JPH051036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cassette holder locking mechanism that is most suitable for application to a cassette-type recording/reproducing apparatus such as an auto-reverse machine of a tape recorder.

[Summary of the idea]

In the present invention, when the cassette holder attached to the chassis is opened from the closed position to the open position, the locking member attached to the lower part of the chassis is moved to the forward position by the drive arm provided on the cassette holder. In the cassette holder locking mechanism configured to lock the cassette holder in an open position by engaging the drive arm with a lock portion provided on the locking member, the locking member is upwardly biased toward the chassis. In addition, by providing a protrusion on the lower surface of the chassis and providing the locking member with an inclined surface opposite to the protrusion, when the cassette holder is opened to the open position, the locking portion of the locking member moves to the above-described position. The lock portion is projected onto the chassis by a spring, and when the cassette holder is closed to the closed position, the lock portion is released below the chassis against the spring due to the guiding action of the protrusion and the inclined surface. This ensures locking in the open position and prevents the lock portion from getting in the way when the cassette holder is closed in the closed position.

[Conventional technology]

Conventionally, regarding the locking mechanism of the cassette holder of a cassette type recording/reproducing apparatus, for example, the specification of U.S. Pat.
35427) exists.

The invention has a cassette 88 as shown in FIG.
A cassette holder 81 that opens and closes in the directions of arrows a and b between an open position where the inserted cassette 88 is inserted and removed and a closed position where the inserted cassette 88 is mounted on the recording and reproducing position on the chassis 80 is connected to the recording and reproducing apparatus (Fig. (not shown) is attached to one side of the chassis 80. At the bottom of the cassette holder 81,
A claw-like drive arm 83 is attached to move the lock member 82 back and forth.

At the bottom of the chassis 80 is a cassette holder 81.
A lock member 82 that reciprocates around a shaft 85 in conjunction with the chassis 80 is disposed, and a lock portion 87 consisting of a stepped portion is located above the lock piece 86 of the lock member 82 that protrudes to the side of the chassis 80. is provided.

Then, when the cassette holder 81 is opened from the closed position to the open position in the direction of arrow a, the cassette holder 8
One drive arm 83 slides on the side surface 86a of the lock piece 86 of the lock member 82, and the lock member 82 is moved forward in the direction of arrow d against a spring (not shown).
When the cassette holder 81 is opened to the open position, the end 83a of the drive arm 83 of the cassette holder 81 engages with the lock portion 87 of the locking member 82, and the cassette holder 81 is locked in the open position.

After inserting or removing the cassette 88, when the cassette holder 81 is strongly pressed in the direction of arrow b, the end 83a of the drive arm 83 and the lock portion 87
The cassette holder 81 is closed to the closed position. Accordingly, the lock member 82 is moved back in the direction of arrow c by a spring (not shown),
Moved to return position. The cassette 88 is mounted parallel to the chassis 80 in close contact with the cassette 88, thereby making the recording/reproducing apparatus thinner.

[Problem that the invention attempts to solve]

However, according to the invention, the lock member 8
Due to a dimensional error between the lock part 87 of the lock member 82 and the drive arm 83, or looseness in the attachment of the lock member 82, the engagement between the lock part 87 of the lock member 82 and the end part 83a of the drive arm 83 is disengaged, and the lock member 8
The upper end 87a of the lock portion 87 of No. 2 sinks into the lower part of the end portion 83a of the drive arm 83 as shown by the dashed line in FIG. 6, and the lock member 82 is moved back in the direction of arrow c by a spring (not shown). As a result, the locking of the cassette holder 81 in the open position often becomes ineffective. Such inability to lock makes it difficult to insert the cassette 88 into the cassette holder 81 and to remove the cassette 88 from the cassette holder 81, which is a fatal defect in the recording and reproducing apparatus as a commercial product.

In order to prevent the locking failure as described above, the upper end 87a of the lock portion 87 of the lock member 82 is extended above the chassis 80 to protrude above the chassis 80, and the lock portion 87 and the end portion 83a of the drive arm 83 are
However, in this way, when the cassette holder 81 is closed to the closed position and the cassette 88 is installed in the recording/playback position on the chassis 80, the Upper end 87a of lock portion 87 of protruding lock member 82
However, I ended up pushing the cassette 88 up from the bottom.
This causes the cassette 88 to float above the chassis 80.

When the cassette 88 is floated above the chassis 80 in this way, the lid (not shown) of the recording/reproducing device is opened.
The reel shaft of the recording/reproducing device (not shown) may not close properly, or the recording/reproducing head (not shown) may become misaligned with the cassette 88, resulting in recording/reproducing failures. (not shown) may cause poor tape running due to poor engagement with the tape (not shown). In order to eliminate this inconvenience, the mounting position of the cassette 88 can be locked using the locking member 82.
If it is set at a position where it cannot be pushed up by the upper end 87a of the locking portion 87, the thickness of the recording/reproducing device will increase, making it impossible to make the recording/reproducing device thinner.

Furthermore, the cassette 8 from the cassette holder 81
In order to facilitate the insertion and removal of the cassette holder 81, it is necessary to open the cassette holder 81 wide. Although it is necessary to engage the drive arm 83 with the lock portion 87 as far above the chassis 80 as possible, according to the invention, it is not possible to make the lock portion 87 protrude above the chassis 80 due to the above-mentioned disadvantages. Can not.

Therefore, in the present invention, when the cassette holder is in the open position, the lock part of the lock member protrudes above the chassis to ensure that the drive arm is engaged with the lock part of the lock member, and when the cassette holder is in the closed position, the lock part of the lock member is protruded above the chassis. The object of the present invention is to provide a locking mechanism for a cassette holder in which a portion of the cassette holder is released below the chassis.

[Means for solving problems]

The present invention relates to a cassette holder that is attached to a chassis so as to be freely opened and closed between an open position for inserting and removing a cassette and a closed position for mounting an inserted cassette at a recording/playback position on the chassis;
The cassette holder lock mechanism comprises a lock member disposed under the chassis and reciprocated in conjunction with the cassette holder, a drive arm provided on the cassette holder, and a lock portion provided on the lock member, and when the cassette holder is opened from the closed position to the open position, the drive arm moves the lock member to a forward movement position, and the drive arm engages with the lock portion of the lock member to lock the cassette holder at the open position. A protrusion is provided on the underside of the chassis, and a lock member is provided on the lock member in the forward movement direction opposite to the lower portion of the protrusion. a spring is provided which urges the lock member upward toward the chassis, and when the cassette holder is opened to the open position and the lock member is moved to the forward position, the spring raises the lock member so that the lock portion protrudes above the chassis, and when the cassette holder is closed to the closed position and the lock member is moved to the return position, the guiding action of the protrusion and the inclined surface causes the lock member to descend against the spring, allowing the lock portion to escape below the chassis.

[Effect]

According to the present invention, when the cassette holder is opened to the open position and the locking member is moved to the forward position by the drive arm, the locking member is raised by the spring and the locking portion is projected above the chassis. . In this state, the drive arm is engaged with the lock portion, and the cassette holder is securely locked in the open position.

Next, when the cassette holder is closed to the closed position, the lock member is moved back to the return position. At this time, the locking member is lowered against the spring by the guiding action of the protrusion of the chassis and the slope of the locking member, and the locking portion is released below the chassis, so that the cassette is moved parallel to the chassis. It can be installed in close contact with the

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an auto-reverse machine for a tape recorder will be described based on the drawings.

As shown in FIGS. 1 and 2, a cassette holder 6 for holding a cassette 10 is attached to a chassis 12 of a tape recorder main body (not shown). The cassette holder 6 is pivotally supported via a fulcrum shaft 13 on the holder mounting base 4 of the chassis 12 so as to be rotatable in the directions of arrows e and f. The cassette 10 is configured to be openable and closable between a recording/reproducing position on the chassis 12 and a closed position. A cassette lid (not shown) is attached to the upper side of the cassette holder 6. A magnetic head (not shown), a pair of left and right pinch rollers (not shown), and the like are attached to the cassette holder 6. The cassette holder 6 is moved to the closed position in the direction of arrow f by a tension coil spring 16 whose both ends are locked to a pair of upper and lower spring locking portions 14 and 15 provided on the holder mounting base 4 and the cassette holder 6, respectively. energized. Further, a stopper piece 17 having a substantially L shape is integrally provided on the cassette holder 6, and when the cassette holder 6 is opened to the open position in the direction of arrow e, the stopper piece 17 is integrally attached to the holder mounting base 4. It comes into contact with the provided stopper 18,
Rotation of the cassette holder 6 is restricted.

A drive arm 19 curved into a substantially circular arc shape is integrally provided at the lower part of the cassette holder 6.
This drive arm 19 is for reciprocating a lock member 22, which will be described later.

At the bottom of the chassis 12, as shown in FIG.
Switch 2 composed of a leaf switch for operating a normal driving priority mechanism (not shown)
1 is placed. A lock member 22 is attached to the lower part of one end of the chassis 12 through a fulcrum shaft 23 in the direction of arrows g and h between the forward movement position shown in FIG. 3A and the backward movement position shown in FIG. 3B. It is configured to be movable (rotatable).

The lock member 22 is integrally provided with a switch operating portion 32 that operates the switch 21 when the lock member 22 is moved to the forward position in the direction of arrow g, and a lock piece 30 that locks the cassette holder 6 in the open position. ing.

The side surface 30a of the lock piece 30 is a sliding surface on which the drive arm 19 of the cassette holder 6 slides, and a lock portion 31 consisting of a stepped portion is provided above the side surface 30a. By engaging the end portion 19a of the drive arm 19 with this lock portion 31, the cassette holder 6 is locked in the open position. The upper end 31a of this lock portion 31
As shown in FIGS. 1 and 5A, the upper end 31a is extended upwardly, and due to the mounting play of the locking member 22, the upper end 31a of the locking member 22 is attached to the end 19 of the drive arm 19.
This prevents the lock portion 31 and the end portion 19a of the drive arm 19 from disengaging from each other by sinking into the lower part of the drive arm 19a. Further, a protrusion 40 is provided at the upper end of the locking piece 30 and projects horizontally in the direction of the chassis 12, and when the locking member 22 is moved to the forward position, this protrusion 40 is disposed as shown in FIGS. 2 and 3A. The lock portion 3 is secured to the upper surface of the chassis 12 as shown in FIG.
1 is prevented from falling downward, and the engagement between the lock portion 31 and the drive arm 19 is ensured.

A spring 29 made of a torsion coil spring is attached to the locking member 22, as shown in FIGS. 1, 3A and 3B. Spring 29 is the third A
As shown in FIG. 3B, both ends 29a, 2
9b are respectively locked to spring locking portions 27 and 28 provided on the lock member 22 and the chassis 12,
The central coil portion 29c is attached to the fulcrum shaft 23 with its upper and lower sides restricted by the lower surface of the lock member 22 and the upper surface of a disc-shaped flange portion 26 provided on the fulcrum shaft 23. The spring 29 biases the lock member 22 to the return position shown in FIG. 3B, and the coil portion 29c biases the lock member 22 upward toward the chassis 12.

On the lower surface of the chassis 12, as shown in FIG.
The locking member 22 is provided with an inclined surface 42 facing the lower part of the protrusion 50 thereof. The inclined surface 42 is shown in FIGS. 2, 3A, and 3.
As shown in Figure B, a protrusion 50 is provided at the end of the elongated hole 41 that moves inside, and is inclined so as to gradually approach the chassis 12 along the forward movement direction shown by arrow g in Figure 2. It is being And the third
When the lock member 22 is moved back to the return position as shown in Figure B, the inclined surface 42 slides on the protrusion 50,
As shown in FIG. 5B, the locking member 22 is secured to the spring
The lock part 31 is lowered against the chassis 12.
is configured to move downward.

Next, the operation of the above embodiment will be explained.

First, when the cassette holder 6 is opened to the open position in the direction of arrow e as shown in FIGS. to move (rotate) the locking member 22 from the backward movement position shown in FIGS. 3B and 5B to the forward movement position shown in FIGS. 3A and 5A. Accordingly, the protrusion 50 of the chassis 12 moves relatively along the inclined surface 42 of the locking member 22, and the locking member 22 is moved by the spring 2.
The chassis 1 is moved by the biasing force of the coil portion 29c of
2 side, and the lock portion 31 is made to protrude above the chassis 12 as shown in FIGS. 1 and 5A. In this state, the lock portion 31 of the lock member 22
The end 19a of the drive arm 19 is engaged with the first
When the cassette holder 6 is locked in the open position as shown in FIGS.
2 and prevents the lock portion 31 from falling downward. After inserting the cassette 10, which is a compact cassette, into the cassette holder 6, the cassette holder 6 is closed to the closed position in the direction of arrow f, and the cassette 10 is mounted on the chassis 12 at a recording/reproducing position.

As the cassette holder 6 moves to the closed position, the lock member 22, which has been in the forward movement position shown in FIGS. 3A and 5A, is moved by the spring 29 to the backward movement position shown in FIGS. 3B and 5B. . At that time, as shown in FIGS. 3B and 5B, the protrusion 5 of the chassis 12
0, the locking member 22 is lowered against the biasing force of the coil portion 29c of the spring 29, and the locking portion 31
As shown in the figure, it is released below the chassis 12. Therefore, even if the cassette 10 is mounted on the chassis 12 in parallel to the recording/reproducing position, the upper end 31a of the lock portion 31 will not push the cassette 10 upward from below. On the other hand, as the locking member 22 moves back, the protrusion 40 of the locking member that was locked to the upper surface of the chassis 12 also moves as shown by the solid line in FIG. 4, and is released from the locking.

After the cassette 10 is inserted into the recording/reproducing position on the chassis 12, the magnetic tape (not shown) in the cassette 10 is normally run and then reversed to perform the desired recording (reproducing) operation.
After recording (reproduction), the cassette holder 6 is opened in the direction of the arrow e to the open position, and the cassette 10 is removed from the cassette holder 6.

At this time, in this tape recorder, when the cassette holder 6 is opened to the open position, the switch operating section 32 provided on the lock member 22 operates the switch 21 to release the magnetic tape, as shown in FIGS. 2 and 3A. A normal running priority mechanism (not shown) is activated so that even if the magnetic tape running mode is in reverse mode and the cassette 10 is removed, the next time the cassette 10 is loaded, it will always be in the normal mode. . At this time, the drive motor is rotated for several seconds by switching the switch 21 to the on state, and a plunger or the like is operated to switch the normal/reverse switching mechanism (none of which is shown) to the normal mode.

According to the embodiment described above, when the end portion 19a of the drive arm 19 is engaged with the lock portion 31 and the cassette holder 6 is locked in the open position, the protrusion 40 provided at the upper end of the lock member 22 is engaged with the lock portion 31. As shown in FIG. 2, since the lock member 22 is configured to be locked on the upper surface of the chassis 12, the end 19a of the drive arm 19 is configured to move up and down by the spring 29. lock part 3
This prevents the lock portion 31 from moving downward and disengaging the two when engaged with the cassette holder 6, and the cassette holder 6 can be reliably locked in the open position.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment described above, the protrusion 50 and the inclined surface 4
2, the lock portion 31 side of the lock member 22 is made to swing up and down about the fulcrum shaft 23, and thereby the lock portion 31 moves up and down. However, the lock member 22 itself may be moved vertically in parallel by the guiding action of the protrusion 50 and the inclined surface 42.

Further, in the embodiment, a rotating locking member is used, but the locking member may be a linearly moving locking member.

Furthermore, the present invention is not limited to tape recorders that use compact cassettes, but can be applied to various cassette-type recording and reproducing apparatuses that use various tape cassettes and disk cassettes (disk cartridges).

[Effect of idea]

According to the present invention, when the cassette holder is opened to the open position and the lock member is moved to the forward position, the lock member is raised by the spring that biases the lock member upward toward the chassis, and the lock portion is moved toward the chassis. Since it is designed to protrude upward, the lock part can be formed so that the engagement between the lock part and the drive arm of the cassette holder does not come off easily, and the lock part is ensured when the cassette holder is in the open position. can be done.

In addition, since the lock portion protrudes above the chassis, the drive arm, which has a limited length, is attached to the lock portion above the chassis to prevent contact with the top, bottom and side surfaces of the recording/reproducing device. can be engaged. Therefore, the cassette holder can be opened wide upwards, and the cassette can be easily inserted into and removed from the cassette holder.

Furthermore, when the cassette holder is closed to the closed position and the lock member is moved back to the return position, the lock member springs due to the guiding action of the protrusion provided on the chassis and the inclined surface provided on the lock member. The cassette is lowered against the cassette and the lock part escapes below the chassis, so even if the cassette is mounted parallel to the chassis,
The lock section does not push the cassette up from below and float it above the chassis, making it impossible to close the lid of the recording/reproducing device, preventing recording/reproducing due to misalignment between the cassette and the recording/reproducing head, and preventing the reel shaft insertion hole of the cassette from recording/reproducing. It is possible to prevent poor running of the tape due to poor engagement with the reel shaft of the device. According to the present invention, although the cassette holder can be reliably locked in the open position as described above, the cassette can be mounted parallel to the chassis in close contact with the cassette holder.
It becomes possible to reduce the thickness of the recording/reproducing device.

[Brief explanation of the drawing]

Figures 1 to 5B show an embodiment of the present invention, in which Figure 1 is a vertical sectional view of the main part, Figure 2 is a perspective view of the main part, and Figure 3A is a locking member. Fig. 3B is a bottom view of the main parts when the lock member is in the forward movement position, Fig. 4 is a sectional view taken along line A-A of Fig. 3B, Fig. 5A Figure and 5B
The figure is a side view showing the relationship between the protrusion of the chassis and the inclined surface of the lock member. FIG. 6 is a perspective view showing a locking mechanism of a conventional cassette holder. In addition, in the symbols used in the drawings, 6...Cassette holder, 10...Cassette, 12...Chassis, 19...Drive arm, 22...Lock member, 29...Spring, 31...Lock portion, 42... …
An inclined surface, 50...a protrusion.

Claims (1)

[Claims for Utility Model Registration] A cassette holder attached to the chassis so as to be openable and closable between an open position where a cassette is inserted and removed and a closed position where the inserted cassette is mounted on a recording/playback position on the chassis. a lock member disposed at the bottom of the chassis and reciprocated in conjunction with the cassette holder; a drive arm provided on the cassette holder; and a lock portion provided on the lock member; When the cassette holder is opened from the closed position to the open position,
The cassette holder is configured to move the lock member to a forward position by the drive arm, engage the drive arm with the lock portion of the lock member, and lock the cassette holder at the open position. In the lock mechanism, a protrusion is provided on the lower surface of the chassis, and an inclined surface is provided on the lock member opposite to the lower part of the protrusion so as to gradually approach the chassis along the forward movement direction of the lock member, and the lock A spring is provided for biasing the member upward toward the chassis, and when the cassette holder is opened to the open position and the lock member is moved to the forward position, the spring causes the lock member to rise and the lock member is moved to the forward position. When the cassette holder is closed to the closed position and the lock member is moved to the return position, the lock member is moved by the guiding action of the protrusion and the inclined surface. A locking mechanism for a cassette holder, characterized in that the locking mechanism is configured to be lowered against the spring so that the locking portion is released below the chassis.