JPH0447783Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a magnetic recording and reproducing device such as a video tape recorder.

(Prior Art) In a magnetic recording/reproducing device such as a video tape recorder, when a tape cassette is loaded into the device, a tape loading process is performed to pull out the magnetic tape from the cassette and wrap it around the tape guiding surface of a cylinder assembly. A drive mechanism is provided. As shown in FIG. 6, this tape loading drive mechanism includes a pair of tape transport guide mechanisms 2, which are provided with a vertical roller post 2a and an inclined post 2b, and are moved approximately parallel to each other so as to sandwich the cylinder assembly 1. There is one in which the tape B is wound around the tape guide circumferential surface of the cylinder assembly 1 in a shape of Ω. In other words, the tape transfer guide mechanism 2 moves the magnetic tape B in the loaded cassette A to the unloading position when it is pulled into the cassette A, and to the tape guide circumference of the cylinder assembly 1 when it is pulled out from the cassette A. The tape is configured to be reciprocated by a tape loading drive mechanism to a loading position where it is attached to a surface. The state shown by the solid line in FIG. 6 is the state in which the tape transport guide mechanism 2 is placed in the loading state, and the state shown by the two-dot chain line shows the state in which it is placed in the unloading position.

In the loading position, a tension regulator 4, a full-width erasing magnetic head 5, an impedance roller 3, etc. are arranged in the running path of the magnetic tape B, and the magnetic tape B is In the process of reaching the cylinder assembly 1 guided by the transfer guide mechanism 2, it is attached to these members. After being guided through the cylinder assembly 1 to the tape transport guide mechanism 2 on the exit side, the tape is attached to an audio erasing magnetic head 6 and an audio control signal magnetic head 7, respectively, and is further connected between a pinch roller 8 and a capstan 9. The film is wound through the reel in the cassette A.

When the tape transport guide mechanism 2 moves from the unloading position to the loading position and vice versa, the impedance roller 3, full-width erasing magnetic head 5, etc. that extend into this movement path come into contact with the tape transport guide mechanism 2. A structure is adopted in which the movement of the tape transfer guide mechanism 2 is not hindered by being temporarily pushed out of the movement path due to contact. This conventional structure is shown in FIG. To explain the structure of FIG. 5, the impedance roller 3 and the full-width erasing magnetic head 5 are arranged on the same rotating member 11 whose one end is rotatably supported by a pivot 10 installed upright in the main body of the device. The full-width erasing magnetic head 5 is completely fixed to the rotating member 11.
The impedance roller 3 is rotatable about a pivot shaft 12 erected on a rotating member 11 . Further, the rotating member 11 is wound around the pivot shaft 10, and one end is connected to the fixed member of the main body of the device, and the other end is connected to the rotating member 11.
A torsion spring 15 whose member is locked to a boss 14 formed on the back surface of the tape transfer guide mechanism 2 is always biased to rotate inward in the moving path R, but the amount of rotational displacement is It is restricted by a stopper pin 26 provided on the main body of the device.

The impedance roller 3 and the full-width erasing magnetic head 5 configured in this way are used when the tape transport guide mechanism 2 moves from the position depicted by the solid line in FIG. 5 to the position depicted by the dashed line. 2, the rotating member 11 and the rotating member 11 resist the biasing force of the torsion spring 15 and move away from the movement guide path R around the pivot 10, that is, from the position drawn by the solid line in the figure to the dashed-dotted line. It is designed to rotate and displace to the state depicted in . or,
The same applies to the collision with the impedance roller 3.

(Problems to be Solved by the Invention) However, in the conventional structure as described above, the tape transfer guide mechanism 2 collides with the rotating member 11 and removes the full-width erasing magnetic head 5 from the movement guide path. When the rotating member 11 rotates around the center, the impedance roller 3 also moves significantly outward. This hinders the overall compactness of the device and at the same time gives a shock to the tape when the collision is released. Further, since the torsion spring 15 also becomes more torsion, the load on the tape transport guide mechanism 2 also becomes greater.

This idea was developed in consideration of the above points, and it minimizes the amount of movement of the impedance roller and full-width erasing magnetic head, and also minimizes the load of the torsion spring on the tape transport guide mechanism. The purpose is to create a structure that has less impact on the body.

(Means for Solving the Problems) In order to achieve the above object, this invention makes it possible to move an impedance roller and a magnetic head within a moving path between a loading position and an unloading position taken by a tape transport guide mechanism. A magnetic recording and reproducing device is provided with a magnetic recording and reproducing device, in which one end is rotatably pivoted to the main body of the device, a pivot is provided upright at the free end, and the impedance roller is rotatably pivoted to the pivot. a second arm member having a portion fixed to the magnetic head and having one end rotatably supported on the pivot of the first arm member; 1. The second arm member is provided between the second arm members and is independent of the first arm member when the second arm member moves the magnetic head in a direction away from the movement path. a connection control means that allows the displacement of the second arm member and rotates integrally with the second arm member when the first arm member rotates; The structure includes a spring member that constantly biases the second arm member in the direction of displacing the magnetic head.

(Function) According to the magnetic recording and reproducing apparatus of the present invention having the above configuration, the arm member, which is a rotating member for moving the impedance roller and the magnetic head, is constructed separately, and furthermore, the tape transport guide mechanism is When colliding with the second arm and removing the magnetic head from the movement path, the first arm member holding the impedance roller is not rotated.
By rotating only the second arm member that holds the magnetic head, the amount of displacement of the impedance roller can be minimized, and the distance between the rotation fulcrum of the second arm member and the point of action of the spring member can be reduced. By increasing the size, the load of the spring member on the tape transport guide mechanism is reduced.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 are plan views showing the main parts of the magnetic recording/reproducing apparatus according to the present invention in each operating state, and FIG. 4 is a side view taken along the line A--A in FIG. 1.

In the drawings, members designated by the same reference numerals as in FIGS. 5 and 6 are the same members that perform the same functions.

In FIGS. 1 to 4, an impedance roller 3 is attached to the other free end of a first arm member 16, one end of which is rotatably supported on a pivot shaft 10 erected on an apparatus main body 17. A pivot shaft 22 is rotatably supported, and one end of a second arm member 18 is rotatably supported on the pivot shaft 22 in an overlapping relationship with the first arm member 16. has been done.
A full-width erasing magnetic head 5 is fixed on the second arm member 18, and a stepped portion 18A is provided at the other free end thereof, and a step portion 18A is provided on the side opposite to the moving path R side of the tape transport guide mechanism 2. is an abbreviation for the downwardly protruding cross section L
A letter-shaped locking leg portion 18B is formed respectively. The arrangement relationship between the second arm member 18 and the impedance roller 3 is such that the shaft 22 is inserted into each through hole.
The arm member 18 is placed thereon, and then the impedance roller 3 is placed thereon, and then the fixing ring member 19 is press-fitted onto the pivot shaft 22 on the upper side thereof.
It is prevented from coming off. Also, the first arm member 16 and the second arm member 1 are in an overlapping relationship with each other.
8, the step portion 1 of the second arm member 18 is attached to the first arm member 16 on the side where the first arm member 16 is supported by the pivot shaft 10.
A protruding tongue piece 16A that protrudes within the region 8A is provided, and this protruding tongue piece 16A restricts the upward displacement of the second arm member 18, and is further press-fitted into the pivot shaft 10 above the first arm member 16. The fitted fixing ring member 20 prevents it from coming off. The torsion spring 1 is attached to the first arm member 16 and the second arm member 18 configured in this way.
5 is provided. This torsion spring 15 has one end locked to the stopper 13 on the device main body 17 side, and the other end locked to the locking leg 18B of the second arm member 18, so that the axis of the central winding portion thereof is pivoted. 1
It is concentric with 0. The biasing force of the torsion spring 15 constantly applies a force to the second arm member 18 to return to rotation in the direction of the movement path R, and
It is configured to be applied to the first arm member 16 through contact with the back surface of a locking leg portion 18B that constitutes a connection control means with the second arm member 18. . Also, the biasing force of this torsion spring 15 causes the first and second arm members 16,1 to
8 is regulated by contact between a stopper 21 provided on the device body 17 and the lower end of a pivot 22 provided upright on the first arm member 16.

In this configuration, when the tape transfer guide mechanism 2 is placed at the unloading position as shown in FIG. , the impedance roller 3 and the full-width erasing magnetic head 5 are in a state in which they have advanced into the moving path R.

Then, when the tape transfer guide mechanism 2 starts the loading operation and collides with the arcuate portion of the second member 18 on which the full-width erasing magnetic head 5 is placed as shown in the second figure, the second arm member Only the full-width erasing magnetic head 5 rotates clockwise about the pivot 22 against the biasing force of the torsion spring 15 and retreats from the movement path R. When the tape transport guide mechanism 2 further advances the loading and the vertical roller post 2a collides with the impedance roller 3 as shown in FIG. Since the power is received, the first and second arm members 16 and 18 are integrally rotated counterclockwise against the biasing force of the torsion spring 15, and as a result, the impedance roller 3 and the full-width erasing magnet The head 5 retreats from the moving route R to a certain point. Then, when the loading progresses further and the collision between the tape transfer guide mechanism 2 and the impedance roller 3 is released, it is pushed by the locking leg 18B by the biasing force of the torsion spring 15 and integrated with the second arm member 18. Finally, the first arm member 16 returns to its initial state where it is regulated by the stopper 21 again. That is, the impedance roller 3 and the full-width erasing magnetic head 5 are brought into contact with the stretched tape B after the loading has been completed.

Note that the above operation is performed when the tape transfer guide mechanism 2 moves from the unloading position to the loading position, but conversely, when returning from the loading position to the unloading position, the tape transfer guide mechanism 2 moves from the third position to the unloading position.
Since the state returns to the first state after passing through the states shown in FIGS.

Further, in the above embodiment, the impedance roller 3 and the full-width erasing magnetic head 5 are shown, but
The present invention is not limited to this, but can also be applied to other combination structures of impedance rollers and magnetic heads and similar devices.

(Effects of the invention) As explained above, the magnetic recording and reproducing apparatus according to the invention has the following effects.

(1) The load that the tape transfer guide mechanism receives when it collides with and passes the impedance roller is the same as the conventional structure, but the load that it receives when it collides with and passes the second arm member is Since the distance between the acting points of the torsion spring and the pivot axis serving as the center of rotation can be increased, the distance between the points of action of the pivot and the torsion spring can be made smaller, and the negative influence on the tape transport guide mechanism can be reduced.

(2) Since the impedance roller does not move when the magnetic head moves, the amount of displacement of the impedance roller can be minimized.
The compactness of the device is further improved.

(3) Since the amount of displacement of the impedance roller is small, the impact on the tape that occurs when the impedance roller collides with the stopper during return is reduced.

[Brief explanation of drawings]

1 to 3 are diagrams showing the main parts of the magnetic recording and reproducing apparatus according to the present invention in each operating state, and FIG. 1 shows the state when the tape transport guide mechanism is placed at the unloading position. FIG. 2 is a plan view showing the state when the tape transport guide mechanism is loaded to the position where it collides with the second arm member, and FIG. 3 is a plan view showing the state where the tape transport guide mechanism is loaded to the impedance roller FIG. 4 is a side view taken along line A-A in FIG. 1;
FIG. 5 is a plan view showing the main parts of a conventional device, and FIG. 6 is a plan view showing the arrangement of main parts in a video tape recorder to which the present invention is applicable. 2...Tape transfer guide mechanism, 3...Impedance roller, 5...Magnetic head (full width erasing magnetic head), 10...Pivot serving as a rotational fulcrum of the first arm member, 15...Spring member (torsion spring) ,
16...First arm member, 17...Device main body,
18... Second arm member, 18B... Locking leg portion constituting the connection control means, R... Movement path.

Claims (1)

[Scope of utility model registration request] A magnetic recording/reproducing device comprising an impedance roller and a magnetic head movably disposed within a moving path between a loading position and an unloading position taken by a tape transport guide mechanism, one end of which is rotatably attached to the main body of the device. a first arm member which is pivotally supported and has a pivot shaft erected at its free end, and the impedance roller is rotatably supported on the pivot shaft; a second arm member rotatably supported on the pivot of the first arm member;
The second arm member is provided between the second arm members and is independent of the first arm member when the second arm member moves the magnetic head in a direction away from the movement path. connection control means that allows the displacement of the arm member and rotates integrally with the second arm member when the first arm member rotates; A magnetic recording/reproducing device comprising a spring member that constantly biases the second arm member in a direction to displace the head.