JPH01211358A - Device for locking/releasing cassette holder - Google Patents

Abstract

PURPOSE:To make a driving source which is exclusively used for locking a cassette holder and releasing the holder from a locked state unnecessary by installing a lock arm which can engage a lock plate with another lock plate to a link supporting the cassette holder in a projecting state. CONSTITUTION:When a cassette holder 3 is pushed down, a link 4 supporting the holder 3 throws down and a lock arm 6 is engaged with the hook section 52 of a lock plate 5 while the arm 6 pushes the descending lock plate 5 toward a head cylinder 11 and as a result, the holder 3 is tied to its descending position. When a sub-chassis 2 advances, the lock plate 5 hits the releasing piece 7 of a main chassis 1, but the rotation is prevented by a stopper 54 and gets over the releasing piece 7 by pushing the piece 7 away. When the mode is switched to the eject mode, the sub-chassis 2 retreats. While the sub-chassis 2 retreats, the lock plate 5 hits the releasing piece 7 and rotates and the engagement of the lock plate 5 with the lock arm 6 is released. As a result, the cassette holder 3 is lifted up by the force of a spring. Therefore, a special driving source which is exclusively used for locking the holder 3 and releasing the holder from a locked state becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a locking and unlocking device for a cassette holder of a small magnetic recording/reproducing device such as an 8 m+a VTR or a digital audio tape recorder.

(Prior Art) Conventionally, a compact magnetic recording/reproducing device has been proposed in which the depth of the device in the play mode is smaller than the depth of the device in the eject mode (Japanese Patent Laid-Open No. (Sho 59-171070).

As shown in Figures 7 and 8, this is the head cylinder (1
1), a sub-chassis (2) that is slidably disposed on the main chassis (1) and moves toward and away from the head cylinder (11) in response to mode switching; 2) a cassette holder (3) supported by a link (5) so as to be movable up and down;

In the eject mode shown in FIG. 7, the sub-chassis (2) protrudes from the main chassis (1) and the cassette holder (3) rises. In the play mode shown in FIG. 8, the cassette holder (3) is lowered and housed in the sub-chassis (2), and the sub-chassis slides toward the head cylinder (11), reducing the depth of the apparatus.

(Problems to be Solved by the Invention) In the above magnetic recording and reproducing device, there is no specific disclosure of a means for locking the cassette holder (3) in a state accommodated in the sub-chassis (2) and a means for releasing the lock. .

If it is a magnetic recording/reproducing device in which the depth of the device does not change even when the mode is switched, the cassette holder only moves up and down and does not move back and forth, so the locking and unlocking means for the holder can be simple. As mentioned above, in the case where the holder (3) moves up and down and moves back and forth together with the sub-chassis (2), a dedicated drive source is required for locking and unlocking, making the device configuration complicated. .

The present invention provides a locking and unlocking device for a cassette holder, which has a simple structure and can be automatically locked simply by lowering the holder and can be unlocked by sliding the sub-chassis.

(Means for Solving the Problems) In order to achieve the above object, the cassette holder locking and unlocking device of the present invention includes a holder (3) having a locking plate (5) pivotable in a vertical plane. The lock plate (5) is placed in contact with a stopper (54) on the holder and held by a spring (55) so that upward rotation toward the head cylinder (11) rM is permitted but reverse rotation is prevented. It is biased to the side and held downward. The lock plate (5) is attached to the link (4) that supports the cassette holder (3).
) is provided with a protruding lock arm (6) that can be engaged with the lock plate (5) toward the head cylinder (11).

The main chassis (1) is provided with a lock release piece (7) that can be retracted from the transition path of the lock plate (5) when the holder (3) moves toward the head cylinder (11). 7) is biased by a spring (72) in the direction of exiting the lock plate (5) to the transition path, and when the lock plate (5) moves forward toward the head cylinder (11), the release piece (7) is biased by the spring (72). 72) is pushed by the lock plate (5) and the lock plate (
5) When the sub-chassis (2) moves backward, the lock plate (5) is caught by the release piece (7) and rotated in the unlocking direction.

(Operations and Effects) In the eject mode, the holder (3) is raised by a spring bias, and a cassette can be inserted.

When the holder (3) is pushed down against the spring (47),
The lock plate (5) also moves down together with the holder (3).

As the holder (3) descends, the link (4) supporting the holder (3) collapses, and the lock arm (6) protruding from the link pushes the lock plate (5) on its way down against the spring (55). While pushing toward the head cylinder (11) side, engage with the hook part (52) of the lock plate (5) and remove the holder (3).
lock in the lowered position.

In this state, the subchassis (2) is connected to the head cylinder (11).
) side and stop at the playing position.

When the sub-chassis (2) moves forward, the free end of the lock plate (5) hits the release piece (7) on the main chassis (1), but the lock plate (5) is stopped by the stopper (54) so that the head cylinder <11 ), and the lock plate (5) is prevented from rotating away from the release piece (7) against the spring (72).
) and climb over the release piece (7).

Therefore, there is no problem in the advancement of the subchassis (2), and the subchassis (2) advances to the play position while housing the holder (3).

When switched to eject mode, the subchassis (2) retreats in a direction away from the head cylinder (11). On the way back, the lock plate (5) hits the release piece (7) and rotates toward the head cylinder (11), causing the lock plate (5) to engage with the lock arm (6). It comes off and the cassette holder (3) rises due to the spring force.

As mentioned above, simply pushing the cassette holder (3) downward locks the cassette holder (3) to the sub-chassis (2), and the lock is automatically released during eject operation, so the cassette holder (3) No special power source is required to lock and unlock.

(Embodiment) As shown in FIGS. 7 and 8, a magnetic recording and reproducing device includes a main chassis (1) equipped with a head cylinder (11),
A sub-chassis (2) that is slidably disposed on the main chassis (1) and moves toward and away from the head cylinder (11) according to mode switching, and a cassette holder that is movably disposed on the sub-chassis (2). (3).

The sub-chassis (2) is slidably driven by a drive device (not shown) provided in the main chassis (1), and in the embodiment, the sub-chassis (2) is in the eject position as shown in FIG. 7 and in the play position as shown in FIG. It stops at three positions: the position and the empty position shown by the two-dot chain line E in FIG.

The empty position is when the subchassis (2) is in an empty state with no cassette loaded in the cassette holder (3).
) is a position close to the head cylinder (11) side beyond the play position.

In the following description, "front" refers to a direction approaching the head cylinder (11), and "rear" refers to a direction away from the head cylinder (11).

As shown in FIG. 1, a cassette holder (3) is disposed at the rear of the sub-chassis (2) via a link (5) so as to be movable up and down.

The link (5) pivots at the center of each of the two link plates (41) and (44).
41) One end of (44) is pivotally connected (42) L to the sub-chassis (2), the other end supports a roller (43), and the roller is mounted on the side wall (31) of the holder (3). It is removably fitted into the guide hole (32).

One end of the other link plate (44) was pivotally connected (45) L to the holder (3), and the other end supported a roller (43), which was installed in the side wall (21) of the subchassis (2). It is fitted into a horizontally long guide hole (22) so that it can be transferred.

FIG. 1 is a view of the holder (3) and sub-chassis (2) viewed from one side wall, and links similar to those described above are provided on the opposite side.

A tension spring (47) is stretched between the ends of both link plates (41, 44) on the holder (3) side, and the link plate (4) is biased by the spring in the direction of raising the holder (3). ing.

A link plate (41) whose one end is pivotally connected (42) to the sub-chassis (2) is connected to the lock arm 1 (6) from the pivotally connected portion.
) is provided protrudingly, and the lock arm (6) is provided with a link plate (
The link plate (41) extends slightly downward from the extension line of the link plate (41), and rotates together with the link plate (41).

A hanging pin (61) is provided at the tip of the lock arm (6) and protrudes outward perpendicular to the thrust direction of the sub-chassis (2).

The hanging bottle (61) engages with and disengages from a hanging portion (52) of a lock plate (5), which will be described later.

A lock plate (5) is rotatably supported in a vertical plane by a pivot (51) at the front of the side wall (31) of the holder (3).

The lock plate (5) is in a downward position and is urged backward by a spring (55), and the rear edge of the lock plate (5) hits a stopper (54) protruding from the holder (3), causing it to move backward. Rotation to is blocked.

Cut out the center of the rear edge of the lock plate (5) and
) is formed on the free end of the lock plate (5), and a hit bottle (
53) are provided perpendicularly within the rotation plane of the lock plate (5) and protrude outward.

The hook pin (61) of the lock arm (6) is engaged with and disengaged from the above-mentioned hook portion (52), and the hit bottle is engaged with and disengaged from a release piece (7) to be described later.

As shown in Figures 1 and 6, in the main chassis (1), a lock release piece (7) is arranged slightly in front of the elevating position of the cassette holder (3) at the eject position so as to be rotatable in a vertical plane. has been done.

The release piece (7) has its rear end attached to the side wall (1) of the main chassis (1).
2), and its front end is biased upward by a torsion spring (72) and abuts against a stopper (74).

The front end (73) of the release piece (7) is attached to the sub-chassis (2).
) is exposed in the transition path of the lock plate (5) and the hit bottle (53) when the lock plate (5) moves forward.

However, in the eject mode, the holder (3) is raised by the spring force, and the cassette can be inserted (FIG. 1).

When the holder (3) is pushed down against the spring (47),
The lock plate (5) also moves down together with the holder (3).

As the holder (3) descends, the link (4) supporting the holder (3) collapses, and the hanging bottle (61) of the lock arm (6) protruding from the link hits the lock plate (5) on the way down.
) is pushed toward the head cylinder (11) against the spring (55), hooks onto the hook (52) of the lock plate (5), engages with the lock plate (5), and locks the holder (3). Lock in the lowered position (Figure 2).

In this state, the subchassis (2) is connected to the head cylinder (11).
) side and stops at the play position (if the cassette is not loaded, it will advance further to the empty position indicated by the two-dot chain line in Figure 8).

When the sub-chassis (2) moves forward, the hit pin (53) at the free end of the lock plate (5) hits the release piece (7) on the main chassis (1), but the lock plate (5) does not hit the stopper ( 5
4) prevents rotation in the direction away from the head cylinder (11), and the release piece (7) is held against the spring (72).
(Figures 3 and 4).

When switched to eject mode, the sub-chassis (2) retreats in the direction away from the head cylinder (11), and during the retreat, the lock plate (5) hits the pin (53) and releases the release piece (7).
) (Figure 5).

Since the upward movement of the release piece (7) is restricted by the stopper (74), the hit bottle (53) is caught on the release piece (7), causing the lock plate (5) to rotate forward.
The lock plate (5) and the lock arm (6) are disengaged, and the cassette holder (3) is raised by the spring force.

As mentioned above, simply pushing the cassette holder (3) downward locks the holder (3) to the subchassis (2), and the lock is automatically released during the eject operation, so the holder (3) is locked. Moreover, no special power source is required to release the lock.

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a side view of the magnetic recording/reproducing device in the ejected state with the main chassis broken, Figure 2 is a side view of the same holder as shown above with the holder pressed down, and Figure 3 is a side view of the lock plate being released when the sub-chassis moves forward. Side view passing through the piece, 4th
The figure is a side view in the play position, Figure 5 is a side view showing the situation where the lock is released when the subchassis is retracted, and Figure 6 is a side view showing the situation where the lock is released when the subchassis is retracted.
The figure is a perspective view of the lock plate, release piece, and lock arm.
The figure is a perspective view of the magnetic recording/reproducing device in the ejected state.
The figure is a perspective view of the magnetic recording/reproducing device in a playing state. (1) Main chassis (2) Sub chassis (3) Holder (4) Link (
5)...Lock plate (6)...Lock arm ())...Release piece

Claims (1)

[Claims] [1] A main chassis (1) equipped with a head cylinder (11), and a main chassis (1) that is slidably disposed on the main chassis (1) and that is configured to move the head cylinder (11) according to mode switching.
); a cassette holder (3) disposed on the subchassis (2) so as to be movable up and down via a link (4) and biased in an upward direction by a spring (47); A lock plate (5) is rotatably supported on the holder (3) in a vertical plane,
The lock plate (5) is placed against a stopper (54) on the holder and attached to the stopper side by a spring (55) so that upward rotation toward the head cylinder (11) is allowed but reverse rotation is prevented. The lock plate (5) is attached to a hook part (52) formed on the lock plate (5) on the link (4) which is forced and held downward and supports the cassette holder (3).
A lock arm (6) that can be engaged from the direction of pushing the main chassis (1) toward the head cylinder (11) is protruding from the main chassis (1).
is provided with a lock release piece (7) that can be retracted from the transition path of the lock plate (5) when the holder (3) moves toward the head cylinder (11), and the release piece (7) is supported by a spring ( 72
), and when the lock plate (5) moves forward toward the head cylinder (11), the release piece (7) is pushed against the spring (72). When the sub-chassis (2) is pushed by the lock plate (5) and comes off the transition path of the lock plate (5), the lock plate (5)
A locking and unlocking device for a cassette holder, characterized in that it is hooked on a release piece (7) and rotated in the unlocking direction.