JPS6127832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus that pulls out a magnetic tape from a tape cassette containing a magnetic tape using a tape pull-out pin and brings it into contact with a magnetic head to record or reproduce signals.
The structure is designed to prevent unnecessarily strong tension from being applied to the magnetic tape when pulling out the tape from the tape cassette or storing the tape, and also to prevent the tape reel from rotating due to inertia and causing slack in the pulled out magnetic tape when the tape is drawn out. The structure is designed to prevent this from occurring.

An embodiment of the present invention will be described below with reference to the drawings, taking a helical scan type rotary head type magnetic recording and reproducing apparatus as an example.

In the drawing, 1 is a cylindrical head cylinder with two rotating heads inside;
Reference numerals a and 2b are guide grooves provided on both sides of the head cylinder 1 for guiding the tape pull-out pin.

3a and 3b are tape pull-out pin stands slidably engaged with the guide grooves 2a and 2b, and tape pull-out pins 4a, 5a, 4b, and 5b are respectively attached to both tape pull-out pin stands 3a and 3b. It is planted.

Both tape pull-out pin stands 3a, 3b are configured as described in, for example, Japanese Patent Application Laid-Open No. 52-134410, and as the rotation ring 6 rotates, the guide grooves 2a, 2
It is configured to be slidable in both forward and reverse directions along the direction b.

7 has a tape tension control pin 8 at one end, and the other end is rotatably connected to the chassis 1 by a rotation shaft 9.
This is a tension lever attached to 0.

This tension lever 7 is always urged to rotate counterclockwise by a spring 12.

However, in the state shown in FIG. 1 before the tape is pulled out, the tension lever 7 is in contact with the tape pull-out pin stand 3a, and its rotational position is restricted.

Reference numerals 13 and 14 denote a tape supply reel stand and a tape take-up reel stand, and 15 has one end fixed to the tension lever 7, and the other end fixed to the chassis 10 while being wound around the supply reel stand 13 approximately half a turn. This is a brake band for tape tension control.

Note that when the tension lever 7 is positioned in the state shown in FIG. 1, the contact relationship between the brake band 15 and the reel stand 13 is small, and no particular rotational load is applied to the reel stand 13.

As shown in FIG. 3, a rotary cam 20 is rotatably provided on the back surface of the chassis 10 about a shaft 21, and is urged to rotate counterclockwise by a spring 22.

In the state before the tape is drawn out (the state shown in FIG. 1), the engaging claw 23 of the rotating cam 20 abuts the stopper pin 24, and its rotating position is restricted, and the engagement claw 23 of the rotating cam 20 is regulated. The tip of the claw 23 is
It is located on the rotation ring 6 (see FIG. 3).

25 is rotatable around the shaft 21, and
It is a rotating body that is frictionally engaged with the rotating cam 20.

An engagement pin 27 is implanted in the arm 26 fixed to the rotating body 25.
passes through a through hole 28 provided in the chassis 10 and projects onto the surface of the chassis 10.

Now, in the state shown in Figures 1 and 3, after installing the tape cassette (indicated by the two-dot chain line in Figure 1),
When the rotation ring 6 is rotated counterclockwise by a drive source (not shown) such as a motor, the tape pull-out pin stands 3a and 3b start moving in the directions of the arrows.

By this movement of the tape pull-out pin stands 3a, 3b, the tape pull-out pins 4a, 5a, 4 are removed from inside the cassette.
The magnetic tape is sequentially pulled out by means b and 5b.

As the tape pull-out pin stand 3a moves, the tape pull-out pin stand 3a and the tension lever 7 are disengaged, and the tension lever 7 also springs 1.
However, the arm 29 provided on the tension lever 7 comes into contact with the engagement pin 27 protruding from the through hole 28, and the rotation is prevented. be prevented.

Therefore, the tension lever 7 is held approximately at the position shown in FIG.
Since no braking force is applied to the tape 3 by the brake band 15, the supply reel table rotates with a low load and the tape is drawn out from the cassette with low tension.

The pull-out pin stand 3a advances further from this state, and when the tape loading is near the end position, the protrusion 30 provided on the rotary ring 6 comes into contact with the engaging claw 23 of the rotary cam 20, and from then on, As the rotation ring 6 rotates, the rotation cam 20 begins to rotate clockwise against the force of the spring 22.

As the rotating cam 20 rotates, the rotating body 25
The engagement pin 27 also rotates clockwise due to the frictional engagement force, and the engagement pin 27 also rotates along the through hole 28.

As the engagement pin 27 moves, the tension lever 7 is sequentially rotated counterclockwise by the force of the spring 12, and the brake band 15 begins to apply a braking force to the supply reel stand 13.

When the tape pull-out pin base 3a moves further from this state (the rotating ring 6 rotates), the rotating cam 2
0 also rotates, but the engagement pin 27 abuts the end of the through hole 28 and is prevented from moving, so that the rotating body 25 is prevented from rotating.

Therefore, for some period after that, the rotating cam 20
rotates, but the rotating body 25 is held in that position.

Then, the tape pull-out pins 4a and 4b are moved until they respectively abut against the stopper 31, and the tape pull-out operation is completed.

FIG. 2 shows the state at the end of this tape drawing operation.

Next, the operation when storing the tape will be explained.

When the rotating ring 6 is rotated clockwise from the state shown in FIG. 2, the tape pull-out pins 3a and 3b begin to move toward the tape cassette.

Further, as the rotation ring 6 rotates clockwise, the protrusion 30 on the rotation ring 6 also moves clockwise, so the rotation cam 20 also rotates counterclockwise due to the force of the spring 22.

Due to this rotation of the rotation cam 20, the rotation body 25 also rotates counterclockwise, and the engagement pin 27 is moved to the arm 29.
Press to rotate the tension arm 7 clockwise.

That is, the tension arm 7 is rotated in a direction in which the braking force of the supply reel stand 13 by the brake band 15 is removed.

When storing this tape, supply reel stand 1
3 is rotationally driven in the tape winding direction by a drive source (not shown).

Thereafter, the rotating ring 6 continues to rotate until it reaches the states shown in FIGS. 1 and 3, and the tape storage operation is completed.

As described above, the present invention reduces the braking load on the tape supply reel stand until near the end point of the tape pull-out operation when the tape is pulled out from the tape cassette by the tape pull-out pin. In addition to reducing the tape tension that sometimes occurs, a braking load is automatically applied to the tape supply reel stand near the end of the tape pull-out operation, and the inertia during the tape pull-out operation causes the tape supply reel stand to maintain its position even after the tape pull-out operation is completed. This is intended to prevent the tape from becoming slack when rotated and pulled out.

Furthermore, during tape storage, the braking force applied to the tape supply reel stand that performs the tape winding operation is reduced from the beginning of the tape storage operation.

That is, in the present invention, the first rotating body (rotating cam 20) is driven by the moving body (rotating ring 6) that drives the tape pull-out pin, and the tape is rotated by being frictionally engaged with the first rotating body. Since the rotation position of the tension arm is controlled by the rotation of the second rotating body 225, the tape pull-out pin applies braking force to the reel stand near the final position, and when storing the tape, the tape is pulled out from the final position. As soon as the pin is released, the braking force can be reduced.

Therefore, good operation can be expected without unnecessary tension being applied to the tape and without causing slack in the tape both when drawing out the tape and when storing the tape.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main part showing the tape storage state in an embodiment of the present invention, Fig. 2 is a plan view of the main part showing the same tape withdrawal completed state, and Fig. 3 shows the rotary cam in the tape storage state. FIG. 1...Head cylinder, 4a, 4b, 5a, 5
b... Tape pull-out pin, 6... Rotating ring, 1
3... Tape supply reel, 7... Tension lever, 15... Brake band, 20... Rotating cam, 25... Rotating body, 27... Engaging pin, 28...
...Through hole, 29...Lever.

Claims (1)

[Claims] 1 A moving body that moves reversibly between a first position and a second position by a drive source, and as the moving body moves, a magnetic tape is moved from a third position in a tape cassette containing the magnetic tape. a tape pull-out pin that is reversibly movable to a fourth position in which the tape is pulled out from the tape cassette and brought into contact with a magnetic head; a tension arm that applies a braking force to the supply reel stand in accordance with the movement position thereof so as to maximize the braking force, and a first biasing means that elastically biases the tension arm in the direction of the sixth position; The tape pull-out pin is reversibly rotatable between a seventh position and an eighth position, and is elastically biased in the direction of the eighth position by a second biasing means, and the tape pull-out pin is reversibly rotated between a seventh position and an eighth position. a first rotating body that engages with the movable body when approaching the vicinity of the fourth position, and is moved together with the movable body to the seventh position against the biasing force of the second biasing means; and,
is frictionally engaged with the first rotating body, rotates between a ninth position and a tenth position in conjunction with the rotation of the first rotating body, and is in contact with the tension arm. a second tension arm that is in contact with the tension arm and that restricts the position of the tension arm against the first biasing means depending on the rotational position of the tension arm;
A magnetic recording and reproducing device consisting of a rotating body.