JPS6331239Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette holder locking mechanism in a magnetic recording/reproducing apparatus. In a magnetic recording/reproducing device, such as a cassette-type VTR, after a cassette is attached to a cassette holder, the cassette holder is pushed into the cassette holder lock position, the cassette holder is locked at this position, and the loading switch is energized. A signal is sent to the drive system of the tape mounting means to start loading. However, in the conventional cassette holder locking mechanism of this type of magnetic recording/reproducing device, the locking of the cassette holder and the energization of the loading switch are performed independently, so even if the cassette holder reaches the lock position, it cannot be fully pushed in. If not, the cassette holder may not be locked and only the loading switch may be energized. In this case, since loading is started before the cassette holder is locked, there is a risk that the tape will not be loaded properly and the tape may be damaged or tangled. This invention was made in view of the above points,
To provide a cassette holder locking mechanism in which the loading switch is not energized until the cassette holder is securely locked by configuring the loading switch to be energized after the cassette holder is completely locked. An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view of the mechanism of the present invention, and Fig. 2 is an exploded perspective view of the mechanism. An engagement lever 1b having a roller 1a is provided. 2 is a base fixed on the chassis and has a square hole 2a and a first support shaft 2b; 3 is a lock lever that engages with the engagement roller 1a to lock the cassette holder 1; , and includes an inclined surface 3b on which the engagement roller 1a slides, a recess 3c in which the engagement roller 1a engages, and a locking pin 3d. Further, the lock lever is urged to rotate counterclockwise by a torsion spring 4 attached to the second support shaft 3a. 5 is a loading switch which is energized together with the lock of the cassette holder; 6 is loosely fitted to the first support shaft 2b of the base body 2; a pressing piece 6a for pressing the loading switch 5 is provided at the bottom; A first slide lever includes a locking piece 6b that is locked by a locking pin 3d provided therein, a long hole 6d in the center into which a projecting piece 6c and a first support shaft 2b are loosely fitted; 7 is also the first support shaft. The second slide lever is provided with a long hole 7a that fits loosely into the second slide lever 2b, and a bent piece 7b in the center that abuts the protrusion 6c of the first slide lever, and is suspended between the second slide lever 6 and the first slide lever 6 . The projecting piece 6c and the bent piece 7b are engaged with each other while being biased in opposite directions by the spring 8 to be integrated. Reference numeral 9 denotes a coil spring which is inserted into the square hole 2a through which the slide levers 6 and 7 pass, and which urges the slide levers 6 and 7 upward. Next, the operation of the above-mentioned mechanism is explained in Figures 3 to 5.
This will be explained with reference to the figures. When the cassette holder 1 is pushed down from the cassette mounting position shown in FIG. 3, the engagement roller 1a descends while sliding against the inclined surface 3b of the lock lever 3 .
As shown in FIG. 4, the lock lever 3 has a torsion spring 4
The locking pin 3d rotates clockwise about the second support shaft 3a against the bias of the first slide lever 6, and the locking pin 3d comes into contact with the locking piece 6b of the first slide lever 6. At the same time, cassette holder 1
The bottom surface of the second slide lever 7 contacts the upper end of the second slide lever 7 to cause the lever to slide downward against the bias of the coil spring 9. The downward sliding of the second slide lever also forces the first slide lever 6 downward, but since the locking piece 6b is locked by the locking pin 3d, the downward sliding is prevented. regulated. When the cassette holder 1 is further pushed down, the engagement roller 1a is disengaged from the inclined surface 3b of the lock lever 3 and descends into the recess 3c. Then, the lock lever 3 rotates counterclockwise under the bias of the torsion spring 4, and the engagement roller 1a moves into the recess 3 as shown in FIG.
cassette holder 1 is locked. Further, by counterclockwise rotation of the lock lever 3 , the engagement between the locking pin 3d and the locking piece 6b of the first slide lever 6 is released, and the first slide lever 6 is pushed downward by the urging force of the spring 8. The lower end pressing piece 6a presses the loading switch 5. Therefore, the loading switch 5 becomes energized, and a signal is sent to the drive system (not shown) of the tape loading means to start loading. In this case, the loading switch 5 is energized after the cassette holder 1 is securely locked.
Loading is performed reliably and safely. Next, when releasing the cassette holder, the lock lever 3 is rotated clockwise by a lock release means (not shown) linked to the eject operation, and the engagement between the engagement roller 1a and the recess 3c is released. At the same time, the first and second slide levers 6 and 7 and the cassette holder 1 are pushed upward by the restoring force of the coil spring 9 and returned to the cassette mounting position. As mentioned above, according to the mechanism of the present invention, when the cassette holder is loaded, the loading switch is not energized until the cassette holder is securely locked. Safe and reliable loading can be performed without damaging or entangling the tape. Further, according to the present invention, the first and second slide levers are supported by a common first support shaft, and in the lock lever, the recess and the engagement pin are formed in the same direction when viewed from the second support shaft. This has the effect of requiring less space.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention.
The figure is a perspective view of the cassette holder locking mechanism, Fig. 2 is an exploded perspective view, Fig. 3 is a side view in the cassette mounting position, Fig. 4 is a side view when the cassette holder is being lowered, and Fig. 5 is in the cassette holder locking position. FIG. Explanation of main drawing numbers, 1 ...cassette holder, 3 ...
...Locking lever, 5...Loading switch,
6, 7 ...First and second slide levers.

Claims (1)

[Claims for Utility Model Registration] Magnetic recording in which a cassette is attached to a cassette holder in a first position, the cassette holder is locked in a second position, and a switch is energized to start tape loading. The playback device includes an engagement lever provided on the bottom surface of the cassette holder and having an engagement roller at the tip, a base body fixed on the chassis and having a first support shaft, and a second support shaft, the second support shaft being fixed to the chassis. A recess, an engagement pin, and an inclined surface are formed in the same direction in order from the nearest to the top, and are rotatably supported by the base body about the second support shaft, and the direction in which the engagement pin is separated from the first support shaft. a lock lever whose position is regulated against the urging so that the inclined surface is positioned in the path of the engagement roller; a pressing piece of the switch, the first support shaft and the second support; a first slide lever including a locking piece located between the shafts, guided and supported by the first support shaft, and entirely biased toward the cassette holder; a second slide lever that moves with the movement of the cassette holder and has a spring stretched between it and the first slide lever, and when the cassette holder moves from the first position to the second position, Due to the contact between the engagement roller and the inclined surface, the lock lever resists the force and moves to the first position.
The engaging pin is rotated toward the support shaft, and the engaging pin is positioned in the path of the engaging piece, thereby preventing the first slide lever from moving in conjunction with the movement of the second slide lever. , the cassette holder is the second
2. A cassette holder locking mechanism, characterized in that when the cassette holder is moved further toward the position and the engaging roller is fitted into the recess, the blocking is released.