

E. The number of parts of the whole components is smaller than that of the conventional example, and the cost is excellent.

F. There is no need to provide a specific groove or recess in the shape of the cassette, and there is no design restriction on the design and function of the cassette.

[Brief description of the drawings]

FIG. 1 is a perspective view of a VTR provided with a cassette loading device of the present embodiment.

FIG. 2 is a sectional view of the cassette loading device of the present embodiment.

FIG. 3 is an exploded perspective view of the cassette loading device of the present embodiment.

FIG. 4 is a sectional view of an operation state in which a large cassette is inserted into the cassette loading device.

FIG. 5 is a sectional view of an operation state in which a small cassette is inserted into the cassette loading device.

FIG. 6 is a sectional view of an operation state in which a cassette is erroneously inserted into the cassette loading device.

FIG. 7 is an exploded perspective view of the cassette holder.

FIG. 8 is a perspective view of another embodiment of the cassette door.

FIG. 9 is a perspective view of another embodiment of the cassette door.

FIG. 10 is a perspective view of yet another embodiment of the cassette door.

FIG. 11 is a perspective view of a conventional cassette loading device.

FIG. 12 is a cross-sectional view showing a state where a large cassette is inserted into a conventional cassette loading device.

FIG. 13 is a sectional view showing a state where a small cassette is inserted into a conventional cassette loading device.

FIG. 14 is a perspective view of a conventional cassette holder in which large and small cassettes can be inserted separately.

FIG. 15 is a perspective view of another conventional cassette holder in which large and small cassettes can be inserted separately.

[Explanation of symbols]

Reference Signs List 1 mechanical chassis 2 exterior member 3 cassette insertion window 4 cassette door 4a, 4b thick portion 4c step portion 4d thin portion 5 cassette holder 11a, 11b support shaft 13a, 13b, 13a ', 13b' large cassette detection door 14a, 14b support Shafts 16a, 16b Working parts 17a, 17b, 18a, 18b Working pieces 20, 21 Door stoppers 20a, 21a Support shafts 22 Stopper pins 23 Spring members 24 Leaf springs 25a, 25b Cassette guides 26 Large cassettes 27 Small cassettes

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Uetake 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Kazuyoshi Suzuki 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/675

Claims (4)

(57) [Claims] 1. A cassette loading device having a cassette holder for moving one of two or more types of recording medium cassettes having different sizes from an insertion position to a cassette loading position, and a moving mechanism for performing a movement operation of the cassette holder. In the cassettes having different sizes, a cassette insertion door having a stepped portion in a cassette insertion direction is provided at both ends in a width direction of a position where a small cassette is to be inserted, and a size of the cassette to be inserted is provided. Limiting means for limiting the amount of rotation of the door of the cassette insertion slot in accordance with the movement of the door.
And a second state having a larger rotation amount than the first state, and positioning the small cassette by the step portion. 2. The door of the cassette insertion slot is partially divided into a divided door, and a pivot of the divided door is formed at a position different from that of the pivot of the door. 2. A cassette loading device for a recording / reproducing apparatus according to claim 1, wherein said restricting means is operated to switch the rotatable angle of said cassette. 3. A transmission mechanism for transmitting the driving force of the divided door of the cassette insertion door to the limiting means for switching the rotatable angle of the cassette insertion door by an X-shaped link mechanism. 3. A cassette loading device for a recording / reproducing device according to claim 2, wherein: 4. A restricting means for restricting a position in the width direction of the small cassette which moves between a position protruding toward the inner surface of the cassette holder and a position substantially flush with the inner surface of the cassette inside the cassette holder. 2. A cassette loading device for a recording / reproducing device according to claim 1, further comprising: