JPS6052492B2 - Cassette loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette mounting device in a magnetic recording and reproducing device, and the present invention relates to a device for mounting a tape cassette in a magnetic recording and reproducing device. By creating a difference in the return force of the tape cassette mounting device when the device is tilted 90 degrees and used perpendicular to the ground, the tape cassette mounting device is configured to always return stably. .

Conventionally, tape cassette mounting devices first mount the tape cassette on a cassette stand that is always urged away from the reel axis, and then move the cassette stand towards the reel axis against the urging force. In some cases, the tape cassette and reel shaft are engaged with each other. When the tape cassette is removed, the reel stand is automatically moved away from the reel shaft by the biasing force. On the other hand, in a device such as a portable VTR, which has two usage modes, such as when used on a desk and when used over the shoulder, the posture of the device in use is 900 different, as described above. When a tape cassette loading device is used, the following problems occur.

When the cassette stand is moved in the direction of gravity, such as when placed on a desk, the full weight of the cassette is applied to return the cassette stand, so a relatively large return force is required to overcome this. Requires.

However, when the same device is used at an angle of 900 degrees, returning the cassette stand does not require as much returning force as in the former case. Conventionally, a return force sufficient to move the cassette in the direction of gravity was applied to the cassette stand, so when the cassette was moved laterally, a return force greater than necessary was applied, resulting in a sudden return. However, there was a problem in that the winding state of the tape in the tape cassette changed due to impact.

This is particularly a problem in tape cassettes that are relatively heavy, such as VTRs.

The present invention solves this problem and is configured to automatically adjust the return force depending on the usage conditions.

One embodiment will be described below with reference to the drawings.
In the drawing, 1 is a force setting table, and 2 and 3 are levers rotatably connected to each other by a support pin 4 at their intermediate portions.

One end of this lever 3 is rotatably supported by a shaft 6 on a side plate 5 fixed to the base plate of the device, and the other end is slidably connected to the force setting table 1 by a pin 7.

A guide pin 8 provided at one end of the other lever 2 is supported so as to be slidable along a through hole 9 provided in the side plate 5.
The other end is rotatably connected to the force setting table 1 by a pin 10.

Reference numeral 11 denotes a return spring stretched between the levers 3 and 2, and the above structure is the same as that of a conventional cassette mounting device of this type.

That is, after placing the tape cassette 12 on the force setting table 1 in the direction of the arrow, the levers 2 and 3 are rotated against the force of the spring 11 by pressing from above, and the force setting table 1 is placed on the reel shaft. 13'', and the force setting table 1 is locked at that moving position by a locking means (not shown).

When this locking means is released, the return spring 1
1 causes the force setting table to return to its original state.

In the above configuration, the force setting table 1 always returns using the return spring 1.
Since it depends only on the force of 1, the above-mentioned problem occurs.
In the present invention, this problem is solved by adding the following configuration.

Reference numeral 13 designates an L-shaped lever supported by the side plate 5 so as to be rotatable about a pin 14, and is constantly urged to rotate counterclockwise by a spring 15.

Reference numeral 16 denotes a stopper for regulating its rotational position.

17 is the pin 18 at the other end of the L-shaped lever 13! The engagement lever is rotatably supported and has an engagement step 19 at its tip that engages with the spindle pin 4.

The clockwise rotational position of the engagement lever 17 is regulated by the support shaft pin 4, and the counterclockwise rotational position is regulated by a stopper 20.

Further, the position of the stopper 20 is configured such that when the engagement lever 17 comes into contact with the stopper 20, the engagement step portion 19 separates from the support shaft pin 17.

Next, this operation will be explained.

First, the case where the device is placed on a desk and used will be described.

Figure 2 shows the condition before the force setting table is lowered.

That is, the engagement lever 17 is in contact with the stopper 20 due to the weight of its tip. FIG. 3 shows the force setting table 1 lowered from this state.

l Even in this downward drop state, the engagement step portion 19 of the engagement lever 19 is sufficiently separated from the support shaft pin 4.

Therefore, if the lock (not shown) is released in this state,
The force setting table 1 returns upward by the force of the return spring 11. This operation is the same as in conventional devices of this type.

Next, the second state will be explained. FIG. 4 shows the state before the force setting table is lowered, and the engagement lever 17 is separated from the stopper 20 due to its own weight at its tip and is in contact with the support shaft pin 4.

FIG. 5 shows a state in which the force setting table 1 is pressed and moved in the direction of the arrow from this state.

That is, the engagement step portion 19 of the engagement lever 17 and the support shaft pin 4
are in an engagement relationship.

When the lock is released from the state shown in FIG. Since the portion 19 and the support shaft pin 4 are engaged, the L-shaped lever 13 is also rotated clockwise.

For the clockwise rotation of this L-shaped lever 13, it is necessary to rotate it against the spring 15. Therefore, the substantial return force of the force setting table 1 is determined from the return force of the return spring 11.
5 minus the force to stretch it.

FIG. 6 shows the return completion state.

As described above, according to the present invention, when the return force of the force setting table is small and the force setting table is used in the left and right direction (the use condition in which the force setting table is moved in a direction perpendicular to the ground surface), the force setting table is In order to substantially reduce the return force of the force setting table by engaging the interlocking protrusion with a spring for reducing the return force, a friction brake is used as disclosed in JP-A-50-151124. Compared to products that reduce the return force, this system does not cause unstable operation due to aging due to wear of the brake shoe, abnormal reduction in braking force due to oil and dirt build-up, and allows the force set to be attached and detached stably over a long period of time. It can be done smoothly and reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIGS. 2 to 6
The figures are side views of main parts in each operating state.

Claims (1)

[Claims] 1. A cassette stand on which a tape cassette is placed, a cassette stand moving means that supports the cassette stand so that it can move towards and away from the reel shaft, and a constant return force that moves the cassette stand in a direction away from the reel axis. a first spring that applies the force to the cassette table moving means, a protrusion provided on the cassette table moving means, a lever whose rotational position is regulated by the direction in which gravity is applied, and one end of which is fixed to the lever. and a second spring, and when the direction in which the cassette stand is separated from the reel axis is in the left-right direction, the lever engages with the protrusion, and the second spring causes the first spring to move away from the reel axis. A cassette mounting device characterized by being configured to reduce the return force of a cassette stand.