JPS5921100B2 - 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 providing a difference in the return force of the tape cassette mounting device when the device is used at an angle of 900 degrees perpendicular to the ground, stable return of the tape cassette mounting device can always be expected.

Conventionally, tape cassette mounting devices first load the tape cassette onto 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. Some tape cassettes and reel shafts are brought into engagement by tightening the tape cassette.
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 differs by 900 degrees, 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 used on a desk, the full weight of the cassette is applied to the cassette stand's return, so a relatively large return is required to overcome this. Requires force.

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. In the past, sufficient return force was applied to the cassette stand to move it in the direction of gravity, so when the cassette table was used in a way that moved it laterally, more return force was applied than necessary, and as a result, the cassette table returned suddenly when it returned. There was a problem that the winding state of the tape in the tape cassette set changed due to impact. There is a problem in particular in tape cassettes such as TR, which are relatively heavy.

For this reason, conventionally, as shown in Japanese Patent Application Laid-open No. 151124/1983, when the force setting table is moved laterally (left and right), braking force is automatically applied using a brake switch. A structure in which the return force of the force setting table is weakened has been considered, but this structure has had problems such as aging of the brake shoe due to wear and a decrease in braking force due to adhesion of oil, dirt, etc.

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

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 connected to a side plate 6 fixed to the board 5 of the device.
It is rotatably supported by a shaft 7, and the other end is rotatably connected to the force setting table 1 by a pin 8.

Further, this lever 3 is constantly biased with a clockwise rotational force by a spring 9.

A pin 11 provided on the side plate 5 is slidably inserted into an elongated hole 10 provided at one end of the other lever 2, and a elongated hole 12 at the other end is slidably inserted into a pin 13 of the force setting table 1. Possibly engaged.

The above configuration is the same as that of a conventional force set mounting device of this type. That is, after placing the tape cassette 14 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 9 by pressing from above, and the force setting table 1 is placed on the reel shaft. 15, and at that moving position, the force setting table 1 is locked by a locking means (not shown).
(See Figure 3).

When this locking means is released, the force setting table 1 is returned to its original position by the return spring 9.

In the above configuration, the force setting table 1 is always returned by the return spring 9.
As mentioned above, it depends only on the force of . A problem arises.
In the present invention, this problem is solved by adding the following configuration.

Reference numeral 16 designates an L-shaped lever supported by a side plate 18 so as to be rotatable about a pin 17, and is constantly urged to rotate counterclockwise by a spring 19.

Reference numeral 20 denotes a stopper for regulating its rotational position.

Reference numeral 21 denotes an L-shaped engagement lever rotatably supported by a pin 22 at the other end of the L-shaped lever 16.

The clockwise rotational position of the engagement lever 21 is determined by the stopper 123, and the counterclockwise rotational position is determined by the stopper 12.
4. Also, the position of the stopper 23 is such that when the engagement lever 21 comes into contact with the stopper 23, the tip of the engagement lever 21 is positioned on the movement trajectory of the support shaft pin 4. is configured to do so.

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 21 is brought into contact with the stopper 23 due to the clockwise moment due to the weight of its end 21'. FIG. 3 shows the force setting table 1 lowered from this state.

That is, when the force setting table 1 is lowered from the state shown in FIG. 2, the spindle pin 4 comes into contact with the tip of the engagement lever 21, and when the force setting table 1 is further lowered in this contact state, an L-shape is formed. The shaped lever 16 is rotated against the force of the spring 19.

Therefore, when the locking means (not shown) is released in the state shown in FIG.
It returns upwards due to the force of.

Next, a second usage state in which the shaft is rotated by 90 degrees will be described. FIG. 4 shows the state before the force setting table 1 is lowered, and the engagement lever 21 is separated from the stopper 23 due to the force of the counterclockwise rotation moment due to its own weight, and the engagement lever 21 is separated from the stopper 23.
In other words, the tip of the engagement lever 21 is in a position away from the locus of movement of 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 force setting table 1 is locked in a state independent of the engagement lever 21 and the L-shaped lever 16.

Therefore, when the lock is released from this state, the force setting table 1 returns to its original position only by the force of the return spring 9.

As described above, according to the present invention, the restoring force is automatically applied in a usage state in which the force setting table requires more restoring force (a usage state in which the force setting table is moved in the direction of gravity), Since a brake is not used, there is no possibility of unstable splitting caused by abnormal reduction in braking force due to aging due to wear of the brake shoe, or due to adhesion of oil or dust. It can be done reliably.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view showing one embodiment of the present invention, and FIGS.
The figures are side views of main parts in each operating state. 1... Force setting table, 2, 3... Louver one
4...Spindle pin, 9...Return spring, 1
4...Tape cassette, 16...L-shaped lever 19...Spring, 21...Engagement lever.

Claims (1)

[Claims] 1. A cassette stand on which a tape cassette is placed, a first spring that applies a constant return force to the cassette stand in a direction away from the reel axis, and a cassette that supports the cassette stand so that it can move toward and away from the reel axis. a table moving means; a first lever rotatably biased in a certain direction by a second spring; and a second lever rotatably disposed on the first lever; Depending on the usage pattern of the device, if the direction in which the second lever moves away from the reel axis of the cassette stand is the vertical direction, the engaging portion provided on the second lever will move due to the weight of the second lever. If the direction away from the reel axis of the cassette stand is the left-right direction, the second
When the engaging portion is located at the first position, the engaging portion engages with the cassette base and the second spring is attached to the cassette base. adding the biasing force of to the biasing force of the first spring,
A cassette mounting device characterized in that the engaging portion and the cassette stand do not engage with each other when the engaging portion is located at the second position.