JPH0526247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and an object of the present invention is to reduce the size and weight of the device, and to easily position a magnetic head in contact with a magnetic tape in a reliable and stable manner. With the goal.

A conventional rotating head type magnetic recording/reproducing device will be explained with reference to FIG.

FIG. 1 is a schematic diagram showing the tape running system of a conventional rotary head type magnetic recording/reproducing apparatus.

As shown in FIG.
2 is wound around the rotating head drum 120 via guide posts 103 and 104 installed inside the cassette 119, a tension post 105 fixed to the chassis, an erasing head 106, a guide roller 107, and guide posts 108 and 109. Furthermore, the guide post 110,1 fixed to the chassis
11, guide roller 112, audio head 11
3, guide post 114, pinch roller 115,
The material passes through the capstan 116, enters the cassette 119, passes through the guide post 117 installed in the cassette 119, and is taken up on the take-up reel 118.

Note that the dashed-dotted lines 120 and 121 indicate guide posts 108 and 109, guide post 110, and
111 when the tape is drawn out, and the guide post 10 is shown before the tape is drawn out.
8, 109 and guide posts 110, 111 are respectively 108a, 109a, 110a, 11 in the figure.
It is located at the position indicated by 1a.

Therefore, since the guide posts 108, 100, 110, 111 move during tape loading, the audio head 11 fixed to the chassis
3 and the erase head 106 to the guide post 100,
Movement trajectory 120, 12 of 108, 110, 111
It had to be arranged so that it would not be located above 1. Therefore, there was a problem in that it was difficult to miniaturize the conventional device.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 48-77815, there is also a device in which the audio head and the erasing head are made movable and positioned on the movement trajectory of the guide post only when tape loading is completed. However, the reliability and stability of the positioning remained extremely unsatisfactory.

The present invention solves these problems and provides a magnetic recording and reproducing device that is significantly smaller and lighter in weight, and that also enables reliable and stable positioning of the audio head, erasing head, etc. be.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 7.

FIG. 2 is a schematic configuration diagram showing a tape running system of a rotating head type magnetic recording/reproducing device which is an embodiment of the present invention, FIG. 3 is a partial perspective view of the audio head section of the same device, and FIGS. Figure 5 is an explanatory diagram of the operation of the same section, and Figure 6
7 are perspective views of the same essential parts.

In the figure, 1 is a cassette, and inside the cassette 1, a supply reel 2, a magnetic tape 3, a guide roller 4, guide rollers 21, 22, and a take-up reel 23 are arranged. The tape 3 is pulled out from the supply reel 2, passed through a guide roller 4, a tension post 5, a guide roller 6, an erasing head 7 fixed to the chassis, a guide post 8, and a guide post 9, and then wound around a rotating head drum 10. Furthermore, guide posts 11 and 12, a guide roller 13, a control head 17 fixedly supported by an arm 14 rotatably supported by the chassis, an audio head 16, a guide post 18, and a pinch roller 1.
9. It passes through the capstan 20, enters the cassette 1 again, passes through the guide posts 21 and 22, and is taken up on the take-up reel 23.

24 and 25 are guide posts 8 and 9, respectively.
8 in FIG.
It is held at the positions shown in c, 9c, 11c, and 12c.

In FIG. 3, an audio head 16 and a control head 17 are installed on a head base 15,
The head base 15 is attached to the arm 14 with three screws. The arm 14 having a boss portion is supported by the chassis so as to be rotatable about a rotation fulcrum 14a. The boss part of the arm 14 has a spring hook part 14b, and the arm 14 is held at the pivot point 1 by a tension spring 26 to which one end is fixed.
4a in the direction of arrow 30, and is locked in a predetermined position (first position) by a fixing pin 27.

Reference numeral 31 denotes a loading base, which has a groove 32 for realizing the loading locus 25 shown in FIG. 2, and the guide posts 11 and 12 perform a tape loading operation using this groove 32 as a guide.

In FIGS. 4 and 7, 36 is a drive gear that meshes with the plate-shaped loading ring 35;
Cam groove 3 shown in FIG. 7 provided in drive gear 36
A pin 37b of a drive lever 37 is engaged with the pin 6a. A pin 37a is implanted at the tip of the drive lever 37, and the drive gear 36 and the lever 37 constitute a drive member. And this pin 37a
engages lever (A) 38. Lever (A) 3
8 is rotatably supported by a pin 37a, and lever (C) 39 and lever (B) 4 are supported by a pin 38a.
0 and is rotatably connected. Lever (C) 3
One end 39a of 9 is rotatably connected to a lever (D) 41, and the lever (D) 41 is connected to one end 41a.
is rotatably supported by a pin fixed to the loading base 31. The other end is pulled by a tension spring 45 whose one end is fixed to a pin 46 on the loading base 31, and the bent portion 4
1b and the loading base 31 are in contact with each other.

The lever (B) 40 is rotatably connected to a lever (E) 42, and one end of the lever (E) 42 is in contact with a downward protrusion 43 of the arm 14. The hole 44 serves both as an escape hole for the convex portion 43 and a hole for determining the fixing position.

The magnetic head moving means includes the arm 14, lever (A) 38, lever (C) 39, lever (B) 40, lever (D) 41, and lever (E) 4.
2, a tension spring 45, and a transmission means included in the magnetic head moving means:
Lever (A) 38, lever (C) 39, lever (B) 40, lever (D) 41, lever (E) 4
2. It is composed of a tension spring 45.

Next, the operation of this device will be explained.

First, in order to load the tape 3, as the loading ring 35 rotates clockwise as shown in FIG.
6 rotates counterclockwise. Drive gear 3 in Fig. 7
As the cam groove 36a of No. 6 moves, the drive lever 37 rotates counterclockwise. As a result, lever (A) 38, lever (B) 40, and lever (C) 39 begin to move, but since lever (D) 41 is pulled by a strong tension spring 45, lever (C) 39 initially moves from fulcrum 39a. Rotates around.
Then, the lever (B) 40 rotates the lever (E) 42 counterclockwise, and the arm 14 integrated with the convex portion 43
starts rotating clockwise.

Then, the arm 14 is moved to a position where the protrusion 43 and the relief hole 44 come into contact, and the drive lever 3
When the rotation of 7 continues, the lever (C) 39 moves the lever (D) 41. This causes the tension spring 4
5 acts to further rotate the arm 14 in the clockwise direction, and the arm 14 is locked by the stopper portion at one end of the hole 44, resulting in the state shown in FIG. 5, that is, the second state as defined in the claims. It is fixed in position. Next, when external vibrations or an unexpected external force act on the arm 14, the audio head 16, etc., to push them back toward the first position shown in FIG. In FIG. 5, the arm 14 rotates counterclockwise around the end 14a, but this movement is transmitted to the lever (E) 42 that is in contact with the downward convex portion 43 of the arm 14. , this lever (E) 42 is rotated clockwise around one end 42a.

This operation causes the lever (E) 42 to have one end 4
Lever (B) 40 rotatably connected at 0a
is moved downward in FIG.

This movement passes through the lever (C) 39 and rotates the lever (D) 41 clockwise around one end 41a, causing the tension spring 45 applied to one end of the lever (D) 41 to be extended. By doing so, external forces from the outside are dispersed and suppressed.

At this time, a force is also applied to the lever (A) 38 to move it to the left, and the drive lever 37 is attempted to be moved clockwise via the one end 37a, but the lever (A) 38 and the lever (B) 40 , the lever (C) 39 constitutes a toggle mechanism, and since the lever (B) 40 and the lever (C) 39 are set in a substantially straight line, the lever (A) 3
The force applied to 8 is extremely reduced and suppressed, and constitutes the dispersion and suppression mechanism referred to in the claims.

Furthermore, the leftward force applied to the lever (A) 38 is received by the one end 37a and attempts to move the drive lever 37 clockwise, but the drive lever (A)
One end 37b of the 37 engages with a cam groove 36a of the drive gear 36, as shown in FIG. As a result, the leftward force of the lever (A) 38 is almost prevented from being transmitted as a rotational force to the drive gear 36, which is considered irreversible in the claims. This constitutes the transmission mechanism.

In this way, since the driving force acting on the loading mechanism is also used to move the audio head arm, the movement and positioning of the audio head arm can be easily and reliably performed.

Although this embodiment shows an example in which the audio head is moved, further miniaturization is possible if the erasing head is also moved. Furthermore, although the drive member is composed of a drive gear 36, a drive lever 37, etc., it is not limited to this, and it goes without saying that other configurations can be realized.

As described above, according to the present invention, significant miniaturization,
In addition to reducing weight, when a force is applied to move the entire device from the outside, the force applied to the magnetic head is reduced, especially when the magnetic tape is in contact with the magnetic head during recording or playback. However, by providing a transmission means for dispersing and suppressing external force in the magnetic head moving means and using an irreversible transmission mechanism in the drive member, the displacement of the magnetic head due to the external force becomes extremely small, and the magnetic tape and magnetic head are The relative relationship between the two is stable, and recording and reproducing operations can be performed stably.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional magnetic recording and reproducing device, FIG. 2 is a schematic configuration diagram of a magnetic recording and reproducing device that is an embodiment of the present invention, FIG. 3 is a perspective view of the main parts of the device, and FIG. Figure 5 is an explanatory diagram of the operation of the same section, Figure 6
7 are partial perspective views of the same part. 16...Audio head, 14...Arm, 36
... Drive gear, 37 ... Drive lever (A), 40
...Lever (B), 39...Lever (C), 41...
...Lever (D), 42...Lever (E).

Claims (1)

[Scope of Claims] 1. A rotating head drum, a tape loading mechanism for winding a magnetic tape around the rotating head drum, a guide post that is moved by the tape loading mechanism, and a magnetic head that comes into contact with the magnetic tape. , before tape loading, the magnetic head is held at a first position that is not located on the movement locus of the guide post, and at or just before the end of tape loading, the magnetic head is brought into contact with the magnetic tape; a magnetic head moving means for moving the magnetic head to the second position; and a driving member for extracting power from the tape loading mechanism and interlocking the magnetic head moving means with the tape loading mechanism, the magnetic head moving means for moving the magnetic head to the tape loading mechanism; It has a transmission means for transmitting the power from the member to the magnetic head, and the transmission means is configured to transmit power from the member to the magnetic head when a force is applied to return the magnetic head to the first position when the magnetic head is in the second position. , a mechanism for dispersing and suppressing transmission of the returning force to the drive member; and the driving member prevents the returning force from being transmitted to the tape loading mechanism. A magnetic recording/reproducing device characterized by having an irreversible transmission mechanism.