JPS6040999Y2 - Tape guide position regulating device in cassette VTR - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape guide position regulating device in a cassette VTR.

Generally, as a loading device for a cassette VTR, those shown in FIGS. 1 and 2 are known.

In FIG. 1, 1 is a cassette, and the cassette stores a magnetic tape 3 wound around reel hubs 2a and 2b.

This magnetic tape 3 can be pulled out from an opening on the front side 4 of the cassette 1, and FIG. 1 shows the magnetic tape 3 being pulled out and brought into contact with the circumferential surface of a cylindrical rotating head cylinder 5 having a rotating head. The condition is shown.

Reference numeral 6 denotes an erasing head, and 7 a head for audio and control signals, with which the drawn-out magnetic tape 3 is brought into contact.

8 is a capstan, 9 is a pinch roller, and the magnetic tape 3 is run at a constant speed by these.

Reference numeral 10.10' denotes a vertical draw-out pole, which is installed on separate arms 12.12' which are rotatably provided with respect to a base plate (not shown) using 11.11' as a fulcrum.

13.13' is a stopper fixed to the substrate,
The pole 10.10' is received at the tape extraction position.

14.14' is a tilt correction pole implanted in the arm 12.12'.

The rotation of the arms 12, 12' causes the pole 10.
10' is inside the notch shown by broken line 15 and 15' in cassette 1 (
By moving the tape 3 from the second position) to the stopper 13, 13' position (first position), the tape 3 is moved to the cassette 1.
It is pulled out from the cylinder 5 and comes into contact with the circumferential surface of the cylinder 5.

The above-mentioned pole 10.10' is the above-mentioned notch 15 of the cassette 1,
15', arm 1 is in the position schematically shown in Figure 2.
2.12' is located.

Arms 16 and 17 are respectively rotatably attached to the substrate with 18 and 19 as fulcrums, and each arm is connected to the arm 12 and 12' via a connecting rod 20.21.

22, 23, 24, and 25 indicate pivot points for this connection.

26 is a connecting rod rotatably attached to the connecting rod 20 and the arm 16 about the fulcrum 22;
This is a connecting rod rotatably attached to the arm 17 using 8 as a fulcrum.

When the connecting rod 26 is moved in the direction of the arrow, the connecting rod 20
The arm 12 is rotated clockwise via the pole 10.
rotates until it hits the stopper 13.

When the connecting rod 27 is moved in the direction of arrow B, the arm 17
is rotated clockwise, the arm 12' is rotated counterclockwise, and the pawl 10' hits the stopper 13'.

Reference numeral 30 denotes a tension arm, which is biased by a spring, and by the tension of the tape 3 guided by a post 31 implanted in the arm 30, the arm 30 is rotated against the spring. Depending on the movement, reel knob 1 but 2
The braking on the a side is controlled and the tension of the tape 3 is maintained approximately constant.

32 is an arm having a tape guide post 33;
It is provided so as to be rotatable around a fulcrum 34.

This arm 32 brings the tape 3 into contact with the erasing head 6, for example, and must remain at the position shown in the figure when the tape 3 is in contact with the peripheral surface of the cylinder 5 as shown in FIG.

Conventionally, the arm 32 and the like described above have been held in a predetermined position using a cam mechanism or a spring with a force greater than the tape tension.

By the way, the position regulating device using the above-mentioned cam mechanism has a drawback that it has a large number of parts and has a complicated configuration.

Also, if a spring with a force greater than the tape tension is used,
When the tape tension force becomes abnormally large, it becomes unstable, and the post 33 is biased by the spring in the direction of pulling out the tape 3 from the cassette 1. There is a risk that the tape 3 may be pulled out due to malfunction.

The present invention eliminates the above-mentioned drawbacks, makes the post 33 always receive the force of a weak spring that tries to return to the cassette 1 side, provides a mechanism to stop the post 33 that tries to return by the force of this spring, and has a simple structure. The present invention provides a tape guide position regulating device in a cassette VTR that can more reliably regulate the position of the post 33.

An embodiment of the present invention will be described in detail below with reference to FIG.

In Fig. 3, 5 is a cylinder, 10 is a vertical pull-out pole, 11 is a fulcrum, 12 is an arm, 13 is a stopper, 14
is a tilt correction pole, 32 is an arm, 33 is a post, 34
are the fulcrums, and these have the same effect as those in Figure 1.

Reference numeral 35 denotes a fixed base, to which the pole 10.14 is fixed, and the fixed base 35 is fixed to the arm 12 via an L-shaped mounting bracket 36 with screws.

The movable table has the other end of the arm 12 fixed to the fixed table 35 and moves between a first position where the arm 12 is close to the cylinder 5 and a second position which is the cassette mounting position. It is composed of the fixed base 35, arm 12, etc.

In FIG. 3, the first position of the movable table is shown by a solid line, and the second position is shown by a chain line.

A pin 37 is installed concentrically with the pole 10 on the lower side of the pole.

A first arm 38 is rotatably mounted around a fulcrum 39, and is biased clockwise by a first spring 40.

When the movable table is in the second position, the edge of the arm 38 is pressed against the pin 37 by a spring 40.

In the process of the moving table moving from the second position to the first position, the arm 38 follows the moving table and the spring 4
0, and the arm 38 is stopped at the position shown by the solid line when the edge of the arm 38 hits the stop piece 41.

The second arm 32 is biased clockwise by a second spring 42.

This spring 42 is sufficiently weaker than the spring 40 described above.

When the movable table is in the second position, the edge of the arm 32 is pressed against the fixed table 35 by the spring 42.

In the process of moving the movable base from the second position to the first position, the arm 32 is rotated by the movable base against the spring 42, and the fixed base 35 is rotated about the fulcrum 11. The arm 32 is released from the pressure exerted by the movable table when the locus of rotation about the fulcrum 34 of the edge of the arm 32 that can come into contact with the fixed base 35 separates.

The arm 32, which has been released from the pressure of the moving table, is rotated by the biasing spring 40 of the arm 38 as its pin 43 comes into contact with the edge of the arm 38.

The pin 43 is installed on the lower side of the arm 32 concentrically with the post 33.

The pin 43 of the arm 32 pressed as described above by the arm 38 moves from the edge of the arm on the stop piece 41 side through the protruding edge where the distance from the fulcrum 39 is maximum. It reaches the edge on the opposite side from the stop piece 41.

This opposite edge is constituted by an oblique edge that is inclined with respect to the direction toward the fulcrum 39, and when the pin 43 reaches the oblique edge, the pin 43 comes into contact with the spring 42 via the arm 32. The arm 38 that has been rotated receives a force in a direction in which it is pressed by the stop piece 41.

Further, due to the tension force of the tape guided by the post 33, the arm 32 receives a force in the same direction as the biasing force of the spring 42.

When the movable table is in the second position, the arms 12, 32, 38 are in the positions shown by the chain lines in FIG. 3, and the posts 33 and poles 10, 14 are in the positions shown in FIG. inside the notch 15 of the cassette 1.

In the process of the moving table moving to the first position, the arm 38 follows the pin 37 as described above and is rotated by the spring 40 to a position where it hits the stop piece 41 (the position shown by the solid line in FIG. 3). reach.

On the other hand, the arm 32 is pressed against the spring 42 by the fixed base 35 as described above, and is rotated by this pressing.

When the arm 32 comes off from the fixed base 35 during this rotation, the pin 43 of the arm comes into contact with the edge of the arm 38 on the stop piece 41 side, which is in the middle of the rotation.

In this state, the arm 38 is further rotated by the spring 40 and comes into contact with the stop piece 41 as described above, but during the period until this contact occurs, the pin 43 contacts the beveled edge of the arm 38 as described above. reach.

In FIG. 3, the pin 43 reaches the beveled edge of the arm 38;
The state in which the arm 38 is in contact with the stopper piece 41 and the movable table has reached the first position, that is, the state when the tape is being drawn out, is shown by solid lines.

In the state shown by the solid line in FIG. 3, even if tape tension is applied to the post, there is no risk of the arm 32 rotating, and the tape can be guided in a stable state.

When the movable table is returned from the first position to the second position, the edge of the arm 38 is pressed by the pin 37 during the return process, and the arm 38 rotates to the chain line position.

At the beginning of the rotation of the arm 38, the pin 43 of the arm 32 passes from the above-mentioned oblique edge of the arm 38, passes through the projecting edge, and reaches the edge on the stop piece 41 side, and at this time, the pin 43 of the arm 32 is fixed during rotation. The edge of the arm 32 is brought into contact with the stand 35 .

As the carriage returns to the second position shown in phantom as described above, the arm 32 is also returned to the position shown in phantom by the spring 42.

In FIG. 3 above, a stop piece 41 is provided to restrict the rotation of the arm 38 at a predetermined position, but instead of this stop piece 41, a hook-shaped portion 44 is formed on the edge of the arm 38, as shown in FIG. Intimidate,
The hook-shaped portion can also come into contact with the pin 43 of the arm 32 to restrict the rotational position of the arm 38.

In FIG. 4, the same reference numerals as in FIG. 3 indicate the same elements, and the movable table (arm 12) in the second position, the arm 38 in contact with the pin 37 in this position, and the fixed table 35 The arm 32 abutted is shown in solid lines.

When the carriage is moved from the second position to the first position, the arms 32,38 reach the position shown in dashed lines, as explained in FIG.

At the position indicated by the chain line, the hook-shaped portion 44 of the arm 3B hits the pin 43 of the arm 32 to restrict rotation of the arm 38, and at the same time, the pin 43 hits the above-mentioned beveled edge of the arm 38, causing the arm 32 and the arm to The position of the planted post 33 is regulated to a predetermined position.

In the embodiments shown in FIGS. 3 and 4, the arm 32 is released from the pressure of the fixed base 35 in the process of moving the movable base from the second position to the first position, and then the arm 32 moves to the arm 38.
There is a period in which the spring 40 rotates through the spring 40.

Therefore, spring 40 must be sufficiently strong compared to spring 42.

When the movable table returns from the first position to the second position, it resists the spring 40 via the arm 38, so a large force is required for the return.

FIG. 5 shows the spring 40 that can be made smaller.

In FIG. 5, the same reference numerals as in FIG. 3 indicate the same elements.

The arm 12 in FIG. 5 has a protruding edge 45 in the direction of extension from the fulcrum 11. The arm 12 shown in FIG.

The moving table moves from the second position indicated by the chain line to the first position indicated by the solid line.
When the arm 32, which is pressed by the fixed base 35, comes off the fixed base 35 in the process of moving to the position shown in FIG. The arm 32 is further rotated by being pressed against the edge 45.

On the other hand, the arm 38 is rotated by the spring 40 following the pin 37, and this rotation causes the arm 38 to move towards the stop piece 41.
and reaches the position shown by the solid line.

The arm 12 further rotates to release the pin 43 from the protruding edge 45.
When the pin 43 is removed, the pin 43 comes into contact with the diagonal line of the arm 38 located at the solid line position, and the arm 3 is removed as described above.
2 and the post 33 are regulated to predetermined positions.

Further, the arm 12 rotates further and the pole 10 hits the stopper 1.
3.

When the movable table returns from the first position to the second position, the arm 38 is pressed by the pin 37 and returns to the chain line position, and the pin 43 of the arm 32 is guided by the protrusion 45, and then the arm The edge of 32 comes into contact with the fixing base 35 and returns to the chain line position.

[Brief explanation of drawings]

Figures 1 and 2 are constituent countries explaining a conventional example, Figure 3 is a plan view of a main part showing an embodiment of the present invention, and Figures 4 and 5 are main parts showing other embodiments, respectively. FIG. 1...Cassette, 3...Tape, 5.
...Cylinder, 12...Arm, 32.
-----Second arm, 33...post, 3
8...First arm, 40...First spring, 42...Second spring, 43...
pin

Claims (1)

[Scope of utility model registration request] In a cassette VTR in which a magnetic tape stored in a cassette is pulled out from the cassette and comes into contact with the circumferential surface of a cylindrical head cylinder having a rotating head, a first position close to the rotating head cylinder and a position where the cassette is installed are provided. a movable table movably provided between the device and a second position; a first arm that is rotated by a spring; a second arm that is rotated against a second spring by the movement of the moving base during the movement process; means for stopping the rotation at a predetermined position, and the second arm is implanted on a beveled edge inclined with respect to the direction toward the fulcrum of the rotation of the first arm stopped by the means. The beveled edge is shaped so that the pressed pin is pressed by the force of the second spring, and the pressing force is in a direction in which the first arm is biased by the first spring. A tape guide post is installed in the second arm so that the force due to the tension of the tape guided by the post is in the direction in which the second arm is biased by the second spring. A tape guide position regulating device in a cassette VTR.