JPH0423336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette loading mechanism that uses a drive mechanism to transport and mount a cassette inserted from the front side of a magnetic recording/reproducing device.

[Background technology and its problems]

There is a cassette loading mechanism that operates a drive mechanism by inserting a cassette from the front side of a magnetic recording/reproducing apparatus during recording or reproduction to transport and mount the cassette. Such a cassette loading mechanism pushes the cassette a predetermined stroke,
Since the drive mechanism is actuated by insertion, a limiter mechanism is provided as a part of the drive mechanism to absorb the pressing force of the cassette.

Fig. 1 is a plan view schematically showing a conventional cassette loading mechanism that has the above effects, Fig. 2 is a right side view of Fig. 1, and Fig. 3 is a front view of Fig. 1. . Note that the drive mechanism is not shown in FIG. 3.

In these figures, 1 is a top plate, and 3L and 3R are side plates attached to the left and right sides of the top plate 1, each having an L-shaped hole 4. Note that three holes 4 are normally provided for mounting the cassette C, but only one hole is shown in FIG.

Reference numeral 5 denotes a base into which the cassette C is inserted, and pins 6L and 6R provided on both sides are connected to holes 4 in the side plates 3L and 3R.
and is supported by the side plates 3L and 3R.

7L, 7R are provided with long holes 8L, 8R into which the pins 6L, 6R are loosely fitted, and are rotary arms that rotate as the pins 6L, 6R move; 9 is the rotary arm 7;
11 is a limiter gear that meshes with the transmission gear 10; 12 is a limiter spring having one end fixed to the limiter gear 11 and the other end fixed to the limiter gear 13; 14, a limiter spring; A worm wheel 15 meshes with the limiter gear 13, a worm gear 15 meshes with the worm wheel 14, a belt 16 transmits the rotational force of a motor (not shown) to the worm gear 15, and a switch 17 operated by the rotation arm 7R. This is what starts the .

Next, the operation of the cassette loading mechanism constructed as described above will be explained.

When the cassette C is pressed and inserted into the base 5 in the direction of the arrow in FIG. Gear 9, transmission gear 1
0 and the limiter gear 11 rotate in the direction of the arrow in FIG. At this time, worm gear 15
Since the motor that rotates is not activated, limiter gear 13, worm wheel 14, and worm gear 15 do not rotate. Therefore, the limiter spring 12 between the limiter gears 11 and 13 rotates, and a rotational force (a force for causing the cassette C to pop out when the cassette C is ejected) is accumulated in the limiter spring 12.

When the rotating arms 7L and 7R rotate to operate the switch 17, the motor starts and the belt 16 rotates the worm gear 15, worm wheel 14, and limiter gear 13 in the direction of the arrow in FIG. . Therefore, after releasing the rotational force accumulated in the limiter spring 12, the limiter gear 11 is released via the limiter spring 12.
Since the rotating arms 7L and 7R rotate, the base 5 also moves to transport and mount the cassette C.

Since the conventional cassette loading mechanism operates as described above, the pressing force upon insertion of the cassette C is transmitted to the limiter gear 13 engaged with the worm wheel 14. In this case, usually 800g
There is no problem if the cassette C is pressed with less than a certain amount of pressing force, but if the cassette C is pressed with an excessive force, this force is directly applied to each component up to the limiter gear 13, the shaft, etc. Therefore, especially when each part is made of plastic etc., parts etc. may be deformed or
There is a risk of damage. Furthermore, even if no parts are damaged, the pins 6L, 6R and the rotating arms 7L, 7R will be bent to each other, as shown by the two-dot chain lines in Figures 1 and 3, and the engagement will be released. There's a problem.

In order to solve this problem, each component may be made of metal. However, there is a problem that it is expensive.

[Purpose of the invention]

This invention was made in view of the above points, and when a cassette is inserted with a pressing force of more than a predetermined value, the rotating arm bends and collides with the stopper.
The present invention provides a cassette loading mechanism that does not apply force that would cause deformation or damage to each component to the drive mechanism, and that can be achieved with an inexpensive configuration.

[Summary of the invention]

In order to achieve the above-mentioned intended purpose, this invention extends a part of the top plate to form a stopper part,
The stopper portion is configured to abut against the deflection of the rotating arm.

〔Example〕

4 is a plan view schematically showing an embodiment of the present invention, FIG. 5 is a right side view of FIG. 4, and FIG. 6 is a front view of FIG. 4. Note that the drive mechanism is not shown in FIG. 6.

In these figures, 2L and 2R are the top plate 1
This is a stopper part formed by extending a part of.
Note that other symbols indicate the same parts as in FIGS. 1 to 3.

Next, the differences between the cassette loading mechanism of the present invention and the conventional example will be explained.

If the cassette C is pressed and inserted into the base 5 with excessive force, the rotating arms 7L and 7R will close to the pins 6L and 6R.
The pins 6L, 6R and the rotating arms 7L,
7R is bent as shown by the two-dot chain line in FIG. 4 and FIG.
7R collides. Therefore, even if the cassette C is pressed with more force than this, the base 5 and the rotating arms 7L and 7R do not move, so the rotating arm 7
The force that causes L and 7R to collide with the stoppers 2L and 2R will not be transmitted to the drive mechanism, resulting in damage to parts, etc.
Protected from deformation. In addition, the stopper portions 2L, 2
Since R is formed by extending a part of the top plate 1, the price remains the same as before.

In addition, when the rotating arms 7L, 7R are pressed against the stopper parts 2L, 2R as described above, if the cassette C is further pressed, the rotating arms 7L, 7R will bend further outward, causing the contact with the stopper parts 2L, 2R. However, as shown in Fig. 7, the guide part 2R r (2L l) is integrated with the stopper part _2R (2L ₎ .
If this is done, the rotating arms 7L, 7R will abut against the stopper portions 2L, 2R, and the abutment between the pins 6L, 6R and the rotating arms 7L, 7R will never come loose.

In addition, since the rotation arms 7L, 7R that abut against the stopper portions 2L, 2R are released from being held in the state shown by the two-dot chain line in FIGS. 4 and 6 by operating the drive mechanism, the conventional Similarly, if cassette C is not loaded even after a predetermined period of time has elapsed since the switch 17 is activated, that is, a time slightly longer than the time required to transport and load cassette C, the control circuit reverses the motor and removes the cassette. The drive mechanism may be operated to discharge C to ensure safety.

〔Effect of the invention〕

As explained above, in the cassette loading mechanism of the present invention, the stopper part is formed by extending a part of the top plate, so even if the cassette is inserted into the base with a pressing force of more than a predetermined value, the rotating arm will not move. It bends and collides with the stopper part, and the force is not transmitted to the drive mechanism.
It is possible to prevent the drive mechanism from being deformed or damaged. Further, since the stopper part is formed by extending a part of the top plate, there is an advantage that it can be constructed at the same price as the conventional one.

[Brief explanation of drawings]

Fig. 1 is a plan view schematically showing a conventional cassette loading mechanism, Fig. 2 is a right side view of Fig. 1, Fig. 3 is a front view of Fig. 1, and Fig. 4 is an embodiment of the present invention. 5 is a right side view of FIG. 4, FIG. 6 is a front view of FIG. 4, and FIG. 7 is a partial perspective view showing another embodiment of the present invention. In the figure, C is the cassette, 1 is the top plate, 2L, 2R are the stopper parts, 2L _l , 2R _r are the guide parts, 3L, 3R
is the side plate, 4 is the hole, 5 is the base, 6L, 6R are the pins,
7L, 7R are rotating arms, 8L, 8R are long holes, 1
1 and 13 are limiter gears, 12 is a limiter spring, 14 is a worm wheel, 15 is a worm gear, 16 is a belt, and 17 is a switch.

Claims (1)

[Claims] 1. A top plate, a side plate with an L-shaped hole attached to the top plate, a base supported by the side plate with a pin inserted into the hole, and In a cassette loading mechanism comprising a rotating arm that rotates and a drive mechanism that drives the rotating arm, a part of the top plate is extended to form a stopper part, and the stopper part is connected to the rotating arm. A cassette loading mechanism configured to abut against deflection of the cassette loading mechanism.