JPH04106754A - Cassette loading device - Google Patents

Abstract

PURPOSE:To smoothly and easily execute inserting operation only with horizontal force for insertion by releasing lock by pushing the projecting part of a second door lock member, which is protruded through a second door to the user side, with the front lid of a compact cassette. CONSTITUTION:When inserting a compact cassette C, the front face of the cassette pushes a projecting part 81 as mentioned above, a second door lock member 80 is rotated, the lock with the stopper part of a first door 21 is released, a second door 31 is pushed to be open by the cassette, in the other case, a lock piece 83 of the member 80 is locked by the stopper pat of the first door 21, and the second door 31 is operated integrally with the first door 21. Further, a tongue piece 84 is provided at a point separated from the axial part of the member 80 and in a bracket 10, a second door lock releasing member 90 is provided to turn the member 80 in a lock releasing direction by pushing the above-mentioned tongue piece 84. Thus, when ejecting the compact cassette, the tongue piece 84 is pushed by the releasing member 90, the member 80 is turned and the second door 31 can be opened to the first door 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in front-loading cassette mounting devices.

(Prior Art) Two large and small cassettes, a standard cassette and a small cassette, are selected for a front-loading type cassette loading device for installing a cassette containing a built-in magnetic tape in a magnetic recording/reproducing device (hereinafter referred to as rVTRJ), etc. There are some that are designed to be worn in a specific manner.

FIG. 12 is a perspective view of a standard cassette C2, in which a supply reel 211 on which magnetic tape (not shown) is wound inside a housing 210.
and a take-up reel 212 are housed therein. An opening 213 into which a tape loading member for pulling out the magnetic tape fits is formed on the front side, and an opening 213 is formed on the front side of the magnetic tape (
A lid (front lid) 214 is provided to cover the main body (not shown). Further, 215 is a reference hole for positioning, and 216 is a reference surface for height determination.

FIG. 13 is a perspective view of the small cassette C1, and inside the housing 220 is a supply reel 22 wound with magnetic tape (not shown).
1 and a take-up reel 222 are stored therein.

An opening 223 into which a chip loading member for pulling out the magnetic tape fits is formed on the front side, and a lid (front lid) is formed to cover the magnetic tape (not shown) on the front side.
224 is provided. Further, 225 is a reference hole for positioning, 227 is a reference surface for height determination, and 226 is a protrusion for unlocking the lid 224 provided to protrude from the side surface.

FIG. 14 is a diagram showing the arrangement relationship when the standard cassette C2 and the small cassette C1 are installed. .221 is on the same axis.

In such a cassette mounting device that can handle two large and small cassettes, the width dimension of the cassette holder into which the cassette is mounted is approximately equal to the width dimension of a standard cassette, so the small cassette can be inserted into any position within the cassette holder. , there is a possibility that it may not be inserted in the predetermined regular position.

For this reason, for example, Japanese Patent Laid-Open No. 63-146263 and Japanese Patent Laid-Open No. 63-191347 have proposed a system in which a small cassette can be inserted into a predetermined regular position.

The device described in Japanese Patent Application Laid-Open No. 63-146263 has a cassette insertion detection member and a door lock member interlocked with the cassette insertion detection member disposed at two locations on both ends of the cassette insertion slot with approximately the same dimension in the width direction of the small cassette. In addition, a cassette insertion prohibiting lid member is provided approximately in the center of the upper two detection members,
When a small cassette is inserted in the correct position, the two detection members and the door lock member are activated to open the cassette insertion prohibition cover member to enable insertion and mounting, and the cassette is inserted in an incorrect position. Sometimes, only one detection member is activated, and the other detection member and door lock member make it impossible to open the lid member.

However, the configuration of the detection member, door lock member, lid member, etc. is complicated and requires a large number of parts (not only is the cost high), but the configuration described above is provided on the top surface of the cassette holder, so the cassette loading device Thickness increases and VTR
The whole thing had to be thicker too.

On the other hand, in the device described in Japanese Patent Application Laid-Open No. 63-191347, the door is divided into left and right halves, one side, for example, the left door, is set to a width corresponding to a small cassette, and a door lock lever is installed on both the left and right doors. 11a, 1lb (Figure 2)
This is an upper cassette for business use (MII format VTR) in which the small cassette is formed so that the left end and front end are the same as the standard cassette.

(Problem to be solved by the invention) However, the small cassettes generally used for consumer use (
VHS-C (registered trademark) is narrower than the above-mentioned small commercial cassette, and therefore, when a small consumer cassette is inserted into a wide door, it cannot be inserted in the correct position.

Therefore, it is conceivable to form a small door corresponding to the small consumer cassette on the full-width large door, that is, to form the small door with a required spacing from the left end, but in this case,
The left-hand door lock member must be moved inward to accommodate this.

On the other hand, as shown in FIG. 12, the standard cassette C2 has an opening 213 at its front bottom. If the door lock member is installed on the inside, the bottom of the standard cassette C2 will reciprocate on the door lock member, so the door lock member pressed down by the lid 214 of the large cassette C2 will close to the opening of the large cassette C2. As it rises at part 213,
The door lock member will enter the opening 213,
This door lock member could not be used because it might damage the magnetic tape.

Furthermore, as shown in Figure 2 of JP-A-64-191347,
If the door lock members 11a and 11b are installed at a low position, the small cassette C1 will be pushed up, so in order to insert the cassette C1, it is necessary to insert it while pushing it downward. There are also drawbacks such as difficulty in inserting the cassette C1.

The present invention has been made in view of the above points, and it is possible to lock the door for standard and small cassettes in a closed state to prevent hands or foreign objects from being inserted, and also to prevent small cassettes from being inserted into the regular cassette. When the cassette is inserted in the normal direction from the insertion position, only the small cassette door can be rotated, and when the standard cassette is inserted from the normal insertion position in the normal direction, both the standard and small cassette doors can be rotated. It is an object of the present invention to provide a cassette mounting device that allows each cassette to be inserted smoothly and reliably, and prevents the tape from being damaged when the two cassettes are attached and detached.

(Means and effects for solving the problem) To achieve the i2 objective, the present invention provides a first door for a first cassette insertion slot for a large cassette, and a first door for a small cassette. A 112-force set insertion opening is formed in the cutout, and the second cassette insertion opening is provided with a second door, and second doors are provided on both sides of the second door for locking the second door to the first door. The second door lock members include a convex portion that penetrates the second door and protrudes toward the front, and a detail that rotates the second door lock member in a substantially horizontal direction by pushing the convex portion. and a lock piece extending toward the first door, and the first door is provided with a stopper portion that engages with and locks the lock piece to constitute a cassette loading device.

With this configuration, when inserting a small cassette, the front surface of the cassette inserts the convex part, rotates the second door lock member, releases the lock with the stopper part of the first door, and then inserts the cassette into the first door. The second door is pushed open, and at other times, the lock piece of the second door lock member is locked to the stopper part of the first door, and the second door is operated integrally with the first door.

Furthermore, the second door lock member is provided with a tongue piece at a location away from the details thereof, and the bracket includes a second door lock release member that pushes the tongue piece to rotate the second door lock member in the unlocking direction. will be established.

With this configuration, when a small cassette is ejected, the second door unlocking member inserts the tongue piece, rotates the second door locking member, and makes it possible to open the second door relative to the first door.

Further, the present invention provides a first door for a first cassette insertion port for a large cassette, a second cassette insertion port for a small cassette is formed in a cutout in the first door, and the second cassette insertion port for a small cassette is provided with a first door. A second door is provided in the insertion slot, and second door lock members are provided on both sides of the second door for locking the second door to the bracket.
a convex portion that penetrates the door and projects in front of the first door; a shaft portion that rotates the second door lock member in a substantially horizontal direction by pushing the convex portion; and a shaft portion that rotates from the lower side of the second door. The bracket further includes a lock piece extending downward, and the bracket is provided with a stopper arm that engages with and locks the lock piece to constitute a cassette mounting device.

With this configuration, when inserting a large or small cassette, the front of the cassette inserts the convex part, rotates the second door lock member, releases the lock with the stopper arm, and then
The second door is pushed open with the cassette, and at other times the lock piece of the second door lock member is engaged with the stopper arm, and the second door is locked to the bracket side.

Further, the stopper arm is swingably provided on the bracket, and a second door lock release lever that allows the stopper arm to swing is connected to the stopper arm.

With this configuration, when a large or small cassette is ejected, the second door lock release lever forcibly swings the stopper arm, thereby making it possible to remove the stopper arm from the lock piece of the second door lock member.

(Example) Embodiments of the invention will be described below on the basis of the attached sections.

For ease of understanding, an overall explanation will be given first.

FIG. 2 is a flat blade of the cassette mounting device according to the present invention with the top plate removed, and FIG. 3 is a front view of the same.

The cassette mounting device ff1l is broadly divided into a bracket 10 constituting a cassette housing main body, a first cassette insertion slot 20 on the front surface of this bracket 10, a first door 21 that blocks this, and a first door 21. A second cassette insertion opening 30 formed with a notch, a second door 31 that closes this, a cassette holder 40 movably disposed within the bracket 10, and a movement mechanism for this cassette holder 40 (
(referred to as a "holder moving mechanism") 50.

These configurations will be explained in detail below.

The bracket 10 includes left and right side plates 11, 12 and a top plate 13 (
3) and a front panel 14, and the right side plate 12 has a lid (front lid) of a standard cassette C2 (hereinafter referred to as 1 large cassette in contrast with the ``small cassette'' described later). A lid opener member 15 is provided for opening the lid.

The first cassette insertion port 20 is for the large cassette C2, and the second cassette insertion port 30 is for the small cassette C1.For convenience of aligning the centers of the supply reels built into the cassette, as shown in FIG. , the first and second cassette insertion slots 2
0.30 is characterized by the fact that both the left and right ends are not in the same position.

As shown in FIG. 3, the first door 21 is a large door that almost blocks the first cassette insertion slot 20, and the second door 3
1 is much smaller in width (left and right dimensions) than the first door 21.

As shown in FIG. 2, the cassette holder 40 has a mouth shape when viewed from the front from a bottom plate 41, a top plate 42, and left and right side plates 43, 44, and has a width dimension that is approximately the same as that of a large cassette, and accommodates a large cassette. A large cassette storage section is formed, and a small cassette storage section is formed inside the large cassette storage section. Note that the inner surface (upper surface) of the bottom plate 41 is a flat surface.

The cassette holder 40 is moved by a holder moving mechanism 50 between a cassette insertion standby position and a cassette predetermined mounting position shown in FIG. For that purpose, the holder moving mechanism 5
0 transmits the driving force of the housing motor 51 in the upper right corner of the figure to the lower part of the figure via the belt 51 and the gear train (not shown), and swings the left and right main gears (not shown). The left and right main gears each include a two-pronged fork portion, and the fork portions swing in the same manner as the main gear swings. On the other hand, bins (not shown) protrude from the left and right sides of the cassette holder 40, and these bins engage with abbreviated guide grooves (not shown) formed in the side plates 11 and 12 of the bracket. . Since the left and right bottles are narrowed so as to be movable in the longitudinal direction of the hawk through the guide groove, the housing motor 51 of the holder moving mechanism 50 is started, and the hawk is moved to the second hawk.
When tilted in the Y direction in the figure, the cassette holder 40 moves in the Y direction and then descends (towards the back of the figure).

Next, the locking mechanism of the first and second doors will be explained. 1st
・The second door is locked except when necessary (when loading and unloading cassettes) to prevent foreign objects from entering. This point will be explained next based on the drawings.

FIG. 4 is a plan view of the right end of the first door, in which the first door 21 is swingably latched to the back surface of the front panel 14 of the bracket IO with a long shaft 22 passing horizontally through the upper part of the door. ing. On the other hand, first door lock machine widths 60.60 are provided on the left and right sides of the first cassette insertion slot 20. The first door lock mechanism 60 has a first door lock member 62 that swings around a fulcrum 61 on the front panel 14 as a main component. A tapered portion 63, a locking recess 62a formed by a claw portion 64 that can engage with the rear surface of the first door, and a rear tapered portion 65 used to push out the claw portion 64 of the locking recess 62a to the open position. has.

Large cassette detection switches 66, 66 (for example, button head type limit switches) are provided on the outside of the first door lock member 62, 62, and both switches 6
6.66 is on and it is determined that a large cassette has been inserted. If only one pressure detection switch 66 is turned on, it is determined that the cassette has been inserted by mistake.

When the large cassette 02 is installed in a predetermined mounting position, the first door 21 is closed and locked by the first door lock member 62, but this predetermined mounting position! Since it is necessary to open the first door 21 when ejecting (extracting) the large cassette C2 installed in the cassette C2, the first door 21 must be opened during this time when the lid is operated.

The first door unlocking machine side 70 is a first door unlocking member that is swingably supported on a shaft 71 that is hooked horizontally to the left and right side plates 11 and 12 of the bracket IO behind the first door 21. 72 as a main body, the first door unlocking member 72 has a see-saw shape, and is configured such that its end opposite to the door (upper side in the figure) is positioned upward and the near side is positioned downward by a spring (not shown). Then, the first
An actuating part 73 having a tapered surface related to the rear tapered part 65 of the door rotor member 62 is formed, and a contact part 74 that contacts the lower surface of the large cassette is provided on the back side. Therefore, when the large cassette C2 that is mounted to a predetermined mounting position for recording and playback comes down, the contact portion 74
is pushed down, the actuating part 73 is raised, and this actuating part 73
By pushing out the first door lock member 62 in the opening direction (arrow ■), the lock by the first door lock mechanism 60 is released.

The second door lock member and release member for the second door will now be described.

FIG. 5 is an exploded view of the attachment part of the second door, seen from behind the first door 21. FIG.

That is, the second cassette insertion opening 30 formed in a notch in the first door 21 is closed by the second door 31.

The second door 31 is swingably locked to the first door 21 by a shaft 32. Vertical slits 33, 33 are bored in the left and right sides of the second door 31, and these slits 3
A projecting portion 34 having a U-shape and an inverted U-shape when viewed from the front is provided on the further outside of 3.

Shown at the bottom left of the figure is the second door lock member 80,
This member 8o has a large convex portion 81 and a shaft portion 82, and is 4 in plan view.
The protrusion dimension of the convex portion 81, which includes a semicircular lock piece 83 and a downwardly extending tongue piece 84, is determined to protrude at least from the front surface of the second door 31. For example, as shown in FIG. As shown in FIG. 3, it protrudes beyond the second door 31 but does not protrude beyond the front surface of the first door 21.

A total of two second door lock members 80 are attached to the left and right sides of the second door 31, and a shaft portion 82 thereof is attached to the protruding portion 34.
The shaft portion 82 inserted into the hole 35 of the second door rotor member 80
The convex portion 81 is inserted into the slit 33.

The second door 31 in this state is locked to the first door 21 with the shaft 32. As shown in the figure, the first door 21 has a hook member 23 protruding from the back side, and a stopper at the tip of the hook member 23 is provided. Part 2
The lock piece 83 is configured to fit behind the lock piece 4.

Figure 6 is a rear view (first and second
FIG. 3 is a partial rear view of the door shown in FIG.

Note that the second door lock member 80 is biased in the direction of arrow {circle around (2)} in FIG. 5 by a spring (not shown).

Furthermore, a second door unlocking member 90 is provided below the second door locker member 80. This member 90 is fixed to the shaft 71 described in FIG. 4 so as to act on the tapered surface 84a of the tongue piece 84.

The rotation of the shaft 71 releases the second door lock release member 9.
0 swings to the position shown by the imaginary line, pushes out the tongue piece 84 to the left in the figure, and locks the second door lock member 80 around the shaft part 82.
Rotate.

The overall configuration of the cassette mounting device 1 according to the embodiment has been described above, but as shown in FIG. A second door 31 is provided in the two-cassette insertion slot 3o, and second door lock members 80 and 80 are provided on both sides of the second door 31,
The second door lock part 80 has a protrusion 81, a shaft part 82, and a lock piece 83, and the first door 21 is provided with a stopper part 24 that engages with the lock piece.

Next, the operation of the cassette loading device of the present invention will be described.

Figure 7 ta) and 'fb) are action explanatory diagrams.
As shown in Figure fa), when the small cassette C1 is manually inserted from the top to the bottom of the figure, the front lid of the small cassette CI presses the convex part 81, and the second door lock member 80 is moved around the shaft part 82 in the figure. It rotates clockwise, and as a result, the stopper portion 24 is also removed by the 50-pin piece 83.

The lid of the small cassette C1 moves further forward, and the unlocked second door 31 is opened to continue the insertion operation.

FIG. 7 (bl) shows the insertion of the large cassette C2, and the front lid of the large cassette C2 comes into contact with the first door 21.

Since the convex portion 81 does not protrude from the first door 21, it is not pushed by the cassette C2, and the second door lock member 80 maintains the locked state consisting of the lock piece 83 and the stopper portion 24 in the illustrated state.

At this time, the large cassette C2 pushes the front tapered portion of the first door lock member 62 shown in FIG. 4 to unlock the first door 21.

Therefore, the large cassette C2 includes the first door 31 and the second door 31.
Push the door 21 to open it.

Note that when the protrusion 81 protrudes from the first door 21, the second door 31 is unlocked as described above by being pushed by the front lid of the large cassette C2; The second door 31 that has been unlocked will be opened together with the first door 21 that has also been unlocked.

Next, when ejecting the large cassette C2, the first
Although it is necessary to unlock the door 21 by the first door lock member 62, the operation thereof is the same as described in FIG. 4, so a description thereof will be omitted.

On the other hand, when ejecting the small cassette C1, the second door 31 is locked to the first door 21 as shown in FIG. 7 (bl), so it is necessary to release this.
The second door lock member 80 is biased counterclockwise in FIG. 7 tb+ by a spring (not shown).

When ejecting the small cassette C1, the second door unlocking member 90 shown in FIG. 6 is swung through the shaft 71, thereby pushing out the tongue piece 84. When the tongue piece 84 is pressed, the second door lock member 80 moves around the shaft part 82 and moves to the seventh position.
The second door opener means [
(not shown) to open the second door 31.

In addition, except when inserting the large and small cassettes C1 and C2, the second door lock member 80 is
Since the lock piece 83 is locked by the stopper part 24, even if the first door and the second door 31 are pushed by hand from the outside, they will not open.

Figure 8 is another embodiment of the present invention, Figure 9 is 9-9 in Figure 8.
The line sectional view, FIG. 10 is a left side view of FIG. 8, and when compared with FIG. The lock piece 183 protrudes further than the first door 21, the tongue piece 84 is abolished and the lock piece 183 extends below the first cassette insertion slot 20, and the stopper part 24 on the back of the first door is The features are that a hook-shaped stopper arm 184 is attached to the lower part of the back of the front panel 14 so as to be able to swing up and down, and that a second door unlocking member 190 is connected to the stopper arm 184 via a pin.

FIG. 11 is an operational view, and when the small cassette C1 is inserted, the lid of the cassette C1 retreats to the position where the convex portion 181 is shown by the imaginary line, and the second door lock member 180 is moved around the shaft portion 182. The lock piece 183 moves in the direction of being removed from the stopper arm 184, and as a result, the second door 3
1 is pushed by a small cassette C1 to open the lid.

When the large cassette C2 is inserted, the lid of the cassette C2 retreats to the position where the convex portion 181 is indicated by the solid line, and similarly,
The lock is released and the first door 21 is pushed open by the large cassette C2.

Except when inserting the above-mentioned large and small cassettes CI and C2, the second door lock member 1 is inserted as shown in FIGS. 8 to 10.
Since the lock piece 183 of 80 is locked by the stopper arm 184, even if the first door 21 and the second door 31 are manually pushed from the outside, they will not open.

When ejecting the large and small cassettes C1 and C2, rotate the shaft 71 in FIG. 10 counterclockwise in the figure.
The stopper arm 184 is swung clockwise in the figure. Since the tip of the stopper arm 184 is lowered, the locked state is released and the second door 31 can be forcibly opened by a door opener means (not shown).

(Effects of the Invention) As described above, the present invention allows the lock to be released by pushing the convex portion of the second door lock member that penetrates the second door and protrudes toward the front with the front lid of the small cassette. Therefore, the insertion force only needs to be horizontal, making the insertion operation smooth and easy.

In the first invention in which the second door is locked to the first door, the large cassette is unrelated to the second door and the second door lock member, and therefore the large cassette is not connected to the second door and the second door lock member. The design of the parts becomes easier.

Further, in the second invention in which the second door is locked to the housing, the second door locking member and the second door unlocking member for the second door are shared by the small cassette and the large cassette. Since this is possible, the door lock member and the lock release member can be simplified.

In this way, the present invention prevents a hand or a foreign object from being inserted through the first cassette insertion port or the second cassette insertion port,
Moreover, the insertion of large and small cassettes can be performed smoothly and reliably, and the tape is not damaged when each cassette is attached or detached.

[Brief explanation of the drawing]

FIG. 1 is a main part view of the cassette loading device of the present invention, which corresponds to the I-I arrow view in FIG. 6, and FIG. 2 is a plan view of the cassette loading device of the present invention with the top plate removed. , FIG. 3 is a front view of the same, FIG. 4 is a plan view of the right end of the first door, FIG. 5 is an exploded view of the installation part of the second door, FIG. 6 is an assembled view of FIG. Figure 7(a). fbl is an action explanatory diagram, FIG. 8 is another embodiment diagram of the present invention,
9 is a sectional view taken along line 9-9 in FIG. 8, FIG. 10 is a left side view of FIG. 8, FIG. 11 is an operational view of another embodiment, FIG. 12 is a perspective view of a standard cassette, and FIG. The figure is a perspective view of the small cassette, and Figure 14 shows the arrangement when the standard cassette and small cassette are installed! It is a figure showing a relationship. 1... Cassette mounting device, 10... Bracket, 2
0: first cassette insertion slot, 21: first door,
30...-second cassette insertion slot, 31... second door, 40... cassette holder, 80.180... second
Door lock member, 81.181... Convex portion, 82, 18
2...Shaft part, 83.183...Lock piece, 84...
- Tongue piece, 90,190... second door lock release member,
184...stopper arm, C1...small cassette, C2...large cassette (standard cassette).

Claims (4)

[Claims] (1) Front-loading type in which large and small cassettes can be selectively inserted from the cassette insertion slot on the front of the main unit, the inserted cassette is supported by a cassette holder, and this cassette holder is movably supported by a bracket. In the cassette loading device, the cassette loading device includes a first door at the first cassette insertion port for large cassettes, and a second cassette insertion port for small cassettes is formed in the first door with a cutout. A second door is provided in the second cassette insertion slot, and second door lock members are provided on both sides of the second door to lock the second door to the first door. The lock member includes a protrusion that penetrates the second door and protrudes toward the front, a shaft that rotates the second door lock member in a substantially horizontal direction by pushing the protrusion, and a shaft that extends toward the first door. The first door is provided with a stopper portion that engages with and locks the lock piece, and when the small cassette is inserted, the front surface of the cassette pushes the convex portion and the first door After rotating the second door lock member and releasing the lock from the stopper part of the first door, push open the second door with the same cassette. Otherwise, the lock piece of the second door lock member will be locked to the second door. A cassette mounting device characterized in that the second door is integrated with the first door by being locked to a stopper portion of the first door. (2) The second door lock member is provided with a tongue piece at a location away from the shaft portion thereof, and the bracket is provided with a tongue piece to push the tongue piece to rotate the second door lock member in the unlocking direction. A lock release member is provided, and when the small cassette is ejected, the tongue piece is pushed by the second door lock release member, the second door lock member is rotated, and the second door can be opened with respect to the first door. The cassette mounting device according to claim 1, characterized in that: (3) Front-loading type in which large and small cassettes can be selectively inserted from the cassette insertion slot on the front of the main unit, the inserted cassette is supported by a cassette holder, and this cassette holder is movably supported by a bracket. In the cassette loading device, the cassette loading device includes a first door at the first cassette insertion port for large cassettes, and a second cassette insertion port for small cassettes is formed in the first door with a cutout. The second cassette insertion slot is provided with a second door, and second door lock members are provided on both sides of the second door for locking the second door to the bracket, and these second door lock members are provided with a second door. , a convex portion that penetrates the second door and projects toward the front of the first door, and a shaft portion that rotates the second door lock member in a substantially horizontal direction by pushing the convex portion;
The bracket includes a lock piece extending further downward from the lower side of the second door, and the bracket is provided with a stopper arm that engages with and locks the lock piece, and when inserting a large or small cassette, Insert the convex part into the front of the cassette, rotate the second door lock member to release the lock with the stopper arm, and then push open the second door with the cassette; otherwise, open the second door. A cassette mounting device characterized in that a locking piece of a locking member is locked to a stopper arm, and the second door is locked to the bracket side. (4) The stopper arm is swingably provided on the bracket, and a second door lock release lever for swinging the stopper arm is connected to the stopper arm, so that the second door is locked when a large or small cassette is ejected. The release lever forcibly swings the stopper arm,
4. The cassette mounting device according to claim 3, wherein the stopper arm is detachable from a lock piece of the second door lock member.