JPH0345302Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic recording/reproducing device, and more particularly to a tape tension control mechanism for keeping the tension of a magnetic tape constant during running.

(Prior Art) Conventionally, in general, in magnetic recording and reproducing devices such as video tape recorders, in order to stabilize the contact between the magnetic tape and the magnetic head during recording and reproducing, etc.,
A tape tension control mechanism as shown in FIG. 1 is provided. A brake felt 2 made of friction material is attached to one side of a supply reel stand 1 that sends out a magnetic tape (not shown) stored in a cassette case during recording and playback, etc., and a tensioner bent in a U-shape. A band 3 is provided, and one end of the tension band 3 is fixed to a chassis 6 with a screw 5 via a fixed angle 4. On the other hand, the other end is fixed to a tension arm 7 rotatably attached to the chassis 6. This tension arm 7 is an arm body 7a.
and a relay arm 7b to which the band 3 is fixed, and the relay arm 7b is rotatably attached to the arm body 7a. Further, a spring 8 is attached to this arm body 7a, and urges the tension arm 7 in the direction of arrow C.

During normal recording and playback, the supply reel stand 1
rotates in the direction of arrow A, and the tension arm 7 is urged in the direction of arrow C by the elasticity of the spring. For this reason, the reel stand 1 and the brake felt 2 come into contact and apply an appropriate braking force to the reel stand 1, giving an appropriate tension to the magnetic tape.

(Problems to be Solved by the Invention) However, in the conventional magnetic recording and reproducing device described above, when the reel stand 1 is rotated in the direction of arrow B during special playback, one end of the band 3 is rotated by the angle 4. Since it is fixed to the chassis 6, the brake felt 2 acts to bite into the reel stand 1. Therefore, the braking force becomes excessive, and the reel stand 1 does not rotate or the rotational torque becomes unstable, resulting in a drawback that the tension of the magnetic tape also becomes unstable.

(Means for Solving the Problems) The present invention aims to eliminate the above-mentioned drawbacks of the conventional art, by making one end of the tension band, which was conventionally fixed, slidable within a predetermined range, and by using an elastic material to make it unidirectional. It is used to energize and adjust the braking force.

(Example) The present invention will be explained below according to the example shown in FIGS. 2 and 3. First, around the supply reel stand 9, there is a brake felt 1 made of a friction material.
0 is attached to a tension band 11 bent into a U-shape, and one end of this band 11 is provided with a sliding angle 15 having two elongated holes 12, 12 and a locking piece 14 of a spring 13. Fixed. Furthermore, the sliding angle 15 is screwed with a screw 16.
Fixed angle 1 fixed to chassis 17 by
It is slidably attached to 8. This fixed angle 18 has shafts 19, 19 inserted into the elongated holes 12, 12 and a locking piece 20 of the spring 13. Shaft 19,1
9, the sliding angle 15 is held slidably within the range of the elongated holes 12, 12.
Further, a spring 13 is provided between the protrusions 14 and 20 formed on the sliding angle 15 and the fixed angle 18.
is attached to urge the sliding angle 15 in the direction of arrow D. On the other hand, the other end is fixed to a tension arm 22 rotatably attached to the chassis 17. This tension arm 22 consists of an arm body 22a and a relay arm 22b to which the band 11 is fixed, and the relay arm 22b is rotatably attached to the arm body 22a. Further, a spring 23 is attached to this arm body 22a, and the tension arm 22
is biased in the direction of arrow E.

During normal recording and reproduction, the supply reel 9 rotates in the direction of arrow F (forward direction), and the tension arm 22 is urged in the direction of arrow E by the elasticity of the spring 23. Further, the sliding angle 15 is slid in the direction of arrow D within the range of the elongated holes 12, 12 by the elasticity of the spring 13. Therefore, the brake felt 10 comes into contact with the reel stand 9 in the escape direction, and can obtain an appropriate braking force, and can apply an appropriate tension to the magnetic tape (not shown). Furthermore, when rotating the supply reel stand 9 in the direction of arrow G (reverse direction) during special playback, etc., the brake felt 10 contacts the reel stand 9 in the biting direction, but the sliding angle 15 Since it is slid in the direction of arrow H against the elasticity of the magnetic tape, it is possible to prevent excessive braking force from being applied to the reel stand 9, and to apply appropriate tension to the magnetic tape.

Therefore, the magnetic recording/reproducing apparatus in the above embodiment can apply stable tension to the magnetic tape regardless of the rotational direction of the reel stand 9.

(Effects) As described above, in the present invention, in a magnetic recording/reproducing device equipped with a tape tension control mechanism that stabilizes the tension of the magnetic tape during running, one end of the band to which the friction material that comes into contact with the reel stand is attached is It is provided to be slidable within a predetermined range and biased in one direction by an elastic material, and the other end is attached to an arm that moves according to the tape tension when the magnetic tape runs and brings the friction material into contact with the reel stand. By moving the arm according to the tape tension and bringing the friction material into contact with the reel stand to apply appropriate tension to the magnetic tape, excessive braking force is applied to the reel when the reel stand rotates in the opposite direction. You can prevent it from joining the table.

Therefore, the tension of the magnetic tape can be kept stable regardless of the direction of rotation of the reel stand.

[Brief explanation of drawings]

Figure 1 is a plan view of the main parts of the conventional device, Figure 2
The figure is a plan view of the main parts of the apparatus in one embodiment of the present invention, and FIG. 3 is an exploded perspective view of the main parts in one embodiment of the invention. 9... Supply reel stand, 10... Brake felt,
11...Tension band, 13...Spring, 2
2...Tension arm.

Claims (1)

[Scope of utility model registration request] In a magnetic recording and reproducing device equipped with a tape tension control mechanism that stabilizes the tension of the magnetic tape during running, one end of the band to which a friction material that comes into contact with the reel stand is attached is provided so as to be slidable within a predetermined range, and an elastic material is provided. The other end is attached to an arm that moves according to the tape tension when the magnetic tape runs, and brings the friction material into contact with the reel stand, and this arm is moved according to the tape tension to reduce the friction described above. A magnetic recording and reproducing device comprising a tape tension control mechanism which brings the material into contact with the reel stand and applies an appropriate tension to the magnetic tape.