JPH10106077A - Magnetic recording / reproducing device - Google Patents

Abstract

(57) [Problem] To provide a magnetic recording / reproducing apparatus that selectively drives a magnetic tape in both forward and reverse directions and reproduces the magnetic tape at a predetermined height position in a capstan even during reverse direction reproduction. Provide the configuration that is done. SOLUTION: Between a capstan 8 and a take-up reel 34,
A moving guide post 1 that comes into contact with the magnetic tape 11 and regulates the height position of the magnetic tape 11 is disposed so as to be movable in a predetermined range in a direction in which the moving guide post 1 comes into contact with the magnetic tape 11. At the time of forward drive, an elastic biasing force smaller than the tape tension at the time of normal recording and reproduction is applied by a spring 7 to the direction in which the moving guide post 1 comes into contact with the magnetic tape. A large elastic urging force is applied by a spring 5 in a direction in which the moving guide post 1 comes into contact with the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (VTR) and a tape recorder, wherein a magnetic tape is brought into contact with a magnetic tape between a magnetic tape driving means and a take-up reel.
The present invention relates to a magnetic recording / reproducing apparatus having a movable post for regulating a height position of the magnetic tape.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing a tape running path of a conventional VTR.
The first fixed post 22, the tape tension control post 23, the erasing head 2
4. First rotating post 25, inclined post 26, rotating head cylinder 27, inclined post 28, second rotating post 2
9, magnetic head 30 for voice / control signal, second fixed post 31, capstan 8, moving guide post 1
Through the take-up reel 34. The capstan 8 is located in a notch 10a formed on the front surface of the tape cassette 10, and 9 is a pinch roller that can be brought into contact with and separated from the capstan 8.

The erasing head 24, the rotary head cylinder 27, the audio / control magnetic head 30 and the capstan 8 are so arranged that the magnetic tape 11 always comes into contact with a predetermined tape running height position during recording and reproduction.
In order to regulate the height position of the running tape, a flanged post that regulates the height position of the tape is used for the first rotation post 25, the second rotation post 29, and the second fixed post 31. Have been.

[0004] In addition, at the time of REV in which the tape is driven in the reverse direction by the capstan 8 to reproduce, the magnetic guide 11 is introduced into the capstan 8 so that the magnetic tape 11 is always introduced into the capstan 8 at a predetermined tape running height position. Also, a flanged post that regulates the height position is used. FIG. 6 is a plan view of the drive mechanism of the moving guide post 1 when the tape is stopped, FIG. 7 is a plan view showing the reverse reproduction state, and FIG. 8 is a plan view showing the normal recording / reproduction state. The moving guide post 1 rotates in the directions of arrows A and B around a pin 3 provided on a substrate (not shown) as a rotation center, and has one end of a spring 1.
2 is implanted at the tip of the arm 2 urged in the direction of the arrow A by the arrow. The other end of the spring 12 is engaged with the engaging portion 14 of the substrate.

The reference numeral 6 has a guide groove 6a for engaging with the pin 3, and is provided with arrows C and C by another driving source (not shown).
A sliding lever which is reversibly slid in the direction D, engages with a pin 4 implanted at the other end of the arm 2, and moves the arm 2 in accordance with sliding of the sliding lever 6. It has a cam groove 6b for rotating.

The operation of shifting from the tape stop state in FIG. 6 to the reverse reproduction state in FIG. 7 will be described. In FIG. 6, the sliding lever 6 is moved in the direction C, and the pinch roller 9 is rotated in the direction of the arrow by another driving mechanism in conjunction with the operation of rotating the arm 2 in the direction A to move the capstan 8 to the capstan 8. By pressure bonding, first, a forward reproduction state shown in FIG. 8 is obtained. Thereafter, the magnetic recording tape 11 slightly moves in the F direction while maintaining a predetermined tension, and stops. In this state, the moving guide post 1 stops at a first position slightly protruding in the direction A from the position where the tape is stopped.
Since the angle of wrap around the moving guide post 1 is small, the regulating force on the tape is small.

Next, from this state, the sliding lever 6 further moves in the direction C, and the arm 2 is moved by the cam groove 6b.
Is further rotated in the direction A, and the moving guide post 1 stops at the second position most protruding in the direction A. Accordingly, the angle at which the magnetic tape 11 winds around the moving guide post 1 increases, so that the restricting force on the magnetic tape 11 increases, and when the magnetic tape 11 runs in the opposite direction, the capstan 8 Stabilize the tape position. Then, when the capstan 8 starts rotating in the counterclockwise direction, the magnetic tape 11 runs in the E direction, and the reverse reproduction starts.

In the transition from the reverse reproduction to the forward reproduction, the sliding lever 6 moves in the direction D and the arm 2 rotates in the direction B from the state shown in FIG. Move to the first position, stop and complete the transition.

[0009]

In the magnetic recording / reproducing apparatus having the moving guide post capable of moving the position between the capstan and the take-up reel in the running direction of the tape as described above, the magnetic recording / reproducing apparatus reverses the reproduction from the normal direction. When the moving guide post moves in the direction reproduction, the moving guide post pulls out the tape in the direction of arrow A against the tension of the magnetic tape, so that the tape tension becomes excessively large due to a large rotational resistance of the take-up reel. In such a case, there have been problems such as damage to the magnetic tape and deformation of the engaging portions of the arm and the sliding lever.

Further, when moving from the reverse reproduction state to the normal reproduction state, the moving guide post moves from the second position to the first position, and the length of the tape path system of the magnetic tape is shortened. As a result, the magnetic tape sags. Therefore, when the take-up reel starts winding, there is a problem that the tension of the magnetic tape is increased by impact and the tape is damaged.

[0011]

In order to solve the above-mentioned problems, a magnetic recording / reproducing apparatus according to the present invention comprises a recording / reproducing magnetic head and a guide post for regulating a height position of a magnetic tape running in front of the magnetic head. A tape drive means comprising a capstan and a pinch roller capable of selectively driving the magnetic tape in both forward and reverse directions, and a take-up reel for sequentially winding the magnetic tape driven in the forward direction by the tape drive means. In the magnetic recording / reproducing apparatus having the tape running direction in this order, a moving guide post, which is in contact with the magnetic tape and regulates its height position, is provided between the tape driving means and the take-up reel. It is disposed so as to be movable within a predetermined range in a direction crossing the path, and its moving guide post is provided with a normal driving in the forward direction by the tape driving means. At the time of recording / reproduction, an elastic biasing force smaller than a predetermined tape tension at the time of normal recording / reproduction is applied in a direction in which the moving guide post comes into contact with the magnetic tape, and at the time of reverse reproduction of reverse driving by the tape driving means. The present invention is characterized in that an elastic biasing force larger than a predetermined tape tension at the time of reverse reproduction is applied in a direction in which the moving guide post comes into contact with the magnetic tape.

According to the present invention, the magnetic tape is always pulled out with a force higher than the strength of the magnetic tape at the time of mode transition, or only the moving guide post moves away from the magnetic tape. Because the moving post can contact the magnetic tape with the force before and after the tension,
It is possible to prevent tape damage at the contact portion between the moving post and the magnetic tape, which occurs at the time of mode transition.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment) An embodiment of the invention described in claim 1 of the present invention will be described below with reference to FIGS. Components having the same functions as those of the above-described conventional example are denoted by the same reference numerals.

FIG. 1 shows a state in which the magnetic tape 11 is stopped. Reference numeral 1 denotes a moving guide post implanted in an arm 2, and the arm 2 is a pin implanted in a substrate (not shown). The pin 3 is supported so as to be rotatable in the directions of arrows A and B, and one end of the helical spring 5 positioned by the pin 3 is engaged and fixed to the engaging portion 2a. The other end of the spring 5 is engaged with a spring hook 6c of a sliding lever 6 which slides reversibly by a driving source (not shown).

As shown most clearly in FIG. 2, the spring hook 6c has an opening extending in the sliding direction of the sliding lever 6, into which the tip of the spring 5 is inserted. Therefore, the spring 5 is configured to apply an elastic biasing force in the direction of arrow A to the arm 2 only when the sliding lever 6 is moved to a position in the direction of arrow C. The urging force of the spring 5 at this time is set so as to generate a force slightly larger than the force received by the moving guide post 1 due to the tension during the reverse reproduction of the magnetic tape 11.

Reference numeral 7 denotes a spring having one end engaged with the hole 2b of the arm 2 and the other end engaged with an engaging portion 13 provided on the substrate, and constantly biases the arm 2 in the direction of arrow A. I do.
The biasing force of the spring 7 is set so as to generate a slightly smaller pressing force than the force for pushing back the moving guide post 1 by the tension of the magnetic tape 11 during the forward reproduction.

In the above configuration, when the magnetic tape shown in FIG. 1 is stopped, the position of the arm 2 is forcibly determined at the left end of the cam portion 6b of the sliding lever 6, and the arm 5 is driven by the springs 5 and 7. The activation has no effect.

FIG. 2 is an enlarged view of a main part of FIG. 2 and a plan view of FIG. 4 when reproducing the magnetic tape in the forward direction. The mode transition from the magnetic tape stopped state to the forward direction reproduction state is such that the sliding lever 6 moves in the C direction by a predetermined amount from the state shown in FIG. 1 and the engagement pin 4 is no longer restricted by the cam portion 6b.
The arm 2 starts rotating in the direction A by the urging force of the spring 7. Thereafter, when the magnetic tape 11 starts traveling in the forward direction by the capstan 8, the pinch roller 9 and the take-up reel (not shown) and has a predetermined tension, the arm 2 is moved by receiving the tension by the moving guide post 1. It is pushed in the direction of arrow B and stops at a position where it is balanced with the urging force of the spring 7.

Next, a description will be given of a mode transition from the forward reproduction to the reverse reproduction of the magnetic tape 11, that is, the case where the state changes from FIG. 4 to FIG. The moving guide post 1 in FIG. 4 is at a first position slightly protruding in the direction A from the tape cassette 10, and in order to reach the second position in the reverse playback mode, the moving guide post 1 is further moved in the direction A. Have to go to. Then, the sliding lever 6 further slides by a predetermined amount in the direction of arrow C, and
Is engaged with one end of the spring 5 to rotate the arm 2 in the direction of arrow A, and the engaging pin 4 contacts the side wall of the cam portion 6b to move the arm 2 and the moving guide post to the second position. To the position. In this state, the urging force of the spring 5 is set to a force slightly larger than the force that pushes the moving guide post 1 due to the tension that the magnetic tape 11 travels in the reverse reproduction direction, that is, the direction of the arrow E, and The force is set to be smaller than the pressing pressure that causes tape damage to the magnetic tape 11. For this reason, even if the magnetic tape 11 cannot be pulled out due to some trouble during the mode transition and the tape 2 is damaged due to the turning force of the arm 2 in the direction A, the spring 5 can be moved by the sliding lever 6. Is absorbed, and no force is applied to the magnetic tape 11 beyond the set force, so that tape damage can be prevented.

A mode transition from reverse reproduction to normal reproduction is performed.
That is, the case where the state changes from FIG. 3 to FIG. 4 will be described. In order for the moving guide post 1 to move from the second position to the first position, the sliding lever 6 moves in the direction of arrow D, the spring 5 substantially disengages from the spring hook 6c, and the arm 2 The state is restricted only by the urging force of the spring 7. Thereafter, when the magnetic recording tape 11 travels in the forward direction indicated by the arrow F, the arm 2 rotates in the direction of the arrow B by being pushed by the tape tension, and stops rotating at a position where the arm 2 is balanced with the tape tension. I do.

With this configuration, the arm 2 always moves the guide post 1 while the magnetic recording tape 11 and the guide post 1 are in contact with each other with a slight pressing force due to the urging force of the spring 7 when the mode is switched. When the guide post 1 separates from the magnetic tape 11 and becomes slack, or when the tension of the tape subsequently increases, tape damage caused by the abutting contact between the guide post 1 and the magnetic recording tape 11 is prevented. can do.

[0022]

As described above, according to the present invention, an arm having a guide post abutting on a magnetic tape is rotated via an elastic body such as a spring to shift the mode of the magnetic tape in the forward / reverse direction. An advantageous effect of preventing tape damage and mechanical deformation which are likely to occur sometimes can be obtained.

[Brief description of the drawings]

FIG. 1 is a main part plan view of a magnetic recording and reproducing apparatus according to an embodiment of the present invention in a tape stopped state.

FIG. 2 is an enlarged perspective view of a main part of the magnetic recording and reproducing apparatus according to the embodiment;

FIG. 3 is an essential part plan view of the magnetic recording and reproducing apparatus according to the embodiment in a reverse reproducing state;

FIG. 4 is an essential part plan view of the magnetic recording / reproducing apparatus according to the embodiment in a forward reproduction state;

FIG. 5 is a plan view showing a tape running path of a conventional VTR.

FIG. 6 is a main part plan view of a conventional magnetic recording / reproducing apparatus in a tape stopped state.

FIG. 7 is a plan view of a main part of a conventional magnetic recording / reproducing apparatus in a reverse reproduction state.

FIG. 8 is a plan view of a main part of a conventional magnetic recording / reproducing apparatus in a forward reproduction state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving guide post 2 Arm 3 Pin 5, 7 Spring 6 Sliding lever 8 Capstan 9 Pinch roller 11 Magnetic tape

Claims (1)

[Claims] 1. A recording / reproducing magnetic head, a guide post for regulating a height position of a magnetic tape running in front of the magnetic head, a capstan and a pinch roller capable of selectively driving the magnetic tape in both forward and reverse directions. A tape drive unit comprising: a tape drive unit; and a take-up reel for sequentially winding a magnetic tape driven in a forward direction by the tape drive unit, in this order with respect to a running direction of the magnetic tape. And a take-up reel, a moving guide post which comes into contact with the magnetic tape and regulates the height position thereof is movably arranged within a predetermined range in a direction crossing the running path of the magnetic tape, and the moving guide post is moved. At the time of normal recording and reproduction in the forward drive by the tape driving means, the guide post has a tape tension smaller than a predetermined tape tension at normal recording and reproduction. A biasing force is applied to the moving guide post in a direction in which the moving guide post comes into contact with the magnetic tape. A magnetic recording / reproducing apparatus, wherein a force is applied in a direction in which the moving guide post comes into contact with the magnetic tape.